Real Case & Full Cost Analysis of Semi-Automatic Prismatic Lithium Battery Production Line | Xiaowei New Energy
Abstract
Prismatic lithium batteries are the mainstream core products for new energy passenger vehicles, commercial vehicles, household energy storage, industrial backup power and low-speed electric vehicles. Compared with cylindrical batteries, prismatic cells feature higher energy density, better structural stability, stronger safety performance and more flexible packaging adaptation, occupying more than 65% of the global power battery market share. Different from fully automatic production lines suitable for GWh-level large-scale factories, semi-automatic prismatic lithium battery production lines have become the preferred solution for medium and small-sized battery manufacturers, new entrants and pilot production enterprises by virtue of low initial investment, flexible production switching, low site requirement and short commissioning cycle.
Most small and medium-sized battery project investors in the market have cognitive deviations: they simply equate semi-automatic lines with low efficiency and low yield, and ignore the core advantages of semi-automatic prismatic lines in phased investment, flexible order response, low energy consumption and low operation threshold. Based on a real 1GWh semi-automatic LFP prismatic battery turnkey project delivered by Xiaowei New Energy for a domestic new energy factory, this paper conducts a full-dimensional in-depth analysis, covering project overall positioning, full-process equipment configuration and performance analysis, factory civil engineering and clean room construction, full-caliber CAPEX and OPEX data measurement, capacity yield analysis, operation bottleneck and cost optimization strategies.
This case focuses on the differentiated characteristics of semi-automatic prismatic production lines, quantifies the cost gap with fully automatic lines, sorts out the applicable market scenarios, and summarizes the whole life cycle operation experience. The full text is supported by detailed data tables and professional industry analysis, which can provide accurate investment reference and construction guidance for global prismatic battery semi-automatic factory project investors.
Keywords: Semi-automatic production line; Prismatic lithium battery; LFP cell; CAPEX; OPEX; Factory construction; Cost optimization; Xiaowei New Energy
1. Introduction
With the iterative upgrading of new energy vehicle power battery and energy storage battery technology, prismatic lithium batteries, especially LFP prismatic cells, have become the absolute mainstream of the market relying on ultra-long cycle life, high safety and low material cost. At present, large-scale head battery enterprises generally adopt fully automatic production lines with annual capacity of more than 5GWh, realizing large-scale centralized production. However, for niche market manufacturers, supporting auxiliary battery factories and new project pilot mass production scenarios, fully automatic lines have prominent disadvantages such as excessive initial investment, long construction cycle, inflexible product switching and high operation and maintenance costs.
Semi-automatic prismatic lithium battery production lines adopt the production mode of key process full automation + auxiliary process manual auxiliary positioning and transmission. The core key links such as electrode coating, rolling, slitting, core stacking, laser welding, liquid injection, formation and sorting are all completed by high-precision automatic equipment, while the low-precision, high-frequency and low-risk material handling, loading and unloading, and tooling switching links are assisted by manpower. This mode effectively balances production cost, production flexibility and product consistency, and is highly compatible with the production demand of multi-specification, small-batch and customized prismatic cells.
Xiaowei New Energy has long been committed to the turnkey solution service of prismatic lithium battery production lines, covering full-automatic large-scale lines and semi-automatic medium and small-scale lines. Different from the standardized configuration of full-automatic lines, the semi-automatic prismatic line independently designed and integrated by the company can realize personalized configuration according to customer capacity budget, plant area, product specification and order characteristics, and maximize the cost performance of the project on the premise of ensuring product qualification rate and production stability.
This paper takes the domestic 1GWh semi-automatic LFP prismatic battery mass production line project successfully delivered and put into operation by Xiaowei New Energy in 2025 as the research object, comprehensively analyzes the whole process of project construction, equipment matching, factory transformation, capital investment and daily operation, quantifies all cost indicators and production performance data, and deeply analyzes the core advantages, existing bottlenecks and subsequent optimization paths of semi-automatic prismatic production lines, providing practical and operable industry cases for similar projects.
2. Core Process and Cost Composition of Semi-Automatic Prismatic Battery Production Line
2.1 Full Production Process of Prismatic Lithium Battery
The production process of prismatic lithium batteries is divided into three core sections: front-end electrode manufacturing, middle-end cell core assembly and drying room manufacturing, and back-end formation aging and finished product sorting. The overall process is consistent with the full-automatic line, but the automation degree of material transmission, tooling switching and offline detection links is reduced, and manual auxiliary operation is added appropriately.
