CN112898871A - Insulating powder coating and application thereof - Google Patents

Insulating powder coating and application thereof Download PDF

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Publication number
CN112898871A
CN112898871A CN202110106033.4A CN202110106033A CN112898871A CN 112898871 A CN112898871 A CN 112898871A CN 202110106033 A CN202110106033 A CN 202110106033A CN 112898871 A CN112898871 A CN 112898871A
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Prior art keywords
insulating
powder coating
insulating powder
agent
mass
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Inventor
黄利明
李开波
陈星宇
何巍
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Hubei Eve Power Co Ltd
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Hubei Eve Power Co Ltd
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Priority to CN202110106033.4A priority Critical patent/CN112898871A/en
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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
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • 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
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
    • 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
    • C09D5/03—Powdery paints
    • C09D5/033—Powdery paints characterised by the additives
    • C09D5/037—Rheology improving agents, e.g. flow control agents
    • 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
    • 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
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • 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
    • C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides an insulating powder coating and application thereof, wherein the insulating powder coating comprises an insulating agent, a flame retardant, a heat conducting agent, a curing agent and a leveling agent; the heat conducting agent comprises any one or the combination of at least two of titanium dioxide, silicon dioxide, boron carbide or silicon nitride; the leveling agent comprises a polymer of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid. All substances in the insulating powder coating are matched with each other, so that an insulating layer formed by the insulating powder coating has good insulating property, flame retardant property and heat dissipation property; the insulating powder has good adhesion with the battery shell, can endure a long-term high-temperature high-humidity environment, and solves the problems of unreliable adhesion between the insulating film and the battery shell in the prior art.

Description

Insulating powder coating and application thereof
Technical Field
The invention relates to the technical field of batteries, in particular to an insulating powder coating and application thereof.
Background
The battery plays a unique role in the fields of electronic equipment, new energy automobiles and the like, and the service life and the safety performance of the battery are influenced not only by electrode materials, but also by the structure and the performance of a battery shell, particularly the insulation performance. In order to prevent safety problems such as scratching or short-circuiting of the surface of the battery case, an insulating layer is generally provided on the surface of the battery case.
At present, the battery surface insulating layer is mainly arranged in the following two ways: one is to stick insulating film such as PET on the outer surface of the battery case after the battery is assembled, and the second is to coat insulating resin material on the battery surface.
CN207664159U discloses a power battery shell insulation packaging structure, including battery shell and the insulating film of cladding at the battery shell surface, the insulating film includes end package tectorial membrane, two main package tectorial membranes, two assistance coating films and top coating film, the insulating film carries out the complete cladding to battery shell, and further inject the insulating film is PET membrane, PI membrane, PP membrane, PBT membrane, PVC membrane or PPS membrane, the insulating film is through the rubberizing mode with battery shell's surface bonding fixed.
However, the patent has the following drawbacks and disadvantages: (1) the insulating film is easy to generate bubbles in the application process, and under the high-voltage use condition, the air in the bubbles is ionized and punctured into the insulating film such as a PET film: (2) under a long-term high-temperature and high-humidity environment, moisture is easy to permeate between the battery shell and insulating films such as a PET film and the like, so that the viscosity of glue is reduced, the insulating films such as the PET film and the like are peeled off, and the insulation fails; (3) the surface of the battery shell is pasted with insulating films such as a PET film, a large amount of labor is consumed, and the economic requirement is not met.
CN107326422A discloses a preparation method of a composite insulating layer on the surface of an aluminum alloy battery shell, which comprises the following steps: (1) cleaning the surface of the aluminum alloy battery shell by using a cleaning agent to remove oil stains and finish the pretreatment of the surface of the aluminum alloy battery shell; (2) preparing a micro-arc oxidation ceramic layer on the surface of the aluminum alloy battery shell obtained after the pretreatment in the step (1); (3) and (3) mixing polymethylphenyl organic silicon resin with absolute ethyl alcohol to obtain organic silicon resin spraying liquid, spraying and curing the micro-arc oxidation ceramic layer obtained in the step (2) by using the organic silicon resin spraying liquid, and preparing the composite insulating layer on the aluminum alloy battery shell. However, the micro-arc oxidation ceramic layer has a problem of uneven thickness at non-planar positions such as corners of the battery case.
