CN217776008U

CN217776008U - Welding head and welding device

Info

Publication number: CN217776008U
Application number: CN202221625062.8U
Authority: CN
Inventors: 刘彩胜; 邹晓曦; 宋书涛; 张小细
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-11-11
Anticipated expiration: 2032-06-27

Abstract

The application provides a welding head and a welding device, and relates to the technical field of welding. The welding head has a mounting end and includes a main weld portion and an auxiliary weld portion. Along first direction, the one end that main welding portion deviates from the installation end is provided with the main tooth that welds. The auxiliary welding part is located on the side of the main welding part, and one end, deviating from the mounting end, of the auxiliary welding part is provided with auxiliary welding teeth along the first direction. Wherein, along first direction, the auxiliary welding tooth is closer to the installation end than the main welding tooth. During welding, the main welding teeth on the main welding part are fully contacted with the workpiece to form a fully welded main welding area on the workpiece, and the auxiliary welding teeth on the auxiliary welding part are closer to the mounting end than the main welding teeth, so that the auxiliary welding teeth are not fully contacted with the workpiece, and a buffer area which is not fully welded is formed on the workpiece. Therefore, buffer area buffer transition is formed between the unwelded area and the main welding area on the workpiece, and abrupt shearing force can be avoided between the main welding area and the unwelded area when the workpiece is stressed, so that the workpiece is not easy to break between the main welding area and the unwelded area during assembly.

Description

Welding head and welding device

Technical Field

The application relates to the technical field of welding, in particular to a welding head and a welding device.

Background

Batteries are widely applied in the field of new energy resources, such as electric vehicles, new energy vehicles and the like, and the new energy vehicles and the electric vehicles become new development trends of the automobile industry. The battery includes an electrode assembly, which is a part in the battery where electrochemical reactions occur. The electrode assembly is mainly formed by winding or laminating a positive pole piece and a negative pole piece. After the winding or stacking of the positive pole piece and the negative pole piece is completed, the multilayer tabs on the positive pole piece and the negative pole piece need to be welded, so that the stacked multilayer tabs are welded into a whole.

However, conventionally, after welding the tab, the tab is easily broken when folding the tab (reducing the space occupied by the tab by bending the tab) or assembling the tab.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the present application is to provide a welding head and a welding device, which aim to solve the problem that after a tab is welded in the related art, the tab is easily broken when the tab is folded (the tab is folded to reduce the occupied space) or assembled.

In a first aspect, an embodiment of the present application provides a welding head, where the welding head has a mounting end, the welding head includes a main welding portion and an auxiliary welding portion, and a main welding tooth is disposed at an end of the main welding portion away from the mounting end along a first direction; the auxiliary welding part is positioned on the side part of the main welding part, and auxiliary welding teeth are arranged at one end, away from the mounting end, of the auxiliary welding part along the first direction; wherein, along the first direction, the auxiliary welding teeth are closer to the mounting end than the main welding teeth.

In the technical scheme, the welding head is provided with the main welding part and the auxiliary welding part, when in welding, the main welding teeth on the main welding part are fully contacted with the workpiece, a main welding area for full welding is formed on the workpiece, and the auxiliary welding teeth on the auxiliary welding part are closer to the mounting end than the main welding teeth, so that the auxiliary welding teeth are not fully contacted with the workpiece, and a buffer area for insufficient welding is formed on the workpiece. Therefore, buffer area buffer transition is formed between the unwelded area and the main welding area on the workpiece, and abrupt shearing force can be avoided between the main welding area and the unwelded area when the workpiece is stressed, so that the workpiece is not easy to break between the main welding area and the unwelded area during assembly.

As an optional technical solution of the embodiment of the present application, one end of the auxiliary welding portion, which is away from the mounting end, forms a first end surface, the auxiliary welding teeth are disposed on the first end surface, the auxiliary welding portion has a connecting end and an edge end which are oppositely arranged along a second direction, and the connecting end is connected to the main welding portion; the first end face is gradually reduced in distance from the mounting end in a first direction along a direction in which the connecting end points to the edge end, and the second direction is perpendicular to the first direction.

In the technical scheme, the main welding teeth and the auxiliary welding teeth are identical in size and structure. By making the first end face gradually decrease in distance from the mounting end in the first direction along the direction in which the connection end points to the edge end, the auxiliary welding teeth that are farther from the connection end are closer in distance from the mounting end in the first direction along the direction in which the connection end points to the edge end. Like this, the more is close to the position of main welding district on the buffer zone, the more abundant welding, the more is far away from the position of main welding district, and the welding is insufficient more, and the intensity of buffer zone weakens from being close to main welding district to keeping away from main welding district gradually, realizes better buffering effect.

As an optional technical solution of the embodiment of the present application, the first end surface is an inclined surface or an arc surface that is obliquely arranged.

In above-mentioned technical scheme, set up first terminal surface into inclined plane or cambered surface, be convenient for set up and assist and weld the tooth, and easily guarantee along the direction of the directional edge end of link, the auxiliary that keeps away from the link more welds the tooth and is closer to the distance of installation end on the first direction.

As an optional technical solution of the embodiment of the present application, along the first direction, the maximum distance between the main welding tooth and the auxiliary welding tooth is L, and satisfies: l is more than 0 and less than or equal to 3mm.

In above-mentioned technical scheme, through making main welding tooth and supplementary welding tooth along the maximum distance of first direction be greater than 0 to guarantee to weld the tooth along first direction and be closer to the installation end than main welding tooth. Make the owner weld the tooth and weld the tooth with the assistance and do not exceed 3mm along the maximum distance of first direction to make the assistance on the auxiliary welding portion weld the tooth homoenergetic and contact with the work piece, can not make partial auxiliary welding portion unable and the work piece contact and cause the waste.

As an optional technical solution of the embodiment of the present application, along the second direction, the auxiliary welding portion is located on one side of the main welding portion, the length of the auxiliary welding portion in the second direction is smaller than the length of the main welding portion in the second direction, and the second direction is perpendicular to the first direction.

