What is the method of detecting a gas permeability of lithium ion battery diaphragm?

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

Lithium-ion battery diaphragm gas permeability test method, using a gas permeable measurement process, characterized, the battery diaphragm gas permeability test process includes a fixed battery diaphragm, applying air pressure, metering pressure drop and time, detecting the gas permeability of the diaphragm on the side of the diaphragm side. In the case of a fixed lithium ion battery diaphragm, a certain gas pressure is applied to the side of the diaphragm, and the air pressure will gradually decrease due to the micropores present, until the atmospheric pressure is equal to the atmospheric pressure. When the comparative pressure is lowered from the initial pressure to the termination pressure, the gas permeability of the diaphragm can be known.

By comparing the pressure drop time of different separators, it can be compared to their gas permeability performance. The smaller the pressure drop time, the better the breathable performance. The entire test process is simple, fast, and the data can directly reactivate the diaphragm, which has significant practical properties.

During the whole process, you should pay attention to: 1, make sure the test device is sealed, and the sealing process does not damage the diaphragm. 2, the initial pressure value should not be too large, so as not to damage the separator. 3.

When testing different lithium-ion battery diaphragms, there should be certain initial gas pressure values ​​and termination of the air pressure value, so that the time recorded is more meaningful. The percentage of the percentage of the lithium-ion battery diaphragm is related to each other. If the diaphragm is very ventilated, the surface density of the diaphragm will decrease, which has a certain impact on the performance of the battery.

However, if other parameters have achieved ideal, while the gas permeability of the diaphragm is not good, the same will affect the performance of the battery, so it is necessary to detect the gas permeability of the diaphragm.

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