JP6595899B2 - Power storage system for buildings - Google Patents

Description

  The present invention relates to a building power storage system in which a power storage device for electric power used in a building is arranged in a space under the floor of the building.

  In places where business activities are carried out in buildings, power storage devices are installed to reduce power costs by cutting power peaks, storing nighttime power, or storing regenerative energy. However, since the power storage device occupies a large space, it has been a challenge to secure an installation location that does not impose a place where business activities are performed.

  In response to this problem, Patent Document 1 describes that a power storage device is installed in an underfloor space, a wiring / pipe space, a space below a staircase, an underground pit, a rooftop or an outdoor open space, a parking lot basement, or the like. . This installation method has solved the above-mentioned problems, but the following new problems have arisen.

JP2007-063971

  1stly, in the structure of patent document 1, the heat exhaustion of the electrical storage apparatus was inadequate, and there existed a problem that the electrical storage apparatus containing a high performance hybrid storage battery could not fully be exhausted especially. Secondly, in the configuration of Patent Document 1, depending on the installation location, there is a problem that not only the room temperature in winter but also room temperature in summer increases due to exhaust heat of the power storage device. Thirdly, in the configuration of Patent Document 1, when a lithium ion secondary battery is included in the power storage device, there is a problem that safety such as operating temperature is not considered.

The present invention has been made in view of such conventional problems, and an object of the present invention is to sufficiently exhaust heat from a power storage device, and particularly to sufficiently provide a power storage device including a high-performance hybrid storage battery. The object is to provide a power storage system for buildings that can exhaust heat.
In addition to the above object, another object of the present invention is to provide a power storage system for buildings that sufficiently exhausts heat from the power storage device and uses the exhaust heat only in winter, and does not affect room temperature in summer. is there.
Furthermore, in addition to the above object, another object of the present invention is to provide a building power storage system in which safety such as operating temperature is taken into account when the power storage device includes a lithium ion secondary battery.

  As a result of intensive research in order to achieve the above object, the present inventor first arranges the power storage device in the underfloor space, conducts heat generated in the power storage device with the heat transfer device, and transfers the heat to the piping space. The present inventors have found that even if a power storage device including a high-performance hybrid storage battery can be exhausted by exhausting with a heat exhaust device disposed in at least one of the space above the floor and the external space of the building.

  In addition, the inventor can dissipate heat in the power storage device in a shorter time by disposing the heat exchange devices in two different spaces and selectively circulating the liquid in the lower temperature space, On the extension line, the heat exchange device is arranged at a position close to the air supply port and a position near the return air port of the living room space, and the heat exchange device that circulates the liquid in summer and winter is switched. As a result, the present inventors have found that the exhaust heat can be sufficiently exhausted and the exhaust heat can be used only in the winter so as not to affect the room temperature in the summer.

That is, the present invention relates to a secondary battery capable of charging and discharging electric power used in a building, and an electric power connected to the secondary battery and converting charging power to the secondary battery and discharging power from the secondary battery, respectively. A power storage device comprising a conversion unit; a heat transfer device that conducts heat generated by the power storage device; and a heat exhaust device that discharges heat conducted by the heat transfer device. Between the upper floor slab directly above the floor slab, there is an inner wall installed perpendicular to the floor slab and a floor installed parallel to the floor slab, and the floor space on each floor of the building is the outer wall and inner wall of the building A piping space between the two or more inner walls, a floor space between the floor slab excluding the piping space and the floor, and a floor space between the floor excluding the piping space and the upper floor slab. The power storage device is disposed in the underfloor space, and the heat exhaust device is disposed in the piping space and the above floor space. And disposed on at least one spatial building in outer space, a heat exchanger for discharging the ambient air heat liquid flowing in the pipe, the heat transfer device is provided between the power storage device and the heat exchanger device It is a liquid cooling device that circulates liquid in the installed piping and conducts heat, and each floor of the building further includes a ceiling installed parallel to the floor between the floor and the upper floor slab, The floor space on each floor of the building consists of a living room space between the floor and the ceiling excluding the piping space, and a ceiling space between the ceiling and the upper floor slab excluding the piping space. The building is disposed in at least one of a space and a ceiling space, and the building includes an air supply duct that supplies temperature-controlled air to the living room space, and a return air duct that returns the air that has passed through the living room space from the living room space; Air conditioner with low ceiling and inner wall of living room Both of them include an air supply port connected to the air supply duct and a return air port connected to the return air duct, and the heat exchange device is a first heat exchange disposed at a position close to the air supply port. And a second heat exchange device disposed at a position close to the return air port, and the liquid cooling device includes a first liquid cooling device installed between the power storage device and the first heat exchange device. The second liquid cooling device installed between the power storage device and the second heat exchange device, and the pipe for circulating the liquid is either one or both of the first heat exchange device and the second heat exchange device. a valve for switching the, there is provided a valve control unit for operating the valve based on the temperature of the outside air supplied to the air conditioner, the ascorbyl power storage system having a.

