Battery module having fire-extinguishing layer and battery fire blocking stick

Abstract

According to one aspect of the present invention, provided is a battery module having a fire-extinguishing layer, the battery module comprising: one or more battery cells; a casing accommodating the one or more battery cells; and the fire-extinguishing layer in which a fire-extinguishing material is applied to a surface facing a leakage risk area of the battery cells among the inner surfaces of the casing facing the battery cells.

Description

Battery module and battery fire blocking stick with fire extinguishing layer formed

[0001] The present invention relates to a battery module having a fire extinguishing layer formed thereon and a battery fire blocking stick, and more particularly, to a battery module having a fire extinguishing layer formed thereon that can extinguish a battery fire early or delay the spread of the fire when a battery fire occurs and a battery fire blocking stick.

[0002] In recent years, environmental concerns have accelerated the development of electric vehicles to replace conventional internal combustion engines. Furthermore, the advancement of various IT devices is accelerating the development of portable electronic devices such as laptops, mobile phones, and watches.

[0003] These electric vehicles and portable electronic devices all use electricity as a power source, and a representative example of a power source of electric energy is a battery including a secondary battery.

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

[0005] These secondary batteries can be viewed as consisting of battery cells, battery modules in which the battery cells are assembled, and battery packs in which the battery modules are assembled. However, there is a risk of fire occurring between the battery cells and battery modules due to various reasons such as short circuits, overcharging, or overdischarging.

[0006] In general, a battery is composed of electrodes and an outer shell that surrounds the electrodes. When a fire occurs, it is reported that the electrolyte inside leaks from the outer shell, and the leaked electrolyte comes into contact with oxygen and starts to combust.

[0007] In particular, because secondary battery fires are difficult to extinguish due to their nature, early extinguishment is important, and it is also important to delay the spread of fire in the event of an initial fire to secure evacuation time.

[0008] In addition, in the case of electric vehicles, devices or structures for initial firefighting or delaying the spread of fire must be installed inside the vehicle structure. However, the installation of such devices may cause the vehicle interior to become narrower or the space within the battery pack to become narrower, which may reduce battery capacity.

[0009] In the case of small portable electronic devices, there is no space to insert devices for initial fire suppression or fire spread delay in the event of a fire, so a solution is needed.

[0010] In addition, Korean Patent No. 10-1355407 (registered on January 20, 2014) discloses a microcapsule containing a fire extinguishing composition, but when a plurality of cells are provided in a battery module, when a fire occurs in one cell, all fire extinguishing capsules in the battery module are exhausted at once, and when a fire occurs in a battery cell after being affected by the fire, there is a problem in that it becomes impossible to respond.

[0011] The present invention is intended to solve the above problems, and the purpose of the present invention is to provide a battery module and a battery fire propagation delay stick having a fire extinguishing layer formed thereon that can extinguish a fire at an early stage or delay the spread of a fire without taking up a large volume.

[0012] In addition, the present invention aims to provide a battery fire propagation delay stick capable of responding even when multiple cells within a battery module are sequentially burned, and a battery module having the same.

[0013] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0014] According to one aspect of the present invention, a battery module is provided, comprising: one or more battery cells; a casing accommodating the plurality of battery cells; and a fire extinguishing layer formed with a fire extinguishing material on an inner surface of the casing facing the battery cells, the inner surface facing a leakage risk area of ​​the battery cells.

[0015] The battery cell comprises: an electrode; a first outer layer that forms a pocket that accommodates the electrode and an electrolyte, wraps the electrode and protects it from the outside, and forms a first surface of the pocket; and a second outer layer that forms a second surface of the pocket, wherein the first outer layer and the second outer layer are integrally formed and are folded and overlap each other to form a sealing portion that is mutually joined at an outer edge of the pocket; and a lead tab that extends from the electrode to the outside of the pouch, wherein the sealing portion includes a pair of short sides of a side on which the lead tab is positioned and a pair of long sides that are orthogonal to the short sides and are longer than the short sides, and the leakage risk area may be a central area of ​​a side facing the folded side among the long sides.

[0016] The above digestion layer may include a plurality of first straps formed on the entire surface of the casing facing the leakage risk area of ​​the battery cell, or formed in a line shape along the long side portion of the surface of the casing facing the leakage risk area of ​​the battery cell, at a position facing the long side portion where the leakage risk area of ​​each battery cell is formed.

[0017] The position of the first strap facing the leakage risk area may be formed with a thicker width than the rest.

[0018] It may include a second strap that is applied in the form of a line that is perpendicular to the first strap and crosses the middle portion of the plurality of first straps.

[0019] The battery cell may further include a heat transfer prevention capsule that is placed in the space between the lead tabs of adjacent battery cells among the plurality of battery cells and contains a heat transfer prevention material and a fire extinguishing material.

[0020] The above heat transfer prevention capsule may include an outer shell made of synthetic resin; and fire extinguishing beads filled within the outer shell and formed of a fire extinguishing material.

[0021] The battery cell includes a can having one end open and an accommodation space formed therein; an electrode accommodated inside the can; a cover sealing the open end of the can and having a vent hole formed therein through which gas inside the can is discharged; wherein the leakage risk area is the end where the cover is located, the battery cells arranged in the casing are arranged so that the leakage risk areas all face the upper side of the casing, and the fire extinguishing layer may be formed on an inner surface of a fire cover sheet covering the upper side of the battery cells arranged in the casing, the inner surface facing the inside of the casing.

[0022] The above fire protection layer may include a plurality of third straps formed on the entire inner surface of the fire protection cover sheet, or applied in the form of lines having a longitudinal direction along the direction in which the battery cells of the fire protection cover sheet are arranged.

[0023] According to another aspect of the present invention, a battery fire propagation blocking stick is provided, comprising: a tube made of a synthetic resin material forming a receiving space having a longitudinal direction in one direction therein; and a fire extinguishing agent bead containing a fire extinguishing agent that is received in the receiving space formed by the tube.

[0024] The above tube includes an outer shell and an inner shell formed in an inward direction of the receiving space from the outer shell, and a gas layer can be formed between the outer shell and the inner shell.

[0025] The above tube is placed between the battery cells in a casing of a battery module having a plurality of battery cells, and the outer skin can be inflated and fixed to the adjacent battery cells by the gas layer so as to be in close contact with them.

[0026] It may further include a heat-blocking bead that is accommodated within the accommodation space formed by the outer shell and is melted by heat applied during a battery fire and is fused together with the outer shell to form a structure that supports the shape, thereby blocking the transfer of heat.

[0027] In addition, according to another aspect of the present invention, a battery module is provided having a battery fire propagation blocking stick, which includes a plurality of pouch-shaped battery cells; a casing for accommodating the plurality of battery cells; a tube made of synthetic resin material disposed between the battery cells and forming an accommodation space; and a battery fire propagation blocking stick for extinguishing fire, which is accommodated inside the accommodation space and includes fire extinguishing beads.

[0028] The battery cell comprises: an electrode; a first outer layer that forms a pocket in which the electrode and an electrolyte are accommodated, and protects the electrode from the outside by surrounding the electrode and forming a first surface of the pocket; and a second outer layer that forms a second surface of the pocket, wherein the first outer layer and the second outer layer are integrally formed, and the first outer layer and the second outer layer are folded and overlap each other to form a sealing portion that is mutually joined at an outer edge of the pocket; a lead tab extending from the electrode to the outside of the pouch; wherein the sealing portion includes a pair of short sides on a side surface where the lead tab is positioned and a pair of long sides that are orthogonal to the short sides and are longer than the short sides; and the battery fire propagation blocking stick is disposed between the lead tabs of the plurality of battery cells or between the long sides so as to have the same length direction as the length direction of the short sides of the pouch-shaped battery cell, and a filler that is filled between the battery fire propagation blocking stick and the battery cell to fix the battery fire propagation blocking stick within the casing, and absorbs vibration transmitted from the outside. may include.

