Charge / discharge system, control device, control method, and program

Abstract

To improve the usability of charge / discharge devices used to charge and discharge the batteries of mobile devices. [Solution] The charge / discharge system A1 comprises a charge / discharge device 1 and a control device 2. When a battery 101 is connected to the charge / discharge device 1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation if the amount of charge in the battery 101 is lower than a supplemental charge threshold set to a value lower than the discharge stop threshold. In the supplemental charge operation, the battery 101 is charged until the amount of charge in the battery 101 is equal to or greater than the supplemental charge threshold. When a battery 101 is connected to the charge / discharge device 1, the control device 2 enables the charge / discharge device 1 to perform a discharge operation to discharge the battery 101 if the amount of charge in the battery 101 is higher than the discharge stop threshold. If the amount of charge in the battery 101 falls below the discharge stop threshold during the discharge operation, the control device 2 causes the charge / discharge device 1 to stop the discharge operation.

Description

Technical Field

[0001] The present disclosure generally relates to a charge-discharge system, a control device, a control method, and a program. More specifically, the present disclosure relates to a charge-discharge system for charging and discharging a storage battery of a moving body, a control device, a control method of the control device, and a program.

Background Art

[0002] An example of the charge-discharge device (charge-discharge system) described in Patent Document 1 is given. An electric vehicle (moving body) has a storage battery and a vehicle control unit. The charge-discharge device described in Patent Document 1 is connected to the electric vehicle via a charge-discharge connector of a charge-discharge cable and charges and discharges the storage battery of the electric vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to provide a charge-discharge system, a control device, a control method, and a program capable of improving the usability of a charge-discharge device for charging and discharging a storage battery of a moving body.

Means for Solving the Problems

[0005] A charge-discharge system according to one aspect of the present disclosure comprises a charge-discharge device and a control device for controlling the charge-discharge device. The charge-discharge device exchanges power between the battery of a mobile body having a battery and at least one of a grid power source and a load. The control device sets a discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold with respect to the amount of charge of the battery connected to the charge-discharge device. When the battery is connected to the charge-discharge device, if the amount of charge of the battery is lower than the supplemental charge threshold, the control device causes the charge-discharge device to perform a supplemental charge operation to charge the battery until the amount of charge of the battery is equal to or greater than the supplemental charge threshold. When the battery is connected to the charge-discharge device, if the amount of charge of the battery is higher than the discharge stop threshold, the control device enables the charge-discharge device to perform a discharge operation to discharge the battery. When the amount of charge of the battery falls below the discharge stop threshold while the charge-discharge device is performing the discharge operation, the control device causes the charge-discharge device to stop the discharge operation.

[0006] A charge-discharge system in another aspect of the present disclosure comprises a charge-discharge device and a control device for controlling the charge-discharge device. The charge-discharge device exchanges power between the battery of a mobile body having a battery and at least one of a grid power supply and a load. The control device sets a discharge stop threshold for the amount of charge stored in the battery connected to the charge-discharge device. When the battery is connected to the charge-discharge device, if the amount of charge stored in the battery is higher than the discharge stop threshold, the control device enables the charge-discharge device to perform a discharge operation to discharge the battery. If the amount of charge stored in the battery falls below the discharge stop threshold while the charge-discharge device is performing the discharge operation, the control device causes the charge-discharge device to stop the discharge operation. The control device can switch the control mode of the charge-discharge device between a first mode and a second mode. In the first mode, when the battery is connected to the charge / discharge device, if the amount of charge in the battery is lower than the discharge stop threshold, the charge / discharge device is instructed to perform a supplemental charging operation to charge the battery until the amount of charge in the battery is equal to or greater than the discharge stop threshold. In the second mode, when the battery is connected to the charge / discharge device, even if the amount of charge in the battery is lower than the discharge stop threshold, the charge / discharge device is not instructed to perform the supplemental charging operation.

[0007] A control device according to one aspect of the present disclosure is capable of controlling a charge / discharge device. The charge / discharge device exchanges power between the battery of a mobile body having a battery and at least one of a grid power source and a load. The control device sets a discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold with respect to the amount of charge of the battery connected to the charge / discharge device. When the battery is connected to the charge / discharge device, if the amount of charge of the battery is lower than the supplemental charge threshold, the control device causes the charge / discharge device to perform a supplemental charge operation to charge the battery until the amount of charge of the battery is equal to or greater than the supplemental charge threshold. When the battery is connected to the charge / discharge device, if the amount of charge of the battery is higher than the discharge stop threshold, the control device enables the charge / discharge device to perform a discharge operation to discharge the battery. When the amount of charge of the battery falls below the discharge stop threshold while the charge / discharge device is performing the discharge operation, the control device causes the charge / discharge device to stop the discharge operation.

[0008] One aspect of the present disclosure is a control method performed by a control device capable of controlling a charge / discharge device. The charge / discharge device exchanges power between the battery of a mobile body having a battery and at least one of a grid power source and a load. In the control method, a discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold are set with respect to the amount of charge of the battery connected to the charge / discharge device. In the control method, when the battery is connected to the charge / discharge device, if the amount of charge of the battery is lower than the supplemental charge threshold, the charge / discharge device is made to perform a supplemental charge operation to charge the battery until the amount of charge of the battery is equal to or greater than the supplemental charge threshold. In the control method, when the battery is connected to the charge / discharge device, if the amount of charge of the battery is higher than the discharge stop threshold, the charge / discharge device is made to perform a discharge operation to discharge the battery. In the control method, if the amount of charge of the battery falls below the discharge stop threshold while the charge / discharge device is performing the discharge operation, the charge / discharge device is made to stop the discharge operation.

[0009] A program according to one aspect of this disclosure is a program that causes one or more processors to execute the control method. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a charge / discharge system, control device, control method, and program that can improve the usability of a charge / discharge device for charging and discharging batteries of mobile devices. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a block diagram of the charge / discharge system according to Embodiment 1. [Figure 2] Figure 2 is an explanatory diagram of the threshold values ​​that the control device of the charging and discharging system described above sets for the amount of charge stored in the mobile device's battery. [Figure 3] Figure 3 is a schematic diagram of the remote control for the charging and discharging system described above. [Figure 4] Figure 4 is a flowchart illustrating the operation of the charging and discharging system described above. [Figure 5] Figure 5 is an explanatory diagram of the threshold values ​​that the control device of the charge / discharge system according to Modified Example 1 and Modified Example 2 sets for the amount of charge stored in the battery of the mobile device. [Figure 6] Figure 6 is an explanatory diagram of the threshold values ​​that the control device of the charge / discharge system according to Modification 2, Modification 3, and Embodiment 2 sets for the amount of charge stored in the battery of the mobile device. [Figure 7] Figure 7 is an explanatory diagram of the threshold value that the control device of the charge / discharge system according to Modification 3 sets for the amount of charge stored in the mobile device's battery. [Figure 8] Figure 8 is a block diagram of the charge / discharge system according to Modification 4. [Modes for carrying out the invention]

[0012] The charge / discharge system according to the embodiments will be described below with reference to the drawings. Note that the configurations described in each embodiment below are merely examples of this disclosure. This disclosure is not limited to the embodiments below, and various modifications are possible depending on the design, etc., as long as the effects of this disclosure can be achieved.

[0013] (Embodiment 1) Hereinafter, the charge-discharge system A1 according to Embodiment 1 will be described with reference to FIGS. 1 and 2.

[0014] <Overview> FIG. 1 is a schematic system configuration diagram of the charge-discharge system A1 according to the present embodiment.

[0015] The charge-discharge system A1 includes, for example, a charge-discharge device 1 and a control device 2.

[0016] The charge-discharge device 1 exchanges electric power between the storage battery 一百〇一 of the moving body 100 having the storage battery 101 and at least one of the system power source 90 and the load 81.

[0017] The control device 2 of the present embodiment can control the charge-discharge device 1.

[0018] [[ID=二十五]]The control device 2 sets a discharge stop threshold B1 and a recharge threshold C1 lower than the discharge stop threshold B1 with respect to the stored amount of the storage battery 101 connected to the charge-discharge device 1 (see FIG. 2). When the storage battery 101 is connected to the charge-discharge device 1, if the stored amount of the storage battery 101 is lower than the recharge threshold C1, the control device 2 causes the charge-discharge device 1 to perform a recharge operation to charge the storage battery 101 until the stored amount of the storage battery 101 becomes not less than the recharge threshold C1. When the storage battery 101 is connected to the charge-discharge device 1, if the stored amount of the storage battery 101 is higher than the discharge stop threshold B1, the control device 2 enables the charge-discharge device 1 to perform a discharge operation to discharge from the storage battery 101. When the stored amount of the storage battery 101 becomes not more than the discharge stop threshold B1 during the discharge operation of the charge-discharge device 1, the control device 2 causes the charge-discharge device 1 to stop the discharge operation.

[0019] Here, the moving body 100 has a storage battery 101 for supplying power to the driving motor. The moving body 100 is an electric vehicle that travels by driving the driving motor with the power stored in the storage battery 101. The electric vehicle is, for example, a battery electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV).

[0020] The charging and discharging device 1 is installed, for example, in the parking space of the facility used by the user of the moving body 100. The facility used by the user is, for example, a building for residential use such as a single-family house or an apartment house. Note that the facility is not limited to a building for residential use, and may also be a non-residential building such as an office building, a commercial facility, a supermarket, a store, a school facility, or a hospital. The parking space is a parking space provided outside or inside the facility (for example, underground), and is a space for parking the moving body 100 charged by the charging and discharging system A1.

