WO2023075168A1 - 전기화학소자용 전극 리드 및 이를 구비한 전기화학소자 - Google Patents
전기화학소자용 전극 리드 및 이를 구비한 전기화학소자 Download PDFInfo
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- WO2023075168A1 WO2023075168A1 PCT/KR2022/014349 KR2022014349W WO2023075168A1 WO 2023075168 A1 WO2023075168 A1 WO 2023075168A1 KR 2022014349 W KR2022014349 W KR 2022014349W WO 2023075168 A1 WO2023075168 A1 WO 2023075168A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M50/172—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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
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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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/191—Inorganic material
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- H—ELECTRICITY
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- 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
- H01M50/19—Sealing members characterised by the material
- H01M50/195—Composite material consisting of a mixture of organic and inorganic materials
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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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/197—Sealing members characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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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
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
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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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—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
- H01M50/50—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
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- 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 an electrode lead for an electrochemical device and an electrochemical device having the same.
- the secondary battery is an eco-friendly battery technology that can be used repeatedly through charge and discharge and does not use harmful substances such as lead, nickel, and cadmium. With its advantages, it forms the core of the future new growth engine industry.
- lithium secondary batteries are most widely used as a power source for mobile IT, which is closely related to human life, and recently, their utilization continues to expand as a power source for electric vehicles and a power storage device for renewable energy.
- an electrochemical device consists of a positive electrode, a negative electrode, a separator separating them, an electrolyte that delivers lithium ions through the separator, a battery case accommodating them, and an electrode lead that allows current to flow out of the battery case. It consists of In addition, a lead film may be further included. The lead film serves to seal the electrode lead and the battery case while preventing a short circuit between the electrode lead and the battery case by being bound to the electrode lead.
- the sealing strength between the electrode lead and the battery case is influenced by the sealing strength between the electrode lead and the lead film and between the lead film and the battery case.
- the problem to be solved by the present invention is to provide an electrode lead for an electrochemical device having improved adhesion between the electrode lead and the lead film, and an electrochemical device having the same.
- an electrode lead for an electrochemical device of the following embodiments is provided.
- a coating layer located on the nickel plating layer and containing a polar group includes,
- the coating layer relates to an electrode lead for an electrochemical device, characterized in that it has a concavo-convex structure.
- the polar group may be -OH group or -O group.
- the coating layer including the polar group may include an anhydride.
- the anhydrous oxide may include chromium-based anhydrous oxide, zirconium-based anhydrous oxide, titanium-based anhydrous oxide, manganese-based anhydrous oxide, molybdenum-based anhydrous oxide, cerium-based anhydrous oxide, or two or more of these.
- the coating layer including the polar group may further include a binder polymer.
- the binder polymer may include polyvinyl alcohol, an acrylic polymer, an epoxy polymer, an olefin polymer, a phenol resin, or two or more of these.
- the concavo-convex structure may be formed by rolling, sandblasting, grinding with SiC paper, mechanical surface treatment by applying laser irradiation or ultrasonic waves, chemical surface treatment by partial erosion by chemical substances, or a combination thereof.
- an electrochemical device of the following embodiments is provided.
- a lead film covering a part of the outer surface of the electrode lead and interposed between the electrode lead and the battery case;
- the electrode lead relates to an electrochemical device comprising the electrode lead for an electrochemical device according to any one of the first to seventh embodiments.
- the lead film may include a non-polar polymer resin, a polar polymer resin, or a combination thereof.
- the non-polar polymer resin is stretched polypropylene (OPP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polyimide (PI), or Two or more of these may be included.
- OPP polypropylene
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PBT polybutylene terephthalate
- PBN polybutylene naphthalate
- PI polyimide
- the polar polymer resin may include acid modified PP (PPa).
- the polar polymer resin may be maleic acid, maleic anhydride, fumaric acid, maleimide, maleimide, itaconic acid, itaconic anhydride, derivatives thereof, or two or more polar groups introduced therein.
- the electrode lead may be a cathode lead
- the cathode lead may include a metal terminal plated with nickel of the nickel plating layer.
- An electrochemical device includes a coating layer including a concave-convex structure and a polar group on the surface of a metal terminal, so that adhesion between an electrode lead and a lead film can be improved.
