Nano-injection molded battery top cover structure

Abstract

This invention belongs to the field of battery technology, specifically disclosing a nano-injection molded battery top cover structure, including a substrate, a pressure plate, a connecting piece, an injection molded part, and a stop frame. The substrate has mounting holes. The pressure plate is located on the outer side of the substrate. The connecting piece is located on the inner side of the substrate, with one end connected to the pressure plate and the other end connected to a busbar. This invention provides a nano-injection molded battery top cover structure that integrates the pressure plate, substrate, and connecting piece through injection molding, and with the limiting protection of the stop frame, simplifies the structure, reduces costs, decreases the internal space occupied by the battery, increases the welding area on the pressure cover surface, and significantly improves the assembly efficiency and long-term stability of the top cover.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a nano-injection molded battery top cover structure. Background Technology

[0002] Currently, the connection between the top cover and the terminals of cylindrical batteries is mostly achieved using a riveting structure. Existing riveting structures typically include multiple independent components such as a substrate, pressure plate, rivets, retaining bracket, insulating plate, and sealing ring. During assembly, rivets are sequentially passed through the pressure plate, insulating plate, substrate, and sealing ring, and finally riveted and secured to the inner busbar.

[0003] However, the above riveting structure has the following problems: First, the structure involves a large number of parts, which not only leads to high material costs, but also results in a lengthy assembly process. Large tolerances accumulate in multiple stages such as riveting, pressing and sealing testing, resulting in a low overall production yield and making it difficult to meet the needs of low-cost, large-scale mass production.

[0004] Secondly, the traditional pressure plate requires through holes for rivets to pass through, which limits the effective area on the outside of the pressure plate that can be used for laser welding, making it difficult to simplify the busbar connection process.

[0005] Finally, in this riveting structure, the rivet body penetrates from the outside of the substrate and extends into the inside of the battery casing. The part of the rivet extending into the casing occupies the internal space of the cell, resulting in a reduction in the usable volume of the cell, which in turn limits the further improvement of the battery energy density.

[0006] In summary, the existing battery top cover structure suffers from high cost, occupies a large amount of internal battery space, and has a small welding area on the cover surface. Summary of the Invention

[0007] This invention provides a nano-injection molded battery top cover structure, which can solve the problems of high cost, large space occupation in the battery interior, and small welding area on the cover surface in the prior art.

[0008] A nano-injection molded battery top cover structure, comprising: A substrate having mounting holes; A pressure plate is disposed on the outer side of the substrate; A connecting piece is disposed on the inner side of the substrate, with one end of the connecting piece connected to the pressure plate and the other end of the connecting piece connected to the manifold. The injection molded part passes through the mounting hole, and the pressure plate, the substrate and the connecting piece are integrated into one piece by nano-injection molding process; A stop is disposed on the inner side of the substrate, and the stop at least partially accommodates and limits the end of the injection molded part.

[0009] Furthermore, the injection molded part fills the mounting hole to form a seal, and the injection molded part at least partially covers the surfaces of the pressure plate and the connecting piece adjacent to the substrate.

[0010] Furthermore, the surface of the pressure plate and / or the connecting piece has a microporous structure, and the material of the injection molded part penetrates into the microporous structure to form a mechanical interlock.

[0011] Furthermore, the outer peripheral wall of the injection molded part near the stop frame is provided with a first inclined surface; The stop bracket has an assembly hole, and the inner wall of the assembly hole has a second inclined surface that is adapted to the first inclined surface. The first inclined surface and the second inclined surface abut against each other.

[0012] Furthermore, the injection molded part is provided with a connecting part on the outer side of one end near the stop frame; The stop frame is provided with an access slot that mates with the connecting part.

[0013] Furthermore, the pressure plate and the connecting piece are welded together to form a welded joint, and the injection molded part covers the outer periphery of the welded joint to define the relative position of the pressure plate and the connecting piece.

