CN221621115U - Ultrasonic welding head, ultrasonic welding device and battery production line - Google Patents

Abstract

The embodiment of the application provides an ultrasonic welding head, an ultrasonic welding device and a battery production line. The ultrasonic welding head comprises a welding part, wherein the welding part is provided with a working surface; the welding part comprises a boss, welding teeth and a plurality of side walls, the boss is convexly arranged on the working surface, the boss is provided with a welding surface, the area of the welding surface is smaller than that of the working surface, the welding teeth are convexly arranged on the welding surface, the plurality of side walls are arranged around the working surface, and an arc is transited between the side walls and the working surface. The technical scheme provided by the application can reduce the risk of fracture of the workpiece to be welded.

Description

Ultrasonic welding head, ultrasonic welding device and battery production line

Technical Field

The application relates to the technical field of ultrasonic welding, in particular to an ultrasonic welding head, an ultrasonic welding device and a battery production line.

Background

In the battery manufacturing process, an ultrasonic welding device is required. The ultrasonic welding device is generally provided with welding teeth on the working plane of an ultrasonic welding head, and the welding teeth are contacted with and drive the workpiece to be welded to vibrate in a reciprocating ultrasonic mode so as to enable the workpiece to be welded to vibrate in an ultrasonic mode, rub and heat and weld. When the ultrasonic welding head is used for welding workpieces to be welded, the workpieces to be welded are easy to break.

Disclosure of utility model

The application provides an ultrasonic welding head, an ultrasonic welding device and a battery production line, which can reduce the risk of fracture of a workpiece to be welded.

The application is realized by the following technical scheme:

In a first aspect, an embodiment of the present application provides an ultrasonic welding head, the ultrasonic welding head including a welding portion, one end of the welding portion having a working face; the welding part comprises a boss, welding teeth and a plurality of side walls, the boss is convexly arranged on the working surface, the boss is provided with a welding surface, and the area of the welding surface is smaller than that of the working surface; the welding teeth are convexly arranged on the welding surface, a plurality of side walls are arranged around the working surface, and arc transition is carried out between the side walls and the working surface.

In the technical scheme of the embodiment of the application, the boss is arranged on the working surface, the welding teeth are arranged on the welding surface on one side of the boss far away from the working surface, when a workpiece to be welded is taken as a tab, the welding teeth of the welding surface are firstly contacted with the tab during welding, and after the welding teeth are pressed against the tab, the boss is contacted with the tab. On the one hand, as the welding part is continuously pressed down, the area of the working surface is larger than that of the welding surface of the boss, the boss can play a role in transition buffering between the welding teeth and the working surface, and the pressure intensity of the tab extruded by the welding part is reduced, so that the purpose of preventing the welding part from continuously falling down to press the tab is achieved. On the other hand, a step structure is formed between the boss and the working surface, so that the step structure is formed at the raised part of the edge of the welding and printing area of the tab, and a large height difference is not formed at the raised part of the edge of the welding and printing area of the tab, thereby reducing the risk of fracture in the tab welding process. The side wall and the working surface are in arc transition, when the brittleness of the workpiece to be welded is large, and the working surface of the welding part is in contact with the workpiece to be welded, the occurrence of edges after the working surface is in contact with the workpiece to be welded can be reduced, and the risk of cracking of the workpiece to be welded caused by the propping of the edges is further reduced.

According to some embodiments of the application, the boss includes a plurality of sub-bosses arranged in a stacked arrangement along a first direction, the plurality of sub-bosses having areas that gradually decrease from the working face toward the welding face, the first direction being a direction from the working face to the welding face.

In the scheme, the lug boss is a plurality of sub-lug bosses, the area of each sub-lug boss is gradually reduced in the direction of the working face pointing to the welding face, and the multi-stage step structure can be formed at the raised position of the edge of the welding area of the lug, so that the continuity of the height difference of the raised position of the edge of the lug is better, and the risk of fracture of a workpiece to be welded is reduced. And each sub-boss can be pressed step by step and wait to weld the work piece, can also make same welded part be applicable to the welding demand of waiting to weld the different supplies of work piece, and the welding effect is better, and the application scope of welded part is wider.

According to some embodiments of the application, the sub-boss includes an end face and a side face, the side face is disposed around the periphery of the end face, one end of the side face in a first direction is connected to the end face, the other end of the side face in the first direction is connected to the end face of an adjacent sub-boss, or the other end of the side face in the first direction is connected to the working face; in at least one sub boss, the side surface and the end surface are in arc transition.

In the scheme, the arc transition is carried out between the side surface and the end surface of the sub-boss, so that the probability of forming an edge angle or a sharp angle after the sub-boss enters the workpiece to be welded is reduced, and the risk of cracking the workpiece to be welded due to the abutting of the edge angle or the sharp angle is reduced.

According to some embodiments of the application, the side surface comprises a plurality of first side surfaces, the plurality of first side surfaces are connected end to end along the circumferential direction of the end surface, and two adjacent first side surfaces are in arc transition.

In the scheme, arc transition between two adjacent first side surfaces can reduce the generation of the edge angle of the workpiece to be welded when the sub-boss is pressed down, and the risk of cracking the workpiece to be welded caused by the abutting of the edge angle is reduced.

According to some embodiments of the application, along a first direction, the first side surface comprises a first arc surface and a second arc surface which are distributed in sequence, the first arc surface connects the end surface with the second arc surface, and the second arc surface connects the first arc surface with the end surface or the working surface of the adjacent sub-boss; the first arc-shaped surface is outwards protruded in the direction of the center of the back ion boss, and the second arc-shaped surface is inwards concavely arranged in the direction of the center of the back ion boss.

