CN116844758A - New energy automobile battery cell mica insulation material and preparation method and application thereof - Google Patents
New energy automobile battery cell mica insulation material and preparation method and application thereof Download PDFInfo
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- CN116844758A CN116844758A CN202310932294.0A CN202310932294A CN116844758A CN 116844758 A CN116844758 A CN 116844758A CN 202310932294 A CN202310932294 A CN 202310932294A CN 116844758 A CN116844758 A CN 116844758A
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- 239000010445 mica Substances 0.000 title claims abstract description 58
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 58
- 239000012774 insulation material Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 48
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 239000004744 fabric Substances 0.000 claims abstract description 30
- 239000011521 glass Substances 0.000 claims abstract description 30
- 239000000741 silica gel Substances 0.000 claims abstract description 29
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000011810 insulating material Substances 0.000 claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 17
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 229920002635 polyurethane Polymers 0.000 claims abstract description 15
- 239000004814 polyurethane Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 11
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000011325 microbead Substances 0.000 claims abstract description 9
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000004005 microsphere Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 16
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 18
- 239000000463 material Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000004636 vulcanized rubber 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
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/02—Drying; Impregnating
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/025—Other inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the field of new energy batteries, and particularly discloses a new energy automobile battery cell mica insulation material, a preparation method and application thereof. The mica insulation material for the battery cell of the new energy automobile comprises the following raw materials in parts by weight: 10-52 parts of treatment fluid, 8-14 parts of silica hollow microbead powder, 10-16 parts of magnesium hydroxide powder and 30-60 parts of polyurethane adhesive, wherein the treatment fluid comprises mica powder, organic silica gel and alkali-free glass cloth short fibers; the preparation method comprises the following steps: weighing mica powder, high-temperature-resistant organic silica gel and alkali-free glass cloth short fibers, mixing, adding a silane coupling agent, and stirring and mixing to obtain an insulating treatment liquid; and heating the insulating treatment liquid to 50-70 ℃, adding the hollow silica microbead powder, the magnesium hydroxide powder and the polyurethane adhesive, and stirring to obtain the mixed liquid of the insulating material. The composition provided by the application can be used for filling gaps among cells of a new energy battery, and has the advantages of good insulation, heat insulation and impact resistance.
Description
Technical Field
The application relates to the field of new energy batteries, in particular to a mica insulation material for a battery cell of a new energy automobile, and a preparation method and application thereof.
Background
With the rapid development of new energy automobile industry, the power battery is used as a main power source of new energy, and the energy density of the power battery is continuously improved. In order to further meet the requirements on cruising ability, higher requirements are put forward on the integration of the battery cells of the battery pack, the design scheme is that the battery modules are integrated to the chassis from no modules, the space utilization rate of the battery cells is higher and higher, and meanwhile, the thermal runaway management between the battery cells is more important.
The battery pack of the new energy automobile in the current market is mainly a cylindrical battery cell, and the battery pack is integrated through the cylindrical battery cell and then used as a power source of the new energy automobile. In the charge and discharge process of the battery cells, the lithium ions are inserted into and separated from the electrode active materials to cause expansion and contraction of the battery cells, so that a certain gap is reserved between the battery cells, and buffer materials are filled in the gap to compensate the thermal expansion of the battery cells, so that the stress and deformation between the battery cells are reduced, and the structural stability and the service life of the battery pack are improved. The arrangement of the buffer material can also obstruct the conduction of electrons and ions between the electric cores, reduce the risk of electric short circuit between the electric cores and improve the safety of the battery pack.
In order to facilitate filling of the buffer material, the square modules are arranged in rows, but the shape of the square modules limits the tight arrangement among the cells, and further reduces the space utilization rate of the cells.
Therefore, the filling of the buffer material in the prior art can affect the space utilization rate of the battery cell, and limit the further improvement of the energy density of the battery pack.
Disclosure of Invention
In order to improve the safety of a battery pack and maximally improve the space utilization rate of a battery cell, the application provides a new energy automobile battery cell mica insulation material and a preparation method and application thereof.