[0029] The battery module and battery fire propagation delay stick having a fire extinguishing layer formed according to the present invention can extinguish a fire in a battery cell without a complex device, or prevent the heat of the fire from spreading to nearby battery cells, thereby initially suppressing or delaying the spread of the fire. Since the battery module and battery fire extinguishing stick are placed in the space between the sealing portions of pouch-type battery cells, they have the effect of being applicable to existing battery modules without wasting additional space.

[0030] Additionally, it has the effect of responding to cases where multiple battery cells within a battery module are sequentially combusted. The effects of the present invention are not limited to the aforementioned effects, and should be understood to encompass all effects deducible from the detailed description or the composition of the invention described in the claims.

[0031] Figure 1 is a drawing illustrating a typical pouch-type battery cell.

[0032] Figure 2 is a plan view and a cross-sectional view of the pouch-type battery cell of Figure 1.

[0033] FIG. 3 is a drawing showing a battery module in which pouch-shaped cells having a digestion layer applied to the upper surface are arranged according to the first embodiment of the present invention.

[0034] FIG. 4 is a drawing showing a battery module in which pouch-shaped cells having a fire retardant layer applied to the upper and lower surfaces according to the first embodiment of the present invention are arranged.

[0035] FIG. 5 is a drawing showing a pattern of a digestion layer of a battery module according to a first embodiment of the present invention.

[0036] FIG. 6 is a drawing illustrating a heat transfer prevention capsule arranged in a battery module according to the first embodiment of the present invention.

[0037] Figure 7 is a drawing illustrating a typical cylindrical battery cell.

[0038] FIG. 8 is a drawing illustrating a battery module in which cylindrical cells are arranged according to a second embodiment of the present invention.

[0039] FIG. 9 is a drawing showing a pattern of a digestion layer of a battery module according to a second embodiment of the present invention.

[0040] Figure 10 is a drawing illustrating a typical square battery cell.

[0041] FIG. 11 is a drawing illustrating a battery module in which square battery cells are arranged according to a third embodiment of the present invention.

[0042] FIG. 12 is a drawing showing a pattern of a digestion layer of a battery module according to a third embodiment of the present invention.

[0043] FIG. 13 is a drawing illustrating a battery fire propagation blocking stick according to a fourth embodiment of the present invention.

[0044] FIG. 14 is a drawing showing a battery fire propagation blocking stick according to a fourth embodiment of the present invention positioned between pouch-type battery cells to block heat in the event of a fire. (a) is a drawing showing a state before a fire occurs, and (b) is a drawing showing a state in which a fire extinguishing agent is sprayed from a battery fire delay stick when a fire occurs.

[0045] FIG. 15 is a drawing illustrating a battery module equipped with a battery fire propagation blocking stick according to a fourth embodiment of the present invention.

[0046] FIG. 16 is a drawing illustrating a battery fire propagation blocking stick according to a fifth embodiment of the present invention, wherein (a) is a view illustrating a state before a fire occurs, (b) is a view illustrating a state in which a fire occurs primarily in one battery cell, and (c) is a view illustrating a state in which a fire occurs secondarily in another battery cell after the primary fire.

[0047] FIG. 17 is a drawing showing a battery fire propagation blocking stick according to a sixth embodiment of the present invention fixed between batteries.

[0048] FIG. 18 is a drawing showing a battery fire propagation blocking stick according to embodiments of the present invention fixed between batteries by a filler.

[0049] FIG. 19 is a drawing showing a battery fire propagation blocking stick according to the seventh embodiment of the present invention deformed to block heat in the event of a fire. (a) is a view before a fire occurs, and (b) is a view showing a battery fire propagation blocking stick deformed due to a fire.

[0050] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals designate identical or similar components throughout the specification.

[0051] The words and terms used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best explain his or her invention.

[0052] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, so there may be various equivalents and modified examples that can replace the configuration at the time of filing of the present invention.

[0053] In this specification, terms such as “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0054] When a component is said to be "in front of," "behind," "above," or "below" another component, this includes not only being placed "in front of," "behind," "above," or "below" the other component in direct contact with it, but also if there is another component intervening therebetween. Furthermore, when a component is said to be "connected" to another component, this includes not only being directly connected to one another, but also being indirectly connected to one another, unless there are special circumstances.

[0055]

[0056] Hereinafter, a battery module having a digestion layer formed according to a first embodiment of the present invention will be described with reference to the drawings.

[0057] Before describing the battery module (100) in which the digestive layer is formed according to the present embodiment, a general pouch-shaped battery cell (10) is described.

[0058] Fig. 1 (a) is a drawing showing an open state before the pouch (12) of a pouch-shaped battery cell (10) is folded, and Fig. 1 (b) is a drawing showing a battery cell (10) in a folded state of the pouch (12).

[0059] A pouch-shaped battery cell (10) may include an electrode (11), a pouch (12), and a lead tab (16), as shown in (a) and (b) of FIG. 1.

[0060] The above electrode (11) can be laminated with the positive and negative electrodes in a rectangular shape.

[0061] In addition, the pouch (12) can serve as an outer shell that wraps the electrode (11). That is, the pouch (12) forms a space in which the electrode (11) is accommodated, and can serve as an outer shell that wraps the electrode (11) and protects it from the outside.

[0062] The above pouch (12) may be made of a film or the like coated with a synthetic resin such as polyethylene terephthalate (PET) on the surface of a metal material such as aluminum.

[0063] The above pouch (12) is formed with a pocket (15) that accommodates the electrode (11) and the electrolyte, and wraps the electrode (11) to protect the electrode (11) and the electrolyte from the outside, and can prevent the electrolyte inside from leaking to the outside.

[0064] The above pouch (12) includes a first outer layer (13) forming a first surface of the pocket (15) and a second outer layer (14) forming a second surface of the pocket (15), and the first outer layer (13) and the second outer layer (14) can form a sealing portion (21) that is mutually joined at the outer edge of the pocket (15).

[0065] The above pocket (15) may be formed only in the first outer layer (13) or in both the first outer layer (13) and the second outer layer (14).

[0066] In addition, the lead tab (16) may be formed to extend from the electrode (11) to the outside of the pouch (12) in order to electrically connect the electrode (11) to the outside.

[0067] The above lead tab (16) may be a metal surface having electrical conductivity, coated with a synthetic resin film such as polypropylene (PP) on the surface of the metal material.

[0068] In addition, the pocket (15) can be formed by being inserted into the first outer layer (13) to form a space in which the electrode (11) and electrolyte are accommodated.

[0069] Meanwhile, the first outer layer (13) and the second outer layer (14) are formed as one piece as shown in (a) of FIG. 1, and as shown in (b) of FIG. 1, after the electrode (11) is placed, they can be folded and joined while covering each other to form a sealing portion (20).

[0070] Figure 2 (a) is a plan view of a pouch-type battery cell, (b) is an AA cross-sectional view, and (c) is a BB cross-sectional view.

[0071] As shown in Fig. 2, the above sealing portion (20) may be formed of a pair of short sides (24) on the side where the lead tab (16) is located and a pair of long sides (21) that are orthogonal to the short sides (24) and longer than the short sides (24).

