CN-122000486-A - Electrode body

Abstract

The present invention relates to an electrode body. The electrode device is provided with a1 st electrode part comprising a plurality of 1 st laminated parts and a plurality of 1 st bent parts, wherein the 1 st electrode part comprises a1 st electrode sheet, and a2 nd electrode part comprises a plurality of 2 nd laminated parts, the 1 st laminated parts and the 2 nd laminated parts are alternately arranged in the lamination direction, the 1 st electrode sheet comprises a1 st sheet part and a1 st active material layer, the 1 st sheet part comprises a part forming the 1 st laminated part formed by a1 st metal foil and a part forming the 1 st bent parts formed by a1 st resin member, the 1 st laminated part comprises a1 st metal foil and a1 st active material layer arranged on the 1 st metal foil, and the 1 st active material layer is not arranged on the 1 st resin member.

Inventors

• TATEISHI TAKASHI
• UEDA MASASHI
• He Quanrun
• Mashioka Shizuka
• SATO REI
• KATAYAMA YUJI
• YAMAMOTO YASUNARI
• MACHIDA KEITARO

Assignees

• 丰田自动车株式会社
• 丰田电池有限公司

Dates

Publication Date

20260508

Application Date

20251031

Priority Date

20241106

Claims (5)

1. 1. An electrode body for a secondary battery, comprising: A1 st electrode part composed of 1 st electrode sheet, and A2 nd electrode portion having a polarity different from that of the 1 st electrode portion, The 1 st electrode sheet includes a plurality of 1 st laminated portions arranged in a laminated direction and a plurality of 1 st bent portions, Each of the plurality of 1 st bending portions connects the 1 st lamination portions adjacent in the lamination direction, The 2 nd electrode part has a plurality of 2 nd laminated parts, In the lamination direction, the plurality of 1 st lamination portions and the plurality of 2 nd lamination portions are alternately arranged, The 1 st electrode sheet includes a 1 st sheet portion and a 1 st active material layer provided on the 1 st sheet portion, The 1 st sheet portion is constituted of a1 st metal foil, The portion of the 1 st sheet portion constituting the plurality of 1 st bent portions is constituted by a 1 st resin member, The 1 st laminated part has the 1 st metal foil and the 1 st active material layer provided on the 1 st metal foil, The 1 st active material layer is not provided on the 1 st resin member.
2. 2. The electrode body according to claim 1, The 2 nd electrode part is composed of a2 nd electrode plate, The 2 nd electrode sheet includes the plurality of 2 nd laminated portions and a plurality of 2 nd bent portions arranged in the lamination direction, Each of the plurality of 2 nd bent portions connects the 2 nd laminated portions adjacent in the lamination direction, The 2 nd electrode sheet includes a2 nd sheet portion and a2 nd active material layer provided on the 2 nd sheet portion, The portion of the 2 nd sheet portion constituting the 2 nd laminated portion is constituted by a2 nd metal foil, The portion of the 2 nd sheet portion constituting the plurality of 2 nd bent portions is constituted by a2 nd resin member, The 2 nd laminated portion has the 2 nd metal foil and the 2 nd active material layer provided on the 2 nd metal foil, The 2 nd active material layer is not provided on the 2 nd resin member.
3. 3. The electrode body according to claim 2, The thickness of the 2 nd resin member is thinner than the 2 nd metal foil.
4. 4. The electrode body according to any one of claim 1 to 3, The 1 st resin member has a thickness thinner than the 1 st metal foil.
5. 5. The electrode body according to claim 1, Further comprises an insulating film covering a part of the periphery of the plurality of 1 st laminated parts and the plurality of 2 nd laminated parts, The plurality of 1 st bending portions are exposed from the insulating film.

