Energy storage device

Abstract

The problem to be solved by the present invention is to provide an energy storage device capable of effectively utilizing energy. In order to solve the problem, the energy storage device (1) generates heat by means of a chemical reaction of a heat storage material (3) housed inside a container (10a) which is a double-wall container (10a) having an inner side wall (111) and an outer side wall (112), the pair of containers (10) is configured from a heat-generating-side container (11) in which the heat storage material (3) generates heat and a regeneration-side container (12) in which the heat storage material (3) used for heat generation is regenerated, and the pair of containers (10) are connected by a pipe (9) in which the ejector (4) is provided.

Description

Technical Field

[0001] The present invention relates to an energy storage device. Background Art

[0002] In the past, in order to suppress global warming, solar light or wind power generation has been known as renewable energy. Since renewable energy sometimes makes it difficult to stably supply electric power, various batteries are used for energy storage. In order to repeatedly regenerate energy, an energy storage device using chemical heat storage utilizing chemical reaction heat has been known. In order to improve such chemical reactions or thermal efficiency, it has been proposed to hold a heat storage material inside and dispose a container after a heat dissipation reaction in a passage that is depressurized using a vacuum pump or the like (for example, refer to Patent Document 1).

[0003] [Prior Art Documents]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016-118315 Summary of the Invention

[0006] [Problems to be Solved by the Invention]

[0007] Using a vacuum pump requires additional energy. In addition, in the technique disclosed in Patent Document 1, since the entire container is disposed in the depressurized passage, it is difficult to improve the efficiency of each reaction. Thus, there is a problem that it is difficult to effectively utilize energy.

[0008] [Technical Means for Solving the Problems]

[0009] (1) The present invention relates to an energy storage device (for example, energy storage device 1), which generates heat by a chemical reaction of a heat storage material (for example, heat storage material 3) stored inside a container (for example, container 10a). The container is composed of a double wall having an inner side wall (for example, inner side wall 111) and an outer side wall (for example, outer side wall 112). A pair of containers (for example, a pair of containers 10) is composed of a heat generation side container (for example, heat generation side container 11) for the heat storage material to generate heat and a regeneration side container (for example, regeneration side container 12) for regenerating the heat storage material that has been used for heat generation. The pair of containers is connected by a pipe (for example, pipe 9) provided with an ejector (for example, ejector 4).

[0010] (2) Preferably, the energy storage device has: a water vapor flow path (for example, the water vapor flow path 43) through which the water vapor generated in the heat generation side container flows, and the ejector is provided; and a negative pressure first flow path (for example, the negative pressure first flow path 41) that is connected from the ejector to the inside of the regeneration side container; and, using the negative pressure generated by the Venturi effect of the ejector, the air in the regeneration side container is sucked from the negative pressure first flow path to perform decompression.

[0011] (3) Preferably, the energy storage device has: a water vapor flow path through which the water vapor generated in the heat generation side container flows, and the ejector is provided; a check valve (for example, the check valve 45) disposed near the ejector; and a negative pressure second flow path (for example, the negative pressure second flow path 42) that is connected from the ejector to between the inner side wall and the outer side wall of each of the pair of containers via the check valve; and, using the negative pressure generated by the Venturi effect of the ejector, the air in the double wall of the container is sucked from the negative pressure second flow path to perform decompression.

[0012] (4) Preferably, the heat storage material is an alkaline earth metal. Water is supplied to the heat generation side container to heat the heat storage material, and the regeneration side container is heated to oxidize the hydroxide of the alkaline earth metal to regenerate the heat storage material. The energy storage device has a regenerated water vapor flow path (for example, the regenerated water vapor flow path 44) that connects the heat generation side container and the regeneration side container, and through which the water vapor generated in the regeneration side container flows, and the ejector is provided. Using the negative pressure generated by the Venturi effect of the ejector, the water vapor is sucked from the regeneration side container to the heat generation side container and supplied to the heat generation side container.

