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 arranged in the mounting hole, and the section, perpendicular to the axis, of the pole is of a strip-shaped structure; the pole comprises a plate part, and a first boss, a second boss and a third boss which are sequentially arranged along the axial direction of the pole; the plate part is arranged on one side of the cover plate main body surface, and the first boss is connected with the plate part; the first boss and the third boss are formed by protruding outwards along the circumferential side wall of the second boss, the distance between the side wall of the first boss and the side wall of the second boss is e, and e is larger than 0 mm; the distance f between the side wall of the third boss and the side wall of the second boss is larger than or equal to 0.15 mm and smaller than or equal to 2mm. Compared with a traditional pole with a circular section, the over-current capacity is improved, the problem of insufficient over-current of a pole on a narrow battery cell cover plate in the prior art is solved, and the use requirement of a battery cell is met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural components of lithium-ion batteries are also an important part of lithium-ion power batteries. It not only provides protection for lithium-ion batteries in terms of safety and reliability, but also takes into account the connection between the internal chemical system of lithium-ion batteries and external modules. The battery cover plate on the lithium-ion battery is an important component of the lithium-ion battery. A pole column is arranged on the battery cover plate for power transmission. The cross-section of the existing pole column is mostly circular. For a battery cell with a relatively thin thickness and a relatively narrow cover plate width, the pole column is limited by the width of the cover plate and cannot be enlarged. In order to meet its over-current requirement, a multi-pole column scheme is often adopted on a single cover plate, but this leads to a high cost and a low production efficiency. In addition, the existing pole columns of battery cells are mostly formed by machining, with low material utilization rate and low processing efficiency, resulting in a high overall cost of the pole column. Summary of the Utility Model

[0003] In view of this, the purpose of this application is to provide a battery cell cover plate and a battery cell to solve the problem that the width dimension of the existing battery cell cover plate is relatively narrow, so that the size of the pole column is limited and its over-current requirement cannot be met.

[0004] The first aspect of the utility model provides a battery cell cover plate, wherein the battery cell cover plate includes:

[0005] A cover plate main body, which is provided with a mounting hole;

[0006] A pole column, which is arranged in the mounting hole, and the cross-section of the pole column perpendicular to its axis is a strip structure; the pole column includes a plate portion and a first boss, a second boss and a third boss arranged in sequence along the axial direction of the pole column; the plate portion is arranged on one side of the cover plate, and the first boss is connected to the plate portion; the first boss and the third boss protrude outwards along the circumferential side wall of the second boss, and the distance between the side wall of the first boss and the side wall of the second boss is e, e>0mm; the distance between the side wall of the third boss and the side wall of the second boss is f, 0.15mm≤f≤2mm.

[0007] Preferably, the cover plate main body is formed into a rectangular plate-like structure, and the cross-section of the strip-structured pole column extends along the length direction of the cover plate main body.

[0008] Preferably, the central axes of the first boss, the second boss and the third boss are arranged to coincide with each other.

[0009] Preferably, e ≥ 0.8 mm.

[0010] Preferably, 0.3 mm ≤ f ≤ 0.5 mm.

[0011] Preferably, the terminal post is formed by a punching process.

[0012] Preferably, the cell cover plate further comprises:

[0013] A connecting member disposed on the other side of the cover plate body; a connecting hole is formed in the connecting member, and the third boss and at least a part of the second boss are disposed in the connecting hole, and the third boss is welded to the connecting member to form a welding portion.

[0014] Preferably, the cell cover plate comprises a first cover plate and a second cover plate; the first cover plate is disposed on the positive electrode side of the cell, and the second cover plate is disposed on the negative electrode side of the cell.

[0015] Preferably, the cell cover plate further comprises:

[0016] A first insulating member disposed between the cover plate body and the terminal post;

[0017] The resistance value R1 of the first insulating member located on the first cover plate is 5 - 100000 Ω, or R1 > 200 MΩ; the resistance value R2 of the first insulating member located on the second cover plate is R2 > 200 MΩ.

