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 first column and a second column; the first column comprises a first pressing block and a first boss connected with each other, and the first boss is provided with a first ring groove; the second column comprises a second pressing block and a second boss connected with each other, and the second boss is provided with a through hole at one end away from the second pressing block, the through hole penetrates through the second pressing block, and a connecting ring is arranged on the hole wall of the through hole; wherein the first boss is inserted into the through hole at the end away from the first pressing block, the connecting ring is located in the first ring groove, and the connecting ring is welded with the first boss. Through the above scheme, the area of the matching surface between the first column and the second column can be increased, so as to increase the area of the connecting surface between the first column and the second column. In this way, the welding between the first column and the second column can realize stable connection, so that the forming process of the conductive piece can be simplified, and the manufacturing efficiency 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 assembly that closes the opening of the housing. The cover assembly includes a cover plate that covers the housing, a conductive element mounted on the cover plate, and an insulating element that insulates and isolates the conductive element from the cover plate. The conductive element includes a terminal post and a terminal, the terminal being annular. One end of the terminal post is located outside the battery cell and passes through the terminal. The end of the terminal post is pressed to deform it radially outward for riveting to the terminal. The terminal post and terminal are then welded together, thus fixing the terminal post and terminal as a single unit. The other end of the terminal post is located inside the battery cell and can be connected to the tabs of the electrode assembly via a current collector.

[0003] Because the pole needs to be riveted to the terminal and then welded, the forming process is complicated and the manufacturing efficiency is low. Utility Model Content

[0004] The embodiments of this application provide a conductive component, a cover plate assembly, and a battery cell, which can simplify the molding process of the conductive component and improve manufacturing efficiency.

[0005] In a first aspect, embodiments of this application provide a conductive component, comprising a first post and a second post. The first post includes a first pressing block and a first boss connected together, with a first annular groove formed on the edge of the first boss away from the first pressing block. The second post includes a second pressing block and a second boss connected together, the outer diameter of the second boss being smaller than both the outer diameters of the first and second pressing blocks. A through hole is formed at the end of the second boss away from the second pressing block, penetrating the second pressing block, and a connecting ring is formed on the wall of the through hole. The end of the first boss away from the first pressing block extends into the through hole, and the connecting ring is located in the first annular groove and welded to the first boss. This increases the mating surface area between the first and second posts, thereby increasing the connection surface area between them. This allows for a stable connection between the first and second posts through welding, simplifying the forming process of the conductive component and improving manufacturing efficiency.

[0006] In some embodiments, a groove is provided on the side of the second pressure block opposite to the second boss, and a through hole penetrates the bottom of the groove. This reduces the amount of material used in the conductive components, thereby reducing their weight and facilitating lightweight cell design. It also increases the connection area between the second pressure block and the corresponding component, improving the reliability of the connection between them.

[0007] In some embodiments, a portion of the groove is disposed within the second boss. This increases the depth of the groove, thereby increasing the connection area between the second pressure block and the corresponding component, and reduces the weight of the conductive component, thus facilitating the lightweight design of the battery cell.

[0008] In some embodiments, the second boss has a first surface facing the first pressure block, and the thickness of the portion between the first surface and the bottom surface of the groove is D1, satisfying: 0.5mm ≤ D1 ≤ 1.5mm. Thus, by limiting the thickness D1, on the one hand, deformation of the second boss can be avoided, ensuring that this portion of the second boss has a suitable thickness to meet the strength requirements of the conductive component; on the other hand, excessive thickness in this portion of the second boss can be avoided, leading to material waste, thereby controlling the weight and material cost of the conductive component.

[0009] In some embodiments, the end face of the first boss away from the first pressure block is flush with the bottom surface of the groove. This improves the flatness of the inner wall of the groove, thus enhancing the appearance of the conductive component. Furthermore, during assembly, the alignment of the end face of the first boss away from the first pressure block with the bottom of the groove can be used to determine if the first and second posts are properly assembled, thereby improving the assembly efficiency of the conductive component.

