Energy Storage System

Abstract

To provide a power storage system that can be used even in a state of being separated from a power conversion device for interconnecting with a system power supply.SOLUTION: A power storage system 1 performs input / output DC power from / to a power conversion device (power storage converter 103) of a power system 100 that interconnects a system power supply PS1 with a distributed power supply. The power storage system 1 comprises a storage battery 6, a control unit 9, a connection unit (connector 3), and output units (DC output unit 12, AC output unit 14). The storage battery 6 can store generation power generated by the distributed power supply. The control unit 9 controls charging / discharging of the storage battery 6. The connection unit connects the power storage system 1 with the power conversion device in a detachable / attachable manner. When external devices are connected in a state in which the power storage system 1 and the power conversion device are separated, the output units output stored power of the storage battery 6 to the external devices. The external devices differ from the power conversion device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure generally relates to a power storage system, and more particularly to a power storage system that inputs and outputs DC power to and from a power conversion device. [Background technology]

[0002] Patent Document 1 describes an electricity storage device in which a housing that houses a storage battery and a charging / discharging unit can be removed from a cabinet and moved. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-009584 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the power storage device of Patent Document 1, when using the power stored in the storage battery, it is necessary to connect a charge / discharge unit (power conversion device) for linking to a system power supply.

[0005] The present disclosure has been made in view of the above-mentioned circumstances, and has an object to provide a power storage system that can be used even in a state separated from a power conversion device for connecting to a grid power supply. [Means for solving the problem]

[0006] In order to solve the above problems, a power storage system according to an embodiment of the present disclosure is capable of inputting and outputting DC power between a power conversion device of a power system that connects a distributed power source to a grid power source, and is portable in a state separated from the power system. The power storage system includes a storage battery, a control unit, a connection unit, an output unit, and A housing andThe storage battery is capable of storing power generated by the distributed power source. The control unit controls charging and discharging of the storage battery. The connection unit detachably connects the power storage system and the power conversion device. When an external device is connected with the power storage system and the power conversion device separated, the output unit outputs the stored power of the storage battery to the external device. The external device is a device separate from the power conversion device. The housing accommodates the storage battery. The connection unit is configured to be able to output DC power to the power conversion device. The housing has an opening / closing unit that is configured to be openable and closable, and the opening / closing unit is closed when the power storage system is inputting / outputting DC power between the power storage system and the power conversion device. A power storage system according to an embodiment of the present disclosure inputs and outputs DC power between a power conversion device included in a power system that connects a distributed power source to a grid power source. The power storage system includes a storage battery, a control unit, a connection unit, an output unit, and Switch, The storage battery is capable of storing power generated by the distributed power source. The control unit controls charging and discharging of the storage battery. The connection unit detachably connects the power storage system and the power conversion device. When an external device is connected with the power storage system and the power conversion device separated, the output unit outputs the stored power of the storage battery to the external device. The external device is a device separate from the power conversion device. The switch is disposed between the connection portion and the storage battery. When the power storage system changes from a state in which the power storage system is connected to the power conversion device to a state in which the power storage system is separated from the power conversion device, By turning off the switch The charging and discharging operation of the storage battery is stopped. A power storage system according to one aspect of the present disclosure inputs and outputs DC power between a power conversion device included in a power system that connects a distributed power source to a grid power source. The power storage system includes a storage battery, a control unit, a connection unit, an output unit, and a housing. The storage battery is capable of storing power generated by the distributed power source. The control unit controls charging and discharging of the storage battery. The connection unit detachably connects the power storage system and the power conversion device. When an external device is connected with the power storage system and the power conversion device separated, the output unit outputs stored power of the storage battery to the external device. The external device is a device separate from the power conversion device. The housing accommodates the storage battery. The housing has an opening / closing unit configured to be openable and closable. The control unit stops charging and discharging operation of the storage battery when the opening / closing unit is opened. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a power storage system that can be used even when separated from a power conversion device for connecting to a grid power supply. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing the configuration of a power storage system and a power system according to the first embodiment. [Diagram 2] FIG. 2 is an external perspective view of the power storage system according to the above embodiment. [Diagram 3] FIG. 3 is a block diagram showing a configuration of a power storage system according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, elements common to each other are given the same reference numerals, and duplicated descriptions of the common elements will be omitted. The following embodiment is merely one of various embodiments of the present disclosure. Various modifications of the embodiment are possible depending on the design, etc., as long as the object of the present disclosure can be achieved. Each figure described in this disclosure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Note that the arrows indicating each direction are merely examples, and are not intended to define the direction when the power storage system 1 is used. Also, the arrows indicating each direction in the drawings are merely indicated for the purpose of explanation, and do not have any substance.

[0010] (Embodiment 1) (1) Overview First, an overview of a power storage system 1 according to this embodiment will be described with reference to FIG.

[0011] As shown in Fig. 1, the power storage system 1 of this embodiment is a system capable of inputting and outputting power by connecting to a power system 100. The power system 100 is a system capable of interconnecting a solar cell PV1 (distributed power source) with a system power source PS1 via a power conditioner 102. The power storage system 1 of this embodiment is electrically connectable to a power storage converter 103 (power conversion device) included in the power system 100, for example, via a power line W1 and a signal line W2. In the present disclosure, "electrically connected" means a connection in an electrically conductive state, and includes not only a direct connection, but also an indirect connection via, for example, a conductor such as an electric wire, a breaker, or a relay (connection device).

[0012] The power storage system 1 of this embodiment includes a connector 3 (connection unit), a storage battery 6, and a control unit 9 that controls charging and discharging of the storage battery 6. The connector 3 detachably connects the power storage system 1 including the storage battery 6 to a power storage converter 103. In other words, the power storage system 1 of this embodiment can be separated from the power system 100.

