Top cover assembly, battery and electric equipment

Abstract

The utility model provides a top cover assembly, a battery and electric equipment, an upper plastic comprises a bottom surface facing a battery cell and a peripheral surface surrounding the bottom surface, the bottom surface is attached to the top surface of a protruding part and can limit the upper plastic in the vertical direction, and the peripheral surface is attached to the inner wall surface of a plate body and can limit the upper plastic in the vertical direction. The upper plastic can be limited in the horizontal direction, so that the upper plastic is prevented from displacement, and the safety of the top cover assembly is improved.

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, the 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 safe isolation between the battery and other internal components of the device, and preventing damage to the battery from external factors. The top cover assembly typically includes components such as a cover plate, upper plastic, connecting pieces, and terminals. The upper plastic provides good insulation protection; however, if the upper plastic is not securely connected, it can easily shift, reducing battery safety. 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 displacement of the upper plastic.

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

[0005] A cover plate, the cover plate including a plate body and a protrusion, the plate body having an installation opening, the plate body including an inner wall surface forming the installation opening, the protrusion being connected to one end of the inner wall surface of the installation opening facing the battery cell and protruding in a direction away from the plate body, the protrusion including a first top surface facing away from the battery cell;

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

[0007] A welding ring is disposed within the mounting opening;

[0008] An upper plastic is fitted onto the outside of the electrode post, and the welding ring is at least partially embedded in the upper plastic. The upper plastic includes a bottom surface facing the battery cell and a peripheral surface surrounding the bottom surface. The bottom surface is attached to the first top surface, and the peripheral surface is attached to the inner wall surface.

[0009] In some embodiments, the upper plastic includes a second top surface facing away from the battery cell, and the electrode includes a third top surface facing away from the battery cell, wherein the height difference between the second top surface and the third top surface is H1, and H1 ≥ 0.3 mm.

[0010] In some embodiments, the welding ring includes a base plate, the base plate includes two first sides disposed opposite to each other, the welding ring also includes two first sidewalls disposed opposite to each other, the two first sidewalls are respectively connected to one of the first sides and both protrude in the direction away from the battery cell, and the first sidewalls are at least partially embedded in the upper plastic.

[0011] In some embodiments, the welding ring includes a base plate, the base plate includes two second sides disposed opposite to each other, and the two ends of the second sides are respectively connected to a first side. The welding ring also includes two first sidewalls disposed opposite to each other, the two second sidewalls are respectively connected to a second side and both protrude in the direction away from the battery cell, and the second sidewalls are at least partially embedded in the upper plastic.

[0012] In some embodiments, each first sidewall includes a plurality of first subwalls, the plurality of first subwalls being spaced apart along the first sidewall, an anti-rotation opening being formed between adjacent two first subwalls, and a portion of the upper plastic being located within the anti-rotation opening; and / or

[0013] Each second sidewall includes a plurality of second subwalls, which are spaced apart along the second side. An anti-rotation opening is formed between two adjacent first subwalls, and part of the upper plastic is located within the anti-rotation opening.

[0014] In some embodiments, each of the first sub-walls or each of the second sub-walls includes a connecting arm and a bent portion. The bent portion is connected to the end of the connecting arm away from the battery cell and bends towards the electrode post. A limiting groove is provided in the upper plastic. The limiting groove 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 communicates with the first groove. The connecting arm is located in the first groove, and the bent portion is located in the second groove. The first groove and the connecting arm are adapted to each other, and the second groove and the bent portion are adapted to each other.

[0015] In some embodiments, the electrode post includes a first part and a second part, the second part being connected to the first part on the side near the battery cell, the first part and the second part being made of different materials, and the thickness of the second part being between 0.5 mm and 5 mm.

[0016] In some embodiments, the top cover assembly further includes a connecting piece, the connecting piece including a protruding structure that protrudes away from the battery cell and passes through the mounting opening, the second portion including a plane facing the battery cell, the protruding structure being attached to the plane.

[0017] In some embodiments, the top cover assembly further includes a sealing ring disposed between the connecting piece and the welding ring.

[0018] In a second direction, this application also provides a battery, including the top cover assembly as described above, the battery further including a cell and a housing, the cell being disposed within the housing, the housing having an opening, and the top cover assembly covering the opening.

[0019] Thirdly, this application also provides a battery, including the battery as described above.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In embodiments of this application, the upper plastic includes a bottom surface facing the battery cell and a peripheral surface surrounding the bottom surface. The bottom surface is attached to the first top surface of the protrusion, which can limit the upper plastic in the vertical direction. The peripheral surface is attached to the inner wall surface of the plate, which can limit the upper plastic in the horizontal direction to prevent the upper plastic from shifting and improve the safety of the top cover assembly. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in an embodiment of this application;

[0024] Figure 2 This is an exploded view of the top cover assembly provided in an embodiment of this application;

[0025] Figure 3 This is a top view of the top cover assembly provided in an embodiment of this application;

[0026] Figure 4 yes Figure 3 A cross-sectional view of the top cover assembly shown;

[0027] Figure 5 yes Figure 3 An enlarged schematic diagram of part A of the top cover assembly shown;

[0028] Figure 6 yes Figure 3 The diagram shows the structure of the welding ring.

