JP6081320B2 - 電源装置、及び組電池の制御方法及び制御プログラム - Google Patents
電源装置、及び組電池の制御方法及び制御プログラム Download PDFInfo
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Description
組電池11〜14は、同一構成を有しており、それぞれの組電池11〜14は直列に接続された複数の二次電池セルCLを有している。各二次電池セルCLには放電回路15が並列に接続されている。放電回路15は、複数の二次電池セルCL間の電圧ばらつきを抑制する均等化処理(セルバランス処理)を行う。
電池管理装置60は、電流検出回路(CDC)602と、インタフェース回路604と、アラートシグナルプロセッサ(ASP)605と、電源供給管理部606と、スイッチ駆動回路(SDC)608と、メモリ607と、制御回路(MPU:Micro Processing Unit)CTRと、を備えている。
メモリ(MEM)607は、例えばEEPROM(Electronically Erasable and Programmable Read Only Memory)である。メモリ607は、制御回路CTRの動作を規定するプログラムを記録している。
なお、外部充電器信号CHGが“H”レベルとは、外部充電器信号CHGに対応する供給電力が充電可能な状態を意味している。
以下の説明においては、説明の簡略化のため、3個の二次電池セルCL1〜CL3で構成される組電池11を充電する動作を説明する。各二次電池セルCL1〜CL3の満充電時のセル電圧が2.8Vであり、組電池11全体で満充電時の電圧が8.4Vである。
まず電池管理装置60は、外部充電器信号CHGが“H”レベルとなったことを検出することで充電コネクタCN0に外部充電器200(図3参照)の充電プラグが装着されたことを検出する。
外部充電器200は、コネクタCN1及び充電コネクタCN0を介して、電池管理装置60と接続され、外部充電器信号CHGとしての一定電流値(Cconst)の充電電流CCHGを生成し、供給する定電流充電回路201と、コネクタCN1及び充電コネクタCN0を介して、電池管理装置60と接続され、外部充電器信号CHGとしての一定電電圧値の充電電流CCHGを生成し、供給する定電圧充電回路202と、コネクタCN1及び充電コネクタCN0を介して、電池管理装置60と接続され、電池管理装置60に対して、電池管理装置60から入力される充電制御信号(定電流充電指示信号Scc又は定電圧充電指示信号Scv)に基づいて、定電流充電回路201及び定電圧充電回路202を制御するコントローラ203と、を備えている。
より詳細には、電池管理装置60は、充電方式を、定電流充電(CC充電)とするために、充電制御信号を定電流充電指示信号Sccに設定して、コネクタCN1及びコネクタCN3を介して出力し、外部充電器200のコントローラ203に指示を行う。
そして時刻t3に、最もセル電圧が高い二次電池セルCL1のセル電圧が再び第1電圧V1に至ると(ステップS12;Yes)、電池管理装置60は、全二次電池セルCL1〜CL3が満充電状態(となっているか否かを判別する(ステップS13)。
これにより、組電池11を構成している二次電池セルCL1〜CL3のセル電圧は、時刻t4〜t5の期間に示すように、再び徐々に増加することとなる。
しかしながら、時刻t4〜時刻t5の期間においては、第1電圧V1に至った二次電池セルは存在しないので(ステップS12;No)、電池管理装置60は、再び処理をステップS11に移行し、定電流充電(CC充電)を継続する。
ここにおいても、定電圧値(CV値)は、当該時点における各二次電池セルCLの電圧、または組電池11の電圧に基づいて定める。
この場合において、時刻t6に至るまでは、二次電池セルCL1のセル電圧が第2電圧V2に至ることは無いので(ステップS16;No)、電池管理装置60は、処理を再びステップS14及びステップS15に移行して、同様の処理を繰り返す。
これにより、組電池11を構成している二次電池セルCL1〜CL3の電圧は、時刻t6〜t7の期間に示すように、再び徐々に増加する。
しかしながら、時刻t6〜時刻t7の期間においては、第1電圧V1に至った二次電池セルは存在しないので(ステップS12;No)、電池管理装置60は、再び処理をステップS11に移行し、定電流充電(CC充電)を継続する。
この結果、電池管理装置60は、全二次電池セルCL1〜CL3が満充電状態となっているか否かを判別する(ステップS13)。
そこで、電池管理装置60は、組電池11の充電として定電圧充電(CV充電)を行う(ステップS14)。
ここにおいても、定電圧値(CV値)は、当該時点における各二次電池セルCLの電圧、または組電池11の電圧に基づいて定める。
次に電池管理装置60は、電圧温度監視回路21の電圧検出部213により検出された放電中の二次電池セルCL1及び二次電池セルCL2のセル電圧に基づいて、二次電池セルCL1あるいは二次電池セルCL2のセル電圧が第2電圧V2に至ったか否かを判別する(ステップS16)。
次に電池管理装置60は、電圧温度監視回路21の電圧検出部213により検出された各二次電池セルCL1〜CL3のそれぞれのセル電圧に基づいて、再び第1電圧V1に至った二次電池セルが存在するか否かを判別する(ステップS12)。
図5に示す、時刻t8〜時刻t9の期間においては、第1電圧V1に至った二次電池セルは存在しないので(ステップS12;No)、電池管理装置60は、再び処理をステップS11に移行し、定電流充電(CC充電)を継続する。
15 放電回路
21〜24 組電池監視回路
31 接続ライン
32 接続ライン
33 スイッチ装置
40 インバータ
45 モータ
51 コネクタ
60 電池管理装置
70 外部電源
71 電子制御装置
100 車両
101(1)〜101(4) 組電池モジュール
213 電圧検出部
215 均等化処理部
CL1〜CL3 二次電池セル
CN0 充電コネクタ
CN1、CN2 コネクタ
CSW スイッチ制御信号
CTR 制御回路
Cconst 一定電流値
RD 放電抵抗
SW 放電スイッチ
SWM メインスイッチ
SWP プリチャージスイッチ
TC1 充電端子
V1 第1電圧
V2 第2電圧
Claims (6)
- 直列接続された複数の二次電池セルを有する組電池と、
前記二次電池セルとそれぞれ並列に接続され、対応する二次電池セルの放電を行う複数の放電回路と、
前記組電池に対して定電流充電を行わせ、前記複数の二次電池セルのうち一又は複数の二次電池セルの電圧が所定の第1電圧に至った場合に、前記第1電圧に至った一又は複数の二次電池セルに対応する放電回路を駆動して放電を行わせるとともに、当該組電池に対して定電圧充電を行わせ、前記放電が行われている二次電池セルの電圧が前記第1電圧よりも低い所定の第2電圧に至った場合に、前記放電を停止させ、再び定電流充電を行わせる充電処理を繰り返させる充電制御回路と、
を備えたことを特徴とする電源装置。 - 前記第1電圧は、前記二次電池セルにおける所定の満充電時電圧である、
請求項1記載の電源装置。 - 前記充電制御回路は、前記組電池を構成している全ての前記二次電池セルが前記第1電圧に至るまで前記充電処理を繰り返す、
請求項1または請求項2記載の電源装置。 - 前記充電制御回路は、前記二次電池セルの電圧あるいは前記組電池の電圧に基づいて前記定電圧充電時の定電圧値を設定する、
請求項1乃至請求項3のいずれかに記載の電源装置。 - 直列接続された複数の二次電池セルを有する組電池と、前記二次電池セルとそれぞれ並列に接続され、対応する二次電池セルの放電を行う複数の放電回路と、を備えた電源装置において実行される制御方法であって、
前記組電池に対して定電流充電を行う定電流充電過程と、
前記複数の二次電池セルのうち一又は複数の二次電池セルの電圧が所定の第1電圧に至ったか否かを判別する判別過程と、
前記判別により、前記複数の二次電池セルのうち一又は複数の二次電池セルの電圧が所定の第1電圧に至った場合に、前記第1電圧に至った一又は複数の二次電池セルに対応する放電回路を駆動して放電を行わせるとともに、当該組電池に対して定電圧充電を行わせる定電圧充電過程と、
前記放電が行われている二次電池セルの電圧が前記第1電圧よりも低い所定の第2電圧に至った場合に、前記放電を停止させ、再び定電流充電過程に移行させる充電移行制御過程と、
を備えたことを特徴とする制御方法。 - 直列接続された複数の二次電池セルを有する組電池と、前記二次電池セルとそれぞれ並列に接続され、対応する二次電池セルの放電を行う複数の放電回路と、を備えた電源装置をコンピュータにより制御するための制御プログラムであって、
前記コンピュータを、
前記組電池に対して定電流充電を行わせる定電流充電制御手段と、
前記複数の二次電池セルのうち一又は複数の二次電池セルの電圧が所定の第1電圧に至ったか否かを判別する判別手段と、
前記判別により、前記複数の二次電池セルのうち一又は複数の二次電池セルの電圧が所定の第1電圧に至った場合に、前記第1電圧に至った一又は複数の二次電池セルに対応する放電回路を駆動して放電を行わせるとともに、当該組電池に対して定電圧充電を行わせる定電圧充電制御手段と、
前記放電が行われている二次電池セルの電圧が前記第1電圧よりも低い所定の第2電圧に至った場合に、前記放電を停止させ、再び定電流充電過程に移行させる充電移行制御手段と、
して機能させる制御プログラム。
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