Transport Container for Energy Storage Device and Method for Transporting Energy Storage Device Using the Same

Abstract

To provide a power storage device transportation container or a transportation method capable of reducing the risk of ignition when a power storage device or a power storage device stack in which a plurality of power storage devices are stacked is damaged or when an abnormality such as a high temperature environment occurs.SOLUTION: A power storage device transportation container has a structure in which an acrylic polymer molding containing a fire extinguishing agent is placed in a gap between a power storage device and a transportation container. This molding is preferably in the form of a film, a sheet, or a plate.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a transport container for transporting and moving while enclosing a power storage device such as a lithium ion battery, a lithium ion capacitor, and an electric double layer capacitor, and a method for transporting a power storage device using the same. In particular, the present invention relates to a power storage device transport container and a transport method capable of reducing the risk of spreading fire outside the container even when a fire occurs during an abnormality such as damage to the power storage device or a high temperature environment.

Background Art

[0002] In recent years, as a power source for high-output portable devices and electric vehicles, power storage devices such as secondary batteries, lithium ion capacitors, and electric double layer capacitors in which a power storage device using a non-aqueous electrolyte is housed in a casing have been used.

[0003] When such a power storage device is usually transported and moved in a container, it is common to transport and move it with a low charge rate (SOC), for example, 30% or less, as a charged state. However, due to an external short circuit or being left in a high temperature environment, there is a risk of ignition or explosion even when the charge state is low.

[0004] As a technique for preventing ignition of this power storage device, for example, a method has been proposed in which gas generated inside a lithium ion battery is absorbed by a combustible gas absorbent to prevent the battery from bursting (Patent Documents 1 and 2).

[0005] On the other hand, a method has also been proposed in which a fire extinguishing agent is disposed inside a lithium ion battery to lower the temperature of the gas released to the outside when a safety valve is opened due to an increase in internal pressure caused by gas generation inside the battery (Patent Document 3). Furthermore, a method has been proposed in which a porous material in which an incombustible gas, an aqueous solvent, or an incombustible solvent is adsorbed on pores and the surface is disposed inside a lithium ion battery to prevent ignition by gas generated from the lithium ion battery (Patent Document 4).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, when there is an electrical abnormality or thermal runaway in the power storage device, a large amount of gas is generated instantaneously. Therefore, in the method of disposing a gas adsorbent as described in Patent Documents 1 and 2 inside the power storage device, for the limited space of the power storage device, both the gas adsorption amount and the gas adsorption rate are insufficient, and there is a problem that the gas ejection from the power storage device cannot be completely suppressed. Further, as described in Patent Documents 3 and 4, in the method of disposing a fire extinguishing agent or a material adsorbed with a non-flammable gas, an aqueous solvent, or a non-flammable solvent in the pores and on the surface of a porous material inside the lithium-ion battery to lower the internal temperature of the lithium-ion battery, if the gas adsorption amount is insufficient, the effect cannot be fully exerted, and there is also a problem that the gas ejection cannot be completely suppressed.

[0008] Due to these problems, in the technologies described in Patent Documents 1 to 4, when transporting and moving the power storage device in a container, the effect of suppressing short circuits due to external factors, ignition, explosion, etc. when left in a high-temperature environment, and suppressing the spread of fire to the external environment is not sufficient.

[0009] The present invention has been made in view of the above problems, and when transporting and moving a power storage device and a plurality of power storage devices by enclosing them, it is possible to reduce the risk of fire spreading outside the container in the event of an abnormality such as damage to the power storage device or a high-temperature environment. An object of the present invention is to provide a power storage device transport container and a transport method using this transport container.

Means for Solving the Problems

[0010] In order to solve the above problems, the present invention first provides a power storage device transport container in which a molded body of an acrylic polymer enclosing a fire extinguishing agent is disposed in a gap between a power storage device and a transport container body for housing the power storage device (Invention 1). In the above invention (Invention 1), it is preferable that the power storage device uses a non-aqueous electrolyte (Invention 2).

[0011] According to such inventions (Inventions 1 and 2), by disposing a molded body of an acrylic polymer enclosing a fire extinguishing agent in the space between the power storage device and the power storage device transport container, the risk of fire spreading outside the container in the event of an abnormality such as damage to the power storage device or a high-temperature environment can be significantly reduced.

