WO2014123362A1 - 단차가 형성된 전극 조립체, 상기 전극 조립체를 포함하는 이차전지 및 상기 전극 조립체 제조방법 - Google Patents
단차가 형성된 전극 조립체, 상기 전극 조립체를 포함하는 이차전지 및 상기 전극 조립체 제조방법 Download PDFInfo
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- WO2014123362A1 WO2014123362A1 PCT/KR2014/001003 KR2014001003W WO2014123362A1 WO 2014123362 A1 WO2014123362 A1 WO 2014123362A1 KR 2014001003 W KR2014001003 W KR 2014001003W WO 2014123362 A1 WO2014123362 A1 WO 2014123362A1
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- Prior art keywords
- electrode
- separator
- electrode assembly
- stack
- area
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000000926 separation method Methods 0.000 claims abstract description 30
- 239000012528 membrane Substances 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 238000003475 lamination Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000005518 polymer electrolyte Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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- 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
- H01M10/045—Cells or batteries with folded plate-like electrodes
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- 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
- H01M10/0445—Multimode batteries, e.g. containing auxiliary cells or electrodes switchable in parallel or series connections
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/052—Li-accumulators
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- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- 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
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- H—ELECTRICITY
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- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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- 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
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to an electrode assembly having a step assembled by a stack and folding type, and more particularly, to an electrode assembly having a shape of a separator formed in the stepped portion and the same shape as the stepped portion of the electrode assembly, and a method of manufacturing the same. .
- the present invention also relates to a secondary battery including the electrode assembly.
- the electrode assembly having a step has a structure as shown in FIG. 1.
- the positive electrode 11 or the negative electrode 13 is disposed on both surfaces thereof as the outermost electrode.
- the conventional electrode assembly having a step has a first step having no step by arranging the negative electrode and the positive electrode having the first area on the separator long in one direction, and then folding or laminating the negative electrode and the positive electrode alternately stacked on each other. After obtaining an electrode laminated body and obtaining the 2nd electrode laminated body which has a 2nd area by the same method, the electrode assembly which has a level
- the electrode assembly obtained by the conventional method as described above is obtained by mutually stacking electrode laminates having individual areas, an inclined surface by a separator is not formed in the stepped portion formed by lamination between the electrode laminates.
- a tension is generated in the stepped portion between the layers by the separator to form an inclined surface.
- the separator tension is inserted into the battery case. Lowers.
- the tension of the separator during the pressing process may cause bending of the large-area electrode at the lower end as shown in FIG. 6, which may cause a shape defect of the electrode assembly. Therefore, in the electrode assembly assembled by the stack and folding type, such membrane tension should be eliminated.
- the present invention is to provide an electrode assembly in which the tension between each layer formed by the separator is eliminated in the electrode assembly assembled by the stack and folding type.
- the present invention is to provide a secondary battery, a battery pack and a device including an electrode assembly in which the separator tension is eliminated.
- the present invention is to provide a method for releasing tension in the above and the electrode assembly.
- the present invention provides a stack-and-fold type electrode assembly having a step in which tension is eliminated, wherein at least two first electrode units having a first area and at least two second electrodes having a second area smaller than the first area are provided.
- a stack and folding type electrode assembly in which units are wound and stacked by a rectangular separator, wherein the electrode assembly includes a first electrode stack including a plurality of first electrode units and a second electrode stack including a plurality of second electrode units. And a stepped portion having a step by an area difference between the first electrode stack and the second electrode stacked body, wherein the separator covers the stepped portion with two or more layers, and the separator is the same as the stepped step. It provides an electrode assembly having a shape.
- the separators covering the stepped portions have different thicknesses of the separators, and the thickness of the separators increases from the surface of the electrode assembly to the inside thereof.
- At least one layer of the surface of the separation membrane covering the step may be cut and all may be cut.
- the separator covering the stepped portion may be stretched, and the thickness of the separator covering the stepped portion may be 95% or less of the thickness of the separator disposed between the electrode unit and the electrode unit.
