Lithium batteries are generally composed of positive and negative electrodes, electrolytes, battery separators, and protection circuit chips. Among them, the battery separator is an important component that supports the lithium battery to complete the electrochemical process of charging and discharging. Its main function is to separate the positive and negative electrodes of the battery to prevent short circuits due to contact between the two poles. At the same time, it has the function of passing electrolyte ions. Its performance directly affects the lithium and The overall performance of the battery. The battery separator is generally made of high-strength film, and the base material is generally PE or PP. It is resistant to corrosion by organic solvents and is a key component to ensure the safe performance of lithium batteries. When the temperature of the battery increases due to long-term use or abnormal conditions, the battery separator should have certain thermal stability to continue to isolate the positive and negative electrodes.
At present, there is no corresponding standard in China. ISO 14616-1997 "Heat Shrinkable Films of Polyethylene, Ethylene Copolymers and Their Mixtures - Determination of Shrinkage Stress" can be used to test the thermal stability of battery separators.
The test instrument can use GBPI's film heat shrinkage tester, which is based on Astm D2730 and iso 14616 international standards. Testing Equipment. The instrument can test 3 groups of samples at the same time. The high-precision force sensor and displacement sensor can accurately measure the thermal shrinkage performance parameters of the sample, and display the thermal shrinkage force, cold shrinkage force, and thermal shrinkage rate during the test in real-time.
