Early Fire Suppression Flame Retardant Pouch for Portable Battery Packs

Abstract

The present invention relates to a flame-retardant pouch for early fire suppression of an auxiliary battery, comprising a composite film including an aluminum foil layer; an aerogel non-combustible foam layer; and an LLDPE (Linear Low Density Polyethylene) layer, wherein each layer is bonded through an adhesive that provides flame retardancy, the aluminum foil layer is formed in a multilayer structure of 2 to 5 layers, and the aerogel non-combustible foam layer is formed in a multilayer structure such that its blocking ability is adjusted differently depending on the temperature.

Description

Technology Field

[0001] The present invention relates to a flame-retardant pouch for early fire suppression of an auxiliary battery, for preventing fire and spread of an auxiliary battery fire in an airplane. Background Technology

[0002] Recently, frequent aircraft accidents have occurred due to fires in portable batteries on airplanes, and this issue is receiving significant attention in news and newspaper articles. As measures to detect and respond to portable battery fires early are currently being discussed, it is considered necessary to develop such a product.

[0003] However, there are currently no specific products available to prevent this problem, and the closest alternatives are limited to flame-retardant and explosion-proof films, highlighting the need for further development. Accordingly, products designed to prevent auxiliary battery explosions using flame-retardant films and fire suits are being developed; however, film-based products have physical limitations, while products utilizing fire suits are expensive and heavy.

[0004] Accordingly, the inventors have developed a product that reduces fires originating from the auxiliary battery itself and extinguishes them internally within the auxiliary battery components. The problem to be solved

[0005] The present invention aims to provide a flame-retardant pouch for early fire suppression of an auxiliary battery, which is composed of an aluminum foil layer, an aerogel non-combustible foam layer, and an LLDPE layer to solve the aforementioned problems, and which maximizes the characteristics of each material to suppress the spread of heat and flames in the event of an airplane auxiliary battery fire and ensure long-term durability even in high-temperature environments. means of solving the problem

[0006] The present invention provides a flame-retardant pouch for early fire suppression of an auxiliary battery, comprising a composite film including an aluminum foil layer; an aerogel non-combustible foam layer; and an LLDPE (Linear Low Density Polyethylene) layer, wherein each layer is bonded through an adhesive that provides flame retardancy, the aluminum foil layer is formed in a multilayer structure of 2 to 5 layers, and the aerogel non-combustible foam layer is formed in a multilayer structure such that its blocking ability is adjusted differently depending on the temperature. Effects of the invention

[0007] The present invention provides a flame-retardant pouch for early fire suppression of an airplane auxiliary battery, which is composed of an aluminum foil layer, an aerogel non-combustible foam layer, and an LLDPE layer, and maximizes the characteristics of each material to suppress the spread of heat and flames in the event of an airplane auxiliary battery fire and ensure long-term durability even in high-temperature environments.

[0008] The flame-retardant pouch for early fire suppression of auxiliary batteries according to the present invention can rapidly block initial flame and heat spread through a multilayer structure of aluminum foil and a flame-retardant adhesive layer, and performance degradation caused by moisture, chemicals, and external environmental factors can be prevented due to an aerogel surface coating.

[0009] The flame-retardant pouch for early fire suppression of auxiliary batteries according to the present invention includes an LLDPE layer to protect the pouch from mechanical shock and external pressure, thereby increasing structural stability.

[0010] Accordingly, the flame-retardant pouch for early fire suppression of auxiliary battery fires according to the present invention can prevent the spread of fire and significantly improve safety in the event of an aircraft auxiliary battery fire accident. Brief explanation of the drawing

[0011] FIG. 1 is a schematic cross-sectional view of a composite film forming a flame-retardant pouch for early fire extinguishing of an auxiliary battery according to the present invention. FIG. 2 is a schematic cross-sectional view of a structure in which a battery is sealed in a flame-retardant pouch for early fire extinguishing of an auxiliary battery according to the present invention. Figure 3 is a photograph of a battery sealed in a flame-retardant pouch for early fire extinguishing of an auxiliary battery according to the present invention. Specific details for implementing the invention

[0012] The present invention will be described in detail below.

