Cutting device, and laminating apparatus and laminating method for secondary battery including the same

Abstract

A lamination apparatus for a secondary battery according to the present application includes a lamination device having a supply unit that supplies an electrode disposed with a gap set on at least one separator sheet and a bonding unit that bonds the separator sheet and the electrode that have passed through the supply unit to manufacture a basic unit sheet, and a cutting device that cuts the separator sheet of the basic unit sheet that has passed through the lamination device to manufacture a basic unit composed of a separator and an electrode. The cutting device includes a transfer conveyor that transfers the basic unit sheet, a laser cutting unit that irradiates a laser onto the separator sheet of the basic unit sheet so that the separator sheet is cut to manufacture the basic unit, a discharge conveyor that transfers the basic unit cut by the laser cutting unit, and an adjustment unit that adjusts a speed at which the separator sheet is cut by the laser cutting unit according to a distance between the transfer conveyor and the discharge conveyor.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0003616, filed on January 11, 2021, and Korean Patent Application No. 10-2022-0003013, filed on January 7, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a cutting device, and a lamination apparatus and lamination method for secondary batteries including the cutting device, and more specifically, to a cutting device that can improve the cutting quality of a separator, and a lamination apparatus and lamination method for secondary batteries including the cutting device. Background Technology

[0004] Generally speaking, unlike primary batteries which are non-rechargeable, secondary batteries are rechargeable and dischargeable batteries, which are widely used in high-tech electronic devices such as mobile phones, laptops, and cameras.

[0005] Secondary batteries are classified into can-type secondary batteries with electrode assemblies built into a metal can and pouch-type secondary batteries with electrode assemblies built into a pouch. Pouch-type secondary batteries include electrode assemblies, electrolyte, and a pouch containing the electrode assemblies and electrolyte. In the electrode assembly, the positive and negative electrodes are arranged with a diaphragm between them. Electrode contacts are attached to the positive and negative electrodes, respectively. Electrode leads are connected to each electrode contact.

[0006] A lamination process is performed on the secondary battery to improve the adhesion of the electrode assembly with stacked positive electrode, separator and negative electrode.

[0007] In other words, the lamination process includes: supplying electrodes and diaphragm sheets; arranging multiple electrodes along the length of the diaphragm sheets; pressure bonding the electrodes and diaphragm sheets; cutting the diaphragm sheets between corresponding electrodes using a molding tool to manufacture basic units having electrodes and diaphragms; and stacking at least one basic unit to complete the electrode assembly.

[0008] However, since the cutting in the lamination process is usually performed with the molding tool in physical contact with the diaphragm, there are problems such as the diaphragm bending or being pushed away. Summary of the Invention

[0009] Technical issues

[0010] To address this problem, the present invention aims to provide a cutting device and a lamination apparatus and method for secondary batteries including the cutting device. This cutting device cuts the separator sheet by applying a laser cutting unit without physical contact with the separator sheet, thereby preventing defects such as bending or pushing of the separator sheet, and in particular, improving cutting quality and cutting accuracy.

[0011] Technical solution

[0012] To achieve this objective, the lamination apparatus for secondary batteries according to the present invention comprises: a lamination device having a supply unit and a bonding unit, the supply unit supplying at least one separator sheet and electrodes disposed on the at least one separator sheet at a set gap, the bonding unit bonding the separator sheet and the electrodes passing through the supply unit to manufacture a basic unit sheet; and a cutting device cutting the separator sheet of the basic unit sheet passing through the lamination device to manufacture a basic unit composed of a separator and the electrodes. The cutting apparatus may include: a conveyor that conveys the basic unit sheet through the laminating apparatus; a laser cutting unit that irradiates a diaphragm sheet of the basic unit sheet passing through the conveyor with a laser, such that the diaphragm sheet is cut by irradiating it from one end to the other in the width direction of the diaphragm sheet to manufacture the basic unit; an unloading conveyor configured to be separate from the conveyor and convey the basic unit sheet cut by the laser cutting unit; and an adjustment unit that adjusts the speed at which the diaphragm sheet is cut by the laser cutting unit according to the distance between the conveyor and the unloading conveyor.

[0013] When the distance between the conveyor and the unloading conveyor increases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to decrease; and when the distance between the conveyor and the unloading conveyor decreases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to increase.

[0014] The adjustment unit can further adjust the speed at which the diaphragm is cut by the laser cutting unit according to the moving speed of the conveyor. When the moving speed of the conveyor increases, the adjustment unit can also adjust the speed at which the diaphragm is cut by the laser cutting unit to increase, and when the moving speed of the conveyor decreases, the adjustment unit can also adjust the speed at which the diaphragm is cut by the laser cutting unit to decrease.

[0015] The adjustment unit can further adjust the speed at which the diaphragm is cut by the laser cutting unit according to the processing speed of the laminating apparatus to manufacture the basic unit. When the processing speed of the laminating apparatus increases, the adjustment unit can also adjust the speed at which the diaphragm is cut by the laser cutting unit to increase, and when the processing speed of the laminating apparatus decreases, the adjustment unit can also adjust the speed at which the diaphragm is cut by the laser cutting unit to decrease.

