CN115528292A

CN115528292A - Automatic production line for power batteries

Info

Publication number: CN115528292A
Application number: CN202211124884.2A
Authority: CN
Inventors: 冉昌林; 蔡汉钢; 林俊; 付小冬; 李鹏
Original assignee: Wuhan Yifi Laser Intelligent Equipment Co ltd; Wuhan Yifi Laser Corp Ltd
Current assignee: Wuhan Yifi Laser Intelligent Equipment Co ltd; Wuhan Yifi Laser Corp Ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2022-12-27

Abstract

The invention relates to the technical field of battery processing, and discloses an automatic power battery production line which comprises a kneading and flattening station, a rubber coating station, a current collecting disc welding station, a shell entering station, an anode welding station and a cathode welding station which are arranged along a conveying line; the kneading and flattening station is used for flattening the two ends of the battery cell; the rubber coating station is used for winding rubber belts on two ends of the battery cell; the current collecting disc welding station is used for welding a positive current collecting disc on the positive end of the battery cell, welding a negative current collecting disc on the negative end of the battery cell, and connecting the negative current collecting disc with the cover plate through flexible connection; the shell entering work station is used for pressing the battery core into the battery shell; the positive electrode welding station is used for welding the positive electrode current collecting disc and the bottom end of the battery shell into a whole; the negative electrode welding station is used for closing and sealing the cover plate so as to weld the cover plate and the open end of the battery case into a whole. The invention simplifies the battery processing procedure, reduces the battery processing cost, improves the battery processing efficiency and is beneficial to ensuring the sealing property of the battery product.

Description

Automatic production line for power batteries

Technical Field

The invention relates to the technical field of battery processing, in particular to an automatic production line for power batteries.

Background

With the development of new energy technology, the power battery is widely applied to new energy vehicles such as electric bicycles, electric automobiles and the like. Among them, the lithium ion battery is widely used in the field of power batteries with a large energy density, excellent cycle performance, and a wide working range.

At present, in the manufacturing process of the existing power battery, after the well-wound battery core is sequentially rubbed, encapsulated and shelled, current collecting plate welding, cover closing and seal welding are sequentially performed on two ends of the battery core, so as to obtain a battery product. Because the whole process needs two times of cover closing and two times of sealing and welding operations, the battery processing process is complex, the problems of high battery processing cost and high difficulty exist, a complex battery processing production line needs to be configured, and the sealing performance of a battery product is difficult to ensure.

Disclosure of Invention

The invention provides an automatic power battery production line, which is used for solving at least one technical problem existing in the existing battery processing production line, so as to simplify the battery processing procedure, reduce the battery processing cost and ensure the sealing property of a battery product.

The invention provides an automatic production line of power batteries, which comprises: the device comprises a conveying line, and a kneading and flattening station, a rubber coating station, a current collecting disc welding station, a shell entering station, an anode welding station and a cathode welding station which are sequentially arranged along the conveying direction of the conveying line;

the conveying line is used for conveying the battery core, the battery shell and the semi-finished product battery comprising the battery core and the battery shell respectively, and the battery shell is arranged with a single end open;

the kneading and leveling station is used for leveling two ends of the battery cell; the encapsulation work station is used for winding adhesive tapes on two ends of the battery cell;

the current collecting disc welding work station is used for welding a positive current collecting disc on the positive end of the battery cell and welding a negative current collecting disc on the negative end of the battery cell, and the negative current collecting disc is connected with the cover plate through flexible connection;

the battery cell 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 collecting disc and the bottom end of the battery shell into a whole; and the negative electrode welding station is used for closing and sealing the cover plate so as to weld the cover plate and the open end of the battery case into a whole.

According to the automatic power battery production line provided by the invention, the flattening station comprises a first code scanning mechanism, a mechanical flattening mechanism, a dust removing mechanism, a first detection mechanism and a first defective product recycling mechanism which are sequentially arranged;

the first code scanning mechanism is used for identifying and registering a first identification code on the battery cell;

the mechanical flattening mechanism is used for flattening the positive end and the negative end of the battery cell;

the dust removal mechanism is used for removing dust on the surface of the battery cell;

the first detection mechanism is used for detecting the length and the short circuit of the battery cell;

and the first defective product recovery mechanism is used for recovering the electric core which is detected to be unqualified according to the detection result of the first detection mechanism.

According to the automatic production line of the power battery, the rubber coating work station comprises a second code scanning mechanism, a first rubber coating mechanism, a reversing mechanism, a second rubber coating mechanism, a second detection mechanism and a second defective product recycling mechanism which are sequentially arranged;

the second code scanning mechanism is used for identifying and registering the first identification code on the battery cell;

the first rubber coating mechanism is used for performing rubber coating operation on one end of the battery cell; the reversing mechanism is used for changing the positions of the positive end and the negative end of the battery cell on the conveying line; the second rubber coating mechanism is used for performing rubber coating operation on the other end of the battery cell;

the second detection mechanism is used for performing visual detection on the adhesive tape wound on the battery cell so as to judge whether the size of the adhesive tape beyond the end part of the battery cell is within a preset range;

and the second defective product recovery mechanism is used for recovering the battery core which is detected to be unqualified according to the detection result of the second detection mechanism.

According to the automatic power battery production line provided by the invention, the collector plate welding station comprises an anode collector plate welding unit and a cathode collector plate welding unit, wherein the anode collector plate welding unit and the cathode collector plate welding unit respectively comprise a third code sweeping mechanism, a collector plate feeding production line, a first welding 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 sequentially arranged along the conveying direction of the conveying line;

the collecting tray feeding production line and the first welding mechanism are arranged on one side of the conveying line, and the collecting tray feeding production line comprises a collecting tray feeding mechanism, a feeding positioning mechanism, a temporary storage positioning mechanism, a distributing mechanism and a turnover mechanism which are sequentially arranged;

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

the collecting tray feeding mechanism is used for transferring the collecting tray to the feeding positioning mechanism, the feeding positioning mechanism is used for carrying out primary positioning on the received collecting tray, and the collecting tray comprises a positive collecting tray and a negative collecting tray; the distribution mechanism is used for transferring the collecting tray stored by the feeding positioning mechanism to the temporary storage positioning mechanism, and the temporary storage positioning mechanism is used for carrying out secondary positioning on the received collecting tray; the turnover mechanism is used for transferring the current collecting disc stored by 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 disc on the end to be welded of the battery cell;

the first welding mechanism is used for welding the current collecting disc and the end to be welded of the battery cell into a whole; the third detection mechanism is used for detecting the welding quality of the current collecting disc; 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.

According to the automatic power battery production line provided by the invention, the anode current collecting plate welding unit and the cathode current collecting plate welding unit are sequentially arranged along the conveying direction of the conveying line; and a direction adjusting mechanism is arranged between the positive current collecting plate welding unit and the negative current collecting plate welding unit and used for changing the positions of the positive end and the negative end of the battery cell on the conveying line.

According to the automatic power battery production line provided by the invention, the conveying lines corresponding to the case entering work station comprise a battery cell conveying line and a battery case conveying line;

the shell entering work 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 code printing 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, arranged on the rear side of the cover plate deviation rectifying mechanism along the conveying direction of the battery cell conveying line and 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; the cover plate deviation rectifying mechanism is used for rectifying the position of the cover plate so as to ensure that the cover plate is 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; the shell entering mechanism is used for pressing the battery core on the battery core conveying line into the battery shell on the battery shell conveying line;

and the fourth defective product recovery mechanism is used for recovering the battery shell with unqualified code according to the code scanning result of the code scanning mechanism of the shell.

According to the automatic production line of the power battery, provided by the invention, the positive electrode welding station is provided with a fifth code scanning mechanism, a second welding pressing mechanism, a second welding mechanism and a fifth defective product recycling mechanism;

the fifth code scanning mechanism is used for identifying and registering a second identification code on the battery shell;

the second welding pressing mechanism is used for abutting against the negative end of the battery core so that the positive current collecting plate is attached to the bottom end of the battery shell;

the second welding mechanism is used for welding the positive current collecting disc and the bottom end of the battery shell into a whole in a penetration welding mode to obtain a semi-finished battery;

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

According to the automatic production line of the power battery, the cathode welding station comprises a pre-spot welding unit and a sealing welding unit which are sequentially arranged;

the pre-spot welding unit is used for connecting the cover plate with the open end of the battery case in a spot welding mode; the seal welding unit is used for carrying out girth welding on a joint between the cover plate and the open end of the battery shell.

According to the automatic power battery production line provided by the invention, 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 recovery mechanism;

the sixth code scanning mechanism is used for identifying and registering a second identification code on the battery shell;

the tab bending mechanism is used for bending the flexible connection between the anode current collecting disc and the cover plate, so that the cover plate and the open end of the battery case are arranged oppositely along the axial direction;

the cover closing mechanism is used for closing the cover plate to the open end of the battery case;

the pre-spot welding mechanism is used for performing pre-spot welding operation on a joint between the cover plate and the open end of the battery case;

the fourth detection mechanism is used for carrying out short circuit test on the semi-finished product battery obtained after the pre-spot welding; and the sixth defective product recovery mechanism is used for recovering the semi-finished product battery unqualified in the short circuit test according to the detection result of the fourth detection mechanism.

According to the automatic production line of the power battery, the seal welding unit comprises a seventh code scanning mechanism, a seal welding mechanism, a cover plate code printing mechanism, a cover plate code scanning mechanism, a fifth detection mechanism and a seventh defective product recycling mechanism which are sequentially arranged;

the seventh code scanning mechanism is used for identifying and registering a second identification code on the battery shell;

the sealing welding mechanism is used for carrying out girth welding on a seam between the cover plate and the battery shell;

the cover plate code printing 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 carrying out short circuit test on the semi-finished product battery subjected to seal welding; and the seventh defective product recycling mechanism is used for recycling the semi-finished product battery unqualified in the short circuit test according to the detection result of the fifth detection mechanism.

The automatic production line for the power battery further comprises a sealing nail welding station; the sealing nail welding work station is arranged on the rear side of the cathode welding work station along the conveying direction of the conveying line;

the sealing nail welding work station comprises a vision correcting mechanism, a rubber plug pulling mechanism, a helium gas filling mechanism, a nail feeding mechanism, a third welding mechanism, an eighth code scanning mechanism, a sixth detection mechanism and an eighth defective product recycling mechanism which are sequentially arranged;

the vision correcting mechanism is used for adjusting the placing posture of the semi-finished product battery based on the result of vision recognition of the liquid injection port on the cover plate;

the rubber plug pulling mechanism is used for pulling out the rubber plug inserted on the liquid injection port;

the helium filling mechanism is used for filling helium into the semi-finished product battery through the liquid filling port;

the nail feeding mechanism is used for placing a sealing nail at the liquid injection port; the third welding mechanism is used for carrying out girth welding on a gap between the sealing nail and the liquid injection port;

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;

the sixth detection mechanism is used for carrying out visual detection on the welding quality of the sealing nail;

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

According to the automatic production line of the power battery, the existing battery production process is improved, the kneading and the encapsulation treatment can be sequentially carried out on the battery core, the positive pole current collecting disc without the cover plate is welded at the positive pole end of the battery core, the negative pole current collecting disc with the cover plate is welded at the negative pole end of the battery core, the positive pole current collecting disc and the bottom end of the battery shell can be directly welded into a whole after the battery core is placed into the shell, and finally the cover plate is closed and sealed to weld the cover plate and the open end of the battery shell into a whole.

Compared with the existing battery production procedures, the invention reduces the operations of one-time cover closing and one-time sealing welding, simplifies the battery processing procedures, reduces the battery processing cost, improves the battery processing efficiency and is beneficial to ensuring the sealing performance of the battery product.

Drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic flow diagram of an automatic power battery production line provided by the present invention;

FIG. 2 is a schematic structural view of a levelling station provided by the present invention;

FIG. 3 is a schematic structural view of a taping station provided by the present invention;

FIG. 4 is a schematic structural diagram of a positive current collecting plate welding unit in a current collecting plate welding station provided by the invention;

FIG. 5 is a schematic structural view of a collecting tray feeding line and a first welding and pressing mechanism provided by the present invention;

FIG. 6 is a schematic structural view of a case entering station provided by the present invention;

FIG. 7 is a schematic structural view of a positive welding station provided by the present invention;

FIG. 8 is a schematic structural diagram of a pre-spot welding unit in the cathode welding station provided by the present invention;

FIG. 9 is a schematic structural diagram of a seal welding unit in the cathode welding station provided by the present invention;

fig. 10 is a schematic structural view of a seal nail welding station provided by the invention.

Reference numerals:

1. a conveying line; 11. a battery cell conveying line; 12. a battery case conveying line;

2. a kneading and flattening station; 21. a polarity detection mechanism; 22. a first code scanning mechanism; 23. a mechanical kneading and flattening mechanism; 24. a dust removal mechanism; 25. a first detection mechanism; 26. a first defective product recovery mechanism;

3. a rubber coating station; 31. a second code scanning mechanism; 32. a first glue wrapping mechanism; 33. a reversing mechanism; 34. a second glue wrapping mechanism; 35. a second detection mechanism; 36. a second defective product recovery mechanism;

4. a collector plate welding station; 41. a positive collector plate welding unit; 42. a negative current collecting plate welding unit; 43. a direction adjusting mechanism; 411. a third code scanning mechanism; 412. a collecting tray feeding production line; 413. a first welding hold-down mechanism; 414. a first welding mechanism; 415. a third detection mechanism; 416. a third defective product recovery mechanism; 4121. a collecting tray feeding mechanism; 4122. a feeding positioning mechanism; 4123. a temporary storage positioning mechanism; 4124. a material distributing mechanism; 4125. a turnover mechanism;

5. entering a shell station; 51. a fourth code scanning mechanism; 52. a cover plate deviation rectifying mechanism; 53. a shell reshaping mechanism; 54. a shell coding mechanism; 55. a shell code scanning mechanism; 56. a housing cleaning mechanism; 57. a shell entering mechanism; 58. a fourth defective product recovery mechanism;

6. a positive electrode welding station; 61. a fifth code scanning mechanism; 62. a second welding hold-down mechanism; 63. a second welding mechanism; 64. a fifth defective product recovery mechanism;

7. a negative electrode welding station; 71. a pre-spot welding unit; 72. a seal welding unit; 711. a sixth code scanning mechanism; 712. a tab bending mechanism; 713. a cover closing mechanism; 714. a pre-spot welding mechanism; 715. a fourth detection mechanism; 716. a sixth defective product recovery mechanism; 721. a seventh code scanning mechanism; 722. a seal welding mechanism; 723. a cover plate coding mechanism; 724. a cover plate code scanning mechanism; 725. a fifth detection mechanism; 726. a seventh defective product recovery mechanism;

8. a sealing nail welding station; 81. a vision correcting mechanism; 82. a rubber plug pulling mechanism; 83. a helium gas filling mechanism; 84. a laser cleaning mechanism; 85. a nail feeding mechanism; 86. a third welding mechanism; 87. an eighth code scanning mechanism; 88. a sixth detection mechanism; 89. eighth defective product collecting means.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

An automatic power battery production line according to the present invention will be described with reference to fig. 1 to 10.

As shown in fig. 1, the present embodiment provides an automatic power battery production line, including: the device comprises a conveying line 1, and a kneading and flattening station 2, a rubber coating station 3, a current collecting disc welding station 4, a shell entering station 5, an anode welding station 6 and a cathode welding station 7 which are sequentially arranged along the conveying direction of the conveying line 1.

It will be appreciated that the delivery line 1 may be a battery walking line as is known in the art. According to the manufacturing procedure of battery, transfer chain 1 is used for carrying electric core, battery case and the semi-manufactured goods battery who contains electric core and battery case respectively to make battery processing part can flow in order along above-mentioned each worker station, need not artifical the transportation. The battery processing component comprises a battery core, a battery shell and a semi-finished battery, wherein the battery shell is arranged with a single end open.

Further, this embodiment can set up material loading robot at the head end of transfer chain 1, moves to transfer chain 1 with electric core through material loading robot, carries electric core to kneading and leveling worker station 2 by transfer chain 1.

In the flattening station 2, mechanical flattening and/or ultrasonic flattening can be adopted to flatten the two ends of the battery cell, so that the positive pole current collecting plate is welded to the positive pole end of the battery cell in the subsequent current collecting plate welding station 4, and the negative pole current collecting plate is welded to the negative pole end of the battery cell.

Then, at the encapsulation station 3, the adhesive tape is wound around the peripheral walls close to the two ends of the battery cell, so that the two ends of the battery cell can be ensured to be in a leveling state, the battery cell can be protected, and the surface of the battery cell is prevented from being scratched by a shell entering mold when the subsequent battery cell is placed into the shell.

Then, after the battery core is encapsulated, a positive current collecting plate is welded to the positive end of the battery core and a negative current collecting plate is welded to the negative end of the battery core in the current collecting plate welding station 4. The welding sequence of the positive current collecting disc and the negative current collecting disc is not limited in the embodiment, the negative current collecting disc is connected with the cover plate through flexible connection, and the positive current collecting disc is not provided with the flexible connection and the cover plate.

Then, accomplish the welding back of current collector to the both ends of electric core, can press the electric core into the battery case at income shell worker station 5, ensure the bottom of the positive pole end orientation battery case of electric core, and the negative pole end of electric core is towards the open end of battery case.

And finally, welding the positive current collecting disc and the bottom end of the battery case into a whole in a penetrating welding mode at a positive electrode welding station 6, and closing and sealing the cover plate at a negative electrode welding station 7 so as to weld the cover plate and the open end of the battery case into a whole.

According to the invention, the existing battery production process is improved, the battery core can be kneaded, leveled and encapsulated sequentially, the positive end of the battery core is welded with the positive current collecting disc without the cover plate, the negative end of the battery core is welded with the negative current collecting disc with the cover plate, the positive current collecting disc and the bottom end of the battery shell can be directly welded into a whole after the battery core is placed into the shell, and finally the cover plate is closed and sealed to weld the cover plate and the open end of the battery shell into a whole.

Compared with the existing battery production process, the positive electrode end of the power battery is directly welded with the battery shell into a whole through the positive electrode current collecting disc, and one-time cover closing and one-time sealing and welding operations are reduced, so that the battery production process can be simplified, the battery processing cost is reduced, the battery processing efficiency is improved, and the sealing performance of a battery product is ensured.

Meanwhile, compared with the battery prepared in the existing battery production process, the battery product prepared by the invention has the advantages of shorter current circulation path, faster charge and discharge, and less heat generated in the work process.

In some embodiments, as shown in fig. 1 and 2, the flattening station 2 of the present embodiment includes a first scan mechanism 22, a mechanical flattening mechanism 23, a dust removing mechanism 24, a first detection mechanism 25, and a first defective product recovery mechanism 26, which are arranged in sequence. In order to reverse the two ends of the positive electrode and the negative electrode of the battery core, a polarity detection mechanism 21 is arranged in front of the first code scanning mechanism 22.

Two conveying lines 1 of this embodiment may be provided, and each of the two conveying 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 recovery mechanism 26.

Specifically, the present embodiment can perform the cell flattening processing as follows according to the arrangement order of the mechanisms in the flattening station 2.

(1) In this embodiment, a color sensor may be disposed in the polarity detection mechanism 21, and the positive terminal and the negative terminal of the battery cell are identified by the color sensor, so as to prevent the polarity of the battery cell conveyed on the conveyor line 1 from being reversed.

(2) The first code scanning mechanism 22 is provided with a code scanner, which identifies the first identification code on the battery cell by rotating the code scanner and registers the first identification code. Wherein, this embodiment can set up rotary driving piece on transfer chain 1, rotates on transfer chain 1 through rotary driving piece drive battery core to the sign indicating number is swept in the rotation of bar code scanner.

(3) The mechanical flattening mechanism 23 is provided with a mechanical flattening head, and the mechanical flattening mechanism 23 can determine the polarity of the end part of the battery cell to be flattened according to the detection result of the polarity detection mechanism 21 so as to obtain flattening parameters of the positive end and the negative end of the battery cell, so that the positive end and the negative end of the battery cell can be flattened according to the flattening parameters.

In the process of mechanically kneading and flattening the end part of the battery cell, dust can be sucked at the kneading and flattening part to prevent scraps generated by kneading and flattening from being attached to the mechanical kneading and flattening head to influence the kneading and flattening effect.

Meanwhile, in order to improve the kneading efficiency, the present embodiment may provide a plurality of mechanical kneading mechanisms 23 along the conveying direction of the conveyor line 1.

(4) Dust removal mechanism 24 can set up and sweep subassembly and dust absorption subassembly, and when sweeping the subassembly and sweeping electric core after rubbing the tie, the accessible dust absorption subassembly carries out the dust absorption operation to get rid of the dust on electric core surface, ensure the cleanness of electric core.

(5) The first detection mechanism 25 may be provided with a length detection member and a short detection member. The length detection assembly detects the length of the battery cell after the battery cell is flattened. Because at the in-process of rubbing flat, the diaphragm between the positive plate and the negative pole piece of electric core probably takes place to damage, rubs flat positive pole or the negative pole material that drops and probably leads to electric core short circuit to the short circuit detection subassembly of this embodiment is through rubbing the both ends circular telegram of flat back electric core, and the accessible is gathered the circular telegram electric current and is judged whether electric core takes place the short circuit, with the short circuit detection to the realization to electric core.

(6) The first defective product recovery mechanism 26 is configured to recover the electric core that is detected to be unqualified according to the detection result of the first detection mechanism 25. Wherein, first defective products recovery mechanism 26 can set up commentaries on classics line subassembly and collection box, and the commentaries on classics line subassembly is used for shifting the unqualified electric core on transfer chain 1 to the collection box.

In some embodiments, as shown in fig. 1 and 3, the encapsulating station 3 includes a second code scanning mechanism 31, a first encapsulating mechanism 32, a reversing mechanism 33, a second encapsulating mechanism 34, a second detecting mechanism 35, and a second defective product recovering mechanism 36, which are sequentially arranged. Wherein, along the direction of delivery of transfer chain 1, rubber coating worker station 3 sets up in the rear side of rubbing flat worker station 2, and rubber coating worker station 3 also is provided with two transfer chains 1, and two transfer chains 1 all are provided with the second in order and sweep yard mechanism 31, first package gluey mechanism 32, reversing mechanism 33, second package gluey mechanism 34, second detection mechanism 35 and second defective products recovery mechanism 36.

Specifically, the present embodiment can perform the encapsulation process of the battery cell according to the arrangement sequence of the mechanisms in the encapsulation station 3 as follows.

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

(2) The first encapsulating mechanism 32 is used for winding a transparent adhesive tape around the peripheral wall of one end close to the battery cell so as to encapsulate one end of the battery cell; the reversing mechanism 33 is used for exchanging the positions of the positive end and the negative end of the battery cell on the conveyor line 1; the second encapsulating mechanism 34 is used for winding a transparent adhesive tape on the peripheral wall close to the other end of the cell to implement an encapsulating operation on the other end of the cell.

Wherein, in order to improve the rubber coating efficiency to electric core, first rubber coating mechanism 32 and second rubber coating mechanism 34 all can set up a plurality ofly.

(3) The second detection mechanism 35 is configured to perform visual detection on the adhesive tape wound on the battery cell, so as to determine whether the size of the end portion of the adhesive tape exceeding the battery cell is within a preset range.

Therefore, if the size of the adhesive tape wound on the end part of the battery cell, which exceeds the end part of the battery cell, is larger than a preset value, the part of the adhesive tape, which exceeds the end part of the battery cell, can influence subsequent current collecting disc welding operation, so that the condition that the encapsulation of the battery cell is unqualified can be judged.

When the battery cell is subjected to visual inspection, an image of the battery cell can be acquired first, an image of a part of the adhesive tape, which exceeds the end part of the battery cell, is acquired by adopting an image segmentation mode according to the difference of pixels, and the length of the part of the adhesive tape is identified.

(4) The second defective product recycling mechanism 36 is configured to recycle the battery cells that are detected to be unqualified according to a detection result of the second detection mechanism 35.

In some embodiments, as shown in fig. 1 and 4, current collecting tray welding station 4 includes a positive current collecting tray welding unit 41 and an negative current collecting tray welding unit 42.

In practical application, the anode current collecting tray welding unit 41 and the cathode current collecting tray welding unit 42 can be sequentially arranged along the conveying direction of the conveying line 1, and the direction adjusting mechanism 43 is arranged between the anode current collecting tray welding unit 41 and the cathode current collecting tray welding unit 42, so that the positions of the positive end and the negative end of the battery cell on the conveying line 1 can be changed through the direction adjusting mechanism 43, and after the anode current collecting tray welding unit 41 performs current collecting tray welding on the positive end of the battery cell, current collecting tray welding can be sequentially performed on the cathode current collecting tray welding unit 42 on the negative end of the battery cell, and the continuity of the current collecting tray welding process is ensured.

Since the positive current collecting tray welding unit 41 and the negative current collecting tray welding unit 42 have the same structure, the present invention will describe the structure of the current collecting tray welding station 4 by taking the positive current collecting tray welding unit 41 as an example. The positive current collecting plate welding unit 41 may weld the positive current collecting plate without the flexible connection and the cover plate to the positive end of the battery cell, and the negative current collecting plate welding unit 42 may weld the negative current collecting plate with the flexible connection and the cover plate to the negative end of the battery cell.

Specifically, the positive collector tray welding unit 41 includes a third code scanning mechanism 411, a collector tray 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.

As shown in fig. 4, the third code scanning mechanism 411, the first welding and pressing mechanism 413, the third detection mechanism 415, and the third defective product recovery mechanism 416 are provided in this order along the conveying direction of the conveyor line 1.

As shown in fig. 4 and 5, the collecting tray feeding line 412 and the first welding mechanism 414 are disposed on one side of the conveying line 1, and the collecting tray feeding line 412 includes a collecting tray feeding mechanism 4121, a feeding positioning mechanism 4122, a temporary storage positioning mechanism 4123, a material distributing mechanism 4124, and a turnover mechanism 4125, which are sequentially disposed.

In practical application, the cell conveying operation of the conveying line 1 and the current collecting tray feeding operation of the current collecting tray feeding production line 412 are performed synchronously.

On transfer chain 1, the sign indicating number mechanism 411 is swept to the third is used for discerning and registering the first identification code on the electric core, sweeps the sign indicating number back to the electric core at the third and sweeps a sign indicating number mechanism 411, and electric core can reach first welding hold-down mechanism 413 under the transport of transfer chain 1 to wait for the material loading and the welding of current collecting plate.

Meanwhile, in the manifold tray feeding line 412, the manifold tray feeding mechanism 4121 transfers the manifold tray stored on the manifold tray feeder to the feeding positioning mechanism 4122 in a negative pressure adsorption manner, and the feeding positioning mechanism 4122 is used for performing first positioning on the received manifold tray.

The distributing mechanism 4124 is used for transferring the collecting tray stored by the feeding positioning mechanism 4122 to the temporary storage positioning mechanism 4123 in a negative pressure adsorption mode, and the temporary storage positioning mechanism 4123 is used for carrying out secondary positioning on the received collecting tray.

The turnover mechanism 4125 is configured to transfer the current collecting plate stored by the temporary storage positioning mechanism 4123 to the first welding and pressing mechanism 413, and the first welding and pressing mechanism 413 is configured to press the current collecting plate against the end to be welded of the electrical core, so that the first welding mechanism 414 welds the current collecting plate and the end to be welded of the electrical core into a whole.

It should be noted here that, in order to ensure the manifold disc welding effect, in this embodiment, the manifold disc may be distributed by the distributing mechanism 4124 to the temporary storage positioning mechanism 4123 provided in a plurality of welding stations, the plurality of welding stations are sequentially arranged along the conveying direction of the conveying line 1, each welding station is provided with the first welding pressing mechanism 413, the first welding pressing mechanisms 413 and the turnover mechanism 4125 are arranged in a one-to-one correspondence, and the turnover mechanisms 4125 and the temporary storage positioning mechanisms 4123 are arranged in a one-to-one correspondence.

Further, the third detection mechanism 415 of this embodiment is provided with a short-circuit detection assembly and a visual detection assembly, and can detect a short circuit of the electric core after the current collecting plate is welded through the short-circuit detection assembly and detect the welding quality of the current collecting plate through the visual detection assembly. In this way, the third defective product recovery mechanism 416 can recover the battery cells with unqualified welding quality according to the detection result of the third detection mechanism 415.

In some embodiments, as shown in fig. 1 and 6, the conveying line 1 corresponding to the case entering station 5 includes a cell conveying line 11 and a battery case conveying line 12.

The case entering station 5 is provided with a fourth code scanning mechanism 51, a cover plate deviation rectifying mechanism 52, a case code printing mechanism 54, a case code scanning mechanism 55, a case entering mechanism 57 and a fourth defective product recycling mechanism 58.

In the 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 cell conveying line 11.

In the battery case conveying line 12, a case coding mechanism 54, a case code scanning mechanism 55, a case cleaning mechanism 56, and a fourth defective product recovery mechanism 58 are provided in this order in the conveying direction of the battery case conveying line 12.

The case entering mechanism 57 is disposed between the cell conveying line 11 and the battery case conveying line 12 along the conveying direction of the cell conveying line 11, the case entering mechanism 57 is disposed at the rear side of the cover plate deviation rectifying mechanism 52, and the case entering mechanism 57 is disposed between the case code scanning mechanism 55 and the fourth defective product recycling mechanism 58 along the conveying direction of the battery case conveying line 12.

In order to prevent the deformation of the supplied battery case from affecting the case entering effect, a case shaping mechanism 53 is further arranged on the battery case conveying line 12, the case shaping mechanism 53 is used for performing roundness shaping on the open end of the battery case, and the case shaping mechanism 53 is arranged in front of the case coding mechanism 54.

Meanwhile, in order to prevent dust from adhering to the battery case and affecting the battery case entering effect, a case cleaning mechanism 56 is further provided on the battery case conveying line 12, and the case cleaning mechanism 56 is provided between the case code sweeping mechanism 55 and the case entering mechanism 57.

Specifically, the cell conveying line 11 performs the conveying operation of the cells and the battery case conveying line 12 performs the conveying operation of the battery cases synchronously. On electric core transfer chain 11, the fourth is swept a yard mechanism 51 and is swept the first identification code on the mode discernment of sign indicating number and the registration electric core with the rotation, then, when electric core carries to the station that apron mechanism 52 corresponds, apron mechanism 52 of rectifying can drive electric core rotation on the electric core transfer chain 11, the gesture of the apron of the negative pole end of electric core is adjusted, thereby rectify the position of apron, ensure that the apron is horizontal distribution, so that go into the shell operation to electric core through going into shell mechanism 57, prevent that the locating position of apron from bringing adverse effect to going into the shell operation.

On the battery case conveying line 12, the battery case can be transferred to the battery case conveying line 12 through the case feeding mechanism, and when the battery case is conveyed to a station corresponding to the case shaping mechanism 53, the case shaping mechanism 53 is used for performing roundness shaping on the open end of the battery case; next, the housing coding mechanism 54 marks a second identification code on the surface of the battery housing; next, the case code-scanning mechanism 55 identifies and registers the second identification code on the battery case; the housing cleaning mechanism 56 may then clean the battery housing by way of purging and vacuum suction. After the cleaned battery case is conveyed to the station corresponding to the case entering mechanism 57, the case entering mechanism 57 applies a driving force to the negative electrode end of the battery cell so as to press the battery cell on the battery cell conveying line 11 into the battery case on the battery case conveying line 12 until the positive electrode end of the battery cell is attached to the case bottom of the battery case. Finally, the semi-finished battery composed of the battery core and the battery shell is continuously conveyed on the battery shell conveying line 12.

If the battery case is badly scanned in the scanning of the battery case on the battery case conveying line 12, the fourth defective product recycling mechanism 58 can recycle the battery case with unqualified scanned codes according to the code scanning result of the casing code scanning mechanism 55.

In some embodiments, as shown in fig. 1 and 7, the positive electrode welding station 6 is provided with a fifth code scanning mechanism 61, a second welding pressing mechanism 62, a second welding mechanism 63, and a fifth defective product recovery mechanism 64.

Similarly, the positive electrode welding station 6 is also provided with two conveying lines 1, and each of the two conveying lines 1 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 in this order.

Specifically, the present embodiment can explain the welding process of the positive collector tray and the bottom end of the battery case as follows in the order of arrangement of the respective mechanisms in the positive welding station 6.

(1) The fifth code-scanning mechanism 61 can recognize and register the second identification code on the battery case by rotating the code. The fifth scanning mechanism 61 is similar in structure to the first scanning mechanism 22, and will not be described in detail.

(2) The second welding and pressing mechanism 62 is used for abutting against the negative end of the battery core, so that the positive current collecting plate is attached to the bottom end of the battery shell. The second welding pressing mechanism 62 may be provided with a tightening assembly and a rotation driving assembly, one end of the tightening assembly may abut against the negative end of the battery cell, and the other end of the tightening assembly abuts against the bottom end of the battery case, so as to ensure that the positive current collecting disc and the bottom end of the battery case are kept in a better fit state in the welding process; the rotary driving assembly is used for driving the battery core to rotate so as to weld the positive current collecting disc.

(3) The second welding mechanism 63 is used for welding the positive current collecting plate and the bottom end of the battery shell into a whole in a penetration welding mode to obtain a semi-finished battery. Under the condition that the second welding and pressing mechanism 62 ensures that the positive current collecting disc is well attached to the bottom end of the battery shell, laser penetration welding can be carried out on the bottom end of the battery shell, so that the positive current collecting disc and the bottom end of the battery shell are welded into a whole.

(4) The fifth defective product recovery mechanism 64 is configured to recover the semi-finished battery that is unqualified in code scanning according to the code scanning result of the fifth code scanning mechanism 61.

In some embodiments, as shown in fig. 1, the negative electrode welding station 7 includes a tack welding unit 71 and a seal welding unit 72 that are sequentially provided.

So, this embodiment can be connected the apron with the open end of battery case with the mode of spot welding through prespot welding unit 71 earlier when negative pole welding workstation 7 carries out the seal welding to the apron, and rethread seal welding unit 72 carries out the girth welding to the seam between the open end of apron and battery case.

In some embodiments, as shown in fig. 1 and 8, the tack welding unit 71 includes a sixth code scanning mechanism 711, a tab bending mechanism 712, a cover closing mechanism 713, a tack welding mechanism 714, a fourth detection mechanism 715, and a sixth defective recovery mechanism 716.

