JP2012085383A - Charge/discharge system, charge/discharge apparatus and electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge/discharge system that enables a user to intuitively know necessary information on charge/discharge of an on-vehicle battery at different sites and can contribute to apparatus miniaturization and cost reduction.SOLUTION: The charge/discharge system includes an indoor display 23a installed indoors to display a plurality of items indicating a charge/discharge state of the battery, and a charge/discharge gun display 22a and an exterior display 13 disposed at a connection of a charge/discharge apparatus to a vehicle or an exterior portion of the vehicle to display part of the display items of the indoor display 23a. The display items on the charge/discharge gun display 22a and the exterior display 13 include an indication of whether or not smart grid control is active, and a power transmission direction between the charge/discharge apparatus and the battery.

Description

  The present invention relates to a charging / discharging system for a battery of a vehicle, and more particularly to a display function indicating a charging / discharging state of a battery.

  Next called “smart grid”, which incorporates automatic power supply / demand control, which includes not only power supply from the power plant to the power grid from the power plant to the home but also natural energy at home. The development of generational power grids has attracted attention in recent years. In the smart grid, power supply and demand and supply can be optimized by controlling the flow of power in the power network not only from the supply side but also from the demand side.

  For example, there is a possibility that a battery of an automobile owned by each household can be used as a buffer for reducing the peak of power demand (for example, Patent Documents 1 and 2 below). That is, the peak of the power demand is reduced by supplying the electric power of the vehicle battery charged in the time zone when the power demand is low to the house at the peak of the power demand. In general, power during times of low power demand is low in cost, leading to savings in electricity charges at each home. In addition, if the power of the vehicle battery can be used at home, there is an advantage that it can cope with an emergency such as a power failure. The smart grid automatically controls such a power flow.

  For example, in the electric power management system disclosed in Patent Document 1, the electric power demand in a house is predicted in consideration of not only electric power demand data in the house but also external factor data such as day of the week, date and time, weather, and the like. Based on the result, power transfer (charging / discharging of the vehicle battery) between the vehicle and the house is automatically scheduled.

  In addition, in the power management system disclosed in Patent Document 2, the battery state of the vehicle (voltage / input / output current and the remaining amount of power) and the secured power amount defined based on the travel history (the power amount necessary for daily use by the user) ) And surplus power (battery remaining amount excluding reserved power and emergency power) and time zone are taken into consideration to determine whether to charge the battery or supply power from the battery to the house. Made.

  As shown in FIG. 2 and FIG. 3 of Patent Document 2, this system is a display unit in which various types of information related to charging / discharging of the battery as described above are displayed on a user interface of a charging / discharging device installed in a house. have.

  Moreover, although it is a system which charges a vehicle exclusively, in patent document 3, in order to eliminate the problem of the conventional system in which the charger was arrange | positioned outdoors, such as a garage, the controller which has a display part indoors. A deployed system has been proposed. Further, Patent Document 4 proposes a form in which an indicator is arranged on the outer surface of the vehicle body in order to solve the problem of a conventional electric vehicle in which the state of charge of the battery is confirmed by an indicator provided on an instrument panel in the vehicle interior. Has been.

JP 2008-54439 A JP 2001-8380 A JP 9-233720 A Japanese Patent Laid-Open No. 9-285022

  As described above, in the power grid managed by the smart grid, not only charging the battery of the vehicle (power supply from the house to the vehicle) but also actively discharging the battery (power supply from the vehicle to the house). Is assumed. In addition, since the charging / discharging of the battery is automatically managed by schedule, even if the vehicle and the charger are connected, charging may not be started unless the scheduled charging time is reached. Therefore, even though the user connected the vehicle to the charger in an attempt to charge the battery immediately, it is not actually charged or on the contrary, between the user's thought and the actual operation Differences can occur.

  In a system such as Patent Document 2 having a display unit in which information related to charging / discharging of the battery is displayed in detail, the above difference can be avoided by checking the display unit. Furthermore, if such a display unit is arranged not only indoors but also in a plurality of places such as outdoors, the interior of a vehicle, and the outer surface of a vehicle body as suggested in Patent Documents 3 and 4, the user can charge the battery in each place. The discharge state can be confirmed.

  However, a display unit that displays a large amount of information related to charging / discharging of the battery may display more information than necessary, and it is difficult for the user to intuitively grasp the necessary information. In addition, since the display unit for displaying such a large amount of information has a complicated structure, if it is installed in a plurality of places, there is a possibility that the size and cost of the individual will increase more than necessary in each device.

