WO2018038435A1

WO2018038435A1 - Apparatus for manufacturing electrode assembly comprising air blowing unit

Info

Publication number: WO2018038435A1
Application number: PCT/KR2017/008698
Authority: WO
Inventors: 강정환
Original assignee: 주식회사 엘지화학
Priority date: 2016-08-26
Filing date: 2017-08-10
Publication date: 2018-03-01
Also published as: PL3370292T3

Abstract

The present invention relates to an apparatus for manufacturing an electrode assembly, the apparatus comprising: a lower air blowing unit for blowing air to an end of a cut separation membrane sheet so that the end of the separation membrane sheet can be bent in a height direction from the ground during primary winding; and an upper air blowing unit for blowing air to the end of the separation membrane sheet so that the end of the separation membrane sheet can be bent in a downward direction toward the ground of a first unit cell in a state where the first unit cell is primarily wound. Accordingly, it is possible to prevent flat folding of the separation membrane sheet during the process for manufacturing the electrode assembly, thereby minimizing defects caused by contact between electrodes.

Description

Electrode assembly manufacturing apparatus including air blowing unit

The present invention relates to an electrode assembly manufacturing apparatus comprising an air blowing unit.

Secondary batteries are widely used as a power source for mobile devices such as mobile phones, laptops and camcorders. In particular, the use of lithium secondary batteries is rapidly increasing due to the advantages of high operating voltage and high energy density per unit weight.

The lithium secondary battery may be classified into a lithium ion battery, a lithium ion polymer battery, a lithium polymer battery, and the like according to the composition of the electrode and the electrolyte, and among them, the amount of leakage of the electrolyte is less likely, and the amount of the lithium ion polymer battery that is easy to manufacture is used. This is increasing.

A lithium ion polymer battery (LiPB) is a structure in which an electrolyte solution is impregnated into an electrode assembly in which electrodes (anode and cathode) and a separator are heat-sealed, and is mainly used in a form in which the electrode assembly is sealed in a pouch type case of an aluminum laminate sheet. Thus, lithium ion polymer batteries are often referred to as pouch cells.

FIG. 1A schematically illustrates a general structure of a representative secondary battery including a stack / foldable electrode assembly, and FIG. 1B schematically illustrates a process of manufacturing the electrode assembly of FIG. 1A.

Referring to FIG. 1A, the secondary battery 10 includes an electrode assembly 30 formed of a positive electrode, a negative electrode, and a separator disposed therebetween inside a pouch-type battery case 20, and a positive electrode and a negative electrode thereof. The

tabs

31 and 32 are welded to the two electrode leads 40 and 41, respectively, and are configured to be exposed to the outside of the battery case 20.

The battery case 20 is made of a soft packaging material such as an aluminum laminate sheet, and includes a case main body 21 and a concave shape receiving portion 23 in which the electrode assembly 30 can be seated. One side is made of a cover 22 is connected.

The electrode assembly 30 used for the secondary battery 10 has a stack / folding structure as shown in FIG. 1A. In the electrode assembly 30, a plurality of positive electrode tabs 31 and a plurality of negative electrode tabs 32 are welded to the electrode leads 40 and 41, respectively. Attached to each of the electrode leads 40 and 41 are insulating films 51 and 52.

Referring to FIG. 1B, the electrode assembly 30 arranges a plurality of

unit cells

61 and 62 on the separator sheet 50 and arranges the

unit cells

61 and 62 into the separator sheet 50. It is prepared by winding together sequentially.

At this time, in the state in which the first unit cell 61 is first wound, the end 70 (so-called 'No. 0 separator') of the separator sheet 50 covering the first unit cell 61 is When turned upside down, there is often a problem that the surface of the first unit cell 61 and the surface of the second unit cell 62 is in contact to generate a low voltage issue.

Accordingly, there is a high need for a technology capable of fundamentally eliminating these problems and minimizing the separation of the separator sheet from the unit cell in the electrode assembly manufacturing process.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

An object of the present invention, the electrode assembly manufacturing apparatus that can minimize the defects caused by low voltage issues caused by the contact between the electrodes by preventing the '1' of folding the separator sheet in the manufacturing process of the stack / folding type electrode assembly To provide.