Here, in the above, the energy density of the single cell of the secondary battery is preferably 50 Wh / kg or more, and the power density is preferably 50 W / kg.
The secondary battery is formed by connecting in series a plurality of virtual batteries in which a non-aqueous secondary battery using a non-aqueous solution as an electrolyte and an aqueous secondary battery using an aqueous electrolyte are connected in parallel. A hybrid storage battery is preferred.
Moreover, it is preferable that a non-aqueous solution type secondary battery is a lithium ion secondary battery, and an aqueous solution type secondary battery is a lead acid battery.
Each of the lithium ion secondary batteries preferably has a battery management system including protection circuits for overtemperature, overcurrent, overcharge, and overdischarge.

According to the present invention, the exhaust heat of the power storage device is sufficient, and in particular, the power storage device including a high-performance hybrid storage battery can be sufficiently exhausted.
Further, according to the present invention, in addition to the above-described effects, the power storage device can be sufficiently exhausted and the exhausted heat can be used only in the winter so as not to affect the room temperature in the summer.
Furthermore, according to the present invention, in addition to the above-described effects, when the power storage device includes a lithium ion secondary battery, it is possible to achieve a state in which safety such as operating temperature is taken into consideration.

It is a front view which shows typically the arrangement | positioning in a building of one Embodiment of the electrical storage system for buildings of this invention. It is a block diagram which shows an example of the electrical system of the electrical storage system for buildings shown in FIG. It is a block diagram which shows an example of the piping system of the electrical storage system for buildings shown in FIG. It is a schematic diagram which shows schematic structure of one Embodiment of the secondary battery used for the electrical storage system for buildings shown in FIG.

  The building power storage system of the present invention will be described below in detail based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a front view schematically showing an in-building arrangement of an embodiment of a building power storage system according to the present invention.

  The building power storage system 10 of the present invention includes a power storage device 12, a heat transfer device 14, and a heat exhaust device 16. The power storage device 12 is connected to the secondary battery 12a capable of charging / discharging the power used in the building, and the secondary battery 12a, and each of the charging power to the secondary battery 12a and the discharging power from the secondary battery 12a. It consists of a power converter 12b for conversion. The heat transfer device 14 conducts heat generated in the power storage device 12. The heat exhaust device 16 exhausts the heat conducted by the heat transfer device 14.

  Each floor of the building 50 includes an inner wall 54 installed perpendicular to the floor slab and a floor 56 installed parallel to the floor slab between the floor slab and the upper floor slab directly above the floor slab. Here, the floor slab on the first floor of the building 50 corresponds to 52a, and the upper floor slab corresponds to 52b. The floor slab on the second floor of the building 50 corresponds to 52b, and the upper floor slab corresponds to 52c. The floor slab on the third floor of the building 50 corresponds to 52c, and the upper floor slab corresponds to 52d. 52d is also called a ceiling slab.