[0010] In some embodiments, the weld mark formed by welding the connecting ring to the first boss is annular. This creates a continuous, closed annular weld between the first and second posts, effectively preventing electrolyte leakage. Furthermore, the annular weld is distributed around the axis of the conductive component, resulting in uniform stress distribution and enhancing the connection strength between the first and second posts, thereby improving the overall structural strength and load-bearing capacity of the conductive component.

[0011] In some embodiments, a second annular groove is provided on the surface of the first boss away from the first pressure block. The second annular groove is located inside the first annular groove and is configured to accommodate the weld marks between the connecting ring and the first boss. This prevents the weld marks formed by welding the first and second posts from extending beyond the connecting ring and the first boss, thereby improving the surface flatness of the welded area between the first and second posts and avoiding the need for additional grinding processes.

[0012] In some embodiments, a stepped groove is provided on the periphery of the connecting ring away from the surface of the first pressure ring and near the center of the through hole. The stepped groove extends annularly along the periphery of the connecting ring and is configured to accommodate the weld marks between the connecting ring and the first boss. This prevents the weld marks formed by welding the first and second posts from extending beyond the connecting ring and the first boss, thereby improving the surface smoothness of the welded area between the first and second posts and avoiding the need for additional grinding processes.

[0013] In some embodiments, the end of the second boss that faces away from the second pressure block contacts the first pressure block. Thus, during assembly, whether the conductive component is properly assembled can be determined by whether the second boss contacts the first pressure block, thereby improving the ease and efficiency of assembling the conductive component.

[0014] In some embodiments, the outer diameter of the first pressure block is equal to the outer diameter of the second pressure block. This ensures that the forces on both sides of the cover plate are consistent, thereby improving the stress state of the cover plate and preventing deformation.

[0015] 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 ring, and the aforementioned conductive member. The cover plate has a post hole; a first boss and a second boss are located in the post hole, and a first pressing block and a second pressing block are respectively located on both sides of the cover plate; the first insulating member is disposed between the first pressing block and the cover plate; the second insulating member is disposed between the second pressing block and the cover plate; the sealing ring is annularly disposed on the second boss to seal the mating portion between the cover plate and the conductive member. This increases the mating surface area between the first and second posts, thereby increasing the connection surface area between them. This allows for a stable connection between the first and second posts through welding, simplifying the forming process of the conductive member and improving manufacturing efficiency.

[0016] In some embodiments, the sealing ring includes a first ring and a second ring, the first ring being located between the first pressure block and the cover plate, and the second ring being located between the second boss and the hole wall of the pole post hole; wherein, the end of the second ring near the first pressure block is connected to the surface of the first ring facing the cover plate.

[0017] In some embodiments, a first mounting groove is provided on the surface of the cover plate near the first pressure block. The first mounting groove surrounds the pole hole and communicates with the pole hole. A first ring is disposed in the first mounting groove.

[0018] In some embodiments, a second mounting groove is provided on the side of the first insulating member away from the cover plate, and a portion of the first pressing block is located in the second mounting groove; wherein, the second mounting groove is a polygonal groove, and a portion of the first pressing block is fitted into the second mounting groove.

[0019] In some embodiments, a third mounting groove is provided on the surface of the cover plate away from the second pressure block, and a portion of the first insulating member is located in the third mounting groove; wherein, the third mounting groove is a polygonal groove, and a portion of the first insulating member is fitted into the third mounting groove.

[0020] 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 one of a first pressing block and a second pressing block is connected to the electrode assembly. This increases the mating surface area between the first and second posts, thereby increasing the connection surface area between them. This allows for a stable connection between the first and second posts to be achieved through welding, simplifying the forming process of the conductive components and improving manufacturing efficiency.

