WO2021194059A1

WO2021194059A1 - Battery pack provided with fire-extinguishing film containing microcapsules for extinguishing fires

Info

Publication number: WO2021194059A1
Application number: PCT/KR2020/019257
Authority: WO
Inventors: 이상섭; 김창홍
Original assignee: 주식회사 지에프아이
Priority date: 2020-03-25
Filing date: 2020-12-29
Publication date: 2021-09-30
Also published as: JP7454067B2; KR102149439B1; JP2023520860A; CN115428245A

Abstract

The present invention relates to a battery pack, and more particularly, to a battery pack which is provided with a fire-extinguishing film containing microcapsules for extinguishing fires. The fire-extinguishing film may be conveniently installed in a minimal space formed when a plurality of cylindrical secondary batteries are arranged, but does not have any effect on the performance or arrangement of the batteries, and can actively suppress, at an early stage, abnormal heat generation or fire that occurs in the batteries. To this end, the present invention is characterized by comprising: cylindrical secondary batteries (10), each having a positive electrode (11) protruding from one side surface and a negative electrode (12) formed flat on the other surface; a case (20) for forming a certain space while horizontally and vertically accommodating the plurality of cylindrical secondary batteries (10); and a fire-extinguishing film (30) which contains microcapsules for extinguishing fires and is disposed, in the form of a flexible film, in the certain space within the case (20).

Description

Battery pack with fire extinguishing film containing microcapsules for fire extinguishing

The present invention relates to a battery pack, and more specifically, to a battery pack that can be easily installed in a very small space formed when a plurality of cylindrical secondary batteries are arranged, does not have any effect on battery performance or arrangement, and is actively It relates to a battery pack equipped with a fire extinguishing film containing microcapsules for fire extinguishing that can be suppressed by

In recent years, as high-power secondary batteries using non-aqueous electrolytes with high energy density have been commercialized, research and development in related fields has been actively conducted so that they can be used not only in portable devices but also in medium-to-large devices such as electric vehicles that require large power.

These secondary batteries are attracting attention as a new power source for improving energy efficiency while being eco-friendly in that not only can the use of fossil fuels be dramatically reduced, but also no by-products are generated from the use of energy.

The types of secondary batteries currently widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and the like. A battery pack is also formed by connecting batteries.

In the above-described battery pack, cylindrical secondary batteries are mainly used in units of cells. In such a cylindrical secondary battery in the battery pack, if the voltage rapidly rises due to a short circuit or overdischarge of an electrode part, the battery may ignite and overcharge. Depending on the state of charge, the anode and cathode become thermally unstable, causing a fire due to a rapid exothermic reaction.

However, it is very difficult to install a separate protection circuit or fire extinguishing means in the battery pack itself considering the pack structure that has little space for use due to the concentration of secondary batteries, and it also meets the current trend of downsizing the battery pack and reducing manufacturing costs. For this reason, it is necessary to prepare an effective method that can be easily installed in a very small space in the battery pack to actively respond to abnormal heat or fire in the secondary battery at an early stage.

[Prior art literature]

[Patent Literature]

(Patent Document 1) Republic of Korea Patent Publication No. 10-2009-0026648

(Patent Document 2) Republic of Korea Patent Publication No. 10-2015-0003779

The present invention has been devised to solve the problems of the prior art, and while it can be easily installed in a very small space formed when a plurality of cylindrical secondary batteries are arranged, it does not have any effect on the battery performance or arrangement, and abnormal heat or fire of the battery occurs It is an object of the present invention to provide a battery pack equipped with a fire extinguishing film containing microcapsules for fire extinguishing that can be actively suppressed in the initial stage.

In order to achieve the above object, the present invention, a cylindrical secondary battery in which a positive electrode protrudes from one side and a negative electrode is formed flat on the other side; a case for accommodating the plurality of cylindrical secondary batteries in horizontal and vertical directions while forming a predetermined space; It contains a fire extinguishing microcapsule, and a fire extinguishing film disposed in a predetermined space in the case in the form of a flexible film; characterized in that it comprises a.

Here, the fire extinguishing film consists of a core which is a fire extinguishing agent that is phase-changed to a gaseous phase at a temperature of 30 to 300 ° C while being in a liquid state at room temperature, and a shell containing a polymer resin, a precipitating agent and a coagulant and enclosing the core to a thickness of 50 to 2000 nm. earthquake extinguishing microcapsules; It is characterized in that it is composed of a polymer composition in which the microcapsules for digestion are dispersed and moldable into a film form.

