Energy storage cooling liquid as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of liquid cooling, and particularly relates to energy storage cooling liquid as well as a preparation method and application thereof. The energy storage cooling liquid is prepared by mixing a component A and a component B, the component A comprises base oil and organic lithium salt, and the component B comprises base oil and a temperature-sensitive phase change material; the component A and the component B comprise all the base oil, the organic lithium salt and the temperature-sensitive phase change material in parts by mass: 200 parts of the base oil; 3-5 parts of organic lithium salt; 1-3 parts of a temperature-sensitive phase change material; and complexing the organic lithium salt with the base oil. The energy storage cooling liquid provided by the invention can realize high heat transfer efficiency, and can provide more emergency treatment time in thermal management application to prevent thermal runaway.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid cooling, and particularly relates to a kind of energy storage cooling liquid and its preparation method and application. BACKGROUND

[0002] As a carrier of electric energy, the energy storage system can be used for grid peak shaving, effectively suppressing the volatility of large-scale new energy power generation connected to the power grid, improving the safety, economy and flexibility of power grid operation, and becoming the core and key of building smart grid and realizing renewable energy generation.

[0003] The thermal management of the energy storage system is an effective control means that can significantly improve the performance and safety of the energy storage system. Liquid cooling technology is a thermal management method that uses liquid medium circulation to cool the cooled equipment, has high cooling efficiency, and is suitable for high-power-density energy storage systems. The phase change thermal management technology (such as energy storage cooling liquid) in liquid cooling technology relies on the heat absorption or heat release characteristics of phase change materials during phase change, can cool or insulate the battery cells in the energy storage system, and has the characteristics of compact structure and low contact thermal resistance. However, the existing energy storage cooling liquid still has the problem of insufficient heat transfer efficiency, which needs to be improved. SUMMARY

[0004] The purpose of the present application is to solve the problem of insufficient heat transfer efficiency of energy storage cooling liquid, and to provide an energy storage cooling liquid and its preparation method and application, which can effectively improve the heat conduction effect of the energy storage cooling liquid, realize high heat transfer efficiency, and provide more emergency handling time in thermal management application to prevent thermal runaway.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows.

[0006] In the first aspect, the present application provides an energy storage cooling liquid, which is mixed by A component and B component; the A component includes base oil and organic lithium salt, and the B component includes base oil and temperature-sensitive phase change material;

[0007] The mass parts of all base oils in the A component and the B component, and the organic lithium salt and the temperature-sensitive phase change material are as follows:

[0008] The base oil is 200 parts;

[0009] The organic lithium salt is 3-5 parts;

[0010] The temperature-sensitive phase change material is 1-3 parts;

[0011] The organic lithium salt is complexed with the base oil.

[0012] The energy storage coolant is a functional fluid used in heat storage and thermal management systems, which can absorb, store and release heat energy in the process of phase change or sensible heat.

[0013] In the energy storage coolant, the organic lithium salt is complexed with the base oil. Understandably, since the mass fraction of the organic lithium salt is less, and the mass fraction of the base oil is significantly more than that of the organic lithium salt, the organic lithium salt is complexed with part of the base oil.

[0014] The energy storage coolant has a temperature-sensitive response performance by complexing the organic lithium salt with part of the base oil and compounding a certain proportion of the temperature-sensitive phase change material. On the one hand, the composition can maintain a flow state at this proportion, meeting the flow requirement of the coolant. On the other hand, the base oil molecule complexed with the organic lithium salt containing a polar group can improve the thermal conductivity of the overall structure, thereby facilitating the improvement of the heat transfer efficiency of the energy storage coolant; meanwhile, the temperature-sensitive phase change component can improve the overall specific heat capacity and absorb more heat, thereby further improving the heat transfer efficiency of the energy storage coolant.

[0015] In addition, when the temperature is too high, the temperature-sensitive phase change material can absorb heat through phase change to avoid further temperature rise, provide more emergency processing time, prevent thermal runaway, and make the energy storage coolant have good temperature control performance.