[0016] The unloading conveyor may have a set speed that is faster than the set speed of the conveying conveyor.

[0017] The cutting device may further include a suction unit that suctions and removes foreign matter or dust generated when the laser cutting unit cuts the diaphragm. The suction unit may include: a lower suction section disposed between the conveyor and the unloading conveyor, which suctions and removes foreign matter and / or dust appearing below the diaphragm when the diaphragm is cut; and an upper suction section disposed above the unloading conveyor, which suctions and removes foreign matter or dust present on the surface of the basic unit conveyed by the unloading conveyor.

[0018] The lamination method for a secondary battery according to the present invention includes: a lamination operation comprising a supply step and a bonding step, wherein the supply step supplies at least one separator sheet and supplies electrodes disposed on the at least one separator sheet at a set gap, and the bonding step, after the supply step, bonds the separator sheet and the electrodes to manufacture a basic unit sheet; and a cutting operation, after the lamination operation, cutting the separator sheet of the basic unit sheet to manufacture a basic unit composed of a separator and the electrodes. The cutting operation may include: a conveying step, after the lamination operation, conveying the basic unit sheet via a conveyor; a laser cutting step, wherein a laser is irradiated onto the separator sheet of the basic unit sheet by a laser cutting unit, such that the separator sheet is cut by irradiation from one end to the other in the width direction of the separator sheet to manufacture the basic unit; and an unloading step, conveying the basic unit cut by the laser cutting unit via an unloading conveyor. The cutting operation may further include an adjustment step, wherein the speed at which the separator sheet is cut by the laser cutting unit is adjusted by an adjustment unit according to the distance between the conveyor and the unloading conveyor.

[0019] In the adjustment process, when the distance between the conveying conveyor and the unloading conveyor increases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to decrease, and when the distance between the conveying conveyor and the unloading conveyor decreases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to increase.

[0020] In the adjustment process, the speed at which the diaphragm is cut by the laser cutting unit can be further adjusted according to the moving speed of the conveyor. Specifically, when the speed of the conveyor increases, the adjustment unit can also increase the speed at which the diaphragm is cut by the laser cutting unit; conversely, when the speed of the conveyor decreases, the adjustment unit can also decrease the speed at which the diaphragm is cut by the laser cutting unit.

[0021] In the adjustment process, the speed at which the diaphragm sheet is cut by the laser cutting unit can be further adjusted according to the processing speed of the lamination operation used to manufacture the basic unit sheet. In the adjustment process, when the processing speed of the lamination operation increases, the adjustment unit can also increase the speed at which the diaphragm sheet is cut by the laser cutting unit; conversely, when the processing speed of the lamination operation decreases, the adjustment unit can also decrease the speed at which the diaphragm sheet is cut by the laser cutting unit.

[0022] In the adjustment process, the unloading conveyor can be adjusted to move at a set speed that is faster than the set speed of the conveying conveyor.

[0023] The lamination method may further include a suction operation after the cutting operation, which suctions and removes foreign matter or dust generated when the diaphragm is cut.

[0024] The suction operation may include: a lower suction step, in which foreign objects and / or dust appearing below the diaphragm are suctioned and removed by the lower suction part when the laser cutting unit cuts the diaphragm; and an upper suction step, in which foreign objects or dust present on the top surface of the basic unit being conveyed by the unloading conveyor are suctioned and removed by the upper suction part.

[0025] According to the present invention, a cutting apparatus for cutting a secondary battery basic unit sheet, the basic unit sheet comprising at least one separator sheet and electrodes disposed on the at least one separator sheet at a predetermined gap, the cutting apparatus may include: a conveyor configured to convey the basic unit sheet; a laser cutting unit that irradiates the separator sheet of the basic unit sheet passing through the conveyor with a laser, such that the separator sheet is cut by irradiation from one end to the other in the width direction of the separator sheet to manufacture a basic unit; an unloading conveyor separate from the conveyor and configured to convey the basic unit cut by the laser cutting unit; and an adjustment unit that adjusts the speed at which the separator sheet is cut by the laser cutting unit according to the distance between the conveyor and the unloading conveyor.

[0026] When the distance between the conveyor and the unloading conveyor increases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to decrease; and when the distance between the conveyor and the unloading conveyor decreases, the adjustment unit can adjust the speed at which the diaphragm is cut by the laser cutting unit to increase.

[0027] Beneficial effects

[0028] The lamination apparatus for secondary batteries according to the present invention includes a lamination device and a cutting device, and is characterized in that the cutting device includes a conveyor, a laser cutting unit, a discharge conveyor, and an adjustment unit. Due to these features, defects such as bending or detachment of the diaphragm can be prevented. In particular, the speed at which the diaphragm is cut by the laser cutting unit can be adjusted according to the distance between the conveyor and the discharge conveyor. As a result, the cutting accuracy and quality of the diaphragm can be improved. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the process of a lamination apparatus for secondary batteries according to a first embodiment of the present invention.