In addition, the fire extinguishing film has an O-Ring shape to pass through the positive electrode of the cylindrical secondary battery and is seated on one side and disposed in the space between the positive electrode and one side, or a plurality of cylindrical secondary batteries positioned in the case A first through hole for allowing the positive electrodes to pass simultaneously is formed to cover a space between a plurality of positive electrodes and one side and a space between a cylindrical secondary battery, or to simultaneously expose a plurality of negative electrodes of a cylindrical secondary battery positioned in a case to the outside A second through hole is formed and characterized in that it covers the space between the cylindrical secondary batteries.

Alternatively, the fire extinguishing film is arranged in the form of a barrier rib in the space along the longitudinal direction between the plurality of cylindrical secondary batteries, or is arranged in the form of barrier ribs in the horizontal and vertical directions to form a lattice shape, or individually in the longitudinal direction of the cylindrical secondary cells. It is characterized in that it is arranged so as to surround the outer periphery.

On the other hand, the polymer composition is polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonic acid, (meth ) Epoxy polymer, epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidenediphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1~C10 alkylate (CH2CH-OC(O)R, R is C1~C10 alkyl), vinyl C1~C10 alkyl ether, vinylpyrrolidone, vinylcarbazole, acrylic acid, acrylonitrile, acrylamide, C1 ~ C10 alkyl acrylate, methacrylic acid, methacrylonitrile, methacrylamide, C1 ~ C10 It is characterized in that at least one selected from the group consisting of alkyl methacrylate and silicone rubber.

In addition, the precipitating agent is characterized in that it comprises at least one selected from the group consisting of potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, and sodium thiocyanate.

In addition, the coagulant is characterized in that it comprises at least one selected from the group consisting of zinc hydroxide and iron hydroxide.

Additionally, the polymer composition is characterized in that it contains a powder-type heat insulating material component.

The battery pack provided with the fire extinguishing film containing the fire extinguishing microcapsule according to the present invention as described above can exhibit the following effects.

1. The fire-extinguishing film with fire extinguishing function can be easily installed in the smallest space placed in the battery pack, for example, in the space between several cylindrical secondary batteries, in the space between the case and secondary batteries, etc.

2. Because there is no need to change the cylindrical secondary battery arrangement or the existing case structure to install the fire extinguishing film, it can be applied immediately to ready-made products.

3. In the event of abnormal heat or fire of the cylindrical secondary battery in the battery pack, it can react immediately at the initial stage to lower the heating temperature or extinguish the fire.

4. It is possible to manufacture a battery pack that is economical/stable and capable of miniaturization and light weight as it can solve heat or fire problems just by applying a relatively inexpensive fire extinguishing film to the battery pack without providing a separate space.

1 is a view schematically showing a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention;

2 is a view showing a state in which an O-ring structure fire extinguishing film is applied among a battery pack equipped with a fire extinguishing film containing a fire extinguishing microcapsule according to the present invention;

3 is a view showing a state in which a fire extinguishing film having a positive electrode cover sheet structure is applied among a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention;

4 is a view showing a state in which a fire extinguishing film with a negative electrode cover sheet structure is applied among a battery pack having a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention;

5 is a view showing a state in which a fire extinguishing film having a bulkhead structure is applied among a battery pack having a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention;

6 is a view showing a state in which a fire extinguishing film with a battery wrapping structure is applied among a battery pack having a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention;

The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention, and does not represent all the technical spirit of the present invention, so they can be substituted at the time of the present application It should be understood that various equivalents and modifications may be made.

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

1 is a view schematically showing a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing according to the present invention.

The present invention is basically configured to include a cylindrical secondary battery (10), a case (20) and a fire extinguishing film (30).

More specifically, the present invention relates to 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 in horizontal and vertical directions. It consists of a case 20 for forming a predetermined space while accommodating it, and a fire extinguishing film 30 containing microcapsules for fire extinguishing and disposed in a 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, and can be recharged multiple times. A battery (NiCd), a nickel-metal hydride battery (Ni-MH), a lithium ion battery (Li-ion), a lithium ion polymer battery (Li-ion polymer), etc. As a result, it has a structure in which a protruding positive electrode is provided in the center of one side and a negative electrode in a flat shape is provided on the other side.

The case 20 accommodates a plurality of cylindrical secondary batteries 10 to constitute a battery pack, and although not shown in the drawing, is electrically connected to the positive electrode 11 and the negative electrode 12 of the cylindrical secondary battery 10 , respectively. A structure in which a hole is formed for simply connecting an external bus bar or terminal to the cylindrical secondary battery 10, which may include a bus bar, which is a bus bar, and a terminal for outputting power transmitted through the bus bar to the outside. may have a separate structure in which the cylindrical secondary battery 10 is disposed on the lower part and then coupled to the upper part, and various other types of power supplied through a plurality of cylindrical secondary batteries 10 are output to the outside. It would be desirable to be interpreted as being capable of shape deformation.