In the technical scheme, the length of the auxiliary welding part in the second direction is smaller than that of the main welding part in the second direction, so that the size of the auxiliary welding part is limited, and the phenomenon that the size of the welding head is increased due to the fact that the auxiliary welding part is too large is avoided. In addition, the buffer zone can have a good buffer effect only by being formed, so that a sharp shearing force can be avoided between the main welding zone and the non-welding zone when a workpiece is stressed, and the effect is not obviously improved by the overlarge buffer zone.

As an optional technical solution of the embodiment of the present application, the welding head includes two auxiliary welding portions, two auxiliary welding portions are disposed on two sides of the main welding portion along a second direction, and the second direction is perpendicular to the first direction.

In the technical scheme, the auxiliary welding parts are formed on the two sides of the main welding part along the second direction, so that the buffer areas are formed on the two sides of the main welding area on the workpiece respectively after welding, the buffering effect is improved, and the workpiece is not easy to break between the main welding area and the unwelded area during assembly.

As an optional technical scheme of this application embodiment, follow first direction, one assist in the welding portion weld the tooth with main maximum distance that welds between the tooth is L1, another assist in the welding portion weld the tooth with main maximum distance that welds between the tooth is L2, satisfies, and L1 ≠ L2.

In the above technical scheme, as required, the maximum distance between the auxiliary welding tooth and the main welding tooth on one auxiliary welding part can be different from the maximum distance between the auxiliary welding tooth and the main welding tooth on the other auxiliary welding part, so as to improve the adaptability of the welding head to different working conditions.

As an optional technical solution of the embodiment of the present application, one end of the auxiliary welding portion, which deviates from the mounting end, forms a first end surface, the auxiliary welding teeth are arranged on the first end surface, and the first end surface is an arc surface; the curvature of the first end surface of one of the auxiliary welding parts is not equal to the curvature of the first end surface of the other auxiliary welding part.

In the technical scheme, the auxiliary welding teeth on the two auxiliary welding parts have the same size and structure. The curvatures of the first end surface of one auxiliary welding part and the first end surface of the other auxiliary welding part are different, so that the maximum distance between the auxiliary welding tooth and the main welding tooth on the one auxiliary welding part can be different from the maximum distance between the auxiliary welding tooth and the main welding tooth on the other auxiliary welding part.

As an optional technical solution of the embodiment of the present application, one end of the auxiliary welding portion, which deviates from the mounting end, forms a first end surface, and the auxiliary welding teeth are arranged on the first end surface; the first end face of one auxiliary welding part is an inclined face, and the first end face of the other auxiliary welding part is an arc face.

In the technical scheme, the auxiliary welding teeth on the two auxiliary welding parts have the same size and structure. Set up to the inclined plane through the first terminal surface with an assistance welding portion, the first terminal surface of another assistance welding portion sets up to the cambered surface to realize that the maximum distance that the assistance in an assistance welding portion welded tooth and owner and welded between the tooth can be inequality with the maximum distance that the assistance in another assistance welding portion welded tooth and owner and welded between the tooth, in order to promote the adaptability of welding head to different operating modes.

As an optional technical solution of the embodiment of the present application, the auxiliary welding portion is disposed around the main welding portion.

In the technical scheme, the auxiliary welding part is arranged around the main welding part, so that after welding, the buffer area is arranged around the main welding area, the buffer area is formed around the main welding area, and a better buffering effect is achieved.

As an optional technical scheme of this application embodiment, assist the soldering portion including center on a plurality of linkage segments and a plurality of auxiliary welding section that main soldering portion set up follow the circumference of main soldering portion, adjacent two the auxiliary welding section is through one the linkage segment is connected, adjacent two in the auxiliary welding section, one the auxiliary welding section is through one the linkage segment circular arc transitions to another the auxiliary welding section.

In the technical scheme, the two adjacent auxiliary welding sections are in arc transition through the connecting section, so that after welding, the areas welded by the two auxiliary welding sections and the area welded by the connecting section on the workpiece can also be in arc transition, and the stress concentration of the buffer area is reduced.

As an optional technical scheme of the embodiment of the application, the outer side surface of the auxiliary welding section is a plane.

In the technical scheme, the outer side surface of the auxiliary welding section is set to be a plane, so that the manufacturing of the welding head can be simplified.

As an optional technical solution of the embodiment of the present application, a projection of the auxiliary welding portion along the first direction is track-shaped.

In above-mentioned technical scheme, the auxiliary welding portion encircles main welding portion and sets up, and the welding back, the buffer surrounds main welding area and sets up to all form the buffer around main welding area, the buffer is the runway form, can reduce the stress concentration of buffer.

As an optional technical solution of the embodiment of the present application, the welding head includes a plurality of the auxiliary welding portions, and the plurality of auxiliary welding portions are arranged along a circumferential direction of the main welding portion.

In the technical scheme, the auxiliary welding parts are arranged along the circumferential direction of the main welding part by arranging the auxiliary welding parts, so that a plurality of buffer areas surrounding the main welding area are formed after welding, and a better buffering effect is achieved.

In a second aspect, an embodiment of the present application further provides a welding device, where the welding device includes a welder body and the above-mentioned welding head, and the mounting end is installed in the welder body.