- the second electrode laminate may further include an electrode laminate in which at least one electrode unit having an area smaller than the second area is stacked on the second electrode unit, and may be an electrode laminate having at least one step.
- the electrode unit comprises a single electrode; A unit cell in which at least one anode and at least one cathode are stacked on a separator; Or combinations thereof.
- the unit cell may be at least one selected from the group consisting of a jelly-roll unit cell, a stacked unit cell, a lamination and a stacked unit cell, and a stack and folding unit cell.
- the uppermost electrode of the first electrode stack may be a cathode.
- first electrode stack and the second electrode stack may be stacked with different electrodes facing each other.
- the present invention also relates to a method for manufacturing a stack-and-fold type electrode assembly having a step in which tension is eliminated, wherein the two or more first electrode units having a first area and a second area having a second area smaller than the first area are provided.
- the above electrode units are arranged on a rectangular separator, and the separator is wound while surrounding the electrode unit, and the large area electrode laminate by the large area electrode unit and the small area electrode laminate by the small area electrode unit are laminated to each other.
- the separator in which the tension is eliminated may be thickened from the surface of the electrode assembly to the inside of the separator.
- the tension of the separator covering the step may be solved by stretching the separator covering the step.
- the stretching may be performed by heating the separator covering the step to a temperature range of 80-100 °C, and may be performed by pressing the separator covering the step with a jig of 80-100 °C temperature.
- the jig may use a shape having the same shape as the step of the electrode assembly.
- the present invention relates to a secondary battery including the electrode assembly, the secondary battery is the electrode assembly is housed in a battery case.
- the battery case has a step of the same shape as the electrode assembly.
- the present invention when assembling an electrode assembly having a step by stacking and folding in an electrode assembly having a step, tension between the layers generated by the separator can be eliminated, so that the electrode assembly when inserted into the battery case.
- the insertability of the electrode can be improved, and bending of the lower electrode laminate in the pressing step can be suppressed, so that a poor appearance of the electrode assembly can be eliminated.
- FIG. 1 is a perspective view schematically showing an electrode assembly having a step.
- FIGS. 2 and 3 illustrate an example of an exploded view of an electrode unit in which an electrode unit is arranged on a rectangular separator when assembling an electrode assembly having a step by stack and folding.
- 4 and 5 are schematic views illustrating a conceptual diagram in which tension by a separator is generated in an electrode assembly assembled by stack and folding.
- FIG. 6 is a conceptual diagram schematically illustrating a shape in which an electrode stack is bent by separator tension.
- FIG. 7 is a schematic view schematically illustrating a method of releasing tension of a separator by a jig press according to an embodiment of the present invention, and a cross-sectional view schematically illustrating an electrode assembly including a separator in which a step is formed.
- FIG. 8 is a schematic view of an electrode assembly including a separator in which a step is formed by cutting a separator.
- FIG. 9 is a view schematically illustrating a concept of cutting the separator of the inclined surface in the step in which the separator forms the inclined surface in the electrode assembly having the step.
- the electrode assembly of the present invention includes a first electrode stack in which at least one electrode unit having a first area is stacked, and a second electrode stack in which at least one electrode unit having a second area smaller than the first area is stacked. And the first and second electrode laminates stacked in a direction perpendicular to a plane, and have a step as shown in FIG. 1.
- the electrode unit constituting each electrode stack may be a unit electrode of a cathode or an anode, or a unit cell in which at least one cathode and at least one anode are laminated with a separator.
- the unit cells may be a monocell in which one cathode and one anode are stacked on a separator or one center electrode is disposed at the center, and the same electrode having a different polarity than the center electrode is formed on both surfaces of the center electrode. It may be a deployed bicell.
- the bicell may be an A type bicell whose center electrode is a cathode and a C type bicell whose center electrode is a positive electrode.
