Fire-extinguishing sheet, secondary battery cell comprising same, and battery module comprising same

Abstract

A secondary battery cell provided with a fire-extinguishing sheet according to an aspect of the present invention may comprise: an electrode; a pouch which forms a pocket in which the electrode and electrolyte are accommodated, surrounds the electrode to protect the electrode from the outside, and comprises a first outer skin layer forming a first surface of the pocket and a second outer skin layer forming a second surface of the pocket, wherein the first outer skin layer and the second outer skin layer are bonded to each other at the outer boundary of the pocket and form a sealing portion; a lead tab which extends from the electrode to the outside of the pouch; and a fire-extinguishing sheet which is located in the pocket of the pouch on both surfaces of one of the lead tab and the electrode at the position where the lead tab and the electrode are bonded, and has a fire-extinguishing material encapsulated therein.

Description

Digestive sheet, secondary battery cell equipped with the same, and battery module including the same

[0001] The present invention relates to a fire extinguishing sheet, a secondary battery cell equipped with the same, and a battery module including the same. More specifically, it relates to a fire extinguishing sheet capable of extinguishing a battery fire at an early stage, a secondary battery cell equipped with the same, and a battery module including the same.

[0002] Recently, due to environmental issues, the development of electric vehicles to replace conventional internal combustion engines is accelerating. In addition, with the advancement of various IT devices, the development of portable electronic devices such as laptops, mobile phones, and watches is also accelerating.

[0003] These electric vehicles and portable electronic devices all use electricity as a power source, and batteries, including secondary batteries, can be cited as a representative power source for electrical energy.

[0004] These rechargeable secondary batteries are a key component of electric vehicles and portable electronic devices.

[0005] These secondary batteries can be seen as comprising battery cells, battery modules in which the battery cells are assembled, and battery packs in which the battery modules are assembled, but there is a risk of fire occurring due to various reasons such as short circuits, overcharging, or over-discharging between the battery cells and battery modules.

[0006] Generally, a battery consists of electrodes and an outer casing surrounding the electrodes. It is reported that when a fire occurs, the internal electrolyte leaks from the outer casing, and combustion begins in the leaked electrolyte.

[0007] In particular, since secondary battery fires are difficult to start due to their characteristics, early extinguishing is crucial, and it is also important to delay the spread of fire to secure evacuation time when it first occurs.

[0008] Furthermore, in the case of electric vehicles, devices or structures for initial fire suppression or fire propagation delay must be installed within the vehicle's structure; however, the installation of such devices leads to a problem where the vehicle's interior becomes cramped or the space within the battery pack is reduced, resulting in a decrease in battery capacity.

[0009] In the case of small portable electronic devices, there is no space within the device to install devices for initial fire suppression or fire propagation delay in the event of a fire, so a solution to this problem is currently required.

[0010] The present invention aims to solve the above-mentioned problems, and the objective of the present invention is to provide a fire extinguishing sheet capable of extinguishing a fire in its early stages or delaying the spread of fire without occupying volume, a secondary battery cell equipped with the same, and a battery module including the same.

[0011] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0012] According to one aspect of the present invention, a secondary battery cell having a fire extinguishing sheet is provided, comprising: an electrode; a pouch that forms a pocket in which the electrode and an electrolyte are received, surrounds the electrode to protect it from the outside, and includes a first outer layer forming a first surface of the pocket and a second outer layer forming a second surface of the pocket, wherein the first outer layer and the second outer layer form a sealing portion joined together at the outer edge of the pocket; a lead tab extending from the electrode to the outside of the pouch; and a fire extinguishing sheet enclosed therein, which is positioned on one surface of either the lead tab or the electrode at a location where the lead tab and the electrode are joined within the pocket of the pouch, and which contains a fire extinguishing substance.

[0013] The sealing portion comprises a first sealing portion in which the first outer layer and the second outer layer are joined, and a second sealing portion in which the lead tab and the first outer layer and the lead tab and the second outer layer are joined, and the fire extinguishing sheet may be located further inside the pocket than the second sealing portion.

[0014] An insulating film may be positioned between the above-mentioned fire extinguishing sheet and the above-mentioned lead tab.

[0015] The above fire extinguishing sheet may have a fire extinguishing substance enclosed between two films.

[0016] The fire extinguishing sheet may include a first film body and a second film body, at least the edges of which are fused and sealed together; and a fire extinguishing material enclosed within the fused interior of the first film body and the second film body.

[0017] The first film body and the second film body may be made of PP (Polypropylene) or PPA (polyphthalamide).

[0018] The first film body and the second film body may include a first layer and a third layer made of PP (Polypropylene) or PPA (polyphthalamide); and a second layer formed between the first layer and the third layer and formed of PEN (Polyethylene Naphthalate) material.

[0019] The layer that is mutually fused between the first film body and the second film body may be of the same material.

[0020] Meanwhile, according to another aspect of the present invention, a fire extinguishing sheet is provided, comprising: a first film body; a second film body that overlaps the first film body and has at least a border portion sealed with the first film body; and a fire extinguishing material enclosed within the fused first film body and the second film body.

[0021] The first film body and the second film body may be made of PP (Polypropylene) or PPA (polyphthalamide).

[0022] The first film body and the second film body may include a first layer and a third layer made of PP (Polypropylene) or PPA (polyphthalamide); and a second layer formed between the first layer and the third layer and formed of PEN (Polyethylene Naphthalate) material.

[0023] The layer that is mutually fused between the first film body and the second film body may be of the same material.

[0024] The portion where the first film body and the second film body are fused may be thinner than the portion where the fire extinguishing material is enclosed.

[0025] Meanwhile, according to another aspect of the present invention, a battery module is provided comprising: a casing for housing a secondary battery cell equipped with a plurality of fire extinguishing sheets; and a flame blocker protruding from the inner wall surface of the casing so as to be positioned between the lead tabs of the battery cell, thereby blocking the propagation of flames generated during a fire in the battery cell to adjacent battery cells, wherein the flame blocker comprises a fire extinguishing material.

[0026] The flame blocker above can be molded in a state where synthetic resin and fire extinguishing material are mixed.

[0027] The flame blocker may include a fire extinguishing bag containing a fire extinguishing substance; and a mold into which the fire extinguishing bag is inserted and injected.

[0028] The above-mentioned extinguishing bag may include an outer shell; and a extinguishing substance filled inside the outer shell.

