To solve the safety problem of lithium batteries, reference should be made to foreign experience

Solving the safety problem of lithium batteries needs to learn from overseas experience

In recent years, due to the frequent occurrence of electric vehicle fire incidents caused by battery safety problems, it is an indisputable fact that the majority of consumers who already have doubts about electric vehicles are even more resistant. The root cause is that factors such as overcharging, overheating, electric triggering, and collisions may all lead to thermal runaway power cells. The cause of thermal runaway is related to the improper type selection and thermal design of the battery, or the increase in the temperature of the battery due to the external short circuit, or the loosening of the cable connector. It can be solved from two aspects of battery design and management, such as the development of materials to prevent thermal runaway to block thermal runaway reactions. For battery management, different temperature ranges can be predicted to define safety levels.

In addition, different batteries have different levels of safety. For example, in the event of a collision, the safety of lithium iron phosphate is higher than that of lithium ternary electron batteries. So far, we still insist on the use of lithium iron phosphate batteries in buses. For the time being, it is not appropriate to use lithium ternary electron batteries on a large scale., especially 12-meter buses.

Domestic battery companies want to make breakthroughs in safety issues, and should also study the safety design of Tesla batteries. Objectively speaking, Tesla's battery is not safe, at least the single battery is not safe. However, unsafe single cells can be system safe because Tesla uses more than 7,000 18650 ternary nickel-cobalt lithium batteries, and the unsafe batteries are safe to combine. This has also become a patent for Tesla's safety design.

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