Capacity Maintenance Ratio Determination Device, Battery System And Electric Vehicle
First Claim
1. 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:
- an impedance calculator arranged to calculate frequency characteristics of AC impedance of said battery based on said response signal output from said battery;
a storage arranged to store a relationship between a value of predetermined feature information about a frequency in the frequency characteristics of the AC impedance and the capacity maintenance ratio; and
a determiner arranged to determine the value of the feature information in the frequency characteristics calculated by said impedance calculator, and determine the capacity maintenance ratio corresponding to said determined value of the feature information based on the relationship stored in said storage and the temperature detected by said temperature detector.
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Accused Products
Abstract
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.
28 Citations
9 Claims
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1. 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:
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an impedance calculator arranged to calculate frequency characteristics of AC impedance of said battery based on said response signal output from said battery; a storage arranged to store a relationship between a value of predetermined feature information about a frequency in the frequency characteristics of the AC impedance and the capacity maintenance ratio; and a determiner arranged to determine the value of the feature information in the frequency characteristics calculated by said impedance calculator, and determine the capacity maintenance ratio corresponding to said determined value of the feature information based on the relationship stored in said storage and the temperature detected by said temperature detector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery system comprising:
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a chargeable and dischargeable battery; a signal generator arranged to apply an alternating signal having a plurality of frequency components to said battery; an impedance calculator arranged to calculate frequency characteristics of AC impedance based on a response signal output from said battery in response to said alternating signal; a storage arranged to store a relationship between a value of predetermined feature information about a frequency in the frequency characteristics of the AC impedance and a capacity maintenance ratio; a temperature detector arranged to detect a temperature of said battery; a determiner arranged to determine the value of the feature information in the frequency characteristics calculated by said impedance calculator, and determine the capacity maintenance ratio corresponding to said determined value of the feature information based on the relationship stored in said storage and the temperature detected by said temperature detector; and a communicator for communicating information about the capacity maintenance ratio determined by said determiner. - View Dependent Claims (9)
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Specification