Battery cell cover plate and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the pole is assembled in the mounting hole; an extension part protruding outwards is formed on one side, facing the exterior of the battery cell, of the mounting hole, one end, far away from the cover plate main body, of the extension part is bent towards the direction close to the pole to form a flanging part, a convex part extending towards the direction close to the pole is formed on the hole wall of the mounting hole, and the convex part and the flanging part are arranged at an interval in the thickness direction of the cover plate main body; a groove is defined; a limiting boss extending outwards is formed on the circumferential side wall of the pole and extends into the groove; the first insulating part is clamped between the mounting hole and the pole; and the sealing piece is clamped between the limiting boss and the convex part. According to the battery cell cover plate, the pole columns are directly assembled on the cover plate main body, so that the assembling procedures of the battery cell cover plate are saved, the production process of the battery cell cover plate is simplified, the production efficiency of the battery cell cover plate is improved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a kind of battery cell cover plate and battery cell. BACKGROUND

[0002] With the increasingly mature lithium ion battery technology, lithium ion battery is widely used as power battery in electric vehicle and energy storage field, and the use performance and safety of lithium ion battery are increasingly high.

[0003] Lithium battery cover plate is the key accessory in lithium ion battery, its function is to form sealed cavity with shell welding, lead out positive and negative pole group, as assembly carrier etc. Traditional cover plate includes riveting block, upper plastic, pole, top cover piece, lower plastic, sealing ring and explosion-proof valve structure, pole and riveting block are riveted first and then welded, so that pole is fixed on top cover piece, traditional cover plate has many parts, and there are defects of complex assembly and cumbersome process, resulting in high production cost and low production efficiency of cover plate. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a battery cell cover plate and a battery cell to solve the problem of complex assembly and cumbersome process of the existing cover plate due to the presence of riveting block, resulting in high production cost and low production efficiency.

[0005] The utility model provides a kind of battery cell cover plate in the first aspect of the utility model, wherein the battery cell cover plate includes:

[0006] Cover plate main body, installation hole is set up;

[0007] Pole, assembly in the installation hole;The side of the installation hole towards the outside of battery cell is formed with outwardly protruding extension, the end of the extension away from the cover plate main body is bent towards the direction close to the pole to form flanging portion, the hole wall of the installation hole is formed with the convex portion extending towards the direction close to the pole, the convex portion and the flanging portion are spaced apart in the thickness direction of the cover plate main body to form recess;The circumferential sidewall of the pole is formed with outwardly extending limiting boss, and the limiting boss extends into the recess;

[0008] First insulating piece, clamped between the installation hole and the pole;

[0009] Sealing element, clamped between the limiting boss and the convex portion;

[0010] The thickness dimension of the cover plate main body is T, unit is mm;The size of the flanging portion in the thickness direction of the cover plate main body is B, unit is mm;B=0.5mm~0.6×T.

[0011] Preferably, the first insulating piece is wrapped around the circumferential sidewall of the pole; in the radial direction of the pole, the thickness dimension of the portion between the flange portion and the pole is A, A=0.5mm-2mm.

[0012] Preferably, the end of the pole facing the outside of the battery cell protrudes out of the first insulating piece;

[0013] In the thickness direction of the cover plate body, the distance between the surface of the pole facing the outside of the battery cell and the first insulating piece is C, C=0.2mm-1mm.

[0014] Preferably, in the thickness direction of the cover plate body, the distance between the surface of the pole facing the inside of the battery cell and the surface of the cover plate body facing the inside of the battery cell is H, H=-2.5mm-3mm; when H is positive, the end of the pole facing the inside of the battery cell protrudes out of the side of the cover plate body facing the inside of the battery cell; when H is negative, the side of the cover plate body facing the inside of the battery cell protrudes out of the end of the pole facing the inside of the battery cell.

[0015] Preferably, the thickness dimension of the cover plate body is T, unit: mm; the dimension of the flange portion in the thickness direction of the cover plate body is B, unit: mm; B=0.5mm-0.6xT.

[0016] Preferably, the dimension of the convex portion in the thickness direction of the cover plate body is Y, unit: mm; Y=0.5mm-0.5xT.

[0017] Preferably, the dimension of the limiting boss in the thickness direction of the cover plate body is K, K=0.5mm-2mm.

