JP6726896B2 - Power storage system - Google Patents

Description

The present invention relates to a stationary power storage system.

In recent years, household power storage systems have become widespread. The electricity storage system installed in the house is used for peak cut and backup. If the power storage system is installed outdoors, it will be exposed to direct sunlight and wind and rain, and the temperature difference will also be large, resulting in significant deterioration of the battery. On the other hand, when installed indoors, the living space becomes smaller. Therefore, it can be considered to install it in the space between the inner wall and the outer wall.

A power storage system requires a power conditioner that converts direct-current power discharged from a storage battery into alternating-current power, converts alternating-current power supplied from a commercial power system (hereinafter referred to as a system) into direct-current power, and charges the direct-current power. Conventionally, even when the storage battery is installed between the inner wall and the outer wall, the power conditioner is generally installed indoors (for example, see Patent Document 1).

JP 2000-328797 A

The power conditioner converts electric power using an inverter that uses a switching element. Switching loss occurs during power conversion by the inverter, and the loss that has not been converted into power is released as heat. The heat generated by the power conditioner becomes a factor that raises the temperature of the room, and particularly in the summer, it reduces the cooling effect of the air conditioner.

The present invention has been made in view of such circumstances, and an object thereof is to provide a power storage system in which a power storage unit is sufficiently protected and a living space is hardly adversely affected.

In order to solve the above-mentioned problems, a power storage system according to an aspect of the present invention includes a housing sandwiched between a ceiling and a floor of a building, a power storage unit disposed in the housing, and a discharge from the power storage unit. And a power converter that converts the DC power to AC power or another DC power and outputs it to the outside, and converts the AC power or DC power input from the outside to a predetermined DC power to charge the power storage unit. , Is provided. The power conversion unit is arranged in the housing above the power storage unit, and a first vent for communicating with the ceiling above the building is formed on the top surface of the housing, and the power conversion unit is provided on the bottom surface of the housing. A second vent is formed to ventilate the underfloor of the building.

According to the present invention, it is possible to realize a power storage system in which the power storage unit is sufficiently protected and the living space is hardly adversely affected.

1 is a perspective view showing an external configuration (before installation) of a power storage system according to a first embodiment of the present invention. 1 is a perspective view showing an external configuration (after installation) of a power storage system according to a first embodiment of the present invention. 3A and 3B are side cross-sectional views of the power storage system according to the first embodiment of the present invention. It is a perspective view which shows the external appearance structure (before installation) of the electrical storage system which concerns on Example 2 of this invention. It is a perspective view which shows the external appearance structure (after installation) of the electrical storage system which concerns on Example 2 of this invention. 6A and 6B are side cross-sectional views of the power storage system according to the second embodiment of the present invention. 7A and 7B are diagrams showing a configuration example of the power conversion unit. 8A and 8B are diagrams showing a configuration example of the power storage unit. 9A to 9C are diagrams showing a configuration example of the storage battery holder. FIGS. 10A and 10B show the configuration of a power storage system using the power conversion unit shown in FIGS. 7A and 7B and the power storage unit shown in FIGS. 8A and 8B. It is a perspective view shown. It is a figure showing an example of circuit composition of an electric storage system. It is a perspective view which shows the external structure of the electrical storage system which concerns on Example 3 of this invention. It is a perspective view which shows the internal structure of the electrical storage system which concerns on Example 3 of this invention. It is a perspective view which shows the external appearance structure (before slide adjustment) of the electrical storage system which concerns on Example 4 of this invention. It is a perspective view which shows the external appearance structure (after slide adjustment) of the electrical storage system which concerns on Example 4 of this invention. It is a perspective view which shows the external appearance structure of the electrical storage system which concerns on Example 5 of this invention.

1 is a perspective view showing an external configuration (before installation) of a power storage system 1 according to a first embodiment of the present invention. FIG. 2 is a perspective view showing an external configuration (after installation) of the power storage system 1 according to the first embodiment of the present invention. Example 1 Example 1 is an example of a wall-front installation type power storage system 1. The power storage system 1 of the front wall type is mainly an installation method for an existing house. The housing 10 of the power storage system 1 is composed of a flat metal housing having a pair of wide surfaces. A mounting plate 6a is installed between two pillars 5a and 5b on the wall in the building. A plurality of receiving portions 61 for fixing the housing 10 of the power storage system 1 is formed on the mounting plate 6a. A plurality of hooks (not shown) corresponding to the positions of the plurality of receiving portions 61 are formed on the back surface of the housing 10 of the power storage system 1, and the housing 10 of the power storage system 1 includes the mounting plate 6a. It is fixed in front of the wall by hooking a plurality of hooks (not shown) on the plurality of receivers 61.

