JP5966457B2 - Ignition prevention material for electricity storage device, ignition prevention system including this ignition prevention material, and electricity storage system using this ignition prevention system - Google Patents

Description

  The present invention relates to an ignition prevention material capable of reducing the risk of ignition when a safety valve opens and the contents leak when a power storage device such as a lithium ion battery, a lithium ion capacitor, or an electric double layer capacitor is abnormal. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition prevention system including a prevention material, and a highly safe power storage system using the ignition prevention system.

  An electricity storage device using a non-aqueous electrolyte has an internal temperature that rises in the event of an abnormality such as overcharge or short circuit, and as a result, gas is generated by evaporation or decomposition of the electrolyte, and the internal pressure increases due to the generated gas. There is a risk of damage. Therefore, the electricity storage device is equipped with a safety valve, and in the unlikely event that the internal pressure of the electricity storage device exceeds a predetermined pressure, the electrolyte valve or other decomposition gas is ejected from the safety valve to the outside. Yes. However, since these gas components are high temperature and contain a large amount of combustible components, there is a risk of causing ignition, explosion, etc. when released outside the electricity storage device.

  As a technique for preventing ignition when such a safety valve is operated, for example, a method has been proposed in which gas generated inside a lithium ion battery is absorbed by a gas adsorbent to prevent the battery from bursting (Patent Document 1, Patent Document 1). 2).

  On the other hand, there has also been proposed a method for lowering the temperature of the gas released to the outside by disposing a fire extinguishing agent inside the battery when the safety valve opens due to an increase in internal pressure due to the generation of gas inside the lithium ion battery. (Patent Document 3).

JP 2001-155790 A JP 2003-077549 A JP 2010-287488 A

  However, a large amount of gas is generated instantaneously at the time of electrical abnormality or thermal runaway. However, in the conventional gas adsorbents described in Patent Documents 1 and 2, both the gas adsorption amount and the gas adsorption speed are obtained. Insufficient and difficult to prevent the opening of the safety valve, there is a problem that a large amount of gas components may be ejected. Further, in the method using a fire extinguishing agent to reduce the temperature inside the lithium ion battery as described in Patent Document 3, the extinguishing agent is disposed between the electrodes, so that the battery volume increases. In addition to battery life, battery performance may be reduced. In addition, there is a problem that when an instantaneous thermal runaway occurs, there is a possibility that this fire extinguisher may not function effectively.

  The present invention has been made in view of the above problems, and provides an ignition prevention material made of a material that can reduce the ignition risk when a safety valve of an electricity storage device is opened, and an ignition prevention system including the ignition prevention material. With the goal. Moreover, an object of this invention is to provide the highly safe electrical storage system using the said ignition prevention system.

  In order to solve the above-mentioned problems, firstly, the present invention is directed to preventing ignition of an electricity storage device characterized by adsorbing a non-flammable gas, an aqueous solvent or a non-flammable solvent in and on the pores of a porous material. A material is provided (Invention 1).

  According to this invention (Invention 1), gas components such as a vaporized electrolytic solution and a decomposition gas of the electrolytic solution that are released when the safety valve of the power storage device and the power storage system is opened are incombustible in the pores and on the surface. It passes through a porous material adsorbing a gas or an aqueous solvent or a nonflammable solvent. At this time, the non-combustible gas or the aqueous solvent or non-combustible solvent adsorbed on the porous material is desorbed while taking the ambient temperature, so the temperature of the gas component generated when the storage device is abnormal is lowered. This can prevent gas components from igniting and exploding. Moreover, since the gas component and the inert gas which were originally adsorbed are adsorbed, the gas component ejected into the pores generated in the porous material is adsorbed, so that the amount of ejected matter can be reduced.

  In the said invention (invention 1), it is preferable that the said aqueous solvent is water or aqueous solution (invention 2). Moreover, in the said invention (invention 1), it is preferable that the said nonflammable gas is 1 type, or 2 or more types of a carbon dioxide, nitrogen, a halogen, and a noble gas (invention 3).

  According to the inventions (Inventions 2 and 3), it is possible to prevent ignition and explosion while absorbing the gas component generated when the storage device is abnormal or the like safely and reliably.

In the said invention (invention 1-3), it is preferable that the specific surface area of the said porous raw material is 10-3000 m < ² > / g (invention 4).

  According to this invention (invention 4), a sufficient contact area between the porous material and the gas component generated when the power storage device is abnormal can be ensured. Etc. can be prevented.

