WO2023096347A1 - 파우치형 이차전지 및 이의 제조방법 - Google Patents
파우치형 이차전지 및 이의 제조방법 Download PDFInfo
- Publication number
- WO2023096347A1 WO2023096347A1 PCT/KR2022/018620 KR2022018620W WO2023096347A1 WO 2023096347 A1 WO2023096347 A1 WO 2023096347A1 KR 2022018620 W KR2022018620 W KR 2022018620W WO 2023096347 A1 WO2023096347 A1 WO 2023096347A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pouch
- electrode assembly
- cover member
- type
- secondary battery
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 238000007789 sealing Methods 0.000 claims abstract description 70
- 238000005452 bending Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000002861 polymer material Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 abstract description 40
- 238000000926 separation method Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 13
- 239000010410 layer Substances 0.000 description 12
- -1 polytetrafluoroethylene Polymers 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 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
- 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
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
- H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
-
- 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
- H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
- H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/591—Covers
-
- 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
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
-
- 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
- H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
- H01M50/48—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by the material
- H01M50/486—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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides 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
- 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
-
- 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 pouch type secondary battery and a manufacturing method thereof.
- secondary batteries are classified into cylindrical batteries and prismatic batteries in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries in which the electrode assembly is embedded in a pouch-type battery case made of an aluminum laminate sheet. do.
- the electrode assembly built into the battery case is a power generating device capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode. It is classified into a rolled jelly-roll type and a stack type in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked with a separator interposed between them.
- the electrode assembly 100 is stored inside the battery case 200, and the positive and negative electrode tabs are welded to two lead members 110, respectively, so that the battery case (200) exposed to the outside.
- the battery case 200 for accommodating the electrode assembly 100 has, as shown in FIG. 2 , a lower case 220 and an upper case 210 covering the lower case 220 . It may have an integral structure, and a contact surface between the lower case 220 and the upper case 210 may be bent and folded. Further, the lower case 220 and the upper case 210 each have a laminate structure composed of an inner coating layer, a metal layer, and an outer coating layer.
- the battery case 200 is provided with an electrode assembly accommodating portion 230 recessed inside to accommodate the electrode assembly 100, and the electrode assembly is accommodated in the accommodating portion, and the lower case 220 and the upper case are provided. After folding by bending the surface (dotted line) in contact with 210, forming a sealing portion (S) heat-sealed along the outer periphery of the electrode assembly accommodating portion using a sealing member (not shown), thereby manufacturing a pouch-type secondary battery. can be manufactured
- the sealing part is formed by pressing the area to be sealed at a high temperature using a sealing member, and when the high temperature/pressure is applied by the sealing member, the battery case of the laminate structure is heated and the resin of the inner coating layer is melted, resulting in a two-layer battery.
- the case is thermally fused to form a sealing portion.
- the sealing portion of the battery case is pressed at a high temperature with a sealing member to form a sealing portion, the binder component in the separator protruding from the end of the electrode assembly and the inner coating layer of the battery case are melted together by heat, and the battery case The inner coating layer of may be heat-sealed to the electrode assembly.
- the internal electrode assembly flows and the fluidity force is transmitted to the inner coating layer of the battery case bonded to the electrode assembly, as shown in FIG. 11, the inner coating layer. damage such as cracks may occur, which may cause insulation failure of the battery case.
- the present invention is to solve the above problems, when the sealing part of the pouch type battery is formed, by melting the binder component of the separator, the separator is thermally fused together with the inner coating layer of the battery case, and as a result, the flow of the electrode assembly , To provide a pouch-type secondary battery capable of preventing damage to the inner coating layer of the battery case and a manufacturing method thereof.
- a pouch-type secondary battery is a pouch-type secondary battery having a sealing portion in which a two-layer pouch-type battery case is heat-sealed in a state in which an electrode assembly is housed therein, and four At least one of the thickness surfaces may include a cover member positioned between the thickness surface of the electrode assembly and the pouch type battery case.
- the cover member may be located between a thickness surface of the electrode assembly and a pouch-type battery case along the sealing part.
- the pouch-type battery case has a pouch-type battery case having a pair of storage parts recessed inside in which an electrode assembly is accommodated, and a bending line so that the pair of storage parts are in a symmetrical position.
