KR20170092223A - Cutting Device Using Laser - Google Patents

Abstract

The present invention relates to a laser cutting apparatus for cutting a laminated base material by irradiating a laser beam, including: first fixing jigs for pressing downwardly and fixing base materials in a structure of being closely attached to an upper surface of the uppermost base material among the laminated base materials in a state of securing s central spacing region for laser irradiation; second fixing jigs for pressing upwardly and fixing the base materials in a structure of being closely attached to a lower surface of the lowermost base material among the laminated base materials; and a laser irradiator for irradiating a laser beam at a center spacing region secured by the first fixing jigs so as to cut the base materials, wherein the first fixing jigs are configured to adjust to adjust an interval of the central spacing region where the laser beam is irradiated, in a process of irradiating the laser beam. Accordingly, the present invention is able to minimize burrs and quality failure problems that may be generated on a cut surface of base materials laminated in a multiple-layer structure.

Description

{Cutting Device Using Laser}

The present invention relates to a laser cutting apparatus.

As technology development and demand for mobile technology increases, the demand for secondary batteries as energy sources is rapidly increasing, and accordingly, researches on batteries capable of meeting various demands are being conducted. Particularly, there is a high demand for a lithium secondary battery having a high energy density, a discharge voltage and an output stability.

Generally, a secondary battery has a structure in which an active material is applied to the surface of a collector to form an anode and a cathode, an electrode assembly is formed therebetween with a separator interposed therebetween, and then a cylindrical or square metal can or aluminum laminate sheet And is mainly manufactured by injecting or coalescing a liquid electrolyte into the electrode assembly or using a solid electrolyte.

Here, the electrode assembly is manufactured in various sizes depending on the size and shape of the outer case and the capacities required in the field to be used. For this purpose, it is essential to cut the electrodes and the separator forming the electrode assembly into a predetermined size.

The shear mold technique using die and punch is widely used for the cutting process of the electrode and the separator. However, when the electrode composed of the metal current collector and the active material layer is cut by the above method, the following problems occur.

First, when the electrode is cut by the shearing mold, it is troublesome to periodically polish the mold in order to smooth the front end face of the electrode. Also, even if the metal mold is periodically polished, there is a high possibility that burrs are generated on the end face of the electrode, which may cause a problem in safety of the secondary battery. That is, the burr formed on the end face of the electrode may cause an internal short circuit by contacting the opposite electrode through the separator during the process of assembling the battery or periodically expanding and contracting during operation.

Secondly, since it is difficult to precisely cut an electrode of a desired size in a shearing mold, the electrode is first cut to a rough size, and then cut using a second cutting step in which the second size is cut to a desired size. Therefore, the number of process steps is increased, resulting in an increase in manufacturing time and cost.

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

Fourth, when the electrode is cut by the shearing mold, a large amount of electrode dust is generated during the cutting process of the electrode, and such a large amount of electrode dust is mixed with the battery, thereby deteriorating the performance of the battery. Have.

In general, electrode cutting is performed on a finished sheet coated with active material on both sides of a current collecting body such as a metal foil. Since defective electrodes can not be recycled and are discarded, a high defect rate at the time of electrode cutting is, Which is one of the main factors for increasing the waste amount and consequently increasing the manufacturing cost of the battery.

In this regard, Korean Patent Registration No. 0391931 discloses a technique for manufacturing an electrode for a lithium secondary battery through a process of cutting an electrode plate coated with an active material of the electrode by using a laser.

However, in the technique using the laser, the base material laminated in a multi-layer structure must be cut out by repeatedly emitting the laser repeatedly without being cut by laser emission once.

Therefore, unnecessary heat is transferred due to laser interference even after cutting some of the uppermost layer of the base material, which is laminated by the multilayer structure due to repetitive laser emission, resulting in nonuniform cutting or burning of the base material, There is a high possibility that burrs are generated on the end faces as in the case of cutting using a mold.

Particularly, in the case of some layers located at the lower end among the base materials stacked in a multilayer structure, sufficient energy can not be transferred due to interference generated at the upper portion, so that the number of times of laser emission increases, And it is also difficult to manufacture a precise electrode at a desired level in current industrial trends in which a secondary battery of light and short shortening is required.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

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

The inventors of the present application have conducted intensive research and various experiments and, as will be described later, a laser cutting apparatus for cutting a laminated base material by irradiating a laser, And a second fixing jig for pushing and fixing the base materials upward by a structure that is in close contact with the bottom surface of the lowermost base material among the laminated base materials, It is possible to minimize the problem of burrs and quality defects that may occur on the cutting face of the base material laminated in a multi-layered structure by structuring such that the spacing of the central spaced portions where the laser beams are irradiated is adjusted in the irradiation process of the laser, Can be used to produce electrodes of various sizes desired by the cutting process using the number of laser emissions of Was, leading to the optimal process conditions in the production process confirmed that can perform that action, and completed the present invention.

