Battery cover and battery

Abstract

The present invention relates to the field of battery technology, and in particular to a battery cell cover and a battery cell. The battery cell cover comprises: a mounting hole on the cover body in which the pole is assembled; a riveted weld part is provided with a connection hole, the pole extends into the connection hole, and is first riveted and then welded with the riveted weld part; a riveted area and a welding reserved area arranged along a first direction are formed on the riveted weld part, and the connection hole is arranged in the riveted area; before riveting, W1=W‑1 / [(4~12)×A]; W is the size of the welding reserved area in the second direction; W1 is the size of the riveted area in the second direction; A is the minimum distance between the connection hole and the edge of the riveted weld part in the second direction. The present invention uses the limiting condition of W1=W‑1 / [(4~12)×A] to ensure that the shape accuracy and dimensional accuracy of the riveted weld part after riveting meet the appearance requirements, lay a good foundation for subsequent welding, and effectively improve the yield rate of the assembled battery cell cover, thereby ensuring the product quality of the battery cell.

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 electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. The lithium battery cover is a key accessory in lithium-ion batteries. It has the functions of welding with the shell to form a sealed cavity, leading the positive and negative electrodes of the electrode group, and serving as an assembly carrier. The traditional cover includes a riveting block and a pole. The pole is riveted with the riveting block to fix the entire cover. It is most widely used in the battery field because of its high connection strength, good stability, and good sealing performance. The pole is subjected to a large force to expand and deform in order to achieve riveting. At this time, the riveting block will also partially expand and deform due to the riveting pressure, affecting the subsequent welding and the appearance quality of the cover, thereby reducing the yield rate of the battery cell. Summary of the invention

[0003] 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 that the riveting of the pole and the rivet block in the existing battery cell cover will affect the shape accuracy of the rivet block and the subsequent welding quality, thereby affecting the appearance of the battery cell cover and reducing the yield rate of the battery cell.

[0004] A first aspect of the present invention provides a cell cover, wherein the cell cover comprises:

[0005] The cover plate body is provided with a mounting hole;

[0006] A pole, mounted in the mounting hole, with a portion of the pole extending out of the cover plate body;

[0007] A riveted welding part is provided with a connection hole, the pole extends into the connection hole, and is first riveted and then welded with the riveted welding part; a riveted area and a welding reserved area arranged along a first direction are formed on the riveted welding part, the connection hole is arranged at the middle position of the riveted area in the first direction, the size of the riveted area in the first direction is L, the size of the connection hole in the first direction is D0, and the minimum distance between the edge of the connection hole and the edge of the riveted area in the first direction is L1, 1≤L / D0≤1.5, and / or 1mm≤L1≤5.5mm;

[0008] Before riveting, W1=W-1 / [(4~12)×A];

[0009] Among them, W is the size of the welding reserved area in the second direction, in mm; W1 is the size of the riveting area in the second direction, in mm; A is the minimum distance between the connecting hole and the edge of the riveted part in the second direction, in mm.

[0010] Preferably, 1mm≤A≤15mm.

[0011] Preferably, (D+2A-0.1) mm≤W≤(D+2A+0.1) mm, wherein D is the size of the connecting hole in the second direction.

[0012] Preferably, D≥1 mm.

[0013] Preferably, along the first direction, welding reserved areas are provided on both sides of the riveting area.

[0014] Preferably, there is a gap between the riveting area and the welding reserved area in the first direction;

[0015] Alternatively, the remaining portion of the riveted component except the riveted area is formed as the welding reserved area.

[0016] Preferably, a size of the connecting hole in the first direction is smaller than a size of the riveting area in the first direction.

[0017] Preferably, after riveting, the pole includes a swelling portion, a first column portion, a second column portion and a connecting portion arranged in sequence along the axial direction; the connecting hole is formed as a stepped hole, the swelling portion and the first column portion are arranged in the connecting hole, a portion of the second column portion is arranged in the mounting hole, and the connecting portion is arranged on the side of the cover plate body facing the interior of the battery cell.

[0018] Preferably, it also includes:

[0019] A first insulating member, sandwiched between the riveted member and the cover plate body;

[0020] The second insulating member is arranged on a side of the cover body facing the inside of the battery cell, and a portion of the second insulating member is sandwiched between the pole and the cover body.