Front-end electrode manufacturing process: Raw material feeding → Automatic slurry vacuum stirring → Automatic slot die coating → Multi-stage continuous drying → Precision calendering → Automatic slitting → Manual electrode inspection and trimming → Electrode vacuum baking and moisture removal. The core processes of coating, calendering and slitting are fully automated to ensure electrode thickness and size consistency, and the defective electrode sorting and trimming links are manually assisted to reduce equipment investment.
Middle-end core assembly & dry room process: Manual electrode sorting and feeding → Automatic high-speed lamination → Manual core shaping and inspection → Automatic shell feeding and assembly → Automatic top sealing and laser welding → Multi-stage vacuum baking → Automatic vacuum liquid injection → Standing infiltration → Automatic helium leak detection. All key processes affecting cell safety and performance such as lamination, welding and liquid injection are fully automated, and the single core handling and shaping links are manually operated to improve production flexibility.
Back-end formation & sorting process: Automatic cell loading → Multi-channel independent formation → Constant temperature aging → Automatic OCV/ACIR testing → Manual secondary screening of suspicious defective products → Automatic heat shrink packaging → Laser marking → Finished product manual packaging and warehousing. The electrical performance testing links are fully automated to ensure detection accuracy, and the secondary screening and warehousing links are manually assisted to reduce equipment configuration costs.
2.2 Core Differences Between Semi-Automatic and Fully Automatic Prismatic Lines
In order to clarify the positioning advantages of semi-automatic lines, this paper sorts out the core differences between semi-automatic and fully automatic prismatic battery production lines in terms of automation rate, investment cost, production flexibility and applicable scenarios, as shown in Table 1.
|
Comparison Dimension
|
Semi-Automatic Prismatic Line
|
Fully Automatic Prismatic Line
|
|---|---|---|
|
Overall Automation Rate
|
76%-83%
|
96%-99.9%
|
|
Unit GWh CAPEX
|
120-160 Million CNY
|
200-280 Million CNY
|
|
Construction Cycle
|
6-9 months
|
10-14 months
|
|
Production Flexibility
|
High, support rapid switching of multiple specifications
|
Low, fixed specification mass production
|
|
Labor Demand
|
Moderate, mainly auxiliary operation
|
Few, only equipment maintenance personnel
|
|
Energy Consumption per Wh
|
Low, no large-scale AGV and intelligent logistics energy consumption
|
High, continuous operation of supporting intelligent systems
|
|
Applicable Scenarios
|
Small-batch, multi-specification, pilot production, niche market
|
Large-batch, single-specification, mass production
|
Table 1 Core Differences Between Semi-Automatic and Fully Automatic Prismatic Battery Production Lines
2.3 Full-Caliber Project Cost Composition Definition
The total investment of semi-automatic prismatic lithium battery production project is consistent with the standard industrial investment system, divided into fixed asset investment (CAPEX) and initial working capital; the daily operation cost is operating expenditure (OPEX). Different from fully automatic lines, semi-automatic lines have significantly reduced investment in intelligent logistics, automatic loading and unloading equipment, and high-end MES full intelligent control system, and the proportion of manual auxiliary cost in OPEX increases moderately.
CAPEX Scope: Core production equipment, clean and dry room construction, HVAC constant temperature and humidity system, power distribution engineering, waste gas and wastewater treatment system, factory renovation and fire protection engineering, equipment installation and commissioning, project design and technical training, basic laboratory testing equipment.
OPEX Scope: Raw material procurement cost, workshop electricity and gas energy consumption cost, staff salary and welfare, equipment maintenance and consumable replacement, factory daily operation and environmental protection handling, quality inspection and testing cost, management and logistics overhead.
Working Capital: Raw material inventory reserve, finished product inventory, spare parts inventory, daily operation fund reserve.
