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Internal impedance detector, internal impedance detecting method, degradation degree detector, and degradation degree detecting method

A technology for detecting equipment and internal impedance, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as uncertain OCV101 values, and achieve high-accuracy results

Inactive Publication Date: 2007-08-01
NEC CORP +1
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  • Abstract
  • Description
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Problems solved by technology

However, the value of OCV 101 is often uncertain

Method used

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  • Internal impedance detector, internal impedance detecting method, degradation degree detector, and degradation degree detecting method
  • Internal impedance detector, internal impedance detecting method, degradation degree detector, and degradation degree detecting method
  • Internal impedance detector, internal impedance detecting method, degradation degree detector, and degradation degree detecting method

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Embodiment Construction

[0079] Embodiments of the present invention will be described below with reference to the drawings.

[0080] FIG. 2 is a block diagram of a degradation degree detection device according to an embodiment of the present invention.

[0081] As shown in FIG. 2 , the degradation degree detection device includes an internal impedance detection device 1 , a calibrator 2 and a degradation degree detector 3 according to an embodiment of the present invention.

[0082] Internal impedance detection device 1 includes: timer 101, voltage detector 102, voltage change detector 103, current detector 104, current change detector 105, processor 106, temperature detector 107, energization direction detector 108, generator 109 . A temperature detector 110 , a temperature change rate detector 111 , an SOC detector 112 and an SOC change rate detector 113 . The generator 109 includes an internal impedance generator 109a, a storage unit 109b, a selector 109c, and an average calculator 109d.

[0083...

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Abstract

An internal impedance detector for detecting the internal impedance of a secondary cell with high accuracy. A computing section (106) divides the variation of each voltage detected by a voltage variation detecting section (103) by the variation of the current detected by a current variation detecting section (105) for the same detecting time as that for the voltage variations to compute the internal impedances. A judging section (107) checks the variations of the internal impedances computed by the computing section (106) and judges from the check result whether or not the internal impedances have reliability. Only when the judging section (107) judges that the internal impedances have reliability, a generating section (109) generates output internal impedance according to the internal impedances.

Description

technical field [0001] The present invention relates to an internal impedance detection device and an internal impedance detection method for a secondary battery, and a degradation degree detection device and a degradation degree detection method for a secondary battery. Background technique [0002] Currently, many hybrid vehicles, electric vehicles or fuel cell vehicles contain secondary batteries as a power source to provide the electric energy required to start the engine and drive the vehicle. [0003] Secondary batteries keep degrading according to the surrounding environment and the way they are used. Generally, when a secondary battery degrades, its internal impedance increases, and its capacity decreases. [0004] When the internal impedance increases, the power supply from the secondary battery is limited. Therefore, the performance of the vehicle using the secondary battery as a power source changes. Therefore, there is a need to detect the degradation state of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3662G01R31/3648G01R31/389G01R31/36
Inventor 石井光德
Owner NEC CORP
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