[0072] The above-mentioned long edge portion (21) may also include a first long edge portion (22) at the end where the first outer layer (13) and the second outer layer (14) are folded, and a second long edge portion (23) on the side facing the first long edge portion (22).

[0073] Meanwhile, when gas or the like is generated during use of the battery cell (10) and the pressure inside the pocket (15) increases, the pressure of the gas is applied to the sealing portion (20). At this time, since the length of the long side (21) of the sealing portion (20) is longer than the short side (24), the long side (21) may be a more vulnerable part than the short side (24).

[0074] The second long edge portion (23) in which the first outer layer (13) and the second outer layer (14) are joined to form a discontinuous surface is more vulnerable than the first long edge portion (22) in which the first outer layer (13) and the second outer layer (14) are folded to form a continuous surface.

[0075] In particular, the central region of the second side (23) may be the most vulnerable. This is because the pressure of the gas is applied as a uniformly distributed load to the sealing portion (20), and at this time, the shear force is applied to the maximum at the central point of the side with the longest length.

[0076] Therefore, the central region of the second long edge portion (23) is the most vulnerable point to gas pressure, and therefore, gas leakage may first begin in the central region of the second long edge portion (23).

[0077] If gas and electrolyte leak in the above leakage risk area (30), the leaked gas and electrolyte may react with oxygen in the atmosphere, causing a fire. Therefore, the leakage risk area (30) may be a fire risk area where a fire first occurs.

[0078] In addition, the lead tab (16) is a synthetic resin such as PP film coated on the surface of an electrically conductive metal piece, and the film layers of the first outer layer (13) and the second outer layer (14) forming the pouch (12) can be thermally fused with the film layer of the lead tab (16) to form a short side portion (24) of the sealing portion (21).

[0079] However, the bonding strength of the short side (24) where different materials are fused may be lower than that of the long side (21) where the same materials are fused.

[0080] This means that when the pressure inside the pocket (15) of the pouch (12) increases, it is more likely that a leak will occur in the short side (24) than in other areas, and therefore, there is a possibility that a fire will occur in the short side (24). Therefore, for this reason, the short side (24) of the sealing portion (21) may also become a leakage risk area where gas leakage may first begin.

[0081] That is, among the sealing portion (21) of the pouch-type battery cell (10), the long side portion (23) or the short side portion (24) may become a leakage risk area, and the leakage risk area may become a fire risk area (30) where a fire may first ignite.

[0082]

[0083] FIG. 3 is a drawing illustrating a battery module (100) in which a digestion layer is formed according to the first embodiment of the present invention.

[0084] A battery module (100) may refer to a unit in which a plurality of battery cells (10) are housed in a body.

[0085] A battery module (100) having a digestion layer formed according to the present embodiment may include a battery cell (10), a casing (110), and a digestion layer (120), as shown in FIG. 1.

[0086] In the first embodiment of the present invention, the battery cell (10) may be a pouch-shaped battery cell (10) as described above.

[0087] The above casing (110) is formed in the shape of a roughly rectangular parallelepiped and can accommodate a plurality of pouch-shaped battery cells (10) inside.

[0088] The above-mentioned digestion layer (120) can be formed by applying a digestion material to the inner surface of the casing (110) facing the battery cell (10), the surface facing the leakage risk area (30) of the battery cell (10).

[0089] The above digestion layer (120) may be a layer to which a digestive substance is applied. The above-mentioned extinguishing agent is preferably a extinguishing agent having a melting point of 100°C or higher, which generates a extinguishing agent through high-temperature decomposition to ensure the functional stability of the extinguishing agent composition at room temperature and to facilitate long-term storage, and is a brominated extinguishing agent, such as tetrabromobisphenol A, tetrabromobisphenol A ether, 1,2-bis(tribromophenoxy)ethane, 1,2-bis(tetrabromophthalamide)ethane, 4-bromophthalic acid dimethyl ester, tetrabromophthalic acid disodium, decabromodiphenyl ether, tetradecabromo-1,4-diphenoxybenzene, 1,2-bis(pentabromofenyl)ethane, bromotrimethylphenyl indane (BTMPI), pentabromobenzyl acrylate, hexabromobenzene, pentabromotoluene, hexabromocyclododecane, Ethylene-bis(5,6-dibromonobonane-2,3-dicarboximide), pentabromochlorocyclohexane, brominated styrene polymer, tetrabromobisphenol A carbonate ester oligomer, polypentabromobenzyl acrylate, polydibromophenylene ether; chlorinated fire extinguishing materials such as Dechlorane Plus, chlorenedic anhydride, perchloropentacyclodecane, tetrachlorobisphenol A, polychloroolefins, chlorinated polyvinyl chloride, vinyl chloride-vinylidene chloride copolymer, chlorinated polyethylene; Organophosphorus extinguishing agents include 1-oxo-4-hydroxymethyl-2,6,7-trioxahetero-1-phosphabicyclo[2,2,2]octane, 2,2-dimethyl-1,3-propyleneglycol-bis(neopentyl glycol)bisphosphonate, 9,10-dihydrogen-9-oxahetero-10-phosphaphenanthrene-10 oxide, bis(4-carboxyphenyl)phenyl phosphorus oxide, bis(4-hydroxyphenol)phenyl phosphorus oxide, and oligomeric phenyl(diphenyl sulfone) phosphonates;Tri(2,2-bis(bromomethyl)-3-bromopropyl) phosphate, tri(2-bromophenyl) phosphate, 3,9-bis(tribromophenyl)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-dioxundecane, 3,9-bis(pentabromophyll)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-dioxundecane, 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-propyleneglycol-bis(neopentylglycol)bisphosphonate, 2,9-bis(tribromopro)-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]-3,9-deoxyundecane;Nitrogen-based and phosphorus-nitrogen-based fire extinguishing materials, 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 aminosulfonate, urea, dihydrogen urea phosphate, dicyandiamide, bis(2,6,7-trioxyhetero-1-phosphahetero-bicyclo[2,2,2]octane-1-oxo-4-methyl) Hydroxyl phosphate ester melamine, 3,9-dihydroxy-3,9-dioxy-2,4,8,10-tetraoxahetero-3,9-diphosphaspiro[5,5]undecane-3,9-bismelamine, 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-dioxyhetero-2-phosphaheterohexyl)-2,2'-meta-phenylenediamine, tri(2-oxo-5,5-dimethyl-1,3-dioxyhetero-2-heterocyclohexyl-2-methyl)amine, phenoxycyclophosphazene, inorganic fire extinguishing materials, ammonium polyphosphate, diammonium hydrogen phosphate, Ammonium dihydrogen phosphate, zinc phosphate, aluminum phosphate, boron phosphate, antimony trioxide, aluminum hydroxide, magnesium hydroxide, kaolinite, basic aluminum hydroxide, zinc borate, barium metaborate, zinc oxide, zinc sulfide, zinc sulfate heptahydrate, aluminum borate single crystal, ammonium octamolybdate, hexaammonium molybdate, zinc stannate, tin oxide, ferrocene, iron acetone, ferric oxide, ferric trioxide, sodium tungstate, potassium hexafluorotitanate, potassium hexafluorozirconate, titanium dioxide, calcium carbonate, barium sulfate.;

