JP2021132011A - Fire extinguishing coating material and packing material for secondary batteries using the same - Google Patents

Abstract

To provide a fire extinguishing coating material that enables safe and inexpensive storage and transportation of a secondary battery that may cause a fire or explosion, and a packing material for a secondary batteries using this fire extinguishing coating material.SOLUTION: A fire extinguishing coating material that wraps a secondary battery 10 for usage and extinguishes the secondary battery 10 when a fire breaks out from the secondary battery 10 includes a fire extinguishing bag 26 filled with a fire extinguishing agent 24, and the fire extinguishing bag 26 is a compound that is made of a synthetic resin sheet in which a damaged port is formed by the heat of the fire, and in which the fire extinguishing agent 24 is a liquid at 25°C (normal temperature), and has fire extinguishing action having a boiling point of 75°C or lower.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fire extinguishing coating material that quickly extinguishes the secondary battery when a fire breaks out from the secondary battery and a packing material for the secondary battery using the fire extinguishing coating material. be.

Lithium-ion batteries can fail due to manufacturing, storage or use problems. Such lithium-ion batteries need to be sent back to the manufacturer's company.

Lithium-ion batteries store a large amount of electrical energy and are made of flammable organic substances, so defective lithium-ion batteries may catch fire or explode during storage or transportation. There is.

If a lithium-ion battery catches fire or explodes during storage or transportation, the fire or explosion is not enough, but the flames generated by the fire or explosion spread the fire of other luggage carried with it, causing a car fire. May cause.

If there are multiple or large numbers of lithium-ion batteries to be stored or transported, even if one lithium-ion battery ignites or explodes, other lithium-ion batteries will be detonated, and the scale of the lithium-ion battery's fire or explosion will increase. It grows larger and is more likely to cause a car fire.

If a car causes a fire while driving, it can cause not only traffic jams but also other major accidents. In particular, if you cause a car fire while driving in a tunnel, it may involve other cars and cause a catastrophe.

Therefore, in order to prevent such a problem, it has been proposed to use a sturdy metal container when storing or transporting the lithium ion battery. However, a sturdy metal special container is quite heavy, and there is a problem that it imposes an excessive burden on the worker who handles this special container.

Moreover, there is also a problem that it costs a considerable amount of money for the transportation company to stock a large number of sturdy metal dedicated containers.

It is conceivable to store or transport the lithium-ion battery to be sent back alone so as not to spread the fire of other luggage, but doing so would make the storage and transportation costs too high.

Moreover, at present, there are no legal restrictions on the storage and transportation of lithium-ion batteries, so lithium-ion batteries are stored and transported in ordinary luggage without any protective measures against fires and explosions. This seems to be the case, and the safety of storage and transportation of lithium-ion batteries is being questioned.

WO2018 / 047762A

The problem to be solved by the present invention is a fire extinguishing coating material for safely and inexpensively storing and transporting a secondary battery having a possibility of fire or explosion, and a secondary battery using this fire extinguishing coating material. It is to provide packing materials for use.

One invention of the present application is to wrap a secondary battery and use it to extinguish the secondary battery when a fire breaks out from the secondary battery, and has a fire extinguishing bag filled with a fire extinguishing agent. The fire extinguishing bag is a fire extinguishing coating material made of a synthetic resin sheet in which a damaged opening is formed by the heat of the fire.

Another invention of the present application includes the fire extinguishing coating material and a transport container for storing or transporting a package formed by wrapping the secondary battery with at least the fire extinguishing coating material. It is a packing material for secondary batteries.

Here, as the fire extinguishing agent, a compound having a liquid at 25 ° C. (room temperature) and a fire extinguishing action having a boiling point of 75 ° C. or lower is preferable. If the compound is liquid at 25 ° C (normal temperature), the heated secondary battery can be cooled by immersing it in a liquid fire extinguishing agent, and if the compound has a boiling point of 75 ° C or less, it is easily vaporized by the heated secondary battery. Therefore, the secondary battery can be cooled by the heat of vaporization. Examples of such a compound include a compound represented by the chemical formula of _{CF 3} CF ₂ C (O) CF (CF ₃ ) _2.

