WO2023080760A1 - 이차전지 제조장치 및 이를 이용하는 이차전지 제조방법 - Google Patents
이차전지 제조장치 및 이를 이용하는 이차전지 제조방법 Download PDFInfo
- Publication number
- WO2023080760A1 WO2023080760A1 PCT/KR2022/017461 KR2022017461W WO2023080760A1 WO 2023080760 A1 WO2023080760 A1 WO 2023080760A1 KR 2022017461 W KR2022017461 W KR 2022017461W WO 2023080760 A1 WO2023080760 A1 WO 2023080760A1
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- WO
- WIPO (PCT)
- Prior art keywords
- laminate
- pressing
- secondary battery
- unit
- sub
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 48
- 238000003825 pressing Methods 0.000 claims abstract description 162
- 238000000034 method Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011267 electrode slurry Substances 0.000 description 19
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000011888 foil Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing 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
- 239000011149 active material Substances 0.000 description 1
- 239000011230 binding agent Substances 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
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 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
- 238000005096 rolling process Methods 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
-
- 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
- H01M10/0481—Compression means other than 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
- H01M10/04—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
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- 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
-
- 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, to a secondary battery manufacturing apparatus including a pressurizing unit for pressing a laminate in which electrodes and separators are stacked, 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 pouch type manufactured by manufacturing an electrode assembly by stacking a cylindrical secondary battery manufactured by sealing the secondary battery and electrode unit units of a predetermined size with a separator sheet interposed therebetween, storing the manufactured electrode assembly in a pouch and sealing it. It can be classified as a 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 pressing unit in a secondary battery manufacturing apparatus including a pressing unit for pressurizing a laminate in which electrodes and separators are stacked, the pressing unit includes: a main pressurizing unit for pressing the front surface of the laminate; and a sub-pressing unit for pressing a portion of the laminated body;
- the partial surface is formed at an end portion of the laminate in the longitudinal direction, and includes a surface formed with a relatively low height among the front surfaces, and the sub-pressing part moves along the longitudinal direction of the laminate and presses the partial surface.
- the secondary battery manufacturing apparatus further includes a conveying unit for conveying the laminate in one direction;
- the sub-pressing unit may press the partial surface while moving in a direction perpendicular to the one direction.
- the sub-pressing unit may include a drum unit that rotates and pressurizes the partial surface of the laminate; And a rotating shaft coupled to the drum portion to rotate the drum portion; can include
- the laminate includes electrode tabs connected to the electrodes;
- the partial surface may be positioned to correspond to an end of the laminate in a longitudinal direction where the electrode tab is positioned.
- the secondary battery manufacturing apparatus may further include a heating unit for applying heat to the laminate in which the electrode and the separator are laminated.
- the sub pressing part may be disposed in front of the main pressing part.
- the sub-pressing part may pressurize a portion of the surface of the laminate while moving from the inside to the outside of the laminate.
- the sub pressing part may be disposed behind the main pressing part.
- the sub-pressing part may pressurize a portion of the surface of the laminate while moving from the outside to the inside of the laminate.
- the laminate is an electrode unit in which electrodes and separators are stacked, and may be any one of bi-cell, mono-cell, and full-cell.
- the stack may be an electrode assembly in which a plurality of electrode units in which electrodes and separators are stacked and separator sheets are stacked.
- the pressing of the laminate includes: a front pressing step of pressing the front surface of the laminate; and a partial surface pressing step of pressing a partial surface of the laminate;
- the partial surface is formed at an end of the laminate in the longitudinal direction, and includes a surface formed with a relatively low height among the front surfaces, and in the pressing of the partial surface, a sub-pressing unit for pressing the partial surface is the laminate. It provides a method for manufacturing a secondary battery, characterized in that the partial surface is pressed while moving along the longitudinal direction of the.
- the secondary battery manufacturing apparatus and the secondary battery manufacturing method using the same according to the present invention have the advantage of improving the unbonded area inside the laminate by pressing the surface formed with a relatively low height among the front surfaces of the laminate using a sub-pressing unit.