[0021] The beneficial effects of the embodiments of this application are as follows:

[0022] In the embodiments of this application, by setting a connecting ring located in the first annular groove and connected to the first boss, the mating surface area between the first post and the second post can be increased, thereby increasing the connection surface area between the first post and the second post. This allows for a stable connection between the first post and the second post through welding, simplifying the forming process of the conductive component and improving manufacturing efficiency. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0025] Figure 2 This is an exploded view of the cover plate assembly provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the conductive element provided in an embodiment of this application;

[0027] Figure 4 yes Figure 3 Enlarged view of section A;

[0028] Figure 5 This is a schematic diagram of the assembly of the conductive components provided in the embodiments of this application;

[0029] Figure 6 This is a schematic diagram showing the completed assembly of the conductive components provided in the embodiments of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1000-cell;

[0032] 100 - Cover assembly; 200 - Housing; 300 - Electrode assembly;

[0033] 10 - Conductive components;

[0034] 11-First pillar; 111-First pressure block; 112-First boss; 1121-First annular groove; 1122-Second annular groove;

[0035] 12-Second post; 121-Second pressure block; 1211-Groove; 122-Second boss; 1221-Through hole; 1222-First surface; 123-Connecting ring; 1231-Step groove;

[0036] 13- Solder mark;

[0037] 31-First insulating component; 311-Second mounting groove; 32-Second insulating component;

[0038] 33-Sealing ring; 331-First ring; 332-Second ring;

[0039] 34-Cover plate; 341-First mounting slot; 342-Pole post hole; 343-Third mounting slot;

[0040] 35 - Explosion-proof valve plate; 36 - Protective membrane. Detailed Implementation

[0041] 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.

[0042] 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 the description of this application, it should be noted that, unless otherwise explicitly 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 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0044] 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.

[0045] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery cell 1000 provided in an embodiment of this application. An embodiment of this application provides a battery cell 1000, which includes a housing 200, an electrode assembly 300, and the aforementioned cover plate assembly 100. The electrode assembly 300 is disposed within the housing 200. The cover plate 34 closes to the housing 200. One of the first pressing block 111 and the second pressing block 121 is connected to the electrode assembly 300.

[0046] It can be understood that the electrode assembly 300 includes a positive electrode, a separator, and a negative electrode stacked sequentially. The battery cell 1000 mainly relies on the movement of metal ions between the positive and negative electrode to store electrical energy or supply power to electrical devices. 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 serves 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 includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated negative current collector serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0047] For example, the second pressure block 121 is connected to the electrode assembly 300, and the first pressure block 111 is connected to the connecting bar. Thus, when a groove 1211 is provided on the second pressure block 121, the tab can be accommodated through the groove 1211 to reduce the height of the battery cell 1000, thereby increasing the energy density of the battery cell 1000.

[0048] For example, the first pressure block 111 is connected to the electrode assembly 300, and the second pressure block 121 is connected to the connecting bus. Thus, when the second pressure block 121 is provided with a groove 1211, it is inserted into the connecting bus through the groove 1211 to increase the current flow area between the battery cell 1000 and the connecting bus and the connection reliability.

[0049] Please see Figure 2 , Figure 2 This is an exploded view of a cover plate assembly 100 provided in an embodiment of this application. The cover plate assembly 100 provided in the embodiment of this application includes a cover plate 34, a first insulating member 31, a second insulating member 32, a sealing ring 33, and a conductive member 10. The cover plate 34 has a terminal post hole 342. A first boss 112 and a second boss 122 of the conductive member 10 are located in the terminal post hole 342. A first pressing block 111 and a second pressing block 121 of the conductive member 10 are located on opposite sides of the cover plate 34. The first insulating member 31 is disposed between the first pressing block 111 and the cover plate 34. The second insulating member 32 is disposed between the second pressing block 121 and the cover plate 34. The sealing ring 33 is annularly disposed around the second boss 122 to seal the mating portion between the cover plate 34 and the conductive member 10.

[0050] It is understood that when the second pressure block 121 is connected to the electrode assembly 300 and the first pressure block 111 is connected to the connecting bar, the first insulating component 31 can also be referred to as the upper plastic component, and the second insulating component 32 can also be referred to as the lower plastic component. At this time, the first insulating component 31 is also used to insulate and isolate the electrode assembly 300 from the cover plate 34, and to abut against the electrode assembly 300 to prevent the electrode assembly 300 from shaking relative to the outer casing of the battery cell 1000.

