Cover plate assembly and battery

Abstract

This application relates to the field of battery technology and discloses a cover plate assembly and a battery. The cover plate assembly includes: a cover plate body with terminal mounting holes and a flange structure; a terminal, whose projection on the extending plane of the cover plate body is a unicornuate shape; the flange structure includes an extension portion and a pressing portion; the pressing portion includes a long side section suitable for pressing a straight portion and an arc side section suitable for pressing an arc portion; the width of the pressing portion extending from the extension portion on the long side section is S (in mm); the width of the pressing portion extending from the extension portion on the arc side section is T (in mm), and S > T. The cover plate assembly provided by this application enables the long side section to apply a greater pressing force to the straight portion of the unicornuate terminal after riveting, thereby improving the pressing tightness and connection reliability of the terminal edge, avoiding local deformation of the long side section due to its long length, and improving the deformation resistance of the long side section.

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 mounting holes for terminals. To secure the terminals to the cover, a flange extends from the cover, surrounding the mounting holes, and the terminals are pressed into the holes using a riveting method. Most existing terminals are circular, which is cheaper to manufacture and rivet, and the flange provides even pressure on the terminals after riveting, ensuring balanced stress across all positions. However, due to the limited width of the battery cover, the width of the circular terminals is limited by the width of the cover, resulting in a smaller area available for electrical connections. With the increasing demand for high-rate charging and discharging and higher current-carrying capacity in batteries, circular terminals are increasingly unable to meet these requirements.

[0003] To address the issue of insufficient current-carrying area in the electrode post, elongating it into a unicorn shape significantly increases the weldable area on the post's end face, thereby substantially improving current-carrying capacity. Simultaneously, the increased surface area also allows for better heat dissipation. However, research has found that after riveting the flange structure, due to the unicorn shape of the electrode post, it is difficult for the flange structure to achieve uniform pressing of its edges during the riveting process, affecting the reliability of the connection between the electrode post and the cover plate. Summary of the Invention

[0004] In view of this, this application provides a cover plate assembly and a battery to solve the problem that when the terminal post is unicornuate, the flange structure is difficult to uniformly press its edges during the riveting process.

[0005] In a first aspect, this application provides a cover plate assembly, comprising: The cover plate body has a pole mounting hole, and the cover plate body extends toward the surface away from the cover plate body to form a flange structure, which surrounds the pole mounting hole. The pole is fixed in the pole mounting hole. The projection of the pole on the extension plane of the cover plate body is a monolithic circle. The monolithic circle includes two arc-shaped parts arranged opposite each other and two straight parts connecting the two arc-shaped parts. The flange structure includes an extension and a pressing part. The extension extends from the cover plate body in a direction away from the cover plate body. The pressing part is located at the end of the extension away from the cover plate body and extends toward the pole post. The projection of the extension on the extension plane of the cover plate body coincides with part of the outer peripheral surface of the pole post. The pressing part includes a long side section suitable for pressing a straight part and an arc side section suitable for pressing an arc part; the width of the pressing part located on the long side section extending from the extension part is S, in mm; the width of the pressing part located on the arc side section extending from the extension part is T, in mm, and S > T.

[0006] Beneficial effects: By setting the width S of the pressing part of the long side segment to be greater than the width T of the pressing part of the arc side segment, the long side segment can apply a greater pressing force to the straight part of the unicornuate terminal after riveting, thereby improving the pressing tightness and connection reliability of the terminal edge, avoiding local deformation due to the long side segment's length, improving the deformation resistance of the long side segment, and ensuring that each area of ​​the pressing part has a good pressing effect, avoiding poor contact or structural loosening caused by uneven pressing, and thus improving the overall electrical connection stability of the battery.

