Providing high-quality battery jelly roll required by lithium battery manufacturers
We are the world’s leading manufacturer of lithium battery production equipment. Years of industry experience have made us well aware of the importance of battery jelly roll quality, which is crucial to the electrochemical performance and safety performance of lithium batteries: In our company, we have the ability and experience to customize and produce battery jelly rolls according to your needs, suitable for various types of batteries, including digital product lithium batteries and electric vehicle batteries.
Customizable battery jelly rolls
We use high-quality winding machines to make battery jelly rolls. By changing the shape of the winding needle, winding parameters and other factors, we can meet the production requirements of different batteries and realize the high-speed production of battery cores.
The customization of battery core involves many aspects:
1.Dimension design: Including the height, width, thickness and other external dimensions of the battery cell, as well as the design of detailed dimensions such as the width and position of the tape and the position of the tabs.
2.Internal structure design: Involving the relative position and size design of the positive electrode, negative electrode and diaphragm. For example, the negative electrode needs to completely wrap the positive electrode with a margin, and the diaphragm needs to wrap the negative electrode to ensure battery performance and safety.
3.Pole sheet specification design: Including the cutting position, interval size, coating specifications, etc. of the pole sheet, which directly affect the formation of the battery jelly rolls.
4.Pole ear design: Including the welding position of the pole ear, material selection, etc.
5.Tape design: Involving the position and specification design of the coating edge tape, pole ear protection tape, etc.
6.Performance indicators: Design the battery’s capacity density, energy density, discharge platform and other performance indicators according to application requirements.
7.Production process adaptation: The design needs to match the production equipment and process, such as the parameter setting of the winding machine, liquid injection machine and other equipment
F.A.Q.
In the manufacturing process of lithium-ion batteries, the core produced by the winding machine through the winding process is usually called the battery jelly rolls.
The manufacturing process of battery jelly rolls is to roll the positive electrode sheet, negative electrode sheet and separator together through the winding needle mechanism of the winding machine. The adjacent positive and negative electrode sheets are isolated by the separator to avoid short circuit. After winding, the winding core is fixed with the end tape to prevent it from unraveling, and then it flows to the next process. The most important thing in this process is to ensure that there is no physical contact short circuit between the positive and negative electrodes, and that the negative electrode sheet can completely cover the positive electrode sheet in both horizontal and vertical directions.
In lithium batteries, aluminum foil materials are used in current collectors, tabs, and outer packaging aluminum-plastic films. The so-called battery aluminum foil actually refers to the aluminum foil used for lithium-ion battery positive electrode materials. Therefore, battery foil refers to the aluminum foil used for lithium battery current collectors. On the one hand, it is the electrode of the current collector, and on the other hand, it serves as a carrier for lithium battery positive or negative electrode materials.
A battery cell is the most basic component of a battery, usually an electrochemical device encapsulated in a metal shell. It is a unit that stores and releases electrical energy, converting chemical energy into electrical energy through chemical reactions. A battery cell is usually composed of a positive electrode, a negative electrode, a separator, and an electrolyte.
At present, there are two main manufacturing processes for power lithium-ion batteries: winding and lamination. Cylindrical batteries can only be produced using the winding process. Cylindrical batteries are mainly represented by 18650 21700 26650 4680 etc.
Both prismatic cell battery and pouch cell battery lamination and winding processes can be used. Since the lamination process has a great impact on the battery capacity, prismatic cell batteries are often used in power batteries. The lamination process is used.