Cylindrical battery

Abstract

The invention relates to the technical field of batteries, in particular to a cylindrical battery, which comprises: a shell; a groove is formed in one side, facing the interior of the shell, of the pole; a flanging part is formed on the side wall of the groove and extends towards the side wall direction of the inner wall adjacent to one side of the shell where the through hole is located so as to fix the pole and the shell; the flow collecting disc is provided with a protrusion, the protrusion is embedded into the groove, and the protrusion and the groove are connected through welding; the side wall of the groove is connected with the flanging part through a first arc-shaped transition part, and the arc radius of the first arc-shaped transition part ranges from 0.2 mm to 2 mm; and a gap is formed between the bulge and the fillet structure of the first arc-shaped transition part. Therefore, the collector plate and the pole are convenient to assemble, and the pole or the collector plate is prevented from being damaged. And the gap can accommodate the assembly tolerance caused by the process.

Description

[0001] This application is a divisional application of the invention patent application with publication number CN202411449880.0. The application date of the original application is: 2024.10.17; the application number is: 202411449880.0; the name of the invention is: "Cylindrical Battery". Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a cylindrical battery. Background Art

[0003] At present, a riveting process is usually used to rivet and fix the flange of the pole to the shell of the cylindrical battery. However, due to the large error of the riveting process, the structure of the pole is easily not completely symmetrical, resulting in asymmetric grooves on the pole.

[0004] Because the groove on the pole is used to assemble with the collector plate, and the collector plate is provided with a corresponding protrusion, when welding and fixing, the protrusion of the collector plate needs to be matched with the groove of the pole before welding. Due to the asymmetry of the groove notch, there is a large assembly error, which makes it difficult for technicians to assemble, and it is easy to damage the pole or collector plate during matching. In addition, it will cause the pole and the collector plate to have a cold weld during welding. Summary of the invention

[0005] In view of this, the present invention provides a cylindrical battery to solve the problem of assembly error between the protrusion of the current collecting plate and the groove of the pole.

[0006] In a first aspect, the present invention provides a cylindrical battery, the cylindrical battery comprising:

[0007] case;

[0008] A through hole is provided on a side wall of the housing;

[0009] A pole partially passes through the through hole; the pole is provided with a groove on a side facing the inside of the shell; and a flange portion is formed on a side wall of the groove, and the flange portion extends toward a side wall adjacent to a side of the shell where the through hole is located, so as to fix the pole and the shell;

[0010] The collecting plate is provided with a protrusion, the protrusion is embedded in the groove, and the protrusion and the groove are connected by welding;

[0011] The side wall of the groove is connected to the flange portion via a first arc-shaped transition portion, the arc radius of the first arc-shaped transition portion is in a range of 0.2 mm to 2 mm; and a gap is provided between the protrusion and the first arc-shaped transition portion.

[0012] Beneficial effects: The embodiment of the present invention provides a first arc-shaped transition portion on the side of the flange portion close to the collector plate, thereby facilitating the assembly of the collector plate and the pole and avoiding damage to the pole or the collector plate during the assembly process. In addition, a gap is provided between the protrusion and the first arc-shaped transition portion to accommodate assembly tolerances caused by the process. At the same time, after the collector plate and the pole are fully assembled, cold welding can be avoided during the welding process. Furthermore, limiting the angle of the first arc-shaped transition portion within a certain range can facilitate the assembly of the collector plate and the pole. If the first arc-shaped transition portion is too small, it will not facilitate assembly. If the first arc-shaped transition portion is too large, the flange portion will be more difficult to form, and it is easy for the flange position of the flange portion to crack due to excessive stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 is a cross-sectional view of a pole and a current collecting plate of a cylindrical battery in an embodiment of the present invention;

[0015] Figure 2 for Figure 1 A magnified view of part C;

[0016] Figure 3 for Figure 2 Schematic diagram of the second arc-shaped transition portion and the first arc-shaped transition portion.