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

Specifically, the present embodiment can explain the tack welding process of the cover plate as follows in the order of arrangement of the respective mechanisms in the tack welding unit 71.

(1) The sixth code-scanning mechanism 711 may recognize and register the second identification code on the battery case by rotating the code.

(2) The tab bending mechanism 712 is used to bend the flexible connection between the anode current collecting disk and the cap plate such that the cap plate and the open end of the battery case are axially opposed. In the process of bending the tab, the battery cell can be centered and adjusted, and the flexible connection between the negative current collecting disc and the cover plate is bent for multiple times, so that the difficulty of bending operation is reduced. After the tabs are bent, the cover plate can be aligned and pressed to be adjusted, so that the cover plate and the open end of the battery case are oppositely arranged along the axial direction of the battery cell, and the cover closing operation of the battery is performed subsequently.

(3) Closure mechanism 713 is used to close the cover plate to the open end of the battery enclosure. Wherein, close and cover mechanism 713 and be provided with the rotation driving piece, the rotation driving piece is equipped with the bearing head and the propelling movement head of coaxial setting, and the bearing head bearing is in the bottom of battery case, and the propelling movement head is used for cooperating with the apron to drive apron and move towards the opening end of battery case, close the opening end in the battery case until the apron lid.

When the pre-spot welding operation is performed on the seam between the opening ends of the cover plate and the battery case through the pre-spot welding mechanism 714, the semi-finished battery lifted between the bearing head and the pushing head can be driven to rotate by the rotary driving piece, the laser head of the pre-spot welding mechanism 714 only needs to penetrate through the avoiding opening in the pushing head, and the seam between the opening ends of the cover plate and the battery case is subjected to laser spot welding, so that the operation is simple and convenient.

(4) The fourth detection mechanism 715 is used for performing short-circuit test on the semi-finished battery obtained after the pre-spot welding; the sixth defective recovery mechanism 716 is configured to recover the semi-finished battery that fails the short-circuit test, according to the detection result of the fourth detection mechanism 715.

It should be noted here that, in order to improve the effect of the tack welding on the cover plate, the present embodiment may provide a plurality of cover closing mechanisms 713 and tack welding mechanisms 714 on each conveyor line 1.

In some embodiments, as shown in fig. 1 and 9, the seal welding unit 72 includes a seventh code scanning mechanism 721, a seal welding mechanism 722, a cover code printing mechanism 723, a cover code scanning mechanism 724, a fifth detecting mechanism 725, and a seventh defective product recycling mechanism 726, which are sequentially arranged.

Similarly, the seal welding unit 72 is also provided with two conveying lines 1, and each of the two conveying lines 1 is provided with a seventh code scanning mechanism 721, a seal welding mechanism 722, a cover plate code printing mechanism 723, a cover plate code scanning mechanism 724, a fifth detection mechanism 725, and a seventh defective product recovery mechanism 726 in this order.

Specifically, the present embodiment can explain the seal welding process of the cap plate in the order of arrangement of the respective mechanisms in the seal welding unit 72 as follows.

(1) The seventh code scanning mechanism 721 recognizes and registers the second identification code on the battery case by rotating the code.

(2) The seal welding mechanism 722 is used to perform girth welding of the seam between the cap plate and the battery case.

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

(4) The fifth detection mechanism 725 is used for performing short circuit test on the semi-finished product battery subjected to seal welding; the seventh defective product recycling mechanism 726 is configured to recycle the semi-finished battery that fails the short circuit test according to the detection result of the fifth detecting mechanism 725.

It should be noted that, in order to improve the effect of the seal welding on the cover plate, in the present embodiment, on each conveyor line 1, a plurality of seal welding mechanisms 722 may be provided, and each seal welding mechanism 722 may perform laser girth welding on the seam between the cover plate and the battery case.

In some embodiments, as shown in fig. 1 and 10, the power battery automatic production line is further provided with a seal nail welding station 8; the seal nail welding station 8 is arranged on the rear side of the cathode welding station 7 along the conveying direction of the conveying line 1.

The sealing nail welding station 8 comprises a vision correcting mechanism 81, a rubber plug pulling mechanism 82, a helium gas 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 which are sequentially arranged.

This embodiment can dispose annular transfer chain to 8 configuration annular transfer chains in sealed nail welding work station, the first end and the second end of annular transfer chain set up in the homonymy of transfer chain 1, the vision is changeed positive mechanism 81, pull out plug mechanism 82, helium fills annotates mechanism 83, laser cleaning mechanism 84, go up nailing machine to be constructed 85, third welding mechanism 86, sign indicating number mechanism 87 is swept to the eighth, sixth detection mechanism 88 and eighth defective products retrieve mechanism 89 along setting up in order between the first end and the second end of annular transfer chain, first end at annular transfer chain is provided with feed mechanism, second end at annular transfer chain is provided with unloading mechanism.

In actual operation, the semi-finished product batteries conveyed on the conveying line 1 can be transferred to the battery carriers of the annular conveying line through the feeding mechanism, and each semi-finished product battery is rotatably arranged on each battery carrier.

Under the transport of annular transfer chain, the battery carrier is carrying semi-manufactured goods battery and is reacing the station that vision changes positive mechanism 81 place, and vision changes positive mechanism 81 and is used for carrying out the visual identification result based on annotating the liquid mouth on the apron, adjusts semi-manufactured goods battery's the gesture of putting to the drive head (for example, the drive head is holding head or vacuum adsorption head) that pulls out plug mechanism 82 can reach the position of annotating the liquid mouth place, with pull out the rubber buffer of cartridge on annotating the liquid mouth. The semi-finished battery of this embodiment is filled with an electrolyte.

