Composite phase change material for heat dissipation of lithium battery and device

A composite phase change material and heat dissipation device technology, which is applied in the field of lithium-ion battery temperature control, can solve the problems of poor temperature consistency and low heat dissipation efficiency, and achieve the effects of good consistency, high heat dissipation rate, and convenient operation and maintenance

Inactive Publication Date: 2011-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of low heat dissipation efficiency and poor temperature consistency in the existing lithium battery heat dissipation device, and provide a kind of heat dissipation

Method used

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  • Composite phase change material for heat dissipation of lithium battery and device
  • Composite phase change material for heat dissipation of lithium battery and device
  • Composite phase change material for heat dissipation of lithium battery and device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Tetradecane (molecular formula: C 24 h 50 ) and expanded graphite composite phase change material, its phase transition temperature is 50°C, where C 24 h 50 The mass fraction is 90%, and the phase change material is solid at room temperature. Select 15 3.2V20Ah single batteries, and use the series connection method to form the battery pack module, such as image 3 As shown; when the battery module is discharged at high power, the temperature of the battery cell rises rapidly, and its heat is transferred to the composite phase change material through the battery casing. When the temperature is higher than 50 ° C, the composite phase change material absorbs heat and generates solid-liquid Phase change, but the composite phase change material still maintains solid properties and stores heat, so as to realize the heat dissipation and cooling of the battery cell and control the temperature rise of the battery cell; when the ambient temperature is 25°C and the discharge ti...

Embodiment 2

[0032] Using lauric acid (molecular formula: CH 3 (CH 2 ) 10 COOH) and expanded graphite composite phase change material, its phase transition temperature is 43 ° C, where CH 3 (CH 2 ) 10 The mass fraction of COOH is 87%, and the phase change material is solid at room temperature. Select 15 3.2V20Ah single batteries, and adopt the method of series connection to form a battery pack module; when the battery module is discharged at high power, the temperature of the battery monomer rises rapidly, and its heat is transferred to the composite phase change material through the battery shell. At 43°C, the composite phase change material absorbs heat and undergoes a solid-liquid phase transition, but the composite phase change material still maintains solid properties and stores heat, thereby realizing heat dissipation and cooling of the battery cell and controlling the temperature rise of the battery cell ; When the ambient temperature is 25°C and the discharge time is 20s, the ...

Embodiment 3

[0034] Using palmitic acid (molecular formula: CH 3 (CH 2 ) 14 COOH) and aluminum foam composite phase change material, its phase transition temperature is 64 ° C, where CH 3 (CH 2 ) 14 The mass fraction of COOH is 60%, and the phase change material is solid at room temperature. Select 15 pieces of 3.2V20Ah single batteries, and adopt the method of series connection to form the battery pack module; when the battery module is discharged at high power, the temperature of the battery monomer rises rapidly, and its heat is transferred to the composite phase change material through the battery shell, when the temperature is high At 64°C, the composite phase change material absorbs heat and undergoes a solid-liquid phase transition, but the composite phase change material still maintains solid properties and stores heat, thereby realizing heat dissipation and cooling of the battery cell and controlling the temperature rise of the battery cell ; When the ambient temperature is 2...

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Abstract

The invention discloses a composite phase change material for heat dissipation of a lithium battery and a device. The device comprises a top cap 1, a box body 2 and partition plates 4; and cavities of corresponding number are partitioned in the box body 2 according to the number of single batteries 3 to be radiated, an air runner 5 is formed between the adjacent partition plates, and the composite phase change material 4 with phase change temperature of between 40 and 70 DEG C is filled in the cavities. When the device starts working, the heat of the single batteries is transferred to the composite phase change material; and when the temperature is higher than the phase change temperature of the phase change material, the phase change material absorbs the heat, produces phase change and stores the heat so as to realize heat dissipation and cooling of the single batteries. The composite phase change material has high coefficient of heat conductivity, keeps the size in the phase change process, has high heat storage, heat release and heat dissipation rate, has no liquid liquidity or leakage, is easily encapsulated, is convenient to operate and maintain, and can improve the working performance and the reliability of the batteries when used for the heat dissipation of the high-power and quick charge/discharge power lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery temperature control, relates to a heat dissipation method for a power lithium battery, and in particular to a composite phase change material and a device for heat dissipation of a lithium battery. Background technique [0002] Due to the advantages of no pollution, low noise, simple structure, convenient use and maintenance, and high energy conversion efficiency, electric vehicles have become the development direction of future automobiles. As the heart of electric vehicles, the power battery is the source of power for the vehicle, and it is also a key factor restricting the development of electric vehicles. [0003] In recent years, power lithium batteries have gradually become the mainstream power source for electric vehicles. In electric vehicles, multiple single lithium batteries are usually connected in series or in parallel in different forms to form a battery device to provide...

Claims

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Application Information

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IPC IPC(8): C09K5/06H01M10/50H01M10/659
CPCY02E60/12Y02E60/10
Inventor 张正国方晓明高学农方玉堂徐涛王学泽
Owner SOUTH CHINA UNIV OF TECH
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