Conductive member, cover plate assembly, and battery cell

Abstract

The application provides a conductive piece, a cover plate assembly and a battery cell. The conductive piece comprises a terminal and a pole; the terminal has a through hole and a riveting sink, the riveting sink is annularly arranged at one end of the through hole and communicates with the through hole, and a limiting block is arranged on the hole wall of the through hole; the pole comprises a first segment and a second segment connected with each other, the first segment is arranged in the through hole, one end of the first segment away from the second segment is outwardly protruded along the radial direction to form a riveting part, the riveting part is located in the riveting sink, and a limiting groove is arranged on the outer peripheral surface of the first segment; the second segment is in contact with the surface of the terminal away from the riveting sink, and the limiting block is located in the limiting groove. Through the above scheme, the relative rotation between the pole and the terminal can be limited, the bonding area between the pole and the terminal can be increased, and the connection reliability between the pole and the terminal can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a conductive component, a cover plate assembly, and a battery cell. Background Technology

[0002] In related technologies, a battery cell includes a housing, an electrode assembly disposed within the housing, and a cover plate assembly that covers the housing. The cover plate assembly includes a cover plate that covers the housing and a conductive element that passes through the cover plate. The conductive element serves as the electrode terminal of the battery cell, connecting the internal and external circuits of the battery cell. The conductive element may include a terminal post and a terminal. The middle part of the terminal post passes through the cover plate, one end of the terminal post is connected to the electrode assembly, and the other end of the terminal post is connected to the terminal. However, the connection between the terminal post and the terminal post has poor reliability, which adversely affects the reliability of the battery cell. Utility Model Content

[0003] Embodiments of this application provide a conductive element, a cover plate assembly, and a battery cell, which can improve the connection reliability between the electrode and the terminal.

[0004] In a first aspect, embodiments of this application provide a conductive component, which includes a terminal and a post. The terminal has a through hole and a riveting groove, the riveting groove being disposed around one end of the through hole and communicating with the through hole, and a limiting block being provided on the wall of the through hole. The post includes a first segment and a second segment connected to each other. The first segment passes through the through hole, and the end of the first segment away from the second segment protrudes radially outward to form a riveting portion, which is located in the riveting groove. A limiting groove is provided on the outer peripheral surface of the first segment. The second segment contacts the surface of the terminal opposite to the riveting groove, and the limiting block is located within the limiting groove. Thus, by providing the limiting groove and the limiting block that cooperates with the limiting groove, the relative rotation between the post and the terminal can be restricted, and the contact area between the post and the terminal can be increased, thereby improving the connection reliability between the post and the terminal.

[0005] In some embodiments, the surface of the limiting block facing the riveting part is flush with the bottom surface of the riveting groove. This increases the axial mating surface between the terminal and the electrode post, thereby improving the reliability of the terminal's axial upper limit positioning of the electrode post and preventing the electrode post from falling into the battery cell.

[0006] In some embodiments, the diameter of the first segment is Da, and the limiting groove in the radial direction of the pole post has a depth dimension D1, satisfying: 5%Da≤D1≤15%Da. In this way, on the one hand, the limiting block and the limiting groove have sufficient mating dimensions to maintain the relative stability of the terminal and the pole post and avoid the rotation of the terminals; on the other hand, it can prevent the depth dimension D1 of the limiting groove from being too large, which would reduce the structural strength of the pole post.

[0007] In some embodiments, the groove diameter of the press-fit groove is Db, and the diameter of the through hole is Da', satisfying: 1.5Da'≤Db≤2Da'. In this way, on the one hand, the size of the press-fit part can be guaranteed to ensure the reliability of the connection between the pole and the terminal; on the other hand, it can avoid the press-fit part being too large, which would lead to high molding difficulty, and the size of the press-fit groove can be controlled to avoid affecting the welding of the terminal to other components.