[0029] The above outer shell may include any one of PP (Polypropylene), PPA (polyphthalamide), or PEN (Polyethylene Naphthalate).

[0030] According to the above configuration, the fire extinguishing sheet according to the present invention, the secondary battery cell equipped with the same, and the battery module including the same have the effect of extinguishing a fire in the early stages or delaying the propagation of a fire without complex configuration when a fire occurs in the secondary battery cell.

[0031] In addition, since a fire extinguishing sheet is provided within the secondary battery cell, the fire extinguishing agent component of the sheet can react with the flammable gas before it comes into contact with oxygen, and the fire extinguishing agent component is sprayed together with the gas ejection, thereby preventing the occurrence of a fire in the surrounding area outside the cell.

[0032] In addition, even if a fire occurs in any one of the multiple battery cells equipped in the battery module, the flames generated can be extinguished by the flame blocker, thereby blocking or delaying the spread of the fire to adjacent battery cells.

[0033] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0034] FIG. 1 is a drawing illustrating a secondary battery cell formed with a pouch-shaped digestion sheet according to one embodiment of the present invention.

[0035] FIG. 2 is a drawing showing the opening of a pouch of a secondary battery cell equipped with a pouch-shaped fire extinguishing sheet according to one embodiment of the present invention.

[0036] FIG. 3 is a plan view of a secondary battery cell equipped with a pouch-shaped digestion sheet according to one embodiment of the present invention.

[0037] FIG. 4 is a cross-sectional view of a secondary battery cell equipped with a pouch-shaped digestion sheet according to one embodiment of the present invention.

[0038] FIG. 5 is a cross-sectional view illustrating one form of a fire extinguishing sheet provided inside a secondary battery cell equipped with a pouch-shaped fire extinguishing sheet according to one embodiment of the present invention.

[0039] FIG. 6 is a cross-sectional view illustrating another form of a fire extinguishing sheet provided inside a secondary battery cell equipped with a pouch-shaped fire extinguishing sheet according to one embodiment of the present invention.

[0040] FIG. 7 is a flowchart illustrating a method for manufacturing a digestive sheet according to another embodiment of the present invention.

[0041] FIG. 8 is a diagram illustrating the manufacturing process of a digestive sheet according to another embodiment of the present invention.

[0042] FIG. 9 is a drawing illustrating a battery module having pouch-type battery cells arranged according to another embodiment of the present invention.

[0043] FIG. 10 is a drawing illustrating a heat transfer capsule disposed in a battery module according to another embodiment of the present invention.

[0044] FIG. 11 is a drawing illustrating a part of a battery module equipped with a flame blocker according to another embodiment of the present invention.

[0045] FIG. 12 is a drawing illustrating a form in which a fire extinguishing substance is mixed into a flame blocker according to another embodiment of the present invention.

[0046] FIG. 13 is a drawing illustrating a form in which a fire extinguishing bag containing a fire extinguishing substance is inserted and injected into a flame blocker according to another embodiment of the present invention.

[0047] FIG. 14 is a drawing showing a fire extinguishing bag containing the fire extinguishing substance of FIG. 13.

[0048] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0049] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0050] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0051] In this specification, terms such as “comprising” or “having” are intended to describe the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0052] The statement that a component is "in front," "rear," "upper," or "lower" of another component includes, unless there are special circumstances, not only being positioned "in front," "rear," "upper," or "lower" in direct contact with the other component, but also cases where another component is positioned in between. Furthermore, the statement that a component is "connected" to another component includes, unless there are special circumstances, not only being directly connected to each other, but also being indirectly connected to each other.

[0053] Hereinafter, a secondary battery cell equipped with a digestion sheet according to one embodiment of the present invention is described with reference to the drawings.

[0054] A secondary battery cell (100) equipped with a digestion sheet according to the present embodiment may include an electrode (110), a pouch (121), and a lead tab (140), as shown in FIGS. 1 and 2.

[0055] The above electrode (110) can have a positive electrode and a negative electrode stacked in a rectangular shape.

[0056] Additionally, the pouch (121) can serve as an outer shell that encloses the electrode (110). That is, the pouch (121) forms a receiving space in which the electrode (110) is received, and can serve as an outer shell that encloses the electrode (110) to protect it from the outside.

[0057] The above pouch (121) may be made of a film or the like, which has a synthetic resin such as polyethylene terephthalate (PET) coated on the surface of a metal material such as aluminum.

[0058] The above pouch (121) has a pocket (122) formed therein for accommodating the electrode (110) and an electrolyte (not shown), and surrounds the electrode (110) to protect the electrode (110) and the electrolyte from the outside and prevents the electrolyte inside from leaking out.

[0059] The above pouch (121) includes a first outer layer (125) forming a first surface of the pocket (122) and a second outer layer (126) forming a second surface of the pocket (122), and the first outer layer (125) and the second outer layer (126) may form a sealing portion (130) joined together at the outer edge of the pocket (122).

[0060] The pocket (122) may be formed only in the first outer layer (125) or may be formed in both the first outer layer (125) and the second outer layer (126).

[0061] Additionally, the lead tab (140) may be formed to extend from the electrode (110) to the outside of the pouch (121) in order to electrically connect the electrode (110) to the outside.

[0062] The above lead tab (140) may be coated with a film of a synthetic resin material, such as polypropylene (PP), on the surface of an electrically conductive metal. This is to further improve the adhesion between the dissimilar materials of the metal and the pouch (121).

[0063] The lead tab (140) may be welded to the electrode (110) and extend from the electrode (110) to the outside of the pouch (121). Additionally, the electrode (110) may have a plurality of positive and negative electrodes stacked alternately, and a separator (114) may be placed between each stack of positive and negative electrodes.

[0064] Meanwhile, the pocket (122) may be formed by being recessed into the first outer layer (125) to form a space in which the electrode (110) and the electrolyte are accommodated.

[0065] The pocket (122) may be stepped with respect to the sealing portion (130) and may include a flat portion (123) that is stepped with respect to the sealing portion (130) and an inclined portion (124) that is inclinedly connected from the flat portion (123) to the sealing portion (130).

[0066] The sealing portion (130) may be extended in a planar direction perpendicular to the stepped direction of the pocket (122).

