Cover plate assembly and battery cell

Abstract

The utility model discloses a cover plate assembly and a battery monomer, the cover plate assembly is used for the battery monomer, and the cover plate assembly comprises: a cover body provided with a mounting hole; the pole is arranged in the mounting hole in a penetrating manner; the welding block is arranged on the pole in a sleeving mode and located on the side, close to the pole group of the battery single body, of the cover body, and the end, close to the pole group, of the pole is bent towards the side close to the welding block so as to be connected with the welding block. According to the cover plate assembly disclosed by the utility model, the welding block is sleeved on the pole column and is positioned on one side of the cover body close to the pole group of the single battery, and one end of the pole column close to the pole group is bent towards one side close to the welding block so as to be connected with the welding block, so that the end of the pole column close to the pole group is conveniently connected with the welding block; reliable connection between the pole and the welding block is ensured, the pole is reliably fixed on the cover body, connection between the pole and the pole group is ensured, and the pole is simple in structure and convenient to process, manufacture and assemble.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field more particularly, relate to a cover plate subassembly and battery monomer. BACKGROUND

[0002] In the related art, the connection between the pole and the welding block is unreliable, which makes the pole fixed on the cover body unreliable and prone to loosening and other problems, and the structure of the pole is complex, increasing the production cost. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, one purpose of the utility model is to provide a cover plate subassembly, which can ensure reliable fixation of the pole and has a simple structure, facilitating manufacturing and assembly.

[0004] Another purpose of the utility model is to provide a battery monomer with the above-mentioned cover plate subassembly.

[0005] The cover plate subassembly according to the utility model embodiment is used for a battery monomer and comprises a cover body provided with a mounting hole, a pole arranged in the mounting hole, and a welding block arranged on the pole and located on the side of the cover body close to a pole group of the battery monomer. One end of the pole close to the pole group is bent towards the side close to the welding block to be connected with the welding block.

[0006] The cover plate subassembly according to the utility model embodiment has the welding block arranged on the pole and located on the side of the cover body close to the pole group of the battery monomer, and one end of the pole close to the pole group is bent towards the side close to the welding block to be connected with the welding block. This facilitates the connection between one end of the pole close to the pole group and the welding block, ensures reliable connection between the pole and the welding block, makes the pole fixed on the cover body reliably, guarantees the connection between the pole and the pole group, and has a simple structure, facilitating processing, manufacturing, and assembly.

[0007] In addition, the cover plate subassembly according to the above-mentioned utility model embodiment can have the following additional technical features:

[0008] According to the cover plate subassembly of some embodiments of the utility model, the bending angle of one end of the pole close to the pole group is 25°-65°.

[0009] According to some embodiments of the utility model, the pole comprises a body part arranged in the mounting hole and extending out of the mounting hole towards the side away from the pole group, and a connecting part formed in a ring shape and connected with one end of the body part close to the pole group. One end of the connecting part close to the pole group is bent towards the side close to the welding block to be connected with the welding block.

[0010] According to some embodiments of the present application, the end face of the body part close to the connecting part is provided with a groove recessed towards the direction away from the connecting part.

[0011] According to some embodiments of the present application, the cover plate assembly further comprises a sealing member, which is sleeved on the connecting part and located on the side of the welding block away from the pole group, the radially inner side of the sealing member abuts against the body part, and the radially outer side of the sealing member abuts against the cover body.

[0012] According to some embodiments of the present application, the end of the body part close to the connecting part and the end of the cover body close to the pole group are flush.

[0013] According to some embodiments of the present application, the wall thickness of the connecting part is greater than or equal to 1.0 mm.

[0014] According to some embodiments of the present application, the welding block is provided with a through hole for avoiding the pole column, the end face of the welding block close to the pole group is provided with an avoiding groove arranged around the through hole, and the end of the pole column close to the pole group is located on the side of the avoiding groove away from the pole group.

[0015] According to some embodiments of the present application, the end of the pole column away from the pole group is provided with a protruding part extending along the circumferential direction of the pole column, and the thickness of the protruding part is greater than or equal to 0.8 mm.

