A double riveting structure, an electrode terminal structure, an integrated top cover, and a cylindrical battery

Abstract

The utility model discloses a double riveting structure, electrode terminal structure, integrated top cover and cylindrical battery, including pole and rivet, the pole is provided with the center through -hole, and the one end of center through -hole is as first abutment end, and the other end of center through -hole is as first riveting end, rivet is arranged at the center through -hole, and the end of rivet is as second abutment end close to first riveting end, and the end of rivet is as second riveting end away from first riveting end, and first riveting end riveting forms first riveting end surface, and second abutment end is abutted on first riveting end surface, and second riveting end is riveted on first abutment end and forms second riveting end surface, the utility model discloses riveting with the pole first, and rivet and pole riveting second, enhance riveting strength of riveting position, reduce the degree of deformation of cover plate riveting position by internal pressure, make its this area resist the ability of outside impact to strengthen, to reach the purpose of avoiding electrode terminal spouts and causes secondary damage.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a double riveting structure, an electrode terminal structure, and a cylindrical battery. Background Technology

[0002] Currently, the electrode terminals of 46-series large cylindrical lithium-ion batteries on the market are usually riveted to the end face of the casing. When the battery is charged and discharged in a humid and hot environment, or when the exposed positive and negative electrodes come into direct contact with metal or other conductors, or when the insulation layer between the exposed positive and negative electrodes is damaged by external impact, an external short circuit will occur. The instantaneous ultra-large current will cause local overheating, causing the internal temperature of the battery to rise rapidly. There is a risk of sparks igniting the electrolyte and causing the battery to burn, or the internal pressure to rise rapidly and cause the battery to explode. It may even cause the casing to be deformed under pressure, causing the electrode terminals to be ejected and causing secondary damage. Utility Model Content

[0003] This invention provides a double-riveting structure, an electrode terminal structure, and a cylindrical battery to address the shortcomings described in the prior art.

[0004] The technical solution adopted in this utility model is as follows: A double-riveting structure includes a pole and a rivet. The pole has a central through hole, one end of which serves as a first abutment end, and the other end as a first riveting end. The rivet passes through the central through hole, with the end of the rivet closer to the first riveting end serving as a second abutment end, and the end of the rivet further away from the first riveting end serving as a second riveting end. The first riveting end forms a first riveting end face after riveting. The second abutment end abuts against the first riveting end face, forming a second riveting end face. The central through hole provides an assembly channel for the rivet. The pole is riveted to the assembly position, and the rivet performs a second riveting, achieving double riveting, improving riveting strength, reducing the degree of deformation at the riveting position under internal pressure, and solving the problem of secondary damage caused by electrode terminal ejection.

[0005] In a preferred embodiment of this utility model, the pole includes a pole base plate and a pole body. The pole body is perpendicular to the pole base plate and is T-shaped overall. The pole body has a first assembly section and a first riveting section. The first assembly section has a first through hole, and the first riveting section has a second through hole. The width of the second through hole is greater than the width of the first through hole. The pole base plate has a third through hole, and the third through hole, the first through hole, and the second through hole communicate to form a central through hole. The pole base plate serves as the first abutting end. The end face of the pole base plate near the pole body serves as the first abutting end face I, and the end face of the pole base plate away from the pole body serves as the first abutting end face II. The second riveting end is riveted to the first abutting end face II. The first riveting section serves as the first riveting end. The second through hole facilitates riveting, allowing the first riveting section to be quickly pressed into the first riveting end face by the riveting equipment.

[0006] As a preferred embodiment of this utility model, the end face of the pole base plate away from the pole body is provided with a riveting groove, and the second riveting end face is located in the second riveting groove.

[0007] In a preferred embodiment of this utility model, the rivet includes a rivet head and a rivet shank. The rivet shank is vertically disposed on the rivet head, and the rivet head serves as the second abutment end. A riveting hole is provided at the end of the rivet shank away from the rivet head, and the part of the rivet shank where the riveting hole is located is the rivet tail, which is the second riveting end. The function of the riveting hole is similar to that of the second through hole, facilitating the pressing into the second riveting end face. The remaining part of the rivet shank serves as the second assembly section. The second assembly section passes through the central through hole, specifically located within the first through hole and the third through hole.