Description

Electrode body Technical Field The present disclosure relates to an electrode body for a secondary battery. Background As a conventional electrode body, japanese patent application laid-open No. 2023-504474 discloses a structure in which a1 st electrode tab is bent into a multi-layer structure (meandering shape) in an electrode body composed of a1 st electrode tab and a 2 nd electrode tab. The 1 st electrode sheet includes a plurality of 1 st laminated portions and a plurality of bent portions connecting the 1 st laminated portions adjacent in the lamination direction. The 1 st electrode sheet includes an insulating base, a conductive layer provided on the insulating base, and an active material layer provided on the conductive layer. Disclosure of Invention In an electrode body in which the 1st electrode tab is bent into a multilayer structure (meandering shape), a high stress is easily applied to the bent portion of the 1st electrode tab. When the insulating base body located at the bent portion is provided with the conductive layer and the active material layer, the bent portion becomes hard, and when stress is applied to the bent portion, the bent portion is easily broken. The present disclosure has been made in view of the above-described problems, and an object of the present disclosure is to provide an electrode body in which breakage of a bent portion can be suppressed in a structure including a1 st electrode sheet having a plurality of 1 st laminated portions and a plurality of bent portions connecting the 1 st laminated portions adjacent in a lamination direction. An electrode body based on the present disclosure is an electrode body for a secondary battery. The electrode body includes a 1 st electrode portion formed of a 1 st electrode sheet and a 2 nd electrode portion having a polarity different from that of the 1 st electrode portion. The 1 st electrode sheet includes a plurality of 1 st laminated portions and a plurality of 1 st bent portions arranged in a laminated direction. Each of the plurality of 1 st bending portions connects the 1 st laminated portions adjacent to each other in the lamination direction. The 2 nd electrode portion has a plurality of 2 nd laminated portions. In the stacking direction, the plurality of 1 st stacking portions and the plurality of 2 nd stacking portions are alternately arranged. The 1 st electrode sheet includes a 1 st sheet portion and a 1 st active material layer provided on the 1 st sheet portion. The 1 st sheet portion is formed of a 1 st metal foil. The 1 st piece portion is formed of a 1 st resin member in a portion constituting the 1 st bending portion. The 1 st laminated portion includes the 1 st metal foil and the 1 st active material layer provided on the 1 st metal foil. The 1 st active material layer is not provided on the 1 st resin member. According to the above configuration, in the structure in which the 1 st electrode sheet is bent in a zigzag shape, the 1 st bent portion is constituted only by the resin member. Therefore, when stress is applied to the 1 st bending portion, the resin member is deformed by bending, and thus the 1 st bending portion is prevented from cracking or breaking. In the electrode body according to the present disclosure, the 2 nd electrode portion may be constituted by a2 nd electrode sheet. The 2 nd electrode sheet may include the plurality of 2 nd laminated portions and the plurality of 2 nd bent portions arranged in the lamination direction. Each of the plurality of 2 nd bending portions may connect the 2 nd laminated portions adjacent to each other in the lamination direction. The 2 nd electrode sheet may include a2 nd sheet portion and a2 nd active material layer provided on the 2 nd sheet portion. The part of the 2 nd sheet portion constituting the 2 nd laminated portion may be formed of a2 nd metal foil. The portion of the 2 nd sheet portion constituting the plurality of 2 nd bent portions may be constituted by a2 nd resin member. The 2 nd laminated portion may include the 2 nd metal foil and the 2 nd active material layer provided on the 2 nd metal foil. The 2 nd active material layer is not provided on the 2 nd resin member. According to the above configuration, in the structure in which the 2 nd electrode sheet is bent in a zigzag shape, the 2 nd bent portion is constituted only by the resin member. Therefore, when stress is applied to the 2 nd bending portion, the resin member is deformed by bending, and thus occurrence of cracking in the 2 nd bending portion and breakage of the 2 nd bending portion can be suppressed. In the electrode body according to the present disclosure, the thickness of the 2 nd resin member may be thinner than the 2 nd metal foil. According to the above configuration, the 2 nd resin member is thin, and thus the 2 nd resin member is easily bendable. In the electrode body according to the present disclosure, the 1 st resin member may have a thickness thinner than the 1 st metal foil.