CN115612460A - Phase-change material for lithium ion battery thermal management system - Google Patents

Phase-change material for lithium ion battery thermal management system Download PDF

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CN115612460A
CN115612460A CN202211252923.7A CN202211252923A CN115612460A CN 115612460 A CN115612460 A CN 115612460A CN 202211252923 A CN202211252923 A CN 202211252923A CN 115612460 A CN115612460 A CN 115612460A
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change material
lithium ion
thermal management
phase change
ion battery
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刘晓磊
王德钊
王宇
王登辉
王夫良
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Hefei Guoxuan Recycling Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
    • 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
    • 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
    • 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
    • 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 provides a phase-change material for a lithium ion battery thermal management system, which comprises the following components in percentage by mass: 85-92% of sodium acetate trihydrate, 3-5% of cellulose and 5-10% of organic silicon pouring sealant. The phase change material for the lithium ion battery thermal management system provided by the invention has the advantages of good shape stability, high thermal conductivity and large phase change latent heat, and when the phase change material is applied to the lithium ion battery thermal management system, the temperature of a battery module can be effectively reduced, and the temperature uniformity of the battery module can be improved.

Description

Phase-change material for lithium ion battery thermal management system
Technical Field
The invention relates to the technical field of phase change energy storage materials, in particular to a phase change material for a lithium ion battery thermal management system.
Background
The lithium ion battery is accompanied by a series of complex electrochemical reactions in the charging and discharging process and is very sensitive to temperature. The capacity of the lithium ion battery is rapidly reduced due to low temperature, and instant overcharge and even lithium separation phenomena can occur during charging at low temperature, so that internal short circuit of the lithium ion battery is caused. The heat of the lithium ion battery can be accumulated due to long-term high-temperature overheating, so that the internal diaphragm is melted to cause short circuit, and finally the lithium ion battery is smoked, ignited and even exploded.
Generally, the suitable temperature for operation of lithium batteries is 20-50 ℃ and the maximum temperature difference in the battery pack should be less than 5 ℃. The battery can obtain the best cycle performance and service life in the temperature range. In order to ensure the best performance of the power battery and avoid safety accidents caused by overhigh temperature or thermal runaway, thermal management of the power battery is very necessary. The thermal management system can realize the temperature control of the lithium ion battery.
Lithium ion battery thermal management systems can be divided into active thermal management systems and passive thermal management systems. The active thermal management system takes away the heat of the battery through heat exchange media such as air and liquid, so that the purpose of cooling the battery is achieved. The air heat management system has the advantages of simple structure, light weight, low energy consumption, easy maintenance, mature technology and application in commercial vehicles; but the cooling effect of the air cooling system is poor, and when the heat productivity of the battery is large, the temperature distribution of the battery pack is easy to be uneven, and even the temperature control requirement cannot be met. The liquid cooling has larger convection heat transfer coefficient and higher cooling capacity, and is also widely applied to cooling power batteries; however, such a battery thermal management system based on liquid cooling requires additional complex piping and auxiliary equipment such as pumps, which results in a more complex structure, a higher weight and a higher cost of the system, and also risks leakage.
Passive thermal management systems, such as heat pipe thermal management and phase change material thermal management, are simple in construction, do not require complex and bulky auxiliary equipment, and do not require the consumption of additional energy. The heat pipe thermal management utilizes the excellent heat-conducting property of the heat pipe, and can quickly take away the heat generated by the battery so as to achieve the purpose of cooling the battery. However, the shape of the heat pipe itself limits its use to a specific shape of battery, and it is more used as a heat conducting tool for an active cooling system. When the phase change material is applied to a battery thermal management system, a large amount of heat can be absorbed and the temperature is kept basically unchanged during phase change, and the characteristic just can meet the requirement of battery thermal management.