[0008] This utility model also provides an electrode terminal structure, including an upper plastic, a cover plate, a sealing ring, a lower plastic, and a double riveting structure. The double riveting structure is the aforementioned double riveting structure. The first abutting end of the electrode post abuts against the upper plastic, and the first riveting end passes through the upper plastic, the cover plate, and the sealing ring before being riveted to the lower plastic. The second abutting end of the rivet abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end. The electrode post, as the first riveting, rivets the upper plastic, the cover plate, the sealing ring, and the lower plastic together. The rivet, as the second riveting, rivets with the electrode post to enhance the riveting strength of the electrode post. The double riveting can increase the riveting strength between the electrode post and the cover plate, and can also reduce the degree of deformation of the cover plate at the riveting position under internal pressure, thereby strengthening the ability of this area to resist external impact, so as to avoid secondary damage caused by the electrode terminal being ejected.

[0009] As a preferred embodiment of this utility model, the first abutting end of the pole post abuts against the lower plastic, and the first riveting end passes through the lower plastic, the sealing ring and the cover plate and is riveted to the upper plastic; the second abutting end of the rivet abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end.

[0010] In a preferred embodiment of this utility model, the cover plate is provided with explosion-proof markings and through holes. The through holes are located at the center of the cover plate and serve as a passage for the electrode post. The explosion-proof markings are arranged around the through holes. The explosion-proof markings are a thinning area of ​​the cover plate, which facilitates pressure relief when the internal pressure of the battery reaches a threshold, ensuring battery safety. The through holes provide a riveting channel for the electrode post, and the side end face of the cover plate is welded to the shell to seal the shell.

[0011] As a preferred embodiment of this utility model, an injection hole is provided on the cover plate, which serves as an injection channel for the electrolyte.

[0012] This utility model also provides an integrated top cover, including the above-mentioned electrode terminal structure and current collector, wherein the current collector is welded to the first riveting end face or the first abutting end of the pole.

[0013] This utility model also provides a cylindrical battery, including a current collector, a casing, and a battery cell. The battery cell is disposed inside the casing, and the casing has at least one end welded with the aforementioned electrode terminal structure. The current collector is welded to the first riveting end face or the first abutting end of the electrode post. The cover plate side end face of the electrode terminal structure is welded to the casing to seal the casing.

[0014] As a preferred embodiment of this utility model, the above-mentioned electrode terminal structure is welded to one end of the housing, one electrode of the battery cell is welded to the current collector, and the other electrode of the battery cell is welded to the inner wall of the housing or another current collector provided inside the housing.

[0015] This utility model uses a pole post for the first riveting and a rivet to the pole post for the second riveting, which enhances the riveting strength at the riveting position, reduces the degree of deformation of the cover plate at the riveting position under internal pressure, and strengthens the ability of this area to resist external impact, so as to avoid secondary damage caused by the electrode terminal being ejected. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the double riveting structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the pole of this utility model.

[0019] Figure 3 This is a cross-sectional view of the pole of this utility model.

[0020] Figure 4 This is a structural schematic diagram of the rivet of this utility model.

[0021] Figure 5 This is a cross-sectional view of the rivet of this utility model.

[0022] Figure 6 This is a schematic diagram of the assembly of the electrode terminals and the current collector of this utility model.

[0023] Figure 7 for Figure 6 A magnified view of a portion of region A in the middle.

[0024] Figure 8 This is an exploded view of the cylindrical battery of this utility model.

[0025] Figure 9This is a schematic diagram of the structure of the cover plate of this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] This utility model provides an embodiment of a double riveting structure, including a pole post 1 and a rivet 2. The pole post 1 is provided with a central through hole, one end of the central through hole serves as a first abutting end, and the other end of the central through hole serves as a first riveting end. Specifically, such as Figure 2 and 3 As shown, the electrode post 1 includes an electrode post base plate 11 and an electrode post body 12. The electrode post body 12 is perpendicular to the electrode post base plate 11 and is T-shaped. The electrode post body 12 has a first assembly section 121 and a first riveting section 122. The first assembly section 121 has a first through hole 1211, and the first riveting section 122 has a second through hole 1221. The width of the second through hole 1221 is greater than the width of the first through hole 1211. The electrode post base plate 11 has a third through hole 111. The third through hole 111, the first through hole 1211, and the second through hole 1221 communicate to form a central through hole. The electrode post base plate 11 serves as the first abutting end, and the end face of the electrode post base plate 11 near the electrode post body 12 serves as the first abutting end face I. The first abutting end face I abuts against the upper or lower plastic. When not used on a battery, it can abut against the end face of the device to be riveted. This embodiment is applied in the field of cylindrical batteries.

[0028] The end face of the pole base plate 11 away from the pole body 12 serves as the first abutting end face II. In order to ensure that the riveted end face is flush, the first abutting end face II is provided with a riveting groove 112. The second riveting end is riveted into the riveting groove of the first abutting end face II to form the second riveting end face, that is, the second riveting end face is located in the second riveting groove.

