JP2009266556A - Electric storage device, and heat utilization system - Google Patents

Abstract

A power storage device and a heat utilization system capable of effectively utilizing heat generated when charging and discharging a storage battery are obtained.
A power storage device is provided below the floor of the house. The power storage device 30 includes a battery 32 and a heat storage material 34 disposed so as to surround the battery 32. A heat medium circulation pipe 36 through which a heat medium circulates is wound around the heat storage material 34, and pipe end portions 36 </ b> A and 36 </ b> B of the heat medium circulation pipe 36 are connected to a floor heating device 42 disposed inside the floor 20. Has been. Pipe end portions 36 </ b> C and 36 </ b> D of the heat medium circulation pipe 36 are connected to the hot water supply device 44. Pumps 46, 50 and on-off valves 48, 52 are provided at the pipe ends 36A, 36C. The control device 38 controls the driving of the pumps 46, 50 and the on-off of the on-off valves 48, 52.
[Selection] Figure 2

Description

  The present invention relates to a power storage device and a heat utilization system including the power storage device.

Patent Document 1 below discloses a residential power storage system in which a storage battery is housed in an underfloor space of a house. In this residential power storage system, cheap nighttime power can be stored in a storage battery, and the power can be supplied to a predetermined air conditioning facility in the daytime.
JP 2000-323113 A

  However, in the above prior art, heat is generated when charging / discharging (charging and discharging) the storage battery. This heat may shorten the life of the storage battery, and in some cases, it becomes necessary to install a cooling fan for forcibly cooling the storage battery.

  In view of the above facts, an object of the present invention is to provide a power storage device and a heat utilization system that can effectively use heat generated when charging and discharging a storage battery.

  The power storage device according to the first aspect of the present invention is a battery to be charged / discharged, a heat storage material that is provided in the vicinity of the battery, stores heat generated during charging / discharging of the battery, and heat storage stored in the heat storage material. And a control device for controlling the heat radiation amount of heat stored in the heat storage material, and using the heat exhausted by the heat radiation of the heat storage material for a heat utilization device.

  According to a second aspect of the invention, there is provided the power storage device according to the first aspect, further comprising a temperature sensor that detects a temperature of the battery, and the control device is configured to control the heat of the battery based on the temperature detected by the temperature sensor. It is characterized by controlling not to take too much.

  According to a third aspect of the present invention, in the power storage device according to the first or second aspect, the battery and the heat storage material are accommodated under a floor of a building.

  A heat utilization system according to the invention of claim 4 is connected to the power storage device according to any one of claims 1 to 3 and the heat storage device, and uses exhaust heat due to heat radiation of the heat storage material. And a heating device as the heat utilization device for heating.

  A heat utilization system according to a fifth aspect of the present invention is a power storage device according to any one of the first to third aspects, a duct connected to at least one room in a building, and the power storage device. An air blower as the heat utilization device that is provided between the duct and blows air-conditioned air heated by exhaust heat due to heat radiation of the heat storage material to the room through the duct. To do.

  A heat utilization system according to a sixth aspect of the invention uses the power storage device according to any one of the first to third aspects and the heat storage device connected to the power storage device and exhausted by heat dissipation of the heat storage material. And a hot water supply device as the heat utilization device that heats water for hot water supply.

  A seventh aspect of the present invention is the heat utilization system according to any one of the fourth to sixth aspects, wherein the heat storage material and at least one of the heating device, the blower, and the hot water supply device. A heating medium circulation path through which the heating medium is circulated, a pump provided in the heating medium circulation path, circulating the heating medium, opening and closing the heating medium circulation path or flowing through the heating medium circulation path And an on-off valve that changes the path of the above.

  Invention of Claim 8 is provided with the temperature sensor for thermal storage materials which detects the temperature of the said thermal storage material in the heat utilization system of Claim 7, The said control apparatus is the temperature detected with the said thermal storage material temperature sensor Based on the above, the driving of the pump and the opening / closing of the on-off valve are controlled.