The fire extinguishing film 30 contains a core that is a fire extinguishing agent that phase changes to a gas phase at a temperature of 30 to 300 ° C while being in a liquid state at room temperature, a polymer resin / precipitant / coagulant, and a shell enclosing the core with a thickness of 50 to 2000 nm. After dispersing the fire extinguishing microcapsules made in a polymer composition and then forming it in a film form, the microcapsules are disposed in the space formed by the cylindrical secondary battery 10 and the case 20 .

These extinguishing agents are 1,1,1,2,2-Pent.

Here, the fire extinguishing microcapsule is in the form of a core-shell type in which the inner core is surrounded by an outer shell, the core is a fire extinguishing agent and the shell is made of a polymer resin, and the fire extinguishing agent is 80 to 97 of the fire extinguishing microcapsule. afluoroethane (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), CF 3} CF ₂ C(O)CF(CF ₃ ) ₂ (-1,1,1,2,4,4,5,5,5-nonafluoro-2-trifluoromethyl-butan-3one), (CF ₃ ) ₂ CFC(O)CF(CF ₃ ) ₂ (-1,1,1,2,4,5,5,5,6,6,6,-octafluoro-2,4,-bis(tri 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-octafluorobutal-2-one (CF ₃ C(O)CF ₂ CF ₃ ), 1,1, 2,2,4,5,5,5-octafluoro-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 ) and the like may be used.

In addition, the extinguishing agent is perfluorobutane (FC-3-1-10), hydrochlorofluorocarbon admixtures (HCFC-123, HCFC-22, HCFC-124), chlorotetrafluoroethane (HCFC-124), Pentafluoroethane (HFC-125), heptafluoropropane (HFC-227ea), trifluoromethane (HFC-23), hexafluoropropane (HFC-236fa), trifluoroiodide (FIC-13I1) , a nonflammable/inert gas mixture (eg _{, N 2} , Ar, CO ₂ ) and dodecafluoro-2-methylpentane-3-one (FK-5-1-12) may be used.

The extinguishing agent as described above indirectly reduces the surrounding thermal energy to suppress the fire from occurring or function to put out the fire directly.

The shell of the fire extinguishing microcapsule wraps the outside of the fire extinguishing agent so that the fire extinguishing agent is stored in the encapsulated inner space, and weather resistance and airtightness are ensured to prevent the fire extinguishing agent from leaking into the atmosphere by the external environment at room temperature. .

This shell is softened at 100 ~ 300 ℃ recognized as a fire, and at the same time expands and ruptures with a phase change of the extinguishing agent, thereby injecting the extinguishing agent to the outside, and preferably 50 to react in the described fire temperature range It has a thickness of 2000 nm.

In addition, as the polymer resin forming the shell, polyurethane resin, polyurea resin, polyamide resin, polyester resin, polycarbonate resin, aminoaldehyde resin, melamine resin, polystyrene resin, styrene-acrylate copolymer resin, styrene- A methacrylate copolymer resin, gelatin or a derivative thereof, polyvinyl alcohol, phenol formaldehyde resin, resorcinol formaldehyde resin, and the like may be used.

In addition, the polymer resin contains a precipitating agent such as potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, sodium thiocyanate, or a coagulant such as aluminum sulfate, zinc hydroxide, iron hydroxide, iron chloride, etc. Capsule sorting rate or curing rate can be controlled.

Through the configuration as mentioned above, a large amount of microcapsules for fire extinguishing do not react (rupture, leak) due to the durability and airtightness of the shell, and then react and explode simultaneously at a specific temperature (eg, 100℃ or higher). By ejecting the vaporized extinguishing agent, the extinguishing agent acts directly on the ignition point of the fire, resulting in a chain reaction with fuel (flammables), oxygen (air), heat (ignition source), and heat (ignition source) during the chain reaction, which are the four main conditions of combustion. It is used to extinguish high-energy fires.

The polymer composition is polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonic acid, (meth)epoxy polymer , Epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidenediphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1~C10 alkylate (CH2CH-OC(O)R, R is C1~C10 alkyl), vinyl C1~C10 alkyl ether, vinylpyrrolidone, vinylcarbazole, acrylic acid, acrylonitrile, acrylamide, C1~C10 alkyl It may be at least one selected from the group consisting of acrylate, methacrylic acid, methacrylonitrile, methacrylamide, C1-C10 alkyl methacrylate, and silicone rubber.

