Pole, top cover assembly, battery monomer, battery and electric device

Abstract

The application provides a pole, a top cover assembly, a battery monomer, a battery and an electric device. The pole is used for being mounted on a cover plate. The pole comprises a limiting block and a conductive pole which are connected in sequence along a first direction. In the first direction, the orthogonal projection of the conductive pole is located in the orthogonal projection of the limiting block. The limiting block has a first surface facing the conductive pole. The first surface is provided with a first limiting part. The first limiting part is arranged in a staggered manner with the conductive pole. The conductive pole is used for extending into a mounting hole of the cover plate. The first limiting part is used for limiting cooperation with a second limiting part on the cover plate. When the pole and the cover plate are assembled, the conductive pole of the pole extends into the mounting hole of the cover plate, and the limiting block of the pole abuts against the cover plate. Meanwhile, the first limiting part on the limiting block and the second limiting part on the cover plate limit cooperation. Since the first limiting part is arranged in a staggered manner with the pole, the first limiting part can be restricted by the conductive pole, so as to reduce the risk of rotation of the pole on the cover plate.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to an electrode post, a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] The terminal is a crucial component connecting the inside and outside of a battery cell (also known as a single battery cell). Typically, one end of the terminal is connected to the external circuitry of the cell, such as to the module's contact plate, while the other end is connected to the internal circuitry, such as via a current collector and a tab in the electrode assembly. Most terminals are currently cylindrical and are mounted on the cell's cover plate, specifically through mounting holes in the cover plate. However, during use, the terminals are prone to rotation, which can easily cause them to separate from the external components of the cell or from the electrode assembly, leading to cell failure. Utility Model Content

[0003] The embodiments of this application provide an electrode post, a top cover assembly, a battery cell, a battery, and an electrical device, which can improve the technical problem of the electrode post easily rotating on the cover plate.

[0004] In a first aspect, embodiments of this application provide an electrode post for mounting on a cover plate. The electrode post includes a limiting block and a conductive post connected sequentially along a first direction. In the first direction, the orthographic projection of the conductive post is located within the orthographic projection of the limiting block. The limiting block has a first surface facing the conductive post. A first limiting portion is formed on the first surface. The first limiting portion is offset from the conductive post. The conductive post is used to extend into a mounting hole in the cover plate. The first limiting portion is used to limit and cooperate with a second limiting portion on the cover plate.

[0005] In the embodiments of this application, during the assembly of the electrode post and the cover plate, the conductive post with a smaller radial dimension on the electrode post extends into the mounting hole of the cover plate, while the limiting block with a larger radial dimension on the electrode post abuts against the cover plate. At the same time, a first limiting part is formed on the limiting block, and the first limiting part further limits and cooperates with the second limiting part on the cover plate. Since the first limiting part and the electrode post are misaligned, the first limiting part can restrain the conductive post, thereby reducing the risk of the electrode post rotating on the cover plate.

[0006] In one embodiment, the first limiting portion is a limiting groove on the first surface formed by partially thinning the limiting block.

[0007] By setting the first limiting part as a limiting groove, the second limiting part can be set as a boss, and the limiting is achieved by the boss and the limiting groove engaging in a concave-convex fit.

[0008] In one embodiment, the limiting block further has a second surface extending circumferentially along the limiting block and connected to the first surface, and the groove of the limiting groove extends to the second surface.

[0009] The above technical solution enables the second limiting part (e.g., boss) to extend into the limiting groove not only through the slot on the first surface of the limiting groove, but also through the slot on the second surface of the limiting groove. This makes the cooperation between the second limiting part and the limiting groove more flexible and reduces the restrictions on the position and shape of the second limiting part.

[0010] In one embodiment, the width of the limiting groove in the circumferential direction of the limiting block decreases along the radially outward direction of the pole post.

[0011] The above technical solution creates a "bottleneck" on the limiting groove. The position of this "bottleneck" is closer to the circumferential surface of the pole post than the position where the limiting groove is widest in the circumferential direction of the limiting block. In this way, when the limiting groove and the second limiting part (e.g., the boss) are in limiting engagement, the limiting groove and the second limiting part form an engagement, thereby making the engagement relationship between the second limiting part and the limiting block more stable and further reducing the risk of pole post displacement.

[0012] In one embodiment, the width of the limiting groove in the circumferential direction of the limiting block remains constant along the radially outward direction of the pole. This arrangement facilitates manufacturing.

[0013] In one embodiment, there are multiple limiting grooves, and all the limiting grooves are distributed at intervals along the circumference of the limiting block.

[0014] By increasing the number of limiting grooves and ensuring that each limiting groove is distributed on the limiting block, the stability and reliability of the fit between the limiting block and the cover plate are improved.

[0015] In one embodiment, in the first direction, the ratio of the depth of the limiting groove to the thickness of the limiting block is 0.1 to 0.5.

