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US 12,656,404 B2Granted
Secondary battery system
AssigneeDenso Corporation
InventorsYuji Yamagami, Masaaki Kitagawa, Hisashi Umemoto, Shuhei Yoshida
Life of this patent
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Abstract
A secondary battery system includes a secondary battery having an electrode body impregnated with an electrolytic solution containing metal ions. The secondary battery system measures an impedance of the secondary battery. The secondary battery system detects high-rate deterioration caused by uneven concentration of the metal ions in the electrolytic solution impregnated into the electrode body.
Claims7
A secondary battery system comprising:
- a secondary battery having an electrode body impregnated with an electrolytic solution containing metal ions;
- and
- at least one processor with a memory storing computer program code executable by the processor configured to cause the secondary battery system to implement:
- an impedance measurement unit configured to measure an impedance of the secondary battery;
- and
- a diagnosis unit configured to detect high-rate deterioration, which is caused by uneven concentration of the metal ions in the electrolytic solution impregnated into the electrode body, in the secondary battery based on an absolute value of a difference between a direct current (DC) resistance component and a reaction resistance component of the impedance measured by the impedance measurement unit during DC charging or discharging and the impedance measured by the impedance measurement unit after DC charging or discharging has stopped,
- wherein the diagnosis unit determines that high-rate deterioration has occurred in the secondary battery when the absolute value of the difference exceeds a predetermined reference value.
4 more elements
A secondary battery system comprising:
- a secondary battery having an electrode body impregnated with an electrolytic solution containing metal ions;
- and
- at least one processor configured to
- measure an impedance of the secondary battery, and
- detect high-rate deterioration, which is caused by uneven concentration of the metal ions in the electrolytic solution impregnated into the electrode body, in the secondary battery based on an absolute value of a difference between a direct current (DC) resistance component and a reaction resistance component of the impedance during DC charging or discharging and the impedance after DC charging or discharging has stopped,
- wherein the at least one processor determines that high-rate deterioration has occurred in the secondary battery when the absolute value of the difference exceeds a predetermined reference value.
3 more elements
Dependencies are inferred from the claim text.