[0018] The second aspect of the present invention provides a cell comprising the cell cover plate according to any one of the above technical solutions.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The cell cover plate of the present invention has low cost and high processing efficiency. The terminal post on the cover plate body is formed into a bar-shaped structure with a cross-section perpendicular to its axis. Thus, compared with the traditional terminal post with a circular cross-section, its current-carrying capacity is increased, and the problem of insufficient current-carrying capacity of the terminal post on the relatively narrow cell cover plate in the prior art is solved; the terminal post comprises a plate portion and a first boss, a second boss and a third boss arranged in sequence along the axial direction of the terminal post; the plate portion is disposed on the side of the cover plate body facing the inside of the cell, and the first boss is connected to the plate portion; the first boss and the third boss protrude outward along the circumferential side wall of the second boss, and the distance between the side wall of the first boss and the side wall of the second boss is e, e > 0 mm, so as to avoid the situation of the first boss collapsing; the distance between the side wall of the third boss and the side wall of the second boss is f, 0.15 mm ≤ f ≤ 2 mm, which ensures the structural strength of the third boss to avoid the terminal post falling off, and also avoids the third boss occupying too much size of the cover plate body in its width direction, ensuring the structural strength of the cover plate body, thereby meeting the use requirements of the cell.

[0021] To make the above objects, features, and advantages of the present application more obvious and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and makes a detailed description as follows. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Exploded structural schematic diagram of the second cover plate in the cell cover plate provided by the embodiment of the present utility model;

[0024] Figure 2 Structural schematic diagram of the second cover plate in the cell cover plate provided by the embodiment of the present utility model;

[0025] Figure 3 Structural schematic diagram of the second cover plate in the cell cover plate provided by the embodiment of the present utility model from another perspective;

[0026] Figure 4 Structural cross-sectional view of the second cover plate in the cell cover plate provided by the embodiment of the present utility model;

[0027] Figure 5 Exploded structural schematic diagram of the first cover plate in the cell cover plate provided by the embodiment of the present utility model;

[0028] Figure 6 Structural schematic diagram of the first cover plate in the cell cover plate provided by the embodiment of the present utility model;

[0029] Figure 7 Structural schematic diagram of the first cover plate in the cell cover plate provided by the embodiment of the present utility model from another perspective;

[0030] Figure 8 Structural schematic diagram of the terminal post in the cell cover plate provided by the embodiment of the present utility model;

[0031] Figure 9 Structural schematic diagram of the terminal post in the cell cover plate provided by the embodiment of the present utility model in the length direction of the cover plate body;

[0032] Figure 10 Structural schematic diagram of the dimensional relationship between the plate part, the first boss, the second boss, and the third boss of the terminal post in the cell cover plate provided by the embodiment of the present utility model in the length direction of the cover plate body;

[0033] Figure 11Schematic diagram of the structure of the pole column in the width direction of the cover body of the battery cell cover plate provided by the embodiment of the present utility model;

[0034] Figure 12 Schematic diagram of the dimensional relationship structure of the plate part, the first boss, the second boss and the third boss of the pole column in the width direction of the cover body of the battery cell cover plate provided by the embodiment of the present utility model;

[0035] Figure 13 Schematic diagram of the assembly structure of the battery cell cover plate and the housing provided by the embodiment of the present utility model.

[0036] Reference numerals: 10 - cover body; 11 - mounting hole; 101 - first cover plate; 102 - second cover plate; 20 - pole column; 21 - plate part; 22 - first boss; 23 - second boss; 24 - third boss; 31 - first insulating member; 32 - second insulating member; 40 - sealing member; 50 - connecting member; 51 - connecting hole; 60 - welding part; 70 - liquid injection hole; 80 - pressure relief member; 100 - housing; 110 - first opening; 120 - second opening. Detailed embodiments

[0037] The following detailed embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0038] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0039] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" the other element, "connected to" the other element, "coupled to" the other element, "above" the other element, or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0040] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0041] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, the first component, element, region, layer, or part described in the examples herein may also be referred to as the second component, element, region, layer, or part without departing from the teachings of the examples.

