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Question: Why does the constant voltage charging current of the battery gradually decrease?

by:Power Kingdom     2021-06-30
Tags: Q: Why does the constant voltage charging current of the battery gradually decrease? Answer: During the constant voltage charging of the battery, the voltage of the charging power supply maintains a constant value during the entire charging time. As the battery terminal voltage gradually increases, the current gradually decreases. Compared with the constant current charging method, the charging process is closer to the optimal charging curve. So why does the constant voltage charging current gradually decrease? This is because when the constant current process is terminated, although the internal electrochemical polarization of the battery remains at the same level in the entire constant current, the constant voltage process, and then the constant electric field, the internal pb concentration polarization is gradually eliminated, and the ionic The number and speed of migration show a gradual decrease in current.
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