How do lithium-ion batteries undergo safety testing?

The safety tests for lithium-ion batteries are important in the following aspects: safety tests such as overcharge, short circuit, needle penetration, squeeze, and heavy object impact must be carried out to prevent the battery from catching fire and exploding. The specific method is as follows: The overcharge test of the lithium ion battery is carried out according to the 3C overcharge method. When the battery is overcharged, the voltage rises to a certain voltage and stabilizes for a period of time. When it is close to a certain time, the battery voltage rises rapidly and rises to a certain level. The battery top cover was pulled off, the voltage dropped to 0V, the battery did not catch fire and exploded. Short-circuit a battery pack with a wire with a resistance of no more than 50m, and test the change in the surface temperature of the battery pack. The highest temperature on the surface of the battery pack is 140℃. The battery pack cover is pulled open, and the battery does not catch fire or explode; acupuncture Test: Place a fully charged battery on a flat surface, and pierce the battery radially with a steel needle with a diameter of 3mm. Extrusion test: Place the charged battery on a flat surface, apply an extrusion pressure of 13+1KN by a hydraulic cylinder, squeeze the battery with a flat steel rod with a diameter of 32mm, and the extrusion pressure reaches the maximum stop extruding amount When the battery does not catch fire, it does not explode. 1. Lithium-ion battery short-circuit safety test: After charging, short-circuit the positive and negative poles of the battery through a wire with a resistance of not more than 50m, and test the change in the surface temperature of the battery. The maximum temperature is 140°C. Open the battery cover and the battery does not catch fire. Does not explode. 2. Acupuncture test for safety test of lithium-ion battery: Place a fully charged battery on a flat surface and pierce it with a steel needle with a diameter of 3 mm in the radial direction. Check if the battery catches fire or explodes. 3. Safety test of lithium-ion battery squeeze test: Put the fully charged battery on a flat surface, apply an extrusion pressure of 13+1KN through a hydraulic cylinder, and extrude the battery through a flat surface with a steel rod diameter of 32mm. Once the battery is squeezed When the outlet pressure reaches the maximum value, test whether the battery explodes. 4. Safety test of heavy object impact test of lithium ion battery: After the battery is fully charged, place it on a flat surface, put a steel column with a diameter of 15.8mm vertically in the center of the battery, and free the weight of 9.1kg from the height of 610mm. The ground fell on the steel pole above the battery. Test whether the battery explodes. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.