Cover plate structure and battery

Abstract

The application relates to the battery technical field and discloses a cover plate structure and a battery. The cover plate structure comprises: a plate body, which is provided with a pole mounting hole; a cantilever part is arranged around the pole mounting hole; a pole assembly is mounted in the pole mounting hole and abuts against the cantilever part; the surface of the cantilever part for supporting the pole assembly is a first surface of the cantilever part; the surface of the plate body on the same side of the first surface of the cantilever part is a first surface of the plate body; and the first surface of the cantilever part is lower than the first surface of the plate body in the direction perpendicular to the first surface of the plate body, thereby forming a staggered structure. The cover plate structure provided by the application realizes the thinning of the thickness of the cantilever part by making the first surface of the cantilever part lower than the first surface of the plate body, thereby reducing the material consumption in the forming process of the cantilever part, avoiding the uneven flow of the material in the extrusion forming process, and ensuring the uniform thickness of the cantilever part.

Description

Technical Field

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

[0002] Battery covers typically have mounting holes for terminals. Taking terminal crimping as an example, to facilitate pre-positioning of the terminals, the battery cover usually has a support structure around the terminal mounting holes to support and position the terminals, facilitating subsequent crimping operations.

[0003] However, during the molding process, the support structure is usually formed by extruding the battery cover plate. However, since the support structure requires a lot of material, the material used to form the support structure is relatively small, which can easily lead to uneven thickness of the support structure, affecting the strength and sealing of the cover plate. Utility Model Content

[0004] In view of this, this application provides a cover plate structure and a battery to solve the problem that uneven thickness is easy to occur during extrusion molding of the support structure due to the large amount of material used.

[0005] In a first aspect, this application provides a cover plate structure, comprising: The plate body has pole mounting holes, and the plate body has a cantilever section around the pole mounting holes. The pole assembly is installed in the pole mounting hole and abuts against the cantilever part; The surface of the cantilever section used to support the pole assembly is the first surface of the cantilever section, and the surface of the plate body located on the same side as the first surface of the cantilever section is the first surface of the plate body. In the direction perpendicular to the first surface of the plate body, the first surface of the cantilever section is lower than the first surface of the plate body to form a staggered structure.

[0006] Beneficial effects: The cover plate structure of this application reduces the thickness of the cantilever portion by making the first surface of the cantilever portion lower than the first surface of the plate body. This reduces the amount of material used during the forming process of the cantilever portion, allows for effective material distribution, avoids uneven material flow during extrusion molding, ensures uniform thickness of the cantilever portion, improves the forming quality of the cantilever portion, ensures the overall strength and sealing performance of the cover plate structure, and thus enhances the overall safety of the battery.

[0007] Secondly, this application also provides a battery, comprising: shell; And a cover plate structure as described above is provided on the outer shell, the outer shell and the cover plate structure enclosing and forming a receiving cavity; The battery cell is disposed within a housing cavity and has tabs formed on it. The tabs are electrically connected to the terminal assembly of the cover plate structure.

[0008] Since the battery includes a cover structure, it has the same effect as the cover structure, so it will not be elaborated 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 a schematic diagram of the cover plate structure of this application; Figure 2 This is an exploded view of the cover plate structure of this application; Figure 3 This is a partially enlarged view of the exploded state of the cover plate structure in this application; Figure 4 This is a top view of the cover plate structure of this application; Figure 5 for Figure 4 Schematic diagram of the BB section; Figure 6 for Figure 5 A schematic diagram of the decomposition process; Figure 7 This is a cross-sectional view of another type of plate body.

[0011] Explanation of reference numerals in the attached figures: 1. Plate body; 11. Pole post mounting hole; 12. Cantilever section; 13. Flanged section; 14. Explosion-proof valve opening; 15. Reinforcing rib; 2. Terminal assembly; 21. Terminal body; 211. Overlapping part; 22. Terminal insulation component; 23. Terminal sealing ring; 101. First surface of the plate body; 102. Second surface of the plate body; 121. First surface of the cantilever portion; 122. Second surface of the cantilever portion; 3. Lower plastic; 4. Explosion-proof valve. 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] As an important component of the battery, the battery cover is usually fitted with terminals to connect the internal and external circuits of the battery.