[0067] Additionally, the sealing portion (130) may include a first sealing portion (132) in which the first outer layer (125) and the second outer layer (126) are fused and joined, and a second sealing portion (134) in which the lead tab (140), the first outer layer (125), and the lead tab (140) and the second outer layer (126) are joined.

[0068] At this time, the second sealing part (134) can be bonded by fusing the films of the first outer layer (125) and the second outer layer (126) with the synthetic resin film of the lead tab (140).

[0069]

[0070] Meanwhile, a fire extinguishing sheet (150) may be provided. As shown in FIG. 4, the fire extinguishing sheet (150) is a sheet containing a fire extinguishing substance (153) and may be attached to one or both sides of either the lead tab (140) or the electrode (110) at the location where the lead tab (140) and the electrode (110) are joined within the pocket (122) of the pouch (121).

[0071] The above-mentioned extinguishing material (153) preferably has a melting point of 100°C or higher for the extinguishing composition that generates the extinguishing material through the high-temperature decomposition to ensure functional stability of the extinguishing composition at room temperature and to facilitate long-term storage, and is a brominated extinguishing material such as tetrabromobisphenol A, tetrabromobisphenol A ether, 1,2-bis(tribromophenoxy)ethane, 1,2-bis(tetrabromophthalamide)ethane, 4-bromophthalic acid dimethyl ester, disodium tetrabromophthalate, decabromodiphenyl ether, tetradecabromo-1,4-diphenoxybenzene, 1,2-bis(pentabromophenyl)ethane, bromotrimethylphenyl indane (BTMPI), pentabromobenzyl acrylate, hexabromobenzene, pentabromotoluene, hexabromocyclododecane, Ethylene-bis(5,6-dibromonobonan-2,3-dicarboxymide), pentabromochlorocyclohexane, styrene bromide polymer, tetrabromobisphenol A carbonate ester oligomer, polypentabromobenzyl acrylate, polydibromophenylene ether; chlorinated extinguishing materials such as Dechlorane Plus, chlorenedic acid anhydride, perchloropentacyclodecane, tetrachlorobisphenol A, polychlorinated olefin, chlorinated polyvinyl chloride, vinyl chloride-vinylidene chloride copolymer, chlorinated polyethylene; Organophosphorus extinguishing materials 1-oxo-4-hydroxymethyl-2,6,7-trioxahetero-1-phosphabicyclo[2,2,2]octane, 2,2-dimethyl-1,3-propylene glycol-bis(neopentyl glycol)bisphosphonate, 9,10-dihydrogen-9-oxahetero-10-phosphafenantrene-10 oxide, bis(4-carboxyphenyl)phenyl phosphorus oxide, bis(4-hydroxyphenol)phenyl phosphorus oxide, oligomeric phenyl(diphenylsulfone)phosphonate;Phosphorus-halogenated fire extinguishing materials, tri(2,2-bis(bromomethyl)-3-bromopropyl) phosphate ester, tri(2-bromophenyl) phosphate ester, 3,9-bis(tribromophenyl)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-dioxiumdecane, 3,9-bis(pentabromozyl)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-dioxiumdecane, 1-oxo-4-tribromophenyl-2,6,7-trioxane-1-phosphahetero-bicyclo[2,2,2]octane, p-phenylene(2,4,6-tribromophenyl)bisphosphonate, 2,2-bis(chloromethyl)-1,3-propylene glycol-bis(neopentyl glycol)bisphosphonate, 2,9-bis(tribromopro)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-dioxiumdecane;Nitrogen-based and phosphorus-nitrogen-based fire extinguishing materials include melamine cyanurate, melamine orthophosphate, bismelamine orthophosphate, melamine polyphosphate, melamine borate, melamine octamolybdate, tris(hydroxyethyl)isocyanurate, 2,4-diamino-6-(3,3,3-trichloropropyl)-1,3,5-triazine, 2,4-bis(N-hydroxymethylamino)-6-(3,3,3-trichloropropyl-1,3,5-triazine), bisguanidine hydrogen phosphate, dihydrogen guanidine phosphate, guanidine carbonate, guanidine aminosulfonic acid, urea, dihydrogen urea phosphate, dicyandiamide, and bis(2,6,7-trioxyhetero-1-phosphahetero-bicyclo[2,2,2]octan-1-oxo-4-methyl). Hydroxyl phosphate ester melamine, 3,9-dihydroxy-3,9-deoxy-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]undecane-3,9-bismellamin, 1,2-bis(2-oxo-5,5-dimethyl-1,3-dioxahetero-2-phosphaheterohexyl-2-amino)ethane, N,N'-bis(2-oxo-5,5-dimethyl-1,3-deoxyhetero-2-phosphaheterohexyl)-2,2'-meta-phenylenediamine, tri(2-oxo-5,5-dimethyl-1,3-deoxyhetero-2-heterocyclohexyl-2-methyl)amine, phenoxycyclophosphazene, inorganic extinguishing material polyammonium phosphate, diammonium hydrogen phosphate, It may be ammonium dihydrogen phosphate, zinc phosphate, aluminum phosphate, boron phosphate, antimony trioxide, aluminum hydroxide, magnesium hydroxide, magnesium magnesite, basic aluminum hydroxide, zinc borate, barium metaborate, zinc oxide, zinc sulfide, zinc sulfate heptahydrate, aluminum borate single crystal, ammonium octamolybdate, hexaammonium molybdate, zinc tartrate, tin oxide, ferrocene, iron acetone, ferric oxide, iron tetroxide, sodium tungstate, potassium hexafluorotitanate, potassium hexafluorozirconate, titanium dioxide, calcium carbonate, or barium sulfate.