[0014] Furthermore, the connecting piece has an L-shaped bending structure, the first end of the connecting piece is connected to the pressure plate, and the second end of the connecting piece extends along the thickness direction of the substrate to the lower inner side of the substrate for connection with the busbar.

[0015] Furthermore, the injection molded part includes an intermediate connector and a top connector and a bottom connector respectively disposed at both ends of the intermediate connector; The intermediate connector is filled into the mounting hole, the top connector is fixedly connected to the pressure plate, and the bottom connector is accommodated in the stop frame. The width of the middle connector is smaller than the width of the bottom connector, and the width of the bottom connector is not greater than the width of the top connector.

[0016] Furthermore, the top connector has a mounting groove on the side facing the pressure plate, and the pressure plate is at least partially embedded in the mounting groove.

[0017] Furthermore, the surface of the pressure plate away from the substrate protrudes outward to form a protrusion.

[0018] This invention provides a nano-injection molded battery top cover structure, which, compared to existing technologies, has, but is not limited to, the following beneficial effects: In this nano-injection molded battery top cover structure, the substrate serves as the main supporting structure of the battery top cover, possessing sufficient structural strength and corrosion resistance to support the various components of the top cover and ensure structural stability during battery use. Mounting holes can be provided through the substrate's thickness direction to provide molding channels and mounting space for the injection molded parts. A pressure plate is located on the outer side of the substrate (i.e., the side of the substrate facing away from the battery cell). A connecting piece is located on the inner side of the substrate (i.e., the side of the substrate facing the battery cell), with one end of the connecting piece connected to the pressure plate and the other end connected to the busbar. This arrangement allows a conductive path to be formed between the pressure plate and the busbar through the connecting piece, thereby enabling current transmission between the battery terminals and the battery cell. As a feasible implementation, the pressure plate and the connecting piece can be fixedly connected by welding (e.g., laser welding) to ensure the connection strength and conductivity reliability between them.

[0019] The injection molded part passes through mounting holes on the substrate, and the pressure plate, substrate, and connecting piece are integrated into one unit through a nano-injection molding process. Specifically, during the injection molding process, the pre-made pressure plate and connecting piece are placed into the injection mold, with the pressure plate located on the outside of the substrate and the connecting piece located on the inside of the substrate. Then, molten injection material is injected into the mounting holes and the pre-set cavity. After the injection material solidifies, the injection molded part fills the mounting holes and tightly covers at least part of the surface of the pressure plate and connecting piece, thereby fixing the substrate, pressure plate, and connecting piece into a single structure.

[0020] A stop bracket is disposed on the inner side of the substrate, and the stop bracket at least partially accommodates and limits the end of the injection molded part. Specifically, the stop bracket is fixedly installed on the inner surface of the substrate, and its position corresponds to the mounting hole. After the injection molded part is formed, the end of the injection molded part facing the inner side of the substrate extends into the interior of the stop bracket. The stop bracket radially and / or axially limits this end to prevent the injection molded part from shifting or loosening during use, thereby enhancing the overall stability of the top cover structure.

