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Solving the safety issues of lithium batteries requires drawing on foreign experience

In recent years, it is an undeniable fact that electric vehicle fires have occurred frequently due to battery safety issues, which has made consumers who have doubts about electric vehicles even more resistant. The root cause is that factors such as overcharging, overheating, electric triggering, and collisions can all lead to thermal runaway of the power battery. The reasons for thermal runaway are related to unreasonable battery selection and thermal design, or external short circuits causing an increase in battery temperature, or loose cable joints. It can be solved from two aspects: battery design and management, such as developing materials to prevent thermal runaway and block the reaction of thermal runaway. For battery management, different temperature ranges can be predicted first to define the safety level.

In addition, the safety level of different batteries varies greatly. For example, in the event of a collision, the safety of lithium iron phosphate is higher than that of ternary lithium electronic batteries. Therefore, until now, we still insist on using lithium iron phosphate batteries on buses, and it is not suitable to use ternary lithium electronic batteries on a large scale, especially on 12 meter buses.

Domestic battery companies should also learn and study the safety design of Tesla batteries in order to make breakthroughs in safety issues. Objectively speaking, Tesla's batteries are not safe, at least individual batteries are not safe. However, unsafe individual batteries can achieve system safety because Tesla uses over 7000 18650 ternary nickel cobalt lithium batteries, and the combination of unsafe individual batteries is safe. This has also become a patent for Tesla's safety design.

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