Top cover assembly and battery

Abstract

The utility model provides a kind of top cover assembly and battery, the top cover assembly includes pole, connecting piece and covering body, connecting piece is used to be welded with the pole and form welding area;Covering body is used to cover and adhere to the welding area;Wherein, at least one of the pole and the connecting piece is provided with buckling structure, the buckling structure is configured to form physical anchoring with the covering body after the covering body covers and adheres to the welding area, covering body covers welding area by covering body, and make covering body and connecting piece and / or pole between form physical anchoring, it is favorable to form stable covering structure on the surface of welding area after welding is completed, to block the metal particles generated in welding area into battery interior, reduce the risk that diaphragm is punctured or forms conductive bridge between positive and negative pole, reduce the possibility of thus caused local micro short circuit.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly and a battery. Background Technology

[0002] With the widespread application of new energy technologies, batteries, as the core component for energy storage and output, typically include basic structures such as a positive electrode, a negative electrode, a separator, and an electrolyte. To enable power transmission in the external circuit, connecting tabs are usually installed on the outside of the battery, and these tabs are connected to the terminals by welding to form a current path.

[0003] However, in practical applications, batteries using this technology may experience punctures in the separator, leading to localized short circuits, which could affect the battery's electrochemical stability and lifespan. Utility Model Content

[0004] The present invention provides a top cover assembly and a battery that can reduce the risk of the separator being punctured and help improve the electrochemical stability and service life of the battery.

[0005] In a first aspect, embodiments of the present invention provide a top cover assembly, comprising: pole; Connector for welding to the pole post to form a welding area; A cover for covering and fitting the welding area; Wherein, at least one of the pole and the connector is provided with a fastening structure, the fastening structure being configured to form a physical anchor with the cover after the cover covers and adheres to the welding area.

[0006] By adopting the above technical solution, the cover can cover the welding area, thereby preventing metal particles generated in the welding area from entering the battery, reducing the risk of the separator being punctured or forming a conductive bridge between the positive and negative electrodes, and reducing the possibility of causing local micro-short circuits.

[0007] In some embodiments, the physical anchoring includes: the cover being embedded in a mechanical interlock formed by the fastening structure.

[0008] By adopting the above technical solution, the cover can form a mechanical interlock with the fastening structure, which helps to improve the structural stability of the cover during long-term use, reduce the risk of it falling off, and thus maintain reliable coverage of the welding area.

[0009] In some embodiments, the cover comprises hot melt adhesive.

[0010] By adopting the above technical solution, the hot melt adhesive is in a fluid state at the initial stage of application, which can penetrate into the internal space of the interlocking structure. After curing, it forms a stable physical anchoring relationship with the interlocking structure, which helps to improve the installation efficiency of the cover and enhance its coverage stability of the welding area.

[0011] In some embodiments, the connector includes a blocking portion that forms the fastening structure, the blocking portion having a through hole, the pole having a groove, and the through hole communicating with the groove; In the projection onto a first plane perpendicular to the central axis of the through hole, the projected area of ​​the through hole is smaller than the projected area of ​​the groove; The groove is filled with the cover, which extends from the groove through the through hole to at least cover the welding area.

[0012] By adopting the above technical solution, since the projected area of ​​the groove on the first plane is larger than the projected area of ​​the through hole, the through hole and the groove together form a fitting structure with a larger internal volume and a smaller opening. When the cover is embedded into the groove through the through hole, it is beneficial to achieve a secure fit between the cover and the pole and connector, thereby forming a stable connection. To a certain extent, this helps to improve the holding force of the cover during later use and reduce the risk of it falling off.

[0013] In some embodiments, the through hole is coaxial with and communicates with the groove.

[0014] By adopting the above technical solution, the through hole and the groove are coaxial, which helps to enhance the fixing effect of the cover, thereby making the fixing force on the cover more stable. This is beneficial for the cover to achieve a tighter fit and coverage of the welding area, thereby reducing the possibility of metal particles generated in the welding area entering the battery.

