JP7454067B2 - Battery pack with fire extinguishing film containing fire extinguishing microcapsules - Google Patents

Description

The present invention relates to a battery pack, and more specifically, the present invention relates to a battery pack that can be easily installed in an extremely small space formed when a plurality of cylindrical secondary batteries are arranged, without affecting the performance or arrangement of the batteries. The present invention relates to a battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules that can actively suppress the occurrence of abnormal battery heat generation or fire at an early stage.

In recent years, with the commercialization of high-output secondary batteries that use high-energy density non-aqueous electrolytes, they are being used not only in portable devices but also in medium- and large-sized devices such as electric vehicles that require large amounts of power. Research and development in related fields is being actively carried out to make this possible.

Such secondary batteries not only have the advantage of dramatically reducing the use of fossil fuels, but also are environmentally friendly and improve energy efficiency because they do not generate any by-products due to energy use. is attracting attention as a new power source for

Types of secondary batteries that are currently widely used include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries, which are applied to devices that require high output voltages such as electric vehicles. In order to do this, a battery pack is sometimes constructed by connecting a plurality of secondary batteries.

The above-mentioned battery packs mainly use cylindrical secondary batteries in cell units, but the voltage of the cylindrical secondary batteries in such battery packs may drop due to short circuits or overdischarge of the electrodes. If the battery rises rapidly, the battery may catch fire, and if it is overcharged, the positive and negative electrodes may become thermally unstable depending on the state of charge, which may cause a fire due to a rapid exothermic reaction. .

However, installing a separate protection circuit or fire extinguishing means in the battery pack itself is not only extremely difficult, considering the pack structure where secondary batteries are packed together and there is almost no usable space. Because it does not fit with the current trend of reducing manufacturing costs, it can be easily installed in a very small space inside a battery pack, and has the advantage of being able to proactively respond in the early stages in the event of abnormal heat generation or fire in a secondary battery. There is a need to come up with a plan.

Korean Patent Publication No. 10-2009-0026648 Korean Patent Publication No. 10-2015-0003779

The present invention has been made to solve the problems of the prior art as described above, and it is possible to easily install the batteries in a very small space formed when arranging a plurality of cylindrical secondary batteries. The purpose is to provide a battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules that can actively suppress the occurrence of abnormal battery heat generation or fire without affecting the performance or arrangement of the battery. There is.

In order to achieve the above object, the present invention provides a cylindrical secondary battery in which a positive electrode protrudes from one side and a negative electrode is formed flat on the other side, and a plurality of cylindrical secondary batteries arranged horizontally and The case is characterized by comprising a case for forming a certain space while accommodating the case in the vertical direction, and a fire extinguishing film containing fire extinguishing microcapsules and disposed in a certain space in the case in the form of a flexible film. do.

Here, the fire extinguishing film contains a core which is a fire extinguishing agent that exists in a liquid phase at room temperature and changes to a gas phase at a temperature of 30 to 300°C, a polymer resin, a precipitant, and a coagulant, and A fire extinguishing microcapsule composed of a shell surrounding a core with a thickness of ~2000 nm, and a polymer composition in which the fire extinguishing microcapsule is dispersed and can be formed into a film form. .

Further, the fire extinguishing film penetrates through the positive electrode of the cylindrical secondary battery, is held on one side, and is placed in the space between the positive electrode and one side. A first through-hole is formed for simultaneously passing the positive electrodes of a plurality of cylindrical secondary batteries having a ring shape or located within the case, and a space between the plurality of positive electrodes and one side surface. A second through hole is formed to cover the space between the cylindrical secondary batteries and simultaneously expose the negative electrodes of multiple cylindrical secondary batteries located in the case to the outside. It is characterized by covering a space of

Alternatively, the fire extinguishing film may be arranged in the form of partition walls in the space along the length direction between the plurality of cylindrical secondary batteries, or may be arranged in the form of partition walls in the horizontal and vertical directions to form a lattice shape. , are individually arranged so as to surround the outer periphery along the length direction of the cylindrical secondary battery.

On the other hand, the polymer composition includes polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonate, (meth)epoxy Polymer, epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidene diphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1-C10 alkylate (CH2CH-OC(O)R, R is C1-C10 alkyl), vinyl C1-C10 alkyl ether, vinyl pyrrolidone, vinyl carbazole, acrylic acid, acrylonitrile, acrylamide, C1-C10 alkyl acrylate, methacrylic acid, methacrylonitrile , methacrylamide, C1 to C10 alkyl methacrylate, and silicone rubber.