- the secondary battery manufacturing apparatus has the advantage of responding to various sizes and shapes of the surface formed with a relatively low height among the front surfaces of the laminate without replacing the sub-pressing part by pressing along the longitudinal direction of the laminate.
- 1A is a plan view showing a state in which a laminate is viewed from above.
- 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 in which the secondary battery manufacturing apparatus according to the first embodiment of the present invention is looked down from above.
- 3A is a side view showing a side of the sub-pressing unit of FIG. 2 in more detail.
- FIG. 3B is an enlarged view of portion A of FIG. 3A , showing in more detail how the sub-pressing unit presses the laminate.
- FIG. 4 is a perspective view showing the appearance of a sub-pressing unit in the secondary battery manufacturing apparatus of FIG. 2 in more detail.
- 5A to 5B are images showing the formation of unbonded regions of bi-cells manufactured by a conventional secondary battery manufacturing apparatus and a secondary battery manufacturing apparatus according to the present invention.
- the present invention can provide a secondary battery manufacturing apparatus including a pressing unit 100 for pressing the laminate 10 in which electrodes and separators are stacked.
- the laminate 10 is a structure in which electrodes and separators are stacked, and various configurations are possible.
- the laminate 10 is an electrode unit in which electrodes and separators are stacked, that is, a unit cell, and may mean any one of bi-cell, mono-cell, and full-cell, and electrodes and separators are stacked. It may mean an electrode assembly in which a plurality of electrode units (unit cells) and separator sheets are stacked.
- the electrode assembly may have any structure as long as it has a structure in which a plurality of the 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 stack 10 facing the pressing unit 100 to be pressed may be defined as the front surface 11 .
- the front surface 11 may have a height difference.
- the electrode-separator or electrode unit-separator sheet remains as an unbonded area, which is the cause of lithium precipitation on the negative electrode interface. It can be.
- the front surface 11 includes a part surface 12 including a surface formed with a relatively low height among the front surface 11 of the laminate 10, and an electrode slurry is uniformly applied on the electrode current collector and may include a 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 a relatively low height among the front surfaces 11 of the laminate 10 because less electrode slurry is applied on the electrode current collector, and may be configured in various ways. .
- the partial surface 12 is a surface on which a height difference is formed, and as shown in FIG. 1B, a first partial surface 12a having a relatively low height among the front surface 11 and the first partial surface 12a. It may include a second partial surface 12b formed higher than the height of (12a).
- the first partial surface 12a is a surface formed with a relatively low height among the front surfaces, and may be a surface corresponding to the unbonded area inside the laminate 10, FIG. 1B As shown in, the first height (H One ) It can be located.
- the first height (H 1 ) is based on one surface of the laminate 10 located in the stacking direction of the electrode and the separator, the height to the other surface facing the one surface is the remaining surface of the front surface 11 ( 13) may be defined as a height formed relatively lower than the height (H 3 ).
- the height (H 3 ) of the remaining surface 13 is located in the stacking direction of the electrode and the separator in the region where the electrode slurry is uniformly applied on the electrode current collector. Based on one surface of the laminate 10 , It can be understood as the height to the other side facing the one side.
- 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 According to this, it may be formed in various directions from the first partial surface 12a 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 second partial surface 12b is a surface located at a second height (H 2 ), where the second height (H 2 ) is of the laminate 10 located in the stacking direction of the electrode and the separator. Based on one surface, the height to the other surface facing the one surface may be defined as a height formed higher than the first height (H 1 ). In this case, the second height H 2 may be the same height as the height H 3 of the remaining surface 13 .
- the partial surface 12 may be composed of only the first partial surface 12a having a relatively low height among the front surfaces 11 .
- the partial surface 12 may be located anywhere on the laminate 10 .
- the partial surface 12 may be positioned to correspond to an end of the longitudinal direction formed based on the longitudinal direction of the laminate 10 .