- the unit cell may be selected from the group consisting of a jelly-roll type, a stack type, a lamination and stack type, and a stack and folding type unit cell, and the unit cell may be disposed on the outermost both sides.
- the polarities of the two electrodes may be the same or different from each other.
- the electrode assembly is formed by stacking a first electrode stack and a second electrode stack on the first electrode stack.
- the first electrode stack is formed by an electrode unit having a first area
- the second electrode stack is formed by an electrode unit having a second area smaller than the first area. It includes a stepped portion having an area difference between the electrodes constituting the electrode stack and a step formed by the area difference.
- the second electrode stack may not have a step by stacking electrode units having the same area, but may be an electrode stack having at least one step in which at least one electrode stack having an area smaller than the second area is stacked.
- the electrode stack stacked on the second electrode stack may be an electrode stack having a structure in which the area is sequentially reduced in the vertical direction with respect to the plane.
- the electrode stack is formed by alternately stacking a cathode and an anode alternately with a boundary between the separators.
- the cathode and the anode face each other even at a boundary that forms a step between electrode stacks having different areas.
- the outermost electrode of the first electrode laminate is the It is preferable that a cathode is arrange
- the positive electrode is disposed as the outermost electrode of the first electrode laminate, there is a fear that lithium of the positive electrode active material precipitates during charging and discharging of the battery, thereby degrading battery safety. Therefore, when the negative electrode and the positive electrode face at the boundary portion having a step, it is preferable that the negative electrode is arranged as an electrode having a large area.
- Electrode assembly of the present invention is assembled by a stack and folding type, the electrode unit is arranged on a rectangular separator long in the horizontal direction with respect to the longitudinal direction, and the electrode by winding the rectangular separator for each electrode unit The assembly can be formed.
- the material of the rectangular separator is not particularly limited and may be suitably used in the present invention as long as it is commonly used as a separator in the art.
- a multilayer film produced by polyethylene, polypropylene or a combination thereof having a microporous structure, or polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile or polyvinylidene fluoride hexafluoropropylene copolymer Such polymer films for solid polymer electrolytes or gel polymer electrolytes can be used.
- At least one first electrode unit and the second electrode laminate having a first area forming the first electrode laminate
- At least one second electrode unit having a second area is arranged on a rectangular separator, and each of the arranged electrode units are folded in one direction while being wrapped with the separator.
- the rectangular separator surrounds the outside of the electrode stack while facing the electrode unit to one surface of the electrode stack already formed, and each electrode unit is stacked to face each other with the rectangular separator as a boundary, and each electrode unit is stacked.
- the electrode units are stacked on one or both surfaces of the electrode stack already formed.
- the arrangement of the electrode unit is not particularly limited as the first electrode unit and the second electrode unit can be appropriately arranged so that an electrode assembly having a step can be obtained by winding.
- the electrode units 7 and the electrode units 7 adjacent thereto may be continuously arranged.
- the electrode unit 7 can obtain an electrode assembly having a step by folding by properly arranging the electrode units having a large area, a medium area, and a small area on the separator 20.
- At least one space is provided at an adjacent arrangement position of the electrode unit to be initially folded.
- a blank area may be formed at the next electrode unit arrangement position, and, of course, although not shown in the drawing, a blank area may be formed first and then the electrode units may be arranged.
- the electrode units are preferably spaced apart so as to secure a gap of at least the thickness of the electrode assembly.
- the electrode units When the electrode units are arranged on the rectangular separator as shown in FIG. 2, the electrode units that are continuous by folding are respectively positioned on both surfaces of the electrode stack. That is, one electrode unit is located on the upper surface of the electrode stack, and adjacent electrode units are located on the opposite surface of the electrode stack. As a result, the first folding electrode unit is positioned at the center of the electrode assembly formed by stacking and folding.
- the electrode assemblies having a step may be easily assembled by folding in one direction.
- the electrode unit and the blank may be alternately positioned on the rectangular separator.
- the electrode units are stacked on one surface of the electrode unit to be folded for the first time, and the separator that does not include the electrode unit is positioned on the opposite side.
