CN114473195B - Battery module laser welding treatment line - Google Patents

Abstract

The invention discloses a battery module laser welding treatment line which comprises a plurality of trays, tray conveying reflux lines, a primer sticking machine, a pre-welding photographing tester, a laser welding machine, a post-welding photographing tester and a multi-shaft blanking robot which are sequentially arranged on the tray conveying reflux lines. The battery module in the tray conveyed by the tray conveying return line is stuck with primer by the primer sticking machine, the battery module in the tray conveyed by the tray conveying return line is photographed and tested by the pre-welding photographing tester, the connecting piece, which is overlapped between adjacent batteries, of the battery module is welded with the pole by the laser welding machine, the battery module in the tray conveyed by the tray conveying return line is photographed and tested by the post-welding photographing tester, and the battery module in the tray conveyed by the tray conveying return line is discharged by the multi-shaft discharging robot; so as to realize the automatic processes of the base adhesive sticking, laser welding and discharging of the battery module in the transfer process by the tray and the battery module.

Description

Battery module laser welding treatment line

Technical Field

The invention relates to the field of power battery production, in particular to a battery module laser welding treatment line.

Background

In the new energy automobile, the power battery is not used, and the power provided by the power battery meets the power requirement of the automobile so as to gradually replace the way of providing power by gasoline, diesel oil or the like.

In the production process of the power battery, a plurality of processes are involved, such as a process of attaching a primer to the bottom of the battery module, a process of testing the battery module before welding after attaching the primer, a process of welding adjacent batteries in the tested battery module in series and parallel, a process of testing the welded battery module after welding, and a process of blanking the tested battery module.

However, in the above-mentioned processes, they have poor consistency and low degree of automation, thus affecting the productivity.

Therefore, there is a need for a laser welding process line for battery modules with high automation to ensure production efficiency, so as to overcome the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to provide a battery module laser welding treatment line with high automation degree so as to ensure production efficiency.

In order to achieve the above purpose, the battery module laser welding processing line comprises a plurality of trays for bearing battery modules, tray conveying return lines for conveying the trays and enabling the trays to be conveyed in place to return and circulate, and a primer sticking machine, a pre-welding photographing tester, a laser welding machine, a post-welding photographing tester and a multi-shaft blanking robot which are sequentially arranged on the tray conveying return lines along the direction of conveying the trays by the tray conveying return lines. The tray conveying return line extends along the horizontal direction, the battery module in the tray conveyed by the tray conveying return line is sequentially held, turned over by a preset angle, rubberized and put back, the pre-welding photographing tester photographs and tests the battery module in the tray conveyed by the tray conveying return line, the laser welding machine welds a connecting sheet, which is in lap joint with a pole between adjacent batteries, in the battery module and the pole, the post-welding photographing tester photographs and tests the battery module in the tray conveyed by the tray conveying return line, and the multi-shaft blanking robot performs blanking on the battery module in the tray conveyed by the tray conveying return line.

Preferably, the tray conveying return line comprises an upper layer horizontal conveying line, a lower layer horizontal return line located under the upper layer horizontal conveying line and two tray lifting mechanisms which are in butt joint between the upper layer horizontal conveying line and the lower layer horizontal return line, wherein one tray lifting mechanism is used for transferring empty trays conveyed by the upper layer horizontal conveying line and used for grabbing battery modules by the multi-shaft blanking robot to the position of the lower layer horizontal return line, and the other tray lifting mechanism is used for transferring empty trays conveyed by the lower layer horizontal return line to the position of the upper layer horizontal conveying line.

Preferably, the tray lifting mechanism comprises a mechanism frame, a bearing lifting frame, a lifting driver, a driving wheel, a fixed wheel, a first shaft, a second shaft and a traction piece with an open head and tail, wherein the bearing lifting frame is used for bearing the tray, the lifting driver is used for driving the bearing lifting frame to lift together with the tray, the lifting driver is assembled on the mechanism frame, the output end of the lifting driver is in linear telescopic motion, the first shaft is positioned below the lifting driver, the first shaft is also in assembled connection with the output end of the lifting driver, the driving wheel is rotatably sleeved on the first shaft, the second shaft is in parallel with the upper part of the first shaft, the second shaft is also rotatably assembled on the mechanism frame, the fixed wheel is sleeved on the second shaft, the head end of the traction piece is fixedly connected with the mechanism frame, and the traction piece is far away from the position of the head end and bypasses the driving wheel and the fixed wheel and is fixedly connected with the bearing lifting frame.

Preferably, the laser welding machine comprises a frame, a tray conveying line, a clamp, a welding robot, a jacking mechanism and a laser welding head, wherein the tray conveying line is assembled on the frame, the tray conveying line is located beside the tray conveying return line and is vertically abutted with the tray conveying return line, the tray conveying line is used for conveying a tray conveyed by the tray conveying return line together with a battery module away from the tray conveying return line, the jacking mechanism is assembled on the frame and located under the tray conveying line, the clamp is assembled on the frame and located right above the tray conveying line, the clamp is also aligned with the jacking mechanism along the up-down direction of the frame, the jacking mechanism jacks up the tray conveyed by the tray conveying line together with the battery module carried by the tray so that the clamp is pressed against a connecting sheet in the battery module, the welding robot is located beside the frame, the joint head is assembled on the frame and located right under the tray conveying line, and the laser welding robot is pressed against the welding terminal by the welding robot.

Preferably, the fixture comprises a fixture carrier plate and a plurality of protective gas guide nozzles penetrating through the fixture carrier plate in the vertical direction of the frame and arranged in an array manner, the protective gas guide nozzles comprise inner cone sleeves and outer cone sleeves which are respectively big-end-up, the fixture carrier plate is assembled and connected with the frame, the outer cone sleeves are assembled on the fixture carrier plate, the inner cone sleeves are sleeved in the outer cone sleeves from above and downwards, the outer cone sleeves are downwards protruded out of the inner cone sleeves, gaps between the inner cone sleeves and the outer cone sleeves are arranged in a descending manner from top to bottom, the gaps between the inner cone sleeves and the outer cone sleeves are also arranged in a manner that the upper ends are closed, the lower ends of the inner cone sleeves are open, the outer cone sleeves are provided with input channels communicated with the upper ends of the gaps, and the jacking mechanism jacks up the tray conveyed by the tray conveying line together with the battery module carried by the tray so that the lower ends of the outer cone sleeves are abutted against the connecting sheets.

Preferably, an outer chamfer structure is arranged on the outer side wall of the lower end of the inner cone sleeve, a matched inner chamfer structure is arranged on the corresponding position of the inner side wall of the outer cone sleeve, a gap between the position of the inner cone sleeve adjacent to the outer chamfer structure and the position of the outer cone sleeve adjacent to the inner chamfer structure is smaller than a gap between the outer chamfer structure and the inner chamfer structure, a supporting convex ring table extends outwards from the outer side wall of the upper end of the inner cone sleeve, an annular cavity matched with the supporting convex ring table is arranged on the upper end of the outer cone sleeve, and the supporting convex ring table is embedded in the annular cavity in a matched mode.

Preferably, the protective gas flow guiding nozzle further comprises a threaded connecting piece located beside the inner cone sleeve, a connecting limiting piece located beside the inner cone sleeve and an elastic piece, wherein the threaded connecting piece is threaded along the upper and lower directions of the clamp carrier plate and penetrates through the outer cone sleeve in a threaded connection mode and abuts against the supporting convex ring table from the upper side, the connecting limiting piece penetrates through the outer cone sleeve and the clamp carrier plate along the upper and lower directions of the clamp carrier plate, the outer cone sleeve can slide along the upper and lower directions of the clamp carrier plate in a limiting mode on the connecting limiting piece, the elastic piece is located above the outer cone sleeve and sleeved on the connecting limiting piece, and the elastic piece constantly has a trend of driving the outer cone sleeve to slide along with the inner cone sleeve to enable the outer cone sleeve to abut against the clamp carrier plate.

Preferably, the bottom glue pasting machine comprises a film unreeling mechanism for unreeling rolled film composite films, a glue stripping mechanism for separating films in the film composite films unreeled by the film unreeling mechanism from waste materials, a waste material reeling mechanism for reeling the waste materials, a glue sucking mechanism for sucking away the films stripped by the glue stripping mechanism, and a clamp overturning mechanism for clamping the battery module and overturning the clamped battery module between a rubberizing position and an initial position, wherein the clamp overturning mechanism is arranged side by side with the glue sucking mechanism along the Y-axis direction, the glue stripping mechanism is positioned below the glue sucking mechanism, the film unreeling mechanism and the waste material reeling mechanism are positioned beside the glue stripping mechanism along the X-axis direction, and the glue sucking mechanism also obliquely moves the sucked films to the rubberizing plane of the battery module which is switched to the rubberizing position relatively to contact with the rubberizing plane, and enables the clamp overturning to be attached to the rubberizing plane.

Preferably, the stripping mechanism comprises a support bracket, a stripping plate, a waste guiding roller, a cutting device, a glue pressing device and a sliding driver for driving the glue pressing device to slide back and forth on the support bracket along the X-axis direction, wherein the stripping plate is horizontally arranged on the support bracket from the upper part of the support bracket, the waste guiding roller is arranged on the support bracket from the lower part of the support bracket, the waste guiding roller is further arranged under the stripping plate, the cutting device is arranged on the support bracket and is arranged beside the stripping plate along the X-axis direction, the glue pressing device is arranged right above the stripping plate, and the glue pressing device is connected with the sliding driver in an assembling manner and is arranged beside the stripping plate.

Preferably, the adhesive suction mechanism comprises a transfer frame, a power device for driving the transfer frame to move, and an adhesive suction device positioned below the transfer frame, wherein the adhesive suction device comprises an adhesive suction plate, a pivot shaft and an elastic piece, the adhesive suction plate is pivoted to the transfer frame by means of the pivot shaft, the axial direction of the pivot shaft is arranged along the Y-axis direction, the elastic piece is assembled on the upper sides of the transfer frame and the adhesive suction plate, the lower side of the adhesive suction plate is provided with an adhesive suction plane contacted with the sucked film, and the elastic piece makes the adhesive suction plane incline relative to the horizontal plane passing through the axis line of the pivot shaft.

Compared with the prior art, the tray conveying reflow line is used for conveying the tray and enabling the tray conveyed in place to reflow and circulate, and the bottom glue pasting machine, the pre-welding photographing testing machine, the laser welding machine, the post-welding photographing testing machine and the multi-shaft blanking robot are sequentially arranged on the tray conveying reflow line along the direction of the tray conveying reflow line, so that the tray conveying reflow line is used for conveying the tray along with the carried battery module forward, and empty trays are conveyed in a reflow manner, so that the purpose of recycling the tray is achieved; in the process of forward conveying the tray and the battery module together, the battery module is sequentially held, turned over by a preset angle, rubberized and put back by the primer sticking machine, so that the battery module with the primer stuck is put back onto the tray conveying reflux line together with the tray, and the tray and the battery module are ensured to be conveyed forward continuously by the tray conveying reflux line; photographing and testing the battery modules by a photographing tester before welding, welding connecting pieces, which are overlapped between adjacent batteries, of the battery modules by a laser welding machine, with the electrode posts, photographing and testing the battery modules in the tray conveyed by a tray conveying return line by a photographing tester after welding, and blanking the battery modules in the tray conveyed by the tray conveying return line by a multi-shaft blanking robot; to improve the automation level and the production efficiency.

Drawings

Fig. 1 is a schematic plan view of a laser welding line for a battery module according to the present invention.

Fig. 2 is a schematic plan view of a tray transfer return line in the laser welding process line of the battery module according to the present invention.

Fig. 3 is a schematic perspective view of a tray lifting mechanism in the tray conveyance return line shown in fig. 2.

Fig. 4 is a schematic plan view of the tray lifting mechanism shown in fig. 3, with most of the mechanism frame hidden and viewed from the front to the back.

Fig. 5 is a schematic perspective view of a primer applicator in a laser welding line for a battery module according to the present invention.

Fig. 6 is a schematic perspective view of a glue sucking mechanism in the bottom glue machine shown in fig. 5.

Fig. 7 is a schematic perspective exploded view of the suction attachment device in the suction attachment mechanism shown in fig. 6.

Fig. 8 is a schematic view of the suction device shown in fig. 7 in a state where the left end of the sucked film is in contact with the rubberizing plane of the battery module.

Fig. 9 is a schematic view showing a state in which the suction device shown in fig. 7 completely sticks the film to the sticking plane of the battery module.

Fig. 10 is a schematic perspective view of a peeling mechanism in the primer applicator shown in fig. 5.

Fig. 11 is a schematic perspective view of a holding and clamping turnover mechanism in the primer sticking machine shown in fig. 5.

Fig. 12 is a schematic perspective exploded view of the clasping tilting mechanism of fig. 11 after concealment of the mechanism frame and lift drive.

Fig. 13 is a schematic structural view of a film composite mold in roll form.

Fig. 14 is a schematic view showing a perspective structure of a laser welder in a laser welding process line of a battery module according to the present invention.

Fig. 15 is a schematic perspective view of the frame and pallet conveyor lines, jacking mechanism and clamps thereon in the laser welder shown in fig. 14.

Fig. 16 is a schematic view showing a three-dimensional exploded structure of the lift mechanism, the tray conveyance line, the tray, and the battery module in the laser welding machine shown in fig. 14.

Fig. 17 is a schematic perspective view of a jig in the laser welding machine shown in fig. 14.

FIG. 18 is a schematic perspective view of a shielding gas nozzle of the fixture shown in FIG. 17.

Fig. 19 is a schematic view showing the internal structure of the shielding gas nozzle shown in fig. 18, cut through the right and left planes passing through the center line thereof.

Fig. 20 is a schematic view showing a state in which the shielding gas guide nozzle and the jacking plate shown in fig. 19 hold the connecting piece together and a state in which shielding gas flows is shown.

Detailed Description

In order to describe the technical content and constructional features of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1, 16 and 20, a battery module laser welding process line 1 of the present invention includes a plurality of trays 10 for carrying battery modules 200, a tray conveying return line 20 for conveying the trays 10 and circulating the trays 10 after being conveyed in place, and a primer sticking machine 30, a pre-welding photo-taking test machine 40, a laser welding machine 50, a post-welding photo-taking test machine 60 and a multi-axis blanking robot 70 sequentially arranged on the tray conveying return line 20 along a direction (i.e., a positive direction of an X axis) in which the trays 10 are conveyed by the tray conveying return line 20. The tray conveying return line 20 extends in the horizontal direction, and provides sufficient positions for the primer attaching machine 30, the pre-welding photographing tester 40, the laser welding machine 50, the post-welding photographing tester 60 and the multi-axis blanking robot 70 to be sequentially arranged on the tray conveying return line 20 along the direction in which the tray conveying return line 20 conveys the tray 10. The primer sticking machine 30 sequentially carries out the actions of holding, overturning by a preset angle (for example, but not limited to, 90 degrees), sticking and replacing the battery modules 200 in the tray 10 conveyed by the tray conveying return line 20, and the pre-welding photographing tester 40 carries out photographing and testing treatment on the battery modules 200 in the tray 10 conveyed by the tray conveying return line 20, establishes coordinates for the welding positions of the battery modules 200 and tests the insulativity between each battery 210 and the shell in the battery modules 200; the laser welder 50 welds a connecting piece 220 of the battery module 200, which is overlapped at a pole 211 between adjacent batteries 210, with the pole 211; the post-welding photographing tester 60 photographs and tests the battery modules 200 in the tray 10 conveyed by the tray conveying return line 20, and particularly tests the insulativity between the batteries 210 and the outer shell after being connected in series and parallel in the battery modules 200; the multi-axis blanking robot 70 performs blanking on the battery modules 200 in the trays 10 conveyed by the tray conveying return line 20, namely, the multi-axis blanking robot 70 performs blanking on the battery modules 200 conveyed to the tray 10 at the leftmost side by the tray conveying return line 20 so as to free the empty tray 10, and provides conditions for the tray conveying return line 20 to return the empty tray 10 to the rightmost side along the reverse direction of the X axis, so that the purpose of recycling the tray 10 is achieved; when the empty tray 10 is reflowed to the rightmost position, the battery module 200 to be processed can be placed on the empty tray 10 by a manipulator or manually, and the tray 10 drives the battery module 200 to be transferred together under the conveying of the tray conveying reflow line 20. More specifically, the following

As shown in fig. 2, the tray conveying return line 20 includes an upper horizontal conveying line 21, a lower horizontal return line 22 located right below the upper horizontal conveying line 21, and two tray lifting mechanisms 23 abutting between the upper horizontal conveying line 21 and the lower horizontal return line 22, one tray lifting mechanism 23 (i.e., leftmost in fig. 1 or 2) is used for transferring the empty tray 10 conveyed by the upper horizontal conveying line 21, which has been gripped by the multi-axis blanking robot 70 to the battery module 200, to the lower horizontal return line 22, and the other tray lifting mechanism 23 (i.e., rightmost in fig. 1 or 2) is used for transferring the empty tray 10 conveyed by the lower horizontal return line 22 to the upper horizontal conveying line 21, so as to achieve the purpose of recycling the tray 10. Specifically, in fig. 3 and 4, the tray lifting mechanism 23 includes a mechanism frame 231, a supporting lifting frame 232, a lifting drive 233, a driving wheel 234, a fixed wheel 235, a first shaft 236, a second shaft 237, and a traction member 238 open from the end to the end; the supporting lifting frame 232 is used for bearing the tray 10, the lifting driver 233 is used for driving the supporting lifting frame 232 to lift together with the tray 10, the lifting driver 233 is assembled on the mechanism frame 231, and the output end of the lifting driver 233 performs linear telescopic motion; the first shaft 236 is positioned below the lifting driver 233, and the first shaft 236 is also assembled and connected with the output end of the lifting driver 233; the driving wheel 234 is rotatably sleeved on the first shaft 236, the second shaft 237 is positioned above the first shaft 236 in parallel, the second shaft 237 is also rotatably assembled on the mechanism frame 231, and the fixed wheel 235 is sleeved on the second shaft 237; the head end of the traction member 238 is fixedly connected with the mechanism frame 231, and the traction member 238 is fixedly connected with the bearing lifting frame 232 after bypassing the driving wheel 234 and the fixed wheel 235 at a position far away from the head end; therefore, by means of the cooperation of the driving wheel 234, the fixed wheel 235 and the traction member 238, in the process of extending and sliding the output end of the lifting driver 233, the lifting stroke of the supporting lifting frame 232 is twice the downward sliding stroke of the driving wheel 234, and in the same way, the descending stroke of the supporting lifting frame 232 is twice the upward sliding stroke of the driving wheel 234, so that the transferring speed of the tray 10 of the lifting mechanism 23 for trays is high and labor-saving. For example, traction element 238 is a chain, of course, selected as a belt according to actual needs, and accordingly, drive wheel 234 and fixed wheel 235 are sprockets or pulleys.

Referring to fig. 5, the primer attaching machine 30 includes a film unwinding mechanism 31 for unwinding a film composite film 240 in a roll shape, a stripping mechanism 32 for separating a film 241 from a waste 242 in the film composite film 240 unwound by the film unwinding mechanism 31, a waste winding mechanism 33 for winding the waste 242, a suction and pasting mechanism 34 for sucking the film 241 stripped by the stripping mechanism 32, and a holding and clamping turnover mechanism 35 for holding and clamping the battery module 200 and turning the holding and clamping battery module 200 between a rubberizing position and an initial position. The holding and turning mechanism 35 is arranged side by side with the glue sucking mechanism 34 along the Y-axis direction, and preferably, in fig. 5, the holding and turning mechanism 35 is located right behind the glue sucking mechanism 34, but not limited to the illustration in fig. 5. The stripping mechanism 32 is located below the corresponding suction mechanism 34 so that the suction mechanism 34 sucks the film 241 on the stripping mechanism 32 from above. The film unreeling mechanism 31 and the waste reeling mechanism 33 are located beside the stripping mechanism 32 in the X-axis direction, such as but not limited to the right side as shown in fig. 5; the suction and pasting mechanism 34 also moves the sucked film 241 to contact with the pasting plane 230 obliquely with respect to the pasting plane 230 of the battery module 200 switched to the pasting position, and then makes the film 241 to be pasted on the pasting plane 230 in a flip manner. Therefore, by means of the cooperation of the film unreeling mechanism 31 for unreeling the rolled film composite film 240, the stripping mechanism 32 for separating the film 241 from the waste 242 in the film composite film 240 unreeled by the film unreeling mechanism 31, the waste reeling mechanism 33 for reeling the waste 242, the suction and pasting mechanism 34 for sucking the film 241 stripped by the stripping mechanism 32, and the holding and clamping turnover mechanism 35 for holding and clamping the battery module 200 and turning the holding and clamping battery module 200 between a rubberizing position and an initial position, the bottom pasting machine 30 can automatically paste the film 241 at the rubberizing plane 230 of the battery module 200, so that the participation of people is reduced, and the rubberizing efficiency of the rubberizing plane 230 of the battery module 200 is improved. Meanwhile, the sucked film 241 is firstly moved to contact with the rubberizing plane 230 in an inclined manner by means of the rubberizing mechanism 34 relative to the rubberizing plane 230 of the battery module 200 switched to the rubberizing position, and then the film 241 is turned over to be adhered to the rubberizing plane 230, so that the sucked film 241 is gradually adhered to the rubberizing plane 230 of the battery module 200 in an inclined manner, namely, one end of the film 241 is contacted with the rubberizing plane 230 and then is transited to the rest part to be contacted with the rubberizing plane 230, and therefore, the film 241 discharges gas outwards in the adhering process to achieve the air exhausting function, and the problem of air bubbles caused by flat adhesion is effectively prevented. And more specifically, regarding the construction of the primer applicator 30, see below.

As shown in fig. 10, the stripping mechanism 32 includes a carrier 321, a stripping plate 322, a waste guiding roller 323, a cutting device 324, a glue pressing device 325, and a sliding driver 326 for driving the glue pressing device 325 to slide back and forth on the carrier 321 along the X-axis direction. The peeling plate 322 is horizontally installed on the bearing frame 321 from above the bearing frame 321, so that the peeling plate 322 is used for facilitating horizontal conveying of the film composite film 240 unwound by the film unwinding mechanism 31 along the reverse direction of the X axis; a scrap guide roller 323 is installed at the carrier 321 from below the carrier 321, and the scrap guide roller 323 is also located right below the cutter plate 322 so that the scrap 242 is folded back from the left end of the cutter plate 322 and bypasses the scrap guide roller 323; the cutting device 324 is mounted on the carrier 321 and located beside the peeling board 322 along the X-axis direction, for example, beside the left side of the peeling board 322 shown in fig. 10, so that the cutting device 324 cuts the film 241 sucked by the suction and pasting mechanism 34 from the side of the left side of the peeling board 322, so that the cut film 241 meets the predetermined length requirement; the glue pressing device 325 is located right above the peeling plate 322, the glue pressing device 325 is assembled and connected with the sliding driver 326, and the sliding driver 326 is installed on the bearing frame 321 and located beside the peeling plate 322, so that the reliability of the film 241 sucked by the glue sucking mechanism 34 is ensured, and meanwhile, the film 241 is prevented from being mixed. For example, the sliding driver 326 may be a pneumatic cylinder or a hydraulic cylinder, and is not limited thereto.

As shown in fig. 11 to 12, the holding and gripping tilting mechanism 35 includes a carrying frame 351, a first slider 352, a second slider 353, a first jaw 354, a second jaw 355, a tilting drive 356, a first linear expansion drive 357, a second linear expansion drive 358, a mechanism frame 3591, and a lifting drive 3592. The bearing frame body 351 is positioned in the mechanism frame 3591, the lifting driver 3592 is arranged at the top of the mechanism frame body 3591, the output end 3592a of the lifting driver 3592 is assembled and connected with the bearing frame body 351, and the lifting driver 3592 drives the bearing frame body 351 to lift up and down so as to meet the requirement of movement; preferably, the output end 3592a of the lifting driver 3592 is disposed downward, so as to simplify the assembly connection between the output end 3592a and the carrier 351, but not limited thereto. The first slide seat 352 and the second slide seat 353 are respectively arranged on the bearing frame body 351 in a mutually opposite manner Ji Dehua along the X-axis direction, the first clamping jaw 354 is rotatably assembled at one side of the first slide seat 352 facing the second slide seat 353, so that the first clamping jaw 354 is used for pressing the battery module 200 besides sliding along with the first slide seat 352; the second jaw 355 is rotatably fitted at a side of the second slide 353 facing the first slide 352 such that the second jaw 355 serves to compress the battery module 200 in addition to sliding along the second slide 353; second jaw 355 is also aligned with first jaw 354 in the X-axis direction to meet the need for first jaw 354 and second jaw 355 to collectively cradle battery module 200; the first linear telescopic driver 357 and the second linear telescopic driver 358 are respectively arranged on the bearing frame body 351, the bearing frame body 351 provides supporting function and assembling places for the first linear telescopic driver 357 and the second linear telescopic driver 358, and telescopic ends of the first linear telescopic driver 357 and the second linear telescopic driver 358 respectively do telescopic sliding along the X-axis direction; the power of the first linear expansion driver 357 is smaller than that of the second linear expansion driver 358, the expansion stroke of the expansion end of the first linear expansion driver 357 is larger than that of the expansion end of the second linear expansion driver 358, the expansion end of the first linear expansion driver 357 is assembled and connected with the first sliding seat 352 so as to meet the power requirement of the first sliding seat 352 sliding along the X-axis direction, and the expansion end of the second linear expansion driver 358 is assembled and connected with the second sliding seat 353 so as to meet the power requirement of the second sliding seat 353 sliding along the X-axis direction; the overturning driver 356 drives the battery module 200 clamped by the first clamping jaw 354 and the second clamping jaw 355 to overturn forward and upward by 90 degrees to be in the rubberizing position, so that the rubberizing plane 230 of the battery module 200 at the moment is opposite to the film 241 overturned backward and upward by 90 degrees, and the reliability of the bonding of the film 241 on the rubberizing plane 230 is ensured. Preferably, the tumble driver 356 is located at the side of the second slide 353 facing away from the first slide 352, i.e. the tumble driver 356 is located at the left side of the second slide 353, spaced apart from the second clamping jaw 355 located at the right side of the second slide 353, to ensure rationality and compactness of the arrangement of the tumble driver 356 and the second clamping jaw 355 on the second slide 353. For example, the flipping driver 356 is a gear motor to provide a larger flipping power, and of course, the flipping driver 356 may be a motor according to practical needs, which is not limited thereto.

In the clamping turnover mechanism 35, the first clamping jaw 354 and the second clamping jaw 355 clamp the battery module 200 in the tray 10 conveyed by the tray conveying return line 20 from the left side and the right side of the battery module 200 by means of the cooperation of the first linear telescopic driver 357 and the second linear telescopic driver 358, so that clamping is quick; importantly, by means of the cooperation of the second linear telescopic driver 358 with short stroke and high power and the first linear telescopic driver 357 with long stroke and low power, the sliding force born by the second clamping jaw 355 is larger than the sliding force born by the first clamping jaw 354, so that in the clamping process of the battery module 200, the second clamping jaw 355 serves as a reference, and the first clamping jaw 354 serves as a pressing function, and the clamping turnover mechanism 35 is compatible with clamping of battery modules 200 with different specifications.

As shown in fig. 6 to 9, the adhesive suction mechanism 34 includes a transfer frame 341, a power device 342 for driving the transfer frame 341 to move, and an adhesive suction device 343 for sucking and discharging the film 241, which is located below the transfer frame 341. The suction device 343 comprises a suction plate 3431, a pivot 3432 and an elastic member 3433; the suction plate 3431 is pivoted to the transfer frame 341 by a pivot shaft 3432, and the pivot shaft 3432 is arranged along the Y-axis direction, so that the suction plate 31 can pivot up and down around the pivot shaft 32 by a small angle, for example, in the range of 0 to 10 degrees; the elastic member 3433 is assembled on the upper side of the transfer frame 341 and the suction plate 3431, the lower side of the suction plate 3431 is provided with a suction plane 3434 contacting the sucked film 241, and the elastic member 3433 makes the suction plane 3434 incline relative to the horizontal plane P passing through the axis line C of the pivot shaft 3432, as shown in FIG. 8; for example, in fig. 8, the suction plane 311 is arranged obliquely from left to right, and the included angle between the suction plane 3434 and the horizontal plane P is greater than 0 and less than 10 degrees, but not limited thereto. And as to the specific structure of the suction rubberizing mechanism 34, see the following description:

As shown in fig. 7, the elastic members 3433 are divided into two left sides and two right sides, and the elastic force of the two left sides is greater than that of the two right sides, so that the suction plane 3434 is obliquely arranged under the cooperation of the four elastic members 3433 by means of the difference between the elastic forces of the two left sides and the elastic force of the two right sides; naturally, the suction plane 3434 may be inclined to the smaller side by the difference between the lengths of the left and right sides; the pivot shaft 3432 is provided between the elastic members 3433 along the left and right sides; this arrangement effectively ensures that the suction plane 3434 is normally maintained in an inclined state with respect to the horizontal plane P. For example, the elastic member 3433 is a compression spring, so as to simplify the assembly relationship between the elastic member 3433 and the transfer frame 341 and the suction plate 3431, but not limited thereto.

As shown in fig. 6, the adhesive suction mechanism 341 further includes a turning driver 344 mounted on the transfer frame 341, the turning driver 344 drives the adhesive suction device 343 to turn between a horizontal position and an upright position, when the adhesive suction device 343 is in the horizontal position, the adhesive suction plate 3431 is in a lying state, when the adhesive suction device 343 is in the upright position, the adhesive suction plate 3431 is in an upright state, specifically, the turning driver 344 drives the adhesive suction device 343 to turn back upwards by 90 degrees and to be in the upright position, and at this time, the turning driver 344 drives the adhesive suction device 343 to turn back forwards upwards by 90 degrees and to be in the horizontal position.

As shown in fig. 6, the power unit 342 includes an X-axis transfer module 3421, a Y-axis transfer module 3422, and a Z-axis transfer module 3423. The X-axis transfer module 3422 is assembled at the output end of the Y-axis transfer module 3421, the Z-axis transfer module 3423 is assembled at the output end of the X-axis transfer module 3422, and the transfer frame 341 is assembled at the output end of the Z-axis transfer module 3423, so that the power device 342 can drive the transfer frame 341 to translate along with the suction device 343 on the transfer frame 341 in the XYZ three-axis direction, thereby meeting the requirement that the suction device 343 picks up the film 241 from the stripping mechanism 32, turns the picked film 241 backwards and upwards by 90 degrees, and then sticks the film 241 turned by 90 degrees to the rubberizing plane 230 of the battery module 200 at the rubberizing position. For example, each of the X-axis transfer module 3421, the Y-axis transfer module 3422, and the Z-axis transfer module 3423 may be composed of a motor, a screw, a nut, and a translation seat for forming the output end, or may be composed of a motor, a belt drive, and a translation seat for forming the output end, which are well known in the art, and will not be described herein.

The working principle of the primer sticking machine is described with reference to fig. 5 to 9: when the battery module 200 conveyed by the tray conveying return line 20 comes under the holding and clamping turnover mechanism 35, the holding and clamping turnover mechanism 35 holds the battery module 200 on the tray conveying return line 20 and turns over the battery module 200 forward and upward by 90 degrees, so that the rubberizing plane 230 of the battery module 200 is switched from the original horizontal arrangement to the vertical arrangement and is positioned at the rubberizing position; in the process of holding and turning over the battery module 200, the adhesive suction mechanism 34 also sucks the adhesive film 241 from the adhesive stripping mechanism 32, and turns over the adhesive film 241 by 90 degrees backward and upward, so that the adhesive film 241 turned over by 90 degrees is opposite to the adhesive plane 230; when the film 241 faces the rubberizing plane 230, the rubberizing mechanism 34 makes the film 241 cling to the rubberizing plane 230; when the rubberizing plane 230 finishes rubberizing, the battery module 200 is turned down by 90 degrees by the clamp turning mechanism 35 to be switched to the initial position, so that the clamp turning mechanism 35 is convenient for putting the battery module 200 back onto the tray conveying return line 20 again, the tray conveying return line 20 continues to convey the rubberized battery module 200 forwards, and meanwhile, the tray conveying return line 20 also conveys a new battery module 200 to be rubberized to the position right below the clamp turning mechanism 35; and the suction rubberizing mechanism 34 resets toward the direction of grabbing the film 241 to prepare for the next rubberizing.

As shown in fig. 14 and 15, the laser welding machine 50 includes a frame 51, a tray conveyance line 52, a jig 53, a welding robot 54, a lifting mechanism 55, and a laser welding head 56. The tray conveying line 52 is assembled on the frame 51, preferably, the tray conveying line 52 is installed at the horizontal carrier plate 511 in the middle of the frame 51, so as to provide sufficient positions for installing the clamp 53 on the frame 51, but not limited thereto; the tray conveying line 52 is located beside the tray conveying return line 20 and is vertically abutted with the tray conveying return line 52, and the tray conveying line 52 is used for conveying the tray 10 conveyed by the tray conveying return line 20 together with the battery module 200 away from the tray conveying return line 20, preferably, the tray conveying line 52 conveys the tray 10 along the Y-axis direction, but not limited thereto; the jacking mechanism 55 is assembled on the frame 51 and is located right below the tray conveying line 52, so that the jacking mechanism 55 jacks up the tray 10 conveyed by the tray conveying line 52 together with the battery module 200 carried by the tray 10, preferably, the jacking mechanism 55 is installed at the horizontal carrier 511 of the frame 51, but not limited thereto; the clamp 53 is assembled on the frame 51 and is located right above the tray conveying line 52, the clamp 53 is aligned with the jacking mechanism 55 along the up-down direction of the frame 51, the jacking mechanism 55 jacks up the tray 10 conveyed by the tray conveying line 52 together with the battery module 200 carried by the tray 10, so that the clamp 53 is abutted against the connecting sheet 220 in the battery module 200, and the state is shown in fig. 20; the welding robot 54 is located beside the frame 51, such as, but not limited to, the rear side of the frame 51 shown in fig. 14, the laser welding head 56 is mounted on the end joint 541 of the welding robot 54, the laser welding head 56 welds the pole 211 with the connection piece 220 pressed by the clamp 53 under the cooperation of the welding robot 54, and the tray conveyor line 52 also conveys the tray 10 together with the welded battery module 200 back onto the tray conveying return line 20. Specifically, in fig. 14, the laser welding machine 50 further includes a CCD camera 57, where the CCD camera 57 is assembled at the end joint 541 of the welding robot 54 and located beside the laser welding head 56, so that by using the CCD camera 57, the positional relationship between the connecting piece 220 and the pole 211 can be collected before welding, and data is provided for welding, so that the reliability of welding between the connecting piece 220 and the pole 211 by the laser welding head 56 under the driving of the welding robot 54 is ensured.

In the laser welding machine 50, since the tray conveying line 52 is assembled to the frame 51 and horizontally conveys the tray 10 and the battery module 200 supported by the tray 10, the jacking mechanism 55 is assembled to the frame 51 and positioned right below the tray conveying line 52, the clamp 53 is assembled to the frame 51 and positioned right above the tray conveying line 52, and the clamp 53 is aligned with the jacking mechanism 55 along the up-down direction of the frame 51; when the tray 10 conveyed by the tray conveying return line 20 is transferred to a position aligned with the jacking mechanism 55 by the tray conveying line 52, at this time, the tray 10 conveyed by the tray conveying line 52 is jacked up together with the battery module 200 carried by the tray 10 by the jacking mechanism 55, so that the clamp 53 is pressed against the connecting piece 220 in the battery module 200, that is, the connecting piece 220 is clamped by the clamp 53 and the jacking mechanism 55, so that the connecting piece 220 and the pole 211 of the battery 210 are surrounded by the lower end part of the outer cone sleeve 532b, as shown in fig. 20; next, the pole 211 is automatically welded with the connecting piece 220 pressed by the clamp 53 by the laser welding head 56 under the cooperation of the welding robot 54; after the welding is completed, the tray 10 is placed on the tray conveying line 52 by the jacking mechanism 55, and the tray 10 and the battery module 200 which is well welded are conveyed back to the tray conveying return line 20 by the tray conveying line 52, so that the welding efficiency is greatly improved. In addition, regarding a more specific structure of the laser welder 50, see the following description:

As shown in fig. 14, the welding robot 54 is a six-axis robot, so that the welding robot 54 can perform six-axis movement, and the welding robot 54 can flexibly and reliably drive the laser welding head 56 to perform six-axis movement, so that the laser welding head 56 can better weld the welding positions of the connecting sheet 220 and the pole 211 together; of course, the welding robot 54 may be a three-axis robot, a four-axis robot, or a five-axis robot according to practical needs, so as to reduce the use cost of the welding robot 54.

As shown in fig. 17 to 19, the fixture 53 includes a fixture carrier 531 and sixteen shielding gas nozzles 532 penetrating the fixture carrier 531 along the up-down direction of the frame 51 and arranged in an array, for example, in fig. 17, all shielding gas nozzles 532 are arranged in two rows, so that each row includes eight shielding gas nozzles 532, but not limited thereto. The shielding gas guide nozzle 532 includes an inner cone sleeve 532a and an outer cone sleeve 532b each having a large upper portion and a small lower portion; the outer cone sleeve 532b is assembled on the clamp carrier plate 531, and the clamp carrier plate 531 provides supporting function and assembly place for the outer cone sleeve 532b; the inner cone sleeve 532a is sleeved in the outer cone sleeve 532b from above and downwards, and the outer cone sleeve 532b provides a supporting function and an assembling place for the inner cone sleeve 532a, so that the inner cone sleeve 532a and the outer cone sleeve 532b are fixed together; the outer cone 532b protrudes downward from the inner cone 532a; the gap 532c between the inner cone sleeve 532a and the outer cone sleeve 532b is gradually decreased from top to bottom, that is, the upper end of the gap 532c is large and the lower end of the gap 532c is small, preferably, the gap 532c is gradually decreased from top to bottom, so that the gap 532c is gradually decreased from top to bottom; the gap 532c between the inner and outer cones 532a, 532b is also in an arrangement with a closed upper end and an open lower end to prevent the shielding gas from flowing away from the upper end of the gap 532c, the outer cone 532b being provided with an input channel 5321 communicating with the upper end of the gap 532c for interfacing with an external shielding gas supply to ensure that the external shielding gas supply flows shielding gas from the input channel 5321 into the upper end of the gap 532 c; therefore, by means of the arrangement of the shielding gas guide nozzle 532, after the battery module 200 is clamped by the clamp 53 and the jacking mechanism 55, the connecting piece 220 is pressed by the lower end portion of the outer cone sleeve 532b, and the welding position of the connecting piece 220 and the pole 211 is surrounded by the lower end portion of the outer cone sleeve 532b, and the state is shown in fig. 20; by means of the arrangement that the gap 532c between the inner cone sleeve 532a and the outer cone sleeve 532b is large in upper portion and small in lower portion, the protective gas flowing into the gap 532c from the input channel 5321 of the outer cone sleeve 532b fills the upper portion of the gap 532c and then flows to the lower portion of the gap 532c, the flowing time of the protective gas is prolonged, the using amount of the protective gas can be reduced on one hand, and on the other hand, the welding portions of the connecting sheet 220 and the pole 211 are effectively prevented from being oxidized, and therefore welding quality is improved. It will be appreciated that the number of shielding gas nozzles 532 may be other according to practical needs, and is not limited to the illustration.

As shown in fig. 14, the laser welder 50 also includes a dust extractor 58, the dust extractor 58 being located beside the welding robot 54, such as, but not limited to, beside the rear side shown in fig. 14; the front side and the rear side of the clamp carrier plate 531 are respectively provided with a dust suction head 533 communicated with the dust remover 58, all the protective gas guide nozzles 532 are positioned between the dust suction head 533 at the front side of the clamp carrier plate 531 and the dust suction head 533 at the rear side of the clamp carrier plate 531, and the air suction inlet 53311 of the dust suction head 533 is positioned obliquely above the inner cone sleeve 532 a; so as to suck the exhaust gas generated during the welding process by the cooperation of the dust suction head 533 and the dust remover 58, thereby ensuring the reliability of the welding. Specifically, in fig. 15, the dust suction heads 533 on the front side of the clamp carrier plate 531 and the dust suction heads 533 on the rear side of the clamp carrier plate 531 are two, the dust collector 58 is connected with a main pipe 581, the main pipe 581 branches into a left branch pipe 582 and a right branch pipe 583, a left middle valve 591 is mounted at the left corner on the rear side of the clamp carrier plate 531, a right middle valve 592 is mounted at the right corner on the rear side of the clamp carrier plate 531, a left tail valve 593 is mounted at the left corner on the front side of the clamp carrier plate 531, a right tail valve 594 is mounted at the right corner on the front side of the clamp carrier plate 531, the tail end of the left branch pipe 582 is connected with the input end of the left middle valve 591 in an assembling manner, the output end of the left middle valve 591 is connected with the left middle pipe 595 and the left tail pipe 596 on the rear side in an assembling manner, the left tail pipe 596 on the rear side is connected with the dust suction 533 on the left side on the rear side in an assembling manner, the output end of the left tail valve 593 is assembled and connected with one end of a front left tail pipe 596, the other end of the front left tail pipe 596 is assembled and connected with a front left dust suction head 533, the tail end of the right branch pipe 583 is assembled and connected with the input end of a right intermediate valve 592, the output end of the right intermediate valve 592 is assembled and connected with a right intermediate pipe 597 and a rear right tail pipe 598 respectively, the rear right tail pipe 598 is assembled and connected with the rear right dust suction head 533, the front end of the right intermediate pipe 597 is assembled and connected with the input end of a right tail valve 594, the output end of the right tail valve 594 is assembled and connected with one end of the front right tail pipe 598, the other end of the front right tail pipe 598 is assembled and connected with the front right dust suction head 533, on the one hand, the design of which achieves the purposes of reasonable and compact arrangement is realized, on the other hand, each dust suction head 533 can work independently by means of the cooperation of the left intermediate valve 591, the right intermediate valve 592, the left tail valve 593 and the right tail valve 594, alternatively, multiple or all of the dust extraction tips 533 may be operated simultaneously, thus allowing for greater flexibility in the operation of the dust extraction tips 533. More specifically, in fig. 17, the air suction opening 5331 is a rectangular opening, and the length direction of the air suction opening 5331 is arranged along the length direction of the fixture carrier 531, so that the number of the dust suction heads 533 can be reduced, but the invention is not limited thereto.

As shown in fig. 19 and 20, the outer side wall of the lower end of the inner cone 532a is provided with an outer chamfer 5322, and the corresponding position of the inner side wall of the outer cone 532b is provided with a matched inner chamfer 5323, preferably, the gap (indicated by D1 in the enlarged view of fig. 19) between the position of the inner cone 532a adjacent to the outer chamfer 5322 and the position of the outer cone 532b adjacent to the inner chamfer 5323 is smaller than the gap (indicated by D1 in the enlarged view of fig. 19) between the outer chamfer 5322 and the inner chamfer 5323, so that the design has the following advantages: on the one hand, the flow direction of the shielding gas is changed, on the other hand, the shielding gas entering the upper end of the gap 532c flows from the upper end of the gap 532c with relatively large size to the lower end of the gap 532c with relatively small size, and then flows from the lower end of the gap 532c with relatively small size to the tail end of the gap 532c with middle size, so that the flow time of the shielding gas is effectively prolonged, and the utilization efficiency of the shielding gas is improved. Specifically, in fig. 18 to 20, a supporting boss 5324 extends outwards from the outer side wall of the upper end of the inner cone 532a, an annular cavity 5325 matching the supporting boss 5324 is formed at the upper end of the outer cone 532b, the supporting boss 5324 is embedded in the annular cavity 5325 in a matching manner, so that the inner cone 532a is assembled in the outer cone 532b by matching the supporting boss 5324 with the annular cavity 5325, and the upper end of the gap 532c is closed by the supporting boss 5324; preferably, the support collar 5324 and the outer cone 532b are flush with one another above each other to facilitate the below described threaded connection 532d securing the inner cone 532a to the outer cone 532b to facilitate the assembly and disassembly of the inner and outer cones 532a, 532 b. More specifically, in fig. 18 to 20, the shielding gas guide nozzle 532 further includes a screw connection piece 532d located at a side of the inner cone 532a, the screw connection piece 532d being screw-coupled to the outer cone 532b in an up-down direction of the jig carrier 531, i.e., the screw connection piece 532d is screw-coupled to the outer cone 532b through the outer cone 532b so as to be assembled to the outer cone 532b or disassembled from the outer cone 532b by screwing the screw connection piece 532 d; the screw connection piece 532d also presses the supporting convex ring platform 5324 from above, so that the supporting convex ring platform 5324 is clamped between the screw connection piece 532d and the outer cone sleeve 532b, and the purpose of fixing the inner cone sleeve 532a at the outer cone sleeve 532b is achieved. For example, the threaded connection 532d is a screw, which is disposed around the inner cone sleeve 532a, so as to improve the fixing reliability between the inner cone sleeve 532a and the outer cone sleeve 532b, but not limited thereto.

As shown in fig. 18 to 20, in order to provide the contact between the lower end portion of the outer cone 532b and the connection piece 220 with a buffered elasticity, the shielding gas nozzle 532 further includes connection stoppers 532e and elastic pieces 532f, which are respectively located beside the inner cone 532 a. The connection limiting piece 532e is penetrated through the outer cone sleeve 532b and the clamp carrier plate 531 along the up-down direction of the clamp carrier plate 531, so that the connection limiting piece 532e and the clamp carrier plate 531 are relatively static, and the outer cone sleeve 532b can slide on the connection limiting piece 532e in a limiting manner along the up-down direction of the clamp carrier plate 531; the elastic member 532f is located above the outer cone sleeve 532b and sleeved on the connection limiting member 532e, and the elastic member 532f has a constant tendency to drive the outer cone sleeve 532b and the inner cone sleeve 532a to slide together to a position where the outer cone sleeve 532b abuts against the fixture carrier 531, and the state is shown in fig. 19. Specifically, the connection limiting members 532e are respectively disposed around the inner taper sleeve 532a, and each connection limiting member 532e corresponds to one elastic member 532f, so as to ensure that the elastic forces applied to the four corners of the outer taper sleeve 532b are consistent, and thus the buffer expansion and contraction of the outer taper sleeve 532b relative to the fixture carrier 531 is more reliable. For example, the elastic member 532f is a compression spring, the limiting connecting member 532e is a screw, and a threaded end of the screw is in threaded connection with the fixture carrier 531, but not limited thereto; the tray conveying line 52 is a belt conveying line, but not limited thereto.

Compared with the prior art, by means of the cooperation of a plurality of trays 10 for bearing the battery modules 200, a tray conveying return line 20 for conveying the trays 10 and enabling the trays 10 conveyed in place to return and circulate, and a primer sticking machine 30, a pre-welding photographing test machine 40, a laser welding machine 50, a post-welding photographing test machine 60 and a multi-shaft blanking robot 70 which are sequentially arranged on the tray conveying return line 20 along the direction of conveying the trays 10 by the tray conveying return line 20, the tray 10 is conveyed forwards together with the bearing battery modules 200 by the tray conveying return line 20, and empty trays 10 are conveyed in a backflow mode, so that the purpose of recycling the trays 10 is achieved; in the process of forward conveying the tray 10 and the battery module 200 together, the battery module 200 is sequentially held, turned over by a preset angle, rubberized and put back by the primer sticking machine 30, so that the battery module 200 with the primer stuck is put back to the tray conveying return line 20 together with the tray 10, and the tray 10 and the battery module 200 are ensured to be continuously conveyed forward by the tray conveying return line 20; the battery module 200 is photographed and tested by the photographing test machine 40 before welding, the connecting sheet 220 which is overlapped at the polar column 211 between the adjacent batteries 210 in the battery module 200 is welded with the polar column 211 by the laser welding machine 50, the battery module 200 in the tray 10 conveyed by the tray conveying return line 20 is photographed and tested by the photographing test machine 60 after welding, and the battery module 200 in the tray 10 conveyed by the tray conveying return line 20 is discharged by the multi-shaft discharging robot 70; to improve the automation level and the production efficiency.

The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (10)

1. The utility model provides a battery module laser welding treatment line, includes a plurality of trays that are used for bearing the battery module, is used for carrying the tray and makes after carrying in place the tray of tray backward flow circulation carries the direction of tray is in paste primer machine, before welding photo tester, laser welding machine, after welding photo tester and multiaxis unloading robot that the tray carries the reflux line and arrange in proper order, the tray carries the reflux line to extend along the horizontal direction, paste primer machine to battery module in the tray that the tray carried the reflux line carries out in proper order and holds, overturn preset angle, rubberizing and put back the action, before welding photo tester to battery module in the tray that the tray carried the reflux line carries out and take a picture and test the processing, the laser welding machine to the connection piece of overlap joint in the post between adjacent battery in the battery module department and this post welding, after welding test machine to take a picture and handle in the tray that the tray carried the reflux line carries out in proper order and handle the battery module in the tray, the battery module carries out the action of putting back in the tray carries out the reflux line.

2. The battery module laser welding processing line according to claim 1, wherein the tray conveying return line comprises an upper horizontal conveying line, a lower horizontal return line located right below the upper horizontal conveying line, and two tray lifting mechanisms which are in butt joint between the upper horizontal conveying line and the lower horizontal return line, one tray lifting mechanism is used for transferring an empty tray conveyed by the upper horizontal conveying line and used for grabbing a battery module by the multi-shaft blanking robot to the position of the lower horizontal return line, and the other tray lifting mechanism is used for transferring an empty tray conveyed by the lower horizontal return line to the position of the upper horizontal conveying line.

3. The battery module laser welding processing line according to claim 2, wherein the tray lifting mechanism comprises a mechanism frame, a bearing lifting frame, a lifting driver, a driving wheel, a fixed wheel, a first shaft, a second shaft and a traction piece with an open head and tail, the bearing lifting frame is used for bearing the tray, the lifting driver is used for driving the bearing lifting frame to lift together with the tray, the lifting driver is assembled on the mechanism frame, the output end of the lifting driver is in linear telescopic motion, the first shaft is positioned below the lifting driver, the first shaft is also assembled and connected with the output end of the lifting driver, the driving wheel is rotatably sleeved on the first shaft, the second shaft is positioned above the first shaft in parallel, the second shaft is also rotatably assembled on the mechanism frame, the fixed wheel is sleeved on the second shaft, the head end of the traction piece is fixedly connected with the mechanism frame, and the traction piece is positioned away from the head end and bypasses the driving wheel and the fixed wheel and is fixedly connected with the lifting frame.

4. The battery module laser welding process line according to claim 1, wherein the laser welding machine comprises a frame, a tray conveying line, a clamp, a welding robot, a jacking mechanism and a laser welding head, wherein the tray conveying line is assembled on the frame, the tray conveying line is located beside the tray conveying return line and vertically butted with the tray conveying return line, the tray conveying line is used for conveying a tray conveyed by the tray conveying return line together with a battery module away from the tray conveying return line, the jacking mechanism is assembled on the frame and located right below the tray conveying line, the clamp is assembled on the frame and located right above the tray conveying line, the clamp is also aligned with the jacking mechanism along the up-down direction of the frame, the jacking mechanism jacks up a tray conveyed by the tray conveying line together with the battery module carried by the tray so as to enable the clamp to press against a connecting sheet in the battery module, the robot is located beside the frame, the clamp is assembled on the tray conveying line together with the laser welding robot, and the laser welding machine is matched with the welding head to press the connecting sheet.

5. The laser welding line for battery modules according to claim 4, wherein the fixture comprises a fixture carrier plate and a plurality of shielding gas flow guide nozzles penetrating the fixture carrier plate in the up-down direction of the frame and arranged in an array, the shielding gas flow guide nozzles comprise inner cone sleeves and outer cone sleeves which are respectively big-end-up, the fixture carrier plate is assembled and connected with the frame, the outer cone sleeves are assembled on the fixture carrier plate, the inner cone sleeves are sleeved in the outer cone sleeves from top to bottom, the outer cone sleeves are downwards protruded out of the inner cone sleeves, gaps between the inner cone sleeves and the outer cone sleeves are arranged in a decreasing manner from top to bottom, the gaps between the inner cone sleeves and the outer cone sleeves are also arranged in a manner that the upper ends are closed and the lower ends are open, the outer cone sleeves are provided with input channels communicated with the upper ends of the gaps, and the jacking mechanism jacks the tray conveyed by the tray conveying line together with the battery carried by the tray so that the tray conveying line jacks up the end portions of the module modules to the outer cone sleeves.

6. The battery module laser welding processing line according to claim 5, wherein an outer chamfer structure is formed on the outer side wall of the lower end of the inner cone sleeve, a matched inner chamfer structure is arranged on the corresponding position of the inner side wall of the outer cone sleeve, a gap between the position of the inner cone sleeve adjacent to the outer chamfer structure and the position of the outer cone sleeve adjacent to the inner chamfer structure is smaller than a gap between the outer chamfer structure and the inner chamfer structure, a supporting convex ring table extends outwards from the outer side wall of the upper end of the inner cone sleeve, an annular cavity matched with the supporting convex ring table is formed on the upper end of the outer cone sleeve, and the supporting convex ring table is embedded in the annular cavity in a matched mode.

7. The laser welding line for battery modules according to claim 6, wherein the shielding gas guide nozzle further comprises a threaded connection piece located beside the inner cone sleeve, a connection limiting piece located beside the inner cone sleeve, and an elastic piece, the threaded connection piece is threaded through the outer cone sleeve along the up-down direction of the clamp carrier plate and is pressed against the bearing convex ring table from above, the connection limiting piece is threaded through the outer cone sleeve and the clamp carrier plate along the up-down direction of the clamp carrier plate, the outer cone sleeve can slide in a limiting manner on the connection limiting piece along the up-down direction of the clamp carrier plate, the elastic piece is located above the outer cone sleeve and is sleeved on the connection limiting piece, and the elastic piece constantly has a tendency of driving the outer cone sleeve to slide together with the inner cone sleeve to a position where the outer cone sleeve abuts against the clamp carrier plate.

8. The battery module laser welding processing line according to claim 1, wherein the bottom pasting machine comprises a film unreeling mechanism for unreeling a rolled film composite film, a stripping mechanism for separating the film in the film composite film unreeled by the film unreeling mechanism from waste, a waste reeling mechanism for reeling the waste, a glue sucking mechanism for sucking the film stripped by the stripping mechanism, and a clamp overturning mechanism for clamping the battery module and overturning the clamped battery module between a rubberizing position and an initial position, the clamp overturning mechanism is arranged side by side with the glue sucking mechanism along the Y axis direction, the glue stripping mechanism is positioned below the glue sucking mechanism, the film unreeling mechanism and the waste reeling mechanism are positioned beside the glue stripping mechanism along the X axis direction, and the glue sucking mechanism also moves the sucked film to be contacted with the rubberizing plane in a mode of relatively switching to the rubberizing position, and then the glue is adhered to the rubberizing plane.

9. The battery module laser welding process line according to claim 8, wherein the peeling mechanism comprises a support bracket, a peeling plate, a waste guide roller, a cutting device, a glue pressing device and a sliding driver for driving the glue pressing device to slide back and forth on the support bracket along the X-axis direction, the peeling plate is horizontally arranged on the support bracket from the upper side of the support bracket, the waste guide roller is arranged on the support bracket from the lower side of the support bracket, the waste guide roller is also arranged right below the peeling plate, the cutting device is arranged on the support bracket and is arranged beside the peeling plate along the X-axis direction, the glue pressing device is arranged right above the peeling plate, the glue pressing device is connected with the sliding driver in a fitting manner, and the sliding driver is arranged on the support bracket and is arranged beside the peeling plate.

10. The laser welding line for battery modules according to claim 8, wherein the suction and pasting mechanism comprises a transfer frame, a power device for driving the transfer frame to move, and a suction and pasting device positioned below the transfer frame, the suction and pasting device comprises a suction and pasting plate, a pivot shaft and an elastic member, the suction and pasting plate is pivoted to the transfer frame by the pivot shaft, the axial direction of the pivot shaft is arranged along the Y-axis direction, the elastic member is assembled on the upper sides of the transfer frame and the suction and pasting plate, the lower side of the suction and pasting plate is provided with a suction and pasting plane contacted with the sucked film, and the elastic member makes the suction and pasting plane incline relative to the horizontal plane passing through the axis line of the pivot shaft.