[0007] Secondly, this application also provides a battery, including: a casing; And a cover plate assembly as described above is disposed on the housing, the housing 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 an exploded view of the cover plate assembly of this application; Figure 2 This is a top view of the pole of this application; Figure 3 This is a top view of the cover plate assembly of this application after removing the pole posts; Figure 4 for Figure 2 Local magnification Figure 1 ; Figure 5 for Figure 2 Local magnification Figure 2 ; Figure 6 for Figure 3 A schematic diagram of section AA; Figure 7 for Figure 3 A schematic diagram of the BB section; Figure 8 This is a partially enlarged view of the cover plate body according to another embodiment.

[0011] Explanation of reference numerals in the attached figures: 1. Cover plate body; 11. Pole post mounting hole; 12. Cantilever section; 13. Flange structure; 131. Arc edge section; 132. Long side section; 133. Transition section; 1321. First sub-side section; 1322. Second sub-side section; 1301, Extension section; 1302, Pressing section; 2. Pole column; 21. Stepped section; 22. Straight section; 23. Curved 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 mounting holes for terminals. To secure the terminals to the cover, a flange extends from the cover, surrounding the mounting holes, and the terminals are pressed into the holes using a riveting method. Most existing terminals are circular, which is cheaper to manufacture and rivet, and the flange provides even pressure on the terminals after riveting, ensuring balanced stress across all positions. However, due to the limited width of the battery cover, the width of the circular terminals is limited by the width of the cover, resulting in a smaller area available for electrical connections. With the increasing demand for high-rate charging and discharging and higher current-carrying capacity in batteries, circular terminals are increasingly unable to meet these requirements.

[0017] To address the issue of insufficient current-carrying area in the electrode terminals, elongating them into a unicornuate shape significantly increases the solderable area on the terminal end face, thereby substantially improving current-carrying capacity. Simultaneously, the increased surface area also allows for better heat dissipation.

[0018] However, research has found that when the pole post is circular, the flange structure can uniformly press the pole post after riveting, resulting in balanced force at each location. But when the pole post is unicornuate, due to the shape characteristics of the unicornuate pole post, the flange structure struggles to achieve uniform pressing of its edges during the riveting process. Since the unicornuate pole post has an alternating structure of curved and straight segments, with the straight segments being relatively long, if the pressing dimensions of the flange structure are the same for both curved and straight segments, insufficient pressing force at the straight segments can easily occur, leading to a greater risk of vibration failure. This, in turn, affects the fixation effect of the pole post and the reliability of the connection between the pole post and the cover plate.

[0019] The following is combined Figures 1 to 8 This describes an embodiment of the present application.

[0020] According to embodiments of this application, in one aspect, a cover plate assembly is provided, comprising: The cover plate body 1 has an electrode mounting hole 11. The cover plate body 1 extends toward the surface away from the cover plate body 1 to form a flange structure 13. The flange structure 13 is arranged around the electrode mounting hole 11. The pole post 2 is fixed in the pole post mounting hole 11. The projection of the pole post 2 on the extended plane of the cover plate body 1 is a unicornuate. The unicornuate includes two arcuate portions 23 arranged opposite to each other and a straight portion 22 connecting the two arcuate portions 23. The flange structure 13 includes an extension 1301 and a pressing part 1302. The extension 1301 extends from the cover plate body 1 in a direction away from the cover plate body 1. The pressing part 1302 is disposed at the end of the extension 1301 away from the cover plate body 1 and extends toward the pole post 2. The projection of the extension 1301 on the extension plane of the cover plate body 1 coincides with part of the outer peripheral surface of the pole post 2. The pressing portion 1302 includes a long side segment 132 suitable for pressing the straight portion 22 and an arc side segment 131 suitable for pressing the arc portion 23; the width of the pressing portion 1302 located on the long side segment 132 extending from the extension portion 1301 is S, in mm; the width of the pressing portion 1302 located on the arc side segment 131 extending from the extension portion 1301 is T, in mm, and satisfies S > T.

[0021] It should be noted that a monolith 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 either side, and is commonly referred to as a monolith in industrial applications. Additionally, a monolith can also be called a running track shape.

[0022] 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.

