CN117013063A - Corn type heat exchange piece coupled with hygroscopic hydrogel as well as preparation method and application thereof - Google Patents
Corn type heat exchange piece coupled with hygroscopic hydrogel as well as preparation method and application thereof Download PDFInfo
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- 235000002017 Zea mays subsp mays Nutrition 0.000 title claims abstract description 74
- 235000005822 corn Nutrition 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title abstract description 12
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- MFLKDEMTKSVIBK-UHFFFAOYSA-N zinc;2-methylimidazol-3-ide Chemical compound [Zn+2].CC1=NC=C[N-]1.CC1=NC=C[N-]1 MFLKDEMTKSVIBK-UHFFFAOYSA-N 0.000 claims description 3
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- 238000010438 heat treatment Methods 0.000 description 23
- 229910001416 lithium ion Inorganic materials 0.000 description 14
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Classifications
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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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
- 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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Abstract
The invention relates to a corn type heat exchange piece coupled with hygroscopic hydrogel, a preparation method and application thereof, and relates to the technical field of battery thermal management. According to the corn type heat exchange piece coupled with the hygroscopic hydrogel, the protrusions arranged in an array are arranged on the outer side surface of the corn type structure, so that the heat dissipation area is increased, the ultrahigh heat dissipation effect can be achieved in a heat exchange system, the ultrahigh cooling capacity is shown, and the cooling capacity at 49.96 ℃ can be achieved in the experimental process.
Description
Technical Field
The invention relates to the technical field of battery thermal management, in particular to a corn type heat exchange piece coupled with hygroscopic hydrogel, and a preparation method and application thereof.
Background
Both the charging and discharging processes of the battery generate heat, and if proper heat dissipation measures are not taken, the temperature of the battery may continue to rise, resulting in damage to or ignition of the battery, especially the lithium ion battery. The performance and lifetime of lithium ion batteries are directly affected by temperature, which can be damaged by either too high or too low a temperature. Meanwhile, the lithium ion battery can generate heat in the charge and discharge process, and if the heat cannot be well dissipated, overheat situation can occur, and even fire or explosion is caused. Therefore, a good thermal management system can effectively improve the life and safety of the lithium ion battery.
In order to ensure efficient and safe operation of the lithium ion battery under high-temperature climatic conditions and under high-rate charging conditions, the battery needs to be cooled at high temperature. In order to cope with the above problems, heat dissipation is performed on the lithium ion battery at a high temperature, and various battery thermal management systems have been developed in succession in the past several decades to cope with the cooling of the lithium ion battery under a high temperature condition. For the active battery thermal management strategy, the traditional air cooling mode is the most widely used cooling method, and the heat dissipation of the lithium battery by utilizing air convection has almost no technical difficulty, and is the best realized thermal management mode at present, but the mode has the problem of low cooling power when being used for heat dissipation of the lithium ion battery with high energy density, and particularly under the ultra-high temperature condition, the traditional air cooling mode can not achieve good effect on heat dissipation of the lithium ion battery working under the ultra-high temperature condition. Secondly, liquid cooling is another commercial heat dissipation mode with stronger heat dissipation capability, and because the liquid mostly has higher specific heat capacity, the liquid has the advantage that other heat dissipation modes do not have in the heat dissipation effect, but the liquid brings the cost of high weight, complex structure, extra power consumption and the like while bringing the efficient heat dissipation effect. And the presence of liquid presents a higher challenge to the tightness, pressure resistance and corrosion resistance of the device.
In recent years, passive battery thermal management strategies based on solid-liquid phase use of Phase Change Materials (PCMs) for battery thermal management have been considered as an effective way to dissipate heat from lithium ion batteries in high temperature environments, which exploit the fact that these materials possess a large heat absorption enthalpy during the solid-to-liquid phase transition. During the phase change process, the phase change material absorbs and stores a large amount of latent heat when melted; when the phase change material is cooled, the stored heat is emitted to the environment within a certain temperature range, and reverse phase transformation from liquid state to solid state is carried out, so that reversible circulation is realized. The passive strategy based on PCMS has the advantages of quick temperature control, good temperature uniformity, low energy consumption and the like. The phase change material has the advantages of chemical stability, no toxicity, easy processing, high heat transfer speed and the like, so that the solid-liquid phase change cooling technology is widely applied. However, in order to overcome the major disadvantage of poor PCMS heat transfer performance, recent studies have been focused on improving PCMS heat conductivity by synthesizing phase change composite materials with high heat conductive additives. Compared with the solid-liquid phase transformation process, the liquid-gas phase transformation process has higher latent heat, so that the liquid-gas phase transformation process has more excellent capability in the heat dissipation process. The phase change process of these phase change materials is accompanied by release or absorption of latent heat, which makes the phase change materials more efficient in storing and releasing energy than conventional materials. The latent heat value of a phase change material is typically several orders of magnitude higher than that of a chemical fuel, which means that the phase change material can store more energy and thus achieve higher energy efficiency. However, the research of the phase change material on battery thermal management at present has a far-reaching heat dissipation effect under partial special conditions. In view of this, the invention provides a corn type heat exchange member coupled with hygroscopic hydrogel, and a preparation method and application thereof.
Disclosure of Invention
The invention aims to solve the technical problem of providing a corn type heat exchange piece coupled with hygroscopic hydrogel, and a preparation method and application thereof. The purpose is to regulate the temperature of the battery in an ultra-high temperature environment.
In order to solve the technical problems, the first aspect of the invention provides a corn type heat exchange member coupled with hygroscopic hydrogel, the corn type heat exchange member comprises a corn type structure and a hygroscopic hydrogel layer, one side surface of the corn type structure is provided with protrusions arranged in an array, and the whole outer surface of the corn type structure is coupled with the hygroscopic hydrogel layer.
The corn structure has a corn grain protruding structure.
The principle of the invention is as follows: the heat exchange piece based on adsorption-analysis refrigeration mode, corn type heat exchange piece includes corn type structure and hygroscopicity hydrogel layer, be provided with the protrusion of array arrangement on the outside surface of corn type structure, have the protrusion of array arrangement that corn granule is like promptly, just be coupled with on the whole surface of corn type structure hygroscopicity hydrogel layer, hygroscopicity hydrogel layer is as the adsorbent refrigerates through adsorption-analysis water, and can self-regeneration and cyclic utilization in the heat exchange system, and this kind of heat exchange system can demonstrate the surprise cooling capacity simultaneously.
The coupling physics mentioned above refers to the phenomenon that two or more systems affect each other by interaction and thus combine.
The beneficial effects of the invention are as follows:
(1) According to the corn type heat exchange piece of the coupling hygroscopic hydrogel, the protrusions arranged in an array are arranged on the surface of one side of the corn type structure, so that the heat dissipation area is increased, an ultrahigh heat dissipation effect can be achieved in a heat exchange system, an ultrahigh cooling capacity is shown, and the cooling capacity of 49.96 ℃ can be achieved in the laboratory experiment process.
(2) The hygroscopic hydrogel layer used in the invention has excellent hydrophilic performance, can absorb moisture from air to complete self-replenishment of the moisture, and has no extra energy consumption and self-circulation in a heat exchange system, namely, realizes self-regeneration and recycling.
(3) The corn type heat exchange piece coupled with the hygroscopic hydrogel has low cost when the hygroscopic hydrogel layer is used, and is suitable for industrialized popularization.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the corn-shaped structure is composed of 2 hollow semi-cylinders with symmetrical central axes, and the outer side surface of each hollow semi-cylinder is provided with protrusions which are arranged in an array.
Wherein, two hollow semi-cylinders with symmetrical central axes can be connected by a buckle or a nut. In addition, the corn-type structure may be any shape structure having protrusions arranged in an array, for example, a plate-type structure having protrusions arranged in an array, a hollow cone-type structure, etc., depending on the specific field of use.
Further, the shape of the protrusion is any one or a combination of at least two of a cylinder, a cone, a hemisphere, and a prism.
Further, the thickness of the hygroscopic hydrogel layer is equal to or greater than the height of the protrusions. The thickness of the absorbent hydrogel layer may be tailored to the specific situation, and it is desirable to provide the absorbent hydrogel with a thickness that completely encapsulates the protrusions to increase the heat dissipation area.
The second aspect of the invention provides a preparation method of the corn-type heat exchange piece based on the coupling hygroscopic hydrogel, which comprises the following steps:
(S1) preparing a corn structure;
(S2) sequentially adding a monomer, a crosslinking agent, a hygroscopic agent and an initiator into deionized water, and uniformly stirring to obtain a homogeneous solution of a hygroscopic hydrogel precursor;
and (S3) placing the homogeneous phase solution of the hygroscopic hydrogel precursor and the corn-type structure into a mold, and then irradiating the mold by using ultraviolet lamps to perform coupling reaction, and coupling the homogeneous phase solution and the corn-type structure on the whole outer surface of the corn-type structure to form a hygroscopic hydrogel layer, so as to prepare the corn-type heat exchange piece of the coupled hygroscopic hydrogel.
The corn type heat exchange piece coupling the hygroscopic hydrogel has the advantages that the preparation mode of coupling the hygroscopic hydrogel to the corn type structure is simple, the preparation is convenient, the cost is low, and the corn type heat exchange piece coupling the hygroscopic hydrogel is suitable for industrial popularization.
Further, the corn-type structure in the step (S1) is prepared by a laser sintering 3D printing technology. The 316L stainless steel material was printed using HBD E500 metal 3D printer equipment manufactured by hanbang technology.
Further, in the step (S2), the monomer is acrylamide, the crosslinking agent is N, N' methylene bisacrylamide, the moisture absorbent is calcium chloride, lithium chloride, zinc chloride or MOF, and the initiator is ammonium persulfate.
Further, the ratio of the mass concentration of the monomer, the crosslinking agent and the initiator is (1-4): (0.005-0.02): (0.115-0.46); the weight of the moisture absorbent accounts for 17.5-52.5% of the weight of the homogeneous solution of the moisture absorbent hydrogel precursor. Specifically, the ratio of the mass concentration of the monomers, the crosslinking agent and the initiator is 2:0.01:0.23; the moisture absorbent accounts for 35% of the weight of the homogeneous solution of the moisture absorbent hydrogel precursor.
Further, in the step (S3), the coupling reaction is specifically: the power density is 3-5 mW.cm -2 Is irradiated under 365nm LED ultraviolet lamp for 10-20min. Specifically, the coupling reaction is specifically: the power density is 4mW cm -2 Is irradiated under 365nm LED ultraviolet lamp for 15min.
Specifically, the preparation method of the corn type heat exchange piece based on the coupling hygroscopic hydrogel comprises the following steps:
(1) Preparing a corn type structure with good heat conducting property by using a laser sintering 3D printing technology;
(2) Using 2mol/L acrylamide (AAm) as monomer, 0.01mol/L N, N' -methylenebisacrylamide (BIS) as cross-linking agent, stirring and dissolving in 30ml deionized water, and adding calcium chloride (CaCl) 2 ) The moisture absorbent is fully ultrasonically cleaned by an ultrasonic cleaner to be completely dissolved, and thenAdding 0.23mol/L Ammonium Persulfate (APS) as a reaction initiator, and stirring and mixing uniformly to obtain a homogeneous solution of the hygroscopic hydrogel precursor taking AAm as a monomer;
(3) Filling the resulting homogeneous solution of the hygroscopic hydrogel precursor with AAm as monomer into a custom made polymethyl methacrylate mold containing the corn structure at a power density of 4mW cm at room temperature (about 25 ℃) -2 After 15min of irradiation under 365nm LED ultraviolet lamp, the 3D printed corn structure coupled with pAAm@CaCl is obtained 2 The corn type heat exchange piece coupled with the hygroscopic hydrogel is obtained by the water-based high molecular copolymer.
The third aspect of the invention provides an application of the corn type heat exchange element coupled with the hygroscopic hydrogel, wherein the corn type heat exchange element coupled with the hygroscopic hydrogel is used in a battery thermal management system.
The battery thermal management is a new technology which is based on the optimal charge-discharge temperature interval of a specific battery according to the influence of temperature on the battery performance, combines the electrochemical characteristics and the heat generation mechanism of the battery, is established on the basis of multiple subjects and fields such as materiality, electrochemistry, heat transfer science, molecular dynamics and the like through reasonable design, and aims to solve the problem of heat dissipation or thermal runaway caused by the operation of the battery under the condition of overhigh or overlow temperature so as to improve the overall performance of the battery.
According to the corn-type heat exchange piece coupled with the hygroscopic hydrogel, the local temperature of the battery automatically switches the heating or cooling of the battery according to the water absorption or desorption state of the adsorbent, and the liquid-free operation is adopted, so that the adsorption-based battery thermal management strategy is very suitable for thermal management of electronic equipment/batteries, and is used in a battery thermal management system, the ultrahigh heat dissipation effect can be achieved in the heat exchange system, the ultrahigh cooling capacity is shown, and the cooling capacity at 49.96 ℃ can be achieved in the experimental process.
