BATTERY PACK FAULT DETECTION APPARATUS

PROBLEM TO BE SOLVED: To provide a battery pack fault detection apparatus configured to detect breaking in all detection lines.SOLUTION: A battery pack fault detection apparatus operates as follows: storing voltages of battery cells and starting a switching element (S10, S12); determining breaking of a detection line located on the side of an adjacent cell of a battery cell when the voltage is less than a first threshold L and the voltage of the adjacent cell is within a determination range (S14-S18); determining breaking of a detection line located not on the side of the adjacent cell of the battery cell when the voltage is less than the first threshold L and the voltage of the adjacent cell is beyond the determination range (S14, S16, S20); setting a fault flag (S22); transmitting a fail-safe value when two fault flags occur in a row, or transmitting the stored voltage when two fault flags do not occur in a row (S24-S28); and resetting the fault flag when the voltage is not less than the first threshold L, and transmitting the latest voltage (S14, S30, S32). 【課題】本発明は、全ての検出線において断線の有無を検出することのできる組電池の異常検出装置を提供する。【解決手段】各々の電池セルの電圧を記憶し、スイッチング素子を作動させる(S10,S12)。電圧が第１閾値Ｌ未満であり、隣接セルの電圧が判定範囲内にあると、電池セルの隣接セル側の検出線の断線と判定する(S14-S18)。一方で、電圧が第１閾値Ｌ未満であり、隣接セルの電圧が判定範囲内になければ、電池セルの隣接セル側でない側の検出線の断線と判定する(S14,S16,S20)。そして、故障フラグをセットする(S22)。それから、２回連続の故障フラグ発生であれば、フェールセーフ値を送信し、２回連続の故障フラグ発生でなければ、記憶した電圧を送信する(S24-S28)。また、電圧が第１閾値Ｌ未満でなければ、故障フラグをリセットし、最新の電圧を送信する(S14,S30,S32)。【選択図】図２