[0021] 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.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the battery cell cover plate of the present invention, the pole and the riveted weld part are first riveted and then welded, a riveted area and a welding reserved area are divided on the riveted weld part, and a connecting hole is arranged in the riveted area. By limiting the relationship between the riveted area before riveting, the welding reserved area, and the distance between the connecting hole and the edge of the riveted weld part to satisfy W1=W-1 / [(4~12)×A], the shape accuracy and dimensional accuracy of the riveted weld part after riveting meet the appearance requirements, laying a good foundation for subsequent welding, and effectively improving the yield rate of the assembled battery cell cover plate, thereby ensuring the product quality of the battery cell.

[0024] 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

[0025] 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.

[0026] Figure 1 A schematic diagram of the exploded structure of a cell cover provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a cell cover plate provided in an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a cell cover provided by an embodiment of the present invention from another perspective;

[0029] Figure 4 A schematic diagram of the structure of dividing the welding reserved area and the riveted area on the riveted weldment in the battery cell cover provided by an embodiment of the present invention.

[0030] Icons: 10-cover body; 11-mounting hole; 20-pole; 21-inflating part; 22-first column part; 23-second column part; 24-connecting part; 30-rivet welding part; 31-connecting hole; 301-welding reserved area; 302-riveted area; 41-first insulating part; 42-second insulating part; 50-sealing part; 60-pressure relief assembly; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] 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.

[0036] 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 "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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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 riveted component 30 .

[0041] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0042] In this embodiment, if Figure 1 As shown, the cover body 10 is formed as a plate-like structure. Specifically, the cover body 10 can be a plate-like structure in a rectangular or circular shape. A mounting hole 11 is opened on the cover body 10, and the pole 20 is assembled in the mounting hole 11. The mounting hole 11 is formed as a through hole structure that penetrates the cover body 10 in the thickness direction. The mounting hole 11 can be a polygonal hole, a circular hole, a waist-shaped hole, etc.

[0043] In this embodiment, part of the pole 20 extends out of the cover body 10. Specifically, both ends of the pole 20 in the axial direction extend out of the cover body 10, so that the end of the pole 20 facing the interior of the battery cell can be connected to the pole group arranged inside the battery cell, and the end of the pole 20 facing the outside of the battery cell is connected to the bus, so that multiple battery cells are connected in series and / or in parallel to form a battery module or battery pack.

[0044] In this embodiment, if Figures 1 to 4 As shown, the rivet weld 30 is formed as a block structure, and a connection hole 31 is opened on the rivet weld 30. The connection hole 31 is a through-hole structure that penetrates the rivet weld 30. The rivet weld 30 is arranged on the side of the cover body 10 facing the outside of the battery cell. The part of the pole 20 extending out of the mounting hole 11 extends into the connection hole 31, and is first riveted and then welded to the rivet weld 30 to fix the battery cell cover.

[0045] Specifically, Figure 1 As shown, after riveting, the pole 20 includes a swelling portion 21, a first column portion 22, a second column portion 23 and a connecting portion 24 arranged in sequence along the axial direction, the swelling portion 21 is arranged on the side of the pole 20 facing the outside of the battery cell, the connecting portion 24 is arranged on the side of the pole 20 facing the inside of the battery cell, the connecting hole 31 is formed as a stepped hole, and the swelling portion 21 is formed by swelling the material radially outward by the riveting process, so that the radial size of the swelling portion 21 is greater than the radial size of the first column portion 22, and the swelling portion 21 and the first column portion The first column 22 is arranged in the connection hole 31, so that the pole 20 and the riveted welding part 30 are riveted together; part of the second column 23 is arranged in the mounting hole 11 and part of the second column 23 extends out of the mounting hole 11, and the radial dimension of the second column 23 is greater than the radial dimension of the first column 22, so that the riveted welding part 30 is limited on the side facing the cover body 10; the expansion part 21, the first column 22 and / or the second column 23 can realize a cylindrical or polygonal prism structure. The connecting part 24 is arranged on the side of the cover body 10 facing the inside of the battery cell, and the connecting part 24 is preferably formed into a plate-like structure arranged parallel to the cover body 10, such as a polygonal, circular or elliptical plate-like structure, so as to facilitate connection with the pole ear on the pole group.

[0046] It should be noted that, in this embodiment, the radial direction only refers to the direction perpendicular to the axial direction, which does not mean that the pole 20 must be a cylindrical structure.

