What are the methods for safety performance testing of lithium-ion batteries

The safety tests for lithium-ion batteries are important in the following aspects: they need to pass safety tests such as overcharge, short circuit, needle stick, squeeze, heavy object impact, etc., and the battery does not fire or explode. The following is the specific method: over Charge test Fully charge the lithium-ion battery, and conduct an overcharge test in accordance with 3C overcharge. When the battery is overcharged, the voltage rises to a certain voltage and stabilizes for a period of time. When the battery voltage is close to a press time, the battery voltage rises rapidly, and when it rises to a certain limit , The battery top hat is pulled off, the voltage drops to 0V, and the battery does not catch fire or explode. Short circuit test After the battery is fully charged, the positive and negative electrodes of the battery are short-circuited with a wire with a resistance of no more than 50m, and the surface temperature of the battery is tested. The maximum temperature of the battery surface is 140°C. The battery cap is pulled apart, and the battery does not catch fire or explode; Test: Place the fully charged battery on a flat surface and pierce the battery in the radial direction with a steel needle with a diameter of 3mm. Test the battery without fire or explosion; squeeze test: place the fully charged battery on a flat surface, apply a pressure of 13+1KN by a hydraulic cylinder, and squeeze the battery by the flat surface of a steel rod with a diameter of 32mm , Once the squeeze pressure reaches the maximum, stop squeezing, the battery does not catch fire and does not explode. 4 Weight 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 drop a 9.1kg weight freely from a height of 610mm onto the steel column above the battery , The battery does not catch fire or explode. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are the precautions for the use of high-rate batteries