Battery Storage Pouch with Fire Propagation Prevention Function

Abstract

The present invention relates to a battery storage pouch having a fire spread prevention function, characterized by comprising a main body having a storage space for storing a battery and an entrance, and a fire extinguishing pad mounted on the main body that discharges nitrogen-based gas in the event of thermal runaway of the battery. According to the present invention, when thermal runaway occurs, a nitrogen-based gas released from the fire extinguishing pad flows into and circulates within the storage space, thereby reducing the oxygen concentration and suppressing flame spread.

Description

Technology Field

[0001] The present invention relates to a battery storage pouch having a fire spread prevention function, and more specifically, to a pouch for storing a battery that can secure initial response time by preventing or suppressing the external spread of flames when thermal runaway occurs in a battery used for supplying charging power to mobile phones, etc. Background Technology

[0003] Generally, batteries are used to supply power for various electrical devices, such as mobile phones.

[0004] These batteries are manufactured and distributed in various forms depending on their intended use, such as being built into electrical devices or serving as replacement or auxiliary batteries. In particular, the use of lithium-ion batteries has recently been surging in diverse fields, including not only mobile phones but also electric scooters and drones.

[0005] However, thermal runaway can occur in lithium-ion batteries due to various causes such as external impact, overcharging, and internal short circuits. In such cases, the rapid release of high heat, flames, and explosive gases poses a high risk of leading to a large-scale fire, making early response crucial.

[0006] Meanwhile, conventional battery storage bags or cases focus on simple protection or portability, and thus lack sufficient functionality to suppress the spread of fire caused by thermal runaway.

[0007] In particular, if a battery fire occurs in a confined or semi-confined space such as indoors, inside a vehicle, or in a warehouse, the spread of flames and secondary fires can cause serious damage to life and property.

[0008] Therefore, there is a need for a safety storage pouch with a structure that physically suppresses the external spread of flames and heat in the initial stages of thermal runaway fires that may occur during battery storage or while waiting to charge, allowing users to respond more safely.

[0010] Prior art related to such battery storage pouches includes published patent No. 10-2026-0006339 (Reference 1) and registered patent No. 10-2912316 (Reference 2).

[0011] Reference 1 above relates to a pouch for storing lithium-ion batteries, characterized by being composed of a board body made of a semi-flame-retardant material with an open top to accommodate a lithium-ion battery inside, and a cover member made of a fabric material that is coupled to wrap around the outer side of the board body and has a flame-retardant coated surface.

[0012] Reference 2 relates to a battery pouch for preventing fire spread, and comprises: a body portion composed of flame-retardant fibers and having a battery storage space formed inside; a cap portion coupled to the upper part of the body portion to seal the stored battery from the external environment; and a fire extinguishing patch embedded in the body portion; wherein the fire extinguishing patch comprises a plurality of fire extinguishing capsules and a detection liquid, so that when a fire occurs in the stored battery, the fire extinguishing liquid filled is released by the breakage of the fire extinguishing capsules to perform initial fire suppression, and the fire extinguishing liquid comprises a fire extinguishing agent composed of perfluoro(2-methyl-3-pentanone) and a color-developing activator composed of hypochlorous acid (HOCl), and the detection liquid comprises N,N-diethyl-p-phenylene diamine (DPD reagent), wherein when the fire extinguishing liquid leaks due to the breakage of the fire extinguishing capsules, the detection liquid changes color by reacting with the color-developing activator to check for abnormalities.

[0013] However, the pouch proposed in Reference 1 above has a structural problem in that, although the cover member is made of a fabric material with a flame-retardant coating and may not easily catch fire, it lacks a heat (temperature) blocking function, and the board body has multiple board holes formed to discharge heat generated from the lithium-ion battery stored inside to the outside, which can cause high-temperature flames to spread rapidly to the cover member.

