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CELL DETERIORATION DIAGNOSTIC METHOD AND CELL DETERIORATION DIAGNOSTIC DEVICE meetings

Foreign code F160008867
File No. (S2015-0318-N0)
Posted date Oct 5, 2016
Country WIPO
International application number 2016JP055374
International publication number WO 2016136788
Date of international filing Feb 24, 2016
Date of international publication Sep 1, 2016
Priority data
  • P2015-033944 (Feb 24, 2015) JP
Title CELL DETERIORATION DIAGNOSTIC METHOD AND CELL DETERIORATION DIAGNOSTIC DEVICE meetings
Abstract Provided are a cell deterioration diagnostic method and a cell deterioration diagnostic device which are relatively inexpensive and practical. The cell deterioration diagnostic method for diagnosing the cell deterioration of a secondary cell having transient properties is characterized by including: a charging step for charging a secondary cell; a computation step for integrating a potential difference obtained by subtracting the cell internal voltage V0 from the cell inter-terminal voltage during a process in which the cell inter-terminal voltage of the secondary cell converges on the cell internal voltage V0 of the secondary cell after completion of charging, and calculating the integral value of the potential difference; and a diagnosis step for diagnosing the cell deterioration of the secondary cell on the basis of the integral value.
Outline of related art and contending technology BACKGROUND ART
The secondary battery, particularly a lithium ion secondary battery, since the internal impedance is small, a high current during the short-circuit fault occurs with the risk of causing fire. For this reason, the lithium ion secondary battery, the voltage range of the charge and discharge determined strictly, voltage, current, such as by the device for monitoring the surface temperature of the charge-discharge control is performed, an abnormal operation is suppressed.
Incidentally, the characteristics of the lithium ion secondary battery, also depending on the battery deterioration. However, the protective device is in the degradation of the battery of the lithium ion secondary battery cannot be diagnosed, a protection device is not functional in the lithium ion secondary battery are technical accident such as ignition. Therefore, in order to prevent accidents due to battery deterioration, in order to diagnose the degradation of the battery, a lithium ion secondary battery at a proper timing needs to be replaced.
The degradation of the battery of the lithium ion secondary battery as a method for diagnosing, by the method of using a dedicated instrument superimposed voltage battery deterioration diagnostic method has been known. However, the battery degradation diagnosis method, a dedicated device is expensive, since the lithium ion secondary battery is connected to a device using a detached from the device due to the need, the versatility.
In addition, the lithium ion secondary battery of a battery degradation diagnosis as another method, the voltage of the lithium ion secondary battery is in operation, the internal impedance of the current waveform is derived, based on the internal impedance of the battery deterioration diagnosis method of a battery degradation diagnosis has been known (for example, see Non-Patent Document 1). However, the battery degradation diagnosis method, the charging rate (SOC) of dependency on the large, the problems of accuracy and the like, has not been practical.
Scope of claims (In Japanese)[請求項1]
過渡特性を有する二次電池の電池劣化を診断する電池劣化診断方法であって、
前記二次電池に対して充電を行う充電ステップと、
前記充電の終了後、前記二次電池の電池端子間電圧が前記二次電池の電池内部電圧に収束する過程において、前記電池端子間電圧から前記電池内部電圧を差し引いた電位差を積分し、前記電位差の積分値を算出する演算ステップと、
前記積分値に基づいて前記二次電池の電池劣化を診断する診断ステップと、を含む
ことを特徴とする電池劣化診断方法。
[請求項2]
前記演算ステップでは、前記二次電池の周囲温度の上昇に伴い指数関数的に大きくなる補正関数により、前記積分値の補正を行い、
前記診断ステップでは、補正後の前記積分値に基づいて前記二次電池の電池劣化を診断する
ことを特徴とする請求項1に記載の電池劣化診断方法。
[請求項3]
過渡特性を有する二次電池の電池劣化を診断する電池劣化診断装置であって、
前記二次電池の充電の終了後、前記二次電池の電池端子間電圧が前記二次電池の電池内部電圧に収束する過程において、前記電池端子間電圧から前記電池内部電圧を差し引いた電位差を積分し、前記電位差の積分値を算出する演算部と、
前記積分値の電池劣化特性に関する第1データが格納された記憶部と、
前記演算部で算出された前記積分値と、前記記憶部に格納された前記第1データとに基づいて、前記二次電池の電池劣化を診断する診断部と、を含む
ことを特徴とする電池劣化診断装置。
[請求項4]
前記記憶部には、前記二次電池の周囲温度の上昇に伴い指数関数的に大きくなる補正関数と、前記補正関数により補正された前記積分値の電池劣化特性に関する第2データとが格納されており、
前記演算部は、前記補正関数により前記積分値の補正を行い、
前記診断部は、補正後の前記積分値と前記第2データとに基づいて前記二次電池の電池劣化を診断する
ことを特徴とする請求項3に記載の電池劣化診断装置。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • THE DOSHISHA
  • Inventor
  • NAGAOKA, Naoto
  • YOSHIOKA, Naoyuki
  • NARITA, Naoya
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KN KP KR KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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