- the sealing part may be formed along the outer periphery of the housing unit except for the periphery of the bending line.
- the sealing part may be formed along the outer periphery of the accommodating part.
- the cover member may be a heat-resistant polymer material having a melting point (Tm) higher than a thermocompression bonding temperature at the time of forming the sealing part.
- Tm melting point
- the cover member may be in close contact with the thickness surface of the electrode assembly.
- the cover member may have a size that completely covers the thickness surface of the electrode assembly.
- the cover member in an I-shape, may be positioned between the thickness surface and the pouch-type battery case.
- the length of the cover member in the longitudinal direction is greater than the length of the thickness of the electrode assembly, and both ends of the cover member in the thickness direction are bent to cover the thickness surface of the electrode assembly in a U-shape. As, it may be located between the thickness surface and the pouch type battery case.
- the electrode assembly may be one selected from a stack-type electrode assembly, a stack-folding type electrode assembly, a lamination-stack type electrode assembly, and a jelly-roll type electrode assembly.
- a method for manufacturing a pouch-type secondary battery includes preparing an electrode assembly; a cover member preparation step of cutting the cover member; An accommodating step of accommodating the electrode assembly and the cover member in a pouch-type battery case; and a sealing step of thermally compressing and sealing a portion to be sealed of the pouch-type battery case, and in the receiving step, the cover member is formed between a thickness surface of the electrode assembly corresponding to the portion to be sealed and a portion of the pouch-type battery case. stored so as to be placed between them.
- the step of preparing the electrode assembly the assembling step of assembling such that a separator is interposed between the positive electrode and the negative electrode; A welding step of welding the positive tab and the positive lead and the negative tab and the negative lead, respectively; and wrapping the welded portion with a protective film.
- the step of preparing the cover member may include a process of cutting the cover member to a size that covers a thickness plane constituting the thickness of the electrode assembly in an I-shape.
- the step of preparing the cover member may include a process of cutting the cover member to a size that covers a thickness plane constituting the thickness of the electrode assembly in a U-shape.
- the accommodating step may include accommodating the cover member in a state of closely contacting a thickness surface forming the thickness of the electrode assembly corresponding to the area to be sealed.
- a cover member is inserted into the separation space between the electrode assembly and the pouch-type battery case, and the cover member cuts off the separator and the inner coating layer of the battery case, thereby forming a sealing part. Even when the binder component of the separator is melted, adhesion of the separator to the inner coating layer of the battery case is prevented. Accordingly, when the electrode assembly flows, which is a problem of the conventional pouch-type secondary battery, insulation failure due to damage to the inner coating layer is prevented.
- the cover member fills the separation space between the electrode assembly and the pouch, it has an effect of attenuating impact caused by the flow of the electrode assembly.
- FIG. 1 is a perspective view of a pouch type secondary battery according to the prior art.
- Figure 2 is a flow chart for explaining a pouch-type secondary battery manufacturing process according to the prior art.
- FIG. 3 is a schematic diagram of a pouch-type secondary battery according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram and a BB' cross-sectional view of an electrode assembly accommodated inside the pouch-type secondary battery of FIG. 3 .
- FIG. 5 is a cross-sectional view taken along line A-A in FIG. 3;
- FIG. 6 is an exploded view of the pouch type secondary battery of FIG. 3 .
- FIG. 7 is an upper view showing a state in which the cover member is in close contact with the electrode assembly.
- FIG. 8 is a cross-sectional view taken along the line C-C' of FIG. 7 and shows a cover member according to the first embodiment of the present invention.
- FIG. 9 is a cross-sectional view taken along the line C-C′ of FIG. 7 and shows a cover member according to a second embodiment of the present invention.
- FIG. 10 is a flowchart of a method for manufacturing a pouch-type secondary battery according to an embodiment of the present invention.
- 11 is a conceptual diagram for explaining problems of the prior art, where (a) shows before the flow of the secondary battery and (b) shows after the flow of the secondary battery.
- the terms “include” or “have” are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.
- a part such as a layer, film, region, plate, etc. is said to be “on” another part, this includes not only the case where it is “directly on” the other part, but also the case where another part is present in the middle.
