WO2023090887A1 - 파우치형 리튬 이차전지 - Google Patents
파우치형 리튬 이차전지 Download PDFInfo
- Publication number
- WO2023090887A1 WO2023090887A1 PCT/KR2022/018177 KR2022018177W WO2023090887A1 WO 2023090887 A1 WO2023090887 A1 WO 2023090887A1 KR 2022018177 W KR2022018177 W KR 2022018177W WO 2023090887 A1 WO2023090887 A1 WO 2023090887A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pouch
- secondary battery
- lead tab
- lithium secondary
- electrode
- Prior art date
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 56
- 238000007789 sealing Methods 0.000 claims abstract description 24
- -1 polyethylene Polymers 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical group [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 claims description 5
- 229920005992 thermoplastic resin Polymers 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 210000001787 dendrite Anatomy 0.000 description 9
- 210000004027 cell Anatomy 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920008285 Poly(ether ketone) PEK Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000006182 cathode active material Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 229910021450 lithium metal oxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-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
- H01M50/10—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
- H01M50/117—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
- H01M50/10—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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
-
- 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
Definitions
- the present invention relates to a pouch type lithium secondary battery.
- types of secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, lithium ion batteries, and lithium ion polymer batteries. These secondary batteries are used not only for small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, portable game devices, power tools and E-bikes, but also for large products requiring high power such as electric vehicles and hybrid vehicles. It is applied and used to a power storage device for storing generated power or renewable energy and a power storage device for backup.
- the lithium secondary battery is generally composed of a positive electrode, a separator, and a negative electrode, and materials thereof are selected in consideration of battery life, charge/discharge capacity, temperature characteristics, and stability.
- the lithium secondary battery is charged and discharged while repeating processes of intercalation and deintercalation of lithium ions from lithium metal oxide at the cathode to the graphite electrode at the anode.
- lithium secondary batteries have a three-layer structure of positive electrode / separator / negative electrode, or a five-layer structure of positive electrode / separator / negative electrode / separator / positive electrode or negative electrode / separator / positive electrode / separator / negative electrode. It has been designed.
- each layer of the cathode or anode is laminated with the same amount of electrode active material applied thereto, so that each cathode and anode have the same thickness.
- the above unit cells are gathered to form one electrode assembly or secondary battery.
- an electrode lead is connected to the electrode tab to form an electrode terminal.
- a bidirectional cell when configuring a battery pack, it occupies more space than a unidirectional cell, and thus has a disadvantage in that energy density is lowered.
- the electrode tabs of the positive electrode and the negative electrode are formed in the same direction, so that lithium dendrites precipitated from the negative electrode as the battery is charged and discharged are grounded to the electrode tab of the positive electrode, thereby preventing a short circuit. problems may occur.
- Patent Document 1 Korean Patent Publication No. 2006-0118955
- the inventors of the present invention conducted various studies to solve the above problems, and as a result, in a pouch-type lithium secondary battery in which a positive electrode lead tab and a negative electrode lead tab are formed at one end of the positive electrode and the negative electrode, respectively, the length of the separator located between the positive electrode and the negative electrode is controlled so that the separator protrudes from the end of the positive electrode, but the length of the protruding portion of the separator is controlled to a maximum of the sealing portion located along the edge of the pouch, thereby preventing a short circuit between the positive electrode and the negative electrode. Therefore, it was confirmed that the safety and lifespan characteristics of the battery can be improved.
- an object of the present invention is to provide a pouch type lithium secondary battery having a structure capable of preventing a short circuit between a positive electrode and a negative electrode.
- an electrode assembly consisting of an anode, a separator and a cathode
- a secondary battery including an electrode lead tab electrically connected to the electrode assembly
- the electrode lead tab has a positive lead tab and a negative lead tab
- the pouch has a sealing portion at an edge and a junction portion for sealing portions where the positive lead tab and the negative lead tab protrude to the outside of the pouch through the sealing portion,
- the separator protrudes from one end of the positive electrode, and the length of the protruding portion is less than or equal to the length from one end of the positive electrode to the sealing portion.