[0021] This invention provides a nano-injection molded battery top cover structure, which integrates the pressure plate, substrate and connecting piece through injection molding, and is protected by a stop frame. While simplifying the structure and reducing costs, it also reduces the internal space occupied by the battery, increases the welding area on the pressure cover surface, and significantly improves the assembly efficiency and long-term stability of the top cover. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a nano-injection molded battery top cover structure provided by the present invention; Figure 2A cross-sectional view of a nano-injection molded battery top cover structure provided by the present invention; Figure 3 This is a schematic diagram of the substrate of a nano-injection molded battery top cover structure provided by the present invention; Figure 4 This is a schematic diagram of the injection molded part of a nano-injection molded battery top cover structure provided by the present invention; Figure 5 This is a schematic diagram of the stop frame of a nano-injection molded battery top cover structure provided by the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Substrate; 101. Mounting hole; 2. Pressure plate; 201. Protrusion; 3. Connecting piece; 4. Injection molded part; 401. First inclined surface; 402. Connecting part; 403. Intermediate connecting piece; 404. Top connecting piece; 405. Bottom connecting piece; 406. Mounting groove; 5. Stop bracket; 501. Assembly hole; 502. Inlet groove; 6. Manifold. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application are described clearly and completely below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," "comprise," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms, indicating that a method comprises one or more steps, or an apparatus comprises one or more elements, but do not exclude the inclusion of other steps or elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or primary / secondary relationship. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0028] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, C and / or B can represent: C existing alone, C and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0029] like Figures 1 to 5 As shown, an embodiment of the present invention provides a nano-injection molded battery top cover structure, including a substrate 1, a pressure plate 2, a connecting piece 3, an injection molded part 4, and a stop frame 5; The substrate 1 has mounting holes 101; the pressure plate 2 is located on the outer side of the substrate 1; The connecting piece 3 is located on the inner side of the substrate 1, and one end of the connecting piece 3 is connected to the pressure plate 2, and the other end of the connecting piece 3 is connected to the busbar 6. The injection molded part 4 passes through the mounting hole 101, and the pressure plate 2, the substrate 1 and the connecting piece 3 are integrated into one piece through nano-injection molding process; The stop 5 is disposed on the inner side of the substrate 1, and the stop 5 at least partially accommodates and limits the end of the injection molded part 4.

[0030] The substrate 1 serves as the main supporting structure for the battery top cover, possessing sufficient structural strength and corrosion resistance to support the various components of the top cover and ensure structural stability during battery use. The mounting hole 101 is provided through the substrate 1 along its thickness direction to provide a molding channel and mounting space for the injection molded part 4.

[0031] The pressure plate 2 is disposed on the outer side of the substrate 1 (i.e., the side of the substrate 1 facing away from the battery cell). The connecting piece 3 is disposed on the inner side of the substrate 1 (i.e., the side of the substrate 1 facing the battery cell), with one end of the connecting piece 3 connected to the pressure plate 2 and the other end connected to the busbar 6. This arrangement allows a conductive path to be formed between the pressure plate 2 and the busbar 6 through the connecting piece 3, thereby enabling current transmission between the battery terminals and the battery cell. As a feasible implementation, the pressure plate 2 and the connecting piece 3 can be fixedly connected by welding (e.g., laser welding) to ensure the connection strength and conductivity reliability between them.

[0032] The injection molded part 4 passes through the mounting hole 101 on the substrate 1, and integrates the pressure plate 2, the substrate 1, and the connecting piece 3 into one unit through a nano-injection molding process. Specifically, during the injection molding process, the pre-made pressure plate 2 and connecting piece 3 are placed into the injection mold, with the pressure plate 2 located on the outside of the substrate 1 and the connecting piece 3 located on the inside of the substrate 1. Then, molten injection material is injected into the mounting hole 101 and the pre-set cavity. After the injection material solidifies, the injection molded part 4 fills the mounting hole 101 and tightly covers at least part of the surface of the pressure plate 2 and the connecting piece 3, thereby fixing the substrate 1, the pressure plate 2, and the connecting piece 3 into a single structure.

[0033] A stop bracket 5 is disposed on the inner side of the substrate 1, and the stop bracket 5 at least partially accommodates and limits the end of the injection molded part 4. Specifically, the stop bracket 5 is fixedly installed on the inner surface of the substrate 1, and its position corresponds to the mounting hole 101. After the injection molded part 4 is formed, one end of the injection molded part 4 facing the inner side of the substrate 1 extends into the interior of the stop bracket 5. The stop bracket 5 radially and / or axially limits this end to prevent the injection molded part 4 from shifting or loosening during use, thereby enhancing the overall stability of the top cover structure.

[0034] This application utilizes the injection molded part 4 as a connecting hub, which not only fills the mounting hole 101 to achieve the functions of sealing and insulation, but also fixes the various components into one piece through the tight bonding force of nano-injection molding. At the same time, it works in conjunction with the stop bracket 5 to limit the end of the injection molded part 4, ensuring the long-term reliability of the top cover structure under battery charging and discharging cycles and mechanical vibration conditions.

