WO2014168397A1 - 라운드 코너를 포함하는 전지셀 - Google Patents
라운드 코너를 포함하는 전지셀 Download PDFInfo
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- WO2014168397A1 WO2014168397A1 PCT/KR2014/003028 KR2014003028W WO2014168397A1 WO 2014168397 A1 WO2014168397 A1 WO 2014168397A1 KR 2014003028 W KR2014003028 W KR 2014003028W WO 2014168397 A1 WO2014168397 A1 WO 2014168397A1
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- Prior art keywords
- battery cell
- battery
- case
- electrode
- unit
- Prior art date
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- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 16
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 6
- 229910001416 lithium ion Inorganic materials 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000004927 fusion Effects 0.000 abstract description 7
- 238000005452 bending Methods 0.000 abstract description 3
- 230000004308 accommodation Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
-
- 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
-
- 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
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic material
-
- 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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
-
- 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 is a battery cell in which a positive electrode, a negative electrode, and an electrode assembly having a separator structure interposed between the positive electrode and the negative electrode are built in a battery case of a laminate sheet including a resin layer and a metal layer.
- a case and a lower case are formed, and at least one of the upper case and the lower case includes an accommodating part in which the electrode assembly is accommodated and a round corner is formed at one or more side edges thereof.
- lithium secondary batteries with high energy density, high operating voltage, and excellent storage and life characteristics are used for various mobile devices as well as various electronic products. It is widely used as an energy source.
- Lithium secondary batteries are largely classified into cylindrical batteries, square batteries, pouch-type batteries, and the like according to their appearance, and may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, and the like depending on the type of electrolyte.
- a pouch type battery refers to a battery in which an electrode assembly and an electrolyte are sealed inside a pouch type case of a laminate sheet including a resin layer and a metal layer.
- the electrode assembly accommodated in the battery case has a structure of jelly-roll type (winding type), stacking type (lamination type), or composite type (stack / folding type).
- FIG. 1 schematically illustrates a structure of a pouch type secondary battery including a stacked electrode assembly.
- an electrode assembly 30 made of a positive electrode, a negative electrode, and a solid electrolyte coating separator disposed therebetween is formed inside the pouch type battery case 20. And two electrode leads 40 and 41 electrically connected to the negative electrode tabs 31 and 32 are sealed to be exposed to the outside.
- the battery case 20 is composed of a case body 21 including a concave shape accommodating portion 23 on which the electrode assembly 30 can be seated, and a cover 22 integrally connected to the body 21. have.
- the battery case 20 is made of a laminate sheet, and is composed of an outer resin layer 20a forming an outermost shell, a barrier metal layer 20b for preventing the penetration of materials, and an inner resin layer 20c for sealing. .
- a plurality of positive electrode tabs 31 and a plurality of negative electrode tabs 32 are fused to each other and coupled to the electrode leads 40 and 41.
- a heat sealer (not shown)
- a short is generated between the heat welder and the electrode leads 40 and 41.
- the insulating film 50 is attached to the upper and lower surfaces of the electrode leads 40 and 41 to prevent it and to secure the sealing property between the electrode leads 40 and 41 and the battery case 20.
- the battery cells are configured to include the electrode assembly of the same size or capacity, in order to make a new structure in consideration of the design of the device to which the battery cell is applied, to reduce the capacity of the battery cell or larger There is a problem in that the design of the device must be changed in size.
- the present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.
- an object of the present invention is to design a battery cell to be mounted in a variety of spaces of the device, to maximize the utilization of the internal space of the device, and to move away from the external structure of the device having a generally rectangular structure It is to provide a battery cell that can be efficiently mounted even in a device having an appearance.
- a battery cell according to the present invention for achieving the above object is a battery cell in which a positive electrode, a negative electrode, and an electrode assembly having a separator structure interposed between the positive electrode and the negative electrode in a battery case of a laminate sheet including a resin layer and a metal layer.
- a battery case of one unit is bent to form an upper case and a lower case
- At least one of the upper case and the lower case is provided with an accommodating part in which the electrode assembly is accommodated and a round corner is formed at one or more side edges;
- an upper side on which at least one of the electrode terminals is positioned a first side side adjacent to the upper side, and a lower side opposite to the upper side, Sealing parts are formed by heat fusion of the case and the lower case, and the second side edge adjacent to the upper side may be formed of a bent structure of the battery case.