3. Real Project Case: 1GWh Semi-Automatic LFP Prismatic Battery Production Line (China)
3.1 Project Basic Overview
This project is a medium-sized new energy battery manufacturing project in central China, a turnkey project fully designed, integrated and commissioned by Xiaowei New Energy. The project is positioned in the production of square LFP power batteries and energy storage batteries, which are mainly used in low-speed electric vehicles, household energy storage systems, industrial backup power and light commercial vehicle power batteries. The project adopts a semi-automatic production mode, balancing investment cost, production capacity and product flexibility, and is a typical benchmark project for small and medium-sized prismatic battery factories.
The project is constructed in one phase, with a designed annual capacity of 1GWh. It adopts a 3-shift production system, 300 working days a year. The mainstream product specification is 3.2V 50Ah/100Ah LFP prismatic cells, which can flexibly switch production of 30Ah-120Ah different specifications of prismatic cells through manual tooling adjustment and parameter modification, meeting the customized order needs of different customers.
Compared with the fully automatic line, the project cancels the full-process AGV intelligent logistics system and automatic loading and unloading manipulator, retains all core process automatic equipment, and realizes flexible production through manual auxiliary docking. The project has the advantages of low initial investment, short construction cycle, low operation threshold and strong market adaptability.
The basic project parameters are shown in Table 2:
|
Parameter Item
|
Specific Data
|
|---|---|
|
Battery Type
|
LFP Prismatic Lithium Battery
|
|
Designed Annual Production Capacity
|
1GWh
|
|
Main Product Specifications
|
3.2V 50Ah / 100Ah (flexible switching 31-120Ah)
|
|
Production Operation Mode
|
3 shifts, 300 working days/year
|
|
Overall Line Automation Rate
|
79%
|
|
Target Finished Product Yield
|
97.6%
|
|
Total Factory Floor Area
|
8,600 ㎡
|
|
Clean & Dry Room Area
|
4,100 ㎡
|
|
Dry Room Dew Point Standard
|
≤ -40℃
|
|
Project Construction Cycle
|
6-7 months (design to mass production)
|
|
Total On-the-job Staff
|
100-126 people
|
Table 2 Basic Parameters of 1GWh Semi-Automatic Prismatic Battery Project
Image 1: Overall layout of semi-automatic prismatic lithium battery production workshop (front electrode workshop + middle dry room assembly workshop + back-end formation sorting workshop)
3.2 Full-Set Equipment Investment & Performance Analysis
The semi-automatic prismatic line equipment integrated by Xiaowei New Energy is divided into four modules: front-end electrode manufacturing equipment, middle-end dry room assembly equipment, back-end formation and sorting equipment, and auxiliary testing and safety equipment. All core process equipment adopts high-precision automatic configuration, and only the material transmission and auxiliary handling links retain manual operation space, which ensures production accuracy and reduces equipment investment cost.
Different from the fully automatic line, this project eliminates expensive full-process intelligent logistics equipment and multi-station automatic manipulator loading and unloading system, and optimizes the MES system to a lightweight data monitoring version, which greatly reduces the equipment CAPEX on the premise of meeting mass production needs. The detailed equipment investment breakdown is shown in Table 3:
|
Process Section
|
Core Equipment Configuration
|
Investment (CNY)
|
Equipment Proportion
|
|---|---|---|---|
|
Front-end Electrode Manufacturing
|
Vacuum slurry mixing system, slot-die coating machine, continuous drying line, precision calender, high-speed slitter, electrode vacuum baking oven
|
52,600,000
|
42.15%
|
|
Middle-end Dry Room Assembly
|
High-speed lamination machine, automatic shell assembling machine, top laser welding machine, multi-stage vacuum baking equipment, vacuum liquid injection machine, helium leak detector
|
46,600,000
|
37.34%
|
|
Back-end Formation & Sorting
|
Multi-channel formation cabinet, constant temperature aging room, OCV/ACIR automatic testing sorter, heat shrink packaging machine, laser marking machine
|
18,500,000
|
14.82%
|
|
Auxiliary & Testing System
|
Lightweight MES monitoring system, workshop safety testing equipment, laboratory basic testing instruments, offline inspection tooling
|
7,100,000
|
5.69%
|
|
Total Equipment Investment
|
Full Line Equipment Configuration
|
124,800,000
|
100%
|
Table 3 1GWh Semi-Automatic Prismatic Line Equipment CAPEX Breakdown
3.2.1 Key Equipment Performance & Technical Advantage Analysis
Front-end electrode core equipment: The slurry mixing system adopts full vacuum stirring and automatic feeding technology to ensure the uniformity of electrode slurry and avoid particle agglomeration; the slot-die coating machine adopts closed-loop thickness detection, with electrode thickness deviation controlled within ±1μm, which effectively guarantees the consistency of cell capacity and internal resistance; the calendering and slitting equipment adopts high-precision transmission structure, with no burr on the electrode edge, eliminating the risk of cell internal short circuit caused by electrode burrs. The front-end process fully automates the core production links, and only the electrode trimming and sorting are manually assisted, which not only ensures process accuracy, but also reduces redundant equipment investment.
