METHOD AND APPARATUS OF ESTIMATING STATE OF HEALTH OF BATTERY

摘要

A method of estimating state of health (SOH) of a battery includes measuring an internal resistance (R) of the battery and calculating a voltage drop (ΔV) value by a relationship of ΔV=R×I, wherein the I value is equal to a preset current lower limit value at the available capacity of the battery. Then measuring an open circuit voltage (OCV) lower limit value by the ΔV value and obtaining a state of charge lower limit (SOC—1) from a correlation table of an OCV and a SOC of the battery. Finally, calculating a SOH value by a relationship of SOH=100%−SOC—1. The present disclosure also discloses an apparatus for estimating SOH of a battery.

主权项

1. A method of estimating state of health (SOH) of a battery comprising:
measuring an internal resistance (R) of a battery; calculating a voltage drop (ΔV) value by a relationship of ΔV=R×I, the current (I) value is equal to a preset current lower limit value at the available capacity; calculating an open circuit voltage (OCV) lower limit value according to the calculated ΔV value at the available capacity; obtaining a state of charge lower limit (SOC_1) value according to the calculated OCV lower limit value and the correlation table of an OCV value and a SOC; and calculating a SOH value at the moment by a relationship of SOH=100%−SOC_1 according to the obtained SOC—1 value.