Cover plate assembly and battery

Abstract

The application relates to the battery technical field and discloses a cover plate assembly and a battery. The cover plate assembly comprises a pole, which is a circle in the vertical direction projection, and the pole comprises an arc segment and a straight line segment; a cover plate body, which is provided with a pole mounting hole and a flange structure; the flange structure comprises a long side segment corresponding to the straight line segment and an arc side segment corresponding to the arc segment, the long side segment and the arc side segment are alternately connected and arranged around the pole mounting hole; in the avoiding state, the curvature of the arc side segment is theta 1, and theta 1=S / R, wherein S is the arc length of the flange inner circumferential surface on the side of the arc side segment facing the pole mounting hole; R is the radius of the flange inner circumferential surface; and 0.9<=theta 1<=3.5 is satisfied. The cover plate assembly provided by the application can uniformly stress the arc side segment of the flange structure in the riveting process, so that the flange structure can uniformly shrink inward in the riveting process, the uneven riveting phenomenon caused by local stress concentration is avoided, and the riveting effect is improved.

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] Battery covers typically have terminal mounting holes and a flange structure formed around the terminal mounting holes. By riveting and deforming the flange structure, the terminal is fixed in the terminal mounting holes, ensuring a firm connection between the terminal and the cover.

[0003] However, for non-circular poles, the corresponding pole mounting holes are usually also non-circular, and the flange structure often needs to be made into a non-circular shape to match. Due to the complexity of the flange structure's cross-sectional shape, it is difficult to distribute the force evenly during the riveting process, which can easily lead to the poles not being securely fixed. Utility Model Content

[0004] In view of this, this application provides a cover plate assembly and a battery to solve the problem that non-circular flange structures are difficult to distribute force evenly during the riveting process, which can easily lead to the insecure fixing of the terminal posts.

[0005] In a first aspect, this application provides a cover plate assembly, comprising: The pole column, when projected vertically, is a unicircle. The pole column consists of two arc segments and a straight segment between the two arc segments. The cover plate body has a pole mounting hole that matches the shape of the pole. The cover plate body has a flange structure around the pole mounting hole. The flange structure has a clearance state to avoid the pole being inserted into the pole mounting hole, and a riveting state to fix the pole. The flange structure can switch from the clearance state to the riveting state under the action of external force. The flange structure includes a long side segment corresponding to the straight segment and an arc side segment corresponding to the arc segment. The long side segment and the arc side segment are alternately connected and arranged around the pole mounting hole. In the avoidance state, the arc length of the arc segment is θ1, and θ1=S / R, where S is the arc length of the inner circumferential surface of the flange on the side of the arc segment facing the pole mounting hole, in mm; and R is the radius of the inner circumferential surface of the flange, in mm. It satisfies: 0.9≤θ1≤3.5.

[0006] Beneficial Effects: The cover plate assembly provided in this application, by limiting the range of the curvature θ1 of the arc segment of the flange structure in the avoidance state, ensures that the arc segment of the flange structure is uniformly stressed during riveting. This allows the flange structure to uniformly contract inward during riveting, avoiding uneven riveting caused by localized stress concentration, thereby improving the riveting effect and ensuring the uniformity of the clamping force between the flange structure and the terminal post after riveting, effectively preventing the problem of insecure terminal post fixation. Simultaneously, by reasonably controlling the range of the curvature θ1 of the arc segment of the flange structure, the material flow is more uniform during riveting, reducing differences in deformation resistance and effectively lowering the risk of damage to the terminal post during riveting, thus improving the overall reliability and safety of the battery cover plate assembly.

[0007] Secondly, this application also 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 terminals of the cover plate assembly.

[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 a top view of the cover plate assembly of this application; Figure 2 This is an exploded view of the cover plate body and the pole post of this application; Figure 3 This is a top view of the pole of this application; Figure 4 This is a top view of the cover plate body before riveting. Figure 5 for Figure 4 Schematic diagram of AA section; Figure 6 This is a top view of the cover plate body after riveting. Figure 7 for Figure 6 A schematic diagram of the BB cross section.