[0016] In some embodiments, the base oil contains a carbonyl group. Optionally, the base oil includes at least one of epoxidized soybean oil, linoleate, oleate, and palmitate.

[0017] These base oils all contain carbonyl groups, which can form complex structures with lithium ions in the organic lithium salt. Moreover, these base oils all have good biodegradability, environmental friendliness, and good chemical stability, which is conducive to maintaining the stability of the energy storage coolant.

[0018] In some embodiments, the organic lithium salt includes at least one of lithium bistrifluoromethanesulfonimide, lithium trifluoromethanesulfonate, lithium bisfluorosulfonimide, and lithium hexafluorophosphate.

[0019] The organic lithium salt has good compatibility with the base oil and can form a complex structure by complexation with the carbonyl group in the base oil.

[0020] In some embodiments, the temperature-sensitive phase change material includes at least one of a fatty acid solid-liquid phase change material and a wax-based solid-liquid phase change material, wherein the fatty acid solid-liquid phase change material includes hydrogenated castor oil acid, and the wax-based solid-liquid phase change material includes at least one of paraffin, beeswax, and microcrystalline wax. Optionally, the temperature-sensitive phase change material includes hydrogenated castor oil acid.

[0021] When the energy storage coolant is used for thermal management, the temperature-sensitive phase change materials can undergo solid-liquid phase change when the temperature changes, absorb or release latent heat, thereby regulating the temperature; and the temperature-sensitive phase change materials all have good biodegradability and excellent environmental protection.

[0022] In the case of selecting hydrogenated castor oil acid as the temperature-sensitive phase change material, the liquefaction temperature of the hydrogenated castor oil acid meets the use requirements of the energy storage coolant, and the hydrogenated castor oil acid has good lubricating performance, that is, even in a low-temperature solid phase, the energy storage coolant can still maintain good fluidity.

[0023] In some embodiments, the energy storage coolant comprises the following components by mass:

[0024] 200 parts of base oil;

[0025] 4 parts of organic lithium salt;

[0026] 2 parts of temperature-sensitive phase change material.

[0027] In some embodiments, the base oil is epoxy soybean oil, the organic lithium salt is lithium bistrifluoromethanesulfonimide, and the temperature-sensitive phase change material is hydrogenated castor oil acid.

[0028] In a second aspect, the present application provides a preparation method of an energy storage coolant, comprising:

[0029] providing component A containing organic lithium salt and part of base oil, and providing component B containing temperature-sensitive phase change material and the remaining base oil;

[0030] mixing component A and component B to obtain the energy storage coolant.

[0031] The temperature-sensitive phase change material and the organic lithium salt are usually solid substances, and the present application mixes the base oil, the organic lithium salt, and the temperature-sensitive phase change material in a certain order, which can avoid a sharp increase in the local concentration of substances, reduce uncontrollable side reactions, help maintain the flow state of the energy storage coolant, and effectively utilize the organic lithium salt and the temperature-sensitive phase change material to improve the heat transfer efficiency of the energy storage coolant.

[0032] In some embodiments, the preparation method of component A comprises: adding the organic lithium salt into part of the base oil, and stirring at 60-100℃ for 1-3h. The temperature can be any one point value or a range between any two point values of 60℃, 80℃, and 100℃, and the stirring time can be any one point value or a range between any two point values of 1h, 2h, and 3h.

[0033] By heating and stirring, the solid organic lithium salt can be fully dissolved in the base oil to form a clear solution, which is conducive to the subsequent uniform mixing with component B and avoids unnecessary side reactions; and part of the grafting can be completed during the heating and stirring process.

[0034] In some embodiments, the preparation method of the B component comprises: adding the temperature-sensitive phase change material into the remaining base oil, and stirring at 80-100℃ for 1-3h. The temperature can be any one of 80℃, 90℃, 100℃ or a range between any two of them, and the stirring time can be any one of 1h, 2h, 3h or a range between any two of them.

[0035] By heating and stirring, the solid temperature-sensitive phase change material can be fully dissolved in the base oil to form a clear solution, which is conducive to the subsequent uniform mixing with the A component and avoids unnecessary side reactions.

