Secondary battery system
First Claim
1. A secondary battery system including a secondary battery,wherein the secondary battery includes an electrode body having a first electrode plate, a second electrode plate, and a separator,the first electrode plate including a first active material that makes a phase change by charge and discharge, andthe second electrode plate including a second active material that performs two-phase coexistence type charge and discharge,the secondary battery system comprising:
- dV/dQ calculation means for calculating a dV/dQ value that is a ratio of a change amount dV of a battery voltage V of the secondary battery with respect to a change amount dQ of a storage amount Q of the secondary battery when the storage amount Q is changed during charge and discharge of the secondary battery,wherein a state of the secondary battery system is detected by use of a characteristic point appearing in a Q-dV/dQ curve representing a relationship between the storage amount value Q and the dV/dQ value or a characteristic point appearing in a V-dV/dQ curve representing a relationship between the battery voltage value V and the dV/dQ value, andthe characteristic point is a maximum point, a minimum point, or an inflection point.
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Accused Products
Abstract
Provided is a secondary battery system which can accurately detect a state of a secondary battery system (such as a secondary battery state and a secondary battery system failure). The secondary battery system (6) includes dV/dQ calculation means which calculates a dV/dQ value as a ratio of a change amount dV of a battery voltage V of a secondary battery (100) against a change amount dQ of an accumulation amount Q when the accumulation amount Q of the secondary battery (100) is changed. The secondary battery system (6) detects the state of the secondary battery system (6) by using the dV/dQ value.
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Citations
12 Claims
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1. A secondary battery system including a secondary battery,
wherein the secondary battery includes an electrode body having a first electrode plate, a second electrode plate, and a separator, the first electrode plate including a first active material that makes a phase change by charge and discharge, and the second electrode plate including a second active material that performs two-phase coexistence type charge and discharge, the secondary battery system comprising: - dV/dQ calculation means for calculating a dV/dQ value that is a ratio of a change amount dV of a battery voltage V of the secondary battery with respect to a change amount dQ of a storage amount Q of the secondary battery when the storage amount Q is changed during charge and discharge of the secondary battery,
wherein a state of the secondary battery system is detected by use of a characteristic point appearing in a Q-dV/dQ curve representing a relationship between the storage amount value Q and the dV/dQ value or a characteristic point appearing in a V-dV/dQ curve representing a relationship between the battery voltage value V and the dV/dQ value, and the characteristic point is a maximum point, a minimum point, or an inflection point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- dV/dQ calculation means for calculating a dV/dQ value that is a ratio of a change amount dV of a battery voltage V of the secondary battery with respect to a change amount dQ of a storage amount Q of the secondary battery when the storage amount Q is changed during charge and discharge of the secondary battery,
Specification