  The floor space 60 on each floor of the building 50 includes a piping space 62, an underfloor space 64, and an above-floor space 66. The piping space 62 is between the outer wall and the inner wall 54 of the building 50 or between the plurality of inner walls 54. The underfloor space 64 is between the floor slab excluding the piping space 62 and the floor 56, and the above-floor space 66 is between the floor 56 excluding the piping space 62 and the upper floor slab. Here, the floor slab and the upper floor slab of each floor of the building 50 correspond in the same manner as described above.

  Although FIG. 1 shows a three-story building 50, the present invention is not limited to this. That is, the building 50 may have any number of floors as long as it is on the first floor or higher. FIG. 1 shows two inner walls 54a and 54b installed near the outer wall of the building 50, but the present invention is not limited to this. In other words, any number of the inner walls 54 may be installed anywhere within the building 50. Further, FIG. 1 shows a piping space 62a between the outer wall and the inner wall 54a of the building 50 and a piping space 62b between the outer wall and the inner wall 54b of the building 50, but the present invention is not limited to this. It is not something. That is, the piping space 62 may be located anywhere between the outer wall and the inner wall 54 of the building 50 or between the plurality of inner walls 54.

  The power storage device 12 is disposed in the underfloor space 64, while the heat exhaust device 16 is disposed in at least one of the piping space 62, the floor space 66, and the external space of the building 50. In FIG. 1, the heat exhaust devices 16 a, 16 b, 16 c are arranged in the floor space 66 on the first floor and the second floor, the heat exhaust device 16 d is arranged in the piping space 62 b on the third floor, and the heat is exhausted in the external space of the building 50. Although the apparatus 16e is arrange | positioned and the state by which the heat-transfer apparatus 14a-14e was each installed between the heat storage apparatus 16a-16e from the bottom of the electrical storage apparatus 12 is described, this invention is limited to this is not. That is, the exhaust heat device 16 on each floor may be disposed in any space as long as it is at least one of the spaces constituting the floor space 60 on the floor and the external space of the building 50. Moreover, it may be arranged not in the space on that floor but in the space on another floor, but if the heat transfer device 14 becomes longer, the pipe line resistance of the internal piping increases, so it is arranged in the space on the adjacent floor. Is desirable. By setting it as such a structure, the electrical storage system 10 for buildings of this invention can fully heat-discharge the electrical storage apparatus 12. FIG.

  Each floor of the building 50 may further include a ceiling 58 installed in parallel to the floor 56 between the floor 56 and the upper floor slab. In that case, the floor space 66 on each floor of the building 50 is composed of a living room space 66a and a ceiling space 66b. Is between the ceiling 58 excluding the piping space 62 and the upper floor slab, and the heat exhaust device 16 may be disposed in at least one of the living room space 66a and the ceiling space 66b.

Next, the electrical system of the building power storage system of the present invention will be described. FIG. 2 is a block diagram illustrating an example of an electrical system of the building power storage system illustrated in FIG. 1.
A conventional commercial power supply line 20 for supplying power used in a building is connected to a power meter 24 connected to a commercial power source 22, a distribution board 26 connected to the power meter 24, and a distribution board 26. And an outlet 28. The commercial power supply line 20 is connected to the building power storage system 10 of the present invention via the switching device 30.

  The switching device 30 includes a charge switch 32 connected between the power converter 12b and the wattmeter 24, a discharge switch 34 connected to the power converter 12b, and between the discharge switch 34 and the distribution board 26. A backflow prevention diode 36 and a charge / discharge control unit 38 that opens and closes the charge switch 32 and the discharge switch 34 are connected.

  The alternating current from the conventional commercial power supply 22 is always supplied to the outlet 28 in the building 50 through the wattmeter 24 and the distribution board 26. The charging / discharging control unit 38 turns on the charging switch 32 during an inexpensive nighttime power period, whereby the alternating current from the commercial power supply 22 is converted into a direct current by the power conversion unit 12b, and the secondary of the direct current is obtained. Charging to the battery 12a is started. When the secondary battery 12a is fully charged, the charge / discharge control unit 38 turns off the charge switch 32 to stop the charging of the secondary battery 12a. Moreover, when the remaining capacity of the secondary battery 12a falls, the charging / discharging control part 38 restarts the charge to the secondary battery 12a by turning ON the charge switch 32 again.

