| CPC G01R 31/392 (2019.01) [G01R 31/3835 (2019.01); H02J 7/005 (2020.01)] | 12 Claims |
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1. A method for calculating state of health of battery, performed by a processing control circuit, comprising:
charging a battery under test to an upper voltage with a first constant current through a charging circuit and an electrical measuring circuit;
discharging the battery under test to a lower voltage with a second constant current through the charging circuit and the electrical measuring circuit;
obtaining an accumulated discharge capacity from the upper voltage to the lower voltage through the electrical measuring circuit; and
calculating a state of health of the battery under test at least according to the accumulated discharge capacity and a design capacity,
wherein calculating the state of health of the battery under test at least according to the accumulated discharge capacity and the design capacity comprises:
calculating a sum of the accumulated discharge capacity, an unused capacity and an aged capacity, and dividing the sum by the design capacity to obtain a quotient, wherein the unused capacity is a difference between a current state of charge and a full state of charge that is pre-stored by a memory connected to the processing control circuit, and the aged capacity is a difference between a current capacity and the design capacity; and
using the quotient as the state of health.
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