  The present invention has been made to solve the above-described problems, and allows the user to intuitively grasp necessary information regarding charging / discharging of the battery at each location, and contributes to downsizing and cost reduction of the device. An object of the present invention is to provide a charge / discharge system, a charge / discharge device, and an electric vehicle.

  A charging / discharging system according to the present invention includes a vehicle equipped with a battery, a charging / discharging device that is connected to the vehicle from the outside and charges / discharges the battery, and is disposed indoors to indicate a charging / discharging state of the battery. A second display that displays a part of the display items of the first display, which is arranged at a connection portion of the first display device on which a plurality of items are displayed and the vehicle of the charge / discharge device or an exterior portion of the vehicle. The display item of the second display includes whether or not it is under the control of the smart grid and the direction of power transmission between the charge / discharge device and the battery.

  Since the charging / discharging system according to the present invention has a first indicator disposed indoors and a second indicator that can be seen from around the vehicle, the user can obtain information on charging / discharging the battery at each location. This can be confirmed, and the occurrence of a difference from the user's intention of the charge / discharge control device particularly when under the control of the smart grid can be suppressed. Furthermore, since only a part of the information on the first display is displayed on the second display, the user can intuitively obtain necessary information from the second display. In addition, the second display can have a simpler configuration than the first display, which can contribute to downsizing and cost reduction.

It is a block diagram of the charging / discharging system which concerns on embodiment. It is a figure which shows an example of the indoor indicator of the charging / discharging system which concerns on embodiment. It is a figure which shows an example of the charging / discharging gun display of the charging / discharging system which concerns on embodiment. It is a figure for demonstrating operation | movement of the power transmission direction display part of a charge / discharge gun indicator. It is a figure which shows an example of the instrument panel display of the charging / discharging system which concerns on embodiment. It is a figure which shows an example of the indicator outside a vehicle of the charging / discharging system which concerns on embodiment.

  FIG. 1 is a diagram showing a configuration of an in-vehicle battery charge / discharge system according to an embodiment of the present invention. The charge / discharge system includes an electric vehicle 10 (electric vehicle) on which a battery 11 (secondary battery) is mounted, and a charge / discharge control device 21 that charges and discharges the battery 11 of the electric vehicle 10. The charge / discharge control device 21 is installed in a house 20 to which power is supplied from a commercial power source 24.

  The electric vehicle 10 includes a display 12 (hereinafter, “instrument display”) disposed on an instrument panel (hereinafter, “instrument display”) controlled by a vehicle-mounted controller, and a display unit 13 ( The vehicle outside indicator 13) and the charging / discharging port 14 for charging / discharging the battery 11 from the outside are provided.

  The charge / discharge control device 21 includes a charge / discharge gun 22 that is a connection portion to the charge / discharge port 14 of the electric vehicle 10 and an indoor controller 23 that can operate the charge / discharge control device 21 in the house 20. In the harness between the main body of the charge / discharge control device 21 and the charge / discharge gun 22, not only a power line for exchanging power but also a communication line such as a CAN (Controller Area Network) is incorporated. Information on charging / discharging of the battery 11 can be exchanged between the charging / discharging control device 21 and the in-vehicle controller 15 via the charging gun and its harness. The charge / discharge gun 22 is provided with a display 22a (hereinafter “charge / discharge gun display”), and the indoor controller 23 is provided with a display 23a (hereinafter “indoor display”).

  As described above, in the system according to the present embodiment, the display devices are provided at four locations. The display contents of each display device will be described later.

  The charge / discharge control device 21 is an automatic supply / demand control device for electric power that forms part of the smart grid, but can also operate as a simple charger according to user settings. Hereinafter, an operation mode in which the charge / discharge control device 21 is under the control of the smart grid and functions as an automatic control device is referred to as a “smart grid control mode”, and the charge / discharge control device 21 is under the charge control. The operation mode that operates as is referred to as a “charge-only mode”.

  In the smart grid control mode, the charge / discharge control device 21 is based on various information such as a history of power demand in the house 20, the state of the battery 11 of the electric vehicle 10 connected to the charge / discharge gun 22, and the current time. 11 is charged and discharged, and the battery 11 is charged and discharged according to the schedule. The information considered by the charge / discharge control device 21 for charge / discharge scheduling may include external factors such as day of the week, date, and weather in addition to the information described above.

