WO2023043230A1 - 이차전지 제조장치 및 이를 이용하는 이차전지 제조방법 - Google Patents
이차전지 제조장치 및 이를 이용하는 이차전지 제조방법 Download PDFInfo
- Publication number
- WO2023043230A1 WO2023043230A1 PCT/KR2022/013798 KR2022013798W WO2023043230A1 WO 2023043230 A1 WO2023043230 A1 WO 2023043230A1 KR 2022013798 W KR2022013798 W KR 2022013798W WO 2023043230 A1 WO2023043230 A1 WO 2023043230A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- pressing
- unit
- secondary battery
- laminate
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 93
- 238000003825 pressing Methods 0.000 claims abstract description 168
- 239000007772 electrode material Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000003475 lamination Methods 0.000 claims description 4
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 239000011267 electrode slurry Substances 0.000 description 22
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 239000011888 foil Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011532 electronic conductor Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0468—Compression means for stacks of electrodes and separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method using the same, and more particularly, it is possible to improve the non-adhesive area of an electrode and a separator inside an electrode unit and the non-adhesive area of an electrode unit and a separator sheet inside an electrode assembly. It relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method using the same.
- a cell or battery which generates electrical energy through physical or chemical reactions of materials and supplies power to the outside, may not be able to obtain AC power supplied to buildings depending on the living environment surrounded by various electrical and electronic devices. It is used in cases where direct current power is required.
- primary batteries and secondary batteries which are chemical batteries using chemical reactions, are generally used.
- Primary batteries are collectively referred to as dry batteries and are consumable batteries.
- a secondary battery is a rechargeable battery manufactured using a material in which an oxidation-reduction process between an electric current and a material can be repeated many times. When a reduction reaction for the material is performed by an electric current, power is charged and an oxidation reaction for the material is performed. When the power is discharged, electricity is generated as such charge-discharge is repeatedly performed.
- an electrode is manufactured by coating an electrode slurry in which an active material, a conductive material, and a binder are mixed to a predetermined thickness on a positive electrode conductive foil and a negative electrode conductive foil, respectively, and between the two conductive foils
- An electrode unit may be manufactured by interposing a separator therebetween.
- secondary batteries may be classified according to their structures.
- an electrode assembly is manufactured by winding a long sheet-shaped electrode unit in the form of a large amount of jelly roll multiple times with a separator sheet interposed therebetween, and the manufactured electrode assembly is stored in a cylindrical can, etc.
- a cylindrical secondary battery manufactured by sealing this and electrode units of a predetermined size are folded so as to be stacked with a separator sheet interposed therebetween to produce an electrode assembly, and storing the manufactured electrode assembly in a pouch to seal it. It can be classified as a pouch-type secondary battery and the like.
- the electrode slurry is non-uniformly applied to the conductive foil due to the viscosity of the electrode slurry, resulting in a difference in coating thickness of the electrode slurry.
- the difference in coating thickness of the electrode slurry formed an unbonded area between the electrode and the separator inside the electrode unit manufactured including the electrode.
- the pouch-type secondary battery is manufactured by stacking electrode units on a separator sheet, an unbonded region is formed inside the electrode assembly including the electrode units.
- the unbonded area as described above causes precipitation of lithium due to interfacial resistance of the cathode, thereby increasing the resistance of the electrode.
- the present invention has been made to solve the above problems, and an object of the present invention is to improve the non-adhesive area of the electrode and the separator inside the electrode unit and the non-adhesive area of the electrode unit and the separator sheet inside the electrode assembly. It is to provide a battery manufacturing device and a secondary battery manufacturing method.
- the pressurizing unit includes: a main pressurizing unit for pressing the entire surface of the laminate; and a sub-pressing unit having a drum unit that presses a portion of the entire surface of the stack where the edge portion of the electrode active material layer provided in the electrode is located among the entire surface;
- the drum unit may include a body portion having a rotating shaft; and an elastic part provided on an outer circumferential surface of the body and pressurizing a portion of a surface of the laminate.
- the edge portion of the electrode active material is formed in a curved surface whose height decreases toward the end, and the drum portion may press so that the edge portion of the electrode active material layer and the separator are adhered to each other.
- the elastic part may be provided to be elastically deformable.
- the elastic part may have an internal space, and air or fluid may be filled in the internal space to maintain a preset pressure.
- the elastic part may be made of deformable synthetic resin, and the synthetic resin may be made of silicone rubber.
- the shape of the sub-pressing part may be deformed only when the partial surface is pressed.
- the secondary battery manufacturing apparatus may include a pressure detection unit that detects pressure applied by the sub-pressing unit to the partial surface of the laminate.
- the pressure detection unit may include a sensor unit for sensing pressure; and a display unit displaying the pressure sensed by the sensor unit.
- the sensor unit may be disposed to face the sub-pressing unit with the partial surface of the laminated body interposed therebetween.
