WO2023214644A1 - 가스 배출 부재 및 이를 구비한 이차전지 - Google Patents
가스 배출 부재 및 이를 구비한 이차전지 Download PDFInfo
- Publication number
- WO2023214644A1 WO2023214644A1 PCT/KR2023/001862 KR2023001862W WO2023214644A1 WO 2023214644 A1 WO2023214644 A1 WO 2023214644A1 KR 2023001862 W KR2023001862 W KR 2023001862W WO 2023214644 A1 WO2023214644 A1 WO 2023214644A1
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- Prior art keywords
- gas
- gas discharge
- discharge member
- sheet
- hole
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—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
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
-
- 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
- H01M50/183—Sealing members
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
- H01M50/358—External gas exhaust passages located on the battery cover or case
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/375—Vent means sensitive to or responsive to temperature
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
-
- 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 gas exhaust member and a secondary battery having the same.
- secondary batteries are receiving much attention as an energy source for not only mobile devices such as mobile phones, digital cameras, laptops, and wearable devices, but also power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles.
- these secondary batteries are classified into cylindrical batteries and prismatic batteries in which the electrode assembly is built into a cylindrical or square metal can, and pouch-type batteries in which the electrode assembly is built in a pouch-shaped case of aluminum laminate sheet.
- the electrode assembly built into the battery case is a power generating element capable of charging and discharging consisting of a positive electrode, a negative electrode, and a separator structure sandwiched between the positive electrode and the negative electrode, and a separator is formed between the positive electrode and the negative electrode in the form of a long sheet coated with an active material. It is classified into a jelly-roll type in which a plurality of anodes and cathodes are interposed and wound, and a stack type in which multiple anodes and cathodes are sequentially stacked with a separator interposed between them.
- pouch-type batteries which have a stacked or stacked/folded electrode assembly built into a pouch-type battery case of aluminum laminated sheets, is gradually increasing due to low manufacturing costs, small weight, and easy deformation. It is increasing.
- an opening is formed in a part of the battery case that penetrates the case in the thickness direction, and a gas discharge member made of a gas-permeable sheet covering the entire opening is adhered to the inside of the opening, thereby forming an opening that penetrates the case in the thickness direction.
- a secondary battery has been proposed in which the generated gas passes through a gas-permeable gas discharge member and is discharged through an opening. If the gas generated inside the battery cell is smoothly discharged through the gas-permeable gas discharge member, venting does not occur and the cell can continue to operate.
- the gas exhaust member is not firmly attached to the battery case, the gas exhaust ability is reduced and moisture outside the battery cell penetrates into the battery cell, so there is a need to improve the binding force of the gas exhaust member to the battery case.
- the problem to be solved by the present invention is to provide a gas discharge member with improved binding force to a battery case and a secondary battery including the same.
- gas exhaust members of the following embodiments are provided.
- the first embodiment is,
- It relates to a sheet having gas permeability, and a gas discharge member provided with a hole in a peripheral portion of the sheet.
- the second embodiment is, in the first embodiment,
- the peripheral portion may be an area corresponding to the length from the end of the sheet to 2/5 of the total length of the sheet.
- the third embodiment is, in the first or second embodiment,
- the width of the peripheral portion may be 2 mm or more from the end of the sheet.
- the fourth embodiment is, in the third embodiment,
- the width of the peripheral portion may be 15 mm or less from the end of the sheet.
- the fifth embodiment is, in any one of the first to fourth embodiments,
- the sheet is rectangular, and the holes may be located in both horizontal areas or both vertical areas of the periphery.
- the sixth embodiment is, in any one of the first to fifth embodiments,
- the sheet is rectangular, and the holes can be located in both horizontal and both vertical areas of the periphery.
- the seventh embodiment is, in the sixth embodiment,
- Two or more holes may be located in each of the two horizontal areas and two or more holes may be located in each of the two vertical areas.
- the eighth embodiment is, in the seventh embodiment,
- the hole may have a circular or oval cross-section.
