WO2020179990A1 - 이차 전지용 파우치 및 파우치 형 이차 전지 - Google Patents
이차 전지용 파우치 및 파우치 형 이차 전지 Download PDFInfo
- Publication number
- WO2020179990A1 WO2020179990A1 PCT/KR2019/017512 KR2019017512W WO2020179990A1 WO 2020179990 A1 WO2020179990 A1 WO 2020179990A1 KR 2019017512 W KR2019017512 W KR 2019017512W WO 2020179990 A1 WO2020179990 A1 WO 2020179990A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- pouch
- secondary battery
- sealant
- gas barrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/302—Conductive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
- B32B2439/46—Bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
-
- 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
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/143—Fireproof; Explosion-proof
-
- 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
- H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
-
- 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 and a pouch-type secondary battery for secondary batteries, and more particularly, to a pouch and a pouch-type secondary battery for secondary batteries capable of preventing the occurrence of lithium plating even when an overvoltage occurs at a low temperature. It is about.
- types of secondary batteries include nickel cadmium batteries, nickel hydride batteries, lithium ion batteries, and lithium ion polymer batteries.
- These secondary batteries are not only small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also large-scale products requiring high output such as electric vehicles and hybrid vehicles, and surplus power generation. It is also applied and used in power storage devices for storing electric power or renewable energy and power storage devices for backup.
- a cathode, a separator, and an anode are manufactured, and these are stacked. Specifically, a positive electrode active material slurry is applied to a positive electrode current collector, and a negative electrode active material slurry is applied to a negative electrode current collector to prepare a cathode and a negative electrode.
- a separator is interposed between the prepared anode and the cathode to be stacked, unit cells are formed, and the unit cells are stacked on top of each other to form an electrode assembly.
- a secondary battery is manufactured.
- the problem to be solved by the present invention is to provide a pouch for a secondary battery and a pouch-type secondary battery capable of preventing the occurrence of lithium plating even if an overvoltage occurs at a low temperature.
- a pouch for a secondary battery according to an embodiment of the present invention for solving the above problems is made of a first polymer, and a surface protective layer formed on the outermost layer; A sealant layer made of a second polymer and formed on the innermost layer; A gas barrier layer made of metal and laminated between the surface protection layer and the sealant layer; And a heat dissipating layer made of ceramic, laminated between the surface protection layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
- the ceramic may be lambda trititanium pentoxide.
- the ceramic may be converted to beta trititanium pentoxide when a pressure greater than 60 MPa is applied.
- gas barrier layer may be formed in plural.
- the heat dissipating layer may be stacked between the plurality of gas barrier layers.
- the heat dissipating layer may be stacked inside the gas barrier layer.
- the surface protective layer may be formed in plural.
- the plurality of surface protective layers made of PET, the first surface protective layer formed on the outermost layer; And a second surface protective layer made of nylon and laminated on the inner side of the first surface protective layer.
- sealant layer may be formed in plural.
- the plurality of sealant layers may include a first sealant layer made of PPa and formed on the innermost layer; And a second sealant layer made of CPP and laminated on the outside of the first sealant layer.
- a pouch-type secondary battery for solving the above problem includes an electrode assembly formed by alternately stacking electrodes and separators; And a pouch-type battery case accommodating the electrode assembly, wherein the battery case comprises: a surface protective layer made of a first polymer and formed on an outermost layer; A sealant layer made of a second polymer and formed on the innermost layer; A gas barrier layer made of metal and laminated between the surface protection layer and the sealant layer; And a heat dissipating layer made of ceramic, laminated between the surface protection layer and the sealant layer, and emitting heat to the outside when a specific pressure is applied.
- the ceramic may be lambda trititanium pentoxide.
- gas barrier layer may be formed in plural.
- the heat dissipating layer may be stacked between the plurality of gas barrier layers.
- a heat dissipating layer made of ceramic containing lambda trititanium pentoxide is included in the pouch for a secondary battery, and when pressure is applied, heat is released to the outside, so even if an overvoltage occurs at a low temperature The occurrence of lithium plating can be prevented by increasing.
