Power supply device, power supply method, and program

Abstract

To provide a technique for more certainly allowing maximum utilization of a battery mounted on a vehicle as an emergency power source at the occurrence of a disaster.SOLUTION: An exemplary power supply device performs external power supply for supplying power from a battery mounted on a vehicle to the outside of the vehicle. The power supply device comprises a controller which stops power supply when a remaining amount of the battery becomes equal to or lower than a threshold while the external power supply is performed, and continues power supply when at least one of a first condition, a second condition, and a third condition is satisfied even when the remaining amount of the battery becomes equal to or lower than the threshold. The first condition is a case when current of threshold current or higher is extracted from the battery. The second condition is a case when current is extracted from an emergency outlet provided outside the vehicle. The third condition is a case when a time until a travel start scheduled time of the vehicle is equal to or longer than a threshold time.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a power supply device, a power supply method, and a program. [Background technology]

[0002] A power supply device that performs external power supply, which supplies power from a battery mounted on a vehicle such as a BEV (Battery Electric Vehicle) or a PHEV (Plug-in Hybrid Electric Vehicle), basically stops power supply when the remaining battery charge falls below a threshold during external power supply. This power supply stop operation prevents the remaining battery charge from running out and the vehicle's driving range from becoming too short when the user actually uses the vehicle as a means of transportation.

[0003] The power supply device disclosed in Patent Document 1 continues to supply power when it detects that a disaster has occurred at the vehicle's current location, even if the remaining battery charge falls below a threshold. This continuous power supply operation makes it possible to make maximum use of the vehicle's onboard battery as an emergency power source in the event of a disaster. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-161687 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the power supply device disclosed in Patent Document 1 acquires information about the occurrence of a disaster through wireless communication with a data center, and there is a risk that wireless communication with the data center may be disrupted when a disaster occurs.

[0006] In view of the above circumstances, an object of the present invention is to provide a technology that enables a battery mounted on a vehicle to be used to the maximum extent possible as an emergency power source in the event of a disaster. [Means for solving the problem]

[0007] An exemplary power supply device of the present invention performs external power supply, supplying power from a battery mounted on a vehicle to an external device of the vehicle. The power supply device includes a controller that stops power supply when the remaining charge of the battery falls below a threshold during the external power supply, and continues power supply even when the remaining charge of the battery falls below the threshold if at least one of a first condition, a second condition, and a third condition is met. The first condition is when a current equal to or greater than a threshold current is being drawn from the battery. The second condition is when current is being drawn from an emergency outlet provided outside the vehicle. The third condition is when the time until the scheduled start time of the vehicle is equal to or greater than a threshold time. [Effects of the Invention]

[0008] According to the exemplary embodiment of the present invention, if at least one of the first to third conditions is met, external power supply, which supplies power from the battery to the outside of the vehicle, continues even if the remaining battery charge falls below a threshold, making it possible to more reliably make maximum use of the battery installed in the vehicle as an emergency power source in the event of a disaster. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a power system according to an exemplary embodiment of the present invention. [Figure 2] FIG. 1 shows a first example of the configuration of a V2H device and a charging / discharging device. [Figure 3] Flowchart showing control processing of a charging / discharging device [Figure 4] FIG. 2 shows a second configuration example of a V2H device and a charging / discharging device. [Figure 5] Flowchart showing the control process of V2H devices DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.

[0011] <Power System> FIG. 1 is a diagram showing an example of the configuration of a power system SYS1 according to an exemplary embodiment of the present invention.

[0012] The power system SYS1 exchanges power between a battery B1 mounted on a vehicle V1 and a house H1. The power system SYS1 includes a solar power generation system 1, a power storage device 2, a distribution board 3, a plurality of outlets 4, an emergency outlet 5, a V2H (Vehicle to Home) device 6, and a charging / discharging device 7. Unlike the configuration example shown in FIG. 1 , the power system SYS1 may be configured without at least one of the solar power generation system 1, the power storage device 2, and the emergency outlet 5.

[0013] The solar power generation system 1, the power storage system 2, the distribution board 3, the multiple outlets 4, and the emergency outlet 5 are installed in the house H1. The solar panels and power conditioner of the solar power generation system 1 are arranged outside the house H1. The battery and power conditioner of the power storage system 2 are arranged outside the house H1. The distribution board 3, the multiple outlets 4, and the emergency outlet 5 are arranged inside the house H1.