[0017] There are several ways to install the terminals. Among them, the flanged riveting installation is used to facilitate the pre-positioning of the terminals. The battery cover usually has a support structure around the terminal mounting holes to support and position the terminals. This ensures that the terminals can be accurately aligned with the mounting holes during the riveting process, thereby avoiding installation deviations and ensuring a secure installation between the terminals and the battery cover.

[0018] However, in the manufacturing process of battery covers, the support structure is typically formed by extrusion molding of the battery cover. Because the support structure requires a large amount of material, while the material used for extrusion is relatively small, it's difficult to achieve a uniform thickness distribution during molding. Uneven thickness not only affects the overall strength of the battery cover but can also lead to decreased sealing performance, potentially causing safety hazards such as battery leakage and short circuits. This is especially true for non-circular terminals, where the corresponding support structure design is more complex, and the uneven thickness problem is more pronounced during molding, directly affecting the contact stability between the terminal and the cover and increasing installation difficulty.

[0019] The following is combined with Figures 1 to 7 This describes an embodiment of the present application.

[0020] According to embodiments of this application, in one aspect, a cover plate structure is provided, comprising: The plate body 1 has a pole mounting hole 11, and the plate body 1 has a cantilever part 12 around the pole mounting hole 11. The pole assembly 2 is installed in the pole mounting hole 11 and abuts against the cantilever part 12; The surface of the cantilever 12 that supports the pole assembly 2 is the first surface 121 of the cantilever, and the surface of the plate body 1 located on the same side as the first surface 121 of the cantilever is the first surface 101 of the plate body. In the direction perpendicular to the first surface 101 of the plate body, the first surface 121 of the cantilever is lower than the first surface 101 of the plate body to form a staggered structure.

[0021] The plate body 1 of this application has pole mounting holes 11. By setting cantilever part 12, the pole assembly 2 can be in close contact with the first surface 121 of the cantilever part during the installation process, and the cantilever part 12 provides good support for the pole assembly 2.

[0022] It should be noted that the cantilever portion 12 of the plate body 1 in this application can be formed by extrusion or casting during the processing and forming stage. In this embodiment, extrusion molding is preferred to improve production efficiency and ensure the structural accuracy of the cantilever portion 12. During the extrusion molding process, since the material used to extrude and form the cantilever portion 12 is relatively small, in order to avoid the thickness difference problem caused by uneven material distribution during the forming process, this application reasonably sets the structural shape and size parameters of the cantilever portion 12 so that the material can be evenly distributed during the forming process, thereby effectively improving the thickness uniformity of the cantilever portion 12.

[0023] Correspondingly, the mold structure for extruding the cantilever section 12 has also been adapted and optimized to facilitate material flow control, enabling the cantilever section 12 to be formed uniformly and improving its forming accuracy. Furthermore, the mold design incorporates a reasonable flow divider and guiding structure, further enhancing material flowability during extrusion and reducing internal stress during forming, thus better ensuring the structural uniformity and stability of the cantilever section 12.

[0024] Thus, during the forming process of the cantilever 12, high-quality forming of the cantilever 12 can be achieved without increasing the amount of material used, further reducing production costs.

[0025] The cover plate structure of this application reduces the thickness of the cantilever portion 12 by making the first surface 121 of the cantilever portion lower than the first surface 101 of the plate body. This reduces material usage during the forming process of the cantilever portion 12, allowing for effective material distribution and preventing uneven material flow during extrusion molding. This ensures uniform thickness of the cantilever portion 12, improves its forming quality, and enhances the overall strength and sealing performance of the cover plate structure, thereby improving the overall safety of the battery. This not only strengthens the support stability of the cantilever portion 12 for the terminal assembly 2 but also improves the installation accuracy of the terminal assembly 2 during installation, reducing the risk of installation deviations caused by uneven thickness of the support structure.

[0026] In some embodiments, in a direction perpendicular to the first surface 101 of the plate body, the height difference between the first surface 121 of the cantilever portion and the first surface 101 of the plate body is H1, in mm, and satisfies: 0.2≤H1≤2.0.

