JP4987581B2 - 電池制御装置 - Google Patents
電池制御装置 Download PDFInfo
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- JP4987581B2 JP4987581B2 JP2007158997A JP2007158997A JP4987581B2 JP 4987581 B2 JP4987581 B2 JP 4987581B2 JP 2007158997 A JP2007158997 A JP 2007158997A JP 2007158997 A JP2007158997 A JP 2007158997A JP 4987581 B2 JP4987581 B2 JP 4987581B2
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Description
図1−1は、本発明の一つの実施例である実施例1の構成を示す説明図である。実施例1では、電気を蓄え放電可能な蓄電池101と、蓄電池101a〜dを複数直列接続して構成される電池モジュール102と、蓄電池101の充電状態や異常状態などを管理する管理手段103と、電池モジュール102の端子間の電圧を計測する電圧計測手段104と、電池モジュール102に出入りする電流を計測する電流計測手段105と、管理手段103、電圧計測手段104と電流計測手段105からの情報に基づいて、蓄電池101又は電池モジュール102の状態を検知する状態検知手段106と、状態検知手段106が行った状態検知結果に基づいて、電池モジュール102を使用するインバータ107と、インバータ107に接続されて動作を行うモータジェネレータ(M/G)108と、状態検知手段106から送信される情報に基づきインバータを動作させる電流制御手段109とを備える。
電池システム200は、組電池100、セルコントローラ120、バッテリコントローラ130及びセンサなどから構成されている。実際の製品では、組電池100及びセルコントローラ120は1つの電池モジュール102として構成され、バッテリコントローラ130、センサ及び冷却装置などの他の構成部品と共に1つの筐体内に収納されている。
SOC=MAP(OCV) (2)
ここで、OCVは電池モジュール102の起電力、CCVは電圧計測手段104で取得した電池モジュール102の端子間電圧、Iは無負荷時又は充放電時に電流計測手段105で計測した電流値、Rは予め求めて状態検知手段106に持たせたか、又はリアルタイムに求めた電池モジュール102の内部抵抗、Vpは分極電圧である。
SOC=SOC0+100×∫I dt/Qmax (3)
ここで、SOC0は充放電開始時のSOCの初期値、Qmaxは蓄電池101又は電池モジュール102の満充電時の容量である。
SOHは、電池モジュール102の劣化状態を示す値である。電池モジュール102が劣化すると、内部抵抗が上昇、又は満充電時の容量が低下するなど特性に変化が生じる。これら劣化で変化した特性又はこの変化した特性と初期特性との比率から、SOHを求める方法が一般的である。演算したSOHは、他の演算に反映させて劣化情報を考慮に入れた電池モジュール102の状態検知を行うこともできるし、更に電池モジュール102の寿命を判定する際の指標として用いることもできる。本実施例では、電池モジュール102の劣化が進行するにしたがい、SOHの値は上昇するものとして定義する。
ICHG=(Vmax−OCV)/Rz (4)
IDIS=(OCV−Vmin)/Rz (5)
ここで、Rzは電池モジュール102のインピーダンスである。図4に示すように、インピーダンスは電池モジュール102の温度又はSOCなどに応じて異なってくるため、電池モジュール102の状態に応じたRzを予め求めて使用するか、前記各種計測手段によって電池モジュール102のデータを取得し、Rzをリアルタイムに求めると、電池の状態に応じた精度の良い最大許容電流を得ることができる。図5に示すように、求めた最大許容充電電流は高SOCとなるほど小さくなり、低SOCとなるほど大きくなる。また、最大許容放電電流は高SOCとなるほど大きくなり、低SOCとなるほど小さくなる。インバータ107は受信した最大許容充電電流の範囲内で電池モジュール102を充電し、最大許容放電電流の範囲内で電池モジュール102を放電する充放電制御を行う。
ICHG=(Vmax−OCV)/(SOH×Rz) (6)
IDIS=(OCV−Vmin)/(SOH×Rz) (7)
SOHを求めた結果、SOHの値が上昇すると、上記の(6)式と(7)式の分母(SOH×Rz)が大きくなる。このため、求まるICHG及びIDISは、SOHの上昇に応じて小さな値となり、電池モジュール102が劣化した場合でも確実にVmaxとVminを超えない範囲内の充電電流と放電電流を求めることができる。これを最大許容電流としてインバータ107側に送信し、インバータ107は受信した最大許容電流の範囲内で電池モジュール102を使用することで、初期状態から劣化状態にかけて確実に電池モジュール102を充電又は放電させることができる。また、前述したSOH演算と最大許容電流演算は、管理手段103を用いて各蓄電池101のものを求め、これにより充電又は放電制御することも可能である。