[0072] And other chemical substances capable of decomposing extinguishing substances with a decomposition temperature of 100℃ or higher, such as sodium bicarbonate, potassium bicarbonate, cobalt carbonate, zinc carbonate, basic zinc carbonate, manganese carbonate, ferrous carbonate, strontium carbonate, sodium potassium carbonate hexahydrate, calcium carbonate, dolomite, basic copper carbonate, zirconium carbonate, beryllium carbonate, sodium sesquicarbonate, cerium carbonate, lanthanum carbonate, guanidine carbonate, lithium carbonate, scandium carbonate, vanadium carbonate, chromium carbonate, nickel carbonate, yttrium carbonate, silver carbonate, preseodymium carbonate, neodymium carbonate, samarium carbonate, europium carbonate, gadolinium carbonate, terbium carbonate, dysprosium carbonate, holmium carbonate, erbium carbonate, thulium carbonate, hol-ytterbium carbonate, lutetium carbonate, aluminum diacetate, calcium acetate, sodium hydrogen tartrate, sodium acetate, potassium acetate, zinc acetate, Strontium acetate, nickel acetate, copper acetate, sodium oxalate, potassium oxalate, ammonium oxalate, nickel oxalate, manganese(II) oxalate dihydrate, iron nitride, sodium nitrate, magnesium nitrate, potassium nitrate, zirconium nitrate, calcium dihydrogen phosphate, sodium dihydrogen phosphate, sodium dihydrogen phosphate dihydrate, potassium dihydrogen phosphate, aluminum dihydrogen phosphate, ammonium dihydrogen phosphate, zinc dihydrogen phosphate, manganese dihydrogen phosphate, magnesium dihydrogen phosphate, disodium hydrogen phosphate, diammonium hydrogen phosphate, calcium hydrogen phosphate, magnesium hydrogen phosphate, ammonium phosphate, magnesium ammonium phosphate, ammonium polyphosphate, potassium metaphosphate, potassium tripolyphosphate, potassium trimephosphate, hypoammonium phosphate, ammonium orthophosphite Dihydrogen phosphate, manganese phosphate, dizinc hydrogen phosphate, dimanganous hydrogen phosphate, guanidine phosphate, melamine phosphate, urea phosphate, strontium metaborate hydrogen phosphate, potassium metaborate hydrogen phosphate, boric acid, ammonium borate, ammonium tetraborate octahydrate, magnesium metaborate octahydrate, ammonium borate tetrahydrate, strontium metaborate, strontium tetraborate, strontium tetraborate tetrahydrate, sodium tetraborate decahydrate, manganese borate, zinc borate, ammonium fluoride, ferrous ammonium sulfate, aluminum sulfate, potassium aluminum sulfate, ammonium aluminum sulfate, ammonium sulfate, ammonium sulfate, magnesium sulfate, aluminum hydroxide, magnesium hydroxide, iron hydroxide,It may be cobalt hydroxide, bismuth hydroxide, strontium hydroxide, cerium hydroxide, lanthanum hydroxide, molybdenum hydroxide, ammonium molybdate, zinc tartrate, magnesium trisilicate, telluric acid, manganese tungstate, manganiteferrocene, 5-amino-tetrazole, guanidine nitrate, azodicarbonamide, nylon powder, oxamide, biuret, pentaerythrichine, decabromodiphenyl ether, tetrabromophthalic anhydride, 2,2-bis(bromomethyl)-1,3-propanediol, potassium citrate, sodium citrate, manganese citrate, magnesium citrate, copper citrate, ammonium citrate, or nitroglycerin.

[0073] The above fire extinguishing sheet (150) is a film or sheet containing the above fire extinguishing substance (153), and when a fire occurs in the secondary battery cell (100), the above fire extinguishing substance (153) can perform a fire extinguishing action.

[0074] Fires in secondary batteries can occur for various reasons, and in many cases, leakage of the electrolyte or the gas in which the electrolyte has vaporized occurs from the outer shell, such as the pouch (121), and it is known that combustion starts when the leaked electrolyte and the gas in which the electrolyte has vaporized react with oxygen.

[0075] At this time, as the fire extinguishing sheet (150) melts, the fire extinguishing material (153) enclosed in the fire extinguishing sheet (150) blocks the reaction of the electrolyte or the gas vaporized from the electrolyte with oxygen, thereby preventing the occurrence of a fire, so that the fire can be suppressed in the early stages or the spread of the fire can be delayed to secure time for response.

[0076] Meanwhile, the sealing portion (130) may include a first sealing portion (132) and a second sealing portion (134).

[0077] The first sealing portion (132) is a portion where the first outer layer (125) and the second outer layer (126) are joined, and the second sealing portion (134) is a portion where the first outer layer (125) and the second outer layer (126) are joined to the lead tab (140).

[0078] To be more precise, the lead tab (140) has a synthetic resin such as a PP film coated on the surface of an electrically conductive metal piece, and the film layers of the first outer layer (125) and the second outer layer (126) forming the pouch (121) can be heat-fused with the film layers of the lead tab (140) to form a second sealing portion (134).

[0079] Generally, the bonding strength of the second sealing part (134), which is fused with a different material, may be lower than that of the first sealing part (132), which is heat-fused with a material of the same type.

[0080] Therefore, it can be expected that when the pressure inside the pocket (122) of the pouch (121) rises, leakage is more likely to occur first in the second sealing part (134) than in other parts, and thus, it can be expected that fire may occur more likely in the second sealing part (134) than in other parts.

[0081] Accordingly, the fire extinguishing sheet (150) can be positioned in the pocket (122) of the pouch (121) in close proximity to the second sealing portion (134). Accordingly, the fire extinguishing sheet (150) can be positioned in the portion where the lead tab (140) and the electrode (110) are welded in close proximity to the second sealing portion (134) within the pocket (122) of the pouch (121).

[0082] The above-mentioned fire extinguishing sheet (150) is positioned on each side of the portion where the lead tab (140) and the electrode (110) are welded, and can be bonded using an adhesive or an adhesive film, etc.

[0083] Meanwhile, if necessary, an insulating film (142) may be positioned at the portion where the lead tab (140) and the electrode (110) are welded, and if the insulating film (142) is provided, the fire extinguishing sheet (150) may be positioned on the outside of the insulating film (142).

[0084] That is, the insulating film (142) is attached to one side and the other side of the lead tab (140), and the fire extinguishing sheet (150) is attached to one side and the other side of the insulating film (142).

[0085] Meanwhile, the above-mentioned fire extinguishing sheet (150) is a sheet in which a fire extinguishing substance (153) is sealed between two films that are overlapped with each other.

[0086] That is, as shown in FIG. 5, the aforementioned fire extinguishing material (153) can be enclosed in the fused interior of the first film body (151) and the second film body (152), at least the edges of which are fused and sealed together.

[0087] At this time, the first film body (151) and the second film body (152) may be formed of a material that does not react with the electrolyte or the fire extinguishing substance (153) inside the pocket (122) and does not allow the fire extinguishing substance (153) or the electrolyte to pass through.

