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

Abstract

To realize both mobility application of a vehicle with an on-vehicle storage battery and storage battery application.SOLUTION: A charge / discharge control which controls charging from a DC power supply to an on-vehicle storage battery and discharging from the on-vehicle storage battery to a load, includes: a target SOC acquisition unit for acquiring a target SOC indicating an SOC of the on-vehicle storage battery at target time; a target time acquisition unit for acquiring the target time; a calculation unit for calculating a charging start time which is a point in time at which charging to the on-vehicle storage battery is started on the basis of the target SOC and the target time; a present time acquisition unit for acquiring a present point in time; and a control unit for comparing the acquired present point in time and the calculated charging start time, controlling to start charging when it becomes the charging start time and controlling to stop charging when SOC of the on-vehicle storage battery is determined to reach the target SOC.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a charge / discharge control device, a program, and a charge / discharge control method. [Background technology]

[0002] Conventionally, in the technical field of controlling the distribution of electricity generated by a solar power generation system installed in a house, a technology is known that controls the supply of surplus electricity shared among loads in the house to an on-board storage battery installed in a vehicle (see, for example, Patent Document 1). Furthermore, there is a known technology for supplying power stored in an on-board storage battery to residential loads during nighttime or other times when power cannot be obtained from solar power generation. One such technology, in particular, sets a lower limit for the State of Charge (SOC) and controls the SOC of the on-board storage battery so that it does not fall below the set lower limit (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-031484 [Patent Document 2] Japanese Patent Publication No. 2020-018120 Summary of the Invention [Problem to be solved by the invention]

[0004] When using the above-mentioned technology, setting the SOC lower limit low widens the SOC range in which the battery can be charged and discharged, but there is a problem that the vehicle cannot travel long distances if the vehicle is driven in a low SOC state. Setting the SOC lower limit high also ensures an SOC that allows long-distance travel, but narrows the SOC range in which the battery can be charged and discharged. Frequent changes to the SOC lower limit also complicate operations, impairing usability. In other words, with conventional technology, it is difficult to use a vehicle equipped with an on-board storage battery for both mobility and storage battery purposes.

[0005] Therefore, an object of the present invention is to provide suitable control so that a vehicle equipped with an on-board storage battery can be used for both mobility and storage battery purposes. [Means for solving the problem]

[0006] An inverter charge / discharge control device according to one aspect of the present invention is a charge / discharge control device that controls charging of an on-board storage battery from a DC power supply and discharging of the on-board storage battery to a load, and includes a target SOC acquisition unit that acquires a target SOC that indicates the SOC of the on-board storage battery at a target time, a target time acquisition unit that acquires the target time, and a charge start time that is a time to start charging the on-board storage battery based on the target SOC and the target time. , at predetermined regular time intervals so as to complete charging by the target time. a current time acquisition unit that acquires the current time; and a control unit that compares the acquired current time with the calculated charging start time, controls to start charging when the charging start time arrives, and controls to stop charging when it is determined that the SOC of the on-board storage battery has reached the target SOC.

[0007] In addition, a charge / discharge control device according to one embodiment of the present invention further includes an SOC lower limit value acquisition unit that acquires a lower limit value of the SOC of the vehicle storage battery when discharging from the vehicle storage battery to a load, and the control unit controls the discharge from the vehicle storage battery to the load to stop when the SOC of the vehicle storage battery reaches the lower limit value.

[0008] In addition, in a charge / discharge control device according to one embodiment of the present invention, the calculation unit calculates the charging start time based on the difference between the current SOC of the vehicle storage battery and the target SOC, and the charging power, which is the rate at which the vehicle storage battery is charged.

[0009] In a charge / discharge control device according to an aspect of the present invention, the charging power is a constant value, and the calculation unit calculates the charging start time based on the charging power that is set in advance.

[0010] In addition, in a charge / discharge control device according to one embodiment of the present invention, the calculation unit learns the charging power based on the charging time and charge amount required to charge the on-board storage battery, and calculates the charging start time based on the learned charging power.

[0011] Moreover, the charge / discharge control device according to one aspect of the present invention further includes a notification unit that notifies whether the charge power calculated by the calculation unit is equal to or less than a predetermined rated charge power.

[0012] In addition, a charge / discharge control device according to one embodiment of the present invention further includes a charge priority time period acquisition unit that acquires a charge priority time period, and the control unit controls charging to start during the acquired charge priority time period regardless of the charging start time.

[0013] In addition, in a charge / discharge control device according to one embodiment of the present invention, the DC power source is a solar cell that converts light energy into DC power, and the control unit determines the direction of the current flow based on sensor output information acquired by a current sensor that acquires information about the power supplied from a grid power source to a load or the power supplied from the DC power source to the grid power.

[0014] Furthermore, in a charge / discharge control device according to one embodiment of the present invention, the control unit prioritizes charging from the solar cell to the on-board storage battery when the time is not within the charge priority time period, the charge start time has not been reached, and the direction of the power flow indicated in the sensor output information is reverse power flow to the grid power, and prioritizes discharging of the on-board storage battery when the time is not within the charge priority time period, the charge start time has not been reached, and the direction of the power flow indicated in the sensor output information is forward power flow from the grid power.

[0015] A program according to one aspect of the present invention includes a target SOC acquisition step of acquiring a target SOC indicating an SOC of the vehicle-mounted storage battery at a target time, a target time acquisition step of acquiring the target time, and a charging start time of starting charging of the vehicle-mounted storage battery based on the target SOC and the target time. , at predetermined regular time intervals so as to complete charging by the target time. a current time acquisition step of acquiring the current time; and a control step of comparing the acquired current time with the calculated charging start time, controlling to start charging when the charging start time arrives, and controlling to stop charging when it is determined that the SOC of the vehicle storage battery has reached the target SOC.