Drawings
FIG. 1 is a flow chart of a process for preparing a corn heat exchange member coupled with a hygroscopic hydrogel of the present invention;
FIG. 2 is a schematic illustration of a corn structure of the present invention used in a battery thermal management system;
FIG. 3 is a schematic illustration of the corn heat exchange member of the present invention coupled with a hygroscopic hydrogel for use in a battery thermal management system;
FIG. 4 is a graph of experimental heat dissipation data for a corn heat exchanger of a coupled hygroscopic hydrogel of the present invention under 2W heating with a blank control experimental set;
FIG. 5 is a graph of experimental heat dissipation data for a corn heat exchanger of a coupled hygroscopic hydrogel of the present invention under 3W heating with a blank control experimental set;
FIG. 6 is a graph of experimental heat dissipation data for a corn heat exchanger of a coupled hygroscopic hydrogel of the present invention under 4W heating with a blank control experimental set;
FIG. 7 is a graph of experimental data of water loss and water absorption under different heating power simulations under the condition that a heating rod is used for simulating the heating of a lithium battery;
FIG. 8 is a schematic representation of the surface contact angle of a coupled hygroscopic hydrogel of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1-maize formula structure, 2-hydroscopic hydrogel layer, 3-lithium ion battery.
Detailed Description
The principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment relates to a corn type heat exchange member (as shown in fig. 2 and 3) coupled with a hygroscopic hydrogel, the corn type heat exchange member comprises a corn type structure 1 and a hygroscopic hydrogel layer 2, the outer side surface of the corn type structure 1 is provided with protrusions arranged in an array, and the whole outer surface of the corn type structure 1 is coupled with the hygroscopic hydrogel layer 2.
Preferably, the corn-shaped structure 1 is composed of two hollow semi-cylinders with symmetrical central axes, and the outer side surface of each hollow semi-cylinder is provided with protrusions arranged in an array. The shape of the protrusion is any one or a combination of at least two of a cylinder, a cone, a hemisphere and a prism. The thickness of the hygroscopic hydrogel layer 2 is equal to or greater than the height of the protrusions.
In a specific use, the corn-shaped heat exchange member coupled with the hygroscopic hydrogel can be sleeved on the outer surface of the lithium ion battery 3 (as shown in fig. 2 and 3).
Example 2
The embodiment relates to a preparation method (as shown in fig. 1) of a corn-type heat exchange piece based on the coupling hygroscopic hydrogel, which comprises the following steps:
(S1) preparing corn structure 1;
(S2) sequentially adding a monomer, a crosslinking agent, a hygroscopic agent and an initiator into deionized water, and uniformly stirring to obtain a homogeneous solution of a hygroscopic hydrogel precursor;
and (S3) placing the homogeneous phase solution of the hygroscopic hydrogel precursor and the corn type structure 1 into a mold, and then irradiating the mold by ultraviolet lamps to perform coupling reaction to prepare the corn type heat exchange piece of the coupled hygroscopic hydrogel.
Preferably, the corn-shaped structure 1 in the step (S1) is prepared by a laser sintering 3D printing technology. In the step (S2), the monomer is acrylamide, the crosslinking agent is N, N' -methylene bisacrylamide, the moisture absorbent is calcium chloride, lithium chloride, zinc chloride or MOF, and the initiator is ammonium persulfate. The ratio of the mass concentration of the monomer, the crosslinking agent and the initiator is (1-4): (0.005-0.02): (0.115-0.46); the weight of the moisture absorbent accounts for 17.5-52.5% of the weight of the homogeneous solution of the moisture absorbent hydrogel precursor. In the step (S3), the coupling reaction is specifically: the power density is 3-5 mW.cm -2 Is irradiated under 365nm LED ultraviolet lamp for 10-20min.
Specifically, the preparation method of the corn type heat exchange piece based on the coupling hygroscopic hydrogel comprises the following steps:
(S1) preparing a corn type structure 1 with good heat conducting property by using a laser sintering 3D printing technology; printing 316L stainless steel material by using HBD E500 metal 3D printer equipment produced by Hanbang technology;
(S2) use of 2mol/L acrylAmine (AAm) as monomer, 0.01mol/L N, N' -methylenebisacrylamide (BIS) as crosslinking agent, and adding calcium chloride (CaCl) 2 ) Fully ultrasonic is adopted as a moisture absorbent by using an ultrasonic cleaner to dissolve the moisture absorbent completely, then 0.23mol/L Ammonium Persulfate (APS) is added as a reaction initiator, and the mixture is stirred and mixed uniformly to obtain a homogeneous phase solution of a moisture absorbent hydrogel precursor taking AAm as a monomer;
(S3) filling the resulting homogeneous solution of the hygroscopic hydrogel precursor with AAm as the monomer into a custom made polymethylmethacrylate mold with corn structure 1 at room temperature (about 25 ℃ C.) at a power density of 4mW cm -2 After 15min of irradiation under 365nm LED ultraviolet lamp, pAAm@CaCl coupled to 3D printed corn structure 1 was obtained 2 The corn type heat exchange piece coupled with the hygroscopic hydrogel is obtained by the water-based high molecular copolymer.
FIG. 1 is a flow chart of a process for preparing a corn heat exchange member coupled with a hygroscopic hydrogel of the present invention; wherein (a) is a homogeneous solution of the configured hygroscopic hydrogel precursor; (b) ultraviolet LED lamp sources used for polymerization; (c) Custom molds for placing 3D printed corn structure 1; (d) A schematic diagram of 18650 lithium ion battery 3 equipped with the heat exchange member of the invention; (e) For pAAm@CaCl 2 Three-dimensional schematic representation of the internal three-dimensional network structure of a water-based high molecular copolymer (hygroscopic hydrogel), which is a three-dimensional network structure of monomers crosslinked by a crosslinking agent; (f) For pAAm@CaCl 2 Attachment of water-based high molecular copolymer to 3D printed corn structure 1; (g) For plane representation pAAm@CaCl 2 A network mechanism formed by interaction of the internal monomer of the water-based high polymer copolymer and the cross-linking agent; (h) For pAAm@CaCl 2 Schematic appearance of water-based high molecular copolymer.
Test examples
The experimental example was carried out using the corn type heat exchange member coupled with the hygroscopic hydrogel prepared in example 2.
(1) Heat dissipation test: acrylamide (C) 3 H 5 NO) and calcium chloride (CaCl) 2 ) Purchased from the national medicine control stock. N, N' -methylenebisacrylamide (C) 7 H 10 N 2 O 2 ) Purchased from Shanghai Ara Ding Shenghua technologies Inc. Ammonium persulfate (H) 8 N 2 O 8 S 2 ) Purchased from Shanghai Michlin Biochemical technologies Co. In the experimental process, a cylindrical direct current heating rod manufactured by new heat energy technology limited company in commission is adopted to replace the high temperature condition under the working of the lithium ion battery. Experiments were performed at ambient temperature of 22 ℃ and relative humidity of 65% directly comparing the heat bars exposed to air by air convection (control) and corn heat exchangers equipped with such coupled hygroscopic hydrogels, and the temperature changes were recorded with the same heating power using a thermocouple temperature collector (Pico TC-08) connected to a computer.
(2) Experiment of water loss and absorption: the experiment is carried out in a room temperature environment with the environment temperature of 22 ℃ and the relative humidity of 65%, the mass change of an experiment system is recorded by adopting an electronic balance (Mettler Toledo-204) connected with a computer, the moisture in the hygroscopic hydrogel is analyzed in the heating process of a direct current heating rod, the mass is reduced, and when the direct current heating rod stops working, the temperature is reduced, and hygroscopic salt in the hydrogel can absorb the water vapor in the air to supplement the moisture scattered in the heating process.
(3) Method for detecting surface contact angle: contact angle of the copolymer hydrogel at various locations with deionized water was measured using a contact angle meter (OCA 20).
FIGS. 4-6 are graphs of experimental heat dissipation data for corn heat exchange elements coupled with hygroscopic hydrogels of a control experimental group under different heating conditions; under the condition that the heating rod is used for simulating the heating of a lithium battery, the temperature of the corn type heat exchange piece using the coupled hygroscopic hydrogel is reduced by 49.96 ℃ compared with that of a control group under the heating power of 4W.
