CN-224232701-U - Battery cell, battery device and electricity utilization device

CN224232701UCN 224232701 UCN224232701 UCN 224232701UCN-224232701-U

Abstract

The application provides a battery cell, a battery device and an electric device. The battery monomer includes casing, electrode assembly and heat conduction subassembly, the electrode assembly is located the casing, the heat conduction subassembly includes insulating part and heat conduction spare, the insulating part sets up around the week side of electrode main part, with the insulating reliability that promotes side and casing, the heat conduction spare sets up in the holding chamber of insulating part, so that the heat conduction spare is insulating through insulating part and electrode main part, the heat conduction spare sets up around the week side of electrode main part, promote the heat exchange rate of electrode main part in its side department and external environment, the heat conduction spare is provided with the clearance that extends in first direction and runs through it, through setting up the ability of clearance reinforcing heat conduction spare elastic deformation, with the synchronous deformation of convenient heat conduction spare along with the electrode assembly, reduce the extrusion force between heat conduction spare and the electrode main part, reduce the impaired risk of heat conduction spare and the mutual extrusion of electrode main part, promote the life of heat conduction subassembly, promote the free reliability of battery.

Inventors

WANG HENG
WANG YANLE
LONG WENBAO
ZHENG XIANFENG
ZHANG HUI

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250318

Claims (13)

1. A battery cell, comprising: A housing; an electrode assembly within the case, the electrode assembly including an electrode body and a tab connected to each other, the electrode body including first and second end surfaces disposed opposite to each other in a first direction, and a side surface connected between the first and second end surfaces, the tab protruding from at least one of the first and second end surfaces; The heat conduction assembly comprises an insulating part and a heat conduction part, wherein an accommodating cavity is formed in at least part of the area of the insulating part, the heat conduction part is arranged in the accommodating cavity, the insulating part and the heat conduction part are all arranged around the periphery of the electrode main body, the heat conduction part is provided with a gap, and the gap extends along the first direction and penetrates through the heat conduction part.
2. The battery cell of claim 1, wherein the side surfaces comprise two first side surfaces and two second side surfaces, the two first side surfaces are disposed opposite each other in a second direction, the two second side surfaces are disposed opposite each other in a third direction, the first direction, the second direction, and the third direction intersect each other in pairs, the area of the first side surfaces is larger than the area of the second side surfaces, The gap is located at the second side in at least a partial orthographic projection of the electrode assembly.
3. The battery cell according to claim 2, wherein the heat conductive member is wound around at least one of the electrode bodies, and the gap is formed between both end portions of the heat conductive member.
4. The battery cell of claim 3, wherein the heat conductive member comprises a first heat conductive portion, a second heat conductive portion, and a third heat conductive portion, the two first heat conductive portions are disposed on the two first sides, the second heat conductive portion and the third heat conductive portion are disposed on the two second sides, the second heat conductive portion is connected to the two first heat conductive portions, The third heat conducting parts are connected with one first heat conducting part and are arranged with the other first heat conducting part at intervals to form the gap, or the two third heat conducting parts are respectively connected with the two first heat conducting parts, and the two third heat conducting parts are arranged at intervals in the second direction to form the gap.
5. The battery cell according to claim 2, wherein at least two of the electrode assemblies are provided, at least two of the electrode assemblies are stacked in the second direction, The heat conducting members continuously extend and form two heat conducting structures arranged along the second direction, the heat conducting structures are wound on at least one electrode main body, and at least one end part and a middle area of the heat conducting members are arranged at intervals to form the gap.
6. The battery cell according to claim 5, wherein the heat conductive member comprises a first heat conductive part, two second heat conductive parts, and two third heat conductive parts, the first heat conductive part comprises a middle heat conductive member and two end heat conductive members, the middle heat conductive member is disposed between the two end heat conductive members in the second direction, the end heat conductive members and the middle heat conductive member are disposed at both sides of the electrode assembly, The middle heat conducting piece is arranged between two adjacent first side surfaces of the two adjacent electrode assemblies, the second heat conducting part and the third heat conducting part are arranged at two ends of the same end heat conducting piece in the third direction, the two second heat conducting parts are respectively connected with two ends of the middle heat conducting piece in the third direction, the third heat conducting part and the middle heat conducting piece are arranged at intervals to form a gap, and the end heat conducting piece, the second heat conducting part and the third heat conducting part which are connected with the end heat conducting piece, and the middle heat conducting piece form the same heat conducting structure.
7. The battery cell according to any one of claims 2 to 6, wherein a plurality of the electrode assemblies are provided, a plurality of the electrode assemblies are stacked in the second direction, The battery unit comprises at least two heat conducting assemblies which are arranged at intervals along the second direction, and the at least two heat conducting assemblies are respectively arranged at the at least two electrode assemblies.
8. The battery cell of claim 7, wherein at least two of the gaps are disposed on either side of the electrode assembly in a third direction thereof.
9. The battery cell of claim 1, wherein the side surfaces comprise two first side surfaces and two second side surfaces, the two first side surfaces are disposed opposite each other in a second direction, the two second side surfaces are disposed opposite each other in a third direction, the first direction, the second direction, and the third direction intersect each other, The heat conduction assembly further comprises an adhesive layer, the insulating piece is adhered to the first side face through the adhesive layer, and the adhesive layer is arranged at intervals between the third direction and the edge of the first side face.
10. The battery cell of claim 1, wherein the housing includes an opening in the first direction, the battery cell further comprising an end cap assembly that covers the opening and is connected to the tab, at least a portion of the insulator extending in the first direction beyond the first end face and being connected to the end cap assembly.
11. The battery cell of claim 1, wherein the tab extends from the first end surface, and further comprising an insulating mechanism disposed on the second end surface and coupled to the insulating member.
12. A battery device comprising a battery cell according to any one of claims 1-11.
13. An electrical device comprising a battery device according to claim 12.

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 cells are widely used in electronic devices 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. In the practical working process of the battery cell, the service life and performance of the battery cell are adversely affected by the excessively high or excessively low internal temperature of the battery cell, so in the related art, a heat conduction assembly is usually arranged in the battery cell to stabilize the temperature of the electrode assembly, and how to improve the service life of the heat conduction assembly is a problem to be solved urgently. 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 service life of a heat conduction assembly and enhance the reliability thereof. The application provides a battery cell, which comprises a shell, an electrode assembly and a heat conduction assembly, wherein the electrode assembly is positioned in the shell and comprises an electrode main body and a lug which are connected with each other, the electrode main body comprises a first end face and a second end face which are oppositely arranged in a first direction, and a side face connected between the first end face and the second end face, the lug extends out of at least one of the first end face and the second end face, the heat conduction assembly comprises an insulating part and a heat conduction part, at least part of the insulating part forms a containing cavity, the heat conduction part is arranged in the containing cavity, the insulating part and the heat conduction part are all arranged around the periphery of the electrode main body, and a gap is arranged on the heat conduction part and extends along the first direction and penetrates through the heat conduction part. In the scheme of the embodiment of the application, the battery monomer comprises a shell, an electrode assembly and a heat conducting assembly, wherein the electrode assembly is positioned in the shell, the electrode assembly comprises an electrode main body and a tab which are connected with each other, the electrode main body comprises a first end face, a second end face and a side face, the heat conducting assembly comprises an insulating part and a heat conducting part, the insulating part is arranged around the periphery of the electrode main body, a splicing seam on the insulating part is reduced so as to improve the insulation reliability of the side face and the shell, the heat conducting part is arranged in a containing cavity of the insulating part, the heat conducting part is insulated from the electrode main body through the insulating part, the heat conducting part is arranged around the periphery of the electrode main body so as to increase the contact area of the heat conducting part and the side face of the electrode main body, the heat exchange rate of the electrode main body between the side face and the external environment is improved, the heat conducting part is provided with a gap which extends in a first direction, the elastic deformation capacity of the heat conducting part is enhanced through the arrangement of the gap so as to facilitate the synchronous deformation of the heat conducting part along with the electrode assembly, the extrusion force between the heat conducting part and the electrode main body is reduced, the risk of mutual extrusion damage of the heat conducting part and the electrode main body is reduced, the service life of the heat conducting assembly is improved, and the reliability of the battery monomer is improved. In some embodiments, the side surfaces include two first side surfaces and two second side surfaces, the two first side surfaces are disposed opposite each other in the second direction, the two second side surfaces are disposed opposite each other in the third direction, the first direction, the second direction, and the third direction intersect each other two by two, the area of the first side surface is larger than the area of the second side surface, and the gap is located at the second side surface at least partially orthographic projection of the electrode assembly. In the scheme of the embodiment of the application, the gap is positioned on the second side surface in a mode of orthographic projection at least partially of the electrode assembly so as to reduce extrusion force of the end part of the heat conducting piece and the electrode assembly in the expansion process of the electrode assembly, improve the problem that the stress concentration of the end part of the he