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Profile of elastic silica aerogel for lithium ion power batteries of new energy vehicles

A new energy vehicle, silicon dioxide technology, applied in the direction of electrical components, battery pack components, secondary batteries, etc., can solve the problems of thermal runaway of peripheral batteries, sudden increase in heat production, hidden safety hazards, etc., to improve reliability and Safety, the effect of slowing down the transmission speed

Inactive Publication Date: 2018-12-28
PAN ASIAN MICROVENT TECH JIANGSU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Less attention has been paid to efficient heat insulation, flame retardancy, vibration reduction, and thermal runaway protection between cells. However, when a battery cell triggers thermal runaway, the heat production increases sharply, and the heat dissipation is much smaller than the heat production. The heat is transferred to the surrounding batteries. Transmission will quickly cause large-scale thermal runaway of surrounding batteries, forming a potential safety hazard caused by the level of thermal runaway triggered by a single cell and then spread to the entire battery system

Method used

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  • Profile of elastic silica aerogel for lithium ion power batteries of new energy vehicles
  • Profile of elastic silica aerogel for lithium ion power batteries of new energy vehicles
  • Profile of elastic silica aerogel for lithium ion power batteries of new energy vehicles

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preparation example Construction

[0029] The preparation method of silica sol liquid includes adding 100~120ml of coagulant into 800~1000ml of solvent and stirring evenly, then adding 160~180ml of methyltrimethoxysilane and 90~120ml of silicon source, stirring evenly, Add 150-170ml of gel accelerator and stir again to obtain a silica sol liquid. The rotation speed of uniformly stirring the solution is 50~300 rpm.

[0030] The silicon source includes one or more of dimethyldimethoxysilane, ethyl orthosilicate, ethyl silicate and silicic acid; the gel accelerator is 1,2-propylene oxide, and the coagulant is ten Hexaalkyltrimethylammonium chloride or octadecyltrimethylammonium chloride; the solvent is dilute hydrochloric acid solution with a concentration of 1.5×10-5mol / ml-3×10-5mol / ml.

[0031] When adding a gel accelerator to the sol liquid, a flame retardant is also added, preferably an environmentally friendly halogen-free flame retardant, and the sol liquid is aged in the mold to form a wet gel, and the sol...

Embodiment 1

[0034] Embodiment 1: The manufacture method of elastic silica airgel special-shaped part 1: the cetyltrimethylammonium chloride of 100ml is added to the hydrochloric acid solvent that 800ml concentration is 1.5 * 10-5mol / ml and stir evenly, The stirring speed is 50 rev / min, then add 160ml of methyltrimethoxysilane and 90ml of dimethyldimethoxysilane, stir evenly to form a sol, the stirring speed is 50 rev / min, add 150ml of 1,2- Propylene oxide, stir again to form a sol, the stirring speed is 50 rpm, pour the sol into the mold, age the gel in an oven at a temperature of 30 degrees Celsius, and then perform two solvent replacements, and the solvent replacement is taken out every 12 hours The mould, replace the solvent precipitated by the wet gel with alcohol, and get a block wet gel after the solvent is fully replaced, and dry it in an oven at a low temperature to dry gel. Elastic Silica Airgel Shaped Part 1 .

Embodiment 2

[0035]Embodiment 2: the manufacture method of elastic silica airgel special-shaped part 1: the octadecyltrimethylammonium chloride of 110ml is added to the hydrochloric acid solvent that 900ml concentration is 2 * 10-5mol / ml and stir evenly, The stirring speed is 180 rpm, then add 170ml of methyl trimethoxysilane and 110ml of ethyl orthosilicate, stir evenly to form a sol, the stirring speed is 175 rpm, add 160ml of 1,2-propylene oxide , Stir again to form a sol, the stirring speed is 170 rpm, pour the sol into the mold, age the gel in an oven at a temperature of 45 degrees Celsius, and then perform three solvent replacements. The solvent replacement is to take out the mold every 12 hours and use alcohol Substitute the solvent precipitated from the wet gel, and get a massive wet gel after the solvent is fully replaced, and dry it in a microwave oven or oven at a low temperature to dry gel, the oven temperature is 48 degrees Celsius, and the microwave heating and drying method i...

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Abstract

The invention discloses a profile of elastic silica aerogel for lithium ion power batteries of new energy vehicles. The profile is arranged between single battery cells. A manufacture method comprises: firstly, the mould is designed according to the shape of the single cell core; secondly, the silica sol is put in the designed mould to form wet gel after aging, and the solvent with low surface tension coefficient is used for at least two times to replace the water in the wet gel, and then the elastic silica aerogel profiles are obtained by drying and demoulding after displacing the water in the wet gel. As the method is adopted, the invention added the profile between the single cells of lithium ion batteries, and slows down the propagation speed of heat runaway; the profile can also be applied to the heat insulation and shock protection between the modules, the external cold protection layer and the high temperature insulation layer of the battery box, so as to improve the reliabilityand safety of the power supply of the lithium-ion power battery of the new energy vehicle, and to assist the development of the new energy vehicle industry in China.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a special-shaped piece of elastic silica airgel for lithium-ion power batteries of new energy vehicles. Background technique [0002] The main power source of new energy vehicles comes from the power battery system, which determines the driving performance, safety performance and lifespan of new energy vehicles. Especially for pure electric vehicles, all power comes from its battery system. The power battery system is generally composed of battery modules, battery management system BMS, thermal management system, and some electrical and mechanical systems. The power battery module consists of several to hundreds of single battery cells connected in parallel and in series. When the vehicle is in different driving conditions and environments, the single battery cell will generate a certain amount of heat while outputting electric energy due to its own resistance, which will cau...

Claims

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Application Information

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IPC IPC(8): H01M2/10H01M10/625H01M10/658H01M50/20
CPCH01M10/625H01M10/658H01M50/20Y02E60/10
Inventor 丁荣华雷伟花金旦李炳健宋海民陈宇锋陈卫红王琪郭祥
Owner PAN ASIAN MICROVENT TECH JIANGSU CORP
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