Welding fixture for assembling and manufacturing lithium battery cover plate

Abstract

The invention relates to the technical field of welding fixtures, and discloses a welding fixture for assembling and manufacturing a lithium battery cover plate, comprising: a base on which a first placing plate and two second placing plates are slidably mounted; a butt joint assembly; a positioning assembly; and a pressing plate; the first placing plate is descended to trigger the butt joint assembly to drive the two second placing plates to oppositely slide to the butt joint point, and the flexible connection sheet is aligned with the battery cell tab through the hollow part, so that the cover plate body and the flexible connection sheet can be ensured to be limited at the appointed positions in the corresponding placing grooves; the cover plate body and the flexible connecting piece are automatically and accurately aligned after being limited and clamped, so that the problem that the flexible connecting piece and the cover plate body cannot be accurately aligned after being limited due to the fact that the relative positions of the cover plate body, the positive electrode flexible connecting piece and the negative electrode flexible connecting piece cannot be limited after the cover plate body, the positive electrode flexible connecting piece and the negative electrode flexible connecting piece are clamped and limited is solved; and finally, the whole welding clamp, the cover plate main body and the flexible connecting piece are fed into a welding station to start welding operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding fixtures, in particular to a welding fixture for assembling and manufacturing lithium battery cover plates. BACKGROUND

[0002] In the production process of lithium batteries, welding is one of the key steps in manufacturing cover plates. In the manufacturing of lithium battery cover plates, one of the processes is to fix and weld the soft connecting piece and the cover plate body together. In the existing welding technology of the soft connecting piece and the cover plate body, the soft connecting piece is usually placed directly on the cover plate for welding. The soft connecting piece and the cover plate are prone to shift and misalign, and at this time, the staff needs to manually align the soft connecting piece and the cover plate.

[0003] Currently, there are some existing technologies that can position and clamp the soft connecting piece and the cover plate before welding starts. For example, patent publication No. CN213672590U mainly uses the following technical means: the cover plate body is placed by the cover plate positioning block, and is limited by the cover plate positioning pin, and one side of the cover plate body is close to one of the cover plate positioning pins. The cover plate pressing block is driven by the air cylinder to press down on the cover plate body. Then the negative soft connecting piece and the positive soft connecting piece are placed in the soft connecting piece positioning pin in the soft connecting piece positioning block in the corresponding direction, and the two ends of the turnover frame are turned to the pressing position to press and fix the soft connecting piece in the corresponding soft connecting piece positioning groove. The turnover frame is fixed in the pressing position. Finally, the entire welding fixture, the cover plate body and the soft connecting piece are sent to the welding station to start the welding operation. After analysis, the technical scheme has the following disadvantages: the fixed positioning groove is used to place the cover plate body and the soft connecting piece respectively, but the size of the positioning groove is usually larger than the size of the corresponding workpiece. When the cover plate body and the soft connecting piece are placed in the corresponding positioning groove, there is inevitably a displacement deviation, which will cause an error in the alignment of the soft connecting piece and the positive and negative electrode tabs. Manual observation and timely adjustment of the position of the cover plate body and the soft connecting piece when they are positioned are required to achieve accurate butt joint between the cover plate body and the soft connecting piece. After clamping and limiting, the accuracy of the alignment between the cover plate body and the soft connecting piece cannot be ensured. Therefore, the present application provides a welding fixture for assembling and manufacturing lithium battery cover plates, which has a simple and ingenious structure and can automatically and accurately align and butt joint the cover plate body and the soft connecting piece after clamping and limiting. SUMMARY

[0004] The present application aims to solve the technical problem that the cover plate body and the soft connecting piece cannot be automatically and accurately aligned and butt jointed after clamping and limiting in the prior art.