[0090] And other chemicals with a decomposition temperature of 100℃ or higher that can decompose extinguishing substances, 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 bicarbonate, sodium tartrate, sodium acetate, potassium acetate, acetic acid Zinc, 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 trimetaphosphate, ammonium hypophosphate, ammonium orthophosphite Dihydrogen phosphate, manganese phosphate, zinc dihydrogen phosphate, dimanganese hydrogen phosphate, guanidine phosphate, melamine phosphate, urea phosphate, strontium dihydrogen phosphate metaborate, potassium dihydrogen phosphate metaborate, 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 fluoroborate, ferrous ammonium sulfate, aluminum sulfate, aluminum potassium sulfate, aluminum ammonium sulfate, ammonium sulfate, magnesium sulfate, aluminum hydroxide, magnesium hydroxide, iron hydroxide,Cobalt hydroxide, bismuth hydroxide, strontium hydroxide, cerium hydroxide, lanthanum hydroxide, molybdenum hydroxide, ammonium molybdate, zinc stannate, magnesium trisilicate, telluric acid, manganese tungstate, manganese ferrocene, 5-amino-tetrazol, guanidine nitrate, azodicarbonamide, nylon powder, oxamide, biuret, pentaerythritol, decabromo diphenyl ether, tetrabromophthalic anhydride, 2,2-bis(bromomethyl)-1,3-propanediol, potassium citrate, sodium citrate, manganese citrate, magnesium citrate, copper citrate, ammonium citrate, nitro guanidine.

[0091] The above-mentioned fire extinguishing layer (120) is a layer containing the fire extinguishing material, and when a fire occurs in the secondary battery cell, the fire extinguishing material can perform an extinguishing action.

[0092] The above digestion layer (120) may be formed in the form of a paste or paint containing the digestion material, by coating, printing, or spraying.

[0093] Accordingly, by forming a fire extinguishing layer (120) on the inner surface of the casing (110) facing the leakage risk area (30) of the battery cell (10), a fire that occurs can be extinguished at an early stage or the spread of the fire can be delayed to secure response time.

[0094] Meanwhile, as shown in FIG. 3, when the pouch-shaped battery cell (10) is placed within the casing (110), the battery cell (10) can be placed so that the second long edge (23) where the leakage risk area (30) is formed all faces the upper side of the casing (110).

[0095] In this case, the digestion layer (120) can be formed on the inner surface of the surface forming the upper surface (112) of the casing (110).

[0096] Alternatively, as illustrated in FIG. 4, when the pouch-shaped battery cells (10) are placed within the casing (110), some of the battery cells (10) may be placed so that the second long edge portions (23) where the leakage risk area (30) is formed all face the upper side of the casing (110), and the rest may be placed so that the second long edge portions (23) where the leakage risk area (30) is formed all face the upper side of the casing (110).

[0097] In this case, the digestion layer (120) can be formed on the inner surface of the surface forming the upper surface (112) and lower surface (114) of the casing (110).

[0098] Alternatively, although not shown in the drawing, the second long edge (23) where the leakage risk area (30) of the battery cell (10) is formed may be positioned so that it faces the lower side of the casing (110), and the fire extinguishing layer (120) may be formed on the inner surface of the surface forming the lower surface (114) of the casing (110).

[0099] FIG. 5 is a drawing showing a pattern of a fire extinguishing layer (120) formed on the inner surface of a casing (110) of a battery module (100) having a fire extinguishing layer formed according to a first embodiment of the present invention.

[0100] The above digestion layer (120) can be formed on the entire inner surface of the casing (110) facing the battery cell (10), and facing the leakage risk area (30) of the battery cell (10).

[0101] Alternatively, the digestion layer (120) may be formed in a strip-shaped pattern on the inner surface of the casing (110) facing the battery cell (10), facing the leakage risk area (30) of the battery cell (10), thereby reducing waste of the digestion material.

[0102] That is, as shown in (a) of FIG. 5, the digestion layer (120) may include a plurality of first straps (122) applied in the form of lines formed along the second long edge (23) at positions facing the second long edge (23) where the leakage risk area (30) of each battery cell (10) is formed on the inner surface of the casing (110) facing the leakage risk area (30) of the battery cell (10).

[0103] That is, the fire extinguishing material is applied only to the area facing the second edge (23), which is the point where gas or electrolyte leakage or fire occurs.

[0104] Therefore, the above digestive material can be used more efficiently.

[0105] At this time, as shown in (b) of Fig. 5, the central portion facing the leakage risk area (30), which is the point where gas or electrolyte leakage or fire occurs, of the first strap (122a) is formed with a thicker width than the rest, so that the fire suppression and propagation delay effect can be further improved.

[0106] Alternatively, as shown in (c) of FIG. 5, a second strap (124) may be further formed, which is applied in a line shape that is perpendicular to the first strap (122) and crosses the middle portion of the plurality of first straps (122).

[0107] The second strap (124) may be formed to cross the middle portion of the first strap (122) facing the leakage risk area (30).

[0108]

[0109] Meanwhile, the lead tab (16) is a synthetic resin such as PP film coated on the surface of an electrically conductive metal piece, and the film layers of the first outer layer (13) and the second outer layer (14) forming the pouch (12) can be thermally fused with the film layer of the lead tab (16) to form a short side portion (24) of the sealing portion (21).

[0110] However, the bonding strength of the short side (24) where different materials are fused may be lower than that of the long side (21) where the same materials are fused.

[0111] This means that when the pressure inside the pocket (15) of the pouch (12) increases, it is more likely that leakage will occur in the short side (24) than in other areas, and therefore, there is a possibility that a fire will occur in the short side (24). In this case, the short side (24) may become a leakage risk area where gas or electrolyte leakage may begin.

[0112] Accordingly, the battery module according to the first embodiment of the present invention, as illustrated in FIG. 6, is disposed in the space between lead tabs (16) of adjacent battery cells (10) among the plurality of battery cells (10), and may include a battery fire propagation blocking stick (130) containing a heat transfer prevention material and a fire extinguishing material.

[0113] That is, since the pouch (12) type battery cell (10) has a bulging pocket (15) portion, a space is formed between the lead tabs (16) of adjacent battery cells (10), and a battery fire propagation blocking stick (130) is placed in that space.

[0114] The above battery fire propagation blocking stick (130) is a capsule that blocks heat from being transferred to adjacent battery cells (10) and at the same time extinguishes a fire when one occurs.

[0115] The above battery fire propagation blocking stick (130) may include an outer shell (132) and a fire extinguishing agent bead (136), as shown in FIG. 6.

[0116] The above outer shell (132) may be made of a film made of a synthetic resin such as polypropylene (PP). The above outer shell (132) may be formed in the shape of a hollow pipe with both ends closed, thereby forming a space inside which the fire extinguishing agent beads (136) are accommodated.

[0117] In addition, the above-described extinguishing agent beads (136) can be formed by clumping the aforementioned extinguishing agent into a bead shape.

[0118] Therefore, the heat blocking beads (134) and fire extinguishing beads (136) can be incorporated into the outer shell (132) to exhibit heat blocking and fire extinguishing capabilities.

[0119] At this time, the battery fire propagation blocking stick (130) can be extended to have a longitudinal direction in the direction of the short side (24) of the battery cell (10).

[0120] That is, when a fire occurs in the short side (24) of the battery cell (10), the outer shell (132) melts, the fire extinguishing beads (136) are activated by heat, and the fire extinguishing material is ejected, so that the gas leaking from the battery cell (10) reacts with the ejected fire extinguishing material before it reacts with oxygen, thereby blocking or extinguishing the fire.

