A pole assembly, a cover plate assembly and a battery

Abstract

The utility model provides a kind of pole assembly, cover plate assembly and battery, cover plate assembly includes pole assembly, lower plastic and cover plate body, pole assembly is connected in pole lug, lower plastic and cover plate body are connected in pole assembly, pole assembly includes pole body, sealing element, pole lower plastic, welding ring and upper plastic, pole body is welded in pole lug by bottom plate, sealing element and pole lower plastic are connected in pole bottom plate, welding ring is pressed above sealing element and pole lower plastic, pole body, sealing element and welding ring are connected to form annular injection molding space, upper plastic is formed in annular injection molding space, pole body, sealing element, pole lower plastic and welding ring are placed as insert in injection mold after being connected, upper plastic is obtained by injection molding integrated in annular injection molding space, the number of parts of plastic part is reduced by injection molding process, assembly process is reduced, assembly efficiency is improved, and the structure of integrated pole assembly also improves the sealing and reliability.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to an electrode assembly, a cover plate assembly, and a battery. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage industries, the design requirements for top cover components of secondary batteries are increasing. Traditional battery top covers mostly adopt a split pole structure, and the height of the tabs is difficult to compress, resulting in limited cell space utilization. There are also problems such as a large number of parts and complex assembly processes. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a terminal post assembly, a cover plate assembly, and a battery. By using an integrated molded plastic part, the number of parts is reduced and the material cost is lowered while meeting the installation and positioning requirements and ensuring sealing performance. At the same time, the terminal post assembly is highly integrated, reducing assembly steps, thereby improving the overall performance and mass production economy of the battery module.

[0004] To achieve the above and other related objectives, this utility model provides an electrode post assembly, the electrode post assembly comprising:

[0005] The electrode body has a base plate at its bottom for connecting to the electrode tab.

[0006] A sealing element is disposed on the base plate of the pole post and arranged around the pole post body;

[0007] Plastic material under the electrode post is disposed on the base plate of the electrode post and arranged around the seal;

[0008] A welding ring is arranged around the electrode body and pressed against the seal and the lower plastic of the electrode, wherein the electrode body, the seal and the welding ring form an annular injection molding space;

[0009] The upper plastic is formed within the annular injection space to assemble the pole body, the seal, the lower plastic of the pole, and the welding ring into an integral structure.

[0010] In an optional embodiment of the present invention, the middle part of the pole body is recessed radially inward to form a first annular groove, and a first annular protrusion is formed on the upper plastic by the first annular groove, the first annular protrusion protruding into the first annular groove and engaging with it.

[0011] In an optional embodiment of the present invention, the surface of the first annular groove is provided with a plurality of circumferential grooves.

[0012] In an optional embodiment of this utility model, the pole body includes a first end face away from the pole base plate, the outer edge of the first end face is recessed towards the pole base plate to form an annular step portion, the annular step portion includes a second end face, the second end face is flush with or lower than the end face of the upper plastic.

[0013] In an optional embodiment of this utility model, a first positioning structure is further provided on the side of the lower plastic of the pole post that is in contact with the base plate of the pole post. The first positioning structure is arranged at both ends of the base plate of the pole post along the length direction of the lower plastic of the pole post. The first positioning structure includes a first positioning part and a first mating groove, and the first positioning part is embedded in the first mating groove.

[0014] The first positioning part is disposed on the plastic under the pole post, and the first mating groove is disposed on the bottom plate of the pole post, or the first positioning part is disposed on the bottom plate of the pole post, and the first mating groove is disposed on the plastic under the pole post.

[0015] The present invention also proposes a cover plate assembly, including an electrode post assembly as described in any of the above embodiments, and a lower plastic, wherein the lower plastic is arranged around the lower plastic of the electrode post;

[0016] A second positioning structure is provided at the connection between the lower plastic of the pole post and the lower plastic, and the second positioning structure is arranged along the circumference of the lower plastic of the pole post.

[0017] In an optional embodiment of the present invention, the second positioning structure includes a second positioning part and a second mating groove, wherein the second positioning part is embedded in the second mating groove;

[0018] The second positioning part is disposed on the lower plastic of the pole post, and the second mating groove is disposed on the lower plastic, or the second positioning part is disposed on the lower plastic, and the second mating groove is disposed on the lower plastic of the pole post.

