Cylindrical battery

Abstract

Cylindrical battery, characterized in that it comprises the following: a case; a through-hole located on a side wall of the housing; a pole column (1) which extends partially through the through-hole; wherein a groove (11) is provided on the side of the pole column (1) facing the interior of the housing; and a flange section (12) is formed on the side wall of the groove (11), wherein the flange section (12) extends in the direction of the side wall which is adjacent to the flange section (12) of the housing in which the through-hole is located, in order to fasten the pole column (1) to the housing; a current collector disk (2) which is provided with a projection (21), wherein the projection (21) is embedded in the groove (11) and the projection (21) and the groove (11) are joined by welding; wherein the side wall of the groove (11) and the flange section (12) are connected by a first arcuate transition section (14), the arc radius of the first arcuate transition section (14) being in the range of 0.2 mm to 2 mm, and a gap is provided between the projection (21) and the first arc-shaped transition section (14), that the side wall of the groove (11) has a stepped structure, wherein the stepped structure along the direction of the current collector disk (2) has a first step (111) and a second step (112) in succession from far to near; and that 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).

Description

Technical area

[0001] The present utility model relates to the technical field of batteries and in particular to a cylindrical battery. Background technology

[0002] Currently, rivets are commonly used to attach the terminal column flange to the cylindrical battery casing. However, due to significant errors in the riveting process, the terminal column's structure can be uneven, resulting in asymmetrical notches.

[0003] Since the notch in the pole column is designed to align with the current collector disc, which has a corresponding protrusion, the protrusion of the current collector disc must be aligned with the notch in the pole column before welding. The asymmetry of the groove opening leads to significant assembly errors and prevents the protrusion from fitting quickly into the groove, making assembly difficult for technicians and potentially damaging the pole column or current collector disc during assembly. Furthermore, defective welds between the pole column and the current collector disc can occur. Contents of the invention

[0004] In view of this, the present utility model provides a cylindrical battery to solve the problem of assembly errors between the projection of the current collector disk and the groove of the pole column.

[0005] In a first aspect, the present utility model provides a cylindrical battery, the cylindrical battery comprising the following: a case; a through-hole located on a side wall of the housing; a pole column which extends partially through the through-hole; wherein a groove is provided on the side of the pole column facing the interior of the housing; and a flange section is formed on the side wall of the groove, wherein the flange section extends in the direction of the side wall which is adjacent to the flange section on the side of the housing in which the through-hole is located, in order to fasten the pole column to the housing; a current collector disk which is provided with a projection, wherein the projection is embedded in the groove and the projection and the groove are joined by welding; wherein the side wall of the groove and the flange section are connected by a first arcuate transition section, wherein the arc radius of the first arcuate transition section is in the range of 0.2 mm to 2 mm and a gap is provided between the projection and the first arcuate transition section.

[0006] Advantageous Effects: The embodiment of the present utility model incorporates a first arcuate transition section on the side of the flange section facing the current collector disk. This facilitates the assembly of the current collector disk and pole column and prevents damage to the pole column or current collector disk during the assembly process. Furthermore, a gap is provided between the projection and the first arcuate transition section to compensate for assembly errors. Once the current collector disk and pole column are fully assembled, this also prevents the formation of defective welds during the welding process. Additionally, limiting the angle of the first arcuate transition section to a specific range can facilitate the assembly of the current collector disk and pole column. If the first arcuate transition section is too small, assembly cannot be facilitated.If the first arc-shaped transition section is too large, the forming of the flange section during the forming process becomes more difficult and there is a risk that the flange section will crack due to excessive stress concentrations at the flange position. Figures

[0007] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the figures necessary for use in the specific embodiments or the description of the prior art are briefly presented below. Obviously, the figures described below represent some embodiments of the present utility model, and general technical personnel in this field can create further figures based on these figures without any creative effort. Figure 1 is a cross-section of a pole column and a current collector disk of the cylindrical battery in an embodiment of the present utility model; Figure 2 is an enlarged view of section C in Figure 1; Figure 3 is a schematic representation of the second transition section and the first arc-shaped transition section in Figure 2. Reference symbols in the figures:

[0008] 1. Pole column; 11. Groove; 111. First stage; 112. Second stage; 12. Flange section; 13. Annular groove; 14. First arcuate transition section; 2. Current collector disc; 21. Projection; 22. Second arcuate transition section; 23. Welded section; 3. Cover plate. Specific embodiments

[0009] To clarify the purpose, technical solution, and advantages of the embodiments of this utility model, the technical solutions in these embodiments are described clearly and completely below in conjunction with the accompanying drawings. It is evident that the described embodiments represent some of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all further embodiments that a person skilled in the art would obtain without inventive activity fall within the scope of protection of this utility model.

