To properly control charging of a battery while considering internal resistance of the battery interlocking with IV characteristics of the battery.SOLUTION: A vehicular electric power storage system 50 comprises: a battery BAT; a voltage sensor 12a which detects a voltage value V of the battery BAT; a current sensor 12b which detects a current value I of the battery BAT; and a control device 20 which controls charging of the battery BAT. The control device 20 comprises: a calculation section 21 which calculates the internal resistance of the battery BAT based upon the voltage value V and current value I; a derivation section 22 which derives an estimated value of current internal resistance of the battery BAT based upon the calculated internal resistance value and the current voltage value V; and a setting section 23 which sets a charging power upper-limit value for charging of the battery BAT based upon the derived internal resistance estimated value and the current voltage value V and current value I. The derivation section 22 derives a larger value as the internal resistance estimated value as the difference between an upper-limit voltage value of the battery BAT and the current voltage value V is smaller.SELECTED DRAWING: Figure 1
【課題】バッテリのIV特性と連動する内部抵抗を考慮してバッテリの充電を適切に制御すること。【解決手段】車両用蓄電システム50は、バッテリBATと、バッテリBATの電圧値Vを検出する電圧センサ12aと、バッテリBATの電流値Iを検出する電流センサ12bと、バッテリBATの充電を制御する制御装置20と、を備える。制御装置20は、電圧値Vと電流値Iとに基づきバッテリBATの内部抵抗値を算出する算出部21と、算出された内部抵抗値と現在の電圧値Vとに基づき現在のバッテリBATの内部抵抗推定値を導出する導出部22と、導出された内部抵抗推定値と現在の電圧値V及び電流値Iとに基づきバッテリBATを充電する充電電力上限値を設定する設定部23と、を備える。導出部22は、バッテリBATの上限電圧値と現在の電圧値Vとの差分が小さい程、内部抵抗推定値として大きい値を導出する。【選択図】図1
VEHICULAR ELECTRIC POWER STORAGE SYSTEM
車両用蓄電システム
2023-01-26
Patent
Electronic Resource
Japanese