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Due to the significant difference between the method used during detection and the actual situation in the battery, it is not particularly reasonable to compare the puncture strength of the two types of separators directly. However, when the microstructure is fixed, the ones with high puncture strength have a relatively low assembly defect rate. But simply pursuing high puncture strength will inevitably lead to a decrease in other performance of the diaphragm. ⑦ thermal stability

The separator should maintain thermal stability within the temperature range used by the battery (-20 ℃~60 ℃). Generally speaking, the PE or PP materials currently used for diaphragms can meet the above requirements.

Normally, under vacuum conditions, with a constant temperature of 90 ℃ for 60 minutes, the transverse and longitudinal contraction of the diaphragm should be less than 5%.

③ Thermal sealing temperature of 18650 lithium-ion battery separator

Heat sealing temperature: The temperature at which the simulated battery (with a separator sandwiched between two planar electrodes and electrolyte used for general lithium-ion batteries) is heated, when the internal resistance increases by three orders of magnitude.

Closed cell temperature: The temperature at which the heat generated by external short circuits or abnormally high currents causes the closure of micropores in the diaphragm.

Melt crushing temperature: The temperature at which the diaphragm is heated to exceed the melting point of the sample, causing it to break.

④ Porosity of 18650 lithium-ion battery separator

The porosity of most lithium-ion battery separators ranges from 30% to 50%. There is a certain relationship between the size of porosity and internal resistance, but the absolute value of porosity between different types of membranes cannot be directly compared.

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