Octagonal single-pass positive and negative electrode top cover and welding equipment thereof

Abstract

The invention discloses an octagonal single-pass positive and negative electrode top cover and welding equipment thereof, relates to the field of batteries and welding equipment thereof, and solves the problems that when an existing single-pass positive and negative electrode top cover and welding equipment thereof are used, the production efficiency is low, and a terminal is likely to be inclined, impacted and abraded in the product welding, conveying and unloading process. Comprising a shell, a conveying mechanism, a welding mechanism and a dust removal mechanism, the conveying mechanism comprises a fixing column, a rotating disc, a fixing ring and an overturning plate, the shell is fixed through the overturning plate and the fixing ring, the shell is conveyed through the rotating disc, and the overturning plate at the bottom is gradually controlled to be unfolded after welding is completed; and the welded shell is output from the lower portion, it is guaranteed that one side of the terminal is output towards the upper side, the shell and the negative electrode top cover piece are welded and ground through the welding mechanism, and in the process that the overturning plate is unfolded, chippings and dust in the overturning plate are extracted out from the bottom through the dust removal mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of batteries and welding equipment thereof, and in particular to an octagonal single-pass positive and negative electrode top cover and welding equipment thereof. Background Art

[0002] At present, the battery type commonly used in the power battery industry is the square aluminum shell battery cell. The main components of the square aluminum shell battery cell are the battery cell aluminum shell and the top cover assembly. The main function of the battery cell aluminum shell is to provide a closed space for the battery cell to accommodate the electrode assembly and electrolyte. The internal components of the electrode are connected to the positive and negative terminals of the top cover assembly to achieve electrochemical reactions. The existing top cover shells are mainly round and square, and are basically double-pass or single-pass. The positive and negative top covers of the double-pass shells are both equipped with poles and terminals, and both ends of the shell need to be welded; the single-pass only needs to weld one end.

[0003] The existing dual-channel positive and negative batteries have terminal pole designs on the positive and negative top covers. During the connection process, it is necessary to first weld the terminal top cover at one end, then flip the battery shell, and then weld the terminal top cover at the other end. The operation is relatively cumbersome, and in the process of automated welding and conveying, the unloading operation of the welded battery is relatively cumbersome. If it is directly dumped, it is difficult to ensure stable unloading with the terminal side facing upward, which causes terminal impact wear and affects product quality. Summary of the invention

[0004] The purpose of the present invention is to provide an octagonal single-pass positive and negative electrode top cover and welding equipment thereof, which is convenient for improving battery production efficiency and avoiding terminal impact and wear during welding and transportation, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an octagonal single-pass positive and negative electrode top cover, comprising a shell, the cross-section of the shell is a regular octagon, the bottom of the shell is fixedly connected with a positive electrode top cover, the upper end of the shell is fixedly connected with a negative electrode top cover sheet, the bottom of the negative electrode top cover sheet is fixedly connected with a negative electrode lower plastic and an explosion-proof sheet, the negative electrode top cover sheet is fixedly connected with a protective small sheet, a positive electrode column and a negative electrode column, the bottoms of the positive electrode column and the negative electrode column are respectively fixedly connected with leak-proof sealing rings, the positive electrode column is fixedly connected with a positive electrode upper plastic, the upper side of the positive electrode upper plastic is fixedly connected with a positive terminal, the negative electrode column is fixedly connected with a negative electrode upper plastic, and the upper side of the negative electrode upper plastic is fixedly connected with a negative terminal, so as to improve the battery production efficiency and facilitate use.

[0006] Another technical solution provided by the present invention is:

[0007] A welding device, used for welding the above-mentioned octagonal single-pass positive and negative electrode top covers, includes a machine body, and also includes a conveying mechanism, a welding mechanism and a dust removal mechanism. The conveying mechanism includes a fixed column fixedly installed on the machine body, and the upper side of the fixed column is rotatably connected to a rotating disk. A plurality of groups of fixed rings are evenly and fixedly connected to the rotating disk, and two groups of flip plates are respectively provided below the plurality of groups of fixed rings, which are used to fix the shell through the flip plate and the fixed ring, and to convey the shell through the rotating disk, and gradually control the bottom of the flip plate to unfold after welding is completed, and output the welded shell from the bottom to ensure that one side of the terminal is output toward the upper side. The welding mechanism is installed on the fixed column and is used to weld and grind the shell and the negative electrode top cover sheet. The dust removal mechanism is installed on the machine body and is used to extract the debris and dust in the flip plate from the bottom during the unfolding of the flip plate, so that after the flip plate is fully unfolded, the output shell is relatively clean, which is convenient for avoiding the impact and wear of the terminal during the welding and conveying process.

