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Heat insulation sleeve for battery and preparation method thereof

A heat insulation sleeve and battery technology, which is applied in the direction of battery box/jacket, battery box/cover material, secondary battery, etc., can solve the problems of limited heat insulation effect, volume energy density influence, increased weight, etc., and achieve excellent heat insulation Great effect on thermal performance and market application prospect

Pending Publication Date: 2020-07-17
SHANGHAI BINET INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The simplest conventional method is to increase the gap between the batteries, but this method will have a significant impact on the volumetric energy density of the system. Another common method is to pour glue between the batteries, which has a low thermal conductivity The potting glue is also 0.2-0.4W / mK, while increasing the weight, the heat insulation effect is also very limited

Method used

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  • Heat insulation sleeve for battery and preparation method thereof
  • Heat insulation sleeve for battery and preparation method thereof
  • Heat insulation sleeve for battery and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0032] The preparation method of the battery heat insulating sleeve of the present application comprises the following steps:

[0033] (1) Airgel powder is mixed with water-based binder;

[0034] (2) soak the mixture of step (1) on the fiber layer or the foam layer and dry;

[0035] (3) Spray PTFE on the outside of the fiber layer for hydrophobic treatment.

Embodiment 1

[0037] Such as figure 1 As shown, (1) SiO 2 Airgel powder and acrylic adhesive are mixed in a weight ratio of 6:4; (2) soak the mixture in step (1) on the polyester fiber with a thickness of 100 microns (um) and dry; (3) in the fiber layer Spraying on the outside: Polytetrafluoroethylene (PTFE) for hydrophobic treatment; (4) Make the three-layer heat insulation sleeve into a circular pipe with a flat diameter of 55 mm (mm); put the heat insulation sleeve on a phosphoric acid pipe with a diameter of 32 mm and a height of 140 mm. On the cylindrical battery of iron lithium, such as Figure 2-3 shown. When the fully charged single battery is short-circuited, test the temperature on the surface of the heat insulation cover, the maximum is 50 degrees Celsius (°C).

Embodiment 2

[0039] Such as figure 1 As shown, (1) SiO 2 Airgel powder and polyester adhesive are mixed in a weight ratio of 6:4; (2) soak the mixture in step (1) on the phenolic foam layer with a thickness of 100um and dry; (3) on the outside of the fiber layer Spray PTFE for hydrophobic treatment; (4) Make the three-layer heat insulation sleeve into a circular pipe with a flat diameter of 55mm; put the heat insulation sleeve on a lithium iron phosphate cylindrical battery with a diameter of 32mm and a height of 140mm, such as Figure 2-3 shown. When the fully charged single battery is short-circuited, the temperature on the surface of the heat insulation cover is tested, and the maximum is 53°C.

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Abstract

The invention relates to a heat insulation sleeve for a battery and a preparation method thereof, and belongs to the technical field of battery protection. The heat insulation sleeve is of a three-layer structure and comprises a hydrophobic material layer on the surface, a fiber layer or a foaming layer in the middle and an aerogel layer on the inner layer. The aerogel layer of the inner layer iscomposed of aerogel powder and a water-based binder. The thickness of the surface hydrophobic material layer is 0.1-100 [mu] m. The aerogel layer is combined with the middle fiber layer or the foaminglayer so that high specific surface area, high void ratio, low density, low heat conductivity coefficient and high electrical insulating property can be achieved. The hydrophobic layer prevents external moisture from entering the middle layer and the aerogel layer, and heat conductivity coefficient increase caused by moisture is avoided. The heat insulation sleeve material has excellent heat preservation and heat insulation performance, waterproofness, insulativity, elasticity and strength and has huge market application prospects.

Description

technical field [0001] The application relates to a battery heat insulation package, in particular to a battery heat insulation cover and a preparation method thereof, belonging to the technical field of battery protection. Background technique [0002] With the further intensification of environmental pollution, new energy vehicle technology has been unprecedentedly developed. Battery thermal management is one of the key technologies for new energy vehicles. The root cause of the fire and explosion of large-capacity battery packs is thermal runaway inside the battery. When the internal temperature of one or several batteries exceeds 90°C, the SEI film will decompose one after another, the negative electrode will react with the electrolyte, the diaphragm will decompose, the positive electrode will decompose, the electrolyte will decompose, large-scale internal short circuit, and the electrolyte will burn. Higher and higher, and then burst into flames and explosions. [00...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/625H01M10/653H01M10/658
CPCH01M10/625H01M10/653H01M10/658H01M50/116H01M50/124Y02E60/10
Inventor 娄豫皖许祎凡孟祎凡李紫璇
Owner SHANGHAI BINET INFORMATION TECH CO LTD
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