A battery pack has a plurality of battery stacks, a case, and a thermal insulation cover. The case accommodates the plurality of battery stacks. The thermal insulation cover is arranged so as to expose an outer surface of at least one battery stack from among the plurality of battery stacks inside the case, and to cover an outer surface of a battery stack that is adjacent to the exposed battery stack. A difference obtained by subtracting an amount of removed heat from an amount of heat generated during heat generation is greater in the battery stack that is exposed from the thermal insulation cover than in the battery stack that is covered by the thermal insulation cover.

A battery pack has a plurality of battery stacks, a case, and a thermal insulation cover. The case accommodates the plurality of battery stacks. The thermal insulation cover is arranged so as to expose an outer surface of at least one battery stack from among the plurality of battery stacks inside the case, and to cover an outer surface of a battery stack that is adjacent to the exposed battery stack. A difference obtained by subtracting an amount of removed heat from an amount of heat generated during heat generation is greater in the battery stack that is exposed from the thermal insulation cover than in the battery stack that is covered by the thermal insulation cover.

A battery pack including a plurality of battery cells arranged along a first direction; a holder, the holder including terminal holes exposing terminals of the battery cells, and pairs of first plates separated from each other between adjacent terminal holes and pairs of elastic pieces that are bent from the pairs of first plates in opposite directions along the first direction; and bus bars, each of the bus bars including coupling portions at opposite sides thereof and coupled to adjacent terminal holes, and a central bent portion connecting the coupling portions and extending around corresponding pairs of elastic pieces to surround the corresponding pairs of elastic pieces.

A battery pack including a plurality of battery cells arranged along a first direction; a holder, the holder including terminal holes exposing terminals of the battery cells, and pairs of first plates separated from each other between adjacent terminal holes and pairs of elastic pieces that are bent from the pairs of first plates in opposite directions along the first direction; and bus bars, each of the bus bars including coupling portions at opposite sides thereof and coupled to adjacent terminal holes, and a central bent portion connecting the coupling portions and extending around corresponding pairs of elastic pieces to surround the corresponding pairs of elastic pieces.

A battery pack includes: a battery cell including a terminal surface on which an electrode terminal is located, a bottom surface opposite the terminal surface, and a lateral surface between the terminal surface and the bottom surface; a first tank facing the terminal surface of the battery cell; a second tank extending from the first tank and facing the lateral surface of the battery cell; and a third tank extending from the second tank and facing the bottom surface of the battery cell, and a cavity is defined in the first and second tanks to extend across the first and second tanks, the cavity being filled with a first cooling medium and being fluidically isolated from an outside of the battery pack; and a flow path is defined in the third tank to receive a flow of a second cooling medium which is different from the first cooling medium.

A stack has an end surface located at an end portion in a first direction. A restraint portion includes a first member, a second member, and an adhesive agent layer. The first member has a main body portion and a protrusion portion. The protrusion portion protrudes from the main body portion in a second direction intersecting the first direction. The second member is provided with a recess portion that receives at least a portion of the protrusion portion in the second direction. The adhesive agent layer adheres the first member and the second member to each other. One of the first member and the second member is provided to face the end surface of the stack. The protrusion portion and the recess portion are engaged with each other with the adhesive agent layer being interposed between the protrusion portion and the recess portion.

A stack has an end surface located at an end portion in a first direction. A restraint portion includes a first member, a second member, and an adhesive agent layer. The first member has a main body portion and a protrusion portion. The protrusion portion protrudes from the main body portion in a second direction intersecting the first direction. The second member is provided with a recess portion that receives at least a portion of the protrusion portion in the second direction. The adhesive agent layer adheres the first member and the second member to each other. One of the first member and the second member is provided to face the end surface of the stack. The protrusion portion and the recess portion are engaged with each other with the adhesive agent layer being interposed between the protrusion portion and the recess portion.

A power storage system of the present technology includes a battery board configured to accommodate a secondary battery, a branch board, a first frame on which the battery board is placed, a second frame on which the branch board is placed, and a plurality of connection wirings that are disposed in the first frame and the second frame and connects the battery board and the branch board. The plurality of connection wirings are aggregated in the second frame.

A power supply device disposes an end plate at each end of a battery stack in a stacked direction of the battery stack, and couples a binding bar to the end plate, so as to fix battery cells. The binding bar includes a plate-shaped bar that extends in the stacked direction, and an engagement block that is provided on a plate-shaped bar and protrudes toward an outer peripheral face of the end plate. The engagement block is inserted into a fixing hole provided in the plate-shaped bar and fixed to an inner peripheral face of the fixing hole. The end plate includes a fitting part, to which the engagement block is guided, on the outer peripheral face of the end plate, and includes a stopper that is disposed closer to the battery stack with respect to the fitting part and abuts the engagement block.

A power supply device disposes an end plate at each end of a battery stack in a stacked direction of the battery stack, and couples a binding bar to the end plate, so as to fix battery cells. The binding bar includes a plate-shaped bar that extends in the stacked direction, and an engagement block that is provided on a plate-shaped bar and protrudes toward an outer peripheral face of the end plate. The engagement block is inserted into a fixing hole provided in the plate-shaped bar and fixed to an inner peripheral face of the fixing hole. The end plate includes a fitting part, to which the engagement block is guided, on the outer peripheral face of the end plate, and includes a stopper that is disposed closer to the battery stack with respect to the fitting part and abuts the engagement block.