[0011] Explanation of reference numerals in the attached figures: 1. Cover plate body; 11. Pole post mounting hole; 12. Cantilever beam; 13. Flange structure; 131. Extension; 132. Pressing part; 101. First surface of the cover plate; 102. Top surface of the flange; 1301. Long side segment; 1302. Arc side segment; 1303. Outer peripheral surface of flange; 1304. Inner peripheral surface of flange; 1305. Transition segment; 1321. Pressing the inner surface; 2. Pole column; 21. Straight segment; 22. Curved segment; 23. Step section. 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] Battery covers typically have terminal mounting holes and a flange structure formed around the terminal mounting holes. By riveting and deforming the flange structure, the terminal is fixed in the terminal mounting holes, ensuring a firm connection between the terminal and the cover.

[0017] In traditional designs, the electrode post is typically designed in a cylindrical shape, with correspondingly circular mounting holes and a ring-shaped flange structure surrounding these holes. A riveting process is used to plastically deform the ring-shaped flange structure, ensuring uniform stress distribution and effective secure fixing of the electrode post. However, cylindrical electrode posts are prone to insufficient flow area and low flow rate.

[0018] With the diversification of battery designs, the application of non-circular terminals is gradually increasing. For example, terminals can be designed as square, elliptical, monolithic, or polygonal structures to improve the current flow area and current flow rate. Taking the racetrack-shaped terminal as an example, its cross-sectional shape resembles a racetrack, consisting of two circular arc segments and a rectangular segment in the middle. The racetrack-shaped terminal can significantly increase the contact area between the terminal and conductive components, improving the battery's current output capability. However, correspondingly, the shape of the terminal mounting hole and the flange structure also needs to be matched to the racetrack shape.

[0019] Because of the irregular cross-sectional shape of the racetrack-shaped flange structure, the stress distribution during riveting is uneven, which can easily lead to localized stress concentration or insufficient plastic deformation, thus affecting the fixation effect of the pole and causing it to be unstable. Especially when the curvature of the arc segments at both ends of the racetrack-shaped flange structure is large, the pressure applied by the riveting tool is difficult to be evenly transmitted to the entire arc segment, which can easily lead to insufficient pressing force in local areas of the arc segment, creating a hidden danger of unstable pole fixation.

[0020] The following is combined Figures 1 to 7 This describes an embodiment of the present application.

[0021] According to embodiments of this application, in one aspect, a cover plate assembly is provided, comprising: The pole post 2 has a unicircle shape when projected vertically. The pole post 2 includes two arc segments 22 and a straight segment 21 disposed between the two arc segments 22. The cover plate body 1 has an electrode mounting hole 11 that matches the shape of the electrode post 2. The cover plate body 1 has a flange structure 13 around the electrode mounting hole 11. The flange structure 13 has a clearance state that avoids the electrode post 2 from being inserted into the electrode mounting hole 11, and a riveting state that rivets the electrode post 2 to fix it. The flange structure 13 can switch from the clearance state to the riveting state under the action of external force. The flange structure 13 includes a long side segment 1301 corresponding to the straight segment 21 and an arc side segment 1302 corresponding to the arc segment 22. The long side segment 1301 and the arc side segment 1302 are alternately connected and arranged around the pole post mounting hole 11. In the avoidance state, the arc of the arc segment 1302 is θ1, and θ1=S / R, where S is the arc length of the inner circumferential surface 1304 of the flange on the side of the arc segment 1302 facing the pole mounting hole 11, in mm; and R is the radius of the inner circumferential surface 1304 of the flange, in mm. It satisfies: 0.9≤θ1≤3.5.

[0022] It should be noted that the formula for calculating radians is: θ = s / r, where θ is radians; s is the arc length in mm; and r is the radius in mm. Radius θ is a dimensionless quantity and has no unit.

