Cylindrical battery

Abstract

The present application relates to the technical field of batteries, and particularly relates to a cylindrical battery. The cylindrical battery comprises: a housing; a through hole and a post, the side of the post facing the inside of the housing being provided with a recess, a side wall of the recess being provided with a flange portion, and the flange portion extending toward the direction of the inner side wall adjacent to the side of the housing where the through hole is located, so as to fix the post and the housing; and a current collector disc, which is provided with a protrusion, the protrusion being embedded in the recess, and the protrusion being connected to the recess by means of welding. The side wall of the recess is connected to the flange portion by means of a first arc-shaped transition portion, the arc radius of the first arc-shaped transition portion ranging from 0.2 mm to 2 mm; and a clearance is provided between the protrusion and a rounded corner structure of the first arc-shaped transition portion. The present application facilitates assembly of the current collector disc and the post and prevents the post or the current collector disc from being damaged. In addition, the clearance can accommodate assembly tolerances caused by processes.

Description

Cylindrical battery

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411449880.0, filed on October 17, 2024, entitled “Cylindrical Battery”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a cylindrical battery. Background Technology

[0004] Currently, riveting is commonly used to fix the flange of the terminal post to the casing of the cylindrical battery. However, due to the large error in the riveting process, the structure of the terminal post is not completely symmetrical, resulting in asymmetrical grooves on the terminal post.

[0005] Because the grooves on the terminal block are for assembly with the current collector, and the current collector has corresponding protrusions, during welding, the protrusions of the current collector must be aligned with the grooves on the terminal block before welding. Due to the asymmetry of the groove openings, there is a significant assembly error, causing the protrusions to not quickly match the grooves. This makes assembly inconvenient for technicians and can easily damage the terminal block or current collector during assembly. Furthermore, it can also lead to incomplete welds between the terminal block and the current collector. Summary of the Invention

[0006] In view of this, this application provides a cylindrical battery to solve the problem of assembly error between the protrusion of the current collector and the groove of the terminal post.

[0007] In a first aspect, this application provides a cylindrical battery, the cylindrical battery comprising:

[0008] case;

[0009] A through hole is provided on one side wall of the housing;

[0010] The electrode post partially passes through the through hole; the electrode post has a groove on the side facing the inside of the housing; and the sidewall of the groove has a flange, which extends toward the sidewall adjacent to the sidewall of the housing where the through hole is located, so as to fix the electrode post to the housing;

[0011] The collector plate is provided with a protrusion, which is embedded in the groove, and the protrusion and the groove are connected by welding;

[0012] The sidewall of the groove is connected to the flange by a first arc-shaped transition portion, the radius of which is 0.2mm to 2mm; and a gap is provided between the protrusion and the first arc-shaped transition portion.

[0013] On the other hand, this application provides a battery comprising:

[0014] case;

[0015] A through hole is provided on one side wall of the housing;

[0016] The electrode post partially passes through the through hole; the electrode post has a groove on the side facing the inside of the housing; and the sidewall of the groove has a flange, which extends toward the sidewall adjacent to the sidewall of the housing where the through hole is located, so as to fix the electrode post to the housing;

[0017] The collector plate is provided with a protrusion, which is embedded in the groove, and the protrusion and the groove are connected by welding;

[0018] The sidewall of the groove is connected to the flange by a first arc-shaped transition portion, the arc radius of the first arc-shaped transition portion is in the range of 0.2mm to 2mm, and a gap is provided between the protrusion and the first arc-shaped transition portion.

[0019] Beneficial Effects: This embodiment of the application provides a first arc-shaped transition portion on the side of the flange closest to the collector plate, facilitating the assembly of the collector plate and the electrode post and preventing damage to the electrode post or collector plate during assembly. Furthermore, a gap is provided between the protrusion and the first arc-shaped transition portion to accommodate assembly tolerances introduced by the manufacturing process. Simultaneously, after the collector plate and the electrode post are fully assembled, incomplete welding during the welding process can be avoided. Further, limiting the angle of the first arc-shaped transition portion within a certain range facilitates the assembly of the collector plate and the electrode post. If the first arc-shaped transition portion is too small, it will not facilitate assembly; if it is too large, the flange portion will be difficult to form during the molding process, and the flanged area may crack due to excessive stress concentration. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 is a cross-sectional view of the terminals and current collector of the cylindrical battery in an embodiment of this application;