On the upper part of the power storage system 1, a wiring section 40 for connecting to the indoor wiring 7 behind the ceiling is installed. In the wiring part 40, a plurality of terminal parts for connecting with indoor wiring and a plurality of breaker switches 42 are exposed, and these are covered with a wiring part cover 41. An electric worker (or user) can remove the wiring part cover 41 and operate the breaker switch 42.

The wiring part 40 is covered with the blindfold plate 13 after the power storage system 1 is installed. The blindfold plate 13 is placed and fixed on the top surface of the housing 10. The height of the housing 10 after the blindfold plate 13 is placed is designed to be substantially the same as the length from the floor surface to the ceiling surface. That is, the housing 10 is installed so as to be sandwiched between the ceiling and the floor. On the top surface of the housing 10, upper ventilation holes 11a and 11b for ventilation with the space above the ceiling are formed. First lower ventilation holes 12 a and 12 b are formed in the lower part of the front surface of the housing 10 to ventilate the room.

3A and 3B are side cross-sectional views of the power storage system 1 according to the first embodiment of the present invention. The mounting plate 6a is installed on the outer surface of the inner wall 3a. A second lower ventilation hole 12c is formed on the bottom surface of the housing 10 of the power storage system 1 for communicating with the underfloor. A ventilation hole 4a is formed in the floor plate 4 of the building at a position corresponding to the second lower ventilation hole 12c installed on the bottom surface of the housing 10 of the power storage system 1. Similarly, a ventilation hole 2a is formed in the ceiling plate 2 of the building at a position corresponding to the upper ventilation port 11b installed on the top surface of the housing 10 of the power storage system 1. These ventilation holes 2 a and 4 a are opened in advance by an operator before installing the power storage system 1.

In the housing 10, the power storage unit 20, the power conversion unit 30, and the wiring unit 40 are sequentially arranged in the direction from the bottom surface side to the top surface side. Power storage unit 20 is configured to include a lithium ion storage battery, a nickel hydrogen storage battery, a lead storage battery, an electric double layer capacitor, a lithium ion capacitor, or the like. Hereinafter, in this specification, an example including a lithium ion storage battery is assumed.

The power conversion unit 30 converts the DC power discharged from the power storage unit 20 into AC power and outputs the AC power to the indoor wiring 7 via the wiring unit 40. In addition, the AC power input from the indoor wiring 7 via the wiring unit 40 is converted into DC power to charge the power storage unit 20. The power conversion unit 30 includes a bidirectional inverter alone or a combination of a bidirectional DC-DC converter and a bidirectional inverter.

The bidirectional inverter includes, for example, a bridge circuit in which four or six switching elements are bridge-connected. By controlling the duty ratio of the switching element, the input/output of the bidirectional inverter can be adjusted. For the switching element, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) can be used.

In recent years, the efficiency of inverters has been improved, but the conversion efficiency has not reached 100%, and conversion loss occurs. For example, when an inverter having a conversion efficiency of 95% is used, conversion power of 4 kW causes a conversion loss of 200 W. This is equivalent to a state where a 200 W lighting fixture is turned on, and becomes a large heat source. Further, the bidirectional DC-DC converter also uses a high-frequency switching element, and when the bidirectional DC-DC converter is used together, it also becomes a heat source. Thus, the largest heat source in the housing 10 of the power storage system 1 is the high frequency switching element in the power conversion unit 30.

A heat dissipation plate 21 is attached to the outer surface of the housing of the power storage unit 20, and a heat dissipation plate 31 is also attached to the outer surface of the housing of the power conversion unit 30. For the heat dissipation plates 21 and 31, for example, heat dissipation fins can be used. In this specification, a fan for cooling the power conversion unit 30 and/or the power storage unit 20 is not installed in the housing 10 of the power storage system 1. Since the fan is noisy, it impairs the quietness of the living space. The electricity storage system 1 in the present specification does not use a fan, and thus is a system with high noise reduction.

The heat in the housing 10 is radiated to the ceiling by natural convection. In the housing 10, a flow passage through which air can flow is secured from the second lower ventilation port 12c to the upper ventilation port 11b, and as shown in FIG. 3(b), from below the floor through the ventilation hole 4a. As a result, the air flows into the housing 10, the air rises in the housing 10, and escapes from the inside of the housing 10 to the back of the ceiling via the ventilation hole 2a. Further, the air that has flowed into the housing 10 from the room through the first lower ventilation ports 12a and 12b also rises in the housing 10 and escapes to the ceiling via the ventilation hole 2a.

