Battery pack

Abstract

The power storage pack (1) includes: at least one power storage device (2) having an exhaust portion (36) for discharging gas generated inside; a porous portion (4) having a structure composed of a plurality of fire extinguishing agent particles (38) and having a gap (40) inside; and a housing (6) that accommodates the power storage device (2) and the porous portion (4). Each fire extinguishing agent particle (38) is an aggregate of a plurality of fire extinguishing agent powders, and the porous portion (4) is arranged so that gas flows in the gap (40).

Description

Technical Field

[0001] The present disclosure relates to a power storage pack. Background Art

[0002] Power storage devices such as lithium-ion secondary batteries are now practically used as power sources for mobile electronic devices such as mobile phones and notebook personal computers. Furthermore, power storage devices are used not only for small consumer applications but also as power sources for vehicles.

[0003] Typically, a plurality of power storage devices are housed within a housing and used in the form of a power storage pack. Furthermore, the power storage device typically has an exhaust portion that discharges high-temperature, high-pressure gas when gas is generated internally and the internal pressure increases. The gas discharged from the exhaust portion contains flammable gas and particles such as fragments of components constituting the power storage device. When the flammable gas and high-temperature particles are discharged outside the housing, and the flammable gas, high-temperature particles, and oxygen outside the pack are all present, a fire may occur. As a countermeasure against such a fire, for example, Patent Document 1 discloses a battery module in which a fire extinguishing container for storing fire extinguishing agent powder is disposed within an exhaust passage within the housing. In this battery module, the fire extinguishing container breaks due to the heat of the gas discharged from the battery, and the fire extinguishing agent powder within the container is ejected into the exhaust passage, whereby the fire extinguishing agent powder acts on the exhaust gas to suppress a fire outside the pack.

[0004] [Prior Art Literature]

[0005] [Patent Document]

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-54973 Summary of the Invention

[0007] [Problems to be Solved by the Invention]

[0008] In the above-mentioned conventional structure, the fire extinguishing agent powder can be held in a fixed position by storing it in a fire extinguishing container. However, because the fire extinguishing agent powder is enclosed in the fire extinguishing container, the fire extinguishing effect of the fire extinguishing agent powder may be delayed compared to the case where the fire extinguishing agent powder is not stored in the fire extinguishing container. The delayed fire extinguishing effect may lead to a reduction in the reliability of the battery pack. Different from this, for example, it is considered to form the fire extinguishing agent powder into a sheet and arrange it in the housing. However, if a sheet composed of a dense collection of fire extinguishing agent powder is arranged in the exhaust passage, the flow of the exhaust gas will be blocked by the sheet of fire extinguishing agent powder, and the exhaust gas will produce a very large pressure loss when passing through the area where the fire extinguishing agent sheet is arranged. If this pressure loss is too large, it may cause the housing of the battery pack to be damaged, resulting in a reduction in the reliability of the battery pack.

[0009] The present disclosure has been made in view of the above circumstances, and one of its objects is to provide a technology for improving the reliability of a power storage pack.

[0010] [Technical solutions for solving technical problems]

[0011] One aspect of the present disclosure is a power storage pack. The power storage pack includes: at least one power storage device having an outer body and an exhaust portion for exhausting gas generated within the outer body; a porous portion having a structure composed of a plurality of fire extinguishing agent particles and having a void therein; and a housing that houses the power storage device and the porous portion. Each fire extinguishing agent particle is an aggregate of a plurality of fire extinguishing agent powders, and the porous portion is arranged so that gas flows through the voids.

[0012] Another embodiment of the present disclosure is a power storage pack. The power storage pack includes: at least one power storage device having an outer housing and an exhaust portion for exhausting gas generated within the outer housing; a fire extinguisher tablet comprising a plurality of fire extinguisher powders and having a through-hole; and a housing that houses the power storage device and the fire extinguisher tablet. The fire extinguisher tablet is arranged so that gas flows through the through-hole.

[0013] Optional combinations of the above-described constituting elements and modes in which the expressions of the present disclosure are converted into methods, apparatuses, systems, etc. are also applicable as modes of the present disclosure.

[0014] [Effects of the Invention]

[0015] According to the present disclosure, the reliability of the power storage pack can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view schematically showing the power storage pack according to the first embodiment.

[0017] Figure 2 It is a cross-sectional view of the power storage device.

[0018] Figure 3 It is a cross-sectional view schematically showing a power storage pack according to the second embodiment.

[0019] Figure 4 It is a cross-sectional view schematically showing a power storage pack according to a third embodiment.

[0020] Figure 5 It is a cross-sectional view of the power storage device.

[0021] Figure 6 It is a three-dimensional diagram of a fire extinguishing agent tablet.

[0022] Figure 7 It is a cross-sectional view schematically showing a power storage pack according to a fourth embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, the present disclosure will be described based on preferred embodiments and with reference to the accompanying drawings. The embodiments do not limit the present disclosure but are illustrative, and all the features and combinations thereof described in the embodiments are not necessarily the essential contents of the present disclosure. The same or equivalent components, members, and processes shown in the drawings are marked with the same figure marks, and repeated descriptions are appropriately omitted. In addition, for ease of description, the scales and shapes of the various parts shown in the figures are conveniently set, and no restrictive interpretation is given unless otherwise specified. In addition, when terms such as "first" and "second" are used in this specification or the claims, unless otherwise specified, the terms do not indicate any order or importance, but are used to distinguish a certain structure from other structures. In addition, in the drawings, part of unimportant components is omitted on the basis of describing the embodiment.

[0024] (Implementation Method 1)

[0025] Figure 1 It is a cross-sectional view schematically showing the power storage pack according to the first embodiment. Figure 1 The internal structure of the power storage device 2 is omitted in the figure. The power storage pack 1 includes a plurality of power storage devices 2, a porous portion 4, and a case 6.

[0026] The power storage device 2 is, for example, a rechargeable secondary battery such as a lithium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, or a capacitor such as an electric double-layer capacitor. In this embodiment, the power storage device 2 is a so-called cylindrical battery. Alternatively, the power storage device 2 may be a prismatic battery. While the power storage pack 1 in this embodiment includes multiple power storage devices 2, the number of power storage devices 2 is not limited; it is sufficient that the power storage pack 1 includes at least one power storage device 2.

