A device for preventing the folding of the tab of a pole piece

Abstract

The utility model discloses a kind of device for preventing folding tab of pole piece, including winding mechanism and several smoothing mechanisms, winding mechanism and smoothing mechanism are all installed in machine table interior, and several smoothing mechanisms are sequentially arranged along the pole piece conveying direction, respectively the upper and lower surfaces of pole piece are smoothed and handled;Smoothing mechanism includes two first telescopic components and the smoothing piece of being set to first telescopic component end, and two first telescopic components are communicated by first air pipe between. The utility model structure is simple, by setting multiple smoothing mechanisms, the pole piece after smoothing plate can be secondly smoothed and handled, effectively compensate the deficiency of primary smoothing, simultaneously, by the synergic cooperation of first telescopic component, first air pipe, first solenoid valve, smoothing piece and first drive component, the pole piece with abnormal tab can be smoothed, prevent its direct entry winding procedure, to avoid the irreversible quality accident caused by folding tab defect, significantly improve product yield and production reliability.

Description

Technical Field

[0001] This utility model relates to the field of electrode processing technology, specifically a device for preventing electrode tabs from bending. Background Technology

[0002] In the automated production process of lithium batteries, core winding is one of the core processes, and its forming quality directly affects the battery's energy density, cycle life, safety performance, and consistency. The tabs, as key conductive components leading from the positive and negative current collectors, are typically thin metal foil strips. During the unwinding and transport of the electrode sheets, they are highly susceptible to deformation such as folding and bending due to uneven tension or improper guidance. If electrode sheets with folded tabs enter the winding process, it will lead to serious quality problems: on the one hand, folded tabs increase the resistance of the conductive path, significantly increasing the battery's internal resistance, causing capacity decay and accelerated heat generation; on the other hand, the bent parts of the tabs are prone to stress concentration and localized overheating during long-term charge-discharge cycles, increasing the risk of short circuits and potentially causing thermal runaway, threatening battery safety. Furthermore, defective products caused by folded tabs require rework or direct scrapping, which not only increases raw material and labor costs but also reduces overall production efficiency and product yield.

[0003] Currently, to prevent electrode tab folding, production lines generally install mechanical smoothing plates at the front end of the winding mechanism to initially smooth the electrode tabs. However, existing technologies have significant shortcomings: they rely solely on the smoothing plate for initial smoothing and lack an effective secondary smoothing and automatic rework mechanism. If the initial smoothing is incomplete, the electrode tab folding defect cannot be corrected and will directly enter the winding process, leading to irreversible quality accidents. Therefore, a device for preventing electrode tab folding is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a device for preventing electrode tabs from bending, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for preventing electrode tabs from bending, comprising a winding mechanism and several smoothing mechanisms. Both the winding mechanism and the smoothing mechanisms are installed inside the machine tool, and the several smoothing mechanisms are arranged sequentially along the electrode conveying direction to smooth the upper and lower surfaces of the electrode respectively. Each smoothing mechanism includes two first telescopic components and a smoothing element disposed at the end of the first telescopic components. The two first telescopic components are connected by a first air pipe, on which a first solenoid valve is installed. The ends of the two first telescopic components away from the smoothing element are respectively connected to both ends of a first driving component. When smoothing the bent electrode, gas is injected into the first telescopic component through the first air pipe, driving the smoothing element at its end to extend and contact the electrode surface. Subsequently, the first driving component drives the two first telescopic components to move relative to each other, causing the smoothing element to complete the smoothing operation on the bent electrode.

[0006] As a further embodiment of this utility model: the winding mechanism includes a first servo motor, the end of the first servo motor is equipped with a connecting roller, and the outer peripheral surface of the connecting roller is provided with an electrode winding shaft.

[0007] As a further embodiment of this utility model: it further includes a plurality of guide rollers, which are arranged sequentially along the electrode conveying direction and keep in contact with the surface of the electrode, and the plurality of guide rollers are all connected to the machine base.

[0008] As a further embodiment of this utility model: the number of rollers is five, and the five rollers are respectively the first roller, the second roller, the third roller, the fourth roller and the fifth roller, wherein the first roller is the one that contacts the electrode first in the electrode conveying forward direction.

[0009] As a further embodiment of this invention, a second servo motor is further included, which is mounted on the first roller.

[0010] As a further embodiment of this utility model: a smoothing plate is installed at the output end of the second servo motor for smoothing the electrode sheet passing through the first roller.

[0011] As a further embodiment of this utility model: it further includes a shaping mechanism, which includes a second driving component and second telescopic components disposed at both ends of the second driving component. Each of the ends of the two second telescopic components away from the second driving component is equipped with a connecting rod, and each of the opposite ends of the two connecting rods is equipped with an electrode tab pressure plate. The two electrode tab pressure plates are respectively located on the upper and lower surfaces of the electrode sheet. The two second telescopic components are connected by a second air pipe, and a second solenoid valve is installed on the second air pipe.

[0012] As a further embodiment of this utility model: the ends of the first solenoid valve and the second solenoid valve are both equipped with gas supply pipes connected to the gas storage tank, and the first drive assembly and the second drive assembly are both equipped with third gas pipes connected to the gas storage tank, and the third gas pipes are equipped with third solenoid valves.

[0013] As a further embodiment of this utility model, it further includes a plurality of cameras mounted on a machine base.

[0014] As a further embodiment of this utility model, it further includes a control display terminal, which is electrically connected to a plurality of cameras, a first solenoid valve, a second solenoid valve, a third solenoid valve, a first drive assembly, a second drive assembly, a first servo motor, and a second servo motor.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This application, by setting up multiple smoothing mechanisms, can perform secondary smoothing on the electrode sheets after they have been smoothed by the smoothing plate, effectively making up for the deficiencies of the initial smoothing. At the same time, through the coordinated cooperation of the first telescopic component, the first air pipe, the first solenoid valve, the smoothing component and the first drive component, it can smooth the electrode sheets with abnormal tabs, preventing them from directly entering the winding process, thereby avoiding irreversible quality accidents caused by tab defects, and significantly improving product yield and production reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the electrode tab anti-bending device of this utility model; Figure 2 This is a schematic diagram of the control and display terminal of this utility model; Figure 3 This is a schematic diagram of the smoothing mechanism of this utility model; Figure 4 This is a schematic diagram of the shaping mechanism of this utility model; Figure 5 This is a schematic diagram of the flat surface of this utility model; In the diagram: 1. Winding mechanism; 101. First servo motor; 102. Connecting roller; 103. Electrode roll; 2. Smoothing mechanism; 201. First telescopic assembly; 202. Smoothing component; 203. First air pipe; 204. First solenoid valve; 205. First drive assembly; 3. Passing roller; 31. First passing roller; 32. Second passing roller; 33. Third passing roller; 34. Fourth passing roller; 35. Fifth passing roller; 4. Second servo motor; 5. Smoothing plate; 6. Shaping mechanism; 601. Second drive assembly; 602. Second telescopic assembly; 603. Connecting rod; 604. Electrode tab pressure plate; 605. Second air pipe; 606. Second solenoid valve; 7. Air tank; 8. Third air pipe; 9. Third solenoid valve; 10. Camera; 11. Control display terminal. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 In this embodiment of the invention, a device for preventing electrode tabs from bending includes a winding mechanism 1 and several smoothing mechanisms 2. Both the winding mechanism 1 and the smoothing mechanisms 2 are installed inside the machine tool, and the several smoothing mechanisms 2 are arranged sequentially along the electrode conveying direction to smooth the upper and lower surfaces of the electrode respectively. Each smoothing mechanism 2 includes two first telescopic components 201 and a smoothing element 202 disposed at the end of the first telescopic components 201. The two first telescopic components 201 are connected by a first air pipe 203, on which a smoothing element 202 is installed. The first solenoid valve 204 and the ends of the two first telescopic components 201 away from the smoothing member 202 are respectively connected to the two ends of the first drive component 205. When smoothing the bent electrode, gas is injected into the first telescopic component 201 through the first air pipe 203 to drive the end of the first telescopic component 201 to extend. The smoothing member 202 at its end moves accordingly and contacts the surface of the electrode. Then, the first drive component 205 drives the two first telescopic components 201 to move relative to each other, so that the smoothing member 202 completes the smoothing operation of the bent electrode.