[0015] In some embodiments, the projection area of ​​the welding area on the first plane is located outside the projection area of ​​the groove on the first plane.

[0016] By adopting the above technical solution, the welding position of the pole and the connecting piece is set on the outer periphery of the groove, which helps to avoid damaging the space between the groove and the connecting piece during the welding process, thereby reserving sufficient space for the subsequent injection and distribution of the liquid-cured adhesive.

[0017] In some embodiments, the projection area of ​​the welding area on the first plane surrounds the projection area of ​​the groove on the first plane.

[0018] By adopting the above technical solution, the electrode post and the connector are continuously welded, and the welded areas are distributed in a ring. This structure helps to improve the overall strength and reliability of the weld, while also ensuring that the welded area surrounds the groove. When the liquid-cured adhesive enters the groove through the through-hole, the ring-shaped welded area can constrain the distribution of the liquid-cured adhesive, limiting it to mainly filling the inside of the groove and preventing the liquid-cured adhesive from overflowing to other areas, thereby avoiding any adverse effects on battery function.

[0019] In some embodiments, the through-hole is a constricted structure with large openings at both ends and a small opening in the middle; or, The through-hole is a tapered structure with a large opening at one end and a small opening at the other end; or... The through hole is a columnar structure with the same opening size at both ends.

[0020] By adopting the above technical solutions, through holes of different shapes can help achieve differentiated fixing effects, thereby enhancing the adaptability and stability of the cover in terms of structure and helping to improve the fixing reliability of the cover in the welding area.

[0021] In some embodiments, the connector includes a first region and a second region, the first region being used to connect with the pole post, the second region being used to connect with the tab, and the through hole being disposed in the first region.

[0022] By adopting the above technical solution, the structural function of the connector is divided into different areas, which facilitates targeted welding operations between the connector and the pole post and the pole lug, thereby improving the convenience and accuracy of welding, and to a certain extent avoiding interference with other components during the welding process.

[0023] In some embodiments, the through hole is a circular hole.

[0024] By adopting the above technical solution, the inner wall of the circular through hole has no sharp edges, which helps to reduce stress concentration when the cover is embedded in the through hole and reduces the risk of mechanical damage to the cover. At the same time, the circular structure is simpler to process and helps to improve manufacturing efficiency and consistency.

[0025] In some embodiments, the groove is a circular groove.

[0026] By adopting the above technical solutions, the circular groove structure is relatively simple, the processing technology is mature, and it is beneficial to improve processing efficiency and consistency.

[0027] Secondly, embodiments of this utility model provide a battery including the top cover assembly described in the above technical solution.

[0028] By adopting the above technical solution, the cover can effectively cover the welding area between the connector and the terminal post, which helps to prevent metal particles generated during the welding process from entering the battery, thereby reducing the adverse effects on the internal structure of the battery and improving the structural reliability and safety of the battery.

[0029] The beneficial effects of the embodiments of this utility model are as follows: In the embodiments of this utility model, by covering the welding area with a cover and forming a physical anchor between the cover and the connector and / or the pole, it is beneficial to form a stable cover structure on the surface of the welding area after welding is completed, thereby preventing metal particles generated in the welding area from entering the battery, reducing the risk of the separator being punctured or forming a conductive bridge between the positive and negative electrodes, and reducing the possibility of causing a local micro short circuit.

[0030] Furthermore, the physical anchoring formed by the mechanical interlock between the cover and the fastening structure helps to improve the structural stability of the cover during long-term use, reduce the risk of it falling off, and thus maintain reliable protection for the welded area. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the 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.

[0032] Figure 1 This is a schematic diagram of the connecting piece provided in an embodiment of this utility model; Figure 2 This is a top view of the top cover assembly provided in an embodiment of the present utility model; Figure 3 This is a perspective view of the top cover assembly provided in an embodiment of the present utility model; Figure 4 This is an exploded view of the top cover assembly provided in an embodiment of this utility model; Figure 5 This is a partial cross-sectional view of the top cover assembly provided in an embodiment of this utility model.

