Welding equipment for integrated cover plate of lithium battery module

Abstract

The utility model discloses a welding device for a lithium battery module integrated cover plate, which comprises a device bottom frame, a lower layer mechanism, a middle layer mechanism, an upper layer mechanism and an outer cover, the lower layer mechanism comprises a module conveying and jacking mechanism, the upper layer mechanism comprises a galvanometer mechanism, the middle layer mechanism comprises two pressing mechanisms which are symmetrically arranged, and the outer cover is arranged on the upper layer mechanism. Each pressing mechanism comprises an X-axis linear module 1, an X-axis servo motor, an X-axis transmission rod 3, a Y-axis linear module, a Z-axis mounting plate, a pressing assembly and an X-axis mounting plate; the two X-axis linear modules are arranged left and right and connected through the X-axis transmission rod, and the X-axis servo motor is installed in the middle of the X-axis transmission rod. The two ends of the X-axis mounting plate are connected with the left X-axis linear module and the right X-axis linear module, and the Y-axis linear module is mounted on the X-axis mounting plate. The Z-axis mounting plate is connected with the Y-axis linear module, and the pressing assembly is connected with the Z-axis mounting plate and moves up and down along the Z axis. The side-by-side welding device can meet the requirement for side-by-side welding of battery modules with small pole space.

Description

Technical Field

[0001] The utility model relates to welding equipment for lithium battery modules in automobile power batteries, belonging to the field of machinery. Background Art

[0002] With the increasing demand for new energy electric vehicles, how to improve vehicle quality and extend vehicle service life has become an urgent problem for automakers. Among them, the power battery is the "heart" of electric vehicles, and its quality directly affects the life of electric vehicles.

[0003] Power batteries usually include cylindrical batteries, square batteries, blade batteries, etc. Among them: After cylindrical batteries and square batteries are integrated into battery modules, it is necessary to weld an integrated cover plate on the battery module, that is, to weld the aluminum sheet on the integrated cover plate to the battery pole using a laser welding process, such as Fig.13 shown.

[0004] The disadvantages of the existing welding equipment are: 1. The pressure head structure of the welding station is large, and modules with a small pole spacing cannot be welded side by side; 2. The pressure head cleaning mechanism has only one brush, the dust removal efficiency is low, and the model change is troublesome. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a welding device for an integrated cover plate of a lithium battery module, which can meet the requirements of side-by-side welding of battery modules with a small pole spacing. At the same time, it can compensate for the height difference, thereby reliably pressing the integrated cover plate. In addition, it can efficiently remove slag dust inside and on the end surface of the pressing device, thereby reliably pressing the integrated cover plate. Therefore, the welding device of the utility model can well ensure the welding quality and expand its scope of application.

[0006] The utility model discloses a welding device for an integrated cover plate of a lithium battery module, which comprises a device bottom frame, a lower mechanism, a middle mechanism, an upper mechanism and an outer cover: the lower mechanism comprises a module transport and jacking mechanism, the upper mechanism comprises a galvanometer mechanism, the middle mechanism comprises two symmetrically arranged clamping mechanisms, each clamping mechanism comprises an X-axis linear module, an X-axis servo motor, an X-axis transmission rod, a Y-axis linear module, a Z-axis mounting plate, a clamping assembly and an X-axis mounting plate; the two X-axis linear modules are arranged on the left and right sides and connected by the X-axis transmission rod, and the X-axis servo motor is installed in the middle of the X-axis transmission rod; the two ends of the X-axis mounting plate are connected to the left and right X-axis linear modules, and the Y-axis linear module is installed on the X-axis mounting plate; the Z-axis mounting plate is connected to the Y-axis linear module, and the clamping assembly is connected to the Z-axis mounting plate and moves up and down along the Z-axis.

[0007] Furthermore, the clamping assembly includes a ram assembly mounting plate, a Z-axis cylinder, a floating joint, a ram assembly, and two linear guides; the Z-axis cylinder is fixed on the Z-axis mounting plate, and its lower part is connected to the ram assembly mounting plate through a floating joint, and the ram assembly is connected to the bottom of the ram assembly mounting plate; the two linear guides are fixed on the left and right ends of the front of the Z-axis mounting plate, and the left and right ends of the rear of the ram assembly mounting plate are connected to the linear guides.

[0008] Furthermore, the clamping assembly also includes a buffer unit, which includes a hydraulic buffer and a buffer bumper. The hydraulic buffer is arranged at the lower part of the Z-axis mounting plate, and the buffer bumper is arranged on the side of the pressure head assembly mounting plate.

[0009] Furthermore, the clamping assembly also includes a height measuring unit, which includes a distance measuring sensor and a distance measuring sensor cylinder. The distance measuring sensor cylinder is fixed in front of the Z-axis mounting plate, and the distance measuring sensor is connected to the distance measuring sensor cylinder.

[0010] Furthermore, the pressure head assembly includes a copper nozzle mounting plate, four groups of pressure head units, each pressure head unit includes a guide rod I, an upper copper nozzle, an air inlet joint, a dust removal duct, and a lower copper nozzle; the copper nozzle mounting plate is fixed under the pressure head assembly mounting plate, and the guide rod I passes through the copper nozzle mounting plate and is connected to the upper copper nozzle, and the upper copper nozzle is connected to the lower copper nozzle; an annular groove is provided on the upper plane of the lower copper nozzle, and a circle of blowing holes are arranged in the annular groove, and the blowing holes are inclined and their lower ends open on the inner wall of the lower copper nozzle; an L-shaped air inlet hole is provided at the lower part of the upper copper nozzle, and the air inlet end of the air inlet hole opens to the outer wall of the upper copper nozzle and is connected to the air inlet joint, and its air outlet end is connected to the annular groove of the lower copper nozzle; the dust removal duct is connected to the side hole of the upper copper nozzle.

[0011] Furthermore, there are preferably two guide rods I; the upper copper nozzle is a special-shaped part, one diagonal of the square is milled into a bevel, and the other diagonal is respectively connected to a guide rod I; the non-milled corner of the upper copper nozzle extends into the milled corner of the adjacent upper copper nozzle.

[0012] Furthermore, the upper mechanism also includes a pressure head cleaning mechanism, which includes a mechanism mounting frame, a lifting cylinder, a brush assembly mounting plate, four linear bearings, four guide rods II, a connecting plate I, and a brush assembly; the mechanism mounting frame is connected to the welding head X-axis assembly in the galvanometer mechanism, and the connecting plate I and the brush assembly mounting plate are respectively located above and below the mechanism mounting frame; the lifting cylinder is fixed on the upper part of the mechanism mounting frame, and the four linear bearings are fixed on the upper part of the mechanism mounting frame and are evenly distributed with the lifting cylinder as the center, the guide rod II passes through the linear bearing, and its upper and lower ends are respectively connected to the connecting plate I and the brush assembly mounting plate; the brush assembly is connected to the brush assembly mounting plate.

[0013] Furthermore, the pressure head cleaning mechanism also includes a guide rod support and a guide rod mounting seat. The guide rod support is fixed under the connecting plate I, and the guide rod mounting seat is fixed on the brush assembly mounting plate. The upper end of the guide rod II is connected to the guide rod support through a thread, and the lower end is connected to the guide rod mounting seat.

[0014] Furthermore, the brush assembly includes a connecting plate II, a synchronous belt, a stepper motor, a driving shaft, an active synchronous wheel, multiple bearings, and four brush units. The upper plate of the connecting plate II is fixedly connected to the bottom of the brush assembly mounting plate, and the lower plate thereof is equipped with multiple bearings; the stepper motor is fixed on the top of the brush assembly mounting plate, the upper end of the active shaft is connected to the stepper motor through a coupling, and the lower end is connected to the connecting plate II through a bearing, and the active synchronous wheel is installed on the active shaft; each brush unit is connected to the connecting plate II through a bearing; the synchronous belt connects the active synchronous wheel and the brush unit.

[0015] Furthermore, each brush unit includes a driven shaft, a driven synchronous wheel, and a brush; the driven shaft is connected to the connecting plate II through a bearing, the upper end of which is covered with a driven synchronous wheel and the lower end of which is connected to the brush; the synchronous belt connects the active synchronous wheel and the driven synchronous wheel.

[0016] The advantages of the welding equipment of the utility model are: 1. The special-shaped part of the upper copper nozzle makes the spacing between adjacent clamping units smaller, so as to meet the needs of side-by-side welding of battery modules with smaller pole spacing, and can weld four adjacent front, back, left and right batteries at once, and then move to the next welding position; avoid the possibility of the clamping device damaging the welded position when the interval welding is performed due to the large spacing between adjacent units; 2. When the clamping assembly is pressed down as a whole, the lower copper nozzle contacts the welding surface, and the spring is compressed to provide clamping force: in this way, even if the welding surface height is inconsistent, the spring can provide clamping force to each copper nozzle while compensating for the height difference to ensure the quality of welding; 3. When the welding is completed, the lifting cylinder drives multiple brushes to enter the inner hole of the copper nozzle, and at the same time, the stepping motor drives the brush to rotate and clean the pressure head, remove the welding slag and dust inside and on the end face of the copper nozzle, so that the copper nozzle can reliably clamp the integrated cover plate; 4. The pressure head assembly and the brush assembly can be replaced according to the model of the battery module. Therefore, the welding equipment of the utility model can well ensure the welding quality and expand its scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the welding equipment of the utility model;

[0018] Figure 2 It is a schematic diagram of the positions of the pressure head cleaning mechanism and the pressing mechanism in the welding equipment of the utility model;

[0019] Figure 3 It is a three-dimensional diagram of the clamping mechanism;

[0020] Figure 4It is the front view of the clamping mechanism;

[0021] Figure 5 is a stereogram of the clamping assembly;

[0022] Figure 6 is a stereogram of the pressure head assembly;

[0023] Figure 7 It is an exploded view of the pressure head assembly;

[0024] Figure 8 It is a schematic diagram of the upper and lower copper nozzles;

[0025] Fig. 9 is a bottom view of the pressure head assembly;

[0026] Fig.10 It is a three-dimensional diagram of the pressure head cleaning mechanism;

[0027] Fig.11 is a stereogram of a brush assembly;

[0028] Fig.12 is a schematic diagram of the brush assembly cleaning the pressing mechanism;

[0029] Fig.13 It is a schematic diagram of the welding of the integrated cover plate and the battery pole. DETAILED DESCRIPTION

[0030] Example 1

[0031] from Figure 1 , Figure 2 , Figure 3 , Figure 4 It can be seen that the utility model is a welding device for an integrated cover plate of a lithium battery module, which includes an equipment bottom frame 11, a lower mechanism 12, a middle mechanism 13, an upper mechanism 14, and an outer cover 15: the lower mechanism 12 includes a module transport and lifting mechanism, the upper mechanism 14 includes a galvanometer mechanism, and the middle mechanism 13 includes two symmetrically arranged clamping mechanisms, each of which includes an X-axis linear module 1, an X-axis servo motor 2, an X-axis transmission rod 3, a Y-axis linear module 4, a Z-axis mounting plate 6, a clamping assembly 7, and an X-axis mounting plate 8; the two X-axis linear modules 1 are arranged on the left and right and connected by the X-axis transmission rod 3, and the X-axis servo motor 2 is installed in the middle of the X-axis transmission rod 3; the two ends of the X-axis mounting plate 8 are connected to the left and right X-axis linear modules 1, and the Y-axis linear module 4 is installed on the X-axis mounting plate 8; the Z-axis mounting plate 6 is connected to the Y-axis linear module 4, and the clamping assembly 7 is connected to the Z-axis mounting plate 6 and moves up and down along the Z-axis.

[0032] Each clamping mechanism 12 further includes a Y-axis linear guide 5, which is mounted on the X-axis mounting plate 8 and parallel to the Y-axis linear module 4, and the Z-axis mounting plate 6 is connected to the Y-axis linear guide 5. Because the clamping assembly 7 may be eccentric when moving on the Y-axis linear module 4 through the Z-axis mounting plate 6, a Y-axis linear guide 5 is added to assist in force.

[0033] The working principle of the clamping mechanism is: the X-axis servo motor 2 realizes the synchronous movement of the two X-axis linear modules 1 by driving the X-axis transmission rod 3, and the X-axis mounting plate 8 drives the parts thereon to realize movement along the X-axis; the Y-axis linear module 4 works, and the Z-axis mounting plate 6 drives the parts thereon to realize movement along the Y-axis; the clamping assembly 7 itself realizes movement along the Z-axis.

[0034] When welding is required, the clamping assembly 7 is first moved along the X-axis and Y-axis through the Z-axis mounting plate 6 to the position where welding is required, that is, above the integrated cover plate. The clamping assembly 7 then descends along the Z-axis to press the integrated cover plate onto the battery pole of the lower battery module, and then welding is performed through the upper welding mechanism.

[0035] Example 2

[0036] from Figure 3 , Figure 4 , Figure 5 It can be known that the welding equipment of the present invention: the clamping assembly 7 includes a ram assembly mounting plate 70, a Z-axis cylinder 71, a floating joint 74, a ram assembly 77, and two linear guide rails 78; the Z-axis cylinder 71 is fixed on the Z-axis mounting plate 6, and its lower part is connected to the ram assembly mounting plate 70 through the floating joint 74, and the ram assembly 77 is connected to the bottom of the ram assembly mounting plate 70; the two linear guide rails 78 are fixed to the left and right ends of the front of the Z-axis mounting plate 6, and the left and right ends of the rear of the ram assembly mounting plate 70 are connected to the linear guide rails 78.

[0037] The Z-axis cylinder 71 pushes the pressure head assembly mounting plate 70 to move up and down along the linear guide rail 78 through the floating joint 74, so that the pressure head assembly 77 moves up and down along the Z axis to achieve the compression of the integrated cover. Among them, the pressure head assembly 77 is a replaceable component, which can be replaced according to different battery modules to meet the requirements of product compatibility.

[0038] Example 3

[0039] from Figure 3 , Figure 4 , Figure 5 It can be known that the welding equipment of the present invention: the clamping assembly 7 also includes a buffer unit, the buffer unit includes a hydraulic buffer 79 and a buffer bumper 80, the hydraulic buffer 79 is arranged at the lower part of the Z-axis mounting plate 6, and the buffer bumper 80 is arranged on the side of the pressure head assembly mounting plate 70.

[0040] When the pressure head assembly mounting plate 70 moves downward, the buffer collision block 80 hits the oil pressure buffer 79, absorbing the impact force of the Z-axis cylinder 71, ensuring the accuracy of each part and further ensuring the welding quality.

[0041] Example 4

[0042] from Figure 3 , Figure 4 , Figure 5 It can be known that the welding equipment of the present invention: the clamping assembly 7 also includes a pressure sensor 75 , which is fixed on the top of the pressure head assembly mounting plate 70 and is located below the floating joint 74 .

[0043] Since there is a spring in the pressure head assembly 7, the Z-axis cylinder 71 is equipped with a precision pressure regulating valve to control the force output by the cylinder to be the same as the force of the spring compression, and the pressure sensor 75 is used to detect the value of the compression force.

[0044] Example 5

[0045] from Figure 3 , Figure 4 , Figure 5 It can be seen that the welding equipment of the present invention: the clamping assembly 7 also includes a height measuring unit, the height measuring unit includes a distance sensor 72 and a distance sensor cylinder 76, the distance sensor cylinder 76 is fixed in front of the Z-axis mounting plate 6, and the distance sensor 72 is connected to the distance sensor cylinder 76.

[0046] After the pressure head assembly 7 presses the integrated cover plate, it is necessary to measure the height value of the surface of the integrated cover plate to be welded: the distance sensor cylinder 76 drives the distance sensor 72 to extend forward, and the light of the distance sensor 72 passes through the pressure head assembly to measure the height value of the integrated cover plate to be welded.

[0047] Example 6

[0048] from Figure 3 , Figure 4 , Figure 5 It can be known that the height measurement unit of the welding equipment of the present invention further includes a distance sensor protection plate 73 , and the distance sensor protection plate 73 is fixed in front of the Z-axis cylinder 71 and is located below the distance sensor 72 .

[0049] When the distance sensor 72 completes the measurement, it retracts backwards following the distance sensor cylinder 76, and the distance sensor protection plate 73 just blocks the light-emitting surface of the distance sensor 72 to prevent the splash and smoke during welding from damaging the light-emitting surface of the distance sensor 72.

[0050] Example 7

[0051] from Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 It can be seen that the welding equipment of the utility model: the pressure head assembly 77 includes a copper nozzle mounting plate 771, four groups of pressure head units, each pressure head unit includes a guide rod Ⅰ 772, an upper copper nozzle 775, an air inlet joint 776, a dust removal duct 777, and a lower copper nozzle 779; the copper nozzle mounting plate 771 is fixed under the pressure head assembly mounting plate 70, the guide rod Ⅰ 772 passes through the copper nozzle mounting plate 771 and is connected to the upper copper nozzle 775, and the upper copper nozzle 775 is connected to the lower copper nozzle 77 9; An annular groove is provided on the upper plane of the lower copper nozzle 779, and a circle of blowing holes is arranged in the annular groove. The blowing holes are arranged obliquely, and the lower ends thereof open on the inner wall of the lower copper nozzle 779; An L-shaped air inlet hole is provided at the lower part of the upper copper nozzle 775, and the air inlet end of the air inlet hole opens on the outer wall of the upper copper nozzle 775 and is connected with the air inlet joint 776, and the air outlet end thereof is connected with the annular groove of the lower copper nozzle 779; The dust removal duct 777 is connected with the side hole of the upper copper nozzle 775.

