What is a button cell battery?
A button cell battery, also known as a coin cell battery, is a small, disc-shaped battery commonly used in devices requiring low current and long shelf life, such as watches, remote controls, and medical devices.
Xiaowei New Energy is a leading provider of high-quality button cell batteries, ensuring reliable power solutions for a wide range of applications.
Types and Chemistries of Button Cell Batteries
Button cell batteries are available in various chemistries, each with its own unique characteristics. The most common types include:
- Lithium Button Cells (e.g., CR2032): Known for their high energy density, long shelf life, and stable voltage output. These are ideal for applications that require a consistent and reliable power source over extended periods.
- Silver Oxide Cells (e.g., SR621SW): These batteries offer a steady discharge rate and are particularly suitable for devices that need a stable and long-lasting power supply, such as watches and medical devices.
Key Features of Button Cell Batteries
Button cell batteries are designed to meet specific requirements, making them popular in various applications. Their key features include:
- Small Size: The compact and flat design allows these batteries to fit into small and thin devices without compromising on performance.
- Low Current Output: They are optimized for devices that require minimal current, such as watches, calculators, and hearing aids.
- Long Shelf Life: With a typical shelf life of 5-10 years, button cell batteries can be stored for long periods without significant loss of capacity.
Button Cell Batteries Machine
| Machine Name | Function | Application Scenario | Capacity | Reference Price |
|---|---|---|---|---|
| Dual Planetary Vacuum Mixer | Mix anode/cathode powder, binder and solvent uniformly under vacuum, remove air bubbles, prepare battery slurry | Electrode preparation for lithium/alkaline button cells | 50–200L batch; 1–3 batches/hour | $12,000–$45,000 |
| Slot-die Coating Machine | Coat slurry evenly on current collector foil with ultra-thin controlled thickness | Mass production of button cell electrode sheets | 5–30 m/min coating speed | $28,000–$85,000 |
| Calendering Machine | Press coated electrodes to target compactness, improve conductivity and density | Post-coating electrode compression | Max width 300mm | $15,000–$42,000 |
| Electrode Punching Machine | Precisely punch electrode discs to matched diameter (CR2032, CR2025 etc.) | Cut circular positive and negative electrode discs for coin cells | 30–120 pcs/min | $3,000–$12,000 |
| Vacuum Drying Oven | Remove residual solvent and moisture from punched electrodes; prevent battery swelling and side reactions | Electrode dehydration before assembly | 200–800 pcs per batch | $6,000–$22,000 |
| Electrolyte Injector | Accurately inject tiny fixed volume of electrolyte into button cell casing | Cell filling inside glove box (water & oxygen controlled environment) | 60–180 pcs/min | $8,000–$26,000 |
| Coin Cell Crimping / Sealing Machine | Precise pressure crimping to seal the cell cap and metal shell, guarantee airtightness | Core sealing station for button cell assembly | 20–100 pcs/min | $2,500–$18,000 |
| Formation & Aging Cabinet | Charge and discharge for cell formation, stabilize internal chemical performance, aging screening | Post-sealing activation and aging | 1000–5000 cells per rack | $9,000–$35,000 |
| OCV & IR Sorting Tester | Test open circuit voltage and internal resistance, sort qualified and defective cells | Final electrical grading before packaging | 80–200 pcs/min | $7,000–$24,000 |
| Leakage Testing Machine | Detect micro-leakage of sealed button cells to avoid electrolyte leakage | Hermetic quality inspection after crimping | 50–150 pcs/min | $5,000–$19,000 |
| Labeling & Packaging Machine | Print logo, stick labels and pack finished button cells into trays or blister packs | Final packaging for finished goods | 120–300 pcs/min | $6,500–$21,000 |
Common Applications of Button Cell Batteries
Button cell batteries are widely used in a variety of everyday and specialized devices. Some common applications include:
- Watches: Both digital and analog watches often use button cell batteries due to their small size and long-lasting power.
- Remote Controls: Many TV, garage door, and other electronic remote controls rely on button cell batteries for their operation.
- Sensors: Environmental sensors, security systems, and other IoT devices frequently use button cell batteries to provide reliable power.
- Medical Devices: Hearing aids, glucose monitors, and other small medical devices benefit from the consistent and long-lasting power provided by button cell batteries.
Comparison with Other Small Batteries
While button cell batteries are highly versatile, they have some differences compared to other small batteries like AAA or AA cells. Here’s a comparison:
Case Study: Xiaowei New Energy’s Button Cell Battery in Medical Devices
Xiaowei New Energy supplied a custom lithium button cell battery solution for a leading medical device manufacturer in Europe. The project involved providing a reliable power source for a new line of glucose monitoring devices. The key details of the case study are as follows:
| Item | Specification & Explanation |
|---|---|
| Common Types | 1. Lithium button cell (3V, CR series: CR2032, CR2025, CR2016). Most widely used.