  Next, in an expensive time zone other than the nighttime power time zone, the charge / discharge control unit 38 turns off the charge switch 32 to stop charging the secondary battery 12a. Although the alternating current from the conventional commercial power supply 22 is always supplied to the outlet 28, when the electric power demand in the building 50 increases due to simultaneous use or mass use of each electric appliance, the charge / discharge control unit 38 When the discharge switch 34 is turned on automatically or manually, the DC current from the secondary battery 12a charged in the night power hours is converted into the AC current by the power converter 12b, and the diode 36 and the distribution board The power supply to the outlet 28 of the alternating current through 26 is started.

  When the remaining capacity of the secondary battery 12a decreases to the lower limit value or when the power demand in the building 50 decreases, the charge / discharge control unit 38 turns off the discharge switch 34 to turn the secondary battery The power supply from the battery 12a to the outlet 28 is stopped. In this case, even if the power supply from the secondary battery 12a is stopped, the AC current from the conventional commercial power supply 22 is always supplied to the outlet 28, so that the AC current can be used.

Next, the heat exhaust apparatus and the heat transfer apparatus according to the first embodiment and their arrangement will be described. FIG. 3 is a block diagram illustrating an example of a piping system of the building power storage system illustrated in FIG. 1.
In the first embodiment, the exhaust heat device 16 is a heat exchange device 116 that discharges the heat of the liquid flowing in the piping to the surrounding air, and may be a radiator. The heat transfer device 14 is a liquid cooling device 114 that circulates liquid in a pipe installed between the power storage device 12 and the heat exchange device 116 to conduct heat. The type of liquid flowing in the pipe (for example, water) and the material of the pipe (for example, aluminum) are not particularly limited as long as heat can be conducted from the power storage device 12 to the heat exhausting device 16.

  The heat exchanging device 116 as the heat exhausting device 16 includes a first heat exchanging device 116a and a second heat exchanging device 116b, and the first heat exchanging device 116a includes the piping space 62 (for example, the heat exhausting device 16d) and the floor. The second heat exchange device 116b is disposed in one space among the space 66 (for example, the heat exhaust devices 16a, 16b, and 16c) and the external space of the building 50 (for example, the heat exhaust device 16e). You may arrange | position in spaces other than the space where the apparatus 116a is arrange | positioned. Furthermore, the liquid cooling device 114 as the heat transfer device 14 includes a first liquid cooling device 114 a and a second liquid cooling device 114 b, and the first liquid cooling device 114 a performs the first heat exchange from below the power storage device 12. The second liquid cooling device 114b may be installed between the power storage device 12 and the second heat exchange device 116b.

  The liquid cooling device 114 as the heat transfer device 14 further includes a valve 118 and a valve control unit 120, and the valve 118 is a pipe for circulating the liquid, the pipe of the first heat exchange device 116 a and the second heat exchange. You may switch to either or both of the piping of the apparatus 116b.

  Specifically, as shown in FIG. 3A, the first configuration of the first form of the pipe configuration of the first liquid cooling device 114a is the first heat exchange from one of the branch pipes provided below the power storage device 12, as shown in FIG. The first liquid cooling device 114a is configured to circulate liquid in the order of the device 116a, the return path side of the first liquid cooling device 114a, and the power storage device 12, and the second liquid cooling device 114b is forwarded from the other of the branch pipes. The second liquid cooling device 114b is configured to circulate the liquid in this order, the second heat exchange device 116b, the return path side of the second liquid cooling device 114b, and the lower part of the power storage device 12, and the forward path of the first liquid cooling device 114a. The first opening and closing valves 118a and 118b are provided on the side and the return side, respectively, and the second opening and closing valves 118c and 118d are provided on the forward side and the return side of the second liquid cooling device 114b, respectively.