- the battery cell according to the present invention can more accurately correspond to the shape including the curve of the device on which the battery cell is mounted by forming a round corner in the housing portion in which the electrode assembly is accommodated, thereby further miniaturizing the device. Can be.
- a battery case of one unit is bent to form an upper case and a lower case, and the electrode assembly is accommodated in an accommodating portion formed in at least one of the upper case and the lower case, and then placed on the upper portion of the lower case.
- the upper case may be covered to seal the outer circumferential surface of the housing to form a seal.
- the positive electrode and the negative electrode of the electrode assembly are respectively connected to the electrode terminals protruding outward of the battery case, and the second side edge adjacent to the upper side from which the electrode terminal protrudes is bent to cover the upper case on the lower case.
- Form a structure, the upper side, the lower side and the first side may be made of a structure that is sealed by heat fusion.
- the number and position of the round corners formed at the corners of the housing is not particularly limited.
- the round corner may be formed at one or more edges that do not contact the upper side.
- a round corner may be formed at an edge between the lower side and the first side, or at an edge between the lower side and the second side.
- the round corner may be formed at the corner of the first side. That is, a round corner may be formed at at least one of the corner between the first side and the upper side, and the corner between the first side and the lower side. At this time, the round corner may form a structure that is formed on the other side except the portion where the battery case is bent and folded.
- the maximum size of the radius of curvature of the round corner may be 50% of the length of the housing portion of the battery case.
- the length of the accommodating part may be the length of one side in the direction in which the electrode lead protrudes, and may be the length of one side in the direction perpendicular to the direction in which the electrode lead protrudes from the battery case.
- the length of one side of the direction in which the electrode lead protrudes may be formed in a structure shorter than the length of one side in the direction perpendicular to the direction in which the electrode lead protrudes, wherein the curvature of the round corner
- the maximum size of the radius may be 50% of the length of the long side of the receiver, and specifically, the radius of curvature of the round corner may be in the range of 5 to 45% of the length of the long side of the receiver.
- a round corner may be formed at the heat-sealed side of the battery case corresponding to a portion where the round corners of the storage unit are formed.
- the width of the heat-sealed side on which the round corner is formed may be formed to have the same structure as the width of the heat-sealed side on which the round corner is not formed. That is, by making the width of the heat-sealed side constant, the structure inside the battery cell is prevented from flowing out through the portion where the round corner is formed when the internal pressure of the battery cell rises.
- the electrode assembly may have a structure in which the positive electrode tabs and the negative electrode tabs protrude in one direction, or the positive electrode tabs protrude on one side and the negative electrode tabs protrude on the opposite side. Accordingly, even in the battery cell incorporating the electrode assembly, the positive electrode terminal and the negative electrode terminal may protrude from the upper side of the battery case, or the positive terminal may protrude from the upper side and the negative electrode terminal may protrude from the lower side.
- the outer surface of the electrode assembly may be formed to have a structure corresponding to the inner surface shape of the housing in order to maximize the capacity of the battery by maximizing the space in the housing of the battery case.
- the electrode assembly may have a structure in which the electrode tabs include two or more unit cells of a structure protruding from each electrode plate.
- the unit cells may be stacked in a height direction with respect to a plane, and at least two or more unit cells may be formed in a structure having a different plane size.
- These unit cells may each have a structure in which round corners are formed at one or more corners.
- the corners at which the round corners of the unit cells are formed may be corners in the same direction.
- the stacking structure of the unit cells is not particularly limited.
- the unit cells may be stacked in an array in which the unit cells are reduced in size from the bottom to the top of the electrode assembly to form a stepped step. Therefore, compared to the prior art of stacking battery cells having different sizes, the dead space can be minimized to increase the battery capacity compared to the same size, which is highly desirable.
- the unit cell of the electrode assembly is not particularly limited as long as it constitutes a positive electrode and a negative electrode, and examples thereof include a stacked structure or a stacked / folding structure. Details of the electrode assembly of the stack / foldable structure are disclosed in Korean Patent Application Publication Nos. 2001-0082058, 2001-0082059, and 2001-0082060, which are described in the context of the present invention. Incorporated by reference.