[0019] In an optional embodiment of this utility model, a cover plate body is further included, which is connected to one side of the lower plastic and arranged around the welding ring;

[0020] The cover plate body has an inclined surface on the side where it connects to the welding ring. The inclined surface is inclined towards the welding ring, and the angle between the inclined surface and the bottom surface of the cover plate body is an obtuse angle.

[0021] In an optional embodiment of this utility model, a second annular protrusion is formed on the outer peripheral surface of the welding ring near the plastic under the pole post, and a second annular groove is formed on the side of the cover plate body near the plastic under the pole post, which is correspondingly recessed in the radial direction. The second annular protrusion and the second annular groove cooperate to connect the cover plate body to the welding ring.

[0022] This utility model also proposes a battery, including a cover assembly as described in any of the above embodiments.

[0023] The technical advantage of this utility model lies in the fact that by pre-assembling the electrode body, sealing component, lower plastic of the electrode, and welding ring to form an annular injection space, and then integrally injection molding the upper plastic in the space, the electrode body, sealing component, lower plastic of the electrode, and welding ring are combined into a whole structure in one go, achieving a high degree of integration of functions such as conductivity, sealing, plastic support, and welding interface. At the same time, it simplifies the production process, reduces the number of parts, lowers material and assembly costs, and improves production efficiency and product consistency.

[0024] In the annular injection space structure, the seal and the plastic under the pole are set on the pole base plate. The seal is arranged around the pole base plate, and the plastic under the pole is arranged around the seal. The welding ring is pressed onto the seal and the plastic under the pole to form an assembly positioning, ensuring that the relative positions of each component are stable during injection molding and preventing displacement under injection pressure. During the injection molding process, the seal, pole body, and welding ring together form the inner boundary of the sealed annular injection space, ensuring that the upper plastic can accurately fill the predetermined cavity, providing a precise mold cavity for the injection of molten plastic.

[0025] After the plastic completely fills the sealed injection cavity, it tightly wraps each insert, solving the problem of interface gaps caused by the assembly of split plastic parts and significantly improving the overall sealing reliability of the pole assembly.

[0026] After the plastic injection molding is completed and cured, a "structural adhesive" effect is formed, which makes the components firmly interlocked axially and radially, improving the overall connection strength and rigidity of the components, as well as their vibration and impact resistance, and enhancing structural stability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional schematic diagram of the overall structure of the cover plate assembly in an optional embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the overall structure of the cover plate assembly in an optional embodiment of the present invention;

[0030] Figure 3This is a schematic diagram of the structure of the pole body in an optional embodiment of the present invention;

[0031] Figure 4 This is a cross-sectional schematic diagram of the pole body in an optional embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view of the connection structure between the pole body, the seal, and the plastic under the pole in an optional embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the connection structure of the injection-molded front pole assembly in an optional embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the connection structure between the injection molding front pole assembly and the injection mold in an optional embodiment of this utility model;

[0035] Figure 8 This is a partial structural enlarged view of the pole assembly and injection mold in an optional embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the structure of the pole assembly and the injection mold during the injection molding process in an optional embodiment of this utility model;

[0037] Figure 10 This is a cross-sectional view of the overall structure of the electrode assembly after injection molding in an optional embodiment of this utility model;

[0038] Figure 11 This is a schematic diagram of the structure of the plastic under the pole post and the pole post base plate in an optional embodiment of this utility model;

[0039] Figure 12 This is a schematic diagram of the connection structure between the lower plastic and the lower plastic in an optional embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the structure of the plastic under the pole post in an optional embodiment of this utility model;

[0041] Figure 14 This is a schematic diagram of the lower plastic structure in an optional embodiment of the present invention;

[0042] Figure 15 This is a cross-sectional view of the connection structure between the lower plastic and the lower plastic in an optional embodiment of the present invention;

[0043] Figure 16 This is a partial structural diagram of the assembly of the cover plate body and the welding ring in an optional embodiment of the present invention;

[0044] Figure 17This is a partial structural diagram of the assembly of the cover plate body and the welding ring in another optional embodiment of the present invention;

[0045] Figure 18 This is a partial structural cross-sectional view of the cover plate assembly in an optional embodiment of the present invention.