- the longitudinal direction of the laminate 10 is a direction formed parallel to the long side of the one surface of the laminate 10 located in the stacking direction of the electrode and the separator (refer to FIG. 2). y direction).
- the partial surface 12 may be positioned to correspond to an end of the longitudinal direction of the multilayer body 10 where the electrode tab 14 is located among the longitudinal ends of the multilayer body 10 .
- the longitudinal direction of the laminate 10 originally corresponding to the central portion of the electrode current collector It is expected that the electrode slurry is sufficiently applied to the end of the electrode, but it can be understood that the electrode slurry is relatively less easily reached to the end of the electrode current collector in the longitudinal direction where the electrode tab 14 is located.
- 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 above-described laminate 10 may be pressed by a pressing unit 100 to be described later for adhesion of electrodes and separators.
- the plurality of laminates 10 may be transported in one direction by the transfer unit 200 so that they can be pressed more quickly.
- the sending unit 200 may be provided on one side of the pressing unit 100 facing the pressing direction, and may include a conveyor belt or the like.
- the pressing unit 100 is provided on the upper side of the transfer unit 200 to press the laminates 10 transferred from the transfer unit 200 .
- the pressing unit 100 as shown in Figure 2, the main pressing unit 110 for pressing the front 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 front 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 additionally pressurizes the partial surface 12 including the surface formed with a relatively low height among the front surfaces 11 separately from being pressed by the main pressing part 110, thereby forming a laminated body.
- the unbonded area of (10) can be improved.
- the sub-pressing unit 120 is provided to be movable, so that it can respond to various changes in the relatively low-height surface of the front surface 11 of the individual laminate 10 .
- the sub-pressing unit 120 considers that the laminate 10 is formed in various lengths and widths for each model, and that the region where the electrode slurry cannot reach is irregularly formed for each laminate 10 By doing so, the sub pressing unit 120 can be movably provided.
- the sub-pressing part 120 is movable along the longitudinal direction of the laminate 10 in consideration of the fact that the partial surface 12 is formed at the end of the laminate 10 in the longitudinal direction as described above. may be provided.
- the sub-pressing unit 120 may press the partial surface 12 while moving along the longitudinal direction of the laminate 10 .
- the stack 10 is on the transport unit 200 in the longitudinal direction of the stack 10 (y direction based on FIG. 2)
- the partial surface while moving in a direction (y direction in FIG. 2) perpendicular to the transport direction (x direction in FIG. 2) of the laminate 10 (12) can be pressurized.
- the sub-pressing unit 120 may sequentially press the laminate 10 along the longitudinal direction of the laminate 10, as shown in FIG. 3B. , Regardless of the formation position of the first partial surface 12a formed with a relatively low height among the partial surfaces 12 formed at the end of the laminate 10 in the longitudinal direction, the entire surface of the first partial surface 12a area can be pressed.
- sub-pressing part 120 may move from the inside of the laminate 10 toward the outside along the longitudinal direction of the laminate 10, or may move from the outside of the laminate 10 toward the inside. is of course
- the sub-pressing part 120 may have various structures.
- the sub-pressing unit 120 includes a drum unit 121 that rotates and presses the partial surface 12 of the laminate 10; It may include a rotating shaft 122 coupled to the drum unit 121 to rotate the drum unit.
- the drum unit 121 is configured to rotate and press the partial surface 12 of the laminate 10, and various configurations are possible.
- the drum unit 121 may rotate by receiving rotational force from the rotating shaft 122 and may have various shapes.
- the drum unit 121 may have a cylindrical cylinder shape, a wheel shape having a plurality of spokes, and the like.
- the drum unit 121 may have various sizes. However, when the sub-pressing unit 120 moves along the longitudinal direction of the stack 10, the width of the drum unit 121 is equal to or greater than the width of the stack 10. It is desirable to form large. At this time, the width of the drum unit 121 and the width of the multilayer body 10 may be understood as a width in which the transport direction of the multilayer body 10 transported on the transfer unit 200 is the longitudinal direction.
