Cover plate assembly and battery

Abstract

The application relates to the technical field of batteries, and discloses a cover plate assembly and a battery. The cover plate assembly comprises a cover plate body, the cover plate body is provided with a pole mounting hole, the cover plate body comprises a cover plate first surface and a turned-up edge structure which is formed by at least partial outward extension of the cover plate first surface and bending towards the direction of the pole mounting hole, and the turned-up edge structure is arranged around the pole mounting hole; a pole module is arranged in the pole mounting hole, the pole module comprises a pole and an insulating piece, and the insulating piece is arranged between the pole and the turned-up edge structure; the pole comprises a pole top surface which is suitable for electrical connection with an external structure; a turned-up edge top surface is formed on the side of the turned-up edge structure which is away from the cover plate first surface in the direction perpendicular to the cover plate first surface; the insulating piece is at least partially higher than the turned-up edge top surface in the direction perpendicular to the cover plate first surface, and a stepped structure is formed in the region between the turned-up edge top surface and the pole top surface. The cover plate assembly provided by the application can prolong the creepage distance and reduce the short circuit risk.

Description

Technical Field

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

[0002] In the battery industry, the terminals and cover plates are key components, and the reliability of their structure and connection method is crucial to the battery's safety performance. To ensure the connection strength between the terminals and the cover plates, the cover plates are often equipped with a flange structure. The flange structure is used to press the terminals together during the riveting process, thereby achieving a firm mechanical connection.

[0003] However, both the pole and the cover are usually made of conductive metal. After riveting, the minimum distance between the flange and the pole is often very close, which increases the risk of creepage between the pole and the cover, posing a risk of insulation failure and potentially leading to safety issues such as short circuits and leakage. Utility Model Content

[0004] In view of this, this application provides a cover plate assembly and a battery to solve the problem of creepage risk between the flange of the cover plate and the terminal post.

[0005] In a first aspect, this application provides a cover plate assembly, comprising: The cover plate body has a pole mounting hole. The cover plate body includes a first surface of the cover plate and a flange structure formed by at least a portion of the first surface of the cover plate extending outward and bending toward the pole mounting hole. The flange structure is arranged around the pole mounting hole. A pole module is provided in the pole mounting hole. The pole module includes a pole and an insulating component. The insulating component is located between the pole and the flange structure. The pole includes a top surface suitable for electrical connection with an external structure. Along the direction perpendicular to the first surface of the cover plate, the side of the flange structure away from the first surface of the cover plate forms a flange top surface; Along a direction perpendicular to the first surface of the cover plate, the insulating element is at least partially higher than the top surface of the flange, and the area of ​​the insulating element between the top surface of the flange and the top surface of the pole forms a stepped structure.

[0006] Beneficial Effects: The cover plate assembly provided in this application, by setting a stepped structure formed by an insulating element between the top surface of the flange and the top surface of the terminal post, creates a height difference in the insulating element in this area. Furthermore, the tortuous path of the stepped structure effectively extends the creepage distance, thereby reducing the risk of short circuits between the terminal post and the cover plate and improving the overall safety performance of the battery. In addition, along a direction perpendicular to the first surface of the cover plate, the insulating element is at least partially higher than the top surface of the flange, ensuring an effective insulation barrier between the flange structure and the terminal post, further preventing abnormal current conduction along the surface of the insulating element.

[0007] Secondly, this application also provides a battery, including: a casing; And a cover plate assembly as described above is disposed on the outer casing, the outer casing and the cover plate assembly enclosing and forming a receiving cavity; The battery cell is housed within a cavity and has tabs that are electrically connected to the terminals of the cover plate structure.

[0008] Since the battery includes a cover assembly, which has the same effect as the cover assembly, it will not be elaborated further here. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is an exploded view of the cover plate assembly of this application; Figure 2 This is a partial enlarged view of the cover plate assembly of this application; Figure 3 This is a schematic diagram of the pole module of this application; Figure 4 This is an exploded view of the pole module of this application; Figure 5 This is a cross-sectional view of the cover plate assembly of this application; Figure 6 for Figure 5 A magnified view of a portion of the image; Figure 7 This is a partially enlarged view of the cross-section of another cover plate assembly.