- a part such as a layer, film, region, plate, etc.
- being disposed “on” may include the case of being disposed not only on the top but also on the bottom.
- FIG. 3 is a schematic diagram of a pouch-type secondary battery according to an embodiment of the present invention
- FIG. 4 is a schematic diagram and a BB′ cross-sectional view of an electrode assembly accommodated inside the pouch-type secondary battery of FIG. 3, and FIG. 3, and
- FIG. 6 is an exploded view of the pouch-type secondary battery of FIG.
- a pouch-type secondary battery (B) may include a pouch-type battery case 200 and an electrode assembly 100 accommodated inside the pouch-type battery case. .
- the pouch-type battery case 200 is for hermetically accommodating the electrode assembly 100, and includes a pair of recessed housings 230 in which the electrode assembly 100 is accommodated; 231 and 232), and the pair of housing parts 230; 231 and 232 may be bent along a bending line L-L' so that they are in a symmetrical position.
- the pouch-type secondary battery (B) is a two-layered pouch-type battery case in a state in which the electrode assembly 100 is accommodated in a storage unit provided in the pouch-type battery case 200 200 is provided with a heat-sealed sealing portion (S), and on at least one or more of the four thickness surfaces (T) constituting the thickness of the electrode assembly 100, the thickness surface (T) of the electrode assembly and the pouch type A cover member 300 positioned between the battery case 200 is included.
- the pouch-type secondary battery (B) has a sealing portion (S) of the outer periphery of the housing portions 231 and 232, the bending line (L-L') may be formed along the outer periphery except for the periphery.
- the sealing portion S may not be formed at the corresponding portion as shown in FIG.
- the electrode assembly 100 of the present invention may have a structure in which at least one basic unit 10 of the anode 11 / separator 12 / cathode 13 / separator 12 structure is stacked.
- the side surface of the electrode assembly made along becomes the thickness plane (T).
- the thickness plane T may have a separator 12 cut relatively longer than the positive electrode 11 and the negative electrode 13 protruding from the ends of the positive electrode 11 and the negative electrode 13. . Therefore, in order to form the sealing part (S), when the sealing portion of the battery case 200 is pressed at a high temperature, the binder component of the separator 12 and the inner coating layer constituting the battery case 200 are melted together. , In the thickness plane (T), the separator 10 may be melt-bonded together with the inner coating layer of the sealing portion (S) of the battery case 200.
- the sealing portion (S) when forming the sealing portion (S) by interposing the cover member 300 between the thickness surface (T) of the electrode assembly 100 and the pouch-type battery case 200, ) is prevented from being melted and adhered to the inner coating layer of the battery case 200, and thus, even if the electrode assembly flows, the inner coating layer of the battery case 200 is not damaged and the risk of insulation failure can be prevented.
- the cover member 300 serves to disconnect between the separator 12 and the inner coating layer of the pouch-type battery case 200, and as shown in FIG. 4, the separator 12 is the electrode assembly 100 Since the thickness plane (T) constituting the thickness protrudes to the outside of the electrode, the cover member 300 is within the space between the thickness plane (T) of the electrode assembly 100 and the pouch-type battery case 200. Located.
- the cover member 300 should prevent the binder of the separator 12 from being melted and adhered to the inner coating layer around the sealing part in the sealing process for forming the sealing portion S, so the cover member 300 is preferably located between the thickness surface (T) of the electrode assembly 100 and the pouch-type battery case 200 along the sealing portion (S).
- the sealing portion S may be formed along the outer periphery of the accommodating portion in which the electrode assembly 100 is accommodated, except for the bending line L-L'.
- the cover member 300 is interposed to prevent the binder of the separator and the inner coating layer of the battery case from being thermally fused together in the sealing process of heat-sealing the two-layer battery case, so the cover member is the sealing portion (S) It is preferable to be interposed along the entire area of the.