Since Al-HALLAJ et Al first proposed the use of phase change materials in the thermal management of lithium ion batteries (AL-HALLAJ S, SELMAN J R. Thermal modification of second lithium ion batteries for electric/hybrid electric applications. Journal of Power resources, 2002, 110 (2): 341-348), researchers have found by way of numerical simulations that the temperature of a battery containing phase change materials can be reduced by about 8 ℃ under near adiabatic conditions. A series of experiments and numerical simulations following this also demonstrated the effectiveness of the phase change material in a battery thermal management system. However, when the existing phase change material is applied to a battery thermal management system, the application is limited by the performance of the material, such as low thermal conductivity and easy leakage, so that the battery module of the thermal management system applying the phase change material is often poor in temperature uniformity and needs a complex sealing structure.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a phase change material for a lithium ion battery thermal management system, the phase change material has good shape stability, high thermal conductivity and large phase change latent heat, and when the phase change material is applied to the lithium ion battery thermal management system, the temperature of a battery module can be effectively reduced, and the temperature uniformity of the battery module can be improved.
The invention provides a phase-change material for a lithium ion battery thermal management system, which comprises the following components in percentage by mass: 85-92% of sodium acetate trihydrate, 3-5% of cellulose and 5-10% of organic silicon pouring sealant.
In the invention, sodium acetate trihydrate is used as a main phase change material, so that the phase change temperature suitable for the working of the lithium ion battery can be obtained; the cellulose increases the viscosity of the sodium acetate trihydrate in a liquid state, so that the phase separation of sodium acetate crystals and water is effectively prevented; the organic silicon pouring sealant forms a supporting material of sodium acetate trihydrate, and the overall thermal conductivity and the forming stability of the phase change material can be greatly improved.
Preferably, the purity of the sodium acetate trihydrate is more than 99%.
Preferably, the cellulose is at least one of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose or hydroxypropyl methyl cellulose.
Preferably, the organic silicon pouring sealant is an addition type bi-component organic silicon pouring sealant;
preferably, the organic silicon pouring sealant is obtained by adding graphene oxide into a conventional addition type bi-component organic silicon pouring sealant;
preferably, the addition amount of the graphene oxide is 5-20wt% of the conventional addition type two-component organic silicon pouring sealant.
According to the invention, the graphene oxide is added into the organic silicon pouring sealant, and functional groups such as hydroxyl, carboxyl and the like contained in the graphene oxide can form hydrogen bond composition with the sodium acetate trihydrate, so that the uniform distribution of the sodium acetate trihydrate in the organic silicon pouring sealant is promoted, and the heat storage and heat conduction performances of the phase-change material are further enhanced.
Preferably, the conventional addition-type two-component silicone pouring sealant comprises components a and B;
the component A comprises the following components in parts by weight: 20-40 parts of vinyl silicone oil, 1-10 parts of dimethyl silicone oil, 1-20 parts of micro-nano heat-conducting filler and 0.1-2 parts of platinum catalyst; the component B comprises the following components in parts by weight: 20-50 parts of vinyl silicone oil, 5-20 parts of hydrogen-containing silicone oil, 1-20 parts of micro-nano heat-conducting filler and 0.1-1 part of methylbutinol;
preferably, the micro-nano heat conducting filler is at least one of silica micropowder, silica, magnesium oxide, aluminum oxide or zinc oxide.
Preferably, a preparation method of the phase change material for the lithium ion battery thermal management system comprises the following steps:
and adding sodium acetate trihydrate into the reaction vessel, sealing, heating and melting into liquid, sequentially adding cellulose and organic silicon pouring sealant, stirring and mixing uniformly, and curing and forming to obtain the phase-change material.
Preferably, the heating and melting temperature is 70-90 ℃ and the time is 15-30min.
Preferably, the phase change temperature of the phase change material is 54-60 ℃, and the latent heat of phase change is more than 190J/g.
The invention also provides a lithium ion battery thermal management system which comprises the phase change material.
Preferably, the thermal management system specifically comprises a battery thermal management assembly and a lithium ion battery module, wherein the battery thermal management assembly is made of the phase change material and is attached to the lithium ion battery module.
The phase-change material is prepared by taking cellulose as a thickening agent and organic silicon pouring sealant as a supporting material on the basis of a main phase-change material of sodium acetate trihydrate and optimizing the proportion of the raw materials.
