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Power lithium battery uniform-temperature heat dissipation system with graphene heat conduction film

A technology of ene heat conduction film and heat dissipation system, which is applied in the field of uniform temperature heat dissipation system for power lithium batteries, can solve the problem of insufficient heat dissipation effect of copper-based graphene composite heat dissipation film, achieve improved heat dissipation effect, increase contact area, and improve heat dissipation performance Effect

Active Publication Date: 2020-01-14
ZHEJIANG LUYUAN ELECTRIC VEHICLE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat dissipation effect of this ordinary copper-based graphene composite heat dissipation film is not good enough

Method used

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  • Power lithium battery uniform-temperature heat dissipation system with graphene heat conduction film

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Effect test

Embodiment 1

[0033] A power lithium battery temperature equalization and heat dissipation system composed of a graphene thermally conductive film, including a lithium battery body and a copper-based graphene nano-chip composite thermal film coated on the lithium battery body, and a copper-based graphene nano-chip composite thermal film From the inside to the outside, it includes a copper foil base layer and a graphene nano-chip thermal conductive layer.

[0034] In this embodiment, in terms of parts by mass, the graphene nanoflake thermal conductive layer includes 8 parts of copper naphthenate, 50 parts of edge graphene oxide nanoflake, 3 parts of dispersant, and 1 part of auxiliary agent. Among them, the dispersant is calcium stearate. The auxiliary agent includes 0.5 part of silicone resin and 0.5 part of pentaerythritol ester.

[0035] The edge graphene oxide nanoplatelets are prepared by the following steps:

[0036] a. Take natural flake graphite as raw material, steel needle as grinding b...

Embodiment 2

[0046] In this embodiment, according to parts by mass, the graphene nanoflake thermally conductive layer includes 7 parts of copper naphthenate, 45 parts of edge graphene oxide nanoflake, 1 part of dispersant, and 0.5 part of auxiliary agent. Among them, the dispersant is bis-stearic acid amide. The auxiliary agent includes 0.5 part of silicone resin.

[0047] The edge graphene oxide nanoplatelets are prepared by the following steps:

[0048] a. Take natural flake graphite as raw material, steel needle as grinding body, needle-to-material mass ratio 40:1, hydrogen peroxide as grinding medium, and grind for 8h at a magnetic field conversion frequency of 2000r / min to obtain graphene nanoflake.

[0049] b. Mix concentrated sulfuric acid and graphene nanochips at a ratio of 20mL:1g, and cool in an ice salt bath to below 0°C.

[0050] c. Add potassium permanganate 2.5 times the mass of the graphene nanoplatelets, and the system is heated to 30°C, and after stirring for 2 hours, it is cool...

Embodiment 3

[0058] In this embodiment, in terms of parts by mass, the graphene nanoflake thermal conductive layer includes 10 parts of copper naphthenate, 55 parts of edge graphene oxide nanoflake, 4 parts of dispersant, and 2 parts of auxiliary agent. Among them, the dispersant is selected from an equal ratio mixture of calcium stearate and distearic acid amide. The additives include 1.5 parts of silicone resin and 0.5 parts of pentaerythritol ester.

[0059] The edge graphene oxide nanoplatelets are prepared by the following steps:

[0060] a. Take natural flake graphite as raw material, steel needle as grinding body, needle-to-material mass ratio 60:1, hydrogen peroxide as grinding medium, and grind at a magnetic field conversion frequency of 2500r / min for 10h to obtain graphene nano-chips.

[0061] b. Mix concentrated sulfuric acid and graphene nanochips at a ratio of 30mL:1g, and cool in an ice salt bath to below 0°C.

[0062] c. Add potassium permanganate 3.5 times the mass of the graphene...

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Abstract

The invention relates to the technical field of electric vehicle battery heat dissipation, in particular to a power lithium battery uniform-temperature heat dissipation system with a graphene heat conduction film. The system comprises a lithium battery body and a copper-based graphene nanosheet composite heat-conducting film covering the lithium battery body, and the copper-based graphene nanosheet composite heat-conducting film comprises a copper foil base layer and a graphene nanosheet heat-conducting layer arranged in order from inside to outside. By mass, copper naphthenate and edge graphene oxide nanosheets serve as main components of the graphene nanosheet heat-conducting layer, and a graphene oxide-copper-based composite material with a three-dimensional porous structure is obtainedthrough the conjugation effect between an aromatic layer of the edge graphene oxide nanosheets and the copper naphthenate; and the heat dissipation performance is effectively improved through the porous structure.

Description

Technical field [0001] The invention relates to the technical field of battery heat dissipation for electric vehicles, and in particular to a power lithium battery uniform temperature and heat dissipation system composed of a graphene thermal film. Background technique [0002] As environmental pollution becomes more and more serious, people’s awareness of environmental protection continues to increase, and low-carbon and green have gradually become the mainstream of life. Two-wheel electric vehicles are becoming more and more important for people because of their lightness and labor saving. A car driven by electricity and powered by electricity. Because all its driving energy comes from the supply of the battery, if the battery's heat dissipation performance is poor, it will affect the battery's life and work efficiency. [0003] The patent document with the application number CN201621455172.9 discloses such a battery with a copper-based graphene composite heat-dissipating film, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/613H01M10/625H01M10/653H01M10/654
CPCH01M10/613H01M10/625H01M10/653H01M10/654Y02E60/10
Inventor 倪捷陈文胜张芳勇陶兴华冯岩
Owner ZHEJIANG LUYUAN ELECTRIC VEHICLE
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