- the surface of the metal terminal has a concave-convex structure
- the surface of the electrode lead is not damaged, so that the adhesion between the electrode lead and the lead film can be improved without impairing corrosion resistance.
- FIG. 1 is a diagram showing an electrode lead for an electrochemical device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an electrochemical device according to an embodiment of the present invention.
- FIG 3 is an enlarged view showing an interface between an electrode lead and a lead film in an electrochemical device according to an embodiment of the present invention.
- FIG 4 is an enlarged view showing an interface between an electrode lead and a lead film in an electrochemical device according to an embodiment of the present invention.
- Example 5 is a SEM image of the surface portion of the electrode lead in contact with the lead film in the electrode lead manufactured in Example 1.
- Example 6 is a view showing Survey Scan Spectrum of a cross section of a portion in contact with the lead film and a portion not in contact with the lead film in the electrode lead manufactured in Example 1.
- An electrode lead for an electrochemical device is characterized in that it has a concave-convex structure on the surface of a metal terminal and includes a coating layer containing a polar group on the surface of the metal terminal having the concave-convex structure.
- FIG. 1 is a diagram showing an electrode lead for an electrochemical device according to an embodiment of the present invention.
- an electrode lead 10 for an electrochemical device has a concavo-convex structure on the surface of a metal terminal. Specifically, the concave-convex structure is formed on the surface of the electrode lead at a portion in contact with the lead film.
- the electrode lead 10 for an electrochemical device provides a high surface area to the electrode lead by having a concavo-convex structure on the surface of a metal terminal and provides a high surface area between the electrode lead and the lead film through the anchor effect. Adhesion can be improved. In addition, when moisture penetrates into the joint between the lead film and the electrode lead or the electrolyte solution leaks, the movement path of the electrolyte solution can be significantly extended to suppress the movement of moisture or electrolyte solution as much as possible.
- the concavo-convex structure may be formed over the entire contact surface between the electrode lead and the lead film or may be formed on a part thereof.
- the concavo-convex structure may be formed in various ways. For example, it may be formed by mechanical surface treatment such as rolling, sandblasting, SiC paper grinding, laser irradiation, or application of ultrasonic waves, or chemical surface treatment such as partial erosion by chemical substances. Alternatively, mechanical surface treatment and chemical surface treatment may be performed in parallel.
- the temper rolling method means light cold rolling of about 0.3 to 3.0% of the electrode leads in order to improve the mechanical properties of the annealed electrode leads and to adjust the surface condition.
- Partial erosion by chemicals for example, by applying phosphoric acid, hydrochloric acid, nitric acid, etc. to the electrode lead and washing it with distilled water after a period of time sufficient to form desired fine irregularities has elapsed, thereby creating a concavo-convex structure on the surface of the electrode lead.
- the formation of the concave-convex structure and its orientation are not particularly limited, but a plurality of grooves inclined at 0° (horizontal) to 49° with respect to the surface of the electrode lead not in contact with the lead film may be formed. there is. Such a groove may more easily increase the contact area with the lead film, and may more easily extend the movement length of moisture and electrolyte.
- the size of the concavo-convex (ie, depth of the valley) may be 1% to 50% based on the thickness of the electrode lead.
- adhesion between the electrode lead and the lead film may be further improved, and it may be more advantageous to extend the movement path of moisture or the like.
- it may be easy to prevent mechanical properties of the electrode lead 10 from being damaged.
- an electrode lead 10 for an electrochemical device includes a coating layer 11 including a polar group on the surface of the metal terminal having the concavo-convex structure.
- the polar group may improve adhesion between the electrode lead and the lead film by allowing the lead film and the electrode lead to form a van der Waals bond, which is an electrostatic attraction. Also, the corrosion resistance of the electrode lead surface can be increased.
- the polar group may be -OH group or -O group.
- the coating layer 11 including the polar group may include an anhydride.
- the anhydride may include an -OH group or -O group to form a van der Waals bond between the lead film and the electrode lead 10, so that it may be easier to improve adhesion between the electrode lead 10 and the lead film.
- the anhydride may be a chromium-based anhydride or a chromium-free anhydride.
- the chromium-based anhydride may include, for example, zirconium-based anhydride, titanium-based anhydride, manganese-based anhydride, molybdenum-based anhydride, cerium-based anhydride, or two or more of these.
