CN116333567B - Insulating powder for flexible connection of bus bar of power battery and preparation method thereof - Google Patents
Insulating powder for flexible connection of bus bar of power battery and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003822 epoxy resin Substances 0.000 claims abstract description 56
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 56
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000002608 ionic liquid Substances 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 239000000049 pigment Substances 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 17
- 235000013824 polyphenols Nutrition 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 150000008442 polyphenolic compounds Chemical class 0.000 claims abstract description 7
- -1 phenolic aldehyde Chemical class 0.000 claims description 35
- 239000004593 Epoxy Substances 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 16
- 229920001661 Chitosan Polymers 0.000 claims description 14
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 12
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 10
- 239000000539 dimer Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 239000006229 carbon black Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 5
- UANYHTKPOZUZGT-UHFFFAOYSA-N S(=O)(=O)(O)O.N1CCCCCC1 Chemical compound S(=O)(=O)(O)O.N1CCCCCC1 UANYHTKPOZUZGT-UHFFFAOYSA-N 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 235000019260 propionic acid Nutrition 0.000 claims description 4
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical group O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 230000003078 antioxidant effect Effects 0.000 claims description 2
- 229920003986 novolac Polymers 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000178 monomer Substances 0.000 claims 1
- 150000002978 peroxides Chemical class 0.000 claims 1
- 150000003512 tertiary amines Chemical class 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract 1
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 229910052744 lithium Inorganic materials 0.000 abstract 1
- 150000003866 tertiary ammonium salts Chemical class 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- KYXHKHDZJSDWEF-LHLOQNFPSA-N CCCCCCC1=C(CCCCCC)C(\C=C\CCCCCCCC(O)=O)C(CCCCCCCC(O)=O)CC1 Chemical compound CCCCCCC1=C(CCCCCC)C(\C=C\CCCCCCCC(O)=O)C(CCCCCCCC(O)=O)CC1 KYXHKHDZJSDWEF-LHLOQNFPSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical group NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- YSWBFLWKAIRHEI-UHFFFAOYSA-N 4,5-dimethyl-1h-imidazole Chemical compound CC=1N=CNC=1C YSWBFLWKAIRHEI-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 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 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
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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
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/04—Epoxynovolacs
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
-
- 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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Epoxy Resins (AREA)
Abstract
The invention discloses insulating powder for flexible connection of bus bars of power batteries and a preparation method thereof, wherein composite modified epoxy resin is used as a main base material, a novel polyphenol curing system, a formula system is formed by double-coated tertiary ammonium salt type ionic liquid catalysis, pigment and filler and various auxiliary agents, and the insulating powder with torsion resistance is developed for flexible connection of copper bars of lithium batteries. The coating formed by curing the insulating powder prepared by the invention has higher torsion resistance, and can be repeatedly folded for 40 times on a soft copper wire with the diameter of 1mm without breaking, thereby completely meeting the performance requirement of the soft connection insulating coating in the field of power batteries.
Description
Technical Field
The invention relates to insulating powder for flexible connection of a bus bar of a power battery and a preparation method thereof, belonging to the field of new materials.
Background
The busbar flexible connection is used as a very critical part in the power battery, solves the defects of easy heating, high energy consumption and the like in the use process of the traditional busbar, ensures that the flexible connection resistance reaches the microohm standard, can improve the conductivity, and can repair the error in the assembly process of the power battery, and has the characteristics of energy conservation, consumption reduction, good flexibility, easy heat dissipation, bending resistance and the like. The insulation of the flexible connection is performed by using a PVC sleeve, the sleeve has long been subjected to the problems of short service life, poor adhesion with a base material, insufficient voltage withstand capability, excessively thick insulating layer, more construction limiting factors and the like, in recent years, the powder fluidization technology rapidly replaces the sleeve technology in the field of connection rows, but the powder coating is too hard and does not have anti-torsion performance, and the insulating powder for the flexible connection of the bus bar still adopts the thermoplastic sleeve technology at present, so that the development of the insulating powder for the flexible connection of the bus bar of the power battery is the trend of industry.
