JP2014090782A - Electric power storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fire of a sodium-sulfur battery occurring in a module battery container from escalating into a chan reaction by reliably extinguishing the fire.SOLUTION: The electric power storage system comprises a plurality of module batteries 18 each of which is formed by storing a plurality of sodium-sulfur batteries 30 in an insulating container constituted of an insulation box 24 and an insulation lid 26, and stores the electric power in the module batteries 18 to be used. A smoking-fire extinguishing device 40 comprises: a device body 42 disposed on an outer lateral face of the insulation lid 26 of the module batteries 18; and a jet head installed therefrom via a jet tube 44 and an elbow 45 into the insulation container. When detecting a fire due to abnormality of the sodium-sulfur batteries 30, the smoking-fire extinguishing device ignites and burns a solid extinguishant in the device body 42 to generate fire-extinguishing aerosol, jets out the fire-extinguishing aerosol to the inside of the insulating container of the module batteries 18 to extinguish or suppress the fire.

Description

The present invention relates to an electric power storage system used for storing electric power in a sodium / sulfur battery to equalize electric power demand.

  Conventionally, power storage systems using sodium-sulfur batteries (also referred to as “NAS batteries”) are systems for leveling power demand that has a large disparity between day and night, for example, during the summer when power demand increases rapidly. As a so-called peak-cut power storage system that supplies power, or as an emergency power supply system in the event of a natural disaster, it has been put into practical use for various other uses and has begun to spread.

  A sodium / sulfur battery has a molten metal sodium, which is a cathode active material, on one side and a molten sulfur, which is an anode active material, on the other side.・ High temperature secondary battery isolated with alumina solid electrolyte and operated at about 300 ℃, energy density is higher than other batteries, equipment is more compact, and there is almost no self-discharge. Furthermore, it has excellent characteristics such as easy maintenance.

  In addition, the power storage system is configured by connecting sodium / sulfur batteries in series in units of a predetermined number to form one string, connecting a predetermined number of strings in parallel to form a module battery, and further packaging a predetermined number of module batteries. It is arranged inside and connected in series and parallel to constitute a system.

  The module battery is composed of a heat insulation box and a heat insulation lid, and a heat insulation container is provided. A heater panel is provided in the heat insulation box, and a plurality of cylindrical sodium / sulfur batteries are arranged side by side in the space between the plurality of sodium / sulfur batteries. Filled with dry sand.

  With the widespread use of such power storage systems using sodium / sulfur batteries, fires due to abnormalities in sodium / sulfur batteries housed in module batteries have been reported.

  In this fire, one of the sodium / sulfur batteries that make up the module battery has a manufacturing defect. When this sodium / sulfur battery broke open, high temperature active material (melt) leaked and other sodium A short circuit is caused with the sulfur battery, and a circulating current exceeding 1000 amperes continuously flows and the temperature rises. Along with this, many sodium-sulfur batteries are broken open in the module battery, and a flame of about 2000 degrees Causes an open break in the module battery placed at the top, spreads and spreads, similarly, a large amount of high temperature active material flows into the module battery placed at the bottom, similarly dissolves the sodium-sulfur battery, It is an enlarged fire.

  In response to this fire, the fire brigade fire extinguished with dry sand, but it takes 8 hours to subside and 15 days to extinguish.

  Recently, a third-party evaluation of the fire revealed the cause of the fire and the cause of the spread of fire, and the Fire Department issued a notice regarding the fire countermeasures at general handling stations where sodium and sulfur batteries are installed. As future countermeasures, the addition of a fuse between single cells in a module battery, the addition of a short-circuit prevention plate separating the single cells in the module battery, and the addition of a fire spread prevention plate between module batteries are shown.

JP-A-2005-149977 JP 2008-226488 A Director of the Fire Safety Agency's Dangerous Goods Safety Office, “Fire Countermeasures at General Handling Offices with Sodium / Sulfur Batteries”, June 7, 2012, [Search September 20, 2012], Internet <URL: http: // / Www. fdma. go. jp / concern / law / tuchi2406 /. . . / 240607-ki154. pdf>

  In such a power storage system using a conventional sodium / sulfur battery, when a fire occurs from one sodium / sulfur battery housed in a module battery, it is filled between the sodium / sulfur batteries. The dry sand prevents the leaked high-temperature active material from flowing to the surroundings, and adsorbs and inactivates the active material, suppresses chain breakage of adjacent batteries and self-extinguishes (self-extinguishing). As expected, if self-extinguishing is not possible, a high-temperature reaction will occur due to leaked sodium and sulfur, which may cause the module battery container to melt and spread to the adjacent module battery, Even if a fire breaks out, it is strongly desired not to expand the chain by positively extinguishing the fire in the module battery container.

An object of the present invention is to provide a power storage system that can reliably extinguish a fire of a sodium / sulfur battery generated in a container of a module battery and prevent chain expansion.

(Power storage system)
The present invention is a power storage system comprising a plurality of module batteries each containing a plurality of sodium / sulfur batteries in a container, and storing and using electric power in the module batteries.
The module battery container is provided with a smoke-extinguishing device that injects a fire-extinguishing aerosol into the container to extinguish the fire when a sodium-sulfur battery fire is detected.

(The smoke-extinguishing device is placed outside the heat insulating lid)
The module battery container consists of a heat insulating box with a heat insulating structure and a heat insulating lid,
The smoke-extinguishing device is composed of a device main body and a jet pipe, the device main body is arranged outside the heat insulating lid, and the other end of the jet pipe having one end connected to the device main body is introduced into the container through the heat insulating lid. And open the spout.

(Closing the jet pipe outlet)
The ejection pipe of the smoke-extinguishing apparatus is provided with a closing plate that breaks and opens by the spray output of the fire-extinguishing aerosol at the ejection port located in the container.

(Structure of smoke-extinguishing device)
The main body of the smoke-extinguishing device is
A housing fixed to the outside of the heat insulating lid and provided with a spout pipe connection port;
A solid fire extinguisher housed in a housing and generating a fire extinguishing aerosol by combustion;
A temperature detection unit that detects the temperature in the container by a temperature detection element that is connected to the signal line drawn from the housing through the ejection pipe and disposed in the container;
An ignition circuit unit for igniting and burning a solid fire extinguisher by energizing overheating of the heater when the temperature detected by the temperature detection unit is equal to or higher than a predetermined temperature due to a fire of the sodium / sulfur battery;
A battery power supply for supplying power to the ignition circuit;
Is provided.

(Distributed arrangement of multiple temperature detection elements)
The temperature detection unit disperses and arranges a plurality of temperature detection elements in the container, and connects to each of a plurality of signal lines drawn from the housing through the ejection pipe into the container.
The ignition circuit unit ignites and burns the solid fire extinguisher by energizing overheating of the heater when the temperature detected by at least one of the plurality of temperature detecting elements is equal to or higher than a predetermined temperature due to a fire of the sodium / sulfur battery.

  The temperature detection element is a thermocouple that generates an electromotive force according to the temperature in the container.

  The ignition circuit unit outputs a fire extinguishing start signal to the outside when the solid fire extinguisher is ignited and burned by energization heating of the heater.

(Thermal sensing cable)
The temperature detector is a heat-sensing cable that contacts a pair of signal wires in a short-circuited state by melting the insulation coating when receiving heat from a fire.
When the short circuit of the heat sensing cable is detected, the ignition circuit unit ignites and burns the solid fire extinguisher by energization heating of the heater.

(External input of ignition signal)
When an ignition signal is input from the outside, the ignition circuit unit ignites and burns the solid fire extinguisher by energization overheating of the heater.