[0008] In some embodiments, along the axial direction of the conductive component, the depth of the countersunk groove is H1, and the height of the terminal is H2, satisfying: 40% H2 ≤ H1 ≤ 55% H2. This ensures a suitable fit between the riveted portion and the countersunk groove, guaranteeing reliable connection between the pole and the terminal, while also preventing the countersunk groove from being too large and affecting the terminal's strength, thus ensuring sufficient structural strength of the conductive component.

[0009] In some embodiments, the electrode post further includes a third segment connected to the end of the second segment furthest from the first segment, and the diameter of the third segment is larger than the diameter of the second segment. Thus, the third segment can be connected to the collector plate to increase the connection area between the electrode post and the collector plate, thereby improving the reliability of the connection between the electrode post and the collector plate.

[0010] In some embodiments, along the axial direction of the conductive element, the height dimension of the third segment is H3, and the height dimension of the pole is H4, satisfying: 15% H4 ≤ H3 ≤ 25% H4. This ensures that the third segment has sufficient height to guarantee its structural strength, while avoiding excessive thickness that would complicate the connection between the conductive element and the current collector.

[0011] In some embodiments, the diameter of the second segment is Dc, and the diameter of the third segment is Dd, satisfying: 2Dc≤Dd≤3Dc. This allows the third segment to have a larger diameter, providing a larger connection area between the conductive element and the current collector, while also preventing excessively large diameters from causing excessive tensile force from the outer periphery of the third segment at the connection point between the third and second segments, thus improving the stress state of the conductive element.

[0012] In some embodiments, an annular groove is provided on the side of the terminal away from the crimping groove, and the annular groove is located near the edge of the terminal. This increases the mating area between the terminal and the first insulating member, thereby improving the reliability of the connection between the terminal and the first insulating member.

[0013] In some embodiments, there are multiple limiting blocks, which are spaced apart circumferentially along the through hole, and multiple limiting grooves, which correspond one-to-one with the multiple limiting blocks. In this way, the relative rotation between the pole and the terminal can be restricted, and the contact area between the pole and the terminal can be increased.

[0014] Secondly, embodiments of this application provide a cover plate assembly, which includes a cover plate, a first insulating member, a second insulating member, a sealing member, and the aforementioned conductive member. A terminal is located on one side of the cover plate, and a second segment passes through the cover plate. The first insulating member is disposed between the terminal and the cover plate; the second insulating member is disposed on the side of the cover plate opposite to the terminal; and the sealing member is annularly disposed between the cover plate and the second segment. Thus, by providing a limiting groove and a limiting block that cooperates with the limiting groove, the relative rotation between the electrode and the terminal can be restricted, and the contact area between the electrode and the terminal can be increased, thereby improving the connection reliability between the electrode and the terminal and enhancing the reliability of the cover plate assembly.

[0015] Thirdly, embodiments of this application provide a battery cell comprising a housing, an electrode assembly, and the aforementioned cover assembly; the electrode assembly is disposed within the housing; the cover assembly is closed to the housing, and the electrode assembly is connected to the terminal post. Thus, by providing a limiting groove and a limiting block cooperating with the limiting groove, the relative rotation between the terminal post and the terminal can be restricted, and the contact area between the terminal post and the terminal can be increased, thereby improving the connection reliability between the terminal post and the terminal and enhancing the reliability of the battery cell.

[0016] The beneficial effects of the embodiments of this application are as follows:

[0017] In the embodiments of this application, by setting a limiting groove and a limiting block that cooperates with the limiting groove, the relative rotation between the pole post and the terminal can be restricted, and the contact area between the pole post and the terminal can be increased, thereby improving the connection reliability between the pole post and the terminal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the conductive element provided in an embodiment of this application;

[0022] Figure 4 yes Figure 3 A magnified structural diagram of part A in the middle;

[0023] Figure 5This is a schematic diagram of the conductive component forming process provided in an embodiment of this application;

[0024] Figure 6 This is a side view of a terminal provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1000 - Cell; 200 - Housing; 300 - Electrode assembly;

[0027] 100 - Cover plate assembly; 101 - First insulating component; 102 - Second insulating component; 103 - Sealing component; 104 - Cover plate; 105 - Collector plate;