[0016] A charge / discharge control method according to one aspect of the present invention is a charge / discharge control method for controlling charging of an on-board storage battery from a DC power supply and discharging from the on-board storage battery to a load, the charge / discharge control method including a target SOC acquisition step of acquiring a target SOC indicating an SOC of the on-board storage battery at a target time, a target time acquisition step of acquiring the target time, and a charge start time, which is a time to start charging the on-board storage battery, based on the target SOC and the target time. , at predetermined regular time intervals so as to complete charging by the target time. a current time acquisition process for acquiring the current time; and a control process for comparing the acquired current time with the calculated charging start time, controlling to start charging when the charging start time arrives, and controlling to stop charging when it is determined that the SOC of the on-board storage battery has reached the target SOC. [Effects of the Invention]

[0017] According to the present invention, it is possible to achieve both mobility applications and storage battery applications for a vehicle equipped with an on-board storage battery. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a diagram showing an overview of a charge / discharge system according to a first embodiment. [Figure 2] FIG. 3 is a diagram for explaining an example of the operation of the charge / discharge control device according to the first embodiment. [Figure 3] 1 is a diagram illustrating an example of a functional configuration of a charge / discharge control device according to a first embodiment. [Figure 4] FIG. 4 is a diagram showing an example of a user request acquisition screen according to the first embodiment. [Figure 5] 4 is a flowchart showing an example of the operation of the charge / discharge control device according to the first embodiment. [Figure 6] 5 is a diagram for explaining the relationship between a target time and a charge / discharge operation according to the first embodiment. FIG. [Figure 7] FIG. 4 is a diagram showing an example of the relationship between the amount of PV power generation, the amount of V2H charge and discharge, and the amount of power consumption in the home according to the first embodiment. [Figure 8] FIG. 6 is a diagram illustrating an example of a functional configuration of a charge / discharge control device according to a second embodiment. [Figure 9] FIG. 11 is a diagram showing an example of a user request acquisition screen according to the second embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of a functional configuration of a charge / discharge control device according to a third embodiment. [Figure 11] FIG. 10 is a diagram illustrating an example of a functional configuration of a charge / discharge control device according to a fourth embodiment. [Figure 12] FIG. 13 is a diagram showing an example of a user request acquisition screen according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0020] [First embodiment] First, the first embodiment will be described with reference to FIGS. 1 is a diagram showing an outline of a charge / discharge system according to the first embodiment, and the outline of the charge / discharge system 1 will be described with reference to the diagram. The charge / discharge system 1 includes a charge / discharge control device 10, a house 20, a vehicle 31, a storage battery 41, and a grid power 62. The house 20 includes a solar panel 21 and a load 57. The charge / discharge system 1 supplies power generated by the solar panel 21 to at least one of the load 57, the storage battery 41, and the vehicle 31. The charge / discharge system 1 also supplies power from the grid power 62 to at least one of the load 57 and the vehicle 31. The charge / discharge system 1 also supplies power from at least one of the vehicle 31 and the storage battery 41 to the load 57.

[0021] The solar panel 21 is connected to the charge / discharge control device 10 via a connection box 22 . The solar panel 21 is configured to include a plurality of cells. Each of the plurality of cells converts sunlight emitted from the sun into DC power. The solar panel 21 supplies the converted DC power to at least one of the load 57, the grid power 62, the storage battery 41, and the vehicle 31 via the connection box 22. In other words, the solar panel 21 is a DC power source that converts light energy such as sunlight into DC power and supplies the converted DC power. In the following description, the solar panel 21 may also be referred to as a solar cell.

[0022] The solar panel 21 may be any current source capable of supplying power, and other renewable energy sources such as wind power generation, hydroelectric power generation, and geothermal power generation may be used instead of the solar panel 21.

[0023] The storage battery 41 stores the power supplied from the solar panel 21 and discharges the stored power to the load 57 . The amount of power generated by the solar panel 21 is greatly affected by the weather of the day. Therefore, the charging / discharging system 1 stores and discharges power by including a storage battery 41 together with the solar panel 21. The storage battery 41 stores surplus power generated by the solar panel 21 and discharges it to the load 57 when the output from the solar panel 21 is low or during the nighttime hours, etc. The charging / discharging system 1 includes the storage battery 41, thereby preventing a drop in the voltage supplied to the load 57.

[0024] The vehicle 31 includes an on-board storage battery 311. The on-board storage battery 311 stores DC power. The vehicle 31 runs using the DC power stored in the on-board storage battery 311 as an energy source. That is, the vehicle 31 may be an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV). Specifically, the in-vehicle storage battery 311 stores the power generated by the solar panel 21 via the DC link V2H32. The in-vehicle storage battery 311 also stores the power supplied from the grid power 62 via the DC link V2H32.

[0025] During the time periods when the vehicle 31 is not being used as a vehicle, the in-vehicle storage battery 311 functions as a battery having the same function as the storage battery 41. That is, the in-vehicle storage battery 311 stores surplus power generated by the solar panel 21, and discharges the power to the load 57 when the output from the solar panel 21 is low or during the nighttime hours, etc.

[0026] The house 20 includes a grid-connected breaker 51 , a switching box 52 , an audio monitor 53 , a distribution board 54 , a current sensor 55 , a router 56 , and a load 57 . The grid-connection breaker 51 is used to connect the solar panel 21 to the distribution board 54. The grid-connection breaker 51 is also used to connect the grid power 62 to the distribution board 54 via the smart meter 61. The switching box 52 switches between a grid-connected state and an independent operation state. The audio monitor 53 displays the amount of power generated by the solar panel 21 and the amount of power used in the house 20, and provides audio guidance. The distribution board 54 distributes power to the loads 57. The distribution board 54 has the function of a ground fault breaker that cuts off the loads if a ground fault occurs in any of the loads. The current sensor 55 acquires information about the power supplied from the grid power 62 to the load 57 or the power supplied from the solar panel 21 to the grid power 62. In other words, the direction of power flow can be determined based on the sensor output information of the current sensor 55.

[0027] The router 56 is connected to a mobile terminal device 71 via a predetermined communication network NW. The mobile terminal device 71 may be an electronic device such as a smartphone or a tablet terminal. The router 56 communicates with the audio monitor 53, the storage battery 41, and the DC link V2H32 via the charge / discharge control device 10. By providing these communication networks, the charge / discharge system 1 can operate the settings of the charge / discharge control from the mobile terminal device 71.

[0028] Specifically, the load 57 includes a 100V load 571 and a 200V load 572. The 100V load 571 is a load driven by 100V AC. Examples of the 100V load 571 include a refrigerator, a washing machine, a television, an air conditioner, a light bulb, etc. The 200V load 572 is a load driven by 200V AC. Examples of the 200V load 572 include an air conditioner, an induction cooker, etc.

[0029] 2 is a diagram illustrating an example of the operation of the charge / discharge control device according to the first embodiment. An example of the operation of the charge / discharge control device 10 will be described with reference to the diagram. The charge / discharge control device 10 monitors the power flow using a current sensor 55. If the power flow is a reverse power flow toward the grid power, it determines that there is surplus solar-generated power, and charges the in-vehicle storage battery 311. If the power flow is a forward power flow from the grid power, it determines that the solar-generated power is insufficient for the in-house load, and discharges the power from the in-vehicle storage battery 311 to the in-house distribution board 54.

[0030] The power supply changeover switch 11 includes a normal terminal 111, an isolated terminal 112, and a load side terminal 113. The power supply changeover switch 11 switches the connection between either the normal terminal 111 and the load side terminal 113, or the isolated terminal 112 and the load side terminal 113. The load side terminal 113 is connected to the distribution board 54. The load side terminal 113 is also connected to the solar panel 21 via a power conditioner (PV power conditioner) 23.

