KR20130105001A - Electrode manufacturing device of novel structure - Google Patents

Abstract

PURPOSE: An electrode manufacturing device is provided to easily control tension while easily processing an electrode sheet in real time and to obtain excellent electrode processing efficiency. CONSTITUTION: An electrode manufacturing device (100) comprises an unwinder (110) in which an electrode sheet (10) is winded; a skewing-correcting part (120) monitoring and correcting the location of an electrode sheet; a splice part which connects a new electrode sheet after all of the electrode sheets are winded; a scrap-removing part separating the cut scrap; a vision part (160) inspecting the patterns and the dimensions of an electrode; a touch roll preventing the inflow of air; and a rewinder (180) winding an electrode from the touch roll.

Description

Electrode Manufacturing Device of Novel Structure

The present invention relates to an electrode manufacturing apparatus of a novel structure, and more particularly, to an apparatus for producing a plurality of unit electrodes from a continuous electrode sheet, a roller-shaped unwinder winding the electrode sheet; A meandering correction unit configured to monitor and correct the position of the electrode sheet transferred from the unwinder; A splice portion connecting new electrode sheets when all of the electrode sheets are unrolled; A cutting part including a laser for slitting and notching the electrode sheet using a scanner; Located at the bottom of the cutting portion scrap removal unit for separating the scrap cut by the laser; A vision unit for inspecting a pattern and a dimension of the cut electrode by an image sensor; A roller-shaped touch roll which maintains a pattern of the electrode and prevents air from entering during winding; It relates to a manufacturing apparatus comprising; and a roller-shaped winding machine for rewinding the electrode in the touch roll.

As the price of energy sources increases due to the depletion of fossil fuels, and the interest of environmental pollution is increasing, the demand for environmentally friendly alternative energy sources becomes an indispensable factor for future life. As demand increases, demand for secondary batteries as energy sources is rapidly increasing.

Representatively, there is a high demand for rectangular secondary batteries and pouch secondary batteries, which can be applied to products such as mobile phones with a thin thickness in terms of shape of batteries, and lithium ion batteries with high energy density, discharge voltage, and output stability in terms of materials. There is a high demand for lithium secondary batteries such as lithium ion polymer batteries.

In general, a secondary battery is formed by applying an active material to the surface of a current collector to form a positive electrode and a negative electrode, and forming an electrode assembly through a separator therebetween, and then into a pouch-shaped case of a cylindrical or rectangular metal can or an aluminum laminate sheet. It is mounted, and is prepared by injecting or incorporating a liquid electrolyte mainly into the electrode assembly or using a solid electrolyte.

Here, the electrode assembly is manufactured in various sizes according to the size and shape of the battery case and the capacity required in the field used, for this purpose, it is necessary to cut the electrode and the separator constituting the electrode assembly to a predetermined size.

As a cutting process for cutting electrodes and separators, many shear mold technologies using dies and punches are used. However, the following problems occur when cutting an electrode composed of a metal current collector and an active material layer by the above method.

First, when cutting the electrode with a shearing mold, it is necessary to periodically grind the mold in order to smooth the shear surface of the electrode. In addition, even if the mold is periodically polished, a problem may occur in the safety of the secondary battery because burrs are likely to be generated at the end faces of the electrodes. That is, the burr generated on the end surface of the electrode may penetrate the separator and contact the opposite electrode in the process of assembling or periodically inflating and contracting the battery, thereby causing an internal short circuit.

Second, since it is difficult to precisely cut an electrode of a desired size with a shearing mold, first, the electrode is first cut to an approximate size, and then cut using two cutting processes of second cutting to a desired size. Therefore, the number of processes is increased, resulting in an increase in manufacturing time and cost.

Third, since the shear mold has a constant shape, it is difficult to cut electrodes of various sizes and shapes. In order to cut a new size and shape of electrodes, a new mold must be manufactured again, which increases manufacturing costs. have.

