End cap sealing plate, cover plate assembly and its battery
By designing the terminal sealing plate, direct welding of the tabs and terminals in the blade battery was achieved, solving the problems of high internal resistance and poor welding reliability, and improving battery performance and assembly efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-17
AI Technical Summary
The existing blade battery's cover plate terminal design cannot meet the overcurrent requirements. A connecting piece is needed between the tab and the terminal, resulting in high internal resistance, poor welding reliability, and high cost.
A pole sealing plate was designed, including a sealing plate body. It achieves sealing and electrical connection through an integrally formed end face, pole mating part and pole lug welding part. The connecting piece between the pole lug and the sealing plate body is eliminated. The pole lug is directly welded to the sealing plate body, reducing welding processes and parts.
It reduces battery internal resistance, improves welding reliability, reduces welding processes and components, and enhances battery performance.
Smart Images
Figure CN224520000U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of blade battery technology, and in particular to terminal sealing plates, cover plate assemblies and their batteries. Background Technology
[0002] The blade battery features a long, strip-shaped cell design, reaching over 1 meter in length and only a few centimeters in thickness, resembling a "blade." Through structural innovation, the blade battery can skip the "module" stage during assembly, significantly improving volume utilization and ultimately achieving the design goal of fitting more cells into the same space.
[0003] With technological advancements, people are increasingly eager for faster battery charging times. Currently, blade batteries are characterized by their thinness and mostly circular cover plates and terminals, which cannot meet overcurrent requirements. Furthermore, the tabs and terminals require connecting tabs, resulting in numerous components and high internal resistance. Additionally, the terminals cannot be manufactured in a single process, requiring secondary processing, which increases costs. The sealing plate needs to be welded separately to the tabs, terminals, and busbar, but the welding reliability of existing sealing plates with other components is poor, affecting battery performance.
[0004] Therefore, we propose a pole sealing plate, a cover plate assembly, and its battery. Utility Model Content
[0005] Therefore, it is necessary to address the technical problems of poor welding reliability and high internal resistance between the sealing plate body and other components by providing the terminal sealing plate, cover plate assembly and its battery, thereby reducing the battery's internal resistance, reducing welding processes and components, ensuring the reliability of welding between the sealing plate body and other components, and improving battery performance.
[0006] The first aspect of this application provides a pole sealing plate, including a sealing plate body. The sealing plate body includes an end face, a pole mating part, and a pole tab welding part arranged sequentially along a first direction. The side of the pole mating part is sealed and electrically connected to the pole by welding with the pole. The pole tab welding part is electrically connected to the pole tab of the pole group by through welding.
[0007] The second direction is any direction perpendicular to the first direction. In the second direction, the size of the pole mating part is larger than the size of the end face part, and the size of the pole mating part is larger than the size of the pole tab welding part.
[0008] In other embodiments, the end face, the pole mating part, and the pole lug welding part are integrally formed structures.
[0009] In other embodiments, the electrode welding portion is provided with a guide angle at the end away from the electrode mating portion in the first direction, which makes the assembly of the sealing plate body and the electrode more convenient and improves the assembly efficiency.
[0010] In other embodiments, the electrode tab welding part is directly welded to the electrode tab of the electrode assembly; the connecting piece between the electrode tab and the sealing plate body is eliminated, and the electrode tab is directly welded to the sealing plate body, which reduces the internal resistance of the product and reduces welding processes and components.
[0011] In other embodiments, in the first direction, the thickness of the end face ranges from 0.1mm to 0.3mm to prevent the weld point from protruding from the sealing plate body and thus affecting the welding of the busbar. In the first direction, the thickness of the electrode mating portion ranges from 0.8mm to 1.5mm to ensure the welding strength and self-strength of the sealing plate body. In the first direction, the thickness T of the sealing plate body ranges from 2.5mm to 3.2mm to prevent excessive heat during busbar welding from damaging the electrode tabs of the electrode assembly. By setting the mating parameters and parameters of the sealing plate body, the shape and size of the sealing plate body are limited, ensuring the reliability of the welding between the sealing plate body and the electrode post and improving the battery performance.
