JP7146358B2 - 二次電池の絶縁検査方法 - Google Patents
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Description
この絶縁検査方法として、以下の手法が知られている。即ち、予め充電しておいた電池に外部直流電源を接続して検査回路を構成し、外部直流電源から電池に、この電池の検査直前の検査前電池電圧V0に等しい出力電圧Vb(Vb=V0)を印加し続ける。そして、この検査回路を流れる電源電流Iの電流値Ib(t)が、ほぼ一定の値に収束したら、この収束電流値Ibsを検知する。次に、検知した収束電流値Ibsが予め定めた基準電流値Ibkのよりも大きい場合(Ibs>Ibk)に、当該電池を絶縁性の低い(微小な内部短絡を生じている)不良品と判定する。なお、このような電池の絶縁検査方法に関連する従来技術として、例えば特許文献1,2が挙げられる。
以下、本発明の実施形態を、図面を参照しつつ説明する。図1に本実施形態に係る二次電池1(以下、単に「電池1」ともいう)の斜視図を示す。この電池1は、直方体箱状の電池ケース10と、この内部に収容された扁平状捲回型の電極体20及び電解液15と、電池ケース10に支持された正極端子部材30及び負極端子部材40等から構成されている。本実施形態では、正極活物質として、リチウム遷移金属複合酸化物、具体的にはリチウムニッケルコバルトマンガン酸化物を、負極活物質として、炭素材料、具体的には黒鉛を用いている。
次に、「初充電工程S2」(図2参照)において、組み立てた電池1を初充電する。具体的には、拘束治具(不図示)を用いて、電池1を電池厚み方向に圧縮した状態で拘束する。この拘束状態で初充電工程S2から後述する絶縁検査工程S6まで行う。
次に、「冷却工程S4」(図2参照)において、電池1を環境温度20℃下に放置して、放置冷却することにより、電池温度を20℃とする。
ここで、この初期電荷量Q0の選択方法について説明する。電池1をコンデンサと考えると、電池電圧Vと電池容量Cと電池1に蓄積された電荷量Qとの間で、V=Q/Cの関係が成立する(電池電圧Vは電荷量Qに比例する)はずである。しかし実際には、図3に実線で示す電荷量-電池電圧カーブCLから判るように、電池電圧Vは電荷量Qに比例していない。即ち、図3に破線で示すように、電荷量-電池電圧カーブCLにおける接線の傾きα(Q)=ΔV/ΔQは、電荷量Qの大きさによって変化する。なお、図3に示す傾きα(Q)のグラフは、SOC1%毎に得た電荷量Qと電池電圧Vから、傾きα(Q)=ΔV/ΔQを計算して得たグラフである。
なお、本実施形態では、上述のすべての条件を満たすように、初期電荷量Q0を、電荷量Qの範囲QR3H(QR3b)、具体的にはQ9≦Q≦QF(SOC78%~SOC100%)から選択する。具体的には、この電荷量調整工程S5において、電池1をSOC90%に調整した。
出力電圧Vbの印加開始後(印加継続時間t=0以降)、電圧印加工程S61と並行して、「電流検知工程S62」を行う。即ち、検査回路100を流れる電源電流Iの電流値Ib(t)を検知する。本実施形態では、印加継続時間tが1sec経過する毎に、外部直流電源EPに含まれる電流計EPIによって電流値Ib(t)を検知する。
一方、電流値Ib(t)は、0(零)から印加継続時間tの経過と共に徐々に増加した後、印加継続時間t=収束時間ts以降は、ほぼ一定の値(収束電流値Ibs)となる。但し、良品の電池1に比べて不良品の電池1は、電流値Ib(t)が大きく増加するため、収束電流値Ibsも大きい値となる。
なお、この電流検知工程S62が終了したら、外部直流電源EPから電池1への電圧印加を停止して電圧印加工程S61をも終了する。その後、外部直流電源EPを電池1から離して、更に拘束治具(図示外)による電池1の圧縮を解除する。
例えば、実施形態では、電池1の製造過程において電池1の絶縁検査を行ったが、これに限られない。電池1の絶縁検査は、自動車等に搭載され、或いは単独で市場に置かれた以降の使用済の電池1について行うこともできる。
100 検査回路
S5 電荷量調整工程
S6 絶縁検査工程
Q (電池に蓄電した)電荷量
Q0 初期電荷量
QL 最小傾き電荷量
QR2 (傾きが最小傾きの2倍以上となる電荷量の)範囲
QR2H (電荷量の範囲QR2のうち最小傾き電荷量よりも大きい)範囲
QR3 (傾きが最小傾きの3倍以上となる電荷量の)範囲
QR3H (電荷量の範囲QR3のうち最小傾き電荷量よりも大きい)範囲
C 電池容量
Cp(Q) 局所電池容量
CL 電荷量-電池電圧カーブ
α(Q) (接線の)傾き
αL 最小傾き
I 電源電流
Ib(t) 電流値
EP 外部直流電源
Claims (3)
- 予め定めた初期電荷量Q0を蓄電した二次電池に外部直流電源を接続して、上記外部直流電源から上記二次電池に流れる電源電流が収束する状況により上記二次電池の絶縁性を評価する二次電池の絶縁検査方法において、
上記二次電池についての電荷量Qと電池電圧Vとの関係を示す電荷量-電池電圧カーブにおける接線の傾きα(Q)が最小となる電荷量Qを最小傾き電荷量QLとし、上記最小傾き電荷量QLにおける上記接線の傾きα(QL)を最小傾きαLとしたとき、
上記初期電荷量Q0を、上記傾きα(Q)が上記最小傾きαLの2倍以上(α(Q)≧2αL)となる上記電荷量Qの範囲内から選択する
二次電池の絶縁検査方法。 - 請求項1に記載の二次電池の絶縁検査方法であって、
前記初期電荷量Q0を、前記傾きα(Q)が前記最小傾きαLの3倍以上(α(Q)≧3αL)となる前記電荷量Qの範囲内から選択する
二次電池の絶縁検査方法。 - 請求項1または請求項2に記載の二次電池の絶縁検査方法であって、
前記初期電荷量Q0を、前記最小傾き電荷量QLよりも大きな前記電荷量Qの範囲内から選択する
二次電池の絶縁検査方法。
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JP2020134939A JP7146358B2 (ja) | 2020-08-07 | 2020-08-07 | 二次電池の絶縁検査方法 |
US17/372,897 US11609260B2 (en) | 2020-08-07 | 2021-07-12 | Method for inspecting insulation of a secondary battery |
EP21185744.6A EP3951412B1 (en) | 2020-08-07 | 2021-07-15 | Method for inspecting insulation of a secondary battery |
KR1020210102319A KR102551798B1 (ko) | 2020-08-07 | 2021-08-04 | 이차 전지의 절연 검사 방법 |
CN202110899006.7A CN114062952B (zh) | 2020-08-07 | 2021-08-05 | 二次电池的绝缘检查方法 |
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