[0028] 10 - Conductive components;

[0029] 11-Terminal; 111-Through hole; 112-Pressure groove; 113-Limit block; 114-Annular groove;

[0030] 12-Pole post; 121-First section; 122-Second section; 123-Third section; 124-Limiting groove; 125-Riveting part. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Before introducing the conductive component, cover plate assembly, and battery cell provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0036] In related technologies, the main assembly and connection methods for battery cells are welding and riveting. Welding is primarily used for the connection between the cell's cover plate and its housing. Welding is also used for connections between some structural components of the cover plate assembly. Riveting is mainly used for the assembly and connection of some components of the cover plate assembly. A cover plate assembly is typically composed of multiple components, including but not limited to the cover plate, insulating components, sealing components, terminals, poles, and current collectors. Insulating components are located between the cover plate and terminals, and between the cover plate and current collectors. Sealing components are annularly located around the poles and clamped between the cover plate and the poles to seal the mating gap between the poles and the cover plate.

[0037] One issue with laser welding assembly between the electrode post and the terminal is the potential for weld holes caused by weld spalling. These spallings can result in tiny weld holes that are difficult to inspect during quality control, leading to missed inspections. This can result in defective products being shipped out, increasing safety risks. Furthermore, the high power of laser welding can easily burn seals and insulation components during the welding process, reducing the seal between the cover plate and the electrode post and increasing safety risks.

[0038] When assembling the pole and terminal using riveting, one end of the pole protrudes from the terminal. Then, mechanical pressure is used to press the end of the pole through the terminal, reducing its height and increasing its radial dimension. This forces the end of the pole into the riveting groove on the terminal. The deformation of the pole's end creates a pressing part that restricts the terminal from moving away from the cover plate. In other words, the deformed end of the pole, combined with the cover plate, clamps the terminal between them. Thus, the cold deformation of the pole's end achieves a stable connection between the pole and the terminal; that is, the pole and terminal are riveted and fixed together.

[0039] Although riveting assembly can effectively avoid the problems caused by welding, the pole and terminal will rotate relative to each other during the riveting assembly process, and the mating surface between the pole and terminal is small, which will result in poor connection reliability between the pole and terminal, and there is a risk of disintegration under severe vibration.

[0040] Based on the above, embodiments of this application provide a conductive component, a cover plate assembly, and a battery cell, which can prevent relative movement between the electrode and the terminal during riveting and increase the mating surface between the electrode and the terminal to improve the connection reliability between the electrode and the terminal, thereby improving the reliability of the battery cell.

[0041] The following combination Figures 1 to 6 The present application provides a detailed description of a conductive element 10, a cover plate assembly 100, and a battery cell 1000 provided in the embodiments of this application.

[0042] Please see Figure 1 This application provides a battery cell 1000. The battery cell 1000 includes a housing 200, an electrode assembly 300, and a cover plate assembly 100. The electrode assembly 300 is disposed within the housing 200. The cover plate 104 closes the housing 200. The electrode assembly 300 is connected to the electrode post 12.

[0043] Understandably, the housing 200 is also used to store electrode liquid.

[0044] It is understood that in this embodiment, the battery cell 1000 can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this embodiment is not limited thereto. The battery cell 1000 can be cylindrical, flat, cuboid, or other shapes.

[0045] The electrode assembly 300 includes a positive electrode, a separator, and a negative electrode stacked sequentially. The separator insulates and isolates the positive and negative electrodes and provides channels for the flow of metal ions. The cell 1000 primarily relies on the movement of metal ions between the positive and negative electrodes to achieve charging and discharging. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the edge of the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the edge of the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc.

[0046] Please see Figure 2 This application provides a cover plate assembly 100. The cover plate assembly 100 includes a cover plate 104, a first insulating member 101, a second insulating member 102, a sealing member 103, and a conductive member 10. Terminals 11 of the conductive member 10 are located on one side of the cover plate 104. A second segment 122 of the conductive member 10 passes through the cover plate 104. The first insulating member 101 is disposed between the terminals 11 and the cover plate 104. The second insulating member 102 is disposed on the side of the cover plate 104 opposite to the terminals 11. The sealing member 103 is circumferentially disposed between the cover plate 104 and the second segment 122.

