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Intermittent charging curve of battery
After a certain period of charging stoppage, continue charging with a reduced charging current. When the battery voltage rises again to the cut-off voltage V0, stop charging. Repeat this process several times (usually about 3-4 times), and the charging current will decrease by the set cut-off current value. Then enter the constant voltage charging stage, charging the battery with a constant voltage until the charging current decreases to the lower limit value, and the charging is completed. The main charging stage of the variable current intermittent charging method adopts an intermittent method with gradually decreasing current to increase the charging current under limited charging voltage conditions, which accelerates the charging process and shortens the charging time. However, this charging mode has a complex circuit and high cost, and is generally only considered for high-power fast charging.
Variable voltage intermittent charging
On the basis of the variable current intermittent charging method, some people have also studied the variable voltage intermittent charging method. The difference between the two lies in the charging process in the first stage, which replaces intermittent constant current with intermittent constant voltage. Comparing Figure 4 (a) and Figure 4 (b), it can be seen that constant voltage intermittent charging is more in line with the optimal charging curve. At each constant voltage charging stage, due to the constant voltage, the charging current naturally decreases exponentially, which is consistent with the characteristic that the acceptable rate of battery current gradually decreases with the progress of charging.
