The safety of lithium batteries has always been the focus of consumers' concerns, especially after experiencing the impact of safety reports like Tesla's electric car on fire.

　　So, what are the main safety tests for lithium batteries?

　　Squeeze test

　　Place the battery with full capacity on a flat surface, apply a 13±1KN squeezing force, and squeeze the battery with a flat steel rod with a diameter of 32mm. The battery does not catch fire or explode.

　　Impact test

　　After the battery is full of capacity, 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 to form a steel column to the battery. Impact. The battery does not catch fire or explode.

　　Overcharge test

　　Fully charge the battery with 1C, and perform an overcharge test in accordance with 3C overcharge 10V. Keep the 10V high voltage charging for a standard period of time, during which 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 not more than 50mΩ, and the surface temperature of the battery is tested. The maximum temperature of the battery surface is 140℃, and the battery does not catch fire or explode.

　　Nail penetration test:

　　This is the most controversial test project. The process is to 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 3 mm. The test battery does not catch fire or explode.

　　The safety performance of lithium batteries is very important. The above 5 tests are the safety test items and requirements for lithium batteries in international standards.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect substitute for lead-acid batteries and are the first choice in the energy storage industry;