CN220189782U

CN220189782U - Battery cover plate assembly and cylindrical battery

Info

Publication number: CN220189782U
Application number: CN202320707991.1U
Authority: CN
Inventors: 史志豪; 王传宝; 项海标
Original assignee: Dongguan Liwinon Energy Technology Co ltd
Current assignee: Dongguan Liwinon Energy Technology Co ltd
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-12-15
Anticipated expiration: 2033-04-03

Abstract

The utility model belongs to the technical field of lithium battery manufacturing, and particularly relates to a battery cover plate assembly, which comprises a cover plate, wherein the outer edge of the cover plate is provided with a bulge in a surrounding mode, the bulge protrudes from the inside of a battery to the outside of the battery.

Description

Battery cover plate assembly and cylindrical battery

Technical Field

The utility model belongs to the technical field of lithium battery manufacturing, and particularly relates to a battery cover plate assembly and a cylindrical battery.

Background

With the rapid development of the electronic industry and the information industry, the requirements of people on power supplies of various electric appliances are increasing. Cylindrical lithium ion batteries are used as high-energy power sources in various mobile devices, such as mobile phones, digital cameras, notebook computers, portable electric tools, electronic cigarettes, unmanned aerial vehicles and the like.

The prior cylindrical lithium ion battery generally adopts lap joint type welding between the cover plate and the shell due to the structural design of the battery shell, the outer diameter size of the battery can be increased after welding, and a mechanical polishing procedure is also required to be added so as to dig the laser welding high melting part, thereby greatly increasing the cost.

Disclosure of Invention

One of the objects of the present utility model is: aiming at the defects of the prior art, a battery cover plate assembly and a cylindrical battery containing the battery cover plate assembly are provided, so that the problem that the outer diameter size of the battery can be increased after the conventional cylindrical battery is welded is solved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the battery cover plate assembly comprises a cover plate, wherein a protrusion is arranged on the outer edge of the cover plate in a surrounding mode and used for being welded with the inner wall of a battery shell.

As a more preferable embodiment of the utility model, the protrusion protrudes from the inside of the battery to the outside of the battery, and a rounded corner is provided at the intersection of the bottom of the protrusion and the cover plate.

As a more preferable embodiment of the present utility model, a through hole is provided at the center of the cover plate.

As a more preferred embodiment of the present utility model, it further comprises a post structure, which is sealingly mounted in the through-hole.

As a more preferable embodiment of the present utility model, the post structure includes an insulating member and a protrusion, the insulating member is disposed between the protrusion and the cap plate, and a bottom of the protrusion passes through the insulating member and is disposed in the through hole.

As a more preferable embodiment of the present utility model, a gap is provided between the bottom of the convex portion and the through hole, and the insulator portion is provided in the gap.

As a more preferred embodiment of the present utility model, the pole structure further comprises a sealing nail.

As a more preferable embodiment of the present utility model, the pole structure further includes a sealing cover provided on the cover plate, and the sealing cover covers the sealing nail.

As a more preferable embodiment of the utility model, a cavity is arranged at the center of the sealing cover, and the sealing nail part is accommodated in the cavity.

Another object of the utility model is: the utility model provides a cylinder battery, it includes casing, electric core and foretell battery cover plate subassembly, the electric core sets up the inside of casing, battery cover plate subassembly is sealed the opening of casing, just protruding with the inside wall butt of casing.

The battery cover plate assembly and the cylindrical battery comprising the battery cover plate assembly have the beneficial effects that the outer edge of the cover plate of the battery cover plate assembly is provided with the protrusions in a surrounding manner, the protrusions are used for being welded with the inner wall of the battery shell, the outer diameter of the battery is not increased after welding, the structure is simple, the cost is low, and the space inside the battery is not occupied.

Secondly, the bottom of apron is provided with the fillet, the fillet is protruding to the inside of battery, flattens apron and casing terminal surface through the tool, adopts laser welding to fix apron and casing afterwards, can promote welding efficiency widely. Meanwhile, the cover plate is welded by the embedded laser, so that the outer diameter of the battery is not increased, the internal space of the battery can be increased, the capacity of the battery is increased, the welding melting high planing process can be reduced in the manufacturing process, and the cost is saved.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 6.

