A high-rate lithium-ion battery cover structure

Abstract

This invention provides a high-rate lithium-ion battery cover structure, belonging to the field of battery cover technology. It includes a cover plate, terminals, a reinforcing plate, a sealing ring, and a clamping post. The cover plate has mounting holes. This high-rate lithium-ion battery cover structure effectively compensates for the weakened local rigidity caused by the large-diameter mounting holes created by increasing the cross-sectional area of ​​the terminals through the inclusion of a reinforcing plate independent of the cover plate. Furthermore, by combining the clamping post and the mold's tight fit, the covering and locking of the reinforcing plate by the encapsulating material, and the stable connection between the terminals and the cover plate, the overall structure effectively improves the structural strength and long-term sealing stability of the cover assembly while ensuring high-rate performance output, and also has the advantage of easy assembly and production.

Description

Technical Field

[0001] This invention relates to the field of battery cover technology, specifically to a high-rate lithium-ion battery cover structure. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage technologies, increasingly stringent requirements have been placed on the rate performance of lithium-ion batteries. High-power charging and discharging has become one of the key indicators for measuring battery performance. As a core structural component and safety barrier of the battery, the battery cover plate, with its terminals (including positive and negative terminals), plays a crucial role in efficiently leading the internal cell current to the external circuit. The current conduction capacity of the terminals directly affects the rate performance and thermal safety of the battery.

[0003] In existing technologies, the cross-sectional area of ​​the battery cover terminals is typically limited by the finite installation space of the cover and the inertia of traditional designs. Under high-rate discharge conditions, insufficient terminal cross-sectional area leads to a significant increase in contact resistance, causing severe ohmic polarization when large currents pass through, resulting in excessively high localized temperatures. This not only limits the battery's power output capability but also accelerates the aging process of surrounding non-metallic materials such as seals, creating potential safety hazards such as thermal runaway and electrolyte leakage, severely restricting the battery's reliability and lifespan.

[0004] To address these issues, existing solutions primarily follow two technical paths: First, reducing resistivity by altering the electrode material (e.g., using a copper-aluminum composite structure). However, limited by the material's conductivity and cost, this improvement faces significant bottlenecks, failing to meet the demands of continuously increasing rate performance. Second, reducing current density by increasing the electrode size to enlarge the current-conducting cross-sectional area. While this approach is direct and effective, it inevitably requires larger diameter mounting holes in the cover plate, significantly weakening the structural rigidity of the area surrounding the electrode hole. Under the rebound force generated by the long-term compression of the sealing ring, if the structural rigidity of the area around the hole is insufficient to resist this continuous load, warping or plastic deformation may still occur, disrupting the pressure distribution at the sealing interface and ultimately leading to seal failure.

[0005] To address the strength loss caused by enlarged mounting holes, existing technologies have attempted to compensate by adding local bosses at the edge of the mounting holes, welding reinforcing components, and using flanging or rolling structures. However, all of these reinforcement measures involve secondary processing of the cover plate substrate or welding of additional components, significantly increasing manufacturing complexity and limiting production and assembly efficiency. Specifically, boss structures need to be formed on the cover plate substrate through stamping or forging processes, increasing the number of process steps and requiring high precision in the molds; welding reinforcing components require specialized welding equipment and processes, increasing equipment investment and labor costs, and potentially introducing additional quality problems such as welding deformation and weld spatter; while flanging or rolling structures can improve the stiffness around the hole to some extent, they have stringent requirements for material ductility and process parameter control, making yield control difficult. With the trend towards compact design of the overall cover plate size, the area available for operation and processing is already limited, further restricting the implementation space of the above reinforcement measures.