[0011] Explanation of reference numerals in the attached figures: 1. Cover plate body; 11. Flanged structure; 111. Extension; 112. Pressing part; 12. Pole post mounting hole; 13. Support part; 102. Inner side of the flange; 103. Top surface of the flange; 104. First surface of the cover plate; 2. Pole post module; 21. Pole post; 211. Limiting part; 212. Transition part; 213. Top surface of pole post; 22. Insulating component; 221. Abutting part; 222. Insulating stepped part; 223. Clearance hole; 224. Clearance groove; 2201, Insulation top surface; 2202, Insulation inner surface. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0014] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection 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 connection 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.

[0015] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0016] In the battery industry, the terminals and cover plates are key components, and the reliability of their structure and connection method is crucial to the battery's safety performance. To ensure the connection strength between the terminals and the cover plates, the cover plates are often equipped with a flange structure. The flange structure is used to press the terminals together during the riveting process, thereby achieving a firm mechanical connection.

[0017] Both the terminals and the cover plate are typically made of conductive metal. To ensure insulation between the terminals and the cover plate, insulating gaskets or other insulating components are usually placed between them. After riveting, the minimum distance between the flange and the terminal is often very close. However, with the increasing complexity of battery operating environments, traditional insulating components may shift or fail under prolonged vibration or temperature changes, leading to a decrease in insulation performance. This increases the risk of creepage between the terminals and the cover plate, posing a risk of insulation failure and potentially causing safety issues such as short circuits and leakage.

[0018] The following is combined with Figures 1 to 7 This describes an embodiment of the present application.

[0019] According to an embodiment of this application, in one aspect, a cover plate assembly is provided, comprising: The cover plate body 1 has a pole mounting hole 12. The cover plate body 1 includes a cover plate first surface 104 and a flange structure 11 formed by at least part of the cover plate first surface 104 extending outward and bending towards the pole mounting hole 12. The flange structure 11 is arranged around the pole mounting hole 12. The pole module 2 is disposed in the pole mounting hole 12. The pole module 2 includes a pole 21 and an insulating component 22. The insulating component 22 is disposed between the pole 21 and the flange structure 11. The pole 21 includes a pole top surface 213 suitable for electrical connection with an external structure. Along the direction perpendicular to the first surface 104 of the cover plate, the side of the flange structure 11 away from the first surface 104 of the cover plate forms a flange top surface 103; Along the direction perpendicular to the first surface 104 of the cover plate, the insulating member 22 is at least partially higher than the top surface 103 of the flange, and the area of ​​the insulating member 22 between the top surface 103 of the flange and the top surface 213 of the pole post forms a stepped structure.

[0020] The cover plate body 1 of this application has a pole mounting hole 12, and the pole module 2 is disposed in the pole mounting hole 12. In order to achieve a stable connection between the pole module 2 and the cover plate body 1, the cover plate body 1 has a flange structure 11 around the pole mounting hole 12. The flange structure 11 is suitable for pressing and fixing the pole module 2 in the position of the pole mounting hole 12, thereby preventing the pole module 2 from loosening or falling off during use.

[0021] The flange structure 11 can be integrally formed with the cover plate body 1 through a stamping process.

[0022] Since both the cover plate body 1 and the pole post 21 are made of metal, it is necessary to ensure that the insulating component 22 can effectively prevent direct contact between them during assembly. Furthermore, after the flange structure 11 is riveted, the minimum distance between the flange structure 11 and the pole post 21 is often very close, and there is still a risk of creepage between the pole post 21 and the cover plate body 1. Therefore, the structure of the insulating component 22 needs further optimization to reduce the risk of creepage between the pole post 21 and the cover plate body 1. It should be noted that creepage distance refers to the shortest path between two conductive parts measured along the surface of the insulating material.

[0023] The cover assembly provided in this application, by providing a stepped structure formed by an insulating member 22 between the top surface 103 of the flange and the top surface 213 of the terminal post, creates a height difference in the insulating member 22 in this area. Furthermore, the tortuous path of the stepped structure effectively extends the creepage distance, thereby reducing the risk of short circuit between the terminal post 21 and the cover body 1, and improving the overall safety performance of the battery. In addition, along a direction perpendicular to the first surface of the cover, the insulating member 22 is at least partially higher than the top surface 103 of the flange, ensuring an effective insulation barrier between the flange structure 11 and the terminal post 21, further preventing abnormal current conduction along the surface of the insulating member 22.

