SECONDARY BATTERY DEVICE AND VEHICLE

A secondary battery device comprises a first assembled battery (10(A)) including a plurality of secondary battery cells (BT), a second assembled battery (10(B)) including a plurality of secondary battery cells (BT) and connected in series to a low-potential terminal of the first assembled battery (10(A)), a disconnecting module (SD) capable of mechanically switching connection between the first assembled battery (10(A)) and the second assembled battery (10(B)), a voltage measurement circuit (20) configured to measure voltages of said plurality of secondary battery cells (BT) of the second assembled battery (10(B)), a first power source wiring (W1) connected between a high-potential terminal of the second assembled battery (10(B)) and the voltage measurement circuit (20), a second power source wiring (W2) connected between a low-potential terminal of the second assembled battery (10(B)) and the voltage measurement circuit (20), and a filter (FL1) connected between the first power source wiring (W1) and the second power source wiring (W2).