[0017] Description of reference numerals:

[0018] 1. Pole; 11. Groove; 111. First step; 112. Second step; 12. Flanged portion; 13. Annular groove; 14. First arc-shaped transition portion; 2. Collector plate; 21. Protrusion; 22. Second arc-shaped transition portion; 23. Welding portion; 3. Cover plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal communication of two components, it can be a wireless connection, or it can be a wired connection. For ordinary workers in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] At present, the riveting process is usually used to rivet the flange of the pole and the shell of the cylindrical battery. However, due to the large error of the riveting process, it is easy for the structure of the pole to be not completely symmetrical, resulting in asymmetric grooves on the pole. Because the groove on the pole is used to assemble with the collector plate, and the collector plate is correspondingly provided with a protrusion. When welding and fixing, it is necessary to match the protrusion of the collector plate with the groove of the pole before welding. Due to the asymmetry of the groove notch, there is a large assembly error, which makes it impossible for the protrusion to match the groove quickly, which is inconvenient for technicians to assemble, and it is easy to damage the pole or collector plate during matching. In addition, it will also cause cold welding between the pole and the collector plate during welding.

[0024] In view of this, the present invention provides a cylindrical battery to solve the problem of assembly error between the protrusion of the current collecting plate and the groove of the pole.

[0025] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0026] According to an embodiment of the present invention, on one hand, a cylindrical battery is provided, the cylindrical battery comprising a shell, a pole 1 and a current collecting plate 2 .

[0027] Specifically, in the embodiment of the present invention, the shell is a cylindrical structure, and the interior of the shell is used to place the pole group. In addition, in this embodiment, the shell can be set in a separate body or in an integrated body. When the shell is set in a separate body, the shell includes a cover plate 3 and a shell connected to the cover plate 3. When the shell is set in an integrated body, the cover plate 3 and the shell are in an integrated structure.

[0028] Furthermore, in an embodiment of the present invention, a through hole is provided on a side wall of the housing. Figure 1 As shown, the pole 1 partially passes through the through hole. The pole 1 is provided with a groove 11 on the side facing the inside of the shell, and the side wall of the groove 11 is formed with a flange 12, and the flange 12 extends toward the side wall adjacent to the side of the shell where the through hole is located to fix the pole 1 and the shell. In the embodiment of the present invention, the flange 12 is integrated with the groove 11 and is formed by riveting.

[0029] Of course, this embodiment is only an example to illustrate the forming of the flange portion 12, but it is not limited to this. Those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0030] Further, in an embodiment of the present invention, if Figure 2 As shown, the collecting plate 2 is provided with a protrusion 21, and the protrusion 21 is embedded in the groove 11, and the matching portion of the protrusion 21 and the groove 11 is connected by welding.

[0031] Further, in the embodiment of the present invention, the side wall of the groove 11 is connected to the flange portion 12 via a first arc-shaped transition portion 14, the arc radius of the first arc-shaped transition portion 14 ranges from 0.2 mm to 2 mm, and the specific arc radius of the first arc-shaped transition portion 14 can be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, and the first arc-shaped transition portion 14 is bent in a direction away from the current collecting 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 greater than the radius of the protrusion 21, so that the protrusion 21 is easily embedded in the groove 11.

[0032] In this way, the embodiment of the present invention provides a first arc-shaped transition portion 14 in the connection area between the flange portion 12 and the groove 11, which facilitates the assembly of the collector plate 2 and the pole 1, and avoids damaging the pole 1 or the collector plate 2 during the assembly process. In addition, a gap is provided between the protrusion 21 and the first arc-shaped transition portion 14, which can accommodate the assembly tolerance caused by the process. At the same time, after the collector plate 2 and the pole 1 are fully assembled, the situation of cold welding during the welding process can be avoided. Further, limiting the angle of the first arc-shaped transition portion 14 within a certain range can facilitate the assembly of the collector plate 2 and the pole 1. If the first arc-shaped transition portion 14 is too small, it will not be easy to assemble. If the first arc-shaped transition portion 14 is too large, the flange portion 12 is more difficult to form during the molding process, and it is easy to cause the flange position of the flange portion 12 to crack due to excessive stress concentration. Moreover, by accurately controlling the contact area and welding quality of the protrusion 21 and the groove 11, the current transmission path can be optimized, the internal resistance can be reduced, and the charging and discharging efficiency and overall electrical performance of the battery can be improved.

[0033] Further, in an optional embodiment, as Figure 2 As shown, the collecting plate 2 includes a plate body and the protrusion 21 .

[0034] Specifically, in the embodiment of the present invention, the protrusion 21 is provided on the disc body, and the protrusion 21 is connected to the disc body through a second arc-shaped transition portion 22. The second arc-shaped transition portion 22 is an arc-shaped structure, and the second arc-shaped transition portion 22 is bent toward the direction close to the first arc-shaped transition portion 14. In the radial direction of the groove 11, the radius of the disc body is greater 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.

