JP2013083522A - Device and method for determining deterioration of secondary cell - Google Patents

Device and method for determining deterioration of secondary cell Download PDF

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Publication number
JP2013083522A
JP2013083522A JP2011223007A JP2011223007A JP2013083522A JP 2013083522 A JP2013083522 A JP 2013083522A JP 2011223007 A JP2011223007 A JP 2011223007A JP 2011223007 A JP2011223007 A JP 2011223007A JP 2013083522 A JP2013083522 A JP 2013083522A
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impedance
value
battery
unit
deterioration
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JP2011223007A
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Japanese (ja)
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Masashi Konno
正史 金野
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K-Engineering Co Ltd
株式会社 ケーエンジニアリング
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

Provided are a secondary battery deterioration determination device and a deterioration determination method capable of accurately determining deterioration regardless of the elapsed time from completion of charging of the secondary battery.
A deterioration determination device 10 determines deterioration of a secondary battery based on an impedance value after completion of charging, and includes an impedance measurement unit 11, a change rate calculation unit 12, a correction unit 13, and a determination unit. 14 and a display unit 15. The correction unit 13 corrects the measured impedance value measured by the impedance measurement unit 11 based on the impedance change rate obtained by the change rate measurement unit 12.
[Selection] Figure 1

Description

  The present invention relates to a deterioration determination device and a deterioration determination method for determining deterioration of a secondary battery based on the impedance value of the secondary battery.

  Generally, it is known that the impedance value of a secondary battery in a fully charged state is correlated with the deterioration state of the secondary battery, and the impedance value changes higher as the deterioration progresses (for example, patents) Reference 1). Based on this characteristic, it is possible to determine the deterioration of the secondary battery by measuring the impedance value of the secondary battery in a fully charged state and comparing it with the impedance value of a non-defective secondary battery that is a criterion for determination. it can.

JP 2001-228226 A

  However, when the deterioration determination is performed by comparing the impedance value of the secondary battery measured immediately after the completion of charging with the determination reference value, there is a problem that the determination accuracy is lowered. This is because the impedance value of the secondary battery temporarily becomes particularly low immediately after the completion of charging. If the impedance value measured at this time is used for determination, the deterioration state of the secondary battery is erroneously determined. I will judge.

  This decrease in determination accuracy can be prevented by measuring the impedance value of the secondary battery not after the completion of charging but after standing for several hours after completion of charging. This is because the impedance value returns from the low state immediately after the completion of charging to the original state after a while after charging is completed.

  Therefore, when determining the deterioration of the secondary battery based on the measured value of the impedance, it is necessary for the measurement operator to leave it for several hours after the charging of the secondary battery is completed and to adjust the measurement conditions. Therefore, the work time for deterioration determination is increased by the amount of time left after charging, and the determination cannot be performed quickly.

  The present invention has been made on the basis of such a problem, and a secondary battery deterioration determination device and a deterioration determination method capable of accurately performing deterioration determination regardless of the elapsed time from the completion of charging of the secondary battery. The purpose is to provide.

  The degradation determination device for a secondary battery according to the present invention determines degradation of a secondary battery based on an impedance value, and is measured by an impedance measurement unit that measures the impedance value of the secondary battery and the impedance measurement unit. Based on the measured impedance value, the rate of change calculation unit for determining the rate of change of impedance, and based on the rate of change of impedance obtained by the rate of change calculation unit, corrects the measured value of impedance measured by the impedance measurement unit. A correction unit for obtaining a correction value of the impedance, and a determination unit for comparing the impedance correction value corrected by the correction unit with the reference value of the impedance serving as a determination reference to determine deterioration of the secondary battery. It is a thing.

  The method for determining deterioration of a secondary battery according to the present invention is for determining deterioration of a secondary battery based on the impedance value after completion of charging of the secondary battery, and measuring the impedance value after completion of charging of the secondary battery. And determining the impedance change rate based on the measured impedance measurement value, correcting the impedance measurement value based on the obtained impedance change rate, obtaining the impedance correction value, and correcting the impedance The method includes a step of comparing the correction value with a reference value of impedance as a reference for determination to determine deterioration of the secondary battery.