[0023] In this application, the pole post 2 is constructed as a monolithic circle, which is a geometric shape consisting of a rectangle and two semicircles, resembling a standard running track. This shape comprises a central rectangular area and semicircular ends on both sides, and is commonly referred to as a monolithic circle in the industrial field. Additionally, a monolithic circle can also be called a running track shape.

[0024] The cover plate body 1 has a pole mounting hole 11. The shape of the pole mounting hole 11 is adapted to the shape of the pole 2 and is a monolithic structure to ensure that the pole 2 is fixed in position and does not rotate during installation.

[0025] The cover plate body 1 has a flange structure 13 formed around the pole mounting hole 11. The flange structure 13 has an avoidance state and a riveting state. In the avoidance state, the flange structure 13 arches upward in a direction perpendicular to the cover plate body 1, so that the pole 2 can be smoothly inserted into the pole mounting hole 11. In the riveting state, the flange structure 13 undergoes plastic deformation under the action of external force, folds downward and fits tightly against the circumferential surface of the pole 2, so as to achieve a firm riveting fixation of the pole 2.

[0026] The flange structure 13 includes a long side segment 1301 and an arc side segment 1302, which are alternately connected and arranged around the pole post mounting hole 11. The long side segment 1301 corresponds to the straight segment 21 of the pole post 2, and the arc side segment 1302 is adapted to the arc segment 22. In the avoidance state, the arc of the arc side segment 1302 is θ1, where θ1=S / R. When S is smaller or R is larger, θ1 is smaller and the curvature of the arc side segment is gentler. Conversely, when S is larger or R is smaller, θ1 is larger and the arc side segment is closer to a complete semicircle.

[0027] During the riveting process, the riveting equipment applies vertical pressure to the arc-shaped edge segment 1302, causing the flange structure 13 to gradually transition from an avoidance state to a riveting state. At this time, the arc-shaped edge segment 1302 undergoes plastic deformation. If θ1 is too large, the middle area of ​​the arc-shaped edge segment 1302 will be contacted by the riveting equipment first during riveting, while the sides have not yet fully deformed. This makes it difficult for the stress to be evenly distributed at each location, easily leading to localized stress concentration and cracking. Therefore, appropriately controlling the range of θ1 can make the arc-shaped edge segment more evenly stressed during riveting, avoiding stress concentration caused by the preferential contact in the middle area. However, if θ1 is too small, the arc-shaped edge segment 1302 will be closer to a straight line, easily causing the corner positions of the long side segment 1301 and the arc-shaped edge segment 1302 to be closer to right angles, resulting in increased stress concentration at the corner positions. This can easily lead to cracks or fractures during riveting, affecting the reliability of the riveting process.

[0028] Therefore, by limiting the upper limit of θ1, this application can effectively control the initial bending degree of the arc edge segment 1302 in the avoidance state, and avoid the excessive rebound force of the flange structure due to excessive θ1, which will affect the pole assembly; at the same time, by limiting the lower limit of θ1, the transition position between the arc edge segment 1302 and the long side segment 1301 is not too abrupt, which will lead to stress concentration and cracks or plastic deformation failure.

[0029] For example, in this embodiment, the value of θ1 can be 0.9, 1, 1.2, 1.5, 1.8, 2, 2.3, 2.6, or 3.5, or it can be any range formed by any two of the above values.

[0030] In some embodiments, the following condition is satisfied: 8 ≤ S ≤ 160, where the unit is mm.

[0031] This application effectively suppresses excessive local stretching of the arc length S of the inner circumferential surface 1304 of the flange on the side of the arc edge segment 1302 facing the pole mounting hole 11 by controlling the upper limit of the arc length S. This reduces the risk of material breakage and improves the stability of the riveting process. At the same time, by controlling the lower limit of S, it ensures that the arc edge segment 1302 has a sufficient initial arc length to ensure that the flange structure 13 can adapt to the size of the arc segment 22 of the pole post 2, so as to achieve uniform fit and reliable fixation.

