Battery cell cover plate and battery cell

Abstract

The invention 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 column is arranged in the mounting hole, the pole column comprises a column body part and a first plate body part, the first plate body part is arranged at one end, facing the outside of the battery cell, of the pole column and is formed by outwards protruding the side wall of the column body part, and the distance between the side wall of the first plate body part and the side wall of the column body part is L; the distance between the side wall of the cylinder part and the hole wall of the mounting hole is M, and L is greater than M; and the first insulating part is clamped between the first plate body part and the cover plate main body. According to the invention, a riveting block structure in a traditional battery cell cover plate is canceled, so that the first plate body part on the pole directly crimps the first insulating part on the cover plate main body, thereby facilitating assembly and reducing cost; the occupied space and the weight of the cover plate are reduced, and the energy density of the battery cell is improved. In addition, L is limited to be larger than M, the situation that the pole falls off under the impact of external force is avoided, and therefore the safety performance of the battery cell cover plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. The structural parts of lithium-ion batteries are also an important part of lithium-ion power batteries. They not only provide protection for lithium-ion batteries in terms of safety and reliability, but also take into account the connection between the internal chemical system of lithium-ion batteries and external modules.

[0003] The existing battery cell cover adopts a structure in which the pole and the rivet block are riveted together. The pole and the rivet block are pre-riveted and then connected by laser welding to realize the assembly of the pole. The process is complicated and the process cost is high. Since the rivet block and the pole are not an integral whole, there is welding resistance, which will cause the internal resistance of the battery to be too large. The riveting of the pole and the rivet block requires the rivet block to have a large thickness, which makes the overall thickness of the battery cell cover too high and occupies a large space, thereby affecting the energy density of the battery cell and increasing the weight and production cost of the battery cell cover. In addition, the connecting part of the rivet block and the pole of the riveted structure is located outside the cover. The battery cell is often subjected to extrusion force in the module or the whole package, that is, the force from the outside to the inside perpendicular to the cover, which causes the riveted structure to have the risk of the pole falling off the rivet block, causing short circuit overlap, and in severe cases, leading to the risk of failure of the whole package, fire and explosion, etc. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery cell cover and a battery cell to solve the problem of the installation structure of the pole and the rivet block on the existing battery cell cover, which has the advantages of high cost, complex processing, increased internal resistance of the battery cell, affected energy density of the battery cell, and easy detachment of the pole from the rivet block when subjected to external extrusion force, thereby causing short circuit overlap.

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

[0006] The cover plate body is provided with a mounting hole;

[0007] A pole, arranged in the mounting hole, the pole comprising a column portion, a first plate portion and a second plate portion, the first plate portion being arranged at one end of the pole facing the outside of the battery cell and formed by the side wall of the column portion protruding outward, the second plate portion being arranged at one end of the pole facing the inside of the battery cell and formed by the side wall of the column portion protruding outward; the distance between the side wall of the first plate portion and the side wall of the column portion is L; the distance between the side wall of the column portion and the hole wall of the mounting hole is M, L>M;

[0008] A first insulating member, sandwiched between the first plate body and the cover plate body;

[0009] The sealing member is sandwiched between the cover plate body and the second plate body. The dimension of the sealing member before compression in the thickness direction of the cover plate body is a, in mm. The dimension of the sealing member after compression in the thickness direction of the cover plate body is b, in mm. The compression amount of the sealing member is

[0010] when hour, when hour,

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

[0012] Preferably, the first plate body portion and / or the second plate body portion are expanded by stamping so as to protrude outward relative to the side wall of the column body portion;

[0013] Alternatively, the first plate portion and / or the second plate portion and the column portion form a split structure.

[0014] Preferably, 0.8 mm ≤ L ≤ 5 mm.

[0015] Preferably, 0.5 mm ≤ c ≤ 5 mm.

[0016] Preferably, at least a portion of the first insulating member covers the circumferential side wall of the first plate portion.

[0017] Preferably, the cell cover plate further includes:

[0018] The second insulating member is arranged on a side of the cover plate body facing the inside of the battery core; a portion of the first insulating member extends between the cover plate body and the second plate body.

[0019] Preferably, the sealing member is sleeved on the circumferential side wall of the column portion, and at least a portion of the first insulating member extends between the side wall of the column portion and the hole wall of the mounting hole, so that the first insulating member is crimped with the sealing member.

[0020] Preferably, a plurality of poles are provided, and the plurality of poles include a positive pole and a negative pole.

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

[0022] The battery cover plate also includes:

[0023] A pressure relief component is arranged at the exhaust hole.

