JP2015097441A - Charge and discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge and discharge device capable of effectively charging and discharging a storage battery while suppressing an adverse influence on a commercial electric power system during charging and discharging of the storage battery.SOLUTION: There is provided a charge and discharge device A which charges and discharges a storage battery Bt mounted on a vehicle EV, the charge and discharge device including charging and discharging means 1 connected to a commercial electric power system CS and charging and discharging the storage battery Bt, a switch 2 arranged between the commercial electric power system CS and the charging and discharging means 1, characteristic detecting means 14 of detecting characteristics of the storage battery Bt, and control means 11 of driving the switch 2 to turn ON and OFF based upon the characteristics of the storage battery Bt detected by the characteristic detecting means 14.

Description

  The present invention relates to a charging / discharging device that charges a storage battery mounted on a vehicle or the like or discharges from the storage battery.

  In recent years, for the purpose of alleviating air pollution and reducing fuel consumption, an electric vehicle (EV) driven by electric power of a storage battery and a hybrid vehicle (HV) assisting driving have started to spread. Among the electric vehicle and the hybrid vehicle, a plug-in hybrid vehicle (PHV) can be charged from a commercial power system.

  Many of the storage batteries can be charged at home outlets and can be easily charged. In such an apparatus for charging / discharging a storage battery mounted on an automobile, it is often possible to charge it indefinitely with electric power supplied from a household outlet. Therefore, when charging the storage battery, there is disclosed a charging / discharging device that has a function of acquiring identification information (ID) of the storage battery and charges the storage battery under a charging condition corresponding to the ID of the connected storage battery. (For example, Patent Document 1). By adopting such a configuration, charging to the storage battery contrary to the user's intention is suppressed, and the storage battery having an ID that cannot be identified can be charged under the charging condition intended by the user.

  In the charging / discharging device, it is also proposed to use the storage battery as an external power source by supplying electric power from the storage battery to an electrical product in the home (hereinafter referred to as a home load). Even when such a discharge is performed, it has been proposed to have a function of acquiring the ID of the storage battery and to use the storage battery as an external power source under a discharge condition corresponding to the identification information of the connected storage battery (for example, Patent Document 2). With such a configuration, it is possible to suppress the discharge of the storage battery against the user's intention, and to discharge the battery under the discharge condition intended by the user even if the storage battery has an ID that cannot be identified.

JP 2012-152034 A JP 2012-152036 A

  When charging / discharging the storage battery with the charge / discharge device, depending on the combination of the characteristics of the charge / discharge device and the characteristics of the storage battery, a problem such as oscillation of a charge / discharge current occurs, and the charge / discharge device is connected. May adversely affect the commercial power system.

  In the charging / discharging device shown in Patent Literature 1 or Patent Literature 2, since the ID of the storage battery is identified, the charging / discharging of the storage battery appropriate for the characteristics of the charging / discharging device can be performed. However, in Patent Document 1 or Patent Document 2, when the user's intention is reflected even if the ID cannot be identified, charging or discharging is configured, and charging / discharging current is generated by charging / discharging the storage battery whose ID cannot be identified. May adversely affect the commercial power system.

  Moreover, in the charging / discharging device shown in Patent Document 1 or Patent Document 2, it is possible to set so as not to completely charge or discharge a storage battery whose ID cannot be identified. However, charging / discharging is not performed even if it desires charging / discharging with respect to the storage battery which cannot identify ID, and a user's convenience worsens.

  Moreover, even if the storage battery can identify the ID of the storage battery, if there is a variation during manufacture or deterioration due to aging, a charge / discharge current may oscillate depending on the combination of the storage battery and the charge / discharge device, There is a risk of adverse effects.

  Then, an object of this invention is to provide the charging / discharging apparatus which can perform charging or discharging of the said storage battery effectively, suppressing the bad influence to the commercial power system at the time of charging / discharging of a storage battery.

  To achieve the above object, the present invention provides a charge / discharge device for charging / discharging a storage battery mounted on a vehicle, connected to a commercial power system, and charging / discharging the storage battery, and the commercial power A switch arranged between a system and the charging / discharging means, a characteristic detecting means for detecting the characteristic of the storage battery, and the switching of the switch based on the characteristic of the storage battery detected by the characteristic detecting means. And a control means for driving.

  According to this configuration, when the characteristics of the storage battery are poor, the commercial power system and the charging / discharging device are disconnected to suppress the adverse effect on the commercial power system due to the oscillation of the charging / discharging current during charging / discharging of the storage battery. Is possible.

  In the above configuration, when the characteristic detection unit detects the electrical characteristic of the storage battery and the control unit determines that the electrical characteristic of the storage battery does not satisfy a predetermined condition, the switch is opened. An operation may be performed.

  By configuring in this way, the characteristics of the connected storage battery can be determined for each individual, so that the adverse effects on the commercial power system due to the connection of storage batteries whose characteristics have changed due to deterioration or individual differences can also be suppressed. Is possible.

  In the above configuration, the characteristic detection unit can authenticate the storage battery, and the control unit opens the switch when the characteristic detection unit cannot authenticate the storage battery. You may make it perform.

  Since the switch is opened and closed by the authentication of the storage battery, it is possible to connect to the commercial power system only when a storage battery that is certified not to have an adverse effect on the commercial power system is connected. It is.

  In the above configuration, the charging / discharging unit is connected to a charging system that supplies power through a system different from the commercial power system, and the charging / discharging unit is connected to the charging system when the switch is open. You may make it charge the said storage battery with the electric power of.

  By comprising in this way, it is possible to charge a storage battery without having a bad influence on a commercial power system with respect to the storage battery which may have a bad influence on a commercial power system.

  The said structure WHEREIN: The said charging / discharging means can supply the electric power of the said storage battery to the load connected to the said commercial power system, The said charging / discharging means is the said storage battery when the said switch is in the open state. May be supplied to the load.

  By comprising in this way, it can suppress that electric power is no longer supplied to load, and it can suppress that a failure, damage, etc. of the electric equipment contained in load generate | occur | produce by not supplying electric power.

  The said structure WHEREIN: The said charging / discharging means can supply the electric power of the said storage battery to the load connected to the said commercial power system, and when the said switch is an open state, the electric power from the said storage battery is You may arrange | position so that it may not be supplied to the said load.

  According to this configuration, even when the storage battery is disconnected from the commercial power system, power is continuously supplied to the load from the commercial power system. As a result, even if the characteristics of the storage battery are poor, it is possible to suppress adverse effects on the commercial power system and to prevent power from being supplied to the electric equipment included in the load.

  ADVANTAGE OF THE INVENTION According to this invention, the charging / discharging apparatus which can charge or discharge the said storage battery effectively can be provided, suppressing the bad influence to the commercial power system at the time of charging / discharging of a storage battery.

