WO2023184142A1 - Dispositif électrochimique et dispositif électronique - Google Patents

Dispositif électrochimique et dispositif électronique Download PDF

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Publication number
WO2023184142A1
WO2023184142A1 PCT/CN2022/083643 CN2022083643W WO2023184142A1 WO 2023184142 A1 WO2023184142 A1 WO 2023184142A1 CN 2022083643 W CN2022083643 W CN 2022083643W WO 2023184142 A1 WO2023184142 A1 WO 2023184142A1
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WO
WIPO (PCT)
Prior art keywords
electrochemical device
housing
isolator
sealing
sealing part
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PCT/CN2022/083643
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English (en)
Chinese (zh)
Inventor
刘道林
林森
何平
Original Assignee
宁德新能源科技有限公司
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Priority to PCT/CN2022/083643 priority Critical patent/WO2023184142A1/fr
Publication of WO2023184142A1 publication Critical patent/WO2023184142A1/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
    • H01M50/183—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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof

Definitions

  • the present application relates to the field of electrochemistry, and in particular to an electrochemical device and an electronic device.
  • the series/parallel battery in the same bag includes a casing and multiple electrode assemblies arranged in the same casing.
  • the series-connected electrode assemblies need to be separated by separators to avoid high voltage.
  • the electrolyte decomposes under voltage, and parallel electrode assemblies are separated by separators to avoid mutual interference.
  • the inventor of this application found through research that when the sealing part of the series/parallel battery pack is bent due to impact, or when the sealing part is folded, it will inevitably cause pulling on the internal separator, thus causing the sealing part to The probability of failure is higher.
  • the present application provides an electrochemical device and an electronic device to improve the structural reliability of the sealing part of series/parallel batteries in the same bag.
  • the first aspect of this application provides an electrochemical device.
  • the electrochemical device includes a first housing, a second housing, and a separator between the first housing and the second housing.
  • the electrochemical device includes a first sealing part, the first housing includes a first sealing area located in the first sealing part, the second housing includes a second sealing area located in the first sealing part, the isolation member includes a first sealing area located in the first sealing area and The first area between the second seal areas.
  • the bonding strength between the first sealing area and the first area is F N/mm
  • the tensile strength of the spacer is f N/mm
  • the stretch rate of the spacer is S, satisfying F/(f ⁇ S) ⁇ 15.
  • the separator when the first sealing part is bent or folded under impact, on the one hand, the separator itself has sufficient tensile strength and ductility to bend the bending part. The stress and strain are buffered. At the same time, the bonding strength between the isolator and the shell can withstand the stress at the bend, thereby avoiding the occurrence of rupture, making the first sealing part have excellent structural reliability.
  • F/(f ⁇ S) ⁇ 10 the tensile strength and ductility of the isolator itself can better buffer the stress and strain at the bend.
  • F/(f ⁇ S) ⁇ 1 the bonding strength between the isolator and the shell can better withstand the stress at the bend, thereby further improving the structural reliability of the first sealing part.
  • F F ⁇ 1.
  • the isolator and the casing have good bonding strength, which can further suppress the risk of separation between the isolator and the casing, and improve the structural reliability of the first sealing part.
  • f f ⁇ 1.
  • the isolator itself has good structural strength and can inhibit its own rupture when it is bent and pulled by the first sealing part, thereby improving the structural reliability of the first sealing part.
  • the isolator itself has better ductility and can better buffer the strain when the first sealing part is bent, thereby reducing the risk of rupture of the isolator itself and the connection between the isolator and the housing, and improving the strength of the first sealing part. Structural reliability.
  • the number of spacers is n, n ⁇ 1, and the electrochemical device satisfies f ⁇ (1+0.1n). In some embodiments, the electrochemical device satisfies S ⁇ (8+n)%.
  • the greater the number of spacers the greater the bending and pulling stress and strain experienced by the spacers when the first sealing part is bent. By satisfying the above relationship through f and/or S, the spacer itself can further improve its tolerance to bending and pulling. , thereby improving the structural reliability of the first sealing part.
  • the thickness of the spacer is Hmm, satisfying H ⁇ 0.3.
  • the first sealing portion includes a first bending portion.