[0010] In the description of this utility model, it is to be understood that azimuth or positional relationships relating to the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," etc., are azimuth or positional relationships based on the figures. They are intended to facilitate and simplify the description of this utility model, rather than indicating or implying that the device or component in question must have a specific orientation, be designed, or be operated in a specific orientation. Therefore, they must not be understood as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used only for differentiated description and cannot be understood as indicating a relative meaning.

[0011] It should be noted that in the description of this utility model, the terms "install," "connect," and "link" are to be understood in a broad sense, unless expressly stated otherwise or limited. For example, it may be a permanent connection, a detachable connection, or a connection in one piece; it may be a mechanical connection or an electrical connection; it may be a direct connection, an indirect connection via an intermediate medium, or a connection within the two elements; and it may be a wireless or a wired connection. For general technical personnel in this field, the specific meaning of the above terms in this utility model may be understood according to the specific circumstances.

[0012] Furthermore, the various features described below can be combined in the embodiments of the present utility model, as long as they do not conflict with each other.

[0013] Currently, rivets are commonly used to attach the terminal column flange to the cylindrical battery housing. However, due to significant errors in the riveting process, the terminal column's structure can be uneven, resulting in asymmetrical notches. Since the terminal column notch is designed to align with the current collector disc, which has a corresponding protrusion, the protrusion of the current collector disc must be aligned with the terminal column notch before welding. This asymmetry of the groove opening leads to significant assembly errors and prevents the protrusion from quickly fitting into the groove, making assembly difficult for technicians and potentially damaging the terminal column or current collector disc during assembly. Furthermore, defective welds between the terminal column and the current collector disc can occur.

[0014] In view of this, the present utility model provides a cylindrical battery to solve the problem of assembly errors between the projection of the current collector disk and the groove of the pole column.

[0015] The following are exemplary embodiments of the present utility model with reference to the Fig. 1 to 3 described.

[0016] According to the embodiments of the present utility model, in one aspect a cylindrical battery is provided, wherein the cylindrical battery comprises a housing, a pole column 1 and a current collector disk 2.

[0017] In the embodiment of the present utility model, the housing has a cylindrical structure, and the interior of the housing is designed to accommodate the pole assembly. Furthermore, in this embodiment, the housing can be provided in a separate or integrated configuration. If the housing is separate, it comprises a cover plate 3 and an outer shell connected to the cover plate 3. If the housing is integrated, the cover plate 3 and the outer shell form a single unit.

[0018] Furthermore, in one embodiment of the present utility model, a through-hole is arranged in a side wall of the housing. As in Fig. As shown in Figure 1, the pole column 1 extends partially through the through-hole. A groove 11 is provided on the side of the pole column 1 facing the interior of the housing, and a flange section 12 is formed on the side wall of the groove 11. The flange section 12 extends toward the side wall adjacent to the side of the housing where the through-hole is located, in order to fasten the pole column 1 to the housing. In the embodiment of the present utility model, the flange section 12 and the groove 11 are integrated and formed by rivets.

[0019] Of course, this embodiment is only one example of the shaping of flange section 12 and is not limited to it. Experts in this field can make changes according to the actual circumstances, as long as the same technical effect is achieved.

[0020] Furthermore, in one embodiment of the present utility model, as in Fig. Figure 2 shows a current collector disk 2 provided with a projection 21, wherein the projection 21 is embedded in the groove 11 and the mating point of the projection 21 and that of the groove 11 are connected to each other by welding.

[0021] Furthermore, in one embodiment of the present utility model, the side wall of the groove 11 and the flange section 12 are connected by a first arcuate transition section 14, wherein the arc radius of the first arcuate transition section 14 is in the range of 0.2 mm to 2 mm. In particular, the arc radius of the first arcuate transition section 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 or 2.0 mm, and the first arcuate transition section 14 bends in a direction away from the current collector disk 2. A gap is provided between the projection 21 and the first arc-shaped transition section 14, i.e., the opening radius of the groove 11 is larger than the radius of the projection 21, which facilitates the embedding of the projection 21 in the groove 11.

