Composite end plate and battery module

1. A composite end plate for a battery module, wherein the battery module comprises two composite end plates and two side plates, wherein the composite end plate comprises a first surface and a second surface disposed opposite to each other in its thickness direction, and the first surface can be disposed to face a battery of the battery module, wherein the composite end plate comprises:

a rigid base plate comprising two ends opposite to each other in a width direction of the composite end plate; and

two rigid connecting plates, wherein each rigid connecting plate extends in a height direction of the composite end plate, wherein the rigid connecting plates and the rigid base plate are made of different materials, each rigid connecting plate comprises a first connecting segment, an intermediate transitional segment and a second connecting segment disposed successively in the width direction, and the second connecting segment comprises a transferring section connected to the intermediate transitional segment and a free-end section,

wherein the two ends of the rigid base plate are fixedly connected to the two rigid connecting plates, and the transferring section of the second connecting segment is exposed from the second surface and can be fixedly connected to a corresponding side plate, and wherein each rigid connecting plate is made of metal materials;

wherein for each rigid connecting plate, both the first connecting segment and the free-end section of the second connecting segment comprise first recesses, and the rigid base plate comprises first protrusions for being inserted into and meshing with the first recesses such that the rigid connecting plate is fixedly connected to the rigid base plate;

for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are embedded in the rigid base plate such that the rigid connecting plate is fixedly connected to the rigid base plate; and

the rigid base plate comprises two positioning grooves each having a shape matching with that of each rigid connecting plate, each positioning groove extends in the height direction of the composite end plate, and each rigid connecting plate is inserted into a corresponding positioning groove along the height direction, and

the first protrusion protrudes toward the positioning groove in the thickness direction, and in the thickness direction, a clearance gap is preformed between a surface of the positioning groove opposing to the first protrusion and a tip of the first protrusion.

2. The composite end plate according to claim 1 , wherein the rigid base plate is made of metal materials.

3. The composite end plate according to claim 1 , wherein for each rigid connecting plate, the intermediate transitional segment extends in the thickness direction, and the first connecting segment and the second connecting segment are disposed at two respective sides of the intermediate transitional segment such that the rigid connecting plate has a stepped shape.

4. The composite end plate according to claim 1 , wherein for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are fixedly connected to the rigid base plate via fasteners, respectively.

5. The composite end plate according to claim 1 , wherein the first recess is a notch or through hole, and a portion of the rigid base plate protruding toward the first recess forms the first protrusion.

6. The composite end plate according to claim 1 , wherein each end of the rigid base plate comprises a positioning surface on the same side with the second surface, and a surface of the transferring section of the second connecting segment away from the first surface of each rigid connecting plate is flush with a corresponding positioning surface.

7. The composite end plate according to claim 1 , wherein the rigid base plate is made of non-metal material.

8. The composite end plate according to claim 2 , wherein for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are fixedly connected to the rigid base plate via fasteners, respectively.

9. The composite end plate according to claim 2 , wherein for each rigid connecting plate, the intermediate transitional segment extends in the thickness direction, and the first connecting segment and the second connecting segment are disposed at two respective sides of the intermediate transitional segment such that the rigid connecting plate has a stepped shape.

10. The composite end plate according to claim 7 , wherein for each rigid connecting plate, the intermediate transitional segment extends in the thickness direction, and the first connecting segment and the second connecting segment are disposed at two respective sides of the intermediate transitional segment such that the rigid connecting plate has a stepped shape.

11. A battery module comprising:

a plurality of batteries arranged side by side; and

a fixing frame enclosing all the batteries at a periphery of the batteries, wherein the fixing frame comprises two composite end plates according to claim 1 and two side plates, the composite end plates and the side plates are successively and alternatively disposed to surround the batteries, each side plate and each rigid connecting plate are made of an identical material and each side plate is fixedly connected to a corresponding transferring section of the second connecting segment.

12. The battery module according to claim 11 , wherein the rigid base plate is made of metal materials.

13. The battery module according to claim 11 , wherein the rigid base plate is made of non-metal material.

14. The battery module according to claim 11 , wherein for each rigid connecting plate, the intermediate transitional segment extends in the thickness direction, and the first connecting segment and the second connecting segment are disposed at two respective sides of the intermediate transitional segment such that the rigid connecting plate has a stepped shape.

15. The composite end plate according to claim 7 , wherein for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are fixedly connected to the rigid base plate via fasteners, respectively.

16. The composite end plate according to claim 3 , wherein for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are fixedly connected to the rigid base plate via fasteners, respectively.

17. The composite end plate according to claim 10 , wherein for each rigid connecting plate, the first connecting segment and the free-end section of the second connecting segment are fixedly connected to the rigid base plate via fasteners, respectively.

18. The composite end plate according to claim 2 , wherein the first recess is a notch or through hole, and a portion of the rigid base plate protruding toward the first recess forms the first protrusion.

19. The composite end plate according to claim 7 , wherein the first recess is a notch or through hole, and a portion of the rigid base plate protruding toward the first recess forms the first protrusion.

20. The composite end plate according to claim 2 , wherein each end of the rigid base plate comprises a positioning surface on the same side with the second surface, and a surface of the transferring section of the second connecting segment away from the first surface of each rigid connecting plate is flush with a corresponding positioning surface.