The application provides a new energy automobile battery cell mica insulation material, which adopts the following technical scheme:
in a first aspect, the application provides a new energy automobile battery cell mica insulation material, which adopts the following technical scheme: the mica insulation material for the battery cell of the new energy automobile comprises the following raw materials in parts by weight: 10-52 parts of treatment fluid, 8-14 parts of silica hollow microsphere powder, 10-16 parts of magnesium hydroxide powder and 30-60 parts of polyurethane adhesive, wherein the treatment fluid comprises mica powder, organic silica gel and alkali-free glass cloth short fibers.
By adopting the technical scheme, the treatment solution consisting of mica powder, organic silica gel and alkali-free glass cloth short fibers has good high temperature resistance and insulation performance, the added silica hollow microbead powder can be attached to the surface of the alkali-free glass cloth short fibers to generate a crosslinking effect, so that the impact strength of the material is improved, the silica hollow microbead powder has the characteristic of low density, the density of the material can be reduced, the weight is reduced, the silica with a spherical structure has good fluidity in the organic silica gel and polyurethane adhesive, the system viscosity is reduced, and the operation of the insulation material in filling and sealing is facilitated; the silica hollow microbead powder can form continuous cavity structure in the system to separate heat transfer in the material, so that the heat conductivity coefficient of the insulating material is reduced, the problems of overheating and uneven temperature of the battery caused by heat transfer between the electric cores are prevented, and the heat resistance of the insulating material is further improved. The polyurethane adhesive is added to help the adhesion of powder materials such as mica powder, silica hollow microsphere powder and the like, and to help the formation of an insulating layer with good sealing performance, so that the insulating material has good insulating performance.
Optionally, the weight ratio of the mica powder to the organic silica gel to the alkali-free glass cloth short fiber is 90-92:4-6: 3 to 5.
By adopting the technical scheme, when the weight ratio of the mica powder to the organic silica gel to the alkali-free glass cloth short fiber is 90-92:4-6: 3-5, and the added alkali-free glass cloth fiber has better strength and toughness of the reinforced material, and improves the tensile resistance of the material, when the proportion exceeds the range, the insulation material cannot form an effective insulation layer, cannot be cured and formed, the adhesion between raw materials is poor, and the prepared insulation material has poor strength and toughness.
Optionally, the treatment fluid further comprises a silane coupling agent, wherein the silane coupling agent accounts for 0.1% -0.3% of the treatment fluid.
By adopting the technical scheme, the silane coupling agent can improve the surface wettability of the material, and can be added as a tackifier to improve the bonding strength of the alkali-free glass cloth short fiber and the mica powder, so that a chemical bond with higher strength is formed at a bonding interface, and all the components can be bonded together better. Meanwhile, the existence of the silane coupling agent can modify magnesium hydroxide and the like added later, so that the dispersibility and compatibility of the powder raw material in the insulating treatment liquid are improved.
Optionally, the organic silica gel is high-temperature-resistant organic silica gel, the solid content of the organic silica gel is more than 60%, and the organic silica gel is resistant to 270 ℃.
By adopting the technical scheme, the high-temperature-resistant organic silica gel with the solid content of more than 60 percent and the temperature resistance of 270 ℃ is selected for preparing the battery cell insulating material, and good high-temperature resistance, insulating property, chemical resistance and ageing resistance can be provided, so that the safety and reliability of the battery are improved.
Optionally, the particle size of the alkali-free glass cloth short fiber is 5000-8000 meshes.
By adopting the technical scheme, the added alkali-free glass cloth short fibers have better compatibility with other reactants, the tensile strength of the material is greatly improved, the tensile strength of the insulating material can be reduced when the alkali-free glass cloth short fibers smaller than 5000 meshes are selected, and the surface of a finished product can be rough when the tensile strength exceeds 8000 meshes, so that cracks appear, and the insulating material is unfavorable for insulation.