In the scheme, through including first arcwall face and second arcwall face with first side, first arcwall face and second arcwall face connect gradually, and first arcwall face and second arcwall face are smooth curve, and first arcwall face and second arcwall face homoenergetic are enough gradually with the area of contact of linear mode increase adjacent sub-boss, not only can reduce the risk of first side and waiting to weld the stress concentration of work piece contact department, can also reduce the sub-boss and push down the production of waiting to weld behind the work piece edges and corners, have reduced the risk that leads to waiting to weld the work piece fracture because of edges and corners support to press. And, first arcwall face evagination sets up, and second arcwall face indent sets up, and the second arcwall face is compared in first arcwall face, and the second arcwall face can more accept and suppress the material that welds tooth department overflows, and then further reduces the risk of waiting to weld the work piece arch to crack.

According to some embodiments of the application, the difference in height between two adjacent sub-bosses in the first direction is 0.1mm-0.5mm.

In the scheme, the height difference between each stage of sub-boss is controlled within 0.1-0.5 mm, when the welding part is in welding butt pressing with the workpiece to be welded, larger break difference cannot be formed at the raised part of the welding area of the workpiece to be welded, the processing is simple, and the incoming material requirements of different workpieces to be welded are met. When the height difference between the sub-bosses is smaller than 0.1mm, the height difference of the factor bosses is too small, the processing difficulty is high, and the buffering effect of the workpiece to be welded is limited. When the height difference between the sub-bosses is larger than 0.5mm, the height difference of each level of sub-steps of the step structure formed at the raised part of the edge of the welding area of the workpiece to be welded is larger, and the risk of fracture in the tab welding process is increased.

According to some embodiments of the application, the heights of the respective sub-bosses are equal.

In the scheme, the heights of the sub-bosses are equal, and the heights of all levels of the step structures formed at the raised positions of the edges of the welding areas of the workpieces to be welded are equal, so that the height difference of the raised positions of the edges of the welding areas of the workpieces to be welded is increased step by step, the stress transmission is more uniform, and the risk of fracture in the welding process of the tabs is reduced.

According to some embodiments of the application, the welding surface is arched protruding away from the working surface.

In the scheme, the welding surface is in a convex arch shape deviating from the working surface, so when the welding surface of the welding part is propped against the workpiece to be welded and drives the workpiece to be welded to vibrate reciprocally, the arch surface is enabled to move reciprocally along the welding part, when the welding surface is inclined due to friction force, the propping force of the welding surface on the front part or the rear part of the reciprocating vibration direction to the workpiece to be welded can be reduced, the risk that cracks or breaks occur on the front part or the rear part of a welding area of the workpiece to be welded is reduced, the effect of effectively protecting the workpiece to be welded is achieved, and the risk that the workpiece to be welded is broken by the extrusion of the welding surface is reduced.

According to some embodiments of the application, the tooth includes a root near one end of the weld face, the junction of the root surface and the weld face being a smooth curve.

In the scheme, the joint of the surface of the tooth root and the welding surface is a smooth curved surface, the smooth curved surface is in a gradual transition shape, and the risk of stress concentration at the contact position of the edge of the tooth root and the welding surface can be reduced, so that the structural strength of the joint of the welding tooth and the welding surface is ensured. And when the welding teeth and the welding surface are propped against the workpiece to be welded, the risk of forming edges and corners on the workpiece to be welded can be reduced, and the structural strength of the workpiece to be welded is better ensured.

In a second aspect, an embodiment of the present application further provides an ultrasonic welding apparatus, including the ultrasonic welding head of any one of the foregoing embodiments.

In a third aspect, an embodiment of the present application further provides a battery production line, including the ultrasonic welding head of any one of the preceding embodiments or the aforementioned ultrasonic welding device.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an ultrasonic welding apparatus according to some embodiments of the present application;

FIG. 2 is a schematic illustration of an ultrasonic welding head according to some embodiments of the present application;

FIG. 3 is an enlarged schematic view of FIG. 2A;

FIG. 4 is a schematic view of a portion of a welded portion (the welded surface is a plane, and the end surfaces and the working surfaces of the sub-bosses are arched surfaces) according to other embodiments of the present application;

FIG. 5 is a schematic view of a portion of a welded portion (the welded surface, the end surfaces of the sub-bosses, and the working surface are all arcuate surfaces) according to still other embodiments of the present application;

FIG. 6 is a schematic view of an ultrasonic welding head according to still other embodiments of the present application;

FIG. 7 is an enlarged schematic view of B in FIG. 6;

fig. 8 is a schematic view of a part of the structure of the welded portion in fig. 6.

Icon: 100-ultrasonic welding head; 10-welding part; 11-working surface; 12-side walls; 20-a boss; 21-sub-bosses; 212-end face; 213—a welding face; 214-a first side; 2141—a first arcuate surface; 2143-a second arcuate surface; 216-a first sub-boss; 217-second sub-boss; 218-a first arcuate segment; 219-a second arcuate segment; 30-welding teeth; 31-root; 40-a support body; 200-an ultrasonic welding device; 201-a base; 202, welding a seat; 300-a workpiece to be welded; 301-a solder printing area; z-a first direction; x-second direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

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 in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

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

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

The term "plurality" as used herein means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

At present, ultrasonic welding is also called ultrasonic welding, and the ultrasonic welding device drives a welding head to drive a workpiece to be welded to vibrate in an ultrasonic reciprocating mode, so that the workpiece to be welded generates heat by friction, and the contact parts of the workpiece to be welded are connected by heating and melting welding. When the ultrasonic welding head vibrates back and forth in contact with a workpiece to be welded, reverse acting force is generated on the ultrasonic welding head, so that the ultrasonic welding head inclines relative to the welding seat, and when the ultrasonic welding device is used for welding workpieces with thinner thickness such as foil materials, for example, when the electrode lugs of a battery are welded with the adapter plate, cracks are easily caused at the front part or the rear part of a welding area, and even the workpieces are broken.