[0042] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include 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 flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0043] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising", "including" and "having" enumerate the stated features, quantities, operations, components, elements and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0044] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0045] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0046] According to a first aspect of the present utility model, a battery cell cover plate is provided, which specifically includes a cover plate main body 10 and a pole column 20.

[0047] Hereinafter, the specific structure of the battery cell cover plate according to the present embodiment will be described.

[0048] In the present embodiment, as Figures 1 to 7 and Figure 13 shown, the cover plate main body 10 is formed into a plate-like structure, and a cavity structure for accommodating a pole group is provided inside the battery cell housing 100. An opening is provided at the end of the cavity structure, and the cover plate main body 10 is welded to the housing 100 to close the opening. An installation hole 11 is formed in the cover plate main body 10, and the installation hole 11 is formed into a through-hole structure penetrating along the thickness direction of the cover plate main body 10.

[0049] As Figures 1 to 8 shown, the pole column 20 is disposed in the installation hole 11, and both ends of the pole column 20 in the axial direction extend out of the installation hole 11 respectively. In this way, a part of the pole column 20 is located inside the battery cell and is connected to the pole ear on the pole group, while a part of the pole column 20 is located outside the battery cell, thus playing a role in voltage extraction.

[0050] Furthermore, in the present embodiment, the cross-section of the pole column 20 perpendicular to its axis is a strip structure. In this way, compared with the traditional pole column 20 with a circular cross-section, its current-carrying capacity is increased, and the problem of insufficient current-carrying of the pole column 20 on the battery cell cover plate with a relatively narrow width in the prior art is solved.

[0051] In the present embodiment, as shown in 1 to Figure 7As shown, the cover plate main body 10 is formed into a rectangular plate-like structure such that the dimension of the cover plate main body 10 in the length direction is greater than the dimension of the cover plate main body 10 in the width direction, and the length direction of the cover plate main body 10 is perpendicular to the width direction of the cover plate main body 10. The cross-section of the strip-shaped pole column 20 extends along the length direction of the cover plate main body 10, so as to maximize the length dimension of the cross-section of the pole column 20 and prevent the pole column 20 from excessively occupying the dimension of the cover plate main body 10 in the width direction and affecting the structural strength of the cover plate main body 10.

[0052] The cross-section of the pole column 20 perpendicular to its axis can be an elliptical, kidney-shaped or strip-shaped structure.

[0053] Specifically, as Figures 8 to 12 shown, the pole column 20 includes a plate portion 21 and a first boss 22, a second boss 23 and a third boss 24 arranged in sequence along the axial direction of the pole column 20, that is, the second boss 23 is arranged between the first boss 22 and the third boss 24; the plate portion 21 is arranged on the side of the cover plate main body 10 facing the inside of the battery cell, and the plate portion 21 can be formed into a rectangular plate-like structure. The first boss 22 is connected to the plate portion 21, so that the third boss 24 is arranged on one side of the cover plate main body 10, specifically, on one side in the thickness direction of the cover plate main body 10.

[0054] In this embodiment, the shapes of the first boss 22, the second boss 23 and the third boss 24 in the cross-section perpendicular to the axis of the pole column 20 are the same.

