Cell cover and cell

Abstract

This invention relates to the field of battery technology, and in particular to a cell cover and a cell. The cell cover includes: a cover body with mounting holes; a terminal post disposed in the mounting holes, the terminal post including a post body and a first plate body, the first plate body being disposed at the end of the terminal post facing the outside of the cell and protruding outward from the side wall of the post body, the distance between the side wall of the first plate body and the side wall of the post body being L; the distance between the side wall of the post body and the wall of the mounting hole being M, where L > M; and a first insulating member sandwiched between the first plate body and the cover body. This invention eliminates the riveting block structure in traditional cell cover panels, allowing the first plate body on the terminal post to directly press the first insulating member onto the cover body, thereby facilitating assembly and reducing costs; it also reduces the space and weight occupied by the cover, increasing the energy density of the cell. Furthermore, by limiting L > M, it prevents the terminal post from detaching under external impact, thereby improving the safety performance of the cell cover.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cell cover and a cell. Background Technology

[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. They not only ensure the safety and reliability of lithium-ion batteries, but also take care of the connection between the internal chemical system of lithium-ion batteries and external modules.

[0003] Existing battery cell covers use a structure where the terminals and rivet blocks are riveted together. The terminals and rivet blocks are pre-riveted and then connected by laser welding to assemble the terminals. This process is complex and costly. Since the rivet blocks and terminals are not a single unit, there is welding resistance, which can lead to a higher internal resistance of the battery. Riveting the terminals and rivet blocks requires the rivet blocks to be quite thick, making the overall thickness of the battery cell cover too high and occupying too much space, thus affecting the energy density of the battery cell and increasing the weight and production cost of the battery cell cover. In addition, the connection between the rivet blocks and terminals in the riveted structure is located outside the cover. The battery cell is often subjected to compressive force in the module or the entire package, i.e., a force from the outside to the inside perpendicular to the cover. This poses a risk that the terminals may detach from the rivet blocks, causing short circuits and, in severe cases, leading to the failure of the entire package, fire, or explosion. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a cell cover plate and a cell to solve the problems of high cost, complex processing, increased internal resistance of the cell, and reduced energy density of the cell due to the installation structure of the pole and rivet block on the existing cell cover plate. Under external pressure, the pole is prone to fall off the rivet block, resulting in short circuit and connection.

[0005] A first aspect of the present invention provides a battery cell cover plate, wherein the battery cell cover plate comprises:

[0006] The cover plate body has mounting holes;

[0007] An electrode post is disposed in the mounting hole. The electrode post includes a post body, a first plate body, and a second plate body. The first plate body is disposed at the end of the electrode post facing the outside of the battery cell and protrudes outward from the side wall of the post body. The second plate body is disposed at the end of the electrode post facing the inside of the battery cell and protrudes outward from the side wall of the post body. The distance between the side wall of the first plate body and the side wall of the post body is L. The distance between the side wall of the post body and the wall of the mounting hole is M, where L > M.

[0008] The first insulating element is sandwiched between the first plate body and the cover plate body;

[0009] A sealing element, sandwiched between the cover plate body and the second plate portion, has a dimension 'a' (in mm) in the thickness direction of the cover plate body before compression, and a dimension 'b' (in mm) in the thickness direction of the cover plate body after compression; the compression amount of the sealing element is...

[0010] when hour, when hour,

[0011] Wherein, S is the contact area between the sealing element and the cover plate body, in mm. 2 ;σ b A is the tensile strength of the material of the first plate part, in MPa; A is the perimeter of the connection between the first plate part and the column part, in mm; c is the thickness of the first plate part in the thickness direction of the cover plate body, in mm.

[0012] Preferably, the first plate portion and / or the second plate portion are expanded by stamping to make them protrude outward relative to the sidewall of the column portion;

[0013] Alternatively, the first plate portion and / or the second plate portion may be formed as a separate structure with the column portion.

[0014] Preferably, 0.8mm≤L≤5mm.

[0015] Preferably, 0.5mm≤c≤5mm.

[0016] Preferably, at least a portion of the first insulating element covers the circumferential sidewall of the first plate body.

[0017] Preferably, the cell cover further includes:

[0018] A second insulating element is disposed on the side of the cover plate body facing the inside of the cell; a portion of the first insulating element extends between the cover plate body and the second plate body portion.

[0019] Preferably, the sealing member is sleeved on the circumferential sidewall of the column portion, and at least a portion of the first insulating member extends between the sidewall of the column portion and the wall of the mounting hole, such that the first insulating member is pressed against the sealing member.

