Cover plate assembly and battery cell

Abstract

A cover plate assembly and a battery cell. The cover plate assembly comprises a cover plate (1) and a post (2), the post (2) being mounted on the cover plate (1), and the size of the post (2) in the length direction of the cover plate (1) being greater than the size of the post (2) in the width direction of the cover plate (1). It can be seen that the size of the post (2) in the length direction of the cover plate (1) is greater than the size of the post (2) in the width direction of the cover plate (1), thereby adapting to the cover plate (1) having a length size greater than a width size. Moreover, in a limited cover plate space, increasing the size of the post (2) to improve the current flow-through capacity of the post (2) replaces double / multi-rivet solutions previously designed in order to increase the current flow-through capacity of the post, reducing costs. In addition, the lower surface of a riveting member (3) provided for the post (2) is provided with anti-deformation recesses (33), thereby improving the anti-deformation capability, and further improving the flatness of the riveted riveting member (3) and post (2). In addition, the post (2) is provided with a boss (224) protruding from the riveting member (3), so as to be conveniently to be positioned on an external busbar.

Description

Cover plate assembly and battery cell

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. CN202411455960.7, filed on October 18, 2024, entitled “Cover Assembly and Battery Cell”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Technology

[0004] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles. A lithium-ion battery is composed of lithium-ion cells, and the cell cover structure is a crucial component. This cover structure includes a cover plate, terminals, upper plastic, lower plastic, and riveting blocks. The terminals are cylindrical, while the cover plate is mostly rectangular, with its length significantly greater than its width. This means that the cylindrical terminals are limited by the width of the cover plate, preventing a larger diameter and consequently resulting in low current-carrying capacity.

[0005] Application content

[0006] In view of this, the purpose of this application is to provide a cover plate assembly and a battery cell, which to a certain extent solves the technical problem in the prior art where the electrode post is cylindrical and the cover plate is mostly rectangular, and its length dimension is much larger than its width dimension. In other words, the cylindrical electrode post is limited by the width of the cover plate, which prevents the diameter of the electrode post from being increased, resulting in a small current carrying capacity of the electrode post.

[0007] In a first aspect, this application provides a cover plate assembly, including a cover plate and a pole post; wherein the pole post is mounted on the cover plate, and the dimension of the pole post in the length direction of the cover plate is greater than the dimension of the pole post in the width direction of the cover plate.

[0008] Beneficial effects: In the cover plate assembly provided by this application, the dimension of the pole in the length direction of the cover plate is larger than the dimension of the pole in the width direction of the cover plate, thereby adapting to the cover plate with a length dimension larger than the width dimension. Moreover, in the limited cover plate space, the size of the pole is increased, thereby improving the current carrying capacity of the pole. Furthermore, it replaces the double / multiple rivet solution designed in the past to increase the current carrying capacity of the pole, greatly reducing the cost.

[0009] In one optional embodiment, the pole post includes a connecting portion and a column body; wherein, the cover plate has a mounting through hole, the column body is inserted into the mounting through hole, and one end of the column body extends to the inner side of the cover plate and is connected to the connecting portion, and the other end of the column body extends to the outer side of the cover plate.

[0010] The dimension of the connecting portion and at least one of the columns in the length direction of the cover plate is greater than its dimension in the width direction of the cover plate.

[0011] In one optional embodiment, the cover plate assembly further includes a riveting member and a first insulating member; wherein the riveting member and the first insulating member are both sleeved on the outside of the column, and the first insulating member separates the riveting member from the cover plate.

[0012] The column is riveted together with the riveting member, and after the riveting is completed, the column forms a boss exposed on the riveting member.

[0013] Beneficial effects: The pole post is provided with a boss structure that extends beyond the end face of the riveting component, which facilitates positioning with the external palladium sheet, improves assembly efficiency and assembly accuracy with the palladium sheet.