In a second aspect, the application provides a preparation method of a new energy automobile battery cell mica insulation material, which adopts the following technical scheme:
a preparation method of a new energy automobile battery cell mica insulation material comprises the following steps:
(1) Preparing a treatment fluid: weighing mica powder, high-temperature-resistant organic silica gel and alkali-free glass cloth short fibers, mixing, adding a silane coupling agent, and stirring and mixing to obtain an insulating treatment liquid;
(2) And heating the insulating treatment liquid to 50-70 ℃, adding the hollow silica microbead powder, the magnesium hydroxide powder and the polyurethane adhesive, and stirring to obtain the mixed liquid of the insulating material.
By adopting the technical scheme, the insulating treatment liquid is prepared by uniformly mixing the mica powder, the high-temperature-resistant organic silica gel and the alkali-free glass cloth short fibers, the organic silica gel and the polyurethane adhesive can have better compatibility when heated to 50-70 ℃, and other fillers are added at the moment to be beneficial to the full reaction of the raw materials, so that the insulating material with better insulating property and heat resistance is obtained.
Preferably, in the step (1), the stirring speed is more than 200r/min, and the stirring time is more than 60min.
By adopting the technical scheme, the components are uniformly mixed, and the insulating material with better performances is obtained. When the stirring speed is lower than 200r/min, the diffusion speed of the silane coupling agent in the system is low, the components are unevenly mixed, the uniformity of the mixed treatment fluid is poor, and when the stirring time is lower than 60min, the uniformity of the treatment fluid is poor, and the heat insulation performance is affected.
In a third aspect, the application provides an application of a new energy automobile battery cell mica insulation material, which adopts the following technical scheme:
the application of the mica insulation material for the battery cell of the new energy automobile comprises the steps of filling and sealing a single-core automobile chassis at 50-70 ℃, and heating the chassis to 140-180 ℃ for at least 20min after filling and sealing.
By adopting the technical scheme, the insulating material has good fluidity at 50-70 ℃, so that the insulating material can be well filled in the gaps among the electric cores, and the chassis is heated to 140-180 ℃ for at least 20min after encapsulation is finished so as to accelerate curing and forming, thereby avoiding the phenomenon that the inside cannot be cured due to insufficient temperature and influencing the performance of the insulating material.
In summary, the application has the following beneficial effects:
1. according to the application, the mica powder is used as a base material, and the organic silica gel and the alkali-free glass cloth short fibers are added to form a stable cross-linked structure, so that the insulating treatment liquid with good high temperature resistance and insulating property is obtained, and the compactness of the insulating treatment liquid is further improved by adding the filler, so that the insulating and heat insulation properties of the insulating material are improved, other normal electric cores can be effectively prevented from being influenced when the electric cores deform, expand and fire out due to charge and discharge or thermal runaway, and the safety of the power battery pack of the new energy automobile is effectively improved.
2. The application of the insulating material prepared by the application is to fill and seal the automobile chassis at the temperature of 50-70 ℃, ensure the filling uniformity, ensure the normal filling into the gap, and ensure the solidification and strength of the insulating material by continuous heating in the temperature range after filling and sealing.
Drawings
FIG. 1 is a flow chart of a method provided by the present application;
fig. 2 is a schematic structural diagram of the insulation material after encapsulation according to the present application.
Detailed Description
The present application will be described in further detail with reference to examples.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The high temperature resistant organic silica gel is purchased from Shenzhen Hongzhen technology Co., ltd; the silica hollow microbead powder was purchased from beijing, the scientific and technological company, ltd; polyurethane adhesives were purchased from yoku gold and reputation chemical company NHJ.
