CN113042874A

CN113042874A - Ultrasonic welding head

Info

Publication number: CN113042874A
Application number: CN202110262529.0A
Authority: CN
Inventors: 常柯; 张明杰; 黎帆; 刘冯新
Original assignee: Kunshan Ju Innovative Energy Technology Co Ltd
Current assignee: Kunshan Ju Innovative Energy Technology Co Ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-06-29

Abstract

The application relates to ultrasonic welding technical field particularly, relates to an ultrasonic bonding tool, and it includes: a base having a planar surface; the welding teeth are arranged on the plane at intervals, and the surface of each welding tooth is formed with an arc surface. The application provides an ultrasonic bonding head weld the surface of tooth and be formed with the cambered surface, cambered surface contact switching piece can not lead to the switching piece to be damaged by the cutting among the welding process, owing to weld the sharp edges and corners on the tooth surface and do not exist, is difficult to appear the edges and corners and is the cockscomb structure and lead to the problem that the tooth was welded in the switching piece adhesion to can effectively avoid the switching piece to be welded brokenly, improve the tensile strength of the welding part of switching piece and utmost point ear.

Description

Ultrasonic welding head

Technical Field

The application relates to the technical field of ultrasonic welding, in particular to an ultrasonic welding head.

Background

At present, an ultrasonic welding mode is basically adopted in a cell welding procedure in the production of the soft package lithium battery, the adapter sheet and a pole lug of the cell are connected together under the action of a welding head, sometimes, the adapter sheet is easy to weld during welding, the welding quality is reduced, and the tensile strength of a welding part is low.

Disclosure of Invention

The application aims at providing an ultrasonic welding head to solve the problem that the tensile strength of the welding part of an adapter plate and a tab in the prior art is low.

The embodiment of the application is realized as follows:

in a first aspect, embodiments of the present application provide an ultrasonic horn, comprising:

a base having a planar surface;

the welding teeth are arranged on the plane at intervals, and the surface of each welding tooth is formed with an arc surface.

The application provides an ultrasonic bonding head weld the surface of tooth and be formed with the cambered surface, cambered surface contact switching piece can not lead to the switching piece to be damaged by the cutting among the welding process, owing to weld the sharp edges and corners on the tooth surface and do not exist, is difficult to appear the edges and corners and is the cockscomb structure and lead to the problem that the tooth was welded in the switching piece adhesion to can effectively avoid the switching piece to be welded brokenly, improve the tensile strength of the welding part of switching piece and utmost point ear.

In an embodiment of this application, weld the tooth and be the bar, the bar weld the tooth by first surface, second surface, third surface, fourth surface, first terminal surface and second terminal surface and constitute, the first surface the second surface the third surface with the fourth surface is located first terminal surface with between the second terminal surface, the first surface the second surface the third surface with the fourth surface is end to end connection in proper order, the first surface laminate in the plane, the third surface is the cambered surface, the third surface respectively with the second surface the fourth surface smooth connection.

In above-mentioned technical scheme, the first surface of welding the tooth is used for connecting the base member, and the third surface is the cambered surface in order to be used for contacting the switching piece when the welding, and second surface, fourth surface are used for connecting first surface and third surface respectively, through setting up the third surface into with second surface, fourth surface smooth connection to the edge of third surface forms sharp edge, avoids welding broken switching piece, with the tensile strength who improves the welding position of switching piece and utmost point ear.

In one embodiment of the present application, the second surface and the fourth surface are curved surfaces.

In the technical scheme, the second surface and the fourth surface are also provided with the cambered surfaces, so that the smooth connection between the second surface and the first surface and the smooth connection between the second surface and the third surface are smoother, and the smooth connection between the fourth surface and the first surface and the smooth connection between the fourth surface and the third surface are smoother, so that the transition piece is further prevented from being welded, and the tensile strength of the welding part of the transition piece and the tab is improved.

In one embodiment of the present application, the welding teeth in strip form are cylindrical.

In an embodiment of the present application, a central angle corresponding to a cross section of a continuous arc surface formed by the second surface, the third surface, and the fourth surface is 100 ° to 200 °.

In the technical scheme, if the strip-shaped welding teeth are taken as cylinders, the central angle corresponding to the first surface is 160-260 degrees, the first surface is stably connected with the plane, and a continuous cambered surface can be stably supported to ensure the welding strength.