  According to the first aspect of the present invention, heat is generated when the battery is charged / discharged (charging and discharging), and the heat is stored in the heat storage material provided in the vicinity of the battery. At that time, the amount of heat stored in the heat storage material is controlled by the control device, and the amount of heat released from the heat stored in the heat storage material is controlled. And the waste heat by heat dissipation of a thermal storage material is utilized for a heat | fever utilization apparatus (for example, a heating apparatus, a hot water supply apparatus, etc.), The heat | fever generate | occur | produced at the time of charging / discharging of a battery can be heat-stored and can be utilized effectively. Moreover, a battery can be cooled and the fall of the lifetime of a battery can be suppressed because the heat which generate | occur | produces at the time of charging / discharging of a battery is stored in a thermal storage material.

  According to the second aspect of the present invention, the temperature of the battery is detected by the temperature sensor, and based on the temperature detected by the temperature sensor, control is performed so that the battery does not take too much heat. Thereby, the temperature of a battery can be managed appropriately and the fall of the lifetime of a battery can be suppressed effectively.

  According to this invention of Claim 3, since the battery and the thermal storage material are accommodated under the floor of a building, the empty space under the floor of a building can be used effectively. For this reason, it is not necessary to secure a space for installing the battery and the heat storage material inside or outside the building, and space saving is possible. Moreover, since the temperature and humidity are stabilized under the floor of the building, it is possible to further suppress a decrease in battery life.

  According to this invention of Claim 4, the heating apparatus as a heat utilization apparatus is connected to the electrical storage apparatus of any one of Claim 1 to Claim 3, and a heating apparatus is heat dissipation of a thermal storage material. Heating by using the exhaust heat by Thereby, the heat which generate | occur | produces at the time of charging / discharging of a battery can be heat-stored, and can be utilized effectively for a heating apparatus.

  According to this invention of Claim 5, a duct is connected with the at least 1 room in a building, Between the electrical storage apparatus of any one of Claim 1- Claim 3, and a duct. A blower as a heat utilization device is provided. The blower blows the conditioned air heated by the exhaust heat generated by the heat dissipation of the heat storage material to the room in the building through the duct. Thereby, the heat generated during charging / discharging of the battery can be stored and effectively used.

  According to this invention of Claim 6, the hot water supply device as a heat | fever utilization apparatus is connected to the electrical storage apparatus of any one of Claim 1 to Claim 3, and a hot water supply apparatus is heat storage material. Water for hot water supply is heated by utilizing exhaust heat generated by heat radiation. Thereby, the heat which generate | occur | produces at the time of charging / discharging of a battery can be heat-stored, and can be utilized effectively for a hot-water supply apparatus.

  According to the seventh aspect of the present invention, the heat medium circulation path is connected between the heat storage material and at least one of the heating apparatus, the blower apparatus, and the hot water supply apparatus, and the heat medium circulation path becomes a predetermined path. Thus, the heat medium is circulated in the heat medium circulation path by opening and closing the on-off valve and driving the pump provided in the heat medium circulation path. Thereby, the exhaust heat by heat radiation of the heat storage material is transmitted to at least one of the heating device, the air blower, and the hot water supply device via the heat medium circulating in the heat medium circulation path. For this reason, without complicating the configuration, the heat generated during charging and discharging of the battery is stored in the heat storage material, and the exhaust heat due to the heat dissipation of the heat storage material is transmitted to at least one of the heating device, the air blower, and the hot water supply device. Can be used effectively.

  According to the eighth aspect of the present invention, the temperature of the heat storage material is detected by the temperature sensor for the heat storage material, and based on the temperature detected by the temperature sensor for the heat storage material, the drive of the pump and the opening / closing of the on-off valve are performed by the control device. Is controlled. For example, when the temperature of the heat storage material becomes equal to or higher than a predetermined value, the heat medium circulating path is driven and the on-off valve is opened to control the heat stored in the heat storage material. It can be transmitted to at least one of a heating device, a blower, and a hot water supply device. Thereby, while being able to prevent or suppress damaging a battery with the heat of a thermal storage material, the heat of a thermal storage material can be utilized efficiently.

