How about the safety performance of lithium-ion batteries?

Lithium battery safety performance (1) Continuous charging: Single battery is charged with 0.2ita constant current. When the terminal voltage of a single battery reaches the charging limit voltage, the battery is charged at a constant voltage and maintained for 28 days. After the test, there should be no leakage, no deflation, no rupture, no fire, no explosion (equivalent to full electric buoyancy). (2) Overcharge: The monolithic battery uses a constant current regulated power supply and is charged at a constant current of 3C. When the voltage reaches 10V, it is converted to a constant voltage charging. Stop charging until the battery explodes or catches fire, or the charging time is 90 minutes, or the battery surface temperature is stable (the temperature difference is less than 2°C in 45 minutes). The battery should not catch fire or explode (3C10V). The rechargeable battery is stabilized at a constant current of 0.5ita, and the voltage of the voltage source reaches the number of n×5v (n is a single battery in series), then it is changed to constant voltage charging, and charging is stopped until the battery explodes or fires, or the charging time is 90 minutes , The surface temperature of the battery is stable (the temperature difference is less than 2℃ within 45 minutes). The battery should not catch fire or explode. (3) Forced discharge (reverse charge): A single battery is first charged with a constant discharge of 0.2ita to the final voltage, and then charged in reverse with a current of 1ItA. The charging time is not less than 90min, the battery will not catch fire or explode; discharge one of the batteries to the end voltage, and the other batteries will be fully charged. Then, when the 1ItA constant discharge voltage is 0V, the battery should not catch fire or explode. (4) Short circuit test: After passing an external short circuit, the surface temperature of the single cell or battery is stable within 90 minutes (the temperature difference is 2 or less within 45 minutes). When the short circuit is stopped, the external circuit resistance should be less than 50 meters, and the battery should have no fire and no explosion ; The battery pack is negative, the resistance of the copper wire is less than 0.1, and the battery voltage is less than 0.2V or the surface temperature of the battery is stable (the temperature difference is 2°C or less within 45 minutes), the battery should be no fire, no explosion statement: this site Some pictures and content of the published article are from the Internet. If there is any infringement, please contact to delete the previous article: What are the fundamental factors affecting the cycle life of lithium-ion batteries?