According to an aspect of the present invention, there is provided a laser cutting apparatus for cutting a laminated base material by irradiating a laser,

First fixing jigs for pressing and fixing the base materials with a structure in close contact with the upper surface of the uppermost one of the laminated base materials in a state where a center spacing for laser irradiation is ensured;

A second fixing jig for pressurizing and fixing the base materials with a structure that is in close contact with the bottom surface of the lowermost base material among the stacked base materials; And

A laser irradiator for irradiating a laser at a center spaced portion secured by the first fixing jigs to cut the base materials;

And,

The first fixing papers are configured to adjust the interval of the central spaced portion where the laser is irradiated in the irradiation process of the laser.

Therefore, the laser cutting apparatus according to the present invention is characterized in that the laser cutting apparatus according to the present invention comprises a first fixing jig for pushing down and fixing the base materials with a structure in close contact with the upper surface of the uppermost base material among the laminated base materials, And a second fixing jig for press-fixing the base materials upward by fixing the first fixing jig to the first fixing jig, wherein the first fixing jig is configured to adjust the interval of the center spaced portion where the laser is irradiated in the irradiation process of the laser, It is possible to minimize the burrs and quality defects that may occur on the cut surfaces and to manufacture electrodes of various sizes desired by the cutting process using the minimum number of laser emission times. In the mass production process, And the like.

It is preferable that the fixing member comprises a structure in which the laminated base material is fixed therebetween and the gap is adjusted in the process of laser irradiation. Specifically, the first fixing member is composed of a pair of A first upper jig and a second upper jig, and the second fixing jig may be composed of a pair of a first lower jig and a second lower jig located opposite to each other.

In this structure, the first upper end jig presses one end portion of the upper surface of the uppermost one of the laminated base materials downward, and the second upper end jig presses the other end portion of the upper surface of the uppermost base material of the laminated base materials downward Lt; / RTI >

At this time, in order to secure a space corresponding to the central spacing of the first fixing papers, the second fixing papers press up one side end portion of the lower surface of the bottom base material among the base materials in which the first bottom jig is laminated, 2 lower jig may be a structure for upwardly pressing the other end portion of the bottom surface of the lowermost base material among the laminated base materials.

In another specific example, the first fixing jigs and the second fixing jig may be moved upward and downward, respectively, in order to adjust the frictional force applied to the preforms in a state of being in contact with the preforms positioned therebetween Structure.

Therefore, the first upper jig positioned at the upper end of the laminated base material is configured to press the laminated base material at positions corresponding to the first lower end jig, and conversely, the second upper end jig located at the upper end of the laminated base material May be configured to press the laminated base material at positions corresponding to the second lower jig.

The laser cutting apparatus according to the present invention is configured such that in the irradiation process of the laser, the first fixing jig moves so as to adjust the interval of the center spaced portion irradiated with the laser, The frictional force K between the base materials which are generated when they press the laminated base materials is less than or equal to the pressure P applied to the top base material as they adjust the size of the central spacing space It is preferable to be adjusted.

In addition, it is preferable that the pressure P applied to the topmost preform is smaller than the force F that causes deformation of the preforms when the first fixing fibers adjust the size of the center spacing space.

That is, when the first fixing pads adjust the size of the center spacing space, it is preferable that the pressure applied to the uppermost parent material is controlled to be larger than the frictional force between the parent materials, .

In one specific example, the first lower jig and the second lower jig may be fixed in a fixed position in a process of adjusting the size of the center spacing space by the first fixing jigs.

In addition, the size of the center spacing space by the first fixing jigs is adjusted in such a manner that a downward extension line of the inner ends of the first fixing paper does not deviate from the upper surface of the first lower jig and the upper surface of the second lower jig Lt; / RTI >

Meanwhile, in the laser irradiation apparatus according to the present invention, the gap between the first upper jig and the second upper jig is a structure for minimizing laser interference during the laser irradiation process, so that the first upper jig and the second upper jig , It is necessary to operate so as to move away from each other in the opposite direction so as to increase the size of the central spacing portion in the laser irradiation process.

