Terminal post assembly, cover plate assembly and its battery

Abstract

This application relates to a terminal post assembly, a cover plate assembly, and a battery thereof, belonging to the technical field of blade batteries. The terminal post assembly includes a terminal post and a welding block; the terminal 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, and the size of the insertion part is larger than the size of the riveting part. The terminal post has a second through hole in the first direction; the welding block has a third through hole in the first direction, and the third through hole has an outwardly expanding inclined surface in the second direction; the third through hole of the welding block is sleeved outside the riveting part of the terminal post, and the inclined surface is on the side away from the limiting part; the riveting part forms a riveting rib that mates with the inclined surface through riveting, and the riveting rib is welded and fixed to the inclined surface. This improves the reliability of welding the terminal post to other components, reduces the internal resistance of the battery, reduces welding processes and parts, and ensures the reliability of welding the sealing plate body to other components, thereby improving battery performance.

Description

Technical Field

[0001] This application relates to the field of blade battery technology, and in particular to terminal assembly, cover assembly and battery thereof. 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 the development of technology, people are becoming increasingly eager for faster battery charging times. Currently, blade batteries are characterized by their thinness and round cover plates and terminals, which cannot meet the overcurrent requirements. Furthermore, the tabs and terminals need to be connected by connecting pieces, resulting in a large number of components and high internal resistance. The terminals also have long flanges, making the assembly process complex, time-consuming, and costly.

[0004] Therefore, we propose a pole assembly, a cover plate assembly, and its battery. Summary of the Invention

[0005] Therefore, it is necessary to address the technical problems of long flanges on the terminals, complex assembly steps, long time consumption, and high cost by providing a terminal assembly, cover plate assembly, and battery. By setting the structure and parameters of the terminals, the reliability of welding between the terminals and other components is ensured, costs are reduced, and battery performance is improved.

[0006] A first aspect of the present invention provides an electrode assembly, including an electrode and a welding block; the electrode includes a limiting part, an insertion part, and a riveting part arranged sequentially along a first direction.

[0007] In the second direction, the size of the limiting part is larger than the size of the insertion part, and the size of the insertion part is larger than the size of the riveting part;

[0008] The pole post is provided with a second through hole in the first direction; 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 sleeved outside the riveting part of the pole post, and the inclined surface is on the side away from the limiting part.

[0009] The riveted part forms a riveting rib that mates with the inclined surface through riveting, and the riveting rib is welded and fixed to the inclined surface.

[0010] Before the pole is riveted, the insertion part of the pole is located in the first through hole of the cover plate body, the limiting part and the riveting part are located on both sides of the cover plate body, the third through hole of the welding block is sleeved outside the riveting part of the pole, the riveting part of the pole is riveted to the inclined surface of the welding block, and the end of the riveting part after riveting forms a riveting rib, which is then welded to the inclined surface of the welding block.

[0011] In other embodiments, a groove is provided on the side of the limiting portion away from the riveting portion in the first direction.

[0012] In other embodiments, the limiting part is in the form of a ring track structure, the length L of the ring track structure is 15mm-85mm, and the width W of the ring track structure is 10mm-30mm.

[0013] In other embodiments, in the first direction, the depth of the groove is H2, 0.8mm < H2 < 1.5mm; the height of the riveted pole is H, 3mm < H - H2 < 6mm; the height of the limiting part is H1, 2.5mm < H1 < 3.2mm; the height of the welding block is H4, 0.8mm < H4 < 1.2mm; and the height of the riveting rib is H5, 0.3mm < H5 < 0.6mm.

[0014] In other embodiments, in the second direction, the inner diameter of the second through hole is D, 6mm < D < 25mm, the width of the groove is D1, the wall thickness of the insertion part is D2, 1.5mm < D2 < 3.0mm; the wall thickness of the riveting part is D3, 0.8mm < D3 < 1.8mm, and the radial projection width of the inclined surface of the welding block is D4, 0.3mm < D4 < 0.6mm.

[0015] In other embodiments, the angle between the inclined surface and the vertical surface of the first direction is α, where 35° < α < 65°.

