Battery module

1. A battery module, comprising:

a frame having an accommodation space; and

a plurality of batteries successively arranged in the accommodation space in a thickness direction of the battery,

wherein a partition is arranged between adjacent batteries, wherein the partition has a compressibility and a coefficient of compressibility δ 1 at a pressure equal to or smaller than 2 MPa, which meets a relation C 0 ×δ 1 ≤A 0 ×0.2, wherein C 0 is an initial thickness of the partition, and A 0 is an initial thickness of the battery; the partition comprises a closed cell therein.

2. The battery module according to claim 1 , wherein the coefficient of compressibility δ 1 of the partition at a pressure equal to or smaller than 2 MPa meets a relation C 0 ×δ 1 ≤A 0 ×0.1.

3. The battery module according to claim 1 , wherein the partition has a thickness C a at a pressure larger than 2 MPa and a thickness C b at a pressure of 2 MPa, which meet a relation (C b −C a )/C b ×100%≤0.15%.

4. The battery module according to claim 3 , wherein thickness C b of the partition at a pressure of 2 MPa is equal to or larger than 0.015 mm.

5. The battery module according to claim 1 , wherein a thermal conductivity of the partition at a temperature of 25° C. is equal to or smaller than 0.04 W·m −1 ·K −1 .

6. The battery module according to claim 1 , wherein the closed cell has a diameter of 10 nm-120 μm.

7. The battery module according to claim 1 , wherein the partition has a closed cell percentage of 60%-98%.

8. The battery module according to claim 1 , wherein the partition has a first surface and a second surface opposite to each other in its thickness direction, wherein the first surface contacts with one of two adjacent batteries, and the second surface contacts with the other of the two adjacent batteries.

9. The battery module according to claim 8 , wherein the partition has side surfaces which are connected with edges of the first surface and the second surface respectively, wherein at least one protrusion is provided on the side surface.

10. The battery module according to claim 7 , wherein the partition has the closed cell percentage of 80%-95%.

11. The battery module according to claim 8 , wherein the partition comprises a functional layer which is exposed from at least the first surface.

12. The battery module according to claim 11 , wherein the functional layer is provided in a central region of the partition, and the functional layer has an area which is 40%-100% of an area of the partition.

13. The battery module according to claim 12 , wherein the partition further comprises a supporting layer, wherein the partition has a composite structure composed of the supporting layer and the functional layer.

14. The battery module according to claim 11 , wherein the functional layer comprises polymer.

15. The battery module according to claim 14 , wherein the functional layer comprises nitrogen-containing polymer.

16. The battery module according to claim 15 , wherein the functional layer comprises melamine polymer.

17. The battery module according to claim 12 , wherein the functional layer has an area which is 40%-65% of an area of the partition.

18. The battery module according to claim 9 , wherein one of the at least one protrusion is arranged corresponding to a positive electrode terminal or a negative electrode terminal of the battery cell.

19. The battery module according to claim 9 , wherein two of the at least one protrusion are arranged corresponding to a positive electrode terminal and a negative electrode terminal of the battery cell, respectively.

20. The battery module according to claim 9 , wherein at least one of the at least one protrusion is arranged corresponding to a side plate of the frame.