It is a block diagram of an example of the charging / discharging system provided with the charging / discharging apparatus concerning this invention. It is a figure which shows the flow of electric power when charging the storage battery with the charging / discharging apparatus concerning this invention. It is a figure which shows the flow of electric power when discharging a storage battery in a grid connection state. It is a figure which shows the flow of electric power when discharging a storage battery in a system disconnection state. It is a figure which shows an example of the characteristic value which can permit a grid connection. It is a flowchart which shows operation | movement of the charging / discharging apparatus concerning this invention. It is a block diagram which shows the other example of the charging / discharging system provided with the charging / discharging apparatus concerning this invention. It is a flowchart which shows operation | movement of the charging / discharging apparatus shown in FIG. It is a block diagram which shows the other example of the charging / discharging system provided with the charging / discharging apparatus concerning this invention. It is a flowchart which shows operation | movement of the charging / discharging system shown in FIG. It is a block diagram which shows the further another example of the charging / discharging system provided with the charging / discharging apparatus concerning this invention. It is a figure which shows an example of the database which stored the authentication information of the storage battery. It is a flowchart which shows operation | movement of the charging / discharging system shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram of an example of a charging / discharging system including a charging / discharging device according to the present invention. FIG. 1 shows an electric system of a house equipped with a charging / discharging device A. The charging / discharging device A for charging / discharging the storage battery Bt of the electric vehicle EV, and the lighting, refrigerator, television, etc. Devices that operate (hereinafter, these devices are collectively referred to as a home load LS) are connected to the commercial power system CS (system interconnection). The charging / discharging device A performs charging operation for charging the storage battery Bt with power supplied from the commercial power system CS, and supplies power to the home load LS using the storage battery Bt mounted on the electric vehicle EV as an external power source. It has the structure which performs discharge operation.

  In the present embodiment, the commercial power system CS is a power supply network by a power supplier such as an electric power company.

  In the charging / discharging system shown in FIG. 1, the power distribution unit 2 is connected to the commercial power system CS, and the power distribution unit 3 is connected to the charger / discharger 1 (charging / discharging means) and the household load LS. Yes. In the charge / discharge system, the switch 2 is attached between the power distribution unit 3 and the commercial power system CS. The charging / discharging device A includes a charger / discharger 1 and a switch 2.

  The switch 2 is a switch that opens or closes in accordance with a signal from a switch driving unit 15 described later. In this embodiment, the switch 2 is a normally closed switch, and uses a switch that opens when a signal from the switch drive unit 15 is received. When the switch 2 is opened, the power distribution unit 3 is disconnected from the commercial power system CS. That is, when the switch 2 is opened, the charger / discharger 1 and the home load LS are disconnected from the commercial power system CS.

  The switch 2 may be in an open state while receiving a signal from the switch driving unit 15. When the switch driving unit 15 is configured to transmit an open signal and a close signal, the switch 2 maintains the open state after receiving the open signal, and maintains the closed state after receiving the close signal. The thing of such a structure is employable.

  The power distribution unit 3 is connected to the commercial power system CS, and the domestic load LS and the charger / discharger 1 are connected to the power distribution unit 3. In FIG. 1, the home load LS is shown as a single load. However, in practice, the loads are divided into a plurality of systems for each area in the house or according to the load size.

  Next, the charger / discharger 1 will be described. As shown in FIG. 1, the charger / discharger 1 includes a control unit 11 (control unit), a bidirectional AC / DC conversion unit (inverter) 12, a bidirectional DC / DC conversion unit 13, and a measurement unit 14 (characteristic detection unit). , A switch drive unit 15, a display unit 16, a charging cable 17 and a charging plug 18.

  The control unit 11 comprehensively controls the operation of the charger / discharger 1, and includes a bidirectional AC / DC conversion unit 12, a bidirectional DC / DC conversion unit 13, a measurement unit 14, a switch driving unit 15, and a display. Signals are exchanged with the unit 16. The control unit 11 performs arithmetic processing, and includes arithmetic processing units such as a CPU and an MPU.

  The bidirectional AC / DC converter 12 is a converter for converting alternating current into direct current or direct current into alternating current. The bidirectional DC / DC converter 13 is a converter for converting a direct current into a direct current of an arbitrary voltage. The bidirectional AC / DC converter 12 is connected to the power distribution unit 3, and the bidirectional DC / DC converter 13 is connected to the charging cable 17. In the actual charger / discharger 1, the bidirectional AC / DC conversion 12 and the power distribution unit 3 are connected by electrically connecting the charger / discharger 1 and the power distribution unit 3 using electric wires or the like. It has become.

  Thus, the charger / discharger 1 connects the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13 in series, thereby converting the alternating current supplied through the power distribution unit 3 into direct current, Furthermore, the direct current is converted into a direct current of a predetermined voltage. Further, the direct current supplied from the rechargeable battery Bt of the electric vehicle EV via the charging cable 17 is converted into a direct current of a predetermined voltage, and further converted into alternating current (voltage, frequency, etc.) that can be supplied to the home load LS. .

  That is, the charger / discharger 1 converts the alternating current supplied from the commercial power system CS into a direct current suitable for charging the storage battery Bt using the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13. it can. Moreover, the direct current supplied from the storage battery Bt can be converted into an alternating current suitable for the operation of the home load LS. Note that the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13 are well known in the art and will not be described in detail.

  The measurement part 14 is arrange | positioned between the bidirectional | two-way DC / DC conversion part 13 and the charging cable 17, and contains the measuring apparatus which measures the characteristic of the storage battery Bt mounted in the electric vehicle EV. The measurement unit 14 measures characteristic values for determining basic performance, deterioration, and the like of the storage battery Bt. In the present embodiment, the output voltage and the resistance component value are given as the characteristic values measured by the measurement unit 14, but are not limited thereto. A characteristic value (physical value) that can evaluate charging and / or discharging of the storage battery Bt can be widely adopted.

  In addition, since the measurement unit 14 is configured to measure the voltage value and resistance component value of the storage battery Bt as described above, the control unit 11 determines that the charging plug 18 is based on the information transmitted from the measurement unit 14. It is also possible to detect that the battery is connected to the connector of the electric vehicle EV, that is, the storage battery Bt is connected.

  Further, when the measurement unit 14 performs charging, the power output from the bidirectional DC / DC conversion unit 13 to the storage battery Bt may be measured. The measurement unit 14 measures the current value and voltage value of the power supplied to the storage battery Bt, and transmits them to the control unit 11. Based on the received current value and voltage value, the control unit 11 controls the bidirectional AC / DC conversion unit 12 and / or the bidirectional DC / DC conversion unit 13 so as to have a value suitable for charging the storage battery Bt. It is also possible to do. By doing in this way, the charging accuracy of the storage battery Bt by the charger / discharger 1 can be improved, and deterioration of the storage battery Bt, charging failure, etc. can be suppressed.

