A battery pack including a frame integrated with a reinforcement member and a supporting member, thereby realizing a compact and lightweight dimension. The battery pack includes a plurality of battery cells stacked on top of each other, a frame including a supporting member covering the plurality of battery cells and a reinforcement member formed inside the supporting member, and an end plate disposed at the exterior of the plurality of battery cells and coupled to the frame.
1. A battery pack comprising:
a plurality of battery cells stacked together;
a frame comprising a supporting member covering the battery cells and a reinforcement member within and directly contacting the supporting member, wherein the frame extends continuously along a length of all of the battery cells; and
an end plate on the battery cells and coupled to the frame,
wherein the supporting member comprises:
a bottom portion covering one side of each of the plurality of battery cells; and
a sidewall portion bent and extending from at least two sides of the bottom portion and covering two sides of each of the battery cells, wherein a part of the reinforcement member is entirely within the sidewall portion and extends along an entire length of the supporting member.
2. The battery pack of claim 1 , wherein the supporting member and the reinforcement member comprise different materials.
3. The battery pack of claim 1 , wherein the supporting member and the reinforcement member are insert molded to each other.
4. The battery pack of claim 1 , wherein the supporting member comprises an insulating resin.
5. The battery pack of claim 1 , wherein the reinforcement member comprises a metallic material.
6. The battery pack of claim 1 , wherein a portion of the reinforcement member protrudes from the supporting member and extends through the end plate.
7. The battery pack of claim 6 , further comprising a nut on an exterior side of the end plate and coupled to the reinforcement member.
8. The battery pack of claim 1 , wherein the reinforcement member is located in the sidewall portion.
9. The battery pack of claim 1 , wherein the reinforcement member comprises:
a base portion comprising a bar and extending in a direction generally parallel to a direction in which the battery cells are stacked;
an extending portion extending from the base portion and protruding from the supporting member and passing through the end plate; and
a screw thread on the extending portion.
10. The battery pack of claim 1 , wherein the reinforcement member includes a plurality of coupling grooves and wherein the plurality of coupling grooves contain the supporting member.
11. The battery pack of claim 1 , wherein the reinforcement member includes a plurality of coupling protrusions protruding from an outer surface of the reinforcement member.
12. The battery pack of claim 1 , wherein the end plate comprises:
a plate portion facing the plurality of battery cells and an opening, wherein the reinforcement member extends through the opening; and
a bent portion bent from and extending from two sides of the plate portion.
13. The battery pack of claim 1 , further comprising a connection member on the reinforcement member, wherein the connection member is coupled to the end plate.
14. The battery pack of claim 13 , wherein the connection member is a bolt passing through the end plate, and wherein the battery pack further comprises a nut coupled to the connection member.
15. The battery pack of claim 13 , wherein the connection member is a nut, and wherein the battery pack further comprises a bolt extending through the end plate and coupled to connection member.
16. The battery pack of claim 13 , wherein the reinforcement member is a mesh type.
17. The battery pack of claim 16 , wherein the reinforcement member comprises a first metal line and a second metal line.
18. The battery pack of claim 1 , further comprising an insulator located between two adjacent battery cells among the plurality of battery cells.