WO2023184361A1 - Dispositif électrochimique et dispositif électronique comprenant celui-ci - Google Patents

Dispositif électrochimique et dispositif électronique comprenant celui-ci Download PDF

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Publication number
WO2023184361A1
WO2023184361A1 PCT/CN2022/084457 CN2022084457W WO2023184361A1 WO 2023184361 A1 WO2023184361 A1 WO 2023184361A1 CN 2022084457 W CN2022084457 W CN 2022084457W WO 2023184361 A1 WO2023184361 A1 WO 2023184361A1
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Prior art keywords
electrochemical device
resin
packaging film
electrode assembly
present application
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PCT/CN2022/084457
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English (en)
Chinese (zh)
Inventor
侯天昊
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宁德新能源科技有限公司
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Priority to PCT/CN2022/084457 priority Critical patent/WO2023184361A1/fr
Priority to CN202280090554.8A priority patent/CN118591931A/zh
Publication of WO2023184361A1 publication Critical patent/WO2023184361A1/fr

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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
    • H01M50/122—Composite material consisting of a mixture of organic and inorganic materials
    • 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

Definitions

  • the present application relates to the field of energy storage, and specifically to an electrochemical device and an electronic device containing the electrochemical device.
  • Electrode assemblies packaged in soft packages and metal shells mainly face the following two problems: First, the seal/flange edge occupies a certain volume, which will reduce the volumetric energy density of the electrochemical device. Second, electrochemical device products have a single form, such as special-shaped batteries. Soft packaging is difficult, the metal shell is expensive, and there is a risk of damage to the sealing edge.
  • this application provides an electrochemical device and an electronic device including the electrochemical device.
  • the encapsulation film in the electrochemical device of the present application accounts for a small volume, which can increase the volumetric energy density of the electrochemical device and meet the packaging needs of special-shaped electrochemical devices.
  • the present application provides an electrochemical device, which includes an electrode assembly and a packaging film for packaging the electrode assembly, wherein the packaging film is in a closed form, the mass swelling rate of the packaging film is ⁇ W, and the volume of the packaging film The swelling rate ⁇ V satisfies: 0 ⁇ W ⁇ 20%, -10% ⁇ V ⁇ 10%.
  • the packaging film of this application is in a closed form and does not have edge sealing and other structures that do not contribute to energy storage, which can improve the space utilization of the electrochemical device and thereby increase its volumetric energy density.
  • the function of the packaging film of this application is to seal the electrode assembly to prevent the electrode assembly from direct contact with the electrolyte. It is electrolyte resistant and ensures no leakage after sealing.
  • the packaging film is made into a material with a thickness of 1 mm and soaked in the electrolyte at 85°C for 30 hours, the mass swelling rate M ⁇ 20% and the volume swelling rate -10% ⁇ V ⁇ 10%, where the component of the electrolyte is solvent And lithium salt, the solvent is ethylene carbonate, propylene carbonate, diethyl carbonate and ethylene glycol propyl ether mixed in a mass ratio of 30:10:30:30, the lithium salt is lithium hexafluorophosphate with a concentration of 1mol/L.
  • the solvent is ethylene carbonate, propylene carbonate, diethyl carbonate and ethylene glycol propyl ether mixed in a mass ratio of 30:10:30:30
  • the lithium salt is lithium hexafluorophosphate with a concentration of 1mol/L.
  • the mass content of metal elements in the packaging film is less than 80%.
  • the bonding force between the packaging film and the surface of the electrode assembly is F, 3N/mm ⁇ F ⁇ 20N/mm.
  • the encapsulation film includes synthetic resin and optional inorganic particles.
  • the synthetic resin includes one or more of thermosetting resin or thermoplastic resin.
  • the thermosetting resin includes one or more of phenolic resin, epoxy resin, melamine resin, polyimide resin, polyester resin, acrylic resin, silicone resin or cross-linked polyolefin resin. kind.
  • the thermoplastic resin includes polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone or polyethylene terephthalate. one or more.
  • the inorganic particles include one or more of aluminum oxide, silicon oxide, or silica sol. According to some embodiments of the present application, the particle size of the inorganic particles ranges from 0.04 ⁇ m to 100 ⁇ m.