Further, as the synthetic resin sheet, a thermoplastic resin sheet may be simply used, but a sheet having a structure in which a gas barrier layer is laminated on a thermoplastic resin layer is preferable. This is because the structure in which the gas barrier layer is laminated can prevent the vaporized fire extinguishing agent from permeating through the fire extinguishing bag and escaping to the outside of the fire extinguishing bag. The synthetic resin on the inner surface side of the fire extinguishing bag is preferably a synthetic resin made of a material that is durable against the fire extinguishing agent.

As the material of the thermoplastic resin layer, any synthetic resin whose breakage port is easily formed by the heat of the fire may be used. For example, polyethylene resin, polypropylene resin or other polyolefin resin or nylon can be used. Examples of the material of the gas barrier layer include ethylene vinyl alcohol copolymer (EVOH), but other synthetic materials as long as they have a high ability to shield the permeation of the fire extinguishing agent. Resin may be used.

The thickness of the thermoplastic resin layer is preferably 0.03 mm to 0.15 mm. If the thickness of the thermoplastic resin layer is less than 0.03 mm, there is a problem that the fire extinguishing bag filled with the fire extinguishing agent is easily physically damaged. If the thickness of the thermoplastic resin layer exceeds 0.15 mm, there is a problem that it becomes difficult for the fire extinguishing bag to quickly form a damaged port due to the heat of the fire. This is because these problems do not occur when the thickness of the thermoplastic resin layer is 0.03 mm to 0.15 mm.

The thickness of the gas barrier layer is preferably 0.001 mm to 0.05 mm. If the thickness of the gas barrier layer is less than 0.001 mm, there is a problem that the amount of the fire extinguishing agent permeating and escaping from the fire extinguishing bag increases. If the thickness of the gas barrier layer exceeds 0.05 mm, there is a problem that it becomes difficult for the fire extinguishing bag to quickly form a damaged port due to the heat of the fire. This is because these problems do not occur when the thickness of the gas barrier layer is 0.001 mm to 0.05 mm.

The laminated synthetic resin sheet preferably has a structure in which the inside of the fire extinguishing bag is a gas barrier layer and the outside of the fire extinguishing bag is a thermoplastic resin layer. When the fire extinguishing bag is in physical contact from the outside, the thermoplastic resin layer protects the gas barrier layer, so that the gas barrier layer is not easily scratched, and the fire extinguishing agent permeates the fire extinguishing bag to the outside. This is because it is difficult to leak to.

Further, as the synthetic resin sheet having a laminated structure, it is more preferable that the gas barrier layer is sandwiched between the thermoplastic resin layer and other synthetic resin layers. Since the thermoplastic resin layer and other synthetic resin layers protect the gas barrier layer from the front and back surfaces, the gas barrier layer is more resistant to damage, and the gas of the fire extinguishing agent permeates the fire extinguishing bag to the outside. This is because it becomes more difficult to escape.

As the shape of the fire extinguishing coating material, a substantially mat-like shape or a substantially bag-like shape can be adopted. The mat shape refers to a shape in which a plurality of fire extinguishing bags are continuously connected in a substantially plate shape in the longitudinal direction. If the shape of the fire extinguishing coating material is substantially mat-shaped or substantially bag-shaped, it is easy to store and surround the secondary battery.

The packing material for a secondary battery according to the present invention may include a storage box for storing the secondary battery wrapped in the fire extinguishing coating material. The storage box is preferably made of a nonflammable material that has some strength and is light, such as aluminum. As the size of the storage box, for example, 190 mm × 130 mm × 50 mm can be exemplified, but the size of the storage box is arbitrary and is not limited to this size.

