CN218731652U

CN218731652U - Small-sized battery

Info

Publication number: CN218731652U
Application number: CN202222862093.1U
Authority: CN
Inventors: 胡省辉; 卜芳; 王自霞; 冯彪; 李桂平
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-03-24
Anticipated expiration: 2032-10-28

Abstract

The application provides a small-size battery forms connecting portion at the internal face of lid to connect anodal ear or negative pole ear in connecting portion, thereby anodal ear or negative pole ear can not be pressed from both sides between casing and lid, consequently at the in-process that utilizes laser welding casing and lid, and anodal ear or negative pole ear can not lead to the fact the hindrance to the transmission of laser, thereby can guarantee casing and lid welding department's penetration uniformity, with improvement welding strength. Therefore, even if gas is generated in the small battery due to short circuit, the cover body cannot be easily broken to damage the application environment, and the safety performance of the small battery is improved.

Description

Small-sized battery

Technical Field

The utility model belongs to the technical field of the battery, especially, relate to a small-size battery.

Background

Small batteries are widely used in various aspects of life, particularly in small portable electronic devices such as electronic watches, bluetooth headsets, hearing aids, and the like. In the related art small battery, the negative tab is usually directly connected to the case, but in the subsequent process of laser welding the cover and the case, the negative tab may obstruct the transmission of laser, which causes the consistency of the penetration of the cover and the case at the welding position to be poor, resulting in the reduction of welding strength, so that when gas is generated in the battery due to short circuit, the cover is easily broken under the action of air pressure, and the potential safety hazard of the small battery is increased.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a small-size battery to solve the great problem of current small-size battery potential safety hazard.

An embodiment of the present application provides a small-sized battery, including:

the device comprises a shell, a bearing, a connecting piece and a clamping piece, wherein an installation cavity is arranged in the shell, an opening end is formed in the shell, and the opening end is communicated with the installation cavity;

the cover body is arranged at the opening end in a covering mode, the cover body is provided with an installation hole communicated with the installation cavity, and a connecting part is convexly arranged on the wall surface of the cover body facing the installation cavity;

the pole is mounted in the mounting hole and is arranged in an insulating manner with the cover body;

the winding core is arranged in the mounting cavity and comprises a positive plate, a diaphragm and a negative plate which are stacked and wound, the positive plate is connected with a positive tab, and the negative plate is connected with a negative tab; one of the positive electrode tab and the negative electrode tab is connected to the electrode post, and the other is connected to the connecting portion.

Optionally, the mounting hole is opened at the axis of the cover body, and the connecting portion is close to the edge of the cover body.

Optionally, the connecting portion extends along a circumferential direction of the cover body.

Optionally, the connecting portion is welded and fixed to the peripheral wall of the housing.

Optionally, the connecting portion is formed by partially recessing the cover body, and a recessing direction of the connecting portion is from outside the mounting cavity toward inside the mounting cavity.

Optionally, the positive tab or the negative tab is connected to a surface of the connecting portion facing away from the circumferential wall of the housing.

Optionally, the positive tab or the negative tab is welded and fixed to the connection portion.

Optionally, the cover body is further provided with a liquid injection hole, and the small-sized battery further comprises a sealing element for plugging the liquid injection hole.

Optionally, the two ends of the axial direction of the winding core are provided with insulating surface pads.

Optionally, the positive tab and the negative tab are respectively located on two opposite sides of the axis of the winding core.

The small-size battery that this application embodiment provided forms connecting portion at the internal face of lid to connect anodal ear or negative pole ear in connecting portion, thereby anodal ear or negative pole ear can not be pressed from both sides between casing and lid, consequently at the in-process that utilizes laser welding casing and lid, and anodal ear or negative pole ear can not lead to the fact the hindrance to the transmission of laser, thereby can guarantee casing and lid welding department's penetration uniformity, with improvement welding strength. Therefore, even if gas is generated in the small battery due to short circuit, the cover body cannot be easily broken to damage the application environment, and the safety performance of the small battery is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can also be derived from them without inventive effort.