Middle-end assembly core equipment: The high-speed lamination machine is the core equipment of prismatic cell production, with stable lamination speed and accurate alignment, effectively avoiding lamination deviation and diaphragm wrinkling defects; the laser welding equipment adopts fixed-point automatic welding, with beautiful welding seam and high firmness, and 100% real-time monitoring of welding quality; the vacuum liquid injection system adopts secondary vacuum pumping and segmented liquid injection technology, which ensures full infiltration of electrolyte and improves cell cycle life. The dry room core process is fully automated, and the manual work is only limited to single cell handling and tooling replacement, which greatly improves the flexibility of multi-specification production.
Back-end testing equipment: The formation cabinet supports independent CC/CV charge and discharge control of each channel, with precise current and voltage control, which can adapt to the formation process parameters of different specifications of LFP cells; the automatic sorting system accurately screens cells according to capacity, internal resistance and voltage parameters, with a screening accuracy rate of 100%. The back-end testing and sorting links are fully automated to eliminate human detection errors, and the finished product packaging links are manually assisted to reduce equipment costs.
3.3 Factory Civil Engineering & Supporting System Investment Analysis
The factory investment of semi-automatic prismatic line is mainly composed of clean and dry room construction, constant temperature and humidity HVAC system, power distribution engineering, environmental protection treatment system, workshop renovation and fire protection engineering. Compared with the fully automatic line, the semi-automatic line has lower requirements for workshop intelligent transformation, no need for large-scale intelligent logistics supporting facilities, and the civil engineering investment is significantly reduced. The detailed civil engineering CAPEX breakdown is shown in Table 4:
|
Engineering Item
|
Investment (CNY)
|
Project Description
|
|---|---|---|
|
Clean & Dry Room Enclosure & Decoration
|
36,860,000
|
4200㎡ clean and dry room partition, anti-static floor, dust-proof ceiling
|
|
Low Dew Point Dehumidification & HVAC System
|
28,550,000
|
Dew point ≤-40℃ constant humidity system, workshop constant temperature control equipment
|
|
Power Transformation & Distribution Engineering
|
15,250,000
|
Special transformer for battery workshop, high and low voltage distribution cabinet, line transformation
|
|
Environmental Protection Treatment System
|
9,650,000
|
Coating waste gas recovery, workshop wastewater treatment, solid waste disposal system
|
|
Fire Protection & Workshop Renovation
|
6,360,000
|
Explosion-proof transformation, fire protection facility deployment, workshop safety transformation
|
|
Subtotal Civil Engineering Investment
|
96,460,000
|
|
|
Project Design, Installation & Commissioning
|
18,250,000
|
Scheme design, equipment installation, on-site commissioning, staff technical training
|
Table 4 Factory Civil Engineering & Supporting System CAPEX Breakdown
3.3.1 Total Project CAPEX & Overall Investment Accounting
Total fixed asset investment (CAPEX) = Equipment investment + Civil engineering investment + Design and commissioning cost
CAPEX = 124.9M + 96.4M + 18.2M = 239.5 Million CNY
Initial working capital (raw material inventory, spare parts reserve, daily operation fund) = 68.8 Million CNY
Total Project Overall Investment = 308.3 Million CNY
Unit GWh comprehensive investment = 308.3 Million CNY/GWh, which is 40%-45% lower than the fully automatic prismatic line of the same capacity, showing extremely high cost performance in small and medium-sized capacity projects.
