Battery case, battery module, and battery module manufacturing method

1. A battery case that accommodates therein a battery cell that has a first main surface and a second main surface opposite to the first main surface, the battery case comprising:

a chassis with which the first main surface of the battery cell comes into contact;

an adjustment plate placed on the second main surface of the battery cell; and

a holding plate that is formed from an elastic member and covers the second main surface of the battery cell with the adjustment plate between the holding plate and the battery cell,

wherein the holding plate is secured to a side wall of the chassis above a central position of the battery cell and below the second main surface in a height direction perpendicular to the first main surface and the second main surface.

2. The battery case according to claim 1 , wherein

the battery cell includes

an outer can,

two polar plates provided in the outer can,

a current collector plate connected to the polar plates, and

a terminal electrode connected to the current collector plate, and

the adjustment plate is provided at a position corresponding to the current collector plate of the battery cell.

3. The battery case according to claim 2 , wherein the adjustment plate is sized larger than the current collector plate of the battery cell and covers a region facing the current collector plate.

4. The battery case according to claim 1 , wherein the holding plate has a thickness greater than or equal to 1 mm.

5. The battery case according to claim 1 , wherein

the holding plate is secured to a support block provided at a corner portion defined by a bottom plate and the side wall of the chassis, and

the battery case has a clearance between the battery cell and the support block.

6. The battery case according to claim 5 , wherein the holding plate is secured to the support block by a plurality of bolts.

7. The battery case according to claim 1 , wherein the holding plate is an elastic member made of iron, iron-containing alloy, or titanium.

8. The battery case according to claim 1 , wherein the adjustment plate has a trapezoidal cross section that is wider toward the battery cell.

9. The battery case according to claim 1 , wherein the adjustment plate is formed with a recess portion on an outer side of a surface facing the battery cell and near a position where the holding plate is secured to the side wall of the chassis.

10. A battery module comprising:

the battery case according to claim 1 ;

a battery cell that is placed such that the first main surface thereof comes into contact with the chassis; and

a holding plate that holds the battery cell in place so as to cover the second main surface of the battery cell with the adjustment plate placed on the second main surface of the battery cell between the holding plate and the battery cell.

11. The battery module according to claim 10 , wherein

two chassis are integrally formed such that one side of each of the chassis, on which the battery cell is installed, faces outward, and

the battery cells are mounted respectively on the chassis such that the first main surfaces of the battery cells are parallel to each other.

12. A battery case that accommodates therein a battery cell that has a first main surface and a second main surface opposite to the first main surface, the battery case comprising:

a chassis with which the first main surface of the battery cell comes into contact; and

a holding plate that is formed from an elastic member with a thickness greater than or equal to 1 mm and covers the second main surface of the battery cell, wherein

the holding plate is secured to a side wall of the chassis above a central position of the battery cell and below the second main surface in a height direction perpendicular to the first main surface and the second main surface.

13. A battery module manufacturing method comprising:

placing on a chassis a battery cell and bringing a first main surface of the battery cell into contact with the chassis, the battery cell including an outer can that has the first main surface and a second main surface opposite to the first main surface, two polar plates provided in the outer can, a current collector plate connected to the polar plates, and a terminal electrode connected to the current collector plate;

placing a holding plate formed from an elastic member on the second main surface of the battery cell with an adjustment plate between the holding plate and the battery cell so as to cover the second main surface of the battery cell, and securing the holding plate to the chassis above a center of the battery cell between the first main surface and the second main surface and below the second main surface in such a manner as to have a clearance from the battery cell.