In one embodiment of the present application, the first end surface and the second end surface smoothly transition with the second surface, the third surface and the fourth surface, respectively.

In the technical scheme, the connecting parts of the first end face and the second surface, the third surface and the fourth surface are in smooth transition, and the connecting parts of the second end face and the second surface, the third surface and the fourth surface are in smooth transition, so that sharp edges are prevented from being formed at the edges of the two ends of the second surface, the third surface and the fourth surface, the transition piece is prevented from being welded and broken, and the tensile strength of the welding part of the transition piece and the pole lug is improved.

In one embodiment of the present application, the first end face and the second end face are both hemispherical.

In the technical scheme, the smooth transition of the connecting parts of the first end surface, the second surface, the third surface and the fourth surface is smoother, and the smooth transition of the connecting parts of the second end surface, the second surface, the third surface and the fourth surface is smoother, so that the transition piece is further prevented from being welded, and the tensile strength of the welding part of the transition piece and the tab is improved.

In an embodiment of the present application, the plane is a rectangle, the welding teeth are in the shape of a bar, and the welding teeth in the shape of a plurality of bars are arranged at intervals along the plane of the rectangle.

In one embodiment of the application, the direction of extension of the welding tooth is parallel to the long sides of the plane.

In one embodiment of the application, the direction of extension of the welding tooth is parallel to the short side of the plane.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a top view of a prior art ultrasonic horn;

FIG. 2 is a schematic top view of an ultrasonic horn provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic left side view of an ultrasonic horn provided in accordance with an embodiment of the present application;

FIG. 4 is a schematic front view of an ultrasonic horn provided in accordance with an embodiment of the present application;

FIG. 5 is a schematic front view of an ultrasonic horn provided in accordance with another embodiment of the present application;

FIG. 6 is a schematic view of a welded tooth according to another embodiment of the present application;

fig. 7 is a schematic front view of an ultrasonic horn according to yet another embodiment of the present application.

Icon: 100-a substrate; 110-plane; 200-welding teeth; 210-a first surface; 220-a second surface; 230-a third surface; 240-fourth surface; 250-a first end face; 260-a second end face; a-a welding head; b-welding teeth.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

The tabs of the cells of lithium batteries are typically connected to electrode terminals by tabs. In the production of the soft package lithium battery, the adapter sheet is generally connected with the pole lug in an ultrasonic welding mode.

The inventor finds that the tensile strength of the welding part of the adapter sheet and the pole lug is not high, and the reason that the tensile strength of the welding part is not high is mainly because the adapter sheet is damaged frequently, and the inventor further finds that the damage reason is that the adapter sheet is easy to weld and break in the welding process. Most of the switching piece is made of foil, an ultrasonic welding head is needed to be used during ultrasonic welding, the welding head is pressed on the surface of the switching piece in the welding process, the switching piece and a tab are hot-melted and pressed together by utilizing high temperature generated by ultrasonic high-frequency vibration and high-frequency vibration, the existing ultrasonic welding head is shown in figure 1, a plurality of pyramidal welding teeth B are arranged on a welding head A, the pyramidal welding teeth B have sharp edges and corners, and the switching piece is easily damaged during welding.

The application provides an ultrasonic welding head for solve the problem that the tensile strength is low at the welding part of switching piece and utmost point ear.

As shown in fig. 3, the ultrasonic horn includes a base 100 and a plurality of teeth 200.

The base body 100 is used for connecting a welding device, as shown in fig. 1 and 2, a plane 110 is formed on the base body 100, and a plurality of welding teeth 200 are arranged on the plane 110 at intervals.

As shown in fig. 3, the surfaces of the welding teeth 200 are each formed with a curved surface.

In the welding process, the cambered surface contact switching piece of bonding tool because the surface that welds tooth 200 and be used for contacting the switching piece does not have sharp edges and corners, can effectively avoid the switching piece to damage under high-frequency vibration and high temperature effect, solves the problem that the switching piece is welded brokenly among the prior art and leads to welding position tensile strength low.