- FIG. 1 is an assembly diagram of a pouch-type secondary battery according to an embodiment of the present invention.
- FIG. 2 is an enlarged cross-sectional view of a pouch-type secondary battery according to an embodiment of the present invention.
- FIG 3 is an enlarged cross-sectional view showing an increase in thickness of a pouch-type secondary battery according to an exemplary embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a pouch film according to an embodiment of the present invention.
- FIG. 5 is a conceptual diagram of Lambda Trititanium Pentoxide and Beta Trititanium Pentoxide.
- FIG. 6 is a cross-sectional view of a pouch film according to another embodiment of the present invention.
- FIG. 7 is a cross-sectional view showing a state in which a surface protective layer and a sealant layer of a pouch film according to another embodiment of the present invention have a composite film structure.
- FIG. 1 is an assembly diagram of a pouch-type secondary battery 1 according to an embodiment of the present invention.
- a pouch-type secondary battery 1 includes a pouch-type battery case 13 and an electrode assembly 10 accommodated in the battery case 13, as shown in FIG. 1. Includes.
- the electrode assembly 10 may be a stacked structure having two electrodes, such as an anode and a cathode, and a separator interposed between the electrodes to insulate the electrodes from each other, or disposed on the left or right of any one electrode.
- the laminated structure may have various shapes without limitation, such as a positive electrode and a negative electrode of a predetermined standard may be laminated with a separator interposed therebetween, or may be wound in a jelly roll form.
- the two electrodes have a structure in which an active material slurry is applied to an electrode current collector in the form of a metal foil or metal mesh including aluminum and copper, respectively.
- the slurry may be formed by stirring a particulate active material, an auxiliary conductor, a binder, a plasticizer, and the like in a state in which a solvent is added. The solvent is removed in a subsequent process.
- the electrode assembly 10 includes an electrode tab 11, as shown in FIG. 1.
- the electrode tabs 11 are respectively connected to the anode and the cathode of the electrode assembly 10, protrude to the outside of the electrode assembly 10, and become a path through which electrons can move between the inside and the outside of the electrode assembly 10. .
- the current collector of the electrode assembly 10 includes a portion coated with an electrode active material and a terminal portion to which the electrode active material is not applied, that is, a non-coated portion.
- the electrode tab 11 may be formed by cutting the uncoated portion or by connecting a separate conductive member to the uncoated portion by ultrasonic welding or the like. As shown in FIG. 1, the electrode tabs 11 may protrude from one side of the electrode assembly 10 in the same direction, but are not limited thereto and may protrude in different directions.
- An electrode lead 12 is connected to the electrode tab 11 of the electrode assembly 10 by spot welding or the like.
- a part of the electrode lead 12 is surrounded by an insulating portion 14.
- the insulating portion 14 is located limited to a sealing portion in which the upper pouch 131 and the lower pouch 132 of the battery case 13 are thermally fused, and is adhered to the battery case 13.
- electricity generated from the electrode assembly 10 is prevented from flowing to the battery case 13 through the electrode lead 12 and the sealing of the battery case 13 is maintained. Accordingly, the insulating portion 14 is made of a non-conductive non-conductor that does not conduct electricity well.
- an insulating tape that is easy to attach to the electrode lead 12 and has a relatively thin thickness is often used, but it is not limited thereto, and various members can be used as long as the electrode lead 12 can be insulated. have.
- the electrode leads 12 may extend in the same direction or in opposite directions according to the formation positions of the positive electrode tab 111 and the negative electrode tab 112.
- the anode lead 121 and the cathode lead 122 may have different materials from each other. That is, the positive lead 121 may be made of the same aluminum (Al) material as the positive plate, and the negative lead 122 may be made of the same copper (Cu) material as the negative plate or a copper material coated with nickel (Ni).
- a portion of the electrode lead 12 protruding to the outside of the battery case 13 becomes a terminal portion and is electrically connected to the external terminal.
- the battery case 13 is a pouch made of a flexible material.
