Secondary-battery maximum-capacity measuring apparatus
First Claim
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1. A secondary-battery maximum-capacity measuring apparatus, comprising:
- a current dependency processing unit configured to convert an inter-terminal voltage and an open cell voltage of a secondary battery into values without depending on a load current based on an amount of change in relative value of a voltage during a time period when a constant current is drawn from the secondary battery; and
an error calculation unit configured to compute errors of the inter-terminal voltage and the open cell voltage of the secondary battery, the inter-terminal voltage and the open cell voltage being converted by the current dependency processing unit.
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Abstract
A secondary-battery maximum-capacity measuring apparatus, includes: a current dependency processing unit configured to convert an inter-terminal voltage and an open cell voltage of a secondary battery into values without depending on a load current based on an amount of change in relative value of a voltage during a time period when a constant current is drawn from the secondary battery; and an error calculation unit configured to compute errors of the inter-terminal voltage and the open cell voltage of the secondary battery, the inter-terminal voltage and the open cell voltage being converted by the current dependency processing unit.
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9 Claims
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1. A secondary-battery maximum-capacity measuring apparatus, comprising:
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a current dependency processing unit configured to convert an inter-terminal voltage and an open cell voltage of a secondary battery into values without depending on a load current based on an amount of change in relative value of a voltage during a time period when a constant current is drawn from the secondary battery; and an error calculation unit configured to compute errors of the inter-terminal voltage and the open cell voltage of the secondary battery, the inter-terminal voltage and the open cell voltage being converted by the current dependency processing unit. - View Dependent Claims (2, 3, 4, 5)
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6. A secondary-battery maximum-capacity measuring apparatus, comprising:
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an open cell voltage-waveform calculation unit configured to receive a plurality of pairs of provisional maximum capacity and provisional electric quantity in a secondary battery, and to compute an open cell voltage waveform for each pair based on each pair and a current waveform of the secondary battery; an open cell voltage-waveform extracting unit configured to extract an open cell voltage-derived curve based on the open cell voltage waveform and the current waveform; an inter-terminal voltage-waveform extracting unit configured to extract an inter-terminal voltage-derived curve based on the current waveform and a waveform of an inter-terminal voltage of the secondary battery; an error calculation unit configured to obtain a degree of coincidence between the open cell voltage-derived curve and the inter-terminal voltage-derived curve as an evaluation value; and an optimal value calculation unit configured to output a provisional maximum capacity in a pair of the provisional maximum capacity and the provisional electric quantity in a state where the evaluation value becomes minimum, as a maximum capacity measurement value of the secondary battery. - View Dependent Claims (7, 8, 9)
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Specification