FAILURE DETECTION DEVICE FOR BATTERY PACK

To provide a failure detection device capable of surely detecting open abnormality of a conductive member at an early stage.SOLUTION: The failure detection device comprises: multiple voltage detection lines L1 to L4 each connected to a terminal of a unit battery, which are positioned at both ends of each of the a first pack 21 and a second pack 22 constituting a battery pack 20; multiple switches SW1 to SW4 for switching over the conduction state between one end side and the other end side of the voltage detection lines L1 to L4; a voltage detection part 11 configured to detect a potential difference between a pair of the voltage detection lines L1 to L4; and a failure determination part 12 configured to determine whether any connect failure has occurred between the first pack 21 and the second pack 22 on the basis of a potential difference between the ends of the first and second packs 21, 22 detected by the voltage detection part 11 and a potential difference between the positive end of the first pack 21 and the negative end of the second pack 22.SELECTED DRAWING: Figure 2 【課題】早期且つ確実に、導電部材のオープン異常を検出可能とする故障検出装置を提供すること。【解決手段】組電池２０を構成する第１及び第２の組２１、２２それぞれの両端に位置する前記単位電池の端子に接続された複数の電圧検出ラインＬ１乃至Ｌ４と、当該電圧検出ラインＬ１乃至Ｌ４の一端側と他端側との間の導通状態を切り替える複数のスイッチＳＷ１乃至ＳＷ４と、一対の前記電圧検出ラインＬ１乃至Ｌ４の電位差を検出する電圧検出部１１と、前記電圧検出部１１により検出された前記第１及び第２の組２１、２２それぞれの両端の電位差と、前記第１の組２１の正極端と前記第２の組２２の負極端の電位差とに基づいて、前記第１の組２１と前記第２の組２２の間において接続故障が発生しているか否かを判定する故障判定部１２と、を備える。【選択図】図２