3.4 Full-Dimension OPEX Operation Cost Data Analysis
After the project is put into stable mass production, the annual operating cost mainly includes raw material cost, energy consumption cost, labor cost, equipment maintenance cost, workshop operation and management overhead. Different from the fully automatic line, the semi-automatic line has higher labor cost ratio, but significantly lower energy consumption and intelligent equipment maintenance cost. The detailed annual OPEX breakdown and unit Wh cost accounting are shown in Table 5:
|
OPEX Cost Item
|
Annual Expense (CNY)
|
Cost per Wh (CNY)
|
Cost Proportion
|
|---|---|---|---|
|
Battery Raw Materials
|
292,800,000
|
0.2928
|
83.1%
|
|
Workshop Energy Consumption
|
28,600,000
|
0.0286
|
8.1%
|
|
Staff Labor Cost
|
18,900,000
|
0.0189
|
5.4%
|
|
Equipment Maintenance & Consumables
|
7,800,000
|
0.0078
|
2.2%
|
|
Operation & Quality Overhead
|
4,200,000
|
0.0042
|
1.2%
|
|
Total Annual OPEX
|
352,300,000
|
0.3523
|
100%
|
Table 5 Annual OPEX & Unit Manufacturing Cost Analysis
3.4.1 Core Operation Performance Data
Capacity Utilization Rate: The actual stable annual output of the project is 920MWh, and the long-term average capacity utilization rate is 92%, which is higher than the average utilization rate of small and medium-sized fully automatic lines (85%). The semi-automatic line has low fixed cost pressure and flexible order adjustment, so it can maintain high-capacity operation under small-batch customized orders.
Product Yield: The comprehensive finished product yield of the project is stable at 97.6%, which is only 0.5%-1% lower than that of the fully automatic line. The core process full automation ensures product consistency, and the manual auxiliary sorting effectively screens defective products in advance, avoiding batch defective outflow.
Comprehensive Unit Cost: The annual fixed asset depreciation is 23.95M CNY (10-year depreciation cycle), and the comprehensive unit cost including depreciation is 0.378 CNY/Wh.
Profit Return Cycle: Under the condition of stable 92% capacity utilization and mainstream market cell gross profit margin, the static investment payback period of the project is 3.2 years, which is significantly shorter than the 4-5 years of the fully automatic line of the same capacity.
3.5 Process Yield Loss & Defect Analysis
In view of the semi-automatic production mode, this paper conducts a quantitative statistical analysis of the yield loss rate of each process link, clarifies the defective distribution rules, and provides targeted optimization directions for subsequent production. The detailed yield loss data is shown in Table 6:
|
Production Process Link
|
Yield Loss Rate
|
Main Defect Types
|
Defect Causes Analysis
|
|---|---|---|---|
|
Front-end Electrode Manufacturing
|
1.2%
|
Coating deviation, electrode surface particle defect
|
Slurry mixing uniformity deviation, equipment parameter fine-tuning error
|
|
Middle-end Lamination & Welding
|
0.8%
|
Lamination deviation, welding virtual welding
|
Manual feeding positioning deviation, equipment parameter fluctuation
|
|
Liquid Injection & Sealing
|
0.3%
|
Liquid injection volume deviation, slight air leakage
|
Dry room micro humidity fluctuation
|
|
Formation & Sorting
|
0.1%
|
Capacity and internal resistance out of tolerance
|
Individual cell process difference
|
|
Comprehensive Total Yield Loss
|
2.4%
|
Comprehensive defective rate
|
Consistent with industry semi-automatic line standard
|
Table 6 Process Yield Loss & Defect Statistical Analysis
Image 2: Semi-automatic prismatic battery lamination and welding production scene (dry room core process fully automatic operation)
3.6 Project Core Advantages & Operational Bottlenecks
3.6.1 Project Core Advantages
1. Ultra-low initial investment and low risk: The total investment of the 1GWh project is only 308.3 million CNY, which saves more than 40% of the capital cost compared with the fully automatic line. The phased investment mode can be adopted, and subsequent automation equipment can be added according to the order volume growth, realizing gradual capacity expansion and avoiding idle investment caused by overcapacity.
2. Strong production flexibility and wide market adaptation: Relying on manual auxiliary tooling switching and parameter adjustment, the line can quickly switch cell specifications, meet small-batch, multi-variety customized order production, and solve the problem of single product and poor flexibility of fully automatic fixed lines.
3. Low operation energy consumption and low daily cost: Without large-scale AGV logistics system and full intelligent operation equipment, the overall power consumption of the workshop is reduced by 25%-30% compared with the fully automatic line of the same capacity, and the equipment maintenance cost is lower, with more prominent long-term operation cost advantages.