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

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The cell cover of the present invention cancels the riveting block structure in the traditional cell cover, so that the first plate body on the pole directly presses the first insulating member to the cover body, thereby eliminating the welding process between the riveting block and the pole, avoiding the situation where the welding resistance increases the internal resistance of the cell, facilitating assembly and reducing costs; it also reduces the overall thickness of the cell cover, thereby reducing the occupied space and weight, and improving the energy density of the cell. Furthermore, by limiting the distance L between the side wall of the first plate body and the side wall of the column body to be greater than the distance M between the side wall of the column body and the hole wall of the mounting hole, the pole is firmly assembled on the cover body, avoiding the situation where the pole falls off under the impact of external force; 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 body of the pole under different compression amounts of the seal, the pole is ensured to be reliably installed, and the risk of the pole falling off from the cell cover is further reduced, thereby improving the safety performance of the cell cover, so that the battery has a good service life and safety performance.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0030] Figure 2 A schematic diagram of the exploded structure of a cell cover provided by an embodiment of the present invention;

[0031] Figure 3A schematic structural diagram of a cell cover provided by an embodiment of the present invention from another perspective;

[0032] Figure 4 A schematic structural diagram of the contact area between the sealing member and the cover plate body in the battery cover plate provided by an embodiment of the present invention;

[0033] Figure 5 A cross-sectional view of the structure of a cell cover provided by an embodiment of the present invention;

[0034] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0035] Figure 7 A schematic diagram of the dimensional relationship between the pole, the seal and the cover body in the battery cover provided by an embodiment of the present invention.

[0036] Icons: 10 - cover body; 11 - mounting hole; 12 - liquid injection hole; 20 - pole; 21 - first plate body; 22 - column body; 23 - second plate body; 31 - first insulating member; 32 - second insulating member; 40 - sealing member; 50 - pressure relief member. DETAILED DESCRIPTION

[0037] The following specific embodiments are provided to help the reader obtain 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 an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve 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 interpreted as being limited to the examples described herein. Rather, the examples described herein have been 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, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

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

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

[0042] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be located "below" or "lower" relative to the 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 relational terms used herein will be interpreted accordingly.

[0043] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0044] Variations in the shapes shown in the 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 drawings but include variations in shapes 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 invention, a cell cover is provided, which specifically includes a cover body 10 , a pole 20 and a first insulating member 31 .

[0047] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0048] In this embodiment, if Figures 1 to 5 As shown, the cover body 10 is formed into a plate-like structure. Specifically, the cover body 10 can be a rectangular or circular plate-like structure. A mounting hole 11 is opened on the cover body 10. The mounting hole 11 is formed into a through hole structure that penetrates the cover body 10.

[0049] The pole 20 is arranged in the mounting hole 11, so that the position of the pole 20 relative to the cover body 10 is fixed. Specifically, the pole 20 includes a first plate body 21, a column body 22, and a second plate body 23 arranged in sequence along its axial direction, wherein the first plate body 21 is arranged at one end of the pole 20 facing the outside of the battery cell, and the second plate body 23 is arranged at one end of the pole 20 facing the inside of the battery cell, and the first plate body 21 and the second plate body 23 are both formed by the side wall of the column body 22 protruding outward, so that the axial cross section of the pole 20 is formed into a structure similar to the "I" shape.

[0050] The cross-section of the first plate body 21, the column body 22 and / or the second plate body 23 perpendicular to the axial direction of the pole 20 may be circular, polygonal or elliptical. In the present embodiment, the first plate body 21 and / or the second plate body 23 may protrude relative to the column body 22 by a stamping process after passing through the mounting hole 11 to achieve outward expansion relative to the side wall of the column body 22, or the first plate body 21 and / or the second plate body 23 and the column body 22 may be formed into a split structure, and the first plate body 21 and / or the second plate body 23 may be assembled to the end of the column body 22 after the column body 22 passes through the mounting hole 11, so that the first plate body 21 and the second plate body 23 are respectively located at the two ends of the column body 22 in the axial direction.

[0051] The first insulating member 31 is sandwiched between the first plate portion 21 and the cover body 10, thereby eliminating the riveted block structure in the traditional battery cover, so that the first plate portion 21 on the pole 20 directly presses the first insulating member 31 to the cover body 10, thereby eliminating the welding process between the riveted block and the pole 20, avoiding the situation where the welding resistance increases the internal resistance of the battery cell, facilitating assembly and reducing costs; it also reduces the overall thickness of the battery cover, thereby reducing the occupied space and weight, and improving the energy density of the battery cell.

[0052] The material of the first insulating member 31 can be PPS (polyphenylene sulfide), which has a melting point of about 280° C. and a resistance range of 2 to 100,000Ω or greater than 200MΩ. The number of the first insulating members 31 is set in one-to-one correspondence with the poles 20 .

[0053] In this embodiment, if Figure 6 As shown, at least a portion of the first insulating member 31 covers the circumferential side wall of the first plate portion 21 to enhance the insulation protection effect on the pole 20 .