[0088] Additionally, the first film body (151) and the second film body (152) may be formed of a material that melts at a temperature lower than the temperature at which a fire occurs in the secondary battery cell (100) when the temperature inside the pouch (121) rises.

[0089] In one embodiment of the present invention, the first film body (151) and the second film body (152) may be made of PP (Polypropylene) or PPA (polyphthalamide). The PP or PPA material does not react with the electrolyte and the fire extinguishing substance (153), and has a melting point of about 150 degrees Celsius, so it does not melt at room temperature. When the temperature inside the pouch (121) rises abnormally, it may be prepared to melt before a fire occurs, thereby exposing the fire extinguishing substance (153) enclosed inside and reacting in advance with the flammable gas originating from the electrolyte.

[0090] Of course, the first film body (151) and the second film body (152) may be formed from other materials other than PP or PPA that have low reactivity with the electrolyte, strong adhesion, and a low melting point.

[0091] The edges of the first film body (151) and the second film body (152) are fused by heat fusion or a laser, etc., and the aforementioned fire extinguishing material (153) may be enclosed within the fused area between the first film body (151) and the second film body (152).

[0092] At this time, the fused portion of the edges of the first film body (151) and the second film body (152) may be formed with a thinner thickness compared to the portion containing the fire extinguishing material (153).

[0093] Meanwhile, the first film body (151) and the second film body (152) may be formed as a single layer as described above, or as shown in FIG. 6, they may each be formed as multiple layers.

[0094] For example, the first film body (151) and the second film body (152) can each be formed with three layers.

[0095] At this time, among the first layer (151a, 152a) to the third layer (151c, 152c) that are sequentially stacked, the first layer (151a, 152a) and the third layer (151c, 152c) are formed of PP (Polypropylene) or PPA (polyphthalamide) material, and the second layer (151b, 152b) formed between the first layer (151a, 152a) and the third layer (151c, 152c) may be formed of PEN (Polyethylene Naphthalate) material.

[0096] In other words, a layer of PEN (Polyethylene Naphthalate) material is formed between a pair of layers of PP (Polypropylene) or PPA (polyphthalamide).

[0097] At this time, the above PP (Polypropylene) or PPA (polyphthalamide) material has a low melting point, which is advantageous for heat fusion and sealing of the first layer (151a, 152a) to the third layer (151c, 152c), and the above PEN (Polyethylene Naphthalate) material has high chemical resistance to electrolytes, which can prevent liquid electrolytes from penetrating.

[0098] In addition, when the first film body (151) and the second film body (152) are fused, the first layer (151a, 152a) of the first film body (151), which is made of the same PP or PPA material, and the third layer (151c, 152c) of the second film body (152) are fused together, thereby providing excellent sealing power.

[0099] Of course, the first and third layers (151a, 152a) can be any material that is easy to fuse, in addition to PP and PPA materials, and the second layer (151b, 152b) can also be any material that has low reactivity with the electrolyte and high chemical resistance, in addition to PEN material.

[0100] Accordingly, according to the secondary battery cell (100) equipped with a fire extinguishing sheet (150) according to the present embodiment, the fire extinguishing sheet (150) is provided very close to the point where gas causing the fire leaks, and the fire extinguishing sheet (150) is also provided inside the pouch (121), so that the fire extinguishing agent component reacts with the gas before the leaking gas meets oxygen, thereby effectively preventing the fire. In addition, when gas leaks, the fire extinguishing agent component is sprayed and scattered along with the gas by the pressure of the leaking gas, so that the fire extinguishing action can be performed even outside the pouch (121).

[0101] In addition, when the temperature rises inside the pouch (121) before a fire occurs, the first film body (151) and the second film body (152) of the fire extinguishing sheet (150) are first melted and exposed inside the pouch (121) so that the fire extinguishing substance (153) can perform a fire extinguishing action and react with the gas inside the pouch (121) first, thereby preventing a fire in advance.

[0102]

[0103] FIG. 7 describes a method for manufacturing a digestive sheet according to another embodiment of the present invention.

[0104] The method for manufacturing a fire extinguishing sheet according to the present embodiment may include a first film body preparation step (S110), a coating step (S120), a cover step (S130), and a sealing step (S140).

[0105] As illustrated in FIG. 8(a), the first film body preparation step (S110) is a step of preparing the first film body (151) by spreading it flat.

[0106] And, the above coating step (S120) is a step of applying a fire extinguishing substance (153) onto the first film body (151) that is prepared, as shown in FIG. 8(b).

[0107] After the fire extinguishing substance (153) is applied, a cover step (S130) may be performed. The cover step (S130) is a step of covering and overlapping the first film body (151) on which the fire extinguishing substance (153) is applied with the second film body (152), as shown in (c) of FIG. 8.

[0108] In addition, the sealing step (S140) is a step of sealing the fire extinguishing material (153) inside by fusing the edges of the first film body (151) and the second film body (152) together, as shown in (d) of FIG. 8.

[0109] At this time, the first film body (151) and the second film body (152) may be larger than the area (154) where the fire extinguishing substance (153) is applied on the first film body (151). That is, the area (154) where the fire extinguishing substance (153) is applied on the first film body (151) may be an inner area surrounded by the area (155) where the first film body (151) and the second film body (152) are sealed.

[0110] Therefore, the fire extinguishing material (153) is not present outside the sealed area (155) of the first film body (151) and the second film body (152), and even if the fire extinguishing sheet (150) is located inside the pocket (122) of the pouch (121), it is separated from the electrolyte by the first film body (151) and the second film body (152) and does not come into contact with it, so it does not affect the performance, lifespan, or reliability of the secondary battery.

[0111]

[0112] Hereinafter, a flame blocker including a fire extinguishing substance according to another embodiment of the present invention and a battery module equipped with the same will be described with reference to the drawings.

[0113] FIG. 2(a) is a drawing showing the pouch (121) of a pouch-shaped battery cell (100) in an open state before being folded, and FIG. 2(b) is a drawing showing the battery cell (100) with the pouch (121) in a folded state.

[0114] A pouch-type battery cell (100) may include an electrode (110), a pouch (121), and a lead tab (140), as shown in FIG. 2 (a) and (b).

[0115] The above electrode (110) can have a positive electrode and a negative electrode stacked in a rectangular shape.