- the cover member 300 is inserted into a spaced space between the thickness surface T of the electrode assembly 100 and the pouch-type battery case 200, and the electrode assembly 100 Direct contact between the separator 12 at the end and the pouch-type battery case 200 may be prevented. Accordingly, when forming the sealing portion S, it is possible to suppress the temperature increase of the separation membrane 12 due to the temperature increase of the sealing portion S to some extent, and even if the binder component included in the separation membrane 12 is melted, the cover member Since (300) disconnects the separator 12 and the inner coating layer of the battery case 200, adhesion of the separator 12 to the inner coating layer of the battery case 200 is prevented.
- the cover member 300 since the cover member 300 is inserted into the separation space between the electrode assembly 100 and the pouch-type battery case 200, it fills the separation space and serves to reduce the impact caused by the flow of the electrode assembly. can do.
- the cover member is preferably a heat-resistant material that does not melt during a sealing process for forming a sealing portion. That is, the cover member is preferably a heat-resistant polymer material whose melting point (Tm) is higher than the thermal compression temperature at the time of forming the sealing portion. In addition, the cover member is preferably a polymeric material having insulating properties, and may be in the form of a film.
- the separator-cover member-inner coating layer of the electrode assembly can be melt-bonded, so that when the electrode assembly flows, the flow shock is transmitted to the inner coating layer, This is because the inner coating layer may be damaged.
- the melting point of the cover member is preferably a polymer material having a melting point of 180 ° C to 300 ° C, but is not limited thereto.
- the heat-resistant polymer material having a melting point within the above temperature range include polyimide, polytetrafluoroethylene, polyethylene teriphthalate, polycarbonate, polyphenylsulfide, Teflon, acrylonitrile butadiene styrene, polyacrylate, and the like.
- the cover member may include one or two or more selected from the group consisting of the polymer resin.
- cover member 300 is interposed at a position where it can contact the electrode lead 110 as shown in FIG. it is desirable That is, a conductive material such as metal does not melt at a high temperature, preventing the internal coating layer of the battery case from being thermally fused to the electrode assembly, but may cause an internal short circuit when in contact with the electrode lead 110, It is not suitable as a material for the cover member 300 of the present invention.
- the cover member 300 may be in close contact with the thickness surface T of the electrode assembly 100 as shown in FIG. 7 . That is, the cover member 300 is located close to the thickness plane T so that no free space is formed between the cover member 300 and the electrode assembly 100 . When there is a free space between the cover member and the thickness surface, it is not preferable because the separator may protrude through the free space and invade the space between the cover member and the pouch case.
- the size of the cover member is preferably such that the cover member completely covers the thickness surface of the electrode assembly so as to block contact of the separator with the inner coating layer of the pouch type battery case. Accordingly, the length of the cover member in the longitudinal direction may be 100% to 150%, 100% to 130%, or 100% to 120% of the thickness of the electrode assembly.
- the vertical direction of the cover member is the thickness direction of the electrode assembly.
- FIG. 8 is a cross-sectional view along the line C-C′ of FIG. 7, illustrating a shape of a cover member according to an embodiment of the present invention.
- the cover member according to an embodiment of the present invention has a length in the vertical direction corresponding to the thickness of the electrode assembly, and the thickness surface of the electrode assembly is formed in an I-shape to form a thickness surface. It may be located between the pouch type battery case.
- the electrode assembly 100 accommodated in the battery case 200 is a jelly-roll type electrode assembly having a structure in which a separator is interposed between a long sheet-shaped positive electrode and a negative electrode and then wound up, or a rectangular positive electrode assembly. and a stacked electrode assembly composed of unit cells in which a negative electrode is stacked with a separator interposed therebetween, a stack-folding electrode assembly in which the unit cells are wound by a long separator film, and the unit cells form a separator. It may be one selected from the group consisting of lamination-stack type electrode assemblies that are stacked in a state interposed therebetween and attached to each other.
- the electrode assembly 100 may include an electrode lead 110 composed of an anode lead and a cathode lead.
- the positive lead is welded to the positive tab
- the negative lead is welded to the negative tab, and each of the positive lead and the negative lead may be exposed to the outside of the battery case 200 .
- the drawing directions of the positive lead and the negative lead may be the same or opposite to each other.
- anode lead and the cathode lead are made of a metallic material, a pair of insulating films (not shown) facing each other may be positioned in the sealing portion 230 where the anode lead and the cathode lead are located so as to ensure insulation and sealing properties.
