JP5495600B2 - Charge control device and vehicle - Google Patents

Description

  The present invention relates to a charge control device, a vehicle, and a charge control method.

  An electric vehicle equipped with a battery for driving a motor is described.

JP 05-207664 A

  There was a problem that the batteries mounted on the plurality of electric vehicles could not be efficiently charged from the power supply stand.

  In order to solve the above-described problem, according to a first aspect of the present invention, there is provided a charge control device for controlling charging of a battery mounted on a vehicle, wherein received power received from an external power source outside the vehicle is supplied to the battery. A first power supply path that supplies power; a second power supply path that supplies received power to the outside of the vehicle; and a power supply control unit that controls the amount of received power supplied to each of the first power supply path and the second power supply path. .

  The power supply control unit may increase the amount of received power supplied to the second power supply path as the difference between the predetermined power storage amount and the battery power storage amount is smaller. The power supply control unit may supply received power to the second power supply path when the storage amount of the battery has reached a predetermined value.

  The power supply control unit controls the switching of the power receiving destination by the first switch unit that switches the power receiving destination to either the first power feeding path or the second power feeding path, and the first switch unit. And a switching control unit. The first switching control unit may connect the supply destination of the received power to the second power supply path by the first switch unit when the storage amount of the battery has reached a predetermined value.

  The power supply control unit may further control the amount of power supplied from the battery through the second power supply path to the outside of the vehicle. The power supply control unit includes: a second switch unit that switches connection of the storage power supplied by the battery to the second power supply path; and a second switch control unit that controls connection of the storage power supply destination by the second switch unit. You may have.

  The second switching control unit may connect the supply destination of the stored power to the second power supply path by the second switch unit when power supply is requested from another vehicle. The second switching control unit may connect the supply destination of the stored power to the second power supply path by the second switch unit on condition that the storage amount of the battery exceeds a predetermined value.

  The battery may be a lithium ion battery.

  In the second aspect of the present invention, the vehicle includes the above-described charging control device and a motor driven by energy stored in the battery.

  A charging cable for supplying power from an external power source to the vehicle is further provided with an input connector that can be attached and detached from the outside, and the first power supply path supplies received power, which is power from the external power source received by the input connector, to the battery. The two power supply paths may supply the received power received by the input connector to the outside of the vehicle.

  You may further provide the output connector which can attach or detach from the exterior the charging cable which supplies the electric power supplied to the 2nd electric power feeding path to another vehicle.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

1 is a diagram illustrating an example of a power supply system 10. 3 is a diagram illustrating an example of an internal configuration of a power supply control unit 120. FIG. It is a figure which shows an example of the charge sequence to the some battery unit. It is a figure which shows an example of the time development of the charging current to the vehicle 100a. It is a figure which shows an example of the processing flow which supplies stored electric power to the other vehicle. 3 is a diagram illustrating an example of an internal configuration of a battery unit 110. FIG. It is a figure which shows an example of the connection state of the battery module. It is a figure which shows typically a mode that energy is transferred to the electrical storage apparatus 612. It is a figure which shows an example of the connection state in the case of charging a battery group in parallel. It is a figure which shows an example of the processing flow in the case of carrying out parallel charge of a some battery group.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 shows an example of a power supply system 10. The power supply system 10 in the present embodiment can function as a charging system that can efficiently charge a plurality of vehicles 100a-z. Vehicles 100a-z may be electric vehicles powered by electric energy. In the following description, the plurality of vehicles 100a-z may be collectively referred to as the vehicle 100.

  The power supply system 10 includes a power supply stand 180, a stand charging cable 182, and an inter-vehicle charging cable 184. The power supply stand 180 is an example of an external power source that is an external power source of the vehicle 100, and supplies the vehicle 100 with electric power consumed in the vehicle 100. Here, the consumption includes that electric power is used to operate an electric device mounted on the vehicle 100, and that electric power is stored in a battery unit mounted on the vehicle 100.

  A plurality of stand charging cables 182 are connected to the power supply stand 180. The charging cable for a stand 182 can electrically connect the power supply stand 180 and the vehicle 100 and supply power from the power supply stand 180 to the vehicle 100.

  The inter-vehicle charging cable 184 can electrically connect the vehicle 100 and the other vehicle 100 to supply electric power from the vehicle 100 to the other vehicle 100. As will be described later, the inter-vehicle charging cable 184 can supply the electric power supplied from the power supply stand 180 or the electric power supplied from the battery mounted on the vehicle 100 to the other vehicle 100.

  The stand charging cable 182 and the inter-vehicle charging cable 184 allow the power supply stand 180 and the plurality of vehicles 100 to be connected in a cascade manner. For this reason, for example, a plurality of vehicles 100 parked in a wide space such as a parking lot can be efficiently charged by the power supply stand 180 provided at one place.