[0055] More specifically, as Figure 9 and Figure 11 shown, the first boss 22 and the third boss 24 protrude outward along the circumferential side wall of the second boss 23, so that the dimensions of the first boss 22 and the third boss 24 in the length direction and / or the width direction of the battery cell cover plate are both greater than the dimension of the second boss 23 (i.e., c 长 <d 长 ,c 宽 <d 宽 ,c 长 <b 长 ,c 宽 <b 宽 ), and the dimensions of the first boss 22, the second boss 23 and the third boss 24 in the length direction and / or the width direction of the battery cell cover plate are all smaller than the dimension of the plate portion 21 (i.e., b 长 <a 长 ,b 宽 <a 宽 ,c 长 <a 长 ,c 宽 <a 宽 ,d 长 <a 长 ,d 宽 <a宽 ), where a 长 >a 宽 , b 长 >b 宽 , c 长 >c 宽 , d 长 >d 宽 It should be noted that the dimensions with the subscript "width" in the above-mentioned dimension markings represent the dimensions in the width direction of the cover plate, and the dimensions with the subscript "length" represent the dimensions in the length direction of the cover plate.

[0056] In a preferred embodiment, the pole 20 is formed by a pier pressing process, so that the pole 20 can be formed in one piece without additional machining process, so that the production efficiency of the pole 20 is improved and the cost of the pole 20 is reduced. Preferably, the third boss 24 is formed by stamping and expanding the material, that is, the pole 20 passes through the mounting hole 11 and is plugged into the connector 50 described below, and then riveted with the step on the connecting hole 51 to achieve the fixation of the pole 20 relative to the cover plate body 10. In other optional embodiments, the pole 20 is prepared by CNC (numerical control machining) process.

[0057] In this embodiment, the distance between the side wall of the first boss 22 and the side wall of the second boss 23 is e, e>0mm, preferably e≥0.8mm, so as to avoid the cold pressing mold being easily expanded, and the edges of the first boss 22 are easily collapsed, which makes the first boss 22 difficult to form; the distance between the side wall of the third boss 24 and the side wall of the second boss 23 is f, 0.15mm≤f≤2mm, preferably 0.3mm≤f≤0.5mm, so as to meet the requirements of the molding and expansion of the third boss 24 and ensure the structural strength of the third boss 24. If the size of f is too small and the structural strength is insufficient, the pole 20 is easy to fall off the connecting piece 50. If the size of f is too large, the third boss 24 will excessively occupy the size of the cover body 10 in its width direction, so that the structural strength of the cover body 10 cannot be guaranteed.

[0058] In this embodiment, the central axes of the first boss 22, the second boss 23 and the third boss 24 are arranged to overlap with each other, so that the first boss 22 and the third boss 24 have the same protruding size relative to the second boss 23 throughout the entire circumference, thereby ensuring the structural strength of the pole 20 and improving the connection reliability of the pole 20.

[0059] In an optional embodiment, the central axis of the plate portion 21 can be coaxially arranged with the central axis of the first boss 22, the second boss 23 and the third boss 24 as described above; in other optional embodiments, the central axis of the plate portion 21 is not coaxial with the central axis of the first boss 22, the second boss 23 and the third boss 24 as described above, that is, the plate portion 21 is eccentrically arranged.

[0060] In addition, in this embodiment, if Figures 1 to 7 As shown, the cell cover plate also includes a connector 50, which is a block structure and is arranged on the other side of the cover plate body 10, specifically on the side opposite to the third boss 24 in the thickness direction of the cover plate body 10; a connecting hole 51 is opened on the connector 50, and the connecting hole 51 is formed as a stepped hole, that is, the inner wall of the connecting hole 51 is formed with a step that can be riveted and positioned with the third boss 24, and the third boss 24 and at least part of the second boss 23 are arranged in the connecting hole 51, and the third boss 24 is welded to the connector 50 to form a welding portion 60. In order to reduce the internal resistance and ensure the strength, after riveting, the outer track of the upper end surface of the third boss 24 of the pole 20 is welded to the matching area of the connector 50 to form a welding portion 60.