Here, the polymer composition may further include a monofunctional acrylic acid ester of a monohydric alcohol having physical properties attached to the surface of low surface energy. Examples of this type of acrylic acid ester include isooctyl acrylate, 2-ethyl hexyl acrylate, It may be at least one selected from the group consisting of isononyl acrylate, isodecyl acrylate, decyl acrylate, lauryl acrylate, hexyl acrylate, butyl acrylate, and octadecyl acrylate, 2-propylheptylacrylate, and the like. .

The fire extinguishing film 30 applied by mixing the microcapsule for fire extinguishing and the polymer composition as described above is easy to control in thickness and can be manufactured in a non-sticky type or a type having some viscosity depending on the composition selection, and is cylindrical. In order to firmly fix the fire extinguishing film 30 to the secondary battery 10 or the case 20, a double-sided tape may be laminated on one side of the fire extinguishing film 30 or an adhesive may be coated.

The polymer composition may contain an insulating material in powder form, which is to prevent the transfer of heat or fire generated in the cylindrical secondary battery 10 to other batteries as much as possible by imparting a thermal insulation function to the fire extinguishing film, Glass wool, vermiculite, asbestos, rock wool, perlite, siliceous material, alumina material, magnesia material, carbonaceous material etc. are mentioned as a heat insulating material component.

Below, with reference to FIGS. 2 to 6, which are enlarged parts corresponding to A of FIG. 1 by applying a fire extinguishing film 30 structure to a predetermined space formed through the case 20 and the cylindrical secondary battery 10, Let's take a look in detail.

1. O-Ring structure (see Fig. 2)

- It has a shape disposed in the space between the positive electrode 11 and the one side while being seated on one side through the positive electrode 11 of the cylindrical secondary battery 10

- The positive electrode 11 penetrates through the hole formed in the center, and the ring-shaped film portion is individually located on each side of the secondary battery 10

- On the upper surface of the positive electrode 11 of the cylindrical secondary battery 10, a fire extinguishing film is located in the space between a conductive member used to output power supplied from the secondary battery 10 to the outside, such as a busbar, and one side of the secondary battery 10 As a result, it is possible to provide insulation between one side of the secondary battery 10 and the conductive member by using a minimum fire extinguishing film without the need to secure a separate space, and at the same time, the secondary battery 10 may be heated or fire over a certain temperature. Enables immediate suppression in case of occurrence

2. Positive electrode cover sheet structure (refer to Fig. 3)

- A first through-hole 31 for passing the positive electrodes 11 of a plurality of cylindrical secondary batteries 10 positioned in the case 20 at the same time is formed, and a space between the plurality of positive electrodes 11 and one side and a cylindrical shape Covers the space between the secondary batteries (10)

- Unlike the O-ring structure, which is installed one-to-one in the secondary battery, it is possible to collectively cover several cylindrical secondary batteries 10 in the form of a sheet for convenience in construction.

- Like the O-ring structure, it is located in the space between the positive electrode 11 and the 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 Fig. 4)

- A second through hole 32 for simultaneously exposing the negative electrodes 12 of the plurality of cylindrical secondary batteries 10 positioned in the case 20 to the outside is formed, and covers the space between the cylindrical secondary batteries 10

- Considering that the negative electrode 12 has a diameter that is almost the same as the cylindrical diameter of the battery, the second through hole 32 formed in the sheet-shaped film generally also has a size such that the battery passes as a whole. , in order to output the power supplied from the secondary battery 10 to the outside, the negative electrode 12 is connected to the conductive member and the film is positioned on the bottom surface of the case as a whole, so that the secondary battery 10 is heated or fire-extinguishing when a fire occurs. will provide

4. Bulkhead structure (refer to Fig. 5)

- Arranged in the form of a partition wall in the space along the longitudinal direction between the plurality of cylindrical secondary batteries (10)

- In consideration of the fact that the fire extinguishing film 30 can be formed thin, the film can be installed by sandwiching it between the secondary batteries 10

- At this time, by disposing a plurality of fire extinguishing films 30 in the form of barrier ribs in the horizontal and vertical directions to have a grid shape, the fire extinguishing performance can be maximized by allowing the films to be positioned in many spaces.

5. Battery wrapping structure (refer to FIG. 6)

- Individually arranged to surround the outer periphery along the longitudinal direction of the cylindrical secondary battery (10)

- Each battery should surround the fire extinguishing film, and since the fire extinguishing film itself has adhesive properties, it can be easily attached without applying an adhesive to the film.

The above-described O-ring, positive electrode cover sheet, negative electrode cover sheet, partition wall, and battery wrapping structure of the fire extinguishing film may be selectively or comprehensively applied according to the situation according to the space of the secondary battery 10 arranged in the case 20. .

In the above description of the present invention with reference to the accompanying drawings, a specific shape and direction have been mainly described, but the present invention can be variously modified and changed by those skilled in the art, and such modifications and changes are included in the scope of the present invention. should be interpreted as

Claims

a cylindrical secondary battery 10 in which the positive electrode 11 protrudes from one side and the negative electrode 12 is flat on the other side;

a case 20 for accommodating the plurality of cylindrical secondary batteries 10 in horizontal and vertical directions while forming a predetermined space;

A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it contains a fire extinguishing microcapsule, and a fire extinguishing film 30 disposed in a predetermined space in the case 20 in the form of a flexible film. .
The method according to claim 1,

The fire extinguishing film 30,

A fire extinguishing microcapsule consisting of a core, which is a fire extinguishing agent that exists as a liquid at room temperature and phase-changes to a gaseous phase at a temperature of 30~300℃, and a shell that contains a polymer resin, a precipitant and a coagulant and surrounds the core with a thickness of 50~2000nm; ;

A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it consists of; a polymer composition in which the microcapsules for fire extinguishing are dispersed and moldable into a film form.
The method according to claim 1,

The fire extinguishing film 30 penetrates the positive electrode 11 of the cylindrical secondary battery 10 and is seated on one side while having an O-Ring shape to be disposed in the space between the positive electrode 11 and one side. A battery pack equipped with a fire extinguishing film containing microcapsules for fire extinguishing.
The method according to claim 1,

The fire extinguishing film 30 is formed with a first through hole 31 for passing the positive electrodes 11 of the plurality of cylindrical secondary batteries 10 positioned in the case 20 at the same time, the plurality of positive electrodes 11 and one A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it covers the space between the sides and the space between the cylindrical secondary battery (10).
The method according to claim 1,

The fire extinguishing film 30 is formed with a second through hole 32 for simultaneously exposing the negative electrode 12 of the plurality of cylindrical secondary batteries 10 positioned in the case 20 to the outside, and the cylindrical secondary battery 10 . A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it covers the space between them.
The method according to claim 1,

The fire extinguishing film 30 is a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it is arranged in the form of a partition in the space along the longitudinal direction between the plurality of cylindrical secondary batteries (10).
7. The method of claim 6,

A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that the plurality of fire extinguishing films 30 are arranged in the form of barrier ribs in the horizontal and vertical directions to form a lattice shape.
The method according to claim 1,

The fire extinguishing film 30 is a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that the fire extinguishing film 30 is individually arranged to surround the outer periphery along the longitudinal direction of the cylindrical secondary battery 10.
3. The method according to claim 2,

The polymer composition is polypropylene, (meth)acrylic polymer, (meth)acrylic monomer, 2-ethylhexyl acrylate (2eha), butyl acrylate, isooctyl acrylate, cellulose, polybisphenol A carbonic acid, (meth)epoxy polymer , Epoxy monomer, Poly(ethylene-co-propylene-co-5-methylene-2-norbornene), 4,4'-isopropylidenediphenol, vinyl chloride, vinylidene chloride, tetrafluoroethylene, vinyl C1~C10 alkylate (CH2CH-OC(O)R, R is C1~C10 alkyl), vinyl C1~C10 alkyl ether, vinylpyrrolidone, vinylcarbazole, acrylic acid, acrylonitrile, acrylamide, C1~C10 alkyl A fire extinguishing film containing microcapsules for fire extinguishing, characterized in that at least one selected from the group consisting of acrylate, methacrylic acid, methacrylonitrile, methacrylamide, C1-C10 alkyl methacrylate and silicone rubber is provided old battery pack.
3. The method according to claim 2,

The precipitating agent comprises at least one selected from the group consisting of potassium acetate, sodium citrate, sodium chloride, ammonium chloride, sodium iodide, potassium iodide, copper sulfate, and sodium thiocyanate. .
3. The method according to claim 2,

The coagulant comprises at least one selected from the group consisting of zinc hydroxide and iron hydroxide.
3. The method according to claim 2,

The polymer composition is a battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that it contains a powder-type heat insulating material.
The method according to claim 1,

A battery pack provided with a fire extinguishing film containing microcapsules for fire extinguishing, characterized in that one surface of the fire extinguishing film 30 is laminated with a double-sided tape or coated with an adhesive.