Test the battery sample for 500 cycles in the following order：
a) Overvoltage charging;
b) After the protection device acts, stand for 1min
During overvoltage charging, the charging current is 1.5 times of the overcurrent charging protection current (1.5icp), and the charging voltage is the upper charging limit voltage (UUP)
The overcurrent charging protection circuit of the battery pack shall act during each cycle.