WO2024031510A1 - Adhésif conducteur reliant une languette et un pôle, et batterie les contenant - Google Patents

Adhésif conducteur reliant une languette et un pôle, et batterie les contenant Download PDF

Info

Publication number
WO2024031510A1
WO2024031510A1 PCT/CN2022/111686 CN2022111686W WO2024031510A1 WO 2024031510 A1 WO2024031510 A1 WO 2024031510A1 CN 2022111686 W CN2022111686 W CN 2022111686W WO 2024031510 A1 WO2024031510 A1 WO 2024031510A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductive adhesive
negative electrode
optionally
conductive
weight
Prior art date
Application number
PCT/CN2022/111686
Other languages
English (en)
Chinese (zh)
Inventor
赵利亚
刘会会
王龙
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/111686 priority Critical patent/WO2024031510A1/fr
Publication of WO2024031510A1 publication Critical patent/WO2024031510A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells

Definitions

  • the present application relates to a conductive adhesive, which contains a thermoplastic resin, a conductive filler, a curing agent and optionally a diluent, wherein the conductive filler is a mixture of silver and at least two selected from specific conductive substances.
  • the present application also relates to a battery unit including tabs and poles connected by the conductive glue, a battery pack including the battery unit, and an electrical device.
  • the connection methods between the pole lug and the shell include: ultrasonic welding, laser welding, resistance hot melt welding, riveting, bolt connection, etc. Among them, ultrasonic welding, laser welding, and resistance hot melt welding can fuse the terminal lug and the terminal metal of the casing (also called "pole post").
  • This application was made in view of the above issues, and its purpose is to provide a conductive adhesive for connecting the tabs and poles of the battery, so as to solve the problem of insufficient electrical performance and increased safety risks caused by the connection of the tabs and poles of the battery. technical problem.
  • the first aspect of this application provides a conductive adhesive, which includes:
  • thermoplastic resin 14-78% by weight thermoplastic resin
  • the conductive filler is a mixture of Ag and at least two conductive substances selected from Cu, Al, Fe, Zn, Ni, carbon black and graphite.
  • the conductive adhesive of the present application contains a specific composition, especially a mixture of Ag and at least two other conductive substances as a conductive filler, and can be used to bond the tabs and poles of battery cells while ensuring sufficient bonding force. At the same time, the amount of Ag is greatly reduced, and the volume resistance of the resulting battery cell can be reduced, and/or the electrolyte resistance of the conductive adhesive can be improved.
  • the conductive filler is a mixture of Ag, Ni and Cu. Further, the conductive filler is a mixture obtained by mixing Ag, Ni and Cu powders in a weight ratio of 20-60:20-40:20-40; optionally, the weight ratio is 40-60:20- 30:20-30. By adjusting the relative content of each conductive substance in the mixture, the volume resistance of the resulting battery cell can be further reduced.
  • the thermoplastic organic resin is selected from one or more of epoxy resin, acrylic resin, phenolic resin, polyurethane, silicone, optionally epoxy resin.
  • the weight average molecular weight of the epoxy resin may be 10,0000-100,0000g/mol, optionally 20,0000-60,0000g/mol.
  • the curing agent is selected from the group consisting of dicyandiamide, triethanolamine, triethylamine, methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyl At least one of hexahydrophthalic anhydride and dodecylmaleic anhydride, optionally dicyandiamide.
  • the diluent is selected from at least one of acetone, ethyl acetate, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, optionally ethyl acetate .
  • the conductive adhesive further contains 0.1-1% by weight of initiator.
  • the initiator may be selected from azobisisobutyronitrile or azobisisoheptanitrile.
  • the conductive adhesive further contains 0.1-0.5 wt% antioxidant.
  • the antioxidant may be selected from carbodiimides and/or hindered phenols.
  • the viscosity of the conductive adhesive before curing is 5000-20000 mPa.s, optionally 8000-16000 mPa.s.
  • the conductive adhesive has a curing temperature of 50-120°C, optionally 60-80°C.
  • a second aspect of the present application provides a battery cell, which includes:
  • the battery core includes a cylindrical structure formed by winding a positive electrode piece, a negative electrode piece, and a separator.
  • the positive electrode piece is provided with a positive electrode tab
  • the negative electrode piece is provided with a negative electrode tab;
  • the housing includes a hollow cylindrical structure with openings at both ends.
  • the battery core is inserted into the housing.