[0027] By controlling the height difference H1 within this range, the relationship between the thinning effect of the cantilever portion 12 and the structural strength can be effectively balanced. This ensures the reliable support of the cantilever portion 12 for the pole assembly 2 while avoiding insufficient structural strength due to excessive thinning. Furthermore, controlling the height difference H1 can further optimize the material flow state during the extrusion molding process, improving molding uniformity and thus ensuring the thickness consistency and structural stability of the cantilever portion 12.

[0028] For example, in this embodiment, the value of H1 can be 0.2 or 0.5 or 0.8 or 1 or 1.2 or 1.3 or 1.5 or 1.6 or 1.8 or 2.0, or it can be a range formed by any two of the above values.

[0029] In some embodiments, the thickness of the cantilever portion 12, in the direction perpendicular to the first surface 101 of the plate body, is T, in mm, and satisfies: 0.6≤T≤1.8.

[0030] By controlling the thickness T of the cantilever portion 12 within this range, the structural strength and lightweight design requirements of the cantilever portion 12 can be effectively balanced. This ensures its bending resistance under stress while avoiding unnecessary material consumption due to excessive thickness. Furthermore, controlling the thickness T of the cantilever portion 12 within the aforementioned range also facilitates its forming, improves material flowability during extrusion molding, and further ensures the forming quality and structural uniformity of the cantilever portion 12.

[0031] For example, in this embodiment, the value of T can be 0.6, 0.7, 0.8, 1, 1.2, 1.3, 1.5, 1.6, or 1.8, or it can be any range formed by any two of the above values.

[0032] In some embodiments, in the direction perpendicular to the first surface 101 of the plate body, the thickness of the cantilever portion 12 is T in mm, and the thickness of the plate body 1 is S in mm, satisfying: 0.3≤T / S≤0.7.

[0033] By controlling the T / S ratio within this range, the thickness matching between the cantilever portion 12 and the plate body 1 can be effectively achieved. This ensures the structural support strength of the cantilever portion 12 while avoiding the increase in overall weight and material waste caused by excessive thickness. It also further optimizes the mechanical property matching relationship between the cantilever portion 12 and the plate body 1, giving it good stress distribution characteristics under stress. Simultaneously, reasonable control of the T / S ratio also helps optimize the material flow distribution during molding, improves the uniformity of extrusion molding, and ensures the connection strength and structural consistency between the cantilever portion 12 and the plate body 1.

[0034] For example, in this embodiment, the value of T / S can be 0.3, 0.4, 0.5, 0.6, or 0.7, or it can be a range formed by any two of the above values. A specific value within this ratio range is selected.

[0035] In some embodiments, along the direction of the first surface 101 of the plate body, the area of ​​the cantilever portion 12 protruding relative to the plate body 1 is V, in mm. 2 , satisfying: 80≤V≤600.

[0036] By controlling the protruding area V of the cantilever portion 12 within this range, the structural stability and functional adaptability of the cantilever portion 12 can be effectively ensured. This avoids the cantilever portion 12's support effect on the pole assembly 2 being affected by an excessively small protruding area, while also preventing insufficient rigidity of the cantilever portion 12 due to an excessively large area, thus avoiding a decrease in overall structural strength and preventing the risk of deformation or breakage. Simultaneously, by controlling the protruding area V of the cantilever portion 12 within the suitable range, the material usage of the cantilever portion 12 can be reasonably controlled, avoiding uneven material distribution caused by excessive protrusion, thereby effectively ensuring the thickness uniformity of the cantilever portion 12. This reduces the molding difficulty of the cantilever portion 12 and improves its yield rate during processing.

[0037] For example, in this embodiment, the value of V can be 80, 100, 150, 300, 400, 500, or 600, or it can be any range formed by any two of the above values.

[0038] In some embodiments, the pole assembly 2 includes a pole body 21; the projected area of ​​the pole body 21 in the direction perpendicular to the first surface 101 of the plate body is W, in mm. 2 It satisfies: 120≤W≤1800, and also satisfies: 0.1≤V / W≤0.7.