[0022] With such an arrangement, the present embodiment of the present utility model provides a first arcuate transition section 14 at the connection area between flange section 12 and groove 11, which facilitates the assembly of the current collector disk 2 and the pole column 1 and prevents damage to the pole column 1 or current collector disk 2 during the assembly process. Furthermore, a gap is provided between the projection 21 and the first arcuate transition section 14 to compensate for process-related assembly errors. Once the current collector disk 2 and the pole column 1 are fully assembled, this also prevents the formation of defective welds during the welding process. In addition, limiting the angle of the first arcuate transition section 14 within a specific range can facilitate the assembly of the current collector disk 2 and the pole column 1.If the first arc-shaped transition section 14 is too small, assembly cannot be facilitated. If the first arc-shaped transition section 14 is too large, forming the flange section 12 during the forming process becomes more difficult, and there is a risk that the flange section 12 will crack due to excessive stress concentrations at the flange position. Furthermore, by precisely controlling the contact area and weld quality between the projection 21 and the groove 11, the current transmission path can be optimized, the internal resistance reduced, and the charging and discharging efficiency as well as the overall electrical performance of the battery improved.

[0023] Furthermore, in an optional embodiment, the current collector disk 2 comprises, as shown in Fig. 2 shown, a disk body and the projection 21.

[0024] In particular, in the embodiment of the present utility model, the projection 21 is provided on the disk body, and the projection 21 and the disk body are connected via a second arcuate transition section 22. The second arcuate transition section 22 has an arcuate structure and bends in a direction facing the first arcuate transition section 14. In the radial direction of the groove 11, the radius of the disk body is larger than the radius of the projection 21. The second arcuate transition section 22 corresponds to the first arcuate transition section 14, and a gap is provided between the second arcuate transition section 22 and the first arcuate transition section 14.

[0025] In an actual product, after assembly, the second arc-shaped transition section 22 is positioned exactly next to the first arc-shaped transition section 14, and there is a gap between the two.

[0026] Furthermore, a second arcuate transition section 22 is provided along the circumference of the projection 21. This second arcuate transition section 22 corresponds to the first arcuate transition section 14, and a gap exists between the second arcuate transition section 22 and the first arcuate transition section 14. A weld section 23 is also provided at the outer edge of the second arcuate transition section 22. This weld section 23 extends in a direction away from the second arcuate transition section 22 and is welded to the pole vane.

[0027] In this embodiment, a gap exists between the second arcuate transition section 22 and the first arcuate transition section 14, which facilitates the insertion of the projection 21 into the groove 11. Experts in this field can adjust the gap size according to the actual conditions. In this embodiment, there is no limit to the gap size. This gap also prevents damage to the pole column 1 or the collector plate 2 during assembly. Furthermore, a gap is provided between the second arcuate transition section 22 and the first arcuate transition section 14 to compensate for process-related assembly errors. Once the current collector disk 2 and the pole column 1 are fully assembled, this also prevents the formation of defective welds during the welding process.Furthermore, the arrangement of the second arc-shaped transition section 22 can buffer external loads to a certain degree, avoid direct transmission to the welding area, reduce weld cracks caused by external force or battery expansion, and protect the structural integrity of the battery.

[0028] Furthermore, in an optional embodiment, the arc radius of the second arc-shaped transition section 22 lies as shown in Fig. 2 shown, between 0.2 mm and 2 mm. In particular, the arc radius of the second arc-shaped transition section 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, or 2.0 mm, which facilitates the assembly of the pole column 1 and the current collector disk 2 and can also reduce the effects of the thermal effect generated during welding on the performance of the battery material, thereby maintaining the thermal stability and electrical performance of the battery's internal structure. Furthermore, in an optional embodiment, as shown in Fig. 2 shown, larger than the arc radius of the first arc-shaped transition section 14. In this embodiment, the arc radius of the second arc-shaped transition section 22 is larger than the arc radius of the first arc-shaped transition section 14, which reduces the interference between the second arc-shaped transition section 22 of the current collector disk 2 and the first arc-shaped transition section 14 of the pole column 1 during the assembly of the current collector disk 2, thereby improving the welding efficiency between the current collector disk 2 and the pole column 1.Furthermore, the second arc-shaped transition section 22 can provide additional mechanical support to the second arc-shaped transition section 22, especially when the battery is exposed to external pressure or changes in internal air pressure, this structure can better distribute the stress, reduce local deformations or damage and improve the stability and durability of the overall structure.