  Then, the first valve control unit 120a simultaneously opens and closes the first on-off valves 118a and 118b and the second on-off valves 118c and 118d, so that the pipe for circulating the liquid is connected to the pipe of the first heat exchange device 116a and the second pipe. You may switch to either one or both of the piping of the heat exchange apparatus 116b. If both the first on-off valves 118a and 118b and the second on-off valves 118c and 118d are in the open position, the liquid can be circulated through both pipes. The power storage device 12 is disposed in a region where the first liquid cooling device 114a and the second liquid cooling device 114b overlap, and the heat generated in the power storage device 12 is generated by the first liquid cooling device 114a and the second liquid cooling device 114b. Conducted to this region.

  Further, as shown in FIG. 3 (b), the piping configuration of the second form is below the power storage device 12, on the forward path side of the third liquid cooling device 114c, the return path of the first heat exchange device 116a, and the third liquid cooling device 114c. The liquid cooling is performed so that the liquid is circulated in the following order: under the power storage device 12, under the forward path side of the fourth liquid cooling device 114 d, under the second heat exchange device 116 b, the return path side of the fourth liquid cooling device 114 d, and under the power storage device 12. A first bypass pipe is connected between first branch valves 118e and 118f provided on the forward path side and the return path side of the third liquid cooling device 114c, respectively, and the fourth liquid cooling device 114d and A second bypass pipe is connected between the second branch valves 118g and 118h provided on the return path side.

  Then, the second valve control unit 120b simultaneously switches the first branch valves 118e and 118f and the second branch valves 118g and 118h, thereby changing the pipe for circulating the liquid to the pipe of the first heat exchange device 116a and the second heat. You may switch to either one or both of the piping of the exchange apparatus 116b. If the first branch valves 118e and 118f and the second branch valves 118g and 118h are not in a bypass position, the liquid can be circulated through both pipes. The power storage device 12 is disposed in a region where the third liquid cooling device 114c and the fourth liquid cooling device 114d overlap, and the heat generated in the power storage device 12 is generated by the third liquid cooling device 114c and the fourth liquid cooling device 114d. Conducted to this region.

  The valve control unit 120 may operate the valve 118 based on the temperature of each space where the first heat exchange device 116a and the second heat exchange device 116b are arranged. Specifically, the valve control unit 120 compares the temperature of the space in which the first heat exchange device 116a is disposed with the temperature of the space in which the second heat exchange device 116b is disposed, and the space having the lower temperature. Control is performed so that heat is exhausted by the heat exchanging device 116 disposed in With such a configuration, the building power storage system 10 of the present invention can exhaust the power storage device 12 in a shorter time.

  The building 50 may include an air conditioning system 70 that adjusts the temperature of the air in the living room space 66a. The air conditioning system 70 includes an air conditioner 72, a refrigerator 74, a cooling tower 76, and a boiler 78. The air conditioner 72 includes a cooler 80 that cools the supplied outside air and the air returned from the living room space 66a, and these. There may be provided a heater 82 for heating the outside air and an outside air duct 84 for supplying outside air. The cooler 80 is connected to a refrigerator 74 via a cold water pipe, the refrigerator 74 is connected to a cooling tower 76 via a cooling water pipe, and a pipe for supplying makeup water is connected to the cooling tower 76. The The heater 82 is connected to the boiler 78 via a hot water pipe, and a pipe for supplying fuel is connected to the boiler 78.

  The chilled water piping is hermetically sealed, and chilled water (usually 5 ° C. to 7 ° C.) generated in the evaporator (evaporator) of the refrigerator 74, which is a cold heat source device, is sent to the cooler 80 of the air conditioner 72. This is a pipe that returns the cold water returned to 12 ° C. to the evaporator of the refrigerator 74 again. Further, the cooling water pipe is an open type, and the cooling water of about 37 ° C. sent from the condenser (condenser) of the refrigerator 74 which is a cold heat source device is sent to the cooling tower 76, and the cooling tower 76 reaches about 32 ° C. It is a pipe that cools and sends it back to the condenser of the refrigerator 74. Furthermore, the hot water pipe is hermetically sealed, and hot water (about 40 ° C. to 60 ° C.) generated in the boiler 78 which is a heat source device is sent to the heater 82 of the air conditioner 72 and returned to the boiler 78 for circulation. It is a pipe to be made.

  The air conditioner 72 may further include an air supply duct 86 and a return air duct 88. In that case, the air supply duct 86 supplies air whose temperature is adjusted using the cooler 80 and the heater 82 to the living room space 66a, and the return air duct 88 supplies the air that has passed through the living room space 66a. Return from the room 66a. In addition, at least one of the ceiling 58 and the inner wall 54 of the living room space 66 a includes an air supply port connected to the air supply duct 86 and a return air port connected to the return air duct 88. That is, any number of air supply ports and return air ports may be provided as long as they are at least one of the ceiling 58 and the inner wall 54 of the room space 66a.

  In this case, the heat exchange device 116 as the exhaust heat device 16 includes a first heat exchange device 116a and a second heat exchange device 116b, and the first heat exchange device 116a is close to the air supply port. The second heat exchange device 116b may be disposed at a position (for example, the exhaust heat device 16b) close to the return air port. Furthermore, the liquid cooling device 114 as the heat transfer device 14 includes a first liquid cooling device 114a or a third liquid cooling device 114c and a second liquid cooling device 114b or a fourth liquid cooling device 114d. The device 114a or the third liquid cooling device 114c is installed between the bottom of the power storage device 12 and the first heat exchange device 116a (for example, the heat transfer device 14a), and the second liquid cooling device 114b or the fourth liquid cooling device. 114d may be installed between the bottom of the power storage device 12 and the second heat exchange device 116b (for example, the heat transfer device 14b).

  The liquid cooling device 114 as the heat transfer device 14 further includes a valve 118 and a valve control unit 120, and the valve 118 is a pipe for circulating the liquid, the pipe of the first heat exchange device 116 a and the second heat exchange. You may switch to either or both of the piping of the apparatus 116b. Specifically, it is the same as the piping configuration of the first embodiment or the piping configuration of the second embodiment.

  The valve control unit 120 may operate the valve 118 based on the temperature of the outside air supplied to the air conditioner 72. Specifically, when the temperature of the outside air supplied to the air conditioner 72 is high as in the summer, the valve control unit 120 uses the second heat exchange device 116b disposed near the return air port. Control to exhaust heat. In addition, when the temperature of the outside air supplied to the air conditioner 72 is low as in winter, control is performed so that heat is exhausted by the first heat exchange device 116a disposed at a position close to the air supply port. By adopting such a configuration, the building power storage system 10 of the present invention sufficiently exhausts the power storage device 12 and uses the exhaust heat only in winter so as not to affect the room temperature in summer. Can do. In spring and autumn, control may be performed so that heat is exhausted by both the first heat exchange device 116a and the second heat exchange device 116b.

Next, a heat exhaust apparatus and a heat transfer apparatus according to the second embodiment will be described.
In the second embodiment, the exhaust heat device 16 is a heat exchange device that discharges the heat of the working fluid vapor flowing in the piping to the surrounding air. The heat transfer device 14 is a heat pipe that conducts heat by heating and evaporating the working fluid in the power storage device 12 and cooling and condensing the working fluid vapor in the heat exchange device. The type of hydraulic fluid that flows in the pipe (for example, water) and the material of the pipe (for example, copper) are not particularly limited as long as heat can be conducted from the power storage device 12 to the exhaust heat device 16.

