Connection unit
A connection unit of the present invention includes: a rail member extending in a direction where a plurality of storage elements is aligned; and a plurality of bus bar units each including an engagement portion movable along the rail member in the predetermined direction, and a bus bar fixed to electrode terminals of the storage elements adjacent to each other in the predetermined direction and connected to the engagement portion. The plurality of bus bar units engages with the rail member so as to be aligned in the predetermined direction, and the bus bar units adjacent to each other are provided so as to be movable independently along the predetermined direction. Entire assembly tolerance in the plurality of storage elements aligned in the predetermined direction can be absorbed (permitted) by adjusting distances between the independent bus bar units, thereby making it possible to easily assemble the plurality of bus bars.
1. A connection unit configured to electrically connect a plurality of storage elements aligned in a predetermined direction, the connection unit comprising:
an elongated rail member extending in the predetermined direction; and
a plurality of bus bar units each including an engagement portion configured to engage with the rail member so as to slide along the rail member in the predetermined direction, and a bus bar fixed to electrode terminals of the storage elements adjacent to each other in the predetermined direction and connected to the engagement portion, wherein:
the engagement portion is provided so as to extend to a side of the bus bar;
the rail member includes an engagement rail configured to engage with the engagement portion;
the bus bar is disposed to project outside the engagement rail in a state where the bus bar units are attached to the rail member;
the plurality of bus bar units engages with the rail member so as to be aligned in the predetermined direction; and
the bus bar units adjacent to each other are provided so as to be movable independently along the predetermined direction.
2. The connection unit according to claim 1 , wherein:
the rail member includes:
a slit allowing the engagement portion to move along the predetermined direction;
an outlet portion provided at a position corresponding to an exhaust valve configured to exhaust gas generated in the storage element to its outside, the outlet portion extending in the predetermined direction so as to form a gas discharge path provided generally in parallel with the engagement rail; and
a mounting portion extending along the outlet portion and configured such that a temperature sensor configured to detect a temperature of the storage elements is provided therein, and
the engagement rail, the outlet portion, and the mounting portion are formed integrally with each other so as to be aligned in a direction generally perpendicular to the predetermined direction.
3. The connection unit according to claim 1 , wherein:
each of the bus bar units further includes a voltage detection line connected to the bus bar and configured to detect a voltage of the storage element;
the rail member includes a detection line placement portion extending along a direction where the plurality of bus bar units is aligned; and
the voltage detection line extending from the bus bar unit placed in the rail member via the engagement portion is extended in the detection line placement portion generally in parallel with the predetermined direction.
4. The connection unit according to claim 3 , wherein:
the engagement portion is made of thermoplastic resin;
at least part of the voltage detection line including a connection region with the bus bar is covered with the thermoplastic resin; and
the bus bar unit is configured such that the bus bar and the voltage detection line are formed integrally with each other.
5. The connection unit according to claim 1 , wherein:
the bus bar includes a plurality of openings configured to receive terminals of the plurality of storage elements, the plurality of openings being provided on a portion of the bus bar that projects outside the engagement rail.