Fourth, when cutting the electrode with a shearing mold, a rather large amount of electrode dust is generated during the cutting of the electrode, such a large amount of electrode dust is mixed into the battery to act as a factor that degrades the performance of the battery Have.

In this regard, Korean Unexamined Patent Publication No. 2001-0007879, Korean Unexamined Patent Publication No. 2007-0064690, and Korean Unexamined Patent Publication No. 2008-0101725 disclose a technique related to a method of manufacturing a secondary battery electrode using a laser.

However, the above-mentioned prior arts are related to a technique of linearly cutting a secondary battery electrode, which is not suitable for processing a specific shape, and there is a problem in that it does not provide a technique for winding without damage after cutting the electrode.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

Accordingly, it is an object of the present invention to provide an electrode manufacturing apparatus which is suitable for processing an electrode for secondary batteries into a desired shape and is excellent in processing efficiency.

Another object of the present invention is to provide a manufacturing apparatus capable of automatically controlling tension and speed to improve safety and processability.

In addition, another object of the present invention is to provide a secondary battery including an electrode for secondary batteries manufactured using the above-described manufacturing apparatus.

Therefore, the manufacturing apparatus according to the present invention for achieving the above object, as a device for manufacturing a plurality of unit electrodes from a continuous electrode sheet is coated with an electrode active material on one side or both sides,

A roller-shaped unwinder in which an electrode sheet is wound;

A meandering correction unit configured to monitor and correct the position of the electrode sheet transferred from the unwinder;

A splice for connecting a new electrode sheet when all of the electrode sheets are unrolled;

A cutting part including a laser for slitting and notching the electrode sheet using a scanner;

Located at the bottom of the cutting portion scrap removal unit for separating the scrap cut by the laser;

A vision unit inspecting a pattern and a dimension of the cut electrode by an image sensor;

A roller-shaped touch roll which maintains a pattern of the electrode and prevents air from entering during winding; And

A roller-shaped rewinder for rewinding the electrode in the touch roll;

.

That is, in the manufacturing apparatus according to the present invention, not only a straight cut of the electrode, but also a notching step as a previous step for the production of the electrode shape and the shape of the electrode tab are possible. As a result, the manufacturing apparatus of the present invention can reduce the cost incurred by providing a separate notching facility, etc., it is possible to provide a secondary battery excellent in price competitiveness.

In addition, it is not necessary to move the electrode to a place where a notching facility or the like is installed, and the post process can be performed by continuous work in one space, thereby achieving an effect of improving processability.

In addition, real-time automatic control of tension and speed is possible as described below, which is suitable for an automated process and provides high productivity.

In one preferred example, a powder brake may be positioned at a position adjacent to the take-up and a servo motor may be positioned at a position adjacent to the take-up.

In this structure, the powder brake can be controlled in real time by detecting the tension of the electrode sheet transferred from the unwinder, the electrode sheet in the cut state is the servo motor senses the speed by the encoder, friction roll ), The tension can be detected and controlled by air pressure.

Therefore, since the tension of the electrode sheet is automatically controlled in real time, it is easily transferred to the cutting portion, and the tension and the winding control are performed so that the shape of the electrode sheet can be wound without damage after slitting and notching.

On the other hand, the cutting portion may be configured in a variety of positions depending on the volume and the structure of the manufacturing apparatus, for example, two front lasers and four rear lasers respectively provided before and after the basis of the direction in which the electrode sheet is moved. It may be.

Therefore, the upper and lower patterns of the electrode can be processed by the front laser and the rear laser, respectively.

In the above structure, it may further include rollers positioned adjacent to the bottom of the cutting portion, and controls the tension during the secondary cutting by the rear laser after the primary cutting by the front laser.

Specifically, the rollers include an active roller at a position corresponding to the outside of the front laser and the rear laser, and a tension at a position corresponding to the inside of the front laser and the rear laser and a position corresponding to the scrap remover. It may include a roller (tension roller). Here, the active roller of the structure in which the motor is attached is formed in a structure to hold the electrode can easily control the overall tension.