The higher the temperature, the lower the density of air. As described above, the power conversion unit 30 is the largest heat source in the housing 10, and the heat generation of the power storage unit 20 is smaller than the heat generation of the power conversion unit 30. Therefore, the air density near the power conversion unit 30 becomes lower than the air density near the power storage unit 20, and buoyancy is generated in the air near the power storage unit 20. Due to this buoyancy, an ascending airflow is easily generated in the housing 10.

FIG. 4 is a perspective view showing an external configuration (before installation) of the power storage system 1 according to the second embodiment of the present invention. FIG. 5 is a perspective view showing an external configuration (after installation) of the power storage system 1 according to the second embodiment of the present invention. Example 2 Example 2 is an example of a power storage system 1 embedded in a wall. The wall-embedded power storage system 1 is mainly an installation method for a new house. Since the configuration of the power storage system 1 itself is the same as the configuration of the wall-front installation type power storage system 1 described in the first embodiment, the description thereof will be omitted. In the second embodiment, the mounting plate 6a is installed on the inner surface of the outer wall between the two columns 5c and 5d in the space between the inner wall and the outer wall in the building. The mounting plate 6b is installed on the floor of the space. As shown in FIG. 5, the wall-embedded power storage system 1 disappears from the living space after installation.

6A and 6B are side cross-sectional views of the power storage system 1 according to the second embodiment of the present invention. The mounting plate 6a is installed on the inner side surface of the outer wall 3b, and the mounting plate 6b is installed on the upper surface of the floor plate 4. The housing 10 of the power storage system 1 is fixed by two mounting plates 6a and 6b. As shown in FIG. 6B, air flows into the housing 10 from below the floor through the ventilation hole 4a and the first lower ventilation holes 12a and 12b, and the air inside the housing 10 rises, so that the inside of the housing 10 rises. Through the ventilation hole 2a to the back of the ceiling.

7A and 7B are diagrams showing a configuration example of the power conversion unit 30. FIG. 7A is a perspective view and FIG. 7B is a side sectional view. As shown in FIG. 7B, the power conversion unit 30 includes a board 33 on which a plurality of circuit components are mounted. The board 33 on which a plurality of circuit components are mounted is covered with the converter housing 32. A metal housing is used for the converter housing 32.

The heat-generating components (for example, switching elements) 34a and 34b that generate a large amount of heat in the circuit components are not directly mounted on the substrate 33, but the heat-conducting sheets 35a and 35b are provided on the raised portions of the conversion unit housing 32 that are raised from the substrate 33. Mounted via. The heat generating components 34a and 34b are connected to the printed wiring on the substrate 33 by wires.

The heat dissipation plate 31 is attached to the outside of the wide surface of the conversion unit housing 32 via the heat conduction sheet 35c. With this configuration, the heat generated in the heat generating components 34a and 34b is transmitted to the heat conduction sheets 35a and 35b, the conversion unit housing 32, the heat conduction sheet 35c, and the heat dissipation plate 31, and is radiated to the outside of the conversion unit housing 32. It Further, a wiring portion 36 is installed outside the side surface of the conversion unit housing 32, and is connected to the wiring portion 40 for external connection and the wiring portion of the power storage unit 20 by wiring. The converter housing 32 is fixed to the inner wall of the power storage system 1 housing 10 in a state in which a space through which air can flow is secured.

8A and 8B are diagrams showing a configuration example of the power storage unit 20. FIG. 8A is a perspective view and FIG. 8B is a side sectional view. As shown in FIG. 8B, in the power storage unit 20, a plurality of storage battery cells 24 are fixed to the storage battery holder 23 and housed in the power storage unit housing 22. The storage battery holder 23 is fixed to the inside of the wide surface of the power storage unit housing 22 via the heat conductive sheet 25.

The storage battery holder 23 is made of a material having high thermal conductivity, robustness, and insulation. For example, a resin material reinforced with carbon fiber can be used. A metal housing is used for the power storage unit housing 22. As the metal casing, one having a sufficient thickness to alleviate temperature variations of the plurality of storage battery cells 24 is used.