[0012] In the above inventions (Inventions 1 and 2), it is preferable that the molded body of the acrylic polymer enclosing the fire extinguishing agent contains 10% by weight or more of the acrylic polymer in total (Invention 3).

[0013] According to such an invention (Invention 3), the effect of preventing fire from spreading outside the transport container when an abnormality occurs in the power storage device can be preferably exhibited.

[0014] In the above inventions (Inventions 1 to 3), it is preferable that the acrylic polymer is a homopolymer or copolymer synthesized using one or two or more (meth)acrylic acid alkyl esters as monomers, polyacrylonitrile synthesized using acrylonitrile as a monomer, or a copolymer of (meth)acrylic acid alkyl ester or acrylonitrile and one or two or more other monomers (Invention 4).

[0015] In the above inventions (Inventions 1 to 4), it is preferable that the molded body of the acrylic polymer encapsulating the fire extinguishing agent is in the form of a film, sheet or plate (Invention 5).

[0016] According to such an invention (Invention 5), by forming the molded body of the acrylic polymer encapsulating the fire extinguishing agent into a film, sheet or plate, it can be attached to the inner wall surface of the transport container, inserted into the gap, or configured to form a partition structure, etc., so that its installation variations can be made rich, and it can be made excellent in handleability.

[0017] In the above invention (Invention 5), it is preferable that the molded body of the acrylic polymer encapsulating the fire extinguishing agent in the form of a film, sheet or plate has a thickness of 1 μm to 5000 μm (Invention 6). Particularly in the above invention (Inventions 5 or 6), the weight per unit area of the molded body in the form of a film, sheet or plate is 10 g to 3000 g / m 2 and it is preferable that it is (Invention 7).

[0018] Further, in the above inventions (Inventions 5 to 7), the molded body in the form of a film, sheet or plate may be formed of a two-layer structure of an acrylic polymer and a fire extinguishing agent, a three-layer structure of an acrylic polymer, a fire extinguishing agent and an acrylic polymer, or a plurality of layers of an acrylic polymer and a fire extinguishing agent (Invention 8).

[0019] According to such inventions (Inventions 6 to 8), by disposing a molded body in the form of a film, sheet or plate having a predetermined thickness and weight in the gap between the power storage device and the casing, the effect of preventing the spread of fire to the outside of the transport container when an abnormality occurs in the power storage device can be preferably exerted.

[0020] In the above inventions (Inventions 1 to 8), the molded body of the acrylic polymer encapsulating the fire extinguishing agent may be used as a battery case, a storage case for a power storage device, or a casing that wraps the power storage device (Invention 9)

[0021] According to such an invention (Invention 9), since the transport container itself can be given a fire spread prevention effect, it is only necessary to accommodate the power storage device, and it is particularly excellent in handleability.

[0022] In the above inventions (Inventions 1 to 9), a plurality of the power storage devices may be stacked (Invention 10).

[0023] According to such an invention (Invention 10), in a power storage device stack in which a plurality of power storage devices are stacked, if there is an abnormality in one power storage device, it may spread to a plurality of power storage devices and a large amount of combustible gas may be ejected. However, even if the combustible gas flows out into the internal space of the transport container, since the material of the molded body containing the acrylic polymer affects the combustible gas, the risk of fire spreading outside the transport container can be significantly reduced. Therefore, it can be particularly preferably applied to the power storage device stack.

[0024] Second, the present invention also provides a method for transporting a power storage device in which the power storage device is accommodated and transported in a power storage device transport container in which a molded body of an acrylic polymer enclosing a fire extinguishing agent is disposed in a gap between the power storage device and a transport container body for accommodating the power storage device (Invention 11).

[0025] According to such an invention (Invention 11), by disposing a molded body of an acrylic polymer enclosing a fire extinguishing agent in the space between the power storage device and the power storage device transport container body, the power storage device can be transported while reducing the risk of fire spreading to the outside of the transport container in case of an abnormality such as damage to the power storage device or a high temperature environment.

Effects of the Invention

[0026] In the present invention, a molded body of an acrylic polymer encapsulating a fire extinguishing agent is disposed in the gap between the power storage device and the transport container body for housing the power storage device. Therefore, with respect to the high-temperature ejecta and ejectant gas discharged from the power storage device due to a short circuit or the like of the power storage device, the acrylic polymer is affected, thereby significantly reducing the risk of ignition of the power storage device transport container. Even when the acrylic polymer melts and ignites due to the high-temperature ejecta and ejectant gas discharged from the power storage device, the encapsulated fire extinguishing agent can extinguish the generated flame and improve the safety of the power storage device transport container.

