JP2010160055A - Battery inspection method - Google Patents

Battery inspection method Download PDF

Info

Publication number
JP2010160055A
JP2010160055A JP2009002494A JP2009002494A JP2010160055A JP 2010160055 A JP2010160055 A JP 2010160055A JP 2009002494 A JP2009002494 A JP 2009002494A JP 2009002494 A JP2009002494 A JP 2009002494A JP 2010160055 A JP2010160055 A JP 2010160055A
Authority
JP
Japan
Prior art keywords
battery
impedance
inspected
inspection method
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2009002494A
Other languages
Japanese (ja)
Inventor
Shinobu Okayama
Takahiro Tsubouchi
隆浩 坪内
忍 岡山
Original Assignee
Toyota Motor Corp
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, トヨタ自動車株式会社 filed Critical Toyota Motor Corp
Priority to JP2009002494A priority Critical patent/JP2010160055A/en
Publication of JP2010160055A publication Critical patent/JP2010160055A/en
Application status is Granted legal-status Critical

Links

Images

Classifications

    • 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 or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel battery inspection method. <P>SOLUTION: In the impedance measurement which passes an AC current through a battery while changing its frequency, so as to measure the impedance of the battery for each frequency, the battery inspection method presets standard impedance as a standard for the impedance of a battery to be obtained by the impedance measurement. On the basis of the impedance of the battery, obtained by the impedance measurement and the standard impedance, the battery is inspected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery inspection method for inspecting a battery. In particular, the present invention relates to an inspection method suitable for a lithium ion secondary battery.

  Lithium ion secondary batteries are becoming increasingly important as on-vehicle power supplies or personal computers and portable terminals. By the way, in the manufacturing process of such a lithium ion secondary battery, various methods for non-destructively inspecting the battery have been proposed. For example, Japanese Patent Application Laid-Open No. 2004-53598 (Patent Document 1) discloses a method of inspecting a battery by measuring the impedance of the battery and fitting it to an equivalent circuit. Further, in Japanese Patent Laid-Open No. 2000-299137 (Patent Document 2), the results of battery impedance measurement are represented by a plot (Cole-Cole plot) on a two-dimensional plane with a real axis component and an imaginary axis component as axes. A method for determining a battery life from an arc locus appearing on the two-dimensional plane is disclosed.

JP 2004-53598 A JP 2000-299137 A

  For example, in the technique disclosed in Patent Document 1 described above, an equivalent circuit as shown in FIG. 1 is selected, and impedance measurement conditions for fitting to the equivalent circuit are determined. The conditions for the equivalent circuit and impedance measurement are determined by the inspector (inspector) so as to meet the inspection purpose. However, such a decision will result in the examiner's work. For this reason, there is a large room for the inspection results to vary greatly depending on the inspector. Further, in order to perform fitting to an equivalent circuit, it is necessary to perform impedance measurement with high accuracy, and therefore, it is necessary to use high-precision equipment for inspection equipment. For this reason, equipment cost may increase. The present invention proposes a new method for battery inspection that is simpler and more appropriate for battery inspection.

  The battery inspection method according to the present invention is based on impedance measurement in which an alternating current is supplied to a battery while changing the frequency and the impedance of the battery is measured for each frequency. The impedance is predetermined. Then, based on the impedance of the battery to be inspected obtained by impedance measurement and the reference impedance, the battery to be inspected is inspected. According to this method, a battery to be inspected can be quantitatively inspected based on a predetermined reference impedance.

The figure which showed an example of the equivalent circuit. The figure which shows typically an example of the battery used as test | inspection object. The figure which showed the result of the impedance measurement on the two-dimensional plane of a Cole-Cole plot. The figure which shows an example of the test result of the battery test method which concerns on one Embodiment of this invention.

  Hereinafter, a battery inspection method according to an embodiment of the present invention will be described with reference to the drawings.