[0024] In some embodiments, combined with Figure 4 As shown, along the direction perpendicular to the first surface 104 of the cover plate, the insulating member 22 has an abutting portion 221 that abuts against the flange structure 11, and at least one insulating step portion 222 extending from the abutting portion 221 toward the top surface 213 of the pole post.

[0025] The contact portion 221 fits tightly against the flanged top surface 103 to limit the displacement of the insulating component 22; the insulating step portion 222 rises step by step along the axial direction of the pole post 21 to form multiple height differences, thereby further extending the creepage path.

[0026] The abutment portion 221 and the insulating step portion 222 together constitute the main body of the stepped structure, so that the insulating member 22 forms a continuous and progressively rising insulating barrier between the top surface of the flange and the top surface of the pole post. In this embodiment, the abutment portion 221 and the insulating step portion 222 are integrally formed.

[0027] The number of insulating steps 222 can be set according to actual needs, such as one, two or more steps, to achieve good insulation while ensuring structural strength. The height of each step can be equal or unequal, and the total increase is not less than the height difference between the top surface of the flange 103 and the top surface of the pole post 213, ensuring that after the flange structure 11 is riveted, the insulating part 22 can still be at least partially higher than the top surface of the flange 103, effectively blocking the current path extending along the insulating surface to the cover plate body 1.

[0028] In some embodiments, the number of insulating step portions 222 is greater than or equal to two.

[0029] As one implementation, there are two insulating step portions 222, and the two insulating step portions 222 are arranged sequentially along the axial direction of the pole post 21 to form a staggered multi-level step structure, thereby maximizing the creepage path within a limited space.

[0030] In other implementations, the number of insulating step portions 222 can be set to three or more. By further adding insulating step portions 222, the creepage path is extended and folded back on the original basis, significantly improving insulation reliability. The synergistic effect of the multi-stage step structure not only enhances the ability to block electric arcs, but also effectively suppresses the aging of insulation materials caused by partial discharge.

[0031] In some embodiments, combined with Figure 5 , Figure 6 As shown, along the direction perpendicular to the first surface 104 of the cover plate, the insulating member 22 forms an insulating top surface 2201 on the side near the top surface 213 of the pole post; The height difference between the flanged top surface 103 and the insulating top surface 2201 is D, in mm, and satisfies: 0.01≤D≤1.

[0032] By limiting the lower limit of the height difference D between the flange top surface 103 and the insulating top surface 2201, it is ensured that the insulating top surface 2201 can still effectively protrude from the flange top surface 103 after the flange structure 11 is riveted, thus avoiding the shortening of the creepage distance due to insufficient height and maintaining reliable insulation performance; by limiting the upper limit of the height difference D, it is prevented that the insulating part 22 is too high and will interfere with external parts during the assembly process, while ensuring the overall compactness of the structure.

[0033] For example, in this embodiment, the value of D can be 0.01 or 0.03 or 0.05 or 0.1 or 0.3 or 0.42 or 0.51 or 0.64 or 0.7 or 0.8 or 0.85 or 1, or it can be any range formed by any two of the above values.

[0034] In some embodiments, along a direction parallel to the first surface 104 of the cover plate, the insulating member 22 forms an insulating inner surface 2202 on the side near the top surface 213 of the pole post. The flange structure 11 includes an extension 111 extending outward from the first surface 104 of the cover plate in a direction perpendicular to the first surface 104 of the cover plate, and a pressing part 112 extending from one end of the extension 111 away from the first surface 104 of the cover plate in a direction parallel to the first surface 104 of the cover plate. Along the direction parallel to the first surface 104 of the cover plate, the pressing part 112 forms a flanged inner side 102 on the side near the pole module 2. The maximum distance between the insulating inner side 2202 and the flanged inner side 102 is C, in mm, which satisfies: 0.4≤C≤5.