In one specific example, the tension roller may be composed of an upper roller and a lower roller, the lower roller is fixed, and can finely move the upper roller and control the tension of the electrode sheet.

At this time, the tension size of the powder brake is controlled to be larger than the tension size of the tension roller which is a position through the cut portion, preferably, when the tension size of the tension roller is W% 0.1% by the powder brake The tension magnitude can be controlled at wh 1%.

On the other hand, since the electrode material of the secondary battery is formed of a thin metal foil and a coating layer, when cutting the electrode of the secondary battery using a laser, it is possible to minimize the burrs generated on the cutting surface by precisely cutting the thin electrode material. There is a need for a laser capable of minimizing damage to the electrode material that can be generated by transferring heat of the laser to the material.

In one preferred embodiment, laser oscillation using fiber pulses is used for electrode cutting, thereby minimizing burr and electrode dust that may be generated on the cutting surface during cutting, and preventing the metal foil and the coating layer from being thermally damaged. You can prevent it.

In this case, it is preferable that the output capacity of the laser is 100 W or more, oscillation at a pulse repetition rate of 800 to 35000 kHz, and is made in the wavelength range of 1050 to 1080 nm.

On the other hand, the splice portion may have a structure in which the electrode sheet flows around the foil by a foil leader when the electrode sheet is newly connected.

The present invention also provides a lithium secondary battery comprising a secondary battery electrode and the secondary battery electrode manufactured using the above-described manufacturing apparatus.

The secondary battery electrode may be prepared by applying a slurry made by selectively mixing an electrode active material, a binder, a conductive agent, a filler, and the like with a solvent such as NMP on a metal current collector, followed by drying and rolling.

The metal current collector is not particularly limited as long as it is a metal having high conductivity without causing chemical change in the battery. For example, the positive electrode current collector may be stainless steel, aluminum, nickel, titanium, calcined carbon, or a surface treated with carbon, nickel, titanium, silver, or the like on the surface of aluminum or stainless steel. As a whole, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, a surface treated with carbon, nickel, titanium, silver, or the like on the surface of copper or stainless steel, aluminum-cadmium alloy and the like can be used.

The metal current collector is generally manufactured in a thickness of 3 to 500 μm, and may form fine irregularities on its surface to increase adhesion of the electrode active material, and may be a film, sheet, foil, net, porous body, foam, or nonwoven fabric. Various forms are possible.

The lithium secondary battery includes an electrode assembly composed of a positive electrode and a negative electrode, and a separator interposed therebetween, and a lithium salt-containing non-aqueous electrolyte.

The positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive agent, and a binder onto a positive electrode current collector, followed by drying. If necessary, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive agent is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Such a conductive agent is not particularly limited as long as it has electrical conductivity without causing a chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is added to the binder in an amount of 1 to 30% by weight, based on the total weight of the mixture containing the cathode active material, as a component that assists in bonding between the active material and the conductive agent and bonding to the current collector. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by coating and drying a negative electrode material on the negative electrode current collector, and if necessary, the conductive agent, binder, filler, and the like as described above may be further included.

The negative electrode material may be, for example, carbon such as hardly graphitized carbon or graphite carbon; _{Li x Fe 2 O 3 (0≤x≤1} ), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, Halogen, 0 < x &lt; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 mu m and the thickness is generally 5 to 300 mu m. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like; Kraft paper or the like is used.

In some cases, a gel polymer electrolyte may be coated on the separation membrane to increase the stability of the cell. Representative of such gel polymers are polyethylene oxide, polyvinylidene fluoride, polyacrylonitrile and the like.