The ultrasonic welding can be used for welding workpieces to be welded with thin thickness such as foil, and the types of the workpieces to be welded can be various, for example, the ultrasonic welding can be used for welding the tab and the switching piece, and the workpieces to be welded are not limited to the tab.

Based on the above consideration, in order to reduce the risk of cracking of a workpiece to be welded, the application designs an ultrasonic welding head, wherein the ultrasonic welding head comprises a welding part, a boss and welding teeth, and one end of the welding part is provided with a working surface; the boss is convexly arranged on the working surface, the boss is provided with a welding surface, and the area of the welding surface is smaller than that of the working surface; the welding teeth are convexly arranged on the welding surface.

In such ultrasonic welding head, wait to weld the kind of work piece and can be multiple, for example, when being applied to the utmost point ear welding, through being provided with the boss on the working face, the tooth that welds sets up on the welding face of keeping away from working face one side on the boss, when waiting to weld the work piece and welds, along with the continuous depression of welding portion, because the area of working face is greater than the area of the welding face of boss, the boss can play the effect of transition buffering between tooth and working face, the utmost point ear receives the extruded pressure of welding portion to reduce to play the purpose that prevents welding portion to continue the decline extrusion utmost point ear. In addition, a step structure is formed between the boss and the working surface, so that the step structure is formed at the raised part of the edge of the welding and printing area of the tab, and a large height difference is not formed at the raised part of the edge of the welding and printing area of the tab, so that the risk of fracture in the tab welding process is reduced.

Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of an ultrasonic welding head according to some embodiments of the present application; fig. 3 is an enlarged schematic view of a in fig. 2. The ultrasonic welding head 100 includes a welding portion 10, one end of the welding portion 10 having a working surface 11; the welding portion 10 includes a boss 20, a welding tooth 30 and a plurality of side walls 12, the boss 20 is convexly arranged on the working surface 11, the boss 20 is provided with a welding surface 213, the area of the welding surface 213 is smaller than that of the working surface 11, the welding tooth 30 is convexly arranged on the welding surface 213, the plurality of side walls 12 are arranged around the working surface 11, and an arc transition is formed between the side walls 12 and the working surface 11.

The working surface 11 may be provided at both ends of the welded portion 10 in the longitudinal direction. The welding surface 213 is a surface of the boss 20 on a side away from the working surface 11. The number of the teeth 30 may be one or more. Alternatively, the number of the welding teeth 30 is plural, and the plurality of welding teeth 30 are spaced apart on the welding surface 213.

The boss 20 may be located at a middle position of the working surface 11 on the working surface 11, or may be located off-center from the working surface 11, i.e., the boss 20 is located eccentrically. Alternatively, the boss 20 is located at the center of the working surface 11.

The area of the working surface 11 may be the area of the area defined by the edges of the working surface 11, including the area of the area occupied by the boss 20. The area of the welding surface 213 refers to the area of the surface of the boss 20 on the side away from the working surface 11, that is, the area surrounded by the edges of the welding surface 213.

The arc transition between the side wall 12 and the working surface 11 means that the junction of the side wall 12 and the working surface 11 is an arc surface.

The ultrasonic welding head 100 further includes a support body 40, and the welding portion 10 is mounted on the support body 40. The supporting body 40 is used for fixing and supporting the welding part 10 and connecting other parts of the ultrasonic welding device, and the supporting body 40 is arranged so as to support the welding part 10, so that the welding part 10 can be conveniently installed and fixed, and the welding part 10 can be conveniently used.

In the technical solution of the embodiment of the present application, by providing the boss 20 on the working surface 11, and disposing the welding teeth 30 on the welding surface 213 on the side of the boss 20 far from the working surface 11, taking the workpiece 300 to be welded as a tab as an example, during welding, the welding teeth 30 of the welding surface 213 contact with the tab first, and after the welding teeth 30 abut against the tab, the boss 20 starts to contact with the tab. On the one hand, as the welding part 10 is continuously pressed down, the area of the working surface 11 is larger than that of the welding surface 213 of the boss 20, the boss 20 can play a role of transition buffer between the welding teeth 30 and the working surface 11, and the pressure of the tab extruded by the welding part 10 is reduced, so that the purpose of preventing the welding part 10 from continuously falling down to press the tab is achieved. On the other hand, a step structure is formed between the boss 20 and the working surface 11, so that the step structure is formed at the raised part of the edge of the welding area 301 of the tab, and a larger height difference is not formed at the raised part of the edge of the welding area 301 of the tab, thereby reducing the risk of fracture in the tab welding process. The arc transition between the side wall 12 and the working surface 11 can reduce the generation of the edge angle after the working surface 11 contacts with the workpiece 300 to be welded when the brittleness of the workpiece 300 to be welded is large and the working surface 11 of the welding part 10 contacts with the workpiece 300 to be welded, so that the risk of cracking the workpiece 300 to be welded caused by the abutting of the edge angle is reduced.

Referring to fig. 3, fig. 3 is an enlarged schematic view of fig. 2a according to some embodiments of the present application. The boss 20 includes a plurality of sub-bosses 21, and the plurality of sub-bosses 21 are stacked in a first direction Z, which is a direction from the working surface 11 to the welding surface 213, in which the areas of the plurality of sub-bosses 21 gradually decrease from the working surface 11 to the welding surface 213.

