INTERNAL RESISTANCE MEASURING SYSTEM, INTERNAL RESISTANCE MEASURING DEVICE AND INTERNAL RESISTANCE MEASURING METHOD

To measure the internal resistance of a battery that is chargeable by avoiding a discharge path in which abnormality exists.SOLUTION: An internal resistance measuring system comprises: a measurement unit that measures the voltage of a chargeable battery and a current flowing from the battery in a plurality of discharge paths that include a switch connected to the battery and a resistive element connected in series to the switch and that cause the battery to be discharged when the switch is on; a determination unit that determines the presence of abnormality in the discharge paths on the basis of the current value measured in the discharge paths by the measurement unit when the switch is off and the current value measured in the discharge paths by the measurement unit when the switch is on; and an internal resistance calculation unit that causes the battery to be discharged in a prescribed discharge pattern in a discharge path having been determined to be free of abnormality by the determination unit, and calculates the internal resistance value of the battery from the voltage and current that are measured by the measurement unit when the battery has been discharged in the discharge pattern.SELECTED DRAWING: Figure 3 【課題】異常のある放電経路を回避して充電可能なバッテリの内部抵抗の測定を行う。【解決手段】内部抵抗測定システムは、充電可能なバッテリの電圧と、前記バッテリに接続されたスイッチと前記スイッチに直列に接続された抵抗素子とを含み前記スイッチがオンのときに前記バッテリを放電させる複数の放電経路で前記バッテリから流れる電流とを測定する測定部と、前記放電経路で前記スイッチがオフのときに前記測定部が測定した電流値と、前記放電経路で前記スイッチがオンのときに前記測定部が測定した電流値に基づいて前記放電経路の異常の有無を判定する判定部と、前記判定部で異常がないと判定された前記放電経路で前記バッテリを所定の放電パターンで放電させ、前記放電パターンで前記バッテリの放電が行われているときに前記測定部が測定した電圧と電流とから前記バッテリの内部抵抗値を算出する内部抵抗算出部と、を備える。【選択図】図３