Electric storage module and electric storage device

1. An electric storage module, comprising:

a cooling plate with a predetermined thickness between a front surface and a rear surface, with the front surface and the rear surface functioning as cooling surfaces by a coolant flowing in the cooling plate, the cooling plate being disposed so that the front surface and the rear surface are substantially perpendicular to a mounting surface;

a first battery row made up with a plurality of prismatic battery cells coupled with the front surface of the cooling plate so as to achieve thermal conduction and to be cooled by the cooling plate, wherein in the first battery row the plurality of battery cells are disposed over a plurality of stages stacked along a direction perpendicular to the mounting surface and arrayed along the cooling plate with battery case bottom surfaces of the battery cells facing the front surface of the cooling plate;

a second battery row made up with a plurality of prismatic battery cells coupled with the rear surface of the cooling plate so as to achieve thermal conduction and to be cooled by the cooling plate, wherein in the second battery row the plurality of battery cells are disposed over a plurality of stages stacked along the direction perpendicular to the mounting surface and arrayed along the cooling plate with battery case bottom surfaces of the battery cells facing the rear surface of the cooling plate;

a pair of end plates that cover the first battery row and the second battery row, one of the end plates being disposed at one side of the direction along which the battery cells are stacked and another of the end plates being disposed at another side of the direction along which the battery cells are stacked;

a first terminal cover disposed at a side of the first battery row opposite from the cooling plate;

a second terminal cover disposed at a side of the second battery row opposite from the cooling plate;

a first locking device that locks, via the pair of end plates, the battery cells of the first battery row and the battery cells of the second battery row with the cooling plate; and

a second locking device that presses the battery cells of the first battery row toward the front surface of the cooling plate via the first terminal cover and presses the battery cells of the second battery row toward the rear surface of the cooling plate via the second terminal cover.

2. An electric storage module according to claim 1 , further comprising:

cell separator plates disposed between the stacked battery cells.

3. An electric storage module according to claim 1 , wherein:

the first locking device comprises a fastening member; and

the second locking device comprises elastic members that lock the end plates with the first terminal cover and with the second terminal cover.

4. An electric storage module according to claim 1 , wherein:

the first locking device includes a fastening member that also functions as the second locking device that presses the battery cells of the first battery row toward the front surface of the cooling plate via the first terminal cover and presses the battery cells of the second battery row toward the rear surface of the cooling plate via the second terminal cover.

5. An electric storage module according to claim 1 , wherein:

positive electrode terminals and negative electrode terminals of the battery cells are disposed at surfaces located on a side opposite from the battery case bottom surfaces of the battery cells.

6. An electric storage module according to claim 1 , wherein:

a heat transfer member with a coefficient of thermal conductivity equal to or higher than 1 W/m·K is disposed between the front surface of the cooling plate and the battery case bottom surfaces of the battery cells and between the rear surface of the cooling plate and the battery case bottom surfaces of the battery cells.

7. An electric storage module according to claim 6 , wherein:

the heat transfer member is constituted with one of a thermally conductive sheet, a thermally conductive gel and a thermally conductive adhesive.

8. An electric storage module according to claim 6 , wherein:

insulating members with a predetermined thickness are disposed at the cooling plate so as to hold corners of the battery cells; and

the heat transfer member, compressed to a thickness corresponding to the thickness of the insulating members, is in contact with the front surface of the cooling plate and the battery case bottom surfaces of the battery cells and with the rear surface of the cooling plate and the battery case bottom surfaces of the battery cells.

9. An electric storage module according to claim 6 , wherein:

a recessed portion with a width smaller than a width of the battery case bottom surfaces of the battery cells is formed at both the front surface and the rear surface of the cooling plate; and

the heat transfer member, placed within the recessed portion and compressed along a thickness-wise direction, is in contact with the front surface of the cooling plate and the battery case bottom surfaces of the battery cells and with the rear surface of the cooling plate and the battery case bottom surfaces of the battery cells.

10. An electric storage device comprising:

a plurality of electric storage modules, each corresponding to the electric storage module according to claim 1 , wherein:

cooling plates of the electric storage modules are connected to one another via a piping so as to achieve a branched flow of coolant.