  The switch driving unit 15 is connected to the control unit 11 and transmits a signal for opening and closing the switch 2 in accordance with an instruction from the control unit 11. In the charger / discharger 1 shown in FIG. 1, the switch drive unit 15 has a configuration (circuit, element, etc.) independent of the control unit 11, but is formed as a part of the control unit 11. There may be. Further, the switch drive unit 15 has a configuration completely independent from the control unit 11 and directly acquires information from the measurement unit 14 and determines whether the switch 2 is opened or closed based on the information. Good. In this case, the switch drive unit 15 serves as a control means.

  The display unit 16 is connected to the control unit 11 and notifies the user of the characteristics of the charger / discharger 1. As the display unit 16, for example, a display panel having a display panel such as a liquid crystal panel may be used. For example, a state such as a charging state, a discharging state, a grid connection state, a system disconnection state, etc. The display form may be as shown. Moreover, the charger / discharger 1 may include an operation unit (not shown). By providing the operation unit, the charger / discharger 1 can be manually operated according to the user's request. In addition, even if an operation that adversely affects the commercial power system CS or an increase in the risk to the storage battery Bt is input to the charger / discharger 1, it is safe to prevent the input operation from being performed. It is preferable that the function is provided.

  The charging cable 17 is a charging / discharging cable exposed to the outside of the charger / discharger 1, and electricity flows when charging the storage battery Bt or discharging the storage battery Bt. The charging cable 17 is a cable that can supply electric power suitable for charging and discharging the storage battery Bt. A charging plug 18 is attached to the tip of the charging cable 17. The charging plug 18 is a plug connected to a charging connector (not shown) provided in the electric vehicle EV, and has a configuration that can be engaged with the charging connector.

  In addition, in FIG. 1, although the charging cable 17 shall be provided in the charger / discharger 1, it is not limited to this. For example, a charging cable may be provided in the electric vehicle EV, and the charging plug may be connected to the charger / discharger 1. Furthermore, the charging cable may be independent of the charger / discharger 1 and the electric vehicle EV, and the self-charge / discharger 1 and the electric vehicle EV may be connected when the storage battery Bt is charged / discharged.

  A charging / discharging operation of a storage battery mounted on an electric vehicle by the charging / discharging device according to the present invention will be described with reference to the drawings. The charging / discharging device A according to the present invention includes the switch 2 that can disconnect the power distribution unit 3 and the commercial power system CS, and thus has a plurality of operation modes depending on the open / close state of the switch 2. ing. The operation mode of the charging / discharging device A will be described for each switching state of the switch 2. The grid connection state is when the switch 2 is closed and the charger / discharger 1 is connected to the commercial power system CS. The grid disconnection state is when the switch 2 is opened, It is assumed that the charger / discharger 1 is disconnected from the commercial power system CS.

  FIG. 2 is a diagram showing the flow of power when the storage battery is charged by the charging / discharging device according to the present invention, and FIG. 3 is a diagram showing the flow of power when discharging the storage battery in the grid connection state. FIG. 4 is a diagram showing the flow of electric power when discharging the storage battery in the system disconnection state. In each figure, the flow of electric power is displayed using a thick broken line.

  First, the case where the storage battery Bt is charged will be described. The charger / discharger 1 charges the storage battery Bt with the power supplied from the commercial power system CS when the storage battery Bt has little remaining power (hereinafter sometimes referred to as a grid-connected charging mode). As shown in FIG. 2, in the grid connection charging mode, the switch 2 is closed, and the power from the commercial power system CS is supplied to the power distribution unit 3. In the grid connection mode, the power supplied to the power distribution unit 3 is supplied to the home load LS. At this time, the operations of the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13 are appropriately controlled so that power is supplied from the power distributor 3 to the charger / discharger 1. Thereby, the rechargeable battery Bt is charged with the electric power from the commercial power system CS.

  As described above, in the grid interconnection charging mode, power from the commercial power grid CS is supplied to the home load LS and used for charging the storage battery Bt.

  In the charging / discharging device A, the storage battery Bt mounted on the electric vehicle EV can be used as an external power source, and an operation of interpolating a part of the power consumption of the home load LS can be performed (hereinafter referred to as a grid interconnection discharge mode). ). The power consumption of the household load LS varies depending on the life in the home, and the time zone where the power consumption is high and the time zone where the power consumption is low often fluctuate so as to be the same time zone to some extent. Moreover, since the power consumption of the household load LS fluctuates in an approximate manner for many electric power consumers (homes), when it reaches the maximum peak, the burden on the commercial power system CS increases, and when it reaches the minimum peak Surplus power increases.

  Therefore, as shown in FIG. 3, the charging / discharging device A uses the storage battery Bt mounted on the electric vehicle EV, so that the power consumption of the home load LS is low (that is, the commercial power system CS has surplus power). Charge the battery at a high time). Then, the maximum value (peak value) of the power consumption of the home load LS is reduced (shifted) by supplying power from the storage battery Bt to the home load LS during a time period when the power consumption of the home load LS is large. Can do.

  In the grid connection discharge mode, the switch 2 is in a closed state. At this time, power is supplied from the commercial power system CS to the power distribution unit 3. Moreover, the control part 11 of the charger / discharger 1 operates the bidirectional DC / DC conversion part 13 and the bidirectional AC / DC conversion part 12, converts the direct current of the storage battery Bt into alternating current, and supplies it to the shunt 3 (storage battery). Bt is discharged). The shunt 3 mixes the power from the commercial power system CS and the power from the storage battery Bt supplied via the charger / discharger 1 and supplies the load LSn in the home. Thereby, the power supply amount from the commercial power system CS can be reduced.

  As shown in FIG. 4, when the switch 2 is opened, the commercial power system CS and the power distribution unit 3, that is, the home load LS and the charger / discharger 1 are disconnected from the commercial power system CS. . At this time, power from the commercial power system CS is not supplied to the home load LS and the charger / discharger 1.

  In this state, the charger / discharger 1 supplies power to the home load LS by supplying the power of the storage battery Bt to the power distribution unit 3 using the storage battery Bt mounted on the electric vehicle EV as an external power source. Possible (system disconnection discharge mode). By using the system disconnection discharge mode in this way, even when disconnected from the commercial power system CS, the power from the storage battery Bt can be supplied to the home load LS, and the home load LS It is possible to drive. As a case where such a system disconnection discharge mode is used, for example, a case where power from the commercial power system CS is unstable due to a lightning strike or disconnection of the commercial power system CS can be cited. Moreover, the case where an adverse effect is given to the commercial power system CS by the discharge from the storage battery Bt can also be mentioned.

  Next, a case where each mode is used will be described. The bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13 of the charger / discharger 1 perform AC / DC conversion and DC / DC conversion by pulse width modulation (PWM) control. When the storage battery Bt is charged by the charger / discharger 1 or when the storage battery Bt is discharged, noise such as harmonics is likely to occur, and the commercial power system CS (electricity flowing through) tends to be adversely affected. Such noise varies depending on the configuration of the storage battery Bt, the bidirectional AC / DC converter 12 and / or the bidirectional DC / DC converter 13, and the characteristics of the storage battery Bt.