[0035] The working principle of this embodiment is as follows: The substrate 1 serves as the supporting skeleton for the top cover, and the mounting holes 101 provided by the substrate 1 provide a through channel for the injection molded part 4, allowing the injection molding material to flow from the outside to the inside of the substrate 1, forming a reliable connection structure that penetrates the thickness direction of the substrate 1 after molding. Further, the pressure plate 2 is disposed on the outside of the substrate 1, and its side facing the substrate 1 is tightly bonded to the injection molded part 4. After the injection molded part 4 is cured, it forms a stable covering and anchoring effect on the pressure plate 2, ensuring that the pressure plate 2 will not detach from the substrate 1 under external force. At the same time, the connecting piece 3 is disposed on the inside of the substrate 1, with one end connected to the pressure plate 2, thereby establishing a conductive path from the pressure plate 2 to the internal connecting piece 3, and the other end connected to the busbar 6.

[0036] Since this conductive path eliminates the need for rivets penetrating into the casing, it effectively frees up usable space inside the battery, providing a structural basis for improving battery energy density. Furthermore, the stop frame 5 is located inside the substrate 1 and accommodates and limits the end of the injection molded part 4. Specifically, after the injection molded part 4 is formed, its end extends into the stop frame 5. When the battery is subjected to impact or vibration, the stop frame 5 can effectively limit the axial displacement and radial sway of the injection molded part 4, preventing it from loosening or cracking due to long-term stress, thereby ensuring the structural integrity and sealing reliability of the top cover assembly under complex operating conditions.

[0037] Overall, this technical solution integrates the pressure plate 2, substrate 1 and connecting piece 3 into one unit through injection molding part 4, and with the limiting protection of stop frame 5, it simplifies the structure and reduces costs, while also reducing the internal space occupied by the battery, increasing the welding area on the pressure cover surface, and significantly improving the assembly efficiency and long-term stability of the top cover.

[0038] like Figures 1 to 2 As shown, in some embodiments of the present invention, the injection molded part 4 fills the mounting hole 101 to form a sealing portion, and the injection molded part 4 at least partially covers the surfaces of the pressure plate 2 and the connecting piece 3 adjacent to the substrate 1.

[0039] Specifically, the sealing part refers to the portion of the injection molded part 4 that fills the mounting hole 101, and its shape matches the cross-sectional shape of the mounting hole 101, used to seal the gap between the inner and outer sides of the substrate 1. The covering of the pressure plate 2 and the connecting piece 3 by the injection molded part 4 refers to the injection molding material adhering to and covering the surface of the above-mentioned components facing the substrate 1 after curing, forming a tightly bonded plastic layer.

[0040] By covering the pressure plate 2 and connecting piece 3 with the injection molded part 4, the bonding strength between the components is enhanced, so that the injection molded part 4 can firmly anchor the pressure plate 2 and connecting piece 3 to the substrate 1 after curing, thus avoiding the loosening problem caused by vibration in the traditional riveting structure.

[0041] like Figures 1 to 2As shown, in some embodiments of the present invention, the surfaces of the pressure plate 2 and / or connecting piece 3 have microporous structures, and the material of the injection molded part 4 penetrates into the microporous structures to form a mechanical interlock.

[0042] Specifically, microporous structures refer to microscopic irregular bumps or pores formed on a metal surface through methods such as chemical etching, anodizing, or laser treatment. Their pore sizes are typically in the nanometer to micrometer range (e.g., 1 nm to 10 μm). Molded materials can flow into these micropores in a molten state, and after solidification, they form a mechanical interlock (i.e., mortise and tenon structure). This structure can be achieved by treating the metal surfaces of the pressure plate 2 and / or connecting piece 3.