[0008] Preferably, the conveying mechanism also includes a rotating block fixedly mounted on the upper side of the flip plate, the rotating block is rotatably connected to the bottom surface of the fixed ring through a clockwork shaft, the bottom of the flip plate is fixedly connected to a bottom plate, the inner wall cross-section of the columnar frame structure composed of two groups of adjacent flip plates is a regular octagon, the fixed column is provided with an opening and closing piece for controlling the opening and closing state of the flip plate according to the position of the fixed ring, the flip plate is provided with a fixing piece for stably clamping octagonal shells of different sizes, so that the shell can be fixed by the flip plate and the fixed ring, and the shell can be conveyed by the rotating disk, and after welding is completed, the bottom flip plate is gradually controlled to unfold, and the welded shell is output from the bottom, ensuring that one side of the terminal is output toward the upper side.

[0009] Preferably, the opening and closing member includes a sleeve tube which is slidably connected to the outer wall of the fixing ring in a vertical direction, the sleeve tube is slidably fitted with the outer wall of the flip plate, a guide groove is provided on the outer wall of the fixing column, a guide rod is fixedly connected to the side of the sleeve tube which is slidably fitted with the inner wall of the guide groove, and the inner side of the bottom end of the sleeve tube is designed with an arc-shaped chamfer, so as to facilitate controlling the opening and closing state of the flip plate according to the position of the fixing ring.

[0010] Preferably, the fixing member includes three groups of elastic plates installed on the inner wall of the flip plate, the inner wall of the flip plate is provided with three groups of sliding grooves, sliding plates are fixedly connected in the sliding grooves, both ends of the elastic plate are respectively fixedly connected to two groups of sliding plates on the same straight line, and the side of the sliding plate is fixedly connected to a first spring fixedly connected to the sliding groove, so as to facilitate stable clamping of the octagonal shells of different sizes.

[0011] Preferably, the welding mechanism includes an electric telescopic rod fixedly installed in the fixed column, the telescopic end of the electric telescopic rod is fixedly connected to a lifting frame, the bottom of the lifting frame is fixedly connected to a socket tube, a driving disk is rotatably connected in the socket tube, and a welding head and a grinding head are provided at the bottom of the driving disk to facilitate welding and grinding operations on the shell and the negative electrode top cover sheet.

[0012] Preferably, the dust removal mechanism includes a collecting box fixedly mounted on the machine body, the upper side of the collecting box is rotatably connected to an outer gear ring, the bottom of the outer gear ring is communicated with the collecting box, the upper side of the outer gear ring is opposite to the bottom of the flip plate during the opening and closing process, and a driving motor is fixedly connected to the machine body, the output end of the driving motor is coaxially fixedly connected to a driving gear meshing with the outer gear ring, and the inner wall of the outer gear ring is fixedly connected to a plurality of groups of driving blades, so as to facilitate the extraction of debris and dust in the flip plate from the bottom during the unfolding of the flip plate, so that after the flip plate is fully unfolded, the output shell is relatively clean.

[0013] Preferably, the conveying mechanism also includes a rotating cylinder rotatably connected to the fixed column, the top outer wall of the rotating cylinder is fixedly connected to the rotating disk, the bottom outer wall of the rotating cylinder is fixedly connected to a worm gear, a worm meshing with the worm gear is rotatably connected to the body, one end of the worm is coaxially fixedly connected to a bevel gear, and the upper end of the outer gear ring is coaxially fixedly connected to a bevel gear ring meshing with the bevel gear, so as to facilitate the intermittent slow rotation and switching of the rotating disk during the rotation of the driving motor.