[0030] Figure 2 This is a side view illustrating the cutting device of a laminating apparatus for secondary batteries according to a first embodiment of the present invention.

[0031] Figure 3 This is a side view illustrating the laser cutting unit set up in the cutting device.

[0032] Figure 4 This is a side view of a 3D scanner illustrating a laser cutting unit.

[0033] Figure 5It is a perspective view illustrating the cutting state of a laser cutting unit set in a cutting device.

[0034] Figure 6 This is a flowchart illustrating a lamination method for a secondary battery according to a first embodiment of the present invention.

[0035] Figure 7 This is a side view illustrating a cutting device according to a second embodiment of the present invention.

[0036] Figure 8 This is a table representing the experimental results of the present invention. Detailed Implementation

[0037] Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the invention. However, the invention may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. For clarity of description with reference to the accompanying drawings, portions irrelevant to the description will be excluded. Throughout the application, the same reference numerals denote the same elements.

[0038] [Lamination apparatus for secondary batteries according to a first embodiment of the present invention]

[0039] like Figures 1 to 5 As shown, the lamination apparatus for secondary batteries according to the first embodiment of the present invention includes a lamination apparatus 100 and a cutting apparatus 200. The lamination apparatus 100 manufactures basic unit sheets 10, and the cutting apparatus 200 cuts the basic unit sheets 10 manufactured by the lamination apparatus 100 to manufacture basic units 20.

[0040] Lamination device

[0041] The laminating apparatus 100 includes a supply unit 110 and a bonding unit 120. The supply unit 110 supplies at least one diaphragm sheet and electrodes disposed separately on the at least one diaphragm sheet with a set gap. The bonding unit 120 bonds the diaphragm sheet and electrodes that have passed through the supply unit 110 to manufacture a basic unit sheet 10.

[0042] The supply unit 110 includes a diaphragm supply roller 111 and an electrode supply roller. The diaphragm supply roller 111 supplies at least one diaphragm 11, and the electrode supply roller supplies electrodes to be sequentially arranged along the total length of the diaphragm 11.

[0043] The electrodes include a first electrode 12 and a second electrode 13. The electrode supply rollers include a first electrode supply roller 112 and a second electrode supply roller 113. The first electrode supply roller 112 supplies the first electrode 12 to be disposed on one side of the diaphragm 11, and the second electrode supply roller 113 supplies the second electrode 13 to be disposed on the other side of the diaphragm 11. The first electrode 12 can be a positive electrode, and the second electrode 13 can be a negative electrode, or vice versa.

[0044] The first electrode supply roller 112 cuts an elongated first electrode sheet using a first cutter 114 to produce a first electrode 12, and then places the first electrode 12 on one side of the diaphragm sheet 11. The second electrode supply roller 113 cuts an elongated second electrode sheet using a second cutter 115 to produce a second electrode 13, and then places the second electrode 13 on the other side of the diaphragm sheet 11.

[0045] For example, such as Figure 1 As shown, the supply unit 110 supplies a pair of diaphragms 11 via a diaphragm supply roller 111, continuously supplies a first electrode 12 via a first electrode supply roller 112 to place the first electrode 12 between the pair of diaphragms 11, and continuously supplies a second electrode 13 via a second electrode supply roller 113 to respectively place it on the outer surface of the pair of diaphragms 11. Therefore, a laminate in which the second electrode 13, diaphragm 11, first electrode 12, diaphragm 11, and second electrode 13 are arranged in a vertical direction can be manufactured.

[0046] The bonding unit 120 is used to bond the diaphragm sheet and electrode that have passed through the supply unit 110 to manufacture the basic unit sheet 10. That is, the bonding unit 120 includes a laminator 121 and a pressing roller 122, the laminator 121 heating the diaphragm sheet and electrode, and the pressing roller 122 pressing and bonding the diaphragm sheet and electrode.

[0047] In one example, bonding unit 120 heats the laminate, which includes a second electrode 13, a diaphragm sheet 11, a first electrode 12, a diaphragm sheet 11, and a second electrode 13, after passing through supply unit 110 using laminator 121, and then presses the bonding laminate using pressing roller 122. Thus, a basic unit sheet 10 having a five-layer structure including a second electrode 13, a diaphragm sheet 11, a first electrode 12, a diaphragm sheet 11, and a second electrode 13 can be manufactured.

[0048] Cutting device

[0049] The cutting device 200 is used to cut the basic unit sheet 10 to manufacture the basic unit 20. That is, the cutting device 200 includes: a conveyor 210 that conveys the basic unit sheet 10 through the laminating device 100; and a laser cutting unit 220 that irradiates a diaphragm sheet 11 of the basic unit sheet 10 passing through the conveyor 210 with a laser, and cuts the diaphragm sheet 10 along its entire width direction (e.g., ...). Figure 5 As shown, the diaphragm 11 is cut from one end to the other by irradiation in a vertical direction (perpendicular to the direction of movement of the diaphragm) to manufacture the basic unit 20; and the unloading conveyor 230 is configured to be separate from the conveying conveyor 210 and to convey the basic unit 20 cut by the laser cutting unit 220.