  When discharging the battery 11 in the smart grid control mode, the remaining amount of electric power stored in the battery 11 (hereinafter simply referred to as “remaining amount”) is determined in consideration of the travel history of the electric vehicle 10. In order not to fall below the amount of power (the amount of power necessary for daily driving by the user) or the amount of emergency power (the amount of power that should be secured at the minimum in preparation for an emergency; for example, 20% of the previous capacity) A certain lower limit is set for the remaining amount of the battery 11.

  In addition, when charging the battery 11 in the smart grid control mode, the remaining state of the battery 11 after charging is prevented so that overcharging does not occur in consideration of the state of the battery 11 (voltage, input / output current and remaining amount). There is a certain upper limit on the amount. However, this upper limit may be 100% of the capacity of the battery, or may be set to a low value of 80% in consideration of the battery life.

  On the other hand, in the charge-only mode, the charge / discharge control device 21 needs to insert the charge / discharge gun 22 into the charge / discharge port 14 of the electric vehicle 10 and start charging manually by the user. In the charge-only mode, charging of the battery 11 is started immediately according to the user's manual operation regardless of the date or time zone.

  Hereinafter, the display contents of each of the four displays included in the present system will be described.

  FIG. 2 is a diagram illustrating an example of the display content of the indoor display 23 a disposed in the house 20. As shown in the figure, the indoor indicator 23a includes a remaining amount display unit 31, a lower limit display unit 32, an upper limit display unit 33, a remaining amount indicator 34, a lower limit indicator 35, an upper limit indicator 36, a control mode display unit 37, and a power transmission direction display unit. 38.

  In the remaining amount display unit 31, the remaining amount of the battery 11 at the current time of the electric vehicle 10 connected to the charge / discharge control device 21 is displayed as a number. The lower limit display unit 32 displays the lower limit of the remaining amount when the battery 11 is discharged in the smart grid control mode as a number. The upper limit display unit 33 displays the upper limit of the remaining amount when charging the battery 11 in the smart grid control mode as a number. The remaining amount indicator 34 displays the value of the remaining amount display unit 31 in a bar graph. Further, the lower limit indicator 35 and the upper limit indicator 36 indicate the values of the lower limit display unit 32 and the upper limit display unit 33 by a triangular arrow or the like in the bar graph of the remaining amount indicator 34, respectively.

  The control mode display unit 37 displays whether the charge / discharge control device 21 is in the smart grid control mode, that is, whether it is in the smart grid control mode or the charge-only mode. In the example of FIG. 2, the control mode display unit 37 includes a smart grid mode lamp 37a that is turned on in the smart grid control mode and a charge-only mode lamp 37b that is turned on in the charge-only mode.

  The power transmission direction display unit 38 indicates the direction of power transmission between the electric vehicle 10 and the charge / discharge control device 21. That is, the power transmission direction display unit 38 indicates whether the charge / discharge control device 21 is charging the battery 11 or discharging the battery 11. The power transmission direction display unit 38 in FIG. 2 includes a charge lamp 38a that is turned on when the charge / discharge control device 21 charges the battery 11, and a discharge lamp 38b that is turned on when the battery 11 is discharged. When the charge / discharge control device 21 is not charging or discharging the battery 11, neither the charge lamp 38a nor the discharge lamp 38b is lit.

  In the smart grid control mode, the charging / discharging control device 21 sets a schedule for charging and discharging the battery 11, and charging / discharging of the battery 11 is performed according to the schedule. Therefore, for example, even if the user connects the electric vehicle 10 to the charge / discharge control device 21 in an attempt to charge the battery 11 immediately, charging is not always started immediately. Therefore, contrary to the user's intention, there may arise a problem that the battery 11 is not charged or discharged, and an operation different from the user's intention is performed.

  The indoor indicator 23a of the present embodiment includes a control mode display unit 37 that displays an operation mode of the charge / discharge control device 21, and a power transmission direction display unit 38 that indicates whether the battery 11 is charged or discharged. Therefore, since the user can confirm the state of charging / discharging of the battery 11 by confirming the display, the above problem can be solved.

  For example, when the charge / discharge control device 21 is operating in the smart grid control mode (while the smart grid mode lamp 37a is lit), if the user tries to charge the battery 11 and the charge lamp 38a is not lit, the smart grid It is considered that this is not the period allocated for charging. In this case, the user can reliably charge the battery 11 by switching the charge / discharge control device 21 to the charge-only mode. Further, whether or not the charging operation is performed can be confirmed by the power transmission direction display unit 38.