The heat dissipation plate 21 is attached to the outside of the wide surface of the power storage unit housing 22. With this configuration, the heat generated in the storage battery cell 24 is transmitted to the storage battery holder 23, the heat conductive sheet 25, the power storage unit housing 22, and the heat dissipation plate 21, and is released to the outside of the heat dissipation plate 21 to increase the temperature of the storage battery cell 24. Is alleviated. Wiring unit 26 is installed outside the side surface of power storage unit housing 22, and is connected to wiring unit 36 of power conversion unit 30 by wiring. The power storage unit housing 22 is fixed to the inner wall of the power storage system 1 housing 10 in a state where a space through which air can flow is secured.

9A to 9C are diagrams showing a configuration example of the storage battery holder 23. As shown in FIG. 9A, the storage battery holder 23 has a storage portion that stores a plurality of storage battery cells 24a-24j. In the example shown in FIG. 9A, ten cylindrical lithium ion battery cells are stored in parallel. The storage battery holder 23 is formed by a first holder portion 23a and a second holder portion 23b, and the first holder portion 23a and the second holder portion 23b are separated at half the position of the cylindrical storage portion, and each has a corrugated opening. Parts. The shape of the storage portion is not limited to the cylindrical shape, and may be a hexagonal lattice shape. The 1st holder part 23a and the 2nd holder part 23b are combined after accommodating a plurality of storage battery cells 24a-24j.

In the example shown in FIG. 9B, five storage battery cells 24a-24j connected in parallel are connected in series. The parallel connection increases the battery capacity, and the serial connection increases the voltage. The positive electrodes of the plurality of storage battery cells 24a-24j are connected by the positive electrode bus bar, and the negative electrodes of the plurality of storage battery cells 24a-24j are connected by the negative electrode bus bar. The positive electrode bus bar and the negative electrode bus bar that are adjacent to each other are connected by a connection bus bar. The bus bar functions as the power line 28a and is connected to the power terminal 28c. The start end of the voltage detection line 28b is connected to each node of the storage battery cells 24a-24j, and the end of the voltage detection line 28b is connected to the monitoring unit 29. The voltage detection line 28b outputs the voltage of each storage battery cell 24a-j to the monitoring unit 29. The monitoring unit 29 is composed of, for example, a microcontroller.

Storage battery temperature sensors 27a, 27b, and 27c for detecting the temperature of the storage battery cell 24 are installed at a plurality of locations. For example, the first storage battery temperature sensor 27a is installed at a position for detecting the temperature of the uppermost storage battery cell 24 in the series stage, and the second storage battery temperature sensor 27b detects the temperature of the middle storage battery cell 24 in the series stage. The third storage battery temperature sensor 27c is installed at a position for detecting, and the third storage battery temperature sensor 27c is installed at a position for detecting the temperature of the storage battery cell 24 at the bottom of the series. The storage battery temperature sensors 27a, 27b, 27c output the respective detected values to the monitoring unit 29.

In the storage battery cells 24 connected in multiple series, the temperature of the storage battery cells 24 connected in the middle stage is usually the highest, and the temperature decreases as they approach both ends (uppermost and lowermost). The lithium ion storage battery deteriorates more as it is charged and discharged at a higher temperature. From the viewpoint of aligning the lifespan of the plurality of storage battery cells 24 and extending the lifespan of the entire power storage unit 20, it is preferable that the temperatures of the storage battery cells 24 that are connected in a multi-series and multi-series manner be managed so as to be as uniform as possible. .. The use of a material having a high thermal conductivity for the storage battery holder 23 and the use of a thick metal plate for the power storage unit housing 22 contributes to equalizing the temperatures of the storage battery cells 24 connected in multiple series.

The monitoring unit 29 is connected to the control unit in the power conversion unit 30 by a communication line via the communication terminal 28d. The monitoring unit 29 notifies the control unit of the power conversion unit 30 of the voltage, current, and temperature of the storage battery cells 24 periodically or in response to a request from the control unit of the power conversion unit 30.

FIGS. 10A and 10B show a power storage system 1 using the power conversion unit 30 shown in FIGS. 7A and 7B and the power storage unit 20 shown in FIGS. 8A and 8B. It is a perspective view which shows the structure of. In the configuration example shown in FIGS. 10A and 10B, the housing 10 of the power storage system 1 is composed of a main body portion 10b and a lid portion 10a, and the lid portion 10a is screwed and fixed to the main body portion 10b. The blindfold plate 13 is also screwed and fixed at a predetermined position.

FIG. 11 is a diagram illustrating a circuit configuration example of the power storage system 1. As described above, the power storage system 1 includes the power storage unit 20 and the power conversion unit 30. Power storage unit 20 includes a storage battery cell 24 and a monitoring unit 29. The power conversion unit 30 includes a bidirectional DC-DC converter 301, a bidirectional inverter 302, and a control unit 303.

