Top cover assembly, battery and electric equipment

Abstract

The utility model provides a top cover assembly, a battery and electric equipment, the top cover assembly comprises an upper plastic and a welding ring, the welding ring comprises a base and a side wall, the base is arranged in a mounting port of a cover plate, one end, far away from a battery cell, of the side wall is embedded in the upper plastic, and the side wall is provided with an anti-rotation port; part of the upper plastic is located in the anti-rotation opening after injection molding, so that the welding ring can increase the limiting effect on the upper plastic, the anti-torsion effect of the upper plastic is improved, deformation of the upper plastic is avoided, and the stability and safety of the top cover assembly are ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to top cover assemblies, batteries, and electrical devices. Background Technology

[0002] In related technologies, a battery cover is a component that seals the opening of the battery cell casing. Its main function is to provide physical protection for the battery, ensuring its safe isolation from other internal components and preventing damage from external factors. The cover assembly typically includes a cover plate, an upper plastic layer, connecting tabs, and terminals. Welding rings can be welded to and fixed to the cover plate. However, after a certain period of use, the upper plastic layer is prone to deformation or even breakage, posing a significant safety hazard. Utility Model Content

[0003] Embodiments of this application provide a top cover assembly, a battery, and an electrical device that can improve the technical problem of easy deformation of the plastic coating.

[0004] In a first aspect, embodiments of this application provide a top cover assembly, the top cover assembly comprising:

[0005] Cover plate, with mounting opening;

[0006] The terminal post is partially installed in the mounting port and is used to connect to the battery cell;

[0007] The plastic material is applied to the side of the cover plate away from the battery cell and is sleeved on the outside of the electrode post;

[0008] The welding ring includes a base and a sidewall. The base is disposed in the mounting port and surrounds the electrode post. The sidewall is connected to the side of the base away from the battery cell. The end of the sidewall away from the battery cell is embedded in the upper plastic. The sidewall has an anti-rotation opening, and part of the upper plastic is located in the anti-rotation opening.

[0009] In some embodiments, the anti-rotation opening is provided at the end of the side wall away from the base, and the notch forms the anti-rotation opening.

[0010] In some embodiments, the anti-rotation port extends from one end of the base toward the end away from the base.

[0011] In some embodiments, a through hole is provided along the thickness direction of the sidewall, and the through hole forms the anti-rotation opening.

[0012] In some embodiments, the sidewall includes a wall body and a bend, the wall body being connected to the base, and the bend being connected to the end of the wall body away from the base and bending toward the pole post.

[0013] The upper plastic body is provided with a limiting groove, which includes a first groove and a second groove. The second groove is located at the end of the first groove away from the cover plate and is in communication with the first groove. The wall is located in the first groove, and the first groove and the wall are adapted to each other. The bent part is located in the second groove, and the second groove and the bent part are adapted to each other.

[0014] In some embodiments, the cover plate includes a plate body and a protrusion, the plate body includes a side facing the electrode post, the protrusion is connected to the side face and protrudes in the direction of the electrode post, the protrusion includes a top surface facing away from the battery cell, the base is attached to the top surface, and the sidewall is attached to the side face.

[0015] In some embodiments, the top cover assembly further includes a lower plastic section, the lower plastic section including a flat section and a protrusion, the flat section being attached to the cover plate, the protrusion being connected to one end of the flat section near the electrode post and protruding in the direction away from the battery cell, a gap being formed between the protrusion and the protrusion, and the welding ring further including a plug-in portion, the plug-in portion being connected to the side of the base facing the battery cell and plugged into the gap.

[0016] In some embodiments, the top cover assembly further includes a sealing ring, one side of which abuts against the pole post and the other side against the upper plastic and / or the base.

[0017] In some embodiments, the electrode post includes a body and a convex ring, the convex ring being connected to the side of the body facing the battery cell and protruding toward the battery cell, and the sealing ring surrounding the convex ring.

[0018] In some embodiments, the convex ring forms a receiving groove, and the top cover assembly further includes a connecting piece, the connecting piece including a connecting portion that protrudes in a direction away from the battery cell and passes through the mounting opening, the connecting portion being at least partially located within the receiving groove.

[0019] Secondly, embodiments of this application provide a battery, including the top cover assembly as described above. The battery also includes a cell and a housing. The cell is disposed inside the housing. The housing has an opening. The top cover assembly covers the opening. The battery also includes a connecting piece. The connecting piece is attached to the cover plate and connected to the cell.