[0021] Note that there are multiple types of charging methods for the moving body 100, and the charging and discharging system A1 of the present embodiment adopts, for example, a charging method compliant with the CHAdeMO (registered trademark) standard. Further, the moving body 100 and the charging and discharging system A1 of the present embodiment correspond to a V2H (Vehicle to Home) system capable of supplying power from the storage battery 101 of the moving body 100 to the load 81 via the charging and discharging system A1. That is, the charging and discharging device 1 transferring power between the storage battery 101 of the moving body 100 and at least one of the utility power source 90 and the load 81 means that the charging and discharging device 1 performs at least one of the charging operation and the discharging operation of the storage battery 101. In the charging operation of the storage battery 101, the charging and discharging device 1 charges the storage battery 101 with the power supplied from the utility power source 90. Also, in the discharging operation of the storage battery 101, the charging and discharging device 1 supplies the power discharged from the storage battery 101 to at least one of the utility power source 90 and the load 81.

[0022] In this embodiment, the control device 2 sets a discharge stop threshold B1 and a supplemental charge threshold C1 based on the amount of charge stored in the battery 101. In addition to the discharge stop threshold B1 and the supplemental charge threshold C1, the control device 2 also sets a second discharge stop threshold B2 based on the amount of charge stored in the battery 101. Hereinafter, the discharge stop threshold B1 may be referred to as the first discharge stop threshold B1 in order to distinguish it from the second discharge stop threshold B2.

[0023] Furthermore, the battery 101 of the mobile unit 100 has a discharge limit threshold D1 set for each type of mobile unit 100. The control device 2 can obtain the discharge limit threshold D1 from the mobile unit 100 by communicating with the mobile unit 100. The discharge limit threshold D1 is, for example, a threshold set for each type of mobile unit 100. The discharge limit threshold D1 is set to, for example, the amount of stored energy required for the mobile unit 100 to perform a predetermined evacuation operation (for example, driving to the shoulder of the road) in an emergency. The control device 2 communicates with the mobile unit 100 using the communication line of the charge / discharge cable CB1 that connects the charge / discharge device 1 and the mobile unit 100.

[0024] The supplemental charge threshold C1 is set to the value obtained by adding the amount of stored energy P1 that you want to use to supply power from the battery 101 to the load 81, etc., in the event of a power outage of the grid power 90, to the discharge lower limit threshold D1. Here, a power outage of the grid power 90 refers to a state in which the power supply from the grid power 90 to the charge / discharge system A1 is stopped due to a break in the power supply path from the grid power 90 to the charge / discharge system A1. Conversely, a state in which the grid power 90 is not experiencing a power outage refers to a state in which power is being supplied from the grid power 90 to the charge / discharge system A1. Note that the supplemental charge operation is not performed when the grid power 90 is experiencing a power outage.

[0025] The first discharge stop threshold B1 is set to the value obtained by adding the stored energy P3 to the discharge lower limit threshold D1. The stored energy P3 is the sum of the stored energy P1 and stored energy P2. Stored energy P2 is the amount of stored energy that should be reserved for driving when supplying power from the battery 101 to the grid power 90 or load 81 during a non-power outage of the grid power 90 (grid-connected operation state).

[0026] The second discharge stop threshold B2 is set to the value obtained by adding the stored energy P4 to the discharge lower limit threshold D1. The stored energy P4 is the amount of energy that should be reserved for driving when supplying power from the battery 101 to loads 81, etc., during a power outage of grid power 90 (independent operation state). Here, the stored energy P4 is set to a value smaller than the stored energy P3. In other words, since the second discharge stop threshold B2 is set to a lower value than the first discharge stop threshold B1, the charge / discharge system A1 can utilize a larger amount of stored energy to supply power from the battery 101 to loads 81, etc., during a power outage.

[0027] In this embodiment, when the charge / discharge device 1 is performing a discharge operation to discharge the battery 101, if the amount of charge in the battery 101 falls below the discharge stop threshold B1, the control device 2 causes the charge / discharge device 1 to stop the discharge operation. Also, when the battery 101 is connected to the charge / discharge device 1, if the amount of charge in the battery 101 is lower than the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation to charge the battery 101 until the amount of charge in the battery 101 is equal to or greater than the supplemental charge threshold C1. Preferably, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation to charge the battery 101 until the amount of charge in the battery 101 is several percent (for example, about 2-5%) higher than the supplemental charge threshold C1. Here, since the supplemental charge threshold C1 is lower than the discharge stop threshold B1, when the battery 101 is connected to the charge / discharge device 1, if the amount of charge in the battery 101 is equal to or greater than the supplemental charge threshold C1, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the user of the mobile unit 100 can cause the charge / discharge device 1 to perform a charge operation of the battery 101 at a desired timing, thereby improving the usability of the charge / discharge device 1 for charging and discharging the battery 101 of the mobile unit 100. For example, the user can cause the charge / discharge device 1 to perform a supplemental charge operation of the battery 101 during off-peak hours when the unit price of electricity purchased from the grid power supply 90 is low. Also, when the charge / discharge device 1 is discharging from the battery 101, if the amount of charge in the battery 101 falls below the discharge stop threshold B1, the control device 2 causes the charge / discharge device 1 to stop the discharge operation. Therefore, the amount of charge stored in the battery 101 of the mobile unit 100 can be set to be greater than or equal to the discharge stop threshold B1, which is higher than the supplemental charge threshold C1, and the mobile unit 100 can retain the amount of charge necessary for driving.

[0028] Multiple mobile units 100 can be connected to the charge / discharge system A1. The control device 2 can obtain vehicle identification information assigned to each mobile unit 100 and the discharge lower threshold D1 from the mobile units 100 through communication with the mobile units 100. The control device 2 can store the first discharge stop threshold B1, second discharge stop threshold B2, and supplemental charge threshold C1 set for each of the multiple mobile units 100, along with the discharge lower threshold D1, in the memory of the control device 2, associating them with the vehicle identification information of the mobile unit 100. The control device 2 may obtain the set values ​​of the first discharge stop threshold B1, second discharge stop threshold B2, and supplemental charge threshold C1 from an external system, or the user may set them using the remote control 40 described later.

[0029] <Details> The charging and discharging system A1 according to this embodiment will be described below with reference to Figures 1 to 4.

[0030] (1) Charging and discharging system The charge / discharge system A1 includes, for example, a charge / discharge device 1, a control device 2, an energy storage device 10, a power device 20, a solar cell module 30, and a remote control 40, as shown in Figure 1.

[0031] The charge / discharge system A1 is electrically connected to, for example, the mobile unit 100 and charges the battery 101 of the mobile unit 100. The mobile unit 100 is, for example, an electric vehicle (e.g., an electric car) and has a battery 101. The battery 101 is, for example, a lithium-ion battery. The charge / discharge system A1 also discharges the battery 101 and supplies the power stored in the battery 101 to the energy storage device 10 and the loads 81 connected to the distribution board 80 described later. In Figure 1, one load 81 is connected to the distribution board 80, but multiple loads 81 may be connected to the distribution board 80. Note that the battery 101 is not limited to a lithium-ion battery, but may be, for example, a nickel-metal hydride battery, a lead-acid battery, etc.

[0032] (2) Each component of the charge / discharge system (2.1)Charge / discharge device The charge / discharge device 1 charges and discharges the battery 101 of the mobile unit 100. The charge / discharge device 1 is electrically connected to the battery 101. When the charge / discharge device 1 charges and discharges the battery 101, it means that the charge / discharge device 1 charges the battery 101 with power supplied from the grid power supply 90 or the solar cell module 30, and outputs the power discharged from the battery 101 to the grid power supply 90 or the load 81.

[0033] The charging / discharging device 1 is connected to the mobile body 100, for example, via a charging / discharging cable CB1. The mobile body 100 is provided with a first connector CN1, and a second connector CN2, provided on the charging / discharging cable CB1, is detachably connected to the first connector CN1. By connecting the second connector CN2 to the first connector CN1, the mobile body 100 and the charging / discharging device 1 are electrically connected via the charging / discharging cable CB1. The charging / discharging cable CB1 includes a power line for power supply and a communication line for communication.

[0034] Furthermore, the charging / discharging device 1 is electrically connected to the energy storage device 10 and the power supply device 20.

[0035] (2.2) Control device The control device 2 is implemented, for example, by a computer system having one or more processors and one or more memories. In other words, the functions of the control device 2 are realized by one or more processors executing a program stored in memory. The program may be pre-stored in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card. The control device 2 is electrically connected to the charge / discharge device 1, the power device 20, and the energy storage device 10. The control device 2 is also electrically connected to the mobile body 100. Note that the control device 2 is not limited to being implemented by a computer having one or more processors and one or more memories; for example, it may be implemented by a processor composed of multiple components, or it may be implemented by a single processor in combination with other functions and configurations.

[0036] The control device 2 controls, for example, the charge / discharge device 1. More specifically, the control device 2 controls the charge / discharge device 1 so that it charges and discharges the storage battery 101.