[0043] In detail, after the injection molding material penetrates into the micropores, it solidifies and shrinks, fully filling the nano-micropores on the metal surface. It forms a tenon structure with extremely high physical strength with the inner wall of the micropores, which significantly improves the bonding force between the injection molded part 4 and the pressure plate 2 and connecting piece 3. This makes it less likely to peel or fall off under long-term use or temperature change conditions, achieving high strength and high sealing performance.

[0044] Meanwhile, the microporous structure increases the contact area between the injection molding material and the metal surface, further improving the sealing effect and effectively preventing leakage along the bonding interface, thereby ensuring the airtightness of the top cover structure.

[0045] like Figures 1 to 5 As shown, in some embodiments of the present invention, the outer peripheral wall of the injection molded part 4 near the stop frame 5 is provided with a first inclined surface 401; The stop bracket 5 has an assembly hole 501. The inner wall of the assembly hole 501 is provided with a second inclined surface that is adapted to the first inclined surface 401. The first inclined surface 401 and the second inclined surface abut against each other.

[0046] Specifically, the first inclined surface 401 refers to a conical or inclined surface on the outer peripheral wall of the lower end of the injection molded part 4 that is at a certain angle (e.g., 5°~85°) relative to the axial direction of the injection molded part 4. The second inclined surface is a corresponding inclined surface on the inner wall of the assembly hole 501 that matches this angle. The two form an abutting fit through surface contact, thereby realizing the guiding and limiting functions.

[0047] In detail, after the first inclined surface 401 and the second inclined surface abut and cooperate, they can also play a guiding role during the assembly process, so that the lower end of the injection molded part 4 can be smoothly guided into the assembly hole 501 of the stop frame 5, which reduces the assembly difficulty, improves the assembly efficiency, and can effectively prevent the injection molded part 4 from falling out of the stop frame 5 after assembly.

[0048] like Figures 1 to 5As shown, in some embodiments of the present invention, the injection molded part 4 is provided with a connecting part 402 on the outer side of one end near the stop frame 5; the stop frame 5 is provided with an access groove 502 that cooperates with the connecting part 402.

[0049] Specifically, the connecting part 402 refers to the protruding block, flange or annular protrusion structure on the outer peripheral wall of the lower end of the injection molded part 4, and the access groove 502 is the corresponding groove, slot or annular groove structure opened on the inner wall of the stop frame 5. The connecting part 402 is embedded in the access groove 502 to achieve a fit, which can form a mechanical lock.

[0050] In detail, this structure works in conjunction with the aforementioned inclined surface structure, where the inclined surface serves as a guide and initial positioning function, and the connecting part 402 and the access groove 502 serve as the final locking function, thereby forming a multi-level limit and further ensuring the long-term stability of the top cover structure.

[0051] like Figures 1 to 5 As shown, in some embodiments of the present invention, the pressure plate 2 and the connecting piece 3 are welded together to form a welded joint, and the injection molded part 4 covers the outer periphery of the welded joint to define the relative position of the pressure plate 2 and the connecting piece 3.

[0052] Specifically, the welded joint refers to the molten connection area formed between the pressure plate 2 and the connecting piece 3 at the contact position by means of laser welding, resistance welding, or ultrasonic welding. This area achieves electrical connection and mechanical fixation between the two. The injection molded part 4 covers the outer periphery of this joint. That is, during the injection molding process, the injection molding material flows and covers the area around the welded joint, and after curing, it encapsulates the welded joint inside the injection molded part 4.

[0053] The injection molded part 4 effectively disperses the tensile and shear forces experienced by the welded area during use, preventing fatigue cracking of the weld joint under long-term vibration or temperature fluctuations. Simultaneously, the injection molded part 4 covering the outer periphery of the weld joint also provides insulation, preventing the welded area from being exposed and isolating it from external moisture, thus improving the durability of the connection.

[0054] like Figures 1 to 5 As shown, in some embodiments of the present invention, the connecting piece 3 has an L-shaped bending structure, the first end of the connecting piece 3 is connected to the pressure plate 2, and the second end of the connecting piece 3 extends along the thickness direction of the substrate 1 to the lower inner side of the substrate 1 for connection with the busbar 6.