  Therefore, the following operation is performed in the charging / discharging device A according to the present invention. First, when the charging plug 18 is connected to the electric vehicle EV, the measurement unit 14 acquires a characteristic value (here, output voltage and resistance component value) of the storage battery Bt, and sends the result to the control unit 11. The control unit 11 determines whether or not the grid connection of the charging / discharging device A (that is, the storage battery Bt) can be permitted or not based on the transmitted characteristic value.

  Specifically, it is performed as follows. FIG. 5 is a diagram showing an example of characteristic values that can permit grid connection, and FIG. 6 is a flowchart showing the operation of the charge / discharge device according to the present invention. As shown in FIG. 6, the control unit 11 determines whether the charging plug 18 is connected to the electric vehicle EV, that is, whether the storage battery Bt is connected based on the information from the measurement unit 14 (step S101). In the charging / discharging device A, the measurement unit 14 measures the characteristic value at all times or at regular intervals, and transmits the measurement result to the control unit 11. The control unit 11 determines whether or not the storage battery Bt is connected based on the variation in the measurement result.

  When the storage battery Bt is not connected (No in step S101), the detection of the connection of the storage battery Bt is repeated. When the connection of the storage battery Bt is detected (Yes in Step S101), the characteristic value (voltage value, resistance component value) of the storage battery Bt connected by the measurement unit 14 is measured (Step S102), and the control unit 11 Transmit (step S103).

  As described above, when the storage battery Bt is charged or discharged by the charger / discharger 1, the charge / discharge current (current flowing during charging or discharging) may oscillate (generate harmonics) depending on the characteristics of the storage battery Bt. When the charge / discharge current oscillates in the grid connection state, the commercial power system CS is adversely affected. Therefore, the controller 11 of the charger / discharger 1 determines whether the characteristics of the storage battery Bt may be grid-connected.

  More specifically, the charger / discharger 1 includes a storage unit (not shown) such as a memory, and the storage unit Bt can suppress oscillation of the charge / discharge current (allows grid connection). A database Db1 including the condition value characteristic values is stored. As shown in FIG. 5, the database Db1 stored in the storage unit is, for example, V1 or more and V2 or less as a condition of an output voltage value in which charging / discharging current does not occur (or hardly occurs) in the charging / discharging device 1, As a condition, information below R1 is provided.

  Then, the control unit 11 calls the characteristic value information from the database Db1, and compares the characteristic measurement values received from the measurement unit 14 (here, the voltage value V0 and the resistance value R0) (step S104).

  Then, the control unit 11 determines whether or not the characteristic measurement value satisfies a condition for permitting grid connection called from the database Db1 (step S105). That is, the control unit 11 determines whether the acquired voltage value V0 is within the range of the voltage V1 to V2 and the resistance value R0 is equal to or less than the resistance component value R1.

  When the characteristic measurement values (V0, R0) satisfy the conditions for permitting the grid connection of the database Db1 (Yes in step S105), the control unit 11 controls the storage battery Bt connected by the charger / discharger 1. It is determined that current oscillation is suppressed even when charging or discharging is performed. That is, the control unit 11 determines that the grid connection between the charger / discharger 1 and the commercial power system CS can be permitted.

  And the control part 11 sends the instruction | indication which closes the switch 2 to the switch drive part 15, and the switch drive part 15 transmits the signal which closes to the switch 2 (step S106). When the switch 2 is a normally closed switch, the switch 2 is already in a closed state, so that a signal for performing a closing operation is not sent to the switch 2 even when an instruction to close the switch is received from the control unit 11. Alternatively, the switch drive unit 15 may be configured. Further, the control unit 11 may not send an instruction. At this time, the control unit 11 sends an instruction to the display unit 16 and displays on the display unit 16 that the system is connected.

  The controller 11 determines whether or not the storage battery Bt needs to be charged based on the information measured by the measuring unit 14 in a state where the charger / discharger 1 is connected to the commercial power system CS (step S107). . The control unit 11 determines that the storage battery Bt needs to be charged when the remaining charge amount of the storage battery Bt is less than the specified value. At this time, the specified value may be stored in the storage unit.

  Normally, the electric vehicle EV is connected to the charging / discharging device A to charge the storage battery Bt when the remaining amount of the storage battery Bt decreases, but is charged / discharged after the charging to the storage battery Bt is completed. Since it may be connected to the electric appliance 1 or may be connected for the purpose of discharging, it is confirmed whether charging is necessary.

  When charging is necessary (in the case of Yes in step S107), the control unit 11 controls the bidirectional AC / DC conversion unit 12 and the bidirectional DC / DC conversion unit 13 to convert the alternating current from the power distribution unit 2 into direct current. Instead, the storage battery Bt is charged (step S108). That is, the charging / discharging device A operates in a grid-connected charging mode (see FIG. 2) in which the storage battery Bt is charged while maintaining the grid connection between the charger / discharger 1 and the commercial power system CS. At this time, an instruction is sent from the control unit 11 to the display unit 16 to display on the display unit 16 that it is operating in the grid connection charging mode.

  On the other hand, when the remaining charge amount of the storage battery Bt is sufficiently large with respect to the specified value (No in step S107), whether the control unit 11 needs to supply power to the home load LS, that is, the storage battery. It is determined whether or not the discharge of Bt is necessary (step S109). In a state where the grid is connected to the commercial power grid CS, the household load LS is supplied with power from the commercial power grid CS.

  As described above, when the power consumption of the home load LS reaches a peak, the power from the storage battery Bt is supplied to the home load LS to reduce (shift) the peak. Therefore, what is necessary is just to judge whether the present time is the time when the power consumption of the household load LS becomes a peak as judgment whether the discharge of the storage battery Bt by the control part 11 is required. Moreover, it is not limited to this, The judgment method whether the discharge of the storage battery Bt is required can be employ | adopted widely. Moreover, you may make it judge whether discharge is possible according to the state of the storage battery Bt.

  When the storage battery Bt needs to be discharged (Yes in step S109), the control unit 11 causes the bidirectional DC / DC conversion unit 13 and the bidirectional AC / DC conversion unit 12 to operate in the reverse manner during charging, The DC power from the storage battery Bt is converted into AC power, and discharging is started toward the power distribution unit 3 (step S110). In the power distribution unit 3, the power from the charger / discharger 1 and the power from the commercial power system CS are mixed and supplied to the home load LS. That is, the charging / discharging device A operates in a grid-connected discharge mode (see FIG. 3) in which the storage battery Bt is discharged while maintaining the grid connection between the charger / discharger 1 and the commercial power system CS. At this time, an instruction is sent from the control unit 11 to the display unit 16 to display on the display unit 16 that it is operating in the grid interconnection discharge mode.

  Further, in the case where discharging is not necessary because the power consumption of the home load LS is deviated from the peak time (No in step S109), the control unit 11 does not charge or discharge the storage battery Bt. (Step S111).