[0029] Furthermore, the arc radius of the second arc-shaped transition section 22 is A in an optional embodiment and the arc radius of the first arc-shaped transition section (14) is B, where A and B satisfy the following relationship: 1

[0030] ​In the embodiment of the present utility model, limiting the angle of the second arcuate transition section 22 and the angle of the first arcuate transition section 14 ensures that the difference between the angle of the second arcuate transition section 22 and the angle of the first arcuate transition section 14 lies within a specific range. If the difference between the angle of the second arcuate transition section 22 and the angle of the first arcuate transition section 14 is too small, poor contact between the current collector disk 2 and the pole column 1 may occur, leading to defective welding. If the difference between the angle of the second arcuate transition section 22 and the angle of the first arcuate transition section 14 is too large, the angle of the second arcuate transition section 22 may also be too large.To ensure that the second arcuate transition section 22 can bend properly and does not break due to excessive stress during the bending process, the overall volume of the current collector disk 2 must be increased, which affects the battery's internal space and reduces its energy density. By ensuring that the difference between the angle of the second arcuate transition section 22 and the angle of the first arcuate transition section 14 remains within a certain range, defective welding can be prevented, while simultaneously preventing breakage of the second arcuate transition section 22 during the forming process, thus ensuring, to a certain extent, the normal use of the battery.

[0031] Furthermore, in an optional embodiment, the second arcuate transition section 22 and the projection 21 are designed as an integral structure. In the embodiment of the present utility model, the second arcuate transition section 22 and the projection 21 are designed as an integral structure. Compared to the separate formation and subsequent welding of the second arcuate transition section 22 and the projection 21, the integral structure has no seams or weld points, exhibits good overall continuity, is able to distribute the force evenly, improves the strength and stiffness of the product, and reduces the risk of breakage. Moreover, in mass production, the integrated structure reduces the number of assembly steps, lowers labor costs and production cycles, and can lead to significant cost savings in the long run.

[0032] Furthermore, in an optional embodiment, the side wall of the groove 11 has a stepped structure, wherein the stepped structure, running from far to near along the direction of the current collector disk 2, comprises a first step 111 and a second step 112. 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.

[0033] Furthermore, in an optional embodiment, a distance M is provided between the stepped structure and the projection 21.

[0034] Furthermore, in an optional embodiment, the distance M is between 0.1 mm and 3 mm and the arc radius of the second arc-shaped transition section 22 is preferably in the range of 0.2 mm to 1.2 mm.

[0035] In the embodiment of the present utility model, the influence of the first arc-shaped transition section 14 on the mounting of the current collector disk 2 is less the greater the distance M is, so that the arc radius of the first arc-shaped transition section 14 can be correspondingly smaller.

[0036] Furthermore, in an optional embodiment, the thickness of the current collector disk 2D is between 0.1 mm and 2 mm.

[0037] Furthermore, in an optional embodiment, the arc radius of the second arc-shaped transition section 22 is in the range of 0.2 mm to 1.5 mm when the thickness D of the current collector disk 2 is between 0.1 mm and 1 mm. With such an arrangement, the thickness of the current collector disk 2 can be reduced accordingly, and the arc radius of the second arc-shaped transition section 22 can be increased, so that the arc radius of the first arc-shaped transition section 14 can be smaller, thereby ensuring the structural strength of the pole column 1 at the flange section 12.

[0038] In this embodiment, an annular groove 13 is further provided on the stepped structure, which ensures stable and precise positioning between the projection 21 of the current collector disc 2 and the groove 11 of the terminal column 1 during the welding process. This improves the reliability and stability of the welding and reduces welding defects. The stepped structure also contributes to forming a tighter seal in the weld area, preventing electrolyte leakage, improving battery sealing, extending battery life, and increasing safety. Furthermore, the stepped structure simplifies the alignment process between the current collector disc 2 and the terminal column 1, thus facilitating automated assembly. At the same time, it provides a clearer disassembly boundary for repairs or replacements of the current collector disc 2, reducing labor costs.

[0039] Furthermore, in an optional embodiment, as in Fig. 2 shows the thickness of the flange section 12 gradually decreasing along a direction away from the projection 21.

[0040] In the embodiment of the present utility model, the thickness of the flange section 12 gradually decreases to better accommodate changes in internal pressure during battery operation, particularly when the volume changes due to charge and discharge cycles. This gradual thickness can distribute stress unevenly, reduce local stress concentrations, and thus decrease the risk of fracture or deformation of the casing. Furthermore, the gradually decreasing thickness of the flange section 12 contributes to creating a more uniform heat-affected zone in the weld area, which facilitates efficient heat conduction, improves weld quality, and ensures a more reliable and stable weld joint between the projection 21 and the groove 11.

[0041] It should be noted that the gradually decreasing thickness also facilitates the embedding of the projection 21 of the current collector disc 2 into the groove 11, which simplifies the assembly process and reduces the risk of damage during assembly.

[0042] Although the embodiments of the present utility model are described in conjunction with the figures, the person skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope of protection defined by the attached claims.

Claims

[1] Cylindrical battery, characterized by that it includes the following: a case; a through-hole located on a side wall of the housing; a pole column (1) which extends partially through the through-hole; wherein a groove (11) is provided on the side of the pole column (1) facing the interior of the housing; and a flange section (12) is formed on the side wall of the groove (11), wherein the flange section (12) extends in the direction of the side wall which is adjacent to the flange section (12) of the housing in which the through-hole is located, in order to fasten the pole column (1) to the housing; a current collector disk (2) which is provided with a projection (21), wherein the projection (21) is embedded in the groove (11) and the projection (21) and the groove (11) are joined by welding; wherein the side wall of the groove (11) and the flange section (12) are connected by a first arcuate transition section (14), the arc radius of the first arcuate transition section (14) being in the range of 0.2 mm to 2 mm, and a gap is provided between the projection (21) and the first arc-shaped transition section (14), that the side wall of the groove (11) has a stepped structure, wherein the stepped structure along the direction of the current collector disk (2) has a first step (111) and a second step (112) in succession from far to near; and that 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] Cylindrical battery according to claim 1, characterized by , that the current collector disk (2) comprises the following: a disc body; the projection (21) which is arranged on the disk body; wherein the projection (21) and the disk body are connected by a second arcuate transition section (22); and in the radial direction of the groove (11) the radius of the disk body is larger than the radius of the projection (21); wherein the second arc-shaped transition section (22) is arranged opposite the first arc-shaped transition section (14) and a gap is provided between the second arc-shaped transition section (22) and the first arc-shaped transition section (14). [3] Cylindrical battery according to claim 2, characterized by , that the arc radius of the second arc-shaped transition section (22) lies between 0.2 mm and 2 mm.. [4] Cylindrical battery according to claim 3, characterized by , that the arc radius of the second arc-shaped transition section (22) is larger than the arc radius of the first arc-shaped transition section (14). [5] Cylindrical battery according to claim 4, characterized by , that the arc radius of the second arc-shaped transition section (22) is A and the arc radius of the first arc-shaped transition section (14) is B and A and B satisfy the following relationship: 1 [6] Cylindrical battery according to any one of claims 2 to 5, characterized by , that the second arc-shaped transition section (22) and the projection (21) form an integral structure. [7] Cylindrical battery according to any one of claims 2 to 5, characterized by , that a distance M is provided between the step structure and the projection (21). [8] Cylindrical battery according to claim 7, characterized by , that the distance M is between 0.1 mm and 3 mm and the extent of the second arc-shaped transition section (22) is between 0.2 mm and 1.2 mm. [9] Cylindrical battery according to any one of claims 2 to 5, characterized by ​, that the thickness of the current collector disk (2) is D and D is between 0.1 mm and 2 mm; and that if the thickness D of the current collector disk (2) is between 0.1 mm and 1 mm, the extent range of the second arcuate transition section (22) is between 0.2 mm and 1.5 mm. [10] Cylindrical battery according to any one of claims 1 to 5, characterized by , that the thickness of the flange section (12) gradually decreases in a direction away from the projection (21). [11] Cylindrical battery according to claim 1, characterized by , that the arc radius of the first arc-shaped transition section (14) is between 0.4 mm and 1.8 mm. [12] Cylindrical battery according to claim 3, characterized by , that the arc radius of the second arc-shaped transition section (22) is between 0.4 mm and 1.8 mm. [13] Cylinder battery according to claim 1, characterized by, that the opening radius of the groove (11) is larger than the radius of the projection (21).

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