[0014] In one optional embodiment, the riveting member has a riveting hole and is fitted onto the outside of the column through the riveting hole. The opening end of the riveting hole away from the cover plate forms a first mounting slope that gradually widens outward. After the column is riveted to the riveting member, a second mounting slope that matches the first mounting slope is formed on the side wall of the end of the column away from the cover plate. Alternatively, a riveting groove is provided on the outer periphery of the opening end of the riveting hole away from the cover plate. After the column is riveted to the riveting member, an mounting protrusion that matches the riveting groove is formed on the side wall of the end of the column away from the cover plate.

[0015] In one optional embodiment, the minimum wall thickness of the riveting hole of the riveting member is e, and e ≥ 1.2 mm.

[0016] In one alternative embodiment, the riveting component is made of aluminum or copper.

[0017] In one alternative embodiment, an anti-deformation groove is formed on the side of the riveting member near the cover plate, and the anti-deformation groove extends along the length direction of the riveting member.

[0018] Beneficial effects: Anti-deformation grooves are opened on the lower surface of the riveting components provided with the pole post to improve the anti-deformation ability, thereby improving the flatness of the riveting components and the pole post after riveting.

[0019] In one optional embodiment, the maximum dimension of the anti-deformation groove in the length direction of the riveting member is a, the maximum dimension of the anti-deformation groove in the width direction of the riveting member is b, and a≥b.

[0020] In one optional embodiment, along the direction from the inside to the outside of the cover plate, the riveting member has an inner mating surface and an outer mating surface, both of which are parallel to the outer surface of the cover plate. The distance between the inner and outer mating surfaces is d, the depth of the anti-deformation groove is c, and 1.5mm≤d≤5mm, 0.2mm≤c≤1.5mm, and dc≥1mm.

[0021] In one optional embodiment, the number of the anti-deformation grooves is multiple, and they are arranged sequentially along the length direction of the riveting member.

[0022] In one alternative implementation, d = 3 mm and c = 0.5 mm.

[0023] In one alternative embodiment, the column includes a first column and a second column connected together, and in a direction from the inside of the cover plate toward its outside, the cross-sectional dimension of the first column is larger than that of the second column, so that a stepped surface is formed between them, and a portion of the riveting member is situated on the stepped surface.

[0024] In one alternative embodiment, the height of the boss exposed above the riveting member is f, and 0.2mm≤f≤3mm.

[0025] In one alternative implementation, 1mm ≤ f ≤ 1.5mm.

[0026] In one optional embodiment, the electrode post is made of copper-aluminum composite material, copper, or aluminum.

[0027] Secondly, this application provides a battery cell, which includes a housing, an electrode assembly, and the terminal posts described in any of the above technical solutions, wherein the electrode assembly is installed inside the housing, and the cover plate assembly is installed at at least one open end of the housing. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 is an exploded view of the cover plate assembly provided in an embodiment of this application;

[0030] Figure 2 is an assembly diagram of the pole provided in an embodiment of this application;

[0031] Figure 3 is a cross-sectional view along section AA in Figure 2;

[0032] Figure 4 is a schematic diagram of the pole column provided in an embodiment of this application;

[0033] Figure 5 is a schematic diagram of the structure after the pole post and the riveting component are riveted together according to an embodiment of this application;

[0034] Figure 6 is a structural schematic diagram of the riveting component provided in an embodiment of this application;

[0035] Figure 7 is another structural schematic diagram of the riveting component provided in an embodiment of this application;

[0036] Figure 8 is a sectional view along section BB of Figure 7;

[0037] Figure 9 is another structural schematic diagram of the riveting component provided in the embodiment of this application;

[0038] Figure 10 is a sectional view along section CC of Figure 9;

[0039] Figure 11 is another cross-sectional view of the riveting component provided in an embodiment of this application;

[0040] Figure 12 is another structural schematic diagram of the pole provided in an embodiment of this application.