Further, the precipitant is characterized in that it contains one or more selected from the group consisting of potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, and sodium thiocyanate. do.

Further, the coagulant is characterized in that it contains one or more selected from the group consisting of zinc hydroxide and iron hydroxide.

Furthermore, the polymer composition is characterized in that it contains a powdered heat insulating material component.

A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules according to the present invention as described above can have the following effects.
1. A fire extinguishing film having a fire extinguishing function can be easily installed in a very small space inside a battery pack, for example, a space between a plurality of cylindrical secondary batteries, a space between a case and a secondary battery, etc.
2. Since there is no need to change the arrangement of cylindrical secondary batteries or the conventional case structure to install the fire extinguishing film, it can be applied immediately to ready-made devices.
3. When abnormal heat generation or fire occurs in the cylindrical secondary battery in the battery pack, it can react immediately at the initial stage to lower the temperature of the heat generation and extinguish the fire. 4. Simply applying a relatively low-cost fire extinguishing film to the battery pack without creating a separate space can solve the problem of heat generation and fire, making it economical and stable, and allows for miniaturization and weight reduction. You can make battery packs.

1 is a diagram schematically showing a battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules according to the present invention. FIG. 2 is a diagram showing a battery pack including a fire extinguishing film containing fire extinguishing microcapsules according to the present invention, in which an O-ring structure fire extinguishing film is applied. FIG. 3 is a diagram showing a state in which a fire extinguishing film having a positive electrode cover sheet structure is applied in a battery pack including a fire extinguishing film containing fire extinguishing microcapsules according to the present invention. FIG. 2 is a diagram showing a state in which a fire extinguishing film having a negative electrode cover sheet structure is applied in a battery pack including a fire extinguishing film containing fire extinguishing microcapsules according to the present invention. FIG. 2 is a diagram showing a battery pack including a fire extinguishing film containing fire extinguishing microcapsules according to the present invention, in which a fire extinguishing film having a partition wall structure is applied. FIG. 2 is a diagram showing a battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules according to the present invention, in which a fire extinguishing film with a battery wrapping structure is applied.

The terms and words used in this specification and the claims are not limited to their ordinary or dictionary meanings, and the inventors have used appropriate concepts of the terms to best describe their invention. It shall be interpreted according to the meaning and concept consistent with the technical idea of the present invention in accordance with the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention. There are a wide variety of equivalents and variations that can be substituted for these.

Hereinafter, a battery pack including a fire extinguishing film containing fire extinguishing microcapsules according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram schematically showing a battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules according to the present invention.

The present invention basically includes a cylindrical secondary battery 10, a case 20, and a fire extinguishing film 30.

More specifically, the present invention provides a cylindrical secondary battery 10 in which a positive electrode 11 protrudes from one side and a negative electrode 12 is formed flat on the other side, and a plurality of cylindrical secondary batteries 10 are arranged horizontally and The case 20 includes a case 20 for forming a predetermined space while accommodating the case 20 in the vertical direction, and a fire extinguishing film 30 containing fire extinguishing microcapsules and disposed in the predetermined space in the case 20 in the form of a flexible film.

The cylindrical secondary battery 10 converts external electrical energy into chemical energy, stores it, and generates electricity when needed. It can be recharged many times and is currently widely used. Secondary batteries that are used include lead-acid batteries, nickel-cadmium batteries (NiCd), nickel-metal hydride batteries (Ni-MH), lithium-ion batteries (Li-ion), and lithium-ion polymer batteries (Li-ion polymer). However, as is conventionally known, it has a structure in which the body is cylindrical and a protruding positive electrode is provided at the center of one side, and a flat negative electrode is provided on the other side. , 18650 (industrial standard), 21700, etc. according to size.

The case 20 accommodates a plurality of cylindrical secondary batteries 10 to constitute a battery pack, and is electrically connected to the positive electrode 11 and negative electrode 12 of the cylindrical secondary batteries 10, respectively, although not shown. It may include a bus bar (Bus Bar) and a terminal for outputting the power transmitted through the bus bar to the outside, or it may simply be used to connect the cylindrical secondary battery 10 to an external bus bar or terminal. It may have a structure in which a hole is formed, or it may have a separate structure in which the cylindrical secondary battery 10 is placed in the lower part and then combined with the upper part. It is preferable that various shapes can be deformed so that the power supplied through 10 is outputted to the outside.

