JP6073686B2 - 電池の劣化度の検出方法 - Google Patents
電池の劣化度の検出方法 Download PDFInfo
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Description
劣化度SOH=前回の劣化度SOH1−α(電流値により特定される係数)
−β(温度により特定される係数)
以上の劣化度の検出方法は、電池の保存温度と通電温度から電池の劣化度を検出するので、保存状態と通電状態の両方で正確に劣化度を検出できる。
以上の劣化度の検出方法は、通電温度と電流の両方から電池の劣化度を検出するので、電池の通電においては、より正確に劣化度を検出できる。
以上の劣化度の検出方法は、ΔSOCのみでなく、制限電流を越えた累積時間の両方で劣化度を検出するので、より正確に劣化度を検出できる。
以上の劣化度の検出方法は、ΔSOCに加えて、上限・下限電圧を越えた累積時間をも考慮して劣化度を検出するので、より正確に劣化度を検出できる。
以上の劣化度の検出方法は、電池の劣化度から満充電容量を正確に検出し、検出される満充電容量から電池を正確に一定の残容量範囲にコントロールし、このことによって電池の過充電や過放電を確実に防止して寿命を長くできる特徴がある。
以上の検出方法は、モータに電力を供給する電池の満充電容量を劣化度から検出し、検出される満充電容量から電池の過充電や過放電を防止して劣化を防止して、高価な電池を長寿命に使用できる特徴がある。
以上の検出方法は、太陽電池で充電される電池の満充電容量を劣化度から正確に検出し、検出される満充電容量から電池の過充電や過放電を防止して劣化を防止し、高価な電池を長寿命に使用できる特徴がある。
現在の劣化度SOH(%)=前回の劣化度SOH(%)
−W{ΔSOCにより特定されるウェイト(%)}
実効値(Irms)=[(I1 2+I2 2+I3 2+・・・・+In 2)/n]1/2
劣化度SOH=ウェイト1×劣化度SOH1+ウェイト2×劣化度SOH2
ただし、ウェイト1+ウェイト2=1である。
電池1の開放電圧をVoとし、電流Iのときに電圧をVLとすれば、
VL=Vo−R0×I
この式から、
R0=(Vo−VL)/I で演算される。
[n=1のステップ]
このステップで、判定回路2は内蔵するメモリ7のデータから、劣化度SOH1、劣化度SOH2、劣化度SOHを初期化する。
[n=2のステップ]
このステップで、判定回路2は電池1の電流と電圧から内部抵抗を演算する。このとき、温度によるフィルタリングをして、測定精度を高くする。内部抵抗が温度により変化するからである。温度によるフィルタリングは、電池1の内部抵抗を検出するときの電池温度を検出し、検出される内部抵抗を温度を関数として設定温度における内部抵抗に変換する。内部抵抗をフィルタリングする判定回路2は、温度に対する内部抵抗の変化を、関数として、あるいはルックアップテーブルに記憶している。この記憶値から、内部抵抗を設定温度の内部抵抗にフィルタリングして補正する。
[n=3のステップ]
電池1が充放電される電流と電池温度と、さらに内部抵抗を測定し、これをフィルタリングする。
[n=4のステップ]
1sec経過するまで、n=2〜4のステップをループする。
[n=5のステップ]
1sec経過すると、このステップにおいて、1sec間における電流の実効値(Irms)、平均温度、内部抵抗を演算する。
[n=6のステップ]
このステップで、判定回路2は、1sec間における電流の実効値(Irms)と電池の平均温度から劣化度SOH1を計算する。
[n=7のステップ]
さらに、判定回路2は、記憶しているルックアップテーブルや関数に基づいて、内部抵抗から劣化度SOH2を演算する。
[n=8のステップ]
このステップで、判定回路2は、劣化度SOH1と劣化度SOH2のウェイト1とウェイト2を特定する。ウェイト1とウェイト2は、図6から特定する。
[n=9のステップ]
判定回路2は、ウェイト1及び劣化度SOH1と、ウェイト2及び劣化度SOH2から劣化度SOHを演算する。
[n=10のステップ]
劣化度SOH1を劣化度SOHに近づけるために、演算された劣化度SOHから劣化度SOH1を補正する。
2…判定回路
3…電流検出回路
4…温度検出回路
5…電圧検出回路
6…演算回路
7…メモリ
8…温度センサ
9…通信回線
10…電動車両 10A…ハイブリッドカー
11…双方向電力変換装置
12…モータ
13…発電機
14…制御回路
20…太陽電池
Claims (10)
- 充放電される電池の1回の充電又は1回の放電における残容量の変化量であるΔSOCを検出し、
さらに、ΔSOCの値に対応する劣化度を特定するウェイトをあらかじめ記憶しており、記憶されるデータに基づいて、検出されるΔSOCからウェイトを特定し、特定されるウェイトから電池の劣化度を検出し、
電池に許容される制限電流を記憶し、この制限電流を越えた累積時間を検出して電池の劣化度を検出することを特徴とする電池の劣化度の検出方法。 - 電池の保存温度と通電温度とを検出し、保存温度と通電温度に対応するウェイトをあらかじめ記憶し、記憶されるデータに基づいて、検出される保存温度から特定されるウェイトと、検出される通電温度から特定されるウェイトから電池の劣化度を検出する請求項1に記載される電池の劣化度の検出方法。
- 電池の通電温度と電流とを検出し、通電温度と電流に対応するウェイトをあらかじめ記憶し、記憶されるデータに基づいて、検出される通電温度と電流からウェイトを特定し、特定されるウェイトから電池の劣化度を検出することを特徴とする請求項1または2に記載される電池の劣化度の検出方法。
- 電池の上限・下限電圧を記憶し、この上限・下限電圧を越えた累積時間を検出して電池の劣化度を検出する請求項1ないし3のいずれかに記載される電池の劣化度の検出方法。
- 電池の保存温度範囲ごとに累積時間を記憶し、記憶されたデータに基づいて電池の劣化度を検出する請求項1ないし4のいずれかに記載される電池の劣化度の検出方法。
- 電池の通電温度範囲ごとに累積時間を記憶し、記憶されたデータに基づいて電池の劣化度を検出する請求項1ないし5のいずれかに記載される電池の劣化度の検出方法。
- 電池のΔSOC範囲ごとに累積回数を記憶し、記憶されたデータに基づいて電池の劣化度を検出する請求項1ないし6のいずれかに記載される電池の劣化度の検出方法。
- 電池が、あらかじめ設定している残容量[SOC(%)]の範囲に制御して充放電される用途に使用される請求項1ないし7のいずれかに記載される電池の劣化度の検出方法。
- 電池が、車両を走行させるモータに電力を供給する電池である請求項8に記載される電池の劣化度の検出方法。
- 電池が、太陽電池の電力を蓄える電源に使用される請求項8に記載される電池の劣化度の検出方法。
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JP2008039526A (ja) * | 2006-08-03 | 2008-02-21 | Auto Network Gijutsu Kenkyusho:Kk | 電池劣化診断方法、電池劣化診断装置及びコンピュータプログラム |
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KR20190044256A (ko) * | 2017-10-20 | 2019-04-30 | 현대자동차주식회사 | 차량의 배터리 운용 방법 |
KR102359585B1 (ko) | 2017-10-20 | 2022-02-07 | 현대자동차주식회사 | 차량의 배터리 운용 방법 |
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EP2660615B1 (en) | 2018-11-21 |
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