- the consumption of the separator used in the assembly of the electrode assembly is increased, but the arrangement of the electrode unit for the assembly of the electrode assembly can be simplified.
- a stack and folding type electrode assembly may be manufactured by combining the arrangement of the electrode units in consideration of the stacking form and the advantages and disadvantages of the arrangement of the electrode units. will be. That is, when the number of steps is large, the deployment form of the electrode unit for assembling the electrode assembly becomes complicated. Therefore, for a part of the electrode assembly, the electrode method is assembled by stacking the electrode units by the latter method to simplify the process. We can plan.
- the rectangular separator is formed by the area difference between the first electrode stack by the first electrode unit and the second electrode stack by the second electrode unit.
- the formed stepped portion is also enclosed, and as a result, as shown in FIG. 4, the rectangular separation membrane 20 passing through one side surface where the stepped portion of the electrode assembly is formed is formed of the electrode unit of the second electrode laminate and the first electrode laminate.
- the inclined surface 10 is formed between the upper end surfaces.
- the inclined portion 10 formed in the outer stepped portion is illustrated as being formed by one outermost separator 20, but more specifically, as shown in FIG. 10, a plurality of inclined surfaces 10 having different inclination angles by the separators 20 as many as the number of electrode units constituting the upper electrode stack may be formed.
- each electrode unit When assembling the electrode assembly by stacking and folding as described above, each electrode unit is faced with each other and the membrane is wound by applying tension to the separator so as to maintain a flat and firmly stacked shape. An inclined surface appears on the stepped portion, and the electrode assembly does not exhibit a stepped shape due to the stacking of each electrode unit having a different outer area.
- the tension of the separator appearing in the stepped portion may not match the shape of the battery case, thereby reducing the insertability of the electrode assembly. Furthermore, when pressurized after being inserted into the battery case, as shown in FIG. 6, a phenomenon in which the lower end of the electrode assembly is bent due to the tension of the separator may occur, which may result in a poor appearance of the electrode assembly.
- the tension release of the separator may vary depending on the material of the separator, but may be performed by stretching or cutting the rectangular separator.
- the rectangular separator 20 between the second electrode unit end constituting the second electrode stack and the uppermost end of the first electrode stack, that is, the rectangular separator 20 is passed through. And extending or cutting a separator that forms an inclined surface between the distal end of the second electrode unit located at one side end surface of the electrode assembly 1 having the step formed and the distal end of the first electrode unit at the uppermost end of the first electrode stack. The tension of the inclined surface can be eliminated.
- An electrode assembly having a step can be obtained in the same manner as the external shape that can be formed by stacking the electrode units having the same.
- the stretching may be performed by applying pressure while heating the rectangular separator.
- the heating may be different depending on the material of the separator, it is preferable to perform in a temperature range of 80 to 100 °C.
- stretching can be performed by pressing a separator using the jig heated to the said temperature range. It is preferable to use the jig in which a step having the same shape as that of the step of the electrode assembly is formed because the tension of the separator can be eliminated at once even for the electrode assembly having a plurality of steps.
- a step can be provided to the separator in the same shape as that of the step. Therefore, although not particularly limited, since the separation membrane of the stepped portion is stretched, the thickness thereof may be 95% or less with respect to the thickness of the separation membrane of the portion that is not stretched, for example, the portion located in the electrode stack. As shown below, the separation membrane may be broken beyond the stretching limit by the above-mentioned heating and pressurization, and in this case, the membrane thickness of the broken portion may be expressed as 0% with respect to the thickness of the unstretched separator.
- the separation membrane of the portion stretched by the heating and pressing as described above is reduced in thickness by the stretching.
- the degree of stretching may vary depending on the height difference of the stepped portion, and thus the degree of reduction of the thickness of the separator may also vary.
- the stretched separator may be different depending on the height difference in which the separator is located even if it belongs to the same stepped portion.
