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Battery state detection device

A technology of battery status and detection device, which is applied to battery circuit devices, measurement devices, circuit devices, etc., can solve the problems of secondary battery deterioration and reduction of rechargeable capacity, and achieve the effect of easy detection.

Inactive Publication Date: 2016-03-09
YAZAKI CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It is known that such a secondary battery deteriorates with repeated charging and discharging, and its chargeable capacity gradually decreases (current capacity, power capacity, etc.)

Method used

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Examples

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no. 1 example

[0049] will be referred to below Figures 1 to 6 A battery state detection device according to a first embodiment of the present invention will be described.

[0050] figure 1 A schematic configuration of a battery state detection device according to an embodiment of the present invention is shown. figure 2 A graph plotting the internal complex impedance of the secondary battery in a predetermined frequency range on the complex plane is schematically shown. image 3 schematically shows the figure 1 An example of the waveform of the secondary charging current output by the charging unit of the battery state detection device.

[0051]The battery state detection device is installed on the electric vehicle and connected between electrodes of a secondary battery provided in the electric vehicle to detect the state SOH (state of health) as the secondary battery, which is, for example, the current chargeable capacity and the initial The ratio of chargeable capacity. In addition...

no. 2 example

[0114] Hereinafter, a battery state detection device according to a second embodiment of the present invention will be described.

[0115] In the battery state detection device according to the second embodiment, instead of the internal complex impedance of the secondary battery B, the SOH of the secondary battery B is detected by using the value (magnitude) of the internal impedance. Specifically, the second embodiment is similar to the first embodiment except for the process of detecting the internal complex impedance of the secondary battery B ( Figure 5 Step T140) and the processing of detecting the SOH of the secondary battery B ( Figure 4 Step S170) is different from that in the first embodiment. Thus, only the parts different from the first embodiment will be described below.

[0116] In the foregoing first embodiment, by using the plurality of internal complex impedances z1, z2, and z3 corresponding to the detection frequencies f1, f2, and f3, the distance |OA| fro...

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Abstract

Provided is a battery state detection device capable of accurately and relatively easily detecting the state of a secondary battery. In this battery state detection device (1), a muCOM (40) detects multiple internal complex impedances (z1, z2, z3) corresponding to multiple discrete detection frequencies (f1, f2, f3) in the secondary battery (B) and detects the SOH of the secondary battery (B) on the basis of the detected multiple internal complex impedances (z1, z2, z3). Further, the multiple frequencies (f1, f2, f3) corresponding to the multiple internal complex impedances (z1, z2, z3) detected by the muCOM (40) are distributed to two partial frequency ranges corresponding to each of the multiple partial graphs (K1, K2) which indicate the state of the multiple component parts of the secondary battery (B) in a graph (K) plotting in the complex plane the internal complex impedances across a prescribed frequency range of the secondary battery (B).

Description

technical field [0001] The present invention relates to a battery state detection device for detecting the state of a secondary battery. Background technique [0002] For example, various vehicles such as an electric vehicle (EV) that runs using an electric motor and a hybrid vehicle (HEV) that runs using both an engine and an electric motor mounted thereon are equipped with batteries such as lithium-ion rechargeable batteries and nickel-metal hydride rechargeable batteries. A secondary battery such as a rechargeable battery is used as a power source for the motor. [0003] It is known that such a secondary battery deteriorates with repeated charging and discharging, and its chargeable capacity (current capacity, power capacity, etc.) gradually decreases. In an electric vehicle or the like using a secondary battery, the chargeable capacity is derived by detecting the degree of deterioration of the secondary battery to calculate the number of times of operation of the second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/48H02J7/00
CPCH01M10/48G01R31/367G01R31/392G01R31/389H02J7/007Y02E60/10H01M10/4285
Inventor 高桥信之
Owner YAZAKI CORP
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