The packaging material for a secondary battery according to the present invention may include a fireproof bag for wrapping the storage box. The fire protection bag is preferably formed of spatter felt. This is because spatter felt has high fire resistance. The spatter felt preferably has a thickness of about t = 5 mm, but the thickness of the fire protection bag is arbitrary and is not limited to this thickness.

The packing material for a secondary battery according to the present invention may include a gas holding bag for wrapping the fire protection bag. A polypropylene bag can be used as the gas holding bag. A polypropylene bag having a capacity of about 20 liters to 40 liters and a sheet thickness of about 30 μm can be used, but the size of the gas holding bag is arbitrary and limited to this size. It's not a thing. The material is not limited to polypropylene, and may be polyethylene, polyvinyl chloride, polyethylene terephthalate, polyvinyl alcohol, polyvinylidene chloride, polyamide, polyurethane, or the like.

The packing material for a secondary battery according to the present invention may include a fixing means for simply fixing the gas holding bag to the transport container. As the fixing means, for example, a simple fixing means composed of a transparent synthetic resin film and an adhesive can be used, but the fixing means is arbitrary, and other fixing means may be adopted.

As the packing material for a secondary battery according to the present invention, a box or a bag can be used as the transport container. The box may be a cardboard box or a reinforced plastic box. As the size of the box, for example, 350 mm × 250 mm × 150 mm can be adopted, but the size of the box is arbitrary and is not limited to this size.

When the secondary battery generates heat or a fire breaks out from the secondary battery, a damaged port is formed in the fire extinguishing bag due to the heat generated by the secondary battery or the heat of the fire, and the fire extinguishing agent leaks from the damaged port. The leaked fire extinguishing agent cools the secondary battery.

The fire extinguishing agent that cools the secondary battery is vaporized by the heat of the secondary battery or the heat of the fire to become the gas of the fire extinguishing agent, and the space around the secondary battery is filled with the gas of the fire extinguishing agent. The supply of oxygen to the next battery is cut off. Since the secondary battery is cooled and the supply of oxygen to the secondary battery is cut off, the combustion of combustibles in the secondary battery is suppressed or stopped, and the explosion of the secondary battery is prevented. The secondary battery is extinguished.

If the secondary battery explodes or a fire breaks out from the secondary battery, the surrounding luggage carried with this explosion or fire may spread and cause a car fire. Since the secondary battery is prevented or the secondary battery is extinguished, the present invention prevents the spread of fire to surrounding luggage, prevents an automobile fire, and prevents a major accident caused by an automobile fire.

As described above, according to the present invention, the secondary battery can be safely and inexpensively stored and transported.

If there are multiple secondary batteries in the baggage and one secondary battery heats up or catches fire, the hot or burning secondary battery will be quickly cooled and extinguished. A car that prevents a chain of explosions caused by a secondary battery that is generating heat or has a fire heating another secondary battery, and a chain of explosions of a large number of secondary batteries. Fires are prevented and major accidents caused by automobile fires are prevented.

When the fire extinguishing agent _{consists of a substance represented by the chemical formula of CF 3} CF ₂ C (O) CF (CF ₃ ) ₂ , since this substance is a high-performance fire extinguishing agent, the secondary battery that is in fire burns quickly. Is suppressed or stopped.

When the synthetic resin sheet is made of a laminated gas barrier layer, the fire extinguishing agent does not easily permeate through the synthetic resin sheet and leak to the outside, so that the fire extinguishing agent does not easily decrease over a long period of time. As long as there is no fire, the fire extinguishing coating material can be used for a long period of time.

When the gas barrier layer is made of ethylene vinyl alcohol copolymer (EVOH), the shielding ability of the synthetic resin sheet against the fire extinguishing agent is enhanced, so that the fire extinguishing agent is difficult to permeate from the synthetic resin sheet and the fire is extinguished. As long as the agent is difficult to reduce over a long period of time and there is no fire from the secondary battery, the fire extinguishing coating material can be used for a long period of time.

