State judging device and control device of secondary battery
AssigneePanasonic EV Energy Co., Ltd.
InventorsMotoyoshi Okumura, Katsunori Maegawa
Life of this patent
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Abstract
A device which judges a change of a capacity balance between a cathode and an anode of a secondary battery in a non-destructive manner is provided. The secondary battery has one of the capacities of the cathode and the anode greater than the other capacity. A battery ECU calculates an internal resistance (DCIR) of the secondary battery based on a current and a voltage of the secondary battery. When the calculated internal resistance (DCIR) is higher than the initial state in a low SOC region or a high SOC region, the battery ECU judges that the capacity balance between the cathode and the anode of the secondary battery has changed.
Claims12
A state judging device of a secondary battery, comprising:
- a unit which measures a voltage of a secondary battery;
- a unit which measures a current of the secondary battery;
- a unit which calculates an internal resistance of the secondary battery based on the voltage and the current;
- and
- a unit which judges a change of a capacity balance between a cathode and an anode of the secondary battery based on a change of an SOC dependency of the internal resistance from an initial state.
A state judging device of a secondary battery, comprising:
- a unit which measures a voltage of a secondary battery;
- a unit which measures a current of the secondary battery;
- a unit which calculates a no-load voltage of the secondary battery based on the voltage and the current;
- and
- a unit which judges a change of a capacity balance between a cathode and an anode of the secondary battery based on a change of an SOC dependency of the no-load voltage from an initial state.
Dependencies are inferred from the claim text.