CN220914394U

CN220914394U - Battery top cover structure and battery

Info

Publication number: CN220914394U
Application number: CN202322353327.4U
Authority: CN
Inventors: 朱坤庆
Original assignee: Guangzhou Rongjie Energy Technology Co ltd
Current assignee: Guangzhou Rongjie Energy Technology Co ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-05-07
Anticipated expiration: 2033-08-31

Abstract

The utility model belongs to the technical field of batteries, and in particular relates to a battery top cover structure and a battery, wherein the battery top cover structure comprises: the cover plate is provided with at least one mounting hole; a fitting including a first connection layer and a second connection layer, the first connection layer and the second connection layer being disposed on the cover plate in a thickness direction of the cover plate, and the second connection layer being connected to an inside of the first connection layer; the assembly part is internally provided with an assembly hole, and the assembly hole penetrates through the first connecting layer and the second connecting layer; a pole body; one end of the pole body penetrates into the assembly hole and is connected with the second connecting layer. The utility model can improve the assembly stability of the pole body, avoid the phenomena of falling off and the like of the pole body, the phenomena of cold joint and the like during welding, and can also effectively ensure the mechanical property, the sealing property and the reliability of the internal resistance of the pole body.

Description

Battery top cover structure and battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery top cover structure and a battery.

Background

Currently, with the increasing miniaturization, portability and portability of electronic products, such as video cameras, notebooks, and mobile phones, etc. The drive power supply of these electronic products is also being developed toward high capacity, high safety, and portability. However, lithium batteries are widely used in these electronic products because of their excellent characteristics such as high capacity.

However, the negative pole of most of the existing batteries has the risk of poor falling off of individual copper-aluminum friction welding in the friction welding process, so that the phenomena of short circuit and the like occur, and the use safety is reduced; or in the process of directly riveting and welding the copper pole of the battery with the riveting block (aluminum plate), the cold welding phenomenon can occur, so that the internal resistance of the battery is increased; and further, the heat generation capacity of the battery is improved, the use power is reduced, and the use safety is reduced.

Disclosure of utility model

The utility model aims at: aiming at the defects of the prior art, a battery top cover structure and a battery are provided to solve the problem of lower safety of the existing use.

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

a battery top cover structure, comprising:

the cover plate is provided with at least one mounting hole;

A fitting including a first connection layer and a second connection layer, the first connection layer and the second connection layer being disposed on the cover plate in a thickness direction of the cover plate, and the second connection layer being connected to an inside of the first connection layer; the assembly part is internally provided with an assembly hole, and the assembly hole penetrates through the first connecting layer and the second connecting layer;

A pole body; one end of the pole body penetrates into the assembly hole and is connected with the second connecting layer.

Preferably, the first connection layer is an aluminum material layer; the second connecting layer is a copper material layer; or the first connecting layer is a copper material layer, and the second connecting layer is an aluminum material layer.

Preferably, the material of the pole body is the same as the material of the second connection layer.

Preferably, the second connection layer includes a main body portion and a connection portion connected to each other; the first connecting layer is arranged between the main body part and the connecting part, and the assembly hole is arranged in the connecting part;

And the pole body is adjacent to the connecting part, and the top end of the pole body is leveled with one end of the connecting part and the upper surface of the first connecting layer.

Preferably, a limiting bump is arranged in the second connecting layer, and the limiting bump is arranged from the second connecting layer towards the assembly hole; and the pole body is provided with a mounting groove assembled with the limit lug.

Preferably, the pole body comprises a pole body base and a pole body connecting part which are mutually perpendicular; and the pole connecting part is connected in the assembly hole, and the mounting groove is arranged on the side wall of the pole connecting part.

Preferably, the battery top cover structure further comprises a sealing ring, wherein the sealing ring is arranged between the cover plate and the pole body and is connected in the assembly hole.

Preferably, the battery top cover structure further comprises an insulating connector; the insulating connecting piece is positioned at the opening of the mounting hole and is arranged on the cover plate; the insulating connecting piece is provided with a containing cavity; the first connecting layer and the second connecting layer are respectively positioned in the accommodating cavity.