[0035] The flange structure 11 has an avoidance state and a pressing state. When the flange structure 11 is in the avoidance state, the pole post module 2 can be smoothly inserted into the pole post mounting hole 12. By applying pressure to the flange structure 11 through a riveting device, it changes from the avoidance state to the pressing state, thereby firmly fixing the pole post module 2 at the pole post mounting hole 12. In the pressing state, the flange structure 11 includes an extension 111 and a pressing part 112, wherein the pressing part 112 forms an inner flange surface 102 on the side facing the pole post module 2, and the inner flange surface 102 is the side of the flange structure 11 closest to the pole post 21.

[0036] The insulating component 22 can be injection molded onto the outer periphery of the electrode post 21, ensuring a gap-free fit between it and the electrode post 21. The side of the insulating component 22 near the top surface 213 of the electrode post forms an insulating inner surface 2202, which, in conjunction with the attached... Figure 5 It can be seen that this position is the edge of the pole post 21 near the flange structure 11.

[0037] By limiting the lower limit of the maximum distance C between the inner insulating surface 2202 and the inner flange surface 102, it is ensured that the flange structure 11 and the pole post 21 have a necessary insulating gap in the pressed state, thereby effectively preventing breakdown or short circuit caused by too small a distance; at the same time, by limiting the upper limit of the distance C, the problem of loose structure or unstable fixation caused by too large a distance between the flange structure 11 and the pole post 21 is avoided, and the excessive space occupied is avoided to affect the current flow area of ​​the top surface 213 of the pole post is also avoided.

[0038] For example, in this embodiment, the value of C can be 0.4 or 0.5 or 0.6 or 0.64 or 0.85 or 1 or 1.2 or 1.5 or 2 or 2.5 or 3 or 3.5 or 4 or 4.5 or 5, or it can be any range formed by any two of the above values.

[0039] In some embodiments, the creepage distance between the flange structure 11 and the pole post 21 is 0.5mm-10mm.

[0040] In this embodiment, combined with Figure 5 It is known that the creepage distance is the shortest path length along the surface of the insulating component 22 from the pole 21 to the inner side 102 of the flange. By limiting the lower limit of the creepage distance, safety requirements are ensured to be met, and surface discharge under high voltage conditions is effectively prevented; at the same time, by controlling the upper limit of the creepage distance, excessive structural redundancy is avoided, which would affect space utilization. By rationally designing the relative position and dimensional matching between the flange structure 11 and the insulating component 22, sufficient creepage distance is maintained even in the pressed state.

[0041] For example, the creepage distance can be 0.5mm, 1.2mm, 2.0mm, 3.5mm, 5.0mm, 6.8mm, 8.0mm or 10.0mm, or it can be a range between any two of the above values.

[0042] In some embodiments, along a direction perpendicular to the first surface 104 of the cover plate, the insulating member 22 forms an insulating top surface 2201 on the side near the top surface 213 of the pole post; the top surface 213 of the pole post is disposed above the insulating top surface 2201.

[0043] In this embodiment, the insulating component 22 can be injection molded onto the outer periphery of the electrode post 21. During the injection molding process, the position of the insulating top surface 2201 is precisely controlled by the mold, causing the electrode post top surface 213 to protrude relatively. This prevents the insulating material from overflowing and covering the electrode post top surface 213 during injection molding, ensuring that the conductive parts are exposed and controllable, facilitating subsequent connection with external circuits. This ensures that the current is mainly transmitted through the metal contact during electrical connection, improving conductivity reliability. Furthermore, it prevents the insulating component 22 from being too high and hindering a reliable connection between the electrode post 21 and the external conductor during assembly.

[0044] In some embodiments, the height difference between the top surface 213 of the pole post and the top surface 2201 of the insulation is G, in mm, and satisfies: 0.3≤G≤1.

[0045] By limiting the lower limit of the height difference G between the top surface 213 of the pole post and the top surface 2201 of the insulation, the top surface 213 of the pole post is fully exposed, effectively preventing the insulation material from covering the conductive area and ensuring the reliability of the electrical connection. At the same time, by controlling the upper limit of G, it is prevented that the height difference is too large, which would weaken the covering effect of the insulation component 22 on the pole post 21 and affect the sealing performance and insulation protection effect.

[0046] In some embodiments, the insulating member 22 is provided with a relief hole 223, and the top surface 213 of the pole post is adapted to pass through the relief hole 223; In the direction perpendicular to the first surface 104 of the cover plate, the area of ​​the clearance hole 223 is larger than the area of ​​the top surface 213 of the pole post.