- the laminate includes electrode tabs connected to the electrodes;
- the sub-pressing unit may press a portion of a surface of the laminate to which the electrode tab is connected and where an edge portion of an electrode active material layer provided in the electrode is located.
- the sub-pressing unit may be disposed at least one of a front side and a rear side of the main pressing unit.
- the secondary battery manufacturing apparatus includes a heating unit disposed behind the pressing unit and applying heat to the laminate in which the electrode and the separator are stacked;
- the sub pressing part may be disposed between the heating part and the main pressing part.
- the edge portion is provided at both ends of the electrode active material layer provided in the electrode, and the drum portion presses only a portion of the laminated body where the edge portion provided at both ends of the electrode active material layer is located. can be provided.
- the edge portion is provided at both ends of the electrode active material layer provided in the electrode, and the drum portion presses a surface including a partial surface of the stack where the edge portion provided at both ends of the electrode active material layer is located. can do.
- the sub-pressing unit may further include a pressure sensor for measuring the pressure of air or fluid filled in the inner space of the elastic unit.
- the sub-pressing part may further include an injection part for injecting air or fluid into an inner space of the elastic part through the body part.
- the present invention comprises an electrode unit manufacturing step of manufacturing an electrode unit in which an electrode and a separator are disposed; An electrode assembly manufacturing step of manufacturing an electrode assembly by disposing a separator sheet between the plurality of electrode units manufactured in the electrode unit manufacturing step; and an electrode assembly pressing step of pressurizing the electrode assembly, wherein the electrode unit manufacturing step includes: a lamination step of making a laminate by alternately arranging the separator and the electrode; and an bonding step of bonding the separator and the electrode included in the laminate;
- the bonding step may include an entire surface pressing step of pressing the entire surface of the laminate; and a first partial pressing step of pressing a portion of the entire surface of the laminate where an edge portion of the electrode active material layer provided in the electrode is located among the entire surface.
- the pressing of the electrode assembly may include a second front pressing step of pressing the entire surface of the electrode assembly; and a second partial pressing step of pressing a partial surface of the electrode assembly, on which an edge portion of an electrode active material layer provided in the electrode is located, among the entire surface of the electrode assembly.
- a secondary battery manufacturing apparatus and a secondary battery manufacturing method using the same according to the present invention pressurizes a portion of the front surface of the laminate, on which the edge portion of the electrode active material layer provided in the electrode of the laminate is located, by using a sub-pressing unit, so that the inside of the laminate is There is an advantage of improving the unbonded area.
- the secondary battery manufacturing apparatus has the advantage of being able to respond to various sizes and shapes of some of the front surfaces of the laminate without replacing the sub-pressing part by using the sub-pressing part including the elastic part.
- the secondary battery manufacturing apparatus includes a pressure detector, so that the sub-pressurizer detects the pressure applied to the laminate and easily manages fairness according to the model and process environment of the laminate based on the detected pressure.
- 1A is a perspective view showing a laminate of the present invention.
- FIG. 1B is a side view showing a state in which the laminate of FIG. 1A is viewed from the side.
- FIG. 2 is a plan view showing a state of looking down from above the secondary battery manufacturing apparatus according to the first embodiment of the present invention.
- FIG. 3 is a side view showing the secondary battery manufacturing apparatus of FIG. 2 viewed from the side.
- FIG. 4A is a side view showing a side of the sub-pressing unit in the secondary battery manufacturing apparatus of FIG. 2 in more detail.
- FIG. 4B is a front view illustrating the drum part of the sub-pressing unit in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 4C is a side view illustrating the drum part of the sub-pressing unit in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 5A is an enlarged view showing in more detail how an elastic part presses a laminate of a shape in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 5B is an enlarged view showing in more detail how the elastic part presses a laminate having a different shape in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 5C is an enlarged view showing in more detail how the elastic part presses a laminate having another shape in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 5D is an enlarged view showing in detail a state in which the sub-pressing unit presses the laminate in the secondary battery manufacturing apparatus of FIG. 2 according to another embodiment.
- FIG. 6 is a perspective view showing in more detail the appearance of the sub-pressing unit and the pressure detection unit in the secondary battery manufacturing apparatus of FIG. 2 .
- FIG. 7 is an image showing a comparison of the formation of unbonded regions of bi-cells manufactured by a conventional secondary battery manufacturing apparatus (a) and a secondary battery manufacturing apparatus (b) according to the present invention.
- the present invention may provide a secondary battery manufacturing apparatus including a pressing unit 100 for pressing the laminate 10 in which the electrode 101 and the separator 102 are stacked.
- the laminate 10 has a structure in which the electrode 101 and the separator 102 are stacked, and various configurations are possible.
- the laminate 10 is an electrode unit in which the electrode 101 and the separator 102 are stacked, that is, a unit cell, and may mean any one of bi-cell, mono-cell, and full-cell, It may mean an electrode assembly in which a plurality of electrode units (unit cells) in which the electrode 101 and the separator 102 are stacked and the separator sheet 20 are stacked.