[0046] Label Explanation:

[0047] 100. Pole post assembly; 200. Upper mold; 300. Lower mold; 400. Lower plastic; 500. Cover plate body; 600. Second positioning structure;

[0048] 110. Terminal body; 120. Seal; 130. Lower plastic of terminal; 140. Welding ring; 150. Annular injection space; 160. Upper plastic; 170. First positioning structure;

[0049] 111. Base plate of pole post; 112. First annular groove; 113. First end face; 114. Second end face; 1121. Roll groove;

[0050] 141. Second annular protrusion; 171. First positioning part; 172. First mating groove;

[0051] 510, Inclined surface; 520, Second annular groove; 610, Second positioning part; 620, Second mating groove. Detailed Implementation

[0052] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0054] Independent small pole type top covers play a significant role in reducing pole height, improving space utilization, and simplifying assembly processes. Independent poles integrate functions such as conductivity, sealing, and mechanical support into integrated components through structural integration. They are key components for realizing electrical connections between cells or modules and energy transmission with external systems. Their safety and reliability are of paramount importance. To ensure operational safety, prevent short circuits, and meet high-voltage insulation requirements, it is usually necessary to cover the metal pole with plastic parts. In existing top covers, the plastic parts generally adopt a split plastic structure. Independent plastic parts are manufactured and then assembled and fixed, which not only increases material costs but also adds more assembly processes and is prone to generating assembly gaps, thus affecting sealing reliability.

[0055] Please see Figures 1 to 18 This utility model proposes an electrode assembly. The electrode assembly 100 includes an electrode body 110, a sealing element 120, a lower plastic part 130, and a welding ring 140. The electrode body 110, the sealing element 120, and the welding ring 140 are connected to form an annular injection space 150. An upper plastic part 160 is integrally formed in the annular injection space 150 through an injection molding process. The electrode body 110, the sealing element 120, the lower plastic part 130, and the welding ring 140 are combined into a single and firm structure in one go, achieving a high degree of integration of functions such as conductivity, sealing, plastic support, and welding interface. This improves the reliability of the seal, reduces cumbersome assembly procedures, simplifies the production process, reduces the number of parts, lowers material and assembly costs, and improves production efficiency and product consistency.

[0056] Please see Figures 1 to 10 In an optional embodiment of this utility model, the bottom of the electrode body 110 is provided with an electrode base plate 111 for connecting the electrode tab; the sealing element 120 and the lower electrode plastic 130 are disposed on the electrode base plate 111, the sealing element 120 is arranged around the electrode body 110, the lower electrode plastic 130 is arranged around the sealing element 120, and the welding ring 140 is arranged around the electrode body 110 and pressed on the sealing element 120 and the lower electrode plastic 130, and is positioned by cooperating with the lower electrode plastic 130 to ensure that during injection molding... The positions of each component are relatively stable to prevent displacement under injection pressure. The lower plastic 130 of the pole post, the pole post body 110, the seal 120 and the welding ring 140 form an annular injection space 150 to ensure that the upper plastic 160 can accurately fill the predetermined cavity, providing a precise mold cavity for the injection of molten plastic. The upper plastic 160 is formed in the annular injection space 150 so that the pole post body 110, the seal 120, the lower plastic 130 of the pole post and the welding ring 140 are assembled into an integrated structure to achieve a firm bond.

[0057] Please see Figures 3 to 10In an optional embodiment of this utility model, the middle part of the electrode body 110 is recessed radially inward to form a first annular groove 112. During injection molding, the molten plastic fills the first annular groove 112, and the first annular groove 112 defines the corresponding first annular protrusion on the upper plastic 160. After curing, the first annular protrusion protrudes into the first annular groove 112 and connects with it. The first annular protrusion is embedded in the first annular groove 112 to form an interlocking structure, which significantly improves the axial bonding strength and pull-out resistance of the upper plastic 160 and the electrode body 110, avoids axial separation or pull-out, and improves the stability of the structure.

[0058] Please see Figures 3 to 10 In an optional embodiment of this utility model, the surface of the first annular groove 112 is provided with a plurality of circumferential grooves 1121. When the upper plastic 160 is processed, the plastic is injection molded into the circumferential grooves 1121 to form an interlock. By increasing the contact area and micro-interlocking, the relative circumferential rotation between the electrode post and the upper plastic 160 is prevented, making the combination between the plastic and the electrode post more secure, effectively preventing torsion, and avoiding torsional breakage of the upper plastic 160.