[0016] The battery cell according to the embodiments of the present application comprises: a shell, which is open on one side to form an opening; a pole group, which is arranged in the shell; a cover plate assembly according to the embodiments of the present application, wherein the cover body is arranged on the opening, and the welding block is located on the side of the cover body close to the pole group.

[0017] According to the embodiments of the present application, the welding block is sleeved on the pole column and located on the side of the cover body close to the pole group of the battery cell, the end of the pole column close to the pole group is bent towards the side close to the welding block to be connected with the welding block, which facilitates the connection of the end of the pole column close to the pole group with the welding block, ensures the reliable connection of the pole column with the welding block, makes the fixation of the pole column on the cover body reliable, guarantees the connection of the pole column with the pole group, and the structure of the pole column is simple, facilitating the processing, manufacturing and assembly.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, some of which will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0020] Figure 1 is a structural schematic view of a battery monomer according to the embodiment of the present utility model;

[0021] Figure 2 is a top view of the battery monomer according to the embodiment of the present utility model;

[0022] Figure 3 is Figure 2 the cross section view along the direction indicated by A-A line;

[0023] Figure 4 is Figure 2 the cross section view along the direction indicated by B-B line;

[0024] Figure 5 is Figure 4 the enlarged structural schematic view at C in the middle circle;

[0025] Figure 6 is a structural schematic view of a cover plate assembly according to the embodiment of the present utility model;

[0026] Figure 7 is a top view of the cover plate assembly according to the embodiment of the present utility model;

[0027] Figure 8 is Figure 7 the cross section view along the direction indicated by D-D line;

[0028] Figure 9 is a bottom view of the cover plate assembly according to the embodiment of the present utility model;

[0029] Figure 10 is a structural schematic view of one angle of the pole post of the cover plate assembly according to the embodiment of the present utility model, wherein the connecting part is not bent;

[0030] Figure 11 is a left view of the pole post of the cover plate assembly according to the embodiment of the present utility model, wherein the connecting part is not bent;

[0031] Figure 12 is a top view of the pole post of the cover plate assembly according to the embodiment of the present utility model, wherein the connecting part is not bent;

[0032] Figure 13 is Figure 12 the cross section view along the direction indicated by E-E line;

[0033] Figure 14 is a bottom view of the pole post of the cover plate assembly according to the embodiment of the present utility model, wherein the connecting part is not bent;

[0034] Figure 15 is another angle structural schematic view of the pole of the cover plate assembly according to an embodiment of the present application, wherein the connecting part is not bent;

[0035] Figure 16 is one angle structural schematic view of the pole of the cover plate assembly according to an embodiment of the present application, wherein the connecting part is bent;

[0036] Figure 17 is a left view of the pole of the cover plate assembly according to an embodiment of the present application, wherein the connecting part is bent;

[0037] Figure 18 is another angle structural schematic view of the pole of the cover plate assembly according to an embodiment of the present application, wherein the connecting part is bent.

[0038] Reference signs:

[0039] 100, cover plate assembly; 200, battery monomer;

[0040] 10, cover body; 11, mounting hole;

[0041] 20, pole; 21, body part; 22, connecting part; 23, protruding part; 211, groove;

[0042] 30, welding block; 31, through hole; 32, avoiding slot;

[0043] 40, sealing member; 41, first sealing part; 42, second sealing part;

[0044] 51, shell; 52, pole group; 511, opening;

[0045] 61, connecting member; 62, upper plastic. DETAILED DESCRIPTION

[0046] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0047] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0048] In the description of the utility model, "first feature" and "second feature" can include one or more features, and "multiple" means two or more than two, and "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "above" and "above" the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0049] The cover plate assembly 100 according to the embodiment of the utility model is described below with reference to the drawings.