[0014] The solar power generation device 1 converts DC (Direct Current) power generated by a solar panel into AC (Alternating Current) power and outputs the AC power.

[0015] The power storage device 2 performs a charging operation of converting the received AC power into DC power and charging the battery in the power storage device 2. The power storage device 2 also performs a discharging operation of converting DC power discharged from the battery in the power storage device 2 into AC power and outputting it.

[0016] The distribution board 3 supplies AC power received from at least some of the power grid SPS1, the photovoltaic power generation device 1, the power storage device 2, and the V2H devices 6 to the multiple outlets 4. The distribution board 3 supplies AC power received from at least some of the power grid SPS1 and the photovoltaic power generation device 1 to the power storage device 2. The distribution board 3 supplies at least some of the AC power received from the power grid SPS1, the photovoltaic power generation device 1, and the power storage device 2 to the V2H devices 6.

[0017] When the solar power generation device 1 and the storage device 2 are operating independently without being connected to the grid power supply SPS1, the distribution board 3 supplies AC power received from at least a portion of the solar power generation device 1 and the storage device 2 to the emergency outlet 5.

[0018] The outlets 4 supply AC power to electrical devices when the devices are connected to them.

[0019] When an electrical device is connected to the emergency outlet 5 while the solar power generation device 1 and the power storage device 2 are operating independently, the emergency outlet 5 supplies AC power to the electrical device.

[0020] The V2H device 6 performs H2V operation by converting AC power received from a distribution board 3 installed in the house H1 into DC power and outputting it to the vehicle V1. The V2H device 6 also performs V2H operation by converting DC power received from the vehicle V1 into AC power and outputting it to the distribution board 3 installed in the house H1.

[0021] The V2H device 6 includes a cable CBL1. A plug P1 is provided at the end of the cable CBL1. The plug P1 is detachable from a receptacle R1 provided on the vehicle V1. The V2H device 6 performs H2V or V2H operation with the plug P1 attached to the receptacle R1.

[0022] The charging and discharging device 7 is mounted on the vehicle V1. The charging and discharging device 7 performs a charging operation of converting the DC power received from the receptacle R1 (DC power with a first voltage value) into DC power with a different voltage value (DC power with a second voltage value) and supplying it to the battery B1. The charging and discharging device 7 also performs a discharging operation of converting the DC power received from the battery B1 (DC power with a second voltage value) into DC power with a different voltage value (DC power with a first voltage value) and supplying it to the receptacle R1.

[0023] <First Configuration Example of V2H Device and Charging and Discharging Device> FIG. 2 is a diagram showing a first configuration example of the V2H device 6 and the charging and discharging device 7.

[0024] The V2H device 6 shown in FIG. 2 includes an input unit 60, a bidirectional AC / DC converter 61, a controller 62, a memory 63, and a communication unit 64.

[0025] The input unit 60 receives a threshold value, a standby current value, a schedule, etc. input by a user operation. The data received by the input unit 60 is appropriately stored in the memory 63 under the control of the controller 62.

[0026] The bidirectional AC / DC converter 61 is a power converter that can switch between performing a power conversion operation of converting AC power into DC power and a power conversion operation of converting DC power into AC power.

[0027] The controller 62 is composed of a computer or the like and includes a processor that performs arithmetic processing and the like. The processor may be configured to include, for example, a CPU (Central Processing Unit). The controller 62 may be composed of one processor or a plurality of processors. When composed of a plurality of processors, those processors may be connected to be communicable with each other. The functions of the controller 62 are realized by the processor executing arithmetic processing according to the program 631 stored in the memory 63.

[0028] The memory 63 includes volatile memory and nonvolatile memory. The volatile memory may include, for example, RAM (Random Access Memory). The nonvolatile memory may include, for example, ROM (Read Only Memory), flash memory, or a hard disk drive. The nonvolatile memory stores computer-readable programs and data.

[0029] The program 631 is a program to be executed by the controller 62 .