[0041] Reference numerals: 1-Cover plate, 2-Pole post, 21-Connecting part, 22-Post, 221-First post, 222-Second post, 223-Step surface, 224-Boss, 225-Second assembly ramp, 226-Assembly protrusion, 3-Riveting component, 31-Riveting hole, 32-Riveting groove, 33-Anti-deformation groove, 34-First assembly ramp, 4-First insulating component, 5-Sealing ring, 6-Second insulating component. Detailed Implementation

[0042] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0043] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0044] The cover plate assembly and battery cell according to some embodiments of this application are described below with reference to Figures 1 to 12.

[0045] Example 1

[0046] Referring to Figures 1 to 5, an embodiment of this application provides a cover plate assembly, which includes a cover plate 1 and a pole post 2; wherein, the pole post 2 is installed on the cover plate 1, and the dimension of the pole post 2 in the length direction of the cover plate 1 is greater than the dimension of the pole post 2 in the width direction of the cover plate 1.

[0047] As can be seen from the structure described above, the dimension of the pole post 2 in the length direction of the cover plate 1 is larger than the dimension of the pole post 2 in the width direction of the cover plate 1, thus adapting to the cover plate 1 whose length dimension is larger than its width dimension. Moreover, within the limited space of the cover plate 1, the size of the pole post 2 is increased, thereby improving the flow capacity of the pole post 2. Furthermore, it replaces the double / multiple rivet scheme designed in the past to increase the flow capacity of the pole post 2, greatly reducing the cost.

[0048] In this embodiment, preferably as shown in Figures 3 to 5, the pole post 2 includes a connecting part 21 and a post body 22; wherein, the cover plate 1 is formed with a mounting through hole, the post body 22 is inserted into the mounting through hole, and one end of the post body 22 extends to the inner side of the cover plate 1 and is connected to the connecting part 21, and the other end of the post body 22 extends to the outer side of the cover plate 1.

[0049] The dimensions of the connecting part 21 and the column 22 in the length direction of the cover plate 1 are larger than the dimensions of the corresponding connecting part 21 and the column 22 in the width direction of the cover plate 1.

[0050] As can be seen from the structure described above, the pole post 2 is designed in two parts, namely the connecting part 21 and the column 22. The connecting part 21 is easy to weld to the flattened electrode lug of the electrode assembly, thereby eliminating the structure of the connecting piece and helping to reduce costs. Moreover, the contact area between the connecting part 21 and the electrode lug is large, which improves the strength and stability of the welding. Furthermore, the dimension of the connecting part 21 in the length direction of the cover plate 1 is larger than the dimension of the connecting part 21 in the width direction of the cover plate 1, thus adapting to the shell where the length dimension is larger than the width dimension. That is, within the limited shell space, the size of the pole post 2 is increased, which improves the current carrying capacity and the stability and strength of the welding with the electrode lug of the electrode assembly. At the same time, the dimension of the column 22 in the length direction of the cover plate 1 is larger than the dimension of the column 22 in the width direction of the cover plate 1. Moreover, within the limited space of the cover plate 1, the size of the pole post 2 is increased, thereby improving the current carrying capacity of the pole post 2.

[0051] It should be noted that, not only is it true that the dimension of the column 22 in the length direction of the cover plate 1 is greater than the dimension of the column 22 in the width direction of the cover plate 1, but the dimension of the connecting part 21 in the length direction of the cover plate 1 must also be greater than the dimension of the connecting part 21 in the width direction of the cover plate 1. Alternatively, the dimension of the connecting part 21 in the length direction of the cover plate 1 can be designed to be smaller than the dimension of the connecting part 21 in the width direction of the cover plate 1, depending on the actual needs.

[0052] Furthermore, preferably, the column 22 can be in the shape of a racetrack. Of course, it is not limited to this. The column 22 can also be designed in different shapes according to actual needs, such as a long strip or an oval shape, etc. The specific shape can be selected according to actual needs.

[0053] Furthermore, preferably, the connecting part 21 is a rectangular plate, which has sufficient contact area with the electrode lugs of the electrode assembly, improving the stability and firmness of the welding, and the flatness is beneficial to the welding.