[0059] Please see Figures 3 to 4 In one optional embodiment of this utility model, the groove 1121 is, for example, a vertically oriented groove that is uniformly distributed along the circumference of the pole body 110. This regular distribution avoids localized stress concentration caused by injection molding shrinkage, thus preventing cracking. It is understood that the structure of the groove 1121 is not limited; its shape can be, for example, rectangular, triangular, trapezoidal, or wavy. In other embodiments, spirally or staggered grooves 1121 can also be used to enhance the anti-torsion effect.

[0060] Please see Figures 3 to 10 In an optional embodiment of this utility model, the side of the electrode body 110 facing away from the electrode base plate 111 is a first end face 113. At one end of the electrode body 110, the outer edge of the first end face 113 is recessed towards the electrode base plate 111 to form an annular step portion. The annular step portion also includes a recessed second end face 114, which is flush with or lower than the end face of the upper plastic 160. During the injection molding process, the second end face 114 of the annular step portion provides a press-fit positioning surface for the injection mold. The mold plate is in close contact with the step portion. The mold plate and the electrode assembly 100 are embedded and effectively blocked. The flow path of the molten adhesive is strictly limited to the closed cavity formed by the mold plate, the electrode body 110, the seal 120 and the welding ring 140, preventing the molten adhesive from overflowing along the upper end of the electrode, avoiding injection overflow from contaminating the conductive surface of the electrode, and avoiding the risk of short circuit.

[0061] Please see Figures 1 to 10In an optional embodiment of this utility model, the electrode body 110, sealing element 120, lower plastic part 130, and welding ring 140 are sequentially connected and placed into an injection mold as an insert. The upper mold 200 pressure plate is tightly attached to the second end face 114, forming a mold cavity, i.e., an annular injection space 150, between itself and the electrode body 110, sealing element 120, and welding ring 140. The lower mold 300 is installed below the electrode base plate 111. After the upper and lower molds are fixed, molten plastic is injected into the sealed mold cavity, filling the entire annular injection space 150. During the flow process, the plastic completely fills the sealed cavity and wraps the insert. After cooling, it solidifies to form the upper plastic part 160. After opening the mold and performing necessary processing, the electrode assembly 100 is obtained. The mold structure is simple, the inserts are easy to fit with the mold, and the production efficiency is high. The upper plastic 160 and the pole body 110 are injection molded as a whole, which not only reduces the number of parts, lowers the cost, and simplifies the assembly process, but also solves the problem of interface micro gaps caused by the assembly of split plastic parts, significantly improving the overall sealing reliability of the pole assembly. After the upper plastic is cured, it forms a "structural adhesive" effect, which can make the components firmly interlocked axially and radially, improve the overall connection strength and rigidity of the assembly, as well as its vibration and impact resistance, and enhance the structural stability.

[0062] Please see Figure 11 In an optional embodiment of this utility model, a first positioning structure 170 is provided on the side of the electrode post lower plastic 130 that contacts the electrode post base plate 111. The first positioning structure 170 positions the electrode post lower plastic 130, thereby ensuring a stable connection between the electrode post lower plastic 130, welding ring 140, and other parts and the electrode post body 110. The first positioning structure 170 is arranged at both ends of the electrode post base plate 111 along the length direction of the electrode post lower plastic 130. The electrode post body 110 is welded to the electrode lugs through its two sides along the length direction. That is, the first positioning structure 170 is located on the short side, avoiding the welding area of ​​the electrode post base plate 111, and will not affect the assembly of the electrode post base plate 111 and the electrode lugs. It can be understood that the first positioning structure 170 includes at least two sets to achieve a better positioning effect, while effectively preventing the electrode post lower plastic 130 from twisting and improving assembly efficiency.

[0063] Please see Figure 11In one optional embodiment of this utility model, the first positioning structure 170 includes a first positioning part 171 and a first mating groove 172. The first positioning part 171 is embedded in the first mating groove 172, and the radial positioning of the plastic 130 under the pole post is achieved through the interlocking of the concave and convex parts. At the same time, it can resist torsional torque and prevent the plastic 130 under the pole post from breaking or being damaged due to torsion. In a specific embodiment, the first positioning structure 170 includes four sets, which are respectively disposed at both ends of the two pole posts. It can be understood that the dimension of the first mating groove 172 in the length direction can be slightly larger than the dimension of the first positioning part 171, so as to facilitate the engagement of the first positioning part 171 with the first mating groove 172 and improve assembly efficiency.