- the plurality of unit cells are stacked in a height direction with respect to a plane, and at least two or more of the unit cells have different plane sizes, that is, a stacked electrode assembly, any one of an anode and a cathode interposed between separators.
- the positive electrode, the negative electrode, and the separators may include a first unit cell having a structure of being laminated in a stacked state. In this case, one of the separators may constitute a second separator.
- the multilayer electrode assembly may include a second unit cell in which any one of a positive electrode and a negative electrode is interposed between the separators and is laminated in a state in which one of the positive and negative electrodes and the separators are stacked.
- one of the separators may constitute a second separator.
- the first unit cell may be a structure in which a cathode, a separator, a cathode, and a separator are laminated in a sequential stacked state or a structure in which a cathode, a separator, an anode, and a separator are laminated in a sequential stacked state.
- a cathode, a separator, an anode, and a separator are laminated in a sequential stacked state.
- the stacked electrode assembly may include a third unit cell in which a separator is interposed between the positive electrode and the negative electrode, and the positive electrode, the negative electrode, and the separator are laminated in a stacked state.
- the stacked electrode assembly may include a fourth unit cell that is bonded in a state in which one of the anode and the cathode and one separator are stacked.
- the stacked electrode assembly may include any one selected from the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell, or a combination thereof.
- a second unit cell may be stacked at the top or bottom of the first unit cell.
- any one of a positive electrode and a negative electrode may be interposed between the second unit cells.
- Fixing members may be further added to the first to fourth unit cells to more firmly maintain the stack structure of the anode, the separator, and the cathode.
- the fixing member may be an outer member separate from the first unit cell or the second unit cell, and may be an adhesive tape or an adhesive tape covering part or all of the outer circumferential surface of the unit cell.
- the outer circumferential surface of the unit cell may be a concept including all of the side, the plane, the front, and the rear of the unit cell.
- the fixing member may be a part of the separator constituting the unit cell.
- the unit cell may be fixed by thermally fusion bonding the ends of the separator.
- it is not limited thereto.
- the ends of the separator may extend longer than the size of the anode and the cathode, that is, the length or length.
- the ends of the extended separator may be thermally fused to each other.
- the fixing member includes all members capable of fixing the first unit cell or the second unit cell.
- the stacked electrode assembly including the first unit cell and the second unit cell is configured, mass productivity and yield can be improved compared to the stacked electrode assembly having a structure in which a cathode, an anode, and a separator are simply stacked.
- the positive electrode, the separator, and the negative electrode are bonded to each other in units of the first unit cell, there is an advantage of minimizing volume expansion due to swelling.
- the stacked electrode assembly including the first unit cell and the second unit cell
- an alignment defect or process equipment of the electrode assembly implemented by the folding process is removed, and the first unit cell or the first unit cell has only one laminator.
- the formation of the second unit cell is completed, and the stacked electrode assembly can be implemented in a simple stack, thereby reducing electrode damage generated during the folding process, improving electrolyte wettability, and having a separator exposed to the outside.
- the composite separator (SRS separator) can be applied to reduce the thickness of the cell and at the same time reduce the process cost.
- the accommodating part of the battery case may have a structure in which a stepped step shape corresponding to the outer surface shape of the electrode assembly is formed.
- the battery cell according to the present invention can be produced in a battery cell having a variety of capacity and size based on the specific structure as described above, in the manufacture of a device equipped with such a battery cell, the battery cell is a variety of space of the device It can be installed in the system, maximizing the space utilization inside the device.
- the battery cell may be a lithium ion battery or a lithium ion polymer battery cell, but is not limited thereto.
- the present invention also provides a device including the battery cell as a power source, the device is a mobile phone, portable computer, smartphone, tablet PC, smart pad, netbook, LEV (Light Electronic Vehicle), electric vehicle, It may be selected from a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.
- the device is a mobile phone, portable computer, smartphone, tablet PC, smart pad, netbook, LEV (Light Electronic Vehicle), electric vehicle, It may be selected from a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.