Specifically, the size adjustment of the central spacing portion by the first upper jig and the second upper jig may be performed such that, in the laser irradiation process, one end portion and the other end portion of the laminated base material, which are in contact with the first upper jig and the second upper jig, May be structured such that the intervals between the cut base materials are adjusted so as to increase from the top to the bottom.

In order to minimize the damage of the base material due to the laser interference, the laser irradiator may be structured such that the base materials move downward as the base materials are sequentially cut and irradiate the laser.

As described above, the base materials may be an electrode sheet in which an electrode mixture containing an electrode active material is applied on a current collector, and may be a polyolefin-based separator substrate, or may be a separator substrate or a separator substrate. Inorganic composite porous separator in which an active layer coated with a mixture of a binder polymer and a binder polymer is formed.

In addition, the material used as the pouch-type case may be a laminate sheet including an outer coating layer, a metal barrier layer, and an inner sealant layer, but is not limited thereto.

The present invention is also a method for cutting a base material of a multi-layer structure using the laser cutting apparatus,

(a) positioning the base materials in a stacked state between the first fixing jigs and the second fixing jigs;

(b) fixing the base materials by moving the first fixing jigs and the second fixing jigs upward and downward;

(c) a process of irradiating the base material with a laser beam vertically using a laser irradiation machine;

(d) moving the first fixing jigs and the second fixing jigs upward or downward to remove the fixing structure for the base material;

The cutting method according to claim 1,

In the step (c), as the base materials are cut by the laser irradiation, the spacing of the cut base materials may be sequentially increased, thereby increasing the size of the center spacing space of the first fixing paper.

In addition, as the size of the center spacing space of the first fixing paper is increased, the laser irradiator may be configured to move downward toward the base materials sequentially.

The present invention can also provide a base material for a secondary battery manufactured by the above cutting method, and can provide a secondary battery including the base material.

The secondary battery may be a lithium ion secondary battery or a lithium ion polymer secondary battery. The secondary battery may include a cathode, a cathode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, 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 material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or 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 whiskey 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 a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. 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 applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

Examples of the negative electrode active material include carbon such as non-graphitized carbon and 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 is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

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

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, 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.

Examples of the inorganic solid electrolyte include 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 and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can 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 the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, 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 present invention can also provide a battery pack including the secondary battery as a unit battery, and the device can be applied to a notebook computer, a netbook, a tablet PC, a mobile phone, an MP3, A wearable electronic device, a power tool, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV) But is not limited to, an E-bike, an E-scooter, an electric golf cart, or a system for power storage.

The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

As described above, the laser cutting apparatus according to the present invention comprises a first fixing jig for pushing and fixing the base materials downward by a structure in close contact with the upper surface of the uppermost base material among the base materials to be laminated, And a second fixing jig for pressurizing and fixing the base materials with a structure in which the base materials are closely contacted to the lower surface of the substrate, It is possible to minimize burrs and quality defects that may occur on the cut surface of the laminated base material, and it is possible to manufacture electrodes of various sizes as desired by a cutting process using a minimum number of laser emission times, It is possible to provide an effect that the work can be performed by the process condition.

1 and 2 are schematic views showing an operating structure of a laser cutting apparatus according to one embodiment of the present invention;
3 to 6 are schematic views illustrating a process of cutting a base material using a laser cutting apparatus according to an embodiment of the present invention.

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 and 2 are schematic views showing an operating structure of a laser cutting apparatus according to one embodiment of the present invention.

Referring to these drawings, the laser cutting apparatus 100 according to the present invention includes a structure in which a central spacing region for laser irradiation is secured, and a structure (see FIG. 3) The first upper jig 111 and the second upper jig 112 are positioned opposite to each other.

The first lower jig 121 and the second lower jig 122 are positioned opposite to each other, and the first lower jig 121 and the second lower jig 122 are located opposite to each other. And a laser irradiator 130 for irradiating a laser to cut the base materials is located at a center spacing secured by the upper jig 111 and the second upper jig 112. [

In this structure, the first upper end jig 111 presses one end portion of the upper surface of the uppermost one of the laminated base materials downward, and the second upper end jig 112 presses the other end end portion of the upper surface of the uppermost base material As shown in Fig.