[0016] The above technical solution can ensure that the limiting groove has sufficient depth to stop the second limiting part, while ensuring the current carrying capacity of the pole.

[0017] In one embodiment, the end of the conductive post away from the limiting block is a welding step. Along the radial outward direction of the pole post, the welding step has a first step surface and a second step surface connected in sequence. The first step surface extends along the first direction, and the second step surface extends along a second direction intersecting the first direction.

[0018] By using the above technical solution, the risk of laser penetration can be reduced when using laser welding to weld the welding step to the electrode assembly.

[0019] In one embodiment, the height of the first step surface is greater than or equal to 0.6 mm in the first direction.

[0020] Increasing the height of the first step surface in the first direction can increase the welding area between the first step surface and the electrode assembly, thereby improving the welding effect.

[0021] In one embodiment, in the second direction, the width of one side of the second step surface is greater than or equal to 0.5 mm.

[0022] Increasing the width of the second step surface on one side in the second direction can increase the contact area between the second step surface and the electrode assembly, thereby improving the support effect on the electrode assembly.

[0023] In one embodiment, the electrode post is a composite electrode post, which includes a first metal part and a second metal part integrally formed. The first metal part and the second metal part are sequentially distributed in the first direction and jointly define the limiting block and the conductive post, wherein the second metal part is used to connect with the electrode assembly.

[0024] By setting the electrode post as a composite post that includes different metal parts, the electrode post can simultaneously achieve both performance and cost.

[0025] In one embodiment, on the outer surface of the composite pole, the boundary line between the first metal portion and the second metal portion is located on the limiting block.

[0026] With the above technical solution, when the composite pole and the cover plate are assembled together, part of the second metal part will be clamped between the cover plate and the first metal part, thereby improving the structural stability of the composite pole.

[0027] In one embodiment, the mating surface between the first metal portion and the second metal portion within the composite pole is a curved surface.

[0028] The above technical solution can increase the area of ​​the bonding surface between the first metal part and the second metal part, improve the bonding effect, and thus improve the structural stability of the composite pole.

[0029] In one embodiment, the composite pole is a cold-forged part.

[0030] Secondly, embodiments of this application provide a top cover assembly, including a cover plate and the aforementioned pole. The cover plate has an installation hole, and the conductive pole passes through the installation hole. The surface of the cover plate is also provided with a second limiting part, and the limiting block is supported on the surface of the cover plate, with the second limiting part and the first limiting part engaging in a limiting cooperation.

[0031] In one embodiment, the second limiting part is a protrusion on the cover plate.

[0032] Thirdly, embodiments of this application provide a battery cell including a housing, an electrode assembly, and the aforementioned top cover assembly. The top cover assembly covers the housing and defines a receiving cavity with the housing. The electrode assembly is disposed within the receiving cavity, and the terminal post is connected to the electrode assembly.

[0033] Fourthly, embodiments of this application provide a battery comprising the aforementioned battery cell.

[0034] Fifthly, embodiments of this application provide an electrical device, including the aforementioned battery cell or the aforementioned battery. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this application;

[0037] Figure 2 This is a three-dimensional structural diagram of a battery cell provided in an embodiment of this application;

[0038] Figure 3 This is a top view of a battery cell provided in an embodiment of this application;

[0039] Figure 4 yes Figure 3 Sectional view along the middle AA direction;

[0040] Figure 5 yes Figure 4 Enlarged view of section B;

[0041] Figure 6 This is a three-dimensional structural schematic diagram of the top cover assembly provided in an embodiment of this application;

[0042] Figure 7 This is a three-dimensional structural diagram of the cover plate provided in an embodiment of this application;

[0043] Figure 8 This is a three-dimensional structural diagram of the pole provided in an embodiment of this application from a certain perspective;

[0044] Figure 9 This is a three-dimensional structural diagram of the pole provided in an embodiment of this application from another perspective;

[0045] Figure 10 This is a bottom view of the pole structure provided in an embodiment of this application;

[0046] Figure 11 yes Figure 10 A cross-sectional view along the CC direction.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10. Pole post;

[0049] 11. Limiting block; 111. First surface; 112. First limiting part; 1121. Limiting groove; 113. Second surface; 114. Third surface;

[0050] 12. Conductive post; 121. Welding step; 1211. First step surface; 1212. Second step surface;

[0051] 101. First metal part; 102. Second metal part; 103. Boundary line; 104. Joint surface;

[0052] 20. Top cover assembly;

[0053] 21. Cover plate; 22. Mounting hole; 23. Second limiting part;

[0054] 30. Battery cell; 31. Housing; 32. Electrode assembly; 33. Receiving cavity;

[0055] 40. Battery;

[0056] 50. Electrical appliances. Detailed Implementation

[0057] 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.

[0058] 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, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0059] 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 technical features indicated. Therefore, a feature defined as "first" or "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.

[0060] 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.