Preferably, the battery top cover structure further comprises an insulating inner plate; the insulating inner plate is connected to the bottom of the cover plate.

The utility model also provides a battery, which comprises the battery top cover structure.

The utility model has the beneficial effects that the second connecting layer of the assembly part is assembled with the pole body, so that a better molten pool can be formed when the second connecting layer is assembled with the pole body in a welding way, the assembly stability of the pole body can be improved, the phenomena of falling off and the like of the pole body and the phenomena of cold welding and the like during welding are avoided, and the mechanical property, the sealing property and the reliability of the internal resistance of the pole body can be effectively ensured; besides, the composite material structure formed by the first connecting layer and the second connecting layer can improve the assembly stability between the assembly part and the pole column body, the cover plate and other parts respectively, so that the use tightness and the safety of the cover plate can be ensured.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 5.

Fig. 1 is a schematic view of a battery top cover structure according to an embodiment of the utility model;

FIG. 2 is an exploded view of a battery top cover structure according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a battery top cover structure according to an embodiment of the present utility model;

FIG. 4 is an enlarged view of a portion of a battery top cover structure according to an embodiment of the present utility model;

Fig. 5 is a schematic view of a pole body of a battery top cover structure according to an embodiment of the utility model.

In the figure: 1-a cover plate; 11-mounting holes; 2-fitting; 21-a first connection layer; 22-a second connection layer; 221-a main body portion; 222-connection; 223-limit bump; 23-fitting holes; 3-pole body; 301-positive electrode posts; 302-a negative electrode column; 31-pole base; 32-pole connection; 321-a first connection block; 322-a second connection block; 323-a third connection block; 4-insulating connectors; 6-insulating inner plates; 7-explosion-proof holes; 8-a liquid injection hole; 9-sealing rings.

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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application 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 application, 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 application, 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 application. 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 application, the term "and/or" is merely a relationship between a battery top cover structure and a battery description association object, which indicates that three relationships may exist, for example, a and/or B may indicate that: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front-rear associated object is a battery top cover structure and a battery or relationship.

In the description of the embodiments of the present application, 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 application, 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 application.

In the description of the embodiments of the present application, 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 application 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 5, but the present utility model is not limited thereto.

As shown in fig. 1, 2 and 3, in one embodiment of the present utility model, the battery top cover structure; comprises a cover plate 1, a fitting 2 and a pole body 3; the cover plate 1 is provided with at least one mounting hole 11; the fitting 2 includes a first connection layer 21 and a second connection layer 22, the first connection layer 21 and the second connection layer 22 are provided on the cover plate 1 along the thickness direction of the cover plate 1 inside, and the second connection layer 22 is connected to the inside of the first connection layer 21; fitting holes 23 are provided in the fitting 2, and the fitting holes 23 penetrate the first connection layer 21 and the second connection layer 22.

According to the technical scheme, the second connecting layer of the assembly part is assembled with the pole body, so that a better molten pool can be formed when the second connecting layer is assembled with the pole body in a welding way, the assembly stability of the pole body can be improved, the phenomena of falling off and the like of the pole body and the phenomena of cold welding and the like during welding are avoided, and the mechanical property, the sealing property and the reliability of the internal resistance of the pole body can be effectively ensured; besides, the composite material structure formed by the first connecting layer and the second connecting layer can improve the assembly stability between the assembly part and the pole column body, the cover plate and other parts respectively, so that the use tightness and the safety of the cover plate can be ensured.

Wherein the material of the pole body 3 is the same as the material of the second connection layer 22. By using the same material between the second connection layer of the fitting and the pole body, can form a better molten pool when the second connecting layer is assembled with the pole body in a welding way, thereby improving the assembling stability of the pole body, the phenomena of falling off and the like of the pole body and the phenomena of cold joint and the like during welding are avoided, and the mechanical property, the sealing property and the reliability of the internal resistance of the pole body can be effectively ensured.