[0018] Preferably, the side of the first insulating piece facing the cover plate body is formed with a protruding first rotation-stopping portion, and the hole wall of the mounting hole is provided with a first rotation-stopping groove for the first rotation-stopping portion to extend into.

[0019] Preferably, the side of the first insulating piece facing the pole is formed with a protruding second rotation-stopping portion, and the limiting boss is provided with a second rotation-stopping groove for the second rotation-stopping portion to extend into.

[0020] Preferably, further comprising:

[0021] A second insulating piece is arranged on the side of the cover plate body facing the inside of the battery cell.

[0022] The second aspect of the utility model provides a battery cell cover.

[0023] Compared with the prior art, the utility model has the advantages of:

[0024] The electric core cover plate of the utility model, the extension part is formed with outward protruding on the side of the installation hole of the cover plate main body facing the outside of the electric core, the end of the extension part away from the cover plate main body is bent towards the direction close to the pole column to form the flanging part, the hole wall of the installation hole is formed with the convex part extending towards the direction close to the pole column, the convex part and the flanging part are arranged in the thickness direction of the cover plate main body to enclose the groove;The circumferential side wall of the pole column is formed with the limiting boss extending outward, the limiting boss extends into the groove, thus the riveting block in the traditional cover plate is saved, the pole column is directly assembled on the cover plate main body, the assembly process of the electric core cover plate is saved, the production process of the electric core cover plate is simplified, the production efficiency of the electric core cover plate is improved, and the production cost is reduced.In addition, the first insulating piece is clamped between the installation hole and the pole column to insulate and protect the cover plate main body, and the sealing piece is clamped between the limiting boss and the convex part, so that the sealing property of the electric core cover plate is guaranteed, the yield of the electric core cover plate is guaranteed, and the safety performance of the electric core is further guaranteed, the thickness size of the cover plate main body is T, and the unit is mm;The size of the flanging part in the thickness direction of the cover plate main body is B, and the unit is mm;B=0.5mm~0.6*T, thus the flanging part has sufficient structural strength to guarantee the effective pressure connection of the limiting boss and the effective compression of the sealing piece, and the compression amount of the sealing piece is guaranteed.

[0025] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0027] Figure 1 The structural schematic diagram of the electric core cover plate provided by the utility model embodiment is shown;

[0028] Figure 2 The structural schematic diagram of the electric core cover plate provided by the utility model embodiment is shown;

[0029] Figure 3 The structural schematic diagram of the electric core cover plate provided by the utility model embodiment is shown;

[0030] Figure 4 The structural schematic diagram of the electric core cover plate provided by the utility model embodiment is shown; Figure 3 The sectional view of the electric core cover plate provided by the utility model embodiment is shown;

[0031] Figure 5 The structural schematic diagram of the electric core cover plate provided by the utility model embodiment is shown; Figure 4An enlarged structural schematic view at M;

[0032] Figure 6 As Figure 4 An enlarged structural schematic view at N;

[0033] Figure 7 As Figure 3 A sectional view taken along F-F;

[0034] Figure 8 An exploded structural schematic view of the battery cell cover plate provided by the embodiment of the utility model.

[0035] Icon: 10-cover plate main body;11-mounting hole;12-clamping part;101-extension;102-flange part;103-convex part;104-first rotation stopping groove;20-pole;21-limiting boss;201-second rotation stopping groove;31-first insulating piece;311-first rotation stopping part;312-second rotation stopping part;32-second insulating piece;321-clamping groove;40-sealing piece. DETAILED DESCRIPTION

[0036] The following detailed description is presented to aid in understanding the method, device and / or system described herein. It will be apparent, however, that changes, modifications and equivalents can be made by those of ordinary skill in the art to the method, device and / or system described herein without departing from the disclosure. For example, the order in which operations are described is not necessarily the order in which the operations are performed, and the operations can be combined or divided into further operations. Moreover, features described herein can be implemented in software, hardware, or a combination thereof. Furthermore, features described herein can be implemented as part of a larger system, or as part of a separate system.

[0037] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the method, device and / or system to others skilled in the art. Further, the description should not be construed as limiting the described examples and should be understood to include any legally recognized equivalents.

[0038] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0039] As used herein, the term "and / or" includes any one of the listed items and any combination of two or more of the listed items.