  • the length of the first sealing part is L, and along the length direction of the first sealing part, the coefficient of variation CV of the thickness at both ends and the middle L/2 of the first sealing part is ⁇ 5%.
  • the first housing further includes a first body part
  • the first bending part includes a first flanging part and a second flanging part
  • the first flanging part is connected to the first body through the second flanging part. parts are connected, and the first flanging part is located between the first main body part and the second flanging part.
  • the electrochemical device further includes a first electrode assembly and a second electrode assembly, the electrochemical device is provided with a first cavity between the first housing and the separator, and the electrochemical device is provided between the second housing and the separator. A second cavity is provided between the isolation members.
  • the first electrode assembly is located in the first cavity, and the second electrode assembly is located in the second cavity. The first electrode assembly and the second electrode assembly are connected in series.
  • the isolator includes a first encapsulation layer, an intermediate layer and a second encapsulation layer.
  • the intermediate layer is located between the first encapsulation layer and the second encapsulation layer.
  • the material of the first encapsulation layer and the second encapsulation layer includes the third encapsulation layer.
  • the material of the middle layer includes at least one of a metal material, a second polymer material, or a carbon material.
  • the first polymer material includes polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene propylene copolymer, polyvinyl chloride, polystyrene, polyethernitrile, polyurethane, polyamide, polyester, non- Crystalline ⁇ -olefin copolymer or at least one of the derivatives of the above substances.
  • the metallic materials include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb , Pb, In, Zn, stainless steel (SUS) and at least one of its compositions or alloys.
  • the second polymer material includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide , polyamide, polyethylene glycol, polyamide-imide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride , polypropylene carbonate, poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride modified polypropylene, poly At least one of ethylene, ethylene propylene copolymer, polyvinyl chloride, polystyrene, polyethernitrile, polyurethane, polyphenylene ether, polyester, polysulfone, a
  • the carbon material includes at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film, or graphene film.
  • a second aspect of the present application also provides an electronic device, including any of the above electrochemical devices.
  • the electrochemical device provided by this application satisfies F/( f ⁇ S) ⁇ 15, when the first sealing part is bent or folded under impact, on the one hand, the separator itself has sufficient tensile strength and ductility to reduce the stress and stress at the bending part.
  • the strain is buffered, and at the same time, the bonding strength between the isolator and the shell can withstand the stress at the bend, thereby avoiding the occurrence of rupture, making the first sealing part have excellent structural reliability.
  • Figure 1 is a schematic side view from a first perspective of a battery provided by an embodiment of the present application; wherein, the first sealing portion is to be bent;
  • Figure 2 is a schematic side view of a battery from a second perspective according to an embodiment of the present application; wherein the first sealing portion is to be bent;
  • FIG 3 is an exploded schematic diagram of a battery provided by an embodiment of the present application from a first perspective; wherein, the battery has an isolator;
  • FIG. 4 is an exploded schematic diagram of a battery provided by another embodiment of the present application from a first perspective; wherein, the battery has two isolators;
  • Figure 5 is a schematic side view of the isolator provided by an embodiment of the present application from a first perspective
  • FIG. 6 is a schematic side view of the isolator provided by an embodiment of the present application from a second perspective.
  • the inventor of this application found through research that the separators in the same-bag series/parallel batteries need to be packaged together with the surroundings of the upper and lower casings, because the introduction of separators into the packaging area poses challenges to the packaging strength and sealing performance.
  • the separator itself needs to ensure that it is not torn.
  • it is necessary to prevent the separator from being broken.
  • the thickness of the packaging area increases, which increases the risk of cracking and failure after the packaging area is bent.
  • the electrochemical device is a battery 10 as an example.
  • the battery 10 includes a first case 200 , a second case 300 , and a separator 100 located between the first case 200 and the second case 300 .
  • Battery 10 may also include two or more electrode assemblies.
  • the spacer 100 separates the space enclosed by the first housing 200 and the second housing 300 into two independent spaces, and the number of electrode assemblies can be two.
  • the two electrode assemblies are arranged in one-to-one correspondence in the above-mentioned two mutually independent spaces. Referring to FIG.
