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In order to avoid over-discharge or over-charge of the battery due to improper use, there are three protection mechanisms in the lithium battery. , it will automatically stop the power supply; the second is to choose the appropriate separator material, when the temperature rises to a certain value, the micro-scale pores on the separator will automatically dissolve, so that the lithium ions cannot pass through, and the internal reaction of the battery stops; the third is to set Safety valve (that is, the vent hole at the top of the battery), when the internal pressure of the battery rises to a certain value, the safety valve will automatically open to ensure the safety of the battery.

Sometimes, although the battery itself has safety control measures, the control fails due to some reasons, the lack of a safety valve or the gas is too late to release through the safety valve, the internal pressure of the battery will rise sharply and cause an explosion. As the battery capacity increases, the battery volume increases. It is also increasing, its heat dissipation performance will deteriorate, and the possibility of accidents will increase significantly. For lithium batteries for mobile phones, the basic requirement is that the probability of a safety accident should be less than one in a million, which is also the minimum standard acceptable to the public. For large-capacity lithium-ion batteries, especially those used in automobiles For batteries, it is particularly important to use forced cooling.

The choice of safer electrode materials and the choice of lithium manganate materials ensures that in the fully charged state, the lithium ions of the positive electrode have been completely embedded in the carbon pores of the negative electrode, which fundamentally avoids the generation of dendrites, while manganic acid The stable structure of lithium makes its oxidation performance much lower than that of lithium cobalt oxide, and its decomposition temperature exceeds 100 °C of lithium cobalt oxide. Even if an internal short circuit (acupuncture), external short circuit, and overcharge occur due to external force, it can completely avoid the The precipitation of metallic lithium causes the danger of combustion and explosion.