[0064] Please see Figure 11 In an optional embodiment of this utility model, a first positioning part 171 is disposed on the lower plastic 130 of the pole post, and a first mating groove 172 is disposed on the base plate 111 of the pole post. The first positioning part 171 is a protrusion structure, which protrudes along the height direction of the lower plastic 130 of the pole post. The cross-section of the protrusion is, for example, rectangular. The protrusion is integrally formed on the lower plastic 130 of the pole post. The groove shape of the first positioning groove matches the shape of the protrusion. During assembly, the protrusion is inserted into the groove along the axial direction. The contact between the side wall of the protrusion and the groove restricts the displacement of the lower plastic 130 of the pole post in the length direction, thereby achieving precise alignment.

[0065] In other embodiments, the first positioning part 171 may also be disposed on the base plate 111 of the pole post, and the first mating groove 172 may be disposed on the lower plastic 130 of the pole post. The groove may be a dovetail groove structure, and the protrusion may have a matching trapezoidal cross section. During assembly, the lower plastic 130 of the pole post is positioned by engaging the groove and the protrusion. It should be noted that the structure of the first positioning part 171 and the first mating groove 172 is not limited. The first mating groove 172 may be a rectangular groove, a dovetail groove, an arc groove, or other structures, and the shape of the first positioning part 171 may match it.

[0066] Please see Figures 1 to 18 This utility model also proposes a cover plate assembly, which includes an electrode post assembly 100, a lower plastic 400, and a cover plate body 500. The electrode post assembly 100 is welded to the electrode lug, and the lower plastic 400 and the cover plate body 500 are connected to the electrode post assembly 100. After the electrode post assembly 100 is assembled as a whole, the lower plastic 400 is fitted with the lower plastic 130 of the electrode post, and the cover plate body 500 is welded to the welding ring 140 to complete the overall assembly of the cover plate assembly. The assembly process is simple and effectively improves production efficiency.

[0067] Please see Figures 12 to 15In an optional embodiment of this utility model, the lower plastic 400 is arranged around the lower plastic 130 of the pole post, and a second positioning structure 600 is provided at the connection between the lower plastic 130 of the pole post and the lower plastic 400. The second positioning structure 600 is arranged along the circumference of the lower plastic 130 of the pole post. For example, the second positioning structure 600 can be evenly distributed at multiple points along the circumference to improve positioning accuracy.

[0068] Please see Figures 12 to 15 In an optional embodiment of this utility model, the second positioning structure 600 includes a second positioning part 610 and a second mating groove 620. The second positioning part 610 is embedded in the second mating groove 620, and the lower plastic 400 is positioned through the interlocking of the concave and convex parts. The cover plate body 500 is connected to the lower plastic 400, thereby achieving the positioning of the cover plate body 500 and ensuring the coaxiality of the cover plate body 500 and the pole post assembly 100, avoiding welding misalignment. It is understood that the size of the second mating groove 620 should be greater than or equal to the size of the second positioning part 610 to achieve the overall assembly of the lower plastic 400 and the lower plastic 130 of the pole post.

[0069] Please see Figures 12 to 15 In an optional embodiment of this utility model, the second positioning part 610 is disposed on the lower plastic 130 of the pole post, and the second mating groove 620 is disposed on the lower plastic 400. The second positioning part 610 is a protrusion structure, which is formed by radially protruding from the edge of the lower plastic 400. The groove shape on the second mating groove 620 matches the protrusion shape. During assembly, the protrusion is inserted into the groove to achieve precise positioning. It is understood that the groove shape can be a rectangular groove, a dovetail groove, an arc groove, or other structures. In other embodiments, the second positioning part 610 can also be disposed on the lower plastic 400, and the second mating groove 620 can be disposed on the lower plastic 130 of the pole post, as long as positioning can be achieved.

[0070] Please see Figures 12 to 15 In an optional embodiment of this utility model, a raised structure is also formed on the bottom surface of the lower plastic 400. After assembly, the tab layer misalignment area is set in the groove space surrounded by the raised structure. Therefore, after the pole post assembly 100 is assembled, there is no need to cut the tab. After the lower plastic 400 is connected to the cover plate body 500, it approaches the pole post assembly 100 along the height direction of the pole post assembly 100 and is assembled with it. During the assembly process, the cover plate body 500 is positioned by the second positioning structure 600 to facilitate welding. The groove space below the lower plastic 400 ensures that it will not conflict with the structure of the tab. After assembly, the tab is located in the groove space. This structure can save the tab cutting process and simplify the assembly process.