[0031] The normal terminal 111 is connected to the grid power 62 via a main breaker 63. A current sensor 55 is connected between the power supply changeover switch 11 and the main breaker 63. The current sensor 55 detects the current flowing between the main breaker 63 and the power supply changeover switch 11. When the power supply changeover switch 11 establishes electrical continuity between the normal terminal 111 and the load side terminal 113 , power is supplied from the grid power 62 to the load 57 , or power is supplied from the solar panel 21 to the grid power 62 .

[0032] The self-sustaining terminal 112 is connected to the AC link type V2H 33. The AC link type V2H 33 is connected to the in-vehicle storage battery 311. When the power supply changeover switch 11 establishes electrical continuity between the independent terminal 112 and the load side terminal 113, power is supplied from the vehicle-mounted storage battery 311 to the load 57, or power is supplied from the solar panel 21 to the vehicle-mounted storage battery 311.

[0033] 3 is a diagram showing an example of the functional configuration of the charge / discharge control device according to the first embodiment. With reference to the diagram, an example of the functional configuration of the charge / discharge control device 10 will be described. The charge / discharge control device 10 includes a target SOC acquisition unit 110, a target time acquisition unit 120, a calculation unit 130, a current time acquisition unit 140, and a control unit 150. The charge / discharge control device 10 may be included inside the AC link type V2H33.

[0034] When the vehicle 31 is used for mobility purposes, it is desirable that the SOC (State Of Charge) of the in-vehicle storage battery 311 is equal to or greater than a predetermined value when the user uses the vehicle 31 for mobility purposes (i.e., when the user gets into the vehicle 31). In other words, it is desirable that the SOC of the in-vehicle storage battery 311 is equal to or greater than a target SOC at a target time. Therefore, the charge / discharge control device 10 acquires the target time and the target SOC from the user, and controls the charge / discharge of the in-vehicle storage battery 311 so that the SOC is equal to or greater than the target SOC at the target time. Specifically, if the target time is 7:00 and the target SOC is 70%, the charge / discharge control device 10 controls the charge / discharge of the in-vehicle storage battery 311 so that the SOC of the in-vehicle storage battery 311 is equal to or greater than the target SOC at 7:00 every day.

[0035] The target time indicates the time when the user plans to start using the vehicle 31 for mobility purposes, and the target SOC indicates a target value of the SOC of the in-vehicle storage battery 311 at the target time.

[0036] The target SOC acquisition unit 110 acquires a target SOC. The target time acquisition unit 120 acquires a target time. Information including the target SOC is also referred to as target SOC information IS. Information including the target time is also referred to as target time information IT. The target SOC acquisition unit 110 outputs the target SOC information IS to the calculation unit 130. The target time acquisition unit 120 outputs the target time information IT to the calculation unit 130.

[0037] 4 is a diagram showing an example of a user request acquisition screen according to the first embodiment. An example of the user request acquisition screen D10 will be described with reference to the same figure. The charge / discharge control device 10 acquires a target SOC and a target time from a user using the user request acquisition screen D10. The user request acquisition screen D10 may be displayed on a display unit (not shown) included in the charge / discharge control device 10, or on a display unit of another device such as a mobile terminal device 71.

[0038] The user request acquisition screen D10 includes a text box D11 and a text box D12 as screen components. The user inputs information in the text box D11 using a predetermined method to acquire a target SOC. The user inputs information in the text box D12 using a predetermined method to acquire a target time.

[0039] For example, the user inputs the target SOC and target time using an input device such as a keyboard or a voice input device such as a microphone. The user request acquisition screen D10 also displays predetermined options, allowing the user to input the target SOC and target time by selecting the desired target SOC and target time from the displayed options.

[0040] 3, the calculation unit 130 acquires the target SOC information IS from the target SOC acquisition unit 110 and acquires the target time information IT from the target time acquisition unit 120. The calculation unit 130 calculates the charging start time based on the target SOC included in the acquired target SOC information IS and the target time included in the target time information IT. The charging start time is the time to start charging the in-vehicle storage battery 311. Information including the charging start time is also referred to as charging start time information IST. The calculation unit 130 outputs the charging start time information IST to the control unit 150.

[0041] The current time acquiring unit 140 acquires the current time. Information including the current time is also referred to as current time information RT. The current time acquiring unit 140 outputs the current time information RT to the control unit 150.

[0042] The control unit 150 acquires charging start time information IST from the calculation unit 130 and acquires current time information RT from the current time acquisition unit 140. The control unit 150 compares the current time included in the acquired current time information RT with the charging start time included in the charging start time information IST, and when the charging start time arrives, controls the in-vehicle storage battery 311 to start charging from the solar panel 21 or the grid power 62. The control unit 150 also acquires information related to the current SOC of the in-vehicle storage battery 311 and compares the current SOC with a target SOC. When the control unit 150 determines that the current SOC of the in-vehicle storage battery 311 has reached the target SOC, it controls the charging to stop.

[0043] 5 is a flowchart showing an example of the operation of the charge / discharge control device according to the first embodiment. With reference to this figure, an example of the operation of the charge / discharge control device 10 will be described.

[0044] (Step S110) The user sets the "daytime electricity rate time zone" and the "nighttime electricity rate time zone" using a predetermined method. Based on the user's settings, the charge / discharge control device 10 acquires information about the "daytime electricity rate time zone" and the "nighttime electricity rate time zone."

[0045] The "daytime electricity rate time period" is a time period in which the daytime electricity rate is applied when purchasing electricity from the grid power 62. The "nighttime electricity rate time period" is a time period in which the nighttime electricity rate applies when purchasing electricity from the grid power 62. Generally, electricity rates differ between "daytime electricity rate time zones" and "nighttime electricity rate time zones." In particular, electricity rates are lower during "nighttime electricity rate time zones," when electricity usage is low, than during "daytime electricity rate time zones."

[0046] (Step S120) The user sets the "target SOC" and "target time" using a predetermined method. Based on the user's settings, the charge / discharge control device 10 acquires information about the "target SOC" and "target time." Specifically, the target SOC acquisition unit 110 acquires target SOC information IS, and the target time acquisition unit 120 acquires target time information IT.

[0047] Note that the operation shown in step S110 may be performed less frequently than the operation shown in step S120. For example, in a user interface operated by a user, the setting items shown in step S110 are located at a deeper level than the setting items shown in step S120. This configuration allows the user to set the setting items shown in step S120 more easily than the setting items shown in step S110.