[0013] (5) Preferably, the heat storage material is a metal oxide that reacts with water. The pair of containers switch heating and water supply, and the heat generation side container and the regeneration side container alternate in such a way as to exchange their functions with each other.

[0014] (6) Preferably, the energy storage device has a water pipe portion (for example, the water pipe portion 5), and the water pipe portion is disposed on each of the pair of containers and allows water or hot water and water vapor to flow inside. In the regeneration side container, when the heat storage material is regenerated, water is not supplied to the water pipe portion, but hot water or water vapor inside the water pipe portion is supplied to the water pipe portion of the heat generation side container.

[0015] (7) The present invention relates to a method for manufacturing an energy storage device, which is a method for manufacturing the energy storage device according to (1) or (2), and the inner side wall and the outer side wall of the double wall are joined to each other in an atmospheric pressure state.

[0016] (Effects of the Invention)

[0017] According to the above (1), since the heat generation side container and the regeneration side container are connected by a pipe provided with an ejector, when the regeneration side container is decompressed, the air flow of water vapor generated from the heat generation side container can be utilized for decompression. Therefore, an electric vacuum pump or the like is not required, and the cost is low and no failure occurs, so that the regeneration side container can be easily decompressed. In addition, by decompressing the regeneration side container, the chemical reaction is promoted in one direction, thereby promoting oxidation, and the energy required for the regeneration of the heat storage material can be reduced.

[0018] According to the above (2), since the negative pressure generated by the Venturi effect of the ejector can be utilized to decompress the regeneration side container, an electric vacuum pump or the like is not required, and the cost is low and no failure occurs, so that the regeneration side container can be easily decompressed.

[0019] According to the above (3), since the negative pressure generated by the Venturi effect of the ejector 4 can be utilized to decompress the inner wall and the outer wall, an electric vacuum pump or the like is not required, and the cost is low and no failure occurs, so that the regeneration side container can be easily decompressed. In addition, since the space between the double walls can be decompressed and maintained in a substantially vacuum state, the heat insulation property is high and the thermal efficiency is good. Thus, the heat insulation material for the pair of containers 10 is not required, and recycling and the like become easy, and the environmental load is reduced.

[0020] According to the above (4), the water vapor generated by the endothermic reaction of the heat storage material 3 in the regeneration side container 12 is decompressed and sucked by the ejector 4. Since the water vapor generated during the regeneration of the heat storage material 3 is discharged outside the regeneration side container 12, the heat energy required for regeneration is reduced, and the temperature required for regeneration is also lowered. In addition, the time required for regeneration can be shortened. Further, the heat loss of the heated regeneration side container 12 is reduced by decompressing the air or water vapor inside the regeneration side container 12 by the ejector 4.

[0021] According to the above (5), by alternately switching the heat generation side container and the regeneration side container, energy regeneration and storage can be continuously performed.

[0022] According to the above (6), the water in the water pipe part heated during regeneration becomes water vapor and is supplied to the water pipe part 5 of the heat generation side container 11, so that the heat can be utilized without waste.

[0023] According to the above (7), when each of the pair of containers is a large container, since it is not necessary to perform welding in a substantially vacuum environment after decompression to manufacture a vacuum double-wall container, the manufacturing cost can be reduced. It is not necessary to spend a long time evacuating the inside of the welded vacuum double-wall container. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram showing the energy storage device of the present embodiment.

[0025] Figure 2A It is a perspective view of one of the pair of containers of the present embodiment.

[0026] Figure 2B It is a three-dimensional sectional view showing the inside of one of the pair of containers of the present embodiment.

[0027] Figure 2C It is a perspective view of the water pipe part and the heat unit inside one of the pair of containers of the present embodiment.