[0071] Please see Figures 16 to 18In an optional embodiment of this utility model, the cover plate body 500 is connected to one side of the lower plastic 400 and arranged around the welding ring 140. An inclined surface 510 is provided on the side where the cover plate body 500 is connected to the welding ring 140. The inclined surface 510 is inclined towards the welding ring 140, and the angle between the inclined surface 510 and the bottom surface of the cover plate body 500 is an obtuse angle, which facilitates alignment and assembly. The inclination angle can be adjusted according to the thickness and other dimensions of the welding ring 140 and the assembly requirements.

[0072] Please see Figure 16 In an optional embodiment of this utility model, the connection surface between the cover plate body 500 and the welding ring 140 is an inclined surface 510. The side of the welding ring 140 near the cover plate body 500 is set with an inclined surface structure parallel to it for mating. The cover plate body 500 and the welding ring 140 are connected by a large inclined surface 510. The inclined surface 510 and the bottom surface form an assembly guide angle, reducing the difficulty of alignment, avoiding assembly jamming, and improving assembly efficiency. Moreover, the inclined surface has a longer mating distance than the vertical surface, allowing for a longer welding distance. During assembly, the bottom surface of the cover plate body 500 and the side surface of the lower plastic 400 mate with the lower plastic 130 of the pole post for accurate positioning. It should be noted that the radial dimension W of the upper end face of the welding ring 140 is ≥0.5mm to allow sufficient distance for laser welding.

[0073] Please see Figure 17 In another optional embodiment of this utility model, the connection surface between the cover plate body 500 and the welding ring 140 includes a vertical surface and an inclined surface 510 that are connected to each other. That is, the vertical connection surface and the bottom surface are transitioned by the inclined surface 510. The inclined surface 510 forms an assembly guide angle to facilitate assembly. The distance between the guide angle and the upper end surface of the cover plate body 500, i.e., the height H of the vertical surface, is ≥0.3mm to ensure the welding depth of the laser weld shell. In other embodiments, the cover plate body 500 and the welding ring 140 can also be connected by a vertical surface without the inclined surface 510.

[0074] Please see Figure 18In an optional embodiment of this utility model, a second annular protrusion 141 is formed radially on the outer peripheral surface of the welding ring 140 near the lower plastic 130 of the electrode post, and a corresponding second annular groove 520 is formed radially on the side of the cover plate body 500 near the lower plastic 130 of the electrode post. The second annular protrusion 141 and the second annular groove 520 cooperate to connect the cover plate body 500 to the welding ring 140. The second annular protrusion 141 on the welding ring 140 and its upper end face form a stepped structure. The matching steps facilitate the positioning of the cover plate body 500, making the welding surfaces of the cover plate body 500 and the welding ring 140 stable on the same plane, preventing misalignment and facilitating welding. At the same time, the misalignment distribution of the stepped surface can effectively prevent laser leakage, prevent welding slag from falling into the battery cell, ensure welding quality, and the stepped surface assembly structure can withstand axial force, avoid local stress concentration, and improve structural stability and connection strength. Understandably, the dimensions of the second annular protrusion 141 and the second annular groove 520 need to be determined based on the structural dimensions of the welding ring 140 and the cover plate body 500, so as to achieve positioning and assembly while ensuring stable welding quality.

[0075] Please see Figure 18 In an optional embodiment of this utility model, chamfers are formed at both ends of the second annular groove 520 by transitioning through inclined surfaces 510, which reduces local stress concentration and can also be used as assembly guide angles to reduce the risk of jamming or misalignment, making it easier to assemble the cover plate body 500 and improving assembly efficiency.

[0076] Please see Figures 1 to 18 In an optional embodiment of this utility model, after the electrode assembly 100 is injection molded, it is welded to the electrode ear through the electrode base plate 111. The lower plastic 400 moves closer to the electrode assembly 100 along the height direction and is connected to it through the second positioning structure 600. Then, the cover plate body 500 is welded to the welding ring 140. The assembly process is simple and efficient.