When the thickness of the thermoplastic resin layer is 0.03 mm to 0.15 mm and the thickness of the gas barrier layer is 0.001 mm to 0.05 mm, the fire extinguishing bag is damaged by the heat generated by the secondary battery or the heat of the fire. The mouth is formed quickly, and the fire extinguishing agent can be held in the fire extinguishing bag for a long period of time.

If the structure is such that the inside of the fire extinguishing bag is a gas barrier layer and the outside of the fire extinguishing bag is a thermoplastic resin layer, the gas barrier layer is unlikely to be damaged even if the fire extinguishing bag is physically contacted from the outside. As long as the fire extinguishing agent does not easily penetrate the fire extinguishing bag and leak to the outside, the fire extinguishing agent does not easily decrease for a long period of time, and there is no fire from the secondary battery, the fire extinguishing coating material can be used for a long period of time. can.

When the gas barrier layer is sandwiched between the thermoplastic resin layers, the gas barrier layer is not easily damaged, so that the fire extinguishing agent is hard to permeate from the synthetic resin sheet, and the fire extinguishing agent is hard to be reduced for a long period of time. As long as there is no fire from the secondary battery, the fire extinguishing coating material can be used for a long period of time.

When the present invention includes a storage box for storing a secondary battery wrapped with a fire extinguishing coating material, the fire extinguishing agent leaked from the fire extinguishing coating material due to heat generation or fire of the secondary battery extinguishes a fire at the bottom of the storage box. Form a pool of agent.

The secondary battery that is generating heat or has a fire is immersed in the pool of the fire extinguishing agent, the secondary battery is cooled by the pooled fire extinguishing agent, and the pooled fire extinguishing agent is the heat of the secondary battery or the heat of the secondary battery. It is vaporized by the heat of the fire, and the vaporized fire extinguishing agent gas cuts off the supply of oxygen to the secondary battery, and suppresses or stops the combustion occurring inside the secondary battery.

Further, when the present invention includes a storage box for storing a secondary battery wrapped with a fire extinguishing coating material, when the secondary battery explodes, most of the fragments of the secondary battery scattered by the explosion are stored in the storage box. It stays inside and does not damage the packing material that packs the storage box from the outside.

The hot smoke and gas discharged from the secondary battery that broke out, and the hot smoke and gas generated by the explosion of the secondary battery are discharged to the outside of the storage box through the gap of the storage box.

When the present invention includes a fireproof bag that wraps the storage box from the outside, the hot smoke or gas discharged to the outside of the storage box through the gap of the storage box is absorbed by the fireproof bag and is made of plastic. It is lowered to a temperature that can be held in the bag (gas holding bag described later) and discharged to the outside of the fireproof bag.

When the present invention includes a gas holding bag that wraps the fire protection bag from the outside, smoke or gas discharged to the outside of the fire protection bag is held in the gas holding bag and is not discharged to the periphery of the luggage. Therefore, the surrounding luggage carried together is not polluted by the smoke or gas discharged from the secondary battery that has ignited or exploded.

When the present invention includes a simple fixing sheet made of an adhesive sheet for easily fixing a package containing a secondary battery in the container, the package can be easily fixed in the container. can.

FIG. 1 is an explanatory view showing a cross-sectional structure of a package formed by packaging a secondary battery with the packaging material for a secondary battery according to the present invention. FIG. 2 is an explanatory diagram showing a state (state 1) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 3 is an explanatory diagram showing a state (state 2) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 4 is an explanatory diagram showing a state (state 3) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 5 is an explanatory diagram showing a state (state 4) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 6 is an explanatory diagram showing a state (state 5) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 7 is an explanatory diagram showing a state (state 6) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 8 is an explanatory diagram showing a state (state 7) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. FIG. 9 is an explanatory diagram illustrating a situation when a secondary battery packed with the secondary battery packing material according to the present invention generates heat or catches fire.

The purpose of safely and inexpensively storing and transporting secondary batteries, which have a risk of fire or explosion, has been realized by using inexpensive materials without sacrificing safety.

FIG. 1 is an explanatory view showing a cross-sectional structure of a package formed by packaging a secondary battery with the packaging material for a secondary battery according to the present invention. In the figure, 10 is a secondary battery, and the secondary battery 10 is wrapped in a fire extinguishing coating material 12. The fire extinguishing coating material 12 is stored in the storage box 14. The storage box 14 is housed in a fire protection bag 16. The fire protection bag 16 is housed in the gas holding bag 18. The gas holding bag 18 is closed by the clip 28. The gas holding bag 18 is housed in the transport container 20. The gas holding bag 18 is fixed to the transport container 20 by the fixing means 22.

Here, as the secondary battery 10, for example, a lithium ion battery can be mentioned, but the secondary battery 10 is not limited to the lithium ion battery, and all of them have a risk of catching fire or exploding. Targets secondary batteries.

The fire extinguishing coating material 12 has one or more fire extinguishing bags 26 filled with the fire extinguishing agent 24, and the fire extinguishing bag 26 is such that a damaged port is easily formed by the heat of the fire of the lithium ion battery. It consists of a synthetic resin sheet that is sensitive to heat.

As the fire extinguishing agent 24, a compound which is liquid at 25 ° C. (normal temperature) and has a fire extinguishing action having a boiling point of 75 ° C. or lower is preferable. If the compound is liquid at 25 ° C (normal temperature), the generated secondary battery 10 can be cooled by immersing it in the liquid fire extinguishing agent 24, and if the compound has a boiling point of 75 ° C or lower, it is vaporized from the generated secondary battery 10. The secondary battery 10 can be cooled by vaporizing while taking heat. Examples of such a compound include a compound represented by the chemical formula of _{CF 3} CF ₂ C (O) CF (CF ₃ ) _2.

As the synthetic resin sheet, a thermoplastic resin sheet may be simply used, but a sheet having a structure in which the gas barrier layer is laminated on the thermoplastic resin layer is preferable. This is because in the case of a structure in which the gas barrier layers are laminated, the fire extinguishing agent 24 can be prevented from permeating and leaking from the fire extinguishing bag 26, and the fire extinguishing coating material 12 can be used repeatedly for a long period of time. ..

As the material of the thermoplastic resin layer, polyethylene resin, polypropylene resin, or other polyolefin resin can be used. Examples of the material of the gas barrier layer include ethylene vinyl alcohol copolymer (EVOH).

The thickness of the thermoplastic resin layer is preferably 0.03 mm to 0.15 mm. If the thickness of the thermoplastic resin layer is less than 0.03 mm, there is a problem that the fire extinguishing bag 26 filled with the fire extinguishing agent 24 is easily physically damaged. If the thickness of the thermoplastic resin layer exceeds 0.15 mm, there is a problem that a damaged port cannot be quickly formed in the fire extinguishing bag 26 due to the heat of the fire of the secondary battery 10. This is because these problems do not occur when the thickness of the thermoplastic resin layer is 0.03 mm to 0.15 mm.

The thickness of the gas barrier layer is preferably 0.001 mm to 0.05 mm. If the thickness of the gas barrier layer is less than 0.001 mm, there is a problem that the fire extinguishing agent 24 permeates and leaks from the fire extinguishing bag 26. If the thickness of the gas barrier layer exceeds 0.05 mm, there is a problem that a damaged port cannot be quickly formed in the fire extinguishing bag 26 due to the heat of the fire of the secondary battery 10. This is because these problems do not occur when the thickness of the gas barrier layer is 0.001 mm to 0.05 mm.

