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 is arranged in the mounting hole; a connecting hole is formed in the riveting piece, and one end, extending out of the mounting hole, of the pole is riveted with the connecting hole, so that part of the pole forms a material expansion part; the preset length size of the riveting piece in the first direction is M, and the unit is mm; the preset width size in the second direction is N, and the unit is mm; the radial size of the part, used for containing the material expanding part, of the connecting hole is d, and the unit is mm; (M-d) / (N-d) < = 8. According to the invention, the condition that the circumferential edge of the riveting piece is warped can be effectively avoided, so that the problem that the flatness is out of tolerance after the riveting piece and the pole are assembled is solved, the size and shape tolerance of the assembled pole meet the requirements, the reliable riveting of the pole and the riveting piece is ensured, the yield of the battery cell cover plate and the battery cell is improved, and the production cost is reduced. The use safety of the battery cell is ensured.

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.

[0003] The 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 includes a riveted block, an upper plastic, a pole, a top cover sheet, a lower plastic, a sealing ring and other structures. The pole passes through the sealing ring, the lower plastic, the top cover sheet, the upper plastic, and finally through the riveted block hole. The pole is riveted so that the top of the pole is squeezed toward the sink of the riveted block to complete the assembly. The riveted block is generally made of aluminum. After riveting and welding, the center of the riveted block is subjected to extrusion force and welding thermal stress, which causes the surrounding of the riveted block to warp, resulting in poor flatness and reducing the yield rate of the cover. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a battery cell cover plate and a battery cell, so as to solve the problem that the riveted blocks on the existing battery cell cover plates are warped around the riveted blocks due to the extrusion force and welding thermal stress after riveting and welding, resulting in poor flatness of the riveted blocks and low cover plate yield.

[0005] A first aspect of the present invention provides a cell cover, wherein the cell cover comprises: The cover plate body is provided with a mounting hole; A pole, arranged in the mounting hole; A rivet is provided with a connecting hole, and one end of the pole extending out of the mounting hole is riveted to the connecting hole, so that part of the pole is formed into a swelling portion; the preset length dimension of the rivet in the first direction is M, in mm; the preset width dimension in the second direction is N, in mm; the radial dimension of the part of the connecting hole for accommodating the swelling portion is d, in mm; (Md) / (Nd)≤8.

[0006] Preferably, the connecting hole is formed as a stepped hole having a first step section and a second step section, the radial dimension of the first step section is smaller than the radial dimension of the second step section, and the swelling portion is formed by expanding the circumferential side wall of the pole along the direction close to the hole wall of the second step section.

[0007] Preferably, after riveting, the shortest distance between the second step section and the edge of the riveted part in the first direction is m, and the shortest distance between the second step section and the edge of the riveted part in the second direction is n, n≥2mm, m / n≤8.

[0008] Preferably, the connecting hole has a third step section, the first step section, the second step section and the third step section are arranged sequentially along the axial direction of the connecting hole, and the radial dimension of the first step section is less than the radial dimension of the second step section and less than the radial dimension of the third step section.

[0009] Preferably, after riveting, the actual maximum width dimension of the riveted part in the second direction is D, -0.2mm≤DN≤0.2mm.

[0010] Preferably, the flatness tolerance of the upper surface of the rivet is less than or equal to 0.3 mm.

[0011] Preferably, the rivet is formed into a rectangular block structure, the first direction is the length direction of the rivet, and the second direction is the width direction of the rivet.

[0012] Preferably, the cell cover plate further comprises: A first insulating member, sandwiched between the cover plate body and the riveted member, a portion of the first insulating member being disposed around a circumferential side wall of the riveted member; A second insulating member, sandwiched between the bottom plate of the pole and the cover plate body; A sealing member is sandwiched between the bottom plate and the cover plate body, and a portion of the sealing member is sandwiched between the mounting hole and the circumferential side wall of the pole.

[0013] Preferably, the cover plate body is provided with a liquid injection hole and / or an exhaust hole communicating with the inside and outside of the battery core.

[0014] 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.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the battery cell cover of the present invention, the pole is riveted to the connecting hole on the riveted piece, so that an outwardly expanding bulging portion is formed on the pole; the preset length dimension of the rivet in the first direction is M; the preset width dimension of the rivet in the second direction is N; the radial dimension of the part of the connecting hole for accommodating the bulging portion is d, and by limiting (Md) / (Nd)≤8, the circumferential edge of the rivet can be effectively prevented from warping, thereby solving the problem of excessive flatness after the rivet and the pole are assembled, thereby ensuring that the size and shape tolerances of the assembled pole meet the requirements, ensuring that the pole and the rivet are riveted reliably, thereby improving the yield rate of the battery cell cover and the battery cell, and ensuring the safe use of the battery cell.