- the rotating shaft 122 is configured to rotate the drum unit by being coupled with the drum unit 121, and various configurations are possible.
- one end of the rotating shaft 122 may be connected to a driving motor to receive rotational force, and transmit rotational force of the driving motor 122 to the drum unit 121 .
- the rotating shaft 122 may include a bearing (not shown) provided between the rotating shaft 122 and the drum unit 121 while surrounding an outer circumferential surface of the rotating shaft 122 .
- the rotary shaft 122 may be coupled with a support part 122 ′ that can be connected to a moving unit (not shown) that moves the sub-pressing part 120 .
- the support part 122 ′ may rotatably support and couple the rotating shaft 122 , and for example, may be combined with the rotating shaft 122 by a bearing.
- the above-described moving unit may have any configuration as long as it moves the sub-pressing unit 120 in a horizontal direction and/or a vertical direction.
- the moving unit drives a coupling unit (not shown) coupled with the sub pressing unit 120 to move the sub pressing unit 120 and the coupling unit (not shown).
- a driving unit may be included.
- the coupling unit may be coupled to the above-described support unit 122' through bolt coupling, etc., and the driving unit may include an actuator or the like.
- the above-described sub-pressing part 120 is disposed at least one of the front and rear of the main pressing part 110, before and / or before pressing the front surface 11 of the laminate 10 ( After pressing 11), some surfaces 12 of the laminate 10 may be pressed.
- a direction toward the moving direction on the transfer unit 200 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 may be disposed in front of the main pressing part 110 .
- the laminate 10 since the laminate 10 is in a state of being pressed by the main pressurizing part 110, when the sub-pressing part 120 moves from the outside to the inside of the laminate 10, the electrode and the separator are milled Air bubbles can be generated inside the laminate 10 while doing so. Accordingly, when the sub-pressing part 120 is disposed in front of the main pressing part 110, the sub-pressing part 120 moves from the inside of the laminate 10 toward the outside of the laminate 10. It may be desirable to pressurize some faces 12 .
- the sub pressing part 120 may be disposed behind the main pressing part 110 .
- the sub-pressing part 120 may press the partial surface 12 of the laminate 10 while moving from the outside to the inside of the laminate 10. can However, it goes without saying that even at this time, the sub-pressing part 120 may press the partial surface 12 of the laminate 10 while moving from the inside to the outside of the laminate 10 .
- the secondary battery manufacturing apparatus may further include a heating unit 300 for applying heat to the laminate 10 .
- the heating unit 300 applies heat to the laminate 10 in which the electrode and the separator are stacked, and various configurations are possible.
- the heating unit 300 may be disposed at the rear of the pressing unit 100, and as described above, the rear may mean a direction opposite to the direction in which the laminate 10 travels on the conveyor belt.
- the heating unit 300 is disposed behind the pressing unit 100 to apply heat to the stack 10 before the press unit 100 presses the stack 10 there is. 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 present invention provides a secondary battery manufacturing method including a laminate press step of pressurizing the laminate 10 in which the electrode and the separator are laminated.
- the laminate 10 is a configuration in which electrodes and separators are stacked, and various configurations are possible.
- the laminate 10 is an electrode unit in which electrodes and separators are stacked, that is, a unit cell, and may mean any one of bi-cell, mono-cell, and full-cell, and electrodes and separators are stacked. It may mean an electrode assembly in which a plurality of electrode units (unit cells) and separator sheets are stacked.
- the pressing of the laminate may include: a front pressing step of pressing the front surface 11 of the laminate 10; and a partial surface pressing step of pressing the partial surface 12 of the laminate 10 .
- the front pressing step is a step of pressing the front surface 11 of the laminate 10, and may be performed by various methods.
- the front surface 11 may be performed by pressing the front 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 height difference occurs on the front surface of the laminate 10, and unbonded areas may occur on some surfaces 12 including surfaces with a relatively low height among the front surfaces.