For a more complete understanding of the present application and its advantages, reference is now made to the following descriptions taken in conjunction with the accompanying drawings. Wherein like reference numerals refer to like parts in the following description.

Fig. 1 is a schematic structural diagram of a small battery provided in an embodiment of the present application.

Fig. 2 is a schematic cross-sectional view of a small-sized battery provided in an embodiment of the present application.

10. A housing; 11. a mounting cavity; 20. a cover body; 21. a connecting portion; 30. a pole column; 40. a winding core; 41. a positive tab; 42. a negative tab; 22. a liquid injection hole; 50. and a seal.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Small batteries are widely used in various aspects of life, particularly in small portable electronic devices such as electronic watches, bluetooth headsets, hearing aids, and the like. In the related art small battery, the negative tab 42 is usually directly connected to the case 10, but in the subsequent process of laser welding the lid 20 and the case 10, the negative tab 42 may obstruct the transmission of laser, which causes the consistency of the penetration depth of the lid 20 and the case 10 at the welding position to be poor, and the welding strength to be reduced, so that when gas is generated in the battery due to short circuit, the lid 20 is easily broken under the action of air pressure, and the potential safety hazard of the small battery is increased.

The embodiment of the application provides a small-size battery to solve the great problem of current small-size battery potential safety hazard. Which will be described below with reference to the accompanying drawings. The small-sized battery provided by the embodiment of the application can be applied to electronic equipment. For example, please refer to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a small battery provided in an embodiment of the present application. Fig. 2 is a schematic cross-sectional view of a small-sized battery provided in an embodiment of the present application.

The small-sized battery includes: the device comprises a shell 10, wherein a mounting cavity 11 is arranged in the shell 10, an opening end is arranged on the shell 10, and the opening end is communicated with the mounting cavity 11; the cover body 20 is arranged at the opening end of the shell 10 in a covering manner, the cover body 20 is provided with an installation hole communicated with the installation cavity 11, and a connecting part 21 is convexly arranged on the wall surface of the cover body 20 facing the installation cavity 11; the pole post 30 is mounted in the mounting hole and is insulated from the cover body 20; the winding core 40 is installed in the installation cavity 11, the winding core 40 comprises a positive plate, a diaphragm and a negative plate which are stacked and wound, the positive plate is connected with a positive tab 41, and the negative plate is connected with a negative tab 42; one of the positive electrode tab 41 and the negative electrode tab 42 is connected to the electrode post 30, and the other is connected to the connection portion 21.

In this embodiment, the housing 10 may be cylindrical and opened at the top, and the housing 10 is made of a conductive material, such as stainless steel. The cover 20 may be provided in a circular shape to fit the shape of the case 10; the material of the cover 20 may be the same as the case 10 to achieve electrical conduction between the case 10 and the cover 20. The case 10 and the cover 20 may be fixed by laser welding. The pole 30 and the wall of the mounting hole can be insulated by an insulating layer, so that the winding core 40 and the cover body 20 are insulated. One end of the pole 30 is connected with the positive pole tab 41 or the negative pole tab 42 in the mounting cavity 11, and the other end is used for connecting with an electric circuit outside the mounting cavity 11. Taking the case where the positive tab 41 is connected to the pole post 30 and the negative tab 42 is connected to the connector 21, the positive electrode of the power consumption circuit can be connected to the pole post 30, and the negative electrode can be connected to any position of the lid 20 or the case 10, so that a current loop is formed between the winding core 40 and the power consumption circuit.

The connection portion 21 is used for connecting the positive tab 41 or the negative tab 42, so that when the positive tab 41 or the negative tab 42 is connected, the positive tab 41 or the negative tab 42 does not need to be clamped between the cover body 20 and the casing 10, and thus, the connection stability of the positive tab 41 or the negative tab 42 and the cover body 20 can be ensured, the influence of the positive tab 41 or the negative tab 42 on the laser welding process of the cover body 20 and the casing 10 can be avoided, the fusion depth consistency of the cover body 20 and the casing 10 at the welding position can be ensured, and the welding strength can be ensured. When gas is generated in the small battery due to a short circuit, since the cover 20 and the case 10 have sufficient connection strength, the cover 20 is not easily broken by gas pressure, and thus damage to the application environment of the small battery can be prevented. The cover 20 or the housing 10 may be provided with a pressure relief groove through which air pressure can be relieved, so that the risk of the cover 20 and the housing 10 being exploded away can be further reduced.

