Lithium ion battery insulation film feeding and welding device and method

Abstract

The application discloses a lithium ion battery insulation film loading and welding device and method, and relates to the technical field of lithium battery production. The device comprises a work turntable, a bending and wrapping mechanism, an insulation film loading mechanism, an insulation film in-place detection mechanism, a battery cell loading mechanism, a film pushing and welding mechanism, a welding quality detection mechanism and a discharging mechanism. The work turntable can rotate to drive the bending and wrapping mechanism to pass through the insulation film loading mechanism, the insulation film in-place detection mechanism, the battery cell loading mechanism, the film pushing and welding mechanism, the welding quality detection mechanism and the discharging mechanism in sequence. The application has the advantages that: the ultrasonic welding process is used for battery cell film coating, the time consumption is short, the work efficiency is high, and the product quality is improved compared with the hot pressing process; the structure is simple, and the equipment failure rate is low; the multi-station cooperation of the turntable improves the equipment utilization rate and production efficiency, and improves the whole line production rhythm.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery production, in particular to a lithium ion battery insulation film feeding and welding device and method. BACKGROUND

[0002] The assembly process of a lithium ion battery generally comprises pole piece winding, hot pressing, butterfly welding, cover plate welding, core combining and rubber coating, film coating and shell entering. Before the winding core enters the shell, a layer of plastic insulation film is wrapped on the surface of the winding core to prevent short circuit and foreign matter from entering the winding core.

[0003] The commonly used film coating process at present is to use resistance heat generation to scald the insulation film on the cover plate of the battery cell. The patent document with the publication number CN107275682A discloses a lithium battery cell outer film hot melting mechanism, which comprises a cell feeding mechanism, a discharging mechanism, an insulation film feeding mechanism and a hot melting film coating mechanism. The insulation film feeding, cell feeding, insulation film bending and wrapping, insulation film and cover plate assembly hot melting, insulation film rubber coating and film coated cell discharging operations can be automatically completed. The existing hot scalding process is time-consuming, slow in cooling, easy to cause wire drawing, causes the laser welding point of the rear end to explode, is difficult to maintain in the later period and is time-consuming and laborious. SUMMARY

[0004] The technical problem to be solved by the application is how to improve the working efficiency and product quality of the film coating process of a lithium ion battery.

[0005] The application solves the above technical problems by the following technical means: a lithium ion battery insulation film feeding and welding device, which comprises a working turntable, a bending and wrapping mechanism, an insulation film feeding mechanism, an insulation film in-place detection mechanism, a cell feeding mechanism, a film pushing and welding mechanism, a welding quality detection mechanism and a discharging mechanism. The working turntable can rotate to drive the bending and wrapping mechanism to pass through the insulation film feeding mechanism, the insulation film in-place detection mechanism, the cell feeding mechanism, the film pushing and welding mechanism, the welding quality detection mechanism and the discharging mechanism in sequence.

[0006] The ultrasonic welding process is used for film coating of the battery cell, the time consumption is short, the working efficiency is high, the welding consistency is good, the welding appearance is perfect, the product quality is improved compared with the hot scalding process, the structure is simple, the equipment failure rate is low, the multi-station cooperation of the turntable improves the equipment utilization rate and production efficiency and the whole line production rhythm.

[0007] Preferably, the bending and wrapping mechanism comprises a support plate, a negative pressure plate, a bending plate and an air knife; an upper surface of the support plate is provided with an insulation film placement area, the negative pressure plate, the bending plate and the air knife are arranged in sequence along a length direction of the insulation film placement area; the negative pressure plate is provided with a plurality of air holes communicating with a negative pressure cavity inside the support plate, the negative pressure cavity is connected with a negative pressure air source; the bending plate penetrates through the support plate, a bending air cylinder installed below the support plate can drive the bending plate to lift and fall; the air knife is connected with a positive pressure air source. The negative pressure plate, the bending plate and the air knife are cooperated to bend and wrap the insulation film, which is simple and effective and will not damage the insulation film.

[0008] Preferably, the film pushing and welding mechanism comprises a film pushing mechanism, a light striking mechanism, a film pushing detection mechanism and a welding mechanism; the film pushing mechanism can push the part of the insulation film above the battery cell to make it fully spread on the upper surface of the battery cell; the light striking mechanism can strike light on the battery cell; the film pushing detection mechanism can detect the distance between the edge of the part of the insulation film above the battery cell and the upper edge of the cover plate of the battery cell through machine vision; the welding mechanism can weld the insulation film on the upper and lower surfaces of the battery cell.

[0009] Preferably, the film pushing mechanism comprises a film pushing servo module, a first lifting air cylinder, a connecting plate and a push rod; the first lifting air cylinder is installed at a moving end of the film pushing servo module, a cylinder push head of the first lifting air cylinder is fixedly connected with the connecting plate, and the push rod is rotatably connected with the connecting plate. The servo module can slowly push the insulation film to prevent scratching the insulation film or the battery cell diaphragm due to excessive force.

[0010] Preferably, the light striking mechanism comprises a vertical support rod, a support seat, a horizontal support rod and a light source; the support seat is rotatably installed at a middle section of the vertical support rod, the horizontal support rod is rotatably installed on the support seat, and the light source is installed on the horizontal support rod.

[0011] Preferably, the welding mechanism comprises a working base, a first mounting seat, a second mounting seat, a second lifting air cylinder, an ultrasonic welding assembly and an ultrasonic generator; the first mounting seat is installed on the working base, the second mounting seat is located above the first mounting seat, and the second lifting air cylinder can drive the second mounting seat to lift and fall; the first mounting seat and the second mounting seat are both provided with the ultrasonic welding assembly, the ultrasonic welding assembly comprises a transducer, an amplitude modulator and a welding head connected in sequence, and the ultrasonic generator is connected with the transducer of each ultrasonic welding assembly.

[0012] Preferably, opposite sides of the welding head are respectively provided with welding tooth mounting plates, an outer side surface of each welding tooth mounting plate is fixedly connected with a plurality of welding tooth arrays arranged in a row, and each group of welding tooth arrays comprises a plurality of hemispherical welding teeth arranged in a square array.

[0013] Preferably, the insulation film feeding mechanism comprises a storage box, a fixed rod, a photoelectric detection device and an insulation film feeding manipulator; the fixed rod is installed in the middle position of the inner cavity of the storage box, and the detection probe of the photoelectric detection device corresponds to the bottom of the inner cavity of the storage box; the insulation film feeding manipulator comprises a translation servo module, a lifting servo module and a material taking head, the movement route of the translation servo module passes through the storage box and the insulation film feeding station, the lifting servo module is installed at the movement end of the translation servo module, the material taking head is installed at the movement end of the lifting servo module, and the material taking head is connected with a negative pressure gas source.

[0014] Preferably, the cell feeding mechanism comprises a cell feeding conveying line and a cell feeding manipulator, the cell feeding manipulator can transport the cell on the cell feeding conveying line to the bending and wrapping mechanism located at the cell feeding station; the discharging mechanism comprises a discharging conveying line, a discharging manipulator and an NG station, the discharging manipulator can transport the film-wrapped cell located at the discharging station to the discharging conveying line or the NG station.

[0015] The lithium ion battery insulation film feeding and welding method adopts the lithium ion battery insulation film feeding and welding device, and comprises the following steps:

[0016] S01, the working turntable drives the bending and wrapping mechanism to rotate to the insulation film feeding station, and the insulation film feeding mechanism transports an insulation film to the bending and wrapping mechanism;

[0017] S02, after the insulation film feeding is completed, the working turntable drives the bending and wrapping mechanism to rotate to the insulation film position detection station, and the insulation film position detection mechanism starts to detect whether the bending and wrapping mechanism has the insulation film, if yes, the working turntable drives the bending and wrapping mechanism with the insulation film to rotate to the cell feeding station; if not, the rear-end process is not executed, and the working turntable drives the bending and wrapping mechanism to rotate back to the insulation film feeding station;

[0018] S03, after the bending and wrapping mechanism with the insulation film reaches the cell feeding station, the cell feeding mechanism transports the cell to be film-wrapped to the bending and wrapping mechanism, and the lower surface of the cell contacts and covers the insulation film;