In some embodiments, as shown in fig. 1, the number of the mounting holes 11 is two, and the mounting holes are arranged in a thickness direction penetrating through the cover plate 1; the pole body 3 comprises a negative pole body 302 and a positive pole body 301; the negative electrode post 302 and the positive electrode post 301 are respectively connected to the inside of the two different mounting holes 11. This structure can improve the stability of the assembly of the negative electrode post 302 and the positive electrode post 301, and achieve reasonable use of the spatial position on the cap plate 1.

Specifically, in some of these embodiments, as shown in fig. 3, the first connection layer 21 is an aluminum material layer; the second connection layer 22 is a copper material layer. Wherein, the negative pole 302 is a copper negative pole, and one end of the copper negative pole penetrates into the corresponding assembly hole 23 and is connected with the second connection layer 22; the other end of the negative pole column made of copper material is connected with the electrode lug of the battery cell. Wherein, the aluminum material layer and the copper material layer are formed into a whole by punching and compounding. The structure utilizes the good ductility stamping of copper, after the copper/aluminum composite board is adopted for forming, the copper material extends to form the assembly hole 23, and the assembly hole 23 covers the pole body 3, so that the assembly stability and the tightness between the copper/aluminum composite board and the cover plate 1 and the pole body 3 respectively can be improved, and the copper/aluminum composite board can replace the current friction welding process, so that the cost of a structure is reduced; meanwhile, a good molten pool can be formed by welding the copper material layer and the negative electrode column of the copper material; further, the problem of pole falling is solved, and reliability of pole mechanics, sealing and internal resistance is guaranteed; besides, the aluminum material layer is welded and assembled with the parts after the top cover structure, so that the assembly contact area is increased, and the welding stability can be ensured.

Specifically, in other embodiments, as shown in fig. 3, the first connection layer 21 is a copper material layer, and the second connection layer 22 is an aluminum material layer. At this time, the electrode column 3 is the positive electrode column 301; the other end of the positive post 301 is used for connecting to an aluminum sheet which is used for connecting to the tab of the cell.

Specifically, in some embodiments, as shown in fig. 4, the second connection layer 22 includes a main body portion 221 and a connection portion 222 connected to each other; and the first connection layer 21 is disposed between the body part 221 and the connection part 222, and the fitting hole 23 is disposed inside the connection part 222; and the pole body 3 is adjacent to the connection portion 222, and the top end of the pole body 3 is flush with one end of the connection portion 222 and the upper surface of the first connection layer 221. Wherein the main body 221 and the connection portion 222 form a second connection layer 22 having a T-shaped cross section; the first connection layer 21 is connected to an upper end side of the second connection layer 22 having a T-shaped cross section. The second connecting layer 22 with the T shape can improve the assembly stability of the first connecting layer 21 and the second connecting layer 22, and improve the use safety of the top cover structure.

Specifically, in some embodiments, as shown in fig. 4, a limiting bump 223 is disposed in the connection portion 222 in the second connection layer 22, and the limiting bump 223 is disposed to protrude from the second connection layer 22 toward the assembly hole 23; the pole body 3 is provided with a mounting groove assembled with the limit bump 223. Because the pole body 3 has certain elasticity in nature, therefore the one end of pole body 3 strides limit bump 223 to make limit bump 223 set up in the mounting groove, improve the stability of assembly, the one end of pole body 3 is welded as an organic wholely with second tie coat 22 through the soldered connection again.

Specifically, in some embodiments, as shown in fig. 4 and 5, the pole body 3 includes a pole base 31 and a pole connecting portion 32 disposed perpendicular to each other; and the pole connection portion 32 is connected to the inside of the fitting hole 23, and the mounting groove is provided on the side wall of the pole connection portion 32. Wherein, in some embodiments, as shown in fig. 5, the pole connection part 32 includes a first connection block 321, a second connection block 322, and a third connection block 323; two ends of the second connection block 322 are respectively connected with the first connection block 321 and the third connection block 323, and a mounting groove is formed among the first connection block 321, the second connection block 322 and the third connection block 323; the first connection block 321 is connected to the pole base 31.

Specifically, in some embodiments, as shown in fig. 2 and 3, the battery top cover structure further includes a sealing ring 9, and the sealing ring 9 is disposed between the cover plate 1 and the pole body 3 and is connected in the assembly hole 23. The structure adds the assembly gap between the upper cover plate 1 and the pole body 3 through the sealing ring, so that the sealing performance of the top cover structure is improved, and the use safety is improved.

Specifically, in some embodiments, as shown in fig. 2 and 3, the cover plate 1 is provided with explosion-proof holes 7; the explosion-proof hole 11 is used for installing an explosion-proof valve; the opening of the explosion-proof hole 11 is used for installing an explosion-proof membrane. The explosion-proof hole 11 is arranged, so that the pressure in the battery cell with abnormal use can be quickly adjusted and relieved, and the use safety is improved; and then through the separation protection effect of the explosion-proof membrane on the explosion-proof valve, the corrosion damage of foreign matters to the explosion-proof valve can be avoided, so that the service life of the explosion-proof valve is prolonged. Wherein, the cover plate 1 is also provided with a liquid injection hole 8; the liquid injection hole 8 is used for injecting electrolyte.

Specifically, in some embodiments, as shown in fig. 1 and 2, the battery top cover structure further includes an insulating connector 4 and an insulating inner plate 6; the insulating connecting piece 4 and the insulating inner plate 6 are oppositely arranged on the end surfaces of the two sides of the cover plate 1; and the insulating connecting piece 4 is positioned at the inlet of the mounting hole 11 and is connected to the cover plate 1; the insulating inner plate 6 is connected to the bottom of the cover plate 1 and is communicated with the mounting hole 11; the insulating connecting piece is provided with a containing cavity; the first and second connection layers 21 and 22 are located in the receiving cavities, respectively. Through the separation insulating effect of insulating connecting piece 4 and insulating inner panel 6 from the upper and lower both ends of apron 1, can avoid the phenomenon such as taking place short circuit between apron 1 and pole body 3 or the assembly part, improve the safety in utilization. Wherein, the insulating connecting piece 4 is provided with a connecting groove, and the first connecting layer 21 and the second connecting layer 22 are clamped in the connecting groove; and the top of the first connection layer 21 is welded to the insulating connector 4 as one body.

The utility model also provides a battery, which comprises a battery top cover structure, and the specific structure of the battery top cover structure refers to the embodiment, and because the battery adopts all the technical schemes of all the embodiments, the battery at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.

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 top cap structure, its characterized in that: comprising the following steps:

the cover plate is provided with at least one mounting hole;

2. The battery top cover structure according to claim 1, wherein: the first connecting layer is an aluminum material layer; the second connecting layer is a copper material layer;

Or the first connecting layer is a copper material layer, and the second connecting layer is an aluminum material layer.

3. The battery top cover structure according to claim 1 or 2, wherein: the pole body is made of the same material as the second connecting layer.

4. The battery top cover structure according to claim 1, wherein: the second connecting layer comprises a main body part and a connecting part which are connected with each other; and the first connection layer is arranged between the main body part and the connection part;

5. The battery top cover structure according to claim 1 or 4, wherein: a limiting lug is arranged in the second connecting layer and is arranged from the second connecting layer towards the assembly hole; and the pole body is provided with a mounting groove assembled with the limit lug.

6. The battery top cover structure according to claim 5, wherein: the pole body comprises a pole body base and a pole body connecting part which are arranged vertically; and the pole connecting part is connected in the assembly hole, and the mounting groove is arranged on the side wall of the pole connecting part.

7. The battery top cover structure according to claim 1, wherein: the battery top cover structure further comprises a sealing ring, wherein the sealing ring is arranged between the cover plate and the pole body and is connected in the assembly hole.

8. The battery top cover structure according to claim 1, wherein: the battery top cover structure further comprises an insulating connecting piece; the insulating connecting piece is positioned at the opening of the mounting hole and is arranged on the cover plate; the insulating connecting piece is provided with a containing cavity; the first connecting layer and the second connecting layer are respectively positioned in the accommodating cavity.

9. The battery top cover structure according to claim 1, wherein: the battery top cover structure further comprises an insulating inner plate; the insulating inner plate is connected to the bottom of the cover plate.

10. A battery, characterized in that: a battery top cover structure comprising any one of the preceding claims 1 to 9.