KR-20260068004-A - ELECTRODE ASSEMBLY

KR20260068004AKR 20260068004 AKR20260068004 AKR 20260068004AKR-20260068004-A

Abstract

The electrode body comprises a first electrode part formed by a first electrode sheet including a plurality of first laminated parts and a plurality of first curved parts, and a second electrode part having a plurality of second laminated parts, wherein the plurality of first laminated parts and the plurality of second laminated parts are alternately arranged in the lamination direction, and the first electrode sheet comprises a first sheet part formed by a first metal foil and including a portion forming a first laminated part and a portion formed by a first resin member and including a portion forming a plurality of first curved parts, and a first active material layer, wherein the first laminated part has a first metal foil and a first active material layer provided on the first metal foil, and the first active material layer is not provided on the first resin member.

Inventors

다테이시 미츠루
우에다 마사시
이즈미 준
마스오카 시즈카
사토 아야
가타야마 유지
야마모토 다츠야
마치다 게이타로

Assignees

도요타 지도샤（주）

Dates

Publication Date: 20260513
Application Date: 20251104
Priority Date: 20241106

Claims (5)

As an electrode used in a secondary battery, A first electrode part formed by a first electrode sheet, and It is equipped with a second electrode part having a polarity different from that of the first electrode part, and The first electrode sheet comprises a plurality of first laminated portions arranged side by side in the lamination direction and a plurality of first curved portions, and Each of the plurality of first curved portions above connects the first stacked portions adjacent to each other in the stacking direction, and The second electrode portion above has a plurality of second stacked portions, and In the above stacking direction, the plurality of first stacking parts and the plurality of second stacking parts are alternately arranged, and The first electrode sheet comprises a first sheet portion and a first active material layer provided on the first sheet portion, and The portion constituting the first laminated portion among the first sheet portions is composed of a first metal foil, and The portion constituting the plurality of first curved portions among the first sheet portions is composed of a first resin member, and The first laminated portion comprises the first metal foil and the first active material layer provided on the first metal foil, and The first active material layer is an electrode body that is not provided on the first resin member.
In Article 1, The second electrode portion is composed of a second electrode sheet, and The second electrode sheet comprises a plurality of second laminated portions arranged side by side in the lamination direction and a plurality of second curved portions, and Each of the plurality of second curved portions above connects the second stacked portions adjacent to each other in the stacking direction, and The second electrode sheet comprises a second sheet portion and a second active material layer provided on the second sheet portion, and The portion constituting the second laminated portion among the second sheet portions is composed of a second metal foil, and The portion constituting the plurality of second curved portions among the second sheet portions is composed of a second resin member, and The second laminated portion comprises the second metal foil and the second active material layer provided on the second metal foil, and The above second active material layer is an electrode body that is not provided on the above second resin member.
In Article 2, The thickness of the second resin member is thinner than the second metal foil, forming an electrode body.
In any one of paragraphs 1 to 3, The thickness of the first resin member is thinner than the first metal foil, forming an electrode body.
In Article 1, Further comprising an insulating film covering a portion of the periphery of the plurality of first laminated portions and the plurality of second laminated portions, The plurality of first curved portions are electrode bodies exposed from the insulating film.

Description

Electrode Assembly The present disclosure relates to an electrode body used in a secondary battery. As a conventional electrode body, Japanese Patent Publication No. 2023-504474 discloses an electrode body composed of a first electrode sheet and a second electrode sheet, wherein the first electrode sheet is folded into a multilayer structure (zigzag shape). The first electrode sheet includes a plurality of first laminated portions and a plurality of curved portions connecting adjacent first laminated portions in the lamination direction. The first electrode sheet includes an insulating substrate, a conductive layer provided on the insulating substrate, and an active material layer provided on the conductive layer. In an electrode body in which the first electrode sheet is folded into a multilayer structure (zigzag shape), high stress is easily applied to the curved portion of the first electrode sheet. When a conductive layer and an active material layer are provided in an insulating substrate located at the curved portion, the curved portion becomes rigid, and when stress is applied to the curved portion, the curved portion is prone to breaking. The present disclosure is made in consideration of the above-mentioned problems, and the objective of the present disclosure is to provide an electrode body capable of suppressing damage to the curved portions in a structure comprising a plurality of first laminated portions and a plurality of curved portions connecting the first laminated portions adjacent in the lamination direction. The electrode body according to the present disclosure is used in a secondary battery. The electrode body comprises a first electrode portion formed by a first electrode sheet and a second electrode portion having a polarity different from that of the first electrode portion. The first electrode sheet includes a plurality of first laminated portions arranged side by side in a lamination direction and a plurality of first curved portions. Each of the plurality of first curved portions connects the first laminated portions adjacent to each other in the lamination direction. The second electrode portion has a plurality of second laminated portions. In the lamination direction, the plurality of first laminated portions and the plurality of second laminated portions are arranged alternately. The first electrode sheet includes a first sheet portion and a first active material layer provided on the first sheet portion. The portion of the first sheet portion constituting the first laminated portion is composed of a first metal foil. The portion of the first sheet portion constituting the plurality of first curved portions is composed of a first resin member. The first laminated portion comprises the first metal foil and the first active material layer provided on the first metal foil. The first active material layer is not provided on the first resin member. According to the above configuration, in a structure in which the first electrode sheet is bent in a zigzag shape, the first curved portion is composed solely of a resin member. Therefore, when stress is applied to the first curved portion, the resin member undergoes bending deformation, thereby preventing cracking or fracture of the first curved portion. In the electrode body according to the present disclosure, the second electrode portion may be composed of a second electrode sheet. The second electrode sheet may include a plurality of second laminated portions arranged side by side in the lamination direction and a plurality of second curved portions. Each of the plurality of second curved portions may connect the second laminated portions adjacent in the lamination direction. The second electrode sheet may include a second sheet portion and a second active material layer provided on the second sheet portion. The portion of the second sheet portion constituting the second laminated portion may be composed of a second metal foil. The portion of the second sheet portion constituting the plurality of second curved portions may be composed of a second resin member. The second laminated portion may have the second metal foil and the second active material layer provided on the second metal foil. The second active material layer is not provided on the second resin member. According to the above configuration, in a structure in which the second electrode sheet is folded in a zigzag shape, the second curved portion is composed solely of a resin member. Therefore, when stress is applied to the second curved portion, the resin member undergoes bending deformation, thereby preventing cracking or fracture of the second curved portion. In the electrode body according to the present disclosure above, the thickness of the second resin member may be thinner than the second metal foil. According to the above configuration, the second resin member becomes easy to bend as the second resin member is thin. In the electrode body according to the present d