[0006] It is evident that there is a contradiction between "increasing the cross-sectional area of ​​the electrode post to meet the rate performance" and "the enlargement of the mounting hole leads to structural weakening and the need to introduce complex strengthening processes" in the existing technology. There is an urgent need for a battery cover structure that can take into account high rate performance output, structural strength and long-term sealing stability, and is easy to assemble and produce. Summary of the Invention

[0007] This invention provides a high-rate lithium-ion battery cover structure including a cover plate, an electrode post, a reinforcing plate, a sealing ring, and a clamping post. The cover plate has mounting holes. The electrode post has a limiting platform extending outwards from its bottom, and an injection groove is formed on its outer peripheral wall. The reinforcing plate has a through hole and abuts against the top surface of the cover plate. The through hole is coaxial with the mounting hole, and the diameter of the through hole is smaller than or equal to the diameter of the mounting hole. The sealing ring is fitted onto the electrode post and pressed between the limiting platform and the bottom surface of the cover plate, and the inner diameter of the sealing ring is larger than that of the sealing ring. The inner diameter of the mounting hole forms an inverted injection area between the lower part of the cover plate, the inner circumference of the sealing ring, and the upper surface of the limiting platform. There are gaps between the pole and the wall of the mounting hole, and between the pole and the wall of the through hole. The injection area and the injection groove are interconnected through the gaps and together form the injection cavity. The clamping post is set on the top surface of the reinforcing plate to receive the pressure of the mold during the injection process, so that the reinforcing plate is kept in close contact with the top surface of the cover plate. The injection cavity is injection molded with an encapsulated body, and the reinforcing plate is at least partially wrapped in the encapsulated body.

[0008] In one possible implementation, the injection groove is an annular structure, and its bottom surface is not higher than the top surface of the sealing ring.

[0009] In one possible implementation, a positioning ring is provided on the limiting platform, and a sealing ring is located inside the positioning ring.

[0010] In one possible implementation, both the reinforcing plate and the limiting platform are rectangular structures.

[0011] In one possible implementation, the top surface of the cover plate is provided with a limiting protrusion, and the reinforcing plate is provided with a corresponding limiting groove. The limiting protrusion and the limiting groove cooperate to position the reinforcing plate in the radial and circumferential directions, so that the mounting hole and the through hole remain coaxial.

[0012] In one possible implementation, the limiting protrusion is two straight protrusions symmetrically distributed along the length of the cover plate, and the limiting groove at the bottom of the reinforcing plate is a corresponding straight groove.

[0013] In one possible implementation, the clamping pins are numerous and distributed circumferentially along the mounting holes.

[0014] In one possible implementation, the cover plate includes an upper cover and a lower insulating support, which are fixedly connected. A connecting piece is provided at the bottom of the pole post. A sealing ring is pressed between the limiting platform and the bottom surface of the upper cover. The connecting piece abuts against and fits against the lower insulating support.

[0015] The above-described one or more technical solutions in the embodiments of the present invention have the following technical effects: By setting a reinforcing plate independent of the cover plate, which abuts against the top surface of the cover plate and covers the area around the mounting hole, a superimposed force-bearing structure is formed with the cover plate, effectively compensating for the weakened local stiffness caused by opening a large-diameter mounting hole due to the increased cross-sectional area of ​​the electrode post. This ensures that the cross-sectional area of ​​the electrode post can fully meet the current-carrying capacity requirements of high-rate performance and guarantees the overall structural strength and sealing reliability. Furthermore, before injection molding, the reinforcing plate is stably attached to the cover plate by the abutment of the mold and the clamping column. After injection molding, it is further reinforced by overmolding. The body is covered and positioned to maintain a tight fit, achieving structural reinforcement around the mounting holes without welding. Simultaneously, the portion of the overmolded body within the injection groove forms an axial clamping mechanism with the limiting platform, firmly connecting the pole and cover plate as a single unit and ensuring reliable compression of the sealing ring. A reverse-locking structure within the injection area below the cover plate, combined with the overall continuity of the overmolded body, further locks the fit of the reinforcing plate. This reverse-locking structure also increases the contact area and mechanical engagement between the overmolded body and the cover plate, effectively preventing separation or loosening of the overmolded body due to excessive localized stress. Overall, while ensuring high-rate performance output, it effectively improves the structural strength and long-term sealing stability of the cover plate assembly, and also offers the advantage of easy assembly and production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a high-rate lithium-ion battery cover plate provided in an embodiment of the present invention;

[0017] Figure 2This is a partial structural schematic diagram of a high-rate lithium-ion battery cover structure provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the electrode post and limiting platform of a high-rate lithium-ion battery cover structure provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the upper cover and limiting protrusion of a high-rate lithium-ion battery cover structure provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the upper cover and reinforcing plate of a high-rate lithium-ion battery cover structure provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the upper cover and the encapsulating body of a high-rate lithium-ion battery cover structure provided in an embodiment of the present invention.