When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The lithium salt-containing non-aqueous electrolyte is composed of a non-aqueous electrolyte and a lithium salt. As the non-aqueous electrolyte, a non-aqueous electrolyte, a solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, But are not limited to, lactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, Nitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxymethane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives , Tetrahydrofuran derivatives, ether, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

As the inorganic solid electrolyte, for example, Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO _4- LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides, sulfates and the like of Li, such as Li ₄ SiO ₄ -LiI-LiOH, Li ₃ PO ₄ -Li ₂ S-SiS ₂ , and the like, may be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving charge / discharge characteristics, flame retardancy, etc., non-aqueous electrolytes may be used in the form of, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride, etc. are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

The lithium secondary battery may not only be used in a battery cell used as a power source for a small device, but may also be preferably used as a unit battery in a medium-large battery module including a plurality of battery cells.

Also, the present invention provides a battery pack including the battery module as a power source of a middle- or large-sized device, wherein the middle- or large-sized device is an electric vehicle (EV), a hybrid electric vehicle (HEV) An electric vehicle including a plug-in hybrid electric vehicle (PHEV), a power storage device, and the like, but the present invention is not limited thereto.

As described above, the electrode manufacturing apparatus of the present invention is equipped with the optimum conditions for the automated process, and exhibits a remarkably excellent electrode processing efficiency and electrode processing quality, the secondary battery including the electrode manufactured by using the safety is There is an advantage that the effect is significantly improved.

1 is a schematic diagram of a manufacturing apparatus according to an embodiment of the present invention;
2 is a side view of the manufacturing apparatus of FIG. 1;
3 is a schematic diagram of a powder brake and a servo motor;
4 is a schematic view of the rollers located at A of FIG. 1 and B of FIG. 3.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 is a schematic diagram of a manufacturing apparatus according to an embodiment of the present invention, Figure 2 is a schematic side view of the manufacturing apparatus of FIG.

Referring to these drawings, the electrode manufacturing apparatus 100 is an apparatus for manufacturing a plurality of unit electrodes from the continuous electrode sheet 10 is coated with an electrode active material on one side or both sides.

The electrode manufacturing apparatus 100 includes a roller-shaped unwinder 110 in which an electrode sheet 10 is wound; A meandering correction unit 120 which monitors and corrects the position of the electrode sheet 10 transferred from the unwinder 110 and comprises an EPC sensor; A splice unit 130 connecting new electrode sheets when all of the electrode sheets 10 are unrolled; A cutting unit 140 including a laser for slitting and notching the electrode sheet 10 using a galvanometer scanner (not shown); Located at the bottom of the cutting unit 140, the scrap removal unit 150 for separating the scrap cut by the laser (141, 142); A vision unit 160 for inspecting the pattern and the dimension of the cut electrode by the image sensor; A roller-shaped touch roll 170 which maintains a pattern of electrodes and prevents air from entering during winding; And a roller-shaped winding machine 180 which rewinds the electrode in the touch roll 170.

The splice part 130 is wound on the foil by the foil leader 135 when the electrode sheet 10 is newly connected to allow the electrode sheet 10 to flow therein.

The cutting part 140 is provided with two front lasers 141 and four rear lasers 142 before and after each other based on a direction (arrow) in which the electrode sheet 10 moves.

Specifically, the lasers 141 and 142 are fiber pulse lasers, respectively, having an output capacity of about 150 W, a pulse repetition rate of about 10000 kHz, and a wavelength of the laser is 1060 nm.

Therefore, it is possible to minimize burr and electrode dust that may be generated on the cutting surface during cutting, and to perform slitting and notching while preventing the metal foil and the coating layer from being thermally damaged.

3 is a schematic diagram of a powder brake and a servo motor.

Referring to FIG. 3 together with FIGS. 1 and 2, the powder brake 200 is positioned at the position adjacent to the unwinder 110, and the servo motor 210 is positioned at the position adjacent to the winder 180.

The powder brake 200 detects and controls the tension of the stacked electrode sheet 10 to easily transfer it to the cutting unit 140.

The servo motor 210 detects the speed by the encoder 211 so that the shape of the electrode sheet 10 formed of the metal foil 11 and the coating layer 12 can be wound without damage after slitting and notching, The friction roll 212 senses and controls tension by air pressure.

