A laser flight welding apparatus for lithium battery tabs and method of use

Abstract

The application discloses a kind of laser flight welding devices and use method for lithium battery connecting piece, specifically related to lithium battery preparation technical field, the application is in by setting ejector unit, forming groove and rotating support in alignment warehouse, the entering direction and attitude of connecting piece are preliminarily constrained by limiting passage, the lowermost connecting piece is pushed to the upper surface of rotating support by positioning push block, and connecting piece is supported by rotating support, so that connecting piece is evenly stressed in subsequent forming and moving process, the top table is driven upward by jacking cylinder, so that connecting piece is pressed into the forming groove in the middle of the lower surface of adsorption plate two, so that the shape correction of connecting piece is completed in alignment warehouse, so that connecting piece is accurately fitted to the same polarity of the pole lug position of a plurality of battery cells, reduce the problem of uneven welding quality caused by pole lug height tolerance or connecting piece deformation, avoid welding focal point deviation caused by connecting piece warping or size deviation, improve welding stability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery preparation, in particular to a laser flying welding device for a lithium battery connecting sheet and a use method. BACKGROUND

[0002] Lithium ion batteries are widely used in power batteries, energy storage batteries and consumer electronics. In the process of assembling an electric core, a module or a battery package, it is usually necessary to reliably electrically connect conductive components such as tabs, busbars (busbars) and connecting sheets to form an electrical connection loop that meets the large current transmission requirements. The welding quality of the connecting sheet will directly affect the internal resistance consistency, temperature rise level and cycle life of the battery module, and therefore high requirements are put forward for the stability of the welding process, the consistency of the welding spots and the production rhythm.

[0003] The existing connecting sheet welding methods include resistance welding, ultrasonic welding and laser welding. Among them, laser welding has the characteristics of high energy density, relatively controllable heat-affected zone and easy automation, and gradually becomes a commonly used process for connecting the connecting sheet with the tab or busbar. In the automatic production line, in order to improve the rhythm and reduce the handling and start-stop time between stations, the laser "flying welding" method is often used, that is, the welding spot is processed under the condition of continuous movement of the workpiece or high-speed scanning of the galvanometer, so as to realize continuous processing of multiple welding spots and high-efficiency production.

[0004] However, the connecting sheet is not effectively shape-corrected before being attached to multiple electric core tabs, and is easily warped and bent due to the influence of material elasticity, transportation or stacking, resulting in a difference in the actual welding interface between the connecting sheet and the tab, so that the laser welding focal point deviates from the actual welding interface, and local virtual welding, overwelding or tab burning easily occurs during welding. SUMMARY

[0005] The application aims to provide a laser flying welding device for a lithium battery connecting sheet and a use method to solve the problems mentioned in the background.

[0006] The technical problem solved by the application is:

[0007] The connecting sheet is not effectively shape-corrected before being attached to multiple electric core tabs, resulting in a difference in the actual welding interface between the connecting sheet and the tab, so that the laser welding focal point deviates from the actual welding interface.

[0008] The application can be implemented by the following technical solutions:

[0009] A kind of laser flight welding device for lithium battery tab, including welding bin mounted on base and the conveying unit of the lithium battery module of a plurality of in turn to the inside of welding bin, the side of welding bin towards conveying direction is equipped with the alignment bin for tab and lithium battery unit correction, and the side of conveying unit away from welding bin is slidably equipped with docking feeding unit;

[0010] Docking feeding unit includes sliding plate along the base sliding, the width of the sliding plate is less than the width of conveying unit, and the sliding plate is slidably equipped with lifting plate on the top, and the side of lifting plate is parallelly equipped with the pushing unit for pushing a plurality of battery core into battery shell;

[0011] The side of battery shell towards pushing unit is equipped with opening;

[0012] The side of pushing unit is equipped with mounting bracket plate, and the lower surface of the mounting bracket plate is equipped with the alignment mounting unit for fixing cover plate and battery shell;

[0013] The inside of the alignment bin is equipped with the limiting channel for tab entry, and the inside of the alignment bin is slidably equipped with the ejection unit for tab stamping;

[0014] The ejection unit includes sliding seat along the guide rail of the inner wall of the alignment bin, the bottom surface of the sliding seat is equipped with bottom support, and the upper surface of the sliding seat is embeddedly equipped with lifting top station, and the bottom support is equipped with lifting cylinder for pushing the movement of the lifting top station;

[0015] The inside of the alignment bin is equipped with rotating support for supporting tab, and the upper side of the rotating support is equipped with adsorption plate two for moving in vertical direction and adsorbing and fixing tab, and the lower surface of the adsorption plate two is equipped with forming groove for cooperating with the ejection unit.

[0016] Further technical improvements of the application are that the limiting channel includes placing opening, the side of the placing opening is equipped with guide side plate, the guide side plate and the rotating support are equipped with material conveying channel, and the lower side of the placing opening is equipped with bearing plate flush with the rotating support.

[0017] The inner wall surface of the alignment bin is embeddedly equipped with positioning push block pushed by pushing cylinder.

[0018] Further technical improvements of the application are that the rotating support includes side groove on the inner wall of the alignment bin, the inside of the side groove is equipped with two turnover plates through rotating cylinder, the two turnover plates are fixed through connecting rod, and the distance between the two turnover plates is less than the length of tab.

[0019] Further technical improvements of the present application are as follows: the opposite mounting unit comprises a support base mounted at the end of the lower surface of the mounting rack plate, the surface of the mounting rack plate is provided with a limiting slot for limiting the entry of the cover plate, the inner wall surface of the support base is mounted with a vertical guide rail, a sliding seat is slidably arranged on the vertical guide rail, and a electric clamping jaw for clamping the bottom surface of the cover plate is mounted on the upper surface of the sliding seat.

[0020] Further technical improvements of the present application are as follows: the inner side of the support base is provided with a push plate pushed by a correction air cylinder near the rear side of the vertical guide rail, and an adsorption plate one for adsorbing and fixing the side surface of the cover plate is mounted on the inner side of the push plate.

[0021] The surface of the support base is provided with a wire feeding cylinder for the entry of the screw, the wire feeding cylinder is arranged in alignment with the screw hole on the cover plate and the battery shell, the outer end surface of the correction air cylinder is mounted with a feeding air cylinder, and the pushing end of the feeding air cylinder is connected with an electric screwdriver for screwing the screw.

[0022] Further technical improvements of the present application are as follows: the conveying unit comprises two conveying racks, the inner wall surface of each conveying rack is mounted with a conveying belt, a plurality of positioning blocks for limiting the battery shell are mounted on the conveying belt, and the gap length of the two conveying belts is greater than the width of the sliding plate.

[0023] Further technical improvements of the present application are as follows: the upper surface of the sliding plate is mounted with a stroke air cylinder for pushing the movement of the lifting plate, the upper surface of the lifting plate is embeddedly mounted with an adjusting block sleeved with a double-way screw rod, the upper end of the adjusting block is fixed with a positioning plate, and the inner wall surface of the positioning plate is mounted with a clamping block.

[0024] The lower surface of the clamping block is outwardly inclined on both sides and is arranged in matching with the groove of the battery shell.

[0025] Further technical improvements of the present application are as follows: the pushing unit comprises a fixed table, the upper surface of the fixed table is mounted with a positioning frame, the upper surface of the positioning frame is provided with an entry slot for the entry of a single electric core, and the inner side of the positioning frame is provided with a moving plate pushed by a lateral air cylinder and moving to the opening side.

[0026] A use method of a laser flying welding device for lithium battery connecting piece, the use method comprising the following steps:

[0027] Step one: initially, the lifting plate is flush with the height of the fixed table, after the battery shell is positioned and mounted into the lifting plate, the single electric core is pushed into the battery shell by the moving plate in sequence, then the lifting plate is raised to the same height as the support base, the cover plate is fixed by the electric clamping jaw, then it is lowered to the same height as the opening of the battery shell, the cover plate side is adsorbed by the adsorption plate one and is matched and mounted with the opening, and the screw is mounted into the screw hole of the cover plate and the battery shell by the electric screwdriver.

[0028] Step two, after the sliding plate moves the battery shell with the installed cover plate to the top of the positioning block at the end of the conveying belt, the lifting plate is lowered to a certain height, the battery shell is installed into the positioning block, and then the two adjusting blocks drive the positioning plates to move away from each other, and the lifting plate is disconnected from the battery shell;

[0029] Step three, after the battery shell reaches the alignment warehouse, the connecting piece is pushed into the limiting channel by the positioning push block, the connecting piece is extruded upward by the lifting cylinder and enters the forming groove in the adsorption plate two, the sliding seat moves to the lower side of the bearing plate, the turnover plate rotates 90 degrees clockwise, the adsorbed connecting piece is pushed downward by the adsorption plate two, the connecting piece contacts the same polarity of the pole lug of the plurality of battery cells, and the connecting piece is welded into the welding warehouse for laser flying welding.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] 1. By arranging the ejection unit, the forming groove and the rotating support in the alignment warehouse, the entering direction and posture of the connecting piece are preliminarily constrained by the limiting channel, the lowermost connecting piece is pushed to the upper surface of the rotating support by the positioning push block, the connecting piece is supported by the rotating support, the stress of the connecting piece is uniform in the subsequent forming and moving process, the lifting cylinder drives the top to move upward, the connecting piece is extruded into the forming groove in the middle of the lower surface of the adsorption plate two, thereby the shape correction of the connecting piece is completed in the alignment warehouse, the sliding seat moves to the lower side of the bearing plate, the turnover plate rotates 90 degrees clockwise, and the connecting piece is accurately attached to the same polarity of the pole lug of the plurality of battery cells under the adsorption of the adsorption plate two, thereby reducing the problem of uneven welding quality caused by the height tolerance of the pole lug or the deformation of the connecting piece, the flatness, bending angle and size accuracy of the connecting piece are corrected before welding, the welding focal point is prevented from deviating due to the warping or size deviation of the connecting piece, and the welding stability is improved.

[0032] 2. By arranging the butt joint feeding unit, the battery shell is limited and installed by the lifting plate, the inner cavity bottom surface of the battery shell is consistent with the pushing path of the pushing unit, the pushing unit pushes a single battery cell into the battery shell through the opening on the side of the pushing unit, the sequential filling of the battery cell is realized, the lifting plate is raised to the assembly height of the alignment installation unit, the opening position of the cover plate and the battery shell is aligned and fixed, the cover plate is reliably clamped into the battery shell, the sliding plate slides along the base to one end of the conveying unit and is lowered at the same time, the assembled battery shell is smoothly transferred to the conveying unit, the battery shell is accurately placed in the positioning block on the two conveying belts, and the posture of the battery shell is maintained during conveying.

[0033] 3、By setting the alignment installation unit, the entering position of the cover plate is preliminarily limited by the limiting slot, when the cover plate enters into the clamping range of the electric clamping jaw, the electric clamping jaw clamps the bottom surface of the cover plate, under the guidance of the vertical guide rail, the electric clamping jaw drives the cover plate to move downward along the vertical direction, and the cover plate is lowered to the same height position as the opening of the battery shell, so that the cover plate and the battery shell are aligned and installed subsequently, after the cover plate is lowered to the target height, the correction cylinder acts and pushes the push plate to move forward, the side surface of the cover plate is adsorbed and fixed by the adsorption plate, at this time, the electric clamping jaw releases the clamping of the bottom surface of the cover plate, and retreats downward, the cover plate is inserted and matched with the opening position of the battery shell under the pushing action of the push plate, the feed cylinder is coaxially aligned with the screw hole on the cover plate and the battery shell, under the pushing action of the feeding cylinder, the electric batch is fed along the feed cylinder direction, and the screw in the screw hole is tightened, so that the reliable fixation between the cover plate and the battery shell is realized. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to facilitate the understanding of those skilled in the art, the present application is further described below in combination with the drawings.

[0035] Figure 1 It is an external structure diagram of the present application.

[0036] Figure 2 It is a partial enlarged view of A in the present application. Figure 1

[0037] Figure 3 It is an installation structure diagram of the lifting plate and the fixing table of the present application.

[0038] Figure 4 It is a partial three-dimensional structure diagram of the mounting rack plate of the present application.

[0039] Figure 5 It is a three-dimensional installation structure diagram of the clamping block of the present application.

[0040] Figure 6 It is a partial enlarged view of B in the present application. Figure 3

[0041] Figure 7 It is a structure sectional view of the alignment bin of the present application.

[0042] Figure 8 It is a partial enlarged view of C in the present application. Figure 7

[0043] ​​​In the figure: 1, welding bin; 2, alignment bin; 3, conveying frame; 4, conveying belt; 5, positioning block; 6, sliding plate; 7, lifting plate; 8, mounting frame plate; 9, stroke cylinder; 10, fixed table; 11, positioning frame; 12, entry slot; 13, limiting slot; 14, positioning plate; 15, clamping block; 16, support seat; 17, vertical guide rail; 18, sliding seat; 19, electric clamping jaw; 20, adsorption plate I; 21, wire feeding cylinder; 22, electric batch; 23, push plate; 24, placement opening; 25, side slot; 26, turnover plate; 27, sliding seat; 28, adsorption plate II; 29, bearing plate; 30, bottom support; 31, top table; 32, guide side plate; 33, positioning push block; 34, jacking cylinder. DETAILED DESCRIPTION

[0044] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0045] Please refer to Figures 1-8 As shown in the figure, the present application provides a laser flying welding device for lithium battery connecting piece, which comprises a welding bin 1 mounted on a base, a conveying unit for conveying a plurality of lithium battery modules into the welding bin 1 in sequence is mounted on the base, a alignment bin 2 for correcting the connecting piece and the lithium battery unit is arranged on one side of the welding bin 1 facing the conveying direction, and a docking feeding unit is slidingly arranged on the side of the conveying unit away from the welding bin 1;

[0046] The docking feeding unit comprises a sliding plate 6 sliding along the base, the width of the sliding plate 6 is smaller than the width of the conveying unit, a lifting plate 7 for fixing the battery shell in stages is arranged above the sliding plate 6, and a pushing unit for pushing a plurality of battery cells into the battery shell is arranged on one side of the lifting plate 7 in parallel;

[0047] An opening is arranged on one side of the battery shell facing the pushing unit;

[0048] A mounting frame plate 8 is arranged on one side of the pushing unit, and a aligning and mounting unit for fixing the cover plate and the battery shell is mounted on the lower surface of the mounting frame plate 8;

[0049] A limiting channel for the connecting piece to enter is arranged in the inside of the alignment bin 2, and an ejection unit for stamping the connecting piece is slidingly arranged in the inside of the alignment bin 2;

[0050] The ejection unit comprises a sliding seat 27 sliding along the inner wall guide rail of the alignment bin 2, a bottom support 30 is mounted on the bottom surface of the sliding seat 27, a lifting top table 31 is embedded and mounted on the upper surface of the sliding seat 27, and a jacking cylinder 34 for driving the top table 31 to move is mounted on the bottom support 30;

[0051] The inside of the alignment bin 2 is provided with a rotating support for supporting the connecting piece, and the upper part of the rotating support is provided with an adsorption plate two 28 moving in the vertical direction for adsorbing and fixing the connecting piece.

[0052] The inner wall surface of the alignment bin 2 is embedded with a positioning push block 33 pushed by a pushing cylinder.

[0053] Initially, the sliding plate 6 and the lifting plate 7 are located on one side of the pushing unit, the battery shell is installed by the lifting plate 7, the inner cavity bottom surface of the battery shell is consistent with the pushing path of the pushing unit, and the pushing unit sequentially pushes a single cell through the battery shell to the opening on one side of the pushing unit into the battery shell, realizing the sequential filling of the cell and avoiding the inclination or misplacement of the cell during the assembly process.

[0054] After the cell is installed, the lifting plate 7 is raised to the assembly height of the alignment installation unit, the alignment installation unit aligns and fixes the opening position of the cover plate and the battery shell, and the cover plate is reliably clamped into the battery shell, thereby forming a battery module with stable structure and consistent size, providing a stable assembly basis for subsequent connecting piece welding.

[0055] Subsequently, the sliding plate 6 slides along the base to one end of the conveying unit and is lowered synchronously, stably transferring the completed assembled battery shell to the conveying unit until the lifting plate 7 is completely separated from the battery shell, avoiding structural interference during the conveying process. The conveying unit continues to run and conveys the battery shell to the position below the alignment bin 2.

[0056] When the battery shell reaches the position below the alignment bin 2, the connecting piece enters the inside of the alignment bin 2 through the limiting channel, the limiting channel preliminarily constrains the entering direction and posture of the connecting piece to prevent the connecting piece from deviating, turning over or having abnormal posture. Subsequently, the lowermost connecting piece is pushed to the upper surface of the rotating support by the positioning push block 33, and the connecting piece is supported by the rotating support, so that the connecting piece is uniformly stressed during subsequent forming and moving, preventing local warping or deformation.

[0057] At this time, the adsorption plate two 28 located above the rotating support moves downward along the vertical direction to adsorb and fix the upper surface of the connecting piece, ensuring the stable position of the connecting piece during the forming process. Then, the jacking cylinder 34 drives the top platform 31 to move upward, so that the connecting piece is pressed into the forming groove in the middle of the lower surface of the adsorption plate two 28, thereby completing the shape correction of the connecting piece in the alignment bin 2. By setting the ejection unit, the forming groove and the rotating support in the alignment bin 2, the flatness, bending angle and size accuracy of the connecting piece are corrected before welding, avoiding the deviation of the welding focal point caused by the warping or size deviation of the connecting piece, and improving the welding stability.

[0058] After the shape correction is completed, the sliding seat 27 moves along the guide rail on the inner wall of the alignment bin 2 to the position directly below the bearing plate 29, the turnover plate 26 rotates 90 degrees clockwise, and in the moving process under the adsorption of the adsorption plate two 28, the connecting sheet is accurately attached to the same polarity of the plurality of battery cell tabs, reducing the welding quality unevenness caused by the tab height tolerance or the connecting sheet deformation, through the cooperation of the top table 31 and the forming groove, the consistency of the connecting sheet and each tab is guaranteed, providing a stable and uniform welding interface for subsequent laser flight welding, thereby improving the welding quality and consistency. The connecting sheet is always in a controlled state during the adsorption, bearing and forming process, avoiding shaking or deviation during the turnover, downward movement or attachment process, and improving the reliability of the welding process from the structure.

[0059] Referring to Figure 7 and Figure 8 , the limiting channel includes a placing opening 24, one side of the placing opening 24 is provided with a guide side plate 32, the guide side plate 32 and the rotating support are provided with a material conveying channel, and the lower side of the placing opening 24 is provided with a bearing plate 29 flush with the rotating support;

[0060] The rotating support includes a side groove 25 provided on the inner wall of the alignment bin 2, and two turnover plates 26 are installed in the side groove 25 through a rotary cylinder, the two turnover plates 26 are fixed through a connecting rod, and the distance between the two turnover plates 26 is less than the length of the connecting sheet.

[0061] When working, the connecting sheet enters the inside of the alignment bin 2 through the placing opening 24, the placing opening 24 provides an initial entry window for the connecting sheet, so that the connecting sheet moves downward under the action of gravity, the guide side plate 32 limits the lateral position of the connecting sheet, so that the connecting sheet maintains a predetermined lateral attitude during the falling and conveying process, avoiding tilting, transverse movement or turning over.

[0062] Since the width of the material conveying channel matches the width of the connecting sheet, the connecting sheet is constrained on both sides during the conveying process, thereby further ensuring the attitude consistency of the connecting sheet before entering the rotating support.

[0063] When the connecting sheet moves downward along the material conveying channel to the position of the bearing plate 29, the connecting sheet is temporarily supported by the bearing plate 29, so that the connecting sheet is in a stable transition state before entering the rotating support, preventing the connecting sheet from being impacted and deformed due to free falling.

[0064] When the connecting sheet enters the two turnover plates 26, the two ends of the connecting sheet are supported by the two turnover plates 26 respectively, and the turnover plate 26 maintains the initial supporting angle under the drive of the rotary cylinder, thereby forming stable support for the connecting sheet.

[0065] participate Figure 3 , Figure 4 and Figure 6As shown, the correct installation unit includes a support seat 16 installed at the end of the lower surface of the mounting rack plate 8, the surface of the mounting rack plate 8 is provided with a limiting slot 13 for limiting the entry of the cover plate, the inner wall surface of the support seat 16 is provided with a vertical guide rail 17, a sliding seat 18 is slidably arranged on the vertical guide rail 17, and the upper surface of the sliding seat 18 is provided with an electric clamping jaw 19 for clamping the bottom surface of the cover plate;

[0066] The inner side surface of the support seat 16 is provided with a push plate 23 pushed by a correction air cylinder near the rear side of the vertical guide rail 17, and the inner side of the push plate 23 is provided with an adsorption plate 20 for adsorbing and fixing the side surface of the cover plate;

[0067] The surface of the support seat 16 is provided with a wire feeding cylinder 21 for the entry of the screw, and the wire feeding cylinder 21 is coaxially arranged with the screw hole on the cover plate and the battery shell. The outer end surface of the correction air cylinder is provided with a feeding air cylinder, and the pushing end of the feeding air cylinder is connected with an electric wrench 22 for screwing.

[0068] In the working process, the cover plate is first vertically entered into the limiting slot 13 on the surface of the mounting rack plate 8 through an external feeding mechanism or manually, the limiting slot 13 preliminarily limits the entry position of the cover plate, so that the cover plate maintains a predetermined posture in the vertical direction and prevents deviation or inclination.

[0069] In the initial state, the electric clamping jaw 19 is located below the limiting slot 13, when the cover plate enters the clamping range of the electric clamping jaw 19, the electric clamping jaw 19 clamps the bottom surface of the cover plate, so that the cover plate is stably constrained in the vertical direction. Then, under the guidance of the vertical guide rail 17, the electric clamping jaw 19 drives the cover plate to move downward along the vertical direction, and the cover plate is lowered to the same height position as the opening of the battery shell, so that the cover plate and the battery shell are subsequently aligned and installed.

[0070] After the cover plate is lowered to the target height, the correction air cylinder acts and pushes the push plate 23 to move forward, the adsorption plate 20 installed in the inner side of the push plate 23 adsorbs and fixes the side surface of the cover plate, and the cover plate is laterally limited and corrected by lateral adsorption. At this time, the electric clamping jaw 19 releases the clamping of the bottom surface of the cover plate and retreats downward, so that the cover plate is inserted and matched with the opening position of the battery shell under the pushing action of the push plate 23, thereby completing the comprehensive alignment of the cover plate in the horizontal direction and the vertical direction.

[0071] The wire feeding cylinder 21 provides an entry channel for the screw, and the wire feeding cylinder 21 is coaxially arranged with the screw hole on the cover plate and the battery shell. Under the pushing action of the feeding air cylinder, the electric wrench 22 is fed along the direction of the wire feeding cylinder 21, the screw in the screw hole is screwed, and the reliable fixation between the cover plate and the battery shell is realized.

[0072] After the screwing is completed, the electric batch 22 and the feeding cylinder are reset, the push plate 23 and the adsorption plate 1 are released from adsorption, and the correct installation unit completes a complete cover plate assembly process, thereby providing a stable structure and uniform size for the subsequent connecting piece welding process.

[0073] As shown in Figure 1 The conveying unit includes two conveying frames 3, the inner wall surface of each conveying frame 3 is provided with a conveying belt 4, the conveying belt 4 is provided with a plurality of positioning blocks 5 for limiting the battery shell, and the gap length of the two conveying belts 4 is greater than the width of the sliding plate 6.

[0074] When the butt joint feeding unit completes the cell filling and the cover plate fixing, the sliding plate 6 carries the battery shell and moves along the base direction to the conveying unit, and in the descending process, the sliding plate 6 passes through the gap between the two conveying belts 4, so that the battery shell is accurately placed in the positioning blocks 5 on the two conveying belts 4, and the battery shell maintains a predetermined posture during the conveying process. Since the gap width of the conveying belt 4 is greater than the width of the sliding plate 6, the sliding plate 6 will not interfere with the conveying belt 4 during the up and down movement, thereby ensuring the smoothness of the battery shell handover process.

[0075] The battery shell advances stably along the predetermined conveying path, and sequentially enters the specified position of the alignment bin 2 and the welding bin 1, thereby providing an accurate conveying basis for the subsequent connecting piece alignment installation and welding process.

[0076] As shown in Figure 1 , Figure 3 and Figure 5 The upper surface of the sliding plate 6 is provided with a stroke cylinder 9 for driving the movement of the lifting plate 7, the upper surface of the lifting plate 7 is embedded with an adjusting block which is threadedly connected with the bidirectional screw rod, the upper end of the adjusting block is fixed with a positioning plate 14, and the inner wall surface of the positioning plate 14 is provided with a clamping block 15.

[0077] The lower surface of the clamping block 15 is outwardly inclined on both sides and is matched with the groove of the battery shell.

[0078] At the beginning, the battery shell is installed on the lifting plate 7, and the groove of the battery shell gradually enters the clamping block 15 in the vertical direction, and the clamping block 15 is automatically corrected relative to the battery shell during entering the groove by the guiding action of the inclined structure of the lower surface of the clamping block 15, so that clamping or deflection is avoided, and after the clamping block 15 completely enters the groove of the battery shell, the positioning plate 14 reliably limits the battery shell, so that the battery shell remains in a stable state during the movement of the sliding plate 6, the lifting of the lifting plate 7 and the subsequent assembly process, and the position of the adjusting block can be adjusted by the bidirectional screw rod, so that battery shells of different specifications or size tolerances can be adapted, when the battery shell is completed The cell filling and the cover plate fixing need to be handed over to the conveying unit, the stroke cylinder 9 reverses the action, drives the lifting plate 7 to descend, and the clamping block 15 gradually separates from the battery shell groove, and smoothly exits under the guidance of the inclined structure, avoiding pulling or interfering with the battery shell, so that the smooth release of the battery shell is realized.

[0079] Referring to Figure 2 and Figure 3 As shown, the pushing unit includes a fixed table 10, the upper surface of the fixed table 10 is provided with a positioning frame 11, the upper surface of the positioning frame 11 is provided with an entering slot 12 for a single cell to enter, and the inner side of the positioning frame 11 is provided with a moving plate which is pushed by a lateral cylinder and moves to the opening side.

[0080] When working, a single cell enters the inside of the positioning frame 11 through the entering slot 12 and completes the initial positioning, and then the lateral cylinder acts to push the moving plate to move along the horizontal direction to the opening side of the battery shell.

[0081] Under the pushing action of the moving plate, the cell moves stably along the predetermined pushing path and enters the inner cavity of the battery shell through the opening of the battery shell towards the pushing unit side. Since the positioning frame 11 plays a circumferential limiting role on the cell, and the moving plate provides a stable pushing force, the cell remains stable in posture during entering the battery shell, avoiding skewing, clamping or collision.

[0082] When a single cell is filled, the lateral cylinder reverses the action to drive the moving plate to reset, and the positioning frame 11 is in a standby state again so that the next cell enters and the above pushing process is repeated, so that multiple cells are sequentially and orderly filled into the battery shell.

[0083] The application provides a use method of a laser flying welding device for lithium battery connecting pieces, which comprises the following steps:

[0084] Step one, initially, the lifting plate 7 is flush with the height of the fixed table 10, after positioning and installing the battery shell into the lifting plate 7, the mobile plate pushes the single cell into the battery shell through the opening in turn, then the lifting plate 7 is raised to the same height as the support seat 16, the electric clamping jaw 19 fixes the cover plate, then moves down to the same height as the opening of the battery shell, the adsorption plate one 20 adsorbs the side of the cover plate, and then the electric screw 22 installs the screw into the screw hole of the cover plate and the battery shell;

[0085] Step two, after the sliding plate 6 moves the battery shell with the installed cover plate to the upper side of the positioning block 5 at the end of the conveying belt 4, the lifting plate 7 is lowered, the battery shell is installed into the positioning block 5, then the two adjusting blocks drive the positioning plates 14 to move away from each other, and the lifting plate 7 is disconnected with the battery shell;

[0086] Step three, after the battery shell reaches the alignment bin 2, the connecting piece is pushed into the limiting channel by the positioning push block 33, the top table 31 is pushed upward by the jacking cylinder 34 to extrude the connecting piece upward and into the forming groove in the adsorption plate two 28, the sliding seat 27 slides to the lower side of the bearing plate 29, the turnover plate 26 rotates 90 degrees clockwise, the adsorbed connecting piece is moved downward by the adsorption plate two 28, the connecting piece contacts the same polarity of the tab on the plurality of cells, and the connecting piece is inserted into the welding bin 1 to perform laser flying welding.