[0052] When the Z-axis cylinder 71 pushes the pressure head assembly mounting plate 70 to move downward along the linear guide rail 78 through the floating joint 74, the pressure head assembly 77 also moves downward, causing the lower copper nozzle 779 to press the integrated cover plate.

[0053] Among them, a circle of blowing holes in the lower copper nozzle 779 allows the protective gas to be blown stably and evenly onto the welding surface.

[0054] After the integrated cover is pressed, the laser of the upper galvanometer mechanism reaches the integrated cover through the inner holes of the upper and lower copper nozzles for welding, and the protective gas reaches the surface of the integrated cover through the air inlet of the upper copper nozzle 775 and the air blowing hole of the lower copper nozzle 779 for gas protection; at the same time, the smoke generated during welding is sucked away through the dust removal pipe 777, and the four dust removal pipes 777 are merged into two pipes through the three-way pipe 770. In the utility model, the pressure head assembly 77 has four pressure head units, each of which has an independent dust removal pipe, a total of four dust removal pipes; these four dust removal pipes are first merged into two pipes, and then merged into a main pipe through the three-way pipe to suck away the smoke.

[0055] Example 8

[0056] from Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 It can be seen that the welding equipment of the present invention: there are preferably two guide rods Ⅰ772; the upper copper nozzle 775 is a special-shaped part, one diagonal of the square is milled into a bevel, and the other diagonal is respectively connected to a guide rod Ⅰ772; the non-milled corner of the upper copper nozzle 775 extends into the milled corner of the adjacent upper copper nozzle 775.

[0057] The advantages of the upper copper nozzle 775 special-shaped part are: 1. Two guide rods Ⅰ772 are set at one diagonal to ensure the reliability of the connection; 2. One diagonal is milled into a bevel, so that the spacing between adjacent clamping units becomes smaller, thereby meeting the needs of side-by-side welding of battery modules with smaller pole spacing, and the four adjacent front, rear, left and right batteries can be welded at once, and then move to the next welding position; avoiding the possibility of the clamping device damaging the welded position when performing interval welding due to the large spacing between adjacent units.

[0058] Example 9

[0059] from Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 It can be seen that, in the welding equipment of the present invention: each pressure head unit also includes a spring 774, which is sleeved on the outside of the guide rod Ⅰ 772 and is located between the copper nozzle mounting plate 771 and the upper copper nozzle 775.

[0060] When the clamping device is pressed down as a whole, the lower copper nozzle 779 contacts the welding surface, and the spring 774 is compressed to provide clamping force: even if the welding surface height is inconsistent, the spring 774 can provide clamping force to each copper nozzle 779 and compensate for the height difference to ensure the quality of welding. The number of springs 774 is the same as the number of guide rods I 772.

[0061] Example 10

[0062] from Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 It can be known that, in the welding equipment of the present invention: each pressure head unit also includes a stop gasket 773, and the stop gasket 773 is arranged on the guide rod I 772.

[0063] The stop washer 773 controls the maximum descending stroke of the guide rod Ⅰ 772 to prevent the copper mouth from falling. The number of the stop washer 773 is the same as the number of the guide rod Ⅰ 772.

[0064] Embodiment 11

[0065] from Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 It can be seen that the welding equipment of the present invention: each pressure head unit also includes a clamp 778, and the clamp 778 is connected to the dust removal pipe 777.

[0066] The dust removal duct 777 is a hard tube, which is connected to an external hose through a clamp 778 to extract dust.

[0067] Example 12

[0068] from Figure 2 , Fig.10 , Fig.11 It can be seen that the welding equipment of the present invention: the upper mechanism also includes a pressure head cleaning mechanism 9, which includes a mechanism mounting frame 901, a lifting cylinder 902, a brush assembly mounting plate 903, four linear bearings 904, four guide rods II 905, a connecting plate I 907, and a brush assembly 909; the mechanism mounting frame 901 is connected to the welding head X-axis assembly 141 in the galvanometer mechanism, and the connecting plate I 907 and the brush assembly mounting plate 903 are respectively located above and below the mechanism mounting frame 901; the lifting cylinder 922 is fixed on the upper surface of the mechanism mounting frame 901, and four linear bearings 904 are fixed on the upper surface of the mechanism mounting frame 901, and are evenly distributed with the lifting cylinder 902 as the center, and the guide rod II 905 passes through the linear bearing 904, and its upper and lower ends are respectively connected to the connecting plate I 907 and the brush assembly mounting plate 903; the brush assembly 909 is connected to the brush assembly mounting plate 903.

[0069] Among them: the guide rod II 905 plays a guiding role, and the connecting plate I 907 connects the four guide rods II 905 together, thereby strengthening the strength of the guide rods II 905.

[0070] After welding is completed, the lifting cylinder 902 works, driving the brush assembly mounting plate 903 to rise and fall through the linear bearing 904, and then driving the brush assembly 909 to move up and down, so as to clean the welding slag and dust accumulated in the copper nozzle and on its lower end surface, so that the copper nozzle can reliably press the integrated cover plate during subsequent welding, while also ensuring that it will not affect the efficiency of the laser.

[0071] Embodiment 13

[0072] from Figure 2 , Fig.10 , Fig.11 It can be seen that the welding equipment of the present invention: the pressure head cleaning mechanism also includes a guide rod support 906 and a guide rod mounting seat 908. The guide rod support 906 is fixed under the connecting plate I 907, and the guide rod mounting seat 908 is fixed on the brush assembly mounting plate 903. The upper end of the guide rod II 905 is connected to the guide rod support 906 through a thread, and the lower end is connected to the guide rod mounting seat 908.

[0073] The guide rod II 905 is connected to the guide rod support 906 by threads, and the position of the guide rod support 906 on the guide rod II 905 can be adjusted, thereby adjusting the extension length of the lifting cylinder 902 to meet the compatibility of cleaning pressure heads of different heights.

[0074] Embodiment 14

[0075] from Figure 2 , Fig.10 , Fig.11 It can be known that the welding equipment of the present invention: the brush assembly 909 includes a connecting plate II 910, a synchronous belt 911, a stepper motor 912, a driving shaft 913, a driving synchronous wheel 914, a plurality of bearings 915, and four brush units. The upper plate of the connecting plate II 910 is fixedly connected to the bottom of the brush assembly mounting plate 903, and a plurality of bearings 915 are installed in its lower plate; the stepper motor 912 is fixed on the top of the brush assembly mounting plate 903, the upper end of the driving shaft 913 is connected to the stepper motor 912 through a coupling, and the lower end is connected to the connecting plate II 910 through a bearing 915, and the driving synchronous wheel 914 is installed on the driving shaft 913; each brush unit is connected to the connecting plate II 910 through a bearing 915; the synchronous belt 911 connects the driving synchronous wheel 914 and the brush unit.

[0076] The stepper motor 912 works, driving the brush unit to rotate through the active shaft 913, the active synchronous wheel 914, and the synchronous belt 911 to clean the copper nozzle pressure head. The spacing between the four brush units is the same as the spacing between the pressure head units. The brush assembly 909 is a replaceable assembly, which can be replaced for different battery modules to meet the requirements of product compatibility.

[0077] Embodiment 15

[0078] from Figure 2 , Fig.10 , Fig.11 It can be seen that the welding equipment of the present invention: each brush unit includes a driven shaft 916, a driven synchronous wheel 917, and a brush 918; the driven shaft 916 is connected to the connecting plate II 910 through a bearing 915, and its upper end is covered with a driven synchronous wheel 917, and its lower end is connected to the brush 918; the synchronous belt 911 connects the active synchronous wheel 914 and the driven synchronous wheel 917.

[0079] from Fig.12 It can be seen that: the stepper motor 912 works, and drives the four driven synchronous wheels 917 and four driven shafts 916 to rotate through the active shaft 913, the active synchronous wheel 914, and the synchronous belt 911, and then drives the four brushes 918 to rotate and clean the copper nozzle pressure head. The spacing of the four passive shafts 916 is the same as the spacing of the pressure head. The lifting cylinder 902 works, and drives the brush assembly mounting plate 903 to descend through the linear bearing 904, and then drives the brush assembly 909 to descend. When the brush 918 enters the inner hole of the copper nozzle, the stepper motor 912 works, and the brush 918 rotates to clean the pressure head. The brush 918 rotates and moves up and down with the lifting cylinder 902 to achieve comprehensive cleaning of the pressure head, including cleaning of its pressing end face.

[0080] Example 16

[0081] from Figure 2 , Fig.10 , Fig.11 It can be seen that the welding equipment of the present invention: the brush assembly 909 also includes a tensioning wheel 919, a tensioning shaft 920, and a tensioning bolt 921; the tensioning shaft 920 is connected to the connecting plate II 910 through a bearing 915, the tensioning wheel 919 is sleeved on the tensioning shaft 920, and the tensioning bolt 921 is installed on the side of the lower plate of the connecting plate II 910; the synchronous belt 911 connects the active synchronous wheel 914, the driven synchronous wheel 917, and the tensioning wheel 919.

[0082] The tensioning bolt 921 pushes the tensioning shaft 920 to make the tensioning wheel 91 tighten the synchronous belt 911 to ensure the stability of power transmission.

[0083] from Figure 1 It can be seen that the welding equipment of the utility model is divided into five major parts: an equipment bottom frame 11, a lower mechanism 12, a middle mechanism 13, an upper mechanism 14 and an outer cover: the lower mechanism is divided into station A and station B, and stations AB both include a friction roller line, jacking positioning, and a pallet; the middle mechanism is divided into station A and station B, and stations AB both include a pressure head mechanism, a three-axis assembly, a three-axis frame, and a dust collection mechanism; the upper mechanism includes a galvanometer mechanism, a three-axis frame, and a pressure head cleaning mechanism.

[0084] The advantages of the welding equipment of the utility model are: 1. The special-shaped part of the upper copper nozzle makes the spacing between adjacent clamping units smaller, so as to meet the needs of side-by-side welding of battery modules with smaller pole spacing, and can weld four adjacent front, back, left and right batteries at once, and then move to the next welding position; avoid the possibility of the clamping device damaging the welded position when the interval welding is performed due to the large spacing between adjacent units; 2. When the clamping assembly is pressed down as a whole, the lower copper nozzle contacts the welding surface, and the spring is compressed to provide clamping force: in this way, even if the welding surface height is inconsistent, the spring can provide clamping force to each copper nozzle while compensating for the height difference to ensure the quality of welding; 3. When the welding is completed, the lifting cylinder drives multiple brushes to enter the inner hole of the copper nozzle, and at the same time, the stepping motor drives the brush to rotate and clean the pressure head, remove the welding slag and dust inside and on the end face of the copper nozzle, so that the copper nozzle can reliably clamp the integrated cover plate; 4. The pressure head assembly and the brush assembly can be replaced according to the model of the battery module. Therefore, the welding equipment of the utility model can well ensure the welding quality and expand its scope of application.

Claims

1. A welding device for an integrated cover plate of a lithium battery module, characterized in that: It comprises an equipment bottom frame (11), a lower mechanism (12), a middle mechanism (13), an upper mechanism (14), and an outer cover (15): the lower mechanism (12) comprises a module transport and lifting mechanism, the upper mechanism (14) comprises a galvanometer mechanism, the middle mechanism (13) comprises two symmetrically arranged clamping mechanisms, each of which comprises an X-axis linear module (1), an X-axis servo motor (2), an X-axis transmission rod (3), a Y-axis linear module (4), a Z-axis mounting plate (6), a clamping The invention relates to a motor drive assembly (7) and an X-axis mounting plate (8); two X-axis linear modules (1) are arranged on the left and right and connected by an X-axis transmission rod (3); an X-axis servo motor (2) is installed in the middle of the X-axis transmission rod (3); both ends of the X-axis mounting plate (8) are connected to the left and right X-axis linear modules (1); a Y-axis linear module (4) is installed on the X-axis mounting plate (8); a Z-axis mounting plate (6) is connected to the Y-axis linear module (4); a clamping assembly (7) is connected to the Z-axis mounting plate (6) and moves up and down along the Z-axis.

2. The welding device according to claim 1, characterized in that: The clamping assembly (7) comprises a pressure head assembly mounting plate (70), a Z-axis cylinder (71), a floating joint (74), a pressure head assembly (77), and two linear guide rails (78); the Z-axis cylinder (71) is fixed on the Z-axis mounting plate (6), and its lower part is connected to the pressure head assembly mounting plate (70) through the floating joint (74); the pressure head assembly (77) is connected to the bottom of the pressure head assembly mounting plate (70); the two linear guide rails (78) are fixed to the left and right ends of the front of the Z-axis mounting plate (6), and the left and right ends of the rear of the pressure head assembly mounting plate (70) are connected to the linear guide rails (78).

3. The welding equipment according to claim 2, characterized in that: The clamping assembly (7) also includes a buffer unit, which includes an oil pressure buffer (79) and a buffer bumper (80). The oil pressure buffer (79) is arranged at the lower part of the Z-axis mounting plate (6), and the buffer bumper (80) is arranged on the side of the pressure head assembly mounting plate (70).

4. The welding equipment according to claim 2, characterized in that: The clamping assembly (7) also includes a height measuring unit, which includes a distance sensor (72) and a distance sensor cylinder (76). The distance sensor cylinder (76) is fixed in front of the Z-axis mounting plate (6), and the distance sensor (72) is connected to the distance sensor cylinder (76).

5. The welding equipment according to claim 2, characterized in that: The pressure head assembly (77) comprises a copper nozzle mounting plate (771), four groups of pressure head units, each pressure head unit comprises a guide rod I (772), an upper copper nozzle (775), an air inlet joint (776), a dust removal pipeline (777), and a lower copper nozzle (779); the copper nozzle mounting plate (771) is fixed below the pressure head assembly mounting plate (70), the guide rod I (772) passes through the copper nozzle mounting plate (771) and is connected to the upper copper nozzle (775), and the upper copper nozzle (775) is connected to the lower copper nozzle (779). The upper plane of the lower copper nozzle (779) is provided with an annular groove, and a circle of blowing holes are arranged in the annular groove. The blowing holes are arranged obliquely and their lower ends are opened on the inner wall of the lower copper nozzle (779); the lower part of the upper copper nozzle (775) is provided with an L-shaped air inlet hole, the air inlet end of the air inlet hole opens on the outer wall of the upper copper nozzle (775) and is connected to the air inlet joint (776), and its air outlet end is connected to the annular groove of the lower copper nozzle (779); the dust removal pipeline (777) is connected to the side hole of the upper copper nozzle (775).

6. The welding equipment according to claim 5, characterized in that: the guide rod There are two Ⅰ (772); the upper copper nozzle (775) is a special-shaped part, one of the square diagonals is milled into a bevel, and the other diagonal is respectively connected to a guide rod Ⅰ (772); the non-milled corner of the upper copper nozzle (775) extends into the milled corner of the adjacent upper copper nozzle (775).

7. The welding equipment according to claim 1, characterized in that: The upper mechanism also includes a pressure head cleaning mechanism (9), which includes a mechanism mounting frame (901), a lifting cylinder (902), a brush assembly mounting plate (903), four linear bearings (904), four guide rods II (905), a connecting plate I (907), and a brush assembly (909); the mechanism mounting frame (901) is connected to the welding head X-axis assembly (141) in the galvanometer mechanism, and the connecting plate I (907) and the brush assembly mounting plate (903) are respectively located in the mechanism The lifting cylinder (902) is fixed on the upper part of the mechanism mounting frame (901); four linear bearings (904) are fixed on the upper part of the mechanism mounting frame (901) and are evenly distributed around the lifting cylinder (902); a guide rod II (905) passes through the linear bearing (904), and its upper and lower ends are respectively connected to a connecting plate I (907) and a brush assembly mounting plate (903); and a brush assembly (909) is connected to the brush assembly mounting plate (903).

8. The welding device according to claim 7, characterized in that: The pressure head cleaning mechanism also includes a guide rod support (906) and a guide rod mounting seat (908). The guide rod support (906) is fixed below the connecting plate I (907), and the guide rod mounting seat (908) is fixed above the brush assembly mounting plate (903). The upper end of the guide rod II (905) is connected to the guide rod support (906) through a thread, and the lower end is connected to the guide rod mounting seat (908).

9. The welding device according to claim 7, characterized in that: The brush assembly (909) comprises a connecting plate II (910), a synchronous belt (911), a stepper motor (912), a driving shaft (913), a driving synchronous wheel (914), a plurality of bearings (915), and four brush units. The upper plate of the connecting plate II (910) is fixedly connected to the bottom of the brush assembly mounting plate (903), and a plurality of bearings (915) are installed in the lower plate; the stepper motor (912) is fixed to the top of the brush assembly mounting plate (903); the upper end of the driving shaft (913) is connected to the stepper motor (912) through a coupling, and the lower end is connected to the connecting plate II (910) through a bearing (915); the driving synchronous wheel (914) is installed on the driving shaft (913); each brush unit is connected to the connecting plate II (910) through a bearing (915); and the synchronous belt (911) connects the driving synchronous wheel (914) and the brush unit.

10. The welding device according to claim 9, characterized in that: Each brush unit comprises a driven shaft (916), a driven synchronous wheel (917), and a brush (918); the driven shaft (916) is connected to the connecting plate II (910) via a bearing (915), the upper end of the driven synchronous wheel (917) is sleeved with the driven synchronous wheel (917), and the lower end of the driven shaft (916) is connected to the brush (918); the synchronous belt (911) is connected to the driving synchronous wheel (914) and the driven synchronous wheel (917).

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