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

[0055] In a preferred embodiment, 0.8 mm ≤ L ≤ 5 mm, so as to avoid the situation that when L is less than 0.8 mm, the resistance value is unstable due to the small contact area between the first plate portion 21 and the first insulating member 31, and also avoid the problem that when L is greater than 5 mm, the space occupied is too large, resulting in large material consumption and high manufacturing cost. Preferably, L = 2.5 mm.

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

[0057] Furthermore, in this embodiment, if Figures 1 to 7 As shown, the cell cover also includes a seal 40 for ensuring the assembly sealing of the pole 20 and the cover body 10. The seal 40 is formed into an annular structure to be sleeved on the circumferential side wall of the column portion 22. The seal 40 is arranged one-to-one with the pole 20. The seal 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 body 10, the seal 40 is sandwiched between the cover body 10 and the second plate body 23, the first insulating member 31 is sandwiched between the first plate body 21 and the cover body 10, and the pole 20 crimps the first insulating member 31 onto the cover body 10, so that the cover body 10 can apply a force toward the second plate body 23 to the seal 40, thereby causing the seal 40 to be compressed. If the compression is too small, the sealing is poor, and if the compression is too large, the seal 40 is prone to wear, aging, or even breakage.

[0059] In order to ensure that the sealing member 40 still maintains sealing performance under long-term pressure and does not age and fail, in this embodiment, Figure 7 As shown, the dimension of the sealing member 40 before compression in the thickness direction of the cover plate body 10 is a, in mm, and the dimension of the sealing member 40 after compression in the thickness direction of the cover plate body 10 is b, in mm; the compression amount of the sealing member 40 is ≤50%.

[0060] In this embodiment, the preferred range of the compression amount of the seal 40 is In this way, the sealing reliability of the sealing member 40 is ensured and aging failure is avoided. The airtightness test of the sealing member 40 with different compression amounts is carried out below. The test results are shown in Table 1.

[0061] Table 1

[0062]

[0063] It can be seen from Table 1 above that in Examples 1 to 3, the compression amount of the seal 40 is Within the limited range, the airtightness test is qualified, among which the seal 40 of Example 2 has the best aging resistance and the sealing performance of the seal 40 is more reliable; while in Comparative Example 1, the compression amount of the seal 40 is insufficient, and there is a risk of air leakage in the battery cover; in Comparative Example 2, the compression amount of the seal 40 is too large, and the seal 40 is prone to permanent collapse that cannot rebound, affecting the later airtightness.

[0064] Furthermore, in this embodiment, if Figure 4 and Figure 7 As shown, when hour, when hour, Wherein, S is the contact area between the seal 40 and the cover body 10, in mm 2 ; σ b is the tensile strength of the material of the first plate body 21, in MPa. In this embodiment, the material of the first plate body 21 is Al 1060, σ b In general, it is ≥95MPa; A is the circumference of the connection between the first plate body 21 and the column body 22, in mm; c is the thickness dimension of the first plate body 21 in the thickness direction of the cover body 10, in mm, so as to ensure that the structural strength of the first plate body 21 is greater than the resilience of the seal 40 after compression, thereby ensuring that the pole 20 is installed reliably and avoiding the safety risk caused by the pole 20 falling off the battery cover.

[0065] Preferably, 0.5 mm ≤ c ≤ 5 mm, so as to avoid the difficulty in forming the pole 20 when c < 0.5 mm, and when c > 5 mm, more materials are used to prepare the pole 20, which is costly.

[0066] In one embodiment, c = 0.95 mm, a = 1.1 mm, b = 0.7 mm, that is, the compression amount c=0.95 mm facilitates the molding of the pole 20 and saves materials, and the compression amount=36.36% can ensure that the sealing member 40 still maintains sealing performance under long-term pressure and does not age and fail.

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

[0068] It should be noted that force tests were carried out on the five battery cover samples, specifically, a thrust was applied to the pole 20 from top to bottom in a direction perpendicular to the cover body 10, so as to detect the maximum force of the pole 20, among which the thrust value detected by sample 1 was 3530N, the thrust value detected by sample 2 was 3451N, the thrust value detected by sample 3 was 3640N, the thrust value detected by sample 4 was 3512N, and the thrust value detected by sample 5 was 3710N, which were basically consistent with the calculation results (3400.62N) as mentioned above, thereby proving that the above-mentioned limiting conditions can ensure that the seal 40 still maintains sealing performance under long-term pressure and will not age and fail.

[0069] In this embodiment, if Figure 2 , Figure 3 and 5 As shown, the battery cover also includes a second insulating member 32, which is arranged on the side of the cover body 10 facing the inside of the battery 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; part of the first insulating member 31 extends between the cover body 10 and the second plate body 23 to avoid overlapping between the second plate body 23 and the cover body 10.