In the small-sized battery provided in the embodiment of the present application, the connection portion 21 is formed on the inner wall surface of the lid body 20, and the positive electrode tab 41 or the negative electrode tab 42 is connected to the connection portion 21, so that the positive electrode tab 41 or the negative electrode tab 42 is not sandwiched between the case 10 and the lid body 20, and therefore, in the process of laser welding the case 10 and the lid body 20, the positive electrode tab 41 or the negative electrode tab 42 does not obstruct transmission of laser, and thus, the penetration consistency of the welding position between the case 10 and the lid body 20 can be ensured, and the welding strength can be improved. Therefore, even if gas is generated in the small battery due to a short circuit, the cover 20 is not easily broken to damage the application environment, thereby improving the safety of the small battery.

The connecting portion 21 and the terminal post 30 may be close to each other or distant from each other. For example, as shown in fig. 2, the mounting hole is opened at the axial center of the cover 20, and the connecting portion 21 is disposed near the edge of the cover 20. The position of the mounting hole, i.e. the position of the pole 30, the axial center of the cover 20, i.e. the center of the cover 20, the pole 30 is arranged at the axial center of the cover 20, and the connecting part 21 is arranged at the edge of the cover 20, so that the distance between the pole 30 and the connecting part 21 can be effectively increased, and the distance between the tail ends of the positive pole tab 41 and the negative pole tab 42 can be increased, so as to avoid the mutual contact short circuit between the positive pole tab 41 and the negative pole tab 42.

The connecting portion 21 may be columnar, block-shaped, or annular. For example, as shown in fig. 2, the connection portion 21 extends along the circumferential direction of the cover 20, that is, the connection portion 21 is annular and extends along the circumferential edge of the cover 20, so that the available connection area of the connection portion 21 can be increased to reduce the difficulty of connecting the positive tab 41 or the negative tab 42 with the connection portion 21. Specifically, the positive tab 41 or the negative tab 42 is welded and fixed to the connection portion 21, so that the difficulty in connecting the positive tab 41 or the negative tab 42 to the connection portion 21 is reduced, and the connection stability is improved.

The welding position between the cover 20 and the housing 10 may be the edge of the cover 20 welded and fixed to the opening end of the housing 10, or may be the connection portion 21 welded and fixed to the peripheral wall of the housing 10, which is not limited herein. It is only necessary that the opening of the housing 10 can be effectively sealed after the cover 20 and the housing 10 are welded. In combination with the embodiment in which the connection portion 21 extends along the circumferential direction of the cover 20, one surface of the connection portion 21 facing the circumferential wall of the housing 10 can be welded and fixed to the circumferential wall of the housing 10, so that the welding area between the cover 20 and the housing 10 can be increased, and the welding strength can be further improved.

The connection portion 21 may be additionally connected to the cover body 20, or may be integrally formed with the cover body 20. Illustratively, as shown in fig. 2, the connecting portion 21 is formed by partially recessing the cover 20, and the recessing direction of the connecting portion 21 is from outside the mounting cavity 11 to inside the mounting cavity 11, that is, the connecting portion 21 can be formed by stamping the cover 20, so that the material of the connecting portion 21 can be saved, and the processing procedure of the connecting portion 21 can be simplified.

Positive electrode tab 41 or negative electrode tab 42 may be connected to the surface of connector 21 facing the bottom of case 10, or may be connected to another position of connector 21. Illustratively, as shown in fig. 2, the positive tab 41 or the negative tab 42 is connected to a surface of the connection portion 21 facing away from the peripheral wall of the housing 10. In the embodiment in which the connection portion 21 is welded and fixed to the peripheral wall of the lid 20, the connection portion 21 is annular, the peripheral wall of the case 10 is welded and fixed to the peripheral wall of the connection portion 21, and the positive electrode tab 41 or the negative electrode tab 42 is welded and fixed to the inner peripheral wall of the connection portion 21, whereby the influence of the positive electrode tab 42 or the negative electrode tab 42 on the welding effect between the case 10 and the connection portion 21 can be reduced.

