CN116751530B - Extrusion-resistant fireproof mica tape for power battery and preparation method thereof - Google Patents
Extrusion-resistant fireproof mica tape for power battery and preparation method thereof Download PDFInfo
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- CN116751530B CN116751530B CN202311030934.5A CN202311030934A CN116751530B CN 116751530 B CN116751530 B CN 116751530B CN 202311030934 A CN202311030934 A CN 202311030934A CN 116751530 B CN116751530 B CN 116751530B
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- silica gel
- extrusion
- adhesive layer
- mica
- treatment liquid
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- 239000010445 mica Substances 0.000 title claims abstract description 153
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 153
- 238000001125 extrusion Methods 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 104
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 93
- 239000000741 silica gel Substances 0.000 claims abstract description 93
- 238000001035 drying Methods 0.000 claims abstract description 91
- 239000010410 layer Substances 0.000 claims abstract description 84
- 239000012790 adhesive layer Substances 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 239000011248 coating agent Substances 0.000 claims abstract description 31
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000004744 fabric Substances 0.000 claims abstract description 31
- 239000003365 glass fiber Substances 0.000 claims abstract description 30
- 239000002390 adhesive tape Substances 0.000 claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 35
- 229920001296 polysiloxane Polymers 0.000 claims description 27
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 21
- 229920002554 vinyl polymer Polymers 0.000 claims description 21
- 239000003063 flame retardant Substances 0.000 claims description 20
- 239000012745 toughening agent Substances 0.000 claims description 20
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 19
- -1 polysiloxane Polymers 0.000 claims description 19
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 18
- 239000002518 antifoaming agent Substances 0.000 claims description 17
- 239000003292 glue Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 229910021485 fumed silica Inorganic materials 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical group [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 7
- 239000000347 magnesium hydroxide Substances 0.000 claims description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 7
- 229920002545 silicone oil Polymers 0.000 claims description 7
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 4
- DWAWYEUJUWLESO-UHFFFAOYSA-N trichloromethylsilane Chemical group [SiH3]C(Cl)(Cl)Cl DWAWYEUJUWLESO-UHFFFAOYSA-N 0.000 claims description 4
- 239000013530 defoamer Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 43
- 239000000463 material Substances 0.000 description 37
- 239000000047 product Substances 0.000 description 20
- 238000009413 insulation Methods 0.000 description 15
- 230000008602 contraction Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000006260 foam Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000004964 aerogel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000009970 fire resistant effect Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 239000012796 inorganic flame retardant Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- 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
- C09J7/50—Adhesives in the form of films or foils characterised by a primer layer between the carrier and the adhesive
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
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- 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
- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/28—Presence of paper
- C09J2400/283—Presence of paper in the substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Aviation & Aerospace Engineering (AREA)
- Inorganic Chemistry (AREA)
- Insulated Conductors (AREA)
Abstract
The application discloses an extrusion-resistant fireproof mica tape for a power battery and a preparation method thereof. The extrusion-resistant fireproof mica tape for the power battery comprises mica paper, glass fiber cloth and double-sided adhesive tape, wherein one side of the mica paper is connected with the glass fiber cloth through an adhesive layer, and the other side of the mica paper is connected with the double-sided adhesive tape through a silica gel layer. The preparation method of the extrusion-resistant fireproof mica tape for the power battery comprises the following steps of: s1, preparing a silica gel layer treatment liquid and an adhesive layer treatment liquid; s2, coating the adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one side of the mica paper through an adhesive layer, and drying to obtain an adhesive layer; s3, coating the adhesive treatment liquid on the other surface of the mica paper, and then drying to obtain a silica gel layer; and S4, cutting the dried product in the step S3, and adhering the double faced adhesive tape to a silica gel layer of the cut product to obtain a finished product. The finished product prepared by the application has the advantages of thinner thickness, extrusion resistance and better fireproof performance.
Description
Technical Field
The application relates to the technical field of mica tape materials, in particular to an extrusion-resistant fireproof mica tape for a power battery and a preparation method thereof.