[0070] Furthermore, in this embodiment, if 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 is crimped with the sealing member 40, so that the first insulating member 31 and the sealing member 40 are jointly covered on the entire circumferential side wall of the column portion 22, thereby ensuring the insulation between the pole 20 and the cover plate body 10 while effectively improving the assembly sealing of the battery cell cover plate.

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

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

[0073] In addition, in this embodiment, if Figure 2As shown, the cover body 10 is provided with an injection hole 12 and an exhaust hole, and both the injection hole 12 and the exhaust hole are formed as a through-hole structure penetrating the cover body 10; after the cover body 10 is assembled with the shell, electrolyte can be injected into the battery cell through the injection hole 12, and after the injection is completed, the injection hole 12 is blocked by a sealing plug and other components.

[0074] In this embodiment, if Figure 1 and Figure 2 As shown, the cell cover also includes a pressure relief member 50, which is arranged at the exhaust hole. When the cell produces gas and its internal pressure reaches a preset opening pressure, the pressure relief member 50 opens so that the gas inside the cell can be discharged through the exhaust hole, thereby playing a role of timely pressure relief to ensure the safety of the cell. The pressure relief member 50 can be an explosion-proof valve.

[0075] According to a cell cover provided by the present invention, the rivet block structure in the traditional cell cover is eliminated, so that the first plate body on the pole directly presses the first insulating member to the cover body, thereby eliminating the welding process between the rivet block and the pole, avoiding the situation where the welding resistance increases the internal resistance of the cell, facilitating assembly and reducing costs; the overall thickness of the cell cover is reduced, thereby reducing the occupied space and weight, and improving the energy density of the cell. Furthermore, by limiting the distance between the side wall of the first plate body and the side wall of the column body to L greater than the distance between the side wall of the column body and the hole wall of the mounting hole to M, the pole is firmly assembled on the cover body, avoiding the pole falling off under the impact of external force, and ensuring the reliable assembly of the pole. 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 body of the pole under different compression amounts of the seal, the pole is ensured to be reliably installed, further reducing the risk of the pole falling off from the cell cover, thereby improving the safety performance of the cell cover.

[0076] A battery cell provided according to the present invention includes the battery cell cover as described above, and the pole is firmly mounted on the cover body to prevent the pole from falling off the battery cell cover, thereby reducing the risks of short circuit and failure of the battery cell, and ensuring that the battery cell has a good service life and safety performance.

[0077] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; 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 be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: The cover plate body is provided with a mounting hole; A pole, arranged in the mounting hole, the pole comprising a column portion, a first plate portion and a second plate portion, the first plate portion being arranged at one end of the pole facing the outside of the battery cell and formed by the side wall of the column portion protruding outward, the second plate portion being arranged at one end of the pole facing the inside of the battery cell and formed by the side wall of the column portion protruding outward; the distance between the side wall of the first plate portion and the side wall of the column portion is L; the distance between the side wall of the column portion and the hole wall of the mounting hole is M, L>M; A first insulating member, sandwiched between the first plate body and the cover plate body; The sealing member is sandwiched between the cover plate body and the second plate body. The dimension of the sealing member before compression in the thickness direction of the cover plate body is a, in mm. The dimension of the sealing member after compression in the thickness direction of the cover plate body is b, in mm. The compression amount of the sealing member is when hour, when ≤50%, Wherein, S is the contact area between the seal and the cover body, in mm 2 ; σ b is the tensile strength of the material of the first plate body, in MPa; A is the circumference of the connection between the first plate body and the column body, in mm; c is the thickness dimension of the first plate body in the thickness direction of the cover plate body, in mm.

2. The cell cover plate according to claim 1, characterized in that: The first plate body portion and / or the second plate body portion are expanded by stamping so as to protrude outward relative to the side wall of the column body portion; Alternatively, the first plate portion and / or the second plate portion and the column portion form a split structure.

3. The cell cover plate according to claim 1, characterized in that: 0.8mm≤L≤5mm.

4. The cell cover plate according to claim 1, characterized in that: 0.5mm≤c≤5mm.

5. The cell cover plate according to claim 1, characterized in that: At least a portion of the first insulating member covers the circumferential side wall of the first plate portion.

6. The cell cover plate according to claim 1, characterized in that: The battery cover plate also includes: The second insulating member is arranged on a side of the cover plate body facing the inside of the battery core; a portion of the first insulating member extends between the cover plate body and the second plate body.

7. The cell cover plate according to claim 1, characterized in that: The sealing member is sleeved on the circumferential side wall of the column portion, and at least part of the first insulating member extends between the side wall of the column portion and the hole wall of the mounting hole, so that the first insulating member is crimped with the sealing member.

8. The cell cover plate according to claim 1, characterized in that: There are multiple poles, and the multiple poles include positive poles and negative poles.

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

10. A battery cell, characterized in that: The invention comprises a cell cover plate as described in any one of claims 1 to 9.

Images