- Each of the anode lead and the cathode lead may be disposed to pass between a pair of insulating films (not shown).
- the pouch-type battery case 200 may have a laminate structure composed of an inner coating layer, a metal layer, and an outer coating layer. Since the inner coating layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and must have sealing property, that is, a sealing portion where the inner layers are thermally bonded to each other to seal with the outside, must have excellent thermal bonding strength.
- Materials for the inner coating layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties, but are not limited thereto, Polypropylene (PP), which has excellent chemical resistance and mechanical properties such as tensile strength, stiffness, surface hardness, and impact resistance, is most preferred.
- polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties, but are not limited thereto, Polypropylene (PP), which has excellent chemical resistance and mechanical properties such as tensile strength, stiffness, surface hardness, and impact resistance, is most preferred.
- PP Polypropylene
- an outer coating layer is provided on the other side of the metal layer, and the outer coating layer can use a heat-resistant polymer having excellent tensile strength, moisture permeability, and air permeability to secure heat resistance and chemical resistance while protecting the electrode assembly,
- a heat-resistant polymer having excellent tensile strength, moisture permeability, and air permeability to secure heat resistance and chemical resistance while protecting the electrode assembly
- nylon or polyethylene terephthalate may be used, but is not limited thereto.
- FIG. 9 is a cross-sectional view taken along the line C-C′ of FIG. 7, showing a shape of a cover member according to a second embodiment of the present invention.
- the length of the cover member in the longitudinal direction is greater than the thickness length of the electrode assembly, and the cover member has both ends in the thickness direction.
- E, E' may be bent to form a U shape surrounding the thickness surface of the electrode assembly, and may be positioned between the thickness surface of the electrode assembly and the pouch-type battery case.
- the second embodiment differs from the first embodiment only in the shape of the cover member, further detailed description is omitted.
- a method for manufacturing a pouch-type secondary battery according to the present invention includes the steps of (S10) preparing an electrode assembly; (S20) a cover member preparation step of cutting the cover member; (S30) an accommodating step of accommodating the electrode assembly and the cover member in a pouch-type battery case; and (S40) a sealing step of sealing the area to be sealed of the pouch type battery case by thermal compression bonding.
- the preparing of the electrode assembly may be a step of preparing the electrode assembly 100 in which the electrode lead 110 is coupled to an electrode tab (not shown).
- This electrode assembly has a structure in which a plurality of electrodes 11 and 13 and a plurality of separators 12 are alternately stacked, and electrode tabs (not shown) are provided on the plurality of electrodes 11 and 13, respectively.
- An electrode lead 110 is coupled to an electrode tab (not shown).
- the plurality of electrodes may be positive and negative electrodes
- the electrode tab may be a positive electrode tab provided on the positive electrode and a negative electrode tab provided on the negative electrode.
- the electrode lead 110 may be a positive lead coupled to a positive tab and a negative lead coupled to a negative tab.
- the electrode lead is for connecting an external device and the electrode assembly, and in the later storage step (S30), the tip of the electrode lead is drawn out of the pouch-type battery case.
- the (S10) step of preparing the electrode assembly may include: (S11) an assembling step of assembling such that a separator is interposed between the anode and the cathode; (S12) a welding step of welding the positive tab and the positive lead and the negative tab and the negative lead, respectively; And (S13) may include the step of wrapping the welded portion with a protective film.
- the step of preparing the cover member (S20) is a step of preparing the cover member by cutting it into an appropriate size.
- the cover member is preferably a heat-resistant polymer material having a melting point (Tm) higher than the thermal compression temperature at the time of forming the sealing portion, has insulating performance, and may be in the form of a film.
- a length of the cover member in a longitudinal direction may be 100 to 150% of a thickness of the electrode assembly.
- the step of preparing the cover member may include cutting the cover member to a size that covers a thickness plane constituting the thickness of the electrode assembly in an I-shape.
- the cover member in the preparing of the cover member, may be cut to a size that covers a thickness plane of the electrode assembly in a U-shape.
- the accommodating step (S40) is a step of accommodating the electrode assembly and the cover member in a pouch-type battery case.
