CN111320453A - Isolation material for inhibiting thermal runaway diffusion of battery - Google Patents
Isolation material for inhibiting thermal runaway diffusion of battery Download PDFInfo
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- CN111320453A CN111320453A CN202010094027.7A CN202010094027A CN111320453A CN 111320453 A CN111320453 A CN 111320453A CN 202010094027 A CN202010094027 A CN 202010094027A CN 111320453 A CN111320453 A CN 111320453A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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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Abstract
The invention provides an isolation material for inhibiting thermal runaway diffusion of a battery, which comprises the following components in parts by weight: 100 parts of silicate aggregate filled with heat conduction materials, 30-100 parts of water glass, 3-10 parts of water repellent, 2-5 parts of curing agent, 3-10 parts of active filler, 5-10 parts of silica sol, 5-10 parts of styrene-acrylic emulsion surfactant, 1-5 parts of water glass reinforcing agent, 1-10 parts of reinforcing fiber and 2-10 parts of flame retardant. The isolating material provided by the invention can exert flame retardant and heat insulation effects under the condition that the battery is out of control even catches fire, and can effectively inhibit the battery from spreading out of control; the battery has certain heat dissipation performance at low temperature, and the heat dissipation performance of the battery in normal operation cannot be influenced; and because the reinforcing fiber is added into the raw materials, the isolation material has certain fracture resistance and strength, and the phenomenon of structural damage can not occur when the battery expands due to thermal runaway.
Description
Technical Field
The invention relates to the technical field of battery safety, in particular to an isolating material for inhibiting thermal runaway diffusion of a battery.
Background
In recent years, the lithium ion battery is rapidly developed in China, the market scale of the lithium ion battery in China is predicted to reach 170.55GWH by 2020, and the global market share of the lithium ion battery in China reaches 70%. The lithium battery system used at present still has very big potential safety hazard, and prior art can't guarantee its security of using completely, and the safety problem of battery arouses people's attention more and more. Researches show that the reason for fire disasters of lithium ion battery electrochemical energy storage systems, electric automobiles and the like is mainly that batteries are out of control thermally and the batteries are out of control thermally and diffuse, and a large amount of batteries simultaneously appear out of control thermally and generate a large amount of heat to cause fire.
At present, the research on the safety of the battery is mainly focused on the fire prevention after the battery fire occurs, the fire is quickly extinguished and the battery reburning is inhibited by adopting a proper fire extinguishing agent, a fire extinguishing strategy and other modes, and then the casualties are reduced and the property loss is reduced. However, the fire extinguishing agent needs a certain response time when in use, casualties can occur in the time, most batteries of the whole battery system are in failure after thermal runaway diffusion usually occurs, property loss is large, and therefore the suppression of the thermal runaway diffusion of the batteries gradually starts to attract people's attention.
At present, a method for inhibiting battery thermal runaway diffusion generally introduces flame-retardant ceramic or rubber materials with low thermal conductivity coefficient, the materials are placed between batteries or between battery modules, and when a battery has a thermal runaway condition, heat is isolated and flame retardant is carried out, so that thermal runaway diffusion is controlled. However, since the battery generates a certain amount of heat during normal operation, the heat cannot be diffused in time after the material is introduced, and the potential safety hazard is increased, so that the insulating material is not commercially used in a large scale.
Disclosure of Invention
In view of this, the invention provides an isolation material capable of conducting heat normally at normal temperature and used for inhibiting battery thermal runaway diffusion, and aims to reduce heat transferred to an adjacent battery or an external space of a battery system when a battery unit is thermally runaway while ensuring that the normal operation of the battery is not affected.
In one aspect, the invention provides a separation material for inhibiting thermal runaway diffusion of a battery, which comprises the following components in parts by weight: 100 parts of silicate aggregate filled with heat conduction materials, 30-100 parts of water glass, 3-10 parts of water repellent, 2-5 parts of curing agent, 3-10 parts of active filler, 5-10 parts of silica sol, 5-10 parts of styrene-acrylic emulsion surfactant, 1-5 parts of water glass reinforcing agent, 1-10 parts of reinforcing fiber and 2-10 parts of flame retardant.
Further, in the above isolating material for inhibiting thermal runaway diffusion of the battery, in the silicate aggregate filled with the heat conducting material, the weight ratio of the heat conducting material to the porous silicate is 1:20-1: 2.
Further, in the above-mentioned separator for suppressing thermal runaway diffusion of a battery, the porous silicate is expanded perlite, expanded vermiculite or porous ceramic sand.
Further, in the above separator for suppressing thermal runaway diffusion of a battery, the thermally conductive material is at least one selected from the group consisting of fine metal powder, graphite, and derivatives thereof.
Further, in the above separator for suppressing thermal runaway diffusion of a battery, the reinforcing fiber is selected from one or more of fibers such as pre-oxidized fiber, glass fiber and ceramic fiber.
Further, in the above separator for inhibiting thermal runaway diffusion of a battery, the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate, triethyl phosphate, melamine compounds and cyanurate compounds.
Further, in the above separator for inhibiting thermal runaway diffusion of a battery, the water repellent is one or more compounds selected from the group consisting of methyl silicate, chlorosilicate and polyvinyl alcohol; the curing agent is selected from one or more of sodium fluosilicate, sodium trimetaphosphate, sodium hexametaphosphate, sodium dihydrogen phosphate and silicon phosphate; the water glass reinforcing agent is selected from one or more of ethyl formate, ethyl acetate, propyl acetate and propyl propionate.
The invention also provides a preparation method of the isolating material for inhibiting the thermal runaway diffusion of the battery, which comprises the following steps: (1) mixing and stirring 100 parts of silicate aggregate filled with heat conduction materials, 5-10 parts of silica sol and 5-10 parts of styrene-acrylic emulsion surfactant for 30-60min at the rotating speed of 100-500rpm, and then naturally drying for 3-6 h;
(2) continuously adding 30-100 parts of water glass, 1-5 parts of water glass reinforcing agent, 3-10 parts of active filler and 2-5 parts of curing agent into the mixture, and stirring at the rotating speed of 200-500rmp for 10-30 min;
(3) stirring and mixing the materials obtained in the step (1) and the step (2) with 1-10 parts of reinforcing fiber at the rotating speed of 100-500rmp for 10-60 min;
(4) adding 3-10 parts of water repellent into the material obtained in the step (3), mixing and stirring at the rotating speed of 100-.
Further, in the above method for preparing the insulating material, the method for preparing the silicate aggregate filled with the heat conductive material comprises: uniformly mixing the heat conduction material and the preparation raw material of the porous silicate according to a preset weight ratio, preheating at the temperature of 300-500 ℃ for 5-20min, co-calcining at the temperature of 1000-1300 ℃ for 5-15min, and cooling.
According to the isolating material for inhibiting the thermal runaway diffusion of the battery, the substance with certain thermal conductivity is inserted into the gap of the silicate, so that the prepared isolating material can have certain thermal conductivity under the low-temperature condition, and the thermal conductivity coefficient of the silicate of the aggregate is obviously reduced along with the rise of the temperature, so that the prepared isolating material has excellent thermal insulation performance, the effects of inflaming retarding and thermal insulation can be favorably realized under the condition that the thermal runaway of the battery even catches fire, and the spreading of the thermal runaway of the battery can be effectively inhibited; the battery has certain heat dissipation performance at low temperature, and the heat dissipation performance of the battery in normal operation can not be influenced; and because the reinforcing fiber is added into the raw materials, the isolation material has certain fracture resistance and strength, and the phenomenon of structural damage can not occur when the battery expands due to thermal runaway.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for preparing an isolation material according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating the use of the separator in a battery module according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the insulating material for inhibiting thermal runaway diffusion of a battery according to an embodiment of the present invention includes the following components in parts by weight: 100 parts of silicate aggregate filled with heat conduction materials, 30-100 parts of water glass, 3-10 parts of water repellent, 2-5 parts of curing agent, 3-10 parts of active filler, 5-10 parts of silica sol, 5-10 parts of styrene-acrylic emulsion surfactant, 1-5 parts of water glass reinforcing agent, 1-10 parts of reinforcing fiber and 2-10 parts of flame retardant.
Specifically, silicate aggregates filled with a heat conductive material are substances having a certain heat conductive property inserted in the pores of porous silicate. In the embodiment, various raw materials for preparing the porous silicate aggregate are mixed with the heat conduction material to prepare the silicate aggregate filled with the heat conduction material.
In this embodiment, the preparation method of the silicate aggregate filled with the heat conductive material is as follows:
uniformly mixing the heat conduction material and the preparation raw materials of the porous silicate according to a certain proportion, preheating at the temperature of 300-500 ℃ for 5-20min, co-calcining at the temperature of 1000-1300 ℃ for 5-15min, and cooling to obtain the silicate aggregate filled with the heat conduction material. The weight ratio of the heat conduction material to the porous silicate is 1:20-1:2, preferably 1: 10. The size of the thermally conductive material is determined by the pore size of the porous silicate. In this embodiment, the pore size of the porous silicate may be in the range of 5 to 100 microns, preferably 30 to 60 microns.
Wherein: the porous silicate can be porous ceramic sand, expanded perlite or expanded vermiculite. For example, the raw materials for preparing the porous ceramic sand comprise: 60-90 parts of oil shale slag, 15-25 parts of clay, 3-8 parts of sodium bicarbonate, 2-5 parts of calcium carbonate and 1-5 parts of magnesium carbonate; preferably, the raw materials for preparing the porous ceramic sand comprise: 70 parts of oil shale slag, 20 parts of clay, 5 parts of sodium bicarbonate, 3 parts of calcium carbonate and 2 parts of magnesium carbonate.
The preparation raw materials of the porous perlite comprise: 30-60 parts of 30-50 mesh perlite, preferably 45 parts; 30-60 parts of 50-70 mesh pearl salt, preferably 45 parts.
The raw material for preparing the expanded vermiculite can be 50-100 meshes of vermiculite.
The heat conductive material is at least one selected from the group consisting of fine metal powder, graphite, and derivatives thereof. The active filler can be at least one of kaolin, active magnesium oxide, white carbon black, lithium-based ultrafine bentonite and calcium carbonate.
The water repellent is one or more compounds selected from methyl silicate, chlorosilicate and polyvinyl alcohol.
The curing agent is one or more compounds selected from sodium fluosilicate, sodium trimetaphosphate, sodium hexametaphosphate, sodium dihydrogen phosphate and silicon phosphate.
The water glass reinforcing agent is selected from one or more compounds of ethyl formate, ethyl acetate, propyl acetate and propyl propionate.
Since thermal runaway of batteries is usually accompanied by the phenomenon of volume expansion, reinforcement and toughening of the separator are required. In the invention, the reinforced fiber is added when the isolation material is prepared, wherein the reinforced fiber is selected from one or more fibers of pre-oxidized fiber, glass fiber, ceramic fiber and the like.
The flame retardant is one or more compounds selected from aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate, triethyl phosphate, melamine compounds and cyanurate compounds.
In the invention, the preparation method of the isolating material for inhibiting the thermal runaway diffusion of the battery comprises the following steps:
(1) mixing and stirring 100 parts of silicate aggregate filled with heat conduction materials, 5-10 parts of silica sol and 5-10 parts of styrene-acrylic emulsion surfactant for 30-60min at the rotating speed of 100-500rpm, and then naturally drying for 3-6 h;
(2) continuously adding 30-100 parts of water glass, 1-5 parts of water glass reinforcing agent, 3-10 parts of active filler and 2-5 parts of curing agent into the mixture, and stirring at the rotating speed of 200-500rmp for 10-30 min;
(3) stirring and mixing the materials obtained in the step (1) and the step (2) with 1-10 parts of reinforcing fiber at the rotating speed of 100-500rmp for 10-60 min;
(4) adding 3-10 parts of water repellent into the material obtained in the step (3), mixing and stirring at the rotating speed of 100-. The isolating material prepared in the embodiment can be in a square or cylindrical plate-shaped structure, and the shape of the isolating material can be determined by selecting a corresponding die according to a specific application occasion.
In the invention, the substance with certain heat conductivity is inserted into the gap of the silicate, so that the prepared isolation material has certain heat conductivity under the low-temperature condition, and the heat conductivity coefficient of the silicate of the aggregate is obviously reduced along with the rise of the temperature, so that the prepared isolation material has excellent heat insulation performance, thereby being beneficial to realizing the effects of inflaming retarding and heat insulation under the condition that the battery is out of control or even catches fire, and effectively inhibiting the spreading of the battery out of control; the battery has certain heat dissipation performance at low temperature, and the heat dissipation performance of the battery in normal operation can not be influenced; in addition, because the reinforcing fiber is added into the raw materials, the isolation material has certain fracture resistance and strength, and the phenomenon of structural damage can not occur when the battery expands due to thermal runaway.
Referring to fig. 2, which illustrates the manner in which the separator material is used in the battery module, it can be seen that: the battery module includes: a housing 3, a plurality of battery cells 1 disposed in the housing 3; wherein, a plurality of battery monomers 1 are connected in series and in parallel and are finally connected with the outside through a lead 4. The prepared isolation material 2 can be arranged between any two adjacent battery cells 1 and coated on the inner wall of the shell 3.
The invention is described in detail below in several specific examples:
example 1
(1) Weighing the following raw materials in parts by weight: 10 parts of flexible graphite, 70 parts of oil shale slag, 20 parts of common clay, 5 parts of sodium bicarbonate, 3 parts of calcium carbonate and 2 parts of magnesium carbonate, wherein the components are uniformly mixed, then the mixture is placed in a 300 ℃ drying oven for drying for 15min, and then the dried mixture is immediately transferred into a sintering furnace to be sintered for 10min at 1100 ℃, and the flexible graphite filled pottery sand can be obtained after cooling;
(2) adding 100 parts of flexible graphite filling ceramic sand, 6 parts of silica sol and 5 parts of styrene-acrylic emulsion into a mortar mixing stirrer, mixing for 40min at the rotating speed of 300rmp, and naturally drying for 3h for subsequent use;
(3) adding 60 parts of water glass, 2 parts of sodium trimetaphosphate, 2 parts of sodium hexametaphosphate and 2 parts of ethyl acetate into another stirrer, and stirring at the rotating speed of 400rmp for 30 min;
(4) uniformly mixing the (2) and (3) with 5 parts of pre-oxidized fiber and 5 parts of glass fiber in a stirrer, and stirring for 20min at the rotating speed of 300 rmp;
(5) and (3) adding 5 parts of sodium methyl silicate into the material obtained in the step (4), mixing and stirring at the rotating speed of 300rmp for 20min, injecting into a mold of 300 x 200 x 2mm, flattening the material, pressing into a plate by using a pressure of 20MPa, drying the plate at 150 ℃ for 3h, and cooling to obtain the thermal runaway diffusion isolation material for the lithium ion battery.
Example 2
(1) Weighing the following raw materials in parts by weight: 10 parts of flexible graphite, 60 parts of oil shale slag, 25 parts of common clay, 8 parts of sodium bicarbonate, 5 parts of calcium carbonate and 2 parts of magnesium carbonate, wherein the components are uniformly mixed, then the mixture is placed in a 300 ℃ drying oven for drying for 20min, and then the dried mixture is immediately transferred into a sintering furnace to be sintered for 15min at 1100 ℃, and the flexible graphite filled pottery sand can be obtained after cooling;
(2) adding 100 parts of flexible graphite filling ceramic sand, 5 parts of silica sol and 10 parts of styrene-acrylic emulsion into a mortar mixing stirrer, mixing for 40min at the rotating speed of 300rmp, and naturally drying for 3h for subsequent use;
(3) adding 100 parts of water glass, 4 parts of sodium trimetaphosphate, 4 parts of sodium hexametaphosphate and 2 parts of ethyl acetate into another stirrer, and stirring at the rotating speed of 400rmp for 30 min;
(4) uniformly mixing the (2) and (3) with 5 parts of pre-oxidized fiber and 3 parts of glass fiber in a stirrer, and stirring for 20min at the rotating speed of 300 rmp;
(5) and (3) adding 5 parts of sodium methyl silicate into the material obtained in the step (4), mixing and stirring at the rotating speed of 300rmp for 20min, injecting into a mold of 300 x 200 x 2mm, flattening the material, pressing into a plate by using a pressure of 20MPa, drying the plate at 180 ℃ for 2h, and cooling to obtain the thermal runaway diffusion isolation material for the lithium ion battery.
Example 3
(1) Weighing the following raw materials in parts by weight: 10 parts of flexible graphite, 45 parts of 30-50 mesh perlite and 45 parts of 50-70 mesh perlite, uniformly mixing the components, placing the mixture in an oven at 350 ℃ for preheating for 10min, immediately transferring the mixture into a sintering furnace, expanding the mixture for 20 seconds at 1100 ℃, and cooling the mixture to obtain the flexible graphite filled porous perlite;
(2) adding 100 parts of flexible graphite filled porous perlite, 10 parts of silica sol and 10 parts of styrene-acrylic emulsion into a mortar mixing stirrer, mixing for 40min at the rotating speed of 300rmp, and naturally drying for 3h for subsequent use;
(3) adding 100 parts of water glass, 2 parts of sodium trimetaphosphate, 3 parts of sodium hexametaphosphate and 5 parts of ethyl acetate into another stirrer, and stirring at the rotating speed of 400rmp for 30 min;
(4) uniformly mixing the (2) and (3) with 5 parts of pre-oxidized fiber and 3 parts of glass fiber in a stirrer, and stirring for 20min at the rotating speed of 300 rmp;
(5) and (3) adding 10 parts of sodium methyl silicate into the material obtained in the step (4), mixing and stirring at the rotating speed of 300rmp for 20min, injecting into a mold of 300 x 200 x 2mm, flattening the material, pressing into a plate by using a pressure of 20MPa, drying the plate at 150 ℃ for 3h, and cooling to obtain the thermal runaway diffusion isolation material for the lithium ion battery.
Example 4
(1) Weighing the following raw materials in parts by weight: 10 parts of flexible graphite and 90 parts of 50-100 mesh vermiculite, uniformly mixing the components, expanding for 2min at 1100 ℃, and cooling to obtain the flexible graphite filled vermiculite;
(2) adding 100 parts of flexible graphite filled vermiculite, 6 parts of silica sol and 8 parts of styrene-acrylic emulsion into a mortar mixing stirrer, mixing for 40min at the rotating speed of 300rmp, and naturally drying for 3h for subsequent use;
(3) adding 60 parts of water glass, 2 parts of sodium trimetaphosphate, 2 parts of sodium hexametaphosphate and 2 parts of ethyl acetate into another stirrer, and stirring at the rotating speed of 400rmp for 30 min;
(4) uniformly mixing the (2) and (3) with 5 parts of pre-oxidized fiber and 5 parts of glass fiber in a stirrer, and stirring for 20min at the rotating speed of 300 rmp;
(5) adding 3 parts of sodium methyl silicate into the material obtained in the step (4), mixing and stirring at the rotating speed of 300rmp for 20min, injecting into a mold of 300 x 200 x 2mm, flattening the material, pressing into a plate by using a pressure of 20MPa, drying the plate at 150 ℃ for 3h, and cooling to obtain the thermal runaway diffusion isolation material for the lithium ion battery.
In conclusion, the isolating material for inhibiting the thermal runaway diffusion of the battery can exert the flame-retardant and heat-insulating effects under the condition that the battery is subjected to thermal runaway and even catches fire, and can effectively inhibit the thermal runaway spread of the battery; the battery has certain heat dissipation performance at low temperature, and the heat dissipation performance of the battery in normal operation cannot be influenced; and because the reinforcing fiber is added into the raw materials, the isolation material has certain fracture resistance and strength, and the phenomenon of structural damage can not occur when the battery expands due to thermal runaway.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The isolating material for inhibiting the thermal runaway diffusion of the battery is characterized by comprising the following components in parts by weight: 100 parts of silicate aggregate filled with heat conduction materials, 30-100 parts of water glass, 3-10 parts of water repellent, 2-5 parts of curing agent, 3-10 parts of active filler, 5-10 parts of silica sol, 5-10 parts of styrene-acrylic emulsion surfactant, 1-5 parts of water glass reinforcing agent, 1-10 parts of reinforcing fiber and 2-10 parts of flame retardant.
2. The insulation material for inhibiting thermal runaway diffusion of a battery according to claim 1, wherein in the silicate aggregate filled with the heat conduction material, the weight ratio of the heat conduction material to the raw material of the porous silicate is 1:20-1: 2.
3. The separator material for suppressing thermal runaway diffusion of a battery as claimed in claim 2, wherein the porous silicate is expanded perlite, expanded vermiculite or porous ceramic sand.
4. The separator for suppressing thermal runaway diffusion of a battery as claimed in claim 1, wherein the thermally conductive material is selected from at least one of fine metal powder, graphite, and derivatives thereof.
5. The separator for suppressing thermal runaway diffusion of a battery as claimed in claim 1, wherein the reinforcing fiber is selected from one or more of pre-oxidized fiber, glass fiber and ceramic fiber.
6. The separator material for suppressing thermal runaway diffusion of a battery as claimed in claim 1, wherein the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate, triethyl phosphate, melamine based compounds and cyanurate based compounds.
7. The separator material for suppressing thermal runaway diffusion of a battery as claimed in claim 1, wherein the water repellent is selected from one or more compounds of methyl silicate, chlorosilicate and polyvinyl alcohol; the curing agent is selected from one or more of sodium fluosilicate, sodium trimetaphosphate, sodium hexametaphosphate, sodium dihydrogen phosphate and silicon phosphate; the water glass reinforcing agent is selected from one or more of ethyl formate, ethyl acetate, propyl acetate and propyl propionate.
8. A method of preparing a barrier material according to any one of claims 1 to 7, comprising the steps of:
(1) mixing and stirring 100 parts of silicate aggregate filled with heat conduction materials, 5-10 parts of silica sol and 5-10 parts of styrene-acrylic emulsion surfactant for 30-60min at the rotating speed of 100-500rpm, and then naturally drying for 3-6 h;
(2) continuously adding 30-100 parts of water glass, 1-5 parts of water glass reinforcing agent, 3-10 parts of active filler and 2-5 parts of curing agent into the mixture, and stirring at the rotating speed of 200-500rmp for 10-30 min;
(3) stirring and mixing the materials obtained in the step (1) and the step (2) with 1-10 parts of reinforcing fiber at the rotating speed of 100-500rmp for 10-60 min;
(4) adding 3-10 parts of water repellent into the material obtained in the step (3), mixing and stirring at the rotating speed of 100-.
9. The method for preparing the insulation material according to claim 8, wherein the silicate aggregate filled with the heat conduction material is prepared by: uniformly mixing the heat conduction material and the preparation raw material of the porous silicate according to a preset weight ratio, preheating at the temperature of 300-500 ℃ for 5-20min, co-calcining at the temperature of 1000-1300 ℃ for 5-15min, and cooling.
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| CN112332021A (en) * | 2020-11-03 | 2021-02-05 | 贵州梅岭电源有限公司 | Method for avoiding thermal runaway of lithium ion battery |
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