The monitoring unit 29 acquires the voltage, current, and temperature of the storage battery cell 24 and notifies the control unit 303 via the communication line. The bidirectional DC-DC converter 301 converts DC power discharged from the storage battery cells 24 into DC power of another voltage, and outputs the DC power to the DC bus 104. Further, the bidirectional DC-DC converter 301 converts the DC power input from the DC bus 304 into DC power of another voltage, and charges the storage battery cell 24.

The bidirectional inverter 302 converts the DC power input from the DC bus 304 into AC power and outputs the AC power to a distribution line (indoor wiring 7) connected to the grid 9a. A general load 9b operating with AC power is connected to the distribution line. The bidirectional inverter 302 also converts the AC power input from the grid 9a into DC power and outputs the DC power to the DC bus 304.

The control unit 303 controls the bidirectional DC-DC converter 301 and the bidirectional inverter 302. The configuration of the control unit 303 can be realized by cooperation of hardware resources and software resources, or only by hardware resources. As hardware resources, analog elements, microcomputers, DSPs, ROMs, RAMs, FPGAs, and other LSIs can be used. A program such as firmware can be used as a software resource.

The control unit 303 controls a switching element included in the bidirectional DC-DC converter 301 based on a command value for charging/discharging the storage battery cell 24 with constant current (CC) or charging/discharging with constant voltage (CV). A drive signal (for example, a PWM signal) for driving is generated, and the bidirectional DC-DC converter 301 is driven.

The control unit 303 also drives a switching element included in the bidirectional inverter 302 based on a command value for balancing the electric power on the input side of the bidirectional inverter 302 and the electric power on the output side. For example, a PWM signal) is generated to drive the bidirectional inverter 302.

The above configuration is the basic configuration. FIG. 11 shows a circuit configuration in which the photovoltaic power generation system is linked to the basic configuration. The step-up chopper 8b performs MPPT (Maximum Power Point Tracking) control so that the power generated by the solar cell 8a reaches the maximum power point (optimum operating point). Specifically, the operating point voltage is changed in a predetermined step width according to the hill climbing method to search for the maximum power point, and the output power of the solar cell 8a is controlled so as to maintain the maximum power point.

The output of the boost chopper 8b is connected to the DC bus 304 of the power conversion unit 30 via the indoor wiring 7. As a result, the storage battery cell 24 can be charged with the DC power generated by the solar cell 8a. In addition, the DC power generated by the solar cell 8a is converted into AC power by the bidirectional inverter 302 and supplied to the grid 9a or the load 9b. Although the example in which the photovoltaic power generation system is linked with the power storage system 1 has been described with reference to FIG. 11, the fuel cell system may be linked with the power storage system 1.

FIG. 12 is a perspective view showing an external configuration of the power storage system 1 according to the third embodiment of the present invention. FIG. 13 is a perspective view showing the internal configuration of the power storage system 1 according to the third embodiment of the present invention. In Examples 1 and 2, the installation example in which the indoor wiring 7 is passed through the upper ventilation holes 11a and 11b formed in the upper part of the housing 10 of the power storage system 1 has been shown. In the third embodiment, wiring holes 16a and 16b are provided on the top of the housing 10 in addition to the upper ventilation holes 11a and 11b.

In the example shown in FIG. 12, the indoor wiring 7 is connected to the terminal of the wiring section 40 through the wiring port 16a. In the third embodiment, an openable and closable upper vent 11c is installed in place of the upper vents 11a and 11b. For example, an electric louver is installed at the opening of the ventilation port. Further, a flip-up type or a slide type electric door may be installed at the opening of the vent hole. The openable upper vent 11c is electronically controlled by the control unit 303. In addition, it is preferable to install a net at the opening of the vent to prevent insects from entering.

In the third embodiment, ceiling temperature sensors 17a and 17b for measuring the temperature of the ceiling are installed near the openable upper vent 11c on the top of the housing 10. The above-ceiling temperature sensors 17a and 17b output the detected temperature to the control unit 303.

In the third embodiment, an openable and closable lower vent 12d is installed on the bottom surface of the housing 10 instead of the first lower vents 12a and 12b and the second lower vent 12c. Like the openable upper vent 11c, an electric louver or a flip-up or slide electric door is installed at the opening of the vent. The openable lower vent 12d is also electronically controlled by the control unit 303. Underfloor temperature sensors 18a and 18b for measuring the temperature under the floor are installed in the vicinity of the opening/closing lower vent 12d. The underfloor temperature sensors 18a and 18b output the detected temperature to the control unit 303.