[0050] Referring to Figures 1-9 According to the embodiment of the utility model, the battery monomer 200 includes a shell 51, a pole group 52 and a cover plate assembly 100 according to the embodiment of the utility model, one side of the shell 51 is open to form an opening 511, and the pole group 52 is arranged in the shell 51. The cover plate assembly 100 according to the embodiment of the utility model is used for the battery monomer 200, and the cover plate assembly 100 includes a cover body 10, a pole 20 and a welding block 30. Among them, the battery monomer 200 can be a square battery.

[0051] Specifically, the cover body 10 is arranged on the opening 511, the pole group 52 can be protected by the shell 51 and the cover body 10, damage caused by the exposure of the pole group 52 is avoided, the service life of the pole group 52 is prolonged, and the pole group 52 is installed through the opening 511, which is beneficial to improve the assembly efficiency of the battery monomer 200. For example, the cover body 10 can be an aluminum plate or the like.

[0052] In addition, as Figure 5 , Figure 7 , Figures 16-18 As shown in the figure, the cover body 10 is provided with a mounting hole 11, the pole 20 is arranged in the mounting hole 11, the welding block 30 is arranged on the pole 20, and the welding block 30 is located on the side of the cover body 10 close to the pole group 52 (for example Figure 5the end of the pole column 20 close to the pole group 52 (for example Figure 5 The end of the pole column 20 close to the pole group 52 is bent towards the side close to the welding block 30, which facilitates the connection of the end of the pole column 20 close to the pole group 52 with the welding block 30, can provide a support stress point, ensures the reliable connection of the pole column 20 with the welding block 30, thereby ensuring the reliable fixation of the pole column 20 on the cover body 10, guarantees the connection of the pole column 20 with the pole group 52, and makes the structure of the pole column 20 simple, facilitating the processing, manufacturing and assembly, and can reduce the production cost. For example, the end of the pole column 20 close to the pole group 52 is welded with the welding block 30.

[0053] It can be understood that the "pole column 20" herein can be at least one of the positive pole column and the negative pole column of the battery monomer 200.

[0054] It should be noted that, for the convenience of description, the "front", "rear", "upper" and "lower" directions in the utility model are based on the orientation relationship shown in the drawings, and are not limited to the orientation in the actual application process.

[0055] According to the cover plate assembly 100 of the embodiment of the utility model, the welding block 30 is sleeved on the pole column 20 and located on the side of the cover body 10 close to the pole group 52 of the battery monomer 200, and the end of the pole column 20 close to the pole group 52 is bent towards the side close to the welding block 30 to be connected with the welding block 30, which facilitates the connection of the end of the pole column 20 close to the pole group 52 with the welding block 30, ensures the reliable connection of the pole column 20 with the welding block 30, makes the pole column 20 fixed reliably on the cover body 10, guarantees the connection of the pole column 20 with the pole group 52, and the structure of the pole column 20 is simple, facilitating the processing, manufacturing and assembly.

[0056] Since the cover plate assembly 100 according to the embodiment of the utility model has the above beneficial technical effects, the battery monomer 200 according to the embodiment of the utility model, the welding block 30 is sleeved on the pole column 20 and located on the side of the cover body 10 close to the pole group 52 of the battery monomer 200, and the end of the pole column 20 close to the pole group 52 is bent towards the side close to the welding block 30 to be connected with the welding block 30, which facilitates the connection of the end of the pole column 20 close to the pole group 52 with the welding block 30, ensures the reliable connection of the pole column 20 with the welding block 30, makes the pole column 20 fixed reliably on the cover body 10, guarantees the connection of the pole column 20 with the pole group 52, and the structure of the pole column 20 is simple, facilitating the processing, manufacturing and assembly.