  Further, when the characteristic measurement values (V0, R0) transmitted from the measurement unit 14 do not satisfy the condition for permitting the grid connection of the database Db1 (No in Step S105), the control unit 11 When the storage battery Bt connected to 1 is charged or discharged, it is determined that there is a possibility of adversely affecting the commercial power system CS. That is, the control unit 11 determines that the grid connection between the charger / discharger 1 to which the storage battery Bt is connected and the commercial power system CS cannot be permitted.

  And the control part 11 sends the instruction | indication which opens the switch 2 to the switch drive part 15, and the switch drive part 15 transmits the signal which opens to the switch 2. FIG. Thereby, the switch 2 will be in an open state (step S112). When the switch 2 is a normally open switch, the switch 2 is already in an open state, so that a signal for performing an opening operation is not sent to the switch 2 even when an instruction to close the switch is received from the control unit 11. Alternatively, the switch drive unit 15 may be configured. Further, the control unit 11 may not send an instruction. At this time, an instruction is sent from the control unit 11 to the display unit 16 and the display unit 16 displays that the system is disconnected.

  When the switch 2 is opened and closed, the control unit 11 determines whether or not the storage battery Bt can be discharged based on the information on the characteristics of the storage battery Bt received from the measurement unit 14 (step S113). In addition, as the case where discharge is impossible, when the remaining charge amount of the connected storage battery Bt is small, or the output voltage is too low or too high, it is not possible to supply a voltage or current that can drive an electrical device included in the home load LS Cases can be mentioned. However, the present invention is not limited to this.

  When the storage battery Bt can be discharged (Yes in step S113), the control unit 11 operates to discharge the bidirectional DC / DC conversion unit 13 and the bidirectional AC / DC conversion unit 12, and from the storage battery Bt. Electric power is supplied to the household load LS (step S114). That is, the charging / discharging device A operates in a system disconnection discharge mode (see FIG. 4) in which the storage battery Bt is discharged with the charger / discharger 1 and the commercial power system CS disconnected. At this time, an instruction is sent from the control unit 11 to the display unit 16 to display on the display unit 16 that it is operating in the system disconnection discharge mode.

  Further, when the storage battery Bt cannot be discharged (No in step S113), the control unit 11 is not charged / discharged of the storage battery Bt in the system disconnection state with respect to the display unit 16, and the household load LS is applied. Send an instruction to display a warning that power is not being supplied. The display unit 16 displays a warning that the storage battery Bt has not been charged / discharged and power is not supplied to the home load LS (step S115). In addition, the charger / discharger 1 includes a storage battery (not shown), and performs display on the display unit 16 and operation of each unit by the power of the storage battery. Further, the display unit 16 may not only display a warning, but may display a state of a charge / discharge system such as grid connection, grid disconnection, charge, discharge, and the like.

  Moreover, the following are mentioned as operation | movement of the charging / discharging apparatus A after giving a warning to the display part 16, for example. After giving a warning on the display unit 16, the control unit 11 stops the operation of the charger / discharger 1. And the control part 11 sends the instruction | indication which closes the switch 2 to the switch drive part 15 in the state which eliminated or suppressed the influence on the commercial power grid | system CS by the storage battery Bt. The switch 2 is closed when the switch drive unit 15 transmits a close signal to the switch 2. As a result, the home load LS is connected to the commercial power system CS, and power from the commercial power system CS is supplied. By doing in this way, the time when the electric power is not supplied to the household load LS can be shortened by the opening operation of the switch 2, and problems due to the electric power not being supplied can be reduced.

  The operation of the charging / discharging device A of the present invention described above is summarized as follows. In the charging / discharging device A, when the charging plug 18 is connected to the electric vehicle EV, the measuring unit 14 measures the characteristic values (voltage value, resistance component value) of the storage battery Bt. And the control part 11 judges whether the charger / discharger 1, ie, the storage battery Bt, may be connected with the commercial power grid | system CS (system connection) based on the measured value. And the control part 11 sends the instruction | indication of the operation | movement (opening operation or closing operation) of the switch 2 to the switch drive part 15 based on the determination result. The switch driving unit 15 transmits a signal for driving the switch 2 to the switch 2 in accordance with the received instruction. Thereby, the switch 2 connects (system connection) or disconnects (system disconnection) the power distribution unit 3 and the commercial power system CS according to the determination of the control unit 11.

  Since the switch 2 is used to open and close the wiring, it is possible to reliably perform system interconnection and system disconnection between the charger / discharger 1 and the commercial power system CS. Thereby, the characteristic value of the storage battery Bt is out of the range that can be charged by the charging / discharging device A, or the storage battery Bt is deteriorated, thereby suppressing the adverse effect on the commercial power system CS due to the oscillation of the charging / discharging current. it can.

  In the present embodiment, the switch 2 and the power distribution unit 3 are independent of each other, but the switch 2 and the power distribution unit 3 may be integrally formed. In addition, when the switch provided in the power distribution unit 3 can be controlled to be opened and closed by an external signal, wiring is performed so that the signal of the switch drive unit 15 is input to the switch provided in the power distribution unit 3. Thus, the switch 2 can be omitted.

  Furthermore, although the charging / discharging apparatus A concerning this embodiment shall charge or discharge the electrical storage location Bt of the electric vehicle EV, it is not limited to this, Even if it is a charging apparatus which performs only charge Similarly, adverse effects on the commercial power system CS can be suppressed.

  In the above description, the electric vehicle EV is mentioned as the device including the storage battery Bt that is charged and discharged by the charging / discharging device A, but is not limited to this, and for example, a plug-in hybrid vehicle (PHV), electric Bikes can also be listed. Devices that include a storage battery that can supply power for operating the electric devices included in the household load LS and that can be attached to and detached from the charger / discharger 1 can be widely used.

(Second Embodiment)
Another example of the charge / discharge device according to the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing another example of a charge / discharge system including the charge / discharge device according to the present invention, and FIG. 8 is a flowchart showing the operation of the charge / discharge device shown in FIG. The charge / discharge system shown in FIG. 7 includes a second switch 22 between the charger / discharger 1 and the power distribution unit 3. For convenience of explanation, the switch 2 will be described as the first switch 21. The substantially same parts other than these are denoted by the same reference numerals, and detailed description of the same parts is omitted. Moreover, the flowchart shown in FIG. 8 shows an operation when performing systematic discontinuation, and shows an operation when performing system discontinuation in a portion after step 105 of the flowchart shown in FIG.

  In the charge / discharge system shown in FIG. 1, when the connected storage battery Bt cannot permit grid connection with the commercial power grid CS, the switch 2 is opened. Thereby, the charger / discharger 1 and the home load LS are in a state of being disconnected from the commercial power system CS (system disconnection). At this time, if the storage battery Bt cannot be discharged, the supply of power to the home load LS is stopped.