- the separation membrane (a) forming the outermost inclined surface and the separation membrane (b) forming the innermost inclined surface are different in extent of stretching, so that the thickness is different. Different from each other.
- the separation membrane (a) forming the outermost inclined surface may have a relatively high elongation, and in some cases, it may break beyond the stretching limit in the stretching process, and the separator forming the innermost inclined surface may be Relatively small elongation.
- the plurality of separation membranes cover the steps via the stepped portions because the second electrode stack is composed of the plurality of second electrode units, the uppermost cross section of each electrode unit and the first electrode stack constituting the second electrode stack.
- Each separator forming the inclined surface at various inclination angles is different from each other to extend the tension to eliminate the tension, the thickness of the separator covering the step is gradually reduced in thickness from the inside to the outside.
- the degree of reduction of the membrane thickness may vary depending on the degree of inclination angle, and is not particularly limited herein. As an example, in some cases, including the outermost separation membrane, a part of the separation membrane located at the outer side may break, and the tendency to break increases as the separation membrane located at the outer side.
- the separator has a very thin thickness, and as the tension is eliminated, as shown in FIG. 8, the separator is in close contact with each side of the stepped portion of the electrode assembly, whereby the separator can implement the shape of the stepped portion of the electrode assembly.
- the cutting is not particularly limited and may be performed by various methods. For example, it can cut with a knife, or can cut by means, such as a laser or a heating wire.
- by forming a break line in the separation membrane of the position to be cut by pressing the membrane or heating the separator may be induced to cut the separation membrane at the break line.
- the separation membrane forming the inclined surface at the stepped portion has no tension and is in close contact with each surface of the electrode assembly as shown in FIG. 8, whereby the step of the electrode assembly may be realized to the outside.
- the said cutting position is not specifically limited.
- the stepped portion is the outermost surface of the first electrode laminate, and is horizontally exposed to the outside without facing the second electrode laminate. It has a vertical vertical line (b) of the side cross-section of the second electrode laminate by lamination of the two electrode unit, the horizontal line (a) and the vertical line (b) forms a right angle, the hypotenuse side of the inclined surface of the separation membrane as a side to the right angle ( form a right triangle to appear c). Therefore, the inclined surface c can be cut at a desired position.
- the tension is applied to the separation membrane so that the tension is eliminated, the cut separation membrane c1 is in close contact with the horizontal line a, and the separation membrane c2 is in close contact with the vertical line b.
- the length of the cut separator c1 or c2 is greater than the length of a or b (c1> a or c2> b)
- the separator may be folded. Therefore, the length of the cut separator, that is, the length of c1 or c2 is more preferably cut so that the length of the horizontal line (a) or the vertical line (b). For example, it can cut
- an electrode assembly capable of realizing a step formed by stacking an electrode unit having an area difference by a separator during manufacturing of an electrode assembly as it is can be obtained, and when stored in a battery case by tension of the separator. Difficulty storing can be eliminated, and bending of the lower electrode laminated body like FIG. 6 can be prevented.
- the battery cell of a lithium ion secondary battery or a lithium ion polymer secondary battery can be manufactured.
- the electrode assembly may be embedded in a battery case, and the battery case may be a pouch type.
- the battery case has a stepped portion formed in advance during the pouch forming process according to the shape of the electrode assembly accommodated therein.
- a battery pack including two or more battery cells including the electrode assembly of the present invention can be obtained, and a device including one or more of the battery cells can be obtained.