[0054] In this embodiment, preferably as shown in Figures 1 to 5, the cover plate assembly further includes a riveting member 3 and a first insulating member 4; wherein the riveting member 3 and the first insulating member 4 are both sleeved on the outside of the column 22, and the first insulating member 4 separates the riveting member 3 from the cover plate 1, thereby playing a role in insulation and protection.

[0055] The column 22 is riveted together with the riveting member 3, and after the riveting is completed, the column 22 forms a boss 224 exposed on the riveting member 3.

[0056] As can be seen from the structure described above, the riveting component 3 and the first insulating component 4 are both sleeved on the outside of the pole post 2. The riveting component 3 is riveted together with the pole post 2 to fix the pole post 2, and at the same time, it presses the first insulating component 4 to fix the first insulating component 4, making the assembled structure more stable and firm. Moreover, the boss 224 is exposed on the riveting component 3, which facilitates the assembly and positioning with the palladium sheet, improves the assembly effect, and helps to improve the assembly with the palladium sheet.

[0057] Furthermore, preferably, the riveting member 3 is a cuboid structure, with its length direction being the same as the length direction of the cover plate 1, and its width direction being the same as the width direction of the cover plate 1. Of course, it is not limited to this; the riveting member 3 can also be a cube structure, a cylinder structure, or a polygonal or irregularly shaped block, etc.

[0058] Furthermore, preferably, the first insulating member 4 is grooved, and the riveting member 3 can be placed in its groove to improve the insulation effect.

[0059] In this embodiment, preferably as shown in Figures 7 and 8, the riveting member 3 is formed with a riveting hole 31, and the riveting member 3 is sleeved on the outside of the column 22 through the riveting hole 31. The opening end of the riveting hole 31 away from the cover plate 1 forms a first mounting slope 34 that gradually expands outward. After the column 22 is riveted to the riveting member 3, a second mounting slope 225 that matches the first mounting slope 34 is formed on the side wall of the end of the column 22 away from the cover plate 1.

[0060] As can be seen from the structure described above, a gradually expanding first assembly slope 34 is machined at the opening end of the riveting hole 31 on the side away from the cover plate 1. When the column 22 and the riveting component 3 are riveted by the punch, the punch also presses the end of the column 22 away from the cover plate 1 to deform along with the opening end of the aforementioned riveting hole 31, thereby forming a hook part at the end of the riveted column 22, that is, forming a second assembly slope 225. The hook is on the riveting component 3, thereby making the riveting component 3 and the pole post 2 stably and firmly connected together.

[0061] Of course, it is not limited to the above structure. Other structures can also be used. For example, as shown in Figures 11 and 12, a riveting groove 32 is provided on the outer periphery of the opening end of the riveting hole 31 on the side away from the cover plate 1. After the column 22 is riveted to the riveting component 3, an assembly protrusion 226 that matches the riveting groove 32 is formed on the side wall of the end of the column 22 away from the cover plate 1, so that the column 22 and the riveting component 3 are more firmly and stably riveted.

[0062] In this embodiment, preferably, as shown in Figures 6 to 8, an anti-deformation groove 33 is formed on the side of the riveting member 3 near the cover plate 1, and the anti-deformation groove 33 extends along the length direction of the riveting member 3.

[0063] As can be seen from the structure described above, an anti-deformation groove 33 is opened on the side of the riveting component 3 near the cover plate 1. When the pole post 2 is riveted, the problem of the riveting component 3 lifting and the problem of non-flatness are avoided. The problem of false welding and explosion points are avoided when the external palladium sheet is welded to the pole post 2, which greatly improves the welding quality.

[0064] Furthermore, preferably, there are two anti-deformation grooves 33, arranged sequentially along the length of the riveting member 3. Preferably, one anti-deformation groove 33 is provided on each side of the pole post 2 along the length of the riveting member 3, thereby improving the overall anti-deformation capability. Of course, the number of anti-deformation grooves 33 is not limited to two, but can also be one. Furthermore, it is not limited to providing one anti-deformation groove 33 on each side of the pole post 2, but can also provide an anti-deformation groove 33 on only one side of the pole post 2. Moreover, when anti-deformation grooves 33 are provided on both sides of the pole post 2, the number of anti-deformation grooves 33 on each side of the pole post 2 is not limited to one, but can also be two or three, etc., depending on the actual needs.