[0016] A second aspect of the present invention provides a cover plate assembly, the cover plate assembly including a pole post assembly, a cover plate body, and a sealing plate body. The cover plate body is provided with a first through hole. In a second direction, 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. The insertion part is disposed in the first through hole, and the limiting part and the riveting part are respectively located on both sides of the cover plate body. The sealing plate body is disposed in a settling groove.

[0017] In other embodiments, the sealing plate body includes an end face, a pole mating part, and a pole lug welding part. The end face is welded to the busbar, the pole mating part is welded to the pole, and the pole lug welding part is welded to the pole lug of the pole group.

[0018] 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, a first plastic part is provided between the limiting part of the pole post and the cover plate body, and a second plastic part is provided between the welding block and the cover plate body.

[0019] In other embodiments, the first plastic part further includes an extension portion extending along a first direction from the outer edge of the first plastic part, and a limiting portion protruding from the extension portion in the first direction, with a protrusion height of H3, 0.2mm < H3 < 0.5mm.

[0020] A third aspect of the present invention provides a battery including a cover assembly, a housing, and an electrode assembly. The housing has a receiving space, the electrode assembly is disposed within the receiving space, and the cover assembly is 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

[0021] Figure 1 This is a three-dimensional schematic diagram of the battery in this application.

[0022] Figure 2 for Figure 1 Top view.

[0023] Figure 3 for Figure 2 Schematic diagram of the AA section.

[0024] Figure 4 for Figure 2 Schematic diagram of the BB cross section.

[0025] Figure 5 for Figure 4 Enlarged diagram of point C in the middle.

[0026] Figure 6 This is a sectional view of the pole before riveting in this application.

[0027] Figure 7 This is a three-dimensional schematic diagram of the pole post after riveting in this application. Figure 1 .

[0028] Figure 8 This is a three-dimensional schematic diagram of the pole post after riveting in this application. Figure 2 .

[0029] Figure 9 for Figure 7 Top view.

[0030] Figure 10 for Figure 9 Schematic diagram of the EE cross section.

[0031] Figure 11 This is a schematic cross-sectional view of the pole and welding block after welding in this application.

[0032] Figure 12 This is a schematic cross-sectional view of the cover plate body of this application.

[0033] Figure 13 This is a schematic cross-sectional view of the welded block in this application.

[0034] Figure 14 This is a schematic diagram showing the dimensions of the pole and welding block in this application.

[0035] Figure 15 This is a schematic diagram of the welding joint between the pole and the welding block, and the welding joint between the pole and the sealing plate body in this application.

[0036] Figure 16 This is a schematic cross-sectional view of the sealing plate in this application.

[0037] Reference numerals: 1. Housing; 2. Cover plate body; 3. First plastic part; 4. Pole post; 5. Sealing plate body; 6. Sealing ring; 7. Second plastic part; 8. Welding block; 9. Pole assembly; 10. Cover plate assembly;

[0038] 21. First through hole;

[0039] 41. Insertion part; 42. Limiting part; 43. Riveting rib; 44. Second through hole; 45. Countersunk groove; 46. Riveting part;

[0040] 51. End face section; 52. Pole post mating part; 53. Pole lug welding part;

[0041] 81. Third through hole; 82. Inclined surface;

[0042] 531. Guide angle. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] like Figures 6-13 As shown, a pole assembly includes a pole 4 and a welding block 8, wherein the pole 4 and the welding block 8 are welded and fixed.

[0050] 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, and the size of the insertion part 41 is larger than the size of the riveting part 46.

[0051] The pole post 4 is provided with a second through hole 44 in the first direction; 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 sleeved on the outside of 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; the riveting part 46 forms a riveting rib 43 that cooperates with the inclined surface 82 by riveting, and the riveting rib 43 is welded and fixed to the inclined surface 82.

[0052] In one embodiment, the shape of the third through hole 81 is determined by the shape of the riveting rib 43 of the pole post 4, and the inclined surface 82 is annular.