[0005] The object of the present application can be achieved by the following technical solutions: A welding fixture for assembling and manufacturing lithium battery cover plates, comprising: The base is slidably installed with a first placing plate and two second placing plates, the first placing plate is provided with a first placing groove for placing the cover plate body, the two second placing plates are symmetrically arranged at the two ends of the first placing plate, and the two second placing plates are provided with a second placing groove, and the two second placing grooves are used for placing the positive and negative soft connection pieces, the second placing plate is provided with a hollow part at the bottom, and the second placing groove is communicated with the hollow part; The docking assembly is installed in the base, and when the first placing plate descends, the two second placing plates are driven by the docking assembly to slide towards each other to the docking point, and the docking point is located at the two ends of the cover plate body on the first placing plate; The positioning assembly is installed on the first placing plate, and when the cover plate body falls in the first placing groove, the cover plate body triggers the positioning assembly to drive the cover plate body to the central position in the first placing groove; and The two second placing plates are respectively hinged with two pressing plates on the opposite surfaces, the two second placing plates are respectively slidably installed with a limiting plate on the opposite surfaces, the limiting plate penetrates the opposite surfaces of the two second placing plates, and the two second placing plates are respectively provided with a transmission assembly; when the pressing plate is turned to the first placing plate, the pressing plate drives the limiting plate to move towards the first placing plate through the transmission assembly, so that the soft connection piece is abutted on one side of the second placing groove close to the first placing plate, and then the pressing plate is turned to cover the second placing groove and press the soft connection piece.

[0006] As a further scheme of the application, the docking assembly comprises: The transmission block is fixed on the first placing plate and slidably installed on the base, and the transmission block is connected with the output end of the driving source, and the driving source is used for driving the transmission block to rise and fall; The lifting rod is connected with the transmission block and slidably installed on the vertical plate, and the vertical plate is vertically arranged and fixed on the base; The two sides of the lifting rod are respectively rotatably connected with one end of the two connecting rods, the other end of the two connecting rods is respectively rotatably connected with the two second placing plates, the two connecting rods are symmetrically and obliquely arranged, and the lifting rod is located below the two second placing plates; The two sliding rings are rotatably installed on the base, and the two connecting rods are arranged at the same height, and the two sliding rings are slidably connected with the two connecting rods; and The two second placing plates are respectively fixed with a guide bar, and the base is fixed with a guide plate, and the guide plate is provided with a horizontal sliding groove slidably connected with the guide bar.

[0007] As a further scheme of the present application: the transmission block is connected with the lifting rod through an elastic telescopic piece; when the elastic telescopic piece is contracted to the shortest state, the first placing plate is located below the second placing plate, and the top surface of the first placing slot inner cover plate body is lower than the bottom surface of the second placing slot inner soft connecting piece; a wedge-shaped block is slidingly installed on the vertical plate and penetrates the vertical plate side wall, and the wedge-shaped block is connected with the vertical plate through an elastic piece; when the elastic piece is in a free state, the wedge-shaped block is located below the lifting rod, and the lifting rod is lowered to drive the wedge-shaped block to slide to the outside of the vertical plate, so that the elastic piece is deformed.

[0008] As a further scheme of the present application: the positioning assembly comprises a plurality of L-shaped blocks arranged along the edge of the first placing slot, the inflection points of the L-shaped blocks are rotationally installed in the first placing slot, and the top end of the L-shaped block is connected with the first placing plate through a spring; when the spring is in a free state, the bottom end of the L-shaped block is higher than the bottom surface of the first placing slot.

[0009] As a further scheme of the present application: the positioning assembly further comprises: a positioning plate fixed on the first placing plate; and a stop plate slidingly installed on the positioning plate, and the bottom surface of the stop plate is provided with a protection piece and is in contact with the cover plate body in the first placing slot, the stop plate is connected with the positioning plate through a return piece, and the positioning plate is provided with a locking pin for locking the stop plate; when the stop plate is positioned at the highest point of its movement connection through the locking pin, the return piece is in a stretched state.

[0010] As a further scheme of the present application: the transmission assembly comprises: a driving shaft rotationally installed on the second placing plate and driven to rotate by an output source, the driving shaft is fixedly connected with the pressing plate; and a driven shaft, two driving shafts are connected with the two ends of the driving shaft through two abutting pieces respectively, two push blocks are fixed on the two driven shafts respectively, two limiting plates are elastically connected on each second placing plate, and the two limiting plates are arranged at the two ends of the pressing plate, and the position of the limiting plate interferes with the rotation path of the push block.

[0011] As a further scheme of the present application: the abutting piece comprises a driving sleeve detachably fixedly connected with the driving shaft and a driven sleeve detachably fixedly connected with the driven shaft, the driving sleeve and the driven sleeve are rotationally connected, and the two are connected through a coil spring, the rotation friction force between the driving sleeve and the driven sleeve is smaller than the trigger force of the coil spring to cause deformation.