[0014] In addition, the pouch proposed in Reference 2 is composed of flame-retardant fibers and has a fire extinguishing patch embedded in a body part that has a battery storage space formed inside, thereby blocking oxygen by causing the extinguishing liquid to leak out through the rupture of the fire extinguishing capsule in the event of a battery fire. However, the outer shell of the fire extinguishing capsule is made of melamine resin, which poses a high risk of damage due to physical impact. Furthermore, nitrogenous gases (including N2) may be generated during the thermal decomposition process of the melamine resin, but since these gases remain within the sealed space and are not sufficiently delivered to the stored battery, there is a problem in that it is difficult to fully perform functions such as oxygen sealing and flame suppression. Prior art literature

[0016] Reference 1: Published Patent No. 10-2026-0006339. Reference 2: Registered Patent No. 10-2912316. The problem to be solved

[0017] The present invention aims to solve conventional problems by providing a battery storage pouch capable of preventing or suppressing the spread of flames caused by thermal runaway in a battery used for supplying charging power to mobile phones, etc.

[0018] In particular, the present invention also aims to provide a battery storage pouch having a fire spread prevention function that prevents or suppresses the spread of high-temperature flames to the outside by equipping it with a fire extinguishing pad that discharges nitrogen-based gas in the event of thermal runaway of the battery.

[0019] In addition, the present invention also aims to provide a battery storage pouch capable of blocking the inflow of external oxygen and improving flame suppression efficiency by employing a gas circulation structure that allows nitrogen-based gas generated as the fire extinguishing pad carbonizes due to thermal runaway of the battery to circulate toward the battery. means of solving the problem

[0021] To solve such technical problems, the present invention;

[0022] A battery storage pouch having a fire spread prevention function is provided, characterized by including a main body having a storage space for storing a battery and an entrance, and a fire extinguishing pad mounted on the main body that discharges nitrogen-based gas in the event of thermal runaway of the battery.

[0023] At this time, the main body is composed of an inner layer forming a storage space and an outer layer surrounding the inner layer, and a pad insertion space is formed between the inner layer and the outer layer to provide a fire extinguishing pad, wherein the fire extinguishing pad is inserted therein.

[0024] In addition, the surface of the inner lining is characterized by having a plurality of gas passage holes formed therein so that nitrogen-based gas generated when the melamine resin of the fire extinguishing pad melts can move and circulate into the storage space of the main body where the battery is stored.

[0025] In addition, the inner surface of the main body is further provided with a mesh net that functions as a spacer to prevent direct contact between the inner surface and the battery stored in the storage space.

[0027] In addition, the entrance formed in the main body is provided with an opening and closing means, the main body is integrally provided with a cover that conceals the entrance, and a magnetic button is provided between the cover and the main body.

[0028] In addition, the above-mentioned fire extinguishing pad is characterized by containing melamine resin that generates nitrogen-based gas during the melting process in the event of thermal runaway of the battery.

[0029] The fire extinguishing pad is characterized by comprising a base layer, a buffer layer formed on one side of the base layer and containing a melamine resin that generates nitrogen-based gas to block oxygen due to an expansion effect when a fire occurs, and a coated layer formed on one side of the buffer layer to prevent the adhesion of contaminants.

[0030] At this time, the other side of the base layer is further characterized by having an adhesive layer formed thereon that can be attached to the inner surface of the outer shell of the main body. Effects of the invention

[0032] According to the present invention, the following effects are achieved.

[0033] First, when thermal runaway occurs, nitrogen-based gas (including N2) released from the fire extinguishing pad flows into and circulates within the storage space, thereby reducing the oxygen concentration and suppressing the spread of flames.

[0034] Second, the external transfer of high-temperature flames and radiant heat is blocked by the porous carbonized insulation layer formed as the fire extinguishing pad expands and carbonizes due to heat, thereby preventing the spread of secondary fire.

[0035] Third, the gas flow passage is maintained by the combined structure of gas passages and flame-retardant mesh, ensuring continuous circulation of extinguishing gas, and enabling the suppression of fire spread in a passive manner without the use of separate detection or extinguishing devices. Brief explanation of the drawing

[0037] FIG. 1 is a perspective view showing the lid open state of a battery storage pouch having a fire spread prevention function according to the present invention. FIG. 2 is a perspective view illustrating the state of storing a battery in a battery storage pouch having a fire spread prevention function according to the present invention. FIG. 3 is a drawing showing the interior of a battery storage pouch having a fire spread prevention function according to the present invention. FIG. 4 is a cross-sectional view of a battery storage pouch having a fire spread prevention function according to the present invention. FIG. 5 is a perspective view illustrating another embodiment of a battery storage pouch having a fire spread prevention function according to the present invention. FIG. 6 is a cross-sectional view illustrating the battery storage pouch of FIG. 5. Specific details for implementing the invention

[0038] The features of the battery storage pouch having a fire spread prevention function according to the present invention can be understood through the embodiments described in detail below with reference to the attached drawings.

