An automatic production line for power batteries

Abstract

The application relates to the technical field of battery processing, and discloses a power battery automatic production line which comprises a rubbing and flattening work station, a rubber coating work station, a current collector disc welding work station, a shell entering work station, a positive electrode welding work station and a negative electrode welding work station arranged along a conveying line; the rubbing and flattening work station is used for flattening two ends of an electric core; the rubber coating work station is used for winding adhesive tape around the two ends of the electric core; the current collector disc welding work station is used for welding a positive electrode current collector disc to the positive electrode end of the electric core and welding a negative electrode current collector disc to the negative electrode end of the electric core, and the negative electrode current collector disc is connected through a soft connection and a cover plate; the shell entering work station is used for pressing the electric core into a battery shell; the positive electrode welding work station is used for welding the positive electrode current collector disc and the bottom end of the battery shell into an integrated whole; and the negative electrode welding work station is used for closing and sealing the cover plate to weld the cover plate and the open end of the battery shell into an integrated whole. The application simplifies the battery processing procedure, reduces the battery processing cost, improves the battery processing efficiency, and is also beneficial to ensuring the sealing property of the battery product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery processing, and particularly relates to a power battery automatic production line. BACKGROUND

[0002] With the development of new energy technology, power batteries are widely applied to new energy vehicles such as electric bicycles and electric vehicles. Among them, lithium ion batteries are widely used in the field of power batteries due to their large energy density, superior cycle performance and wide working range.

[0003] At present, in the manufacturing process of the existing power battery, after the winding of the battery cell is sequentially subjected to rubbing, gluing and shell entering operations, the two ends of the battery cell are sequentially subjected to current collector disc welding, cover combining and sealing welding to obtain a battery product. Since the entire process needs to be subjected to twice cover combining and twice sealing welding operations, not only is the battery processing process complex, but also there are problems of high battery processing cost and great difficulty, and a complex battery processing production line needs to be configured, but it is difficult to ensure the sealing of the battery product. SUMMARY

[0004] The present application provides a power battery automatic production line to solve at least one of the above technical problems existing in the existing battery processing production line, so as to simplify the battery processing process, reduce the battery processing cost and ensure the sealing of the battery product.

[0005] The present application provides a power battery automatic production line, comprising: a conveying line, and a rubbing station, a gluing station, a current collector disc welding station, a shell entering station, a positive electrode welding station and a negative electrode welding station which are sequentially arranged along the conveying direction of the conveying line;

[0006] The conveying line is used for conveying the battery cell, the battery shell and the semi-finished battery containing the battery cell and the battery shell respectively, and the battery shell is provided with a single end opening;

[0007] The rubbing station is used for flattening the two ends of the battery cell, and the gluing station is used for winding adhesive tape on the two ends of the battery cell;

[0008] The current collector disc welding station is used for welding a positive electrode current collector disc on the positive electrode end of the battery cell and welding a negative electrode current collector disc on the negative electrode end of the battery cell, and the negative electrode current collector disc is connected through a soft connection and a cover plate;

[0009] The shell entering station is used for pressing the battery cell into the battery shell, the positive electrode welding station is used for welding the positive electrode current collector disc and the bottom end of the battery shell into one body, and the negative electrode welding station is used for combining the cover plate and sealing welding to weld the cover plate and the open end of the battery shell into one body.

[0010] The power battery automatic production line provided by the application comprises a kneading and flattening station, a first scanning code mechanism, a mechanical kneading and flattening mechanism, a dust removal mechanism, a first detection mechanism and a first defective product recycling mechanism which are sequentially arranged;

[0011] The first scanning code mechanism is used for identifying and registering the first identification code on the battery cell.

[0012] The mechanical kneading and flattening mechanism is used for performing a kneading and flattening operation on the positive and negative ends of the battery cell.

[0013] The dust removal mechanism is used for removing dust on the surface of the battery cell.

[0014] The first detection mechanism is used for detecting the length and short circuit of the battery cell.

[0015] The first defective product recycling mechanism is used for recycling the battery cell which fails to pass the detection according to the detection result of the first detection mechanism.

[0016] The power battery automatic production line provided by the application comprises a kneading and flattening station, a first scanning code mechanism, a mechanical kneading and flattening mechanism, a dust removal mechanism, a first detection mechanism and a first defective product recycling mechanism which are sequentially arranged;

[0017] The second scanning code mechanism is used for identifying and registering the first identification code on the battery cell.

[0018] The first encapsulating mechanism is used for performing an encapsulating operation on one end of the battery cell; the reversing mechanism is used for reversing the positions of the positive and negative ends of the battery cell on the conveying line; and the second encapsulating mechanism is used for performing an encapsulating operation on the other end of the battery cell.

[0019] The second detection mechanism is used for performing visual detection on the adhesive tape wound on the battery cell to determine whether the size of the adhesive tape exceeding the end of the battery cell is within a preset range.

[0020] The second defective product recycling mechanism is used for recycling the battery cell which fails to pass the detection according to the detection result of the second detection mechanism.

[0021] The power battery automatic production line provided by the application comprises a kneading and flattening station, a first scanning code mechanism, a mechanical kneading and flattening mechanism, a dust removal mechanism, a first detection mechanism and a first defective product recycling mechanism which are sequentially arranged;

[0022] The third scanning code mechanism, the first welding and pressing mechanism, the third detection mechanism and the third defective product recycling mechanism are sequentially arranged along the conveying direction of the conveying line.

[0023] The current collector plate loading production line and the first welding mechanism are arranged on one side of the conveying line, and the current collector plate loading production line comprises, in sequence, a current collector plate loading mechanism, a loading positioning mechanism, a temporary storage positioning mechanism, a material distribution mechanism and a turnover mechanism;

[0024] The third code scanning mechanism is used for identifying and registering the first identification code on the battery cell;

[0025] The current collector plate loading mechanism is used for transferring the current collector plate to the loading positioning mechanism, the loading positioning mechanism is used for positioning the received current collector plate for the first time, and the current collector plate comprises a positive current collector plate and a negative current collector plate; the material distribution mechanism is used for transferring the current collector plate stored in the loading positioning mechanism to the temporary storage positioning mechanism, and the temporary storage positioning mechanism is used for positioning the received current collector plate for the second time; the turnover mechanism is used for transferring the current collector plate stored in the temporary storage positioning mechanism to the first welding and pressing mechanism, and the first welding and pressing mechanism is used for pressing the current collector plate on the welding end of the battery cell;

[0026] The first welding mechanism is used for welding the current collector plate and the welding end of the battery cell into one body; the third detection mechanism is used for detecting the welding quality of the current collector plate; and the third defective product recycling mechanism is used for recycling the battery cell with unqualified welding quality according to the detection result of the third detection mechanism.

[0027] According to the automatic production line of the power battery, the positive current collector plate welding unit and the negative current collector plate welding unit are arranged in sequence along the conveying direction of the conveying line; and a direction adjusting mechanism is arranged between the positive current collector plate welding unit and the negative current collector plate welding unit, and the direction adjusting mechanism is used for adjusting the positions of the positive end and the negative end of the battery cell on the conveying line.

[0028] According to the automatic production line of the power battery, the conveying line corresponding to the shell entering station comprises a battery cell conveying line and a battery shell conveying line;

[0029] The shell entering station is provided with a fourth code scanning mechanism, a cover plate deviation rectifying mechanism, a shell code printing mechanism, a shell code scanning mechanism, a shell entering mechanism and a fourth defective product recycling mechanism;

[0030] The fourth code scanning mechanism, the cover plate deviation rectifying mechanism are sequentially arranged along the conveying direction of the battery cell conveying line; the shell code marking mechanism, the shell code scanning mechanism and the fourth defective product recycling mechanism are sequentially arranged along the conveying direction of the battery shell conveying line; the shell inserting mechanism is arranged between the battery cell conveying line and the battery shell conveying line, and is arranged at the rear side of the cover plate deviation rectifying mechanism along the conveying direction of the battery cell conveying line, and is arranged between the shell code scanning mechanism and the fourth defective product recycling mechanism along the conveying direction of the battery shell conveying line;

[0031] The fourth code scanning mechanism is used for identifying and registering the first identification code on the battery cell; and the cover plate deviation rectifying mechanism is used for rectifying the position of the cover plate, so that the cover plate is horizontally distributed.

[0032] The shell code marking mechanism is used for marking a second identification code on the surface of the battery shell; the shell code scanning mechanism is used for identifying and registering the second identification code; and the shell inserting mechanism is used for pressing the battery cell on the battery cell conveying line into the battery shell on the battery shell conveying line.

[0033] The fourth defective product recycling mechanism is used for recycling the battery shell with unqualified code scanning result according to the code scanning result of the shell code scanning mechanism.

[0034] According to the application, the positive electrode welding station is provided with a fifth code scanning mechanism, a second welding and pressing mechanism, a second welding mechanism and a fifth defective product recycling mechanism.

[0035] The fifth code scanning mechanism is used for identifying and registering a second identification code on the battery shell.

[0036] The second welding and pressing mechanism is used for abutting against the negative electrode end of the battery cell, so that the positive electrode current collector plate and the bottom end of the battery shell are attached.

[0037] The second welding mechanism is used for integrally welding the positive electrode current collector plate and the bottom end of the battery shell by means of penetration welding, so as to obtain a semi-finished product battery.

[0038] The fifth defective product recycling mechanism is used for recycling the semi-finished product battery with unqualified code scanning result according to the code scanning result of the fifth code scanning mechanism.

[0039] According to the application, the negative electrode welding station comprises a pre-spot welding unit and a sealing welding unit which are sequentially arranged.

[0040] The pre-spot welding unit is used for connecting the cover plate and the open end of the battery shell by spot welding; and the sealing welding unit is used for ring seam welding the joint between the cover plate and the open end of the battery shell.

[0041] According to the application, the pre-spot welding unit comprises a sixth code scanning mechanism, a tab bending mechanism, a cover closing mechanism, a pre-spot welding mechanism, a fourth detection mechanism and a sixth defective product recycling mechanism.

[0042] The sixth code scanning mechanism is used for identifying and registering the second identification code on the battery shell.

[0043] The tab bending mechanism is used for bending the soft connection between the negative current collector disc and the cover plate, so that the cover plate and the open end of the battery shell are arranged in axial direction.

[0044] The cover closing mechanism is used for closing the cover plate on the open end of the battery shell.

[0045] The pre-spot welding mechanism is used for pre-spot welding the joint between the cover plate and the open end of the battery shell.

[0046] The fourth detection mechanism is used for short circuit testing of the semi-finished battery after pre-spot welding; and the sixth defective product recycling mechanism is used for recycling the semi-finished battery that fails in the short circuit testing according to the detection result of the fourth detection mechanism.

[0047] According to the application, the sealing welding unit comprises a seventh code scanning mechanism, a sealing welding mechanism, a cover plate coding mechanism, a cover plate code scanning mechanism, a fifth detection mechanism and a seventh defective product recycling mechanism arranged in sequence.

[0048] The seventh code scanning mechanism is used for identifying and registering the second identification code on the battery shell.

[0049] The sealing welding mechanism is used for ring seam welding the joint between the cover plate and the battery shell.

[0050] The cover plate coding mechanism is used for marking the third identification code on the cover plate; and the cover plate code scanning mechanism is used for identifying and registering the third identification code.

[0051] The fifth detection mechanism is used for short circuit testing of the semi-finished battery after sealing welding; and the seventh defective product recycling mechanism is used for recycling the semi-finished battery that fails in the short circuit testing according to the detection result of the fifth detection mechanism.

[0052] The power battery automatic production line provided by the application further comprises a sealing nail welding station; the sealing nail welding station is arranged at the rear side of the negative electrode welding station along the conveying direction of the conveying line;

[0053] The sealing nail welding station comprises a visual correction mechanism, a rubber plug pulling mechanism, a helium filling mechanism, a nail placing mechanism, a third welding mechanism, an eighth code scanning mechanism, a sixth detection mechanism and an eighth defective product recycling mechanism arranged in sequence;

[0054] The visual correction mechanism is used for adjusting the placing posture of the semi-finished battery based on the visual recognition result of the liquid injection port on the cover plate;

[0055] The rubber plug pulling mechanism is used for pulling out the rubber plug inserted in the liquid injection port;

[0056] The helium filling mechanism is used for filling helium into the semi-finished battery through the liquid injection port;

[0057] The nail placing mechanism is used for placing a sealing nail in the liquid injection port; and the third welding mechanism is used for performing girth welding on the gap between the sealing nail and the liquid injection port;

[0058] The eighth code scanning mechanism is used for identifying and registering the second identification code on the battery shell and / or the third identification code on the cover plate;

[0059] The sixth detection mechanism is used for visually detecting the welding quality of the sealing nail;

[0060] The eighth defective product recycling mechanism is used for recycling the semi-finished battery with unqualified welding quality according to the detection result of the sixth detection mechanism.

[0061] The power battery automatic production line provided by the application improves the existing battery production process, and can sequentially perform flattening and rubber coating on the battery cell, weld the positive electrode current collector disc without a cover plate on the positive electrode end of the battery cell, weld the negative electrode current collector disc with a cover plate on the negative electrode end of the battery cell, weld the positive electrode current collector disc and the bottom end of the battery shell into one body after the battery cell is put into the shell, and finally weld the cover plate and the open end of the battery shell into one body by closing and welding the cover plate.

[0062] Compared with the existing battery production process, the application reduces one closing and one welding operation, simplifies the battery processing process, reduces the battery processing cost, improves the battery processing efficiency, and is also beneficial to ensuring the sealing property of the battery product. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to make the technical solutions in the present application or the prior art clearer, the accompanying drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0064] Figure 1 Fig. 1 is a flowchart of the automatic production line of power batteries provided by the present application;

[0065] Figure 2 Fig. 2 is a structural diagram of the kneading and flattening station provided by the present application;

[0066] Figure 3 Fig. 3 is a structural diagram of the encapsulation station provided by the present application;

[0067] Figure 4 Fig. 4 is a structural diagram of the positive current collector plate welding unit in the current collector plate welding station provided by the present application;

[0068] Figure 5 Fig. 5 is a structural diagram of the current collector plate feeding line and the first welding and pressing mechanism provided by the present application;

[0069] Figure 6 Fig. 6 is a structural diagram of the shell feeding station provided by the present application;

[0070] Figure 7 Fig. 7 is a structural diagram of the positive electrode welding station provided by the present application;

[0071] Figure 8 Fig. 8 is a structural diagram of the pre-spot welding unit in the negative electrode welding station provided by the present application;

[0072] Figure 9 Fig. 9 is a structural diagram of the sealing welding unit in the negative electrode welding station provided by the present application;

[0073] Figure 10 Fig. 10 is a structural diagram of the sealing pin welding station provided by the present application.

[0074] Reference signs:

[0075] 1, conveying line; 11, battery cell conveying line; 12, battery shell conveying line;

[0076] 2, kneading and flattening station; 21, polarity detection mechanism; 22, first code scanning mechanism; 23, mechanical kneading and flattening mechanism; 24, dust removal mechanism; 25, first detection mechanism; 26, first defective product recycling mechanism;

[0077] 3, encapsulation work station; 31, second code scanning mechanism; 32, first encapsulation mechanism; 33, reversing mechanism; 34, second encapsulation mechanism; 35, second detection mechanism; 36, second defective product recycling mechanism;

[0078] 4, current collector plate welding work station; 41, positive current collector plate welding unit; 42, negative current collector plate welding unit; 43, direction adjusting mechanism; 411, third code scanning mechanism; 412, current collector plate feeding production line; 413, first welding and pressing mechanism; 414, first welding mechanism; 415, third detection mechanism; 416, third defective product recycling mechanism; 4121, current collector plate feeding mechanism; 4122, feeding positioning mechanism; 4123, temporary storage positioning mechanism; 4124, material distribution mechanism; 4125, overturning mechanism;

[0079] 5, shell entering work station; 51, fourth code scanning mechanism; 52, cover plate deviation rectifying mechanism; 53, shell shaping mechanism; 54, shell code printing mechanism; 55, shell code scanning mechanism; 56, shell cleaning mechanism; 57, shell entering mechanism; 58, fourth defective product recycling mechanism;

[0080] 6, positive electrode welding work station; 61, fifth code scanning mechanism; 62, second welding and pressing mechanism; 63, second welding mechanism; 64, fifth defective product recycling mechanism;

[0081] 7, negative electrode welding work station; 71, pre-spot welding unit; 72, sealing welding unit; 711, sixth code scanning mechanism; 712, tab bending mechanism; 713, cover closing mechanism; 714, pre-spot welding mechanism; 715, fourth detection mechanism; 716, sixth defective product recycling mechanism; 721, seventh code scanning mechanism; 722, sealing welding mechanism; 723, cover code printing mechanism; 724, cover code scanning mechanism; 725, fifth detection mechanism; 726, seventh defective product recycling mechanism;

[0082] 8, sealing nail welding work station; 81, visual rotation mechanism; 82, rubber plug pulling mechanism; 83, helium filling mechanism; 84, laser cleaning mechanism; 85, nail feeding mechanism; 86, third welding mechanism; 87, eighth code scanning mechanism; 88, sixth detection mechanism; 89, eighth defective product recycling mechanism. DETAILED DESCRIPTION

[0083] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0084] The present application will be described below in combination withFigures 1-10 This invention describes an automated production line for power batteries.

[0085] like Figure 1 As shown, this embodiment provides an automated production line for power batteries, including: a conveyor line 1, and a flattening station 2, a rubber coating station 3, a collector plate welding station 4, a casing station 5, a positive electrode welding station 6, and a negative electrode welding station 7 arranged sequentially along the conveying direction of the conveyor line 1.

[0086] Understandably, conveyor line 1 can be a battery step conveyor line known in the art. According to the battery processing steps, conveyor line 1 is used to transport battery cells, battery casings, and semi-finished batteries containing battery cells and casings respectively, so that the battery processing components can flow sequentially along the aforementioned workstations without manual transfer. The battery processing components include battery cells, battery casings, and semi-finished batteries, with the battery casings being open at one end.

[0087] Furthermore, in this embodiment, a feeding robot can be set at the beginning of the conveyor line 1 to transfer the battery cells to the conveyor line 1, and the conveyor line 1 will then transport the battery cells to the flattening station 2.

[0088] At the leveling station 2, a mechanical leveling head and / or an ultrasonic leveling head can be used to level both ends of the battery cell so that the positive current collector can be welded to the positive end of the battery cell and the negative current collector can be welded to the negative end of the battery cell in the subsequent current collector welding station 4.

[0089] Next, at the coating station 3, tape is wrapped around the perimeter walls near both ends of the battery cell. This not only ensures that both ends of the battery cell remain flat, but also protects the battery cell and prevents the casing mold from scratching the surface of the battery cell when it is subsequently installed into the casing.

[0090] Next, after the battery cell is coated with adhesive, a positive current collector is welded to the positive terminal of the battery cell and a negative current collector is welded to the negative terminal at current collector welding station 4. In this embodiment, the order of welding the positive and negative current collectors is not restricted. The negative current collector is connected by a flexible connector and a cover plate, while the positive current collector does not have a flexible connector or a cover plate.

[0091] Next, after welding the current collectors at both ends of the battery cell, the battery cell can be pressed into the battery case at the casing insertion station 5, ensuring that the positive terminal of the battery cell faces the bottom of the battery case and the negative terminal of the battery cell faces the open end of the battery case.

[0092] Finally, at the positive electrode welding station 6, the positive electrode current collector and the bottom of the battery casing are welded together by penetration welding. At the negative electrode welding station 7, the cover plate is closed and sealed to weld the open end of the cover plate and the battery casing together.

[0093] As can be seen from the above, by improving the existing battery production process, the present invention can first perform flattening and coating treatment on the battery cell, then weld a positive current collector without a cover plate to the positive terminal of the battery cell, and weld a negative current collector with a cover plate to the negative terminal of the battery cell. After the battery cell is put into the casing, the positive current collector and the bottom end of the battery casing can be directly welded together. Finally, the cover plate is closed and sealed to weld the open end of the cover plate and the battery casing together.

[0094] Compared to existing battery manufacturing processes, the positive terminal of the power battery of this invention is directly welded to the battery casing through a positive current collector, reducing one capping and one sealing operation. Thus, this invention simplifies the battery processing process, reduces battery processing costs, improves battery processing efficiency, and also helps ensure the sealing of battery products.

[0095] Meanwhile, compared to batteries prepared by existing battery manufacturing processes, the battery products prepared by this invention have a shorter current flow path, faster charging and discharging, and generate less heat during operation.

[0096] In some embodiments, such as Figure 1 and Figure 2 As shown, the kneading station 2 in this embodiment includes a first scanning mechanism 22, a mechanical kneading mechanism 23, a dust removal mechanism 24, a first detection mechanism 25, and a first defective product recycling mechanism 26 arranged sequentially. To prevent the positive and negative terminals of the incoming battery cells from being reversed, a polarity detection mechanism 21 is provided in front of the first scanning mechanism 22.

[0097] In this embodiment, two conveyor lines 1 can be provided. Each of the two conveyor lines 1 is sequentially provided with a polarity detection mechanism 21, a first scanning mechanism 22, a mechanical flattening mechanism 23, a dust removal mechanism 24, a first detection mechanism 25, and a first defective product recycling mechanism 26.

[0098] Specifically, in this embodiment, the flattening process of the battery cell can be described as follows, according to the arrangement of the various mechanisms in the flattening station 2.

[0099] (1) In this embodiment, a color sensor can be set in the polarity detection mechanism 21 to identify the positive and negative terminals of the battery cell, so as to prevent the polarity of the battery cell transported on the transport line 1 from being reversed.

[0100] (2) The first scanning mechanism 22 is equipped with a barcode scanner. The barcode scanner identifies and registers the first identification code on the battery cell by rotating the barcode scanner. In this embodiment, a rotary drive can be provided on the conveyor line 1 to drive the battery cell to rotate on the conveyor line 1 so that the barcode scanner can perform rotary scanning.

[0101] (3) The mechanical flattening mechanism 23 is provided with a mechanical flattening head. The mechanical flattening mechanism 23 can determine the polarity of the end of the battery cell to be flattened according to the detection result of the polarity detection mechanism 21, so as to obtain the flattening parameters of the positive and negative ends of the battery cell, thereby the positive and negative ends of the battery cell can be subjected to targeted flattening operation according to the flattening parameters.

[0102] In the process of mechanically flattening the end of the battery cell, dust suction operation can also be performed on the flattened part to prevent the debris generated by flattening from adhering to the mechanical flattening head, thereby affecting the flattening effect.

[0103] At the same time, in order to improve the flattening efficiency, a plurality of mechanical flattening mechanisms 23 can be arranged along the conveying direction of the conveying line 1.

[0104] (4) The dust removal mechanism 24 can be provided with a blowing assembly and a dust suction assembly. The dust suction assembly can be used for dust suction operation while the blowing assembly is used for blowing the flattened battery cell, so as to remove the dust on the surface of the battery cell and ensure the cleanliness of the battery cell.

[0105] (5) The first detection mechanism 25 can be provided with a length detection assembly and a short circuit detection assembly. The length detection assembly detects the length of the battery cell after flattening. Since the diaphragm between the positive and negative plates of the battery cell may be damaged during flattening, the positive or negative material falling off during flattening may cause short circuit of the battery cell. Therefore, the short circuit detection assembly of the present embodiment can pass current through both ends of the flattened battery cell, and can judge whether the battery cell is short-circuited by collecting the current, so as to realize short circuit detection of the battery cell.

[0106] (6) The first defective product recycling mechanism 26 is used for recycling the battery cell which fails to pass the detection of the first detection mechanism 25. The first defective product recycling mechanism 26 can be provided with a line transfer assembly and a recycling box, and the line transfer assembly is used for transferring the defective battery cell on the conveying line 1 to the recycling box.

[0107] In some embodiments, as shown in Figure 1 and Figure 3 The encapsulation work station 3 includes a second code scanning mechanism 31, a first encapsulation mechanism 32, a reversing mechanism 33, a second encapsulation mechanism 34, a second detection mechanism 35 and a second defective product recycling mechanism 36 arranged in sequence. The encapsulation work station 3 is arranged at the rear side of the flattening work station 2 along the conveying direction of the conveying line 1, and the encapsulation work station 3 is also provided with two conveying lines 1, and the two conveying lines 1 are sequentially provided with the second code scanning mechanism 31, the first encapsulation mechanism 32, the reversing mechanism 33, the second encapsulation mechanism 34, the second detection mechanism 35 and the second defective product recycling mechanism 36.

[0108] Specifically, the encapsulation process of the battery cell can be described as follows according to the arrangement order of the mechanisms in the encapsulation work station 3.

[0109] (1) The second code scanning mechanism 31 can recognize and register the first identification code on the battery cell by rotating to scan the code. The second code scanning mechanism 31 is similar in structure to the first code scanning mechanism 22, and will not be described in detail here.

[0110] (2) The first encapsulation mechanism 32 is used to wrap the transparent tape around the circumferential wall near one end of the battery cell to realize encapsulation of the one end of the battery cell; the reversing mechanism 33 is used to reverse the orientation of the positive and negative ends of the battery cell on the conveying line 1; and the second encapsulation mechanism 34 is used to wrap the transparent tape around the circumferential wall near the other end of the battery cell to realize encapsulation of the other end of the battery cell.

[0111] To improve the encapsulation efficiency of the battery cell, the first encapsulation mechanism 32 and the second encapsulation mechanism 34 can each be provided in multiple.

[0112] (3) The second detection mechanism 35 is used to visually detect the tape wrapped around the battery cell to determine whether the size of the tape exceeding the end of the battery cell is within a preset range.

[0113] In this way, if the size of the tape exceeding the end of the battery cell is greater than the preset value, the part of the tape exceeding the end of the battery cell will affect the subsequent current collector plate welding operation, so that the encapsulation of the battery cell can be determined to be unqualified.

[0114] When visually detecting the battery cell, the image of the battery cell can be acquired first, the image of the part of the tape exceeding the end of the battery cell can be obtained by image segmentation according to the difference between pixels, and the length of the part of the tape can be identified.

[0115] (4) The second defective product recycling mechanism 36 is used to recycle the battery cell that fails the detection according to the detection result of the second detection mechanism 35.

[0116] In some embodiments, as shown in Figs. Figure 1 and Figure 4 The current collector plate welding station 4 includes a positive current collector plate welding unit 41 and a negative current collector plate welding unit 42.

[0117] In actual applications, the positive current collector plate welding unit 41 and the negative current collector plate welding unit 42 can be sequentially arranged along the conveying direction of the conveying line 1, and a direction reversing mechanism 43 can be arranged between the positive current collector plate welding unit 41 and the negative current collector plate welding unit 42, so as to reverse the orientation of the positive and negative ends of the battery cell on the conveying line 1 by the direction reversing mechanism 43, thereby ensuring the continuity of the current collector plate welding process.

[0118] Since the positive electrode current collector plate welding unit 41 and the negative electrode current collector plate welding unit 42 have the same structure, the present application takes the positive electrode current collector plate welding unit 41 as an example to describe the structure of the current collector plate welding workstation 4. The positive electrode current collector plate welding unit 41 can weld the positive electrode current collector plate without a soft connection and a cover plate to the positive electrode end of the battery cell, and the negative electrode current collector plate welding unit 42 can weld the negative electrode current collector plate with a soft connection and a cover plate to the negative electrode end of the battery cell.

[0119] Specifically, the positive electrode current collector plate welding unit 41 includes a third code scanning mechanism 411, a current collector plate feeding line 412, a first welding and pressing mechanism 413, a first welding mechanism 414, a third detection mechanism 415, and a third defective product recycling mechanism 416.

[0120] As shown in Figure 4 , the third code scanning mechanism 411, the first welding and pressing mechanism 413, the third detection mechanism 415, and the third defective product recycling mechanism 416 are sequentially arranged along the conveying direction of the conveying line 1.

[0121] As shown in Figure 4 and Figure 5 , the current collector plate feeding line 412 and the first welding mechanism 414 are arranged on one side of the conveying line 1. The current collector plate feeding line 412 includes a current collector plate feeding mechanism 4121, a feeding positioning mechanism 4122, a temporary storage positioning mechanism 4123, a distribution mechanism 4124, and a turnover mechanism 4125 arranged sequentially.

[0122] In actual application, the conveying work of the battery cell by the conveying line 1 and the feeding work of the current collector plate by the current collector plate feeding line 412 are performed synchronously.

[0123] On the conveying line 1, the third code scanning mechanism 411 is used to identify and record the first identification code on the battery cell. After the third code scanning mechanism 411 completes the code scanning of the battery cell, the battery cell can reach the first welding and pressing mechanism 413 under the conveying of the conveying line 1 to wait for the feeding and welding of the current collector plate.

[0124] At the same time, in the current collector plate feeding line 412, the current collector plate feeding mechanism 4121 moves the current collector plate stored on the current collector plate feeding machine to the feeding positioning mechanism 4122 by negative pressure adsorption. The feeding positioning mechanism 4122 is used to position the received current collector plate for the first time.

[0125] The distribution mechanism 4124 is used to transfer the current collector plate stored in the feeding positioning mechanism 4122 to the temporary storage positioning mechanism 4123 by negative pressure adsorption. The temporary storage positioning mechanism 4123 is used to position the received current collector plate for the second time.

[0126] The turnover mechanism 4125 is used to transfer the current collector plate stored by the temporary material positioning mechanism 4123 to the first welding and pressing mechanism 413, which is used to press the current collector plate on the to-be-welded end of the battery cell, so that the first welding mechanism 414 welds the current collector plate and the to-be-welded end of the battery cell into one.

[0127] It should be pointed out here that, in order to ensure the welding effect of the current collector plate, the present embodiment can distribute the current collector plate to the temporary material positioning mechanism 4123 arranged in a plurality of welding stations by the material distribution mechanism 4124, the plurality of welding stations are arranged in sequence along the conveying direction of the conveying line 1, each welding station is provided with a first welding and pressing mechanism 413, the first welding and pressing mechanism 413 and the turnover mechanism 4125 are arranged one by one, and the turnover mechanism 4125 and the temporary material positioning mechanism 4123 are arranged one by one.

[0128] Further, the third detection mechanism 415 of the present embodiment is provided with a short circuit detection assembly and a visual detection assembly, which can detect the short circuit of the battery cell after the welding of the current collector plate, and detect the welding quality of the current collector plate. In this way, the third defective product recycling mechanism 416 can recycle the battery cell with unqualified welding quality according to the detection result of the third detection mechanism 415.

[0129] In some embodiments, as shown in Figure 1 and Figure 6 The conveying line 1 corresponding to the shell entering work station 5 includes a battery cell conveying line 11 and a battery shell conveying line 12.

[0130] The shell entering work station 5 is provided with a fourth code scanning mechanism 51, a cover plate deviation rectifying mechanism 52, a shell coding mechanism 54, a shell code scanning mechanism 55, a shell entering mechanism 57 and a fourth defective product recycling mechanism 58.

[0131] On the battery cell conveying line 11, the fourth code scanning mechanism 51 and the cover plate deviation rectifying mechanism 52 are sequentially arranged along the conveying direction of the battery cell conveying line 11.

[0132] On the battery shell conveying line 12, the shell coding mechanism 54, the shell code scanning mechanism 55, the shell cleaning mechanism 56 and the fourth defective product recycling mechanism 58 are sequentially arranged along the conveying direction of the battery shell conveying line 12.

[0133] Among them, the shell entering mechanism 57 is arranged between the battery cell conveying line 11 and the battery shell conveying line 12 along the conveying direction of the battery cell conveying line 11, the shell entering mechanism 57 is arranged at the rear side of the cover plate deviation rectifying mechanism 52, and the shell entering mechanism 57 is located between the shell code scanning mechanism 55 and the fourth defective product recycling mechanism 58 along the conveying direction of the battery shell conveying line 12.

[0134] In order to prevent the battery shell from being deformed, affecting the shell entering effect, the shell shaping mechanism 53 is arranged on the battery shell conveying line 12, and the shell shaping mechanism 53 is used for roundness shaping of the open end of the battery shell. The shell shaping mechanism 53 is arranged before the shell code marking mechanism 54.

[0135] At the same time, in order to prevent dust from adhering to the battery shell and affecting the battery shell entering effect, the shell cleaning mechanism 56 is arranged on the battery shell conveying line 12, and the shell cleaning mechanism 56 is arranged between the shell code scanning mechanism 55 and the shell entering mechanism 57.

[0136] Specifically, the conveying operation of the battery shell on the battery shell conveying line 12 is synchronized with the conveying operation of the battery shell on the battery shell conveying line 12. On the battery shell conveying line 12, the fourth code scanning mechanism 51 identifies and records the first identification code on the battery shell in a rotating code scanning manner, and then when the battery shell is conveyed to the position corresponding to the cover plate correcting mechanism 52, the cover plate correcting mechanism 52 drives the battery shell to rotate on the battery shell conveying line 11, adjusts the posture of the cover plate on the negative electrode end of the battery shell, and corrects the position of the cover plate, so that the cover plate is horizontally distributed, and the battery shell entering mechanism 57 is used for the battery shell entering operation, so as to prevent the placement position of the cover plate from affecting the battery shell entering operation.

[0137] On the battery shell conveying line 12, the battery shell can be moved to the battery shell conveying line 12 by the shell loading mechanism, and when the battery shell is conveyed to the position corresponding to the shell shaping mechanism 53, the shell shaping mechanism 53 is used for roundness shaping of the open end of the battery shell; then, the shell code marking mechanism 54 marks the second identification code on the surface of the battery shell; then, the shell code scanning mechanism 55 identifies and records the second identification code on the battery shell; then, the shell cleaning mechanism 56 can clean the battery shell by blowing and negative pressure suction. After the cleaned battery shell is conveyed to the position corresponding to the shell entering mechanism 57, the shell entering mechanism 57 applies a driving force to the negative electrode end of the battery shell to press the battery shell on the battery shell conveying line 12 into the battery shell on the battery shell conveying line 12, until the positive electrode end of the battery shell and the bottom of the battery shell are attached. Finally, the semi-finished battery composed of the battery shell and the battery shell continues to be conveyed on the battery shell conveying line 12.

[0138] Among them, on the battery shell conveying line 12, if the code scanning is not good in the code scanning of the battery shell, the fourth defective product recycling mechanism 58 can recycle the battery shell with unqualified code scanning according to the code scanning result of the shell code scanning mechanism 55.

[0139] In some embodiments, as shown in Figure 1 and Figure 7 The positive electrode welding station 6 is provided with a fifth code scanning mechanism 61, a second welding and pressing mechanism 62, a second welding mechanism 63 and a fifth defective product recycling mechanism 64.

[0140] Similarly, the positive electrode welding station 6 is also provided with two conveying lines 1, and each of the two conveying lines 1 is sequentially provided with a fifth code scanning mechanism 61, a second welding and pressing mechanism 62, a second welding mechanism 63, and a fifth defective product recycling mechanism 64.

[0141] Specifically, the present embodiment can be described as follows according to the arrangement order of each mechanism in the positive electrode welding station 6 for the welding process of the positive electrode current collector and the bottom end of the battery shell.

[0142] (1) The fifth code scanning mechanism 61 can recognize and record the second identification code on the battery shell through rotating code scanning. The fifth code scanning mechanism 61 is similar in structure to the first code scanning mechanism 22, and will not be described in detail here.

[0143] (2) The second welding and pressing mechanism 62 is used to abut against the negative electrode end of the battery cell, so that the positive electrode current collector and the bottom end of the battery shell are in good contact. The second welding and pressing mechanism 62 can be provided with a pressing assembly and a rotating driving assembly. One end of the pressing assembly can abut against the negative electrode end of the battery cell, and the other end can abut against the bottom end of the battery shell, so as to ensure that the positive electrode current collector and the bottom end of the battery shell are in good contact during welding. The rotating driving assembly is used to drive the battery cell to rotate, so as to weld the positive electrode current collector.

[0144] (3) The second welding mechanism 63 is used to weld the positive electrode current collector and the bottom end of the battery shell into one body through penetration welding, so as to obtain a semi-finished battery. In the case where the second welding and pressing mechanism 62 ensures that the positive electrode current collector and the bottom end of the battery shell are in good contact, laser penetration welding can be performed on the bottom end of the battery shell, so that the positive electrode current collector and the bottom end of the battery shell are welded into one body.

[0145] (4) The fifth defective product recycling mechanism 64 is used to recycle the semi-finished battery that fails to pass the code scanning according to the code scanning result of the fifth code scanning mechanism 61.

[0146] In some embodiments, as shown in FIG. 7, the negative electrode welding station 7 includes a pre-spot welding unit 71 and a sealing welding unit 72 arranged in sequence. Figure 1

[0147] Thus, when the cover plate is welded in the negative electrode welding station 7, the cover plate can be connected to the open end of the battery shell through the pre-spot welding unit 71 in a spot welding manner, and then the joint between the cover plate and the open end of the battery shell can be ring seam welded through the sealing welding unit 72.

[0148] In some embodiments, as shown in FIG. 7, the negative electrode welding station 7 includes a pre-spot welding unit 71 and a sealing welding unit 72 arranged in sequence. Figure 1 Figure 8 ​​As shown, the pre-point welding unit 71 comprises a sixth code scanning mechanism 711, a tab bending mechanism 712, a cover closing mechanism 713, a pre-point welding mechanism 714, a fourth detection mechanism 715, and a sixth defective product recycling mechanism 716.

[0149] Similarly, the pre-point welding unit 71 is also provided with two conveying lines 1, and each of the two conveying lines 1 is sequentially provided with the sixth code scanning mechanism 711, the tab bending mechanism 712, the cover closing mechanism 713, the pre-point welding mechanism 714, the fourth detection mechanism 715, and the sixth defective product recycling mechanism 716.

[0150] Specifically, the pre-point welding process of the cover plate can be described as follows according to the arrangement order of the mechanisms in the pre-point welding unit 71.

[0151] (1) The sixth code scanning mechanism 711 can identify and register the second identification code on the battery shell by rotating the code scanning.

[0152] (2) The tab bending mechanism 712 is used to bend the soft connection between the negative current collector and the cover plate, so that the cover plate and the open end of the battery shell are arranged in opposite directions along the axial direction. During the tab bending process, the cell can be adjusted to be centered, and the soft connection between the negative current collector and the cover plate can be bent multiple times to reduce the difficulty of the bending operation. After the tab bending is completed, the cover plate can also be adjusted to be centered and compressed to ensure that the cover plate and the open end of the battery shell are arranged in opposite directions along the axial direction of the cell, so as to facilitate the subsequent cover closing operation of the battery.

[0153] (3) The cover closing mechanism 713 is used to close the cover plate on the open end of the battery shell. The cover closing mechanism 713 is provided with a rotary driving member, which is provided with a bearing head and a pushing head arranged coaxially. The bearing head bears on the bottom end of the battery shell, and the pushing head is used to cooperate with the cover plate and drive the cover plate to move towards the open end of the battery shell until the cover plate is closed on the open end of the battery shell.

[0154] When the pre-point welding mechanism 714 performs the pre-point welding operation on the joint between the cover plate and the open end of the battery shell, the rotary driving member can drive the semi-finished battery held between the bearing head and the pushing head to rotate, and the laser head of the pre-point welding mechanism 714 only needs to pass through the avoidance opening on the pushing head to perform laser spot welding on the joint between the cover plate and the open end of the battery shell, which is simple and convenient.

[0155] (4) The fourth detection mechanism 715 is used to perform a short circuit test on the semi-finished battery after pre-point welding; and the sixth defective product recycling mechanism 716 is used to recycle the semi-finished battery that fails the short circuit test according to the detection result of the fourth detection mechanism 715.

[0156] It should be pointed out here that in order to improve the pre-point welding effect on the cover plate, the pre-point welding mechanism 714 and the cover closing mechanism 713 can be provided with multiple sets on each conveying line 1 in the embodiment.

[0157] In some embodiments, as shown in Figure 1 and Figure 9 The sealing welding unit 72 comprises a seventh code scanning mechanism 721, a sealing welding mechanism 722, a cover plate code marking mechanism 723, a cover plate code scanning mechanism 724, a fifth detection mechanism 725 and a seventh defective product recycling mechanism 726 arranged in sequence.

[0158] Similarly, the sealing welding unit 72 is also provided with two conveying lines 1, and the two conveying lines 1 are sequentially provided with the seventh code scanning mechanism 721, the sealing welding mechanism 722, the cover plate code marking mechanism 723, the cover plate code scanning mechanism 724, the fifth detection mechanism 725 and the seventh defective product recycling mechanism 726.

[0159] Specifically, the sealing welding process of the cover plate can be described as follows according to the arrangement order of each mechanism in the sealing welding unit 72.

[0160] (1) The seventh code scanning mechanism 721 identifies and registers the second identification code on the battery shell by rotating code scanning.

[0161] (2) The sealing welding mechanism 722 is used for circular seam welding of the joint between the cover plate and the battery shell.

[0162] (3) The cover plate code marking mechanism 723 is used for marking the third identification code on the cover plate, and the cover plate code scanning mechanism 724 is used for identifying and registering the third identification code.

[0163] (4) The fifth detection mechanism 725 is used for short circuit test of the semi-finished battery after sealing welding; and the seventh defective product recycling mechanism 726 is used for recycling the semi-finished battery that fails in the short circuit test according to the detection result of the fifth detection mechanism 725.

[0164] It should be pointed out here that in order to improve the sealing welding effect on the cover plate, the sealing welding mechanism 722 can be provided with multiple sets on each conveying line 1 in the embodiment, and each sealing welding mechanism 722 can perform laser circular seam welding on the joint between the cover plate and the battery shell.

[0165] In some embodiments, as shown in Figure 1 and Figure 10 The power battery automatic production line is also provided with a sealing nail welding station 8; the sealing nail welding station 8 is arranged at the rear side of the negative electrode welding station 7 along the conveying direction of the conveying line 1.

[0166] The sealing nail welding station 8 comprises, in sequence, a visual alignment mechanism 81, a rubber plug pulling mechanism 82, a helium filling mechanism 83, a laser cleaning mechanism 84, a nail feeding mechanism 85, a third welding mechanism 86, an eighth code scanning mechanism 87, a sixth detection mechanism 88, and an eighth defective product recycling mechanism 89.

[0167] In this embodiment, the sealing nail welding station 8 can be provided with a ring-shaped conveying line, the first end and the second end of the ring-shaped conveying line are arranged on the same side of the conveying line 1, the visual alignment mechanism 81, the rubber plug pulling mechanism 82, the helium filling mechanism 83, the laser cleaning mechanism 84, the nail feeding mechanism 85, the third welding mechanism 86, the eighth code scanning mechanism 87, the sixth detection mechanism 88, and the eighth defective product recycling mechanism 89 are sequentially arranged between the first end and the second end of the ring-shaped conveying line, a feeding mechanism is arranged at the first end of the ring-shaped conveying line, and a discharging mechanism is arranged at the second end of the ring-shaped conveying line.

[0168] In actual work, the semi-finished battery conveyed on the conveying line 1 can be transferred to the battery carrier of the ring-shaped conveying line through the feeding mechanism, and each semi-finished battery is arranged in rotation on the battery carrier.

[0169] Under the conveying of the ring-shaped conveying line, the battery carrier carrying the semi-finished battery reaches the station where the visual alignment mechanism 81 is arranged, the visual alignment mechanism 81 is used to adjust the placement posture of the semi-finished battery based on the visual recognition result of the liquid injection port on the cover plate, so that the driving head (for example, the driving head is a clamping head or a vacuum suction head) of the rubber plug pulling mechanism 82 can reach the position where the liquid injection port is located, so as to pull out the rubber plug inserted in the liquid injection port. It should be pointed out that the semi-finished battery in this embodiment is filled with electrolyte.

[0170] Then, when the semi-finished battery reaches the station where the helium filling mechanism 83 is arranged, the helium filling mechanism 83 can be controlled to fill helium into the semi-finished battery through the liquid injection port. It should be pointed out that after the helium filling of the semi-finished battery is completed, the liquid injection port is in an open state, and a small amount of helium leakage does not affect the subsequent helium detection operation of the battery due to the short sealing nail welding time.

[0171] Then, when the semi-finished battery reaches the cleaning station, the laser cleaning mechanism 84 is used to clean the liquid injection port by laser, so as to ensure the cleanliness of the liquid injection port and prevent the liquid injection port from affecting the subsequent sealing nail welding quality due to impurities.

[0172] Then, in the nail feeding mechanism 85, the sealing nail can be placed in the liquid injection port by the negative pressure suction head, so that after the sealing nail is inserted into the liquid injection port, the third welding mechanism 86 can be used to perform ring seam welding on the gap between the sealing nail and the liquid injection port, so as to realize the welding of the sealing nail.

[0173] Then, the eighth code scanning mechanism 87 identifies and registers the second identification code on the battery shell and / or the third identification code on the cover plate;

[0174] Finally, the sixth detection mechanism 88 is used for visually detecting the welding quality of the sealing nail, and the eighth defective product recycling mechanism 89 is used for recycling the semi-finished battery with unqualified welding quality according to the detection result of the sixth detection mechanism 88.

[0175] It should be pointed out here that in order to improve the welding efficiency of the sealing nail, the nail feeding mechanism 85 and the third welding mechanism 86 of the embodiment are relatively provided with multiple ones, and the nail feeding mechanism 85 and the third welding mechanism 86 are alternately arranged along the conveying direction of the annular conveying line.

[0176] At the same time, the sixth detection mechanism 88 of the embodiment is not limited to visually detecting the welding quality of the sealing nail, but can also detect the short circuit of the battery after the welding of the sealing nail. When the battery has no quality problem through the sixth detection mechanism 88, it can be transferred from the annular conveying line to the conveying line 1 shown in the embodiment by the discharging mechanism, so as to perform the subsequent battery warehousing operation.

[0177] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A power battery automatic production line, characterized in that, The application relates to a battery production line. The battery production line comprises a conveying line and a rubbing and flattening station, a rubberizing station, a current collector plate welding station, a shell inserting station, a positive electrode welding station and a negative electrode welding station arranged along the conveying direction of the conveying line in sequence. The conveying line is used for conveying a battery cell, a battery shell and a semi-finished battery comprising the battery cell and the battery shell respectively, and the battery shell is provided with a single-end opening. The rubbing and flattening station is used for flattening two ends of the battery cell, and the rubberizing station is used for winding adhesive tape around the two ends of the battery cell. The current collector plate welding station is used for welding a positive current collector plate to the positive electrode end of the battery cell and welding a negative current collector plate to the negative electrode end of the battery cell, and the negative current collector plate is connected through a soft connection and a cover plate. The shell inserting station is used for pressing the battery cell into the battery shell, the positive electrode welding station is used for welding the positive current collector plate and the bottom end of the battery shell into one, and the negative electrode welding station is used for covering and sealing the cover plate to weld the cover plate and the open end of the battery shell into one.

2. The automatic production line of power batteries according to claim 1, characterized in that, The rubbing and flattening station comprises a first code scanning mechanism, a mechanical rubbing and flattening mechanism, a dust removing mechanism, a first detection mechanism and a first defective product recycling mechanism arranged in sequence. The first code scanning mechanism is used for identifying and registering a first identification code on the battery cell. The mechanical rubbing and flattening mechanism is used for rubbing and flattening the positive electrode end and the negative electrode end of the battery cell. The dust removing mechanism is used for removing dust on the surface of the battery cell. The first detection mechanism is used for detecting the length and short circuit of the battery cell. The first defective product recycling mechanism is used for recycling the battery cell which fails to pass the detection according to the detection result of the first detection mechanism.

3. The automatic production line of power batteries according to claim 1, characterized in that, The rubberizing station comprises a second code scanning mechanism, a first rubberizing mechanism, a reversing mechanism, a second rubberizing mechanism, a second detection mechanism and a second defective product recycling mechanism arranged in sequence. The second code scanning mechanism is used for identifying and registering the first identification code on the battery cell. The first rubberizing mechanism is used for rubberizing one end of the battery cell, the reversing mechanism is used for reversing the positions of the positive electrode end and the negative electrode end of the battery cell on the conveying line, and the second rubberizing mechanism is used for rubberizing the other end of the battery cell. The second detection mechanism is used for visually detecting the adhesive tape wound on the battery cell to determine whether the size of the adhesive tape exceeding the end of the battery cell is within a preset range. The second defective product recycling mechanism is used for recycling the battery cell which fails to pass the detection according to the detection result of the second detection mechanism.

4. The automatic production line of power batteries according to claim 1, characterized in that, The current collector plate welding station comprises a positive current collector plate welding unit and a negative current collector plate welding unit, and the positive current collector plate welding unit and the negative current collector plate welding unit each comprises a third code scanning mechanism, a current collector plate feeding line, a first welding and pressing mechanism, a first welding mechanism, a third detection mechanism and a third defective product recycling mechanism. The third code scanning mechanism, the first welding and pressing mechanism, the third detection mechanism and the third defective product recycling mechanism are arranged in sequence along the conveying direction of the conveying line. The current collecting plate feeding production line and the first welding mechanism are arranged on one side of the conveying line, and the current collecting plate feeding production line comprises, in sequence, a current collecting plate feeding mechanism, a feeding positioning mechanism, a temporary storage positioning mechanism, a material distributing mechanism and a turnover mechanism; The third code scanning mechanism is used for identifying and registering the first identification code on the battery cell; The current collecting plate feeding mechanism is used for transferring the current collecting plate to the feeding positioning mechanism, the feeding positioning mechanism is used for positioning the received current collecting plate for the first time, and the current collecting plate comprises a positive current collecting plate and a negative current collecting plate; the material distributing mechanism is used for transferring the current collecting plate stored in the feeding positioning mechanism to the temporary storage positioning mechanism, the temporary storage positioning mechanism is used for positioning the received current collecting plate for the second time; and the turnover mechanism is used for transferring the current collecting plate stored in the temporary storage positioning mechanism to the first welding and pressing mechanism, and the first welding and pressing mechanism is used for pressing the current collecting plate on the welding end of the battery cell; The first welding mechanism is used for welding the current collecting plate and the welding end of the battery cell into one body; the third detection mechanism is used for detecting the welding quality of the current collecting plate; and the third defective product recycling mechanism is used for recycling the battery cell with unqualified welding quality according to the detection result of the third detection mechanism.

5. The automatic production line of power batteries according to claim 1, characterized in that, The conveying line corresponding to the shell entering station comprises a battery cell conveying line and a battery shell conveying line; The shell entering station is provided with a fourth code scanning mechanism, a cover plate deviation rectifying mechanism, a shell coding mechanism, a shell code scanning mechanism, a shell entering mechanism and a fourth defective product recycling mechanism; The fourth code scanning mechanism and the cover plate deviation rectifying mechanism are sequentially arranged along the conveying direction of the battery cell conveying line; the shell coding mechanism, the shell code scanning mechanism and the fourth defective product recycling mechanism are sequentially arranged along the conveying direction of the battery shell conveying line; the shell entering mechanism is arranged between the battery cell conveying line and the battery shell conveying line, and is arranged at the rear side of the cover plate deviation rectifying mechanism along the conveying direction of the battery cell conveying line and is located between the shell code scanning mechanism and the fourth defective product recycling mechanism along the conveying direction of the battery shell conveying line; The fourth code scanning mechanism is used for identifying and registering the first identification code on the battery cell; and the cover plate deviation rectifying mechanism is used for rectifying the position of the cover plate to make the cover plate horizontally distributed. The shell coding mechanism is used for marking a second identification code on the surface of the battery shell; the shell code scanning mechanism is used for identifying and registering the second identification code; and the shell entering mechanism is used for pressing the battery cell on the battery cell conveying line into the battery shell on the battery shell conveying line. The fourth defective product recycling mechanism is used for recycling the battery shell with unqualified code scanning result according to the code scanning result of the shell code scanning mechanism.

6. The automatic production line of power batteries according to claim 1, characterized in that, The positive electrode welding station is provided with a fifth code scanning mechanism, a second welding and pressing mechanism, a second welding mechanism and a fifth defective product recycling mechanism; The fifth code scanning mechanism is used for identifying and registering the second identification code on the battery shell; The second welding pressing mechanism is used for abutting against the negative electrode end of the battery cell, so that the positive electrode collector plate and the bottom end of the battery shell are attached; The second welding mechanism is used for welding the positive electrode collector plate and the bottom end of the battery shell into one body by means of penetration welding, so as to obtain a semi-finished battery; The fifth defective product recycling mechanism is used for recycling the semi-finished battery which fails to pass the code scanning according to the code scanning result of the fifth code scanning mechanism.

7. The automatic production line of power batteries according to claim 1, characterized in that, The negative electrode welding station comprises a pre-spot welding unit and a sealing welding unit arranged in sequence; The pre-spot welding unit is used for connecting the cover plate and the open end of the battery shell by means of spot welding; and the sealing welding unit is used for performing ring seam welding on the joint between the cover plate and the open end of the battery shell.

8. The automatic production line of power batteries according to claim 7, characterized in that, The pre-spot welding unit comprises a sixth code scanning mechanism, a tab bending mechanism, a cover closing mechanism, a pre-spot welding mechanism, a fourth detection mechanism and a sixth defective product recycling mechanism; The sixth code scanning mechanism is used for identifying and registering the second identification code on the battery shell; The tab bending mechanism is used for bending the soft connection between the negative electrode collector plate and the cover plate, so that the cover plate and the open end of the battery shell are arranged in axial relative arrangement; The cover closing mechanism is used for closing the cover plate on the open end of the battery shell; The pre-spot welding mechanism is used for pre-spot welding the joint between the cover plate and the open end of the battery shell; The fourth detection mechanism is used for performing short circuit test on the semi-finished battery obtained after pre-spot welding; The sixth defective product recycling mechanism is used for recycling the semi-finished battery which fails to pass the short circuit test according to the detection result of the fourth detection mechanism.

9. The automatic production line of power batteries according to claim 7, characterized in that, The sealing welding unit comprises a seventh code scanning mechanism, a sealing welding mechanism, a cover plate coding mechanism, a cover plate code scanning mechanism, a fifth detection mechanism and a seventh defective product recycling mechanism arranged in sequence; The seventh code scanning mechanism is used for identifying and registering the second identification code on the battery shell; The sealing welding mechanism is used for performing ring seam welding on the joint between the cover plate and the battery shell; The cover plate coding mechanism is used for marking a third identification code on the cover plate, and the cover plate code scanning mechanism is used for identifying and registering the third identification code; The fifth detection mechanism is used for performing short circuit test on the semi-finished battery obtained after sealing welding; and the seventh defective product recycling mechanism is used for recycling the semi-finished battery which fails to pass the short circuit test according to the detection result of the fifth detection mechanism.

10. The automatic production line of power batteries according to claim 9, characterized in that, Further comprising a sealing pin welding station; the sealing pin welding station is arranged at the rear side of the negative electrode welding station along the conveying direction of the conveying line; The sealing pin welding station comprises a visual righting mechanism, a rubber plug pulling mechanism, a helium filling mechanism, an upper pin mechanism, a third welding mechanism, an eighth code scanning mechanism, a sixth detection mechanism and an eighth defective product recycling mechanism arranged in sequence; The visual righting mechanism is used for adjusting the placement posture of the semi-finished battery based on the visual identification result of the liquid injection port on the cover plate; The rubber plug pulling mechanism is used for pulling out the rubber plug inserted in the liquid injection port; The helium filling mechanism is used for filling helium into the semi-finished battery through the liquid injection port; The third welding mechanism is used for welding the sealing pin on the cover plate; The upper nailing mechanism is used for placing a sealing nail on the liquid injection port; The third welding mechanism is used for circular seam welding on the gap between the sealing nail and the liquid injection port; The eighth code scanning mechanism is used for identifying and registering a second identification code on the battery shell and / or a third identification code on the cover plate; The sixth detection mechanism is used for visually detecting the welding quality of the sealing nail; The seventh defective product recycling mechanism is used for recycling the semi-finished battery with unqualified welding quality according to the detection result of the sixth detection mechanism.

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