[0087] In use, the present application sets the ejection unit, the forming groove and the rotating support in the alignment bin 2, the limiting channel preliminarily restricts the entering direction and posture of the connecting piece, prevents the connecting piece from deviating, the lowermost connecting piece is pushed to the upper surface of the rotating support by the positioning push block 33, the connecting piece is supported by the rotating support, the stress of the connecting piece is uniform in the subsequent forming and moving process, the top table 31 is driven upward by the jacking cylinder 34, the connecting piece is pressed into the forming groove in the middle of the lower surface of the adsorption plate two 28, thereby completing the shape correction of the connecting piece in the alignment bin 2, the sliding seat 27 moves to the lower side of the bearing plate 29, the turnover plate 26 rotates 90 degrees clockwise, and moves downward under the adsorption of the adsorption plate two 28, the connecting piece is accurately attached to the tab position of the same polarity of the plurality of cells, reduces the welding quality uneven problem caused by the height tolerance of the tab or the deformation of the connecting piece, completes the flatness, bending angle and size accuracy correction of the connecting piece before welding, avoids the welding focal point deviation caused by the warping or size deviation of the connecting piece, and improves the welding stability.

[0088] By setting the butt joint loading unit, the battery shell is limited by the lifting plate 7 Installation, the inner cavity bottom surface of the battery shell is consistent with the pushing path of the pushing unit, the pushing unit pushes the single cell through the opening of the battery shell on the side of the pushing unit into the battery shell in turn, realizes the sequential filling of the cell, the lifting plate 7 rises to the assembly height of the alignment installation unit, aligns and fixes the opening position of the cover plate and the battery shell, so that the cover plate can be reliably clamped into the battery shell, the sliding plate 6 slides to one end of the conveying unit along the base, and the height is lowered synchronously, the assembled battery shell is smoothly handed over to the conveying unit, so that the battery shell is accurately placed in the positioning block 5 on the two conveying belts 4, and the battery shell maintains the predetermined posture during conveying;

[0089] By setting the alignment installation unit, the entering position of the cover plate is preliminarily limited by the limiting slot 13, when the cover plate enters the clamping range of the electric clamping jaw 19, the electric clamping jaw 19 clamps the bottom surface of the cover plate, under the guidance of the vertical guide rail 17, the electric clamping jaw 19 drives the cover plate to move downward along the vertical direction, and the cover plate is lowered to the same height position as the opening of the battery shell, so as to facilitate the subsequent alignment and installation of the cover plate and the battery shell. After the cover plate is lowered to the target height, the correction cylinder acts and pushes the push plate 23 to move forward, the side surface of the cover plate is adsorbed and fixed by the adsorption plate 20, at this time the electric clamping jaw 19 releases the clamping of the bottom surface of the cover plate, and retreats downward, the cover plate is inserted and matched with the opening position of the battery shell under the pushing action of the push plate 23, the thread feeding cylinder 21 is coaxially aligned with the screw hole on the cover plate and the battery shell, under the pushing action of the feeding cylinder, the electric batch 22 feeds along the direction of the thread feeding cylinder 21, and the screw in the screw hole is tightened, so as to realize the reliable fixation between the cover plate and the battery shell.

[0090] The above is only a preferred embodiment of the present application, not any form of limitation on the present application, although the present application has been disclosed as above with a preferred embodiment, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solution range of the present application, can make some changes or modifications of the above disclosed technical content as equivalent embodiments, but as long as it does not deviate from the technical solution content of the present application, any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application, all still belong to the range of the technical solution of the present application.

Claims

1. A laser flying welding device for lithium battery tabs, comprising a welding cabin (1) mounted on a base and a conveying unit for conveying a plurality of lithium battery modules into the welding cabin (1) in sequence, characterized in that: The welding bin (1) is provided with a positioning bin (2) for connecting the sheet with the lithium battery unit correction on one side of the conveying direction, and a docking feeding unit is slidably arranged on the side away from the welding bin (1); The docking feeding unit comprises a sliding plate (6) sliding along the base, the width of the sliding plate (6) is smaller than the width of the conveying unit, a lifting plate (7) is arranged above the sliding plate (6) and is movable in stages and fixed to the battery shell, and a pushing unit for pushing a plurality of battery cells into the battery shell is arranged on one side of the lifting plate (7) in parallel; The battery shell is provided with an opening on the side facing the pushing unit; A mounting rack plate (8) is arranged on the upper side of the pushing unit, a positioning mounting unit for fixing the cover plate to the battery shell is mounted on the lower surface of the mounting rack plate (8); The inside of the positioning bin (2) is provided with a limiting channel for the connection sheet to enter, and the inside of the positioning bin (2) is slidably provided with an ejection unit for stamping the connection sheet; The ejection unit comprises a sliding seat (27) sliding along the inner wall guide rail of the positioning bin (2), a bottom support (30) is mounted on the bottom surface of the sliding seat (27), and a lifting top table (31) is embedded and mounted on the upper surface of the sliding seat (27), and a jacking cylinder (34) for driving the movement of the top table (31) is mounted on the bottom support (30); The inside of the positioning bin (2) is provided with a rotating support for supporting the connection sheet, and an adsorption plate two (28) for moving in the vertical direction and adsorbing and fixing the connection sheet is arranged above the rotating support, and a forming groove for cooperating with the ejection unit is arranged in the middle of the lower surface of the adsorption plate two (28); The inner wall surface of the positioning bin (2) is embedded with a positioning push block (33) driven by a pushing cylinder.

2. The laser flight welding apparatus for lithium battery tabs of claim 1, wherein, The limiting channel comprises a placing opening (24), one side of the placing opening (24) is provided with a guide side plate (32), a feeding channel is arranged between the guide side plate (32) and the rotating support, and a bearing plate (29) flush with the rotating support is arranged below the placing opening (24).

3. The laser flight welding apparatus for lithium battery tabs of claim 2, wherein, The rotating support comprises a side groove (25) arranged on the inner wall of the positioning bin (2), two turnover plates (26) are mounted in the side groove (25) by a rotating cylinder, the two turnover plates (26) are fixed by a connecting rod, and the distance between the two turnover plates (26) is smaller than the length of the connection sheet.

4. The laser flight welding apparatus for lithium battery tabs of claim 3, wherein, The positioning mounting unit comprises a support seat (16) mounted on the end of the lower surface of the mounting rack plate (8), a limiting slot (13) for limiting the entry of the cover plate is arranged on the surface of the mounting rack plate (8), a vertical guide rail (17) is mounted on the inner wall surface of the support seat (16), a sliding seat (18) is slidably arranged on the vertical guide rail (17), and an electric clamping jaw (19) for clamping the bottom surface of the cover plate is mounted on the upper surface of the sliding seat (18).

5. A laser flight welding apparatus for lithium battery tabs as claimed in claim 4, wherein, The inner side of the support seat (16) is provided with a push plate (23) driven by a correction cylinder near the rear side of the vertical guide rail (17), and an adsorption plate one (20) for adsorbing and fixing the side surface of the cover plate is mounted on the inner side of the push plate (23); The surface of the support seat (16) is provided with a wire feeding cylinder (21) for screw feeding, the wire feeding cylinder (21) is arranged in alignment with the screw hole on the cover plate and the battery shell, the outer end face of the correction cylinder is provided with a feeding cylinder, and the pushing end of the feeding cylinder is connected with an electric wrench (22) for screw tightening.

6. The laser flight welding apparatus for lithium battery tabs of claim 5, wherein, The conveying unit comprises two conveying frames (3), the inner wall surface of each conveying frame (3) is provided with a conveying belt (4), a plurality of positioning blocks (5) for limiting the battery shell are arranged on the conveying belt (4), and the gap length of the two conveying belts (4) is greater than the width of the sliding plate (6).

7. The laser flight welding apparatus for lithium battery tabs of claim 6, wherein, The upper surface of the sliding plate (6) is provided with a stroke cylinder (9) for driving the movement of the pushing and lifting plate (7), the upper surface of the lifting plate (7) is embeddedly provided with an adjusting block which is threadedly connected with a double-way screw rod, the upper end of the adjusting block is fixedly provided with a positioning plate (14), and the inner wall surface of the positioning plate (14) is provided with a clamping block (15). The lower surface of the clamping block (15) is outwardly inclined at both sides and is arranged in matching with the groove of the battery shell.

8. The laser flight welding apparatus for lithium battery tabs of claim 7, wherein, The pushing unit comprises a fixed table (10), the upper surface of the fixed table (10) is provided with a positioning frame (11), the upper surface of the positioning frame (11) is provided with an entering slot (12) for entering a single cell, and the inner side of the positioning frame (11) is provided with a moving plate which is pushed by a lateral cylinder and moves to the opening side.

9. A method of using a laser flyer welding device for lithium battery tabs, based on the laser flyer welding device for lithium battery tabs according to claim 8, characterized in that, The use method comprises the following steps: Step one: initially, the lifting plate (7) is flush with the height of the fixed table (10), the battery shell is positioned and installed into the lifting plate (7), then the single cell is pushed into the battery shell by the moving plate in sequence, then the lifting plate (7) is raised to the same height as the support seat (16), the cover plate is fixed by the electric clamping jaw (19), then the lifting plate (7) is lowered to the same height as the opening of the battery shell, then the cover plate is adsorbed by the adsorption plate one (20) and is matched and installed with the opening, and the screw is installed into the screw hole of the battery shell by the electric wrench (22); Step two: the sliding plate (6) moves the battery shell with the installed cover plate to the position above the positioning block (5) at the end of the conveying belt (4), the lifting plate (7) is lowered in height, the battery shell is installed into the positioning block (5), then the two adjusting blocks drive the positioning plates (14) to move away from each other, and then the lifting plate (7) is disconnected with the battery shell; Step three: when the battery shell reaches the alignment bin (2), the positioning pushing block (33) pushes the connecting piece into the limiting channel, the jacking cylinder (34) pushes the top table (31) upward to extrude the connecting piece upward and into the forming groove in the adsorption plate two (28), the sliding seat (27) is slid to be below the bearing plate (29), the turnover plate (26) is rotated by 90 degrees clockwise, the adsorbed connecting piece is pushed downward by the adsorption plate two (28), the connecting piece is in contact with the same polarity of the pole tabs of the plurality of cells, and the connecting piece in contact with the pole tabs is put into the welding bin (1) to perform laser flying welding.

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