[0121] Accordingly, even if a leak or fire occurs in the long side (21) and short side (24) of the pouch (12) type battery cell (10) accommodated in the battery module (100), it can be easily extinguished.

[0122] Of course, the above-mentioned battery fire propagation blocking stick (130) may, in addition to the fire extinguishing agent beads (136) formed in a bead shape, apply a cured material containing the aforementioned fire extinguishing agent and a binder resin such as silicone or a urethane binder resin within the outer shell (132). In addition, the cured material may be cured using a liquid curing method.

[0123]

[0124] Figure 7 is a drawing illustrating a typical cylindrical battery cell (50).

[0125] A cylindrical battery cell (50) may include a cylindrical can (51) that forms an outer shell and has a receiving space formed inside, one end of which is open, and an electrode (52) and a cover (53) that are received inside the can (51).

[0126] The cover (53) seals the open end of the can (51) to prevent the electrode (52) and electrolyte inside the can (51) from leaking to the outside, and a vent hole (54) through which gas generated inside the can (51) is discharged can be formed in the center.

[0127] In the case of a cylindrical battery cell (50), the vent hole (54) is blocked by a vent ball (55) and a cap (56) to prevent electrolyte, etc. from leaking through the vent hole (54).

[0128] However, if gas is excessively generated inside the can (51) due to overcharging, overdischarging, a rise in battery temperature, or an external impact, and the pressure increases, the gas and electrolyte may leak through the vent hole (54) despite being blocked by the vent ball (55) and the cap (56). This may mean that the end where the cover (53) where the vent hole (54) is formed becomes a risk area for leakage (60).

[0129]

[0130] FIG. 8 is a drawing illustrating a battery module (200) having a digestive layer formed according to a second embodiment of the present invention.

[0131] Similar to the above-described embodiment, the battery module (200) having a digestion layer formed according to the present embodiment may also include a battery cell (50), a casing (210), and a digestion layer (220). In this case, in the present embodiment, the battery cell (50) may be a cylindrical battery cell (50).

[0132] The above casing (210) is formed in the shape of a roughly rectangular parallelepiped and can accommodate a plurality of cylindrical battery cells (50) therein.

[0133] The above-mentioned digestion layer (220) can be formed by applying a digestion material to the inner surface of the casing (210) facing the battery cell (50), the surface facing the leakage risk area (60) of the battery cell (50).

[0134] The above cylindrical battery cells (50) can be arranged in multiple numbers so that the cover (53), which is the leakage risk area (60), faces upward.

[0135] In addition, a fireproof cover sheet (230) may be placed on the upper side of the cylindrical battery cell (50) inside the casing (210). The fireproof cover sheet (230) is a panel made of mica powder and is widely used for fire prevention due to its excellent fire resistance and heat resistance.

[0136] At this time, the fire extinguishing layer (220) may be formed on the inner surface of the fire cover sheet (230) facing the inside of the casing (210) that covers the upper side of the battery cell (50) placed in the casing (210).

[0137] That is, the fire extinguishing layer (220) is applied to the inner surface of the fire cover sheet (230), i.e., the surface facing the leakage risk area (60) of the cylindrical battery cell (50).

[0138] The above fire extinguishing layer (220) can be formed on the entire inner surface of the fire cover sheet (230) that faces the leakage risk area (60) of the battery cell (50).

[0139] Alternatively, as illustrated in (a) of FIG. 9, the fire extinguishing layer (220) may include a plurality of third straps (222) applied in a line shape having a longitudinal direction along the direction in which the battery cells (50) of the fire cover sheet (230) are arranged.

[0140] At this time, the third strap (222) may be formed to have a width equal to or greater than the diameter of the can (51) of the cylindrical battery cell (50) or the diameter of the vent hole (54).

[0141] Alternatively, as shown in (b) of Fig. 9, it may be applied in the form of dots (224) at a position facing the battery cell (50) of the fire cover sheet (230).

[0142] That is, it is formed in the shape of a dot (224) at each location facing the above leakage risk area (60).

[0143] At this time, the dot (224) can be formed in various shapes such as a circle, a square, a triangle, or a pentagon.

[0144] Additionally, the dot (224) may be formed with an area equal to or larger than the cross-sectional area of ​​the can (51) or the cross-sectional area of ​​the vent hole (54).

[0145]

[0146] Figure 10 is a drawing illustrating a typical square battery cell.

[0147] A square battery cell (80) may include a cylindrical battery cell (80) that forms an outer shell and has a receiving space formed inside, a rectangular parallelepiped can (81) with one end open, and an electrode (82) and a cover (83) that are received inside the can (81).

[0148] The above cover (83) seals the open end of the can (81) to prevent the electrode (82) and electrolyte inside the can (81) from leaking to the outside, and a vent hole (84) through which gas generated inside the can (81) is discharged can be formed in the center.

[0149] However, if gas is excessively generated inside the can (81) due to overcharging, overdischarging, a rise in battery temperature, or an external impact, and the pressure increases, the gas and electrolyte may leak through the vent hole (84). This may mean that the location where the vent hole (84) of the cover (83) where the vent hole (84) is formed becomes a risk area for leakage (90).

[0150]

[0151] FIG. 11 is a drawing illustrating a battery module (300) having a digestive layer formed according to a third embodiment of the present invention.

[0152] Similar to the above-described embodiment, the battery module (300) having a digestion layer formed according to the present embodiment may also include a battery cell (80), a casing (310), and a digestion layer (320). In this case, in the present embodiment, the battery cell (80) may be a square battery cell (80) of FIG. 10.

[0153] The above casing (310) is formed in the shape of a roughly rectangular parallelepiped and can accommodate a plurality of square battery cells (80) therein.

[0154] The above digestion layer (320) can be formed by applying a digestion material to the inner surface of the casing (310) facing the battery cell (80), the surface facing the leakage risk area (90) of the battery cell (80).

[0155] The above square battery cells (80) can be arranged in multiple numbers so that the cover (83), which is the leakage risk area (90), faces upward.

[0156] In addition, a fireproof cover sheet (330) may be placed on the upper side of the square battery cell (80) inside the casing (310). The fireproof cover sheet (330) is a panel made of mica powder and is widely used for fire prevention due to its excellent fire resistance and heat resistance.

[0157] At this time, the fire extinguishing layer (320) may be formed on the inner surface of the fire cover sheet (330) facing the inside of the casing (310) that covers the upper side of the battery cell (80) placed in the casing (310).

[0158] The fire extinguishing layer (320) may be formed on the entire inner surface of the fire cover sheet (330) facing the leakage risk area (90) of the battery cell (80), or, as shown in (a) of FIG. 12, the fire extinguishing layer (320) may be formed as a fourth strap (322) applied in the form of a line having a longitudinal direction along the direction in which the battery cell (80) of the fire cover sheet (330) is arranged, or, as shown in (b) of FIG. 12, the fire extinguishing layer (320) may be applied in the form of a dot (324) at each position facing the battery cell (80) of the fire cover sheet (330).

[0159] When the above digestion layer (320) is formed as a fourth strap (322), the third strap may be formed with a width equal to or slightly larger than the width of the vent hole (84) of the square battery cell (80).

[0160] Alternatively, when the digestion layer (320) is formed in the shape of a dot (324), the dot (324) may be formed with an area equal to or larger than the cross-section of the vent hole (84) of the square battery cell (80).

[0161]

[0162] FIG. 13 is a drawing illustrating a battery fire propagation blocking stick (430) according to a fourth embodiment of the present invention.