[0020] Preferably, multiple terminals are provided, and the multiple terminals include positive terminals and negative terminals.

[0021] Preferably, the cover plate body is provided with an injection hole and an vent hole;

[0022] The cell cover plate also includes:

[0023] A pressure relief component is provided at the vent.

[0024] A second aspect of the present invention provides a battery cell, including the battery cell cover plate described in any of the above technical solutions.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The battery cell cover of this invention eliminates the riveting block structure found in traditional battery cell cover plates. This allows the first plate portion on the electrode post to directly press the first insulating component onto the cover plate body, thus eliminating the welding process between the riveting block and the electrode post. This avoids increased welding resistance leading to higher internal resistance in the battery cell, facilitating assembly and reducing costs. It also reduces the overall thickness of the battery cell cover plate, thereby reducing space and weight and increasing the energy density of the battery cell. Furthermore, by limiting the distance L between the sidewall of the first plate portion and the sidewall of the post portion to be greater than the distance M between the sidewall of the post portion and the wall of the mounting hole, the electrode post is securely mounted on the cover plate body, preventing it from detaching under external impact. Additionally, by limiting the relationship between the rebound force of the seal within the compression range and the structural strength of the first plate portion of the electrode post under different compression levels, reliable electrode post installation is ensured, further reducing the risk of the electrode post detaching from the battery cell cover plate. This improves the safety performance of the battery cell cover plate, resulting in a longer service life and better safety performance for the battery cell.

[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention;

[0030] Figure 2 This is an exploded structural diagram of the battery cell cover plate provided in an embodiment of the present invention;

[0031] Figure 3This is a schematic diagram of the battery cell cover plate provided in an embodiment of the present invention from another perspective;

[0032] Figure 4 This is a schematic diagram of the contact area between the sealing element and the main body of the cover plate in the battery cell cover plate provided in an embodiment of the present invention;

[0033] Figure 5 This is a structural cross-sectional view of the battery cell cover plate provided in an embodiment of the present invention;

[0034] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0035] Figure 7 This is a schematic diagram illustrating the dimensional relationship between the electrode post, the seal, and the main body of the cover plate in the battery cell cover plate provided in an embodiment of the present invention.

[0036] Icons: 10-Cover plate body; 11-Mounting hole; 12-Injection hole; 20-Pole post; 21-First plate body; 22-Post body; 23-Second plate body; 31-First insulating component; 32-Second insulating component; 40-Sealing component; 50-Pressure relief component. Detailed Implementation

[0037] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0038] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this 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, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0040] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

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

[0042] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations 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 relation terms used herein will be interpreted accordingly.

[0043] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

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

[0045] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0046] According to a first aspect of the present invention, a cell cover plate is provided, which specifically includes a cover plate body 10, an electrode post 20, and a first insulating member 31.

[0047] The specific structure of the cell cover plate according to this embodiment will be described below.

[0048] In this embodiment, as Figures 1 to 5 As shown, the cover plate body 10 is formed into a plate-like structure. Specifically, the cover plate body 10 can be a rectangular or circular plate-like structure. The cover plate body 10 is provided with mounting holes 11, which are formed into through holes that penetrate the cover plate body 10.

[0049] The electrode post 20 is disposed in the mounting hole 11, thereby fixing the position of the electrode post 20 relative to the cover plate body 10. Specifically, the electrode post 20 includes a first plate portion 21, a column portion 22 and a second plate portion 23 arranged sequentially along its axial direction. The first plate portion 21 is disposed at the end of the electrode post 20 facing the outside of the battery cell, and the second plate portion 23 is disposed at the end of the electrode post 20 facing the inside of the battery cell. Both the first plate portion 21 and the second plate portion 23 are formed by protruding outward from the side wall of the column portion 22, so that the axial cross section of the electrode post 20 is formed into a structure similar to the "I".

[0050] The cross-sections of the first plate portion 21, the column portion 22, and / or the second plate portion 23 perpendicular to the axial direction of the pole post 20 can be circular, polygonal, or elliptical. In this embodiment, the first plate portion 21 and / or the second plate portion 23 protruding relative to the column portion 22 can be formed by a stamping process after passing through the mounting hole 11 to achieve outward expansion of the sidewall relative to the column portion 22, or the first plate portion 21 and / or the second plate portion 23 and the column portion 22 can be formed as a separate structure, and the first plate portion 21 and / or the second plate portion 23 can be assembled to the end of the column portion 22 after the column portion 22 passes through the mounting hole 11, so that the first plate portion 21 and the second plate portion 23 are located at opposite ends of the column portion 22 in the axial direction.