  FIG. 3 is a diagram illustrating an example of display contents of the charge / discharge gun indicator 22 a provided in the charge / discharge gun 22 (connection portion) of the charge / discharge control device 21. As shown in FIG. 3, the charge / discharge gun 22 has a connection plug 41 connected to the charge / discharge port 14 of the electric vehicle 10, and the charge / discharge gun indicator 22 a has the connection plug 41 inserted into the charge / discharge port 14. In this state, it is disposed on the handle part or the upper part of the charge / discharge gun so that the user can visually recognize it.

  The charge / discharge gun indicator 22a displays a part of the display items of the indoor indicator 23a described above, and includes a control mode indicator 42 and a power transmission direction indicator 43 in the example of FIG.

  The control mode display unit 42 of the charge / discharge gun display 22a corresponds to the control mode display unit 37 of the indoor display 23a, and displays whether the charge / discharge control device 21 is in the smart grid control mode or the charge-only mode. . 3 is a lamp that emits light in different colors when the charge / discharge control device 21 operates in the smart grid control mode and when it operates in the charge-only mode.

  The power transmission direction display unit 43 of the charge / discharge gun display 22a corresponds to the power transmission direction display unit 38 of the indoor display 23a, and indicates the direction of power transmission between the electric vehicle 10 and the charge / discharge control device 21. The power transmission direction display unit 43 in FIG. 3 is configured by a light emitting diode (LED) row, and the light emission order of each LED constituting the LED row changes as shown in FIG. 4 according to the power transmission direction. That is, each LED repeatedly emits light in the order of approaching the connection plug 41 during charging, and each LED repeatedly emits light in the order of moving away from the connection plug 41 during discharge.

  Thus, the charging / discharging gun 22 includes the charging / discharging gun indicator 22a including the control mode display unit 42 and the power transmission direction display unit 43 at a position where the charging / discharging gun 22 is visible in a state connected to the charging / discharging port 14. The user can confirm the state of charge / discharge of the battery 11 by confirming the display. Therefore, it is possible to solve the problem of difference from the above-mentioned user's intention.

  In particular, in the charge / discharge gun display 22a of the present embodiment, among the display items of the indoor display 23a, the control mode display unit 42 indicating the operation mode of the charge / discharge control device 21, the charge / discharge control device 21 and the electric vehicle. Only the power transmission direction display unit 43 indicating the power transmission direction between the first and second terminals 10 is provided.

  Since the indoor controller 23 is for performing various operations of the charge / discharge control device 21, it is desirable that more information is displayed on the indoor display 23a. However, since the charging / discharging gun 22 is merely a relatively simple operation (for example, charging / discharging schedule input is performed indoors only by starting / stopping charging / discharging, etc.), the charging / discharging gun indicator 22a is the minimum necessary. A simple one that only displays limited information is sufficient. Rather, there is an advantage that the user can intuitively grasp the state of charge / discharge of the battery 11 at a glance by reducing the display items of the charge / discharge gun indicator 22a to the minimum necessary. Furthermore, the number of parts required for the charge / discharge gun display 22a can be reduced, which can contribute to downsizing and cost reduction of the apparatus.

  FIG. 5 is a diagram illustrating an example of display contents of the instrument panel display 12 disposed in the electric vehicle 10. The instrument panel display 12 is disposed in front of the driver's seat so that the user (driver) can see it while sitting in the driver's seat, and is generally provided with a speedometer 51 and the like. In this Embodiment, it functions also to display a part of display item of said indoor indicator 23a.

  The instrument panel display 12 of FIG. 5 includes a remaining amount indicator 52, a lower limit indicator 53, a control mode display unit 54, and a power transmission direction display unit 55 in addition to the speedometer 51.

  The remaining amount indicator 52 of the instrument panel display 12 corresponds to the remaining amount indicator 34 of the charge / discharge control device 21 and displays the remaining amount of the battery 11 in a bar graph. The lower limit indicator 53 corresponds to the lower limit indicator 35 of the charge / discharge control device 21, and the lower limit of the remaining amount when the charge / discharge control device 21 in the smart grid control mode discharges the battery 11 is indicated in the bar graph of the remaining amount indicator 52. This is indicated by a triangular arrow. Although not provided in the example of FIG. 5, the instrument panel display 12 may further be provided with an upper limit indicator (corresponding to the upper limit indicator 36 of the charge / discharge control device 21).