[0055] Specifically, the L-shaped bending structure refers to a plate-like component in which the connecting piece 3 is generally L-shaped, comprising a first end that extends horizontally and a second end that extends vertically or obliquely.

[0056] As a specific example, the L-shaped bending structure includes a horizontally extending first end and a vertically extending second end, which are vertically connected to form an L-shape, with an arc-shaped transition at the connection point. The first end is located on the outer side of the substrate 1 and connected to the pressure plate 2, while the second end passes through a mounting hole 101 on the substrate 1 and extends into the battery along the thickness direction of the substrate 1 (i.e., the axial direction of the battery), thereby conducting the current path from the pressure plate 2 on the outer side of the substrate 1 to the busbar 6 on the inner side below.

[0057] In detail, the L-shaped bending structure allows the connecting piece 3 to bypass the substrate 1 without occupying additional radial space, and its first end connects to the pressure plate 2, increasing the welding area between them. The second end extends inward and downward along the thickness direction of the substrate 1, allowing the second end of the connecting piece 3 to reach the connection position of the busbar 6 via the shortest path, reducing the current transmission path length. Simultaneously, this structure eliminates the need for rivets or other connectors penetrating the substrate 1. Compared to traditional riveting structures, this effectively reduces the intrusion depth of the top cover assembly into the battery casing, freeing up space above the battery cell and thus contributing to further improving the volumetric energy density of the battery.

[0058] like Figures 1 to 5 As shown, in some embodiments of the present invention, the injection molded part 4 includes an intermediate connector 403 and a top connector 404 and a bottom connector 405 respectively disposed at both ends of the intermediate connector 403; the intermediate connector 403 is filled in the mounting hole 101, the top connector 404 is fixedly connected to the pressure plate 2, and the bottom connector 405 is accommodated in the stop frame 5. The width of the middle connector 403 is less than the width of the bottom connector 405, and the width of the bottom connector 405 is not greater than the width of the top connector 404.

[0059] Specifically, the intermediate connector 403 is the columnar portion of the injection molded part 4 that passes through the mounting hole 101, and its external dimensions are adapted to the mounting hole 101; the top connector 404 is the enlarged end of the injection molded part 4 located on the outer side of the base plate 1, used to connect and fix the pressure plate 2; the bottom connector 405 is the enlarged end of the injection molded part 4 located on the inner side of the base plate 1, used to cooperate with the stop bracket 5. The three are connected to each other to form the integral injection molded part 4. The width refers to the maximum radial dimension of each of the above components (for circular cross-section components, it is the diameter; for non-circular cross-section components, it is the maximum radial span).

[0060] The three-section variable diameter structure forms a two-way limiting mechanism in the axial direction of the injection molded part 4. That is, the top connector 404 clamps the substrate 1 from the outside and the bottom connector 405 from the inside, so that the injection molded part 4 forms an integral anchoring structure with the substrate 1 after curing, and a long-term reliable connection can be achieved without additional fasteners.

[0061] like Figures 1 to 5 As shown, in some embodiments of the present invention, the top connector 404 has a mounting groove 406 on the side facing the pressure plate 2, and the pressure plate 2 is at least partially embedded in the mounting groove 406.

[0062] Specifically, the mounting groove 406 refers to the groove or recessed structure opened on the end face of the top connector 404, the shape and size of which match the outline of the pressure plate 2.

[0063] As a specific example, the lower outer end of the pressure plate 2 can be embedded into the mounting groove 406.

[0064] like Figures 1 to 5 As shown, in some embodiments of the present invention, the surface of the pressure plate 2 away from the substrate 1 protrudes outward to form a protrusion 201.

[0065] Specifically, the protrusion 201 refers to the raised structure protruding from the outer side of the pressure plate 2 (i.e., the upper surface away from the substrate 1). It can be circular, square, or rectangular, and the height of the protrusion can be set according to the actual welding process requirements. The protrusion 201 can be integrally formed with the pressure plate 2 by stamping, forging, or machining.