Mode for Carrying Out the Invention

[0027] The power storage device transport container of the present invention will be described in detail based on the following embodiments.

[0028] [Power Storage Device Transport Container] The power storage device transport container of the present embodiment has a structure in which a molded body of an acrylic polymer encapsulating a fire extinguishing agent is disposed in the gap between the region where the power storage device is housed and the container body in the transport container body for housing the power storage device.

[0029] [Power Storage Device] In the present embodiment, the power storage device is not particularly limited, and either a primary battery or a secondary battery can be used, but a secondary battery is preferably used. The type of this secondary battery is not particularly limited. For example, a lithium ion battery, a lithium ion polymer battery, a all-solid-state battery, a lead storage battery, a nickel-hydrogen storage battery, a nickel-cadmium storage battery, a nickel-iron storage battery, a nickel-zinc storage battery, a silver oxide-zinc storage battery, a metal-air battery, a polyvalent cation battery, a capacitor, a capacitor, etc. can be used. Among these, those using a non-aqueous electrolyte can be preferably used. Among these secondary batteries, as a suitable application target of the battery material of the present embodiment, a lithium ion battery, a lithium ion polymer battery, a lithium ion capacitor, a all-solid-state battery, etc. can be preferably used.

[0030] The power storage device as described above may be in the form of a power storage device stack in which a plurality of them are stacked.

[0031] <Power storage device transport container body> In this embodiment, the transport container body is not particularly limited as long as it can externally wrap the above-described power storage device (power storage device stack) with a gap, and various materials such as those made of synthetic resin or metal can be used. As this transport container body, a rectangular box shape is common, but it is not limited thereto. It is preferable that a release valve or a release hole is provided in this transport container body so that when an abnormality occurs in the power storage device, the ejected gas or ejected matter released from the power storage device is released to the outside of the transport container.

[0032] <Fire prevention material> In this embodiment, as the fire prevention material installed in the gap between the power storage device and the casing, a molded body of an acrylic polymer encapsulating a fire extinguishing agent is arranged. As the material for encapsulating the fire extinguishing agent, an acrylic polymer is used because it itself has the effect of preventing ignition of the power storage device.

[0033] (Acrylic polymer) Examples of the above acrylic polymer include acrylic polymers (homopolymers or copolymers) synthesized using one or more (meth)acrylic acid alkyl esters as monomers. Also, polyacrylonitrile synthesized using acrylonitrile as a monomer can be mentioned. Furthermore, copolymers of these (meth)acrylic acid alkyl esters or acrylonitrile and one or more other monomers can be mentioned.

[0034] Specific examples of the (meth)acrylic acid alkyl ester include, for example, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate, sec-butyl methacrylate, isobutyl methacrylate, etc., but are not limited thereto.

[0035] Examples of other monomers that copolymerize with the monomers used in the above acrylic polymer include other (meth)acrylic acid alkyl esters, acrylonitrile, acrylamide, vinyl acetate, vinyl chloride, vinylidene chloride, styrene, etc., but are not limited thereto. It is preferable that this other monomer is 90% by weight or less, particularly about 40% by weight or less, based on the total 100% by weight of the monomers used in the acrylic polymer and other monomers. If there are too many other monomers, the effect of reducing the ignition risk of the power storage device transport container will be insufficient.

[0036] This acrylic polymer may further contain various commonly used additives as long as the effects of the present invention are not impaired. Examples of the additives include crosslinked rubber particles, ultraviolet absorbers, lubricants, antioxidants, mold release agents, antistatic agents, flame retardants, etc. Further, on the surface of the acrylic polymer, a material coated for enhancing functionality may be used as long as the effects of the present invention are not impaired.

[0037] The acrylic polymer as described above may be used alone or in combination of two or more materials.

[0038] Furthermore, these acrylic polymers can be used by imparting a material that exhibits a cooling effect by heat transfer absorption, an effect of suppressing combustion radical reactions, and an anti-inflammatory effect that makes the flame unstable on the adsorbent surface against the ejecta and ejected gas from the power storage device.