(Housing structure of smoke-extinguishing device)
The smoke-extinguishing device housing is
A fire extinguisher storage case that is placed in a floating state inside the housing via a support member and stores a solid fire extinguisher,
A flue structure that forms a flue that guides the fire-extinguishing aerosol spouted from the extinguishing agent storage case to the spout, and
A flame ejection preventing member disposed in the flue;
Is provided.

(Basic effect)
The power storage system of the present invention has a smoke-extinguishing device arranged in a container of a high-temperature operation type module battery containing a plurality of sodium-sulfur batteries, and detects a fire accompanying abnormality of the sodium-sulfur battery. Fire extinguishing aerosol was sprayed from the equipment into the container to extinguish the fire, so sodium and sulfur batteries were damaged by beta and alumina solid electrolyte tubes due to various causes such as manufacturing failure, internal short circuit, and overcharge. Will cause a high-temperature reaction due to contact with the battery, resulting in a significant rise in battery temperature. As a result, the sodium-sulfur battery will burst open or ignite, and if the active materials sodium and sulfur leak out, this fire will be detected. Fire extinguishing aerosol is blown into the container from the smoke-extinguishing device, and fire extinguishing is suppressed in the module battery container. To prevent leakage of the chain, also makes it possible to prevent that would expand to a large fire to spread to other modules battery module battery as the fire origin.

  In addition, the fire extinguishing aerosol that spouts into the module battery container containing the sodium / sulfur battery is generated by igniting and burning the solid fire extinguisher, and the fire extinguishing aerosol is a fine particle of about 2 μm. The main component contains, for example, metal oxides, carbonates, phosphates or mixtures thereof. Specific examples include potassium chloride, sodium chloride, sodium carbonate, sodium sulfate, etc., which contain nitrogen, carbon dioxide, water vapor, etc., and are suitable for electric fires that cannot use water-based fire extinguishing agents. Can do.

  In addition, the inside of the module battery container is a sealed space that is shielded from the outside air, so that the fire extinguishing aerosol ejected from the smoke-extinguishing device reliably stays in the container and hardly leaks to the outside. It is possible to reliably suppress a fire in the module battery container caused by the abnormality.

(Effect by placing the smoke-extinguishing device outside the heat insulating lid)
The sodium / sulfur battery uses molten sodium and molten sulfur as active materials for the negative electrode and the positive electrode, respectively, and uses beta / alumina, which is a sodium ion conductive ceramic, as the electrolyte, and operates at about 300 ° C., The container of the module battery is composed of a heat insulating container including a heat insulating box having a heat insulating structure (vacuum heat insulating structure) and a heat insulating lid. For this reason, when providing the module battery with a smoke-extinguishing device, it is important to have an arrangement and structure that is not affected by the high-temperature atmosphere in the heat insulating container of the module battery.

  Therefore, the smoke-extinguishing device is composed of a device main body and a jet pipe, and the device main body is arranged at a position away from the outside of the heat insulating lid of the module battery with a surface temperature of about 60 ° C. via the jet pipe. The other end of the ejection pipe connected to one end of the apparatus body is introduced into the container through the heat insulating lid, and the ejection opening is opened. Therefore, even if the temperature in the container is as high as about 300 ° C., the opening is opened inside. By disposing the device main body outside the heat insulating lid as far as possible from the spout, the heat transmitted from the heat insulating container to the device main body of the smoke-extinguishing device through the spout tube is cooled by exposing the spout tube to the outside air. The temperature is lowered by heat dissipation due to this, and the influence of the high temperature atmosphere in the module battery container can be reduced as much as possible.

(Effect of closing the outlet of the ejection pipe)
The ejection pipe of the smoke-extinguishing device prevents the high temperature atmosphere in the container from entering the ejection pipe by providing a sealing plate that breaks and opens with the ejection power of the fire-extinguishing aerosol at the ejection port located in the container. The influence of the high-temperature atmosphere in the module battery container is suppressed, and the temperature of the smoke-extinguishing device can be reduced as much as possible.

(Effects of smoke-extinguishing device structure)
The smoke-extinguishing device is a device composed of a housing, a solid fire extinguishing agent, a temperature detection unit, and an ignition circuit unit. Compared with a water-based fire extinguishing means, it can be made compact and lightweight, for example, about the size of a book. -Even if it is externally attached to the module battery container containing the sulfur battery, the installation space of the container is not greatly affected.

  Moreover, it is known that the weight of the solid fire extinguishing agent for obtaining the fire extinguishing aerosol necessary for fire extinguishing is, for example, about 80 to 200 grams per cubic meter. The available volume is, for example, about 0.5 cubic meters, and the solid fire extinguisher necessary for this is about 40 grams to 100 grams. Since the necessary solid fire extinguisher is small, the smoke-extinguishing device is a compact book size. It is possible to make it a different size.

  In addition, since the amount of solid fire extinguisher required is small, even if the fire extinguishing aerosol is generated by burning the solid fire extinguisher, the flame and heat generated by the burning of the solid fire extinguisher can be reduced. There will be no problems that cause a fire caused by a sulfur battery.

(Distributed arrangement of multiple temperature detection elements)
Since the temperature detection unit distributes a plurality of temperature detection elements in the container and connects to each of the plurality of signal lines drawn from the housing through the ejection pipe and into the container, the signal line is connected to, for example, a heat insulating lid of the module battery. It is no longer necessary to connect the temperature detection element penetrating inside the container and the apparatus main body outside the container, and the signal line connection between the temperature detection element arranged inside the container and the apparatus main body arranged outside is easy. it can.

(Effect of external output of fire extinguishing start signal)
The ignition circuit unit of the smoke-extinguishing device outputs a fire extinguishing start signal to the outside when the solid fire extinguisher is ignited and burned by energization heating of the heater. The fire extinguishing start can be displayed and notified.

(Effect by external input of ignition signal)
The ignition circuit part of the smoke generator, when an ignition signal is input from the outside, ignites the solid fire extinguisher and burns it by overheating the heater, so automatic fire extinguishing based on module battery fire detection by the temperature detection part In addition, for example, when a monitoring center operator notices a module battery high-temperature abnormality from the module temperature abnormality alarm, the smoke-extinguishing device is remotely activated based on the manual operation of the monitoring center device, and the fire-fighting aerosol is applied. It is possible to suppress and extinguish a fire by jetting into a container.

Explanatory diagram showing the power storage system of the present invention installed outdoors Perspective view of module battery partially broken and shown with internal structure Front view of the module battery partially broken and shown with the internal structure Top view of module battery Plan view showing the insulation lid of the module battery from the inside Side sectional view of the part where the module battery smoke extinguishing device is placed Sectional drawing which showed embodiment of the smoke-extinguishing device Explanatory drawing showing the inside of the housing with the lid of the smoke-extinguishing device removed Sectional view showing the mounting structure of the ejection pipe to the heat insulating lid Explanatory drawing which showed the sealing board provided in the jet outlet of the jet head The circuit diagram which showed embodiment of the ignition circuit part provided in the smoke-extinguishing device Explanatory drawing which showed fire extinguishing operation which starts smoke generation fire extinguishing device and spouts fire extinguishing aerosol in container Explanatory drawing showing a module battery with two smoke-extinguishing devices installed FIG. 13 is a sectional view of the module battery shown in FIG. Plan view of the module battery of FIG. The perspective view which showed the module battery using the heat insulation cover with the structure which can attach or detach a heat insulation plate detachably The perspective view which showed the state which has arrange | positioned the heat insulation plate to the heat insulation lid | cover of FIG.