[0061] In this embodiment, if Figures 1 to 13 As shown, the battery cell cover includes a first cover 101 and a second cover 102; the first cover 101 is arranged on the positive electrode side of the battery cell, the pole 20 on the first cover 101 is connected to the positive electrode ear on the electrode group, and the pole 20 on the first cover 101 is made of copper; the second cover 102 is arranged on the negative electrode side of the battery cell, the pole 20 on the second cover 102 is connected to the negative electrode ear on the pole 20, and the pole 20 on the second cover 102 is made of aluminum.

[0062] like Figure 13 As shown, two openings are provided on the battery cell shell 100, namely a first opening 110 and a second opening 120, and the first opening 110 and the second opening 120 can be arranged on both sides of the shell 100 opposite to each other, wherein the first cover plate 101 is installed on the first opening 110, and the second cover plate 102 is installed on the second opening 120.

[0063] Preferably, a pole 20 is provided on each of the first cover plate 101 and the second cover plate 102, and the overcurrent requirement is ensured by increasing the size of the pole 20 in the length direction of the cover plate; however, in other optional embodiments, multiple poles 20 may also be provided on the first cover plate 101 and / or the second cover plate 102. When multiple poles 20 are provided on each cover plate body 10, the multiple poles 20 can be arranged sequentially along the length direction of the cover plate body 10.

[0064] In addition, in this embodiment, if Figures 1 to 7As shown, a liquid injection hole 70 is also formed in the cover plate main body 10. The liquid injection hole 70 is a through-hole structure penetrating the cover plate main body 10. After the battery cell cover plate is assembled with the housing 100, electrolyte is injected into the interior of the battery cell through the liquid injection hole 70. In addition, the battery cell cover plate further includes a pressure relief member 80 assembled on the cover plate main body 10. The pressure relief member 80 can be an explosion-proof valve. When the battery cell fails and generates gas, causing the internal pressure to reach the opening pressure, the pressure relief member 80 opens to connect the interior and exterior of the battery cell, so as to play a role in pressure relief and ensure the safety of the battery cell during use. The liquid injection hole 70 and the pressure relief member 80 are preferably arranged on different cover plate main bodies 10. For example, the liquid injection hole 70 is arranged on the second cover plate 102, and the pressure relief member 80 is arranged on the first cover plate 101.

[0065] In this embodiment, as Figures 1 to 7 shown, the battery cell cover plate further includes a first insulating member 31 and a second insulating member 32. The first insulating member 31 is arranged on the side of the cover plate main body 10 facing the outside of the battery cell, and the second insulating member 32 is arranged on the side of the cover plate main body 10 facing the inside of the battery cell. The first insulating member 31 is arranged between the cover plate main body 10 and the pole column 20 to play an insulating role between the cover plate main body 10 and the pole column 20. At least part of the first insulating member 31 covers the circumferential side wall of the connecting member 50 to play an insulating and protective role. The material of the first insulating member 31 can be PPS (polyphenylene sulfide); preferably, the resistance value R1 of the first insulating member 31 located on the first cover plate 101 is 5 - 100000 Ω, or R1 > 200 MΩ, so as to meet the insulation requirements on the positive electrode side of the battery cell; the resistance value R2 of the first insulating member 31 located on the second cover plate 102 is R2 > 200 MΩ, so as to meet the insulation requirements on the negative electrode side of the battery cell. The second insulating member 32 is formed into a strip structure to play a role in isolating the cover plate main body 10 from the interior of the battery cell. Part of the second insulating member 32 is clamped between the plate portion 21 and the cover plate main body 10 to play an insulating role between the pole column 20 and the cover plate main body 10.

[0066] In addition, the battery cell cover plate further includes a sealing member 40. The sealing member 40 can be an elastic sealing ring. The sealing member 40 is formed into an annular structure to surround the circumferential side wall of the first convex portion. At least part of the sealing member 40 is clamped between the side wall of the pole column 20 and the hole wall of the mounting hole 11; in the thickness direction of the cover plate main body 10, the sealing member 40 is pressed between the cover plate main body 10 and the plate portion 21 to ensure the sealing of the interior of the battery cell after the battery cell cover plate is assembled with the housing 100.

