Battery device

1. A battery device comprising:

a battery stack including a plurality of battery cells arranged along a predetermined straight direction;

a pair of end members that are spaced apart from each other in said straight direction and sandwich said battery stack in said straight direction to prevent each of said battery cells from moving in said straight direction;

a temperature adjusting part, which includes a heat exchange part for exchanging heat with said battery stack and a flowing passage in which a fluid for exchanging heat with said heat exchange part is flowing; and

an end member fixing part to which a pair of said end members are fixed, wherein,

said temperature adjusting part and said end member fixing part are integrally united into a single piece structure made of metal.

2. The battery device according to claim 1 , wherein,

said single piece structure is configured to form said heat exchange part contacting a side surface of said battery stack which is placed at a side of said temperature adjusting part, said heat exchange part being a part of at least one of side surfaces of said temperature adjusting part.

3. The battery device according to claim 2 , wherein,

said end member fixing part includes:

an upper restraining part, extending in one of side directions that are orthogonal to said straight direction and said an upper-lower direction from said temperature adjusting part and facing an upper surface of said battery stack from above, to which upper surfaces of said end members are fixed; and

a lower restraining part, extending in the one of said side directions from said temperature adjusting part and facing a lower surface of said battery stack from below, to which lower surfaces of said end members are fixed.

4. The battery device according to claim 3 , wherein,

said end member fixing part includes a pair of said upper restraining parts and a pair of said lower restraining parts,

one of said upper restraining parts extending in said one of said side directions, and the other one of said upper restraining parts extending in the other one of said side directions, and

one of said lower restraining parts extending in said one of said side directions, and the other one of said lower restraining parts extending in the other one of said side directions.

5. The battery device according to claim 1 , wherein,

said single piece structure includes a first member and a second member, each being a press formed piece,

one of surfaces as a first facing surface of said first member faces one of surfaces as a second facing surface of said second member,

said first member has a first concave part on said first facing surface,

said second member has a second concave part on said second facing surface, and

said first concave part and said second concave part form said flowing passage therebetween when said first member and said second member are connected to each other.

6. The battery device according to claim 5 , wherein:

said first concave part includes a plurality of first upper-lower direction flow passage forming concave parts, each extending an upper-lower direction, that are arranged along said straight direction;

a plurality of parts, each located between said first upper-lower direction flow passage forming concave parts adjacent to each other, constitute a plurality of first ribs, each extending said upper-lower direction;

said second concave part includes a plurality of second upper-lower direction flow passage forming concave parts, each extending said upper-lower direction, that are arranged along said straight direction, the number of said second upper-lower direction flow passage forming concave parts being the same as the number of said first upper-lower direction flow passage forming concave parts;

a plurality of parts, each located between said second upper-lower direction flow passage forming concave parts adjacent to each other, constitute a plurality of second ribs, each extending said upper-lower direction, the number of said second ribs being the same as the number of said first ribs; and

when each of said first ribs and each of said second ribs are fixed to each other, a plurality of upper-lower direction flow passages are formed by said first upper-lower direction flow passage forming concave parts and said second upper-lower direction flow passage forming concave parts.

7. The battery device according to claim 1 , wherein:

said fluid is a refrigerant changing between a liquid phase fluid and a gas phase fluid, depending on its temperature, and

said end member fixing part is fixed directly to said temperature adjusting part.