[0047] As a variation, the insulating component 22 can also be fixed to the pole post 21 by molding it separately and then assembling it.

[0048] By reserving a clearance hole 223, it is ensured that the top surface 213 of the electrode post can smoothly pass through the insulating component 22 and be exposed to the outside, facilitating a stable connection with the conductive component. The area of ​​the clearance hole 223 is larger than the area of ​​the top surface 213 of the electrode post to ensure a certain tolerance space during assembly, avoiding the possibility that the top surface 213 of the electrode post cannot be accurately aligned with the clearance hole 223 due to processing errors or assembly deviations, thereby affecting the reliability of the connection.

[0049] In some embodiments, the minimum distance between the edge of the relief hole 223 and the edge of the top surface 213 of the pole post of the insulating member 22 is F, in mm, and satisfies: 0.2≤F≤1.

[0050] In some embodiments, the pole post 21 and the insulating element 22 are integrally injection molded.

[0051] By integrally injection molding the terminal post 21 and the insulating component 22, the tightness of the connection between the insulating component 22 and the terminal post 21 can be improved, the stability and sealing performance of the overall structure can be enhanced, and the insulating component 22 can be prevented from loosening or falling off due to vibration or external force during use, thereby affecting the reliability of the battery.

[0052] In some embodiments, combined with Figure 7 As shown, a clearance groove 224 is formed between two adjacent insulating step portions 222. By forming a clearance groove 224 between two adjacent insulating step portions 222, the creepage distance between the pole post 21 and the cover plate body 1 can be further increased, improving insulation performance and safety factor, and avoiding the risk of short circuit due to insufficient creepage distance.

[0053] The clearance groove 224 can also effectively reduce stress concentration between the insulating component 22 and the cover plate body 1, and prevent deformation caused during injection molding or assembly from affecting structural stability.

[0054] In some embodiments, the opening of the clearance groove is oriented toward the top surface of the pole post.

[0055] By setting the opening of the clearance groove towards the top surface of the pole, it helps to guide the insulating parts into place smoothly during the assembly process, reducing assembly resistance.

[0056] In some embodiments, the pole post 21 includes a limiting portion 211, which is disposed corresponding to the abutment portion 221 and is used to support the abutment portion 221.

[0057] The limiting part 211 formed on the pole post 21 is used to support the abutment part 221. Through the cooperation between the limiting part 211 and the abutment part 221, the insulating component 22 is accurately positioned in the axial direction, preventing it from sliding or moving along the pole post 21. At the same time, the mating surfaces of the limiting part 211 and the abutment part 221 are tightly fitted, effectively transmitting assembly pressure, ensuring the stability of the insulating component 22 during assembly, and further improving the reliability and sealing of the overall structure.

[0058] In some embodiments, the pole post 21 further includes a transition portion 212, which connects the limiting portion 211 and the top surface 213 of the pole post. The transition portion 212 is configured as a stepped structure.

[0059] To facilitate the formation of a stepped structure in the area between the top surface 103 of the flange and the top surface 213 of the pole post, the pole post 21 is provided with a stepped structure. This allows the insulating component 22 to be stably positioned along the stepped surface during injection molding, effectively preventing displacement or tilting, and ensuring the stability of the stepped structure, thereby guaranteeing the insulation performance.

[0060] In some embodiments, the stepped structure of the transition portion 212 includes at least two interconnected stepped surfaces.

[0061] To accommodate the number of insulating step portions 222, the step-like structure of the transition portion 212 includes at least two interconnected step surfaces, each step surface correspondingly supporting an insulating step portion 222, thereby achieving multi-level positioning and stable support, and improving the structural stability of the insulating component 22 during injection molding and assembly.

[0062] In some embodiments, the cover plate body 1 further includes a support portion 13, which is disposed around the pole mounting hole 12 and located on the side of the flange structure 11 facing the pole mounting hole 12. The support portion 13 is adapted to support the pole module 2 in a direction perpendicular to the first surface 104 of the cover plate.

