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Polymer high-power batteries bring three effects during high rate discharge and fast charging: thermal effect, lithium ion evolution, and mechanical effect.
1. Frequent fast charging accelerates the polarization of battery cells.
When the continuous charging current of a polymer high-power battery is high, the ion concentration at the electrode increases, polarization intensifies, and the battery terminal voltage cannot directly correspond linearly to the charged amount of electricity/energy. At the same time, high current charging and an increase in internal resistance can exacerbate the Joule heating effect, leading to a series of side effects, such as reaction decomposition of electrolyte and gas production. The danger factor suddenly increases, which affects the safety of the battery. If it is a non power type battery, its lifespan will inevitably be significantly shortened.
2. Frequent fast charging may lead to crystallization of polymer high-power batteries.
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