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In response to the thermal runaway of lithium-ion battery packs, the current mainstream solution in China is to improve from two aspects: external protection and internal improvement. External protection refers to the upgrading and improvement of the system, while internal improvement refers to the improvement of the battery itself.

1. External short circuit

External short circuits may be caused by improper operation or misuse. Due to external short circuits, the discharge current of lithium-ion battery packs is high, which can cause the iron core to heat up. High temperatures can cause the diaphragm inside the iron core to shrink or completely damage, resulting in internal short circuits and causing fires.

2. Internal short circuit

Due to internal short circuit phenomenon, the high current discharge of the battery cell generates a large amount of heat, burns out the membrane, and causes a large short circuit phenomenon, resulting in high temperature, causing the electrolyte to decompose into gas, leading to excessive internal pressure. When the outer shell of the core cannot withstand this pressure, the core will catch fire.

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