- the partial surface pressing step is a step of pressurizing the partial surface 12 of the laminate 10, and may be performed by various methods.
- the partial surface pressing step may be performed by pressing the partial surface 12 of the laminate 10 through the sub-pressing unit 120 in consideration of the conveying speed and the conveying position of the laminate 10.
- the detailed configuration and effects of the sub-pressing unit 120 may be substituted for the above description.
- the partial surface pressing step is a step of additionally pressing the partial surface 12 of the laminate 10 in order to improve the unbonded area of the partial surface 12, wherein the partial surface pressing step, Of course, it can be performed not only after the front pressing step is performed, but also before the front pressing step is performed.
- the partial surface pressing step may include a lowering step of lowering the sub-pressing part 120 toward the laminate 10 at one position; a pressing and moving step of moving the multilayer body 10 while pressing it along the longitudinal direction with the sub-pressing unit 120; and a return step of returning the sub-pressing part 120 to the one position.
- the lowering step is a step of lowering the sub-pressing part 120 toward the laminate 10 from one position, and may be performed in various ways.
- the lowering step may be performed by lowering the sub-pressing unit 120 to contact and/or press the laminate 10 using the aforementioned moving unit (not shown). .
- the pressing and moving step is a step of moving the laminate 10 while pressing it along the longitudinal direction with the sub-pressing unit 120, and may be performed in various ways.
- the pressing and moving step may be performed by horizontally moving the sub-pressing unit 120 along the longitudinal direction of the laminate 10 using the aforementioned moving unit (not shown).
- the returning step is a step of returning the sub-pressing part 120 to the one position, and may be performed in various ways.
- the sub-pressing unit 120 finishes pressurizing the laminate 10
- the sub-pressing unit 120 is raised and horizontally moved using the aforementioned moving unit (not shown). It can be performed by returning to the one position.
- the laminate is a bi-cell
- a front image of the bi-cell manufactured according to the prior art hereinafter referred to as a 'comparative example'
- a front image of a bi-cell manufactured according to the present invention hereinafter referred to as 'an embodiment of 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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- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (12)
- 전극 및 분리막이 적층된 적층체를 가압하는 가압부를 포함하는 이차전지 제조장치에 있어서,상기 가압부는,상기 적층체의 전면을 가압하는 메인 가압부; 및상기 적층체의 일부 면을 가압하는 서브 가압부를 포함하며;상기 일부 면은,상기 적층체의 길이 방향의 단부에 형성되되, 상기 전면 중 높이가 상대적으로 낮게 형성된 면을 포함하고,상기 서브 가압부는,상기 적층체의 길이 방향을 따라 이동하면서 상기 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 적층체를 일 방향으로 이송하는 이송부를 더 포함하며;상기 서브 가압부는,상기 일 방향에 대하여 수직한 방향으로 이동하면서 상기 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는,상기 적층체의 상기 일부 면을 회전하면서 가압하는 드럼부; 및상기 드럼부와 결합하여 상기 드럼부를 회전시키는 회전축; 을 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 적층체는, 상기 전극에 연결되는 전극 탭을 포함하며;상기 일부 면은, 상기 적층체의 상기 전극 탭이 위치하는 길이 방향의 단부에 대응되어 위치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 전극 및 상기 분리막이 적층된 상기 적층체에 열을 가하는 가열부를 더 포함하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는, 상기 메인 가압부의 전방에 배치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 6에 있어서,상기 서브 가압부는,상기 적층체의 내부로부터 외부를 향하여 이동하면서 상기 적층체의 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 서브 가압부는, 상기 메인 가압부의 후방에 배치되는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 8에 있어서,상기 서브 가압부는,상기 적층체의 외부로부터 내부를 향하여 이동하면서 상기 적층체의 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 적층체는, 전극 및 분리막이 적층된 전극 단위체로서, bi-cell, mono-cell 및 full-cell 중 어느 하나인 것을 특징으로 하는 이차전지 제조장치.