  The vehicle 100a includes an input connector 151a, a power receiving path 123a, a first power feeding path 121a, an AC / DC converter 130a, a battery unit 110a, an output power path 124a, an orthogonal converter 132a, a second power feeding path 122a, an output connector 152a, a motor 140a, and The wheel 160a is provided. The input connector 151a can be connected to a charging cable 182 for a stand. The output connector 152 can connect the inter-vehicle charging cable 184.

  The vehicle 100b has components having the same functions as the vehicle 100a. Each component included in the vehicle 100b is referred to by a reference numeral in which the end of the reference numeral of the corresponding component in the vehicle 100a is replaced with b. For example, the vehicle 100b includes an input connector 151b, a power receiving path 123b, a first power feeding path 121b, an AC / DC converter 130b, a battery unit 110b, an output power path 124b, an orthogonal converter 132b, a second power feeding path 122b, an output connector 152b, and a motor 140b. And a wheel 160b. The inter-vehicle charging cable 184 can be connected to the input connector 151b and the output connector 152b.

  The vehicle 100z includes an input connector 151z, a first power feeding path 121z, an AC / DC converter 130z, a battery unit 110z, an output electric path 124z, an orthogonal converter 132z, and a motor 140z. Each component included in the vehicle 100c has the same function as the component of the same name included in the vehicle 100a.

  In the following description, components of the same name that both the vehicle 100a and the vehicle 100b have, or components of the same name that the vehicle 100a, the vehicle 100b, and the vehicle 100z have together are collectively referred to by omitting the suffix. For example, the power supply control unit 120a and the power supply control unit 120b are collectively referred to as the power supply control unit 120. The input connector 151a, the input connector 151b, and the input connector 151z are collectively referred to as the input connector 151.

  The input connector 151 is detachable from the outside with a stand charging cable 182 that supplies power from the power supply stand 180 to the vehicle 100 or an inter-vehicle charging cable 184 that supplies power from the battery unit 110 of another vehicle 100 to the vehicle 100. Is provided. Since the power supply stand 180 and the battery unit 110 of the other vehicle 100 function as an external power source when viewed from the specific vehicle 100, the battery unit 110 of the power supply stand 180 and the other vehicle 100 will be described below. May be collectively referred to as an external power source.

  The first power supply path 121 supplies the battery unit 110 with the received power that is the power from the external power source received by the input connector 151. The first power supply path 121 supplies the battery unit 110 with received power received from an external power supply outside the vehicle 100. Second power supply path 122 supplies received power to the outside of vehicle 100. For example, the second power supply path 122 supplies received power to the battery unit 110 mounted on another vehicle 100 via the output connector 152. As described above, the output connector 152 is detachably provided with a charging cable for supplying the power supplied to the second power feeding path 122 to the other vehicle 100 from the outside.

  The power supply control unit 120 controls the amount of received power supplied to each of the first power supply path 121 and the second power supply path 122. As will be described later, the power supply control unit 120 controls, as an example, which of the first power supply path 121 and the second power supply path 122 the power receiving power path 123 is connected to.

  Here, it is assumed that the electric power supplied to vehicle 100 through charging cable for stand 182 is alternating current. The first feed path 121 is provided with an AC / DC converter 130 for converting AC power into DC power. The DC power obtained by the AC / DC converter 130 is supplied to the battery unit 110 as charging power for charging the battery unit 110. The battery unit 110 is charged with charged power.

  The battery unit 110 can output the stored electric power as direct current power to the output electric circuit 124. An orthogonal transformer 132 is provided in the output electric circuit 124, and the DC power from the battery unit 110 is converted into AC power by the orthogonal converter 132. A motor 140 is electrically connected to the orthogonal transformer 132. The motor 140 is driven by the energy stored in the battery unit 110, and drives the wheels 160, for example. The motor 140 may be an AC motor. The motor 140 may be a direct current motor, and in this case, the motor 140 may be connected to the battery unit 110 without passing through the orthogonal transformer 132.

  The AC power obtained by the orthogonal transformer 132 can be supplied to the second power feeding path 122 under the control of the power feeding control unit 120. For example, when the electric power stored in the battery unit 110 is supplied to another vehicle 100, the power supply control unit 120 connects the output electric path 124 to the second power supply path 122. As described above, the power supply control unit 120 controls the amount of power supplied from the battery unit 110 to the outside of the vehicle 100 through the second power supply path 122. According to the vehicle 100 of the present embodiment, electric power can be received from the battery unit 110 of another vehicle 100 through the inter-vehicle charging cable 184.