[0033] Explanation of reference numerals in the attached figures: 100. Connector; 110. Snap-fit ​​structure; 111. Through hole; 120. Welding area; 130. First area; 140. Second area; 150. Blocking part; 200. Pole post; 210. Groove; 300. Cover. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] Firstly, referring to Figures 1 to 5 This utility model provides a top cover assembly that forms part of a battery. Exemplarily, the battery also includes a separator and tabs. In some embodiments, the top cover assembly includes a terminal post 200, a connector 100, and a cover. The terminal post 200 and the tabs are respectively connected to the connector 100 by welding. The cover 300 is used to cover and fit against the welding area 120.

[0036] The connector 100 is used to connect the electrical connection structure located outside the battery to the electrode structure inside the battery, thereby achieving current conduction in the structure and providing an intermediate connection path between the terminal 200 and the tab. The connector 100 can be made of metal material, with good conductivity and weldability, and its shape can be a sheet structure to form a surface contact with the terminal 200, improving welding stability.

[0037] It is understandable that after the terminal 200 is welded to the connector 100, metal particles may be generated at the welded part during use. These metal particles pose a risk of entering the battery and potentially puncturing the separator, causing a local micro-short circuit, which will adversely affect the electrochemical stability and lifespan of the battery.

[0038] The cover 300 provided by this invention can suppress the aforementioned problems to a certain extent. The cover 300 adheres to and covers the welding area 120 between the terminal post 200 and the connector 100, thereby forming a barrier layer in the structure. On the one hand, this cover structure helps reduce the probability of metal particles being generated in the welding area 120; on the other hand, even if metal particles are generated in the welding area 120, the cover 300 can still provide spatial restraint, causing the particles to remain between the cover 300 and the connector 100, preventing them from further entering the battery interior. This helps improve the sealing performance and reliability of the battery structure, and enhances the stability and lifespan of the battery.

[0039] In some embodiments, the cover 300 is made of an insulating material and is used to cover and adhere to the welding area 120 formed by the electrode 200 and the connector 100, so as to structurally cover and block the welding part. Exemplarily, the cover 300 can be made of hot melt adhesive material, which is applied directly to the welding area 120 by dispensing. During the application process, the hot melt adhesive is in a molten state and has good fluidity, capable of covering all parts of the weld joint; after cooling and solidification, the hot melt adhesive forms a shaped solid cover structure, adhering between the connector 100 and the electrode 200, thereby forming a relatively stable encapsulation effect.

[0040] On the one hand, the hot melt adhesive, as a cover 300, can form a physical barrier for the welding area 120, inhibiting the diffusion of metal particles from the welding area 120 into the battery; on the other hand, the hot melt adhesive material itself is flexible and insulating, and can adapt to irregular undulations on the welding surface, which is beneficial to improving bonding stability and electrical isolation performance.

[0041] In other embodiments, the cover 300 is a prefabricated structural component. The cover 300 may be made of plastic, rubber, or other insulating materials and is provided with a connection structure for fixation, such as a snap-fit ​​structure and / or a surface adhesive layer. The term "snap-fit ​​structure" refers to a portion of the cover 300 that has protrusions, snaps, slots, etc., that can mate with the surface structure of the pole 200 or connector 100, allowing the cover 300 to be positioned and fixed through mechanical engagement during installation. This structure simplifies the assembly process and improves the holding force of the cover 300.

[0042] Furthermore, the specific form and installation method of the "cover 300" are not limited to the above examples. Its key function is to provide surface coverage for the welding area 120 and to have a certain degree of adhesion or mechanical connection capability, thereby restricting and constraining metal particles during subsequent use.

[0043] In some embodiments, at least one of the pole post 200 and the connector 100 is provided with a fastening structure 110, which is configured to physically anchor the cover 300 after the cover 300 covers and adheres to the welding area 120, thereby enhancing the structural retention capability of the cover 300.