- the ninth embodiment is, in the eighth embodiment,
- the hole may have a diameter of 10 ⁇ m to 500 ⁇ m.
- the tenth embodiment is, in any one of the first to sixth embodiments,
- the hole may be rectangular, and at least one hole may be located in each of the two horizontal areas and one or more holes may be located in each of the two vertical areas.
- the eleventh embodiment is, in any one of the first to tenth embodiments,
- the hole may penetrate the gas exhaust member in the thickness direction of the gas exhaust member.
- the twelfth embodiment is, in any one of the first to eleventh embodiments,
- the total area of the hole may be 5% to 50% of the total area of the gas discharge member.
- the thirteenth embodiment is, in any one of the first to twelfth embodiments,
- the gas permeability of the gas discharge member may be 40 to 150 barrer at 60°C.
- the fourteenth embodiment is, in any one of the first to thirteenth embodiments,
- the moisture penetration amount of the gas discharge member may be 10 mg to 100 mg for 10 years at 25°C and 50%RH.
- the fifteenth embodiment is, in any one of the first to fourteenth embodiments,
- the gas-permeable sheet may include a fluorine-based resin.
- the sixteenth embodiment is, in any one of the first to fifteenth embodiments,
- the thickness of the gas discharge member may be 50 to 500 ⁇ m.
- the 17th embodiment is,
- the case has an inner resin layer containing a gas barrier layer and a sealant resin
- An opening is formed in a portion of the case to penetrate the case in the thickness direction
- a gas discharge member according to any one of the first to sixteenth embodiments is provided on the inside of the opening so as to cover the entire opening,
- the hole provided in the gas discharge member is located in a portion that overlaps the inner resin layer of the case,
- It relates to a secondary battery, wherein the sealant resin of the inner resin layer is introduced into the hole provided in the gas discharge member.
- the case may include a laminate sheet in which an outer resin layer, a gas barrier layer made of a metal layer, and an inner resin layer including a sealant resin are sequentially stacked on the gas barrier layer.
- the 19th embodiment is the 17th or 18th embodiment
- the gas discharge member is made of a gas-permeable sheet containing a fluorine-based resin, and the glass transition temperature of the fluorine-based resin may be greater than the glass transition temperature of the sealant resin.
- the twentieth embodiment is, in any one of the seventeenth to eighteenth embodiments,
- the sealant resin may include polypropylene, polyethylene, polyvinyldifluoride (PVDF), or two or more thereof.
- a gas discharge member according to an embodiment of the present invention is a gas-permeable sheet, and has a hole in the periphery of the sheet.
- the gas discharge member which is located in the area where the hole provided in the peripheral part overlaps the inner resin layer of the battery case, causes the sealant resin contained in the inner resin layer of the case to flow and enter the hole when heat bonded to the case, thereby creating a gap between the case and the case.
- the binding power is improved. Accordingly, the effect of the gas generated inside the battery cell being discharged through the gas discharge member is improved, and moisture penetration into the battery cell can be reduced.
- Figure 1 is a perspective view showing a gas discharge member according to an embodiment of the present invention.
- Figure 2 is a perspective view showing a gas discharge member according to another embodiment of the present invention.
- Figure 3 is a perspective view showing a gas discharge member according to another embodiment of the present invention.
- Figure 4 is a diagram showing a cross section taken along the A-A' axis of Figure 1.
- Figure 5 is a top view of a secondary battery according to an embodiment of the present invention.
- Figure 6 is a cross-sectional view taken along the B-B' axis in Figure 4.
- a gas exhaust member according to one aspect of the present invention has a hole.
- the gas discharge member according to one aspect of the present invention is a gas-permeable sheet, and has a hole in the periphery of the sheet.
- sheet having gas permeability refers to a member that has a thin thickness-to-area shape, such as a commonly used film or sheet, and whose material itself has the property of permeating gas.
- fluorine resin which is represented as a material for gas discharge members, has excellent gas permeability (gas discharge performance) and is a useful material for preventing moisture infiltration from the outside, but does not have a strong binding force to the battery case.