Electrode assembly manufacturing apparatus according to the present invention for achieving this object,

An apparatus for manufacturing an electrode assembly by winding a plurality of unit cells arranged on a separator sheet together with a separator sheet,

A conveyor for introducing a separator sheet in which a plurality of unit cells are arranged in the direction of a winder and a cutter;

It is spaced apart from the conveyor, and the first unit cell located at the top of the unit cell in the running direction of the separator sheet is located in the following winder, spaced apart from the first unit cell at a predetermined distance in the traveling direction. A cutter for cutting the separator sheet;

A lower air blowing unit positioned below the cutter and configured to inject air to an end of the separator sheet so that an end of the cut separator sheet may be bent in a height direction from the ground;

Located between the conveyor and the cutter, with the end of the separator sheet bent, the first unit cell is first wound in a counterclockwise direction so that the upper surface of the first unit cell faces the ground, and is operated for a predetermined time. After waiting, a winder (winder) for sequentially stacking a plurality of unit cells in a way of repeatedly winding the first unit cell; And

The upper air blowing unit (upper) for injecting air to the end of the separator sheet so that the end of the separator sheet can be bent in the lower direction toward the ground of the first unit cell in the first unit cell is the primary winding air blowing unit);

It may be made of a structure comprising a.

Therefore, the electrode assembly manufacturing apparatus according to the present invention, in addition to the conveyor, the cutter, which is commonly used, in particular, during the primary winding, air at the end of the separator sheet so that the end of the cut separator sheet can be bent in the height direction from the ground A lower air blowing unit for spraying the lower air blowing unit; And an upper air blowing unit for injecting air to an end portion of the separator sheet so that the end portion of the separator sheet may be bent in a lower surface direction toward the ground of the first unit cell while the first unit cell is primarily wound. It is to provide an electrode assembly manufacturing apparatus capable of minimizing the "one" of the separator sheet in the manufacturing process of the assembly, thereby minimizing the failure due to low voltage issues caused by the contact between the electrodes.

In one embodiment of the present invention, the electrode assembly may be a stack / folding electrode assembly.

Specifically, the stack / foldable electrode assembly may be manufactured by arranging unit cells having a structure in which a separator is interposed between an anode and a cathode on a separator sheet, and then folding or winding the separator sheet. It may mean an electrode assembly.

In one embodiment of the present invention, the unit cell may be composed of a full cell of the anode / separator / cathode structure.

In another embodiment of the present invention, the unit cell may be made of a bicell of a cathode / separator / cathode / separator / anode structure, or a cathode / separator / anode / separator / cathode structure.

In one embodiment of the present invention, the separator sheet is 10 mm to 25 in a running direction from the first unit cell so that the end portion of the separator sheet can sufficiently contact the air injected by the upper and lower air blowing units. It can be cut at a distance of mm.

As one specific example of the winder, the winder,

A gripper for holding and fixing both side ends of the first unit cell; And

A rotating part winding the first unit cell by the gripper;

It can consist of.

The winder may be configured to primary winding the first unit cell in a size range of 160 degrees to 180 degrees so that the air injected from the upper air blowing unit can be injected in a straight line to the end of the separator sheet. In more detail, the winder may be configured to firstly wind the first unit cell in more detail in a size range of 171 degrees to 179 degrees.

In addition, the winder may be configured to wait for a time of 0.2 seconds to 1.0 seconds after the primary winding so that air can be injected to the end of the separator sheet by the upper air blowing unit for a sufficient time. The structure in which the winder waits for operation may be adjusted according to the injection amount of air injected from the upper air blowing unit, the distance and angle between the upper air blowing unit and the separator sheet.

As one specific example of the upper air blowing unit, the upper air blowing unit may include:

A nozzle for injecting air into the separator sheet;

A cylinder to which the nozzle is coupled to adjust an air injection amount;

A cylinder support coupled to the cylinder to support the cylinder; And

A sensor unit coupled to an upper portion of the cylinder and detecting a position of the nozzle and the separation membrane sheet to adjust a position of an air blowing unit;

It may be made of a structure comprising a.

In one embodiment, the separation distance between the nozzle and the separator sheet may be 20 mm to 45 mm so that the end of the separator sheet is sufficiently bent in the ground direction by the air injected from the nozzle.