[0023] The cover plate body 1 extends toward the surface away from the cover plate body 1 to form a flange structure 13. The flange structure 13 has a clearance state and a pressing state. When the flange structure 13 is in the clearance state, the pole post 2 can be smoothly inserted into the pole post mounting hole 11. By applying pressure to the flange structure 13 through a riveting device, it changes from the clearance state to the pressing state, thereby firmly fixing the pole post 2 in the pole post mounting hole 11.

[0024] When the flange structure 13 is in the pressed state, the flange structure 13 includes an extension 1301 and a pressing part 1302, wherein the long side segment 132 and the arc side segment 131 of the pressing part 1302 correspond to the straight part 22 and the arc part 23 of the pole post 2, respectively.

[0025] In the pressed state, the pressing part 1302 can press the pole post 2. However, since the pole post 2 is unicornuate in structure, the length of its straight part 22 is greater than the arc length of the arc part 23, resulting in a greater pressing force required at the straight part 22. By setting the width S of the long side segment 132 extending from the extension part 1301 to be greater than the width T of the arc side segment 131 extending from the extension part 1301, the long side segment 132 provides a larger pressing width at the straight part 22, avoiding local deformation of the long side segment 132 due to its long length, improving the deformation resistance of the long side segment, thereby ensuring that each area of ​​the pressing part 1302 has a good pressing effect, thereby increasing the contact area and pressing force, effectively compensating for the uneven force caused by structural differences, improving the fixation stability of the pole post 2 in the vibration environment, and avoiding vibration failure caused by insufficient pressing force.

[0026] Additionally, an insulating component is provided between the pole post 2 and the cover plate body 1 to ensure the insulation effect between the two and avoid short circuit due to contact.

[0027] In some embodiments, 0.8 ≤ S ≤ 1.8, where the unit is mm.

[0028] This application ensures that the long side segment 132 has sufficient material width to withstand the stress generated during the pressing process by limiting the lower limit of the width S of the pressing portion 1302 extending from the extension portion 1301, thus avoiding structural weakness due to insufficient width. At the same time, limiting the upper limit of S prevents excessive extension from causing material waste or interference with adjacent structures, and also prevents the pressing portion 1302 from occupying too much space of the pole post 2, thus avoiding the compression of the electrical connection area of ​​the pole post 2 due to excessive extension of the pressing portion 1302, which would affect the conductivity.

[0029] For example, in this embodiment, the value of S can be 0.8 or 0.9 or 1.0 or 1.1 or 1.3 or 1.5 or 1.7 or 1.8, or it can be a range formed by any two of the above values.

[0030] In some embodiments, 1.0 ≤ T ≤ 2.0, where the unit is mm.

[0031] This application ensures that the arc-edge segment 131 has sufficient structural strength during the pressing process by limiting the lower limit of the width T of the pressing portion 1302 extending from the extension portion 1301 located on the arc-edge segment 131, so as to adapt to the curved surface contour of the arc portion 23 of the pole post 2 and achieve uniform fit; at the same time, it limits the upper limit of T to avoid material redundancy and interference with surrounding components, and also to avoid encroaching on the assembly space of the pole post 2 due to excessive extension of the arc-edge segment 131, and to avoid squeezing the electrical connection area of ​​the pole post 2, so as to ensure that its conductivity is not affected.

[0032] Furthermore, by reasonably controlling the size range of T, the arc edge segment 131 can not only closely fit the curved surface structure of the arc part 23, but also avoid assembly difficulties or stress concentration due to excessive extension, thereby further improving the reliability of pressing.

[0033] For example, in this embodiment, the value of T can be 1.0, 1.1, 1.3, 1.5, 1.7, 1.8, 1.9, or 2.0, or it can be a range formed by any two of the above values.

[0034] In some embodiments, 0.3 ≤ S / T ≤ 0.9 is satisfied.

[0035] By limiting the range of the ratio of S to T, the pressing width of the long side segment 132 and the arc side segment 131 is kept in a reasonable proportion, ensuring that the straight part 22 and the arc part 23 are subjected to balanced force during the pressing process.