  According to the present invention, the measured impedance value is corrected according to the rate of change in impedance, and the impedance correction value is compared with the impedance reference value to determine the deterioration of the secondary battery. Even after waiting for a certain period of time for the impedance value to stabilize after charging is completed, it is possible to accurately estimate the deterioration of the secondary battery by estimating the impedance value after a certain period of time from the measured impedance value immediately after the completion of charging. Can do. Therefore, it is possible to quickly determine the deterioration with high accuracy.

It is a block diagram showing the structure of the deterioration determination apparatus of the secondary battery which concerns on one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the configuration of a secondary battery deterioration determination device 10 according to the present embodiment. The secondary battery deterioration determination device 10 determines the deterioration of the secondary battery based on the impedance value after completion of charging. For example, the impedance measurement unit 11, the change rate calculation unit 12, the correction unit 13, and the like. The determination unit 14 and the display unit 15 are provided. The deterioration determination device 10 of the secondary battery can be used for deterioration determination of various secondary batteries such as a lead storage battery, a nickel / cadmium storage battery, a nickel hydride rechargeable battery, and a lithium secondary battery.

  The impedance measurement unit 11 is connected to, for example, the secondary battery 20 to be determined, and performs continuous measurement for a predetermined time with respect to the impedance value of the secondary battery. The impedance measurement unit 11 is also connected to the change rate calculation unit 12 and the correction unit 13, and outputs measured values of the measured impedance to the change rate calculation unit 12 and the correction unit 13, respectively.

  The rate-of-change calculating unit 12 obtains the rate of change of impedance per unit time from, for example, a continuous impedance measurement value received from the impedance measuring unit 11 for a predetermined time. The change rate calculation unit 12 is also connected to the correction unit 13 and outputs the obtained change rate of impedance to the correction unit 13.

  For example, the correction unit 13 corrects the impedance value at a predetermined time among the measured impedance values for a predetermined time received from the impedance measurement unit 11 based on the change rate of the impedance received from the change rate measurement unit 12. Then, the correction value of the impedance is obtained. For example, the relationship between the impedance value after completion of charging and the time for the secondary battery 20 to be determined is obtained in advance, and the impedance correction value is obtained using the relationship and the obtained impedance change rate. The correction unit 13 is also connected to the determination unit 14, and outputs the obtained impedance correction value to the determination unit 14.

  For example, the determination unit 14 compares the impedance correction value received from the correction unit 13 with the impedance reference value serving as a determination reference to determine the deterioration of the secondary battery 20. The reference value of impedance is set in advance according to the secondary battery 20 to be determined. The determination unit 14 is also connected to the display unit 15 and outputs a determination result to the display unit 15.

  For example, the secondary battery deterioration determination device 10 determines the deterioration of the secondary battery 20 as follows. In the following description, for example, the impedance value of the secondary battery 20 linearly increases after the completion of charging, and the time until stabilization is A, and the impedance reference value that is a criterion for determining the deterioration of the secondary battery 20 is F. A case will be described.

  First, the secondary battery 20 immediately after the completion of charging is connected to the impedance measuring unit 11. The impedance measurement unit 11 measures the impedance for a predetermined time, for example, 5 minutes, and outputs the measurement result to the change rate calculation unit 12 and the correction unit 13. The change rate calculation unit 12 calculates the impedance change rate based on the measured impedance value received from the impedance measurement unit 11, and outputs it to the correction unit 13. For example, the impedance measurement value at the start of measurement is obtained by B, the measurement value of impedance at the end of measurement (for example, after 5 minutes) is obtained by C, and the impedance change rate D is obtained by D = (C−B) / 5 minutes.

  The correcting unit 13 corrects the measured impedance value received from the impedance measuring unit 11 based on the rate of change in impedance received from the rate-of-change measuring unit 12 to a value after stabilization of the impedance, and calculates the obtained impedance correction value. Is output to the determination unit 14. For example, when the impedance value of the secondary battery 20 to be determined increases linearly after completion of charging and the time until stabilization is A, a value D × A obtained by multiplying the impedance change rate D by A is measured. The impedance correction value E = B + D × A is obtained by adding to the measured impedance value B at the start.

  The determination unit 14 compares the impedance correction value E received from the correction unit 13 with the impedance reference value F. For example, if the impedance correction value E is greater than or equal to the impedance reference value F, If the impedance correction value E is smaller than the impedance reference value F, the product is determined to be non-defective. The determination unit 14 outputs the determination result to the display unit 15, and the display unit 15 displays the determination result.

(Example)
About the nickel hydride rechargeable battery which deteriorated, deterioration determination was performed using the deterioration determination apparatus 10 of the secondary battery mentioned above. In this nickel-metal hydride battery, the impedance value increases linearly after completion of charging, and the time A until the impedance value stabilizes is 120 minutes. The impedance correction value E is obtained by the above-described relational expression. It is done. The reference value F for impedance was 1000 mΩ.

  First, the secondary battery 20 immediately after completion of charging was connected to the impedance measuring unit 11, and the impedance was measured by the impedance measuring unit 11 for 5 minutes. The measured value B of impedance at the start of measurement was 800 mΩ, and the measured value C of impedance after 5 minutes was 825 mΩ. Next, based on the measured values B and C of the impedance, the change rate calculation unit 13 obtained the change rate D of the impedance. As a result, the impedance change rate D was D = (C−B) / 5 minutes = (825 mΩ−800 mΩ) / 5 minutes = 5 mΩ / min.

  Subsequently, the correction unit 13 added the value D × A obtained by multiplying the impedance change rate D by A to the impedance measurement value B at the start of measurement to measure the impedance correction value. As a result, the correction value E for impedance was E = B + D × A = 800 mΩ + (5 mΩ / min × 120 minutes) = 800 mΩ + 600 mΩ = 1400 mΩ.

  After that, the determination unit 14 compares the impedance correction value E = 1400 mΩ with the impedance reference value F = 1000 mΩ, and performs deterioration determination. As a result, the impedance correction value E was larger than the impedance reference value F.

  Further, when the impedance of the same secondary battery 20 was measured 120 minutes after the completion of charging, the impedance value was 1380 mΩ.

  As described above, the measured values B and C of the impedance immediately after the completion of charging are 800 mΩ and 825 mΩ, both of which are smaller than the impedance reference value F of 1000 mΩ. On the other hand, according to the present embodiment, since the impedance measurement value is corrected based on the impedance change rate D, the impedance correction value E is 1400 mΩ, which is measured after 120 minutes from the completion of charging. A value that is the same as the impedance value after stabilization was obtained, and correct deterioration judgment could be performed.

  As described above, according to the present embodiment, the measured value of the impedance is corrected according to the rate of change of the impedance, and the deterioration value of the secondary battery 20 is determined by comparing the corrected value of the impedance with the reference value of the impedance. Therefore, even after waiting for a certain period of time for the impedance value to stabilize after charging is completed, the impedance value after a certain period of time is estimated from the measured impedance value immediately after completion of charging, and the secondary battery is accurately obtained. Can be determined. Therefore, it is possible to quickly determine the deterioration with high accuracy.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made. For example, although the correction method in the correction unit 13 has been specifically described in the above embodiment, it can be obtained by another method according to the characteristics of the secondary battery 20 to be determined. Moreover, although the case where the impedance measurement unit 11 continuously measures the impedance value of the secondary battery for a predetermined time has been described in the above embodiment, the measurement may be performed a plurality of times with a predetermined time interval.

  It can be used for determining the deterioration of the secondary battery.

  DESCRIPTION OF SYMBOLS 10 ... Degradation determination apparatus, 11 ... Impedance measurement part, 12 ... Change rate calculation part, 13 ... Correction | amendment part, 14 ... Determination part, 15 ... Display part

Claims (2)

  1. A deterioration determination device that determines deterioration of a secondary battery based on an impedance value,
    An impedance measuring unit for measuring the impedance value of the secondary battery;
    Based on the measured impedance value measured by the impedance measurement unit, a change rate calculation unit for obtaining a change rate of impedance,
    Based on the rate of change of impedance obtained by the rate of change calculation unit, a correction unit for correcting the measured value of impedance measured by the impedance measurement unit, and obtaining a correction value of impedance,
    A deterioration of a secondary battery, comprising: a determination unit that compares the impedance correction value corrected by the correction unit with a reference value of an impedance serving as a determination reference to determine deterioration of the secondary battery. Judgment device.
  2. A deterioration determination method for determining deterioration of a secondary battery based on an impedance value after completion of charging of the secondary battery,
    Measuring the impedance value after the secondary battery is fully charged;
    A step of obtaining a rate of change in impedance based on the measured impedance value;
    Correcting the measured impedance value based on the obtained impedance change rate, and obtaining a corrected impedance value;
    A method for determining deterioration of a secondary battery, comprising: comparing a corrected value of the corrected impedance with a reference value of impedance serving as a reference for determination, and determining deterioration of the secondary battery.
JP2011223007A 2011-10-07 2011-10-07 Device and method for determining deterioration of secondary cell Pending JP2013083522A (en)

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Citations (14)

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JPH01129177A (en) * 1987-11-13 1989-05-22 Japan Storage Battery Co Ltd Battery state detector
JPH0593684A (en) * 1991-05-29 1993-04-16 Ketsuto Kagaku Kenkyusho:Kk Method and apparatus for measuring estimated moisture content in infrared moisture meter
JPH0815079A (en) * 1994-07-01 1996-01-19 Toyota Motor Corp Instrument and method for measuring pressure leakage
JPH08111941A (en) * 1994-10-07 1996-04-30 Sony Corp Charging controller
US5751217A (en) * 1996-02-01 1998-05-12 Motorola, Inc. Method and apparatus for assessing available battery life in a rechargeable battery
JP2002330547A (en) * 2001-04-27 2002-11-15 Internatl Business Mach Corp <Ibm> Electric apparatus for determining battery life, computer device, battery life determination system, battery, and battery life detection method
JP2005037233A (en) * 2003-07-14 2005-02-10 Furukawa Battery Co Ltd:The Capacity estimation method for storage battery
JP2006308540A (en) * 2005-03-29 2006-11-09 Citizen Watch Co Ltd Electronic thermometer
JP2007057379A (en) * 2005-08-24 2007-03-08 Nissan Motor Co Ltd Internal resistance detection method of secondary battery
JP2007271438A (en) * 2006-03-31 2007-10-18 Furukawa Battery Co Ltd:The Method and device for estimating life of lead-acid battery
JP2009133675A (en) * 2007-11-29 2009-06-18 Sony Corp Battery pack and method of calculating internal impedance
JP2010139260A (en) * 2008-12-09 2010-06-24 Hitachi Ltd System of estimating remaining life of secondary battery and method for estimating remaining life thereof
JP2011058961A (en) * 2009-09-10 2011-03-24 Nissan Motor Co Ltd Battery control apparatus and method of estimating internal resistance of battery
US20110221392A1 (en) * 2010-03-11 2011-09-15 Ford Global Technologies, Llc Vehicle and method of diagnosing battery condition of same

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129177A (en) * 1987-11-13 1989-05-22 Japan Storage Battery Co Ltd Battery state detector
JPH0593684A (en) * 1991-05-29 1993-04-16 Ketsuto Kagaku Kenkyusho:Kk Method and apparatus for measuring estimated moisture content in infrared moisture meter
JPH0815079A (en) * 1994-07-01 1996-01-19 Toyota Motor Corp Instrument and method for measuring pressure leakage
JPH08111941A (en) * 1994-10-07 1996-04-30 Sony Corp Charging controller
US5751217A (en) * 1996-02-01 1998-05-12 Motorola, Inc. Method and apparatus for assessing available battery life in a rechargeable battery
JP2002330547A (en) * 2001-04-27 2002-11-15 Internatl Business Mach Corp <Ibm> Electric apparatus for determining battery life, computer device, battery life determination system, battery, and battery life detection method
JP2005037233A (en) * 2003-07-14 2005-02-10 Furukawa Battery Co Ltd:The Capacity estimation method for storage battery
JP2006308540A (en) * 2005-03-29 2006-11-09 Citizen Watch Co Ltd Electronic thermometer
JP2007057379A (en) * 2005-08-24 2007-03-08 Nissan Motor Co Ltd Internal resistance detection method of secondary battery
JP2007271438A (en) * 2006-03-31 2007-10-18 Furukawa Battery Co Ltd:The Method and device for estimating life of lead-acid battery
JP2009133675A (en) * 2007-11-29 2009-06-18 Sony Corp Battery pack and method of calculating internal impedance
JP2010139260A (en) * 2008-12-09 2010-06-24 Hitachi Ltd System of estimating remaining life of secondary battery and method for estimating remaining life thereof
JP2011058961A (en) * 2009-09-10 2011-03-24 Nissan Motor Co Ltd Battery control apparatus and method of estimating internal resistance of battery
US20110221392A1 (en) * 2010-03-11 2011-09-15 Ford Global Technologies, Llc Vehicle and method of diagnosing battery condition of same

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