Background
In the rapid development process of the new energy automobile industry, the safety of the power battery pack is increasingly concerned as a power source of new energy. The safety of the current power battery pack is mainly expressed in the following two aspects:
1. in the charge and discharge process of the lithium ion battery, internal lithium ions are inserted into and separated from the electrode active material end, so that expansion or contraction of the battery is caused, and therefore, a buffer material between modules needs to be installed between the batteries, but if the buffer material between the modules is too thick, heat cannot be effectively emitted between the modules, heat accumulation is caused, the working temperature of the modules is increased, and the normal working and service life of electronic components are affected.
2. In the use process of the power battery, when unexpected situations such as vehicle collision, extrusion and the like occur, external force can cause damage, short circuit and the like of internal components of the battery, thereby causing fire disaster. Therefore, the battery requires a buffer material that is resistant to extrusion and fire. Because the extrusion-resistant buffer material can disperse impact force, damage and breakage of external force to internal components of the battery are reduced, flame propagation and combustion can be restrained by fireproof performance, expansion of fire is prevented, and safety of the battery is improved.
The battery module buffer materials of the new energy automobile in the current market mainly comprise foam, mica plates, aerogel and the like, and the materials have certain defects and are thicker, for example, the foam materials are poor in heat insulation performance, not resistant to high temperature, the mica plates are harder and not resistant to extrusion, and the aerogel heat insulation felt is poor in high-temperature insulation performance.
Therefore, there is a need for a battery module buffer material having a small thickness, being resistant to extrusion, and having good fire resistance.
Disclosure of Invention
In order to solve at least one technical problem, the application provides an extrusion-resistant fireproof mica tape for a power battery and a preparation method thereof.
On one hand, the extrusion-resistant fireproof mica tape for the power battery comprises mica paper, glass fiber cloth, an adhesive layer, a silica gel layer and a double-sided adhesive tape, wherein one side of the mica paper is connected with the glass fiber cloth through the adhesive layer, and the other side of the mica paper is connected with the double-sided adhesive tape through the silica gel layer;
wherein, the silica gel layer comprises the following raw materials in parts by weight: 6-8 parts of vinyl polysiloxane, 1.5-2.5 parts of toughening agent, 0.5-1.5 parts of defoamer, 0.5-1.5 parts of flame retardant and 0.3-1 part of silane coupling agent;
the adhesive layer comprises the following raw materials in parts by weight: 10-12 parts of nano silica gel and 3-5 parts of fumed silica.
By adopting the technical scheme, the extrusion-resistant fireproof mica tape for the power battery, which is prepared by adopting specific raw materials and proportions, has the advantages of thinner thickness, extrusion resistance and better high-temperature insulation. Compared with the prior art which adopts foam and mica plates as the base material, the mica paper is thinner; in addition, the vinyl polysiloxane in the silica gel layer is a polymer material, and is obtained by polymerization reaction of vinyl monomers and siloxane monomers, the toughening agent, the defoaming agent, the flame retardant and the silane coupling agent are auxiliary agents added in the polymerization reaction, and the main chain of the polysiloxane is connected by siloxane bonds, so that the structural stability of the siloxane bonds is higher, and the material has better extrusion resistance; the toughness and strength of the material can be improved by adding the toughening agent, and the extrusion resistance of the material is improved; the addition of the defoaming agent can reduce bubbles and holes in the material, and improve the compactness and extrusion resistance of the material; the addition of the flame retardant can reduce the combustion performance of the material and improve the high temperature resistance of the material; the addition of the silane coupling agent can improve the interfacial compatibility of the material and enhance the extrusion resistance and high-temperature resistance insulating property of the material.
Optionally, in the silica gel layer, the weight ratio of the vinyl polysiloxane, the toughening agent, the defoaming agent, the flame retardant and the silane coupling agent is 6:2.5:1:1:0.3.
optionally, the toughening agent is ethylene propylene rubber; the defoaming agent is silicone oil; the flame retardant is magnesium hydroxide; the silane coupling agent is trichloromethyl silane.