  As described above, the power storage device according to the first aspect of the present invention has an excellent effect that heat generated during charging and discharging of the battery can be stored in the heat storage material and effectively used.

  The power storage device according to the second aspect of the present invention has an excellent effect of being able to appropriately manage the temperature of the battery and effectively suppressing a decrease in the battery life.

  The power storage device according to the present invention described in claim 3 does not need to secure a space for installing the battery and the heat storage material indoors or outdoors in the building, and can save space and further reduce the life of the battery. It has an excellent effect that it can be further suppressed.

  The heat utilization system according to the present invention described in claim 4 has an excellent effect that the heat generated during charging and discharging of the battery can be stored and effectively used for the heating device.

  The heat utilization system according to the present invention described in claim 5 has an excellent effect that heat generated during charging and discharging of the battery can be stored and effectively used for blowing air-conditioned air.

  The heat utilization system according to the present invention described in claim 6 has an excellent effect that the heat generated during charging and discharging of the battery can be stored and effectively used in the hot water supply apparatus.

  The heat utilization system according to the present invention described in claim 7 can effectively utilize the exhaust heat generated by the heat radiation of the heat storage material by transmitting it to at least one of the heating device, the air blower, and the hot water supply device without complicating the configuration. It has an excellent effect of being able to.

  The heat utilization system according to the present invention described in claim 8 has an excellent effect of being able to prevent or suppress the battery from being damaged by the heat of the heat storage material and efficiently use the heat of the heat storage material. .

[First Embodiment]
Hereinafter, a first embodiment of a heat utilization system equipped with a power storage device according to the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 shows a house 10 as a building to which the heat utilization system according to the present embodiment is applied. As shown in this figure, the outer wall 14 of the house 10 is provided with a power receiving panel 16 for receiving commercial power from an electric wire 13 suspended on a power pole 12. In the power receiving panel 16, the received AC power is distributed to two systems: an electric system directed to the distribution board 18 disposed indoors and an electric system directed to the power storage device 30 disposed below the floor 20. Yes. AC power directed from the power receiving panel 16 to the distribution panel 18 is distributed to a plurality of household outlets (not shown) through the distribution panel 18.

  A solar panel 24 that uses sunlight as energy is disposed on the roof 22 of the house 10. The solar panel 24 is connected to the distribution board 18 via a power conditioner 26. In the power conditioner 26, DC power input from the solar panel 24 is converted into AC power, and is distributed to a plurality of household outlets (not shown) through the distribution board 18.

  As shown in FIG. 1, the power storage device 30 constitutes a part of the heat utilization system 40 and is installed in a storage space 28 provided in the lower part of the floor 20 of the house 10. As shown in FIG. 2, the power storage device 30 includes a rectangular battery 32 that charges and discharges (charges and discharges) electric power, and a cylindrical heat storage material 34 that is disposed so as to surround the battery 32. I have. The heat storage material 34 includes an upper wall portion 34A, side wall portions 34B on both sides, and a lower wall portion 34C. Each of the upper wall portion 34A, the side wall portion 34B, and the lower wall portion 34C is internally heated. A heat medium circulation pipe 36 is wound as a heat medium circulation path through which the medium is circulated. Furthermore, the power storage device 30 includes a control device 38 that controls the amount of heat stored in the heat storage material 34 and also controls the heat radiation amount of the heat stored in the heat storage material 34.