[0039] (Fire extinguishing agent) In this embodiment, the fire extinguishing agent used only needs to have a flame retardant function for preventing ignition and is not particularly limited. As this fire extinguishing agent, those based on a cooling action, a suffocating action, and a suppressing action (also called a negative catalyst effect, which suppresses the combustion reaction to extinguish the fire) are known, but a fire extinguishing agent effective for electrical fires is preferred. Examples of the fire extinguishing agent based on a cooling action include water. Examples of the fire extinguishing agent based on a suffocating action include nitrogen, argon, carbon dioxide, halides, etc., and they may have a flame retardant function of stopping the chain reaction of combustion by generating these inert gases. Further, an occlusion alloy or the like that occludes an inert gas in advance and can release it at a predetermined temperature can also be used. The fire extinguishing agent based on a suppressing action may or may not be one that stops the chain reaction of combustion that occurs when ignition such as a thermal decomposition reaction or an oxidation reaction occurs. Specifically, a radical trap fire extinguishing agent having a radical trap function and a supporting fuel blocking fire extinguishing agent such as a flame retardant resin fire extinguishing agent and an endothermic / diluting fire extinguishing agent can be used.

[0040] Among the fire extinguishing agents by inhibitory action, specific examples of radical trap fire extinguishing agents having a radical trap function include phosphorus compounds such as ammonium phosphate, ammonium dihydrogen phosphate, sodium phosphate, phosphate esters, trimethyl phosphite, red phosphorus, phosphazene; sodium hydrogen carbonate, potassium hydrogen carbonate, reaction product of potassium hydrogen carbonate and urea, sodium carbonate, hydrate of sodium carbonate, potassium carbonate, hydrate of potassium carbonate; potassium salts of organic carboxylic acids such as potassium acetate, potassium propionate, potassium citrate monopotassium salt, potassium citrate dipotassium salt, potassium citrate tripotassium salt, potassium trihydrogen ethylenediaminetetraacetate trihydrate, potassium dihydrogen ethylenediaminetetraacetate dihydrate, potassium hydrogen ethylenediaminetetraacetate monohydrate, potassium ethylenediaminetetraacetate tetrahydrate, potassium hydrogen phthalate, dipotassium phthalate, potassium hydrogen oxalate, dipotassium oxalate; ammonium sulfate; halogen compounds such as bromine compounds, halogenated modified polymers, perfluoroalkylsulfonic acids; hindered amine compounds such as hindered amines, phenol-added hindered amines; alkyl hydroquinone compounds such as butyl hydroquinone; bromine compounds such as brominated triazines, brominated epoxy resins; perfluoroalkylsulfonic acids: etc. can be mentioned, but are not limited thereto.

[0041] These fire extinguishing agents may also include those obtained by mixing a fuel component (such as dicyandiamide, nitroguanidine, guanidine nitrate, urea, melamine, melamine cyanurate, avicel, guar gum, sodium carboxymethyl cellulose, potassium carboxymethyl cellulose, ammonium carboxymethyl cellulose, nitrocellulose, aluminum, boron, magnesium, magnesium, zirconium, titanium, titanium hydride, tungsten, silicon, etc.) and an oxidizing agent component (such as potassium chlorate, sodium chlorate, strontium chlorate, ammonium chlorate, ammonium perchlorate, potassium nitrate, sodium nitrate, strontium nitrate, ammonium perchlorate, potassium perchlorate, basic copper nitrate, copper(I) oxide, copper(II) oxide, iron(II) oxide, iron(III) oxide, molybdenum trioxide, etc.). Further, as the potassium salt, those obtained by mixing potassium chlorate and a binder and molding them into a sheet shape can also be used.

[0042] Among the combustion-supporting substance-blocking fire extinguishing agents, examples of the flame-retardant resin fire extinguishing agents include polyphenylene sulfide resin (PPS), polyimide (PI) resin, rubber-based resins (such as styrene-butadiene rubber (SBR)), and the like. Also, among the combustion-supporting substance-blocking fire extinguishing agents, examples of the char-forming fire extinguishing agents include condensed phosphoric acid esters, silicone powder, zinc borate, organic bentonite, melamine resin (MF), expanded graphite, polycarbonate (PC), and polystyrene carbonate.