[0057] In some embodiments of the utility model, for example, Figure 5As shown, the bending angle of the end of the pole column 20 close to the pole group 52 is 25°-65°, that is, the bending angle of the end of the pole column 20 close to the pole group 52 is α and satisfies 25°≤α≤65°. Within the above range, the connection effect of the welding block 30 and the pole column 20 can be ensured, the connection reliability is ensured, and the bending difficulty of the end of the pole column 20 close to the pole group 52 is reduced, facilitating assembly, while avoiding problems such as fracture or poor connection of the pole column 20 caused by excessive bending. For example, in some specific embodiments, the bending angle of the end of the pole column 20 close to the pole group 52 can be 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0058] According to some embodiments of the present application, Figure 5 , Figures 10-18 As shown, the pole column 20 includes a body portion 21, the body portion 21 is provided in the mounting hole 11, and the body portion 21 extends out of the mounting hole 11 towards the side away from the pole group 52 (for example, the upper side as shown in Figure 5 The connection requirement of the pole column 20 and the external structure can be met, thereby realizing the connection requirement of the battery monomer 200.

[0059] In addition, as shown in Figure 5 , Figure 11 , Figures 13-18 The pole column 20 further includes a connecting portion 22, the connecting portion 22 is formed in a ring shape, and the connecting portion 22 is connected to the end (for example, the lower end as shown in Figure 5 The end of the connecting portion 22 close to the pole group 52 is bent towards the side close to the welding block 30, so that the connecting portion 22 can be connected to the welding block 30, ensuring reliable connection, and the connecting portion 22 is formed in a ring shape, facilitating bending, so that the structure is simple, while the weight of the pole column 20 can be reduced, which is beneficial to reduce production cost.

[0060] In some embodiments of the present application, as shown in Figure 5 , Figures 13-15 , Figure 18 The end surface (for example, the lower end surface as shown in Figure 5 ) of the body portion 21 close to the connecting portion 22 is provided with a groove 211, the groove 211 is recessed towards the direction away from the connecting portion 22 (for example, the upper direction as shown in Figure 5 ), which can reduce the weight of the pole column 20, thereby reducing the weight of the cover plate assembly 100, so as to reduce the weight of the battery monomer 200, facilitating the lightweight design of the battery monomer 200, and reducing production cost.

[0061] In some embodiments, as shown in Figure 4 and Figure 5As shown, the pole groups 52 are two, and the two pole groups 52 are arranged in a thickness direction (for example Figure 4 the front-to-back direction shown in the middle) of the first pole group 52. By locating the two pole groups 52 in the shell 51, the capacity of a single battery monomer 200 can be improved, the use of the shell 51 can be reduced, the production cost can be reduced, and the volume utilization rate of the battery monomer 200 can be improved.

[0062] In addition, as shown, Figure 5 the cover plate assembly 100 further comprises a connecting piece 61, both ends of the connecting piece 61 in the length direction are connected to the two pole groups 52 respectively, and the middle part of the connecting piece 61 protrudes towards the side close to the pole 20, so that the connecting piece 61 can be connected with the groove bottom wall of the groove 211, and the connection requirement of the pole group 52 and the pole 20 can be met, the connection and positioning can be ensured to be reliable, the structure is compact, and the occupied space can be reduced. For example, the connecting piece 61 and the pole 20 are welded.

[0063] In some embodiments, as shown, Figure 13 the distance between the side wall of the groove 211 and the outer peripheral wall of the body part 21 is greater than or equal to 1.8 mm, that is, the distance L1 between the side wall of the groove 211 and the outer peripheral wall of the body part 21 satisfies L1≥1.8 mm. Within the above size range, the structural strength of the body part 21 can be ensured, and problems such as deformation can be avoided, so that the structural strength of the pole 20 can be ensured. For example, in some specific embodiments, the distance between the side wall of the groove 211 and the outer peripheral wall of the body part 21 can be 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, etc.

[0064] In some embodiments, as shown, Figure 13 the distance between the groove bottom wall of the groove 211 and the end face of the body part 21 away from the connecting part 22 is greater than or equal to 2.0 mm, that is, the distance L2 between the groove bottom wall of the groove 211 and the end face of the body part 21 away from the connecting part 22 satisfies L2≥2.0 mm. Within the above size range, the structural strength of the body part 21 can be ensured, and problems such as deformation can be avoided, so that the structural strength of the pole 20 can be ensured, for example, the welding strength of the pole 20 and the busbar can be ensured. For example, in some specific embodiments, the distance between the groove bottom wall of the groove 211 and the end face of the body part 21 away from the connecting part 22 can be 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, etc.