In a second aspect, the application provides a preparation method of the extrusion-resistant fireproof mica tape for a power battery, which comprises the following steps:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
By adopting the technical scheme, the extrusion-resistant fireproof mica tape for the power battery is thinner in thickness and better in extrusion resistance and high-temperature insulation.
Optionally, in S1, the stirring speed in the preparation of the silica gel treatment solution is not less than 400 rpm, and the stirring time is not less than 20min.
By adopting the technical scheme, the extrusion-resistant fireproof mica tape for the power battery is uniformly mixed and has stable performance.
Optionally, in the step S2, the adhesive is coated on the mica paper by a glue coating roller, and the rotation speed of the glue coating roller is 0.5-1.5 r/min during the glue coating.
Optionally, in the step S2, three sections of drying technology are adopted for drying, wherein the drying temperature of the first section is 80+/-10 ℃, and the drying time is 5-15min; the second stage drying temperature is 140+ -10deg.C, and drying time is 5-15min; the third section is at 90+ -10deg.C for 5-15min.
By adopting the technical scheme, the extrusion-resistant fireproof mica tape for the power battery, which is prepared by the application, adopts a specific three-stage drying process, so that the adhesive, the glass fiber cloth and the mica paper are completely attached, the phenomenon that the temperature is too low, the product is not dry, and the subsequent mica adhesiveness is not strong is avoided; meanwhile, the phenomenon that the glass fiber cloth contracts due to overhigh temperature is avoided.
Optionally, in S3, the silica gel is coated by slit coating, and a gap of the slit is 1.0-1.5mm.
Optionally, in the step S3, the drying temperature is 110-130 ℃ and the drying time is 5-15min.
By adopting the technical scheme, the extrusion-resistant fireproof mica tape for the power battery is suitable in drying temperature, and if the temperature is lower than 110 ℃, the silica gel layer cannot be solidified; if the temperature is higher than 130 ℃, the silica gel layer is cracked, and the performance of the silica gel layer is seriously affected.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the extrusion-resistant fireproof mica tape for the power battery, which is prepared by adopting specific raw materials and proportions, has the advantages of thinner thickness, extrusion resistance and better high-temperature insulation.
2. The extrusion-resistant fireproof mica tape for the power battery is uniformly mixed and has stable performance.
3. The extrusion-resistant fireproof mica tape for the power battery, which is prepared by the application, adopts a specific three-stage drying process, so that the adhesive, the glass fiber cloth and the mica paper are completely attached, the phenomenon that the temperature is too low, the product is not dry and the subsequent mica adhesiveness is not strong is avoided; meanwhile, the phenomenon that the glass fiber cloth contracts due to overhigh temperature is avoided.
Drawings
FIG. 1 is a schematic view of the extrusion-resistant fire-resistant mica tape for a power battery of the present application;
reference numerals illustrate: 1. glass fiber cloth 2, mica paper 3, silica gel layer 4 and double faced adhesive tape.
Detailed Description
The application is described in further detail below with reference to the drawings and examples.
The application designs an extrusion-resistant fireproof mica tape for a power battery, which comprises mica paper, glass fiber cloth, an adhesive layer, a silica gel layer and a double-sided adhesive tape, wherein one side of the mica paper is connected with the glass fiber cloth through the adhesive layer, and the other side of the mica paper is connected with the double-sided adhesive tape through the silica gel layer;
wherein, the silica gel layer comprises the following raw materials in parts by weight: 6-8 parts of vinyl polysiloxane, 1.5-2.5 parts of toughening agent, 0.5-1.5 parts of defoamer, 0.5-1.5 parts of flame retardant and 0.3-1 part of silane coupling agent;
the adhesive layer comprises the following raw materials in parts by weight: 10-12 parts of nano silica gel and 3-5 parts of fumed silica.
