As items frequently contacted in daily life, such as lithium batteries in mobile phones, dry batteries in remote controls, button batteries in electronic watches, etc., have been closely linked with our lives. Therefore, after the battery is produced, a series of tests should be carried out before reaching consumers to ensure the safety of the battery and reduce potential safety hazards.

Battery safety detection methods are mainly divided into the following five categories.

Squeeze test: put the fully charged battery on a flat surface, and apply 13 ± 1kN squeeze pressure to squeeze the battery by the oil cylinder. Once the squeeze pressure reaches the maximum, stop squeezing, and the battery will not fire and explode.

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

Overcharge test: fully charge the battery with 1C, and carry out the overcharge test according to 3C overcharge of 10V. When the battery overcharges, the voltage rises to a certain voltage, which is stable for a period of time. When it approaches a certain time, the battery voltage rises rapidly. When it rises to a certain limit, the high cap of the battery is pulled off, and the voltage drops to 0V. The battery does not ignite or explode.

Short circuit test: after the battery is fully charged, use a wire with a resistance of no more than 50m to short circuit the positive and negative poles of the battery. Test the change of the surface temperature of the battery. The maximum temperature of the battery surface is 140 ℃. The battery cap is opened, and the battery will not ignite or explode.

Acupuncture test: put the fully charged battery on a plane, and puncture the battery radially with a steel needle. Test the battery without fire or explosion.