The lithium battery safety test mainly has the following aspects: it needs to pass the safety test such as overcharge, short circuit, acupuncture, extrusion, heavy object impact, etc. The battery can not be fired or exploded, the following are specific methods:
1, overcharge test
The lithium battery is fully charged, and the overcharge test is performed according to 3C overcharge. When the battery is overcharged, the voltage rises to a certain voltage for a certain period of time. When the battery voltage rises to a certain time, the battery voltage rises rapidly. When it rises to a certain limit, the battery high cap Pull off, the voltage drops to 0V, the battery does not catch fire, explosion.
2, 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 not more than 50mΩ, and test the surface temperature of the battery. The maximum temperature of the battery surface is 140 °C, the battery cap is opened, the battery does not ignite or explode; the acupuncture test: Place the fully charged battery on a flat surface and pierce the battery radially with a 3 mm diameter steel needle. The test battery can not ignite or explode; the extrusion test: put the fully charged battery on a flat surface, apply the 13+1KN pressing force by the hydraulic cylinder, and squeeze the battery from the 32mm diameter steel rod plane. Once the squeezing pressure reaches the maximum stop extrusion, the battery does not ignite and does not explode.
3, heavy impact test
After fully charging the battery, place it on a flat surface, place the steel column with a diameter of 15.8 mm vertically in the center of the battery, and freely drop the weight of 9.1 kg from the height of 610 mm onto the steel column above the battery. The battery does not ignite. Do not explode.
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