[0013] Here, when the facility in which the power storage system 1 is installed is flooded due to, for example, a flood or a high tide, if the power storage system 1 is submerged, the stored power of the power storage system 1 cannot be used. In particular, if the power storage system 1 is installed on the first floor of a facility, there is a high possibility that the power storage system 1 will be submerged. Also, in the event of a disaster, if one leaves the facility to evacuate to an evacuation shelter or the like, the stored power of the power storage system 1 installed in the facility cannot be used. Therefore, in this embodiment, the power storage system 1 is made movable (portable).

[0014] Furthermore, the energy storage system 1 of this embodiment includes output units (DC output unit 12, AC output unit 14) that output the stored power of the storage battery 6 to an external device (terminal 201, terminal 202) that is separate from the energy storage converter 103 when the external device is connected. Therefore, the energy storage system 1 of this embodiment can output the stored power of the storage battery 6 to the external device while separated from the energy storage converter 103. In other words, the energy storage system 1 of this embodiment can use the stored power of the energy storage system 1 at the destination, thereby further improving the convenience of the energy storage system 1. In the present disclosure, "separated" refers to a state in which the two systems are not connected either physically or electrically.

[0015] (2) Details Hereinafter, the configuration of the entire system including the power storage system 1 and the power system 100 according to this embodiment will be described in detail with reference to FIGS. 1 and 2. FIG.

[0016] (2.1) Overall System Configuration First, the details of the entire system will be described with reference to FIG.

[0017] The overall system is installed in a facility. In the present disclosure, the term "facility" includes residential facilities used for residential purposes, as well as non-residential facilities such as stores (tenants), offices, welfare facilities, educational facilities, hospitals, and factories. Non-residential facilities also include restaurants, amusement parks, hotels, inns, kindergartens, nurseries, and community centers. In other words, the facility may be a residential facility such as an apartment building, or a non-residential facility such as an office building. Furthermore, the facility also includes a facility in which residential facilities and non-residential facilities are mixed, for example, with stores on the lower floors and residences on the upper floors. In this embodiment, it is assumed that the facility is a detached house.

[0018] 1, the overall system includes a power storage system 1 and a power system 100. The overall system of this embodiment is a system in which the stored power of the storage battery 6 of the power storage system 1 can be used by the power system 100 etc. even in the case where the power supply from the power grid PS1 is stopped due to a disaster such as a typhoon or an earthquake.

[0019] (2.2) Power System Configuration Next, details of the power system 100 will be described with reference to FIG.

[0020] The power system 100 includes a distribution board 101, a power conditioner 102, a power storage converter 103, a controller 104, and a solar cell PV1.

[0021] A system power supply PS1 is connected to the primary side of the distribution board 101, and a power conditioner 102 is connected to the secondary side of the distribution board 101.

[0022] The power conditioner 102 has a function of converting AC power input from the system power supply PS1 into DC power and outputting it to the power storage converter 103. The power conditioner 102 also has a function of outputting DC power input from the solar cell PV1 to the power storage converter 103. The power conditioner 102 also has a function of converting DC power input from the solar cell PV1 or the power storage system 1 into AC power, and then causing it to flow reversely to the system power supply PS1 via the distribution board 101.

[0023] The power storage converter 103, for example, steps down the DC power input from the power conditioner 102 and outputs it to the power storage system 1. In addition, the power storage converter 103, for example, steps up the DC power input from the power storage system 1 and outputs it to the power conditioner 102.

[0024] The controller 104 is connected to the power conditioner 102. The controller 104 controls various functions of the power conditioner 102. The controller 104 can communicate with a home controller 204, a HEMS (Home Energy Management System) server 205, and the like, directly or indirectly via a network or a repeater, by an appropriate communication method such as wired communication or wireless communication.

[0025] Here, the home controller 204 is a so-called HEMS controller. The home controller 204 is a control device that controls HEMS-compatible devices (within the facility) that are connected to the power system 100. The HEMS-compatible devices include, for example, smart meters, solar power generation devices, power storage devices, fuel cells, electric vehicles, air conditioners, lighting equipment, hot water heaters, refrigerators, and television sets. Note that the HEMS-compatible devices are not limited to these devices.

[0026] Furthermore, the HEMS server 205 can store, for example, usage information of the HEMS compatible devices connected to the power system 100 and usage information of the power storage system 1. Furthermore, it is also possible for the HEMS server 205 to output, to the home controller 204, an instruction to control the HEMS compatible devices.

[0027] Although the power system 100 of this embodiment does not include the home controller 204 and the HEMS server 205 in its configuration, the power system 100 may include at least one of the home controller 204 and the HEMS server 205 in its configuration.

[0028] (2.3) Energy Storage System Next, details of the power storage system 1 of the present embodiment will be described with reference to FIGS.

[0029] As shown in FIG. 1, the energy storage system 1 includes a connector 3, a communication unit 4, a switch 5 (circuit breaker), a storage battery 6, a control unit 9, a DC conversion unit 11, a DC output unit 12, an AC conversion unit 13, and an AC output unit 14.

[0030] As described above, the connector 3 detachably connects the power storage system 1 including the connector 3 to the power storage converter 103. For example, when the connector 3 is connected to the power storage converter 103, the connector 3 is configured to be separated from the power storage converter 103 when a user presses a button on the connector 3 or operates a lever on the connector 3.

[0031] The communication unit 4 communicates with the power storage converter 103 via the connector 3 and the signal line W2. The communication unit 4 also communicates with the router 203 by an appropriate communication method such as wired communication or wireless communication. The communication unit 4 can communicate with the home controller 204 via the router 203. The communication unit 4 can also communicate with the HEMS server 205 via the router 203 and a network NW1 such as the Internet.