[0020] Thirdly, embodiments of this application provide an electrical device, including the battery as described above.

[0021] The beneficial effects of the embodiments of this application are as follows:

[0022] The top cover assembly provided in this application includes an upper plastic and a welding ring. The welding ring includes a base and a side wall. The base is disposed in the mounting opening of the cover plate, and the end of the side wall away from the battery cell is embedded in the upper plastic. The side wall has an anti-rotation opening. After part of the upper plastic is injection molded, it is located in the anti-rotation opening, so that the welding ring can increase the limiting effect on the upper plastic, improve the anti-torsion effect of the upper plastic, avoid deformation of the upper plastic, and ensure the stability and safety of the top cover assembly. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in an embodiment of this application;

[0025] Figure 2 This is an exploded view of the top cover assembly provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the welding ring provided in an embodiment of this application. Figure 1 ;

[0027] Figure 4 This is a schematic diagram of the structure of the welding ring provided in an embodiment of this application. Figure 2 .

[0028] Figure 5 This is a top view of the top cover assembly provided in an embodiment of this application;

[0029] Figure 6 yes Figure 5 The top cover assembly shown is a cross-sectional view along AA;

[0030] Figure 7 yes Figure 6 An enlarged schematic diagram of part A of the top cover assembly shown;

[0031] Figure 8 yes Figure 5 The top cover assembly shown is a cross-sectional view along BB;

[0032] Figure 9 yes Figure 8 An enlarged schematic diagram of part B of the top cover assembly shown;

[0033] Figure 10 This is a top view of the pole provided in an embodiment of this application;

[0034] Figure 11yes Figure 10 The pole shown is a cross-sectional view along CC.

[0035] Figure 12 This is another structural schematic diagram of the pole post and welding ring provided in an embodiment of this application.

[0036] Figure label:

[0037] 100. Cover plate assembly;

[0038] 10. Cover plate; 101. Mounting port; 11. Plate body; 12. Protrusion;

[0039] 20. Pole post; 201. First part; 202. Second part; 21. Body; 22. Protruding ring;

[0040] 30. Welding ring; 301. Anti-rotation opening; 31. Base; 32. Side wall; 321. Wall; 322. Bending part; 33. Insertion part;

[0041] 40. Plastic filling; 401. Limiting groove; 4011. First groove; 4012. Second groove;

[0042] 50. Lower plastic section; 51. Straight section; 52. Raised section;

[0043] 60. Sealing ring;

[0044] 70. Connecting piece. Detailed Implementation

[0045] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0046] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in an embodiment of this application. Figure 2This is an exploded view of a top cover assembly provided in an embodiment of this application. This application provides a top cover assembly 100 for connecting a battery cell. It is understood that a cover plate 10 is mounted on the top of the battery casing, while the battery cell is located inside the casing, i.e., at the bottom of the cover plate 10. The top cover assembly 100 includes a cover plate 10, a terminal post 20, an upper plastic insert 40, and a welding ring 30. The cover plate 10 has a mounting opening 101, and the terminal post 20 is partially mounted in the mounting opening 101 and used to connect to the battery cell. The upper plastic insert 40 abuts against the side of the cover plate 10 opposite to the battery cell and is sleeved on the outside of the terminal post 20.

[0047] Please continue to refer to this. Figure 3 , Figure 3 This is a schematic diagram of the structure of the welding ring provided in an embodiment of this application. Figure 1 The welding ring 30 includes a base 31 and a side wall 32. The base 31 is disposed in the mounting port 101 and surrounds the pole post 20. The side wall 32 is connected to the side of the base 31 away from the battery cell. The end of the side wall 32 away from the battery cell is embedded in the upper plastic 40, and the side wall 32 has an anti-rotation opening 301. Part of the upper plastic 40 is located in the anti-rotation opening 301.

[0048] Understandably, the upper plastic 40 is usually made by injection molding. It can be injection molded using a specific mold and then installed in the top cover assembly. Alternatively, the pole post 20 and the welded parts can be assembled first to form an intermediate part, and then the upper plastic 40 can be injection molded into the intermediate part. In this case, the welded ring 30 is provided with an anti-rotation port 301, so that the fluid material can flow into the anti-rotation port 301. After cooling and molding, the welded ring 30 is partially embedded in the upper plastic 40 and forms an anti-torsion structure.