  In the said invention (invention 1-4), it is preferable that the said porous raw material has a 0.1-10 nm pore diameter (invention 5).

  According to this invention (invention 5), by catching the gas generated when the power storage device is abnormal in the pores, it is possible to quickly prevent ignition / explosion due to this gas component.

  In the said invention (invention 1-5), it is preferable that a previous porous material has an average particle diameter of 0.1-5.0 mm (invention 6). The porous material is preferably a molded product obtained by processing a porous powder material (Invention 7).

  2ndly, this invention provides the ignition prevention system characterized by using the ignition prevention material of the electrical storage device in any one of invention 1 to 7 (invention 8).

  According to this invention (invention 8), by using an ignition preventing material for an electricity storage device, it is possible to prevent ignition / explosion while absorbing a gas component generated when the electricity storage device is abnormal, etc. It can be an ignition prevention system.

  Furthermore, the third aspect of the present invention is a power storage system including at least one power storage device including a battery element formed by winding or laminating a positive electrode and a negative electrode with a separator interposed therebetween, and an electrolyte solution, An energy storage device and an energy storage system each have a pressure release valve that opens at a predetermined pressure, and a secondary battery system comprising the ignition prevention system according to the invention 8 inside or outside the pressure release valve. (Invention 9)

  According to this invention (invention 9), when the gas component is generated when the power storage device is abnormal, the pressure is increased, and the pressure release valve is opened to release the gas component and prevent the interior from excessively rising. can do. At this time, since the ignition prevention system is provided inside or outside the pressure release valve, when the gas component to be released passes through this ignition prevention system, the non-combustible gas or water system adsorbed by the ignition prevention material in this system. Since the solvent or the non-flammable solvent is desorbed while taking the ambient temperature, the temperature of the gas component can be lowered, and its ignition / explosion can be prevented. Further, since the gas component ejected into the pores generated by the desorption of the originally adsorbed solvent (liquid) and inert gas is adsorbed, the amount of ejected matter can be reduced.

  In the said invention (invention 9), the said electrical storage device is an electric double layer capacitor, a lithium ion battery, or a lithium ion capacitor (invention 10).

  According to the present invention, the non-combustible gas, the aqueous solvent or the non-flammable solvent adsorbed in the pores and on the surface of the porous material is used as the ignition preventing material of the electricity storage device. When gas components such as vaporized electrolyte released from the body and the decomposition gas of the electrolyte pass through this porous material, the non-combustible gas or water-based solvent or non-combustible material adsorbed on this porous material Since the solvent is desorbed while taking the ambient temperature, the temperature of the gas components generated when the power storage device is abnormal can be lowered, and ignition and explosion of these gas components can be prevented. Moreover, since the ejected gas component is adsorbed in the pores generated in the porous material by the desorption of the originally adsorbed liquid and inert gas, the amount of ejected matter can be reduced.

It is a perspective view which shows the square-shaped electrical storage device which concerns on 1st embodiment of this invention. It is sectional drawing which shows schematically the internal structure of the square-shaped electrical storage device which concerns on 1st embodiment of this invention. It is a perspective view which shows roughly the electrical storage system which concerns on 2nd embodiment of this invention. It is a perspective view which shows roughly the electrical storage system which concerns on 3rd embodiment of this invention. It is a perspective view which shows the lamination type electrical storage device which concerns on 4th embodiment of this invention. It is a side view which shows the cylindrical electrical storage device which concerns on 5th embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, each embodiment is only an example, and the present invention is not limited to this.

  1 and 2 show an embodiment of an electricity storage device to which the ignition preventing material of the present invention can be applied. 1 and 2, a nonaqueous electrolyte secondary battery 21 such as a lithium ion battery as an electricity storage device includes a positive electrode terminal 1, a negative electrode terminal 2, and a battery case (housing) 3. A safety valve 4 is formed on the outer peripheral surface. In such a non-aqueous electrolyte secondary battery 21, an electrode body 10 is accommodated in the battery case 3, and the electrode body 10 includes a positive electrode current collector 5 and a positive electrode plate as shown in FIG. 2. 7, the negative electrode current collector 6 and the negative electrode plate 8, and the positive electrode plate 7 and the negative electrode plate 8 have a structure in which they are wound through a separator 9. The positive terminal 1 is electrically connected to the positive electrode plate 7, and the negative terminal 2 is electrically connected to the negative electrode plate 8. The battery case 3 as a housing is, for example, a square battery tank can made of aluminum or stainless steel.