[0051] It is understandable that both the first insulating member 31 and the second insulating member 32 are provided with holes for the second boss 122 to pass through.

[0052] The cover plate 34 may include two conductive elements 10, one of which serves as the positive output terminal of the battery cell 1000, and the other conductive element 10 serves as the negative output terminal of the battery cell 1000. It can be understood that the conductive element 10 at the positive output terminal is connected to the positive electrode tab, and the conductive element 10 at the negative output terminal is connected to the negative electrode tab.

[0053] It is understood that the cover plate assembly 100 may also include an explosion-proof valve plate 35 and a protective film 36. The explosion-proof valve plate 35 is mounted on the cover plate 34, and the protective film 36 is disposed on the side of the explosion-proof valve plate 35 near the electrode assembly 300.

[0054] Please see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of the conductive element 10 provided in the embodiments of this application. Figure 4 yes Figure 3Enlarged view of part A. The conductive component 10 provided in the embodiments of this application includes a first post 11 and a second post 12. The first post 11 includes a first pressing block 111 and a first boss 112 connected together. A first annular groove 1121 is provided on the edge of the first boss 112 away from the end face of the first pressing block 111. The second post 12 includes a second pressing block 121 and a second boss 122 connected together. The outer diameter of the second boss 122 is smaller than the outer diameter of the first pressing block 111 and the outer diameter of the second pressing block 121. A through hole 1221 is provided at the end of the second boss 122 away from the second pressing block 121. The through hole 1221 penetrates the second pressing block 121. A connecting ring 123 is provided on the wall of the through hole 1221. The end of the first boss 112 away from the first pressing block 111 extends into the through hole 1221, and the connecting ring 123 is located in the first annular groove 1121 and is welded to the first boss 112.

[0055] Specifically, the welding between the connecting ring 123 and the first boss 112 can be laser welding.

[0056] It is understood that the outer diameter of the first boss 112 is smaller than the outer diameter of the second boss 122, so that a through hole 1221 for the first boss 112 to be inserted can be formed on the second boss 122.

[0057] It is understood that the outer diameter of the second protrusion 122 is smaller than the outer diameter of the first pressing block 111 and the outer diameter of the second pressing block 121. Therefore, when the conductive element 10 is applied to the cover plate assembly 100, the conductive element 10 is clamped on the cover plate 34 by the first pressing block 111 and the second pressing block 121 in a blocking engagement with the cover plate 34, so as to prevent the conductive element 10 from falling into the battery cell 1000 or from being pushed out of the cover plate 34 by the gas inside the battery cell 1000.

[0058] For example, the first pressing block 111 is integrally formed with the first boss 112, and the second pressing block 121 is integrally formed with the second boss 122.

[0059] Specifically, when welding the first pillar 11 to the second pillar 12, the various components of the cover plate assembly 100 are assembled first, such as... Figure 5 As shown, Figure 5 This is a schematic diagram of the assembly of the conductive component 10 provided in the embodiment of this application. At this time, the first post 11 and the second post 12 are not yet assembled. Then, under the action of the jig, the first post 11 and the second post 12 move towards each other to compress the sealing ring 33, thereby pressing the first pressure block 111 and the second pressure block 121 onto the first insulating component 31 and the second insulating component 32, respectively. Next, the first post 11 and the second post 12 are welded together, as shown below. Figure 6 As shown, Figure 6 This is a schematic diagram of the conductive component 10 provided in the embodiments of this application when it is assembled.

[0060] In this embodiment, by setting the connecting ring 123 to be located in the first annular groove 1121 and connected to the first boss 112, the mating surface area between the first post 11 and the second post 12 can be increased, thereby increasing the connection surface area between the first post 11 and the second post 12. This allows for a stable connection between the first post 11 and the second post 12 through welding, simplifying the forming process of the conductive component 10 and improving manufacturing efficiency.

[0061] Please see Figure 3 In some embodiments, the second pressure block 121 has a groove 1211 on the side opposite to the second boss 122. A through hole 1221 penetrates the bottom of the groove 1211. This reduces the amount of material used in the conductive component 10, thereby reducing its weight and facilitating the lightweight design of the battery cell 1000. It also increases the connection area between the second pressure block 121 and the corresponding component, thereby improving the reliability of the connection between the second pressure block 121 and the corresponding component.