[0053] Before riveting the pole post 4, the insertion part 41 of the pole post 4 is set in the first through hole 21 of the cover plate body 2. In the second direction, 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. 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 on 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. After riveting, the end of the riveting part 46 forms a riveting rib 43, and the riveting rib 43 is welded to the inclined surface 82 of the welding block 8.

[0054] The limiting part 42 is provided with a groove 45 on the side away from the riveting part 46 in the first direction.

[0055] The pole 4 is a runway-shaped structure with a hollow center.

[0056] The sink 45 is welded and positioned to the sealing plate body 5, the riveting rib 43 is welded and fixed to the welding block 8, and the electrode lug of the electrode group 9 is bent in the second through hole 44, saving the space required for bending the electrode lug and improving the space utilization of the product.

[0057] like Figure 9 As shown, the length of pole 4 is L, and the width of pole 4 is W.

[0058] Specifically, 15mm < L < 85mm, 10mm < W < 30mm.

[0059] like Figure 14 As shown, in the first direction, the depth of the sink 45 is H2, 0.8mm < H2 < 1.5mm; the height of the pole 4 is H, 3mm < H - H2 < 6mm; the height of the limiting part 42 is H1, 2.5mm < H1 < 3.2mm; the first plastic part 3 also includes an extension portion extending along the first direction from the outer edge of the first plastic part 3, the limiting part 42 protruding from the extension portion in the first direction, the protrusion height being H3, 0.2mm < H3 < 0.5mm; the height of the welding block 8 is H4, 0.8mm < H4 < 1.2mm; the height of the riveting rib 43 is H5, 0.3mm < H5 < 0.6mm.

[0060] In the second direction, the inner diameter of the second through hole 44 is D, 6mm < D < 25mm; the difference between the inner diameter of the countersunk groove 45 and the inner diameter of the second through hole 44 is D1; ​​the wall thickness of the insertion part 41 is D2, 1.5mm < D2 < 3.0mm; the wall thickness of the riveting part 46 is D3, 0.8mm < D3 < 1.8mm; and the width of the inclined surface 82 of the welding block 8 is D4, 0.3mm < D4 < 0.6mm. The angle between the inclined surface 82 and the vertical plane in the first direction is α, 35° < α < 65°.

[0061] In one embodiment,

[0062] The electrode post 4 and the welding block 8 work together to form the electrode post assembly, which ensures the reliability of welding the electrode post 4 with other components, improves the performance of the battery, and is easy to operate and assemble, which helps to reduce production costs.

[0063] like Figure 15 As shown, the red dashed line at F is the weld mark at the welding point of pole post 4 and welding block 8; the red dashed line at Q is the weld mark at the welding point of pole post 4 and sealing plate body 5.

[0064] like Figures 1-16 As shown, a cover plate assembly 10 includes a cover plate body 2, a pole post assembly, and a sealing plate body 5.

[0065] The cover plate assembly 10 also includes a cover plate body 2 and a sealing plate body 5. The cover plate body 2 is provided with a first through hole 21. In the second direction, 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. The insertion part 41 is disposed in the first through hole 21. The limiting part 42 and the riveting part 46 are respectively located on both sides of the cover plate body 2. The sealing plate body 5 is disposed in the sink 45.

[0066] The connecting piece between the tabs of electrode assembly 9 and the sealing plate body 5 was eliminated. The tabs of electrode assembly 9 are directly welded to the sealing plate body 5, reducing the internal resistance of the product and reducing welding processes and components. Finally, the sealing plate body 5 is welded to the terminal post 4 to seal the second through hole 44. This ensures the reliability of welding the sealing plate body 5 to other components and improves the performance of the battery.

[0067] 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. A first plastic part 3 is provided between the limiting part 42 of the pole post 4 and the cover plate body 2. A second plastic part 7 is provided between the welding block 8 and the cover plate body 2.

[0068] The sealing plate body 5 includes an end face 51, a pole mating part 52 and a pole tab welding part 53 arranged sequentially along a first direction. The pole mating part 52 is welded to the pole 4, and the pole tab welding part 53 is welded to the pole tab of the pole group 9.