[0051] The first insulating component 31 is sandwiched between the first plate body 21 and the cover plate body 10, thus eliminating the riveting block structure in the traditional cell cover plate. This allows the first plate body 21 on the pole post 20 to directly press the first insulating component 31 onto the cover plate body 10, thereby eliminating the welding process between the riveting block and the pole post 20, avoiding the situation where welding resistance increases the internal resistance of the cell, facilitating assembly and reducing costs. It also reduces the overall thickness of the cell cover plate, thereby reducing the space occupied and weight, and increasing the energy density of the cell.

[0052] The first insulating element 31 can be made of PPS (polyphenylene sulfide), with a melting point of approximately 280°C and a resistance range of 2–100,000 Ω or greater than 200 MΩ. The number of first insulating elements 31 corresponds one-to-one with the poles 20.

[0053] In this embodiment, as Figure 6 As shown, at least a portion of the first insulating element 31 covers the circumferential sidewall of the first plate body portion 21 to enhance the insulation protection of the pole post 20.

[0054] In this embodiment, as Figure 7 As shown, the distance between the side wall of the first plate part 21 and the side wall of the column part 22 is L; the distance between the side wall of the column part 22 and the hole wall of the mounting hole 11 is M, L>M, so that the pole post 20 is firmly assembled on the cover plate body 10, avoiding the situation where the pole post 20 falls off under the impact of external force, ensuring the reliable assembly of the pole post 20, thereby improving the safety performance of the cell cover plate.

[0055] In a preferred embodiment, 0.8mm ≤ L ≤ 5mm. This avoids the situation where the resistance value is unstable due to the small contact area between the first plate portion 21 and the first insulating member 31 when L is less than 0.8mm, and also avoids the problem of excessive space occupation when L is greater than 5mm, resulting in large material consumption and high manufacturing costs. Preferably, L = 2.5mm.

[0056] In this embodiment, the first plate portion 21 is made of aluminum.

[0057] Furthermore, in this embodiment, as Figures 1 to 7 As shown, the cell cover also includes a sealing element 40, which is used to ensure the assembly sealing of the electrode post 20 and the cover body 10. The sealing element 40 is formed into a ring structure and is sleeved on the circumferential side wall of the post part 22. The sealing element 40 is provided in a one-to-one correspondence with the electrode post 20. The sealing element 40 can be a sealing ring made of fluororubber with a melting point of about 350°C.

[0058] Specifically, in the thickness direction of the cover plate body 10, the sealing element 40 is sandwiched between the cover plate body 10 and the second plate body 23, and the first insulating element 31 is sandwiched between the first plate body 21 and the cover plate body 10. The pole post 20 presses the first insulating element 31 onto the cover plate body 10, so that the cover plate body 10 can apply a force toward the sealing element 40 toward the second plate body 23, thereby causing the sealing element 40 to generate a compression. If the compression is too small, the sealing performance is poor; if the compression is too large, the sealing element 40 is prone to wear, aging, or even breakage.

[0059] To ensure that the seal 40 maintains its sealing performance and does not age and fail under long-term pressure, in this embodiment, as follows: Figure 7 As shown, the dimension of the seal 40 in the thickness direction of the cover plate body 10 before compression is 'a' (in mm), and the dimension of the seal 40 in the thickness direction of the cover plate body 10 after compression is 'b' (in mm); the compression amount of the seal 40 is... ≤50%.

[0060] In this embodiment, the preferred range of compression amount for the seal 40 is: To ensure the sealing reliability of the seal 40 and avoid aging failure, the air tightness of the seal 40 with different compression amounts is tested below. The test results are shown in Table 1.

[0061] Table 1

[0062]

[0063] As can be seen from Table 1 above, in Examples 1 to 3, the compression amount of the seal 40 is located at... Within the specified range, the air tightness test was qualified. Among them, the sealing element 40 of Example 2 had the best aging resistance and the sealing performance of the sealing element 40 was more reliable. However, in Comparative Example 1, the compression of the sealing element 40 was insufficient, and there was a risk of air leakage in the cell cover. In Comparative Example 2, the compression of the sealing element 40 was too large, and the sealing element 40 was prone to permanent collapse that could not rebound, which would affect the air tightness in the later stage.