[0013] The flame-retardant pouch for early fire extinguishing of auxiliary batteries according to the present invention is,

[0014] A flame-retardant pouch for early fire suppression of an auxiliary battery, comprising a composite film including an aluminum foil layer; an aerogel non-combustible foam layer; and an LLDPE (Linear Low Density Polyethylene) layer,

[0015] Each of the above layers is bonded through a flame-retardant adhesive, the aluminum foil layer is formed into a multilayer structure of 2 to 5 layers, and the aerogel non-combustible foam layer is formed into a multilayer structure so that the blocking ability is adjusted differently depending on the temperature.

[0016] Aluminum foil layer

[0017] The aforementioned aluminum foil layer possesses reflective and conductive properties, allowing it to rapidly dissipate heat in the event of a fire, thereby preventing its spread. As aluminum is a highly conductive material, it enhances the conductivity of devices such as batteries, making it effective for fire prevention. Furthermore, aluminum foil is stable against most chemicals; it does not react chemically or reacts only minimally, allowing it to withstand chemical shocks effectively. Additionally, it exhibits minimal interaction when combined with chemically resistant materials, which is advantageous for preventing fires or accidents. Moreover, aluminum foil is flexible and easily deformable, allowing it to be manufactured into various shapes and utilized for diverse applications such as packaging, insulation, and fire prevention materials. Furthermore, aluminum has the property of blocking electromagnetic waves, making it useful for electromagnetic shielding and for preventing electromagnetic interference (EMI) in electronic devices and communication equipment. Moreover, aluminum naturally forms a protective layer called aluminum oxide (Al2O₃), providing relatively strong resistance to corrosion or damage caused by the external environment. In addition, aluminum is a very lightweight metal that offers high durability with minimal weight. Thanks to this lightness, it is easy to mount on a variety of products and is particularly useful for portable devices or products.

[0018] The above aluminum foil layer is formed into a multilayer structure of 2 to 5 layers.

[0019] The above aluminum foil layer is coated with a fire-resistant silicone or treated with a non-flammable chemical, thereby enhancing non-flammability and increasing corrosion resistance, enabling sustained durability performance in high-temperature environments.

[0020] The aluminum foil layer may have a thickness of 6 to 50 μm.

[0021] Aerogel Non-combustible Foam Layer

[0022] The above-mentioned aerogel non-combustible foam layer in the flame-retardant pouch for fire spread prevention prevents the spread of fire, does not deform at high temperatures, and provides heat resistance.

[0023] Available non-combustible foams include polyurethane non-combustible foam, polyethylene non-combustible foam, ethylene vinyl acetate (EVA) non-combustible foam, silicone non-combustible foam, melamine non-combustible foam, carbon fiber non-combustible foam, etc.

[0024] Polyurethane non-combustible foam is lightweight and offers excellent shock absorption capabilities, enabling the mass production of non-combustible products at a low cost. Polyethylene non-combustible foam possesses superior thermal insulation, shock absorption, high durability, and chemical resistance; due to its high chemical stability, it is used in products that withstand heat and flames. Ethylene vinyl acetate (EVA) non-combustible foam is a highly durable material with excellent shock absorption capabilities and is used in products requiring high heat resistance and thermal insulation. Silicone non-combustible foam maintains its shape and does not ignite even at high temperatures due to its stability, heat resistance, chemical resistance, and flexibility; therefore, it is used in fire protection products and electronic device protection products operated in high-temperature environments. Carbon fiber non-combustible foam, with its outstanding heat resistance, high strength, and heat resistance, is used in fireproof pads and protective equipment required for high-temperature environments in the aviation and automotive industries.

[0025] Aerogel has the characteristic of having very low thermal conductivity, so it has a significant advantage in effectively blocking high temperatures during a fire and protecting against the diffusion of internal heat.

[0026] In addition, it has the advantage of maintaining its shape even in high-temperature environments. Since aerogel itself is non-flammable, it does not burn in fire situations and is useful for preventing fire spread. It does not burn even in the presence of oxygen and maintains its performance in high-temperature environments. As the lightest solid, aerogel is lighter than air, so when applied to fire-resistant pouches or heat-insulating products, it provides effective performance while minimizing weight burden. Although aerogel is brittle, processing it into non-combustible foam allows it to be manufactured into stronger and more flexible forms, making it suitable for a wide variety of products. Aerogel possesses excellent durability, remains stable in both high and low-temperature environments, and has chemical resistance for long-term use, enabling effective protection even in extreme conditions.

[0027] Aerogel non-combustible foam is used in fire-resistant pouches or battery protection cases to prevent fires in batteries or electronic devices and to rapidly block heat in the event of a fire; therefore, it is used for protecting electric vehicle batteries and insulating heat within vehicles. In particular, since lithium-ion batteries in electric vehicles pose a risk of thermal runaway or fire, the use of aerogel can enhance the safety of the battery pack. Additionally, aerogel non-combustible foam blocks heat that may be generated in electronic devices such as smartphones and laptops, preventing fires caused by overheating.

[0028] The above-mentioned aerogel non-combustible foam layer is formed in a multi-layer structure so that its blocking ability is adjusted differently depending on the temperature.

[0029] The above aerogel non-combustible foam layer may be a high-density aerogel non-combustible foam layer in which the density of the non-combustible foam is maximized through a pressurization process.

[0030] The above-mentioned aerogel non-combustible foam layer has a density of 0.020 to 0.300 g / cm³ 3 It could be.

[0031] The above-mentioned aerogel non-combustible foam layer may have a non-combustible silicone coating or a moisture barrier coating applied to its surface to prevent damage caused by moisture or chemicals, thereby improving heat insulation performance, chemical stability, moisture resistance, and durability.

[0032] The above aerogel non-combustible foam may have a thickness of 1 to 10 μm.

[0033] <LLDPE 층>

[0034] The above LLDPE is a material widely used in pouch manufacturing and offers various advantages.

[0035] It is resistant to external impacts or pressure and has excellent shock absorption capabilities due to its impact resistance, which prevents easy deformation. It also has good wear resistance, ensuring it does not deform even after long-term use (excellent durability). Furthermore, it possesses high tensile strength and elongation properties, allowing it to maintain the pouch's shape well while remaining soft and flexible (excellent tensile strength). Additionally, it has high resistance to most chemicals, maintaining stable characteristics even in chemically unstable environments, which is advantageous for preventing chemical reactions in high-temperature environments, such as battery fires (excellent chemical resistance). Moreover, it is resistant to moisture and water, allowing for stable use in humid environments, so the fire-prevention pouch can maintain its performance without structural deformation even if exposed to moisture or water (moisture resistance). Furthermore, it offers high flexibility, making it easy to process into various shapes. This allows for application in various designs and forms during pouch manufacturing, and it is advantageous for mass production as it can be thermoformed or extruded (flexibility, processability). Additionally, it is relatively inexpensive, making it advantageous for mass production. Since a large volume of pouches can be manufactured without high cost burdens, the economic efficiency of the product can be enhanced. In addition, it is advantageous in terms of eco-friendliness as it minimizes the environmental impact of the product by using recyclable materials (eco-friendliness). Furthermore, it has excellent water resistance, which prevents moisture from penetrating into the pouch, making it advantageous for protecting electronic devices such as batteries (water resistance, waterproofness).

[0036] The above adhesive may be an epoxy or PU adhesive, and forms an adhesive layer between the aluminum foil layer and the aerogel non-combustible foam layer, and forms an adhesive layer between the aerogel non-combustible foam layer and the LLDPE layer.

[0037] The thickness of the adhesive layer may be 10 to 100 μm, preferably 20 to 60 μm.

[0038] By bonding the aluminum foil layer and the aerogel non-combustible foam using a flame-retardant adhesive, fire resistance performance can be further improved through the combined performance of the aluminum foil and the flame-retardant adhesive layer.

[0039] The above LLDPE may have excellent heat sealing properties and may have the characteristics of having a density in the range of 0.915 to 0.925.

[0040] The above LLDPE may have a thickness of 30 to 200 μm.

[0041] In one embodiment of the present invention, aluminum foil is composed of five layers, and aerogel flame-retardant foam is manufactured in a multilayer design with different thicknesses so that the high / low temperature blocking ability can be designed to vary by section.

[0042] The present invention will be explained in detail below through examples.

[0043] <Example 1>

[0044] The aluminum foil layer was formed with a five-layer structure, with each layer having a thickness of 6 μm and a total thickness of 30 μm. The fire resistance and corrosion resistance of the aluminum foil layer were enhanced through a fire-resistant silicone coating and an anti-oxidation heat treatment. The aerogel non-combustible foam layer was designed with a three-layer structure, with the first layer being a low-density layer (0.05 g / cm³, 3 mm), the second layer a medium-density layer (0.15 g / cm³, 2 mm), and the third layer a high-density layer (0.25 g / cm³, 1 mm), resulting in a total thickness of 6 μm. A non-combustible silicone coating was applied to the surface of the aerogel non-combustible foam layer to enhance moisture resistance and chemical resistance. The LLDPE layer used a heat-sealable material with a thickness of 100 μm and a density of 0.920 g / cm³. Each layer was bonded using a flame-retardant two-component epoxy adhesive, and the thickness of the adhesive layer is approximately 50 μm.

[0045] A flame retardant performance test was conducted on the obtained flame retardant pouch.

[0046] It obtained UL94 VTM-1 grade in flame retardant performance tests, and pouch processability was also ensured.

[0047] <Comparative Example 1>

[0048] The pouch was manufactured using only an LLDPE layer, without including an aluminum foil layer or an aerogel non-combustible foam layer. The pouch did not have sufficient processability, and it was confirmed that it was not flame-retardant as a result of a UL94 rating in a flame retardant performance test.

[0049] <Comparative Example 2>

[0050] The specimen was prepared using only the aerogel non-combustible foam layer and without including the aluminum foil layer and LLDPE layer. The specimen obtained a UL94 VTM-1 rating in the flame retardant performance test, but pouch processability was not secured.

[0051] <Comparative Example 3>

[0052] A specimen was prepared containing only an aluminum foil layer and excluding an aerogel non-combustible foam layer and an LLDPE layer. This specimen had no pouch processability and was determined to be non-flammable in the UL94 flame retardancy test.

[0053] <Comparative Example 4>

[0054] A specimen was prepared including an aluminum foil layer and an aerogel non-combustible foam layer, but without an LLDPE layer. Although pouch processability was not ensured for this specimen, it obtained a VTM-1 rating in the UL94 flame retardancy test.

[0055] <Comparative Example 5>

[0056] A specimen was prepared including an aerogel non-combustible foam layer and an LLDPE layer, but without an aluminum foil layer. The specimen did not have pouch processability and was judged to be VTM-1 grade in the UL94 flame retardancy test.

[0057] Flame-retardant pouch manufacturing Layer composition Pouch processability Flame Retardant Grade Assessment Experiment No. aluminum foil Aerogel fireproof foam LLDPE UL94 rating Comparative Example 1 X X O X Non-flammable Comparative Example 2 X O X X VTM-1 Comparative Example 3 O X X X Non-flammable Comparative Example 4 O O X X VTM-1 Comparative Example 5 X O O X VTM-1 Example 1 O O O O VTM-1 Explanation of the symbols

[0059] A: Aluminum foil / non-combustible foam / LLDPE B: Battery

Claims

Claim 1 A flame-retardant pouch for early fire suppression of an auxiliary battery, comprising a composite film including an aluminum foil layer; an aerogel non-combustible foam layer; and an LLDPE (Linear Low Density Polyethylene) layer, wherein each layer is bonded through an adhesive that imparts flame retardancy, the aluminum foil layer is formed in a multilayer structure of 2 to 5 layers, and the aerogel non-combustible foam layer is formed in a multilayer structure such that its blocking ability is adjusted differently depending on the temperature. Claim 2 A flame-retardant pouch for early fire suppression of auxiliary batteries, wherein the aluminum foil layer is coated with a fire-resistant silicone coating or treated with a non-flammable chemical treatment in claim 1. Claim 3 A flame-retardant pouch for early fire extinguishing of an auxiliary battery, wherein, in claim 1, the aluminum foil layer has a thickness of 6 to 50 μm. Claim 4 A flame-retardant pouch for early fire suppression of an auxiliary battery, wherein, in claim 1, the aerogel non-combustible foam layer is polyurethane non-combustible foam, polyethylene non-combustible foam, ethylene vinyl acetate (EVA) non-combustible foam, silicone non-combustible foam, melamine non-combustible foam, or carbon fiber non-combustible foam. Claim 5 A flame-retardant pouch for early fire suppression of auxiliary battery, wherein the aerogel non-combustible foam layer is manufactured at high density through a pressurization process and has a non-combustible silicone coating or a moisture barrier coating applied to its surface. Claim 6 In claim 1, the aerogel non-combustible foam layer has a density of 0.020 to 0.300 g / cm³ 3 Flame-retardant pouch for early fire suppression of auxiliary batteries. Claim 7 A flame-retardant pouch for early fire suppression of an auxiliary battery, wherein, in claim 1, the aerogel non-combustible foam has a thickness of 1 to 10 μm. Claim 8 A flame-retardant pouch for early fire suppression of an auxiliary battery, wherein, in claim 1, the LLDPE has a thickness of 30 to 200 μm.

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