  • the encapsulation film is formed by applying a raw material liquid containing synthetic resin and optional inorganic particles to the surface of the electrode assembly.
  • coating includes one or more of spraying, scraping, dipping or brushing.
  • the coating and encapsulation method is used to integrally form the encapsulating film on the surface of the electrode assembly, and is chemically bonded to the tabs. There is no need to perform operations such as heat sealing or welding, thus saving space on the sealing edge. It can greatly improve the space utilization of electrochemical devices and increase their volumetric energy density.
  • the coating packaging method of the present application can also better meet the packaging requirements of special-shaped electrochemical devices.
  • the present application provides an electronic device including the electrochemical device of the first aspect.
  • the packaging film of the electrochemical device of the present application is in a closed form, and there are no edge sealing and other structures that do not contribute to the storage of energy, which can improve the space utilization of the electrochemical device and thereby increase its volumetric energy density; at the same time, the packaging film of the present application It can meet the requirements of packaging of special-shaped electrochemical devices.
  • Figure 1 is an X-ray CT image of an aluminum-plastic film-encapsulated electrode assembly in the prior art.
  • Figure 2 is an X-ray CT image of an electrode assembly encapsulated in a metal shell in the prior art.
  • Figure 3 is an X-ray CT image of an encapsulating film encapsulated electrode assembly according to some embodiments of the present application.
  • Figure 4 is a schematic diagram of an encapsulation film according to an embodiment of the present application, where 1 represents an encapsulation film.
  • Figure 5 is a schematic structural diagram of an encapsulation film and an electrode assembly according to an embodiment of the present application, in which 1 is an encapsulation film; 2 is an electrode assembly.
  • any lower limit can be combined with any upper limit to form an unexpressed range; and any lower limit can be combined with other lower limits to form an unexpressed range, and likewise any upper limit can be combined with any other upper limit to form an unexpressed range.
  • each individually disclosed point or single value may itself serve as a lower or upper limit in combination with any other point or single value or with other lower or upper limits to form a range not expressly recited.
  • a list of items connected by the terms "at least one of,” “at least one of,” or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, the phrase “at least one of A and B” means only A; only B; or A and B. In another example, if the items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B and C.
  • Item A may contain a single component or multiple components.
  • Item B may contain a single component or multiple components.
  • Item C may contain a single component or multiple components.
  • electrode assembly refers to the part of an electrochemical device consisting of a positive electrode, a negative electrode, and a separator.
  • closed form means that the morphology of the packaging film is uniform throughout, and there is no structure formed by heat sealing or welding.
  • any part that does not contain tabs or poles within the scope of the CT cross-sectional view, there are no obvious traces of welding and heat sealing in each layer of the packaging film, showing closed characteristics. More clearly, the above-mentioned cross-section can be observed through an optical microscope and any other microscopic imaging method.
  • thermosetting resin refers to a resin having thermosetting properties.
  • the thermosetting property refers to the property of producing chemical changes after heating and gradually hardening and molding. After hardening and molding, it cannot dissolve even when it is heated to a temperature above the glass transition temperature Tg or melting point Tm. According to the test standards of the standard “GB/T 3682.1-2018", the melt index should be ⁇ 1g/10min. Including but not limited to phenolic resin, epoxy resin, melamine resin, polyimide resin, polyester resin, acrylic resin, silicone resin, cross-linked polyolefin resin and mixtures thereof.
  • thermoplastic resin refers to a resin having thermoplastic properties.
  • the thermoplasticity refers to the property of being repeatedly softened by heat and solidified by cooling without chemical reaction. According to the standard “GB/T 3682.1-2018", the melt index should be greater than 1g/10min. Including but not limited to polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, polyethylene terephthalate and mixtures thereof.
  • the present application provides an electrochemical device, which includes an electrode assembly and a packaging film for packaging the electrode assembly, wherein the packaging film is in a closed form, the mass swelling rate of the packaging film is ⁇ W, and the volume of the packaging film The swelling rate ⁇ V satisfies: 0 ⁇ W ⁇ 20%, -10% ⁇ V ⁇ 10%.