[0039] By controlling the V / W ratio within this range, the dimensional matching between the cantilever portion 12 and the pole body 21 can be ensured. This allows the cantilever portion 12 to effectively support the pole body 21, avoiding a situation where the cantilever portion 12 has a large protruding area while the projected area of ​​the pole body 21 is small due to an excessively large ratio, thus preventing wasted support area. Conversely, a situation where the pole body 21 has an excessively large projected area while the cantilever portion 12 has a small protruding area can also be avoided, leading to unstable support or stress concentration. Reasonably controlling the V / W ratio helps achieve a uniform distribution of structural forces, optimizes the utilization of assembly space, and avoids installation interference or assembly difficulties caused by dimensional imbalance between the cantilever portion 12 and the pole body 21. Furthermore, while meeting support requirements, the protruding area of ​​the cantilever portion 12 is minimized as much as possible, reducing the molding difficulty of the cantilever portion 12.

[0040] For example, in this embodiment, the value of V / W can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or 0.7, or it can be a range formed by any two of the above values.

[0041] In some embodiments, along the direction of the first surface 101 of the plate body, the length of the cantilever portion 12 protruding relative to the plate body 1 is D, in mm, and satisfies: 1.5≤D≤5.

[0042] By controlling the protruding length D of the cantilever 12 within this range, the supporting effect of the cantilever 12 on the electrode body 21 can be effectively ensured, while avoiding the cantilever 12 being too long and affecting the connection space between the electrode body 21 and the internal structure of the battery.

[0043] For example, in this embodiment, the value of the protrusion length D of the cantilever portion 12 can be 1.5 or 1.8 or 2.2 or 2.5 or 3.0 or 3.5 or 4.0 or 5, or it can be a range formed by any two of the above values.

[0044] In some embodiments, the surface of the cantilever portion 12 opposite to the first surface 121 of the cantilever portion is the second surface 122 of the cantilever portion, and the second surface 122 of the cantilever portion is parallel to the first surface 121 of the cantilever portion; The surface of the plate body 1 opposite to the first surface 101 of the plate body is the second surface 102 of the plate body, and the second surface 102 of the plate body is parallel to the first surface 101 of the plate body. In a direction perpendicular to the first surface 101 of the plate body, the second surface 122 of the cantilever portion is higher than the second surface 102 of the plate body, forming a staggered structure.

[0045] By making the second surface 122 of the cantilever portion higher than the second surface 102 of the plate body to form a staggered structure, the thickness of the cantilever portion 12 can be further optimized, thereby reducing the thickness of the cantilever portion 12. This reduces the amount of material used during the forming process of the cantilever portion 12, allows for effective material distribution, avoids uneven material flow during extrusion molding, ensures uniform thickness of the cantilever portion 12, and improves the forming quality of the cantilever portion 12.

[0046] In some embodiments, in a direction perpendicular to the first surface 101 of the plate body, the height difference between the second surface 122 of the cantilever portion and the second surface 102 of the plate body is H2, in mm, satisfying: -1≤H2≤1.

[0047] First, when the value of H2 is within the range of 0 ≤ H2 ≤ 1, controlling the height difference H2 within this range allows for adjustment of the misalignment between the cantilever portion 12 and the plate body 1, thereby optimizing material distribution and the stability of the molding process. If the height difference H2 is too large, it may cause the cantilever portion 12 to warp or deform during the molding process, affecting structural strength and assembly accuracy. Reasonably controlling the range of H2 helps to reduce material waste while improving the molding quality and structural reliability of the cantilever portion 12.

[0048] Secondly, as another form of deformation, the value of H2 can also be in the range of -1 ≤ H2 < 0. In this case, the second surface 122 of the cantilever portion can protrude from the second surface 102 of the plate body on the side away from the first surface 101 of the plate body, so as to meet the arrangement requirements of various structural forms. At this time, the thickness T of the cantilever portion 12 can still be kept in the range of 0.6 ≤ T ≤ 1.8, which is beneficial to the forming of the cantilever portion 12. By moving the first surface 121 of the cantilever portion away from the first surface 101 of the plate body, the relative positional relationship between the cantilever portion 12 and the plate body 1 can be reasonably controlled, and the structural stability and uniformity of the cantilever portion 12 during the forming process can be guaranteed.