- the coating layer 11 containing a polar group may be formed on the surface of the electrode lead 10 through chromate treatment.
- Chromate treatment is performed by immersing an electrode lead in a treatment solution containing chromic acid (usually a mixture of chromic acid and sulfuric acid) to form a chromate film on the surface of the electrode lead to improve corrosion resistance and to form gloss on the surface. .
- the treatment solution for the chromate treatment includes 1 to 4% by weight of red blood salt, 3 to 8% by weight of trivalent chromium or hexavalent chromium, 8 to 15% by weight of fluoric acid, and 5 to 10% by weight of zircofluoric acid, based on the total weight of the treatment solution. and 63 to 83% by weight of an aqueous solution of sulfuric acid.
- the deposition time may be 30 to 50 seconds, and the process temperature may be 15 to 50 °C.
- a metal oxide film may be formed using a metal salt or a metal precursor.
- a zirconium oxide film can be formed from hexafluoro zirconic acid (H 2 ZrF 6 ), and hexafluoro titanic acid (H 2 TiF 6 ) is widely used when forming a titanium oxide film.
- H 2 ZrF 6 hexafluoro zirconic acid
- H 2 TiF 6 hexafluoro titanic acid
- the coating layer 11 including the polar group may further include a binder polymer.
- the coating layer 11 including the polar group further includes a binder polymer, adhesion between the electrode lead and the lead film may be further increased.
- the binder polymer may include polyvinyl alcohol, an acrylic polymer, an epoxy polymer, an olefin polymer, a phenol resin, or two or more of these.
- An electrode lead for an electrochemical device is provided with a coating layer including a concave-convex structure and a polar group on the surface of the electrode lead, so that it can have effects of mechanical bonding and chemical bonding between the electrode lead and the lead film at the same time. .
- An electrochemical device includes an electrode assembly to which an electrode lead is attached; a battery case accommodating the electrode assembly; and a lead film covering a part of the outer surface of the electrode lead and interposed between the electrode lead and the battery case, and comprising the electrode lead described above.
- FIG. 2 is an enlarged view of an electrochemical device according to an embodiment of the present invention.
- an electrochemical device 100 includes an electrode assembly 20 to which electrode leads 10 are attached and a battery case 30 .
- the electrode assembly 20 includes a positive electrode plate, a negative electrode plate, and a separator.
- a positive electrode plate and a negative electrode plate may be sequentially stacked with a separator interposed therebetween.
- the positive electrode plate may include a positive electrode current collector made of a thin metal plate having excellent conductivity, for example, aluminum (Al) foil, and a positive electrode active material layer coated on at least one surface thereof.
- the positive electrode plate may include a positive electrode tab made of a metal material, for example, an aluminum (Al) material, at one end. The positive electrode tab may extend and protrude from one end of the positive electrode plate, or may be welded to one end of the positive electrode plate or bonded 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 surface thereof.
- the negative electrode plate may include a negative electrode tab formed of a metal material, such as copper (Cu) or nickel (Ni), at one end. The negative electrode tab may extend and protrude from one end of the negative electrode plate, or may be welded to one end of the positive electrode plate or bonded using a conductive adhesive.
- the separator may be interposed between the positive electrode plate and the negative electrode plate to electrically insulate the positive electrode plate and the negative electrode plate from each other, and may be formed in a porous film form so that lithium ions or the like may pass between the positive electrode plate and the negative electrode plate.
- a 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 an interstitial volume between the particles.
- the electrode assembly 20 includes a jelly-roll (wound type) electrode assembly having a structure in which long sheet-shaped positive electrodes and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive electrodes and negative electrodes cut in units of a predetermined size through a separator.
- a stacked (stacked) electrode assembly sequentially stacked in one state, a bi-cell in which positive and negative electrodes in a predetermined unit are stacked with a separator interposed therebetween, or a stack structure in which full cells are wound /folding type electrode assemblies; and the like.
- the battery case 30 serves to accommodate the electrode assembly 20 .
- the battery case 30 may include an accommodating portion 30a accommodating the electrode assembly 20 and a sealing portion 30b formed to seal the electrode assembly 20.
