BATTERY DEGRADATION DETERMINATION DEVICE, BATTERY DEGRADATION DETERMINATION METHOD AND BATTERY DEGRADATION DETERMINATION SYSTEM
First Claim
1. A battery degradation determination device comprising:
- a fitting module configured to fit AC impedance measurement data into an equivalent circuit model including at least one circuit block in which a resistance and a constant phase element are connected in parallel, and to obtain circuit constants in the equivalent circuit model;
a P-value saving module configured to save P values being index of the constant phase element obtained by fitting AC impedance measurement data of a reference battery to the equivalent circuit model; and
a degradation determination module configured to perform degradation determination for a battery as a determination target based on circuit constants obtained by fitting AC impedance measurement data of the battery as a determination target to the equivalent circuit model with the use of the P values as fixed values, with reference to correlations between degrees of battery degradation and the circuit constants in the equivalent circuit model.
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Abstract
A battery degradation determination device includes a fitting module configured to fit AC impedance measurement data into an equivalent circuit model including at least one circuit block in which a resistance and a constant phase element are connected in parallel, and to obtain circuit constants in the equivalent circuit model, a P-value saving module configured to save P values being index of the constant phase element obtained by fitting AC impedance measurement data of a reference battery to the equivalent circuit model, and a degradation determination module configured to perform degradation determination for a battery as a determination target based on circuit constants obtained by fitting AC impedance measurement data of the battery as a determination target to the equivalent circuit model with the use of the P values as fixed values, with reference to correlations between degrees of battery degradation and the circuit constants in the equivalent circuit model.
6 Citations
6 Claims
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1. A battery degradation determination device comprising:
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a fitting module configured to fit AC impedance measurement data into an equivalent circuit model including at least one circuit block in which a resistance and a constant phase element are connected in parallel, and to obtain circuit constants in the equivalent circuit model; a P-value saving module configured to save P values being index of the constant phase element obtained by fitting AC impedance measurement data of a reference battery to the equivalent circuit model; and a degradation determination module configured to perform degradation determination for a battery as a determination target based on circuit constants obtained by fitting AC impedance measurement data of the battery as a determination target to the equivalent circuit model with the use of the P values as fixed values, with reference to correlations between degrees of battery degradation and the circuit constants in the equivalent circuit model. - View Dependent Claims (2, 3)
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4. A battery degradation determination method comprising:
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saving P values being index of a constant phase element obtained by fitting AC impedance measurement data of a reference battery to an equivalent circuit model including at least one circuit block in which a resistance and the constant phase element are connected in parallel; and performing degradation determination for a battery as a determination target based on circuit constants obtained by fitting AC impedance measurement data of the battery as a determination target to the equivalent circuit model with the use of the P values as fixed values, with reference to database storing correlations between degrees of battery degradation and the circuit constants in the equivalent circuit model. - View Dependent Claims (5)
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6. A battery degradation determination system comprising:
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an AC impedance measurement device configured to measure AC impedance of a battery; a battery degradation determination device comprising a fitting module configured to fit AC impedance measurement data obtained from the AC impedance measurement device into an equivalent circuit model including at least one circuit block in which a resistance and a constant phase element are connected in parallel, and to obtain circuit constants in the equivalent circuit model; and a database configured to store correlations between degrees of battery degradation and the circuit constants in the equivalent circuit model, wherein the battery degradation determination device comprises a P-value saving module configured to save P values being index of the constant phase element obtained by fitting AC impedance measurement data of a reference battery obtained from the AC impedance measurement device to the equivalent circuit model, and a degradation determination module configured to perform degradation determination for a battery as a determination target based on circuit constants obtained by fitting AC impedance measurement data of the battery as a determination target obtained from the AC impedance measurement device to the equivalent circuit model with the use of the P values as fixed values, with reference to the database.
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Specification