Battery voltage detection device

A battery voltage detection device for detecting voltages of battery blocks in a battery pack including a plurality of N battery blocks connected in series, comprising:

• a plurality of (N+1) voltage detection terminals connected to the plurality of N battery blocks;
• a first plurality of switches each having an inter-terminal capacitance, the plurality of switches being connected to the respective voltage detection terminals connected to the battery blocks;
• a second switch having an inter-terminal capacitance, to which the first plurality of switches are collectively connected, the first plurality of switches being connected to odd-numbered voltage detection terminals;
• a third switch having an inter-terminal capacitance, to which the first plurality of switches are collectively connected, the first plurality of switches being connected to even-numbered voltage detection terminals;
• a pair of fourth switches connected in series to the second switch and the third switch;
• a capacitor provided between the connection point of the second switch and one of the fourth switches, and the connection point of the third switch and the other of the fourth switches;
• and
• a differential amplifier having input terminals to which the fourth switches are connected.