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Flexible composite phase change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system

A composite phase-change material and ion battery technology, which is applied in the field of ion batteries, can solve the problems of not being able to meet the thermal management requirements of drone power battery packs, not being able to use thermal management methods, and not being able to fit the batteries tightly, so as to achieve light weight, Small size, good flexibility

Pending Publication Date: 2022-08-05
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the use scenarios of UAVs are often more complex than those of land vehicles. The temperature at high altitudes is changeable, and the severe cold conditions have a greater impact on the mileage and even the safety of UAVs.
Due to the extremely high volume and weight requirements of drone power batteries, the battery pack cannot use traditional power battery thermal management methods such as heat pumps, etc.
However, the ordinary electric heating pad is a rigid material, which cannot be tightly bonded to the battery, prone to local hot spots, and cannot meet the thermal management requirements of the UAV power battery pack.

Method used

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  • Flexible composite phase change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system
  • Flexible composite phase change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system
  • Flexible composite phase change material, preparation method and application thereof, battery heating element and ion battery pack with low-temperature thermal management system

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preparation example Construction

[0039] The present invention provides the preparation method of the flexible composite phase change material described in the above technical solution, comprising the following steps:

[0040] Mixing the polymer matrix, the organic phase change material, the spherical conductive filler and the multi-dimensional conductive filler to obtain a mixture;

[0041] The mixture is milled to obtain the flexible composite phase change material.

[0042] In the present invention, a polymer matrix, an organic phase change material, a spherical conductive filler and a multi-dimensional conductive filler are mixed to obtain a mixed material.

[0043] In the present invention, the mixing preferably comprises the following steps:

[0044] The polymer matrix and the organic phase change material are heated and then mixed for a first time to obtain a first mixed material;

[0045] The first mixture, the spherical conductive filler and the multi-dimensional conductive filler are mixed for a se...

Embodiment 1

[0079] 21 parts of SEBS and 49 parts of paraffin wax (melting temperature of 44°C) were heated and mixed evenly, and the ratio of the two was 3:7, as the matrix of the phase change material; then two conductive fillers, carbon black and expanded graphite, were added and mixed evenly. The mass fraction of black is 35 parts, and the mass fraction of expanded graphite is 1 part, and the mixture is uniformly mixed to obtain a mixture; and then the mixture is put into an open mill for 30min opening, and the opening temperature is 135 ℃ to obtain a flexible composite phase change material;

[0080] The flexible composite phase change material was vulcanized at 135°C to obtain a heating pad with a thickness of 3 mm.

[0081] The heating pad prepared in this example has good flexibility and can be bent arbitrarily. Through the temperature-resistance experiment, the heating pad is placed in a high and low temperature box, and the temperature rise and fall test is performed, and the res...

Embodiment 2

[0083] 24 parts of SEBS and 48 parts of paraffin wax (melting temperature of 44°C) are heated and mixed evenly, the ratio of the two is 4:6, as the matrix of the phase change material; then carbon black and expanded graphite conductive filler are added and mixed evenly, among which the mass of carbon black is The parts are 20 parts, and the mass parts of expanded graphite are 5 parts, and the mixture is uniformly mixed to obtain a mixture; then the mixture material is put into an open mill for opening for 30 minutes, and the opening temperature is 135 ° C to obtain a flexible composite phase change material;

[0084] The flexible composite phase change material was vulcanized at 135°C to obtain a heating pad with a thickness of 3 mm.

[0085] The heating pad prepared in this example is used for low-temperature preheating of a square lithium-ion battery pack. figure 1 Shown is a cross-sectional view of the low-temperature thermal management system for a square lithium-ion batte...

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Abstract

The invention belongs to the technical field of ion batteries, and particularly relates to a flexible composite phase change material, a preparation method and application thereof, a battery heating piece and an ion battery pack with a low-temperature heat management system. The invention provides a flexible composite phase change material. The flexible composite phase change material comprises the following components in parts by mass: 20-35 parts of spherical conductive filler, 1-5 parts of multi-dimensional conductive filler, 20-30 parts of polymer matrix and 40-50 parts of organic phase change material. The flexible composite phase change material provided by the invention has the characteristic of flexibility, and can be well attached to the surface of a battery, so that the heat transfer resistance is reduced, and local hot spots are avoided; meanwhile, good conductivity is achieved, rapid heating can be achieved by applying small voltage, and therefore the battery can be rapidly and efficiently preheated; and constant-temperature heating can be achieved, and higher safety is achieved.

Description

technical field [0001] The invention belongs to the technical field of ion batteries, in particular to a flexible composite phase change material, a preparation method and application thereof, a battery heating element, and an ion battery pack with a low temperature thermal management system. Background technique [0002] Lithium-ion batteries are widely used in various vehicles such as automobiles, drones, and electronic devices. However, when lithium-ion batteries are used in a low temperature environment, the low temperature will reduce the conductivity of the electrolyte and the diffusion rate of lithium ions, resulting in a drop in battery voltage, a rapid decline in battery capacity, and a decrease in battery life, even permanent capacity loss and lithium ion. plating. Lithium plating increases the risk of short circuits inside the battery, resulting in fire and explosion. Therefore, when a lithium-ion battery is used in a low temperature environment, a power battery...

Claims

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Application Information

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IPC IPC(8): H05B3/10H05B3/14H05B3/34H01M10/615H01M10/6571
CPCH05B3/10H05B3/14H05B3/34H01M10/615H01M10/6571Y02E60/10
Inventor 罗明昀凌子夜张正国方晓明
Owner SOUTH CHINA UNIV OF TECH
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