SECONDARY BATTERY SYSTEM
First Claim
1. A secondary battery system comprising a secondary battery, whereinthe secondary battery includes a positive active material formed of lithium manganate having a spinel crystal structure and a negative active material associated with change in phase due to charging and discharging,the secondary battery system includes dQ/dV calculation means for calculating, during charging and discharging of the secondary battery, a value for dQ/dV representative of a ratio of dQ to dV where dQ is a variation in storage amount Q of the secondary battery and dV is a variation in battery voltage V of the secondary battery, anda state of the secondary battery system is detected based on a peak appearing on a V−
- dQ/dV curve representative of a relationship between the battery voltage V value and the dQ/dV value.
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Accused Products
Abstract
A secondary battery system includes a secondary battery containing a positive electrode active material configured from lithium manganate having a spinel crystal structure and a negative electrode active material which undergoes a phase change when charging or discharging. The secondary battery system includes a dQ/dV calculation means (battery controller) for calculating dQ/dV, which is the ratio of the change (dQ) in the accumulated energy (Q) in the secondary battery with respect to the change (dV) in the voltage (V) of the secondary battery when charging or discharging the secondary battery, so as to determine the state of the secondary battery system on the basis of the peaks appearing on the V−dQ/dV curve, which expresses the relationship between the voltage (V) and dQ/dV.
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Citations
11 Claims
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1. A secondary battery system comprising a secondary battery, wherein
the secondary battery includes a positive active material formed of lithium manganate having a spinel crystal structure and a negative active material associated with change in phase due to charging and discharging, the secondary battery system includes dQ/dV calculation means for calculating, during charging and discharging of the secondary battery, a value for dQ/dV representative of a ratio of dQ to dV where dQ is a variation in storage amount Q of the secondary battery and dV is a variation in battery voltage V of the secondary battery, and a state of the secondary battery system is detected based on a peak appearing on a V− - dQ/dV curve representative of a relationship between the battery voltage V value and the dQ/dV value.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification