CN114867135A - Flexible composite phase-change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system - Google Patents
Flexible composite phase-change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system Download PDFInfo
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- CN114867135A CN114867135A CN202210484520.9A CN202210484520A CN114867135A CN 114867135 A CN114867135 A CN 114867135A CN 202210484520 A CN202210484520 A CN 202210484520A CN 114867135 A CN114867135 A CN 114867135A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 129
- 239000012782 phase change material Substances 0.000 title claims abstract description 78
- 239000002131 composite material Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000011231 conductive filler Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 19
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- 239000012074 organic phase Substances 0.000 claims abstract description 14
- 238000005485 electric heating Methods 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 16
- 239000000178 monomer Substances 0.000 claims description 15
- 239000012188 paraffin wax Substances 0.000 claims description 11
- 239000006229 carbon black Substances 0.000 claims description 10
- 238000003801 milling Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 3
- 150000001298 alcohols Chemical class 0.000 claims description 3
- -1 lipid compounds Chemical class 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 description 36
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
-
- 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
- H01M10/615—Heating or keeping warm
-
- 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
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention belongs to the technical field of ion batteries, and particularly relates to a flexible composite phase change material, a preparation method and application thereof, a battery heating element and an ion battery pack with a low-temperature heat management system. The invention provides a flexible composite phase-change material which comprises the following components in parts by mass: 20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material. The flexible composite phase change material provided by the invention has the characteristic of flexibility, can be well attached to the surface of a battery, reduces the heat transfer resistance and avoids the occurrence of local hot spots; meanwhile, the battery has good conductivity, and can be quickly heated by applying small voltage, so that the battery can be quickly and efficiently preheated; and constant temperature heating can be realized, and higher safety is realized.
Description
Technical Field
The invention belongs to the technical field of ion batteries, and particularly relates to a flexible composite phase change material, a preparation method and application thereof, a battery heating element and an ion battery pack with a low-temperature heat management system.
Background
Lithium ion batteries are widely used in various vehicles such as automobiles, unmanned aerial vehicles, and electronic devices. However, lithium ion batteries are used in low temperature environments, and low temperature reduces the conductivity of the electrolyte and the diffusion rate of lithium ions, resulting in a decrease in battery voltage, a rapid decay in battery capacity, and a decrease in battery life, even permanent capacity loss and lithium plating. Lithium plating increases the risk of internal short circuits in the battery, leading to ignition and explosion. Therefore, when the lithium ion battery is used in a low-temperature environment, a power battery thermal management system is needed to perform thermal management on the battery.
At present, the heat management modes of the power battery mainly include: (1) the air is preheated by a metal or semiconductor thermistor (PTC) heater, a heat pump, and then the battery is preheated by hot air. The preheating mode has the advantages of low heating rate, high loss, high cost of the heat pump and large equipment volume; (2) the battery is directly heated through the heating gasket and the like, and the heating rate can be effectively improved through a heat conduction mode.
The application range of the unmanned aerial vehicle is expanded to various fields such as military, commercial and civil use. And unmanned aerial vehicle's use scene often is more complicated than land vehicle, and the temperature of high latitude is changeable, and severe cold condition has great influence to the mileage of unmanned aerial vehicle flight even its security. Because the unmanned aerial vehicle power battery has extremely high requirements on volume and weight, the battery pack of the unmanned aerial vehicle power battery cannot use the heat management mode of the traditional power battery, such as a heat pump. But ordinary electrical heating gasket is a rigid material, can't closely laminate with the battery, local hot spot easily appears, also can't satisfy the thermal management demand of unmanned aerial vehicle power battery group.
Disclosure of Invention
In view of the above, the invention provides a flexible composite phase change material, a preparation method and application thereof, a battery heating element and an ion battery pack with a low-temperature thermal management system. The flexible composite phase change material provided by the invention has good flexibility, and effectively avoids the occurrence of local hot spots; and conductivity is adjustable, can realize preheating the battery fast, high efficiency back constant temperature heating, has higher security.
In order to solve the technical problem, the invention provides a flexible composite phase change material which comprises the following components in parts by mass:
20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material.
Preferably, the spherical conductive filler comprises carbon black and/or spherical nickel powder.
Preferably, the multi-dimensional conductive filler comprises expanded graphite.
Preferably, the polymer matrix comprises a hydrogenated styrene-butadiene block copolymer.
Preferably, the organic phase change material includes one or more of paraffin, alcohol compounds and lipid compounds.
The invention provides a preparation method of the flexible composite phase change material, which comprises the following steps:
mixing a polymer matrix, an organic phase change material, a spherical conductive filler and a multi-dimensional conductive filler to obtain a mixture;
and carrying out open milling on the mixture to obtain the flexible composite phase change material.
The invention provides application of the flexible composite phase change material or the flexible composite phase change material prepared by the preparation method in the technical scheme in an ion battery heating gasket or an ion battery heating shell.
The invention provides an ion battery heating element, which comprises an electric heating film and a heating electrode; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
The invention provides an ion battery pack with a low-temperature thermal management system, which comprises an ion battery pack and a plurality of heating gaskets; the ion battery pack comprises at least 2 ion battery cells; each 1 ion battery monomer is arranged between any two adjacent heating gaskets; the heating pad comprises an electric heating film and a heating electrode electrically connected with the heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
The invention provides an ion battery pack with a low-temperature thermal management system, which comprises an ion battery pack and a heating shell, wherein the heating shell is arranged on the ion battery pack; the ion battery pack comprises at least 2 ion battery monomers, the heating shell is provided with battery holes matched with the ion battery monomers, and 1 ion battery monomer is arranged in 1 battery hole; the heating shell is of a honeycomb structure formed by an electric heating film, and the heating shell also comprises a heating electrode electrically connected with the electric heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
The invention provides a flexible composite phase-change material which comprises the following components in parts by mass: 20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material. The flexible composite phase change material formed by combining the conductive filler, the polymer matrix and the organic phase change material in the two shapes according to the mass parts has the characteristic of flexibility, can be well attached to the surface of a battery, reduces the heat transfer resistance and avoids local hot spots; meanwhile, the conductive fillers in the two shapes are matched with each other, so that the flexible phase change material provided by the invention has good conductivity, and can be quickly heated by applying small voltage, thereby quickly and efficiently preheating the battery; the invention realizes that the resistance of the material is rapidly increased and the heating power is reduced immediately by phase change when the heating temperature of the material reaches the phase change temperature through the organic phase change material component, thereby realizing constant temperature heating and having higher safety.
Moreover, the flexible composite phase change material provided by the invention has good flexibility, can meet the layout of ionic batteries and battery packs in various shapes, can be used for preparing a battery pack frame in an injection molding mode, has good flexibility, small volume and light weight, and can well meet the requirement of thermal management of batteries of unmanned aerial vehicles.
Drawings
FIG. 1 is a cross-sectional view of a heating mat for a prismatic battery low temperature thermal management system prepared in accordance with an example;
FIG. 2 is a cross-sectional view of a composite flexible phase change material for a cylindrical battery pack low temperature thermal management system prepared according to an embodiment;
FIG. 3 illustrates the resistivity of the composite flexible phase change material prepared according to the embodiment of the present invention;
FIG. 4 illustrates the temperature variation of the heating pad under constant DC voltage;
in the figure, 1-1 is a heating gasket prepared from the composite flexible phase-change material provided by the invention, 1-2 is a battery pack shell prepared from the composite flexible phase-change material provided by the invention, 2 is a copper sheet, and 3 is a battery monomer.
Detailed Description
The invention provides a flexible composite phase-change material which comprises the following components in parts by mass:
20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art unless otherwise specified.
The flexible composite phase change material comprises, by mass, 20-35 parts of spherical conductive filler, preferably 22.5-32 parts, and more preferably 25-30 parts.
In the present invention, the spherical conductive filler preferably includes carbon black and/or spherical nickel powder, more preferably carbon black.
The flexible composite phase change material comprises, by mass, 1-5 parts of a multi-dimensional conductive filler, preferably 1.5-4 parts, and more preferably 2-3.5 parts.
In the present invention, the multi-dimensional conductive filler preferably includes expanded graphite.
The flexible composite phase change material comprises, by mass, 20-30 parts of a polymer matrix, preferably 22.5-28 parts, and more preferably 25-27 parts.
In the present invention, the polymer matrix preferably comprises hydrogenated styrene-butadiene block copolymer (SEBS).
In the invention, when the polymer matrix is preferably hydrogenated styrene-butadiene block copolymer, the flexible composite phase change material has good stability and aging resistance.
The flexible composite phase change material comprises, by mass, 40-50 parts of an organic phase change material, preferably 42-46 parts, and more preferably 43-45 parts.
In the present invention, the organic phase change material preferably includes one or more of paraffin, alcohol compounds and lipid compounds, and more preferably paraffin.
In the invention, the phase transition temperature of the paraffin is preferably 10-50 ℃.
The invention provides a preparation method of the flexible composite phase change material, which comprises the following steps:
mixing a polymer matrix, an organic phase change material, a spherical conductive filler and a multi-dimensional conductive filler to obtain a mixture;
and carrying out open milling on the mixture to obtain the flexible composite phase change material.
The invention mixes the polymer matrix, the organic phase-change material, the spherical conductive filler and the multidimensional conductive filler to obtain the mixture.
In the present invention, the mixing preferably comprises the steps of:
heating the polymer matrix and the organic phase-change material, and then carrying out first mixing to obtain a first mixture;
and carrying out second mixing on the first mixed material, the spherical conductive filler and the multidimensional conductive filler.
In the invention, the heating temperature is preferably not lower than the phase transition temperature of the organic phase-change material.
After the mixture is obtained, the invention mills the mixture to obtain the flexible composite phase-change material.
In the invention, the open milling temperature is preferably 130-140 ℃, and more preferably 135 ℃.
In the invention, the heat preservation time of the open mill is preferably 25-40 min, and the time of the open mill is preferably 30 min.
In the present invention, the mixing is preferably carried out in an open mill.
The invention provides an application of the flexible composite phase change material in the technical scheme or the flexible composite phase change material prepared by the preparation method in the technical scheme in an ion battery heating gasket or an ion battery heating shell.
The invention provides an ion battery heating element, which comprises an electric heating film and a heating electrode; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
In the present invention, the method for preparing the electrically heated film preferably includes the steps of:
and vulcanizing or injection molding the flexible composite phase change material or the flexible composite phase change material prepared by the preparation method of the technical scheme to obtain the electric heating film.
In the invention, the temperature of the vulcanization molding is preferably 130-140 ℃, and is preferably 135 ℃.
The invention has no special requirements on the specific implementation process of the injection molding.
In the present invention, the heating member is particularly preferably a heating pad or a heating case.
In the present invention, the heating gasket is preferably prepared by vulcanization molding.
In the present invention, the heating housing is preferably prepared by injection molding.
In the present invention, the thickness of the heating pad is preferably 3 mm.
In the present invention, the length × width × height of the heating housing is particularly preferably 125mm × 90mm × 65 mm.
In the present invention, the heating case is provided with a battery hole.
In the present invention, the diameter of the battery hole is preferably 18 mm.
In the present invention, the number of battery holes in 1 of the heating cases is preferably 15.
In the present invention, the heating electrode is located at an edge position of the heating pad or the heating case.
In the present invention, the heating electrode is particularly preferably a copper electrode.
The invention provides a preparation method of an ion battery heating element, which comprises the following steps:
and the heating electrode is stuck to the edge of the electric heating film by adopting conductive adhesive.
The invention provides an ion battery pack with a low-temperature thermal management system, which comprises an ion battery pack and a plurality of heating gaskets; as shown in fig. 1: the ion battery pack comprises at least 2 ion battery cells; each 1 of the ion battery single bodies is arranged between any two adjacent heating gaskets; the heating pad comprises an electric heating film and a heating electrode electrically connected with the heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
The invention provides an ion battery pack with a low-temperature thermal management system, which comprises an ion battery pack and a heating shell, wherein the heating shell is arranged on the ion battery pack; as shown in fig. 2: the ion battery pack comprises at least 2 ion battery monomers, the heating shell is provided with battery holes matched with the ion battery monomers, and 1 ion battery monomer is arranged in 1 battery hole; the heating shell is of a honeycomb structure formed by an electric heating film, and the heating shell also comprises a heating electrode electrically connected with the electric heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material in the technical scheme or the flexible composite phase-change material prepared by the preparation method in the technical scheme.
In the present invention, the ion battery cell is preferably inserted into the heating hole of the heating case by means of interference fit.
Compared with the prior art, the invention has the following advantages:
the heating gasket or the heating shell prepared from the flexible composite phase-change material provided by the invention has good flexibility, can be well attached to the surface of a battery, reduces heat transfer resistance, and avoids local hot spots.
The heating gasket or the heating shell prepared from the flexible composite phase-change material provided by the invention has good conductivity, and can be rapidly heated by applying small voltage, so that the battery can be rapidly and efficiently preheated.
The heating gasket or the heating shell prepared from the flexible composite phase-change material can realize constant-temperature heating, when the temperature reaches the phase-change temperature, the resistance of the heating gasket or the heating shell can be rapidly increased, the heating power is reduced, the constant-temperature heating is realized, and the safety is higher.