[0062] Please see Figure 3 In some embodiments, a portion of the groove 1211 is disposed within the second boss 122. This increases the depth of the groove 1211, thereby increasing the connection area between the second pressure block 121 and the corresponding component, and reducing the weight of the conductive component 10, thus facilitating the lightweight design of the battery cell 1000.

[0063] Please see Figure 3 In some embodiments, the second boss 122 has a first surface 1222 facing the first pressing block 111, and the thickness of the portion between the first surface 1222 and the bottom surface of the groove 1211 is D1, which satisfies: 0.5mm≤D1≤1.5mm.

[0064] It is understood that the thickness D1 includes, but is not limited to, 0.5mm, 0.53mm, 0.56mm, 0.59mm, 0.62mm, 0.65mm, 0.68mm, 0.71mm, 0.74mm, 0.77mm, 0.80mm, 0.83mm, 0.86mm, 0.89mm, 0.92mm, 0.95mm, 0.98mm, 1.01mm, 1.04mm, 1.07mm, 1.10mm, 1.13mm, 1.16mm, 1.19mm, 1.22mm, 1.25mm, 1.28mm, 1.31mm, 1.34mm, 1.37mm, 1.40mm, 1.43mm, 1.46mm, 1.49mm, and 1.5mm.

[0065] In this embodiment, by limiting the thickness D1, on the one hand, deformation of the second protrusion 122 can be avoided, so that the part of the second protrusion 122 has a suitable thickness to meet the strength requirements of the conductive component 10. On the other hand, excessive thickness of the part of the second protrusion 122 can be avoided, which would lead to material waste, thereby controlling the weight and material cost of the conductive component 10.

[0066] Please see Figure 3 and Figure 4 In some embodiments, the end face of the first boss 112 away from the first pressure block 111 is flush with the bottom surface of the groove 1211. This improves the flatness of the inner wall of the groove 1211, thus enhancing the appearance of the conductive component 10. Furthermore, during assembly, the alignment of the end face of the first boss 112 away from the first pressure block 111 with the bottom surface of the groove 1211 can be used to determine if the first post 11 and the second post 12 are properly assembled, thereby improving the assembly efficiency of the conductive component 10.

[0067] In some embodiments, the weld 13 formed by welding the connecting ring 123 to the first boss 112 is annular. This creates a continuous, closed annular weld between the first post 11 and the second post 12, effectively preventing electrolyte leakage. Furthermore, the annular weld is distributed around the axis of the conductive element 10, resulting in uniform stress distribution and enhancing the connection strength between the first post 11 and the second post 12, thereby improving the overall structural strength and load-bearing capacity of the conductive element 10.

[0068] Please see Figure 4 A second annular groove 1122 is provided on the surface of the first boss 112 away from the first pressure block 111. The second annular groove 1122 is located inside the first annular groove 1121. The second annular groove 1122 is configured to accommodate the weld mark 13 between the connecting ring 123 and the first boss 112. In this way, the weld mark 13 formed by welding the first post 11 and the second post 12 can be prevented from extending beyond the connecting ring 123 and the first boss 112, thereby improving the surface flatness of the welded part between the first post 11 and the second post 12 and avoiding the need for additional grinding processes.

[0069] Please see Figure 4 In some embodiments, a stepped groove 1231 is provided on the periphery of the connecting ring 123 away from the surface of the first pressure block 111 and near the center of the through hole 1221. The stepped groove 1231 extends annularly along the periphery of the connecting ring 123 and is configured to accommodate the weld mark 13 between the connecting ring 123 and the first boss 112. In this way, the weld mark 13 formed by welding the first post 11 and the second post 12 can be prevented from extending beyond the connecting ring 123 and the first boss 112, thereby improving the surface flatness of the welded part between the first post 11 and the second post 12 and avoiding the need for additional grinding processes.

