JP5516588B2 - 組電池の充電状態検出装置および充電状態検出方法 - Google Patents
組電池の充電状態検出装置および充電状態検出方法 Download PDFInfo
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Description
このようにすると、電池ブロック間でのSOCばらつきが大きくなって、制御下限値から制御上限値までの制御範囲とばらつき量がほぼ等しくなったときには、過充電をより優先的に防止するように、組電池の全体SOCを設定できる。
たとえば、図12に示した、電池電圧(特に開放電圧)に対するSOC−電圧特性510に照らして、一定周期毎に電池電圧VbからブロックSOCを逐次算出できる。あるいは、電池電流Ibの積算値や電池温度Tbを加味して、ブロックSOCを算出してもよい。なお、図12のSOC−電圧特性510に照らせば、本実施の形態において、「状態検出値」は少なくとも電池電圧(Vb)を含む。
図4には、本発明の実施の形態による全体SOCの設定の概念図が示される。
式(1)では、電池ブロック間でのSOCばらつきを反映して、可動範囲に対する現在のブロックSOCの分布が定量的に評価される。
分布状態403aでは、(1)式よりα=0となるので、式(2)よりSOC♯=SOClに設定されることが理解される。また、分布状態403bでは、(1)式よりα=1.0となるので、式(2)よりSOC♯=SOCuに設定されることが理解される。
Claims (8)
- 直列接続された複数の電池セル(221)を有する組電池(220)の充電状態検出装置であって、
前記複数の電池セルは、各々が少なくとも1個の前記電池セルを有する複数の電池ブロック(BB(1)−BB(n))に分割され、
前記充電状態検出装置は、
前記複数の電池ブロックのそれぞれでの状態検出値に基づいて、前記複数の電池ブロックのそれぞれに対応した複数の蓄電量推定値(BSOC(1)−BSOC(n))を算出するように構成された蓄電量推定部(312(1)−312(n))と、
前記複数の蓄電量推定値に基づいて、前記組電池の全体蓄電量推定値(SOC♯)を設定するように構成された全体蓄電量設定部(315)とを備え、
前記全体蓄電量設定部は、
前記複数の蓄電量推定値のうちの最大値(BSmax)が制御上限値(SOCu)より高い第1のケース(401)では、前記全体蓄電量推定値を前記制御上限値より高く設定する一方で、前記複数の蓄電量推定値のうちの最小値(BSmin)が制御下限値(SOCl)より低い第2のケース(402)では、前記全体蓄電量推定値を前記制御下限値より低く設定し、かつ、前記複数の蓄電量推定値の全てが前記制御下限値以上かつ前記制御上限値以下で定義される制御範囲に入っている第3のケース(403)では、現在の前記複数の蓄電量推定値の分布に基づいて前記全体蓄電量推定値を前記制御範囲内の値に設定するように構成され、
前記全体蓄電量設定部(315)は、前記最大値(BSmax)および前記最小値(BSmin)の差に従ってばらつき量(DBS)を算出するとともに、前記制御範囲の広さを示す制御幅(WSOC)から前記ばらつき量を減算した第1の値に対する、前記最大値から前記ばらつき量および前記制御下限値を減算した第2の値の比に従って、現在の前記複数の蓄電量推定値(BSOC(1)−BSOC(n))が前記制御範囲のどこに位置するかを示すパラメータ(α)を求めるとともに、当該パラメータおよび前記制御幅の乗算値と前記制御下限値(SOCl)との和に従って、前記全体蓄電量推定値(SOC♯)を設定するように構成される、組電池の充電状態検出装置。 - 前記全体蓄電量設定部(315)は、前記第3のケース(403)では、前記最小値(BSmin)が前記制御下限値(SOCl)に等しいケース(403a)において前記全体蓄電量推定値(SOC♯)を前記制御下限値に設定する一方で、前記最大値(BSmax)が前記制御上限値(SOCu)に等しいケース(403b)において前記全体蓄電量推定値を前記制御上限値に設定するように構成される、請求項1記載の組電池の充電状態検出装置。