- the present invention also provides a battery pack containing two or more of the battery cells as a unit battery. That is, a battery pack having a structure in which two or more battery cells are connected in series and / or in parallel as a unit battery, and the battery pack is a mobile phone, a portable computer, a smartphone, a tablet PC, a smart pad, a netbook, a LEV. Light electronic vehicles, electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices.
- FIG. 1 is a perspective view of a conventional battery cell
- FIG. 2 is a perspective view of a battery cell according to one embodiment of the present invention.
- FIG. 3 is a plan view of the battery cell of FIG. 2;
- FIG. 4 is a perspective view of a battery case of the battery cell of Figure 3;
- FIG. 5 is a plan view of a battery cell according to one embodiment of the present invention.
- FIG. 6 is a vertical sectional view of FIG. 5;
- FIG. 7 is a plan view of a battery cell according to one embodiment of the present invention.
- FIG. 8 illustrates a structure of a first unit cell according to an embodiment of the present invention
- FIG. 9 illustrates a structure of a second unit cell according to an embodiment of the present invention.
- FIG. 10 is a schematic diagram showing a stacked electrode assembly according to one embodiment of the present invention.
- FIG. 11 is a schematic diagram of a fixing structure of the first unit cell of FIG. 8;
- FIG. 12 is a manufacturing process diagram of the first unit cell according to an embodiment of the present invention.
- FIG. 2 is a perspective view of a battery cell according to an embodiment of the present invention
- Figure 3 is a plan view of the battery cell of Figure 2
- Figure 4 is a battery case of the battery cell of Figure 3 A perspective view is shown.
- the battery cell 100 includes a battery case 110 having a round corner 150 formed in the accommodating part 112 and an electrode assembly (not shown) mounted in the accommodating part 112. It is composed of a structure.
- the battery case 110 is a member of the unit is bent to form the upper case 114 and the lower case 115, the upper case 114 is the electrode assembly is accommodated, the round corner 150 at one corner It includes the recessed accommodating part 112 formed.
- the upper side 116 on which the electrode terminals 140 are positioned the first side 117 adjacent to the upper side 116, and the upper side 116 are provided.
- the sealing part 160 by heat fusion of the upper case 114 and the lower case 115 is located, and the second side edge 119 adjacent to the upper side 116 is the battery case 110. It consists of a bending structure.
- the second side edge 119 adjacent to the upper side 116 from which the electrode terminals 140 protrude is bent to form a structure in which the upper case 114 is covered on the lower case 115, and the upper side 116.
- the lower side 118 and the first side 117 is made of a structure that is sealed by heat fusion.
- the round corner 150 is formed at the corner between the first side 117 and the lower side 118, and although not shown in the drawing, may be formed at the corner between the first side 117 and the upper side 116. In addition, round corners may be formed at corners between the first side 117, the upper side 116, and the lower side 118, respectively.
- the heat-sealed side of the portion where the round corner 150 is formed has a round corner corresponding to the shape of the round corner 150 of the accommodating part 110, and the width W1 of the side where the round corner is formed. ) Is formed in the same structure as the width W2 of the heat-sealed side where the round corner is not formed.
- the second side edge 119 is bent to form the upper case 114 and the lower case 115, so that the side edge 111 and the second side edge 119 of the accommodating part 112 positioned in the bending direction are formed.
- the width W3 between is formed in the structure smaller than the width W1 of the side in which the round corner is formed, and the width W2 of the heat-sealed side in which the round corner is not formed. Since the side 111 and the second side 119 of the accommodating portion 112 is not a sealed portion, the width W3 is made relatively small, or the side of the accommodating portion is immediately positioned at the bent portion.
- the width W3 may be formed to be zero.
- a bent structure of the battery case 20 is formed on an opposite side of one side from which the electrode leads 40 and 41 protrude, as in the pouch type secondary battery 10 of FIG. 1, and a bent structure is formed.
- the round corner is formed to include, there is a disadvantage that it is difficult to ensure uniformity for the sealing force of the round corner portion. That is, due to the non-uniform sealing state, when the internal pressure increases in an abnormal situation, the sealing of the relatively weak sealing force may be released.
