Pole structure, cover plate assembly and battery monomer

Abstract

The invention provides a pole structure, a cover plate assembly and a battery monomer. The pole structure comprises a pole body and a pole bottom plate, the pole bottom plate comprises a pole section, a fusing structure section and a tab welding section which are sequentially connected along a first direction, the pole section is fixedly connected with one end of the pole body, and the tab welding section is suitable for being welded with a tab of a battery cell; wherein a plurality of convex hulls protruding relative to the surface of the tab welding section are arranged on the tab welding section, the convex hulls and the pole body are located on the same side of the pole bottom plate, and the convex hulls abut against the lower plastic cement; the first direction is the length direction of the pole bottom plate. According to the arrangement, the convex hull is propped against the lower plastic, and the heat insulation space is formed between the lower plastic and the tab welding section of the pole bottom plate, so that when the tab is welded with the tab welding section of the pole bottom plate, the lower plastic is prevented from being excessively heated, and the problem that in the prior art, when a fusing structure is arranged in a single battery body, the fusing structure cannot be fused is solved. The problems of reduction of the battery capacity and burning of lower plastic cement are solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a pole structure, a cover plate assembly and a battery cell. Background Art

[0002] In the structure of a battery cell, the cover plate assembly is an important component that ensures the overall strength and safety performance of the battery cell. In the related art, a battery cell is mainly composed of a shell, a battery cell, and a cover plate assembly. In order to provide overload protection, a connecting piece is usually set between the cover plate assembly and the battery cell. A fuse structure is set on the connecting piece. The connecting piece is connected between the pole on the cover plate assembly and the tab of the battery cell to achieve electrical connection between the pole and the battery cell. When the charge and discharge current is too large and exceeds the load capacity of the battery cell, the fuse structure on the connecting piece will melt, and the connecting piece will break, thereby disconnecting the electrical connection between the pole and the battery cell, achieving a circuit break and preventing further charge and discharge from causing danger. The applicant found that due to the setting of the fuse structure on the connecting piece, such a connecting piece structure will increase the bending space of the tab, and at the same time cause the tab length to increase, occupying too much internal space of the battery cell, resulting in a decrease in battery capacity. In addition, the connection between the tab and the cover plate assembly is generally made by laser welding. This process generates high temperature, causing local burns or even melting of the lower plastic, bringing the risk of insulation failure. Summary of the Invention

[0003] In view of this, the present application provides a pole structure, a cover plate assembly and a battery cell to solve the problem of how to avoid the reduction of battery capacity and prevent the lower plastic from being burned when a fuse structure is set in the battery cell in the prior art.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A pole structure, comprising:

[0006] pole body;

[0007] The pole base plate comprises a pole section, a fuse structure section and a tab welding section connected in sequence along a first direction, wherein the pole section is fixedly connected to one end of the pole body, and the tab welding section is suitable for welding to the tab of the battery cell;

[0008] The tab welding section is provided with a plurality of convex bumps protruding relative to the surface of the tab welding section, the convex bumps and the pole body are located on the same side of the pole bottom plate, and the convex bumps are in contact with the lower plastic; the first direction is the length direction of the pole bottom plate.

[0009] Optionally, a preset weld mark area is provided on the side of the tab welding section facing away from the convex bump, and the preset weld mark area is used to weld with the tab and form a weld mark; wherein:

[0010] The plurality of convex hulls are dispersedly distributed on two opposite sides of the preset welding area; or,

[0011] The plurality of convex hulls are dispersed around the preset weld print area.

[0012] Optionally, the convex bulges are distributed on both the side of the preset weld mark area close to the fuse structure section and the side away from the fuse structure section;

[0013] In the first direction, the distance between the convex bulge arranged away from the fuse structure segment and the preset weld print area is C, and the distance between the convex bulge arranged close to the fuse structure segment and the preset weld print area is D, 2mm≤C≤20mm, 2mm≤D≤20mm.

[0014] Optionally, the width direction of the pole bottom plate is the second direction, and the convex hulls are distributed on both opposite sides of the preset weld mark area in the second direction;

[0015] In the second direction, the distance between the convex hull on one side and the preset weld print area is E, and the distance between the convex hull on the other side and the preset weld print area is F, 2mm≤E≤20mm, 2mm≤F≤20mm.

[0016] Optionally, the width direction of the pole bottom plate is the second direction, and in the second direction, the distance between the preset weld mark area and the edge of the tab welding section is B, 2mm≤B≤20mm.

[0017] Optionally, the contact area between a single convex bump and the lower plastic is S, 1mm 2 ≤S≤250mm 2 .

[0018] Optionally, the height of the convex hull is H, 0.2mm≤H≤1.5mm.

[0019] Optionally, the convex hull is a solid cylinder or a hollow cylinder; and / or,

[0020] The end face of the convex hull is one of a circle, an ellipse, a waist, a ring and a polygon.

[0021] A cover plate assembly, comprising:

[0022] The cover body is provided with a pole hole;

[0023] A pole structure, inserted into the pole hole, wherein the pole structure is any one of the above pole structures;

[0024] An insulating component is sleeved around the pole body and is positionally connected to the cover body, the insulating component comprising an upper plastic, a sealing ring, and a lower plastic that are sequentially distributed;

[0025] A rivet block is provided on a side of the upper plastic away from the cover body, and the rivet block is riveted to the pole body;

[0026] The convex bump abuts against a side of the lower plastic away from the cover body, so as to construct a heat-insulating space between the lower plastic and the pole bottom plate.

[0027] A battery cell, comprising:

[0028] a housing having an open end;

[0029] A battery cell is disposed in the housing, and the battery cell has a tab;

[0030] a cover plate assembly, disposed at the open end of the shell to close the shell, the cover plate assembly being the above-mentioned cover plate assembly;

[0031] Wherein, the pole structure is welded to the pole tab through the pole tab welding section.

[0032] The pole structure provided in the present application includes a pole body and a pole base plate; the pole base plate includes a pole section, a fuse structure section and a pole tab welding section connected in sequence along a first direction, the pole section is fixedly connected to one end of the pole body, and the pole tab welding section is suitable for welding to the pole tab of the battery cell; wherein, the pole tab welding section is provided with a plurality of convex bumps protruding relative to the surface of the pole tab welding section, the convex bumps and the pole body are located on the same side of the pole base plate, and the convex bumps are in contact with the lower plastic; the first direction is the length direction of the pole base plate. With such a configuration, after the pole structure provided by the present application is applied to the assembly of the cover plate assembly, on the one hand, the arrangement of the connecting piece is eliminated, and the pole body and the pole bottom plate are integrated into an integrated structure. The pole bottom plate integrates multiple functions and is equipped with a fuse structure, and the pole tab welding section can provide a welding attachment position for the pole tab. The pole bottom plate and the pole tab are directly welded to realize the electrical connection between the pole structure and the battery cell. Since there is no connecting piece occupying the internal height space of the battery cell, the battery capacity of the battery cell can be retained; on the other hand, since the convex bump abuts against the lower plastic, the pole tab welding section of the pole bottom plate can avoid large-area contact with the lower plastic, and a heat-insulating space is constructed between the lower plastic and the pole tab welding section of the pole bottom plate. When the pole tab is welded to the pole tab welding section of the pole bottom plate, the lower plastic is prevented from being excessively heated, which solves the problem of how to avoid a decrease in battery capacity and prevent burns to the lower plastic when a fuse structure is set in the battery cell in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0034] Figure 1 A schematic diagram of the exploded structure of the cover plate assembly provided in an embodiment of the present application;

[0035] Figure 2 An axonometric diagram of the connection between the cover plate assembly and the tab provided in an embodiment of the present application;

[0036] Figure 3 A top view of the cover plate assembly provided in an embodiment of the present application;

[0037] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0038] Figure 5 Bottom view and side view of the connection between the pole structure and the tab provided in the embodiment of the present application;

[0039] Figure 6 A top view of the connection between the pole structure and the tab provided in an embodiment of the present application.

[0040] exist Figures 1-6 middle:

[0041] 100, pole structure; 200, cover body; 300, upper plastic; 400, sealing ring; 500, lower plastic; 600, rivet block; 700, pole ear;

[0042] 110. Pole body; 120. Pole base plate;

[0043] 121. Pole section; 122. Fuse structure section; 123. Tab welding section;

[0044] 1231, convex hull; 1232, preset welding mark area;

[0045] 210, pole hole;

[0046] 710. Welding mark. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] like Figures 1-6 As shown, an embodiment of the present application provides a pole structure 100, including a pole body 110 and a pole base plate 120; the pole base plate 120 includes a pole segment 121, a fuse structure segment 122 and a tab welding segment 123 connected in sequence along a first direction, the pole segment 121 is fixedly connected to one end of the pole body 110, and the tab welding segment 123 is suitable for welding with the pole tab 700 of the battery cell, that is, the side of the pole tab welding segment 123 away from the convex 1231 is used to provide a welding position for the pole tab 700; wherein, the tab welding segment 123 is provided with a plurality of convex bulges 1231 protruding relative to the surface of the pole tab welding segment 123, the convex bulge 1231 and the pole body 110 are located on the same side of the pole base plate 120, and the convex bulge 1231 is suitable for abutting against the lower plastic 500; the first direction is the length direction of the pole base plate 120. It should be noted that after the pole structure 100 is assembled into the cover plate assembly, the length direction of the pole base plate 120 is consistent with the length direction of the cover plate assembly.

[0049] In this way, after the pole structure 100 provided by the present application is applied to the assembly of the cover plate assembly, on the one hand, the arrangement of the connecting piece is cancelled, and the pole body 110 and the pole bottom plate 120 are integrated into an integrated structure. The pole bottom plate 120 integrates multiple functions and is equipped with a fuse structure, and the pole ear welding section 123 can provide a welding attachment position for the pole ear 700. The pole bottom plate 120 and the pole ear 700 are directly welded to realize the electrical connection between the pole structure 100 and the battery cell. Since there is no connecting piece occupying the internal height space of the battery cell, the battery cell can be retained. On the other hand, since the convex bump 1231 abuts against the lower plastic 500, it can prevent the tab welding section 123 of the pole bottom plate 120 from contacting the lower plastic 500 over a large area, and construct a heat-insulating space between the lower plastic 500 and the tab welding section 123 of the pole bottom plate 120. When the tab 700 is welded to the tab welding section 123 of the pole bottom plate 120, the lower plastic 500 is prevented from being excessively heated, thereby solving the problem of how to avoid a decrease in battery capacity and prevent burns to the lower plastic 500 when a fuse structure is provided in a battery cell in the prior art.

[0050] It should be noted that the design of the fuse structure on the pole base plate 120 can continue to use conventional designs in the prior art. For example, the melting point of the material of the fuse structure section 122 is lower than the melting point of the material of the pole section 121 and the tab welding section 123 , which will not be repeated here.

[0051] Regarding the specific distribution position of the convex bumps 1231, in some specific embodiments, a preset weld mark area 1232 is provided on the side of the tab welding section 123 facing away from the convex bump 1231. The preset weld mark area 1232 is used to weld to the tab 700 and form a weld mark 710. The number of the convex bumps 1231 is at least two; wherein:

[0052] The plurality of convex hulls 1231 are dispersedly distributed on two opposite sides of the preset weld imprint area 1232 ; or, the plurality of convex hulls 1231 are dispersedly distributed around the preset weld imprint area 1232 .

[0053] In order to better enable the convex hump 1231 to play its role, a location for welding and producing the weld mark 710 is planned and designed on the tab welding section 123, that is, the preset weld mark area 1232. The convex hump 1231 is arranged around the preset weld mark area 1232, which can better support the pole base plate 120 and facilitate the pressing force when supporting the pole tab 700 and the pole base plate 120 during welding.

[0054] Figure 1 As exemplarily shown in the figure, there are four convex bumps 1231 , which are respectively distributed at the four corners of the tab welding section 123 .

[0055] Furthermore, in some preferred embodiments, a convex bump 1231 is distributed on both the side of the predetermined weld mark 1232 close to the fuse structure section 122 and the side away from the fuse structure section 122. In the first direction, the distance between the convex bump 1231 located away from the fuse structure section 122 and the predetermined weld mark 1232 is C, and the distance between the convex bump 1231 located close to the fuse structure section 122 and the predetermined weld mark 1232 is D. 2mm≤C≤20mm, and 2mm≤D≤20mm. For example, the values ​​of C and D can be 2mm, 4mm, 5mm, 7mm, 8mm, 12mm, 16mm, 20mm, etc.

[0056] With such a configuration, after testing and verification, it was found that when C is less than 2 mm or D is less than 2 mm, the distance between the convex hump 1231 and the preset weld print area 1232 will be too close. When the tab 700 is welded to the tab welding section 123 of the pole bottom plate 120 according to this design, the lower plastic 500 contacted by the convex hump 1231 is prone to burns, resulting in a decrease in product yield; when C is greater than 20 mm or D is greater than 20 mm, in order to provide sufficient spacing, the length of the pole bottom plate 120 needs to be extended, resulting in a significant increase in the weight of the pole structure 100 and a significant increase in cost; when both C and D are within the above design range, it can be ensured that the part of the lower plastic 500 in contact with the convex hump 1231 is not burned, and the material cost of the pole structure 100 can be effectively controlled.

[0057] In other preferred embodiments, the width direction of the pole base plate 120 is the second direction, and convex bumps 1231 are distributed on opposite sides of the predetermined weld mark area 1232 in the second direction. In the second direction, the distance between the convex bump 1231 on one side and the predetermined weld mark area 1232 is E, and the distance between the convex bump 1231 on the other side and the predetermined weld mark area 1232 is F, where 2 mm ≤ E ≤ 20 mm, and 2 mm ≤ F ≤ 20 mm. For example, the values ​​of E and F can be 2 mm, 4 mm, 5 mm, 7 mm, 8 mm, 12 mm, 16 mm, 20 mm, etc.

[0058] With such a setting, after testing and verification, it was found that when E is less than 2 mm or F is less than 2 mm, the distance between the convex hump 1231 and the preset weld print area 1232 will be too close. When the tab 700 is welded to the tab welding section 123 of the pole bottom plate 120 according to this design, the lower plastic 500 contacted by the convex hump 1231 is prone to burns, resulting in a decrease in product yield; when E is greater than 20 mm or F is greater than 20 mm, in order to provide sufficient spacing, the length of the pole bottom plate 120 needs to be extended, resulting in a significant increase in the weight of the pole structure 100 and a significant increase in cost; when E and F both meet the above design ranges, it can be ensured that the part of the lower plastic 500 in contact with the convex hump 1231 is not burned, and the material cost of the pole structure 100 can be effectively controlled.

[0059] In some other preferred embodiments, the width direction of the terminal base plate 120 is the second direction. In the second direction, the distance between the weld mark area 1232 and the edge of the tab welding section 123 is preset to be B, and 2 mm ≤ B ≤ 20 mm. For example, the value of B can be 2 mm, 4 mm, 5 mm, 7 mm, 8 mm, 12 mm, 16 mm, 20 mm, etc.

[0060] With such a setting, after testing and verification, it was found that when B is less than 2 mm, the distance between the preset weld mark area 1232 and the edge of the tab welding section 123 is too close. When the tab 700 and the tab welding section 123 of the pole bottom plate 120 are welded according to this design, it is difficult to weld the tab 700 and the tab welding section 123, and it is difficult to position and press-fit. When B is greater than 20 mm, in order to provide sufficient spacing, the width of the pole bottom plate 120 needs to be widened, resulting in a significant increase in the weight of the pole structure 100 and a significant increase in cost. When B is within the above design range, it can ensure that the tab 700 and the tab welding section 123 of the pole bottom plate 120 are welded normally, and the material cost of the pole structure 100 can also be effectively controlled.

[0061] In some preferred embodiments, the contact area between a single convex bump 1231 and the lower plastic 500 is S, 1mm 2 ≤S≤250mm 2That is, S of any convex hull 1231 satisfies the above value range. If the end face of the convex hull 1231 is a plane, then S is also the end face area of ​​the convex hull 1231. For example, the value of S can be 1mm 2 , 3mm 2 , 8mm 2 , 12mm 2 , 40mm 2 , 60mm 2 , 80mm 2 Etc. With this setting, after testing and verification, it was found that when S is less than 1mm 2 When the contact area of ​​the convex bump 1231 is too small, the convex bump 1231 is easy to crush the lower plastic 500 when the tab 700 is welded and pressed with the tab welding section 123 of the terminal base plate 120, resulting in a decrease in product yield; when S is greater than 250mm 2 When S is within the above range, the contact area of ​​the convex hump 1231 is too large, and the distribution area on the tab welding section 123 is excessively occupied, resulting in insufficient distribution area of ​​the preset weld mark area 1232, causing the formed weld mark 710 to be too small, resulting in unreliable welding of the tab 700; when S meets the above range, it can avoid the hidden danger of the convex hump 1231 crushing the lower plastic 500, and at the same time ensure that the area of ​​the weld mark 710 is sufficient, and the tab 700 is reliably welded.

[0062] In other preferred embodiments, the height of the convex hump 1231 is H, and 0.2 mm ≤ H ≤ 1.5 mm. The height of the convex hump 1231 refers to the height of the convex hump 1231 protruding from the surface of the pole base plate 120. The value of H can be 0.2 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, etc.

[0063] With this arrangement, after testing and verification, it was found that when H is less than 0.2 mm, the insulation space formed by the convex bump 1231 between the tab welding section 123 of the pole bottom plate 120 and the lower plastic 500 is too small to effectively prevent the lower plastic 500 from being burned, resulting in a decrease in product yield; when H is greater than 1.5 mm, the overall height of the pole structure 100 will increase significantly, which will not only affect the internal space utilization of the battery cell, but also increase the material cost of the pole structure 100; when H is within the above design range, it can ensure that the lower plastic 500 is not burned, and can also effectively control the material cost of the pole structure 100, and ensure high internal space utilization of the battery cell.

[0064] In other optional embodiments, the convex bump 1231 is a solid cylinder or a hollow cylinder. A hollow cylinder is a cylinder with material missing from the center. This configuration makes the cylindrical convex bump 1231 easier to process and form. Furthermore, given the same end surface area, the annular cylindrical convex bump 1231 has a larger outer diameter, providing a more stable contact with the lower plastic 500, while the solid cylindrical convex bump 1231 offers greater structural strength. Both configurations can be flexibly selected based on design requirements.

[0065] Of course, in addition to this, it is also feasible to design the convex 1231 into a truncated cone shape or an inverted truncated cone shape.

[0066] In other optional embodiments, the end surface of the bump 1231 is one of a circle, an ellipse, a waist, a ring, and a polygon. The polygon can be a triangle, a rectangle, a pentagon, a hexagon, etc. The end surface of the bump 1231 is the portion for contacting the lower plastic 500.

[0067] Based on the above-mentioned pole structure 100, the embodiment of the present application further provides a cover assembly, which includes a cover body 200, a pole structure 100, an insulating assembly and a rivet block 600; the cover body 200 is provided with a pole hole 210; the pole structure 100 is inserted into the pole hole 210, and the pole structure 100 is the above-mentioned pole structure 100; the insulating assembly is sleeved around the pole body 110 and is limitedly connected to the cover body 200, and the insulating assembly includes The upper plastic 300, sealing ring 400, and lower plastic 500 are arranged in this order. A rivet block 600 is positioned on the side of the upper plastic 300 away from the cover body 200 and is riveted to the pole body 110. The bump 1231 abuts the side of the lower plastic 500 away from the cover body 200, or in other words, the bump 1231 abuts the bottom side of the lower plastic 500, creating a thermally insulating space between the lower plastic 500 and the pole base plate 120. Since this cover assembly includes the aforementioned pole structure 100, the beneficial effects of the cover assembly brought about by the pole structure 100 are described above and will not be elaborated upon here.

[0068] Based on the above-mentioned cover plate assembly, an embodiment of the present application further provides a battery cell, comprising a housing, a battery cell, and a cover plate assembly; the housing having an open end; the battery cell disposed in the housing, the battery cell having a tab 700; and a cover plate assembly disposed at the open end of the housing to seal the housing, the cover plate assembly being the above-mentioned cover plate assembly; wherein the pole structure 100 is welded to the tab 700 via the tab welding section 123, and the area of ​​the formed weld mark 710 is consistent with the predetermined weld mark area 1232. Since the battery cell includes the above-mentioned cover plate assembly, the beneficial effects of the battery cell brought about by the cover plate assembly are described above and will not be further elaborated here.

[0069] In addition, the present application records the test process to form a performance comparison of eight embodiments and ten comparative examples, as shown in Table 1. The following embodiments and comparative examples are used to further specifically describe the contents disclosed in the present application. These embodiments are only used for illustrative purposes, because various modifications and changes within the scope of the contents disclosed in the present application are obvious to those skilled in the art.

[0070] Table 1

[0071]

[0072] It can be seen that after the pole structure 100 provided in the present application is applied to the cover plate assembly and the battery cell, it can well achieve the functions and effects described above and improve the production yield of the battery cell.

[0073] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0074] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0075] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0077] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0078] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A pole structure, characterized in that: include: pole body; The pole base plate comprises a pole section, a fuse structure section and a tab welding section connected in sequence along a first direction, wherein the pole section is fixedly connected to one end of the pole body, and the tab welding section is suitable for welding to the tab of the battery cell; The tab welding section is provided with a plurality of convex bumps protruding relative to the surface of the tab welding section, the convex bumps and the pole body are located on the same side of the pole bottom plate, and the convex bumps are in contact with the lower plastic; the first direction is the length direction of the pole bottom plate.

2. The pole structure according to claim 1, characterized in that: A preset weld mark area is provided on the side of the tab welding section facing away from the convex bulge, and the preset weld mark area is used to weld with the tab and form a weld mark; wherein: The plurality of convex hulls are dispersedly distributed on two opposite sides of the preset welding area; or, The plurality of convex hulls are dispersed around the preset weld print area.

3. The pole structure according to claim 2, characterized in that: The convex bulges are distributed on both the side of the preset weld mark area close to the fuse structure section and the side away from the fuse structure section; In the first direction, the distance between the convex bulge arranged away from the fuse structure segment and the preset weld print area is C, and the distance between the convex bulge arranged close to the fuse structure segment and the preset weld print area is D, 2mm≤C≤20mm, 2mm≤D≤20mm.

4. The pole structure according to claim 2, characterized in that: The width direction of the pole bottom plate is the second direction, and the convex hulls are distributed on both sides of the preset weld mark area in the second direction; In the second direction, the distance between the convex hull on one side and the preset weld print area is E, and the distance between the convex hull on the other side and the preset weld print area is F, 2mm≤E≤20mm, 2mm≤F≤20mm.

5. The pole structure according to claim 2, characterized in that: The width direction of the pole bottom plate is the second direction. In the second direction, the distance between the preset weld mark area and the edge of the tab welding section is B, and 2mm≤B≤20mm.

6. The pole structure according to claim 1, characterized in that: The contact area between a single convex bump and the lower plastic is S, 1mm 2 ≤S≤250mm 2 .

7. The pole structure according to claim 1, characterized in that: The height of the convex hull is H, 0.2mm≤H≤1.5mm.

8. The pole structure according to claim 1, characterized in that: The convex hull is a solid cylinder or a hollow cylinder; and / or, The end face of the convex hull is one of a circle, an ellipse, a waist, a ring and a polygon.

9. A cover plate assembly, characterized in that: include: The cover body is provided with a pole hole; a pole structure, inserted into the pole hole, wherein the pole structure is the pole structure according to any one of claims 1 to 8; An insulating component is sleeved around the pole body and is positionally connected to the cover body, the insulating component comprising an upper plastic, a sealing ring, and a lower plastic that are sequentially distributed; A rivet block is provided on a side of the upper plastic away from the cover body, and the rivet block is riveted to the pole body; The convex bump abuts against a side of the lower plastic away from the cover body, so as to construct a heat-insulating space between the lower plastic and the pole bottom plate.

10. A battery cell, characterized in that: include: a housing having an open end; A battery cell is disposed in the housing, and the battery cell has a tab; a cover plate assembly, disposed at the open end of the housing to close the housing, the cover plate assembly being the cover plate assembly according to claim 9; Wherein, the pole structure is welded to the pole tab through the pole tab welding section.

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