[0065] In this embodiment, preferably, as shown in FIG6, the maximum dimension of the anti-deformation groove 33 in the length direction of the riveting member 3 is a, the maximum dimension of the anti-deformation groove 33 in the width direction of the riveting member 3 is b, and a≥b.

[0066] As can be seen from the structure described above, the maximum dimension of the anti-deformation groove 33 in the length direction of the riveting member 3 is designed to be greater than the maximum dimension of the anti-deformation groove 33 in the width direction of the riveting member 3, thereby ensuring the flatness of the riveting member 3 in the length direction and ensuring the welding yield of the palladium sheet.

[0067] Furthermore, in order to obtain the above relationship, multiple sets of experiments were conducted. Preferably, when the thickness d of the riveting component 3 and the depth c of the anti-deformation groove 33 are respectively taken as d = 3 mm and c = 0.5 mm, the length a, width b of the anti-deformation groove 33 and the flatness of the pole post 2 after riveting with the riveting component 3 were tested in multiple sets of experiments, and the test results are listed below:

[0068] Table 1 shows the relationship between the length a and width b of the anti-deformation groove 33 and the flatness of the pole post 2 and the riveting component 3 after riveting.

[0069] As can be seen from the comparison of the above experimental examples and comparative examples, it can be further concluded that only when a≥b can the flatness of the riveted component 3 and the pole post 2 be guaranteed after welding, thus ensuring the welding yield of the palladium sheet.

[0070] In this embodiment, preferably, as shown in FIG8, along the direction from the inner side of the cover plate 1 to its outer side, the riveting member 3 is formed with an inner mating surface and an outer mating surface, and both the inner mating surface and the outer mating surface are parallel to the outer surface of the cover plate 1. The distance between the inner mating surface and the outer mating surface is d, the depth of the anti-deformation groove 33 is c, and 1.5mm≤d≤5mm, 0.2mm≤c≤1.5mm, dc≥1mm.

[0071] Based on the structure described above, c is the depth of the anti-deformation groove 33, and 0.2mm≤c≤1.5mm. The anti-deformation groove 33 needs to have a certain depth to ensure the anti-deformation ability of the riveting component 3. However, if it is too deep, it will cause the palladium sheet to penetrate when welding with the riveting component 3. It is preferably 0.5mm. d is the thickness of the riveting component 3, and 1.5mm≤d≤5mm. It ensures the strength of the riveting component 3, and is preferably 3mm, which takes into account the cost. dc≥1mm, to avoid the penetration of the riveting component 3 when welding the palladium sheet on the upper surface of the riveting component 3, which would burn the plastic.

[0072] In this embodiment, preferably as shown in Figures 3 to 5, the column 22 includes a first column 221 and a second column 222 connected to each other, and along the direction from the inside of the cover plate 1 to its outside, the cross-sectional dimension of the first column 221 is larger than the cross-sectional dimension of the second column 222, so that a stepped surface 223 is formed between the two, and part of the structure of the riveting member 3 is located on the stepped surface 223.

[0073] As can be seen from the structure described above, part of the structure of the riveting component 3 is located on the step surface 223, which supports the riveting component 3, reduces the force on the cover plate 1 during riveting, and protects the cover plate 1. In particular, when the riveting component 3 is riveted to the pole post 2, the pole post 2 and the riveting component 3 are interlocked, which improves the stability and firmness of the assembly of the riveting component 3 and the pole post 2.

[0074] Of course, it is not limited to this. Along the inner side of the cover plate 1 towards its outer side, the pole post 2 can also be of the same thickness from top to bottom, depending on the actual needs.

[0075] In this embodiment, preferably, as shown in FIG3, the height of the boss 224 exposed above the riveting member 3 along the thickness direction of the cover plate 1 is f, and 0.2mm≤f≤3mm.