The extrusion-resistant fireproof mica tape for the power battery is prepared by the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
The technical problems of the present application include two aspects:
1. in the charge and discharge process of the lithium ion battery, internal lithium ions are inserted into and separated from the electrode active material end, so that expansion or contraction of the battery is caused, and therefore, a buffer material between modules needs to be installed between the batteries, but if the buffer material between the modules is too thick, heat cannot be effectively emitted between the modules, heat accumulation is caused, the working temperature of the modules is increased, and the normal working and service life of electronic components are affected.
2. In the use process of the power battery, when unexpected situations such as vehicle collision, extrusion and the like occur, external force can cause damage, short circuit and the like of internal components of the battery, thereby causing fire disaster. Therefore, the battery requires a buffer material that is resistant to extrusion and fire. Because the extrusion-resistant buffer material can disperse impact force, damage and breakage of external force to internal components of the battery are reduced, flame propagation and combustion can be restrained by fireproof performance, expansion of fire is prevented, and safety of the battery is improved.
The battery module buffer materials of the new energy automobile in the current market mainly comprise foam, mica plates, aerogel and the like, and the materials have certain defects and are thicker, for example, the foam materials are poor in heat insulation performance, not resistant to high temperature, the mica plates are harder and not resistant to extrusion, and the aerogel heat insulation felt is poor in high-temperature insulation performance.
Based on the problems, the inventor designs the technical scheme of the application, and the extrusion-resistant fireproof mica tape for the power battery prepared by adopting specific raw materials and proportions has the advantages of thinner thickness, extrusion resistance and better high-temperature insulation property. Compared with the prior art which adopts foam and mica plates as the base material, the mica paper is thinner; in addition, the vinyl polysiloxane in the silica gel layer is a polymer material, and is obtained by polymerization reaction of vinyl monomers and siloxane monomers, the toughening agent, the defoaming agent, the flame retardant and the silane coupling agent are auxiliary agents added in the polymerization reaction, and the main chain of the polysiloxane is connected by siloxane bonds, so that the structural stability of the siloxane bonds is higher, and the material has better extrusion resistance; the toughness and strength of the material can be improved by adding the toughening agent, and the extrusion resistance of the material is improved; the addition of the defoaming agent can reduce bubbles and holes in the material, and improve the compactness and extrusion resistance of the material; the addition of the flame retardant can reduce the combustion performance of the material and improve the high temperature resistance of the material; the addition of the silane coupling agent can improve the interfacial compatibility of the material and enhance the extrusion resistance and high-temperature resistance insulating property of the material.
The raw materials used in the application are all from commercial products, and specific manufacturers are shown in table 1.
TABLE 1
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Examples 1 to 5
The specific contents of the raw materials of the extrusion-resistant fireproof mica tape for the power batteries of examples 1-5 are shown in Table 2.
TABLE 2
Example 1
The extrusion-resistant fireproof mica tape for the power battery is prepared by adopting the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper 2, attaching glass fiber cloth 1 on one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer 3;
and S4, cutting the dried product of the step S3, and attaching the double faced adhesive tape 4 on the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
In the step S1, the stirring speed is 550r/min, and the stirring time is 30min.
In the step S2, the rotating speed of the glue applying roller is 1.5 revolutions per minute during glue applying.
In the step S2, the drying process adopts three sections for drying, the drying temperature of the first section is 80-85 ℃, and the drying time is 15min; the second section drying temperature is 140-145 ℃ and the drying time is 15min; the third section is at 90-95deg.C for 15min.
In the step S3, the silica gel is coated by slit coating, and the gap of the slit is 1.5mm.
In the step S3, the drying temperature is 110-115 ℃ and the drying time is 15min.
Example 2
The extrusion-resistant fireproof mica tape for the power battery is prepared by adopting the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
In the step S1, the stirring speed is 550r/min, and the stirring time is 30min.
In the step S2, the rotating speed of the glue applying roller is 1.2 revolutions per minute during glue applying.
In the step S2, the drying process adopts three sections for drying, the drying temperature of the first section is 80-85 ℃, and the drying time is 15min; the second section drying temperature is 140-145 ℃ and the drying time is 15min; the third section is at 90-95deg.C for 15min.