[0036] In some embodiments, the operation of mixing the A component with the B component comprises: stirring at 80-100℃ for 0.5-3h. The temperature can be any one of 80℃, 90℃, 100℃ or a range between any two of them, and the stirring time can be any one of 0.5h, 1h, 2h, 3h or a range between any two of them.

[0037] The organic lithium salt in the A component has high activity. By dissolving the organic lithium salt and the temperature-sensitive phase change material in the base oil respectively to form the A component and the B component, and then mixing the A component with the B component, the concentration of the organic lithium salt in the reaction system can be slowly increased controllably, and the excessive side reactions can be avoided. Moreover, under heating and stirring, the uniform distribution of the components and the complexation of the organic lithium salt and the base oil can be promoted.

[0038] In some embodiments, the base oil in the A component accounts for 20%-80% of the total mass of all base oils, and can be optionally 40%-60%, for example, any one of 20%, 40%, 50%, 60%, 80% or a range between any two of them.

[0039] The amount of the base oil in the A component and the B component can be flexibly adjusted, and it is generally necessary to ensure that the organic lithium salt and the temperature-sensitive phase change material can be fully dissolved.

[0040] The third aspect of the present application provides the application of the above-mentioned energy storage cooling liquid in the thermal management of energy storage systems.

[0041] An energy storage system is a technical device that stores energy in a certain form and releases it when needed. The energy storage cooling liquid of the present application can be used for thermal management of the energy storage system. The energy storage cooling liquid has high thermal conductivity and temperature-sensitive response performance, and can efficiently transfer heat during thermal management to regulate the temperature of the energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 Product photos of Comparative Examples 1-5;

[0043] Figure 2 Infrared spectra of raw materials and energy storage cooling fluid of Example 1, wherein curve a corresponds to the energy storage cooling fluid of Example 1, curve b corresponds to hydrogenated castor oil acid, curve c corresponds to lithium bistrifluoromethanesulfonimide, and curve d corresponds to epoxidized soybean oil.

[0044] Figure 3 DSC (differential scanning calorimetry) curve of the energy storage cooling fluid of Example 1, wherein the upward peak in the curve is an endothermic peak, and the downward peak is an exothermic peak. DETAILED DESCRIPTION

[0045] In order to better illustrate the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with specific examples.

[0046] The reagents, methods and equipment used in the present application are all conventional reagents, methods and equipment in the technical field, and can be obtained through commercial channels or prepared by known methods, unless otherwise specified. The "room temperature" or "ambient temperature" mentioned in the present application is 20-25°C, unless otherwise specified.

[0047] Example 1

[0048] Take 100.0 g of epoxidized soybean oil, and add 4.0 g of lithium bistrifluoromethanesulfonimide thereto. After stirring and dispersing, stir at 80°C under oil bath temperature control for 2 h until the solution is completely clear, and record as component A.

[0049] Take 100.0 g of epoxidized soybean oil, and add 2.0 g of hydrogenated castor oil acid thereto. After stirring and dispersing, stir at 100°C under oil bath temperature control for 2 h until the solution is completely clear, and record as component B.

[0050] Drop the clear component A into component B, and stir at 100°C under oil bath temperature control for 1 h until the solution is completely uniform. Then stop heating, and cool to room temperature under high-speed stirring to obtain an energy storage cooling fluid with temperature-sensitive responsiveness.

[0051] Example 2

[0052] The difference between this example and Example 1 is that the lithium bistrifluoromethanesulfonimide and the hydrogenated castor oil acid are adjusted to other suitable amounts.

[0053] Specifically, take 100.0 g of epoxidized soybean oil, and add 5.0 g of lithium bistrifluoromethanesulfonimide thereto. After stirring and dispersing, stir at 80°C under oil bath temperature control for 2 h until the solution is completely clear, and record as component A.

[0054] Take 100.0 g of epoxidized soybean oil, add 3.0 g of hydrogenated ricinoleic acid, stir and disperse it, and stir in an oil bath at 100° C. for 2 h until the solution is completely clear. This is recorded as component B.

[0055] The clarified component A was added dropwise to component B, and stirred in a 100°C oil bath for 1 hour until the solution was completely homogenized. Heating was then stopped, and the solution was cooled to room temperature under high-speed stirring to obtain a temperature-sensitive energy storage coolant.

[0056] Example 3

[0057] The difference between this embodiment and embodiment 1 is that the amounts of lithium bis(trifluoromethanesulfonyl)imide and hydrogenated ricinoleic acid are adjusted to other appropriate amounts.

[0058] Specifically, 100.0 g of epoxy soybean oil was taken, 3.0 g of lithium bis(trifluoromethanesulfonyl)imide was added thereto, and after being stirred and dispersed, the mixture was stirred in an 80° C. oil bath for 2 h until the solution was completely clear, which was recorded as component A.

[0059] Take 100.0 g of epoxidized soybean oil, add 1.0 g of hydrogenated ricinoleic acid, stir and disperse it, and stir in an oil bath at 100° C. for 2 h until the solution is completely clear. This is recorded as component B.

[0060] The clarified component A was added dropwise to component B, and stirred in a 100°C oil bath for 1 hour until the solution was completely homogenized. Heating was then stopped, and the solution was cooled to room temperature under high-speed stirring to obtain a temperature-sensitive energy storage coolant.

[0061] Example 4

[0062] The difference between this embodiment and embodiment 1 is that the epoxy soybean oil is replaced by palmitic acid ester.

[0063] Example 5

[0064] The difference between this embodiment and embodiment 1 is that lithium bistrifluoromethanesulfonyl imide is replaced by lithium trifluoromethanesulfonate.

[0065] Example 6

[0066] The difference between this embodiment and embodiment 1 is that hydrogenated ricinoleic acid is replaced by paraffin.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 1 is that the amount of hydrogenated ricinoleic acid is increased to 6.0 g.

[0069] Specifically, 100.0 g of epoxy soybean oil was taken, 4.0 g of lithium bis(trifluoromethanesulfonyl)imide was added thereto, and after being stirred and dispersed, the mixture was stirred in an 80° C. oil bath for 2 h until the solution was completely clear, which was recorded as component A.

[0070] Take 100.0 g of epoxy soybean oil, add 6.0 g of hydrogenated castor oil acid, stir and disperse until the solution is completely clear, and then stir at 100°C under oil bath control for 2h, until the solution is completely clear, record B component.

[0071] Take the clear A component and add it drop by drop to the B component, stir at 100°C under oil bath control for 1h, until the solution is completely uniform. Then stop heating, and cool to room temperature under high speed stirring.

[0072] Comparative Example 2

[0073] The difference between this comparative example and Example 1 is that the amount of hydrogenated castor oil acid is increased to 8.0 g.

[0074] Specifically, take 100.0 g of epoxy soybean oil, add 4.0 g of lithium bis-trifluoromethanesulfonimide, stir and disperse until the solution is completely clear, and then stir at 80°C under oil bath control for 2h, until the solution is completely clear, record A component.

[0075] Take 100.0 g of epoxy soybean oil, add 8.0 g of hydrogenated castor oil acid, stir and disperse until the solution is completely clear, and then stir at 100°C under oil bath control for 2h, until the solution is completely clear, record B component. Take the clear A component and add it drop by drop to the B component, stir at 100°C under oil bath control for 1h, until the solution is completely uniform. Then stop heating, and cool to room temperature under high speed stirring.

[0076] Comparative Example 3

[0077] The difference between this comparative example and Example 2 is that the amount of lithium bis-trifluoromethanesulfonimide is reduced to 2.0 g, and the amount of hydrogenated castor oil is increased to 6.0 g.

[0078] Specifically, take 100.0 g of epoxy soybean oil, add 2.0 g of lithium bis-trifluoromethanesulfonimide, stir and disperse until the solution is completely clear, and then stir at 80°C under oil bath control for 2h, until the solution is completely clear, record A component.

[0079] Take 100.0 g of epoxy soybean oil, add 6.0 g of hydrogenated castor oil acid, stir and disperse until the solution is completely clear, and then stir at 100°C under oil bath control for 2h, until the solution is completely clear, record B component.