  • the spacers 100 divide the space enclosed by the first housing 200 and the second housing 300 into three mutually independent spaces, and the number of electrode assemblies can be Three, and the three electrode assemblies are arranged in one-to-one correspondence in the above three independent spaces. And so on.
  • the following description takes as an example that the number of separators 100 is one and the number of electrode assemblies is two.
  • the number of isolators 100 is one, one side of the isolator 100 is connected to the first housing 200 and the other side is connected to the second housing 300 .
  • the battery 10 is connected to each other through the first casing 200 , the separator 100 and the periphery of the second casing 300 , for example, by hot melting or gluing, to achieve sealing of the battery 10 and prevent the electrolyte in the battery 10 from being exposed.
  • the shape of the sealing area depends on the shape of the battery 10. In one embodiment, when the battery 10 is a square battery 10, as shown in FIG. 5, the shape of the sealing area may be a rectangular ring and include four sealing edges.
  • the sealing edge is named the first sealing portion 600 .
  • the tabs 410 of the electrode assembly need to protrude from the sealing edge of the battery 10.
  • the tabs 410 can protrude from the first sealing portion 600 or other sealing edges.
  • the first housing 200 includes a first sealing area 610 located in the first sealing portion 600
  • the second housing 300 includes a second sealing area 630 located in the first sealing portion 600
  • the isolation member 100 includes a first sealing area 610 and a second sealing area 630 located in the first sealing portion 600 .
  • the first area 620 between the two sealing areas 630 is shown in FIG. 5 , where the first area 620 is located in the area between the outer edge of the solid line and the dotted line.
  • the number of the spacers 100 is one, one side of the first area 620 of the spacer 100 is connected to the first sealing area 610 and the other side is connected to the second sealing area 630 .
  • the isolator 100 in this embodiment is the isolator 100 in contact with the first sealing area 610. At this time, the isolator 100 is in contact with the second sealing area through other isolators 800. 630 indirect connection.
  • the bonding strength F N/mm between the first sealing area 610 and the first area 620, the tensile strength f N/mm of the spacer 100, and the stretch rate S of the spacer 100 satisfy F/( f ⁇ S) ⁇ 15.
  • F/(f ⁇ S) can specifically be 15, 13, 11, 9, 7, 5 or 3, etc.
  • the specific definitions and test methods of the bonding strength F N/mm, the tensile strength f N/mm of the isolator 100, and the tensile ratio S of the isolator 100 are detailed below.
  • the inventor of this application considered that in order to ensure that the first sealing part 600 is not prone to failure after bending, it is necessary to comprehensively consider the bonding strength FN/mm between the isolator 100 and the housing, and the tensile strength fN/mm of the isolator 100. mm and the stretch rate S of the separator 100, F, f and S satisfy the above relationship.
  • the separator 100 It has sufficient tensile strength and ductility to buffer the stress and strain at the bends.
  • the bonding strength between the isolator 100 and the shell can withstand the stress at the bends, thereby avoiding rupture. , so that the first sealing part 600 has excellent structural reliability.
  • battery 10 may satisfy 1 ⁇ F/(f ⁇ S) ⁇ 10.
  • F/(f ⁇ S) ⁇ 10 the tensile strength and ductility of the isolator 100 can better buffer the stress and strain at the bend.
  • the bonding strength between the isolator 100 and the housing can better withstand the stress at the bend, thereby further improving the structural reliability of the first sealing part 600 .
  • F F ⁇ 1 N/mm.
  • the isolator 100 and the casing have good bonding strength, which can further suppress the risk of separation of the isolator 100 and the casing, and improve the structural reliability of the first sealing part 600 .
  • f f ⁇ 1N/mm.
  • the isolator 100 itself has good structural strength and can restrain itself from breaking when it is bent and pulled by the first sealing part 600 , thereby improving the structural reliability of the first sealing part 600 .
  • the isolator 100 itself has good ductility and can better buffer the strain when the first sealing part 600 is bent, thereby reducing the risk of rupture of the isolator 100 itself and the connection between the isolator 100 and the housing, and improving the efficiency of the second sealing part 600. A structural reliability of the sealing part 600.
  • the number of spacers 100 has an impact on the structural reliability of the first sealing part 600.