In the step S3, the silica gel is coated by slit coating, and the gap of the slit is 1.5mm.
In the step S3, the drying temperature is 110-115 ℃ and the drying time is 15min.
Example 3
The extrusion-resistant fireproof mica tape for the power battery is prepared by adopting the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
In the step S1, the stirring speed is 550r/min, and the stirring time is 30min.
In the step S2, the rotating speed of the glue applying roller is 1.5 revolutions per minute during glue applying.
In the step S2, the drying process adopts three sections for drying, the drying temperature of the first section is 70-75 ℃, and the drying time is 15min; the second stage drying temperature is 130-135 ℃ and the drying time is 15min; the third section is at 80-85deg.C for 15min.
In the step S3, the silica gel is coated by slit coating, and the gap of the slit is 1.5mm.
In the step S3, the drying temperature is 110-115 ℃ and the drying time is 15min.
Example 4
The extrusion-resistant fireproof mica tape for the power battery is prepared by adopting the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
In the step S1, the stirring speed is 550r/min, and the stirring time is 30min.
In the step S2, the rotating speed of the glue applying roller is 1.5 revolutions per minute during glue applying.
In the step S2, the drying process adopts three sections for drying, the drying temperature of the first section is 80-85 ℃, and the drying time is 15min; the second section drying temperature is 140-145 ℃ and the drying time is 15min; the third section is at 90-95deg.C for 15min.
In the step S3, the silica gel is coated by slit coating, and the gap of the slit is 1.0mm.
In the step S3, the drying temperature is 110-115 ℃ and the drying time is 15min.
Example 5
The extrusion-resistant fireproof mica tape for the power battery is prepared by adopting the following method, and comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
and S4, cutting the dried product in the S3, and attaching double-sided adhesive tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery.
In the step S1, the stirring speed is 550r/min, and the stirring time is 30min.
In the step S2, the rotating speed of the glue applying roller is 1.5 revolutions per minute during glue applying.
In the step S2, the drying process adopts three sections for drying, the drying temperature of the first section is 80-85 ℃, and the drying time is 15min; the second section drying temperature is 140-145 ℃ and the drying time is 15min; the third section is at 90-95deg.C for 15min.
In the step S3, the silica gel is coated by slit coating, and the gap of the slit is 1.5mm.
In the step S3, the drying temperature is 115-120 ℃ and the drying time is 15min.
Comparative examples 1 to 17
Comparative example 1
The procedure of example 1 was followed except that the vinyl silicone content of the silicone layer was 4 kg.
Comparative example 2
The procedure of example 1 was followed except that the vinyl silicone content of the silicone layer was 10 kg.
Comparative example 3
Based on example 1, the components and preparation were the same as in example 1 except that the ethylene propylene rubber content in the silica gel layer was 0.5 kg.
Comparative example 4
Based on example 1, the components and preparation method were the same as in example 1 except that the ethylene propylene rubber content in the silica gel layer was 3 kg.
Comparative example 5
The composition and preparation were the same as in example 1, except that the silicone oil content in the silicone layer was 0.1kg, based on example 1.
Comparative example 6
Based on example 1, the components and preparation were the same as in example 1 except that the silicone oil content in the silicone layer was 2 kg.
Comparative example 7
The composition and preparation were the same as in example 1, except that the magnesium hydroxide content in the silica gel layer was 0.2kg based on example 1.
Comparative example 8
The procedure of example 1 was followed, except that the magnesium hydroxide content in the silica gel layer was 2 kg.
Comparative example 9
The composition and preparation were the same as in example 1, except that the content of trichloromethylsilane in the silica gel layer was 0.1kg, based on example 1.
Comparative example 10
Based on example 1, the other components and preparation methods were the same as in example 1 except that in S1, the stirring speed was 350 r/min.
Comparative example 11
Based on example 1, the other components and preparation methods were the same as in example 1 except that in S1, the stirring time was 10 min.
