Battery pack

Abstract

In one example, the battery pack includes a cell array including a plurality of rectangular cells aligned in a row, a pair of side plates respectively arranged on both side surfaces of the cell array, and a pair of end plates respectively arranged on front and rear surfaces of the cell array, with both widthwise ends of the end plates fixed to side brackets provided at both longitudinal ends of the side plates, forming a battery block in which the cell array is constrained into one block, and a pack case in which a plurality of the battery blocks are mounted, and the end plates include end brackets fixed to mounting portions provided on the pack case.

Claims

1. A battery block comprising a cell array including a plurality of rectangular cells aligned in a row, a pair of side plates positioned on each side of the cell array, and a pair of end plates positioned on the front and rear surfaces of the cell array, wherein both ends of the end plates in the width direction are fixed to side brackets provided on both ends of the side plates in the longitudinal direction, and the cell array is constrained to a single block, A pack case on which multiple battery blocks are mounted, The end plate includes an end bracket that is fixed to a mounting portion provided on the pack case. The aforementioned side plate is It is a single plate bent into a "∪" shape with its upper end open, so as to form a space inside. The aforementioned side plate is The bent plate has concave surfaces on both sides, A battery pack in which the concave surfaces face each other and are joined together along the longitudinal direction of the concave surfaces to form at least one joining rib.

2. The aforementioned side bracket is The battery pack according to claim 1, further comprising an end bracket fixed to the mounting portion provided in the pack case.

3. The aforementioned end bracket is The battery pack according to claim 1 or 2, comprising a fastening surface parallel to the width direction, with one or more fastening holes formed in the fastening surface, and fixed to the mounting portion via the fastening holes.

4. The aforementioned end bracket is The battery pack according to claim 3, further comprising reinforcing ribs perpendicular to the fastening surface.

5. At the upper end of the aforementioned side plate, The battery pack according to claim 1, wherein the upper flange that contacts the upper surface of the cell array is formed by bending.

6. The battery pack according to claim 5, wherein the end bracket is fixed to the mounting portion, and the upper flange provides a downward fixing force that presses the cell array against the base plate of the pack case.

7. The battery pack according to claim 6, wherein the edge of the upper flange that contacts the upper surface of the cell array is spaced at a distance of 5 to 10 mm from the electrode terminals of the rectangular cell.

8. The aforementioned pack case is It includes a base plate that forms the bottom surface, side frames that form walls along all four sides of the base plate, and an upper cover that seals the top surface of the pack case. The battery pack according to claim 6, wherein the base plate is provided with a cooling channel through which a cooling medium flows.

9. The battery pack according to claim 8, wherein a thermally conductive thermal interface material is interposed between the contact surface of the base plate and the battery block.

10. The side bracket is provided with a fastening groove into which a welding bolt protruding from the end plate is inserted. The battery pack according to claim 1, wherein the welding bolt and fastening groove are joined together by welding.

11. The aforementioned side bracket is The battery pack according to claim 10, wherein the fastening grooves are provided on both the left and right sides with respect to the center in the width direction of the side plate.

12. Another cell array, arranged along the width direction, shares the side plate, The battery pack according to claim 11, wherein welding bolts provided on a pair of end plates, respectively, positioned on the front and rear surfaces of the other cell array, are fixed to fastening grooves of the side bracket, thereby expanding the multiple cell arrays along the width direction.

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