  • Positive poles and negative poles are respectively provided at both ends of the housing.
  • the positive tabs and the The negative electrode tabs are respectively bonded to the positive electrode post and the negative electrode post through the conductive adhesive described in the first aspect of the application.
  • the positive electrode tab and the negative electrode tab of the battery cell are full tabs.
  • the material of the positive electrode current collector and the positive electrode tab is aluminum foil, and the material of the negative electrode piece and the negative electrode tab is copper foil.
  • a third aspect of the present application provides a battery pack including a battery cell selected from the second aspect of the present application.
  • a fourth aspect of the present application provides an electrical device, which includes a battery cell selected from the second aspect of the present application or a battery pack of the third aspect of the present application.
  • Figure 1 is a schematic diagram of using conductive glue to bond pole tabs and pole posts in one embodiment of the present application.
  • 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.
  • the basic structure is the cell and the casing.
  • the battery core includes a positive electrode piece, a separator, and a cylinder formed by winding the negative electrode piece.
  • the positive electrode piece is provided with a positive electrode tab
  • the negative electrode piece is provided with a negative electrode tab.
  • the casing includes a hollow cylindrical structure with openings at both ends.
  • the battery core is inserted into the casing.
  • the two ends of the casing are respectively provided with positive poles and negative poles.
  • the positive poles and the negative poles are The pole tabs are respectively connected to the positive pole and the negative pole.
  • the connection is achieved by ultrasonic welding, laser welding, resistance heat welding, riveting, bolt connection, etc.
  • a conductive adhesive which includes:
  • thermoplastic organic resin 14-78% by weight thermoplastic organic resin
  • the conductive filler is a mixture of Ag and at least two conductive substances selected from Cu, Al, Fe, Zn, Ni, carbon black and graphite.
  • the conductive glue with a specific composition can significantly reduce the usage of precious metals such as silver powder while achieving effective bonding performance, and/ Or significantly reduce the volume resistance of the connection, and/or improve the electrolyte resistance of the conductive adhesive.
  • the conductive adhesive of the present application contains a specific proportion of components, especially a mixture of Ag and at least two conductive substances selected from Cu, Al, Fe, Zn, Ni, carbon black and graphite as a conductive filler.
  • the weight proportion of Ag in the conductive filler of the conductive adhesive, can be as low as 60% by weight or less, or even less than 50% by weight; optionally 20-60% by weight, further optionally 40% - 60% by weight, based on the total weight of the conductive filler.
  • the conductive filler is a mixture of Ag, Ni, and Cu. Further, the conductive filler is a mixture obtained by mixing Ag, Ni and Cu powders in a weight ratio of 20-60:20-40:20-40; optionally, the weight ratio is 40-60:20- 30:20-30; specifically, the weight ratio is 50:25:25.
  • the inventor found that selecting the powders of the above three metals and forming a mixture in a certain ratio can significantly reduce the volume resistance of the resulting battery cell. Under certain circumstances, the volume resistance can even be reduced by an order of magnitude compared to pure Ag powder, while the swelling and dissolution of the resulting conductive adhesive in the electrolyte is greatly reduced, indicating that its compatibility with the electrolyte has been significantly improved.
  • the particle size of the metal powder can be 10-100 ⁇ m, optionally 10-40 ⁇ m, or can be outside the above range, which has no obvious impact on the conductive adhesive of the present application.
  • the thermoplastic organic resin is selected from one or more of epoxy resin, acrylic resin, phenolic resin, polyurethane, and silicone, optionally epoxy resin.
  • epoxy resin you can choose any commercially available epoxy resin, such as bisphenol A-type epoxy resin or bisphenol F-type epoxy resin.
  • the weight average molecular weight Mw of the epoxy resin may be 10,0000-100,0000g/mol, optionally 20,0000-60,0000g/mol.
  • the inventor found that compared with other organic resins, choosing epoxy resin as the resin base material of the conductive adhesive of the present application can significantly improve the adhesive force of the conductive adhesive to the tab and the compatibility with the electrolyte.
  • the thermoplastic organic resin can vary within a wide range, optionally 15-40% by weight, further optionally 18-30% by weight, based on the total weight of the conductive adhesive.