[0049] The top cover assembly 100 provided in this application includes an upper plastic 40 and a welding ring 30. The welding ring 30 includes a base 31 and a side wall 32. The base 31 is disposed in the mounting opening 101 of the cover plate 10. The end of the side wall 32 away from the battery cell is embedded in the upper plastic 40, and the side wall 32 has an anti-rotation opening 301. After part of the upper plastic 40 is injection molded, it is located in the anti-rotation opening 301, so that the welding ring 30 can increase the limiting effect on the upper plastic 40, improve the anti-torsion effect of the upper plastic 40, avoid deformation of the upper plastic 40, and ensure the stability and safety of the top cover assembly 100.

[0050] In some embodiments, the anti-rotation opening 301 is provided with a notch at the end of the side wall 32 away from the base 31, and the notch forms the anti-rotation opening 301. Specifically, the notch is located at the end of the side wall 32 away from the base 31, and multiple notches are spaced apart on the side wall 32 so that fluid material can flow into the notch. The side wall 32 includes a first groove wall and a second groove wall forming the notch. The two first groove walls are arranged opposite to each other, and the second groove wall is located at the bottom of the first groove wall and its two ends are respectively connected to one of the first groove walls. After cooling and molding, it is fixed in the notch. The oppositely arranged first groove walls can play a better limiting role for the upper plastic 40.

[0051] In some embodiments, the anti-rotation opening 301 extends from one end of the base 31 toward the end away from the base 31. Specifically, the sidewall 32 includes a plurality of sub-walls, which are spaced apart along the base 31. An anti-rotation opening 301 is formed between two adjacent sub-walls, and a portion of the upper plastic 40 is located within the anti-rotation opening 301. The length of the anti-rotation opening 301 can be the same as the length of the sidewall 32. During injection molding, the upper plastic 40 is embedded between adjacent sub-walls to form an anti-rotation structure.

[0052] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the welding ring provided in an embodiment of this application. Figure 2 In some embodiments, a through hole is formed along the thickness direction of the sidewall 32, and the through hole forms the anti-rotation opening 301. Specifically, the through hole is located in the middle of the sidewall 32, and the sidewall 32 includes a hole wall forming the through hole. After molding, the upper plastic 40 is partially embedded in the through hole, and the hole wall can restrict the rotation of the upper plastic 40.

[0053] Please refer to Figures 5-7 , Figure 5 This is a top view of the top cover assembly provided in an embodiment of this application. Figure 6 yes Figure 5 The top cover assembly shown is a cross-sectional view along AA. Figure 7 yes Figure 6 The diagram shows an enlarged view of a portion A of the top cover assembly. In some embodiments, the sidewall 32 includes a wall body 321 and a bend 322. The wall body 321 is connected to the base 31, and the bend 322 is connected to the end of the wall body 321 away from the base 31 and bends toward the pole post 20.

[0054] The upper plastic 40 is provided with a limiting groove 401, which includes a first groove 4011 and a second groove 4012. The second groove 4012 is located at the end of the first groove 4011 away from the cover plate 10 and is in communication with the first groove 4011. The wall 321 is located in the first groove 4011 and the first groove 4011 and the wall 321 are adapted to each other. The bent part 322 is located in the second groove 4012 and the second groove 4012 and the bent part 322 are adapted to each other.

[0055] Specifically, during the injection molding process, a limiting groove 401 structure that matches the sidewall 32 is formed within the upper plastic 40. The sidewall 32 extends axially, and the bent portion 322 bends radially. That is, the first groove 4011 extends axially, and the second groove 4012 bends radially. The extension directions of the wall 321 and the bent portion 322 are different, which can increase the limiting effect on the upper plastic 40 in different directions.

[0056] In some embodiments, the cover plate 10 includes a plate body 11 and a protrusion 12. The plate body 11 includes a side facing the electrode post 20. The protrusion 12 is connected to the side and protrudes toward the electrode post 20. The protrusion 12 includes a top surface away from the battery cell. The base 31 is attached to the top surface, and the side wall 32 is attached to the side surface.