Disclosure of Invention
The invention aims to provide insulating powder for flexible connection of a bus bar of a power battery, which is designed to be the insulating coating of the flexible connection of the bus bar of the power battery in the new energy field, one of the new standards in the new energy automobile field is that the thickness of a coating of a connecting bar is 0.5-0.8 mm, the voltage resistance is more than 2kV, the single point is that a PVC sleeve cannot meet the requirement, the standard is inevitably used in the power battery field as the core of the new energy automobile, the insulating coating of the flexible connection of the bus bar adopts the powder coating fluidization technology to be a necessary way, the traditional powder coating cannot meet the standard requirement, the insulating powder which is designed in a targeted way of the invention shows more outstanding torsion resistance on the basis of retaining all the characteristics of the traditional powder, and the technical problem of flexible connection insulating coating of the bus bar is directly solved, so that the insulating powder has important guidance in the electric insulation field.
The invention further aims to provide a preparation method of the insulating powder for flexible connection of the bus bar of the power battery.
In order to solve the technical problems, the invention adopts the following technical scheme:
the insulating powder for flexible connection of the bus bar of the power battery comprises the following raw materials in parts by weight:
base material A:50% -60%;
base material B:10% -15%;
base material C:3% -5%;
pigment and filler: 20% -35%;
auxiliary agent: 3% -5%; the sum of the weight of the components is 100 percent.
Preferably, the base material A is a composite material of dimer acid modified epoxy resin and phenolic aldehyde modified epoxy resin. The inventor finds that the dimer acid and phenolic resin synergistically toughen the epoxy, the flexibility of the coating can be greatly improved, and the target effect can not be achieved by using the epoxy resin alone, so that a dimer acid modified epoxy resin and phenolic novolac modified epoxy resin composite system is designed to be used as a main base material of a formula, and the preparation method comprises the following steps: taking a proper amount of semisolid dimeric acid modified epoxy resin, weighing 5% -7% of white carbon black in parts by mass in a ball mill, and fully solidifying after ball milling, wherein the epoxy equivalent is 600-700 g/eq; and then adding a certain mass of phenolic aldehyde-modified epoxy resin into a ball mill, wherein the epoxy equivalent is 750-850 g/eq, the mass ratio of the two resins is 1:2-1:3, and continuing ball milling to obtain white powder.
Preferably, the base material B is hexamethylimine modified polyhydric phenol, and is a homemade product of Jiangsu Jiangnan insulating powder Limited company.
Preferably, the base C is a composite of ethylene-octene high Polymer (POE) double grafted maleic anhydride/epoxy resin (POE-g-MAH/EP) and polyvinyl butyral (PVB). PVB has excellent physical toughening effect and high compatibility with epoxy resin, but cannot achieve ideal effect due to the fact that the addition amount is not large, the low addition amount high toughening effect can be achieved by using the compound elastomer POE, and the high compatibility with the main base stock is achieved by double grafting of the POE and maleic anhydride/epoxy resin.
Preferably, spherical silica is used as the pigment and filler, and the particle size is 3000-5000 meshes.
Preferably, the auxiliary agent is a mixture of a compatilizer, an accelerator, a leveling agent, an antioxidant, a defoaming agent and pigment.
Wherein the accelerator is double-coated tertiary amine salt ionic liquid 1- (propionic acid group) homopiperidine bisulfate, and the preparation method is as follows: firstly preparing chitosan coated tertiary amine salt ionic liquid by using an ionic gel method, then using polyethylene wax as an outer coating shell, using chitosan coated tertiary amine salt ionic liquid as a core, and using a bonding machine for binding treatment to finally obtain the double-coating tertiary amine salt ionic liquid.