[0047] It is understood that the cover plate assembly 100 may also include a collector plate 105, and the end of the pole post 12 away from the terminal 11 is connected to the tab of the electrode assembly 300 through the collector plate 105.

[0048] It is understood that the first insulating component 101 is used to insulate and isolate the terminal 11 and the cover plate 104, and the second insulating component 102 is used to insulate and isolate the cover plate 104, the current collector 105, and the electrode assembly 300.

[0049] For example, both the first insulating member 101 and the second insulating member 102 are made of plastic. The sealing member 103 is made of rubber.

[0050] Specifically, a portion of the seal 103 is radially arranged between the second section 122 and the cover plate 104, and another portion of the seal 103 is axially arranged between the third section 123 of the conductive element 10 and the cover plate 104.

[0051] Please see Figure 3 and Figure 4This application provides a conductive component 10. The conductive component 10 includes a terminal 11 and a post 12. The terminal 11 has a through hole 111 and a riveting groove 112. The riveting groove 112 is circumferentially disposed at one end of the through hole 111 and communicates with the through hole 111. A limiting block 113 is provided on the wall of the through hole 111. The post 12 includes a first segment 121 and a second segment 122 connected to each other. The first segment 121 passes through the through hole 111. The end of the first segment 121 away from the second segment 122 protrudes radially outward to form a riveting portion 125. The riveting portion 125 is located in the riveting groove 112. A limiting groove 124 is provided on the outer peripheral surface of the first segment 121. The second segment 122 contacts the surface of the terminal 11 opposite to the riveting groove 112. The limiting block 113 is located within the limiting groove 124.

[0052] It is understandable that both terminal 11 and pole post 12 are metal parts.

[0053] It is understood that the pole post 12 is riveted to the terminal 11 so that the end of the first section 121 away from the second section 122 is radially deformed outward by the riveting pressure, thereby forming the press-fit part 125.

[0054] Specifically, before the pole post 12 is riveted to the terminal 11, the pole post 12 includes a first segment 121 and a second segment 122. A limiting groove 124 extends along the axis of the pole post 12 in a direction away from the second segment 122, and a groove port is formed on the end face of the first segment 121 opposite to the second segment 122. Figure 5 As shown in Figure (a), when assembling the pole post 12 and the terminal 11, the terminal 11 is moved to one end of the pole post 12, and the limiting block 113 is positioned opposite the slot port of the limiting groove 124. Then, the terminal 11 and the pole post 12 are moved towards each other, so that the terminal 11 is fitted onto the first segment 121, and the limiting block 113 slides from the slot port into the limiting groove 124, as shown in Figure (a). Figure 5 As shown in Figure (b). Then, the end of the first segment 121 furthest from the second segment 122 is pressed, reducing the axial dimension of the first segment 121 so that the end of the first segment 121 furthest from the second segment 122 protrudes radially outward to form a press-fit part 125, as shown. Figure 3 As shown. In this way, the pole 12 and the terminal 11 are riveted and fixed so as to achieve a stable connection between the pole 12 and the terminal 11 by utilizing the cold deformation of the end of the pole 12.

[0055] Specifically, the riveting part 125 is fitted into the riveting groove 112.

[0056] It is understood that the pole post 12 provided in this embodiment is a multi-segment structure with the diameter increasing from top to bottom. This structure allows the conductive component 10 to be subjected to uniform stress after cold deformation during riveting, thereby improving the connection strength between the pole post 12 and the terminal 11, resulting in a tight connection. Simultaneously, the good flatness of the conductive component 10's axial ends facilitates its fit with the connecting bar and the current collector 105, thus improving the reliability of the connection between the conductive component 10 and the connecting bar and current collector 105.