- 前記全体蓄電量設定部(315)は、前記最大値(BSmax)および前記最小値(BSmin)の差に従うばらつき量(DBS)が所定値より大きいときには、前記最大値に従って前記全体蓄電量推定値(SOC♯)を設定するように構成される、請求項1または2に記載の組電池の充電状態検出装置。
- 前記所定値は、前記制御範囲の広さを示す制御幅(WSOC)から所定の安全代を減算した値に設定される、請求項3記載の組電池の充電状態検出装置。
- 直列接続された複数の電池セル(221)を有する組電池(220)の充電状態検出方法であって、
前記複数の電池セルは、各々が少なくとも1個の前記電池セルを有する複数の電池ブロック(BB(1)−BB(n))に分割され、
前記充電状態検出方法は、
前記複数の電池ブロックのそれぞれでの状態検出値に基づいて、前記複数の電池ブロックのそれぞれに対応した複数の蓄電量推定値(BSOC(1)−BSOC(n))を算出するステップ(S100)と、
前記複数の蓄電量推定値のうちの最大値(BSmax)および最小値(BSmin)、を求めるステップ(S110)と、
前記複数の蓄電量推定値に基づいて、前記組電池の全体蓄電量推定値(SOC♯)を設定するステップ(S130,S140)とを備え、
前記設定するステップは、前記最大値が制御上限値(SOCu)より高い第1のケース(401)では、前記全体蓄電量推定値を前記制御上限値より高く設定する一方で、前記最小値が制御下限値(SOCl)より低い第2のケース(402)では、前記全体蓄電量推定値を前記制御下限値より低く設定し、かつ、前記複数の蓄電量推定値の全てが前記制御下限値以上かつ前記制御上限値以下で定義される制御範囲に入っている第3のケース(403)では、現在の前記複数の蓄電量推定値の分布に基づいて前記全体蓄電量推定値を前記制御範囲内の値に設定し、
前記求めるステップ(S110)は、前記最大値(BSmax)および前記最小値(BSmin)の差に従ってばらつき量(DBS)をさらに求め、
前記設定するステップ(S130,S140)は、
前記制御範囲の広さを示す制御幅(WSOC)から前記ばらつき量を減算した第1の値に対する、前記最大値から前記ばらつき量および前記制御下限値を減算した第2の値の比に従って、現在の前記複数の蓄電量推定値(BSOC(1)−BSOC(n))が前記制御範囲のどこに位置するかを示すパラメータ(α)を求めるステップ(S130)と、
前記パラメータおよび前記制御幅の乗算値と前記制御下限値(SOCl)との和に従って、前記全体蓄電量推定値(SOC♯)を算出するステップ(S140)とを含む、組電池の充電状態検出方法。 - 前記設定するステップ(S130,S140)は、前記第3のケース(403)では、前記最小値(BSmin)が前記制御下限値(SOCl)に等しいケース(403a)において前記全体蓄電量推定値(SOC♯)を前記制御下限値に設定する一方で、前記最大値(BSmax)が前記制御上限値(SOCu)に等しいケース(403b)において前記全体蓄電量推定値を前記制御上限値に設定する、請求項5記載の組電池の充電状態検出方法。
- 前記求めるステップ(S110)は、前記最大値(BSmax)および前記最小値(BSmin)の差に従ってばらつき量(DBS)をさらに求め、
前記充電状態検出方法は、
前記ばらつき量が所定値より大きいときに、前記最大値に従って前記全体蓄電量推定値(SOC♯)を設定するステップ(S150)をさらに備える、請求項5または6に記載の組電池の充電状態検出方法。 - 前記所定値は、前記制御範囲の広さを示す制御幅(WSOC)から所定の安全代を減算した値に設定される、請求項7記載の組電池の充電状態検出方法。
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