WO2021098890A1

WO2021098890A1 - Tab soldering apparatus and tab soldering method

Info

Publication number: WO2021098890A1
Application number: PCT/CN2021/071680
Authority: WO
Inventors: 冯俊敏; 张万财; 吴婷婷
Original assignee: 深圳市海瀚新能源技术有限公司
Priority date: 2019-11-21
Filing date: 2021-01-14
Publication date: 2021-05-27

Abstract

A tab soldering apparatus (20) and a tab soldering method. The tab soldering apparatus (20) comprises: a first foil material delivery mechanism (21) used for delivering a first foil material (14); a current collector delivery mechanism (22) used for delivering a composite current collector (10); a second foil material delivery mechanism (23) used for delivering a second foil material (15); and a soldering device (24). The soldering device (24) is configured to simultaneously clamp the first foil material (14) and the second foil material (15), such that the composite current collector (10) is clamped between the first foil material (14) and the second foil material (15) in a manner to allow the first foil material (14) and the second foil material (15) to be soldered separately onto two opposite surfaces of the composite current collector (10). Also provided is a winding mechanism (25) used for winding the composite current collector (10) of which the two opposite surfaces are separately soldered with the first foil material (14) and the second foil material (15).

Description

Tab welding device and tab welding method

Cross-references to related applications

This application requires the application number to be submitted to the Chinese Patent Office on November 21, 2019. The application number is 201911151901.X, the name is "a kind of lug welding device and the method of lug welding", the application number is 201922048313.5, and the name is "a kind of lug The priority of the Chinese patent application for "welding device", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of processing secondary batteries, and in particular to a tab welding device and a tab welding method.

Background technique

The structure of the composite current collector used in the existing secondary battery usually includes: a polymer layer in the middle and a metal plating layer on both surfaces of the polymer layer. In order to collect the current of the metal plating layer on both surfaces, it is usually required on both surfaces. Connect the lugs.

The existing method of connecting the tabs is usually: welding the first foil to the first metal layer of the composite current collector by one welding, and then welding the second foil to the second metal layer of the composite current collector through secondary welding. , The welding method is more complicated and the welding efficiency is not high.

Summary of the invention

The purpose of this application includes providing a lug welding device and a lug welding method. Through one-time welding, the first foil and the second foil are respectively welded on two opposite surfaces of the composite current collector to improve welding. effectiveness.

In order to achieve at least one of the above objectives of this application, the following technical methods can be adopted in this application:

In the first aspect, an embodiment of the present application provides a tab welding device, including: a first foil conveying mechanism for conveying the first foil. The current collector conveying mechanism is used to convey the composite current collector. The second foil conveying mechanism is used to convey the second foil. The welding equipment is configured to sandwich the first foil and the second foil at the same time, so as to sandwich the composite current collector between the first foil and the second foil and simultaneously separate the first foil and the second foil. Welded on the two opposite surfaces of the composite current collector. And the winding mechanism is used for winding the composite current collector with the first foil material and the second foil material welded on two opposite surfaces respectively.

The first foil is conveyed through the first foil conveying mechanism, the composite current collector is conveyed by the current collector conveying mechanism, the second foil is conveyed by the second foil conveying mechanism, and the three are conveyed to the welding equipment at the same time. The foil is welded to the first surface of the composite current collector, and the second foil is welded to the second surface of the composite current collector (the first surface and the second surface are two opposite surfaces of the composite current collector, that is, the second surface of the composite current collector). A metal layer and a second metal layer), the first foil and the second foil can be welded to the two surfaces of the composite current collector at the same time by one welding device, thereby improving the welding efficiency.

In a possible embodiment, it further includes an overlapping mechanism. The overlapping mechanism includes a first passing roller. The first passing roller is located at the rear end of the first foil conveying mechanism, the current collector conveying mechanism, and the second foil conveying mechanism. An over roll is used to pull the overlapped first foil, composite current collector and second foil, and at least a part of the overlapping part is a three-overlap structure, and the first over roll is located at the front end of the welding equipment.

Before welding, the first foil, composite current collector and second foil are guided by the first passing roller, so that the first foil, composite current collector and second foil can be brought together before the welding equipment And carry out a certain traction, the composite current collector is sandwiched between the first foil and the second foil, and the first foil and the second foil can be attached to the two opposite surfaces of the composite current collector at a time. Corresponding to the first foil and the second foil, and then enter the welding head and the welding seat of the welding equipment for welding, which can make the welding effect better, and more accurately, the first foil and the second foil at the same time. The foils are respectively welded on two opposite surfaces of the composite current collector.

In a possible implementation, the overlapping mechanism further includes a second passing roller, the second passing roller is located at the front end of the first passing roller, and the second passing roller is located at the first foil conveying mechanism, the current collector conveying mechanism and the second passing roller. At the rear end of the foil conveying mechanism, the second passing roller is used to overlap the first foil, the composite current collector and the second foil.