[0012] The present application has the following beneficial effects: (1) In the present application, the docking assembly is triggered by the descending first placing plate to drive the two second placing plates to slide towards each other to the docking point, and the soft connecting piece is aligned with the electrode lug through the hollow part, so that the cover plate body and the soft connecting piece can be ensured to be positioned at the specified position in the corresponding placing groove, and automatic accurate alignment of the two after limiting and clamping the cover plate body and the soft connecting piece is realized, avoiding the problem that the relative position between the three cannot be limited after clamping and limiting the cover plate body and the positive and negative soft connecting pieces, resulting in the problem that the soft connecting piece cannot be accurately aligned after being limited with the cover plate body, and finally the whole welding fixture and the cover plate body and the soft connecting piece are sent to the welding station to start the welding operation; (2) In the present application, after the two second placing plates slide to the docking point, the first placing plate rises until the top surface of the cover plate body abuts against the bottom surface of the soft connecting piece, which can ensure that the cover plate body and the soft connecting piece are in a separated state during the movement of the soft connecting piece to the docking point, avoiding damage to the electronic element caused by friction, and improving the safety and non-destructiveness of the docking process of the device; (3) In the present application, when the cover plate body is placed in the first placing groove, the cover plate body falls to press the bottom end of the L-shaped block, so that the L-shaped block is turned over, and in this process, the spring is stretched, and the top end of the L-shaped block is gathered to move the cover plate body to the central position of the first placing groove. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application will be further described below with reference to the accompanying drawings.

[0014] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the A part of the present application Figure 1 enlarged structure; Figure 3 is a schematic diagram of the state structure of the transmission block descending in the present application; Figure 4 is a schematic diagram of the structure of the lifting rod descending driven by the transmission block in the present application; Figure 5 is a schematic diagram of the structure of the cover plate body abutting against the soft connecting piece in the present application; Figure 6 is a schematic diagram of the structure of the wedge-shaped block in the present application; Figure 7 is a schematic diagram of the structure of the hollow part in the present application; Figure 8 is a schematic diagram of the structure of the first placing plate in the present application; Figure 9 is a schematic diagram of the structure of the positioning assembly in the present application; Figure 10 is a schematic diagram of the structure of the B part of the present application Figure 9 enlarged; Figure 11 is a structure diagram of the C part in the application Figure 1 enlarged structure diagram of the C part in the application Figure 12 is a structure diagram of the pressure plate in the application Figure 13 is a structure diagram of the second placing groove of the pressure plate cover in the application Figure 14 is a structure diagram of the abutting part in the application

[0015] In the figure: 1, base; 2, first placing plate; 3, second placing plate; 4, butt joint assembly; 401, transmission block; 402, lifting rod; 403, elastic telescopic part; 404, connecting rod; 405, slip ring; 406, guide bar; 407, wedge block; 408, elastic part; 5, positioning assembly; 501, L-shaped block; 502, spring; 503, positioning plate; 504, abutting plate; 505, reset part; 506, locking pin; 6, pressure plate; 7, limiting plate; 8, transmission assembly; 801, driving shaft; 802, output source; 803, driven shaft; 804, push block; 805, abutting part; 8051, driving sleeve; 8052, driven sleeve; 8053, coil spring; 9, vertical plate; 10, guide plate; 11, first placing groove; 12, second placing groove. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0017] Please refer to Figures 1-5 , the application is a welding fixture for assembling and manufacturing a lithium battery cover plate, comprising: a base 1, a first placing plate 2 and two second placing plates 3 are slidably installed on the base 1, a first placing groove 11 for placing a cover plate body is formed in the first placing plate 2, the two second placing plates 3 are symmetrically arranged at two ends of the first placing plate 2, and a second placing groove 12 is formed in each of the two second placing plates 3, the two second placing grooves 12 are respectively used for placing a positive soft connection piece and a negative soft connection piece, a hollow part is arranged at the bottom of the second placing plate 3, and the second placing groove 12 is in communication with the hollow part; a butt joint assembly 4 is installed in the base 1, when the first placing plate 2 is lowered, the two second placing plates 3 are driven by the butt joint assembly 4 to slide towards each other to a butt joint point, and the butt joint point is located at two ends of the cover plate body on the first placing plate 2; A positioning assembly 5 is installed on the first placement plate 2; when the cover plate body falls in the first placement slot 11, the cover plate body triggers the positioning assembly 5 to drive the cover plate body to the center position in the first placement slot 11; and Two pressing plates 6 are respectively hinged on the opposite surfaces of the two second placement plates 3; limit plates 7 are respectively slidably installed on the opposite surfaces of the two second placement plates 3 and penetrate through the opposite surfaces of the two second placement plates 3; and transmission assemblies 8 are respectively arranged on the two second placement plates 3; when the pressing plate 6 is flipped to the first placement plate 2, the pressing plate 6 drives the limit plate 7 to move to the direction close to the first placement plate 2 through the transmission assembly 8, so as to abut the soft connecting piece on the side of the second placement slot 12 close to the first placement plate 2, and then the pressing plate 6 is turned to cover the second placement slot 12 and press the soft connecting piece.

[0018] In one case of the embodiment, the soft connecting pieces are placed and positioned in the two second placement slots 12 before the two second placement plates 3 slide towards each other, and the soft connecting pieces are aligned with the electrode tabs through the hollow parts after the two second placement plates 3 slide towards each other to the butt joint point; the contact surface of the pressing plate 6 and the soft connecting piece is provided with a protective sponge; it should be noted that when the staff manually places the cover plate body in the first placement slot 11, the falling of the cover plate body will trigger the positioning assembly 5 to calibrate it to the center position of the first placement slot 11, and the height of the first placement slot 11 is small, so the cover plate body will not be damaged.

[0019] In actual application of the embodiment, in the initial state, the first placement plate 2 is located at the highest point of its moving path, and the distance between the two second placement plates 3 is maximum; when the cover plate body is placed in the first placement slot 11, the falling of the cover plate body will trigger the positioning assembly 5, the positioning assembly 5 drives the cover plate body to the center position in the first placement slot 11, then the positive and negative soft connecting pieces are respectively placed in the two second placement slots 12, the pressing plate 6 is flipped to the first placement plate 2, the pressing plate 6 drives the limit plate 7 to move to the direction close to the first placement plate 2 through the transmission assembly 8, so as to abut the soft connecting piece on the side of the second placement slot 12 close to the first placement plate 2, then the pressing plate 6 is turned to cover the second placement slot 12 and press the soft connecting piece, and then the first placement plate 2 is lowered, the first placement plate 2 drives the two second placement plates 3 to slide towards each other to the butt joint point through the butt joint assembly 4, and the soft connecting pieces are aligned with the electrode tabs through the hollow parts, so that the cover plate body and the soft connecting pieces can be limited at the specified positions in the corresponding placement slots, and automatic and accurate alignment of the cover plate body and the soft connecting pieces after clamping and limiting them can be realized, thereby avoiding the problem that the relative positions between the cover plate body and the positive and negative soft connecting pieces cannot be limited after clamping and limiting them, and the cover plate body and the soft connecting pieces cannot be accurately aligned after being limited, and finally the whole welding fixture and the cover plate body and the soft connecting pieces are sent to the welding station to start the welding operation.

[0020] As Figures 1-7 shown, as a preferred embodiment of the present application, the docking assembly 4 comprises: a transmission block 401 fixed on the first placement plate 2 and slidingly installed on the base 1, the transmission block 401 being connected with the output end of a driving source for driving the transmission block 401 to lift; a lifting rod 402 connected with the transmission block 401 and slidingly installed on a vertical plate 9 fixed on the base 1; two connecting rods 404, one end of each of the two connecting rods 404 being rotatably connected with the two sides of the lifting rod 402, the other end of each of the two connecting rods 404 being rotatably connected with two second placement plates 3, the two connecting rods 404 being symmetrically and obliquely arranged, and the lifting rod 402 being located below the two second placement plates 3; two sliding rings 405 rotatably installed on the base 1 and in the same height as the two connecting rods 404, the two sliding rings 405 being slidingly matched with the two connecting rods 404, respectively; and two guide strips 406 fixed on the two second placement plates 3, respectively, and a guide plate 10 fixed on the base 1 and having horizontal sliding grooves slidingly matched with the guide strips 406.

[0021] In one case of the present embodiment, the number of the transmission blocks 401 is two, and each is arranged at the end of the first placement plate 2; the driving source can be selected from a hydraulic cylinder, an air cylinder and other mechanisms capable of realizing linear motion, which are not specifically limited in the present embodiment.

[0022] In actual application of the present embodiment, when the driving source drives the transmission block 401 to descend, the lifting rod 402 is synchronously lowered, the two connecting rods 404 are synchronously rotated, and the rotating directions of the two connecting rods 404 are opposite, in the process, the connecting rods 404 and the sliding rings 405 slide relative to each other, and the sliding rings 405 and the base 1 rotate relative to each other, since the guide strips 406 are guided and limited by the horizontal sliding grooves on the guide plate 10, the reverse rotation of the two connecting rods 404 can drive the two second placement plates 3 to move horizontally towards each other until the two second placement plates 3 slide towards each other to the docking point, at this time, the lifting rod 402 descends to the lowest point of its moving path.

[0023] As Figures 1-7As shown, in a preferred embodiment of the present invention, the transmission block 401 is connected to the lifting rod 402 via an elastic telescopic member 403; when the elastic telescopic member 403 is retracted to its shortest state, the first placement plate 2 is located below the second placement plate 3, and the top surface of the cover plate body in the first placement groove 11 is lower than the bottom surface of the soft connecting piece in the second placement groove 12; a wedge block 407 is slidably installed on the upright plate 9, and the wedge block 407 penetrates the side wall of the upright plate 9, and the wedge block 407 is connected to the upright plate 9 via an elastic member 408; when the elastic member 408 is in a free state, the wedge block 407 is located below the lifting rod 402, and the lifting rod 402 descends, causing the wedge block 407 to slide outwards from the upright plate 9, thus deforming the elastic member 408.

[0024] In one embodiment, the elastic telescopic member 403 is a structure composed of multi-stage tubular components with built-in springs. In practical applications, it can also be a structure of gear rack and pinion or electric telescopic rod. This embodiment does not impose specific limitations on it. The elastic member 408 can be a spring or other elastic components, such as silicone pillars or spring sheets. This embodiment does not impose specific limitations on it.

[0025] In practical application, in the initial state, the elastic telescopic member 403 is in a free state (e.g., ...). Figure 1 As shown), at this time, the first placement plate 2 is located at the highest point of its moving path and above the second placement plate 3; after the limiting cover body and the flexible connecting piece are placed and clamped on the first placement plate 2 and the second placement plate 3 respectively, the drive source drives the transmission block 401 to descend, and the elastic telescopic member 403 retracts until it retracts to its shortest state (as shown). Figure 3 As shown), at this time, the first placement plate 2 is located below the second placement plate 3, and the top surface of the main body of the cover plate in the first placement groove 11 is lower than the bottom surface of the flexible connecting piece in the second placement groove 12. During this process, the lifting rod 402 does not descend; then the drive source drives the transmission block 401 to continue descending, which drives the lifting rod 402 to descend synchronously. At the same time, the two connecting rods 404 rotate, causing the two second placement plates 3 to move towards each other. During this process, the lifting rod 402 contacts the wedge block 407 and drives it to slide outward of the vertical plate 9 until the lifting rod 402 descends to the lowest point of its movement path (e.g., Figure 4 As shown), at this time, the lifting rod 402 descends below the wedge block 407, and the elastic force of the elastic element 408 restoring its deformation causes the wedge block 407 to reset and lock above the lifting rod 402 to prevent it from rising (as shown). Figure 6and the elastic extension member 403 is still in the shortest state; then the driving source is powered off, the elastic extension member 403 restores the elastic force of deformation to drive the transmission block 401 to rise until the top surface of the cover body in the first placement slot 11 abuts against the bottom surface of the soft connecting piece in the second placement slot 12, realizing the precise butt joint of the soft connecting piece and the electrode lug of the battery cell, and at this time the elastic extension member 403 is still in the compressed state (as shown in Figure 5 This process can ensure that the cover body and the soft connecting piece are in a separated state during the movement of the soft connecting piece to the butt joint point, avoid damage to the electronic elements caused by friction, and improve the safety and non-destructiveness of the butt joint process of the device.