[0048] (Step S130) The calculation unit 130 calculates the charging start time based on the "target time" and "target SOC" acquired in step S120. Specifically, the charge / discharge control device 10 acquires the "current SOC" that is the current SOC of the in-vehicle storage battery 311, and calculates the charging start time from the "target time," "current SOC," "target SOC," and "rated charging power." The "rated charging power" is a value determined according to the in-vehicle storage battery 311, and may be stored in advance in the charge / discharge control device 10.

[0049] The charging start time may be calculated at predetermined intervals, such as every three hours or every hour. Furthermore, the calculation unit 130 may calculate the charging start time at predetermined regular time intervals, and may also calculate the time when the vehicle 31 is reconnected to the DC link V2H32.

[0050] The calculation unit 130 may further calculate the charging start time based on the charging power (kW). The charging power (kW) is the rate at which the in-vehicle storage battery 311 is charged. When the calculation unit 130 calculates the charging start time based on the charging rate, the calculation unit 130 calculates the charging start time based on the difference between the current SOC and the target SOC of the in-vehicle storage battery 311 and the charging power.

[0051] Here, the charging power may be a predetermined constant value. When the charging power is a predetermined constant value, the calculation unit 130 calculates the charging start time based on the predetermined charging power.

[0052] As a modified example, the charge / discharge control device 10 may be configured to learn the charge power. In this case, the charge / discharge control device 10 learns the charge power using a machine learning algorithm. The machine learning algorithm may learn the charge power through supervised learning using the charging time required to charge the in-vehicle storage battery 311 and the charge amount as training data. The machine learning algorithm may be included in the calculation unit 130. In other words, the calculation unit 130 learns the charging power based on the charging time and charge amount required to charge the in-vehicle storage battery 311, and calculates the charging start time based on the learned charging power.

[0053] (Step S140) Control unit 150 determines whether the charging start time calculated in step S130 has arrived. If control unit 150 determines that the charging start time has arrived (i.e., step S140; YES), control unit 150 proceeds to step S150. If control unit 150 determines that the charging start time has not arrived (i.e., step S140; NO), control unit 150 proceeds to step S160.

[0054] (Step S150) The charge / discharge control device 10 charges the in-vehicle storage battery 311 with the rated charging power. The charge / discharge control device 10 stops charging when the in-vehicle storage battery 311 reaches the "target SOC". In addition, if there is power generated by the solar panel 21 that cannot be consumed by the load 57, the charge / discharge control device 10 may charge the in-vehicle storage battery 311 even if the power exceeds the "target SOC." The charge / discharge control device 10 advances the process to step S130.

[0055] In the following description, the power generated by the solar panel 21 that cannot be consumed by the load 57 may also be referred to as "PV surplus." Furthermore, when a PV surplus occurs, the surplus power may also be referred to as "PV surplus." In addition, even if the power generated by the solar panel 21 is used, the case where the power consumed by the load 57 is insufficient may also be referred to as a "PV shortage." In addition, when a PV shortage occurs, the insufficient power may also be referred to as a "PV shortage."

[0056] (Step S160) The control unit 150 determines whether or not it is within the daytime rate time zone, based on the current time acquired by the current time acquisition unit 140. If the control unit 150 determines that it is within the daytime rate time zone (i.e., step S160; YES), the control unit 150 proceeds to step S170. If the control unit 150 determines that it is not within the daytime rate time zone (i.e., step S160; NO), the control unit 150 proceeds to step S180.

[0057] (Step S170) Until the start of the "nighttime electricity rate period," the charge / discharge control device 10 monitors the power flow in the house from the sensor output information of the current sensor 55. Specifically, the control unit 150 determines the direction of the power flow based on the sensor output information acquired by the current sensor 55. When there is a PV surplus, the charge / discharge control device 10 charges the in-vehicle storage battery 311. When the power consumed by the load 57 exceeds the power generated by the solar panel 21 (i.e., when there is a PV shortage), the charge / discharge control device 10 discharges power from the in-vehicle storage battery 311 to the load 57. The charge / discharge control device 10 advances the process to step S130.

[0058] (Step S180) The charge / discharge control device 10 charges the in-vehicle storage battery 311 with rated power. When the SOC of the in-vehicle storage battery 311 reaches the "target SOC", the charge / discharge control device 10 stops charging the in-vehicle storage battery 311. When charging the in-vehicle storage battery 311, the charge / discharge control device 10 uses the PV surplus if there is a PV surplus, and charges from the grid power 62 if there is no PV surplus. The charge / discharge control device 10 advances the process to step S130.

[0059] 6 is a diagram for explaining the relationship between the target time and the charge / discharge operation according to the first embodiment. The relationship between the target time and the charge / discharge operation will be explained with reference to the diagram. In the figure, the horizontal axis represents time, and the operation of the charge / discharge control device 10 in the morning, afternoon, evening, and late night is shown. The electricity rates in the morning, afternoon, and evening are daytime rates, and the electricity rate in the late night is nighttime rates. As an example, the figure shows the operation over two days when the target SOC and target time are set on the morning of the first day. The figure also shows the operation when the target time is set to morning and when it is set from afternoon to night.

[0060] First, an example in which the target time is set to morning will be described. At time t1, the user sets a target SOC and a target time. Specifically, the target SOC acquisition unit 110 acquires target SOC information IS, and the target time acquisition unit 120 acquires target time information IT. The calculation unit 130 calculates the charging start time based on the acquired target SOC acquisition unit 110 and target SOC information IS. The control unit 150 compares the calculated charging start time with the current time acquired by the current time acquisition unit 140, and determines whether the charging start time has arrived.

[0061] During the time period up to time t4, the charge / discharge control device 10 charges the in-vehicle storage battery 311 if there is a PV surplus. Furthermore, during the period up to time t4, the user may or may not use the vehicle 31 for mobility purposes. When the user uses the vehicle 31 for mobility purposes, the in-vehicle storage battery 311 is again connected to the charge / discharge control device 10 in a state where the remaining SOC decreases with use. If there is a PV surplus, the charge / discharge control device 10 charges the in-vehicle storage battery 311.

[0062] At time t4, the control unit 150 determines that it is time to start charging. Because it is time to start charging, the control unit 150 starts charging the in-vehicle storage battery 311. Although the time period falls within the nighttime rate period (i.e., electricity rates are low), the control unit 150 does not necessarily charge the in-vehicle storage battery 311 until its SOC reaches 100%, but charges it up to a target SOC. By not charging the in-vehicle storage battery 311 until its SOC reaches 100%, the charge / discharge control device 10 ensures a fatigue region where charging is performed using surplus PV.

[0063] At time t5, which is the target time, the SOC of the in-vehicle storage battery 311 reaches the target SOC. After that, if there is a PV surplus, the charge / discharge control device 10 charges the in-vehicle storage battery 311.

