JP7100151B2 - 電池制御装置 - Google Patents
電池制御装置 Download PDFInfo
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Description
図1は、本発明の一実施形態に係る電池システム100とその周辺の構成を示す図である。電池システム100は、リレー300,310を介してインバータ400に接続される。電池システム100は、組電池110、単電池管理部120、電流検知部130、電圧検知部140、組電池制御部150、記憶部180を備える。
次に、本発明の第2の実施形態について説明する。本実施形態では、電池の劣化を考慮して上限電流値を決定する例を説明する。なお、本実施形態に係る電池システムの構成は、組電池制御部150に替えて組電池制御部150aを有する点以外は、第1の実施形態で説明した図1の電池システム100と同様である。以下では、この組電池制御部150と150aの差分点を中心に、本実施形態の内容を説明する。
次に、本発明の第3の実施形態について説明する。本実施形態では、第2の実施形態とは異なる、電解液中のリチウムイオン濃度(沖合いの濃度C*)が低下するような劣化モードをさらに考慮して上限電流値を決定する例を説明する。なお、本実施形態に係る電池システムの構成は、組電池制御部150に替えて組電池制御部150bを有する点以外は、第1の実施形態で説明した図1の電池システム100と同様である。以下では、この組電池制御部150と150bの差分点を中心に、本実施形態の内容を説明する。
次に、本発明の第4の実施形態について説明する。本実施形態では、第3の実施形態とは異なる方法により、リチウムイオン濃度が低下した電池に対する充放電制御を行う例を説明する。なお、本実施形態に係る電池システムの構成は、組電池制御部150に替えて組電池制御部150cを有する点以外は、第1の実施形態で説明した図1の電池システム100と同様である。以下では、この組電池制御部150と150cの差分点を中心に、本実施形態の内容を説明する。
110:組電池
111:単電池
112:単電池群
120:単電池管理部
121:単電池制御部
122:電圧検出回路
123:制御回路
124:信号入出力回路
125:温度検知部
130:電流検知部
140:電圧検知部
150,150a,150b,150c:組電池制御部
151:電池状態検知部
152,152a,152b:上限電流演算部
153,153c:充放電可能電力演算部
154:イオン濃度推定部
155:制限率設定部
160:信号通信手段
170:絶縁素子
180:記憶部
200:車両制御部
300~330:リレー
400:インバータ
410:モータジェネレータ
1521,1521b:界面濃度推定部
1522:拡散層推定部
1523:濃度勾配推定部
1524,1524a:上限電流決定部
1541:電圧差実効値演算部
1542:電圧差閾値演算部
1543:電圧差比率演算部
1544:イオン濃度演算部
1554:制限率演算部
Claims (11)
- 二次電池に流れる電流、または前記電流および前記二次電池の温度に基づいて、前記二次電池の電極と電解質との界面付近に形成される拡散層におけるイオン濃度勾配を推定する濃度勾配推定部と、
前記イオン濃度勾配に基づいて前記二次電池の上限電流値を決定する上限電流決定部と、を備え、
前記上限電流決定部は、前記イオン濃度勾配に応じた前記二次電池の過電圧が所定の範囲内となるように、前記上限電流値を決定する電池制御装置。 - 請求項1に記載の電池制御装置において、
前記上限電流決定部は、前記二次電池の内部抵抗のうち前記イオン濃度勾配に応じた抵抗成分の割合が所定の範囲内となるように、前記上限電流値を決定する電池制御装置。 - 請求項1に記載の電池制御装置において、
前記上限電流決定部は、前記二次電池の充電電力または放電電力が最大となるように、前記上限電流値を決定する電池制御装置。 - 請求項3に記載の電池制御装置において、
前記上限電流決定部は、前記二次電池の通電時間の経過に応じて前記上限電流値を低下させるように、前記上限電流値を決定する電池制御装置。 - 請求項1に記載の電池制御装置において、
前記界面におけるイオン濃度を推定する界面濃度推定部と、
前記拡散層の厚さを推定する拡散層推定部と、を備え、
前記濃度勾配推定部は、前記界面濃度推定部が推定した前記界面におけるイオン濃度と、前記拡散層推定部が推定した前記拡散層の厚さとに基づいて、前記イオン濃度勾配を推定する電池制御装置。 - 請求項1~5のいずれか一項に記載の電池制御装置において、
前記上限電流決定部が決定した前記上限電流値に基づいて、上限電流通電時の前記二次電池の電圧を推定し、推定した前記電圧および前記上限電流値に基づいて、前記二次電池の充電可能電力および放電可能電力を推定する充放電可能電力演算部を備える電池制御装置。 - 請求項1~6のいずれか一項に記載の電池制御装置において、
前記上限電流決定部は、前記二次電池の劣化状態に基づいて前記上限電流値を変化させる電池制御装置。 - 請求項1~7のいずれか一項に記載の電池制御装置において、
前記二次電池のイオン濃度を推定するイオン濃度推定部を備え、
前記上限電流決定部は、前記イオン濃度の変化に基づいて前記上限電流値を変化させる電池制御装置。 - 請求項8に記載の電池制御装置において、
前記イオン濃度推定部は、前記二次電池の過電圧または電流の実効値に基づいて前記イオン濃度を推定する電池制御装置。 - 請求項6に記載の電池制御装置において、
前記充放電可能電力演算部は、前記二次電池のイオン濃度の変化に応じて前記充電可能電力または前記放電可能電力を変化させる電池制御装置。 - 請求項10に記載の電池制御装置において、
前記二次電池の過電圧または電流の実効値に基づいて前記二次電池のイオン濃度の変化に応じた制限率を設定する制限率設定部を備え、
前記充放電可能電力演算部は、前記制限率設定部が設定した前記制限率に基づいて、前記充電可能電力または前記放電可能電力を変化させる電池制御装置。
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