[0050] In other words, as the diaphragm sheet 11 of the basic unit sheet 10, conveyed by the conveyor 210, passes between the conveyor 210 and the unloading conveyor 230, the cutting device 200 cuts the diaphragm sheet 11 across its entire width using a laser irradiated from the laser cutting unit 220 to manufacture the basic unit 20. Therefore, the laser cutting unit 220 cuts the corresponding electrodes and the diaphragm sheets 11 between the electrodes to manufacture the basic unit 20 composed of diaphragms and electrodes. Afterwards, the basic unit 20 cut by the laser cutting unit 220 is conveyed to a designated position via the unloading conveyor 230.

[0051] The laser cutting unit 220 includes: a laser generator 221 that generates a laser beam; a lens 222 that adjusts the focus of the laser beam generated from the laser generator 221; a first reflector and a second reflector 223 that reflect the laser beam passing through the lens 222 to irradiate the diaphragm 11 of the basic unit sheet 10; and an F-θ (F-THETA) lens 224 that minimizes the distortion of the center and the outside of the laser beam irradiating the diaphragm of the basic unit sheet, such that the center and the outside of the laser beam irradiating the diaphragm are focused at the same position.

[0052] More specifically, in such Figure 3 In the laser cutting unit 220 shown, when the laser generator 221 generates a laser beam, the focus is adjusted while the laser beam generated from the laser generator 221 passes through the lens 222, and the laser beam irradiates the diaphragm of the basic unit sheet while being reflected by the first reflector and the second reflector 223. When... Figure 4 As shown, when the tilt angle of the second reflector 223 is adjusted in the width direction of the diaphragm 11, the laser beam reflected by the second reflector 223 moves from one end to the other in the width direction of the diaphragm 11 while cutting the diaphragm 11, as shown. Figure 5As shown in the diagram, increasing the speed at which the tilt angle of the second reflector 223 is adjusted increases the speed at which the diaphragm 11 is cut. Conversely, decreasing the speed at which the tilt angle of the second reflector 223 is adjusted decreases the speed at which the diaphragm 11 is cut. In other words, the speed at which the diaphragm 11 is cut can be adjusted via the second reflector 223.

[0053] The laser cutting unit includes gun-type and scanner-type units. Preferably, refer to... Figure 4 A scanner-type laser cutting unit that can effectively adapt to the cutting speed is used. In one example, a 3D scanner is used as the laser cutting unit to match the diaphragm cutting speed and cutting width.

[0054] The cutting device 200 with this configuration includes a laser cutting unit 220, which enables the diaphragm sheet to be cut effectively by a non-contact laser, thus preventing defects such as bending or pushing of the diaphragm.

[0055] The lamination apparatus for secondary batteries according to a first embodiment of the present invention further includes: a suction unit 250 for suctioning foreign matter and dust generated during the cutting of the separator sheet. The suction unit 250 is disposed between a conveying conveyor 210 and a discharge conveyor 230. The conveying conveyor 210 and the discharge conveyor 230 have a distance α to accommodate the suction unit 250.

[0056] When the gap α between the conveyor 210 and the unloading conveyor 230 increases excessively, defects may occur when the diaphragm is cut, as the cut surface of the diaphragm 11 bends toward the space between the conveyor 210 and the unloading conveyor 230.

[0057] The spacing α refers to the straight-line distance between the ends of the corresponding conveyor 210 and the ends of the unloading conveyor 230.

[0058] To address this issue, when the distance α between the conveyor 210 and the unloading conveyor 230 increases, the laminating apparatus for secondary batteries according to the first embodiment of the present invention increases the time for complete cutting of the diaphragm by reducing the cutting speed of the laser cutting unit, so that the cut surface of the diaphragm can be guided to be stably placed on the unloading conveyor 230 without bending toward the space between the conveyor 210 and the unloading conveyor 230.

[0059] In one example, the cutting device 200 may include an adjustment unit 240 that adjusts the speed at which the diaphragm 11 is cut by the laser cutting unit 220 according to the distance between the conveyor 210 and the unloading conveyor 230.

[0060] That is to say, refer to Figure 8 According to the table, when the distance between the conveyor 210 and the unloading conveyor 230 increases, the adjustment unit 240 adjusts the speed at which the laser cutting unit 220 cuts the diaphragm 11 to decrease; when the distance between the conveyor 210 and the unloading conveyor 230 decreases, the adjustment unit 240 adjusts the speed at which the laser cutting unit 220 cuts the diaphragm 11 to increase.

[0061] Therefore, the adjustment unit 240 can adjust the time to completely cut the diaphragm 11 by adjusting the cutting speed of the laser cutting unit 220. This prevents the cut surface of the diaphragm 11 from bending between the conveyor 210 and the unloading conveyor 230.