[0026] As shown in Figures 1-10 As a preferred embodiment of the present application, the positioning assembly 5 includes a plurality of L-shaped blocks 501 arranged along the edge of the first placement slot 11, the inflection point of the L-shaped block 501 is rotatably installed in the first placement slot 11, and the top end of the L-shaped block 501 is connected with the first placement plate 2 through a spring 502; when the spring 502 is in a free state, the bottom end of the L-shaped block 501 is higher than the bottom surface of the first placement slot 11.

[0027] It should be noted that the weight of the cover body is greater than the trigger force of the elastic deformation of the spring 502.

[0028] In actual application, in the initial state, the spring 502 is in a free state, and at this time the bottom end of the L-shaped block 501 is higher than the bottom surface of the first placement slot 11 (as shown in Figure 8 When the cover body is placed in the first placement slot 11, the cover body falls to press the bottom end of the L-shaped block 501, so that the L-shaped block 501 is flipped, and in this process the spring 502 is stretched, and the top end of the L-shaped block 501 is gathered to move the cover body to the central position of the first placement slot 11.

[0029] As shown in Figures 1-11 As a preferred embodiment of the present application, the positioning assembly 5 further includes: a positioning plate 503 fixed on the first placement plate 2; and a stop plate 504 slidably installed on the positioning plate 503, and the bottom surface of the stop plate 504 is provided with a protection member and is in contact with the cover body in the first placement slot 11, the stop plate 504 is connected with the positioning plate 503 through a return member 505, and the positioning plate 503 is provided with a locking pin 506 for locking the stop plate 504; when the stop plate 504 is positioned at the highest point of the movable connection through the locking pin 506, the return member 505 is in a stretched state.

[0030] In one case of the embodiment, the number of the positioning plates 503 is two, and they are arranged at two ends of the first placing plate 2 respectively; the protective member can be sponge, and can also be rubber layer and other materials with protective property, which will not be described herein; the reset member 505 can be spring, and can also be other elastic components such as silica gel column and elastic sheet, which will not be specifically limited in the embodiment.

[0031] In actual application of the embodiment, in the initial state, the abutting plate 504 is positioned at the highest point of the movement connection through the locking pin 506, and at this time, the reset member 505 is in the stretched state; after the cover plate body is placed in the first placing groove 11 in the center through the plurality of L-shaped blocks 501, the locking pin 506 is pulled out, and the reset member 505 restores the action force of deformation to make the abutting plate 504 descend, so that the cover plate body can be compressed.

[0032] As shown in Figures 12-14 As a preferred embodiment of the application, the transmission assembly 8 comprises: a driving shaft 801, which is rotatably installed on the second placing plate 3 and is driven to rotate by an output source 802, and the driving shaft 801 is fixedly connected with the pressing plate 6; and driven shafts 803, two of which are connected with two ends of the driving shaft 801 through two abutting members 805 respectively, and two push blocks 804 are fixedly arranged on the two driven shafts 803 respectively, and two limiting plates 7 are elastically connected on each of the second placing plates 3, and the two limiting plates 7 are arranged at two ends of the pressing plate 6 respectively, and the position of the limiting plate 7 interferes with the rotation path of the push block 804.

[0033] In one case of the embodiment, the abutting member 805 comprises a driving sleeve 8051 which is detachably fixedly connected with the driving shaft 801 and a driven sleeve 8052 which is detachably fixedly connected with the driven shaft 803, the driving sleeve 8051 and the driven sleeve 8052 are rotatably connected, and they are connected through a coil spring 8053, and the rotation friction force between the driving sleeve 8051 and the driven sleeve 8052 is less than the trigger force of the deformation of the coil spring 8053.

[0034] The output source 802 can be a motor assembly, or a gear assembly or a belt pulley assembly driven by a motor, as long as it can make the driving shaft 801 rotate, which will not be specifically limited in the embodiment; the second placing plate 3 and the limiting plate 7 are connected through a spring, and can also be connected through an elastic sheet, which will not be described herein; the detachable fixed connection can be buckle assembly, and can also be threaded connection, which will not be specifically limited herein.

[0035] In actual application, after the soft connecting sheet is placed in the second placing groove 12, the output source 802 drives the driving shaft 801 to rotate to overturn the pressing plate 6, so as to cover the second placing groove 12 and press the soft connecting sheet in the second placing groove 12. In this process, the driving shaft 801 drives the driving sleeve 8051 to rotate synchronously, and then the driven sleeve 8052 rotates synchronously, so that the driven shaft 803 and the push block 804 rotate synchronously, so that the push block 804 pushes the limiting plate 7 to move towards the first placing plate 2, until the soft connecting sheet contacts the side of the second placing groove 12 close to the first placing plate 2; then the driving shaft 801 continues to rotate to drive the driving sleeve 8051 to rotate synchronously, so that the driving sleeve 8051 and the driven sleeve 8052 rotate relatively, and the coil spring 8053 is stretched. This process can make the soft connecting sheet abut against the side of the second placing groove 12 close to the first placing plate 2, ensure that the area where the soft connecting sheet is aligned with the hollow part is the area that should be aligned with the tab of the battery cell, and ensure that the soft connecting sheet is stably positioned in the second placing groove 12 and cannot shake or shift during the alignment process.

[0036] The working principle of the present application is as follows: in the above embodiment of the present application, a welding fixture for assembling a lithium battery cover plate is provided. When the cover plate body is placed in the first placing groove 11, the cover plate body falls to trigger the positioning assembly 5, which drives the cover plate body to move to the central position in the first placing groove 11. Then, the positive soft connecting sheet and the negative soft connecting sheet are respectively placed in the two second placing grooves 12. The pressing plate 6 is turned over to the first placing plate 2, the limiting plate 7 is moved towards the first placing plate 2 by the transmission assembly 8, so that the soft connecting sheet abuts against the side of the second placing groove 12 close to the first placing plate 2. Then, the pressing plate 6 covers the second placing groove 12 and presses the soft connecting sheet. Then, the first placing plate 2 is lowered, and the two second placing plates 3 are moved towards each other to the abutting point by the abutting assembly 4. Then, the soft connecting sheet is aligned with the tab of the battery cell through the hollow part. In this way, it can be ensured that the cover plate body and the soft connecting sheet can be positioned at the specified positions in the corresponding placing grooves, and automatic and accurate alignment of the two after the cover plate body and the soft connecting sheet are clamped and positioned can be realized. This avoids the problem that the relative position between the soft connecting sheet and the cover plate body cannot be accurately aligned after the cover plate body and the positive and negative soft connecting sheets are clamped and positioned. Finally, the entire welding fixture, the cover plate body and the soft connecting sheet are sent to the welding station to start the welding operation.

[0037] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A welding jig for assembling a lithium battery cover plate, characterized by, The utility model relates to a kind of battery cover plate automatic assembly device, including: Base (1), first placement plate (2) and two second placement plates (3) are slidably installed on it, first placement groove (11) for placing cover plate body is opened in the first placement plate (2), two second placement plates (3) are symmetrically arranged at the both ends of first placement plate (2), and second placement groove (12) is opened in the two second placement plates (3), and two second placement grooves (12) are respectively used for placing positive soft connection sheet and negative soft connection sheet, hollow part is provided at the bottom of second placement plate (3), and second placement groove (12) is communicated with hollow part; Docking assembly (4) is installed in base (1);When first placement plate (2) drops, it drives two second placement plates (3) to slide to docking point by docking assembly (4), and the docking point is located at the both ends of cover plate body on first placement plate (2); Positioning assembly (5) is installed on first placement plate (2);When cover plate body falls in first placement groove (11), cover plate body triggers positioning assembly (5) and drives cover plate body to move to the central position in first placement groove (11);And Pressing plate (6), two pressing plates (6) are respectively hinged on the opposite surfaces of two second placement plates (3), limiting plate (7) is slidably installed on the opposite surfaces of two second placement plates (3), and limiting plate (7) penetrates the opposite surfaces of two second placement plates (3), and transmission assembly (8) is respectively provided on two second placement plates (3);When pressing plate (6) is turned to first placement plate (2), pressing plate (6) drives limiting plate (7) to move to the direction close to first placement plate (2) by transmission assembly (8), to abut soft connection sheet on the side of second placement groove (12) close to first placement plate (2), then pressing plate (6) is turned to cover second placement groove (12), and soft connection sheet is pressed tightly.

