Cylindrical battery cell production line and production process thereof

Abstract

A cylindrical battery cell production line and a production process thereof. A first production workstation, a second production workstation, a third production workstation, and a fourth production workstation are formed in the cylindrical battery cell production line (100), and the cylindrical battery cell production line (100) comprises a transportation line, a first production apparatus (1), a second production apparatus (2), a third production apparatus (3), and a fourth production apparatus (4). The transportation line sequentially passes through the first production workstation, the second production workstation, the third production workstation, and the fourth production workstation, and is used for conveying a semi-finished battery cell product. The first production apparatus (1) is arranged at the first production workstation and is used for flattening a battery cell and welding a positive current collecting disc, the second production apparatus (2) is arranged at the second production workstation and is used for sequentially penetration-welding a positive electrode, welding a current collecting disc sidewall, and welding a negative current collecting disc after the battery cell is put into a casing, the third production apparatus (3) is arranged at the third production workstation and is used for welding a negative electrode cover plate and the casing, and the fourth production apparatus (4) is arranged at the fourth production workstation and is used for cleaning a liquid injection hole and welding a sealing pin onto the liquid injection hole.

Description

Cylindrical battery cell production line and its production process

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202410388843.7 filed on April 1, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of cylindrical battery cell production, and in particular to a cylindrical battery cell production line and a production process thereof. Background Art

[0004] The widespread use of batteries is driving higher demands on battery manufacturing efficiency. Traditional cylindrical battery production lines suffer from issues such as insufficient equipment precision, complex operations, low production efficiency, and inconsistent product quality. These issues lead to high battery production costs and long production cycles, while also impacting battery performance and lifespan.

[0005] Summary of the Invention

[0006] The main purpose of this application is to propose a cylindrical battery cell production line and its production process, aiming to solve the problems of existing cylindrical battery production lines that lead to high battery production costs and long cycles, while also affecting battery performance and service life.

[0007] To achieve the above objectives, the present application proposes a cylindrical battery cell production line, wherein the cylindrical battery cell production line is formed with a first production station, a second production station, a third production station, and a fourth production station, and the cylindrical battery cell production line includes:

[0008] At least one transport line passes through the first production station, the second production station, the third production station and the fourth production station in sequence, for transporting semi-finished products of the battery cells;

[0009] A first production device, provided at the first production station, for leveling the battery cells and welding the positive collector plates;

[0010] The second production device is provided at the second production station, and is used to sequentially perform positive electrode penetration welding, current collector side wall welding, and negative current collector welding after the battery cell is placed in the shell;

[0011] A third production device is provided at the third production station and is used for welding the negative electrode cover and the shell of the battery cell; and

[0012] The fourth production device is arranged at the fourth production station and is used for cleaning the battery cell injection hole and welding the sealing nail to the battery cell injection hole.

[0013] In one embodiment, the first production device is formed with a flattening station, a positive collector plate welding station, a laminating station, and a trimming station, and the first production device includes:

[0014] Positive collector plate feeding unit, used to deliver the positive collector plate to the positive collector plate welding station

[0015] The first battery cell conveyor line passes through the flattening station, the positive collector plate welding station, the encapsulation station and the edge finishing station in sequence;

[0016] A flattening unit is provided at the flattening station and is used to perform a four-stage flattening process on the two poles of the battery cell at the flattening station;

[0017] A positive collector disc welding unit is provided at the positive collector disc welding station, comprising a plurality of pressing toolings, a battery cell transfer tooling, a positive collector disc feeding tooling and a positive collector disc welding structure. The pressing tooling is used to place the battery cell and the positive collector disc so that the positive collector disc is pressed onto the end of the battery cell. The battery cell transfer tooling is switchable between the first battery cell conveyor line and the plurality of pressing toolings to transfer the battery cells before welding on the first battery cell conveyor line to each of the pressing toolings, and to transfer the battery cells welded on the pressing tooling back to the first battery cell conveyor line. The positive collector disc feeding tooling is used to provide positive collector discs to the plurality of pressing toolings. The positive collector disc welding structure is switchable between the plurality of pressing toolings to sequentially weld the positive collector discs pressed on each of the pressing toolings to the battery cells that have been flattened.

[0018] A coating unit is provided at the coating station, and is used to coat the positive electrode and the positive current collecting disk of the battery cell at the coating station with coating; and

[0019] The edge trimming unit is provided at the edge trimming station and is used for trimming the rubber coating of the positive electrode of the battery cell at the edge trimming station to the positive current collecting plate.

[0020] In one embodiment, the second production device is formed with a shell assembly station, a positive electrode penetration welding station, a current collecting plate side wall welding station, and a negative current collecting plate welding station, and the second production device includes:

[0021] Shell conveyor line, used to convey the shells of battery cells to the shell assembly station;

[0022] A second cell conveying line sequentially passes through the shell assembly station, the positive electrode penetration welding station, the collector plate side wall welding station, and the negative collector plate welding station to convey the cells;

[0023] A shell assembly unit is provided at the shell assembly station, and is used to push the battery cell, after flattening the battery cell and welding the positive collector plate, into the shell until the bottom of the shell;

[0024] A positive electrode penetration welding unit is provided at the positive electrode penetration welding station and is used to weld the positive current collecting plate and the bottom of the shell into one;

[0025] The collecting plate side wall welding unit is arranged at the collecting plate side wall welding station, and includes a guide assembly, a battery cell feeding mechanism, a negative collecting plate feeding mechanism, a driving mechanism and a negative electrode shell welding assembly. The guide assembly includes two guide members arranged opposite to each other, and the two guide members are provided with notch grooves on the opposite sides. The two guide members are relatively movable so that when they approach each other to a preset position, the corresponding two notch grooves define a stepped hole. The inner wall of the stepped hole is formed with a step surface, and the stepped hole has a first hole section facing the step surface and a second hole section away from the step surface. The radial size of the first hole section is gradually reduced in the direction toward the second hole section, and the step surface is used to support the end of the shell. The inner wall of the second hole section is used to abut against the outer wall of the shell, and the first hole section is used to introduce the negative current collecting disc into the shell so that the flange of the negative current collecting disc abuts against the inner wall of the shell, and the battery cell feeding mechanism is movably arranged, including a bearing assembly and an end limit assembly, the bearing assembly is used to support the battery cell, and the end limit assembly is used to abut against one axial end of the battery cell, and the negative current collecting disc feeding mechanism is movably arranged, including a first negative current collecting disc picking portion for picking up the negative current collecting disc and assembling the negative current collecting disc to the shell, the driving mechanism drives the battery cell feeding mechanism and the negative current collecting disc feeding mechanism to move, and the negative electrode shell welding assembly is used to weld the assembled negative current collecting disc and the shell; and,

[0026] The negative current collecting plate welding unit is provided at the negative current collecting plate welding station and is used for welding the negative current collecting plate at the negative current collecting plate welding station to the negative electrode of the battery cell.

[0027] In one embodiment, the third production device is formed with a cover plate loading station, a pre-spot welding station, a cover plate welding station, a post-weld cleaning station, and a post-weld inspection station, and the third production device includes:

[0028] The AGV automatically docks the buffer conveyor line, which is set corresponding to the cover plate loading station to convey the cover plates of the battery cells to the pre-spot welding station;

[0029] A third battery cell conveyor line sequentially passes through the cover plate loading station, the pre-spot welding station, the cover plate welding station, the post-weld cleaning station, and the post-weld inspection station to convey battery cells that have completed negative collector plate welding;

[0030] A pre-spot welding mechanism is provided at the pre-spot welding station, for pre-spot welding the negative electrode cover plate and the shell of the battery cell at the pre-spot welding station;

[0031] The cover plate welding mechanism includes a transfer structure, a cover plate positioning structure, and a cover plate welding structure. The transfer structure has a movable stroke between the cover plate feeding station and the cover plate welding station for transferring the battery cell to the cover plate welding station. The cover plate positioning structure is used to rotate and position the battery cell at the cover plate welding station. The cover plate welding structure is used to weld the battery cell shell and the negative electrode cover plate of the battery cell that has completed the cover plate pre-spot welding at the cover plate welding station into one body.

[0032] a cleaning mechanism, provided at the post-weld cleaning station, for cleaning the battery cells at the post-weld cleaning station; and

[0033] The detection mechanism is arranged at the post-weld detection station and is used to detect the welds of the battery cells at the post-weld detection station.

[0034] In one embodiment, the fourth production device is formed with a cleaning station, a nail supply station, a sealing nail welding station, and a sealing nail welding station, and the fourth production device includes:

[0035] a fourth battery cell conveying line, which sequentially passes through the cleaning station, the sealing nail welding station, and the sealing nail welding station, and is used to convey battery cells with completed cover plate welding;

[0036] A cleaning assembly, comprising a laser cleaning device, wherein the laser cleaning device is provided corresponding to the cleaning station to clean the injection hole of the battery cell to be cleaned at the cleaning station after the cover plate welding is completed;

[0037] A battery cell carrier, used to carry the battery cells to the sealing nail welding station;

[0038] The nail feeding mechanism has a picking portion for picking up the sealing nails from the sealing nail feeding station;

[0039] A first visual positioning mechanism is located between the nailing mechanism and the sealing nail waiting welding station, and is used to collect the first position of the sealing nail relative to the picking part;

[0040] A second visual positioning mechanism is located on one side of the sealing nail welding station along the third direction, and is used to collect the second position of the liquid injection hole on the battery cell; and

[0041] A sealing pin welding mechanism is provided at the sealing pin welding station and is used to weld the sealing pin into the liquid injection hole of the battery cell;

[0042] Wherein, the nailing mechanism is used to move the sealing nail from the first visual positioning mechanism to the sealing nail welding station according to the first position and the second position.

[0043] The present application also proposes a production process for cylindrical battery cells. Based on the above-mentioned cylindrical battery cell production line, the production process for cylindrical battery cells includes the following steps:

[0044] The battery cell is flattened by a first production device, and a positive collector is welded to the positive electrode of the battery cell;

[0045] The second production device is used to place the battery cells that have been flattened and the positive collector plate welded into the shell, and then the positive electrode penetration welding, collector plate side wall welding and negative collector plate welding are carried out in sequence;

[0046] The shell and negative electrode cover of the battery cell with the negative current collector welded are completed by welding with the third production device;

[0047] The fourth production device is used to clean the liquid injection hole of the battery cell after the cover plate welding is completed, and the sealing nail is welded to the liquid injection hole of the battery cell.

[0048] In one embodiment, the step of flattening the battery cell using the first production device and welding the positive current collecting plate to the positive electrode of the battery cell includes:

[0049] Incoming materials are put on line, the battery cells are put on line to the first battery cell conveyor line, and the positive current collecting tray is loaded onto the positive current collecting tray feeding unit;

[0050] The battery cell is leveled, and the positive and negative poles of the battery cell are leveled in four stages through the leveling unit;

[0051] Positive collector plate welding: welding the positive collector plate welding unit collector plate to the positive electrode of the battery cell after the battery cell is flattened by the positive collector plate welding unit;

[0052] Positive electrode encapsulation: the positive electrode and the positive current collecting plate of the battery cell that has completed the positive current collecting plate welding are encapsulated with rubber by the encapsulation unit;

[0053] Positive electrode edge trimming: The edge trimming unit trims the glue-coated positive electrode of the battery cell to the positive current collector after the glue-coating process is completed;

[0054] The battery cells are unloaded from the winding conveyor line after trimming.

[0055] In one embodiment, the steps of sequentially performing positive electrode penetration welding, current collecting plate side wall welding, and negative current collecting plate welding after placing the battery cell into the shell by the second production device include:

[0056] The battery cell is put into the shell. The battery cell with the flattened battery cell and the positive collector plate welded is pushed into the shell until it reaches the bottom of the shell through the shell assembly unit;

[0057] Positive electrode penetration welding: the positive current collecting plate and the bottom of the shell are welded together through the positive electrode penetration welding unit;

[0058] Collector plate side wall welding, the negative collector plate and the shell are welded into one body through the collector plate side wall welding unit;

[0059] Negative current collecting plate welding: the negative current collecting plate is welded to the negative electrode of the battery cell with the current collecting plate side wall welding completed by the negative current collecting plate welding unit.

[0060] In one embodiment, the step of welding the negative electrode cover plate and the shell of the battery cell by the third production device includes:

[0061] Cover plate pre-spot welding: pre-spot welding the negative electrode cover plate and shell of the battery cell through the pre-spot welding mechanism;

[0062] Cover plate welding: the cover plate welding mechanism is used to weld the battery cells at the cover plate welding station;

[0063] Weld seam cleaning: the cleaning mechanism is used to clean the weld seams of the battery cells where the cover plate welding is completed at the post-weld cleaning station;

[0064] Weld seam inspection: The inspection mechanism is used to inspect the weld seams of the battery cells that have completed weld seam cleaning at the post-weld inspection station.

[0065] In one embodiment, the step of cleaning the battery cell liquid injection hole and welding the sealing pin to the battery cell liquid injection hole by the fourth production device includes:

[0066] Battery cell cleaning: Use a laser cleaning device to clean the injection holes of the battery cells that have completed cover plate welding;

[0067] Sealing pin positioning: the specific positions of the sealing pin and the battery cell injection hole are determined by the first and second visual positioning mechanisms, and the sealing pin is installed into the battery cell injection hole by the nailing mechanism;

[0068] Sealing pin welding: The sealing pin is welded to the liquid injection hole of the cleaned battery cell through a sealing pin welding mechanism.

[0069] In the technical solution provided in the present application, the first production device, the second production device, the third production device and the fourth production device are arranged in sequence along the conveyor line. The conveyor line can connect multiple production devices in series into one. Multiple production devices successively perform battery cell flattening, positive collector plate welding, battery cell shell insertion, positive electrode penetration welding, collector plate side wall welding, negative collector plate welding, battery cell negative electrode cover plate welding, battery cell injection hole cleaning and sealing nail welding to realize the automation, intelligence and efficient operation of the cylindrical battery cell production line, and realize the rapid and precise production of cylindrical battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0071] FIG1 is a schematic diagram of the cylindrical battery cell production process of the cylindrical battery cell production line provided by the present application;

[0072] FIG2 is a structural layout diagram of the first production device in FIG1 ;

[0073] FIG3 is a perspective schematic diagram of the positive collector plate welding unit in FIG2 ;

[0074] FIG4 is a structural layout diagram of the second production device in FIG1 ;

[0075] FIG5 is a perspective schematic diagram of the side wall welding unit of the current collecting plate in FIG4 ;

[0076] FIG6 is a structural layout diagram of the third production device in FIG1;

[0077] FIG7 is a perspective schematic diagram of the cover plate welding mechanism in FIG6 ;

[0078] FIG8 is a structural layout diagram of the fourth production device in FIG1;

[0079] FIG9 is a perspective schematic diagram of the nailing mechanism and the visual positioning mechanism in FIG8 ;

[0080] FIG10 is a schematic flow chart of the production process of cylindrical battery cells provided in this application.

[0081] Description of Figure Numbers:

[0082] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0084] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0085] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0086] Currently, traditional cylindrical battery production lines have problems such as insufficient equipment precision, complex operations, low production efficiency, and unstable product quality. These problems lead to high battery production costs and long production cycles, while also affecting battery performance and service life, resulting in high production costs.

[0087] In order to solve the above problems, the present application provides a cylindrical battery cell production line 100. Figures 1 to 9 are specific embodiments of the cylindrical battery cell production line provided by the present application.

[0088] Please refer to FIG1 , the cylindrical battery cell production line 100 is formed with a first production station, a second production station, a third production station and a fourth production station. The cylindrical battery cell production line 100 includes at least one transport line, a first production device 1, a second production device 2, a third production device 3 and a fourth production device 4. In one embodiment, the transport line is a magnetic levitation transport line, and the magnetic levitation transport line passes through the first production station, the second production station, the third production station and the fourth production station in sequence. Used to transport semi-finished products of battery cells, the first production device 1 is arranged at the first production station, for flattening the battery cells and welding the positive collector plate, the second production device 2 is arranged at the second production station, for placing the battery cells into the shell and then performing positive electrode penetration welding, collector plate side wall welding and negative collector plate welding in sequence, the third production device 3 is arranged at the third production station, for welding the negative electrode cover and shell of the battery cell, the fourth production device 4 is arranged at the fourth production station, for cleaning the battery cell injection hole and welding the sealing nail to the battery cell injection hole.

[0089] In the technical solution provided in the present application, the first production device 1, the second production device 2, the third production device 3 and the fourth production device 4 are arranged in sequence along the magnetic levitation transport line. The magnetic levitation transport line can connect multiple production devices in series into one. Multiple production devices successively perform battery cell flattening, positive collector plate welding, battery cell shell insertion, positive electrode penetration welding, collector plate side wall welding, negative collector plate welding, battery cell negative electrode cover plate welding, battery cell injection hole cleaning and sealing nail welding to realize the automation, intelligence and efficient operation of the cylindrical battery cell production line 100, and realize the rapid and precise production of cylindrical battery cells.

[0090] It can be understood that in one embodiment of the present application, there is only one magnetic levitation transport line, and the magnetic levitation transport line is set to pass through the first production station, the second production station, the third production station and the fourth production station to transport semi-finished products of the battery cells.

[0091] In another embodiment of the present application, there are two magnetic levitation transport lines, which are arranged at intervals and can realize cross-transportation between each other to avoid the entire line from being shut down when one of the magnetic levitation transport lines or production equipment fails.

[0092] It should be noted that, in the present application, the cylindrical battery cell production line 100 also includes a front helium inspection device and a tape coding device. The front helium inspection device is located on the magnetic levitation transport line and is located after the third production device 3. The front helium inspection device is used to inject helium into the battery cell and perform air leakage detection. The tape coding device is located on the magnetic levitation transport line and is located after the fourth production device 4. The tape coding device is used to tape code the battery cell.

[0093] Furthermore, the first production device 1 is formed with a flattening station, a positive current collecting plate welding station, a glue wrapping station and a trimming station. The first production device 1 includes a positive current collecting plate feeding unit 11, a first battery cell conveying line 12, a flattening unit 13, a positive current collecting plate welding unit 14, a glue wrapping unit 15 and a trimming unit 16. The positive current collecting plate feeding unit 11 is used to convey the positive current collecting plate to the positive current collecting plate welding station. The first battery cell conveying line 12 passes through the flattening station, the positive current collecting plate welding station, the glue wrapping station and the trimming station in sequence. The flattening unit 13 is arranged at the flattening station for performing four-stage flattening processing on the two poles of the battery cell at the flattening station. The positive current collecting plate welding unit 14 is arranged at the positive current collecting plate welding station, including multiple placement structures, transfer components, pressing components and welding components. The multiple placement structures are used to place the battery cells respectively, and the transfer components The parts include a cell transfer tooling 142 and a positive current collecting tray transfer tooling, the cell transfer tooling 142 is used to transfer cells between the first cell conveyor line 12 and the multiple placement structures, the positive current collecting tray transfer tooling is used to transfer the positive current collecting tray from the positive current collecting tray feeding unit 11 to the multiple placement structures, so that the positive current collecting tray is opposite to the positive pole of the incoming cell, the clamping assembly is used to align and press the positive current collecting tray in the placement structure with the positive pole of the incoming cell, the welding assembly can be switched between the multiple placement structures to weld the positive current collecting trays pressed on the multiple placement structures and the cell that has been flattened in turn, the encapsulation unit 15 is provided at the encapsulation station, for encapsulating the positive pole and the positive current collecting tray of the cell at the encapsulation station with encapsulation, and the edge finishing unit 16 is provided at the edge finishing station, for edge finishing the encapsulation of the positive pole of the cell at the edge finishing station to the positive current collecting tray.

[0094] It can be understood that the flattening unit 13 can flatten the end of the battery cell, thereby improving the flatness of the end surface of the battery cell, which is convenient for welding the positive collector plate welding unit 14; the first battery cell conveyor line 12 can continuously convey the battery cells, and under the back-and-forth transport action of the battery cell transfer tooling 142 between the first battery cell conveyor line 12 and the multiple pressing tooling 141, the battery cells before welding can be continuously transported to each of the pressing tooling 141, and the battery cells after welding can also be transported back to the first battery cell conveyor line 12 one after another. The first battery cell conveyor line 12 does not need to stop and wait, and its transport efficiency is improved. At the same time, since the positive collector plate welding structure 144 can It can switch positions between multiple pressing tools 141. Therefore, after the positive collecting plate welding structure 144 completes welding a group of battery cells at one pressing tool 141, it can immediately move to another pressing tool 141 to continuously weld another group of battery cells, which only consumes a small amount of transfer time, greatly shortens the waiting time of the positive collecting plate welding structure 144, and improves the laser utilization efficiency; the glue wrapping unit 15 can wrap the welding end of the battery cell with glue, and the edge finishing unit 16 can wrap the glue wrap of the welding end, thereby playing the role of bonding the positive collecting plate welding unit 14 and the welding end.

[0095] In addition, in other embodiments of the present application, the first production device 1 also includes a post-flattening detection unit, a post-welding detection unit, a glue coating detection unit, an edge trimming detection unit and a first defective unloading unit. The post-flattening detection unit can identify and detect the battery cells after flattening to identify unqualified battery cells, thereby passing the unqualified battery cells to the first defective unloading unit for offline processing. The post-welding detection unit can identify and detect the battery cells after welding to identify unqualified battery cells with substandard welding quality, thereby passing the unqualified battery cells to the first defective unloading unit for offline processing. The glue coating detection unit and the edge trimming detection unit respectively detect the glue coating quality and the edge trimming quality to identify unqualified battery cells with substandard glue coating quality and edge trimming quality, thereby passing the unqualified battery cells to the first defective unloading unit for offline processing.