[0064] Furthermore, in this embodiment, as Figure 4 andFigure 7 As shown, when hour, when hour, Where S is the contact area between the sealing element 40 and the cover plate body 10, in mm. 2 ;σ b The tensile strength of the material of the first plate portion 21 is expressed in MPa. In this embodiment, the material of the first plate portion 21 is Al 1060, and σ... b Under normal circumstances, the strength is ≥95MPa; A is the perimeter of the connection between the first plate part 21 and the column part 22, in mm; c is the thickness of the first plate part 21 in the thickness direction of the cover plate body 10, in mm. This ensures that the structural strength of the first plate part 21 is greater than the elastic force of the seal 40 after compression, thereby ensuring the reliable installation of the pole post 20 and avoiding the safety risk caused by the pole post 20 falling off the cell cover plate.

[0065] Preferably, 0.5mm≤c≤5mm, thus avoiding the difficulty in forming the electrode post 20 when c<0.5mm, and the high cost of preparing the electrode post 20 when c>5mm.

[0066] In one embodiment, c = 0.95 mm, a = 1.1 mm, and b = 0.7 mm, which represents the compression amount. c=0.95mm facilitates the molding of the pole post 20 and saves materials. The compression amount of 36.36% ensures that the seal 40 maintains its sealing performance under long-term pressure and will not age or fail.

[0067] Furthermore, in this embodiment, S = 70mm 2 A = 62.8 mm, Substituting into the formula, we can obtain the resilience force of seal 40 = 70 × [260 × (1 - 0.7 / 1.1)]. 2 -120(1-0.7 / 1.1)+18]=611.8N, while the structural strength of the first plate part 21 on the pole post 20 is ≥0.6×95×62.8×0.95=3400.62N, thus verifying that the above limiting conditions are met.

[0068] It should be noted that force tests were performed on the five cell cover samples. Specifically, a thrust was applied to the electrode post 20 from top to bottom in a direction perpendicular to the cover body 10 to detect the maximum force on the electrode post 20. The thrust values ​​detected for sample 1 were 3530N, sample 2 were 3451N, sample 3 were 3640N, sample 4 were 3512N, and sample 5 were 3710N. All of these values ​​are basically consistent with the calculated results (3400.62N) mentioned above. This proves that the above-mentioned limiting conditions can ensure that the sealing element 40 can maintain its sealing performance and will not age and fail under long-term pressure.

[0069] In this embodiment, as Figure 2 , Figure 3 and 5 As shown, the cell cover also includes a second insulating member 32. The second insulating member 32 is disposed on the side of the cover body 10 facing the inside of the cell to form an insulating protection for the cover body 10. The material of the second insulating member 32 can be PP (polypropylene) with a melting point of about 160°C. A portion of the first insulating member 31 extends between the cover body 10 and the second plate body 23 to avoid the second plate body 23 from overlapping with the cover body 10.

[0070] Furthermore, in this embodiment, as Figure 6 As shown, the sealing member 40 is sleeved on the circumferential side wall of the column portion 22, and at least part of the first insulating member 31 extends between the side wall of the column portion 22 and the hole wall of the mounting hole 11, so that the first insulating member 31 and the sealing member 40 are pressed together. In this way, the first insulating member 31 and the sealing member 40 together cover the entire circumferential side wall of the column portion 22, thereby ensuring the insulation between the pole post 20 and the cover plate body 10 while effectively improving the assembly sealing of the cell cover plate.

[0071] In this embodiment, as Figures 1 to 5 As shown, multiple pole posts 20 are provided, including positive pole posts 20 and negative pole posts 20. When the cover plate body 10 is a rectangular plate, the multiple pole posts 20 can be arranged at intervals along the length direction of the cover plate body 10.

[0072] In a first optional embodiment, the positive electrode post 20 is made of aluminum, preferably Al 1060, and the negative electrode post 20 is made of copper-aluminum composite material, preferably Cu T2+Al 1060. In a second optional embodiment, both the positive electrode post 20 and the negative electrode post 20 are made of aluminum, preferably Al 1060.

[0073] Furthermore, in this embodiment, such as Figure 2As shown, the cover plate body 10 is provided with an injection hole 12 and an exhaust hole. Both the injection hole 12 and the exhaust hole are formed as through holes that penetrate the cover plate body 10. After the cover plate body 10 is assembled with the housing, electrolyte can be injected into the cell through the injection hole 12. After the injection is completed, the injection hole 12 is sealed by a sealing plug and other components.