[0067] According to a cell cover plate provided by the present utility model, it has low cost and high processing efficiency. The pole column on the cover plate body is formed into a strip structure with a cross-section perpendicular to its axis. In this way, compared with the traditional pole column with a circular cross-section, its current-carrying capacity is increased, and the problem of insufficient current-carrying of the pole column on the cell cover plate with a relatively narrow width in the prior art is solved; the pole column includes a plate portion and a first boss, a second boss, and a third boss arranged in sequence along the axial direction of the pole column; the plate portion is arranged on the side of the cover plate body facing the inside of the cell, and the first boss is connected to the plate portion; the first boss and the third boss protrude outward along the circumferential side wall of the second boss, and the distance between the side wall of the first boss and the side wall of the second boss is e, e > 0 mm, to avoid the situation of the first boss collapsing; the distance between the side wall of the third boss and the side wall of the second boss is f, 0.15 mm ≤ f ≤ 2 mm, to ensure the structural strength of the third boss to avoid the pole column falling off, and also avoid the third boss occupying too much of the size of the cover plate body in its width direction, and ensure the structural strength of the cover plate body.

[0068] According to a cell provided by the present utility model, it includes the cell cover plate as described above, and thus has all the beneficial effects of the cell cover plate, which will not be elaborated here.

[0069] Finally, it should be noted that: the above-described embodiments are only specific embodiments of the present application, used to illustrate the technical solutions of the present application, rather than limiting it. 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 of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within 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. A battery cell cover plate, characterized in that, The cell cover plate includes: A cover plate body, which is provided with a mounting hole; A pole column, which is arranged in the mounting hole. The cross-section of the pole column perpendicular to its axis is a strip structure. The pole column includes a plate part, a first boss, a second boss and a third boss arranged in sequence along the axial direction of the pole column. The plate part is arranged on one side of the cover plate body, and the first boss is connected to the plate part. The first boss and the third boss protrude outward along the circumferential side wall of the second boss. The distance between the side wall of the first boss and the side wall of the second boss is e, and e > 0 mm. The distance between the side wall of the third boss and the side wall of the second boss is f, and 0.15 mm ≤ f ≤ 2 mm.

2. The cell cover plate according to claim 1, wherein, The cover plate body is formed into a rectangular plate-like structure, and the cross-section of the strip-structured pole column extends along the length direction of the cover plate body.

3. The cell cover plate according to claim 1, wherein, The central axes of the first boss, the second boss and the third boss are arranged to coincide with each other.

4. The cell cover plate according to claim 1, wherein, e ≥ 0.8 mm.

5. The cell cover plate according to claim 1, wherein 0.3 mm ≤ f ≤ 0.5 mm.

6. The cell cover plate according to claim 1, wherein The pole column is formed by a stamping process.

7. The cell cover plate according to claim 1, characterized in that, The cell cover plate further includes: A connecting piece, which is arranged on the other side of the cover plate body. A connecting hole is provided on the connecting piece. The third boss and at least part of the second boss are arranged in the connecting hole, and the third boss is welded to the connecting piece to form a welding part.

8. The cell cover plate according to claim 1, characterized in that, The cell cover plate includes a first cover plate and a second cover plate. The first cover plate is arranged on the positive electrode side of the cell, and the second cover plate is arranged on the negative electrode side of the cell.

9. The cell cover plate according to claim 8, characterized in that, The cell cover plate further includes: A first insulating part, which is arranged between the cover plate body and the pole column; The resistance value R1 of the first insulating part on the first cover plate is 5 - 100000 Ω, or R1 > 200 MΩ. The resistance value R2 of the first insulating part on the second cover plate is R2 > 200 MΩ.

10. A battery cell, characterized in that, The cell cover plate according to any one of claims 1 to 9.

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