[0070] Please see Figure 4 In some embodiments, the end of the second protrusion 122 facing away from the second pressure block 121 contacts the first pressure block 111. In this way, during assembly, whether the conductive component 10 is assembled in place can be determined by whether the second protrusion 122 contacts the first pressure block 111, thereby improving the ease of operation and efficiency of assembling the conductive component 10.

[0071] Please see Figure 3 In some embodiments, the outer diameter of the first pressing block 111 is equal to the outer diameter of the second pressing block 121. This ensures that the forces on both sides of the cover plate 34 are consistent, thereby improving the stress state of the cover plate 34 and preventing deformation of the cover plate 34.

[0072] Please see Figure 6 In some embodiments, the sealing ring 33 includes a first ring 331 and a second ring 332. The first ring 331 is located between the first pressure block 111 and the cover plate 34. The second ring 332 is located between the second boss 122 and the wall of the pole hole 342. The end of the second ring 332 near the first pressure block 111 is connected to the surface of the first ring 331 facing the cover plate 34. This increases the sealing surface area between the conductive element 10 and the cover plate 34, thereby improving the reliability of the fit between the cover plate 34 and the conductive element 10.

[0073] It is understandable that the first ring 331 is under axial compression, while the second ring 332 is under radial compression.

[0074] Please see Figure 2 and Figure 6 In some embodiments, a first mounting groove 341 is provided on the surface of the cover plate 34 near the first pressure block 111. The first mounting groove 341 surrounds and communicates with the pole post hole 342, and the first ring 331 is disposed within the first mounting groove 341. In this way, the sealing ring 33 can be positioned and installed through the first mounting groove 341 to improve the installation efficiency of the sealing ring 33, and the radial deformation of the first ring 331 can be restricted through the first mounting groove 341, thereby increasing the axial compressive force of the first ring 331 and improving the sealing performance between the first ring 331, the cover plate 34, and the first pressure block 111.

[0075] Please see Figure 2 and Figure 6 In some embodiments, a second mounting groove 311 is provided on the side of the first insulating member 31 facing away from the cover plate 34. A portion of the first pressing block 111 is located within the second mounting groove 311. The second mounting groove 311 is a polygonal groove 1211, and a portion of the first pressing block 111 is fitted into the second mounting groove 311. Thus, the rotation of the first pressing block 111 relative to the first insulating member 31 can be restricted by the second mounting groove 311, which is a polygonal groove 1211, thereby improving the connection reliability between the first pressing block 111 and the corresponding component.

[0076] Please see Figure 2 and Figure 6 In some embodiments, a third mounting groove 343 is provided on the surface of the cover plate 34 facing away from the second pressure block 121. A portion of the first insulating member 31 is located within the third mounting groove 343. The third mounting groove 343 is a polygonal groove 1211, and a portion of the first insulating member 31 is fitted into the third mounting groove 343. Thus, the rotation of the first insulating member 31 relative to the cover plate 34 can be restricted by the third mounting groove 343, which is a polygonal groove 1211, thereby restricting the rotation of the conductive member 10 and improving the reliability of the connection between the conductive member 10 and the corresponding component.

[0077] For example, the first mounting groove 341 is located inside the second mounting groove 311, and the first mounting groove 341 is in communication with the second mounting groove 311.

[0078] 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: The first column (11) includes a first pressing block (111) and a first boss (112) connected to each other. The first boss (112) has a first annular groove (1121) on the edge of the end face away from the first pressing block (111). The second column (12) includes a second pressure block (121) and a second boss (122) connected to each other. The outer diameter of the second boss (122) is smaller than the outer diameter of the first pressure block (111) and the outer diameter of the second pressure block (121). A through hole (1221) is provided at one end of the second boss (122) away from the second pressure block (121). The through hole (1221) penetrates the second pressure block (121). A connecting ring (123) is provided on the hole wall of the through hole (1221). The first boss (112) extends into the through hole (1221) at one end away from the first pressure block (111), and the connecting ring (123) is located in the first ring groove (1121) and is welded to the first boss (112).