[0028] Figure 3 It is a schematic diagram showing the heat unit of the present embodiment. Detailed implementation mode

[0029] Hereinafter, with reference to the drawings, the embodiments of the present invention will be described in detail. The energy storage device 1 of the present embodiment is a device that circulates and stores energy by using chemical heat storage. The energy storage device 1 generates heat by the chemical reaction of the heat storage material 3 housed inside a pair of containers 10 composed of two containers 10a. As Figure 1 shown, the energy storage device 1 has a pair of containers 10, a heat storage material 3, a reaction part 2, an ejector 4, a water pipe part 5, a generator 6, a condenser 7, a tank 8, and a pipe 9. In addition, the energy storage device 1 has a water vapor flow path 43, a negative pressure first flow path 41, a negative pressure second flow path 42, and a regenerated water vapor flow path 44 composed of the pipe 9.

[0030] The heat storage material 3 is a chemical substance that is separated into a heat storage product and a generated fluid when heated, and releases heat by its reverse reaction. For example, the heat storage material 3 is an alkaline earth metal and reacts with water. Specifically, calcium oxide (Cao) and water vapor (H2O), magnesium oxide (Mgo) and water vapor (H2O), etc. can be cited. In the present embodiment, calcium oxide and water vapor are taken as examples for description.

[0031] The pair of containers 10 has a heat generation side container 11 for the heat storage material 3 to generate heat and a regeneration side container 12 for regenerating the heat storage material 3 that has been used for heat generation. The heat generation side container 11 and the regeneration side container 12 have the same structure, and are alternately used in such a way that heating and water supply are switched to exchange their functions. The heat generation side container 11 is supplied with water or water vapor so that the heat storage material 3 generates heat, and the regeneration side container 12 is heated to regenerate the heat storage material 3. The pair of containers 10 are connected by the pipe 9. It is configured that the pipe 9 is composed of pipes of each flow path through which the following water, hot water, water vapor, etc. flow.

[0032] As Figure 2A andFigure 2B As shown, in a pair of containers 10, each container 10a is composed of a double wall having an inner wall 111 and an outer wall 112. The container 10a is made of, for example, metal and has a space inside that can accommodate the following reaction section 2. The inner wall 111 is arranged inside the container 10a, and the outer wall 112 is arranged outside the container 10a. A space is formed between the inner wall 111 and the outer wall 112, and the inside is depressurized to near vacuum during the operation of the energy storage device 1.

[0033] The inner wall 111 and the outer wall 112 are joined to each other at atmospheric pressure during manufacturing. The inner wall 111 and the outer wall 112 are assembled and joined by known methods, such as being fastened by fastening members such as screws or bolts, or a sealing member is arranged between them, but they are not joined by welding. As a method for forming a double wall without using welding, for example, flange portions (not shown) can be formed at the upper ends of the inner wall 111 and the outer wall 112 in a non-overlapping manner, and the flange portions of the inner wall 111 and the outer wall 112 are sealed and fastened with bolts. The flange portions can be formed to extend outward in the circumferential direction from the upper end of the side surface of the container 10a, or can be formed to bend inward from the upper end of the side surface of the container 10a. In addition, the upper ends of the inner wall 111 and the outer wall 112 can be bent so as to approach each other, and the joint portion is sealed. Further, an upper cover 113 is arranged on the double-walled container 10a. The upper cover 113 can be fixed to the overlapping portion of the flange portions of the inner wall 111 and the outer wall 112 by bolts or the like. The inner wall 111 and the outer wall 112 are joined by methods other than welding, rather than by welding. By doing so, when each container in the pair of containers 10 is a large container, there is no need to perform welding in a substantially vacuum environment after depressurization to manufacture a vacuum double-walled container, so the manufacturing cost can be reduced.

[0034] As Figures 2A to 2C and Figure 3 shown, the reaction section 2 has a plurality of heat units 20 that cause a chemical reaction to occur. The reaction section 2 is arranged on the heat generation side container 11 and the regeneration side container 12 with the same configuration respectively. In the heat generation side container 11, water is supplied to calcium oxide in the reaction section 2 to cause a heat generation reaction, and in the regeneration side container 12, calcium hydroxide is heated to cause an endothermic reaction.