The flexible composite phase change material provided by the invention can meet the layout of batteries and battery packs in various shapes, and a battery pack frame (such as a heating shell specifically) can be prepared in an injection molding mode, so that the flexible composite phase change material has good flexibility, small volume and light weight, and can well meet the requirement of thermal management of batteries of an unmanned aerial vehicle.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Heating 21 parts of SEBS and 49 parts of paraffin (the melting temperature is 44 ℃) and then uniformly mixing, wherein the ratio of the SEBS to the paraffin is 3:7, serving as a phase change material matrix; then adding two conductive fillers of carbon black and expanded graphite, uniformly mixing, wherein the mass part of the carbon black is 35 parts, the mass part of the expanded graphite is 1 part, and uniformly mixing to obtain a mixture; then putting the mixture into an open mill for open milling for 30min, wherein the open milling temperature is 135 ℃, and obtaining the flexible composite phase-change material;
and vulcanizing and molding the flexible composite phase change material at 135 ℃ to obtain the heating gasket with the thickness of 3 mm.
The heating gasket prepared by the embodiment has good flexibility and can be bent at will. Through a temperature-resistance experiment, the heating gasket is placed in a high-low temperature box for temperature rise and fall tests, and meanwhile, the resistance change condition of the material is recorded. As shown in FIG. 3, the resistance of the heating pad is small and basically unchanged at 0-40 ℃, and the resistance rises suddenly at 40-45 ℃ and is increased by 100-1000 times. The result shows that the flexible heating gasket prepared by the implementation has good positive temperature coefficient effect. Further, the heating pad was placed at an ambient temperature of-10 ℃ and a voltage of 2V was applied to the heating pad. The temperature of the gasket rises rapidly, and the initial current is 6A; as shown in fig. 4, when the pad temperature reaches about 35 ℃, the temperature does not substantially increase any more, and the heating current is only 0.4A. The result shows that the flexible heating gasket prepared by the embodiment can realize constant temperature heating and can be used for constant temperature preheating of the battery at low temperature.
Example 2
Heating 24 parts of SEBS and 48 parts of paraffin (the melting temperature is 44 ℃) and then uniformly mixing the SEBS and the paraffin in a ratio of 4:6 to serve as a phase change material matrix; then adding carbon black and expanded graphite conductive filler, and uniformly mixing, wherein the mass part of the carbon black is 20 parts, and the mass part of the expanded graphite is 5 parts, and uniformly mixing to obtain a mixture; then putting the mixture material into an open mill for open milling for 30min, wherein the open milling temperature is 135 ℃, and obtaining the flexible composite phase-change material;
and vulcanizing and molding the flexible composite phase change material at 135 ℃ to obtain the heating gasket with the thickness of 3 mm.
The heating gasket prepared by the embodiment is used for low-temperature preheating of the square lithium ion battery pack. Fig. 1 is a cross-sectional view of a battery low-temperature thermal management system of a square lithium ion battery pack, a heating gasket 1-1 and a square battery cell 3 form a sandwich structure, and the heating gasket 1-1 transfers heat to the battery cell 3 in a heat conduction manner, so as to preheat the battery cell 3. Copper sheets 2 are adhered to the edges of the upper end and the lower end of the heating gasket 1-1 to serve as electrodes, constant direct-current voltage is applied to the two ends of the electrodes, and current flows through the heating gasket 1-1 to generate joule heat, so that the battery monomer 3 is heated. The battery pack in this embodiment includes 4 square battery cells and 5 heating pads, and the heating pads 1-1 are connected in parallel. And (3) applying 4V direct current voltage to the heating gasket 1-1 at the ambient temperature of-10 ℃ and monitoring the surface temperature of the single battery 3. The time required for raising the temperature of the battery monomer 3 from-10 ℃ to 20 ℃ is 5 min.
Example 3
Heating 21 parts of SEBS and 49 parts of paraffin (the melting temperature is 44 ℃) and then uniformly mixing the SEBS and the paraffin in a ratio of 3:7 to serve as a phase change material matrix; then adding carbon black and expanded graphite conductive filler, and uniformly mixing, wherein the mass part of the carbon black is 20 parts, and the mass part of the expanded graphite is 5 parts, and uniformly mixing to obtain a mixture; then putting the mixture into an open mill for open milling for 30min, wherein the open milling temperature is 135 ℃, and obtaining the flexible composite phase-change material;
the flexible composite phase change material prepared in the embodiment is subjected to injection molding to obtain a battery heating shell 1-2, and as shown in fig. 2, the heating shell 1-2 is 125mm long, 90mm wide and 65mm high. The number of the battery holes is 15, the diameter of each battery hole is 18mm, and the single batteries 3 are inserted into the battery holes in an interference fit mode. Two copper sheets 2 are pasted on two sides of the battery pack heating shell 1-2 and used as electrodes for connecting external direct current voltage. And monitoring the temperature of the 6 battery monomers 3 at the upper left corner.
The battery pack prepared in the example was placed in an environment of-10 ℃, and a dc voltage of 5V was applied to the flexible material heating case 1-2, and the battery temperature was increased from-10 ℃ to 20 ℃ for 4 min. The heating rate of the heating shell to the battery monomer is 7.5 ℃/min.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. The flexible composite phase change material is characterized by comprising the following components in parts by mass:
20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material.
2. The flexible composite phase change material according to claim 1, wherein the spherical conductive filler comprises carbon black and/or spherical nickel powder.
3. The flexible composite phase change material of claim 1, wherein the multi-dimensional conductive filler comprises expanded graphite.
4. The flexible composite phase change material of claim 1, wherein the polymer matrix comprises a hydrogenated styrene-butadiene block copolymer.
5. The flexible composite phase change material of claim 1, wherein the organic phase change material comprises one or more of paraffin, alcohol compounds, and lipid compounds.
6. The preparation method of the flexible composite phase change material as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
mixing a polymer matrix, an organic phase change material, a spherical conductive filler and a multi-dimensional conductive filler to obtain a mixture;
and carrying out open milling on the mixture to obtain the flexible composite phase change material.
7. The application of the flexible composite phase change material as claimed in any one of claims 1 to 5 or the flexible composite phase change material prepared by the preparation method as claimed in claim 6 in an ion battery heating gasket or an ion battery heating shell.
8. An ion battery heating element is characterized by comprising an electric heating film and a heating electrode; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material according to any one of claims 1 to 5 or the flexible composite phase-change material prepared by the preparation method according to claim 6.
9. An ionic battery pack with a low temperature thermal management system, comprising an ionic battery pack and a plurality of heating pads; the ion battery pack comprises at least 2 ion battery cells; each 1 of the ion battery single bodies is arranged between any two adjacent heating gaskets; the heating pad comprises an electric heating film and a heating electrode electrically connected with the heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material according to any one of claims 1 to 5 or the flexible composite phase-change material prepared by the preparation method according to claim 6.
10. An ion battery pack with a low-temperature thermal management system is characterized by comprising an ion battery pack and a heating shell; the ion battery pack comprises at least 2 ion battery monomers, the heating shell is provided with battery holes matched with the ion battery monomers, and 1 ion battery monomer is arranged in 1 battery hole; the heating shell is of a honeycomb structure formed by an electric heating film, and the heating shell also comprises a heating electrode electrically connected with the electric heating film; the heating electrode is located at the edge of the electric heating film, and the electric heating film is prepared from the flexible composite phase-change material according to any one of claims 1 to 5 or the flexible composite phase-change material prepared by the preparation method according to claim 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589985A (en) * | 2023-07-17 | 2023-08-15 | 正通新捷科技(成都)有限公司 | Alloy phase change material for multi-temperature thermal management of lithium battery |
| CN118091488A (en) * | 2024-04-24 | 2024-05-28 | 宁德时代新能源科技股份有限公司 | Heating film short circuit fault detection method, heating film short circuit fault detection device, heating film short circuit fault detection equipment, storage medium and program product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109328390A (en) * | 2016-06-22 | 2019-02-12 | 纺织和塑料研究协会图林根研究院 | Conductive formed body with positive temperature coefficient |
| CN110336097A (en) * | 2019-06-05 | 2019-10-15 | 华南理工大学 | A kind of cascaded structure battery heating system based on electric heating composite phase-change material |
-
2022
- 2022-05-06 CN CN202210484520.9A patent/CN114867135A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109328390A (en) * | 2016-06-22 | 2019-02-12 | 纺织和塑料研究协会图林根研究院 | Conductive formed body with positive temperature coefficient |
| CN110336097A (en) * | 2019-06-05 | 2019-10-15 | 华南理工大学 | A kind of cascaded structure battery heating system based on electric heating composite phase-change material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589985A (en) * | 2023-07-17 | 2023-08-15 | 正通新捷科技(成都)有限公司 | Alloy phase change material for multi-temperature thermal management of lithium battery |
| CN116589985B (en) * | 2023-07-17 | 2023-12-26 | 正通新捷科技(成都)有限公司 | Alloy phase change material for multi-temperature thermal management of lithium battery |
| CN118091488A (en) * | 2024-04-24 | 2024-05-28 | 宁德时代新能源科技股份有限公司 | Heating film short circuit fault detection method, heating film short circuit fault detection device, heating film short circuit fault detection equipment, storage medium and program product |
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