[0014] Preferably, a second spring is fixedly connected to the bottom plate, and a buffer plate slidably connected to the inner wall of the flip plate is fixedly connected to the upper side of the second spring, so as to provide buffer support for the bottom of the shell.

[0015] Preferably, an exhaust filter is fixedly connected to the side of the collection box to facilitate filtering and discharging the gas in the collection box.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides an octagonal single-pass positive and negative electrode top cover and its welding equipment, which solves the problems of low production efficiency in the existing single-pass positive and negative electrode top cover and its welding equipment, and the terminals are easily tilted, hit and worn during the process of product welding, conveying and unloading. The shell is fixed by a flip plate and a fixed ring, and the shell is conveyed by a rotating disk. After the welding is completed, the flip plate at the bottom is gradually controlled to unfold, and the welded shell is output from the bottom, ensuring that one side of the terminal is output toward the upper side. The shell and the negative electrode top cover sheet are welded and polished by a welding mechanism. During the unfolding of the flip plate, the debris and dust in the flip plate are extracted from the bottom by a dust removal mechanism, so that after the flip plate is fully unfolded, the output shell is relatively clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the single-pass positive and negative electrode top cover structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the welding equipment of the present invention; Figure 3 It is a schematic diagram of the local structure of the welding mechanism of the present invention; Figure 4 for Figure 3 A magnified image of the middle A area; Figure 5 It is a schematic diagram of the local structure of the dust removal mechanism of the present invention; Figure 6 for Figure 5 Enlarged view of area B; Figure 7 It is a schematic diagram of the local structure of the conveying mechanism of the present invention; Figure 8 It is a schematic diagram of the partial structure of the opening and closing member of the present invention; Fig. 9 It is a partial structural cross-sectional view of the conveying mechanism of the present invention; Fig.10 for Fig. 9 Enlarged view of area C in the middle; Fig.11 It is a schematic diagram of the local structure of the fixing member of the present invention.

[0019] In the figure: 1-shell; 2-positive electrode top cover; 3-negative electrode lower plastic; 4-negative electrode top cover sheet; 5-positive electrode terminal; 6-positive electrode upper plastic; 7-positive electrode pole; 8-leakage sealing ring; 9-negative electrode terminal; 10-negative electrode upper plastic; 11-negative electrode pole; 12-protective small piece; 13-explosion-proof piece; 14-body; 15-conveying mechanism; 16-fixed column; 17-rotating disk; 18-fixed ring; 19-flip plate; 20-welding mechanism; 21-dust removal mechanism; 22-rotating block; 23-bottom plate; 24-opening and closing piece; 25-fixing piece; 2 6-sleeve tube; 27-guide groove; 28-guide rod; 29-elastic plate; 30-sliding groove; 31-sliding plate; 32-first spring; 33-electric telescopic rod; 34-lifting frame; 35-sleeve tube; 36-driving plate; 37-welding head; 38-grinding head; 39-collection box; 40-external gear ring; 41-driving motor; 42-driving gear; 43-driving blade; 44-rotating cylinder; 45-worm wheel; 46-worm; 47-bevel gear; 48-bevel gear ring; 49-second spring; 50-buffer plate; 51-exhaust filter. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a technical solution: an octagonal single-pass positive and negative electrode top cover, comprising a shell 1, the cross-section of the shell 1 is a regular octagon, the bottom of the shell 1 is fixedly connected with a positive electrode top cover 2, the upper end of the shell 1 is fixedly connected with a negative electrode top cover sheet 4, the bottom of the negative electrode top cover sheet 4 is fixedly connected with a negative electrode lower plastic 3 and an explosion-proof sheet 13, the negative electrode top cover sheet 4 is fixedly connected with a protective small sheet 12, a positive electrode column 7 and a negative electrode column 11, the bottoms of the positive electrode column 7 and the negative electrode column 11 are respectively fixedly connected with a leak-proof sealing ring 8, the positive electrode column 7 is fixedly connected with a positive electrode upper plastic 6, the upper side of the positive electrode upper plastic 6 is fixedly connected with a positive terminal 5, the negative electrode column 11 is fixedly connected with a negative electrode upper plastic 10, and the upper side of the negative electrode upper plastic 10 is fixedly connected with a negative terminal 9.

[0022] Compared with the original double-pass positive and negative electrode top covers, the design process of this structure is simpler. The negative electrode top cover sheet 4 can be manufactured by double riveting, and the positive electrode top cover 2 can be integrated with the shell 1 only in the stamping stage. In addition, considering the automated transportation and processing in the subsequent processing, the octagonal shell 1 and the top cover are easier to identify and locate, and the robot is convenient to grab. At the same time, the octagonal shell 1 structure has stronger pressure resistance and more stable structure than the traditional cylindrical structure. Only one side of the negative electrode top cover sheet 4 needs to be welded, which makes the operation more convenient and efficient. For circular shells with the same diameter, the internal space of the octagonal shell is larger than that of the circular shell; Pack group principle: For a Pack group composed of the same number of battery cells, the connection gap between the battery cells is reduced, and the space utilization rate is improved.

[0023] See also Figure 2-Figure 11 Another aspect of the present invention provides a welding device for welding the above-mentioned octagonal single-pass positive and negative electrode top covers, including a body 14, a conveying mechanism 15, a welding mechanism 20 and a dust removal mechanism 21, the conveying mechanism 15 includes a fixed column 16 fixedly mounted on the body 14, a rotating disk 17 is rotatably connected to the upper side of the fixed column 16, and a plurality of groups of fixed rings 18 are evenly fixedly connected to the rotating disk 17, and two groups of flip plates 19 are respectively provided below the plurality of groups of fixed rings 18, which are used to fix the shell 1 through the flip plates 19 and the fixed rings 18, The shell 1 is transported by the rotating disk 17, and the bottom flip plate 19 is gradually controlled to unfold after welding is completed, and the welded shell 1 is output from the bottom to ensure that the terminal side is output toward the upper side. The welding mechanism 20 is installed on the fixed column 16, and is used for welding and grinding the shell 1 and the negative top cover sheet 4. The dust removal mechanism 21 is installed on the body 14, and is used to extract the debris and dust in the flip plate 19 from the bottom during the unfolding process of the flip plate 19, so that after the flip plate 19 is fully unfolded, the output shell 1 is relatively clean.

[0024] The conveying mechanism 15 also includes a rotating block 22 fixedly installed on the upper side of the flip plate 19, the rotating block 22 is rotatably connected to the bottom surface of the fixed ring 18 through a clockwork shaft, and a bottom plate 23 is fixedly connected to the bottom of the flip plate 19. The inner wall cross-section of the cylindrical frame structure composed of two groups of adjacent flip plates 19 is a regular octagon, and a second spring 49 is fixedly connected to the bottom plate 23. The upper side of the second spring 49 is fixedly connected to a buffer plate 50 that is slidably connected to the inner wall of the flip plate 19. An opening and closing member 24 for controlling the opening and closing state of the flip plate 19 according to the position of the fixed ring 18 is provided on the fixed column 16, and a fixing member 25 for stably clamping octagonal shells 1 of different sizes is provided in the flip plate 19.

[0025] The opening and closing member 24 includes a sleeve tube 26 that is slidably connected to the outer wall of the fixing ring 18 in the vertical direction. The sleeve tube 26 is slidably fitted with the outer wall of the flip plate 19. A guide groove 27 is provided on the outer wall of the fixing column 16. A guide rod 28 that is slidably fitted with the inner wall of the guide groove 27 is fixedly connected to the side of the sleeve tube 26. The inner side of the bottom end of the sleeve tube 26 is designed with an arc-shaped chamfer.

[0026] The fixing member 25 includes three groups of elastic plates 29 installed on the inner wall of the flip plate 19. The inner wall of the flip plate 19 is provided with three groups of sliding grooves 30. The sliding grooves 30 are fixedly connected with sliding plates 31. The two ends of the elastic plate 29 are respectively fixedly connected with two groups of sliding plates 31 on the same straight line. The side of the sliding plate 31 is fixedly connected with a first spring 32 fixedly connected with the sliding groove 30.

[0027] The welding mechanism 20 includes an electric telescopic rod 33 fixedly installed in the fixed column 16, the telescopic end of the electric telescopic rod 33 is fixedly connected to a lifting frame 34, the bottom of the lifting frame 34 is fixedly connected to a socket tube 35, the socket tube 35 is rotatably connected to a drive disk 36, and a welding head 37 and a grinding head 38 are provided at the bottom of the drive disk 36.

[0028] The dust removal mechanism 21 includes a collecting box 39 fixedly mounted on the machine body 14, an exhaust filter 51 is fixedly connected to the side of the collecting box 39, an outer gear ring 40 is rotatably connected to the upper side of the collecting box 39, the bottom of the outer gear ring 40 is connected to the collecting box 39, the upper side of the outer gear ring 40 is opposite to the bottom of the flip plate 19 during the opening and closing process, a driving motor 41 is fixedly connected to the machine body 14, and the model of the driving motor 41 is preferably YYHS-40, and the output end of the driving motor 41 is coaxially fixedly connected to a driving gear 42 meshing with the outer gear ring 40, and a plurality of driving blades 43 are fixedly connected to the inner wall of the outer gear ring 40.

[0029] The conveying mechanism 15 also includes a rotating cylinder 44 rotatably connected to the fixed column 16, the top outer wall of the rotating cylinder 44 is fixedly connected to the rotating disk 17, the bottom outer wall of the rotating cylinder 44 is fixedly connected to a worm gear 45, a worm 46 meshing with the worm gear 45 is rotatably connected to the body 14, one end of the worm 46 is coaxially fixedly connected to a bevel gear 47, and the upper end of the outer gear ring 40 is coaxially fixedly connected to a bevel gear ring 48 meshing with the bevel gear 47.

[0030] In this embodiment, the shell 1 to be welded is placed between the closed flip plates 19. At this time, the inner cavity of the flip plate 19 is octagonal, which can fit the octagonal shell 1 for positioning. At the same time, three groups of elastic sheets are provided on the inner wall of the flip plate 19. Only the two sides parallel to the opening and closing direction are not provided with elastic sheets to avoid the elastic sheets on both sides continuously clamping the shell 1 during the opening and closing process, affecting the downward output of the shell 1. The remaining surfaces are all provided with elastic sheets, so that after the flip plates 19 on both sides are closed, the six groups of elastic sheets on the opposite surfaces can symmetrically clamp the six surfaces of the shell 1 at the same time, thereby improving the stability of the fixation.

[0031] It is worth noting that the middle part of the elastic sheet is convex and can fit the outer wall of the shell 1. When squeezed by the outer wall of the shell 1, it pushes the sliding plates 31 on both sides to slide and compress the first spring 32. At the same time, there are buffer plates 50 and second springs 49 at the bottom of the shell 1 to support the positioning of the shell 1 inside the fixing ring 18, so that the bottom of the shell 1 can always be buffered and supported when assembling, welding and grinding the terminal parts, thereby increasing the resistance between the welding head 37 and the grinding head 38.

[0032] Start the drive motor 41 to drive the drive gear 42 to rotate, thereby rotating the outer gear ring 40 and the drive blade 43, and the outer gear ring 40 drives the bevel gear ring 48 to rotate, so that the bevel gear 47 drives the worm 46 to rotate, and the worm 46 drives the worm wheel 45 to rotate the rotating cylinder 44, and the rotating cylinder 44 drives the rotating disk 17 to drive the fixed tube to rotate, which can drive the shell 1 inside the flip plate 19 to rotate and transport. During the rotation of the sleeve tube 26, the guide rod 28 will be driven to slide in the guide groove 27. The height of the guide groove 27 close to the welding head 37 is lower, and there is a horizontal section. The height of the side away from the welding head 37 is the highest. The two sides are gradually inclined and guided, so that during the process of the guide rod 28 rotating one circle, the sleeve tube 26 will be driven to gradually move up to the highest point, and then gradually move down to the lowest point, and remain at the lowest point to rotate half a circle.

[0033] When the sleeve tube 26 moves upward, the sleeve tube 26 gradually releases the resistance to the side wall of the flip plate 19, and the flip plate 19 flips to both sides driven by the clockwork shaft. Since the inner wall of the bottom end of the sleeve tube 26 is designed with an arc-shaped chamfer, the flip plate 19 presents a relatively slow flipping state during the flipping process, until the sleeve tube 26 is completely moved to the upper side of the flip plate 19, the flip plate 19 opens to the maximum opening and closing angle, at which time the internal shell 1 can be output vertically downward, ensuring that the negative top cover sheet 4 and the terminal side after welding are output toward the upper end to avoid impact and wear of the terminal.