  In the present embodiment, for example, an inspection is performed on a lithium ion secondary battery 100 (hereinafter referred to as “battery 100” as appropriate). For example, as shown in FIG. 2, the lithium ion secondary battery 100 has a structure in which an electrode body 20 is accommodated in a battery case 10 and an electrolytic solution (not shown) is injected into the battery case 10.

  In the present embodiment, impedance measurement is performed on the battery 100. The impedance measurement is a method in which an alternating current is passed through the battery 100 while changing the frequency, and the impedance of the battery 100 is measured for each frequency. Such an impedance measurement is sometimes referred to as a frequency sweep impedance measurement. For example, as shown in FIG. 3, the measurement result of the impedance measurement can be expressed as a plot (Cole / Cole plot) on a two-dimensional plane with the real axis component and the imaginary axis component as axes. . Here, in the impedance measurement, for example, an alternating current may be supplied to the battery 100 at a constant voltage of 10 mV while changing the frequency in the range of 10 kHz to 0.01 Hz under a predetermined temperature environment. It should be noted that the conditions for impedance measurement may be set appropriately by the inspector in consideration of, for example, the type of battery, the specific configuration of the battery, the inspection purpose, and the like.

  In the present embodiment, an alternating current is passed through the battery 100 while changing the frequency in this way, and the impedance of the battery 100 is measured for each frequency. In this case, an impedance (complex impedance) composed of a real part Zi and an imaginary part Zj is obtained for each frequency of the alternating current. In the battery inspection method according to the present embodiment, as shown in FIG. 3, a reference impedance Fo serving as a reference with respect to the impedance of the battery 100 obtained by the impedance measurement is determined in advance. Then, based on the impedance Fx of the battery to be inspected obtained by impedance measurement and the reference impedance Fo, the battery to be inspected is inspected.

  In this case, when the reference impedance Fo and the impedance Fx of the battery to be inspected are represented by a plot (Cole-Cole plot) on a two-dimensional plane with the real axis component and the imaginary axis component as axes, for example, FIG. become that way. Each plot in FIG. 3 shows the reference impedance Fo and the impedance Fx of the battery to be inspected for each frequency of the alternating current for impedance measurement. The positions of the plots are determined by the values of the real part (Zi) and imaginary part (Zj) of the reference impedance Fo and the impedance Fx of the battery to be inspected, respectively.

  Here, the reference impedance Fo is predetermined by the inspector. In the example illustrated in FIG. 3, the reference impedance Fo is determined based on the impedance obtained by impedance measurement for a standard battery determined to be a non-defective product. The reference impedance Fo may be obtained, for example, by measuring impedance of a plurality of non-defective batteries and taking an average value based on the result. In this case, the closer the impedance Fx of the battery to be inspected is to the reference impedance Fo, the higher the possibility that the battery is a non-defective product.

In this case, for example, in the Cole-Cole plot, the battery to be inspected is calculated by calculating the distance between two points of the plot at the same frequency for the impedance Fx of the battery to be inspected and the reference impedance Fo. be able to. Here, the distance Δ | Z | between the two points in the plot at the same frequency can be calculated by, for example, the following equation (1). In Equation (1), Zi FX represents the real part of the plot of the impedance Fx of the battery to be inspected, and Zi FO represents the real part of the plot of the reference impedance Fo. Zj FX represents the imaginary part of the plot of the impedance Fx of the battery to be inspected, and Zj FO represents the imaginary part of the plot of the reference impedance Fo.

  For example, Δ | Z | is calculated for a plurality of frequencies by the above equation (1). As a result, as shown in FIG. 4, a table showing the relationship between the frequency and Δ | Z | is obtained. In this case, the reference impedance Fo is determined based on a non-defective battery, and it is determined that the battery 100 to be inspected is more likely to be non-defective as the value of Δ | Z | is relatively small. .