  • the conductive adhesive of the present application contains 0.3-5% by weight of curing agent, optionally 0.5-1% by weight, based on the total weight of the conductive adhesive.
  • the curing agent is selected from the group consisting of triethanolamine, triethylamine, methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, and decahydrophthalic anhydride. At least one of dialkyl maleic anhydrides, optionally triethanolamine.
  • the curing agent is intended to cure the thermoplastic organic resin in the conductive adhesive after application.
  • the type of curing agent can be selected so that the organic resin does not solidify at room temperature, but only undergoes a substantial curing reaction at a higher temperature when heated.
  • the conductive adhesive can also be stored in a low-temperature container, taken out when used, and allowed to solidify at room temperature or higher.
  • the conductive adhesive has a curing temperature of 40-90°C, optionally 60-80°C.
  • the conductive adhesive may be in a single-component or two-component form. However, for ease of use, conductive adhesives are often formulated as one-component forms.
  • the conductive adhesive of the present application contains 0-20% by weight of diluent, optionally 1-10% by weight, based on the total weight of the conductive adhesive.
  • the diluent is selected from at least one of acetone, ethyl acetate, 1,4-butanediol diglycidyl ether, and ethylene glycol diglycidyl ether, optionally acetone.
  • the conductive glue includes any diluent.
  • the diluent is an inert organic solvent that is the active ingredient in the conductive adhesive to reduce the viscosity of the conductive adhesive and make it easier to apply to the bonding site.
  • the viscosity of the conductive glue before curing may be 5000-20000 mPa.s, optionally 8000-16000 mPa.s.
  • the conductive adhesive of the present application can be applied more conveniently. If the viscosity is too high, it will be difficult to cover the areas that need to be bonded with the conductive adhesive; if the viscosity is too low, the conductive adhesive will easily spread to other areas during application, affecting other structures of the battery.
  • the conductive adhesive further contains 0.1-1% by weight of initiator.
  • the initiator may be selected from azobisisobutyronitrile (AIBN) or azobisisoheptanitrile (ABVN).
  • AIBN azobisisobutyronitrile
  • ABSVN azobisisoheptanitrile
  • the conductive adhesive further contains 0.1-0.5 wt% antioxidant.
  • the antioxidant may be selected from carbodiimides and/or hindered phenols.
  • the conductive adhesive may also include a curing accelerator, such as 2-ethyl-4-methylimidazole.
  • a second aspect of the present application provides a battery cell, which includes:
  • the battery core includes a cylindrical structure formed by winding a positive electrode piece, a negative electrode piece, and a separator.
  • the positive electrode piece is provided with a positive electrode tab
  • the negative electrode piece is provided with a negative electrode tab;
  • the housing includes a hollow cylindrical structure with openings at both ends.
  • the battery core is inserted into the housing.
  • Positive poles and negative poles are respectively provided at both ends of the housing.
  • the positive tabs and the The negative electrode tabs are respectively bonded to the positive electrode post and the negative electrode post through the conductive adhesive described in the first aspect of the application.
  • the conductive adhesive described in the first aspect of the present application has good electrical conductivity and can form a good electrical connection between the tabs and poles bonded by it, showing sufficient adhesive force and low volume resistance. .
  • the thermal expansion characteristics of the organic resin in the conductive adhesive are used to cut off the connection path between the tab and the pole when the internal temperature of the battery cell is too high, thereby increasing the safety of the battery.
  • both the positive electrode tab and the negative electrode tab of the battery cell are full tabs.
  • each positive electrode tab can be conductively bonded to the corresponding positive electrode post, or each negative electrode tab can be conductively bonded to the corresponding negative electrode post. , making the conductivity between each tab and pole more uniform, thereby reducing the volume resistance.
  • the material of the positive electrode piece and the positive electrode tab is aluminum, and the material of the negative electrode piece and the negative electrode tab is copper.
  • a third aspect of the present application provides a battery pack including a battery cell selected from the second aspect of the present application.
