JP7184028B2 - 電力制御システム、電動車両および電力制御方法 - Google Patents
電力制御システム、電動車両および電力制御方法 Download PDFInfo
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Description
<電動車両の全体構成>
図1は、本実施の形態に係る電力制御システムが搭載された電動車両の全体構成を概略的に示す図である。図1を参照して、車両100は、ハイブリッド車両であって、電池パック1と、HVシステム2とを備える。ただし、本開示に係る電動車両は、ハイブリッド車両に限られず、電気自動車または燃料電池車などであってもよい。
図2は、電池パック1の構成をより詳細に説明するための図である。図2を参照して、組電池10は、たとえば、直列接続されたM個のセル101~10Mを含む。Mは2以上の自然数であれば特に限定されないが、典型的には、たとえば十数個~数十個である。
たとえば、ある事業者が別の事業者からHVシステム2を購入し、自身で設計または調達した電池パック1と組み合わせて車両100を開発する状況が考えられる。この場合、電池パック1とHVシステム2との間、すなわち、電池ECU50とHVECU90との間で、どのようなデータをやり取りするかが課題となり得る。電池ECU50からHVECU90に、すべてのセル101~10MのSOCを出力することも考えられる。しかし、事業者によっては、演算負荷および/または通信負荷が重くなることを懸念して、全セルのSOCのやり取り(送受信)は望まない場合がある。
図3は、実施の形態1における組電池10の充放電制御の処理手順を示すフローチャートである。図中左側には電池ECU50により実行される一連の処理を示し、図中左側には、HVECU90により実行される一連の処理を示す。
MIN=AVE-3σ ・・・(2)
なお、±3σの範囲に代えて±2σの範囲によって最高SOC(MAX)および最低SOC(MIN)を算出してもよい。また、統計的ばらつきを表す標準偏差σ以外のパラメータ(たとえば分散)を送受信してもよい。
図5は、組電池10の充放電に使用可能なSOC領域を説明するための図である。図5を参照して、組電池10には使用が許容されたSOC領域が予め定められている。このSOC領域の下限を「許容下限SOC(LL)」または単に「LL」と記載し、上記SOC領域の上限を「許容上限SOC(UL)」または単に「UL」と記載する。一例として、LL=20%であり、UL=80%である。なお、図5では、上記SOC領域外には斜線を付して使用不可であることを表している。
実施の形態1では、すべてのセル101~10Mが正常であるとの前提の下での組電池10の充放電制御を説明した。しかし、セル101~10Mのうちの一部に異常が生じる可能性がある。具体例として、電極に混入した異物(溶接スパッタ、切断カス等)により電極が突き破られることで微小短絡が発生する可能性がある。実施の形態2においては、そのような異常が生じたセル(異常セル)が組電池10に含まれる場合にも対応可能な充放電制御について説明する。
β=AVE-MIN ・・・(5)
さらに、HVECU90は、差分αに対する差分βの比率k(=β/α)を算出する。比率kが所定の基準値REFよりも高い場合(k>REF)、HVECU90は、異常セルが生じていると判定する。この場合には、HVECU90は、実施の形態1にて説明した制御マップMP1(図6参照)とは異なる制御マップMP2を更新する。
Claims (7)
- 電池パックとの間で電力を授受する電力制御システムであって、
前記電池パックは、
複数のセルを含む組電池と、
前記複数のセルの電圧を検出する電圧センサと、
前記複数のセルに入出力される電流を検出する電流センサとを含み、
前記電力制御システムは、
前記組電池を充放電するように構成された電力変換装置と、
前記電力変換装置を制御する制御装置とを備え、
前記電池パックは、前記電圧センサおよび前記電流センサの検出結果から求まる前記複数のセルの間でのSOCばらつきを前記制御装置に出力し、
