CN-122003778-A - Battery, fastening structure, method for manufacturing battery, and method for manufacturing fastening structure

CN122003778ACN 122003778 ACN122003778 ACN 122003778ACN-122003778-A

Abstract

The battery comprises an electrode body (1), a current collector (15) connected with the electrode body (1), and an external terminal (11) connected with the current collector (15) in a laminated manner. The current collector (15) has a main body portion and a current collector plate portion connected to the main body portion. The main body has a through hole. A flange (21) is formed around the through hole of the body. The external terminal (11) has a collector connecting portion (11 b) inserted into the through hole of the main body portion, and an expanded diameter portion (11 c) connecting the collector connecting portion (11 b) in the stacking direction and having a larger dimension than the collector connecting portion (11 b) in the direction intersecting the stacking direction. The enlarged diameter portion (11 c) has a recess (23) formed at an end portion thereof facing the electrode body (1) in the stacking direction. The expanded diameter portion (11 c) has a contact portion contacting the flange (21) in a direction intersecting the lamination direction. In the cross section passing through the expanded diameter portion (11 c) and the contact portion, the expanded diameter portion (11 c) or the expanded diameter portion (11 c) and the collector connecting portion (11 b) has a first fixing portion for fixing the collector (15) in a direction intersecting the lamination direction and a2 nd fixing portion for fixing the collector (15) in the lamination direction. The first fixing portion has a wider structure than the second fixing portion. This can suppress deformation of the fastened member during production of the fastening structure, and provide a battery and a fastening structure having a high-quality fastening structure.

Inventors

TANAKA NOBUYOSHI
SHI YUSI

Assignees

日本汽车能源株式会社

Dates

Publication Date: 20260508
Application Date: 20250331
Priority Date: 20240903

Claims (16)