[0030] The threshold value 632 is a set value related to the SOC (State Of Charge) of the battery B1, that is, the remaining capacity of the battery B1. The threshold value 632 may be a value inputted by the input unit 60, or may be a value stored in the memory 63 as a default.

[0031] The standby current value 633 is an estimated value of the standby current generated in the house H1. The standby current value 633 may be a value input by the input unit 60, or may be a value stored in the memory 63 by default.

[0032] The standby current value 633 (threshold value of the standby current, in other words, the boundary value between the standby current and the non-standby current) may be set (stored) in advance based on the amount of current used in a typical home. Alternatively, the amount of current used in a home where the electrical appliances are actually installed may be measured, and the standby current value 633 may be set (stored) based on the average amount of current used calculated from the measurement results (a current value that is larger than the average amount of current used by a predetermined value may be set as the standby current value 633). Note that the standby current value 633 may not be set (stored) and the calculation of the average amount of current used described above may be performed based on the amount of current over an extremely short period. When a current that is larger than the immediately preceding amount of current used by a predetermined value or more is detected, it may be deemed to satisfy the first condition described below.

[0033] Schedule 634 is a schedule that specifies the start and end times of timer charging of battery B1. Schedule 634 may be values ​​input through input unit 60, or may be values ​​that are stored as defaults in schedule 634. Timer charging of battery B1 makes it easy to charge battery B1 using, for example, late-night electricity when electricity rates are low.

[0034] The threshold time 635 is a set value related to the scheduled start time of the vehicle V1. The threshold time 635 may be a value input through the input unit 60, or may be a value stored in the memory 63 as a default.

[0035] The communication unit 64 is an interface for performing data communication, for example, wired communication, with the communication unit 74 of the charge / discharge device 7 and the communication unit (not shown) of the distribution board 3.

[0036] 2 includes a bidirectional DC / DC converter 71, a controller 72, a memory 73, a communication unit 74, and a current detection unit 75. The charging / discharging device 7 shown in Fig. 2 is a power supply device that performs external power supply, supplying power from a battery B1 to a house H1 via a V2H device 6.

[0037] The bidirectional DC / DC converter 71 is a power converter that can switch between a power conversion operation of converting DC power (DC power of a first voltage value) into DC power of a different voltage value (DC power of a second voltage value) and a power conversion operation of converting DC power (DC power of a second voltage value) into DC power of a different voltage value (DC power of the first voltage value). The bidirectional DC / DC converter 71 receives DC power of the first voltage value from the V2H device 6 and receives DC power of the second voltage value from the battery B1. The second voltage value may be a value that varies depending on the remaining charge of the battery B1.

[0038] The controller 72 includes a processor that performs arithmetic processing and the like. The processor may be configured to include, for example, a CPU. The controller 72 may be configured with one processor or multiple processors. When configured with multiple processors, the processors only need to be connected to each other so that they can communicate with each other. The functions of the controller 72 are realized by the processor executing arithmetic processing in accordance with a program 731 stored in the memory 73.

[0039] The memory 73 includes volatile memory and nonvolatile memory. The volatile memory may include, for example, RAM. The nonvolatile memory may include, for example, ROM, flash memory, or a hard disk drive. The nonvolatile memory stores computer-readable programs and data.

[0040] The program 731 is a program to be executed by the controller 72 .

[0041] The threshold value 732, standby current value 733, and schedule 734 are data that the controller 72 has written into the memory 73 after reading the threshold value 632, standby current value 633, and schedule 634 from the memory 63 via the communication units 64 and 74 and the controller 62.

[0042] The communication unit 74 is an interface for performing wired data communication with the communication unit 64 of the V2H device 6.

[0043] The current detection unit 75 detects the value of the current flowing from the battery B1 to the V2H device 6 when the bidirectional DC / DC converter 71 performs a power conversion operation to convert DC power of the second voltage value into DC power of the first voltage value.

[0044] Power transmission between the bidirectional AC / DC converter 61 and the bidirectional DC / DC converter 71 and wired communication between the communication unit 64 and the communication unit 74 are performed via a cable CBL1 of the V2H device 6.