  The heat storage material 34 is made of a latent heat storage material, and stores heat in the heat storage material 34 when the surrounding temperature rises above the relative temperature, and radiates heat from the heat storage material 34 when the surrounding temperature falls to the relative temperature. That is, when the temperature near the battery 32 rises above the relativization temperature due to the heat generated during charging / discharging of the battery 32, the heat is stored in the heat storage material 34 disposed adjacent to the battery 32, and the temperature near the battery 32 becomes relative. When the temperature falls, the heat storage material 34 is dissipated.

  As shown in FIG. 1, in addition to the power storage device 30, the heat utilization system 40 includes a floor heating device 42 disposed inside the floor 20 and a hot water supply device disposed in a storage space 28 below the floor 20. 44. As shown in FIG. 2, one end 36 </ b> A of the heat medium circulation pipe 36 wound around the upper wall 34 </ b> A of the heat storage material 34 is connected to the floor heating device 42. The pipe end portion 36A of 36 is provided with a pump 46 for circulating the heat medium and an on-off valve 48 for opening and closing the pipe end portion 36A of the heat medium circulating pipe 36. Inside the floor heating device 42, a heating medium circulation path (not shown) connected to the pipe end 36 </ b> A of the heating medium circulation pipe 36 and circulating the heating medium is stretched. Further, the downstream side of the heat medium circulation path (not shown) is connected to the other pipe end portion 36B of the heat medium circulation pipe 36 wound around the upper wall portion 34A of the heat storage material 34. By driving the pump 46 and opening the on-off valve 48, the heat medium is circulated in the heat medium circulation pipe 36 in the direction of the arrow.

  In the present embodiment, as the floor heating device 42, for example, an oil heater that heats the vicinity of the surface of the floor 20 by heat radiation by circulating oil (heat medium) is used. In addition, although illustration is abbreviate | omitted, the heat-medium circulation pipe 36 wound around the upper wall part 34A of the thermal storage material 34 is wound on the side wall part 34B of one side (right side in FIG. 2) of the thermal storage material 34 on the way. The heating medium circulating pipe 36 is connected to return to the upper wall portion 34A. It is not limited to the heat medium circulation pipe 36 having this configuration.

  One pipe end 36C of a heat medium circulation pipe 36 wound around the other side wall part 34B (the left side in FIG. 2) of the heat storage material 34 is connected to the hot water supply device 44, and this pipe end part 36C. Are provided with a pump 50 for circulating the heat medium and an on-off valve 52 for opening and closing the pipe end 36C of the heat medium circulation pipe 36. The hot water supply device 44 includes a hot water storage tank (not shown) in which hot water for hot water supply is stored. Around the hot water storage tank (not shown), heat is connected to the pipe end 36C of the heat medium circulation pipe 36. A heating medium circulation path (not shown) through which the medium is circulated is wound. Further, the downstream side of the heat medium circulation path (not shown) is connected to the other pipe end portion 36D of the heat medium circulation pipe 36 wound around the side wall portion 34B of the heat storage material 34. By driving the pump 50 and opening the on-off valve 52, the heat medium is circulated in the heat medium circulation pipe 36 in the direction of the arrow.

  As the hot water supply device 44, for example, a water heater equipped with a hot water storage tank (not shown), an HP (heat pump) type hot water heater, or the like can be used. In addition, although illustration is abbreviate | omitted, the heat-medium circulation pipe 36 wound around the side wall part 34B of one side (left side in FIG. 2) of the heat storage material 34 is wound on the lower wall part 34C of the heat storage material 34 on the way. The heating medium circulating pipe 36 is connected to return to the side wall 34B. It is not limited to the heat medium circulation pipe 36 having this configuration.

  A battery temperature sensor 54 that detects the temperature of the battery 32 is attached to the surface of the battery 32, and a heat storage material temperature sensor 56 that detects the temperature of the heat storage material 34 is attached to the surface of the heat storage material 34. It is attached. The control device 38 controls the driving of the pumps 46 and 50 and the opening and closing of the on-off valves 48 and 52 based on the temperature detected by the battery temperature sensor 54 and the temperature detected by the heat storage material temperature sensor 56. Accordingly, the amount of heat stored in the heat storage material 34 is controlled, and the amount of heat released from the heat stored in the heat storage material 34 is controlled. At that time, the control device 38 performs control so as not to take too much heat of the battery 32 based on the temperature detected by the battery temperature sensor 54.