[0074] In this embodiment, as Figure 1 and Figure 2 As shown, the cell cover also includes a pressure relief component 50, which is located at the vent. When the cell generates gas, causing its internal pressure to reach a preset opening pressure, the pressure relief component 50 opens, allowing the gas inside the cell to be discharged through the vent, thus providing timely pressure relief and ensuring the safety of the cell. The pressure relief component 50 can be an explosion-proof valve.

[0075] According to the present invention, a battery cell cover plate eliminates the riveting block structure in traditional battery cell cover plates, allowing the first plate portion on the electrode post to directly press the first insulating member onto the cover plate body. This eliminates the welding process between the riveting block and the electrode post, avoiding increased internal resistance due to welding resistance, facilitating assembly, and reducing costs. It also reduces the overall thickness of the battery cell cover plate, thereby reducing space and weight, and increasing the energy density of the battery cell. Furthermore, by limiting the distance L between the sidewall of the first plate portion and the sidewall of the post portion to be greater than the distance M between the sidewall of the post portion and the wall of the mounting hole, the electrode post is securely mounted on the cover plate body, preventing it from detaching under external impact and ensuring reliable assembly. In addition, by limiting the relationship between the rebound force of the seal within the compression range and the structural strength of the first plate portion of the electrode post under different compression amounts, reliable electrode post installation is ensured, further reducing the risk of the electrode post detaching from the battery cell cover plate, thereby improving the safety performance of the battery cell cover plate.

[0076] According to the present invention, a battery cell includes a battery cell cover plate as described above, with the terminals firmly mounted on the cover plate body to prevent the terminals from falling off the battery cell cover plate, thereby reducing the risk of short circuits and failures of the battery cell and giving the battery cell good service life and safety performance.

[0077] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this 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 can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cell cover plate, characterized in that, The cell cover plate includes: The cover plate body has mounting holes; A terminal post is disposed in the mounting hole. The terminal post includes a post body, a first plate body, and a second plate body. The first plate body is disposed at the end of the terminal post facing the outside of the battery cell and protrudes outward from the side wall of the post body. The second plate body is disposed at the end of the terminal post facing the inside of the battery cell and protrudes outward from the side wall of the post body. The distance between the side wall of the first plate body and the side wall of the post body is L. The distance between the side wall of the post body and the wall of the mounting hole is M, where L > M and 0.8 mm ≤ L ≤ 5 mm. The first insulating element is sandwiched between the first plate body and the cover plate body; A sealing element, sandwiched between the cover plate body and the second plate portion, has a dimension 'a' (in mm) in the thickness direction of the cover plate body before compression, and a dimension 'b' (in mm) in the thickness direction of the cover plate body after compression; the compression amount of the sealing element is... 10%≤( ≤50%; When 10%≤( When <25%, When 25% ≤ ( When ≤50%, ; Wherein, S is the contact area between the sealing element and the cover plate body, in mm. 2 ; A is the tensile strength of the material of the first plate body, in MPa; A is the perimeter of the connection between the first plate body and the column body, in mm; c is the thickness of the first plate body in the thickness direction of the cover plate body, in mm, 0.5mm≤c≤5mm.

2. The cell cover plate according to claim 1, characterized in that, The first plate portion and / or the second plate portion are expanded by stamping to make them protrude outward relative to the side wall of the column portion; Alternatively, the first plate portion and / or the second plate portion may be formed as a separate structure with the column portion.

3. The cell cover plate according to claim 1, characterized in that, At least a portion of the first insulating element covers the circumferential sidewall of the first plate body.

4. The cell cover plate according to claim 1, characterized in that, The cell cover plate also includes: A second insulating element is disposed on the side of the cover plate body facing the inside of the cell; a portion of the first insulating element extends between the cover plate body and the second plate body portion.

5. The cell cover plate according to claim 1, characterized in that, The sealing element is sleeved on the circumferential side wall of the column portion, and at least a portion of the first insulating element extends between the side wall of the column portion and the wall of the mounting hole, such that the first insulating element is pressed against the sealing element.

6. The cell cover plate according to claim 1, characterized in that, The electrode post is provided in multiple ways, including positive electrode post and negative electrode post.

7. The cell cover plate according to claim 1, characterized in that, The cover plate body is provided with an injection hole and an exhaust hole; The cell cover plate also includes: A pressure relief component is provided at the vent.

8. A battery cell, characterized in that, Includes the cell cover plate as described in any one of claims 1 to 7.

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