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 rivet piece is provided with a rivet hole, and one end of a pole extending out of the mounting hole and facing the outside of the battery cell is riveted to the rivet hole; a convex portion is formed on the inner wall of the rivet hole, so that the rivet hole is formed into a stepped hole structure having a first step portion and a second step portion; the first step portion encloses a main rivet area, and the pole located in the main rivet area expands toward the direction close to the first step portion to achieve riveting; the second step portion encloses a secondary rivet area, and there is a gap between the pole in the secondary rivet area and the rivet hole. The present invention reserves a space for expansion in the secondary rivet area to avoid extrusion caused by the second step portion of the pole, and reduces the risk of the rivet piece having a width exceeding the tolerance after riveting, thereby improving the assembly quality of the battery cell cover, and further improving the yield and safety performance 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 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] Lithium battery cover is a key component in lithium-ion batteries. Its functions are to weld with the shell to form a sealed cavity, lead out the positive and negative electrodes of the electrode group, and serve as an assembly carrier. The traditional cover is a riveted structure of the pole and the riveted block. The riveted block is generally made of aluminum and is easily deformed by extrusion. Therefore, after the pole is riveted, the riveted block is also prone to expand outward, causing the riveted block to have a dimensional tolerance problem, affecting the assembly quality of the cover, thereby affecting the safety performance of the product and bringing safety risks. 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, so as to solve the problem that after the pole and the rivet block on the existing battery cell cover are riveted, the rivet block is prone to expand outward, causing the rivet block to have dimensional tolerances, affecting the assembly quality of the battery cell cover and thus affecting the safety performance of the battery cell.

[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, mounted in the mounting hole, with an axial end of the pole extending out of the mounting hole;

[0008] A riveting piece is provided with a riveting hole, and one end of the pole extending out of the mounting hole and facing the outside of the battery cell is riveted to the riveting piece;

[0009] The inner wall of the rivet hole is formed with a convex portion, so that the rivet hole is formed into a stepped hole structure having a first step portion and a second step portion; the first step portion surrounds a main rivet area, and the pole located in the main rivet area expands toward a direction close to the first step portion to achieve riveting; the second step portion surrounds a secondary rivet area, and there is a gap between the pole in the secondary rivet area and the rivet hole;

[0010] The pole located in the secondary riveting area is formed with a guide portion protruding toward the second step portion, and the second step portion is formed with a guide groove for the guide portion to extend into.

[0011] Preferably, the first step portion is arranged at an end away from the cover plate body;

[0012] In the first direction and / or the second direction, a size of the first step portion is greater than a size of the second step portion.

[0013] Preferably, the cover plate body is formed as a rectangular plate-shaped structure, and the protruding direction of the guide portion is the length or width direction of the cover plate body.

[0014] Preferably, the dimension of the guide portion in the first direction or the second direction is m, the dimension of the guide groove in the first direction or the second direction is n, and the assembly coefficient of the guide portion and the guide groove is θ, θ=(nm) / n, 0.065≤θ≤0.13.

[0015] Preferably, a plurality of the guide portions are provided, at least two of the guide portions are arranged opposite to each other, and the guide grooves are arranged in one-to-one correspondence with the guide portions.

[0016] Preferably, the distance between the two guide portions opposite to each other is d4, the distance between the two guide grooves opposite to each other is d3, and the assembly clearance coefficient between the guide portion and the guide groove is γ, γ=(d3-d4) / d3, 0.01≤γ≤0.03.

[0017] Preferably, the aperture size of the portion of the second step portion that does not have the guide groove is d2, the radial size of the portion of the pole located in the secondary riveting area that does not have the guide portion is d1, and the material expansion coefficient of the pole after riveting is β, β=(d2-d1) / d1, 0.02≤β≤0.04.

[0018] Preferably, the cell cover plate further comprises:

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

[0020] A second insulating member is arranged on a side of the cover body facing the inside of the battery cell;

[0021] A sealing member is sandwiched between the cover plate body and the pole.