When the phase change material is applied to a lithium ion battery thermal management system, the melting point is about 54 ℃, the supercooling degree is about 30 ℃, and when the lithium ion battery works and the temperature is higher than 54 ℃, heat generated by the lithium ion battery can be absorbed and transferred quickly, so that the aim of cooling the battery is fulfilled; when the temperature reaches 25 ℃, heat is gradually released to ensure the temperature of the battery, so that the heat is absorbed near the melting point of high temperature, and the heat is released near the freezing point of low temperature, the working temperature among battery cores tends to be consistent, and the working performance of the lithium ion battery is best exerted.
The phase-change material is sealed in the organic silicon pouring sealant, is in a solid state no matter heated or solidified, and the forming shape of the phase-change material is not changed, so that the phase-change material does not corrode a battery, is controllable in required space, can be formed according to requirements, does not need to be packaged outside the phase-change material to prevent leakage, reduces occupied space, and meets the standard that the volume of the battery occupies the maximum volume of a module; the volume of the phase-change material cannot expand due to repeated heating and melting, gas cannot be generated in the phase-change process to damage the battery module, and fragments cannot be generated; simultaneously phase change material is the solid that has certain soft elasticity, can be more unanimous with electric core and battery module bottom surface laminating degree to when battery module vibration, fall and striking, can have good guard action to the battery core, improved battery module's security and environmental suitability.
Drawings
Fig. 1 is a schematic structural diagram of a phase change material obtained in an embodiment of the present invention.
Detailed Description
Hereinafter, the technical solution of the present invention will be described in detail by specific examples, but these examples should be explicitly proposed for illustration, but should not be construed as limiting the scope of the present invention.
Example 1
A phase change material for a lithium ion battery thermal management system comprises the following components in percentage by mass: 92% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 5% of organic silicon pouring sealant;
the phase-change material is prepared by the following method:
adding sodium acetate trihydrate into a reaction container, sealing, heating and melting at 80 ℃ for 20min, adding carboxymethyl cellulose, stirring and mixing uniformly, adding organic silicon pouring sealant, stirring and mixing uniformly, placing in a mold, standing for 1.5h, and curing and molding to obtain the phase-change material;
in this embodiment, the organic silicon pouring sealant is obtained by adding graphene oxide to a conventional addition-type bi-component organic silicon gel, and specifically includes: uniformly mixing 30 parts of vinyl silicone oil, 5 parts of dimethyl silicone oil, 10 parts of silicon micropowder and 0.8 part of platinum catalyst to prepare a component A; uniformly mixing 35 parts of vinyl silicone oil, 10 parts of hydrogen-containing silicone oil, 10 parts of silicon micropowder and 0.4 part of methylbutinol to prepare a component B; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 1.
The structure of the phase change material obtained in this example is schematically shown in fig. 1 below.
Example 2
A phase change material for a lithium ion battery thermal management system comprises the following components in percentage by mass: 87% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 10% of organic silicon pouring sealant;
the phase change material is prepared by the following method:
adding sodium acetate trihydrate into a reaction container, sealing, heating and melting at 80 ℃ for 20min, adding carboxymethyl cellulose, stirring and mixing uniformly, adding organic silicon pouring sealant, stirring and mixing uniformly, placing in a mold, standing for 1.5h, and curing and molding to obtain the phase-change material;
in this embodiment, the organic silicon pouring sealant is obtained by adding graphene oxide to a conventional addition-type bi-component organic silicon gel, and specifically includes: uniformly mixing 30 parts of vinyl silicone oil, 5 parts of dimethyl silicone oil, 10 parts of silicon micropowder and 0.8 part of platinum catalyst to prepare a component A; evenly mixing 35 parts of vinyl silicone oil, 10 parts of hydrogen-containing silicone oil, 10 parts of silicon micropowder and 0.4 part of methyl butynol to prepare a component B; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 1.
Example 3
A phase change material for a lithium ion battery thermal management system comprises the following components in percentage by mass: 90% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 7% of organic silicon pouring sealant;
the phase change material is prepared by the following method:
adding sodium acetate trihydrate into a reaction container, sealing, heating and melting at 80 ℃ for 20min, adding carboxymethyl cellulose, stirring and mixing uniformly, adding organic silicon pouring sealant, stirring and mixing uniformly, placing in a mold, standing for 1.5h, and curing and molding to obtain the phase-change material;
in this embodiment, the organic silicon pouring sealant is obtained by adding graphene oxide to a conventional addition-type bi-component organic silicon gel, and specifically includes: uniformly mixing 30 parts of vinyl silicone oil, 5 parts of dimethyl silicone oil, 10 parts of silicon micropowder and 0.8 part of platinum catalyst to prepare a component A; uniformly mixing 35 parts of vinyl silicone oil, 10 parts of hydrogen-containing silicone oil, 10 parts of silicon micropowder and 0.4 part of methylbutinol to prepare a component B; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 1.