  Next, the operation and effect of this embodiment will be described.

  In the heat utilization system 40, for example, late-night power with a low electricity bill is charged in the battery 32, and the power charged in the battery 32 is used (discharged) in each electric device or the like in the house 10 during the daytime. . Heat is generated during charging / discharging of the battery 32, and the heat is stored in the heat storage material 34 adjacent to the battery 32. In particular, when the battery 32 is rapidly charged and discharged, a large amount of heat is generated, and the heat is stored in the heat storage material 34. At that time, the temperature of the battery 32 is detected by the battery temperature sensor 54, the temperature of the heat storage material 34 is detected by the temperature sensor 56 for heat storage material, and the control device 38 controls the temperature of the battery 32 and the heat storage material 34. Done. The heat generated during charging / discharging of the battery 32 is stored in the heat storage material 34, whereby the battery 32 can be cooled, and a reduction in the life of the battery 32 can be suppressed. Moreover, since the storage space 28 under the floor 20 of the house 10 is stabilized in temperature and humidity, it is possible to effectively suppress a decrease in the life of the battery 32.

  When the temperature around the heat storage material 34 falls to the relative temperature, heat is radiated from the heat storage material 34. The heat release of the heat storage material 34 is controlled by the control device 38 based on the temperature detected by the battery temperature sensor 54 and the temperature detected by the heat storage material temperature sensor 56. Specifically, the control device 38 opens at least one of the on-off valve 48 and the on-off valve 52 and drives the pumps 46 and 50 of the opened heat medium circulation pipe 36. Further, the control is performed even when the temperature detected by the battery temperature sensor 54 and the temperature detected by the heat storage material temperature sensor 56 may cause the heat storage capacity of the heat storage material 34 to become full or damage the battery 32. The device 38 opens at least one of the on-off valve 48 and the on-off valve 52 and drives the pumps 46 and 50 of the opened heat medium circulation pipe 36. As a result, the heat medium circulates inside the heat medium circulation pipe 36, exhaust heat radiated from the heat storage material 34 is transmitted to at least one of the floor heating device 42 and the hot water supply device 44, and the floor heating device 42 and the hot water supply device are transmitted. At least one of 44 is activated. In the floor heating device 42, the vicinity of the surface of the floor 20 can be heated by heat radiation. Further, the hot water supply device 44 can heat hot water in the hot water storage tank.

  In summer, heating by the floor heating device 42 is not necessary, so that heat radiated from the heat storage material 34 can be sent to the hot water supply device 44. That is, it is preferable that the heat radiated from the heat storage material 34 is turned to the hot water supply device 44 in the summer and to the floor heating device 42 and the hot water supply device 44 in the winter. Further, the control device 38 monitors the temperature of the battery 32 and opens and closes the on-off valves 48 and 52 as necessary so that the heat of the battery 32 is not taken too much. Thereby, the heat stored in the heat storage material 34 can be used efficiently.

  In such a heat utilization system 40, the heat generated during charging / discharging of the battery 32 is stored in the heat storage material 34, and the floor heating device 42 and the hot water supply device 44 are operated using the exhaust heat generated by the heat dissipation of the heat storage material 34. Can do. For this reason, the heat generated during charging and discharging of the battery 32 can be stored and effectively used. Moreover, since the heat generated during charging / discharging of the battery 32 is stored in the heat storage material 34, the battery 32 is cooled, so that a reduction in the life of the battery 32 can be suppressed. Therefore, it is not necessary to provide a cooling fan for cooling the battery separately, and it is not necessary to use electric power to drive the cooling fan.