- the battery case 13 accommodates and seals the electrode assembly 10 so that a part of the electrode lead 12, that is, the terminal portion is exposed.
- the battery case 13 includes an upper pouch 131 and a lower pouch 132 as shown in FIG. 1.
- a cup portion 133 is formed in the lower pouch 132 to provide an accommodation space 1331 capable of accommodating the electrode assembly 10, and in the upper pouch 131, the electrode assembly 10 is a battery case 13
- the accommodation space 1331 is covered from the top so as not to be separated from the outside of the unit.
- the cup portion 133 is shown to be formed only on the lower pouch 132, but is not limited thereto and may be formed in various ways, such as may be formed on the upper pouch 131.
- One side of the upper pouch 131 and the lower pouch 132 may be manufactured by being connected to each other as shown in FIG. 1, but is not limited thereto and may be manufactured in various ways such as being separated from each other and manufactured separately.
- the cup portion 133 of the lower pouch 132 When the electrode lead 12 is connected to the electrode tab 11 of the electrode assembly 10 and the insulating portion 14 is formed on a part of the electrode lead 12, the cup portion 133 of the lower pouch 132 The electrode assembly 10 is accommodated in the accommodation space 1331, and the upper pouch 131 covers the space from the top. Then, an electrolyte is injected into the inside, and sealing portions formed on the edges of the upper pouch 131 and the lower pouch 132 are sealed.
- the electrolyte is for moving lithium ions generated by the electrochemical reaction of the electrode during charging and discharging of the secondary battery 1, and is a non-aqueous organic electrolyte or a polymer using a polymer electrolyte, which is a mixture of a lithium salt and a high-purity organic solvent. It may include. Through this method, a pouch-type secondary battery 1 may be manufactured.
- FIG. 2 is an enlarged cross-sectional view of a pouch-type secondary battery 1 according to an embodiment of the present invention
- FIG. 3 is a view showing an increase in thickness of the pouch-type secondary battery 1 according to an embodiment of the present invention. It is a cross-sectional enlarged view.
- lithium plating As described above, when an overvoltage occurs at a low temperature, the charging current density increases, and accordingly, lithium ions of the positive electrode are not sufficiently quickly received in the negative electrode active material coating layer. As a result, lithium ions accumulate on the surface of the negative electrode and precipitate as metallic lithium. This is called lithium plating.
- the thickness of the electrode assembly 10 increases as shown in FIG. 3. Accordingly, the thickness of the entire pouch-type secondary battery 1 is increased, thereby reducing the assembly quality of the secondary battery 1 and reducing energy efficiency relative to the volume.
- FIG. 4 is a cross-sectional view of a pouch film 134 according to an embodiment of the present invention.
- a heat dissipating layer 1344 made of ceramic including lambda trititanium pentoxide is included in a pouch for a secondary battery, and when pressure is applied, heat is released to the outside. , Even if an overvoltage occurs at low temperature, the occurrence of lithium plating can be prevented by increasing the temperature.
- the pouch for a secondary battery is made of a first polymer and includes a surface protective layer 1342 formed on the outermost layer; A sealant layer 1343 made of a second polymer and formed on the innermost layer; A gas barrier layer (1341) made of metal and laminated between the surface protection layer (1342) and the sealant layer (1343); And a heat dissipating layer 1344 made of ceramic, laminated between the surface protection layer 1342 and the sealant layer 1343, and emit heat to the outside when a specific pressure is applied.
- the ceramic is Lambda Trititanium Pentoxide, and when a pressure greater than 60 MPa is applied, it can be converted into Beta Trititanium Pentoxide.
- the pouch which is the battery case 13 of the pouch-type secondary battery 1 according to an exemplary embodiment of the present invention, is manufactured by drawing the pouch film 134. That is, it is manufactured by stretching the pouch film 134 with a punch or the like to form the cup portion 133.
- a pouch film 134 is a gas barrier layer (Gas Barrier Layer, 1341), a surface protection layer (Surface Protection Layer, 1342) and a sealant layer (Sealant layer), as shown in FIG. Layer, 1343).
