CN-224232740-U - Battery cell, battery device and electricity utilization device

CN224232740UCN 224232740 UCN224232740 UCN 224232740UCN-224232740-U

Abstract

The application discloses a battery cell, a battery device and an electric device, wherein the battery cell comprises a shell, an electrode assembly, a first limiting piece and a second limiting piece, wherein the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the first limiting piece is arranged in the containing cavity and is positioned at one side of the electrode assembly in a first direction, the first limiting piece comprises a first body part and a first protruding part, the first protruding part protrudes towards the electrode assembly relative to the first body part, the second limiting piece is arranged in the containing cavity and is positioned at one side of the electrode assembly, which is away from the first limiting piece, the second limiting piece comprises a second body part and a second protruding part, the second protruding part protrudes towards the electrode assembly relative to the second body part, and the projection of the first protruding part in the first direction and the projection of the second protruding part in the first direction at least partially overlap.

Inventors

KE HAIBO
LIN DENGHUA
ZHENG YULIAN
HUANG SHOUJUN
ZHANG XIAOPING
BAI HUALEI

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250227

Claims (15)

1. A battery cell, comprising: A housing having a receiving cavity; An electrode assembly disposed in the receiving chamber, the electrode assembly having a middle region and edge regions located at both sides of the middle region in a second direction; the first limiting part is arranged in the accommodating cavity and is positioned at one side of the electrode assembly in a first direction, the first limiting part comprises a first body part and a first supporting part, the first supporting part is arranged in a protruding mode towards the electrode assembly relative to the first body part, and the first direction and the second direction are intersected; the second limiting piece is arranged in the accommodating cavity and is positioned at one side of the electrode assembly, which is away from the first limiting piece, and comprises a second body part and a second supporting part, and the second supporting part is arranged in a protruding manner relative to the second body part; Wherein the first support portion, the second support portion and the intermediate region at least partially overlap in a projection plane perpendicular to the first direction.
2. The battery cell according to claim 1, wherein a pressure release mechanism is provided on one side of the housing in the first direction, the first stopper is provided on one side of the electrode assembly facing away from the pressure release mechanism, the second stopper is provided on one side of the electrode assembly facing toward the pressure release mechanism, and the second support portion is formed to protrude in a direction away from the electrode assembly with respect to the second body portion; Wherein, in the projection plane perpendicular to the first direction, the projection of a part of the pressure relief mechanism and the second support part overlap, and the projection of another part of the pressure relief mechanism and the second support part are dislocated.
3. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The first limiting piece further comprises first protruding parts, and at least two first protruding parts are arranged on two sides of the first supporting part in the second direction; the second limiting piece further comprises a second protruding part, at least two second protruding parts are positioned at two sides of the second supporting part in the second direction, Wherein each of the second protrusions and each of the first protrusions at least partially overlap in a projection plane perpendicular to the first direction.
4. The battery cell according to claim 3, wherein the electrode assembly includes an electrode body and a tab connected to one side of the electrode body, and the first protrusion is abutted to the electrode body to form a space for accommodating the tab between the first body portion, the two first protrusions, and the electrode body.
5. The battery cell according to claim 4, wherein the electrode body has a first center in the second direction, and an overlapping area of projections of the first support portion and the second support portion in the first direction has a second center in the second direction, and a distance a between the first center and the second center in the second direction is 0 to 30mm.
6. The battery cell as recited in claim 3, wherein the second support portion is formed extending in the second direction, and the second support portion and the second projection are integrally formed; Or the second supporting part and the second protruding part are arranged at intervals.
7. The battery cell as recited in claim 6, wherein the second support portion is formed extending in the second direction, and the second support portion and the second projection are integrally formed, The second supporting portions comprise more than two sub-supporting portions distributed at intervals along a third direction, more than two second protruding portions are arranged at intervals along the third direction, each second protruding portion and each sub-supporting portion are integrally formed, and the first direction, the second direction and the third direction are arranged in a two-to-two intersection mode.
8. The battery cell according to claim 3, wherein, among the first and second protruding portions provided corresponding to each other, an extension length L1 of a projection overlapping region of the first and second protruding portions in the first direction in the second direction is greater than or equal to 3mm.
9. The battery cell of claim 3, wherein the battery cell comprises a plurality of cells, The sum of the height of the first supporting part protruding from the first body part and the height of the second supporting part protruding from the second body part is a first height sum; At least one group of the first convex part and the second convex part which are mutually corresponding, the sum of the height of the first protruding part protruding from the first body part and the height of the second protruding part protruding from the second body part is a second sum of the heights; The first height sum is equal to the second height sum.
10. The battery cell of claim 1, wherein an extension length L0 of a projected overlapping region of the first support portion and the second support portion in the first direction in a second direction, the second direction intersecting the first direction, is greater than or equal to 3 mm.
11. The battery cell according to claim 1, wherein the second support portion is formed by extending in a third direction, a ratio of an extension width W2 of the second support portion in the third direction to an extension width W1 of the second body portion in the third direction is 0.5 to 0.9, and the first direction and the third direction intersect.
12. The battery cell according to claim 11, wherein the housing is provided with a pressure release mechanism on one side of the first direction, and a projected area of the pressure release mechanism along the first direction is larger than a projected area of the second support portion along the first direction.
13. The battery cell of claim 12, wherein the second body portion is provided with a relief hole therethrough, a projection of the relief hole along the first direction at least partially overlapping a projection of the pressure relief mechanism along the first direction, and the second support portion is positioned within the relief hole and interconnected with the second body portion.
14. A battery device comprising a battery cell according to any one of claims 1-13.
15. An electrical device comprising the battery device of claim 14.