[0045] Fig. 3 is a flowchart showing the control process of the charging / discharging device 7 shown in Fig. 2. When the controller 72 detects that the plug P1 of the cable CBL1 is attached to the receptacle R1 of the vehicle V1 and that wired communication between the communication unit 64 and the communication unit 74 is established, the controller 72 starts the control process shown in Fig. 3. The controller 72 also starts the control process shown in Fig. 3 when it detects that the communication unit 74 has received, via the communication unit 64, a reset signal that is output from the distribution board 3 when the power outage is resolved.

[0046] In step S1, the controller 72 requests the V2H device 6 to transmit data on the threshold 632, the standby current value 633, and the schedule 634, and stores the threshold 632, the standby current value 633, the schedule 634, and the threshold time 635 transmitted from the V2H device 6 in the memory 73 as the threshold 732, the standby current value 733, the schedule 734, and the threshold time 735. When the processing of step S1 ends, the process proceeds to step S2.

[0047] In step S2, the controller 72 performs charging, power supply, or standby in accordance with a control sequence defined in the program 731. In the case of charging, the controller 72 causes the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of a first voltage value into DC power of a second voltage value, and instructs the V2H device 6 to cause the bidirectional AC / DC converter 61 to perform a power conversion operation of converting AC power to DC power. In the case of power supply, the controller 72 causes the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of a second voltage value into DC power of a first voltage value, and instructs the V2H device 6 to cause the bidirectional AC / DC converter 61 to perform a power conversion operation of converting DC power to AC power. In the case of standby, the controller 72 stops the power conversion operation of the bidirectional DC / DC converter 71 and instructs the V2H device 6 to stop the power conversion operation of the bidirectional AC / DC converter 61. In addition, in the case of standby, the controller 72 may turn off a relay provided in the charging / power supply path.

[0048] During the processing of step S2, the controller 72 determines whether or not a power outage has occurred in the residence H1 (step S3). For example, in this determination, the controller 72 may determine that a power outage has occurred in the residence H1 when it detects that the communication unit 74 has received, via the communication unit 64, a power outage notification signal that is output from the distribution board 3 when a power outage has occurred. If it is determined that a power outage has occurred in the residence H1, the process proceeds to step S4.

[0049] In step S4, the controller 72 supplies power. That is, the controller 72 causes the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of the second voltage value into DC power of the first voltage value, and instructs the V2H device 6 to cause the bidirectional AC / DC converter 61 to perform a power conversion operation of converting DC power into AC power.

[0050] During the processing of step S4, the controller 72 determines whether the remaining charge of the battery B1 is equal to or less than the threshold value 732 (step S5). For example, in this determination, the controller 72 may monitor the second voltage value described above and calculate the remaining charge of the battery B1 from the second voltage value. If it is determined that the remaining charge of the battery B1 is equal to or less than the threshold value 732, the process proceeds to step S6.

[0051] In step S6, the controller 72 determines whether or not the first condition is met. If it is determined that the first condition is not met, the process proceeds to step S7. On the other hand, if it is determined that the first condition is met, the process proceeds to step S9.

[0052] In step S7, the controller 72 determines whether or not the second condition is met. If it is determined that the second condition is not met, the process proceeds to step S8. On the other hand, if it is determined that the second condition is met, the process proceeds to step S9.

[0053] In step S8, the controller 72 determines whether or not a third condition is met. If it is determined that the third condition is not met, the process proceeds to step S10. On the other hand, if it is determined that the third condition is met, the process proceeds to step S9.

[0054] That is, if at least one of the first to third conditions is met, the process proceeds to step S9, and if none of the first to third conditions is met, the process proceeds to step S10.

[0055] The first condition is when a current equal to or greater than the threshold current is drawn from battery B1, for example, when a current greater than the standby current (standby current value 733) is drawn from battery B1. The value of the current drawn from battery B1 is detected by current detection unit 75.

[0056] The second condition is when current is being drawn from the emergency outlet 5 provided in the residence H1. The distribution board 3 has a built-in current detection unit that detects whether current is being drawn from the emergency outlet 5. When current is being drawn from the emergency outlet 5, the controller 72 receives an emergency outlet use notification signal (a signal indicating that the second condition is met) output from the residence H1 (more specifically, the distribution board 3) via the communication units 64 and 74.

[0057] The controller 72 can easily determine whether the second condition is met by receiving from the house H1 a signal indicating that the second condition is met.