Examples
Example 1
The preparation method of the new energy automobile battery cell mica insulation material comprises the following steps:
(1) Preparing a treatment fluid: weighing 20g of mica powder, 6g of high-temperature-resistant organic silica gel and 5g of alkali-free glass cloth short fibers, and stirring and mixing at a speed of 200r/min for 1h to obtain an insulation treatment liquid;
(2) And heating the insulating treatment liquid to 50 ℃, adding 8g of silicon dioxide hollow microsphere powder, 16g of magnesium hydroxide powder and 45g of polyurethane adhesive, and stirring for 30min to obtain the mixed liquid of the insulating material.
(3) And heating and solidifying the obtained mixed solution by using a heater to obtain the insulating material. The alkali-free glass cloth staple fiber used in this example had a particle size of 2500 mesh.
Example 2
The preparation method of the new energy automobile battery cell mica insulation material comprises the following steps:
(1) Preparing a treatment fluid: weighing 28g of mica powder, 14g of high-temperature-resistant organic silica gel and 3g of alkali-free glass cloth short fibers, and stirring and mixing at the speed of 200r/min for 1 hour to obtain an insulation treatment liquid;
(2) And heating the insulating treatment liquid to 60 ℃, adding 11g of silica hollow microsphere powder, 13g of magnesium hydroxide powder and 30g of polyurethane adhesive, and stirring for 30min to obtain the mixed liquid of the insulating material.
(3) And heating and solidifying the obtained mixed solution by using a heater to obtain the insulating material.
Example 3
The preparation method of the new energy automobile battery cell mica insulation material comprises the following steps:
(1) Preparing a treatment fluid: weighing 13.6g of mica powder, 2.4g of high-temperature-resistant organic silica gel and 0.8g of alkali-free glass cloth short fibers, and stirring and mixing at the speed of 200r/min for 1h to obtain an insulation treatment liquid;
(2) And heating the insulating treatment liquid to 70 ℃, adding 14g of silicon dioxide hollow microsphere powder, 10g of magnesium hydroxide powder and 60g of polyurethane adhesive, and stirring for 30min to obtain the mixed liquid of the insulating material.
(3) And heating and solidifying the obtained mixed solution by using a heater to obtain the insulating material.
Examples 4 to 6
The difference between the mica insulation material for the battery cell of the new energy automobile and the embodiment 1 is that the raw material components and the corresponding weight parts are shown in the table 1.
Table 1 the raw materials and the weights (g) thereof in examples 1 to 6
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Mica powder | 20 | 28 | 13.6 | 27.9 | 28.21 | 28.21 |
| High temperature resistant organic silica gel | 6 | 14 | 2.4 | 1.55 | 1.86 | 1.55 |
| Alkali-free glass cloth staple fiber | 5 | 3 | 0.8 | 1.55 | 0.93 | 1.24 |
| Hollow silica microbead powder | 8 | 11 | 14 | 11 | 11 | 11 |
| Magnesium hydroxide powder | 16 | 13 | 10 | 13 | 13 | 13 |
| Polyurethane adhesives | 45 | 30 | 60 | 45 | 45 | 45 |
Example 7
The novel energy automobile battery cell mica insulation material is different from example 6 in that a silane coupling agent is added in the example, the weight of each raw material in the prepared insulation treatment liquid is adjusted, the weight of mica powder is 28.17g, the weight of high-temperature-resistant organic silica gel is 1.52g, the weight of alkali-free glass cloth short fiber is 1.22g, and the weight of the silane coupling agent is 0.09g.
Example 8
The difference between the mica insulation material for the battery cell of the new energy automobile and the embodiment 8 is that the particle size of the alkali-free glass cloth short fiber used in the embodiment is 5000 meshes.
Example 9
The difference between the mica insulation material for the battery cell of the new energy automobile and the embodiment 8 is that the particle size of the alkali-free glass cloth short fiber used in the embodiment is 8000 meshes.
Comparative example
Comparative example 1
A flame retardant PU foam was purchased from Kunshan Chenxin adhesive products Co.
Comparative example 2
The difference between the mica insulation material for a battery cell of a new energy automobile and example 1 is that the treatment liquid is heated to 80 ℃ in the preparation step (2) of the comparative example.