[0022] In the diagram: 1. Cover plate; 101. Upper cover; 102. Lower insulating support; 2. Mounting hole; 3. Pole post; 31. Limiting platform; 32. Glue injection groove; 33. Positioning ring; 4. Reinforcing plate; 41. Through hole; 42. Limiting groove; 5. Sealing ring; 6. Glue injection area; 7. Pressing post; 8. Limiting protrusion; 9. Glue-coated body; 10. Connecting piece. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Please see Figures 1-6 A high-rate lithium-ion battery cover structure includes a cover plate 1, mounting holes 2, electrode posts 3, reinforcing plates 4, sealing rings 5, and injection-molded encapsulated bodies 9.

[0025] The cover plate 1 includes an upper cover body 101 and a lower insulating support body 102, which are stacked on top of each other and fixedly connected as a whole. The upper cover body 101 is a metal base, and mounting holes 2 are formed vertically on the upper cover body 101 and symmetrically distributed horizontally (e.g., ...). Figure 4 (As shown). The lower insulating support 102 is attached to the bottom surface of the upper cover 101 and is made of insulating material.

[0026] Each electrode post 3 corresponds one-to-one with a mounting hole 2. One electrode post 3 is a positive aluminum electrode post, and the other is a negative copper-aluminum composite electrode post. The electrode post 3 is vertically inserted into the mounting hole 2. A limiting platform 31 extending outwards is provided at the bottom of the electrode post 3 (i.e., the end located below the cover plate 1). Figure 3 As shown, the limiting platform 31 is a rectangular structure used to prevent the pole post 3 from detaching upwards from the cover plate 1. The outer peripheral wall of the pole post 3 has an injection groove 32 (e.g., ...). Figure 2 As shown), the glue injection groove 32 is an annular groove extending circumferentially along the pole post 3.

[0027] The upper surface of the limiting platform 31 is provided with a positioning ring 33 (e.g., Figure 3 As shown, the positioning ring 33 is an annular protrusion structure, and its inner diameter is adapted to the outer diameter of the sealing ring 5. The sealing ring 5 is sleeved on the pole post 3 and embedded in the inner side of the positioning ring 33. The outer side wall of the sealing ring 5 abuts against the inner side wall of the positioning ring 33. The positioning ring 33 radially limits the sealing ring 5, preventing eccentric displacement between the sealing ring 5 and the pole post 3, and ensuring that the sealing ring 5 and the pole post 3 are coaxially arranged. At the same time, a gap is maintained between the sealing ring 5 and the outer peripheral wall of the pole post 3, which provides a path for the subsequent flow of injection molding material.

[0028] The reinforcing plate 4 is a plate-shaped component independent of the cover plate 1, abutting against the top surface of the cover plate 1 (i.e., the upper surface of the upper cover 101), and corresponding one-to-one with the mounting holes 2. The reinforcing plate 4 has through holes 41 (e.g., ...). Figure 5 As shown in the figure, the through hole 41 is coaxially arranged with the mounting hole 2, and the diameter of the through hole 41 is not larger than the diameter of the mounting hole 2, so that the reinforcing plate 4 can fully cover the top surface area of ​​the cover plate 1 around the opening of the mounting hole 2. After the reinforcing plate 4 is attached to the top surface of the cover plate 1, it forms a superimposed force-bearing structure with the cover plate 1, effectively improving the structural rigidity of the area around the mounting hole 2. Among them, the reinforcing plate 4 is a rectangular structure (e.g., Figure 5 As shown), to provide a larger bonding coverage area on the top surface of cover plate 1, further enhancing the reinforcement effect on the structure of cover plate 1.

[0029] Several clamping columns 7 are provided on the top surface of the reinforcing plate 4. The clamping columns 7 are columnar structures protruding from the surface of the reinforcing plate 4 and are evenly distributed along the circumference of the mounting holes 2. They are used to receive the resistance of the injection mold during the injection molding process.

[0030] A limit protrusion 8 is provided on the top surface of the cover plate 1 (e.g. Figure 4 As shown), a limiting groove 42 is provided on the bottom surface of the reinforcing plate 4, and the limiting protrusion 8 cooperates with the limiting groove 42 to position the reinforcing plate 4 in the radial and circumferential directions, so that the mounting hole 2 and the through hole 41 remain coaxial.

