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Phase-change heat conduction slurry, heat conduction diaphragm and lithium ion battery

A technology of phase change heat conduction and phase change materials, which is applied in the fields of phase change heat conduction paste, battery diaphragm, heat conduction diaphragm and lithium-ion battery. It can solve the problems of poor thermal conductivity, reduce interface impedance, reduce heat production, and improve thermal safety. performance effect

Pending Publication Date: 2021-11-16
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a phase-change heat-conducting material, a heat-conducting diaphragm, and a lithium-ion battery. The phase-change heat-conducting material solves the problem of traditional polyolefin-based film materials and traditional electrodeless particles through the use of expanded graphite composite paraffin phase-change materials. The problem of poor thermal conductivity of the configured ceramic coating itself; reduces the risk of heat accumulation caused by overheating in the local area of ​​the cell, and the risk of positive and negative overlap short circuits after the base film is melted, and improves the stability of the cell body in the cycle and high-rate dynamic tests. thermal safety performance

Method used

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  • Phase-change heat conduction slurry, heat conduction diaphragm and lithium ion battery
  • Phase-change heat conduction slurry, heat conduction diaphragm and lithium ion battery
  • Phase-change heat conduction slurry, heat conduction diaphragm and lithium ion battery

Examples

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Embodiment 1

[0060] This embodiment provides a phase-change heat-conducting slurry, which includes expanded graphite composite paraffin phase-change materials, a binder and a solvent; the solid content of the phase-change heat-conducting slurry is 50 wt%.

[0061] The mass ratio of described expanded graphite composite paraffin phase-change material and binder is 90:10;

[0062] The binder is polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP, 5130); the solvent is water;

[0063] The expanded graphite composite paraffin wax phase change material is prepared by the following method, and the method includes the following steps: mixing expanded graphite and paraffin (melting point 58° C.) according to a mass ratio of 1:1.1, and stirring and blending at 75° C. for 70 minutes to obtain The expanded graphite composite paraffin phase change material;

[0064] The expanded graphite is obtained from expandable graphite (average particle size 50 mesh, expansion rate 200mL / g) through s...

Embodiment 2

[0067] This embodiment provides a phase-change heat-conducting paste, which is the same as that of Embodiment 1 except that the solid content of the phase-change heat-conducting paste is 30 wt%.

Embodiment 3

[0069] This embodiment provides a phase-change heat-conducting paste, which is the same as that of Embodiment 1 except that the solid content of the phase-change heat-conducting paste is 75 wt%.

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Abstract

The invention relates to phase-change heat conduction slurry, a heat conduction diaphragm and a lithium ion battery. The phase-change heat conduction slurry comprises an expanded graphite composite paraffin phase-change material, an adhesive and a solvent. The solid content of the phase change heat conduction slurry is 30-75wt%. The heat conduction diaphragm comprises a base film and phase change heat conduction material layers arranged on the two sides of the base film in a coating mode. The phase change heat conduction material layers are prepared from the phase-change heat conduction slurry. Through use of the expanded graphite composite paraffin phase change material, the problem of poor thermal conductivity of a traditional polyolefin base membrane material and a traditional ceramic coating prepared from electrodeless particles is solved. The risks of heat accumulation caused by overheating of a local area of a battery cell and short circuit caused by lap joint of the positive electrode and the negative electrode after melting of a base film are reduced, and the thermal safety performance of the battery cell body in circulation and rate high dynamic tests is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy, and relates to a battery diaphragm, in particular to a phase-change heat-conducting paste, a heat-conducting diaphragm and a lithium-ion battery. Background technique [0002] With the vigorous development of new energy vehicles, the safety of new energy vehicles has received more and more attention. At present, the power batteries used in new energy vehicles are lithium-ion batteries, which are prone to chain exothermic reactions during charging, acupuncture, and collisions, resulting in thermal runaway, which can lead to serious accidents such as smoke, fire, and even explosions. security incident. Moreover, the energy density, service life and discharge rate of power batteries are greatly affected by temperature. Therefore, power battery thermal management technology is one of the core research and development directions of new energy vehicles. [0003] An ideal lithium-ion battery should...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14C09K5/06H01M10/617H01M10/653H01M10/659
CPCC09K5/063C09K5/14H01M10/617H01M10/653H01M10/659Y02E60/10
Inventor 张馨月其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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