  • a fourth aspect of the present application provides an electrical device, which includes a battery cell selected from the second aspect of the present application or a battery pack of the third aspect of the present application.
  • the materials of each component of the battery cell of the present application can be selected within a wide range.
  • the battery cell is specifically a lithium ion secondary battery.
  • the battery cells of the lithium ion secondary battery will be described in detail below.
  • a lithium-ion secondary battery typically includes a positive electrode plate, a negative electrode plate, a separator and an electrolyte.
  • active ions are inserted and detached back and forth between the positive and negative electrodes.
  • the isolation film is arranged between the positive electrode piece and the negative electrode piece to play the role of isolation.
  • the electrolyte plays a role in conducting ions between the positive and negative electrodes.
  • the electrolyte plays a role in conducting ions between the positive and negative electrodes.
  • the electrolyte includes organic solvents, lithium salts and additives.
  • the electrolyte salt can be a commonly used electrolyte salt in lithium ion secondary batteries, such as lithium salt, including the above-mentioned lithium salt as a high thermal stability salt, a lithium salt as a low resistance additive, or lithium that inhibits aluminum foil corrosion. Salt.
  • the electrolyte salt may be selected from lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium hexafluoroarsenate (LiAsF 6 ), lithium bisfluorosulfonyl imide (LiFSI), bistrifluoromethanesulfonyl Lithium imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluoromethanesulfonate borate (LiDFOB), lithium difluorophosphate (LiPO 2 F 2 ), lithium difluorodioxalate phosphate (LiDFOP), fluorosulfonic acid Lithium (LiSO 3 F), difluorodioxalate (NDFOP), Li 2 F(SO 2 N) 2 SO 2 F, KFSI, CsFSI, Ba(FSI) 2 and LiFSO 2 NSO 2 CH 2 CH 2 CH 2 CH 2
  • the solvent is a non-aqueous solvent.
  • the solvent may include one or more of chain carbonate, cyclic carbonate, and carboxylic acid ester.
  • the solvent may be selected from ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), Dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate Ester (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB) , one of ethyl
  • additives may include negative electrode film-forming additives, positive electrode film-forming additives, and may also include additives that can improve certain properties of the battery, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and battery low-temperature performance. additives, etc.
  • the additive is selected from the group consisting of unsaturated bond-containing cyclic carbonate compounds, halogen-substituted cyclic carbonate compounds, sulfate compounds, sulfite compounds, sultone compounds, disulfonic acid compounds, nitrile compounds, aromatic compounds At least one of a compound, an isocyanate compound, a phosphazene compound, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate compound, and a carboxylate compound.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.
  • the positive electrode active material layer includes a positive electrode active material and a conductive agent.
  • the positive electrode current collector has two surfaces facing each other in its own thickness direction, and the positive electrode active material layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.
  • the positive electrode current collector can be a metal foil or a composite current collector.
  • the metal foil aluminum foil can be used.
  • the composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer.
  • the composite current collector can be formed by forming metal materials (such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver and silver alloys, etc.) on polymer material substrates (such as polypropylene (PP), polyterephthalene). Formed on substrates such as ethylene formate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).
  • the positive active material layer disposed on the surface of the positive current collector includes a positive active material.
  • the positive active material used in the present application may have any conventional positive active material used in secondary batteries.
  • the cathode active material may include one or more selected from the group consisting of lithium transition metal oxides, lithium-containing phosphates with an olivine structure, and their respective modified compounds.
  • lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide One or more of lithium nickel cobalt aluminum oxide and its modified compounds.
  • lithium-containing phosphates with an olivine structure may include, but are not limited to, lithium iron phosphate, composites of lithium iron phosphate and carbon, lithium manganese phosphate, composites of lithium manganese phosphate and carbon, lithium iron manganese phosphate, lithium iron manganese phosphate