As another evaluation method, for example, the battery may be evaluated based on the value Δ | Z | H shown in Equation (2). The value Δ | Z | H is a value obtained by dividing the distance between two points Δ | Z | calculated by the equation (1) in the Cole-Cole plot by the distance | Z | FO from the origin of the reference impedance Fo of the frequency. It is. In this case, the distance | Z | FO from the origin of the reference impedance Fo may be obtained by, for example, √ (Zi FO 2 + Zi Fj 2 ). In this case, the distance between two points Δ | Z | varies greatly depending on the frequency. In contrast, a value Δ | Z | H obtained by dividing the distance Δ | Z | between the two points by the distance | Z | FO from the origin of the reference impedance Fo becomes smaller in frequency. According to H, was calculated at different frequencies, the value △ | | such values △ | Z may compare the H | Z. Therefore, in this case, for example, by obtaining the value Δ | Z | H , the battery can be evaluated regardless of the frequency.

  As described above, in this battery inspection method, a reference impedance serving as a reference with respect to the battery impedance obtained by impedance measurement is determined in advance. Then, based on the impedance of the battery to be inspected obtained by impedance measurement and the reference impedance, the battery to be inspected may be inspected. As a result, the impedance of the battery to be inspected is quantitatively evaluated for the battery to be inspected based on the predetermined reference impedance. Further, for example, it is not necessary to select an equivalent circuit, and the influence on the inspection result is reduced by the inspector's work as compared with the conventional method. Further, in this battery inspection method, it is possible to easily determine the measurement conditions for impedance measurement as compared with the case of fitting to an equivalent circuit. Further, the accuracy of impedance measurement does not have to be higher than when fitting to an equivalent circuit. For this reason, equipment costs can be kept low in measuring equipment for impedance measurement.

  Although the battery inspection method according to one embodiment of the present invention has been described above, the battery inspection method according to the present invention is not limited to the above-described embodiment.

  For example, in the example shown in FIG. 3, the reference impedance Fo is obtained based on a standard battery that is determined as a non-defective product by the inspector. The battery was evaluated from the viewpoint of how close the impedance Fx of the battery to be inspected is to the reference impedance Fo. The present invention is not limited to such a method. For example, two reference impedances that define an upper limit and a lower limit that are determined as non-defective items by the inspector are determined, and the battery is evaluated depending on whether or not the impedance Fx of the battery to be inspected is between the two reference impedances. May be.

  Moreover, in embodiment mentioned above, although illustrated as a method of determining whether the battery used as test | inspection object is a non-defective product, the battery test | inspection method concerning this invention is applicable besides this determination. For example, in the measurement of battery impedance, the inspection method according to the present invention can also be applied to a case where a predetermined characteristic of the battery can be evaluated by paying attention to the impedance obtained in a specific frequency range. That is, a reference impedance suitable for evaluating a predetermined characteristic of the battery may be set for the frequency range.

  In the battery inspection method according to the above-described embodiment, the battery to be inspected is exemplified by a lithium ion secondary battery. However, the battery inspection method according to the present invention can be used for other batteries. it can. Examples of the battery to which the battery inspection method according to the present invention can be applied include a nickel metal hydride battery, a nickel cadmium battery, and a lead storage battery.

DESCRIPTION OF SYMBOLS 10 Battery case 20 Electrode body 100 Battery Fo Reference | standard impedance Fx Impedance Zi of the battery used as test object Real part Zj Imaginary part

Claims (1)

  1. A battery inspection method for inspecting a battery,
    For impedance measurement in which an alternating current is passed while changing the frequency to the battery and the impedance of the battery is measured for each frequency, a reference impedance serving as a reference for the impedance of the battery obtained by the impedance measurement is determined in advance,
    A battery inspection method for inspecting a battery to be inspected based on the impedance of the battery to be inspected obtained by the impedance measurement and the reference impedance.
JP2009002494A 2009-01-08 2009-01-08 Battery inspection method Granted JP2010160055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009002494A JP2010160055A (en) 2009-01-08 2009-01-08 Battery inspection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009002494A JP2010160055A (en) 2009-01-08 2009-01-08 Battery inspection method

Publications (1)

