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AssigneeSanyo Electric Co., Ltd.
InventorKazumi OHKURA
Estimating the term…
A capacity maintenance ratio determination device includes an impedance measurement unit and a capacity estimation unit. An alternating signal is applied from a signal generator to a battery. Frequency characteristics of AC impedance are calculated by the impedance measurement unit based on a response signal output from the battery in response to the alternating signal. A feature frequency is determined from the calculated frequency characteristics. The capacity estimation unit includes a memory and a determination unit. A correspondence relationship among a temperature of the battery, the feature frequency and a capacity maintenance ratio is stored in the memory. The determination unit determines the capacity maintenance ratio of the battery based on the temperature of the battery detected by a temperature detector, the determined feature frequency and the correspondence relationship stored in the memory.
A capacity maintenance ratio determination device that determines a capacity maintenance ratio, which is a ratio of a present capacity to a reference capacity, of a chargeable and dischargeable battery based on a response signal output from said battery in response to an alternating signal having a plurality of frequency components applied from a signal generator and based on a temperature of said battery detected by a temperature detector, comprising:
A battery system comprising:
Dependencies are inferred from the claim text.