[0096] It should be noted that the first battery cell conveyor line 12 can have many structural forms, for example, it can be in the form of a belt conveyor line, or it can be in the form of a magnetic levitation conveyor line. It can be understood that the magnetic levitation conveyor line has the advantages of fast and precise positioning, and the embodiment of the present application does not limit its specific structure; due to the existence of the battery cell transfer tooling 142, the first battery cell conveyor line 12 and the multiple pressing tooling 141 can have many relative positions, which can be set far apart or adjacent to each other, as long as the conveying efficiency of the battery cell transfer tooling 142 can meet the welding rhythm of the positive collector plate welding structure 144, this embodiment does not limit this; the function of the pressing tooling 141 is to press the positive collector plate and the end of the battery cell together to facilitate the positive collector plate welding structure 144 is welded thereon, and there are many structural forms of the pressing tooling 141, which are not limited in this embodiment; there are many structural forms of the battery cell transfer tooling 142, for example, a multi-axis robotic arm can be used in combination with a clamp or a suction cup to complete the transfer of the battery cell, or a linear motion module can be used in combination with a clamp or a suction cup to complete the transfer of the battery cell, and this application does not limit this; there are also many structural forms of the positive collector plate feeding tooling 143, as long as it can complete the action of providing positive collector plates to multiple pressing toolings 141, and this embodiment does not limit this; the specific structure of the positive collector plate welding structure 144 can be in the form of laser welding, and its movement form can be completed by linear motor drive, or it can be completed by other linear drive modules, and this embodiment does not limit this.

[0097] The battery cell transfer tooling 142 can adopt a one-way round-trip transfer form, but this transfer form can only complete the loading of battery cells from the first battery cell conveyor line 12 to the pressing tooling 141, or unloading from the pressing tooling 141 to the first battery cell conveyor line 12 in a single trip. Therefore, its transfer efficiency is limited, and it is difficult to meet the efficient operation requirements of the positive collecting plate welding structure 144. In view of this, in some embodiments, the first battery cell conveyor line 12 has a loading conveying section and a unloading conveying section; the battery cell transfer tooling 142 includes a loading picking part 441 and a unloading picking part 441, and the loading picking part 441 moves between the loading conveying section and multiple pressing tooling 141 to pick up the battery cells in the loading conveying section in turn to multiple pressing tooling 141; the unloading picking part 441 moves between multiple pressing tooling 141 and the unloading conveying section to pick up the battery cells in multiple pressing tooling 141 in turn to the unloading conveying section.

[0098] It should be noted that there are many structural forms of the loading and picking up part 441 and the unloading and picking up part 441, for example, they can be in the form of a clamp or a negative pressure nozzle. This embodiment does not limit this, as long as they can stably pick up the battery cells.

[0099] According to the above technical solution, the battery cell transfer tooling 142 is set to the form of a loading and picking part 441 and a unloading and picking part 441 in coordination with each other, which can simultaneously complete the loading operation of the incoming battery cells before welding and the unloading operation of the battery cells after welding. The transfer efficiency of the battery cells is greatly improved, and it can adapt to the efficient operation rhythm of the positive collecting plate welding structure 144.

[0100] Specifically, in some embodiments, the loading and conveying section, multiple pressing tools 141 and the unloading and conveying section are arranged along the first direction; the battery cell transfer tool 142 includes a first double-acting linear motor, which is arranged corresponding to the multiple pressing tools 141 and has two first movable seats that move along the first direction; the loading and picking part 441 and the unloading and picking part 441 are respectively arranged on the two first movable seats, and are respectively arranged corresponding to the loading and conveying section and the unloading and conveying section.

[0101] It should be noted that the first direction is usually set to a direction within a horizontal plane.

[0102] According to the above technical solution, the battery cell transfer tooling 142 is set in the form of a first double-acting linear motor, which can drive the loading and picking part 441 and the unloading and picking part 441 to move smoothly and efficiently, thereby ensuring the transfer efficiency of the battery cells. At the same time, since the loading and conveying section, multiple pressing tooling 141 and the unloading and conveying section are arranged along the first direction, and the first double-acting linear motor is also driven and set along the first direction, the space occupied by the positive collecting plate welding production line is relatively small.

[0103] In some embodiments, the pressing tool 141 includes a placing portion and a holding portion opposite to each other along the second direction to form a pressing gap therebetween. The placing portion is used to place the battery cell along the second direction, and the holding portion is used to grab the positive current collector and is movable along the second direction. The holding portion can press the positive current collector and the end of the battery cell in the pressing gap during its movable stroke; the positive current collector feeding tool 143 is used to provide the positive current collector to the holding portion; the battery cell transfer tool 142 is used to place the battery cell on the placing portion or pick up the battery cell from the placing portion.

[0104] It should be noted that the second direction is usually set as another direction in the horizontal plane, which is set at an angle to the first direction; the placement portion is used to place the battery cell, so a recess adapted to the shape of the battery cell is usually formed thereon to limit the battery cell; the holding portion is used to grab the positive current collector plate so that the positive current collector plate after placement is facing the end of the battery cell. The way of placing the positive current collector plate can be in the form of clamping the positive current collector plate or in the form of sucking the positive current collector plate, but it should be considered that it cannot affect the welding of the positive collector plate by the positive collector plate welding structure 144.

[0105] According to the above technical solution, the size of the pressing gap can be changed by the movement of the pressing part along the second direction, thereby facilitating the positive collecting disc feeding tooling 143 to extend into the pressing gap and feed the material to the pressing part. The movement of the positive collecting disc feeding tooling 143 can play a role of giving way. After the positive collecting disc feeding tooling 143 completes feeding and exits the pressing gap, the pressing part can continue to move toward the placement part, thereby pressing the positive collecting disc to the end of the battery cell in the placement part. The movable structural form of this pressing part is simple and efficient.

[0106] Furthermore, in some embodiments, the positive collecting disc feeding tooling 143 includes a flipping and picking portion 441 provided corresponding to the pressing tooling 141, and the flipping and picking portion 441 is flipped along the axis in the first direction so as to be able to enter the pressing gap during its flipping stroke; the pressing portion can be docked with the flipping and picking portion 441 within its active stroke to receive the positive collecting disc from the flipping and picking portion 441.

[0107] It should be noted that after the positive collecting tray is loaded onto the positive collecting tray feeding tooling 143, it is usually in a horizontal position, and after the positive collecting tray is fed to the holding part, it is usually in a vertical position. Therefore, the loading process of the positive collecting tray is usually a process of converting from a horizontal position to a vertical position, so it needs to be flipped, and the role of the flipping picking part 441 is in this regard. The specific form of the flipping picking part 441 can be a clamp or a negative pressure suction nozzle, and this embodiment does not limit this.

[0108] According to the above technical solution, the flipping and picking part 441 is used to convert the horizontally placed positive collecting disk into an upright position, and the holding part moves back and forth along the second direction. On the one hand, it can receive the positive collecting disk from the flipping and picking part 441, and on the other hand, it can make room for the movement of the flipping and picking part 441, thereby ensuring that the structure of the pressing tooling 141 is more compact while avoiding interference with the movement of the flipping and picking part 441.

[0109] Specifically, in some embodiments, the positive collecting tray feeding tooling 143 also includes a feeding structure, multiple transition structures and multiple transfer structures. The feeding structure is used to provide the positive collecting tray. The transition structure has a transition placement portion corresponding to the flipping picking portion 441. The flipping picking portion 441 can contact the transition placement portion during its flipping stroke to pick up the positive collecting tray in the transition placement portion. The transfer structure is used to move between the feeding structure and the corresponding transition structure to transfer the positive collecting tray to the corresponding transition placement portion.

[0110] It should be noted that the transition placement portion is aligned with the flipping and picking portion 441 for transitionally placing the positive collecting disc. There are various structural forms as long as they can play a role in positioning the positive collecting disc.

[0111] According to the above technical solution, the transfer structure can horizontally transfer the positive collecting disk on the distant feeding structure to the transition placement part, and the flipping picking part 441 can flip the positive collecting disk on the transition placement part to the pressing gap. The transition placement part plays a transition role between the horizontal transfer and the flipping transfer of the positive collecting disk. The action form of the positive collecting disk feeding tooling 143 is simple and efficient.

[0112] More specifically, in some embodiments, the placement portion and the pressing portion correspond one-to-one to form a placement and pressing group, and multiple placement and pressing groups are arranged in one pressing tool 141 and arranged along the first direction; the flipping and picking portion 441 corresponds one-to-one to the transition placement portion to form a transition flipping group, and multiple transition flipping groups are arranged corresponding to the placement and pressing group; the feeding structure includes a variable distance mechanism, and the variable distance mechanism has multiple variable distance positioning portions, and the variable distance positioning portions are used to place the positive collecting disk; the transfer structure has a transfer picking portion 441 corresponding to multiple transition placement portions, and within the active range of the transfer structure, the multiple transfer picking portions 441 can transfer the positive collecting disks on the corresponding multiple variable distance positioning portions to multiple transition placement portions.

[0113] It should be noted that, for the above solution, the battery cell transfer tooling 142 can also use multiple loading and picking parts 441 to load multiple placement and pressing groups at the same time, or use a single loading and picking part 441 to load each placement and pressing group one by one.

[0114] According to the above technical solution, the spacing between the multiple variable-pitch positioning parts of the variable-pitch mechanism after the pitch is changed is equivalent to the spacing between two adjacent placement and pressing groups and two adjacent transition flipping groups. Its function is to conveniently receive multiple incoming positive collecting discs and position them to meet the spacing requirements of multiple placement and pressing groups, so that multiple positive collecting discs can be loaded at the same time, and then multiple positive collecting discs can be pressed with battery cells at the same time, thereby improving the pressing efficiency of battery cells and positive collecting discs.

[0115] In other embodiments, the pressing tool 141 further includes a pushing portion, which is opposite to the holding portion in the second direction so that the placement portion is located therebetween, and the pushing portion is movable in the second direction to push the battery cell to the holding portion.

[0116] According to the above technical solution, after the pressing part receives and grabs the positive current collecting disc from the positive current collecting disc feeding tooling 143, the pushing part can immediately push the battery cell close to the pressing part, so that the battery cell and the positive current collecting disc are pressed together, thereby improving the pressing efficiency.

[0117] It is worth mentioning that after the battery cell is transferred to the placement portion, it is required to remain concentric with the positive collector disk on the pressing portion, and the diameters of different types of battery cells are different. Therefore, some types of battery cells may not be able to maintain concentric alignment and pressing with the positive collector disk, thereby limiting the scope of application of the positive collector disk welding unit 14. In view of this, in some embodiments, the pressing tool 141 also includes a centering clamping mechanism arranged in the pressing gap, and the centering clamping mechanism includes at least three centering clamping parts, and at least three centering clamping parts are distributed along the circumference of the pressing portion and are movable along the radial direction of the pressing portion to perform centering pressing on the battery cell inserted therein.

[0118] It should be noted that the centering clamping mechanism can be fixedly arranged in the pressing gap, or can be arranged in the pressing gap as the pressing part moves, and this is not limited to this in the present embodiment; there can be multiple driving methods for at least three centering clamping parts, for example, they can be driven to move separately by three driving cylinders, or they can be driven in other forms, and this is not limited to this in the present embodiment; since the centering clamping mechanism is in the pressing gap, therefore, in the process of the pushing part pushing the battery cell toward the pressing part, the battery cell can extend between the at least three centering clamping parts, and in the moving stroke of the at least three centering clamping parts, the battery cell can be positioned to a position concentric with the positive collecting plate.

[0119] According to the above technical solution, the three centering clamping parts can position any type of battery cell to a position concentric with the positive collecting disk on the pressing part, greatly improving the applicability of the pressing tool 141 and making it adaptable to different types of battery cells.

[0120] Specifically, in some embodiments, the centering clamping mechanism also includes a mounting seat, two hinged parts and a driving part, and the mounting seat is fixed relative to the pressing part; the two hinged parts are hingedly arranged on the mounting seat along the axis in the second direction, and are opposite to each other along the first direction, and the two ends of the hinged part are respectively arranged as the driving end and the driven end, and the two driven ends are arranged close to the pressing part; the driving part is arranged between the two driving ends and is movable along the third direction, and the driving part can squeeze the two driving ends away from each other within its movable stroke close to the pressing gap, so as to drive the two driven ends closer to each other; at least three centering clamping parts are respectively arranged on the driving part and the two driven ends.

[0121] It should be noted that the first direction, the second direction and the third direction are arranged at angles with each other. It should be understood that the first direction and the third direction belong to different radial directions of the pressing part; the fixed arrangement of the mounting seat and the pressing part means that the centering clamping mechanism can move with the pressing part; the middle part of the hinged part is hinged to the mounting seat, so that a driving end and a driven end can be formed at both ends respectively; the driving part can squeeze the two driving ends away from each other within its stroke close to the pressing gap, and based on the lever principle, the two driven ends approach each other. At this time, the three centering clamping parts respectively arranged on the driving part and the two driven ends approach each other along the radial direction of the pressing part, thereby completing the centering clamping of the battery cell.

[0122] According to the above technical solution, the three centering clamping parts can be driven to move by the action of one driving part, which reduces the number of driving sources, simplifies the structure of the centering clamping mechanism, and reduces the driving cost.

[0123] More specifically, in some embodiments, the two driving ends still maintain a tendency to approach each other under the reset drive of the reset part. With such an arrangement, when the driving part is away from the pressing gap, the two driving ends can still approach each other, thereby driving the two driven ends to move away from each other, that is, realizing the mutual distance between the three centering clamping parts, thereby releasing the centering clamping of the battery cell.

[0124] It should be noted that the reset portion includes many structures, such as a torsion spring provided on the rotating shaft of the hinge portion, or a tension spring connecting the two driving ends.

[0125] More specifically, in other embodiments, at least three centering clamping parts are arranged to rotate along the axis located in the second direction. With this arrangement, the centering clamping parts can achieve the purpose of unloading force by rotating themselves during the contact process with the battery cell, so as to avoid the centering clamping parts scratching the battery cell.

[0126] In some embodiments, the pressing tool 141 includes a positive collector disc clamping mechanism, which includes a pressing seat and a plurality of limit clamping parts. The pressing seat corresponds to the placement part and is movably arranged along the second direction. A guide part is formed on the pressing seat, and the guide part is arranged circumferentially around the axis of the second direction to form a clamping cavity therebetween, and the clamping cavity is used for the positive collector disc to extend into; a plurality of limit clamping parts are arranged on the circumferential side of the guide part and are movable radially along the guide part, and the limit clamping part can extend into the clamping cavity within its movable stroke to clamp the positive collector disc; wherein, the pressing part includes a pressing seat.

[0127] It should be noted that the guiding part can be arranged in a continuous and surrounding manner or in a segmented and surrounding manner; there can be various driving methods for multiple limit clamping parts, for example, they can be driven to move separately by multiple driving cylinders, or two of the limit clamping parts can be driven to move by a clamping cylinder, and this embodiment does not limit this.

[0128] According to the above technical solution, the clamping cavity defined by the guiding part can accurately accommodate the positive current collecting disc so as to accurately align with the battery cell. Moreover, under the clamping action of multiple limiting clamping parts, the positive current collecting disc can be stably maintained in the clamping cavity to ensure stable pressing between the positive current collecting disc and the battery cell.

[0129] It is worth mentioning that after the limiting clamping part completes the clamping action of the positive collector disc, the positive collector disc still has the freedom to rotate along the axis in the second direction, and the welding of the positive collector disc and the battery cell also has circumferential position requirements to ensure that the positive collector disc welding structure 144 can weld the positive collector disc and the physical structure of the battery cell. Considering that the positive collector disc usually has some matching recesses such as holes and grooves, in order to prevent the positive collector disc from rotating and dislocating in the clamping cavity, in this embodiment, a stop-rotation protrusion is also formed on the holding seat, and the stop-rotation protrusion is arranged corresponding to the clamping cavity to cooperate with the matching recess on the positive collector disc to limit the rotation of the positive collector disc. After the positive collector disc is clamped by the holding seat, the stop-rotation protrusion on the holding seat can align and cooperate with the matching recess on the positive collector disc, thereby completely limiting the rotational freedom of the positive collector disc and ensuring a smooth welding process.

[0130] In order to guide the positive current collecting disc, a guiding slope is formed on the end face of the guiding portion facing the placement portion, and the guiding slope extends toward the clamping cavity. With such an arrangement, when the positive current collecting disc enters the clamping cavity, the guiding slope can guide it, allowing it to enter the clamping cavity smoothly, thereby improving the smoothness of the pressing seat to press the positive current collecting disc.

[0131] Furthermore, an extrusion slope is formed on the end of the position-limiting clamping portion extending into the clamping cavity. Under the compressive action of the positive current collecting disk on the extrusion slope, the multiple position-limiting clamping portions can move away from each other until they clamp to the periphery of the positive current collecting disk, thereby forming a stable clamping force on the positive current collecting disk. It is worth mentioning that in this embodiment, the multiple position-limiting clamping portions have a tendency to move toward each other, thereby applying a continuous clamping force to the positive current collecting disk. For example, the multiple position-limiting clamping portions can be connected to the pressure holding seat via an elastic structure, and under the action of the elastic structure, the multiple position-limiting clamping portions can maintain a tendency to move toward each other.

[0132] In other embodiments, the guiding portion includes a plurality of guiding sections arranged in segments, and a clearance gap is formed between two adjacent guiding sections. The clearance gap is used for the passage of the limiting clamping portion. The guiding portion is formed by a plurality of guiding sections together, and a clearance gap can be formed between two adjacent guiding sections. The clearance gap provides clearance for the movement of the limiting clamping portion, and the size of the positive collecting disk clamping mechanism in the second direction can be reduced as much as possible, thereby reducing the probability of interference between the positive collecting disk clamping mechanism and the positive collecting disk feeding tooling 143, and improving the operation smoothness of the positive collecting disk welding unit 14.

[0133] It should be noted that the above-mentioned four technical features in parallel are "a rotation-stopping protrusion is also formed on the holding seat, and the rotation-stopping protrusion is arranged corresponding to the clamping cavity, which is used to cooperate with the matching recess on the positive collecting disk to limit the rotation of the positive collecting disk", "an extrusion slope is formed on the end of the limit clamping portion extending into the clamping cavity, and under the extrusion action of the positive collecting disk on the extrusion slope, the multiple limit clamping portions can move away from each other until they are clamped to the periphery of the positive collecting disk", "a guide slope is formed on the end face of the guide portion facing the placement portion, and the guide slope extends toward the clamping cavity" and "the guide portion includes a plurality of guide sections arranged in segments, and a clearance gap is formed between two adjacent guide sections, and the clearance gap is used for the limit clamping portion to pass through" can be set one by one, two by two, three by three, or even set at the same time. Obviously, setting them at the same time will have more effects.

[0134] Furthermore, the second production device 2 is formed with a shell assembly station, a positive electrode penetration welding station, a current collecting plate side wall welding station and a negative current collecting plate welding station. The second production device 2 includes a shell conveyor line 21, a second battery cell conveyor line 22, a shell assembly unit 23, a positive electrode penetration welding unit 24, a current collecting plate side wall welding unit 25 and a negative current collecting plate welding unit 26. The shell conveyor line 21 is used to convey the shell of the battery cell to the shell assembly station. The second battery cell conveyor line 22 passes through the shell assembly station, the positive electrode penetration welding station, the current collecting plate side wall welding station and the negative current collecting plate welding station in sequence to convey the battery cell. The shell assembly unit 23 is arranged at the shell assembly station to push the battery cell that has completed flattening the battery cell and welding the positive current collecting plate into the shell until the bottom of the shell. The positive electrode penetration welding unit 24 is provided at the positive electrode penetration welding station to weld the positive current collecting plate and the bottom of the shell into one. The current collecting plate side wall welding unit 25 is provided at the current collecting plate side wall welding station, including a guide assembly 251, a battery cell feeding mechanism 252, a negative current collecting plate feeding mechanism 253, a driving mechanism 254 and a negative pole shell welding assembly 255. The guide assembly 251 includes two guide members 2511 arranged opposite to each other, and the opposite sides of the two guide members 2511 are respectively provided with notch grooves. The two guide members 2511 are relatively movable so that when they approach each other to a preset position, the corresponding two notch grooves define a stepped hole. The inner wall of the stepped hole is formed with a step surface. The stepped hole has a first hole section facing the step surface and a second hole section away from the step surface. The radial dimension of the first hole section is gradually reduced in the direction toward the second hole section, and the step surface is used to support the shell. end, the inner wall of the second hole segment is used to abut the outer wall of the shell, and the first hole segment is used to introduce the negative collecting disc into the shell so that the flange of the negative collecting disc abuts the inner wall of the shell, and the battery cell feeding mechanism 252 is movably arranged, including a bearing component and an end limit component, the bearing component is used to support the battery cell, and the end limit component is used to abut one end of the battery cell in the axial direction, the negative collecting disc feeding mechanism 253 is movably arranged, including a first negative collecting disc picking portion 441 for picking up the negative collecting disc and assembling the negative collecting disc to the shell, the driving mechanism 254 drives the battery cell feeding mechanism 252 and the negative collecting disc feeding mechanism 253 to move, the negative pole shell welding assembly 255 is used to weld the assembled negative collecting disc and the shell, and the negative collecting disc welding unit 26 is provided at the negative collecting disc welding station, for welding the negative collecting disc at the negative collecting disc welding station to the negative pole of the battery cell.

[0135] In this embodiment, the second cell conveyor line 22 conveys the cell to the shell assembly station, and the shell conveyor line 21 conveys the shell to the shell assembly station to install the cell and the shell together. Then, the second cell conveyor line 22 can convey the cell to the positive electrode penetration welding station, and the positive electrode penetration welding unit 24 can weld the shell, positive collector and cell winding core at the positive electrode of the cell into one. After that, the second cell conveyor line 22 conveys the cell to the collector side wall welding station. At this time, the drive mechanism 254 drives the The battery cell feeding mechanism 252 and the negative current collecting plate feeding mechanism 253 are movable to enable the negative current collecting plate to enter the shell and abut against the shell. In the process of the negative current collecting plate being installed into the shell, since the end limit assembly cooperates with the guide assembly 251, the shell can be well positioned, the position of the shell is stable, and the negative current collecting plate can be accurately and smoothly installed into the shell, which can improve the assembly efficiency, assembly accuracy and assembly success rate of the negative current collecting plate. In the assembly process, the negative current collecting plate and the shell mainly move relative to each other in the axial direction of the battery cell. With the support of the bearing assembly and the end limit assembly Under the condition of limitation, the guide assembly 251 mainly plays a guiding role in the axial direction of the shell. Due to the setting of the guide assembly 251, when the negative collecting disc is installed into the shell, the step surface abuts the end of the shell, and the inner wall of the second hole segment abuts the outer wall of the shell, avoiding radial and axial displacement of the shell, and the position of the shell is stable. Under the guiding action of the first hole segment, the negative collecting disc can be accurately and smoothly installed into the shell, which can improve the assembly efficiency, assembly accuracy and assembly success rate of the negative collecting disc, and after the negative collecting disc is installed into the shell, the two guide members 2511 can The guide assembly 251 does not need to provide a large clamping force on the shell in its radial direction, which can avoid deformation and damage of the battery cell, improve product quality, and further improve the welding efficiency and quality of the negative collector plate. Finally, the second shell conveyor line 21 transports the battery cell to the negative collector plate welding station, and the negative collector plate welding unit 26 is used to weld the negative collector plate at the negative collector plate welding station to the negative pole of the battery cell.

[0136] It should be noted that in the present application, when the negative current collecting disc is not introduced into the shell, the battery cell includes a shell and a winding core accommodated in the shell. After the negative current collecting disc is introduced into the shell, the battery cell includes a shell, a winding core and a negative current collecting disc, which will not be repeated below.

[0137] The present application does not make any specific limitation on the implementation method of the movable setting of the battery cell loading mechanism 252 and the negative current collecting plate loading mechanism 253. In this embodiment, the battery cell loading mechanism 252 includes a first slide, and the bearing assembly, the guide assembly 251, and the end limit assembly are arranged on the first slide; the negative current collecting plate loading mechanism 253 includes a second slide, and the first negative current collecting plate picking part 441 is arranged on the second slide; the driving mechanism 254 includes a second double-motor linear motor, and the second double-motor linear motor is used to drive the first slide and the second slide to move respectively. In this way, the first slide and the second slide can be driven to move by the second double-motor linear motor, thereby realizing the movement of the battery cell loading mechanism 252 and the negative current collecting plate loading mechanism 253, while ensuring the function of the equipment, the structure is more integrated.

[0138] It can be understood that welding the flange of the negative collecting plate to the inner wall of the shell requires welding at least at multiple positions around the negative collecting plate. In this embodiment, the end limit assembly includes a battery cell pressure head, which is rotatably set; the first negative collecting plate picking part 441 includes a welding pressure head, which is rotatably set, and the welding pressure head is provided with a first adsorption hole for picking up the negative collecting plate. In this way, when welding the flange of the negative collecting plate (generally a negative collecting plate has three sections of flange) to the inner wall of the shell, the welding gun head does not rotate, and the shell, the winding core and the negative collecting plate rotate together. The welding gun head intermittently emits light continuously for multiple times (for example, three times) to complete the welding of multiple (for example, three) flanges and the inner wall of the shell, so as to achieve welding (spot welding or continuous welding, preferably continuous welding) at multiple positions (for example, three sections of flange positions). The relative position of the welding gun head is easier to control, and the welding position accuracy is higher, which is conducive to improving welding efficiency and welding quality.

[0139] In this embodiment, the battery cell pressure head is used to abut one axial end of the battery cell, and the welding pressure head is used to abut the negative collector disk on the other end of the battery cell. The battery cell feeding mechanism 252 also includes a first rotary drive member, the driving end of which is connected to the battery cell pressure head. When the negative collector disk is in contact with the shell, the battery cell is driven to rotate by the first rotary drive member, driving the welding pressure head to rotate synchronously. In this way, the battery cell pressure head actively rotates, driving the welding pressure head to rotate passively, which can ensure the synchronous rotation of the shell, the winding core and the negative collector disk, thereby ensuring the stability of the relative position of the shell and the negative collector disk, which is conducive to the smooth progress of the welding operation, further improving the welding position accuracy, and improving the welding efficiency and welding quality. Specifically, the first rotary drive member includes a first servo motor to obtain higher positioning accuracy.

[0140] In one embodiment, the supporting assembly includes a roller assembly, and the roller assembly includes a first roller (for example, four are provided to achieve better support effects at both ends of the shell), and the first roller is set to rotate along an axis parallel to the axial direction of the battery cell. The rotation setting of the first roller can avoid hard friction with the shell, making the rotation of the battery cell smoother, reducing the friction of the shell, and helping to improve welding efficiency and welding quality.

[0141] In addition, in one embodiment of the present application, the negative electrode shell welding assembly 255 includes a pressure roller assembly and a gun head assembly. The pressure roller assembly includes a second roller, which is used to press the battery cell and rotates with the rotation of the battery cell. The gun head assembly includes a welding gun head for welding the negative current collector and the shell. The pressure roller assembly presses the battery cell downward to prevent the battery cell from jumping during welding, thereby ensuring that the battery cell does not shift during rotation and improving the welding position accuracy. The rotation setting of the second roller can avoid hard friction with the shell, making the battery cell rotate more smoothly, which is conducive to improving welding efficiency and welding quality. Specifically, the welding gun head is tilted to achieve welding of the negative current collector and the shell. More specifically, the welding gun head can rotate about at least two intersecting axes to conveniently adjust the angle of the welding gun head to achieve better welding results. The negative electrode shell welding assembly 255 also includes a dust cover corresponding to the welding gun head to remove dust and improve welding quality.

[0142] In this embodiment, the collecting plate side wall welding unit 25 also includes a negative collecting plate feeding mechanism, and the negative collecting plate feeding mechanism includes a second rotating driving member and a second negative collecting plate picking portion 441. The second negative collecting plate picking portion 441 is used to pick up the negative collecting plate in the horizontal direction. The second rotating driving member is used to drive the second negative collecting plate picking portion 441 to rotate from the horizontal direction to the vertical direction to achieve the docking of the second negative collecting plate picking portion 441 with the first negative collecting plate picking portion 441. Through the setting of the negative collecting plate feeding mechanism, the posture of the negative collecting plate fed in a horizontal posture can be adjusted It is adjusted to a vertical posture. After the second negative collecting tray picking part 441 transfers the vertical posture negative collecting tray to the first negative collecting tray picking part 441, the first negative collecting tray picking part 441 does not need to adjust the posture of the negative collecting tray and can directly assemble the negative collecting tray into the shell by horizontal movement. The flipping and loading assembly actions of the negative collecting tray are respectively completed by the negative collecting tray feeding mechanism and the negative collecting tray loading mechanism 253, which reduces the complexity and cost of a single mechanism, is more convenient to control, and the activity accuracy is easier to ensure, thereby improving the assembly accuracy of the negative collecting tray, and improving welding efficiency and welding quality.

[0143] In one embodiment, the negative collecting tray feeding mechanism also includes a rotating shaft and a slide cylinder, the driving end of the second rotating driving member is connected to the rotating shaft, the slide cylinder and the second negative collecting tray picking part 441 are installed on the rotating shaft, and the slide cylinder is driven and connected to the second negative collecting tray picking part 441. In this way, the second rotating driving member drives the rotating shaft to rotate, so that the second negative collecting tray picking part 441 and the slide cylinder can rotate along the axis extending in the first direction or the second direction; the slide cylinder drives the second negative collecting tray picking part 441 to move, thereby realizing the height adjustment of the negative collecting tray in a vertical posture, so as to realize the docking of the first negative collecting tray picking part 441 and the second negative collecting tray picking part 441. Specifically, in order to improve the accuracy of transfer positioning, an induction block that moves with the second negative current collecting tray picking part 441 is provided, and two photoelectric sensors are provided accordingly to ensure that the slide cylinder moves into place, and the second negative current collecting tray picking part 441 can accurately reach the preset position to accurately dock with the first negative current collecting tray picking part 441. After the docking is completed, the second negative current collecting tray picking part 441 can accurately return to its position to facilitate feeding. It should be noted here that in order to ensure accurate docking between the first negative current collecting tray picking part 441 and the second negative current collecting tray picking part 441, the battery cell feeding mechanism 252 includes an in-situ limit cylinder and an origin sensor, so that the first negative current collecting tray picking part 441 can accurately return to its position after the assembly of the negative current collecting tray is completed. Specifically, in order to achieve smooth transfer of the negative collecting disc between the first negative collecting disc picking-up portion 441 and the second negative collecting disc picking-up portion 441, the first negative collecting disc picking-up portion 441 is elastically installed to avoid hard collision when the first negative collecting disc picking-up portion 441 and the second negative collecting disc picking-up portion 441 are connected.

[0144] In one embodiment, the second negative current collecting tray pickup portion 441 has a pickup end, which is configured to have a retaining groove conforming to the negative current collecting tray. A second suction hole is provided at the bottom of the retaining groove, and the retaining groove is configured to receive the negative current collecting tray. Thus, when the negative current collecting tray is received in the retaining groove, the second suction hole allows for stable pickup of the negative current collecting tray. The above two embodiments may be present either or both.

[0145] In this embodiment, the current collecting plate side wall welding unit 25 also includes a cell transfer mechanism corresponding to the cell loading mechanism 252. The cell transfer mechanism includes a cell pickup portion 441. The cell pickup portion 441 is movably provided to enable the loading and unloading of cells. In this way, the cell transfer mechanism transfers the cell with the shell to the cell loading mechanism 252. After the negative current collecting plate is inserted into the shell and abuts against the shell, the negative shell welding assembly 255 welds the negative current collecting plate and the shell in the abutting state. After welding is completed, the cell transfer mechanism unloads the cells of the negative current collecting plate and the shell, which is conducive to the smooth loading and unloading of cells and improves welding efficiency and welding quality. Specifically, the cell pickup portion 441 includes a clamping claw assembly, and the cell transfer mechanism includes a first linear motor and a lifting slide to achieve the lifting and horizontal movement of the clamping claw assembly. Specifically, in order to enable the battery cells to be grasped by the gripper assembly and transported to the battery cell loading mechanism 252, the battery cell loading mechanism 252 includes an incoming material sensor arranged at the position of the supporting assembly. The incoming material sensor is used to determine whether there are battery cells on the supporting assembly and whether the battery cells are placed in place, so as to avoid missing or improper placement of battery cells.

[0146] It can be understood that in the present application, the collecting plate side wall welding unit 25 has multiple workstations, including (not shown in the figure, refer to the position of the negative collecting plate loading mechanism 253 in the figure for understanding), a battery cell loading station (not shown in the figure, refer to the position of the battery cell loading mechanism 252 in the figure for understanding), and a welding station (not shown in the figure, refer to the position of the negative pole shell welding assembly 255 in the figure for understanding), so as to respectively realize the loading of the negative collecting plate, the loading of the battery cell, and the welding of the negative collecting plate and the shell in the abutment state. In one embodiment, the negative collecting plate loading station, the battery cell loading station, and the welding station are distributed along the first direction, and the negative collecting plate loading station, the battery cell loading station, and the welding station are all provided in multiple numbers along the second direction, with a compact layout, which can realize the assembly and welding of negative collecting plates and battery cells (including shells) in batches, while improving the welding efficiency between the negative collecting plate and the inner wall of the shell, the structure is more compact, and the overall volume of the structure is reduced. Specifically, the battery cell loading mechanism 252 is provided with multiple sets (two sets as shown in the figure, and three sets or other quantities are also possible), each set of the battery cell loading mechanism 252 includes multiple bearing components (six as shown in the figure), guide components 251 (six as shown in the figure), and end limit components (six as shown in the figure), and the negative collecting plate loading mechanism 253 is provided with multiple sets (two sets as shown in the figure), each set of the negative collecting plate loading mechanism 253 includes multiple (six as shown in the figure) first negative collecting plate picking parts 441, so as to correspond to twelve negative collecting plates and twelve battery cells, increase the processing capacity of the equipment, speed up the operation rhythm, and improve welding efficiency.

[0147] Furthermore, the plurality of welding stations form at least two groups, each group including a plurality of welding stations; the negative electrode shell welding assembly 255 includes a gun head assembly movably arranged along the second direction (specifically, driven by a second linear motor), the gun head assembly includes a plurality of welding gun heads distributed along the second direction, and when the gun head assembly moves to each corresponding position, the plurality of welding gun heads correspond to the plurality of welding stations in the same group. In this way, when the gun head assembly moves as a whole once to switch to a corresponding position, the plurality of welding gun heads correspond to the plurality of welding stations in the group to realize the welding of the plurality of negative collecting plates and shells of the plurality of welding stations in the group, and then the gun head assembly moves as a whole once to switch to another corresponding position, and the plurality of welding gun heads correspond to the plurality of welding tasks of another group to complete the welding of the plurality of negative collecting plates and shells of the plurality of welding stations in another group. Compared with the single gun head welding, which moves one position at a time, the number of overall movements is reduced, the number of overall movements of the welding assembly is reduced, and production efficiency is improved. Specifically, since the size of the welding gun head is larger than the size of the first negative collecting plate picking-up portion 441, etc., if the distance between the welding gun heads is too close, they will interfere with each other and affect the welding effect. Relatively speaking, the arrangement space of multiple welding gun heads can correspond to the arrangement space of a larger number of first negative collecting plate picking-up portions 441, etc. For example, three welding gun heads correspond to six first negative collecting plate picking-up portions 441 (that is, corresponding to six welding stations), and the six first negative collecting plate picking-up portions 441 are arranged in sequence. When the welding assembly is switched to a corresponding position, the three welding gun heads correspond to the three first negative collecting plate picking-up portions 441 ranked first, third and fifth, respectively (that is, the group of welding stations includes the three welding stations ranked first, third and fifth). ), when the welding assembly moves as a whole once to switch to another corresponding position, the three welding gun heads correspond to the three first negative collecting plate picking parts 441 ranked second, fourth and sixth respectively (that is, this group of welding stations includes three welding stations ranked second, fourth and sixth), that is, the two groups of welding stations are staggered, which can avoid mutual interference between the welding gun heads and make the multiple first negative collecting plate picking parts 441 more compact, while improving the processing capacity of the equipment, making the structure more compact and reducing the overall volume of the structure, that is, the two groups of welding stations are staggered, which can obtain a faster production rhythm based on the minimum spacing requirements of the welding gun heads and the position spacing between each battery cell, improve welding efficiency and save space.Of course, since the battery cell loading mechanism 252 is provided with two sets and the negative collecting plate loading mechanism 253 is also provided with two sets, it can correspond to four groups of the welding stations, each group includes six welding stations, and each set corresponds to the above-mentioned two groups of welding stations, which increases the processing capacity of the equipment, has a compact structure, and saves space. The above-mentioned number of sets, number of groups, and number are all exemplary expressions, and this application does not limit them. The number of sets, number of groups, and number can also be other quantities.

[0148] Furthermore, the third production device 3 is formed with a cover plate loading station, a pre-spot welding station, a cover plate welding station, a post-weld cleaning station and a post-weld inspection station. The third production device 3 includes an AGV automatic docking cache conveyor line, a third battery cell conveyor line 32, a pre-spot welding mechanism 33, a cover plate welding mechanism 34, a cleaning mechanism 35 and an inspection mechanism 36. The AGV automatic docking cache conveyor line is used to convey the cover plate of the battery cell to the pre-spot welding station. The third battery cell conveyor line 32 passes through the cover plate loading station, the pre-spot welding station, the cover plate welding station, the post-weld cleaning station and the post-weld inspection station in sequence to convey the battery cell with the negative collector plate welded. The pre-spot welding mechanism 33 is provided at the pre-spot welding station to pre-weld the negative electrode cover plate and the shell of the battery cell at the pre-spot welding station. Spot welding, the cover plate welding mechanism 34 includes a transfer structure 341, a cover plate positioning structure 342 and a cover plate welding structure 343 welding structure, the transfer structure 341 has a movable stroke between the cover plate loading station and the cover plate welding station, for transferring the battery cell to the cover plate welding station, the cover plate positioning structure 342 is used to rotate and position the battery cell at the cover plate welding station, the cover plate welding structure 343 welding structure is used to weld the shell and the negative electrode cover of the battery cell that has completed the cover plate pre-spot welding at the cover plate welding station into one, the cleaning mechanism 35 is provided at the post-weld cleaning station, for cleaning the battery cell at the post-weld cleaning station, the detection mechanism 36 is provided at the post-weld detection station, for detecting the weld of the battery cell at the post-weld detection station.

[0149] In this embodiment, the AGV automatic docking cache conveyor line is set up corresponding to the cover plate loading station so as to convey the cover body to the cover plate loading station, and the third battery cell conveyor line 32 is set up so as to accurately and stably convey the shell to the cover plate loading station, and convey the welded battery cell to the post-weld cleaning station and the sealing station, and the transfer structure 341 is set up to transfer the shell and the cover body to the cover plate welding station, and the cover plate positioning structure is set up to rotate and clamp the shell and the cover body to the cover plate welding station, and the cover plate welding structure 343 is set up to weld the battery cell cover plate at the cover plate welding station, and the cleaning mechanism 35 is set up to clean the weld of the battery cell after welding, and the detection mechanism 36 is set up to After cleaning, the welds of the battery cells are inspected to determine whether the sealing quality of the battery cells meets the requirements. In this way, the AGV is set to automatically dock the cache conveyor line and the third battery cell conveyor line 32 so as to convey the cover body and the shell respectively. A cover welding mechanism 34 is set to seal the shell and the cover body at the cover welding station, and the cleaning mechanism 35 is set to clean the welds of the battery cells so as not to affect the detection of the detection mechanism 36. At the same time, the detection mechanism 36 is set to monitor the sealing quality of the battery cells so as to eliminate unqualified products, which is beneficial to improving the yield rate of the cylindrical electrode cover welding device. The entire process does not require manual participation, which can not only reduce the intensity of manual labor, but also improve welding efficiency, thereby solving the problem of difficulty and low efficiency of existing cover welding.

[0150] The third production device 3 is formed with a cover loading station, a cover welding station, a post-weld cleaning station and a sealing station. The AGV automatic docking and cache conveyor line includes an AGV cart, a material receiving mechanism, a cache mechanism and a transfer mechanism. The AGV cart is used to transfer pallets carrying materials. The third production device 3 is formed with a material receiving station, a cache station and a feeding station arranged in sequence along the left and right directions. The material receiving mechanism includes a material receiving seat movably installed on the third production device 3 along the third direction, which is used to receive the pallet transferred from the AGV cart. The cache mechanism is provided at the cache station, which is used to position the pallet transferred from the material receiving station at the cache station, and the transfer mechanism is used to transfer the pallet transferred from the cache station to the feeding station.

[0151] In this embodiment, the AGV trolley is provided so that the pallet carrying the materials can be transferred to the material receiving station. The material receiving seat movable along the third direction is provided. On the one hand, the height of the material receiving seat can be flush with the AGV trolley so that the pallet on the trolley can be transferred to the material receiving seat. On the other hand, the height of the buffer station can be lowered to increase the stacking height of the pallets, which is conducive to increasing the number of buffered pallets. The buffer mechanism is provided to increase the storage space of the pallets, so that the AGV can automatically dock with the buffer conveyor line to buffer more pallets. At the same time, by providing The transfer mechanism is arranged to transfer the pallet transferred from the cache mechanism to the feeding station so that the subsequent pick-up and placement equipment can grab the material on the pallet. In this way, by setting the AGV trolley, the material receiving mechanism, the cache mechanism and the transfer mechanism, the pallet transferred by the AGV trolley can be automatically transported to the feeding station, thereby improving the feeding efficiency of the AGV automatic docking cache conveyor line, and more pallets can be cached, reducing waiting time and meeting the rhythm requirements of battery production, thereby solving the problem that the rhythm of the existing feeding device is slow, which affects battery production.

[0152] It should be noted that the number of pallets transferred by the AGV can vary, including a single pallet or multiple pallets stacked together, and this application does not limit this. In particular, the third production device 3 also includes a material transfer structure for transferring the cover body at the feeding station to the cover plate loading station. Specifically, the material transfer structure can be a material transfer robot or a clamping claw that moves along the first direction, the second direction, and the third direction, and this application does not limit this.

[0153] In order to enable the pallet on the AGV trolley to move to the material transfer structure, in this embodiment, the AGV trolley includes a vehicle body and a pallet drive structure, and the pallet drive structure includes a plurality of rollers arranged on the vehicle body at intervals along the first direction or the second direction, wherein the pallet is placed on the material transfer structure to transfer the pallet to the material receiving seat when the AGV trolley is docked with the material receiving seat. It can be understood that the plurality of material receiving mechanisms and the cache mechanisms are provided with a pallet drive structure for driving the pallet to move along the first direction or the second direction so that the pallet can move to the cache mechanism and the transfer mechanism. Furthermore, in the pallet drive structure, at least the two drive rollers at both ends are active rollers, so that it is convenient to drive the pallet into the material receiving mechanism or the cache mechanism, and it is also convenient to drive the pallet out of the material receiving mechanism and the cache mechanism.

[0154] In some embodiments, the material receiving mechanism also includes a material receiving drive structure and a material receiving positioning structure. The material receiving drive structure drives and connects the material receiving seat to drive the material receiving seat to move along a third direction. The material receiving positioning structure is provided on the material receiving seat to position the pallet on the material receiving seat. In this way, by setting the material receiving drive structure to drive the material receiving seat to move along the third direction, it can not only dock with the AGV cart, but also lower the height of the cache station. At the same time, by setting the material receiving positioning structure, the pallet can be positioned on the material receiving seat to prevent the pallet from moving beyond the material receiving seat.

[0155] Furthermore, the material receiving positioning structure includes a material receiving limiting portion and a material receiving positioning drive structure, wherein the material receiving limiting portion is movably mounted on the material receiving seat along a third direction, and the material receiving positioning drive structure is provided on the material receiving seat and is driven to connect with the material receiving limiting portion, so as to drive the material receiving limiting portion to move along the third direction. When positioning is required, the material receiving positioning drive structure drives the material receiving limiting portion to move upward so that the tray can abut against the material receiving limiting portion to position the tray on the material receiving seat. When positioning is not required, the material receiving positioning drive structure moves downward so that the tray can move to the cache station through the material receiving limiting portion. In this way, by providing the material receiving limiting portion and the material receiving positioning drive structure, the tray can be positioned on the material receiving seat without affecting the movement of the tray, so that the material receiving mechanism can transfer the tray to the cache mechanism. It is understandable that the material receiving positioning drive structure can be a driving cylinder or a driving oil cylinder, etc., which is not limited in this application.

[0156] In some embodiments, the material receiving mechanism also includes a material receiving sensor provided on the material receiving seat. The material receiving sensor is provided at the end of the material receiving seat away from the buffer station so as to detect the position of the tray and determine whether the tray enters the material receiving seat, thereby facilitating the tray driving structure to control the movement of the tray.

[0157] In some embodiments, the material receiving mechanism also includes a material receiving sensor provided on the material receiving seat. The material receiving sensor is provided at one end of the material receiving seat close to the buffer station to detect the position of the tray. It can be used to determine whether the tray has moved into place so as to control the movement of the material receiving positioning structure, and can also be used to determine whether the tray has moved out of the material receiving seat, thereby facilitating the tray driving structure to control the movement of the tray.

[0158] It should be noted that the above two related technical features: "the material receiving sensor is arranged at the end of the material receiving seat away from the cache station" and "the material receiving sensor is arranged at the end of the material receiving seat close to the cache station" can be set one by one or at the same time. Obviously, setting them at the same time will have a better effect.

[0159] In some embodiments, the cache mechanism includes a cache limiting portion and a cache driving structure. The cache limiting portion is movably arranged along a third direction. The cache driving structure drives and connects the cache limiting portion to drive the cache limiting portion to move along the third direction. When limiting is required, the cache driving structure drives the cache limiting portion to move upward so that the tray can abut against the cache limiting portion to position the tray at the cache station. When caching is not required, the cache driving structure moves downward so that the tray can move through the cache limiting portion to the transfer mechanism. In this way, by providing the cache limiting portion and the cache driving structure, the tray can be positioned at the cache station without affecting the movement of the tray, so that the cache mechanism can transfer the tray to the transfer mechanism. It can be understood that the cache driving structure can be a driving cylinder or a driving oil cylinder, etc., and this application does not limit this.

[0160] In some embodiments, the cache mechanism also includes two cache limit plates, which are spaced apart on both sides of the tray. In this way, by setting the two cache limit plates, the tray can move in a straight line to prevent the tray from shifting in direction during transportation.

[0161] In order to transfer the pallet to the feeding station, in this embodiment, the transfer mechanism includes a transfer lifting structure and a transfer positioning assembly. The transfer lifting structure is used to move the pallet transferred from the cache station upward to the feeding station, and the transfer positioning assembly includes two transfer clamping structures. Among the two transfer clamping structures, one of the transfer clamping structures is arranged in the left and right direction, and the other transfer clamping structure is arranged in the front and back direction, so as to position the pallet at the feeding station. In this way, the transfer lifting structure is set to transfer the pallet transferred from the cache mechanism upward to the feeding station, and at the same time, the two transfer clamping structures are set to clamp and position the pallet at the feeding station, so as to prevent the pallet from moving when the pick-up and placement device grabs the material on the pallet, thereby facilitating the pick-up and placement device to grab the material.

[0162] Furthermore, the transfer lifting structure includes a transfer frame and a transfer drive structure. The transfer frame is movably arranged along a third direction, and the transfer drive structure drives and connects the transfer frame to drive the transfer frame to move along the third direction. In this way, the transfer frame is arranged to carry the pallet, and the transfer drive structure is arranged to drive the transfer frame to move downward to receive the pallet transferred from the buffer station, and can also drive the transfer frame to move upward to move the pallet to the feeding station.

[0163] Furthermore, the transfer drive structure includes a transfer drive motor and a transfer transmission structure, the transfer transmission structure includes a first ball screw structure, the first ball screw structure includes a first screw and a first ball sleeved on the first screw, the first ball is provided on the transfer frame, and the first screw is driven to connect to the transfer drive motor. Thus, by providing the transfer drive motor, the first screw is driven to rotate, and by providing the first ball screw structure, the rotation of the transfer drive motor is converted into a third-direction movement, so that the transfer drive motor can drive the transfer frame to move along the third direction. Further, the transfer transmission structure also includes a first belt transmission structure, the first belt transmission structure includes a first driving wheel, a first driven wheel and a first synchronous belt provided between the driving wheel and the driven wheel, the first driving wheel is driven to connect to the output shaft of the transfer drive motor, and the first driven wheel is provided on the first screw. Thus, by providing the first synchronous belt structure, the layout direction of the transfer drive motor can be adjusted, thereby helping to improve the space utilization of the transfer drive structure.

[0164] In some embodiments, the transfer lifting structure also includes a transfer sensor, which is provided on the transfer rack to sense whether there is a pallet on the transfer rack. In this way, the transfer sensor is provided to determine the status of the pallet on the transfer rack, so that when there is no pallet on the transfer rack, the transfer rack is controlled to move downward to receive the pallet transferred from the buffer workstation.

[0165] In some embodiments, the transfer lifting structure also includes a transfer sensor, which is used to sense whether the pallet on the transfer rack is moved to the feeding station. In this way, by setting the transfer sensor, after the pallet is moved to the feeding station, the transfer rack stops moving, and the transfer positioning component works at the same time to clamp and position the pallet at the feeding station.

[0166] It should be noted that the above two related technical features: "the transfer sensor is provided on the transfer rack" and "the transfer sensor is provided on the transfer rack" can be set either one or at the same time. Obviously, setting them at the same time will have a better effect.

[0167] In some embodiments, the transfer clamping structure includes two clamping parts spaced apart along the first direction or the second direction, at least one of the clamping parts is a movable clamping part, and the movable clamping part is movably arranged along the first direction or the second direction to clamp the pallet. In this way, by setting the movable clamping part, the spacing between the two clamping parts can be adjusted so that the two transfer clamping structures can clamp the pallet in the front-to-back direction and the left-to-right direction at the same time. It is understandable that there are many ways to set the two clamping parts, both of which can be movable clamping parts, or there can be only one movable clamping part, and this application does not limit this. Furthermore, there are many driving structures for the movable clamping part, for example, it can be a pneumatic cylinder, an oil cylinder, an electric push rod, etc., and this application does not limit this.

[0168] In some embodiments, the third production device 3 is also formed with a first pallet transfer station and a second pallet transfer station arranged along a third direction, and the AGV automatic docking cache conveyor line also includes a transfer mechanism, and the transfer mechanism includes a pallet transfer structure and a transfer lifting structure. The pallet transfer structure is used to transfer the pallet of the feeding station to the first pallet transfer station, and the transfer lifting structure is used to transfer the pallet at the first pallet transfer station to the second pallet transfer station. In this way, by setting the pallet transfer structure, the empty pallet after taking the material can be transferred to the first pallet transfer station, so that the transfer rack can move downward to receive the pallet transferred by the cache mechanism, and by setting the transfer lifting structure, the empty pallet can be transferred from the first pallet transfer station to the second pallet transfer station, so that other transfer structures can transfer the empty pallet out.

[0169] It should be noted that the transfer lifting structure has the same structure as the transport lifting structure, but the transport lifting structure is used to receive the pallet transferred by the cache mechanism and transfer the pallet upward to the feeding station, while the transfer lifting structure receives the empty pallet transferred from the feeding station and transfers the empty pallet to the second pallet transfer station so that the empty pallet can be transferred out later.

[0170] Furthermore, the pallet transfer structure includes a transfer seat, a transfer clamp and a transfer drive assembly, the transfer seat is movably arranged in the front-to-back direction, the transfer clamp is movably installed on the transfer seat along a third direction to clamp the pallet, and the transfer drive assembly includes a first transfer drive structure and a second transfer drive structure, the first transfer drive structure drives and connects the transfer seat to drive the transfer seat to move in the front-to-back direction, the second transfer drive structure drives and connects the transfer clamp to drive the transfer clamp to move in the third direction, thus, by setting the first transfer drive structure, the transfer seat is driven to switch between the feeding station and the first transfer station, and by setting the second transfer drive structure, when the transfer seat is in the feeding station, the transfer clamp is driven to move in the third direction to grab the empty pallet, and when the transfer seat is in the first transfer station, the transfer clamp is driven to move in the third direction to place the empty pallet on the transfer lifting structure, so that the transfer lifting structure can transfer the empty pallet to the second transfer station. It is understandable that the second transfer drive structure can be a pneumatic cylinder, an oil cylinder, or an oil cylinder, etc., and this application does not limit this.

[0171] It should be noted that when the transfer lifting structure transfers the pallet to the feeding station, one of the transfer clamping structures first pre-clamps the pallet in the front-to-back direction. At this time, the transfer clamping claw moves to the feeding station and clamps the pallet to pre-position the pallet. Then, the other transfer clamping structure clamps the pallet in the left-right direction, thereby clamping and fixing the pallet to the feeding station. In this way, by providing the transfer clamping claw to assist the transfer positioning assembly in positioning the pallet, it helps to improve the positioning accuracy of the pallet. Furthermore, clamping grooves extending in the left-right direction are provided on both sides of the pallet, and the two clamping grooves are respectively provided corresponding to the two transfer clamping claws, so that the pallet can still move in the left-right direction after being limited in the front-to-back direction.

[0172] Furthermore, the first transfer drive structure includes a transfer drive motor and a second ball screw structure, the second ball screw structure includes a second screw and a second ball sleeved on the second screw, the second ball is arranged on the transfer seat, and the second screw drive is connected to the transfer drive motor. In this way, the transfer drive motor is set to drive the second screw to rotate, and the second ball screw structure is set to convert the rotation of the transfer drive motor into linear movement, so that the transfer drive motor can drive the transfer seat to move in the forward and backward directions.

[0173] In some embodiments, the cache mechanism and the structure are provided with a feeding group corresponding one to one, and two feeding groups are provided, and the two feeding groups are provided corresponding to the transfer mechanism and the transfer mechanism respectively. In this way, by providing two feeding groups, one of the feeding groups can feed the transfer mechanism, and the other feeding group can transfer the empty pallet transferred by the transfer mechanism back to the AGV trolley, so as to form a cycle, so as to complete the recovery of the empty pallet while completing the feeding, thereby helping to improve the feeding efficiency of the AGV automatic docking cache conveyor line.

[0174] In some embodiments, the transplanting structure 341 includes a transplanting sliding seat, a transplanting mounting seat and a plurality of transplanting clamps. The transplanting sliding seat is movably arranged in the left and right directions. The movable stroke of the transplanting sliding seat passes through the cover plate loading station and the cover plate welding station. The transplanting mounting seat is movably installed on the transplanting sliding seat along a third direction. A plurality of transplanting clamps are provided on the transplanting mounting seat to take out the discharge core. When the transplanting sliding seat moves to the cover plate loading station, the transplanting mounting seat moves along the third direction so that the plurality of transplanting clamps can clamp the shell or the cover body. When the transplanting sliding seat moves to the cover plate welding station, the mounting seat moves along the third direction so that the transplanting clamps place the shell or the cover body on the cover plate welding station for subsequent welding of the shell and the cover body. In this way, by setting the transplanting sliding seat and the transplanting mounting seat, the shell and the cover body can be transferred to the cover plate welding station for subsequent welding.

[0175] In some embodiments, the cover plate positioning structure includes two first positioning clamping parts that are rotatably arranged along an axis extending in the front-to-back direction, and each of the first positioning clamping parts is movably arranged in the front-to-back direction to clamp and position the battery cell in the cover plate welding station. In this way, by providing two first positioning clamping parts, the shell and the cover body can be clamped and positioned in the cover plate welding station, and the shell and the cover body can be driven to rotate synchronously so that the cover plate welding structure 343 can perform cover plate welding on the shell and the cover body. Furthermore, the cover plate positioning structure also includes two first positioning clamping seats that are movably arranged in the front-to-back direction, wherein the two first positioning clamping parts are rotatably installed on the two first positioning clamping seats respectively. In this way, through the movement of the two positioning clamping seats, the shell and the cover body can be clamped in the cover plate welding station, and the cover plate positioning structure can be withdrawn from the cover plate welding station so that the transfer structure 341 can transfer the welded battery cell out. Furthermore, at least one of the two first positioning clamping parts is a movable positioning clamping part, and the cover plate positioning structure further includes a first positioning drive structure and a second positioning drive structure, wherein the first positioning drive structure is driven and connected to the positioning clamping seat to drive the positioning clamping seat to move along the first direction or the second direction, and the second positioning drive structure is driven and connected to the movable positioning clamping part to drive the movable positioning clamping part to rotate, so that the cover plate positioning structure can drive the shell and the cover body to rotate synchronously. It is understandable that the first positioning drive structure can be a cylinder, an oil cylinder, etc., which is not limited in this application, and the second positioning drive structure can be a drive motor, a rotary cylinder, etc., which is not limited in this application.

[0176] In some embodiments, the cover plate welding mechanism 34 further includes a first pressing structure, which includes a first pressing head and a first pressing drive structure. The first pressing head is movably arranged along a third direction, and the first pressing drive structure is driven and connected to the first pressing head to drive the first pressing head to move along the third direction. In this way, by providing the first pressing head, the shell and the cover body are pressed against the cover plate welding station along the third direction to prevent the shell and the cover body from moving during welding, thereby facilitating the welding of the cover plate welding structure 343. It is understandable that the first pressing drive structure can be a pneumatic cylinder, an oil cylinder, etc., and this application does not limit this.

[0177] Furthermore, the first pressure head includes a pressure head body, a pressure wheel and a pressure spring, the pressure head body is movably arranged along a third direction, the pressure wheel is rotatably installed on the first pressure head body along an axis extending in the front-rear direction, and the pressure spring is arranged between the first pressure head body and the pressure wheel to drive the pressure wheel to elastically press the battery cell. In this way, the pressure head body is arranged so that the pressure spring and the pressure wheel can be installed, so that the pressure wheel can move along the third direction under the drive of the pressure head body, and the pressure spring is arranged so that the pressure wheel can elastically press the battery cell to prevent the pressure wheel from damaging the battery cell. At the same time, the pressure wheel adopts a rotation setting so that it rotates synchronously with the battery cell, which can effectively reduce the friction between the pressure wheel and the battery cell and prevent the pressure wheel from damaging the battery cell.

[0178] In some embodiments, the cover plate welding structure 343 includes a welding mount, multiple lasers and a dust removal structure. The welding mount is movably arranged along the third direction and the first direction or the second direction. The multiple lasers are arranged on the welding mount to emit lasers to weld the battery cells to the cover plate. The dust removal structure includes an adsorption portion arranged on the welding laser seat to absorb welding spatter. In this way, the welding mount is set to move the laser, and the laser is set to weld the shell and the cover to the cover plate. At the same time, the adsorption portion is set to timely absorb the spatter during welding, which can avoid polluting the environment and improve the welding quality.

[0179] Generally speaking, to improve welding efficiency, the number of lasers should be consistent with the number of transplanting jaws, so that the cover plate welding structure 343 can weld all the multiple battery cells transferred by the multiple transplanting jaws. However, because the spacing between two adjacent battery cells is smaller than the spacing between two adjacent lasers, the lasers cannot correspond one-to-one with multiple battery cells. Therefore, in this embodiment, the transplanting structure 341 includes multiple transplanting jaws, and the number of lasers is half the number of transplanting jaws, so that the cover plate welding structure 343 can weld all the battery cells transferred by the transplanting structure 341 in two batches. This can not only meet the spacing requirements of the lasers, but also improve the welding efficiency of the cover plate welding structure 343. Furthermore, the number of transplanting jaws and lasers can vary. For example, there can be four transplanting jaws and two lasers, or there can be six transplanting jaws and three lasers, etc., which are not limited in this application. Specifically, taking the case where there are four transplanting clamps and two lasers as an example, after the transplanting clamps transplant the four battery cells numbered 1, 2, 3, and 4 to the cover welding station, the two lasers first weld the two battery cells numbered 1 and 3. After the two battery cells numbered 1 and 3 are welded, the two battery cells numbered 2 and 4 are welded. Such staggered welding can not only meet the spacing requirements of the lasers, but also improve the welding efficiency of the cover welding structure 343.

[0180] In some embodiments, the cover plate welding station, the transfer structure 341, the cover plate positioning structure, and the cover plate welding structure 343 are correspondingly set as welding groups, and two welding groups are set. In this way, by setting up two welding groups, when one of the welding groups is welding, the other welding group can load materials, which is beneficial to reduce waiting time, thereby helping to improve the welding efficiency of the cover plate welding mechanism 34.

[0181] In some embodiments, the cleaning mechanism 35 includes a second clamping structure and a cleaning structure, the second clamping structure includes a second pressure head movably arranged along a third direction, for pressing the battery cell to the post-weld cleaning station, the cleaning structure includes a cleaning mounting seat movably arranged along a first direction or a second direction, and a plurality of cleaning brushes rotatably mounted on the cleaning mounting seat along the axis of the first direction or the second direction, for cleaning a plurality of battery cells at the same time, when the welded battery cells are transferred to the post-weld cleaning station, the second pressure head moves downward to press the plurality of battery cells to the post-weld cleaning station, and then the cleaning mounting seat moves along the first direction or the second direction so that the plurality of cleaning brushes clean the plurality of battery cells at the same time, in this way, by setting the second clamping structure, the plurality of battery cells are fixed to prevent the cleaning structure from moving during cleaning, and by setting the cleaning structure, the plurality of battery cells are cleaned at the same time to remove the welding slag of the battery cells to avoid affecting subsequent welding detection. It is understood that there are various driving devices for driving the movement of the cleaning mount, such as a pneumatic cylinder or an oil cylinder, etc., which is not limited in this application. Similarly, there are various driving devices for driving the rotation of the brush, such as a motor or a rotary cylinder, etc., as long as they can drive the rotation of the cleaning brush, which is not limited in this application. Furthermore, the multiple cleaning brushes can be driven by multiple motors respectively, or by a single motor and a gear set synchronously, etc., which is not limited in this application.

[0182] Furthermore, the second pressure head includes a pressure head body and a plurality of elastic members, the pressure head body is movably arranged along a third direction, and the plurality of elastic members are fixedly arranged on the pressure head body and respectively arranged corresponding to a plurality of battery cells. In this way, by setting the pressure head body, the elastic member can be driven to move along the third direction, and at the same time, by setting a plurality of elastic members, the plurality of battery cells can be elastically pressed. It is understandable that the elastic member can be rubber or elastic plastic, etc., and this application does not limit this. Furthermore, the elastic member can be detachably mounted on the pressure head body. In this way, a detachable connection structure is adopted so that the corresponding elastic member can be replaced as needed, thereby helping to reduce the maintenance cost of the cleaning mechanism 35.

[0183] In some embodiments, the detection mechanism 36 includes a positioning and clamping structure, a third pressing structure and a detection structure. The positioning and clamping structure includes two second positioning and clamping parts rotatably arranged along an axis extending in the first direction or the second direction, and each second positioning and clamping part is movably arranged along the first direction or the second direction to clamp the battery cell and position it at the cover plate welding station. The third pressing structure includes a third pressure head movably arranged along the third direction to press the battery cell downward at the sealing station. The detection structure includes multiple D vision cameras, and the multiple D vision cameras are respectively arranged corresponding to multiple battery cells to simultaneously detect the welds of multiple battery cells. In this way, by setting the positioning and clamping structure to clamp the battery cell along the first direction or the second direction, by setting the third pressing structure to clamp the battery cell along the third direction, and at the same time by setting the D vision camera to detect the welds of the battery cell, so as to eliminate unqualified products, which is beneficial to improving the pass rate of the cylindrical electrode cover plate welding device.

[0184] It should be noted that compared to a 3D vision camera, the 3D vision camera can identify weld height, making it more precise and accurate in detecting weld quality. Furthermore, the positioning and clamping structure is identical to the cover plate positioning structure, and the third clamping structure is identical to the first clamping structure. Using the same structure improves component versatility and reduces procurement costs.

[0185] In some embodiments, the third production device 3 is further formed with a blanking position, and the third production device 3 also includes a blanking mechanism provided at the blanking station, the blanking mechanism including a flipping and pitching structure, a pushing structure and a blanking structure, the flipping and pitching structure including a flipping structure and a variable pitch structure, the flipping structure is used to flip the battery cell, the variable pitch structure is used to adjust the distance between two adjacent positioning parts, the pushing structure includes a pushing part movably arranged along the first direction or the second direction to push the battery cell into the flipping structure, the blanking structure includes a pushing part movably arranged along the first direction or the second direction to push the battery cell into the flipping structure, and the blanking structure includes a pushing part movably arranged along the first direction or the second direction The unloading robot is arranged in the movable and third directions to move out multiple battery cells. In this way, by setting the flip structure, the direction of the multiple battery cells is changed so that the multiple battery cells can be arranged vertically. By setting the variable distance structure, the distance between two adjacent battery cells is reduced to reduce the overall length of the multiple battery cells, thereby facilitating the unloading structure to grab the multiple battery cells. By setting the pushing structure, the multiple battery cells at the unloading position are pushed into the flipping distance structure. At the same time, by setting the unloading structure, the multiple battery cells are moved out of the flipping distance structure for subsequent processing.

[0186] Furthermore, the flip structure includes a flip frame rotatably arranged along an axis extending in the first direction or the second direction, a plurality of flip positioning parts movably mounted on the flip frame, and a flip drive structure drivingly connected to the flip frame, each of the flip positioning parts is provided with a positioning groove for installing a battery cell. Thus, by providing the flip frame, a plurality of the flip positioning parts can be installed, and by providing the flip positioning parts, a battery cell can be installed. At the same time, by providing the flip drive structure, the flip frame can be driven to rotate to adjust the direction of the flip positioning parts so that the battery cell on the flip positioning parts can be in a vertical state. Furthermore, the flip drive structure includes two flip drive motors, and the two flip drive motors are respectively provided at both ends of the flip frame. Thus, by providing the two flip drive motors, the flip frame is driven to flip so as to share the torque of the flip frame rotation, thereby reducing the load of each flip drive motor, thereby helping to improve the service life of the flip drive motor.

[0187] In some embodiments, the plurality of flip positioning parts include a movable flip positioning part at one end, the variable pitch structure includes a variable pitch drive motor and a third ball screw structure, the third ball screw structure includes a third screw and a third ball sleeved on the third screw, the third ball is provided on the movable flip positioning part, and the third screw drive is connected to the variable pitch drive motor. In this way, by providing the variable pitch drive motor to drive the third screw to rotate, and at the same time, by providing the third ball screw structure to convert the rotation of the variable pitch drive motor into linear movement, the variable pitch can drive the movable flip positioning part to move, so that the plurality of flip positioning parts can be retracted or extended, so as to adjust the total length of the plurality of flip positioning parts. Furthermore, a variable pitch guide structure is provided between two adjacent flip positioning parts, and the two adjacent variable pitch guide structures are respectively provided at both ends of the flip positioning part, so that the flip positioning part can move in a straight line and the two adjacent flip guide structures can be prevented from interfering. Furthermore, the flip guide structure includes a guide rod and a guide hole that cooperate with each other to guide each other, and the guide rod and the guide hole are respectively provided at two adjacent flip positioning parts.

[0188] In some embodiments, the blanking structure also includes a blanking mounting seat movably arranged along the first direction or the second direction and a blanking sliding seat movably mounted on the blanking mounting seat along a third direction, wherein the blanking robot is installed on the blanking sliding seat. In this way, by setting the blanking mounting seat, the blanking robot can be driven to move in the horizontal direction, and at the same time, by setting the blanking sliding seat, the blanking robot can be driven to move along the third direction to drive the battery cell.

[0189] Furthermore, the unloading robot is rotatably mounted on the unloading sliding seat along an axis extending in a third direction, and the unloading structure also includes a unloading rotating motor provided on the unloading sliding seat, and the unloading rotating motor drives the unloading robot. In this way, by setting the unloading rotating motor, the unloading robot is driven to rotate along the third direction to adjust the arrangement direction of multiple battery cells, thereby facilitating the transfer of multiple battery cells to subsequent conveying lines for subsequent processing.

[0190] Furthermore, the fourth production device 4 is formed with a cleaning station, a nail supply station, a sealing nail waiting for welding station and a sealing nail welding station. The fourth production device 4 includes a fourth battery cell conveying line 41, a cleaning component 42, a battery cell carrier 43, a nailing mechanism 44, a first visual positioning mechanism 45, a second visual positioning mechanism 46 and a sealing nail welding mechanism 47. The fourth battery cell conveying line 41 passes through the cleaning station, the sealing nail waiting for welding station and the sealing nail welding station in sequence to convey the battery cells that have completed cover plate welding. The cleaning component 42 includes a laser cleaning device, which is arranged corresponding to the cleaning station to clean the liquid injection hole of the battery cell that has completed cover plate welding in the cleaning station. The battery cell carrier 43 is used to transport the battery cell to the sealing station. The sealing nail waiting to be welded station, the nailing mechanism 44 has a picking part 441, the picking part 441 is used to pick up the sealing nails at the sealing nail supply station, the first visual positioning mechanism 45 is located between the nailing mechanism 44 and the sealing nail waiting to be welded station, and is used to collect the first position of the sealing nail relative to the picking part 441, the second visual positioning mechanism 46 is located on one side of the sealing nail waiting to be welded station along the third direction, and is used to collect the second position of the liquid injection hole on the battery cell, the sealing nail welding mechanism 47 is provided at the sealing nail welding station, and is used to weld the sealing nail in the liquid injection hole of the battery cell, wherein the nailing mechanism 44 is used to move the sealing nail from the first visual positioning mechanism 45 to the sealing nail waiting to be welded station according to the first position and the second position.

[0191] It can be understood that by setting the fourth battery cell conveyor line 41, the battery cell can be moved to the cleaning station, the laser cleaning device can clean the liquid injection hole of the battery cell, and then the battery cell is installed in the battery cell carrier 43, and the battery cell carrier 43 transports the battery cell to the sealing nail welding station. At this time, the relative position of the nail supply station and the sealing nail welding station is determined. Then, the battery cell carrier 43 transports the battery cell to the sealing nail welding station, and the second visual positioning mechanism 46 collects the second position of the battery cell liquid injection hole to determine the position deviation value between the second position and the sealing nail welding station, and then, the sealing nail is transported to the nail supply station, and the picking part 441 moves to the nail supply station to pick up the sealing nail at the nail supply station. , the picking part 441 is activated again to move to one side of the first visual positioning mechanism 45 along the third direction, and the first visual positioning mechanism 45 collects the first position of the sealing nail relative to the picking part 441 to determine the position deviation value of the sealing nail relative to the picking part 441. After the first visual positioning mechanism 45 completes the collection, the picking part 441 drives the sealing nail to move to the sealing nail welding station. At this time, the fourth production device 4 determines the actual nailing position of the sealing nail according to the first position, the second position and the relative position of the nail supply station and the sealing nail welding station, adjusts the position of the picking part 441 so that the sealing nail is in the actual nailing position, and the picking part 441 is released to accurately place the sealing nail at the battery cell liquid injection hole. In this way, the first position and the second position are respectively collected by the first visual positioning mechanism 45 and the second visual positioning mechanism 46 to determine the specific position of the sealing pin on the picking portion 441 and the specific position of the battery cell injection hole, thereby realizing a dual positioning function, solving the problem of position deviation of the sealing pin during the nailing process, improving the positioning accuracy of the sealing pin and the yield rate in subsequent welding work, and finally the sealing pin is welded to the injection hole of the battery cell by the sealing pin welding mechanism 47.

[0192] For example, in one embodiment of the present application, a coordinate system may be established to represent the first position, the second position, and the relative positions of the nail supply station and the sealing nail welding station.

[0193] Specifically, the relative positions of the nail supply station and the sealing nail welding station are (Xa, Ya), the first position is (Xb, Yb), and the second position is (Xc, Yc).

[0194] It should be noted that Xb represents the position offset of the sealing pin in the X-axis direction relative to the picking part 441, and Yb represents the position offset of the sealing pin in the Y-axis direction relative to the picking part 441; Xc represents the position offset of the battery cell liquid injection hole in the X-axis direction relative to the sealing pin welding station, and Yc represents the position offset of the battery cell liquid injection hole in the Y-axis direction relative to the sealing pin welding station.

[0195] By collecting the position offset of the sealing pin and the battery cell liquid injection hole, and combining it with the relative position of the pin supply station and the sealing pin welding station, the actual pin position (X, Y) can be obtained, where X=Xa+Xb+Xc; Y=Ya+Yb+Yc.

[0196] Furthermore, the nailing mechanism 44 also includes a first slide rail and a second slide rail. The first slide rail is located on one side of the nail supply station and the sealing nail welding station along the third direction, and extends along the first direction or the second direction. The second slide rail is slidably arranged on the first slide rail and extends along the first direction or the second direction. The extension direction of the second slide rail intersects with the extension direction of the first slide rail. The picking part 441 is slidably arranged on the second slide rail so that it can move from the nail supply station to the sealing nail welding station. It can be understood that the first slide rail and the second slide rail provide movement space for the picking part 441. For example, in one embodiment of the present application, the first slide rail is extended along the X-axis direction, and the second slide rail is extended along the Y-axis direction. In this way, the second slide rail slides on the first slide rail, and the picking part 441 slides on the second slide rail, so that the picking part 441 can move freely in the horizontal direction, ensuring the movement range of the picking part 441, so that the user can determine the specific positions of the battery carrier 43, the first visual positioning mechanism 45, and the second visual positioning mechanism according to his own needs, and provide sufficient space for the specific layout of the fourth production device 4.

[0197] It should be noted that the present application does not limit the specific extension direction of the first slide rail and the second slide rail. In another embodiment of the present application, the first slide rail can be extended along the Y-axis direction, and the second slide rail can be extended along the X-axis direction. During actual setting, it can be selected according to needs.

[0198] In addition, the present application also does not limit the angle between the first slide rail and the second slide rail. For example, when the first slide rail and the second slide rail are respectively extended along the X-axis direction and extended along the Y-axis direction, the angle between the first slide rail and the second slide rail is set to 90°; in other embodiments, the angle between the first slide rail and the second slide rail can also be set to 45°, 135° or other angles. It is only necessary to ensure that the extension direction of the first slide rail and the extension direction of the second slide rail intersect so that the two slide rails are not in a collinear state or a parallel state, so that the picking part 441 has at least two movable directions to ensure its range of motion.

[0199] Furthermore, in order to prevent the picking portion 441 from interfering with the sealing pins on the nail feeding station when it moves to the nail feeding station, thereby affecting the normal progress of the picking work, the picking portion 441 includes a base and a vacuum adsorption portion. The base is movably arranged on the second slide rail, and the vacuum adsorption portion is arranged at the lower end of the base and can move along the third direction. The vacuum adsorption portion is used to adsorb the sealing pins. With such an arrangement, when the base drives the vacuum adsorption portion to move to the nail feeding station, the vacuum adsorption portion is located on one side of the sealing pin along the third direction. At this time, the vacuum adsorption portion moves downward to abut against the sealing pin. The vacuum adsorption portion works to generate negative pressure between it and the sealing pin, so that the vacuum adsorption portion adsorbs the sealing pin. The vacuum adsorption portion then moves upward to complete the picking work of the sealing pin.

[0200] Of course, the picking-up portion 441 can also be set to other structures to pick up the sealing nails. For example, in one embodiment of the present application, the picking-up portion 441 includes the base and the magnetic adsorption portion. The magnetic adsorption portion is provided at the lower end of the base. When the picking-up portion 441 needs to pick up the sealing nails, the base drives the magnetic adsorption portion to move to the nail feeding station. The magnetic adsorption portion is located on one side of the sealing nail along the third direction. At this time, the magnetic adsorption portion works to adsorb the sealing nails at the feeding station onto the magnetic adsorption portion to complete the picking up of the sealing nails. With such a setting, the picking up of the sealing nails can also be achieved, and the user can set whether the magnetic adsorption portion needs to abut against the sealing nails according to the magnetic force of the magnetic adsorption portion.

[0201] In other embodiments of the present application, the picking portion 441 may also be configured as a gripping portion or other structural forms, and the present application does not impose any limitation thereto.

[0202] It should also be noted that in order to improve the working efficiency of the fourth production device 4, a plurality of the picking parts 441 are provided, and the plurality of the picking parts 441 are arranged at intervals. With such an arrangement, the plurality of the picking parts 441 can pick up a plurality of sealing nails at the same time, so as to simultaneously perform the positioning and nailing work of the plurality of sealing nails, thereby improving the working efficiency of the fourth production device 4.

[0203] Based on the above content, when the first visual positioning mechanism 45 collects the first position, in order to ensure the accuracy of the first position, the first visual positioning mechanism 45 is only used to collect one first position in turn. Therefore, when multiple sealing pins are performing positioning work at the same time, multiple first visual positioning mechanisms 45 are also provided. Multiple first visual positioning mechanisms 45 respectively collect the corresponding first positions of the sealing pins relative to the picking part 441, so as to improve the efficiency of the sealing pin positioning work.

[0204] Similarly, in order to enable multiple sealing nails to complete the nailing work at the same time, in an embodiment of the present application, the battery cell carrier 43 includes multiple carrying tooling, and the multiple carrying tooling is arranged at intervals and is located at the sealing nail welding station. Each carrying tooling is used to carry a battery cell. When the multiple picking parts 441 drive the sealing nail to move to the sealing nail welding station, each picking part 441 corresponds to one carrying tooling. At this time, the multiple picking parts 441 can place multiple sealing nails in multiple battery cell injection holes at the same time to complete the nailing work of multiple sealing nails at the same time.

[0205] Of course, when the battery cell carrier 43 includes multiple carrying tooling, when the second visual positioning mechanism 46 collects the first position, in order to ensure the accuracy of the second position, the second visual positioning mechanism 46 is also provided with multiple, and multiple second visual positioning mechanisms 46 are arranged at intervals. In this way, each second visual positioning mechanism 46 corresponds to only one battery cell injection hole to collect the corresponding second position.

[0206] Furthermore, since the second visual positioning mechanism 46 is located on one side of the welding station along the third direction, in order to avoid interference between the picking portion 441 and the second visual positioning mechanism 46 when the picking portion 441 moves to the sealing nail welding station, in one embodiment of the present application, the second visual positioning mechanism 46 is located on one side of the picking portion 441 along the third direction. When the picking portion 441 moves to the sealing nail welding station, the picking portion 441 is located between the second visual positioning mechanism 46 and the battery cell carrier 43. In this way, the picking portion 441 will not interfere with the second visual positioning mechanism 46.

[0207] In another embodiment of the present application, the second visual positioning mechanism 46 is provided on the first slide rail and is movable in the first direction or the second direction. With this arrangement, when the second visual positioning mechanism 46 needs to acquire the second position, the second visual positioning mechanism 46 moves to the side of the cell carrier 43 that is in the third direction to acquire the second position. After acquisition, the second visual positioning mechanism 46 moves again to leave the side of the cell carrier 43 that is in the third direction to avoid interference with the picking portion 441 when it moves to the sealing pin welding station.

[0208] In addition, in the process of the first visual positioning mechanism 45 collecting the first position, in order to improve the accuracy of the first position collected by the first visual positioning mechanism 45, in an embodiment of the present application, the first visual positioning mechanism 45 is also provided with a first supplementary light source on one side along the third direction. The first supplementary light source is used to illuminate the sealing nail on the picking part 441. The setting of the first supplementary light source can provide lighting for the first visual positioning mechanism 45 to improve the accuracy of the collection work performed by the first visual positioning mechanism 45.

[0209] Similarly, in order to improve the accuracy of the second position collected by the second visual positioning mechanism 46, the second visual positioning mechanism 46 is also provided with a second supplementary light source on the other side along the third direction. The second supplementary light source is used to illuminate the liquid filling hole of the battery cell. The setting of the second supplementary light source can provide lighting for the second visual positioning mechanism 46 to improve the accuracy of the collection work of the second visual positioning mechanism 46.

[0210] It should be noted that the present application does not limit the specific structural forms of the first supplementary light source and the second supplementary light source. For example, in one embodiment of the present application, the first supplementary light source and the second supplementary light source are both configured as circular light sources, and respectively avoid the fields of view of the first visual positioning mechanism 45 and the second visual positioning mechanism 46 to respectively illuminate the sealing pins and the battery cell filling holes.

[0211] In another embodiment of the present application, the first supplementary light source and the second supplementary light source are both arranged in a ring shape. With such an arrangement, the ring holes in the middle of the first supplementary light source and the second supplementary light source can respectively allow the fields of view of the first visual positioning mechanism 45 and the second visual positioning mechanism 46 to pass through, so as to avoid blocking the fields of view of the first visual positioning mechanism 45 and the second visual positioning mechanism 46, thereby affecting the normal acquisition work of the first visual positioning mechanism 45 and the second visual positioning mechanism 46.

[0212] In other embodiments of the present application, the first supplementary light source and the second supplementary light source may also be configured as other structural forms, which can be selected according to actual needs during actual configuration.

[0213] Of course, in the same embodiment, the specific structures of the first supplementary light source and the second supplementary light source may also be different from each other, and this application does not impose any limitation on this.

[0214] The fourth production device 4 also includes a nail feeding mechanism, which includes a supporting plate and a vibration part. The supporting plate is located on the nail feeding station. The upper end surface of the supporting plate is concave with a plurality of spaced accommodating grooves. One end of the plurality of accommodating grooves is connected to each other, and the other end is through-set. Each of the accommodating grooves is used to accommodate a plurality of sealing nails. The vibration part is connected to the open ends of the plurality of accommodating grooves. The vibration part can drive the supporting plate to move along a third direction. The vibration part is used to feed the sealing nail from the open end of the accommodating groove into the accommodating groove. In this way, the vibration part vibrates along the third direction to feed the sealing nail from the open end of the accommodating groove into the accommodating groove until the sealing nail moves to the connected end of the accommodating groove for pickup by the picking part 441.

[0215] The present application also proposes a production process for cylindrical battery cells. Based on the above-mentioned cylindrical battery cell production line 100 based on magnetic levitation transportation, the production process for cylindrical battery cells includes the following steps:

[0216] S100, flattening the battery cell using the first production device 1, and welding the positive collector to the positive electrode of the battery cell;

[0217] The magnetic levitation transport line transports the battery cells to the first production station, and the first production device 1 can flatten the battery cells and weld the positive collecting plate to the positive pole of the battery cells.

[0218] S200, using the second production device 2 to place the battery cell after flattening and welding the positive collector plate into the shell, and then sequentially perform positive electrode penetration welding, collector plate side wall welding, and negative collector plate welding;

[0219] The magnetic levitation transport line transports the battery cells from the first production station to the second production station. The second production device 2 can push the battery cells that have completed flattening and positive collector plate welding into the shell until the bottom of the shell, and then perform positive electrode penetration welding on the battery cells to fix the shell, positive collector plate and positive electrode of the battery cells, and then weld the flange of the negative collector plate to the inner wall of the shell, and finally weld the negative collector plate to the negative electrode of the battery cell.

[0220] S300, completing the welding of the negative collector plate and the negative electrode cover of the battery cell by the third production device 3;

[0221] The magnetic levitation transport line transports the battery cells from the second production station to the third production station, and the third production device 3 can weld the negative electrode cover and the shell of the battery cells into one.

[0222] S400 , using the fourth production device 4 to clean the liquid injection hole of the battery cell after the cover plate welding is completed and welding the sealing nail to the liquid injection hole of the battery cell.

[0223] The magnetic levitation transport line transports the battery cells from the third production station to the fourth production station. The fourth production device 4 first cleans the battery cell holes, and then welds the sealing pins to the liquid injection holes of the battery cells after cleaning.

[0224] In the technical solution of the present application, during the process of transporting battery cells on the magnetic levitation transport line, the first production device 1, the second production device 2, the third production device 3 and the fourth production device 4 perform processing tasks such as battery cell flattening, positive collector plate welding, battery cell shell insertion, positive electrode penetration welding, collector plate side wall welding, negative collector plate welding, battery cell negative electrode cover welding, battery cell injection hole cleaning and sealing nail welding to realize the automation, intelligence and efficient operation of the cylindrical battery cell production line 100, and realize the rapid and accurate production of cylindrical battery cells.

[0225] Furthermore, the step S100 includes:

[0226] Incoming materials are put on line, the battery cells are put on line to the first battery cell conveying line 12, and the positive current collecting tray is loaded onto the positive current collecting tray feeding unit 11;

[0227] The magnetic levitation transport line transports the battery cells to the first production station, and the first battery cell conveying line 12 transports the battery cells to the flattening station to prepare for flattening processing. The positive recording disk is put online to the positive collecting disk welding station and waits to be welded with the battery cells.

[0228] The battery cell is leveled, and the positive and negative poles of the battery cell are leveled in four stages by the leveling unit 13;

[0229] The flattening unit 13 performs four-stage flattening processing on both ends of the battery cell respectively to flatten the ends of the battery cell, thereby improving the flatness of the end surface of the battery cell and facilitating the welding of the positive collector plate welding unit 14.

[0230] Positive collector plate welding: welding the positive collector plate to the positive electrode of the battery cell after the battery cell is flattened by the positive collector plate welding unit 14;

[0231] The first battery cell conveying line 12 conveys the flattened battery cells to the positive collector plate welding station, installs the positive collector plate to the positive electrode of the battery cell, and welds it to the positive electrode of the battery cell.

[0232] Positive electrode encapsulation: the encapsulation unit 15 is used to encapsulate the positive electrode and the positive current collecting disc of the battery cell after the positive current collecting disc welding is completed.

[0233] The first battery cell conveying line 12 can convey the battery cells with the positive collector plates welded to the encapsulation station, and the encapsulation unit 15 performs encapsulation around the positive electrodes and the positive collector plates of the battery cells at the encapsulation station.

[0234] Positive electrode edge trimming: the edge trimming unit 16 trims the glue-coated positive electrode of the battery cell to the positive current collecting plate after the glue-coating process is completed;

[0235] The first battery cell conveying line 12 can convey the battery cells that have been coated with glue to the edge finishing station, and the edge finishing unit 16 edges the glue coating of the positive electrodes of the battery cells at the edge finishing station to the positive current collecting disk.

[0236] The battery cells are unloaded from the winding conveyor line after trimming.

[0237] After the trimming work is completed, the first battery cell conveying line 12 can convey the battery cells back to the magnetic levitation transport line to allow the battery cells to perform subsequent work.

[0238] In this embodiment, the first production device 1 sequentially performs the following operations on the battery cells: loading incoming materials online, leveling the battery cells, welding the positive collector plates, encapsulating the positive electrodes, trimming the positive electrodes, and removing the battery cells from the production line, so as to realize the automation and high efficiency of the positive collector plate welding work of the battery cells.

[0239] Furthermore, the positive collector plate welding unit 14 includes a plurality of pressing tools 141, a cell transfer tool 142, and a positive collector plate welding structure 144. The cell transfer tool 142 is used to transfer the cells to be welded into the plurality of pressing tools 141 and to transfer the welded cells out. The positive collector plate welding structure 144 can switch positions between the plurality of pressing tools 141.

[0240] The positive collector plate welding, welding the positive collector plate to the positive electrode of the battery cell by the positive collector plate welding unit 14, includes the following steps:

[0241] Obtaining information of cells to be welded on a plurality of pressing fixtures 141;

[0242] Among them, when there is a battery cell to be welded with a pressed positive collector plate in the pressing tooling 141, the positive collector plate welding unit 14 can identify it through an in-situ sensor or visual camera set corresponding to the pressing tooling 141, and feedback the information to be welded to the controller through the in-situ sensor or visual camera; it should be noted that the information to be welded at least includes the position information of the pressing tooling 141 where the battery cell to be welded exists.

[0243] According to the information to be welded, the positive collector plate welding structure 144 is controlled to switch to the pressing tool 141 to be welded, and the battery cells to be welded therein are welded;

[0244] Among them, taking the two pressing toolings 141 arranged along the first direction as an example, the positive collecting plate welding structure 144 performs welding operations at the pressing tooling 141 on the right side, and can move along the first direction under the drive of a linear motor or other driving module, that is, the positive collecting plate welding structure 144 can switch back and forth between the positions of the two pressing toolings 141.

[0245] During the welding process, after obtaining the welding information fed back by the in-situ sensor or visual camera at the pressing tool 141 on the left, the controller can control the linear motor or other drive module of the positive collector plate welding structure 144 to switch the positive collector plate welding structure 144 to the pressing tool 141 on the left. After that, the controller needs to continue to control the actuator action of the positive collector plate welding structure 144 to complete the welding operation of the battery cell to be welded in the pressing tool 141 on the left. After that, the above steps can be cyclically executed to switch and weld back and forth between the two pressing tools 141.

[0246] Obtaining information on cells to be unloaded and cells to be loaded on a plurality of pressing fixtures 141;

[0247] Among them, at the moment when the positive collecting plate welding structure 144 completes the welding operation of the battery cell to be welded (for example, the moment when the positive collecting plate welding structure 144 interrupts the laser output), the controller can obtain the information on unloading and loading corresponding to the pressing tool 141, which means that the welded battery cells in the pressing tool 141 need to be unloaded, and at the same time, preparations need to be made for reloading the pressing tool 141.

[0248] The cell transfer tooling 142 is controlled to move according to the information of materials to be unloaded and materials to be loaded, so as to transfer the welded cells out of the welded pressing tooling 141 and transfer the cells to be welded into the pressing tooling 141 to be loaded.

[0249] In the present embodiment, the positive collecting disk welding unit 14 includes a first battery cell conveyor line 12, the first battery cell conveyor line 12 has a loading conveying section and a unloading conveying section, and the battery cell transfer tooling 142 includes a loading pick-up part 441 and a unloading pick-up part 441; wherein, the battery cell transfer tooling 142 includes a loading pick-up part 441 and a unloading pick-up part 441, and the loading pick-up part 441 and the unloading pick-up part 441 are respectively driven by a double-motor linear motor to move in a first direction, so that they can respectively reach the positions of the loading conveying section, the unloading conveying section and the two pressing toolings 141; it should be noted that there are many structural forms of the loading pick-up part 441 and the unloading pick-up part 441, such as a clamping claw or a negative pressure nozzle, which is not limited in the present embodiment as long as it can stably pick up the battery cells;

[0250] After receiving the information about materials to be unloaded, the controller controls the driving components of the battery cell transfer tooling 142 to drive the picking portion 441 from other positions to the pressing tooling 141 to be unloaded, and picks up the welded battery cells therein. After receiving the information about materials to be loaded, the controller controls the driving components of the battery cell transfer tooling 142 to drive the picking portion 441 from other positions for picking up battery cells to be welded to the pressing tooling 141 to be loaded, and places the battery cells to be welded picked up by it into the pressing tooling 141.

[0251] It should be noted that, in some cases, the number of multiple pressing tools 141 can be three or more, and there may be a situation where the information to be unloaded, the information to be loaded, and the information to be welded are generated at different pressing tools 141 respectively. In other cases, the number of multiple pressing tools 141 is two, which means that the information to be loaded and the information to be unloaded may be generated successively at the same pressing tool 141, and the information to be welded may be generated at another pressing tool 141.

[0252] In the technical solution provided by the present application, since the positive collecting plate welding unit 14 is provided with a plurality of pressing fixtures 141, and the plurality of pressing fixtures 141 can be loaded and unloaded through the battery cell transfer fixture 142, when the information to be unloaded is obtained, it means that the battery cells on the corresponding pressing fixture 141 have been welded and need to be unloaded, and when the information to be loaded is obtained, it means that the welded battery cells on the corresponding pressing fixture 141 have been taken out, and the pressing fixture 141 is in an empty state, and needs to be loaded. By controlling the action of the battery cell transfer fixture 142, the pressing fixture 141 to be loaded can be efficiently loaded, and the pressing fixture 141 to be unloaded can be unloaded, thereby realizing the loading of the battery cells to be welded. The synchronous operation with the unloading of battery cells after welding shortens the waiting time. Under the efficient feeding guarantee of the battery cell transfer tooling 142 to multiple pressing toolings 141, the positive collecting plate welding structure 144 can directly switch to another pressing tooling 141 after welding the battery cells to be welded on one pressing tooling 141, thereby continuously welding the battery cells to be welded on each pressing tooling 141, thereby improving the laser utilization efficiency. At the same time, since a positive collecting plate welding structure 144 is realized to weld the battery cells in multiple pressing toolings 141, while ensuring the welding efficiency, the number of positive collecting plate welding structures 144 can be reduced, thereby reducing the assembly cost and occupied space of the positive collecting plate welding unit 14.

[0253] In some embodiments, the information on materials to be unloaded includes unloading material pickup instructions and unloading material transfer instructions, and the information on materials to be loaded includes loading material pickup instructions and loading material transfer instructions;

[0254] It should be noted that the generation of the unloading and picking instruction means that the welding of the battery cell has been completed, and the unloading and picking part 441 can grab it at any time; the generation of the unloading and transferring instruction means that the welded battery cell has been grabbed and separated from the pressing tool 141, and the unloading and picking part 441 can transfer it at any time; the generation of the loading and picking instruction means that the pressing tool 141 is in an idle state, and the loading and picking part 441 can grab the battery cell to be welded from the loading and conveying section to prepare for loading it; the generation of the loading and transferring instruction means that the loading and picking part 441 can transfer the grabbed battery cell to be welded to the controlled pressing tool 141 at any time.

[0255] Among them, there is a sequence relationship between the unloading material picking instruction and the unloading material transfer instruction, that is, the controller controls the unloading material picking part 441 to execute the unloading material picking instruction first and then execute the unloading material transfer instruction. There is a sequence relationship between the loading material picking instruction and the loading material transfer instruction, that is, the controller controls the loading material picking part 441 to execute the loading material picking instruction first and then execute the loading material transfer instruction.

[0256] According to the information of the materials to be unloaded, the cell transfer tool 142 is controlled to transfer the welded cells out of the welded pressing tool 141 and transfer the cells to be welded into the pressing tool 141 to be loaded, including:

[0257] According to the unloading and picking instructions, the unloading and picking part 441 is controlled to move, so as to pick up the welded battery cells from the welded pressing tool 141. At the same time, according to the real-time updated loading and picking instructions, the loading and picking part 441 is controlled to move, so as to pick up the battery cells to be welded from the loading and conveying section.

[0258] Among them, after the positive collecting plate welding structure 144 completes the welding of the battery cells to be welded in the pressing tooling 141, the controller obtains the unloading and picking instructions, thereby controlling the movement of the unloading and picking part 441. The specific control driving source is generally the driving cylinder that drives the unloading and picking part 441 to move, so as to pick up the welded battery cells from the pressing tooling 141 after welding. In the process of the unloading and picking part 441 picking up the welded battery cells, the loading and picking instructions are updated in real time, and the controller can simultaneously control the movement of the loading and picking part 441. The specific control driving source is generally the driving cylinder that drives the loading and picking part 441 to move, so as to pick up the battery cells to be welded from the loading and conveying section.

[0259] The unloading picking part 441 is controlled to move according to the unloading transfer instruction to transfer the picked-up welded battery cells to the unloading conveying section. At the same time, the loading picking part 441 is controlled to move according to the real-time updated loading transfer instruction to transfer the picked-up battery cells to be welded to the pressing tool 141 to be welded.

[0260] Among them, after the unloading picking part 441 picks up the welded battery cell, the controller controls the movement of the double-acting linear motor driving the unloading picking part 441 according to the unloading transfer instruction to transfer the unloading picking part 441 to the unloading conveying section, and controls the movement of the driving cylinder of the unloading picking part 441 after reaching the unloading conveying section to place the welded battery cell on the unloading conveying section; and in the process of the unloading picking part 441 transferring the welded battery cell, the loading transfer instruction is updated in real time, and the controller also controls the movement of the double-acting linear motor driving the loading picking part 441 to drive the loading picking part 441 to the pressing tool 141 to be loaded, and controls the movement of the driving cylinder of the loading picking part 441 after reaching the pressing tool 141 to be loaded, so as to place the battery cell to be welded on the pressing tool 141.

[0261] It should be noted that, in the action flow of the above technical solution, the loading and unloading actions of the loading and unloading picking part 441 and the unloading and unloading picking part 441 are based on the same pressing tool 141, that is, after the positive collecting plate welding structure 144 completes the welding of the battery cells in the pressing tool 141, the loading and unloading picking part 441 and the unloading and unloading picking part 441 simultaneously perform loading and unloading on the pressing tool 141, and the pressing tool 141 is reloaded with the battery cells to be welded, and the information to be welded is generated, waiting for the positive collecting plate welding structure 144 to switch back to continue welding, which is an action cycle.

[0262] Generally speaking, the loading and unloading time of the loading and unloading part 441 and the unloading and unloading part 441 is shorter than the welding time of the positive collecting plate welding structure 144. Therefore, when the positive collecting plate welding structure 144 is welding the battery cells to be welded in one of the pressing tooling 141, the loading and unloading part 441 and the unloading and unloading part 441 have enough time to load and unload the other pressing tooling 141, and can ensure that the positive collecting plate welding structure 144 is welding one of the pressing tooling 141. After the welding operation is completed on the battery cells to be welded in 41, another pressing tool 141 has been reloaded with battery cells to be welded (for example, after the welding machine structure has completed the welding operation on one pressing tool 141 on the right side, the loading and unloading picking part 441 and the unloading picking part 441 have completed the loading and unloading operations on the other pressing tool 141 on the left side), which ensures that the positive collecting plate welding structure 144 can switch to another pressing tool 141 for uninterrupted welding.

[0263] In the above technical solution, the battery cell transfer tool 142 is set to the loading and picking up part 441 and the unloading and picking up part 441 to move separately, and cooperate with the loading and conveying section and the unloading and conveying section corresponding to the first battery cell conveyor line 12. At the moment when the unloading and picking up part 441 picks up the battery cell after welding, the loading and picking up part 441 also picks up the battery cell to be welded from the loading and conveying section at the same time. In the process of the unloading and picking up part 441 picking up the battery cell after welding and transporting it to the unloading and conveying section, the loading and picking up part 441 is also synchronously transported to the pressing tool 141, so that the loading and unloading of the battery cell to be welded can be completed at the same time. Compared with the solution in which the cell transfer tooling 142 only includes one picking-up part 441 and the cells to be welded and the cells after welding are transported back and forth by only one picking-up part 441, this solution greatly improves the transportation efficiency of the cells to be welded and the cells after welding, can adapt to the welding switching rhythm of the positive collecting plate welding structure 144, and ensures the welding efficiency of the positive collecting plate welding unit 14. Moreover, the movement stroke of the loading picking-up part 441 and the unloading picking-up part 441 do not interfere with each other, and the risk of collision is relatively small.

[0264] In some embodiments, the information to be welded includes a to-be-welded instruction and a to-be-transferred instruction; wherein the to-be-welded instruction is usually generated before the to-be-transferred instruction, and the to-be-transferred instruction may be generated during the welding process of the positive collector plate welding structure 144;

[0265] It should be noted that the generation of the to-be-welded instruction means that there are already battery cells to be welded in the pressing tooling 141, and the positive collector plate welding structure 144 can weld them at any time; the generation of the to-be-transferred instruction means that the positive collector plate welding structure 144 is welding the battery cells to be welded in the pressing tooling 141, and after the welding of the positive collector plate welding structure 144 is completed, the welded battery cells can be transferred.

[0266] According to the information to be welded, the positive collector plate welding structure 144 is controlled to switch to the pressing tool 141 to be welded, and the battery cells to be welded therein are welded, including:

[0267] Control the positive collector plate welding structure 144 to switch to the pressing fixture 141 to be welded according to the welding instruction, and control the positive collector plate welding structure 144 to weld the battery cells to be welded in the pressing fixture 141 to be welded;

[0268] In which, when the controller controls the welding mechanism to switch from the pressed fixture 141 after welding to the pressed fixture 141 to be welded according to the welding instruction, the blanking picking part 441 is usually still executing the blanking picking instruction and the blanking transfer instruction.

[0269] According to the transfer instruction, the idle blanking and picking part 441 is controlled to be transferred to the top of the pressing tool 141 to be welded and wait for the welding of the battery cell to be welded to be completed.

[0270] Among them, after executing the blanking transfer instruction, the blanking picking part 441 changes its working state to the idle state. Since the pressing tool 141 to be welded is undergoing welding operation, it needs to blank the material after the welding is completed.

[0271] In the above technical solution, the controller controls the blanking and picking-up part 441 to be transferred in advance to the top of the welded pressing tool 141 to wait according to the transfer instruction (instead of transferring to the welded pressing tool 141 after welding is completed). The blanking and picking-up part 441 can immediately pick up and blank the welded battery cells in the welded pressing tool 141 after waiting for welding to be completed. Compared with controlling the blanking and picking-up part 441 to be transferred to the welded pressing tool 141 after welding is completed, this solution saves the transfer time of the blanking and picking-up part 441 and improves the blanking and transfer efficiency of the blanking and picking-up part 441.

[0272] It is understood that after the unloading and picking-up unit 441 completes unloading the welded battery cell, the loading and picking-up unit 441 also completes loading the battery cell to be welded. The controller can also control the idle loading and picking-up unit 441 to move to the top of the loading conveyor section to wait for the welding of the battery cell to be welded according to the transfer instruction, and immediately execute the above-mentioned loading and picking-up instruction after the welding of the battery cell to be welded is completed. This configuration also saves the transfer time of the loading and picking-up unit 441 and improves the loading and transfer efficiency of the loading and picking-up unit 441.

[0273] In some embodiments, the positive current collecting disc welding unit 14 further includes a positive current collecting disc feeding tool 143, and the pressing tool 141 includes a relative placement portion and a pressing portion, the placement portion is used to place the battery cell to be welded, and the positive current collecting disc feeding tool 143 is used to provide the positive current collecting disc to the pressing portion. The positive current collecting disc feeding tool 143 can automatically and efficiently provide the positive current collecting disc to multiple pressing tools 141, thereby ensuring the feeding efficiency of the positive current collecting disc, wherein the pressing tool 141 can press the positive current collecting disc and the end of the battery cell to be welded together through the placement portion and the pressing portion;

[0274] Based on the above structure, the welding method further includes:

[0275] Get the positive collecting plate feeding information;

[0276] Among them, the positive collector plate feeding information is generated after the positive collector plate in the pressing tool 141 is welded to the battery cell by the positive collector plate welding structure 144. The positive collector plate feeding information means that the positive collector plate on the pressing part has been welded to the battery cell, and after welding, the battery cell has been transported away by the battery cell transport tool 142, thereby freeing up the position of the placement part.

[0277] The positive current collecting disk feeding tooling 143 is controlled to operate according to the positive current collecting disk feeding information so as to feed the positive current collecting disk to the holding part.

[0278] Among them, the controller can control the action of the positive collecting disc feeding tooling 143 according to the positive collecting disc feeding information, thereby executing the action of feeding the positive collecting disc to the holding part; since there are many specific structures of the positive collecting disc feeding tooling 143, this scheme does not limit the specific action flow of the controller controlling the positive collecting disc feeding tooling 143, as long as it can complete the action of feeding the positive collecting disc to the holding part.

[0279] It should be explained that in this technical solution, the feeding speed of the positive collecting tray feeding tool 143 is faster than the loading speed of the battery cell transfer tool 142, so as to ensure that the positive collecting tray can wait on the holding part for the battery cells to be welded to be loaded to the placement part.

[0280] In the above technical solution, after the positive collector plate welding structure 144 completes the welding action, the positive collector plate has been welded to the battery cell. After the battery cell transfer tooling 142 transfers the welded battery cell away from the pressing tooling 141, the pressing part is in an empty state. At this time, the positive collector plate feeding information is generated, and the controller controls the positive collector plate feeding tooling 143 to move according to the positive collector plate feeding information, thereby re-loading the positive collector plate to the pressing part to wait for the battery cell transfer tooling 142 to load the battery cell to be welded to the placement part, ensuring that the battery cell to be welded can be pressed with the positive collector plate without waiting after being loaded to the placement part, thereby ensuring the pressing efficiency of the pressing tooling 141.

[0281] Furthermore, in some embodiments, a pressing gap is formed between the pressing portion and the placement portion, and the pressing portion is movable toward the placement portion, thereby changing the size of the pressing gap and simultaneously pressing the positive current collecting plate onto the battery cell to be welded;

[0282] According to the positive collecting disc feeding information, the positive collecting disc feeding tool 143 is controlled to feed the positive collecting disc to the holding part, including:

[0283] According to the positive collector plate feeding information, the positive collector plate feeding tool 143 is controlled to feed the positive collector plate into the pressing gap;

[0284] Among them, the positive collecting disc feeding tooling 143 feeds the positive collecting disc into the pressing gap, and its specific action includes flipping the picking part 441 along the axis in the first direction to flip the positive collecting disc and extend it into the pressing gap, so that the positive collecting disc and the holding part are opposite to each other in the direction toward the placement part, that is, they are opposite in the second direction.

[0285] The pressing and holding part is controlled to open the pressing gap after receiving the positive collecting disc, and the positive collecting disc feeding tooling 143 is controlled to withdraw from the pressing gap.

[0286] Among them, after the positive collecting disc feeding tooling 143 feeds the positive collecting disc into the pressing gap, the control can immediately control the holding part to move toward the placement part to receive the positive collecting disc on the positive collecting disc feeding tooling 143. After that, the controller will also control the holding part to move away from the placement part to open the pressing gap. At this time, the flipping and picking part 441 of the positive collecting disc feeding tooling 143 has enough space to flip out of the pressing gap.

[0287] In the above technical solution, by controlling the pressing part to move away from the placing part, the size of the pressing gap can be changed, thereby facilitating the positive current collecting disc feeding tooling 143 to extend into the pressing gap to feed the pressing part, and the movable stroke of the positive current collecting disc feeding tooling 143 can play a role of giving way. After the positive current collecting disc feeding tooling 143 completes feeding and exits the pressing gap, the pressing part can move close to the placing part, thereby pressing the positive current collecting disc to the end of the battery cell to be welded in the placing part. The movable structural form of this pressing part is simple and efficient.

[0288] In other embodiments, after controlling the positive current collecting disk feeding tool 143 to feed the positive current collecting disk to the holding portion according to the positive current collecting disk feeding information, the welding method further includes:

[0289] Check whether the battery cells to be welded have been transferred into the pressing tool 141 to be loaded;

[0290] Among them, there are many ways and specific structures to detect whether the battery cells to be welded have been transferred into the pressing tool 141 to be loaded. For example, it can be identified and detected by an in-situ sensor or a visual camera, and this application does not limit it; because the feeding speed of the positive collecting tray feeding tool 143 is faster than the loading speed of the battery cell transfer tool 142, it is necessary to continuously detect whether the battery cells to be welded have been transferred into the pressing tool 141 after the positive collecting tray feeding tool 143 loads the positive collecting tray to the holding part, so as to respond in the first time.

[0291] When the battery cells to be welded have been transferred to the pressing tool 141 to be loaded, the positive collector plate pressing information is generated;

[0292] When the battery cells to be welded are transferred into the pressing tool 141 to be loaded, it means that the battery cells to be welded and the positive collector plate are ready and the pressing operation can be performed, so the positive collector plate pressing information is generated.

[0293] The pressing tool 141 to be welded is controlled to move according to the positive collector plate pressing information, so that the positive collector plate on the pressing portion is pressed onto the end of the battery cell to be welded on the placing portion.

[0294] Among them, after receiving the positive collector disc pressing information, the controller can control the action of the pressing tool 141, which specifically controls the action of the driving cylinder of the driving pressing part to press the positive collector disc and the end of the battery cell to be welded together; in this technical solution, since the positive collector disc is first loaded to the pressing part, the battery cell to be welded has been transferred into the pressing tool 141 to be loaded through real-time detection, and the action of the pressing tool 141 can be controlled by the controller at the first time, thereby ensuring the pressing efficiency of the pressing tool 141 on the battery cell to be welded and the positive collector disc, and reducing the waiting time of the positive collector disc welding structure 144.

[0295] Furthermore, in some embodiments, the pressing tool 141 further includes a pushing portion, which is arranged opposite to the holding portion so that the placement portion is located therebetween. The pushing portion is movable toward the placement portion, that is, movable in the second direction. The pushing portion can push the battery cell to be welded on the placement portion toward the positive current collecting disk on the holding portion during its movable stroke, thereby completing the pressing action.

[0296] According to the positive collector plate pressing information, the pressing portion of the pressing tool 141 to be welded is controlled to move so that the positive collector plate on the pressing portion is pressed onto the end of the battery cell to be welded on the placement portion, including:

[0297] According to the positive current collecting disc pressing information, the pressing portion and the pushing portion of the pressing tool 141 to be welded are controlled to move toward each other so that the positive current collecting disc on the pressing portion is pressed onto the end of the battery cell to be welded on the placement portion.

[0298] It can be understood that the positive collector plate is pushed to be pressed onto the battery cell to be welded on the placement portion by the pressing portion alone. Firstly, the placement portion needs to be able to limit the movement of the battery cell to be welded in the second direction, which means that the placement portion needs to be provided with a corresponding structure to limit the movement of the battery cell to be welded, which increases the complexity of the placement portion structure. Secondly, the pressing portion needs to move away from the placement portion in the previous action to open the pressing gap so that the positive collector plate feeding tooling 143 can exit the pressing gap. Therefore, the pressing portion needs to move a larger stroke in the subsequent pressing process to reach the placement portion.

[0299] In this technical solution, after the pressing part receives and grabs the positive current collecting disc from the positive current collecting disc feeding tooling 143 and detects that the battery cell to be welded is placed on the placement part, the controller can immediately control the pushing part to push the battery cell to be welded close to the pressing part. At the same time, the controller can also control the pressing part to cooperate with the pushing part to move towards each other, so that the movement stroke of the pressing part and the pushing part is reduced, so that the positive current collecting disc can be pressed onto the battery cell to be welded in a shorter time, thereby improving the pressing efficiency.

[0300] In one embodiment of the present scheme, the above technical scheme has a cyclic operation process. After the battery cell transfer tool 142 transfers the welded battery cell away from the pressing tool 141, the pressing tool 141 is transformed into the pressing tool 141 to be welded, and the pressing part is in an empty state. At this time, the positive collecting disc feeding information is generated, and the controller controls the positive collecting disc feeding tool 143 to move according to the positive collecting disc feeding information. The positive collecting disc feeding tool 143 extends into the pressing gap to feed the pressing part. After that, the controller controls the pressing part to move toward the positive collecting disc feeding tool 143 to receive the positive current collecting disc. The current collecting disc then moves away from the positive current collecting disc feeding tooling 143, and the controller continues to control the movement of the positive current collecting disc feeding tooling 143 to exit the pressing gap. Subsequently, the positive current collecting disc welding unit 14 continues to detect whether the battery cell to be welded has been transferred to the placement portion of the pressing tooling 141 to be loaded. If the battery cell to be welded is detected, the positive current collecting disc welding unit 14 generates positive current collecting disc pressing information. The controller controls the holding portion and the pushing portion of the pressing tooling 141 to be welded to move toward each other according to the positive current collecting disc pressing information, so that the positive current collecting disc on the holding portion is pressed onto the end of the battery cell to be welded on the placement portion.