In the case of manufacturing a small-sized battery, after the winding core 40 is packaged, the mounting cavity 11 needs to be filled with an electrolyte solution, which can be filled through the injection hole 22 provided in the case 10 or the lid body 20. Illustratively, as shown in fig. 1 and 2, the lid 20 further has a liquid pouring hole 22, and the small-sized battery further includes a sealing member 50 for sealing the liquid pouring hole 22. The pouring hole 22 is provided in the lid body 20, and the attachment hole, the connecting portion 21, and the pouring hole 22 can be collectively processed in the process of processing the lid body 20, so that the case 10 does not need to be processed, and the entire process of processing the small-sized battery can be simplified. After filling with electrolyte, the filling opening 22 is then closed by a seal 50 to ensure a complete seal of the installation space 11.

When the winding core 40 is mounted, it is to be avoided that both ends of the winding core 40 contact the case 10 or the cover 20 to cause a short circuit. Illustratively, the winding core 40 is provided with insulating surface pads (not shown) at both ends in the axial direction. The winding core 40 may be fixed on the bottom wall of the can 10 with an insulating gap formed between the peripheral wall of the winding core 40 and the peripheral wall of the can 10. The insulating surface pad is made of insulating materials, such as a CPP film (casting polypropylene film), a PPA film (polyphthalamide), a modified PP film (polypropylene), a composite film layer of PPA and PP and the like. The insulating surface pad can separate the two ends of the winding core 40 from the bottom wall of the shell 10 and the cover 20, thereby avoiding direct conduction and short circuit between the winding core 40 and the shell 10 or the cover 20.

The positive electrode tab 41 and the negative electrode tab 42 may be close to each other or far from each other, and are not limited herein. Illustratively, as shown in fig. 2, the positive tab 41 and the negative tab 42 are respectively located on opposite sides of the axial center of the winding core 40. In this manner, the spacing between positive tab 41 and negative tab 42 may be increased to further prevent the contact shorting of positive tab 41 and negative tab 42.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. The small-sized battery provided by the embodiment of the present application is described in detail above, and the principle and the implementation of the present application are explained herein by applying specific examples, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A miniature battery, comprising:

the winding core is arranged in the mounting cavity and comprises a positive plate, a diaphragm and a negative plate which are stacked and wound, the positive plate is connected with a positive tab, and the negative plate is connected with a negative tab; one of the positive electrode tab and the negative electrode tab is connected to the pole, and the other is connected to the connection portion.

2. A small-sized battery according to claim 1, wherein the mounting hole is formed at an axial center of the lid body, and the connecting portion is provided near an edge of the lid body.

3. A small-sized battery according to claim 2, wherein the connecting portion extends in a circumferential direction of the lid body.

4. A small-sized battery according to claim 2, wherein the connecting portion is welded and fixed to a peripheral wall of the case.

5. A small-sized battery according to any one of claims 1 to 4, wherein the connecting portion is formed by partially recessing the lid body, and a direction of the recess of the connecting portion is from outside the mounting cavity toward inside the mounting cavity.

6. A small-sized battery according to any one of claims 1 to 4, wherein the positive electrode tab or the negative electrode tab is connected to a surface of the connecting portion facing away from the peripheral wall of the case.

7. A small-sized battery according to any one of claims 1 to 4, wherein the positive electrode tab or the negative electrode tab is welded and fixed to the connection portion.

8. A small-sized battery according to any one of claims 1 to 4, wherein a liquid injection hole is further formed in the lid body, and the small-sized battery further comprises a sealing member for sealing the liquid injection hole.

9. A small-sized battery according to any one of claims 1 to 4, wherein insulating surface gaskets are provided at both ends in the axial direction of the winding core.

10. A small-sized battery according to any one of claims 1 to 4, wherein the positive electrode tab and the negative electrode tab are located on opposite sides of the axial center of the winding core.