[0062] Figure 8 This is a table representing the cutting speed of the laser cutting unit.

[0063] exist Figure 8 In this context, the processing speed is the speed at which the laminating device manufactures basic unit sheets, the moving speed is the speed at which the conveyor 210 transports the basic unit sheets, and the laser cutting unit speed is the speed at which the laser cutting unit cuts the diaphragm sheets.

[0064] In the first experimental example, refer to Figure 8 According to the table, when the processing speed is approximately 80 cpm and the moving speed is approximately 135 mm / s, and the distance between the conveyor 210 and the unloading conveyor 230 is approximately 10 mm, the laser cutting unit cuts the diaphragm 11 at a speed of approximately 8.1 m / s. Furthermore, when only the distance between the conveyor 210 and the unloading conveyor 230 increases to approximately 50 mm, the laser cutting unit cuts the diaphragm at a speed of approximately 1.6 m / s. That is, it can be seen that as the distance between the conveyor 210 and the unloading conveyor 230 gradually increases, the cutting speed of the laser cutting unit gradually decreases. This is to delay the cutting speed of the diaphragm to prevent the cut surface of the diaphragm from bending between the conveyor 210 and the unloading conveyor 230.

[0065] The adjustment unit 240 can adjust the cutting speed of the laser cutting unit 220 according to the moving speed of the basic unit piece 10 via the conveyor 210.

[0066] That is, when the moving speed of the conveyor 21 increases, the adjustment unit 240 will also adjust the speed at which the laser cutting unit 220 cuts the diaphragm 11 to increase; when the moving speed of the conveyor 21 decreases, the adjustment unit 240 will also adjust the speed at which the laser cutting unit 220 cuts the diaphragm 11 to decrease.

[0067] In the second experimental example, refer to Figure 8 According to the table, when the processing speed is approximately 80 cpm and the distance between the conveyor 210 and the unloading conveyor 230 is approximately 10 mm, and the moving speed is approximately 135 mm / s, the laser cutting unit 220 cuts the diaphragm sheet 11 at a speed of approximately 8.1 m / s. Furthermore, when the moving speed is increased only to approximately 506 mm / s, the laser cutting unit 220 cuts the diaphragm sheet at a speed of approximately 30.3 m / s. That is to say, it can be seen that as the moving speed increases, the cutting speed of the laser cutting unit 220 also increases.

[0068] Here, when the distance between the conveyor 210 and the unloading conveyor 230 increases to about 50 mm, the adjustment unit 240 can adjust the cutting speed of the laser cutting unit 220 to reduce it to about 6.1 m / s.

[0069] The adjustment unit 240 can adjust the speed at which the diaphragm sheet is cut by the laser cutting unit according to the processing speed of the laminating device to manufacture the basic unit sheet 10.

[0070] That is, when the processing speed of the laminating device 100 increases, the adjusting unit 240 adjusts the speed at which the laser cutting unit 220 cuts the diaphragm to increase as well; when the processing speed of the laminating device 100 decreases, the adjusting unit 240 adjusts the cutting speed of the laser cutting unit to decrease as well.

[0071] In the third experimental example, refer to Figure 8 According to the table, when the processing speed is approximately 80 cpm, the moving speed is approximately 135 mm / s, and the distance between the conveyor 210 and the unloading conveyor 230 is approximately 10 mm, the laser cutting unit 220 cuts the diaphragm 11 at a speed of approximately 8.1 m / s. Furthermore, when the processing speed is increased only to approximately 300 cpm, the laser cutting unit 220 cuts the diaphragm 11 at a speed of approximately 30.3 m / s. That is to say, it can be seen that as the processing speed increases, the cutting speed of the laser cutting unit 220 also increases.

[0072] The unloading conveyor 230 has a faster conveying speed than the conveying conveyor 210. In one example, the unloading conveyor 230 has a conveying speed that is approximately 3-7 mm / s faster, preferably approximately 5 mm / s faster, than the conveying conveyor 210. Therefore, the basic units cut by the laser cutting unit can be conveyed quickly via the unloading conveyor 230 without delay compared to the basic unit sheets conveyed by the conveying conveyor 210.

[0073] Therefore, according to the first embodiment of the present invention, the lamination equipment for secondary batteries can more accurately cut the diaphragm sheet by adjusting the cutting speed of the laser cutting unit according to the distance between the conveyor 210 and the unloading conveyor 230, the moving speed of the basic unit sheet, or the processing speed of the lamination device.

[0074] The suction unit 250 includes: a lower suction section 251 disposed between the conveyor 210 and the unloading conveyor 230, which suctions and removes foreign matter and / or dust appearing below the diaphragm 11 when the laser cutting unit 220 cuts the diaphragm 11; and an upper suction section 252 disposed above the unloading conveyor 230, which suctions and removes foreign matter or dust present on the top surface of the basic unit 20 conveyed by the unloading conveyor 230.