The fire extinguishing film 30 contains a core which is a fire extinguishing agent that exists in a liquid phase at room temperature and changes to a gas phase at a temperature of 30 to 300°C, and a polymer resin/precipitant/coagulant, and has a diameter of 50 to 2000 nm. A fire extinguishing microcapsule consisting of a shell surrounding a core with a thickness of Placed.

Here, the fire extinguishing microcapsule has a core-shell configuration in which an inner core is surrounded by an outer shell, the core is a fire extinguishing agent, and the shell is made of a polymer resin. The fire extinguishing agent is contained in an amount of 80 to 97% by weight of the fire extinguishing microcapsules.

Such extinguishing agents include 1,1,1,2,2-Pentafluoroethane (CF ₃ CF ₂ H, HFC-125), 1,1,1,2,3,3,3-Heptafluoropropane (CF ₃ CHFCF ₃ ), Chlorotetrafluoroethane (CHClFCF ₃ ), fluorine compound-based ketone compound, dodecafluoro-2-methylpentan-3-one (FK-5-1-12, CF ₃ CF ₂ C(O)CF(CF ₃ ) ₂ )) , 1-chloro-1,2,2,2-tetrafluoroethane (C ₂ HClF ₄ ), 2-chloro-1,1,1,2-tetrafluoroethane (CHClFCF ₃ , HCFC-124), decafluorocyclohexanone (perfluorocyclohexanone) non), CF ₃ CF ₂ C(O)CF(CF ₃ ) ₂ (-1,1,1,2,4,4,5,5,5-nonafluoro-2-trifluoromethyl-butan-3-one), ( CF ₃ ) ₂ CFC(O)CF(CF ₃ ) ₂ (-1,1,1,2,4,5,5,5,6,6,6,-octafluoro-2,4,-bis(trifluoro) (fluoromethyl)pentan-3-one), CF ₃ CF ₂ C(O)CF ₂ CF ₂ CF ₃ , CF ₃ C(O)CF(CF ₃ ) ₂ , 1,1,1,3,3,4, 4,5,5,6,6,7,7,8,8,8,-hexadodecafluorooctan-2-one (CF ₃ CF ₂ CF ₂ CF ₂ CF ₂ CF ₂ C(O)CF ₃ ), 1,1,1,3,4,4,4,-heptafluoro-3-trifluoromethylbutan-2-one (CF ₃ C(O)CF(CF ₃ ) ₂ ), 1,1,1,2 ,4,4,5,5,-octafluoro-2-trifluoromethylpentan-3-one (HCF ₂ CF ₂ C(O)CF(CF ₃ ) ₂ ), 1,1,1,2,4, 4,5,5,6,6,6,-undecafluoro-2-trifluoromethylhexan-3-one (CF ₃ CF ₂ CF ₂ C(O)CF(CF ₃ ) ₂ ), 1-chloro- , 1,1,3,4,4,4-hexafluoro-3-trifluoromethyl-butan-2-one ((CF ₃ ) ₂ CFC(O)CF ₂ CL), 1,1,1,2, 2,4,4,5,5,6,6,6-dodecafluorohexan-3-one (CF ₃ CF ₂ C(O)CF ₂ CF ₂ CF ₃ ), 1,1,1,5,5, 5,-hexafluoropentane-2-4-dione (CF ₃ C(O)CH ₂ C(O)CF ₃ ), 1,1,1,2,5,6,6,6-octafluoro-2, 5-bis(trifluoromethyl)hexane-3,4-dione ((CF ₃ ) ₂ CFC(O)C(O)C(O)CF(CF ₃ ) ₂ ), 1,1,1,2,2 ,3,3,5,5,6,6,7,7,7,-tetradecafluoroheptan-4-one (CF ₃ CF ₂ CF ₂ C(O)CF ₂ CF ₂ CF ₃ ), 1,1 , 1,3,3,4,4,4-octafluorobutan-2-one (CF ₃ C(O)CF ₂ CF ₃ ), 1,1,2,2,4,5,5,5-octa Fluoro-1-trifluoromethoxy-4-trifluoromethylpentan-3-one (CF ₃ OCF ₂ CF ₂ C(O)CF(CF ₃ ) ₂ ), 1,1,1,2,4,4,5 , 5,6,6,7,7,7,-tridecafluoro-2-trifluoromethylheptan-3-one (CF ₃ CF ₂ CF ₂ CF ₂ C(O)CF(CF ₃ ) ₂ ), etc. Can be used.