  When the supply of power to the household load LS is stopped, the function may not be sufficiently performed as in a refrigerator, for example. In addition, even if the power is stopped for a short time, there is a device in which data and the device main body are damaged, or initial settings such as time setting are lost. That is, stopping the supply of power to the home load LS is not preferable even for a short time. Therefore, the charging / discharging device B of the present embodiment includes a first switch 21 and a second switch 22 in order to suppress the stop of power supply to the household load LS. In the charging / discharging device B shown in FIG. 7, the second switch 22 is a normally closed switch, like the first switch 21, and is opened and closed based on a drive signal from the switch drive unit 15.

  In charging / discharging device B, measurement unit 14 measures the characteristic value of storage battery Bt (S101 to S104 in FIG. 6). And based on the information from the measurement part 14, the control part 11 judges whether a grid connection is permitted (step S105 of FIG. 6). When permitting grid connection, the storage battery Bt is charged or discharged by the same operation as in step S106 and subsequent steps in FIG.

  When the characteristic measurement values (V0, R0) do not satisfy the condition for permitting grid connection in the database Db1, the control unit 11 determines whether the storage battery Bt can be discharged based on the characteristic measurement values from the measurement unit 14. (Step S201). When the storage battery Bt can be discharged (Yes in step S201), the control unit 11 sends an instruction to open the first switch 21 to the switch driving unit 15. When receiving the instruction, the switch driving unit 15 transmits an open signal for opening the first switch 21, and the first switch 21 that has received the open signal enters an open state (step S202).

  And the control part 11 drives the bidirectional | two-way DC / DC conversion part 13 and the bidirectional | two-way AC / DC conversion part 12, converts the direct current from the storage battery Bt into alternating current, and supplies (discharges) to the household load LS. (Step S203). At this time, an instruction is sent from the control unit 11 to the display unit 16, and the display unit 16 displays that the system is in the system disconnection discharge mode. Thereby, electric power is supplied to the household load LS using the storage battery Bt as an external power source.

  When the storage battery Bt is not configured to be discharged (No in step S201), the control unit 11 sends an instruction to open the second switch 22 to the switch driving unit 15. Upon receiving the instruction, the switch drive unit 15 transmits an open signal for opening the second switch 22, and the second switch 22 that has received the open signal enters an open state (step S204). And the control part 11 sends the instruction | indication which displays the warning to the effect that charging / discharging of the storage battery Bt is not performed with respect to the display part 16. FIG. Accordingly, a warning that the storage battery Bt is not charged / discharged in the system disconnection state is displayed on the display unit 16 (step S205).

  When charging / discharging device B is disconnected from commercial power system CS, charging / discharging device B selects whether to disconnect only charging / discharging device 1 or to simultaneously disconnect charging / discharging device 1 and domestic load LS. be able to. Therefore, even when the storage battery Bt cannot be charged / discharged, the storage battery Bt can be disconnected from the commercial power system CS so that the supply of power to the home load LS is not interrupted.

  Moreover, when the storage battery Bt is performing grid connection charging or grid connection discharge, if the characteristics of the storage battery Bt deviate from the conditions that allow the system connection, the power supply to the home load LS is interrupted. It is also possible to disconnect the storage battery Bt from the commercial power system CS.

  Other configurations and features are the same as those of the charge / discharge device of the first embodiment.

(Third embodiment)
Still another example of the charge / discharge system including the charge / discharge device according to the present invention will be described with reference to the drawings. FIG. 9 is a block diagram showing another example of the charge / discharge system including the charge / discharge device according to the present invention, and FIG. 10 is a flowchart showing the operation of the charge / discharge system shown in FIG. The charge / discharge device C shown in FIG. 9 includes the charger / discharger 1c, the solar cell 4, the solar cell DC / DC conversion unit 41, and the second measurement unit 142, and the charge / discharge shown in the first embodiment. The configuration is the same as that of apparatus A, and description of substantially the same parts is omitted, and detailed description is also omitted. Further, the flowchart shown in FIG. 10 shows an operation when performing systematic discontinuation, and shows an operation when performing system discontinuation in a portion after step 105 of the flowchart shown in FIG.

  As shown in FIG. 9, the charging / discharging device C includes a solar battery 4, which is a power supply source of a system different from the commercial power system CS, via a solar battery DC / DC conversion unit 41. It is connected to the. The solar cell 4 is well known in the past, and includes a solar panel that generates power when irradiated with light (mainly sunlight).

  The solar cell 4 generates direct-current electricity, and the voltage is converted by the solar cell DC / DC converter 41. In FIG. 9, the solar cell DC / DC converter 41 is connected between the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13. The direct current from the solar cell DC / DC converter 41 can be supplied to the bidirectional AC / DC converter 12 or the bidirectional DC / DC converter 13. The solar cell DC / DC converter 41 is provided to send electricity generated by the solar cell 4 to the charger / discharger 1c, and is only in one direction from the solar cell 4 toward the charger / discharger 1c. It has a configuration in which electricity flows.

  In FIG. 9, the wiring from the solar power generation DC / DC converter 41 is directly connected between the bidirectional AC / DC converter 12 and the bidirectional DC / DC converter 13. In practice, however, the connection is made by wiring to the connecting portion provided in the outer case of the charger / discharger 1c.

  And the 2nd measurement part 142 for measuring the electric power (voltage, electric current) supplied from the solar cell 4 is provided in the inside of the charger / discharger 1c. The second measurement unit 142 is connected to the control unit 11, and transmits the result measured by the second measurement unit 142 to the control unit 11. Based on the information from the second measurement unit 142, the control unit 11 acquires that the solar cell 4 is generating power and information on the power value from the solar cell 4. Since it is set as such a structure, the charger / discharger 1c can charge the storage battery Bt with the electric power from the commercial power system CS, and can charge the storage battery Bt with the electric power from the solar battery 4. The charger / discharger 1c also has a configuration capable of supplying power from the solar cell 4 to the home load LS.

  About the operation | movement of the grid connection of the charger / discharger 1c, it is the same as 1st Embodiment. Therefore, the operation of the charger / discharger 1c when performing system disconnection will be described below with reference to FIG. When the characteristics of the storage battery Bt do not satisfy the condition for permitting grid connection (No in step S105), the control unit 11 sends an instruction to open the switch 2 to the switch drive unit 15. Upon receiving the instruction, the switch drive unit 15 transmits an open signal for opening the switch 2, and the switch 2 that has received the open signal enters an open state (step S301).

  Thereafter, the control unit 11 determines whether power is supplied from the solar cell 4 based on information from the second measurement unit 142, that is, whether the solar cell 4 is generating power (step S302). When the solar cell 4 is generating electric power (Yes in Step S302), the control unit 11 determines whether or not the storage battery Bt needs to be charged based on the upper side from the measurement unit 14 (Step S303).