[0075] Therefore, when the diaphragm 11 is cut, the suction unit 250 can effectively suction and remove foreign objects or dust that appear below and above the diaphragm 11.

[0076] The following describes a lamination method using a lamination apparatus for secondary batteries according to a first embodiment of the present invention.

[0077] [Lamination method for secondary batteries according to a first embodiment of the present invention]

[0078] like Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, the lamination method for a secondary battery according to the first embodiment of the present invention includes: a lamination operation (S10) to manufacture a basic unit sheet 10; and a cutting operation (S20) to cut the separator sheet 11 of the basic unit sheet 10 to manufacture a basic unit 20 including a separator and an electrode.

[0079] The lamination operation (S10) includes a supply step and a bonding step. The supply step supplies at least one diaphragm sheet and an electrode to be disposed along the total length direction of at least one diaphragm sheet 11. The bonding step combines the diaphragm sheet 11 and the electrode after the supply step to manufacture a basic unit sheet 10.

[0080] The cutting operation (S20) includes: a conveying process, in which the basic unit sheet 10 is conveyed by a conveyor 210 after the lamination operation; a laser cutting process, in which a laser beam is irradiated onto the diaphragm sheet 11 of the basic unit sheet 10 by a laser cutting unit 220, such that the diaphragm sheet 11 is cut from one end to the other in the width direction to manufacture the basic unit 20; and an unloading process, in which the basic unit 20 cut by the laser cutting unit 220 is conveyed by an unloading conveyor 230.

[0081] That is to say, refer to Figure 3 and Figure 4 In the laser cutting unit 220, when the laser generator 221 generates a laser beam, the focus is adjusted while the laser beam passes through the lens 222, and the laser beam irradiates the diaphragm 11 of the basic unit sheet 10 while being reflected by the first reflector and the second reflector 223. When the tilt angle of the second reflector 223 is adjusted in the width direction of the diaphragm 11, the laser beam reflected by the second reflector 223 moves from one end to the other in the width direction of the diaphragm 11 while cutting the diaphragm 11.

[0082] The cutting operation further includes an adjustment process to adjust the speed at which the diaphragm 11 is cut by the laser cutting unit 220 according to the distance between the conveyor 210 and the unloading conveyor 230. Here, the adjustment unit 240 is used.

[0083] That is, during the adjustment process, when the distance between the conveyor 210 and the unloading conveyor 230 increases, the adjustment unit 240 adjusts the moving speed of the laser cutting unit 220 to decrease, and when the distance between the conveyor 210 and the unloading conveyor 230 decreases, the adjustment unit 240 adjusts the moving speed of the laser cutting unit 220 to increase.

[0084] Furthermore, during the adjustment process, the speed at which the diaphragm 11 is cut by the laser cutting unit 220 can be further adjusted according to the moving speed of the conveyor 210. That is, during the adjustment process, when the moving speed of the conveyor 210 increases, the adjustment unit 240 can also adjust the speed at which the diaphragm is cut by the laser cutting unit 220 to increase; when the speed of the conveyor 210 decreases, the adjustment unit 240 can also adjust the speed at which the diaphragm is cut by the laser cutting unit 220 to decrease.

[0085] Furthermore, during the adjustment process, the speed at which the diaphragm sheet is cut by the laser cutting unit 220 can be further adjusted according to the processing speed of the lamination operation to manufacture the basic unit sheet 10. That is, during the adjustment process, when the processing speed of the lamination operation increases, the adjustment unit 240 can adjust the speed at which the diaphragm sheet is cut by the laser cutting unit 220 to increase accordingly; when the processing speed of the lamination operation decreases, the adjustment unit 240 can adjust the speed at which the diaphragm sheet is cut by the laser cutting unit 220 to decrease accordingly.

[0086] During the adjustment process, the unloading conveyor can be adjusted to move at a faster speed than the transmission conveyor.

[0087] The lamination method may further include a suction operation after the cutting operation, wherein the suction operation uses a suction unit 250 to suction and remove foreign matter or dust generated during the cutting of the diaphragm sheet. The suction unit 250 includes a lower suction section 251 and an upper suction section 252.

[0088] The suction operation includes: a first suction operation, in which foreign objects and / or dust appearing below the diaphragm 11 are suctioned and removed by the lower suction part 251 when the laser cutting unit 220 cuts the diaphragm; and a second suction operation, in which foreign objects or dust present on the top surface of the basic unit 20 conveyed by the unloading conveyor 230 are suctioned and removed by the upper suction part 252.

[0089] When the operations described above are completed, the basic unit 20 of the finished product can be manufactured.

[0090] In the following description, another embodiment of the present invention will be described using the same reference numerals for elements having the same function as those in the above embodiments, and repeated descriptions will be omitted.

[0091] [Cutting apparatus according to a second embodiment of the present invention]

[0092] The cutting device for the lamination equipment for secondary batteries according to the first embodiment of the present invention can be manufactured as a separate product.