  In the non-aqueous electrolyte secondary battery 21, the safety valve 4 has a role of releasing gas to the outside when the pressure in the battery case 3 is increased due to gas generation or the like. For example, in the case of a lithium ion battery, the safety valve 4 is generally designed to open at about 0.5 to 1.0 MPa.

The positive electrode plate 7 is a current collector in which a positive electrode mixture is held on both surfaces. For example, the current collector is an aluminum foil having a thickness of about 20 μm, and the paste-like positive electrode mixture is polyvinylidene fluoride as a binder to lithium cobalt oxide (LiCoO ₂ ), which is a lithium-containing oxide of a transition metal. And acetylene black as a conductive material are added and kneaded. The positive electrode plate 7 is obtained by applying the paste-like positive electrode mixture on both surfaces of the aluminum foil, followed by drying, rolling, and cutting into a strip.

  The negative electrode plate 8 is a current collector in which a negative electrode mixture is held on both surfaces. For example, the current collector is a copper foil having a thickness of about 10 μm, and the paste-like negative electrode mixture is obtained by adding polyvinylidene fluoride as a binder to graphite powder and then kneading. The negative electrode plate 8 is obtained by applying this paste-like negative electrode mixture on both sides of the copper foil, followed by drying, rolling, and cutting into strips.

  A porous film is used as the separator 9. For example, the separator 9 can be a polyethylene microporous film. The electrolyte solution impregnated in the separator 9 is, for example, 6 mol of 1 mol / L in a mixed solution in which ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) are mixed at a ratio of 1: 1: 1. What added lithium fluorophosphate can be used.

  An ignition prevention material 12 accommodated in the cartridge case 11 is disposed immediately below the safety valve 4 of the non-aqueous electrolyte secondary battery 21 as described above. The cartridge case 11 only needs to be in a form in which a gas component such as a mesh can be circulated, and examples of the material include metal materials represented by SUS, Al, Al alloy, Mg alloy, Ti alloy, and fluorine resin High-corrosion resistant materials, lightweight materials such as polypropylene and carbon fiber, and composite materials thereof.

  It is preferable to fill the ignition preventing material 12 with a space of about 10 to 50% by volume, for example, rather than filling the cartridge case 11 with full capacity. If the filling rate is less than 50% by volume, the amount of the ignition preventing material 12 is too small, so that there is a possibility that sufficient adsorption of the ejected gas component and the effect of preventing ignition are not obtained. On the other hand, if the filling rate exceeds 90% by volume, the diffusibility of the ejected gas component is deteriorated, the contact efficiency with the ignition preventing material 12 is lowered, and the adsorbing effect of the ejected gas component and the ignition preventing effect may be lowered.

  Here, in the present embodiment, the ignition preventing material 12 is formed by adsorbing a nonflammable gas, an aqueous solvent, or a nonflammable solvent in the pores and on the surface of the porous material. The ignition preventing material 12 is preferably coated with a resin material for the purpose of avoiding contact with the electrode and the electrolytic solution.

  The porous material is not particularly limited as long as it can adsorb nonflammable gas, aqueous solvent, or nonflammable solvent. The function of adsorbing inert gas or water may be physical adsorption on the surface of the material or inside the pores, or it is included by the influence of intermolecular interaction or crystal lattice gaps. There may be.

  As such a porous material, an organic, inorganic, or organic / inorganic composite material can be used, and in particular, an inorganic porous material, a carbon-based material, an organic host compound, a porous organometallic composite material, etc. Can be used.

  Inorganic porous materials include porous silica, metal porous structure, calcium silicate, magnesium silicate, magnesium metasilicate aluminate, zeolite, activated alumina, titanium oxide, apatite, porous glass, magnesium oxide, aluminum silicate Etc. can be used.

  As the carbon-based material, granular activated carbon, fibrous activated carbon, sheet-like activated carbon, graphite, carbon nanotube, fullerene, nanocarbon, or the like can be used.

  Examples of organic host compounds include α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, calixarenes, urea, deoxycholic acid, cholic acid, 1,1,6,6-tetraphenylhexa-2,4- Acetylene alcohols such as diin-1,6-diol, bisphenols such as 1,1-bis (4-hydroxyphenyl) cyclohexane, tetrakisphenols such as 1,1,2,2-tetrakis (4-hydroxyphenyl) ethane , Naphthols such as bis-β-naphthol, carboxylic acid amides such as bis (dicyclohexylamide) diphenate, hydroquinones such as 2,5-di-t-butylhydroquinone, chitin, chitosan, etc. .