[0049] For example, in this embodiment, the value of H2 can be -1 or -0.8 or -0.5 or 0 or 0.2 or 0.3 or 0.5 or 0.6 or 0.8 or 1, or it can be a range formed by any two of the above values.

[0050] In some embodiments, combined with Figure 7 As shown, the first surface 121 of the cantilever is parallel to the first surface 101 of the plate body; The surface of the plate body 1 opposite to the first surface 101 of the plate body is the second surface 102 of the plate body, and the second surface 102 of the plate body is parallel to the first surface 101 of the plate body. The surface of the cantilever portion 12 opposite to the first surface 121 of the cantilever portion is the second surface 122 of the cantilever portion, and the second surface 122 of the cantilever portion is inclined relative to the first surface 121 of the cantilever portion.

[0051] By tilting the second surface 122 of the cantilever portion relative to the first surface 121 of the cantilever portion, the dimensional parameters of the cantilever portion 12 can be further optimized, achieving localized thickness reduction. This reduces material usage during the forming process of the cantilever portion 12, ensuring effective material distribution and preventing uneven material flow during extrusion molding. It also ensures the uniformity of the thickness of the first surface 121 of the cantilever portion 12, improving the forming quality of the cantilever portion 12. Furthermore, tilting the second surface 122 relative to the first surface 121 also improves material flow during molding, allowing for more uniform filling of the mold cavity during extrusion. This reduces localized stress concentration and enhances the structural strength and dimensional stability of the cantilever portion 12.

[0052] In some embodiments, in a direction perpendicular to the first surface 101 of the plate body, the thickness of the cantilever portion 12 on the side away from the pole mounting hole 11 is greater than the thickness of the cantilever portion 12 on the side close to the pole mounting hole 11.

[0053] In this embodiment, the thickness of the cantilever portion 12 on the side furthest from the pole mounting hole 11 is designed to be larger, enabling this part to provide stronger support and bending resistance under stress, thereby improving the stability and reliability of the overall structure. This allows for the rational use of materials while ensuring structural strength, reducing unnecessary material accumulation and optimizing the molding process.

[0054] In some embodiments, combined with Figure 7 As shown, the second surface 122 of the cantilever portion is also provided with reinforcing ribs 15.

[0055] By providing reinforcing ribs 15 on the second surface 122 of the cantilever, the overall rigidity and deformation resistance of the cantilever 12 can be further improved. In particular, when subjected to external loads or assembly stress, it can effectively disperse stress distribution and prevent structural failure caused by local stress concentration.

[0056] The reinforcing rib 15 can be in the form of raised ribs or grooves. Its shape, quantity and distribution position can be optimized according to the actual stress of the cantilever 12 to achieve the best reinforcement effect.

[0057] Meanwhile, when the reinforcing rib 15 is a groove, it can also improve the material filling effect of the cantilever 12 during the molding process, reduce the amount of material used in the cantilever 12, and help improve the consistency and pass rate of the product.

[0058] In some embodiments, a plurality of reinforcing ribs 15 are provided circumferentially around the cantilever portion 12.

[0059] In some embodiments, combined with Figure 7 As shown, the tilt angle of the second surface 122 of the cantilever relative to the first surface 121 of the cantilever is β, in degrees, which satisfies: 0.01≤β≤10.

[0060] By controlling the tilt angle β within this range, it is possible to ensure the uniformity of material flow during the molding process of the cantilever 12, and also to avoid the problem of reduced structural strength caused by excessive tilt angle.

[0061] In some embodiments, the edge of the pole assembly 2 includes an arc segment.

[0062] In this embodiment, the pole assembly 2 is non-circular, and its edge includes arc segments.

[0063] In some embodiments, the pole assembly 2 is configured as a racetrack-shaped structure, which includes two parallel long sides and two arc-shaped short sides. The pole mounting hole 11 matches the shape of the pole assembly 2.

[0064] By constructing the pole assembly 2 as a racetrack-shaped structure, the dimensions along the length of the plate body 1 can be utilized effectively, increasing the area of ​​the pole assembly 2 and thus improving the current carrying capacity.

