Charging and charging supplementing circuit of series storage battery pack

The invention relates to a charging and charging supplementing circuit of a series storage battery pack. A corresponding balance circuit is arranged on each single storage battery in series storage batteries; when a battery pack enters a chargingsupplementing stage before overall charging is finished, the voltage sampling circuit samples the voltage of a single storage battery, the voltage and reference voltage are sent into the comparison circuit together to be compared, and the charging control circuit and the discharging circuit control charging or discharging according to a comparison result output by the comparison circuit, the charging control circuit stops the charging action until the voltages of all the voltage sampling circuits reach the battery charging termination voltage (set reference voltage), so that all the single storage batteries in the series storage battery pack can be fully charged, the use efficiency of the storage batteries is improved, and the service life of the storage batteries is