JP6192738B2 - 電池モジュールおよび組電池 - Google Patents
電池モジュールおよび組電池 Download PDFInfo
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Description
まず、本発明の電池モジュールの実施形態1について説明する。図1は、本実施形態に係る電池モジュール100の概略構成を示す回路図である。
電池モジュール100は、リチウムイオン二次電池である電池200と、該電池200の充放電を制御する制御回路300とを備えている。電池200の正極端子および負極端子は、それぞれ制御回路300およびスイッチS1,S2を介して充電用電源400および外部負荷500に接続されている。
次に、電池モジュール100が備える制御回路300について詳細に説明する。制御回路300は、測定部310、演算部320、閾電圧設定部330、終止電圧設定部340、記憶部350および充放電制御部360を備えている。これらの各部は、単一或いは複数のコンピュータユニットで構成され、例えば通信バス等により構成される入出力部370を介してデータを交換可能に構成されている。
次に、本実施形態の電池モジュール100が備える電池200の構成の一例について、図3を用いて詳細に説明する。図3は、電池200の内部構造を模式的に示した断面図である。
前述の電池モジュール100において、複数の電池200を直列または並列に接続することで、組電池を構成することができる。この場合、個々の電池200にセルコントローラを設ける事が好ましい。セルコントローラは、各電池200の状態を管理するための電子回路装置であり、各電池200に対応して設けられたセル管理用集積回路素子、各電池200の蓄電状態を変更するための回路素子、各電池200の電圧を検出するための回路、フォトカプラなどの絶縁素子、ノイズ除去回路を構成する回路素子、および保護回路を構成する回路素子などが回路基板に実装される構成が一例として挙げられる。このような構成を有する組電池によれば、前述の電池モジュール100と同様の効果を得ることができる。
次に、本発明の電池モジュールの実施形態2について、実施形態1の図1から図7を援用して説明する。
以下、前述の実施形態に係る電池モジュール100を適用可能な電源装置について説明する。図8は、電源装置の一例を示す図であり、ハイブリッド自動車の駆動システムを示すブロック図である。
次に、前述の実施形態の電池モジュール100および組電池を備えた自動車の一例について説明する。図9は、プラグインハイブリッド自動車の概略構成を示す図である。
前述の実施形態1で説明した図3に示す電池200と同様の構成を有するリチウムイオン二次電池を作製した。この際、正極活物質としてLiNi1/3Mn1/3Co1/3O2を用いた。ケイ素系活物質としてのSiOと、天然黒鉛(X線構造解析による黒鉛層間距離(d002)=0.336nm)からなる負極活物質を用いた。また、正極としてアルミニウム箔を、負極として銅箔を用いた。ケイ素系活物質の混合比は2wt%とした。
表1に示す実施例2から実施例12および比較例1から比較例13は、負極活物質中のSiOの混合率および前記式(2)のαを変更したことを除き、実施例1と同様の方法で電池容量維持率を算出した。なお、Si混合率30wt%および65wt%で混合した時には、図2(a)および図4(a)に示す微分値dQ/dVと充電容量Qのグラフの変曲点、すなわちピークP1の位置に合わせて、サイクル時の放電SOCを40%、55%に適宜引き上げた。
Claims (6)
- 負極電極の表面にケイ素系活物質および黒鉛を含む負極合剤層を有するリチウムイオン二次電池と、該リチウムイオン二次電池の充放電を制御する制御回路とを備えた電池モジュールであって、
前記制御回路は、
前記リチウムイオン二次電池の充放電の電圧、電流および時間を測定する測定部と、
前記電圧、電流、および時間に基づいて前記リチウムイオン二次電池の容量Qを算出し、該容量Qを前記電圧Vで微分した微分値dQ/dVを算出する演算部と、
前記黒鉛のステージ構造に基づいて生じる前記微分値dQ/dVの低容量側のピークを特定して、該ピークにおける電圧を閾電圧に設定する閾電圧設定部と、
前記閾電圧に基づいて前記リチウムイオン二次電池の放電終止電圧を設定する終止電圧設定部と、
前記放電終止電圧に基づいて前記リチウムイオン二次電池の充放電を制御する充放電制御部と、
前記閾電圧における前記容量と前記放電終止電圧における前記容量との容量差の最大値が予め記録された記憶部と、を備え、
前記演算部は、前記測定部の測定結果に基づいて前記容量差を算出し、
前記終止電圧設定部は、算出された前記容量差が記録された前記最大値よりも大きい場合に、前記放電終止電圧を、前記閾電圧における容量から前記最大値を減じた容量に対応する電圧に設定することを特徴とする電池モジュール。 - 前記最大値は、前記ケイ素系活物質に基づく容量の20%以下であることを特徴とする請求項1に記載の電池モジュール。
- 前記ケイ素系活物質は酸化ケイ素であり、前記負極合剤層に含まれる該酸化ケイ素と前記黒鉛の合計の質量を100wt%としたときに、前記負極合剤層は、該酸化ケイ素を2wt%以上かつ65wt%以下の比率で含むことを特徴とする請求項2に記載の電池モジュール。
- 前記負極合剤層は、前記酸化ケイ素を10wt%以下の比率で含むことを特徴とする請求項3に記載の電池モジュール。
- 請求項1から請求項4のいずれか一項に記載の電池モジュールと、複数の前記リチウムイオン二次電池とを備えることを特徴とする組電池。
- 個々の前記リチウムイオン二次電池を制御するセルコントローラを備え、該セルコントローラに前記充放電制御部が設けられていることを特徴とする請求項5に記載の組電池。
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