- the device may be a mobile phone, a portable computer, a smartphone, a smart pad, a netbook, a LEV (Light Electronic Vehicle), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
- LEV Light Electronic Vehicle
- electrode assembly 5 electrode stack
- electrode unit 10 stepped portion
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- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (20)
- 제1 면적을 갖는 2 이상의 제1 전극 유닛 및 상기 제1 면적보다 작은 제2 면적을 갖는 2 이상의 제2 전극 유닛이 장방형의 분리막에 의해 권취되어 적층된 스택앤 폴딩 타입의 전극 조립체로서,상기 전극 조립체는 제1 전극 유닛이 복수개 적층된 제1 전극 적층체 및 제2 전극 유닛이 복수개 적층된 제2 전극 적층체를 포함하고,상기 제1 전극 적층체와 제2 전극 적층체의 면적차에 의해 단차를 갖는 단차부를 포함하며,상기 분리막은 2 이상의 층으로 상기 단차부를 덮으며, 상기 분리막은 상기 단차와 동일한 형상을 갖는 전극 조립체.
- 제 1항에 있어서, 상기 단차부를 덮는 분리막은 각 층의 분리막 두께가 서로 상이한 것인 전극 조립체.
- 제 2항에 있어서, 상기 단차부를 덮는 분리막은 표면에서 내부로 갈수록 분리막 두께가 두꺼워지는 전극 조립체.
- 제 3항에 있어서 상기 단차를 덮는 분리막은 적어도 표면의 1층이 절단되어 있는 것인 전극 조립체.
- 제 1항에 있어서, 상기 단차부를 덮는 분리막의 두께는 전극 적층체 내부에 위치하는 분리막 두께의 95% 이하인 전극 조립체.
- 제 1항에 있어서, 상기 단차부를 덮는 분리막은 연신된 것인 전극 조립체.
- 제 1항에 있어서, 상기 단차부를 덮는 분리막은 모두 절단된 것인 전극 조립체.
- 제 1항에 있어서, 상기 제2 전극 적층체는 제2 전극 유닛 상에 제2 면적보다 작은 면적을 갖는 전극 유닛이 1 이상 적층된 전극 적층체를 포함하며, 2 이상의 단차를 갖는 전극 적층체인 전극 조립체.
- 제 1항에 있어서, 상기 전극 유닛은 단일 전극; 적어도 하나의 양극과 적어도 하나의 음극이 분리막을 경계로 적층된 단위셀; 또는 이들의 조합을 포함하는 전극 조립체.
- 제 9항에 있어서, 상기 단위셀은 젤리-롤형 단위셀, 스택형 단위셀, 라미네이션 앤 스택형 단위셀 및 스택 앤 폴딩형 단위셀로 이루어지는 군으로부터 선택되는 적어도 하나인 전극 조립체.
- 제 1항에 있어서, 상기 제1 전극 적층체의 최상단 전극이 음극인 전극 조립체.
- 제 1항에 있어서, 상기 제1 전극 적층체와 제2 전극 적층체는 서로 상이한 전극이 대면하여 적층된 것인 전극 조립체.
- 제1 면적을 갖는 2 이상의 제1 전극 유닛 및 상기 제1 면적보다 작은 제2 면적을 갖는 2 이상의 전극 유닛을 장방형의 분리막 상에 배열하고, 상기 전극 유닛을 감싸면서 상기 분리막을 권취하되, 대면적 전극 유닛에 의한 대면적 전극 적층체 및 소면적 전극 유닛에 의한 소면적 전극 적층체가 상호 적층되어 단차를 가지며, 동일한 단차에 있어서 소면적 전극 유닛 각각의 말단과 대면적 전극 적층체의 최상단 말단 사이를 덮는 장방형의 분리막에 의해 경사각이 상이한 2 이상의 경사면이 형성된 전극 조립체를 조립하는 단계; 및상기 동일한 단차를 덮는 분리막의 텐션을 해소하여 모든 경사면을 제거하는 단계를 포함하며,상기 텐션이 해소된 분리막은 두께가 서로 상이한 것인 전극 조립체 제조방법.
- 제 13항에 있어서, 상기 텐션이 해소된 분리막은 전극 조립체의 표면에서 내부로 갈수록 분리막의 두께가 두꺼워지는 것인 전극 조립체 제조방법.
- 제 13항에 있어서, 상기 단차를 덮는 분리막의 텐션은 단차를 덮는 분리막을 연신하여 해소하는 것인 전극 조립체 제조방법.