[0035] As Figure 3 shown, the heat units 20 are arranged so that they can be separated and replaced one by one. Each heat unit 20 has a metal container 21, a heat storage material 3, a lid member 23, a heating member 24, and a pipe member 25.

[0036] The metal container 21 has a container body 211 and a plurality of storage chambers 212.

[0037] The container body 211 is a shallow dish-shaped container with an open upper part, having a bottom surface 211a and a side wall 211b. The metal container 21 is formed of a magnetic metal. Specifically, the metal container 21 is made of magnetic stainless steel.

[0038] The plurality of storage chambers 212 are formed of a metallic honeycomb structure. Since the honeycomb structure is made of metal, it generates heat by electromagnetic induction heating. The honeycomb structure is arranged such that, in a state of being placed on the container body 211, the partition wall 212a extends upward from the bottom surface in the vertical direction toward the open upper part, and the storage chambers 212 are constituted by a plurality of spaces partitioned by the partition wall 212a. The height of the partition wall 212a is configured to not exceed the height of the container body 211 and be lower than the upper end of the side wall 211B of the container body 211.

[0039] The heat storage material 3 is formed of calcium oxide into a granular shape and constituted. The heat storage material 3 is filled and stored in the storage chamber 212 of the metal container 21. The granular material can be of any shape, such as granular, powdery, etc., and includes powdery and granular materials regardless of the particle size.

[0040] The lid member 23 is a metal lid provided on the upper part of the metal container 21 and covering the metal container 21. The lid member 23 has a through hole 23a through which steam can pass vertically. The specific shape of the lid member 23 can be a mesh shape or punched metal having circular holes formed on a flat plate.

[0041] The heating member 24 is a plate-shaped member provided at the lower part of the metal container 21. The heating member 24 uses an induction heater to heat the bottom surface 211a of the metal container 21. The heating member 24 is heated and raised in temperature by being energized.

[0042] The pipe member 25 is a non-magnetic metal cylindrical body provided above the lid member 23. Specifically, it is a copper pipe. The pipe member 25 is a water supply pipe having a water flow path 250 formed inside for water to flow through, and is a pipe integrally formed with an induction coil for heating. As Figure 3 shown, when the heat unit 20 is arranged in an up-and-down overlapping manner, the bottom surface 211a of the metal container 21 is arranged above the pipe member 25, and the lid member 23 is arranged below. An insulating plate 27 is provided between the pipe member 25 and the metal container 21 so that the pipe member 25 does not directly contact the metal container 21. The insulating plate 27 has a through hole and is made of an insulating and heat-resistant ceramic or glass, etc. As another configuration for insulating the metal container 21 from the pipe member 25, in addition to the insulating plate 27, a water-permeable pad (non-woven fabric), cloth (woven fabric), or sheet made of glass fiber or ceramic fiber can also be provided on the upper surface of the lid member having a through hole. The pipe member 25 has a pipe body 251, a dripping part 252, and an induction coil part 253.

[0043] The tube main body 251 has a tubular shape and is configured to be adjacent to and cover the lid member 23 as shown. The longitudinal direction of the tube main body 251 extends in the direction along the upper surface or the lower surface of the metal container 21. Figures 2A to 2C As shown, it is arranged adjacent to and covering the lid member 23. The longitudinal direction of the tube main body 251 extends in the direction along the upper surface or the lower surface of the metal container 21.

[0044] The drip part 252 is a slit provided on the side of the lid member 23 of the tube main body 251, that is, the lower part. When water flows through the inside of the tube main body 251, the drip part 252 causes the water to drip from the drip part 252 formed at the lower part and fall into the metal container 21 located below.

[0045] The induction coil part 253 is a copper wire wound in a coil shape on the surface of the tube main body 251. The induction coil part 253 is integrally formed with the tube main body 251. Both the tube main body 251 and the induction coil part 253 are heated, thereby heating the heat storage material 3.

[0046] The electric power for heating in the reaction part 2 described above can utilize renewable energy such as solar power generation or wind power. By operating the energy storage device 1 while using renewable energy, the unstable power supply can be used for the production of other energies and stored.

[0047] As Figure 1 shown, the ejector 4 is provided on the pipe 9. The ejector 4 attracts the high-pressure steam supplied from the heat-generating side container 11 and uses the Venturi effect to generate a negative pressure. The ejector 4 is provided on the following steam flow path 43.

[0048] The steam flow path 43 is a pipe 9 connected to a pair of containers 10, and is a flow path through which the steam generated in the heat-generating side container 11 flows when one of the pair of containers 10 functions as the heat-generating side container 11. As Figure 1 shown, the steam flow path 43 is provided with the ejector 4 and is connected to the generator 6 and the condenser 7. In Figure 2A and Figure 2B the steam flow path 43 is omitted. Although not shown in Figure 1 , the steam flow path 43 can extend from the right-side container 10a when the right-side container 10a of Figure 1 functions as the heat-generating side container 11.

[0049] The negative pressure first flow path 41 is a pipe 9 that connects from the ejector 4 to the inside of the regeneration side container 12 via a check valve 45 arranged near the ejector 4. In the negative pressure first flow path 41, the negative pressure generated by the Venturi effect of the ejector 4 is used to attract the air in the regeneration side container 12 to decompress. By decompressing and heating the inside of the regeneration side container 12, calcium hydroxide (Ca(OH)2) is regenerated into calcium oxide (CaO).

[0050] The negative pressure second flow path 42 is a pipe that connects from the ejector 4 via a check valve 45 disposed near the ejector 4 to the pipe 9 between the inner side wall 111 and the outer side wall 112 of each of the pair of containers 10. In the negative pressure second flow path 42, the negative pressure generated by the Venturi effect of the ejector 4 is used to suck the air inside the double walls of each container 10a for decompression.

[0051] The regenerated steam flow path 44 is a pipe that connects the heat generating side container 11 and the regenerating side container 12. As Figure 1 shown, an ejector 4 is provided on the regenerated steam flow path 44. The negative pressure generated by the Venturi effect of the ejector 4 is used to suck the steam inside the regenerating side container 12, and the sucked steam is supplied to the heat generating side container 11.

[0052] The generator 6 is disposed downstream of the steam flow path 43 and the ejector 4. The generator 6 generates electricity using the steam generated in the heat unit 20. The type of the generator 6 is not particularly limited as long as it can utilize steam, heat, pressure, etc. For example, it can be a steam turbine or a screw generator, etc. In addition, besides directly using steam, it can also be a device that generates electricity using heat, such as a thermoelectric element or a Stirling engine. In addition, electricity can also be generated using the energy when the steam is decompressed.

[0053] The condenser 7 is disposed downstream of the generator 6. The condenser 7 cools and condenses the steam generated in the heat unit 20 or the steam used for power generation into water. In the condenser 7, impurities such as carbon dioxide contained in the steam, etc. can be removed and supplied to the heat unit 20 as pure water.

[0054] The tank 8 is a closed container that stores the water condensed in the condenser 7. A heat unit water supply path 81 that supplies water to the heat unit 20 extends from the tank 8.

[0055] The heat unit water supply path 81 is connected to the heat unit 20 of each of the pair of containers 10. On the heat unit water supply path 81, a pump 82 is disposed. When one of the pair of containers 10 serves as the heat generating side container 11, water is supplied to the heat unit 20 of the heat generating side container 11. The heat unit water supply path 81 communicates with the water flow path 250 of the pipe member 25 in the heat unit 20. By supplying the pure water restored in the condenser 7 to the heat unit 20, the accidental generation of calcium carbonate, etc. is suppressed.

[0056] As Figures 2A to 2C shown, the water pipe part 5 is disposed inside each of the pair of containers 10 around the heat unit 20 so that water, hot water, steam, etc. can flow inside.

[0057] The water pipe part 5 has a vertical pipe 51, an upper side annular part 52, and a lower side annular part 53.

[0058] A plurality of vertical pipes 51 are arranged to surround the heat unit 20. The vertical pipes 51 are arranged such that the longitudinal direction of their substantially cylindrical pipes extends in the vertical direction, and they are arranged in a substantially circular pattern around the heat unit 20 when viewed from above.

[0059] The upper annular portion 52 is an annular member that connects the upper ends of the plurality of vertical pipes 51, and its interior is configured to be hollow.

[0060] The lower annular portion 53 is an annular member that connects the lower ends of the plurality of vertical pipes 51, and its interior is configured to be hollow.

[0061] The upper annular portion 52, the lower annular portion 53, and the vertical pipes 51 are internally connected, and liquid can move within each of them.

[0062] The water pipe portion 5 is connected to a water supply source such as a water supply, and water can be supplied to the interior from the water supply via the water supply path 54. In addition, when the pair of containers 10 or the heat unit 20 is heated, the temperature of the water pipe portion 5 rises, causing the water inside to turn into hot water or steam. The rising hot water or steam can be discharged from the water pipe portion 5 via the hot water path 55 and utilized. Further, during the regeneration of the heat storage material 3 in the regeneration-side container 12, instead of supplying water to the water pipe portion 5, hot water or steam inside the water pipe portion 5 is supplied to the water pipe portion 5 of the heat generation-side container 11 by setting a valve 55a or the like on the hot water path 55 or forming a supply flow path.

[0063] According to the present embodiment, the following effects are achieved.

[0064] (1) An energy storage device 1 generates heat by using a chemical reaction of a heat storage material 3 stored inside a container 10a, and the container 10a is composed of a double wall having an inner side wall 111 and an outer side wall 112. The pair of containers 10 is composed of a heat generation-side container 11 in which the heat storage material 3 generates heat and a regeneration-side container 12 in which the heat storage material 3 that has been used for heat generation is regenerated. The pair of containers 10 is connected by a pipe 9 provided with an ejector 4.

[0065] Since the heat generation-side container 11 and the regeneration-side container 12 are connected by the pipe 9 provided with the ejector 4, when the regeneration-side container 12 is decompressed, the air flow of the steam generated from the heat generation-side container 11 can be utilized for decompression. Therefore, there is no need for an electric vacuum pump or the like, which is inexpensive and does not malfunction, and thus the regeneration-side container 12 can be easily decompressed. In addition, by decompressing the regeneration-side container 12, the chemical reaction is promoted in one direction, thereby promoting oxidation and reducing the energy required for the regeneration of the heat storage material 3.

[0066] (2) According to this embodiment, the energy storage device 1 is configured to have: a water vapor flow path 43 through which the water vapor generated in the heat generation side container 11 flows, and an ejector 4 is provided; and a negative pressure first flow path 41 that is connected from the ejector 4 to the inside of the regeneration side container 12. The air inside the regeneration side container 12 is sucked from the negative pressure first flow path 41 by the negative pressure generated by the Venturi effect of the ejector 4 to perform decompression.

[0067] Since the regeneration side container 12 can be decompressed by using the negative pressure generated by the Venturi effect of the ejector 4, an electric vacuum pump or the like is not required, and the cost is low and no failure occurs, so that the regeneration side container 12 can be easily decompressed.

[0068] (3) According to this embodiment, the energy storage device 1 is configured to have: a water vapor flow path 43 through which the water vapor generated in the heat generation side container 11 flows, and an ejector 4 is provided; a check valve 45 disposed near the ejector 4; and a negative pressure second flow path 42 that is connected from the ejector 4 to between the inner side wall 111 and the outer side wall 112 of each of the pair of containers 10 via the check valve 45. The air inside the double-layer wall of the container 10a is sucked from the negative pressure second flow path 42 by the negative pressure generated by the Venturi effect of the ejector 4 to perform decompression.

[0069] Since the inner side wall 111 and the outer side wall 112 can be decompressed by using the negative pressure generated by the Venturi effect of the ejector 4, an electric vacuum pump or the like is not required, and the cost is low and no failure occurs, so that the regeneration side container 12 can be easily decompressed. In addition, since the space between the double-layer walls can be decompressed and maintained in a substantially vacuum state, the heat insulation performance is high and the thermal efficiency is good. Thus, the heat insulation material of the pair of containers 10 is not required, recovery and the like become easy, and the environmental load is reduced.

[0070] (4) According to this embodiment, the heat storage material 3 is composed of an alkaline earth metal. Water is supplied to the heat generation side container 11 so that the heat storage material 3 generates heat to heat the regeneration side container 12, and the hydroxide of the alkaline earth metal is oxidized to regenerate the heat storage material 3. The energy storage device 1 is configured to have a regenerated water vapor flow path 44 that connects the heat generation side container 11 and the regeneration side container 12, through which the water vapor generated from the regeneration side container 12 flows, and an ejector 4 is provided. The water vapor is sucked from the regeneration side container 12 to the heat generation side container 11 by the negative pressure generated by the Venturi effect of the ejector 4 and supplied to the heat generation side container 11.

[0071] The water vapor generated by the endothermic reaction of the heat storage material 3 in the regeneration-side container 12 is decompressed and sucked by the ejector 4. Since the water vapor generated during the regeneration of the heat storage material 3 is discharged outside the regeneration-side container 12, the thermal energy required for regeneration is reduced, and the temperature required for regeneration is also lowered. In addition, the time required for regeneration can be shortened. Further, the heat loss of the heated regeneration-side container 12 is reduced by decompressing the air or water vapor inside the regeneration-side container 12 by the ejector 4.

[0072] (5) According to the present embodiment, the heat storage material 3 is composed of a metal oxide that reacts with water, and the pair of containers 10 switch heating and water supply, so that the heat generation-side container 11 and the regeneration-side container 12 alternate in such a way as to exchange their functions.

[0073] By alternately switching the heat generation-side container 11 and the regeneration-side container 12, energy can be continuously regenerated and stored.

[0074] (6) According to the present embodiment, the energy storage device 1 is configured to have a water pipe portion 5, and the water pipe portion 5 is disposed on each of the pair of containers 10 and allows water or hot water and water vapor to flow inside. In the regeneration-side container 12, water is not supplied to the water pipe portion 5 during the regeneration of the heat storage material 3, but hot water or water vapor inside the water pipe portion 5 is supplied to the water pipe portion 5 of the heat generation-side container 11.

[0075] The water inside the water pipe portion 5 heated during regeneration becomes water vapor and is supplied to the water pipe portion 5 of the heat generation-side container 11, so that heat can be utilized without waste.

[0076] (7) According to the present embodiment, a method for manufacturing an energy storage device 1 joins the inner wall 111 and the outer wall 112 of the double wall in a state of atmospheric pressure.

[0077] When each of the pair of containers 10 is a large container, since it is not necessary to manufacture a vacuum double-wall container by welding in a substantially vacuum environment after decompression, the manufacturing cost can be reduced. In addition, it is not necessary to spend a long time evacuating the inside of the welded vacuum double-wall container.

[0078] In addition, the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within the scope that can achieve the object of the present invention are all included in the present invention. In the above-described embodiment, for the sake of convenience of explanation, one ejector 4 is illustrated, but there may be a plurality of ejectors 4, and they can be provided on each negative pressure flow path. In addition, various valves are provided as needed on the flow paths of air, water vapor, water, etc.

