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Hydrated salt phase change energy storage material and preparation method thereof, and battery thermal management system

A phase change energy storage material, hydrated salt technology, applied in secondary batteries, heat exchange materials, chemical instruments and methods, etc. Out of control and other problems, to achieve the effect of battery thermal runaway protection, improve performance and life, and improve safety

Pending Publication Date: 2019-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic phase change materials are expensive, and there are problems of economic benefits in practical applications.
More importantly, the above-mentioned organic phase change materials have a single temperature control section, and the application in the thermal runaway stage of the battery requires the assistance of other thermal management methods, and there is a risk of flammability
In the existing research on the battery thermal management system of phase change materials, organic phase change materials such as higher aliphatic hydrocarbons, higher aliphatic alcohols, and alkane-type paraffins cannot simultaneously solve the problems of battery performance degradation in the middle temperature range and thermal runaway in the high temperature range.

Method used

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  • Hydrated salt phase change energy storage material and preparation method thereof, and battery thermal management system
  • Hydrated salt phase change energy storage material and preparation method thereof, and battery thermal management system
  • Hydrated salt phase change energy storage material and preparation method thereof, and battery thermal management system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 2 Said, a preparation method of a hydrated salt phase change energy storage material, comprising the steps of:

[0037] Mix sodium acetate trihydrate and urea at a mass ratio of 91:9, heat to 70°C to melt, stir evenly with a magnetic force, add sodium hydroxymethyl cellulose with a mass percentage of 0.5%, stir magnetically until homogeneous, and then add Graphite powder with a mass percentage of 2.5% was magnetically stirred to obtain a homogeneous mixture. The mixture is mixed and adsorbed with 50 mesh expanded graphite in a mass ratio of 80:20, and continuously mechanically stirred until the mixture is completely absorbed in the expanded graphite, sealed and cooled at room temperature to solidify, and the mass fraction is 80% acetic acid trihydrate Sodium-urea / expanded graphite composite phase change energy storage material.

[0038] image 3 It is the DSC curve of the composite phase change energy storage material obtained in Example 1. The phase...

Embodiment 2

[0042] A preparation method of a hydrated salt phase change energy storage material, comprising the steps of:

[0043] Heat 99.0% by mass sodium acetate trihydrate to 70°C to melt, add 1.0% by mass sodium hydroxymethyl cellulose, and magnetically stir until homogeneous. The homogeneous mixture is mixed and adsorbed with 50 mesh expanded graphite at a mass ratio of 72.5: 27.5, and continuously mechanically stirred until the mixture is completely absorbed into the expanded graphite, then adding graphite powder with a mass percentage of 1.0% and mixing evenly, at room temperature After cooling and solidification, a sodium acetate trihydrate / expanded graphite composite phase change energy storage material with a mass fraction of 72.5% was obtained.

[0044] The hydrated salt composite phase change energy storage material obtained in this example has a phase transition temperature of 58.3 °C, a phase transition enthalpy of 181.0 J / g, a thermal decomposition temperature of 114.1 °C, a...

Embodiment 3

[0046] A preparation method of a hydrated salt phase change energy storage material, comprising the steps of:

[0047] Mix sodium acetate trihydrate and urea with a mass ratio of 9:1, heat to 70 ° C to melt, stir evenly with a magnetic force, add sodium hydroxymethyl cellulose with a mass percentage of 1.0%, stir magnetically until homogeneous, and then add The mass percent is 2.0% graphite powder, magnetically stirred to obtain a homogeneous mixture. The mixture is mixed and adsorbed with 50 mesh expanded graphite in a mass ratio of 75:25, and continuously mechanically stirred until the mixture is completely absorbed into the expanded graphite, sealed and cooled at room temperature to solidify to obtain acetic acid trihydrate with a mass fraction of 75%. Sodium-urea / expanded graphite composite phase change energy storage material.

[0048] The hydrated salt composite phase change energy storage material obtained in this example has a phase transition temperature of 30-55°C, ...

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Abstract

The invention discloses a hydrated salt phase change energy storage material and a preparation method thereof, and a battery thermal management system. The energy storage material is prepared from thefollowing raw materials: 40-90% of hydrated salt, 0-15% of a temperature regulator, 1-5% of a nucleating agent, 0-2% of a thickening agent and 9-38% of a porous adsorption matrix. The preparation method comprises the steps: (1) uniformly mixing the temperature regulator with hydrated salt to obtain a mixture; (2) heating to melt the mixture; (3) uniformly stirring the mixture obtained in the step(2) to obtain a molten mixture; (4) adding a thickening agent and a nucleating agent into the molten mixture, and continuously stirring to a homogeneous phase; (5) adding the homogeneous mixture obtained in the step (4) into a porous adsorption matrix, and continuously stirring until the mixture is completely adsorbed into the porous matrix; and (6) cooling and solidifying. The hydrated salt phase change energy storage material has double-temperature-section temperature control capability, realizes temperature regulation and control of a battery pack in a full-temperature-range range, improves the use performance of the battery pack, prolongs the service life of the battery pack, and improves the safety of the battery pack.

Description

technical field [0001] The invention relates to the technical field of battery thermal management, in particular to a hydrated salt phase change energy storage material integrating phase change energy storage and thermochemical energy storage, a preparation method thereof, and a battery thermal management system. Background technique [0002] The rapid development of the transportation industry has brought a huge challenge to energy security issues. While consuming fossil energy, a large amount of carbon dioxide is produced, which aggravates environmental degradation. In response to the energy and environmental problems caused by transportation, countries around the world are actively promoting more efficient and cleaner new energy electric vehicles. As the electric vehicle market continues to expand, the performance and safety of lithium-ion batteries have also received continuous attention. The battery needs to be within the optimal operating temperature range to ensure c...

Claims

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Application Information

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IPC IPC(8): C09K5/06H01M10/653H01M10/659
CPCC09K5/063H01M10/653H01M10/659Y02E60/10
Inventor 张正国李穗敏凌子夜方晓明
Owner SOUTH CHINA UNIV OF TECH
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