Electricity storage module
An electricity storage module includes a plurality of electricity storage cells, a plurality of resin frames, and a bus bar module. Each of the electricity storage cells includes a pair of external terminals. The bus bar module includes a plurality of bus bars and a bus bar case. The resin frame includes a retaining portion configured to retain the bus bar case. The bus bar case includes a retained portion that is configured to engage with the retaining portion, and a biasing portion that is configured to bias the bus bar toward a side of the retained portion, in a state in which the retained portion is engaged with the retaining portion.
1 . An electricity storage module comprising:
a plurality of electricity storage cells disposed so as to be arrayed in one direction;
a plurality of resin frames each being disposed between a pair of the electricity storage cells adjacent to each other in the one direction; and
a bus bar module disposed on the electricity storage cells and the resin frames, wherein
each of the electricity storage cells includes a pair of external terminals that are separated from each other in a width direction orthogonal to the one direction,
the bus bar module includes
a plurality of bus bars configured to electrically connect the external terminals adjacent to each other in the one direction, and
a bus bar case configured to hold the bus bars,
each of the resin frames includes a retaining portion configured to retain the bus bar case, and
the bus bar case includes
an accommodating portion having a square tube shape defining an outer wall on an outer side in the width direction and an inner wall on an inner side in the width direction, wherein the accommodating portion accommodates a bus bar between the inner wall and the outer wall,
a retained portion that is configured to engage with the retaining portion, and
a biasing portion defined by a pair of slits in the inner wall accommodating the bus bar and configured to bias the bus bar toward a side of the retained portion by contacting a side of the bus bar facing along the width direction, in a state in which the retained portion is engaged with the retaining portion.
2 . The electricity storage module of claim 1 , wherein
each of the plurality of bus bars comprises a welded portion having a flat plate shape that is welded to one of the external terminals, and a vertical wall extending from the flat plate shape in a direction perpendicular to the one direction and the width direction and facing the width direction,
the accommodating portion accommodates the bus bars between the inner wall and the outer wall in a state in which the inner wall corresponds to the vertical wall of the bus bars, and
the biasing portion is configured to bias the bus bar toward the side of the retained portion by contacting the vertical wall of the bus bar, in the state in which the retained portion is engaged with the retaining portion.
3 . The electricity storage module of claim 1 , wherein
the accommodating portion has a pair of side walls extending along the width direction between the outer wall and the inner wall, and the accommodating portion accommodates the plurality of bus bars between the outer wall, the inner wall, and the pair of side walls, and
the bus bar case further includes a plurality of locking portions protruding in the one direction from an inner surface of each of the pair of side walls and configured to restrain the bus bars.
4 . The electricity storage module of claim 1 , wherein
the retained portion is protruding outward in the width direction from an outer side of the outer wall of the accommodating portion so as to form a gap between the retained portion and the outer wall, and the retained portion is configured to engage with the retaining portion by receiving the retaining portion in the gap.