  As porous organometallic composite materials, porous organometallic complex compounds called Metal-Organic Frameworks (MOF), organic carboxylates, organoboron compounds, organophosphorus compounds, organoaluminum compounds, organotitanium compounds, organosilicon compounds, An organic zinc compound, an organic magnesium compound, an organic indium compound, an organic tin compound, an organic tellurium compound, an organic gallium compound, or the like can be used.

  The porous material capable of adsorbing these incombustible gas, aqueous solvent or incombustible solvent may be used alone or in combination of two or more materials.

  In the present embodiment, as the nonflammable gas adsorbed in the pores and on the surface of the porous material, one or more gases selected from carbon dioxide, nitrogen, halogen, and rare gases are preferably used. it can.

  Moreover, water, an ionic aqueous solution, etc. can be used suitably as an aqueous solvent adsorb | sucked by the inside of the pore of the porous raw material in this embodiment, and the surface. Other non-flammable solvents can also be used.

The anti-ignition material 12 of the present embodiment in which a non-flammable gas, an aqueous solvent or a non-flammable solvent is adsorbed on the porous material as described above preferably has a specific surface area in the range of 10 to 3000 m ² / g. When the specific surface area of the anti-ignition material 12 is less than 10 m ² / g, not only the amount of adsorption of non-flammable gas, aqueous solvent, etc. is reduced, but also the contact efficiency with the gas component to be ejected is low, so that sufficient ignition prevention effect Is not preferred because it cannot be obtained. On the other hand, even if the specific surface area exceeds 3000 m ² / g, not only the improvement of the ignition prevention effect can be obtained, but also the mechanical strength of the ignition prevention material 12 may be lowered, which is not preferable.

  Moreover, it is preferable that this ignition prevention material 12 has a pore diameter in the range of 0.1 to 10 nm. If the pore diameter is less than 0.1 nm, the diffusion rate of the gas in the pores becomes slow, and it becomes difficult for the gas component to be ejected to enter the pores, so the effect of reducing the amount of ejected gas is obtained. On the other hand, if the pore diameter exceeds 10 nm, the adsorptive power in the pores becomes weak, so that nonflammable gas, aqueous solvent, etc. cannot be retained in the pores, and as a result, the ignition prevention effect may be reduced. This is not preferable.

  Furthermore, it is preferable that the ignition preventing material 12 has a particle size in the range of 0.1 to 5.0 mm. When the particle size is 0.1 mm or less, the contact efficiency with the ejected gas component is deteriorated, so that the ignition prevention effect is lowered. On the other hand, if it exceeds 5.0 mm, the ejected gas component passes through the gaps between the particles of the ignition preventing material 12, which may reduce the ignition preventing effect.

  In the present embodiment, for the purpose of improving the substantial average particle diameter of the ignition preventing material 12 as described above, it may be molded using an appropriate method. Although there is no restriction | limiting in particular in the shape of a molded article, In consideration of the diffusibility of the gas component to eject, a filling property, and the ease of handling, it is preferable to set it as shapes, such as a granule, a granule, a bead, a pellet, and a honeycomb.

  As described above, by disposing the ignition preventing material 12 of the present embodiment just before the safety valve 4 of the non-aqueous electrolyte secondary battery 21, the vaporized electrolytic solution or electrolysis generated when the non-aqueous electrolyte secondary battery 21 is abnormal. Gas components such as liquid decomposition gas pass through the ignition preventing material 12 when being released as the safety valve 4 is opened. At this time, the nonflammable gas, the aqueous solvent, or the nonflammable solvent adsorbed on the ignition preventing material 12 (porous material) is desorbed from the inside and the surface of the porous material while taking away the ambient temperature. The temperature of the gas component generated when the water electrolyte type secondary battery 21 is abnormal can be lowered, and ignition and explosion of these gas components can be prevented. In addition, since the ejected gas component is adsorbed in the pores generated by the desorption of the originally adsorbed liquid or inert gas, the amount of ejected matter can be reduced.