In addition, when the surface of welding the tooth is not smooth, lead to the adaptor piece hot melt gomphosis on the surface of not smooth easily under high temperature high pressure, lead to adaptor piece and welding the tooth adhesion promptly, when the welding was accomplished, it will pull the adaptor piece to weld the tooth and leave the adaptor piece. The edges and corners of the welding teeth B of the existing welding head A are easily worn under high-frequency vibration, so that the edges and corners are not smooth and even worn to form saw-toothed shapes, the welding quality of the existing welding head A is unstable, and the replacement rate of the welding head A is high.

The application provides a bonding tool is the smooth cambered surface with the contact surface of switching piece, does not have sharp edges and corners, is difficult to appear the edges and corners and is the cockscomb structure and leads to the problem that the tooth 200 was welded in the switching piece adhesion by wearing and tearing to can effectively avoid the switching piece to be welded brokenly, improve the tensile strength of the welding part of switching piece and utmost point ear.

Referring again to fig. 3, the teeth 200 are bar-shaped, and a plurality of teeth 200 are axially parallel and spaced apart on the flat surface 110 of the horn.

As shown in fig. 4, the welding tooth 200 in a bar shape is composed of a first surface 210, a second surface 220, a third surface 230, a fourth surface 240, a first end surface 250, and a second end surface 260.

The first surface 210, the second surface 220, the third surface 230 and the fourth surface 240 are located between the first end surface 250 and the second end surface 260, and the first surface 210, the second surface 220, the third surface 230 and the fourth surface 240 are sequentially connected end to end.

The first surface 210 is adapted to be attached to the flat surface 110, the third surface 230 is an arc surface for contacting the interposer, and the second surface 220 and the fourth surface 240 are adapted to connect the first surface 210 and the third surface 230, respectively.

In some embodiments, the tooth 200 may also be integrally formed with the base 100 such that there is no interface between the flat surface 110 and the first surface 210.

Optionally, the third surface 230 is smoothly connected to the second surface 220 and the fourth surface 240, respectively, to prevent sharp edges from being formed on two long sides of the third surface 230, so as to further avoid welding the interposer, and improve the tensile strength of the welding portion of the interposer and the tab.

In another embodiment of the present application, as shown in fig. 5, the second surface 220 and the fourth surface 240 are configured as a curved surface to make the smooth connection of the second surface 220 with the first surface 210 and the third surface 230 smoother and the smooth connection of the fourth surface 240 with the first surface 210 and the third surface 230 smoother, so that the second surface 220, the third surface 230 and the fourth surface 240 form a continuous curved surface.

Optionally, the bar-shaped welding teeth 200 are configured as cylinders.

As shown in fig. 6, when a cross section is taken along an axial direction perpendicular to the tooth 200, a central angle α corresponding to a continuous arc surface formed by the second surface 220, the third surface 230, and the fourth surface 240 is set to 100 ° to 200 °. Therefore, the central angle corresponding to the first surface 210 is 160-260 degrees, so that the contact surface of the welding tooth 200 and the plane 110 is large enough, the first surface 210 is stably connected with the plane 110, and a continuous arc surface can be stably supported to ensure the welding strength.

In yet another embodiment, the tooth 200 is sectioned perpendicular to the axial direction, and the size of any section of the tooth 200 is different, so as to form a bar-shaped cylinder with a variable diameter along the axial direction, as shown in fig. 7. The tooth 200 of fig. 4 and 5 can form a bonding surface having a plurality of strip-shaped bonding sites, and the tooth 200 of fig. 7 can form a bonding surface having matrix points.

In the above embodiments, there may be provided: the connecting parts of the first end face 250 and the second surface 220, the third surface 230 and the fourth surface 240 are in smooth transition, and the connecting parts of the second end face 260 and the second surface 220, the third surface 230 and the fourth surface 240 are in smooth transition, so that sharp edges are prevented from being formed at the edges of the two ends of the second surface 220, the third surface 230 and the fourth surface 240, the transition piece is prevented from being welded and broken, and the tensile strength of the welding part of the transition piece and the pole lug is improved.

Optionally, the first end surface 250 and the second end surface 260 are configured as hemispherical surfaces, so that the connection portions of the first end surface 250 and the second surface 220, the third surface 230, and the fourth surface 240 are smoothly transited, and the connection portions of the second end surface 260 and the second surface 220, the third surface 230, and the fourth surface 240 are smoothly transited, so as to prevent the connection portions from being angular.