[0029] Figure 7 This is a top view of the pole provided in an embodiment of this application;

[0030] Figure 8 This is a cross-sectional view of the pole provided in an embodiment of this application.

[0031] Figure label:

[0032] 100. Top cover assembly;

[0033] 10. Cover plate; 101. Mounting port; 11. Protrusion; 111. First top surface; 12. Plate body; 121. Inner wall surface;

[0034] 20. Pole post; 21. Part 1; 22. Part 2

[0035] 30. Welding ring; 301. Base plate; 31. First side edge; 311. First side wall; 3112. First sub-wall; 3121. Connecting arm; 3122. Bending part; 313. Anti-rotation opening;

[0036] 40. Top plastic; 41. Bottom surface; 42. Peripheral surface;

[0037] 50. Lower plastic;

[0038] 60. Sealing ring;

[0039] 70. Connecting piece. Detailed Implementation

[0040] The technical solutions of 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 the embodiments. Based on the embodiments of 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.

[0041] 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 2 This is an exploded view of the top cover assembly provided in the embodiments of this application. The top cover assembly 100 typically includes components such as a cover plate 10, an upper plastic 40, a connecting piece 70, and a pole post 20. The upper plastic 40 can provide good insulation protection; however, when the upper plastic 40 is not securely connected, it is prone to displacement, which can create safety hazards.

[0042] Please combine Figures 1-2 refer to Figures 3-5 , Figure 3 This is a top view of the top cover assembly provided in an embodiment of this application. Figure 4 yes Figure 3 The cross-sectional view of the top cover assembly shown. Figure 5 yes Figure 3The diagram shows a partial enlarged view of part A of the top cover assembly. This application provides a top cover assembly 100 for connecting a battery cell. It is understood that the 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 cover plate 10 includes a plate body 12 and a protrusion 11. The plate body 12 has a mounting opening 101 and includes an inner wall surface 121 forming the mounting opening 101. The protrusion 11 is connected to the end of the inner wall surface 121 of the mounting opening 101 facing the battery cell and protrudes in a direction away from the plate body 12. The protrusion 11 includes a first top surface 111 facing away from the battery cell.

[0043] The cover plate 10 further includes a terminal post 20, a welding ring 30, and an upper plastic 40. The terminal post 20 is partially installed in the mounting port 101 and is used to connect the battery cell. The welding ring 30 is disposed within the mounting port 101. The upper plastic 40 is sleeved on the outside of the terminal post 20, and the welding ring 30 is at least partially embedded within the upper plastic 40. The upper plastic 40 includes a bottom surface 41 facing the battery cell and a peripheral surface 42 surrounding the bottom surface 41. The bottom surface 41 is attached to the first top surface 111, and the peripheral surface 42 is attached to the inner wall surface 121.

[0044] The upper plastic 40 provided in this application includes a bottom surface 41 facing the battery cell and a peripheral surface 42 surrounding the bottom surface 41. The bottom surface 41 is attached to the first top surface 111 of the protrusion 11 and can limit the upper plastic 40 in the vertical direction. The peripheral surface 42 is attached to the inner wall surface 121 of the plate 12 and can limit the upper plastic 40 in the horizontal direction to prevent the upper plastic 40 from displacing and improve the safety of the top cover assembly 100.

[0045] In some embodiments, the upper plastic 40 includes a second top surface facing away from the battery cell, and the electrode post 20 includes a third top surface facing away from the battery cell. The height difference between the second top surface and the third top surface is H1, where H1 ≥ 0.3 mm. If the height difference is too small, it will affect the flatness of the contact with the end face of the electrode post 20 during welding, and it will be more difficult to form. The value of H1 can be 0.3 mm, 0.8 mm, 1.3 mm, 1.8 mm, 2.3 mm, etc., and is not limited herein.

[0046] Please refer to Figure 6 , Figure 6 yes Figure 3The diagram shows the structure of the welding ring. In some embodiments, the welding ring 30 includes a base plate 301, which includes two opposing first sides 31. The welding ring 30 also includes two opposing first sidewalls 311, each of which is connected to one of the first sides 31 and protrudes away from the direction of the battery cell. The first sidewalls 311 are at least partially embedded in the upper plastic 40. Specifically, during injection molding of the upper plastic 40, the first sidewalls 311 are at least partially located within the upper plastic 40. After cooling and molding, the first sidewalls 311 can be partially embedded within the upper plastic 40 to increase the limiting effect on the upper plastic 40 and reduce the displacement of the upper plastic 40.