The first lower jig 121 presses one side end portion of the lower surface of the lowermost one of the laminated base materials upward and presses the other end portion of the lower surface of the lowermost base material among the base materials in which the second lower edge jig 122 is laminated And pressurized upward.

This structure is applied to the base materials in a state of being in close contact with the base materials located between the first upper and lower jigs 111 and 112 and between the first and second lower jigs 121 and 122 Is configured to be movable upward or downward to adjust the frictional force.

Accordingly, the first upper jig 111 is configured to press the base materials by adjusting the first lower jig 121 located at the lower end and the gap therebetween, and the second upper jig 112 is configured to press the base materials, The upper jig 122 and the lower jig 122 to adjust the gap therebetween to press the base materials.

2, the first upper jig 111 and the second upper jig 112 are formed in a state in which the first lower jig 121 and the second lower jig 122 are fixed, The first upper jig 111 and the second upper jig 112 are configured to adjust the distance between them so that the intervals between the first and second upper jigs 111 and 112 increase from top to bottom. Structure so that they are spaced apart from each other in the direction opposite to each other.

At this time, the size of the center spacing space adjusted by the first upper jig 111 and the second upper jig 112 is such that a downward extension line of the inner ends of the first upper jig 111 and the second upper jig 112 The first lower jig 121 and the second lower jig 122 are adjusted in a range that does not deviate from the upper end surface.

In addition, the laser irradiator 130 has a structure in which the height of the laser irradiator 130 is adjusted upward or downward when the base materials are sequentially cut in the irradiation process of the laser, have.

3 to 6 are schematic views illustrating a process of cutting a base material using a laser cutting apparatus according to an embodiment of the present invention.

3, a first electrode material mixture layer 210 including an electrode active material is applied to the top of the current collector layer 220 (see FIG. 3) And a second electrode material mixture layer 230 including an electrode active material is applied to the lower end of the current collector layer 220. The first electrode material mixture layer 210 and the second electrode material mixture layer 220 are formed on both surfaces of the current collector layer 220, The electrode sheet 200 having the multilayer structure coated with the compound layer 230 is sandwiched between the first upper jig 111 and the second upper jig 112 and between the first lower jig 121 and the second lower jig 122 As shown in FIG.

The first upper jig 111 and the first lower jig 121 are moved downward and upward in the state where the electrode sheet 200 is positioned therebetween to fix the electrode sheet 200, 2 upper jig 112 and second lower jig 122 are moved downward and upward in the state that the electrode sheet 200 is positioned therebetween to fix the electrode sheet 200.

After the electrode sheet 200 is fixed, a laser is irradiated perpendicularly to the first electrode compound mixture layer 110 located at the uppermost end of the electrode sheet 200 by the laser beam machine 130, The first upper jig 111 and the second upper jig 112 are actuated to be spaced apart from each other in the direction opposite to each other.

In this process, the first and second upper jigs 111 and 112 and the first and second lower jigs 121 and 122 press the electrode sheet 200, The frictional force K between the mixture layer 210, the current collector layer 220 and the second electrode compound layer 230 is such that the first upper jig 111 and the second upper jig 112 are spaced apart in the direction opposite to each other Is kept smaller than the pressure (P) applied to the first electrode material mixture layer (210) at the time of liquefaction.

Next, as shown in FIG. 5, after the first electrode compound layer 210 is cut, the laser beam 130 is moved downward and irradiated with a laser beam. As shown in FIG. 6, The cutting operation proceeds to a structure in which the laser irradiator 130 continues to move downward after the lower limit of cutting the entire layer 220.

4 to 6, the process of adjusting the distance between the first upper jig 111 and the second upper jig 112 and the process of irradiating the laser while the laser beam 130 is moving downward are continuously performed And the gap is gradually increased in the process of cutting the first electrode material mixture layer 210, the current collector layer 220, and the second electrode material mixture layer 230, so that burrs and quality defect problems Can be minimized, and the number of laser emission times can be minimized.

3 to 6, the first electrode material mixture layer 210, the current collector layer 220, and the second electrode material mixture layer 230 may be formed on the first electrode material mixture layer 210, The base material of the multilayer structure described in the present invention has a structure in which the respective layers are not separated from each other and have a frictional force therebetween. In addition to the electrode as the base material, A separator having a multilayer structure, a laminate sheet, and the like.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (21)

A laser cutting apparatus for cutting a laminated base material by irradiating a laser,
First fixing jigs for pressing and fixing the base materials with a structure in close contact with the upper surface of the uppermost one of the laminated base materials in a state where a center spacing for laser irradiation is ensured;
A second fixing jig for pressurizing and fixing the base materials with a structure that is in close contact with the bottom surface of the lowermost base material among the stacked base materials; And
A laser irradiator for irradiating a laser at a center spaced portion secured by the first fixing jigs to cut the base materials;
And,
Wherein the first fixing member is configured to adjust the interval of the central spaced portion where the laser is irradiated in the irradiation process of the laser. [2] The apparatus of claim 1, wherein the first fixing members comprise a pair of first upper jigs and second upper jigs located opposite to each other, and the second fixing members are a pair of first A lower jig, and a second lower jig. The method as claimed in claim 2, wherein the first upper jig downwardly presses one end portion of the upper surface of the uppermost one of the laminated base materials, and the second upper jig moves the other end portion of the upper surface of the uppermost base material of the laminated base materials And a structure for pressing downward. 3. The method according to claim 2, wherein, in order to secure a space corresponding to the central spacing part of the first fixing paper, the first lower fixing jig presses upward the one end portion of the lower surface of the lower one of the laminated base materials And the second lower jig is a structure for pressing upward the other end portion of the lower surface of the base material among the base materials in which the second bottom jig is laminated. 3. The apparatus according to claim 2, wherein the first fixing jigs and the second fixing jig are movable upward and downward in order to adjust the frictional force applied to the base materials, Wherein the laser beam is a laser beam. 6. The method according to claim 5, wherein the frictional forces K between the first and second fixing jigs and the second base fixing members are such that when the first fixing base members adjust the size of the centering space, Is less than or equal to the pressure (P) applied to the base material. The laser cutting apparatus according to claim 6, wherein the pressure P applied to the uppermost parent material when the first fixing paper is adjusted in size of the center spacing space is smaller than a force F that causes deformation of the parent materials. The laser cutting apparatus according to claim 4, wherein the first lower jig and the second lower jig are fixed in a fixed position in a process of adjusting the size of the center spacing space by the first fixing jigs. The jig according to claim 8, wherein a size of the center spacing space by the first fixing jigs is a size of the first fixing jig, And the laser beam is adjusted. 3. The laser cutting apparatus of claim 2, wherein the first and second upper jigs and the second upper jig are spaced apart from each other in the laser irradiation process so as to increase the size of the central spacing portion. 11. The method according to claim 10, wherein the adjustment of the center spacing by the first upper jig and the second upper jig is such that, in the laser irradiation process, the intervals between the cut base materials are adjusted so as to increase from top to bottom A laser cutting device. [2] The laser cutting apparatus of claim 1, wherein the laser irradiator moves the laser beam in a downward direction as the base materials are sequentially cut in the laser irradiation process. The laser cutting apparatus according to claim 1, wherein each of the base materials is an electrode sheet on which an electrode mixture containing an electrode active material is applied on a current collector. The organic / inorganic composite porous material according to claim 1, wherein each of the base materials is a polyolefin-based separator substrate, or an organic / inorganic composite porous substrate having an active layer coated with a mixture of inorganic particles and a binder polymer on one surface or both surfaces of the separator substrate and the separator substrate Wherein the laser beam is a separation film. The laser cutting apparatus of claim 1, wherein each of the preforms is a laminate sheet comprising an outer coating layer, a metal barrier layer and an inner sealant layer. A method of cutting a base material having a multilayer structure using the laser cutting apparatus according to any one of claims 1 to 15,
(a) positioning the base materials in a stacked state between the first fixing jigs and the second fixing jigs;
(b) fixing the base materials by moving the first fixing jigs and the second fixing jigs upward and downward;
(c) a process of irradiating the base material with a laser beam vertically using a laser irradiation machine;
(d) moving the first fixing jigs and the second fixing jigs upward or downward to remove the fixing structure for the base material;
&Lt; / RTI &gt; 17. The method of claim 16, wherein in step (c), as the preforms are cut by laser irradiation, the spacing of the cut preforms sequentially increases so as to increase the size of the center spacing space of the first fixture Cutting method. The cutting method according to claim 17, wherein as the size of the center spacing space of the first fixing paper is increased, the laser irradiator sequentially moves downward toward the base materials. A preform for a secondary battery, which is manufactured by the cutting method according to claim 16. A secondary battery comprising the base material according to claim 19. A battery pack comprising a secondary battery according to claim 20 as a unit battery.

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