Next, the secondary battery 12a constituting the power storage device 12 will be described. FIG. 4 is a schematic diagram showing a schematic configuration of an embodiment of a secondary battery used in the building power storage system shown in FIG. 1.
The performance and configuration of the secondary battery 12a are not particularly limited as long as the power used in the building can be charged and discharged, but the energy density of the single cell of the secondary battery is 50 Wh / kg or more, and the power density Is preferably 50 W / kg. The building power storage system 10 of the present invention can sufficiently exhaust heat even in the power storage device 12 including the high-performance secondary battery.

  The secondary battery 12a is a hybrid storage battery in which a plurality (four in the illustrated example) of virtual batteries 42 are connected in series. The virtual battery 42 includes a non-aqueous secondary battery that uses a non-aqueous solution as an electrolyte, and an aqueous battery. It is desirable to connect an aqueous secondary battery using an electrolytic solution in parallel. The non-aqueous solution secondary battery is desirably a lithium ion secondary battery 42a (LiB), and the aqueous solution-based secondary battery is desirably a lead storage battery 42b (PbB).

  Each virtual battery 42 preferably further includes a virtual battery balance circuit 44 that aligns the charge level between the virtual batteries and keeps the balance within a predetermined range. Further, in the hybrid storage battery, each lithium ion secondary battery 42a and each lead storage battery 42b need to be connected in parallel to form each virtual battery 42, but a plurality (four in the illustrated example) of virtual batteries 42 are required. Are connected in series, so that a plurality (four in the illustrated example) of lithium ion secondary batteries 42a-g composed of the lithium ion secondary batteries 42a connected in series and a plurality (four in the illustrated example) of lithium ion secondary batteries 42a-g. The lead storage battery group 42b-g including the lead storage batteries 42b connected in series may be configured as a unit, and each lithium ion secondary battery 42a and each lead storage battery 42b may be connected in parallel. By unitizing in this way, the same type of secondary batteries can be handled as a unit, and in particular, the lithium ion secondary battery group 42a-g can be easily made into a cassette module. Similarly, a virtual battery balance circuit group 44-g composed of a plurality (four in the illustrated example) of virtual battery balance circuits 44 connected in series may be configured as a unit.

Each lithium ion secondary battery 42a preferably has a battery management system 46 including protection circuits for overtemperature, overcurrent, overcharge and overdischarge. The battery management system 46 is also referred to as a battery management system (BMS), and the overtemperature protection circuit is set to operate at, for example, 61 ° C. or more or 0 ° C. or less. Set to operate at 117A or higher, the overcharge protection circuit is set to operate at 4.2V or higher, for example, and the overdischarge protection circuit is set to operate at 2.4V or lower, for example Is done. By adopting such a configuration, the building power storage system 10 of the present invention can be brought into a state in which safety such as operating temperature is taken into consideration when the power storage device 12 includes the lithium ion secondary battery 42a. it can.
The building power storage system of the present invention is basically configured as described above.

  The building power storage system of the present invention has been described in detail above. However, the present invention is not limited to the above description, and various modifications and changes may be made without departing from the spirit of the present invention. is there.

  The building power storage system of the present invention has sufficient heat exhaust from the power storage device. In particular, in addition to the effect that the power storage device including the high-performance hybrid storage battery can be sufficiently exhausted, the power storage device is sufficiently exhausted. The effect of being able to heat and use the exhaust heat only in winter, so that it does not affect the room temperature in summer, and when the power storage device includes a lithium ion secondary battery, safety such as operating temperature is improved. Since there is an effect that it can be considered, it is industrially useful.