図9は、本発明の実施例2の構成を示す説明図である。実施例2は、実施例1の管理手段103が備えるID111と状態検知手段106が備えるID´112とを用いることなく、最大許容電流又は電力を制御する電池制御装置である。
Claims (6)
- 複数の単電池を接続して構成する電池モジュールと、前記電池モジュールに設置される管理回路であって前記電池モジュールを識別するためのIDを記憶するための管理回路と、前記電池モジュールの状態を検知する状態検知回路であって初期状態において前記管理回路に記憶されたIDとは一致することのないIDを記憶した状態検知回路と、を備える電池システムであって、
前記状態検知回路は、前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが一致しない場合、前記電池モジュールの充放電を制限する機能を備えると共に、
前記状態検知回路は、検知した電池モジュールの劣化状態を示す値が所定の条件を満たした場合、前記制限を解除すると共に、前記管理回路に記憶されたIDを、前記状態検知回路のIDとして記憶することを特徴とする電池システム。 - 請求項1に記載の電池システムにおいて、
前記状態検知回路に記憶されたIDが、前記管理回路に記録されたIDと異なる場合、前記劣化状態が異なると判断することを特徴とする電池システム。 - 複数の単電池が接続されて構成された電池モジュールと、前記電池モジュールに対応して設けられ前記電池モジュールを識別するためのIDが記憶された管理回路と、前記電池モジュールの状態を検知するために設けられた回路であって電池モジュールを識別するためのIDが記憶された状態検知回路と、を有する電池システムであって、
前記状態検知回路は、前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが不一致の場合、前記電池モジュールの充放電を制限させるための機能を備えており、
前記状態検知回路には予め前記電池モジュールを識別するためのIDとは異なるIDが記憶され、前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが不一致となり、前記状態検知回路が前記制限を機能させるように構成されていると共に、検知した前記電池モジュールの劣化状態を示す値が所定の条件を満たしたら、前記状態検知回路が前記制限を解除し、前記状態検知回路に記憶されたIDが前記管理回路に記憶されたIDに書き直されるように構成されている、
ことを特徴とする電池システム。 - 複数の単電池を接続して構成する電池モジュールと、前記電池モジュールに設置される管理回路であって前記電池モジュールを識別するためのIDを記憶するための管理回路と、前記電池モジュールの状態を検知する状態検知回路であって初期状態において前記管理回路に記憶されたIDとは一致することのないIDを記憶した状態検知回路と、を備える電池システムの制御方法であって、
前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが一致しない場合、前記状態検知回路が前記電池モジュールの充放電を制限するステップと、
前記状態検知回路は、検知した電池モジュールの劣化状態を示す値が所定の条件を満たした場合、前記制限を解除すると共に、前記管理回路に記憶されたIDを、前記状態検知回路のIDとして記憶するステップと、
を有することを特徴とする電池システムの制御方法。 - 請求項4に記載された電池システムの制御方法において、
前記状態検知回路に記憶されたIDが、前記管理回路に記憶されたIDと異なる場合、前記劣化状態が異なると判断することを特徴とする電池システムの制御方法。 - 複数の単電池が接続されて構成された電池モジュールに対応して設けられた回路であって前記電池モジュールを識別するためのIDが記憶された管理回路、及び前記電池モジュールの状態を検知するための回路であってIDが記憶された状態検知回路と、を備え、前記状態検知回路は、前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが一致しない場合、前記電池モジュールの充放電を制限させるための機能を備えている電池システムの制御方法であって、
前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとを比較する第1ステップと、
前記第1ステップの比較の結果、両者のIDが不一致の場合、前記状態検知回路が前記電池モジュールの充放電の制限を機能させる第2ステップと、
前記第2ステップによる制限動作の間、前記電池モジュールの劣化状態を検知し、前記劣化状態を示す値が所定の条件を満たすかどうか判定する第3ステップと、
前記第3ステップの判定の結果、前記劣化状態を示す値が所定の条件を満たす場合、前記制限を解除する第4ステップと、
前記第4ステップによって前記制限が解除された場合、前記状態検知回路に記憶されたIDを前記管理回路に記憶されたIDに書き直す第5ステップと、を有し、
予め前記状態検知回路には、前記状態検知回路に記憶されたIDと前記管理回路に記憶されたIDとが一致せず、前記制限が機能するように、前記電池モジュールを識別するためのIDとは異なるIDが記憶されている、
ことを特徴とする電池システムの制御方法。
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