前記制御装置は、前記電池パックの出力から算出される前記複数のセルのSOCのうちの最高SOCが所定のSOC領域の上限を下回り、かつ、前記複数のセルのSOCのうちの最低SOCが前記SOC領域の下限を上回るように、前記電力変換装置を制御する、電力制御システム。 - 前記制御装置は、
前記最高SOCおよび前記最低SOCのうちの一方と、前記最高SOCと前記最低SOCとの間の差分とに基づいて、前記複数のセルのSOCを単一のSOCに代表させた第1の代表SOCを算出し、
前記第1の代表SOCが前記上限を下回り、かつ、前記第1の代表SOCが前記下限を上回るように、前記電力変換装置を制御する、請求項1に記載の電力制御システム。 - 前記制御装置は、
前記最低SOCが前記下限である場合に、前記第1の代表SOCも前記下限であり、かつ、
前記最低SOCが前記上限から前記差分を差し引いた値である場合に、前記第1の代表SOCが前記上限であり、かつ、
前記第1の代表SOCが前記下限と前記上限との間で単調に増加するように、前記第1の代表SOCを算出する、請求項2に記載の電力制御システム。 - 前記電池パックは、前記複数のセルの平均SOCを前記制御装置にさらに出力し、
前記制御装置は、
前記最高SOCと前記平均SOCとの間の第1の差分に対する前記平均SOCと前記最低SOCとの間の第2の差分の比率が基準値よりも低い場合に、前記第1の代表SOCを算出する一方で、
前記比率が前記基準値よりも高い場合には、
前記最低SOCが前記下限であるときに、第2の代表SOCも前記下限であり、かつ、
前記最低SOCが前記上限であるときに、前記第2の代表SOCも前記上限であり、かつ、
前記第2の代表SOCが前記下限と前記上限との間で単調に増加するように、前記第2の代表SOCを算出し、
前記第2の代表SOCが前記下限を上回るように前記電力変換装置を制御し、
前記最高SOCが前記上限に達したときには、前記組電池への充電を禁止する、請求項3に記載の電力制御システム。 - 請求項1~4のいずれか1項に記載の電力制御システムと、
前記電池パックとを備える、電動車両。 - 電池システムと、
前記電池システムとの間で電力を授受する電力制御システムとを備え、
前記電池システムは、
複数のセルを含む組電池と、
前記複数のセルの電圧を検出する電圧センサと、
前記複数のセルに入出力される電流を検出する電流センサと、
前記電圧センサおよび前記電流センサの検出結果を受ける第1の制御装置とを含み、
前記電力制御システムは、
前記組電池を充放電するように構成された電力変換装置と、
前記電力変換装置を制御する第2の制御装置とを含み、
前記第1の制御装置は、前記電圧センサおよび前記電流センサの検出結果から求まる前記複数のセルの間のSOCばらつきを前記第2の制御装置に出力し、
前記第2の制御装置は、前記第1の制御装置の出力から算出される前記複数のセルのSOCのうちの最高SOCが所定のSOC領域の上限を下回り、かつ、前記複数のセルのSOCのうちの最低SOCが前記SOC領域の下限を上回るように、前記電力変換装置を制御する、電動車両。 - 電池システムと電力制御システムとの間で電力を授受する電力制御方法であって、
前記電池システムは、
複数のセルを含む組電池と、
前記複数のセルの電圧を検出する電圧センサと、
前記複数のセルに入出力される電流を検出する電流センサと、
前記電圧センサおよび前記電流センサの検出結果を受ける第1の制御装置とを含み、
前記電力制御システムは、
前記組電池を充放電するように構成された電力変換装置と、
前記電力変換装置を制御する第2の制御装置とを含み、
前記電力制御方法は、
前記電圧センサおよび前記電流センサの検出結果から求まる前記複数のセルの間でのSOCばらつきを前記第1の制御装置から前記第2の制御装置に出力するステップと、
前記第1の制御装置の出力から算出される前記複数のセルのSOCのうちの最高SOCが所定のSOC領域の上限を下回り、かつ、前記複数のセルのSOCのうちの最低SOCが前記SOC領域の下限を上回るように、前記第2の制御装置により前記電力変換装置を制御するステップとを含む、電力制御方法。
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