[0022] 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.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The battery cell cover plate of the present invention has a cover plate main body provided with a mounting hole; the pole is assembled in the mounting hole, and both ends of the pole in the axial direction extend out of the mounting hole; the rivet piece has a rivet hole, and the end of the pole extending out of the mounting hole and facing the outside of the battery cell is riveted to the rivet hole; the inner wall of the rivet hole is formed with a convex portion, so that the rivet hole is formed into a stepped hole structure with a first step portion and a second step portion; the first step portion surrounds a main rivet area, and the pole located in the main rivet area expands toward a direction close to the first step portion to achieve riveting; the second step portion surrounds a secondary rivet area, and a gap is provided between the pole and the rivet hole in the secondary rivet area, so that expansion space is reserved in the secondary rivet area to avoid the pole from squeezing the second step portion during riveting, and reduce the risk of the rivet piece having a width exceeding the tolerance after riveting, thereby improving the assembly quality of the battery cell cover plate and improving the yield and safety performance of the battery cell.

[0025] 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

[0026] 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.

[0027] Figure 1 A schematic diagram of the structure of a cell cover plate before riveting provided by an embodiment of the present invention;

[0028] Figure 2 For along Figure 1 The cross-section taken at AA in the middle;

[0029] Figure 3 For along Figure 1 The cross-section taken at BB in the middle;

[0030] Figure 4 A schematic diagram of the structure of a pole in a cell cover provided by an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of a top view of a pole in a cell cover provided by an embodiment of the present invention;

[0032] Figure 6 For along Figure 5 Cross-section taken at CC;

[0033] Figure 7 For along Figure 5 The cross-section taken at DD in the middle;

[0034] Figure 8 A schematic diagram of the structure of a riveted part in a cell cover provided by an embodiment of the present invention;

[0035] Fig. 9 For along Figure 8 The cross-section taken at EE in the middle;

[0036] Fig.10 For along Figure 8 A cross-sectional view taken at FF in the middle;

[0037] Fig.11 A schematic diagram of the structure of a cell cover plate after riveting provided by an embodiment of the present invention;

[0038] Fig.12 For along Fig.11 The cross-section taken at GG in the middle;

[0039] Fig.13 For along Fig.11 Cross-sectional view taken at HH in the middle.

[0040] Icons: 10-cover body; 11-mounting hole; 20-pole; 21-connecting part; 22-guide part; 30-rivet; 31-rivet hole; 310-protrusion; 311-first step; 312-second step; 313-guide groove; 41-first insulating part; 42-second insulating part; 50-sealing part; P1-primary rivet area; P2-secondary rivet area; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 rivet 30 .

[0051] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0052] In this embodiment, if Figures 1 to 3 As shown, a mounting hole 11 is opened on the cover body 10, and the mounting hole 11 is a through hole structure that penetrates the cover body 10 along the thickness direction of the cover body 10. The cover body 10 is a plate-like structure. Specifically, the cover body 10 can be formed into a rectangular plate-like structure. However, the shape of the cover body 10 is not limited to this and can be set according to the opening shape of the battery cell shell.

[0053] like Figures 1 to 4 As shown, the rivet 30 is a block structure and is provided with a rivet hole 31, which is a through-hole structure penetrating the rivet 30. The pole 20 is assembled in the mounting hole 11, and the end of the pole 20 in the axial direction extends out of the mounting hole 11, wherein the end of the pole 20 extending out of the mounting hole 11 and facing the outside of the battery cell is riveted and connected to the rivet 30; the end of the pole 20 extending out of the mounting hole 11 and facing the inside of the battery cell is formed as a connecting portion 21, which is used to connect the pole group inside the battery cell, and the connecting portion 21 can be a plate-like structure in a polygonal, circular or elliptical shape.

[0054] In this embodiment, the pole 20 may be made of copper or aluminum, and the rivet 30 may be made of aluminum.