[0040] Although terms such as "first" and "second" and "third" can be used herein to describe various components, assemblies, regions, layers or sections, these components, assemblies, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, assembly, region, layer or section from another component, assembly, region, layer or section. Thus, a component, assembly, region, layer or section referred to as a first component, assembly, region, layer or section in one example described herein can also be referred to as a second component, assembly, region, layer or section in another example without departing from the teachings of the examples.

[0041] For ease of description, spatial terms such as "on", "upper", "below", and "lower" can be used with respect to the orientation of one element relative to another element as illustrated in the figures. Such spatial terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, a component described as on "top" or the "upper" relative to another component would then be oriented on the "bottom" or "lower" relative to the other component. Accordingly, the term "on" encompasses both a position "on" as well as a position "under" depending on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate modification to the spatial terms would be made to those of skill in the art in light of the disclosure.

[0042] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including" and "has" are inclusive and permit the presence of one or more other features, numbers, operations, members, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, members, elements and / or combinations thereof.

[0043] Variations in the shapes illustrated in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include variations in shapes that occur during manufacturing.

[0044] Features of the examples described herein can be combined with one another as would be apparent to one of ordinary skill in the art after understanding the disclosure provided herein. Furthermore, although examples described herein have a variety of configurations, other configurations are possible as would be apparent to one of ordinary skill in the art after understanding the disclosure provided herein.

[0045] According to a first aspect of the present application, an electric core cover plate is provided, which specifically comprises a cover plate body 10, a pole 20, a first insulating part 31 and a sealing part 40.

[0046] In the following, the specific structure of the electric core cover plate according to the present embodiment will be described.

[0047] In the present embodiment, as shown in Figures 1 to 3 and Figure 8 , the cover plate body 10 is formed as a plate structure, which can be a rectangular plate structure when the electric core is a square shell electric core or a blade electric core, or a circular plate structure when the electric core is a cylindrical electric core. The cover plate body 10 is provided with a mounting hole 11 penetrating through the thickness direction thereof, i.e., the mounting hole 11 is a through hole structure. The pole 20 is assembled in the mounting hole 11, one end of the pole 20 facing the inside of the electric core is connected with the pole group inside the electric core, and the other end of the pole 20 facing the outside of the electric core is connected with the busbar.

[0048] Specifically, as shown in Figure 4 , Figure 7 and Figure 8As shown, the side of the mounting hole 11 facing the outside of the battery cell is formed with an outwardly protruding extension 101, the extension 101 is formed in an annular structure surrounding the side wall of the pole 20, the end of the extension 101 away from the cover plate body 10 is bent towards the pole 20 to form a flange 102, so as to limit the end of the pole 20 facing the outside of the shell, so that the flange 102 can fix the pole 20 to the cover plate body 10. The hole wall of the mounting hole 11 is formed with a protrusion 103 extending towards the pole 20, the protrusion 103 and the flange 102 are arranged in the thickness direction of the cover plate body 10 to form a groove; the circumferential side wall of the pole 20 is formed with an outwardly extending limiting boss 21, the limiting boss 21 extends into the groove to limit the end of the pole 20 facing the inside of the shell; such arrangement eliminates the riveting block of the traditional cover plate, so that the pole 20 is directly assembled on the cover plate body 10, and the flange 102 and the protrusion 103 fix the installation position of the pole 20 relative to the cover plate body 10, thereby saving the assembly process of the battery cell cover plate, simplifying the production process of the battery cell cover plate, improving the production efficiency of the battery cell cover plate, and reducing the production cost.

[0049] In the embodiment, as shown in Figures 1 to 8 The first insulating piece 31 is clamped between the mounting hole 11 and the pole 20 to insulate and protect the cover plate body 10, avoiding short circuit caused by contact between the cover plate body 10 and the pole 20, and the first insulating piece 31 can be made of PP or PPS insulating material; the sealing piece 40 is formed in an annular structure, and the sealing piece 40 can be a sealing ring, which is sleeved on the circumferential side wall of the pole 20 and clamped between the limiting boss 21 and the protrusion 103 in the thickness direction of the cover plate body 10, so that the sealing piece 40 is kept in a compressed state after the assembly of the battery cell cover plate, thereby ensuring the sealing performance of the battery cell cover plate and improving the yield of the battery cell cover plate.

[0050] Preferably, the flange 102 and the protrusion 103 are both formed in a closed annular structure, so as to ensure effective compression of the entire sealing piece 40 and ensure the air tightness of the battery cell cover plate.

