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(1) Constant voltage charging method: During the charging process, the output voltage of the charging power supply remains constant. As the state of charge of the lithium-ion battery pack changes, the charging current is automatically adjusted. If the specified voltage constant value is appropriate, it can ensure the complete charging of the power lithium battery while minimizing gas evolution and water loss. This charging method only considers the variation of battery voltage as a single state and cannot effectively reflect the overall charging status of the battery. Its initial charging current is too high, often causing damage to the power lithium battery. Given this drawback, constant voltage charging is rarely used.
(2) Constant current charging method: During the entire charging process, the charging current is kept constant by adjusting the output voltage. Keeping the charging current constant, the charging rate is relatively low. The constant current charging control method is simple, but because the acceptable current capacity of lithium-ion battery packs gradually decreases with the charging process, in the later stage of charging, the charging capacity of power lithium batteries decreases, and the charging current utilization rate is greatly reduced. The advantages of this method are simple operation, convenience, easy implementation, and easy calculation of charging capacity.
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