- the present inventors provide a gas discharge member that can improve binding force to the battery case.
- Figure 1 is a perspective view showing a gas discharge member according to an embodiment of the present invention.
- a hole 100 is formed in the gas discharge member 1.
- the sealant resin contained in the inner resin layer of the case flows inside the hole 100 and a portion is drawn into the hole, thereby forming a bond between the gas discharge member 1 and the case.
- the binding force can be improved.
- the gas discharge member 1 is a sheet-like member having gas permeability.
- the shape of the gas discharge member 1 may be rectangular as shown, but may be variously modified as needed, such as circular or oval.
- the hole 100 is provided in the peripheral portion 1b of the gas discharge member 1.
- the “peripheral portion” of the sheet refers to the portion that overlaps the inner resin layer of the case when heat bonding the gas exhaust member 1 to the inside of the opening of the battery case to cover the entire opening. That is, the hole 100 is not located to overlap the opening of the case, but is located in the “periphery” of the gas discharge member 1, which is the portion that overlaps the inner resin layer of the case.
- the central portion 1a of the gas discharge member 1 is defined as a portion excluding the “peripheral portion” and overlaps the opening of the case.
- the peripheral portion 1b may be an area corresponding to the length from the end of the sheet constituting the gas discharge member 1 to 2/5 of the total length of the sheet.
- the peripheral portion 1b is an area corresponding to the length from the end of the sheet to 2/5 of the total horizontal length (Y) 0.4Y) and an area (0.4W) corresponding to the length from the end of the sheet to 2/5 of the total vertical length (W).
- the gas discharge member 1 can be easily positioned so that the hole 100 does not overlap the opening of the case but overlaps the inner resin layer of the case.
- the peripheral portion 1b corresponds to the length from the end of the sheet constituting the gas exhaust member 1 to 2/5 of the sheet diameter. This may be an area where
- the width of the peripheral portion is preferably 2 mm or more from the end of the sheet for the stability of adhesion of the gas exhaust member 1 to the battery case. More specifically, the width (0.4Y, 0.4W) of the peripheral portion may be 2 to 15 mm from the end of the sheet.
- the gas discharge member 1 may have holes 100 formed at both ends. That is, when the sheet constituting the gas discharge member 1 is rectangular, the holes 100 may be located in both horizontal areas of the periphery (see FIG. 2) or may be located in both vertical areas. When the hole 100 is formed in this way, the gas discharge member 1 can be easily attached to the battery case and the gas inside the battery can be easily discharged to the outside. More specifically, as shown in FIG. 1, when the sheet constituting the gas discharge member 1 is rectangular, the hole 100 may be located in both horizontal areas and both vertical areas of the peripheral portion 1b.
- hole means a space dug in the thickness direction (for example, 1/4 or more of the thickness) to achieve the purpose of the present invention even if it penetrates the gas discharge member 1 in the thickness direction or not.
- the shape of the hole 100 may have a circular, oval, triangular, wavy, or rectangular cross-section. The shape is not limited, but when considering fairness, etc., it may have a circular or oval cross-section.
- two or more holes 100 may be located in each of both horizontal areas and two or more holes may be located in each of both vertical areas.
- the cross section of the hole 100 may be circular or oval, and the diameter of the hole 100 may be 10 ⁇ m to 500 ⁇ m, but is not limited thereto. As the diameter of the hole 100 satisfies the above-mentioned range, the adhesion characteristics between the gas discharge member 1 and the battery case can be more easily improved.
- the holes 100 are rectangular, and are located at least one in each of both horizontal areas and at least one in each of both vertical areas. It can be done, but it is not limited to this.
- the hole 100 may be formed, for example, physically or chemically.
- a hole 100 may be formed in the gas discharge member 1 using a drill or a laser.
- the hole 100 may be formed in the gas discharge member 1 by wet etching or pattern printing the fluorine-based resin.