[0012] A second aspect of this application provides a cover plate assembly, which includes a cover plate body, an electrode post, and a sealing plate body. The cover plate body has a first through hole, the electrode post is disposed in the first through hole, a groove is provided on the side of the electrode post away from the cover plate body in a first direction, the electrode post has a second through hole in the first direction, and the sealing plate body is disposed in the groove.
[0013] In other embodiments, the pole includes a limiting part, an insertion part, and a riveting part arranged sequentially along a first direction. In a second direction, the size of the limiting part is larger than the size of the insertion part, the size of the insertion part is larger than the size of the riveting part, the size of the limiting part is larger than the size of the first through hole, and the size of the insertion part is smaller than the size of the first through hole, thereby saving bending space of the pole tab and improving the space utilization of the product.
[0014] In other embodiments, the cover plate body is a plate body, an upper plastic is provided between the limiting part of the pole post and the cover plate body, and a lower plastic is provided between the welding block and the cover plate body.
[0015] In other embodiments, the cover plate assembly further includes a welding block that is welded to the pole post.
[0016] In other embodiments, the welding block is provided with a third through hole in the first direction, and the third through hole is provided with an outwardly expanding inclined surface in the second direction; the third through hole of the welding block is provided at the riveting part of the pole post, and the inclined surface is located on the side away from the limiting part in the first direction.
[0017] In other embodiments, a sealing ring is provided between the inner surface of the first through hole and the pole post, the cover plate body is a plate, an upper plastic is provided between the limiting part of the pole post and the cover plate body, and a lower plastic is provided between the welding block and the cover plate body.
[0018] A third aspect of this application provides a battery including a housing with a receiving space therein, an electrode assembly disposed within the receiving space, and a cover plate assembly disposed at at least one end of the electrode assembly. This reduces the battery's internal resistance, reduces welding processes and components, and ensures the reliability of welding the sealing plate body to other components, thereby improving battery performance. Attached Figure Description
[0019] Figure 1 This is a three-dimensional schematic diagram of the battery in this application.
[0020] Figure 2 for Figure 1 Top view.
[0021] Figure 3 for Figure 2 Schematic diagram of the AA section.
[0022] Figure 4 for Figure 2 Schematic diagram of the BB cross section.
[0023] Figure 5 for Figure 4 Enlarged diagram of point C in the middle.
[0024] Figure 6 This is a schematic diagram of the cover plate assembly of this application.
[0025] Figure 7 This is a three-dimensional schematic diagram of the sealing plate body of this application. Figure 1 .
[0026] Figure 8 This is a three-dimensional schematic diagram of the sealing plate body of this application. Figure 2 .
[0027] Figure 9 This is a schematic cross-sectional view of the sealing plate body of this application.
[0028] Figure 10 This is a schematic diagram of the welding joint between the pole and the welding block, the welding joint between the pole lug and the sealing plate body, and the welding joint between the pole and the sealing plate body in this application.
[0029] Figure 11 This is a sectional view of the pole before riveting in this application.
[0030] Figure 12 This is a sectional view of the pole post after riveting in this application.
[0031] Figure 13 This is a schematic cross-sectional view of the pole and welding block after welding in this application.
[0032] Figure 14 This is a schematic cross-sectional view of the cover plate body of this application.
[0033] Figure 15 This is a schematic cross-sectional view of the welded block in this application.
[0034] Reference numerals: 1. Housing; 2. Cover plate body; 3. Upper plastic; 4. Terminal post; 5. Sealing plate body; 6. Sealing ring; 7. Lower plastic; 8. Welding block; 9. Terminal assembly; 10. Cover plate assembly;
[0035] 21. First through hole;
[0036] 41. Insertion part; 42. Limiting part; 43. Riveting rib; 44. Second through hole; 45. Countersunk groove; 46. Riveting part;
[0037] 51. End face section; 52. Pole post mating part; 53. Pole lug welding part;
[0038] 81. Third through hole; 82. Inclined surface;
[0039] 531. Guide angle. Detailed Implementation
[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0044] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0045] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0046] like Figures 7-9 As shown, a pole sealing plate includes a sealing plate body 5, which includes an end face 51, a pole mating portion 52, and a pole lug welding portion 53 arranged sequentially along a first direction. The second direction is any direction perpendicular to the first direction.