[0016] 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

[0017] 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.

[0018] Figure 1 A schematic diagram of the structure of a cell cover plate provided in an embodiment of the present invention; Figure 2 An exploded view of the structure of a cell cover provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a riveted deformation area in a cell cover provided by an embodiment of the present invention; Figure 4 A schematic structural diagram of a cell cover provided by an embodiment of the present invention from another perspective; Figure 5 For along Figure 4 The cross-section taken at AA in the middle; Figure 6 A structural cross-sectional view of a riveted part in a cell cover provided by an embodiment of the present invention; Figure 7 For along Figure 6 Cross-sectional view taken at BB in the middle.

[0019] Icons: 10-cover body, 11-mounting hole; 12-liquid injection hole; 20-pole; 21-inflating part; 22-bottom plate; 30-rivet; 31-connecting hole; 311-first step section; 312-second step section; 313-third step section; 41-first insulating part; 42-second insulating part; 50-sealing part; 60-riveted deformation area; D1-first direction; D2-second direction. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 .

[0030] Hereinafter, the specific structure of the cell cover plate as described above according to this embodiment will be described.

[0031] In this embodiment, if Figures 1 to 5 As shown, the cover plate body 10 is formed into a plate-like structure, such as a rectangular or circular plate-like structure. When the battery cell is a square battery cell or a blade battery cell, the cover plate body 10 is a rectangular plate-like structure, and when the battery cell is a cylindrical battery cell, the cover plate body 10 is a circular plate-like structure. The cover plate body 10 is provided with a mounting hole 11, and the mounting hole 11 is formed into a through-hole structure that penetrates the cover plate body 10.

[0032] In addition, an injection hole 12 and / or an exhaust hole are also provided on the cover body 10. The injection hole 12 or the exhaust hole is formed as a through-hole structure that penetrates the cover body 10 to connect the inside and the outside of the battery cell. After the battery cover and the battery cell shell are assembled, the electrolyte can be injected into the battery cell through the injection hole 12, and then the injection hole 12 is closed. Pressure relief components such as explosion-proof valves are installed at the exhaust hole. When the battery cell fails and produces gas, the pressure relief component can open at a preset pressure to discharge the gas in time, thereby reducing the risk of battery cell explosion and fire.

[0033] In this embodiment, if Figures 1 to 5 As shown, the pole 20 is arranged in the mounting hole 11, and both ends of the pole 20 in the axial direction extend out of the mounting hole 11. A protruding bottom plate 22 is formed at the end of the pole 20 facing the inside of the battery cell, which is used to connect the pole group inside the battery cell. The bottom plate 22 can be a plate-like structure such as a polygonal, circular or elliptical shape.

[0034] In this embodiment, the main body of the pole 20 is a cylindrical structure.

[0035] Preferably, there is one electrode 20 on the cell cover, and the electrode 20 is a positive electrode or a negative electrode.

[0036] like Figures 1 to 7As shown, a connection hole 31 is opened on the rivet 30, and one end of the pole 20 facing the outside of the battery cell and extending out of the mounting hole 11 is riveted to the connection hole 31, so that part of the pole 20 is formed into a bulging portion 21, and the bulging portion 21 is a boss structure extending radially outward from the side wall of the main body of the pole 20, and the bulging portion 21 is formed by the pole 20 being bulged toward its circumferential side wall under the extrusion force; the preset length dimension of the rivet 30 in the first direction D1 is M, in mm; the preset width dimension in the second direction D2 is N, in mm; the connection hole 31 is used for The radial dimension of the portion accommodating the swelling portion 21 is d, in mm; (Md) / (Nd)≤8. By limiting the aspect ratio of the size of the rivet 30 excluding the riveted portion, the circumferential edge of the rivet 30 can be effectively prevented from warping, thereby solving the problem of excessive flatness after the rivet 30 and the pole 20 are assembled, thereby ensuring that the size and shape tolerances of the assembled pole 20 meet the requirements, ensuring that the pole 20 and the rivet 30 are riveted reliably, thereby improving the yield rate of the battery cover and the battery cell, and ensuring the safety of the battery cell.