FIG. 1 is a schematic view of the overall structure of a positive electrode cover plate of the present utility model;

FIG. 2 is a schematic view of the overall structure of the negative electrode cover plate of the present utility model;

FIG. 3 is an overall schematic view of a pole structure of the present utility model;

FIG. 4 is a schematic view of another embodiment of a post according to the present utility model;

FIG. 5 is a schematic view showing the overall structure of the cylindrical battery of the present utility model;

fig. 6 is a cross-sectional view showing the overall structure of the cylindrical battery of the present utility model.

In the figure: 1. a positive electrode cover plate; 11. a protrusion; 12. round corners; 13. a through hole; 131. a first through hole; 132. a second through hole; 15. an insulating member; 16. a convex portion; 161. a small pole;

2. a negative electrode cover plate; 21. sealing nails; 22. sealing cover; 221. a cavity;

3. a housing;

4. and a battery cell.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present utility model, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present utility model, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present utility model, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present utility model, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

In the description of the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 6, but the present utility model is not limited thereto.

As shown in fig. 1, an embodiment of the present utility model provides a battery cover assembly, which includes a cover, and a protrusion 11 is circumferentially provided at an outer edge of the cover, and the protrusion 11 protrudes from an inside of a battery to an outside of the battery, and is used for welding with an inner wall of a battery case.

Specifically, the cover plate assembly in the embodiment of the utility model comprises a positive electrode cover plate 1 and a negative electrode cover plate 2, wherein the positive electrode cover plate 1 and the negative electrode cover plate 2 are arranged at openings at two ends of a battery shell 3, one side of the positive electrode cover plate 1 is connected with the positive electrode end face of a winding core, and one side of the negative electrode cover plate 2 is connected with the negative electrode end face of the winding core.

As shown in fig. 1, as a more preferable embodiment of the present utility model, a rounded corner 12 is provided at the intersection of the bottom of the protrusion 11 and the cover plate, and the rounded corner 12 protrudes toward the inside of the battery.

Specifically, the anode cover plate 1 and the cathode cover plate 2 are made of stainless steel plates, a circle of protrusions 11 are arranged at the edge of the stainless steel plates, the protrusions 11 extend along one direction of the upper side and the lower side of the stainless steel plates, round corners 12 are arranged at the starting points of the protrusions 11, namely the intersections of the protrusions 11 and the stainless steel plates, and the diameters of the round corners 12 are 1-3 mm, specifically 1mm, 1.2mm, 1.5mm, 1.7mm, 2.0mm, 2.2mm, 2.5mm, 2.7mm or 3mm.

Specifically, the cover plate component is formed by machining or integrally stamping a stainless steel sheet, and after the machining is finished, the stainless steel sheet needs to be subjected to nickel plating treatment.

Further, the outer diameter of the stainless steel sheet shown in fig. 1 and 2 is larger than or equal to the inner diameter of the opening of the housing 3.

As a more preferred embodiment of the utility model, the cover plate is provided with a through hole 13 at its center.

Specifically, the center of the positive electrode cover plate 1 and the center of the negative electrode cover plate 2 are respectively provided with a through hole 13, namely a first through hole 131 and a second through hole 132, the first through hole 131 is used for conveniently installing the pole structure, and the second through hole 132 has two functions, namely, the convenience of adding electrolyte when assembling the battery, and the convenience of installing the pole structure after the electrolyte is added.

As shown in fig. 2, the second through hole 132 has a smaller diameter than the first through hole 131.

As shown in fig. 3, as a more preferable embodiment of the present utility model, a post structure is further included, which is hermetically mounted in the through hole 13.

Specifically, the pole structure is in sealing connection with the cover plate assembly through the through hole 13, so that electrolyte in the battery can be prevented from leaking.

As shown in fig. 3, as an embodiment of the present utility model, the post structure includes an insulating member 15 and a protruding portion 16, the insulating member being disposed between the protruding portion 16 and the positive electrode cap plate 1, the bottom portion of the protruding portion 16 being disposed in the through hole 13 through the insulating member.

Specifically, the pole structure includes a protrusion 16 and an insulating member 15, a small pole 161 is provided at the center of the protrusion 16, a through hole 13 is provided at the center of the insulating member 15, and the small pole 161 in the protrusion 16 is provided on one side of the insulating member 15 through the through hole 13 in the insulating member 15.

Further, the thickness of the insulating member 15 is more than 0.05m, the pole piece is manufactured by adopting an aluminum alloy material machine or a die for stamping, surface passivation treatment is needed after the machining is completed, the passivation film covers the outer surface of the whole pole piece, the diameter of the small pole 161 is 1-5 mm, specifically 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm and 4.5mm, and the diameter of the pole piece is larger than the diameter of the small pole 161 by 2-5 mm, specifically 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm. And the diameter of the pole piece is smaller than the diameter of the cover plate component by more than 0.5 mm.

Specifically, a gap is provided between the small post 161 and the first through hole 131, the insulating member 15 is partially disposed in the gap, a part of the insulating member 15 is disposed between the protruding portion 16 and the positive electrode cover plate 1, and a part of the insulating member fills the gap, so that a better sealing effect can be generated.

As shown in fig. 3, a stainless steel sheet, an insulating member 15 and a convex portion 16 are sequentially placed in a composite jig, and three components are composited together by heating and pressurizing to manufacture the composite positive electrode cover plate 1.

As shown in fig. 4, as another embodiment of the pole component of the present utility model, the pole structure further includes a sealing nail 21, specifically, a sealing cover 22 is disposed on one side of the sealing nail 21, the sealing cover 22 is disposed on the negative electrode cover plate 2, the sealing cover 22 covers the sealing nail 21, a cavity is disposed in the center of the sealing cover 22, and the sealing nail 21 is partially accommodated in the cavity.

Specifically, in this embodiment, the sealing nail 21 includes a nail seat and a nail tip, the nail tip is conical, and the diameter of the nail seat is larger than the diameter of the second through hole 132, so that the sealing effect can be achieved, and the installation and the taking can be facilitated.

Specifically, set up the cavity on the sealed lid 22 and just cover the nail seat of sealed nail 21, can promote the leakproofness between utmost point post structure and the apron structure, and the diameter of nail seat is about to be less than the diameter of apron subassembly, and the cavity on the sealed lid 22 is circular and is greater than the diameter 1mm of nail seat.

Specifically, the sealing nail 21 is made of one or more acid and alkali resistant materials selected from ethylene propylene diene monomer, fluororubber, PP or polytetrafluoroethylene.

As shown in fig. 5 and 6, the utility model also discloses a cover plate assembly for a battery and a cylindrical battery thereof, which comprises a shell 3, a battery cell 4 and the cover plate assembly, wherein the battery cell 4 is arranged in the shell 3, the cover plate assembly seals an opening of the shell 3, the bulge 11 is abutted with the inner side wall of the shell 3, the shell 3 is a stainless steel cylinder with two open ends, the wall thickness of the shell 3 is between 0.1 and 0.3mm, and the cover plate assembly is arranged at the openings at the two ends of the shell 3 through laser welding.

Specifically, the winding core is formed by winding positive and negative pole pieces and isolating films, positive pole lugs and negative pole lugs are respectively led out from two ends of the winding core, the positive and negative pole lugs are arranged at an included angle with the surface of the winding core, the positive pole lugs are formed by aluminum, and the negative pole lugs are copper, nickel or copper nickel plating lugs.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. A battery cover plate assembly, characterized in that: the battery cover comprises a cover plate, wherein a bulge is arranged on the outer edge of the cover plate in a surrounding manner and is used for being welded with the inner wall of the battery shell;

a through hole is formed in the center of the cover plate;

the pole structure is hermetically arranged in the through hole;

the pole structure comprises an insulating part and a convex part, wherein the insulating part is arranged between the convex part and the cover plate, and the bottom of the convex part penetrates through the insulating part and is arranged in the through hole.

2. A battery cover assembly as defined in claim 1, wherein: the protrusion protrudes from the inside of the battery to the outside of the battery, and a fillet is arranged at the intersection of the bottom of the protrusion and the cover plate.

3. A battery cover assembly as defined in claim 1, wherein: a gap is provided between the bottom of the protruding portion and the through hole, and the insulator portion is provided in the gap.

4. A battery cover assembly as defined in claim 1, wherein: the post structure further includes a sealing nail.

5. A battery cover assembly as defined in claim 4, wherein: the pole structure further comprises a sealing cover, wherein the sealing cover is arranged on the cover plate, and the sealing cover covers the sealing nails.

6. A battery cover assembly as defined in claim 5, wherein: the center of the sealing cover is provided with a cavity, and the sealing nail part is accommodated in the cavity.

7. A cylindrical battery characterized in that: the battery cover plate assembly comprises a shell, a battery core and the battery cover plate assembly according to any one of claims 1-6, wherein the battery core is arranged in the shell, the battery cover plate assembly seals the opening of the shell, and the protrusion is abutted with the inner side wall of the shell.