- the portion in which the round corner 150 is formed and the side 119 in which the bent structure is formed are not formed adjacent to or overlapping each other, thereby uniformly sealing the sealing portion of the round corner 150. It consists of a structure formed to have a force.
- the second side 119 adjacent to the upper side 116 is formed of the bent structure of the battery case 110, the round corner 150 is formed at the corner between the first side 117 and the lower side 118 have.
- the electrode assembly may have a round corner having a structure corresponding to the shape of the accommodating part 110 in which the round corner 150 is formed so as to maximize the space inside the accommodating part.
- FIG. 5 is a plan view of a battery cell according to one embodiment of the present invention
- Figure 6 is a vertical cross-sectional view of FIG.
- the battery cells 200 are vertically stacked with unit cells 212, 214, and 216 having different lengths (AL, BL, CL) and capacities, respectively, and are built in the battery case 220. It is.
- the vertically stacked shape has a structure in which the thickness increases toward the electrode terminal 270 protruding outside the battery case 220.
- the accommodating part has a stepped structure to accommodate the unit cells 212, 214, and 216, and round corners 250 are formed at one side thereof. These round corners 250 are formed in the corner of the same direction of the housing.
- the unit cells 212, 214, and 216 are stacked in a planar sized arrangement from the bottom to the top, and the radius of curvature of the round corners formed in the unit cells 212, 214, and 216 is reduced. It is formed in different structures. That is, the curvature radius of the unit cells has a structure that gradually decreases from the lower to the upper direction.
- the capacities of the unit cells 212, 214, and 226 include the lengths AL, BL, and CL, the heights AH-BH, BH-CH, and the width of the unit cells 212, 214, and 216. Proportional to the product of (not shown).
- the free space S3 is generated at the upper right side by unit cells 212, 214, and 216 having different sizes, which is defined by the unit cells 212, 214, and 216. Inversely proportional to length, height and width.
- This space is to cope with the conditions such as irregular internal space of the application device or interference by other components, and the direction in which the thickness increases and the degree of stacking thickness increase can be flexibly designed and modified to suit the application situation.
- FIG. 7 is a plan view of a battery cell according to an embodiment of the present invention.
- 5 illustrates a structure in which three types of unit cells having different sizes in a plane are stacked, and the accommodating part is formed in three stages.
- the accommodating part 312 also has a two-stage structure, and one side edge of the accommodating part 132 is formed. Round corners 350 having different curvature radii in the direction are formed at each end.
- the unit cells having different planar sizes may be formed in a structure having various numbers of steps, without being limited to a structure in which three or two stages are stacked.
- the first unit cell has a structure in which a separator 310, an anode 320, a separator 330, and a cathode 340 are laminated in a sequentially stacked state.
- the second unit cell has a structure in which the separator 410, the cathode 420, and the separator 430 are sequentially stacked.
- FIG. 10 illustrates a stacked electrode assembly having a structure in which the second unit cell of FIG. 9 is stacked on the top of the first unit cell stack in which the first unit cells of FIG. 9 are stacked.
- FIG. 11 illustrates an embodiment in which a fixing member is further added to the first unit cell of FIG. 9. Specifically, the fixing member T1 is further added to the side or front surface of the first unit cell 300.
- the fixing may be performed by using a separate member on the side of the lamination structure, and the fixing member may be the first unit as shown in FIG. It is possible to implement by taping the front surface of the cell 300, or as shown in 11 (b), it can be implemented by a fixing member (T2) for fixing only the side of the first unit cell (300).
- FIG. 12 is a process schematic diagram illustrating a manufacturing process of a first unit cell according to the present invention.
- the separator 310, the anode 320, the separator 330, and the material of the cathode 340 are simultaneously loaded and the anode 320 used as an intermediate layer. Is cut into the designed size and then loaded, and then the separators 310 and 330 disposed at the top and bottom are simultaneously loaded, and the cathode 340 material is loaded together into the laminators L1 and L2.
- the laminator implements a structure in which two electrode plates and two separators are bonded to each other by heat and pressure, that is, a first unit cell, and then cuts through a cutter C3 to complete the first unit cell, and then checks thickness (a). Inspection process, such as vision inspection (b), short inspection (c) may be further performed.
