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AssigneeExide Technologies
InventorsRainer Bussar, Gerd Wessels Hoogestraat, Wolfgang Rudolf Fischer, Thomas Hopper, Nicolas Henri Bernard Redon, Olaf Sielemann, Sebastian Zeh
Estimating the term…
Determining a state of charge (SOC) of a rechargeable battery includes using a first process to determine a first value for the SOC of the battery and using a second process to determine a second value for the SOC of the battery and deriving the SOC as a weighted average of the first value for the SOC and the second value for the SOC. During a charging cycle of the battery an input charge of the battery is determined from an input current flowing into the battery and a charging time. During a discharging cycle an output charge of the battery is determined from an output current flowing out of the battery, a discharging time and an actual capacity of the battery is the sum of the input charge over charging cycles minus the sum of the output charge over discharging cycles.
A method for determining a state of charge of a rechargeable battery (1) comprising the steps:
A method according to one of the previous claims, wherein the weightings of the first and second processes is initially represented by the coefficient of determination (R2).
A method according to one of the previous claims, wherein for determining the input charge the input current is integrated over charging time and the result of integration is multiplied by a loss factor representing the losses occurring during charging of the battery (1).
A method according to one of the previous claims, wherein during a charging cycle the input current measured for a constant charging voltage is compared to a preset threshold value and if the input charge drops below the threshold value over a preset time period, stopping the charging cycle.
A method according to one of the previous claims, wherein the second process comprises the steps:
A method according to one of the previous claims, wherein during a charging cycle of the battery an average voltage across the battery is determined from a voltage across the battery (1) measured over time during charging of the battery (1) and wherein a value for the state of charge of the battery (1) is calculated from the average voltage across the battery (1) during charging.
A method according to one of the previous claims,
A computer program having a code for carrying out a method according to one of the previous claims.
Dependencies are inferred from the claim text.