When a synthetic resin sheet having a laminated structure is used, it is preferable that the inside of the fire extinguishing bag 26 is a gas barrier layer and the outside of the fire extinguishing bag 26 is a thermoplastic resin layer. When the fire extinguishing bag 26 is in physical contact from the outside, the thermoplastic resin layer protects the gas barrier layer, so that the gas barrier layer is not easily scratched, and the fire extinguishing agent 24 permeates from the fire extinguishing bag 26. This is because it is difficult to leak.

Further, as the synthetic resin sheet having a laminated structure, a structure in which the gas barrier layer is sandwiched between the thermoplastic resin layers (eg, nylon layer) is also preferable. This is because the thermoplastic resin layer protects the gas barrier layer from the front and back surfaces, so that the gas barrier layer is less likely to be scratched and the fire extinguishing agent 24 is less likely to permeate or leak from the fire extinguishing bag 26.

As the shape of the fire extinguishing coating material 12, a substantially matte shape or a substantially bag shape can be adopted. The substantially matte shape refers to a shape in which a plurality of fire extinguishing bags are connected so as to form a substantially plate shape in the longitudinal direction. This is because if the shape of the fire extinguishing coating material 12 is substantially mat-shaped or substantially bag-shaped, it is easy to store and surround the secondary battery.

The storage box 14 is preferably made of a non-combustible material, for example aluminum, which is not very heavy and has some strength. As the size of the storage box, for example, 190 mm × 130 mm × 50 mm can be exemplified, but the size of the storage box is arbitrary and is not limited to this size.

The fire protection bag 16 is preferably formed of spatter felt. This is because spatter felt has high flame resistance. The spatter felt preferably has a thickness of about t = 5 mm, but the thickness of the spatter felt is arbitrary and is not limited to this thickness.

As the gas holding bag 18, a polypropylene bag can be used. A polypropylene bag having a capacity of about 20 liters to 40 liters and a sheet thickness of about 30 μm can be used, but the size is arbitrary and is not limited to this size.

As the fixing means 22, for example, a simple fixing means composed of a transparent synthetic resin film and an adhesive can be used, but the fixing means is arbitrary, and other fixing means may be adopted.

As the transport container 20, a box or a bag can be used. As the box, a cardboard box or a reinforced plastic box can be adopted. As the size of the box, for example, 350 mm × 250 mm × 150 mm can be adopted, but the size of the box is arbitrary and is not limited to this size.

Next, a method of packing the secondary battery using the packing material for the secondary battery according to the present invention will be described with reference to FIGS. 2 to 8.

Packing Step 1: FIG. 2 is an explanatory diagram showing a state (state 1) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. As shown in the figure, the secondary battery 10 is placed on the fire extinguishing coating material 12, the fire extinguishing coating material 12 is folded, and the secondary battery 10 is wrapped with the fire extinguishing coating material 12.

Packing Step 2: FIG. 3 is an explanatory diagram showing a state (state 2) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. As shown in the figure, the package formed in the packaging step 1, that is, the secondary battery 10 wrapped in the fire extinguishing coating material 12, is stored in the storage box 14.

Packing Step 3: FIG. 4 is an explanatory view showing a state (state 3) when the secondary battery is packed using the packing material for the secondary battery according to the present invention, and FIG. 5 is a packing for the secondary battery according to the present invention. It is explanatory drawing which shows the state (state 4) at the time of packing a secondary battery using a material. As shown in FIG. 4, the fire protection bag 16 is prepared, and as shown in FIG. 5, the storage box 14 is inserted and stored in the fire protection bag 16.

Packing Step 4: FIG. 6 is an explanatory diagram showing a state (state 5) when the secondary battery is packed using the packing material for the secondary battery according to the present invention. As shown in the figure, the gas holding bag 18 is prepared, and the package formed in step 3, that is, the storage box 14 inserted and stored in the fire protection bag 16 is put into the gas holding bag 18.