  • the packaging film of this application is in a closed form and does not have edge sealing and other structures that do not contribute to energy storage, which can improve the space utilization of the electrochemical device and thereby increase its volumetric energy density.
  • the function of the packaging film of this application is to seal the electrode assembly to prevent the electrode assembly from direct contact with the electrolyte. It is electrolyte resistant and ensures no leakage after sealing.
  • the packaging film is made into a material with a thickness of 1 mm and soaked in the electrolyte at 85°C for 30 hours, the mass swelling rate M ⁇ 20% and the volume swelling rate -10% ⁇ V ⁇ 10%, where the component of the electrolyte is solvent And lithium salt, the solvent is ethylene carbonate, propylene carbonate, diethyl carbonate and ethylene glycol propyl ether in a mass ratio of 30:10:30:30.
  • the lithium salt is lithium hexafluorophosphate with a concentration of 1 mol/L.
  • the packaging film in this application has a multi-layer structure.
  • the "closed form" of the packaging film means that the shape of each layer of the packaging film is uniform everywhere, and there is no structure formed by heat sealing or welding, for example, by X-ray
  • heat sealing or welding for example, by X-ray
  • the value of ⁇ W may be 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20% or between them any value.
  • the value of ⁇ V can be -10%, -8%, -6%, -4%, -2%, 0, 2%, 4%, 6%, 8%, 10% or any value between them.
  • the mass content of metal elements in the packaging film is less than 80%. In some embodiments of the present application, the mass content of the metal elements in the packaging film is less than 75%, less than 70%, less than 65%, less than 60%, less than 55%, less than 50%, less than 45%, less than 40%, Less than 35%, less than 30%, less than 25%, less than 20%, less than 15%, less than 10%, less than 5%, or less than 1%.
  • the bonding force between the packaging film and the surface of the electrode assembly is F, 3N/mm ⁇ F ⁇ 20N/mm.
  • the value of F can be 3N/mm, 5N/mm, 8N/mm, 10N/mm, 12N/mm, 15N/mm, 18N/mm, 20N/mm or between them any value.
  • the encapsulation film includes synthetic resin and optional inorganic particles.
  • the synthetic resin includes one or more of thermosetting resin or thermoplastic resin.
  • the thermosetting resin includes one or more of phenolic resin, epoxy resin, melamine resin, polyimide resin, polyester resin, acrylic resin, silicone resin or cross-linked polyolefin resin. kind.
  • the thermoplastic resin includes polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone or polyethylene terephthalate. one or more.
  • the inorganic particles include one or more of aluminum oxide, silicon oxide, or silica sol.
  • the particle size of the inorganic particles ranges from 0.04 ⁇ m to 100 ⁇ m. In some embodiments of the present application, the particle size of the inorganic particles is in a range of 0.04 ⁇ m, 1 ⁇ m, 5 ⁇ m, 10 ⁇ m, 20 ⁇ m, 40 ⁇ m, 60 ⁇ m, 80 ⁇ m, 100 ⁇ m, or any two of these values.
  • the encapsulation film is formed by applying a raw material liquid containing synthetic resin and optional inorganic particles to the surface of the electrode assembly.
  • coating includes one or more of spraying, scraping, dipping or brushing.
  • the coating and encapsulation method is used to integrally form the encapsulating film on the surface of the electrode assembly, and is chemically bonded to the tabs. There is no need to perform operations such as heat sealing or welding, thus saving space on the sealing edge. It can greatly improve the space utilization of electrochemical devices and increase their volumetric energy density.
  • the coating packaging method of the present application can also better meet the packaging requirements of special-shaped electrochemical devices.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separation film located between the positive electrode and the negative electrode.
  • the positive electrode includes a positive active material layer and a positive current collector.
  • the positive active material layer includes a positive active material, a binder, and a conductive agent.
  • the cathode active material may include lithium cobalt oxide, lithium nickel manganese cobalt oxide, lithium nickel manganese aluminate, lithium iron phosphate, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, lithium iron manganese phosphate, silicic acid At least one of lithium iron, lithium vanadium silicate, lithium cobalt silicate, lithium manganese silicate, spinel type lithium manganate, spinel type lithium nickel manganate and lithium titanate.