[0064] During the period up to time t8, the user may or may not use the vehicle 31 for mobility purposes. When the user uses the vehicle 31 for mobility purposes, the in-vehicle storage battery 311 is again connected to the charge / discharge control device 10 in a state where the remaining SOC decreases with use. If there is a PV surplus, the charge / discharge control device 10 charges the in-vehicle storage battery 311.

[0065] At time t8, the control unit 150 again determines that the charging start time has arrived. Since the charging start time has arrived, the control unit 150 starts charging the in-vehicle storage battery 311. Thereafter, the same processing as on the first day is repeated.

[0066] Next, an example of the case where the target time is set from noon to night will be described. In the example of the case where the target time is set to late at night, the contents already explained in the example of the case where the target time is set to morning may be omitted.

[0067] At time t2, the control unit 150 determines that the charging start time has arrived. Because the charging start time has arrived, the control unit 150 starts charging the in-vehicle storage battery 311. The relevant time period is a daytime rate period (i.e., electricity rates are high). Therefore, the control unit 150 charges the in-vehicle storage battery 311 with power generated by the solar panel 21 if possible, and charges the in-vehicle storage battery 311 from the grid power 62 if there is a PV shortage.

[0068] Specifically, the charge / discharge control device 10 monitors the current flow in the house 20 using a current sensor 55, and if there is a PV surplus, it charges the vehicle-mounted storage battery 311 with the power generated by the solar panel 21. If there is a PV shortage, it charges the vehicle-mounted storage battery 311 from the grid power 62.

[0069] At time t3, which is the target time, the SOC of the vehicle-mounted storage battery 311 reaches the target SOC. After that, if there is a PV surplus, the charge / discharge control device 10 charges the vehicle-mounted storage battery 311.

[0070] In addition, the setting of the target SOC and target time in this embodiment is a mechanism for using the on-board storage battery 311 as a storage battery until getting into the vehicle 31 (i.e., the period when the vehicle 31 is not being used for mobility purposes), and therefore, as a general rule, it is not recommended to set the target time during the daytime to nighttime hours. When the target time is set to a time period from daytime to nighttime, the control in this embodiment may not be used, and a full charge mode may be used in which the in-vehicle storage battery 311 is forcibly charged until its SOC reaches 100%.

[0071] 7 is a diagram showing an example of the relationship between the PV power generation amount, the V2H charge / discharge amount, and the home power consumption amount according to the first embodiment. With reference to the diagram, an example of the time-dependent changes in the PV power generation amount, the V2H charge / discharge amount, the home power consumption amount, and the SOC of the in-vehicle storage battery 311 will be described. FIG. 7(A) shows an example of the change over time in the amount of PV power generation, the amount of V2H charge and discharge, and the amount of power consumed in the home, and FIG. 7(B) explains an example of the change over time in the SOC of the in-vehicle storage battery 311, with the horizontal axis representing time.

[0072] Between 7:00 and 9:00, the in-home consumption exceeds 2 [KW (kilowatts)], which is large. Therefore, there is a PV shortage, and the in-vehicle storage battery 311 discharges to the load 57, and the SOC of the in-vehicle storage battery 311 decreases from 66% to 63%.

[0073] When the in-home consumption falls to 1 [KW] between 9:00 and 16:00, a PV surplus occurs, and the charge / discharge control device 10 charges the in-vehicle storage battery 311. Between 9:00 and 16:00, the SOC of the in-vehicle storage battery 311 increases from 65% to 84%.

[0074] Between 4:00 PM and midnight, the in-home consumption again exceeds 2 [KW] and increases. After sunset, the amount of power generated by the solar panel 21 drops to zero, and the in-vehicle storage battery 311 begins discharging again. Between 4:00 PM and midnight, the SOC of the in-vehicle storage battery 311 decreases from 82% to 50%.

[0075] From midnight to 5:00, in-house consumption is 0 [KW]. From midnight to 1:00, no charging or discharging takes place.

[0076] At 1:00, the charging start time has arrived, and the charge / discharge control device 10 starts charging the vehicle-mounted storage battery 311. Since this time period is a nighttime electricity rate period, charging can be performed at a low electricity rate even if power is supplied from the grid power 62. Between 1:00 and 5:00, the charge / discharge control device 10 charges the vehicle-mounted storage battery 311 until the target SOC is reached. Between 1:00 and 5:00, the SOC of the vehicle-mounted storage battery 311 increases from 55% to 70%. That is, in this example, the target SOC is 70% and the target time is 5:00.

[0077] Between 5:00 and 7:00, PV power generation starts with sunrise, and in-home consumption begins to increase. The charge / discharge control device 10 supplies power to the load 57 with priority given to the PV surplus, and discharges the shortage from the in-vehicle storage battery 311.

[0078] [Summary of the first embodiment] As described above, the charge / discharge control device 10 according to this embodiment includes the target SOC acquisition unit 110 to acquire a target SOC, the target time acquisition unit 120 to acquire a target time, the calculation unit 130 to calculate a charging start time based on the target SOC and the target time, the current time acquisition unit 140 to acquire the current time, and the control unit 150 to control charging to start when the charging start time arrives and to stop charging when it is determined that the SOC of the in-vehicle storage battery 311 has reached the target SOC. That is, according to this embodiment, the charge / discharge control device 10 controls charging of the in-vehicle storage battery 311 up to the target SOC at the target time. Therefore, according to this embodiment, a user can use the vehicle 31 for mobility purposes and can also store surplus power generated by the solar panel 21. Therefore, according to this embodiment, the charge / discharge control device 10 can achieve both mobility purposes and storage battery purposes for a vehicle equipped with an in-vehicle storage battery.

[0079] Furthermore, according to this embodiment, the charge / discharge control device 10 includes the calculation unit 130, and thereby calculates the charging start time based on the difference between the current SOC of the in-vehicle storage battery 311 and the target SOC and the charging power of the in-vehicle storage battery 311. That is, if the charging power is fast, the time between the target time and the charging start time is short, and if the charging power is slow, the time between the target time and the charging start time is long. Therefore, according to this embodiment, even if the charging power differs depending on the type or deterioration state of the in-vehicle storage battery 311, it is possible to accurately control the in-vehicle storage battery 311 to be charged to the target SOC at the target time.

[0080] Furthermore, according to this embodiment, the charging power is a predetermined constant value in the charge / discharge control device 10. The charge / discharge control device 10 calculates the charging start time based on the charging power, which is a constant value, and therefore can easily calculate the charging start time.

[0081] Furthermore, according to this embodiment, the calculation unit 130 learns the charging power based on the charging time and charge amount required to charge the in-vehicle storage battery 311. Furthermore, the calculation unit 130 calculates the charging start time based on the learned charging power. Therefore, according to this embodiment, even if the charging power changes due to deterioration of the in-vehicle storage battery 311, the calculation unit 130 can accurately control the in-vehicle storage battery 311 to be charged to the target SOC at the target time.