- the total area of the hole 100 may be 5% to 50% of the total area of the gas discharge member 1. As the total area of the hole 100 satisfies the above-mentioned range, the adhesion characteristics between the gas discharge member 1 and the case can be more easily improved.
- the sheet constituting the gas discharge member 1 may be made of fluorine-based resin.
- the fluorine-based resin may include repeating units derived from tetrafluoroethylene, vinyl fluoride, vinylidene fluoride, or two or more monomers thereof.
- the fluorine-based resin may be more suitable for use as a material for the gas exhaust member 1.
- the gas permeability of the gas discharge member 1 may be 40 to 150 barrer at 60°C.
- the permeability to carbon dioxide may satisfy the above-mentioned range.
- the gas permeability may satisfy the above-mentioned range at 60°C.
- gas permeability can be measured by ASTM F2476-20.
- the moisture penetration amount of the gas discharge member 1 may be 10 mg to 100 mg for 10 years at 25°C and 50%RH.
- the amount of moisture infiltrated into the gas discharge member 1 satisfies the above-mentioned range, it can be more effective to prevent the infiltration of moisture flowing from the gas discharge member 1.
- the amount of moisture infiltration into the gas discharge member 1 can be measured by adopting the ASTM F 1249 method. At this time, it can be measured using equipment officially certified by MCOON.
- the thickness of the gas discharge member 1 may be 50 to 500 ⁇ m.
- gas may be more easily discharged to the outside, and heat bonding with the battery case may be easier.
- Figure 4 is a diagram showing a cross section taken along the A-A' axis of Figure 1.
- the hole 100 may be formed to penetrate the gas exhaust member 1 in the thickness direction of the gas exhaust member 1.
- the hole 100 is formed to penetrate the gas discharge member 1 in the thickness direction of the gas discharge member 1, the adhesion characteristics between the gas discharge member 1 and the battery case can be further improved.
- Figure 5 is a top view of a secondary battery according to an embodiment of the present invention.
- the secondary battery 10 includes an electrode assembly 20 and a case 30 for accommodating the electrode assembly 20 therein.
- the secondary battery 10 may include an electrode lead 40 and a lead film 50 connected to the electrode assembly 2.
- the electrode assembly 20 includes a positive electrode plate, a negative electrode plate, and a separator.
- the electrode assembly 20 may include a positive electrode plate and a negative electrode plate sequentially stacked with a separator in between.
- the positive electrode plate may include a positive electrode current collector made of a thin metal plate with excellent conductivity, for example, aluminum (Al) foil, and a positive electrode active material layer coated on at least one surface thereof. Additionally, the positive electrode plate may include a positive electrode tab made of a metal material, such as aluminum (Al), at one end. The positive electrode tab may protrude from one end of the positive electrode plate. The positive electrode tab may be welded to one end of the positive electrode plate or may be joined using a conductive adhesive.
- the negative electrode plate may include a negative electrode current collector made of a conductive metal thin plate, for example, copper (Cu) foil, and a negative electrode active material layer coated on at least one side of the negative electrode current collector. Additionally, the negative electrode plate may include a negative electrode tab formed of a metal material, such as nickel (Ni), at one end. The negative electrode tab may protrude from one end of the negative electrode plate. The negative electrode tab may be welded to one end of the negative electrode plate or may be joined using a conductive adhesive.
- the separator is located between the positive and negative electrode plates and electrically insulates the positive and negative plates from each other.
- the separator may be a porous membrane that allows lithium ions to pass between the positive and negative electrode plates.
- the separator may include, for example, a porous membrane using polyethylene (PE), polypropylene (PP), or a composite film thereof.
- An inorganic coating layer may be provided on the surface of the separator.
- the inorganic coating layer may have a structure in which inorganic particles are bonded to each other by a binder to form a pore structure (interstitial volume) between the particles.
- the electrode assembly 20 is a jelly-roll (wound type) electrode assembly composed of long sheet-shaped positive electrodes and negative electrodes wound with a separator interposed between them, and a plurality of positive electrodes and negative electrodes cut into units of a predetermined size with a separator interposed between them.