[0076] Based on the structure described above, it can be seen that the size of the exposed riveting component 3 of the boss 224 is too small, i.e. too low, making it inconvenient to weld with the palladium sheet. The size of the exposed riveting component 3 of the boss 224 is too small, i.e. too high, occupying a large amount of internal space in the battery and easily interfering with other components. Therefore, 0.2mm≤f≤3mm is set.

[0077] Furthermore, preferably, 1mm≤f≤1.5mm.

[0078] As can be seen from the structure described above, the thickness of existing palladium sheets is generally 1mm to 1.5mm. Therefore, the height of the boss 224 that protrudes above the surface of the riveting component 3 is preferably 1mm to 1.5mm, which can better position the palladium sheet.

[0079] In this embodiment, preferably, as shown in Figures 9 and 10, the minimum wall thickness of the riveting hole 31 of the riveting member 3 is e, and e ≥ 1.2 mm.

[0080] Based on the structure described above, if the minimum wall thickness of the rivet hole 31 of the riveting component 3 is too small, it will result in a weaker area. Therefore, e ≥ 1.2 mm.

[0081] In order to obtain the above relationship, multiple sets of experiments were conducted to compare and analyze the minimum wall thickness e of the riveting hole 31 of the riveting component 3 and the material expansion of the riveting component 3. The experimental results are listed below:

[0082] Table 2. Relationship between the value of e, the expansion of riveted component 3, and whether or not the dimensions are out of tolerance.

[0083] As can be seen from the comparison of the above experimental examples and comparative examples, it can be further concluded that only when e≥1.2mm can it be guaranteed that the riveted component 3 will not have material expansion and the dimensions will not exceed the tolerance.

[0084] In this embodiment, preferably, the riveting component 3 is made of aluminum or copper.

[0085] Furthermore, preferably, when this cover plate assembly is used as a negative electrode cover plate 1, the material of the riveting member 3 can be selected as copper-aluminum alloy or copper; when this cover plate assembly is used as a positive electrode cover plate 1, the material of the riveting member 3 can be selected as aluminum.

[0086] In this embodiment, preferably, the pole 2 is made of copper-aluminum composite material, copper material, or aluminum material.

[0087] Furthermore, preferably, when this cover plate assembly is used as the negative electrode cover plate 1, the electrode post 2 can be made of aluminum or copper-aluminum composite material; when this cover plate assembly is used as the positive electrode cover plate 1, the electrode post 2 can be made of aluminum.

[0088] In this embodiment, preferably, the first insulating member 4 is made of PPS (polyphenylene sulfide), mainly serving to insulate the riveting member 3 from the cover plate 1. Specifically, when the cover plate assembly is used as a positive electrode cover, the resistance value of the first insulating member 4 meets the requirement of 5Ω to 100000Ω or >200MΩ; when the cover plate assembly is used as a negative electrode cover, the resistance of the first insulating member 4 meets the requirement of >200MΩ. Of course, this is not the only limitation; it can be designed according to actual needs.

[0089] It should be noted that in this embodiment, only one pole post 2 is provided in the cover plate assembly. Of course, it is not limited to this; two pole posts 2 can also be provided, and each pole post 2 is equipped with the aforementioned riveting component 3 and first insulating component 4, etc. In addition, as shown in Figures 1 and 3, the cover plate assembly in this embodiment also includes a sealing ring 5 and a second insulating component 6, such as the following plastic structure, which are all existing structures and will not be described in detail here.

[0090] Example 2

[0091] Embodiment 2 of this application also provides a battery cell, including the terminal post 2 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the terminal post 2. The same technical features and beneficial effects will not be repeated here.

[0092] In this embodiment, preferably, the battery cell further includes a housing and an electrode assembly; wherein the electrode assembly is installed inside the housing, and a cover plate assembly is installed at least one open end of the housing, that is, the cover plate assembly is provided at only one end of the housing, or the cover plate assembly is provided at both ends of the housing, depending on the actual needs.