  • the positive active material may be coated with carbon on its surface.
  • the positive active material layer optionally includes a conductive agent.
  • a conductive agent used for the cathode material may be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers.
  • the positive active material layer also includes a water-based binder.
  • the water-based adhesive may be selected from one or more types of soluble polysaccharides and their derivatives and water-soluble or water-dispersible polymers.
  • the water-based binder may be methylcellulose and its salts, xanthan gum and its salts, chitosan and its salts, alginic acid and its salts; and polyethyleneimine and its salts , polyacrylamide, acrylic acid copolymers and their derivatives.
  • the water-based adhesive is a compound of xanthan gum and acrylic acid copolymer, and the weight ratio of the compound is 2:1-0.2:2.8.
  • the positive electrode piece can be prepared according to methods known in the art.
  • the carbon-coated cathode active material, conductive agent and aqueous binder can be dispersed in a solvent (such as water) to form a uniform cathode slurry; the cathode slurry is coated on the cathode current collector and dried. After drying, cold pressing and other processes, the positive electrode piece is obtained.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode material layer disposed on at least one surface of the negative electrode current collector, where the negative electrode material layer includes a negative electrode active material.
  • the negative electrode current collector has two surfaces opposite in its own thickness direction, and the negative electrode material layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.
  • the negative electrode current collector can be a metal foil or a composite current collector.
  • the metal foil copper foil can be used.
  • the composite current collector may include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base material.
  • the composite current collector can be formed by forming metal materials (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene (PP), polyterephthalene). Formed on substrates such as ethylene formate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).
  • the negative electrode material layer usually contains a negative electrode active material and an optional binder, an optional conductive agent and other optional auxiliaries, and is usually formed by coating and drying the negative electrode slurry.
  • Negative electrode slurry coating is usually formed by dispersing the negative electrode active material and optional conductive agent and binder in a solvent and stirring evenly.
  • the solvent can be N-methylpyrrolidone (NMP) or deionized water.
  • the specific type of negative electrode active material is not limited. Active materials known in the art that can be used in the negative electrode of lithium ion secondary batteries can be used, and those skilled in the art can select according to actual needs.
  • the negative active material may be selected from one or more of graphite, soft carbon, hard carbon, mesocarbon microspheres, carbon fibers, carbon nanotubes, elemental silicon, silicon oxide compounds, silicon carbon composites, and lithium titanate. kind.
  • the conductive agent may be selected from one or more types of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers.
  • the binder may be selected from styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), One or more of polymethacrylic acid (PMAA) and carboxymethyl chitosan (CMCS).
  • SBR styrene-butadiene rubber
  • PAA polyacrylic acid
  • PAAS sodium polyacrylate
  • PAM polyacrylamide
  • PVA polyvinyl alcohol
  • SA sodium alginate
  • PMAA polymethacrylic acid
  • CMCS carboxymethyl chitosan
  • auxiliaries are, for example, thickeners (such as sodium carboxymethyl cellulose (CMC-Na)).
  • Lithium-ion secondary batteries using an electrolyte also include a separator.
  • the isolation film is arranged between the positive electrode piece and the negative electrode piece to play the role of isolation.
  • the type of isolation membrane in this application. Any well-known porous structure isolation membrane with good chemical stability and mechanical stability can be used.
  • the material of the isolation membrane can be selected from at least one type selected from the group consisting of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.
  • the isolation film can be a single-layer film or a multi-layer composite film, with no special restrictions. When the isolation film is a multi-layer composite film, the materials of each layer can be the same or different, and there is no particular limitation.
  • the positive electrode piece, the negative electrode piece and the separator film can be made into an electrode assembly through a winding process or a lamination process.