  The control mode display unit 54 of the instrument panel display 12 corresponds to the control mode display unit 37 of the indoor display 23a, and indicates whether the charge / discharge control device 21 connected to the outside is in the smart grid control mode or the charge-only mode. indicate. The control mode display unit 54 in FIG. 5 is a lamp that emits light in different colors when the charge / discharge control device 21 operates in the smart grid control mode and when it operates in the charge-only mode. Alternatively, the control mode display unit 54 may be a lamp that is lit only in the smart grid control mode.

  The power transmission direction display section 55 of the instrument panel display 12 corresponds to the power transmission direction display section 38 of the indoor display 23 a and indicates the direction of power transmission between the electric vehicle 10 and the charge / discharge control device 21. The power transmission direction display unit 55 in FIG. 5 includes an arrow-shaped charging lamp 55a that is turned on when the charge / discharge control device 21 charges the battery 11, and an arrow-shaped discharge lamp 55b that is turned on when the battery 11 is discharged. Yes.

  Thus, the instrument panel display 12 is provided with the control mode display unit 54 and the power transmission direction display unit 55 at a position where the user of the driver's seat can visually recognize, so that the user can confirm the display and charge / discharge the battery 11. You can check the status. Therefore, it is possible to solve the problem of performing an operation different from the user's intention.

  Further, as described above, the remaining amount indicator 52 and the lower limit indicator 53 are provided on the instrument panel display 12, so that the user can check whether or not the battery 11 needs to be charged when driving the electric vehicle 10 or immediately after the end of the driving. Judgment can be made.

  As described above, since the display items on the instrument panel display 12 are reduced to the minimum necessary, there is an advantage that the user can intuitively grasp the charge / discharge state of the battery 11 at a glance. Furthermore, the number of parts required for the instrument panel display 12 can be reduced, and the apparatus can be reduced in size and cost.

  FIG. 6 is a diagram illustrating an example of the display contents of the external display 13 disposed in the external portion of the electric vehicle 10. The “appearance part” of the electric vehicle 10 referred to in this specification refers to not only the surface of the vehicle body but also the charge / discharge gun 22 connected to the charge / discharge port 14, for example, at the window in the vehicle or inside the lid of the charge / discharge port 14. In this state, it includes a portion that is visible from outside the vehicle. FIG. 6 shows an example in which the vehicle outside indicator 13 is disposed together with the brake lamp 62 in the vehicle visible through the rear window 61.

  The outside display 13 displays a part of the display items of the indoor display 23a or a part of the display items of the instrument panel display 12. 6 includes a control mode display unit 131 and a power transmission direction display unit 132.

  The control mode display part 131 of the vehicle outside indicator 13 corresponds to the control mode display part 37 of the indoor indicator 23a, and indicates whether the charge / discharge control device 21 connected to the outside is in the smart grid control mode or the charge-only mode. indicate. 6 is a lamp that emits light in different colors when the charge / discharge control device 21 is in the smart grid control mode and when in the charge-only mode.

  Moreover, the power transmission direction display part 132 of the vehicle exterior indicator 13 is corresponded to the power transmission direction display part 38 of the indoor indicator 23a, and shows the direction of the power transmission between the electric vehicle 10 and the charging / discharging control apparatus 21. 6 includes a charge lamp 132a that is turned on when the charge / discharge control device 21 charges the battery 11, and a discharge lamp 132b that is turned on when the battery 11 is discharged.

  As described above, the vehicle exterior indicator 13 including the control mode display unit 131 and the power transmission direction display unit 132 is arranged on the external portion of the electric vehicle 10, so that the user can confirm the display and charge / discharge the battery 11. You can check the status. Thereby, the problem of performing an operation different from the user's intention of the charge / discharge control device 21 is solved.

  Among the display items of the indoor indicator 23a and the instrument panel indicator 12, the control mode indicator 131 indicating the operation mode of the charge / discharge controller 21 and the charge / discharge controller 21 Only a power transmission direction display section 132 that indicates the direction of power transmission to and from the electric vehicle 10 is provided. By narrowing the display items of the indoor display 23a to the necessary minimum, the user can intuitively grasp the charge / discharge state of the battery 11 at a glance. Furthermore, the number of parts required for the external display 13 can be reduced, which can contribute to downsizing and cost reduction of the apparatus.

  Moreover, in the vehicle outside indicator 13 of this Embodiment, the operation mode of the charging / discharging control apparatus 21 is represented by the color of the control mode display part 131, and the power transmission direction between the charging / discharging control apparatus 21 and the electric vehicle 10 is charged. Although an example in which the lamp 132a or the discharge lamp 132b is turned on has been described, the expression method may be arbitrary, for example, by indicating the blinking speed. In particular, since the vehicle outside indicator 13 is a component of the design of the appearance of the electric vehicle 10, the beauty given to the consumer is also important.