  • the inventor of the present application found that the greater the number of spacers, the tensile stress and strain on the spacer 100 will increase accordingly when the first sealing part 600 is bent. By satisfying the above relationship by f and/or S, the isolation can be further improved.
  • the part 100 can withstand pulling, thus improving the structural reliability of the first sealing part 600 .
  • the thickness H of the spacer 100 satisfies H ⁇ 0.3mm.
  • the first sealing part 600 includes a first bending part 640, that is, the first sealing part 600 is bent at least once.
  • the length of the first sealing portion 600 is L, and along the length direction of the first sealing portion 600 , the coefficient of variation CV of the thickness at both ends and the middle L/2 of the first sealing portion 600 is ⁇ 5%.
  • three data were measured: the thickness at both ends of the first sealing part 600 and the thickness at the middle position of the first sealing part 600, and then the standard deviation and average value of the three were calculated. The difference between the standard deviation and the average value was calculated. The ratio is the coefficient of variation CV. In this embodiment, the coefficient of variation CV is controlled to ⁇ 5%.
  • the first housing 200 further includes a first main body portion 11 , which is a portion of the first housing 200 that is recessed to form a cavity for accommodating the electrode assembly.
  • the first bending portion 640 includes The first flanging portion 641 and the second flanging portion 642 are connected to the first main body portion 11 through the second flanging portion 642, and the first flanging portion 641 is located between the first main body portion 11 and the first flanging portion 642. between the two folded edge portions 642.
  • the first flanging part 641 is bent toward the first main body part 11 relative to the second flanging part 642.
  • the first flanging part 641 can be bent to The second flanging portion 642 is stacked and arranged, and the interface between the first flanging portion 641 and the second flanging portion 642 is the folding surface.
  • the first bending part 640 can also be bent twice, that is, after the first bending part 641 is bent relative to the second bending part 642, the second bending part 642 is also bent toward the second bending part 642.
  • a main body part 11 is bent, specifically, it can be bent until the first flanging part 641 is in contact with the wall surface of the first main body part 11 facing the first bending part 640 .
  • the first flanging part 641 can provide a buffering and supporting effect, inhibit excessive bending at the connection between the second flanging part 642 and the first main body part 11 , and reduce internal isolation.
  • the pulling of the parts improves the structural reliability of the first sealing part 600.
  • the electrochemical device further includes a first electrode assembly 400 and a second electrode assembly 500 .
  • a first cavity and a second cavity are provided on both sides of the separator 100 .
  • the first electrode assembly 400 is provided with In the first cavity, the second electrode assembly 500 is provided in the second cavity, and the first electrode assembly 400 and the second electrode assembly 500 are connected in series.
  • the isolator 100 includes a first encapsulation layer 120 , an intermediate layer 110 and a second encapsulation layer 130 .
  • the intermediate layer 110 is located between the first encapsulation layer 120 and the second encapsulation layer 130 .
  • the first The material of the encapsulation layer 120 and the second encapsulation layer 130 includes the first polymer material.
  • the material of the middle layer 110 includes at least one of a metal material, a second polymer material, or a carbon material.
  • the separator 100 can be electronically insulating or electronically conductive. Two sides of the separator 100 form independent sealed chambers. Each sealed chamber contains an electrode assembly and an electrolyte to form an electrochemical unit. Wherein, both sides of the separator 100 are in direct contact with the separator of the adjacent electrode assembly and form electrical insulation. At this time, each of the two electrode assemblies leads to at least two tabs 410, and the two electrode assemblies are connected in series or in parallel through the tabs 410.
  • the first polymer material includes polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene propylene copolymer, polyvinyl chloride, polystyrene, polyethernitrile, polyurethane, polyamide, polyester, non- Crystalline ⁇ -olefin copolymer or at least one of the derivatives of the above substances.
  • Metal materials include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In, Zn , stainless steel (SUS) and at least one of its compositions or alloys.