1.A battery, characterized by comprising: an electrode body; a current collector connected to the electrode body, and An external terminal connected to the collector stack, The current collector includes: A main body part, and A collector plate portion connected to the main body portion, The main body portion has a through-hole, A flange is formed around the through hole of the main body portion, The external terminal includes: A current collector connecting portion inserted into the through hole of the main body portion, and An expanded diameter portion connected to the current collector connecting portion in a stacking direction, the expanded diameter portion having a larger dimension than the current collector connecting portion in a direction intersecting the stacking direction, A recess is formed in an end of the expanded diameter portion opposite to the electrode body in the lamination direction, The expanded diameter portion has a contact portion contacting the flange in a direction intersecting the lamination direction, In a section through the expanded diameter portion and the contact portion, The expanded diameter portion, or the expanded diameter portion and the collector connecting portion, includes a first fixing portion that fixes the collector in a direction intersecting the lamination direction, and a second fixing portion that fixes the collector in the lamination direction, The first fixing portion has a wider structure than the second fixing portion.
2. The battery of claim 1, wherein the battery is configured to provide a battery of a battery type, Also comprises a gasket, a cover and an insulating block, The gasket, the cover and the insulating block have through holes, The gasket, the cover, and the insulating block are laminated in this order, are disposed between the external terminal and the current collector, The collector connecting portion of the external terminal is inserted into the through-hole of the gasket, the cover, and the insulating block, The gasket is provided with a sheath portion which, The sheath portion is disposed between an inner wall of the through hole of the cover and the collector connecting portion of the external terminal, The diameter of the expanded portion is smaller than the diameter of the through hole of the cover.
3. The battery of claim 1, wherein the battery is configured to provide a battery of a battery type, The collector connecting portion has a larger diameter at a portion closer to the expanded diameter portion than at a portion farther from the expanded diameter portion.
4. A fastening structure, comprising: A plurality of fastened parts having through holes, and A columnar member having an enlarged diameter portion, The plurality of fastened members are stacked in a state in which the through holes are aligned, The columnar member is inserted into the through hole, Forming a flange around the through hole of the fastened member constituting the outermost surface of one side among the plurality of fastened members of the laminate, The expanded diameter portion has a contact portion contacting the flange in a direction intersecting the stacking direction, In a section through the expanded diameter portion and the contact portion, The expanded diameter portion, or the expanded diameter portion and the columnar member include a first fixing portion that fixes the fastened member constituting the outermost surface in a direction intersecting the lamination direction, and a second fixing portion that fixes the fastened member constituting the outermost surface in the lamination direction, The first fixing portion has a wider structure than the second fixing portion.
5. The fastening structure according to claim 4, wherein, The diameter of the portion of the columnar member near the expanded diameter portion is larger than the diameter of the portion of the columnar member distant from the expanded diameter portion.
6. A method for manufacturing a battery, which comprises the steps of, The battery has: an electrode body; a current collector connected to the electrode body, and An external terminal connected to the current collector, The current collector includes a main body portion and a current collecting plate portion connected to the main body portion, The main body portion has a through-hole, A flange is formed around the through hole of the main body, The external terminal has a busbar connection portion and a collector connection portion, The manufacturing method of the battery is characterized in that, The collector connecting part of the external terminal is inserted into the through hole of the main body part of the collector, By pressing the caulking punch against the surface of the current collector connecting portion on the opposite side of the busbar connecting portion, a concave portion and an expanded diameter portion are formed in the current collector connecting portion.
7. A method for manufacturing a fastening structure body, The fastening structure includes: A plurality of fastened parts having through holes, and The columnar member is provided with a plurality of columnar members, The plurality of fastened members are stacked in a state in which the through holes are aligned, A flange is formed around the through hole of the fastened member constituting the outermost surface of one side among the plurality of fastened members of the laminate, The method for manufacturing the fastening structure is characterized in that, The columnar member is inserted into the through hole in which the plurality of fastened members are stacked, By pressing the surface of the columnar member exposed on the fastened member constituting the outermost surface with a caulking punch, a concave portion and an enlarged diameter portion are formed in the columnar member.
8. A battery, characterized in that, Comprises an electrode body, a housing for housing the electrode body, and a cover assembly, The cap assembly includes an external terminal, a gasket, a cap, an insulating block and a collector, The gasket, the cover, the insulating block, and the current collector have through holes to constitute a plurality of fastened members, The external terminal has a columnar portion, The gasket, the cover, the insulating block, and the current collector are stacked in this order in a state in which the through holes are aligned, The columnar portion is inserted into the through hole, At least a part of the outer peripheral portion of the expanded diameter portion of the columnar portion is in close contact with the inner wall of the through hole of the current collector, The top end of the diameter-expanding part is provided with a concave part, The recess has a trace of the pushing.
9. The battery of claim 8, wherein the battery is configured to provide the battery with a battery power, The tip end portion of the expanded diameter portion has an untouched surface.
10. The battery of claim 8, wherein the battery is configured to provide the battery with a battery power, A flange or countersink region is formed on the current collector, At least a portion of the outer peripheral portion of the expanded diameter portion is in close proximity to the flange or an inner wall of the countersink region.
11. A fastening structure, comprising: A plurality of fastened parts having through holes, and A columnar member having an enlarged diameter portion, The plurality of fastened members are stacked in a state in which the through holes are aligned, The columnar member is inserted into the through hole, At least a part of the outer peripheral portion of the expanded diameter portion of the columnar member is in close contact with an inner wall of the through hole of the fastened member constituting the one outermost surface of the plurality of fastened members, The top end of the diameter-expanding part is provided with a concave part, The recess has a trace of the pushing.
12. The fastening structure according to claim 11, wherein, The tip end portion of the expanded diameter portion has an untouched surface.
13. The fastening structure according to claim 11, wherein, A flange or countersink is formed on the fastened component constituting the outermost surface, At least a portion of the outer peripheral portion of the expanded diameter portion is in close proximity to the flange or an inner wall of the countersink region.
14. The fastening structure according to claim 11, wherein, The fastened member and the expanded diameter portion constituting the outermost surface are joined by a welded portion.
15. The fastening structure according to claim 14, wherein, The heights of the fastened members and the expanded diameter portions at the welded portions are substantially equal.
16. The fastening structure according to claim 11, wherein, The plurality of fastened components include washers, insulating blocks and current collectors, The columnar member is an external terminal.

