A battery module according to one aspect of the present invention includes: a plurality of rechargeable batteries; a housing configured to house the plurality of rechargeable batteries and having a first fastening portion; a cover configured to couple to the housing and having a second fastening portion configured to couple to the first fastening portion by a tight fitting; and an elastic member configured to fit between the first and second fastening portions.
1. A battery module comprising:
a plurality of rechargeable batteries;
a housing configured to house the plurality rechargeable batteries and having a first fastening portion;
a cover configured to couple to the housing and having a second fastening portion configured to couple to the first fastening portion by a fitting, the second fastening portion having a recess; and
an elastic member configured to fit between the first and second fastening portions entirely within the recess.
2. The battery module of claim 1 , wherein the first fastening portion is in the shape of a protrusion along an upper side of a wall body of the housing.
3. The battery module of claim 2 , wherein the second fastening portion is formed in the shape of a groove, and
wherein the first fastening portion has a first inclined side inclined to the upper side of the wall body.
4. The battery module of claim 3 , wherein the second fastening portion has a second inclined side contacting and inclined to the first inclined side, and the second inclined side has an incline angle that is greater than that of the first inclined side.
5. The battery module of claim 4 , wherein the elastic member is configured to be inserted between the first and second inclined sides.
6. The battery module of claim 2 , wherein the first fastening portion has an inclined side inclined to an inner side of the second fastening portion.
7. The battery module of claim 6 , wherein the second fastening portion is formed in the shape of a groove, and
wherein a root portion of the first fastening portion is larger than an entrance portion of the second fastening portion.
8. The battery module of claim 1 , wherein the first fastening portion is formed in the shape of a groove.
9. The battery module of claim 8 , wherein the second fastening portion is formed in the shape of a protrusion along an upper side of a wall body of the housing, and
wherein a cross-section of the second fastening portion is gradually increased toward the wall body of the housing.
10. The battery module of claim 8 , wherein the second fastening portion has a cross-section that is gradually decreased toward the cover.
11. The battery module of claim 8 , wherein the second fastening portion has an inclined side inclined to an inner side of the first fastening portion.
12. The battery module of claim 11 , wherein the elastic member is inserted between the inner side and the inclined side of the first fastening portion and the inclined side of the second fastening portion.
13. The battery module of claim 1 , wherein the first fastening portion is formed along a circumference of the housing.
14. The battery module of claim 13 , wherein the second fastening portion is formed along a circumference of the cover.
15. The battery module of claim 13 , further comprising a pressing member configured to press the cover to the housing.
16. The battery module of claim 1 , wherein the first fastening portion and the second fastening portion are configured to be couple to each other by a tight fitting.
17. The battery module of claim 1 , wherein the elastic member comprises a material selected from the group consisting of natural rubber, silicon, polybutylene terephthalate (PBT), ethylene propylene diene monomer (EPDM), and polyamides.