A battery system comprising: a plurality of battery cells (V1-V7) electrically connected to each other; a plurality of cell voltage sensing lines (200, cs1-cs8), each of them connected to an end of a battery cell of the plurality of battery cells; a battery management system for sensing voltages of the plurality of battery cells through the respective cell voltage sensing line; a plurality of fuses (400, F1-F8), each of them connected to one of the plurality of cell voltage sensing lines to cut off a flow of an excessive current exceeding a rated current when the excessive current flows through two of the cell voltage sensing lines due to a short circuit between the two cell voltage sensing lines; and a plurality of emergency preventing switches (T2-T8), each of them connected to one of the plurality of cell voltage sensing lines in series with the fuse of the respective cell voltage sensing line, so that each of the plurality of battery cells is connected to the battery management system through the series arrangement of the respective voltage sensing line, the respective fuse and the respective emergency preventing switch, wherein a gate of each one of the plurality emergency preventing switches connected to one cell voltage sensing line is connected to another cell voltage sensing line having a lower potential than that of the one cell voltage sensing line, such that each one of the plurality of emergency preventing switches is turned on when a low voltage is applied to the gate of each one of the plurality of emergency preventing switches, and each one of the plurality of emergency preventing switches is turned off when a high voltage is applied to the gate of each one of the plurality of emergency preventing switches, wherein the plurality of battery cells are electrically connected in series, so that an order of potentials can be defined from a cell voltage sensing line having the lowest potential to a cell voltage sensing line having the highest potential according to which one of the plurality of battery cells the respective cell voltage sensing line is connected to, wherein a fusing time of the fuse connected to one cell voltage sensing line is longer than a fusing time of the fuse connected to any other cell voltage sensing line having a lower potential than that of the one cell voltage sensing line. a plurality of battery cells (V1-V7) electrically connected to each other; a plurality of cell voltage sensing lines (200, cs1-cs8), each of them connected to an end of a battery cell of the plurality of battery cells; a battery management system for sensing voltages of the plurality of battery cells through the respective cell voltage sensing line; a plurality of fuses (400, F1-F8), each of them connected to one of the plurality of cell voltage sensing lines to cut off a flow of an excessive current exceeding a rated current when the excessive current flows through two of the cell voltage sensing lines due to a short circuit between the two cell voltage sensing lines; and a plurality of emergency preventing switches (T2-T8), each of them connected to one of the plurality of cell voltage sensing lines in series with the fuse of the respective cell voltage sensing line, so that each of the plurality of battery cells is connected to the battery management system through the series arrangement of the respective voltage sensing line, the respective fuse and the respective emergency preventing switch, wherein a gate of each one of the plurality emergency preventing switches connected to one cell voltage sensing line is connected to another cell voltage sensing line having a lower potential than that of the one cell voltage sensing line, such that each one of the plurality of emergency preventing switches is turned on when a low voltage is applied to the gate of each one of the plurality of emergency preventing switches, and each one of the plurality of emergency preventing switches is turned off when a high voltage is applied to the gate of each one of the plurality of emergency preventing switches, wherein the plurality of battery cells are electrically connected in series, so that an order of potentials can be defined from a cell voltage sensing line having the lowest potential to a cell voltage sensing line having the highest potential according to which one of the plurality of battery cells the respective cell voltage sensing line is connected to, wherein a fusing time of the fuse connected to one cell voltage sensing line is longer than a fusing time of the fuse connected to any other cell voltage sensing line having a lower potential than that of the one cell voltage sensing line.