[0029] The first riveting section 122 serves as the first riveting end, and the second through hole facilitates riveting, allowing the first riveting section to be quickly pressed into the first riveting end face by the riveting equipment.

[0030] Rivet 2 is inserted through the central through hole, with the end of rivet 2 closest to the first riveting end serving as the second abutment end, and the end of rivet 2 furthest from the first riveting end serving as the second riveting end; the first riveting end forms the first riveting end face after riveting; the second abutment end abuts against the first riveting end face, and the second riveting end is riveted onto the first abutment end to form the second riveting end face, as shown. Figure 1As shown, the central through hole provides an assembly channel for the rivet. The pole is riveted to the assembly position, and the rivet is riveted a second time, achieving double riveting. This improves the riveting strength, reduces the degree of deformation of the riveting position under internal pressure, and solves the problem of secondary damage caused by electrode terminal ejection.

[0031] Specifically, such as Figure 4 and 5 As shown, the rivet 2 includes a rivet head 21 and a rivet shank 22. The rivet shank 22 is vertically disposed on the rivet head 21, and the rivet head 21 serves as the second abutting end. The second abutting end abuts against the first riveting end face. The end of the rivet shank 22 away from the rivet head 21 is provided with a riveting hole 221. The riveting hole has a similar function to the second through hole, which facilitates pressing into the second riveting end face. The part of the rivet shank 22 where the riveting hole is located is the rivet tail 23, which is the second riveting end. The remaining part of the rivet shank 22 serves as the second assembly section 222. The second assembly section 222 passes through the central through hole, specifically located in the first through hole and the third through hole.

[0032] The double-riveting structure is applied in the battery field, providing an embodiment of an electrode terminal structure, such as... Figure 6 and 7 As shown, it includes an upper plastic component 3, a cover plate 4, a sealing ring 5, a lower plastic component 6, and a double-riveted structure, as follows. Figure 9 As shown, the cover plate 4 is provided with an explosion-proof etched line 41, a through hole 42, and an electrolyte injection hole 43. The through hole 42 is located at the center of the cover plate and serves as a passage for the electrode post 1. The explosion-proof etched line 41 is arranged around the through hole. The explosion-proof etched line 41 is the thinning area of ​​the cover plate. In this embodiment, a C-shaped groove structure is adopted to facilitate pressure relief when the internal pressure of the battery reaches the threshold, ensuring the safety of the battery. The through hole provides a riveting channel for the electrode post, and the side end face of the cover plate is welded to the shell to seal the shell. The electrolyte injection hole 43 serves as the electrolyte injection channel and is arranged opposite to the explosion-proof etched line 41. After the electrolyte injection is completed, it is sealed by welding with a sealing nail 10.

[0033] During riveting, the electrode post can be inserted from top to bottom, and the corresponding rivet from bottom to top. Specifically, the first abutting end of the electrode post 1 abuts against the upper plastic 3, and the first riveting end passes through the upper plastic 3, cover plate 4, and sealing ring 5 before being riveted to the lower plastic 6. The second abutting end of the rivet 2 abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end. In application, the collector plate 7 is welded to the first riveting end face of the electrode post, forming an integrated top cover. The electrode post, as the first riveting, rivets the upper plastic, cover plate, sealing ring, and lower plastic together. The rivet, as the second riveting, rivets the electrode post to enhance the riveting strength. The double riveting increases the riveting strength between the electrode post and the cover plate and reduces the degree of deformation of the cover plate at the riveting position under internal pressure, thus strengthening the area's resistance to external impacts and preventing secondary damage caused by electrode terminal ejection.

[0034] Alternatively, the pole can be inserted from bottom to top, and the rivet from top to bottom. Figure 6 and 7 The example demonstrates the electrode post extending from bottom to top. The first abutting end of electrode post 1 abuts against the lower plastic 6. The first riveting end passes through the lower plastic 6, the sealing ring 5, and the cover plate 4 before being riveted to the upper plastic 3. A riveting groove is provided on the upper plastic 3. The second abutting end of rivet 2 abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end. In application, the first abutting end of the electrode post is welded to the current collector 7, serving as another type of integrated top cover. Figure 6 and 7 The manifold shown is only a schematic of one structure; not all manifolds extend beyond the cover plate.

[0035] To prevent rotation, the nail cap and electrode base plate can be made into shapes such as chamfered circles or rounded rectangles. The shapes of the upper and lower plastic parts are also adjusted accordingly to provide anti-rotation capability for the electrode terminals. This avoids unreliable stability due to twisting at the riveted connection, reduces the risk of the electrode and insulation seal being rotated, causing seal failure at the connection, electrolyte leakage, or even safety accidents.

[0036] This utility model also provides an embodiment of a cylindrical battery, such as... Figure 8 As shown, the device includes a current collector 7, a housing 8, and a battery cell 9. The battery cell 9 is disposed inside the housing 8. The housing 8 can be open at both ends or open at one end. The open end can be welded with the aforementioned electrode terminal structure. The first contact end face of the electrode terminal structure is welded to the current collector 7. The cover plate side end face of the electrode terminal structure is welded to the housing to seal the housing.

[0037] This embodiment demonstrates an example with one end open. One end of the housing 8 is welded with the aforementioned electrode terminal structure, and one electrode terminal of the battery cell is welded to the current collector 7. The current collector does not extend beyond the cover plate and is connected to... Figure 6 The different current collector structures shown are adapted by welding the other electrode of the battery cell to the inner wall of the housing 8 or another current collector 7 set inside the housing 8.

[0038] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A double-riveting structure, characterized in that: It includes a pole post (1) and a rivet (2). The pole post (1) is provided with a central through hole. One end of the central through hole serves as a first abutment end, and the other end of the central through hole serves as a first riveting end. The rivet (2) passes through the central through hole, and the end of the rivet (2) near the first riveting end serves as a second abutment end, and the end of the rivet (2) away from the first riveting end serves as a second riveting end. The first riveting end forms a first riveting end face after riveting. The second abutment end abuts against the first riveting end face, and the second riveting end is riveted to the first abutment end to form a second riveting end face.

2. The double-riveted structure according to claim 1, characterized in that: The pole post (1) includes a pole post base plate (11) and a pole post body (12). The pole post body (12) is perpendicular to the pole post base plate (11). The pole post body (12) has a first assembly section (121) and a first riveting section (122). The first assembly section (121) is provided with a first through hole (1211), and the first riveting section (122) is provided with a second through hole (1221). The width of the second through hole (1221) is greater than the width of the first through hole (1211). The pole post base plate (11) is provided with a third through hole (111). The third through hole (111), the first through hole (1211), and the second through hole (1221) are connected to form a central through hole. The pole post base plate (11) serves as the first abutment end. The first riveting section (122) serves as the first riveting end.

3. The double-riveted structure according to claim 2, characterized in that: The end face of the pole base plate (11) away from the pole body (12) is provided with a riveting groove (112), and the second riveting end face is located in the second riveting groove.

4. The double-riveted structure according to claim 1, 2, or 3, characterized in that: The rivet (2) includes a rivet head (21) and a rivet shank (22). The rivet shank (22) is vertically disposed on the rivet head (21), and the rivet head (21) serves as the second abutment end. The end of the rivet shank (22) away from the rivet head (21) is provided with a rivet hole (221). The part of the rivet shank (22) where the rivet hole is located is the rivet tail (23), and the rivet tail (23) serves as the second rivet end. The remaining part of the rivet shank (22) serves as the second assembly section (222). The second assembly section (222) is inserted into the central through hole.

5. An electrode terminal structure, characterized in that: It includes an upper plastic (3), a cover plate (4), a sealing ring (5), a lower plastic (6), and a double riveting structure. The double riveting structure is any of the double riveting structures described in claims 1-4. The first abutting end of the pole post (1) abuts against the upper plastic (3), and the first riveting end passes through the upper plastic (3), the cover plate (4), and the sealing ring (5) and is riveted to the lower plastic (6). The second abutting end of the rivet (2) abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end.

6. The electrode terminal structure according to claim 5, characterized in that: The first abutting end of the pole post (1) abuts against the lower plastic (6), and the first riveting end passes through the lower plastic (6), the sealing ring (5) and the cover plate (4) and is riveted to the upper plastic (3); the second abutting end of the rivet (2) abuts against the first riveting end face, and the second riveting end passes through the central through hole and is riveted to the first abutting end.

7. The electrode terminal structure according to claim 5 or 6, characterized in that: The cover plate (4) is provided with explosion-proof markings (41) and through holes (42). The through holes (42) are located at the center of the cover plate and serve as the passage for the pole post (1). The explosion-proof markings (41) are arranged around the through holes.

8. The electrode terminal structure according to claim 7, characterized in that: An injection hole (43) is provided on the cover plate (4).

9. An integrated top cover, characterized in that: Includes the electrode terminal structure and current collector (7) as described in any of claims 5-8, wherein the current collector (7) is welded to the first riveting end face or the first abutting end of the pole post.

10. A cylindrical battery, comprising a current collector (7), a casing (8), and a cell (9), characterized in that: The battery cell (9) is disposed inside the housing (8), and the housing (8) has at least one end welded with the electrode terminal structure as described in any one of claims 5-8, and the current collector (7) is welded to the first riveting end face or the first abutting end of the pole.

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