[0037] It should be noted that the preset size is the design size of the cell cover. Under the influence of processing errors, the actual measured size of the cell cover after assembly often deviates from the preset size. In addition, in the present embodiment, the axial direction is the thickness direction of the cover body 10, and the radial direction is the direction perpendicular to the axial direction. For example, the radial dimension d can be the dimension of the part of the connection hole 31 for accommodating the material expansion portion 21 in the first direction D1, or the dimension of the part of the connection hole 31 for accommodating the material expansion portion 21 in the second direction D2. It does not mean that the cross section of the part of the connection hole 31 for accommodating the material expansion portion 21 perpendicular to the axial direction must be circular; it should be further explained that when the cross section of the part of the connection hole 31 for accommodating the material expansion portion 21 perpendicular to the axial direction is circular, d is the diameter of the circle; if the cross section of the part of the connection hole 31 for accommodating the material expansion portion 21 perpendicular to the axial direction is not circular, d is the maximum length dimension of the cross-sectional shape, and the maximum length of the cross-sectional shape can extend along the first direction D1 or the second direction D2.

[0038] In this embodiment, the first direction D1 is perpendicular to the second direction D2 . The first direction D1 may be the length direction of the rectangular cover body 10 , and the second direction D2 may be the width direction of the rectangular cover body 10 .

[0039] In a preferred embodiment, the rivet 30 is formed into a rectangular block structure, the first direction D1 is the length direction of the rivet 30, and the second direction D2 is the width direction of the rivet 30. However, the shape of the rivet 30 is not limited to this, and can also be formed into a polygonal, elliptical or runway-shaped structure.

[0040] Furthermore, in this embodiment, if Figures 5 to 7As shown, the connecting hole 31 is formed as a stepped hole having a first step section 311 and a second step section 312, wherein the first step section 311, the second step section 312 and the third step section 313 described below can be understood as a section of a through hole in the axial direction of the connecting hole 31, the radial dimension of the first step section 311 is smaller than the radial dimension of the second step section 312, when the connecting hole 31 is formed as a stepped hole, d as described above is the radial dimension of the second step section 312, and after the pole 20 is subjected to the extrusion pressure, part of its circumferential side wall expands in the direction toward the hole wall close to the second step section 312 to form a swelling portion 21, so that the swelling portion 21 is clamped on the boss between the first step section 311 and the second step section 312 to form a riveted connection between the pole 20 and the rivet 30.

[0041] In this embodiment, if Figure 6 and Figure 7 As shown, after the pole 20 and the rivet 30 are riveted, the shortest distance between the second step section 312 and the edge of the rivet 30 in the first direction D1 is m, in mm, and the shortest distance between the second step section 312 and the edge of the rivet 30 in the second direction D2 is n, m / n≤8, which further ensures that after the pole 20 and the rivet 30 are riveted, the circumferential edge of the rivet 30 will not be warped, so as to improve the reliability and effectiveness of solving the problem of flatness tolerance after the rivet 30 and the pole 20 are assembled, and ensure that the size and shape tolerances of the assembled pole 20 meet the requirements, thereby improving the yield rate of the battery cover and the battery.

[0042] In a preferred embodiment, n≥2 mm, thus ensuring that there is a sufficient distance between the edge of the rivet 30 and the connecting hole 31 in the second direction D2, thereby improving the deformation of the edge of the rivet 30 to a certain extent.

[0043] Furthermore, in this embodiment, if Figures 5 to 7 As shown, the connecting hole 31 has a third step section 313, and the first step section 311, the second step section 312 and the third step section 313 are arranged in sequence along the axial direction of the connecting hole 31, the radial dimension of the first step section 311 is less than the radial dimension of the second step section 312, and the radial dimension of the third step section 313. The first step section 311 is arranged on a side close to the cover plate body 10, and the pole 20 and the rivet 30 are first riveted and then welded, so as to ensure that the pole 20 and the rivet 30 are reliably connected, so that the rivet 30 will not fall off when the pole 20 is subjected to impact force. Specifically, the pole 20 and the rivet 30 are welded by a laser welding process to form a weld mark between the side wall of the swelling portion 21 and the second step section 312, and the setting of the third step section 313 can avoid the weld mark to meet the welding requirements.

[0044] In this embodiment, if Figure 3As shown, after the pole 20 and the rivet 30 are riveted, the rivet 30 forms riveted deformation areas 60 at both ends in the second direction D2. Figure 3 In the portion enclosed by the square frame, the riveted deformation area 60 on the rivet 30 is most likely to warp; after riveting, the actual maximum width dimension of the rivet 30 in the second direction D2 is D, and the measurement position of the dimension D needs to include the riveted deformation areas 60 on both sides of the rivet 30 in the second direction D2.

[0045] Preferably, if Figure 3 and Figure 6 As shown, -0.2 mm ≤ DN ≤ 0.2 mm, thus limiting the size variation range of the edge of the riveted part 30 before and after riveting, thereby ensuring the shape accuracy of the riveted part 30 after riveting.