[0057] It is understood that before assembling the conductive component 10, the dimensions of the formed pressing part 125 can be adjusted by controlling the height of the first segment 121 beyond the terminal 11, thereby adjusting the interference between the pressing part 125 and the pressing groove 112. Thus, after the terminal 11 and the pole post 12 are riveted, the first segment 121 has sufficient deformable material to fully fill the microscopically uneven surfaces between the terminal 11 and the pole post 12, thereby eliminating the mating gap between the pole post 12 and the terminal 11, and improving the reliability and sealing of the connection between the pole post 12 and the terminal 11.

[0058] For example, terminal 11 and limit block 113 are integrally provided.

[0059] For example, the pole post 12 is a single piece.

[0060] In this embodiment, by providing a limiting groove 124 and a limiting block 113 that cooperates with the limiting groove 124, the relative rotation between the pole post 12 and the terminal 11 can be restricted, and the contact area between the pole post 12 and the terminal 11 can be increased, thereby improving the connection reliability between the pole post 12 and the terminal 11. At the same time, the current-carrying area between the pole post 12 and the terminal 11 can also be increased to improve the current-carrying capacity of the conductive component 10.

[0061] Please see Figure 4 In some embodiments, the surface of the limiting block 113 facing the riveting part 125 is flush with the bottom surface of the riveting groove 112. This increases the axial mating surface between the terminal 11 and the pole piece 12, thereby improving the reliability of the terminal 11 in axially limiting the pole piece 12 and preventing the pole piece 12 from falling into the cell 1000.

[0062] Please see Figure 4 In some embodiments, the diameter of the first segment 121 is Da, and the limiting groove 124 in the radial direction of the pole post 12 has a depth dimension D1, satisfying: 5%Da≤D1≤15%Da.

[0063] It can be understood that the depth dimension D1 of the limiting groove 124 includes, but is not limited to, 5% Da, 5.34% Da, 5.68% Da, 6.02% Da, 6.36% Da, 6.7% Da, 7.04%Da, 7.38%Da, 7.72%Da, 8.06%Da, 8.4%Da, 8.74%Da, 9.08%Da, 9.42%Da, 9.76%Da , 10.1%Da, 10.44%Da, 10.78%Da, 11.12%Da, 11.46%Da, 11.8%Da, 12.14%Da, 12.48%D a, 12.82% Da, 13.16% Da, 13.5% Da, 13.84% Da, 14.18% Da, 14.52% Da, 14.86% Da, 15% Da.

[0064] It is understandable that the radial dimension of the limiting block 113 is consistent with the depth dimension D1 of the limiting groove 124.

[0065] In this embodiment, by limiting the depth dimension D1 of the limiting groove 124, on the one hand, the limiting block 113 and the limiting groove 124 have sufficient mating dimensions to maintain the relative stability of the terminal 11 and the pole post 12 and avoid the rotation of the pole post. On the other hand, it can prevent the depth dimension D1 of the limiting groove 124 from being too large and reducing the structural strength of the pole post 12.

[0066] Please see Figure 3 and Figure 6 In some embodiments, the groove diameter of the press-fit groove 112 is Db, and the diameter of the through hole 111 is Da', satisfying: 1.5Da'≤Db≤2Da'.

[0067] It is understandable that the through hole 111 and the second section 122 are in clearance fit.

[0068] It can be understood that the groove diameter of the riveting groove 112 refers to the distance between the side of the riveting groove 112 and the axis of the conductive component.

[0069] It is understood that the groove diameter Db of the press-fit groove 112 is including but not limited to 1.5Da', 1.52Da', 1.54Da', 1.56Da', 1.58Da', 1.6Da', 1.62Da', 1.64Da', 1.66Da', 1.68Da', 1.7Da', 1.72Da', 1.74Da', 1.76Da', 1.78Da', 1.8Da', 1.82Da', 1.84Da', 1.86Da', 1.88Da', 1.9Da', 1.92Da', 1.94Da', 1.96Da', 1.98Da', and 2Da'.

[0070] Specifically, the groove diameter Db of the press-fit groove 112 is twice the diameter Da' of the through hole 111.