[0047] In this embodiment, if Figure 4As shown, a riveted area 302 and a welding reserved area 301 arranged along a first direction D1 are formed on the riveted weld part 30, and a connecting hole 31 is arranged at a middle position of the riveted area 302 in the first direction D1. The size of the riveted area 302 in the first direction D1 is L, in mm; the size of the connecting hole 31 in the first direction D1 is D0, in mm; the minimum distance between the edge of the connecting hole 31 and the edge of the riveted area 302 in the first direction D1 is L1, in mm; 1≤L / D0≤1.5, and / or 1mm≤L1≤5.5mm, so that the position of the riveted area 302 on the riveted weld part 30 is clearly defined.

[0048] Before riveting, W1=W-1 / [(4~12)×A]; wherein W is the size of the welding reserved area 301 in the second direction D2, in mm; W1 is the size of the riveting area 302 in the second direction D2, in mm; A is the minimum distance between the connecting hole 31 and the edge of the riveted part 30 in the second direction D2, in mm. By limiting the relationship between W1, W and A, a certain deformation margin is reserved in the riveted area 302 to avoid excessive deformation of the riveted part 30 after riveting, so that the shape accuracy and dimensional accuracy of the riveted part 30 after riveting meet the appearance requirements, laying a good foundation for subsequent welding, and effectively improving the yield rate of the assembled battery cover, thereby ensuring the product quality of the battery.

[0049] It should be noted that Figure 4 The area surrounded by the dashed line frame is the welding reserved area 301, and the area surrounded by the dotted line frame is the riveting area 302. It should be further explained that the first direction D1 is perpendicular to the second direction D2. In this embodiment, the riveted weld 30 can be formed into a rectangular block structure. The first direction D1 is the length direction of the riveted weld 30, that is, the length direction of the rectangular cover plate body 10, and the second direction D2 is the width direction of the riveted weld 30, that is, the width direction of the rectangular cover plate body 10.

[0050] In this embodiment, if Figure 4As shown, along the first direction D1, welding reserved areas 301 are provided on both sides of the riveted area 302. In order to verify the reliability of the limiting condition W1=W-1 / [(4~12)×A], the riveted area 302 and the welding reserved areas 301 on the left and right sides of the riveted area 302 of multiple groups of battery cover plates are measured before and after riveting, wherein A=2.5mm, and the design size W of the selected riveted welded parts before riveting is 14.2mm. It should be noted that due to the influence of errors such as manufacturing and measurement, the actual measured W size has a certain deviation from 14.2mm. W1=W-1 / [(4~12)×A] is calculated to be 14.1mm~14.167mm. Therefore, in this embodiment, if the shape accuracy and size accuracy of the riveted welded part 30 after riveting meet the appearance requirements, the size of W1 before riveting needs to be in the range of 14.1mm~14.167mm. The test results are shown in the table below.

[0051]

[0052] Note: "W (left)" in the table means Figure 4 The size of the welding reserved area 301 located on the left side of the riveting area 302 in the second direction D2 from the perspective, "W (right)" represents the size of the welding reserved area 301 located on the left side of the riveting area 302 in the second direction D2. Figure 4 The size of the welding reserved area 301 located on the right side of the riveting area 302 in the second direction D2 under the viewing angle, that is, the size of the welding reserved areas 301 on both sides in the second direction D2, needs to be measured.

[0053] It can be seen from the parameters in the above table that in Examples 1 to 5, the size of W1 before riveting is in the range of 14.1 mm to 14.167 mm. The riveted weld 30 expands after the pole 20 is riveted, so that the size of W1 becomes larger, and the W values ​​on both sides tend to be consistent. After the pole 20 and the riveted weld 30 are riveted, the size difference between W and W1 on the riveted weld 30 is within the range of ±0.02 mm. Therefore, it is proved that the width size consistency of the riveted weld 30 in the first direction D1 after riveting is good.

[0054] As for Comparative Examples 1 to 5 in the table, the size of W1 on the riveted part is not within the calculated range of 14.1mm~14.167mm before the pole is riveted. Although the sizes of W on the left and right sides of W1 are almost the same, after riveting, the size of W1 becomes larger due to the expansion of the pole. After riveting, the size difference between W and W1 on the riveted part 30 exceeds the range of ±0.02mm, so that the shape accuracy and size accuracy of the riveted part 30 after riveting cannot meet the appearance requirements of the battery cover.