2. The welding fixture for assembling a lithium battery cover plate according to claim 1, wherein, The docking assembly (4) includes: Transmission block (401) is fixed on first placement plate (2), and it is slidably installed on base (1), and the output end of drive source is connected with transmission block (401), and drive source is used to drive transmission block (401) to lift; Lifting rod (402) is connected with transmission block (401), and is slidably installed on vertical plate (9), and the vertical plate (9) is vertically arranged, and is fixed on base (1); Connecting rod (404), the two sides of lifting rod (402) are rotatably connected with one end of two connecting rods (404) respectively, the other end of two connecting rods (404) is rotatably connected with two second placement plates (3) respectively, two connecting rods (404) are symmetrically and obliquely arranged, and lifting rod (402) is located below two second placement plates (3); Slip ring (405), two slip rings (405) are rotatably installed on base (1) respectively, and two connecting rods (404) are arranged at the same height, and two slip rings (405) are slidably matched with two connecting rods (404) respectively. The guiding strip (406) is fixed on the second placing plate (3), and a guiding plate (10) is fixed on the base (1), and a horizontal sliding groove is formed on the guiding plate (10) and is in sliding fit with the guiding strip (406).

3. The welding fixture for assembling a lithium battery cover plate according to claim 2, wherein, The driving block (401) is connected with the lifting rod (402) through the elastic extension piece (403); when the elastic extension piece (403) is contracted to the shortest state, the first placing plate (2) is located below the second placing plate (3), and the top surface of the inner cover plate body in the first placing groove (11) is lower than the bottom surface of the soft connecting piece in the second placing groove (12); the wedge-shaped block (407) is slidingly installed on the vertical plate (9) and penetrates through the side wall of the vertical plate (9), and the wedge-shaped block (407) is connected with the vertical plate (9) through the elastic piece (408); when the elastic piece (408) is in a free state, the wedge-shaped block (407) is located below the lifting rod (402), and the lifting rod (402) drives the wedge-shaped block (407) to slide outward of the vertical plate (9), so that the elastic piece (408) is deformed.

4. The welding fixture for assembling a lithium battery cover plate according to claim 1, wherein, The positioning assembly (5) comprises a plurality of L-shaped blocks (501) arranged along the edge of the first placing groove (11), the inflection points of the L-shaped blocks (501) are rotatably installed in the first placing groove (11), and the top ends of the L-shaped blocks (501) are connected with the first placing plate (2) through springs (502); when the springs (502) are in a free state, the bottom ends of the L-shaped blocks (501) are higher than the bottom surface of the first placing groove (11).

5. The welding fixture for assembling a lithium battery cover plate according to claim 4, wherein, The positioning assembly (5) further comprises: a positioning plate (503) fixed on the first placing plate (2); and a stop plate (504) slidingly installed on the positioning plate (503), and the bottom surface of the stop plate (504) is provided with a protection piece and is in contact with the cover plate body in the first placing groove (11), the stop plate (504) is connected with the positioning plate (503) through a reset piece (505), and the positioning plate (503) is provided with a locking pin (506) for locking the stop plate (504); when the stop plate (504) is positioned at the highest point of the movement connection through the locking pin (506), the reset piece (505) is in a stretched state.

6. The welding fixture for assembling a lithium battery cover plate according to claim 1, wherein, The transmission assembly (8) comprises: a driving shaft (801) rotatably installed on the second placing plate (3) and driven to rotate by an output source (802), the driving shaft (801) is fixedly connected with the pressing plate (6); and a driven shaft (803), the two driven shafts (803) are connected with the two ends of the driving shaft (801) through two abutting pieces (805), the two driven shafts (803) are respectively fixed with push blocks (804), and two limiting plates (7) are elastically connected to each second placing plate (3), and the two limiting plates (7) are arranged at the two ends of the pressing plate (6), and the position of the limiting plate (7) interferes with the rotation path of the push block (804).

7. The welding fixture for assembling a lithium battery cover plate according to claim 6, wherein, The abutting part (805) comprises a driving sleeve (8051) detachably fixedly connected with the driving shaft (801) and a driven sleeve (8052) detachably fixedly connected with the driven shaft (803), the driving sleeve (8051) is rotatably connected with the driven sleeve (8052), and the driving sleeve (8051) and the driven sleeve (8052) are connected through a coil spring (8053), and the rotating friction between the driving sleeve (8051) and the driven sleeve (8052) is less than the triggering force of the coil spring (8053) to be deformed.

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