Example 4
A phase change material for a lithium ion battery thermal management system comprises the following components in percentage by mass: 90% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 7% of organic silicon pouring sealant;
the phase change material is prepared by the following method:
adding sodium acetate trihydrate into a reaction container, sealing, heating and melting at 80 ℃ for 20min, adding carboxymethyl cellulose, stirring and mixing uniformly, adding organic silicon pouring sealant, stirring and mixing uniformly, placing in a mold, standing for 1.5h, and curing and molding to obtain the phase-change material;
in this embodiment, the organic silicon pouring sealant is obtained by adding graphene oxide to a conventional addition-type bi-component organic silicon gel, and specifically includes: adding 5 parts of graphene oxide into a mixture of 30 parts of vinyl silicone oil, 5 parts of dimethyl silicone oil, 10 parts of silicon micropowder and 0.8 part of platinum catalyst, and uniformly mixing to prepare a component A; adding 5 parts of graphene oxide into a mixture of 35 parts of vinyl silicone oil, 10 parts of hydrogen-containing silicone oil, 10 parts of silicon micropowder and 0.4 part of methylbutynol, and uniformly mixing to prepare a component B; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 1.
Comparative example 1
A phase change material for a lithium ion battery thermal management system, which is different from the phase change material in example 1 in that the phase change material comprises the following components in percentage by mass: 82% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 15% of organic silicon pouring sealant.
Comparative example 2
A phase change material for a lithium ion battery thermal management system, which is different from the phase change material of example 1 in that the phase change material comprises the following components in percentage by mass: 77% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 20% of organic silicon pouring sealant.
Comparative example 3
A phase change material for a lithium ion battery thermal management system, which is different from the phase change material of example 1 in that the phase change material comprises the following components in percentage by mass: 72% of sodium acetate trihydrate, 3% of carboxymethyl cellulose and 25% of organic silicon pouring sealant.
And (3) performance testing:
thermal conductivity test: the phase change materials described in the examples and comparative examples were tested for thermal conductivity using ISO 22007-2 determination of thermal conductivity and thermal diffusivity for plastics, part 2, instant planar Heat Source (Hot plate) method.
Testing phase change temperature and phase change enthalpy: the phase change materials described in the respective examples and comparative examples were tested for phase change temperature and latent heat of phase change using a Differential Scanning Calorimetry (DSC) method.
And (3) testing the cycling stability: and (3) adopting a low-temperature tank, a water bath and a multi-channel thermometer, carrying out heating and cooling circulation on the phase-change materials in the embodiments and the comparative examples at 30-75 ℃, and testing the phase-change temperature and the phase-change latent heat of the phase-change materials in the embodiments and the comparative examples after 500 times of circulation.
The phase change materials obtained in the examples and comparative examples were tested with reference to the above test standards, and the test results are shown in the following table:
Figure BDA0003888593170000081
Figure BDA0003888593170000091
the results in the table show that the thermal conductivity coefficient of the phase-change material obtained in the embodiment can reach 0.69W/mK, and the thermal conductivity of the phase-change material is obviously improved compared with that of a pure sodium acetate solution (0.4W/mK). Meanwhile, the phase-change temperature of the phase-change material obtained in the embodiment is 54-60 ℃, the phase-change material is very suitable for a lithium ion battery thermal management system in consideration of the working temperature of the lithium ion battery, and meanwhile, the phase-change enthalpy value of the material can reach 252J/g, so that the phase-change material has high practical application value.
Compared with the embodiment 3, the graphene oxide is added into the organic silicon pouring sealant in the embodiment 4, and the heat conductivity coefficient and the phase change latent heat of the obtained phase change material are obviously higher than those of the embodiment 3, which shows that the addition of the graphene oxide in the organic silicon pouring sealant can effectively improve the heat conductivity and the heat storage performance of the phase change material.