- the gas barrier layer 1341 secures the mechanical strength of the pouch, blocks entry of gas or moisture from the outside of the secondary battery 1, and prevents leakage of an electrolyte.
- the gas barrier layer 1341 is made of a metal, and the metal may include aluminum.
- aluminum can secure a mechanical strength of a predetermined level or higher, it is light in weight, and complements the electrochemical properties of the electrode assembly 10 and the electrolyte, and can secure heat dissipation.
- the present invention is not limited thereto, and various materials may be included in the gas barrier layer 1341.
- it may be one or a mixture of two or more selected from the group consisting of iron (Fe), chromium (Cr), manganese (Mn), nickel (Ni), and aluminum (Al).
- Fe iron
- Cr chromium
- Mn manganese
- Ni nickel
- Al aluminum
- the gas barrier layer 1341 is made of a material containing iron, mechanical strength is improved, and when a material containing aluminum is made of a material, flexibility is improved, and thus it may be used in consideration of each characteristic.
- the gas barrier layer 1341 may have a thickness of 30 to 80 ⁇ m if made of aluminum. If it is thinner than 30 ⁇ m, there is a problem that the quality of the battery is deteriorated because it becomes excessively thin, resulting in deterioration of formability and the number of pinholes. On the contrary, if it is thicker than 80 ⁇ m, the entire pouch becomes thicker, so the volume of the secondary battery increases and the energy density may decrease. More preferably, the gas barrier layer 1341 may have a thickness of 30 to 50 ⁇ m.
- the surface protection layer 1342 is made of a first polymer and is positioned on the outermost layer to protect the secondary battery 1 from friction and collision with the outside, while electrically insulating the electrode assembly 10 from the outside.
- the outermost layer refers to a layer located last when facing the gas barrier layer 1341 in a direction opposite to the direction in which the electrode assembly 10 is located.
- the first polymer for preparing the surface protective layer 1342 is polyethylene, polypropylene, polycarbonate, polyethylene terephthalate (PET), polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, It may be made of one or more materials selected from the group consisting of aramid, nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fibers. In particular, polymers such as nylon resin or polyethylene terephthalate (PET), which have abrasion resistance and heat resistance, are mainly used.
- the surface protective layer 1342 may have a thickness of 12 to 25 ⁇ m if made of PET. If it is thinner than 12 ⁇ m, there is a problem that the external insulating property is deteriorated and the adhesiveness to the gas barrier layer 1341 is deteriorated. Conversely, if it is thicker than 25 ⁇ m, the entire pouch becomes thicker, so the volume of the secondary battery increases and the energy density may decrease. More preferably, the surface protection layer 1342 may have a thickness of 20 to 25 ⁇ m.
- the surface protection layer 1342 may have a single layer structure made of any one material, but may be formed in plural. That is, two or more materials may have a composite film structure formed by forming a layer.
- the plurality of surface protection layers 1342 are made of polyethylene terephthalate (PET), a first surface protection layer formed on the outermost layer, and nylon, and laminated on the inner side of the first surface protection layer. It may include a second surface protection layer.
- the sealant layer 1343 is made of a second polymer, and is positioned on the innermost layer to directly contact the electrode assembly 10.
- the innermost layer refers to a layer located last when the gas barrier layer 1341 is directed in a direction in which the electrode assembly 10 is positioned.
- the pouch is manufactured by drawing the pouch film 134 of the laminated structure as described above using a punch, etc. to form a cup portion 133 including the pouch-shaped receiving space 1331 by being partially stretched. do.
- an electrolyte is injected.
- the sealant layers 1343 are adhered to each other, thereby sealing the pouch.
- the sealant layer 1343 since the sealant layer 1343 directly contacts the electrode assembly 10, it must have insulating properties, and since it also contacts the electrolyte, it must have corrosion resistance.
- the inside since the inside must be completely sealed to block material movement between the inside and outside, it must have high sealing properties. That is, the sealing portions to which the sealant layers 1343 are bonded to each other should have excellent thermal bonding strength.
