JP7151692B2 - 電池の充電方法および充電システム - Google Patents
電池の充電方法および充電システム Download PDFInfo
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Description
<車両構成>
図1は、本開示の実施の形態に係る充電システムの全体構成を概略的に示す図である。図1を参照して、充電システム1は、車両100と、車両100の外部に設けられた充電設備(充電スタンドなど)900とを備える。
図3は、セル21の構成をより詳細に説明するための図である。図3におけるセル21は、その内部を透視して図示されている。
一般に、ギブスエネルギーGは、エンタルピーH、エントロピーSおよび温度(絶対温度T)を用いて下記式(1)のように表される。なお、リチウムイオン電池におけるエントロピーSは、電池反応(インターカレーション反応)におけるリチウムイオンと電極材料内のサイト(空孔)との配置の自由度に関連するパラメータである。
G=H-TS ・・・(1)
dG=dH-(TdS+SdT) ・・・(2)
dG=VdP-SdT ・・・(3)
(∂G/∂T)p=-S ・・・(4)
ΔS=-d(ΔG)/dT ・・・(5)
ΔG=-nFEemp ・・・(6)
ΔS=nF(dEemp/dT) ・・・(7)
本実施の形態においては、バッテリ2に充電可能な最大電流(以下、「最大充電電流」とも称する)Imaxがバッテリ2のエントロピー変化ΔSに応じて定められる。図4~図7にて説明したように、バッテリ2のエントロピー変化ΔSとSOCとの間の関係を予め求めることが可能である。したがって、バッテリ2のSOCに応じてバッテリ2への最大充電電流Imaxを決定できる。
図9は、本実施の形態におけるバッテリ2の充電方法を示すフローチャートである。このフローチャートは、規定の制御周期が経過する度にメインルーチン(図示せず)から呼び出されて実行される。各ステップは、基本的にはECU10によるソフトウェア処理によって実現されるが、ECU10内に作製された電子回路によるハードウェア処理によって実現されてもよい。以下ではステップを「S」と略す。
続いて、本実施の形態に係るバッテリ2の充電方法を評価するために実施した試験結果について説明する。この評価試験では、SOCを規定値(この例では10%)に調整したバッテリ2を2つ準備した。一方のバッテリ2を一般的な充電パターン(比較例)で繰り返し充電し、もう一方のバッテリ2を本実施の形態における充電パターンで繰り返し充電した。充電の繰り返し数(サイクル数)は100回とした。そして、充電に伴うバッテリ2の劣化の進行度合いをバッテリ2の内部抵抗の変化率(抵抗変化率)によって定量的に評価した。
Claims (6)
- 非水電解液二次電池である電池の充電方法であって、
前記電池の電圧および電流のうちの少なくとも一方に基づいて前記電池のSOCを推定するステップと、
前記電池のSOCと前記電池の電池反応のエントロピー変化との間の関係に基づき、前記電池のエントロピー変化が大きいほど前記電池への充電電流が大きくなるように、前記充電電流を前記電池のSOCに応じて決定するステップとを含む、電池の充電方法。 - 前記決定するステップは、前記電池のエントロピー変化が正であるSOC領域では、前記電池のエントロピー変化が負であるSOC領域と比べて、前記充電電流を大きくするステップを含む、請求項1に記載の電池の充電方法。
- 前記電池のエントロピー変化は、第1のSOC領域では負であり、前記第1のSOC領域よりも高い第2のSOC領域では正であり、前記第2のSOC領域よりもさらに高い第3のSOC領域では負であり、
前記決定するステップは、前記電池のSOCが前記第2のSOC領域に含まれる場合には、前記電池のSOCが前記第1および第3のSOC領域のうちのいずれかに含まれる場合と比べて、前記充電電流を大きくするステップを含む、請求項1または2に記載の電池の充電方法。 - 前記決定するステップは、
前記電池のエントロピー変化が正であるSOC領域では、前記充電電流のCレートを1.5C以上にし、かつ、
前記電池のエントロピー変化が正であるSOC領域における前記充電電流を、前記電池のエントロピー変化が負であるSOC領域における前記充電電流の1.25倍以上にするステップを含む、請求項1~3のいずれか1項に記載の電池の充電方法。 - 非水電解液二次電池である電池の充電方法であって、
前記電池の電圧および電流のうちの少なくとも一方に基づいて前記電池のSOCを推定するステップと、
前記電池のSOCと前記電池の電池反応のエントロピー変化との間の関係に基づき、前記電池への充電電流を前記電池のSOCに応じて決定するステップとを含み、
前記電池のエントロピー変化が第1の値である場合における前記電池への充電電流は、前記電池のエントロピー変化が前記第1の値よりも小さな第2の値である場合における前記充電電流よりも大きい、電池の充電方法。 - 非水電解液二次電池である電池と、
前記電池を充電するように構成された充電装置と、
前記電池への充電電流を制御する制御装置とを備え、
前記制御装置は、
前記電池の電圧および電流のうちの少なくとも一方に基づいて前記電池のSOCを推定し、
前記電池のSOCと前記電池の電池反応のエントロピー変化との間の関係に基づき、前記電池のエントロピー変化が大きいほど前記充電電流が大きくなるように、前記充電電流を前記電池のSOCに応じて決定する、充電システム。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019207256A JP7151692B2 (ja) | 2019-11-15 | 2019-11-15 | 電池の充電方法および充電システム |
EP20206425.9A EP3823078A1 (en) | 2019-11-15 | 2020-11-09 | Method for charging battery and charging system |
CN202011258591.4A CN112820957A (zh) | 2019-11-15 | 2020-11-12 | 电池的充电方法以及充电系统 |
KR1020200150905A KR102526575B1 (ko) | 2019-11-15 | 2020-11-12 | 전지의 충전 방법 및 충전 시스템 |
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