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At the same time, defects in manufacturing processes can easily lead to safety issues in iron lithium-ion batteries. For example, if the ear of the battery cell is too long and comes into contact with the electrode or housing, it can cause a short circuit; Extreme ear pressure on the core causes a short circuit between the positive and negative poles; Leaving metal powder, copper foil, aluminum foil fragments, etc. between the two poles may cause diaphragm perforation and lead to a series of problems such as micro short circuits.

During the charging and discharging process, lithium-ion batteries generate heat. If the heat generated exceeds the battery's heat dissipation capacity, the lithium-ion battery will overheat, and the battery material will undergo destructive side reactions such as SEI film decomposition, electrolyte decomposition, positive electrode decomposition, reaction between negative electrode and electrolyte, and reaction between negative electrode and adhesive.

The external factors that affect the safety of iron lithium-ion batteries are relatively complex, such as overcharging, external short circuits, violent impacts, etc., all of which may cause spontaneous combustion of lithium-ion batteries. After the production of lithium batteries, a series of tests must be carried out before they reach consumers to ensure the safety of the batteries and reduce safety hazards as much as possible.

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