The first foil, the composite current collector and the second foil are compounded and overlapped on the second passing roller, and then pulled by the first passing roller, so that the first foil, the composite current collector and the second foil can be welded The previous layer structure is tightly attached to facilitate subsequent welding.

In a possible implementation, the overlapping mechanism further includes a third passing roller, the third passing roller is located at the front end of the second passing roller, and the third passing roller is located at the first foil conveying mechanism, the current collector conveying mechanism and the second passing roller. At the rear end of the foil conveying mechanism, the third passing roller is used to overlap the first foil and the composite current collector, and the second passing roller is used to overlap the second foil and the overlapped first foil and the composite current collector.

The first foil material and the composite current collector are compositely overlapped through the third passing roller, and then the second foil material is also compositely overlapped on the second passing roller, so that the overlapping effect of the three is better.

In a possible embodiment, the winding mechanism includes a rolling mechanism, the rolling mechanism is located at the rear end of the welding device, and the rolling mechanism is used for welding the first foil, the composite current collector, and the second foil. Perform synchronous rolling.

Since the first foil material and the second foil material are respectively welded to the two opposite surfaces of the composite current collector, after the welding is completed, the welding mark is thicker. Through the rolling and shaping of the rolling mechanism, the thickness of the welding mark can be reduced. The welding mark is more balanced, and the probability of deviation of the composite current collector after welding is reduced during the conveying process.

In a possible implementation, the rolling mechanism includes a steel pressing roller and an active roller, the steel pressing roller and the active roller are used to sandwich the welded composite current collector and roll the weld mark on the composite current collector. The welding mark of the composite current collector after welding can be made smoother.

In a possible implementation, the winding mechanism further includes a driving mechanism, the driving mechanism is located at the rear end of the rolling mechanism, and the driving mechanism is used to provide power for transporting the rolled composite current collector to the rear end. It can facilitate the winding of the rolled composite current collector.

In a possible implementation, the first foil conveying mechanism includes a first correction mechanism for correcting the first foil being conveyed, and the current collector conveying mechanism includes a second correction mechanism for correcting the conveying The composite current collector is used for rectification, the second foil conveying mechanism includes a third rectifying mechanism for rectifying the second foil being conveyed, and the first rectifying mechanism, the second rectifying mechanism and the third rectifying mechanism are all located in the welding equipment Front end.

The first foil, composite current collector, and second foil can be corrected during the conveying process, so that the position of the first foil, composite current collector, and second foil relative to the welding head can be adjusted, so that the subsequent accurate The first foil and the second foil are simultaneously welded on two opposite surfaces of the composite current collector, and the weld print size on the composite current collector after welding is controlled.

In a possible implementation manner, the first correction mechanism includes a first correction sensor and a first correction assembly arranged in sequence, and the first correction sensor is located at the rear end of the first correction assembly.

The deviation of the conveying of the first foil material is detected by the first deviation correction sensor, and the signal is transmitted to the first deviation correction component, and the deviation correction is performed by the first deviation correction component.

In the second aspect, an embodiment of the present application provides a method for welding a tab on a composite current collector, which is suitable for the above tab welding device, and the method includes:

The first foil is arranged on the first foil conveying mechanism, the composite current collector is arranged on the current collector conveying mechanism, and the second foil is arranged on the second foil conveying mechanism. The first foil on the first foil conveying mechanism, the composite current collector on the current collector conveying mechanism, and the second foil on the second foil conveying mechanism pass between the welding head and the welding seat of the welding equipment. Control the relative extrusion of the welding head and the welding seat, and simultaneously weld the first foil and the second foil to the two opposite surfaces of the composite current collector, so that the composite current collector is sandwiched between the first foil and the second foil between.

The first foil is welded to the first surface of the composite current collector through the relative extrusion between the welding head and the welding seat, and the second foil is welded to the second surface of the composite current collector (the first surface and the second surface are composite The two opposite surfaces of the current collector, that is, the first metal layer and the second metal layer of the composite current collector), the first foil and the second foil can be welded on both sides of the composite current collector at one time through a welding device. The opposite surface improves welding efficiency.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative work, other relevant drawings can be obtained from these drawings and also belong to the protection scope of this application.

Figure 1 is a schematic diagram of the layer structure of a composite current collector;

Figure 2 is a schematic diagram of the structure of the tab welding device;

Figure 3 is a plan view of the first foil, the composite current collector and the second foil after being transported to the first passing roller;

Fig. 4 is a cross-sectional view taken along the line A-A in Fig. 3.

Icon: 10-composite current collector; 11-insulating layer; 12-first metal layer; 13-second metal layer; 14-first foil; 15-second foil; 20-tab welding device; 21- The first foil conveying mechanism; 22-current collector conveying mechanism; 23-the second foil conveying mechanism; 24-welding equipment; 25-winding mechanism; 26-overlapping mechanism; 211-first foil conveying path; 221- Current collector conveying path; 231-second foil conveying path; 212-first foil unwinding roller; 213-first correcting mechanism; 214-third passing roller; 215-second passing roller; 216-first passing Roller; 222-current collector unwinding roller; 223-second correction mechanism; 232-second foil unwinding roller; 233-third correction mechanism; 2131-first correction sensor; 2132-first correction assembly; 2133 The first correction roller; 2134-the second correction roller; 241-welding head; 242-welding seat; 243-first driving device; 251-rolling mechanism; 252-driving mechanism; 253-winding roller; 2511- Steel pressure roller; 2512-active roller; 2513-second drive device; 2521-main traction roller; 2522-rubber roller.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

FIG. 1 is a schematic diagram of the layer structure of the composite current collector 10. Referring to FIG. 1, the composite current collector 10 has a three-layer structure, including an insulating layer 11 (such as a polymer layer) in the middle and a first metal layer 12 located on both surfaces of the insulating layer 11 (two opposite surfaces of the insulating layer 11). And the second metal layer 13, in order to converge the current on the first metal layer 12 and the second metal layer 13 to the pole, therefore, it is necessary to connect the first tab and the second metal layer on the first metal layer 12. 13 is connected to the second pole ear. The first tab and the second tab are respectively welded on two opposite surfaces (the outer surface of the first metal layer 12 and the outer surface of the second metal layer 13) of the composite current collector 10 by the tab welding device 20. In the welding process, usually, the composite current collector 10 is a long coil with a certain width, the first foil 14 is a long coil with a certain width, and the second foil 15 is also a long coil with a certain width.

In the embodiment of the present application, the composite current collector 10 that needs to weld the first tab and the second tab can be the composite current collector 10 after coating the active material layer; it can also be the composite current collector before coating the active material layer. 10. The embodiments of this application do not make limitations.

2 is a schematic diagram of the structure of the tab welding device 20; FIG. 3 is a plan view of the first foil, the composite current collector and the second foil after being transported to the first passing roller; FIG. 4 is the A-A cross-sectional view of FIG. Please refer to Figures 2 to 4, in the embodiment of the present application, the tab welding device 20 includes a first foil conveying mechanism 21, a current collector conveying mechanism 22, a second foil conveying mechanism 23, a welding device 24, and a winding mechanism 25 And overlapping agencies 26.

Among them, the first foil 14 (first tab) is conveyed along the first foil conveying path 211, and the first foil conveying mechanism 21 can unwind the first foil 14 from the corresponding long coil and follow the first foil. A foil conveying path 211 is conveyed. The composite current collector 10 is conveyed along the current collector conveying path 221, and the current collector conveying mechanism 22 can unwind the composite current collector 10 from the corresponding long coil and convey it along the current collector conveying path 221. The second foil 15 (the second tab) is conveyed along the second foil conveying path 231, and the second foil conveying mechanism 23 can unwind the second foil 15 from the corresponding long roll and follow the second foil. The material conveying path 231 performs conveyance. The composite current collector 10 after welding is conveyed along the winding conveying path, and the composite current collector 10 after welding is conveyed and wound using the winding mechanism 25.

In a preferred embodiment of the present application, the first foil conveying mechanism 21 includes a first foil unwinding roller 212 and a first correction mechanism 213 that are sequentially arranged along the first foil conveying path 211. The current collector conveying mechanism 22 includes a current collector unwinding roller 222 and a second correcting mechanism 223 arranged in sequence along the current collector conveying path 221. The second foil conveying mechanism 23 includes a second foil unwinding roller 232 and a third correcting mechanism 233 arranged in sequence along the second foil conveying path 231. The overlapping mechanism 26 is located at the rear end of the first foil conveying mechanism 21, the current collector conveying mechanism 22 and the second foil conveying mechanism 23, and is located at the front end of the welding equipment 24.

In the preferred embodiment of the present application, the overlapping mechanism 26 includes a third passing roller 214, a second passing roller 215, and a first passing roller 216 arranged in sequence. The third passing roller 214 is located in the first foil conveying mechanism 21 and the current collector conveying mechanism. 22. At the rear end of the second foil conveying mechanism 23, the first passing roller 216 is located at the front end of the welding device 24. The first foil conveying path 211 passes through the third over roller 214, the second over roller 215 and the first over roller 216 in sequence; the current collector conveying path 221 passes through the third over roller 214, the second over roller 215 and the first over roller in sequence 216; The second foil conveying path 231 sequentially passes through the second passing roller 215 and the first passing roller 216. The first foil 14 on the first foil conveying path 211, the composite current collector 10 on the current collector conveying path 221, and the first foil 14 on the first foil conveying path 211 can be coordinated by the third over roller 214, the second over roller 215, and the first over roller 216. After the second foil 15 on the second foil conveying path 231 passes through the first passing roller 216, the first foil 14, the composite current collector 10, and the second foil 15 are gathered and drawn at the first passing roller 216. For subsequent welding.

Please continue to refer to Figures 2 to 4, after the first foil 14, the composite current collector 10 and the second foil 15 are all transported to the first passing roller 216, the first foil 14, the composite current collector 10 and the second The first foil material 15 is located above the composite current collector 10, and the first foil material 14 covers part of the composite current collector 10, and one side in the width direction of the composite current collector 10 is sandwiched between the first foil material 14 and Between the second foils 15 and the width direction side of the composite current collector 10 overlaps with the width direction side of the first foil material 14 and the width direction side of the second foil material 15, the first foil material 14 And the second foil 15 are sandwiched on the same side of the composite current collector 10, the first foil 14 and the second foil 15 are basically completely overlapped, so that the first foil 14, the composite current collector 10 and the second foil 15 At least a part of the overlapping part is a three-fold overlapping structure (that is, the first foil 14, the composite current collector 10, and the second foil 15 overlap sequentially from top to bottom), so that the first foil 14 and the second foil are subsequently overlapped. 15 is welded on two opposite surfaces of the composite current collector 10 at the same time.

The first foil conveying path 211, the current collector conveying path 221 and the second foil conveying path 231 are all independent conveying paths before the third passing roller 214, so that the first foil 14, the composite current collector 10 and the The second foil material 15 is conveyed separately, and the conveying of each coil material can be adjusted individually without interfering with each other. At the third passing roller 214, the first foil 14 on the first foil conveying path 211 and the composite current collector 10 on the current collector conveying path 221 converge and overlap and then pass through the second pass roller 215. The second foil 15 on the second foil conveying path 231 also converges and overlaps at the second passing roller 215, that is to say, the first foil 14, the composite current collector 10 and the second foil 15 pass through the second passing roller 215 together. After the convergence and overlap, it enters the first passing roller 216, overlaps and pulls at the first passing roller 216, and then enters the subsequent welding equipment 24.

It should be noted that in other embodiments, at the third passing roller 214, the second foil 15 on the second foil conveying path 231 and the composite current collector 10 on the current collector conveying path 221 may converge and overlap. After passing through the second passing roller 215 together, at the same time, the first foil 14 on the first foil conveying path 211 also converges and overlaps at the second passing roller 215, that is to say, the first foil 14, the composite current collector 10 and the The second foil 15 passes through the convergence and overlap of the second passing roller 215 and then enters the first passing roller 216, is drawn by the first passing roller 216, and then enters the subsequent welding equipment 24. In some embodiments, the first foil conveying mechanism 21 or the second foil conveying mechanism 23 can be selected for use, so as to increase the application range of the tab welding device. The embodiments of this application do not make limitations.

In order to convey the first foil 14, the composite current collector 10, and the second foil 15 respectively, the first foil conveying mechanism 21 also includes a plurality of passing rollers, a tension mechanism, etc., which can make the first foil conveying path 211 The first foil 14 is under tension during the conveying process, so that the first foil 14 can be conveyed. The current collector conveying mechanism 22 may also include a plurality of passing rollers, a tension mechanism, etc., which can make the composite current collector 10 on the current collector conveying path 221 under tension during the conveying process, so as to convey the composite current collector 10. The second foil conveying mechanism 23 also includes a plurality of passing rollers, a tension mechanism, etc., which can make the second foil 15 on the second foil conveying path 231 under tension during the conveying process, so as to align the second foil 15 Carry out transportation. The embodiments of this application will not be repeated.

Please continue to refer to FIG. 2, further, the first correction mechanism 213, the second correction mechanism 223, and the third correction mechanism 233 transport the first foil 14, the composite current collector 10, and the second foil 15 to the first passing roller 216 After up, they can be overlapped according to the preset relative position (for example, as shown in Figure 4). Next, the first correction mechanism 213, the second correction mechanism 223, and the third correction mechanism 233 will be introduced. The first correction mechanism 213, the second correction mechanism 223 and the third correction mechanism 233 have the same structure and similar functions, except that the correction targets are different. The correction target of the first correction mechanism 213 is the first foil 14, and the first correction mechanism 213 It is used to correct the deviation of the first foil 14 being conveyed. The correction object of the second correction mechanism 223 is the composite current collector 10, and the second correction mechanism 223 is used to correct the composite current collector 10 in transportation. The correction target of the third correction mechanism 233 is the second foil 15, and the third correction mechanism 233 is used for correcting the second foil 15 that is being conveyed. So that when the first foil 14, the composite current collector 10, and the second foil 15 are all transported to the first passing roller 216, the three can be accurately located at the corresponding positions. The structure of the first correction mechanism 213 and the working principle of the first correction mechanism 213 will be described in detail below.

In a preferred embodiment of the present application, the first correction mechanism 213 includes a first correction sensor 2131 and a first correction assembly 2132 arranged in sequence, and the first correction sensor 2131 is located at the rear end of the first correction assembly 2132. In other words, the first foil conveying path 211 passes through the first foil unwinding roller 212, the first correction assembly 2132 and the first correction sensor 2131 in sequence. During the conveying process of the first foil 14, it first passes through the first correction assembly 2132, and then passes through the first correction sensor 2131.

Optionally, the first correcting mechanism 213 further includes a first correcting controller (not shown), and the first correcting component 2132 includes a correcting motor (not shown), a correcting frame (not shown), and a first correcting roller 2133 The output shaft of the correction motor is connected to the correction frame with the second correction roller 2134, the first correction roller 2133 and the second correction roller 2134 are both fixed on the correction frame, and the first correction sensor 2131 is electrically connected to the first correction controller. The first correction controller is electrically connected to the correction motor.

During the conveying process, the first foil material 14 passes through the second correction roller 2134, the first correction roller 2133 and the first correction sensor 2131 in sequence. When the first correction sensor 2131 detects that the first foil 14 is conveyed to the right, it obtains a first signal, and sends the first signal to the first correction controller. After receiving the first signal, the first correction A signal is processed, and the second signal is sent to the correction motor. After the correction motor receives the second signal, it controls the correction frame to shift to the left. The first correction passing roller 2133 and the second correction passing roller 2134 are fixed on the correction frame. Offset to the left to correct the deviation of the first foil 14.

Correspondingly, when the first deviation correction sensor 2131 detects that the conveyance of the first foil 14 is deviated to the left, a third signal is obtained, and the third signal is sent to the first deviation correction controller. After the first deviation correction sensor receives the third signal , The third signal is processed, and the fourth signal is sent to the correction motor. After the correction motor receives the fourth signal, it controls the correction frame to shift to the right, and the first correction pass roller 2133 and the second correction pass are fixed on the correction frame. The roller 2134 is shifted to the right to correct the deviation of the first foil 14. When the first correction controller no longer sends a signal to the correction motor, it indicates that the correction process of the first foil 14 is completed, and the first foil 14 is conveyed according to the preset position.

The conveying process of the first foil 14 is corrected by the first correction mechanism 213, the conveying process of the composite current collector 10 is corrected by the second correction mechanism 223, and the conveying process of the second foil 15 is corrected by the third correction mechanism 233 , It can be ensured that when the first foil 14, the composite current collector 10 and the second foil 15 are on the first passing roller 216, the first foil 14, the composite current collector 10 and the second foil 15 can overlap. The three are not completely overlapped together, but partially overlapped (as shown in Figure 4), so as to be able to adjust the first foil 14, composite current collector 10 and second foil 15 relative to the welding equipment 24 Position, so as to control the weld print size on the composite current collector 10 after welding.

The first foil 14 is conveyed to the outer surface of the first metal layer 12 of the composite current collector 10 through the first foil conveying mechanism 21, and the second foil conveying mechanism 23 conveys the second foil 15 to the outer surface of the composite current collector 10. The outer surface of the second metal layer 13. After overlapping the first foil 14, the composite current collector 10 and the second foil 15 together, they are transported to the welding equipment 24 together. The first foil 14, the composite current collector 10 and the second foil 15 are in the first The passing roller 216 is in an overlapped and unwelded state, and is welded at the welding device 24.

In the embodiment of the present application, the welding equipment 24 is configured to simultaneously sandwich the first foil 14 and the second foil 15 to sandwich the composite current collector 10 between the first foil 14 and the second foil 15 and At the same time, the first foil material 14 and the second foil material 15 are welded to two opposite surfaces of the composite current collector 10 respectively.

Further, the welding equipment 24 includes a welding head 241 and a welding seat 242, the welding head 241 resists the first foil 14, the welding seat 242 resists the second foil 15, the first foil 14, the composite current collector 10, and the second foil. After the foil 15 is gathered on the first passing roller 216, it passes between the welding head 241 and the welding seat 242 together, and is used by the welding equipment 24 to simultaneously weld the first foil 14 and the second foil 15 to the composite current collector. 10 (the welding head 241 and the welding seat 242 are mutually squeezed, the first foil 14 is welded to the first metal layer 12 of the composite current collector 10, and the second foil 15 is welded to the first metal layer of the composite current collector 10. Two metal layers 13), the composite current collector 10 is sandwiched between the first foil 14 and the second foil 15. In order to achieve the above conveying purpose, please continue to refer to FIG. 2. The first foil conveying path 211, the current collector conveying path 221, and the second foil conveying path 231 are respectively arranged from top to bottom, that is, the current collector conveying path 221 It is sandwiched between the first foil conveying path 211 and the second foil conveying path 231.

After the first foil 14 is transported through the first foil transport path 211, the composite current collector 10 is transported through the current collector transport path 221, and the second foil 15 is transported through the second foil transport path 231, the first foil 14 , The composite current collector 10 and the second foil 15 are gathered at the first passing roller 216, and then pass through the welding equipment 24 together, where the welding is performed. Optionally, the welding equipment 24 further includes a welding motor (not shown), the welding head 241 is preferably an ultrasonic seam welding head 241, the output shaft of the welding motor is connected to the connecting shaft of the ultrasonic seam welding head 241, and the welding seat 242 is connected with the first A driving device 243 (such as an air cylinder, a hydraulic cylinder, etc.), the first foil 14, the composite current collector 10 and the second foil 15 pass the welding station of the welding seat 242 together, and the first driving device 243 drives the welding seat 242 during welding. Ascend (for example, if the first driving device 243 is driven by air pressure, the cylinder rises to raise the welding seat 242), and the pressure during the welding process is kept stable, the ultrasonic seam welding head 241 emits high-frequency ultrasonic vibration, and drives the ultrasonic wave through the welding motor The seam welding head 241 is rolled to weld the first foil 14 and the second foil 15 on both surfaces of the composite current collector 10 at the same time. At the same time, the composite current collector 10 after welding is transported to the rear end to continue the subsequent first The foil 14 and the second foil 15 are welded on both surfaces of the composite current collector 10.

Please continue to refer to FIG. 4, the composite current collector 10 after welding has a three-layer structure, wherein the middle layer structure is the composite current collector 10, the upper layer structure is the first foil 14, the lower layer structure is the second foil 15, and the first The foil 14 and the second foil 15 are partially overlapped with the composite current collector 10. The unwelded part of the composite current collector 10 is used to coat the active material layer, the unwelded part of the first foil 14 and the unwelded part of the second foil 15 For connecting the poles, the current on the first metal layer 12 and the second metal layer 13 of the composite current collector 10 is led out through the first foil material 14 and the second foil material 15.

After the composite current collector 10 is welded on the welding equipment 24, the composite current collector 10 after welding is wound up by the winding mechanism 25. The winding mechanism 25 includes a rolling mechanism 251, a driving mechanism 252 and a winding roller 253 arranged in sequence along the winding conveying path. The rolling mechanism 251 is located at the rear end of the welding device 24. The rolling mechanism 251 is used for synchronously rolling the welding marks on the first foil 14, the composite current collector 10 and the second foil 15, so that the welding marks of the composite current collector 10 after welding can be made smoother for subsequent follow-up The composite current collector 10 after welding is wound up by the winding roller 253.

It should be noted that: please continue to refer to FIG. 4, the composite current collector 10 after welding is not a uniform film structure, and the thickness of the welding mark where the first foil material 14, the composite current collector 10 and the second foil material 15 overlap Thicker, the thickness is relatively thin at a non-overlapping position. If the thickness is not uniform, the composite current collector 10 after welding is likely to be offset during the conveying process during the winding process. Therefore, the thickness of the welding mark is reduced by the rolling mechanism 251, thereby reducing the thickness difference of each position of the composite current collector 10 after welding, so as to better wind the composite current collector 10 after welding.

Optionally, the rolling mechanism 251 includes a steel pressing roller 2511 and an active roller 2512. The steel pressing roller 2511 and the active roller 2512 are used to sandwich the welded composite current collector 10 and form a rolling pressure on the welding mark on the composite current collector 10 . When rolling and shaping the welded composite current collector 10, the steel pressing roller 2511 is located above the first foil 14, and the steel pressing roller 2511 is connected with a second driving device 2513 (such as an air cylinder, a hydraulic cylinder, etc.), The active roller 2512 is located below the second foil 15, and the air cylinder controls the steel pressing roller 2511 to lift or press down, so as to roll and shape the welding mark. The steel pressure roller 2511 has a certain pressure on the driving roller 2512, and the linear speed of the roller surface of the driving roller 2512 is consistent with the linear speed of the composite current collector 10 after welding. In the process of conveying the composite current collector 10 after welding, there is no It will cause damage to the weld mark and prevent the weld mark from being separated after welding.

In the embodiment of the present application, by setting the driving mechanism 252, the pulling speed of the composite current collector 10 after welding can be kept consistent with the linear velocity of the ultrasonic seam welding head 241, so as to transport the composite current collector 10 after welding.

Optionally, the driving mechanism 252 includes a main traction roller 2521 and a rubber pressure roller 2522, the rolled composite current collector 10 is sandwiched between the main traction roller 2521 and the rubber pressure roller 2522, the main traction roller 2521 and the rubber pressure roller 2522 Used to drive the composite current collector 10 after rolling. The rubber pressure roller 2522 is used to apply pressure to the rolled composite current collector 10 in the direction of the main traction roller 2521. After pressing the rolled composite current collector 10, it can increase the composite current collector 10 and the main traction after welding. The pressure between the rollers 2521 increases the friction force, so that the main traction roller 2521 can drive the welded composite current collector 10 to move backwards and avoid slipping. Preferably, the surface of the rubber pressing roller 2522 is made of rubber material to avoid damage to the composite current collector 10 after welding.

Further, the outer diameter of the rubber pressing roller 2522 is smaller than the outer diameter of the main traction roller 2521. The outer diameter of the main traction roller 2521 is greater than the outer diameter of the rubber pressure roller 2522. The main traction roller 2521 should have a larger wrap angle to ensure greater friction with the composite current collector 10 after welding, and it is also the rubber pressure roller 2522 Providing a pressure-bearing position can better pull the composite current collector 10 after welding.

It should be noted that the rotation speed of the driving roller 2512 and the main traction roller 2521 are the same in order to transport the composite current collector 10 after welding. The winding mechanism 25 also includes a plurality of passing rollers, a tension mechanism, a correction mechanism, etc., which can make the welded composite current collector 10 on the winding conveying path under tension during the conveying process, so as to align the welded composite current collector. 10Conveying and rewinding. The embodiments of this application will not be repeated.

In the embodiment of the present application, the method of welding the tab on the composite current collector 10 by using the above-mentioned tab welding arrangement includes:

(1) Set the first foil 14 on the first foil conveying mechanism 21, set the composite current collector 10 on the current collector conveying mechanism 22, and set the second foil 15 on the second foil conveying mechanism 23 on.

The first foil unwinding roller 212 unwinds the first foil 14 so that the first foil 14 passes through the first correcting mechanism 213, the third passing roller 214, and the second foil in the direction of the first foil conveying path 211. The passing roller 215 and the first passing roller 216. The current collector unwinding roller 222 unwinds the composite current collector 10, and the composite current collector 10 passes through the second correction mechanism 223, the third roller 214, the second roller 215 and the first roller in the direction of the current collector conveying path 221.滚216。 Roll 216. The second foil unwinding roller 232 unwinds the second foil 15 so that the second foil 15 passes through the third correcting mechanism 233, the second passing roller 215, and the first foil in the direction of the second foil conveying path 231.过轮216。 The roller 216. The first foil 14 and the composite current collector 10 are collected at the third passing roller 214 and enter the second passing roller 215, and after being collected with the second foil 15 at the second passing roller 215, they enter the first passing roller 216 to form a first A layer structure of a composite current collector 10 is sandwiched between the foil material 14 and the second foil material 15.

(2) The first foil 14 on the first foil conveying mechanism 21, the composite current collector 10 on the current collector conveying mechanism 22, and the second foil 15 on the second foil conveying mechanism 23 pass through the welding equipment 24 Between the welding head 241 and the welding seat 242.

The first foil 14 on the first foil conveying path 211, the composite current collector 10 on the current collector conveying path 221, and the second foil 15 on the second foil conveying path 231 converge and overlap on the first passing roller 216 Later, through the welding head 241 and the welding seat 242 together, the first foil 14 is located on the outer surface of the first metal layer 12 of the composite current collector 10, and the second foil 15 is located on the second metal layer 13 of the composite current collector 10. The outer surface, and the first foil 14 and the second foil 15 are located on the same side of the composite current collector 10.

(3) Control the relative extrusion of the welding head 241 and the welding seat 242, and simultaneously weld the first foil 14 and the second foil 15 to two opposite surfaces of the composite current collector 10, so that the composite current collector 10 is sandwiched Between the first foil 14 and the second foil 15.

The cylinder is controlled to rise to make the welding seat 242 press the second foil 15, the ultrasonic seam welding head 241 emits high-frequency ultrasonic vibration, and the ultrasonic seam welding head 241 is driven to roll by the welding motor, and the first foil 14 and the second foil are simultaneously 15 are respectively welded to two opposite surfaces of the composite current collector 10.

(4) The composite current collector 10 after welding is arranged on the winding conveying path, and the winding is carried out through the winding conveying path.

The welded composite current collector 10 sequentially passes through the rolling mechanism 251 and the driving mechanism 252 along the winding conveying path, and is wound by the winding roller 253.

The beneficial effects of the tab welding device and the tab welding method provided by the embodiments of the present application include:

(1). The first foil 14 and the second foil 15 can be welded to two opposite surfaces of the composite current collector 10 at one time, so that the composite current collector 10 is sandwiched between the first foil 14 and the second foil. Between the materials 15, the welding efficiency can be improved.

(2) Before the first foil 14, the composite current collector 10 and the second foil 15 converge, the conveying speed and the conveying tension of the first foil 14, the composite current collector 10 and the second foil 15 can be individually adjusted, As well as the location of the transportation, do not interfere with each other.

(3) After the welded composite current collector 10 passes through the rolling mechanism 251 and the driving mechanism 252, it is rewinded, which can make the rewinding more smooth.

The above description is only a part of the embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Industrial applicability

Through the specific settings of the first foil conveying mechanism, the current collector conveying mechanism, the second foil conveying mechanism and the welding equipment, this application can realize the simultaneous welding of both sides of the composite current collector. The welding method is simple, the efficiency is high, and it is very suitable for large quantities Industrial production of composite current collectors.

Claims

A lug welding device, characterized in that the lug welding device comprises:

The first foil conveying mechanism is used to convey the first foil;

The current collector conveying mechanism is used to convey the composite current collector;

The second foil conveying mechanism is used to convey the second foil;

A welding device configured to sandwich the first foil and the second foil at the same time to sandwich the composite current collector between the first foil and the second foil And simultaneously welding the first foil and the second foil on two opposite surfaces of the composite current collector; and

The winding mechanism is used for winding the composite current collector with the first foil material and the second foil material welded on two opposite surfaces, respectively.
The tab welding device according to claim 1, wherein the welding equipment comprises a welding motor, a welding head, and a welding seat, and the welding head abuts the first foil during welding, and the welding seat abuts Holding the second foil, the connecting shaft of the welding head is connected with the output shaft of the welding motor.
The tab welding device according to claim 2, wherein the first driving device further comprises a first driving device, and the first driving device is connected with the welding base for driving the welding base to lift.
The tab welding device according to claim 2 or 3, wherein the welding head is an ultrasonic seam welding head.
The tab welding device according to any one of claims 1 to 4, further comprising an overlapping mechanism, the overlapping mechanism includes a first passing roller, and the first passing roller is located in the first foil conveying device. Mechanism, the rear end of the current collector conveying mechanism and the second foil conveying mechanism, the first passing roller is used to pull the overlapped first foil, the composite current collector and the second foil At least a part of the overlapping part is a three-fold overlapping structure, and the first passing roller is located at the front end of the welding equipment.
The tab welding device according to claim 5, wherein the overlapping mechanism further comprises a second passing roller, the second passing roller is located at the front end of the first passing roller, and the second passing roller Located at the rear end of the first foil conveying mechanism, the current collector conveying mechanism and the second foil conveying mechanism, the second passing roller is used to transfer the first foil and the composite current collector Overlap with the second foil.
The tab welding device according to claim 6, wherein the overlapping mechanism further comprises a third passing roller, the third passing roller is located at the front end of the second passing roller, and the third passing roller Located at the rear end of the first foil conveying mechanism, the current collector conveying mechanism and the second foil conveying mechanism, the third passing roller is used to transfer the first foil and the composite current collector Overlapping, the second passing roller is used to overlap the second foil and the overlapped first foil and the composite current collector.
The tab welding device according to any one of claims 1-7, wherein the winding mechanism comprises a rolling mechanism, the rolling mechanism is located at the rear end of the welding equipment, and the rolling mechanism It is used for synchronously rolling the welding marks on the first foil, the composite current collector and the second foil.
The tab welding device according to claim 8, wherein the rolling mechanism comprises a steel pressing roller and an active roller, and the steel pressing roller and the active roller are used to sandwich the welded composite set Fluid and rolls the welding mark on the composite current collector.
The lug welding device according to claim 9, wherein the rolling mechanism further comprises a second driving device, and the second driving device is connected with the steel pressing roller for controlling the lifting of the steel pressing roller. Up or down.
The tab welding device according to any one of claims 8-10, wherein the winding mechanism further comprises a driving mechanism, the driving mechanism is located at the rear end of the rolling mechanism, and the driving mechanism is used for In order to provide the power for transportation to the rear end of the composite current collector after rolling.
The tab welding device according to claim 11, wherein the driving mechanism comprises a main traction roller and a rubber pressure roller, and the rolled composite current collector is sandwiched between the main traction roller and the rubber pressure roller. In between, the main traction roller is used to drive the rolled composite current collector to move backward, and the squeeze roller is used to apply the rolled composite current collector to the direction of the main traction roller. pressure.
The tab welding device according to claim 12, wherein the main traction roller has a wrap angle.
The tab welding device according to any one of claims 1-13, wherein the first foil conveying mechanism comprises a first correction mechanism for correcting the first foil being conveyed, The current collector conveying mechanism includes a second correcting mechanism for correcting the composite current collector being conveyed, and the second foil conveying mechanism includes a third correcting mechanism for correcting the second foil being conveyed. Correction is performed, and the first correction mechanism, the second correction mechanism and the third correction mechanism are all located at the front end of the welding equipment.
The tab welding device according to claim 14, wherein the first correcting mechanism comprises a first correcting sensor and a first correcting component arranged in sequence, and the first correcting sensor is located on the side of the first correcting component. rear end.
The tab welding device according to claim 14, wherein the first correction mechanism further comprises a first correction controller, and the first correction assembly includes a deviation motor, a deviation correction frame, a first deviation correction roller and a first deviation correction unit. Two correction rollers, the output shaft of the correction motor is connected to the correction frame, the first correction roller and the second correction roller are both fixed on the correction frame, and the first correction sensor is electrically connected The first correction controller is electrically connected to the correction motor.
The tab welding device according to any one of claims 15 or 16, wherein the second correction mechanism has the same structure as the first correction mechanism.
The tab welding device according to any one of claims 15-17, wherein the third correcting mechanism has the same structure as the first correcting mechanism.
A method for welding a tab, characterized in that it is suitable for the tab welding device according to any one of claims 1-18, and the method comprises:

The first foil is arranged on the first foil conveying mechanism, the composite current collector is arranged on the current collector conveying mechanism, and the second foil is arranged on the second foil On the conveying mechanism;

The first foil on the first foil conveying mechanism, the composite current collector on the current collector conveying mechanism, and the second foil on the second foil conveying mechanism pass through the welding head of the welding equipment And the welding seat;

Control the relative extrusion of the welding head and the welding seat, and simultaneously weld the first foil and the second foil to the two opposite surfaces of the composite current collector, so that the composite current collector It is sandwiched between the first foil and the second foil.