JP5061907B2 - 電池状態判定方法及び電池状態判定装置 - Google Patents
電池状態判定方法及び電池状態判定装置 Download PDFInfo
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Description
図2に示すように、本実施形態の電池状態判定装置12は、差動増幅回路等を有し鉛電池1の端子間電圧を測定する開回路電圧測定手段の一部、最低電圧測定手段の一部としての電圧センサ3及び鉛電池1の電池状態を判定する記憶手段、負荷演算手段、直流内部抵抗演算手段、状態判定手段としてのマイクロコンピュータ(以下、マイコンという。)10を備えている。
次に、フローチャートを参照して、本実施形態の電池状態判定装置12の動作について、マイコン10のCPUを主体として説明する。マイコン10に電源が投入されると、CPUは、図3に示すように、鉛電池1の電池状態を判定するための電池状態判定ルーチンを実行する。なお、ROMに格納されたプログラムやプログラムデータは、マイコン10への電源投入後の図示しない初期設定処理によりRAMに展開される。
次に、本実施形態の電池状態判定装置12の作用、効果等について説明する。
Claims (9)
- 車両に搭載された鉛電池の電池状態判定方法であって、
前記車両に搭載された鉛電池と同種の無劣化かつ満充電状態の鉛電池(開回路電圧OCV 0 )を複数の電流値で放電させたときの、電圧Vと電流Iとの関係式V=−r 0 ・I+OCV 0 から、実質的に無劣化かつ満充電状態での鉛電池の直流内部抵抗r0を予め求めておき、
前記鉛電池が実質的に無劣化かつ満充電状態において測定した開回路電圧OCV0及びエンジン始動時の最低電圧Vst0、並びに、前記直流内部抵抗r0から、下記式(1)によりエンジン始動時の負荷Rを算出しておき、
前記鉛電池の劣化又は非満充電状態において測定した開回路電圧OCV及びエンジン始動時の最低電圧Vst、並びに、前記算出したエンジン始動時の負荷Rから、下記式(2)により前記鉛電池の直流内部抵抗rを算出し、
前記直流内部抵抗rと前記直流内部抵抗r0とを比較して、前記鉛電池の状態を判定する、
ステップを含む電池状態判定方法。
- 前記鉛電池の状態を判定するステップにおいて、前記直流内部抵抗r0の値に対する前記直流内部抵抗rの値として表される劣化状態判定係数αを演算し、予め定められた前記劣化状態判定係数αと前記鉛電池の健康度(SOH)との対応関係から前記鉛電池の健康度(SOH)を演算することを特徴とする請求項1に記載の電池状態判定方法。
- 前記鉛電池の状態を判定するステップにおいて、前記直流内部抵抗r0の値に対する前記直流内部抵抗rの値として表される劣化状態判定係数αが一定値以上のときに、前記鉛電池の交換を要すると判定することを特徴とする請求項2に記載の電池状態判定方法。
- 車両に搭載された鉛電池の状態判定を行う電池状態判定装置において、
前記車両に搭載された鉛電池と同種の無劣化かつ満充電状態の鉛電池(開回路電圧OCV 0 )を複数の電流値で放電させたときの、電圧Vと電流Iとの関係式V=−r 0 ・I+OCV 0 から求めた、実質的に無劣化かつ満充電状態での鉛電池の直流内部抵抗r0を予め記憶した記憶手段と、
前記鉛電池の開回路電圧を測定する開回路電圧測定手段と、
前記鉛電池のエンジン始動時の最低電圧を測定する最低電圧測定手段と、
前記鉛電池が実質的に無劣化かつ満充電状態において、前記開回路電圧測定手段で測定された開回路電圧OCV0及び前記最低電圧測定手段で測定されたエンジン始動時の最低電圧Vst0、並びに、前記記憶手段に記憶された直流内部抵抗r0から、下記式(1)によりエンジン始動時の負荷Rを演算する負荷演算手段と、
前記鉛電池の劣化又は非満充電状態において、前記開回路電圧測定手段で測定された開回路電圧OCV及び前記最低電圧測定手段で測定されたエンジン始動時の最低電圧Vst、並びに、前記負荷演算手段で演算されたエンジン始動時の負荷Rから、下記式(2)により前記鉛電池の直流内部抵抗rを演算する直流内部抵抗演算手段と、
前記直流内部抵抗演算手段で演算された直流内部抵抗rと前記記憶手段に記憶された直流内部抵抗r0とを比較して、前記鉛電池の状態を判定する状態判定手段と、
を備えた電池状態判定装置。
- 前記記憶手段には、更に、前記直流内部抵抗r0の値に対する前記直流内部抵抗rの値として表される劣化状態判定係数αと前記鉛電池の健康度(SOH)との対応関係を表すマップ又は数式が予め記憶されており、前記状態判定手段は、前記劣化状態判定係数αを演算し、前記記憶手段に記憶されたマップ又は数式による劣化状態判定係数αと健康度との対応関係から前記鉛電池の健康度(SOH)を演算することを特徴とする請求項4に記載の電池状態判定装置。
- 前記状態判定手段は、前記直流内部抵抗r0の値に対する前記直流内部抵抗rの値として表される劣化状態判定係数αが一定値以上のときに、前記鉛電池の交換を要すると判定することを特徴とする請求項5に記載の電池状態判定装置。
- 前記負荷演算手段は演算したエンジン始動時の負荷Rを前記記憶手段に記憶させ、前記直流内部抵抗演算手段は、前記鉛電池の劣化又は非満充電状態において、前記開回路電圧測定手段で測定された開回路電圧OCV及び前記最低電圧測定手段で測定されたエンジン始動時の最低電圧Vst、並びに、前記記憶手段に記憶されたエンジン始動時の負荷Rから、前記式(2)により前記鉛電池の直流内部抵抗rを演算することを特徴とする請求項5に記載の電池状態判定装置。
- 前記記憶手段は不揮発性メモリであることを特徴とする請求項7に記載の電池状態判定装置。
- 前記負荷演算手段は、前記鉛電池によるエンジン始動回数が5回未満であり、前記開回路電圧OCV0が12.5Vを超えるときに、前記鉛電池が実質的に無劣化かつ満充電状態であると判断し、前記エンジン始動時の負荷Rを演算することを特徴とする請求項4に記載の電池状態判定装置。
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KR20210011236A (ko) * | 2019-07-22 | 2021-02-01 | 주식회사 엘지화학 | 배터리 저항 진단 장치 및 방법 |
US11973366B2 (en) | 2020-10-20 | 2024-04-30 | Schumacher Electric Corporation | Battery booster |
KR20220060707A (ko) * | 2020-11-05 | 2022-05-12 | 현대자동차주식회사 | 차량 및 그 제어 방법 |
CN113030743B (zh) * | 2021-02-06 | 2022-11-08 | 广西电网有限责任公司南宁供电局 | 一种基于电池放电行为的阀控铅酸电池状态评价方法 |
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JP2004042799A (ja) * | 2002-07-12 | 2004-02-12 | Shin Kobe Electric Mach Co Ltd | バッテリ残容量推定方法 |
JP2005304176A (ja) * | 2004-04-12 | 2005-10-27 | Matsushita Electric Ind Co Ltd | モータ駆動装置 |
JP2005304173A (ja) * | 2004-04-12 | 2005-10-27 | Shin Kobe Electric Mach Co Ltd | 電池状態検知方法及び電池状態検知装置 |
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