Description

Battery cell, battery device and electricity utilization device Technical Field The present application relates to the field of batteries, and in particular, to a battery cell, a battery device, and an electric device. Background Battery devices are widely used in electronic equipment such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. However, the energy density and weight reduction cost reduction requirements of the battery device are higher and higher, the space arrangement is more and more compact, the exhaust device occupies more space, the arrangement space inside the battery device is insufficient, and the energy density of the battery device is lower. Disclosure of utility model In view of the above, the present application provides a battery cell, a battery device, and an electric device, which can improve the safety performance of the battery cell. The application provides a battery cell, which comprises a shell, an electrode assembly, a first limiting piece and a second limiting piece, wherein the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity and is provided with a middle area and edge areas positioned at two sides of the middle area in a second direction, the first limiting piece is arranged in the containing cavity and is positioned at one side of the electrode assembly in the first direction, the first limiting piece comprises a first body part and a first supporting part, the first supporting part protrudes towards the electrode assembly relative to the first body part, the second limiting piece is arranged in the containing cavity and is positioned at one side of the electrode assembly, which is away from the first limiting piece, the second limiting piece comprises a second body part and a first supporting part, the first supporting part protrudes towards the second body part, and the first supporting part, the second supporting part and the middle area are at least partially overlapped in a projection plane perpendicular to the first direction. In the scheme of the embodiment of the application, the battery cell comprises a shell, an electrode assembly, a first limiting piece and a second limiting piece. The case includes a receiving chamber such that the case can provide a reaction space for the electrode assembly located in the receiving chamber. The first limiting piece and the second limiting piece are respectively arranged on two sides of the electrode assembly in the first direction, and the first supporting part of the first limiting piece and the second supporting part of the second limiting piece can both provide limiting for the electrode assembly, so that the problem that the electrode assembly is easy to shake in the first direction is solved. In the projection plane perpendicular to the first direction, the first supporting part, the second supporting part and the middle area are at least partially overlapped, so that the first supporting part and the second supporting part can provide limit for the middle area of the electrode assembly, the stability of the middle area of the electrode assembly in the accommodating cavity is better improved, the problem that the pole piece in the middle area of the electrode assembly is easy to slide down to cause is solved, and the safety performance of the battery cell is further improved. In some embodiments, a pressure release mechanism is arranged on one side of the shell in the first direction, a first limiting piece is arranged on one side of the electrode assembly, which faces away from the pressure release mechanism, a second limiting piece is arranged on one side of the electrode assembly, which faces towards the pressure release mechanism, and a second supporting portion is formed in a protruding mode relative to a second body portion in a direction away from the electrode assembly, wherein in a projection plane perpendicular to the first direction, projection of one part of the pressure release mechanism and projection of the second supporting portion overlap, and projection of the other part of the pressure release mechanism and projection of the second supporting portion are misplaced. In these embodiments, a vent passage may be formed between the second support and the housing, such that gas can quickly reach the pressure relief mechanism via the vent passage and be vented in time. And a part of the pressure release mechanism and the second supporting part are projected to overlap, so that the second supporting part can provide support for the electrode assembly in the area where the pressure release mechanism is located, and the second supporting part and the first supporting part are matched with each other to provide better limit for the electrode assembly. The projection of the other part of the pressure releas