  In addition, since the power storage device 30 is accommodated in the storage space 28 below the floor 20 of the house 10, the empty space below the floor 20 can be effectively utilized. For this reason, it is not necessary to secure a space for installing the power storage device indoors or outdoors in the building, and space saving is possible. Further, since the temperature and humidity of the storage space 28 below the floor 20 are stabilized, the lifetime of the battery 32 can be further suppressed.

[Second Embodiment]
Hereinafter, a second embodiment of the heat utilization system in which the power storage device according to the present invention is mounted will be described with reference to FIG. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 3, the heat utilization system 70 is provided with a battery 32, a heat storage material 34, a power storage device 72 including a control device 38 and the like. The power storage device 72 is provided with a box-shaped casing 74 so as to surround the battery 32 and the heat storage material 34. An opening (not shown) is provided on one side surface (right side surface in the figure) of the casing 74, and a blower 76 is provided at a position adjacent to the opening. One end of a duct 78 is connected to the wall surface of the air blower 76 opposite to the casing 74, and the other end of the duct 78 is an air outlet 84 provided in the wall portion 82 of the room 80 in the house 10. It is connected to.

  The blower device 76 includes a fan 77, and the conditioned air heated by the exhaust heat generated by the heat dissipation of the heat storage material 34 by the rotation of the fan 77 is blown to the room 80 through the duct 78. Specifically, the ambient temperature in the casing 74 is heated by the exhaust heat due to the heat radiation of the heat storage material 34, and the warmed air in the casing 74 is heated by the rotation of the fan 77 as hot air to the room 80 via the duct 78. It is configured to be fed. The fan 77 is configured to be driven by electric power supplied from a power source in the house 10. In FIG. 3, the duct 78 is connected to one room 80 in the house 10, but the downstream side of the duct 78 may be branched and connected to a plurality of rooms in the house 10.

  In such a heat utilization system 70, heat generated during charging / discharging of the battery 32 is stored in the heat storage material 34 adjacent to the battery 32. Then, the air in the casing 74 is warmed by the exhaust heat due to the heat radiation of the heat storage material 34, and the air in the casing 74 is supplied as warm air to the duct 78 by the rotation of the fan 77 of the blower 76, and Hot air is blown into the 80. Therefore, the heat generated during charging / discharging of the battery 32 can be stored in the heat storage material 34, and the exhaust heat generated by the heat dissipation of the heat storage material 34 can be sent as warm air to the room 80 by the blower 76. The heat generated during discharge can be used effectively.

[Supplementary explanation of the embodiment described above]
(1) In the above-described embodiment, the power storage devices 30 and 72 are disposed in the lower part of the floor 20 of the house 10. However, the present invention is not limited thereto, and for example, the power storage devices 30 and 72 are disposed outdoors or indoors in the house 10. May be. In addition, the power storage devices 30 and 72 may be disposed not only in the house 10 but also in a commercial, industrial, or agricultural building.

  (2) In the above-described embodiment, the floor heating device 42 and the hot water supply device 44 are connected to the power storage device 30, and the blower device 76 and the hot water supply device 44 are connected to the power storage device 72. A utilization device may be connected. Moreover, although the floor heating apparatus 42 was the structure which carries out floor heating by thermal radiation, it is not limited to this, Other heating apparatuses may be sufficient. Moreover, although the fan 77 of the air blower 76 was a structure driven with the electric power supplied from the power supply in the house 10, not only this but electrically using the waste heat by heat dissipation of the thermal storage material 34 is used. The structure which drives a fan may be sufficient.

  (3) In the above-described embodiment, the heat medium circulation pipe 36 is opened and closed by opening and closing the on-off valve. However, the present invention is not limited to this. For example, the heat medium flowing through the heat medium circulation pipe by opening and closing the on-off valve. The configuration may be such that the route is changed.