[0082] Furthermore, according to this embodiment, the charge / discharge control device 10 controls charging of the in-vehicle storage battery 311 from a solar cell, which is a DC power source, and discharging from the in-vehicle storage battery 311 to the load 57. Furthermore, the control unit 150 determines the direction of power flow based on sensor output information acquired by the current sensor 55. That is, according to this embodiment, the charge / discharge control device 10 determines the direction of power flow using the current sensor 55, and performs charging or discharging according to the determined direction of power flow. Therefore, according to this embodiment, the charge / discharge control device 10 can easily determine whether the in-vehicle storage battery 311 should be charged or discharged.

[0083] [Second embodiment] Next, a second embodiment will be described with reference to Figures 8 and 9. A charge / discharge control device 10A according to the second embodiment differs from the charge / discharge control device 10 in that it also performs control based on an "upper SOC limit value" and an "lower SOC limit value."

[0084] The "SOC upper limit" is the upper limit of the SOC that can be charged to the in-vehicle storage battery 311. The "SOC upper limit" is 100% in principle, and does not need to be set by the user. The "SOC lower limit" is the lower limit of the SOC that can be discharged from the in-vehicle storage battery 311. The charge / discharge control device 10A discharges within the range up to the set "SOC lower limit." In other words, whenever the user uses the vehicle 31 for mobility purposes, the SOC set by the "SOC lower limit" is ensured. The "SOC upper limit value" or the "SOC lower limit value" may be set independently in the vehicle 31 and the charge / discharge control device 10. The "SOC upper limit value" set in the charge / discharge control device 10 is preferably set to a value lower than the "SOC upper limit value" preset in the vehicle 31. The "SOC lower limit value" set in the charge / discharge control device 10 is preferably set to a value higher than the "SOC lower limit value" preset in the vehicle 31.

[0085] 8 is a diagram showing an example of the functional configuration of a charge / discharge control device according to the second embodiment, with reference to which an example of the functional configuration of a charge / discharge control device 10A will be described. The charge / discharge control device 10A differs from the charge / discharge control device 10 in that it includes an SOC variation range acquisition unit 160. In the description of the charge / discharge control device 10A, the same components as those in the charge / discharge control device 10 are denoted by the same reference numerals, and the description thereof may be omitted.

[0086] The SOC variation range acquisition unit 160 includes an SOC lower limit value acquisition unit 161 and an SOC upper limit value acquisition unit 162 . The SOC lower limit value acquisition unit 161 acquires a lower limit value of the SOC of the in-vehicle storage battery 311 when discharging from the in-vehicle storage battery 311 to a load. Information including the SOC lower limit value is also referred to as SOC lower limit value information ISL. The SOC lower limit value acquisition unit 161 outputs the SOC lower limit value information ISL to the control unit 150. The SOC upper limit value acquisition unit 162 acquires an upper limit value of the SOC of the in-vehicle storage battery 311 when the in-vehicle storage battery 311 is charged from the grid power 62 or the solar panel 21. Information including the SOC upper limit value is also referred to as SOC upper limit value information ISU. The SOC upper limit value acquisition unit 162 outputs the SOC upper limit value information ISU to the control unit 150.

[0087] The control unit 150 controls discharging from the in-vehicle storage battery 311 to the load 57, and when the SOC of the in-vehicle storage battery 311 reaches a lower limit, controls to stop discharging from the in-vehicle storage battery 311 to the load 57. The control unit 150 also controls charging from the grid power 62 or the solar panel 21 to the in-vehicle storage battery 311, and when the SOC of the in-vehicle storage battery 311 reaches an upper limit, controls to stop charging from the grid power 62 or the solar panel 21 to the in-vehicle storage battery 311.

[0088] 9 is a diagram showing an example of a user request acquisition screen according to the second embodiment. An example of a user request acquisition screen D10A will be described with reference to the drawing. D10A differs from the user request acquisition screen D10 in that it includes a text box D13 and a text box D14. In describing the user request acquisition screen D10A, components similar to those in the user request acquisition screen D10 are denoted by similar reference numerals, and description thereof may be omitted. The text box D13 allows the user to enter information in a predetermined manner to obtain the SOC lower limit. The text box D14 allows the user to enter information in a predetermined manner to obtain the SOC upper limit. In the example shown in the figure, the SOC lower limit is 30% and the SOC upper limit is 100%.

[0089] The SOC upper limit value and the SOC lower limit value may be set in step S110 described with reference to Fig. 5. The user sets the "SOC upper limit value" and the "SOC lower limit value" using a predetermined method. Based on the user's settings, the charge / discharge control device 10A acquires information about the "SOC upper limit value" and the "SOC lower limit value."

[0090] In step S150 described with reference to FIG. 5, the charge / discharge control device 10A stops charging when the SOC of the in-vehicle storage battery 311 reaches the "SOC upper limit" acquired in step S110. Furthermore, in step S170 described with reference to FIG. 5, even in the case of PV insufficiency, if the SOC of the vehicle-mounted storage battery 311 reaches the "SOC lower limit value" acquired in step S110, the charge / discharge control device 10A stops discharging from the vehicle-mounted storage battery 311 to the load 57.

[0091] [Summary of the second embodiment] As described above, the charge / discharge control device 10A according to this embodiment includes the SOC lower limit value acquisition unit 161 to acquire the SOC lower limit value of the in-vehicle storage battery 311, and includes the control unit 150 to perform control to stop discharging from the in-vehicle storage battery 311 to the load 57 when the SOC of the in-vehicle storage battery 311 reaches the SOC lower limit value. That is, the charge / discharge control device 10A controls charging and discharging within a range that does not fall below the set "SOC lower limit value." Therefore, according to this embodiment, the user can use the vehicle 31 for mobility purposes with the required SOC ensured, regardless of when the user uses the vehicle 31 for mobility purposes.

[0092] Furthermore, according to this embodiment, the charge / discharge control device 10A includes the SOC upper limit value acquisition unit 162, thereby acquiring the SOC upper limit value of the in-vehicle storage battery 311, and the control unit 150, thereby controlling the charging of the in-vehicle storage battery 311 from the grid power 62 or the solar panel 21 to be stopped when the SOC of the in-vehicle storage battery 311 reaches the SOC upper limit value. That is, the charge / discharge control device 10A controls charging / discharging within a range that does not exceed the set "SOC upper limit value." Therefore, according to this embodiment, the user can prevent unnecessary overcharging of the in-vehicle storage battery 311. Therefore, the charge / discharge control device 10A can save on electricity costs without charging unnecessary power from the grid power 62.