[0022] Figure 2 is an enlarged view of part C of Figure 1;

[0023] Figure 3 is a schematic diagram of the second arc-shaped transition section and the first arc-shaped transition section in Figure 2.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Pole post; 11. Groove; 111. First step; 112. Second step; 12. Flanged part; 13. Annular groove; 14. First arc-shaped transition part; 2. Collector plate; 21. Protrusion; 22. Second arc-shaped transition part; 23. Welded part; 3. Cover plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal connection of two components; and they can refer to wireless connections or wired connections. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0030] Currently, riveting is commonly used to fix the flanged end of the terminal block to the cylindrical battery casing. However, due to the large error margin in riveting, the terminal block structure is often not perfectly symmetrical, resulting in asymmetrical grooves on the terminal block. Since the grooves on the terminal block are used to assemble with the current collector, and the current collector has corresponding protrusions, during welding, the protrusions of the current collector must be aligned with the grooves on the terminal block before welding. Due to the asymmetry of the grooves, there is a significant assembly error, making it difficult for the protrusions to quickly match the grooves, hindering assembly by technicians, and easily damaging the terminal block or current collector during assembly. Furthermore, it can also cause incomplete welds when welding the terminal block and current collector.

[0031] In view of this, this application provides a cylindrical battery to solve the problem of assembly error between the protrusion of the current collector and the groove of the terminal post.

[0032] The embodiments of this application are described below with reference to Figures 1 to 3.

[0033] According to an embodiment of this application, a cylindrical battery is provided, which includes a casing, terminals 1, and current collector 2.

[0034] Specifically, in this embodiment, the housing has a cylindrical structure, and the interior of the housing is used to house the electrode assembly. Furthermore, in this embodiment, the housing can be either separate or integrally formed. When the housing is separate, it includes a cover plate 3 and an outer shell connected to the cover plate 3. When the housing is integrally formed, the cover plate 3 and the outer shell are of one piece.

[0035] Furthermore, in this embodiment, a through hole is provided on one side wall of the housing. As shown in FIG1, the pole post 1 partially passes through the through hole. The pole post 1 has a groove 11 on the side facing the interior of the housing, and the side wall of the groove 11 forms a flange 12. The flange 12 extends toward the side wall adjacent to the side of the housing where the through hole is located to fix the pole post 1 to the housing. In this embodiment, the flange 12 and the groove 11 are integral and are formed by riveting.

[0036] Of course, this embodiment is merely an example of the forming of the flange 12, but it does not limit the scope of the invention. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0037] Furthermore, in this embodiment of the application, as shown in FIG2, the collector plate 2 is provided with a protrusion 21, the protrusion 21 is embedded in the groove 11, and the mating part of the protrusion 21 and the groove 11 is connected by welding.

[0038] Further, in this embodiment, the sidewall of the groove 11 and the flange 12 are connected by a first arc-shaped transition portion 14. The arc radius of the first arc-shaped transition portion 14 ranges from 0.2mm to 2mm, specifically 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, and 2.0mm. The first arc-shaped transition portion 14 bends away from the collector plate 2. A gap is provided between the protrusion 21 and the first arc-shaped transition portion 14, that is, the opening radius of the groove 11 is larger than the radius of the protrusion 21, thereby facilitating the insertion of the protrusion 21 into the groove 11.

[0039] With this configuration, the embodiment of this application provides a first arc-shaped transition portion 14 at the connection area between the flange 12 and the groove 11, facilitating the assembly of the current collector 2 and the terminal post 1 and preventing damage to the terminal post 1 or the current collector 2 during assembly. Furthermore, a gap is provided between the protrusion 21 and the first arc-shaped transition portion 14 to accommodate assembly tolerances caused by the manufacturing process. Simultaneously, after the current collector 2 and the terminal post 1 are fully assembled, incomplete welding during the welding process can be avoided. Further, limiting the angle of the first arc-shaped transition portion 14 within a certain range facilitates the assembly of the current collector 2 and the terminal post 1. If the first arc-shaped transition portion 14 is too small, it will not facilitate assembly; if it is too large, the flange 12 will be difficult to form during the molding process, and the flange position of the flange 12 may crack due to excessive stress concentration. Moreover, by precisely controlling the contact area and welding quality between the protrusion 21 and the groove 11, the current transmission path can be optimized, internal resistance reduced, and the charging and discharging efficiency and overall electrical performance of the battery improved.