2. The conductive element (10) according to claim 1, characterized in that, The second pressure block (121) has a groove (1211) on the side opposite to the second boss (122), and the through hole (1221) penetrates the bottom of the groove (1211).

3. The conductive element (10) according to claim 2, characterized in that, A portion of the groove (1211) is disposed within the second boss (122).

4. The conductive element (10) according to claim 3, characterized in that, The second boss (122) has a first surface (1222) facing the first pressure block (111), and the thickness of the portion between the first surface (1222) and the bottom surface of the groove (1211) is D1, which satisfies: 0.5mm≤D1≤1.5mm.

5. The conductive element (10) according to any one of claims 2-4, characterized in that, The end face of the first boss (112) away from the first pressure block (111) is flush with the bottom surface of the groove (1211).

6. The conductive element (10) according to any one of claims 1-4, characterized in that, The weld mark (13) formed by welding the connecting ring (123) to the first boss (112) is annular.

7. The conductive element (10) according to claim 6, characterized in that, A second annular groove (1122) is provided on the surface of the first boss (112) away from the first pressure block (111). The second annular groove (1122) is located inside the first annular groove (1121). The second annular groove (1122) is configured to accommodate the solder mark (13) between the connecting ring (123) and the first boss (112).

8. The conductive element (10) according to claim 6, characterized in that, A stepped groove (1231) is provided on the periphery of the connecting ring (123) away from the first pressure block (111) and near the center of the through hole (1221). The stepped groove (1231) extends in a ring shape along the periphery of the connecting ring (123). The stepped groove (1231) is configured to accommodate the solder mark (13) between the connecting ring (123) and the first boss (112).

9. The conductive element (10) according to any one of claims 1-4, characterized in that, The end of the second protrusion (122) facing away from the second pressure block (121) is in contact with the first pressure block (111).

10. The conductive element (10) according to any one of claims 1-4, characterized in that, The outer diameter of the first pressing block (111) is equal to the outer diameter of the second pressing block (121).

11. A cover plate assembly (100), characterized in that, include: Cover plate (34) having pole hole (342); The conductive element (10) according to any one of claims 1-10, wherein the first boss (112) and the second boss (122) are located in the pole hole (342), and the first pressing block (111) and the second pressing block (121) are respectively located on both sides of the cover plate (34); A first insulating element (31) is disposed between the first pressure block (111) and the cover plate (34); A second insulating element (32) is disposed between the second pressure block (121) and the cover plate (34); and A sealing ring (33) is arranged around the second boss (122) to seal the mating part between the cover plate (34) and the conductive element (10).

12. The cover plate assembly (100) according to claim 11, characterized in that, The sealing ring (33) includes a first ring (331) and a second ring (332). The first ring (331) is located between the first pressure block (111) and the cover plate (34), and the second ring (332) is located between the second boss (122) and the hole wall of the pole hole (342). The second ring (332) is connected to the surface of the first ring (331) facing the cover plate (34) at one end near the first pressure block (111).

13. The cover plate assembly (100) according to claim 12, characterized in that, A first mounting groove (341) is provided on the surface of the cover plate (34) near the first pressure block (111). The first mounting groove (341) surrounds the pole hole (342) and communicates with the pole hole (342). The first ring (331) is disposed in the first mounting groove (341).

14. The cover plate assembly (100) according to claim 11, characterized in that, A second mounting groove (311) is provided on the side of the first insulating member (31) away from the cover plate (34), and a portion of the first pressure block (111) is located in the second mounting groove (311); The second mounting groove (311) is a polygonal groove (1211), and part of the first pressing block (111) is fitted into the second mounting groove (311).

15. The cover plate assembly (100) according to claim 11, characterized in that, A third mounting groove (343) is provided on the surface of the cover plate (34) opposite to the second pressure block (121), and a portion of the first insulating member (31) is located in the third mounting groove (343); The third mounting groove (343) is a polygonal groove (1211), and part of the first insulating member (31) is fitted into the third mounting groove (343).

16. 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 any one of claims 11-15, wherein the cover plate (34) covers the housing (200), and one of the first pressure block (111) and the second pressure block (121) is connected to the electrode assembly (300).

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