  When the storage battery Bt needs to be charged (Yes in step S303), the control unit 11 operates the bidirectional AC / DC conversion unit 12 so as to convert direct current into alternating current. Similarly, the bidirectional DC / DC converter 13 is operated so as to convert direct current into a voltage necessary for charging the storage battery Bt. By operating in this way, the electric power generated by the solar cell 4 is supplied to the home load LS and the storage battery Bt is charged (step S304). At this time, the display unit 16 displays that the electric power from the solar cell 4 is supplying power to the home load LS and charging the storage battery Bt.

  Further, when charging of the storage battery Bt is unnecessary (No in Step S303), the control unit 11 determines whether or not the storage battery Bt can be discharged based on the information from the measurement unit 14 (Step S305). When the storage battery Bt can be discharged (Yes in step S305), the control unit 11 operates the bidirectional DC / DC conversion unit 13 to supply the direct current from the storage battery Bt to the bidirectional AC / DC conversion unit 12. It is converted to direct current with a voltage suitable for. In addition, the control unit 11 uses the bidirectional AC / DC conversion unit 12 with the power supplied from the solar cell 4 (solar cell DC / DC conversion unit 41) and the power supplied from the bidirectional DC / DC conversion unit 13. Is converted into an alternating current that can be supplied to the home load LS. Thereby, the electric power from the solar cell 4 and the electric power from the storage battery Bt can be supplied to the household load LS (step S306). At this time, the display unit 16 displays that power is being supplied from the solar cell 4 and the storage battery Bt to the home load LS.

  Furthermore, when the storage battery Bt is not dischargeable (No in step S305), the bidirectional AC / DC conversion unit 12 is operated to supply power from the solar battery 4 to the home load LS (step S307). At this time, the display unit 16 displays that the power from the solar battery 4 is being supplied to the home load LS.

  When the solar cell 4 is not generating electric power (No in step S302), the control unit 11 determines whether or not the storage battery Bt can be discharged based on information from the measurement unit 14 (step S308).

  When the storage battery Bt can be discharged (Yes in step S308), the control unit 11 operates the bidirectional DC / DC conversion unit 13 and the bidirectional AC / DC conversion unit 12, and uses the electric power from the storage battery Bt in the home. Supply to the load LS (step S309). At this time, the display unit 16 displays that it is operating in the system disconnection discharge mode.

  Further, when the storage battery Bt cannot be discharged (No in step S308), the control unit 11 is not charged / discharged of the storage battery Bt in the system disconnection state with respect to the display unit 16, and the household load LS is applied. Send an instruction to display a warning that power is not being supplied. The display unit 16 displays a warning that the storage battery Bt is not charged / discharged and power is not supplied to the home load LS (step S310).

  As described above, by using the power receiving / discharging device C, it is possible to effectively use power from a power supply system different from the commercial power system CS such as the solar battery 4. Further, even when the connected storage battery Bt is likely to be deteriorated or adversely affect the commercial power system CS outside the standard, it is possible to charge with the electric power from the solar cell 4.

  In addition, although the solar cell 4 is mentioned as an electric power supply system different from the commercial electric power system CS, it is not limited to this, For example, electric power supply systems, such as a wind power generation and a fuel cell, can be mentioned. Moreover, in this embodiment, although the solar cell DC / DC conversion part 41 for converting the electric power generated of the solar cell 4 is connected to the charger / discharger 1c, it is not limited to this. The power distribution unit 3 may be connected to the power distribution unit 3 using a power conditioner. At this time, the charging / discharging device C may be connected to the power distribution unit 3 with the above-described configuration, but the bidirectional AC / DC conversion unit 12 is omitted and the direct current from the bidirectional DC / DC conversion unit 13 is omitted. Even if it is connected so that can be supplied to the power conditioner, the same effect can be obtained. About the characteristic other than this, it has the same structure as 1st Embodiment and 2nd Embodiment.

  Moreover, in this embodiment, while supplying the electric power from the solar cell 4 to the household load LS and charging the storage battery Bt, it is not limited to this. For example, in addition to supplying electric power from the solar battery 4 to the home load LS and charging the storage battery Bt, a reverse power flow to the commercial power system CS may be performed. Moreover, you may make it use the electric power from the solar cell 4 only for charge of the storage battery Bt.

(Fourth embodiment)
A charging / discharging system including still another example of the charging / discharging device according to the present invention will be described with reference to the drawings. FIG. 11 is a block diagram showing still another example of a charge / discharge system including the charge / discharge device according to the present invention, FIG. 12 is a diagram showing an example of a database storing authentication information of a storage battery, and FIG. It is a flowchart which shows operation | movement of the charging / discharging system shown in FIG. The charging / discharging device D shown in FIG. 11 includes an authentication information acquisition unit 143 instead of the measurement unit 14 in the charger / discharger 1d and a signal wiring 172 that connects the authentication information acquisition unit 143 and the storage battery Bt. Except for being, it has the same structure as the charging / discharging apparatus A shown in FIG. Therefore, substantially the same parts as those of the charging / discharging device A are denoted by the same reference numerals, and detailed description of the same parts is omitted.

  Each storage battery Bt has unique recognition information (recognition ID) for theft prevention and the like, and it is possible to acquire the recognition information by using a dedicated device. By examining the recognition information, information on the storage battery Bt such as the characteristics of the storage battery Bt, the manufacturer, the date of manufacture, etc. can be obtained. When the storage battery Bt is charged by the charger / discharger 1d, the commercial power system CS It is possible to determine whether it will adversely affect

  Therefore, the charging / discharging device D determines whether the storage battery Bt is to be grid-connected to the commercial power grid CS or to be grid-disconnected in the procedure as shown in FIG. The flowchart shown in FIG. 13 is obtained by replacing steps S102 to S105 in the flowchart shown in FIG. 6 with steps S402 to S404. Therefore, in the following description, steps S402 to S404 are described.

  When it is detected that the storage battery Bt is connected (Yes in step S101), the authentication information acquisition unit 143 acquires the recognition information of the storage battery Bt (step S402). The authentication information acquisition unit 143 acquires the recognition information via the signal wiring 172. In FIG. 11, the charging cable 17 and the signal wiring 172 are displayed independently. However, in reality, the charging cable 17 and the signal wiring 172 may be included in one cable, or wiring for exchanging power may be used. You may make it transmit / receive recognition information using.

  The recognition information acquisition unit 143 transmits the acquired recognition information to the control unit 11. The control unit 11 searches the database Db2 (see FIG. 12) based on the sent recognition information (step S403). The database Db2 is stored in a storage unit (not shown), and stores a plurality of recognition information (ID). This recognition information may be provided in the charger / discharger 1d in advance, or may be input by the user. Further, the database Db2 may be changed using the Internet or the like.

  When the sent recognition information is in the database Db2 (Yes in step S404), the control unit 11 determines that the storage battery Bt that can permit grid connection is connected, and opens / closes to the switch drive unit 15 An instruction to close the container 2 is sent. The switch drive unit 15 transmits a close signal to the switch 2, and the switch 2 that has acquired the close signal enters a closed state (step S106).