[0071] In this embodiment, the above-mentioned limitations can ensure the size of the riveting part 125 to ensure the reliability of the connection between the pole post 12 and the terminal 11. On the other hand, it can avoid the riveting part 125 being too large, which would make it difficult to form. It can also control the size of the riveting groove 112 to avoid affecting the welding of the terminal 11 with other components.

[0072] Please see Figure 3 In some embodiments, along the axial direction of the conductive element 10, the depth of the crimping groove 112 is H1, and the height of the terminal 11 is H2, satisfying: 40% H2≤H1≤55% H2.

[0073] It is understood that the depth H1 of the riveting groove 112 includes, but is not limited to, 0% H2, 40.5% H2, 41% H2, 41.5% H2, 42% H2, 42.5% H2, 43% H2, 43.5% H2, 44% H2, 44.5% H2, 45% H2, 45.5% H2, 46% H2, 46.5% H2, 47% H2, 47.5% H2, 48% H2, 48.5% H2, 49% H2, 49.5% H2, 50% H2, 50.5% H2, 51% H2, 51.5% H2, 52% H2, 52.5% H2, 53% H2, 53.5% H2, 54% H2, 54.5% H2, and 55% H2.

[0074] Specifically, the depth H1 of the press-fit groove 112 is half the height dimension H2 of the terminal 11.

[0075] In this embodiment, the above-mentioned limitations can ensure that the riveting part and the press-fit groove 112 have suitable mating dimensions, so as to ensure the reliability of the connection between the pole post 12 and the terminal 11. At the same time, it can avoid the press-fit groove 112 being too large and affecting the strength of the terminal 11, thereby ensuring that the conductive part 10 has sufficient structural strength.

[0076] Please see Figure 3 In some embodiments, the pole post 12 further includes a third segment 123. The third segment 123 is connected to the end of the second segment 122 that is away from the first segment 121. The diameter of the third segment 123 is larger than the diameter of the second segment 122. In this way, the third segment 123 can be connected to the collector plate 105 to increase the connection area between the pole post 12 and the collector plate 105, thereby improving the reliability of the connection between the pole post 12 and the collector plate 105.

[0077] Please see Figure 3In some embodiments, along the axial direction of the conductive element 10, the height dimension of the third segment 123 is H3, and the height dimension of the pole post 12 is H4, satisfying: 15% H4≤H3≤25% H4.

[0078] It can be understood that the height dimension H3 of the third section 123 includes, but is not limited to, 15% H4, 15.3% H4, 15.7% H4, 16% H4, 16.3% H4, 16.7% H4, 17% H4, 17.3% H4, 17.7% H4, 18% H4, 18.3% H4, 18.7% H4, 19% H4, 19.3% H4, 19.7% H4, 20% H4, 20.3% H4, 20.7% H4, 21% H4, 21.3% H4, 21.7% H4, 22% H4, 22.3% H4, 22.7% H4, 23% H4, 23.3% H4, 23.7% H4, 24% H4, 24.3% H4, 24.7% H4, 25% H4.

[0079] In this embodiment, the above-mentioned limitations ensure that the third segment 123 has sufficient height to guarantee its structural strength, while also preventing the third segment 123 from being too thick, which would make it difficult to connect the conductive element 10 to the current collector 105.

[0080] Please see Figure 3 In some embodiments, the diameter of the second segment 122 is Dc, and the diameter of the third segment 123 is Dd, satisfying: 2Dc≤Dd≤3Dc.

[0081] It is understood that the diameter Dd of the third segment 123 includes, but is not limited to, 2Dc, 2.03Dc, 2.07Dc, 2.1Dc, 2.13Dc, 2.17Dc, 2.2Dc, 2.23Dc, 2.27Dc, 2.3Dc, 2.33Dc, 2.37Dc, 2.4Dc, 2.43Dc, 2.47Dc, 2.5Dc, 2.53Dc, 2.57Dc, 2.6Dc, 2.63Dc, 2.67Dc, 2.7Dc, 2.73Dc, 2.77Dc, 2.8Dc, 2.83Dc, 2.87Dc, 2.9Dc, 2.93Dc, 2.97Dc, and 3Dc.