[0036] Specifically, by limiting the lower limit of the S / T ratio, it is ensured that the pressing width of the long side segment 132 is not less than the pressing width of the arc side segment 131, thus avoiding loosening of the connection due to insufficient pressing force of the straight part 22; and by limiting the upper limit of the S / T ratio, it is prevented that the long side segment 132 extends excessively and affects the surrounding structural layout of the pole post 2. At the same time, material utilization and assembly feasibility are taken into account, so that the pressing part 1302 can achieve stable fitting in different geometric areas, further optimizing the overall stress distribution and improving the connection reliability and structural durability of the pole post 2 under complex working conditions.

[0037] For example, in this embodiment, the value of S / T can be 0.3, 0.4, 0.5, 0.8, or 0.9, or it can be a range formed by any two of the above values.

[0038] In some embodiments, combined with Figure 4 As shown, the long side segment 132 and the arc side segment 131 are smoothly connected via a transition segment 133.

[0039] The transition section 133 effectively alleviates stress concentration at the connection between the long side section 132 and the arc side section 131, improves the continuity of the overall structure of the pressing part 1302, and makes it easier to conform to the contour changes of the pole post 2 during the pressing process, ensuring uniform force transmission along the circumference. At the same time, the smooth connection of the transition section 133 avoids the risk of local deformation caused by right-angle turns, further improving assembly accuracy and structural reliability.

[0040] In some embodiments, the radius of curvature of the transition segment 133 is R, in mm, and satisfies 0.2≤R≤10.

[0041] By reasonably controlling the range of R, the transition section 133 can achieve a smooth connection between the long side section 132 and the arc side section 131 in terms of curvature, making the matching of the flange structure 13 and the pole post 2 smoother, reducing deformation resistance during assembly, and improving the consistency of pressing.

[0042] To avoid stress concentration or forming difficulties caused by an excessively small radius of curvature. At the same time, to avoid local bulging of the pressing part 1302 due to an excessively large radius of curvature, which would affect the overall compactness of the covering.

[0043] For example, in this embodiment, the value of R can be 0.2 or 0.3 or 0.4 or 0.5 or 1 or 1.5 or 2 or 3.5 or 5.2 or 6.7 or 8.3 or 10, or it can be a range formed by any two of the above values.

[0044] In some embodiments, the length direction of the cover plate body 1 is defined as the first direction, the width direction is defined as the second direction, and the straight portion 22 of the pole post 2 is arranged parallel to the first direction; Combination Figure 4As shown, the long side segment 132 includes a first sub-side segment 1321 and a second sub-side segment 1322. The first sub-side segment 1321 is disposed on both sides of the second sub-side segment 1322 along a first direction. One end of the first sub-side segment 1321 is connected to the second sub-side segment 1322, and the other end is connected to the arc side segment 131, specifically connected to the transition segment 133.

[0045] By further defining the segmented structure of the long side segment 132, the stress distribution of the pressing part 1302 in the first direction is made more uniform, effectively reducing local stress peaks. At the same time, this layout is conducive to the uniform flow of material during mold forming, reducing processing defects caused by structural abrupt changes, and further ensuring product consistency.

[0046] The length of the first sub-side segment 1321 extending in the second direction can effectively cover both sides of the pole post 2, thereby increasing the coverage contact area between the long side segment 132 and the pole post 2, and providing a larger pressing width for the long side segment 132 at the straight part 22.

[0047] Meanwhile, forming the long side segment 132 into a segmented structure can reduce the length of the second sub-side segment 1322, thereby reducing the risk of warping due to excessive length during the pressing process and improving structural stability.

[0048] In some embodiments, the second sub-side segment 1322 is constructed as a straight line segment, and the extension direction of the second sub-side segment 1322 is parallel to the first direction.

[0049] The second sub-segment 1322 is constructed as a straight segment, and its extension direction is parallel to the first direction. This ensures that the second sub-segment 1322 and the straight portion 22 of the pole post 2 are highly aligned in the first direction, facilitating parallel fit with the straight portion 22 of the pole post 2. This ensures uniform force transmission during pressing and reduces localized compression damage caused by misalignment or tilting. Simultaneously, it helps improve assembly accuracy, reduces alignment difficulty, increases production efficiency, and reduces process deviations.