In addition, an angle formed by an imaginary straight line extending from the end of the nozzle and an imaginary straight line extending from the end of the separator sheet so that the end of the separator sheet can be sufficiently bent in the ground direction by the air injected from the nozzle. May consist of 20 degrees to 45 degrees.

In addition, the upper air blowing unit has a blowing pressure of 0.1Mpa to 0.5Mpa for a time of 0.10 seconds to 0.35 seconds so that the end portion of the separator sheet is sufficiently bent in the ground direction by the air injected from the nozzle. Air can be injected downward.

The lower air blowing unit sprays air to the end of the separator sheet so that the cut end of the separator sheet can be bent in the height direction from the ground, and has a conventional compressed air blower structure.

In one embodiment of the present invention, the first unit cell may be arranged on the separator sheet in a state spaced apart from the second unit cell by the size of the width of one unit cell.

The present invention also provides an electrode assembly manufactured using the electrode assembly manufacturing apparatus.

The present invention also provides a battery cell having a structure in which the electrode assembly is embedded in a battery case together with an electrolyte.

The battery cell is not particularly limited in kind, but may be a lithium secondary battery such as a lithium ion battery, a lithium ion polymer battery, or the like having advantages of high energy density, discharge voltage, output stability, and the like.

As described above, the electrode assembly manufacturing apparatus according to the present invention, during the primary winding, the lower air blowing unit for injecting air to the end of the separator sheet so that the end of the cut separator sheet is bent in the height direction from the ground (lower air blowing unit); And an upper air blowing unit for injecting air to an end portion of the separator sheet so that the end portion of the separator sheet may be bent in a lower surface direction toward the ground of the first unit cell while the first unit cell is primarily wound. In the manufacturing process of the electrode assembly, the '1' character of the separator sheet may be prevented from being folded, thereby minimizing defects caused by contact between the electrodes.

1A is an exploded view of a conventional lithium secondary battery;

FIG. 1B is a schematic diagram of a process of manufacturing the electrode assembly of FIG. 1A; FIG.

2 is a perspective view of an electrode assembly manufacturing apparatus according to an embodiment of the present invention;

3 is a side view of the electrode assembly manufacturing apparatus of FIG. 2;

4 is a top view of the electrode assembly manufacturing apparatus of FIG. 2;

5 is a front view of the electrode assembly manufacturing apparatus of FIG. 2;

6 is a plan view of a separator sheet in which a plurality of unit cells introduced into the electrode assembly manufacturing apparatus of FIG. 2 is arranged;

7 is a perspective view of an electrode assembly manufacturing apparatus according to another embodiment of the present invention;

8 is a side view of the electrode assembly manufacturing apparatus of FIG. 7.

Hereinafter, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

Figure 2 is a perspective view of the electrode assembly manufacturing apparatus according to an embodiment of the present invention schematically, Figure 3 is a side view of the electrode assembly manufacturing apparatus of Figure 2 schematically, Figure 4 A top view of the electrode assembly manufacturing apparatus of FIG. 2 is schematically illustrated, FIG. 5 is a front view schematically showing the electrode assembly manufacturing apparatus of FIG. 2, and FIG. 6 is introduced to the electrode assembly manufacturing apparatus of FIG. 2. A plan view of a separator sheet in which a plurality of unit cells are arranged is schematically illustrated.

2 to 5, the electrode assembly manufacturing apparatus 100 includes a conveyor (not shown), a cutter (not shown), a lower air blowing unit 120, a winder 130, and an upper air blowing unit. And 140.

The electrode assembly may be a stack / foldable electrode assembly. Specifically, in the stack / foldable electrode assembly, as illustrated in FIG. 6, after arranging the unit cells 210 and 220 having a separator interposed between the anode and the cathode on the separator sheet 200, the separator The electrode assembly is manufactured by folding or winding a sheet.

The unit cell is composed of a full cell of a cathode / separation membrane / cathode structure, and according to another embodiment of the present invention, the unit cell may include an anode / separation membrane / cathode / separation membrane / anode structure, or a cathode / It may also be made of a bicell of a separator / anode / separator / cathode structure.