[0116] Additionally, the pouch (121) can serve as an outer shell that encloses the electrode (110). That is, the pouch (121) forms a receiving space in which the electrode (110) is received, and can serve as an outer shell that encloses the electrode (110) to protect it from the outside.

[0117] The above pouch (121) may be made of a film or the like, which has a synthetic resin such as polyethylene terephthalate (PET) coated on the surface of a metal material such as aluminum.

[0118] The above pouch (121) has a pocket (122) formed therein for accommodating the electrode (110) and the electrolyte, and surrounds the electrode (110) to protect the electrode (110) and the electrolyte from the outside and prevents the electrolyte inside from leaking out.

[0119] The above pouch (121) includes a first outer layer (125) forming a first surface of the pocket (122) and a second outer layer (126) forming a second surface of the pocket (122), and the first outer layer (125) and the second outer layer (126) may form a sealing portion (130) joined together at the outer edge of the pocket (122).

[0120] The pocket (122) may be formed only in the first outer layer (125) or may be formed in both the first outer layer (125) and the second outer layer (126).

[0121] Additionally, the lead tab (140) may be formed to extend from the electrode (110) to the outside of the pouch (121) in order to electrically connect the electrode (110) to the outside.

[0122] The above lead tab (140) may be a synthetic resin film, such as polypropylene (PP), coated on the surface of an electrically conductive metal.

[0123] Additionally, the pocket (122) may be formed by being recessed into the first outer layer (125) to form a space in which the electrode (110) and the electrolyte are accommodated.

[0124] Meanwhile, the first outer layer (125) and the second outer layer (126) are formed integrally as shown in FIG. 2 (a), and as shown in FIG. 2 (b), after the electrode (110) is placed, they can be folded and overlapped to be joined to form a sealing portion (130).

[0125] As shown in FIG. 2(b), the sealing portion (130) may be composed of a pair of short side portions (138) on the side where the lead tab (140) is located and a pair of long side portions (136) that are orthogonal to the short side portions (138) and longer than the short side portions (138).

[0126] Meanwhile, when gas or the like is generated during the use of the battery cell (100) and the pressure inside the pocket (122) increases, the pressure of the gas acts on the sealing part (130). At this time, since the length of the long side (136) of the sealing part (130) is structurally longer than the short side (138), the long side (136) may be more vulnerable than the short side (138).

[0127] In particular, the central region of the above-mentioned long side (136) may be the most vulnerable. This is because the gas pressure acts as a uniformly distributed load on the sealing part (130), and the shear force acts to the maximum at the center point of the longest side.

[0128] Therefore, the central region of the above-mentioned long side (136) is the point most vulnerable to gas pressure, and gas leakage may first start at this point.

[0129] If gas and electrolyte leak, the leaked gas and electrolyte may react with oxygen in the atmosphere and start a fire.

[0130] Additionally, the lead tab (140) is coated with a synthetic resin such as a PP film on the surface of an electrically conductive metal piece, and the film layers of the first outer layer (125) and the second outer layer (126) forming the pouch (121) can be heat-fused with the film layers of the lead tab (140) to form a short side portion (138) of the sealing portion (130).

[0131] However, compared to the long side (136) where the same material is heat-fused, the bonding strength of the short side (138) where a different material is fused may be lower.

[0132] This suggests that when the pressure inside the pocket (122) of the pouch (121) rises, there is a high probability that leakage will occur first at the short side (138) compared to other parts, and therefore there is a possibility that a fire may occur at the short side (138). Therefore, for this reason, the short side (138) of the sealing part (130) may also become a leakage risk area where gas leakage may first begin.

[0133] That is, the long side (23) or the short side (138) of the sealing portion (130) of the pouch-type battery cell (100) may be a leakage risk area, and the leakage risk area may be a fire risk area where a fire may first ignite.

[0134]

[0135] FIG. 9 is a drawing illustrating a battery module (200) that accommodates the aforementioned pouch-type battery cell (100).

[0136] The battery module (200) may refer to a unit in which a plurality of battery cells (100) are accommodated in a casing (210).

[0137] In the battery module according to the present embodiment, as shown in FIG. 9, a plurality of pouch-type battery cells (100) may be arranged inside a casing (210).

[0138] As illustrated in FIG. 9, a lead tab (140) is positioned on the side of a pouch-type battery cell (100), and after the pouch-type battery cell (100) is housed inside the casing (210), the lead tab may be electrically connected to the battery cell (100) or electrically connected to an external component.

[0139] At this time, the plurality of battery cells (100) may all be arranged such that the lead tabs (140) are arranged in one direction, or the direction of the lead tabs (140) changes in units of a certain number.

[0140] Meanwhile, the pouch-type battery cell (100) has a pocket (122) portion that protrudes bulgingly, and the sealing portion (130) is formed with a thin thickness, so a space can be formed between the sealing portions (130) of the connected pouch-type battery cells (100).

[0141] And, as shown in FIG. 10, a battery fire propagation blocking stick (230) can be placed in the space between the sealing part (130) and the sealing part (130).

[0142] At this time, a battery fire propagation blocking stick may be placed in the space formed by separating the sealing portion and the portion where the lead tab is placed of the pouch-type battery cell (100).

[0143] The above battery fire propagation blocking stick (230) may include an outer shell (232), heat-blocking beads (234), and fire extinguishing beads (236), as shown in FIG. 10.

[0144] The outer shell (232) may be made of a synthetic resin material such as polypropylene (PP) and may form a receiving space inside which the heat-blocking beads (234) and fire-extinguishing beads (236) are received.

[0145] The above heat-blocking beads (234) are made of a material such as silica and may be made of beads, particles, or powder. Of course, other materials may be used for the heat-blocking beads (234) as long as they have a high melting point and ignition point and low thermal conductivity, in addition to silica. The above heat-blocking beads (234) can absorb or block heat generated by a fire, thereby preventing heat from spreading to adjacent battery cells (100).

[0146] The above fire extinguishing beads (236) may be beads or particles formed from a material containing a fire extinguishing substance.

[0147] The above-mentioned extinguishing material may be the same as the extinguishing material of the extinguishing sheet of the aforementioned embodiment.

[0148] The above-mentioned fire extinguishing material can extinguish a fire if a fire occurs in the pouch-type battery cell (100).

[0149] The particles or powder of the fire extinguishing material described above may be clumped together to form fire extinguishing beads (236), or may be filled inside a thin film in a liquid form to form fire extinguishing beads (236).