The invention also discloses a preparation method of the insulating powder, which comprises the following steps:
(1) Preparing a base material A: taking a proper amount of semisolid dimeric acid modified epoxy resin, weighing 5% -7% of white carbon black in parts by mass in a ball mill, and fully solidifying after ball milling, wherein the epoxy equivalent is 600-700 g/eq; adding a certain mass of phenolic aldehyde-modified epoxy resin into a ball mill, wherein the epoxy equivalent is 750-850 g/eq, the mass ratio of the two resins is 1:2-1:3, and continuing ball milling to obtain white powder;
(2) Preparing a base material C: taking a certain mass of ethylene-octene high Polymer (POE), five thousandths of dicumyl peroxide (DCP) in parts by mass, 2% -3% of Maleic Anhydride (MAH) in parts by mass and 3% -5% of epoxy resin (EP) in parts by mass, banburying for 9min at 180 ℃ in an internal mixer to prepare ethylene-octene high polymer double-grafted maleic anhydride/epoxy resin (POE-g-MAH/EP), and tabletting, cooling and crushing while hot after banburying is finished to obtain solid particles; then taking and physically mixing polyvinyl butyral (PVB) with equal parts by mass;
(3) Preparing an accelerator: preparing chitosan coated tertiary amine salt ionic liquid by an ionic gel method, then taking polyethylene wax as an outer coating shell, taking the chitosan coated tertiary amine salt ionic liquid as a core, and binding by a binding machine to obtain double coated tertiary amine salt ionic liquid which is milky white powder;
(4) Accurately weighing the products obtained in the steps (1), (2) and (3) according to a proportion, putting the products into a mixing cylinder, then adding corresponding parts of hexamethylimine modified polyphenol, pigment filler and other auxiliary agents except accelerator, and stirring for 7min at 800-900 r/min to uniformly mix the products;
(5) Melt extruding the mixture obtained in the step (4) through a double screw, wherein the temperature of a melting section is 95-100 ℃, the extrusion temperature of a machine head is 100-105 ℃, and the screw is heated by adopting an oil bath; then tabletting, air cooling, crushing, air grading, granulating and sieving to obtain the finished product.
The technical scheme of the invention has the beneficial effects that:
(1) The dimer acid modified epoxy resin and the linear phenolic resin modified epoxy resin are utilized to synergistically toughen the epoxy resin, so that the flexibility of the coating is intuitively improved, the limitation of the hardness and brittleness of the epoxy resin is eliminated, and the main base material structure is toughened.
(2) The compatibility problem of the elastomer and the epoxy resin is solved by adopting the double-grafted elastomer POE-g-MAH/EP, the elastomer is innovatively applied to the field of insulating powder, and meanwhile, the double-grafted elastomer POE-g-MAH/EP is compounded with PVB for use, so that the high toughening effect with low addition amount is realized, and the toughening effect is realized from the physical dispersion layer.
(3) The accelerator adopts double-coated tertiary amine salt ionic liquid, the coating curing process firstly comprises the steps of thermally melting and sealing the outer polyethylene wax, secondly, deblocking the chitosan and the epoxy, and finally, directly reacting the tertiary amine salt with the epoxy, and performing multiple crosslinking curing by matching with a novel polyphenol curing system, so that the crosslinking density is greatly improved, and the mechanical property of the coating is very excellent; in addition, chitosan has another function purpose, and has good flame retardant effect by utilizing the high char formation performance during combustion.
(4) The insulating powder for flexible connection of the bus bar of the power battery has simple preparation process and stable product, is firstly applied to flexible connection insulation in the field of new energy power batteries, has comprehensive and leading performance in the technology of PVC sleeve, and opens up a brand new idea in the field and has wide market.
Detailed Description
For a further understanding of the present invention, reference will now be made to specific examples, which are not intended to be limiting.
In the invention, the curing agent is hexamethylimine modified polyhydric phenol, which is a novel phenol curing agent and is an independent development product of Jiangsu Jiangnan insulating powder Co. The accelerator is self-made double-coated tertiary amine salt ionic liquid 1- (propionic acid group) homopiperidine bisulfate. Leveling agents, antioxidants, defoamers, pigments and other auxiliary agents are routinely selected in the art, and other part of raw materials of the insulating powder are commercially available.
Example 1
The insulating powder for flexible connection of the bus bar of the power battery comprises the following raw materials in parts by weight:
base material A:50%, base material B:10%, base C:3% of pigment filler 34%, wherein the sum of various auxiliary agents accounts for 3%, and the using amount of the accelerator accounts for 1% of the total mass;
the base material A comprises two resins, namely semi-solid dimer acid modified epoxy resin, and the epoxy equivalent is 600-700 g/eq; the epoxy equivalent of the phenolic aldehyde-modified epoxy resin is 750-850 g/eq, and the mass ratio of the phenolic aldehyde-modified epoxy resin to the epoxy resin is 1:2;
the base material B is used as a curing agent of a formula system and adopts hexamethylimine modified polyphenol;
the base material C is a composite material of POE-g-MAH/EP and PVB with equal mass;
the preparation method of the insulating powder for flexible connection of the power battery busbar comprises the following steps:
(1) Preparing a base material A: taking a proper amount of semisolid dimeric acid modified epoxy resin, weighing 5% of white carbon black in parts by mass in a ball mill, and fully solidifying after ball milling, wherein the epoxy equivalent is 600-700 g/eq; adding a certain mass of phenolic aldehyde-modified epoxy resin into a ball mill, wherein the epoxy equivalent is 750-850 g/eq, the mass ratio of the two resins is 1:2, and continuing ball milling to obtain white powder;
(2) Preparing a base material C: taking POE with a certain mass, five thousandths of DCP with a mass part, MAH with a mass part of 2% and EP with a mass part of 3% and banburying in an internal mixer at 180 ℃ for 9min to prepare POE-g-MAH/EP, tabletting while the internal mixing is hot after finishing, cooling and crushing to obtain solid particles; then physically mixing PVB with equal parts by mass;
(3) Preparing an accelerator: preparing chitosan coated tertiary amine salt ionic liquid by an ionic gel method, then taking polyethylene wax as an outer coating shell, taking the chitosan coated tertiary amine salt ionic liquid as a core, and binding by a binding machine to obtain double coated tertiary amine salt ionic liquid which is milky white powder;
(4) Accurately weighing the products obtained in the steps (1), (2) and (3) according to the proportion, putting the products into a mixing cylinder, then adding corresponding parts of hexamethylimine modified polyphenol, pigment filler and other auxiliary agents except accelerator, and stirring for 7min at 800r/min to uniformly mix the products;
(5) Melt extruding the mixture obtained in the step (4) through a double screw, wherein the temperature of a melting section is 95 ℃, the extrusion temperature of a machine head is 100 ℃, and the screw is heated by adopting an oil bath; then tabletting, air cooling, crushing, air grading, granulating and sieving to obtain the finished product.
Various indexes are shown in table 1 after testing.
Example 2
The insulating powder for flexible connection of the bus bar of the power battery comprises the following raw materials in parts by weight: base material A:60%, base material B:12%, base C:5% of pigment filler 20% and 3% of the sum of various auxiliary agents, wherein the using amount of the accelerator is 2% of the total mass;
the preparation method of the insulating powder for flexible connection of the power battery busbar comprises the following steps:
(1) Preparing a base material A: taking a proper amount of semisolid dimeric acid modified epoxy resin, weighing 7% of white carbon black in parts by mass in a ball mill, and fully solidifying after ball milling, wherein the epoxy equivalent is 600-700 g/eq; adding a certain mass of phenolic aldehyde-modified epoxy resin into a ball mill, wherein the epoxy equivalent is 750-850 g/eq, the mass ratio of the two resins is 1:3, and continuing ball milling to obtain white powder;
(2) Preparing a base material C: taking POE with a certain mass, five thousandths of DCP with a mass part, 3% of MAH with a mass part and 5% of EP with a mass part, banburying in an internal mixer at 180 ℃ for 9min to prepare POE-g-MAH/EP, tabletting while the internal mixing is hot after finishing, cooling and crushing to obtain solid particles; then physically mixing PVB with equal parts by mass;
(3) Preparing an accelerator: preparing chitosan coated tertiary amine salt ionic liquid by an ionic gel method, then taking polyethylene wax as an outer coating shell, taking the chitosan coated tertiary amine salt ionic liquid as a core, and binding by a binding machine to obtain double coated tertiary amine salt ionic liquid which is milky white powder;
(4) Accurately weighing the products obtained in the steps (1), (2) and (3) according to the proportion, putting the products into a mixing cylinder, then adding corresponding parts of hexamethylimine modified polyphenol, pigment filler and other auxiliary agents except accelerator, and stirring for 7min at 900r/min to uniformly mix the products;
(5) Melt extruding the mixture obtained in the step (4) through a double screw, wherein the temperature of a melting section is 100 ℃, the extrusion temperature of a machine head is 105 ℃, and the screw is heated by adopting an oil bath; then tabletting, air cooling, crushing, air grading, granulating and sieving to obtain the finished product. Various indexes are shown in table 1 after testing.
Example 3
The procedure of example 1 is repeated except that the raw materials comprise (by weight parts) a base material A:55%, base material B:11%, base C:5% of pigment filler 24%, and 5% of the sum of various auxiliary agents, wherein the using amount of the accelerator is 4% of the total mass;
the preparation method is the same as in example 1.
Various indexes are shown in table 1 after testing.
Example 4
The insulating powder for flexible connection of the bus bar of the power battery comprises the following raw materials in parts by weight: base material A:50%, base material B:15%, base C:2% of pigment filler 25%, and 8% of the sum of various auxiliary agents, wherein the using amount of the accelerator is 2% of the total mass; the preparation method is the same as in example 1.
Example 5
The insulating powder for flexible connection of the bus bar of the power battery comprises the following raw materials in parts by weight: base material A:50%, base material B:10%, base C:2% of pigment filler 35%, and 3% of the sum of various auxiliary agents, wherein the using amount of the accelerator is 1% of the total mass; the preparation method is the same as in example 1.
Comparative example 1
An insulating powder was prepared in the same manner as in example 1 except that: the base material A is conventional solid epoxy resin with the epoxy equivalent: 950-1000 g/eq, and the dosage is 60%; the base material B is dicyandiamide which is a conventional curing agent, and the dosage is 4%; the base material C is not added; 33% of pigment and filler, 3% of the sum of various auxiliary agents, wherein the accelerator is conventional dimethyl imidazole, and the dosage is 1% of the total mass.
Various indexes are shown in table 1 after testing.
Comparative example 2
An insulating powder was prepared in the same manner as in example 1 except that: the base material A is conventional solid epoxy resin with the epoxy equivalent: 950-1000 g/eq, and the dosage is 55%; the base material B is dicyandiamide which is a conventional curing agent, and the dosage is 3.8 percent; base material C:5%; 33.2% of pigment and filler; the sum of the auxiliary agents accounts for 3%, wherein the accelerator is conventional dimethyl imidazole, and the dosage accounts for 1% of the total mass.
Various indexes are shown in table 1 after testing.
Comparative example 3
An insulating powder was prepared in the same manner as in example 1 except that: the base material A is conventional solid epoxy resin with the epoxy equivalent: 950-1000 g/eq, and the dosage is 55%; the base material B is dicyandiamide which is a conventional curing agent, and the dosage is 3.8 percent; base material C:5%; pigment and filler 31.2%; the sum of the auxiliary agents accounts for 5%, wherein the accelerator is the double-coated tertiary amine salt ionic liquid prepared by the method, and the dosage of the double-coated tertiary amine salt ionic liquid accounts for 4% of the total mass.
Various indexes are shown in table 1 after testing.
TABLE 1
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (6)
1. The insulating powder for flexible connection of the bus bar of the power battery is characterized by comprising the following raw materials in parts by weight:
base material A:50% -60%;
base material B:10% -15%;
base material C:2% -5%;
pigment and filler: 20% -35%;
auxiliary agent: 3% -8%; the sum of the weight of the components is 100 percent;
the base material A is a composite material of dimer acid modified epoxy resin and linear phenolic aldehyde modified epoxy resin;
the base material B is hexamethylimine modified polyhydric phenol;
the base material C is a composite material of ethylene-octene high polymer double-grafted maleic anhydride/epoxy resin and polyvinyl butyral;
the auxiliary agent is a mixture of a compatilizer, an accelerator, a leveling agent, an antioxidant, a defoaming agent and pigment;
the accelerator is double-coated tertiary amine salt ionic liquid 1- (propionic acid group) homopiperidine bisulfate.
2. The insulating powder for flexible connection of a busbar of a power battery according to claim 1, wherein: the preparation method of the base material A comprises the following steps: taking semi-solid dimer acid modified epoxy resin, weighing 5% -7% of white carbon black in parts by mass of the semi-solid dimer acid modified epoxy resin in a ball mill, and fully solidifying the semi-solid dimer acid modified epoxy resin after ball milling; and then adding the phenolic aldehyde-modified epoxy resin into a ball mill, wherein the epoxy equivalent is 750-850 g/eq, the mass ratio of the two resins is 1:2-1:3, and continuing ball milling to obtain white powder.