  At least the battery unit 110a mounted on the vehicle 100a connected to the power supply stand 180 by the stand charging cable 182 may be a battery unit capable of rapid charging. The battery unit 110 mounted on the vehicle 100 to which power is supplied via the other vehicle 100 such as the vehicle 100b and the vehicle 100z may be a battery unit that cannot be rapidly charged. For example, the power supply stand 180 supplies power of a voltage of 400V to the vehicle 100a through the stand charging cable 182. The battery unit 110a can be rapidly charged using the power of 400V from the power supply stand 180. On the other hand, the battery unit 110b and the battery unit 110z can be charged using power of a voltage of 100V, but cannot be rapidly charged using power of a voltage of 400V.

  In this case, the power feeding control unit 120a converts the power received from the power feeding stand 180 into power having a voltage of 100V and supplies the power to the vehicle 100b. Specifically, the power supply control unit 120a may include a transformer that converts the voltage of the received power into a voltage suitable for charging the battery unit 110b. The power supply control unit 120a can supply the vehicle 100b with electric power having a voltage suitable for charging the battery unit 110b by connecting the output of the transformer to the second power supply path 122a.

  When the battery unit 110b is also a battery unit that can be rapidly charged, the power supply control unit 120a may supply, for example, power of voltage 400V to the vehicle 100b without transforming the received power from the power supply stand 180. . The power supply control unit 120a may determine whether or not the battery unit 110b is a battery unit that can be rapidly charged by acquiring information indicating an appropriate charging voltage of the battery unit 110b from the power supply control unit 120b. In addition, the output connector 152a has an output socket for quick charging and an output socket for non-rapid charging, each of which can connect an inter-vehicle charging cable 184, and the output socket for quick charging is connected between the vehicles. When the charging cable 184 is connected, it may be determined that the battery unit 110b is a battery unit that can be rapidly charged.

  Further, unlike the vehicles 100a and 100b, the vehicle 100z cannot supply power to other vehicles 100. The vehicle 100z is positioned at the end of the cascaded vehicle 100 row. However, if the vehicle 100z is parked at a position away from the power supply stand 180, the power supply system 10 can be effectively operated. .

  FIG. 2 shows an example of the internal configuration of the power supply control unit 120. The power supply control unit 120 includes a first switch unit 211, a second switch unit 212, a first switching control unit 221, a second switching control unit 222, and a charging information acquisition unit 230.

  The first switch unit 211 switches the supply destination of the received power to either the first power supply path 121 or the second power supply path 122. The first switching control unit 221 controls switching of the supply destination of received power by the first switch unit 211. When the power receiving path 123 and the first power feeding path 121 are connected by the first switch unit 211, the received power is supplied to the first power feeding path 121 and not supplied to the second power feeding path 122.

  The second switch unit 212 switches the connection to the second power supply path 122 to which the battery unit 110 supplies the stored power. The second switching control unit 222 controls connection of the storage power supply destination by the second switch unit 212. When the output power path 124 and the second power feeding path 122 are connected by the second switch unit 212, the stored power of the battery unit 110 is supplied to the second power feeding path 122. Note that, when the output power circuit 124 and the second power feeding path 122 are connected by the second switch unit 212, at least the power receiving power circuit 123 and the second power feeding path 122 are disconnected by the first switch unit 211.

  The charging information acquisition unit 230 acquires the storage amount of the battery unit 110 from the battery unit 110. The first switching control unit 221 connects the power receiving path 123 to the second power feeding path 122 when the amount of power stored in the battery unit 110 acquired by the charging information acquisition unit 230 has reached a predetermined value. In this way, the first switching control unit 221 connects the supply destination of the received power to the second power supply path 122 by the first switch unit 211.

  According to the power supply control unit 120, the received power can be supplied to the second power supply path 122 when the amount of power stored in the battery unit 110 reaches a predetermined value, so that the battery unit 110 of the specific vehicle 100 can be supplied. When the battery becomes fully charged, the other vehicles 100 can be charged sequentially. If the vehicles 100 are connected to each other, the charging of the battery units 110 of the vehicle 100 is sequentially completed, so that the management cost for managing the charging of the vehicle 100 can be reduced.

  The charging information acquisition unit 230 can acquire a request for power supply to the vehicle of the other vehicle 100 from the power supply control unit 120 of the other vehicle 100. The charging information acquisition unit 230 may acquire a power supply request through power line communication through the second power supply path 122. The charging information acquisition unit 230 may acquire a power supply request from the power supply control unit 120 of another vehicle 100 by wireless communication.

  The second switching control unit 222 causes the second switch unit 212 to connect the supply destination of the stored power to the second power supply path 122 when power supply is requested from another vehicle 100. At this time, the second switch control unit 222 sets the supply destination of the stored power to the second power supply path 122 by the second switch unit 212 on the condition that the stored amount of the battery unit 110 exceeds a predetermined value. May be connected. With this control, it is possible to prevent the power storage amount of the battery unit 110 from being reduced to an amount where the vehicle 100 cannot be operated by supplying power to another vehicle 100.