- the electrode 101 includes an electrode current collector 1011 and an electrode active material layer 1012 coated on a surface of the electrode current collector 1011 .
- the electrode assembly may have any structure as long as it has a structure in which a plurality of electrode units and a separator sheet are stacked.
- the electrode assembly may have a structure in which a plurality of electrode units are arranged or arranged on a separator sheet.
- the electrode assembly may have a structure in which a plurality of electrode units are arranged or lined up on a separator sheet, and then the electrode units and the separator sheet are alternately stacked and folded.
- the laminate 10 may be pressed by a pressing unit 100 to be described later in order to bond the electrode and the separator, and the electrode unit and the separator sheet to each other.
- the entire surface of the laminate 10 provided to face the pressing unit 100 and pressed may be defined as the entire surface 11 .
- the entire surface 11 may have a height difference.
- the surface formed with a relatively low height among the entire surface 11 is difficult to pressurize during the pressurization process, it remains as an unbonded area where the electrode-separator or electrode unit-separator sheet is not bonded, which is the cause of lithium precipitation on the negative electrode interface. This can be.
- the entire surface 11 of the laminate 10 includes a partial surface 12 including a surface formed with a relatively low height
- the electrode slurry may be uniformly applied on the electrode current collector to include the remaining surface 13 having a constant height.
- the dotted line shown in the laminate 10 is to distinguish a part of the surface 12 and the remaining surface 13, and does not mean that the internal structure of the laminate 10 is separated.
- the partial surface 12 is a surface including a surface formed with relatively low height among the entire surface 11 of the laminate 10 because less electrode slurry is applied on the electrode current collector, and can be configured in various ways there is.
- the partial surface 12 is a surface in which a height difference is formed, and as shown in FIG. 1B, a first partial surface 12a having a relatively low height among the entire surface 11, and the first It may include a second partial surface 12b formed higher than the height of the partial surface 12a.
- the first partial surface 12a is a surface formed with a relatively low height among the entire surface 11, and the edge portion 1013 of the electrode active material layer 1012 provided on the electrode 101 among the entire surface 11 is It may be the surface of the laminate 10 located thereon.
- the edge portion 1013 of the electrode active material layer 1012 is formed as a curved surface whose height decreases toward the end as the electrode slurry flows, and the edge portion 1013, which is a curved surface, provides The surface will have a low height. Accordingly, a non-adhesive state is maintained between the edge portion 1013 of the electrode active material layer 1012 and the separator 102 corresponding to each other.
- a technical feature of the present invention is to bond between the edge portion 1013 of the non-adhered electrode active material layer and the separator 102.
- the second partial surface 12b is a surface formed higher than the first partial surface 12a, and the size of the stack 10 for each model and the degree of non-uniform application of the electrode slurry in the stack 10 Accordingly, it may be formed in various directions based on the first partial surface 12a.
- the second partial surface 12b may be formed between the first partial surface 12a and the remaining surface 13 .
- the formation of the second partial surface 12b is not limited thereto, and may be formed in various ways, such as surrounded by the first partial surface 12a or formed while surrounding the first partial surface 12a. Of course you can.
- the partial surface 12 may be composed of only the first partial surface 12a having a relatively low height among the entire surface 11 .
- the partial surface 12 may be located anywhere on the laminate 10 .
- the electrode slurry less easily reaches the edge of the electrode current collector when the electrode slurry is applied, so that the partial surface 12 corresponds to the edge of the laminate 10 It can be positioned as possible.
- the partial surface 12 may be positioned to correspond to the edge region of the laminate 10 where the electrode tab 14 is located.
- the edge area of the laminate 10 originally corresponding to the central portion of the electrode current collector is relatively less easily reached by the electrode slurry.
- the electrode tab 14 may be connected to the electrode by being formed on the electrode current collector through a notching process before the electrode slurry is coated or attached to any part of the electrode current collector after the electrode slurry is coated. .
- the pressing unit 100 is a configuration for pressing the laminate 10, and various configurations are possible.
- the pressing unit 100 As shown in Figures 2 and 3, the main pressing unit 110 for pressing the entire surface 11 of the laminate 10; and a sub-pressing unit 120 that presses the partial surface 12 of the laminate 10 .
- the main pressing unit 110 is configured to press the entire surface 11 of the laminate 10, and various configurations are possible.
- the main pressing unit 110 may be composed of a roller for pressing while rotating the laminate 10 or a press for pressing while moving the laminate 10 in a vertical direction.
- the main pressing part 110 when the laminate 10 is an electrode unit, the main pressing part 110 may be provided as a roller, and when the laminate 10 is an electrode assembly, the main pressing part 110 ) may be provided with a press.
- the sub-pressing unit 120 is configured to press a portion of the surface 12 of the laminate 10, and various configurations are possible.
