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Key points of lithium battery production process

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Time of issue:2022-08-08 15:08
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(Summary description)As the core component of the battery, the battery separator plays a key role in isolating the positive and negative electron conduction and allowing lithium ions to pass back and forth between the two electrodes.

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Key points of lithium battery production process

Categories:lithium ion battery News
Author:
Origin:
Time of issue:2022-08-08 15:08
Views:

Information

As the core component of the battery, the battery separator plays a key role in isolating the positive and negative electron conduction and allowing lithium ions to pass back and forth between the two electrodes. The microporous structure on the separator is an important channel for these ions to travel back and forth between the positive and negative electrodes. Its gas permeability will directly affect the performance of the battery. The gas permeability of the diaphragm refers to the amount of gas that the diaphragm passes through under a certain time pressure.

If the air permeability of the separator is not good, it will affect the transfer of lithium ions between the positive and negative electrodes, and then affect the charging and discharging of the lithium battery. The testing process is as follows: fix the battery diaphragm, apply air pressure on one side of the diaphragm, measure the pressure drop of the air pressure and the time used, and detect the air permeability of the diaphragm. The shorter the time used, the better the air permeability. During the hot pressing process, the diaphragm may be severely compressed, and the thickness of the diaphragm changes greatly, causing the micropores to be blocked, and the diaphragm will become transparent when observed with the naked eye. transmission.
Therefore, cell thermocompression shaping must also avoid this situation. These two aspects require that the smaller the hot-pressing pressure, the better, and the shorter the time, the better. On the other hand, the hot-pressing shaping must make the cell shape, the thickness of the cell meets the process requirements, the elasticity of the cell is reduced, and the consistency of the thickness of the finished cell is ensured. Process parameters such as pressure, time and temperature need to be optimized.

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