The voltage measurement unit 120 may measure a voltage of each battery cell to calculate a measured voltage value of each cell. The voltage measurement unit 120 performs monitoring by measuring a voltage of each cell in a preset constant period interval, and here, a descriptions will be provided by referring to a voltage value measured in a current period N as a first measurement voltage value, and a voltage value measured in a next period (N+1) after the current period N as a second measurement voltage value.

The voltage measurement unit 120 may deliver the first measurement voltage value to the first control unit 130, and the second measurement voltage value to the second control unit 150.

Here, the voltage measurement unit 120 may be the same component for performing the same function as that of the typical battery monitoring IC 12 shown in FIG. 1.

The first control unit 130 may compare the first measurement voltage value of each cell delivered from the voltage measurement unit 120 with a prescribed first reference voltage value, which is a reference for determining occurrence of the overvoltage. When the first measurement voltage value of at least one cell among the battery cells is equal to or greater than the prescribed first reference voltage value, it may be determined that overvoltage occurs in the corresponding cell. As described above, when the first measurement voltage value of the at least one cell is determined to be overvoltage, a cutoff signal for cutting off a further inflow of a charge current to the battery cells may be generated to be output to the cutoff unit 140.