[0047] The end face 51 is welded to the busbar, and the side of the pole mating part 52 is welded to the pole 4 to achieve sealing and electrical connection. The pole tab welding part 53 is electrically connected to the pole tab of the pole group 9 through welding.
[0048] In one embodiment, end face 51 can be welded to the busbar via other components.
[0049] In the second direction, the size of the pole mating part 52 is larger than the size of the end face 51, and the size of the pole mating part 52 is larger than the size of the pole tab welding part 53.
[0050] In the first direction, the thickness of the end face 51 ranges from 0.1mm to 0.3mm to prevent the weld points from protruding from the sealing plate body 5, thus avoiding affecting the welding of the busbar. In the first direction, the thickness of the terminal mating part 52 ranges from 0.8mm to 1.5mm to ensure the welding strength and self-strength of the sealing plate body 5. The electrode tab welding part 53 is provided with a guide angle 531 at the end away from the terminal mating part 52 in the first direction to ensure that the assembly of the sealing plate body 5 and the terminal 4 is more convenient and improves the assembly efficiency. In the first direction, the thickness T of the sealing plate body 5 ranges from 2.5mm to 3.2mm to prevent excessive heat during busbar welding from affecting and damaging the electrode tabs of the electrode group 9. By setting the mating parameters and parameters of the sealing plate body 5, the shape and size of the sealing plate body 5 are restricted, ensuring the reliability of the welding between the sealing plate body 5 and the terminal 4 and improving the performance of the battery.
[0051] In one embodiment, the end face 51, the pole mating part 52, and the pole ear welding part 53 are integrally formed structures.
[0052] In one embodiment, the electrode tab welding portion 53 is directly welded to the electrode tab of the electrode group 9.
[0053] like Figures 1-6 , Figures 11-15 As shown, a cover plate assembly 10 includes a cover plate body 2, a pole post 4, and a sealing plate body 5.
[0054] The cover plate assembly 10 also includes a cover plate body 2 and a pole post 4. The cover plate body 2 is provided with a first through hole 21, the pole post 4 is disposed in the first through hole 21, the pole post 4 is provided with a groove 45 on the side away from the cover plate body 2 in the first direction, the pole post 4 is provided with a second through hole 44 in the first direction, and the sealing plate body 5 is disposed in the groove 45.
[0055] The pole post 4 includes a limiting part 42, an insertion part 41 and a riveting part 46 arranged sequentially along a first direction. In a second direction, the size of the limiting part 42 is larger than the size of the insertion part 41, the size of the insertion part 41 is larger than the size of the riveting part 46, the size of the limiting part 42 is larger than the size of the first through hole 21, and the size of the insertion part 41 is smaller than the size of the first through hole 21.
[0056] The cover plate assembly 10 also includes a welding block 8, which is welded to the pole post 4.
[0057] The welding block 8 is provided with a third through hole 81 in the first direction, and the third through hole 81 is provided with an outwardly expanding inclined surface 82 in the second direction; the third through hole 81 of the welding block 8 is located outside the riveting part 46 of the pole post 4, and the inclined surface 82 is located on the side away from the limiting part 42 in the first direction.
[0058] A sealing ring 6 is provided between the inner surface of the first through hole 21 and the pole post 4. The cover plate body 2 is a plate. An upper plastic 3 is provided between the limiting part 42 of the pole post 4 and the cover plate body 2. A lower plastic 7 is provided between the welding block 8 and the cover plate body 2.
[0059] Before riveting, the insertion part 41 of the pole post 4 is in the first through hole 21 of the cover plate body 2, the limiting part 42 and the riveting part 46 are respectively located on both sides of the cover plate body 2, the third through hole 81 of the welding block 8 is sleeved outside the riveting part 46 of the pole post 4, the riveting part 46 of the pole post 4 is riveted to the inclined surface 82 of the welding block 8, and the end of the riveting part 46 after riveting forms a riveting rib 43, which is welded to the inclined surface 82 of the welding block 8.