- the sub-pressing part 120 is disposed on at least one of the front and rear sides of the main pressing part 110, before and/or the entire surface 11 of the laminate 10 is pressed. After pressing (11), some surfaces 12 of the laminate 10 may be pressed. Accordingly, the sub-pressing part 120 presses the portion of the surface 12 where the edge part 1013 of the electrode active material layer 1012 provided in the electrode 101 is located, so that the unbonded area of the laminate 10, That is, the edge portion 1013 of the electrode active material layer and the unbonded area of the separator 102 may be bonded to each other.
- a direction toward the moving direction on the conveyor belt of the laminate 10 may be referred to as a front, and a direction opposite to the front may be referred to as a rear.
- the sub-pressing part 120 is the laminate 10 where the edge 1013 of the electrode active material layer provided in the electrode is located on the entire surface of the laminate 10.
- the drum part 121 is configured to rotate and press the partial surface 12 of the laminate 10, and various configurations are possible.
- the laminate 10 is formed in various lengths and widths for each model, and the region where the electrode slurry is applied unevenly is formed irregularly for each laminate 10,
- the area of the surface (eg, the first partial surface 12a) of the front surface 11 having a relatively low height may be formed in various sizes for each individual laminate 10 .
- the drum part 121 of the sub-pressing part 120 is made of only a hard material (ex. steel) and the shape of the part of the surface 12 cannot be deformed during pressing, the drum part 121 is the entire surface. (11), it is unable to respond to various sizes and shapes of surfaces formed with a relatively low height. Accordingly, the inconvenience of having to replace the sub-pressing unit 120 repeatedly in consideration of this may occur.
- the edge portion ( 1013) constitutes a drum unit 121 capable of responding to various changes in the partial surface 12 of the laminate, and the drum unit 121 will be described in detail below.
- the drum part 121 is provided to be fixedly coupled along the outer circumferential surface of the body part 121a having the rotating shaft 122 and the body part 121a, and is elastic.
- An elastic part 121b provided to be deformable may be included.
- the body portion 121a is configured to be coupled to the rotating shaft 122, and various configurations are possible.
- the elastic part 121b rotates in conjunction with the body part 121a. while pressing the part surface 12 of the laminate 10 where the edge portion 1013 of the electrode active material layer is located.
- the elastic part 121b is deformed according to the shape of the laminate 10 that is deformed when the partial surface 12 of the laminate 10 is pressed, stably stably covering the entire partial surface 12 of the laminate 10. It can be pressurized, and in particular, it is possible to bond the unbonded area of the edge portion 1013 of the electrode active material layer and the separator 102 corresponding to each other.
- the body portion 121a is configured to rotate the drum portion 121 by receiving rotational force from the rotating shaft 122, and may have various shapes.
- the body portion 121a may have a cylindrical cylinder shape, a wheel shape having a plurality of spokes, and the like.
- the elastic part 121b is provided to be fixedly coupled along the outer circumferential surface of the body part 121a and is elastically deformable, and various configurations are possible.
- the elastic part 121b is formed with an inner space 121c, and air or air is used in the inner space 121c to maintain a preset pressure. It has a structure filled with fluid.
- the elastic part 121b may have the shape of a bicycle wheel filled with air.
- the elastic part 121b corresponds to various changes in the partial surface of the laminate where the edge portion of the electrode active material layer is located among the entire surface 11 will be described in detail.
- the width of the partial surface 12, the width of the first partial surface 12a, and the width of the drum unit 121, which will be described later, can be understood as a width in which the conveyor belt traveling direction of the laminate 10 is the longitudinal direction. there is.
- the elastic part 121b has an elastic material capable of changing the shape of the pressure surface when the partial surface 12 is pressed, so that the drum part 121 is the edge portion of the electrode active material layer among the entire surface 11 It may correspond to various changes of the part surface 12 of the laminate 10 where 1013 is located.
- the elastic portion 121b may cause the portion of the surface 12 )
- the pressing surface of the elastic part 121b for pressing may be deformed stepwise to correspond to the shape of the partial surface 12. Accordingly, the sub-pressing unit 120 may press all parts of the partial surface 12 including the first partial surface 12a and the second partial surface 12b.
- the drum unit 121 in the case of a laminate 10 in which two electrode tabs 14 are drawn out in both directions of the electrode, respectively, the electrode active material layer 1012
- the edge portion 1013 is provided at both ends of the electrode active material layer provided in the electrode, and accordingly, the edge portion 1013 provided at both ends of the electrode active material layer is located in the laminate 10 It may be provided as a pair to press some of the surfaces 12, respectively. That is, the pair of drum parts 121 may press the partial surfaces 12 located on both sides of the stack, respectively.
- the elastic part 121b spreads in the width direction of the part of the surface 12, so that the pressure surface of the elastic part 121b spreads in the width direction of the part of the surface 121. All parts of (12) can be pressurized.