[0027] Figure 2 It is a cross-sectional view of the power storage device 2. The power storage device 2 has a well-known structure. As an example, the power storage device 2 has a structure in which an electrode group 14 is housed together with a non-aqueous electrolyte in an outer casing 16 with a bottom. The electrode group 14 has a structure in which a positive electrode 8 and a negative electrode 10 are wound with a separator 12 therebetween. In the outer casing 16, an insulating plate 18 and an insulating plate 20 are arranged so as to sandwich the electrode group 14. In addition, the power storage device 2 has a positive electrode lead 22, a filter 24, a negative electrode lead 26, an inner cover 28, a valve body 30, a terminal plate 32, and a gasket 34. The filter 24, the inner cover 28, the valve body 30, and the terminal plate 32 constitute a sealing body that closes the opening of the outer casing 16. The insulating plate 18 is arranged on the sealing body side, and the insulating plate 20 is arranged on the bottom side of the outer casing 16.

[0028] The positive electrode 8 is joined to a filter 24 via a positive electrode lead 22. The filter 24 is connected to an inner lid 28. The inner lid 28 has a protrusion, which is joined to a metal valve body 30 via the protrusion. The valve body 30 is connected to a terminal plate 32. The terminal plate 32 functions as the positive electrode terminal 2a. The negative electrode 10 is joined to the bottom of the outer body 16 via a negative electrode lead 26. The bottom of the outer body 16 functions as the negative electrode terminal 2b. A gasket 34 is interposed between the sealing body and the outer body 16 to insulate them from each other.

[0029] The insulating plate 18 has a through-hole 18a that connects the space on the electrode group 14 side and the space on the filter 24 side. The filter 24 has a through-hole 24a that connects the space on the insulating plate 18 side and the space on the inner cover 28 side. The inner cover 28 has a through-hole 28a that connects the space on the filter 24 side and the space on the valve body 30 side. When an abnormality such as an internal short circuit occurs in the power storage device 2, and gas is generated from the electrode group 14, the gas flows from the electrode group 14 through the through-hole 18a, the through-hole 24a, and the through-hole 28a to the valve body 30. As gas continues to be generated and the pressure in the outer body 16 increases, the valve body 30 expands toward the terminal plate 32. If the valve body 30 and the inner cover 28 separate due to this expansion, the current path is cut off.

[0030] If the pressure inside the outer casing 16 further increases, the valve body 30 ruptures. As a result, the gas inside the outer casing 16 reaches the terminal plate 32 via the through-holes 18a, 24a, 28a, and the cracks in the valve body 30. The terminal plate 32 has a through-hole 32a that connects the space on the valve body 30 side with the outside of the outer casing 16. Therefore, the gas that reaches the terminal plate 32 is discharged to the outside of the outer casing 16 via the through-hole 32a.

[0031] Thus, through-holes 18a of insulating plate 18, through-holes 24a of filter 24, through-holes 28a of inner cover 28, and through-holes 32a of valve body 30 and terminal plate 32 constitute exhaust portion 36 for exhausting gas generated within exterior body 16. The structure of exhaust portion 36 is not limited to the above-described structure. Alternatively, exhaust portion 36 may be provided within exterior body 16.

[0032] like Figure 1 As shown, multiple power storage devices 2 are laid out in a predetermined posture within the housing 6. As an example, the multiple power storage devices 2 are positioned so that their positive terminals 2a and negative terminals 2b are aligned along a predetermined first direction X. Furthermore, the power storage devices 2 are arranged in a matrix in the first direction X and a second direction Y. The second direction Y is a direction orthogonal to the first direction X.

[0033] Figure 1The middle figure shows a situation where a plurality of storage devices 2 are laid out in two columns in the first direction X and in multiple rows in the second direction Y. Two storage devices 2 are arranged in the first column, and three storage devices 2 are arranged in the second column. In addition, the posture of each storage device 2 is determined so that the positive terminal 2a is facing the center side of the housing 6 in the first direction X. The positive terminals 2a of the two storage devices 2 in the first column and the positive terminals 2a of the two storage devices 2 in the second column face each other. In this state, a positive-side current collector plate (not shown) is connected to the positive terminal 2a of each storage device 2, and a negative-side current collector plate (not shown) is connected to the negative terminal 2b of each storage device 2. Thus, the storage devices 2 are electrically connected.

[0034] The porous portion 4 has a structure in which a plurality of fire extinguishing agent particles 38 are assembled and stacked. Each fire extinguishing agent particle 38 is an aggregate of a plurality of fire extinguishing agent powders. The fire extinguishing agent powder is composed of well-known ingredients such as first ammonium phosphate, sodium bicarbonate, potassium bicarbonate, potassium acetate, and tripotassium citrate. The fire extinguishing agent particles 38 are obtained, for example, by kneading and shaping the fire extinguishing agent powder with a binder. Alternatively, the fire extinguishing agent particles 38 can also be obtained by compression molding of the fire extinguishing agent powder. The fire extinguishing agent particles 38 are preferably spherical, prolate, or oblate, but are not limited thereto and may also be polygonal, such as a cube. The porous portion 4 has voids 40 inside. The voids 40 are spaces divided by the assembled plurality of fire extinguishing agent particles 38.

[0035] When the fire extinguisher particles 38 are spherical, their maximum diameter is, for example, 1 mm to 10 mm. By setting the maximum diameter of the fire extinguisher particles 38 to 1 mm or greater, the size of the voids 40 can be ensured, thereby preventing excessive pressure loss when the exhaust gas passes through the voids 40. Furthermore, by setting the maximum diameter of the fire extinguisher particles 38 to 10 mm or less, it is possible to prevent a significant decrease in the surface area of ​​the porous portion 4 (the contact area between each fire extinguisher particle 38 and the exhaust gas), which could lead to a delay or weakening of the fire extinguishing effect. The maximum diameter refers to the distance between two points on the surface of the fire extinguisher particle 38 at the point where the distance between the two points is greatest.

[0036] The housing 6 is a container for storing the power storage device 2 and the porous portion 4. The housing 6 of this embodiment has a first storage chamber 42 and a second storage chamber 44. The first storage chamber 42 and the second storage chamber 44 are separated by a wall portion 46. A plurality of power storage devices 2 are stored in the first storage chamber 42 in the above-mentioned arrangement. The porous portion 44 is stored in the second storage chamber 44. For example, the second storage chamber 44 is filled with a plurality of fire extinguishing agent particles 38 that are not bonded to each other. The shape of the aggregate of the fire extinguishing agent particles 38 is maintained by the inner wall surface of the second storage chamber 44, thereby forming the porous portion 4. Therefore, the fire extinguishing agent powder is arranged in a state exposed inside the housing 6.

[0037] Furthermore, the present invention is not particularly limited to this configuration. A plurality of fire extinguishing agent particles 38 may be bonded together in advance to form a porous portion 4, and the porous portion 4 may be housed in the second housing chamber 44. In this case, the wall portion 46 may be omitted. If the wall portion 46 is omitted, the porous portion 4 can be fixed to the wall surface of the housing 6 by bonding or the like.