2. Alkaline button cell (1.5V, LR series: LR44, LR41). Low-cost for small devices. 3. Silver oxide button cell (1.55V, SR series). Stable voltage, for precision watches. 4. Rechargeable lithium button cell (3.6V, LIR series). Reusable for wearables. |
| Nominal Voltage | CR lithium: 3.0V
Alkaline: 1.5V Silver oxide:1.55V LIR rechargeable:3.6V |
| Typical Applications | Watches, remote controls, car key fobs, hearing aids, electronic thermometers, wearable sensors, motherboards, small IoT devices. |
| Key Features | Small size, low self-discharge, compact packaging. Non-rechargeable button cells are primary batteries. Rechargeable LIR types support repeated charge cycles. |
| Main Production Process | Electrode mixing → coating → punching of positive/negative discs → stacking/crimp sealing → electrolyte injection → formation → aging → sorting & testing → packaging. Semi-automatic and fully automatic production lines available. |
| Safety Notes | Keep away from children; risk of ingestion hazard. Do not short-circuit, heat or disassemble. Different chemistries cannot be mixed in one device. |
| Cost Characteristics | Low unit price for single cell. Production line cost depends on automation level. Mass production greatly reduces per-unit manufacturing expense. |
FAQs about Button Cell Batteries
Button cell batteries and coin cell batteries are essentially the same, with both terms referring to small, disc-shaped batteries. The terms are often used interchangeably. These batteries are characterized by their flat, circular shape and are commonly used in devices that require a compact and reliable power source.
Button cell batteries typically have a shelf life of 5-10 years. However, the actual operational life depends on the specific application and the current draw of the device. Devices with low current requirements, such as watches and remote controls, can operate for several years on a single button cell battery.
In many cases, you can replace a silver oxide button cell with a lithium button cell, but it is important to check the device specifications. While both types of batteries have similar dimensions, they differ in voltage and discharge characteristics. Always refer to the device manual or consult the manufacturer to ensure compatibility.
Button cell batteries are generally safe to use, but they should be handled with care, especially around children and pets. Swallowing a button cell battery can be extremely dangerous and requires immediate medical attention. It is important to store and dispose of these batteries properly to prevent accidental ingestion.
Button cell batteries, particularly those containing lithium, should be disposed of properly to minimize environmental impact. Many regions have recycling programs for batteries, and it is recommended to follow local guidelines for disposal. Additionally, using rechargeable batteries where possible can help reduce waste.
| Question and Answer |
|---|
| Q: What is a button cell battery?
A: Button cell batteries are small, round, coin-shaped disposable or rechargeable batteries, also called coin cells, commonly used for low-current small electronics. |
| Q: What are common types of button cell batteries?
A: Main types include lithium coin cells (CR series), silver oxide cells (SR series), alkaline button cells (LR series), and rechargeable lithium button cells (ML/LIR). |
| Q: What is the typical voltage of CR2032 button cell?
A: CR2032 lithium coin cell has a nominal voltage of 3.0V. |
| Q: What are button cell batteries used for?
A: Watches, computer motherboards, remote controls, car key fobs, hearing aids, small sensors, calculators and medical wearable devices. |
| Q: What is the difference between disposable and rechargeable button cells?
A: Disposable coin cells cannot be recharged; rechargeable LIR/ML button cells can be cycled but have lower capacity and higher cost. |
| Q: How long can a CR2032 button cell last in a device?
A: It depends on power consumption. For motherboards or watches, it can work 2–5 years; for frequent-use sensors, it may last only several months. |
| Q: Are button cell batteries dangerous?
A: Yes. If swallowed, especially by children, they can cause severe internal burns. Short circuit may also lead to overheating or leakage. |
| Q: Can I use a silver oxide button cell to replace alkaline LR cell?
A: Silver oxide cells deliver stable voltage and higher capacity, suitable for precision devices like watches. Check size and voltage before replacement. |
| Q: What does the number on button cell model mean?
A: The first two digits mean diameter in mm, the last two digits represent thickness. CR2032 is 20mm diameter, 3.2mm thick. |
| Q: How should I store unused button cells?
A: Keep them in dry, room-temperature environment. Avoid mixing loose batteries to prevent short circuits, and keep away from young kids. |
Conclusion
Button cell batteries, or coin cell batteries, are essential components in a wide range of devices, from watches and remote controls to medical devices and sensors. Their small size, low current output, and long shelf life make them a reliable choice for applications requiring a compact and consistent power source. Understanding the different chemistries, features, and proper handling of button cell batteries is crucial for ensuring optimal performance and safety.