[0037] Furthermore, the control device 2 communicates with the mobile unit 100 via the communication line of the charge / discharge cable CB1. The control device 2 communicates with the mobile unit 100, for example, using CAN (Controller Area Network) communication. By communicating with the mobile unit 100 via CAN, the control device 2 obtains vehicle identification information and the discharge lower limit threshold D1 from the mobile unit 100.

[0038] Furthermore, the control device 2 transmits and receives signals containing information about processing to be performed with the mobile body 100, for example. The control device 2 also performs sequence processing with the mobile body 100. Sequence processing refers to a series of processes performed between the control device 2 and the mobile body 100, which includes a set of processes that define the order in which to start or stop the transfer of power between the mobile body 100 and the charge / discharge device 1.

[0039] The control device 2 controls the charge / discharge device 1 to charge and discharge the battery 101 after the transfer of power between the mobile body 100 and the charge / discharge device 1 has been permitted in the sequence processing.

[0040] Furthermore, the control device 2 communicates with the power supply unit 20. The control device 2 sends and receives signals containing information about the charge / discharge device 1 (e.g., setting information). The control device 2 also sends and receives signals to the remote control 40 via the power supply unit 20, containing setting information about thresholds such as the first discharge stop threshold B1, the second discharge stop threshold B2, and the supplemental charge threshold C1, or setting information about the control mode of the charge / discharge device 1. The control device 2 may also directly send and receive signals containing setting information about thresholds or control mode settings to the remote control 40.

[0041] Furthermore, the control device 2 controls, for example, the energy storage device 10. More specifically, the control device 2 controls, for example, the power conversion device 11 in the energy storage device 10, which will be described later. The control device 2 also controls the charge / discharge device 1 and the power conversion device 11 when power is exchanged between the battery 101 and the energy storage unit 12 in the energy storage device 10, which will be described later. In other words, the control device 2 controls the charge / discharge device 1 and the power conversion device 11 when charging and discharging are performed between the battery 101 and the energy storage unit 12.

[0042] The control device 2 operates on power supplied, for example, from the grid power supply 90 via the power switching unit 70 and the power device 20. Furthermore, when the mobile body 100 is connected to the charge / discharge device 1, and power transfer between the mobile body 100 and the charge / discharge device 1 is permitted in the sequence processing between the control device 2 and the mobile body 100, the control device 2 can operate on power supplied from the battery 101 of the mobile body 100. Therefore, if a power outage occurs in the grid power supply 90 after power transfer between the mobile body 100 and the charge / discharge device 1 has been permitted, the control device 2 will operate on power supplied from the battery 101 of the mobile body 100, for example.

[0043] (2.3) Energy storage devices The energy storage device 10 is a device that stores electricity generated by a power generation device (in the example in Figure 1, a solar cell module 30). The energy storage device 10 includes, for example, a power conversion device 11 and an energy storage unit 12. The energy storage unit 12 is, for example, a lithium-ion battery. However, the energy storage unit 12 is not limited to a lithium-ion battery, but may be, for example, a nickel-metal hydride battery, a lead-acid battery, etc.

[0044] The power converter 11 converts the first DC power into the second DC power. The power converter 11 converts the first DC power from at least one of the charge / discharge device 1 and the power device 20 into the second DC power and supplies the second DC power to the energy storage unit 12. The power converter 11 also converts the second DC power into the first DC power. The power converter 11 converts the second DC power from the energy storage unit 12 into the first DC power and supplies the first DC power to at least one of the charge / discharge device 1 and the power device 20. In short, the power converter 11 is a bidirectional converter (bidirectional DC-DC converter). The power converter 11 is electrically connected to the energy storage unit 12, the charge / discharge device 1 and the power device 20.

[0045] (2.4) Power equipment The power device 20 includes, for example, a first power converter 21, a second power converter 22, and a power control device 23.

[0046] The first power converter 21 converts the first DC power to the first AC power. The first power converter 21 converts the first DC power from at least one of the charge / discharge device 1 and the energy storage device 10 to the first AC power and supplies the first AC power to at least one of the distribution board 80 and the grid power supply 90. The first power converter 21 also converts the first AC power to the first DC power. The first power converter 21 converts the first AC power from at least one of the distribution board 80 and the grid power supply 90 to the first DC power and supplies the first DC power to at least one of the charge / discharge device 1 and the energy storage device 10. In short, the first power converter 21 is a bidirectional converter (bidirectional AC-DC converter). The first power converter 21 is electrically connected to the charge / discharge device 1, the power converter 11, and the second power converter 22. Furthermore, the first power converter 21 is electrically connected to the distribution board 80 via the power switching unit 70, which will be described later. Also, the first power converter 21 is electrically connected to the grid power supply 90 via the power switching unit 70.

[0047] The power switching unit 70 is a device that electrically connects the first power converter 21 to the distribution board 80 or the grid power supply 90. The power switching unit 70 switches to either a first connection state or a second connection state according to instructions from, for example, the power control device 23. The first connection state is the connection state when the power device 20 operates in conjunction with the grid power supply 90 (grid-connected operation), and in the first connection state, the distribution board 80 is connected to the circuit connecting the grid-connected input / output terminals of the first power converter 21 to the grid power supply 90. The second connection state is the connection state when the power device 20 operates independently, and in the second connection state, the output terminals on the independent operation side of the first power converter 21 are connected to the distribution board 80.

[0048] The distribution board 80 is electrically connected to the grid power supply 90 via the power switching unit 70. The distribution board 80 is also electrically connected to the first power converter 21 via the power switching unit 70. One or more loads 81 are connected to the distribution board 80. The loads 81 are, for example, electrical equipment such as lighting fixtures or air conditioning equipment, hot water supply equipment, outlets, wiring devices, etc. Wiring devices are, for example, wall switches.

[0049] The grid power supply 90 is, for example, a commercial power supply. The grid power supply 90 supplies second AC power to at least one of the power device 20 and the distribution board 80.

[0050] The second power converter 22 converts the third DC power to the first DC power. The second power converter 22 is a DC-DC converter. The second power converter 22 converts the third DC power from the solar cell module 30 to the first DC power and supplies the first DC power to at least one of the first power converter 21, the charge / discharge device 1, and the power converter 11. The second power converter 22 is electrically connected to the first power converter 21, the charge / discharge device 1, and the power converter 11. The second power converter 22 is also electrically connected to the solar cell module 30.

[0051] The power control device 23 is implemented, for example, by a computer system having one or more processors and one or more memories. In other words, the functions of the power control device 23 are realized by one or more processors executing a program stored in memory. The program may be pre-stored in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card. The power control device 23 is electrically connected to the first power converter 21 and the second power converter 22. The power control device 23 is also electrically connected to the remote control 40, the control device 2, and the power switching unit 70.

[0052] The power control device 23 controls, for example, the first power converter 21 and the second power converter 22. The power control device 23 also accepts operations from the remote control 40. For example, the power control device 23 accepts changes to the settings of the charge / discharge device 1 from the remote control 40. When the power control device 23 accepts a change to the settings of the charge / discharge device 1 (for example, a change to the threshold or control mode setting) from the remote control 40, it transmits a signal containing setting information related to the change to the settings of the charge / discharge device 1 to the control device 2. In addition to changes to the settings of the charge / discharge device 1 from the remote control 40, the power control device 23 also accepts changes to the settings of the charge / discharge system A1 from the remote control 40.

[0053] (2.5) Solar cell modules The solar cell module 30 includes, for example, multiple solar cells. These multiple solar cells generate electricity from sunlight. The multiple solar cells supply the generated electricity (third DC power) to the second power converter 22. In other words, the solar cell module 30 supplies third DC power to the second power converter 22. The solar cell module 30 is electrically connected to the second power converter 22. While the number of solar cells is shown as multiple, it may also be just one.

[0054] (2.6) Remote control The remote control 40 is configured to change the settings of the charge / discharge system A1, for example. As shown in Figure 2, the remote control 40 has a display unit 41, an operation unit 42, and a control unit. The remote control 40 also has a communication unit that can communicate with the power control device 23.

[0055] The display unit 41 is, for example, a display (e.g., a liquid crystal display). The display unit 41 is electrically connected to the control unit. The display unit 41 displays information from the control unit.

[0056] The operation unit 42 is configured to allow, for example, the modification of information (e.g., setting information) displayed on the display unit 41. The operation unit 42 is, for example, an operation button. The operation unit 42 is electrically connected to the control unit.

[0057] The control unit transmits, for example, a signal containing information regarding setting changes to the power control device 23. The control unit is implemented, for example, by a computer system having one or more processors and one or more memories. In other words, the functions of the control unit are realized by one or more processors executing a program stored in memory. The program may be pre-stored in memory, provided via a telecommunication line such as the Internet, or provided on a non-temporary recording medium such as a memory card.

[0058] Furthermore, the user can set threshold values ​​such as the first discharge stop threshold B1, the second discharge stop threshold B2, and the supplemental charge threshold C1, or the control mode of the charge / discharge device 1, by operating the remote control 40. When the user uses the operation unit 42 to set a threshold value or the control mode of the charge / discharge device 1, the control unit of the remote control 40 transmits a signal containing setting information regarding the threshold value or control mode setting to the control device 2 via the power supply unit 20.

[0059] (3) Operation of the charging and discharging system The operation of the charge / discharge system A1 will be explained based on the flowchart in Figure 4. Note that the flowchart in Figure 4 is merely one example of the operation of the charge / discharge system A1 according to this embodiment; the order of processing may be changed as appropriate, and processing may be added or omitted as appropriate.

[0060] When the user connects the second connector CN2 of the charge / discharge cable CB1 to the first connector CN1 of the mobile unit 100 (S1), the control device 2 performs sequence processing with the mobile unit 100 (S2).

[0061] When the control device 2 is permitted to exchange power between the mobile body 100 and the charge / discharge device 1 during sequence processing, it controls the charge / discharge device 1 to charge or discharge the storage battery 101.

[0062] The control device 2 obtains information from the power control device 23, for example, by communicating with the power control device 23, indicating whether the power device 20 is operating in grid-connected mode or in standalone mode. If the power device 20 is operating in grid-connected mode (S3: Yes), that is, the grid power supply 90 is not experiencing a power outage, the control device 2 proceeds to step S4. If the power device 20 is operating in standalone mode (S3: No), that is, the grid power supply 90 is experiencing a power outage, the control device 2 proceeds to step S10.

[0063] If the power device 20 is operating in grid-connected mode (S3: Yes), the control device 2 performs the process in step S4. In step S4, the control device 2 compares the current amount of charge E1 of the battery 101, obtained through communication with the mobile unit 100, with the supplemental charge threshold C1.

[0064] In step S4, if the amount of charge E1 in the battery 101 is lower than the supplemental charge threshold C1 (S4: No), the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation (S5). The arrow CG1 in Figure 2 indicates the state in which the amount of charge E1 increases to the supplemental charge threshold C1 due to the supplemental charge operation. When the charge / discharge device 1 performs a supplemental charge operation, the charge / discharge device 1 converts the voltage value of the DC power supplied from the power device 20 and charges the battery 101 with the converted DC power. Then, when the amount of charge E1 in the battery 101 becomes equal to or greater than the supplemental charge threshold C1, the control device 2 stops the supplemental charge operation of the charge / discharge device 1 and proceeds to step S6. In this way, when the mobile body 100 is connected to the charge / discharge device 1, if the amount of charge E1 in the battery 101 is lower than the supplemental charge threshold C1, the charge / discharge device 1 automatically charges the battery 101 until the amount of charge E1 becomes equal to or greater than the supplemental charge threshold C1. Therefore, the charge / discharge system A1 can ensure that the amount of charge E1 stored in the battery 101 is equal to or greater than the minimum required supplemental charge threshold C1.

[0065] Furthermore, if the amount of charge E1 of the battery 101 is equal to or greater than the supplemental charge threshold C1 in step S4 (S4: Yes), the control device 2 does not have the charge / discharge device 1 perform a supplemental charge operation and proceeds to step S6. In this way, if the amount of charge E1 of the battery 101 is equal to or greater than the supplemental charge threshold C1, the charge / discharge device 1 does not automatically perform a supplemental charge operation, and the user can have the charge / discharge device 1 perform a charge operation of the battery 101 at a desired timing. For example, if the user sets a charging time period for charging the battery 101 using the remote control 40, a signal containing setting information regarding the charging time period is transmitted from the remote control 40 to the control device 2 via the power supply 20. Based on the setting information regarding the charging time period received from the remote control 40 via the power supply 20, the control device 2 controls the charge / discharge device 1 to charge the battery 101 during the charging time period. For example, if the user operates the remote control 40 and sets a time period such as the late-night period when the unit price of electricity to be purchased is low as the charging time period, the charge / discharge device 1 can perform a charge operation during the time when the unit price of electricity is low. Furthermore, when charging the battery 101 during the charging period, the control device 2 causes the charge / discharge device 1 to charge the battery 101 until, for example, the amount of charge E1 in the battery 101 is equal to or greater than the first discharge stop threshold B1, thereby charging the amount of charge necessary for the mobile unit 100 to operate.

[0066] In step S6, the control device 2 monitors whether a signal including a discharge instruction is input from, for example, the remote control 40 via the power supply 20.

[0067] When a signal including a discharge instruction is input from the remote control 40 to the control device 2 via the power supply unit 20 (S6: Yes), the control device 2 compares the amount of charge E1 of the storage battery 101 with the first discharge stop threshold B1 (S7).

[0068] If, in step S7, the amount of stored energy E1 exceeds the first discharge stop threshold B1 (S7: No), the control device 2 controls the charge / discharge device 1 to perform a discharge operation from the battery 101 (S8). The arrow DC1 in Figure 2 indicates a state in which the amount of stored energy E1 decreases due to the discharge process. The charge / discharge device 1 performs a discharge operation to discharge from the battery 101 until the amount of stored energy E1 decreases to the first discharge stop threshold B1. At this time, the charge / discharge device 1 performs a voltage conversion of the DC power supplied from the battery 101 and outputs the converted DC power to the power device 20. The first power converter 21 of the power device 20 converts the first DC power supplied from the charge / discharge device 1 into first AC power and supplies the converted first AC power to the load 81 via the grid power supply 90 or the distribution board 80. When the amount of stored energy E1 of the battery 101 falls below the first discharge stop threshold B1, the charge / discharge device 1 stops the discharge operation from the battery 101. The discharge stop threshold B1 is set to the value obtained by adding the amount of stored energy P1 for supplying power to load 81 etc. during non-power outages and the amount of stored energy P2 to be reserved for the operation of the mobile unit 100 to the discharge lower threshold D1. Therefore, even after the discharge process in step S8 is performed, the battery 101 can retain the amount of stored energy P1 for power supply and the amount of stored energy P2 for operation.

[0069] Furthermore, if the stored energy E1 is less than or equal to the discharge stop threshold B1 in step S7 (S7: Yes), the control device 2 will not allow the charge / discharge device 1 to perform a discharge operation from the battery 101, thereby suppressing a decrease in the stored energy E1 of the battery 101.

[0070] On the other hand, if the power unit 20 is operating independently (S3: No), the control device 2 performs the process in step S10. In step S10, the control device 2 monitors whether a signal including a discharge instruction is input from, for example, the remote control 40 via the power unit 20.

[0071] For example, when a signal including a discharge instruction is input from the remote control 40 to the control device 2 via the power supply unit 20 (S10: Yes), the control device 2 compares the amount of charge E1 in the battery 101 with the second discharge stop threshold B2 (S11). In addition, even in the event of a power outage of the grid power supply 90, the power supply unit 20 and the remote control 40 can operate using power supplied from the energy storage unit 10 or the solar cell module 30, etc.

[0072] If, in step S11, the amount of stored energy E1 exceeds the second discharge stop threshold B2 (S11: No), the control device 2 controls the charge / discharge device 1 to perform a discharge operation from the battery 101 (S12). The arrow DC2 in Figure 2 indicates a state in which the amount of stored energy E1 decreases due to the discharge process. The charge / discharge device 1 performs a discharge operation to discharge from the battery 101 until the amount of stored energy E1 decreases to the second discharge stop threshold B2. At this time, the charge / discharge device 1 performs a voltage conversion of the DC power supplied from the battery 101 and outputs the converted DC power to the power device 20. The first power converter 21 of the power device 20 converts the first DC power supplied from the charge / discharge device 1 into first AC power and supplies the converted first AC power to the load 81 via the distribution board 80. When the amount of stored energy E1 of the battery 101 falls below the second discharge stop threshold B2, the charge / discharge device 1 stops the discharge operation from the battery 101. The second discharge stop threshold B2 is set to the value obtained by adding the amount of stored energy P4 that should be left for the mobile unit 100 to the discharge lower threshold D1. Therefore, even after the discharge process in step S12, the battery 101 can retain the amount of stored energy P4 for driving.

[0073] Furthermore, if the stored energy E1 is less than or equal to the second discharge stop threshold B2 in step S11 (S11: Yes), the control device 2 will not allow the charge / discharge device 1 to perform a discharge operation from the battery 101, thereby suppressing a decrease in the stored energy E1 of the battery 101.

[0074] In this embodiment, the control device 2 can switch the control mode of the charge / discharge device 1 between a first mode and a second mode. In the first mode, a supplemental charge operation is performed when the amount of charge E1 of the storage battery 101 is lower than the supplemental charge threshold C1. In the second mode, no supplemental charge operation is performed even if the amount of charge E1 of the storage battery 101 is lower than the supplemental charge threshold C1.

[0075] For example, the user can switch the control mode of the charge / discharge device 1 between the first mode and the second mode by operating the remote control 40. When the user uses the operation unit 42 of the remote control 40 to set the control mode of the charge / discharge device 1, the control unit of the remote control 40 transmits a signal containing setting information for setting the control mode of the charge / discharge device 1 to the control device 2 via the power supply unit 20. When the control device 2 receives the signal containing the setting information from the remote control 40 via the power supply unit 20, it sets the control mode of the charge / discharge device 1 to the control mode (first mode or second mode) according to the setting information.

[0076] When the control device 2 sets the control mode of the charge / discharge device 1 to the first mode, if the amount of charge E1 in the storage battery 101 is lower than the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation, so that the storage battery 101 can be charged up to the supplemental charge threshold C1.

[0077] On the other hand, if the control device 2 sets the control mode of the charge / discharge device 1 to the second mode, the control device 2 will not cause the charge / discharge device 1 to perform a supplemental charge operation even if the amount of charge E1 of the battery 101 is lower than the supplemental charge threshold C1. Therefore, the charge / discharge device 1 will not automatically perform a supplemental charge operation of the battery 101, and the user can cause the charge / discharge device 1 to perform a supplemental charge operation of the battery 101 at a desired timing.