[0163] The battery fire propagation blocking stick (430) according to the present embodiment may include a tube (432) and a fire extinguishing agent bead (436), as illustrated in FIG. 13.

[0164] The above tube (432) may be made of a synthetic resin material such as polypropylene (PP), and may form a space therein in which the fire extinguishing agent beads (436) are accommodated.

[0165] The above-mentioned fire extinguishing beads (436) may be beads or particles formed of a material containing a fire extinguishing agent.

[0166] The above-mentioned digestive beads (436) can be formed by clumping the aforementioned digestive substances into a bead shape.

[0167] The above-mentioned fire extinguishing material can have an extinguishing effect in the event of a fire in the pouch-type battery cell (10).

[0168] The particles or powder of the above-described extinguishing agent may be clumped together to form extinguishing agent beads (436), or may be filled in a thin film in liquid form to form the extinguishing agent beads (436).

[0169] That is, a fire occurs when a combustible gas leaking from a battery cell meets oxygen, but the fire extinguishing material reacts first before the combustible gas meets oxygen, thereby blocking the reaction with oxygen, thereby preventing the fire from occurring.

[0170]

[0171] Meanwhile, the tube (432) is made of a synthetic resin material such as polypropylene (PP), forms a space therein for accommodating the fire extinguishing beads (436), and may be formed in the shape of a stick having a longitudinal direction in one direction. Of course, the present invention is not limited to the shape of the tube (432), and may be formed in various shapes such as a spherical shape.

[0172] In the event of a fire in the above battery cell (10), as shown in FIG. 14, first, the pressure inside the pouch-shaped battery cell (10) increases due to various causes, causing gas leakage in the fire risk area (30), and a fire occurs when the leaked gas reacts with oxygen in the atmosphere.

[0173] At this time, as shown in (b) of FIG. 14, when the tube (432) of the battery fire propagation delay stick (430) melts, the extinguishing component of the extinguishing material is ejected from the extinguishing agent beads (436), and before the gas leaked from the battery cell (10) meets oxygen, the gas ejected from the extinguishing agent beads (436) meets the oxygen, thereby suppressing the occurrence of a fire.

[0174]

[0175] At this time, in the present embodiment, the battery fire propagation delay stick (430) is disposed in the space between the lead tabs (16) of the adjacent battery cells (10) among the plurality of battery cells (10), as shown in FIGS. 6 and 14, and may be disposed to have a longitudinal direction parallel to the short side (24) of the battery cell (10). At this time, the length of the battery fire propagation delay stick (130) may be longer than the length of the lead tab (16) and equal to or shorter than the length of the short side (24) of the battery cell (10).

[0176] As illustrated in Fig. 1, the short end (24) where the lead tab (16) of the battery cell (10) is located is a leakage risk area and a fire risk area (30), and there is a risk that a fire will start in the short end (24) which is a leakage risk area. Therefore, the battery fire propagation delay stick (130) is placed in the leakage risk area to immediately extinguish or delay the fire at the initial stage.

[0177] At this time, the tube (432) may be formed of a material such as polypropylene or polyphthalaminde. Since the material of polypropylene or polyphthalaminde is a non-permeable and non-conductive material, external moisture can be prevented from affecting the fire extinguishing agent beads (436) inside the receiving space.

[0178]

[0179] Meanwhile, when a fire occurs in one of the plurality of battery cells (10) provided in the casing (110), the heat of the fire may cause fires to occur in other battery cells (10) nearby or within the casing (110). However, when the first fire occurs, if all of the battery fire propagation delay sticks (430) arranged inside the casing (110) react and are exhausted, there is a problem that it is difficult to respond to a second fire that occurs in succession due to the influence of the first fire because there are no spare battery fire propagation delay sticks (430) that can react.

[0180] Therefore, the battery fire propagation delay stick (430) according to the present embodiment can delay the time of reaction to fire to some extent so that the battery fire propagation delay stick (430) is still reacting even when a second fire occurs.

[0181] For this purpose, the thickness (d1) of the material of the tube (432) may be 0.4 to 0.6 mm. If the material of the tube (432) is too thin, such as 0.3 mm or less, the tube (432) may be completely melted at the time of the first fire, and the fire extinguishing beads (436) inside may all react and be consumed. However, if the thickness (d1) of the material of the tube (432) is between 0.4 to 0.6 mm, it takes some time for the tube (432) to melt, and the point in time when the fire extinguishing beads (436) start to react is delayed, so that even when a second fire occurs, the battery fire propagation delay stick (430) may still be in a reacting state.

[0182] Additionally, a cap (438) may be provided at the end of the tube (432). The cap (438) may be tightly fused to the end of the tube (432) by heat fusion or laser fusion, etc., to form a seal, thereby preventing external moisture from entering the inside of the receiving space.

[0183]

[0184] FIG. 15 is a drawing showing a battery module equipped with a battery fire propagation delay stick of the present invention. In the above description, the battery fire propagation delay stick (130) is arranged in the space between the lead tabs (16) so as to be parallel to the short sides (24) of the battery cells (10). However, as shown in FIG. 5, if necessary, the battery fire propagation delay stick (430) may be arranged between the long sides (21) of a plurality of battery cells (10) arranged in the housing (110).

[0185] That is, as described above, the central portion of the long side portion (21) is a leakage risk area vulnerable to the pressure within the pouch (12), and there is a risk that a fire may start in the leakage risk area, the long side portion (21). Therefore, the battery fire propagation delay stick (130) is arranged in the space between the long side portions (21) of the battery cell (10), and may be arranged to have a longitudinal direction parallel to the long side portion (21) of the battery cell (10). At this time, the length of the battery fire propagation delay stick (130) may be equal to or shorter than the length of the long side portion (21) of the battery cell (10).

[0186] Additionally, although not shown or described in detail, battery fire propagation delay sticks (430) may be placed on both the long side (21) and the short side (24) of the battery cell (10).

[0187]

[0188] Hereinafter, a battery fire propagation delay stick (530) according to a fifth embodiment of the present invention will be described.

[0189] The battery fire propagation delay stick (530) according to the present embodiment may include a tube (532), an extinguishing agent bead (536), and a cap (538), as shown in (a) of FIG. 16.

[0190] At this time, the above-mentioned digestive beads (536) are the same as the above-mentioned embodiment, so a detailed description will be omitted.

[0191] Meanwhile, the tube (532) may include an outer shell (533) and an inner shell (534). The outer shell (533) may be formed in a cylindrical shape as a synthetic resin material. In addition, the inner shell (534) may be formed of the same or different material as the outer shell (533), and may be formed spaced apart from the outer shell (533) in the inward direction of the receiving space, and may be formed in a cylindrical shape to form a space in which the fire extinguishing agent beads (536) are filled.

[0192] At this time, the outer shell (533) may be formed of at least one material among polypropylene or polyphthalamide, or may be a material that is impermeable to moisture and gas and has a melting point similar to polypropylene or polyphthalamide.

[0193] At this time, a gas layer (535) may be formed in the space where the outer skin (533) and the inner skin (534) are separated. The gas layer (535) may be air or an inert gas such as nitrogen or argon.

[0194] The above-mentioned fire extinguishing agent beads (536) are filled in the receiving space formed by the inner skin, and when both the outer skin (533) and the inner skin are melted by heat, they can be exposed to fire and spray the fire extinguishing agent.

[0195] Meanwhile, a cap (538) is provided at either or both ends of the tube (532) formed by the outer shell (533) and the inner shell (534), so as to seal the gas layer (535) between the outer shell (533) and the inner shell (534) and the fire extinguishing agent beads (536) filled inside the receiving space.