Fig. 7 is a graph of experimental data of water loss and water absorption under the simulation of different heating powers under the condition that a heating rod is used for simulating the heating of a lithium battery; simulation by different heating powers under conditions of simulating heating of lithium battery using heating rodThe experimental data graph of lower water loss and water absorption shows that pAAm@CaCl prepared by the invention 2 The water-based high molecular copolymer (hygroscopic hydrogel) can accomplish self-absorption of water in the air to supplement the water consumed during the heat dissipation.
Wherein FIG. 8 shows pAAm@CaCl 2 The surface contact angle of the water-based high molecular copolymer (hygroscopic hydrogel) is only 20.21 degrees, and the surface of the water-based high molecular copolymer has very good hydrophilicity.
In summary, according to the corn-type heat exchange piece of the coupling hygroscopic hydrogel, the protrusions arranged in an array are arranged on the outer side surface of the corn-type structure, so that the heat dissipation area is increased, the ultrahigh heat dissipation effect can be achieved in a heat exchange system, the ultrahigh cooling capacity is shown, and the cooling capacity at 49.96 ℃ can be achieved in the laboratory experiment process. Hygroscopic hydrogel layers useful in the present invention (e.g., pAAm@CaCl 2 The water-based high polymer copolymer) has excellent hydrophilic performance, can absorb moisture from air to complete self-replenishment of the moisture, and has no extra energy consumption and self-circulation in a heat exchange system, namely, realizes self-regeneration and recycling.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The corn type heat exchange piece of coupling hygroscopicity hydrogel is characterized in that, corn type heat exchange piece includes corn type structure (1) and hygroscopicity hydrogel layer (2), be provided with the protrusion of array arrangement on the outside surface of corn type structure (1), the coupling has on the whole surface of corn type structure (1) hygroscopicity hydrogel layer (2).
2. The corn heat exchange member coupled with a hygroscopic hydrogel as claimed in claim 1, wherein the corn-shaped structure (1) is composed of 2 hollow semi-cylinders with central axis symmetry, and each of the hollow semi-cylinders is provided with protrusions arranged in an array on an outer side surface thereof.
3. The corn heat exchange element coupled to a hygroscopic hydrogel of claim 1 or 2, wherein the protrusions are any one or a combination of at least two of cylindrical, conical, hemispherical, prismatic in shape.
4. Corn heat exchange element coupled with hygroscopic hydrogel according to claim 1 or 2, characterized in that the thickness of the hygroscopic hydrogel layer (2) is equal to or larger than the height of the protrusions.
5. A method for preparing a corn heat exchange element based on a coupled hygroscopic hydrogel as claimed in any one of claims 1 to 4, characterized by comprising the steps of:
(S1) preparing a corn type structure (1);
(S2) sequentially adding a monomer, a crosslinking agent, a hygroscopic agent and an initiator into deionized water, and uniformly stirring to obtain a homogeneous solution of a hygroscopic hydrogel precursor;
and (S3) placing the homogeneous phase solution of the hygroscopic hydrogel precursor and the corn-type structure (1) into a mold, and then irradiating the mold by adopting ultraviolet lamps to perform coupling reaction, and coupling the whole outer surface of the corn-type structure (1) to form a hygroscopic hydrogel layer (2) to prepare the corn-type heat exchange piece of the coupled hygroscopic hydrogel.
6. The method of claim 5, wherein the corn-shaped structure (1) in the step (S1) is prepared by a laser sintering 3D printing technology.
7. The method of claim 5, wherein in the step (S2), the monomer is acrylamide, the crosslinking agent is N, N' methylenebisacrylamide, the moisture absorbent is calcium chloride, lithium chloride, zinc chloride or MOF, and the initiator is ammonium persulfate.
8. The method for producing a corn heat exchanger coupled with a hygroscopic hydrogel as claimed in claim 7, wherein the ratio of the mass concentration of the monomer, the crosslinking agent and the initiator is (1-4): (0.005-0.02): (0.115-0.46); the weight of the moisture absorbent accounts for 17.5-52.5% of the weight of the homogeneous solution of the moisture absorbent hydrogel precursor.
9. The method for producing a corn heat exchanger coupled with a hygroscopic hydrogel as claimed in claim 5, wherein in step (S3), the coupling reaction is specifically: the power density is 3-5 mW.cm -2 Is irradiated under 365nm LED ultraviolet lamp for 10-20min.
10. Use of a corn heat exchange element according to any one of claims 5 to 9 coupled to a hygroscopic hydrogel, wherein the corn heat exchange element coupled to a hygroscopic hydrogel is used in a battery thermal management system.
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