[0057] Please refer to Figures 8-9 , Figure 8 yes Figure 5 The top cover assembly shown is a cross-sectional view along BB. Figure 9 yes Figure 8 The diagram shows an enlarged view of part B of the top cover assembly. In some embodiments, the top cover assembly further includes a lower plastic 50, which includes a straight section 51 and a protrusion 52. The straight section 51 is attached to the cover plate 10, and the protrusion 52 is connected to the end of the straight section 51 near the electrode post 20 and protrudes in the direction away from the battery cell. A gap is formed between the protrusion 12 and the protrusion 52. The welding ring 30 further includes a plug-in portion 33, which is connected to the side of the base 31 facing the battery cell and plugs into the gap.

[0058] In some embodiments, the top cover assembly further includes a sealing ring 60, one side of which abuts against the pole post 20 and the other side of which abuts against the upper plastic 40 and / or the base 31.

[0059] In some cases, the sealing ring 60 abuts between the pole post 20 and the base 31.

[0060] In some cases, the sealing ring 60 extends away from the battery cell and abuts between the terminal post 20 and the upper plastic 40.

[0061] Because the sealing ring 60 has elastic deformation capability, when the sealing ring 60 is pressed tightly onto the cover plate 10, on the one hand, the installation of the terminal post 20 on the cover plate 10 can be more stable, and on the other hand, the compressed sealing ring 60 has a better sealing effect on the terminal post 20 and the welding ring 30, thereby enhancing the sealing performance of the top cover assembly 100, improving the safety performance of the battery, and increasing the battery's service life.

[0062] The sealing ring 60 can be made of fluororubber, silicone, nitrile rubber, etc., to prevent electrolyte from corroding the plastic parts through the gaps, to prevent electrolyte from corroding the cover plate 10 and causing a short circuit in the battery, and also to serve as an insulating cover plate 10, thereby improving the insulation performance between the cover plate 10 and the battery cell.

[0063] Please refer to Figures 10-11 , Figure 10 This is a top view of the pole provided in an embodiment of this application. Figure 11 yes Figure 10 The diagram shows a cross-sectional view of the electrode post along the CC direction. In some embodiments, the electrode post 20 includes a body 21 and a protruding ring 22, the protruding ring 22 being connected to the side of the body 21 facing the battery cell and protruding towards the battery cell, and the sealing ring 60 surrounding the protruding ring 22.

[0064] In some embodiments, the electrode post 20 includes a first portion 201 and a second portion 202, the first portion 201 and the second portion 202 are made of different materials, the first portion 201 is connected to the second portion 202 on the side away from the battery cell, the protruding ring 22 is located in the second portion 202, and the material of the first portion 201 is partially embedded in the protruding ring 22.

[0065] Please refer to Figure 12 , Figure 12 This is another structural schematic diagram of the pole post and welding ring provided in an embodiment of this application. In some embodiments, a through hole is provided along the thickness direction of the side wall 32, forming an anti-rotation opening 301. At least a portion of the pole post 20 extends outward and is inserted into the anti-rotation opening 301. The pole post 20 and the welding ring 30 can mutually restrict displacement, reduce rotation, and improve anti-torsion effect.

[0066] Specifically, the composite electrode 20 is a type of electrode 20 used in battery manufacturing, composed of a combination of multiple materials, typically different metals, alloys, coatings, or other functional materials. The composite electrode 20 can optimize the battery's conductivity, mechanical strength, corrosion resistance, and cost while ensuring battery performance. This composite electrode 20 is commonly used in batteries with high performance requirements. The materials of the first part 201 and the second part 202 can be copper-nickel composite materials, aluminum-nickel composite materials, nickel-copper composite materials, copper-aluminum composite materials, etc.

[0067] In some embodiments, the convex ring 22 forms a receiving groove, and the top cover assembly further includes a connecting piece 70, the connecting piece 70 including a protruding structure that protrudes 52 away from the cell and passes through the mounting opening 101, the protruding structure being at least partially located within the receiving groove. The convex ring 22 can increase the connection area between the terminal post 20 and the protruding structure, and through electrical connection with the terminal post body 21 and the surrounding convex ring 22, current can flow stably between the battery terminal post 20 and the cell.

[0068] This application also provides a battery, which can be a primary battery, a secondary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, etc. The battery cell can be cylindrical, flat, cuboid, or other shapes, etc., and this application does not limit it.

[0069] The battery also includes a cell and a casing. The cell is disposed inside the casing, which has an opening. The top cover assembly covers the opening, and the connecting piece 70 is connected to the cell. Specifically, the cell is connected to the connecting piece 70, and the connecting piece 70 is connected to the terminal 20. Thus, after the battery top cover seals the battery casing, the battery current is conducted through the terminal 20 to connect to an external circuit.