[0038] The porous portion 4 is arranged within the housing 6 so that gas exhausted from the power storage device 2 flows through the gap 40. In this embodiment, the housing 6 has a through-hole 48 in the wall 46 that separates the first storage chamber 42 from the second storage chamber 44. The interior space of the first storage chamber 42 and the interior space of the second storage chamber 44 are connected via the through-hole 48. As a result, the gas discharged from the power storage device 2 flows into the second storage chamber 44 via the through-hole 48 and can flow through the gap 40 of the porous portion 4.

[0039] When the fire extinguisher particles 38 constituting the porous portion 4 come into contact with gas, the fire extinguisher powder comprising the fire extinguisher particles 38 reacts with the heat of the gas. The reactants produced by this reaction act as a negative catalyst, inhibiting the fuel chain reaction. As a result, ignition caused by the gas exhausted from the power storage device 2 can be suppressed.

[0040] The case 6 of this embodiment has an opening 50. The opening 50 opens, at least after gas is released, to connect the inside and outside of the case 6. For example, the opening 50 may be formed from a thin-walled portion that is thinner than another portion provided on a portion of the outer wall of the case 6. When the internal pressure of the case 6 increases due to gas release from the power storage device 2, the opening 50 ruptures and opens. When the inside and outside of the case 6 are connected through the opening 50, a gas flow path 52 is formed within the case 6, extending from the exhaust port 36 of the power storage device 2 to the opening 50.

[0041] Furthermore, multiple power storage devices 2 are housed in the first storage chamber 42. Consequently, multiple gas flow paths 52 are formed within the housing 6, extending from the exhaust ports 36 of each power storage device 2 to the opening 50. The multiple gas flow paths 52 extend toward the common opening 50. Therefore, each gas flow path 52 has a convergent portion 52a where the gas flow paths converge, at least in part. In other words, each gas flow path 52 forms a single flow path in at least a portion of its section.

[0042] In this embodiment, second storage chamber 44 is provided so as to be in contact with the outer wall of housing 6. Furthermore, opening 50 is arranged so as to connect the exterior of housing 6 with the interior space of second storage chamber 44. Therefore, the interior space of second storage chamber 44 communicates with the interior space of first storage chamber 42 via through-hole 48, and communicates with the exterior of housing 6 via opening 50. Thus, the interior space of second storage chamber 44 constitutes a portion of gas flow path 52.

[0043] The porous portion 4 is housed in the second storage chamber 44. Therefore, the porous portion 4 is positioned within the gas flow path 52. The void 40 extends continuously from the end of the porous portion 4 on the opening 50 side to the end on the through-hole 48 side, thereby constituting a portion of the gas flow path 52. Furthermore, the gas exhausted from the exhaust portion 36 of each power storage device 2 passes through the through-hole 48 into the second storage chamber 44 and reaches the opening 50. Therefore, the interior space of the second storage chamber 44 constitutes the converged portion 52a of the gas flow path 52. Therefore, the porous portion 4 within the second storage chamber 44 is positioned within the converged portion 52a.

[0044] As described above, the opening 50 is arranged to connect the interior space of the second storage chamber 44 with the outside of the housing 6. The porous portion 4 extends over the entire second storage chamber 44. Therefore, the porous portion 4 is arranged to cover the opening 50.

[0045] As described above, the energy storage pack 1 of this embodiment includes: at least one energy storage device 2 having an exterior body 16 and an exhaust portion 36 for exhausting gas generated within the exterior body 16; a porous portion 4 having a structure composed of a plurality of fire extinguishing agent particles 38 and having a void 40 therein; and a housing 6 that houses the energy storage device 2 and the porous portion 4. Each fire extinguishing agent particle 38 is an aggregate of a plurality of fire extinguishing agent powders. The porous portion 4 is arranged within the housing 6 such that gas exhausted from the energy storage device 2 flows through the void 40. This allows gas exhausted from the energy storage device 2 to come into contact with the fire extinguishing agent powder, and the negative catalytic effect of the fire extinguishing agent powder can suppress ignition caused by the exhaust gas.

[0046] In a configuration where dense extinguishing agent sheets are placed within the exhaust flow path, the flow of exhaust gas is obstructed by the extinguishing agent powder sheet, resulting in significant pressure loss. This pressure loss can cause an excessive increase in the internal pressure of the housing, potentially damaging the housing. Alternatively, the exhaust gas may bypass the extinguishing agent sheet and escape from the housing, potentially preventing adequate fire extinguishing effectiveness.

[0047] In contrast, in this embodiment, the porous portion 4 is formed of fire extinguishing agent particles 38, which are aggregates of fire extinguishing agent powder. This allows gas to flow through the gaps 40 of the porous portion 4. This reduces the pressure loss of exhaust gas when it is discharged outside the housing 6. Therefore, according to this embodiment, damage to the housing 6 can be suppressed, and a higher fire extinguishing effect can be achieved. Consequently, the reliability of the power storage pack 1 can be improved.

[0048] Furthermore, in conventional structures that eject fire extinguishing agent powder by rupturing a fire extinguishing container, the container takes time to rupture, resulting in a time lag between the discharge of gas and the discharge of the fire extinguishing agent. Consequently, a sufficient fire extinguishing effect may not be achieved. Furthermore, the specific surface area of ​​fire extinguishing agent powder is very large. Therefore, when the fire extinguishing agent powder is ejected, each individual particle of the fire extinguishing agent reacts rapidly with the exhaust gas. Furthermore, most of the fire extinguishing agent powder is exerted at once. Meanwhile, the discharge of gas from the power storage device 2 generally lasts from several seconds to tens of seconds. Therefore, when the fire extinguishing agent powder is ejected, the fire extinguishing agent powder is depleted in the initial stages of gas discharge, potentially preventing a sufficient fire extinguishing effect. Furthermore, when the fire extinguishing agent powder is ejected, unreacted fire extinguishing agent powder is compressed by the exhaust gas and dispersed, potentially preventing a sufficient fire extinguishing effect.

[0049] In contrast, in this embodiment, the fire extinguishing agent powder is arranged in the form of fire extinguishing agent particles 38 within the housing 6. Therefore, a container for storing the fire extinguishing agent powder is unnecessary. Consequently, the fire extinguishing agent powder can be activated without delay relative to the discharge of gas from the power storage device 2. Furthermore, since the fire extinguishing agent powder reacts with the gas sequentially starting from the surface of the fire extinguishing agent particles 38, the rate of consumption of the fire extinguishing agent powder can be delayed. Therefore, the fire extinguishing effect of the fire extinguishing agent powder can be sustained for a long period of time. Furthermore, the fire extinguishing agent powder can be prevented from being expelled by the exhaust gas. Therefore, according to this embodiment, a higher fire extinguishing effect can be achieved. Consequently, the reliability of the power storage pack 1 can be improved.