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 schematic block diagram of a welding apparatus provided in some embodiments of the present application;

fig. 2 is a schematic illustration of a bonding tool according to some embodiments of the present application;

fig. 3 is a schematic elevational view of a bonding tool according to some embodiments of the present application;

FIG. 4 is a schematic illustration of a weld impression formed on a workpiece after welding using the weld head shown in FIGS. 2 and 3;

fig. 5 is a schematic structural view of a bonding tool (first end face is a curved surface) according to some embodiments of the present application;

fig. 6 is a schematic front view of a bonding tool (first end face is a curved surface) according to some embodiments of the present application;

fig. 7 is a schematic view of a bonding tool (with a primary weld on both sides in a second direction) according to some embodiments of the present application;

fig. 8 is a schematic front view of a weld head (with a main weld portion having auxiliary weld portions on either side in a second direction) provided in accordance with some embodiments of the present application;

FIG. 9 is a schematic view of a weld head (with rows of secondary weld teeth on the secondary weld portion) provided in accordance with certain embodiments of the present application;

FIG. 10 is a schematic front view of a weld head (with rows of secondary weld teeth on the secondary weld portion) provided in accordance with certain embodiments of the present application;

FIG. 11 is a schematic view of a weld head (with rows of secondary weld teeth on the secondary weld portion and a first end surface that is a curved surface) provided in accordance with certain embodiments of the present application;

fig. 12 is a schematic front view of a weld head (having rows of secondary weld teeth on a secondary weld portion and a first end surface that is an arc) provided in accordance with certain example embodiments of the present application;

fig. 13 is a schematic view of a bonding tool (with different curvatures of the first end surfaces of the two sub-bonds) according to some embodiments of the present application;

fig. 14 is a schematic front view of a bonding tool (with different curvatures of the first end surfaces of the two sub-bonds) provided in accordance with some embodiments of the present application;

fig. 15 is a schematic structural view of a bonding tool (the first end surfaces of two auxiliary bonding portions are a bevel and a cambered surface, respectively) according to some embodiments of the present application;

fig. 16 is a schematic front view of a weld head (the first end surfaces of two secondary weld portions being a bevel and an arc, respectively) provided in accordance with some embodiments of the present application;

FIG. 17 is a schematic view of a weld head (sub-weld surrounding main weld) provided in accordance with certain embodiments of the present application;

FIG. 18 is a schematic illustration of a weld formed on a workpiece after welding using the weld head shown in FIG. 17;

fig. 19 is a schematic view of a bonding tool (with multiple sub-bonds arranged circumferentially along a main bond) according to some embodiments of the present application.

Icon: 10-a welding head; 11-a mounting end; 110-main weld; 111-main welding teeth; 120-auxiliary welding part; 121-auxiliary welding teeth; 122 — a first end face; 123-connecting end; 124-edge terminal; 125-auxiliary welding section; 126-connecting segment; 20-a welding device; 21-a welder body; 310-main welding area; 320-a buffer area; 321-straight line segment; 322-arc segment.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of the battery is more and more extensive from the development of market situation. The battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. As the field of application of batteries is continuously expanded, the market demand thereof is also continuously expanded.

The battery includes an electrode assembly, which is a part in the battery where electrochemical reactions occur. The electrode assembly is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate. After the winding or stacking of the positive pole piece and the negative pole piece is completed, the multilayer tabs on the positive pole piece and the negative pole piece need to be welded, so that the stacked multilayer tabs are welded into a whole. However, conventionally, after welding the tab, the tab is easily broken when folding the tab (reducing the space occupied by the tab by bending the tab) or assembling the tab.

The inventor further studies and finds that the welding of the electrode lugs in the prior art forms a welding area and an unwelded area on the electrode lug, wherein the multi-layer electrode lug in the welding area is heated and melted into a whole and is hard, and the unwelded area is still the multi-layer electrode lug and is soft. When the tab is folded (the space occupied by the tab is reduced by bending the tab) or assembled, abrupt shearing force is easily formed between a welding area and an unwelded area, so that the tab is broken.

In view of this, embodiments of the present application provide a bonding tool having a mounting end, the bonding tool including a primary bond and a secondary bond. Along first direction, the one end that main welding portion deviates from the installation end is provided with the main tooth that welds. The auxiliary welding part is located on the side of the main welding part, and one end, deviating from the mounting end, of the auxiliary welding part is provided with auxiliary welding teeth along the first direction. Wherein, along first direction, the auxiliary welding tooth is closer to the installation end than the main welding tooth.

The welding head is provided with a main welding part and an auxiliary welding part, during welding, a main welding tooth on the main welding part is fully contacted with a workpiece, a fully welded main welding area is formed on the workpiece, and an auxiliary welding tooth on the auxiliary welding part is closer to an installation end than the main welding tooth, so that the auxiliary welding tooth is not fully contacted with the workpiece, and an insufficiently welded buffer area is formed on the workpiece. Therefore, buffer area buffer transition is formed between the unwelded area and the main welding area on the workpiece, and abrupt shearing force can be avoided between the main welding area and the unwelded area when the workpiece is stressed, so that the workpiece is not easy to break between the main welding area and the unwelded area during assembly.

The technical scheme described in the embodiment of the application is suitable for welding workpieces, such as tabs.

Referring to fig. 1, fig. 1 is a schematic block diagram of a welding apparatus 20 according to some embodiments of the present disclosure. The embodiment of the application provides a welding device 20, and the welding device 20 comprises a welder body 21 and a welding head 10, wherein the welding head 10 is mounted on the welder body 21.

The welder body 21 is capable of providing energy to the weld head 10 to energize the weld head 10 such that the weld head 10 emits heat to effect a weld.

The welding head 10 is adapted to contact a workpiece to effect welding of the workpiece.

Referring to fig. 2, and to fig. 3 and 4 in combination, fig. 2 is a schematic diagram of a bonding tool 10 according to some embodiments of the present application. Fig. 3 is a schematic front view of a weld head 10 according to some embodiments of the present application. Fig. 4 is a schematic illustration of a weld impression formed on a workpiece after welding using the weld head 10 shown in fig. 2 and 3. The present embodiment provides a welding head 10, the welding head 10 having a mounting end 11, the welding head 10 including a main weldment 110 and a supplementary weldment 120. In the first direction, an end of the main soldering part 110 facing away from the mounting end 11 is provided with a main soldering tooth 111. The auxiliary welding part 120 is located at a side portion of the main welding part 110, and an end of the auxiliary welding part 120 away from the mounting end 11 is provided with an auxiliary welding tooth 121 along the first direction. Wherein the auxiliary welding teeth 121 are closer to the mounting end 11 than the main welding teeth 111 in the first direction.

The mounting end 11 is the end of the weld head 10 that is intended to be connected to the welder body 21. The weld head 10 also includes a weld end for contacting a workpiece to effect welding of the workpiece. The mounting end 11 is disposed opposite the welding end.

The first direction is a direction in which the mounting end 11 faces the soldering end or a direction in which the soldering end faces the mounting end 11. Referring to fig. 2 or fig. 3, the first direction is a direction a shown in fig. 2 or fig. 3.

The main welding part 110 is a part of the welding head 10, which mainly welds the workpiece, and one end of the main welding part 110, which is far away from the mounting end 11, is provided with a main welding tooth 111, and the main welding tooth 111 protrudes from an end surface of one end of the main welding part 110, which is far away from the mounting end 11. The main welding teeth 111 on the main welding portion 110 can be brought into sufficient contact with the workpiece to complete the welding of the workpiece. For example, when the workpiece is a multi-layer tab, the main welding tooth 111 contacts the tab, so that the multi-layer tab is melted to weld the multi-layer tab as a whole.

In some embodiments, the primary welding tooth 111 has a second end face facing away from the primary weld 110, and the second end faces of the plurality of primary welding teeth 111 lie in the same plane. Optionally, the plane of the second end surface of the main welding teeth 111 is parallel to the end surface of the mounting end 11, so as to improve the welding effect.

The auxiliary welding part 120 is a part of the welding head 10 for performing auxiliary welding on a workpiece, an auxiliary welding tooth 121 is arranged at one end of the auxiliary welding part 120, which is far away from the mounting end 11, and the auxiliary welding tooth 121 protrudes out of an end face of the auxiliary welding part 120, which is far away from the mounting end 11. The auxiliary welding teeth 121 on the auxiliary welding part 120 can contact with the workpiece, but the contact is not sufficient to complete auxiliary welding of the workpiece. For example, when the workpiece is a multi-layer tab, the auxiliary welding teeth 121 partially contact the tab, so that the tabs in the multi-layer tab are subjected to different degrees of hot melting, and partial tabs in the multi-layer tab are connected together or the multi-layer tabs are all connected together but have weaker connection strength than the tab welded by the main welding part 110.

The sub-pad 120 is located on one side of the main pad 110, and for convenience of illustration, the boundary between the main pad 110 and the sub-pad 120 is indicated by a dotted line in fig. 2 and 3. The dashed lines are merely to facilitate schematic distinguishing the locations of the main solder 110 and the sub solder 120, and do not represent structures that exist on the entity.

"along the first direction, the auxiliary welding tooth 121 is closer to the mounting end 11 than the main welding tooth 111" means that along the first direction, the distance between the main welding tooth 111 and the mounting end 11 is a first distance, and the distance between the auxiliary welding tooth 121 and the mounting end 11 is a second distance, wherein the first distance is greater than the second distance. Thus, the main welding tooth 111 can be brought into sufficient contact with the workpiece during welding, and a sufficiently welded main weld zone 310 can be formed in the workpiece. The auxiliary welding teeth 121 do not make sufficient contact with the workpiece and can form an insufficiently welded buffer zone 320 on the workpiece.

The welding head 10 has a main welding part 110 and a sub welding part 120, and during welding, the main welding tooth 111 of the main welding part 110 is in sufficient contact with the workpiece to form a main welding area 310 for sufficient welding on the workpiece, and the sub welding tooth 121 of the sub welding part 120 is closer to the mounting end 11 than the main welding tooth 111, so that contact with the workpiece is insufficient, and a buffer area 320 for insufficient welding is formed on the workpiece. Therefore, the buffer area 320 is arranged between the unwelded area and the main welding area 310 on the workpiece for buffer transition, so that abrupt shearing force between the main welding area 310 and the unwelded area can be avoided when the workpiece is stressed, and the workpiece is not easy to break between the main welding area 310 and the unwelded area during assembly.

Referring to fig. 2 and 3, in some embodiments, an end of the auxiliary welding portion 120 facing away from the mounting end 11 forms a first end surface 122, and the auxiliary welding teeth 121 are disposed on the first end surface 122. The auxiliary soldering part 120 has a connection end 123 and an edge end 124 oppositely arranged in the second direction, the connection end 123 being connected to the main soldering part 110. The first end surface 122 is gradually decreased in distance from the mounting end 11 in the first direction along a direction in which the connection end 123 is directed toward the edge end 124. The second direction is perpendicular to the first direction.

The first end surface 122 is a surface on which the auxiliary welding teeth 121 are provided. In other words, the auxiliary welding teeth 121 protrude from the first end surface 122. In addition, the first end face 122 is also a surface of the sub-solder portion 120 away from the mounting end 11.

The second direction is a direction perpendicular to the first direction. In the second direction, the supplementary welding portion 120 is located at one side of the main welding portion 110. Referring to fig. 2 and 3, the second direction is a direction B shown in fig. 2 or 3.

In the second direction, the connection end 123 is an end of the supplementary welding portion 120 facing the main welding portion 110, and the connection end 123 is used for connection with the main welding portion 110. The edge end 124 is the end of the minor weld 120 that faces away from the major weld 110.

"the distance from the first end surface 122 to the mounting end 11 in the first direction gradually decreases along the direction from the connecting end 123 to the edge end 124" is that in the second direction, the distance from the first end surface 122 to the mounting end 11 in the first direction gradually decreases from the position where the first end surface 122 is close to the connecting end 123 to the position where the first end surface 122 is far from the connecting end 123.

The main welding tooth 111 and the auxiliary welding tooth 121 are identical in size and structure. By gradually decreasing the distance from the first end face 122 to the mounting end 11 in the first direction along the direction in which the connecting end 123 points to the edge end 124, the auxiliary welding teeth 121 farther from the connecting end 123 are closer to the mounting end 11 in the first direction along the direction in which the connecting end 123 points to the edge end 124. Thus, the closer the buffer zone 320 is to the main welding zone 310, the more sufficient the welding is, and the farther the buffer zone 320 is from the main welding zone 310, the less sufficient the welding is, and the strength of the buffer zone 320 gradually decreases from the position near the main welding zone 310 to the position far from the main welding zone 310, so as to achieve a better buffer effect.

In some embodiments, the first end surface 122 is a sloped surface or a curved surface.

Referring to fig. 2 and 3, in the embodiment shown in fig. 2 and 3, the first end surface 122 is a slope.

Referring to fig. 5 and 6, fig. 5 is a schematic structural view of a bonding tool 10 (the first end surface 122 is an arc surface) according to some embodiments of the present disclosure. Fig. 6 is a schematic front view of a bonding tool 10 (first end surface 122 is a curved surface) according to some embodiments of the present application. In the embodiment shown in fig. 5 and 6, the first end surface 122 is a curved surface. The cambered surface is different according to the extending track and can be various. For example, the arc surface may be a circular arc surface extending along a circular arc locus. As another example, the curved surface may be a paraboloid extending along a parabolic trajectory.

The first end surface 122 is set to be an inclined surface or an arc surface, so that the auxiliary welding teeth 121 can be conveniently arranged, and it is easy to ensure that the auxiliary welding teeth 121 which are farther away from the connecting end 123 are closer to the mounting end 11 in the first direction along the direction in which the connecting end 123 points to the edge end 124.

In some embodiments, the maximum distance between the main welding tooth 111 and the auxiliary welding tooth 121 along the first direction is L, which satisfies: l is more than 0 and less than or equal to 3mm.

"the maximum distance L between the main welding tooth 111 and the auxiliary welding tooth 121 in the first direction" means the distance between the side of the main welding tooth 111 facing away from the mounting end 11 and the side of the auxiliary welding tooth 121 closest to the mounting end 11 facing away from the mounting end 11 in the first direction, i.e. the distance L shown in fig. 3 and 6.

By making the maximum distance between the main welding tooth 111 and the auxiliary welding tooth 121 in the first direction larger than 0, it is ensured that the auxiliary welding tooth 121 is closer to the mounting end 11 than the main welding tooth 111 in the first direction. The maximum distance between the main welding tooth 111 and the auxiliary welding tooth 121 along the first direction is not more than 3mm, so that the auxiliary welding teeth 121 on the auxiliary welding part 120 can be in contact with the workpiece, and waste caused by the fact that part of the auxiliary welding part 120 cannot be in contact with the workpiece is avoided.

In some embodiments, the minor weld 120 is located to one side of the major weld 110 in the second direction. The length of the sub-pad 120 in the second direction is smaller than the length of the main pad 110 in the second direction. The second direction is perpendicular to the first direction.

Referring to fig. 3 and 6, the length of the main soldering portion 110 in the second direction is denoted by D1, the length of the auxiliary soldering portion 120 in the second direction is denoted by D2, and the length of the auxiliary soldering portion 120 in the second direction is smaller than the length of the main soldering portion 110 in the second direction, that is, D2 < D1.

By making the length of the sub-fillet portion 120 in the second direction smaller than the length of the main-fillet portion 110 in the second direction, the size of the sub-fillet portion 120 is limited, and the size of the bonding tool 10 is prevented from being increased by making the sub-fillet portion 120 excessively large. In addition, the buffer area 320 can have a good buffer effect, so that when a workpiece is stressed, abrupt shearing force between the main welding area 310 and an unwelded area can be avoided, and the effect is not obviously improved by the overlarge buffer area 320.

Referring to fig. 7 and 8, fig. 7 is a schematic structural view of a welding head 10 (the main welding portion 110 has auxiliary welding portions 120 on both sides in the second direction) according to some embodiments of the present application. Fig. 8 is a front view of a bonding tool 10 (with a primary weld 110 having secondary welds 120 on both sides in a second direction) according to some embodiments of the present application. In some embodiments, the bonding tool 10 includes two sub-welds 120, and the two sub-welds 120 are disposed on both sides of the main weld 110 in the second direction. The second direction is perpendicular to the first direction.

"two auxiliary welding parts 120 are disposed on both sides of the main welding part 110 in the second direction", that is, one auxiliary welding part 120 is disposed on both sides of the main welding part 110 in the second direction.

The auxiliary welding parts 120 are formed on the two sides of the main welding part 110 along the second direction, so that the buffer areas 320 are formed on the two sides of the main welding area 310 on the workpiece respectively after welding, the buffer effect is improved, and the workpiece is not prone to being broken between the main welding area 310 and an unwelded area during assembly.

It should be noted that the number of the auxiliary welding teeth 121 on the auxiliary welding part 120 is not limited, and the auxiliary welding teeth 121 may be in one row or in multiple rows. For example, referring to fig. 7 and 8, in some embodiments, the auxiliary welding portion 120 is provided with a row of auxiliary welding teeth 121. Referring to fig. 9 and 10, fig. 9 is a schematic structural diagram of a welding head 10 (with a plurality of rows of auxiliary welding teeth 121 on the auxiliary welding portion 120) according to some embodiments of the present disclosure. Fig. 10 is a front view of a weld head 10 having rows of secondary teeth 121 on a secondary weld portion 120 according to some embodiments of the present application. In some embodiments, two rows of auxiliary welding teeth 121 are disposed on auxiliary welding portion 120. Of course, more than two rows of auxiliary welding teeth 121 may be disposed on the auxiliary welding part 120 as needed.

Referring to fig. 9 and 10, in some embodiments, the first end surfaces 122 of the two auxiliary welding parts 120 are inclined surfaces, and the inclination degrees of the first end surfaces 122 of the two auxiliary welding parts 120 are the same. Thus, in the first direction, the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on one auxiliary welding part 120 is equal to the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on the other auxiliary welding part 120. The two auxiliary welding parts 120 are identical in shape and structure, so that the positions of the two auxiliary welding parts 120 do not need to be distinguished during welding, and the welding is convenient.

Referring to fig. 11 and 12, fig. 11 is a schematic structural view of a welding head 10 (a secondary welding portion 120 has multiple rows of secondary welding teeth 121, and a first end surface 122 is an arc surface) according to some embodiments of the present application. Fig. 12 is a front view of a bonding tool 10 (with rows of secondary teeth 121 on the secondary backing portion 120 and arcuate first end surfaces 122) according to some embodiments of the present disclosure. In some embodiments, the first end surfaces 122 of the two auxiliary welding parts 120 are both arc surfaces, and the curvatures of the first end surfaces 122 of the two auxiliary welding parts 120 are the same. Thus, in the first direction, the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on one auxiliary welding part 120 is equal to the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on the other auxiliary welding part 120. The two auxiliary welding parts 120 are identical in shape and structure, so that the positions of the two auxiliary welding parts 120 do not need to be distinguished during welding, and the welding is convenient.

Referring to fig. 13 in conjunction with fig. 14, fig. 13 is a schematic structural view of a bonding tool 10 (with two sub-bonds 120 having different curvatures of their first end surfaces 122) according to some embodiments of the present disclosure. Fig. 14 is a front view of a bonding tool 10 (with the first end surfaces 122 of the two sub-bonds 120 having different curvatures) according to some embodiments of the present application. In some embodiments, in the first direction, a maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on one auxiliary welding portion 120 is L1, and a maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on the other auxiliary welding portion 120 is L2, where L1 ≠ L2.

"the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 of one auxiliary welding part 120 is L1" in the first direction means that the distance between the side of the main welding tooth 111 facing away from the mounting end 11 and the side of the auxiliary welding tooth 121 of one auxiliary welding part 120 closest to the mounting end 11 facing away from the mounting end 11 is L1 in the first direction, that is, the distance is L1 in fig. 14.

"the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on the other auxiliary welding part 120 in the first direction is L2" means that the distance between the side of the main welding tooth 111 facing away from the mounting end 11 and the side of the auxiliary welding tooth 121 on the other auxiliary welding part 120 closest to the mounting end 11 facing away from the mounting end 11 in the first direction is L2, that is, the distance is L2 in fig. 14.

According to the requirement, the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on one auxiliary welding part 120 may be different from the maximum distance between the auxiliary welding tooth 121 and the main welding tooth 111 on the other auxiliary welding part 120, so as to improve the adaptability of the welding head 10 to different working conditions.

Referring to fig. 13 and 14, fig. 13 is a schematic view of a bonding tool 10 (with the first end surfaces 122 of the two sub-bonds 120 having different curvatures) according to some embodiments of the present disclosure. Fig. 14 is a front view of a bonding tool 10 (with the first end surfaces 122 of the two sub-bonds 120 having different curvatures) according to some embodiments of the present application. In some embodiments, an end of the auxiliary welding portion 120 away from the mounting end 11 forms a first end surface 122, the auxiliary welding tooth 121 is disposed on the first end surface 122, and the first end surface 122 is a circular arc surface. The curvature of the first end surface 122 of one of the sub-solder portions 120 is not equal to the curvature of the first end surface 122 of the other sub-solder portion 120.

The curvature of the curve is the rotation rate of the tangential direction angle to the arc length of a certain point on the curve, and is defined by differentiation, and shows the degree of deviation of the curve from a straight line. The larger the curvature, the more curved the curve is. The curvatures of the points on the circular arc surface are the same.

The phrase "the curvature of the first end surface 122 of one of the sub-solder portions 120 is not equal to the curvature of the first end surface 122 of the other sub-solder portion 120" means that the first end surface 122 of one of the sub-solder portions 120 is bent to a different degree than the first end surface 122 of the other sub-solder portion 120.

Referring to fig. 14, the first end surface 122 of the auxiliary welding part 120 at the left end is bent to a lesser extent than the first end surface 122 of the auxiliary welding part 120 at the right end. As shown in fig. 14, the maximum distance between the auxiliary welding tooth 121 on the auxiliary welding part 120 at the right end and the main welding tooth 111 is L1, and the maximum distance between the auxiliary welding tooth 121 on the auxiliary welding part 120 at the left end and the main welding tooth 111 is L2, where L2 > L1.

The auxiliary welding teeth 121 on the two auxiliary welding parts 120 are identical in size and structure. By making the curvatures of the first end surface 122 of one auxiliary soldering part 120 and the first end surface 122 of the other auxiliary soldering part 120 different, it is achieved that the maximum distance between the auxiliary soldering tooth 121 and the main soldering tooth 111 on one auxiliary soldering part 120 can be different from the maximum distance between the auxiliary soldering tooth 121 and the main soldering tooth 111 on the other auxiliary soldering part 120.

Referring to fig. 15 and 16, fig. 15 is a schematic structural view of a bonding tool 10 (the first end surfaces 122 of the two auxiliary bonding portions 120 are respectively a bevel and an arc) according to some embodiments of the present application. Fig. 16 is a front view of a bonding tool 10 (the first end surfaces 122 of the two sub-bonds 120 are beveled and curved, respectively) according to some embodiments of the present disclosure. In some embodiments, an end of the auxiliary solder 120 facing away from the mounting end 11 forms a first end face 122, and the auxiliary solder tooth 121 is disposed on the first end face 122. The first end surface 122 of one auxiliary welding part 120 is an inclined surface, and the first end surface 122 of the other auxiliary welding part 120 is an arc surface.

Referring to fig. 15 and 16, the first end surface 122 of the auxiliary welding portion 120 at the left end is an inclined surface. The first end surface 122 of the auxiliary welding part 120 at the right end is an arc surface. As shown in fig. 16, the maximum distance between the auxiliary welding tooth 121 on the auxiliary welding part 120 at the right end and the main welding tooth 111 is L1, and the maximum distance between the auxiliary welding tooth 121 on the auxiliary welding part 120 at the left end and the main welding tooth 111 is L2, where L2 > L1.