- the positive electrode has a positive lead tab electrically connected to one end
- the negative electrode has a negative lead tab electrically connected to one end
- the positive lead tab and the negative lead tab electrically connect the positive and negative electrodes in the same or opposite directions. It may be that it is connected to.
- the pouch may be an aluminum pouch.
- the bonding portion may include a thermoplastic resin.
- a portion of the protruding portion of the separator may have an insulating layer.
- the insulating layer may be formed on one side or both sides of the separator.
- the insulating layer may include at least one selected from the group consisting of polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET).
- PE polyethylene
- PP polypropylene
- PET polyethylene terephthalate
- One end of the separator may partially protrude to overlap with the anode lead tab or may be wrapped around the anode lead tab.
- the negative electrode may be a lithium negative electrode.
- the lithium secondary battery may be a lithium-sulfur secondary battery.
- a separator protrudes from one end of the positive electrode, thereby removing lithium dendrites from the negative electrode during battery operation. Even if grows, it is possible to structurally minimize the contact between the lithium dendrite and the positive electrode to prevent a short circuit between the positive electrode and the negative electrode, and improve the stability and lifespan characteristics of the battery.
- FIG. 1 is a schematic diagram showing a cross-section of an electrode assembly included in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention.
- FIG. 2 is a partial schematic diagram showing protruding portions of a positive electrode lead tab and a negative electrode lead tab in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention
- FIG 3 is an exploded view of an electrode assembly included in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention.
- FIG. 4 is an exploded view of an electrode assembly included in a pouch-type lithium secondary battery according to another preferred embodiment of the present invention.
- the present invention relates to a pouch-type lithium secondary battery, and in a pouch-type lithium secondary battery including an electrode assembly in which a positive electrode, a separator, and a negative electrode are sequentially stacked, lithium grows from the negative electrode during charging and discharging by controlling the length of the separator. It relates to a lithium secondary battery having a structure that prevents a short circuit between a positive electrode and a negative electrode caused by dendrites.
- FIG. 1 is a schematic diagram showing a cross-section of an electrode assembly included in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention.
- the electrode assembly 10 included in the pouch-type lithium secondary battery 1 of the present invention has a form in which a positive electrode 100, a separator 300, and a negative electrode 200 are sequentially stacked, and the separator It is characterized in that the length of (300) is longer than the length of anode (100). In addition, the length of the separator 300 may be longer than the length of the negative electrode 200 .
- the separator 300 is longer than the positive electrode 100, it protrudes from one end of the positive electrode 100. In addition, since the separator 300 may be longer than the cathode 200, it may protrude from one end of the cathode 200.
- the positive electrode is electrically connected to the positive lead tab only at one end
- the negative electrode is also electrically connected to the negative electrode lead tab only at one end.
- directions in which the positive electrode lead tab and the negative lead tab are connected to the positive electrode and the negative electrode may be in the same direction or opposite directions.
- FIG. 2 is a partial schematic diagram showing a protruding portion of a positive electrode lead tab and a negative electrode lead tab in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention, which may be a cross-sectional view of the pouch-type lithium secondary battery.
- 3 is an exploded view of an electrode assembly included in a pouch-type lithium secondary battery according to a preferred embodiment of the present invention.
- an electrode assembly 10 in which a positive electrode 100, a separator 300, and a negative electrode 200 are stacked is stored in a pouch 300.
- the separator 300 included in the electrode assembly 10 included in the pouch-type lithium secondary battery 1 is longer than the positive electrode 100, and specifically, one end of the positive electrode 100 As a reference, it protrudes as much as d, which is the length of the protruding part of the separation membrane 300.
- the separator 300 may protrude from one end of the positive electrode 100 (not shown).
- the length of the protruding portion of the separator 300 may be equal to or less than the length from one end of the anode to the sealing portion 310 .
- the length (d) of the protruding portion of the separator 300 is equal to or less than the length (H) from one end of the anode 100 to the sealing portion 310, specifically, the inner surface of the sealing portion 310 ( d ⁇ H). More specifically, d ⁇ H, d ⁇ 0.9 * H, d ⁇ 0.7 * H, d ⁇ 0.5 * H or d ⁇ 0.5 * H.