- the sealing portion 30b may include a sealant resin, and the sealant resin may be fused along an outer circumferential surface of the accommodating portion 30a to seal the electrode assembly 20 .
- the fusion may be thermal fusion or ultrasonic fusion, but is not particularly limited as long as the sealing portion 30b can be fused.
- the battery case 30 will be provided in the form of a film having a multilayer structure of an outer layer for external impact protection, a metal barrier layer for blocking moisture, and a sealant layer for sealing the battery case 30.
- the outer layer is other polyester-based films such as poly(ethylene terephthalate) (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, co-polyester, polycarbonate, nylon, etc. It may include, and may be composed of a single layer or multiple layers.
- PET poly(ethylene terephthalate)
- PET polybutylene terephthalate
- polyethylene naphthalate polybutylene naphthalate
- co-polyester polycarbonate
- nylon nylon
- the metal barrier layer may include aluminum, copper, or the like.
- the sealant layer may include a sealant resin and may be composed of a single layer or multiple layers.
- the sealant resin includes polypropylene (PP), acid modified polypropylene (PPa), random polypropylene, ethylene propylene copolymer, or two or more of these can do.
- the ethylene propylene copolymer may include ethylene-propylene rubber, ethylene-propylene block copolymer, etc., but is not limited thereto.
- the battery case 30 may be in the form of a pouch.
- the battery case 30 when the battery case 30 is in the form of a pouch, it may include an upper pouch and a lower pouch.
- the battery case 30 when the battery case 30 includes an upper pouch and a lower pouch, the outer circumferential surfaces of the upper pouch and the lower pouch are fused to each other by heat and pressure, thereby sealing the battery.
- the sealing part 30b may be sealed on four sides or three sides at the edge of the battery case.
- the boundary surface of the upper pouch and the lower pouch is bent so that the electrode assembly accommodating portions 30a formed in the upper pouch and the lower pouch overlap each other. It means a structure in which the edges of the remaining three sides are sealed except for the bent part in
- the electrode lead 10 may be accommodated in the battery case 30 such that a portion thereof is exposed to the outside of the battery case 30 .
- an electrochemical device 100 includes a lead film 40 .
- the lead film 40 covers a part of the outer surface of the electrode lead 10 and is interposed between the electrode lead 10 and the battery case 30 .
- the lead film 40 is interposed between the electrode lead 10 and the battery case 30 and helps binding of the electrode lead 10 and the battery case 30 .
- the sealing of the battery occurs on the surface where the lead film 40 comes into contact with the battery case 30 .
- the lead film 40 may be positioned on at least one surface of the electrode lead 10 .
- the lead film 40 is placed on the upper and lower surfaces of the electrode lead 10 to face each other and thermally fused between the electrode lead 10 and the lead film 40 or between the lead film 40 and the battery case 30. can be joined by
- the lead film 40 may include a non-polar polymer resin, a polar polymer resin, or a combination thereof.
- the non-polar polymer resin is stretched polypropylene (OPP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN) , polyimide (PI), or two or more of these.
- OPP polypropylene
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PBT polybutylene terephthalate
- PBN polybutylene naphthalate
- PI polyimide
- 3 and 4 are diagrams showing an enlarged interface between an electrode lead and a lead film in an electrochemical device according to an embodiment of the present invention.
- the lead film 40 when the lead film 40 includes a polar polymer resin, van der Waals bonding strength between the polar group of the lead film 40 and the polar group of the electrode lead 10 may be increased. Accordingly, the adhesive force between the electrode lead 10 and the lead film 40 may be further improved.
- the polar polymer resin may include acid modified PP (PPa).
- PPa acid modified PP
- the polar group of the acid-modified polypropylene and the polar group of the electrode lead 10 are van der Waals bonded to further increase the adhesive force between the electrode lead 10 and the lead film 40. It can be.
- the polypropylene resin may include a propylene polymer (homo-polypropylene), a propylene copolymer (PP co-polymer), a propylene ter-polymer (PP ter-polymer), and the like.
- the propylene copolymer (PP co-polymer) may include a propylene-ethylene block copolymer, etc.
- the propylene terpolymer (PP ter-polymer) may include a propylene-ethylene-butylene block copolymer, etc.
- the polar polymer resin may be maleic acid, maleic anhydride, fumaric acid, maleimide, maleimide, itaconic acid, itaconic anhydride, derivatives thereof, or two or more polar groups introduced therein. .
- the electrode lead 10 may be an anode lead or a cathode lead.
- a metal terminal constituting the electrode lead 10 may include aluminum metal, which is advantageous in conductivity.
- a metal terminal constituting the electrode lead 10 may be a metal terminal plated with nickel.
- the metal terminal constituting the electrode lead 10 is plated with nickel, corrosion of the electrode lead 10 can be prevented from a long-term perspective while being advantageous in terms of conductivity. That is, when the electrode lead 10 includes a metal terminal plated with nickel and includes a coating layer 11 including a concave-convex structure and a polar group on the surface of the metal terminal plated with nickel, corrosion resistance is not impaired. Adhesion between the electrode lead 10 and the lead film 40 may be improved.
- the metal terminal constituting the electrode lead 10 may be a metal terminal plated with nickel.
- the electrode lead 10 may include the metal terminal, a nickel plating layer positioned on a surface of the metal terminal, and a coating layer 11 positioned on the nickel plating layer and including a polar group.
- the electrode lead in the electrochemical device according to an embodiment of the present invention may not damage the nickel plating due to the uneven structure on the surface of the electrode lead. there is.
- the size of the concavo-convex structure is set thin by limiting the thickness of the coating layer 11, the nickel plating on the surface of the metal terminal may remain intact. Accordingly, the surface of the nickel-plated metal terminal is not physically or chemically damaged, and contact force between the electrode lead 10 and the lead film 40 can be improved without impairing corrosion resistance.
- Ni Strike process for improving the adhesion of nickel plating by forming a weak nickel plating film or a Ni Plating process for forming a Ni plating film with a desired thickness may be used.
- a nickel plating film was formed on the surface of a copper foil with a thickness of 200 ⁇ m by an electrochemical method (electrolytic plating method) using a plating solution in which 600 ml/L of nickel sulfamate, 6 g/L of nickel chloride, and 30 g/L of boric acid were mixed. .
- An electrode lead was immersed in a treatment solution containing 800 ppm to 1000 ppm of chromium on the surface of the copper foil on which the nickel plating film was formed to form a chromate film containing polar groups on the surface of the electrode lead.
- the surface-treated copper foil was attached to the electrode tab of the electrode assembly by welding, and a polypropylene film having a maleic acid polar group was attached to the top and bottom surfaces of the copper foil, respectively, to prepare an electrode lead.
- XPS X-ray photoelectron spectroscopy
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- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
| 리드 필름과 접하는 부분 | 리드 필름과 접하지 않는 부분 | |||
| 평균(at.%, 3 points) | 편차(at.%, 3 points) | 평균(at.%, 3 points) | 편차(at.%, 3 points) | |
| C | 45.9 | 3.1 | 70.4 | 0.6 |
| Ca | 0.8 | 0.05 | 1.3 | 0.02 |
| Cr | 1.4 | 0.1 | 1.0 | 0.04 |
| N | 1.4 | 0.1 | 1.2 | 0.1 |
| Ni | 1.9 | 0.4 | 1.1 | 0.1 |
| O | 37.6 | 1.8 | 20.0 | 0.7 |
| P | 7.6 | 0.7 | 2.4 | 0.1 |
| Si | 3.1 | 0.2 | 2.3 | 0.1 |
| Ti | 0.3 | 0.04 | 0.3 | 0.01 |
Claims (13)
- 금속 단자;상기 금속 단자의 표면에 위치하는 니켈 도금층; 및상기 니켈 도금층 상에 위치하고, 극성기를 포함하는 코팅층;을 포함하고,상기 코팅층은 요철 구조를 가지는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제1항에 있어서,상기 극성기가 -OH기 또는 -O기인 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제1항에 있어서,상기 극성기를 포함하는 코팅층이 무수산화물을 포함하는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제3항에 있어서,상기 무수산화물이 크롬계 무수산화물, 지르코늄계 무수산화물, 티타늄계 무수산화물, 망간계 무수산화물, 몰리브덴계 무수산화물, 세륨계 무수산화물, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제1항에 있어서,상기 극성기를 포함하는 코팅층이 바인더 고분자를 더 포함하는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제5항에 있어서,상기 바인더 고분자가 폴리비닐알콜, 아크릴계 고분자, 에폭시계 고분자, 올레핀계 고분자, 페놀 수지, 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 제1항에 있어서,상기 요철 구조가 압연, 샌드블라스팅, SiC 페이퍼에 의한 그라인딩, 레이저 조사 또는 초음파 인가의 기계적 표면처리, 화학물질에 의한 부분 침식의 화학적 표면처리, 또는 이들을 병행하여 형성되는 것을 특징으로 하는 전기화학소자용 전극 리드.