[Outline of power storage system]
FIG. 1 is an explanatory view showing an external appearance of a power storage system according to the present invention installed outdoors. As shown in FIG. 1, the power storage system 10 installed outdoors includes, for example, four packages 12 arranged side by side. The package 12 includes a double door 14 at the front, and the interior of the door 14 is The platform 16 is vertically divided into, for example, five stages, and each of the platforms 16 houses a module battery 18 in which a large number of sodium / sulfur batteries are stored. The power storage system 10 as a whole has a total of 20 in this embodiment. The module battery 18 is accommodated. The number of module batteries 18 housed in the power storage system 10 is an appropriate number corresponding to the required output and capacity.

  The door 14 of the package 12 is provided with an intake gallery 20 corresponding to the position of the module battery 18 mounted on the mount 16, and an exhaust port 22 having a roof structure is provided above the package 12. Thus, during the high temperature operation of the module battery 18, natural ventilation is performed so that the air sucked from the intake gallery 20 passes through the module battery 18 and is discharged from the upper exhaust port 22, and the module battery 18 is operating at a high temperature. Heat released from the module battery 18 is released to the outside, and heat dissipation characteristics are ensured so that the temperature of the sodium / sulfur battery stored in the module battery 18 can be controlled in the range of about 280 ° C. to about 36 ° C.

[Outline of module battery]
2 is a perspective view of the module battery partially broken and shown with the internal structure, FIG. 3 is a front view of the module battery partially broken and shown with the internal structure, FIG. 4 is a plan view of the module battery, and FIG. The top view which showed the heat insulation cover of the module battery from the inside, and FIG. 6 are side sectional drawings of the part which has arrange | positioned the smoke-extinguishing apparatus of a module battery.

  As shown in FIGS. 2 to 6, the module battery 18 is a high-temperature operation type battery in which the sodium / sulfur battery 30 is operated at about 300 ° C., and thus functions as a temperature increase and heat retention mechanism. The module battery 18 is a heat insulating container composed of a heat insulating box 24 opened at the top and a heat insulating lid 26 hermetically mounted on the opening of the heat insulating box 24. The heat insulating structure of the heat insulating box 24 and the heat insulating cover 26 is a vacuum heat insulating structure. . As the material of the heat insulation box 24 and the heat insulation lid 26, for example, stainless steel having a low thermal conductivity is used.

  Inside the heat insulation box 24, the heater panel 28 is arranged on the side surface and the bottom surface, the partition plate 25 is arranged on the heater panel 28 on the bottom surface, and a large number of sodium / sulfur batteries 30 are arranged side by side on the partition plate 25. The gap between the sodium / sulfur batteries 30 is filled with dry sand 32 such as silica sand.

  The sodium / sulfur battery 30 has a cylindrical shape, and has a bottomed bag-like beta-alumina solid electrolyte tube having sodium ion conductivity, molten sodium as a negative active substance, and molten sulfur as a positive electrode active substance. The negative electrode terminal is taken out from the upper outer side, and the positive electrode terminal is taken out from the upper inner side.

  The sodium / sulfur battery 30 housed in the module battery 18 operates at about 300 ° C. by the temperature rise and heat retention by the heater panel 28. Specifically, since the temperature decreases when the sodium / sulfur battery 30 is charged, the operation is performed so as not to fall below 290 ° C., for example. On the other hand, when the sodium / sulfur battery 30 is discharged, the temperature rises due to Joule heat or thermodynamic reaction heat due to the resistance component, so that the operation is performed so as not to exceed the allowable operating temperature of 360 ° C. at which the battery function is lost. The sodium / sulfur battery 30 is provided with a fuse for protecting the battery from overcurrent.

  The dry sand 32 keeps the temperature inside the module uniform, imparts heat capacity, and has a function (self-extinguishing property) as a self-extinguishing agent in an emergency. Here, the self-extinguishing property of dry sand means that the high-temperature active material leaked due to the open destruction of the sodium / sulfur battery is prevented from flowing and spreading to the surroundings, and the active material is adsorbed and inactivated, so that Fire extinguishing while suppressing chain breakage.

  Further, the module battery 18 serves as a barrier for preventing the active material leaked due to the abnormality of the sodium / sulfur battery 30 from leaking to the outside, and influences various obstacles generated from the outside on the sodium / sulfur battery 30. It plays a role in reducing and ensuring safety.

  In the safety of the module battery 18, the heat insulating container performs an important function. Since the heat insulation box 24 and the inner plate of the heat insulation lid 26 constituting the heat insulation container maintain liquid tightness by welding or the like, the high temperature active material leaked by the open destruction of the sodium / sulfur battery 30 is retained in the module battery 18. it can. In addition, it acts as a barrier against troubles such as external fire, water damage, drop impact, etc., mitigating the influence on the inside and protecting the sodium / sulfur battery 30.

  Further, the dry sand 32 filled between the sodium / sulfur batteries 30 limits the amount of oxygen in the module battery 18, and therefore, the oxidation reaction of the high-temperature active material leaked due to the open destruction of the sodium / sulfur battery 30. Since the reaction is limited and the heat of reaction is also restricted, it is possible to prevent the leakage of the active material of the sodium / sulfur battery 30 from extending to another adjacent sodium / sulfur battery 30.

  The module battery 18 has a size of about a double bed, for example, a width of about 2.2 meters, a depth of about 1.8 meters, and a height of about 0.7 meters. The sodium / sulfur battery 30 has a diameter of about 9 cm, for example. For example, 320 sodium / sulfur batteries 30 are arranged and housed in the heat insulation box 24 of the module battery 18.

  The sodium / sulfur battery 30 housed in the module battery 18 is formed by connecting five strings of eight sodium / sulfur batteries 30 connected in series to form one block, and 320 forming eight blocks in series. doing. The sodium-sulfur battery 30 has an output of about 2 volts and 80 amperes. Specifically, it is about 2.19 volts during charging and about 1.94 volts during discharging. Therefore, the voltage of the module battery 18 is about 140 volts during charging, about 124 volts during discharging, and the output is about 50 kW.

  In addition, since the power storage system 10 shown in FIG. 1 has five module batteries housed in the mount 16 of the package 12 connected in series, the voltage in this case is about 700 volts during charging, Is about 620 volts and the output is about 250 kW. Further, in FIG. 1, since the four packages 12 are connected in parallel, the output is about 1000 kW.

  In addition, as a safety measure based on the investigation of the cause of the fire that occurred in the past, the sodium-sulfur battery 30 has a sodium-sodium-sulfur battery 30 in the module battery 18 so that the high-temperature active material does not cross between the blocks. A short-circuit prevention plate (steel plate) separating the sulfur battery 30 is provided. Further, as shown in FIG. 1, for each of the module batteries 18 housed in the multi-stage pedestal 16, in order to prevent the spread of fire spread to adjacent modules, the fire spread prevention plate between the upper and lower sides (steel plate) and the side fire spread prevention plate (steel plate). Is provided.

[Outline of Smoke Extinguishing Equipment]
As shown in FIGS. 2 to 6, the module battery 18 has various safety measures including the self-extinguishing property of the dry sand described above. In addition to this, in this embodiment, the heat insulation of the module battery 18 is performed. A smoke-extinguishing device 40 is provided in order to actively suppress and suppress a fire caused by an abnormality of the sodium / sulfur battery in the container.

  When a fire due to an abnormality of the sodium / sulfur battery 30 housed in the module battery 18 is detected, the smoke-extinguishing / extinguishing device 40 jets out a fire-extinguishing aerosol into the heat insulating container of the module battery 18 to suppress the fire and dry sand. Combined with the self-extinguishing property due to the filling of 32, it is possible to more reliably suppress the fire of the sodium / sulfur battery 30 in which an abnormality has occurred and further suppress the spread of fire spread.