  Next, a second embodiment of the present invention will be described in detail with reference to FIG. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 3, the present embodiment is a power storage system in which a nonaqueous electrolyte secondary battery 21 such as a lithium ion battery as a plurality of power storage devices is housed in a pressure-resistant container 32 having a safety valve 31 as a pressure release valve. is there. In this power storage system, a mesh-like cartridge case 11 filled with an ignition prevention material 12 is disposed immediately before the safety valve 31.

  As described above, by disposing the ignition preventing material 12 immediately before the safety valve 31 of the pressure vessel 32 containing the non-aqueous electrolyte secondary batteries 21 as a plurality of power storage devices, the abnormality of the non-aqueous electrolyte secondary battery 21 is detected. Gas components such as vaporized electrolytic solution and decomposition gas of the electrolytic solution that are sometimes generated are filled in the pressure vessel 32, and when a predetermined pressure is exceeded, the safety valve 31 is opened, the gas component is released, and the ignition preventing material 12 is removed. Will pass. At this time, since the nonflammable gas, the aqueous solvent or the nonflammable solvent adsorbed on the ignition preventing material 12 (porous material) is desorbed while taking the ambient temperature, the nonaqueous electrolyte secondary battery 21 is abnormal. The temperature of gas components generated in the gas can be lowered, and ignition and explosion of these gas components can be prevented.

  Furthermore, a third embodiment of the present invention will be described in detail with reference to FIG. In this embodiment, in the second embodiment described above, instead of arranging the mesh-like cartridge case 11 filled with the ignition preventing material 12 immediately before the safety valve 31, the ignition preventing material filling container filled with the ignition preventing material 12 is used. 13 has the same configuration except that 13 is provided immediately after the safety valve 31 as a pressure release valve.

  As described above, it is also possible to arrange the ignition prevention material filling container 13 filled with the ignition prevention material 12 outside the safety valve 31 of the pressure vessel 32 containing the non-aqueous electrolyte type secondary battery 21 as an electricity storage device. The substantially same effect as the embodiment can be obtained.

  As described above, the present invention has been described in detail based on the above-described embodiment. However, the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, the first embodiment relates to a rectangular electricity storage device (non-aqueous electrolyte secondary battery 21), but as shown in FIG. 5, a positive electrode current collector, a positive electrode plate, a negative electrode current collector, a negative electrode Laminated battery storage device (non-aqueous electrolyte) comprising a battery case 3 having a built-in electrode plate, a positive electrode terminal 1 and a negative electrode terminal 2 and a safety valve 4 formed on the outer peripheral surface of the battery case 3 The present invention can also be applied to the secondary battery 21a).

  Further, as shown in FIG. 6, a cylindrical battery case 3 incorporating a positive electrode current collector, a positive electrode plate, a negative electrode current collector, a negative electrode plate, and the like, a positive electrode terminal 1, and a negative electrode terminal 2 are provided. The present invention can also be applied to a cylindrical power storage device (nonaqueous electrolyte secondary battery 21b) in which a safety valve (not shown) is formed on the outer peripheral surface of the battery case 3.

  Furthermore, in the present embodiment, the case of a power storage device and a non-aqueous electrolyte secondary battery has been described as an example, but the power storage device can be similarly applied to an electric double layer capacitor, a lithium ion capacitor, and the like. .

  The present invention will be described in more detail based on the following examples and comparative examples, but the present invention is not limited to the following examples.

Example 1
Zeolite with a specific surface area of 620 m ² / g, pore size of 0.6 nm, and particle size of 0.7 to 1.0 mm is stored in a constant temperature and humidity chamber of 30 ° C. and 90% RH for 2 days as an ignition prevention material. Using 1.2 mL (0.96 g) of the saturated adsorbed sample, the sample was brought into contact with the ejected matter from the lithium ion battery.

  The ignition preventive material of this electricity storage device was evaluated by visually observing the state when the safety valve of the lithium ion battery was opened and the gas jetted through the ignition preventive material. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are shown in Table 1. In Table 1, the item “ignition” in the evaluation results was evaluated as “x” when the flame went up after passing through the ignition preventing material, and “◯” when the flame did not rise. The item “spark” was evaluated as “X” when a large amount of sparks spouted vigorously, and “△” when the spark rose but the amount was very small. Furthermore, the temperature of the jet gas that passed through the ignition preventing material was measured, and the highest point of the temperature was described as the jet gas temperature.