[0046] In a preferred embodiment, the flatness tolerance of the upper surface of the rivet 30 is less than or equal to 0.3 mm, and the upper surface of the rivet 30 is the side thereof facing away from the cover body 10, thereby ensuring the flatness of the rivet 30 after riveting and meeting the production standards of the battery cover and the use requirements of the battery cell.

[0047] The following test is conducted on the limiting condition of (Md) / (Nd)≤8 to verify whether the limiting condition can solve the problem that the riveted part 30 is prone to warping around the edges and poor flatness after riveting. The test results are shown in the following tests 1 to 3.

[0048] Test 1: d=10mm, N=14mm, multiple tests were conducted with rivet parts 30 having different sizes M, and the size D of the assembled rivet parts 30 at the rivet deformation area 60 and the flatness of the upper surface of the rivet parts 30 were measured for testing. The test results are shown in Table 1 below: Table 1

[0049] Test 2: d=11mm, N=15mm, multiple tests were conducted with rivet parts 30 having different sizes M, and the size D of the assembled rivet parts 30 at the rivet deformation area 60 and the flatness of the upper surface of the rivet parts 30 were measured for testing. The test results are shown in Table 2 below: Table 2

[0050] Test 3: d=11mm, N=16mm, multiple tests were conducted with rivet parts 30 having different sizes M, and the size D of the assembled rivet parts 30 at the rivet deformation area 60 and the flatness of the upper surface of the rivet parts 30 were measured for testing. The test results are shown in Table 3 below: Table 3

[0051] Referring to Tables 1 to 3, it can be seen that in Examples 1-14, 1-15, 2-13 to 2-15, and 3-13 to 3-15, (Md) / (Nd) is greater than 8, resulting in an excessive flatness of the rivet 30, which is greater than 0.3 mm, and the assembly quality of the cell cover cannot be guaranteed; while in Examples 1-1 to 1-13, 2-1 to 2-12, and 3-1 to 3-12, (Md) / (Nd) is less than or equal to 8, and the flatness of the rivet 30 is less than or equal to 0.3 mm, which can effectively avoid the warping of the circumferential edge of the rivet 30, solve the problem of excessive flatness after the rivet 30 and the pole 20 are assembled, thereby ensuring that the size and shape tolerances of the assembled pole 20 meet the requirements, ensuring that the pole 20 and the rivet 30 are reliably riveted, thereby improving the yield rate of the cell cover and the cell, and ensuring the safety of the cell.

[0052] The following test is conducted on the limiting condition of n≥2mm to verify whether the limiting condition can be further optimized to prevent the rivet 30 from warping around the edges and having poor flatness after riveting. The test results are shown in the following test 4 and test 5.

[0053] Test 4: d=10 mm, multiple tests were conducted with riveted parts 30 having different sizes N and n, and the size D of the assembled riveted parts 30 at the riveted deformation area 60 was measured for testing. The test results are shown in Table 4 below: Table 4

[0054] Test 5: d=12 mm, multiple tests were conducted with riveted parts 30 having different sizes N and n, and the size D of the assembled riveted parts 30 at the riveted deformation area 60 was measured for testing. The test results are shown in Table 5 below: Table 5

[0055] Referring to Table 4 and Table 5 above, it can be seen that in Examples 4-1 to 4-8 and Examples 5-1 to 5-8, due to the small size n, the dimension D value of the rivet 30 after riveting is larger than the limited range of -0.2mm≤DN≤0.2mm, and the surface rivet 30 is warped on all sides after riveting, thereby reducing the yield rate of the battery cover; while in Examples 4-9 to 4-15 and Examples 5-9 to 5-15, the size n is greater than or equal to 2mm, so as to ensure that the connection hole 31 and the rivet 30 have a sufficient distance in the second direction D2, avoid the riveting process from causing serious influence on the shape accuracy of the rivet 30, so that the DN after riveting is less than or equal to 0.2mm and greater than or equal to -0.2mm, avoid the rivet 30 from warping on all sides after riveting, thereby improving the flatness of the upper surface of the rivet 30 to a certain extent, and then improving the yield rate of the battery cover.

[0056] In addition, in this embodiment, Figure 1 , Figure 2 , Figure 4 and Figure 5 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 the second insulating member 42 are formed of insulating materials, such as PP (polypropylene) or PPS (polyphenylene sulfide), etc., to achieve insulation protection; the sealing member 50 is elastic, for example, it can be a sealing ring of fluororubber material.

