Estimation of the state of deterioration of an electric battery
First Claim
1. A method for managing an electrochemical accumulator, comprising:
- determining an estimated value of a state of deterioration of the accumulator from a history of voltage values across the accumulator, a history of an intensity of current flowing through the accumulator, and a history of a temperature of the accumulator,wherein the estimated value is a barycentric value of the state of deterioration calculated as a barycenter of at least two values indicative of the state of deterioration of the accumulator associated with barycentric coefficients based on at least one age value of the accumulator, the at least two values including a first value indicative of the state of deterioration of the accumulator calculated by a first method and a second value indicative of the state of deterioration of the accumulator calculated by a second method different from the first method, andwherein from an initial commissioning state of the accumulator, barycentric coefficients are varied at least once to calculate a next barycentric value of the state of deterioration of the accumulator, when a previous value of the state of deterioration of the accumulator, calculated according to the first method, has passed a first threshold; and
managing a recharging of the accumulator based on the estimated value, wherein the recharging of the accumulator, an end-of-charging voltage is fixed that is calculated based on the barycentric value of the state of deterioration of the accumulator, the end-of-charging voltage being gradually increased during use of the accumulator onboard a vehicle.
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Abstract
A method for managing an electrochemical accumulator or a storage battery includes determining an estimated value of a state of deterioration of the accumulator from the accumulator'"'"'s history of voltage values, intensity of current flow, and temperature. The estimated value is a barycentric value of the state of deterioration calculated as a barycenter of at least two values. The at least two values include a first value indicative of the state of deterioration of the accumulator calculated by a first method and a second value indicative of the state of deterioration of the accumulator calculated by a second method different from the first method. From an initial commissioning state of the accumulator, barycentric coefficients are varied at least once to calculate the next barycentric value when a previous value of the state of deterioration of the accumulator, calculated according to the first method, has passed a first threshold.
10 Citations
8 Claims
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1. A method for managing an electrochemical accumulator, comprising:
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determining an estimated value of a state of deterioration of the accumulator from a history of voltage values across the accumulator, a history of an intensity of current flowing through the accumulator, and a history of a temperature of the accumulator, wherein the estimated value is a barycentric value of the state of deterioration calculated as a barycenter of at least two values indicative of the state of deterioration of the accumulator associated with barycentric coefficients based on at least one age value of the accumulator, the at least two values including a first value indicative of the state of deterioration of the accumulator calculated by a first method and a second value indicative of the state of deterioration of the accumulator calculated by a second method different from the first method, and wherein from an initial commissioning state of the accumulator, barycentric coefficients are varied at least once to calculate a next barycentric value of the state of deterioration of the accumulator, when a previous value of the state of deterioration of the accumulator, calculated according to the first method, has passed a first threshold; and managing a recharging of the accumulator based on the estimated value, wherein the recharging of the accumulator, an end-of-charging voltage is fixed that is calculated based on the barycentric value of the state of deterioration of the accumulator, the end-of-charging voltage being gradually increased during use of the accumulator onboard a vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electric power supply system for a motor vehicle, comprising:
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at least one electrochemical accumulator; a temperature sensor associated with the accumulator; a voltage sensor and a current intensity sensor to estimate, respectively, a voltage across the accumulator and an intensity of current passing through the accumulator; and a processing circuitry configured to estimate a level of charge of the accumulator over time by using values of the voltage and the intensity, calculate a barycentric value of a state of deterioration of the accumulator, including a barycenter of at least one first and one second value characterizing a state of deterioration of the accumulator, the first and second values associated with barycentric coefficients based on at least one age value of the accumulator are calculated by two different methods, wherein barycentric coefficients used to calculate the barycentric value of the state of deterioration of the accumulator at a given time are dependent on a previous value calculated according to a first method during assessment thereof at a previous time, and configured to increase, during a life cycle of the accumulator, an end-of-charging voltage defining a maximum voltage to which a recharging system is authorized to bring the accumulator, the end-of-charging voltage being fixed based on the calculated barycentric value of the state of deterioration of the accumulator.
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Specification