[0065] According to some embodiments of the present application, as shown, Figure 5 the cover plate assembly 100 further comprises a sealing piece 40, the sealing piece 40 is sleeved on the connecting part 22, and the sealing piece 40 is located on the side of the welding block 30 away from the pole group 52 (for example Figure 5As shown in the upper part, the radial inner side of the seal 40 abuts against the body part 21, which can achieve a seal between the pole post 20 and the welding block 30. The radial outer side of the seal 40 abuts against the cover body 10, which can achieve a seal between the cover body 10 and the welding block 30. This ensures a reliable seal at the mounting hole 11, prevents the electrolyte or other chemicals inside the battery cell 200 from leaking to the outside, and ensures the safety of the battery cell 200.

[0066] In some embodiments, such as Figure 5 As shown, the seal 40 includes a first sealing portion 41 and a second sealing portion 42. The first sealing portion 41 is formed in an annular shape, and one end of the second sealing portion 42 is connected to the end of the first sealing portion 41 that is away from the electrode assembly 52 (e.g., Figure 5 The upper end of the second sealing part 42 is connected to the first sealing part 41. The other end of the second sealing part 42 extends toward the side away from the first sealing part 41 and along the radial direction of the first sealing part 41. The second sealing part 42 is located between the cover body 10 and the body part 21, which can realize the sealing between the cover body 10 and the pole post 20, ensure the sealing reliability at the mounting hole 11, ensure the safety of the battery cell 200, and the structure of the sealing part 40 is simple and easy to process and manufacture.

[0067] In some embodiments, along the axial direction of the pole post 20 (e.g. Figure 5 As shown in the vertical direction, the length of the connecting portion 22 is greater than or equal to 1.1 mm, that is, along the axial direction of the pole post 20, the length of the connecting portion 22 is L3 and satisfies L3≥1.1 mm. Within the above-mentioned size range, the structural strength of the connecting portion 22 can be ensured, avoiding problems such as deformation, thereby ensuring the connection strength between the connecting portion 22 and the welding block 30, while ensuring that the sealing element 40 has sufficient compression to ensure reliable sealing. For example, in some specific embodiments, the length of the connecting portion 22 along the axial direction of the pole post 20 can be 1.1 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, etc.

[0068] In some embodiments, such as Figure 5 As shown, the thickness of the welding block 30 is greater than or equal to 0.8 mm, that is, the thickness of the welding block 30 is W4 and satisfies W4≥0.8 mm. Along the axial direction of the welding block 30 (e.g.) Figure 5As shown in the vertical direction, the length of the through hole 31 is greater than or equal to 0.2 mm, that is, along the axial direction of the welded block 30, the length of the through hole 31 is L4 and satisfies L4≥0.2 mm. Within the above-mentioned size range, the structural strength of the welded block 30 can be ensured, avoiding problems such as deformation, thereby ensuring the connection strength between the connecting part 22 and the welded block 30, while ensuring that the sealing element 40 has sufficient compression to ensure reliable sealing. For example, in some specific embodiments, the thickness of the welded block 30 can be 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc. For example, in some specific embodiments, along the axial direction of the welded block 30, the length of the through hole 31 can be 0.2 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0069] In some embodiments of this utility model, such as Figure 5 As shown, one end of the main body 21 near the connecting portion 22 (for example) Figure 5 The lower end shown) and one end of the cover body 10 near the pole group 52 (e.g. Figure 5 The lower end shown is flush with the seal 40, which ensures that the compression on the inner and outer sides of the seal is consistent, thus ensuring reliable sealing.

[0070] According to some embodiments of the present invention, such as Figure 13 As shown, the wall thickness of the connecting portion 22 is greater than or equal to 1.0 mm, that is, the wall thickness of the connecting portion 22 is W1 and satisfies W1≥1.0 mm. Within the above-mentioned size range, the connecting portion 22 has sufficient wall thickness to ensure the structural strength after being connected with the welding block 30, and to ensure the reliability of the connection. For example, in some specific embodiments, the wall thickness of the connecting portion 22 can be 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, etc.