- the cover member 300 is placed on the thickness surface of the electrode assembly 100 so that the cover member 300 is positioned between the thickness surface corresponding to the sealing part and the pouch type battery case.
- the cover member and the electrode assembly may be accommodated inside the pouch-type battery case.
- the sealing step (S40) is a step of forming a sealing portion by thermally compressing a portion to be sealed of the edge portion of the electrode assembly accommodating portion.
- the area to be sealed of the upper case and the area to be sealed of the lower case are brought into close contact, and the area to be sealed is located above the area to be sealed in the upper case and below the area to be sealed in the lower case.
- heat pressure is applied with a predetermined force so that the upper case and the lower case can come into close contact. Accordingly, the sealing portion is formed while the inner coating layer of the area to be sealed is melted under thermal pressure.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (16)
- 전극조립체를 수납한 상태에서, 두 겹의 파우치형 전지케이스가 열융착된 실링부를 구비한 파우치형 이차전지로서,전극조립체의 두께를 이루는 네 개의 두께면들 중의 적어도 한 개 이상에서, 전극조립체의 두께면과 파우치형 전지케이스의 사이에 위치하는 커버 부재를 포함하는 파우치형 이차전지.
- 제 1 항에 있어서,상기 커버 부재는,상기 실링부를 따라, 상기 전극조립체의 두께면과, 파우치형 전지케이스의 사이에 위치하는 파우치형 이차전지.
- 제 1 항에 있어서,상기 파우치형 전지케이스는,전극조립체가 수납되는 내부 만입된 한 쌍의 수납부를 구비한 파우치형 전지케이스를, 상기 한 쌍의 수납부가 대칭 위치에 있도록 하는 절곡선을 따라 절곡된 형태이고,상기 실링부는, 상기 수납부의 외주변 중 상기 절곡선 주변을 제외한 나머지 외주변을 따라 형성된 파우치형 이차전지.
- 제 1 항에 있어서,상기 실링부는,상기 수납부의 외주변을 따라 형성된 파우치형 이차전지.
- 제 1 항에 있어서,상기 커버 부재는,융점(Tm)이, 실링부 형성 시의 열압착 온도 보다 높은 내열성 고분자 소재인 파우치형 이차전지.
- 제 1 항에 있어서,상기 커버 부재는,상기 전극조립체의 두께면에 밀착되어 있는 파우치형 이차전지.
- 제 1 항에 있어서,상기 커버 부재는,커버 부재가 전극조립체의 두께면을 완전히 덮을 수 있는 크기를 가지는 파우치형 이차전지.
- 제 7 항에 있어서,상기 커버 부재의 세로 방향 길이는, 상기 전극조립체의 두께 길이와 대응되는 길이를 가지고 있으며,상기 커버 부재는, I자 형태로, 두께면과 파우치형 전지케이스의 사이에 위치하는 파우치형 이차전지.
- 제 7 항에 있어서,상기 커버 부재의 세로 방향 길이가, 상기 전극조립체의 두께 길이보다 크고,상기 커버 부재는, 두께 방향의 양측 단부가 절곡되어, 전극조립체의 두께면을 감싸는 U자 형태로, 두께면과 파우치형 전지케이스의 사이에 위치하는 파우치형 이차전지.
- 제 1 항에 있어서,상기 전극조립체는 스택형 전극조립체, 스택-폴딩형 전극 조립체, 라미네이션-스택형 전극조립체 및 젤리-롤형 전극조립체 중에서 선택된 하나인 파우치형 이차전지.
- 전극조립체를 준비하는 단계;커버 부재를 재단하는 커버 부재 준비 단계;상기 전극조립체와 상기 커버 부재를 파우치형 전지케이스의 내부에 수납하는 수납 단계; 및파우치형 전지케이스의 실링 예정 부위를 열압착하여 실링하는 실링 단계를 포함하고,상기 수납 단계에서, 상기 커버 부재는, 상기 실링 예정 부위에 대응하는 전극조립체의 두께면과, 파우치형 전지케이스의 사이에 위치하도록 수납되는 것을 특징으로 하는 파우치형 이차전지의 제조방법.