- the second polymer for producing the sealant layer 1343 is polyethylene, polypropylene, polycarbonate, polyethylene terephthalate, polyvinyl chloride, acrylic polymer, polyacrylonitrile, polyimide, polyamide, cellulose, aramid, It may be made of one or more materials selected from the group consisting of nylon, polyester, polyparaphenylenebenzobisoxazole, polyarylate, Teflon, and glass fibers.
- polyolefin resins such as polypropylene (PP) or polyethylene (PE) are mainly used.
- Polypropylene (PP) is excellent in mechanical properties such as tensile strength, stiffness, surface hardness, abrasion resistance, heat resistance, and chemical properties such as corrosion resistance, and is mainly used to manufacture the sealant layer 1343. Furthermore, it may be composed of non-stretched polypropylene (Cated Polypropylene) or acid-treated polypropylene (Acid Modified Polypropylene) or polypropylene-butylene-ethylene terpolymer.
- the acid-treated polypropylene may be MAH PP (maleic anhydride polypropylene).
- the sealant layer 1343 may have a thickness of 30 to 100 ⁇ m if made of polypropylene (PP). If it is thinner than 30 ⁇ m, there is a problem that the sealing durability is deteriorated, such as destruction of the interior during sealing. Conversely, if it is thicker than 100 ⁇ m, the entire pouch becomes thicker, so the volume of the secondary battery increases and the energy density may decrease. More preferably, the sealant layer 1343 may have a thickness of 50 to 80 ⁇ m.
- the sealant layer 1343 may have a single layer structure made of any one material, but may be formed in plural. That is, two or more materials may have a composite film structure formed by forming a layer.
- the plurality of sealant layers 1343 are made of acid-treated polypropylene (Acid Modified Polypropylene, PPa) and made of a first sealant layer and non-stretched polypropylene (Cated Polypropylene, CPP) formed on the innermost layer, It may include a second sealant layer laminated on the outside of the first sealant layer.
- the pouch film 134 is made of ceramic, is laminated between the surface protection layer 1342 and the sealant layer 1343, and releases heat to the outside when a specific pressure is applied. It further includes an emissive layer 1344.
- the heat dissipating layer 1344 is made of ceramic, and the ceramic absorbs heat and is converted into another material when a specific pressure is applied, thereby discharging the absorbed heat to the outside.
- the ceramic may be lambda trititanium pentoxide ( ⁇ -Ti 3 O 5 ).
- the heat dissipating layer 1344 may be stacked inside the gas barrier layer 1341.
- FIG. 5 is a conceptual diagram of Lambda Trititanium Pentoxide and Beta Trititanium Pentoxide.
- Lambda trititanium pentoxide ( ⁇ -Ti 3 O 5 ) is composed of only titanium atoms (Ti) and oxygen atoms (O), as shown in FIG. 5, and can absorb approximately 230 kJ/L of heat. .
- ⁇ -Ti 3 O 5 In the state where lambda trititanium pentoxide absorbs heat and stores it, when a pressure greater than about 60 MPa is applied, it is converted into beta-trititanium pentoxide ( ⁇ -Ti 3 O 5 ).
- the lambda trititanium pentoxide and the beta trititanium pentoxide differ only in the physical bonding structure of their atoms, and the constituent materials are not chemically different.
- the stored heat of about 230 kJ/L is released to the outside. This increases the ambient temperature.
- the thickness of the entire pouch-type secondary battery increases, thereby reducing the assembly quality of the secondary battery and reducing energy efficiency relative to the volume.
- a heat dissipating layer 1344 made of ceramic containing lambda trititanium pentoxide is included in the pouch for a secondary battery, and when pressure is applied, heat is released to the outside. By doing so, even if an overvoltage occurs at a low temperature, the temperature can be increased to prevent the occurrence of lithium plating.
- the beta-trititanium pentoxide that has released heat is converted into lambda-trititanium pentoxide by absorbing the surrounding heat again. Accordingly, the heat dissipating layer 1344 may continuously repeat the above process.
