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Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec

A technology for judging devices and storage batteries, applied to measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as difficulty in battery deterioration

Active Publication Date: 2006-06-21
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, even if the internal impedance of the secondary battery that changes according to the temperature characteristics and usage status is measured, it is difficult to accurately judge the deterioration state of the battery

Method used

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  • Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec
  • Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec
  • Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of sec

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no. 2 Embodiment approach

[0242] The method for judging battery deterioration and the battery deterioration judging device according to the second embodiment of the present invention are capable of accurately judging the discharge performance of a battery (auxiliary battery) used in a device with large load fluctuations or a vehicle-mounted battery (auxiliary battery). The decline, that is, the method and device of the deterioration state of the battery.

[0243] Moreover, it is based on the measurement results at the expected temperature, and under the possible temperature range specified by the specifications of the storage battery as the measurement object, it is judged that the discharge performance of the storage battery is at the most stringent temperature (the lowest temperature range where the performance of the storage battery is most severely degraded) The method and the device of the discharge performance degradation under the temperature). Actually, it is a method and an apparatus for judgi...

no. 1 Embodiment approach

[0353] Figure 3-1 It is a block diagram showing a schematic configuration of the power supply system according to the first embodiment. exist Figure 3-1 Among them, a power supply system including a secondary battery 10, a current sensor 11, a voltage sensor 12, a control unit 13, a storage unit 14, a charging circuit 15, and a discharging circuit 16 is configured to supply electric power from the secondary battery 10 to various loads 20. composition.

[0354] exist Figure 3-1 Among the configurations, as the secondary battery 10 for supplying electric power to the load 20, for example, a battery used in an observation device, a communication device, etc., and a lead storage battery for a vehicle are known. here, in Figure 3-2 The equivalent circuit of the secondary battery 10 is shown in . Such as Figure 3-2 As shown, the secondary battery 10 is respectively equipped with resistors RΩ, Rct1, Rct2, Rct3 and capacitors Cd1, Cd2, Cd3, which can be represented by an eq...

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Abstract

To provide a method for measuring internal impedance of a secondary battery, an charging current or discharging current is used as an input current of the secondary battery, the input current and a response voltage is measured, a plurality of current measuring values and voltage measuring values are obtained on a time line; each frequency components of the input current and the response voltate iscalculated under a predetermining frequency by performing Fourier transform the plurality of current measuring values and the plurality of voltage measuring values; and the ratio of the frequency component of the input current and the frequency component of the response voltage are obtained, and the internal impedance of the secondary battery is calculated under the predetermining frequency.

Description

technical field [0001] The present invention relates to technologies such as a method and device for judging battery deterioration, a method and device for measuring the internal impedance of a secondary battery that supplies power to a load, a method for judging the deterioration state of a secondary battery, and the like field. Background technique [0002] Various methods are known for inspecting the residual capacity and deterioration state of the storage battery. For example, there is a method of completely discharging a storage battery, measuring the capacity, and judging the state of deterioration based on the capacity. However, since this method requires complete discharge, it is difficult to apply to a battery that is connected to a load and is in use, and it is not a practical method because the measurement time is long. Therefore, a method capable of judging the state of deterioration of the storage battery in use in a short time has been developed. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCY02E60/10
Inventor 岩根典靖渡边勇一杉村竹三佐藤敏幸木村贵史岩花史和稻庭克己加纳哲也
Owner FURUKAWA ELECTRIC CO LTD
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