[0058] The third condition is that the time until the scheduled start time of vehicle V1 is equal to or greater than threshold time 735. In this embodiment, controller 72 estimates the scheduled start time of vehicle V1 based on timer charging schedule 734 for battery B1. For example, controller 72 may estimate the charging end time of timer charging schedule 734 as the scheduled start time of vehicle V1.

[0059] By the controller 72 estimating the scheduled start time of the vehicle V1 based on the schedule 734 of timer charging for the battery B1, it is possible to easily determine whether or not the third condition is satisfied.

[0060] The first to third conditions are respectively conditions where it is assumed that power supply to the house H1 is prioritized over maintaining the remaining amount of the battery B1.

[0061] In step S9, the controller 72 continues power supply to the house H1 until the remaining amount of the battery B1 runs out. In step S10, the controller 72 stops power supply to the house H1. When the processing of step S9 or step S10 ends, the controller 72 ends the control of the flow shown in FIG. 3.

[0062] According to the control of the flow shown in FIG. 3, if any of the first to third conditions is satisfied, power supply to the house H1 is continued until the remaining amount of the battery B1 runs out. Thereby, it becomes more certain that the battery B1 can be maximally used as an emergency power source in the event of a disaster.

[0063] Also, according to the control of the flow shown in FIG. 3, since external power supply to the house H1 is performed when a power outage occurs in the house H1, the battery B1 can be used as an emergency power source only when there is a power outage in the house H1.

[0064] <Second Configuration Example of V2H Device and Charging / Discharging Device> FIG. 4 is a diagram showing a second configuration example of the V2H device 6 and the charging / discharging device 7.

[0065] The V2H device 6 shown in FIG. 4 includes an input unit 60, a bidirectional AC / DC converter 61, a controller 62, a memory 63, a communication unit 64, and a current detection unit 65.

[0066] The input unit 60, the bidirectional AC / DC converter 61, the controller 62, the memory 63, and the communication unit 64 are the same as those in the first configuration example described above, and thus the description thereof is omitted.

[0067] The current detection unit 65 detects the value of the current flowing from the charge / discharge device 7 toward the house H16 when the bidirectional AC / DC converter 61 performs a power conversion operation of converting DC power into AC power.

[0068] The charging / discharging device 7 shown in Fig. 4 includes a bidirectional DC / DC converter 71, a controller 72, a memory 73, and a communication unit 74. The V2H device 6 shown in Fig. 4 is a power supply device that performs external power supply, supplying power from a battery B1 to a house H1 via the charging / discharging device 7.

[0069] The bidirectional DC / DC converter 71, controller 72, memory 73, and communication unit 74 are basically the same as those in the first configuration example described above, and therefore description thereof will be omitted. Note that, unlike the first configuration example described above, in the second configuration example, the memory 73 does not store the threshold value 732, standby current value 733, schedule 734, and threshold time 735.

[0070] Fig. 5 is a flowchart showing the control process of the V2H device 6 shown in Fig. 4. When the controller 62 detects that the plug P1 of the cable CBL1 is attached to the receptacle R1 of the vehicle V1 and that wired communication has been established between the communication unit 64 and the communication unit 74, the controller 62 starts the control process shown in Fig. 5. The controller 62 also starts the control process shown in Fig. 5 when it detects that the communication unit 64 has received a reset signal output from the distribution board 3 when the power outage is resolved.

[0071] In step S21, the controller 62 performs charging, power supply, or standby in accordance with a control sequence defined in the program 631. In the case of charging, the controller 62 causes the bidirectional AC / DC converter 61 to perform a power conversion operation of converting AC power to DC power, and instructs the charge / discharge device 7 to cause the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of a first voltage value to DC power of a second voltage value. In the case of power supply, the controller 62 causes the bidirectional AC / DC converter 61 to perform a power conversion operation of converting DC power to AC power, and instructs the charge / discharge device 7 to cause the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of a second voltage value to DC power of a first voltage value. In the case of standby, the controller 62 stops the power conversion operation of the bidirectional AC / DC converter 61, and instructs the charge / discharge device 7 to stop the power conversion operation of the bidirectional DC / DC converter 71.