[0055] In a preferred embodiment, Figure 3As shown, 1mm≤A≤15mm, so as to avoid that A is too large to affect the current carrying capacity of the pole 20, or that A is too small to reduce the connection strength between the riveted weld 30 and the pole 20.

[0056] Furthermore, in this implementation, if Figure 3 and Figure 4 As shown, (D+2A-0.1)mm≤W≤(D+2A+0.1)mm, where D is the size of the connecting hole 31 in the second direction D2, so that a certain processing allowance is reserved, the error is reduced, and the reliability of the limiting condition of W1=W-1 / [(4~12)×A] in improving the yield rate of the battery cover is improved. In this embodiment, when the connecting hole 31 is a circular hole, D is the diameter of the connecting hole 31, and when the connecting hole 31 is circular, D0=D. It should be noted that D0 and D as mentioned above are the dimensions of the area of ​​the connecting hole 31 that accommodates the swelling portion 21 as described above.

[0057] In a preferred embodiment, D≥1 mm, so that the expansion requirement of the pole 20 is met, ensuring that the pole 20 has sufficient current flow capacity and is reliably connected to the riveted weld 30, and meeting the force requirement of the pole 20.

[0058] In this embodiment, if Figure 4 As shown, the connection hole 31 is disposed in the middle of the riveted component 30. Along the first direction D1, welding reserved areas 301 are disposed on both sides of the riveted area 302, so that the influence of riveting and / or welding on the shape accuracy and size accuracy of the riveted component 30 is minimized.

[0059] In addition, in this embodiment, Figure 4 As shown, the remaining parts of the riveted weld part 30 except the riveted area 302 are formed as welding reserved areas 301, so that the parts of the riveted weld part 30 that are easily affected by riveting deformation are divided into the riveted area 302, and the parts that are not affected or less affected by riveting are divided into welding reserved areas 301.

[0060] In another embodiment, the riveted area 302 and the welding reserved area 301 are spaced apart in the first direction D1, so that there is a gap between the riveted area 302 and the welding reserved area 301. In this way, when measuring the riveted weld 30, the measuring position of the riveted area 302 and the measuring position of the welding reserved area 301 are separated by a large distance, thereby ensuring the accuracy of the measurement. To a certain extent, the effect of controlling the shape accuracy of the riveted weld 30 by applying the limiting condition W1=W-1 / [(4~12)×A] can be improved.

[0061] In a preferred embodiment, Figure 4As shown, the size of the connecting hole 31 in the first direction D1 is smaller than the size of the riveting area 302 in the first direction D1, so that the connecting hole 31 is arranged in the middle position of the riveting area 302 along the first direction D1, ensuring reliable measurement of the W1 dimension and avoiding the area adjacent to the connecting hole 31 on the riveted part 30 affecting the measurement of the W dimension.

[0062] In addition, in this embodiment, Figures 1 to 3 As shown, the cell cover further includes a first insulating member 41, a second insulating member 42 and a sealing member 50. The first insulating member 41 and the second insulating member 42 can be made of insulating materials such as PP (polypropylene) or PPS (polyphenylene sulfide), and the sealing member 50 can be made of an elastic sealing ring.

[0063] Specifically, Figures 1 to 3 As shown, the first insulating member 41 is sandwiched between the rivet weld member 30 and the cover body 10 to separate the rivet weld member 30 from the cover body 10 to prevent the rivet weld member 30 and the pole 20 from contacting the cover body 10 and causing a short circuit.

[0064] Furthermore, if Figures 1 to 3 As shown, the second insulating member 42 is arranged on the side of the cover body 10 facing the inside of the battery cell, and part of the second insulating member 42 is clamped between the pole 20 and the cover body 10, specifically, between the connecting portion 24 and the cover body 10 as described above, so as to separate the cover body 10 from the connecting portion 24 and the pole group inside the battery cell, thereby further forming insulation protection for the cover body 10 and reducing the risk of short circuit.

[0065] Furthermore, in this embodiment, if Figure 1 As shown, the seal 50 is formed into an annular structure to be sleeved on the circumferential side wall of the pole 20, specifically the circumferential side wall of the second column portion 23 as described above. In the thickness direction of the battery cover, part of the seal 50 is clamped between the cover body 10 and the connecting portion 24 of the pole 20, and the remaining seal 50 is clamped between the mounting hole 11 and the pole 20, thereby ensuring the sealing of the battery cover.