[0032] The switch 5 electrically connects the connector 3 and the storage battery 6 in response to control by the control unit 9. When the switch 5 is on (short circuited), the connector 3 and the storage battery 6 are electrically connected, and when the switch 5 is off (open), the connector 3 and the storage battery 6 are not electrically connected. Note that a signal line electrically connected to the signal line W2 and included in the power storage system 1 connects the connector 3 and the communication unit 4 without passing through the switch 5. This allows communication between the power storage system 1 and the power storage converter 103 to be performed even when the switch 5 is off.

[0033] The storage battery 6 is a storage battery capable of storing DC power output from the power system 100, such as power generated by the solar cell PV1. The storage battery 6 is, for example, a lithium ion battery or a nickel-metal hydride battery. The storage battery 6 can also be charged with DC power obtained by the power system 100 converting AC power supplied from the system power supply PS1.

[0034] The control unit 9 mainly comprises a computer system having one or more processors and one or more memories. The one or more processors execute a program recorded in the memory, thereby realizing the functions of the control unit 9. The program may be pre-recorded in the memory, may be provided via a telecommunication line such as the Internet, or may be provided by recording it on a non-transitory recording medium such as a memory card.

[0035] The control unit 9 controls the charging and discharging operation of the storage battery 6. The control unit 9 monitors whether the storage battery 6 is in a fully charged state by, for example, monitoring the voltage value of the storage battery 6. When the storage battery 6 is in a fully charged state, the control unit 9 performs control to stop charging the storage battery 6. When the storage battery 6 is charged with DC power input from the power storage converter 103, an instruction to stop the output of the power storage converter 103 is transmitted to the power storage converter 103 via the communication unit 4. When the storage battery 6 is charged with DC power output from a charging unit 16 described later, the control unit 9 performs control to stop the operation of the charging unit 16. When an external device such as a terminal 201 is connected to the DC output unit 12, the control unit 9 controls the discharge of the storage battery 6 by controlling the DC conversion unit 11. When an external device such as a terminal 202 is connected to the AC output unit 14, the control unit 9 controls the discharge of the storage battery 6 by controlling the AC conversion unit 13.

[0036] Furthermore, when the power storage system 1 is separated from the power storage converter 103, the control unit 9 stops the charging / discharging operation of the storage battery 6. When the power storage system 1 is separated from the power storage converter 103, the control unit 9 stops the charging / discharging operation of the storage battery 6 between the storage battery 6 and the power storage converter 103, for example, by turning off the switch 5, that is, by cutting off the electrical connection between the connector 3 and the storage battery 6.

[0037] Furthermore, the control unit 9 switches the operation when the power storage system 1 is separated from the power storage converter 103. When the power storage system 1 and the power storage converter 103 are connected, the control unit 9 communicates with the power system 100 (the power storage converter 103 or the power conditioner 102) and notifies the power system 100 of information related to the storage battery 6 to perform a linked operation with the power system 100. On the other hand, when the power storage system 1 and the power storage converter 103 (power system 100) are separated, the control unit 9 stops the linked operation with the power system 100 and performs an independent operation. In the independent operation, the control unit 9 performs, for example, control of the AC conversion unit 13 and the charging unit 16 described below.

[0038] Furthermore, when an opening / closing sensor 8 described later detects that an opening / closing unit 7 (see FIG. 2 ) described later is open, the control unit 9 transmits an instruction to stop input / output of the power storage converter 103 to the power storage converter 103 via the communication unit 4. In other words, when the opening / closing unit 7 is open, the control unit 9 transmits an instruction to the power system 100 via the communication unit 4 to end the cooperative operation with the power system 100. Then, the control unit 9 cuts off the electrical connection between the storage battery 6 and the power storage converter 103 by turning off the switch 5.

[0039] The DC converter 11 is a DC / DC converter that converts the power stored in the storage battery 6 into DC power of a predetermined voltage value. The predetermined voltage value is, for example, 5 volts, and the DC converter 11 of this embodiment steps down the power stored in the storage battery 6 to output DC power of 5 volts.

[0040] When a terminal 201 such as a smartphone or a tablet is connected, the DC output unit 12 outputs DC power converted by the DC conversion unit 11 to the terminal 201. The DC output unit 12 in this embodiment is a Universal Serial Bus (USB) port that outputs a DC voltage of 5 volts to the terminal 201.

[0041] The AC converter 13 is an inverter that converts the power stored in the storage battery 6 into AC power. The AC converter 13 of this embodiment outputs the power stored in the storage battery 6 as AC power with an amplitude of 100 volts and a frequency of 60 Hz or 50 Hz, for example.

[0042] When a terminal 202 such as a personal computer (PC) or a television is connected, the AC output unit 14 outputs the AC power converted by the AC conversion unit 13 to the terminal 202. The AC output unit 14 in this embodiment is an outlet that outputs AC power having an amplitude of 100 volts and a frequency of 60 Hz or 50 Hz to the terminal 202.

[0043] As shown in FIG. 1, the power storage system 1 of this embodiment further includes an input unit 15, a charging unit 16, a notification unit 17, and a display unit .

[0044] The input unit 15 receives an input of AC power output from the power source 200. The power source 200 is, for example, an AC power source that outputs AC power. The AC power source used in the power source 200 is, for example, a system power source PS1. The input unit 15 in this embodiment is, for example, a plug, and by being inserted into an outlet, AC power with an amplitude of, for example, 100 volts and a frequency of 60 Hz or 50 Hz is input. Note that the power source 200 is not limited to being an AC power source such as the system power source PS1, and may be a distributed power source. The distributed power source used in the power source 200 is, for example, a DC power source that outputs DC power, such as a solar cell PV1.