  In the present embodiment, the charge / discharge system is shown in an example in which the charge / discharge gun indicator 22a and the outside indicator 13 are disposed in a portion that is visible from the periphery of the electric vehicle 10, Since they are arranged close to each other and the contents to be displayed overlap, one of them may be omitted.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 11 Battery, 12 Instrument panel display, 13 Outside display, 14 Charging / discharging port, 15 Car-mounted controller, 20 House, 21 Charging / discharging control apparatus, 22 Charging / discharging gun, 22a Charging / discharging gun display, 23 Indoor controller 23a Indoor indicator, 24 Commercial power supply, 31 Remaining capacity indicator, 32 Lower limit indicator, 33 Upper limit indicator, 34, 52 Remaining capacity indicator, 35, 53 Lower limit indicator, 36 Upper limit indicator, 37, 42, 54, 131 Control mode display section, 37a Smart grid mode lamp, 37b Charge-only mode lamp, 38, 43, 55, 132 Transmission direction display section, 38a, 55a, 132a Charge lamp, 38b, 55b, 132b Discharge lamp, 41 Connection plug, 51 Speedometer, 61 rear window, 2 brake lamp.

Claims (10)

A vehicle with a battery,
A charging / discharging device which is connected to the vehicle from the outside and charges / discharges the battery;
A first indicator disposed indoors and displaying a plurality of items indicating the charge / discharge state of the battery;
A second indicator that displays a part of display items of the first indicator, disposed in a connection portion of the charge / discharge device with the vehicle or an exterior portion of the vehicle;
The display items of the second display are:
Whether it is under the control of the smart grid and
The charging / discharging system characterized by including the power transmission direction between the said charging / discharging apparatus and the said battery. The display items of the second display are:
The charging / discharging system according to claim 1, wherein only the effect of whether or not the smart grid is under control and the direction of power transmission between the charging / discharging device and the battery are included. A third indicator that is disposed inside the vehicle and displays a part of the display items of the first indicator;
The display items of the third display are:
Whether to be under the control of the smart grid and the direction of power transmission between the charging / discharging device and the battery,
The remaining amount of the battery;
The charging / discharging system of Claim 1 or 2 including the minimum of the residual amount after the discharge of the said battery. The display items of the first display are:
Whether to be under the control of the smart grid and the direction of power transmission between the charging / discharging device and the battery,
The remaining amount of the battery;
An upper limit of the remaining charge after charging the battery;
The charge / discharge system according to claim 1, further comprising a lower limit of the remaining amount of the battery after discharging. A charging / discharging device that is connected to a vehicle from the outside and charges and discharges the battery of the vehicle,
A first indicator disposed indoors and displaying a plurality of items indicating the charge / discharge state of the battery;
A second display that is disposed in a connection portion with the vehicle and displays a part of display items of the first display;
The display items of the second display are:
Whether it is under the control of the smart grid and
The charging / discharging apparatus characterized by including the charging / discharging apparatus and the power transmission direction between the said batteries. The display items of the second display are:
The charging / discharging device according to claim 5, which is only a message indicating whether or not the smart grid is under control and a power transmission direction between the charging / discharging device and the battery. The display items of the first display are:
Whether to be under the control of the smart grid and the direction of power transmission between the charging / discharging device and the battery,
The remaining amount of the battery;
An upper limit of the remaining charge after charging the battery;
The charging / discharging apparatus of Claim 5 or 6 including the minimum of the residual amount after the discharge of the said battery. An electric vehicle equipped with a battery,
A first indicator that is disposed in the interior of the vehicle and displays a plurality of items indicating the state of charging and discharging of the battery by an external charging and discharging device;
A second indicator that is disposed in the exterior portion of the vehicle and displays a part of display items of the first indicator;
The display items of the second display are:
Whether it is under the control of the smart grid and
An electric vehicle comprising: the charge / discharge device and a power transmission direction between the batteries. The display items of the second display are:
The electric vehicle according to claim 8, wherein only an indication whether or not the smart grid is under control and a power transmission direction between the charging / discharging device and the battery are provided. The display items of the first display are:
Whether to be under the control of the smart grid and the direction of power transmission between the charging / discharging device and the battery,
The remaining amount of the battery;
The electric vehicle according to claim 8, further comprising a lower limit of the remaining amount of the battery after discharging.

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