- 전극 리드가 부착된 전극 조립체;상기 전극 조립체를 수납하는 전지 케이스; 및상기 전극 리드의 외면의 일부를 감싸고, 상기 전극 리드와 전지 케이스 사이에 개재된 리드 필름;을 구비하고,상기 전극 리드는 제1항 내지 제7항 중 어느 한 항에 따른 전기화학소자용 전극 리드를 포함하는 것을 특징으로 하는 전기화학소자.
- 제8항에 있어서,상기 리드 필름이 무극성 고분자 수지, 극성 고분자 수지, 또는 이들의 조합을 포함하는 것을 특징으로 하는 전기화학소자.
- 제9항에 있어서,상기 무극성 고분자 수지가 연신 폴리프로필렌(OPP), 폴리에틸렌테레프탈레이트(PET), 폴리에틸렌나프탈레이트(PEN), 폴리부틸렌테레프탈레이트(PBT), 폴리부틸렌나프탈레이트(PBN), 폴리이미드(PI), 또는 이들 중 2 이상을 포함하는 것을 특징으로 하는 전기화학소자.
- 제9항에 있어서,상기 극성 고분자 수지가 산변성 폴리프로필렌(Acid modified PP, PPa)을 포함하는 것을 특징으로 하는 전기화학소자.
- 제9항에 있어서,상기 극성 고분자 수지가 산말레인산, 무수말레인산, 푸마르산, 말레이미드, 무수말레이미드, 이타콘산, 무수이타콘산, 이들의 유도체, 또는 이들 중 2 이상의 극성기가 도입된 것을 특징으로 하는 전기화학소자.
- 제8항에 있어서,상기 전극 리드가 음극 리드이고,상기 음극 리드가 상기 니켈 도금층의 니켈로 도금된 금속 단자를 포함하는 것을 특징으로 하는 전기화학소자.
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|---|---|---|---|
| EP22887372.5A EP4277009A4 (en) | 2021-10-28 | 2022-09-26 | ELECTRODE CONDUCTOR FOR ELECTROCHEMICAL DEVICE AND ELECTROCHEMICAL DEVICE COMPRISING SAME |
| US18/274,542 US20240088531A1 (en) | 2021-10-28 | 2022-09-26 | Electrode Lead for Electrochemical Device and Electrochemical Device Including the Same |
| CN202280009420.9A CN116745989A (zh) | 2021-10-28 | 2022-09-26 | 用于电化学装置的电极引线和包括其的电化学装置 |
| JP2023542617A JP2024503457A (ja) | 2021-10-28 | 2022-09-26 | 電気化学素子用電極リード及びこれを備えた電気化学素子 |
| JP2025113172A JP2025129346A (ja) | 2021-10-28 | 2025-07-03 | 電気化学素子用電極リード及びこれを備えた電気化学素子 |
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| KR1020210146111A KR102959689B1 (ko) | 2021-10-28 | 전기화학소자용 전극 리드 및 이를 구비한 전기화학소자 |
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| EP (1) | EP4277009A4 (ko) |
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| KR102954927B1 (ko) * | 2023-08-30 | 2026-04-21 | 주식회사 엘지에너지솔루션 | 전극 리드, 이의 제조 방법 및 이를 포함하는 리튬 이차전지 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20240088531A1 (en) | 2024-03-14 |
| EP4277009A1 (en) | 2023-11-15 |
| CN116745989A (zh) | 2023-09-12 |
| KR20230061157A (ko) | 2023-05-08 |
| JP2025129346A (ja) | 2025-09-04 |
| EP4277009A4 (en) | 2025-06-25 |
| JP2024503457A (ja) | 2024-01-25 |
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