- the drum unit 121 in the case of a laminate 10 in which two electrode tabs 14 are drawn out in both directions of the electrode, respectively, both ends of the electrode active material layer It is possible to press the entire surface including the partial surface 12 of the laminate 10 where the edge portion 1013 provided on each is located. That is, it is possible to press the entire surface including a partial surface of the stack where the edge part is located with one drum unit 121 .
- the sub-pressing unit is disposed to correspond to the upper and lower surfaces of the laminate 10, and can simultaneously press the upper and lower portions of some surfaces 12 of the laminate.
- the sub-pressing unit disposed below the stack is referred to as a lower sub-pressing unit 120'
- the sub-pressing unit disposed above the stack is referred to as an upper sub-pressing unit 120". That is, in a state in which the lower sub-pressing part 120' is supported on the lower part of the partial surface 12 of the laminate 10, the upper western pressing part 120' presses the upper part of the partial surface of the laminated body. Then, some surfaces of the laminate located between the upper and lower sub-pressing parts are pressed, and as a result, more effectively than some surfaces of the laminate 10 where the edge parts 1013 provided at both ends of the electrode active material layer are located. can be pressurized.
- the elastic part 121b may have various materials capable of being elastically deformed.
- the elastic part 121b may be made of a deformable synthetic resin, and the synthetic resin may have a material including any one of silicone rubber.
- the shape of the elastic part 121b of the sub-pressing part 120 may be deformed only when the partial surface is pressed. Also, the elastic part 121b may have various structures.
- the elastic part 121b may have a pad structure made of only an elastic material and have a predetermined thickness.
- the elastic part 121b may have an inner space, and the inner space may be formed.
- the space may have a tire structure filled with air or fluid to maintain a preset pressure.
- the preset pressure may be a predetermined pressure value that allows the elastic portion 121b to be elastically deformed along with pressing the partial surface 12 .
- the preset pressure may be variously set by the user according to the material and size of the elastic part 121b, and the sub-pressing part 120 may be set by the pressure detector 300 to be described later. ) Of course, it may be adjusted by receiving feedback of the pressure value for pressing the part of the surface 12.
- the sub pressurization part 120 may further include a pressure sensor 123 for measuring the pressure of air or fluid filled in the inner space of the elastic part 121b.
- the pressure sensor 123 may be provided in a through hole formed in the body portion 121a and connected to the inside of the elastic portion 121b. Accordingly, the internal pressure of the elastic part 121b can be easily checked even from the outside.
- the sub-pressing part 120 may further include an injection part 124 for injecting air or fluid into the inner space of the elastic part 121b through the body part 121a. Accordingly, when the internal pressure of the elastic part 121b is low or high, it can be injected or discharged through the injection part 124 to keep it constant.
- the sub-pressing part 120 can be of any configuration as long as the shape can be deformed when the partial surface 12 is pressed, and is not limited to the case of having the aforementioned elastic part 121b.
- the rotating shaft 122 is coupled to the drum unit 121 to rotate the drum unit, and various configurations are possible.
- one end of the rotating shaft 122 is connected to a driving motor to receive rotational force, and the rotational force of the driving motor can be transmitted to the aforementioned body portion 121a.
- the rotating shaft 122 may include a bearing (not shown) provided while surrounding an outer circumferential surface of the rotating shaft 122 between the rotating shaft 122 and the body portion 121a.
- the secondary battery manufacturing apparatus may further include a pressure detector 300 as shown in FIG. 6 .
- the pressure detection unit 300 is a component that detects the pressure applied by the sub-pressing unit 120 to the partial surface 12 of the laminate 10, and various configurations are possible.
- the user of the secondary battery manufacturing apparatus detects the pressure with which the sub-pressing unit 120 presses the stack 10 through the pressure detection unit 300, so that each stack 10 model, There is an advantage in that processability can be managed according to each model of the laminate 10 and each process environment by using pressure data applied for each process environment.
- the pressure detector 300 may be disposed in various positions.
- the pressure detection unit 300 may be disposed below the conveyor belt at a position corresponding to the sub-pressing unit 120 .
- the pressure detection unit 300 as shown in Figure 6, the sensor unit 310 for sensing the pressure; and a display unit 320 displaying the pressure sensed by the sensor unit 310 .
- the sensor unit 310 is a component that senses pressure, and various configurations are possible.
- the sensor unit 310 may include a mechanical, electronic, or semiconductor type pressure sensor that detects pressure, and various types of pressure sensors may be used depending on the required pressure range and pressure measurement environment.
- the sensor unit 310 may be disposed in various positions. However, in order to measure the pressure applied to the partial surface 12 when the sub-pressing unit 120 presses the partial surface 12, the sensor unit 310, as shown in FIG. , It is preferable to face the sub-pressing part 120 with the partial surface 12 of the laminate 10 interposed therebetween. That is, the sensor unit 310 may be disposed on a line through which the partial surface 12 of the laminate 10 passes.
- the display unit 320 is configured to display the pressure sensed by the sensor unit 310, and various configurations are possible.
- the display unit 320 may have any configuration as long as it is configured to provide the user with the pressure data sensed by the sensor unit 310, and for example, a display capable of outputting the pressure data as an image ( display) device.
- the secondary battery manufacturing apparatus may further include a heating unit 200 for applying heat to the laminate 10 in which the electrode and the separator are laminated.
- the heating unit 200 is disposed behind the pressing unit 100 and applies heat to the laminate 10 in which the electrode and the separator are stacked, and various configurations are possible.
- the rear may refer to a direction opposite to a direction in which the laminate 10 travels on the conveyor belt.
- the heating unit 200 is disposed behind the pressing unit 100, and may apply heat to the stack 10 before the pressing unit 100 presses the stack 10. . That is, as the temperature of the laminate 10 increases, the adhesion between the electrode and the separator is improved, and wrinkles formed on the electrode, the separator, and the separator sheet inside the laminate during the manufacturing process can be improved.
- the laminate 10 may be heated to a temperature higher than room temperature.
- the meaning of the room temperature refers to a temperature range referred to as 'room temperature' or room temperature in the art. In other words, it refers to the temperature of a laboratory, laboratory, etc., especially when an experiment is conducted without specifying or adjusting the temperature, or when samples and substances are left indoors.
- As an expression of temperature conditions it refers to the indoor air temperature. . Generally, it is a temperature at which humans can comfortably live, and is usually around 15°C to 20°C.
- the sub-pressing unit 120 may be disposed in various positions, but when the sub-pressing unit 120 presses a portion of the surface 12 while the laminate 10 is heated. , Since the unbonded area inside the laminate 10 can be improved more effectively, the sub pressing part 120, as shown in FIGS. 2 and 3, the heating part 200 and the main pressing part ( 110) may be preferable.
- the secondary battery manufacturing method of the present invention includes an electrode unit manufacturing step of manufacturing an electrode unit in which an electrode and a separator are stacked; An electrode assembly manufacturing step of manufacturing an electrode assembly in which the plurality of electrode units and the separator sheet manufactured in the electrode unit manufacturing step are stacked; and an electrode assembly pressing step of pressurizing the electrode assembly.
- the electrode unit manufacturing step is a step of manufacturing an electrode unit in which the electrode 101 and the separator 102 are stacked, and may be performed in various ways.
- the electrode unit manufacturing step may include a lamination step of forming a laminate 10 by laminating the electrode 101 on the separator 102; An bonding step of bonding the separator and the electrode in the laminate 10 may be included.
- the lamination step is a step of making the laminate 10 by laminating the electrode 101 on the separator 102, and may be performed in various ways.
- the electrode 101 includes an electrode current collector 1011 and an electrode active material layer 1012 coated on the electrode current collector 1011 . That is, the electrode 101 can manufacture an anode or cathode electrode by applying the electrode slurry on the electrode current collector (conductive foil) 1011 and coating it on the electrode current collector 1011, and a separator between the electrodes It can be performed by laminating through.
- the electrode slurry may be non-uniformly coated on the electrode current collector. That is, the electrode slurry is irregularly coated on the edge portion 1013 of the electrode active material layer 1012 coated on the electrode, and accordingly, the edge portion 1013 of the electrode active material layer 1012 has a curved surface whose height decreases toward the end. is formed
- the bonding step is a step of bonding the separator and the electrode in the laminate, and may be performed in various ways.
- the bonding step may include a first front pressing step of pressing the front surface of the laminate 10; and a first partial pressing step of pressing the partial surfaces 12 having height differences in the laminate.
- the first front pressing step is a step of pressing the entire surface 11 of the laminate 10, and may be performed in various ways.
- the first front pressing step may be performed by pressing the entire surface 11 of the laminate 10 through the main pressing unit 110 described above.
- the electrode slurry is non-uniformly coated on the electrode current collector, a difference in height occurs on the front surface of the laminate 10, and there is an unadhesive area on the partial surface 12 of the laminate where the edge of the electrode active material layer is located. can occur (see Fig. 1b).
- the first partial surface pressing step is a step of pressing the partial surface 12 of the laminate 10 where the edge portion 1013 of the electrode active material layer 1012 is located, and may be performed in various ways. there is.
- the first partial surface pressing step may be performed by pressing the partial surface 12 of the laminate 10 through the sub-pressing unit 120 .
- the detailed configuration and effects of the sub-pressing unit 120 may be substituted for the above description.
- the first partial surface pressing step the partial surface 12 of the laminate 10 is additionally pressed to form a gap between the edge portion 1013 of the electrode active material layer of the laminate 10 and the separator 102. It is possible to bond the unbonded area of At this time, of course, the first partial surface pressing step may be performed not only after performing the first front pressing step but also before performing the first front pressing step.
- the electrode assembly manufacturing step is a step of manufacturing an electrode assembly in which a plurality of electrode units manufactured in the electrode unit manufacturing step and a separator sheet are stacked, and may be performed in various ways.
- the electrode assembly may also be understood as a configuration corresponding to the above-described laminate 10, but in order to distinguish it from the electrode unit above, the electrode assembly will be described below.
- the electrode units manufactured in the above-described electrode unit manufacturing step are arranged side by side on a separator sheet to prepare an electrode assembly, or after arranging the electrode units side by side on a separator sheet, the electrode unit And the electrode assembly may be manufactured by folding the separator sheets so that the separator sheets are alternately stacked.
- a specific region of the electrode unit may have a relatively low height compared to other regions. Therefore, when manufacturing the electrode assembly, when the electrode units are arranged and stacked in parallel in one direction, an unbonded area between the electrode units and the separator sheet may be formed, and a surface located at a relatively low height among the front surfaces of the electrode assembly. can be formed.
- the pressing of the electrode assembly is a step of pressing the electrode assembly, and may be performed in various ways.
- the pressing of the electrode assembly may include a second front pressing step of pressing the front surface of the electrode assembly; and a second partial pressing step of pressing a partial surface of the electrode assembly having a height difference formed on an outer surface of the electrode assembly.
- the second front pressing step is a step of pressing the front surface of the electrode assembly, and may be performed in various ways.
- the second front pressing step may be performed by pressing the entire surface of the electrode assembly through the main pressing unit 110 described above.
- a difference in height occurs on the front surface of the electrode assembly as described above, an unbonded area may occur on some surfaces including surfaces with a relatively low height among the entire surfaces.
- the second partial surface pressing step is a step of pressing a partial surface on which a height difference is formed on the outer surface of the electrode assembly, and may be performed in various ways.
- the second partial surface pressing step may be performed by pressing a partial surface of the electrode assembly where the edge portion of the electrode active material layer is located through the sub-pressing unit 120 .
- the detailed configuration and effects of the sub-pressing unit 120 may be substituted for the above description.
- the non-adhesive area of the electrode assembly may be improved by additionally pressing a partial surface of the electrode assembly.
- the second partial surface pressing step may be performed not only after performing the second front pressing step but also before performing the second front pressing step.
- the laminate is a bi-cell
- a front image of the bi-cell manufactured according to the prior art hereinafter referred to as “comparative example”
- an embodiment of the present invention A front image of a bi-cell manufactured according to the present invention
- the black electrode-separator non-adhesive area on the upper part of the bi-cell that is, the edge portion B corresponding to the electrode tab It can be seen that this is formed.
- the black electrode-separator non-adhesive area on the upper part of the bi-cell that is, the edge portion B corresponding to the electrode tab It can be seen that this is formed.
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Abstract
Description
Claims (19)
- 전극 및 분리막이 교대로 배치된 적층체를 가압하는 가압부를 포함하는 이차전지 제조장치에 있어서,상기 가압부는,상기 적층체의 전체 면을 가압하는 메인 가압부; 및상기 적층체의 전체 면 중 상기 전극에 구비된 전극활물질층의 엣지부가 위치한 상기 적층체의 일부 면을 가압하는 드럼부를 구비한 서브 가압부를 포함하며;상기 드럼부는,회전축을 가지는 몸체부; 및상기 몸체부의 외주면에 구비되고, 상기 적층체의 일부 면을 가압하는 탄성부를 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 전극활물질의 엣지부는, 끝단으로 갈수록 높이가 줄어드는 곡면으로 형성되고,상기 드럼부는, 상호 대응하는 상기 전극활물질층의 엣지부와 분리막 사이가 접착되도록 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 2에 있어서,상기 탄성부는, 탄성 변형 가능하게 구비되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 3에 있어서,상기 탄성부는, 내부 공간이 형성되며,상기 내부 공간에는, 미리 설정된 압력을 유지하도록 공기(air) 또는 유체가 충진되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 3에 있어서,상기 탄성부는, 변형이 가능한 합성수지로 마련되고,상기 합성수지는, 실리콘 고무로 마련되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는, 상기 일부 면의 가압 시에만 형상이 변형되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 이차전지 제조장치는,상기 서브 가압부가 상기 적층체의 상기 일부 면을 가압하는 압력을 검출하는 압력 검출부를 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 7에 있어서,상기 압력 검출부는,압력을 감지하는 센서부; 및상기 센서부에 의해 감지된 압력을 표시하는 표시부를 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 8에 있어서,상기 센서부는, 상기 적층체의 일부 면을 사이에 두고 상기 서브 가압부와 마주보게 배치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 적층체는, 상기 전극에 연결되는 전극 탭을 포함하며;상기 서브 가압부는, 상기 전극 탭이 연결되고, 상기 전극에 구비된 전극활물질층의 엣지부가 위치한 상기 적층체의 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는,상기 메인 가압부의 전방 및 후방 중 적어도 어느 하나에 배치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 11에 있어서,상기 이차전지 제조장치는,상기 가압부의 후방에 배치되며 상기 전극 및 상기 분리막이 적층된 상기 적층체에 열을 가하는 가열부를 포함하며;상기 서브 가압부는, 상기 가열부 및 상기 메인 가압부의 사이에 배치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 엣지부는, 상기 전극에 구비된 전극활물질층의 양쪽 단부에 각각 구비되고,상기 드럼부는, 전극활물질층의 양쪽 단부에 각각 구비된 상기 엣지부가 위치한 상기 적층체의 일부 면을 각각 가압하게 한 쌍으로 마련되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 엣지부는, 상기 전극에 구비된 전극활물질층의 양쪽 단부에 각각 구비되고,상기 드럼부는, 전극활물질층의 양쪽 단부에 각각 구비된 상기 엣지부가 위치한 상기 적층체의 일부 면을 포함하는 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 4에 있어서,상기 서브 가압부는, 상기 탄성부의 내부 공간에 충진된 공기(air) 또는 유체의 압력을 측정하는 압력센서를 더 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 4에 있어서,상기 서브 가압부는, 상기 몸체부를 통해 상기 탄성부의 내부 공간에 공기(air) 또는 유체를 주입하는 주입부가 더 형성되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는, 상기 적층체의 일부 면 상부와 하부에 각각 대응되게 배치되고 상기 적층체의 일부 면 상부와 하부를 동시에 가압하게 한 쌍으로 마련되는 것을 특징으로 하는 이차전지 제조장치.