[0065] The pole mounting hole 11 matches the shape of the pole assembly 2 to ensure precise positioning and secure connection during assembly.

[0066] In some embodiments, the pole assembly 2 includes a pole body 21, the pole body 21 having an overlap portion 211 formed circumferentially, the overlap portion 211 being adapted to abut against the first surface 121 of the cantilever portion 12.

[0067] By forming an overlap portion 211 in the circumference of the pole body 21, and by utilizing the cooperation between the overlap portion 211 and the first surface 121 of the cantilever portion, a stable support for the pole body 21 is achieved.

[0068] In some embodiments, the pole assembly 2 further includes a pole insulator 22, which is disposed between the pole body 21 and the cantilever portion 12.

[0069] In some embodiments, the pole insulating member 22 is disposed around the outer periphery of the pole body 21.

[0070] By surrounding the pole body 21 with the pole insulation 22, the electrical connection between the pole body 21 and the cantilever 12 can be effectively blocked, thereby improving the insulation performance and safety of the entire pole assembly 2.

[0071] In some embodiments, combined with Figure 3As shown, the plate body 1 also includes a flange portion 13, which is arranged circumferentially around the cantilever portion 12. The flange portion 13 is formed by extending from the first surface 101 of the plate body in a direction perpendicular to the first surface 101 of the plate body, and the end of the flange portion 13 away from the first surface 101 of the plate body is folded toward the side of the cantilever portion 12.

[0072] The flange 13 can limit the position of the terminal assembly 2, preventing it from shifting or loosening after installation, thereby improving the stability and reliability of the overall structure. The flange 13 fits tightly with the terminal assembly 2, further enhancing the assembly's firmness and ensuring that the terminal assembly 2 will not shift or fall off due to external forces during use, further guaranteeing sealing performance and reducing the risk of battery leakage.

[0073] According to an embodiment of this application, another aspect provides a battery, comprising: shell; And a cover plate structure as described above is provided on the outer shell, the outer shell and the cover plate structure enclosing and forming a receiving cavity; The battery cell is disposed in the housing cavity and has tabs formed on it. The tabs are electrically connected to the terminal assembly 2 of the cover plate structure.

[0074] 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 plate structure, characterized in that, include: The plate body (1) has a pole mounting hole (11) on it, and the plate body (1) has a cantilever part (12) around the pole mounting hole (11). The pole assembly (2) is installed in the pole mounting hole (11) and abuts against the cantilever part (12); The surface of the cantilever (12) used to support the pole assembly (2) is the first surface of the cantilever (121), and the surface of the plate body (1) located on the same side as the first surface of the cantilever (121) is the first surface of the plate body (101). In the direction perpendicular to the first surface of the plate body (101), the first surface of the cantilever (121) is lower than the first surface of the plate body (101) to form a staggered structure.

2. The cover plate structure according to claim 1, characterized in that, In the direction perpendicular to the first surface (101) of the plate body, the height difference between the first surface (121) of the cantilever portion and the first surface (101) of the plate body is H1, in mm, and satisfies: 0.2≤H1≤2.

0.

3. The cover plate structure according to claim 1, characterized in that, In the direction perpendicular to the first surface (101) of the plate body, the thickness of the cantilever (12) is T, in mm, and satisfies: 0.6≤T≤1.

8.

4. The cover plate structure according to claim 1, characterized in that, In the direction perpendicular to the first surface (101) of the plate body, the thickness of the cantilever (12) is T in mm, and the thickness of the plate body (1) is S in mm, satisfying: 0.3≤T / S≤0.

7.

5. The cover plate structure according to claim 1, characterized in that, Along the direction of the first surface (101) of the plate body, the area of ​​the cantilever portion (12) protruding relative to the plate body (1) is V, in mm. 2 , satisfying: 80≤V≤600.

6. The cover plate structure according to claim 5, characterized in that, The pole assembly (2) includes a pole body (21); the projected area of ​​the pole body (21) in a direction perpendicular to the first surface (101) of the plate body is W, in mm. 2 The following condition is met: 0.1≤V / W≤0.

7.

7. The cover plate structure according to claim 1, characterized in that, Along the direction of the first surface (101) of the plate body, the length of the cantilever (12) protruding relative to the plate body (1) is D, in mm, and satisfies: 1.5≤D≤5.

8. The cover plate structure according to claim 6, characterized in that, In the direction perpendicular to the first surface (101) of the plate body, the projected area of ​​the pole body (21) is W, in mm. 2 , where W satisfies: 120≤W≤1800.

9. The cover plate structure according to claim 1, characterized in that, The surface of the cantilever (12) opposite to the first surface (121) of the cantilever is the second surface (122) of the cantilever, and the second surface (122) of the cantilever is parallel to the first surface (121) of the cantilever; The surface of the plate body (1) opposite to the first surface (101) of the plate body is the second surface (102) of the plate body, and the second surface (102) of the plate body is parallel to the first surface (101) of the plate body; In a direction perpendicular to the first surface (101) of the plate body, the second surface (122) of the cantilever portion is higher than the second surface (102) of the plate body to form a staggered structure.

10. The cover plate structure according to claim 9, characterized in that, In a direction perpendicular to the first surface (101) of the plate body, the height difference between the second surface (122) of the cantilever portion and the second surface (102) of the plate body is H2, in mm, and satisfies: -1≤H2≤1.

11. The cover plate structure according to claim 1, characterized in that, The first surface (121) of the cantilever portion is parallel to the first surface (101) of the plate body; The surface of the plate body (1) opposite to the first surface (101) of the plate body is the second surface (102) of the plate body, and the second surface (102) of the plate body is parallel to the first surface (101) of the plate body; The surface of the cantilever portion (12) opposite to the first surface (121) of the cantilever portion is the second surface (122) of the cantilever portion, and the second surface (122) of the cantilever portion is inclined relative to the first surface (121) of the cantilever portion.

12. The cover plate structure according to claim 11, characterized in that, In a direction perpendicular to the first surface (101) of the plate body, the thickness of the cantilever portion (12) on the side away from the pole mounting hole (11) is greater than the thickness of the cantilever portion (12) on the side close to the pole mounting hole (11).

13. The cover plate structure according to claim 12, characterized in that, The second surface (122) of the cantilever is also provided with reinforcing ribs (15).

14. The cover plate structure according to claim 13, characterized in that, Multiple reinforcing ribs (15) are arranged circumferentially around the cantilever portion (12).

15. The cover plate structure according to claim 11, characterized in that, The inclination angle of the second surface (122) of the cantilever relative to the first surface (121) of the cantilever is β, in degrees, and satisfies: 0.01≤β≤10.

16. The cover plate structure according to claim 1, characterized in that, The edge of the pole assembly (2) includes arc segments.

17. The cover plate structure according to claim 16, characterized in that, The pole assembly (2) is constructed as a racetrack-shaped structure, which includes two parallel long sides and two arc-shaped short sides. The pole mounting hole (11) matches the shape of the pole assembly (2).

18. The cover plate structure according to claim 1, characterized in that, The pole assembly (2) includes a pole body (21) with an overlap portion (211) formed circumferentially thereon, the overlap portion (211) being adapted to abut against the first surface (121) of the cantilever portion (12).

19. The cover plate structure according to claim 18, characterized in that, The pole assembly (2) also includes a pole insulating member (22), which is disposed between the pole body (21) and the cantilever portion (12).

20. The cover plate structure according to claim 19, characterized in that, The pole insulating element (22) is disposed around the outer periphery of the pole body (21).

21. The cover plate structure according to claim 1, characterized in that, The board body (1) further includes a flange (13), which is arranged circumferentially around the cantilever (12). The flange (13) is formed by extending from the first surface (101) of the board body in a direction perpendicular to the first surface (101) of the board body, and the end of the flange (13) away from the first surface (101) of the board body is folded toward the side of the cantilever (12).

22. A battery, characterized in that, include: shell; And a cover plate structure as described in any one of claims 1 to 21, which is disposed on the outer shell, wherein the outer shell and the cover plate structure enclose a receiving cavity; A battery cell is disposed in the receiving cavity, and the battery cell has tabs formed thereon, which are electrically connected to the pole assembly (2) of the cover plate structure.

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