[0093] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents. Industrial applicability

[0094] In the cover plate assembly provided in this application, the dimension of the pole in the length direction of the cover plate is larger than the dimension of the pole in the width direction of the cover plate, thereby adapting to cover plates with a length dimension larger than a width dimension. Moreover, by increasing the size of the pole in the limited cover plate space, the current carrying capacity of the pole is improved. Furthermore, it replaces the double / multiple rivet solution designed in the past to increase the current carrying capacity of the pole, which greatly reduces the cost.

Claims

1. A cover assembly, characterized by It includes a cover plate and an electrode post; wherein the electrode post is mounted on the cover plate, and the dimension of the electrode post in the length direction of the cover plate is greater than the dimension of the electrode post in the width direction of the cover plate; The pole includes a connecting part and a column; wherein, the cover plate has a mounting through hole, the column is inserted into the mounting through hole, and one end of the column extends to the inside of the cover plate and is connected to the connecting part, and the other end of the column extends to the outside of the cover plate. The dimension of the connecting portion and at least one of the columns in the length direction of the cover plate is greater than its dimension in the width direction of the cover plate; The cover plate assembly further includes a riveting member and a first insulating member; wherein the riveting member and the first insulating member are both sleeved on the outer periphery of the column, and the first insulating member separates the riveting member from the cover plate; The column is riveted together with the riveting member, and after the riveting is completed, the column forms a boss exposed on the riveting member; The riveting member has a riveting hole and is fitted onto the outside of the column through the riveting hole. The opening end of the riveting hole away from the cover plate forms a first mounting slope that gradually widens outward. After the column is riveted to the riveting member, a second mounting slope that matches the first mounting slope is formed on the side wall of the end of the column away from the cover plate. Alternatively, a riveting groove is provided on the outer periphery of the opening end of the riveting hole away from the cover plate. After the column is riveted to the riveting member, an mounting protrusion that matches the riveting groove is formed on the side wall of the end of the column away from the cover plate.

2. The cover plate assembly of claim 1, wherein, The minimum wall thickness of the riveting hole in the riveting component is e, and e ≥ 1.2 mm; and / or The riveting components are made of aluminum or copper.

3. The cover plate assembly of claim 1, wherein, An anti-deformation groove is formed on the side of the riveting member near the cover plate, and the anti-deformation groove extends along the length direction of the riveting member.

4. The cover plate assembly of claim 3, wherein, The maximum dimension of the anti-deformation groove in the length direction of the riveting member is a, and the maximum dimension of the anti-deformation groove in the width direction of the riveting member is b, and a≥b.

5. The cover plate assembly of claim 3, wherein, Along the direction from the inner side of the cover plate to its outer side, the riveting member has an inner mating surface and an outer mating surface, both of which are parallel to the outer surface of the cover plate. The distance between the inner and outer mating surfaces is d, the depth of the anti-deformation groove is c, and 1.5mm≤d≤5mm, 0.2mm≤c≤1.5mm, dc≥1mm; and / or The number of anti-deformation grooves is multiple, and they are arranged sequentially along the length direction of the riveting member.

6. The cover plate assembly of claim 5, wherein, d = 3mm, c = 0.5mm.

7. The cover plate assembly of claim 1, wherein, The column includes a first column and a second column connected together, and is oriented from the inside of the cover plate toward its outside. The cross-sectional dimension of the first column is larger than that of the second column, so that a stepped surface is formed between them, and a portion of the riveting member is situated on the stepped surface.

8. The cover plate assembly of claim 1, wherein, The height of the boss exposed above the riveting member is f, and 0.2mm≤f≤3mm.

9. The cover plate assembly of claim 8, wherein, 1mm≤f≤1.5mm.

10. The cover plate assembly of any one of claims 1 to 9, wherein, The electrode post is made of copper-aluminum composite material, copper, or aluminum.

11. An electric cell characterized by It includes a housing, an electrode assembly, and a cover plate assembly as described in any one of claims 1 to 10; wherein the electrode assembly is installed within the housing, and the cover plate assembly is installed at at least one open end of the housing.

Images