Description

Battery, fastening structure, method for manufacturing battery, and method for manufacturing fastening structure Technical Field The present disclosure relates to a battery, a fastening structure, a method of manufacturing a battery, and a method of manufacturing a fastening structure. Background Conventionally, an electrode terminal of a battery is manufactured by pressing a terminal of a cap assembly in an axial direction of the terminal with a caulking tool or the like, and bringing the terminal into close contact with a plate material such as a laminated current collector. Patent document 1 discloses a method for manufacturing a secondary battery, in which, when caulking an internal terminal 6, a caulking tool 20 is used to press and deform a protruding portion 6a of the internal terminal 6 so as to expand in a radial direction, and further, the protruding portion 6a of the internal terminal 6 is deformed to form a caulking portion 21, whereby the internal terminal 6 is fixed to a through hole 4a of an external terminal 4. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2015-106501 Disclosure of Invention Problems to be solved by the invention In the method described in patent document 1, the caulking portion 21 is formed by pressing an upper portion of the protruding portion 6a that expands in the radial direction of the internal terminal 6 so as to be in close contact with the external terminal 4 in the pressing direction. In this case, it is desirable to suppress the case 2 from being deformed by the stacked cases 2 and the like being pressed. Even when the housing itself is not pressed, it is desirable to suppress deformation of the cover by sandwiching the cover as a fastened member. An object of the present disclosure is to provide a battery and a fastening structure that suppresses deformation of a fastened member at the time of manufacturing the fastening structure, and that has a high-quality fastening structure. Means for solving the problems The battery of the present disclosure has an electrode body, a current collector connected to the electrode body, and an external terminal connected to the current collector stack. The current collector includes a main body portion and a current collecting plate portion connected to the main body portion. The main body has a through hole. A flange is formed around the through hole of the main body. The external terminal includes a collector connecting portion inserted into the through hole of the main body portion, and an expanded diameter portion connected to the collector connecting portion in a stacking direction and having a larger dimension than the collector connecting portion in a direction intersecting the stacking direction. A recess is formed at an end of the expanded diameter portion opposite to the electrode body in the stacking direction. The expanded diameter portion has a contact portion that contacts the flange in a direction intersecting the stacking direction. In a cross section passing through the expanded diameter portion and the contact portion, the expanded diameter portion, or the expanded diameter portion and the current collector connecting portion, has a first fixing portion that fixes the current collector in a direction intersecting the lamination direction, and a2 nd fixing portion that fixes the current collector in the lamination direction. The first fixing portion has a wider structure than the second fixing portion. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, it is possible to provide a battery and a fastening structure that suppress deformation of a fastened member at the time of manufacturing the fastening structure, and that have a high-quality fastening structure. Drawings Fig. 1 is a perspective view showing a battery in which a lid is disassembled. Fig. 2 is a sectional view showing a fastening structure of embodiment 1. Fig. 3 is a sectional view showing a fastening structure of embodiment 2. Fig. 4 is a sectional view showing a state before the connecting portion is swaged in the process of manufacturing the fastening structure of example 1. Fig. 5 is a sectional view showing a fastening structure of embodiment 3. Fig. 6 is a sectional view showing a fastening structure of embodiment 4. Fig. 7 is an enlarged partial cross-sectional view showing the fastening structure of modification 1. Fig. 8 is an enlarged partial cross-sectional view showing the fastening structure of modification 2. Fig. 9 is an enlarged partial cross-sectional view showing the fastening structure of modification 3. Fig. 10 is an enlarged partial cross-sectional view showing the fastening structure of modification 4. Fig. 11 is an enlarged partial cross-sectional view showing the fastening structure of modification 5. Fig. 12 is an enlarged partial cross-sectional view showing the fastening structure of modification 6. Fig. 13 is an enlarged partial cross-sectional view showing t