[0093] like Figure 7 As shown, the cutting apparatus 200 according to the second embodiment of the present invention may include: a conveyor 210 for conveying basic unit sheets 10; a laser cutting unit 220 for cutting diaphragm sheets 11 of the basic unit sheets 10 passing through the conveyor 210 to manufacture basic units 20; an unloading conveyor 230 configured to be separate from the conveyor 210 and for conveying the basic units cut by the laser cutting unit 220; and an adjustment unit 240 for adjusting the speed at which the laser cutting unit cuts the diaphragm sheets according to the distance between the conveyor 210 and the unloading conveyor 230.

[0094] The scope of this invention is defined by the appended claims rather than the foregoing detailed description. Various modifications made within the scope of the claims, and in the equivalent sense of their meaning, should be considered within the scope of this invention.

[0095] [Label Explanation]

[0096] 10: Basic unit piece

[0097] 11: Diaphragm

[0098] 12: First electrode

[0099] 13: Second electrode

[0100] 20: Basic Unit

[0101] 100: Lamination device

[0102] 110: Supply Unit

[0103] 111: Diaphragm supply roller

[0104] 112: First electrode supply roller

[0105] 113: Second electrode supply roller

[0106] 114: First Cutter

[0107] 115: Second cutter; 120: Joining unit

[0108] 121: Laminator

[0109] 122: Pressing roller; 200: Cutting device

[0110] 210: Conveyor

[0111] 220: Laser cutting unit

[0112] 221: Laser Generator

[0113] 222: Lens

[0114] 223: Second reflector

[0115] 224: F-θ (F-THETA) lens

[0116] 230: Unloading Conveyor

[0117] 240: Adjustment unit

[0118] 250: Suction Unit

[0119] 251: Lower suction section

[0120] 252: Upper suction section.

Claims

1. A laminating apparatus for secondary batteries, the laminating apparatus comprising: A laminating apparatus having a supply unit and a bonding unit, the supply unit being configured to supply at least one diaphragm sheet and an electrode disposed on the at least one diaphragm sheet at a set gap, and the bonding unit being configured to bond the diaphragm sheet and the electrode, which have passed through the supply unit, to manufacture a basic unit sheet. as well as A cutting device configured to cut the diaphragm sheet of the basic unit sheet passed through the laminating device to manufacture a basic unit consisting of a diaphragm and the electrode. The cutting device includes: A conveyor configured to convey the basic unit sheet through the laminating device; A laser cutting unit is configured to irradiate a laser onto the diaphragm sheet of the basic unit sheet passing through the conveyor, wherein the diaphragm sheet is cut by irradiating it from one end to the other in the width direction of the diaphragm sheet to manufacture the basic unit. An unloading conveyor, configured to be separate from the conveying conveyor and adapted to convey the basic units cut by the laser cutting unit; and An adjustment unit is configured to adjust the speed at which the laser cutting unit cuts the diaphragm sheet based on the distance between the conveyor and the unloading conveyor. The distance between the conveyor and the unloading conveyor refers to the straight-line distance between the ends of the conveyor and the unloading conveyor. The adjustment unit adjusts the time required to completely cut the diaphragm by adjusting the cutting speed of the laser cutting unit.

2. The laminating apparatus according to claim 1, wherein when the distance between the conveyor and the unloading conveyor increases, the adjusting unit adjusts the speed at which the diaphragm is cut by the laser cutting unit to decrease, and When the distance between the conveyor and the unloading conveyor decreases, the adjustment unit increases the speed at which the laser cutting unit cuts the diaphragm.

3. The lamination apparatus according to claim 1, wherein the adjusting unit further adjusts the speed at which the diaphragm is cut by the laser cutting unit according to the moving speed of the conveyor. When the moving speed of the conveyor increases, the adjustment unit also adjusts the speed at which the laser cutting unit cuts the diaphragm to increase accordingly. When the moving speed of the conveyor decreases, the adjustment unit also adjusts the speed at which the laser cutting unit cuts the diaphragm to decrease.

4. The lamination apparatus according to claim 3, wherein the adjusting unit further adjusts the speed at which the diaphragm is cut by the laser cutting unit according to the processing speed of the lamination apparatus to manufacture the basic unit. When the processing speed of the laminating device increases, the adjusting unit also increases the speed at which the laser cutting unit cuts the diaphragm sheet. When the processing speed of the laminating device decreases, the adjustment unit will also adjust the speed at which the laser cutting unit cuts the diaphragm to decrease.

5. The laminating apparatus according to claim 1, wherein the unloading conveyor has a set speed that is faster than the set speed of the conveying conveyor.

6. The lamination apparatus of claim 1, wherein the cutting device further comprises a suction unit configured to suction and remove foreign matter or dust generated when the laser cutting unit cuts the diaphragm sheet. The suction unit includes: A lower suction unit is disposed between the conveying conveyor and the unloading conveyor, and is configured to suction and remove foreign matter and / or dust that appears below the diaphragm when the diaphragm is cut; and An upper suction unit is disposed above the unloading conveyor and configured to suction and remove foreign matter or dust present on the surface of the basic unit conveyed by the unloading conveyor.