[0093] Furthermore, according to this embodiment, the charge / discharge control device 10A includes the SOC variation range acquisition unit 160, and thereby acquires the range of SOC when controlling charge / discharge. The charge / discharge control device 10A controls charge / discharge so that the SOC range of the in-vehicle storage battery 311 falls within the acquired SOC range. In other words, when the user uses the vehicle 31 for mobility purposes, the charge / discharge control device 10A controls the SOC range of the in-vehicle storage battery 311 so that it falls within the acquired SOC range. Therefore, according to this embodiment, the charge / discharge control device 10A can be used for both mobility of the vehicle 31 equipped with the in-vehicle storage battery 311 and storage battery purposes.

[0094] [Third embodiment] Next, a third embodiment will be described with reference to Fig. 10. A charge / discharge control device 10B according to the third embodiment has a function of determining whether or not the in-vehicle storage battery 311 has deteriorated, and differs from the charge / discharge control device 10 in that, if it is determined that the in-vehicle storage battery 311 has deteriorated, the charge / discharge control device 10B notifies the user that the in-vehicle storage battery 311 has deteriorated.

[0095] Here, the deterioration level of the storage battery can be determined based on the charging power. Therefore, in the third embodiment, a predetermined charging power is determined in advance, and the deterioration level of the storage battery is determined based on the result of comparing the predetermined charging power with the calculated charging power of the in-vehicle storage battery 311.

[0096] 10 is a diagram showing an example of the functional configuration of a charge / discharge control device according to the third embodiment, an example of the functional configuration of a charge / discharge control device 10B will be described with reference to the same figure. The charge / discharge control device 10B differs from the charge / discharge control device 10 in that it includes a notification unit 170. In the description of the charge / discharge control device 10B, the same components as those in the charge / discharge control device 10 are denoted by the same reference numerals and the description thereof may be omitted.

[0097] The charge / discharge control device 10B uses a rated charging power acquisition unit (not shown) to acquire information about the rated charging power of the in-vehicle storage battery 311. The rated charging power acquisition unit may acquire pre-stored rated charging power from a storage unit (not shown). The notification unit 170 notifies whether the charging power calculated by the calculation unit 130 is equal to or less than a predetermined rated charging power. For example, the notification unit 170 may determine that the in-vehicle storage battery 311 is degraded when the charging power calculated by the calculation unit 130 is equal to or less than a predetermined rated charging power. When the notification unit 170 determines that the in-vehicle storage battery 311 is degraded, the notification unit 170 notifies that the in-vehicle storage battery 311 is degraded.

[0098] The notification unit 170 may, for example, have a wireless communication device (not shown), and may notify the mobile terminal device 71 via the router 56 and a predetermined communication network NW that the vehicle storage battery 311 is degraded by using the wireless communication device. As a variant, the notification unit 170 may notify the driver that the in-vehicle storage battery 311 is deteriorating by lighting or blinking a light emitting diode (LED) (not shown), displaying a message on a display unit (not shown) such as a liquid crystal display, or the like.

[0099] [Summary of the third embodiment] As described above, the charge / discharge control device 10B according to this embodiment includes the notification unit 170, and notifies the user that the in-vehicle storage battery 311 is degraded when the charging power calculated by the calculation unit 130 is equal to or less than a predetermined rated charging power. Therefore, according to this embodiment, the user can recognize that the in-vehicle storage battery 311 is degraded.

[0100] [Fourth embodiment] Next, a fourth embodiment will be described with reference to Fig. 11 and Fig. 12. A charge / discharge control device 10C according to the fourth embodiment differs from the charge / discharge control device 10 in that it also performs control based on a "charge priority time zone". The "priority charging time period" is a time period during which charging of the in-vehicle storage battery 311 is prioritized.

[0101] 11 is a diagram showing an example of the functional configuration of a charge / discharge control device according to the fourth embodiment, with reference to which an example of the functional configuration of a charge / discharge control device 10C will be described. The charge / discharge control device 10C differs from the charge / discharge control device 10 in that it includes a charge priority time zone acquisition unit 180. In the description of the charge / discharge control device 10C, the same components as those in the charge / discharge control device 10 are denoted by the same reference numerals, and the description thereof may be omitted.

[0102] The priority charging time slot acquisition unit 180 acquires the priority charging time slot. Information including the priority charging time slot is also referred to as priority charging time slot information IPT. The priority charging time slot acquisition unit 180 outputs the priority charging time slot information IPT to the control unit 150. The control unit 150 controls the in-vehicle storage battery 311 to start charging during the acquired charge priority time slot, regardless of the charging start time.

[0103] If the current time is not within the charge priority time zone, the charge start time has not yet been reached, and the direction of the current indicated in the sensor output information acquired by the current sensor 55 is the direction of discharging from the solar panel 21 to the grid power 62, the control unit 150 prioritizes charging from the solar panel 21 to the vehicle storage battery 311. In addition, the control unit 150 prioritizes discharging the on-board storage battery 311 if the current time is not within the charge priority time zone, the charge start time has not yet been reached, and the direction of the current indicated in the sensor output information acquired by the current sensor 55 is not discharging from the solar panel 21 to the grid power 62 (i.e., if power is being purchased from the grid power 62).

[0104] 12 is a diagram showing an example of a user request acquisition screen according to the fourth embodiment. An example of a user request acquisition screen D10C will be described with reference to the same figure. D10C differs from the user request acquisition screen D10 in that it includes a text box D5. In the description of the user request acquisition screen D10C, components similar to those of the user request acquisition screen D10 are denoted by similar reference numerals, and description thereof may be omitted. In the text box D15, the user inputs information in a predetermined manner to obtain the priority charging time period. In the example shown in the figure, the priority charging time period is from 24:00 to 6:00.

[0105] The priority charging time period may be set in step S110 described with reference to Fig. 5. The user sets the "priority charging time period" using a predetermined method. Based on the user's setting, the charge / discharge control device 10C acquires information about the "priority charging time period."

[0106] [Summary of the Fourth Embodiment] As described above, the charge / discharge control device 10C according to this embodiment includes the priority charging time slot acquisition unit 180 to acquire the priority charging time slot, and the control unit 150 to During the acquired priority charging time slot, charging is controlled to start regardless of the charging start time. Note that the priority charging time slot is assumed to be set during the night or late night hours. Therefore, according to this embodiment, the user can set a charge priority time period, so that the charge / discharge control device 10C can charge the in-vehicle storage battery 311 preferentially during the night when electricity rates are low.