[0039] Meanwhile, in describing the embodiments, detailed descriptions of components that are widely known and used in technical fields to which the present invention belongs or not belong will be omitted. This is intended to omit unnecessary explanations and to more clearly convey the gist of the present invention.

[0041] According to FIGS. 1 to 4, a battery storage pouch (100) having a fire spread prevention function according to the present invention comprises a main body (110) having a storage space (111) formed therein for storing a battery (B) and an entrance / exit port (112) formed on one side for moving the battery (B) into and out of the storage space (111), and a fire extinguishing pad (120) mounted on the main body (110) that suppresses the generation and spread of flames by releasing a nitrogen-based gas (including N2) when the battery (B) undergoes thermal runaway and reducing the oxygen concentration in the storage space (111).

[0042] At this time, the main body (110) is composed of an inner layer (113) that forms a storage space (111) and an outer layer (114) that surrounds the inner layer (113), and a fire extinguishing pad (120) is provided between the inner layer (113) and the outer layer (114) to discharge nitrogen-based gas when the battery (B) undergoes thermal runaway.

[0043] In addition, the main body (110) may be further provided with a cover (130) that covers the entrance (112).

[0044] The battery storage pouch (100) having a fire spread prevention function according to the present invention can be manufactured in various sizes and designs so as to be used for storing batteries (B) that can be used in various fields, such as mobile phones like smartphones, as well as electric scooters and drones.

[0046] Hereinafter, each component of the present invention will be described in detail.

[0047] First, the main body (110) has a storage space (111) and an entrance (112) formed inside where a battery (B) is stored.

[0048] At this time, the entrance (112) formed on one side of the main body (110) is equipped with an opening / closing means (112a), such as a zipper, so that the entrance (112) can be opened or closed.

[0049] The inner skin (113) and outer skin (114) of the main body (110) are made of one of various materials such as aramid fiber, ceramic fiber mat / fabric, silica fiber, aerogel composite sheet, etc., which exhibit one or more of flame retardant, flame-retardant, and fire-resistant performance during battery thermal runaway, or are made of a composite structure combining two or more.

[0050] Of course, the inner layer (113) and outer layer (114) may also be composed of flame-retardant fabrics, etc., which are chemically and physically treated with a flame retardant (flame retardant) on general fibers such as polyester, cotton, and acrylic so that they do not burn easily or delay the spread of flames when exposed to flames, and it is obvious that such changes in material are all within the scope of the present invention.

[0051] In addition, the materials of the inner casing (113) and the outer casing (114) can be selected in various ways depending on the type and capacity of the battery being stored.

[0052] The inner lining (113) constituting the main body (110) is formed of ceramic fiber fabric or silica fiber to perform a direct blocking function against high-temperature flames and molten particles generated during thermal runaway, and the outer lining (114) is formed of aramid fiber or glass fiber fabric to provide mechanical strength and flame retardancy.

[0054] The inner layer (113) and outer layer (114) constituting the main body (110) may be formed with a structure in which only the edges are joined by sewing or the like, and a pad insertion space (115) is formed between the inner layer (113) and the outer layer (114) to which a fire extinguishing pad (120) is provided, and a fire extinguishing pad (120) containing melamine resin is inserted.

[0055] Here, when melamine resin is heated, it melts from a solid state to a liquid state. During this process, due to the endothermic reaction of melamine, the melamine absorbs the surrounding heat that is about to ignite as it melts, thereby reducing the energy required for fire spread. Immediately after melting, pyrolysis occurs in which chemical bonds are broken, and nitrogen atoms trapped within the melamine molecular structure (C3H6N6) combine to generate nitrogenous gases (including N2), forming a char layer that acts as a foam-like insulating layer. The nitrogenous gases generated in this case lower the oxygen concentration around the flame, creating an environment where it is difficult for the flame to spread. Additionally, the melted resin expands physically, forming a physical foam insulating wall.

[0057] In the present invention, the effect of suppressing flame and fire spread through the formation of a charred layer (Char) is utilized in the process where nitrogen-based gas is generated during the melting of the melamine resin during thermal runaway of the battery (B).

[0058] In particular, a plurality of gas passage holes (113a) are formed through the surface of the inner lining (113) constituting the main body (110) so that the nitrogen-based gas generated when the melamine resin of the fire extinguishing pad (120) melts can smoothly move and circulate to the storage space (111) of the main body (110) where the battery (B) is stored.

[0059] At this time, the gas transfer hole (113a) is preferably formed on the outer edge of the fire extinguishing pad (120) inserted into the pad insertion space (115), but is not limited thereto and may be formed evenly on the surface of the inner lining (113).

[0060] In this way, by forming the gas transfer hole (113a) only in the inner lining (113) of the main body, the external oxygen is primarily blocked from flowing into the storage space (111) of the main body (110), while the nitrogen-based gas generated by the melting of the melamine resin of the fire extinguishing pad (120) during the thermal runaway of the battery (B) is discharged into the storage space (111) of the main body (110) through some of the gas transfer holes (113a) and flows into the pad insertion space (115) through other gas transfer holes (113a), thereby suppressing the flame of the battery (B).

[0061] The gas passage hole (113a) in the inner lining (113) of the main body (110) may be formed in an elliptical shape in addition to a circular shape, or in various other shapes such as a triangle or a square, but it is obvious that all of these are also within the scope of the present invention.

[0063] Meanwhile, the fire extinguishing pad (120) is manufactured by containing a component that generates nitrogen-based gas during the melting process when the battery (B) undergoes thermal runaway, and is composed of a base layer (121), a safety buffer layer (122) formed on one side of the base layer (121) that blocks oxygen due to an expansion effect when a fire occurs, and a coated layer (123) formed on one side of the safety buffer layer (122) that prevents the adhesion of contaminants.

[0064] In addition, an adhesive layer (124) that can be attached to the inner surface of the outer shell (114) of the main body (110) may be further formed on the other side of the base layer (121).

[0065] At this time, the base layer (121) is made of various materials such as non-combustible, semi-combustible, or flame-retardant fabric that is not electrically conductive, and as an example, glass fiber fabric (glass fabric), silica fabric, aramid fabric, flame-retardant fabric, etc., may be used. This base layer (121) may be formed with various thicknesses depending on the size of the battery pack, the number of cells, and the size of the cells, and as an example, it may be formed with a thickness of 0.3 to 5 mm.

[0066] And the above buffer layer (122) includes a polymer composition for a buffering function and a fire extinguishing agent composition for delaying fire spread, and in the event of a fire, it blocks oxygen due to an expansion effect to delay and prevent fire in the battery pack.

[0067] To explain more specifically, the mixed composition forming the buffer layer (122) comprises, based on 100 parts by weight of binder, 5 to 20 parts by weight of a carbon-forming agent, 3 to 7 parts by weight of a foaming agent, 20 to 40 parts by weight of an acid catalyst, 3 to 7 parts by weight of a fire extinguishing agent, and 7 to 13 parts by weight of a reinforcing agent.

[0068] At this time, the binder is composed of melamine resin, silicone, and a curing agent in a weight ratio of 25 to 30: 30 to 40: 30 to 40, preferably in a weight ratio of 30: 35: 35. The binder is a resin and is one of the main components that form the coating film of the buffer layer (122). It determines the physical properties of the coating film and performs roles such as forming a carbonized layer in the event of a fire and fixing other main components of the fire-resistant paint. The curing agent crosslinks with the resin to form a coating film and improves fire resistance performance by controlling the crosslinking density, etc. Of course, the physical properties of the coating film can be determined depending on the selection of the curing agent.

[0069] In addition, the above carbide-forming agent uses pentaerythritol with a size of 30 to 40 μm, and among pentaerythritol-based raw materials, mono-pentaerythritol, di-pentaerythritol, tri-pentaerythritol, polyurethane, phenol formaldehyde resin, etc. are selected and used. This carbide-forming agent has thermal stability due to its carbon skeleton, and when exposed to a heat source, it reacts with an acid catalyst to form a carbide and plays a role in forming a heat barrier through the carbide, and it is effective to use it together with melamine.

[0071] In addition, it is preferable to use a melamine resin with a size of 50 to 80 μm as the foaming agent. In the case of such melamine, the foam size and the shape of the carbonized material are more stable compared to other raw materials, and it is particularly superior in terms of the density of the carbonized layer. Here, the foaming agent is one of the key components of the foamed fire-resistant paint and plays a role in maximizing the heat insulation effect of the coating film by causing volume expansion of the carbonized layer.

[0072] In the case of such blowing agents, nitrogen-based compounds are primarily used. Representative blowing agents include melamine, chlorinated paraffin, and urea, and melamine exhibits optimal performance as a high-temperature reactive blowing agent.

[0073] Furthermore, the aforementioned acid catalyst uses a silane-treated APP. This acid catalyst reacts with a carbide-forming agent to form carbides.

[0074] In addition, the above-mentioned fire extinguishing agent is selected from liquid flame retardants such as sodium bicarbonate, ammonium phosphate, and halogen-based agents.

[0075] The above liquid flame retardant can lower the viscosity of high-viscosity fire-resistant paint, and it is preferable to use it in a small amount, similar to an additive, to enhance the fire resistance of the carbonized layer.

[0077] In addition, it is preferable to use ceramic fibers as the reinforcing agent (or reinforcing material). Such reinforcing agents play a role in preventing cracks in the carbonized layer and reinforcing the coating film of the carbonized layer to improve fire resistance performance against heat. In particular, when the reinforcing agent is used in foamed fire-resistant paint, the fibers can reduce wrinkling in the carbonized layer, prevent cracks in the carbonized layer, increase the thickness of the coating film that can be applied in a single application, and improve fire resistance performance against heat by reinforcing the coating film of the carbonized layer. In addition to ceramic fibers, various other materials such as steel fibers, carbon fibers, and silica fibers may be used as the reinforcing agent.

[0078] The buffer layer (122) is preferably composed of 5 to 20 weight% of a carbon-forming agent, 5 weight% of a foaming agent, 20 to 40 weight% of an acid catalyst, 5 weight% of a liquid flame retardant as a fire extinguishing agent, and 10 weight% of a ceramic fiber as a reinforcing agent, based on 100 weight% of a binder composed of melamine resin, silicone, and a curing agent in a weight ratio of 30:35:35.

[0079] Of course, the mixture forming the buffer layer (122) may include a small amount of pigment as needed, and the pigment may be added in an amount of 0.01 to 40 weight% based on 100 weight% of the binder. At this time, the pigment may be an inorganic pigment or an organic pigment, and may be used for purposes such as coloring, reinforcement, or weight increase. In particular, the inorganic pigment may be selectively used as a non-conductive material with excellent fire resistance and thermal insulation properties, such as alumina, vermiculite, perlite, gypsum, magnesium oxide, or magnesium hydroxide, and the organic pigment may be a thickener or a surfactant. That is, the present invention may use inorganic pigments and organic pigments together as pigments, or may selectively use inorganic pigments or organic pigments as needed.

[0080] In addition, the buffer layer (122) can be formed with various thicknesses, for example, with a thickness of 1 to 5 mm.

[0082] Meanwhile, the coated layer (123) is formed on one side of the buffer layer (122) to prevent the adhesion of contaminants and to block the inflow of oxygen in case of fire, thereby delaying and preventing fire. It is made of various materials such as non-combustible, semi-combustible, and flame-retardant materials that are non-electrically conductive, such as fabric, just like the base layer (121). Examples include glass fiber fabric, silica fabric, aramid fabric, and flame-retardant fabric.

[0083] The coated layer (123) can be formed with various thicknesses, for example, with a thickness of 0.3 to 5 mm.

[0084] In addition, the buffer layer (122) can be formed as a multi-layer structure of one or more layers. For example, if the buffer layer (122) is formed as a multi-layer structure of two or more layers, a stepwise fire delay can be achieved.

[0086] In addition, the main body (110) may be integrally provided with a cover (130) that covers the entrance (112), and a magnetic button (117) may be provided between the cover (130) and the main body (110) to allow for attachment and detachment.