Comparative example 3
The difference between the mica insulation material for a battery cell of a new energy automobile and example 1 is that the treatment liquid is heated to 30 ℃ in the preparation step (2) of the comparative example.
Performance test
Detection method
Thermal conductivity coefficient: according to the method of GB/T3399-1982 "thermal protection plate method for Plastic thermal conductivity test method", the device uses a TC3100 thermal conductivity coefficient meter to test the thermal conductivity coefficient of the prepared mica insulation material;
compression performance: the relative deformation of the mica insulation material is tested according to GB/T8813-1988 compression test method of rigid foam;
tensile strength: the tensile strength is measured according to the test method of GB/T528-2009 "measurement of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber";
resistance to electrical breakdown: the test is carried out according to the test method in GB/T1695-2005 test method for the Power frequency breakdown Voltage and withstand Voltage of vulcanized rubber.
Table 2 test performance
| Thermal conductivity W/(m.K) | Relative deformation/% | Tensile Strength/Mpa | Breakdown strength (kV/mm) | |
| Example 1 | 0.71 | 50 | 3.2 | 25.1 |
| Example 2 | 0.73 | 51 | 2.7 | 25.2 |
| Example 3 | 0.69 | 53 | 2.9 | 25.3 |
| Example 4 | 0.64 | 56 | 3.6 | 26.4 |
| Example 5 | 0.63 | 58 | 3.7 | 26.6 |
| Example 6 | 0.61 | 59 | 3.8 | 26.8 |
| Example 7 | 0.56 | 61 | 4.1 | 27.2 |
| Example 8 | 0.55 | 65 | 4.4 | 27.6 |
| Example 9 | 0.54 | 62 | 4.2 | 27.4 |
| Comparative example 1 | 0.81 | 70 | 2.1 | 15.8 |
| Comparative example 2 | 0.76 | 49 | 2.7 | 21.2 |
| Comparative example 3 | 0.85 | 47 | 2.9 | 19.8 |
Example 1 and comparative example 1 were compared to test fire resistance (flame ignition at 1000 ℃ C. For 10 min), elastic expansion and contraction (sample was pressed to the thinnest using a press to measure deformation with original thickness), high temperature insulation (flame ignition at 1000 ℃ C. For 10min, voltage of 6000V direct current to see if breakdown occurred), and comparative data are shown in Table 3.
Table 3 experimental test data for example 1 and comparative example 1
As can be seen from the combination of example 1 and comparative example 1 and the combination of table 2 and table 3, the test performance of example 1 is significantly better than that of comparative example 1, demonstrating that the mica insulation material for a cell prepared by the scheme of the application has good fireproof, tensile, insulating and heat-resistant properties.
As can be seen from the combination of example 1 and comparative example 2 and the combination of table 2, the test properties of example 1 are significantly better than those of comparative example 1, indicating that the heating temperature of the treatment liquid below 50 ℃ results in uneven distribution of the polyurethane adhesive in the system, resulting in a decrease in the insulation properties of the insulation material.
As can be seen from the combination of example 1 and comparative example 3 with table 2, each test performance of example 1 is significantly better than that of comparative example 3, and the heating temperature of the treatment liquid higher than 70 ℃ results in the occurrence of cured products in the liquid insulating material, which results in the presence of foreign matters inside during curing to affect the performance of the insulating material.
As can be seen from the combination of examples 1 to 6 and table 2, the experimental data of examples 4 to 6 are significantly better than examples 1 to 3, and examples 1 to 3 use a treatment solution in which mica powder, high temperature-resistant organic silica gel and alkali-free glass cloth short fibers are mixed in any ratio, and it can be seen from examples 1 to 3 that when the raw materials in the insulation treatment solution are mixed in any ratio, the prepared samples have lower properties, no effective insulation layer can be formed, and the cured samples have low tensile strength and low breakdown strength. When the raw material adding proportion provided by the application is used, the prepared insulating material has good insulativity and toughness. And when the weight ratio of the mica powder to the high-temperature-resistant organic silica gel to the alkali-free glass cloth short fibers is close to 91:5:4, the performance of the prepared insulating material is better.