- a stacked (stacked) electrode assembly that is sequentially stacked in one state, and a stack of a structure in which bi-cells or full cells are wound by stacking a predetermined unit of anodes and cathodes with a separator interposed between them. /It may be a folding electrode assembly, etc.
- the case 30 includes a storage portion 31 that stores the electrode assembly therein and a sealing portion 32 that forms a structure that seals the outer periphery.
- the sealing portion 32 may be sealed by heat bonding using heat or a laser.
- Case 30 has a gas barrier layer and an inner resin layer containing a sealant resin.
- the gas barrier layer may be a metal layer.
- Case 30 may be a laminated sheet including a resin layer and a metal layer. More specifically, the case 30 is made of a laminated sheet and may include an outer resin layer forming the outermost layer, a barrier metal layer to prevent penetration of substances, and an inner resin layer for sealing.
- the outer resin layer is polyester using poly(ethylene terephthalate) (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolymerized polyester, polycarbonate, nylon, etc. It may include a based film and may be composed of a single layer or multiple layers.
- the barrier metal layer may include aluminum, copper, etc.
- the inner resin layer may contain a sealant resin or may be a layer made of a sealant resin, and may be composed of a single layer or multiple layers.
- the sealant resin may include polypropylene (PP), acid modified polypropylene (PPa), random polypropylene, ethylene propylene copolymer, or two or more thereof.
- Ethylene propylene copolymers may include, but are not limited to, ethylene-propylene rubber and ethylene-propylene block copolymers.
- Case 30 may be in the form of a pouch.
- the pouch-shaped case 30 may include an upper pouch and a lower pouch.
- the upper pouch and the lower pouch are arranged so that the sealant resins face each other, and then the opposing sealant resins are fused together by heat and pressure to seal the battery. You can.
- the fusion of the sealing portion 32 may be heat fusion, ultrasonic fusion, etc., but is not particularly limited as long as the sealing portion 32 can be fused.
- the sealing portion 32 may be sealed on four sides or on three sides at the edge of the case 30.
- the boundary surfaces of the upper and lower pouches are bent so that the storage portions 31 formed in the upper and lower pouches are overlapped, except for the bent portion. The edges of the remaining three sides are sealed.
- the electrode lead 40 is electrically connected to an electrode tab (not shown) included in the electrode assembly 20 and may protrude outward from the case 30 via the sealing portion 32 . Additionally, the lead film 50 may be located in a portion corresponding to the sealing portion 32 in at least one of the upper and lower portions of the electrode lead 40. Accordingly, the lead film 50 can prevent short circuits from occurring in the electrode lead 40 during fusion and improve the sealing properties of the sealing portion 32 and the electrode lead 40.
- an opening 60 is formed in a portion of the case 30.
- the opening 60 penetrates the case 30 in the thickness direction.
- a gas discharge member 1 according to an embodiment of the present invention is adhered to the inside of the opening 60.
- gas generated inside the battery may pass through the gas discharge member 1 and be discharged to the outside of the battery through the opening 60.
- the opening 60 may be formed in at least one of the upper or lower part of the case 30. That is, only one opening 60 may be formed, but a plurality of openings 60 may be formed.
- an opening 60 may be formed in a portion of the case 30 excluding the sealing portion 32 .
- the opening 60 may be formed according to a conventional method such as punching.
- the opening 60 may be formed in the case 30 at a stage before inserting the electrode assembly 20.
- the gas discharge member 1 according to an embodiment of the present invention is attached to the inside of the opening 60 to manufacture the secondary battery 10 having the gas discharge member 1. You can.
- the gas discharge member 1 is glued to cover the entire opening 60.
- the gas discharge member 1 may be attached to the inside of the opening 60 by heat fusion.
- the gas discharge member 1 can be attached to the inside of the opening 60 using a press or the like.
- a part of the case 30 that overlaps the gas discharge member 1 around the opening 60 may be inserted into the hole of the gas discharge member 1.
