Anti-cracking rolling device for pole piece for processing lithium ion battery

Abstract

The utility model discloses an anti-cracking rolling device for a pole piece for processing a lithium ion battery, which belongs to the technical field of lithium battery production and comprises an impurity removal box arranged between a roller box and an unwinding table. A guide roller is rotationally mounted in a sheet inlet of the impurity removal box, a fan is mounted at the top end, through grooves are formed in the two side walls, and the fan is connected with the through grooves through air guide pipes; a smoothing assembly is further arranged in the impurity removal box and comprises a smoothing roller and a guide piece, and the two ends of the smoothing roller are slidably connected with the side wall of the impurity removal box. By arranging the impurity removal box, the surface of the pole piece to be rolled is cleaned before the pole piece is conveyed to the roller box, hard small particles on the surface of the pole piece are removed, the situation that the small particles extrude a foil belt is reduced, and therefore the situation that the foil belt is broken and even the pole piece is broken due to the fact that the foil belt is broken is reduced; the flattening assembly capable of changing the height difference in the pole piece conveying process is additionally arranged in the impurity removal box, the wrinkles of the pole pieces can be flattened, the pole pieces can also be vibrated, and therefore the draught fan is assisted in removing particulate matter.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery production, and in particular relates to a pole piece anti-cracking rolling device for processing lithium ion batteries. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] After the battery electrode is coated and dried, the peel strength between the active material and the current collector foil is very low. At this time, the electrode needs to be rolled to enhance the bonding strength between the active material and the foil to prevent the active material and foil from peeling off during the electrode immersion in electrolyte and battery use.

[0004] Battery electrode rolling is a process in which the friction between the rollers and the battery electrode pulls the battery electrode between the rotating rollers, causing the battery electrode to be compressed and deformed. The purpose is to increase the compaction density of the positive or negative electrode material; appropriate compaction density can increase the discharge capacity of the battery, reduce internal resistance, reduce polarization loss, extend the cycle life of the battery, and improve the utilization rate of the lithium battery.

[0005] In the prior art, during the electrode roll pressing process, the electrode often breaks suddenly during transport. This is usually caused by small particles remaining on the electrode surface, resulting in uneven surface texture. During rolling, the small particles are pressed against the foil by the pressure of the two rollers. The hard particles can squeeze the foil, causing holes or even breakage in the foil. Utility Model Content

[0006] In response to the above problems, the utility model provides a device for rolling pole pieces to prevent rupture for lithium-ion battery processing. The device can remove small particles on the surface of the pole piece by blowing air on the surface of the pole piece and vibrating the pole piece, thereby preventing small particles from squeezing the foil and causing the pole piece to rupture; and can smooth the pole piece before rolling.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A device for rolling electrodes for lithium-ion battery processing to prevent cracking includes a roll box, a reeling table is provided at the front end of the roll box, a reeling table is provided at the rear end, a power distribution box is provided on one side of the roll box, and the reeling roller of the reeling table and the rolling roller of the roll box are driven by respective drive motors;

[0009] A dust removal box is provided between the roll box and the unwinding platform; the interior of the dust removal box is hollow, and the side of the dust removal box close to the unwinding platform is the film inlet, in which a guide roller is rotatably installed; the other side is the film outlet;

[0010] A blower is installed at the top of the impurity removal box, and through slots are opened on both side walls. The two sides of the blower are connected to the through slots through air ducts.

[0011] A flattening component is further arranged in the impurity removal box. The flattening component includes a flattening roller and guide pieces. Both ends of the flattening roller are slidably connected to the side walls of the impurity removal box, and the guide pieces are installed on the top of the partition plate.

[0012] Preferably, one end of the partition plate coincides with the sheet outlet, and the other end is close to the guiding roller; a threaded hole is opened on the bottom wall on one side of the sheet outlet of the impurity removal box, and a threaded hole is also opened at the corresponding position of the partition plate, and the partition plate is fixed in the impurity removal box through a bolt.

[0013] Preferably, the guide pieces are arranged on the top of the partition plate between the position close to the guiding roller and the through slot.

[0014] Preferably, a set of "mouth"-shaped sliding grooves are opened on each of the two side walls of the impurity removal box, and both ends of the flattening roller are respectively installed in the "mouth"-shaped sliding grooves on the two side walls of the impurity removal box; one end of the "mouth"-shaped sliding groove is close to the guiding roller, and one end is close to the through slot.

[0015] Preferably, when the flattening roller is located at the lower part of the "mouth"-shaped sliding groove, the flattening roller can contact the guide pieces.

[0016] Preferably, bearings are arranged at both ends of the flattening roller, and rollers matching with the "mouth"-shaped sliding grooves are arranged on the outer circumferences of the bearings.

[0017] Preferably, a driving member is arranged outside one side of the impurity removal box, and a protective cover is arranged outside the driving member; one end of the flattening roller close to the driving member extends out of the impurity removal box and is connected to the driving member.

[0018] Preferably, the driving member adopts a cylinder assembly, including two cylinders. The output end of cylinder one is connected to the cylinder body of cylinder two, and the output end of cylinder two is connected to the flattening roller; alternatively, the driving member further includes a motor, the body of the motor is connected to the output end of cylinder two, and the output end of the motor is connected to the flattening roller.

[0019] Preferably, the sheet outlet of the impurity removal box is connected to the two side plates of the rolling mill box; both sides of the sheet inlet of the impurity removal box are connected to the two side plates of the unwinding table, and the width of the sheet inlet is greater than the distance between the two side plates of the unwinding table.

[0020] Preferably, a control box is further installed on one side of the winding table. A controller is arranged in the control box. The controller is connected to the driving motor, each driving member and the blower; a control console is arranged on the upper part of the control box, and a switch push rod and each control button are arranged on the control console; each control button is connected to the controller, and the switch push rod is connected between the controller and the distribution box.

[0021] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0022] The utility model provides a dust removal box to clean the surface of the pole piece to be rolled before it is transported to the rolling box, thereby removing hard small particles on the surface of the pole piece and reducing the situation where small particles squeeze the foil, thereby reducing the pole piece rupture caused by foil holes or even foil breakage; a smoothing component that can change the height difference during the transmission of the pole piece is added to the dust removal box, which can not only smooth the wrinkles on the pole piece, but also make the pole piece vibrate, thereby assisting the fan to remove particulate matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 This is a left side view of the overall structure of the embodiment of the utility model;

[0025] Figure 2 This is a right side view of the overall structure of the embodiment of the utility model;

[0026] Figure 3 It is a right side sectional view of the debris removal box of an embodiment of the utility model;

[0027] In the picture:

[0028] 1. Roller box; 2. Winding table; 3. De-duster box; 4. Rolling roller; 5. Winding roller; 6. Sheet inlet; 7. Sheet outlet; 8. Fan; 9. Through slot; 10. Air duct; 11. Smoothing roller; 12. Sheet guide; 13. Partition; 14. Guide roller; 15. Distribution box; 16. Control box; 17. Control console; 18. Unwinding table. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] The present invention is described in detail below with reference to the accompanying drawings. The present embodiment discloses a device for rolling a pole piece to prevent cracking for processing a lithium-ion battery. Figure 1 As shown, it includes a roll box 1, which is used to roll the pole pieces. The front end of the roll box 1 is connected to the unwinding table 18 through the impurity removal box 3. The pole pieces on the unwinding table 18 are first cleaned by the impurity removal box 3 and then enter the roll box 1 for rolling; the rear end of the roll box 1 is provided with a winding table 2, which is used to wind up the pole pieces that have been rolled.

[0031] like Figure 1 As shown, the roll box 1 adopts the existing technology. Two rolling rollers 4 are rotatably connected in the roll box 1. The rolling rollers 4 are arranged adjacent to each other. The rolling rollers 4 are driven to rotate by a driving motor. The two rolling rollers 4 rotate in opposite directions. When the pole piece passes through the two rolling rollers 4, the pole piece is rolled; a distribution box 15 is provided on one side of the roll box 1, and the distribution box 15 provides power to the equipment of the entire device.

[0032] like Figure 1 、 Figure 2 As shown, a plurality of winding rollers 5 are rotatably connected to the winding table 2. In this embodiment, there are three winding rollers 5, which are used to rewind the electrode sheets that have been rolled. It is understood that the unwinding table 18 and the winding table 2 both adopt existing technology, and the winding rollers are also driven by a drive motor. The unwinding table 18 has an unwinding roller, and both the unwinding roller and the winding roller are detachable. The unwinding table is used to place the electrode sheets that need to be rolled, and the winding table is used to rewind the electrode sheets that have been rolled. The rotation speed of the rolling roller 4 needs to be consistent with the rewinding speed of the winding roller 5 to prevent damage to the electrode sheets. When the winding roller starts or stops, the rolling roller also starts or stops.

[0033] like Figure 1 、 Figure 2 、 Figure 3 As shown, the dust removal box 3 is installed between the roll box 1 and the unwinding table 18. A sheet inlet 6 is provided on the side of the dust removal box 3 near the unwinding table 18. Both sides of the sheet inlet 6 are connected to the two side panels of the unwinding table 18. The width of the sheet inlet 6 is greater than the distance between the two side panels of the unwinding table 18, allowing the unwound electrode sheet to pass through the sheet inlet 6 and enter the dust removal box 3. A guide roller 14 is installed on the side of the dust removal box 3 near the sheet inlet 6. The guide roller 14 is rotatably connected to the dust removal box 3 and is used to guide the electrode sheet wound up by the unwinding table 18 into the dust removal box 3. A sheet outlet 7 is provided on the side of the dust removal box 3 away from the sheet inlet 6. The sheet outlet 7 is connected to the two side panels of the roll box 1. The electrode sheet, after removing surface debris, leaves the dust removal box through the sheet outlet 7 and enters the roll box 1. It should be noted that the electrode sheet enters the dust removal box from the bottom of the guide roller 14.

[0034] like Figure 1 、 Figure 3 As shown, the interior of the dust removal box 3 is hollow, with the height dimension of the opening at one end of the film inlet 6 being greater than the height dimension of the opening at the other end of the film outlet 7. A fan 8 is mounted on the top of the dust removal box 3, and through slots 9 are provided on both sides of the dust removal box 3 where the fan 8 is located. An air duct 10 is mounted on each side of the fan 8, one end of which is connected to the fan 8, and the other end is connected to the through slots 9. The fan 8 can blow air into the dust removal box 3 through the through slots 9 on both sides, thereby clearing small particles from the surface of the electrode sheets in the dust removal box.

[0035] like Figure 3As shown in the figure, a flattening component is also provided in the impurity removal box 3; the flattening component includes a flattening roller 11 and a guide piece 12, and both ends of the flattening roller 11 are slidably connected to the side walls of the impurity removal box 3; as Figure 3 As shown in the figure, a set of "mouth"-shaped chutes are respectively opened on the two side walls of the impurity removal box 3, and both ends of the flattening roller 11 are respectively installed in the "mouth"-shaped chutes on the two side walls of the impurity removal box 3. One end of the "mouth"-shaped chute is close to the guide roller 14, and the other end is close to the through groove 9. It can be understood that bearings are provided at both ends of the flattening roller 11, and rollers matching the "mouth"-shaped chute are provided on the outer circumference of the bearings, so that when the flattening roller 11 slides in the "mouth"-shaped chute, the friction can be reduced, and the flattening roller can rotate relative to the impurity removal box 3.

[0036] As Figure 2 As shown in the figure, a driving member is provided outside one side of the impurity removal box, and a protective cover is provided outside the driving member. The driving member can drive the flattening roller to slide along the "mouth"-shaped chute, and the power source of the driving member is the distribution box 15; one end of the flattening roller 11 close to the driving member extends out of the impurity removal box and is connected to the driving member; in this embodiment, the driving member adopts a cylinder assembly, and the output end of the cylinder assembly is connected to the flattening roller 11. Through the telescopic movement of the cylinder assembly, the flattening roller 11 can reciprocate. It can be understood that the cylinder assembly here includes two cylinders, wherein the output end of the first cylinder is connected to the cylinder body of the second cylinder, and the output end of the second cylinder is connected to the flattening roller 11. By controlling the telescopic actions of the two cylinders, the flattening roller 11 can reciprocate along the "mouth"-shaped chute. The flattening roller 11 can flatten the wrinkles of the pole pieces transported into the impurity removal box 3, and prevent the pole pieces from breaking due to wrinkles during the winding process of the winding roller 5.

[0037] It can be understood that the driving member can also include a motor, the body of the motor is connected to the output end of the second cylinder, and the output end of the motor is connected to the flattening roller 11; it can be realized that when the flattening roller 11 reciprocates along the "mouth"-shaped chute, it can rotate synchronously.

[0038] As Figure 3 As shown in the figure, the guide piece 12 is fixedly installed on the partition plate 13, the partition plate 13 is detachably installed in the impurity removal box 3, one end of the partition plate 13 coincides with one end of the sheet outlet of the impurity removal box, and the other end is close to the guide roller 14; the coverage range of the guide piece 12 is from the place close to the guide roller 14 to the through groove 9.

[0039] It is understandable that the detachable installation connection between the partition 13 and the dust removal box 3 adopts the existing technology, that is, a threaded hole is opened on the bottom wall of the dust removal box near the film outlet, and then a threaded hole is also opened at the corresponding position of the partition 13, and the partition is fixed by bolts; the bolts can be removed to pull the partition out of the dust removal box. The width of the partition 13 is consistent with the internal width of the dust removal box, which can facilitate the installation or removal of the partition in the dust removal box. When cleaning the electrode, all the cleaned debris falls on the partition 13 in the dust removal box 3. The partition 13 can be disassembled, and the debris can be taken away directly, which is convenient for cleaning the dust removal box 3.

[0040] It should be noted that when the smoothing roller 11 is located at the lower part of the “mouth”-shaped chute, the smoothing roller 11 can contact the guide piece 12 , thereby smoothing the pole piece on the guide piece 12 .

[0041] like Figure 2 As shown, a control box 16 is also installed on one side of the winding platform 2. A controller is provided in the control box 16. A control console 17 is provided on the upper portion of the control box 16. A switch push rod and various control buttons are provided on the control console 17.

[0042] Each control button on the console 17 is connected to the controller, which is in turn connected to the drive motor, various drive components, and the fan. The console can use different control buttons to issue rolling commands to the controller at different speeds, thereby controlling the start / stop, rotation rate, or extension / retraction rate of the drive motor, various drive components, and the fan, enabling the device to smooth, clean, and roll the electrode sheet. A switch push rod is connected between the controller and the distribution box, and controls the power on and off of the entire device. It should be understood that the controller here utilizes existing technology and is a specialized motion controller capable of providing more complex and high-performance motion control functions, such as Googol motion controllers and Advantech motion controllers. A specialized motion controller can control the coordination between the drive motor and various drive components based on the start / stop and speed relationships of the drive motor and various drive components to smooth, clean, and roll the electrode sheet. For example, the winding roller can rotate 10 times and then stop, then the smoothing roller can be controlled to descend toward the sheet outlet. Then, the winding roller can rotate 10 times and then stop, while the smoothing roller ascends and moves toward the sheet inlet.

[0043] Working principle:

[0044] Before the electrode is rolled, one end of the electrode on the unwinding roller is guided by one end of the traction member and driven to the sheet inlet of the dust removal box, and the other end of the traction member is fixed on the winding roller; when not rolled, the smoothing roller 11 is located at the upper part of the "mouth" shaped chute near one end of the sheet inlet 6;

[0045] The power is turned on by the switch push rod of the console 17, and the desired rolling rate instruction is issued by the control button of the console 17;

[0046] During rolling, the fan 8 blows air into the dust removal box 3, the winding roller rotates, and the pole piece enters the dust removal box through the guide roller 14. The pole piece moves to the through slot 9 under the guidance of the traction member, and the winding roller stops rotating. In this process, small particles of debris on the surface of the pole piece entering the dust removal box 3 are blown away by the wind;

[0047] Then the smoothing roller 11 falls and presses the pole piece, and moves toward the through groove 9, thereby smoothing the pole piece on the guide piece 12; at this time, the two ends of the smoothed pole piece are fixed by the guide roller 14 and the smoothing roller 11 respectively, and the surface of the pole piece is flat;

[0048] Then the smoothing roller 11 moves upwards. Since the end of the electrode through slot 9 loses its fixation, the electrode vibrates, thereby assisting in removing small particles of debris on the lower surface of the electrode under the action of blowing air.

[0049] Next, the smoothing roller 11 returns to the side close to the film inlet 6, and the winding roller rotates, and the smoothed electrode piece of this section moves toward the film outlet 7; at the same time, the next section of the electrode piece that has not been smoothed and cleaned enters between the through groove 9 and the guide roller 14;

[0050] Next, the winding roller stops rotating, and the smoothing roller 11 continues to fall and press the electrode piece, and moves toward the through slot 9, thereby smoothing this section of the electrode piece; the smoothing roller 11 continues to move upward, and this section of the electrode piece vibrates, and under the action of blowing, the debris on the upper and lower surfaces of the electrode piece is removed;

[0051] Repeat the above process, smoothing and cleaning each section of the pole piece through the smoothing roller and fan;

[0052] In the above process, when the winding roller starts or stops, the rolling roller also starts or stops synchronously.

[0053] After a roll of pole pieces is cleaned and rolled, the separator 13 is removed from the debris removal box and the debris dropped thereon is cleaned up.

[0054] In this embodiment, by providing a dust removal box, the surface of the pole piece to be rolled is cleaned before being transported to the rolling box, thereby removing hard small particles on the surface of the pole piece and reducing the situation where small particles squeeze the foil, thereby reducing the possibility of the pole piece being broken due to holes in the foil or even breakage of the foil.

[0055] A smoothing component is added to the dust removal box to change the height difference of the pole piece during transmission. It can not only smooth the wrinkles on the pole piece, but also make the pole piece vibrate, thereby assisting the fan to remove particulate matter.

[0056] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A device for rolling electrodes for lithium-ion battery processing to prevent cracking, comprising a roll box, a reeling table at the front end of the roll box, a reeling table at the rear end, a power distribution box at one side of the roll box, the reeling roller of the reeling table and the rolling rollers of the roll box being driven by respective drive motors, characterized in that: A debris removal box is provided between the roll box and the unwinding platform; The interior of the impurity removal box is hollow, and the side of the impurity removal box close to the unwinding platform is the film inlet, and a guide roller is rotatably installed in the film inlet; the other side is the film outlet; A fan is installed on the top of the impurity removal box, and through slots are opened on both side walls, and the two sides of the fan are connected to the through slots through air guide pipes; A smoothing assembly is also provided in the debris removal box. The smoothing assembly includes a smoothing roller and a guide blade. Both ends of the smoothing roller are slidably connected to the side walls of the debris removal box, and the guide blade is installed on the top of the partition.

2. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: One end of the partition coincides with the sheet outlet, and the other end is close to the guide roller; a threaded hole is provided on the bottom wall of the impurity removal box on the sheet outlet side, and a threaded hole is also provided at the corresponding position of the partition, and the partition is fixed in the impurity removal box by bolts.

3. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: The guide blade is arranged on the top of the partition between the position close to the guide roller and the through groove.

4. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: A group of "mouth" shaped chutes are respectively opened on the two side walls of the dust removal box, and the two ends of the smoothing roller are respectively installed in the "mouth" shaped chutes on the two side walls of the dust removal box; one end of the "mouth" shaped chute is close to the guide roller, and the other end is close to the through groove.

5. The anti-cracking rolling device for lithium-ion battery processing according to claim 4, characterized in that: When the smoothing roller is located at the lower part of the "mouth"-shaped chute, the smoothing roller and the guide plate can contact each other.

6. The anti-cracking rolling device for lithium-ion battery processing according to claim 4, characterized in that: Bearings are arranged at both ends of the smoothing roller, and rollers matching with the "mouth"-shaped slide groove are arranged on the outer circumference of the bearing.

7. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: A driving member is provided on the outside of one side of the debris removal box, and a protective cover is provided outside the driving member; one end of the smoothing roller close to the driving member extends out of the debris removal box and is connected to the driving member.

8. The anti-cracking rolling device for lithium-ion battery processing according to claim 7, characterized in that: The driving member adopts a cylinder assembly, which includes two cylinders, wherein the output end of cylinder one is connected to the cylinder body of cylinder two, and the output end of cylinder two is connected to the smoothing roller; or, the driving member also includes a motor, the body of the motor is connected to the output end of cylinder two, and the output end of the motor is connected to the smoothing roller.

9. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: The film outlet of the impurity removal box is connected to the two side plates of the roll box; the film inlet of the impurity removal box is connected to the two side plates of the unwinding platform on both sides, and the width of the film inlet is greater than the distance between the two side plates of the unwinding platform.

10. The anti-cracking rolling device for lithium-ion battery processing according to claim 1, characterized in that: A control box is also installed on one side of the winding table, and a controller is set in the control box, which is connected to the drive motor, various drive parts and the fan; a control console is set on the upper part of the control box, and a switch push rod and various control buttons are set on the console; each control button is connected to the controller, and the switch push rod is connected between the controller and the distribution box.

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