  • the binder may include various binder polymers, such as polyvinylidene fluoride, polytetrafluoroethylene, polyolefins, sodium carboxymethylcellulose, lithium carboxymethylcellulose, modified At least one of polyvinylidene fluoride, modified SBR rubber or polyurethane.
  • any conductive material can be used as the conductive agent as long as it does not cause chemical changes.
  • conductive agents include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, etc.; metal-based materials, such as metal powder or metal fibers including copper, nickel, aluminum, silver, etc. ; Conductive polymers, such as polyphenylene derivatives, etc.; or mixtures thereof.
  • the positive electrode current collector may be a metal foil or a composite current collector.
  • aluminum foil can be used.
  • the composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, etc.) on a polymer substrate.
  • the negative electrode includes a negative active material layer and a negative current collector.
  • the negative active material layer includes a negative active material, a binder, and a conductive agent.
  • the negative active material may include a material that reversibly intercalates/deintercalates lithium ions, lithium metal, lithium metal alloy, or transition metal oxide.
  • the negative active material includes at least one of carbon material or silicon material, the carbon material includes at least one of graphite and hard carbon, and the silicon material includes silicon, silicon oxy compound, silicon carbon compound or silicon alloy. of at least one.
  • the binder includes styrene-butadiene rubber, polyacrylic acid, polyacrylate, polyimide, polyamideimide, polyvinylidene fluoride, polyvinylidene fluoride, polytetrafluoroethylene, water-based acrylic resin , at least one of polyvinyl formal or styrene-acrylic acid copolymer resin.
  • any conductive material can be used as the conductive material as long as it does not cause chemical changes.
  • the conductive material includes at least one of conductive carbon black, acetylene black, carbon nanotubes, Ketjen black, conductive graphite, or graphene.
  • the negative electrode current collector may be copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a polymer substrate coated with conductive metal, or a combination thereof.
  • the isolation membrane used in the electrochemical device of the present application are not particularly limited, and it can be any technology disclosed in the prior art.
  • the isolation membrane includes polymers or inorganic substances formed of materials that are stable to the electrolyte of the present application.
  • the isolation film may include a base material layer and a surface treatment layer.
  • the base material layer is a non-woven fabric, film or composite film with a porous structure.
  • the base material layer is made of at least one material selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyimide.
  • polypropylene porous membrane, polyethylene porous membrane, polypropylene non-woven fabric, polyethylene non-woven fabric or polypropylene-polyethylene-polypropylene porous composite membrane can be used.
  • a surface treatment layer is provided on at least one surface of the base layer.
  • the surface treatment layer may be a polymer layer or an inorganic layer, or may be a layer formed by mixing a polymer and an inorganic layer.
  • the inorganic layer includes inorganic particles and a binder.
  • the inorganic particles are selected from aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, ceria, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, At least one of yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide and barium sulfate.
  • the binder is selected from polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyethylene alkoxy , at least one of polymethylmethacrylate, polytetrafluoroethylene and polyhexafluoropropylene.
  • the polymer layer contains a polymer, and the material of the polymer is selected from polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyethylene alkoxy, polyvinylidene fluoride, At least one of poly(vinylidene fluoride-hexafluoropropylene).
  • Electrolytes useful in this application may be electrolytes known in the art.
  • the electrolyte solution includes organic solvents, electrolyte salts, and optional additives.
  • the organic solvent of the electrolyte solution according to the present application may be any organic solvent known in the prior art that can be used as a solvent for the electrolyte solution.
  • the electrolyte used in the electrolyte solution according to the present application is not limited, and it can be any electrolyte known in the prior art.
  • the additives of the electrolyte according to the present application may be any additives known in the art that can be used as electrolyte additives.
  • organic solvents include, but are not limited to: ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC) ), propylene carbonate or ethyl propionate.
  • the organic solvent includes ether solvents, such as at least one of 1,3-dioxane (DOL) and ethylene glycol dimethyl ether (DME).