  If the sent recognition information is not in the database Db2 (No in step S404), the control unit 11 determines that the storage battery Bt that cannot permit grid connection is connected, and the switch drive unit 15 An instruction to open switch 2 is sent. The switch drive unit 15 transmits an open signal to the switch 2, and the switch 2 that has acquired the open signal is in an open state (step S112).

  As described above, the charger / discharger 1d acquires the recognition information of the storage battery Bt and searches for the recognition information, so that the source (manufacturer, manufacturing place) of the storage battery Bt mounted on the connected electric vehicle EV is obtained. , Manufacturing date, etc.) can be obtained accurately. Thereby, the charging / discharging apparatus D can suppress the bad influence to the commercial power grid | system CS by connecting the storage battery with remarkably bad characteristics, or the storage battery with unknown origin.

  Moreover, in the charging / discharging apparatus D, in addition to the authentication information acquisition part 143, the measurement part 14 may be provided and the characteristic value of the storage battery Bt may be measured. In this configuration, even when the storage battery Bt is system-separated by the authentication information, when the measurement unit 14 determines that the discharge is possible, the storage battery Bt is operated to supply power to the home load LS. Can do. On the other hand, even if the storage battery Bt has been confirmed to be the source by the authentication information, system disconnection can be performed if a battery with poor characteristics due to aging or individual problems is connected.

  Further, as in the third embodiment, when a power supply system (for example, a solar cell) different from the commercial power system CS is connected to the charging / discharging device D, the authentication information is not authenticated. Alternatively, charging may be performed using another power supply system.

  In the above-described embodiment, an ID number as shown in FIG. 12 is described as an example of authentication information. However, the present invention is not limited to this. For example, in addition to the ID number, the storage battery Bt is provided with a database that stores information including the number of times of charging, the date and time of charging, the history of transmission and charging capacity, etc., and is called and updated each time charging or discharging is performed. You may make it do. By holding such charging or discharging history as recognition information, by calling the recognition information, not only the origin of the storage battery Bt but also the history etc. can be searched simultaneously, so that the storage battery that adversely affects the commercial power system CS It is possible to more accurately recognize that Bt is connected.

  In addition, although each above-mentioned embodiment has demonstrated the charging / discharging apparatus which can perform both charge of the storage battery Bt, and discharge from the storage battery Bt, it is the discharge apparatus which performs only charge or the discharge apparatus which performs only discharge. By using the same configuration, it is possible to suppress adverse effects on the commercial power system CS.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

  The present invention is a charging / discharging device A for charging / discharging a storage battery Bt mounted on a vehicle EV, and is connected to a commercial power system CS, and charging / discharging means 1 for charging / discharging the storage battery Bt, and a commercial power system CS The switch 2 disposed between the charging / discharging means 1, the characteristic detection means 14 for detecting the characteristic of the storage battery Bt, and the opening / closing of the switch 2 based on the characteristic of the storage battery Bt detected by the characteristic detection means 14 And a control means 11 for driving the motor.

  According to this configuration, when the characteristics of the storage battery are poor, the commercial power system and the charging / discharging device are disconnected to suppress the adverse effect on the commercial power system due to the oscillation of the charging / discharging current during charging / discharging of the storage battery. Is possible.

  When the characteristic detection means 14 detects the electrical characteristics of the storage battery Bt, and the control means 11 determines that the electrical characteristics of the storage battery Bt do not satisfy a predetermined condition, the switch 2 is opened.

  By configuring in this way, the characteristics of the connected storage battery can be determined for each individual, so that the adverse effects on the commercial power system due to the connection of storage batteries whose characteristics have changed due to deterioration or individual differences can also be suppressed. Is possible.

  The characteristic detection means 143 can authenticate the storage battery Bt, and when the control means 11 cannot authenticate the storage battery Bt by the characteristic detection means 143, the switch 2 is opened.

  Since the switch is opened and closed by accreditation of the storage battery, it is possible to connect to the commercial power system only when a storage battery that is certified not to adversely affect the commercial power system is connected, and authentication is easy .

  The charging / discharging means 1c is connected to a charging system 4 that supplies power through a system different from the commercial power system CS, and charges the storage battery Bt with power from the charging system 4 when the switch 2 is open. .

  By comprising in this way, it is possible to charge a storage battery without having a bad influence on a commercial power system with respect to the storage battery which may have a bad influence on a commercial power system.

  The charging / discharging means 1 can supply the power of the storage battery Bt to the load LS connected to the commercial power system CS, and supplies the power from the storage battery Bt to the load LS when the switch 2 is open. .

  By comprising in this way, it can suppress that electric power is no longer supplied to load, and it can suppress that a failure, damage, etc. of the electric equipment contained in load generate | occur | produce by not supplying electric power.

  The charging / discharging means 1 can supply the power of the storage battery Bt to the load LS connected to the commercial power system CS, and when the switch 22 is opened, the power from the storage battery Bt is supplied to the load LS. The switch 22 is arranged so as not to be generated.

  According to this configuration, even when the storage battery is disconnected from the commercial power system, power is continuously supplied to the load from the commercial power system. As a result, even if the characteristics of the storage battery are poor, it is possible to suppress adverse effects on the commercial power system and to prevent power from being supplied to the electric equipment included in the load.

A Charging / discharging device EV Electric vehicle Bt Storage battery CS Commercial power system LS Domestic load 1 Charger / discharger 11 Control unit 12 Bidirectional AC / DC conversion unit 13 Bidirectional DC / DC conversion unit 14 Measurement unit 15 Switch drive unit 16 Display Part 17 Charging cable 18 Charging plug 2 Switch 3 Power distribution part

Claims (5)

A charging / discharging device for charging / discharging a storage battery mounted on a vehicle,
Charging / discharging means connected to a commercial power system for charging / discharging the storage battery;
A switch disposed between the commercial power system and the charge / discharge means;
Characteristic detecting means for detecting characteristics of the storage battery;
A charging / discharging device comprising: control means for driving opening and closing of the switch based on characteristics of the storage battery detected by the characteristic detection means. The characteristic detection means detects an electrical characteristic of the storage battery;
The charge / discharge device according to claim 1, wherein when the control unit determines that the electrical characteristics of the storage battery do not satisfy a predetermined condition, the charge / discharge device performs an operation of opening the switch. The characteristic detection means can authenticate the storage battery,
3. The charging / discharging device according to claim 1, wherein the control unit performs an operation of opening the switch when the storage battery cannot be authenticated by the characteristic detection unit. The charging / discharging means is connected to a charging system for supplying power in a system different from the commercial power system,
The charging / discharging device according to any one of claims 1 to 3, wherein the charging unit charges the storage battery with electric power from the charging system when the switch is open. The charging / discharging unit has a configuration capable of supplying the power of the storage battery to a load connected to the commercial power system,
The charging / discharging device according to any one of claims 1 to 4, wherein the charging / discharging unit supplies power from the storage battery to the load when the switch is open.

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