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Analysis of the causes of ignition in power lithium-ion battery packs

The most important reason for the ignition of lithium-ion battery packs is that the heat inside the battery cannot be released according to the design requirements, leading to ignition after reaching the ignition point of internal and external combustion materials. The important reasons for this include external short circuits, external high temperatures, and internal short circuits.

As a source of energy for pure electric vehicles, the important reason for lithium-ion battery pack catching fire is the thermal runaway caused by battery overheating, which is most likely to occur during battery charging and discharging processes. Due to the inherent internal resistance of lithium-ion batteries, they generate a certain amount of heat while outputting electrical energy to power pure electric vehicles, causing their temperature to increase. When their temperature exceeds their normal operating temperature range, it will damage the lifespan and safety of the entire lithium-ion battery pack.

The power lithium-ion battery system is composed of multiple individual power lithium-ion battery cells. During operation, a large amount of heat accumulates in the narrow battery box. If the heat cannot be quickly dissipated in time, high temperatures can affect the lifespan of the power lithium-ion battery pack and even cause thermal runaway, leading to accidents such as fire and explosion.

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