Comparative example 12
Based on the embodiment 1, the other components and the preparation method are the same as the embodiment 1 except that in the S2 drying process, the first stage drying temperature is 60-65 ℃, the second stage drying temperature is 95-100 ℃, and the third stage drying temperature is 55-60 ℃.
Comparative example 13
Based on the embodiment 1, the other components and preparation methods are the same as those of the embodiment 1 except that in the S2 drying process, the first stage drying temperature is 110-115 ℃, the second stage drying temperature is 155-160 ℃, and the third stage drying temperature is 110-115 ℃.
Comparative example 14
Based on example 1, in S2, the components and preparation methods were the same as in example 1 except that the replacement silicone layer was foam.
Comparative example 15
Based on example 1, in S2, the components and preparation methods were the same as in example 1 except that the replacement silicone layer was a mica plate.
Comparative example 16
Based on example 1, the components and preparation methods were the same as in example 1 except that in S3, the drying temperature was 95-100deg.C.
Comparative example 17
Based on example 1, the components and preparation methods were the same as in example 1 except that in S3, the drying temperature was 135-140 ℃.
Experimental detection
Detection item and detection method
1. Thickness: the thickness at 3 above was measured at 3 arbitrary positions on the mica tape.
2. Fire resistance: the fire resistance of the mica tape is detected by using flame impact at 1000 ℃ to burn the material for 10min at any position of 3 on the mica tape according to the detection method of GB/T5464-2010 non-combustibility test method of building materials.
3. Elastic expansion and contraction amount: and (3) pressing the sample to the thinnest by using a press, measuring the deformation quantity of the original thickness, and specifically detecting the elastic expansion quantity of the mica tape according to the detection method of GB/T5019-2008 mica tape.
4. High temperature insulation: at any position 3 on the mica tape, burning with flame at 1000 ℃ for 10min, pressurizing with 6000V DC voltage, observing whether breakdown occurs, and specifically detecting the high temperature insulation of the mica tape according to the detection method of GB/T5019-2008 mica tape.
5. Mica tape appearance: the appearance of the mica tape was observed at normal temperature, and it was checked whether the mica tape had bubbles on the surface, cracks on the surface, and white floc on the buffer layer.
The extrusion-resistant fire-resistant mica tapes for power cells prepared in examples 1 to 5 and comparative examples 1 to 17 were subjected to thickness measurement, and the measurement results were recorded in table 3.
TABLE 3 summary of thickness measurements for examples 1-5 and comparative examples 1-17
From the results of Table 3, it is apparent that the extrusion-resistant fireproof mica tape for power cells prepared in comparative example 1 is too thin in thickness because the vinyl polysiloxane content is too small, resulting in failure of the cured silica gel layer to reach 0.35mm or more and failure of the buffer layer to form; in addition, the thicknesses of comparative example 14 and comparative example 15 were each greatly varied, respectively, because of replacement of the foam and the mica plate, resulting in thicker mica tapes.
From the results of table 3, it is also evident that the extrusion-resistant fireproof mica tape for power cells prepared in example 3 was relatively uniform, indicating that the mica tape prepared in the proportions of example 3 was more excellent in performance than other examples.
The extrusion-resistant fire-resistant mica tapes for power cells prepared in examples 1 to 5 and comparative examples 1 to 17 were subjected to performance tests for fire resistance and high-temperature insulation, and the test results were recorded in table 4.
TABLE 4 results of the tests for the fire resistance and the high temperature insulation of examples 1 to 5 and comparative examples 1 to 17
From the results of table 4, it is understood that the extrusion-resistant fire-retardant mica for power cells prepared in comparative example 7 was broken down because the content of the added inorganic flame retardant magnesium hydroxide was too small, and the heat absorption water vapor generated by decomposition of magnesium hydroxide at high temperature was too small, thereby resulting in poor flame retardant effect; at the same time, comparative example 14 was burned through and broken down, indicating that the foam was poor in fire resistance and high temperature insulation.
The extrusion-resistant fire-resistant mica tapes for power cells prepared in examples 1 to 5 and comparative examples 1 to 17 were subjected to performance tests of the elastic expansion amount and the appearance of the mica tapes, and the test results were recorded in table 5.
TABLE 5 results of the elastic expansion and contraction amounts and the mica tape appearance test of examples 1 to 5 and comparative examples 1 to 17
From the results in table 5, it is clear that the mica tape prepared in comparative example 3 has too high elastic expansion amount, because the content of the added toughening agent is too low, so that the produced mica tape is easy to deform greatly under the action of stress, and the size of the mica tape is unstable; in contrast, if the content of the toughening agent added in reference to comparative example 4 is too high, the toughness of the mica tape is too high, thereby making the mica tape easily broken or cracked.
The mica tape prepared in comparative example 14 has too high elastic expansion and contraction quantity, which reflects that the prepared mica tape can easily deform greatly under the action of stress, so that the size of the mica tape is unstable, and the elastic expansion and contraction quantity of the mica tape is too high, so that the absorption capacity of the mica tape to impact and vibration can be reduced, and the anti-seismic performance of the material is affected; in contrast, comparative example 15 has too low an elastic expansion and contraction, reflecting that the mica tape prepared therefrom is too hard, and the material is less deformed when subjected to an external force, has poor flexibility, is liable to cause stress concentration and breakage, and has poor resistance to impact and vibration.
The silica gel layer prepared in comparative example 2 has poor curing effect and cannot form a buffer layer, because the added vinyl polysiloxane content is too high, the polymerization reaction rate is possibly too slow, the curing process of the silica gel buffer layer is affected, and meanwhile, the silica gel buffer layer is too soft and elastic due to the too high vinyl polysiloxane content, the resistance to mechanical impact and extrusion is lost, and a stable buffer layer cannot be formed.
The silica gel layers prepared in comparative examples 10 to 11 had poor curing effect because the stirring speed was too low and the stirring time was too short. Therefore, the stirring cannot be uniform, resulting in poor curing effect of the silica gel layer.
The silica gel layer prepared in comparative example 12 had poor curing effect because the temperature of the three-stage drying process was too low, resulting in non-drying of the product and thus poor curing effect of the silica gel layer.
The appearance of the mica tape of comparative example 5 resulted in bubbles, because the defoaming agent added was less silicone oil, resulting in failure to eliminate bubbles.
The mica tapes of comparative examples 6 and 8 had white precipitates in appearance because the silicone oil added with the antifoaming agent was too much and the inorganic flame retardant was too much, resulting in that the silicone oil and magnesium hydroxide could not volatilize completely or decompose to remain during curing, and white precipitates were formed.
The mica tape prepared in comparative example 9 had powder falling due to the fact that the content of the added trichloromethylsilane was too low, which resulted in the prepared silica gel layer not being able to adhere to the cloth cover of the mica tape.
The mica tapes prepared in comparative example 12 and comparative example 16 exhibited powder falling due to the fact that the temperature of drying was too low, resulting in non-drying of the product and subsequent anti-sticking of the product.
The mica tapes prepared in comparative example 13 and comparative example 17 exhibited cracks because the baking temperature was too high, and the interlayer structure of mica was likely to be broken or changed, resulting in the formation of cracks.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (5)
1. The extrusion-resistant fireproof mica tape for the power battery is characterized by comprising mica paper, glass fiber cloth, an adhesive layer, a silica gel layer and a double-sided adhesive tape, wherein one surface of the mica paper is connected with the glass fiber cloth through the adhesive layer, and the other surface of the mica paper is connected with the double-sided adhesive tape through the silica gel layer;
wherein, the silica gel layer comprises the following raw materials in parts by weight: 6 parts of vinyl polysiloxane, 2.5 parts of toughening agent, 1 part of defoamer, 1 part of flame retardant and 0.3 part of silane coupling agent;
the adhesive layer comprises the following raw materials in parts by weight: 10-12 parts of nano silica gel and 3-5 parts of fumed silica;
the toughening agent is ethylene propylene rubber, the defoaming agent is silicone oil, the flame retardant is magnesium hydroxide, and the silane coupling agent is trichloromethylsilane;
the preparation method of the extrusion-resistant fireproof mica tape for the power battery comprises the following steps of:
s1, adding vinyl polysiloxane, a toughening agent, a defoaming agent, a flame retardant and a silane coupling agent into a container, mixing and stirring to prepare a silica gel layer treatment liquid for standby, and then placing nano silica gel and fumed silica into the container, mixing and stirring to prepare an adhesive layer treatment liquid for standby;
s2, coating an adhesive layer treatment liquid on mica paper, attaching glass fiber cloth to one surface of the mica paper coated with the adhesive layer treatment liquid, and drying, wherein the adhesive layer treatment liquid forms an adhesive layer, and the mica paper is connected with the glass fiber cloth through the adhesive layer;
s3, coating a silica gel layer treatment liquid on the other surface of the mica paper, and then drying the mica paper, wherein the silica gel layer treatment liquid forms a silica gel layer;
s4, cutting the dried product in the S3, and attaching double-sided tape to the silica gel layer of the cut product to prepare the extrusion-resistant fireproof mica tape for the power battery; in the step S2, a three-section drying process is adopted for drying, the drying temperature of the first section is 80+/-10 ℃, and the drying time is 5-15min; the second stage drying temperature is 140+ -10deg.C, and drying time is 5-15min; the third section is at 90+ -10deg.C for 5-15min.
2. The method for producing extrusion-resistant fireproof mica tape for power battery according to claim 1, wherein in S1, the stirring speed is not lower than 400 rpm and the stirring time is not lower than 20min.
3. The method for preparing the extrusion-resistant fireproof mica tape for the power battery according to claim 1, wherein in the step S2, the adhesive layer treatment liquid is coated on mica paper through a glue coating roller, and the rotating speed of the glue coating roller is 0.5-1.5 r/min during glue coating.
4. The method for producing extrusion-resistant fireproof mica tape for power battery according to claim 1, wherein in S3, the silica gel is coated by slit coating, and the slit gap is 1.0-1.5mm.
5. The method for producing extrusion-resistant fireproof mica tape for power battery according to claim 1, wherein in S3, the drying temperature is 110-130 ℃ and the drying time is 5-15min.
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| CN111207173A (en) * | 2020-01-09 | 2020-05-29 | 苏州赛伍应用技术股份有限公司 | Buffering silica gel sheet used between electric cores of power battery pack, preparation method of buffering silica gel sheet and power battery pack comprising buffering silica gel sheet |
| CN217047831U (en) * | 2022-01-27 | 2022-07-26 | 蜂巢能源科技股份有限公司 | Buffering flame retardant material structure and battery pack |
| CN114456729A (en) * | 2022-02-09 | 2022-05-10 | 浙江荣泰电工器材股份有限公司 | High-temperature-resistant reusable mica tape and preparation method thereof |
| CN114974717A (en) * | 2022-06-24 | 2022-08-30 | 浙江立洲线缆股份有限公司 | Flame-retardant fireproof self-temperature-measuring low-voltage power cable |
| CN115011274A (en) * | 2022-06-24 | 2022-09-06 | 浙江权威胶粘制品有限公司 | Modified acrylate high-temperature-resistant adhesive tape and preparation method thereof |
| CN115873527A (en) * | 2022-12-21 | 2023-03-31 | 江苏哲华精密制造有限公司 | Buffer high-temperature-resistant double-sided adhesive tape and preparation method thereof |
| CN219523264U (en) * | 2023-02-28 | 2023-08-15 | 湖北平安电工科技股份公司 | Heat-insulating fireproof composite board for lithium battery |
| CN116190865A (en) * | 2023-04-28 | 2023-05-30 | 北京倚天凌云科技股份有限公司 | High-temperature-resistant mica tape, mica heat insulation piece and preparation method of mica heat insulation piece |
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