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To address this issue, the first step is to improve the manufacturing process and reduce impurities in battery manufacturing. This requires selecting a battery manufacturer with good product quality, and then conducting safety predictions for internal short circuits. Before thermal runaway occurs, it is necessary to find the monomer with internal short circuits. This means that if you have to find the characteristic parameters of the monomer, you can start with consistency. The battery is inconsistent, and the internal resistance is also inconsistent. As long as the monomer with mutation in the middle is found, it can be distinguished. In detail, the equivalent circuit of a normal battery and the equivalent circuit with a micro short circuit actually have the same form of equation, except that the parameters of the normal cell and the micro short circuit cell have changed. We can conduct research on these parameters to see some of their characteristics in the variation of internal short circuits.

A large amount of lithium ions are embedded in the negative electrode of a fully charged battery. After overcharging, lithium precipitation occurs on the negative electrode, resulting in needle shaped lithium metal crystals that puncture the separator and cause a short circuit. In bMS battery management systems, there is an overcharge protection strategy. When the system tests that the battery voltage reaches the threshold, it will shut off the charging circuit to protect the battery. Although manufacturers conduct some battery performance tests on bMS before leaving the factory, in order to prevent unforeseen circumstances, it is not recommended that users charge electric vehicles for a long time and choose formal charging equipment to eliminate overcharging hazards.

Mechanical and electrical incentives

Collision is a typical way of mechanical contact heating out of control, which is a car collision accident that causes battery damage. When a battery is damaged, internal short circuits can also occur, leading to uncontrolled heating. However, this type of short circuit is different from short circuits caused by electrochemical factors. Mechanical damage generally occurs instantaneously, and corresponding to sudden accidents in real life, strong impacts, overturns, and squeezing can cause the battery to become active and mechanical damage in a short period of time.

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