Packing Step 5: FIG. 7 is an explanatory view showing a state (state 6) when the secondary battery is packed using the packing material for the secondary battery according to the present invention, and FIG. 8 is the packing for the secondary battery according to the present invention. It is explanatory drawing which shows the state (state 7) at the time of packing a secondary battery using a material. As shown in FIG. 7, the transport container 20 is prepared, and as shown in FIG. 8, the package wrapped in the gas holding bag is stored in the transport container 20, and the package is simply fixed to the transport container 20 by the fixing means 22. Fix.

Next, the action of the packing material for the secondary battery when the secondary battery 10 generates heat or a fire breaks out from the secondary battery 10 will be described with reference to FIG.

FIG. 9 is an explanatory diagram illustrating a situation when a secondary battery packed with the secondary battery packing material according to the present invention generates heat or catches fire. As shown in the figure, when the secondary battery 10 generates heat or a fire breaks out from the secondary battery 10, a damaged port is formed in the fire extinguishing bag 26 due to the heat generated by the secondary battery 10 or the heat of the fire, and the damaged port is formed. The fire extinguishing agent 24 leaks from the fire extinguishing agent 24, and the leaked fire extinguishing agent 24 forms a pool of the fire extinguishing agent 24 at the bottom of the storage box 14.

The secondary battery 10 is immersed in the pool of the fire extinguishing agent 24 and cooled by the fire extinguishing agent 24. Further, the accumulated fire extinguishing agent 24 is heated and vaporized by the heat of the secondary battery 10 and the heat of the fire, and an atmosphere of the fire extinguishing agent gas is formed around the secondary battery 10, and the atmosphere of the fire extinguishing agent gas is formed. As a result, oxygen disappears around the secondary battery 10, and the supply of oxygen to the secondary battery 10 is cut off.

Since the secondary battery 10 is cooled by the fire extinguishing agent 24 and the supply of oxygen to the secondary battery 10 is cut off, the combustion of combustibles inside the secondary battery 10 is stopped, and the secondary battery 10 is extinguished. NS.

When the secondary battery 10 explodes, most of the fragments of the secondary battery 10 scattered by the explosion stay in the storage box 14 and do not damage the fireproof bag 16 that surrounds the storage box 14 from the outside.

The high-heat smoke and gas discharged from the secondary battery 10 that broke out, and the high-heat smoke and gas generated by the explosion of the secondary battery 10 are discharged to the outside of the storage box 14 through the gap of the storage box 14.

The high-heat smoke and gas discharged to the outside of the storage box 14 through the gap of the storage box 14 absorb heat to some extent in the fire protection bag 16, lower the temperature, and are discharged to the outside of the fire protection bag 16.

Smoke and gas discharged to the outside of the fire protection bag 16 are held inside the gas holding bag 18 and are not discharged to the periphery of the luggage. Therefore, the surrounding luggage carried together is not contaminated by the smoke or gas emitted from the secondary battery that has ignited or exploded.

In the above embodiment, the shape of the fire extinguishing coating material is substantially matte or substantially bag-shaped so that the secondary battery can be wrapped in the fire extinguishing bag containing the fire extinguishing agent, but the secondary battery is wrapped. Without considering this, form a simple shape of a fire extinguishing bag containing a fire extinguishing agent, combine this with a secondary battery, pack it in the same manner as in the above embodiment, and store the secondary battery in this state. Even if it is transported or transported, the effect of extinguishing or preventing fire on the secondary battery can be obtained in the same manner. In this case, the fire extinguishing agent, fire extinguishing bag, storage box, fire protection bag, gas holding bag, transport container, and fixing means are the same as those in the above embodiment.

The present invention is used not only as a simple packing material for storing and transporting a secondary battery having a risk of fire or explosion, but also for storing and transporting combustible materials such as fireworks, lighters, thinners, etc. It can also be used as a simple packing material.