3. The insulating powder for flexible connection of a busbar of a power battery according to claim 1, wherein: the preparation method of the base material C comprises the following steps: taking maleic anhydride and epoxy resin as co-grafting monomers, activating an elastomer ethylene-octene high polymer by peroxide, and preparing the ethylene-octene high polymer double-grafting maleic anhydride/epoxy resin by a melting method in an internal mixer; and then taking the polyvinyl butyral with the same mass parts for physical mixing.
4. The insulating powder for flexible connection of a busbar of a power battery according to claim 1, wherein: the accelerator is double-coated tertiary amine salt ionic liquid 1- (propionic acid group) homopiperidine bisulfate, and the preparation method comprises the following steps: firstly preparing chitosan coated tertiary amine salt ionic liquid by using an ionic gel method, then using polyethylene wax as an outer coating shell, using chitosan coated tertiary amine salt ionic liquid as a core, and using a bonding machine for binding treatment to finally obtain the double-coating tertiary amine salt ionic liquid.
5. A method of producing the insulating powder according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
(1) Preparing a base material A: taking semi-solid dimer acid modified epoxy resin, wherein the epoxy equivalent is 600-700 g/eq, weighing 5-7% of white carbon black in parts by mass in a ball mill, fully solidifying the white carbon black after ball milling, then adding novolac modified epoxy resin into the ball mill, and obtaining white powder after ball milling, wherein the epoxy equivalent is 750-850 g/eq and the mass ratio of the two resins is 1:2-1:3;
(2) Preparing a base material C: taking a certain mass of ethylene-octene high polymer, five thousandths of dicumyl peroxide in mass parts, 2% -3% of maleic anhydride in mass parts and 3% -5% of epoxy resin in mass parts, banburying for 9min at 180 ℃ in an internal mixer to prepare ethylene-octene high polymer double-grafted maleic anhydride/epoxy resin, tabletting the ethylene-octene high polymer double-grafted maleic anhydride/epoxy resin after banburying is finished, cooling and crushing the ethylene-octene high polymer double-grafted maleic anhydride/epoxy resin to obtain solid particles, and then taking the polyvinyl butyral with equal mass parts of the solid particles for physical mixing;
(3) Preparing an accelerator: preparing chitosan coated tertiary amine salt ionic liquid by an ionic gel method, then using polyethylene wax as an outer coating shell, using the chitosan coated tertiary amine ionic liquid as a core, and binding by a binding machine to obtain double coated tertiary amine salt ionic liquid which is milky white powder;
(4) Accurately weighing the products obtained in the steps (1), (2) and (3) according to a proportion, putting the products into a mixing cylinder, then adding corresponding parts of hexamethylimine modified polyphenol, pigment filler and other auxiliary agents except accelerator, and stirring for 7min at 800-900 r/min to uniformly mix the products;
(5) Melt extruding the mixture obtained in the step (4) through a double screw, wherein the temperature of a melting section is 95-100 ℃, the extrusion temperature of a machine head is 100-105 ℃, and the screw is heated by adopting an oil bath; then tabletting, air cooling, crushing, air grading, granulating and sieving to obtain the finished product.
6. The method for producing an insulating powder according to claim 5, wherein the pigment filler is spherical silica of 3000 to 5000 mesh.
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| CN110194923A (en) * | 2019-07-02 | 2019-09-03 | 江苏江南绝缘粉末有限公司 | A kind of cold-hot sudden turn of events insulating powder and preparation method thereof |
| CN111187560A (en) * | 2020-04-01 | 2020-05-22 | 江苏江南绝缘粉末有限公司 | Ultrahigh-voltage flame-retardant insulating powder for outdoor busbar and preparation method thereof |
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| CN110194923A (en) * | 2019-07-02 | 2019-09-03 | 江苏江南绝缘粉末有限公司 | A kind of cold-hot sudden turn of events insulating powder and preparation method thereof |
| CN111187560A (en) * | 2020-04-01 | 2020-05-22 | 江苏江南绝缘粉末有限公司 | Ultrahigh-voltage flame-retardant insulating powder for outdoor busbar and preparation method thereof |
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