[0044] For example, the fastening structure 110 may include a snap-fit, a protrusion, or other structural units that can physically engage with the cover 300, such as fitting, filling, or locking. Taking a snap-fit ​​as an example, when the cover 300 is a liquid-curing material (such as hot melt adhesive or epoxy resin), it is fluid when uncured and can penetrate into the through-holes or grooves formed by the snap-fit. After curing, the cover 300 and the snap-fit ​​form a mechanically limiting structure, constituting a physical anchoring method similar to "riveting." For instance, when the cover 300 is a prefabricated structural component, its lower surface can be designed to match the shape of the fastening structure 110. When it is installed, it can engage with the fastening structure 110, thereby improving the installation stability of the cover 300.

[0045] The fastening structure 110 establishes a tighter bond between the cover 300 and the connector 100 and / or the terminal post 200, which can suppress loosening or displacement of the cover 300 during subsequent use and help maintain the complete shielding of the welding area 120 by the cover structure. Especially during battery manufacturing and use, there may be temperature changes, vibrations, or electrochemical environmental disturbances. If the cover 300 relies solely on surface adhesion, its stability may be insufficient. Introducing a physical anchoring structure helps to improve the reliability of the overall connection.

[0046] It should be understood that the "fastening structure 110" described in this application is not limited to a specific form. Its key feature is that it can form a mechanical fit or filling and fixing relationship with the cover 300 in terms of structure, so as to realize the function of the cover 300 in maintaining and supporting the welding area 120. According to the design requirements and processing conditions of the actual product, inverted fastening, protruding structure and elastic snap-fit ​​structure can be flexibly selected to achieve this.

[0047] By providing a snap-fit ​​structure 110 in the terminal post 200 and / or connector 100 and making the cover 300 physically anchored to it, the coverage effect of the cover 300 on the welding area 120 is enhanced, and its structural stability during long-term use is improved. This reduces the risk of metal particles escaping during the welding process to a certain extent, and improves the structural safety and service life of the battery.

[0048] In some embodiments, refer to Figure 4 , Figure 5 Physical anchoring includes: mechanical interlocking formed by the embedding of the cover 300 into the fastening structure 110. Mechanical interlocking means that after the cover 300 is cured or installed, there is a shape fit or position restriction between its material structure and the fastening structure 110, making it difficult for the cover 300 to relatively disengage in the axial or radial direction.

[0049] The mechanical interlock helps improve the positioning stability of the cover 300 during long-term use. Especially during the battery's service life, various external disturbances such as temperature fluctuations, mechanical vibrations, and electrochemical corrosion may exist. If the cover 300 relies solely on initial adhesion, its stability may be insufficient. However, the mechanical interlock between the cover 300 and the fastening structure 110 enhances its resistance to displacement and reduces the risk of loosening due to external forces or environmental changes.

[0050] It is important to understand that "mechanical interlocking" is not limited to a specific shape of interlocking structure. Its core lies in the structural cooperation between the cover 300 and the fastening structure 110, which effectively restricts the relative movement of the cover 300 in at least one direction. Depending on the product design and process requirements, the fastening structure 110 can take the form of an inverted or protruding structure, and the cover 300 can also be a liquid-cured body, a prefabricated cover sheet, or a structural adhesive with local expansion properties. The specific structure can be flexibly selected according to the actual situation.

[0051] In some embodiments, the cover 300 includes hot melt adhesive.

[0052] Specifically, the liquid-curing adhesive is in a fluid state before curing, which facilitates bonding and adhesion to the welding area 120. While covering the welding area 120, the liquid-curing adhesive can partially penetrate into the internal space of the interlocking structure 110. After filling these structures, the hot melt adhesive cures, forming a structural morphology fit, thereby establishing a physical anchoring relationship between the structure and the interlocking structure 110.

[0053] This physical anchoring relationship is a mechanical fit structure, specifically manifested in that the cured cover 300 has restricted movement in at least one direction: axial, radial, or rotational. Through this anchoring method, the cover 300 is less likely to detach or shift due to environmental disturbances (such as thermal expansion and contraction, mechanical vibration, etc.), which is beneficial for maintaining effective coverage of the welded area 120 over a longer period.

