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2. Battery structure design: When manufacturing power lithium-ion batteries, it is possible to consider adding appropriate gaps between the positive and negative electrodes to improve the ductility of the separator. At the same time, an explosion-proof valve is added to the cover plate at the top of the battery to prevent explosion and a large amount of electrolyte leakage, and to increase the probability of the battery passing through the needle;

3. Diaphragm: Diaphragm is important in power lithium-ion batteries to separate the positive and negative poles of the battery, preventing short circuits between the two poles. The closure temperature and rupture temperature of the separator are crucial for determining whether the battery can pass the needle piercing project. We should try to control the battery separator to maintain a lower closure temperature and a higher rupture temperature, and the development of PE and PP composite membranes and ceramic separators is the trend and direction of separator development;

4. Electrolyte: The electrolyte used in power lithium-ion batteries is a combination of conductive lithium salts and organic solvents. These organic solvents have low flash points, making the electrolyte in power lithium-ion batteries prone to combustion when heated after contact with air. The addition of flame retardant additives can improve the stability and safety of the battery itself, which is an effective method to improve needle penetration rate.

Needling is not equal to the safety of the power lithium-ion battery, and not doing the needling test is not equal to the insecurity of the battery: the safety of the power lithium-ion battery is mainly reflected in the thermal safety, mechanical safety, electrical safety and Functional safety of the system, rather than the safety of the battery cell. In its view, the single battery cell is similar to the ignition test of the flammability of gasoline and diesel, completely ignoring the protection purpose of the fuel tank. In reality, the situation where the battery cell is punctured does not occur, and blunt puncture and compression at the bottom of the battery pack are the more suitable testing methods for real-world scenarios.

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