[0082] In this embodiment, the third segment 123 can have a larger diameter, so that there is a larger connection area between the conductive element 10 and the current collector 105. At the same time, it can avoid the large diameter of the third segment 123 causing a large tensile force from the outer periphery of the third segment 123 to be applied to the connection part between the third segment 123 and the second segment 122, so as to improve the stress state of the conductive element 10.

[0083] Please see Figure 3 In some embodiments, an annular groove 114 is provided on the side of terminal 11 facing away from the riveting recess 112. The annular groove 114 is located near the edge of terminal 11. It is understood that the side of terminal 11 facing away from the riveting recess 112 needs to contact the first insulating member 101 of the cover plate assembly 100 located between terminal 11 and cover plate 104. This increases the mating area between terminal 11 and the first insulating member 101, thereby improving the reliability of the connection between terminal 11 and the first insulating member 101.

[0084] It is understandable that the annular groove 114 is a stepped groove.

[0085] Please see Figure 6 In some embodiments, there are multiple limiting blocks 113. The multiple limiting blocks 113 are spaced apart circumferentially along the through hole 111. There are multiple limiting grooves 124. Each limiting groove 124 corresponds one-to-one with a limiting block 113. This not only restricts the relative rotation between the pole post 12 and the terminal 11, but also increases the contact area between the pole post 12 and the terminal 11.

[0086] For example, there are four limiting blocks 113 and four limiting grooves 124, and the limiting blocks 113 are centrally symmetrically distributed along the axis of the conductive element 10.

[0087] In some embodiments, the height dimension H2 of terminal 11 can be 2.0mm-10.0mm. It is understood that the range of values ​​for the height dimension H2 of terminal 11 is not limited, and it can be determined according to the actual design of the battery cell 1000 or other requirements.

[0088] In some embodiments, the outer diameter of terminal 11 can be in the range of 10.0-30.0 mm. It is understood that the range of values ​​for the outer diameter of terminal 11 is not limited, and it can be determined according to the actual design of the battery cell 1000 or other requirements.

[0089] The depth H1 of the riveting groove 112 can be 1.0-5.0mm. It can be understood that the value range of the depth H1 of the riveting groove 112 is not limited, and it is determined according to the actual design of the battery cell 1000 or other requirements.

[0090] The outer diameter Db of the riveting groove 112 can range from 5.0 to 15.0 mm. It can be understood that the range of values ​​for the outer diameter Db of the riveting groove 112 is not limited and can be determined according to the actual design of the battery cell 1000 or other requirements.

[0091] The dimension of terminal 11 in the axial direction of conductive element 10 can be 1.0-5.0 mm. It can be understood that the range of values ​​for the dimension of terminal 11 in the axial direction of conductive element 10 is not limited, and it is determined according to the actual design of cell 1000 or other requirements.

[0092] The diameter Da' of through hole 111 can be 2.5-7.5mm. It can be understood that the range of values ​​for the diameter Da' of through hole 111 is not limited, and it is determined according to the actual design of cell 1000 or other requirements.

[0093] In some embodiments, before the pole post 12 is riveted to the terminal 11, the height of the first segment 121 can be 2.5-7.5mm. It is understood that the range of the height of the first segment 121 is not limited, and it is determined according to the actual design of the battery cell 1000 or other requirements.

[0094] The diameter of the first segment 121 can be 2.0-7.0mm. It can be understood that the range of values ​​for the diameter of the first segment 121 is not limited, and the value is determined according to the actual design of the battery cell 1000 or other requirements.

[0095] The diameter Dd of the third segment 123 can be 20.0-40.0mm. It can be understood that the range of values ​​for the diameter Dd of the third segment 123 is not limited, and it is determined according to the actual design of the battery cell 1000 or other requirements.

[0096] The height dimension H3 of the third segment 123 can be 1.0-5.0mm. It can be understood that the value range of the height dimension H3 of the third segment 123 is not limited, and the value is determined according to the actual design of cell 1000 or other requirements.