The control unit 303 is detected by the temperatures of the storage battery cells 24 detected by the storage battery temperature sensors 27a, 27b, 27c, the temperatures above the ceiling detected by the ceiling temperature sensors 17a, 17b, and the underfloor temperature sensors 18a, 18b. The opening/closing of the openable upper vent 11c and the openable lower vent 12d is controlled based on the temperature under the floor.

The control unit 303 controls opening and closing of the openable upper vent 11c and the openable lower vent 12d so that the temperature of the storage battery cells 24 falls within a predetermined range. For example, the predetermined range is set to 0°C to 45°C and 5°C to 30°C. The risk of internal short circuit increases when the lithium ion storage battery is charged at 0°C or lower. Also, charging and discharging at high temperature accelerates the deterioration. Considering protection of the lithium ion storage battery, it is preferable to maintain the temperature of the storage battery cell 24 at 5° C. or higher, as close to 5° C. as possible.

Further, when the temperature detected by the outside air temperature sensor (not shown) installed outside the building is 30° C. or higher, the control unit 303 opens the openable upper vent 11c and the openable lower vent 12d, The outside air is attached to the inside of the housing 10. The temperatures of the power conversion unit 30 and the power storage unit 20 are equal to the temperature inside the wall even when the power storage system 1 is on standby, and are higher than the temperature inside the wall during operation. The power conversion unit 30 and the power storage unit 20 are cooled by opening the openable upper vent 11c and the openable lower vent 12d to attach outside air.

When the temperature detected by the outside air temperature sensor is 0° C. or lower, the control unit 303 closes the openable-closed upper vent 11c and the openable-closed lower vent 12d to shut off the open air flowing into the housing 10. As a result, the power conversion unit 30 and the power storage unit 20 are kept warm.

When the temperature detected by the outside air temperature sensor is 1 to 29° C., the control unit 303 controls the opening/closing upper vent 11 c and the opening/closing upper vent 11 c so as to reduce the battery temperature as much as possible within a range in which the temperature of the storage battery cell 24 does not fall below 5° C. The lower opening 12d is controlled to open and close. From the relationship between the detected temperature of the storage battery cell 24 and the detected temperatures of the ceiling and the underfloor, the control unit 303 opens the openable upper vent 11c and the openable lower vent 12d of the storage battery cell 24. It is determined whether the temperature is lower or the temperature is lower when it is closed, and the opening/closing upper vent 11c and the opening/closing lower vent 12d are opened/closed.

FIG. 14 is a perspective view showing an external configuration (before slide adjustment) of the power storage system 1 according to the fourth embodiment of the present invention. FIG. 15 is a perspective view showing an external configuration (after slide adjustment) of the power storage system 1 according to the fourth embodiment of the present invention. In the fourth embodiment, a height adjusting unit 19 for adjusting the height of the housing 10 is provided above the housing 10 of the power storage system 1. The height adjusting unit 19 is configured to be slidable up and down within a predetermined range, and is fixed in a state where the height adjusting unit 19 is in contact with the ceiling plate 2. For example, a support member may be attached to the gap generated by the sliding of the height adjusting unit 19.

In the example shown in FIG. 14, the wiring ports 16a and 16b are installed on the top surface of the housing 10 as described in the third embodiment. In the ceiling plate 2, wiring holes 2b and 2c are formed at positions corresponding to the wiring openings 16a and 16b installed on the top surface. These wiring holes 2b and 2c are preliminarily opened by an operator before installing the power storage system 1.

It is difficult to carry in and install the power storage system 1 in which the height of the housing 10 matches the height between the floor plate 4 and the ceiling plate 2 in the existing house. On the other hand, in the fourth embodiment, the housing 10 is laid sideways in a state where the height of the housing 10 is shorter than the height between the floor board 4 and the ceiling board 2, and the housing of the power storage system 1 is placed in front of the wall to be installed. 10 can be raised vertically. This vertical work is extremely difficult when the height of the housing 10 and the height between the floor plate 4 and the ceiling plate 2 are the same. In this respect, in the fourth embodiment, the work of vertically raising the housing 10 becomes easy. After vertically raising, the height adjusting unit 19 is slid and fixed to the ceiling plate 2, and the physical installation work is completed.