[0070] In some embodiments, the cover plate 10 is provided with two mounting ports 101, the electrode post 20 includes a positive electrode post 20 and a negative electrode post 20, and the top cover assembly includes two sealing rings 60, two upper plastics 40 and two welding rings 30. One set of welding rings 30, upper plastics 40 and sealing rings 60 are respectively connected to the positive electrode post 20, and the other set of welding rings 30, upper plastics 40 and sealing rings 60 are connected to the negative electrode post 20. The specific connection method is as described above, and will not be repeated here.

[0071] This application also provides an electrical device, which includes the battery as described above, for providing electrical energy to the device. The electrical device can be an electric vehicle, power tool, electric bicycle, energy storage system, drone, mobile device, etc. By incorporating a battery, the safety of the electrical device can be ensured, and its service life can be extended.

[0072] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A top cap assembly for connecting a battery cell, characterized by, The top cover assembly comprises: a cover plate provided with a mounting hole; a pole partially mounted in the mounting hole and used for connecting to the battery cell; an upper plastic abutting against a side of the cover plate away from the battery cell and sleeved on the outside of the pole; a welding ring comprising a base and a side wall, the base being arranged in the mounting hole and surrounding the pole, the side wall being connected to a side of the base away from the battery cell, one end of the side wall away from the battery cell being embedded in the upper plastic, and the side wall being provided with an anti-rotation hole, part of the upper plastic being located in the anti-rotation hole.

2. The roof assembly of claim 1, wherein, The anti-rotation hole is provided with a notch at one end of the side wall away from the base, and the notch forms the anti-rotation hole.

3. The roof assembly of claim 2, wherein, The anti-rotation hole is arranged from one end of the base to the end away from the base.

4. The roof assembly of claim 1, wherein, A through hole is arranged along the thickness direction of the side wall, and the through hole forms the anti-rotation hole.

5. The roof assembly of any of claims 1-4, wherein, The side wall comprises a wall body and a bent portion, the wall body being connected to the base, and the bent portion being connected to one end of the wall body away from the base and being bent towards the pole; The upper plastic is provided with a limiting groove, the limiting groove comprising a first groove body and a second groove body, the second groove body being located at one end of the first groove body away from the cover plate and being in communication with the first groove body, the wall body being located in the first groove body, the first groove body and the wall body being matched, the bent portion being located in the second groove body, and the second groove body and the bent portion being matched.

6. The roof assembly of any of claims 1-4, wherein, The cover plate comprises a plate body and a protruding portion, the plate body comprising a side surface facing the pole, the protruding portion being connected to the side surface and protruding towards the pole, the protruding portion comprising a top surface away from the battery cell, the base being attached to the top surface, and the side wall being attached to the side surface.

7. The roof assembly of claim 6, wherein, The top cover assembly further comprises a lower plastic, the lower plastic comprising a flat section and a protrusion, the flat section being attached to the cover plate, the protrusion being connected to one end of the flat section close to the pole and protruding away from the battery cell, a gap being formed between the protruding portion and the protrusion, and the welding ring further comprising a plug-in portion, the plug-in portion being connected to one side of the base facing the battery cell and being plugged into the gap.

8. The roof assembly of any of claims 1-4, wherein, The top cover assembly further comprises a sealing ring, one side of the sealing ring abutting against the pole and the other side abutting against the upper plastic and / or the base.

9. The roof assembly of claim 8, wherein, The pole comprises a body and a protruding ring, the protruding ring being connected to one side of the body facing the battery cell and protruding towards the battery cell, and the sealing ring surrounding the protruding ring.

10. The roof assembly of claim 9, wherein, The protruding ring forms a receiving groove facing the battery cell, the top cover assembly further comprising a connecting sheet, the connecting sheet comprising a protruding structure, the protruding structure protruding away from the battery cell and penetrating the mounting hole, and the protruding structure being at least partially located in the receiving groove.

11. A battery, characterized by The battery comprises the top cover assembly according to any one of claims 1-10, the battery further comprising a battery cell and a shell, the battery cell being arranged in the shell, the shell being provided with an opening, and the top cover assembly being arranged on the opening and connected to the battery cell.

12. An electrical device, characterized by The battery comprises the battery according to claim 11.

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