7. A lamination method for a secondary battery, the lamination method comprising: A lamination operation, the lamination operation including a supply step and a bonding step, wherein the supply step supplies at least one diaphragm sheet and supplies electrodes disposed on the at least one diaphragm sheet with a set gap, and the bonding step after the supply step bonds the diaphragm sheet and the electrodes to manufacture a basic unit sheet; as well as A cutting operation is performed after the lamination operation to cut the diaphragm sheet of the basic unit sheet to manufacture a basic unit consisting of a diaphragm and the electrode. The cutting operation includes: The basic unit sheet is conveyed via a conveyor after the lamination operation. The laser cutting process involves using a laser cutting unit to irradiate the diaphragm sheet of the basic unit sheet with a laser, thereby cutting the diaphragm sheet by irradiating it from one end to the other in the width direction to manufacture the basic unit; and In the unloading process, the basic units cut by the laser cutting unit are conveyed by an unloading conveyor. The cutting operation further includes an adjustment step, wherein the speed at which the laser cutting unit cuts the diaphragm sheet is adjusted according to the distance between the conveyor and the unloading conveyor via an adjustment unit. The distance between the conveyor and the unloading conveyor refers to the straight-line distance between the ends of the conveyor and the unloading conveyor. The adjustment unit adjusts the time required to completely cut the diaphragm by adjusting the cutting speed of the laser cutting unit.

8. The lamination method according to claim 7, wherein in the adjustment step, when the distance between the conveyor and the unloading conveyor increases, the adjustment unit adjusts the speed at which the diaphragm is cut by the laser cutting unit to decrease, and When the distance between the conveyor and the unloading conveyor decreases, the adjustment unit increases the speed at which the laser cutting unit cuts the diaphragm.

9. The lamination method according to claim 8, wherein in the adjustment step, the speed at which the diaphragm is cut by the laser cutting unit is further adjusted according to the moving speed of the conveyor. In the adjustment process, when the speed of the conveyor increases, the adjustment unit also adjusts the speed at which the laser cutting unit cuts the diaphragm to increase. When the moving speed of the conveyor decreases, the adjustment unit also adjusts the speed at which the laser cutting unit cuts the diaphragm to decrease.

10. The lamination method according to claim 9, wherein in the adjustment step, the speed at which the diaphragm sheet is cut by the laser cutting unit is further adjusted according to the processing speed of the lamination operation used to manufacture the basic unit sheet. In the adjustment process, when the processing speed of the lamination operation increases, the adjustment unit also increases the speed at which the laser cutting unit cuts the diaphragm. When the processing speed of the lamination operation is reduced, the adjustment unit will also reduce the speed at which the laser cutting unit cuts the diaphragm.

11. The lamination method according to claim 8, wherein in the adjustment step, the unloading conveyor is adjusted to move at a set speed faster than the set speed of the conveying conveyor.

12. The lamination method according to claim 8, further comprising a suction operation after the cutting operation, the suction operation suctioning and removing foreign matter or dust generated when the diaphragm sheet is cut.

13. The lamination method according to claim 12, wherein the suction operation comprises: In the lower suction process, when the laser cutting unit cuts the diaphragm, the lower suction unit sucks up and removes foreign objects and / or dust appearing below the diaphragm; and The upper suction process uses an upper suction unit to suction and remove foreign objects or dust present on the top surface of the basic unit being conveyed by the unloading conveyor.

14. A cutting apparatus for cutting a basic unit sheet, the basic unit sheet comprising at least one diaphragm sheet and electrodes disposed on the at least one diaphragm sheet at a predetermined gap, the cutting apparatus comprising: A conveyor configured to convey the basic unit piece; A laser cutting unit is configured to irradiate a laser onto the diaphragm sheet of the basic unit sheet passing through the conveyor, such that the diaphragm sheet is cut by irradiating it from one end to the other in the width direction of the diaphragm sheet to manufacture the basic unit. An unloading conveyor, configured to be separate from the conveying conveyor and configured to convey the basic unit cut by the laser cutting unit; as well as An adjustment unit is configured to adjust the speed at which the laser cutting unit cuts the diaphragm sheet based on the distance between the conveyor and the unloading conveyor. The distance between the conveyor and the unloading conveyor refers to the straight-line distance between the ends of the conveyor and the unloading conveyor. The adjustment unit adjusts the time required to completely cut the diaphragm by adjusting the cutting speed of the laser cutting unit.

15. The cutting apparatus of claim 14, wherein when the distance between the conveyor and the unloading conveyor increases, the adjusting unit adjusts the speed at which the diaphragm is cut by the laser cutting unit to decrease, and When the distance between the conveyor and the unloading conveyor decreases, the adjustment unit increases the speed at which the laser cutting unit cuts the diaphragm.

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