Publication Number Publication Date
JP2010160055A true JP2010160055A (en) 2010-07-22

Family

ID=42577320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009002494A Granted JP2010160055A (en) 2009-01-08 2009-01-08 Battery inspection method

Country Status (1)

Country Link
JP (1) JP2010160055A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013044751A (en) * 2011-08-22 2013-03-04 Keithley Instruments Inc Impedance measuring method
KR101288647B1 (en) 2011-01-13 2013-07-22 요코가와 덴키 가부시키가이샤 Secondary battery tester, secondary battery testing method, and manufacturing method of secondary battery
JP2015094726A (en) * 2013-11-13 2015-05-18 学校法人東海大学 Battery-state determination device and battery-state determination method
WO2017094759A1 (en) * 2015-11-30 2017-06-08 積水化学工業株式会社 Method for determining diagnosis frequency, method for diagnosing deterioration of storage cell, system for determining diagnosis frequency, and device for diagnosing deterioration of storage cell

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101288647B1 (en) 2011-01-13 2013-07-22 요코가와 덴키 가부시키가이샤 Secondary battery tester, secondary battery testing method, and manufacturing method of secondary battery
JP2013044751A (en) * 2011-08-22 2013-03-04 Keithley Instruments Inc Impedance measuring method
JP2015094726A (en) * 2013-11-13 2015-05-18 学校法人東海大学 Battery-state determination device and battery-state determination method
WO2017094759A1 (en) * 2015-11-30 2017-06-08 積水化学工業株式会社 Method for determining diagnosis frequency, method for diagnosing deterioration of storage cell, system for determining diagnosis frequency, and device for diagnosing deterioration of storage cell

Similar Documents

Publication Publication Date Title
US20180128881A1 (en) Apparatus and Method for Accurate Energy Device State-of-Charge (SoC) Monitoring and Control using Real-Time State-of-Health (SoH) Data
Weng et al. On-board state of health monitoring of lithium-ion batteries using incremental capacity analysis with support vector regression
US9454888B2 (en) Advanced battery early warning and monitoring system
JP6239241B2 (en) Battery performance estimation method and battery performance estimation apparatus
Berecibar et al. State of health estimation algorithm of LiFePO4 battery packs based on differential voltage curves for battery management system application
US9366732B2 (en) Estimation of state-of-health in batteries
WO2014156869A1 (en) Battery life estimation method and battery life estimation device
US9465077B2 (en) Battery health monitoring system and method
JP5349810B2 (en) Storage device abnormality detection device, method, and program
US9354278B2 (en) Device for detecting normal, abnormal or deteriorated battery state
US8421486B2 (en) Oil-degradation detecting apparatus
KR20120030053A (en) Method for operating a battery
Love et al. State-of-health monitoring of 18650 4S packs with a single-point impedance diagnostic
Blanke et al. Impedance measurements on lead–acid batteries for state-of-charge, state-of-health and cranking capability prognosis in electric and hybrid electric vehicles
Li et al. A quick on-line state of health estimation method for Li-ion battery with incremental capacity curves processed by Gaussian filter
Illig et al. Modeling graphite anodes with serial and transmission line models
JP2009080093A (en) Method and device for detecting internal information of secondary battery
Zhang et al. Battery state estimation using unscented kalman filter
KR20130142884A (en) Inspection system of secondary battery, charge and discharge device, and inspection method
DE102005025449B4 (en) Method and device for measuring a dielectric response of an electrical insulation system
US9548506B2 (en) Fuel cell evaluator and fuel cell evaluation method
JP4107567B2 (en) Lithium-ion battery deterioration diagnosis method and apparatus incorporating the deterioration diagnosis method
JP5850492B2 (en) Battery system and battery evaluation method
JP2000019234A (en) Method and device for measuring capacity of battery using voltage response signal of pulse current
Kindermann et al. Long-term equalization effects in Li-ion batteries due to local state of charge inhomogeneities and their impact on impedance measurements

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20120403