As can be seen from the combination of example 1 and example 7 and the combination of table 2, the experimental data of example 7 are better than example 1, demonstrating that the adhesive properties of the raw materials in the treatment fluid can be improved when the silane coupling agent is added, thereby improving the properties of the prepared materials.
As can be seen from a combination of examples 7 and examples 8-9 and table 2, the experimental data of examples 8-9 are all superior to example 7, demonstrating that when alkali-free glass cloth fibers having a particle size of 5000-8000 mesh are used, the fibers have better compatibility and the resulting insulation has better toughness. As can be seen from the comparison of examples 8 and 9, with further increase in particle size, the performance was reduced, resulting in rough surface and further cracking.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The mica insulation material for the battery cell of the new energy automobile is characterized by comprising the following raw materials in parts by weight: 10-52 parts of treatment fluid, 8-14 parts of silica hollow microsphere powder, 10-16 parts of magnesium hydroxide powder and 30-60 parts of polyurethane adhesive, wherein the treatment fluid comprises mica powder, organic silica gel and alkali-free glass cloth short fibers.
2. The mica insulation material for the battery cell of the new energy automobile according to claim 1, wherein the mica insulation material is characterized in that: the weight ratio of the mica powder to the organic silica gel to the alkali-free glass cloth short fiber is 90-92:4-6: 3 to 5.
3. The mica insulation material for the battery cell of the new energy automobile according to claim 1, wherein the mica insulation material is characterized in that: the treatment fluid also comprises a silane coupling agent, wherein the silane coupling agent accounts for 0.1% -0.3% of the treatment fluid.
4. The mica insulation material for the battery cell of the new energy automobile according to claim 1, wherein the mica insulation material is characterized in that: the organic silica gel is high temperature resistant organic silica gel, the solid content is more than 60%, and the temperature is 270 ℃.
5. The mica insulation material for the battery cell of the new energy automobile according to claim 1, wherein the mica insulation material is characterized in that: the particle size of the alkali-free glass cloth short fiber is 5000-8000 meshes.
6. The preparation method of the mica insulation material for the battery cell of the new energy automobile according to any one of claims 1 to 5, which is characterized by comprising the following steps:
(1) Preparing a treatment fluid: weighing mica powder, high-temperature-resistant organic silica gel and alkali-free glass cloth short fibers, mixing, adding a silane coupling agent, and stirring and mixing to obtain an insulating treatment liquid;
(2) And heating the insulating treatment liquid to 50-70 ℃, adding the hollow silica microbead powder, the magnesium hydroxide powder and the polyurethane adhesive, and stirring to obtain the mixed liquid of the insulating material.
7. The method for preparing the mica insulation material for the battery cell of the new energy automobile according to claim 6, wherein the stirring speed in the step (1) is more than 200r/min, and the stirring time is more than 60min.
8. The application of the mica insulation material for the battery cell of the new energy automobile is characterized in that: encapsulating the single-core automobile chassis at 50-70deg.C, and heating the chassis to 140-180deg.C for at least 20min.
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| CN114571823A (en) * | 2022-05-05 | 2022-06-03 | 浙江荣泰电工器材股份有限公司 | Mica composite part for new energy automobile battery cell thermal runaway management and preparation method thereof |
| JP7285039B1 (en) * | 2022-01-19 | 2023-06-01 | 東莞市鴻億導熱材料有限公司 | Insulated heat sink manufacturing process and insulated heat sink |
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| KR20190112423A (en) * | 2018-03-26 | 2019-10-07 | 주식회사 스웨코 | Method for manufaturing insulation mica paper |
| CN113823468A (en) * | 2021-11-22 | 2021-12-21 | 浙江荣泰电工器材股份有限公司 | Low-heat-conductivity high-insulation mica part and forming process |
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