4. Short construction cycle and fast return on investment: The project construction cycle is only 7 months, which is nearly half of the fully automatic line. It can quickly complete production capacity construction and put into market operation, shorten the capital occupation cycle and accelerate investment recovery.
3.6.2 Project Operational Bottlenecks
1. Manual operation brings slight yield fluctuation: The manual feeding and handling links have individual operation errors, resulting in slightly higher yield loss rate than fully automatic lines, and the production consistency of ultra-large batch products is slightly insufficient.
2. Higher dependence on skilled workers: The auxiliary operation links need professional skilled workers for cooperation, and the production efficiency will be affected by worker proficiency and personnel mobility.
3. Limited ultra-high capacity expansion potential: It is suitable for medium and small batch production. If it is upgraded to 5GWh large-scale mass production in the later stage, it needs to add automatic logistics and loading and unloading equipment for secondary transformation.
4. Comparative Analysis of Semi-Automatic vs Fully Automatic Prismatic Line Economic Benefits
In order to further clarify the application value of semi-automatic prismatic production lines, this paper selects the mainstream 1GWh fully automatic prismatic line in the market for horizontal comparison, focusing on investment cost, operation efficiency, economic benefit and other core indicators, as shown in Table 7:
|
Core Economic Index
|
1GWh Semi-Automatic Line (This Case)
|
1GWh Fully Automatic Line (Industry Standard)
|
|---|---|---|
|
Total Project Investment
|
308.3M CNY
|
520-550M CNY
|
|
Construction Cycle
|
7 months
|
12 months
|
|
Line Automation Rate
|
78%
|
97%
|
|
Comprehensive Yield
|
97.6%
|
98.5%
|
|
Annual Energy Consumption Cost
|
28.6M CNY
|
39.2M CNY
|
|
Annual Labor Cost
|
18.9M CNY
|
9.6M CNY
|
|
Comprehensive Unit Cost
|
0.378 CNY/Wh
|
0.365 CNY/Wh
|
|
Capacity Utilization Rate
|
92%
|
85%
|
|
Static Payback Period
|
3.2 years
|
4.1 years
|
|
Production Flexibility
|
High (multi-specification switching)
|
Low (fixed specification)
|
Table 7 Economic Benefit Comparison of Semi-Automatic and Fully Automatic Prismatic Lines
Through comparative analysis, it can be seen that although the semi-automatic line has a slight gap in yield and single unit cost with the fully automatic line, it has obvious advantages in total investment, construction cycle, capacity utilization rate and investment return cycle. For small and medium-sized projects with uncertain orders, multi-specification production and limited initial funds, the comprehensive economic benefit of semi-automatic lines is far better than that of fully automatic lines.
5. Whole Life Cycle Cost Optimization Strategy for Semi-Automatic Prismatic Production Line
Based on the actual operation data and project experience of this 1GWh semi-automatic prismatic line project, Xiaowei New Energy summarizes a set of targeted cost optimization schemes for semi-automatic lines, aiming at the characteristics of moderate automation, manual auxiliary participation and flexible production, to help enterprises further reduce production costs and improve profit margins.
5.1 Equipment Configuration Optimization
Adopt phased equipment configuration, retain automatic equipment upgrading and expansion interface in the initial stage, do not blindly configure redundant intelligent equipment, and reduce initial CAPEX investment. For low-frequency, low-precision and high-manual matching links, maintain semi-automatic configuration; for core process links affecting cell performance and yield, ensure full-automatic high-precision equipment configuration to balance cost and quality.
5.2 Personnel Operation Standardization Optimization
Formulate standardized operation SOP manuals for manual auxiliary links, carry out unified pre-job training for employees, reduce operation errors caused by unstandardized manual operation, and stabilize product yield. Set up special post assessment mechanism, improve worker proficiency, and increase daily production efficiency by 8%-12% on the premise of ensuring quality.
5.3 Dry Room Energy Consumption Optimization
Aiming at the high energy consumption problem of dry room operation, adopt zoning temperature and humidity control and peak-shifting power consumption mode. Set low-energy standby mode for non-production time periods, optimize dehumidifier air circulation and heat recovery system, reduce dry room comprehensive energy consumption by 10%-15%, and greatly reduce annual electricity cost.