[0047] In some embodiments, the welding ring 30 includes a base plate 301, which includes two opposing second sides. Each end of one of the second sides is connected to a first side 31. The welding ring 30 also includes two opposing second sidewalls, each connected to a second side and protruding away from the direction of the battery cell. The second sidewalls are at least partially embedded within the upper plastic 40. Specifically, the first sidewall 311 extends along a first direction, and the second sidewall extends along a second direction. When the upper plastic 40 is injection molded, the second sidewall is at least partially located within the upper plastic 40. After cooling and molding, the second sidewall is at least partially embedded within the upper plastic 40, thereby increasing the limiting effect on the upper plastic 40 in both the first and second directions and reducing the displacement of the upper plastic 40.

[0048] In some embodiments, each first sidewall 311 includes a plurality of first sub-walls 3112, the plurality of first sub-walls 3112 being spaced apart along the first side 31, an anti-rotation opening 313 being formed between two adjacent first sub-walls 3112, and a portion of the upper plastic 40 being located within the anti-rotation opening 313; and / or each second sidewall includes a plurality of second sub-walls, the plurality of second sub-walls being spaced apart along the second side, an anti-rotation opening 313 being formed between two adjacent second sub-walls, and a portion of the upper plastic 40 being located within the anti-rotation opening 313.

[0049] In some examples, the first sidewall 311 forms a plurality of first subwalls 3112, and the second sidewall forms a plurality of second subwalls;

[0050] In some examples, the first sidewall 311 forms a plurality of first sub-walls 3112, but the second sidewall does not form a plurality of second sub-walls, or the second sidewall forms a plurality of second sub-walls, but the first sidewall 311 does not form a plurality of first sub-walls 3112.

[0051] In some embodiments, the anti-rotation opening 313 is provided at the end of the first sidewall 311 away from the battery cell, and the opening forms the anti-rotation opening 313. Specifically, the opening is located at the end of the first sidewall 311 away from the battery cell, and multiple openings are spaced apart on the first sidewall 311, so that the fluid material forming the upper plastic 40 can flow into the opening. The first sidewall 311 includes a first groove wall and a second groove wall forming the opening. 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, the upper plastic 40 is fixed in the opening. The oppositely arranged first groove walls can play a better role in limiting the upper plastic 40.

[0052] In some embodiments, a through hole is formed along the thickness direction of the first sidewall 311, and the through hole forms the anti-rotation opening 313. Specifically, the first sidewall 311 includes a plurality of hole walls forming the through hole, the anti-rotation opening 313 is located in the middle of the first sidewall 311, and after molding, the upper plastic 40 is partially embedded in the through hole, and the hole walls can restrict the rotation of the upper plastic 40.

[0053] In some embodiments, each of the first sub-walls 3112 or each of the second sub-walls includes a connecting arm 3121 and a bending portion 3122. The bending portion 3122 is connected to the end of the connecting arm 3121 away from the battery cell and bends toward the electrode post 20. A limiting groove is provided in the upper plastic 40. The limiting groove 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 10 and communicates with the first groove. The connecting arm 3121 is located in the first groove, and the bending portion 3122 is located in the second groove. The first groove and the connecting arm 3121 are adapted to each other, and the second groove and the bending portion 3122 are adapted to each other.

[0054] Please refer to Figures 7-8 , Figure 7 This is a top view of the pole provided in an embodiment of this application. Figure 8 This is a cross-sectional view of the electrode post provided in an embodiment of this application. In some embodiments, the electrode post 20 includes a first portion 21 and a second portion 22, the second portion 22 being connected to the first portion 21 near the battery cell. The first portion 21 and the second portion 22 are made of different materials, and the thickness of the second portion 22 is between 0.5mm and 5mm, such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4.5mm, 5mm, etc.

[0055] 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 requirements. The materials of the first part 21 and the second part 22 can be copper-nickel composite materials, aluminum-nickel composite materials, nickel-copper composite materials, copper-aluminum composite materials, etc.

[0056] In some embodiments, the top cover assembly further includes a lower plastic 50, which includes a flat section and a protrusion. The flat section is attached to the side of the cover plate 10 facing the battery cell, and the protrusion is connected to one end of the flat section near the electrode post 20 and protrudes in the direction away from the battery cell. A gap is formed between the protrusion 11 and the protrusion. The welding ring 30 further includes a plug-in portion, which is connected to the side of the protrusion 11 facing the battery cell and plugs into the gap.