The auxiliary welding teeth 121 on the two auxiliary welding parts 120 are identical in size and structure. The first end face 122 of one auxiliary welding part 120 is set to be an inclined face, and the first end face 122 of the other auxiliary welding part 120 is set to be an arc face, so that the maximum distance between the auxiliary welding teeth 121 and the main welding teeth 111 on the one auxiliary welding part 120 can be different from the maximum distance between the auxiliary welding teeth 121 and the main welding teeth 111 on the other auxiliary welding part 120, and the adaptability of the welding head 10 to different working conditions is improved.

Referring to fig. 17 and 18, fig. 17 is a schematic structural view of a welding head 10 (with the auxiliary weldment 120 surrounding the main weldment 110) according to some embodiments of the present application. Fig. 18 is a schematic illustration of a weld impression formed on a workpiece after welding with the weld head 10 shown in fig. 16. In some embodiments, the minor weld 120 is disposed around the major weld 110.

The sub-pad 120 has a ring structure, and the main pad 110 is connected to the inner circumference of the sub-pad 120. Thus, the auxiliary solder portion 120 can surround the main solder portion 110.

By arranging the auxiliary welding part 120 around the main welding part 110, the buffer area 320 is arranged around the main welding area 310 after welding, so that the buffer area 320 is formed around the main welding area 310, and a better buffering effect is achieved.

In some embodiments, the minor weld 120 includes a plurality of connection segments 126 and a plurality of minor weld segments 125 disposed about the major weld 110. In the circumferential direction of the main welding portion 110, two adjacent auxiliary welding sections 125 are connected by one connecting section 126. In the adjacent two brazing sections 125, one brazing section 125 is arc-transitioned to the other brazing section 125 by one connecting section 126.

The filler neck section 125 is a portion of the filler neck 120 that mainly functions as a filler neck. The connecting section 126 is a portion of the sub-weldment 120 that connects two adjacent sub-weldments 125 to realize an arc transition between the two adjacent sub-weldments 125. The auxiliary welding segments 125 and the connection segments 126 are alternately arranged along the circumferential direction of the main welding portion 110.

Two adjacent auxiliary welding sections 125 are in arc transition through the connecting section 126, so that after welding, the areas welded by the two auxiliary welding sections 125 and the area welded by the connecting section 126 on the workpiece can also be in arc transition, and the stress concentration of the buffer area 320 is reduced.

In some embodiments, the outer side of the minor weld segment 125 is planar.

The outer side of the minor weld segment 125 is the surface of the minor weld segment 125 facing away from the major weld 110. Along the first direction, the projection of the outer side surface of the auxiliary welding part 120 on the mounting end 11 is a straight line segment.

Providing the outer side of the minor weld segment 125 as a flat surface can simplify manufacturing of the weld head 10.

In some embodiments, the projection of the minor weld 120 in the first direction is racetrack shaped.

The projection of the auxiliary welding part 120 along the first direction is track-shaped, and the buffer area 320 formed after the auxiliary welding part is welded on the workpiece is also track-shaped. The track-shaped buffer area 320 comprises two straight line segments 321 and two opposite circular arc segments 322, the two straight line segments 321 are arranged in parallel, one straight line segment 321 is connected with one end of one circular arc segment 322 and one end of the other circular arc segment 322, and the other straight line segment 321 is connected with the other end of the other circular arc segment 322 and the other end of the other circular arc segment 322. In short, the projection of the auxiliary welding part 120 along the first direction is the same as the shape of the runway on the playground, and thus it is called as a runway shape.

The auxiliary welding part 120 is arranged around the main welding part 110, and after welding, the buffer area 320 is arranged around the main welding area 310 so as to form the buffer area 320 around the main welding area 310, wherein the buffer area 320 is in a runway shape, and stress concentration of the buffer area 320 can be reduced.

Referring to fig. 19, fig. 19 is a schematic structural view of a welding head 10 (a plurality of auxiliary weldments 120 are circumferentially arranged along a main weldment 110) according to some embodiments of the present application. In some embodiments, the weld head 10 includes a plurality of secondary welds 120, the plurality of secondary welds 120 being arranged along the circumference of the main weld 110.

The plurality of sub-pads 120 may be arranged at intervals along the circumferential direction of the main pad 110, that is, adjacent two sub-pads 120 may have a space therebetween. Of course, two adjacent sub-welds 120 may also be joined together.

Through setting up a plurality of soldering parts 120 of assisting, a plurality of soldering parts 120 of assisting are arranged along the circumference of main welding part 110 for form a plurality of buffers 320 that encircle main welding zone 310 after the welding, thereby have better buffering effect.

It should be noted that the horn 10 provided herein may be an ultrasonic horn to achieve ultrasonic welding.

The embodiment of the application also provides a welding device 20, the welding device 20 comprises a welder body 21 and the welding head 10, and the mounting end 11 is mounted on the welder body 21.

Please refer to fig. 2-12 according to some embodiments of the present application.

The present embodiment provides a welding head 10, the welding head 10 having a mounting end 11, the welding head 10 including a main weldment 110 and a supplementary weldment 120. In the first direction, an end of the main welding portion 110 facing away from the mounting end 11 is provided with a main welding tooth 111. The auxiliary welding part 120 is located at a side of the main welding part 110, and an end of the auxiliary welding part 120 away from the mounting end 11 is provided with an auxiliary welding tooth 121 along the first direction. Wherein the auxiliary welding teeth 121 are closer to the mounting end 11 than the main welding teeth 111 in the first direction. The end of the auxiliary welding part 120, which is far away from the mounting end 11, forms a first end surface 122, the auxiliary welding teeth 121 are disposed on the first end surface 122, the auxiliary welding part 120 has a connecting end 123 and an edge end 124 which are oppositely arranged along the second direction, and the connecting end 123 is connected to the main welding part 110; the first end surface 122 is gradually decreased in distance from the mounting end 11 in a first direction along a direction in which the connection end 123 is directed toward the edge end 124, and the second direction is perpendicular to the first direction.