[0050] In addition, the porous portion 4 is an aggregate of a plurality of fire extinguishing agent particles 38. Therefore, by adjusting the size and number of the fire extinguishing agent particles 38, the size of the gap 40 (i.e., the size of the pressure loss) and the contact area with the exhaust gas (i.e., the amount of fire extinguishing agent powder that acts on the exhaust gas) can be flexibly adjusted. This allows for flexible responses to the exhaust gas volume or exhaust time that may vary depending on the type of the power storage device 2. In addition, the type of fire extinguishing agent powder can be made different on the center side and the surface side of each fire extinguishing agent particle 38, thereby also achieving an improvement in the fire extinguishing effect. In addition, by forming a gas flow path with the gaps 40, a non-linear gas flow path can be easily formed in the porous portion 4. This allows the gas flow path to be extended, and the gas can be further cooled during the period until it is discharged to the outside of the housing 6.

[0051] Furthermore, the housing 6 of this embodiment has an opening 50 that opens at least after the gas is exhausted to connect the inside and outside of the housing 6. A gas flow path 52 is formed within the housing 6 from the exhaust portion 36 to the opening 50. Furthermore, the porous portion 4 is disposed in the gas flow path 52. This facilitates contact between the gas exhausted from the power storage device 2 and the fire extinguishing agent particles 38. Consequently, a higher fire extinguishing effect can be achieved.

[0052] Furthermore, the power storage pack 1 includes a plurality of power storage devices 2. Therefore, a plurality of gas flow paths 52 are formed within the housing 6, extending from the exhaust portion 36 of each power storage device 2 to the opening 50. Furthermore, the plurality of gas flow paths 52 have a collection portion 52a where they are collected together. Furthermore, the porous portion 4 is disposed within the collection portion 52a. This increases the number of power storage devices 2 that can be extinguished by one porous portion 4. Therefore, the number of porous portions 4 disposed within the housing 6 can be reduced. Consequently, the size of the power storage pack 1 can be suppressed. Alternatively, the number of power storage devices 2 that can be accommodated within the housing 6 can be increased. Furthermore, the amount of fire extinguishing agent powder used can be reduced.

[0053] Furthermore, in this embodiment, the porous portion 4 is arranged so as to cover the opening 50. This allows the number of electrical storage devices 2 whose fires can be extinguished by a single porous portion 4 to be increased, even when the gas flow paths 52 extending from each electrical storage device 2 do not include the collective portion 52a. Consequently, the number of porous portions 4 arranged within the housing 6 can be reduced. Furthermore, the degree of freedom in the arrangement of the electrical storage devices 2 can be increased.

[0054] (Implementation Method 2)

[0055] Embodiment 2 has the same configuration as Embodiment 1 except for the arrangement of the porous portion 4. Hereinafter, this embodiment will be described focusing on the configurations different from Embodiment 1, and the common configurations will be briefly described or omitted. Figure 3 It is a cross-sectional view schematically showing power storage pack 1 according to the second embodiment. Figure 3 The internal structure of the power storage device 2 is omitted in the figure.

[0056] The energy storage pack 1 includes a plurality of energy storage devices 2, a porous portion 4, and a case 6. The plurality of energy storage devices 2 are arranged in a predetermined position within the case 6. In this embodiment, the plurality of energy storage devices 2 are arranged in a matrix of three rows and two columns in the first direction X and the second direction Y. Furthermore, the energy storage devices 2 in the first column and the energy storage devices 2 in the second column are arranged with their positive terminals 2a facing each other. In other words, each energy storage device 2 is positioned in the first direction X with its positive terminal 2a facing the center of the case 6.

[0057] The housing 6 has a space in the center portion in the first direction X, which is sandwiched between the group of energy storage devices 2 in the first row and the group of energy storage devices 2 in the second row. This space communicates with the exhaust portion 36 of each energy storage device 2. Therefore, gas generated within each energy storage device 2 is discharged from the exhaust portion 36 into this space. Consequently, this space constitutes a shared exhaust region 54 for exhausting gas from each energy storage device 2. The shared exhaust region 54 is, for example, a region defined by the surface on the positive electrode terminal 2a side of the plurality of energy storage devices 2 and two wall surfaces of the housing 6 that face each other in directions perpendicular to the first direction X and the second direction Y.

[0058] The porous portion 4, which has a structure in which a plurality of fire extinguishing agent particles 38 are aggregated, is arranged in the shared exhaust region 54. For example, the plurality of fire extinguishing agent particles 38 are preliminarily bonded together to form the porous portion 4, and the porous portion 4 is arranged in the shared exhaust region 54. The porous portion 4 is fixed to the shared exhaust region 54 by, for example, bonding to the wall surface of the housing 6. By arranging the porous portion 4 in the shared exhaust region 54, the gas exhausted from each power storage device 2 can flow into the voids 40 of the porous portion 4. The arrangement of the porous portion 4 in the shared exhaust region 54 can also be considered as the arrangement of the porous portion 4 in the gas flow path 52 for the gas exhausted from each power storage device 2. Furthermore, when viewed in the direction of gas travel, the entire periphery of the porous portion 4 may not abut against the inner wall of the housing 6 that defines the space housing the porous portion 4.

[0059] This configuration also achieves the same effects as in Embodiment 1. Furthermore, as in Embodiment 1, only one power storage device 2 may be provided in this embodiment. In this case, by arranging the porous portion 4 so as to face the exhaust portion 36 of the power storage device 2, the gas exhausted from the power storage device 2 can be easily flowed into the voids 40 of the porous portion 4.

[0060] Above, embodiments 1 and 2 of the present disclosure are described in detail. The above embodiments are merely embodiments showing specific examples of implementing the present disclosure. The contents of the embodiments do not limit the technical scope of the present disclosure, and various design changes such as changes, additions, and deletions of constituent elements can be made without departing from the scope of the idea of ​​the invention specified in the claims. The new embodiment with the design changes has the effects of the combined embodiment and the deformation. In the above embodiments, the contents that can be subjected to design changes are emphasized by expressions such as "in this embodiment" and "in this embodiment", but contents without such expressions also allow design changes. In addition, any combination of the constituent elements included in each embodiment is also valid as a mode of the present disclosure. The hatching marked on the cross section of the accompanying drawings does not limit the material of the object marked with the hatching.

[0061] The number and shape of porous portion 4 disposed in case 6 or openings 50 of case 6 are not particularly limited. The outer shape of power storage device 2 or case 6, the internal structure of power storage device 2, etc. are also not particularly limited.