[0061] 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0063] To facilitate understanding of the present application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: spline curves without arrows indicate solid parts, that is, parts with solid structures; spline curves with arrows indicate virtual parts, that is, parts without solid structures.

[0064] Please see Figure 1 Some embodiments of this application provide an electrical device 50 that uses a battery 40 as a power source. This electrical device 50 can be, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. In this electrical device 50, the battery 40 can serve as an operating power source or as a driving power source.

[0065] Please see Figure 1 and Figure 2 Some embodiments of this application provide a battery 40, which is included in an electrical device 50. The battery 40 refers to a device that can convert chemical energy into electrical energy. The battery 40 can have different forms, such as, but not limited to, a battery cell 30, a battery module, and a battery pack. Typically, battery modules and battery packs each independently include multiple battery cells 30 connected in series or parallel.

[0066] Please see Figures 2 to 5 Some embodiments of this application provide a battery cell 30. The battery cell 30 (also called a battery cell) is the basic unit for converting chemical energy into electrical energy. Optionally, the battery cell 30 is a secondary battery, such as a lithium-ion battery, in which case the battery cell 30 can realize the interconversion of chemical energy and electrical energy.

[0067] Please continue reading Figure 5 The battery cell 30 includes a housing 31, an electrode assembly 32, and a top cover assembly 20. The top cover assembly 20 covers the housing 31 and defines a receiving cavity 33 with the housing 31. The electrode assembly 32 is disposed within the receiving cavity 33. By assembling the housing 31 and the top cover assembly 20 together, an outer shell structure is formed. The receiving cavity 33 is located within the outer shell structure, and the electrode assembly 32 is disposed within the outer shell structure. The outer shell structure can protect the electrode assembly 32.

[0068] The electrode assembly 32 includes at least a positive electrode and a negative electrode arranged opposite to each other. The electrode assembly 32 can be a wound structure or a stacked structure.

[0069] The positive electrode sheet includes a positive electrode film layer, which contains a positive electrode active material. Optionally, the positive electrode active material includes at least one selected from lithium iron phosphate, lithium manganese iron phosphate, lithium nickel manganese oxide, lithium cobalt oxide, lithium-rich manganese-based oxide, and lithium manganese oxide. Further, the positive electrode film layer also includes a conductive agent and a binder. In the positive electrode sheet, the conductive agent includes at least one selected from carbon black, graphite, carbon nanotubes (CNTs), graphene, and carbon fibers, and the binder includes polyvinylidene fluoride (PVDF). In some embodiments, the positive electrode sheet is a self-supporting structure, comprising only the positive electrode film layer without a positive electrode current collector. In other embodiments, the positive electrode sheet also includes a positive electrode current collector, with the positive electrode film layer disposed on the positive electrode current collector. As an example, the positive electrode current collector includes aluminum foil.

[0070] The negative electrode sheet includes a negative electrode film layer containing a negative electrode active material. Optionally, the negative electrode active material includes at least one of carbon-based and silicon-based negative electrode materials. Further, the negative electrode film layer also includes a conductive agent and a binder. In the negative electrode sheet, the conductive agent includes at least one of carbon black, graphite, carbon nanotubes (CNTs), graphene, and carbon fibers, and the binder includes at least one of styrene-butadiene rubber (SBR) and polyacrylic acid (PAA). In some embodiments, the negative electrode sheet is a self-supporting structure, comprising only the negative electrode film layer without a negative electrode current collector. In other embodiments, the negative electrode sheet further includes a negative electrode current collector, with the negative electrode film layer disposed on the negative electrode current collector. As an example, the negative electrode current collector includes copper foil.

[0071] In some embodiments of this application, the electrode assembly 32 further includes a separator disposed between the positive electrode and the negative electrode to prevent short circuit caused by contact between the positive and negative electrode. The separator may be selected from one or more of polyolefin separators, non-woven separators, ceramic-coated separators, and composite separators. As an example, polyolefin separators include at least one of polyethylene (PE) membranes and polypropylene (PP) membranes. The separator may be a dry-process separator or a wet-process separator, and is not limited thereto.

[0072] In some embodiments of this application, the battery cell 30 further includes an electrolyte used to wet the electrode assembly 32. The electrolyte provides ion channels during the charging and discharging process of the battery cell 30, enabling charge transfer between the positive and negative electrodes, thereby completing energy storage and release. The electrolyte mainly includes a non-aqueous organic solvent, an electrolyte salt, and functional additives. Taking lithium-ion batteries as an example, the electrolyte salt includes lithium salts, specifically lithium hexafluorophosphate (LiPF6), lithium perchlorate, lithium bis(oxalato)borate (LiBOB), lithium difluorooxalato)borate (LiODFB), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and lithium bis(fluorosulfonyl)imide (LiFSI); the non-aqueous organic solvent includes at least one of carbonate solvents, carboxylic acid ester solvents, and ether solvents.