[0040] Furthermore, in an optional embodiment, as shown in FIG2, the collector disk 2 includes a disk body and the protrusion 21.

[0041] Specifically, in this embodiment, the protrusion 21 is disposed on the disk body, and the protrusion 21 is connected to the disk body via a second arc-shaped transition portion 22. The second arc-shaped transition portion 22 has an arc-shaped structure and bends towards the first arc-shaped transition portion 14. Furthermore, in the radial direction of the groove 11, the radius of the disk body is larger than the radius of the protrusion 21. The second arc-shaped transition portion 22 corresponds to the first arc-shaped transition portion 14, and a gap is provided between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14.

[0042] In the actual product, after installation, the second arc-shaped transition portion 22 is positioned adjacent to the first arc-shaped transition portion 14, and there is a gap between the two.

[0043] Furthermore, a second arc-shaped transition portion 22 is circumferentially provided on the edge of the protrusion 21. The second arc-shaped transition portion 22 corresponds to the first arc-shaped transition portion 14, and a gap is provided between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14. At the same time, a welding portion 23 is provided on the outer edge of the second arc-shaped transition portion 22. The welding portion 23 extends in a direction away from the second arc-shaped transition portion 22, and the welding portion 23 is welded to the electrode tab.

[0044] In this embodiment, as long as a gap exists between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 to facilitate the insertion of the protrusion 21 into the groove 11, it is acceptable. Those skilled in the art can adjust the size of the gap according to actual conditions; this embodiment does not limit the value of the gap. The gap also prevents damage to the terminal post 1 or the current collector 2 during assembly. Furthermore, the gap between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 can accommodate assembly tolerances caused by the manufacturing process. Simultaneously, after the current collector 2 and the terminal post 1 are fully assembled, it can prevent incomplete welding during the welding process. Moreover, the second arc-shaped transition portion 22 can buffer external stress to a certain extent, preventing it from being directly transmitted to the welding area, reducing welding cracks caused by external forces or battery expansion, and protecting the structural integrity of the battery.

[0045] Furthermore, in an optional embodiment, as shown in FIG2, the arc radius of the second arc transition portion 22 is between 0.2mm and 2mm. Specifically, the arc radius of the second arc transition portion can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, or 2.0mm, thereby facilitating the assembly of the electrode post 1 and the current collector 2, and also reducing the impact of the heat effect generated during welding on the performance of the battery materials, maintaining the thermal stability and electrical performance of the internal structure of the battery.

[0046] Further, in an optional embodiment, as shown in FIG2, the radius of the arc of the second arc-shaped transition portion 22 is larger than the radius of the arc of the first arc-shaped transition portion 14. In this embodiment, the larger radius of the arc of the second arc-shaped transition portion 22 compared to the first arc-shaped transition portion 14 can reduce interference between the second arc-shaped transition portion 22 of the current collector 2 and the first arc-shaped transition portion 14 of the electrode post 1 during the installation of the current collector 2, thereby improving the welding yield of the current collector 2 and the electrode post 1. Furthermore, the second arc-shaped transition portion 22 can provide additional mechanical support, especially when the battery is subjected to external pressure or internal pressure changes. This structure can better disperse stress, reduce local deformation or damage, and improve the stability and durability of the overall structure.

[0047] Furthermore, in an optional embodiment, the radius of the arc of the second arc-shaped transition portion 22 is A, and the radius of the arc of the first arc-shaped transition portion 14 is B, wherein A and B satisfy the following relationship:

[0048] 1 < A / B ≤ 2.

[0049] In this embodiment, by limiting the angle of the second arc-shaped transition portion 22 and the angle of the first arc-shaped transition portion 14, the difference between the angles of the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 is ensured to be within a certain range. If the difference between the angles of the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 is too small, the current collector 2 and the electrode post 1 will not make good contact, resulting in a cold solder joint. If the difference between the angles of the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 is too large, the angle of the second arc-shaped transition portion 22 will be too large. In order to ensure that the second arc-shaped transition portion 22 can be bent normally, it is also necessary to ensure that the second arc-shaped transition portion 22 will not break due to excessive stress during the bending process. This requires increasing the overall volume of the current collector 2, which will affect the internal space of the battery and reduce the energy density of the battery. By ensuring that the difference between the angle of the second arc-shaped transition portion 22 and the angle of the first arc-shaped transition portion 14 is within a certain range, it can prevent cold solder joints and also prevent the second arc-shaped transition portion 22 from breaking during the forming process. To a certain extent, it can also ensure the normal use of the battery.

