CN113001991A

CN113001991A - Welding tool for welding workpiece, welding method thereof, battery and electric device

Info

Publication number: CN113001991A
Application number: CN202110564080.3A
Authority: CN
Inventors: 豆建新; 鄢胜云; 黄标
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-06-22

Abstract

The application provides a welding tool, a welding method, a battery and a device for welding workpieces, wherein the welding tool comprises: the friction stir part is provided with a through hole which penetrates along the axis direction; the central moving part is arranged in the through hole and is in clearance fit with the friction stir part; the central moving part can move up and down and/or rotate left and right relative to the friction stir part along the central axis direction, and the friction stir part can move up and down and/or rotate left and right relative to the central moving part along the central axis direction. According to the welding tool and the welding method for the welding workpiece, the central moving part is arranged in the through hole of the friction stir part, thermoplastic workpiece materials are absorbed and extruded through the up-and-down movement of the central moving part in the welding process, so that the central keyhole at the tail part of a welding line is automatically filled in the welding process, manual repair welding is not needed, and the production efficiency is improved.

Description

Welding tool for welding workpiece, welding method thereof, battery and electric device

Technical Field

The application relates to the technical field of welding, in particular to a welding tool, a welding method, a battery and an electric device for welding workpieces.

Background

In the actual assembly process of the battery cell, after the electrode assembly is installed in the housing, the housing and the end cap assembly need to be welded into a whole. The welding of the shell and the end cover assembly usually adopts friction stir welding, but the welding mode can form a keyhole at the tail part of a welding seam of the workpiece, thereby affecting the welding quality of the workpiece. Therefore, in order to improve the welding quality, a manual repair welding process is generally required to be added, and the keyhole at the tail part of the welding seam is filled, so that the welding quality of the workpiece is reduced, the production efficiency of the power battery is also reduced, and the production cost of the battery is increased.

Disclosure of Invention

The present application is made in view of the above technical problems. The application provides a welding tool and a welding method for welding workpieces, which can automatically fill a keyhole at the tail part of a welding line in the welding process without manual repair welding, obviously improve the welding quality and the production efficiency, and reduce the production cost.

The present application provides in a first aspect a welding tool for welding workpieces, comprising: the friction stir part is provided with a through hole which penetrates along the axis direction; the central moving part is arranged in the through hole and is in clearance fit with the friction stir part; the central moving part can move up and down and/or rotate left and right relative to the friction stir part along the central axis, and the friction stir part can move up and down and/or rotate left and right relative to the central moving part along the central axis.

In one possible design, the stirring friction part comprises a shaft shoulder and a stirring pin, and the stirring pin is coaxially assembled and detachably connected with the shaft shoulder; wherein, the shaft shoulder drives the stirring pin when moving, and the motion direction of stirring pin is unanimous with the motion direction of shaft shoulder.

The stirring pin is detachably connected with the shaft shoulder, and after the stirring pin is abraded, only a new stirring pin needs to be replaced, the whole stirring pin does not need to be replaced, the operation is simple and convenient, and the cost is lower.

In one possible design, the shaft shoulder is connected with a first power source, and the shaft shoulder drives the stirring pin to move up and down and/or rotate left and right under the driving of the first power source.

The shaft shoulder is driven by the first power source to independently move up and down and rotate left and right, so that the shaft shoulder can perform friction stirring on a workpiece according to the requirement of a welding process.

In one possible design, the central moving part is connected with a second power source, and the central moving part moves up and down and/or rotates left and right relative to the shaft shoulder under the driving of the second power source.

The central moving part is driven by a second power source to independently move up and down and rotate left and right, and in the welding process, the central moving part is controlled to move, so that the workpiece material is sucked and the keyhole at the tail part of the welding seam is backfilled.

In one possible design, the center moving part and the probe reach the surface of the workpiece simultaneously when welding the workpiece.

The central moving part and the stirring pin reach the surface of the workpiece simultaneously, so that when the stirring pin starts to perform friction stirring on the workpiece and a generated plastic material enters a cavity formed in the central moving part and the through hole, air cannot be remained in the cavity.

In one possible design, the pin is rotated to a predetermined depth inside the workpiece and the welding tool is advanced in the welding direction to form a weld; the central moving part is driven by the second power source to move upwards along the direction of the central axis, so that part of workpiece materials generated by friction stirring of the workpiece enter a cavity of the through hole between the central moving part and the friction stirring part.

The workpiece material is introduced into the cavity, and a portion of the workpiece material may be stored within the cavity.

In one possible design, the central moving portion pushes the workpiece material in the cavity out and into the keyhole at the end of the weld by moving downward as the welding tool moves to a predetermined position on the workpiece.