In addition, the fire extinguishing agents include perfluorobutane (FC-3-1-10), hydrochlorofluorocarbon admixtures (HCFC-123, HCFC-22, HCFC-124), chlorotetrafluoroethane (HCFC-124), pentafluorocarbon admixtures (HCFC-123, HCFC-22, HCFC-124), Ethane (HFC-125), heptafluoropropane (HFC-227ea), trifluoromethane (HFC-23), hexafluoropropane (HFC-236fa), trifluoroiodo (FIC-13I1), nonflammable/inert gas mixture (eg, N ₂ , Ar, CO ₂ ) and dodecafluoro-2-methylpentan-3-one (FK-5-1-12).

The above-mentioned extinguishing agents function to indirectly reduce surrounding thermal energy to prevent a fire from occurring, or directly to extinguish a fire.

The shell of the fire extinguishing microcapsule encloses the outside of the extinguishing agent, functions to store the extinguishing agent in the encapsulated internal space, and prevents the extinguishing agent from leaking into the atmosphere due to the external environment at room temperature. To ensure weather resistance and airtightness.

Such a shell softens at 100 to 300 degrees Celsius, which is the temperature at which a fire is recognized, and at the same time expands and ruptures with the phase change of the extinguishing agent, injecting the extinguishing agent to the outside and raising the temperature at which the fire is described. It preferably has a thickness of 50 to 2000 nm in order to react in the range of .

Polymer resins forming the shell include polyurethane resin, polyurea resin, polyamide resin, polyester resin, polycarbonate resin, aminoaldehyde resin, melamine resin, polystyrene resin, styrene-acrylate copolymer resin, styrene-methacrylate copolymer resin. Coalescing resins, gelatin or derivatives thereof, polyvinyl alcohol, phenol formaldehyde resins, resorcinol formaldehyde resins, etc. can be used.

In addition, precipitants such as potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, sodium thiocyanate, etc., aluminum sulfate, zinc hydroxide, hydroxide, etc. can be added to the polymer resin. By including a coagulant such as iron, iron chloride, etc., the sorting rate and hardening rate of the microcapsules can be controlled during manufacture.

Through the above-mentioned configuration, a large amount of fire extinguishing microcapsules will not react (burst or leak) due to the durability and airtightness of the shell, but will react simultaneously and explode at a specific temperature (e.g. 100 degrees Celsius or higher). By spraying out the gasified extinguishing agent, the extinguishing agent acts directly on the ignition point of the fire, destroying the four elements of combustion: fuel (combustible material), oxygen (air), heat (ignition source), and It suppresses high-energy fires by interrupting the chain reaction with the heat (ignition source) in the chain reaction.

The polymer composition includes polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonate, (meth)epoxy polymer, Epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidene diphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1-C10 alkylate (CH2CH -OC(O)R, R is C1-C10 alkyl), vinyl C1-C10 alkyl ether, vinyl pyrrolidone, vinyl carbazole, acrylic acid, acrylonitrile, acrylamide, C1-C10 alkyl acrylate, methacrylic acid, methacrylonitrile, methacryl It may be one or more selected from the group consisting of amides, C1 to C10 alkyl methacrylates, and silicone rubbers.

Here, the polymer composition may further include a monofunctional acrylic ester of a monohydric alcohol that has the physical property of adhering to a surface with low surface energy, but examples of such acrylic ester include isooctyl acrylate. , 2-ethylhexyl acrylate, isononyl acrylate, isodecyl acrylate, decyl acrylate, lauryl acrylate, hexyl acrylate, butyl acrylate, octadecyl acrylate, 2-propylheptyl acrylate, and the like.

The fire extinguishing film 30, which is applied by mixing the fire extinguishing microcapsules and the polymeric composition as described above, is easy to adjust the thickness and can be of a non-stick type or a slightly viscous type depending on the selection of the composition. In order to firmly fix the fire extinguishing film 30 to the cylindrical secondary battery 10 or the case 20, one side of the fire extinguishing film 30 may be laminated with double-sided tape or coated with an adhesive. You can also do it.

The polymer composition may contain a powdered heat insulating component, which imparts a heat insulating function to the fire extinguishing film, thereby preventing heat and fire generated in the cylindrical secondary battery 10 from being transferred to other batteries. Insulating materials include glass wool, vermiculite, asbestos, rock wool, perlite, silicic acid, alumina, magnesia, and carbon.

Hereinafter, reference will be made to FIGS. 2 to 6 in which the structure of the fire extinguishing film 30 is applied to a certain space formed through the case 20 and the cylindrical secondary battery 10, and the portion corresponding to A in FIG. This will be explained in detail.

1. O-ring structure (see Figure 2)
- It has a shape that penetrates the positive electrode 11 of the cylindrical secondary battery 10, is held on one side, and is arranged in the space between the positive electrode 11 and one side.
- The positive electrode 11 passes through a through hole formed in the center, and ring-shaped film parts are individually located on each side of the secondary battery 10.
- A conductive member such as a bus bar on the upper surface of the positive electrode 11 of the cylindrical secondary battery 10, which is used to output the power supplied from the secondary battery 10 to the outside, and one side of the secondary battery 10. By positioning the fire extinguishing film in the space, it is possible to provide insulation between one side of the secondary battery 10 and the conductive member using the minimum fire extinguishing film without the need to secure a separate space. When a secondary battery 10 generates heat or a fire occurs at a temperature higher than , it can be extinguished immediately.

2. Positive electrode cover sheet structure (see Figure 3)
- A first through-hole 31 is formed through which the positive electrodes 11 of a plurality of cylindrical secondary batteries 10 located in the case 20 pass simultaneously, and the space between the plurality of positive electrodes 11 and one side surface is connected to the cylindrical shape. The space between the secondary batteries 10 is covered.
- Unlike the O-ring structure that is installed one-on-one on secondary batteries, a plurality of cylindrical secondary batteries 10 can be collectively covered in a sheet form for convenience in construction.
-Similar to the O-ring structure, it is located in the space between the positive electrode 11 and one side in order to provide insulation between one side of the secondary battery 10 and the conductive member.

3. Negative electrode cover sheet structure (see Figure 4)
- A second through hole 32 is formed to simultaneously expose the negative electrodes 12 of a plurality of cylindrical secondary batteries 10 located in the case 20 to the outside, and covers the space between the cylindrical secondary batteries 10.
- Considering that the negative electrode 12 usually has a diameter that is approximately the same as the cylindrical diameter of the battery, the second through hole 32 formed in the sheet-like film should also have a size that allows the entire battery to pass through it. is common, and in order to output the power supplied from the secondary battery 10 to the outside, the negative electrode 12 is connected to a conductive member, and the film is positioned entirely on the bottom of the case. Provides a fire extinguishing function when the battery 10 generates heat or a fire occurs.

4. Partition structure (see Figure 5)
- Arranged in the form of a partition in the space along the length direction between the plurality of cylindrical secondary batteries 10 - Taking into account the fact that the fire extinguishing film 30 can be formed thin, it is sandwiched between every 10 secondary batteries. Film installation is possible using this method.
- In this case, the fire extinguishing performance is maximized by arranging the plurality of fire extinguishing films 30 in the form of partition walls in the horizontal and vertical directions to have a grid shape and positioning the films over many spaces. Can be done.

5. Battery wrapping structure (see Figure 6)
- Individually arranged to surround the outer periphery of the cylindrical secondary battery 10 along its length.
- A fire extinguishing film is wrapped around each battery, and since the fire extinguishing film itself has adhesive properties, it can be easily attached without applying adhesive to the film.

The O-ring of the fire extinguishing film, the positive electrode cover sheet, the negative electrode cover sheet, the partition wall, and the battery wrapping structure described above can be selectively or comprehensively adjusted depending on the space of the secondary battery 10 arranged in the case 20. It is applicable in various ways.

In the above description of the present invention with reference to the accompanying drawings, the description has focused on specific shapes and directions; however, the present invention can be variously modified and modified by those skilled in the art, and such modifications and and modifications are included within the scope of the present invention.

A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules according to the present invention as described above can have the following effects.
1. A fire extinguishing film having a fire extinguishing function can be easily installed in a very small space inside a battery pack, for example, a space between a plurality of cylindrical secondary batteries, a space between a case and a secondary battery, etc.
2. Since there is no need to change the arrangement of cylindrical secondary batteries or the conventional case structure to install the fire extinguishing film, it can be applied immediately to ready-made devices.
3. When abnormal heat generation or fire occurs in the cylindrical secondary battery in the battery pack, it can react immediately at the initial stage to lower the temperature of the heat generation and extinguish the fire. 4. Simply applying a relatively low-cost fire extinguishing film to the battery pack without creating a separate space can solve the problem of heat generation and fire, making it economical and stable, and allows for miniaturization and weight reduction. You can make battery packs.

Claims (11)

A cylindrical secondary battery 10 in which a positive electrode 11 protrudes from one side and a negative electrode 12 is formed flat on the other side;
a case 20 for forming a certain space while accommodating the plurality of cylindrical secondary batteries 10 in the horizontal and vertical directions;
a fire extinguishing film 30 containing fire extinguishing microcapsules and disposed in a certain space within the case 20 in the form of a flexible film;
The fire extinguishing film 30 is
The core is a fire extinguishing agent that exists in a liquid phase at room temperature and changes to a gas phase at a temperature of 30 to 300 degrees Celsius, and contains a polymer resin, a precipitant, and a coagulant, and has a core with a thickness of 50 to 2000 nm. A fire extinguishing microcapsule consisting of a wrapping shell;
The fire extinguishing microcapsules are dispersed and composed of a polymer composition that can be formed into a film form.
A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules. The fire extinguishing film 30 penetrates the positive electrode 11 of the cylindrical secondary battery 10 and is held on one side surface, and is placed in the space between the positive electrode 11 and one side surface using an O-ring ( A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1, which has an O-Ring shape. The fire extinguishing film 30 is formed with a first through hole 31 through which the positive electrodes 11 of a plurality of cylindrical secondary batteries 10 located in the case 20 pass simultaneously, and is formed between the plurality of positive electrodes 11 and one side surface. A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1, which covers the space between the space and the space between the cylindrical secondary batteries 10. A cylindrical secondary battery 10 in which a positive electrode 11 protrudes from one side and a negative electrode 12 is formed flat on the other side;
a case 20 for forming a certain space while accommodating the plurality of cylindrical secondary batteries 10 in the horizontal and vertical directions;
a fire extinguishing film 30 containing fire extinguishing microcapsules and disposed in a certain space within the case 20 in a flexible film form;
The fire extinguishing film 30 is formed with a second through hole 32 for simultaneously exposing the negative electrodes 12 of a plurality of cylindrical secondary batteries 10 located in the case 20 to the outside, and a space between the cylindrical secondary batteries 10 is formed. cover
A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules. A cylindrical secondary battery 10 in which a positive electrode 11 protrudes from one side and a negative electrode 12 is formed flat on the other side;
a case 20 for forming a certain space while accommodating the plurality of cylindrical secondary batteries 10 in the horizontal and vertical directions;
a fire extinguishing film 30 containing fire extinguishing microcapsules and disposed in a certain space within the case 20 in a flexible film form ;
The fire extinguishing film 30 is arranged in the form of a partition in a space along the length direction between the plurality of cylindrical secondary batteries 10,
The plurality of fire extinguishing films 30 are arranged in the form of partition walls in the horizontal and vertical directions to form a grid shape.
A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules. A cylindrical secondary battery 10 in which a positive electrode 11 protrudes from one side and a negative electrode 12 is formed flat on the other side;
a case 20 for forming a certain space while accommodating the plurality of cylindrical secondary batteries 10 in the horizontal and vertical directions;
a fire extinguishing film 30 containing fire extinguishing microcapsules and disposed in a certain space within the case 20 in a flexible film form ;
The fire extinguishing film 30 is individually arranged to surround the outer periphery of the cylindrical secondary battery 10 along the length direction.
A battery pack equipped with a fire extinguishing film containing fire extinguishing microcapsules. The polymer composition includes polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonate, (meth)epoxy polymer, Epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidene diphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1-C10 alkylate (CH2CH -OC(O)R, R is C1-C10 alkyl), vinyl C1-C10 alkyl ether, vinyl pyrrolidone, vinyl carbazole, acrylic acid, acrylonitrile, acrylamide, C1-C10 alkyl acrylate, methacrylic acid, methacrylonitrile, methacryl One or more selected from the group consisting of amide, C1 to C10 alkyl methacrylate, and silicone rubber.
A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1 . The precipitating agent includes one or more selected from the group consisting of potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, and sodium thiocyanate.
A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1 . The coagulant includes one or more selected from the group consisting of zinc hydroxide and iron hydroxide.
A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1 . The polymer composition contains a powdered heat insulating material component.
A battery pack comprising a fire extinguishing film containing the fire extinguishing microcapsules according to claim 1 . A battery pack comprising a fire extinguishing film containing fire extinguishing microcapsules according to claim 1, wherein one side of the fire extinguishing film 30 is laminated with double-sided tape or coated with an adhesive.

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