The first direction Z is a direction from the working surface 11 to the welding surface 213, and may be a direction from the welding surface 213 to the working surface 11, that is, the first direction Z may be a longitudinal direction of the welded portion 10.

The plurality of sub-bosses 21 are stacked in order along the first direction Z, and the plurality of sub-bosses 21 constitute the boss 20. The area of the sub-boss 21 may be the area of the region defined by the edges of the sub-boss 21, the area of the sub-boss 21 including the area of the region occupied or covered by the adjacent sub-boss 21 being directed by the working face 11 in the direction of the welding face 213.

The number of sub-bosses 21 may be two, three, four, or the like. Alternatively, the number of sub-bosses 21 is two.

The cross-sectional shape of the sub-boss 21 may be various, and the cross-sectional shape of the sub-boss 21 may be circular, square, triangular, or the like. Alternatively, the cross-sectional shape of the sub-boss 21 is square.

During welding, the ultrasonic welding head can be provided with enough welding parameters to ensure that the workpiece 300 to be welded with high toughness is firmly welded and no cold joint occurs. Still take work piece 300 to be welded as the utmost point ear for example, when the incoming material brittleness of utmost point ear is great, in the welding process, at least one of a plurality of sub-bosss 21 on the welding part 10 can be pressed into the inside of utmost point ear step by step, because there is the difference in height between each sub-boss 21, boss 20 can form step-like structure in the uplift position department of the welding mark district 301 edge of utmost point ear for the difference in height of the uplift position of utmost point ear edge reduces, and can not form great difference in height at the uplift of welding mark district 301 edge of work piece 300 to be welded, has reduced the risk of utmost point ear fracture.

By adopting the boss 20 as a multi-stage sub-boss, the working surface 11 points to the welding surface 213, the area of the sub-boss 21 is gradually reduced, and not only can a stepped structure be formed at the raised position of the edge of the welding area 301 of the tab, so that the continuity of the height difference of the raised position of the edge of the tab is better, and the risk of fracture of the workpiece 300 to be welded is reduced. Moreover, each sub-boss 21 can be pressed against the workpiece 300 step by step, so that the same welding part 10 can be suitable for welding requirements of different materials of the workpiece 300 to be welded, the welding effect is better, and the application range of the welding part 10 is wider.

It should be noted that, the same welding portion 10 can be suitable for the welding requirements of different materials of the workpiece 300 to be welded, which means that the welding requirements of different materials of the workpiece 300 to be welded can be met due to the arrangement of the multi-stage sub-bosses 21. During the welding process, not all the sub-bosses 21 are completely pressed into the workpiece 300 to be welded, specifically according to the toughness difference of the incoming materials of the workpiece 300 to be welded.

Taking the number of sub-bosses 21 as two as an example, a first sub-boss 216 and a second sub-boss 217, respectively, the welding teeth 30 are disposed on the first sub-boss 216. When the toughness of the incoming material of the workpiece 300 to be welded is relatively high, then the tooth 30 or the first sub-boss 216 adjacent to the tooth 30 may partially press against the workpiece 300 to be welded. While the incoming material of the workpiece 300 is generally brittle, the tooth 30 and the first sub-boss 216 adjacent to the tooth 30 may all press against the workpiece 300. When the incoming material of the workpiece 300 to be welded is more brittle, the welding tooth 30 and the first sub-boss 216 and the second sub-boss 217 adjacent to the welding tooth 30 can completely press against the workpiece 300 to be welded.

According to some embodiments of the present application, please continue to refer to fig. 2, the sub-boss 21 includes an end face 212 and a side face, the side face is disposed around the periphery of the end face 212, one end of the side face in the first direction Z is connected to the end face 212, the other end of the side face in the first direction Z is connected to the end face 212 of the adjacent sub-boss 21, or the other end of the side face in the first direction Z is connected to the working face 11. In at least one of the sub-projections 21, the side surface is in circular arc transition with the end surface 212.

The end face 212 of the sub-boss 21 on the side farthest from the working face 11 among the plurality of sub-bosses 21 is a welding face 213.

When the shape of the sub-boss 21 is a rectangular boss, the outline shape of the end face 212 of the sub-boss 21 is square, and then the number of sides is four, and four sides are disposed around the end face 212. In the at least one sub-boss 21, the arc transition between the side surface and the end surface 212 refers to the arc transition between the side surface and the end surface 212 of the at least one sub-boss 21 in the plurality of sub-bosses 21. Alternatively, the side surface of each sub-boss 21 may be rounded with the end surface 212.

The arc transition between the side surface and the end surface 212 means that the junction between the side surface and the end surface 212 is an arc surface.

The arc transition between the side surface of the sub-boss 21 and the end surface 212 can reduce the probability of forming an edge angle or a sharp angle on the peripheral side of the sub-boss 21 after the sub-boss 21 enters the workpiece 300 to be welded, and reduce the risk of cracking the workpiece 300 to be welded caused by the abutting of the edge angle or the sharp angle.

Referring to fig. 3, according to some embodiments of the present application, the side surface includes a plurality of first side surfaces 214, the plurality of first side surfaces 214 are connected end to end along a circumferential direction of the end surface 212, and two adjacent first side surfaces 214 are in arc transition.

The number of first sides 214 may be three, four, five, etc., depending on the shape of the sub-boss 21. When the cross-sectional shape of the sub-boss 21 is square, then the number of the first sides 214 is four. The arc transition of two adjacent first sides 214 refers to the arc at the junction of two adjacent first sides 214.

The arc transition is adopted between the two adjacent first side surfaces 214, so that after the side wall 12 of the sub-boss 21 is pressed into the workpiece 300 to be welded, the generation of the corner angle of the workpiece 300 to be welded, which is caused by the pressing of the corner angle, can be reduced, and the risk of cracking the workpiece 300 to be welded is reduced.