[0035] In an actual product, after installation, the second arc-shaped transition portion 22 is exactly disposed adjacent to the first arc-shaped transition portion 14 , and there is a gap between the two.

[0036] Further, a second arc-shaped transition portion 22 is provided on the circumference of 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 tab.

[0037] In this embodiment, as long as there is a gap between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14, it is convenient for the protrusion 21 to be embedded in the groove 11. Those skilled in the art can adjust the size of the gap according to actual conditions, and this embodiment does not limit the value of the gap. The gap can also avoid damage to the pole 1 or the collector plate 2 during the assembly process. In addition, a gap is provided between the second arc-shaped transition portion 22 and the first arc-shaped transition portion 14 to accommodate the assembly tolerance caused by the process. At the same time, after the collector plate 2 and the pole 1 are fully assembled, the occurrence of cold welding during the welding process can be avoided. In addition, the provision of the second arc-shaped transition portion 22 can buffer external stress to a certain extent, avoid direct transmission to the welding area, reduce welding cracks caused by external force or battery expansion, and protect the structural integrity of the battery.

[0038] Further, in an optional embodiment, as Figure 2 The arc radius of the second arc-shaped transition portion 22 is shown in the range of 0.2mm to 2mm. Specifically, the arc radius of the second arc-shaped transition portion can be 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, so as to facilitate the assembly of the pole 1 and the collecting plate 2, and can also reduce the influence of the thermal effect generated during welding on the performance of the battery material, and maintain the thermal stability and electrical performance of the internal structure of the battery.

[0039] Further, in an optional embodiment, as Figure 2 As shown, the arc radius of the second arc-shaped transition portion 22 is greater than the arc radius of the first arc-shaped transition portion 14. In this embodiment, the arc radius of the second arc-shaped transition portion 22 is greater than the arc radius of the first arc-shaped transition portion 14, which can reduce the interference between the second arc-shaped transition portion 22 of the current collecting plate 2 and the first arc-shaped transition portion 14 of the pole 1 during the installation of the current collecting plate 2, thereby improving the welding yield of the current collecting plate 2 and the pole 1. Furthermore, the second arc-shaped transition portion 22 can provide additional mechanical support for the second arc-shaped transition portion 22, especially when the battery is subjected to external pressure or internal air pressure changes, this structure can better disperse stress, reduce local deformation or damage, and improve the stability and durability of the overall structure.

[0040] Further, in an optional embodiment, the arc radius of the second arc-shaped transition portion 22 is A, the arc radius of the first arc-shaped transition portion 14 is B, and A and B satisfy the following relationship:

[0041] 1<A / B≤2.

[0042] In the embodiment of the present invention, the angle of the second arc-shaped transition portion 22 and the angle of the first arc-shaped transition portion 14 are limited to ensure 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. If 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 too small, the collector plate 2 and the pole 1 cannot be in good contact, resulting in a cold weld. If 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 too large, the angle of the second arc-shaped transition portion 22 is 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. The overall volume of the collector plate 2 needs to be increased, 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 is possible to prevent cold welding and prevent the second arc-shaped transition portion 22 from breaking during the molding process, and to a certain extent ensure the normal use of the battery.

[0043] Further, in an optional embodiment, the second arc-shaped transition portion 22 and the protrusion 21 are an integral structure. In the embodiment of the present invention, the second arc-shaped transition portion 22 and the protrusion 21 are arranged as an integral structure. Compared with the separate arrangement and then welding the second arc-shaped transition portion 22 and the protrusion 21, the integral structure has no seams or welding points, has good overall continuity, can evenly distribute the force, improves the strength and rigidity of the product, and reduces the risk of breakage. In addition, in large-scale production, the integral structure reduces the assembly steps, reduces the labor cost and production cycle, and can significantly save costs in the long term.

[0044] Further, in an optional embodiment, the side wall of the groove 11 is provided with a step structure, and the step structure is provided with a first step 111 and a second step 112 in sequence from far to near in 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.

[0045] Further, in an optional implementation, a distance M is provided between the step structure and the protrusion 21 .

[0046] Further, in an optional implementation, the spacing M is between 0.1 mm and 3 mm, and the preferred range of the arc radius of the second arc-shaped transition portion 22 is between 0.2 mm and 1.2 mm.