  • the second polymer material includes polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyether ether ketone, polyimide, polyamide, polyethylene Glycol, polyamide-imide, polycarbonate, cyclic polyolefin, polyphenylene sulfide, polyvinyl acetate, polytetrafluoroethylene, polymethylene naphthalene, polyvinylidene fluoride, polypropylene carbonate , poly(vinylidene fluoride-hexafluoropropylene), poly(vinylidene fluoride-co-chlorotrifluoroethylene), silicone, vinylon, polypropylene, acid anhydride modified polypropylene, polyethylene, ethylene propylene copolymer , polyvinyl chloride, polystyrene, polyethernitrile, polyurethane, polyphenylene ether, polyester, polysulfone, amorphous ⁇ -olef
  • the carbon material includes at least one of carbon felt, carbon film, carbon black, acetylene black, fullerene, conductive graphite film or graphene film.
  • a second aspect of the present application also provides an electronic device, which includes the electrochemical device in any of the above embodiments.
  • the electrode assembly of the present application is not particularly limited. Any electrode assembly in the prior art can be used as long as the purpose of the present application can be achieved. For example, a laminated electrode assembly or a wound electrode assembly can be used.
  • the electrode assembly generally includes a positive electrode piece, a negative electrode piece and a separator.
  • a negative electrode plate typically includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode current collector is not particularly limited, and any negative electrode current collector known in the art can be used, such as copper foil, aluminum foil, aluminum alloy foil, composite current collector, etc.
  • the negative active material layer includes a negative active material.
  • the negative active material is not particularly limited, and any negative active material known in the art can be used. For example, it may include at least one of artificial graphite, natural graphite, mesocarbon microspheres, soft carbon, hard carbon, silicon, silicon carbon, lithium titanate, and the like.
  • the positive electrode sheet in this application is not particularly limited, as long as it can achieve the purpose of this application.
  • the positive electrode plate typically includes a positive current collector and a positive active material.
  • the positive electrode current collector is not particularly limited and can be any positive electrode current collector known in the art, such as aluminum foil, aluminum alloy foil or composite current collector.
  • the positive active material is not particularly limited and can be any positive active material in the prior art.
  • the active material includes NCM811, NCM622, NCM523, NCM111, NCA, lithium iron phosphate, lithium cobalt oxide, lithium manganate, and ferromanganese phosphate. At least one of lithium or lithium titanate.
  • the electrolyte in this application is not particularly limited, and any electrolyte known in the art can be used, for example, it can be any one of gel state, solid state and liquid state.
  • the liquid electrolyte solution can include lithium salt and non-aqueous solvent.
  • lithium salt is not particularly limited, and any lithium salt known in the art can be used as long as the purpose of the present application can be achieved.
  • lithium salts may include 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 bis(fluorosulfonyl)borate LiB(C 2 O 4 ) 2 (LiBOB) or lithium difluoroxaloborate LiBF 2 ( At least one of C 2 O 4 ) (LiDFOB).
  • LiPF 6 can be used as the lithium salt.
  • the non-aqueous solvent is not particularly limited as long as it can achieve the purpose of the present application.
  • the non-aqueous solvent may include at least one of a carbonate compound, a carboxylate compound, an ether compound, a nitrile compound, or other organic solvents.
  • the carbonate compound may include diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylene propylene carbonate Ester (EPC), ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinyl ethylene carbonate (VEC), fluoroethylene carbonate (FEC), carbonic acid 1 ,2-difluoroethylene carbonate, 1,1-difluoroethylene carbonate, 1,1,2-trifluoroethylene carbonate, 1,1,2,2-tetrafluoroethylene carbonate, 1 carbonate -Fluoro-2-methylethylene carbonate, 1-fluoro-1-methylethylene carbonate, 1,2-difluoro-1-methylethylene carbonate, 1,1,2-trifluorocarbonate- At least one of 2-methylethylene ester or trifluoromethylethylene carbonate.
  • DEC diethyl carbonate
  • DMC dimethyl carbon
  • the separator in the present application is not particularly limited.
  • the separator includes a polymer or inorganic substance formed of a material that is stable to the electrolyte of the present application.
  • the separator should generally be ion conductive and electronically insulating.
  • the separator may include a substrate layer and a surface treatment layer.
  • the base material layer can be a non-woven fabric, film or composite film with a porous structure.
  • the material of the base material layer can be selected from at least one of polyethylene, polypropylene, polyethylene terephthalate and polyimide. kind.