[0045] The charging unit 16 is an AC / DC converter that converts the AC power input to the input unit 15 into DC power and charges the storage battery 6 .

[0046] The notification unit 17 notifies information related to the storage battery 6. Here, the "information related to the storage battery 6" includes information on the remaining capacity (voltage value, amount of power) of the storage battery 6, information on whether the storage battery 6 is in a charging state, a discharging state, or a standby state, information on the charging power, and information on the discharging (output) power. The notification unit 17 of this embodiment notifies the home controller 204 of the information related to the storage battery 6 via the communication unit 4, thereby causing the display unit of the home controller to display the information related to the storage battery 6. The notification unit 17 also notifies the display unit 18 of the information related to the storage battery 6, thereby causing the display unit 18 to display the information related to the storage battery 6.

[0047] The display unit 18 is, for example, a touch panel display, and displays information about the storage battery 6 based on the notification by the notification unit 17.

[0048] The electricity storage system 1 of this embodiment includes a housing 2 and an open / close sensor 8. The housing 2 of this embodiment houses the connector 3, communication unit 4, switch 5, storage battery 6, open / close sensor 8, control unit 9, DC conversion unit 11, AC conversion unit 13, charging unit 16, and notification unit 17. The housing 2 is also equipped with the DC output unit 12, AC output unit 14, input unit 15, and display unit 18. The housing 2 of this embodiment is configured to allow each component of the electricity storage system 1 to be moved together when the connector 3 and the electricity storage converter 103 are separated from each other.

[0049] As shown in FIG. 2, the housing 2 of this embodiment has a rectangular parallelepiped shape. The housing 2 has an opening / closing section 7, an opening 19, and an internal space 20. In the following description, the direction in which the rear surface 23 and the front surface 21 are aligned is defined as the front-rear direction (first direction), the front surface 21 side as viewed from the rear surface 23 is defined as the front, and the rear surface 23 side as viewed from the front surface 21 is defined as the rear. In the following description, the direction in which the upper surface 22 and the lower surface 24 are aligned is defined as the up-down direction (second direction), the upper surface 22 side as viewed from the lower surface 24 is defined as the up, and the lower surface 24 side as viewed from the upper surface 22 is defined as the down. In addition, the direction in which the left surface 25 and the right surface 26 are aligned is defined as the left-right direction (third direction), the right surface 26 side as viewed from the left surface 25 is defined as the right, and the left surface 25 side as viewed from the right surface 26 is defined as the left. In addition, the front-rear direction, the up-down direction, and the left-right direction are perpendicular to each other.

[0050] The opening 19 is provided on the rear surface 23 of the housing 2, and is an opening for passing the power line W1 and the signal line W2 through the internal space 20.

[0051] The internal space 20 is an internal space of the housing 2, and is continuous with an external space of the housing 2 via an opening 19. The internal space 20 is, for example, a rectangular parallelepiped space. In the example of Fig. 2, the power line W1, the signal line W2, and the connector 3 exist in the internal space 20.

[0052] The opening / closing unit 7 is configured to be openable and closable, and is provided on the upper surface 22 of the housing 2. The upper surface 22 is a surface that intersects with the rear surface 23, and the upper surface 22 and the rear surface 23 of this embodiment are substantially perpendicular to each other. As shown in FIG. 2, the opening / closing unit 7 of this embodiment has a handle 71 that can be held by a user. When a user holds the handle 71 and lifts it upward, the opening / closing unit 7 of this embodiment is in an open state as shown in FIG. 2. The opening / closing unit 7 of this embodiment hides the connector 3 when in a closed state, and exposes the connector 3 to the external space of the housing 2 when in an open state. When the opening / closing unit 7 is closed, the connector 3 is accommodated in the internal space 20 while being covered by the housing 2 except for the opening 19. Moreover, the opening / closing unit 7 faces the connector 3 when in a closed state.

[0053] The open / close sensor 8 is a sensor that detects that the open / close unit 7 is open. The open / close sensor 8 is, for example, a magnetic sensor, an infrared sensor, or the like. When the open / close sensor 8 detects that the open / close unit 7 is open, it notifies the control unit 9 (see FIG. 1). As described above, upon receiving the notification from the open / close sensor 8, the control unit 9 transmits an instruction to the power storage converter 103 via the communication unit 4 to stop input / output of the power storage converter 103, and then turns off the switch 5.

[0054] 2, the DC output unit 12, the AC output unit 14, and the display unit 18 of this embodiment are provided on the front surface 21 of the housing 2. The front surface 21 is a surface facing the rear surface 23, and the front surface 21 of this embodiment is a surface parallel to the rear surface 23. The input unit 15 of this embodiment (see FIG. 1) is provided, for example, on the rear surface 23 side.

[0055] (3) Effects As described above, the power storage system 1 includes the storage battery 6, the control unit 9, the connector 3 (connection unit), and the output unit (DC output unit 12; AC output unit 14). The connector 3 detachably connects the power storage system 1 to the power storage converter 103 (power conversion device) of the power system 100 that interconnects the power grid power supply PS1 and the solar cell PV1 (distributed power supply). In addition, when the power storage system 1 and the power storage converter 103 are separated and an external device (terminal 201; terminal 202) that is a device other than the power storage converter 103 is connected, the DC output unit 12 and the AC output unit 14 output the stored power of the storage battery 6 to the terminal 201 or the terminal 202. Therefore, the power storage system 1 of this embodiment can output the stored power of the storage battery 6 to the terminal 201 or the terminal 202 even when separated from the power storage converter 103. The power storage system 1 of this embodiment can be separated from the power storage converter 103, for example, and moved to the second floor of a facility, an evacuation shelter, a campsite, or the like, and the stored power of the power storage system 1 can be used at the destination.