[0019] S04, after the cell feeding is completed, the working turntable drives the bending and wrapping mechanism to rotate to the film pushing and welding station, the bending and wrapping mechanism bends the insulation film, and the film pushing and welding mechanism covers the insulation film on the upper surface of the cell;

[0020] S05, after the film pushing is completed, the film pushing and welding mechanism welds the insulation film on the upper edge and the lower edge of the cover plate of the cell;

[0021] S06, after the welding is completed, the working turntable drives the bending and wrapping mechanism to rotate to the welding quality detection station, and the welding quality detection mechanism judges whether the welding quality is qualified;

[0022] S07, after the welding quality detection is completed, the work turntable drives the bending wrapping mechanism to rotate to the discharging station, the discharging mechanism executes the command according to the welding quality detection result, if qualified, the film-wrapped battery cell enters the next process, if unqualified, the waste is discharged.

[0023] The present application has the advantages of:

[0024] 1. The ultrasonic welding process is used for film wrapping of the battery cell, time consumption is short, work efficiency is high, welding consistency is good, welding appearance is perfect, product quality is improved, the structure is simple, equipment failure rate is low, the multi-station cooperation of the turntable improves equipment utilization rate and production efficiency, and the whole line production rhythm is improved.

[0025] 2. The negative pressure plate, the bending plate and the air knife are used to cooperate to bend and wrap the insulating film, which is simple and effective and will not damage the insulating film.

[0026] 3. The servo module is used to slowly push the insulating film, so as to prevent the insulating film or the battery cell diaphragm from being scratched due to excessive force.

[0027] 4. The machine is used to detect the key control points, so as to prevent defective products from flowing into the rear end and further improve the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic view of the lithium ion battery insulating film feeding and welding device of the embodiment of the present application.

[0029] Figure 2 It is a structural schematic view of the insulating film of the embodiment of the present application.

[0030] Figure 3 It is a schematic view of the bending plate rising state in the overall structure of the bending wrapping mechanism of the embodiment of the present application.

[0031] Figure 4 It is a schematic view of the bending plate descending state in the local structure of the bending wrapping mechanism of the embodiment of the present application.

[0032] Figure 5 It is a structural schematic view of the insulating film feeding mechanism of the embodiment of the present application.

[0033] Figure 6 It is a structural schematic view of the insulating film in-place detection mechanism of the embodiment of the present application.

[0034] Figure 7 It is a structural schematic view of the film pushing and welding mechanism of the embodiment of the present application.

[0035] Figure 8 It is a structural schematic view of the film pushing mechanism of the embodiment of the present application.

[0036] Figure 9The structure schematic view of the light mechanism of the embodiment of the present application.

[0037] Figure 10 The structure schematic view of the welding mechanism of the embodiment of the present application.

[0038] Figure 11 The structure schematic view of the inside of the working base of the welding mechanism of the embodiment of the present application.

[0039] Figure 12 The structure schematic view of the ultrasonic welding assembly of the embodiment of the present application.

[0040] Figure 13 The structure schematic view of the welding quality detection mechanism of the embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiment of the present application more clear, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiment of the present application, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the present application.

[0042] As shown in Figure 1 The present application discloses a lithium ion battery insulation film feeding and welding device, which comprises a working turntable 1, a bending and wrapping mechanism 2, an insulation film feeding mechanism 3, an insulation film in-place detection mechanism 4, a battery cell feeding mechanism 5, a film pushing and welding mechanism 6, a welding quality detection mechanism 7 and a discharging mechanism 8.

[0043] The six bending and wrapping mechanisms 2 are fixedly connected at equal intervals on the edge of the working turntable 1. The working turntable 1 can rotate to drive the bending and wrapping mechanisms 2 to pass through the insulation film feeding mechanism 3, the insulation film in-place detection mechanism 4, the battery cell feeding mechanism 5, the film pushing and welding mechanism 6, the welding quality detection mechanism 7 and the discharging mechanism 8 in turn which are arranged around the outer ring of the working turntable 1. The bending and wrapping mechanisms 2 have six working positions with the rotating position of the working turntable 1, which are an insulation film feeding working position corresponding to the insulation film feeding mechanism 3, an insulation film in-place detection working position corresponding to the insulation film in-place detection mechanism 4, a battery cell feeding working position corresponding to the battery cell feeding mechanism 5, a film pushing and welding working position corresponding to the film pushing and welding mechanism 6, a welding quality detection working position corresponding to the welding quality detection mechanism 7 and a discharging working position corresponding to the discharging mechanism 8.

[0044] As shown in Figure 2As shown, the insulation film 9 includes a first side plate film 91, a bottom plate film 92 and a second side plate film 93 connected in sequence, two through holes 94 are arranged on the bottom plate film 92, and folding lines 95 are arranged between the first side plate film 91 and the bottom plate film 92 and between the bottom plate film 92 and the second side plate film 93; the two surfaces of the insulation film 9 are flat and have the same height.

[0045] As shown in the accompanying drawings, Figure 3 , Figure 4 As shown, the bending and wrapping mechanism 2 includes a support plate 21, a negative pressure plate 22, a bending plate 23, an air knife 24, a bending cylinder (not shown in the figure), and a limiting structure 25; an insulation film placing area is arranged on the upper surface of the support plate 21, the negative pressure plate 22, the bending plate 23 and the air knife 24 are arranged in sequence along the length direction of the insulation film placing area, and the limiting structure 25 is arranged around the insulation film placing area; the negative pressure plate 22 is made of stainless steel plate, and the shape and size thereof are matched with the first side plate film 91 of the insulation film 9; a plurality of air holes are arranged on the negative pressure plate 22 and connected with the internal negative pressure cavity of the support plate 21, and the negative pressure cavity is connected with a negative pressure air source; the bending plate 23 penetrates through the support plate 21, and the bending cylinder installed below the support plate 21 can drive the bending plate 23 to ascend and descend; the air knife 24 is connected with a positive pressure air source; after the insulation film 9 and the battery cell 10 are fed, the negative pressure plate 22 starts negative pressure to suck and fix the first side plate film 91, the bending plate 23 ascends to bend the bottom plate film 92 upward by 90° along the folding line 95, the bottom plate film 92 contacts the bottom plate of the battery cell 10 after bending, and the air knife 24 blows positive pressure airflow to lift the second side plate film 93 above the battery cell 10.

[0046] As shown in the accompanying drawings, Figure 5 As shown, the insulation film feeding mechanism 3 includes a storage box 31, a fixed rod 32, a photoelectric detection device 33, and an insulation film feeding manipulator 34; the storage box 31 is placed on one side of the work turntable 1, and the inner cavity thereof is used for placing the insulation film 9; two vertical fixed rods 32 are installed at the middle position of the inner cavity of the storage box 31 and correspond to the two through holes 94 of the insulation film 9, and the fixed rods 32 penetrate through the through holes 94 when the insulation film 9 is stacked in the storage box 31; the photoelectric detection device 33 is fixedly connected to the storage box 31, the detection probe thereof corresponds to the bottom of the inner cavity of the storage box 31, and is used for detecting whether there is material; the insulation film feeding manipulator 34 includes a translation servo module 341, a lifting servo module 342, and a material taking head 343, the movement route of the translation servo module 341 passes through the storage box 31 and the insulation film feeding station, the lifting servo module 342 is installed at the movement end of the translation servo module 341, the material taking head 343 is installed at the movement end of the lifting servo module 342, and the insulation film feeding manipulator 34 can transport the insulation film 9 in the storage box 31 to the bending and wrapping mechanism 2 at the insulation film feeding station; the material taking head 343 adopts two groups of rubber air nozzles and is connected with a negative pressure air source, and the material taking head 343 starts negative pressure to suck the insulation film 9 from the position of the bottom plate film 92 when taking material.

[0047] AsFigure 6 As shown in the figure, the insulation film in place detection mechanism 4 includes a first bracket 41, a first CCD camera 42 mounted at the upper end of the first bracket 42, which can detect whether the bending and wrapping mechanism 2 at the insulation film in place detection station has material through machine vision.

[0048] As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1. Figure 1 As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1.

[0049] Figure 7 As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1.

[0050] As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1. Figure 8 As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1.

[0051] As shown in the figure, the cell loading mechanism 5 includes a cell loading conveying line 51 and a cell loading manipulator 52; the cell loading conveying line 51 is placed on one side of the work turntable 1, used to transport the cell 10 after the cover plate welding and before the film wrapping; the cell loading manipulator 52 can transport the cell 10 on the cell loading conveying line 51 to the bending and wrapping mechanism 2 at the cell loading station, and after loading, the upper surface and the lower surface of the cell 10 are two opposite side plates respectively, the cover plate faces the outer circle of the work turntable 1, and the bottom plate faces the center of the work turntable 1. Figure 9 ​As shown, the lighting mechanism 62 includes a vertical support rod 621, a support seat 622, a horizontal support rod 623, a light source 624, the support seat 622 is rotatably installed on the middle section of the vertical support rod 621, the horizontal support rod 623 is rotatably installed on the support seat 622, and the light source 624 is installed on the horizontal support rod 623; by rotating the support seat 622 around the vertical support rod 621 and rotating the horizontal support rod 623 around the support seat 622, the direction of the light source can be adjusted.

[0052] As shown in the figure, Figures 10 to 12 As shown, the welding mechanism 64 includes a working base 641, a first mounting seat 642, a second mounting seat 643, a second lifting cylinder 644, an ultrasonic welding assembly 645, and an ultrasonic generator (not shown in the figure).

[0053] The working base 641 includes a base bottom plate 6411, a base top plate 6412, and a guide rod 6413, the base bottom plate 6411 is located above the base top plate 6412, and the guide rod 6413 is fixedly connected between the base bottom plate 6411 and the base top plate 6412; the first mounting seat 642 is installed on the base bottom plate 6411, the second mounting seat 643 is in sliding fit with the guide rod 6413 and is located above the first mounting seat 642; the second lifting cylinder 644 is installed on the base top plate 6412, the cylinder push head thereof is fixedly connected with the second mounting seat 643, and the second mounting seat 643 can be lifted along the guide rod 6413; the ultrasonic welding assembly 645 is installed on each of the first mounting seat 642 and the second mounting seat 643, the ultrasonic welding assembly 645 includes a transducer 6451, an amplitude modulator 6452, and a welding head 6453 connected in sequence by bolts, the welding head 6453 extends outside the working base 641 and contacts with a welding piece; the ultrasonic generator is connected with the transducers 6451 of the ultrasonic welding assemblies 645 through a cable, and can convert high-frequency electric energy into ultrasonic wave energy.

[0054] The length of the welding head 6453 is half a wavelength, the welding frequency is 20Khz, the welding time is 0.1-0.2s, and the welding energy is 1KW; opposite sides of the welding head 6453 are respectively provided with a welding tooth mounting plate, which can improve the utilization rate of the welding head 6453; the outer side of each welding tooth mounting plate is fixedly connected with 3 groups of welding tooth arrays arranged in a row, each group of welding tooth arrays includes 9 hemispherical welding teeth arranged in a 3*3 square array, and the welding teeth are hemispherical, which can significantly improve the welding yield; the height from the root of the welding tooth to the top of the tooth is 2cm, and in the initial state, the top of the lower welding head 6453 is spaced apart from the lower surface of the first side plate film 91 by 5mm, and the top of the upper welding head 6453 is spaced apart from the upper surface of the battery cell 10 by 5cm.

[0055] As shown in the figure, Figure 13As shown, the welding quality detection mechanism 7 includes a second bracket 71, a second CCD camera 72 and a third CCD camera 73, the second CCD camera 72 and the third CCD camera 73 are respectively installed at the upper end and the lower end of the second bracket 71, and can detect the welding marks of the insulating film 9 at the upper edge and the lower edge of the cover plate of the battery cell 10 by machine vision, so as to judge whether the welding quality is qualified.

[0056] As shown, Figure 1 As shown, the blanking mechanism 8 includes a blanking conveying line 81, a blanking manipulator 82 and an NG station (not shown), the blanking conveying line 81 and the NG station are respectively placed at one side of the work turntable 1, the blanking conveying line 81 is used for conveying the film-coated battery cell 10, the NG station is used for storing unqualified products, and the blanking manipulator 82 can transport the film-coated battery cell 10 located at the blanking station to the blanking conveying line 81 or the NG station.

[0057] The work turntable 1, the bending and wrapping mechanism 2, the insulating film feeding mechanism 3, the insulating film in-place detection mechanism 4, the battery cell feeding mechanism 5, the film pushing and welding mechanism 6, the welding quality detection mechanism 7 and the blanking mechanism 8 are all connected with the PLC, the lithium ion battery insulating film feeding and welding device is controlled and executed by the PLC, manual intervention is not required, the production line efficiency is high, and the degree of automation is high.

[0058] The lithium ion battery insulating film feeding and welding method adopts the lithium ion battery insulating film feeding and welding device and includes the following steps.

[0059] S01, the work turntable 1 drives the bending and wrapping mechanism 2 to rotate to the insulating film feeding station, after the photoelectric detection device 33 detects that the storage box 31 has the insulating film 9, the insulating film feeding manipulator 34 sucks the insulating film 9 from the storage box 31 and transports the insulating film 9 to the insulating film placing area of the bending and wrapping mechanism 2;

[0060] S02, after the insulating film feeding is completed, the work turntable 1 drives the bending and wrapping mechanism 2 to rotate to the insulating film in-place detection station, the first CCD camera 42 starts to detect whether the bending and wrapping mechanism 2 has the insulating film 9, if yes, the work turntable 1 drives the bending and wrapping mechanism 2, on which the insulating film 9 is placed, to rotate to the battery cell feeding station, if not, the rear-end process is not executed, the work turntable 1 rotates one circle and drives the bending and wrapping mechanism 2 to return to the insulating film feeding station again;

[0061] S03, after the bending and wrapping mechanism 2, on which the insulating film 9 is placed, reaches the battery cell feeding station, the battery cell feeding manipulator 52 transports the battery cell 10 to be film-coated on the battery cell feeding conveying line 51 to the bending and wrapping mechanism 2, the lower surface of the battery cell 10 contacts the first side plate mold 91 and is fully laid, and at the same time, the negative pressure plate 22 starts the negative pressure to suck and fix the first side plate mold 91;

[0062] S04, after the cell loading is completed, the working turntable 1 drives the bending and wrapping mechanism 2 to rotate to the film pushing and welding station, the bending cylinder works to drive the bending plate 23 to rise and bend the bottom plate film 92 upward by 90° along the folding line 95, and after the bending, the bottom plate film 92 contacts the bottom plate of the cell 10, and the air knife 24 blows out the positive pressure airflow to lift the second side plate film 93 above the cell 10; at this time, the first lifting cylinder 612 starts to work to drive the push rod 614 to press the lifted second side plate film 93 downward to the upper surface of the cell 10 along the folding line 95, and then the film pushing servo module 611 is started to drive the push rod 614 to push the second side plate film 93 to fully cover the upper surface of the cell 10; the film pushing detection mechanism 63 detects the distance between the edge of the second side plate film 93 and the upper edge of the cover plate of the cell 10 every time the film pushing is performed, and if it is qualified, the film pushing is completed, and if it is unqualified, the film pushing servo module 611 drives the push rod 614 to return to the starting position to continue the next film pushing;

[0063] S05, after the film pushing is completed, the second lifting cylinder 644 works to drive the second mounting seat 643 to descend, so that the insulating film 9 and the cover plate of the cell 10 are clamped by the welding heads of the two ultrasonic welding assemblies 645, at this time, the ultrasonic generator provides high-frequency current for the two ultrasonic welding assemblies 645, and the two welding heads rub the insulating film 9 at high frequency to weld the insulating film 9 on the plastic positions of the upper and lower edges of the cover plate of the cell 10;

[0064] S06, after the welding is completed, the working turntable 1 drives the bending and wrapping mechanism 2 to rotate to the welding quality detection station, and the second CCD camera 72 and the third CCD camera 73 detect the welding marks of the insulating film 9 on the upper and lower edges of the cover plate of the cell 10 to judge whether the welding quality is qualified;

[0065] S07, after the welding quality detection is completed, the working turntable 1 drives the bending and wrapping mechanism 2 to rotate to the discharging station, and the discharging manipulator 82 executes the command according to the welding quality detection result, if it is qualified, the discharging manipulator 82 transports the film-wrapped cell to the discharging conveying line 81 to make it enter the next process, and if it is unqualified, the discharging manipulator 82 transports the film-wrapped cell to the NG station for waste disposal.

[0066] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium ion battery insulation film feeding and welding device, characterized in that: The working turntable, the bending and wrapping mechanism, the insulation film feeding mechanism, the insulation film in-place detection mechanism, the battery cell feeding mechanism, the film pushing and welding mechanism, the welding quality detection mechanism and the discharging mechanism, the working turntable can rotate to drive the bending and wrapping mechanism to pass through the insulation film feeding mechanism, the insulation film in-place detection mechanism, the battery cell feeding mechanism, the film pushing and welding mechanism, the welding quality detection mechanism and the discharging mechanism in turn; the bending and wrapping mechanism comprises a support plate, a negative pressure plate, a bending plate and an air knife; the upper surface of the support plate is provided with an insulation film placement area, and the negative pressure plate, the bending plate and the air knife are arranged in the length direction of the insulation film placement area in turn; a plurality of air holes communicating with the negative pressure cavities inside the support plate are arranged on the negative pressure plate, and the negative pressure cavities are connected with a negative pressure air source; the bending plate passes through the support plate, and a bending cylinder installed below the support plate can drive the bending plate to lift and fall; the air knife is connected with a positive pressure air source; the film pushing and welding mechanism comprises a film pushing mechanism, the film pushing mechanism pushes the part of the insulation film above the battery cell, and the film pushing mechanism comprises a film pushing servo module, a first lifting cylinder, a connecting plate and a push rod; the first lifting cylinder is installed at the moving end of the film pushing servo module, the cylinder push head of the first lifting cylinder is fixedly connected with the connecting plate, and the push rod is rotatably connected with the connecting plate; the insulation film comprises a first side plate film, a bottom plate film and a second side plate film connected in turn, two through holes are arranged on the bottom plate film, folding lines are arranged between the first side plate film and the bottom plate film and between the bottom plate film and the second side plate film, and the two surfaces of the insulation film are flat and consistent in height; after the insulation film and the battery cell are fed, the negative pressure plate starts negative pressure to suck and fix the first side plate film, the bending plate rises to bend the bottom plate film upward by 90° along the folding line, the bottom plate film contacts the bottom plate of the battery cell after being bent, the air knife blows positive pressure airflow to lift the second side plate film above the battery cell, the first lifting cylinder drives the push rod to press the lifted second side plate film downward to the upper surface of the battery cell along the folding line, and the film pushing servo module drives the push rod to push the second side plate film to make the second side plate film fully cover the upper surface of the battery cell.

2. The lithium ion battery insulation film on-load welding device of claim 1, wherein: The film pushing and welding mechanism further comprises a light striking mechanism, a film pushing detection mechanism and a welding mechanism; the light striking mechanism can strike light on the battery cell; the film pushing detection mechanism can detect the distance between the edge of the part of the insulation film above the battery cell and the upper edge of the cover plate of the battery cell through machine vision; and the welding mechanism can weld the insulation film on the upper surface and the lower surface of the battery cell.

3. The lithium ion battery insulation film on-load welding device of claim 2, wherein: The light striking mechanism comprises a vertical support rod, a support seat, a horizontal support rod and a light source, the support seat is rotatably installed at the middle segment of the vertical support rod, the horizontal support rod is rotatably installed on the support seat, and the light source is installed on the horizontal support rod.

4. The lithium ion battery insulation film on-load welding device of claim 2, wherein: The welding mechanism comprises a working base, a first mounting seat, a second mounting seat, a second lifting cylinder, an ultrasonic welding assembly and an ultrasonic generator; the first mounting seat is installed on the working base, the second mounting seat is located above the first mounting seat, and the second lifting cylinder can drive the second mounting seat to lift and fall; the first mounting seat and the second mounting seat are both provided with the ultrasonic welding assembly, the ultrasonic welding assembly comprises a transducer, an amplitude modulator and a welding head connected in turn, and the ultrasonic generator is connected with the transducers of the ultrasonic welding assemblies.

5. The lithium ion battery insulation film on-load welding device of claim 4, wherein: The opposite sides of the welding head are respectively provided with welding tooth mounting plates, the outer side of each welding tooth mounting plate is fixedly connected with a plurality of welding tooth arrays arranged in a row, and each welding tooth array includes a plurality of square array arranged hemispherical welding teeth.

6. The lithium ion battery insulation film on-load welding device of claim 1, wherein: The insulation film loading mechanism includes a storage box, a fixed rod, a photoelectric detection device, and an insulation film loading manipulator; the fixed rod is installed at the middle position of the inner cavity of the storage box, and the detection probe of the photoelectric detection device corresponds to the bottom of the inner cavity of the storage box; the insulation film loading manipulator includes a translation servo module, a lifting servo module, and a material taking head, the movement route of the translation servo module passes through the storage box and the insulation film loading station, the lifting servo module is installed at the movement end of the translation servo module, the material taking head is installed at the movement end of the lifting servo module, and the material taking head is connected with a negative pressure air source.

7. The lithium-ion battery insulation film on-load welding device of claim 1, wherein: The electric core loading mechanism includes an electric core loading conveying line and an electric core loading manipulator, the electric core loading manipulator can transport the electric core on the electric core loading conveying line to the bending and wrapping mechanism located at the electric core loading station; the discharging mechanism includes a discharging conveying line, a discharging manipulator, and an NG station, and the discharging manipulator can transport the film-wrapped electric core located at the discharging station to the discharging conveying line or the NG station.

8. The lithium ion battery insulation film on-load welding device of claim 1, wherein: The insulation film in-place detection mechanism includes a first bracket and a first CCD camera, and the first CCD camera is installed at the upper end of the first bracket.

9. The lithium ion battery insulation film on-load welding device of claim 1, wherein: The welding quality detection mechanism includes a second bracket, a second CCD camera, and a third CCD camera, and the second CCD camera and the third CCD camera are respectively installed at the upper end and the lower end of the second bracket.

10. A method for welding a lithium ion battery insulation film, characterized by: The lithium ion battery insulation film loading and welding device adopts any one of claims 1-9, including the following steps: S01, the working turntable drives the bending and wrapping mechanism to rotate to the insulation film loading station, and the insulation film loading mechanism transports an insulation film to the bending and wrapping mechanism; S02, after the insulation film loading is completed, the working turntable drives the bending and wrapping mechanism to rotate to the insulation film in-place detection station, and the insulation film in-place detection mechanism starts to detect whether the bending and wrapping mechanism has material, if yes, the working turntable drives the bending and wrapping mechanism with the insulation film to rotate to the electric core loading station, if not, the rear-end process is not executed, and the working turntable drives the bending and wrapping mechanism to return to the insulation film loading station again; S03, after the bending and wrapping mechanism with the insulation film reaches the electric core loading station, the electric core loading mechanism transports the electric core to be film-wrapped to the bending and wrapping mechanism, and the lower surface of the electric core contacts and covers the insulation film; S04, after the electric core loading is completed, the working turntable drives the bending and wrapping mechanism to rotate to the film pushing and welding station, the bending and wrapping mechanism bends the insulation film, and the film pushing and welding mechanism covers the insulation film on the upper surface of the electric core; S05, after the film pushing is completed, the film pushing and welding mechanism welds the insulation film on the upper edge and the lower edge of the cover plate of the electric core; S06, after the welding is completed, the working turntable drives the bending and wrapping mechanism to rotate to the welding quality detection station, and the welding quality detection mechanism judges whether the welding quality is qualified; S07, after the welding quality detection is completed, the work turntable drives the bending wrapping mechanism to rotate to the discharging station, the discharging mechanism executes the command according to the welding quality detection result, if qualified, the film-wrapped battery cell enters the next process, if unqualified, the waste is discharged.

Images