[0043] Examples of the heat-absorbing / diluting fire extinguishing agents include hydroxides such as calcium hydroxide, magnesium hydroxide, and aluminum hydroxide; alkali metal compounds such as sodium bicarbonate, potassium bicarbonate, potassium oxide, sodium carbonate, and potassium carbonate; ammonium dihydrogen phosphate; urea; and the like.

[0044] These fire extinguishing agents may be used alone or in combination of two or more.

[0045] In this embodiment, the shape of the molded body of the fire prevention material disposed in the gap between the power storage device and the transport container is not particularly limited. However, considering the ease of handling when installing in the gap between the power storage device and the transport container, it is preferably in the form of a film, sheet, or plate. By making the fire prevention material in the form of a film, sheet, or plate, it can be pasted inside the casing of the transport container, inserted into the gap, or configured to form a partition structure, etc., so that its installation variations can be made rich, and it can be made excellent in handleability.

[0046] The molded body of the acrylic polymer encapsulating the fire extinguishing agent in the form of a film, sheet, or plate is preferably 1 μm to 5000 μm in thickness. Also, the weight per unit area of the molded body in the form of a film, sheet, or plate is preferably 10 g to 3000 g / m 2 is preferred.

[0047] As a method for molding the molded body of the acrylic polymer encapsulating the fire extinguishing agent as described above, when the molded body is in the form of a film or sheet, a film or sheet product of the fire extinguishing agent can be sandwiched between two film products of the acrylic polymer with a thickness of 50 to 125 μm, and the periphery of the acrylic polymer can be heat-sealed. Also, in the case of a plate-shaped product, a space for inserting a sheet of the fire extinguishing agent is cut out in the central part of a single plate-shaped product of the acrylic polymer with a thickness of 1000 to 5000 μm, the fire extinguishing agent is put into the space, and the plate-shaped product of the acrylic polymer is fixed on it with an adhesive or a heat-resistant tape for molding, etc. However, it is only necessary that the fire extinguishing agent is contained in the acrylic polymer, and it is not limited to these manufacturing methods.

[0048] Also, as the molded body of the acrylic polymer encapsulating these fire extinguishing agents, it may be a molded body having a two-layer structure of an acrylic polymer and a fire extinguishing agent, or a three-layer structure of an acrylic polymer, a fire extinguishing agent, and an acrylic polymer, or even a molded body having a plurality of layers of three or more layers of an acrylic polymer and a fire extinguishing agent.

[0049] Furthermore, for the molded body of an acrylic polymer encapsulating these fire extinguishing agents, a material that exhibits a cooling effect by heat transfer absorption, an effect of suppressing combustion radical reactions, and an anti-inflammatory effect that destabilizes the flame on the surface of the adsorbent can be imparted to the ejected matter and ejected gas from the power storage device and used.

[0050] The molded body of an acrylic polymer encapsulating the fire extinguishing agent as described above may be used alone or in combination of two or more materials.

[0051] [Transport Method of Power Storage Device] For the power storage device and the transport container as described above, after installing a molded body of an acrylic polymer encapsulating a fire extinguishing agent in advance in the transport container main body, for example, a power storage device with a charge rate (SOC) of about 30% may be accommodated, the transport container may be sealed and transported, or after accommodating the power storage device in the transport container main body, a molded body of an acrylic polymer encapsulating a fire extinguishing agent may be installed in the gap, the transport container may be sealed and transported.

[0052] By accommodating and transporting the power storage device in such a transport container of this embodiment, even if a short circuit due to external factors or being left in a high-temperature environment causes the power storage device to catch fire, by providing a molded body of an acrylic polymer encapsulating a fire extinguishing agent, even if a short circuit due to external factors or ignition or explosion occurs when left in a high-temperature environment when the power storage device is put into the container for transport and movement, the spread of fire in the transport container can be prevented, so the risk of fire spreading outside the transport container can be reduced.

[0053] The above describes the power storage device transport container of the present invention. The present invention only needs to arrange a molded body of an acrylic polymer encapsulating a fire extinguishing agent in the gap between the power storage device (power storage device stack) and the transport container body, and the size, shape, etc. of the power storage device (power storage device stack) are not particularly limited. Therefore, it is applicable to power storage devices for various uses such as power storage devices (power storage device stacks) of a wide range of sizes from smartphones to in-vehicle use. Furthermore, the molded body of the acrylic polymer encapsulating the fire extinguishing agent itself may be used as a container for wrapping the power storage device to serve as a power storage device transport container.