[0196] At this time, the thickness (d2) of the material of the outer skin (533) and the inner skin (536) may be approximately 0.2 to 0.3 mm, and the gap (d3) between the outer skin (533) and the inner skin (534) may be approximately 0.1 mm. Of course, this is a value that may be changed as needed.

[0197] That is, as shown in (b) of FIG. 16, when a first fire occurs, the outer shell (133) may melt, but since insulation is provided by the gas layer (535) between the outer shell (133) and the inner shell (134), the inner shell (534) may not melt, and thus the extinguishing agent beads (536) within the receiving space may not react. When a second fire occurs, as shown in (c) of FIG. 16, while the outer shell (533) is melted, the inner shell (534) may melt, and the extinguishing agent beads (536) may react to the fire by heat and spray extinguishing agents to respond to the fire.

[0198]

[0199] Meanwhile, when a battery module (100) equipped with a battery fire propagation blocking stick is mounted on a vehicle, etc., external vibrations and shocks may be applied during driving, and there is a risk that the battery fire propagation blocking stick (430, 530) may be damaged by such vibrations and shocks.

[0200] Accordingly, the battery fire propagation blocking stick (430, 530) can be fixed so as not to move within the casing (110) of the battery module, and also, external vibrations can be vibration-insulated from being transmitted to the battery fire propagation blocking stick (430, 530).

[0201] Accordingly, an insulating fixture may be provided at both ends of the battery fire propagation delay stick to fix the tube to the inner wall of the casing and insulate vibration transmitted from the outside.

[0202] The above insulating fixture may be provided separately from the cap (438, 538), or the cap (438, 538) may be made of rubber or synthetic resin material having vibration-insulating properties, so that the cap (438, 538) itself may perform the function of the insulating fixture. In this embodiment, an example in which the cap (438, 538) itself is provided to perform the function of the insulating fixture will be described.

[0203] In addition, the insulating fixture is adhered to, attached to, or fixed to the inside of the wall of the casing (110), so that even if an external impact is transmitted, the position of the battery fire propagation delay stick (430, 530) can be prevented from moving from its original position.

[0204]

[0205] Fig. 17 is a drawing illustrating a battery fire propagation blocking stick according to the sixth embodiment of the present invention.

[0206] The battery topic radio wave blocking stick (630) according to the present embodiment may include, similarly to the fifth embodiment described above, a tube (632) composed of an outer shell (633) and an inner shell (634), fire extinguishing beads (636) filled in the receiving space of the tube (632), and a cap (638) provided at the end of the tube (632).

[0207] In the above-described embodiment, the insulating fixture was fixed to the inside of the wall of the casing to fix the battery fire propagation delay stick, but according to the battery fire propagation delay stick (630) of the present embodiment, the outer shell (633) can be fixed by swelling due to the pressure of the gas layer (635) and coming into close contact with the nearby battery cell (10).

[0208] That is, as illustrated in FIG. 17, the outer skin (633) of the battery fire propagation blocking stick positioned between the battery cell (10) and the sealing portion of the battery cell (10) can be inflated by the gas layer (635) and fixed in close contact with the nearby battery cell (10).

[0209] To this end, gas may be injected into the cap (638) of the battery fire propagation blocking stick (630) located between the battery cell (10) and the sealing portion (20) of the battery cell (10) through a syringe needle (639) or the like to expand the outer shell (633).

[0210] At this time, the outer shell (633) may be formed of a material that is impermeable to moisture and gas as described above, and has a melting point similar to polypropylene or polyphthalamide, and also has elasticity.

[0211] Additionally, the cap (638) may be formed of a material that can self-seal even after being pricked by a needle (639) and the needle is removed.

[0212]

[0213] In the above-described embodiment, the insulating fixing body of the battery fire propagation blocking stick was fixed or the outer shell (633) was expanded to fix the stick, but as shown in FIG. 18, the battery fire propagation blocking stick (430, 530, 630) can be fixed within the casing (110) by a separate filler (140).

[0214] The above battery fire propagation blocking stick (430, 530, 630) is positioned between the battery cells, and a filler (140) is filled between the battery fire propagation blocking stick (430, 530, 630) and the battery cell (10), thereby fixing the battery fire propagation blocking stick (430, 530, 630) within the casing (110) and absorbing vibration transmitted from the outside.

[0215] The above-mentioned filler (140) may include small-sized beads filled with gas such as air inside an outer shell such as aerogel or polypropylene.

[0216] FIG. 19 is a drawing illustrating a battery fire propagation blocking stick (730) according to the seventh embodiment of the present invention.

[0217] The battery fire propagation blocking stick (730) according to the present embodiment may include a tube (732), a heat blocking bead (734), and a fire extinguishing bead (736).

[0218] The above tube (732) may be made of a synthetic resin material such as polypropylene (PP), and may form a space therein in which the heat-blocking beads (734) and fire extinguishing beads (736) are accommodated.

[0219] The above heat-blocking beads (734) are made of a material such as silica and may be made of beads, particles, powder, etc. Of course, the heat-blocking beads may be made of other materials besides silica as long as they have high melting and ignition points and low thermal conductivity. The heat-blocking beads (734) can absorb or block heat generated by a fire, thereby preventing the heat from spreading to adjacent battery cells (10).

[0220] The above fire extinguishing beads (736) are beads or particles formed of a material containing a fire extinguishing agent, and when a fire occurs in the battery cell (10), they can spray a fire extinguishing agent that reacts with the heat of the fire and has an extinguishing effect.

[0221] The particles or powder of the above-described extinguishing agent may be clumped together to form extinguishing agent beads (736), or may be filled in a thin film in liquid form to form the extinguishing agent beads (736).

[0222] At this time, the heat blocking beads (734) and the fire extinguishing beads (736) are mixed inside the receiving space, and the heat blocking beads (734) and the fire extinguishing beads (736) can be mixed in a weight ratio of 6:3 to 8:5, preferably 7:4.

[0223] Meanwhile, the tube (732) is made of a synthetic resin material such as polypropylene (PP), and forms a space therein for accommodating the heat-blocking beads (734) and the fire extinguishing beads (736), and may be formed in a stick shape with a circular or oval cross-section, with both ends closed, and a length direction in one direction. Of course, the present invention is not limited to the shape of the tube (732), and may be formed in various shapes such as a spherical shape or a tube shape.

[0224] The above battery fire propagation blocking stick (730) can block the heat generated when a fire occurs in a battery cell from being transferred to an adjacent battery cell (10) and simultaneously extinguish the fire when a fire occurs.

[0225] At this time, in the present embodiment, the battery fire propagation blocking stick (730) is disposed in the space between the lead tabs (16) of the adjacent battery cells (10) among the plurality of battery cells (10), as illustrated in FIG. 19, and may be disposed to have a longitudinal direction parallel to the short side (24) of the battery cell (10). At this time, the length of the battery fire propagation blocking stick (730) may be longer than the length of the lead tab (16) and equal to or shorter than the length of the short side (24) of the battery cell (10).

[0226] The short end (24) where the lead tab (16) of the battery cell (10) is located is a leakage risk area, and there is a risk that a fire will start in the short end (24) which is a leakage risk area. Therefore, the battery fire propagation blocking stick (730) is placed in the leakage risk area to immediately extinguish the fire at the initial stage.

[0227]

[0228] (a) of FIG. 19 is a drawing showing a state before a fire occurs in a battery cell (10) when the battery fire propagation blocking stick (730) of the present embodiment is positioned at a short side (24) of the battery cell (10), and (b) of FIG. 19 is a drawing showing a deformed battery fire propagation blocking stick (730) when a fire occurs in the battery cell (10).

[0229] As shown in (a) of Fig. 19, in a state where no fire has occurred, the battery fire propagation blocking stick (730) is placed between the battery cells (10), and the heat blocking beads (734) and the fire extinguishing beads (736) are stored in a state of being accommodated within the accommodation space of the tube (732).

[0230] However, as illustrated in (b) of FIG. 19, when a fire occurs due to a gas leak at the short side (24) where the pouch (12) of the battery cell (10) is attached to the lead tab (16), the heat of the fire causes the tube (732) and the heat-blocking beads (734) of the battery fire propagation blocking stick (730) to be heated, and the tube (732) and the heat-blocking beads (734) melt and stick together to form a fused structure (738). At this time, the polypropylene tube (732) melts and acts as an adhesive that sticks the plurality of heat-blocking beads (734) together, so that the heat-blocking beads (734) and the fire extinguishing beads (736) can perform the role of blocking heat while maintaining their position and shape between the battery cells (10) without spilling or flowing out.

[0231] In addition, the fire extinguishing agent beads (736) mixed with the heat blocking beads (734) can perform a fire extinguishing action as the tube (732) melts and is exposed to the atmosphere, and the fire extinguishing agent spreads to the surroundings. At this time, the structure (738) formed by the heat blocking beads (734) and the molten tube (732) being entangled with each other supports the fire extinguishing agent beads (734) so ​​that the fire extinguishing agent beads (734) do not spill out or fall out of their position, and forms a gap through which the fire extinguishing agent is sprayed or scattered from the fire extinguishing agent beads (734) into the atmosphere or flame, so that the fire extinguishing agent beads (734) can perform a fire extinguishing action.

[0232] Of course, the above-mentioned battery fire propagation blocking stick (730) may be formed not only by the fire extinguishing agent beads (736) and heat blocking beads (734) in the form of beads, but may also apply a cured material containing the aforementioned fire extinguishing agent and a binder resin such as silicone or a urethane binder resin within the tube (732). In addition, the cured material may be cured using a liquid curing method.

[0233]

[0234] Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

Claims

1. One or more battery cells; A casing accommodating the plurality of battery cells; A fire extinguishing layer having a fire extinguishing material applied to an inner surface of the casing facing the battery cell, the surface facing the leakage risk area of ​​the battery cell; A battery module having a digestive layer formed therein.

2. In paragraph 1, The above battery cell, electrode; A pouch that forms a pocket that accommodates the electrode and the electrolyte, wraps the electrode and protects it from the outside, 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 are formed integrally and overlap each other while being folded to form a sealing portion that is mutually joined at the outer edge of the pocket; A lead tab extending from the electrode to the outside of the pouch; Including, The above sealing portion includes a pair of short sides on the side where the lead tab is located and a pair of long sides that are orthogonal to the short sides and longer than the short sides. The above leakage risk area is a battery module in which a fire extinguishing layer is formed, which is the central area of ​​the side facing the folding side among the above long sides.

3. In paragraph 2, The above digestion layer is formed on the entire surface of the casing facing the leakage risk area of ​​the battery cell, or a plurality of first straps formed in the form of lines along the long sides at positions facing the long sides where the leakage risk area of ​​each battery cell is formed on the surface of the casing facing the leakage risk area of ​​the battery cell; A battery module comprising a digestion layer formed therein.

4. In paragraph 3, A battery module having a fire extinguishing layer formed at a position facing the leakage risk area of ​​the first strap with a thickness thicker than the rest.

5. In paragraph 4, A battery module having a fire extinguishing layer formed thereon, comprising a second strap applied in a line shape that is orthogonal to the first strap and crosses the middle portion of the plurality of first straps.

6. In paragraph 2, A battery module having a fire extinguishing layer formed thereon, the fire extinguishing layer further including a heat transfer prevention capsule containing a heat transfer prevention material and a fire extinguishing material, the heat transfer prevention capsule being positioned in a space between lead tabs of adjacent battery cells among the plurality of battery cells.

7. In paragraph 6, The above heat transfer prevention capsule is, Outer shell made of synthetic resin; A fire extinguishing agent bead filled within the above outer shell and formed of a fire extinguishing agent; A battery module comprising a digestion layer formed therein.

8. In paragraph 1, The above battery cell, A can with one end open and an internal storage space formed; An electrode accommodated inside the can; A cover that seals the open end of the can and has a vent hole formed through which gas inside the can is discharged; The above leakage risk area is the end where the cover is located, and the battery cells arranged in the casing are arranged so that the leakage risk area all faces the upper side of the casing. A battery module having a fire extinguishing layer formed on an inner surface of a fire cover sheet that covers the upper side of a battery cell arranged in the casing, facing the inner side of the casing.

9. In paragraph 8, A battery module in which the fire extinguishing layer is formed on the entire inner surface of the fire cover sheet, or in which the fire extinguishing layer includes a plurality of third straps applied in a line shape having a longitudinal direction along the direction in which the battery cells of the fire cover sheet are arranged.

10. A tube made of synthetic resin material forming a receiving space having a longitudinal direction in one direction inside; A fire extinguishing agent bead, which is accommodated inside the accommodation space formed by the above tube and includes a fire extinguishing agent for extinguishing a fire; Battery fire propagation blocking stick containing.

11. In paragraph 10, The above tube, A battery fire propagation blocking stick comprising an outer shell and an inner shell formed in an inward direction of the receiving space from the outer shell, wherein a gas layer is formed between the outer shell and the inner shell.

12. In paragraph 11, The above tube is placed between the battery cells in the casing of a battery module having a plurality of battery cells, A battery fire propagation blocking stick, wherein the outer shell is inflated and fixed so as to be in close contact with the adjacent battery cells by the gas layer.

13. In paragraph 10, A battery fire propagation blocking stick further comprising a heat-blocking bead that is accommodated within a receiving space formed by the outer shell and is melted by heat applied in the event of a battery fire and is mutually fused with the outer shell to form a structure that supports the shape, thereby blocking the transfer of heat.

14. Multiple pouch-shaped battery cells; A casing accommodating the plurality of battery cells; A battery fire propagation blocking stick comprising a tube made of synthetic resin material, which is arranged between the battery cells and forms a receiving space, and a fire extinguishing agent bead that is received inside the receiving space and extinguishes a fire; A battery module comprising a battery fire propagation blocking stick, comprising:

15. In paragraph 14, The above battery cell, electrode; A pouch that forms a pocket that accommodates the electrode and the electrolyte, wraps the electrode and protects it from the outside, 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 are formed integrally and overlap each other while being folded to form a sealing portion that is mutually joined at the outer edge of the pocket; A lead tab extending from the electrode to the outside of the pouch; Including, The above sealing portion includes a pair of short sides on the side where the lead tab is located and a pair of long sides that are perpendicular to the short sides and are longer than the short sides. The above battery fire propagation blocking stick is, The plurality of battery cells are arranged between lead tabs or between long sides so as to have the same length direction as the length direction of the short side of the battery cell in the pouch shape. A battery module having a battery fire propagation blocking stick, comprising: a filler that is filled between the battery fire propagation blocking stick and the battery cell to fix the battery fire propagation blocking stick within the casing and absorb vibration transmitted from the outside;

Images