FIG. 16 is a perspective view showing the external configuration of the power storage system 1 according to the fifth embodiment of the present invention. FIG. 16A shows a wall-embedded power storage system 1 according to the fifth embodiment, and FIG. 16B shows a front wall-mounted power storage system 1 according to the fifth embodiment. In the fifth embodiment, the AC outlets 37a and 37b are installed on the front surface of the housing 10. The AC outlets 37a and 37b are outlets that can supply an AC voltage of 100V/200V, and the user can use the electric device by inserting the AC plug of the electric device at the time of power failure. In the fifth embodiment, a self-sustaining output terminal connected to the AC outlets 37a and 37b is added to the AC side of the bidirectional inverter 302 in FIG. During a power failure of the system 9a, the bidirectional inverter 302 outputs AC power to the self-sustained output terminal. A DC outlet (not shown) may be installed on the front surface of the housing 10. The DC outlet is, for example, a USB outlet and supplies a DC voltage of 5V/12V.

Furthermore, in the fifth embodiment, the display unit 50 may be provided on the front surface of the housing 10. The display unit 50 displays the remaining capacity of the power conversion unit 30. Further, when the solar power generation system and/or the fuel cell system is linked, the power generation amount of the solar cell and/or the fuel cell may be displayed.

As described above, according to the present embodiment, the power storage system 1 is configured by the vertically long and thin housing 10 and is installed in front of or in the wall, so that the adverse effect on the living space can be almost eliminated. When installed inside a wall, the living space does not shrink. Even when installed in front of a wall, the vertically long and thin casing 10 can minimize the reduction of the living space. Since no fan is used, almost no noise is generated. Further, since the power conversion unit 30 and the power storage unit 20 are covered with the metal casing, heat radiation to the living space basically does not occur.

Further, as compared with the case where the battery is installed outdoors, the temperature of the power storage unit 20 is basically unlikely to be high and low, and the life of the battery can be expected to be extended. Further, as compared with the case where it is installed outdoors, it is possible to suppress the measures for waterproofing, dustproofing, etc. to be inexpensive. Further, when it is installed in a wall, since it is not exposed, the surface painting and printing can be suppressed to be inexpensive.

Further, by providing the upper vent 11 and the lower vent 12, it is possible to ventilate the inside of the housing 10 from under the floor to above the ceiling. Further, by disposing power conversion unit 30 above power storage unit 20 in housing 10, air convection easily occurs in housing 10. Therefore, the storage battery cell 24 can be cooled. Further, by configuring the upper vent 11 and the lower vent 12 to be openable and closable, the vents can be closed as necessary, and the storage battery cells 24 can be kept warm. By these, power storage unit 20 can be protected.

The present invention has been described above based on the embodiment. It is understood by those skilled in the art that the embodiments are exemplifications, that various modifications can be made to the combinations of the respective constituent elements and the respective processing processes, and that the modifications are within the scope of the present invention. ..

For example, in the wall-front installation type power storage system 1, the first lower ventilation holes 12a and 12b installed at the lower part of the front surface of the housing 10 may be configured to be openable and closable. In the winter, when the temperature of the storage battery cell 24 is equal to or higher than the predetermined value, the control unit 303 may open the first lower ventilation holes 12a and 12b to supply warm air to the room.

Further, the power storage system 1 may be configured not to cooperate with the grid 9a. In that case, the power storage unit 20 charges the DC power generated by the solar cell 8a and directly supplies the DC load to the DC load via the USB terminal or the like.

The embodiment may be specified by the following items.