[0031] A connecting piece 10 is also fixedly welded to the bottom of the pole post 3. The connecting piece 10 has a rectangular structure and is located below the lower insulating support 102. The upper surface of the connecting piece 10 abuts against the lower surface of the lower insulating support 102. It provides support force to the lower insulating support 102 from bottom to top. After injection molding, this support force is maintained by the locking of the overmolding body 9, so that a stable surface contact is formed between the connecting piece 10 and the lower insulating support 102, further enhancing the structural rigidity of the overall structure.

[0032] Assembly process: First, the upper cover 101 and the lower insulating support 102 are fixedly assembled as one unit. At the same time, the connecting piece 10 is first welded to the pole post 3, and then the sealing ring 5 is sleeved on the pole post 3, and the sealing ring 5 is embedded in the positioning ring 33 on the limiting platform 31.

[0033] Then, the pole post 3 is passed from bottom to top through the corresponding mounting holes 2 of the lower insulating support 102 and the upper cover 101 until the sealing ring 5 is pressed between the limiting platform 31 and the upper cover 101. To facilitate temporary positioning and fixing during assembly, a snap-fit ​​structure (not shown in the figure) is provided between the lower insulating support 102 and the limiting platform 31. Specifically, the lower insulating support 102 has stepped holes extending vertically, with the lower section of the stepped hole being a rectangular structure matching the limiting platform 31. The snap-fit ​​structure includes a limiting protrusion on the inner wall of the lower section of the stepped hole and a limiting eave on the outer peripheral wall of the limiting platform 31. When the pole post 3 is inserted from bottom to top, the limiting eave will pass over the limiting protrusion, causing it to elastically avoid the protrusion. After insertion, the limiting protrusion limits the limiting eave from the lower end, preventing the pole post 3 from moving downwards, thus initially connecting the pole post 3 and the lower insulating support 102 together.

[0034] Next, the reinforcing plate 4 is assembled onto the top surface of the cover plate 1. Specifically, the limiting groove 42 at the bottom of the reinforcing plate 4 is aligned with the limiting protrusion 8 on the upper cover 101 and the two are fitted together. Finally, the assembled cover plate 1 is sent to the injection molding station for injection molding. The limiting protrusion 8 consists of two straight protrusions symmetrically distributed along the length of the cover plate 1 (e.g., ...). Figure 4 (As shown). The limiting groove 42 at the bottom of the reinforcing plate 4 is a straight groove that matches it. After the two are fitted together, the reinforcing plate 4 is initially limited to the cover plate 1 in the radial and circumferential directions. That is, it cannot be translated radially and cannot be rotated circumferentially. This keeps the through hole 41 and the mounting hole 2 coaxial, providing a reliable pre-positioning for subsequent injection molding. It should be noted that the aforementioned limiting protrusion 8 is only used for assembling and positioning the reinforcing plate 4. It is small in size and can be integrally formed with the upper cover 101 by stamping process without additional processing steps, making the processing simple.

[0035] Formation of injection cavity: such as Figure 2As shown, the inner diameter of the sealing ring 5 is larger than the inner diameter of the mounting hole 2, so that the area around the opening of the mounting hole 2, the inner wall of the sealing ring 5, the local area of ​​the upper surface of the limiting platform 31, and the outer peripheral wall of the pole post 3 together form an inverted glue injection area 6 located below the upper cover 101. The glue injection area 6 has a ring structure.

