Hydrated salt thermal chemical heat storage composite material as well as preparation method and application thereof

A technology of composite materials and heat storage materials, applied in the field of thermochemical heat storage model and its establishment process, hydrated salt thermochemical heat storage composite materials and its preparation, can solve the problems of difficult heating rate, large battery heat release, and material heating speed Fast and other problems, to curb the spread of thermal runaway, alleviate the thermal runaway of the battery, and achieve the effect of good thermal conductivity

Pending Publication Date: 2022-05-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common hydrated salt thermochemical heat storage models are kinetic models, and the modeling methods are to test the thermal decomposition of materials at different temperature rise rates (such as 5K / min, 10K / min, 15K / min, etc.), and then The activation energy, pre-exponential factor and other parameters are calculated by the Arrhenius formula, and the obtained model parameters are extremely dependent on the material test conditions, and the calculation is cumbersome
In addition, when the battery is thermally out of control, the amount of heat released is huge, and the heating rate of the material is relatively fast. It is difficult to match the test heating rate with the actual application scenario. The obtained thermochemical heat storage model may not be applicable to the actual situation where the material is rapidly heated and decomposed.

Method used

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  • Hydrated salt thermal chemical heat storage composite material as well as preparation method and application thereof
  • Hydrated salt thermal chemical heat storage composite material as well as preparation method and application thereof
  • Hydrated salt thermal chemical heat storage composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) 100 mesh expanded graphite is selected, and the expanded graphite is placed in a 120 ℃ oven for 24 hours to remove the moisture in the adsorbed air. The expanded graphite and Tween 60 are mixed in a sealed stirred tank according to the mass ratio of 96:4, and stirred at 60 ° C for 3 hours. The Tween 60 needs to be dissolved in pure water first, and the aqueous solution of Tween 60 must be completely moistened. Wet expanded graphite. Then, the modified expanded graphite was dried in an oven at 120 °C for 24 h to remove the modifier, thereby obtaining hydrophilic modified expanded graphite.

[0040] (2) Blend disodium hydrogen phosphate dodecahydrate and sodium acetate trihydrate in a mass ratio of 97:3, and melt them completely in an oven at 65°C; dry the alumina fibers cut into small sections in an oven at 120°C for 24 hours .

[0041] (3) Mix the hydrophilic modified expanded graphite, blended salt, and alumina fiber in a sealed stirring tank in a ratio of 20:70:...

Embodiment 2

[0044] (1) Select 50 mesh expanded graphite, and place the expanded graphite in a 100 ℃ oven for 48 hours to remove moisture from the adsorbed air. The expanded graphite and octyl phenyl polyoxyethylene ether were mixed in a sealed stirred tank according to the mass ratio of 96:4, and stirred at 65 ° C for 2 hours, wherein octyl phenyl polyoxyethylene ether should be dissolved in pure water first. , and ensure that the aqueous solution of octylphenyl polyoxyethylene ether completely wets the expanded graphite. Then, the modified expanded graphite was dried in an oven at 110 °C for 36 h to remove the modifier, thereby obtaining hydrophilic modified expanded graphite.

[0045] (2) blend disodium hydrogen phosphate dodecahydrate and sodium acetate trihydrate in a mass ratio of 90:10, and melt completely in a 70°C oven; the aluminum nitride fibers cut into small sections are dried in a 110°C oven 36h.

[0046] (3) Mix the hydrophilic modified expanded graphite, blended salt, and...

Embodiment 3

[0049] (1) Select silicon carbide powder, and place the silicon carbide powder in a 110°C oven for 36 hours to remove the absorbed moisture in the air. Mix silicon carbide and Tween 60 in a sealed stirred tank in a mass ratio of 96:4, and stir at 70 ° C for 1 hour, wherein Tween 60 needs to be dissolved in pure water first, and ensure that the aqueous solution of Tween 60 is completely moistened. Wet silicon carbide powder. Then, the modified silicon carbide was dried in an oven at 100 °C for 48 h to remove the modifier, thereby obtaining hydrophilic modified silicon carbide.

[0050] (2) Blend disodium hydrogen phosphate dodecahydrate and sodium acetate trihydrate in a mass ratio of 98:2, and melt them completely in a 60°C oven; dry the alumina fibers cut into small sections for 48h in a 100°C oven .

[0051] (3) Mix the hydrophilic modified silicon carbide, blended salt, and alumina fiber in a sealed stirring tank in a ratio of 15:80:5, and seal and stir at 60 °C for 6 hou...

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Abstract

The invention discloses a hydrated salt thermal chemical heat storage composite material as well as a preparation method and application thereof. The hydrated salt thermochemical energy storage composite material with excellent thermochemical heat storage performance, good heat conduction performance and compression resistance is obtained by compounding hydrated salt, a high-heat-conduction material and a reinforcing material. The composite material can be filled in a battery module, and when the battery is subjected to thermal runaway due to electric abuse, mechanical abuse and thermal abuse, the thermal runaway of the battery can be relieved and the thermal runaway of the battery can be prevented from spreading. Besides, the invention provides a thermochemical heat storage principle which can be used for battery thermal runaway protection, and a simple model for describing a material thermochemical heat storage process is constructed, so that the temperature of the battery can be quickly and reasonably estimated, and the use amount of a composite material in a module can be optimized.

Description

technical field [0001] The invention relates to the field of thermochemical heat storage and the field of battery thermal runaway, and relates to a hydrated salt thermochemical heat storage composite material and a preparation method and application thereof. The application relates to a thermochemical heat storage model and its establishment process. Background technique [0002] With the large-scale application of lithium-ion batteries and the continuous improvement of lithium-ion battery capacity, lithium-ion battery accidents continue to occur frequently, such as electric vehicle battery pack damage and fire, energy storage power station battery module fire, etc. When the lithium-ion battery is subjected to thermal abuse, electrical abuse, and mechanical abuse, the internal substances continue to decompose to generate heat, which makes the battery temperature continue to rise, causing thermal runaway and the spread of thermal runaway. Some literatures point out that the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06H01M10/613H01M10/659
CPCC09K5/063H01M10/613H01M10/659Y02E60/14
Inventor 张正国林绍凌子夜方晓明
Owner SOUTH CHINA UNIV OF TECH
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