[0057] In some embodiments, the top cover assembly 100 further includes a connecting piece 70, the connecting piece 70 including a protruding structure that protrudes away from the battery cell and passes through the mounting opening 101, the second portion 22 including a plane facing the battery cell, the protruding structure being attached to the plane. Through the connection between the protruding structure and the second portion 22, the connecting piece 70 enables a stable flow of current between the battery terminals 20 and the battery cell.

[0058] In some embodiments, the top cover assembly 100 further includes a sealing ring 60 disposed between the connecting piece 70 and the welding ring 30.

[0059] In some embodiments, the sealing ring 60 may also extend away from the connecting piece 70 and seal between the upper plastic 40 and the pole post 20.

[0060] 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.

[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 battery top cover assembly 100, improving the battery safety performance, and increasing the battery life.

[0062] 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.

[0063] The battery also includes a cell and a casing. The cell is disposed inside the casing, which has an opening. The top cover assembly 100 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.

[0064] 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 100 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.

[0065] 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.

[0066] 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 application relates to a cover plate for a battery cell, comprising: a cover plate, comprising a plate body and a protruding part, the plate body is provided with a mounting opening, the plate body comprises an inner wall surface forming the mounting opening, the protruding part is connected to one end of the inner wall surface of the mounting opening and protrudes towards the battery cell, the protruding part comprises a first top surface away from the battery cell; a pole, partially mounted in the mounting opening and used for connecting the battery cell; a welding ring arranged in the mounting opening; an upper plastic sleeve arranged outside the pole, the welding ring is at least partially embedded in the upper plastic sleeve, the upper plastic sleeve comprises a bottom surface towards the battery cell and a circumferential surface surrounding the bottom surface, the bottom surface is attached to the first top surface, and the circumferential surface is attached to the inner wall surface.

2. The roof assembly of claim 1, wherein, The upper plastic sleeve comprises a second top surface away from the battery cell, the pole comprises a third top surface away from the battery cell, the height difference between the second top surface and the third top surface is H1, and H1 is greater than or equal to 0.3 mm.

3. The roof assembly of claim 2, wherein, The welding ring comprises a bottom plate, the bottom plate comprises two first side edges arranged oppositely, the welding ring further comprises two first side walls arranged oppositely, the two first side walls are respectively connected to one of the first side edges and are both arranged to protrude away from the battery cell, and the first side walls are at least partially embedded in the upper plastic sleeve.

4. The roof assembly of claim 3, wherein, The welding ring comprises a bottom plate, the bottom plate comprises two second side edges arranged oppositely, the two ends of the second side edges are respectively connected to one of the first side edges, the welding ring further comprises two second side walls arranged oppositely, the two second side walls are respectively connected to one of the second side edges and are both arranged to protrude away from the battery cell, and the second side walls are at least partially embedded in the upper plastic sleeve.

5. The roof assembly of claim 4, wherein, Each first side wall comprises a plurality of first sub-walls, the plurality of first sub-walls are arranged at intervals along the first side edge, an anti-rotation opening is formed between two adjacent first sub-walls, and part of the upper plastic sleeve is located in the anti-rotation opening; and / or Each second side wall comprises a plurality of second sub-walls, the plurality of second sub-walls are arranged at intervals along the second side edge, an anti-rotation opening is formed between two adjacent first sub-walls, and part of the upper plastic sleeve is located in the anti-rotation opening.

6. The roof assembly of claim 5, wherein, Each first sub-wall or each second sub-wall comprises a connecting arm and a bending part, the bending part is connected to one end of the connecting arm away from the battery cell and is bent towards the pole, a limiting groove is arranged in the upper plastic sleeve, the limiting groove comprises a first groove body and a second groove body, the second groove body is located at one end of the first groove body away from the cover plate and is in communication with the first groove body, the connecting arm is located in the first groove body, the bending part is located in the second groove body, the first groove body is matched with the connecting arm, and the second groove body is matched with the bending part.

7. The roof assembly of any of claims 1-6, wherein, The pole comprises a first part and a second part, the second part is connected to one side of the first part close to the battery cell, the material of the first part is different from that of the second part, and the thickness of the second part is between 0.5 mm and 5 mm.

8. The roof assembly of claim 7, wherein, The top cover assembly further comprises a connecting piece, the connecting piece comprises a protruding structure, the protruding structure is arranged protruding away from the direction of the battery cell and penetrating the mounting port, the second part comprises a plane facing the battery cell, and the protruding structure is attached to the plane.

9. The roof assembly of claim 8, wherein, The top cover assembly further comprises a sealing ring, the sealing ring is arranged between the connecting piece and the welding ring.

10. A battery, characterized by The battery comprises the top cover assembly of any one of claims 1-9, a battery cell, and a shell, the battery cell is arranged in the shell, the shell is provided with an opening, the top cover assembly is arranged on the opening and connected to the battery cell.

11. An electrical device, characterized by The battery comprises the battery of claim 10.

Images