[0071] In some embodiments, such as Figure 17As shown, when the end of the connecting portion 22 near the electrode assembly 52 is bent toward the side near the welding block 30, the length of the connecting portion 22 extending toward the welding block 30 from the end near the electrode assembly 52 is greater than or equal to 0.15 mm. That is, when the connecting portion 22 near the electrode assembly 52 is bent toward the side near the welding block 30, the length of the connecting portion 22 extending toward the welding block 30 from the end near the electrode assembly 52 is W2 and satisfies W2≥0.15 mm. Within the above-mentioned size range, it is possible to ensure that the connecting portion 22 and the welding block 30 are reliably connected, thereby ensuring that the electrode post 20 and the welding block 30 are reliably connected, guaranteeing the connection strength of the riveting, and thus ensuring that the electrode post 20 is reliably fixed on the cover body 10. For example, in some specific embodiments, when the end of the connecting portion 22 near the electrode group 52 is bent toward the side near the welding block 30, the length of the end of the connecting portion 22 near the electrode group 52 extending toward the welding block 30 can be 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.35mm, etc.

[0072] In some embodiments of this utility model, such as Figure 5 As shown, the welding block 30 has a through hole 31, which avoids the electrode post 20, facilitating the fitting of the welding block 30 onto the electrode post 20. The end face of the welding block 30 near the electrode assembly 52 (e.g.) Figure 5 A clearance groove 32 is provided on the lower end face shown in the figure. The clearance groove 32 is arranged around the through hole 31. The end of the pole post 20 near the pole group 52 is located on the side of the clearance groove 32 away from the pole group 52 (e.g. Figure 5 As shown on the upper side), the avoidance groove 32 can prevent the weld point generated when welding the welding block 30 and the pole post 20 from protruding from the welding block 30, thereby avoiding problems such as interference between the weld point and other structures or short circuits, ensuring the safety of the battery cell 200, and facilitating assembly, making the structure compact and helping to reduce the space occupied by the battery cell 200.

[0073] In some embodiments, such as Figure 5 As shown, the depth of the clearance groove 32 is greater than or equal to 0.15 mm, that is, the depth of the clearance groove 32 is H1 and satisfies H1≥0.15 mm. Within the above-mentioned size range, it can be ensured that the clearance groove 32 shields the solder joint, preventing the solder joint from protruding from the welding block 30, ensuring the safety of the battery cell 200, and making the structure compact. For example, in some specific embodiments, the depth of the clearance groove 32 can be 0.15 mm, 0.20 mm, 0.25 mm, 0.30 mm, 0.35 mm, etc.

[0074] According to some embodiments of the present invention, such as Figure 5 , Figures 10-18As shown, the end of the pole column 20 away from the pole group 52 is provided with a protruding portion 23, which extends in the circumferential direction of the pole column 20. The protruding portion 23 can improve the structural strength of the pole column 20 and prevent deformation of the pole column 20 when connected to an external structure.

[0075] In addition, as shown in Figure 13 , the thickness of the protruding portion 23 is greater than or equal to 0.8 mm, i.e., the thickness of the protruding portion 23 is W3 and satisfies W3≥0.8 mm. Within the above size range, the structural strength of the pole column 20 can be further ensured to prevent deformation and other problems, and the strength requirement of the connection between the pole column 20 and the external structure can be met. For example, in some embodiments, the thickness of the protruding portion 23 can be 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0076] In some embodiments, as shown in Figure 5 , the cover plate assembly 100 further includes an upper plastic 62, which is located between the protruding portion 23 and the cover body 10, i.e., the protruding portion 23 abuts against the side of the cover body 10 away from the pole group 52 (e.g., the upper side shown in Figure 5 ) through the upper plastic 62. The upper plastic 62 can insulate between the protruding portion 23 and the cover body 10 to prevent short circuiting or electric leakage and ensure the safety of the battery monomer 200. Meanwhile, by bending the end of the pole column 20 close to the pole group 52 towards the side close to the welding block 30 to connect with the welding block 30, and abutting the protruding portion 23 against the side of the cover body 10 away from the pole group 52 through the upper plastic 62, the pole column 20 can be fixed reliably on the cover body 10 to prevent loosening of the pole column 20, thereby ensuring the safety of the battery monomer 200.