  (4) In the above-described embodiment, the heat generated during charging / discharging of the battery 32 disposed in the house 10 is stored in the heat storage material and used in the heat utilization system of the house 10. Heat generated during charging / discharging of a battery other than the above may be stored in a heat storage material and used in a building heat utilization system. For example, a configuration may be used in which heat generated during charging and discharging of a battery of an EV vehicle (electric vehicle) is stored in a heat storage material, and exhaust heat due to heat radiation of the heat storage material is used for a building heating device, a hot water supply device, and the like. In particular, when the battery of the EV vehicle is rapidly charged and discharged, the heat generation temperature increases. However, by storing this heat in the heat storage material, the battery can be cooled, and damage and deterioration of the battery can be suppressed.

(5) In the above-described embodiment, the heat storage material is provided so as to be adjacent to the battery, but not limited thereto, the heat storage material may be provided so as to be adjacent to the fuel cell. In this case, power can be generated by operating the fuel cell, and heat generated from the fuel cell is stored in the heat storage material. By storing heat in the heat storage material, the fuel cell can be cooled, and the exhaust heat generated by the heat dissipation of the heat storage material can be effectively used in a hot water supply device or the like.

It is a side view showing the house to which the heat utilization system concerning a 1st embodiment is applied. It is a block diagram which shows the heat utilization system shown in FIG. It is a side view which shows the house to which the heat utilization system which concerns on 2nd Embodiment is applied.

Explanation of symbols

10 Housing (building)
20 Floor 28 Storage space 30 Power storage device 32 Battery 34 Heat storage material 36 Heat medium circulation pipe (heat medium circulation path)
38 Control Device 40 Heat Utilization System 42 Floor Heating Device (Heating Device)
44 Hot-water supply device 46 Pump 48 On-off valve 50 Pump 52 On-off valve 54 Temperature sensor for battery (temperature sensor)
56 Thermal storage material temperature sensor 70 Heat utilization system 72 Power storage device 76 Blower device 78 Duct 80 Room

Claims (8)

A battery to be charged and discharged;
A heat storage material that is provided in the vicinity of the battery and stores heat generated during charging and discharging of the battery; and
A control device that controls the amount of heat stored in the heat storage material and controls the amount of heat released from the heat stored in the heat storage material, and
A power storage device using exhaust heat generated by heat radiation of the heat storage material in a heat utilization device. A temperature sensor for detecting the temperature of the battery;
The power storage device according to claim 1, wherein the control device performs control so as not to take too much heat of the battery based on a temperature detected by the temperature sensor.   The power storage device according to claim 1, wherein the battery and the heat storage material are housed under a floor of a building. The power storage device according to any one of claims 1 to 3,
A heating device connected to the heat storage device and heating the waste heat using heat discharged from the heat storage material,
A heat utilization system comprising: The power storage device according to any one of claims 1 to 3,
A duct connected to at least one room in the building;
A blower device as the heat utilization device that is provided between the power storage device and the duct and blows air-conditioned air heated by exhaust heat due to heat dissipation of the heat storage material to the room through the duct;
A heat utilization system comprising: The power storage device according to any one of claims 1 to 3,
A hot water supply device as the heat utilization device that is connected to the power storage device and heats water for hot water supply using exhaust heat due to heat radiation of the heat storage material,
A heat utilization system comprising: A heat medium circulation path that is connected between the heat storage material and at least one of the heating device, the blower device, and the hot water supply device, and in which a heat medium is circulated,
A pump provided in the heat medium circulation path for circulating the heat medium;
An on-off valve that opens and closes the heating medium circulation path or changes the path of the heating medium flowing through the heating medium circulation path;
The heat utilization system according to any one of claims 4 to 6, further comprising: A heat storage material temperature sensor for detecting the temperature of the heat storage material;
The heat utilization system according to claim 7, wherein the control device controls driving of the pump and opening / closing of the on-off valve based on a temperature detected by the temperature sensor for the heat storage material.

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