(Example 2)
As an ignition prevention material, 620 m ² / g, pore size 0.6 nm, particle size 0.7-1.0 mm of zeolite is stored in a constant temperature and humidity chamber of 30 ° C. and 90% RH for 2 days, and moisture is saturated and adsorbed. Using 2.0 mL (1.57 g) of the prepared sample, the appearance when brought into contact with the gas ejected from the lithium ion battery was observed and evaluated in the same manner as in Example 1. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are also shown in Table 1.

(Example 3)
As an ignition prevention material, 620 m ² / g, pore size 0.6 nm, particle size 0.7-1.0 mm of zeolite is stored in a constant temperature and humidity chamber of 30 ° C. and 90% RH for 2 days, and moisture is saturated and adsorbed. Using the 2.9 mL (2.26 g) of the sample thus prepared, the state when it was brought into contact with the jet gas from the lithium ion battery was observed and evaluated in the same manner as in Example 1. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are also shown in Table 1.

(Comparative Example 1)
From the lithium-ion battery in the same manner as in Example 1, using 1.2 mL (0.78 g) of zeolite having a particle size of 620 m ² / g, a pore size of 0.6 nm, and a particle size of 0.7 to 1.0 mm as an ignition prevention material. The appearance when the gas was brought into contact with the gas was visually observed and evaluated. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are also shown in Table 1.

(Comparative Example 2)
As an ignition prevention material, using 2.0 mL (1.19 g) of zeolite having a particle size of 620 m ² / g, a pore size of 0.6 nm, and a particle size of 0.7 to 1.0 mm, from a lithium ion battery in the same manner as in Example 1. The appearance when the gas was brought into contact with the gas was visually observed and evaluated. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are also shown in Table 1.

(Comparative Example 3)
As an ignition prevention material, 2.9 mL (1.19 g) of zeolite having a particle size of 620 m ² / g, a pore size of 0.6 nm, and a particle size of 0.7 to 1.0 mm was used in the same manner as in Example 1 and from a lithium ion battery. The appearance when the gas was brought into contact with the gas was visually observed and evaluated. Moreover, the temperature at the time of passing through the ignition preventing material was also measured. These results are also shown in Table 1.

  As is clear from Table 1, by bringing the ignition preventing materials of Examples 1 to 3 into contact with the ejection gas from the electricity storage device, the temperature of the ejection gas can be lowered, and the risk of ignition even by visual observation. It can be seen that can be reduced.

  Since the ignition prevention material of the present invention as described above can reduce the ignition risk when the safety valve of the electricity storage device is opened, the industrial applicability is extremely high as a consideration for the safety and environmental issues of the electricity storage device and the electricity storage system. large.

1 ... Positive terminal (positive electrode)
2 ... Negative terminal (negative electrode)
4 ... Safety valve 9 ... Separator 10 ... Electrode body (battery element)
12 ... Fire prevention material 21, 21a, 21b ... Non-aqueous electrolyte type secondary battery (power storage device)
31 ... Safety valve (pressure release valve)

Claims (9)

The pores and the surface of the porous material to adsorb the non-flammable gas or aqueous solvents or non-flammable solvent Ri Na,
An ignition preventing material for an electricity storage device, wherein the porous material has a specific surface area of 10 to 3000 m ² / g .   The ignition preventive material for an electricity storage device according to claim 1, wherein the aqueous solvent is water or an aqueous solution.   The ignition preventive material for an electricity storage device according to claim 1, wherein the nonflammable gas is one or more of carbon dioxide, nitrogen, halogen, and a rare gas. The porous material, fire prevention materials of the electric storage device according to any one of claims 1 to 3, characterized by having a pore size of 0.1 to 10 nm. The ignition preventive material for an electricity storage device according to any one of claims 1 to 4 , wherein the first porous material has an average particle diameter of 0.1 to 5.0 mm. The ignition preventive material for an electricity storage device according to any one of claims 1 to 5 , wherein the porous material is a molded product obtained by processing a porous powdery material. An ignition prevention system using the ignition prevention material for an electricity storage device according to any one of claims 1 to 6 . A power storage system comprising a battery element formed by winding or laminating a positive electrode and a negative electrode with a separator interposed therebetween and an electrolyte solution, wherein the power storage device and the power storage system are both predetermined. A power storage system comprising a pressure release valve that is opened by pressure, wherein the ignition prevention system according to claim 7 is installed inside or outside the pressure release valve. The power storage system according to claim 8 , wherein the power storage device is an electric double layer capacitor, a lithium ion battery, or a lithium ion capacitor.

Images