- 제 11 항에 있어서,상기 전극조립체를 준비하는 단계는,양극과 음극의 사이에 분리막이 개재되도록, 조립하는 조립 단계;양극 탭과 양극 리드 및 음극 탭과 음극 리드를 각각 용접하는 용접 단계; 및용접부를 보호필름으로 감싸는 단계를 포함하는 파우치형 이차전지의 제조방법.
- 제 11 항에 있어서,상기 커버 부재는,융점(Tm)이, 상기 실링 단계에서의 열압착 온도 보다 높은 내열성 고분자 소재인 파우치형 이차전지의 제조방법.
- 제 11 항에 있어서,상기 커버 부재 준비 단계는,상기 커버 부재가, 전극조립체의 두께를 이루는 두께면을, I자 형태로 커버하는 크기로 재단하는 과정을 포함하는 파우치형 이차전지의 제조방법.
- 제 11 항에 있어서,상기 커버 부재 준비 단계는,상기 커버 부재가, 전극조립체의 두께를 이루는 두께면을, U자 형태로 커버하는 크기로 재단하는 과정을 포함하는 파우치형 이차전지의 제조방법.
- 제 11 항에 있어서,상기 수납 단계는,상기 커버 부재를, 실링 예정 부위에 대응하는 전극조립체의 두께를 이루는 두께면에 밀착시킨 상태로 수납하는 파우치형 이차전지의 제조방법.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22899029.7A EP4258461A4 (en) | 2021-11-23 | 2022-11-23 | BAG-TYPE SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF |
CN202280009098.XA CN116686162A (zh) | 2021-11-23 | 2022-11-23 | 袋型二次电池及其制造方法 |
JP2023541356A JP2024502457A (ja) | 2021-11-23 | 2022-11-23 | パウチ型二次電池およびその製造方法 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2021-0162724 | 2021-11-23 | ||
KR20210162724 | 2021-11-23 | ||
KR1020220157528A KR20230076103A (ko) | 2021-11-23 | 2022-11-22 | 파우치형 이차전지 및 이의 제조방법 |
KR10-2022-0157528 | 2022-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023096347A1 true WO2023096347A1 (ko) | 2023-06-01 |
Family
ID=86540041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2022/018620 WO2023096347A1 (ko) | 2021-11-23 | 2022-11-23 | 파우치형 이차전지 및 이의 제조방법 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4258461A4 (ko) |
JP (1) | JP2024502457A (ko) |
WO (1) | WO2023096347A1 (ko) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20080038465A (ko) * | 2006-10-30 | 2008-05-07 | 주식회사 엘지화학 | 구조적 안정성과 절연저항성이 우수한 전지셀 |
US20090258293A1 (en) * | 2004-10-01 | 2009-10-15 | Samsung Sdi Co., Ltd. | Pouch type rechargeable battery |
WO2017078412A1 (ko) * | 2015-11-02 | 2017-05-11 | 주식회사 코캄 | 파우치 타입 이차전지 |
KR20170070469A (ko) * | 2015-12-14 | 2017-06-22 | 주식회사 엘지화학 | 측면 보강부재를 포함하는 전지셀 |
KR20180117783A (ko) * | 2017-04-20 | 2018-10-30 | 주식회사 엘지화학 | 내부 단락을 방지할 수 있는 보호부재를 포함하고 있는 파우치형 전지셀 |
KR20220157528A (ko) | 2021-05-21 | 2022-11-29 | 주식회사 유사이언스 | 2d 레이저 패턴 기반 정맥 파인더 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101905077B1 (ko) * | 2012-01-19 | 2018-10-05 | 삼성에스디아이 주식회사 | 배터리 셀용 보강물 및 배터리 셀 |
KR102580236B1 (ko) * | 2015-11-20 | 2023-09-19 | 삼성에스디아이 주식회사 | 이차전지 |
KR102186737B1 (ko) * | 2016-12-12 | 2020-12-04 | 주식회사 엘지화학 | 보호 부재를 포함하고 있는 전지셀 |
-
2022
- 2022-11-23 JP JP2023541356A patent/JP2024502457A/ja active Pending
- 2022-11-23 WO PCT/KR2022/018620 patent/WO2023096347A1/ko active Application Filing