[0078] The settings for the first discharge stop threshold B1, the second discharge stop threshold B2, and the supplemental charge threshold C1 are stored in the memory of the control device 2 in association with the vehicle identification information of the mobile unit 100. The control device 2 also communicates with the mobile unit 100 to store the discharge lower limit threshold D1 obtained from the mobile unit 100 in the memory of the control device 2 in association with the vehicle identification information of the mobile unit 100. The user can change the settings for the first discharge stop threshold B1, the second discharge stop threshold B2, and the supplemental charge threshold C1 by operating the operation unit 42 of the remote control 40, for example. In this embodiment, the control device 2 sets the second discharge stop threshold B2 based on the amount of charge stored in the battery 101, but setting the second discharge stop threshold B2 is not mandatory, and it can be omitted as appropriate. When the charge / discharge device 1 performs a discharge operation on the battery 101 in a self-contained operation state, with the control device 2 not having set the second discharge stop threshold B2, the control device 2 should stop the discharge operation on the charge / discharge device 1 when the amount of charge E1 in the battery 101 falls below the first discharge stop threshold B1. As a result, in the charge / discharge system A1 of this embodiment, even after the discharge process by the charge / discharge device 1 is completed, the possibility that the amount of charge in the battery 101 of the mobile unit 100 will fall below the first discharge stop threshold B1 can be reduced.

[0079] (4) Variations The above embodiments are merely one of many embodiments of this disclosure. The above embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. Furthermore, functions similar to those of the control device 2 provided in the charge / discharge system A1 may be embodied in a control method for the control device 2, a computer program, or a non-temporary recording medium on which the program is stored. One embodiment of the control method for the control device 2 is a control method for the control device 2 that can control a charge / discharge device 1 that exchanges power between the battery 101 of a mobile body 100 having a battery 101 and at least one of the grid power supply 90 and the load 81. In the control method for the control device 2, a discharge stop threshold B1 and a supplemental charge threshold C1 lower than the discharge stop threshold B1 are set with respect to the amount of charge stored in the battery 101 connected to the charge / discharge device 1. In the control method for the control device 2, when the battery 101 is connected to the charge / discharge device 1, if the amount of charge stored in the battery 101 is lower than the supplemental charge threshold C1, the charge / discharge device 1 is made to perform a supplemental charge operation. The supplemental charging operation is an operation to charge the battery 101 until the amount of charge in the battery 101 is equal to or greater than the supplemental charging threshold C1. In the control method of the control device 2, when the battery 101 is connected to the charge / discharge device 1, if the amount of charge in the battery 101 is higher than the discharge stop threshold B1, the charge / discharge device 1 is made to perform a discharge operation to discharge the battery 101. In the control method of the control device 2, if the amount of charge in the battery 101 falls below the discharge stop threshold B1 while the charge / discharge device 1 is performing a discharge operation, the charge / discharge device 1 is made to stop the discharge operation. A (computer) program according to one embodiment is a program that causes one or more processors to execute the control method of the control device 2.

[0080] The following lists some modifications of the above embodiment. The modifications described below can be combined and applied as appropriate. In the following description, the above embodiment may also be referred to as the basic example.

[0081] (4.1) Variation 1 The charge / discharge system A1 according to Modification 1 will be explained with reference to Figure 5.

[0082] The charge / discharge system A1 according to Modified Example 1 differs from the basic example in that the control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1. Note that the charge / discharge system A1 according to Modified Example 1 has the same configuration as the basic example except for the fact that the control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1. Therefore, the same reference numerals are used for components common to both the basic example and the basic example, and their explanations are omitted.

[0083] In the charge / discharge system A1 according to Modification 1, similar to the basic example, the control device 2 sets a second discharge stop threshold B2 in addition to the first discharge stop threshold B1 when the grid power supply 90 is not interrupted, for use during a power outage of the grid power supply 90. The second discharge stop threshold B2 is lower than the first discharge stop threshold B1. When the grid power supply 90 is interrupted, if the amount of charge stored in the battery 101 falls below the second discharge stop threshold B2 while the charge / discharge device 1 is performing a discharge operation, the control device 2 causes the charge / discharge device 1 to stop the discharge operation. The control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1. The control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1.

[0084] In the modified example 1, the control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1, thus reducing the number of thresholds to be set in the memory of the control device 2.

[0085] In addition, in the charge / discharge system A1 of the modified example 1, the control device 2 can switch the control mode of the charge / discharge device 1 between the first mode and the second mode. In the first mode, a supplemental charge operation is performed when the amount of charge E1 of the storage battery 101 is lower than the supplemental charge threshold C1. In the second mode, no supplemental charge operation is performed even if the amount of charge E1 of the storage battery 101 is lower than the supplemental charge threshold C1.

[0086] For example, the user can switch the control mode of the charge / discharge device 1 between the first mode and the second mode by operating the remote control 40. When the user uses the operation unit 42 of the remote control 40 to set the control mode of the charge / discharge device 1, the control unit of the remote control 40 transmits a signal containing setting information regarding the setting of the control mode of the charge / discharge device 1 to the control device 2 via the power supply unit 20. When the control device 2 receives the signal containing the setting information from the remote control 40 via the power supply unit 20, it sets the control mode of the charge / discharge device 1 to the control mode (first mode or second mode) according to the setting information.

[0087] When the control device 2 sets the control mode of the charge / discharge device 1 to the first mode, if the amount of charge E1 of the battery 101 is lower than the second discharge stop threshold B2, which is the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the control device 2 can charge the battery 101 to the second discharge stop threshold B2, which is the supplemental charge threshold C1, using the charge / discharge device 1. Also, if the amount of charge E1 of the battery 101 is less than the first discharge stop threshold B1 and greater than or equal to the second discharge stop threshold B2, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the charge / discharge device 1 does not automatically perform a supplemental charge operation of the battery 101, and the user can cause the charge / discharge device 1 to charge the battery 101 at the desired timing.

[0088] On the other hand, when the control device 2 sets the control mode of the charge / discharge device 1 to the second mode, even if the amount of charge E1 of the storage battery 101 is lower than the second discharge stop threshold B2, which is the supplemental charge threshold C1, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the charge / discharge device 1 does not automatically perform a supplemental charge operation of the storage battery 101, and the user can cause the charge / discharge device 1 to perform a charge operation of the storage battery 101 at the desired timing.

[0089] (4.2) Modification 2 The charge / discharge system A1 according to Modification 2 will be described with reference to Figures 5 and 6. Since the charge / discharge system A1 according to Modification 2 has the same configuration as the basic example or Modification 1, the same reference numerals are used for components common to the basic example or Modification 1, and their descriptions are omitted.

[0090] In the charge / discharge system A1 according to Modification 2, the control device 2 can switch the control mode of the charge / discharge device 1 between threshold separation mode and threshold common mode, as in the charge / discharge system A1 according to Modification 1. In threshold separation mode, the control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1 (see Figure 5). On the other hand, in threshold common mode, the control device 2 sets the first discharge stop threshold B1 as the supplemental charge threshold C1 (see Figure 6).

[0091] For example, the user can switch the control mode of the charge / discharge device 1 between threshold separation mode and threshold common mode by operating the remote control 40. When the user uses the operation unit 42 of the remote control 40 to set the control mode of the charge / discharge device 1 to either threshold separation mode or threshold common mode, the control unit of the remote control 40 transmits a signal containing setting information regarding the setting of the control mode of the charge / discharge device 1 to the control device 2 via the power supply unit 20. When the control device 2 receives the signal containing the setting information from the remote control 40 via the power supply unit 20, it sets the control mode of the charge / discharge device 1 to the control mode (threshold separation mode or threshold common mode) according to the setting information.

[0092] When the control device 2 sets the control mode of the charge / discharge device 1 to threshold separation mode, the control device 2 sets the second discharge stop threshold B2 as the supplemental charge threshold C1. In this case, if the amount of charge E1 of the battery 101 is lower than the second discharge stop threshold B2, which is the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the control device 2 can charge the battery 101 to the second discharge stop threshold B2, which is the supplemental charge threshold C1, using the charge / discharge device 1. Also, even if the amount of charge E1 of the battery 101 is less than the first discharge stop threshold B1, if it is greater than or equal to the second discharge stop threshold B2, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the user can cause the charge / discharge device 1 to perform a charge operation of the battery 101 at the desired timing.

[0093] On the other hand, when the control device 2 sets the control mode of the charge / discharge device 1 to the common threshold mode, the control device 2 sets the first discharge stop threshold B1 as the supplemental charge threshold C1. In this case, if the amount of charge E1 of the storage battery 101 is lower than the first discharge stop threshold B1, which is the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. Therefore, by causing the charge / discharge device 1 to perform a supplemental charge operation, the control device 2 can charge the storage battery 101 up to the first discharge stop threshold B1, which is the supplemental charge threshold C1.

[0094] (4.3) Modification 3 The charge / discharge system A1 according to the modified example 3 will be explained with reference to Figure 7.

[0095] The charge / discharge system A1 according to Modified Example 3 differs from the basic example in that the control device 2 sets the discharge lower threshold D1 as the supplemental charge threshold C1. Since the charge / discharge system A1 according to Modified Example 3 has the same configuration as the basic example, the same reference numerals are used for components common to both the basic and basic examples, and their explanations are omitted.

[0096] The battery 101 of the mobile unit 100 has a discharge limit threshold D1 set according to the type of mobile unit 100. The discharge limit threshold D1 is lower than the discharge stop threshold B1, and the control device 2 sets the discharge limit threshold D1 as the supplemental charge threshold C1 (see Figure 7). Note that the discharge limit threshold D1 is lower than the first discharge stop threshold B1 and lower than the second discharge stop threshold B2.

[0097] When the battery 101 of the mobile unit 100 is connected to the charge / discharge device 1, if the amount of charge E1 of the battery 101 is lower than the supplemental charge threshold C1, which is the lower discharge threshold D1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. In the supplemental charge operation, the battery 101 is charged until the amount of charge E1 of the battery 101 is equal to or greater than the supplemental charge threshold C1 (in this case, the lower discharge threshold D1), thereby increasing the amount of charge E1 of the battery 101 to equal or greater than the lower discharge threshold D1.

[0098] In addition, in the charge / discharge system A1 according to Modification 3, the control device 2 may be able to switch the control mode of the charge / discharge device 1 between a threshold separation mode and a common threshold mode. In the threshold separation mode, the control device 2 sets the discharge lower threshold D1 as the supplemental charge threshold C1 (see Figure 7). On the other hand, in the common threshold mode, the control device 2 sets the discharge stop threshold (first discharge stop threshold) B1 as the supplemental charge threshold C1 (see Figure 6).

[0099] For example, the user can switch the control mode of the charge / discharge device 1 between threshold separation mode and threshold common mode by operating the remote control 40. When the user uses the operation unit 42 of the remote control 40 to set the control mode of the charge / discharge device 1 to either threshold separation mode or threshold common mode, the control unit of the remote control 40 transmits a signal containing setting information regarding the setting of the control mode of the charge / discharge device 1 to the control device 2 via the power supply unit 20. When the control device 2 receives the signal containing the setting information from the remote control 40 via the power supply unit 20, it sets the control mode of the charge / discharge device 1 to the control mode (threshold separation mode or threshold common mode) according to the setting information.

[0100] When the control device 2 sets the control mode of the charge / discharge device 1 to threshold separation mode, the control device 2 sets the discharge lower threshold D1 as the supplemental charge threshold C1. In this case, if the amount of charge E1 of the battery 101 is lower than the discharge lower threshold D1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the control device 2 can charge the battery 101 to the discharge lower threshold D1 using the charge / discharge device 1. Also, even if the amount of charge E1 of the battery 101 is lower than the discharge stop threshold B1, if the amount of charge E1 is equal to or greater than the discharge lower threshold D1, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the user can cause the charge / discharge device 1 to perform a charge operation of the battery 101 at the desired timing.

[0101] On the other hand, when the control device 2 sets the control mode of the charge / discharge device 1 to the common threshold mode, the control device 2 sets the first discharge stop threshold B1 as the supplemental charge threshold C1. In this case, if the amount of charge E1 of the battery 101 is lower than the first discharge stop threshold B1, which is the supplemental charge threshold C1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the control device 2 can cause the charge / discharge device 1 to charge the battery 101 until the amount of charge E1 of the battery 101 is equal to or greater than the first discharge stop threshold B1. Also, if the amount of charge E1 of the battery 101 is equal to or greater than the first discharge stop threshold B1, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation. Therefore, the user can cause the charge / discharge device 1 to perform a charge operation of the battery 101 at the desired timing.

[0102] (4.4) Modification 4 The charge / discharge system A1 according to the modified example 4 will be explained with reference to Figure 8.

[0103] The charge / discharge system A1 according to Modification 4 differs from the basic example in that it further includes a power converter 3. Note that the configuration other than the power converter 3 is the same as the basic example; therefore, the same reference numerals are used for components common to both the basic and basic examples, and their descriptions are omitted.

[0104] The power converter 3 converts the first AC power to the first DC power. Furthermore, the power converter 3 converts the first DC power to the first AC power. In short, the power converter 3 is a bidirectional converter (bidirectional AC-DC converter).

[0105] In this case, the power converter 3 is electrically connected to the charge / discharge device 1 and the first power converter 21 of the power device 20. The power converter 3 is also electrically connected to the distribution board 80 via the power switching unit 70. The power converter 3 is also electrically connected to the grid power supply 90 via the power switching unit 70. The power converter 3 supplies first DC power to the charge / discharge device 1. The power converter 3 also supplies first AC power to at least one of the power device 20, the distribution board 80, and the grid power supply 90.

[0106] (4.5) Other variations The entity executing the charge / discharge device 1, the control device 2, or the control method for the control device 2 in this disclosure includes a computer system. The computer system mainly consists of a processor and memory as hardware. The processor executes a program recorded in the memory of the computer system, thereby realizing the function of the entity executing the charge / discharge device 1, the control device 2, or the control method for the control device 2 in this disclosure. The program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided on a non-temporary recording medium such as a memory card, optical disk, or hard disk drive that can be read by the computer system. The processor of the computer system consists of one or more electronic circuits including semiconductor integrated circuits (ICs) or large-scale integrated circuits (LSIs). The integrated circuits such as ICs and LSIs referred to here are named differently depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration). Furthermore, FPGAs (Field-Programmable Gate Arrays) programmed after the LSI is manufactured, or logic devices capable of reconfiguring internal junctions or circuit compartments within an LSI, can also be used as processors. Multiple electronic circuits may be integrated onto a single chip or distributed across multiple chips. Multiple chips may be integrated into a single device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller also consists of one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.

[0107] The charge / discharge system A1 may further include, for example, a power switching unit 70 and a distribution board 80. Furthermore, while the charge / discharge system A1 includes a solar cell module 30, it may not include the solar cell module 30. Instead of the solar cell module, the charge / discharge system A1 may include a small-scale hydroelectric power generation system, a wind power generation system, or a fuel cell, or it may include one or more of the solar cell module, small-scale hydroelectric power generation system, wind power generation system, and fuel cell.

[0108] In the basic example, the charge / discharge system A1 is equipped with a power supply unit 20, but it does not have to be equipped with a power supply unit 20. In this case, the remote control 40 is electrically connected to the control unit 2.

[0109] In the basic example, the charge / discharge system A1 is equipped with a remote control 40, but it is not required to be equipped with a remote control 40. Also, the charge / discharge system A1 is equipped with an energy storage device 10, but it is not required to be equipped with an energy storage device 10.

[0110] In the basic example, the charge / discharge system A1 supplies the power stored in the battery 101 to the grid power supply 90 or the load 81, but it may also supply it to, for example, the energy storage device 10.

[0111] In the basic example, the mobile device 100 is an electric vehicle, but it could also be an electric motorcycle or other vehicle; the mobile device 100 is not limited to a vehicle.

[0112] Furthermore, in the above explanation, where "less than or equal to" is used in the comparison of two values, it may also be used as "less than." In other words, whether or not the case where the two values ​​are equal is included in the comparison of two values ​​can be arbitrarily changed depending on the setting of the reference value, etc., so there is no technical difference between using "less than or equal to" and "less than." Similarly, where "greater than or equal to" is used, it may also be used as "greater than."

[0113] (Embodiment 2) The charge / discharge system A1 according to Embodiment 2 differs from Embodiment 1 in that the control content of the charge / discharge device 1 by the control device 2 is different. Since the charge / discharge system A1 according to Embodiment 2 has the same configuration as the basic example of the charge / discharge system A1 according to Embodiment 1, the same reference numerals are used for components common to both the basic example and the basic example, and their descriptions are omitted.

[0114] The charge / discharge system A1 according to Embodiment 2 comprises a charge / discharge device 1 and a control device 2 that controls the charge / discharge device 1.

[0115] The charging and discharging device 1 exchanges power between the battery 101 of the mobile body 100, which has the battery 101, and at least one of the grid power supply 90 and the load 81.

[0116] The control device 2 sets a discharge stop threshold B1 based on the amount of charge stored in the battery 101 connected to the charge / discharge device 1 (see Figure 6).

[0117] When the battery 101 is connected to the charge / discharge device 1, the control device 2 enables the charge / discharge device 1 to perform a discharge operation to discharge the battery 101 if the amount of charge stored in the battery 101 is higher than the discharge stop threshold B1.

[0118] When the charge / discharge device 1 is performing a discharge operation and the amount of charge stored in the battery 101 falls below the discharge stop threshold B1, the control device 2 instructs the charge / discharge device 1 to stop the discharge operation.

[0119] The control device 2 can switch the control mode of the charge / discharge device 1 between the first mode and the second mode.

[0120] In the first mode, when the battery 101 is connected to the charge / discharge device 1, if the amount of charge in the battery 101 is lower than the discharge stop threshold B1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. In the supplemental charge operation, the battery 101 is charged until the amount of charge in the battery 101 is equal to or greater than the discharge stop threshold B1.

[0121] In the second mode, when the battery 101 is connected to the charge / discharge device 1, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation even if the amount of charge stored in the battery 101 is lower than the discharge stop threshold B1.

[0122] In this case, in the charge / discharge system A1 of Embodiment 2, the control device 2 sets the discharge stop threshold (first discharge stop threshold) B1 as the supplemental charge threshold C1 described in Embodiment 1.