[0051] Preferably, the protrusion 103 extends along the radial direction of the pole 20 and is arranged in parallel with the flange 102.

[0052] In the embodiment, as shown in Figure 4 and Figure 5As shown, the first insulating member 31 covers the circumferential sidewall of the pole post 20; in the radial direction of the pole post 20, the thickness of the portion of the first insulating member 31 located between the flange portion 102 and the pole post 20 is A, where A = 0.5mm to 2mm. This avoids the insulation failure caused by A being too small, which could easily lead to a short circuit, and also avoids the increased cost caused by A being too large, which could affect the size of the pole post 20 and thus reduce its current carrying capacity. It should be noted that in this embodiment, the axial direction of the pole post 20 is... Figure 5 In the vertical direction from a visual perspective, the radial direction of pole post 20 is perpendicular to the axial direction of pole post 20.

[0053] In this embodiment, as Figure 4 and Figure 5 As shown, the first insulating member 31 extends from the end of the electrode post 20 facing the outside of the cell, that is, in Figure 5 From the viewpoint shown, the upper surface of the pole post 20 is higher than the first insulating member 31, thereby facilitating the connection between the pole post 20 and the busbar as described above. In a preferred embodiment, as... Figure 5 As shown, in the thickness direction of the cover plate body 10, i.e. Figure 5 In the vertical direction from the perspective, the distance between the surface of the pole post 20 facing the outside of the cell and the first insulating component 31 is C, where C = 0.2mm to 1mm. This avoids the connection between the pole post 20 and the busbar being too small, and also avoids the cell volume being too large, which would reduce the energy density of the cell.

[0054] In this embodiment, as Figure 4 and Figure 6 As shown, in the thickness direction of the cover plate body 10, the surface of the electrode post 20 facing the inside of the cell (i.e., Figure 6 The lower surface of the electrode post 20 (from a visual perspective) and the surface of the cover plate body 10 facing the inside of the cell (i.e., Figure 6 The distance between the lower surfaces of the cover plate body 10 (from a certain angle) is H, where H = -2.5mm to 3mm; it should be noted that when H is positive, the end of the electrode post 20 facing the inside of the cell extends beyond the side of the cover plate body 10 facing the inside of the cell, that is, in Figure 6 From a certain perspective, the lower surface of the electrode post 20 is located below the lower surface of the cover plate body 10; when H is negative, the side of the cover plate body 10 facing the inside of the cell extends beyond the end of the electrode post 20 facing the inside of the cell, that is, in Figure 6 From this perspective, the lower surface of the pole post 20 is located above the lower surface of the cover body 10. This arrangement ensures the sealing of the cell cover assembly and avoids the pole post 20 from excessively occupying the internal space of the cell, thereby reducing the energy density of the cell.

[0055] In this embodiment, as Figure 4 and Figure 5As shown, the thickness dimension of the cover plate body 10 is T, in mm; the dimension of the turned edge portion 102 in the thickness direction of the cover plate body 10 is B, in mm; B = 0.5mm ~ 0.6xT, so as to ensure that the turned edge portion 102 has sufficient structural strength. If the dimension of B is too small, the turned edge portion 102 is prone to deformation, which cannot ensure effective pressure bonding of the limiting boss 21 and effective compression of the sealing element 40, and cannot ensure the compression amount of the sealing element 40, avoid the case of air-tightness failure of the battery cover, and avoid the case that the dimension of B is too large, which is not easy to bend during assembly, and is prone to over-pressing the sealing element 40, which leads to the case that the sealing element 40 is prone to wear or breakage, and reduces the service life of the sealing element 40.

[0056] In the present embodiment, as shown in Figure 4 and Figure 5 As shown, the dimension of the convex portion 103 in the thickness direction of the cover plate body 10 is Y, in mm; Y = 0.5mm ~ 0.5xT, so as to avoid the case that the dimension of Y is too small, which leads to the deformation of the convex portion 103, and avoid the case that the dimension of Y is too large, which affects the size of the pole 20, thereby affecting the connection strength and overcurrent capacity of the pole 20.

[0057] In the present embodiment, as shown in Figure 4 and Figure 6 As shown, the dimension of the limiting boss 21 in the thickness direction of the cover plate body 10 is K, K = 0.5mm ~ 2mm. If the dimension of K is too small, the limiting boss 21 is prone to deformation, which reduces the acting force of the limiting boss 21 on the sealing element 40, and affects the air-tightness of the battery cover. If the dimension of K is too large, it is not conducive to improving the energy density of the battery cell.