[0066] As a specific example, the protrusion 201 is elongated.

[0067] The protrusion 201 serves as a priority melting area during laser welding, reducing the dispersion of welding energy on the surface of the pressure plate 2. Simultaneously, the protrusion 201 effectively increases the effective welding area while preventing damage to the injection molded part 4 during welding. Furthermore, the protrusion 201 can also serve as an alignment mark during assembly, facilitating visual recognition and precise positioning by automated welding equipment, thereby improving the efficiency and yield of mass production.

[0068] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A nano-injection molded battery top cover structure, characterized in that, include: The substrate (1) has mounting holes (101) on it. A pressure plate (2) is disposed on the outside of the substrate (1); A connecting piece (3) is provided on the inner side of the substrate (1), and one end of the connecting piece (3) is connected to the pressure plate (2), and the other end of the connecting piece (3) is connected to the busbar (6). The injection molded part (4) passes through the mounting hole (101) and combines the pressure plate (2), the substrate (1) and the connecting piece (3) into one piece through nano-injection molding process; A stop (5) is disposed on the inner side of the substrate (1), and the stop (5) at least partially accommodates and limits the end of the injection molded part (4).

2. The nano-injection molded battery top cover structure according to claim 1, characterized in that, The injection molded part (4) fills the mounting hole (101) to form a sealing part, and the injection molded part (4) at least partially covers the surfaces of the pressure plate (2) and the connecting piece (3) adjacent to the substrate (1).

3. The nano-injection molded battery top cover structure according to claim 2, characterized in that, The surfaces of the pressure plate (2) and / or the connecting piece (3) have a microporous structure, and the material of the injection molded part (4) penetrates into the microporous structure to form a mechanical interlock.

4. The nano-injection molded battery top cover structure according to claim 1, characterized in that, The injection molded part (4) has a first inclined surface (401) on the outer peripheral wall of one end near the stop frame (5). The stop frame (5) is provided with an assembly hole (501), and the inner wall of the assembly hole (501) is provided with a second inclined surface that is adapted to the first inclined surface (401). The first inclined surface (401) and the second inclined surface abut against each other.

5. The nano-injection molded battery top cover structure according to claim 4, characterized in that, The injection molded part (4) is also provided with a connecting part (402) on the outer side of one end near the stop frame (5); The stop frame (5) is provided with an access slot (502) that cooperates with the connecting part (402).

6. The nano-injection molded battery top cover structure according to claim 1, characterized in that, The pressure plate (2) and the connecting piece (3) are welded together to form a welded joint, and the injection molded part (4) covers the outer periphery of the welded joint to define the relative position of the pressure plate (2) and the connecting piece (3).

7. The nano-injection molded battery top cover structure according to claim 6, characterized in that, The connecting piece (3) has an L-shaped bending structure. The first end of the connecting piece (3) is connected to the pressure plate (2), and the second end of the connecting piece (3) extends along the thickness direction of the substrate (1) to the lower inner side of the substrate (1) for connection with the busbar (6).

8. The nano-injection molded battery top cover structure according to claim 1, characterized in that, The injection molded part (4) includes an intermediate connector (403) and a top connector (404) and a bottom connector (405) respectively disposed at both ends of the intermediate connector (403). The intermediate connector (403) is filled in the mounting hole (101), the top connector (404) is fixedly connected to the pressure plate (2), and the bottom connector (405) is accommodated in the stop frame (5). The width of the intermediate connector (403) is less than the width of the bottom connector (405), and the width of the bottom connector (405) is not greater than the width of the top connector (404).

9. The nano-injection molded battery top cover structure according to claim 8, characterized in that, The top connector (404) has an installation groove (406) on the side facing the pressure plate (2), and the pressure plate (2) is at least partially embedded in the installation groove (406).

10. The nano-injection molded battery top cover structure according to claim 1, characterized in that, The pressure plate (2) protrudes outward on the side surface away from the substrate (1) to form a protrusion (201).

Images