[0054] During the initial application stage of the cover 300, the liquid-cured adhesive has a certain fluidity, which allows it to quickly fill the cavity space provided by the fastening structure 110. Therefore, preliminary positioning can be achieved without a complex mechanical assembly process, which helps to improve the installation efficiency of the cover 300 and simplify the battery encapsulation process. At the same time, after curing, the cover structure forms an integral encapsulation shape, which effectively shields the welding area 120, thereby preventing metal particles that may be generated during the welding process from entering the battery.

[0055] Therefore, by applying a liquid-cured adhesive to the welding area 120 and utilizing its fluidity and cooperation with the fastening structure 110 to form a mechanical fit, it is not only beneficial to improve the structural stability of the cover 300, but also to enhance its adhesion and fixation effect on the welding area 120, thus providing structural protection for the safety and stability of the battery.

[0056] In some embodiments, refer to Figure 1 , Figure 5 The connector 100 includes a blocking portion 150, which forms a fastening structure 110. The blocking portion 150 is provided with a through hole 111, and the pole post 200 is provided with a groove 210. The through hole 111 communicates with the groove 210. In the projection on a first plane perpendicular to the central axis of the through hole 111, the projected area of ​​the through hole 111 is smaller than the projected area of ​​the groove 210. The groove 210 is filled with a cover 300, which extends from the groove 210 through the through hole 111 to at least cover the welding area 120. This structure makes the through hole 111 and the groove 210 together form a kind of "wide inside and narrow outside" limiting structure in space, that is, the internal volume is relatively large and the opening area is small, thereby forming a fitting area with a certain accommodating depth and expansion space.

[0057] In embodiments where the cover 300 is a liquid-curing adhesive, the cover 300 is in a flowing state at the initial stage of application and can flow into the groove 210 by its own gravity or external force. After the cover 300 fills the groove 210, it extends outward through the through hole 111 and covers the welding area 120. After curing, the portion of the cover 300 in the groove 210 forms a structural interference with the through hole 111, thereby achieving a certain degree of embedded fit in terms of geometry.

[0058] This structural design helps improve the holding force of the cover 300 during its bonding with the pole 200 and connector 100. On the one hand, the larger volume of the groove 210 can accommodate more adhesive material, giving the embedded part higher tensile strength; on the other hand, due to the small opening size of the through hole 111, the local "barb"-like snap-fit ​​structure formed at the connection between the groove 210 and the through hole 111 after the cover 300 has cured can, to a certain extent, limit the displacement or peeling of the cover 300 during use, thereby enhancing its resistance to detachment.

[0059] In embodiments where the cover 300 is a prefabricated structure, an elastic protrusion structure may be provided on the cover 300. This protrusion structure is configured to be embedded into the groove 210 through the through hole 111 during installation. Specifically, the size of the elastic protrusion structure is slightly larger than the diameter of the through hole 111, but smaller than the opening size of the groove 210, so that it undergoes a certain degree of elastic deformation during pressing, thereby passing through the through hole 111 and partially extending into the groove 210.

[0060] Because the internal space of the groove 210 is relatively larger than that of the through hole 111, the elastic protrusion can partially rebound after entering the groove 210, thus forming a holding state below the through hole 111, and thus structurally forming a fixed fit with the groove 210. This fit allows the cover 300 to have a certain holding force in both the axial and radial directions, which helps to improve the positioning accuracy and installation reliability of the cover 300.

[0061] In some embodiments, refer to Figure 2 , Figure 5 The through hole 111 and the groove 210 are coaxial and connected. This coaxial structure design facilitates directional alignment during the filling or embedding of the cover 300, allowing the cover 300 to be smoothly inserted along the central axis of the through hole 111 and the groove 210, avoiding misalignment or interference, thereby improving the consistency and reliability of the assembly.

