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What are the primary lithium battery safety tests?

Views: 206     Author: Hedy     Publish Time: 2023-06-13      Origin: Site

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What are the primary lithium battery safety tests?

The following factors are critical for lithium-ion battery safety testing: the battery must pass safety tests such as overcharge, short circuit, acupuncture, extrusion, and heavy object impact, and it must not catch fire or explode.

1. Squeeze test:

install a fully charged lithium-ion battery on a level surface, apply a 13± 1KN squeeze force with a hydraulic cylinder, and flatten the battery with a 32mm steel rod. The battery will not catch fire or explode once the squeeze pressure exceeds Stop squeezing at the maximum.

2. Impact test:

After completely charging the battery, set it on a flat platform, insert a steel column with a diameter of 15.8mm vertically in the middle of the battery, and freely drop a weight of 9.1kg from a height of 610mm onto the steel column above the battery. The battery does not burn or burst.

3. Overcharge test:

completely charge the battery with 1C before performing an overcharge test with 3C overcharge 10V. When a battery is overcharged, the voltage increases to a specific level and then stabilizes for a while. When it reaches a particular threshold, the battery's high cap is removed, the voltage lowers to 0V, and the battery does not catch fire or explode.

4. Short-circuit test:

After fully charging the battery, short-circuit the positive and negative electrodes with a cable with a resistance of no more than 50m to evaluate the surface temperature change of the battery.

5. Needle penetration test:

Place a fully charged lithium-ion battery on a flat surface and use a 3mm steel needle to puncture it radially. The test battery does not burn or explode.

6. Temperature cycle test:

A lithium-ion battery temperature cycle test is used to replicate the safety of a lithium-ion battery when it is frequently subjected to low and high temperatures during transit or storage. The test involves very quick and dramatic temperature fluctuations. The sample should be free of fire, explosion, and liquid leakage after the test.

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The safety of lithium batteries and the lack of necessary laws have always been impediments to the lithium battery industry's progress. Thermal runaway of batteries is the most common direct cause of fire and explosion mishaps with lithium-ion batteries. On the one hand, inherent faults inside the battery cell generate temperature runaway; on the other hand, heat release produced by external impact also causes thermal runaway. Of fact, lithium battery safety tests and standards are always being enhanced to assure safe use.

We have a number of lithium battery PACK production lines, aging, capacity division and other production equipment and a large number of experienced industrial workers.

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