- the lower limit of d is not particularly limited as long as it is greater than 0. For example, For example, it may be 0.1*H or more (d ⁇ 0.1*H). If d is greater than H (d > H), a part of the separator, for example, the end, is included in the sealing part, so that when the electrolyte is injected into the pouch due to poor sealing, the electrolyte flows into the sealing part. It may flow in, or the electrolyte may flow out through the separator.
- the electrode assembly 10 is electrically connected to an electrode lead tab, and the electrode lead tab includes a positive lead tab 110 and a negative lead tab 210 .
- the positive electrode 100 has a positive lead tab 110 electrically connected to one end
- the negative electrode 200 has a negative lead tab 120 electrically connected to one end.
- the positive lead tab 110 and the negative lead tab 120 are electrically connected to the positive electrode 100 and the negative electrode 200 in the same direction.
- the electrode assembly 10 is stored inside the pouch 300, and the pouch 300 has a sealing portion 310 formed along the circumference of the pouch 300 and the positive electrode lead tab 110 through the sealing portion 310. and a joint portion 320 sealing a portion where the negative electrode lead tab 210 protrudes to the outside of the pouch 300 .
- the bonding portion 320 may seal the pouch 300 and at the same time serve as a buffer for the sealing portion 310 . If an excessively high pressure and/or temperature is applied to the joint 320, the joint 320 is damaged, and current is generated between the aluminum pouch and the electrode lead tab, thereby causing
- the junction part 320 may serve as a buffer for the sealing part 310 .
- damage occurs, and current is generated between the aluminum pouch 300 and the positive lead tab and/or the negative lead tab, thereby deteriorating the safety of the battery. there is.
- the joint portion 320 may be formed of a thermoplastic resin.
- the thermoplastic resin is not particularly limited as long as it can seal the pouch 300 and serve as a buffer for the sealing part 310 .
- the thermoplastic resin is polyvinyl chloride (PVC), polystyrene (PS), polycarbonate (PC), polymethyl methacrylate (PMMA), acrylonitrile butadiene styrene (ABS) polyurethane (PU), polyamide ( PA), polyacetal (POM), polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyimide (PI), liquid crystal polymer (LCP), polyether ether ketone (PEEK), polyether ketone ( PEK), ethylene propylene diene methylene rubber (EPDM), and acrylic rubber (ACM) may be at least one selected from the group consisting of.
- PVC polyvinyl chloride
- PS polystyrene
- PC polycarbonate
- PMMA polymethyl methacrylate
- ABS acrylonitrile butad
- the protruding portion of the separator may be formed with an insulating layer.
- the insulating layer may be partially formed at an end of a protruding portion of the separator.
- an insulating layer may be formed to a length of d/5, 4/d, or 3/d from one end of the edge of the protruding portion of the separator.
- the insulating layer may be formed on one side or both sides of the separator, and when the insulating layer is formed on one side of the separator, if it is formed on the side facing the negative electrode, the short circuit caused by the growth of lithium dendrites from the negative electrode is prevented can be effective in
- the insulating layer includes an insulating material, and the insulating material is not particularly limited as long as it is a material having insulating properties.
- the insulating material is not particularly limited as long as it is a material having insulating properties.
- any one of polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET) may be a derivative of any one of these, or a copolymer containing any one or more of these.
- the insulating material may further include polyvinylidene fluoride (PVDF) having high strength, processability, and excellent chemical resistance.
- PVDF polyvinylidene fluoride
- the insulating layer may have a structure in which an insulating material as described above is applied, or may have a structure in which an insulating tape is attached to a corresponding portion.
- the insulating tape may have a structure including any one of PE, PP, and PET, a derivative of any one of these, or a copolymer including any one or more of these.
- the separator may be formed so that only a portion overlapping the positive lead tab protrudes.