  • the electrolyte salt may be a lithium salt, a sodium salt, or the like.
  • the lithium salt includes at least one of an organic lithium salt or an inorganic lithium salt.
  • lithium salts include, but are not limited to: lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium difluorophosphate (LiPO 2 F 2 ), lithium bistrifluoromethanesulfonimide LiN (CF 3 SO 2 ) 2 (LiTFSI), lithium bis(fluorosulfonyl)imide Li(N(SO 2 F) 2 )(LiFSI), lithium bisoxalatoborate LiB(C 2 O 4 ) 2 (LiBOB) or Lithium difluorooxalate borate LiBF 2 (C 2 O 4 ) (LiDFOB).
  • LiPF 6 lithium hexafluorophosphate
  • LiBF 4 lithium tetrafluoroborate
  • LiPO 2 F 2 lithium difluorophosphate
  • LiN CF 3 SO 2 ) 2
  • LiTFSI lithium bistrifluoromethanesulfonimide LiN
  • sodium salts include, but are not limited to: NaClO 4 , NaPF 6 , NaBF 4 , Na(FSO 2 ) 2 N, Na(CF 3 SO 2 ) 2 N, Na(C 2 F 5 SO 2 ) At least one of 2 N, NaCF 3 SO 3 , NaSbF 6 , NaBC 4 O 8 , NaFSI, NaTFSI, lower aliphatic carboxylic acid sodium salt, NaAlCl 4 , NaPO 2 F 2 or Na 2 PO 3 F.
  • electrochemical devices of the present application include, but are not limited to: all types of primary batteries, secondary batteries, or capacitors.
  • the electrochemical device is a lithium secondary battery.
  • lithium secondary batteries include, but are not limited to: lithium metal secondary batteries, lithium ion secondary batteries, lithium polymer secondary batteries, or lithium ion polymer secondary batteries.
  • the electrochemical device is a sodium-ion battery.
  • the present application provides an electronic device, including an electrochemical device according to the second aspect of the present application.
  • electronic devices include, but are not limited to: notebook computers, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, and stereo headsets.
  • VCR VCR
  • LCD TV portable cleaner
  • portable CD player mini disc
  • transceiver electronic notepad
  • calculator memory card
  • portable recorder radio
  • backup power supply motor, automobile, motorcycle, power-assisted bicycle, bicycle , lighting equipment, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries or lithium-ion capacitors, etc.
  • the batteries in the examples and comparative examples were prepared according to the following methods:
  • these steps are also completed on the back of the electrode piece in a completely consistent manner, that is, a double-sided coated positive electrode piece is obtained.
  • the positive electrode sheet is cold-pressed to a compacted density of 4.1g/ cm3 , which completes the entire preparation process of the positive electrode sheet.
  • EC ethylene carbonate
  • EMC ethyl methyl carbonate
  • DEC diethyl carbonate
  • LiPF 6 lithium salt lithium hexafluorophosphate
  • PE polyethylene
  • the spraying pressure is 0.2MPa.
  • the specific raw materials used are shown in Tables 1 to 3.
  • the battery expansion test uses a spiral micrometer to measure the thickness.
  • the measurement position is the center of the battery and the battery status is 100% SOC.
  • the thickness before the start of the cycle is T1
  • the thickness after 100 cycles is T100
  • the expansion rate is (T100-T1)/T1 ⁇ 100%.
  • X-ray CT X-ray electronic computed tomography
  • model: GE Phoenix m300 X-ray electronic computed tomography
  • the scanned battery images are then calculated and synthesized using the software provided by the device.
  • the processed image can be used to cut any cross-section of the battery to obtain a synthesized X-ray CT cross-sectional image.
  • the lithium-ion battery is completely embedded in epoxy resin, and then the embedded battery is placed in a liquid nitrogen atmosphere, and the battery is subjected to brittle fracture treatment (the outermost part of the brittle fracture position of the battery does not contain tabs, and frozen ultra-thin sections are used)
  • brittle fracture treatment the outermost part of the brittle fracture position of the battery does not contain tabs, and frozen ultra-thin sections are used
  • the technology will smooth the cross section for better results), and transfer the sample from the packaging film area to the scanning electron microscope (SEM) cavity to obtain the sample for scanning electron microscopy analysis.