5.4 Production Plan & Inventory Optimization
Combined with the flexible production characteristics of semi-automatic lines, formulate refined production plans according to customer orders, realize small-batch and multi-batch rolling production, avoid excessive raw material inventory occupation, and reduce working capital pressure. Use lightweight MES system to monitor production data in real time, timely find process abnormalities, and reduce defective product loss.
5.5 Phased Automation Upgrading
According to the later order growth and capacity expansion demand, gradually add automatic loading and unloading manipulator, small AGV logistics system and automatic sorting equipment, realize semi-automatic to high-automatic line upgrading, avoid one-time large investment risk, and realize gradual iteration of production capacity and efficiency.
6. Project Risk Assessment & Industry Application Scenario Summary
6.1 Core Project Risk Assessment
Technical Risk: The manual auxiliary operation link has certain human error risk, which may cause individual product defects. The solution is to strengthen staff training and process inspection, and realize double guarantee of automatic equipment detection + manual recheck.
Market Risk: The prismatic battery market competition is fierce, and product price fluctuation affects profit level. The semi-automatic line relies on flexible multi-specification production ability, which can quickly adapt to market demand changes and avoid single product market risk.
Operation Risk: Staff mobility may affect production efficiency. Establish a perfect talent training and incentive mechanism, reserve professional technical workers, and ensure stable production operation.
Policy Risk: Environmental protection and safety supervision standards are continuously upgraded. The project is constructed in strict accordance with national industry standards, with complete environmental protection and safety supporting facilities, meeting long-term policy compliance requirements.
6.2 Applicable Scenarios of Semi-Automatic Prismatic Production Line
Combined with this real case, the semi-automatic prismatic lithium battery production line is most suitable for the following market scenarios: First, new energy battery enterprises with limited initial investment funds and phased capacity expansion plans; Second, manufacturers focusing on niche markets, customized orders and small-batch multi-variety production; Third, battery project pilot production, new product process verification and test mass production; Fourth, regional small and medium-sized energy storage battery and supporting Power Battery supporting factories.
7.Semi-Automatic Prismatic Lithium Battery Production Line — Equipment List (
Xiaowei New Energy )
Line type: Semi-auto pilot / small-batch line for LFP & NCM prismatic cells (50–280Ah). Core processes automated; material loading, transfer and some inspection done manually.
1. Electrode Manufacturing Section
| Equipment | Core Function | Throughput / Capacity | Semi-Auto Notes |
|---|---|---|---|
| Automatic Powder Feeding System | Feed & convey cathode/anode powder | 150–400 kg/h | Manual batch dosing |
| Vacuum Planetary Mixer | Mix active material, binder & conductive agent into slurry | 50–200 L/batch | Single or double planetary mixer |
| Slurry Transfer & Filtration System | Slurry storage, transfer & impurity filtration | Match mixer output | Manual container transfer |
| Slot Die Coating Machine | Coat slurry onto copper/aluminum foil | 3–15 m/min | Semi-auto tension control, manual roll change |
| Electrode Drying Oven | Remove solvent from coated electrode | Match coater speed | Hot air / IR drying |
| Roll Press (Calendering) | Compress electrode to target compact density | 3–15 m/min | Manual feeding & thickness check |
| Electrode Slitting / Die Cutting Machine | Slit electrode into strips or die-cut prismatic sheets | 5–20 m/min | Semi-auto slitting, manual trimming |
| Vacuum Electrode Baking Oven | Remove residual moisture from electrodes | 80–250 kg/batch | Batch operation |
2. Cell Stacking & Shell Assembly Section
| Equipment | Core Function | Throughput / Capacity | Semi-Auto Notes |
|---|---|---|---|
| Electrode Sheet Stacking Machine | Stack cathode / separator / anode into jelly stack | 4–8 ppm | Semi-auto stacking, manual alignment check |
| Stack Hot Pressing Machine | Hot press stacked core to fix thickness & alignment | Match stacker speed | Manual loading/unloading |
| Stack CCD Inspection Machine | Check stacking offset, foreign matter, separator damage | 5–10 ppm | Operator-assisted inspection |