Compared with the example 1, the mass percentage of the organic silicon pouring sealant in the comparative examples 1 to 3 is beyond the range defined by the invention, the thermal conductivity coefficient of the obtained phase change heat storage material is higher than that of the example 1, but the latent heat of phase change is far lower than that of the example 1; this shows that a phase change material with good heat conductivity and heat storage performance can be obtained only when the mass percentage of the organosilicon potting adhesive is kept within a certain range.
Application analysis:
the phase change material obtained in the embodiment is placed between the electric cores on a grouping production line by using a manipulator, or the phase change material is made into a battery thermal management assembly which is attached to the bottom of the lithium ion battery module, so that the temperature range of the lithium ion battery under the normal working condition is controlled. Therefore, when the phase change material obtained in the embodiment is applied to a battery thermal management system, compared with a phase change material-free phase change material, the maximum working temperature of the battery can be reduced from 60 ℃ to below 50 ℃, the maximum temperature difference is controlled to be below 2.0 ℃, the battery is kept in the optimal working temperature, the temperature consistency of the battery pack is ensured, and the working performance of the battery is well ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (10)

1. The phase change material for the lithium ion battery thermal management system is characterized by comprising the following components in percentage by mass: 85-92% of sodium acetate trihydrate, 3-5% of cellulose and 5-10% of organic silicon pouring sealant.
2. The phase change material for the lithium ion battery thermal management system according to claim 1, wherein the purity of the sodium acetate trihydrate is 99% or more.
3. The phase change material for the lithium ion battery thermal management system of claim 1, wherein the cellulose is at least one of carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, or hydroxypropyl methyl cellulose.
4. The phase change material for the lithium ion battery thermal management system according to any one of claims 1 to 3, wherein the silicone pouring sealant is an addition type two-component silicone pouring sealant; the organic silicon pouring sealant is obtained by adding graphene oxide into a conventional addition type bi-component organic silicon pouring sealant; the addition amount of the graphene oxide is 5-20wt% of the conventional addition type bi-component organic silicon pouring sealant.
5. The phase change material for the lithium ion battery thermal management system of claim 4, wherein the conventional addition type two-component silicone potting adhesive comprises components A and B;
the component A comprises the following components in parts by weight: 20-40 parts of vinyl silicone oil, 1-10 parts of dimethyl silicone oil, 1-20 parts of micro-nano heat-conducting filler and 0.1-2 parts of platinum catalyst; the component B comprises the following components in parts by weight: 20-50 parts of vinyl silicone oil, 5-20 parts of hydrogen-containing silicone oil, 1-20 parts of micro-nano heat-conducting filler and 0.1-1 part of methylbutynol.
6. A preparation method of a phase-change material for a lithium ion battery thermal management system is characterized by comprising the following steps: and adding sodium acetate trihydrate into the reaction container, sealing, heating and melting into liquid, sequentially adding cellulose and organic silicon pouring sealant, uniformly mixing, and curing and forming to obtain the phase-change material.
7. The method for preparing the phase-change material for the lithium ion battery thermal management system according to claim 6, wherein the heating and melting temperature is 70-90 ℃ and the time is 15-30min.
8. The preparation method of the phase change material for the lithium ion battery thermal management system according to claim 6 or 7, wherein the phase change temperature of the phase change material is 54-60 ℃, and the latent heat of phase change is more than 190J/g.
9. A lithium ion battery thermal management system, comprising the phase change material of any of claims 1-5.
10. The lithium ion battery thermal management system of claim 9, specifically comprising a battery thermal management component and a lithium ion battery module, wherein the battery thermal management component is composed of the phase change material and is attached to the lithium ion battery module.
CN202211252923.7A 2022-10-13 2022-10-13 Phase-change material for lithium ion battery thermal management system Pending CN115612460A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117410627A (en) * 2023-11-18 2024-01-16 武汉现代精工机械股份有限公司 Solid superconducting material for lithium battery and lithium battery thermal management system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117410627A (en) * 2023-11-18 2024-01-16 武汉现代精工机械股份有限公司 Solid superconducting material for lithium battery and lithium battery thermal management system

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