The welding head 10 includes two auxiliary welding portions 120, and the two auxiliary welding portions 120 are disposed on both sides of the main welding portion 110 along a second direction perpendicular to the first direction.

The sub-pad 120 is disposed around the main pad 110. The auxiliary welding part 120 includes a plurality of connecting sections 126 and a plurality of auxiliary welding sections 125 arranged around the main welding part 110, and two adjacent auxiliary welding sections 125 are connected by one connecting section 126 in the circumferential direction of the main welding part 110, and one auxiliary welding section 125 is transited to the other auxiliary welding section 125 through an arc of one connecting section 126 in the two adjacent auxiliary welding sections 125.

The welding head 10 has a main welding part 110 and a sub welding part 120, and during welding, the main welding tooth 111 of the main welding part 110 is in sufficient contact with the workpiece to form a main welding area 310 for sufficient welding on the workpiece, and the sub welding tooth 121 of the sub welding part 120 is closer to the mounting end 11 than the main welding tooth 111, so that contact with the workpiece is insufficient, and a buffer area 320 for insufficient welding is formed on the workpiece. Therefore, the buffer area 320 is arranged between the unwelded area and the main welding area 310 on the workpiece for buffer transition, and abrupt shearing force between the main welding area 310 and the unwelded area can be avoided when the workpiece is stressed, so that the workpiece is not easy to break between the main welding area 310 and the unwelded area during assembly. The end of the auxiliary welding part 120, which is far away from the mounting end 11, forms a first end surface 122, the auxiliary welding teeth 121 are arranged on the first end surface 122, the auxiliary welding part 120 has a connecting end 123 and an edge end 124 which are oppositely arranged along the second direction, and the connecting end 123 is connected to the main welding part 110; the first end surface 122 is gradually decreased in distance from the mounting end 11 in a first direction along a direction in which the connection end 123 is directed toward the edge end 124, and the second direction is perpendicular to the first direction.

The auxiliary welding parts 120 are formed on the two sides of the main welding part 110 along the second direction, so that the buffer areas 320 are formed on the two sides of the main welding area 310 on the workpiece respectively after welding, the buffer effect is improved, and the workpiece is not prone to being broken between the main welding area 310 and an unwelded area during assembly. Two adjacent auxiliary welding sections 125 are in arc transition through the connecting section 126, so that after welding, the areas welded by the two auxiliary welding sections 125 and the area welded by the connecting section 126 on the workpiece can also be in arc transition, and the stress concentration of the buffer area 320 is reduced.

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, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bonding tool having a mounting end, the bonding tool comprising:

the main welding part is provided with main welding teeth at one end, deviating from the mounting end, of the main welding part along a first direction;

the auxiliary welding part is positioned on the side part of the main welding part, and one end of the auxiliary welding part, which is far away from the mounting end, is provided with auxiliary welding teeth along the first direction;

wherein, along the first direction, the auxiliary welding teeth are closer to the mounting end than the main welding teeth.

2. The bonding tool of claim 1, wherein an end of the supplementary bonding portion facing away from the mounting end forms a first end surface, the supplementary bonding tooth being disposed on the first end surface, the supplementary bonding portion having a connecting end and an edge end oppositely disposed in a second direction, the connecting end being connected to the main bonding portion;

the first end face is gradually reduced in distance from the mounting end in a first direction along a direction in which the connecting end points to the edge end, and the second direction is perpendicular to the first direction.

3. A horn according to claim 2 wherein the first end face is a bevel or a contour arranged at an incline.

4. A horn according to any one of claims 1 to 3 wherein, in the first direction, the maximum distance between the primary tooth and the secondary tooth is L such that: l is more than 0 and less than or equal to 3mm.

5. A welding head according to any one of claims 1 to 3, characterised in that the supplementary weld is located to one side of the main weld in a second direction, the length of the supplementary weld in the second direction being smaller than the length of the main weld in the second direction, the second direction being perpendicular to the first direction.

6. A weld head according to claim 1, characterised in that the weld head comprises two of the supplementary welds, which are arranged on either side of the main weld in a second direction, which is perpendicular to the first direction.

7. A welding head according to claim 6, characterized in that, in the first direction, the maximum distance between a secondary tooth on one of the secondary welding portions and the primary tooth is L1, and the maximum distance between a secondary tooth on the other secondary welding portion and the primary tooth is L2, so that L1 ≠ L2.

8. The welding head according to claim 7, wherein an end of the auxiliary welding part facing away from the mounting end forms a first end surface, the auxiliary welding tooth is arranged on the first end surface, and the first end surface is an arc surface;

the curvature of the first end surface of one of the auxiliary welding parts is not equal to the curvature of the first end surface of the other auxiliary welding part.

9. The horn of claim 6, wherein an end of the secondary weld portion facing away from the mounting end forms a first end surface, the secondary weld tooth being disposed on the first end surface;

the first end face of one auxiliary welding part is an inclined face, and the first end face of the other auxiliary welding part is an arc face.

10. The weld head of claim 1, wherein the supplementary weld is disposed around the main weld.

11. A welding head according to claim 10, wherein said supplementary welding portion includes a plurality of connecting segments and a plurality of supplementary welding segments provided around said main welding portion, adjacent two of said supplementary welding segments being connected by one of said connecting segments in a circumferential direction of said main welding portion, and one of said supplementary welding segments being transited to the other of said supplementary welding segments by one of said connecting segment arcs.

12. The horn of claim 11 wherein the outer side of the minor segments is planar.

13. The horn of claim 12 wherein the projection of the supplementary weld in the first direction is racetrack shaped.

14. The weld head of claim 1, wherein the weld head includes a plurality of the supplementary welds, the plurality of supplementary welds being arranged along a circumference of the main weld.

15. A welding device, comprising:

a welder body;

the weld head of any one of claims 1 to 14, the mounting end being mounted to the welder body.