  • the secondary battery may include an outer packaging.
  • the outer packaging can be used to package the above-mentioned electrode assembly and electrolyte.
  • the outer packaging of the secondary battery may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc.
  • the outer packaging of the secondary battery may also be a soft bag, such as a bag-type soft bag.
  • the material of the soft bag may be plastic. Examples of plastics include polypropylene (PP), polybutylene terephthalate (PBT), and polybutylene succinate (PBS).
  • Figure 1 is a schematic diagram of using conductive glue to bond pole tabs and pole posts in one embodiment of the present application.
  • the conductive glue is applied to all the tabs at the end of the cylindrical battery core in a cross shape, and is bonded to the poles on the casing. Thereby realizing the electrical connection between the tab and the pole.
  • the positive active material lithium iron phosphate, the conductive agent conductive carbon black and the binder are mixed in a weight ratio of 96:1:3, in which the binder is modified polyvinylidene fluoride. Stir the resulting mixture thoroughly to form a slurry. By adjusting the amount of solvent N-methylpyrrolidone added, the solid content of the obtained slurry was 57%.
  • the positive electrode sheet composition (slurry) is evenly coated on the positive electrode current collector aluminum foil, and then dried, cold pressed, and cut to obtain a positive electrode with a single-sided positive electrode sheet film layer weight of 350 mg/1540.25 mm 2 piece.
  • SBR styrene-butadiene rubber
  • CMC thickener sodium carboxymethylcellulose
  • An 8 ⁇ m PE porous film is used as the base, and a 2 ⁇ m ceramic coating is coated on both sides as an isolation membrane.
  • the positive electrode sheet, isolation film, and negative electrode sheet prepared as above are stacked in order so that the isolation film is between the positive and negative electrode sheets to play an isolation role, and then rolled to obtain a cylindrical bare cell. Solder the tabs to the bare battery core.
  • Each positive electrode piece is provided with an aluminum positive electrode tab, and each negative electrode piece is provided with a copper negative electrode tab, and all the tabs are in the form of full tabs.
  • the bare battery core is installed into an aluminum casing, which is provided with a positive pole and a negative pole. All positive electrode tabs are bonded to the positive electrode post through the conductive adhesive prepared above, and all negative electrode tabs are bonded to the negative electrode post through the conductive adhesive prepared above.
  • the bonding was performed at a temperature of 25°C, resulting in a cross-shaped bond.
  • the obtained battery cells are baked at 80 to 100°C to remove water, tested for helium, and then electrolyte is injected and sealed to obtain an uncharged battery.
  • the uncharged battery is then sequentially subjected to processes such as standing, hot and cold pressing, formation, shaping, capacity testing, and high-temperature aging to obtain the lithium-ion battery product of Example 1.
  • Example 1 Except using the conductive filler composition shown in Table 1, other steps are the same as Example 1.
  • Shear strength is measured according to the national standard GB 7124-1986.
  • Swelling 1 Take a 50*50*2mm glass plate and place the prepared conductive glue on the glass plate.
  • the dispensing mass is 1 to 5g, preferably 1 to 3g.
  • 3 Take out the glass plate, remove the cured micelle, weigh the mass of the micelle with an electronic balance, and record the data.
  • Dissolution 1 Take out the micelle soaked in the electrolyte for 10 days, dry the liquid on the surface of the micelle with dust-free paper, and let it sit at room temperature for 10 to 30 minutes. 2Then soak the micelles in dimethyl carbonate solvent and place them in an oven at 70°C to 90°C for 48 hours. 3 Take out the micelle, wipe the liquid on the surface of the micelle with dust-free paper, and finally place the micelle in a dry glass beaker and bake it at 70°C to 90°C for 1 to 3 hours. After taking it out, weigh it and calculate the dissolution. rate, at least 10 samples per group.
  • Table 1 Main components of the conductive adhesive of Examples 1-4 (in grams)
  • the mixture of conductive substances formed from the powders of Ag, Ni and Cu exhibits significantly improved resistance to electrolytes, specifically manifested as swelling. and decreased dissolution.
  • a mixture of powders containing Ag, Ni and Cu as a conductive filler can reduce the volume resistance by one order of magnitude (Example 3). In fact, the mixture can significantly reduce the amount of Ag powder, which significantly reduces the manufacturing cost of conductive adhesive.
  • Example Resin matrix (20g) Ag Ni Cu 4 Epoxy resin 20 30 30 5 Acrylic 20 30 30 6 Polyurethane resin 20 30 30 7 Silicone resin 20 30 30

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

La présente demande concerne un adhésif conducteur, contenant, sur la base du poids total de l'adhésif conducteur, de 14 à 78 % en poids d'une résine organique thermoplastique, de 20 à 85 % en poids d'une charge conductrice, de 0,3 à 5 % en poids d'un agent de durcissement et éventuellement de 0 à 20 % en poids d'un diluant, la charge conductrice étant un mélange d'Ag et d'au moins deux substances conductrices choisies parmi Cu, Al, Fe, Zn, Ni, noir de carbone et graphite. La présente demande concerne également un élément de batterie contenant des languettes et des pôles reliés par l'adhésif conducteur, un bloc-batterie contenant l'élément de batterie, et un dispositif électrique.
PCT/CN2022/111686 2022-08-11 2022-08-11 Adhésif conducteur reliant une languette et un pôle, et batterie les contenant WO2024031510A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/111686 WO2024031510A1 (fr) 2022-08-11 2022-08-11 Adhésif conducteur reliant une languette et un pôle, et batterie les contenant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/111686 WO2024031510A1 (fr) 2022-08-11 2022-08-11 Adhésif conducteur reliant une languette et un pôle, et batterie les contenant

Publications (1)

Publication Number Publication Date
WO2024031510A1 true WO2024031510A1 (fr) 2024-02-15

Family

ID=89850307

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/111686 WO2024031510A1 (fr) 2022-08-11 2022-08-11 Adhésif conducteur reliant une languette et un pôle, et batterie les contenant

Country Status (1)

Country Link
WO (1) WO2024031510A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101033379A (zh) * 2006-03-10 2007-09-12 国家淀粉及化学投资控股公司 各向异性导电胶粘剂
CN108728010A (zh) * 2017-04-18 2018-11-02 中国科学院苏州纳米技术与纳米仿生研究所 一种改性导电填料、其制备方法与应用
CN108779373A (zh) * 2015-10-15 2018-11-09 汉高知识产权控股有限责任公司 镍和含有镍的合金作为粘合剂配制物中导电填料的用途
CN110343484A (zh) * 2019-06-21 2019-10-18 东南大学 基于粒子基质涂覆液态金属的各向异性导电胶及制备方法
CN216354639U (zh) * 2021-11-13 2022-04-19 宁德时代新能源科技股份有限公司 电池单体、电池和用电设备

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101033379A (zh) * 2006-03-10 2007-09-12 国家淀粉及化学投资控股公司 各向异性导电胶粘剂
CN108779373A (zh) * 2015-10-15 2018-11-09 汉高知识产权控股有限责任公司 镍和含有镍的合金作为粘合剂配制物中导电填料的用途
CN108728010A (zh) * 2017-04-18 2018-11-02 中国科学院苏州纳米技术与纳米仿生研究所 一种改性导电填料、其制备方法与应用
CN110343484A (zh) * 2019-06-21 2019-10-18 东南大学 基于粒子基质涂覆液态金属的各向异性导电胶及制备方法
CN216354639U (zh) * 2021-11-13 2022-04-19 宁德时代新能源科技股份有限公司 电池单体、电池和用电设备

Similar Documents

Publication Publication Date Title
CN101699590B (zh) 一种混合超级电容器
TWI376828B (en) Electrolytic solution and lithium battery employing the same
WO2020238521A1 (fr) Collecteur de courant d'électrode positive, plaque d'électrode positive, dispositif électrochimique et appareil électrique comprenant un dispositif électrochimique
WO2022257859A1 (fr) Batterie au lithium-ion
WO2021228193A1 (fr) Batterie au lithium-ion à charge rapide, à longue durée de vie et à haute densité d'énergie, et son procédé de préparation
CN101740807A (zh) 非水电解质二次电池
CN102769149B (zh) 聚合物锂离子电池的制造方法及聚合物锂离子电池
CN109994707B (zh) 正极片及其制备方法、电池
CN110400933B (zh) 正极极片及包括该正极极片的电化学装置
CN103259046A (zh) 可快速充电的高倍率磷酸铁锂电池的制备方法
US20230361305A1 (en) Aqueous positive electrode sheet, and secondary battery including the electrode sheet, and power consumption apparatus
CN115810799A (zh) 高性能锂金属电池电解液及高性能锂金属电池
CN101826640B (zh) 一种锂离子电池用极芯和使用该极芯的锂离子电池
WO2024088363A1 (fr) Batterie
CN111463433B (zh) 一种超高倍率磷酸铁锂电池及其制备方法
CN113471512A (zh) 一种低温锂电池
CN108690533B (zh) 一种粘结剂及其制备方法和应用
WO2024031510A1 (fr) Adhésif conducteur reliant une languette et un pôle, et batterie les contenant
WO2023060428A1 (fr) Séparateur, batterie secondaire, module de batterie, bloc-batterie et appareil de consommation d'énergie
CN115036458B (zh) 一种锂离子电池
CN111769260B (zh) 高比能量锂离子电池及其制备方法
CN114122406A (zh) 石墨烯改性磷酸铁锂的制备方法及磷酸铁锂电池
WO2015151145A1 (fr) Accumulateur au lithium entierement solide
CN113728504B (zh) 聚合物粘结剂、叠层多孔膜、电池及电子装置
WO2024040471A1 (fr) Plaque d'électrode positive et son procédé de préparation, accumulateur et dispositif électrique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22954479

Country of ref document: EP

Kind code of ref document: A1