How to ensure the safety of new energy vehicles (2)

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The last issue talked about the burning caused by the Tesla MODEL X driven by star Lin Zhiying hitting the ramp isolation belt. Recently, the new model "Qianshan Cui" of BYD, a leading domestic enterprise, also spontaneously ignited.

As we all know, BYD is the world's second largest manufacturer of rechargeable batteries. In the first half of 2022, BYD surpassed Tesla to become the world's new energy sales leader.

This "Qianshan Cui" is equipped with BYD's self-produced lithium iron phosphate battery, commonly known as "blade battery".

It's just that its structure is different from that of ordinary lithium iron phosphate batteries. The battery module is removed and a new packaging technology is used. It has a higher energy density than traditional lithium iron phosphate batteries and is close to the energy density of ternary lithium batteries. Battery life has also been improved.

Acupuncture experiments show that blade batteries are more stable and safer. "Acupuncture penetration test" is recognized in the industry as the most stringent testing method for the safety of battery cells. Acupuncture experiments are to pierce power battery cells with steel needles. , causing a large area short circuit inside the cell.

For the battery test of this "needle penetration test", QTS Testing Instrument launched a battery puncture tester

A 5-series ternary cell of the CATL that was tested had a voltage of 4.213V and a temperature of 23.9°C before the puncture. According to the national standard, after one hour of observation, the voltage dropped to 3.924V and the temperature rose to 93.7°C. And another 8 series ternary battery, the voltage of the battery before puncture is 4.15v, and the temperature is 24 ℃. After 1 hour of needling, the voltage dropped to 4.075v and the temperature rose to 37.7°C. No fire or explosion occurred after the puncture of the two batteries was completed.