[0050] In some embodiments, an included angle W is formed between the first sub-side segment 1321 and the second sub-side segment 1322, in degrees, and satisfies 90 < W ≤ 175.

[0051] By limiting the upper limit of the included angle W between the first sub-segment 1321 and the second sub-segment 1322, the length of the first sub-segment 1321 extending along the second direction is prevented from being too short, thus affecting the covering effect on the pole post 2; and by limiting the lower limit of the included angle W, stress concentration in the transition area between the first sub-segment 1321 and the second sub-segment 1322 is prevented from being too small.

[0052] Reasonably controlling the range of the included angle W helps to adjust the deformation path of the long side segment 132 during the pressing process while ensuring the coating performance, avoiding material accumulation or stress concentration due to the angle being too small, and improving the uniformity of material flow.

[0053] In this embodiment, the connection angle between the first sub-segment 1321 and the second sub-segment 1322 is preferably an obtuse angle to mitigate abrupt changes in the stress transmission path and enhance the fatigue resistance of the structure.

[0054] For example, in this embodiment, the value of W can be 90, 100, 120, 130, 145, 152, or 175, or it can be any range formed by any two of the above values.

[0055] In some embodiments, combined with Figure 8 As shown, the second sub-side segment 1322 is constructed as an arc segment, and the central region of the second sub-side segment 1322 protrudes along the second direction toward the central axis of the cover plate body 1.

[0056] By constructing the second sub-segment 1322 as an arc segment and making its central region protrude along the second direction, the contact area between the central region of the second sub-segment 1322 and the pole post 2 can be further increased, avoiding local loosening or detachment of the pole post 2 due to the small constraint force in the central region of the second sub-segment 1322, thereby improving the stability of the connection.

[0057] In some embodiments, along the second direction, two long side segments 132 are symmetrically arranged on both sides of the cover plate body 1.

[0058] The symmetrically arranged long side segments 132 can evenly transmit the force during the pressing process, reducing the risk of twisting or warping of the cover plate body 1 due to uneven load. At the same time, the symmetrical structure is conducive to uniform material flow during mold forming, reducing the molding difficulty and improving product consistency.

[0059] In some embodiments, combined with Figure 5 As shown, along the second direction, the minimum distance between the two long side segments 132 is K, in mm, and satisfies 8≤K≤30.

[0060] If the K value is too large, it may lead to insufficient covering force and affect the reliability of the connection; if the K value is too small, it may cause material interference, resulting in difficulty in pressing or material cracking, and may occupy too much of the electrical connection area of ​​the pole 2, affecting the overcurrent performance.

[0061] By controlling the minimum spacing K between the two long side segments 132 within a reasonable range, it is possible to ensure effective coverage of the pole post 2 while avoiding structural interference and excessive occupation of electrical connection space.

[0062] For example, in this embodiment, the value of K can be 8, 9, 10, 13, 15, 20, 23, or 30, or it can be any range formed by any two of the above values.

[0063] In some embodiments, the maximum spacing of the pressing portion 1302 along the second direction is Y, in mm, and satisfies 8.05≤Y≤32.

[0064] By limiting the upper limit of the maximum spacing Y of the pressing part 1302 along the second direction, it is possible to effectively avoid the pressing parts 1302 on both sides from being unable to fully cover the pole post 2 due to excessive spacing, resulting in insufficient connection strength; at the same time, it is possible to avoid material accumulation or compression cracking due to excessive spacing.

[0065] For example, in this embodiment, the value of Y can be 8.05, 9, 10, 13, 15, 20, 23, 30, or 32, or it can be any range formed by any two of the above values.

[0066] In some embodiments, the maximum spacing of the pressing portions 1302 along the first direction is X, in mm, and satisfies 15≤X≤80.