[0047] In the embodiment of the present invention, the larger the distance M is, the smaller the influence of the first arc-shaped transition portion 14 on the installation of the collecting plate 2 is, so the arc radius of the first arc-shaped transition portion 14 can be appropriately smaller.

[0048] Further, in an optional embodiment, the thickness of the collecting plate 2 is D, and D is between 0.1 mm and 2 mm.

[0049] Further, in an optional embodiment, when the thickness D of the collector plate 2 is between 0.1 mm and 1 mm, the arc radius of the second arc-shaped transition portion 22 is in the range of 0.2 mm to 1.5 mm. In this way, the thickness of the collector plate 2 can be appropriately reduced, and the arc radius of the second arc-shaped transition portion 22 can be made larger, so the arc radius of the first arc-shaped transition portion 14 can be smaller, thereby ensuring the structural strength of the pole 1 at the flange portion 12.

[0050] In this embodiment, an annular groove 13 is also provided on the step structure, which can ensure stable and precise positioning between the protrusion 21 of the collector plate 2 and the groove 11 of the pole 1 during welding, thereby improving the reliability and stability of welding and reducing welding defects. In addition, the step structure helps to form a tighter seal in the welding area, prevent electrolyte leakage, improve the sealing of the battery, extend the battery life and enhance safety. Furthermore, the step structure simplifies the alignment process of the collector plate 2 and the pole 1, facilitates automated assembly, and provides a clearer disassembly boundary when the collector plate 2 needs to be repaired or replaced, reducing the difficulty of operation.

[0051] Further, in an optional embodiment, as Figure 2 As shown, the thickness of the flange portion 12 gradually decreases in a direction away from the protrusion 21 .

[0052] In the embodiment of the present invention, the thickness of the flange portion 12 gradually decreases to better adapt to the changes in internal pressure during the use of the battery, especially when the volume changes due to the charge and discharge cycle. The gradual thickness can distribute the stress unevenly, reduce local stress concentration, and thus reduce the risk of shell rupture or deformation. Furthermore, the flange portion 12 with a gradually decreasing thickness helps to form a more uniform heat-affected zone in the welding area, which is beneficial to the effective conduction of heat and the improvement of welding quality, ensuring that the welding connection between the protrusion 21 and the groove 11 is more reliable and stable.

[0053] It should be noted that the gradual thickness design can further make it easier for the protrusion 21 of the collecting plate 2 to be embedded in the groove 11, thereby simplifying the assembly process and reducing the risk of damage during the assembly process.

[0054] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cylindrical battery, characterized in that: include: case; A through hole is provided on a side wall of the housing; A pole (1) partially passes through the through hole; the pole (1) is provided with a groove (11) on a side facing the inside of the shell; and a flange portion (12) is formed on a side wall of the groove (11), and the flange portion (12) extends toward a side wall adjacent to a side of the shell where the through hole is located, so as to fix the pole (1) and the shell; The current collecting 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 side wall of the groove (11) is connected to the flange portion (12) via a first arc-shaped transition portion (14), the arc radius of the first arc-shaped transition portion (14) is in the range of 0.2 mm to 2 mm, and a gap is provided between the protrusion (21) and the first arc-shaped transition portion (14); The side wall of the groove (11) is provided with a step structure, wherein the step structure is provided with a first step (111) and a second step (112) in sequence from far to near along a 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).

2. The cylindrical battery according to claim 1, characterized in that: The collecting plate (2) comprises: Plate body; The protrusion (21) is arranged on the disc body; the protrusion (21) and the disc body are connected via a second arc-shaped transition portion (22); and in the radial direction of the groove (11), the radius of the disc body is greater than the radius of the protrusion (21); The second arc-shaped transition portion (22) is arranged opposite to the first arc-shaped transition portion (14), and a gap is arranged 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 arc radius of the second arc-shaped transition portion (22) ranges from 0.2 mm to 2 mm.

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

5. The cylindrical battery according to claim 4, characterized in that: The arc radius of the second arc-shaped transition portion (22) is A, and the arc radius 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: A spacing M is provided between the step structure and the protrusion (21).

8. The cylindrical battery according to claim 7, 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.

9. The cylindrical battery according to any one of claims 2 to 5, characterized in that: The thickness of the current collecting plate (2) is D, and D is between 0.1 mm and 2 mm; when the thickness D of the current collecting 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.

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

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