Method and apparatus for determining deterioration of secondary battery, and power supply system therewith

A technology for judging the deterioration of a secondary battery, which is applied in the field of estimating the internal impedance or internal resistance of the secondary battery and judging the deterioration state of the secondary battery, which can solve the problem that it is difficult to accurately estimate the degree of deterioration and discharge capacity.

Active Publication Date: 2008-08-13
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it is known that the impedance of a battery generally depends on the magnitude of the charge and discharge current caused by the above-mentioned normal operation, and it is difficult to accurately estimate the degree of deterioration and discharge capacity in this environment

Method used

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  • Method and apparatus for determining deterioration of secondary battery, and power supply system therewith
  • Method and apparatus for determining deterioration of secondary battery, and power supply system therewith
  • Method and apparatus for determining deterioration of secondary battery, and power supply system therewith

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no. 1 approach

[0149] FIG. 1 is a block diagram showing a battery deterioration state detection and charge state detection device according to a first embodiment of the present invention.

[0150] In FIG. 1, a storage battery 1, a discharge circuit 3 for controlling the current supplied from the storage battery 1 to a load 2, a charging circuit 4 for supplying charging power, and a degradation state detection for measuring the deterioration state during open loop and the charging state and the charging state detection unit 10 are connected.

[0151] The deterioration state detection and charging state detection unit 10 includes: an internal impedance measurement unit 11, which is connected to the positive pole and the negative pole of the storage battery 1, and measures the internal impedance of the storage battery 1; an internal impedance storage unit 12, which stores internal impedance data; an internal impedance correction unit 13, which acquires the internal impedance data from the inter...

no. 2 approach

[0185] 8 is a block diagram showing a storage battery deterioration detection and state of charge detection device according to a second embodiment of the present invention. In FIG. 8, the same reference numerals as those in FIG. 1 denote the same elements.

[0186] In FIG. 8 , storage battery 1 is connected to load 2 via discharge circuit 3 , and is further connected to charging circuit 4 and deterioration state detection and charge state detection unit 30 . In addition, a first ammeter 6 is connected between the charging circuit 4 and the battery 1 , and a second ammeter 7 is connected between the load 2 and the battery 1 .

[0187] As shown in the above-mentioned embodiment, the deterioration state detection and charge state detection unit 30 includes: an internal impedance measurement unit 11; an internal impedance storage unit 12; an internal impedance correction unit 13; an internal impedance calculation unit 14; a battery temperature measurement unit 15; battery temper...

no. 3 approach

[0208] 11 is a block diagram showing a schematic configuration of a vehicle power supply device according to a third embodiment of the present invention. In FIG. 11 , vehicle power supply unit 211 includes a secondary battery 212 , and sensors for measuring current, voltage, and temperature of secondary battery 212 , namely, current sensor 213 , voltage sensor 214 , and temperature sensor 215 . In addition, a discharge circuit 216 , a control unit 217 , and a storage unit 218 are provided for determining the deterioration of the secondary battery 212 .

[0209] The vehicle power supply unit 211 is connected to a load 221 and an alternator 222 including various electrical components of the vehicle, and supplies electric power to the load 221 from the secondary battery 212 or the alternator 222 . The alternator 222 also supplies charging power for charging the secondary battery 212 .

[0210] In vehicle power supply device 211 configured as shown in FIG. 11 , secondary battery ...

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Abstract

A process of obtaining a charge state amount of an accumulator by charge state amount calculation means according to a set value of a degradation state amount and a process of obtaining a degradation state amount of the accumulator by degradation state amount calculation means according to the charge state amount are repeated by a predetermined number of times not smaller than 2. The degradation state amount obtained lastly by repeating the processes by the predetermined number of times is outputted as a degradation state amount output value. The charge state amount obtained lastly is outputted as a charge state amount output value. The degradation state amount output value is stored in a memory.

Description

technical field [0001] The present invention relates to technical fields such as a method for judging the deterioration state of a secondary battery that supplies power to a load, and particularly relates to estimating the internal impedance or internal resistance of a secondary battery, and judging the secondary battery based on the estimation result. The technical field of the secondary battery deterioration judgment method of the deterioration state of the battery, etc. Background technique [0002] As a method of detecting the state of charge of the storage battery, there is, for example, a method of estimating the state of charge by measuring the battery voltage using the relationship (linearity) between the battery voltage and the state of charge described in Patent Document 1 below. [0003] When this method is used, a large fluctuation occurs in the battery voltage due to the influence of the polarization state due to charge or discharge, and thus a stable battery vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/392
Inventor 岩根典靖木村贵史藤村幸司渡边勇一佐藤敏幸岩花史和饭岛崇
Owner FURUKAWA ELECTRIC CO LTD
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