[0067] By controlling the upper limit of the maximum spacing X of the pressing part 1302 along the first direction, it is possible to effectively prevent the contact area between the pressing part 1302 and the pole post 2 in the first direction from decreasing due to excessive X value, thereby affecting the stability of the electrical connection; at the same time, it is to avoid excessive material compression caused by excessive X value, which may lead to deformation or cracking.

[0068] For example, in this embodiment, the value of X can be 15, 20, 30, 42, 50, 55, 64, 73, or 80, or it can be any range formed by any two of the above values.

[0069] In some embodiments, the maximum spacing of the pressing portions 1302 along the second direction is Y, in mm; the maximum spacing of the pressing portions 1302 along the first direction is X, in mm; and satisfies 0.1≤Y / X≤0.65.

[0070] By controlling the Y / X ratio within a reasonable range, the dimensional matching relationship of the pressing part 1302 in two directions can be coordinated to ensure uniform stress during the wrapping process and improve connection reliability.

[0071] If the Y / X ratio is too small, the spacing between the pressing parts 1302 on both sides in the second direction will be relatively narrow. Although this will enhance the local coverage, it will restrict the electrical connection area reserved in the second direction of the pole post 2, affecting the current carrying capacity. If the Y / X ratio is too large, the coverage in the second direction will be insufficient, which may easily lead to loosening of the connection.

[0072] For example, in this embodiment, the value of Y / X can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or 0.65, or it can be any range formed by any two of the above values.

[0073] In some embodiments, along the second direction, the minimum distance between the long side segments 132 on both sides is K, in mm; the maximum distance between the pressing parts 1302 along the second direction is Y, in mm; and satisfies 0.9≤K / Y≤0.995.

[0074] By reasonably controlling the upper limit of the K / Y ratio, it is possible to avoid the electrical connection area reserved in the second direction of the pole post 2 being limited due to the small spacing between the long side segments 132 on both sides, which would reduce the wall current carrying capacity; at the same time, it is to prevent the long side segments 132 from not covering the pole post 2 sufficiently due to the large K / Y ratio, which would affect the mechanical strength of the connection structure.

[0075] For example, in this embodiment, the value of K / Y can be 0.9, 0.92, 0.95, 0.98, 0.99, or 0.995, or it can be any range formed by any two of the above values.

[0076] In some embodiments, the flange structure 13 is integrally formed with the cover plate body 1, and the upper end surface of the flange structure 13 is higher than the upper surface of the cover plate body 1.

[0077] In this embodiment, the flange structure 13 and the cover plate body 1 are integrally formed, specifically by stamping. This integral forming process not only improves the connection strength between the flange structure 13 and the cover plate body 1, but also reduces assembly steps and increases production efficiency.

[0078] In some embodiments, the through direction of the pole mounting hole 11 is defined as the third direction, and the third direction is perpendicular to both the first and second directions. The overlapping area of ​​the projection of the long side segment 132 along the third direction and the pole column 2 is the first overlapping area. The width of the first overlapping area along the second direction is P, in mm, and satisfies 0.15≤P≤1.2.

[0079] By controlling P within a reasonable range, it can be ensured that the long side segment 132 has sufficient projection width over the pole post 2 in the third direction, thereby improving the stability of the connection area. If the value of P is too small, the overlap between the long side segment 132 and the pole post 2 in the third direction will be insufficient, resulting in a decrease in coverage strength and easy loosening under vibration. If the value of P is too large, it may interfere with the assembly space of the pole post 2 and other components, increasing the difficulty of installation.

[0080] For example, in this embodiment, the value of P can be 0.15, 0.21, 0.32, 0.45, 0.8, 0.9, 1.0, 1.1, or 1.2, or it can be any range formed by any two of the above values.

[0081] In some embodiments, the following condition is satisfied: 0.15 ≤ P / S ≤ 0.7.

[0082] Furthermore, by limiting the range of the P / S ratio, the coverage effect of the first overlapping area and the space utilization rate of the structure around the pole mounting hole can be coordinated. If the P / S is too small, the third-dimensional coverage will be insufficient, affecting the connection reliability. If the P / S is too large, it may cause the pole 2 to interfere with the cover plate body 1 during assembly, reducing the assembly yield.