[0056] The power storage system 1 of this embodiment also includes an AC conversion unit 13 and an AC output unit 14. The AC conversion unit 13 converts the stored power of the storage battery 6 from DC power to AC power. The AC output unit 14 outputs the AC power converted by the AC conversion unit 13 to the terminal 202. Therefore, the power storage system 1 of this embodiment can output AC power to the terminal 202 even when separated from the power storage converter 103.

[0057] Moreover, the power storage system 1 of this embodiment includes a DC conversion unit 11 and a DC output unit 12 in addition to the AC conversion unit 13 and the AC output unit 14. The DC conversion unit 11 converts the stored power of the storage battery 6 into DC power of a predetermined voltage value (5 volts). The DC output unit 12 outputs the DC power converted by the DC conversion unit 11 to the terminal 201. Therefore, the power storage system 1 of this embodiment can output DC power to the terminal 201 even when separated from the power storage converter 103.

[0058] Furthermore, when the power storage system 1 changes from a state in which it is connected to the power storage converter 103 to a state in which it is separated from the power storage converter 103, the control unit 9 of this embodiment stops the charging / discharging operation of the storage battery 6 between the storage battery 6 and the power storage converter 103. When the power storage system 1 is separated from the power storage converter 103, the charging / discharging operation of the storage battery 6 stops, so that the user or the like does not need to perform an operation to stop the charging / discharging operation.

[0059] The power storage system 1 of this embodiment further includes a housing 2 having an opening / closing unit 7. When the opening / closing unit 7 is opened, the control unit 9 stops the charging / discharging operation of the storage battery 6 between the storage battery 6 and the power storage converter 103. When the opening / closing unit 7 is opened, the charging / discharging operation of the storage battery 6 is stopped, so that the power storage system 1 and the power storage converter 103 can be easily separated.

[0060] In addition, the opening / closing unit 7 of this embodiment hides the connector 3 (connection unit) when closed, and exposes the connector 3 when open. Since the connector 3 is exposed when the opening / closing unit 7 is opened, the power storage system 1 and the power storage converter 103 can be easily separated.

[0061] The power storage system 1 of this embodiment also includes an input unit 15 and a charging unit 16. The charging unit 16 converts AC power input to the input unit 15 into DC power and charges the storage battery 6. Therefore, the power storage system 1 can charge the storage battery 6 in a state separated from the power storage converter 103.

[0062] The power storage system 1 of the present embodiment also includes a notification unit 17. The notification unit 17 notifies information related to the storage battery 6. For example, the notification unit 17 of the present embodiment can cause the display unit of the home controller 204 to display the information related to the storage battery 6 by notifying the home controller 204 of the information related to the storage battery 6 via the communication unit 4. The user can check the information related to the storage battery 6 by looking at the display unit of the home controller 204.

[0063] The power storage system 1 of the present embodiment also includes a display unit 18. The display unit 18 displays information about the storage battery 6 based on a notification by the notification unit 17. A user can check the information about the storage battery 6 by looking at the display unit 18 of the power storage system 1.

[0064] Moreover, the power storage system 1 of this embodiment includes a connector 3 as a connection section. For example, the power storage system 1 and the power storage converter 103 can be more easily attached and detached from each other than when the power storage system 1 and the power storage converter 103 are connected to each other by connecting the power line W1 and the signal line W2 to a terminal block.

[0065] (Modification) The above embodiment is merely one of various embodiments of the present disclosure. The above embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

[0066] The power storage system 1 in the present disclosure includes, for example, a computer system. The computer system is mainly composed of a processor and a memory as hardware. The processor executes a program recorded in the memory of the computer system to realize the function of the power storage system 1 in the present disclosure. The program may be pre-recorded in the memory of the computer system, may be provided through an electric communication line, or may be provided by being recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits such as IC or LSI referred to here are called by different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, a field-programmable gate array (FPGA) that is programmed after the manufacture of the LSI, or a logic device that can reconfigure the connection relationship inside the LSI or the circuit partition inside the LSI, can also be adopted as a processor. The electronic circuits may be integrated in one chip or distributed among multiple chips. The chips may be integrated in one device or distributed among multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Thus, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0067] Modifications of the above embodiment are listed below. The modifications described below can be applied in appropriate combination.

[0068] It is not essential for the power storage system 1 that at least a portion of the functions of the power storage system 1 be concentrated in one device (housing 2), and the components of the power storage system 1 may be distributed and provided in a plurality of devices (housings). For example, some of the functions of the power storage system 1 (e.g., the control unit 9) may be provided in a housing other than the housing 2, and so on. At least a portion of the functions of the power storage system 1 may be realized by, for example, the cloud (cloud computing) or the like.

[0069] The power storage system 1 may include at least a connection unit (connector 3), a storage battery 6, a control unit 9, and an output unit (a DC output unit 12 or an AC output unit 14).

[0070] Instead of the connector 3, the power storage system 1 may include a connection section such as a terminal block to which the power line W1 and the signal line W2 are connected.

[0071] The notification unit 17 may output information about the storage battery 6 by outputting a sound from a speaker. The speaker may be a speaker included in the home controller 204 or a speaker included in the power storage system 1.

[0072] The electricity storage system 1 may include a breaker instead of the switch 5 as the interrupter.

[0073] The power system 100 may include distributed power sources such as hydroelectric power generation facilities, wind power generation facilities, biomass power generation facilities, and fuel cells instead of or in addition to the solar cell PV1.

[0074] The AC power output by the AC conversion unit 13 and the AC output unit 14 may be AC ​​power having an amplitude of 115 volts and a frequency of 60 Hz, AC power having an amplitude of 220 volts and a frequency of 50 Hz, or AC power having an amplitude of 230 volts and a frequency of 50 Hz.

[0075] Furthermore, the AC power received by input unit 15 may be AC ​​power with an amplitude of 115 volts and a frequency of 60 Hz, AC power with an amplitude of 220 volts and a frequency of 50 Hz, or AC power with an amplitude of 230 volts and a frequency of 50 Hz.

[0076] The power storage system 1 may have at least one of the DC output section 12 and the AC output section 14 in plural.

[0077] The power system 100 may have a power conversion device having the functions of the power conditioner 102 and the power storage converter 103, instead of the power conditioner 102 and the power storage converter 103. The power conversion device having the functions of the power conditioner 102 and the power storage converter 103 may be electrically connected to the power storage system 1.

[0078] The power storage system 1 and the power storage converter 103 may be configured as an integrated unit. Specifically, the power storage converter 103 may be directly connected to a connector 3 of the power storage system 1 without passing through a power line W1 and a signal line W2. Note that the connector 3 detachably connects the power storage system 1 and the power storage converter 103, as in the first embodiment.

[0079] The housing 2 may be provided with a handle on the top surface 22 of the housing 2 and / or with moving means such as casters on the bottom surface 24 of the housing 2 so that the user can easily move the housing 2 (power storage system 1).

[0080] When the opening / closing unit 7 is opened, the control unit 9 may turn off the switch 5 and transmit an instruction to end the cooperative operation with the power system 100 to the power system 100 side via the communication unit 4. Alternatively, instead of the control unit 9 outputting an instruction to end the cooperative operation with the power system 100, the switch 5 may output a contact signal to the power storage converter 103 in response to being turned off.

[0081] (Embodiment 2) (1) Overview The power storage system 1a of this embodiment shown in FIG. 3 is different from the power storage system 1 according to the first embodiment in that the DC conversion unit 11, the DC output unit 12, the AC conversion unit 13, the AC output unit 14, the input unit 15, and the charging unit 16 are separate from the connector 3, the storage battery 6, and the control unit 9. In the present disclosure, "separate" includes the first configuration and the second configuration being housed or provided in separate housings. For example, in the case where the housing housing the storage battery 6 and the housing housing the DC conversion unit 11 are separate housings, in the present disclosure, the storage battery 6 and the DC conversion unit 11 are said to be separate. Hereinafter, the same configurations as those in the first embodiment will be denoted by common reference numerals and will not be described as appropriate.

[0082] (2) Details 3, the power storage system 1a of the present embodiment includes a housing 2a and a housing 2b. The power storage system 1a of the present embodiment includes a connector 27, a connector 31, and a display unit 32 in addition to the components included in the power storage system 1 of the first embodiment.

[0083] The housing 2a accommodates a connector 3 (storage battery), a communication unit 4, a switch 5, a storage battery 6, an open / close sensor 8, a control unit 9, a notification unit 17, and a connector 27. A display unit 18 is provided on a front surface 21 (see FIG. 2) of the housing 2a. Note that the connector 3 detachably connects the power storage system 1a and the power system 100 (see FIG. 1) in the same manner as in the first embodiment.

[0084] The connector 27 is electrically connected to a connector 31 provided on the housing 2b.

[0085] The storage battery 6 of this embodiment performs charging and discharging operations via a connector 27 and a connector 31.

[0086] The control unit 9 in this embodiment controls the operations of the DC conversion unit 11, the AC conversion unit 13, and the charging unit 16 via the connector 27 and the connector 31.

[0087] The notification unit 17 of this embodiment causes the display unit 32 to display information about the storage battery 6 via the connector 27 and the connector 31.

[0088] The housing 2b integrally holds the connector 31, the DC conversion unit 11, the DC output unit 12, the AC conversion unit 13, the AC output unit 14, the input unit 15, the charging unit 16, and the display unit 32. For example, the housing 2b accommodates the DC conversion unit 11, the AC conversion unit 13, and the charging unit 16. In addition, for example, the connector 31, the DC output unit 12, the AC output unit 14, and the display unit 32 are provided on the surface of the housing 2b.

[0089] The DC converter 11 converts the stored power of the storage battery input via the connector 27 and the connector 31 into a DC voltage of a predetermined voltage value and outputs the DC voltage. The DC output unit 12 outputs the DC power input from the DC converter 11 to the terminal 201.

[0090] The AC conversion unit 13 converts the stored power of the storage battery input via the connector 27 and the connector 31 into AC power and outputs it. The AC output unit 14 outputs the AC power input from the AC conversion unit 13 to the terminal 202.

[0091] AC power is input to the input unit 15 from the power source 200. The charging unit 16 converts the AC power input from the input unit 15 into DC power, and charges the storage battery 6 via the connector 27 and the connector 31.

[0092] (3) Effects As described above, in the power storage system 1a of the present embodiment, the input unit 15 and the charging unit 16 are separate from the storage battery 6. For example, the storage battery 6, the input unit 15, and the charging unit 16 can be moved separately, and then the input unit 15 and the charging unit 16 can be attached to the storage battery 6 for use, thereby improving the convenience of the power storage system 1a.

[0093] Moreover, in the power storage system 1a of the present embodiment, the DC output unit 12 and the AC output unit 14 are separate from the storage battery 6. For example, the storage battery 6 and the DC output unit 12 and the AC output unit 14 can be moved separately, and then the DC output unit 12 and the AC output unit 14 can be attached to the storage battery 6 for use, thereby improving the convenience of the power storage system 1a.

[0094] (4) Variations The second embodiment is merely one of various embodiments of the present disclosure. The second embodiment can be modified in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.

[0095] It is not essential that the three pairs, namely, the pair of the DC conversion unit 11 and the DC output unit 12, the pair of the AC conversion unit 13 and the AC output unit 14, and the pair of the input unit 15 and the charging unit 16, are accommodated in the housing 2b. Any one of the three pairs, namely, the pair of the DC conversion unit 11 and the DC output unit 12, the pair of the AC conversion unit 13 and the AC output unit 14, and the pair of the input unit 15 and the charging unit 16, may be accommodated in the housing 2b. For example, the DC conversion unit 11 and the DC output unit 12 may be accommodated in a housing other than the housing 2a and the housing 2b. Also, for example, the AC conversion unit 13 and the AC output unit 14 may be accommodated in the housing 2a.

[0096] The power storage system 1a may not include the connector 27. The power storage system 1 may be configured such that the connector 3 and the connector 31 are electrically connected to each other, thereby electrically connecting the storage battery 6 and the control unit 9 to the DC conversion unit 11, the DC output unit 12, the AC conversion unit 13, the AC output unit 14, the input unit 15, and the charging unit 16.

[0097] Furthermore, the housing 2a of the power storage system 1a and the power storage converter 103 may be integrally configured. Specifically, the power storage converter 103 may be directly connected to a connector 3 provided in the housing 2a without passing through the power line W1 and the signal line W2. Note that the connector 3 detachably connects the housing 2a of the power storage system 1a and the power storage converter 103, as in the second embodiment.

[0098] The various configurations described in the second embodiment can be applied in appropriate combination with the first embodiment and the modified examples of the first embodiment.

[0099] (summary) As described above, the power storage system (1; 1a) according to the first embodiment inputs and outputs DC power between the power conversion device (power storage converter 103) included in the power system (100) that connects the distributed power source (solar cell PV1) to the grid power source (PS1). The power storage system (1, 1a) includes a storage battery (6), a control unit (9), a connection unit (connector 3), and an output unit (DC output unit 12; AC output unit 14). The storage battery (6) is capable of storing power generated by the distributed power source (solar cell PV1). The control unit (9) controls charging and discharging of the storage battery (6). The connection unit detachably connects the storage system (1; 1a) and the power conversion device. When an external device (terminal 201; terminal 202) is connected with the storage system (1) and the power conversion device separated from each other, the output unit outputs the stored power of the storage battery (6) to the external device. The external device is a device separate from the power conversion device.

[0100] According to this embodiment, the power storage system (1; 1a) can output the stored power of the storage battery (6) to an external device (terminal 201; terminal 202) in a state separated from the power conversion device (power storage converter 103).

[0101] The power storage system (1; 1a) according to the second aspect is the power storage system according to the first aspect, further including an AC conversion unit (13). The AC conversion unit (13) converts the stored power from DC power to AC power. The output unit (AC output unit 14) outputs the AC power converted by the AC conversion unit (13).

[0102] According to this embodiment, for example, the power storage system (1; 1a) can output AC power to an external device (terminal 202) in a state separated from the power conversion device (power storage converter 103).

[0103] The power storage system (1;1a) according to the third aspect is the same as that of the first aspect, but further includes a DC converter (11) and an AC converter (13). The DC converter (11) converts the stored power into DC power of a predetermined voltage value. The AC converter (13) converts the stored power from DC power to AC power. The power storage system (1;1a) has a DC output unit (12) and an AC output unit (14) as the output units. The DC output unit (12) outputs the DC power converted by the DC converter (11). The AC output unit (14) outputs the AC power converted by the AC converter (13).

[0104] According to this embodiment, for example, the power storage system (1; 1a) can output DC power and AC power to an external device (terminal 201; terminal 202) in a state separated from the power conversion device (power storage converter 103).

[0105] In the power storage system (1;1a) according to the fourth aspect, in any of the first to third aspects, the control unit (9) stops the charging / discharging operation of the storage battery (6) when the power storage system (1;1a) changes from a state in which it is connected to the power conversion device (power storage converter 103) to a state in which it is separated from the power conversion device.

[0106] According to this embodiment, when the power storage system (1; 1a) is separated from the power conversion device (power storage converter 103), the charging and discharging operation of the storage battery (6) is stopped, so that a user or the like does not need to perform any operation to stop the charging and discharging operation.

[0107] The power storage system (1;1a) according to a fifth aspect is the power storage system according to any one of the first to fourth aspects, further including a housing (2;2a). The housing (2;2a) houses a storage battery (6). The housing (2;2a) has an opening / closing part (7). The opening / closing part (7) is configured to be openable and closable. The control part (9) stops the charging / discharging operation of the storage battery (6) when the opening / closing part (7) is open.

[0108] According to this embodiment, when the opening / closing part (7) is opened, the charging / discharging operation of the storage battery (6) stops, so that the power storage system (1) and the power conversion device (power storage converter 103) can be easily separated.

[0109] In the electricity storage system (1;1a) according to the sixth aspect, in the fifth aspect, the opening / closing part (7) hides the connection part (connector 3) when in a closed state and exposes the connection part (connector 3) when in an open state.

[0110] According to this embodiment, when the opening / closing part (7) is opened, the connection part (connector 3) is exposed, so that the power storage system (1) and the power conversion device (power storage converter 103) can be easily separated.

[0111] The power storage system (1;1a) according to a seventh aspect is the power storage system according to any one of the first to sixth aspects, and further includes an input unit (15) and a charging unit (16). The input unit (15) receives AC power. The charging unit (16) converts the AC power input to the input unit (15) into DC power to charge the storage battery (6).

[0112] According to this embodiment, the power storage system (1; 1a) can charge the storage battery (6) in a state separated from the power conversion device (power storage converter 103) of the power system (100).

[0113] In the electricity storage system (1a) according to the eighth aspect, in the seventh aspect, the input unit (15) and the charging unit (16) are separate from the storage battery (6).

[0114] According to this embodiment, for example, the storage battery (6) and the input unit (15) and charging unit (16) can be moved separately, and then the input unit (15) and the charging unit (16) can be attached to the storage battery (6) for use, thereby improving convenience.

[0115] In the electricity storage system (1a) according to the ninth aspect, in any one of the first to eighth aspects, the output units (DC output unit 12; AC output unit 14) are separate from the storage battery (6).

[0116] According to this embodiment, for example, the storage battery (6) and the output units (DC output unit 12; AC output unit 14) can be moved separately, and then the output units (DC output unit 12; AC output unit 14) can be attached to the storage battery (6) for use, thereby improving convenience.

[0117] The power storage system (1; 1a) according to a tenth aspect is any one of the first to ninth aspects, further including a notification unit (17). The notification unit (17) notifies information related to the storage battery (6).

[0118] According to this embodiment, for example, information regarding the storage battery (6) can be notified to the home controller (204), so that the user can check the information regarding the storage battery (6) by looking at the display unit of the home controller (204).

[0119] The power storage system (1; 1a) according to an eleventh aspect is the power storage system (1; 1a) of the tenth aspect, further including a display unit (18). The display unit (18) displays information about the storage battery (6) based on notification by the notification unit (17).

[0120] According to this embodiment, the power storage system (1;1a) can display information about the storage battery (6), so that a user can check the information about the storage battery (6) by looking at the display unit (18) of the power storage system (1;1a).

[0121] In the electricity storage system (1; 1a) according to the twelfth aspect, in any one of the first to eleventh aspects, the connection portion is a connector (3).

[0122] According to this embodiment, the storage battery (6) and the power conversion device (power storage converter 103) can be attached and detached by the connector (3), so that the storage battery (6) and the power conversion device can be easily attached and detached.

[0123] The configurations other than those of the first embodiment are not essential to the power storage system and can be omitted as appropriate. [Explanation of symbols]

[0124] 1. Energy storage system 2,2a Case 3 Connector (Connection) 6. Storage battery 7 Opening and closing section 9. Control Unit 11 DC conversion section 12 DC output section (output section) 13 AC conversion section 14 AC output section (output section) 15 Input section 16 Live parts 17 Notification Department 18 Display 100 Power Systems 103 Storage converter (power conversion device) 201 Terminal (external device) 202 Terminal (external device) PS1 grid power supply PV1 Solar cell (distributed power supply)

Claims

1. A power storage system capable of inputting and outputting DC power between a power conversion device of a power system that connects a distributed power source to a grid power source, and capable of being carried in a state separated from the power system, a storage battery capable of storing power generated by the distributed power source; A control unit that controls charging and discharging of the storage battery; a connection section that detachably connects the power storage system and the power conversion device; an output unit that outputs the stored power of the storage battery to an external device that is a device other than the power conversion device when the power storage system and the power conversion device are separated from each other; A housing that houses the storage battery; Equipped with The connection unit is configured to be able to output DC power to the power conversion device, The housing has an opening / closing part configured to be openable and closable, When the power storage system is inputting / outputting DC power between the power storage system and the power conversion device, the opening / closing unit is closed. Energy storage system.

2. A power storage system that inputs and outputs DC power between a power conversion device of a power system that connects a distributed power source to a grid power source, a storage battery capable of storing power generated by the distributed power source; A control unit that controls charging and discharging of the storage battery; a connection section that detachably connects the power storage system and the power conversion device; an output unit that outputs the stored power of the storage battery to an external device that is a device other than the power conversion device when the power storage system and the power conversion device are separated from each other; A switch disposed between the connection portion and the storage battery; Equipped with the control unit, when the power storage system changes from a state in which the power storage system is connected to the power conversion device to a state in which the power storage system is separated from the power conversion device, stops a charging / discharging operation of the storage battery by turning off the switch. Energy storage system.

3. A power storage system that inputs and outputs DC power between a power conversion device of a power system that connects a distributed power source to a grid power source, a storage battery capable of storing power generated by the distributed power source; A control unit that controls charging and discharging of the storage battery; a connection section that detachably connects the power storage system and the power conversion device; an output unit that outputs the stored power of the storage battery to an external device that is a device other than the power conversion device when the power storage system and the power conversion device are separated from each other; A housing that houses the storage battery; Equipped with The housing has an opening / closing part configured to be openable and closable, The control unit stops a charging / discharging operation of the storage battery when the opening / closing unit is opened. Energy storage system.

4. an AC conversion unit that converts the stored power from DC power to AC power; Further comprising: The output unit outputs the AC power converted by the AC conversion unit. The power storage system according to claim 1 .

5. a DC converter that converts the stored power into DC power with a predetermined voltage value; an AC conversion unit that converts the stored power from DC power to AC power; Further comprising: The output unit includes a DC output unit and an AC output unit, The DC output unit outputs the DC power converted by the DC conversion unit, The AC output unit outputs the AC power converted by the AC conversion unit. The power storage system according to claim 1 .

6. The opening and closing portion hides the connection portion when in a closed state and exposes the connection portion when in an open state. The power storage system according to claim 3 .

7. An input unit that accepts an input of AC power; a charging unit that converts the AC power input to the input unit into DC power and charges the storage battery; Further comprising: The power storage system according to claim 1 .

8. The input unit and the charging unit are separate from the storage battery. The power storage system according to claim 7.

9. The output unit is separate from the storage battery. The power storage system according to claim 1 .

10. a notification unit that notifies information regarding the storage battery; Further comprising: The power storage system according to claim 1 .

11. a display unit that displays information about the storage battery based on the notification by the notification unit; Further comprising: The power storage system according to claim 10.

12. The connection portion is a connector. The power storage system according to claim 1 .

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