- 제 15항에 있어서, 상기 연신은 단차를 덮는 분리막을 80-100℃의 온도범위로 가열하여 수행하는 것인 전극 조립체 제조방법.
- 제 15항에 있어서, 상기 연신은 단차를 덮는 분리막을 80-100℃ 온도의 지그로 가압하여 수행하는 것인 전극 조립체 제조방법.
- 제 17항에 있어서, 상기 지그는 상기 전극 조립체의 단차와 동일한 형상을 갖는 것인 전극 조립체 제조방법.
- 제 1항 내지 제 12항 중 어느 한 항의 전극 조립체; 및상기 전극 조립체가 수납된 전지 케이스를 포함하는 이차 전지.
- 제 19항에 있어서, 상기 전지 케이스는 상기 전극 조립체와 동일한 형상의 단차를 갖는 것인 이차전지.
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JP2014560874A JP6066226B2 (ja) | 2013-02-08 | 2014-02-06 | 段差が形成された電極組立体、上記電極組立体を含む二次電池及び上記電極組立体の製造方法 |
CN201480000440.5A CN104303355B (zh) | 2013-02-08 | 2014-02-06 | 台阶状电极组件、包括该电极组件的二次电池及制造该电极组件的方法 |
US14/360,829 US10115996B2 (en) | 2013-02-08 | 2014-02-06 | Stepped electrode assembly, secondary battery including the electrode assembly, and method of manufacturing the electrode assembly |
EP14725905.5A EP2874224B1 (en) | 2013-02-08 | 2014-02-06 | Stepped electrode assembly, secondary battery including electrode assembly, and method for manufacturing electrode assembly |
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KR10-2013-0014719 | 2013-02-08 | ||
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KR1020130028331A KR101414092B1 (ko) | 2013-02-08 | 2013-03-15 | 단차가 형성된 전극 조립체, 상기 전극 조립체를 포함하는 이차전지, 전지팩 및 디바이스, 상기 전극 조립체 제조방법 |
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PCT/KR2014/001003 WO2014123362A1 (ko) | 2013-02-08 | 2014-02-06 | 단차가 형성된 전극 조립체, 상기 전극 조립체를 포함하는 이차전지 및 상기 전극 조립체 제조방법 |
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2013
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- 2013-03-15 JP JP2015501568A patent/JP6098904B2/ja active Active
- 2013-03-15 CN CN201380016558.2A patent/CN104428939B/zh active Active
- 2013-03-15 WO PCT/KR2013/002147 patent/WO2014073751A1/ko active Application Filing
- 2013-03-15 US US14/441,727 patent/US10128526B2/en active Active
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Also Published As
Publication number | Publication date |
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US10115996B2 (en) | 2018-10-30 |
CN104303355A (zh) | 2015-01-21 |
WO2014073751A1 (ko) | 2014-05-15 |
JP6066226B2 (ja) | 2017-01-25 |
EP2874224A1 (en) | 2015-05-20 |
EP2874224A4 (en) | 2015-09-09 |
KR101414092B1 (ko) | 2014-07-04 |
JP6098904B2 (ja) | 2017-03-22 |
US20160372781A1 (en) | 2016-12-22 |
CN104303355B (zh) | 2016-03-16 |
US20150288021A1 (en) | 2015-10-08 |
US20190020053A1 (en) | 2019-01-17 |
EP2882024A1 (en) | 2015-06-10 |
JP2015509654A (ja) | 2015-03-30 |
EP2874224B1 (en) | 2017-06-28 |
US10128526B2 (en) | 2018-11-13 |
CN104428939A (zh) | 2015-03-18 |
JP2015514291A (ja) | 2015-05-18 |
CN104428939B (zh) | 2017-04-12 |
EP2882024A4 (en) | 2015-10-14 |
US10923758B2 (en) | 2021-02-16 |
EP2882024B1 (en) | 2017-05-03 |
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