[0083] For example, in this embodiment, the value of P / S can be 0.15, 0.21, 0.32, 0.45, or 0.7, or it can be any range formed by any two of the above values.

[0084] In some embodiments, the through direction of the pole mounting hole 11 is defined as the third direction, and the third direction is perpendicular to both the first and second directions. The overlapping area of ​​the projection of the arc segment 131 along the third direction and the pole column 2 is the second overlapping area. The width of the second overlapping area along the first direction is Q, in mm, and satisfies 0.2≤Q≤1.5.

[0085] By limiting the lower limit of the width Q of the second overlapping region along the first direction, it can be ensured that the arc edge segment 131 effectively covers the pole post 2 in the third direction, thereby improving the vibration resistance of the connection structure; and by limiting the upper limit of the value of Q, the arc edge segment 131 is prevented from extending excessively and causing spatial interference with adjacent devices.

[0086] For example, in this embodiment, the value of Q can be 0.2 or 0.21 or 0.32 or 0.45 or 0.7 or 0.8 or 0.9 or 1.0 or 1.1 or 1.2 or 1.5, or it can be a range formed by any two of the above values.

[0087] In some embodiments, the following condition is satisfied: 0.2 ≤ Q / T ≤ 0.75.

[0088] By further limiting the range of the Q / T ratio, the covering effect of the arc edge segment 131 in the third direction and the space occupation of the structure around the pole mounting hole can be balanced. If Q / T is too small, the arc edge segment 131 will not cover the pole 2 enough, weakening the connection strength. If Q / T is too large, it will be easy to cause assembly conflicts with adjacent components, affecting the overall layout compactness.

[0089] For example, in this embodiment, the value of Q / T can be 0.2 or 0.21 or 0.32 or 0.45 or 0.7 or 0.75, or it can be a range formed by any two of the above values.

[0090] According to an embodiment of this application, another aspect provides a battery, comprising: case; And a cover plate assembly as described above is disposed on the housing, the housing 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.

[0091] The battery of this application effectively improves the reliability of the terminal connection by adopting the above-mentioned cover plate assembly, and maintains stable electrical connection performance under vibration or shock conditions; at the same time, it optimizes the utilization of assembly space and structural compactness, avoids excessive compression of the conductive area of ​​the terminal 2, and ensures that the overcurrent capacity is not affected.

[0092] 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 in that, include: The cover plate body (1) has an electrode mounting hole (11) thereon. The cover plate body (1) extends toward the surface away from the cover plate body (1) to form a flange structure (13). The flange structure (13) is arranged around the electrode mounting hole (11). The pole post (2) is fixed in the pole post mounting hole (11). The projection of the pole post (2) on the extended plane of the cover plate body (1) is a unicornuate. The unicornuate includes two arcuate portions (23) arranged opposite to each other and two straight portions (22) connected between the two arcuate portions (23). The flange structure (13) includes an extension (1301) and a pressing part (1302). The extension (1301) extends from the cover plate body (1) in a direction away from the cover plate body (1). The pressing part (1302) is disposed at one end of the extension (1301) away from the cover plate body (1) and extends toward the pole post (2). The projection of the extension (1301) on the extension plane of the cover plate body (1) coincides with part of the outer peripheral surface of the pole post (2). The pressing part (1302) includes a long side segment (132) suitable for pressing the straight part (22) and an arc side segment (131) suitable for pressing the arc part (23); the width of the pressing part (1302) located on the long side segment (132) extending from the extension part (1301) is S, in mm; the width of the pressing part (1302) located on the arc side segment (131) extending from the extension part (1301) is T, in mm, and satisfies S > T.

2. The cover plate assembly according to claim 1, characterized in that, The condition is satisfied that 0.8 ≤ S ≤ 1.8 (in mm) and / or that 1.0 ≤ T ≤ 2.0 (in mm).