- 전극 및 분리막이 교대로 배치된 전극 단위체를 제조하는 전극 단위체 제조단계;상기 전극 단위체 제조단계에서 제조된 다수의 전극 단위체 사이에 분리막 시트를 배치하여 전극조립체를 제조하는 전극조립체 제조단계; 및상기 전극조립체를 가압하는 전극조립체 가압단계를 포함하는 이차전지 제조방법으로서,상기 전극 단위체 제조단계는,상기 분리막과 상기 전극을 교대로 배치하여 적층체를 만드는 적층단계;상기 적층체에 포함된 상기 분리막과 상기 전극을 접착시키는 접착단계를 포함하며;상기 접착단계는,상기 적층체의 전체 면을 가압하는 전체 면 가압단계; 및상기 적층체의 전체 면 중 상기 전극에 구비된 전극활물질층의 엣지부가 위치한 상기 적층체의 일부 면을 가압하는 제1 일부 면 가압단계를 포함하는 것을 특징으로 하는 이차전지 제조방법.
- 청구항 18에 있어서,상기 전극조립체 가압단계는,상기 전극조립체의 전체 면을 가압하는 제2 전면 가압단계; 및상기 전극조립체의 전체 면 중 상기 전극에 구비된 전극활물질층의 엣지부가 위치한 상기 전극조립체의 일부 면을 가압하는 제2 일부 면 가압단계를 포함하는 것을 특징으로 하는 이차전지 제조방법.
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JP2023543387A JP2024503884A (ja) | 2021-09-16 | 2022-09-15 | 二次電池製造装置及びそれを用いる二次電池製造方法 |
US18/273,191 US20240128490A1 (en) | 2021-09-16 | 2022-09-15 | Apparatus For Manufacturing Secondary Battery And Method For Manufacturing Secondary Battery Using The Same |
EP22870314.6A EP4276959A1 (en) | 2021-09-16 | 2022-09-15 | Secondary battery manufacturing apparatus and secondary battery manufacturing method using same |
CN202280009221.8A CN116745947A (zh) | 2021-09-16 | 2022-09-15 | 制造二次电池的设备及使用该设备制造二次电池的方法 |
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KR20160097775A (ko) * | 2015-02-10 | 2016-08-18 | 에스케이이노베이션 주식회사 | 전극 시트용 프레스 장치 |
KR20170124336A (ko) * | 2016-05-02 | 2017-11-10 | 주식회사 엘지화학 | 이차전지의 제조방법 및 전극 조립체의 제조방법 |
KR102129708B1 (ko) * | 2018-09-12 | 2020-07-03 | 유펙스켐(주) | 권취를 위한 전지용 분리막 제조장치 |
KR20210124357A (ko) | 2019-02-04 | 2021-10-14 | 디에스엠 아이피 어셋츠 비.브이. | 염증성 장 질환의 치료를 위한 치료 조합물 및 조성물 |
KR20200131614A (ko) * | 2019-05-14 | 2020-11-24 | 주식회사 엘지화학 | 전극 조립체 제조장치와, 이를 통해 제조된 전극 조립체 및 이차전지 |
KR102262339B1 (ko) * | 2019-09-10 | 2021-06-08 | 주식회사 나인테크 | 이차전지 전극 라미네이션장치 |
KR20220115228A (ko) | 2021-02-10 | 2022-08-17 | (주) 더엠컴퍼니 | 통합 매출 관리 시스템 |
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EP4276959A1 (en) | 2023-11-15 |
JP2024503884A (ja) | 2024-01-29 |
US20240128490A1 (en) | 2024-04-18 |
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