The workpiece material in the cavity is extruded and pressed into the key hole at the tail part of the welding line, so that the key hole can be backfilled, the key hole does not need to be subjected to repair welding after welding, the welding process is saved, and the welding efficiency is improved.

In one possible design, the welding tool further includes a flash removal portion disposed at an outer periphery of the shoulder.

The flash removing part can clear flash and burrs generated in the welding process.

In one possible design, the flash removal part is fixedly connected to the shaft shoulder, and the flash removal part is fastened to the shaft shoulder by a fastening element during welding.

The flash removing part is detachably connected with the shaft shoulder, so that the flash removing part or the shaft shoulder can be replaced respectively when being worn, and the cost is saved.

In one possible embodiment, the flash removal portion is screwed to the shoulder for adjusting the relative position of the flash removal portion on the shoulder.

The flash removing part is in threaded connection with the shaft shoulder, and the connecting position of the flash removing part and the shaft shoulder can be adjusted to adapt to different welding conditions, so that the flash removing part can more accurately remove flash and burrs.

A second aspect of the present application provides a method of welding with a welding tool including a friction stir portion and a center moving portion, characterized by comprising the steps of:

pressing the friction stir part down to the surface of the workpiece, rotating the friction stir part to a preset depth, and performing friction stir on the workpiece;

the central moving part moves towards the direction opposite to the pressing direction of the stirring friction part, so that the workpiece material generated by the friction stirring of the workpiece enters the cavity of the through hole between the central moving part and the stirring friction part;

moving the welding tool along the welding direction to form a welding seam, and stopping moving at the tail part of the welding seam;

the stirring friction part moves towards the direction far away from the workpiece, and meanwhile, the central moving part presses downwards towards the workpiece, so that the workpiece material in the cavity is extruded out and pressed into the keyhole at the tail part of the welding seam.

In one possible design, the method of welding with a welding tool further comprises the steps of:

a flash removing part is arranged on the periphery of the stirring friction part;

the burr removing part is rotated with the friction stir part to remove burrs generated when the friction stir part stirs the workpiece.

A third aspect of the present application provides a battery comprising a case and an end cap, the end cap and the case being welded or welded-connected by the welding method as described above using the welding tool for welding a workpiece as described above.

A fourth aspect of the present application provides an electric device including the battery described above.

According to the welding tool and the welding method for the welding workpiece, the central moving part is arranged in the through hole of the friction stir part, thermoplastic workpiece materials are absorbed and extruded through the up-and-down movement of the central moving part in the welding process, so that the key hole at the tail part of the welding seam is automatically filled in the welding process, manual repair welding is not needed, and the production efficiency is improved.

And moreover, a flash removing part is arranged outside the stirring friction part, and flash burrs generated around the welding seam are automatically removed in the welding process to form a smooth and flat welding seam.

The battery manufactured by the welding tool and the welding method has smooth and flat welding seams, can prevent metal scraps from influencing the battery core in the welding process, and is high in production efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only specific embodiments of the present application, and those skilled in the art can obtain other embodiments from the following drawings without inventive effort.

FIG. 1 is a schematic illustration of a vehicle configuration according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a cell according to an embodiment of the present disclosure;

fig. 3 is an exploded view of the battery cell of fig. 2;

FIG. 4 is a schematic diagram of a bonding tool according to an embodiment of the present application;

FIG. 5 is an exploded view of the bonding tool of FIG. 4;

FIG. 6 is a cross-sectional view of a bonding tool of one embodiment of the present application taken along the line B-B in FIG. 4;

FIG. 7 is a schematic illustration of the bonding tool of FIG. 6 coupled to a power source;

FIG. 8 is a sectional view taken along line A-A of FIG. 6;

FIG. 9 is a schematic view of a bonding tool of one embodiment of the present application reaching a work piece surface;

FIG. 10 is a schematic illustration of the bonding tool of FIG. 9 beginning friction stir welding;

FIG. 11 is a schematic view of the bonding tool of FIG. 10 pressed down to a predetermined location on a workpiece;

FIG. 12 is a schematic view of the welding tool of FIG. 11 rotated up the trailing portion of the weld;

FIG. 13 is a schematic view of the welding tool of FIG. 12 pressing a workpiece material into a central keyhole at the tail of a weld;

FIG. 14 is a flow chart of a method of welding with a welding tool in accordance with an exemplary embodiment of the present application.

Reference numerals:

E. a vehicle;

F. a battery cell;

C. a controller;

m, a motor;

D. a battery;

100. an electrode assembly;

101. a main body portion;

102. a tab;

200. a housing;

201. an opening;

300. an end cap assembly;

31. an electrode terminal;

32. an end cap;

33. an insulating member;

34. a collector plate;

1. a welding tool;

11. a friction stir section;

111. a through hole;

112. a shaft shoulder;

113. a stirring pin;

114. a second thread;

115. a first thread;

116. mounting holes;

12. a center moving section;

13. a flash removal unit;

131. a cutter part;

132. a connecting portion;

133. a third thread;

134. a fastener mounting hole;

135. cutting off the surface;

14. a first power source;

141. a first motor;

142. a second motor;

15. a second power source;

151. a third motor;

152. a fourth motor;

2. a workpiece;

21. a workpiece material;

x, the axial direction of the electrode assembly;

y, central axis.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the following examples are only some of the examples of the present application. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present application, based on the following examples.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B 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.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The applicant has noticed that when friction stir welding is performed on a workpiece, a central keyhole is formed at the end of the weld when the welding tool moves to the end of the weld in the welding direction, and after the friction stir welding is completed, the central keyhole needs to be subjected to repair welding. Because the production rhythm of the power battery production line is fast, the repair welding process is added, and during the friction stir welding, the keyhole generated at the tail part of the welding line is filled, so that the production efficiency is seriously influenced, and the cost is increased.

In addition, in the friction stir welding process, a part of the workpiece material overflows to the outside of the weld joint under the high-speed rotation and upsetting action of the welding tool, and flash burrs are formed at the edge of the weld joint. The flash burr affects the appearance of the weld and the structural size of the workpiece, and is polished to remove the flash burr after welding, and metal debris generated in the polishing process after welding seriously threatens the safety of the electrode assembly of the battery, so that the flash burr is required to be eliminated in the friction stir welding process.

Based on the above problems discovered by the applicant, the applicant has developed a friction stir welding tool, and further describes embodiments of the present application below.

The embodiment of the application provides a battery D and a device using the battery D as a power supply.

The device using the battery D as a power source includes a vehicle E, a ship, a small airplane, and the like, and the device uses the battery D to supply electric energy to generate a driving force for driving the device. The device may also use electrical energy in combination with other types of energy sources (e.g., fossil energy) to generate driving force. Any device capable of using battery D as a power source is within the scope of the present application.

Fig. 1 is a schematic structural diagram of a vehicle E according to an embodiment of the present application.

As shown in fig. 1, taking a vehicle E as an example, the vehicle E in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. For example, the vehicle E includes a motor M, a controller C, and a battery D. The battery D is horizontally disposed at the bottom of the vehicle body, and may be disposed at another portion of the vehicle E depending on the specific configuration of the vehicle E. The controller C controls the battery D to supply power to the motor M, and the motor M is connected with wheels on the vehicle main body through a transmission mechanism so as to drive the vehicle E to move.

In order to meet different power requirements, the battery D may include a plurality of battery cells F, wherein the plurality of battery cells F may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. Battery D may also be referred to as a battery pack. Alternatively, a plurality of battery cells F may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery D. That is, the plurality of battery cells F may directly constitute the battery D, or may be first constituted into the battery module and then constituted into the battery D.

The battery cell F is generally divided into a cylindrical battery cell, a square battery cell and a soft package battery cell, and in the following examples, the cylindrical battery cell is taken as an example to describe the present application in detail.

FIG. 2 is a schematic diagram of a cell F according to an embodiment of the present disclosure; fig. 3 is an exploded view of the battery cell F of fig. 2.

As shown in fig. 2, the battery cell F in the present embodiment is a cylindrical battery cell. The cylindrical battery monomer means that the battery monomer F is of a cylindrical structure in appearance.

As shown in fig. 3, the battery cell F of the present embodiment is a secondary battery including a case 200 and an electrode assembly 100 disposed in the case 200. The housing 200 of the present embodiment has a cylindrical structure. The case 200 is provided with openings 201 at both side ends in the electrode assembly axis direction X, and has a receiving space therein for receiving the electrode assembly 100 and the electrolyte. The housing 200 may be made of a material such as aluminum, aluminum alloy, or plastic. The electrode assembly 100 includes a body portion 101 and tabs 102 located at both side ends of the body portion 101 in the electrode assembly axis direction X. The electrode assembly 100 may be loaded into the receiving space in the case 200 from the opening 201 at the end of the case 200.

As shown in fig. 3, the battery cell F further includes an end cap assembly 300. The cap assembly 300 is used to close the openings 201 at both sides of the housing 200. The end cap assembly 300 includes an end cap 32, an insulator 33, an electrode terminal 31, and a current collecting plate 34. The cap 32 covers the opening 201 of the housing 200 and is attached to the housing 200, for example, the cap 32 may be welded to the housing 200. The insulator 33 and the electrode terminal 31 are provided on the end cap 32. The insulating member 33 is disposed on a side of the end cap 32 near the inside of the housing 200. The electrode terminal 31 is electrically connected to the electrode assembly 100 through a current collecting plate 34, and the current collecting plate 34 is fixedly mounted on the end cap assembly 300 at a side facing the tab 102. Illustratively, the housing 200 has two opposing openings 201. The number of the end cap assemblies 300 is two. The two end caps 32 cover the two openings 201, respectively, and are connected to the housing 200. One end cap assembly 300 is provided for each of both ends of the electrode assembly 100 in the electrode assembly axis direction X. When the battery monomer F is assembled, the electrode assembly 100 is placed in the casing 200, the tabs 102 on the two sides are respectively welded to the current collecting plates 34 of the end cover assemblies 300 on the two sides, and then the end covers 32 on the two sides are respectively welded to the casing 200, so that the assembly of the battery monomer F is completed.

In a specific embodiment, friction stir welding is adopted for welding the workpieces such as the shell 200, the end cap 32 and the like in the battery D, friction stir welding is performed on the workpieces through the friction stir welding tool 1, so that the workpiece materials are in a thermoplastic state, the workpiece materials in the thermoplastic state are solidified under the stirring and extruding effects, the workpieces are connected together, solid-phase connection of the workpieces is realized, and therefore assembly of the battery D is completed.

The welding tool 1 according to an embodiment of the present invention performs friction stirring on a workpiece 2 (see fig. 9) to complete welding. The workpiece 2 is a member that can be welded by the friction stir welding tool 1, and the battery D may be a member such as the case 200 or the end cap 32, or may be another member that can be applied to friction stir welding, and the material of the workpiece 2 may be a material that can generate plastic flow by friction heating, such as an aluminum magnesium alloy or a steel titanium alloy, and the specific structure and material of the workpiece 2 are not limited in the present application.

Fig. 4 is a schematic structural diagram of a bonding tool 1 according to an embodiment of the present application.

As shown in fig. 4, the welding tool 1 for welding the workpiece 2 includes a friction stir welding portion 11 and a center moving portion 12, the friction stir welding portion 11 is provided with a through hole 111 (see fig. 5) along a central axis Y, and the center moving portion 12 is disposed in the through hole 111 and is in clearance fit with the friction stir welding portion 11 so that the center moving portion 12 and the friction stir welding portion 11 can make relative movement.

Specifically, the center moving part 12 is movable up and down in the center axis Y direction with respect to the friction stir part 11, and the friction stir part 11 is also movable up and down in the center axis Y direction with respect to the center moving part 12. The center moving portion 12 is rotatable about the center axis Y with respect to the friction stir welding portion 11, and the friction stir welding portion 11 is also rotatable about the center axis Y with respect to the center moving portion 12.

As shown in fig. 4, a flash removing portion 13 for removing flash generated during the welding process may be further provided on the outer periphery of the friction stir welding portion 11.

When the welding tool 1 welds the workpiece 2, the center moving portion 12 and the friction stir portion 11 move to the welding position of the workpiece 2, respectively, and the friction stir portion 11 rotates around the central axis Y to friction stir the workpiece 2, thereby causing plastic flow of the workpiece material of the workpiece 2. The center moving part 12 rotates left and right and moves up and down with respect to the friction stir part 11, thereby forming a cavity in the through-hole 111 of the friction stir part 11, and allowing the workpiece material that generates plastic flow to enter the cavity.

When the welding tool 1 moves forward along the welding direction, a part of workpiece materials overflow to the outside of the welding seam, and flash burrs are formed on the edges of two sides of the welding seam, at the moment, the flash removing part 13 rotates together with the friction stir part 11 to cut off the flash burrs, so that a smooth and flat welding seam is formed.

When the welding tool 1 moves to the tail part of the welding seam, the welding tool 1 stops moving forwards, the friction stir part 11 rotates and rises along the Y direction of the central axis and moves towards the direction far away from the workpiece 2, meanwhile, the central moving part 12 rotates and presses downwards towards the workpiece 2 to extrude workpiece materials in the cavity into a central key hole at the tail part of the welding seam, so that the backfilling of the central key hole of the welding seam is completed, after the welding is completed, manual repair welding is not needed, the welding process is reduced, and the welding efficiency is improved.

Fig. 5 is an exploded view of the bonding tool 1 in fig. 4.

As shown in FIG. 5, in one embodiment, the friction stir segment 11 includes a shoulder 112 and a pin 113, the pin 113 being removably attached to the shoulder 112 in a coaxial arrangement. Specifically, the lower end of the shoulder 112 in the direction of the center axis Y is provided with a mounting hole 116 (see fig. 6), and the probe 113 is mounted in the mounting hole 116, and the diameter of the mounting hole 116 matches the outer diameter of the probe 113.

The pin 113 is coaxially fitted with the shoulder 112, and the through hole 111 penetrates the pin 113 and the shoulder 112 in the direction of the central axis Y, so that the center moving part 12 is simultaneously clearance-fitted with the pin 113 and the shoulder 112.

Fig. 6 is a cross-sectional view of the bonding tool 1 according to an embodiment of the present application, taken along the direction B-B in fig. 4.

As shown in fig. 6, in one embodiment, the mounting hole 116 is a threaded hole, the outer peripheral surface of the pin 113 is provided with a first thread 115 matching with the threaded hole, the pin 113 is screwed into the mounting hole 116 at the lower end of the shoulder 112, the shoulder 112 moves to drive the pin 113 to move together, and the pin 113 moves in the same direction as the shoulder 112 during welding using the welding tool 1.

The friction stir welding tool 1 is required to be wear-resistant, have good toughness, and have high material and processing costs for the stirring pin 113. In the friction stir welding part 11 in the prior art, the friction stir welding part 11 needs to be integrally replaced after the friction stir welding part 113 is worn, so that the cost is high, and when the friction stir welding part 11 is integrally replaced, the welding tool 1 needs to be integrally disassembled, and after the parts are replaced, the parts are integrally reinstalled, so that the replacement steps are complicated, and the efficiency is low. In this embodiment, the pin 113 and the shoulder 112 are designed separately, and after the pin 113 is worn, only a new pin 113 needs to be replaced, and the whole welding tool 1 does not need to be disassembled and assembled.

In addition, the stirring pin 113 and the shaft shoulder 112 are in threaded connection, the connection length of the stirring pin 113 and the shaft shoulder 112 can be adjusted, so that the depth of the stirring pin 113 penetrating into a workpiece can be adjusted, different welding conditions can be adapted, the thinning amount of a welding seam can be adjusted, and the defect of a tunnel inside the welding seam is avoided.

Fig. 7 is a schematic view of the bonding tool 1 of fig. 6 connected to a power source.

In one embodiment, the shoulder 112 is connected to the first power source 14, and the shoulder 112 drives the pin 113 to move up and down and/or rotate left and right under the driving of the first power source 14.

In one particular embodiment, the first power source 14 includes a first motor 141 and a second motor 142. The first motor 141 drives the shoulder 112 to rotate, and the second motor 142 drives the shoulder 112 to move up and down.

The shoulder 112 is driven by the first power source 14 to independently move up and down and rotate left and right, thereby enabling the shoulder 112 to friction stir the workpiece 2 as required by the welding process.

Further, the center moving part 12 is connected to a second power source 15, and the center moving part 12 moves up and down and/or rotates left and right with respect to the shoulder 112 by the driving of the second power source 15.

In one embodiment, the second power source 15 includes a third motor 151 and a fourth motor 152. the third motor 151 drives the center moving part 12 to move up and down, and the fourth motor 152 drives the center moving part 12 to rotate.

The first power source 14 and the second power source 15 are respectively provided with independent motors, and the shaft shoulder 112 and the central moving part 12 can realize independent up-and-down movement and left-and-right rotation under the driving of the first power source 14 and the second power source 15. In the welding process, the shaft shoulder 112 and the central moving part 12 are respectively controlled according to the requirements of the welding process, so that the suction of workpiece materials and the backfill of a keyhole at the tail part of a welding seam are realized.

In the friction stir welding process, due to the high-speed rotation and the upsetting pressing of the stirring pin 113, after the workpiece material in the welding area generates thermoplastic flow, a part of the workpiece material overflows to the outside of the weld joint, flash burrs are formed at the edges of two sides of the weld joint, the appearance and the structural installation accuracy of the weld joint are affected by the flash burrs, and after the welding is completed, the flash burrs need to be polished and removed. On the other hand, the manufacturing process of the power battery must be strictly controlled in precision and production safety, and in order to prevent metal scraps generated in the process of grinding and removing burrs from causing serious threats to the safety of the battery, the burrs generated in the process of friction stir welding need to be eliminated in the welding process.

Fig. 8 is a sectional view taken along a-a in fig. 6.

As shown in fig. 5 to 8, in an embodiment, the welding tool 1 further includes a flash removing portion 13 disposed at an outer periphery of the shaft shoulder 112, the flash removing portion 13 is fixedly connected to the shaft shoulder 112, and the flash removing portion 13 can remove flash burrs generated during the welding process.

Specifically, the flash removing portion 13 includes a connecting portion 132 and a cutter portion 131, the connecting portion 132 is fixedly connected to the shoulder 112, and the cutter portion 131 is disposed on the connecting portion 132. In the welding process, the shaft shoulder 112 drives the stirring pin 113 to rotate at a high speed and press down towards the workpiece 2 to weld the workpiece 2, meanwhile, the connecting part 132 is driven to rotate together and press down, and the cutter arranged on the connecting part 132 rotates at a high speed along with the shaft shoulder 112 to cut off flash burrs formed at the periphery of a welding seam.

In one embodiment, the flash removing part 13 and the shaft shoulder 112 are fastened to the shaft shoulder 112 through fasteners, so that the flash removing part 13 and the shaft shoulder 112 can be detachably connected, and can be replaced when the flash removing part 13 or the shaft shoulder 112 is worn, and the cost is saved.

In one embodiment, the connecting portion 132 is an annular structure mounted on the outer periphery of the shoulder 112, and when the flash removing portion 13 is assembled, the shoulder 112 is sleeved into the annular structure of the connecting portion 132, and then the connecting portion 132 and the shoulder 112 are fixedly connected by a fastener.

As shown in fig. 8, fastener mounting holes 134 are uniformly distributed on the annular structure of the connecting portion 132, and the fasteners connect and fix the flash removing portion 13 and the shaft shoulder 112 through the fastener mounting holes 134. The fastener mounting hole 134 may be provided with a thread, and the fastener may be a corresponding bolt, screw, or the like, and the bolt is screwed into the fastener mounting hole 134 to fasten the flash removing portion 13 and the shoulder 112. The flash removing part 13 is fastened to the outer circumferential surface of the shaft shoulder 112 by using fasteners such as bolts, screws and the like, and the flash removing part is simple to operate, convenient to replace and easy to operate.

In one embodiment, a plurality of cutter portions 131 are uniformly disposed on the outer circumferential surface of the connecting portion 132. In this embodiment, three cutter portions 131 are provided. The plurality of cutter portions 131 extend outward from the outer circumferential surface of the connecting portion 132 to form a cut-away surface 135. When the burr removing portion 13 rotates at a high speed along with the shoulder 112, the cutting surface 135 removes burrs formed around the weld bead.

In one embodiment, the flash removing portion 13 is threadedly coupled to the shoulder 112 for adjusting the relative position of the flash removing portion 13 on the shoulder 112.

As shown in fig. 5 and 6, a second screw 114 is provided on the outer circumferential surface of the shoulder 112, and a third screw 133 is provided inside the annular structure of the connecting portion 132. The shoulder 112 is screwed into the connecting portion 132, the second thread 114 and the third thread 133 are engaged, the burr removing portion 13 is connected to the shoulder 112, and the fixing position of the burr removing portion 13 on the shoulder 112 is adjusted by rotating the burr removing portion 13.

The flash removing part 13 is connected with the shaft shoulder 112 through threads, and the connecting position of the flash removing part 13 and the shaft shoulder 112 can be adjusted to adapt to different welding conditions, so that the flash removing part 13 can remove flash burrs more accurately.

In an embodiment, the lower end surface of the flash removing portion 13 in the direction of the central axis Y is 0.1 millimeter (mm) to 0.2 millimeter (mm) higher than the lower end surface of the shoulder 112, so as to ensure the flash removing effect of the flash removing portion 13, and the workpiece 2 and the weld joint are not worn in the removing process.

The process of welding the workpiece 2 using the welding tool 1 is specifically described below. Fig. 9 to 13 are schematic diagrams illustrating a welding process of the welding tool 1 to the workpiece 2 according to an embodiment of the present application.

Fig. 9 is a schematic view of the welding tool 1 according to an embodiment of the present application reaching the surface of the workpiece 2.

As shown in fig. 9, when welding the workpiece 2, the first power source 14 and the second power source 15 drive the shoulder 112 and the central moving portion 12 to the welding position of the workpiece 2, respectively, and start friction stirring the workpiece 2.

Fig. 10 is a schematic view of the welding tool 1 in fig. 9 starting friction stirring.

In order to allow the thermoplastic workpiece material 21 generated by friction stirring to enter the cavity formed by the central moving portion 12 and the through hole 111, the central moving portion 12 and the stirring pin 113 may be caused to simultaneously reach the surface of the workpiece 2 with the lower end surfaces of the central moving portion 12 and the stirring pin 113 being flush.

As shown in fig. 10, when the center moving portion 12 and the probe 113 reach the surface of the workpiece 2 at the same time, and the probe 113 is rotated and pressed down at a high speed toward the inside of the workpiece 2, the workpiece 21 in which the workpiece 2 is thermoplastically fluidized at the welding position is generated by the friction stir action of the probe 113, and the center moving portion 12 is rotated and raised in a direction away from the workpiece 2, so that a cavity is formed in the through hole 111 of the friction stir portion 11, and the workpiece 21 in which the thermoplastically fluidized enters the cavity of the through hole 111 as the center moving portion 12 is raised.

The center moving portion 12 and the probe 113 reach the surface of the workpiece 2 at the same time, and when the probe 113 starts friction stirring the workpiece 2 and the workpiece material 21 enters the cavity formed by the center moving portion 12 and the through hole 111, air does not remain in the cavity.

Fig. 11 is a schematic view of the bonding tool 1 in fig. 10 pressed down to a predetermined position of the work 2.

As shown in fig. 11, the first power source 14 drives the shoulder 112 to rotate the stirring pin 113 to a predetermined depth inside the workpiece 2, the central moving portion 12 is driven by the second power source 15 to move upward to a predetermined position along the central axis Y, so that a part of the workpiece material 21 generated by friction stirring the workpiece 2 enters the cavity of the through hole 111 between the central moving portion 12 and the stirring friction portion 11, and the welding tool 1 advances in the welding direction to form a weld on the surface of the workpiece 2.

When the welding tool 1 moves forward along the welding direction, a small part of workpiece materials 21 overflow to the outside of the welding seam, and flash burrs are formed on the edges of two sides of the welding seam.

Fig. 12 is a schematic view of the welding tool 1 of fig. 11 rotating up at the end of the weld bead.

As shown in fig. 12, when the welding tool 1 moves to a predetermined position of the workpiece 2, the welding tool 1 stops moving forward, the friction stir zone 11 rotationally rises in the direction of the central axis Y under the drive of the first power source, the central moving zone 12 rotationally falls toward the workpiece 2 under the drive of the second power source, and the central moving zone 12 pushes out and presses the workpiece material 21 in the cavity into the keyhole at the end of the weld by moving downward, thereby completing the filling of the keyhole at the end of the weld.

Fig. 13 is a schematic view of the bonding tool 1 of fig. 12 pressing the workpiece material 21 into the central keyhole at the tail of the weld.

As shown in fig. 13, the friction stir zone 11 is raised to the surface of the workpiece 2, the central moving zone 12 is lowered to the surface of the workpiece 2, the workpiece material 21 in the through hole 111 is completely extruded, and the welding is completed to form a flat weld bead with no flash on the surface and no keyhole on the tail.

The present application also provides a method of welding with the welding tool 1.

As shown in fig. 14, the present application provides a method of welding using a welding tool 1, the welding tool 1 including a friction stir portion 11 and a center moving portion 12, the friction stir portion 11 including a shoulder 112 and a pin 113.

The welding method comprises the following steps:

in step S1, the friction stir zone 11 is pressed down to the surface of the workpiece 2, and the friction stir zone 11 is rotated to a predetermined depth to perform friction stir processing on the workpiece 2.

Specifically, the center moving portion 12 and the probe 113 may be caused to reach the surface of the workpiece 2 at the same time, with the lower end faces of the center moving portion 12 and the probe 113 being flush.

In step S2, the center moving part 12 is moved in the direction opposite to the direction in which the friction stir welding part 11 is pressed down, and the workpiece material 21 generated by friction stirring the workpiece 2 is inserted into the cavity of the through hole 111 between the center moving part 12 and the friction stir welding part 11.

Step S3 is to move the welding tool 1 in the welding direction to form a weld bead and to stop the movement at the end of the weld bead.

In step S4, the friction stir zone 11 is moved in a direction away from the workpiece 2, and the center moving zone 11 is pressed down in the direction of the workpiece 2, thereby pushing out the workpiece material 21 in the cavity and pressing it into the keyhole at the end of the weld.

In a particular embodiment, the method of welding with the welding tool 1 further comprises the steps of:

the burr removal portion 13 is provided on the outer periphery of the friction stir zone 11.

The burr removing portion 13 is rotated with the friction stir portion 11 to remove burrs generated when the friction stir portion 11 stirs the workpiece 2.

When the welding tool 1 moves forward along the welding direction, a part of the workpiece material 21 overflows to the outside of the weld joint, and burrs are formed on the edges of the two sides of the weld joint, at this time, the burr removing part 13 on the outer circumference of the shaft shoulder 112 synchronously rotates along with the shaft shoulder 112, and the protruding cutter part 131 cuts off the burrs and the burrs to form a smooth and flat weld joint.

And after the welding is finished, forming a flat welding line without flash on the surface and keyhole at the tail part.

According to the welding tool 1 and the welding method for the welding workpiece 2, the central moving part 12 is arranged in the through hole 111 of the stirring friction part 11, and the thermoplastic workpiece material 21 is absorbed and extruded through the up-and-down movement of the central moving part 12 in the welding process, so that the central keyhole at the tail part of a welding seam is automatically filled in the welding process, manual repair welding is not needed, and the production efficiency is improved.

In addition, a flash removing part 13 is provided outside the friction stir part 11, and flash burrs generated around the weld bead are automatically removed during the welding process, so that a smooth and flat weld bead is formed.

Battery D through the manufacturing of welding tool and welding method of this application has smooth level and smooth welding seam to can prevent that metal debris from to electric core production influence in welding process, production efficiency is high.

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

Claims

1. A bonding tool for bonding workpieces, comprising:

the friction stir part is used for performing friction stir on the workpiece to enable the workpiece material of the workpiece to generate plastic flow, and the friction stir part is provided with a through hole which penetrates along the axis direction; and

the central moving part is arranged in the through hole and is in clearance fit with the friction stir part; the friction stir part can move up and down and/or rotate left and right relative to the central moving part along the direction of a central axis, and the central moving part can move up and down and/or rotate left and right relative to the friction stir part along the direction of the central axis, so that the workpiece material which generates plastic flow enters the through hole, or the workpiece material entering the through hole is extruded.

2. The welding tool for welding workpieces of claim 1, wherein said friction stir segment includes a shoulder and a pin, said pin being coaxially mounted and removably connected to said shoulder; the shaft shoulder drives the stirring needles to move together when moving, and the moving direction of the stirring needles is consistent with that of the shaft shoulder.

3. The welding tool for welding workpieces of claim 2, wherein the shoulder is connected to a first power source, and the shoulder drives the stirring pin to move up and down and/or rotate left and right under the driving of the first power source.

4. The welding tool for welding workpieces according to claim 3, wherein the center moving part is connected to a second power source, and the center moving part moves up and down and/or rotates left and right relative to the shoulder under the drive of the second power source.

5. The welding tool for welding workpieces according to claim 4, wherein the center moving portion and the stirring pin simultaneously reach the workpiece surface when welding workpieces.

6. The welding tool for welding workpieces of claim 5, wherein said pin is rotated to a predetermined depth inside said workpieces, said welding tool being advanced in a welding direction to form a weld; the central moving part is driven by the second power source to move upwards along the direction of the central axis, so that part of workpiece materials generated by friction stirring of the workpiece enter a cavity of the through hole between the central moving part and the friction stirring part.

7. The welding tool for welding workpieces of claim 6, wherein when the welding tool is moved to a predetermined position on the workpiece, the central moving portion pushes the workpiece material in the cavity out of and into a keyhole at the end of the weld by moving downward.

8. The welding tool for welding workpieces according to any one of claims 2 to 7, further comprising a flash removal portion provided at an outer periphery of the shoulder.

9. The welding tool for welding workpieces of claim 8, wherein the flash removing portion is fixedly connected to the shoulder, and the flash removing portion is fastened to the shoulder by a fastener during welding.

10. The welding tool for welding workpieces of claim 9, wherein the flash removal portion is threadably connected to the shoulder for adjusting the relative position of the flash removal portion on the shoulder.

11. A method of welding with a welding tool comprising a friction stir section and a central moving section, the method comprising the steps of:

pressing the friction stir part down to the surface of the workpiece, rotating the friction stir part to the preset depth of the workpiece, and performing friction stir on the workpiece;

moving a central moving part in a direction opposite to the direction in which the friction stir part is pressed down, so that a workpiece material generated by friction stirring the workpiece enters a cavity of the through hole between the central moving part and the friction stir part;

and moving the stirring friction part to the direction far away from the workpiece, and simultaneously pressing the central moving part to the workpiece direction to extrude the workpiece material in the cavity and press the workpiece material into the keyhole at the tail part of the welding seam.

12. The method of welding with a welding tool as defined in claim 11, further comprising the steps of:

and enabling the flash removing part to rotate along with the stirring friction part to remove the flash generated when the stirring friction part stirs the workpiece.

13. A battery comprising a plurality of battery cells, the battery cells comprising a housing and an end cap assembly,

the end cap assembly and the housing are welded using a welding tool for welding workpieces as defined in claims 1-10 or welded according to the method of welding using a welding tool as defined in claim 11 or 12.

14. An electric device comprising the battery according to claim 13.