Example

[0054] The present invention will be described in more detail based on the following specific examples, but the present invention is not limited to the following examples.

[0055] [Stabbing test] (Comparative Example 1) A container made of PP resin (inner diameter: 80 mm wide × 105 mm long × 34 mm deep, resin thickness 2 mm, with the electrode side of the aluminum laminate lithium-ion battery arranged on the 80 mm wide side of this PP resin container, and a container with an open top having 5 holes with a diameter of 10 mm opened on the 80 mm wide side of the PP resin container) was prepared assuming a transport container for a power storage device. Inside this PP resin container, a fully charged aluminum laminate lithium-ion battery (35 mm wide, 75 mm long) with a positive ternary system of 1500 mAh was installed, and it was covered with a PP resin plate with a resin thickness of 4 mm from above, and the periphery of the lid was sealed without gaps using heat-resistant tape so that the ejecta from the lithium-ion battery due to overcharging would be released only from the 5 opened holes.

[0056] When a stabbing test was performed on this power storage device transport container, the aluminum laminate lithium-ion battery was destroyed, and intense ignition was confirmed even outside the transport container.

[0057] (Example 1) Using the power storage device transport container used in Comparative Example 1 as the transport container body, between two film-shaped molded bodies of an acrylic polymer (94% or more of a polymer mainly composed of polymethyl methacrylate and 5% or less of an additive) (thickness 125 μm, weight per area 150 g / m2), as a fire extinguishing agent, a potassium salt sheet (a 100-μm-thick sheet composed of potassium bicarbonate, potassium chlorate, and a binder component) was placed, and the periphery was heat-sealed to obtain a three-layer-structured film-shaped molded body (thickness 350 μm). This was pasted onto the entire surface of a PP resin container assuming a transport container with a double-sided tape with an area of 0.05 m 2 to obtain a power storage device transport container.

[0058] When a nail puncture test was conducted on this power storage device transport container under the same conditions as in Comparative Example 1, the battery was destroyed, but no ignition was observed on the outside of the transport container.

Claims

1. A molded body of an acrylic polymer encapsulating a film-shaped or sheet-shaped fire extinguishing agent is disposed in a gap between a power storage device and a transport container body for housing the power storage device. The power storage device uses a non-aqueous electrolyte. The molded body of the acrylic polymer encapsulating the fire extinguishing agent contains 10% by weight or more of the acrylic polymer throughout. The acrylic polymer is a homopolymer or copolymer synthesized using one or more (meth)acrylic acid alkyl esters as monomers, a polyacrylonitrile synthesized using acrylonitrile as a monomer, or a copolymer of (meth)acrylic acid alkyl ester or acrylonitrile and one or more other monomers. A power storage device transport container.

2. The power storage device transport container according to claim 1, wherein the molded body of the acrylic polymer encapsulating the fire extinguishing agent is in the form of a film, a sheet, or a plate.

3. The power storage device transport container according to claim 2, wherein the film-shaped, sheet-shaped, or plate-shaped molded body of the acrylic polymer encapsulating the fire extinguishing agent has a thickness of 1 μm to 5000 μm.

4. The weight per unit area of the film-shaped, sheet-shaped or plate-shaped molded body is 10 g to 3000 g / m ２ The power storage device transport container according to claim 2 or 3, wherein the power storage device transport container is as described above.

5. The power storage device transport container according to any one of claims 2 to 4, wherein the film-shaped, sheet-shaped, or plate-shaped molded body is formed of a two-layer structure of an acrylic polymer and a fire extinguishing agent, a three-layer structure of an acrylic polymer, a fire extinguishing agent, and an acrylic polymer, or a plurality of layers of an acrylic polymer and a fire extinguishing agent.

6. The power storage device transport container according to any one of claims 1 to 5, wherein the molded body of the acrylic polymer encapsulating the fire extinguishing agent is used as a battery case, a storage case for a power storage device, or a casing that wraps around the power storage device.

7. The power storage device transport container according to any one of claims 1 to 6, wherein a plurality of the power storage devices are stacked.

8. A method for transporting a power storage device, wherein the power storage device is housed and transported in a power storage device transport container in which a molded body of an acrylic polymer encapsulating a film-shaped or sheet-shaped fire extinguishing agent is disposed in a gap between the power storage device and a transport container body for housing the power storage device.