[0150] At this time, the heat-blocking beads (234) and fire extinguishing beads (236) are mixed into the receiving space, and the heat-blocking beads (234) and fire extinguishing beads (236) can be mixed in a weight ratio of 6:3 to 8:5, preferably 7:4.

[0151] Meanwhile, the outer shell (232) is made of a synthetic resin material such as polypropylene (PP) and forms a receiving space inside which the heat-blocking beads (234) and fire-extinguishing material beads (236) are received. It may be formed in a stick shape with a circular or elliptical cross-section, with both ends closed and a longitudinal direction in one direction. Of course, the present invention is not limited to the shape of the outer shell (232) and may be formed in various shapes such as a sphere or a tube.

[0152] The above battery fire propagation blocking stick (230) is a capsule that blocks heat generated from a fire in a battery cell (100) from being transferred to an adjacent battery cell (100) and simultaneously extinguishes the fire when it occurs.

[0153] In this embodiment, the battery fire propagation blocking stick (230) is positioned in the space between the lead tabs (140) of mutually adjacent battery cells (100) among the plurality of battery cells (100), as shown in FIG. 10, and may be positioned to have a longitudinal direction parallel to the short side (138) of the battery cell (100). In this case, the length of the battery fire propagation blocking stick (230) may be longer than the length of the lead tab (140) and equal to or shorter than the length of the short side (138) of the battery cell (100).

[0154] The short side (138) where the lead tab (140) of the battery cell (100) is located is a leakage risk area, and there is a risk that a fire may start in the short side (138) which is the leakage risk area. Therefore, the battery fire propagation blocking stick (230) is placed in the leakage risk area to immediately extinguish the fire at the initial stage of occurrence or to delay the propagation of the fire.

[0155] That is, when a fire occurs due to gas leakage at the short side (138), which is the point where the pouch (121) of the battery cell (100) is attached to the lead tab (140), heat is applied to the outer shell (232) and heat-blocking beads (234) of the battery fire propagation blocking stick (230) due to the heat of the fire, the outer shell (232) and the heat-blocking beads (234) melt and stick together to form a fused structure. At this time, the outer shell (232) made of polypropylene material melts and acts as an adhesive to attach the plurality of heat-blocking beads (234) together, so that the heat-blocking beads (234) do not spill or flow down, and can perform the function of blocking heat while maintaining their position and shape between the battery cells (100). In addition, the structure in which the outer shell and the heat-blocking beads (234) are fused together can block or delay the propagation of flame or heat to adjacent battery cells (100).

[0156] Additionally, the fire extinguishing agent beads (236) mixed with the heat-blocking beads (234) can perform a fire extinguishing action as the outer shell (232) melts and is exposed to the atmosphere, and the fire extinguishing substance spreads around. At this time, the structure (138) formed by the heat-blocking beads (234) and the molten outer shell (232) sticking together supports the fire extinguishing agent beads (236) so that the fire extinguishing agent beads (236) do not spill out or detach from their position, and forms a void through which the fire extinguishing substance is sprayed or scattered into the atmosphere or flame from the fire extinguishing agent beads (236), thereby allowing the fire extinguishing agent beads (236) to perform a fire extinguishing action.

[0157] Of course, in addition to the battery fire propagation blocking stick (230) being composed of the fire extinguishing material beads (236) and heat blocking beads (234) in the form of beads, a cured material containing the aforementioned fire extinguishing material and a binder resin such as silicone or a urethane binder resin may be applied within the outer shell (232). Furthermore, the cured material may be cured by a liquid curing method.

[0158]

[0159] FIG. 11 is a drawing showing a part of the casing (210) in which the battery cell (100) is placed, and FIG. 12 is a drawing showing a flame blocker (250) according to an embodiment of the present invention.

[0160] As described above, the battery cell (100) is provided with a lead tab (140), and the lead tab (140) is positioned to face the inner wall surface of the casing (210) and can be electrically connected to each other or to other components not shown.

[0161] And, a flame blocker (250) may be provided in the space between the lead tab (140) and the lead tab (140) or between the sealing part (130) and the sealing part (130) on the inner wall surface of the casing (210).

[0162] The flame blocker (250) is provided to protrude from the inner wall surface of the casing (210) so as to be positioned between the lead tabs (140) of the battery cell (100), thereby blocking the spread of flames generated during a fire in the battery cell (100) to adjacent battery cells (100).

[0163] The flame blocker (250) may be formed integrally with the inner wall surface of the casing (210) or may be coupled to the inner wall surface of the casing (210).

[0164] As shown in FIG. 12, the flame blocker (250) can be formed by an injection molding method using a synthetic resin (252) material. At this time, when the flame blocker (250) is injected, the extinguishing substance (254) can be mixed with the synthetic resin (252) material.

[0165] That is, the above-mentioned fire extinguishing material is mixed into a molten synthetic resin (252) in the form of powder or paste, and the synthetic resin (252) mixed with the above-mentioned fire extinguishing material (254) is injected to form a flame blocker (250).

[0166] Accordingly, a fire extinguishing substance (152) may be distributed inside the flame blocker (250).

[0167] When a fire occurs in the battery cell (100) and flames are generated, the flame blocker (250) can block the generated flames from spreading to adjacent battery cells (100). Additionally, the flame blocker (250) can be melted by the heat of the flames, and as the synthetic resin (252) of the flame blocker (250) melts, the fire extinguishing material (254) distributed inside is exposed to extinguish the fire or reduce the size of the flames to delay the spread of the fire.

[0168] Accordingly, the flame blocker (250) can block the propagation of flames and simultaneously perform a fire extinguishing action or a fire propagation delay action.

[0169] At this time, the fire extinguishing substance (254) is normally distributed inside the synthetic resin of the flame blocker (250) and is protected from external environments such as external moisture and temperature to maintain performance and function, and when a fire occurs, the synthetic resin (252) of the flame blocker (250) melts and is exposed to the outside to perform fire extinguishing action.

[0170] In addition, as the extinguishing agent (254) is distributed inside the flame blocker (250) in a powder or paste state and the resin of the flame blocker (250) melts, only the melted part is exposed, so the duration of the extinguishing action can be relatively long.