[Item 1]
A housing (10) sandwiched between the ceiling and floor of the building,
A power storage unit (20) arranged in the housing (10);
The DC power discharged from the power storage unit (20) is converted to AC power or another DC power and output to the outside, and the AC power or DC power input from the outside is converted to a predetermined DC power to store the power. A power conversion unit (30) for charging the unit (20),
Equipped with
The power conversion unit (30) is disposed above the power storage unit (20) in the housing (10),
A first vent hole (11) is formed on the top surface of the housing (10) for ventilating the ceiling above the building;
A second ventilation port (12) is formed on the bottom surface of the housing (10) for communicating with the underfloor of the building,
A power storage system (1) characterized by the above.
According to this, it is possible to construct the power storage system (1) in which the temperature of the power storage unit (20) is appropriately managed and the adverse effect on the living space is almost eliminated.
[Item 2]
The housing (10) is formed so as to have a small thickness in the direction perpendicular to the installation surface, and is installed on the inner surface of the outer wall of the building, the inner surface of the inner wall of the building, or the outer surface of the inner wall of the building. Attached to the mounting plate (6a),
The power storage system (1) according to Item 1, characterized in that.
The thickness in the direction perpendicular to the installation surface may be designed in the range of 100±40 mm, for example.
According to this, the electricity storage system (1) can be easily installed in front of or in the wall.
[Item 3]
Further comprising a wiring section (40) for connecting the power conversion section (30) and the indoor wiring (7) arranged in the ceiling.
The wiring part (40) is arranged above the power conversion part (30) in the housing (10),
Item 3. The power storage system (1) according to Item 1 or 2, which is characterized in that.
According to this, it becomes easy to connect the wiring of the power storage system (1) to the indoor wiring (7).
[Item 4]
The housing (10) has a height adjusting section (19) for adjusting the height,
Item 5. The power storage system (1) according to any one of Items 1 to 3, characterized in that.
According to this, it becomes easy to carry in and install the power storage system (1) in the house.
[Item 5]
Radiating plates (21, 31) are attached to the power storage unit (20) and the power conversion unit (30), respectively.
No fan is installed in the housing (10),
Item 5. The power storage system (1) according to any one of items 1 to 4, characterized in that.
According to this, the quietness can be maintained while protecting the power storage unit (20).
[Item 6]
The first vent (11c) has a first opening/closing mechanism that can be opened and closed,
The second vent hole (12d) has a second opening/closing mechanism that can be opened and closed.
A control unit (303) for controlling opening/closing of the first opening/closing mechanism and the second opening/closing mechanism so that the temperature of the power storage unit (20) falls within a predetermined range;
The power storage system (1) according to any one of Items 1 to 5, further comprising:
According to this, the temperature of the power storage unit (20) can be maintained within a predetermined range.

1 electricity storage system, 2 ceiling plate, 2a ventilation hole, 3a inner wall, 4 floor plate, 4a ventilation hole, 7 indoor wiring, 8a solar cell, 8b boosting chopper, 9a system, 9b load, 10 case, 11a, 11b upper ventilation port , 11c Retractable upper vent, 12a, 12b First lower vent, 12c Second lower vent, 12d Retractable lower vent, 13 Blind plate, 17a, 17b Ceiling temperature sensor, 18a, 18b Underfloor temperature sensor, 19 height adjusting part, 20 power storage part, 21 heat sink, 22 power storage part housing, 23 storage battery holder, 23a first holder part, 23b second holder part, 24 storage battery cell, 25 heat conduction sheet, 26 wiring part, 27a , 27b, 27c storage battery temperature sensor, 28a power line, 28b voltage detection line, 28c power terminal, 28d communication terminal, 29 monitoring unit, 30 power conversion unit, 301 bidirectional DC-DC converter, 302 bidirectional inverter, 303 control unit, 304 DC bus, 31 heat sink, 32 converter housing, 33 board, 34a, 34b heat generating component, 35a, 35b, 35b heat conductive sheet, 36, 40 wiring part, 41 wiring part cover, 50 display part, 6a mounting plate , 61 Hook.

Claims (5)

A housing sandwiched between the building's ceiling and floor,
A power storage unit disposed in the housing,
DC power discharged from the power storage unit is converted to AC power or another DC power and output to the outside, and AC power or DC power input from the outside is converted to predetermined DC power to charge the power storage unit. A power conversion unit that
Equipped with
The power conversion unit is disposed above the power storage unit in the housing,
A first vent hole is formed on the top surface of the housing for ventilating the space above the ceiling of the building,
A second ventilation hole is formed on the bottom surface of the housing for communicating with the underfloor of the building ,
A heat sink is attached to each of the power storage unit and the power conversion unit,
No fan is installed in the housing,
A power storage system characterized by the above. The housing is formed so that the thickness in the direction perpendicular to the installation surface is thin, and is attached to the inner surface of the outer wall of the building, the inner surface of the inner wall of the building, or the outer surface of the inner wall of the building. Attached to the
The power storage system according to claim 1, wherein: The power conversion unit, further comprising a wiring unit for connecting the indoor wiring arranged in the back of the ceiling,
The wiring section is disposed above the power conversion section in the housing,
The power storage system according to claim 1 or 2, wherein: The housing has a height adjusting unit for adjusting the height,
The power storage system according to any one of claims 1 to 3, wherein: The first vent has a first opening/closing mechanism that can be opened and closed,
The second vent has a second opening/closing mechanism that can be opened and closed,
A control unit that controls opening/closing of the first opening/closing mechanism and the second opening/closing mechanism so that the temperature of the power storage unit falls within a predetermined range;
The power storage system according to any one of claims 1 to 4 , further comprising: