EP-4738573-A1 - CASE BODY, BATTERY AND ELECTRIC DEVICE

Abstract

The present application discloses a box body, a battery and an electrical apparatus. The box body is applied to the battery. The box body includes a first box body, a second box body, a first sealing member and a position-limiting portion. The first box body has a first sealing surface. The second box body has a second sealing surface. The first sealing member is arranged between the first sealing surface and the second sealing surface so that the first sealing surface is in sealed connection with the second sealing surface. The position-limiting portion protrudes from the second sealing surface and is configured to limit the movement of the first sealing member. Technical solutions provided in the present application can improve the reliability of the battery.

Inventors

• WU, KAI
• ZHAO, PENGBO
• WANG, YONG
• ZHANG, WEI
• SHI, Weigang

Assignees

• Contemporary Amperex Technology Co., Limited

Dates

Publication Date

20260506

Application Date

20231222

Claims (20)

1. A box body applied to a battery, comprising: a first box body having a first sealing surface; a second box body having a second sealing surface; a first sealing member arranged between the first sealing surface and the second sealing surface so that the first sealing surface is in sealed connection with the second sealing surface; and a position-limiting portion protruding from the second sealing surface and configured to limit the movement of the first sealing member.
2. The box body according to claim 1, wherein the position-limiting portion comprises a first position-limiting protrusion and a second position-limiting protrusion arranged at an interval, and the first sealing member is arranged between the first position-limiting protrusion and the second position-limiting protrusion.
3. The box body according to claim 2, wherein the width of the first sealing member in a natural state is b; and along an interval direction of the first position-limiting protrusion and the second position-limiting protrusion, the minimum distance between the first position-limiting protrusion and the second position-limiting protrusion is B, satisfying b+2 mm≤B≤b+20 mm.
4. The box body according to any one of claims 1 to 3, wherein the thickness of the first sealing member in a natural state is h; and the height of the position-limiting portion protruding from the second sealing surface is H1, satisfying 0.3 h≤H1≤0.7 h.
5. The box body according to any one of claims 1 to 4, wherein the box body further comprises a connecting element, and the first sealing surface and the second sealing surface are connected through the connecting element.
6. The box body according to claim 5, wherein the projection of the connecting element does not coincide with the projection of the first sealing member along a direction perpendicular to the second sealing surface.
7. The box body according to claim 5 or 6, wherein the first box body and the second box body together enclose to form a closed space for accommodating battery cells; and the second sealing surface has a first edge close to the closed space and a second edge away from the closed space, and the first sealing member is closer to the first edge than the connecting element.
8. The box body according to any one of claims 5 to 7, wherein a through hole is formed in the first sealing surface, a threaded hole is formed in the second sealing surface, and the connecting element passes through the through hole and is in threaded fit with the threaded hole.
9. The box body according to claim 8, wherein the connecting element comprises a body and a first position-limiting body, one end of the body is connected to the first position-limiting body, the other end of the body is in threaded fit with the threaded hole, the cross-sectional area of the first position-limiting body is larger than the cross-sectional area of the body, and the first position-limiting body is in contact with a surface of the first box body facing away from the second sealing surface.
10. The box body according to claim 9, wherein the connecting element further comprises a second position-limiting body, the second position-limiting body is arranged between the first position-limiting body and the body, the cross-sectional area of the first position-limiting body is larger than the cross-sectional area of the second position-limiting body, the cross-sectional area of the second position-limiting body is larger than the cross-sectional area of the body, and a portion of the second position-limiting body is located in the through hole and is in contact with the second sealing surface.
11. The box body according to claim 10, wherein the first box body comprises a first side wall, the through hole is formed in the first side wall, and the first position-limiting body is in contact with a surface of the first side wall facing away from the second sealing surface; and the thickness of the first sealing member in a natural state is h, the thickness of the first side wall is d, and the length of the second position-limiting body is H2, satisfying 0.3 h+d≤H2≤0.7 h+d.
12. The box body according to any one of claims 1 to 11, wherein the first sealing surface and the second sealing surface intersect with the horizontal plane.
13. The box body according to claim 12, wherein the first sealing surface and the second sealing surface are arranged perpendicular to the horizontal plane.
14. The box body according to claim 12 or 13, wherein the first box body comprises a first end wall and a first side wall; and the second box body comprises a second end wall, the second end wall is arranged opposite to the first end wall along a first direction, the second box body has the second sealing surface in a second direction, the first direction intersects with the second direction, and the second direction is parallel to the horizontal plane, wherein one end of the first side wall is connected to the first end wall, and the other end of the first side wall has the first sealing surface.
15. The box body according to claim 14, wherein the position-limiting portion comprises a first position-limiting protrusion, and the first sealing member is closer to the first end wall than the first position-limiting protrusion along the first direction.
16. The box body according to claim 15, wherein the first position-limiting protrusion extends from one end of the second sealing surface to the other end along a third direction, and the third direction, the first direction and the second direction are perpendicular to each other.
17. The box body according to claim 15 or 16, wherein the position-limiting portion further comprises a second position-limiting protrusion, the first position-limiting protrusion and the second position-limiting protrusion are oppositely arranged at an interval along a first direction, and the first sealing member is arranged between the first position-limiting protrusion and the second position-limiting protrusion.
18. The box body according to claim 17, wherein the second position-limiting protrusion extends from one end of the second sealing surface to the other end along a third direction, and the third direction, the first direction and the second direction are perpendicular to each other.
19. The box body according to any one of claims 14 to 18, wherein there are two first side walls, and the two first side walls are arranged oppositely along the second direction; and the second end wall is located between the two first side walls, the second box body has two second sealing surfaces arranged oppositely along the second direction, and the second sealing surfaces are in one-to-one correspondence to the first side walls.
20. The box body according to claim 19, wherein openings are respectively formed at two ends of the first box body along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; and the second box body further comprises two second side walls, the two second side walls are oppositely arranged at an interval in the third direction and are connected to the second end wall, and the two second side walls respectively seal the two openings.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese patent application No. 202310799035.5 filed on June 30, 2023 and entitled "BOX BODY, BATTERY AND ELECTRICAL APPARATUS", the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the technical field of batteries, and in particular, to a box body, a battery and an electrical apparatus. BACKGROUND With energy saving and emission reduction being the key to the sustainable development of the automobile industry, electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy saving and environmental protection. The battery technology is an important factor related to the development of electric vehicles. In the development of the battery technology, how to improve the reliability of batteries is an urgent technical problem to be solved in the battery technology. SUMMARY OF THE INVENTION The present application provides a box body, a battery and an electrical apparatus. Technical solutions provided in the present application can improve the reliability of the battery. The present application is implemented through the following technical solutions: According to a first aspect, the present application provides a box body. The box body is applied to a battery. The box body includes a first box body, a second box body, a first sealing member and a position-limiting portion. The first box body has a first sealing surface. The second box body has a second sealing surface. The first sealing member is arranged between the first sealing surface and the second sealing surface so that the first sealing surface is in sealed connection with the second sealing surface. The position-limiting portion protrudes from the second sealing surface and is configured to limit the movement of the first sealing member. In the above solution, by the position-limiting portion protruding from the second sealing surface, the movement of the first sealing member can be effectively limited to reduce the risk of sealing failure of the first sealing surface and the second sealing surface due to misalignment of the first sealing member during assembly of the box body, thereby making the box body more reliable and further improving the reliability of the battery. According to some embodiments of the present application, the position-limiting portion includes a first position-limiting protrusion and a second position-limiting protrusion arranged at an interval, and the first sealing member is arranged between the first position-limiting protrusion and the second position-limiting protrusion. In the above solution, by arranging the first position-limiting protrusion and the second position-limiting protrusion at an interval on the second sealing surface and locating the first position-limiting protrusion and the second position-limiting protrusion on two sides of the first sealing member, the movement of the first sealing member can be effectively limited to locate the first sealing member in a correct position to reduce the risk of sealing failure of the first sealing surface and the second sealing surface due to misalignment of the first sealing member during assembly of the box body, thereby making the box body more reliable and further improving the reliability of the battery. According to some embodiments of the present application, the width of the first sealing member in a natural state is b. Along an interval direction of the first position-limiting protrusion and the second position-limiting protrusion, the minimum distance between the first position-limiting protrusion and the second position-limiting protrusion is B, satisfying b+2 mm≤B≤b+20 mm. During assembly of the box body, the first box body and the second box body are connected to each other, and the first sealing member between the first sealing surface and the second sealing surface will be compressed, that is, in a natural state, the first sealing member is deformed and compressed by the action force of the first box body and the second box body, thereby increasing the width of the first sealing member. In the above solution, by defining the numerical relationship between the minimum distance B between the first position-limiting protrusion and the second position-limiting protrusion and the width b of the first sealing member in a natural state, the risk of reduction of the sealing effect caused by the damage to the first sealing member due to interference between the first sealing member after compression and the position-limiting portion can be effectively reduced, thereby making the box body more reliable and making the battery more reliable. According to some embodiments of the present application, the thickness of the first sealing member in a natural state is h. The height of the position-limiting portion protruding from the second sealing surface is H