[0063] By providing a support portion 13 around the pole post mounting hole 12, and with the support portion 13 located on the side of the flange structure 11 facing the pole post mounting hole 12, the support portion 13 can provide stable support for the limiting portion 211 of the pole post 21, thereby enhancing the installation stability of the pole post 21 on the cover plate body 1.

[0064] It should be noted that the cover plate body 1 of this application can form the support part 13 by means of extrusion or casting during the processing and forming stage. In this embodiment, extrusion molding process is preferred to improve production efficiency and ensure the structural accuracy of the support part 13.

[0065] In some embodiments, the insulating member 22 is at least partially located between the support portion 13 and the limiting portion 211.

[0066] By positioning the insulating component 22 at least partially between the support portion 13 and the limiting portion 211, an effective clamping effect can be formed during assembly, further limiting the axial displacement of the insulating component 22 and improving its installation reliability. Simultaneously, the support portion 13 and the limiting portion 211 work together to create a uniform pressure distribution on the insulating component 22, preventing deformation or damage to the insulating component 22 due to localized stress concentration, thereby ensuring the stability of its insulation performance.

[0067] In addition, the insulating component 22 can also form an insulating barrier between the support portion 13 and the limiting portion 211, thereby improving the safety of the overall structure.

[0068] In some embodiments, combined with Figure 6As shown, along the direction perpendicular to the first surface 104 of the cover plate, the thickness of the insulating member 22 located between the support part 13 and the limiting part 211 is E, in mm, and satisfies: 0.2≤E≤0.75.

[0069] By limiting the lower limit of the thickness E of the insulating member 22 located between the support part 13 and the limiting part 211, it can be ensured that the insulating member 22 has sufficient insulation performance and mechanical strength, effectively preventing breakdown or breakage; by limiting the upper limit of the thickness E, excessive assembly stress or wasted space due to excessive material thickness is avoided, thereby achieving a compact structural design while ensuring safety.

[0070] For example, in this embodiment, the value of E can be 0.2 or 0.3 or 0.42 or 0.51 or 0.64 or 0.7 or 0.75, or it can be any range formed by any two of the above values.

[0071] According to an embodiment of this application, another aspect provides a battery, comprising: shell; And a cover plate assembly as described above is disposed on the outer casing, the outer casing and the cover plate assembly enclosing and forming a receiving cavity; The battery cell is disposed within the housing cavity and has tabs formed on it. The tabs are electrically connected to the poles 21 of the cover plate assembly.

[0072] The battery of this application, by employing the aforementioned cover plate assembly, can effectively improve the stability of the terminal post installation and the assembly reliability of the insulation components, thereby enhancing the overall structural safety and insulation performance of the battery. The battery of this application also features good production efficiency and assembly precision, meeting the requirements of high energy density and high safety, and is suitable for fields such as new energy vehicles and energy storage systems, improving the battery's stability and reliability under complex operating conditions.

[0073] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by this application.

Claims

1. A cover assembly, characterized by include: The cover plate body (1) has an electrode mounting hole (12). The cover plate body (1) includes a cover plate first surface (104) and a flange structure (11) formed by extending at least part of the cover plate first surface (104) outward and bending towards the electrode mounting hole (12). The flange structure (11) is arranged around the electrode mounting hole (12). The pole module (2) is disposed in the pole mounting hole (12). The pole module (2) includes a pole (21) and an insulating component (22). The insulating component (22) is disposed between the pole (21) and the flange structure (11). The pole (21) includes a pole top surface (213) suitable for electrical connection with an external structure. Along a direction perpendicular to the first surface (104) of the cover plate, the flange structure (11) forms a flange top surface (103) on the side away from the first surface (104) of the cover plate. Along a direction perpendicular to the first surface (104) of the cover plate, the insulating member (22) is at least partially higher than the top surface (103) of the flange, and the region of the insulating member (22) between the top surface (103) of the flange and the top surface (213) of the pole forms a stepped structure.

2. The cover plate assembly of claim 1, wherein, Along a direction perpendicular to the first surface (104) of the cover plate, the insulating member (22) has an abutting portion (221) that abuts against the flange structure (11), and at least one insulating step portion (222) extending from the abutting portion (221) toward the top surface (213) of the pole post.

3. The cover plate assembly according to claim 2, characterized in that, The number of the insulating stepped portions (222) is greater than or equal to two.