[0072] During the processing of step S21, the controller 62 determines whether or not a power outage has occurred in the residence H1 (step S22). For example, in this determination, the controller 62 may determine that a power outage has occurred in the residence H1 if it detects that the communication unit 64 has received a power outage notification signal that is output from the distribution board 3 when a power outage occurs. If it is determined that a power outage has occurred in the residence H1, the controller 62 proceeds to the processing of step S23.

[0073] In step S23, the controller 62 supplies power. That is, the controller 62 causes the bidirectional AC / DC converter 61 to perform a power conversion operation of converting DC power into AC power, and instructs the charge / discharge device 7 to cause the bidirectional DC / DC converter 71 to perform a power conversion operation of converting DC power of the second voltage value into DC power of the first voltage value.

[0074] During the processing of step S23, the controller 62 determines whether the remaining charge of the battery B1 is equal to or less than the threshold value 632 (step S24). For example, in this determination, the controller 62 may monitor the second voltage value described above via the charge / discharge device 7 and calculate the remaining charge of the battery B1 from the second voltage value. If it is determined that the remaining charge of the battery B1 is equal to or less than the threshold value 632, the process proceeds to step S25.

[0075] In step S25, the controller 62 determines whether or not the first condition is met. If it is determined that the first condition is not met, the process proceeds to step S26. On the other hand, if it is determined that the first condition is met, the process proceeds to step S28.

[0076] In step S26, the controller 62 determines whether or not the second condition is met. If it is determined that the second condition is not met, the process proceeds to step S27. On the other hand, if it is determined that the second condition is met, the process proceeds to step S28.

[0077] In step S27, the controller 62 determines whether or not the third condition is met. If it is determined that the third condition is not met, the process proceeds to step S29. On the other hand, if it is determined that the third condition is met, the process proceeds to step S28.

[0078] That is, if at least one of the first to third conditions is met, the process proceeds to step S28, and if none of the first to third conditions is met, the process proceeds to step S29.

[0079] The first condition is when a current equal to or greater than a threshold current is drawn from battery B1, for example, when a current greater than the standby current is drawn from battery B1. The value of the current drawn from battery B1 is detected by current detection unit 65.

[0080] The second condition is when current is being drawn from the emergency outlet 5 provided in the residence H1. The distribution board 3 has a built-in current detection unit that detects whether current is being drawn from the emergency outlet 5. When current is being drawn from the emergency outlet 5, the controller 62 receives, via the communication unit 64, an emergency outlet use notification signal (a signal indicating that the second condition is met) output from the residence H1 (more specifically, the distribution board 3).

[0081] The controller 62 can easily determine whether the second condition is met by receiving from the house H1 a signal indicating that the second condition is met.

[0082] The third condition is that the time until the scheduled start time of vehicle V1 is equal to or greater than threshold time 635. In this embodiment, controller 62 estimates the scheduled start time of vehicle V1 based on timer charging schedule 634 for battery B1. For example, controller 62 may estimate the charging end time of timer charging schedule 634 as the scheduled start time of vehicle V1.

[0083] The controller 62 can easily determine whether the third condition is met by estimating the scheduled start time of the vehicle V1 based on the timer charging schedule 634 for the battery B1.

[0084] The first to third conditions are conditions under which it is assumed that power supply to the house H1 takes priority over maintaining the remaining charge of the battery B1.

[0085] In step S28, the controller 62 continues to supply power to the house H1 until the remaining charge of the battery B1 is depleted. In step S29, the controller 62 stops the supply of power to the house H1. When the processing of step S28 or step S29 ends, the controller 62 ends the control of the flow shown in FIG. 5.

[0086] According to the control flow shown in Fig. 5, if any of the first to third conditions is met, power supply to the house H1 continues until the remaining charge of the battery B1 is depleted. This makes it possible to more reliably make maximum use of the battery B1 as an emergency power source in the event of a disaster.

[0087] Furthermore, according to the control flow shown in FIG. 5, when a power outage occurs in the house H1, external power is supplied to the house H1, so that the battery B1 can be used as an emergency power source in the event of a power outage in the house H1.

[0088] <Notes, etc.> Various technical features disclosed in the description of the present invention may be modified in various ways without departing from the spirit of the technical creation. Furthermore, multiple embodiments and modifications disclosed in the description of the present invention may be combined to the extent possible.