3. The cover plate assembly according to claim 1, characterized in that, It satisfies 0.3≤S / T≤0.

9.

4. The cover plate assembly according to claim 1, characterized in that, The long side segment (132) and the arc side segment (131) are smoothly connected via a transition segment (133), the radius of curvature of the transition segment (133) is R, in mm, and satisfies 0.2≤R≤10.

5. The cover plate assembly according to claim 1, characterized in that, The length direction of the cover plate body (1) is defined as the first direction, the width direction as the second direction, and the straight part (22) of the pole post (2) is arranged parallel to the first direction; The long side segment (132) includes a first sub-side segment (1321) and a second sub-side segment (1322). The first sub-side segment (1321) is disposed on both sides of the second sub-side segment (1322) along the first direction. One end of the first sub-side segment (1321) is connected to the second sub-side segment (1322), and the other end is connected to the arc side segment (131).

6. The cover plate assembly according to claim 5, characterized in that, The second sub-side segment (1322) is a straight line segment, and the extension direction of the second sub-side segment (1322) is parallel to the first direction.

7. The cover plate assembly according to claim 6, characterized in that, An included angle W is formed between the first sub-side segment (1321) and the second sub-side segment (1322), in degrees, and satisfies 90 < W ≤ 175.

8. The cover plate assembly according to claim 5, characterized in that, The second sub-side segment (1322) is constructed as an arc segment, and the central region of the second sub-side segment (1322) protrudes along the second direction toward the central axis of the cover plate body (1).

9. The cover plate assembly according to claim 5, characterized in that, Along the second direction, the two long side segments (132) are symmetrically arranged on both sides of the cover plate body (1).

10. The cover plate assembly according to claim 9, characterized in that, Along the second direction, the minimum distance between the long side segments (132) on both sides is K, in mm, and satisfies 8≤K≤30.

11. The cover plate assembly according to claim 9, characterized in that, The maximum spacing of the pressing part (1302) along the second direction is Y, in mm, and satisfies 8.05≤Y≤32.

12. The cover plate assembly according to claim 9, characterized in that, The maximum spacing of the pressing part (1302) along the first direction is X, in mm, and satisfies 15≤X≤80.

13. The cover plate assembly according to claim 9, characterized in that, The maximum spacing of the pressing part (1302) along the second direction is Y, in mm; the maximum spacing of the pressing part (1302) along the first direction is X, in mm; and satisfies 0.1≤Y / X≤0.

65.

14. The cover plate assembly according to claim 9, characterized in that, Along the second direction, the minimum distance between the long side segments (132) on both sides is K, in mm; the maximum distance between the pressing part (1302) along the second direction is Y, in mm; and satisfies 0.9≤K / Y≤0.

995.

15. The cover plate assembly according to claim 1, characterized in that, The flange structure (13) is integrally formed with the cover plate body (1), and the upper end surface of the flange structure (13) is higher than the upper surface of the cover plate body (1).

16. The cover plate assembly according to claim 5, characterized in that, The penetration direction of the pole mounting hole (11) is defined as the third direction, and the third direction is perpendicular to both the first direction and the second direction. The overlapping area between the projection of the long side segment (132) along the third direction and the pole column (2) is the first overlapping area. The width of the first overlapping area along the second direction is P, in mm, and satisfies 0.15≤P≤1.

2.

17. The cover plate assembly according to claim 16, characterized in that, It satisfies: 0.15≤P / S≤0.

7.

18. The cover plate assembly according to claim 5, characterized in that, The penetration direction of the pole mounting hole (11) is defined as the third direction, and the third direction is perpendicular to both the first direction and the second direction. The overlapping area between the projection of the arc segment (131) along the third direction and the pole column (2) is the second overlapping area. The width of the second overlapping area along the first direction is Q, in mm, and satisfies 0.2≤Q≤1.

5.

19. The cover plate assembly according to claim 18, characterized in that, It satisfies: 0.2≤Q / T≤0.

75.

20. A battery, characterized in that, include: case; 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 (2) of the cover plate assembly.

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