- the sealant resin of the inner resin layer overlapping the gas discharge member 1 may flow around the opening 60 and enter the hole of the gas discharge member 1. Accordingly, the adhesion characteristics between the gas discharge member 1 and the case 30 can be improved.
- the gas discharge member 1 is made of a gas-permeable sheet containing a fluorine-based resin, and the glass transition temperature of the fluorine-based resin may be higher than the glass transition temperature of the sealant resin constituting the inner resin layer. .
- the glass transition temperature of the fluorine-based resin is higher than that of the sealant resin, when the case 30 and the gas discharge member 1 are heat-sealed, the sealant resin is attached to the hole 100 formed in the gas discharge member 1. It may be easier than being penetrated.
- the glass transition temperature of the fluorine-based resin may be 30°C to 170°C.
- the glass transition temperature of the fluorine-based resin satisfies the above-mentioned range, when the case 30 and the gas discharge member 1 are heat-sealed, the sealant resin does not penetrate into the hole 100 formed in the gas discharge member 1. It can be easy.
- the glass transition temperature of the sealant resin may be -150°C to 0°C.
- the glass transition temperature of the sealant resin satisfies the above-mentioned range, when heat-sealing the case 30 and the gas discharge member 1, the sealant resin does not penetrate into the hole 100 formed in the gas discharge member 1. It can be easy.
- the sealant resin may include a polyolefin-based resin.
- the polyolefin-based resin may include polypropylene, polyethylene, polyvinyldifluoride (PVDF), or two or more thereof.
- Figure 6 is a cross-sectional view taken along the B-B' axis in Figure 5.
- sealant resin 2 is introduced into the hole 100 of the gas discharge member 1. Accordingly, the gas discharge member 1 can be easily fixed to the inside of the opening 60.
- an opening 60 that penetrates the case in the thickness direction is formed in a portion of the case.
- the size of the gas discharge member 1 is larger than the size of the opening 60 and thus covers the entire opening 6.
- the horizontal or vertical length of the gas discharge member 1 may be larger than the horizontal or vertical length of the opening 60.
- the diameter of the gas discharge member 1 may be larger than the diameter of the opening 60.
- the horizontal or vertical length of the gas discharge member 1 may be larger than the diameter of the opening 60.
- the size of the gas discharge member 1 is larger than the size of the opening 60, a sufficient area for the gas discharge member 1 to adhere to the inner resin layer located in the receiving portion 31 of the case can be secured. Therefore, it may be easier for the gas discharge member 1 to be attached to the case.
- the hole 100 of the gas discharge member 1 is located in a portion where the gas discharge member 1 overlaps the inner resin layer located in the housing portion 31 of the case.
- a portion of the inner resin layer overlapping with the gas discharge member 1 releases gas. It can be inserted into the hole 100 of the member 1. That is, the sealant resin 2 of the inner resin layer overlapping with the gas discharge member 1 around the opening 60 flows through treatment such as heating, laser, or ultrasonic waves and enters the hole of the gas discharge member 1. do. Accordingly, the adhesion between the gas exhaust member 1 and the case can be improved, and the adhesion durability can also be improved.
- the adhesion characteristics of the gas exhaust member 1 and the case are improved, the possibility of a gap occurring between the gas exhaust member 1 and the case is reduced even after the battery cell operates for a long time. Accordingly, the effect of the gas generated inside the battery cell being discharged through the gas discharge member is improved, and moisture penetration into the battery cell can be reduced.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Inorganic Chemistry (AREA)
Abstract
Description
Claims (20)
- 가스 투과성을 갖는 시트로서, 상기 시트의 주변부에 홀을 구비하는 가스 배출 부재.
- 제1항에 있어서,상기 주변부는 상기 시트의 끝단으로부터 시트 전체 길이의 2/5까지의 길이에 상응하는 영역인 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 주변부의 폭은 상기 시트의 끝단으로부터 2 mm 이상인 것을 특징으로 하는 가스 배출 부재.
- 제3항에 있어서,상기 주변부의 폭은 상기 시트의 끝단으로부터 15 mm 이하인 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 시트는 직사각형이고, 상기 홀은 상기 주변부의 양쪽 가로 영역 또는 양쪽 세로 영역에 위치하는 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 시트는 직사각형이고, 상기 홀은 상기 주변부의 양쪽 가로 영역 및 양쪽 세로 영역 모두에 위치하는 것을 특징으로 하는 가스 배출 부재.
- 제6항에 있어서,상기 홀은 상기 양쪽 가로 영역 각각에 2개 이상, 상기 양쪽 세로 영역 각각에 2개 이상 위치하는 것을 특징으로 하는 가스 배출 부재.
- 제7항에 있어서,상기 홀은 원형 또는 타원형의 단면을 갖는 것을 것을 특징으로 하는 가스 배출 부재.
- 제8항에 있어서,상기 홀의 직경이 10 ㎛ 내지 500 ㎛인 것을 특징으로 하는 가스 배출 부재.
- 제6항에 있어서,상기 홀은 직사각형이고, 상기 양쪽 가로 영역 각각에 1개 이상, 상기 양쪽 세로 영역 각각에 1개 이상 위치하는 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 홀이 가스 배출 부재의 두께 방향으로 가스 배출 부재를 관통하는 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 가스 배출 부재의 전체 면적 대비 상기 홀의 전체 면적이 5% 내지 50%인 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 가스 배출 부재의 가스 투과도(permeability)가 60℃에서 40 내지 150 barrer인 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 가스 배출 부재의 수분 침투량이 25℃, 50 %RH에서 10년간 10 mg 내지 100 mg인 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 가스 투과성을 갖는 시트는 불소계 수지를 포함하여 이루어진 것을 특징으로 하는 가스 배출 부재.
- 제1항에 있어서,상기 가스 배출 부재의 두께가 50 내지 500 ㎛인 것을 특징으로 하는 가스 배출 부재.
- 전극 조립체; 및 내부에 상기 전극 조립체를 수납하는 케이스;를 포함하고,상기 케이스는 가스 차단층 및 실란트 수지를 포함하는 내측 수지층을 구비하고,상기 케이스의 일부에 상기 케이스를 두께 방향으로 관통하는 개구부가 형성되고,상기 개구부의 내측에 상기 개구부 전체를 커버하도록 접착된 제1항 내지 제16항 중 어느 한 항의 가스 배출 부재를 구비하고,상기 가스 배출 부재에 구비된 홀은 상기 케이스의 내측 수지층과 중첩하는 부분에 위치하고,상기 가스 배출 부재에 구비된 홀 내에는 상기 내측 수지층의 실란트 수지가 인입된 것을 특징으로 하는 이차전지.
- 제17항에 있어서,상기 케이스가, 외측 수지층, 금속층으로 된 가스 차단층 및 상기 가스 차단층에 적층되며 실란트 수지를 포함하는 내측 수지층이 순차적으로 적층된 라미네이트 시트를 포함하는 것을 특징으로 하는 이차전지.
- 제17항에 있어서,상기 가스 배출 부재는 불소계 수지를 포함하는 가스 투과성 시트로 이루어지고, 상기 불소계 수지의 유리전이온도가 상기 실란트 수지의 유리전이온도보다 큰 것을 특징으로 하는 이차전지.
- 제17항에 있어서,상기 실란트 수지가 폴리프로필렌(Polypropylene), 폴리에틸렌(Polyethylene), 폴리비닐디플로라이드(Polyvinyldifluoride, PVDF), 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 이차전지.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA3219288A CA3219288A1 (en) | 2022-05-02 | 2023-02-08 | Gas release member and secondary battery comprising the same |
EP23799527.9A EP4333182A1 (en) | 2022-05-02 | 2023-02-08 | Gas discharging member and secondary battery comprising same |
CN202380011720.5A CN117337513A (zh) | 2022-05-02 | 2023-02-08 | 气体释放构件及包括该气体释放构件的二次电池 |
JP2023571370A JP2024520328A (ja) | 2022-05-02 | 2023-02-08 | ガス排出部材、及びそれを備える二次電池 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR20220054204 | 2022-05-02 | ||
KR10-2022-0054204 | 2022-05-02 |
Publications (1)
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WO2023214644A1 true WO2023214644A1 (ko) | 2023-11-09 |
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PCT/KR2023/001862 WO2023214644A1 (ko) | 2022-05-02 | 2023-02-08 | 가스 배출 부재 및 이를 구비한 이차전지 |
Country Status (6)
Country | Link |
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EP (1) | EP4333182A1 (ko) |
JP (1) | JP2024520328A (ko) |
KR (1) | KR102626846B1 (ko) |
CN (1) | CN117337513A (ko) |
CA (1) | CA3219288A1 (ko) |
WO (1) | WO2023214644A1 (ko) |
Citations (6)
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JPH09134732A (ja) * | 1995-11-10 | 1997-05-20 | Tanaka Kikinzoku Kogyo Kk | 薄型導電性ガス不透過基板、その製造方法、燃料電池用スタック構成部材及び燃料電池用スタック |
JPH11345599A (ja) * | 1998-06-01 | 1999-12-14 | Tdk Corp | シート型電気化学素子及びその製造方法 |
JP2004095471A (ja) * | 2002-09-03 | 2004-03-25 | Nissan Motor Co Ltd | ラミネート外装扁平型電池 |
JP6803927B2 (ja) * | 2017-01-19 | 2020-12-23 | 日本碍子株式会社 | セパレータ構造体、ニッケル亜鉛二次電池及び亜鉛空気二次電池 |
KR20210025405A (ko) * | 2019-08-27 | 2021-03-09 | 주식회사 엘지화학 | 이차 전지용 전지 케이스 및 가스 배출부 제조 방법 |
KR20220054204A (ko) | 2020-10-23 | 2022-05-02 | 엑시스 에이비 | 카메라 모션에 기반한 대체 이미지 프레임 생성 |
-
2023
- 2023-02-08 EP EP23799527.9A patent/EP4333182A1/en active Pending
- 2023-02-08 JP JP2023571370A patent/JP2024520328A/ja active Pending
- 2023-02-08 CA CA3219288A patent/CA3219288A1/en active Pending
- 2023-02-08 WO PCT/KR2023/001862 patent/WO2023214644A1/ko active Application Filing
- 2023-02-08 KR KR1020230017039A patent/KR102626846B1/ko active IP Right Grant
- 2023-02-08 CN CN202380011720.5A patent/CN117337513A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH09134732A (ja) * | 1995-11-10 | 1997-05-20 | Tanaka Kikinzoku Kogyo Kk | 薄型導電性ガス不透過基板、その製造方法、燃料電池用スタック構成部材及び燃料電池用スタック |
JPH11345599A (ja) * | 1998-06-01 | 1999-12-14 | Tdk Corp | シート型電気化学素子及びその製造方法 |
JP2004095471A (ja) * | 2002-09-03 | 2004-03-25 | Nissan Motor Co Ltd | ラミネート外装扁平型電池 |
JP6803927B2 (ja) * | 2017-01-19 | 2020-12-23 | 日本碍子株式会社 | セパレータ構造体、ニッケル亜鉛二次電池及び亜鉛空気二次電池 |
KR20210025405A (ko) * | 2019-08-27 | 2021-03-09 | 주식회사 엘지화학 | 이차 전지용 전지 케이스 및 가스 배출부 제조 방법 |
KR20220054204A (ko) | 2020-10-23 | 2022-05-02 | 엑시스 에이비 | 카메라 모션에 기반한 대체 이미지 프레임 생성 |
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JP2024520328A (ja) | 2024-05-24 |
CA3219288A1 (en) | 2023-09-11 |
KR20230154738A (ko) | 2023-11-09 |
KR102626846B1 (ko) | 2024-01-19 |
EP4333182A1 (en) | 2024-03-06 |
CN117337513A (zh) | 2024-01-02 |
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