High-thermal conductivity insulating film for lithium ion and preparation method thereof

A high thermal conductivity, insulating film technology, used in electrical components, electrochemical generators, circuits, etc., can solve problems such as lithium-ion battery safety problems, thermal runaway, short circuit or overcharge that cannot be fundamentally solved , to achieve the effects of easy operation, high thermal conductivity and simple preparation method.

Inactive Publication Date: 2019-07-05
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a high-energy chemical power source, its safety issue is the most concerned issue for those skilled in the art. Lithium-ion batteries will cause internal short circuit or overcharge due to overcurrent, internal dendrites, and other abuses, resulting in internal heat accumulation. When the heat accumulation reaches a certain To a certain extent, it will cause an exothermic chain reaction of the electrolyte and the gas material inside the positive electrode, which will eventually lead to thermal runaway of the lithium battery.
[0003] At present, the way to solve the safety problem of lithium-ion batteries mainly includes the following aspects. One is to ensure its safety through maintenance or auxiliary management, such as preventing short-circuit, overcharge and over-temperature of lithium-ion batteries through the lithium-ion battery management system. , the second is to control the temperature of the battery module by designing a thermal management system in the module, such as an air cooling system and a liquid cooling system, to control the temperature of the lithium-ion battery, and to improve the lithium-ion battery by improving the material of the lithium battery or optimizing the design. The safety of ion batteries, such as improving the stability of positive electrode materials, adding additives such as flame retardant and overcharge prevention to the electrolyte, using new diaphragms, and adopting methods such as insulating and heat-conducting films, and the above methods are limited by various factors. None of them can fundamentally solve the safety problem of lithium-ion batteries

Method used

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  • High-thermal conductivity insulating film for lithium ion and preparation method thereof
  • High-thermal conductivity insulating film for lithium ion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Use a pulverizer to crush the polypropylene material with a thermal conductivity of 0.23W / mk into particles with a diameter of <1mm, wherein the polypropylene material accounts for 80% by weight;

[0029] Step 2: Use a hot-melt machine to heat it to 200±5°C to melt it, add Al2O3 with a particle size of 100-500 microns in proportion, and the mass of Al2O3 accounts for 20% of the total mass, and stir for 5 hours to make the two materials fully mix evenly;

[0030] Step 3: Put it into the feeding system again, pass through the plasticizing machine, prepare a film with a thickness of 0.15mm, and then cool it

[0031] Step 4: After the film is cooled, use a cutting machine to cut into such figure 1 In the shape shown, the insulating film with high thermal conductivity was prepared.

[0032] Take five pieces of the above-mentioned insulating film and soak them in the electrolyte solution, place them in a constant temperature box at 60°C for 7 days, and observe the c...

Embodiment 2

[0036] Step 1: Use a pulverizer to pulverize polypropylene with a thermal conductivity of 0.23W / mk into particles with a diameter of <1mm, wherein the proportion of polypropylene material is 80% by weight;

[0037] Step 2: Use a hot-melt machine to heat it to 200±5°C to melt it, add SiO2 with a particle size of 100-500 microns in proportion, and the mass of the SiO2 accounts for 20% of the total mass, and stir for 5 hours to make the two materials Mix well and evenly;

[0038] Step 3: Put it into the feeding system again, pass through the plasticizing machine, prepare a film with a thickness of 0.15mm, and then cool it

[0039] Step 4: After the film is cooled, use a cutting machine to cut into such figure 1 In the shape shown, the insulating film with high thermal conductivity was prepared.

[0040] Take five pieces of the above-mentioned insulating film and soak them in the electrolyte solution, place them in a constant temperature box at 60°C for 7 days, and observe the c...

Embodiment 3

[0044] Step 1: Use a pulverizer to pulverize polypropylene with a thermal conductivity of 0.23W / mk into particles with a diameter of <1mm, wherein the proportion of polypropylene material is 80% by weight;

[0045] Step 2: Use a hot-melt machine to heat it to 200±5°C to melt it, add BN with a particle size of 100-500 microns in proportion, and the mass of the BN accounts for 20% of the total mass, and stir for 5 hours to make the two materials fully mix evenly;

[0046] Step 3: Put it into the feeding system again, pass through the plasticizing machine, prepare a film with a thickness of 0.15mm, and then cool it

[0047] Step 4: After the film is cooled, use a cutting machine to cut into such figure 1 shape shown, that is prepared into the high thermal conductivity insulating film

[0048] Take five pieces of the above-mentioned insulating film and soak them in the electrolyte solution, place them in a constant temperature box at 60°C for 7 days, and observe the corrosion re...

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Abstract

The invention provides a high-thermal conductivity insulating film. The high-thermal conductivity insulating film comprises the following components in percentage by weight: 60-90% of polypropylene material and 40-10% of a high-thermal conductivity material. A common insulating film is added with the material with a high heat conductivity coefficient, so that the insulating film has the dual characteristics of high heat conductivity and insulativity, has a good insulating function and can actively dissipate heat when the battery generates heat, and the safety performance of the battery is improved, and the bottom portion of the insulating film is provided with a plurality of through holes to facilitate electrolyte infiltration without influence of the performances of the battery, and the preparation method is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a high thermal conductivity insulating film for lithium ions and a preparation method thereof. Background technique [0002] Lithium ion has many advantages such as high energy density, high output power, long cycle life, no pollution, wide operating temperature range and small self-discharge, and is widely used in the field of 3C batteries. Nowadays, with the rapid development of the new energy automobile industry, Lithium-ion batteries have attracted much attention. As a high-energy chemical power source, its safety issue is the most concerned issue for those skilled in the art. Lithium-ion batteries will cause internal short circuit or overcharge due to overcurrent, internal dendrites, and other abuses, resulting in internal heat accumulation. When the heat accumulation reaches a certain To a certain extent, it will cause an exothermic chain reaction of the electrolyt...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/653C08L23/12C08K3/22C08K3/36C08K9/10C08J5/18H01M50/116H01M50/131
CPCH01M10/653C08J5/18C08J2323/12C08K2201/003C08K2003/2227C08K3/36C08K2003/385C08K9/10H01M50/116H01M50/131Y02E60/10
Inventor 周倩张立鹏赵乐张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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