[0079] Reference numerals

[0080] 1 Energy storage device

[0081] 3 Heat storage material

[0082] 4 Injector

[0083] 5 Water pipe section

[0084] 9 Pipe

[0085] 10 Pair of containers

[0086] 10a Container

[0087] 11 Heat generation side container

[0088] 12 Regeneration side container

[0089] 41 Negative pressure first flow path

[0090] 42 Negative pressure second flow path

[0091] 43 Water vapor flow path

[0092] 44 Regenerated water vapor flow path

[0093] 45 Check valve

[0094] 111 Inner wall

[0095] 112 Outer wall

Claims

1. An energy storage device that generates heat by means of a chemical reaction of a heat storage material housed inside a container. The aforementioned container is composed of a double wall having an inner wall and an outer wall. A pair of containers consists of a heat generation side container for generating heat by the aforementioned heat storage material and a regeneration side container for regenerating the aforementioned heat storage material that has been used for heat generation. The aforementioned pair of containers is connected by a pipe provided with an ejector.

2. The energy storage device according to claim 1, wherein The energy storage device has: A steam flow path through which the steam generated in the aforementioned heat generation side container flows and which is provided with the aforementioned ejector; and, A negative pressure first flow path that connects from the aforementioned ejector to the inside of the aforementioned regeneration side container; and, Using the negative pressure generated by the Venturi effect of the aforementioned ejector, air inside the aforementioned regeneration side container is sucked from the aforementioned negative pressure first flow path for decompression.

3. The energy storage device according to claim 1 or 2, wherein, The energy storage device has: A steam flow path through which the steam generated in the aforementioned heat generation side container flows and which is provided with the aforementioned ejector; A check valve disposed near the aforementioned ejector; and, A negative pressure second flow path that connects from the aforementioned ejector via the aforementioned check valve to between the aforementioned inner wall and the aforementioned outer wall of each of the aforementioned pair of containers; and, Using the negative pressure generated by the Venturi effect of the aforementioned ejector, air inside the double wall of the aforementioned container is sucked from the aforementioned negative pressure second flow path for decompression.

4. The energy storage device according to claim 1 or 2, wherein The aforementioned heat storage material is an alkaline earth metal, Water is supplied to the aforementioned heat generation side container to cause the aforementioned heat storage material to generate heat, and the aforementioned regeneration side container is heated to oxidize the hydroxide of the aforementioned alkaline earth metal to regenerate the aforementioned heat storage material. The energy storage device has a regenerated steam flow path to connect the aforementioned heat generation side container and the aforementioned regeneration side container, through which the steam generated from the aforementioned regeneration side container flows, and which is provided with the aforementioned ejector, Using the negative pressure generated by the Venturi effect of the aforementioned ejector, steam is sucked from the aforementioned regeneration side container to the aforementioned heat generation side container and supplied to the aforementioned heat generation side container.

5. The energy storage device according to claim 1 or 2, wherein, The aforementioned heat storage material is a metal oxide that reacts with water, The aforementioned pair of containers switches heating and water supply, and the aforementioned heat generation side container and the aforementioned regeneration side container alternate in such a way as to exchange their functions with each other.

6. The energy storage device according to claim 5, wherein, The energy storage device has a water pipe portion that is disposed on each of the aforementioned pair of containers and through which water or hot water and steam can flow inside. In the aforementioned regeneration side container, when the aforementioned heat storage material is regenerated, water is not supplied to the aforementioned water pipe portion, but hot water or steam inside the aforementioned water pipe portion is supplied to the aforementioned water pipe portion of the aforementioned heat generation side container.

7. A method for manufacturing an energy storage device, which is a method for manufacturing the energy storage device according to claim 1 or 2, The aforementioned inner wall and the aforementioned outer wall of the aforementioned double wall are joined to each other under atmospheric pressure conditions.

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