[0062] (Implementation 3)

[0063] Figure 4 It is a cross-sectional view schematically showing a power storage pack according to a third embodiment. Figure 4 The internal structure of the power storage device 2 is omitted from the illustration. The power storage pack 1 includes a plurality of power storage devices 2, a fire extinguishing agent sheet 60, and a case 6.

[0064] The power storage device 2 is, for example, a rechargeable secondary battery such as a lithium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, or a capacitor such as an electric double-layer capacitor. In this embodiment, the power storage device 2 is a so-called cylindrical battery. Alternatively, the power storage device 2 may be a prismatic battery. While the power storage pack 1 in this embodiment includes multiple power storage devices 2, the number of power storage devices 2 is not limited; it is sufficient that the power storage pack 1 includes at least one power storage device 2.

[0065] Figure 5 It is a cross-sectional view of the power storage device 2. The power storage device 2 has a well-known structure. As an example, the power storage device 2 has a structure in which an electrode group 14 is housed together with a non-aqueous electrolyte in an outer casing 16 with a bottom. The electrode group 14 has a structure in which a positive electrode 8 and a negative electrode 10 are wound with a separator 12 therebetween. In the outer casing 16, an insulating plate 18 and an insulating plate 20 are arranged so as to sandwich the electrode group 14. In addition, the power storage device 2 has a positive electrode lead 22, a filter 24, a negative electrode lead 26, an inner cover 28, a valve body 30, a terminal plate 32, and a gasket 34. The filter 24, the inner cover 28, the valve body 30, and the terminal plate 32 constitute a sealing body that closes the opening of the outer casing 16. The insulating plate 18 is arranged on the sealing body side, and the insulating plate 20 is arranged on the bottom side of the outer casing 16.

[0066] The positive electrode 8 is joined to a filter 24 via a positive electrode lead 22. The filter 24 is connected to an inner lid 28. The inner lid 28 has a protrusion, which is joined to a metal valve body 30 via the protrusion. The valve body 30 is connected to a terminal plate 32. The terminal plate 32 functions as the positive electrode terminal 2a. The negative electrode 10 is joined to the bottom of the outer body 16 via a negative electrode lead 26. The bottom of the outer body 16 functions as the negative electrode terminal 2b. A gasket 34 is interposed between the sealing body and the outer body 16 to insulate them from each other.

[0067] The insulating plate 18 has a through-hole 18a that connects the space on the electrode group 14 side and the space on the filter 24 side. The filter 24 has a through-hole 24a that connects the space on the insulating plate 18 side and the space on the inner cover 28 side. The inner cover 28 has a through-hole 28a that connects the space on the filter 24 side and the space on the valve body 30 side. When an abnormality such as an internal short circuit occurs in the power storage device 2, and gas is generated from the electrode group 14, the gas flows from the electrode group 14 through the through-hole 18a, the through-hole 24a, and the through-hole 28a to the valve body 30. As the generation of gas progresses and the pressure in the outer body 16 increases, the valve body 30 expands toward the terminal plate 32. If the valve body 30 and the inner cover 28 separate due to this expansion, the current path is cut off.

[0068] If the pressure inside the outer casing 16 further increases, the valve body 30 ruptures. As a result, the gas inside the outer casing 16 reaches the terminal plate 32 via the through-holes 18a, 24a, 28a, and the cracks in the valve body 30. The terminal plate 32 has a through-hole 32a that connects the space on the valve body 30 side with the outside of the outer casing 16. Therefore, the gas that reaches the terminal plate 32 is discharged to the outside of the outer casing 16 via the through-hole 32a.

[0069] Thus, through-holes 18a of insulating plate 18, through-holes 24a of filter 24, through-holes 28a of inner cover 28, and through-holes 32a of valve body 30 and terminal plate 32 constitute exhaust portion 36 for exhausting gas generated within exterior body 16. The structure of exhaust portion 36 is not limited to the above-described structure. Alternatively, exhaust portion 36 may be provided within exterior body 16.

[0070] like Figure 4 As shown, multiple power storage devices 2 are laid out in a predetermined posture within the housing 6. As an example, the multiple power storage devices 2 are positioned so that their positive terminals 2a and negative terminals 2b are aligned along a predetermined first direction X. Furthermore, the power storage devices 2 are arranged in a matrix in the first direction X and a second direction Y. The second direction Y is a direction orthogonal to the first direction X.

[0071] Figure 4 The middle figure shows a situation where a plurality of storage devices 2 are laid out in two columns in the first direction X and in multiple rows in the second direction Y. Two storage devices 2 are arranged in the first column, and three storage devices 2 are arranged in the second column. In addition, the posture of each storage device 2 is determined so that the positive terminal 2a is facing the center side of the housing 6 in the first direction X. The positive terminals 2a of the two storage devices 2 in the first column and the positive terminals 2a of the two storage devices 2 in the second column face each other. In this state, a positive-side current collector plate (not shown) is connected to the positive terminal 2a of each storage device 2, and a negative-side current collector plate (not shown) is connected to the negative terminal 2b of each storage device 2. Thus, the storage devices 2 are electrically connected.

[0072] The fire extinguishing agent sheet 60 is a plate-like body composed of a plurality of fire extinguishing agent powders. The fire extinguishing agent powders are composed of well-known ingredients such as first ammonium phosphate, sodium bicarbonate, potassium bicarbonate, potassium acetate, and tripotassium citrate. The fire extinguishing agent sheet 60 is obtained, for example, by kneading the fire extinguishing agent powders with a binder and then shaping them. Alternatively, the fire extinguishing agent sheet 60 can be obtained by compression molding the fire extinguishing agent powders.

[0073] Figure 6 60 is a perspective view of the fire extinguishing agent sheet. Figure 4 and Figure 6As shown, the fire extinguishing agent sheet 60 has through-holes 62 extending through the sheet in the thickness direction. The fire extinguishing agent sheet 60 of this embodiment is square in shape and has a plurality of through-holes 62 arranged in a matrix. Each through-hole 62 is circular when viewed normal to the fire extinguishing agent sheet 60. The shapes of the fire extinguishing agent sheet 60 and through-holes 62 can be modified as appropriate.

[0074] The thickness of the fire extinguishing agent sheet 60 is, for example, 0.5 mm to 10 mm. By setting the thickness of the fire extinguishing agent sheet 60 to 0.5 mm or greater, a shortage of fire extinguishing agent powder can be prevented. Furthermore, by setting the thickness of the fire extinguishing agent sheet 60 to 10 mm or less, the fire extinguishing agent powder inside the fire extinguishing agent sheet 60 can be prevented from remaining unreacted and being wasted. Furthermore, the diameter of the through-hole 62 is, for example, 1 mm to 3 mm. By setting the diameter of the through-hole 62 to 1 mm or greater, excessive pressure loss of exhaust gas passing through the through-hole 62 can be prevented. Furthermore, by setting the diameter of the through-hole 62 to 3 mm or less, the amount of exhaust gas that passes through without sufficient contact with the fire extinguishing agent powder can be reduced. The thickness of the fire extinguishing agent sheet 60 is, for example, an average thickness. The diameter of the through-hole 62 is, for example, the distance between two points on the outer circumference of the through-hole 62 at the point where the distance between the two points is greatest, as viewed from the normal direction of the fire extinguishing agent sheet 60.

