Method for diagnosing a battery cell for an energy storage device for a motor vehicle, computer program and / or computer-readable medium, a data processing device and a motor vehicle

DE102025101875A1Undetermined Publication Date: 2026-07-23BAYERISCHE MOTOREN WERKE AG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
BAYERISCHE MOTOREN WERKE AG
Filing Date
2025-01-20
Publication Date
2026-07-23

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Abstract

A method for diagnosing a battery cell for an energy storage device for a motor vehicle, comprising: acquiring a charging characteristic curve, wherein the charging characteristic curve characterizes a charging voltage of the battery cell during charging; acquiring a discharging characteristic curve, wherein the discharging characteristic curve characterizes a discharging voltage of the battery cell during discharging; determining, from the charging characteristic curve and the discharging characteristic curve, a voltage difference, wherein the voltage difference characterizes a hysteresis of the battery cell between the charging voltage and the discharging voltage; determining, from the charging characteristic curve and / or the discharging characteristic curve, a gradient of a plateau change; determining, from the voltage difference, a degradation parameter relating to a positive electrode and, from the gradient, a degradation parameter relating to a negative electrode; and outputting the degradation parameters.
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Citation Information

Patent Citations

  • Method for determining a cell state variable of an energy storage device of a motor vehicle, computer program, data processing device, battery control unit and motor vehicle

    DE102022129208A1

  • Method for determining the internal resistance of a battery cell of an energy storage device for an electrically powered motor vehicle, computer program and / or computer-readable medium, data processing device, electrically powered motor vehicle, charging station

    DE102023118719A1

  • Method for age-dependent diagnosis of a battery cell for an energy storage device for a motor vehicle, computer program and / or computer-readable medium, a data processing device and a motor vehicle

    DE102023130068A1