  • EDS X-ray energy spectroscopy
  • Comparative Example 1-1 which is a traditional aluminum-plastic film package for a soft-pack battery
  • Comparative Example 1-2 which is a laser welded package for a steel-shell battery
  • the packaging film on the outside of the electrode assembly is discontinuous, and there are obvious traces of melted packaging.
  • Examples 1-1 and 1-2 adopt the coating and packaging method of the present application.
  • the packaging film When observing the electrochemical device through X-ray CT, within the scope of the CT cross-sectional view that does not include the tabs or poles, the packaging film There are no obvious traces of welding and heat sealing in the middle, showing the characteristics of continuous closure, and the total content of metal elements is less than 80%.
  • the coating and packaging method of this application it is possible to significantly improve the battery while maintaining the cyclic expansion performance. energy density.
  • Example 2-1 and Example 2-2 selected maleic anhydride modified polypropylene thermosetting resin. Compared with Comparative Example 2 -1 is an epoxy resin and Comparative Example 2-2 is a polyester resin. The volume swelling rate is reduced by more than 10%, and the cycle performance of the battery is improved by 20% to 30%.
  • Table 3 shows the impact of packaging film materials on battery cycle performance.
  • Examples 3 and 4 are thermoplastic resins, and Examples 1 and 5 are thermosetting resins. The results show that thermosetting resin materials and thermoplastic resin materials have an impact on battery cycle performance. The performance impact was not significantly different.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
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Abstract

L'invention concerne un dispositif électrochimique, comprenant un ensemble électrode et un film de conditionnement conçu pour le conditionnement de l'ensemble électrode. Le film de conditionnement se trouve sous une forme fermée, le taux de gonflement en masse du film de conditionnement est ΔW, et le taux de gonflement en volume du film de conditionnement est ΔV, lesquelles variables satisfont aux conditions suivantes : 0 ≤ ΔW ≤ 20 % et -10 % ≤ ΔV ≤ 10 %. Le rapport volumique du film de conditionnement dans le dispositif électrochimique selon la présente demande est faible, la densité d'énergie volumique du dispositif électrochimique peut être augmentée, et le conditionnement d'un dispositif électrochimique de forme spéciale est satisfait.
PCT/CN2022/084457 2022-03-31 2022-03-31 Dispositif électrochimique et dispositif électronique comprenant celui-ci WO2023184361A1 (fr)

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PCT/CN2022/084457 WO2023184361A1 (fr) 2022-03-31 2022-03-31 Dispositif électrochimique et dispositif électronique comprenant celui-ci
CN202280090554.8A CN118591931A (zh) 2022-03-31 2022-03-31 电化学装置及含有该电化学装置的电子装置

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Citations (5)

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US20120135292A1 (en) * 2011-10-31 2012-05-31 Sakti3, Inc. Conformal solid state package method and device for a battery device
US20140147737A1 (en) * 2012-11-27 2014-05-29 Apple Inc. Battery Packaging
CN104953047A (zh) * 2014-03-28 2015-09-30 英特尔公司 用于在电池单元上提供密封化合物的方法
CN105390626A (zh) * 2014-08-22 2016-03-09 曼兹股份公司 用于为电池组电池制造外壳的方法
CN110809830A (zh) * 2017-06-29 2020-02-18 I-Ten公司 用于电子元件和电池的封装系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120135292A1 (en) * 2011-10-31 2012-05-31 Sakti3, Inc. Conformal solid state package method and device for a battery device
US20140147737A1 (en) * 2012-11-27 2014-05-29 Apple Inc. Battery Packaging
CN104953047A (zh) * 2014-03-28 2015-09-30 英特尔公司 用于在电池单元上提供密封化合物的方法
CN105390626A (zh) * 2014-08-22 2016-03-09 曼兹股份公司 用于为电池组电池制造外壳的方法
CN110809830A (zh) * 2017-06-29 2020-02-18 I-Ten公司 用于电子元件和电池的封装系统

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