KR-102964990-B1 - Tab welded structure, battery cell, and electrical equipment

KR102964990B1KR 102964990 B1KR102964990 B1KR 102964990B1KR-102964990-B1

Abstract

Embodiments of the present application provide a tab welded structure, a battery cell, and an electrical installation, and belong to the field of battery technology. The tab welded structure includes a tab formed by laminating a conductive member and a multilayer sheet along a first direction. The conductive member is welded to the tab to form a fusion region. Herein, the fusion region includes a first fusion region and a second fusion region. The first fusion region extends from the tab into the conductive member along the first direction. The second fusion region forms a boundary with the first fusion region, is located on the side of the first fusion region, and is configured to connect the first fusion region and the tab. The second fusion region acts to connect the first fusion region and the tab, which corresponds to the first fusion region and the tab being fused through the second fusion region; thus, the risk of cracking is reduced because the tab is directly connected to the first fusion region, and the robustness after the tab and the conductive member are welded is improved, thereby extending the service life of the battery cell.

Inventors

츠언 콩성
린 원파
원 야오링
린 지앙
탕 밍하오
린 지아

Assignees

컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드

Dates

Publication Date: 20260513
Application Date: 20211029

Claims (18)

As a tap weld structure, A tab formed by stacking multilayer sheets along a first direction; and A conductive member welded to the above tab to form a fusion area; Includes, The above-mentioned fusion area is, A first fusion portion extending from the tab into the conductive member along the first direction; and A second fusion portion forming a boundary with the first fusion portion, wherein a boundary surface is formed at the connection position between the first fusion portion and the second fusion portion, the second fusion portion is located on the side of the first fusion portion, and the second fusion portion is configured to electrically connect the first fusion portion and the tab; Includes, In the first direction above, the second fusion portion is a tab welding structure in which the tab does not extend along the direction in which the tab faces the conductive member.
In paragraph 1, A tap weld structure in which, in the first direction above, the fusion depth of the second fusion portion is smaller than the fusion depth of the first fusion portion.
delete
In paragraph 1, A tap welding structure in which the welding temperature for forming a second fusion portion by welding the conductive member and the tab is lower than the welding temperature for forming a first fusion portion by welding the conductive member and the tab.
In paragraph 1, A tap welding structure in which the second fusion section is installed on the outer side of the first fusion section, and the second fusion section is extended and distributed along the circumferential direction of the first fusion section.
In paragraph 1, A tab welding structure in which, in the first direction above, the tab and the conductive member are installed in a stacked manner, and the first fusion portion penetrates the tab and partially extends into the conductive member.
In paragraph 1, In the second direction, the second fusion part is installed on at least one side of the first fusion part; The second direction is a tab weld structure perpendicular to the first direction.
In paragraph 1, The above conductive member is, A main body having a contact surface; and It includes a convex portion protruding from the above contact surface; A tab welding structure in which the above tab is in contact with the above contact surface along the above first direction, a welding seam is formed between the above tab and the above convex portion in the second direction, the above fusion area is formed in the welding seam, and the above second direction is perpendicular to the above first direction.
A battery cell comprising a tab welding structure according to any one of paragraphs 1 to 2 and 4 to 8.
In Paragraph 9, The battery cell comprises an electrode terminal, the electrode terminal is electrically connected to the tab, and the electrode terminal is the conductive member of the battery cell.
In Paragraph 9, The above battery cell is, Electrode terminals; and A battery cell comprising a current collecting member for connecting the electrode terminal and the tab to realize an electrical connection between the electrode terminal and the tab, wherein the current collecting member is the conductive member.
Battery cell pursuant to Paragraph 9; and A battery comprising a case that accommodates the above battery cells.
Electrical equipment including a battery pursuant to Paragraph 12.
As a tap welding method, A step of providing an electrode assembly having a tab formed by stacking multilayer sheets along a first direction; Step of providing a conductive member; and A step of forming a fusion region by welding the above tab and the above conductive member; Includes, The above-mentioned fusion area is, A first fusion portion extending from the tab into the conductive member along the first direction; and A second fusion portion forming a boundary with the first fusion portion, wherein a boundary surface is formed at the connection position between the first fusion portion and the second fusion portion, the second fusion portion is located on the side of the first fusion portion, and the second fusion portion is configured to electrically connect the first fusion portion and the tab; Includes, A tab welding method in which, in the first direction above, the second fusion portion does not exceed the tab along the direction in which the tab faces the conductive member.
In Paragraph 14, The step of welding the above tab and the above conductive member to form a fused area is, A step of forming the first fused portion by first welding the above tab and the above conductive member; and The step of forming the second fused portion by secondarily welding the tab and the conductive member; A tap welding method in which the welding temperature of the above secondary welding is lower than the welding temperature of the above primary welding.
In paragraph 15, The step of secondary welding the above tab and the above conductive member is, A tap welding method comprising the step of forming the second fused portion by round welding the tab and the conductive member from the inside to the outside several times along the circumferential direction.
In Paragraph 16, A tap welding method in which the welding temperature of each round is gradually reduced from the inside to the outside.
As a tap welding machine, A first providing device for providing an electrode assembly having a tab formed by stacking multilayer sheets along a first direction; A second providing device that provides a conductive member; and A welding device that welds the above tab and the conductive member so that the tab and the conductive member form a fusion region; Includes, The above fusion area is, A first fusion portion extending from the tab into the conductive member along the first direction; and A second fusion portion forming a boundary with the first fusion portion, wherein a boundary surface is formed at the connection position between the first fusion portion and the second fusion portion, the second fusion portion is located on the side of the first fusion portion, and the second fusion portion is configured to electrically connect the first fusion portion and the tab; Includes, A tap welding device in which, in the first direction above, the second fusion portion does not extend beyond the tap along the direction in which the tap faces the conductive member.

Description

Tab welded structure, battery cell, and electrical equipment This application relates to the field of battery technology, specifically to a tab welding structure, a battery cell, and an electrical installation. Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles have become an important component of this development due to their energy-saving and eco-friendly advantages. In the case of electric vehicles, battery technology is a crucial factor in their development. In the case of conventional battery cells, tabs are welded to conductive members (current collectors, electrode terminals, etc.) to output electrical energy. Currently, the tabs and conductive members easily separate after welding, affecting the battery cell's lifespan. To more clearly explain the technical solution of the embodiments of the present application, a brief introduction to the drawings to be used in the embodiments below is provided. The drawings described below are merely some embodiments of the present application and should not be understood as a limitation on the scope. It should be understood by those skilled in the art that other drawings can be obtained from the drawings without any inventive creation. FIG. 1 is a schematic diagram of the structure of a vehicle provided by some embodiments of the present application. FIG. 2 is a schematic diagram of the structure of a battery provided by some embodiments of the present application. FIG. 3 is an exploded view of a battery cell provided by some embodiment of the present application. FIG. 4 is a cross-sectional view of a tab weld structure provided by some embodiments of the present application. Figure 5 is a plan view of the tab weld structure shown in Figure 4. FIG. 6 is a cross-sectional view of a tab weld structure provided by some other embodiment of the present application. Figure 7 is a plan view of the tab weld structure shown in Figure 6. FIG. 8 is a welding structure diagram of a tab and electrode terminal of a battery cell provided by some embodiment of the present application. FIG. 9 is a welding structure diagram of a tab and electrode terminal of a battery cell provided by another embodiment of the present application. FIG. 10 is a flowchart of a tap welding method provided by some embodiments of the present application. FIG. 11 is a flowchart of a tap welding method provided by some other embodiment of the present application. FIG. 12 is a welding trajectory of a conductive member and a tab provided by some embodiments of the present application. FIG. 13 is an exemplary block diagram of a tap welding device provided by some embodiments of the present application. In order to more clearly explain the purpose, technical solution, and advantages of the embodiments of the present application, the technical solution according to the embodiments of the present application will be clearly described below in conjunction with the drawings of the embodiments of the present application. It is obvious that the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments obtained based on the embodiments of the present application, under the premise that those skilled in the art do not perform creative labor, are all within the scope of protection of the present application. Unless otherwise defined, technical or scientific terms used in this application shall have a general meaning that can be understood by those skilled in the art; terms used in the specification of this application are intended to describe specific embodiments and are not intended to limit this application; and terms “include” and “comprising” and any variations thereof in the specification and claims of this application and in the description of the accompanying drawings are intended to include non-exclusive inclusions. Terms “first,” “second,” etc. in the specification and claims of this application or in the drawings are intended to distinguish different objects and are not intended to describe a specific order or master-slave relationship. The term “Example” as used in this application means that a specific feature, structure, or characteristic described in connection with the Example is included in at least one Example of this application. Where the word appears at each location in the specification, it does not necessarily mean the same Example, nor does it mean an independent or alternative Example excluded from other Examples. In the description of this application, it must be explained that, without other explicit provisions or limitations, the terms “mount,” “connect,” “connect,” and “attach” are to be understood in a broad sense and may, for example, be fixed connections, detachable connections, or integral connections; may be directly connected to each other, connected to each other through an intermediate medium, or connected within two elements. To those sk