[0062] When the cover 300 is a liquid-curing adhesive or a prefabricated cover 300 with an embedded structure, the coaxial arrangement allows for more uniform axial force distribution on the cover 300 during curing or rebound bonding, helping to form a stable limiting structure within the through-hole 111 and groove 210. This enhances the adhesion performance of the cover 300 in the welding area 120, thereby improving its coverage continuity and sealing integrity within the welding area 120.

[0063] In some embodiments, refer to Figure 2 , Figure 4 The projection area of ​​the welding area 120 on the first plane is located outside the projection area of ​​the groove 210 on the first plane. The welding position of the pole 200 and the connecting piece is set on the outer periphery of the groove 210, which helps to avoid damaging the space between the groove 210 and the connector 100 during the welding process, thereby reserving sufficient space for the subsequent injection and distribution of the liquid-cured adhesive. Specifically, the welding position of the pole 200 and the connector 100 is set on the outer periphery of the groove 210, so that the welding process does not overlap or interfere with the groove 210 and the communication space between it and the through hole 111.

[0064] By arranging the welding area 120 around the groove 210, it is beneficial to maintain the integrity of the groove 210 area during the welding operation, avoid damage to the groove 210 structure due to heat or material deformation, and thus maintain the effectiveness of the space for subsequent embedding and distribution of the cover 300.

[0065] In addition, the welding area 120 is located outside the groove 210, which can reduce the possibility of molten welding metal or spatter entering the groove 210 to a certain extent, avoid affecting the distribution path and anchoring effect of the cover material 300, and thus help improve the sealing reliability and mechanical stability of the overall structure in long-term use.

[0066] In some embodiments, refer to Figure 2 , Figure 4 The projection area of ​​the welding area 120 on the first plane surrounds the projection area of ​​the groove 210 on the first plane. Specifically, the welding method between the pole post 200 and the connector 100 is continuous welding, and the welding parts are distributed along a ring path, and are arranged in a ring shape around the outside of the groove 210.

[0067] This structural layout helps improve the overall strength and structural stability of the welded connection, especially when subjected to thermal expansion and contraction or external mechanical stress, which can reduce the risk of weld cracking or detachment to a certain extent. At the same time, the welding area 120 is set around the groove 210, so that the groove 210 maintains its structural integrity after welding, providing an independent and restricted filling space for the cover 300 (e.g., liquid-cured adhesive).

[0068] When the liquid-cured adhesive is injected through the through-hole 111 and enters the groove 210, the annular welding area 120 structurally constrains its flow path, guiding the liquid-cured adhesive to mainly accumulate in the groove 210 area and maintain a stable shape during the curing process. This helps prevent the cover 300 from diffusing outwards or overflowing to other structural areas, thereby reducing the possibility of interference or contamination to surrounding functional structures (such as tabs, casing seals, etc.), and contributing to maintaining the integrity and functional stability of the overall battery structure.

[0069] In some embodiments, the through hole 111 may have a variety of shapes, including a constricted structure with larger opening sizes at both ends and a smaller size in the middle; or a tapered structure with a larger opening size at one end and a smaller opening size at the other end; or a columnar structure with the same opening size at both ends.

[0070] The design of through holes 111 with different shapes is beneficial to achieving differentiated fixing effects on the cover 300. Specifically, the shrinking structure through holes 111 may provide a certain limiting effect when the cover 300 is inserted, the tapered structure can achieve gradual clamping through the gradually changing cross-sectional area, and the columnar structure helps to form a uniform support surface.

[0071] The aforementioned diverse through-hole morphology enhances the structural compatibility and stability between the cover 300, the connector 100, and the pole post 200, which is beneficial to improving the fixation reliability of the cover 300 in the welding area 120, thereby helping to maintain the long-term covering effect of the cover 300.

[0072] In some embodiments, refer to Figure 1 , Figure 3 The connector 100 includes a first region 130 and a second region 140. The first region 130 is used to connect with the pole post 200, and the second region 140 is used to connect with the pole lug. A through hole 111 is provided in the first region 130. By dividing the connector 100 into two functional regions, it is beneficial to use appropriate process parameters for different regions during the welding process, thereby achieving a more precise and stable welding effect.