[0057] The first insulating member 41 is disposed outside the battery cell, and the second insulating member 42 is disposed inside the battery cell. Specifically, Figure 1 , Figure 2 and Figure 5 As shown, the first insulating member 41 is sandwiched between the cover body 10 and the rivet 30 to separate the rivet 30 from the cover body 10, thereby providing insulation protection for the cover body 10 and avoiding the situation where the rivet 30 overlaps with the cover body 10 to cause a short circuit. Preferably, part of the first insulating member 41 is surrounded by the circumferential side wall of the rivet 30 to improve the reliability and effectiveness of the insulation protection. The second insulating member 42 is sandwiched between the bottom plate 22 of the pole 20 and the cover body 10 to separate the pole 20 from the cover body 10 and avoid the situation where the pole 20 or the pole group inside the battery cell overlaps with the cover body 10 to cause a short circuit.

[0058] More specifically, the seal 50 is sleeved on the circumferential side wall of the pole 20, wherein part of the seal 50 is sandwiched between the bottom plate 22 of the pole 20 and the cover body 10, and part of the seal 50 is sandwiched between the mounting hole 11 and the circumferential side wall of the pole 20, so as to fill the gap between the cover body 10 and the pole 20, and avoid leakage or seepage after the battery cell is assembled. Preferably, after the battery cell cover is assembled, the first insulating member 41 and the second insulating member 42 are overlapped with the seal 50, so that the cover body 10 is completely separated from the pole 20 and the rivet 30, which can improve the insulation performance while ensuring the sealing performance.

[0059] According to a battery cell cover provided by the present invention, a pole is riveted to a connecting hole on a rivet, so that an outwardly expanding bulging portion is formed on the pole; a preset length dimension of the rivet in a first direction is M; a preset width dimension of the rivet in a second direction is N; a radial dimension of a portion of the connecting hole for accommodating the bulging portion is d, and by limiting (Md) / (Nd)≤8, the circumferential edge of the rivet can be effectively prevented from warping, thereby solving the problem of excessive flatness after the rivet and the pole are assembled, thereby ensuring that the size and shape tolerances of the assembled pole meet the requirements, ensuring reliable riveting of the pole and the rivet, and improving the yield rate of the battery cell cover.

[0060] A battery cell provided according to the present invention includes the battery cell cover plate as described above. The rivets in the battery cell cover plate will not have abnormal flatness after installation, thereby improving the yield of the battery cell cover plate and the battery cell and ensuring the safety of the battery cell.

[0061] 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; A rivet is provided with a connecting hole, and one end of the pole extending out of the mounting hole is riveted to the connecting hole, so that part of the pole is formed into a swelling portion; the preset length dimension of the rivet in the first direction is M, in mm; the preset width dimension in the second direction is N, in mm; the radial dimension of the part of the connecting hole for accommodating the swelling portion is d, in mm; (Md) / (Nd)≤8.

2. The cell cover plate according to claim 1, characterized in that: The connecting hole is formed as a stepped hole having a first step section and a second step section, the radial dimension of the first step section is smaller than the radial dimension of the second step section, and the swelling portion is formed by expanding the circumferential side wall of the pole along the direction close to the hole wall of the second step section.

3. The cell cover plate according to claim 2, characterized in that: After riveting, the shortest distance between the second step section and the edge of the riveted part in the first direction is m, and the shortest distance between the second step section and the edge of the riveted part in the second direction is n, n≥2mm, m / n≤8.

4. The battery cover according to claim 2, characterized in that: The connecting hole has a third step section, the first step section, the second step section and the third step section are arranged sequentially along the axial direction of the connecting hole, and the radial dimension of the first step section is less than the radial dimension of the second step section and less than the radial dimension of the third step section.

5. The cell cover plate according to claim 1, characterized in that: After riveting, the actual maximum width dimension of the riveted part in the second direction is D, -0.2mm≤DN≤0.2mm.

6. The cell cover plate according to claim 1, characterized in that: The flatness tolerance of the upper surface of the rivet is less than or equal to 0.3 mm.

7. The cell cover plate according to claim 1, characterized in that: The rivet is formed into a rectangular block structure, the first direction is the length direction of the rivet, and the second direction is the width direction of the rivet.

8. The cell cover plate according to claim 1, characterized in that: The battery cover plate also includes: A first insulating member, sandwiched between the cover plate body and the riveted member, a portion of the first insulating member being disposed around a circumferential side wall of the riveted member; A second insulating member, sandwiched between the bottom plate of the pole and the cover plate body; A sealing member is sandwiched between the bottom plate and the cover plate body, and a portion of the sealing member is sandwiched between the mounting hole and the circumferential side wall of the pole.

9. The cell cover plate according to claim 1, characterized in that: The cover plate body is provided with a liquid injection hole and / or an exhaust hole communicating with the inside and outside of the battery core.

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

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