- FIG. 6 is a cross-sectional view of a pouch film 134a according to another embodiment of the present invention.
- the gas barrier layer 1341 has a single layer structure, and the heat release layer 1344 is stacked on the inner side of the gas barrier layer 1341.
- a plurality of gas barrier layers 1341a and 1341b may be formed. That is, two or more materials may have a composite film structure formed by forming a layer. Even in this case, all of the gas barrier layers 1341a and 1341b may be made of the same type of metal. That is, it may be made of one or a mixture of two or more selected from the group consisting of iron (Fe), chromium (Cr), manganese (Mn), nickel (Ni), and aluminum (Al).
- the heat release layer 1344 may be stacked between the plurality of gas barrier layers 1341a and 1341b, as shown in FIG. 6.
- both surfaces of the heat dissipating layer 1344 are stacked in direct contact with the gas barrier layers 1341a and 1341b. Accordingly, when the thickness of the electrode assembly 10 increases, pressure can be more effectively applied to the heat dissipating layer 1344 by the gas barrier layers 1341a and 1341b made of metal.
- FIG. 7 is a cross-sectional view showing a state in which the surface protection layer 1342 and the sealant layer 1343 of the pouch film 134a according to another embodiment of the present invention have a composite film structure.
- the surface protection layer 1342 may have a single layer structure made of any one material, but may be formed in plural. That is, two or more materials may have a composite film structure formed by forming a layer.
- the plurality of surface protection layers 1342 are made of polyethylene terephthalate (PET) and are made of a first surface protection layer 1342a and nylon formed on the outermost layer, and the first surface protection layer It may include a second surface protection layer 1342b stacked on the inside.
- PET polyethylene terephthalate
- the sealant layer 1343 may have a single layer structure made of any one material, but may be formed in plural. That is, two or more materials may have a composite film structure formed by forming a layer.
- the plurality of sealant layers 1343 are made of acid-treated polypropylene (PPa), and are made of a first sealant layer 1343a and non-stretched polypropylene (CPP) formed on the innermost layer. It may include a second sealant layer (1343b) that is manufactured and laminated on the outside of the first sealant layer.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Laminated Bodies (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims (14)
- 제1 폴리머로 제조되고, 최외층에 형성되는 표면 보호층;제2 폴리머로 제조되고, 최내층에 형성되는 실란트층;금속으로 제조되고, 상기 표면 보호층 및 상기 실란트층의 사이에 적층되는 가스 배리어층; 및세라믹으로 제조되고, 상기 표면 보호층 및 상기 실란트층의 사이에 적층되며, 특정 압력을 인가받으면 외부로 열을 방출하는 열방출층을 포함하는 이차 전지용 파우치.
- 제1항에 있어서,상기 세라믹은,람다트리티타늄오산화물(lambda trititanium pentoxide)인, 이차 전지용 파우치.
- 제2항에 있어서,상기 세라믹은,60 MPa 보다 큰 압력을 인가받으면, 베타트리티타늄오산화물(beta trititanium pentoxide)으로 변환되는, 이차 전지용 파우치.
- 제1항에 있어서,상기 가스 배리어층은,복수로 형성되는, 이차 전지용 파우치.
- 제4항에 있어서,상기 열방출층은,복수의 상기 가스 배리어층의 사이에 적층되는, 이차 전지용 파우치.
- 제1항에 있어서,상기 열방출층은,상기 가스 배리어층보다 내측에 적층되는, 이차 전지용 파우치.
- 제1항에 있어서,상기 표면 보호층은,복수로 형성되는, 이차 전지용 파우치.
- 제7항에 있어서,복수의 상기 표면 보호층은,PET로 제조되고, 최외층에 형성되는 제1 표면 보호층; 및나일론으로 제조되고, 상기 제1 표면 보호층의 내측에 적층되는, 제2 표면 보호층을 포함하는, 이차 전지용 파우치.
- 제1항에 있어서,상기 실란트층은,복수로 형성되는, 이차 전지용 파우치.