- 2022-11-23 EP EP22899029.7A patent/EP4258461A4/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090258293A1 (en) * | 2004-10-01 | 2009-10-15 | Samsung Sdi Co., Ltd. | Pouch type rechargeable battery |
KR20080038465A (ko) * | 2006-10-30 | 2008-05-07 | 주식회사 엘지화학 | 구조적 안정성과 절연저항성이 우수한 전지셀 |
WO2017078412A1 (ko) * | 2015-11-02 | 2017-05-11 | 주식회사 코캄 | 파우치 타입 이차전지 |
KR20170070469A (ko) * | 2015-12-14 | 2017-06-22 | 주식회사 엘지화학 | 측면 보강부재를 포함하는 전지셀 |
KR20180117783A (ko) * | 2017-04-20 | 2018-10-30 | 주식회사 엘지화학 | 내부 단락을 방지할 수 있는 보호부재를 포함하고 있는 파우치형 전지셀 |
KR20220157528A (ko) | 2021-05-21 | 2022-11-29 | 주식회사 유사이언스 | 2d 레이저 패턴 기반 정맥 파인더 |
Non-Patent Citations (1)
Title |
---|
See also references of EP4258461A4 |
Also Published As
Publication number | Publication date |
---|---|
JP2024502457A (ja) | 2024-01-19 |
EP4258461A1 (en) | 2023-10-11 |
EP4258461A4 (en) | 2024-08-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2019208911A1 (ko) | 가스배출수단이 구비된 파우치형 이차전지 | |
WO2018034425A1 (ko) | 이차 전지 | |
WO2014073751A1 (ko) | 단차가 형성된 전극 조립체, 상기 전극 조립체를 포함하는 이차전지, 전지팩 및 디바이스, 상기 전극 조립체 제조방법 | |
WO2020071717A1 (ko) | 이차전지 | |
WO2020251134A1 (ko) | 다층 구조의 전지케이스를 갖는 원통형 이차전지 및 그 제조방법 | |
WO2010134788A2 (ko) | 내수성 파우치형 이차전지 | |
WO2019098522A1 (ko) | 미실링부를 갖는 파우치 타입 이차 전지 | |
WO2018203593A1 (ko) | 배터리 팩 및 이의 제조방법 | |
WO2020101353A1 (ko) | 파우치 케이스 및 이를 포함하는 파우치형 이차 전지의 제조 방법 | |
WO2020111646A1 (ko) | 캡조립체, 이차전지 및 그의 제조방법, 전지팩 | |
WO2019139282A1 (ko) | 전극 탭-리드 결합부에 적용된 플라스틱 부재를 포함하는 전극조립체 및 이를 포함하는 이차전지 | |
WO2021033939A1 (ko) | 이차 전지 | |
WO2018221836A1 (ko) | 배터리 팩 및 이의 제조방법 | |
WO2018080080A1 (ko) | 이차 전지 | |
WO2022191612A1 (ko) | 전지셀 및 이를 제조하는 전지셀 제조 장치 | |
WO2020060022A1 (ko) | 전극조립체 | |
WO2020171372A1 (ko) | 이차 전지 및 그의 제조 방법 | |
WO2023096347A1 (ko) | 파우치형 이차전지 및 이의 제조방법 | |
WO2023085850A1 (ko) | 전지 조립체 제조방법, 전지 조립체 및 이를 포함하는 이차 전지 | |
WO2023014071A1 (ko) | 전극리드 일체형 전극조립체 및 이의 제조방법 | |
WO2022085917A1 (ko) | 전극 탭 고정부를 포함하는 용접장치 및 이를 이용한 전극 탭 용접 방법 | |
WO2018074846A1 (ko) | 이차 전지 | |
WO2021153922A1 (ko) | 이차전지 및 이차전지의 제조 방법 | |
WO2017188563A1 (ko) | 보호부재를 갖는 이차 전지 | |
WO2017217603A1 (ko) | 전극 조립체 및 이를 포함하는 이차 전지 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 202280009098.X Country of ref document: CN Ref document number: 2023541356 Country of ref document: JP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22899029 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18272169 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2022899029 Country of ref document: EP Effective date: 20230706 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |