CN111320873A - Heat insulation material used between power battery cores, and preparation method and application thereof - Google Patents
Heat insulation material used between power battery cores, and preparation method and application thereof Download PDFInfo
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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
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- H01M10/65—Means for temperature control structurally associated with the cells
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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Abstract
The invention discloses a heat insulation material used between electric cores of a power battery, and a preparation method and application thereof. The heat insulation material used between the electric cores of the power battery comprises the following raw material components in percentage by weight: 20-30% of organic silicon rubber, 20-30% of nano silicon dioxide, 10-20% of silicon carbide, 5-10% of nano zirconium dioxide, 5-10% of aluminum hydroxide and 5-10% of hollow microspheres. The preparation method comprises the following steps: adding the raw materials into an internal mixer for mixing to obtain a mixture; cooling the mixture, then placing the mixture into an open mill for milling, adding the mixture into a vulcanizing machine for milling, and then discharging sheets; and (3) after the sheets are taken out, putting the sheets into a vulcanizing machine, and vulcanizing and molding at 160-180 ℃ to obtain the heat insulating material for the power battery cores. The thermal insulation material can be widely applied to battery protection. The heat-insulating material for the power battery cells provided by the invention has excellent heat-insulating property, high-temperature resistance, flame retardance, toughness, ductility, ageing resistance and other properties, has low density and flexibility, and can be molded into various shapes according to use scenes.
Description
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a heat insulation material used between power battery cores, and a preparation method and application thereof.
Background
The battery pack of the new energy automobile is usually fixedly placed in a metal shell, and then the mica plate or the aerogel is used for isolating and protecting the batteries in the battery pack. The mica plate has higher density, and is made of a rigid material and is not easy to deform, so that the mica plate is difficult to be fully attached to the battery; aerogels, however, are expensive and cannot withstand the high temperatures generated by battery explosion during thermal runaway.
Therefore, the existing battery protection material is difficult to provide ideal and reliable protection, and once the battery is in fire and explosion, the battery is isolated by lack of reliable heat insulation materials and cannot effectively insulate heat and resist flame.
Therefore, in order to solve the above technical problems, it is necessary to provide a new heat insulating material for use between power battery cells.
Disclosure of Invention
The invention aims to provide a heat insulation material used between power battery cells, which is simple to manufacture, excellent in heat insulation performance and high in strength, and a preparation method and application thereof, so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a heat insulation material used between electric cores of a power battery comprises the following raw material components in percentage by weight:
further, the average molecular weight of the silicone rubber is 300000-800000.
Further, the organic silicon rubber is one or more of methyl silicon rubber, methyl vinyl silicon rubber and methyl vinyl phenyl silicon rubber.
Further, the average particle size of the nano silicon dioxide is 1-100 nm.
Furthermore, the average particle size of the nano zirconium dioxide is 1-100 nm.
Further, the hollow microspheres are ceramic hollow microspheres and/or glass hollow microspheres with a heat insulation function.
Furthermore, the particle size range of the hollow microspheres is 10-200 μm.
A preparation method of a heat insulation material used between electric cores of a power battery comprises the following steps;
step 1: weighing raw material components required for preparing the heat insulation material used between the power battery electric cores;
step 2: adding organic silicon rubber into an internal mixer for plastication to obtain plasticated rubber;
and step 3: placing the plasticated rubber and other raw material components into a mixing roll for mixing to obtain mixed rubber, and then calendering and molding the mixed rubber;
and 4, step 4: and after forming, putting the molded product in a vulcanizing machine, vulcanizing and forming the product at 160-180 ℃, and slicing the product to obtain the heat insulation material used between the electric cores of the power battery.
The heat insulating material for the power battery cells can be applied to battery protection, and particularly can be applied to power battery protection of new energy automobiles.
The invention has the beneficial effects that:
compared with the prior art, the heat insulating material for the power battery cells provided by the invention has excellent heat insulating property (after one surface of the heat insulating material for the power battery cells is burned by flame at 1500 ℃ for 5min, the temperature of the other surface does not exceed 300 ℃), high temperature resistance, flame retardance, toughness, ductility, ageing resistance and other properties, and has small density and flexibility, and can be molded into various shapes according to use scenes; meanwhile, the method has the advantages of simple production and processing technology and low cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of the thermal insulation material used between power battery cells in the application in battery protection.
Description of reference numerals: 10. a guard; 11. a main body portion; 12. a first side portion; 13. a second side portion; 14. a first groove; 15. a second groove; 21. a first battery; 22. a second battery.
Detailed Description
In order to more fully understand the technical contents of the present invention, the technical solutions of the present invention will be further described and illustrated by the following specific examples.
In the following description, "%" and "part" representing amounts are based on weight unless otherwise specified. Unless otherwise indicated, all numbers expressing feature sizes, quantities, and physical characteristics used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be suitably varied by those skilled in the art in seeking to obtain the desired properties utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.2, 1.4, 1.55, 2, 2.75, 3, 3.80, 4, and 5, and the like.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus; the term "preferred" refers to a preferred alternative, but is not limited to only the selected alternative.
The heat insulating material for the power battery cells provided by the invention has excellent heat insulating performance, can be applied to battery protection, and particularly can be applied to power battery protection of new energy automobiles.
First, examples 1 to 10 and comparative examples 1 to 5
1. The reference numerals of each component indicate
Component A1: methyl silicone rubber, average molecular weight 500000;
component A2: methyl silicone rubber, average molecular weight 400000;
component A3: methyl silicone rubber, average molecular weight 600000;
component A4: methyl vinyl silicone rubber having an average molecular weight of 500000;
component A5: methylvinylphenyl silicone rubber having an average molecular weight of 500000;
and (B) component: nano silicon dioxide with the average particle size of 50 nm;
and (3) component C: silicon carbide;
and (3) component D: nano zirconium dioxide with the average grain diameter of 50 nm;
and (3) component E: aluminum hydroxide;
and (3) component F: the ceramic hollow microspheres have the particle size range of 50-100 mu m.
2. Preparation method
(1) EXAMPLES 1 to 10 preparation methods
Step 1: weighing the raw material components according to the table 1;
step 2: adding organic silicon rubber into an internal mixer for plastication to obtain plasticated rubber;
and step 3: placing the plasticated rubber and other raw material components into a mixing roll for mixing to obtain mixed rubber, and then calendering and molding the mixed rubber;
and 4, step 4: and after molding, putting the molded product in a vulcanizing machine, vulcanizing and molding at 170 ℃, and slicing to obtain the corresponding heat insulation material sample used between the power battery cores.
(2) Comparative examples 1 to 5
Step 1: weighing the raw material components according to the table 2;
step 2: adding organic silicon rubber into an internal mixer for plastication to obtain plasticated rubber;
and step 3: placing the plasticated rubber and other raw material components into a mixing roll for mixing to obtain mixed rubber, and then calendering and molding the mixed rubber;
and 4, step 4: and after molding, putting the molded product in a vulcanizing machine, vulcanizing and molding at 170 ℃, and slicing to obtain the corresponding heat insulation material sample used between the power battery cores.
3. Performance test method
High temperature resistance: using acetylene flame with temperature above 1500 deg.C to add oxygen and impact for 30min, and observing whether burn-through occurs;
density: testing according to ASTM D792-2013;
flame retardancy: testing according to UL94-V0 standard;
tensile strength: testing according to ASTM D412-1998 (2002);
elongation at break: testing according to ASTM D412-1998 (2002);
resistance under combustion: continuously burning for 5min under 1500 ℃ flame, and testing resistance;
voltage resistance: testing according to GB/T1695-;
heat insulation: burning one surface of the heat insulation material used between the power battery cells by using flame at 1500 ℃, and measuring the temperature of the other surface of the heat insulation material used between the power battery cells after 5 min;
long-term weather resistance: test according to the double 85 standard.
4. Conclusion analysis
(1) In combination with tables 1, 2 and 3, it can be seen that the following results are obtained by comparing example 1 with comparative examples 1 to 3: compared with the example 1, the high-temperature resistance of the samples prepared in the comparative examples 1 to 3 is more different; the main differences between the comparative examples 1 to 3 and the example 1 are as follows: the component A1 (methyl silicone rubber) is respectively adopted to replace the component B (nano silicon dioxide), the component C (silicon carbide) and the component D (nano zirconium dioxide) in the example 1; therefore, the nano silicon dioxide, the silicon carbide and the nano zirconium dioxide are combined to obtain good high temperature resistance;
(2) by combining tables 1, 2 and 3, it can be seen that example 1 and comparative example 4 are compared: comparative example 4 has inferior heat insulating properties compared to example 1; the main difference between comparative example 4 and example 1 is: component A1 (methyl silicone rubber) was used in place of component F (ceramic hollow microspheres) in example 1; therefore, the use of the ceramic hollow microspheres can improve the heat insulation performance of the heat insulation material used between the power battery cells;
(3) by combining tables 1, 2 and 3, it can be seen that example 10 and comparative example 5 are compared: comparative example 5 has significantly poorer tensile strength than example 10; the main difference between comparative example 5 and example 10 is: the weight percentage of component a1 (methyl silicone rubber, average molecular weight 500000) in example 10 was 20%, and component a1 (methyl silicone rubber, average molecular weight 500000) in comparative example 5 was slightly below 20%; it can be seen that the tensile strength of the thermal insulation material used between power battery cells is significantly reduced when the weight percentage of component a1 (methyl silicone rubber, average molecular weight 500000) is below 20%; this is mainly because the binding capacity of component a1 as a substrate for binding other components is greatly reduced below a certain critical value.
Table 1-components and contents in examples 1 to 10:
table 2-components and contents in comparative examples 1 to 5:
| raw materials | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Component A1 | 55 | 50 | 40 | 38 | 18 |
| Component B | 25 | 25 | 25 | 30 | |
| Component C | 20 | 20 | 20 | 20 | |
| |
10 | 10 | 10 | 10 | |
| Component E | 8 | 8 | 8 | 10 | |
| Component F | 7 | 7 | 7 | 7 | 10 |
Table 3-Performance test results for thermal insulation materials used between cells of power batteries prepared in examples 1 to 10 and comparative examples 1 to 5:
second, examples 11 to 20
1. The reference numerals of each component indicate
Component A6: methyl silicone rubber, average molecular weight 300000;
component A7: methyl silicone rubber, average molecular weight 800000;
component B1: nano silicon dioxide with the average particle size of 10 nm;
component B2: nano silicon dioxide with the average particle size of 100 nm;
and (3) component C: silicon carbide;
component D1: nano zirconium dioxide with the average grain diameter of 10 nm;
component D2: nano zirconium dioxide with the average grain diameter of 100 nm;
and (3) component E: aluminum hydroxide;
and (3) component F: the ceramic hollow microspheres have the particle size range of 50-100 mu m.
2. Preparation method
(1) Examples 11 to 20 preparation methods
Step 1: weighing the raw material components according to the table 4;
step 2: adding organic silicon rubber into an internal mixer for plastication to obtain plasticated rubber;
and step 3: placing the plasticated rubber and other raw material components into a mixing roll for mixing to obtain mixed rubber, and then calendering and molding the mixed rubber;
and 4, step 4: and after molding, putting the molded product in a vulcanizing machine, vulcanizing and molding at 170 ℃, and slicing to obtain the corresponding heat insulation material sample used between the power battery cores.
3. Performance test method
High temperature resistance: using acetylene flame with temperature above 1500 deg.C to add oxygen and impact for 30min, and observing whether burn-through occurs;
density: testing according to ASTM D792-2013;
flame retardancy: testing according to UL94-V0 standard;
tensile strength: testing according to ASTM D412-1998 (2002);
elongation at break: testing according to ASTM D412-1998 (2002);
resistance under combustion: continuously burning for 5min under 1500 ℃ flame, and testing resistance;
voltage resistance: testing according to GB/T1695-;
heat insulation: burning one surface of the heat insulation material used between the power battery cells by using flame at 1500 ℃, and measuring the temperature of the other surface of the heat insulation material used between the power battery cells after 5 min;
long-term weather resistance: test according to the double 85 standard.
Table 4-components and contents in examples 11 to 20:
table 5-results of performance testing of the thermal insulation materials used between cells of power batteries prepared in examples 11-20:
as can be seen from tables 4 and 5, the heat insulating materials for use between power battery cells prepared in examples 11 to 20 have excellent heat insulating properties, high temperature resistance, flame retardancy, tensile strength, and the like.
In conclusion, the heat insulating material for the power battery cells provided by the invention has excellent heat insulating property (after one surface of the heat insulating material for the power battery cells is burned by flame at 1500 ℃ for 5min, the temperature of the other surface does not exceed 300 ℃), high temperature resistance, flame retardance, toughness, ductility, ageing resistance and other properties; the density is low, the flexibility is realized, and various shapes can be molded according to the use scene; meanwhile, the method has the advantages of simple production and processing technology and low cost.
The heat insulation material used between the electric cores of the power battery provided by the invention is mainly prepared by fusing nano silicon dioxide, silicon carbide, nano zirconium dioxide and other materials through organic silicon rubber, can generate the physical-chemical mutual coupling action of ceramic and carbonization in a short time under the impact of high-temperature flame, thereby forming a hard shell to resist the impact of the flame, and further increasing the heat insulation performance of the heat insulation material used between the electric cores of the power battery through the hollow microspheres, so that the heat insulation material used between the electric cores of the power battery can have excellent heat insulation effect with the electric cores; meanwhile, the nano silicon dioxide can play a role in structural reinforcement.
Application of heat insulation material used between power battery cells in battery protection
The following further describes the thermal insulation material for the power battery cells provided by the invention in combination with a specific application scenario:
the protection element 10 for battery flame retardant and buffering is formed by processing (integrally molding) the thermal insulation material used between the power battery cells into an i shape, and the protection element 10 comprises a main body part 11, a first side part 12 and a second side part 13. The main body portion 11, the first side portion 11 and the second side portion 13 together define a first recess 14 and a second recess 15.
When in use, the first groove 14 is arranged corresponding to the first battery 21, and the second groove 15 is arranged corresponding to the second battery 22; and the width of the first groove 14 is configured to be slightly smaller than the width of the first battery 21, and the width of the second groove 15 is configured to be slightly smaller than the width of the second battery 22. This arrangement allows a gap to be formed between the protective shield 10 and the first and second batteries 21 and 22 by the first and second recesses 14 and 15. The gap may provide a space for yielding when the battery bulges, thereby avoiding excessive compression of the battery by the protective member.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The heat insulation material used between the electric cores of the power battery is characterized by comprising the following raw material components in percentage by weight:
2. the heat insulating material used between the electric cores of the power battery as claimed in claim 1, wherein the average molecular weight of the silicone rubber is 300000-800000.
3. The heat insulating material used between the power battery cells according to claim 2, wherein the silicone rubber is one or more of methyl silicone rubber, methyl vinyl silicone rubber and methyl vinyl phenyl silicone rubber.
4. The thermal insulation material used between power battery cells according to claim 1, wherein the average particle size of the nano silica is 1-100 nm.
5. The thermal insulation material used between power battery cells according to claim 1, wherein the average particle size of the nano zirconium dioxide is 1-100 nm.
6. The insulating material used between power battery cells according to claim 1, wherein the hollow microspheres are ceramic hollow microspheres and/or glass hollow microspheres.
7. The thermal insulation material used between power battery cells according to claim 7, wherein the particle size of the hollow microspheres is 10-200 μm.
8. A preparation method of a heat insulating material used between electric cores of a power battery is characterized by comprising the following steps;
step 1: weighing raw material components required for preparing the heat insulation material used between the power battery electric cores;
step 2: adding organic silicon rubber into an internal mixer for plastication to obtain plasticated rubber;
and step 3: placing the plasticated rubber and other raw material components into a mixing roll for mixing to obtain mixed rubber, and then calendering and molding the mixed rubber;
and 4, step 4: and after forming, putting the molded product in a vulcanizing machine, vulcanizing and forming the product at 160-180 ℃, and slicing the product to obtain the heat insulation material used between the electric cores of the power battery.
9. Use of the insulating material between power battery cells according to any of claims 1 to 7 for battery protection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023216073A1 (en) * | 2022-05-09 | 2023-11-16 | Dow Silicones Corporation | Organopolysiloxane composition with ceramic microspheres |
| WO2023216074A1 (en) * | 2022-05-09 | 2023-11-16 | Dow Silicones Corporation | Organopolysiloxane foam with ceramic microspheres |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2023216074A1 (en) * | 2022-05-09 | 2023-11-16 | Dow Silicones Corporation | Organopolysiloxane foam with ceramic microspheres |
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