- FIG 4 is an exploded view of an electrode assembly included in a pouch-type lithium secondary battery according to another preferred embodiment of the present invention, in which one end of the separator 300 protrudes so as to overlap the cathode lead tab 110. It could be More specifically, one end of the separator 300 may protrude and wrap around the cathode lead tab 110 .
- the separator 300 protrudes to overlap the portion of the anode lead tab 210 or surrounds the anode lead tab 210 and reacts with the electrolyte to form lithium dendrites. may grow On the other hand, since there is no positive electrode active material in the positive lead tab 110, side reactions do not proceed if one end of the separator 300 protrudes to overlap with the positive lead tab 110 or wraps around the positive lead tab 110. and contact with lithium dendrites can be prevented.
- the lithium secondary battery as described above is intended to prevent lithium dendrites grown on the negative electrode from contacting the positive electrode, it may be effective when a lithium negative electrode is used as the negative electrode.
- the lithium secondary battery may be a lithium-sulfur secondary battery containing sulfur as a cathode active material.
- the positive electrode, separator, and electrolyte included in the lithium-sulfur secondary battery may be prepared according to conventional components and manufacturing methods, respectively, and the shape of the lithium-sulfur secondary battery is not particularly limited, but a cylindrical shape or a prismatic shape using a can , Pouch (Pouch) type or coin (Coin) type, etc. can be.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
Claims (10)
- 양극, 분리막 및 음극으로 이루어진 전극조립체;상기 전극조립체를 수납하는 파우치; 및상기 전극조립체와 전기적으로 연결된 전극 리드탭을 포함하는 이차전지로서,상기 전극 리드탭은, 양극 리드탭 및 음극 리드탭을 포함하고,상기 파우치는 가장자리의 실링부 및 상기 실링부를 통해 양극 리드탭 및 음극 리드탭이 파우치의 외부로 돌출되는 부분을 밀봉하는 접합부를 가지고,상기 분리막은 상기 양극의 일 말단에 비해 돌출된 형태이고, 상기 돌출된 부분의 길이는 상기 양극의 일 말단에서 상기 실링부까지의 길이 이하인 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 양극은 일 말단에 전기적으로 연결된 양극 리드탭을 가지고,상기 음극은 일 말단에 전기적으로 연결된 음극 리드탭을 가지고,상기 양극 리드탭과 음극 리드탭은 동일한 방향 또는 반대 방향으로 양극과 음극에 전기적으로 연결된 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 파우치는 알루미늄 파우치인 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 접합부는 열가소성 수지를 포함하는 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 분리막의 돌출된 부분의 일부분은 절연층을 가지는 것인, 파우치형 리튬 이차전지.
- 제5항에 있어서,상기 절연층은 분리막의 일 면 또는 양 면에 형성된 것인, 파우치형 리튬 이차전지.
- 제5항에 있어서,상기 절연층은 폴리에틸렌(PE), 폴리프로필렌(PP), 및 폴리에틸렌테레프탈레이트(PET)으로 이루어진 군에서 선택된 1종 이상을 포함하는 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 분리막의 일 말단은 상기 양극 리드탭과 중첩되도록 부분적으로 돌출되거나, 상기 양극 리드탭을 감싼 형태인 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 음극은 리튬 음극인 것인, 파우치형 리튬 이차전지.
- 제1항에 있어서,상기 리튬 이차전지는 리튬-황 이차전지인 것인, 파우치형 리튬 이차전지.
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EP22896088.6A EP4329042A1 (en) | 2021-11-22 | 2022-11-17 | Pouch-type lithium secondary battery |
JP2023577433A JP2024526094A (ja) | 2021-11-22 | 2022-11-17 | ポーチ型リチウム二次電池 |
CN202280036922.0A CN117397087A (zh) | 2021-11-22 | 2022-11-17 | 袋型锂二次电池 |
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- 2022-11-17 JP JP2023577433A patent/JP2024526094A/ja active Pending
- 2022-11-17 EP EP22896088.6A patent/EP4329042A1/en active Pending
- 2022-11-17 WO PCT/KR2022/018177 patent/WO2023090887A1/ko active Application Filing
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