[0055] Specifically, in this embodiment, a convex portion 310 is formed on the inner wall of the rivet hole 31, and the convex portion 310 is an annular structure provided on one side close to the cover plate body 10, so that the rivet hole 31 is formed into a stepped hole structure having a first step portion 311 and a second step portion 312, and the first step portion 311 and the second step portion 312 are arranged sequentially along the axis of the rivet hole 31; Figures 1 to 3 and Figures 11 to 13 As shown, the first step portion 311 encloses a main riveting area P1, and the pole 20 located in the main riveting area P1 expands toward the direction close to the first step portion 311 to achieve riveting of the pole 20 and the rivet 30; the second step portion 312 encloses a secondary riveting area P2, and there is a gap between the pole 20 and the rivet hole 31 in the secondary riveting area P2, so that a space for expanding the material is reserved in the secondary riveting area P2 to avoid extrusion caused by the second step portion 312 of the pole 20, reduce the risk of the rivet 30 having a width exceeding the tolerance after riveting, and thus improve the assembly quality of the battery cover.

[0056] More specifically, if Figure 3 As shown, the first step portion 311 is arranged at one end away from the cover body 10, so that the main rivet area P1 is located on the side facing away from the cover body 10 relative to the secondary rivet area P2; in the first direction D1 and / or the second direction D2, the size of the first step portion 311 is larger than the size of the second step portion 312, and the first direction D1 is perpendicular to the second direction D2. When the cover body 10 is a rectangular plate-like structure, the first direction D1 may be the length direction of the cover body 10, and the second direction D2 may be the width direction of the cover body 10.

[0057] The cross section of the portion of the pole 20 other than the connecting portion 21 in the direction perpendicular to the axis of the pole 20 may be circular, and the rivet hole 31 is correspondingly formed as a hole structure with a circular cross section.

[0058] It should be noted that in the prior art, the dimensional tolerance problem of the riveting block mainly lies in the dimension of the riveting block in the second direction D2.

[0059] In this embodiment, as 4 to Fig.10 As shown, the side wall of the pole 20 located in the secondary riveting area P2 is formed with a guide portion 22 protruding toward the second step portion 312, and the guide portion 22 can be formed into a convex block structure. The second step portion 312 is formed with a guide groove 313 for the guide portion 22 to extend into, so that the pole 20 and the rivet 30 form a guide positioning in the secondary riveting area, avoiding a gap between the pole 20 and the rivet 30 so that the pole 20 is biased toward one side of the rivet hole 31, ensuring that the pole 20 is located in the middle position of the rivet hole 31.

[0060] In a preferred embodiment, Figures 4 to 7As shown, when the cover body 10 is formed into a rectangular plate-like structure, the protruding direction of the guide portion 22 is preferably the length direction of the cover body 10, which effectively solves the problem of dimensional tolerance of the rivet 30 in the second direction D2 and does not affect the structural strength of the cover body 10. However, in other optional embodiments, the protruding direction of the guide portion 22 may also be the width direction of the cover body 10.

[0061] Preferably, the end of the guide portion 22 in the first direction D1 abuts against the guide groove 313 , thereby ensuring reliable positioning of the pole 20 and the rivet 30 .

[0062] Furthermore, in this embodiment, if Figure 5 and Figure 8 As shown, the dimension of the guide portion 22 in the first direction D1 or the second direction D2 is m. Specifically, when the protruding direction of the guide portion 22 is the length direction of the cover body 10, the dimension of the guide portion 22 in the second direction D2 is m; when the protruding direction of the guide portion 22 is the width direction of the cover body 10, the dimension of the guide portion 22 in the first direction D1 is m; the dimension of the guide groove 313 in the first direction D1 or the second direction D2 is n. Specifically, when the protruding direction of the guide portion 22 is the length direction of the cover body 10, the dimension of the guide groove 313 in the first direction D1 or the second direction D2 is n. direction, the dimension of the guide groove 313 in the second direction D2 is n; when the protruding direction of the guide portion 22 is the width direction of the cover body 10, the dimension of the guide groove 313 in the first direction D1 is n, and the assembly coefficient of the guide portion 22 and the guide groove 313 is θ, θ=(nm) / n, 0.065≤θ≤0.13, which facilitates the assembly and positioning of the pole 20 and the rivet 30 before riveting, and reserves a certain amount of material expansion space, ensuring that the rivet 30 is easy to assemble and the battery cover has a good appearance quality.

[0063] Preferably, after assembly, the symmetry of the rivet 30 relative to the cover plate body 10 satisfies ≤0.2, thus ensuring the riveting quality.

[0064] Next, multiple cell cover plates with the same m size but different n sizes are assembled, and the symmetry of the assembled rivet 30 is tested to verify whether the limited range of 0.065≤θ≤0.13 can meet the appearance quality requirement of symmetry ≤0.2. The test results are shown in Tables 1 to 3 below.

[0065] Table 1

[0066]

[0067] Table 2

[0068]

[0069] Table 3

[0070]

[0071] Referring to Tables 1 to 3, in Examples 1-1 to 1-5, Examples 2-1 to 2-5, and Examples 3-1 to 3-5, θ is within the limited range of 0.065 to 0.13, and the rivet 30 has high assembly efficiency and the degree of symmetry after assembly meets the requirement of ≤0.2; while in Comparative Examples 1-1, 1-2, 2-1, 2-2, 3-1, and 3-2, assembly difficulties occur, and in Comparative Examples 1-3, 1-4, 2-3, 2-4, 3-3, and 3-4, the degree of symmetry of the rivet 30 relative to the cover body 10 is greater than 0.2, resulting in unqualified appearance quality of the cell cover. In this embodiment, Figures 4 to 7 As shown, there are multiple guide portions 22, at least two of which are arranged opposite to each other, and the guide grooves 313 are arranged one-to-one with the guide portions 22, so as to ensure positioning reliability. Preferably, the two guide portions 22 are arranged on both sides of the pole 20 in the first direction D1.

[0072] Furthermore, in this embodiment, if Figure 6 and Fig. 9 As shown, the distance between the two guide portions 22 opposite to each other is d4. Specifically, for example, when the two guide portions 22 are arranged at intervals along the first direction D1, the maximum distance between the side walls of the two guide portions 22 opposite to each other in the first direction D1 is d4. For example, when the two guide portions 22 are arranged at intervals along the second direction D2, the maximum distance between the side walls of the two guide portions 22 opposite to each other in the second direction D2 is d4. The distance between the two guide grooves 313 opposite to each other is d3. Specifically, for example, when the two guide grooves 313 are arranged at intervals along the first direction D1, the maximum distance between the groove walls of the two guide grooves 313 opposite to each other in the first direction D1 is d4. For example, when the two guide portions 22 are arranged at intervals along the second direction D2, the maximum distance between the groove walls of the two guide grooves 313 opposite to each other in the first direction D1 is d4. When arranged in an interval direction D2, the maximum distance between the groove walls of the two guide grooves 313 facing each other in the second direction D2 is d4; the assembly clearance coefficient between the guide portion 22 and the guide groove 313 is γ, γ=(d3-d4) / d3, 0.01≤γ≤0.03, which facilitates the assembly and positioning of the pole 20 and the rivet 30 before riveting, and reserves a certain amount of material expansion space to meet the material expansion requirements of the pole 20 located in the secondary riveting area in the first direction D1 or the second direction D2, and ensures that after the rivet 30 is assembled with the pole 20, the minimum distance L between the end of the rivet 30 close to the edge of the cell cover and the edge of the cover body 10 in the length direction of the cover body 10 is within the set tolerance range.

[0073] Next, multiple cell cover plates with the same d3 size but different d4 sizes are assembled to study the effect of different assembly gap coefficients γ on L, in order to verify whether the limited range of 0.01≤γ≤0.03 can ensure that L is within the set tolerance range. The test results are shown in Tables 4 to 6 below.

[0074] Table 4

[0075]

[0076] Table 5

[0077]

[0078] Table 6

[0079]

[0080] Referring to Tables 4 to 6, in Examples 4-1 to 4-5, 5-1 to 5-5, and 6-1 to 6-5, γ is within the limited range of 0.01 to 0.03, the rivet 30 and the pole 20 are easy to assemble, the installation efficiency is high, and the dimensional tolerance of L after assembly is within the range of ±0.15mm, ensuring the quality of the assembled battery cover; while in Comparative Examples 4-1, 4-2, 5-1, 5-2, 6-1, and 6-2, assembly difficulties occurred, and in Comparative Examples 4-3, 4-4, 5-3, 5-4, 6-3, and 6-4, the dimensional tolerance of L after assembly of the rivet 30 exceeded the range of ±0.15mm, resulting in unqualified appearance quality of the battery cover. Furthermore, as Figure 7 and Fig.10 As shown, the aperture size of the portion of the second step portion 312 that does not have the guide groove 313 is d2 (i.e., d2 does not include n as described above), and the radial size of the portion of the pole 20 located in the secondary riveting area that does not have the guide portion 22 is d1 (i.e., d1 does not include m as described above). The expansion coefficient of the pole 20 after riveting is β, β=(d2-d1) / d1, 0.02≤β≤0.04, so that a relatively large gap is set at a position other than the guide portion 22 and the guide groove 313 to reserve sufficient expansion space, so as to avoid the pole 20 from squeezing the riveted part 30 in the secondary riveting area after riveting, thereby avoiding the problem of the width dimension M of the riveted part 30 being out of tolerance, and ensuring that the resistance R between the pole 20 and the riveted part 30 after riveting is ≤0.035mΩ.

[0081] Next, multiple cell cover plates with the same d1 size but different d2 sizes are assembled to study the effects of different assembly gap coefficients β on M and R, in order to verify whether the limited range of 0.02≤β≤0.04 can ensure that M is within the set tolerance range and R≤0.035mΩ. The test results are shown in Tables 7 to 9 below.

[0082] Table 7

[0083]

[0084] Table 8

[0085]

[0086] Table 9

[0087]

[0088] Referring to Tables 7 to 9, in Examples 7-1 to 7-5, 8-1 to 8-5, and 9-1 to 9-5, β is within the limited range of 0.02~0.04, and the dimensional tolerance of M after the rivet 30 is assembled is within the range of ±0.2mm, and R≤0.035mΩ is guaranteed; while in Comparative Examples 7-1 to 7-3, 8-1 to 8-3, 9-1, and 9-3, the width dimension M of the rivet 30 is out of tolerance, and in Comparative Examples 7-4 to 7-6, 8-4 to 8-6, and 9-4 to 9-6, the resistance is greater than 0.035mΩ, which does not meet the requirements for battery cell use.

[0089] In addition, in this embodiment, Figures 1 to 3 and Figures 11 to 13 As shown, the cell cover also includes a first insulating member 41, a second insulating member 42 and a sealing member 50. The first insulating member 41 and / or the second insulating member 42 can be made of materials such as PP or PPS, and the sealing member 50 can be made of fluororubber material. The first insulating member 41 is an annular structure. In the thickness direction of the cover body 10, the first insulating member 41 is arranged between the rivet 30 and the cover body 10 to form insulation protection for the cover body 10. Part of the first insulating member 41 is coated on the circumferential side wall of the rivet 30 to improve the reliability of insulation protection. The second insulating member 42 is arranged on the side of the cover body 10 facing the inside of the cell, and part of the second insulating member 42 is sandwiched between the connecting portion 21 and the cover body 10 to separate the pole 20 and the cover body 10, thereby forming insulation protection.

[0090] The seal 50 is sandwiched between the cover body 10 and the pole 20. The seal 50 is formed into an annular structure. Specifically, part of the seal 50 is sandwiched between the cover body 10 and the connecting portion 21, and the remaining part of the seal 50 is sandwiched between the hole wall of the mounting hole 11 and the circumferential side wall of the pole 20, thereby ensuring reliable assembly and sealing of the pole 20 and the cover body 10.

[0091] Preferably, the first insulating member 41 and the second insulating member 42 are respectively crimped to the sealing member 50 , so that the pole 20 and the cover plate body 10 are completely separated while ensuring reliable sealing, thereby avoiding the problem of short circuit caused by metal overlap.

[0092] According to a battery cell cover provided by the present invention, a mounting hole is provided in the cover plate body; the pole is assembled in the mounting hole, and both ends of the pole in the axial direction extend out of the mounting hole; the rivet piece is provided with a rivet hole, and the end of the pole extending out of the mounting hole and facing the outside of the battery cell is riveted to the rivet hole; a convex portion is formed on the inner wall of the rivet hole, so that the rivet hole is formed into a stepped hole structure with a first step portion and a second step portion; the first step portion surrounds a main rivet area, and the pole located in the main rivet area expands toward a direction close to the first step portion to achieve riveting; the second step portion surrounds a secondary rivet area, and there is a gap between the pole and the rivet hole in the secondary rivet area, so that expansion space is reserved in the secondary rivet area to avoid the pole from squeezing the second step portion during riveting, thereby reducing the risk of the rivet piece having a width exceeding the tolerance after riveting, thereby improving the assembly quality of the battery cell cover.

[0093] A battery cell provided according to the present invention includes the battery cell cover as described above, which reduces the risk of width deviation of the riveted parts after riveting, thereby improving the assembly quality of the battery cell cover, and further improving the yield and safety performance of the battery cell.

[0094] 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 an axial end of the pole extending out of the mounting hole; A riveting piece is provided with a riveting hole, and one end of the pole extending out of the mounting hole and facing the outside of the battery cell is riveted to the riveting piece; The inner wall of the rivet hole is formed with a convex portion, so that the rivet hole is formed into a stepped hole structure having a first step portion and a second step portion; the first step portion surrounds a main rivet area, and the pole located in the main rivet area expands toward a direction close to the first step portion to achieve riveting; the second step portion surrounds a secondary rivet area, and there is a gap between the pole in the secondary rivet area and the rivet hole; The pole located in the secondary riveting area is formed with a guide portion protruding toward the second step portion, and the second step portion is formed with a guide groove for the guide portion to extend into; In the protruding direction of the guide portion, the end of the guide portion close to the second step portion extends out of the circumferential side wall of the pole facing the outside of the battery cell after riveting.

2. The cell cover plate according to claim 1, characterized in that: The first step portion is arranged at an end away from the cover plate body; In the first direction and / or the second direction, a size of the first step portion is greater than a size of the second step portion.

3. The cell cover plate according to claim 1, characterized in that: The cover plate body is formed as a rectangular plate-shaped structure, and the protruding direction of the guide portion is the length or width direction of the cover plate body.

4. The cell cover plate according to claim 1, characterized in that: The dimension of the guide portion in the first direction or the second direction is m, the dimension of the guide groove in the first direction or the second direction is n, and the assembly coefficient of the guide portion and the guide groove is θ, θ=(nm) / n, 0.065≤θ≤0.

13.

5. The cell cover plate according to claim 1, characterized in that: There are multiple guide parts, at least two of which are arranged opposite to each other, and the guide grooves are arranged in one-to-one correspondence with the guide parts.

6. The cell cover plate according to claim 5, characterized in that: The distance between the two guide parts opposite to each other is d4, the distance between the two guide grooves opposite to each other is d3, and the assembly clearance coefficient between the guide parts and the guide grooves is γ, γ=(d3-d4) / d3, 0.01≤γ≤0.

03.

7. The cell cover plate according to claim 1, characterized in that: The aperture size of the portion of the second step portion that does not have the guide groove is d2, the radial size of the portion of the pole located in the secondary riveting area that does not have the guide portion is d1, and the expansion coefficient of the pole after riveting is β, β=(d2-d1) / d1, 0.02≤β≤0.

04.

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

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

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