How to detect whether the lithium ion battery reaches the safety index

First put the fully charged battery under test on the test plane of the testing machine, and then use a hydraulic cylinder to apply 13+1KN squeezing force, and finally squeeze the battery with a 32mm diameter steel rod plane, if the lithium ion battery can withstand Higher pressure and no explosion or fire occurred, indicating that the lithium-ion battery product is qualified. After being hit by a heavy object, the battery under test is fully charged and placed on the test plane of the testing machine. A steel column with a diameter of 15.8 mm is placed vertically in the center of the battery, and a weight of 9.1 kg is freely dropped from a height of 610 mm to the top of the battery. On the steel column. The battery does not catch fire or explode. Overcharge test The so-called overcharge test is actually to test whether the internal stability of the lithium-ion battery is stable. The method is very simple. First, fully charge the battery with 1C, and then perform an overcharge test according to 3C overcharge 10V. When the battery is overcharged, the voltage rises to It is stable for a period of time at a certain voltage, and the battery voltage rises rapidly when the time is close to a press time. When it rises to a certain limit, the battery top cap is broken and the voltage drops to 0V. During this process, the lithium-ion battery did not explode or catch fire, which means that the lithium-ion battery is a qualified product. The safety tests for lithium-ion batteries are important in the following aspects: they need to pass safety tests such as overcharge, short circuit, acupuncture, 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 perform an overcharge test according to 3C overcharge. When the battery is overcharged, the voltage rises to a certain voltage and stabilizes for a period of time. The battery voltage rises rapidly when it is close to the time, 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 fire or explode; acupuncture 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 from 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. Heavy object 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: How to replace the car battery?