In the embodiment of the present application, the plane 110 of the base body 100 is configured as a rectangle, and the strip-shaped welding teeth 200 are arranged at intervals along the plane 110 of the rectangle.

Optionally, the extending direction of the welding tooth 200 is parallel to the long side of the plane 110.

Optionally, the extending direction of the welding tooth 200 is parallel to the short side of the plane 110.

Taking the welding head in fig. 5 as an example, a plurality of strip-shaped welding teeth 200 are arranged on the sticky rectangular plane 110 of the substrate 100, the plurality of welding teeth 200 are arranged at intervals along the short side direction of the plane 110, and the extending direction of each welding tooth 200 is parallel to the long side of the plane 110.

In order to ensure the welding strength, enough welding parts are arranged between the adapter plate and the pole lug, and the interval range of the welding teeth 200 is 0-5 mm.

The length of the welding tooth 200 is designed according to the length of the area to be welded, and the length range of the welding tooth 200 is 5 mm-100 mm.

The width of the welding tooth 200 is designed according to the width of the area to be welded, and the width of the welding tooth 200 is configured to be 0.5 mm-10 mm.

In order to prevent the flat surface 110 of the base 100 from directly contacting the interposer, the welding teeth 200 are arranged to have a height, and in order to prevent the welding teeth 200 from being deformed when pressing the interposer in consideration of the strength of the welding teeth 200, the height of the welding teeth 200 is arranged to be 0.5mm to 5mm on the basis of the length and width.

The inventors used the welding head of fig. 5 and the existing welding head a of fig. 1 to weld the tabs on the tabs of 32 cells in the same batch.

Welding area length 20mm, width 3mm, the adaptor piece is the copper foil of thickness 8um, and the welding number of piles is 25pcs, and utmost point ear is the copper nickel plating material of thickness 0.3 mm.

The bonding tool of the present embodiment was configured: the length of the welding tooth 200 is 20mm, the width of the welding tooth 200 is 1mm, the distance between the welding teeth 200 is 0mm, the height of the welding tooth 200 is 0.8mm, and the arc angle of the welding tooth 200 is 180 degrees.

And respectively measuring the tensile strength of the welding part and the welding breakage degree of the adapter plate after welding is finished, and obtaining the following table:

as can be seen from the above table, when the welding head of the present embodiment is used, the average tensile force at the welding position is about 19N higher than that of the existing welding head a, and the deviation of the tensile force value at the welding position of each electrical core is small, so that the product quality is more stable and the quality is better controlled. In addition, when the welding head of the embodiment is used for welding, the welding breakage ratio and the damage severity degree are obviously reduced, and the yield is greatly improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultrasonic horn, comprising:

a base having a planar surface;

2. The ultrasonic horn of claim 1, wherein the horn teeth are bar-shaped, the bar-shaped horn teeth are comprised of a first surface, a second surface, a third surface, a fourth surface, a first end surface and a second end surface, the first surface, the second surface, the third surface and the fourth surface are located between the first end surface and the second end surface, the first surface, the second surface, the third surface and the fourth surface are sequentially connected end to end, the first surface is attached to the plane, the third surface is an arc surface, and the third surface is respectively in smooth connection with the second surface and the fourth surface.

3. The ultrasonic horn of claim 2 wherein the second surface and the fourth surface are curved surfaces.

4. An ultrasonic horn according to claim 3 wherein the teeth in the form of bars are cylindrical.

5. The ultrasonic horn of claim 4 wherein the second, third and fourth surfaces form a continuous arcuate surface having a cross-section corresponding to a central angle of 100 ° to 200 °.

6. The ultrasonic horn of claim 4 wherein the first end face, the second end face, and the second surface smoothly transition with the second surface, the third surface, and the fourth surface, respectively.

7. The ultrasonic horn of any one of claims 2-6 wherein the first end face and the second end face are both hemispherical.

8. The ultrasonic horn of claim 1 wherein said plane is rectangular and said horn teeth are bar-shaped, a plurality of said bar-shaped horn teeth being spaced apart along said plane of the rectangle.

9. An ultrasonic horn according to claim 8 wherein the teeth extend parallel to the long sides of the plane.

10. An ultrasonic horn according to claim 8 wherein the teeth extend parallel to the short sides of the plane.