[0077] In some embodiments in which the cover plate assembly 100 further includes a sealing member 40, the pole column 20 is processed as shown in Figures 10-15 . When the cover plate assembly 100 is assembled, the pole column 20 is arranged in the upper plastic 62, the cover body 10, the sealing member 40, and the welding block 30, and then the end of the pole column 20 close to the pole group 52 is bent towards the side close to the welding block 30 to form the pole column 20 as shown in Figures 16-18 . The end of the pole column 20 close to the pole group 52 is connected with the welding block 30 to form the cover plate assembly 100, achieve the assembly of the cover plate assembly 100, meet the required connection requirement, and reduce the parts of the cover plate in the related art, which is conducive to reducing the production cost.

[0078] In some embodiments, the pole column 20 can be formed by one-time stamping without secondary processing, which is simple to manufacture, has high connection strength, is conducive to reducing the processing cost, and reduces the assembly process, thereby improving the production efficiency.

[0079] Other configurations and operations of the cover plate assembly 100 and the battery cell 200 according to the embodiments of the present application are known to those skilled in the art, and thus will not be described in detail herein.

[0080] In the description of the present application, it should be noted that unless explicitly defined and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the description of the present application, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, Used for battery cells, and includes: A cover body, wherein the cover body is provided with mounting holes; A terminal post, which passes through the mounting hole; A welding block is sleeved on the electrode post and located on the side of the cover body near the electrode group of the battery cell. The end of the electrode post near the electrode group is bent toward the side near the welding block to connect with the welding block.

2. The cover plate assembly according to claim 1, characterized in that, The bending angle of the end of the pole near the pole assembly is 25°-65°.

3. The cover plate assembly according to claim 1, characterized in that, The pole includes: A body portion, which passes through the mounting hole and extends out of the mounting hole toward a side away from the electrode assembly; A connecting portion, which is formed in an annular shape and connected to one end of the body portion near the electrode group, wherein the end of the connecting portion near the electrode group is bent toward the side near the welding block to connect with the welding block.

4. The cover plate assembly according to claim 3, characterized in that, The end face of the main body near the connecting part is provided with a groove that is recessed in the direction away from the connecting part.

5. The cover plate assembly according to claim 3, characterized in that, The cover plate assembly also includes: A sealing element is fitted onto the connecting portion and located on the side of the welding block away from the pole assembly. The radially inner side of the sealing element abuts against the body portion, and the radially outer side of the sealing element abuts against the cover body.

6. The cover plate assembly according to claim 5, characterized in that, The end of the main body near the connecting portion is flush with the end of the cover body near the pole assembly.

7. The cover plate assembly according to claim 3, characterized in that, The wall thickness of the connecting part is greater than or equal to 1.0 mm.

8. The cover plate assembly according to claim 1, characterized in that, The welding block has a through hole for avoiding the pole post, and the end face of the welding block near the pole group has an avoidance groove surrounding the through hole. The end of the pole post near the pole group is located on the side of the avoidance groove away from the pole group.

9. The cover plate assembly according to any one of claims 1-8, characterized in that, The end of the pole away from the pole group is provided with a protrusion extending in the circumferential direction of the pole, and the thickness of the protrusion is greater than or equal to 0.8 mm.

10. A single battery cell, characterized in that, include: A housing, one side of which is open to form an opening; A pole assembly, wherein the pole assembly is disposed within the housing; According to any one of claims 1-9, the cover body covers the opening, and the weld block is located on the side of the cover body closer to the pole assembly.

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