[0075] The housing 6 is a container for storing the power storage device 2 and the fire extinguishing agent tablet 60. The housing 6 of this embodiment has a first storage chamber 42 and a second storage chamber 44. The first storage chamber 42 and the second storage chamber 44 are separated by a wall portion 46. A plurality of power storage devices 2 are stored in the first storage chamber 42 in the above-mentioned laying manner. The fire extinguishing agent tablet 60 is stored in the second storage chamber 44. Therefore, the fire extinguishing agent powder is arranged in a state exposed to the inside of the housing 6. For example, the peripheral edge of the fire extinguishing agent tablet 60 is fixed to the wall surface of the housing 6 by bonding or the like. Alternatively, a groove may be provided on the wall surface of the housing 6, and the fire extinguishing agent tablet 60 may be fixed by inserting the peripheral edge of the fire extinguishing agent tablet 60 into the groove.

[0076] The fire extinguishing agent sheet 60 is arranged within the housing 6 so that the gas exhausted from the power storage device 2 flows through the through-hole 62. The housing 6 of this embodiment has a through-hole 48 in the wall portion 46 that separates the first storage chamber 42 from the second storage chamber 44. The interior spaces of the first storage chamber 42 and the second storage chamber 44 are connected via the through-hole 48. As a result, the gas ejected from the power storage device 2 flows into the second storage chamber 44 via the through-hole 48 and is able to flow through the through-hole 62 of the fire extinguishing agent sheet 60. Even if the fire extinguishing agent sheet 60 is arranged so as to block the flow of the exhaust gas, the exhaust gas can flow through the through-hole 62, thereby suppressing the increase in pressure loss caused by the arrangement of the fire extinguishing agent sheet 60.

[0077] When the fire extinguishing agent powder that makes up the fire extinguishing agent sheet 60 comes into contact with gas, it reacts with the heat of the gas. The reactants generated by this reaction exert a negative catalytic effect, suppressing the fuel chain reaction. As a result, fires caused by gas discharged from the power storage device 2 can be suppressed. Furthermore, the fire extinguishing agent sheet 60 is a sheet with a predetermined thickness. Therefore, compared to powdered fire extinguishing agents, the surface area of ​​the fire extinguishing agent sheet 60, encompassing the inner surface of the through-hole 62 and the main surface of the fire extinguishing agent sheet 60, can be easily adjusted.

[0078] The case 6 of this embodiment has an opening 50. The opening 50 opens, at least after gas is released, to connect the inside and outside of the case 6. For example, the opening 50 may be formed from a thin-walled portion that is thinner than another portion of the outer wall of the case 6. When the internal pressure of the case 6 increases due to gas release from the power storage device 2, the opening 50 ruptures and opens. When the inside and outside of the case 6 are connected through the opening 50, a gas flow path 52 is formed within the case 6, extending from the exhaust port 36 of the power storage device 2 to the opening 50.

[0079] Furthermore, multiple power storage devices 2 are housed in the first storage chamber 42. Consequently, multiple gas flow paths 52 are formed within the housing 6, extending from the exhaust ports 36 of each power storage device 2 to the opening 50. The multiple gas flow paths 52 extend toward the common opening 50. Therefore, each gas flow path 52 has a convergent portion 52a where the gas flow paths converge, at least in part. In other words, each gas flow path 52 forms a single flow path in at least a portion of its section.

[0080] In this embodiment, second storage chamber 44 is provided so as to be in contact with the outer wall of housing 6. Furthermore, opening 50 is arranged so as to connect the exterior of housing 6 with the interior space of second storage chamber 44. Therefore, the interior space of second storage chamber 44 communicates with the interior space of first storage chamber 42 via through-hole 48, and communicates with the exterior of housing 6 via opening 50. Thus, the interior space of second storage chamber 44 constitutes a portion of gas flow path 52.

[0081] The fire extinguishing agent sheet 60 is stored in the second storage chamber 44. Therefore, the fire extinguishing agent sheet 60 is arranged in the gas flow path 52. In the second storage chamber 44, the fire extinguishing agent sheet 60 is arranged in a manner that blocks the upstream side of the gas flow path 52 (i.e., the exhaust portion 36 side) and the downstream side of the gas flow path 52 (i.e., the opening portion 50 side). In other words, the fire extinguishing agent sheet 60 is arranged in a manner that one main surface faces the upstream side of the gas flow path 52 and the other main surface faces the downstream side of the gas flow path 52, and the entire peripheral portion is fixed to the housing 6 or the wall portion 46. The through hole 62 extends from one main surface of the fire extinguishing agent sheet 60 to the other main surface. Therefore, the exhaust gas can flow from the exhaust portion 36 side to the opening portion 50 side through the through hole 62. Therefore, the through hole 62 constitutes a part of the gas flow path 52.

[0082] Furthermore, the gas exhausted from the exhaust portion 36 of each power storage device 2 passes through the through hole 48 and into the second storage chamber 44 to reach the opening 50. Therefore, the interior space of the second storage chamber 44 constitutes the converged portion 52a of the gas flow path 52. Therefore, the fire extinguisher tablets 60 in the second storage chamber 44 are arranged in the converged portion 52a.

[0083] like Figure 4 As shown by the middle dashed line, the fire extinguishing agent sheet 60 may be arranged so as to cover the opening 50. In this case, the wall 46 may be omitted. When the wall 46 is omitted, the fire extinguishing agent sheet 60 may be fixed to the peripheral edge of the opening 50 by, for example, bonding.

[0084] In the shell 6, a plurality of fire extinguishing agent sheets 60 may be arranged at a plurality of locations. In addition, a plurality of fire extinguishing agent sheets 60 may be arranged at predetermined intervals. In this case, adjacent fire extinguishing agent sheets 60 may have through holes 62 at different positions from each other. According to the arrangement of such through holes 62, the gas meanders when passing through each fire extinguishing agent sheet 60. Thus, the flow path of the gas can be extended, and the gas can be further cooled during the period until it is discharged to the outside of the shell 6. In addition, when observed from the direction of travel of the gas flowing near the fire extinguishing agent sheet 60 (the direction perpendicular to the main surface of the fire extinguishing agent sheet 60), the entire periphery of the fire extinguishing agent sheet 60 may not abut against the inner wall of the second storage chamber 44.

