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Lithium ion batteries: In order to prevent over discharge or overcharging caused by improper use, a triple protection mechanism is installed inside a single lithium-ion battery. One is the use of switching elements. When the temperature inside the battery rises, its resistance increases accordingly. When the temperature is too high, the power supply will automatically stop; The second is to choose appropriate partition materials. When the temperature rises to a certain value, the micron sized micropores on the partition will automatically dissolve, preventing lithium ions from passing through and stopping internal reactions in the battery; The third is to set a safety valve (which is the vent hole on the top of the battery). When the internal pressure of the battery rises to a certain value, the safety valve automatically opens to ensure the safety of the battery's use.

Sometimes, although the battery itself has safety control measures, due to certain reasons, the control fails, and there is a lack of safety valve or gas cannot be released through the safety valve in time, causing the internal pressure of the battery to rise sharply and cause an explosion.

In general, the total energy stored in lithium-ion batteries is inversely proportional to their safety. As the battery capacity increases, the battery volume also increases, resulting in poor heat dissipation performance and a significant increase in the likelihood of accidents. The basic requirement for lithium-ion batteries used in mobile phones is that the probability of safety accidents should be less than one in a million, which is also the minimum standard acceptable to the public. Regarding high-capacity lithium-ion batteries, especially those used in automobiles, it is particularly important to use forced cooling.

Choosing a safer electrode material and lithium manganese oxide material ensures a fully charged state in terms of molecular structure. The lithium ions in the positive electrode have been fully embedded in the negative electrode carbon pores, fundamentally preventing the occurrence of dendrites. At the same time, the stable structure of lithium manganese oxide makes its oxidation performance much lower than that of lithium cobalt oxide, and the decomposition temperature exceeds 100 ℃ of lithium cobalt oxide. Even if internal short circuits (punctures), external short circuits, and overcharging occur due to external forces, it can completely prevent the danger of combustion and explosion caused by the precipitation of lithium metal.

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