What are the safety tests for lithium batteries?

What are the safety tests for lithium batteries?

With the introduction of new energy vehicles into the public eye, the name of lithium batteries has gradually become known by more and more people. As the core of new energy vehicles, the safety of lithium batteries is a topic of common concern for car companies and consumers. So what aspects does the lithium battery safety test include?

In fact, it is the same as the safety test of the battery pack. The safety performance test content of lithium battery includes overcharge, short circuit, drop, heating, vibration, squeeze, acupuncture, heavy object impact, etc. During the test, the specific method is to select a high-current shrapnel with a relatively stable connection function. The needle module can pass a large current of 50A, and the service life can reach more than 20w times.

Overcharge test: Fully charge the lithium battery, and then 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. When it approaches a certain time, the battery voltage rises rapidly, and when it reaches a certain limit , The battery top hat is pulled off, the voltage drops to ov, 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 not greater than s0mQ.

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. The test battery does not catch fire or explode.

Squeeze test: Place the fully charged battery on a flat surface, apply a 13+1KN squeezing force from a hydraulic cylinder, and squeeze the battery from the flat surface of a steel rod with a diameter of 32mm. Once the squeezing pressure reaches the maximum, stop squeezing , The battery does not catch fire, just don’t 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 On, the battery does not catch fire or explode.

Only after passing these tests can lithium batteries be truly installed on new energy vehicles and used by consumers.