[0066] In an alternative embodiment, Figures 1 to 3 As shown, the battery cover also includes a pressure relief component 60, which can be an explosion-proof valve and an explosion-proof patch. An exhaust hole is opened on the cover body 10, and the exhaust hole is a through hole. The explosion-proof valve is installed in the exhaust hole. When the battery cell fails and the internal gas produces gas to a preset pressure, the explosion-proof valve opens to relieve pressure and avoid the risk of explosion of the battery cell. The explosion-proof patch is arranged on the side of the cover body 10 facing the outside of the battery cell to protect the explosion-proof valve and avoid external impact causing the explosion-proof valve to open prematurely, thereby affecting the service life of the battery cell.

[0067] In this embodiment, the pole 20 on the cell cover can be a positive pole 20 or a negative pole 20. When there are multiple poles 20 on the cell cover, some of the poles 20 can be positive poles 20 and the remaining poles 20 can be negative poles 20. In addition, a liquid injection hole can be provided on the cover body 10. The liquid injection hole is a through-hole structure for injecting electrolyte into the cell.

[0068] According to a battery cell cover provided by the present invention, the pole and the riveted weld part are first riveted and then welded, the riveted weld part is divided into a riveted area and a welding reserved area, the connecting hole is arranged in the riveted area, and the relationship between the riveted area, the welding reserved area and the distance between the connecting hole and the edge of the riveted weld part is limited to satisfy W1=W-1 / [(4~12)×A], so that the shape accuracy and dimensional accuracy of the riveted weld part after riveting meet the appearance requirements, lay a good foundation for subsequent welding, and effectively improve the yield rate of the assembled battery cell cover plate, thereby ensuring the product quality of the battery cell.

[0069] A battery cell provided according to the present invention comprises the battery cell cover plate as described above, and thus has all the beneficial effects of the battery cell cover plate, which will not be described in detail herein.

[0070] 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, mounted in the mounting hole, with a portion of the pole extending out of the cover plate body; A riveted welding part is provided with a connection hole, the pole extends into the connection hole, and is first riveted and then welded with the riveted welding part; a riveted area and a welding reserved area arranged along a first direction are formed on the riveted welding part, the connection hole is arranged at the middle position of the riveted area in the first direction, the size of the riveted area in the first direction is L, the size of the connection hole in the first direction is D0, and the minimum distance between the edge of the connection hole and the edge of the riveted area in the first direction is L1, 1≤L / D0≤1.5, and / or 1mm≤L1≤5.5mm; Before riveting, W1=W-1 / [(4~12)×A]; Wherein, W is the size of the welding reserved area in the second direction, in mm; W1 is the size of the riveted area in the second direction, in mm; A is the minimum distance between the connecting hole and the edge of the riveted part in the second direction, in mm; 1mm≤A≤15mm.

2. The cell cover plate according to claim 1, characterized in that: (D+2A-0.1)mm≤W≤(D+2A+0.1)mm, where D is the size of the connecting hole in the second direction.

3. The cell cover plate according to claim 2, characterized in that: D≥1mm.

4. The cell cover plate according to claim 1, characterized in that: Along the first direction, the welding reserved areas are arranged on both sides of the riveting area.

5. The cell cover plate according to claim 1, characterized in that: There is a gap between the riveting area and the welding reserved area in the first direction; Alternatively, the remaining portion of the riveted component except the riveted area is formed as the welding reserved area.

6. The cell cover plate according to claim 1, characterized in that: A size of the connecting hole in the first direction is smaller than a size of the riveting area in the first direction.

7. The cell cover plate according to claim 1, characterized in that: After riveting, the pole includes a swelling portion, a first column portion, a second column portion and a connecting portion arranged in sequence along the axial direction; the connecting hole is formed as a stepped hole, the swelling portion and the first column portion are arranged in the connecting hole, a part of the second column portion is arranged in the mounting hole, and the connecting portion is arranged on the side of the cover plate body facing the inside of the battery cell.

8. The cell cover plate according to claim 1, characterized in that: Also includes: A first insulating member, sandwiched between the riveted member and the cover plate body; The second insulating member is arranged on a side of the cover body facing the inside of the battery cell, and a portion of the second insulating member is sandwiched between the pole and the cover body.

9. A battery cell, characterized in that: The invention comprises a cell cover plate as described in any one of claims 1 to 8.

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