[0085] As described above, the power storage pack 1 of this embodiment includes: at least one power storage device 2, having an exterior body 16 and an exhaust portion 36 for exhausting gas generated within the exterior body 16; a fire extinguisher tablet 60 composed of a plurality of fire extinguisher powders and having through-holes 62; and a housing 6 that houses the power storage device 2 and the fire extinguisher tablet 60. The fire extinguisher tablet 60 is arranged so that gas exhausted from the power storage device 2 flows through the through-holes 62. This allows the gas exhausted from the power storage device 2 to come into contact with the fire extinguisher powder, and the negative catalytic effect of the fire extinguisher powder can suppress ignition caused by the exhaust gas.

[0086] In conventional structures that eject fire extinguishing agent powder by rupturing a fire extinguishing container, the container takes time to rupture, resulting in a time lag between the discharge of gas and the discharge of the fire extinguishing agent. Consequently, the fire extinguishing action of the fire extinguishing agent powder is delayed, potentially preventing a sufficient fire extinguishing effect. Furthermore, the specific surface area of ​​fire extinguishing agent powder is very large. Therefore, when ejecting fire extinguishing agent powder, each individual particle of fire extinguishing agent reacts rapidly with the exhaust gas. Furthermore, most of the fire extinguishing agent powder is exerted at once. Meanwhile, the discharge of gas from the power storage device 2 typically lasts from several seconds to tens of seconds. Therefore, when ejecting fire extinguishing agent powder, the powder is depleted in the initial stages of gas discharge, potentially preventing a sufficient fire extinguishing effect. Furthermore, when ejecting fire extinguishing agent powder, unreacted powder is compressed by the exhaust gas and dispersed, potentially preventing a sufficient fire extinguishing effect.

[0087] In contrast, in this embodiment, the fire extinguishing agent powder is arranged in the form of a fire extinguishing agent tablet 60 within the housing 6. Therefore, a container for storing the fire extinguishing agent powder is unnecessary. Consequently, the fire extinguishing agent powder can be activated without delay relative to the discharge of gas from the power storage device 2. Furthermore, since the fire extinguishing agent powder reacts with the gas sequentially starting from the surface of the fire extinguishing agent tablet 60, the rate of consumption of the fire extinguishing agent powder can be delayed. Therefore, the fire extinguishing effect of the fire extinguishing agent powder can be sustained for a long period of time. Furthermore, the fire extinguishing agent powder can be prevented from being expelled by the exhaust gas. Therefore, according to this embodiment, a higher fire extinguishing effect can be achieved. Consequently, the reliability of the power storage pack 1 can be improved.

[0088] In a configuration where a dense fire extinguishing agent sheet without through-holes 62 is placed within the exhaust flow path, the flow of exhaust gas is blocked by the fire extinguishing agent sheet, resulting in significant pressure loss. In this case, the internal pressure of the housing increases excessively due to the pressure loss, potentially damaging the housing. Alternatively, the exhaust gas may bypass the fire extinguishing agent sheet without through-holes and be discharged outside the housing, potentially preventing adequate fire extinguishing effectiveness.

[0089] In contrast, in this embodiment, the fire extinguishing agent sheet 60 is formed from fire extinguishing agent powder, and gas is allowed to flow through the through-holes 62 of the fire extinguishing agent sheet 60. This reduces the pressure loss of the exhaust gas when it is discharged outside the housing 6. Therefore, according to this embodiment, damage to the housing 6 can be suppressed, and a higher fire extinguishing effect can be achieved. Consequently, the reliability of the power storage pack 1 can be improved.

[0090] Furthermore, by adjusting the thickness of the fire extinguishing agent sheet 60, the diameter, number, and placement of the through-holes 62, the pressure loss of the exhaust gas passing through the fire extinguishing agent sheet 60, the contact area with the exhaust gas (i.e., the amount of fire extinguishing agent powder interacting with the exhaust gas), and other factors can be flexibly adjusted. This allows for flexible adaptation to the exhaust gas volume and discharge timing, which may vary depending on the type of power storage device 2. Furthermore, the types of fire extinguishing agent powder can be varied between the interior and exterior of the fire extinguishing agent sheet 60, thereby further enhancing the fire extinguishing effect.

[0091] Furthermore, the housing 6 of this embodiment has an opening 50 that opens at least after the gas is exhausted, connecting the inside and outside of the housing 6. A gas flow path 52 is formed within the housing 6, extending from the exhaust portion 36 to the opening 50. Furthermore, a fire extinguishing agent tablet 60 is disposed within the gas flow path 52. This facilitates contact between the gas exhausted from the power storage device 2 and the fire extinguishing agent tablet 60, thereby achieving a higher fire extinguishing effect.

[0092] Furthermore, the power storage pack 1 includes a plurality of power storage devices 2. Therefore, a plurality of gas flow paths 52 are formed within the housing 6, extending from the exhaust portion 36 of each power storage device 2 to the opening 50. Furthermore, the plurality of gas flow paths 52 have a collection portion 52a where they converge. Furthermore, the fire extinguishing agent tablet 60 is disposed within the collection portion 52a. This increases the number of power storage devices 2 that can be extinguished by one fire extinguishing agent tablet 60. Therefore, the number of fire extinguishing agent tablets 60 disposed within the housing 6 can be reduced. Consequently, the size of the power storage pack 1 can be suppressed. Alternatively, the number of power storage devices 2 that can be accommodated within the housing 6 can be increased. Furthermore, the amount of fire extinguishing agent powder used can be reduced.

[0093] Furthermore, when the fire extinguishing agent sheet 60 is arranged so as to cover the opening 50, even if the gas flow path 52 extending from each power storage device 2 does not have the collective portion 52a, the number of power storage devices 2 that can be extinguished by one fire extinguishing agent sheet 60 can be increased. Therefore, the number of fire extinguishing agent sheets 60 arranged in the housing 6 can be reduced. Furthermore, the degree of freedom in the arrangement of the power storage devices 2 can be increased.

[0094] (Implementation 4)

[0095] Embodiment 4 has the same configuration as Embodiment 3 except for the arrangement of the fire extinguishing agent sheet 60. Hereinafter, this embodiment will be described focusing on the configurations different from Embodiment 3, and the common configurations will be briefly described or omitted. Figure 7 It is a cross-sectional view schematically showing power storage pack 1 according to the fourth embodiment. Figure 7 The internal structure of the power storage device 2 is omitted in the figure.

[0096] The energy storage pack 1 includes multiple energy storage devices 2, a fire extinguisher tablet 60, and a housing 6. The multiple energy storage devices 2 are arranged in a predetermined position within the housing 6. In this embodiment, the multiple energy storage devices 2 are arranged in a matrix of three rows and two columns in the first direction X and the second direction Y. Furthermore, the energy storage devices 2 in the first column and the energy storage devices 2 in the second column are arranged with their positive terminals 2a facing each other. In other words, each energy storage device 2 is positioned in the first direction X with its positive terminal 2a facing the center of the housing 6.

[0097] The housing 6 has a space in the center portion in the first direction X, which is sandwiched between the group of energy storage devices 2 in the first row and the group of energy storage devices 2 in the second row. This space communicates with the exhaust portion 36 of each energy storage device 2. Therefore, gas generated within each energy storage device 2 is discharged from the exhaust portion 36 into this space. Consequently, this space constitutes a shared exhaust region 54 for exhausting gas from each energy storage device 2. The shared exhaust region 54 is, for example, a region defined by the surface on the positive electrode terminal 2a side of the plurality of energy storage devices 2 and two wall surfaces of the housing 6 that face each other in directions perpendicular to the first direction X and the second direction Y.

[0098] A fire extinguishing agent sheet 60, composed of a plurality of extinguishing agent powder aggregates, is arranged in the shared exhaust region 54. For example, the fire extinguishing agent sheet 60 is arranged with one main surface facing the group side of the first row of power storage devices 2 and the other main surface facing the group side of the second row of power storage devices 2. The fire extinguishing agent sheet 60 is fixed to the shared exhaust region 54 by, for example, bonding to the wall surface of the housing 6. By arranging the fire extinguishing agent sheet 60 in the shared exhaust region 54, the gas exhausted from each power storage device 2 can flow through the through-holes 62 of the fire extinguishing agent sheet 60. The arrangement of the fire extinguishing agent sheet 60 in the shared exhaust region 54 can also be considered as the arrangement of the fire extinguishing agent sheet 60 in the gas flow path 52 for the gas exhausted from each power storage device 2.

[0099] This configuration also achieves the same effects as in Embodiment 3. Furthermore, as in Embodiment 3, only one power storage device 2 may be provided in this embodiment. In this case, by arranging the fire extinguishing agent sheet 60 so as to face the exhaust portion 36 of the power storage device 2, the gas exhausted from the power storage device 2 can be easily flowed into the through-hole 62 of the fire extinguishing agent sheet 60.

[0100] Above, embodiments 3 and 4 of the present disclosure are described in detail. The above embodiments are merely embodiments showing specific examples of implementing the present disclosure. The contents of the embodiments do not limit the technical scope of the present disclosure, and various design changes such as changes, additions, and deletions of constituent elements can be made without departing from the scope of the idea of ​​the invention specified in the claims. The new embodiment with the design changes has the effects of the combined embodiment and the deformation. In the above embodiments, for such contents that can be subjected to design changes, expressions such as "in this embodiment" and "in this embodiment" are marked to emphasize, but design changes are also allowed in contents without such expressions. In addition, any combination of the constituent elements included in each embodiment is also valid as a mode of the present disclosure. The hatching of the cross section marked in the accompanying drawings does not limit the material of the object marked with the hatching.

[0101] The number and shape of the fire extinguishing agent sheets 60 disposed in the housing 6 or the openings 50 of the housing 6 are not particularly limited. The outer shape of the power storage device 2 or the housing 6, the internal structure of the power storage device 2, etc. are also not particularly limited.

[0102] [Industrial Applicability]

[0103] The present disclosure can be used in a power storage pack.

[0104] [Explanation of Reference Numerals]

[0105] 1: Power storage pack, 2: Power storage device, 4: Porous portion, 6: Case, 16: External body, 36: Exhaust portion, 38: Fire extinguishing agent particles, 40: Gap, 50: Opening, 52: Gas flow path, 52a: Collecting portion, 54: Common exhaust region, 60: Fire extinguishing agent sheet, 62: Through hole.

Claims

1. A power storage pack, comprising: at least one power storage device including an outer casing and a vent for discharging gas generated inside the outer casing, The porous portion has a structure formed by a plurality of fire extinguishing agent particles being gathered together, and has a void therein, wherein the void is a space divided by the gathered plurality of fire extinguishing agent particles, and a housing that houses the power storage device and the porous portion; Each fire extinguishing agent particle is an aggregate of multiple fire extinguishing agent powders; The porous portion is arranged so that the gas flows in the gaps.

2. The power storage pack according to claim 1, wherein: The housing has an opening that opens at least after the gas is exhausted to connect the inside and outside of the housing, and a gas flow path from the exhaust portion to the opening is formed in the housing; The porous portion is disposed in the gas flow path.

3. The power storage pack according to claim 2, wherein: The power storage pack includes a plurality of the power storage devices; A plurality of gas flow paths from the exhaust portion of each power storage device to the opening are formed in the housing; The plurality of gas flow paths have a collection portion where the gas flow paths are collected together; The porous portion is disposed in the aggregate portion.

4. The power storage pack according to claim 2 or 3, wherein: The porous portion is arranged so as to cover the opening.

5. The power storage pack according to claim 1, wherein: The power storage pack includes a plurality of the power storage devices; The housing has a common exhaust region to which the exhaust portions of the power storage devices communicate; The porous portion is disposed in the common exhaust region.

6. A power storage pack comprising: at least one power storage device including an outer casing and a vent for discharging gas generated inside the outer casing, A fire extinguishing agent sheet, which is composed of a plurality of fire extinguishing agent powder aggregates and has a through hole penetrating the sheet in the thickness direction, and a housing for housing the power storage device and the fire extinguishing agent tablet; The fire extinguishing agent sheet is arranged so that the gas flows through the through hole.

7. The power storage pack according to claim 6, wherein: The housing has an opening that opens at least after the gas is exhausted to connect the inside and outside of the housing, and a gas flow path from the exhaust portion to the opening is formed in the housing; The fire extinguishing agent sheet is arranged in the gas flow path.

8. The power storage pack according to claim 7, wherein: The power storage pack includes a plurality of the power storage devices; A plurality of gas flow paths from the exhaust portion of each power storage device to the opening are formed in the housing; The plurality of gas flow paths have a collection portion where the gas flow paths are collected together; The fire extinguishing agent sheet is arranged in the collecting portion.

9. The power storage pack according to claim 7 or 8, wherein: The fire extinguishing agent sheet is arranged so as to cover the opening.

10. The power storage pack according to claim 6, wherein: The power storage pack includes a plurality of the power storage devices; The housing has a common exhaust region to which the exhaust portions of the power storage devices communicate; The fire extinguishing agent sheet is arranged in the common exhaust area.

Images