[0034] In the process of rotating the shell 1 driven by the rotating disk 17, the terminal structure needs to be assembled before the position close to the welding head 37. After reaching the bottom of the welding head 37, the electric telescopic rod 33 controls the lifting frame 34 to move downward, and the socket tube 35 sockets the top end of the shell 1. The driving disk 36 drives the welding head 37 and the grinding head 38 to rotate. The welding head 37 welds and fixes the upper side of the shell 1 to the negative top cover plate 4, and the grinding head 38 can synchronously extend and retract to grind the edge welding position, thereby improving operating efficiency. The dust generated by grinding will directly fall into the two sets of flip plates 19 at the bottom for collection, thereby reducing the dispersion of dust.

[0035] During the rotation of the outer gear ring 40, the driving blade 43 will be driven to rotate to generate a downward suction force, and the upper side of the driving blade 43 is opposite to the bottom of the flip plate 19 during the opening and closing process. At this time, the shell 1 will not slide out from the bottom, and the dust inside the flip plate 19 will be knocked down by the tilted flip plate 19 and the buffer plate 50, and transported to the collection box 39 with the suction of the driving blade 43. After being filtered by the exhaust filter 51, the dust is collected in the collection box 39 for storage, and the collection box 39 can be cleaned as needed.

[0036] It is worth noting that the driving motor 41 drives the driving gear 42 to rotate intermittently, so that the shell 1 switches to a set angle each time as the fixing ring 18 does, and then the shell 1 can be stably welded through the welding head 37. Due to the provision of the worm 46 and the worm wheel 45, the rotation switching of the rotating disk 17 is slower, and at the same time, the rotation speed of the driving blade 43 during the rotation process is also guaranteed, thereby improving the suction force. The worm wheel 45 needs to rotate multiple circles to complete the switching of the rotating disk 17 to the required angle, and this switching process happens to be when the flip plate 19 opens to output dust into the collection box 39. The structure is simple and ingenious, and effectively improves the welding and conveying efficiency between the shell 1 and the top cover.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An octagonal single-pass positive and negative electrode cover, characterized in that: include: A shell (1), wherein the cross section of the shell (1) is a regular octagon, the bottom of the shell (1) is fixedly connected to a positive electrode top cover (2), the upper end of the shell (1) is fixedly connected to a negative electrode top cover sheet (4), the bottom of the negative electrode top cover sheet (4) is fixedly connected to a negative electrode lower plastic (3) and an explosion-proof sheet (13), the negative electrode top cover sheet (4) is fixedly connected to a protective small sheet (12), a positive electrode column (7) and a negative electrode column (11), the bottoms of the positive electrode column (7) and the negative electrode column (11) are respectively fixedly connected to a leak-proof sealing ring (8), the positive electrode column (7) is fixedly connected to a positive electrode upper plastic (6), the upper side of the positive electrode upper plastic (6) is fixedly connected to a positive terminal (5), the negative electrode column (11) is fixedly connected to a negative electrode upper plastic (10), and the upper side of the negative electrode upper plastic (10) is fixedly connected to a negative terminal (9).

2. A welding device for welding the octagonal single-pass positive and negative electrode top cover according to claim 1, characterized in that: including the body (14); Also includes: A conveying mechanism (15), the conveying mechanism (15) comprising a fixed column (16) fixedly mounted on the body (14), the upper side of the fixed column (16) being rotatably connected to a rotating disk (17), a plurality of groups of fixed rings (18) being evenly and fixedly connected to the rotating disk (17), two groups of flip plates (19) being respectively provided below the plurality of groups of fixed rings (18), for fixing the shell (1) via the flip plates (19) and the fixed rings (18), and conveying the shell (1) via the rotating disk (17), and gradually controlling the flip plates (19) at the bottom to unfold after welding is completed, so as to output the welded shell (1) from the bottom, ensuring that the terminal side is outputted toward the upper side; A welding mechanism (20), the welding mechanism (20) being mounted on the fixing column (16) and used for welding and grinding the shell (1) and the negative electrode top cover sheet (4).

3. A welding device according to claim 2, characterized in that: The conveying mechanism (15) further comprises a rotating block (22) fixedly mounted on the upper side of the flip plate (19); the rotating block (22) is rotatably connected to the bottom surface of the fixed ring (18) via a spring shaft; a bottom plate (23) is fixedly connected to the bottom of the flip plate (19); the inner wall cross-section of the columnar frame structure formed by two groups of adjacent flip plates (19) is a regular octagon; an opening and closing member (24) for controlling the opening and closing state of the flip plate (19) according to the position of the fixed ring (18) is provided on the fixed column (16); and a fixing member (25) for stably clamping the octagonal shells (1) of different sizes is provided in the flip plate (19).

4. A welding device according to claim 3, characterized in that: The opening and closing member (24) comprises a sleeve tube (26) slidably connected to the outer wall of the fixing ring (18) in the vertical direction, the sleeve tube (26) slidably fits with the outer wall of the flip plate (19), the outer wall of the fixing column (16) is provided with a guide groove (27), the side surface of the sleeve tube (26) is fixedly connected with a guide rod (28) slidably fits with the inner wall of the guide groove (27), and the inner side of the bottom end of the sleeve tube (26) is designed with an arc-shaped chamfer.

5. A welding device according to claim 3, characterized in that: The fixing member (25) comprises three groups of elastic plates (29) mounted on the inner wall of the flip plate (19); the inner wall of the flip plate (19) is provided with three groups of sliding grooves (30); a sliding plate (31) is fixedly connected in the sliding groove (30); two ends of the elastic plate (29) are respectively fixedly connected to two groups of sliding plates (31) on the same straight line; and a first spring (32) fixedly connected to the sliding groove (30) is fixedly connected to the side surface of the sliding plate (31).

6. A welding device according to claim 2, characterized in that: The welding mechanism (20) comprises an electric telescopic rod (33) fixedly mounted in the fixed column (16); the telescopic end of the electric telescopic rod (33) is fixedly connected to a lifting frame (34); the bottom of the lifting frame (34) is fixedly connected to a sleeve (35); a driving disk (36) is rotatably connected in the sleeve (35); and a welding head (37) and a grinding head (38) are provided at the bottom of the driving disk (36).

7. A welding device according to claim 2, characterized in that: The machine body (14) further comprises a dust removal mechanism (21) mounted on the machine body (14), the dust removal mechanism (21) comprising a collection box (39) fixedly mounted on the machine body (14), the upper side of the collection box (39) being rotatably connected to an outer toothed ring (40), the bottom of the outer toothed ring (40) being in communication with the collection box (39), the upper side of the outer toothed ring (40) being opposite to the bottom of the flip plate (19) during the opening and closing process, the machine body (14) being fixedly connected to a drive motor (41), the output end of the drive motor (41) being coaxially fixedly connected to a drive gear (42) meshing with the outer toothed ring (40), and the inner wall of the outer toothed ring (40) being fixedly connected to a plurality of groups of drive blades (43).

8. A welding device according to claim 7, characterized in that: The conveying mechanism (15) further comprises a rotating cylinder (44) rotatably connected to the fixed column (16); the top outer wall of the rotating cylinder (44) is fixedly connected to the rotating disk (17); the bottom outer wall of the rotating cylinder (44) is fixedly connected to a worm gear (45); a worm (46) meshing with the worm gear (45) is rotatably connected to the machine body (14); one end of the worm (46) is coaxially fixedly connected to a bevel gear (47); and the upper end of the outer gear ring (40) is coaxially fixedly connected to a bevel gear ring (48) meshing with the bevel gear (47).

9. A welding device according to claim 3, characterized in that: A second spring (49) is fixedly connected to the bottom plate (23), and a buffer plate (50) is fixedly connected to the upper side of the second spring (49) and is slidably connected to the inner wall of the flip plate (19).

10. A welding device according to claim 7, characterized in that: An exhaust filter (51) is fixedly connected to the side of the collection box (39).

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