[0036] There are gaps between the electrode post 3 and the wall of the mounting hole 2, and between the electrode post 3 and the wall of the through hole 41. The injection area 6 and the injection groove 32 are interconnected through these gaps and together form an injection cavity. This injection cavity extends downward from the injection groove 32 above the electrode post 3, through the gap between the electrode post 3 and the mounting hole 2, to the injection area 6 below the cover plate 1, forming a complete injection material flow channel. The bottom surface of the injection groove 32 is not higher than the top surface of the sealing ring 5. Specifically, the bottom surface of the injection groove 32 is the upper surface of the limiting platform 31 (e.g., Figure 3 (As shown). Increasing the gap between the electrode post 3, the mounting hole 2, and the through hole 41 facilitates the flow of injection molding material and improves injection molding quality. It should be noted that this invention, by appropriately increasing the gap between the electrode post 3 and the mounting hole 2 (i.e., appropriately sacrificing the solid diameter of the electrode post 3), provides a smooth flow channel for the injection molding material and molding space for the undercut structure, thereby replacing the traditional welding or mechanical locking process with a single injection molding. Although the solid cross-sectional area of ​​the electrode post 3 is slightly reduced, this reduction is controlled within the cross-sectional area increase resulting from the overall increase in the diameter of the electrode post 3—the increase in the diameter of the electrode post 3 is sufficient to fully meet the current carrying capacity requirements of high-rate performance.

[0037] Injection molding process: Before injection molding, the pole post 3, reinforcing plate 4, and sealing ring 5 are assembled on the cover plate 1 according to the aforementioned structure, and the entire assembly is placed in the injection mold.

[0038] After the mold is closed, the upper mold abuts against the clamping column 7 on the top surface of the reinforcing plate 4, and the clamping column 7 applies downward pressure to the reinforcing plate 4, so that the lower surface of the reinforcing plate 4 is tightly attached to the top surface of the cover plate 1, ensuring a tight fit between the reinforcing plate 4 and the cover plate 1. The reinforcing plate 4 is entirely located inside the mold.

[0039] Subsequently, molten injection molding material (insulating PPS) is injected into the injection cavity. After cooling and solidifying in the injection cavity, the injection molding material forms an integrally molded overmolded body 9. This overmolded body 9 continuously and without breaks fills the injection groove 32, the gap between the pole post 3 and the mounting hole 2, and the injection area 6 below the cover plate 1.

[0040] Firstly, the portion of the adhesive-filled groove 32 containing the adhesive body 9 forms an axial clamping fit with the limiting platform 31. The adhesive-filled groove 32 is an annular groove formed on the outer peripheral wall of the pole post 3, with both its upper and lower side walls being annular surfaces perpendicular to the axis of the pole post 3. After the adhesive body 9 fills the groove and cures, it forms an annular locking structure embedded inside the pole post 3. This structure and the limiting platform 31 act on the cover plate 1 from both the upper and lower directions—the adhesive body 9 in the adhesive-filled groove 32 prevents the pole post 3 from moving upward through its lower annular surface, while the limiting platform 31 prevents the pole post 3 from moving downward through its upper surface. The two form opposing clamps, fastening the pole post 3 and the cover plate 1 together. At the same time, this clamping force also causes the limiting platform 31 to form a stable axial pressure on the sealing ring 5, so that the sealing ring 5 forms a stable sealing connection area between the upper cover 101 and the limiting platform 31.

[0041] Secondly, the reinforcing plate 4 achieves permanent adhesion under the action of the overmolding body 9. Before injection molding, the reinforcing plate 4 is tightly adhered to the upper cover 101 by the clamping column 7 pressed against it by the mold. Then, during the injection molding process of the overmolding body 9, the molten injection material covers the reinforcing plate 4 from top to bottom, encasing both the clamping column 7 and the reinforcing plate 4 within it. After the injection material solidifies, the overmolding body 9 forms a covering and limiting effect on the reinforcing plate 4, keeping the reinforcing plate 4 tightly adhered to the top surface of the cover plate 1. No additional welding or riveting or other fixing connection processes are required, effectively improving the convenience of assembly and production processes. After the reinforcing plate 4 is adhered to the top surface of the cover plate 1, a superimposed reinforcing layer is formed around the opening of the mounting hole 2, significantly improving the structural stiffness and bending section modulus of this area, effectively resisting the deformation caused by the rebound force of the sealing ring 5 and external vibration loads.