[0032] For example, in this embodiment, the value of S can be 8 or 10 or 18 or 25 or 40 or 52 or 77 or 89 or 100 or 110 or 125 or 141 or 150 or 160, or it can be any range formed by any two of the above values.

[0033] In some embodiments, the following condition is satisfied: 4≤R≤50, where the unit is mm.

[0034] This application avoids insufficient contact between the arc edge segment 1302 and the pole post arc segment 22 due to excessively small curvature by limiting the upper limit of the radius R of the inner circumferential surface 1304 of the flange, thus affecting the riveting fit. At the same time, by limiting the lower limit of R, it prevents excessive curvature from causing local stress concentration and ensures the structural strength of the flange structure 13.

[0035] For example, in this embodiment, the value of R can be 4, 6, 8, 10, 18, 25, 40, or 50, or it can be any range formed by any two of the above values.

[0036] In some embodiments, in the avoidance state, the thickness of the flange structure 13 is D, in mm, which satisfies: 0.6≤D≤20.

[0037] This application ensures that the structural stiffness and deformation capacity of the flange structure 13 are coordinated in the avoidance state by reasonably controlling the thickness D of the flange structure 13. This avoids the plastic deformation caused by insufficient structural strength due to insufficient thickness, or the excessive springback force during riveting due to excessive thickness, which would affect the assembly accuracy of the pole post.

[0038] By limiting the upper limit of the thickness D of the flange structure 13, the assembly deviation caused by material springback during the riveting process can be effectively reduced, and the connection reliability can be improved. At the same time, by limiting the lower limit of the D value, it is ensured that the flange structure 13 has sufficient structural strength during the assembly process, and local deformation or tearing due to excessive thickness can be avoided.

[0039] For example, in this embodiment, the value of D can be 0.6, 1, 1.5, 2, 4, 6, 8, 10, 18, or 20, or it can be any range formed by any two of the above values.

[0040] In some embodiments, the following condition is satisfied: 0.03 ≤ D / R ≤ 0.3.

[0041] D / R reflects the relative relationship between the thickness of the arc segment 1302 of the flange structure 13 and the radius of curvature of the arc segment 1302. When R is small, an excessively large D / R may cause stress concentration in the bending part of the material, increasing the risk of cracking. Therefore, D needs to be appropriately reduced to avoid excessive local stress. When R is large, an excessively small D / R may weaken the structural stiffness and affect the bonding stability. Therefore, D needs to be appropriately increased to ensure the structural strength.

[0042] For example, in this embodiment, the value of D / R can be 0.03 or 0.06 or 0.08 or 0.1 or 0.12 or 0.16 or 0.21 or 0.23 or 0.3, or it can be a range formed by any two of the above values.

[0043] In some embodiments, the cover plate body 1 includes a cover plate first surface 101, and a flange structure 13 is formed by extending from the cover plate first surface 101 in a direction away from the cover plate body 1; In a direction parallel to the first surface 101 of the cover plate, and in the avoidance state, the flange structure 13 has long side segments 1301 arranged parallel to each other on both sides, and the distance between the long side segments 1301 on both sides is E, in mm, which satisfies: 8.5≤E≤45.

[0044] This application limits the upper limit of the distance E between the two long side segments 1301 to avoid the arc length S of the corresponding arc side segment 1302 area being too large due to excessive distance, which would cause the arc side segment 1302 to be unable to fully fit the pole post surface due to insufficient deformation during the riveting process; at the same time, by limiting the lower limit of E, the distance is ensured to be moderate, so that the arc side segment 1302 has sufficient deformation space to meet the elastic bending requirements during assembly.

[0045] For example, in this embodiment, the value of E can be 8.5 or 9 or 10 or 14 or 16 or 18 or 20 or 28 or 35 or 40 or 45, or it can be any range formed by any two of the above values.

[0046] In some embodiments, the following condition is satisfied: 0.8 ≤ E / R ≤ 2.5.

[0047] When E is small, an excessively small E / R ratio will result in an overly gentle curvature of the arc-edge segment 1302, affecting its tightness in fitting with the outer circumference of the pole post. Therefore, R needs to be appropriately reduced to enhance the fit. When E is large, an excessively large E / R ratio may result in an overly steep curvature of the arc-edge segment 1302, causing stress concentration in localized areas during riveting and increasing the risk of cracking. Therefore, R needs to be increased to achieve a smooth transition. By controlling E / R within a reasonable range, the geometry of the arc-edge segment 1302 can be optimized, balancing fit and structural reliability.

[0048] For example, in this embodiment, the value of E / R can be 0.8, 1, 1.5, 2, or 2.5, or it can be a range formed by any two of the above values.

[0049] In some embodiments, the long side segment 1301 and the arc side segment 1302 are smoothly connected.

[0050] By making the long side segment 1301 and the arc side segment 1302 smoothly connected, sharp corners or abrupt structures are avoided, and material cracking or fatigue damage caused by stress concentration at the corners is avoided. The smooth transition can also reduce the material flow resistance during riveting, improve the forming stability, and ensure that the arc side segment 1302 is evenly attached to the pole surface during riveting.

[0051] In some embodiments, combined with Figure 4As shown, the long side segment 1301 and the arc side segment 1302 are connected by a transition segment 1305. The transition segment 1305 is arc-shaped, and its two ends are tangentially connected to the long side segment 1301 and the arc side segment 1302, respectively.

[0052] By further incorporating an arc-shaped transition section 1305 between the long side segment 1301 and the arc side segment 1302, and ensuring that its two ends are tangentially connected to the long side segment 1301 and the arc side segment 1302 respectively, the stress distribution at the structural corners can be effectively mitigated, local stress concentration reduced, and the uniformity of material flow during the riveting process improved, thus preventing material cracking caused by a sudden increase in stress. Simultaneously, the tangential connection method ensures a continuous and smooth geometric shape, reducing material flow resistance during the forming process.

[0053] In some embodiments, combined with Figure 5 As shown, the cover plate body 1 includes a cover plate first surface 101, and a flange structure 13 is formed by extending from the cover plate first surface 101 in a direction away from the cover plate body 1; In the direction perpendicular to the first surface 101 of the cover plate, and in the avoidance state, the end face of the flange structure 13 away from the first surface 101 of the cover plate forms a flange top surface 102. The distance between the flange top surface 102 and the first surface 101 of the cover plate is H, in mm, which satisfies: 1.2≤H≤4.0.

[0054] By limiting the upper limit of the distance H between the top surface 102 of the flange and the first surface 101 of the cover plate in the avoidance state, excessive material deformation or cracking due to excessive stroke of the flange structure during riveting can be avoided. Especially when the curvature is large at the arc edge section 1302, an excessively large H will exacerbate the risk of stress concentration and cause local cracking. At the same time, by limiting the lower limit of H, it can be ensured that the flange structure has sufficient extension height to achieve effective fit with the pole post, avoiding loose connection or poor contact due to insufficient height.

[0055] For example, in this embodiment, the value of H can be 1.2 or 1.5 or 2 or 2.5 or 2.8 or 3 or 3.5 or 4.0, or it can be a range formed by any two of the above values.

[0056] In some embodiments, in the riveted state, the flange structure 13 includes an extension 131 and a pressing portion 132. The extension 131 extends from the first surface 101 of the cover plate in a direction away from the cover plate body 1, and the pressing portion 132 bends from one end of the extension 131 away from the first surface 101 of the cover plate toward the pole mounting hole 11. Combination Figure 7As shown, in the direction perpendicular to the first surface 101 of the cover plate and in the riveting state, the end face of the pressing part 132 near the first surface 101 of the cover plate forms a pressing inner surface 1321. The distance between the pressing inner surface 1321 and the first surface 101 of the cover plate is G, in mm, which satisfies: 0.6≤G≤3.2.

[0057] By limiting the upper limit of the distance G between the inner pressing surface 1321 and the first surface 101 of the cover plate in the riveting state, it can be ensured that the pressing part 132 and the pole post are fully fitted after riveting, avoiding loose connection or poor electrical contact due to excessive gap; and by limiting the lower limit of G, it can prevent over-pressing, which could cause excessive local plastic deformation of the material or damage to the pole post structure. In addition, especially for the arc edge section 1302, reasonable control of the G value helps to disperse the stress distribution in the bending area, avoiding wrinkling or cracking of the material due to excessive extrusion, thereby ensuring the stability of the structure after riveting.

[0058] For example, in this embodiment, the value of G can be 0.6 or 0.8 or 1 or 1.2 or 1.5 or 2 or 2.5 or 2.8 or 3 or 3.2, or it can be a range formed by any two of the above values.

[0059] In some embodiments, the following condition is satisfied: 0.4 ≤ G / H ≤ 0.95.

[0060] When H is constant, if G is too large, the distance between the pressing part and the first surface of the cover plate will be too large, resulting in insufficient bending of the flange structure, making it difficult to achieve tight coverage with the pole and affecting the reliability of the connection; if G is too small, the pressing will be excessive, which may easily cause material cracking or pole damage.

[0061] Furthermore, for the arc-shaped segment 1302, when H is constant, if G is too small, the pressing part needs to be bent to a greater extent in the arc-shaped segment. Since the curvature of this area is already large, further increasing the bending amount will significantly increase the local strain, causing the material to be prone to cracking or wrinkling. If G is too large, the bending will be insufficient, causing the pressing part to be unable to effectively fit the side of the pole post, affecting the stability of the electrical connection.

[0062] For example, in this embodiment, the value of G / H can be 0.4, 0.5, 0.55, 0.6, 0.8, or 0.95, or it can be any range formed by any two of the above values.

[0063] In some embodiments, combined with Figure 2 , Figure 3 As shown, the pole post 2 has a stepped portion 23 formed around its outer periphery, and the stepped portion 23 is engaged with the flange structure 13 in a riveted state; The curvature of the outer periphery of the two arc segments 22 of the step 23 is θ2, which satisfies: θ1=θ2.

[0064] By making θ1 equal to θ2, the arc edge segment 1302 of the flange structure 13 and the arc line segment 22 of the step portion 23 of the pole post 2 achieve curvature matching after riveting, effectively avoiding stress concentration caused by geometric inconsistency, further improving the fit of the connection interface, and ensuring mechanical strength.

[0065] 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 2 of the cover plate assembly.

[0066] The battery of this application effectively improves the connection reliability between the terminal post and the flange structure by adopting the above-mentioned cover plate assembly, and suppresses material cracking or connection failure caused by stress concentration. At the same time, by matching the curvature of the step portion 23 with the flange structure 13, the interface fit after riveting is enhanced, the overall structural stability of the battery is improved, and the safety is enhanced, making it suitable for the mass production of high energy density batteries.

[0067] In this application, the tabs of the battery cell are electrically connected to the terminals 2 of the cover plate assembly. Specifically, the tabs can be connected to the terminals 2 via an adapter piece, or the tabs can be directly welded to the terminals. When an adapter piece is used, the tabs and terminals are welded to the adapter piece respectively.

[0068] 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 assembly, characterized by include: The pole (2) is projected in a unicorn shape in the vertical direction. The pole (2) includes two arc segments (22) and a straight segment (21) disposed between the two arc segments (22). The cover plate body (1) has a pole mounting hole (11) that matches the shape of the pole (2). The cover plate body (1) has a flange structure (13) around the pole mounting hole (11). The flange structure (13) has a clearance state that avoids the pole (2) from being inserted into the pole mounting hole (11), and a riveting state that rivets the pole (2) to be fixed. The flange structure (13) can switch from the clearance state to the riveting state under the action of external force. The flange structure (13) includes a long side segment (1301) corresponding to the straight segment (21) and an arc side segment (1302) corresponding to the arc segment (22). The long side segment (1301) and the arc side segment (1302) are alternately connected and arranged around the pole mounting hole (11). In the avoidance state, the arc of the arc segment (1302) is θ1, and θ1=S / R, where S is the arc length of the inner circumferential surface (1304) of the flange on the side of the arc segment (1302) facing the pole mounting hole (11), in mm; and R is the radius of the inner circumferential surface (1304) of the flange, in mm. It satisfies: 0.9≤θ1≤3.

5.

2. The cover plate assembly according to claim 1, characterized in that, It satisfies: 8≤S≤160, in mm.

3. The cover plate assembly of claim 1, wherein, It satisfies: 4≤R≤50, in mm.

4. The cover plate assembly of claim 1, wherein, In the avoidance state, the thickness of the flange structure (13) is D, in mm, and satisfies: 0.6≤D≤20.

5. The cover plate assembly of claim 4, wherein, It satisfies: 0.03≤D / R≤0.

3.

6. The cover plate assembly of claim 1, wherein, The cover plate body (1) includes a cover plate first surface (101), and the flange structure (13) is formed by extending from the cover plate first surface (101) in a direction away from the cover plate body (1); In a direction parallel to the first surface (101) of the cover plate, and in the avoidance state, the flange structure (13) has long side segments (1301) arranged parallel to each other on both sides, and the distance between the long side segments (1301) on both sides is E, in mm, which satisfies: 8.5≤E≤45.

7. The cover plate assembly of claim 6, wherein, It satisfies: 0.8≤E / R≤2.

5.

8. The cover plate assembly of claim 1, wherein, The long side segment (1301) and the arc side segment (1302) are connected by a transition segment (1305). The transition segment (1305) is arc-shaped, and its two ends are tangentially connected to the long side segment (1301) and the arc side segment (1302), respectively.

9. The cover plate assembly of claim 1, wherein, The cover plate body (1) includes a cover plate first surface (101), and the flange structure (13) is formed by extending from the cover plate first surface (101) in a direction away from the cover plate body (1); In the direction perpendicular to the first surface (101) of the cover plate, and in the avoidance state, the end face of the flange structure (13) away from the first surface (101) of the cover plate forms a flange top surface (102), and the distance between the flange top surface (102) and the first surface (101) of the cover plate is H, in mm, which satisfies: 1.2≤H≤4.

0.

10. The cover plate assembly of claim 9, wherein, In the riveted state, the flange structure (13) includes an extension (131) and a pressing part (132). The extension (131) extends from the first surface (101) of the cover plate in a direction away from the cover plate body (1), and the pressing part (132) bends from one end of the extension (131) away from the first surface (101) of the cover plate toward the pole mounting hole (11). In the direction perpendicular to the first surface (101) of the cover plate, and in the riveting state, the pressing part (132) forms a pressing inner surface (1321) on the end face of the first surface (101) of the cover plate. The distance between the pressing inner surface (1321) and the first surface (101) of the cover plate is G, in mm, which satisfies: 0.6≤G≤3.

2.

11. The cover plate assembly of claim 10, wherein, It satisfies: 0.4≤G / H≤0.

95.

12. The cover plate assembly of claim 1, wherein, The pole post (2) has a stepped portion (23) formed around its outer periphery, and the stepped portion (23) and the flange structure (13) are engaged in the riveted state; The curvature of the outer periphery of the two arc segments (22) of the stepped part (23) is θ2, which satisfies: θ1=θ2.

13. A battery, characterized by include: shell; And a cover plate assembly as described in any one of claims 1 to 12, 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 (2) of the cover plate assembly.

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