4. The cover plate assembly of claim 1, wherein, Along a direction perpendicular to the first surface (104) of the cover plate, the insulating member (22) forms an insulating top surface (2201) on the side near the top surface (213) of the pole post. The height difference between the flanged top surface (103) and the insulating top surface (2201) is D, in mm, and satisfies: 0.01≤D≤1.

5. The cover plate assembly of claim 1, wherein, Along a direction parallel to the first surface (104) of the cover plate, the insulating member (22) forms an insulating inner surface (2202) on the side near the top surface (213) of the pole post. The flange structure (11) includes an extension (111) extending outward from the first surface (104) of the cover plate in a direction perpendicular to the first surface (104) of the cover plate, and a pressing portion (112) extending from one end of the extension (111) away from the first surface (104) of the cover plate in a direction parallel to the first surface (104) of the cover plate. Along the direction parallel to the first surface (104) of the cover plate, the pressing part (112) near the pole module (2) forms a flanged inner side (102), and the maximum distance between the insulating inner side (2202) and the flanged inner side (102) is C, in mm, which satisfies: 0.4≤C≤5.

6. The cover plate assembly according to claim 1, characterized in that, The creepage distance between the flange structure (11) and the pole post (21) is 0.5mm-10mm.

7. The cover plate assembly of claim 1, wherein, Along a direction perpendicular to the first surface (104) of the cover plate, the insulating member (22) forms an insulating top surface (2201) on the side near the top surface (213) of the pole post; the top surface (213) of the pole post is set higher than the insulating top surface (2201).

8. The cover plate assembly of claim 7, wherein, The height difference between the top surface (213) of the pole post and the top surface (2201) of the insulation is G, in mm, and satisfies: 0.3≤G≤1.

9. The cover plate assembly of claim 1, wherein, The insulating component (22) has a clearance hole (223), and the top surface (213) of the pole post is adapted to pass through the clearance hole (223); In a direction perpendicular to the first surface (104) of the cover plate, the area of ​​the clearance hole (223) is greater than the area of ​​the top surface (213) of the pole post.

10. The cover plate assembly of claim 9, wherein, The minimum distance between the edge of the insulating element (22) and the edge of the top surface (213) of the pole post is F, in mm, and satisfies: 0.2≤F≤1.

11. The cover plate assembly of any one of claims 1 to 10, wherein, The pole (21) and the insulating component (22) are integrally injection molded.

12. The cover plate assembly according to claim 3, characterized in that, A clearance groove (224) is formed between two adjacent insulating step portions (222).

13. The cover plate assembly of claim 12, wherein, The opening of the clearance groove (224) is oriented toward the top surface (213) of the pole post.

14. The cover plate assembly of claim 3, wherein, The pole post (21) includes a limiting part (211), which is provided corresponding to the abutting part (221) and is used to support the abutting part (221).

15. The cover plate assembly of claim 14, wherein, The pole post (21) also includes a transition section (212), which connects the limiting section (211) and the top surface (213) of the pole post. The transition section (212) is constructed as a stepped structure.

16. The cover plate assembly of claim 15, wherein, The stepped structure of the transition section (212) includes at least two interconnected stepped surfaces.

17. The cover plate assembly of claim 14, wherein, The cover plate body (1) also includes a support (13), which is arranged around the pole mounting hole (12) and located on the side of the flange structure (11) facing the pole mounting hole (12). The support (13) is adapted to support the pole module (2) in a direction perpendicular to the first surface (104) of the cover plate.

18. The cover plate assembly of claim 17, wherein, The insulating element (22) is at least partially located between the support portion (13) and the limiting portion (211).

19. The cover plate assembly of claim 18, wherein, Along the direction perpendicular to the first surface (104) of the cover plate, the thickness of the insulating member (22) located between the support (13) and the limiting part (211) is E, in mm, and satisfies: 0.2≤E≤0.

75.

20. A battery, characterized by include: shell; And a cover plate assembly as described in any one of claims 1 to 19, which is disposed on the housing, wherein the housing and the cover plate assembly enclose a receiving cavity; A battery cell is disposed within the receiving cavity, and the battery cell has tabs formed thereon, which are electrically connected to the pole (21) of the cover plate assembly.

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