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Preparation method for phase-change heat storage capsule used for thermal adjusting of power lithium battery

A phase change heat storage and lithium battery technology, which is applied in microcapsule preparations, microsphere preparation, heat exchange materials, etc., can solve the problems of liquid molten salt being easily lost, leaking, corrosive, unsuitable for phase change energy storage materials, etc.

Active Publication Date: 2019-05-31
HUBEI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting points of these materials are all over 65°C, so they are not suitable as phase change energy storage materials for thermal regulation of lithium batteries.
In addition, when the above two mixed molten salt phase change energy storage materials undergo a solid-liquid phase transition during the heat absorption process, the liquid molten salt is easy to leak and has a certain degree of corrosion.

Method used

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  • Preparation method for phase-change heat storage capsule used for thermal adjusting of power lithium battery
  • Preparation method for phase-change heat storage capsule used for thermal adjusting of power lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0016] 20~35wt% lithium nitrate, 1.5~5wt% sodium nitrate, 2.5~10wt% potassium nitrate, 2~10wt% calcium nitrate, 5~15wt% sodium nitrite, 15~35wt% sodium chloride, 1~6wt% carbonic acid Potassium and 1-8wt% potassium sulfate are mixed and ground into fine powder, dried at 150°C for 10 hours, mixed according to a certain mass fraction ratio to obtain a mixed salt (melting point is 50-55°C), heated and melted at 200°C for 10 hours, Take it out and put it in a desiccator to cool, then grind it into a fine powder, and sieve it with a 120-mesh sieve;

[0017] Put 4 grams of sieved mixed molten salt fine powder and 15 milliliters of n-butyl ether in a round-bottomed flask, and after 30 minutes of ultrasonic dispersion, add 3 grams of n-butyl ether of perhydropolysilazane (PHPS) Solution (mass fraction is 30%), adopt magnetic stirring to mix evenly, then add 150 grams of n-dodecane and stir and extract for 15 minutes, let stand for 30 minutes, remove the mixed solution of n-butyl ether ...

Embodiment 2

[0019] 20~35wt% anhydrous lithium nitrate, 1.5~5wt% sodium nitrate, 2.5~10wt% potassium nitrate, 2~10wt% anhydrous calcium nitrate, 5~15wt% sodium nitrite, 15~35wt% sodium chloride, 1 ~6wt% potassium carbonate and 1~8wt% potassium sulfate are mixed and ground into fine powder, dried at 150°C for 10 hours, mixed according to a certain mass fraction ratio to obtain mixed salt (melting point is 50~55°C), heated at 200°C Melt for 10 hours, take it out and put it in a desiccator to cool, then grind it into a fine powder, and sieve it with a 120-mesh sieve;

[0020] Put 4 grams of sieved mixed molten salt fine powder and 15 milliliters of n-butyl ether in a round-bottomed flask, and after 30 minutes of ultrasonic dispersion, add 3 grams of n-butyl ether of perhydropolysilazane (PHPS) Solution (mass fraction is 30%), adopt magnetic stirring to mix evenly, then add 150 grams of n-dodecane and stir and extract for 15 minutes, let stand for 30 minutes, remove the mixed solution of n-but...

Embodiment 3

[0022] 35~63wt% lithium nitrate trihydrate, 1.5~5wt% sodium nitrate, 2.5~10wt% potassium nitrate, 2.5~15wt% calcium nitrate tetrahydrate, 5~15wt% sodium nitrite, 15~35wt% sodium chloride, 1 ~6wt% potassium carbonate and 1~8wt% potassium sulfate are mixed and ground into fine powder, dried at 150°C for 10 hours, mixed according to a certain mass fraction ratio to obtain mixed salt (melting point is 50~55°C), heated at 200°C Melt for 10 hours, take it out and put it in a desiccator to cool, then grind it into a fine powder, and sieve it with a 120-mesh sieve;

[0023] Put 4 grams of sieved mixed molten salt fine powder and 15 milliliters of n-butyl ether in a round-bottomed flask, and after 30 minutes of ultrasonic dispersion, add 3 grams of n-butyl ether of perhydropolysilazane (PHPS) Solution (mass fraction is 30%), adopt magnetic stirring to mix evenly, then add 150 grams of n-dodecane and stir and extract for 15 minutes, let stand for 30 minutes, remove the mixed solution of...

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Abstract

The invention provides a preparation method for a phase-change heat storage capsule used for thermal adjusting of a power lithium battery, and belongs to the technical field of power batteries. Mixedsalt comprising 20-35wt% of lithium nitrate, 1.5-5wt% of sodium nitrate, 2.5-10wt% of potassium nitrate, 2-10wt% of calcium nitrate, 5-15wt% of sodium nitrite, 15-35wt% of sodium chloride, 1-6wt% of potassium carbonate and 1-8wt% of potassium sulphate is ground into fine powder, and after sieving adopting a 120-mesh sieve, fine fused salt powder with the uniform particle size is formed; 4 grams ofthe fine fused salt powder after sieving and a butyl ether solution (the mass fraction is 30%) of 3 grams of perhydropolysilazane (PHPS) are placed in a round-bottom flask for uniform mixing, 150 grams of n-dodecane is added, the mixture is stirred for 10 minutes, and then standing is conducted for 30 minutes. The preparation method has the advantages that the phase-change temperature is 50-55 DEG C, and the cost is lower.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and relates to a preparation method of a phase-change heat storage capsule used for thermal regulation of a power lithium battery. Background technique [0002] In recent years, the new energy electric vehicle market at home and abroad has developed rapidly, and its power source is mainly lithium batteries. The comprehensive electrochemical performance of lithium-ion battery is excellent, and the specific energy density is as high as 250WhKg -1 , and in continuous improvement, while manufacturing costs continue to decline, has great prospects for development. However, lithium-ion batteries also have their shortcomings. During their frequent charging and discharging, they tend to generate heat and heat up. If the heat and temperature cannot be controlled in time, it will easily lead to thermal runaway and cause the battery to short-circuit, catch fire or even explode, such as: Tesla Ther...

Claims

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Application Information

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IPC IPC(8): B01J13/02C09K5/06
Inventor 王军涛
Owner HUBEI UNIV OF SCI & TECH
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