[0097] The diameter Dc of the second segment 122 can be 5.0-15.0mm. It can be understood that the range of values ​​for the diameter Dc of the second segment 122 is not limited, and it is determined according to the actual design of the battery cell 1000 or other requirements.

[0098] The height of the second segment 122 can be 1.5-5.0mm. It can be understood that the range of values ​​for the height of the second segment 122 is not limited, and it is determined according to the actual design of the battery cell 1000 or other requirements.

[0099] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A conductive element (10), characterized in that, include: Terminal (11) has a through hole (111) and a riveting groove (112). The riveting groove (112) is arranged around one end of the through hole (111) and communicates with the through hole (111). A limit block (113) is provided on the hole wall of the through hole (111). The pole post (12) includes a first section (121) and a second section (122) connected to each other. The first section (121) passes through the through hole (111). The end of the first section (121) away from the second section (122) protrudes radially outward to form a pressing part (125). The pressing part (125) is located in the pressing groove (112). A limiting groove (124) is provided on the outer peripheral surface of the first section (121). The second segment (122) contacts the surface of the terminal (11) away from the riveting groove (112), and the limiting block (113) is located in the limiting groove (124).

2. The conductive element (10) according to claim 1, characterized in that, The surface of the limiting block (113) facing the riveting part (125) is flush with the bottom surface of the riveting groove (112).

3. The conductive element (10) according to claim 1, characterized in that, The diameter of the first segment (121) is Da, and the limiting groove (124) has a depth dimension D1 in the radial direction of the pole post (12), satisfying: 5%Da≤D1≤15%Da.

4. The conductive element (10) according to claim 1, characterized in that, The groove diameter of the press-fit groove (112) is Db, and the diameter of the through hole (111) is Da', satisfying: 1.5Da'≤Db≤2Da'.

5. The conductive element (10) according to any one of claims 1-4, characterized in that, Along the axial direction of the conductive element (10), the depth of the press-fit groove (112) is H1, and the height of the terminal (11) is H2, satisfying: 40%H2≤H1≤55%H2.

6. The conductive element (10) according to any one of claims 1-4, characterized in that, The pole post (12) further includes a third segment (123), which is connected to the end of the second segment (122) away from the first segment (121), and the diameter of the third segment (123) is larger than the diameter of the second segment (122).

7. The conductive element (10) according to claim 6, characterized in that, Along the axial direction of the conductive element (10), the height dimension of the third segment (123) is H3, and the height dimension of the pole (12) is H4, satisfying: 15%H4≤H3≤25%H4.

8. The conductive element (10) according to claim 6, characterized in that, The diameter of the second segment (122) is Dc, and the diameter of the third segment (123) is Dd, satisfying: 2Dc≤Dd≤3Dc.

9. The conductive element (10) according to any one of claims 1-4, characterized in that, An annular groove (114) is provided on the side of the terminal (11) away from the riveting groove (112), and the annular groove (114) is provided near the edge of the terminal (11).

10. The conductive element (10) according to any one of claims 1-4, characterized in that, There are multiple limiting blocks (113), which are spaced apart circumferentially along the through hole (111). There are multiple limiting grooves (124), which correspond one-to-one with the multiple limiting blocks (113).

11. A cover plate assembly (100), characterized in that, include: Cover plate (104); The conductive element (10) as described in any one of claims 1-10, wherein the terminal (11) is located on one side of the cover plate (104), and the second segment (122) passes through the cover plate (104); A first insulating element (101) is disposed between the terminal (11) and the cover plate (104); A second insulating element (102) is disposed on the side of the cover plate (104) opposite to the terminal (11); and A seal (103) is arranged in a ring between the cover plate (104) and the second section (122).

12. A battery cell (1000), characterized in that, include: Casing (200); An electrode assembly (300) is disposed within the housing (200); as well as The cover plate assembly (100) as claimed in claim 11, wherein the cover plate (104) covers the housing (200), and the electrode assembly (300) is connected to the electrode post (12).

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