10 Rechargeable battery 12 Fire extinguishing coating material 14 Storage box 16 Fire protection bag 18 Gas holding bag 20 Transport container 22 Fixing means 24 Fire extinguishing agent 26 Fire extinguishing bag 28 Clip

Claims (21)

When a secondary battery is used by wrapping it and a fire breaks out from the secondary battery, the secondary battery is extinguished and has a fire extinguishing bag filled with a fire extinguishing agent. A fire extinguishing coating material for a secondary battery, which comprises a synthetic resin sheet in which a damaged port is formed by heat. The fire extinguishing coating material for a secondary battery according to claim 1, wherein the fire extinguishing agent is a liquid at 25 ° C. (normal temperature) and is a compound having a fire extinguishing action having a boiling point of 75 ° C. or lower. The fire extinguishing coating material for a secondary battery according to claim 2, wherein the fire extinguishing agent is _{a substance represented by the chemical formula of CF 3} CF ₂ C (O) CF (CF ₃ ) _2. The fire extinguishing coating material for a secondary battery according to claim 1, wherein the synthetic resin sheet is formed by laminating a gas barrier layer on a thermoplastic resin layer. The fire extinguishing coating material for a secondary battery according to claim 4, wherein the gas barrier layer is made of an ethylene vinyl alcohol copolymer (EVOH). The fire extinguishing for a secondary battery according to claim 4, wherein the thickness of the thermoplastic resin layer is 0.03 mm to 0.15 mm, and the thickness of the gas barrier layer is 0.001 mm to 0.05 mm. Covering material. The fire extinguishing coating material for a secondary battery according to claim 4, wherein the thermoplastic resin layer is laminated on the outside of the gas barrier layer. The fire extinguishing coating material for a secondary battery according to claim 4, wherein the gas barrier layer is sandwiched between the thermoplastic resin layers. A packing material used for storing and transporting a secondary battery, a fire extinguishing coating material used by wrapping the secondary battery, and a packing material formed by wrapping the secondary battery with at least the fire extinguishing coating material. The fire extinguishing coating material has a fire extinguishing bag filled with a fire extinguishing agent, and the fire extinguishing bag is formed with a damaged port by the heat of the fire. A packaging material for secondary batteries, which is characterized by being made of a synthetic resin sheet. The packaging material for a secondary battery according to claim 9, wherein the fire extinguishing agent is a liquid at 25 ° C. (normal temperature) and is a compound having a fire extinguishing action having a boiling point of 75 ° C. or lower. The packaging material for a secondary battery according to claim 10, wherein the fire extinguishing agent is _{a substance represented by the chemical formula of CF 3} CF ₂ C (O) CF (CF ₃ ) _2. The packaging material for a secondary battery according to claim 9, wherein the synthetic resin sheet is formed by laminating a gas barrier layer on a thermoplastic resin layer. The packaging material for a secondary battery according to claim 12, wherein the gas barrier layer is made of an ethylene vinyl alcohol copolymer (EVOH). The packaging for a secondary battery according to claim 12, wherein the thickness of the thermoplastic resin layer is 0.03 mm to 0.15 mm, and the thickness of the gas barrier layer is 0.001 mm to 0.05 mm. Material. The packaging material for a secondary battery according to claim 12, wherein the thermoplastic resin layer is laminated on the outside of the gas barrier layer. The packaging material for a secondary battery according to claim 12, wherein the gas barrier layer is sandwiched between the thermoplastic resin layers. The packing material for a secondary battery according to claim 9, further comprising a storage box for storing the secondary battery wrapped in the fire extinguishing coating material. The packaging material for a secondary battery according to claim 9, further comprising a fireproof bag for wrapping the storage box. The packing material for a secondary battery according to claim 9, further comprising a gas holding bag for wrapping the fire protection bag. The packaging material for a secondary battery according to claim 9, further comprising a fixing means for simply fixing the package to a transport container. The packing material for a secondary battery according to claim 9, wherein the transport container is a box or a bag.

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