[0058] In the present embodiment, as shown in Figure 8 As shown, the side of the first insulating element 31 facing the cover plate body 10 is formed with a convex first rotation-stopping portion 311, which can be a protruding block structure. The hole wall of the mounting hole 11 is provided with a first rotation-stopping groove 104 for the first rotation-stopping portion 311 to extend into, so as to realize the limitation of the relative rotation between the first insulating element 31 and the cover plate body 10, avoid the wear of the first insulating element 31 due to rotation, and ensure the insulation performance of the first insulating element 31. In an alternative embodiment, a plurality of first rotation-stopping portions 311 are provided, and the first rotation-stopping grooves 104 are correspondingly provided one by one. The plurality of first rotation-stopping portions 311 are arranged at intervals in the circumferential direction of the first insulating element 31, so as to improve the rotation-stopping effect and effectively avoid the rotation of the first insulating element 31 relative to the cover plate body 10.

[0059] Further, in the present embodiment, as shown in Figure 8As shown, the side of the first insulating piece 31 facing the pole column 20 is formed with a protruding second rotation-stopping part 312, which is formed in a block structure, and the limiting boss 21 is provided with a second rotation-stopping groove 201 for the second rotation-stopping part 312 to extend into. After the first insulating piece 31 is assembled to the pole column 20, the second rotation-stopping part 312 extends into the second rotation-stopping groove 201 to limit the relative rotation between the first insulating piece 31 and the pole column 20, avoid wear of the first insulating piece 31, and further ensure the insulation performance of the first insulating piece 31. In an alternative implementation, a plurality of second rotation-stopping parts 312 are provided, and the second rotation-stopping groove 201 is provided in one-to-one correspondence with the second rotation-stopping part 312. The plurality of second rotation-stopping parts 312 are arranged at intervals in the circumferential direction of the second insulating piece 32, which improves the rotation-stopping effect and effectively avoids rotation of the second insulating piece 32 relative to the cover plate body 10.

[0060] In the preferred implementation, as shown in Figure 8 , the first rotation-stopping part 311, the first rotation-stopping groove 104, the second rotation-stopping part 312, and the second rotation-stopping groove 201 are provided in the structure of the battery cell cover plate, which limits the relative rotation between the pole column 20 and the cover plate body 10 and ensures that the pole column 20 is firmly and reliably fixed to the cover plate body 10. Preferably, the plurality of first rotation-stopping parts 311 and the plurality of second rotation-stopping parts 312 are alternately arranged and equally spaced from each other to ensure uniform stress.

[0061] In addition, in the present embodiment, as shown in Figures 1 to 8 , the battery cell cover plate further comprises a second insulating piece 32, which can be made of PP or PPS insulating material. The second insulating piece 32 is arranged on the side of the cover plate body 10 facing the inside of the battery cell to separate the cover plate body 10 from the pole group and the pole column 20 inside the battery cell, thereby further improving the insulation protection of the cover plate body 10.

[0062] In the present embodiment, as shown in Figure 2 , Figure 4 , and Figure 8 , the cover plate body 10 is provided with a clamping part 12 protruding towards the second insulating piece 32, which is formed in a clamping jaw structure with a protruding block at the end. The second insulating piece 32 is provided with a clamping groove 321, and the clamping part 12 extends into the clamping groove 321, which realizes the clamping connection between the second insulating piece 32 and the cover plate body 10 and improves the assembly efficiency of the battery cell cover plate.

[0063] Preferably, as shown in Figure 2 , Figure 4 , and Figure 8 ,As shown, the clamping portions 12 are provided with a plurality of at least four clamping portions 12 distributed at the four corners of the cover plate body 10, and the clamping grooves 321 are provided one by one corresponding to the clamping portions 12, so as to ensure the connection reliability of the cover plate body 10 and the second insulating piece 32, thereby improving the insulation protection performance of the second insulating piece 32 on the cover plate body 10.