[0077] Please see Figures 1 to 18 The present invention also proposes a battery, including a cover plate assembly as described in any of the above embodiments, as well as a battery cell and a housing. The cover plate assembly is welded to the electrode tabs of the battery cell via a terminal base plate 111. The battery cell is placed inside the housing. The housing is sealed by welding the cover plate body 500 on the cover plate assembly to the housing, thereby completing the battery assembly.

[0078] In summary, this utility model reduces the number of parts and simplifies the assembly process by using an injection-molded upper plastic 160. The integrated structure ensures the overall stability and sealing of the pole assembly 100. The first annular groove 112 and the roller groove 1121 enhance axial tensile strength and torsional resistance, ensuring stable connection. Multiple positioning structures and guide angle design ensure accurate positioning and improve assembly efficiency. When assembling the lower plastic 400 with the lower plastic 130 of the pole, a tab-accommodating area is provided, eliminating the need for tab cutting and further improving overall assembly efficiency. The special mating structure between the cover plate body 500 and the welding ring 140 achieves positioning while ensuring welding quality. The cover plate assembly structure of this utility model effectively simplifies the assembly process and improves mass production efficiency.

[0079] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0080] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0081] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0082] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0083] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0084] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0085] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0086] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0087] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A pole assembly, characterized in that, The pole assembly includes: The electrode body has a base plate at its bottom for connecting to the electrode tab. A sealing element is disposed on the base plate of the pole post and arranged around the pole post body; Plastic material under the electrode post is disposed on the base plate of the electrode post and arranged around the seal; A welding ring is arranged around the electrode body and pressed against the seal and the lower plastic of the electrode, wherein the electrode body, the seal and the welding ring form an annular injection molding space; The upper plastic is formed within the annular injection space to assemble the pole body, the seal, the lower plastic of the pole, and the welding ring into an integral structure.

2. The pole assembly according to claim 1, characterized in that, The center of the pole body is recessed radially inward to form a first annular groove, and a first annular protrusion is formed on the upper plastic by the first annular groove. The first annular protrusion extends into the first annular groove and engages with it.

3. The pole assembly according to claim 2, characterized in that, The surface of the first annular groove has multiple circumferentially distributed grooves.

4. The pole assembly according to claim 1, characterized in that, The pole body includes a first end face away from the pole base plate. The outer edge of the first end face is recessed towards the pole base plate to form an annular step portion. The annular step portion includes a second end face. The second end face is flush with or lower than the end face of the upper plastic.

5. The pole assembly according to claim 1, characterized in that, The side of the lower plastic of the pole post that contacts the pole post base plate is also provided with a first positioning structure. The first positioning structure is arranged at both ends of the pole post base plate along the length direction of the lower plastic of the pole post. The first positioning structure includes a first positioning part and a first mating groove. The first positioning part is embedded in the first mating groove. The first positioning part is disposed on the plastic under the pole post, and the first mating groove is disposed on the bottom plate of the pole post, or the first positioning part is disposed on the bottom plate of the pole post, and the first mating groove is disposed on the plastic under the pole post.

6. A cover plate assembly, characterized in that, The device includes an electrode assembly as described in any one of claims 1 to 5, and a lower plastic material arranged around the lower plastic material of the electrode assembly; A second positioning structure is provided at the connection between the lower plastic of the pole post and the lower plastic, and the second positioning structure is arranged along the circumference of the lower plastic of the pole post.

7. The cover plate assembly according to claim 6, characterized in that, The second positioning structure includes a second positioning part and a second mating groove, wherein the second positioning part is embedded in the second mating groove; The second positioning part is disposed on the lower plastic of the pole post, and the second mating groove is disposed on the lower plastic, or the second positioning part is disposed on the lower plastic, and the second mating groove is disposed on the lower plastic of the pole post.

8. The cover plate assembly according to claim 6, characterized in that, It also includes a cover plate body, which is connected to one side of the lower plastic and arranged around the welding ring; The cover plate body has an inclined surface on the side where it connects to the welding ring. The inclined surface is inclined towards the welding ring, and the angle between the inclined surface and the bottom surface of the cover plate body is an obtuse angle.

9. The cover plate assembly according to claim 8, characterized in that, The outer circumferential surface of the welding ring extends radially to form a second annular protrusion near the plastic under the pole post, and the cover plate body is correspondingly recessed radially to form a second annular groove on the side near the plastic under the pole post. The second annular protrusion and the second annular groove cooperate to connect the cover plate body to the welding ring.

10. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 6 to 9.

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