[0080] Take the clear A component and add it drop by drop to the B component, stir at 100°C under oil bath control for 1h, until the solution is completely uniform. Then stop heating, and cool to room temperature under high speed stirring.

[0081] Comparative Example 4

[0082] The difference between this comparative example and Example 1 is that the amount of lithium bistrifluoromethanesulfonimide is increased to 6.0 g, and the amount of hydrogenated castor oil is also increased to 6.0 g.

[0083] Specifically, 100.0 g of epoxidized soybean oil is taken, 6.0 g of lithium bistrifluoromethanesulfonimide is added thereto, and after stirring and dispersing, stirring is performed at 80°C under oil bath temperature control for 2 h until the solution is completely clear, and this is recorded as component A.

[0084] 100.0 g of epoxidized soybean oil is taken, 6.0 g of hydrogenated castor oil acid is added thereto, and after stirring and dispersing, stirring is performed at 100°C under oil bath temperature control for 2 h until the solution is completely clear, and this is recorded as component B.

[0085] The clear component A is added dropwise to component B, stirring is performed at 100°C under oil bath temperature control for 1 h until the solution is completely uniform. Then heating is stopped, and cooling is performed to room temperature under high-speed stirring.

[0086] Comparative Example 5

[0087] The difference between this comparative example and Example 1 is that lithium bistrifluoromethanesulfonimide is added together with hydrogenated castor oil acid to epoxidized soybean oil.

[0088] Specifically, 200.0 g of epoxidized soybean oil is taken, 4.0 g of lithium bistrifluoromethanesulfonimide is added thereto, and after stirring and dispersing, stirring is performed at 80°C under oil bath temperature control for 2 h until the solution is completely clear. Then 2.0 g of hydrogenated castor oil acid is added, and after stirring and dispersing, stirring is performed at 100°C under oil bath temperature control for 2 h.

[0089] Comparative Example 6

[0090] The difference between this comparative example and Example 1 is that hydrogenated castor oil acid is not added.

[0091] Specifically, 200.0 g of epoxidized soybean oil is taken, 4.0 g of lithium bistrifluoromethanesulfonimide is added thereto, and after stirring and dispersing, stirring is performed at 100°C under oil bath temperature control for 2 h until the solution is completely clear.

[0092] Comparative Example 7

[0093] The difference between this comparative example and Example 1 is that lithium bistrifluoromethanesulfonimide is not added.

[0094] Specifically, 200.0 g of epoxidized soybean oil is taken, 2.0 g of hydrogenated castor oil acid is added thereto, and after stirring and dispersing, stirring is performed at 100°C under oil bath temperature control for 2 h until the solution is completely clear.

[0095] Comparative Example 8

[0096] The difference between this comparative example and Example 1 is that lithium bistrifluoromethanesulfonimide is replaced by lithium hydroxide.

[0097] blank control group

[0098] The epoxy soybean oil without lithium bistrifluoromethanesulfonimide and hydrogenated castor oil acid was used as a blank control group.

[0099] Specifically, 200.0 g of the epoxy soybean oil was stirred at 100 °C for 2 h, then the heating was stopped and the oil was cooled to room temperature under high-speed stirring to obtain a transparent oil liquid.

[0100] The components and their amounts in each example and comparative example are shown in Table 1 below.

[0101] [Table 1]

[0102]

[0103]

[0104] The morphology and performance of the products obtained in each example and each comparative example and the blank control group were observed or tested, and the results are as follows:

[0105] 1. Flowability

[0106] Compared with the pure epoxy soybean oil (blank control group), the products obtained in Examples 1-6 still had good flowability. The products obtained in Comparative Examples 1-4 were viscous gels and had no flowability; in Comparative Example 5, since lithium bistrifluoromethanesulfonimide and hydrogenated castor oil acid were directly added, the reaction was very uneven, and the product not only lost flowability, but also had dark clumps in some parts, as shown in FIG. 1. This shows that the epoxy soybean oil, lithium bistrifluoromethanesulfonimide and hydrogenated castor oil acid are compounded according to the scheme of Examples 1-6, and the obtained product can maintain good flowability and can be used as an energy storage coolant. Figure 1