Referring to fig. 6, 7 and 8, fig. 6 is a schematic structural diagram of an ultrasonic welding head according to still other embodiments of the present application; FIG. 7 is an enlarged schematic view of B in FIG. 6; fig. 8 is a schematic view of a part of the structure of the welded portion in fig. 6. Along the first direction Z, the first side 214 includes a first arc surface 2141 and a second arc surface 2143 that are distributed in sequence, the first arc surface 2141 connects the end surface 212 and the second arc surface 2143, and the second arc surface 2143 connects the first arc surface 2141 and the end surface 212 or the working surface 11 of the adjacent sub-boss 21; the first arc surface 2141 is convexly arranged toward the center of the back ion boss 21, and the second arc surface 2143 is concavely arranged toward the direction close to the center of the sub-boss 21.

The first curved surface 2141 refers to a surface of the first side surface 214 near the end surface 212. The second arcuate surface 2143 refers to the first side surface 214 being adjacent to the end surface 212 or the working surface 11 of the adjacent sub-boss 21. The first arc surface 2141 is arranged in a convex manner, and the second arc surface 2143 is arranged in a concave manner, so that the first arc surface 2141 and the second arc surface 2143 are in an S shape, i.e. are in a wave shape.

By including the first side 214 with the first arc surface 2141 and the second arc surface 2143, the first arc surface 2141 and the second arc surface 2143 are sequentially connected, the first arc surface 2141 and the second arc surface 2143 are smooth curves, the contact area of the adjacent sub-boss 21 can be gradually increased in a linear manner by the first arc surface 2141 and the second arc surface 2143, the risk of stress concentration at the contact position of the first side 214 and the workpiece 300 to be welded can be reduced, the generation of the rear edges of the workpiece 300 to be welded due to the fact that the sub-boss 21 is pressed down can be reduced, and the risk of cracking of the workpiece 300 to be welded due to the abutting of edges is reduced. Moreover, the first arc surface 2141 is arranged in a convex manner, the second arc surface 2143 is arranged in a concave manner, and compared with the first arc surface 2141, the second arc surface 2143 can accommodate and press overflowed materials at the welding teeth 30, so that the risk of arching and cracking of the workpiece 300 to be welded is further reduced.

Of course, referring to fig. 7, the first side 214 may further include a plurality of first arc segments 218 and a plurality of second arc segments 219 along the circumferential direction of the sub-boss 21, where the first arc segments 218 and the second arc segments 219 are alternately arranged to form the wavy first side 214 on the side surface of the sub-boss 21.

Through in the circumference of sub boss 21, first arc section 218 and second arc section 219 set up in turn for adjacent sub boss 21 is the wave, compares in the side of sub boss 21 for the plane, has increased sub boss 21 in the ascending path length of circumference, and then has increased sub boss 21 and the area of contact of waiting to weld work piece 300, and then can reduce sub boss 21 and the pressure or the stress of waiting to weld work piece 300 contact, has reduced the risk that waiting to weld work piece 300 to take place the fracture when the welding.

According to some embodiments of the application, the difference in height between two adjacent sub-bosses 21 along the first direction Z is 0.1mm-0.5mm.

The height difference between two adjacent sub-bosses 21 can be any value between 0.1mm and 0.5mm, and the processing is convenient on the premise of ensuring the buffering effect. Illustratively, the height difference of the adjacent two sub-bosses 21 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, or the like.

The height difference between each sub-boss 21 is controlled within 0.1mm-0.5mm, when the welding part 10 is welded and pressed against the workpiece 300 to be welded, a larger break difference is not formed at the raised part of the welding zone 301 of the workpiece 300 to be welded, the processing is simple, and the incoming material requirements of different workpieces 300 to be welded are met. When the height difference between the sub-bosses 21 at each stage is smaller than 0.1mm, the height difference of the factor boss 21 is too small, the processing difficulty is large, and the buffering effect of the workpiece 300 to be welded is limited. When the height difference between the sub-bosses 21 at each stage is greater than 0.5mm, the height difference of each stage of the step structure formed at the raised portion of the edge of the welding area 301 of the workpiece 300 to be welded is greater, increasing the risk of breakage during the welding process of the workpiece 300 to be welded.

According to some embodiments of the application, the heights of the respective sub-bosses 21 are equal.

The equal height of the respective sub-bosses 21 means that the protruding heights of the respective sub-bosses 21 in the first direction Z are equal.

By equalizing the heights of the sub-bosses 21, the heights of the steps of the step structure formed at the raised part of the edge of the welding area 301 of the workpiece 300 to be welded are equalized, so that the stress transmission is more uniform, and the risk of fracture in the tab welding process is reduced.

Of course, the heights of the sub-bosses 21 may be different, that is, the heights of the sub-bosses 21 may be completely different, or the heights of a part of the sub-bosses 21 may be equal to the heights of a part of the sub-bosses 21, and the heights of a part of the sub-bosses 21 may be different from each other, depending on the actual situation.

The welding surface 213, the end surface 212 of the sub-boss 21, or the working surface 11 may be a flat surface or an arcuate surface in the second direction X. The second direction X is a reciprocating direction parallel to the reciprocating vibration of the welding portion 10 when in use, and is perpendicular to the first direction Z.

The surfaces of the working surface 11, the sub-boss 21, and the welding surface 213 are combined in the following ways.

In the first case, referring to fig. 3, the welding surface 213 is planar, and the end surface of the sub-boss 21 and the working surface 11 are planar.

In the second case, referring to fig. 4, fig. 4 is a schematic view of a part of a welded portion (a welding surface is a plane, and an end surface and a working surface of a sub-boss are arched surfaces) according to other embodiments of the present application. That is, the welding surface 213 is a plane, and the end surface 212 of the sub-boss 21 and the working surface 11 are arcuate surfaces in the second direction X, the arcuate surfaces being convex in a direction away from the working surface 11.

In a third case, referring to fig. 5, fig. 5 is a schematic view of a portion of a welding portion (a welding surface, a sub-boss, and a working surface are all arched surfaces) according to still another embodiment of the present application. The working surface 11 of the welded part 10, the end surface 212 of the sub-boss 21, and the welding surface 213 are all arcuate surfaces.

According to some embodiments of the present application, referring to fig. 5, the welding surface 213 is arched protruding away from the working surface 11.

The arch is formed by the welding surface 213 protruding to the side facing away from the working surface 11. Of course, the welding surface 213 may be arranged arcuately in the second direction X. The second direction X may be a reciprocating direction in which the welding portion 10 vibrates reciprocally when in use. The second direction X is perpendicular to the first direction Z.

Alternatively, the arch shape of the welding surface 213 may be convex from both sides of the second direction X of the welding surface 213 toward the middle of the welding portion, i.e., the welding surface 213 is curved in an arch shape. That is, in use, the middle of the welding surface 213 is convexly disposed toward the work piece 300 to be welded.

When the welding portion 10 drives the workpiece 300 to be welded to vibrate reciprocally in the second direction X, the workpiece 300 to be welded generates a reverse force to the welding portion 10 due to friction, and the welding portion 10 is deformed obliquely forward or backward in the second direction X under the reverse force, so that the welding surface 213 is inclined forward or backward in the second direction X. The welding surface 213 is arranged in an arch shape, two ends of the welding surface 213 along the second direction X are bent towards a direction away from the workpiece 300 to be welded, and when the welding surface 213 is inclined forwards or backwards along the second direction X, the extrusion acting force of the welding surface 213 along the two ends of the second direction X on the workpiece 300 to be welded is not excessive, so that the workpiece 300 to be welded is effectively protected.

The welding surface 213 is in a convex arch shape away from the working surface 11, so when the welding surface 213 of the welding part 10 is pressed against the workpiece 300 to be welded and drives the workpiece 300 to be welded to vibrate reciprocally along the second direction X, the arch shape of the welding surface 213 is enabled to follow the reciprocal moving direction of the welding part 10, when the welding surface 213 is inclined due to friction force, the pressing force of the welding surface 213 against the workpiece 300 to be welded at the front or rear of the reciprocal vibrating direction can be reduced, thereby reducing the risk of cracking or breaking at the front or rear of the welding zone 301 of the workpiece 300 to be welded, playing the role of effectively protecting the workpiece 300 to be welded, and reducing the risk of the workpiece 300 to be welded being broken by the pressing of the welding surface 213.

Referring to fig. 3, fig. 3 is an enlarged schematic view of fig. 2a according to some embodiments of the present application. The tooth 30 includes a root 31 near one end of the land 213, the junction of the surface of the root 31 and the land 213 being a smooth curve.

The tooth root 31 is the root of the tooth 30 on the side closer to the welding surface 213, and the tooth 30 is connected to the welding surface 213 through the heel. The smooth curved surface means that the surface at the junction of the tooth root 31 and the welding surface 213 is a cambered surface.

The joint of the surface of the tooth root 31 and the welding surface 213 is a smooth curved surface, and the smooth curved surface is in a gradual transition shape, so that the risk of stress concentration at the contact position of the edge of the tooth root 31 and the welding surface 213 can be reduced, and the structural strength of the joint of the welding tooth 30 and the welding surface 213 is ensured. In addition, when the welding teeth 30 and the welding surface 213 abut against the workpiece 300 to be welded, the risk of forming an edge angle on the workpiece 300 to be welded can be reduced, and the structural strength of the workpiece 300 to be welded can be better ensured.

According to some embodiments of the application, the shape of the tooth 30 is at least one of spherical, frustoconical and conical.

In the case where the number of the plurality of the teeth 30 is plural, the plurality of the teeth 30 may be all one of a sphere, a truncated cone, and a cone, or may be plural of a sphere, a truncated cone, and a cone, that is, a part of the plurality of the teeth 30 may be a sphere, and another part of the teeth 30 may be a truncated cone or a cone.

The shape of the welding teeth 30 can be in various modes, the selection is more flexible, the shape of the welding teeth 30 can be selected according to actual requirements, and the design and layout of the welding teeth 30 are convenient. When the shape of the welding teeth 30 is spherical, the sharpness of the welding teeth 30 can be reduced, so that the contact stress of the welding teeth 30 on the workpiece 300 to be welded is reduced, and the risk of damage to the workpiece 300 to be welded is reduced. When the shape of the welding teeth 30 is a truncated cone shape, the workpiece 300 to be welded can be better pressed, and the contact stress between the peripheral side of the welding teeth 30 and the workpiece 300 to be welded is reduced. When the shape of the welding teeth 30 is conical, the workpiece 300 to be welded can be better fixed or pressed.

According to some embodiments of the present application, the number of the welding teeth 30 is plural, and the plurality of welding teeth 30 are arranged in an array on the welding surface 213.

The plurality of welding teeth 30 are arranged on the welding surface 213 in an array manner, and may be distributed in a circular array manner or in a rectangular array manner. Optionally, a plurality of welding teeth 30 are arranged in an array on the welding surface 213. The specific size of the rectangular array formed by the plurality of teeth 30 is not limited, and is specific to the actual situation.

The plurality of welding teeth 30 are distributed in an array on the welding surface 213, so that the welding teeth 30 can be conveniently distributed, the intervals among the welding teeth 30 are regular, and the welding part 10 can be conveniently processed and manufactured.

According to some embodiments of the present application, the height of the protruding weld face 213 of each tooth 30 is equal.

The height of the tooth 30 protruding from the welding surface 213 refers to the distance between the side of the tooth 30 away from the welding surface 213 and the welding surface 213. The heights of the protruding welding surfaces 213 of the welding teeth 30 can be equal or unequal, and the welding teeth are specific according to the actual situation.

The plurality of welding teeth 30 are protruded out of the protruded welding surface 213 to be equal in height, so that the design and the processing of the welding teeth 30 can be facilitated, the depth of the welding teeth 30 pressed into the workpiece 300 to be welded is equal, the acting force of the welding teeth 30 on the workpiece 300 to be welded is more uniform, and the welding surface 213 and the welding teeth 30 can be used for driving the workpiece 300 to be welded to vibrate in a reciprocating manner.

Referring to fig. 1, an ultrasonic welding apparatus 200 includes an ultrasonic welding head 100 according to any one of the foregoing embodiments.

The ultrasonic welding apparatus 200 may further include a bonding pad 202, the bonding pad 202 being a component for supporting the workpiece 300 to be welded. The ultrasonic welding head 100 is a component for pressing the workpiece 300 to be welded against the welding seat 202 and driving the workpiece 300 to be welded to vibrate reciprocally. When in use, the workpiece 300 to be welded is arranged between the welding seat 202 and the ultrasonic welding head 100, the ultrasonic welding head 100 presses the workpiece 300 to be welded on the welding seat 202, and the ultrasonic welding head 100 vibrates reciprocally to drive the workpiece 300 to be welded to vibrate reciprocally, so that the workpieces 300 to be welded are in friction heating and welding connection.

In some embodiments, the ultrasonic welding apparatus 200 further includes a base 201, and the welding base 202 is mounted on the base 201, and the welding base 202 is supported and positioned by the base 201, so that the welding base 202 is mounted and fixed.

The embodiment of the application also provides a battery production line, which comprises the ultrasonic welding head 100 of any one of the previous embodiments or the ultrasonic welding device 200 of the previous embodiments.

In some embodiments, referring to fig. 2 and 3, an ultrasonic welding head 100 includes a welding portion 10, a boss 20 and a tooth 30, the welding portion 10 has a working surface 11, the boss 20 is convexly disposed on the working surface 11, the boss 20 has a welding surface 213, and an area of the welding surface 213 is smaller than an area of the working surface 11; the welding teeth 30 are arranged on the welding surface 213 in a protruding manner. The boss 20 includes a plurality of sub-bosses 21, and the plurality of sub-bosses 21 are stacked in a first direction Z, which is a direction from the working surface 11 to the welding surface 213, in which the areas of the plurality of sub-bosses 21 gradually decrease from the working surface 11 to the welding surface 213.

By arranging the boss 20 on the working surface 11, the boss 20 is in a structure of a plurality of sub-bosses 21, the area of each sub-boss 21 is gradually reduced, a stepped structure can be formed at the raised position of the edge of the welding zone 301 of the tab, the continuity of the height difference of the raised position of the edge of the tab is better, and the risk of fracture of the workpiece 300 to be welded is reduced. And each sub-boss 21 can be pressed into the workpiece 300 to be welded step by step, so that the same welding part 10 can be suitable for the welding requirements of different incoming materials of the workpiece 300 to be welded, the welding effect is better, and the application range of the welding part 10 is wider.

In some embodiments, the cross-sectional shape of the sub-boss 21 is square, the sub-boss 21 includes an end face 212 and a side face, the side face is disposed around the periphery of the end face 212, one end of the side face in the first direction Z is connected to the end face 212, the other end of the side face in the first direction Z is connected to the end face 212 of an adjacent sub-boss 21, or the other end of the side face in the first direction Z is connected to the working face 11; in at least one sub-boss 21, the side surface and the end surface 212 are in arc transition; the side surfaces comprise a plurality of first side surfaces 214, the plurality of first side surfaces 214 are connected end to end along the circumferential direction of the end surface 212, and two adjacent first side surfaces 214 are in arc transition; the height difference between two adjacent sub-bosses 21 is 0.1mm-0.5mm along the first direction Z, and the heights of the sub-bosses 21 are equal.

The arc transition between the side surface and the end surface 212 and the arc transition between the two adjacent first side surfaces 214 can reduce the probability of forming edges or sharp angles in the welding area of the workpiece to be welded after the sub-boss 21 is pressed against the workpiece to be welded 300, and reduce the risk of cracking the workpiece to be welded 300 caused by the pressing of the edges or sharp angles. The height difference between each sub-boss 21 is controlled within 0.1mm-0.5mm, when the welding part 10 is welded and pressed against the workpiece 300 to be welded, a larger break difference is not formed at the raised part of the welding zone 301 of the workpiece 300 to be welded, the processing is simple, and the incoming material requirements of different workpieces 300 to be welded are met. The heights of the sub-bosses 21 are equal, the heights of all levels of step structures formed at the raised positions of the edges of the welding areas 301 of the workpiece 300 to be welded are equal, so that the height difference of the raised positions of the edges of the welding areas 301 of the workpiece 300 to be welded is increased step by step, the stress transmission is more uniform, and the risk of fracture in the tab welding process is reduced.

In some embodiments, referring to fig. 5, the welding surface 213 is arched protruding away from the working surface 11; the weld 10 further includes a plurality of side walls 12, the plurality of side walls 12 being disposed around the periphery of the working surface 11, the side walls 12 being in circular arc transition with the working surface 11.

The welding surface 213 is in a protruding arch shape away from the working surface 11, so when the welding surface 213 of the welding part 10 is pressed against the workpiece 300 to be welded and drives the workpiece 300 to be welded to vibrate reciprocally along the second direction X, the arch surface is enabled to follow the reciprocal movement direction of the welding part 10, when the welding surface 213 is inclined due to friction force, the pressing force of the welding surface 213 on the front or rear of the workpiece 300 to be welded in the reciprocal vibration direction can be reduced, thereby reducing the risk of cracking or breaking on the front or rear of the welding area 301 of the workpiece 300 to be welded, playing the role of effectively protecting the workpiece 300 to be welded, and reducing the risk of the workpiece 300 to be welded being broken by the welding surface 213. The arc transition between the side wall 12 and the working surface 11 can reduce the generation of the edge angle after the working surface 11 is pressed against the workpiece 300 to be welded when the working surface 11 of the welding part 10 contacts with the workpiece 300 to be welded when the brittleness of the workpiece 300 to be welded is large, so that the risk of cracking the workpiece 300 to be welded caused by the pressing of the edge angle is reduced.

In some embodiments, the tooth 30 includes a root 31 near one end of the welding surface 213, the junction of the surface of the root 31 and the welding surface 213 being smoothly curved. The teeth 30 are spherical. The number of the welding teeth 30 is a plurality, and the welding teeth 30 are arranged on the welding surface 213 in an array rectangle. The height of the protruding welding surface 213 of each welding tooth 30 is equal.

The joint of the surface of the tooth root 31 and the welding surface 213 is a smooth curved surface, and the smooth curved surface is in a gradual transition shape, so that the risk of stress concentration at the contact position of the edge of the tooth root 31 and the welding surface 213 can be reduced, and the structural strength of the joint of the welding tooth 30 and the welding surface 213 is ensured. In addition, when the welding teeth 30 and the welding surface 213 abut against the workpiece 300 to be welded, the risk of forming an edge angle on the workpiece 300 to be welded can be reduced, and the structural strength of the workpiece 300 to be welded can be better ensured. When the shape of the welding teeth 30 is spherical, the sharpness of the welding teeth 30 can be reduced, so that the contact stress of the welding teeth 30 on the workpiece 300 to be welded is reduced, and the risk of damage to the workpiece 300 to be welded is reduced. The plurality of welding teeth 30 are distributed in a rectangular array on the welding surface 213, so that the welding teeth 30 can be conveniently distributed, the intervals among the welding teeth 30 are regular, and the welding part 10 can be conveniently processed and manufactured. The plurality of welding teeth 30 are protruded out of the protruded welding surface 213 to be equal in height, so that the design and the processing of the welding teeth 30 can be facilitated, the depth of the welding teeth 30 pressed into the workpiece 300 to be welded is equal, the acting force of the welding teeth 30 on the workpiece 300 to be welded is more uniform, and the welding surface 213 and the welding teeth 30 can be used for driving the workpiece 300 to be welded to vibrate in a reciprocating manner.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (11)

1. An ultrasonic welding head, comprising:

A welded part, one end of which is provided with a working surface;

Wherein the welded portion includes:

The boss is convexly arranged on the working surface and is provided with a welding surface, and the area of the welding surface is smaller than that of the working surface;

welding teeth are convexly arranged on the welding surface;

The side walls are arranged around the working surface, and arc transition is formed between the side walls and the working surface.

2. The ultrasonic welding head of claim 1, wherein the boss comprises:

The plurality of sub-bosses are arranged in a stacked mode along a first direction, the areas of the plurality of sub-bosses are gradually reduced from the working face to the welding face, and the first direction is from the working face to the welding face.

3. The ultrasonic welding head according to claim 2, wherein the sub-boss includes an end face and a side face, the side face being provided around a periphery of the end face, one end of the side face in the first direction being connected to the end face, the other end of the side face in the first direction being connected to the end face of an adjacent sub-boss, or the other end of the side face in the first direction being connected to the working face; in at least one of the sub-bosses, the side surface and the end surface arc transition.

4. The ultrasonic welding head of claim 3 wherein the side surface comprises a plurality of first side surfaces, the plurality of first side surfaces being joined end to end along the circumference of the end surface, adjacent ones of the first side surfaces being arcuate in transition.

5. The ultrasonic welding head of claim 4, wherein along the first direction, the first side surface comprises a first arcuate surface and a second arcuate surface that are sequentially distributed, the first arcuate surface connecting the end surface and the second arcuate surface, the second arcuate surface connecting the first arcuate surface and the end surface or the working surface of an adjacent sub-boss; the first arc-shaped surface is outwards protruded in the direction away from the center of the sub-boss, and the second arc-shaped surface is inwards concavely protruded in the direction close to the center of the sub-boss.

6. The ultrasonic welding head of claim 2, wherein a difference in height between adjacent two of the sub-bosses in the first direction is 0.1mm to 0.5mm.

7. The ultrasonic welding head of claim 2 wherein the heights of the respective sub-bosses are equal.

8. The ultrasonic welding head of claim 1, wherein the welding surface is arched projecting away from the working surface.

9. The ultrasonic welding head of claim 1, wherein the tooth comprises a root proximate one end of the weld face, the junction of the root surface and the weld face being a smooth curve.

10. An ultrasonic welding apparatus comprising an ultrasonic welding head according to any one of claims 1-9.

11. A battery production line, characterized by comprising an ultrasonic welding head according to any one of claims 1 to 9 or an ultrasonic welding device according to claim 10.