CN103078067A discloses an insulating protective layer of a lithium ion battery metal shell and a manufacturing method thereof, wherein an opening part of the shell is 1-10 mm in size and is an oxidation protective layer, the rest part of the shell is an oxidation layer, and after the opening part of the oxidation protective layer is welded and sealed, the outer layer of the shell is coated with a colloid insulating layer. Although the potential safety hazard caused by the electrification of the metal shell of the lithium ion battery can be effectively prevented, the colloid insulating layer is coated after the battery is assembled, and whether the parts sensitive to temperature, such as electrolyte, a diaphragm and the like in the battery are suitable for secondary heating or not needs to be considered during curing; if the colloid insulating layer is cured in an air-drying mode, the adhesive force between the colloid insulating layer and the battery shell is poor, the colloid insulating layer cannot endure a long-term high-temperature high-humidity environment, and the insulating layer is easy to peel.
In addition, after the battery is assembled, the current collecting terminal needs to be protected before the construction of coating the insulating layer on the surface of the battery, and if the current collecting terminal is protected by the insulating tape, the colloid may leak into the insulating tape to pollute the current collecting terminal.
CN104115301A discloses a casing for battery cells, having a lacquer coating (111) for electrical insulation, wherein the lacquer coating (111) comprises particles (114) containing a binder, which binder is activatable under certain conditions, preferably by pressure, when clamping a plurality of battery cells with such a casing (100), thereby increasing the coefficient of friction of the contact surfaces of the casing. Although the invention can meet the insulation requirement of the battery shell, the invention does not state how the surface of the battery shell is coated with the insulation layer, and the clamp for bearing the battery should apply force on which part of the battery to ensure that the outer surface of the battery can be coated with the insulation layer, thereby being lack of operability.
Based on the research of the prior art, how to improve the adhesion between the insulating layer of the battery shell and the battery shell, which can be suitable for high-temperature and high-humidity environment for a long time, and develop a method which has strong operability and is not limited by the curing temperature of the insulating layer, become the technical problems to be solved at present.
Disclosure of Invention
The invention aims to provide an insulating powder coating and application thereof, wherein all substances in the insulating powder coating are matched with each other, so that an insulating layer formed by the insulating powder coating has good insulating property, flame retardant property and heat dissipation property; when the insulating powder coating is used for forming an insulating layer of a battery shell, the obtained insulating layer has good adhesive force with the outer surface of the battery shell, can resist high-temperature and high-humidity environments, and overcomes the defects of sticking insulating films such as PET (polyethylene terephthalate) on the surface of the battery shell in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an insulating powder coating including an insulating agent, a flame retardant, a heat conductive agent, a curing agent, and a leveling agent.
The heat conducting agent comprises any one or the combination of at least two of titanium dioxide, silicon dioxide, boron carbide or silicon nitride.
The leveling agent comprises a polymer of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid.
In the present invention, among the heat-conducting agents, there are typically, but not restrictively, the following combinations: combinations of titanium dioxide and boron carbide, silicon nitride and boron nitride, silicon dioxide and titanium dioxide, silicon dioxide and boron nitride, and the like.
According to the insulating powder coating provided by the invention, at least one of titanium dioxide, silicon dioxide, boron carbide or silicon nitride is used as a heat conducting agent, the heat conducting agent has excellent heat conducting property and good insulating property, and polymers of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid are used as leveling agents, so that the dispersion of insulating materials can be effectively balanced, the insulating components are kept uniformly dispersed on the surface of a formed paint film, and the paint film with uniform thickness is formed; all substances in the insulating powder coating are matched with each other, so that an insulating layer formed by the insulating powder coating has good insulating property, flame retardant property and heat dissipation property.
Preferably, the insulating agent comprises any one of, or a combination of at least two of, epoxy, polyester or phenolic resins, typically but not limited to: a combination of an epoxy resin and a phenolic resin, a combination of an epoxy resin and a polyester resin, a combination of a phenolic resin and a polyester resin, or a combination of an epoxy resin, a polyester resin and a phenolic resin, preferably an epoxy resin and/or a polyester resin.
The insulating powder coating disclosed by the invention can ensure the insulating strength and high-voltage resistance of the insulating layer by adding the insulating agent.
Preferably, the content of the insulating agent is 35-90% by mass, for example 35%, 40%, 50%, 60%, 70%, 80% or 90% by mass based on 100% by mass of the insulating powder coating, but not limited to the recited values, and other values not recited in the numerical range are also applicable; preferably 40 to 70%.
Preferably, the insulating agent is a combination of epoxy resin and polyester resin, the mass percentage content of the epoxy resin is 30-60% based on 100% of the mass of the insulating powder coating, for example, 30%, 35%, 40%, 45%, 50%, 55% or 60%, but not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable, preferably 40-60%; the phenolic resin may be present in an amount of 5-30% by weight, for example 5%, 10%, 15%, 20%, 25% or 30% by weight, but is not limited to the recited values, and other values not recited within the numerical range are equally applicable, preferably 15-30%.
Preferably, the flame retardant comprises an inorganic flame retardant.
Preferably, the inorganic flame retardant comprises silica and/or aluminium hydroxide, preferably silica.
The silicon dioxide in the invention can be used as a flame retardant and a heat conducting agent. When the flame retardant and the heat conducting agent are both silicon dioxide, the adhesive force of the insulating layer formed on the surface of the battery shell can be improved due to uniform particle size.
Preferably, the mass ratio of the flame retardant to the heat conducting agent is (0.5-3):1, and may be, for example, 0.5:1, 1:1, 1.5:1, 2:1, 2.5:1 or 3:1, but is not limited to the recited values, and other values within the range of values are also applicable, and are preferably (1-2): 1.
Preferably, the sum of the mass percentages of the flame retardant and the heat conducting agent is 3-20%, for example 3%, 5%, 10%, 15%, 18% or 20%, based on 100% by mass of the insulating powder coating, but not limited to the cited values, and other values not listed in the range of values are equally applicable, preferably 5-15%.
Preferably, the curing agent comprises at least one of a phenolic resin or a low molecular polyamide; preferably low-molecular polyamide with the number-average molecular weight of 17000-21000; .
In a preferred embodiment of the present invention, the number average molecular weight of the low molecular weight polyamide is 17000-21000, for example 17000, 18000, 19000, 20000 or 21000, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the curing agent is present in an amount of 10-20% by mass, for example 10%, 12%, 15%, 18% or 20% by mass, based on 100% by mass of the insulating powder coating, but not limited to the recited values, and other values within the range of values not recited are equally applicable, preferably 12-18%;
preferably, the content of the leveling agent is 5-30% by mass, for example, 5%, 10%, 15%, 20%, 25% or 30% by mass, based on 100% by mass of the insulating powder coating, but not limited to the recited values, and other values not recited in the numerical range are equally applicable, preferably 10-25%.
In a second aspect, the present invention provides the use of an insulating powder coating as described in the first aspect for insulating layers on the outer surface of a battery housing.
Preferably, the material of the battery case includes metal or alloy, preferably aluminum or steel.
Preferably, the shape of the battery case includes a square or a circle.
Preferably, the insulating powder coating is sprayed on the outer surface of the battery shell to form the insulating layer.
Preferably, the spraying method is electrostatic powder spraying.
Before the battery is assembled, the insulating powder coating is sprayed on the outer surface of the battery shell by adopting an electrostatic powder spraying method to form an insulating layer, so that the adhesive force between the insulating layer and the battery shell is good, the battery shell can endure a long-term high-temperature high-humidity environment, the problems that in the prior art, insulating films such as PET (polyethylene terephthalate) are adhered on the surface of the battery shell, the adhesion between the insulating films and the battery shell is unreliable and the like are solved, and the problem that the curing of the insulating layer is limited by the temperature-resistant range of electrolyte, a diaphragm and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) in the insulating powder coating provided by the invention, at least one of titanium dioxide, silicon dioxide, boron carbide or silicon nitride is used as a heat-conducting agent, the heat-conducting agent has both heat-conducting property and insulating property, and polymers of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid are used as leveling agents, so that the fluidity of the insulating powder coating is improved; all substances in the insulating powder coating are matched with each other, so that an insulating layer formed by the insulating powder coating has good insulating property, flame retardant property and heat dissipation property;
(2) the insulating powder coating provided by the invention is sprayed on the outer surface of the battery shell before the battery is assembled, and the insulating layer is formed on the outer surface of the battery shell, so that the obtained insulating layer has good adhesive force with the battery shell, can endure a long-term high-temperature and high-humidity environment, solves the problems that the adhesion between the insulating layer and the battery shell is not reliable and the like in the prior art, and simultaneously solves the problem that the curing of the insulating layer is limited by the temperature tolerance range of electrolyte, a diaphragm and the like in the battery.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The present embodiment provides an insulating powder coating comprising:
based on 100% of the insulating powder coating, the mass percentage of the epoxy resin (insulating agent) is 35%, the mass ratio of the silicon dioxide (flame retardant) to the titanium dioxide (heat conducting agent) is 0.5:1, the total mass percentage of the silicon dioxide and the titanium dioxide is 20%, the mass percentage of the phenolic resin (curing agent) is 25%, and the mass percentage of the polymer (leveling agent) of phenol, formaldehyde and glycidyl ether is 20%.
Example 2
The present embodiment provides an insulating powder coating comprising:
based on 100% of the insulating powder coating, the mass percentage of the epoxy resin (insulating agent) is 65%, the mass ratio of the silicon dioxide (flame retardant) to the titanium dioxide (heat conducting agent) is 1.5:1, the total mass percentage of the silicon dioxide and the titanium dioxide is 10%, the mass percentage of the phenolic resin (curing agent) is 20%, and the mass percentage of the polymer of phenol, formaldehyde and glycidyl ether (leveling agent) is 5%.
Example 3
The present embodiment provides an insulating powder coating comprising:
by taking the mass of the insulating powder coating as 100%, the mass percentage of the polyester resin (insulating agent) is 90%, the mass ratio of silicon dioxide (flame retardant) to titanium dioxide (heat conducting agent) is 3:1, the total mass percentage of the silicon dioxide and the titanium dioxide is 3%, the mass percentage of the phenolic resin (curing agent) is 1%, and the mass percentage of the polymer of phenol, formaldehyde and glycidyl ether (leveling agent) is 6%.
Example 4
The present embodiment provides an insulating powder coating comprising:
the mass percentage of the epoxy resin (insulating agent) is 30%, the mass percentage of the phenolic resin (insulating agent) is 25%, the mass ratio of silicon dioxide (flame retardant) to titanium dioxide (heat conducting agent) is 1:1, the total mass percentage of the silicon dioxide and the titanium dioxide is 11%, the curing agent is polyamide with the number average molecular weight of 21000, the mass percentage of the curing agent is 4%, and the mass percentage of the polymer (flatting agent) of phenol, formaldehyde and glycidyl ether is 30%, wherein the insulating powder coating is 100%.
Example 5
The present embodiment provides an insulating powder coating comprising:
the mass percentage of the epoxy resin (insulating agent) is 60%, the mass percentage of the phenolic resin (insulating agent) is 5%, the mass ratio of silicon dioxide (flame retardant) to titanium dioxide (heat conducting agent) is 2:1, the total mass percentage of the silicon dioxide and the titanium dioxide is 20%, the curing agent is polyamide with the number average molecular weight of 17000, the mass percentage of the curing agent is 4%, and the mass percentage of the polymer (flatting agent) of phenol, formaldehyde and glycidyl ether is 11%, wherein the insulating powder coating is 100%.
Example 6
This example provides an insulating powder coating, and differs from example 4 in that this example replaces the heat conductive agent with silicon nitride from titanium dioxide or the like.
Example 7
This example provides an insulating powder coating, and differs from example 4 in that this example replaces the heat conductive agent with boron nitride in terms of mass of titanium dioxide or the like.
Example 8
This example provides an insulating powder coating, differing from example 4 in that this example replaces the quality of the insulating agent phenolic resin or the like with a polyester resin.
Example 9
This example provides an insulating powder coating, which differs from example 8 in that the mass percentage of the epoxy resin (insulating agent) is adjusted to 40% and the mass percentage of the polyester resin (insulating agent) is adjusted to 15%.
