What tests should be done for lifepo4 lithium batteries?

In recent years, lifepo4 lithium batteries safety incidents have occurred frequently. After the production of lifepo4 lithium batteries and before reaching consumers, a series of tests should be carried out to ensure the safety of batteries and reduce potential safety hazards. The following are common test items.

1. Extrusion test: put the fully charged battery on a plane, apply 13 ± 1KN extrusion pressure by the hydraulic cylinder, and squeeze the battery from the plane of the steel bar with a diameter of 32mm. Once the extrusion pressure reaches the maximum, stop the extrusion, and the battery will not ignite or explode.

2. Overcharge test: fully charge the battery with 1C, and carry out the overcharge test according to 3C overcharge 10V. When the battery overcharges, the voltage rises to a certain voltage for a period of time, and when it approaches a certain time, the battery voltage rises rapidly. When it rises to a certain limit, the high cap of the battery is pulled off, and the voltage drops to 0V, and the battery does not ignite or explode.

3. Impact test: After the battery is fully charged, place it on a plane, place a steel column with a diameter of 15.8 mm vertically in the center of the battery, and drop a weight of 9.1 kg freely from a height of 610 mm onto the steel column above the battery. The battery shall not ignite or explode.

4. Temperature cycle test: The temperature cycle test of lifepo4 lithium batteries are used to simulate the safety of lifepo4 lithium batteries under repeated exposure to low temperature and high temperature during transportation or storage. The test is conducted by using rapid and extreme temperature changes. After the test, the sample shall be free from fire, explosion and liquid leakage.

5. Short circuit test: after the battery is fully charged, use a wire with a resistance of no more than 50m Ω to short circuit the positive and negative poles of the battery. Test the temperature change of the battery surface. The maximum temperature of the battery surface is 140 ℃. The battery cap is pulled open, and the battery does not ignite or explode.

6.Acupuncture test: place the fully charged battery on a plane, and puncture the battery radially with a steel needle with a diameter of 3mm. Test the battery without fire or explosion.

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