[0107] Furthermore, according to this embodiment, the charge / discharge control device 10C is provided with the control unit 150, and therefore prioritizes charging from the solar panel 21 to the vehicle storage battery 311 when it is not a charge priority time zone, the charge start time has not been reached, and the direction of the current indicated in the sensor output information acquired by the current sensor 55 is the direction of discharging from the solar panel 21. Furthermore, according to this embodiment, the charge / discharge control device 10C is provided with the control unit 150, and therefore prioritizes discharging the on-board storage battery 311 when it is not a charge priority time zone, the charge start time has not been reached, and the direction of the current indicated in the sensor output information acquired by the current sensor 55 is not the direction of discharging from the solar panel 21. Note that the time period that is not a charge priority time period is assumed to be a daytime time period. Therefore, according to this embodiment, when the charge priority time period is set to a nighttime or late-night time period, the charge / discharge control device 10C can suitably control charge / discharge even during the daytime.

[0108] Note that all or part of the functions of each unit of the charge / discharge control device 10 in the above-described embodiment may be realized by recording a program for realizing these functions on a computer-readable recording medium, and reading and executing the program recorded on the recording medium into a computer system. Note that the term "computer system" here includes hardware such as an OS and peripheral devices.

[0109] Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage units such as hard disks built into computer systems. Furthermore, "computer-readable recording media" may also include devices that dynamically store programs for a short period of time, such as communication lines when transmitting programs over networks like the Internet or communication lines like telephone lines, or devices that store programs for a fixed period of time, such as volatile memory within computer systems that serve as servers or clients in such cases. Furthermore, the above-mentioned programs may be programs that realize some of the aforementioned functions, or may be programs that can realize the aforementioned functions in combination with programs already stored in the computer system.

[0110] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the invention. [Explanation of symbols]

[0111] 1...Charge / discharge system, 10...Charge / discharge control device, 11...Power supply changeover switch, 20...House, 21...Solar panel, 23...PV power conditioner, 22...Connection box, 31...Vehicle, 311...In-vehicle storage battery, 32...DC link V2H, 33...AC link type V2H, 41...Storage battery, 51...Grid connection breaker, 52...Switching box, 53...Audio monitor, 54...Distribution board, 55...Current sensor, 56...Router, 57...Load, 571...100V load, 572...20 0V load, 61... smart meter, 62... grid power, 63... main breaker, 71... mobile terminal device, NW... communication network, 110... target SOC acquisition unit, 120... target time acquisition unit, 130... calculation unit, 140... current time acquisition unit, 150... control unit, 160... SOC variation range acquisition unit, 161... SOC lower limit value acquisition unit, 162... SOC upper limit value acquisition unit, 170... notification unit, 180... charging priority time zone acquisition unit, D10... user request acquisition screen

Claims

1. A charge / discharge control device that controls charging of an on-board storage battery from a DC power supply and discharging of the on-board storage battery to a load, a target SOC acquisition unit that acquires a target SOC indicating an SOC of the in-vehicle storage battery at a target time; a target time acquisition unit that acquires the target time; a calculation unit that calculates a charge start time, which is a time to start charging the on-board storage battery, based on the target SOC and the target time, at predetermined regular time intervals so that charging is completed by the target time; a current time acquisition unit that acquires the current time; a control unit that compares the acquired current time with the calculated charging start time, and controls to start charging when the charging start time arrives, and controls to stop charging when it is determined that the SOC of the in-vehicle storage battery has reached the target SOC; A charge / discharge control device comprising:

2. an SOC lower limit value acquisition unit that acquires a lower limit value of an SOC of the vehicle storage battery when discharging from the vehicle storage battery to a load; The control unit controls discharge from the vehicle-mounted storage battery to the load, and when the SOC of the vehicle-mounted storage battery reaches the lower limit value, controls to stop discharge from the vehicle-mounted storage battery to the load. The charge / discharge control device according to claim 1 .

3. The calculation unit calculates the charging start time based on a difference between a current SOC of the vehicle-mounted storage battery and the target SOC, and charging power that is a rate at which the vehicle-mounted storage battery is charged. The charge / discharge control device according to claim 1 or 2.

4. the charging power is a constant value, The calculation unit calculates the charging start time based on the predetermined charging power. The charge / discharge control device according to claim 3 .

5. The calculation unit learns the charging power based on a charging time and a charging amount required to charge the in-vehicle storage battery, and calculates the charging start time based on the learned charging power. The charge / discharge control device according to claim 3 .

6. a notification unit that notifies whether the charging power calculated by the calculation unit is equal to or less than a predetermined rated charging power; The charge / discharge control device according to claim 5 .

7. further comprising a charging priority time slot acquisition unit that acquires a charging priority time slot; The control unit controls the vehicle to start charging during the acquired priority charging time period regardless of the charging start time. The charge / discharge control device according to any one of claims 1 to 6.

8. the DC power source is a solar cell that converts light energy into DC power; The control unit determines the direction of power flow based on sensor output information acquired by a current sensor that acquires information about power supplied from a grid power source to a load or power supplied from the DC power source to the grid power source. The charge / discharge control device according to any one of claims 1 to 7.

9. The control unit prioritizes charging from the solar cell to the vehicle storage battery when the time is not the charge priority time slot, the charge start time has not been reached, and the direction of the power flow indicated in the sensor output information is a reverse power flow to the grid power, and prioritizes discharging of the vehicle storage battery when the time is not the charge priority time slot, the charge start time has not been reached, and the direction of the power flow indicated in the sensor output information is a forward power flow from the grid power. The charge / discharge control device according to claim 8 dependent on claim 7.

10. a computer that controls charging from a DC power supply to an on-board storage battery and discharging from the on-board storage battery to a load; a target SOC acquisition step of acquiring a target SOC indicating an SOC of the in-vehicle storage battery at a target time; a target time acquisition step of acquiring the target time; a calculation step of calculating a charging start time, which is a time to start charging the on-board storage battery, at predetermined regular time intervals based on the target SOC and the target time so that charging is completed by the target time; a current time acquisition step for acquiring the current time; a control step of comparing the acquired current time with the calculated charging start time, and controlling to start charging when the charging start time has arrived, and controlling to stop charging when it is determined that the SOC of the in-vehicle storage battery has reached the target SOC; A program that executes the following.

11. A charge / discharge control method for controlling charging of an on-board storage battery from a DC power supply and discharging of the on-board storage battery to a load, comprising: a target SOC acquisition step of acquiring a target SOC indicating an SOC of the on-board storage battery at a target time; a target time acquisition step of acquiring the target time; a calculation step of calculating a charging start time, which is a time to start charging the on-board storage battery, at predetermined regular time intervals based on the target SOC and the target time so that charging is completed by the target time; a current time acquisition step of acquiring the current time; a control step of comparing the acquired current time with the calculated charging start time, and controlling to start charging when the charging start time has arrived, and controlling to stop charging when it is determined that the SOC of the vehicle storage battery has reached the target SOC; A charge / discharge control method comprising:

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