[0087] For example, the female button (117a) with a built-in magnet of the magnetic button (117) is fixed to the surface of the main body (110), and the male button (117b) made of iron that sticks to the magnet is fixed to the cover (130), so that when the entrance is covered with the cover (130) and the main body is pressed against the surface, the male button (117b) sticks to the female button (117a).

[0088] Of course, in addition to the magnetic button (117) mentioned above, Velcro tape, snap buttons, etc. can be substituted, and such a replacement of an equivalent part is also within the scope of the present invention.

[0090] And FIGS. 5 and 6 are drawings illustrating a battery storage pouch having a fire spread prevention function according to another embodiment of the present invention.

[0091] According to this, a mesh net (116) is further provided on the surface of the inner lining (113) of the main body (110) to function as a spacer that separates the inner lining (113) from the battery (B) stored in the storage space (111) to prevent direct contact. This mesh net (116) is made of synthetic fibers such as PP (polypropylene), polyester, and nylon, and is coated with glass fiber or PVC to withstand high temperatures, thereby providing a flame-retardant function.

[0092] The mesh net (116) is structured such that a plurality of holes are formed at regular intervals and is positioned toward the storage space (111), thereby allowing the battery (B) to come into contact with it. Accordingly, the mesh net (116) prevents the battery (B) from blocking the gas passage hole (113a) of the inner lining (113), thereby facilitating the movement and circulation of nitrogen-based gas.

[0094] As explained above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features.

[0095] Therefore, all embodiments described above should be understood as exemplary and not limiting.

[0096] The scope of the present invention should be interpreted as including all modified or altered forms derived from the meaning and scope of the claims set forth below and their equivalents, rather than from the detailed description above. Explanation of the symbols

[0097] 100: Pouch 110: Main body 111: Storage space 112: Entrance 113: Inner layer 113a: Gas passage 114: Outer shell 115: Pad insertion space 116: Mesh net 120: Fire extinguisher pad 121: Base Layer 122: Buffer Layer 123: Coated layer 124: Adhesive layer 130: Cover B: Battery

Claims

Claim 1 The device comprises a main body (110) having a storage space (111) for storing a battery (B) and an entrance (112), and a fire extinguishing pad (120) mounted on the main body (110) to discharge nitrogen-based gas when the battery (B) undergoes thermal runaway; the main body (110) is composed of an inner lining (113) forming a storage space (111) and an outer lining (114) surrounding the inner lining (113), and a pad insertion space (115) is formed between the inner lining (113) and the outer lining (114) to which the fire extinguishing pad (120) is provided, into which the fire extinguishing pad (120) is inserted; a plurality of gas transfer holes (113a) are formed on the surface of the inner lining (113) so that nitrogen-based gas generated when the melamine resin of the fire extinguishing pad (120) melts can move and circulate to the storage space (111) of the main body (110) where the battery (B) is stored; A battery storage pouch having a fire spread prevention function, characterized in that the surface of the inner lining (113) of the main body (110) is further provided with a mesh net (116) that functions as a spacer to prevent direct contact between the inner lining (113) and the battery (B) stored in the storage space (111). Claim 2 A battery storage pouch having a fire spread prevention function, characterized in that, in the first paragraph, the entrance (112) formed in the main body (110) is provided with an opening / closing means (112a), the main body (110) is integrally provided with a cover (130) that covers the entrance (112), and a magnetic button (117) is provided between the cover (130) and the main body (110). Claim 3 A battery storage pouch having a fire spread prevention function, wherein the fire extinguishing pad (120) comprises a melamine resin that generates nitrogen-based gas during the melting process when the battery (B) undergoes thermal runaway. Claim 4 A battery storage pouch having a fire spread prevention function, characterized in that, in claim 3, the fire extinguishing pad (120) comprises a base layer (121), a buffer layer (122) formed on one side of the base layer (121) and containing a melamine resin that generates nitrogen-based gas to block oxygen due to an expansion effect when a fire occurs, and a coated layer (123) formed on one side of the buffer layer (122) to prevent the adhesion of contaminants. Claim 5 A battery storage pouch having a fire spread prevention function, characterized in that, in claim 4, an adhesive layer (124) attachable to the inner surface of the outer shell (114) of the main body (110) is further formed on the other side of the base layer (121). Claim 6 delete Claim 7 delete Claim 8 delete

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