[0064] According to the electric core cover provided by the utility model, the extension part is outward protruded on the side of the installation hole of the cover plate body facing the outside of the electric core, one end of the extension part away from the cover plate body is bent towards the direction close to the pole column to form the flanging part, the hole wall of the installation hole is formed with the convex part extending towards the direction close to the pole column, and the convex part and the flanging part are arranged in the thickness direction of the cover plate body to form the groove; the circumferential side wall of the pole column is formed with the limiting boss extending outward, and the limiting boss extends into the groove, so that the riveting block in the traditional cover plate is omitted, the pole column is directly assembled on the cover plate body, the assembly process of the electric core cover is saved, the production process of the electric core cover is simplified, the production efficiency of the electric core cover is improved, and the production cost is reduced. In addition, the first insulating piece is clamped between the installation hole and the pole column to insulate and protect the cover plate body, and the sealing piece is clamped between the limiting boss and the convex part, so as to ensure the sealing performance of the electric core cover, ensure the yield of the electric core cover, the thickness of the cover plate body is T, and the unit is mm; the size of the flanging part in the thickness direction of the cover plate body is B, and the unit is mm; B = 0.5mm ~ 0.6xT, so that the flanging part has sufficient structural strength to ensure effective pressure connection of the limiting boss and effective compression of the sealing piece, and the compression amount of the sealing piece is ensured.

[0065] According to the electric core provided by the utility model, the electric core cover has all the beneficial effects of the electric core cover, and details are not repeated here.

[0066] Finally, it should be noted that: the above-described embodiments are merely specific implementations of the present application, which are used to illustrate the technical solutions of the present application, rather than limit them, and the protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art within the technical range disclosed by the present application can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electrode cover plate, characterized by, The electric cell cover plate comprises: a cover plate body provided with a mounting hole; a pole assembled in the mounting hole; an extension part protruding outward is formed on the side of the mounting hole facing the outside of the electric cell; the end of the extension part away from the cover plate body is bent towards the direction close to the pole to form a flange part; the hole wall of the mounting hole is provided with a protrusion extending towards the direction close to the pole; the protrusion and the flange part are arranged in the thickness direction of the cover plate body to form a groove; the circumferential side wall of the pole is provided with a limiting boss extending outward, and the limiting boss extends into the groove; a first insulating part arranged between the mounting hole and the pole; a sealing part arranged between the limiting boss and the protrusion; the thickness of the cover plate body is T (mm); the size of the flange part in the thickness direction of the cover plate body is B (mm); B = 0.5 mm to 0.6*T.

2. The cell cover plate of claim 1, wherein, The first insulating part covers the circumferential side wall of the pole; in the radial direction of the pole, the thickness of the part of the first insulating part between the flange part and the pole is A (mm), A = 0.5 mm to 2 mm.

3. The cell cover plate of claim 1, wherein, The end of the pole facing the outside of the electric cell extends out of the first insulating part; in the thickness direction of the cover plate body, the distance between the surface of the pole facing the outside of the electric cell and the first insulating part is C (mm), C = 0.2 mm to 1 mm.

4. The cell cover plate of claim 1, wherein, in the thickness direction of the cover plate body, the distance between the surface of the pole facing the inside of the electric cell and the surface of the cover plate body facing the inside of the electric cell is H (mm), H = -2.5 mm to 3 mm; when H is positive, the end of the pole facing the inside of the electric cell extends out of the side of the cover plate body facing the inside of the electric cell; when H is negative, the side of the cover plate body facing the inside of the electric cell extends out of the end of the pole facing the inside of the electric cell.

5. The cell cover plate of claim 1, wherein, the size of the protrusion in the thickness direction of the cover plate body is Y (mm); Y = 0.5 mm to 0.5*T.

6. The cell cover plate of claim 1, wherein, the size of the limiting boss in the thickness direction of the cover plate body is K (mm), K = 0.5 mm to 2 mm.

7. The cell cover plate of claim 1, wherein, the side of the first insulating part facing the cover plate body is provided with a protruding first rotation-stopping part, and the hole wall of the mounting hole is provided with a first rotation-stopping groove for the first rotation-stopping part to extend into.

8. The cell cover plate of claim 1, wherein, the side of the first insulating part facing the pole is provided with a protruding second rotation-stopping part, and the limiting boss is provided with a second rotation-stopping groove for the second rotation-stopping part to extend into.

9. The cell cover plate of claim 1, wherein, further comprising: a second insulating part arranged on the side of the cover plate body facing the inside of the electric cell.

10. An electric cell characterized by the electric cell cover plate according to any one of claims 1 to 9.

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