Patent ID: 8616311

Claim:
An electrical storage device comprising: a plurality of conductive battery house casings electrically connected to a chassis; a plurality of battery cells housed and held in the battery house casings; and a control unit that is disposed outside the battery house casings and comprises a circuit that monitors a state of the plurality of battery cells, wherein: the circuit comprises a terminal for grounding; and a conductive base of the control unit is directly fixed to the battery house casings and the terminal for grounding of the circuit is electrically connected to the battery house casings through the base so as to ground the circuit to the chassis; wherein a battery assembly constituted with the plurality of battery cells is housed in the plurality of battery house casings, wherein: the base is mounted astride the plurality of battery house casings and is directly fixed to each of the plurality of the battery house casings; and the terminal is electrically connected to the plurality of the battery house casings through the base so as to be grounded to the chassis.