FIG. 4 is a schematic view of the rollers located at A of FIG. 1 and B of FIG. 3.

Referring to FIG. 4 together with FIGS. 1 to 3, the rollers 300 are positioned adjacent to the lower end of the cutting unit 140, and are formed by the rear laser 142 after the first cutting by the front laser 141. Control the tension during the second cut.

Specifically, the rollers 300 include an active roller 310 at positions corresponding to the outside of the front laser 141 and the rear laser 142, and inside the front laser 141 and the rear laser 142. The tension roller 320 is included at a corresponding position, that is, at a position corresponding to the inside of the laser region (hatched) and the scrap remover 150.

The tension roller 320 is composed of an upper roller 321 and a lower roller 322, the lower roller 322 is fixed, the upper roller 321 can be moved to control the tension of the electrode sheet 10 do.

Accordingly, the manufacturing apparatus 100 according to the present invention can be processed in the shape of the electrode sheet in real time while easily controlling the tension.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (18)

An apparatus for manufacturing a plurality of unit electrodes from a continuous electrode sheet coated with an electrode active material on one side or both sides,
A roller-shaped unwinder in which an electrode sheet is wound;
A meandering correction unit configured to monitor and correct the position of the electrode sheet transferred from the unwinder;
A splice for connecting a new electrode sheet when all of the electrode sheets are unrolled;
A cutting part including a laser for slitting and notching the electrode sheet using a scanner;
Located at the bottom of the cutting portion scrap removal unit for separating the scrap cut by the laser;
A vision unit inspecting a pattern and a dimension of the cut electrode by an image sensor;
A roller-shaped touch roll which maintains a pattern of the electrode and prevents air from entering during winding; And
A roller-shaped rewinder for rewinding the electrode in the touch roll;
Manufacturing apparatus comprising a. 2. A manufacturing apparatus according to claim 1, wherein a powder brake is located at a position adjacent to the unwinder, and a servo motor is positioned at a position adjacent to the unwinder. The apparatus of claim 2, wherein the powder brake detects and controls the tension of the loaded electrode sheet. The apparatus of claim 2, wherein the servo motor senses a speed by an encoder and senses and controls a tension by air pressure by a friction roll. The apparatus as claimed in claim 1, wherein the cutting part is provided with two front lasers and four rear lasers, respectively, before and after each other based on a direction in which the electrode sheet moves. 6. The manufacturing apparatus according to claim 5, further comprising rollers positioned adjacent to a lower end of the cutting portion and controlling tension during the second cutting by the rear laser after the first cutting by the front laser. 7. The roller of claim 6, wherein the rollers include an active roller at a position corresponding to the outside of the front laser and the rear laser, and correspond to a position corresponding to the inside of the front laser and the rear laser and the scrap remover. And a tension roller in position. 8. The manufacturing apparatus according to claim 7, wherein the tension roller is composed of an upper roller and a lower roller, and the lower roller is fixed, and the upper roller is moved to control the tension of the electrode sheet. According to claim 8, wherein the tension roller size of the tension device is characterized in that the tension by the powder brake ㅁ 1% when ㅁ 0.1%. The apparatus of claim 1, wherein the laser is a fiber pulse laser. The manufacturing apparatus according to claim 1, wherein an output capacity of the laser is 100 W or more. The apparatus of claim 1, wherein a pulse repetition rate of the laser is 800 to 35000 kHz. The apparatus of claim 1, wherein the wavelength of the laser is 1050 to 1080 nm. The apparatus of claim 1, wherein the scanner is a galvanometer scanner. The apparatus of claim 1, wherein the meandering correction unit is made of an EPC sensor. The apparatus of claim 1, wherein the splice part is wound around the foil by a foil leader when the electrode sheet is newly connected. A secondary battery electrode, which is produced using the apparatus according to any one of claims 1 to 16. A lithium secondary battery comprising the electrode for a secondary battery according to claim 17.

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