[0069] In one embodiment, the electrode welding portion 53 is provided with a guide angle 531.

[0070] In one embodiment, the end face 51, the pole mating part 52, and the pole ear welding part 53 are integrally formed structures.

[0071] 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 housing 1. The cover assembly 10 includes a cover body 2, a first plastic part 3, an electrode post 4, a sealing plate body 5, a sealing ring 6, a second plastic part 7, and a welding block 8.

[0072] 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.

[0073] In one embodiment, electrode group 9 can be two-terminal output tabs.

[0074] In one embodiment, electrode group 9 can also be an output electrode at one end.

[0075] In one embodiment, the cover body 2 may be integral with the housing 1.

[0076] In one embodiment, the cover body 2 may not be integral with the housing 1.

[0077] 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.

[0078] 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.

[0079] 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 assembly, characterized in that, Includes a pole post and a welding block; the pole post has a second through hole in a first direction; the pole post includes the following components arranged sequentially along the first direction: Limiting part; Insertion section; Riveted parts; In the second direction perpendicular to the first direction, the size of the limiting part is larger than the size of the insertion part, and the size of the insertion part is larger than the size of the riveting part; The welding block is provided with a third through hole in the first direction, and the third through hole is provided with an inclined surface that expands outward in the second direction; the welding block is sleeved on the outside of the riveting part of the pole post through the third through hole, and the inclined surface is on the side away from the limiting part. A portion of the riveted part is riveted to form a riveting rib that fits against the inclined surface, and the riveting rib is welded and fixed to the inclined surface.

2. The pole assembly according to claim 1, characterized in that, The limiting part is provided with a groove on the side away from the riveting part in the first direction.

3. The pole assembly according to claim 1, characterized in that, The limiting part has a ring-shaped track structure, with a length L of 15mm-85mm and a width W of 10mm-30mm.

4. The pole assembly according to claim 2, characterized in that, In the first direction, The depth of the settling tank is H2, 0.8mm < H2 < 1.5mm; and / or The height of the pole after riveting is H, 3mm < H - H2 < 6mm; and / or The height of the limiting part is H1, 2.5mm < H1 < 3.2mm; and / or The height of the weld block is H4, 0.8mm < H4 < 1.2mm; and / or The height of the rivet rib is H5, where 0.3mm < H5 < 0.6mm.

5. The pole assembly according to claim 4, characterized in that, In the second direction, The size of the second through hole is D, 6mm < D < 25mm; and / or The wall thickness of the insertion part is D2, 1.5mm < D2 < 3.0mm; and / or The wall thickness of the riveted part is D3, 0.8mm < D3 < 1.8mm, and / or The width of the inclined surface is D4, and 0.3mm < D4 < 0.6mm.

6. A pole post assembly according to any one of claims 2-5, characterized in that, The angle between the inclined surface and the vertical plane in the first direction is α, where 35° < α < 65°.

7. A cover plate assembly, comprising a pole post assembly as described in any one of claims 1-5, characterized in that, The cover plate assembly also includes a cover plate body and a sealing plate body. The cover plate body is provided with a first through hole. In the second direction, the size of the limiting part is larger than the size of the first through hole. The pole is inserted into the first through hole through the insertion part. The limiting part and the riveting part are located on both sides of the cover plate body. The sealing plate body is disposed in the sink.

8. A cover plate assembly according to claim 7, characterized in that, The cover plate body is a plate body. A sealing ring is provided between the inner surface of the first through hole and the pole post. A first plastic part is provided between the limiting part of the pole post and the cover plate body. A second plastic part is provided between the welding block and the cover plate body.

9. A cover plate assembly according to any one of claims 7-8, characterized in that, The first plastic part also includes an extension portion extending along a first direction from the outer edge of the first plastic part, and a limiting portion protruding from the extension portion in the first direction, with a protrusion height of H3, 0.2mm < H3 < 0.5mm.

10. A battery, characterized in that, The battery includes a cover assembly as described in any one of claims 7-9, and the battery 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 housing.

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