Example 10
This example provides an insulating powder coating, which differs from example 1 in that the present example replaces the mass ratio of silicon dioxide (flame retardant) to titanium dioxide (heat conductive agent) with 1: 1.
Example 11
This example provides an insulating powder coating, which differs from example 1 in that this example replaces the mass ratio of silicon dioxide (flame retardant) to titanium dioxide (heat conductive agent) with 2: 1.
Comparative example 1
This comparative example provides an insulating powder coating, which is different from example 1 in that a heat conductive agent is not added to the insulating powder coating provided by this comparative example, and the addition amounts of the remaining substances are kept constant.
Comparative example 2
The present comparative example provides an insulating powder coating, which is different from example 1 in that no leveling agent is added to the insulating powder coating provided by the present comparative example, and the addition amounts of the remaining substances are kept unchanged.
Application example 1
The application example provides a preparation method of a battery shell with an insulating layer on the outer surface, and the method comprises the following steps:
(1) performing punctiform laser surface layer reconstruction on the circular steel shell, wherein the laser power of the punctiform laser surface layer reconstruction is 20W, the depth of the surface layer reconstruction is 5 mu m, then performing flame plasma treatment under the conditions that the power is 0.4kW and the frequency is 1000Hz, and heating the surface of the circular steel shell to 60 ℃;
(2) and (2) fixing the outer surface of the steel shell at a position 2mm downwards from the opening of the outer surface by using a sealing clamp, spraying the insulating powder coating obtained in the example 1 by adopting an electrostatic powder spraying method, controlling the powder spraying amount to be 50g/min, the spraying distance to be 120cm, the voltage to be 6kV and the time to be 3min, curing for 15min at 200 ℃, and coating a PET protective film with the thickness of 0.05mm to obtain the battery shell.
In the battery case obtained in this application example, the thickness of the insulating layer was 150 μm.
Application example 2
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 2.
Application example 3
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 3.
Application example 4
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 4.
Application example 5
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 5.
Application example 6
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 6.
Application example 7
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 7.
Application example 8
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 8.
Application example 9
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 9.
Application example 10
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 10.
Application example 11
This application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in example 11.
Comparative application example 1
This comparative application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in comparative example 1.
Comparative application example 2
This comparative application example provides a method for producing a battery case having an insulating layer on the outer surface, which is different from application example 1 in that the insulating powder coating obtained in example 1 in step (2) is replaced with the same amount of the insulating powder coating obtained in comparative example 2.
The battery cases provided in application examples 1 to 11 and comparative application examples 1 to 2 were tested for adhesion, insulation, thermal conductivity, and flame retardancy according to the following test methods:
the adhesion test method comprises the following steps: the test is carried out by referring to the national standard GB/T9286-1998 grid test for paint films of colored paint and varnish, and the evaluation grade is 5B: no peeling, 4B: the peeling area is less than 5 percent, and the 3B peeling area is 5 to 15 percent.
Insulation value: according to the requirement of customers, the insulation resistance is more than 20M omega under the condition of 500 VDC. The specific operation method comprises the following steps: 500VDC voltage is applied to the surface of the paint film, the metal plate is grounded, and the insulation resistance is tested.
The thermal conductivity is referenced to the standard test method for heat transfer characteristics of ASTM D5470 thin thermally conductive solid electrical insulation.
50J impact test: refer to GB/T1732-93 determination of paint film impact resistance.
The test results are shown in table 1.
TABLE 1
Figure BDA0002917692710000121
Figure BDA0002917692710000131
As can be seen from Table 1, the insulating layer obtained by using the insulating powder of the present invention has good insulating properties and thermal conductivity, and is convenient to form good adhesion properties and impact resistance, and the battery case, in which the insulating layer obtained by the spraying method of the present invention is subjected to surface reconstruction and/or surface dust removal, has good adhesion properties and impact resistance.
Comparing application example 4 with application examples 6 and 7, it is clear that the difference in performance of the heat conductive agent defined in the present invention is not large.
Comparing application example 4 with application examples 8 and 9, it can be seen that the insulating layer obtained by combining the phenolic resin and the epoxy resin has higher insulating performance compared with the combination of the polyester resin and the epoxy resin; and is more favorable for obtaining an insulating layer with better adhesive capacity and shock resistance.
Comparing application example 4 with comparative application example 1, the insulating layer formed from the insulating powder provided in comparative example 1 was poor in adhesion, thermal conductivity and impact resistance because titanium dioxide was not added to the insulating powder as a thermal conductive material.
Comparing application example 4 with comparative application example 2, the insulating layer formed from the insulating powder provided in comparative example 2 was poor in adhesion, thermal conductivity and impact resistance because no leveling agent was added to the insulating powder.
In summary, in the insulating powder coating provided by the invention, at least one of titanium dioxide, silicon dioxide, boron carbide or silicon nitride is used as a heat conducting agent, the heat conducting agent has both heat conducting performance and insulating performance, and polymers of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid are used as leveling agents, so that the fluidity of the insulating powder coating is improved; all substances in the insulating powder coating are matched with each other, so that an insulating layer formed by the insulating powder coating has good insulating property, flame retardant property and heat dissipation property; the insulating powder coating provided by the invention is sprayed on the outer surface of the battery shell before the battery is assembled, and the insulating layer is formed on the outer surface of the battery shell, so that the obtained insulating layer has good adhesive force with the battery shell, can endure a long-term high-temperature and high-humidity environment, solves the problems that the adhesion between the insulating layer and the battery shell is not reliable and the like in the prior art, and simultaneously solves the problem that the curing of the insulating layer is limited by the temperature tolerance range of electrolyte, a diaphragm and the like in the battery.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. The insulating powder coating is characterized by comprising an insulating agent, a flame retardant, a heat conducting agent, a curing agent and a leveling agent;
the heat conducting agent comprises any one or the combination of at least two of titanium dioxide, silicon dioxide, boron carbide or silicon nitride;
the leveling agent comprises a polymer of phenol, formaldehyde and glycidyl ether and/or polyacrylic acid.
2. The insulating powder coating according to claim 1, wherein the insulating agent comprises any one of epoxy resin, polyester resin or phenolic resin or a combination of at least two thereof, preferably epoxy resin and/or polyester resin.
3. The insulating powder coating according to claim 1 or 2, wherein the mass percentage of the insulating agent is 35-90%, preferably 40-70%, based on 100% by mass of the insulating powder coating;
preferably, the insulating agent is a combination of epoxy resin and polyester resin, and the mass percentage of the epoxy resin is 30-60% and the mass percentage of the phenolic resin is 5-30% based on 100% of the insulating powder coating.
4. The insulating powder coating according to claim 3, wherein the mass percentage of the epoxy resin is 40 to 60% and the mass percentage of the phenolic resin is 15 to 30% based on 100% by mass of the insulating powder coating.
5. The insulating powder coating according to any one of claims 1 to 4, wherein the flame retardant comprises an inorganic flame retardant;
preferably, the inorganic flame retardant comprises silica and/or aluminium hydroxide, preferably silica.
6. The insulating powder coating according to any one of claims 1 to 5, characterized in that the mass ratio of flame retardant to heat conducting agent is (0.5-3) to 1, preferably (1-2) to 1;
preferably, the sum of the mass percentages of the flame retardant and the heat conducting agent is 3-20%, preferably 5-15%, based on 100% by mass of the insulating powder coating.
7. The insulating powder coating of any one of claims 1-6, wherein the curing agent comprises at least one of a phenolic resin or a low molecular polyamide; preferably low-molecular polyamide with the number-average molecular weight of 17000-21000;
preferably, the mass percentage of the curing agent is 10-20%, preferably 12-18% based on 100% of the mass of the insulating powder coating;
preferably, the content of the leveling agent is 5-30% by mass, preferably 10-25% by mass, based on 100% by mass of the insulating powder coating.
8. Use of an insulating powder coating according to any one of claims 1 to 7 for the outer surface insulating layer of a battery housing.
9. Use according to claim 8, wherein the material of the battery case comprises a metal or alloy, preferably aluminium or steel;
preferably, the shape of the battery case includes a square or a circle.
10. Use according to claim 8 or 9, characterized in that the insulating powder coating is sprayed onto the outer surface of the battery casing, forming the insulating layer.
CN202110106033.4A 2021-01-26 2021-01-26 Insulating powder coating and application thereof Pending CN112898871A (en)

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