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Composite phase change material for thermal batteries and method for preparing composite phase change material

A technology of composite phase change materials and thermal batteries, which is applied in the field of composite phase change materials for thermal batteries and its preparation, can solve problems such as difficulty in ensuring safety during working hours, and achieve rapid response to heat changes, improve capillary adsorption effects, The effect of preventing leakage

Active Publication Date: 2019-01-04
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a composite phase change material for thermal battery and its preparation method to solve the problem in the prior art that it is difficult to ensure safety when adding more heating materials to prolong the working time

Method used

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  • Composite phase change material for thermal batteries and method for preparing composite phase change material

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Experimental program
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Embodiment 1

[0016] Embodiment 1: a kind of preparation method of thermal battery composite phase change material, comprises the following steps:

[0017] Step 1. Mixing: Melt 159.6 parts of LiF, 332.5 parts of Li2SO4, and 172.9 parts of LiCl into a liquid state at 600 ° C. After cooling and solidifying, pulverize to obtain a pulverized product, and then add 35 parts of foamed graphite to the pulverized product. 400r / min~1200r / min high-energy ball mill to get the mixture after mixing evenly;

[0018] Step 2, immersion: the mixture is evenly distributed on 300 parts of porous MgO, and then placed in a high temperature environment of 600° C. for 2 to 4 hours, and the composite phase change material can be obtained after cooling.

[0019] The specific heat capacity before melting of the composite phase change material is 0.63J / g, the phase change temperature range is 470.3°C-493.2°C, and the latent heat of phase change is 277.4J / g. One of them is 1g. Take 14g of composite phase change materi...

Embodiment 2

[0020] Embodiment 2: a kind of preparation method of thermal battery composite phase change material, comprises the following steps:

[0021] Step 1. Mixing: Melt 159.6 parts of LiF and 505.4 parts of LiCl into a liquid state at 650°C, cool and solidify, and then pulverize to obtain a pulverized product, then add 35 parts of foamed graphite to the pulverized product at a speed of 400r / min~1200r / min of the high-energy ball mill to obtain the mixture;

[0022] Step 2, immersion: the mixture is evenly distributed on 300 parts of porous MgO, and then placed in a high temperature environment of 650° C. for 2 to 4 hours, and the composite phase change material can be obtained after cooling.

[0023] The specific heat capacity before melting of the composite phase change material is 0.72J / g, the phase change temperature range is 527.3°C-543.2°C, and the latent heat of phase change is 462.4J / g. One of them is 10g, such as figure 1 As shown, take 14g of composite phase-change materi...

Embodiment 3

[0024] Embodiment 3: a kind of preparation method of thermal battery composite phase-change material, comprises the following steps:

[0025] Step 1. Mixing: Melt 151.2 parts of LiF and 478.8 parts of LiCl into a liquid state at 650°C, cool and solidify, and then pulverize to obtain a pulverized product, then add 70 parts of foamed graphite to the pulverized product, at a speed of 400r / min~1200r / min of the high-energy ball mill to obtain the mixture;

[0026] Step 2, immersion: the mixture is evenly distributed on 300 parts of porous MgO, and then placed in a high temperature environment of 650° C. for 2 to 4 hours, and the composite phase change material can be obtained after cooling.

[0027] The specific heat capacity before melting of the composite phase change material is 0.72J / g, the phase change temperature range is 527.3°C-543.2°C, and the latent heat of phase change is 389.1J / g. One of them is 1g. Take 14g of composite phase change material and press it into a sheet...

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Abstract

The invention discloses a composite phase change material for thermal batteries, and belongs to the technical field of thermal batteries. The composite phase change material comprises, by weight, 30%-90% of phase change molten salt, 0.1%-20% of carbon materials and 5%-70% of carriers with the porosity reaching 30%-99%. According to the scheme, the composite phase change material has the advantagethat the internal temperatures of the thermal batteries can be actively adjusted by the composite phase change material.

Description

technical field [0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a composite phase-change material for thermal batteries and a preparation method thereof. Background technique [0002] Thermal battery is a one-time reserve power source developed at the end of World War II, and has been widely used in high-tech weapons such as cruise missiles, anti-missile missiles, nuclear weapons, artillery, and mines. The thermal battery mainly uses molten salt as the electrolyte, and relies on electrical activation or mechanical activation to ignite the internal pyrotechnic source. After activation, the battery heating system will make the solid molten salt reach the working temperature (that is, the temperature when the electrolyte crystal changes from solid to liquid) , so that the positive and negative electrodes generate a working current and voltage through the electrolyte reaction. Since the conductivity of the molten salt electr...

Claims

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Application Information

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IPC IPC(8): C09K5/06H01M6/50
CPCC09K5/063H01M6/5038
Inventor 郭灏唐立成王建勇石斌陈铤李云伟
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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