[0171] That is, if a space for the battery fire propagation blocking stick (230) to be placed is not formed, the flame blocker (250) can perform the functions of extinguishing and delaying propagation in the event of a battery fire.

[0172] Of course, the battery fire propagation blocking stick (230) and the flame blocker (250) containing the fire extinguishing material may be provided simultaneously.

[0173]

[0174] FIG. 13 is a drawing of another form of a flame blocker comprising a fire extinguishing material according to the present invention.

[0175] In the flame blocker (250) of the above-described embodiment, the extinguishing agent is mixed and distributed inside the synthetic resin (252) forming the flame blocker (250), but the flame blocker (350) containing the extinguishing agent according to the present embodiment may include a extinguishing bag (354) and a mold (352) as shown in FIG. 13.

[0176] The above fire extinguishing bag (354) can be formed by filling the fire extinguishing material (358) inside an outer shell (356) made of a material such as PP (Polypropylene), PPA (polyphthalamide), or PEN (Polyethylene Naphthalate).

[0177] Additionally, the fire extinguishing bag (354) can be inserted into a mold (352) that forms the shape of the flame blocker (350) when the flame blocker (350) is injected.

[0178] That is, as illustrated in FIG. 14, the flame blocker (350) has a fire extinguishing bag (354) containing a fire extinguishing substance (358) placed inside a mold (352) made of synthetic resin.

[0179] The fire extinguishing bag containing the fire extinguishing substance (358) is inserted into the mold (352) when the flame blocker (350) is injected.

[0180] Accordingly, when a fire occurs in the battery cell (100), the outer mold (352) melts and the fire extinguishing bag (354) is exposed, and as the outer shell (356) of the fire extinguishing bag (354) melts, the fire extinguishing material (358) is exposed and can perform a fire extinguishing action.

[0181] At this time, the fire extinguishing material (358) is normally located inside the mold (352) of the flame blocker (350) and is protected by the outer shell (356) to maintain performance and function by being protected from external environments such as external moisture and temperature, so that it can be exposed to the outside and function when a fire occurs.

[0182] Of course, it does not necessarily have to be a fire extinguishing bag (354), and a sealed space may be formed inside the mold (352), and a fire extinguishing substance in the form of a paste or a fire extinguishing substance in the form of a powder may be filled inside the space.

[0183]

[0184] Although embodiments of the present invention have been described, the spirit of the present invention is not limited by the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such are also to be considered to fall within the scope of the spirit of the present invention.

Claims

1. Electrode; A pouch comprising a first outer layer forming a first surface of the pocket and a second outer layer forming a second surface of the pocket, wherein the first outer layer and the second outer layer form a sealing portion joined together at the outer edge of the pocket; A lead tab extending from the electrode to the outside of the pouch; A fire extinguishing sheet containing a fire extinguishing substance, positioned on one side of either the lead tab or the electrode at a location where the lead tab and the electrode are joined within the pocket of the above pouch; A secondary battery cell equipped with a digestion sheet, comprising 2. In Paragraph 1, The sealing portion comprises a first sealing portion in which the first outer layer and the second outer layer are joined, and a second sealing portion in which the lead tab and the first outer layer and the lead tab and the second outer layer are joined. The above-mentioned fire extinguishing sheet is a secondary battery cell equipped with a fire extinguishing sheet located further inside the pocket than the second sealing portion.

3. In Paragraph 1, A secondary battery cell equipped with a fire extinguishing sheet, wherein an insulating film is positioned between the fire extinguishing sheet and the lead tab.

4. In Paragraph 1, The above-mentioned digestive sheet is, A secondary battery cell equipped with a fire extinguishing sheet having a fire extinguishing substance enclosed between two films.

5. In Paragraph 4, The above-mentioned digestive sheet is, At least a first film body and a second film body, wherein the edges are mutually fused and sealed; A fire extinguishing material enclosed inside where the first film body and the second film body are fused together; A secondary battery cell equipped with a digestion sheet, comprising 6. In Paragraph 5, The above first film body and second film body are a secondary battery cell equipped with a fire extinguishing sheet made of PP (Polypropylene) or PPA (polyphthalamide).

7. In Paragraph 5, The above first film body and the above second film body are, First and third layers made of PP (Polypropylene) or PPA (polyphthalamide); A second layer formed between the first layer and the third layer and formed of PEN (Polyethylene Naphthalate) material; A secondary battery cell equipped with a digestion sheet, comprising 8. In Paragraph 7, A secondary battery cell equipped with a fire extinguishing sheet, wherein the layer mutually fused to the first film body and the second film body is of the same material.

9. First film body; A second film body that overlaps with the first film body, with at least a border portion being sealed with the first film body; A fire extinguishing material enclosed inside where the first film body and the second film body are fused together; Digestive sheet containing 10. In Paragraph 9, The above first film body and second film body are fire extinguishing sheets made of PP (Polypropylene) or PPA (polyphthalamide).

11. In Paragraph 9, The above first film body and the above second film body are, First and third layers made of PP (Polypropylene) or PPA (polyphthalamide); A second layer formed between the first layer and the third layer and formed of PEN (Polyethylene Naphthalate) material; A digestive sheet containing 12. In Paragraph 9, A fire extinguishing sheet in which the layer mutually fused to the first film body and the second film body is of the same material.

13. In Paragraph 9, A fire extinguishing sheet in which the portion where the first film body and the second film body are fused is thinner than the portion where the fire extinguishing substance is enclosed.

14. A casing for housing a secondary battery cell equipped with a plurality of fire extinguishing sheets of claim 1; A flame blocker provided to protrude from the inner wall surface of the casing so as to be positioned between the lead tabs of the battery cells, thereby blocking the propagation of flames generated during a battery cell fire to adjacent battery cells; Includes, The flame blocker above is a battery module comprising a fire extinguishing substance.

15. In Paragraph 14, The above flame blocker is a battery module formed by mixing synthetic resin and a fire extinguishing material.

16. In Paragraph 14, The flame blocker above is, Digestive bag containing digestive substances; A mold in which the above-mentioned fire extinguisher is inserted and injected inside; A battery module including 17. In Paragraph 16, The above digestive bag is coat; A fire extinguishing substance filled inside the outer shell; A battery module including 18. In Paragraph 17, A battery module in which the outer shell comprises any one of PP (Polypropylene), PPA (polyphthalamide), or PEN (Polyethylene Naphthalate).

Images