[0301] In the above operation process, if the positive collector disc welding structure 144 completes welding of the battery cell in another pressing tool 141, the positive collector disc welding unit 14 immediately generates a waiting-for-welding instruction, and the controller controls the positive collector disc welding structure 144 to switch to the pressing tool 141 to be welded according to the waiting-for-welding instruction. After the controller controls the pressing portion and the pushing portion of the pressing tool 141 to be welded to move toward each other according to the positive collector disc pressing information, so that the positive collector disc on the pressing portion is pressed onto the end of the battery cell to be welded on the placement portion, the controller immediately controls the positive collector disc welding structure 144 to weld the battery cell to be welded that has completed pressing in the pressing tool 141 to be welded;

[0302] In the above operation process, the positive collector plate welding unit 14 immediately generates a waiting-for-welding instruction. At the same time, if the loading and picking-up portion 441 and the unloading and picking-up portion 441 complete the loading and unloading actions of the battery cell in another pressing tool 141, it is in an idle state, and the positive collector plate welding unit 14 immediately generates a waiting-for-transfer instruction. The controller controls the unloading and picking-up portion 441 to move according to the waiting-for-transfer instruction to transfer it to the top of the pressing tool 141 to be welded. The controller can also control the loading and picking-up portion 441 to move according to the waiting-for-transfer instruction to transfer it to the top of the loading and conveying section. After the positive collector plate welding structure 144 completes the welding of the battery cell to be welded in the pressing tool 141 to be welded, the positive collector plate welding unit 1 Then, the information of materials to be loaded and materials to be unloaded is generated. The controller can control the unloading picking part 441 to pick up the welded cells according to the unloading picking instruction, and control the loading picking part 441 to pick up the cells to be welded on the loading conveying section according to the real-time updated loading picking instruction. After that, the controller can control the unloading picking part 441 to transfer the welded cells to the unloading conveying section according to the unloading transfer instruction, and control the loading picking part 441 to transfer the cells to be welded to the placement part of the pressing tool 141 according to the loading transfer instruction. At this time, the positive collector plate welding unit 14 detects the cells to be welded and generates positive collector plate pressing information, and the above steps are executed cyclically.

[0303] In the technical solution provided by the present application, since the positive collecting plate welding unit 14 is provided with a plurality of pressing fixtures 141, and the loading and unloading picking portion 441 and the unloading picking portion 441 in the battery cell transfer fixture 142 can efficiently load and unload the plurality of pressing fixtures 141, the loading of the battery cells to be welded and the unloading of the battery cells after welding can be realized synchronously, thereby shortening the waiting time;

[0304] With the efficient material supply guarantee of the battery cell transfer tooling 142 to multiple pressing toolings 141, the positive collecting plate welding structure 144 can directly switch to another pressing tooling 141 after welding the battery cells to be welded on one pressing tooling 141, so that one positive collecting plate welding structure 144 can weld the battery cells in multiple pressing toolings 141, that is, this solution splits the traditional single welding station into multiple welding stations, and uses a positive collecting plate welding structure 144 for alternating welding, making full use of the laser. Compared with the traditional positive collecting plate welding production line that requires eight laser welding heads to perform welding on eight welding stations respectively, under the premise of ensuring welding efficiency, the positive collecting plate welding structure 144 proposed in the application solution only needs to set two laser welding heads to weld the four battery cells to be welded on the same pressing tooling 141 in groups of two, that is, it can also meet the welding requirements of eight or more welding stations, but reduces the number of laser welding heads set, which also reduces the assembly cost and occupied space of the positive collecting plate welding unit 14.

[0305] It has been verified in actual application that based on the welding method proposed in this scheme, the positive collecting plate welding structure 1445 takes 3.2 seconds to process four battery cells to be welded on a pressing tool 1412, and only takes 7.4 seconds to process eight battery cells to be welded on two pressing tools 1412, with a cycle time of 64.86, which is 5% more efficient than traditional welding lines.

[0306] On the other hand, the positive collecting plate welding unit 14 includes a first battery cell conveyor line 12, which has a loading conveying section and a unloading conveying section. The loading conveying section, multiple pressing tooling 141, and the unloading conveying section are arranged in a row along the first direction; the battery cell transfer tooling 142 and the positive collecting plate welding structure 144 are both movable along the first direction and are respectively arranged on both sides of the pressing tooling 141 along the second direction; the second direction is set at an angle to the first direction.

[0307] It should be noted that the first battery cell conveyor line 12 can have many structural forms, for example, it can be in the form of a belt conveyor line, or it can be in the form of a magnetic levitation conveyor line. It can be understood that the magnetic levitation conveyor line has the advantages of fast and precise positioning, and the embodiment of the present application does not limit its specific structure; due to the existence of the battery cell transfer tooling 142, the first battery cell conveyor line 12 and the multiple pressing tooling 141 can have many relative positions, which can be set far apart or adjacent to each other, as long as the conveying efficiency of the battery cell transfer tooling 142 can adapt to the welding rhythm of the positive collector disc welding structure 144, this embodiment does not limit this; the function of the pressing tooling 141 is to press the positive collector disc and the end of the battery cell together, so as to facilitate the welding operation of the positive collector disc welding structure 144 on it, and the structural form of the pressing tooling 141 There are many forms, which are not limited in this embodiment; there are many structural forms of the battery cell transfer tooling 142, for example, a multi-axis robotic arm can be used in combination with a clamp or a suction cup to complete the transfer of the battery cell, or a linear motion module can be used in combination with a clamp or a suction cup to complete the transfer of the battery cell, which is not limited in this application; there are also many structural forms of the positive collecting plate feeding tooling 143, as long as it can provide positive collecting plates for multiple pressing tooling 141, which is not limited in this embodiment; the specific structure of the positive collecting plate welding structure 144 adopts the form of laser welding, and its movement form can be completed by a linear motor drive, or it can be completed by other linear drive modules, which is not limited in this embodiment; the second direction and the first direction can be set at any angle in principle, but under normal circumstances, it is better to set the second direction and the first direction perpendicular to each other in the horizontal plane.

[0308] According to the above technical solution, the loading and conveying section, multiple pressing tools 141, and the unloading and conveying section are arranged in rows along the first direction, and the battery cell transfer tooling 142 and the positive collecting plate welding structure 144 are respectively arranged on both sides of the pressing tooling 141 along the second direction, and both move along the first direction, making full use of the installation space and activity space on both sides of the pressing tooling 141 along the second direction, so that the activity strokes of the battery cell transfer tooling 142 and the positive collecting plate welding structure 144 are independent of each other, reducing the risk of collision between the battery cell transfer tooling 142 and the positive collecting plate welding structure 144, and improving the stability of the operation of the positive collecting plate welding unit 14, not only that, because the loading and conveying section, multiple pressing tools 141, and the unloading and conveying section are arranged in rows along the first direction, and the battery cell transfer tooling 142 also makes a linear motion in the first direction, it can efficiently transfer battery cells between the loading and conveying section, multiple pressing tools 141, and the unloading and conveying section, thereby ensuring the conveying efficiency of the high-speed first battery cell conveying line 12.

[0309] Furthermore, in some embodiments, the positive collector plate welding unit 14 further includes a positive collector plate feeding tool 143, which is used to provide positive collector plates to the multiple pressing tools 141. The positive collector plate feeding tool 143 can automatically and efficiently provide positive collector plates to the multiple pressing tools 141, thereby ensuring the loading efficiency of the positive collector plates.

[0310] The battery cell transfer tooling 142 can adopt a one-way round-trip transfer form, but this transfer form can only complete the loading of battery cells from the first battery cell conveyor line 12 to the pressing tooling 141, or unloading from the pressing tooling 141 to the first battery cell conveyor line 12 in a single trip. Therefore, its transfer efficiency is limited, and it is difficult to meet the efficient operation requirements of the positive collecting plate welding structure 144. In view of this, in some embodiments, the first battery cell conveyor line 12 has a loading conveying section and a unloading conveying section; the battery cell transfer tooling 142 includes a loading picking part 441 and a unloading picking part 441, and the loading picking part 441 moves between the loading conveying section and multiple pressing tooling 141 to pick up the battery cells in the loading conveying section in turn to multiple pressing tooling 141; the unloading picking part 441 moves between multiple pressing tooling 141 and the unloading conveying section to pick up the battery cells in multiple pressing tooling 141 in turn to the unloading conveying section.

[0311] It should be noted that there are many structural forms of the loading and picking up part 441 and the unloading and picking up part 441, for example, they can be in the form of a clamp or a negative pressure nozzle. This embodiment does not limit this, as long as they can stably pick up the battery cells.

[0312] According to the above technical solution, the battery cell transfer tooling 142 is set to the form of a loading and picking part 441 and a unloading and picking part 441 in coordination with each other, which can simultaneously complete the loading operation of the incoming battery cells before welding and the unloading operation of the battery cells after welding. The transfer efficiency of the battery cells is greatly improved, and it can adapt to the efficient operation rhythm of the positive collecting plate welding structure 144.

[0313] Specifically, in some embodiments, the loading and conveying section, multiple pressing tools 141 and the unloading and conveying section are arranged along the first direction; the battery cell transfer tool 142 includes a double-acting linear motor, which is arranged corresponding to the multiple pressing tools 141 and has two first movable seats that move along the first direction; the loading and picking part 441 and the unloading and picking part 441 are respectively arranged on the two first movable seats, and are respectively arranged corresponding to the loading and conveying section and the unloading and conveying section.

[0314] It should be noted that the first direction is usually set to a direction within a horizontal plane.

[0315] According to the above technical solution, the battery cell transfer tooling 142 is set in the form of a double-acting linear motor, which can drive the loading and picking part 441 and the unloading and picking part 441 to move smoothly and efficiently, thereby ensuring the transfer efficiency of the battery cells. At the same time, since the loading and conveying section, multiple pressing tooling 141 and the unloading and conveying section are arranged along the first direction, and the double-acting linear motor is also driven along the first direction, the space occupied by the positive collecting plate welding production line is relatively small.

[0316] In some embodiments, the pressing tool 141 includes a placing portion and a holding portion opposite to each other along the second direction to form a pressing gap therebetween. The placing portion is used to place the battery cell along the second direction, and the holding portion is used to grab the positive current collector and is movable along the second direction. The holding portion can press the positive current collector and the end of the battery cell in the pressing gap during its movable stroke; the positive current collector feeding tool 143 is used to provide the positive current collector to the holding portion; the battery cell transfer tool 142 is used to place the battery cell on the placing portion or pick up the battery cell from the placing portion.

[0317] It should be noted that the second direction is usually set as another direction in the horizontal plane, which is set at an angle to the first direction; the placement portion is used to place the battery cell, so a recess adapted to the shape of the battery cell is usually formed thereon to limit the battery cell; the holding portion is used to grab the positive current collector plate so that the positive current collector plate after placement is facing the end of the battery cell. The way of placing the positive current collector plate can be in the form of clamping the positive current collector plate or in the form of sucking the positive current collector plate, but it should be considered that it cannot affect the welding of the positive collector plate by the positive collector plate welding structure 144.

[0318] According to the above technical solution, the size of the pressing gap can be changed by the movement of the pressing part along the second direction, thereby facilitating the positive collecting disc feeding tooling 143 to extend into the pressing gap and feed the material to the pressing part. The movement of the positive collecting disc feeding tooling 143 can play a role of giving way. After the positive collecting disc feeding tooling 143 completes feeding and exits the pressing gap, the pressing part can continue to move toward the placement part, thereby pressing the positive collecting disc to the end of the battery cell in the placement part. The movable structural form of this pressing part is simple and efficient.

[0319] Furthermore, in some embodiments, the positive collecting disc feeding tooling 143 includes a flipping and picking portion 441 provided corresponding to the pressing tooling 141, and the flipping and picking portion 441 is flipped along the axis in the first direction so as to be able to enter the pressing gap during its flipping stroke; the pressing portion can be docked with the flipping and picking portion 441 within its active stroke to receive the positive collecting disc from the flipping and picking portion 441.

[0320] It should be noted that after the positive collecting tray is loaded onto the positive collecting tray feeding tooling 143, it is usually in a horizontal position, and after the positive collecting tray is fed to the holding part, it is usually in a vertical position. Therefore, the loading process of the positive collecting tray is usually a process of converting from a horizontal position to a vertical position, so it needs to be flipped, and the role of the flipping picking part 441 is precisely this. The specific form of the flipping picking part 441 can be a clamp or a negative pressure suction nozzle, and this embodiment does not limit this.

[0321] According to the above technical solution, the flipping and picking part 441 is used to convert the horizontally placed positive collecting disk into an upright position, and the holding part moves back and forth along the second direction. On the one hand, it can receive the positive collecting disk from the flipping and picking part 441, and on the other hand, it can make room for the movement of the flipping and picking part 441, thereby ensuring that the structure of the pressing tooling 141 is more compact while avoiding interference with the movement of the flipping and picking part 441.

[0322] Specifically, in some embodiments, the positive collecting tray feeding tooling 143 also includes a feeding structure, multiple transition structures and multiple transfer structures. The feeding structure is used to provide the positive collecting tray. The transition structure has a transition placement portion corresponding to the flipping picking portion 441. The flipping picking portion 441 can contact the transition placement portion during its flipping stroke to pick up the positive collecting tray in the transition placement portion. The transfer structure is used to move between the feeding structure and the corresponding transition structure to transfer the positive collecting tray to the corresponding transition placement portion.

[0323] It should be noted that the transition placement portion is aligned with the flipping and picking portion 441 for transitionally placing the positive collecting disc. There are various structural forms as long as they can play a role in positioning the positive collecting disc.

[0324] According to the above technical solution, the transfer structure can horizontally transfer the positive collecting disk on the distant feeding structure to the transition placement part, and the flipping picking part 441 can flip the positive collecting disk on the transition placement part to the pressing gap. The transition placement part plays a transition role between the horizontal transfer and the flipping transfer of the positive collecting disk. The action form of the positive collecting disk feeding tooling 143 is simple and efficient.

[0325] More specifically, in some embodiments, the placement portion and the pressing portion correspond one-to-one to form a placement and pressing group, and multiple placement and pressing groups are arranged in one pressing tool 141 and arranged along the first direction; the flipping and picking portion 441 corresponds one-to-one to the transition placement portion to form a transition flipping group, and multiple transition flipping groups are arranged corresponding to the placement and pressing group; the feeding structure includes a variable distance mechanism, and the variable distance mechanism has multiple variable distance positioning portions, and the variable distance positioning portions are used to place the positive collecting disk; the transfer structure has a transfer picking portion 441 corresponding to multiple transition placement portions, and within the active range of the transfer structure, the multiple transfer picking portions 441 can transfer the positive collecting disks on the corresponding multiple variable distance positioning portions to multiple transition placement portions.

[0326] It should be noted that, for the above solution, the battery cell transfer tooling 142 can also use multiple loading and picking parts 441 to load multiple placement and pressing groups at the same time, or use a single loading and picking part 441 to load each placement and pressing group one by one.

[0327] According to the above technical solution, the spacing between the multiple variable-pitch positioning parts of the variable-pitch mechanism after the pitch is changed is equivalent to the spacing between two adjacent placement and pressing groups and two adjacent transition flipping groups. Its function is to conveniently receive multiple incoming positive collecting discs and position them to meet the spacing requirements of multiple placement and pressing groups, so that multiple positive collecting discs can be loaded at the same time, and then multiple positive collecting discs can be pressed with battery cells at the same time, thereby improving the pressing efficiency of battery cells and positive collecting discs.

[0328] In other embodiments, the pressing tool 141 further includes a pushing portion, which is opposite to the holding portion in the second direction so that the placement portion is located therebetween, and the pushing portion is movable in the second direction to push the battery cell to the holding portion.

[0329] According to the above technical solution, after the pressing part receives and grabs the positive current collecting disc from the positive current collecting disc feeding tool 143, the pushing part can immediately push the battery cell close to the pressing part, so that the battery cell and the positive current collecting disc are pressed together, thereby improving the pressing efficiency.

[0330] It is worth mentioning that after the battery cell is transferred to the placement portion, it is required to remain concentric with the positive collector disk on the pressing portion, and the diameters of different types of battery cells are different. Therefore, some types of battery cells may not be able to maintain concentric alignment and pressing with the positive collector disk, thereby limiting the scope of application of the positive collector disk welding unit 14. In view of this, in some embodiments, the pressing tool 141 also includes a centering clamping mechanism arranged in the pressing gap, and the centering clamping mechanism includes at least three centering clamping parts, and at least three centering clamping parts are distributed along the circumference of the pressing portion and are movable along the radial direction of the pressing portion to perform centering pressing on the battery cell inserted therein.

[0331] It should be noted that the centering clamping mechanism can be fixedly arranged in the pressing gap, or can be arranged in the pressing gap as the pressing part moves, and this is not limited to this in the present embodiment; there can be multiple driving methods for at least three centering clamping parts, for example, they can be driven to move separately by three driving cylinders, or they can be driven in other forms, and this is not limited to this in the present embodiment; since the centering clamping mechanism is in the pressing gap, therefore, in the process of the pushing part pushing the battery cell toward the pressing part, the battery cell can extend between the at least three centering clamping parts, and in the moving stroke of the at least three centering clamping parts, the battery cell can be positioned to a position concentric with the positive collecting disk.

[0332] According to the above technical solution, the three centering clamping parts can position any type of battery cell to a position concentric with the positive collecting disk on the pressing part, greatly improving the applicability of the pressing tool 141 and making it adaptable to different types of battery cells.

[0333] Specifically, in some embodiments, the centering clamping mechanism also includes a mounting seat, two hinged parts and a driving part, and the mounting seat is fixed relative to the pressing part; the two hinged parts are hingedly arranged on the mounting seat along the axis in the second direction, and are opposite to each other along the first direction, and the two ends of the hinged part are respectively arranged as the driving end and the driven end, and the two driven ends are arranged close to the pressing part; the driving part is arranged between the two driving ends and is movable along the third direction, and the driving part can squeeze the two driving ends away from each other within its movable stroke close to the pressing gap, so as to drive the two driven ends closer to each other; at least three centering clamping parts are respectively arranged on the driving part and the two driven ends.

[0334] It should be noted that the first direction, the second direction and the third direction are arranged at angles with each other. It should be understood that the first direction and the third direction belong to different radial directions of the pressing part; the fixed arrangement of the mounting seat and the pressing part means that the centering clamping mechanism can move with the pressing part; the middle part of the hinged part is hinged to the mounting seat, so that a driving end and a driven end can be formed at both ends respectively; the driving part can squeeze the two driving ends away from each other within its stroke close to the pressing gap, and based on the lever principle, the two driven ends approach each other. At this time, the three centering clamping parts respectively arranged on the driving part and the two driven ends approach each other along the radial direction of the pressing part, thereby completing the centering clamping of the battery cell.

[0335] According to the above technical solution, the three centering clamping parts can be driven to move by the action of one driving part, which reduces the number of driving sources, simplifies the structure of the centering clamping mechanism, and reduces the driving cost.

[0336] More specifically, in some embodiments, the two driving ends still maintain a tendency to approach each other under the reset drive of the reset part. With such an arrangement, when the driving part is away from the pressing gap, the two driving ends can still approach each other, thereby driving the two driven ends to move away from each other, that is, realizing the mutual distance between the three centering clamping parts, thereby releasing the centering clamping of the battery cell.

[0337] It should be noted that the reset portion includes many structures, such as a torsion spring provided on the rotating shaft of the hinge portion, or a tension spring connecting the two driving ends.

[0338] More specifically, in other embodiments, at least three centering clamping parts are arranged to rotate along the axis located in the second direction. With this arrangement, the centering clamping parts can achieve the purpose of unloading force by rotating themselves during the contact process with the battery cell, so as to avoid the centering clamping parts scratching the battery cell.

[0339] In some embodiments, the pressing tool 141 includes a positive collector disc clamping mechanism, which includes a pressing seat and a plurality of limit clamping parts. The pressing seat corresponds to the placement part and is movably arranged along the second direction. A guide part is formed on the pressing seat, and the guide part is arranged circumferentially around the axis of the second direction to form a clamping cavity therebetween, and the clamping cavity is used for the positive collector disc to extend into; a plurality of limit clamping parts are arranged on the circumferential side of the guide part and are movable radially along the guide part, and the limit clamping part can extend into the clamping cavity within its movable stroke to clamp the positive collector disc; wherein, the pressing part includes a pressing seat.

[0340] It should be noted that the guide portion can be arranged in a continuous or segmented manner; there are various ways to drive the multiple limit clamping portions, for example, they can be driven by multiple driving cylinders respectively, or two of the limit clamping portions can be driven by a clamping cylinder, which is not limited in this embodiment.

[0341] According to the above technical solution, the clamping cavity defined by the guiding part can accurately accommodate the positive current collecting disc so as to accurately align with the battery cell. Moreover, under the clamping action of multiple limiting clamping parts, the positive current collecting disc can be stably maintained in the clamping cavity to ensure stable pressing between the positive current collecting disc and the battery cell.

[0342] It is worth mentioning that after the limiting clamping part completes the clamping action of the positive collector disc, the positive collector disc still has the freedom to rotate along the axis in the second direction, and the welding of the positive collector disc and the battery cell also has circumferential position requirements to ensure that the positive collector disc welding structure 144 can weld the positive collector disc and the physical structure of the battery cell. Considering that the positive collector disc usually has some matching recesses such as holes and grooves, in order to prevent the positive collector disc from rotating and dislocating in the clamping cavity, in this embodiment, a stop-rotation protrusion is also formed on the holding seat, and the stop-rotation protrusion is arranged corresponding to the clamping cavity to cooperate with the matching recess on the positive collector disc to limit the rotation of the positive collector disc. After the positive collector disc is clamped by the holding seat, the stop-rotation protrusion on the holding seat can align and cooperate with the matching recess on the positive collector disc, thereby completely limiting the rotational freedom of the positive collector disc and ensuring a smooth welding process.

[0343] In order to guide the positive current collecting disc, a guiding slope is formed on the end face of the guiding portion facing the placement portion, and the guiding slope extends toward the clamping cavity. With such an arrangement, when the positive current collecting disc enters the clamping cavity, the guiding slope can guide it, allowing it to enter the clamping cavity smoothly, thereby improving the smoothness of the pressing seat to press the positive current collecting disc.

[0344] Furthermore, an extrusion slope is formed on the end of the position-limiting clamping portion extending into the clamping cavity. Under the compressive action of the positive current collecting disk on the extrusion slope, the multiple position-limiting clamping portions can move away from each other until they clamp to the periphery of the positive current collecting disk, thereby forming a stable clamping force on the positive current collecting disk. It is worth mentioning that in this embodiment, the multiple position-limiting clamping portions have a tendency to move toward each other, thereby applying a continuous clamping force to the positive current collecting disk. For example, the multiple position-limiting clamping portions can be connected to the pressure holding seat via an elastic structure, and under the action of the elastic structure, the multiple position-limiting clamping portions can maintain a tendency to move toward each other.

[0345] In other embodiments, the guiding portion includes a plurality of guiding sections arranged in segments, and a clearance gap is formed between two adjacent guiding sections. The clearance gap is used for the passage of the limiting clamping portion. The guiding portion is formed by a plurality of guiding sections together, and a clearance gap can be formed between two adjacent guiding sections. The clearance gap provides clearance for the movement of the limiting clamping portion, and the size of the positive collecting disk clamping mechanism in the second direction can be reduced as much as possible, thereby reducing the probability of interference between the positive collecting disk clamping mechanism and the positive collecting disk feeding tooling 143, and improving the operation smoothness of the positive collecting disk welding unit 14.

[0346] It should be noted that the above-mentioned four technical features in parallel are "a rotation-stopping protrusion is also formed on the holding seat, and the rotation-stopping protrusion is arranged corresponding to the clamping cavity, which is used to cooperate with the matching recess on the positive collecting disk to limit the rotation of the positive collecting disk", "an extrusion slope is formed on the end of the limit clamping portion extending into the clamping cavity, and under the extrusion action of the positive collecting disk on the extrusion slope, the multiple limit clamping portions can move away from each other until they are clamped to the periphery of the positive collecting disk", "a guide slope is formed on the end face of the guide portion facing the placement portion, and the guide slope extends toward the clamping cavity" and "the guide portion includes a plurality of guide sections arranged in segments, and a clearance gap is formed between two adjacent guide sections, and the clearance gap is used for the limit clamping portion to pass through" can be set one by one, two by two, three by three, or even set at the same time. Obviously, setting them at the same time will have more effects.

[0347] To achieve the above-mentioned objectives, the positive collector plate welding production line proposed in the present application includes a positive collector plate welding unit 14 as in any of the above-mentioned embodiments, and a flattening unit 13, a post-flattening detection unit, a post-weld detection unit, a rubber coating unit 15, a rubber coating detection unit, a trimming unit 16, a trimming detection unit, and a defective blanking unit arranged in sequence along the transmission path of the first battery cell conveyor line 12 of the positive collector plate welding unit 14; wherein, multiple pressing tooling 141 of the positive collector plate welding unit 14 is arranged between the post-flattening detection unit and the post-weld detection unit.

[0348] It should be noted that the structure of the positive current collecting plate welding unit 14 in the positive current collecting plate welding production line can refer to the embodiment of the positive current collecting plate welding unit 14 mentioned above, and will not be repeated here; since the above-mentioned positive current collecting plate welding unit 14 is used in the positive current collecting plate welding production line provided in this application, the embodiment of the positive current collecting plate welding production line provided in this application includes all the technical solutions of all the embodiments of the above-mentioned positive current collecting plate welding unit 14, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0349] In the technical solution provided by the present application, the flattening unit 13 can flatten the ends of the battery cells, thereby improving the flatness of the end faces of the battery cells and facilitating the welding of the positive collector plate; the post-flattening detection unit can identify and detect the battery cells after flattening to identify unqualified battery cells, thereby sending the unqualified battery cells to the defective unloading unit for offline processing; the post-weld detection unit can identify and detect the battery cells after welding to identify unqualified battery cells with substandard welding quality, thereby sending the unqualified battery cells to the defective unloading unit for offline processing; the glue wrapping unit 15 can glue wrap the welding ends of the battery cells, and the edge trimming unit 16 can trim the glue wrapping of the welding ends, thereby playing the role of bonding the positive collector plate and the welding ends; the glue wrapping detection unit and the edge trimming detection unit respectively detect the glue wrapping quality and the edge trimming quality to identify unqualified battery cells with substandard glue wrapping quality and edge trimming quality, thereby sending the unqualified battery cells to the defective unloading unit for offline processing.

[0350] The step S200 includes:

[0351] The battery cell is put into the shell, and the battery cell with the positive collector plate welded is pushed into the shell through the shell assembly unit 23 until it reaches the bottom of the shell;

[0352] The magnetic levitation transport line transports the battery cells that have completed leveling and positive collector plate welding to the second production station. The second battery cell conveying line 22 can convey the battery cells that have completed leveling and positive collector plate welding to the shell assembly station. The shell conveying line 21 conveys the battery cell shell to the shell assembly station, so that the shell assembly unit 23 can push the battery cells that have completed leveling and positive collector plate welding into the shell until they reach the bottom of the shell.

[0353] Positive electrode penetration welding: the positive current collecting plate and the bottom of the shell are welded together by the positive electrode penetration welding unit 24;

[0354] The second battery cell conveying line 22 can convey the battery cells assembled with the shell to the positive electrode penetration welding station, so that the positive electrode penetration welding unit 24 can weld the positive current collecting plate and the bottom of the shell into one.

[0355] Collector plate side wall welding, the negative collector plate and the shell are welded into one by the collector plate side wall welding unit 25;

[0356] The second battery cell conveyor line 22 can convey the battery cells that have completed positive electrode penetration welding to the collecting plate side wall welding station, and the negative collecting plate loading mechanism 253 can also convey the negative collecting plate to the collecting plate side wall welding station to assemble the negative collecting plate to the battery cell, and weld the flange of the negative collecting plate to the inner wall of the shell through the negative electrode shell welding assembly 255.

[0357] Negative current collecting plate welding: The negative current collecting plate is welded to the negative electrode of the battery cell with the current collecting plate side wall welding completed by the negative current collecting plate welding unit 26 .

[0358] The second cell conveying line 22 can convey the cell with the collector plate side wall welded to the negative collector plate welding station, so that the negative collector plate welding unit 26 can weld the negative collector plate of the cell to the negative electrode of the cell.

[0359] It can be understood that the second production device 2 sequentially performs battery cell shell insertion, positive electrode penetration welding, current collector side wall welding and negative current collector welding on the battery cells, thereby improving the assembly efficiency, assembly accuracy and assembly success rate of the negative current collector, thereby ensuring the welding efficiency and welding quality of the negative current collector.

[0360] The step S300 includes:

[0361] Pre-spot welding of the cover plate: pre-spot welding of the negative electrode cover plate and the shell of the battery cell is performed through the pre-spot welding mechanism 33;

[0362] The magnetic levitation transport line transports the battery cells to the third production station, the third battery cell conveyor line 32 conveys the battery cells to the pre-spot welding station, the AGV automatic docking cache conveyor line conveys the cover of the battery cells on the cover loading station to the pre-spot welding station, and then the pre-spot welding mechanism 33 pre-spot welds the negative electrode cover and the shell of the battery cells.

[0363] Cover plate welding: the cover plate welding mechanism 34 welds the shell of the battery cell and the negative electrode cover plate, which have been pre-spot-welded, into one piece;

[0364] The third battery cell conveying line 32 can convey the battery cells after the cover plates are pre-spot-welded to the cover plate welding station, so that the cover plate welding mechanism 34 can weld the shell of the battery cells after the cover plates are pre-spot-welded and the negative electrode cover plate into one.

[0365] Weld seam cleaning: cleaning the weld seams of the battery cells where the cover plate welding is completed at the post-weld cleaning station by means of a cleaning mechanism 35;

[0366] The third battery cell conveying line 32 conveys the battery cells that have completed cover plate welding to the post-weld cleaning station, and the cleaning mechanism 35 can clean the welds of the battery cells that have completed cover plate welding.

[0367] Weld seam inspection: The inspection mechanism 36 is used to inspect the weld seams of the battery cells that have completed weld seam cleaning at the post-weld inspection station.

[0368] The third battery cell conveying line 32 conveys the battery cells to the post-weld inspection station, and the inspection mechanism 36 inspects the welds of the cleaned battery cells to determine whether the sealing quality of the battery cells meets the requirements.

[0369] In this embodiment, the third production device 3 performs cover pre-spot welding, cover welding, weld cleaning and weld detection on the battery cells in sequence, and the AGV is set to automatically dock the cache conveyor line and the third battery cell conveyor line 32 so as to convey the cover body and the shell respectively, and a cover welding mechanism 34 is set to seal the shell and the cover body at the cover welding station, and the cleaning mechanism 35 is set to clean the weld of the battery cell so as not to affect the detection of the detection mechanism 36. At the same time, the detection mechanism 36 is set to monitor the sealing quality of the battery cell so as to eliminate unqualified products, which is conducive to improving the yield rate of the cylindrical electrode cover welding device. The whole process does not require manual participation, which can not only reduce the intensity of manual labor, but also improve welding efficiency, thereby solving the problem of difficulty and low efficiency of existing cover welding.

[0370] The step S400 includes:

[0371] Battery cell cleaning: Use a laser cleaning device to clean the injection holes of the battery cells that have completed cover plate welding;

[0372] The magnetic levitation transport line transports the battery cells that have completed cover plate welding to the fourth production station, and the fourth battery cell transport line 41 then transports the battery cells that have completed cover plate welding to the cleaning station, so that the laser cleaning device performs laser cleaning on the injection holes of the battery cells that have completed cover plate welding, removes debris in the battery cell injection holes, and ensures the welding quality of subsequent sealing nails.

[0373] Sealing nail positioning: the specific positions of the sealing nail and the battery cell injection hole are determined by the first visual positioning mechanism 45 and the second visual positioning mechanism 46, and the sealing nail is installed in the battery cell injection hole by the nailing mechanism 44;

[0374] The fourth battery cell conveying line 41 conveys the battery cells to the sealing nail welding station. During the process of the nailing mechanism 44 installing the sealing nail into the battery cell injection hole, the first visual positioning mechanism 45 can collect the specific position of the sealing nail relative to the nailing mechanism 44, and the second visual positioning mechanism 46 can collect the specific position of the battery cell injection hole. The relative position of the sealing nail and the battery cell injection hole can be accurately determined through two specific positions to ensure the installation accuracy of the sealing nail.

[0375] Sealing pin welding: The sealing pin is welded to the liquid injection hole of the cleaned battery cell by a sealing pin welding mechanism 47 .

[0376] The fourth battery cell conveying line 41 can convey the cleaned battery cells to the sealing pin welding station, so that the sealing pin welding mechanism 47 can weld the sealing pins into the liquid injection holes of the cleaned battery cells.

[0377] It can be understood that the fourth production device 4 sequentially cleans the battery cells, positions the sealing nails, and welds the sealing nails, cleans the liquid injection holes of the battery cells by the laser cleaning device, and collects the first position and the second position respectively by the first visual positioning mechanism 45 and the second visual positioning mechanism 46 to determine the specific position of the sealing nail on the picking portion 441 and the specific position of the battery cell liquid injection hole, thereby realizing a dual positioning function, solving the problem of position deviation of the sealing nail during the nailing process, improving the positioning accuracy of the sealing nail, and the yield rate in subsequent welding work, and finally welding the sealing nail to the liquid injection hole of the battery cell by the sealing nail welding mechanism 47, and improving the welding efficiency.

[0378] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A cylindrical battery cell production line, wherein: The cylindrical battery cell production line is formed with a first production station, a second production station, a third production station and a fourth production station, and the cylindrical battery cell production line includes: At least one transport line passes through the first production station, the second production station, the third production station and the fourth production station in sequence, for transporting semi-finished products of the battery cells; A first production device, provided at the first production station, for leveling the battery cells and welding the positive collector plates; The second production device is provided at the second production station, and is used to sequentially perform positive electrode penetration welding, current collector side wall welding, and negative current collector welding after the battery cell is placed in the shell; A third production device is provided at the third production station and is used for welding the negative electrode cover and the shell of the battery cell; and The fourth production device is arranged at the fourth production station and is used for cleaning the battery cell injection hole and welding the sealing nail to the battery cell injection hole.

2. The cylindrical battery cell production line according to claim 1, wherein: The first production device is formed with a flattening station, a positive collector plate welding station, a rubberizing station and an edge finishing station, and the first production device includes: A positive current collecting plate feeding unit, used for conveying the positive current collecting plate to the positive current collecting plate welding station; The first battery cell conveyor line passes through the flattening station, the positive collector plate welding station, the encapsulation station and the edge finishing station in sequence; A flattening unit is provided at the flattening station and is used to perform a four-stage flattening process on the two poles of the battery cell at the flattening station; A positive collector disc welding unit is provided at the positive collector disc welding station, comprising a plurality of pressing toolings, a battery cell transfer tooling, a positive collector disc feeding tooling and a positive collector disc welding structure. The pressing tooling is used to place the battery cell and the positive collector disc so that the positive collector disc is pressed onto the end of the battery cell. The battery cell transfer tooling is switchable between the first battery cell conveyor line and the plurality of pressing toolings to transfer the battery cells before welding on the first battery cell conveyor line to each of the pressing toolings, and to transfer the battery cells welded on the pressing tooling back to the first battery cell conveyor line. The positive collector disc feeding tooling is used to provide positive collector discs to the plurality of pressing toolings. The positive collector disc welding structure is switchable between the plurality of pressing toolings to sequentially weld the positive collector discs pressed on each of the pressing toolings to the battery cells that have been flattened. A coating unit is provided at the coating station, and is used to coat the positive electrode and the positive current collecting disk of the battery cell at the coating station with coating; and The edge trimming unit is provided at the edge trimming station and is used for trimming the rubber coating of the positive electrode of the battery cell at the edge trimming station to the positive current collecting plate.

3. The cylindrical battery cell production line according to claim 1, wherein: The second production device is formed with a shell assembly station, a positive electrode penetration welding station, a current collecting plate side wall welding station and a negative current collecting plate welding station, and the second production device includes: Shell conveyor line, used to convey the shells of battery cells to the shell assembly station; A second cell conveying line sequentially passes through the shell assembly station, the positive electrode penetration welding station, the collector plate side wall welding station, and the negative collector plate welding station to convey the cells; A shell assembly unit is provided at the shell assembly station, and is used to push the battery cell, after flattening the battery cell and welding the positive collector plate, into the shell until the bottom of the shell; A positive electrode penetration welding unit is provided at the positive electrode penetration welding station and is used to weld the positive current collecting plate and the bottom of the shell into one body; The collecting plate side wall welding unit is arranged at the collecting plate side wall welding station, and includes a guide assembly, a battery cell feeding mechanism, a negative collecting plate feeding mechanism, a driving mechanism and a negative electrode shell welding assembly. The guide assembly includes two guide members arranged opposite to each other, and the two guide members are provided with notch grooves on the opposite sides. The two guide members are relatively movable so that when they approach each other to a preset position, the corresponding two notch grooves define a stepped hole. The inner wall of the stepped hole is formed with a step surface, and the stepped hole has a first hole section facing the step surface and a second hole section away from the step surface. The radial size of the first hole section is gradually reduced in the direction toward the second hole section, and the step surface is used to support the end of the shell. The inner wall of the second hole section is used to abut against the outer wall of the shell, and the first hole section is used to introduce the negative current collecting disc into the shell so that the flange of the negative current collecting disc abuts against the inner wall of the shell, and the battery cell feeding mechanism is movably arranged, including a bearing assembly and an end limit assembly, the bearing assembly is used to support the battery cell, and the end limit assembly is used to abut against one axial end of the battery cell, and the negative current collecting disc feeding mechanism is movably arranged, including a first negative current collecting disc picking portion for picking up the negative current collecting disc and assembling the negative current collecting disc to the shell, the driving mechanism drives the battery cell feeding mechanism and the negative current collecting disc feeding mechanism to move, and the negative electrode shell welding assembly is used to weld the assembled negative current collecting disc and the shell; and, The negative current collecting plate welding unit is provided at the negative current collecting plate welding station and is used for welding the negative current collecting plate at the negative current collecting plate welding station to the negative electrode of the battery cell.

4. The cylindrical battery cell production line according to claim 1, wherein: The third production device is formed with a cover plate loading station, a pre-spot welding station, a cover plate welding station, a post-weld cleaning station and a post-weld inspection station, and the third production device includes: The AGV automatically docks with the buffer conveyor line, which is set corresponding to the cover plate loading station to convey the cover plate to the pre-spot welding station; A third battery cell conveyor line sequentially passes through the cover plate loading station, the pre-spot welding station, the cover plate welding station, the post-weld cleaning station, and the post-weld inspection station to convey battery cells that have completed negative collector plate welding; A pre-spot welding mechanism is provided at the pre-spot welding station, and is used to pre-spot weld the cover plate and the shell at the pre-spot welding station; The cover plate welding mechanism includes a transfer structure, a cover plate positioning structure, and a cover plate welding structure. The transfer structure has a movable stroke between the cover plate feeding station and the cover plate welding station for transferring the battery cell to the cover plate welding station. The cover plate positioning structure is used to rotate and position the battery cell at the cover plate welding station. The cover plate welding structure is used to weld the battery cell shell and the negative electrode cover plate of the battery cell that has completed the cover plate pre-spot welding at the cover plate welding station into one body. a cleaning mechanism, provided at the post-weld cleaning station, for cleaning the battery cells at the post-weld cleaning station; and The detection mechanism is arranged at the post-weld detection station and is used to detect the welds of the battery cells at the post-weld detection station.

5. The cylindrical battery cell production line according to claim 1, wherein: The fourth production device is formed with a cleaning station, a nail supply station, a sealing nail welding station and a sealing nail welding station, and the fourth production device includes: a fourth battery cell conveying line, which sequentially passes through the cleaning station, the sealing nail welding station, and the sealing nail welding station, and is used to convey battery cells with completed cover plate welding; A cleaning assembly, comprising a laser cleaning device, the laser cleaning device being provided corresponding to the cleaning station to clean the injection holes of the battery cells at the cleaning station after the cover plate welding is completed; A battery cell carrier, used to carry the battery cells to the sealing nail welding station; The nail feeding mechanism has a picking portion for picking up the sealing nails from the sealing nail feeding station; A first visual positioning mechanism is located between the nailing mechanism and the sealing nail waiting welding station, and is used to collect the first position of the sealing nail relative to the picking part; A second visual positioning mechanism is located on one side of the sealing nail welding station along the third direction, and is used to collect the second position of the liquid injection hole on the battery cell; and A sealing pin welding mechanism, provided at the sealing pin welding station, for welding the sealing pin into the liquid injection hole of the battery cell; Wherein, the nailing mechanism is used to move the sealing nail from the first visual positioning mechanism to the sealing nail welding station according to the first position and the second position.

6. A production process for cylindrical battery cells, based on the cylindrical battery cell production line according to any one of claims 1 to 5, wherein: The production process of the cylindrical battery cell comprises the following steps: The battery cell is flattened by a first production device, and a positive collector is welded to the positive electrode of the battery cell; The second production device is used to place the battery cells that have been flattened and the positive collector plate welded into the shell, and then the positive electrode penetration welding, collector plate side wall welding and negative collector plate welding are carried out in sequence; The shell and negative electrode cover of the battery cell with the negative current collector welded are completed by welding with the third production device; The fourth production device is used to clean the liquid injection hole of the battery cell after the cover plate welding is completed, and the sealing nail is welded to the liquid injection hole of the battery cell.

7. The production process of a cylindrical battery cell according to claim 6, wherein: The step of flattening the battery cell by the first production device and welding the positive current collecting plate to the positive electrode of the battery cell includes: Incoming materials are put on line, the battery cells are put on line to the first battery cell conveyor line, and the positive current collecting tray is loaded onto the positive current collecting tray feeding unit; The battery cell is leveled, and the positive and negative poles of the battery cell are leveled in four stages through the leveling unit; Positive collector plate welding: welding the positive collector plate welding unit collector plate to the positive electrode of the battery cell after the battery cell is flattened by the positive collector plate welding unit; Positive electrode encapsulation: the positive electrode and the positive current collecting plate of the battery cell that has completed the positive current collecting plate welding are encapsulated with rubber by the encapsulation unit; Positive electrode edge trimming: The edge trimming unit trims the glue-coated positive electrode of the battery cell to the positive current collector after the glue-coating process is completed; The battery cells are unloaded from the winding conveyor line after edge trimming.

8. The production process of a cylindrical battery cell according to claim 6, wherein: The steps of sequentially performing positive electrode penetration welding, current collecting plate side wall welding, and negative current collecting plate welding after the battery cell is placed into the shell by the second production device include: The battery cell is put into the shell. The battery cell with the flattened battery cell and the positive collector plate welded is pushed into the shell until it reaches the bottom of the shell through the shell assembly unit; Positive electrode penetration welding: the positive current collecting plate and the bottom of the shell are welded together through the positive electrode penetration welding unit; Collector plate side wall welding, the negative collector plate and the shell are welded into one piece through the collector plate side wall welding unit; Negative current collecting plate welding: the negative current collecting plate is welded to the negative electrode of the battery cell with the current collecting plate side wall welding completed by the negative current collecting plate welding unit.

9. The production process of a cylindrical battery cell according to claim 6, wherein: The step of welding the negative electrode cover plate and the shell of the battery cell by the third production device includes: Cover plate pre-spot welding: pre-spot welding the negative electrode cover plate and shell of the battery cell through the pre-spot welding mechanism; Cover plate welding: the battery shell and the negative electrode cover plate are welded together by the cover plate welding mechanism; Weld seam cleaning: the cleaning mechanism is used to clean the weld seams of the battery cells where the cover plate welding is completed at the post-weld cleaning station; Weld seam inspection: The inspection mechanism is used to inspect the weld seams of the battery cells that have completed weld seam cleaning at the post-weld inspection station.

10. The production process of a cylindrical battery cell according to claim 6, wherein: The step of cleaning the battery cell injection hole and welding the sealing nail to the battery cell injection hole by the fourth production device includes: Battery cell cleaning: Use a laser cleaning device to clean the injection holes of the battery cells that have completed cover plate welding; Sealing pin positioning: the specific positions of the sealing pin and the battery cell injection hole are determined by the first and second visual positioning mechanisms, and the sealing pin is installed into the battery cell injection hole by the nailing mechanism; Sealing pin welding: The sealing pin is welded to the liquid injection hole of the cleaned battery cell through a sealing pin welding mechanism.

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