- 제9항에 있어서,복수의 상기 실란트층은,PPa로 제조되고, 최내층에 형성되는 제1 실란트층; 및CPP로 제조되고, 상기 제1 실란트층의 외측에 적층되는, 제2 실란트층을 포함하는, 이차 전지용 파우치.
- 전극 및 분리막이 교대로 적층하여 형성되는 전극 조립체; 및상기 전극 조립체를 수납하는 파우치 형 전지 케이스를 포함하되,상기 전지 케이스는,제1 폴리머로 제조되고, 최외층에 형성되는 표면 보호층;제2 폴리머로 제조되고, 최내층에 형성되는 실란트층;금속으로 제조되고, 상기 표면 보호층 및 상기 실란트층의 사이에 적층되는 가스 배리어층; 및세라믹으로 제조되고, 상기 표면 보호층 및 상기 실란트층의 사이에 적층되며, 특정 압력을 인가받으면 외부로 열을 방출하는 열방출층을 포함하는 파우치 형 이차 전지.
- 제11항에 있어서,상기 세라믹은,람다트리티타늄오산화물(lambda trititanium pentoxide)인, 파우치 형 이차 전지.
- 제11항에 있어서,상기 가스 배리어층은,복수로 형성되는, 파우치 형 이차 전지.
- 제13항에 있어서,상기 열방출층은,복수의 상기 가스 배리어층의 사이에 적층되는, 파우치 형 이차 전지.
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| JP2020547169A JP2021517710A (ja) | 2019-03-04 | 2019-12-11 | 二次電池用パウチ及びパウチ型二次電池 |
| EP19917693.4A EP3758133B1 (en) | 2019-03-04 | 2019-12-11 | Pouch for secondary battery and pouch type secondary battery |
| PL19917693.4T PL3758133T3 (pl) | 2019-03-04 | 2019-12-11 | Saszetka na baterię akumulatorową i bateria akumulatorowa typu saszetkowego |
| US17/043,990 US12206119B2 (en) | 2019-03-04 | 2019-12-11 | Pouch for secondary battery and pouch type secondary battery |
| ES19917693T ES2960720T3 (es) | 2019-03-04 | 2019-12-11 | Funda para batería secundaria y batería secundaria de tipo funda |
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| KR1020190024846A KR102417198B1 (ko) | 2019-03-04 | 2019-03-04 | 이차 전지용 파우치 및 파우치 형 이차 전지 |
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| EP (1) | EP3758133B1 (ko) |
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| KR (1) | KR102417198B1 (ko) |
| CN (2) | CN211789103U (ko) |
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| KR102537683B1 (ko) * | 2022-10-27 | 2023-05-30 | 율촌화학 주식회사 | 복수개의 금속층을 갖는 셀 타입 전지 파우치용 적층 구조체 및 이를 이용한 이차전지 |
| KR102662512B1 (ko) * | 2022-12-30 | 2024-05-03 | 율촌화학 주식회사 | 상온 및 고온 실링강도 특성이 우수한 이차전지용 파우치 필름, 이를 이용한 이차전지 및 그 제조 방법 |
| CN118448770B (zh) * | 2024-05-31 | 2025-11-18 | 广东嘉尚新能源科技有限公司 | 一种锂离子电池组散热保护结构 |
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| Publication number | Publication date |
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| HUE063471T2 (hu) | 2024-01-28 |
| KR20200106588A (ko) | 2020-09-15 |
| CN211789103U (zh) | 2020-10-27 |
| US12206119B2 (en) | 2025-01-21 |
| CN111653691B (zh) | 2023-08-22 |
| JP2021517710A (ja) | 2021-07-26 |
| ES2960720T3 (es) | 2024-03-06 |
| US20210036271A1 (en) | 2021-02-04 |
| CN111653691A (zh) | 2020-09-11 |
| EP3758133A4 (en) | 2021-06-02 |
| KR102417198B1 (ko) | 2022-07-06 |
| EP3758133A1 (en) | 2020-12-30 |
| EP3758133B1 (en) | 2023-10-11 |
| PL3758133T3 (pl) | 2024-02-05 |
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