- 청구항 1에 있어서,상기 적층체는, 전극 및 분리막이 적층된 다수의 전극 단위체와 분리막 시트가 적층된 전극조립체인 것을 특징으로 하는 이차전지 제조장치.
- 전극 및 분리막이 적층된 적층체를 가압하는 적층체 가압단계를 포함하는 이차전지 제조방법에 있어서,상기 적층체 가압단계는,상기 적층체의 전면을 가압하는 전면 가압단계; 및상기 적층체의 일부 면을 가압하는 일부 면 가압단계를 포함하며;상기 일부 면은,상기 적층체의 길이 방향의 단부에 형성되되, 상기 전면 중 높이가 상대적으로 낮게 형성된 면을 포함하고,상기 일부 면 가압단계는,상기 일부 면을 가압하는 서브 가압부가 상기 적층체의 길이 방향을 따라 이동하면서 상기 일부 면을 가압하는 것을 특징으로 하는 이차전지 제조방법.
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EP22890491.8A EP4333143A1 (en) | 2021-11-08 | 2022-11-08 | Secondary battery manufacturing apparatus and secondary battery manufacturing method using same |
CN202280040975.XA CN117501489A (zh) | 2021-11-08 | 2022-11-08 | 二次电池制造设备和使用其的二次电池制造方法 |
JP2023568472A JP2024516732A (ja) | 2021-11-08 | 2022-11-08 | 二次電池製造装置及びそれを用いる二次電池製造方法 |
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Citations (5)
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JP2013165036A (ja) * | 2012-02-13 | 2013-08-22 | Nissan Motor Co Ltd | 電池押圧装置および電池押圧方法 |
KR20150107115A (ko) * | 2014-03-13 | 2015-09-23 | 주식회사 엘지화학 | 활성화된 전지셀의 가스 제거 장치 및 전지셀 제조방법 |
KR20180042000A (ko) * | 2016-10-17 | 2018-04-25 | 주식회사 엘지화학 | 전지 내부에 발생된 기포제거 방법 |
KR20180065231A (ko) * | 2016-12-07 | 2018-06-18 | 주식회사 엘지화학 | 전극조립체 제조를 위한 폴딩 장치 및 스택/폴딩형 전극조립체의 제조방법 |
KR20210069377A (ko) * | 2019-12-03 | 2021-06-11 | 주식회사 엘지에너지솔루션 | 가압 롤러를 포함하는 전지 불량 검사 장치 및 방법 |
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- 2022-11-08 CN CN202280040975.XA patent/CN117501489A/zh active Pending
- 2022-11-08 EP EP22890491.8A patent/EP4333143A1/en active Pending
- 2022-11-08 WO PCT/KR2022/017461 patent/WO2023080760A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013165036A (ja) * | 2012-02-13 | 2013-08-22 | Nissan Motor Co Ltd | 電池押圧装置および電池押圧方法 |
KR20150107115A (ko) * | 2014-03-13 | 2015-09-23 | 주식회사 엘지화학 | 활성화된 전지셀의 가스 제거 장치 및 전지셀 제조방법 |
KR20180042000A (ko) * | 2016-10-17 | 2018-04-25 | 주식회사 엘지화학 | 전지 내부에 발생된 기포제거 방법 |
KR20180065231A (ko) * | 2016-12-07 | 2018-06-18 | 주식회사 엘지화학 | 전극조립체 제조를 위한 폴딩 장치 및 스택/폴딩형 전극조립체의 제조방법 |
KR20210069377A (ko) * | 2019-12-03 | 2021-06-11 | 주식회사 엘지에너지솔루션 | 가압 롤러를 포함하는 전지 불량 검사 장치 및 방법 |
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KR20230066997A (ko) | 2023-05-16 |
CN117501489A (zh) | 2024-02-02 |
EP4333143A1 (en) | 2024-03-06 |
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