| Tab Ultrasonic Welding Machine | Weld electrode tabs (ultrasonic) | 5–10 ppm | Manual core positioning |
| Shell Loading & Cleaning Machine | Load aluminum shell, remove dust & impurity | 5–10 ppm | Semi-auto shell loading |
| Stack Inserting Machine | Insert jelly stack into prismatic aluminum can | 4–8 ppm | Manual core handling |
| Laser Bottom Welding Machine | Seal bottom of aluminum shell by laser welding | 3–6 ppm | Semi-auto clamping & laser welding |
| Vacuum Baking Oven | Remove moisture inside assembled cell | 150–400 cells/batch | Batch vacuum baking |
3. Electrolyte Filling & Sealing Section
| Equipment | Core Function | Throughput / Capacity | Semi-Auto Notes |
|---|---|---|---|
| Electrolyte Injection Machine | Precision electrolyte dosing into cell | 4–8 ppm | Semi-auto injection, manual tray handling |
| Vacuum Soaking Machine | Vacuum standing for electrolyte infiltration | 800–2,000 cells/h | Batch vacuum standing |
| Top Laser Sealing Machine | Laser seal cell top cover | 3–6 ppm | Manual cell feeding & positioning |
| Leak Detection Machine | Helium / air leak test of welded shell | 4–8 ppm | Semi-auto leak test |
4. Formation, Aging & Grading Section
| Equipment | Core Function | Throughput / Capacity | Semi-Auto Notes |
|---|---|---|---|
| Formation & Charge-Discharge Test System | First charging, activation & capacity test | 128–512 channels | Semi-auto fixture connection |
| Aging Cabinet | Room / high-temperature aging stabilization | 2,000–8,000 cells/cabinet | Batch aging |
| OCV & IR Sorting Machine | Sort cells by open circuit voltage & internal resistance | 800–2,000 cells/h | Semi-auto feeding |
| Capacity Grading Machine | Grade cells by actual discharge capacity | 600–1,500 cells/h | Manual grading data recording |
| Cell Appearance Inspection Machine | Visual defect inspection of finished bare cells | 5–10 ppm | Operator visual check + CCD assist |
5. Line Summary (Semi-Auto Prismatic)
| Item | Value |
|---|---|
| Applicable cell types | LFP / NCM prismatic, 50–280Ah |
| Annual capacity | 5–20 MWh |
| Investment range (FOB China, USD) | $280,000 – $850,000 |
| Excluded items | Cleanroom, dry room, HVAC, factory civil works |
| Typical users | R&D labs, small-batch trial production, custom cell orders |
8. Conclusion
Based on the real 1GWh semi-automatic LFP prismatic battery turnkey project delivered by Xiaowei New Energy, this paper systematically completes the full-dimensional analysis of process flow, equipment configuration, factory construction, CAPEX/OPEX cost, production performance and economic benefits. The case data fully verifies that the semi-automatic prismatic lithium battery production line has irreplaceable core advantages in small and medium-sized battery projects.
Different from the inherent cognition that semi-automatic lines have low efficiency and poor quality in the industry, the standardized semi-automatic line designed and integrated by Xiaowei New Energy retains the full-automatic configuration of all core process links that determine cell performance and safety, and only optimizes and simplifies the low-risk auxiliary handling links. The comprehensive product yield reaches 97.6%, which is very close to the fully automatic line, while the total project investment is saved by more than 40%, the construction cycle is shortened by nearly half, and the investment payback period is significantly advanced.
In terms of economic operation, although the semi-automatic line has slightly higher labor cost, it has obvious advantages in energy consumption cost, equipment maintenance cost and capital occupation. It can maintain a high capacity utilization rate in small-batch customized order scenarios, and the comprehensive long-term economic benefit is better than that of fully automatic lines. In addition, the semi-automatic line supports phased investment and phased automation upgrading, which can effectively avoid the investment risk of overcapacity and has extremely high market flexibility and risk resistance.
With the increasingly segmented global lithium battery market and the rising demand for customized small-batch batteries, semi-automatic prismatic lithium battery production lines will become the mainstream choice for medium and small-sized battery factories and new project entry. Xiaowei New Energy will continue to rely on rich project delivery experience, provide customized semi-automatic and fully automatic prismatic battery production line turnkey solutions for global customers, optimize project cost structure and production efficiency in a targeted manner, and help customers maximize project investment returns.
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