[0073] Specifically, the through-hole 111 structure of the first region 130 can not only cooperate with the groove 210 on the pole post 200 to form a physical fit, but also provide space for the filling of the cover 300, which helps to cover the welding area 120, thereby reducing the risk of metal particles falling off due to welding defects.

[0074] The second region 140, serving as the connection point for current transmission, typically does not have through holes 111 to maintain structural integrity and improve overall conductivity and mechanical strength. Simultaneously, the regional division, to some extent, prevents the spread of the heat-affected zone during welding, reducing potential impact on the tab connection points and contributing to improved overall stability of the battery module.

[0075] It should be noted that the so-called "first region 130" and "second region 140" are not strict structural boundaries, but rather regional ranges divided according to function. The specific size and position can be adjusted according to the actual product design to adapt to the requirements of different battery structures and manufacturing processes.

[0076] In some embodiments, refer to Figure 1 The through hole 111 is a circular hole. The inner wall of the circular through hole 111 has no sharp edges, which helps to reduce stress concentration to a certain extent when the cover 300 is embedded in the through hole 111, and reduces the risk of mechanical damage to the cover 300; at the same time, the circular structure is simpler to process, which helps to improve manufacturing efficiency and product consistency.

[0077] In some embodiments, refer to Figure 4 The groove 210 is a circular groove 210. The circular groove 210 has a relatively simple structure and mature processing technology, which is beneficial to improving processing efficiency and processing consistency.

[0078] Secondly, this utility model provides a battery, including the top cover assembly of the above embodiment. This battery possesses all the beneficial effects of the aforementioned top cover assembly, which will not be elaborated further herein.

[0079] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. 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 utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly, characterized in that, include: pole (200); A connector (100) is used to weld with the pole post (200) to form a welding area (120); Cover (300) for covering and fitting the welding area (120); At least one of the pole post (200) and the connector (100) is provided with a fastening structure (110), which is configured to physically anchor the cover (300) after the cover (300) covers and adheres to the welding area (120).

2. The top cover assembly according to claim 1, characterized in that, The physical anchoring includes a mechanical interlock formed by the cover (300) being embedded in the fastening structure (110).

3. The top cover assembly according to claim 1, characterized in that, The cover (300) includes hot melt adhesive.

4. The top cover assembly according to any one of claims 1 to 3, characterized in that, The connector (100) includes a blocking part (150), which constitutes the fastening structure (110). The blocking part (150) is provided with a through hole (111), and the pole post (200) is provided with a groove (210). The through hole (111) communicates with the groove (210). In the projection onto a first plane perpendicular to the central axis of the through hole (111), the projected area of ​​the through hole (111) is smaller than the projected area of ​​the groove (210); The groove (210) is filled with the cover (300), which extends from the groove (210) through the through hole (111) to at least cover the welding area (120).

5. The top cover assembly according to claim 4, characterized in that, The through hole (111) is coaxial with and connected to the groove (210).

6. The top cover assembly according to claim 4, characterized in that, The projection area of ​​the welding area (120) on the first plane is located outside the projection area of ​​the groove (210) on the first plane.

7. The top cover assembly according to claim 4, characterized in that, The projection area of ​​the welding area (120) on the first plane surrounds the projection area of ​​the groove (210) on the first plane.

8. The top cover assembly according to claim 4, characterized in that, The through hole (111) is a constricted structure with large openings at both ends and a small opening in the middle; or, The through hole (111) is a conical structure with a large opening size at one end and a small opening size at the other end; or, The through hole (111) is a columnar structure with the same opening size at both ends.

9. The top cover assembly according to claim 4, characterized in that, The connector (100) includes a first region (130) and a second region (140), the first region (130) being used to connect with the pole post (200), the second region (140) being used to connect with the tab, and the through hole (111) being disposed in the first region (130).

10. The top cover assembly according to claim 4, characterized in that, The through hole (111) is a circular hole.

11. The top cover assembly according to claim 4, characterized in that, The groove (210) is a circular groove (210).

12. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 11.

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