[0042] Thirdly, the encapsulated body 9 within the glue injection area 6 forms an inverted locking structure. The glue injection area 6 is located below the cover plate 1 and consists of an annular space formed by the inner diameter of the sealing ring 5 being larger than the inner diameter of the mounting hole 2. After the encapsulated body 9 fills this area and cures, it forms an inverted structure that protrudes radially outward. The outer diameter of this inverted structure is larger than the diameter of the mounting hole 2 and abuts against the bottom surface of the cover plate 1. This inverted structure serves a dual function: on the one hand, the inverted structure further locks the fit between the reinforcing plate 4 and the cover plate 1 through the overall continuity of the encapsulated body 9; on the other hand, the inverted structure increases the contact area and mechanical interlocking degree between the encapsulated body 9 and the cover plate 1. When the encapsulated body 9 in the glue injection groove 32 is subjected to the reaction force transmitted by the electrode post 3, the inverted structure can effectively disperse and transmit this force to the cover plate 1, preventing the encapsulated body 9 from separating from or loosening from the cover plate 1 due to excessive local force, thereby ensuring that the stability of the axial positioning of the encapsulated body 9 on the electrode post 3 remains effective throughout the entire battery life cycle.

[0043] The three functional areas mentioned above are interconnected and mutually reinforcing through the integrated molding of the encapsulated body 9: the encapsulated body 9 in the injection groove 32 and the limiting platform 31 together clamp the pole post 3; the clamping force is transmitted to the sealing ring 5 through the pole post 3 to ensure its compression; at the same time, the encapsulated body 9 wraps and presses the reinforcing plate 4 onto the top surface of the cover plate 1 during the injection molding process to achieve structural reinforcement; and the inverted structure closes all the above forces between the cover plate 1 and the encapsulated body 9 through mechanical interlocking, forming a stable closed-loop force system.

[0044] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; 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 invention according to the specific circumstances.

[0046] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-rate lithium-ion battery cover structure, comprising a cover plate having mounting holes thereon; characterized in that: Also includes: The pole has a limiting platform extending outward from its bottom, and an injection groove is provided on its outer peripheral wall. A reinforcing plate with a through hole is attached to the top surface of the cover plate. The through hole is coaxial with the mounting hole, and the diameter of the through hole is less than or equal to the diameter of the mounting hole. A sealing ring is fitted onto the pole post and pressed between the bottom surface of the limiting platform and the cover plate. The inner diameter of the sealing ring is larger than the inner diameter of the mounting hole, so as to form an inverted glue injection area between the bottom of the cover plate, the inner circumference of the sealing ring and the upper surface of the limiting platform. There are gaps between the pole post and the hole wall of the mounting hole, and between the pole post and the hole wall of the through hole. The glue injection area and the glue injection groove are interconnected through the gaps and together form the injection cavity. The clamping column is set on the top surface of the reinforcing plate and is used to receive the pressure of the mold during the injection molding process, so that the reinforcing plate is kept in close contact with the top surface of the cover plate. The injection cavity is injection molded with an encapsulated body, and the reinforcing plate is at least partially encapsulated in the encapsulated body.

2. The high-rate lithium-ion battery cover structure according to claim 1, characterized in that: The glue injection groove has an annular structure, and its bottom surface is not higher than the top surface of the sealing ring.

3. The high-rate lithium-ion battery cover structure according to claim 1, characterized in that: A positioning ring is provided on the limiting platform, and the sealing ring is located inside the positioning ring.

4. The high-rate lithium-ion battery cover structure according to claim 1, characterized in that: Both the reinforcing plate and the limiting platform are rectangular structures.

5. The high-rate lithium-ion battery cover structure according to claim 1, characterized in that: The top surface of the cover plate is provided with a limiting protrusion, and the reinforcing plate is provided with a corresponding limiting groove. The limiting protrusion and the limiting groove cooperate to position the reinforcing plate in the radial and circumferential directions, so that the mounting hole and the through hole remain coaxial.

6. The high-rate lithium-ion battery cover structure according to claim 5, characterized in that: The limiting protrusion is a straight protrusion structure that is symmetrically distributed along the length of the cover plate, and the limiting groove at the bottom of the reinforcing plate is a straight groove that matches it.

7. A high-rate lithium-ion battery cover structure according to claim 1 or 4, characterized in that: The clamping pins are numerous and distributed circumferentially along the mounting holes.

8. A high-rate lithium-ion battery cover structure according to claim 1 or 4, characterized in that: The cover plate includes an upper cover and a lower insulating support, which are fixedly connected. A connecting piece is provided at the bottom of the pole post. The sealing ring is pressed between the limiting platform and the bottom surface of the upper cover. The connecting piece abuts against and fits against the lower insulating support.

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