After the lithium-ion battery is produced, it needs to carry out a series of tests before reaching the consumer to ensure the safety of the battery and reduce the safety hazard.
After the battery is fully charged, place it on a flat surface and place a 15.8 mm diameter steel column vertically in the center of the battery. Freely drop 9.1 kg from the height of 610 mm and place it on the steel column above the battery. The battery cannot ignite or explode.
2. Short circuit test
After the battery is fully charged, short the positive and negative terminals of the battery with a wire with a resistance of no more than 50mΩ. Test the surface temperature of the battery. The maximum temperature of the battery surface is 140 °C. The battery cover is open and the battery does not ignite or explode.
3. Extrusion test
Place the fully charged battery on a flat surface, apply a pressure of 13 ± 1 KN with a hydraulic cylinder, and then squeeze the battery with a 32 mm diameter steel bar. Once the extrusion pressure reaches the maximum stop extrusion, the battery will not ignite. Do not explode.
4. Overcharge test
The battery is fully charged 1C, and the overcharge test is performed according to 3C overcharge 10V. When the battery is overcharged, the voltage rises to a certain voltage for a while. When the battery is close to a certain time, the battery voltage rises rapidly. When it rises to a certain limit, the battery is very high. The cover is pulled down and the voltage drops to 0V, and the battery does not catch fire or explode.
5. Temperature cycle test
Lithium-ion battery temperature cycling test is used to simulate the safety of lithium-ion batteries during repeated transportation to low-temperature and high-temperature environments during lithium-ion battery transportation. Test with fast and extreme temperature changes. After the test, the sample should not ignite, explode or leak.
6. 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 will not ignite or explode.