  Further, when the module battery 18 is provided with the smoke-extinguishing device 40, the smoke-extinguishing device 40 is disposed at a position not affected by the high-temperature atmosphere in the heat-insulating container of the module battery 18 operating at about 300 ° C., and sufficient insulation is provided. It is important to adopt a structure for heat dissipation.

  The smoke-extinguishing device 40 includes a device main body 42 and a jet pipe 44, and the device main body 42 is less affected by the high temperature atmosphere in the heat insulating container, for example, on the outer surface of the heat insulating lid 26, and the upper portion protrudes from the upper surface of the heat insulating lid 26. To place.

  The fire-extinguishing aerosol generated in the apparatus main body 42 must be ejected from the approximate center of the upper surface of the module battery 18 into the heat insulating container so that it can be diffused and filled in the empty space. 45, the ejection head 50 which penetrates the heat insulation lid 26 under the elbow 45, and which has a tip in the heat insulation container is mounted, and the outlet of the ejection head 50 is opened in the heat insulation container. The ejection pipe 44, the elbow 45, and the ejection head 50 correspond to the ejection pipe in the claims.

  As will be described later, a sealing plate is provided at the tip opening of the jet head 50 to be broken and opened by the jet power of the fire-extinguishing aerosol. The inside of the jet pipe 44 is separated from the inside of the heat insulating container of the module battery 18, and about The hot air in the heat insulating container operating at 300 ° C. is prevented from entering the ejection pipe 44.

  The apparatus main body 42 arranged at a remote position on the outer side surface of the heat insulating lid 26 and the elbow 45 fitted with the ejection head 50 at the center of the upper surface of the heat insulating lid 26 are connected by an ejection pipe 44. By connecting the apparatus main body 42 and the elbow 45 with the connecting pipe 44 floating from the upper surface of the heat insulating lid 26, a heat insulating structure that does not directly receive the heat of the heat insulating lid 26 is obtained, and exposure to the outside air is sufficient. Cooling is possible. As the connecting pipe 44, a thin steel pipe or aluminum pipe having a high thermal conductivity is used.

  Inside the heat insulating lid 26 of the module battery 18, for example, a sheath thermocouple 46 that functions as a temperature detection unit is arranged in four places. Four signal lines 48 drawn from the apparatus main body 42 are drawn into the sheath thermocouple 46 through the inside of the ejection pipe 44, elbow 45 and ejection head 50 and connected to the inside of the heat insulating lid 26. Thus, the signal line 48 connected to the sheath thermocouple 46 is introduced into the heat insulating container through the ejection pipe 44, the elbow 45, and the ejection head 50, so that a structure for passing the signal line through the heat insulating lid 26 is required. The structure of the heat insulating lid 26 can be simplified.

[Details of smoke-extinguishing equipment]
FIG. 7 is a cross-sectional view showing an embodiment of the smoke-extinguishing device, and FIG. 8 is an explanatory diagram showing the inside of the housing with the lid of the smoke-extinguishing device removed.

(The main body of the smoke-extinguishing device)
As shown in FIGS. 7 and 8, a device main body 42 of the fuming and extinguishing device 40 is attached to the outer surface of the heat insulating lid 26 in the module battery 18. The smoke-extinguishing device 40 includes a flat box-shaped housing 54 opened at one end in the longitudinal direction and a lid member 56 attached to the opening of the housing 54, and the lid member 56 is hermetically attached to the opening of the housing 54. And are fixed by screws 57.

  A jet pipe connection port 58 is fixed to the surface of the housing 54 attached to the outer surface of the heat insulating lid so as to protrude to the outside. One end of the jet pipe 44 is inserted and fixed here, and a fire extinguishing aerosol is injected into the jet connection port 58. Can be ejected to the ejection pipe 44.

  Further, as shown in FIG. 8, mounting ribs 82 having through holes are fixed by welding or the like at four locations on the mounting surface of the housing 54 on the outer surface of the heat insulating lid. The housing 54 is supported and fixed in a floating state with respect to the outer side surface, and a heat insulating structure for minimizing heat transfer from the heat insulating lid 26 is provided.

  A fire extinguishing agent storage case 60 in which a solid fire extinguishing agent 62 is stored is incorporated in the apparatus main body 54. The fire extinguishing agent storage case 60 is a box-shaped case member that opens rearward (lower in the figure) when the direction in which the ejection pipe connection port 58 of the casing 54 is provided is the front (upward in the figure). The fire extinguisher storage case 60 is positioned and supported so that the figure-shaped support piece 64 is fixed by welding or the like, and the lid member 56 is fixed to the housing 54 so as to float inside the apparatus main body 42.

  In addition, with respect to the rear of the fire extinguishing agent storage case 60 (downward in the figure), a pair of support pieces 66 bent in the lateral direction and a pair of support pieces whose side surfaces extend rearward (downward in the figure) and whose tips are bent in an L shape. The fire extinguisher storage case 60 is positioned and supported so as to be in a floating state inside the apparatus main body 42 by attaching and fixing the lid member 56 to the housing 54.

  The support structure of the extinguishing agent storage case 60 minimizes contact with the casing 54 and the lid member 56, and forms an air layer in which heat due to combustion of the solid extinguishing agent 62 is not easily transmitted to the outer casing 54 and the lid member 56. Interstitial heat insulation structure.

  Here, the casing 54, the lid member 56, the extinguishing agent storage case 60, the support pieces 64, 65, 66, and the mounting rib 82 generate a fire extinguishing aerosol by the combustion of the solid extinguishing agent 62. Made of a metal material to withstand the heat generated by combustion of 62.

  A solid fire extinguishing agent 62 is accommodated in the extinguishing agent storage case 60, and a heater 70 is embedded and fixed in the solid extinguishing agent 62.

  An ignition circuit unit 68 is provided inside the apparatus main body 42. The cable 52 is connected to the ignition circuit unit 68 through the plug 74 from the connector 72 side. The cable 52 includes a power line, a signal line for inputting an ignition control signal, and a signal line for outputting a fire extinguishing start signal. Further, four signal lines 48 are drawn out from the ignition circuit section 68, pass through the ejection pipe connection port 58, the ejection pipe 44, the elbow 45, and the ejection head 50, and as shown in FIG. The sheathed thermocouple 46 is connected thereto.

  The ignition circuit unit 68 ignites and burns the solid extinguisher 62 by energizing and heating the heater 70 when a fire associated with an abnormality of the sodium / sulfur battery is determined from the temperature detected by the sheath thermocouple 48. The fire-extinguishing aerosol is generated by this combustion, and the fire-extinguishing aerosol is ejected from the ejection head 50 into the heat insulating container of the module battery 18 through the ejection pipe connection port 58, the ejection pipe 44 and the elbow 45.

  The fire-extinguishing aerosol generated by the combustion of the solid fire extinguishing agent 62 is an ultrafine particle of about 2 μm, and its main component contains a metal oxide, carbonate, phosphate, a mixture thereof, or the like.

  As a specific example, potassium chloride, sodium chloride, sodium carbonate, sodium sulfate and the like are the main components, and nitrogen, carbon dioxide, water vapor and the like are contained therein. In the fire extinguishing aerosol having such a main component, the fire extinguishing aerosol itself is not toxic and can be said to be an environmentally friendly generated gas. In addition, the component of the solid fire extinguisher 62 is not limited to the above, but can be a solid fire extinguisher containing an appropriate component effective for suppressing fire extinguishing of a sodium / sulfur battery fire.

  The fire extinguishing action by the fire-extinguishing aerosol generated by the combustion of the solid fire extinguishing agent 62 is to fill the inside of the container of the module battery 18 with the fire-extinguishing aerosol, so that the active center of the active material that has leaked due to the abnormality of the sodium / sulfur battery is active. Extinguishing and suppressing fire extinguishes, and a fire extinguishing action suitable for an electric fire that cannot use an aqueous fire extinguishing agent is obtained.

  The amount of the solid fire extinguishing agent 62 is determined according to the free space in the heat insulating container of the module 18. The weight of the solid fire extinguishing agent 62 for generating a fire extinguishing aerosol necessary for extinguishing per cubic meter of fire extinguishing target area to be a closed space is about 80 g to 200 g, and based on this, a module to be extinguished An amount of solid fire extinguisher 62 corresponding to the free space in the heat insulating container of the battery 18 is stored in the fire extinguisher storage case 36.

  The internal volume of the module battery 18 to be extinguished by the smoke-extinguishing apparatus 40 of the present embodiment is, for example, about 2.5 cubic meters. A large number of sodium / sulfur batteries 30 are accommodated in the container, and the dry sand 32 is interposed therebetween. Therefore, for example, when the empty volume in the heat insulating container of the module battery 18 is 0.5%, which is 20%, the weight of the solid fire extinguisher necessary for this empty volume is 40 grams to 100 grams. .

  The size of the smoke-extinguishing device 40 is determined by the required weight of the solid fire extinguishing agent 62 and can be about 100 grams at the maximum. Therefore, the device main body 42 for storing the solid extinguishing agent 62 having such a weight is, for example, from B5. A book size of about A4 can be reduced.

  Inside the smoke-extinguishing device 40 containing the solid fire extinguishing agent 62, there is a flue 75 extending from the rear (lower side in the figure) of the fire extinguishing agent storage case 60 to the front (upward side) outlet pipe connection port 58. Forming. Thus, the formation of the flue 75 that wraps around from the rear (lower side in the figure) to the front (upper side in the figure) increases the distance between the solid fire extinguishing agent 62 and the ejection pipe connection port 58, and the direction of the flame and the ejection pipe connection port. The flue 75 is bent so that 58 does not have the same direction, so that the flame caused by the combustion of the solid fire extinguishing agent 62 does not blow directly from the ejection pipe connection port 58 into the discharge pipe 44.

  Further, in order to more effectively prevent flame ejection by the solid fire extinguishing agent 62, a flame ejection preventing member 80 that passes only an aerosol such as a wire mesh is disposed in the middle of the flue 75 as necessary. Is desirable. In this embodiment, the flame ejection preventing member 80 is disposed inside the support piece 65 extending from the rear opening (lower opening in the figure) of the extinguishing agent storage case 60.

  Specific examples of the flame ejection preventing member 80 include a structure in which a plurality of small-diameter pipes such as glass and porcelain are arranged to suppress the ejection of flame, a structure in which a plurality of wire meshes are arranged separately to suppress the ejection of flame, glass, There are a structure in which a plurality of balls such as porcelain are arranged to suppress the ejection of flame, and a structure in which a plurality of balls such as glass and porcelain are arranged between a plurality of wire nets to suppress the ejection of flame.

(Configuration of jet pipe and jet head)
FIG. 9 is a cross-sectional view showing a structure for attaching the ejection pipe to the heat insulating lid, and FIG. 10 is an explanatory view showing a sealing plate provided at the ejection outlet of the ejection head.

  As shown in FIG. 9, the module battery 18 has a through hole 26 a formed substantially at the center of the heat insulating lid 26, and a cylindrical ejection head 50 is arranged in the through hole 26 a by an elbow 45. The elbow 45 has the tip of the ejection pipe 44 inserted and connected to the horizontal connection port, the cylindrical ejection head 50 is inserted and fixed to the vertical connection port from below, and the flange 45a is integrated with the outside of the vertical connection port. By forming the flange 45a and fixing the flange 45a to the outside of the through hole 26a, the ejection head 50 is supported through the through hole 26a.

  A heat-resistant resin sealing plate 84 is attached to the opening at the lower end of the ejection head 50. An inner diameter flange portion 50a projecting to the inner diameter is formed at the opening of the ejection head 50, and a sealing plate 84 is disposed outside the inner diameter flange portion 50a via a heat resistant seal packing (not shown). The presser ring 86 is disposed on the inner ring flange portion 50 a and the sealing plate 84 is fixed by screwing the presser ring 86 into the inner diameter flange portion 50 a with a plurality of screws 88.

  Further, the signal line 48 that has passed through the ejection pipe 44, the elbow 45, and the ejection head 50 is drawn into the inside of the heat insulating lid 26 from the through holes 50b provided at the four positions in front of the inner flange 50a of the ejection head 50. The through-hole 50b is sealed with a heat-resistant sealant in a state where 48 is passed.

  The sealing plate 84 closes the opening of the ejection head 50 protruding inside the heat insulating lid 26, and the high temperature atmosphere in the heat insulating container maintained at about 300 ° C. in the operation state causes the ejection head 50, the elbow 45, and It blocks | blocks so that it may not enter into the ejection pipe 44, and suppresses the temperature rise of the elbow 45 and the ejection pipe 44 which are exposed outside. In addition, since the ejection pipe 44 has a sufficient length, while heat is transmitted to the apparatus main body 42 of the smoke-extinguishing fire extinguishing apparatus disposed on the outer surface of the heat insulating lid 26 away from the ejection head 50 attached to the elbow 45. Moreover, a high cooling effect is obtained by exposing the ejection pipe 44 to the outside air, and the temperature rise of the apparatus main body 42 is prevented.

  The upper surface temperature of the heat insulating lid 26 of the module battery 18 is set to a temperature that does not exceed 60 ° C., for example, which is safe even if an inspector or the like touches it. The temperature can be the same as the temperature, for example, not exceeding 60 ° C. In this case, the temperature of the elbow 45 supporting the ejection head 50 is higher than 60 ° C., but the temperature of the ejection pipe 44 decreases as the distance from the ejection head 50 increases with exposure to the outside air. In addition, at the connection position of the apparatus main body 42, it can be reliably suppressed to 60 ° C. or less, for example.

  For this reason, a solid fire extinguishing agent 62 that generates a fire extinguishing aerosol by combustion is accommodated in the apparatus main body 42, but the atmospheric temperature in the apparatus main body 42 is kept at 60 ° C. or less, and the ignition temperature of the solid fire extinguishing agent On the other hand, by keeping the temperature sufficiently low, it is possible to surely prevent a malfunction in which the solid fire extinguisher 62 is ignited by heating due to a high temperature operation of the module battery 18. In addition, an ignition circuit unit 68 is housed in the device main body 42 as an electric circuit. By keeping the atmospheric temperature in the device main body 42 at, for example, 60 ° C. or less, malfunctions and deterioration due to the temperature of circuit components are suppressed. This makes it possible to maintain stable circuit operation.

  As shown in FIG. 10, the sealing plate 84 has a cut groove formed on its surface to be ruptured by an increase in pressure when fire extinguishing aerosol is generated by combustion of the solid fire extinguishing agent 62. The cut grooves of the sealing plate 84 are radially radial so as to connect the outer ring groove 90 formed along the opening edge, the inner ring groove 92 formed in the center portion, and the outer ring groove 90 and the inner ring groove 92. The plurality of linear grooves 94 are formed.

  The strength of the sealing plate 84 can be set to a required predetermined strength by adjusting the thickness, material, and depth of the cut groove, thereby extinguishing fire due to combustion of the solid fire extinguishing agent 62. When the internal pressure increased by the generation of the aerosol exceeds the pressure corresponding to the set strength of the sealing plate 84, the sealing plate 84 is ruptured and the fire-extinguishing aerosol is ejected into the heat insulating container of the module battery 18. it can.

  When pressure exceeding the strength is applied to the sealing plate 84 due to the generation of fire-extinguishing aerosol due to combustion of the solid fire extinguishing agent 62, the outside of the sealing plate 84 is cracked at the outer ring groove 90, and the sealing plate With respect to the center side of 84, the portion of the inner ring groove 92 is broken, and further, the portion of the linear groove 94 is broken, so that the portion of the sealing plate 84 facing the opening of the ejection head 50 can be reliably separated and scattered.

  Further, by disposing the metal retaining ring 86 outside the sealing plate 84, when the sealing plate 84 bursts due to an increase in pressure, the inner edge portion of the retaining ring 86 becomes the outer ring groove of the sealing plate 84. 90 is a fulcrum when it is folded outward, and the outer ring groove 90 is cracked by being reliably broken by extrusion due to an increase in internal pressure, and the portion of the sealing plate 84 that is opposed to the opening of the ejection head 50 is reliably secured. Can be separated and scattered.

(Configuration of ignition circuit)
FIG. 11 is a circuit diagram showing an embodiment of an ignition circuit unit provided in the smoke-extinguishing device.

  As shown in FIG. 11, the ignition circuit unit 68 connects the sheath thermocouple 46 disposed in the heat insulating container of the module battery by a connector 95 by a signal line 48. The sheath thermocouple 46 has a thermocouple element 46a disposed in an extremely fine heat-resistant metal protective tube 46b such as stainless steel and is filled with ceramic at a high pressure. Since the outer shape is thin, for example, 1 mm or less, it can be easily bent. Can be placed where needed.

  The ignition circuit unit 68 is connected to a cable 52 by connecting a plug 74 to the connector 72. The cable 52 includes a power line 76, a signal line 77 for inputting an ignition control signal from the outside, and a fire extinguishing to the outside. A signal line 78 for outputting an activation signal is included.

  The ignition circuit unit 68 includes a multiplexer 96, an amplifier 98, a transistor 100, a relay 108 including normally-open relay contacts 110, 112, and 114, and resistors 102, 104, and 106.

  The multiplexer 96 connects, for example, four sheathed thermocouples 46 via the signal line 48, and sequentially switches the four inputs at a predetermined cycle and outputs them to the amplifier 98. The amplifier 98 amplifies the current signal flowing by the electromotive force generated by the thermocouple element 46a of the four sheathed thermocouples 46 switched by the multiplexer 96, and outputs an electromotive force detection signal. The temperature detection by the sheath thermocouple 46 can use the electromotive force generated by the thermocouple element 46a due to heat, so that it is not necessary to pass a current through the thermocouple element 46a and the power consumption can be reduced.

  The output of the amplifier 98 is connected to the base of the PNP transistor 100 through the resistor 106. In the normal monitoring state where the module battery 18 is operating at about 300 ° C., the output of the amplifier 98 is at the H level, and the emitter and base are approximately zero volts, so it is turned off, and the relay 108 connected as a load on the collector side is connected. Inactive state.

  The relay 108 connects the heater 70 between the power supply lines via the normally open relay contact 112. The normally open relay contact 110 of the relay 108 is connected between the emitter and collector of the transistor 100 to form a latch circuit. Further, a relay contact 114 is connected to output a fire extinguishing start signal to the outside.

  One of the sheathed thermocouples 46 installed at four locations in the heat insulating container of the module battery 18 receives heat due to an abnormality of the sodium / sulfur battery 30 and generates an electromotive force corresponding to a predetermined fire judgment temperature. When flowing, the amplifier 98 amplifies the input current that flows due to the generation of the electromotive force, and pulls the output to the L level. For this reason, a bias voltage is applied between the emitter and base of the transistor 100 by the voltage generated in the resistor 106, whereby the transistor 100 is turned on and the relay 108 is operated.

  When the relay 108 is activated, the normally open relay contact 112 is closed, the heater 70 is energized, the solid fire extinguisher 62 is ignited by heating due to the energization of the heater 70, and aerosol is generated by the combustion of the solid fire extinguisher 62. Squirt into the insulated container.

  Further, the relay contact 112 is closed by the operation of the relay 108, so that the relay 108 is latched in an operating state, thereby preventing a malfunction due to a variation in electromotive force from the sheath thermocouple 46.

  Further, when the relay contact 114 is closed, a fire extinguishing start signal indicating that a fire extinguishing operation has been performed to the outside is output from the signal line 78 via the connector 72 and the plug 74, and is provided, for example, in the monitoring center of the power storage system. Sent to a monitoring device to notify the occurrence of a fire and the activation of a smoke-extinguishing device.

  Here, the fire judgment temperature in the module battery container detected by the ignition circuit unit 68 is set to a higher fire judgment temperature of, for example, 400 ° C. because the upper limit temperature at which the module battery 18 can operate is about 360 degrees. To do. The fire judgment temperature is set to a predetermined temperature of 360 ° C. or higher, for example, lower than 400 ° C. when it is desired to increase the detection sensitivity, and is set to a predetermined temperature higher than 400 ° C., for example, when it is desired to reliably detect a fire.

  Further, an external signal line 77 is connected to the ignition circuit portion 68 via a plug 74 and a connector 72, and the plus side of the signal line 77 is connected to the output of the amplifier 98. When an ignition control signal is input from the outside via the signal line 77, the normally open relay contacts 110, 112, 114 are closed by the operation of the relay 108 by turning on the transistor 100, and the solid fire extinguisher is ignited by energizing the heater 70. A fire-extinguishing aerosol is generated, and the smoke-extinguishing device 40 can be fire-extinguished by remote control.

  For example, in the monitoring center of the power storage system 10, the remote fire extinguishing activation of the smoke extinguishing device by such an ignition control signal is monitored by measuring and displaying the internal temperature of the module battery 18 housed in the package 12 of FIG. Therefore, when an abnormal temperature rise exceeding 400 ° C., for example, occurs in a specific module battery, it is determined that there is a possibility of a fire, and a person in charge of the smoke-extinguishing device 40 of the module battery 18 causing the temperature abnormality is assigned. Based on this operation, it is possible to use such that the ignition control signal is transmitted to start the fire extinguishing.

  In the present embodiment, the case where the ignition circuit unit 68 is housed in the device main body 42 of the smoke extinguishing device 40 is taken as an example, but the ignition circuit unit 68 is separated from the device main body 42 and another circuit unit housing is provided. The main body 42 of the smoke-extinguishing device 40 provided in the circuit unit housing and the module battery 18 is stored in the body, and the circuit unit housing is installed in a place where the temperature in the package 12 shown in FIG. You may make it connect with a cable.

  In the circuit unit housing, the ignition circuit units 68 of the smoke-extinguishing devices 40 provided in the five module batteries 18 stored in the mount 16 of the package 12 are collectively stored and connected to each other by cables. To do. As a result, the temperature in the circuit unit housing in which the ignition circuit unit 68 is housed can be stored in the allowable operating temperature range of the inspection circuit unit 68, for example, 50 ° C. to 0 ° C., and the reliability of the inspection circuit unit 68 is increased. It is possible to ensure sufficient durability.

(Operation of smoke-extinguishing device)
FIG. 12 is an explanatory view showing the operation of the smoke-extinguishing device 40 provided in the module battery 18. In FIG. 12, when the ignition circuit unit 68 housed in the smoke-extinguishing device 40 detects a fire from the current flowing by the electromotive force of the sheath thermocouple 46 (see FIG. 7) disposed in the heat insulating container of the module battery 18, or When an ignition control signal is input from the outside, the heater 70 is energized and heated to ignite the solid fire extinguisher 62, and the solid fire extinguisher 62 is burned to generate a fire extinguishing aerosol.

  The fire-extinguishing aerosol generated by the combustion of the solid fire-extinguishing agent 62 is ejected from the rear opening (lower opening in the figure) of the fire-extinguishing agent storage case 60 via the flame ejection preventing member 80 and then passes through the flue 75 which is the surrounding cavity. The fire extinguishing aerosol 120 is ejected into the ejection head 50 closed by the ejection pipe connection port 58, the ejection pipe 44, the elbow 45 and the sealing plate 84, and the internal pressure of the ejection head 50 is increased. To increase. When the internal pressure increased by the generation of the fire-extinguishing aerosol exceeds the pressure corresponding to the set strength of the sealing plate 84, the sealing plate 84 is ruptured to release the ejection head 50 from closing, and the insulation container of the module battery 18 is released. The fire-extinguishing aerosol 120 is ejected into the interior at once, the inside of the heat insulating container is filled with the fire-extinguishing aerosol 80, and the fire due to the abnormality of the sodium / sulfur battery 30 is suppressed.

  In this case, the flame due to the combustion of the solid fire extinguishing agent 62 is ejected to the rear (lower side in the figure) of the extinguishing agent storage case 60, and the flame ejection preventing member 80 suppresses the blowing of the flame, and the flame is ejected forward (upward in the figure). There is no such thing as jetting into the jet pipe 44 from the pipe connection port 58. Further, the extinguishing agent storage case 60 is heated by the combustion of the solid extinguishing agent 62, but the contact with the casing 54 and the lid member 56 is supported by the support pieces 64, 65, 66 in a substantially floating state and the heat insulating structure with few contact parts. Therefore, the temperature rise of the outer casing 54 and the lid member 56 due to heat conduction is suppressed, and overheating of the smoke-extinguishing device 40 is prevented from causing a fire.

[Second Embodiment of Module Battery]
FIG. 13 is an explanatory view showing a module battery in which two smoke-extinguishing devices are installed, FIG. 14 is a cross-sectional view showing a part of the module battery of FIG. 13 together with the internal structure, and FIG. It is a top view.

  As shown in FIGS. 13, 14, and 15, in this embodiment, two smoke extinguishing devices 40 are installed in the module battery 18, and the smoke extinguishing device 40 includes an apparatus main body 42, an ejection pipe 44, and It consists of an elbow 45 fitted with a jet head. The apparatus main body 42 of the two smoke-extinguishing / extinguishing apparatuses 40 has an upper part protruding from the outer side surface in the longitudinal direction of the heat insulating lid 26 in the module battery 18, and an ejection pipe 44 having one end connected to the protruding part of the apparatus main body 42, When the upper surface of the heat insulating lid 26 is divided into halves, it is connected to elbows 45 arranged substantially at the respective centers, and the ejection head arranged at the lower part of the elbow 45 penetrates the through hole of the heat insulating lid 26 and opens inside. Yes. The details are basically the same as those shown in FIGS.

  Further, on the inner side of the heat insulating lid 26 in the module battery 18, for example, the temperature detection unit is divided into, for example, four locations in the radial direction around the two opening positions of the ejection head attached to the elbow 45 connected to each ejection tube 44. A sheathed thermocouple 46 that functions as a thermal thermocouple 46 is disposed. In the sheathed thermocouple 46, the four signal wires 48 drawn out from the device main bodies 42 are insulated through the insides of the ejection pipe 44, the elbow 45, and the ejection head 50. It is pulled in and connected to the inside of the lid 26.

  Further, the two smoke extinguishing devices 40 are connected to each other by a cable 52, and a fire is detected based on the thermocouple sheath 46 connected to the signal line of one of the smoke extinguishing devices 40, and solid fire extinguishing agent is burned. When fire-extinguishing aerosol is generated and ejected into the heat insulation container, an ignition control signal is sent to the other smoke-extinguishing device 40 via the signal line in the cable 52, and the solid fire-extinguishing agent is burned to generate the fire-extinguishing aerosol. In this way, the cooperative operation of jetting into the insulated container is performed.

  In this way, by providing two smoke-extinguishing devices 40 in the heat insulating container of the module battery 18, the number of temperature detection points by the sheath thermocouple 46 is increased, and for example, 320 sodium · Abnormal temperature when any of the sulfur batteries 30 reacts due to leakage of an active material due to abnormality is quickly detected, fire extinguishing aerosol is generated by combustion of the solid fire extinguisher, and the fire is suppressed by suppressing the fire extinguishing. Make it possible.

  In addition, by the cooperative operation of the two smoke-extinguishing devices 40, the amount of solid fire extinguishing agent used for fire extinguishing can be increased to easily increase the fire extinguishing performance. Further, when two smoke-extinguishing devices 40 are operated in a coordinated manner, if one of the smoke-extinguishing devices 40 fails to ignite the solid fire extinguisher, the other smoke-extinguishing device 40 normally ignites the solid fire extinguishing agent. Thus, a fail-safe function can be provided. Note that the number of smoke-extinguishing devices 40 provided in the module battery 18 may be three or more as necessary.

[Third Embodiment of Module Battery]
16 is a perspective view showing a module battery using a heat insulating lid having a structure in which a heat insulating plate for changing the heat radiation amount can be freely attached and detached, and FIG. 17 shows a state in which the heat insulating plate is arranged on the heat insulating lid of FIG. It is a perspective view.

  Heat radiation in the heat insulation container of the module battery 18 is performed in order to make the temperature distribution uniform when a large number of sodium / sulfur batteries housed in the heat insulation container constituted by the heat insulation box 24 and the heat insulation lid 26 are operated at a high temperature. The heat design is such that about 70 to 80% of the amount of heat is performed from the upper surface of the heat insulating lid 26. Specifically, the heat insulation box 24 has a vacuum heat insulation structure, but the heat insulation lid 26 has an air heat insulation structure without a vacuum heat insulation structure.

  The heat insulation box 24 and the heat insulation lid 36 have a vacuum heat insulation structure, the degree of vacuum of the heat insulation box 24 is increased, and the degree of vacuum of the heat insulation lid 26 is reduced, so that about 70 to 80% of the heat radiation amount of the entire module. May be performed from the upper surface of the heat insulating lid 26.

  Since the heat generation amount of the module battery 18 is large when the user load is large, the heat generation amount of the module battery 18 can be dealt with by the atmospheric heat insulating structure of the heat insulating lid 26. However, when the user load is small or when the heat generation amount decreases due to secular change, it is necessary to change the heat dissipation amount of the heat insulating lid 26 so as to decrease.

  Therefore, in the embodiment of FIG. 16, when a plurality of plate storage portions 115 divided by mountain-shaped partitions are formed on the upper surface of the heat insulating lid 26 having an atmospheric heat insulating structure, the amount of radiant heat of the heat insulating lid 26 is desired to be reduced. As shown in FIG. 17, the heat insulating plate 116 is disposed in the plate housing portion 115 of the heat insulating lid 26, and thereby, the heat radiation amount on the upper surface of the heat insulating lid 26 can be easily changed. The heat insulating plate 116 has a structure in which, for example, a glass mat serving as a heat insulating material is covered with an aluminum glass cloth.

  When the smoke-extinguishing and extinguishing device 40 is provided in the module battery 18 having such a structure that can change the heat radiation amount on the upper surface, the apparatus main body 42, the ejection pipe 44, and the ejection head at the lower part are provided as in the embodiment of FIG. The smoke-extinguishing and extinguishing device 40 constituted by the mounted elbow 45 is provided, but the heat insulating plate 116 disposed in the plate storage portion 115 where the elbow 45 is disposed is a longitudinal notch through which the elbow 45 is passed to the tip side as shown in FIG. With the structure in which 118 is formed, even if the smoke-extinguishing device 40 is provided, the heat radiation amount on the upper surface can be easily changed by attaching and detaching the heat insulating plate 115.

[Modification of the present invention]
(Ignition circuit part)
In the above embodiment, the ignition circuit unit of the smoke extinguishing device is operated by supplying power from the outside, but the ignition circuit unit is operated by incorporating a battery power source using a primary battery. Also good.

  In addition, the ignition circuit unit is not limited to the above embodiment, a circuit function for detecting a fire due to an abnormality of the sodium / sulfur battery and igniting the fixed fire extinguisher, and by inputting an ignition control signal from the outside to the solid fire extinguisher If a circuit function for igniting and a circuit function for outputting a fire extinguishing start signal to the outside are provided, an appropriate circuit can be obtained.

(Temperature detector)
In addition, the temperature detection unit is not limited to the above-described embodiment using a sheath thermocouple, and an appropriate temperature detection element that detects a temperature increase due to a fire in a high temperature environment of about 300 ° C. where the module battery operates is used. A temperature detection unit may be used.

  For example, as the temperature detection unit, a heat sensing cable may be installed in a heat insulating container of the module battery. In this case, the heat sensing cable is installed so as to pass above the arrangement positions of a large number of sodium / sulfur batteries. The heat-sensing cable is two twisted signal wires insulated with an insulating material that can withstand the operating temperature of the module battery. A voltage is applied from the smoke-extinguishing device between the two signal wires. When a high heat is generated due to an open breakdown of a sodium / sulfur battery, the pair of signal wires come into contact with a short circuit due to melting of the insulation coating, and a fire is detected when a sensing current flows.

  As an insulating material used for the heat-sensing cable of the present embodiment, for example, a heat-sensing cable that is insulation-coated using a mica tape whose main component is mica having a heat resistance of 600 ° C. can be used.

  In addition, the ignition circuit unit provided with the heat sensing cable is connected to one signal line of the heat sensing cable by disconnecting the resistor 104 from the minus side except for the multiplexer 96 and the amplifier 98 in the ignition circuit unit 68 of FIG. Then, a circuit configuration in which the other signal line of the heat sensing cable is connected to the minus side may be used.

(Configuration of jet pipe and jet head)
The material of the sealing plate 84 of the ejection head 50 is not made of heat-resistant resin, but heat-resistant glass, heat-resistant glass sheet, or glass fiber resin can be used.

  The ejection head 50 is not provided with the sealing plate 84, and the ejection pipe 44 is provided with an opening / closing valve having an actuator linked to the energization circuit of the heater 70 mounted on the ignition circuit section 68, so that the fire-extinguishing aerosol 120 is ejected. At the same time, the smoke-extinguishing device 40 and the module battery 18 which are always shut off may be communicated.

(Other)
The present invention is not limited to the above-described embodiment, includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above-described embodiment.

10: Power storage system 12: Package 14: Door 16: Mount 18: Module battery 20: Inlet gallery 22: Exhaust port 24: Insulation box 26: Insulation lid 28: Heater panel 30: Sodium / sulfur battery 32: Dry sand 40: Smoke-extinguishing device 42: ejection pipe connection port 44: ejection pipe 45: elbow 46: sheath thermocouple 48, 77, 78: signal line 50: ejection head 52: cable 54: casing 56: lid member 58: ejection pipe connection port 60: Fire extinguisher storage case 62: Solid fire extinguisher 64, 65, 66: Support piece 68: Ignition circuit section 70: Heater 72: Connector 74: Plug 75: Flue 76: Power line 80: Flame ejection prevention member 84: Seal Stop plate 96: Multiplexer 98: Amplifier 100: Transistor 108: Relay 110, 112, 114: Normally-open relay contact 115: Plate storage 116: Disconnect Plate 118: notch 120: fire extinguishing aerosol

Claims (10)

In a power storage system comprising a plurality of module batteries each containing a plurality of sodium / sulfur batteries in a container, and storing and using electric power in the module batteries,
A power storage system comprising a module battery container provided with a smoke extinguishing device that emits a fire-extinguishing aerosol into the container when a fire of the sodium-sulfur battery is detected.
The power storage system according to claim 1, wherein
The module battery container comprises a heat insulation box and a heat insulation lid with a heat insulation structure,
The smoke-extinguishing device comprises a device main body and a jet pipe, the device main body is arranged outside the heat insulating lid, and the other end of the jet pipe connected at one end to the device main body passes through the heat insulating lid. The power storage system is characterized in that it is introduced into a container and an outlet is opened.
2. The power storage system according to claim 1, wherein the ejection pipe of the smoke-extinguishing device is provided with a closing plate that breaks and opens by the ejection power of the fire-extinguishing aerosol at the ejection port located in the container. Power storage system featuring.
The power storage system according to claim 2,
The main body of the smoke-extinguishing device is:
A housing fixed to the outside of the heat insulating lid and provided with a connection port of the ejection pipe;
A solid fire extinguisher that is housed in the housing and generates the fire-fighting aerosol by combustion; and
A temperature detection unit for detecting a temperature in the container by a temperature detection element disposed in the container connected to a signal line drawn from the casing through the ejection pipe;
An ignition circuit unit for igniting and burning the solid fire extinguisher by energization overheating of a heater when the temperature detected by the temperature detection unit is equal to or higher than a predetermined temperature due to a fire of the sodium / sulfur battery;
A battery power supply for supplying power to the ignition circuit unit;
A power storage system comprising:
The power storage system according to claim 4, wherein
The temperature detection unit is arranged to disperse a plurality of temperature detection elements in the container, and is connected to each of a plurality of signal lines drawn from the housing through the ejection pipe into the container.
The ignition circuit unit ignites and burns the solid fire extinguisher by energizing overheating of a heater when a temperature detected by at least one of the plurality of temperature detecting elements is equal to or higher than a predetermined temperature due to a fire of the sodium / sulfur battery. A power storage system characterized by that.
6. The power storage system according to claim 4, wherein the temperature detection element is a thermocouple that generates an electromotive force according to the temperature in the container.
The power storage system according to claim 4 or 5,
The temperature detection element is a heat sensing cable that contacts a pair of signal wires in a short-circuited state by melting of the insulating coating when receiving heat from a fire,
When the short circuit of the heat sensing cable is detected, the ignition circuit unit ignites and burns the solid fire extinguisher by energization heating of a heater.
5. The power storage system according to claim 4, wherein the ignition circuit unit outputs a fire extinguishing start signal to the outside when the solid fire extinguisher is ignited and burned by energization heating of the heater. An electric power storage system.
5. The power storage system according to claim 4, wherein the ignition circuit unit ignites and burns the solid fire extinguisher by energization overheating of a heater when an ignition signal is input from the outside. system.
The power storage system according to claim 4, wherein
The housing of the smoke-extinguishing device is
A fire extinguishing agent storage case that is placed in a state of floating inside the housing via a support member and stores the solid fire extinguishing agent,
A flue structure that forms a flue that guides the fire-extinguishing aerosol spouted from the fire-extinguishing agent storage case to the spout, and
A flame ejection preventing member disposed in the flue;
A power storage system comprising:

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