  • a polypropylene porous film, a polyethylene porous film, a polypropylene nonwoven fabric, a polyethylene nonwoven fabric, or a polypropylene-polyethylene-polypropylene porous composite film may be used.
  • a surface treatment layer is provided on at least one surface of the base material 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 substance.
  • the inorganic layer includes inorganic particles and a binder.
  • the inorganic particles are not particularly limited.
  • they can be selected from aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium dioxide, tin oxide, ceria, and nickel oxide.
  • the binder is not particularly limited, and may be selected from the group consisting of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, and polyvinylidene.
  • polyvinylidene fluoride vinylidene fluoride-hexafluoropropylene copolymer
  • polyamide polyacrylonitrile
  • polyacrylate polyacrylic acid
  • polyacrylate polyvinylidene
  • rrolidone polyvinyl ether
  • polymethylmethacrylate polytetrafluoroethylene
  • polyhexafluoropropylene polyhexafluoropropylene.
  • the polymer layer contains a polymer, and the polymer material includes polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride or poly( At least one of vinylidene fluoride-hexafluoropropylene).
  • the cathode active material LiCoO 2 , conductive carbon black, and PVDF (polyvinylidene fluoride) at a mass ratio of 97.5:1.0:1.5 add NMP, and prepare a slurry with a solid content of 75%, and stir evenly.
  • the slurry is evenly coated on one surface of an aluminum foil with a thickness of 12 ⁇ m, and dried at 90°C to obtain a positive electrode sheet coated with a positive active material layer on one side with a coating thickness of 100 ⁇ m. Then repeat the above steps on the other surface of the foil.
  • the pole piece is cut into a size of 38mm ⁇ 58mm and the pole tab 410 is welded for use.
  • PE polyethylene
  • the punched aluminum plastic film i.e., the first shell 200 in the previous embodiment
  • a thickness of 90 ⁇ m in the assembly fixture, with the pit surface facing upward
  • an electrode assembly A in the pit
  • the isolation The member 100 is placed on the electrode assembly A, one side of the separator 100 is in contact with the diaphragm of the electrode assembly A, and external force is applied to compress it.
  • the electrolyte is injected into the two cavities of the above-mentioned assembled electrode assembly and then packaged.
  • the tabs 410 of the two electrode assemblies are led out of the outer packaging.
  • the positive tab 410 of electrode assembly A and the negative tab 410 of electrode assembly B are welded together. Together, series conduction between the two electrode components is achieved.
  • the intermediate layer is selected from PET (polyethylene terephthalate) with a thickness of 30 ⁇ m, and the thickness of the encapsulation layer PP is 20 ⁇ m.
  • the rest is the same as in Embodiment 1.
  • the intermediate layer is selected from PET (polyethylene terephthalate) with a thickness of 40 ⁇ m, and the rest is the same as Embodiment 1.
  • Embodiment 1 The difference from Embodiment 1 is that in the preparation of the spacer 100, the intermediate layer is selected from an Al layer with a thickness of 25 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 20 ⁇ m, and the thickness of the encapsulation layer PP is 24 ⁇ m.
  • the rest is the same as in Embodiment 1.
  • Embodiment 1 The difference from Embodiment 1 is that in the preparation of the spacer 100, the intermediate layer is selected from an Al layer with a thickness of 22 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 24 ⁇ m, the thickness of the encapsulation layer PP is 32 ⁇ m, and the others are the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 23 ⁇ m, the thickness of the encapsulation layer PP is 35 ⁇ m, and the others are the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 26 ⁇ m, the thickness of the encapsulation layer PP is 38 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 27 ⁇ m, the thickness of the encapsulation layer PP is 34 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 28 ⁇ m, and the thickness of the encapsulation layer PP is 32 ⁇ m.
  • the rest is the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 25 ⁇ m, the thickness of the encapsulation layer PP is 25 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 24 ⁇ m, the thickness of the encapsulation layer PP is 32 ⁇ m, and the rest is the same as Embodiment 1.