[0050] Furthermore, in an optional embodiment, the second arc-shaped transition portion 22 and the protrusion 21 are an integral structure. By making the second arc-shaped transition portion 22 and the protrusion 21 an integral structure, compared to separate structures that are then welded together, the integral structure has no seams or weld points, resulting in good overall continuity, even distribution of stress, improved product strength and rigidity, and reduced risk of breakage. Moreover, in mass production, the integral structure reduces assembly steps, lowers labor costs and production cycles, and significantly saves costs in the long run.

[0051] Furthermore, in an optional embodiment, the sidewall of the groove 11 is provided with a stepped structure, wherein the stepped structure is provided with a first step 111 and a second step 112 in sequence from far to near along the direction close to the collecting plate 2. And along the radial direction of the groove 11, the radial width of the second step 112 is greater than the radial width of the first step 111.

[0052] Furthermore, in an optional embodiment, a distance M is provided between the stepped structure and the protrusion 21.

[0053] Furthermore, in an optional embodiment, the spacing M is between 0.1 mm and 3 mm, and the arc radius of the second arc transition portion 22 is preferably between 0.2 mm and 1.2 mm.

[0054] In this embodiment, the larger the spacing M, the smaller the impact of the first arc transition portion 14 on the installation of the collector plate 2. Therefore, the arc radius of the first arc transition portion 14 can be appropriately smaller.

[0055] Furthermore, in an optional embodiment, the thickness of the collector plate 2 is D, where D is between 0.1 mm and 2 mm.

[0056] Furthermore, in an optional embodiment, when the thickness D of the collector plate 2 is between 0.1 mm and 1 mm, the radius of the arc of the second arc-shaped transition portion 22 is between 0.2 mm and 1.5 mm. This configuration allows for a suitable reduction in the thickness of the collector plate 2, while enabling a larger radius of the arc of the second arc-shaped transition portion 22. Consequently, the radius of the arc of the first arc-shaped transition portion 14 can be smaller, thus ensuring the structural strength of the pole post 1 at the flange portion 12.

[0057] In this embodiment, the stepped structure is further provided with an annular groove 13. The annular groove 13 ensures a stable and precise positioning between the protrusion 21 of the current collector 2 and the groove 11 of the electrode post 1 during the welding process, improving the reliability and stability of the welding and reducing welding defects. Furthermore, the stepped structure helps to form a tighter seal in the welding area, preventing electrolyte leakage, improving battery sealing, extending battery life, and enhancing safety. Further, the stepped structure simplifies the alignment process between the current collector 2 and the electrode post 1, facilitating automated assembly, and provides a clearer disassembly boundary when the current collector 2 needs repair or replacement, reducing operational difficulty.

[0058] Furthermore, in an alternative embodiment, as shown in FIG2, the thickness of the flange 12 gradually decreases along the direction away from the protrusion 21.

[0059] In this embodiment, the gradually decreasing thickness of the flange 12 better adapts to changes in internal pressure during battery use, especially during volume changes caused by charge-discharge cycles. The gradual thickness can distribute stress non-uniformly, reducing local stress concentration and thus lowering the risk of casing cracking or deformation. Furthermore, the gradually decreasing thickness of the flange 12 helps to form a more uniform heat-affected zone in the welding area, which is beneficial for effective heat conduction and improved welding quality, ensuring a more reliable and stable weld connection between the protrusion 21 and the groove 11.

[0060] It should be noted that the gradient thickness design can further make it easier for the protrusion 21 of the collector plate 2 to be embedded in the groove 11, simplifying the assembly process and reducing the risk of damage during assembly.

[0061] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A cylindrical battery, characterized in that, include: case; A through hole is provided on one side wall of the housing; The pole (1) partially passes through the through hole; the pole (1) has a groove (11) on the side facing the inside of the housing; and the side wall of the groove (11) has a flange (12) which extends toward the side wall adjacent to the side of the housing where the through hole is located, so as to fix the pole (1) to the housing. The collector plate (2) is provided with a protrusion (21), the protrusion (21) is embedded in the groove (11), and the protrusion (21) and the groove (11) are connected by welding; The sidewall of the groove (11) is connected to the flange (12) by a first arc-shaped transition portion (14), the arc radius of the first arc-shaped transition portion (14) is in the range of 0.2mm to 2mm, and a gap is provided between the protrusion (21) and the first arc-shaped transition portion (14).

2. The cylindrical battery according to claim 1, characterized in that, The collector disk (2) includes: Disk body; The protrusion (21) is disposed on the disk body; the protrusion (21) and the disk body are connected by a second arc-shaped transition portion (22); and in the radial direction of the groove (11), the radius of the disk body is greater than the radius of the protrusion (21); The second arc-shaped transition portion (22) is disposed opposite to the first arc-shaped transition portion (14), and a gap is provided between the second arc-shaped transition portion (22) and the first arc-shaped transition portion (14).

3. The cylindrical battery according to claim 2, characterized in that, The radius of the second arc-shaped transition portion (22) is between 0.2 mm and 2 mm.

4. The cylindrical battery according to claim 3, characterized in that, The arc radius of the second arc transition portion (22) is greater than that of the first arc transition portion (14).

5. The cylindrical battery according to claim 4, characterized in that, The radius of the arc of the second arc-shaped transition portion (22) is A, and the radius of the arc of the first arc-shaped transition portion (14) is B. A and B satisfy the following relationship: 1 < A / B ≤ 2.

6. The cylindrical battery according to any one of claims 2 to 5, characterized in that, The second arc-shaped transition portion (22) and the protrusion (21) are an integral structure.

7. The cylindrical battery according to any one of claims 2 to 5, characterized in that, The sidewall of the groove (11) is provided with a stepped structure. The stepped structure is provided with a first step (111) and a second step (112) in sequence from far to near along the direction close to the collecting plate (2). And along the radial direction of the groove (11), the radial width of the second step (112) is greater than the radial width of the first step (111).

8. The cylindrical battery according to claim 7, characterized in that, A distance M is provided between the stepped structure and the protrusion (21).

9. The cylindrical battery according to claim 8, characterized in that, The spacing M is between 0.1 mm and 3 mm, and the extension range of the second arc-shaped transition portion (22) is between 0.2 mm and 1.2 mm.

10. The cylindrical battery according to any one of claims 3 to 5, characterized in that, The thickness of the collector plate (2) is D, which is between 0.1 mm and 2 mm; when the thickness D of the collector plate (2) is between 0.1 mm and 1 mm, the extension range of the second arc-shaped transition portion (22) is between 0.2 mm and 1.5 mm.

11. The cylindrical battery according to any one of claims 1 to 5, characterized in that, Along the direction away from the protrusion (21), the thickness of the flange (12) gradually decreases.

12. The cylindrical battery according to any one of claims 1 to 11, characterized in that, The housing includes a cover plate (3) and an outer shell connected to the cover plate (3), and the cover plate (3) is provided with a through hole.

13. The cylindrical battery according to claim 12, characterized in that, The cover plate (3) and the outer shell are integrally structured.

14. The cylindrical battery according to claim 1, characterized in that, The radius of the arc of the first arc transition portion (14) is between 0.4 mm and 1.8 mm.

15. The cylindrical battery according to claim 3, characterized in that, The radius of the arc of the second arc transition portion (22) is between 0.4 mm and 1.8 mm.

16. The cylindrical battery according to any one of claims 1 to 15, characterized in that, The opening radius of the groove (11) is greater than the radius of the protrusion (21).

17. A battery, characterized in that, include: case; A through hole is provided on one side wall of the housing; The pole (1) partially passes through the through hole; the pole (1) has a groove (11) on the side facing the inside of the housing; and the side wall of the groove (11) has a flange (12) which extends toward the side wall adjacent to the side of the housing where the through hole is located, so as to fix the pole (1) to the housing. The collector plate (2) is provided with a protrusion (21), the protrusion (21) is embedded in the groove (11), and the protrusion (21) and the groove (11) are connected by welding; The sidewall of the groove (11) is connected to the flange (12) by a first arc-shaped transition portion (14), the arc radius of the first arc-shaped transition portion (14) is in the range of 0.2mm to 2mm, and a gap is provided between the protrusion (21) and the first arc-shaped transition portion (14).

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