DESCRIPTION OF SYMBOLS 10 Building power storage system 12 Power storage device 12a Secondary battery 12b Power conversion unit 14a, 14b, 14c, 14d, 14e Heat transfer device 16a, 16b, 16c, 16d, 16e Heat exhaust device 20 Commercial power supply line 22 Commercial power supply 24 Power Total 26 Distribution board 28 Outlet 30 Switching device 32 Charge switch 34 Discharge switch 36 Diode 38 Charge / discharge control part 42 Virtual battery 42a Lithium ion secondary battery 42a-g Lithium ion secondary battery group 42b Lead storage battery 42b-g Lead storage battery group 44 Virtual battery balance circuit 44-g Virtual battery balance circuit group 46 Battery management system 50 Building 52a, 52b, 52c Floor slab 52d Ceiling slab 54, 54a, 54b Inner wall 56 Floor 58 Ceiling 60 Floor space 62, 62a, 62b Piping space 64 Under the floor Between 66 Floor space 66a Living room space 66b Ceiling space 70 Air conditioning system 72 Air conditioner 74 Refrigerator 76 Cooling tower 78 Boiler 80 Cooler 82 Heater 84 Outside air duct 86 Supply air duct 88 Return air duct 114, 114a, 114b, 114c, 114d Liquid cooling device 116, 116a, 116b Heat exchange device 118, 118a, 118b, 118c, 118d, 118e, 118f, 118g, 118h Valve 120, 120a, 120b Valve controller

Claims (5)

A secondary battery capable of charging and discharging power used in a building, and a power conversion unit connected to the secondary battery and converting charging power to the secondary battery and discharging power from the secondary battery, respectively A power storage device comprising:
A heat transfer device for conducting heat generated in the power storage device;
A heat exhaust device that exhausts heat conducted by the heat transfer device, and
Each floor of the building includes an inner wall installed perpendicular to the floor slab and a floor installed in parallel to the floor slab, between the floor slab and the upper floor slab directly above the floor slab,
The floor space of each floor of the building includes a piping space between the outer wall and the inner wall of the building or a plurality of the inner walls, an underfloor space between the floor slab and the floor excluding the piping space, The floor space between the floor excluding the piping space and the upper floor slab, and
The power storage device is disposed in the underfloor space,
The exhaust heat device is a heat exchange device that is disposed in at least one of the piping space, the floor space, and the external space of the building, and discharges the heat of the liquid flowing in the piping to the surrounding air,
The heat transfer device is a liquid cooling device that conducts heat by circulating a liquid in a pipe installed between the power storage device and the heat exchange device,
Each floor of the building further includes a ceiling installed in parallel with the floor between the floor and the upper floor slab,
The floor space on each floor of the building is composed of a living room space between the floor excluding the piping space and the ceiling, and a ceiling space between the ceiling excluding the piping space and the upper floor slab. ,
The exhaust heat device is disposed in at least one of the living room space and the ceiling space,
The building comprises an air conditioner having an air supply duct for supplying temperature-controlled air to the living room space, and a return air duct for returning air that has passed through the living room space from the living room space,
At least one of the ceiling and the inner wall of the living room space includes an air supply port connected to the air supply duct and a return air port connected to the return air duct,
The heat exchange device comprises a first heat exchange device disposed at a position close to the air supply port, and a second heat exchange device disposed at a position close to the return air port,
The liquid cooling device includes a first liquid cooling device installed between the power storage device and the first heat exchange device, and a second liquid installed between the power storage device and the second heat exchange device. Based on the temperature of the outside air supplied to the cooling device, the valve for switching the piping for circulating the liquid to one or both of the piping of the first heat exchange device and the piping of the second heat exchange device, and the air conditioner ascorbyl power storage system Yusuke a valve control unit, the operating the valve Te. The building power storage system according to claim 1, wherein the energy density of the single cell of the secondary battery is 50 Wh / kg or more, and the power density is 50 W / kg. The secondary battery is a hybrid in which a plurality of virtual batteries formed by connecting in parallel a non-aqueous secondary battery using a non-aqueous solution as an electrolyte and an aqueous secondary battery using an aqueous electrolyte are connected in series. The building power storage system according to claim 1, wherein the building power storage system is a storage battery. The building power storage system according to claim 3 , wherein the non-aqueous solution secondary battery is a lithium ion secondary battery, and the aqueous solution secondary battery is a lead storage battery. 5. The building power storage system according to claim 4 , wherein each of the lithium ion secondary batteries includes a battery management system including protection circuits for overtemperature, overcurrent, overcharge, and overdischarge.

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