The safety of lithium-ion batteries is paramount, and the diaphragm's properties directly influence this. One key characteristic is air permeability, which indicates how easily air can pass through the diaphragm. Proper air permeability is essential for maintaining consistent ion conductivity and preventing potential safety hazards.
A diaphragm with inadequate air permeability can lead to uneven ion distribution, increased internal resistance, and ultimately, thermal runaway – a dangerous condition where the battery overheats and can catch fire. Conversely, excessively high air permeability might compromise the diaphragm's mechanical integrity, potentially leading to short circuits.
Therefore, accurate measurement of air permeability is crucial for quality control during diaphragm manufacturing. In a typical test, a sample of the diaphragm is placed in a test chamber, and a controlled pressure difference is applied across the sample. The time required for a specific volume of air to pass through the diaphragm is measured, and the air permeability is calculated. This measurement provides valuable insights into the diaphragm's pore structure and its ability to facilitate ion transport.
Equipment like Labthink C190H Air Permeability Tester which adopts volume method is professionally applicable to the gas permeability test of battery diaphragm, breathable membrane and related polymer materials, as well as the gas permeability test of cigarette paper and various papers.
Accurate air permeability testing contributes to the development of safer and more reliable lithium-ion batteries. By ensuring that diaphragms meet stringent quality standards, manufacturers can minimize the risk of battery failures and enhance the overall performance of EVs and other applications.
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