[0107] 2. Infrared spectrum test

[0108] The infrared spectra of the raw materials and the energy storage coolant in Example 1 were determined by a Bruker Tensor 27 Fourier infrared spectrometer, and the results are shown in FIG. 2. In the infrared spectrum analysis process, the stretching vibration peak of C=O bond in ethyl caprate (1738 cm-1) was used as the carbonyl peak comparison standard. -1 Figure 2

[0109] Figure 2 In FIG. 2, curve a is the infrared spectrum curve of the energy storage coolant obtained in Example 1, curve b is the infrared spectrum curve of hydrogenated castor oil acid, curve c is the infrared spectrum curve of lithium bistrifluoromethanesulfonimide, and curve d is the infrared spectrum curve of the epoxy soybean oil.

[0110] ​​​When the three raw materials were mixed and reacted, two absorption peaks not belonging to the three raw materials appeared in the infrared spectrum of the obtained energy storage coolant, at 1744 cm -1 and 1464 cm -1 (see curve a in Figure 2 ). Among them, 1744 cm -1 moved to a higher wave number compared with 1738 cm -1 , which was due to the presence of lithium bis-trifluoromethanesulfonimide, which caused the vibration peak of the C=O bond of the epoxy soybean oil to move to a higher wave number. That is, Li + formed a conjugation with the carbonyl oxygen, and the C=O bond was affected by the electron-withdrawing effect of Li + , so that the electron cloud density near it decreased and moved to a higher wave number. This conjugation reflects a kind of complexation, that is, the C=O bond in the epoxy soybean oil forms a complex containing C=O-Li structure with lithium bis-trifluoromethanesulfonimide. At the same time, the presence of the C=O-Li structure caused the C=O to shift from 1750 cm -1 in curve d to 1744 cm -1 in curve a, that is, 1744 cm -1 reflects the stretching vibration of C=O-Li. This result shows that the epoxy soybean oil, lithium bis-trifluoromethanesulfonimide and hydrogenated castor oil acid in Example 1 are not simply mixed, but new substances generated by chemical reaction. At the same time Figure 1 , the product shown in the figure loses fluidity, which is also the result of chemical reaction between the raw materials.

[0111] Understandably, since the main component of the energy storage coolant is epoxy soybean oil, and the contents of hydrogenated castor oil acid and lithium bis-trifluoromethanesulfonimide are very low, curve a mainly reflects the characteristic peaks of epoxy soybean oil, and does not reflect the relevant characteristic peaks of hydrogenated castor oil acid and lithium bis-trifluoromethanesulfonimide.

[0112] 3. Thermal conductivity test

[0113] At room temperature, the thermal conductivities of the products prepared in Examples 1-6, Comparative Examples 6-8, the blank control group and a commercially available sample were tested by a TC3000E thermal conductivity tester. The commercially available sample was Shell E-Coolant 3000, which is a glycol-based modified coolant oil liquid added with thermal conductive fillers. During the test, each sample was tested 3 times (three results were obtained, i.e. thermal conductivity 1, thermal conductivity 2 and thermal conductivity 3), and the average value was finally taken, as shown in Table 2.

[0114] [Table 2]

[0115]

[0116] The test results reflect that the thermal conductivity of the energy storage coolant of Examples 1-6 is improved compared with the pure epoxy soybean oil (blank control group) and the commercially available sample. The thermal conductivity of Example 1 is 0.186 W / m.K, which is increased by 20.8% compared with the blank control group and 26.5% compared with the commercially available sample. It can be seen that the energy storage coolants of Examples 1-6 have excellent thermal conductivity, so that more heat is transferred under the same conditions in actual use, achieving a more excellent cooling effect.

[0117] Although the products of Comparative Examples 6-8 can maintain a flow state, the thermal conductivities of Comparative Examples 7-8 do not improve compared with the blank control group. Although Comparative Example 6 has a high thermal conductivity, it fails to exhibit temperature-sensitive response performance in the temperature-sensitive response test.

[0118] 4. Temperature-sensitive response test

[0119] The NETZSCH DSC 204HP German Netzsch high-pressure differential scanning calorimeter was used to test the heat change of the energy storage coolant of Example 1 in the heating and cooling process, and the results are shown in Figure 3 .

[0120] In the heating process, the product of Example 1 has an obvious endothermic peak at 22.8°C, which is the endothermic phase change process of hydrogenated castor oil acid in the energy storage coolant. In the cooling process, the exothermic peak appears at 37.8°C, and when the temperature of the heat dissipation system is lower than this value, the hydrogenated castor oil acid can be converted by exothermic to perform the next endothermic process. At the same time, the phase change displacement appears at 52.8°C in Figure 3 , before this temperature, the energy storage coolant has endothermic performance, and when the temperature is too high, the temperature-sensitive phase change component can still further absorb heat, providing more emergency handling time and preventing the occurrence of thermal runaway.

[0121] It can be seen that the energy storage coolant of Example 1 has excellent temperature-sensitive response performance, so that more heat can be absorbed under the same conditions in actual use, and the temperature rise of the energy storage coolant itself is smaller, achieving a more excellent cooling effect.

[0122] The same method was used to test other products, and the results showed that the products of Examples 2-6 also exhibited similar temperature-sensitive response phenomena as Example 1, while the product of Comparative Example 6 failed to exhibit temperature-sensitive response performance, which would lead to the occurrence of thermal runaway in application.

[0123] Finally, it should be noted that the above examples are merely intended to illustrate the technical solutions of the present application and not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present application.

Claims

1. An energy storage coolant, characterized in that: It is formed by mixing component A and component B; the component A includes base oil and organic lithium salt, and the component B includes base oil and temperature-sensitive phase change material; The mass parts of all the base oils in the A component and the B component, as well as the organic lithium salt and the temperature-sensitive phase change material are as follows: 200 parts of the base oil; 3 to 5 parts of the organic lithium salt; 1 to 3 parts of the temperature-sensitive phase change material; The organic lithium salt is complexed with the base oil.

2. The energy storage coolant according to claim 1, characterized in that: The base oil contains a carbonyl group; and / or the base oil includes at least one of epoxidized soybean oil, linoleic acid ester, oleic acid ester, and palmitic acid ester.

3. The energy storage coolant according to claim 1 or 2, characterized in that: The organic lithium salt includes at least one of lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium bis(fluorosulfonyl)imide, and lithium hexafluorophosphate; and / or the temperature-sensitive phase change material includes at least one of fatty acid solid-liquid phase change material and wax-based solid-liquid phase change material.

4. The energy storage coolant according to claim 3, characterized in that: The fatty acid solid-liquid phase change material includes hydrogenated ricinoleic acid, and the wax-based solid-liquid phase change material includes at least one of paraffin wax, beeswax, and microcrystalline wax.

5. A method for preparing the energy storage coolant according to any one of claims 1 to 4, characterized in that: include: Providing a component A comprising the organic lithium salt and a portion of the base oil, and providing a component B comprising the temperature-sensitive phase change material and the remaining base oil; The component A is mixed with the component B to obtain the energy storage coolant.

6. The method for preparing the energy storage coolant according to claim 5, characterized in that: The preparation method of the component A comprises: adding the organic lithium salt to a portion of the base oil, and stirring at 60-100° C. for 1-3 hours.

7. The method for preparing the energy storage coolant according to claim 5 or 6, characterized in that: The preparation method of the B component comprises: adding the temperature-sensitive phase change material to the remaining base oil, and stirring at 80-100° C. for 1-3 hours.

8. The method for preparing the energy storage coolant according to claim 5 or 6, characterized in that: The operation of mixing the component A with the component B includes stirring at 80-100° C. for 0.5-3 hours.

9. The method for preparing the energy storage coolant according to claim 5, characterized in that: The base oil in the A component accounts for 20% to 80% of the total mass of all the base oils.

10. Use of the energy storage coolant according to any one of claims 1 to 4 in thermal management of an energy storage system.

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