[0123] For example, the user can switch the control mode of the charge / discharge device 1 between the first mode and the second mode by operating the remote control 40. When the user uses the operation unit 42 of the remote control 40 to set the control mode of the charge / discharge device 1, the control unit of the remote control 40 transmits a signal containing setting information regarding the setting of the control mode of the charge / discharge device 1 to the control device 2 via the power supply unit 20. When the control device 2 receives the signal containing the setting information from the remote control 40 via the power supply unit 20, it sets the control mode of the charge / discharge device 1 to the control mode (first mode or second mode) according to the setting information.

[0124] When the control device 2 sets the control mode of the charge / discharge device 1 to the first mode, if the amount of charge E1 in the battery 101 is lower than the discharge stop threshold B1, the control device 2 causes the charge / discharge device 1 to perform a supplemental charge operation. At this time, the charge / discharge device 1 charges the battery 101 until the amount of charge E1 is equal to or greater than the discharge stop threshold B1, thereby ensuring sufficient charge for both power supply and driving.

[0125] On the other hand, when the control device 2 sets the control mode of the charge / discharge device 1 to the second mode, the control device 2 does not cause the charge / discharge device 1 to perform a supplemental charge operation even if the amount of charge E1 of the storage battery 101 is lower than the discharge stop threshold B1. Therefore, the charge / discharge device 1 does not automatically perform a supplemental charge operation of the storage battery 101, and the user can cause the charge / discharge device 1 to perform a charge operation of the storage battery 101 at the desired timing, thus improving the usability of the charge / discharge device 1.

[0126] (summary) Based on the embodiments described above, the following aspects are disclosed.

[0127] The first embodiment of the charge-discharge system (A1) comprises a charge-discharge device (1) and a control device (2) that controls the charge-discharge device (1). The charge-discharge device (1) exchanges power between the battery (101) of a mobile body (100) having a battery (101) and at least one of a grid power supply (90) and a load (81). The control device (2) sets a discharge stop threshold (B1) and a supplemental charge threshold (C1) lower than the discharge stop threshold (B1) with respect to the amount of charge stored in the battery (101) connected to the charge-discharge device (1). When the battery (101) is connected to the charge-discharge device (1), if the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1), the control device (2) causes the charge-discharge device (1) to perform a supplemental charge operation. In supplemental charging operation, the battery (101) is charged until its charge level exceeds the supplemental charging threshold (C1). When the battery (101) is connected to the charge / discharge device (1), if the charge level of the battery (101) is higher than the discharge stop threshold (B1), the control device (2) enables the charge / discharge device (1) to perform a discharge operation to discharge the battery (101). If the charge level of the battery (101) falls below the discharge stop threshold (B1) while the charge / discharge device (1) is performing a discharge operation, the control device (2) causes the charge / discharge device (1) to stop the discharge operation.

[0128] According to this embodiment, when the battery (101) is connected to the charge / discharge device (1), if the amount of charge in the battery (101) is equal to or greater than a supplemental charge threshold (C1) which is lower than the discharge stop threshold (B1), the control device (2) does not cause the charge / discharge device (1) to perform a supplemental charge operation. Therefore, the user of the mobile unit (100) can cause the charge / discharge device (1) to perform a charge operation of the battery (101) at a desired timing, thereby improving the usability of the charge / discharge device (1) for charging and discharging the battery (101) of the mobile unit (100).

[0129] In the second embodiment of the charge-discharge system (A1), in the first embodiment, the control device (2) can switch the control mode of the charge-discharge device (1) between a first mode and a second mode. In the first mode, a supplemental charge operation is performed when the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1). In the second mode, no supplemental charge operation is performed even if the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1).

[0130] According to this embodiment, the control mode of the charge / discharge device (1) can be switched between the first mode and the second mode, thereby further improving the usability of the charge / discharge device (1).

[0131] In the third embodiment of the charge-discharge system (A1), in the first embodiment, the discharge stop threshold (B1) is the first discharge stop threshold (B1) when the grid power supply (90) is not interrupted. The control device (2) further sets a second discharge stop threshold (B2) when the grid power supply (90) is interrupted. The second discharge stop threshold (B2) is lower than the first discharge stop threshold (B1). When the grid power supply (90) is interrupted, if the amount of charge stored in the battery (101) falls below the second discharge stop threshold (B2) while the charge-discharge device (1) is performing a discharge operation, the control device (2) causes the charge-discharge device (1) to stop the discharge operation. The control device (2) sets the second discharge stop threshold (B2) as the supplemental charge threshold (C1).

[0132] According to this embodiment, the second discharge stop threshold (B2) is set as the supplemental charge threshold (C1), thus reducing the number of thresholds that need to be set.

[0133] In the fourth embodiment of the charge-discharge system (A1), in the third embodiment, the control device (2) can switch the control mode of the charge-discharge device (1) between a first mode and a second mode. In the first mode, a supplemental charge operation is performed when the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1). In the second mode, no supplemental charge operation is performed even if the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1).

[0134] According to this embodiment, the control mode of the charge / discharge device (1) can be switched between the first mode and the second mode, thereby further improving the usability of the charge / discharge device (1).

[0135] In the fifth embodiment of the charge-discharge system (A1), in the third embodiment, the control device (2) can switch the control mode of the charge-discharge device (1) between a threshold-separated mode and a threshold-common mode. In the threshold-separated mode, the control device (2) sets the second discharge stop threshold (B2) as the supplemental charge threshold (C1). In the threshold-common mode, the control device (2) sets the first discharge stop threshold (B1) as the supplemental charge threshold (C1).

[0136] According to this embodiment, the control mode of the charge / discharge device (1) can be switched between threshold separation mode and threshold common mode, thereby further improving the usability of the charge / discharge device (1).

[0137] In the sixth embodiment of the charge-discharge system (A1), in the first embodiment, the battery (101) of the mobile unit (100) has a discharge lower threshold (D1) set corresponding to the type of mobile unit (100). The discharge lower threshold (D1) is lower than the discharge stop threshold (B1). The control device (2) sets the discharge lower threshold (D1) as the supplemental charge threshold (C1).

[0138] According to this embodiment, the discharge lower limit threshold (D1) is set as the supplemental charge threshold (C1), thus reducing the number of thresholds that need to be set.

[0139] In the seventh embodiment of the charge-discharge system (A1), as in the sixth embodiment, the control device (2) can switch the control mode of the charge-discharge device (1) between a threshold-separated mode and a threshold-common mode. In the threshold-separated mode, the control device (2) sets the discharge lower threshold (D1) as the supplemental charge threshold (C1). In the threshold-common mode, the control device (2) sets the discharge stop threshold (B1) as the supplemental charge threshold (C1).

[0140] According to this embodiment, the control mode of the charge / discharge device (1) can be switched between threshold separation mode and threshold common mode, thereby further improving the usability of the charge / discharge device (1).

[0141] The eighth aspect of the charge-discharge system (A1) comprises a charge-discharge device (1) and a control device (2) that controls the charge-discharge device (1). The charge-discharge device (1) exchanges power between the battery (101) of a mobile body (100) having a battery (101) and at least one of a grid power supply (90) and a load (81). The control device (2) sets a discharge stop threshold (B1) for the amount of charge stored in the battery (101) connected to the charge-discharge device (1). When the battery (101) is connected to the charge-discharge device (1), if the amount of charge stored in the battery (101) is higher than the discharge stop threshold (B1), the control device (2) enables the charge-discharge device (1) to perform a discharge operation to discharge from the battery (101). The control device (2) stops the discharge operation of the charge / discharge device (1) if the amount of charge in the battery (101) falls below the discharge stop threshold (B1) while the charge / discharge device (1) is performing a discharge operation. The control device (2) can switch the control mode of the charge / discharge device (1) between a first mode and a second mode. In the first mode, when the battery (101) is connected to the charge / discharge device (1), if the amount of charge in the battery (101) is lower than the discharge stop threshold (B1), the charge / discharge device (1) is made to perform a supplemental charge operation. In the supplemental charge operation, the battery (101) is charged until the amount of charge in the battery (101) is equal to or greater than the discharge stop threshold (B1). In the second mode, when the battery (101) is connected to the charge / discharge device (1), even if the amount of charge in the battery (101) is lower than the discharge stop threshold (B1), the charge / discharge device (1) is not made to perform a supplemental charge operation.

[0142] According to this embodiment, when the control device (2) switches the control mode of the charge / discharge device (1) to the second mode, even if the amount of charge in the battery (101) is lower than the discharge stop threshold (B1), the control device (2) does not cause the charge / discharge device (1) to perform a supplemental charge operation. Therefore, the user of the mobile unit (100) can cause the charge / discharge device (1) to perform a charge operation of the battery (101) at a desired timing, thereby improving the usability of the charge / discharge device (1) for charging and discharging the battery (101) of the mobile unit (100).

[0143] The control device (2) of the ninth embodiment is capable of controlling the charge / discharge device (1). The charge / discharge device (1) exchanges power between the battery (101) of a mobile body (100) having a battery (101) and at least one of the grid power supply (90) and the load (81). The control device (2) sets a discharge stop threshold (B1) and a supplemental charge threshold (C1) lower than the discharge stop threshold (B1) with respect to the amount of charge stored in the battery (101) connected to the charge / discharge device (1). When the battery (101) is connected to the charge / discharge device (1), if the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1), the control device (2) causes the charge / discharge device (1) to perform a supplemental charge operation. In the supplemental charge operation, the battery (101) is charged until the amount of charge stored in the battery (101) is equal to or greater than the supplemental charge threshold (C1). When the battery (101) is connected to the charge / discharge device (1), the control device (2) enables the charge / discharge device (1) to perform a discharge operation to discharge the battery (101) if the amount of charge in the battery (101) is higher than the discharge stop threshold (B1). If the amount of charge in the battery (101) falls below the discharge stop threshold (B1) while the charge / discharge device (1) is performing a discharge operation, the control device (2) causes the charge / discharge device (1) to stop the discharge operation.

[0144] According to this embodiment, when the battery (101) is connected to the charge / discharge device (1), if the amount of charge in the battery (101) is equal to or greater than a supplemental charge threshold (C1) which is lower than the discharge stop threshold (B1), the control device (2) does not cause the charge / discharge device (1) to perform a supplemental charge operation. Therefore, the user of the mobile unit (100) can cause the charge / discharge device (1) to perform a charge operation of the battery (101) at a desired timing, thereby improving the usability of the charge / discharge device (1) for charging and discharging the battery (101) of the mobile unit (100).

[0145] The control method of the tenth embodiment is a control method performed by a control device (2) capable of controlling a charge / discharge device (1). The charge / discharge device (1) exchanges power between the battery (101) of a mobile body (100) having a battery (101) and at least one of the grid power supply (90) and the load (81). In the control method, a discharge stop threshold (B1) and a supplemental charge threshold (C1) lower than the discharge stop threshold (B1) are set for the amount of charge stored in the battery (101) connected to the charge / discharge device (1). In the control method, when the battery (101) is connected to the charge / discharge device (1), if the amount of charge stored in the battery (101) is lower than the supplemental charge threshold (C1), the charge / discharge device (1) is made to perform a supplemental charge operation. In the supplemental charge operation, the battery (101) is charged until the amount of charge stored in the battery (101) is equal to or greater than the supplemental charge threshold (C1). In the control method, when a battery (101) is connected to the charge / discharge device (1), if the amount of charge in the battery (101) is higher than the discharge stop threshold (B1), the charge / discharge device (1) is enabled to perform a discharge operation to discharge the battery (101). In the control method, if the amount of charge in the battery (101) falls below the discharge stop threshold (B1) while the charge / discharge device (1) is performing a discharge operation, the charge / discharge device (1) is instructed to stop the discharge operation.

[0146] According to this embodiment, when the battery (101) is connected to the charge / discharge device (1), if the amount of charge in the battery (101) is equal to or greater than a supplemental charge threshold (C1) which is lower than the discharge stop threshold (B1), the control device (2) does not cause the charge / discharge device (1) to perform a supplemental charge operation. Therefore, the user of the mobile unit (100) can cause the charge / discharge device (1) to perform a charge operation of the battery (101) at a desired timing, thereby improving the usability of the charge / discharge device (1) for charging and discharging the battery (101) of the mobile unit (100).

[0147] The eleventh embodiment of the program is a program for causing one or more processors to execute the control method of the tenth embodiment.

[0148] According to this embodiment, similar to the tenth embodiment, the usability of the charge / discharge device (1) for charging and discharging the battery (101) of the mobile body (100) can be improved.

[0149] Not limited to the above embodiments, various configurations (including modifications) of the charge / discharge system (A1) and control device (2) according to the above embodiments can be realized by a control method for the control device (2), a (computer) program, or a non-temporary recording medium on which the program is recorded.

[0150] The configurations relating to the second to seventh aspects are not essential to the charge / discharge system (A1) relating to the first aspect and can be omitted as appropriate. [Explanation of symbols]

[0151] 1 Charge / discharge device 2 Control device 81 load 90 Grid power supply 100 Mobile Units 101 Storage Battery A1 Charging and Discharging System B1 Discharge termination threshold (first discharge termination threshold) B2 Second discharge termination threshold C1 supplemental charge threshold D1 Discharge lower threshold

Claims

1. A mobile body having a storage battery, and a charging / discharging device that exchanges power between the storage battery and at least one of the grid power supply and the load, The charging and discharging device comprises a control device for controlling the charging and discharging device, The control device is A discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold are set with respect to the amount of charge stored in the battery connected to the charge / discharge device. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is lower than the supplemental charge threshold, the charge / discharge device is instructed to perform a supplemental charge operation to charge the battery until the amount of charge in the battery is equal to or greater than the supplemental charge threshold. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is higher than the discharge stop threshold, the charge / discharge device is enabled to perform a discharge operation to discharge the battery. If the charge / discharge device is performing the discharge operation and the amount of charge stored in the battery falls below the discharge stop threshold, the charge / discharge device will stop the discharge operation. Charging and discharging system.

2. The control device can switch the control mode of the charge / discharge device between a first mode in which the supplemental charging operation is performed when the amount of charge in the battery is lower than the supplemental charging threshold, and a second mode in which the supplemental charging operation is not performed even when the amount of charge in the battery is lower than the supplemental charging threshold. The charge / discharge system according to claim 1.

3. The discharge stop threshold is the first discharge stop threshold when the power grid is not interrupted. The control device further sets a second discharge stop threshold in the event of a power outage in the power grid, The second discharge stop threshold is lower than the first discharge stop threshold, When the power supply to the grid is interrupted, if the amount of charge stored in the battery falls below the second discharge stop threshold while the charge / discharge device is performing the discharge operation, the control device will cause the charge / discharge device to stop the discharge operation. The control device sets the second discharge stop threshold as the supplemental charge threshold. The charge / discharge system according to claim 1.

4. The control device can switch the control mode of the charge / discharge device between a first mode in which the supplemental charging operation is performed when the amount of charge in the battery is lower than the supplemental charging threshold, and a second mode in which the supplemental charging operation is not performed even when the amount of charge in the battery is lower than the supplemental charging threshold. The charge / discharge system according to claim 3.

5. The control device can switch the control mode of the charge / discharge device between a threshold separation mode and a threshold common mode. In the threshold separation mode, the control device sets the second discharge stop threshold as the supplemental charge threshold. In the common threshold mode, the control device sets the first discharge stop threshold as the supplemental charge threshold. The charge / discharge system according to claim 3.

6. The battery of the mobile body has a discharge limit threshold set that corresponds to the type of mobile body. The discharge lower threshold is lower than the discharge stop threshold. The control device sets the discharge lower threshold as the supplemental charge threshold. The charge / discharge system according to claim 1.

7. The control device can switch the control mode of the charge / discharge device between a threshold separation mode and a threshold common mode. In the threshold separation mode, the control device sets the discharge lower threshold as the supplemental charge threshold. In the common threshold mode, the control device sets the discharge stop threshold as the supplemental charge threshold. The charge / discharge system according to claim 6.

8. A mobile body having a storage battery, and a charging / discharging device that exchanges power between the storage battery and at least one of the grid power supply and the load, The charging and discharging device comprises a control device for controlling the charging and discharging device, The control device is A discharge stop threshold is set for the amount of charge stored in the battery connected to the charging / discharging device, When the battery is connected to the charge / discharge device, if the amount of charge in the battery is higher than the discharge stop threshold, the charge / discharge device is enabled to perform a discharge operation to discharge the battery. If the amount of charge stored in the battery falls below the discharge stop threshold while the charge / discharge device is performing the discharge operation, the charge / discharge device will stop the discharge operation. The control device controls the control mode of the charge / discharge device, When the battery is connected to the charge / discharge device, if the amount of charge in the battery is lower than the discharge stop threshold, a first mode is provided in which the charge / discharge device is instructed to perform a supplemental charging operation to charge the battery until the amount of charge in the battery is equal to or greater than the discharge stop threshold. When the battery is connected to the charging / discharging device, it is possible to switch to either a second mode in which the charging / discharging device does not perform the supplemental charging operation even if the amount of charge in the battery is lower than the discharge stop threshold. Charging and discharging system.

9. A control device capable of controlling a charge / discharge device that exchanges power between the battery of a mobile body having a battery and at least one of a grid power supply and a load, A discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold are set with respect to the amount of charge stored in the battery connected to the charge / discharge device. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is lower than the supplemental charge threshold, the charge / discharge device is instructed to perform a supplemental charge operation to charge the battery until the amount of charge in the battery is equal to or greater than the supplemental charge threshold. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is higher than the discharge stop threshold, the charge / discharge device is enabled to perform a discharge operation to discharge the battery. If the charge / discharge device is performing the discharge operation and the amount of charge stored in the battery falls below the discharge stop threshold, the charge / discharge device will stop the discharge operation. Control device.

10. A control method for a control device capable of controlling a charge / discharge device that exchanges power between a battery in a mobile body having a battery and at least one of a grid power supply and a load, A discharge stop threshold and a supplemental charge threshold lower than the discharge stop threshold are set with respect to the amount of charge stored in the battery connected to the charge / discharge device. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is lower than the supplemental charge threshold, the charge / discharge device is instructed to perform a supplemental charge operation to charge the battery until the amount of charge in the battery is equal to or greater than the supplemental charge threshold. When the battery is connected to the charge / discharge device, if the amount of charge in the battery is higher than the discharge stop threshold, the charge / discharge device is enabled to perform a discharge operation to discharge the battery. If the charge / discharge device is performing the discharge operation and the amount of charge stored in the battery falls below the discharge stop threshold, the charge / discharge device will stop the discharge operation. Control method.

11. One or more processors are used to execute the control method described in claim 10, program.

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