[0089] For example, in the first configuration example of the V2H device 6 and the charging / discharging device 7 shown in Fig. 2, the charging / discharging device 7 is provided with a current detection unit 75, but a current detection unit may be provided in the V2H device 6 and the detection result of the current detection unit may be transmitted from the communication unit 64 to the communication unit 74. In other words, the V2H device 6 may be responsible for part of the processing performed by the charging / discharging device 7 in the above-mentioned embodiment. Conversely, the charging / discharging device 7 may be responsible for part of the processing performed by the V2H device 6 in the above-mentioned embodiment.

[0090] In the above-described embodiment, a determination was made as to whether each of the first to third conditions is met, but a determination may also be made as to whether any two of the first to third conditions are met, or a determination may also be made as to whether any one of the first to third conditions is met.

[0091] Furthermore, a determination may be made as to whether or not a condition other than the first to third conditions is met. The conditions other than the first to third conditions may be, like the first to third conditions, any conditions that are assumed to indicate that power supply to the house H1 is given priority over maintaining the remaining charge of the battery B1. For example, as in Patent Document 1, a determination may be made as to whether or not a fourth condition, that is, information about the occurrence of a disaster has been acquired from a data center or the like, is met, and if the fourth condition is met, power supply to the house H1 may be continued until the remaining charge of the battery B1 is depleted.

[0092] In the above-described embodiment, the V2H device 6 is configured to perform power conversion to convert AC power to DC power and power conversion to convert DC power to AC power, but the charging / discharging device 7 provided in the vehicle V1 may be configured to perform power conversion to convert AC power to DC power and power conversion to convert DC power to AC power. [Explanation of symbols]

[0093] 6 V2H equipment 7 Charging / discharging device 62, 72 Controller B1 Battery H1 Housing V1 vehicle

Claims

1. A power supply device that performs external power supply to supply power from a battery mounted on a vehicle to an outside of the vehicle, When the remaining charge of the battery becomes equal to or less than a threshold value while the external power supply is being performed, the power supply is stopped; a controller that continues power supply when at least one of a first condition, a second condition, and a third condition is met even when the remaining charge of the battery becomes equal to or less than the threshold; the first condition is that a current equal to or greater than a threshold current is drawn from the battery; the second condition is that a current is being drawn from an emergency outlet provided outside the vehicle, the third condition is that the time until the scheduled start time of the vehicle is equal to or longer than a threshold time; Power supply device.

2. The power supply device according to claim 1 , wherein, when a power outage occurs in a house, the power supply device performs the external power supply to supply power to the house.

3. The emergency outlet is provided in the residence, The power supply device according to claim 2 , wherein the controller receives a signal from the house indicating that the second condition is met.

4. The power supply device according to claim 1 , wherein the controller estimates the scheduled time when the vehicle will start traveling based on a timer-based charging schedule for the battery.

5. 1. A computer-implemented power supply method for supplying power from a battery mounted on a vehicle to an external device of the vehicle, the method comprising: When the remaining charge of the battery becomes equal to or less than a threshold value while the external power supply is being performed, the power supply is stopped; Even if the remaining charge of the battery becomes equal to or less than the threshold, power supply is continued if at least one of a first condition, a second condition, and a third condition is met. the first condition is that a current equal to or greater than a threshold current is drawn from the battery; the second condition is that a current is being drawn from an emergency outlet provided outside the vehicle, the third condition is that the time until the scheduled start time of the vehicle is equal to or longer than a threshold time; Power supply method.

6. A program for external power supply that supplies power from a battery mounted on a vehicle to an outside of the vehicle, the program being executed by a computer, When the remaining charge of the battery becomes equal to or less than a threshold value while the external power supply is being performed, the power supply is stopped; Even if the remaining charge of the battery becomes equal to or less than the threshold, power supply is continued if at least one of a first condition, a second condition, and a third condition is met. the first condition is that a current equal to or greater than a threshold current is drawn from the battery; the second condition is that a current is being drawn from an emergency outlet provided outside the vehicle, the third condition is that the time until the scheduled start time of the vehicle is equal to or longer than a threshold time; program.

Images