[0073] In some embodiments of this application, the electrode assembly 32 further includes a solid electrolyte membrane disposed between the positive electrode and the negative electrode. Optionally, the solid electrolyte membrane includes at least one of an oxide solid electrolyte, a sulfide solid electrolyte, and a polymer solid electrolyte.

[0074] In some embodiments of this application, the electrode assembly 32 further includes tabs. Specifically, the tabs include a positive tab and a negative tab, wherein the positive tab is connected to a positive electrode plate, for example, by welding, and the negative tab is connected to a negative electrode plate, for example, by welding. The terminal post 10 of the top cover assembly 20 is connected to the tabs of the electrode assembly 32, for example, by welding. It should be noted that the terminal post 10 and the tab can be directly connected or indirectly connected. Typically, on the top cover assembly 20, the terminal post 10 includes a positive terminal post and a negative terminal post, wherein the positive terminal post is connected to the positive tab, and the negative terminal post is connected to the negative tab.

[0075] In some embodiments of this application, the electrode assembly 32 further includes a current collector that connects the tab to the electrode post 10. As an example, the current collector includes at least one of a current collector plate and a connecting piece.

[0076] For some embodiments of this application, please refer to Figure 6 and Figure 7 The top cover assembly 20 includes a cover plate 21 and an electrode post 10. The cover plate 21 has a mounting hole 22, and the electrode post 10 passes through the mounting hole 22. The electrode post 10 can be used to connect to the electrode assembly 32 inside the receiving cavity 33, and the electrode post 10 can also be used to connect to an external circuit outside the receiving cavity 33, that is, the electrode assembly 32 is electrically connected to the external circuit through the electrode post 10.

[0077] Some embodiments of this application provide a pole post 10 for mounting on a cover plate 21. See also... Figures 8 to 11 The electrode post 10 includes a limiting block 11 and a conductive post 12 connected sequentially along a first direction. In the first direction, the orthographic projection of the conductive post 12 lies within the orthographic projection of the limiting block 11. The limiting block 11 has a first surface 111 facing the conductive post 12. A first limiting portion 112 is formed on the first surface 111. The first limiting portion 112 is offset from the conductive post 12, which is used to extend into the mounting hole 22 of the cover plate 21, and the first limiting portion 112 is used to limit and cooperate with a second limiting portion 23 on the cover plate 21.

[0078] The electrode post 10 is a conductive structure disposed on the cover plate 21 and used to connect the electrode assembly 32. Optionally, the electrode post 10 is a metal part. The electrode post 10 can be composed of a single metal or multiple metals. A mounting hole 22 is provided through the cover plate 21, and a second limiting part 23 is provided on the surface of the cover plate 21.

[0079] The electrode post 10 includes a limiting block 11 and a conductive post 12, which are connected sequentially along a first direction. For example, please refer to [reference needed]. Figure 11 The first direction is the Y-axis direction; please continue reading... Figure 8 and Figure 9 The limiting block 11 has two opposing side surfaces, namely a first surface 111 and a third surface 114. The limiting block 11 also has a second surface 113, which connects the first surface 111 and the third surface 114. The second surface 113 extends circumferentially along the limiting block 11 and is also referred to as the circumferential surface of the limiting block 11. A conductive post 12 is disposed on the first surface 111 of the limiting block 11 and connected to the limiting block 11. It can be understood that the first surface 111 faces the conductive post 12, and the third surface 114 is opposite to the conductive post 12. In one feasible embodiment, the conductive post 12 is integrally formed with the limiting block 11; in another feasible embodiment, the conductive post 12 is welded to the limiting block 11.

[0080] In the first direction, the orthographic projection of the conductive post 12 lies within the orthographic projection of the limiting block 11. As an example, the pole post 10 is T-shaped, with the limiting block 11 being disc-shaped and the conductive post 12 being cylindrical. The conductive post 12 is positioned in the central region of the limiting block 11, the first direction being the axial direction of the pole post 10, and the radial dimension of the conductive post 12 being smaller than the radial dimension of the limiting block 11. The diameter of the mounting hole 22 on the cover plate 21 can be designed such that the conductive post 12 can pass through but the limiting block 11 cannot. When the pole post 10 and the cover plate 21 are assembled together, the conductive post 12 passes through the mounting hole 22, and the limiting block 11 is supported on the surface of the cover plate 21, more specifically, on the side of the cover plate 21 facing away from the receiving cavity 33. Thus, the limiting block 11 is located outside the receiving cavity 33, and the limiting block 11 abuts against the cover plate 21, preventing the conductive post 12 from sliding into the receiving cavity 33.

[0081] The limiting block 11 is also provided with a first limiting part 112. The number of first limiting parts 112 on the limiting block 11 can be one or more. The position of the first limiting part 112 on the limiting block 11 can be near the center area of ​​the limiting block 11 or near the edge area of ​​the limiting block 11. To prevent positional conflict, the first limiting part 112 is offset from the conductive post 12, so that in the first direction, there is no overlap between the orthographic projection of the first limiting part 112 and the orthographic projection of the conductive post 12. When the pole post 10 and the cover plate 21 are assembled together, the conductive post 12 is used to extend into the mounting hole 22, and the first limiting part 112 is used to limit and cooperate with the second limiting part 23 on the cover plate 21, thereby achieving mutual limiting between the pole post 10 and the cover plate 21. Optionally, one of the first limiting part 112 and the second limiting part 23 is a groove, and the other is a protrusion; the groove and the protrusion engage in a recessed-protruding fit, thereby achieving limiting.

[0082] With the above technical solution, when the electrode post 10 and the cover plate 21 are assembled, the conductive post 12 with a smaller radial dimension on the electrode post 10 extends into the mounting hole 22 of the cover plate 21, while the limiting block 11 with a larger radial dimension on the electrode post 10 abuts against the cover plate 21. At the same time, a first limiting part 112 is formed on the limiting block 11. The first limiting part 112 further engages with the second limiting part 23 on the cover plate 21 for limiting. Since the first limiting part 112 and the conductive post 12 are misaligned, the first limiting part 112 can restrain the conductive post 12, thereby reducing the risk of the electrode post 10 rotating on the cover plate 21.

[0083] Please refer to some embodiments of this application. Figure 8 The first limiting portion is a limiting groove 1121 on the first surface 111, formed by partially thinning the limiting block 11. Specifically, the limiting block 11 is partially thinned, that is, the limiting block 11 is partially recessed inward, thereby forming the limiting groove 1121 on the limiting block 11, and the opening of the limiting groove 1121 is located on the first surface 111. In other words, the limiting groove 1121 is formed by the limiting block 11 partially recessed from the first surface 111. The second limiting portion 23 can be configured as a boss, which extends into the limiting groove 1121 and is adapted to fit the limiting groove 1121. By configuring the first limiting portion 121 as the limiting groove 1121, the second limiting portion 23 can be configured as a boss, and the limiting is achieved by the boss engaging with the limiting groove 1121.

[0084] Please refer to some embodiments of this application. Figure 8 The limiting block 11 also has a second surface 113 extending circumferentially along the limiting block 11 and connected to the first surface 111, and the groove of the limiting groove 1121 extends to the second surface 113. This allows the second limiting part 23 to extend into the limiting groove 1121 not only through the groove of the limiting groove 1121 located on the first surface 111, but also through the groove of the limiting groove 1121 located on the second surface 113. This makes the cooperation between the second limiting part 23 and the limiting groove 1121 more flexible and reduces the restrictions on the position and shape of the second limiting part 23. As an example, a portion of the second limiting part 23 extends into the limiting groove 1121 through the slot of the limiting groove 1121 on the second surface 113, while the other portion of the second limiting part 23 is located outside the limiting groove 1121. Compared to the method where the second limiting part 23 is completely contained within the limiting groove 1121, the length of the second limiting part 23 is increased, which can improve the strength of the second limiting part 23 and improve the stability of the fit between the second limiting part 23 and the limiting groove 1121.

[0085] Please refer to some embodiments of this application. Figure 10The width of the limiting groove 1121 in the circumferential direction of the limiting block 11 decreases along the radially outward direction of the pole post 10. The radially outward direction of the pole post 10, for example, is the direction from the center line of the pole post 10 to the second surface 113, and also the direction from the center of the pole post 10 to its edge. The width of the limiting groove 1121 in the circumferential direction of the limiting block 11 refers to the distance between the two sides of the limiting groove 1121 in the circumferential direction of the limiting block 11. See also [example description missing]. Figure 10 In the radial outward direction along the pole post 10, the width 'a' of the limiting groove 1121 in the circumferential direction of the limiting block 11 is greater than the width 'b'. It should be noted that in the radial outward direction along the pole post 10, the width of the limiting groove 1121 in the circumferential direction of the limiting block 11 can decrease monotonically, or it can decrease first and then increase, or increase first and then decrease.

[0086] The above-mentioned arrangement creates a "bottleneck" on the limiting groove 1121. The position of this "bottleneck" is closer to the circumferential surface of the pole post 10 than the position where the limiting groove 1121 has the largest circumferential width on the limiting block 11. Thus, when the limiting groove 1121 and the second limiting part 23 are engaged, the limiting groove 1121 and the second limiting part 23 form an interlocking action, thereby making the engagement relationship between the second limiting part 23 and the limiting block 11 more stable and further reducing the risk of displacement of the pole post 10.

[0087] In some embodiments of this application, the width of the limiting groove 1121 in the circumferential direction of the limiting block 11 remains unchanged along the radially outward direction of the pole post 10. For example... Figure 10 As shown, the width a of the limiting groove 1121 in the circumferential direction of the limiting block 11 is equal to the width b. This facilitates manufacturing. Of course, in another embodiment, the width of the limiting groove 1121 in the circumferential direction of the limiting block 11 can be increased in the radially outward direction along the pole post 10, so that the width a of the limiting groove 1121 in the circumferential direction of the limiting block 11 is less than the width b.

[0088] Please refer to some embodiments of this application. Figure 8 and Figure 10 There are multiple limiting grooves 1121, all of which are spaced apart along the circumference of the limiting block 11. As the number of limiting grooves 1121 increases, the number of corresponding second limiting portions 23 also increases, with each limiting groove 1121 engaging with one of the second limiting portions 23. For example, there are three limiting grooves 1121, which are spaced apart along the circumference of the limiting block 11 and around the conductive post 12. By increasing the number of limiting grooves 1121 and maintaining their dispersed distribution on the limiting block 11, the stability and reliability of the engagement between the limiting block 11 and the cover plate 21 are improved.

[0089] Please refer to some embodiments of this application. Figure 10 and Figure 11 In the first direction, the ratio of the depth H1 of the limiting groove 1121 to the thickness D of the limiting block 11 is 0.1 to 0.5. That is, the depth H1 of the limiting groove 1121 is no greater than half the thickness D of the limiting block 11, but also no less than one-tenth of the thickness D of the limiting block 11. This arrangement ensures that the limiting groove 1121 has sufficient depth to stop the second limiting portion 23 while maintaining the flow capacity of the pole post 10. As an example, the ratio of the depth H1 of the limiting groove 1121 to the thickness D of the limiting block 11 is 0.1, 0.2, 0.3, 0.4, or 0.5.

[0090] Please refer to some embodiments of this application. Figure 8 The end of the conductive post 12 away from the limiting block 11 is a welding step 121. In the radial outward direction along the pole post 10, the welding step 121 has a first step surface 1211 and a second step surface 1212 connected in sequence. The first step surface 1211 extends along a first direction, and the second step surface 1212 extends along a second direction intersecting the first direction.

[0091] The electrode post 10 is a structure that connects the electrode assembly 32 to an external circuit (e.g., a module plate). Specifically, the limiting block 11 is connected to the external circuit, while the conductive post 12 is connected to the electrode assembly 32. Typically, the end of the conductive post 12 furthest from the limiting block 11 is connected to the electrode assembly 32. The end of the conductive post 12 furthest from the limiting block 11 is configured as a welding step 121, which is welded to the electrode assembly 32.

[0092] The welding step 121 has a first step surface 1211 and a second step surface 1212 connected in sequence. The first step surface 1211 is closer to the centerline of the pole post 10 than the second step surface 1212, and the second step surface 1212 is closer to the edge of the pole post 10 than the first step surface 1211. The first step surface 1211 extends along a first direction, and the second step surface 1212 extends along a second direction. When the second direction intersects the first direction, the first step surface 1211 and the second step surface 1212 intersect. For example, please refer to [reference needed]. Figure 11 The second direction is perpendicular to the first direction, which is the Y-axis direction, and the second direction is the X-axis direction.

[0093] When welding the welding step 121 to the electrode assembly 32, specifically, the first step surface 1211 is welded to the electrode assembly 32, and the second step surface 1212 supports the electrode assembly 32. As an example, a welding through hole is provided on the connecting piece of the electrode assembly 32, and the welding step 121 extends into the welding through hole. The wall of the welding through hole corresponds to the first step surface 1211. Welding is performed through the gap between the wall of the welding through hole and the first step surface 1211 by laser welding. Due to the presence of the second step surface 1212, the second step surface 1212 can block the laser during the laser welding process, reducing the risk of laser penetration.

[0094] Please refer to some embodiments of this application. Figure 8 and Figure 11 In the first direction, the height H2 of the first step surface 1211 is greater than or equal to 0.6 mm. Increasing the height H2 of the first step surface 1211 in the first direction can increase the welding area between the first step surface 1211 and the electrode assembly 32, thereby improving the welding effect. As an example, the height H2 of the first step surface 1211 is 0.6 mm, 0.8 mm, 1.0 mm, or 1.5 mm.

[0095] Please refer to some embodiments of this application. Figure 8 and Figure 11 In the second direction, the single-sided width W of the second step surface 1212 is greater than or equal to 0.5 mm. The single-sided width W of the second step surface 1212 refers to the distance from the outer edge of the second step surface 1212 to the first step surface 1211. Increasing the single-sided width W of the second step surface 1212 in the second direction can increase the contact area between the second step surface 1212 and the electrode assembly 32, thereby improving the support effect on the electrode assembly 32. As an example, the single-sided width W of the second step surface 1212 is 0.5 mm, 1 mm, 1.2 mm, 1.4 mm, or 1.5 mm.

[0096] Please refer to some embodiments of this application. Figure 8 and Figure 11 The electrode post 10 is a composite electrode post, which includes a first metal part 101 and a second metal part 102 integrally formed. The first metal part 101 and the second metal part 102 are sequentially distributed in a first direction and jointly define the limiting block 11 and the conductive post 12. The second metal part 102 is used to connect with the electrode assembly 32.

[0097] The first metal portion 101 is made of a first metal, and the second metal portion 102 is made of a second metal. The first metal and the second metal are different, thus forming the electrode post 10 as a composite electrode post including the first metal and the second metal. As an example, one of the first metal and the second metal is copper, and the other is aluminum.

[0098] In a first direction, a first metal portion 101 and a second metal portion 102 are sequentially distributed. The first metal portion 101 and the second metal portion 102 together define a limiting block 11 and a conductive post 12. That is, the limiting block 11 includes a portion of the first metal portion 101 and a portion of the second metal portion 102, and the conductive post 12 also includes a portion of the first metal portion 101 and a portion of the second metal portion 102.

[0099] By setting the electrode post 10 as a composite electrode post that includes different metal parts, the electrode post 10 can simultaneously achieve both performance and cost.

[0100] Please refer to some embodiments of this application. Figure 10 and Figure 11 On the outer surface of the composite electrode, the boundary line 103 between the first metal portion 101 and the second metal portion 102 is located on the limiting block 11. When the composite electrode is manufactured by a cold forging process, the boundary line 103 can be formed in the gap between the first metal portion 101 and the second metal portion 102, and the average spacing of this gap is less than 0.1 mm. When the first metal and the second metal are different colors, the boundary line 103 can also be identified by the color change.

[0101] The dividing line 103 is located on the outer surface of the composite pole. If the dividing line 103 between the first metal part 101 and the second metal part 102 is located on the limiting block 11, then a portion of the second metal part 102 forms a portion on the limiting block 11 corresponding to the first surface 111. When the composite pole and the cover plate 21 are assembled together, the portion of the second metal part 102 will be clamped between the cover plate 21 and the first metal part 101, improving the structural stability of the composite pole, especially when the composite pole is a cold-forged part. It should be noted that the dividing line 103 between the first metal part 101 and the second metal part 102 can be located on the first surface 111, or on the second surface 113, or it can be the boundary line between the first surface 111 and the second surface.

[0102] Of course, in other embodiments, the dividing line 103 between the first metal part 101 and the second metal part 102 may also be located on the conductive post 12.

[0103] Please refer to some embodiments of this application. Figure 11 Within the composite electrode, the mating surface 104 between the first metal portion 101 and the second metal portion 102 is curved. This configuration increases the area of ​​the mating surface 104 between the first metal portion 101 and the second metal portion 102, improving the mating effect and thus enhancing the structural stability of the composite electrode. As an example, a portion of the first metal portion 101 protrudes and penetrates into the second metal portion 102, or a portion of the second metal portion 102 protrudes and penetrates into the first metal portion 101.

[0104] In some embodiments of this application, the composite electrode is a cold-forged part. Specifically, the composite electrode is prepared from a blank containing a first metal layer and a second metal layer through a cold-forging process. Because metals are ductile, during the cold-forging process, under pressure, the first and second metal layers deform, stretch, and penetrate, causing their interface to form a microscopically corrugated surface, thus improving the bonding strength. As an example, the composite electrode is formed from a copper-aluminum composite plate through cold forging. By designing the composite electrode as a cold-forged part, the first metal portion 101 and the second metal portion 102 can be effectively bonded together. Since the composite electrode is a cold-forged part, the bonding strength between the first metal part 101 and the second metal part 102 is limited. However, thanks to the first limiting part 112 being able to cooperate with the second limiting part 23 on the cover plate 21 to achieve limiting, the anti-torsion performance of the composite electrode on the cover plate 21 can be increased. Since the second metal part 102 is used to connect with the electrode assembly 32, it is equivalent to the second metal part 102 being limited by the electrode assembly 32. By using the cover plate 21 to further limit the composite electrode, the risk of the first metal part 101 and the second metal part 102 separating due to torsion can be reduced.

[0105] Some embodiments of this application provide a top cover assembly 20; please refer to [link to relevant documentation]. Figures 6 to 11 The top cover assembly 20 includes a cover plate 21 and a conductive post 12. The cover plate 21 has a mounting hole 22, through which the conductive post 12 passes. A second limiting portion 23 protrudes from the surface of the cover plate 21. A limiting block 11 is supported on the surface of the cover plate 21, and a first limiting portion 121 engages with the second limiting portion 23. By utilizing the engagement between the first limiting portion 121 on the conductive post 10 and the second limiting portion 23 on the cover plate 21, the first limiting portion 121 and the conductive post 12 can mutually restrain each other, thereby reducing the risk of the conductive post 10 rotating on the cover plate 21.

[0106] For some embodiments of this application, please refer to Figure 7 The second limiting part 23 is a boss protruding from the cover plate 21. Thus, when the first limiting part 121 is a limiting groove 1121, the boss and the limiting groove 1121 cooperate to achieve limiting.