Then, when the semi-finished product battery reaches the station where the helium filling mechanism 83 is located, the helium filling mechanism 83 can be controlled to fill the semi-finished product battery with helium through the liquid filling port. It should be noted that after helium is filled into the semi-finished battery, the liquid filling port is in an open state, and due to the fact that the welding time of the subsequent sealing nail is short, the subsequent helium detection operation on the battery is not affected by a small amount of helium leakage.

Then, when the semi-finished product battery reaches the cleaning station, the laser cleaning mechanism 84 is adopted to perform laser cleaning on the liquid injection port so as to ensure the cleanness of the liquid injection port and prevent the liquid injection port from influencing the subsequent welding quality of the sealing nail due to the existence of impurities.

Then, at last nail mechanism 85, the accessible negative pressure adsorption head is laid sealed nail in annotating the liquid mouth to after sealed nail cartridge in annotating the liquid mouth, accessible third welding mechanism 86 carries out the girth welding to sealed nail and annotate the gap between the liquid mouth, in order to realize the welding to sealed nail.

Next, the eighth code-scanning mechanism 87 recognizes and registers the second identification code on the battery case and/or the third identification code on the lid plate;

finally, a sixth detection mechanism 88 is used for visually detecting the welding quality of the seal nails, and an eighth defective product recovery mechanism 89 is used for recovering the semi-finished batteries with unqualified welding quality according to the detection result of the sixth detection mechanism 88.

It should be noted here that, in order to improve the welding efficiency of the seal nails, the nail feeding mechanism 85 and the third welding mechanism 86 of the present embodiment are provided in plural numbers one to one, and the nail feeding mechanism 85 and the third welding mechanism 86 are alternately arranged along the conveying direction of the endless conveyor line.

Meanwhile, the sixth detection mechanism 88 of this embodiment is not limited to visually detecting the welding quality of the seal nails, but may also detect the short circuit of the battery welded by the seal nails, and when the battery has no quality problem through the sixth detection mechanism 88, the battery may be transferred from the annular conveying line to the conveying line 1 shown in this embodiment through the blanking mechanism, so as to perform the subsequent battery warehousing operation.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a power battery automatic production line which characterized in that includes: the device comprises a conveying line, and a kneading and flattening station, a rubber coating station, a current collecting disc welding station, a shell entering station, an anode welding station and a cathode welding station which are sequentially arranged along the conveying direction of the conveying line;

2. The automatic power battery production line according to claim 1, wherein the flattening station comprises a first code scanning mechanism, a mechanical flattening mechanism, a dust removing mechanism, a first detection mechanism and a first defective product recycling mechanism which are arranged in sequence;

the dust removal mechanism is used for removing dust on the surface of the electric core;

3. The automatic power battery production line according to claim 1, wherein the rubber coating station comprises a second code scanning mechanism, a first rubber coating mechanism, a reversing mechanism, a second rubber coating mechanism, a second detection mechanism and a second defective product recycling mechanism which are sequentially arranged;

the first rubber coating mechanism is used for performing rubber coating operation on one end of the battery cell; the reversing mechanism is used for changing the position of the positive end and the negative end of the battery cell on the conveying line; the second rubber coating mechanism is used for performing rubber coating operation on the other end of the battery cell;

the second detection mechanism is used for carrying out visual detection on the adhesive tape wound on the battery cell so as to judge whether the size of the adhesive tape exceeding the end part of the battery cell is within a preset range;

4. The automatic power battery production line of claim 1, wherein the collector plate welding station comprises a positive collector plate welding unit and an negative collector plate welding unit, and each of the positive collector plate welding unit and the negative collector plate welding unit comprises a third code scanning mechanism, a collector plate feeding production line, a first welding and pressing mechanism, a first welding mechanism, a third detection mechanism and a third defective product recycling mechanism;

5. The automatic power battery production line according to claim 1, wherein the conveying lines corresponding to the case entering work station comprise a battery cell conveying line and a battery case conveying line;

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; the battery cell feeding mechanism is used for pressing the battery cell on the battery cell conveying line into the battery shell on the battery shell conveying line;

and the fourth defective product recycling mechanism is used for recycling the battery shell with unqualified scanned codes according to the code scanning result of the code scanning mechanism of the shell.

6. The automatic power battery production line according to claim 1, wherein the positive electrode welding station is provided with a fifth code scanning mechanism, a second welding pressing mechanism, a second welding mechanism and a fifth defective product recycling mechanism;

7. The automatic power battery production line of claim 1, wherein the negative electrode welding station comprises a pre-spot welding unit and a seal welding unit which are arranged in sequence;

the pre-spot welding unit is used for connecting the cover plate with the open end of the battery case in a spot welding mode; the seal welding unit is used for carrying out girth welding on a joint between the cover plate and the open end of the battery case.

8. The automatic power battery production line of claim 7, wherein 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 fourth detection mechanism is used for carrying out short circuit test on the semi-finished product battery obtained after the pre-spot welding;

and the sixth defective product recovery mechanism is used for recovering the semi-finished product battery unqualified in the short circuit test according to the detection result of the fourth detection mechanism.

9. The automatic power battery production line according to claim 7, wherein the seal welding unit comprises a seventh code scanning mechanism, a seal welding mechanism, a cover plate code printing mechanism, a cover plate code scanning mechanism, a fifth detection mechanism and a seventh defective product recycling mechanism which are sequentially arranged;

10. The automatic power battery production line according to any one of claims 1 to 9, further comprising a seal nail welding station; the sealing nail welding station is arranged on the rear side of the cathode welding station along the conveying direction of the conveying line;

the sealing nail welding work station comprises a vision correcting mechanism, a rubber plug pulling mechanism, a helium filling mechanism, a nail feeding mechanism, a third welding mechanism, an eighth code scanning mechanism, a sixth detection mechanism and an eighth defective product recovery mechanism which are sequentially arranged;

the sixth detection mechanism is used for visually detecting the welding quality of the sealing nail;

and the seventh defective product recycling mechanism is used for recycling the semi-finished product battery with unqualified welding quality according to the detection result of the sixth detection mechanism.