- the first unit cell thus formed is fixed using a fixing member, or formed into a structure in which a plurality of first unit cells are stacked by stacking, and then stacking the second unit cells of FIG. 13 and through the fixing member.
- the fixing process is to complete the stacked electrode assembly.
- the electrode assembly according to the present invention is formed by stacking unit cells having different sizes and includes rounded corners of a curved structure, thereby more precisely corresponding to a shape including a curve of a device on which the battery cell is mounted. As a result, the device can be further miniaturized.
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- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
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Abstract
Description
Claims (26)
- 수지층과 금속층을 포함하는 라미네이트 시트의 전지케이스에 양극, 음극, 및 상기 양극 및 음극 사이에 개재되는 분리막 구조의 전극조립체가 내장된 전지셀로서,일 단위의 전지케이스가 절곡되어 상부 케이스 및 하부 케이스를 형성하고 있고;상기 상부 케이스 및 하부 케이스 중의 적어도 하나에는, 상기 전극조립체가 수납되고 하나 이상의 측면 모서리에 라운드 코너가 형성되어 있는, 수납부가 형성되어 있으며;상기 전지케이스의 변들(sides) 중에서, 전극단자들 중의 적어도 하나가 위치한 상변(upper side), 상기 상변에 인접한 제 1 측변(lateral side), 및 상기 상변에 대향한 하변(lower side)에, 상부 케이스와 하부 케이스의 열융착에 의한 실링부들이 위치하고, 상기 상변에 인접한 제 2 측변은 전지케이스의 절곡 구조로 이루어진 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 제 2 측변의 위치에서 전지케이스가 절곡되어, 상부 케이스가 나머지 변들에서 하부 케이스와 밀착 및 열융착된 구조인 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 라운드 코너는 상변과 접하지 않는 하나 이상의 모서리(edge)에 형성되어 있는 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 라운드 코너는 제 1 측변의 모서리에 형성되어 있는 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 라운드 코너의 곡률 반경의 최대 크기는 수납부의 장변 길이의 50% 크기인 것을 특징으로 하는 전지셀.
- 제 5 항에 있어서, 상기 라운드 코너의 곡률 반경은 수납부의 장변 길이의 5 내지 45% 범위 내의 크기인 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 수납부의 라운드 코너가 형성된 부위에 대응하는 전지케이스의 열융착된 변에는 라운드 코너가 형성되어 있는 것을 특징으로 하는 전지셀.
- 제 7 항에 있어서, 상기 라운드 코너가 형성되어 있는 열융착된 변의 폭은 라운드 코너가 형성되어 있지 않은 열융착된 변의 폭과 동일한 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 전지케이스의 상변에 양극 단자 및 음극 단자가 돌출되어 있거나, 또는 상변에 양극 단자가 돌출되어 있고 하변에 음극 단자가 돌출되어 있는 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 전극조립체의 외면은 수납부의 내면 형상에 대응하는 구조로 형성되어 있는 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 전극조립체는 전극 탭들이 각각의 극판으로부터 돌출된 구조로 이루어져 있고, 적어도 하나 이상의 모서리에 라운드 코너가 형성되어 있는 단위셀들을 둘 이상 포함하고 있는 것을 특징으로 하는 전지셀.
- 제 11 항에 있어서, 상기 단위셀들은 평면을 기준으로 높이 방향으로 적층되어 있고, 그 중 적어도 둘 이상의 단위셀들은 평면 크기가 서로 다른 것을 특징으로 하는 전지셀.
- 제 11 항에 있어서, 상기 단위셀들의 라운드 코너가 형성된 모서리는 동일한 방향의 모서리인 것을 특징으로 하는 전지셀.
- 제 11 항에 있어서, 상기 단위셀들은 전극조립체의 하부로부터 상부쪽으로 단위셀의 크기가 작아지는 배열로 적층되어 계단 형상의 단차를 형성하는 것을 특징으로 하는 전지셀.
- 제 14 항에 있어서, 상기 단위셀들은 하부로부터 상부쪽으로 라운드 코너의 곡률반경이 점점 작아지는 구조로 적층되어 있는 것을 특징으로 하는 전지셀.
- 제 11 항에 있어서, 상기 전극조립체의 단위셀들은 스택형 구조, 또는 스택/폴딩형 구조로 이루어진 것을 특징으로 하는 전지셀.
- 제 16 항에 있어서, 상기 단위셀은, 양극, 음극 및 양극과 음극 사이에 개재되어 있는 판상의 제 1 분리막을 포함하고, 양극과 음극이 분리막을 사이에 두고 평면을 기준으로 높이 방향으로 적층되어 있는 스택형 단위셀인 것을 특징으로 하는 전지셀.
- 제 17 항에 있어서, 상기 스택형 단위셀은, 양극과 음극 중 어느 하나가 최외각을 구성하고, 최외각 양극과 음극 중 어느 하나가 분리막들 사이에 개재되도록, 양극, 음극, 및 분리막들은 적층된 상태에서 접합(laminate)되어 있는 구조의 제 1 단위셀을 포함하는 것을 특징으로 하는 전지셀.
- 제 17 항에 있어서, 상기 스택형 단위셀은, 분리막들이 최외각을 구성하고, 양극과 음극 중 어느 하나가 분리막들 사이에 개재되도록, 양극, 음극, 분리막이 적층된 상태에서 접합(laminate)되어 있는 구조의 제 2 단위셀을 포함하는 것을 특징으로 하는 전지셀.
- 제 15 항에 있어서, 상기 전지케이스의 수납부에는 전극조립체의 외면 형상에 대응하는 계단 형상의 단차가 형성되어 있는 것을 특징으로 하는 전지셀.
- 제 1 항에 있어서, 상기 전지셀은 리튬이온 전지셀 또는 리튬이온 폴리머 전지셀인 것을 특징으로 하는 전지셀.
- 제 1 항 내지 제 21 항 중 어느 하나에 따른 전지셀을 단위전지로서 둘 이상 포함하고 있는 것을 특징으로 하는 전지팩.
- 제 1 항 내지 제 21 항 중 어느 하나에 따른 전지셀을 전원으로 포함하고 있는 디바이스.
- 제 23 항에 있어서, 상기 디바이스는 휴대폰, 휴대용 컴퓨터, 스마트폰, 태플릿 PC, 스마트 패드, 넷북, LEV(Light Electronic Vehicle), 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 및 전력저장장치로 이루어진 군에서 선택되는 것을 특징으로 하는 디바이스.
- 제 22 항에 따른 전지팩을 전원으로 포함하고 있는 디바이스.
- 제 25 항에 있어서, 상기 디바이스는 휴대폰, 휴대용 컴퓨터, 스마트폰, 태플릿 PC, 스마트 패드, 넷북, LEV, 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 및 전력저장장치로 이루어진 군에서 선택되는 것을 특징으로 하는 디바이스.
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CN201480006565.9A CN105122494B (zh) | 2013-04-11 | 2014-04-08 | 具有圆状角部的电池单体 |
US14/653,054 US9741974B2 (en) | 2013-04-11 | 2014-04-08 | Battery cell having round corner |
JP2015555934A JP6240223B2 (ja) | 2013-04-11 | 2014-04-08 | ラウンドコーナーを含む電池セル |
EP14782417.1A EP2940753B1 (en) | 2013-04-11 | 2014-04-08 | Battery cell having rounded corner |
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- 2014-04-08 EP EP14782417.1A patent/EP2940753B1/en active Active
- 2014-04-08 WO PCT/KR2014/003028 patent/WO2014168397A1/ko active Application Filing
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Also Published As
Publication number | Publication date |
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EP2940753A1 (en) | 2015-11-04 |
KR20140123007A (ko) | 2014-10-21 |
US9741974B2 (en) | 2017-08-22 |
CN105122494B (zh) | 2017-09-19 |
KR20150134304A (ko) | 2015-12-01 |
CN105122494A (zh) | 2015-12-02 |
EP2940753B1 (en) | 2018-02-14 |
US20160020434A1 (en) | 2016-01-21 |
JP6240223B2 (ja) | 2017-11-29 |
JP2016505204A (ja) | 2016-02-18 |
EP2940753A4 (en) | 2016-06-15 |
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