METHOD FOR ESTIMATING THE STATE OF CHARGE SOC OF A BATTERY ASSEMBLY, CORRESPONDING APPARATUS FOR ESTIMATING THE STATE OF CHARGE OF A BATTERY ASSEMBLY AND CORRESPONDING COMPUTER PROGRAM

摘要

The proposal concerns a method and apparatus for estimating the state of charge SOC of a battery assembly (20, 22), the method comprising the steps of - determining the correspondence between the dependency of the state of charge of a battery assembly (20, 22), to the open-circuit voltage OCV of said battery assembly (20, 22), - monitoring the slope of a voltage recovery curve in a resting period of said battery assembly and checking if the slope of said voltage recovery curve is below a predefined limit value, - estimating the state of charge of the battery assembly (20, 22) by adding a fixed voltage value ΔU to the momentary open-circuit voltage U_t1 measured for said point in time t1 for which it was found that the slope of said voltage recovery curve is below said predefined limit value and by looking up, the corresponding state of charge. The determination of an exact state of charge is important for an appropriate battery management. The proposal also concerns a corresponding computer program.