Conveyors and cutters have a structure and function commonly used in this field, the conveyor introduces a separator sheet 200 in which a plurality of unit cells are arranged in the direction of the winder 130, the cutter is a separator sheet 200 In the state where the first unit cell 210 positioned at the top in the traveling direction of the winder 130 is positioned by the length L spaced apart from the first unit cell 210 in the traveling direction by 10 mm to 25 mm. The membrane sheet end 201 is cut. That is, the separator sheet 200 is separated from the first unit cell 210 so that the end portion 201 of the separator sheet 200 can sufficiently contact the air injected by the

air blowing units

120 and 140. It can be cut at a separation distance L of 10 mm to 25 mm in the outward traveling direction.

The lower air blowing unit 120 injects air to the end 201 of the separator sheet 200 so that the cut end 201 of the separator sheet 200 may be bent in the height direction from the ground. The lower air blowing unit 120 has a conventional compressed air blower structure, which is not specifically illustrated in the drawings, for example, a 0.5 to 1.0 mm nozzle for an aluminum pipe having a diameter of 3 to 5 mm and a length of 250 to 350 mm. (Hole) The structure is arranged in the interval of 30 to 50 mm and attached to the scale on both sides to simplify the position movement, the pneumatic fitting condition to 6 mm and the air pressure of 0.2 to 0.5 MPa membrane sheet 200 It is preferable to spray so that the winding angle of up to 90 degrees, but is not limited thereto.

Winder 130 is a winder 130, the gripper 131 for holding both side ends of the first unit cell 210 and the rotary unit for winding the first unit cell 210 by the gripper 131 132, in which the end portion 201 of the separator sheet 200 is bent, the first unit cell 210 is rotated counterclockwise so that the upper surface of the first unit cell 210 faces the ground. After primary winding at an angle of 160 degrees to 180 degrees, more preferably at an angle of 171 degrees to 179 degrees, and waiting for operation for 0.1 to 0.3 seconds, preferably 0.2 seconds, the first unit cell 210 is repeatedly The second winding is stacked to stack a plurality of unit cells. The primary winding angle range is a position angle at which the separator end 201 touches the bottom of the separator sheet after the winding stops, and considers an angle capable of preventing vortex of the injected air.

The upper air blowing unit 140 is coupled to the nozzle 141 for injecting air to the separator sheet 200, the nozzle 141 is coupled to the cylinder 142, and the cylinder 142 for adjusting the air injection amount. The cylinder support 143 supporting the cylinder 142 and the upper portion of the cylinder 142 is coupled to sense the position of the nozzle 141 and the membrane sheet 200, to adjust the position of the air blowing unit 140 It consists of a sensor unit 144. In this case, the separation distance between the nozzle 141 and the separator sheet 200 is 20 mm to 45 mm, and the virtual straight line extending from the end of the nozzle 141 and the end of the separator sheet 200. It is preferable that the angle formed by the imaginary straight line extended from is preferably 20 degrees to 45 degrees. The upper air blowing unit 140 configured as described above has a lower surface direction in which the end portion 201 of the separator sheet 200 faces the ground of the first unit cell 210 in a state in which the first unit cell 210 is primarily wound. Membrane sheet at an injection pressure of 0.1Mpa to 0.5Mpa, more preferably 0.3Mpa to 0.4Mpa for a time period of 0.10 seconds to 0.35 seconds, more preferably 0.2 seconds to 0.25 seconds, so as to be bent. Air is injected into the end 201 of the 200.

Referring to FIG. 6, the separator sheet 200 is introduced into an electrode assembly manufacturing apparatus in an arrow direction, and the first unit cell 210 of the separator sheet 200 is one unit cell from the second unit cell 220. It is arranged on the separator sheet in a state spaced apart by the size of the width of.

7 is a perspective view schematically showing an electrode assembly manufacturing apparatus according to another embodiment of the present invention, Figure 8 is a side view of the electrode assembly manufacturing apparatus of FIG.

7 and 8, the electrode assembly manufacturing apparatus 300 includes a lower air blowing unit 320, a winder 330, and an upper air blowing unit 340.

The upper air blowing unit 340 is coupled to a nozzle 341 for injecting air to a separator sheet (not shown), a nozzle 341 is coupled, and a cylinder 342 and a cylinder 342 for adjusting the air injection amount. And a cylinder support 343 supporting the cylinder 342 and an upper portion of the cylinder 342 and detecting the position of the nozzle 341 and the separation membrane sheet to adjust the position of the air blowing unit 340. It consists of a sensor unit 344.

The rest of the structure except for the above structure is the same as that of the embodiment described with reference to FIGS. 2 to 6, and thus a detailed description thereof will be omitted.

On the other hand, the lithium secondary battery produced according to the present invention is composed of a positive electrode, a negative electrode, a separator, 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 material, and a binder to a positive electrode current collector, followed by drying, and optionally, a filler is further added to the mixture.

The positive electrode 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 , Cu ₂ V ₂ O ₇ and the like; Ni-site type lithium nickel oxide represented by the formula LiNi ₁ _- _x M _x O ₂ , wherein 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 (wherein M = Co, Ni, Fe, Cr, Zn or Ta and x = 0.01 to 0.1) or Li ₂ Mn ₃ MO ₈ (wherein M = Fe, Co, Lithium manganese composite oxide represented by Ni, Cu or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with alkaline earth metal ions; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ and the like, but are not limited to these.

The conductive material 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 material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder 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 a component that assists the bonding of the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 30 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, 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 inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery. Examples of the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.

The negative electrode is manufactured by coating and drying a negative electrode active material on a negative electrode current collector, and optionally, the components as described above may optionally be further included.

As said negative electrode active material, For example, carbon, such as hardly graphitized carbon and graphite type 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 ': Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 <x≤1;1≤y≤3; 1≤ metal composite oxides such as z ≦ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; 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 metal oxides such as Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separator and the separator are 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 from 0.01 to 10 ㎛㎛, thickness is generally 5 ~ 130 ㎛. As such a separator, for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets or non-woven fabrics made of glass fibers or polyethylene are used. When a solid electrolyte such as a polymer is used as the electrolyte, the solid electrolyte may also serve as a separator.

In addition, in one specific example, in order to improve the safety of the battery, the separator and / or the separator may be an SRS (Safety-Reinforcing Separators) separator of organic / inorganic composite porous.

The SRS separator is manufactured using inorganic particles and a binder polymer as an active layer component on a polyolefin-based separator substrate, wherein the pore structure included in the separator substrate itself and the interstitial volume between the inorganic particles as the active layer component are used. It has a uniform pore structure formed.

In the case of using the organic / inorganic composite porous membrane, an increase in battery thickness due to swelling during the formation process can be suppressed as compared with a conventional separator. In the case of using a gelable polymer when impregnating a liquid electrolyte, it may be used simultaneously as an electrolyte.

In addition, the organic / inorganic composite porous separator may exhibit excellent adhesion characteristics by controlling the content of the inorganic particles and the binder polymer, which are the active layer components in the separator, and thus may have an easy battery assembly process.

The inorganic particles are not particularly limited as long as they are electrochemically stable. That is, the inorganic particles that can be used in the present invention are not particularly limited as long as the oxidation and / or reduction reactions do not occur in the operating voltage range of the battery to be applied (for example, 0 to 5 V on the basis of Li / Li +). In particular, in the case of using the inorganic particles having the ion transfer ability, since the ion conductivity in the electrochemical device can be improved to improve the performance, it is preferable that the ion conductivity is as high as possible. In addition, when the inorganic particles have a high density, it is not only difficult to disperse during coating, but also has a problem of weight increase during battery manufacturing, and therefore, it is preferable that the density is as small as possible. In addition, in the case of an inorganic material having a high dielectric constant, it is possible to contribute to an increase in the degree of dissociation of an electrolyte salt such as lithium salt in the liquid electrolyte, thereby improving the ionic conductivity of the electrolyte.

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

As said non-aqueous liquid electrolyte solution, N-methyl- 2-pyrrolidinone, a propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma, for example Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be used.

Examples of the organic solid electrolyte include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymers containing ionic dissociating 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, 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 good material to be dissolved 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.

In addition, for the purpose of improving charge / discharge characteristics, flame retardancy, etc., the non-aqueous electrolyte solution includes, for example, pyridine, triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, and hexaphosphate triamide. Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride, etc. It may be. In some cases, in order to impart nonflammability, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics.

Although described with reference to the drawings according to an embodiment of the present invention, those of ordinary skill in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

Claims

An apparatus for manufacturing an electrode assembly by winding a plurality of unit cells arranged on a separator sheet together with a separator sheet,

A conveyor for introducing a separator sheet in which a plurality of unit cells are arranged in the direction of a winder and a cutter;

It is spaced apart from the conveyor, and the first unit cell located at the top of the unit cell in the running direction of the separator sheet is located in the following winder, spaced apart from the first unit cell at a predetermined distance in the traveling direction. A cutter for cutting the separator sheet;

A lower air blowing unit positioned below the cutter and configured to inject air to an end of the separator sheet so that an end of the cut separator sheet may be bent in a height direction from the ground;

Located between the conveyor and the cutter, with the end of the separator sheet bent, the first unit cell is first wound in a counterclockwise direction so that the upper surface of the first unit cell faces the ground, and is operated for a predetermined time. After waiting, a winder (winder) for stacking a plurality of unit cells by repeatedly winding the first unit cell; And

The upper air blowing unit (upper) for injecting air to the end of the separator sheet so that the end of the separator sheet can be bent in the lower direction toward the ground of the first unit cell in the first unit cell is the primary winding air blowing unit);

Electrode assembly manufacturing apparatus comprising a.
The electrode assembly manufacturing apparatus of claim 1, wherein the electrode assembly is a stack / foldable electrode assembly.
The electrode assembly manufacturing apparatus of claim 2, wherein the unit cell is a full cell of a cathode / separator / cathode structure.
The electrode assembly manufacturing apparatus according to claim 2, wherein the unit cell is a bicell having an anode / separator / cathode / separator / anode structure, or a cathode / separator / anode / separator / cathode structure.
The electrode assembly manufacturing apparatus of claim 1, wherein the separator sheet is cut at a distance of 10 mm to 25 mm in a traveling direction from the first unit cell.
The method of claim 1, wherein the winder,

A gripper for holding and fixing both side ends of the first unit cell; And

A rotating part winding the first unit cell by the gripper;

Electrode assembly manufacturing apparatus, characterized in that consisting of.
The electrode assembly manufacturing apparatus of claim 1, wherein the winder first winds the first unit cell in a size range of 160 degrees to 180 degrees.
The electrode assembly manufacturing apparatus of claim 1, wherein the winder waits for an operation of 0.2 seconds to 1.0 seconds after the primary winding.
The method of claim 1, wherein the upper air blowing unit,

A nozzle for injecting air into the separator sheet;

A cylinder to which the nozzle is coupled to adjust an air injection amount;

A cylinder support coupled to the cylinder to support the cylinder; And

A sensor unit coupled to an upper portion of the cylinder and detecting a position of the nozzle and the separation membrane sheet to adjust a position of an air blowing unit;

Electrode assembly manufacturing apparatus comprising a.
10. The apparatus of claim 9, wherein the separation distance between the nozzle and the separator sheet is 20 mm to 45 mm.
The electrode assembly manufacturing apparatus of claim 9, wherein an angle formed by the virtual straight line extending from the end of the nozzle and the virtual straight line extending from the end of the separator sheet is 20 degrees to 45 degrees.
The air blowing unit of claim 1, wherein the lower air blowing unit is sprayed to the separator sheet at an air pressure of 0.2 to 0.5 MPa such that the winding angle of the separator sheet 200 rises to 90 degrees, and the upper air blowing unit is 0.10 to the separator sheet. Electrode assembly manufacturing apparatus characterized in that for injecting the air downward for a time of seconds to 0.35 seconds and the injection pressure of 0.1Mpa to 0.5Mpa.
The electrode assembly manufacturing apparatus according to claim 1, wherein the first unit cell is arranged on the separator sheet in a state spaced apart from the second unit cell by the width of one unit cell.
An electrode assembly, which is manufactured using the electrode assembly manufacturing apparatus according to claim 1.
A battery cell comprising the electrode assembly according to claim 14 together with an electrolyte in a battery case.