The following aspects are important for the safety test of lithium-ion batteries: it is necessary to pass the safety tests such as overcharge, short circuit, acupuncture, extrusion, and heavy object impact, and the battery can not catch fire or explode.

1. Squeeze test: place a fully charged lithium-ion battery on a flat surface, apply a 13± 1KN squeeze force by a hydraulic cylinder, and squeeze the battery flat by a steel rod with a diameter of 32mm. Once the squeeze pressure reaches Stop squeezing at the maximum, the battery will not catch fire or explode.

2. Impact test: After the battery is fully charged, place it on a flat surface, place a steel column with a diameter of 15.8mm vertically in the center of the battery, and freely drop a weight of 9.1kg onto the steel column above the battery from a height of 610mm. The battery does not catch fire or explode.

3. Overcharge test: fully charge the battery with 1C, and conduct an overcharge test according to 3C overcharge 10V. When the battery is overcharged, the voltage rises to a certain voltage and stabilizes for a period of time. When it reaches a certain limit, the high cap of the battery is pulled off, the voltage drops to 0V, and the battery does not catch fire or explode.

4. Short-circuit test: after the battery is fully charged, short-circuit the positive and negative electrodes of the battery with a wire with a resistance of no more than 50m to test the surface temperature change of the battery. .

5. Needle penetration test: Place a fully charged lithium-ion battery on a flat surface and pierce the battery radially with a steel needle with a diameter of 3mm. The test battery does not catch fire or explode.

6. Temperature cycle test: The temperature cycle test of lithium-ion battery is used to simulate the safety of lithium-ion battery when it is repeatedly exposed to low temperature and high temperature during transportation or storage. The test is to use rapid and extreme temperature changes are made. After the test, the sample should be free of fire, explosion and liquid leakage.

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