  • Embodiment 1 The difference from Embodiment 1 is that in the preparation of the spacer 100, the intermediate layer is selected from an Al layer with a thickness of 20 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 25 ⁇ m, the thickness of the encapsulation layer PP is 20 ⁇ m, and the rest is the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 14 ⁇ m, the thickness of the encapsulation layer PP is 22 ⁇ m, and the others are the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 20 ⁇ m, the thickness of the encapsulation layer PP is 30 ⁇ m, and the rest is the same as Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 12 ⁇ m, the thickness of the encapsulation layer PP is 20 ⁇ m, and the others are the same as in Embodiment 1.
  • the intermediate layer is selected from an Al layer with a thickness of 10 ⁇ m, the thickness of the encapsulation layer PP is 15 ⁇ m, and the others are the same as in Embodiment 1.
  • the first sealing portion 600 with a width W 1 can be cut out, and a multifunctional tensile tester can be used to clamp the first sealing portion 600 respectively.
  • the sealing part takes the boundary between the sealing part and the main body of the casing as the axis, and first bends toward the upper half of the side wall of the main body of the casing until the sealing part and the side wall The upper part of the piece fits together and is counted as one bend. Then bend it 180° in the opposite direction to fit the lower part of the side wall, which is recorded as a second bend. Repeat this process, the sealing part on one side is bent 100 times, and the sealing part on the other side is bent 200 times. Disassemble the battery and observe whether cracks appear at the connection between the isolators and the casing of the seals on both sides.
  • Table 1 shows the parameters of the spacers and the structural stability of the sealing part in each embodiment and comparative example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Sont divulgués dans la présente demande un dispositif électrochimique et un dispositif électronique. Le dispositif électrochimique comprend un premier boîtier, un second boîtier et un élément d'isolation situé entre le premier boîtier et le second boîtier. Le dispositif électrochimique comprend une première partie d'étanchéité, le premier boîtier comprend une première zone d'étanchéité située au niveau de la première partie d'étanchéité, le second boîtier comprend une seconde zone d'étanchéité située au niveau de la première partie d'étanchéité, et l'élément d'isolation comprend une première zone située entre la première zone d'étanchéité et la seconde zone d'étanchéité. En rendant la force de liaison F N/mm entre la première zone d'étanchéité et la première zone, la résistance à la traction f N/mm de l'élément d'isolation et le taux d'étirement S de l'élément d'isolation satisfont F/(f × S) ≤ 15, et la première partie d'étanchéité présente une excellente fiabilité structurale.
PCT/CN2022/083643 2022-03-29 2022-03-29 Dispositif électrochimique et dispositif électronique WO2023184142A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000123800A (ja) * 1998-10-15 2000-04-28 Showa Alum Corp 電池ケース用包材
JP2005022336A (ja) * 2003-07-04 2005-01-27 Showa Denko Packaging Co Ltd 成形性に優れた包装用材料及びそれを用いて成形された包装容器
JP2006269171A (ja) * 2005-03-23 2006-10-05 Hitachi Maxell Ltd 電気化学素子
JP2007294380A (ja) * 2006-03-31 2007-11-08 Dainippon Printing Co Ltd 電池用包装材料
CN111066170A (zh) * 2017-08-29 2020-04-24 积水化学工业株式会社 片材、二次电池和二次电池的制造方法
CN112002868A (zh) * 2020-09-08 2020-11-27 宁德新能源科技有限公司 一种电化学装置及电子装置
CN113921994A (zh) * 2021-09-30 2022-01-11 宁德新能源科技有限公司 电池及用电设备

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000123800A (ja) * 1998-10-15 2000-04-28 Showa Alum Corp 電池ケース用包材
JP2005022336A (ja) * 2003-07-04 2005-01-27 Showa Denko Packaging Co Ltd 成形性に優れた包装用材料及びそれを用いて成形された包装容器
JP2006269171A (ja) * 2005-03-23 2006-10-05 Hitachi Maxell Ltd 電気化学素子
JP2007294380A (ja) * 2006-03-31 2007-11-08 Dainippon Printing Co Ltd 電池用包装材料
CN111066170A (zh) * 2017-08-29 2020-04-24 积水化学工业株式会社 片材、二次电池和二次电池的制造方法
CN112002868A (zh) * 2020-09-08 2020-11-27 宁德新能源科技有限公司 一种电化学装置及电子装置
CN113921994A (zh) * 2021-09-30 2022-01-11 宁德新能源科技有限公司 电池及用电设备

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