[0060] The connecting tab between the electrode assembly 9 and the sealing plate body 5 was eliminated; the electrode tab is now directly welded to the sealing plate body 5, reducing internal resistance and the number of welding processes and components. Finally, the sealing plate body 5 is welded to the terminal post 4. This ensures the reliability of the welding between the sealing plate body 5 and other components, improving battery performance.
[0061] like Figure 10 As shown, the red dashed line at point D is the weld mark at the welding point of pole post 4 and welding block 8; the red dashed line at point E is the weld mark at the welding point of pole lug and sealing plate body 5; and the red dashed line at point F is the weld mark at the welding point of pole post 4 and sealing plate body 5.
[0062] like Figures 1-5 As shown, a battery includes a housing 1 with a receiving space therein, and an electrode group 9 is disposed in the receiving space of the housing 1. A cover assembly 10 is disposed at at least one end of the electrode group 9. The cover assembly 10 includes a cover body 2, an upper plastic 3, an electrode post 4, a sealing plate body 5, a sealing ring 6, a lower plastic 7, and a welding block 8.
[0063] In one embodiment, the structure of the other end of the pole group 9 may be the same as or different from that of the cover plate assembly 10.
[0064] In one embodiment, electrode group 9 can be two-terminal output tabs.
[0065] In one embodiment, electrode group 9 can also be an output electrode at one end.
[0066] In one embodiment, the cover body 2 may be integral with the housing 1.
[0067] In one embodiment, the cover body 2 may not be integral with the housing 1.
[0068] This reduces the battery's internal resistance, reduces welding processes and components, and ensures the reliability of welding the sealing plate body 5 to other components, thereby improving battery performance.
[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A pole seal plate, characterized by, Includes a sealing plate body, the sealing plate body comprising: sequentially arranged along a first direction: End face; The electrode mating part is welded to the electrode; The electrode lug welding section is welded to the electrode lug of the electrode assembly; In the second direction, the size of the pole mating part is larger than the size of the end face, and the size of the pole mating part is larger than the size of the electrode tab welding part.
2. A pole seal plate according to claim 1, wherein The end face, pole mating part, and pole lug welding part are integrally formed structures.
3. The pole sealing plate according to claim 2, characterized in that, The electrode tab welding part is provided with a guide angle at the end away from the electrode post mating part in the first direction.
4. A pole seal plate according to any one of claims 2-3, characterized in that In the first direction, the thickness of the end face ranges from 0.1mm to 0.3mm, the thickness of the pole mating part ranges from 0.8mm to 1.5mm, and the thickness of the sealing plate body ranges from 2.5mm to 3.2mm.
5. A cover plate assembly comprising a pole seal plate according to any one of claims 1 to 4, characterized in that The cover plate assembly also includes a cover plate body and an electrode post. The cover plate body is provided with a first through hole, the electrode post is disposed in the first through hole, the electrode post is provided with a groove on the side away from the cover plate body in a first direction, the electrode post is provided with a second through hole in the first direction, and the sealing plate body is disposed in the groove.
6. A cover plate assembly according to claim 5, wherein The pole post includes a limiting part, an insertion part, and a riveting part arranged sequentially along a first direction. In a second direction, the size of the limiting part is larger than the size of the insertion part, the size of the insertion part is larger than the size of the riveting part, the size of the limiting part is larger than the size of the first through hole, and the size of the insertion part is smaller than the size of the first through hole.
7. A cover plate assembly according to claim 6, wherein The cover plate assembly also includes a welding block, which is welded to the pole post.
8. A cover plate assembly according to claim 7, wherein The welding block is provided with a third through hole in the first direction, and the third through hole is provided with an outwardly expanding inclined surface in the second direction; the third through hole of the welding block is located outside the riveting part of the pole post, and the inclined surface is located on the side away from the limiting part in the first direction.
9. A cover assembly according to any one of claims 5 to 8, wherein, A sealing ring is provided between the inner surface of the first through hole and the pole post. The cover plate body is a plate. An upper plastic is provided between the limiting part of the pole post and the cover plate body, and a lower plastic is provided between the welding block and the cover plate body.
10. A battery, characterized by The battery includes a cover assembly as described in any one of claims 5-9, and further includes: The shell has an internal receiving space; The pole group is located within the accommodating space; The cover plate assembly is disposed at at least one end of the pole group.