[0019] Specifically, the number of smoothing mechanisms 2 is not limited. In this embodiment, there are two smoothing mechanisms 2, which smooth the upward and downward bending of the electrode sheets respectively. The first telescopic component 201 is a telescopic cylinder, which includes a cylinder barrel and a piston rod that moves along its length. The smoothing component 202 is installed at the end of the piston rod. The first air pipe 203 is a three-way pipe, with both ends connected to the cylinder barrels of the two first telescopic components 201 respectively, and communicating with the inside of the cylinder barrels. The other end is connected to the first solenoid valve 204. The solenoid valve 204 controls the flow of gas inside the first air pipe 203, thereby controlling the extension or retraction of the piston rod (and the solenoid valve 204 controls the first air pipe 203 to achieve telescopic operation). The principle of cylinder extension and retraction is existing technology and will not be elaborated here. When the electrode needs to be smoothed, the solenoid valve 204 is opened, and gas enters the first extension component 201 through the first air pipe 203. At this time, the smoothing component 202 extends and gradually approaches the electrode. The first air pipe 203 is made of flexible material and has a certain length reserved for adjusting the distance between the two first extension components 201. The ends of the two first extension components 201 are respectively installed at both ends of the first drive component 205. The first drive component 205 drives the two first extension components 201 to reciprocate. The first drive component 205 is a cylinder, which drives the two smoothing components 202 in contact with the electrode to smooth the bent electrode.

[0020] Please see Figure 1 In one embodiment, preferably, the winding mechanism 1 includes a first servo motor 101, and a connecting roller 102 is mounted on the end of the first servo motor 101. The outer peripheral surface of the connecting roller 102 is provided with an electrode roll 103. Furthermore, the first servo motor 101 drives the connecting roller 102 to rotate, and the connecting roller 102 drives the electrode roll 103 mounted on its outer peripheral surface to rotate, thereby completing the winding and unwinding of the electrode.

[0021] Please see Figure 1 In one embodiment, preferably, it further includes a plurality of guide rollers 3, which are arranged sequentially along the electrode conveying direction and keep in contact with the surface of the electrode. The plurality of guide rollers 3 are all connected to the machine base. The number of guide rollers 3 is five, and the five guide rollers 3 are respectively the first guide roller 31, the second guide roller 32, the third guide roller 33, the fourth guide roller 34 and the fifth guide roller 35. In the electrode conveying forward direction, the first guide roller 31 is the first to contact the electrode, thereby completing the smooth conveying of the electrode.

[0022] Please see Figure 1 and Figure 5In one embodiment, preferably, a second servo motor 4 is further included. The second servo motor 4 is mounted on the first guide roller 31. A smoothing plate 5 is mounted on the output end of the second servo motor 4 for smoothing the electrode sheets passing through the first guide roller 31. As the diameter of the electrode roll 103 changes, the tilt angle between the electrode sheets conveyed by the electrode roll 103 and the first guide roller 31 will also change. The angle can be adjusted by adjusting the smoothing plate 5 through the second servo motor 4, thereby adapting to electrode rolls 103 of different sizes, ensuring a continuous and good smoothing effect, saving manpower, reducing the electrode tab rate, and improving the safety performance of the battery cell.

[0023] Please see Figure 4 In one embodiment, preferably, it further includes a shaping mechanism 6, which includes a second driving component 601 and second telescopic components 602 disposed at both ends of the second driving component 601. The ends of the two second telescopic components 602 away from the second driving component 601 are each equipped with a connecting rod 603, and the opposite ends of the two connecting rods 603 are each equipped with an electrode tab 604. The two electrode tab 604 are respectively located on the upper and lower surfaces of the electrode sheet. The two second telescopic components 602 are connected by a second air pipe 605, and a second solenoid valve 606 is installed on the second air pipe 605.

[0024] Specifically, there are two second telescopic components 602, which are fixedly installed at both ends of the second drive component 601. The second drive component 601 drives the two second telescopic components 602 to reciprocate. The second drive component 601 is a cylinder. In addition, the second air pipe 605 is a three-way pipe, with one end connected to the two second telescopic components 602 and the other end connected to the second solenoid valve 606. The second solenoid valve 606 controls the flow of gas inside the second air pipe 605, thereby controlling the extension or retraction of the connecting rod 603 and the electrode tab 604. The second telescopic component 602 is a telescopic cylinder. When the second drive component 601 drives the two second telescopic components 602 to reciprocate, the U-shaped reinforcing ribs on the surface of the electrode tab 604 can act on the electrode to shape it, making it less prone to bending. At the same time, the second air pipe 605 is also made of flexible material and has a certain length reserved to accommodate the reciprocating motion between the two second telescopic components 602.

[0025] Please see Figure 1In one embodiment, preferably, the ends of the first solenoid valve 204 and the second solenoid valve 606 are both equipped with gas supply pipes connected to the gas storage tank 7, and the first drive assembly 205 and the second drive assembly 601 are both equipped with third gas pipes 8 connected to the gas storage tank 7. The third gas pipes 8 are equipped with third solenoid valves 9. Furthermore, a plurality of third solenoid valves 9 control the flow of gas inside the third gas pipes 8, thereby controlling the opening and closing of the first drive assembly 205 and the second drive assembly 601.

[0026] Please see Figure 1 In one embodiment, preferably, it further includes several cameras 10 mounted on the machine platform. The cameras 10 are industrial cameras that can collect various data during the electrode conveying process and feed them back to the control display terminal 11. Furthermore, the number of cameras 10 is not limited. In this embodiment, preferably, the number of cameras 10 is four, which are used to detect the diameter of the electrode roll 103 and whether there is bending on the upper and lower parts of the electrode.

[0027] Please see Figure 1 In one embodiment, preferably, it further includes a control display terminal 11, which is electrically connected to a plurality of cameras 10, a first solenoid valve 204, a second solenoid valve 606, a third solenoid valve 9, a first drive component 205, a second drive component 601, a first servo motor 101, and a second servo motor 4. The control display terminal 11 issues corresponding instructions based on the data fed back by the cameras 10.

[0028] The working principle and usage process of this utility model are as follows: The first servo motor 101 is started, driving the electrode roll 103 to rotate clockwise or counterclockwise. The roll diameter data of the electrode roll 103 detected by the camera 10 is processed by the control display terminal 11 and fed back to the second servo motor 4, driving the smoothing plate 5 to rotate. The smoothing plate 5 smooths the electrode tabs of the electrode roll 103. The camera 10 detects the state of the electrode tabs after the electrode passes through the second roller 32. When an electrode tab is detected to be folded upwards, the control display terminal 11 sends a signal to the first servo motor 4. Servo motor 101 rotates counterclockwise, causing the folded tabs to move in front of the corresponding smoothing component 202. At this time, the first telescopic component 201 extends forward, and the first drive component 205 controls the first telescopic component 201 to drive the smoothing component 202 to open to the left and right, thereby smoothing the upward-folded tabs. After smoothing, the first servo motor 101 rotates clockwise, and the first solenoid valve 204 controls the first telescopic component 201 to move backward. When another camera 10 detects that a tab is folded downward, it controls the display terminal 11 to send... A signal is sent to the first servo motor 101 to rotate counterclockwise, causing the folded electrode tab to move in front of the corresponding smoothing component 202. At this time, the first telescopic component 201 extends forward, and the first drive component 205 controls the first telescopic component 201 to drive the smoothing component 202 to open to the left and right, thereby smoothing the downward-folded electrode tab. After smoothing, the first servo motor 101 rotates clockwise. At this time, the first solenoid valve 204 controls the first telescopic component 201 to move backward. In addition, another camera 10 performs a retest on the smoothed electrode sheet, such as... If the tab is found to be folded, a signal is sent to the control display terminal 11 to stop the machine and prompt the personnel to rework the tab before continuing production. If there is no tab folding, a signal is sent to the first servo motor 101 to rotate clockwise, so that the reworked tab moves to the front of the tab pressure plate 604. The second drive component 601 drives the second telescopic component 602 to move towards the center, causing the tab pressure plate 604 to be in a clamping state, clamping the tab. The U-shaped reinforcing ribs at the bottom of the tab pressure plate act on the tab to shape it, making it less prone to bending.

[0029] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0030] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A device for preventing electrode tabs from folding, characterized in that, The device includes a winding mechanism and several smoothing mechanisms, both of which are installed inside the machine. The smoothing mechanisms are arranged sequentially along the electrode conveying direction to smooth the upper and lower surfaces of the electrode. Each smoothing mechanism includes two first telescopic components and a smoothing element disposed at the end of the first telescopic components. The two first telescopic components are connected by a first air pipe, on which a first solenoid valve is installed. The ends of the two first telescopic components away from the smoothing element are respectively connected to the two ends of a first drive component. When smoothing the bent electrode, gas is injected into the first telescopic components through the first air pipe to drive the smoothing element at its end to extend and contact the electrode surface. Subsequently, the first drive component drives the two first telescopic components to move relative to each other, so that the smoothing element completes the smoothing operation on the bent electrode.

2. The device for preventing electrode tabs from folding according to claim 1, characterized in that, The winding mechanism includes a first servo motor, and a connecting roller is installed at the end of the first servo motor. The outer circumferential surface of the connecting roller is provided with an electrode winding shaft.

3. The device for preventing electrode tabs from folding according to claim 2, characterized in that, It further includes several guide rollers, which are arranged sequentially along the electrode conveying direction and keep in contact with the surface of the electrode. All the guide rollers are connected to the machine base.

4. The device for preventing electrode tabs from bending according to claim 3, characterized in that, The number of rollers is five, and the five rollers are the first roller, the second roller, the third roller, the fourth roller and the fifth roller, wherein the first roller is the one that contacts the electrode first in the forward direction of electrode conveying.

5. The device for preventing electrode tabs from bending according to claim 4, characterized in that, It further includes a second servo motor, which is mounted on the first guide roller.

6. The device for preventing electrode tabs from folding according to claim 5, characterized in that, The output end of the second servo motor is equipped with a smoothing plate, which is used to smooth the electrode sheets passing through the first roller.

7. The device for preventing electrode tabs from bending according to claim 6, characterized in that, The device further includes a shaping mechanism, which includes a second driving assembly and second telescopic assemblies disposed at both ends of the second driving assembly. Each of the two second telescopic assemblies has a connecting rod installed at the end away from the second driving assembly, and each of the two connecting rods has an electrode tab pressure plate installed at the opposite end. The two electrode tab pressure plates are respectively located on the upper and lower surfaces of the electrode sheet. The two second telescopic assemblies are connected by a second air pipe, and a second solenoid valve is installed on the second air pipe.

8. The device for preventing electrode tabs from folding according to claim 7, characterized in that, Both the first and second solenoid valves are equipped with gas supply pipes connected to the gas storage tank at their ends, and both the first and second drive assemblies are equipped with third gas pipes connected to the gas storage tank, with a third solenoid valve installed on the third gas pipe.

9. The device for preventing electrode tabs from bending according to claim 8, characterized in that, It further includes several cameras mounted on the machine platform.

10. The device for preventing electrode tabs from folding according to claim 9, characterized in that, The system further includes a control display terminal, which is electrically connected to several cameras, a first solenoid valve, a second solenoid valve, a third solenoid valve, a first drive assembly, a second drive assembly, a first servo motor, and a second servo motor.

Images