[0107] For some embodiments of this application, please refer to Figure 7 The cover plate 21 includes a cover plate body, a first insulating member, and a second insulating member, wherein the first insulating member and the second insulating member are respectively arranged on both sides of the cover plate body. The cover plate 21 is provided with a mounting hole 22, which penetrates the cover plate body, the first insulating member, and the second insulating member. As an example, the cover plate body is a smooth aluminum sheet, and both the first and second insulating members are plastic parts. Optionally, a second limiting part 23 is provided on the first insulating member.

[0108] In some embodiments, the top cover assembly 20 also includes a seal disposed between the cover plate 21 and the electrode post 10 to seal the gap between the electrode post 10 and the mounting hole 22 to prevent electrolyte leakage from there.

[0109] 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 pole post (10) for mounting on a cover plate (21), characterized in that, The device includes a limiting block (11) and a conductive post (12) connected sequentially along a first direction. In the first direction, the orthographic projection of the conductive post (12) is located within the orthographic projection of the limiting block (11). The limiting block (11) has a first surface (111) facing the conductive post (12). A first limiting portion (112) is formed on the first surface (111). The first limiting portion (112) is offset from the conductive post (12). The conductive post (12) is used to extend into the mounting hole (22) of the cover plate (21). The first limiting portion (112) is used to limit and cooperate with a second limiting portion (23) on the cover plate (21).

2. The pole post (10) according to claim 1, characterized in that, The first limiting part (112) is a limiting groove (1121) formed by partially thinning the limiting block (11) and located on the first surface (111).

3. The pole post (10) according to claim 2, characterized in that, The limiting block (11) also has a second surface (113) extending circumferentially along the limiting block (11) and connected to the first surface (111), and the groove of the limiting groove (1121) extends to the second surface (113).

4. The pole post (10) according to claim 3, characterized in that, Along the radial outward direction of the pole post (10), the width of the limiting groove (1121) in the circumferential direction of the limiting block (11) remains unchanged or decreases.

5. The pole post (10) according to claim 2, characterized in that, The number of the limiting grooves (1121) is multiple, and all the limiting grooves (1121) are distributed at intervals along the circumference of the limiting block (11); and / or, In the first direction, the ratio of the depth of the limiting groove (1121) to the thickness of the limiting block (11) is 0.1 to 0.

5.

6. The pole post (10) according to any one of claims 1 to 5, characterized in that, The end of the conductive post (12) away from the limiting block (11) is a welding step (121). Along the radial outward direction of the pole post (10), the welding step (121) has a first step surface (1211) and a second step surface (1212) connected in sequence. The first step surface (1211) extends along the first direction, and the second step surface (1212) extends along a second direction intersecting the first direction.

7. The pole post (10) according to claim 6, characterized in that, In the first direction, the height of the first step surface (1211) is greater than or equal to 0.6 mm, and / or, in the second direction, the width of one side of the second step surface (1212) is greater than or equal to 0.5 mm.

8. The pole post (10) according to any one of claims 1 to 5, characterized in that, The electrode post (10) is a composite electrode post, which includes a first metal part (101) and a second metal part (102) integrally formed. The first metal part (101) and the second metal part (102) are sequentially distributed in the first direction and jointly define the limiting block (11) and the conductive post (12). The second metal part (102) is used to connect with the electrode assembly (32).

9. The pole post (10) according to claim 8, characterized in that, On the outer surface of the composite pole, the dividing line (103) between the first metal part (101) and the second metal part (102) is located on the limiting block (11); and / or, inside the composite pole, the mating surface (104) between the first metal part (101) and the second metal part (102) is a curved surface; and / or, the composite pole is a cold-forged part.

10. A top cover assembly (20), characterized in that, Includes a cover plate (21) and a pole post (10) as described in any one of claims 1 to 9. The cover plate (21) has a mounting hole (22) and the conductive pole post (12) passes through the mounting hole (22). The surface of the cover plate (21) is also provided with a second limiting part (23). The limiting block (11) is supported on the surface of the cover plate (21) and the second limiting part (23) is limited and engaged with the first limiting part (112).

11. The top cover assembly (20) according to claim 10, characterized in that, The second limiting part (23) is a protrusion protruding on the cover plate (21).

12. A battery cell (30), characterized in that, The device includes a housing (31), an electrode assembly (32), and a top cover assembly (20) as described in claim 10 or 11, the top cover assembly (20) covering the housing (31) and defining a receiving cavity (33) therein, the electrode assembly (32) being disposed within the receiving cavity (33), and the electrode post (10) being connected to the electrode assembly (32).

13. A battery (40), characterized in that, Includes the battery cell (30) as described in claim 12.

14. An electrical device (50), characterized in that, Includes the battery cell (30) as described in claim 12 or the battery (40) as described in claim 13.

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