  FIG. 3 shows an example of a charging sequence for the plurality of battery units 110. The power supply control unit 120a uses the received power from the power supply stand 180 to start charging the battery unit 110a at time t0. When the power supply control unit 120a determines that the battery unit 110a is fully charged at time t1, the power supply control unit 120a controls the first switch unit 211a to connect the power reception path 123a to the second power supply path 122a. Thereby, after time t1, charging of the battery unit 110b mounted on the vehicle 100b is started.

  The power supply control unit 120b receives power from the power supply stand 180 via the second power supply path 122a and supplies the received power to the battery unit 110b. When the power supply control unit 120b determines that the battery unit 110b is fully charged at time t2, the power supply control unit 120b controls the first switch unit 211b to connect the power receiving path 123b to the second power supply path 122b. Thereby, after time t2, charging of the battery unit 110 of the vehicle 100 connected to the vehicle 100b by the inter-vehicle charging cable 184 is started.

  In this manner, the battery units 110 are sequentially charged with respect to the plurality of vehicles 100 that are cascade-connected with the inter-vehicle charging cable 184. According to the power supply system 10, the plurality of vehicles 100 manage their charging spontaneously without connecting the stand charging cable 182 to each vehicle, so that the plurality of vehicles 100 are sequentially charged without an administrator. can do. In addition, the power supply stand 180 simply needs to supply charging power through the stand charging cable 182 and does not need to control charging of the plurality of vehicles 100.

  Note that the order in which the plurality of vehicles 100 are charged may be determined voluntarily by the vehicle 100. For example, the charging information acquisition unit 230 of each of the plurality of vehicles 100 exchanges information indicating the storage amount of the battery unit 110, and the first switching control unit 221 of each vehicle 100 has a battery unit with a smaller storage amount. The first switch unit 211 may be controlled so that 110 is charged with higher priority. According to this control, it is possible to provide more users with the vehicle 100 in which the battery unit 110 is charged to some extent. This control is suitable when, for example, a large number of vehicles 100 in which a minimum amount of power storage is secured must be prepared.

  Conversely, the first switching control unit 221 of each vehicle 100 may control the first switch unit 211 so that the battery unit 110 with the charged amount closer to the full charge is charged with higher priority. According to this control, the vehicle 100 having the battery unit 110 that has reached full charge can be promptly provided to the user. This control is suitable when the vehicle 100 used for long-distance movement must be prepared quickly.

  FIG. 4 shows an example of the time evolution of the charging current for the vehicle 100a. With reference to this figure, the control which charges the some vehicle 100 in parallel is demonstrated.

  2 and 3, the control for switching the power receiving destination by the first switch unit 211 has been described. Here, the power receiving path 123 includes the first power feeding path 121 and the second power feeding path 122. It can be connected to any of these. The power supply control unit 120 can control the amount of received power supplied to the first power supply path 121 and the second power supply path 122. For example, the power supply control unit 120 can control the amount of power supplied by inverter control.

  It is assumed that the amount of current that can be supplied by the power supply stand 180 is Imax. As shown in the time evolution 410 of the charging current, the battery unit 110a mounted on the vehicle 100a is charged with a substantially constant current during a period when the amount of stored electricity is smaller than a predetermined value. When the storage amount reaches a predetermined value, the charging current amount is gradually reduced in order to prevent overcharging of the battery unit 110a.

  It is assumed that the difference current amount obtained by subtracting the charge current amount I400 required to charge the battery unit 110a from Imax at time t400 exceeds the minimum current amount to be supplied to the vehicle 100b. In this case, the power supply control unit 120a supplies a part of the received power to the second power supply path 122a at time t400 to supply the charging power for the battery unit 110b. Thereby, the vehicle 100a and the vehicle 100b can be charged in parallel.

  In this way, surplus power obtained by reducing the charging power to prevent overcharging can be supplied to another vehicle 100. Even if the purpose is not to prevent overcharge, the amount of power supplied to the battery unit 110 may be smaller as the amount of power stored in the battery unit 110 increases. Also in this case, surplus power sufficient to charge the battery unit 110 of another vehicle 100 can be obtained. Therefore, the power supply control unit 120 may increase the amount of received power supplied to the second power supply path 122 as the difference between the predetermined charged amount and the charged amount of the battery is smaller. More specifically, the power supply control unit 120 increases the amount of received power supplied to the second power supply path 122 as the difference between the full charge amount of the battery unit 110 and the charged amount of the battery unit 110 is smaller. Good. By such control, a plurality of vehicles 100 can be charged in parallel, so that a plurality of vehicles 100 can be charged quickly.

  FIG. 5 shows an example of a processing flow in the case where the stored power is supplied to another vehicle 100. Here, a case where the stored power of the battery unit 110a is supplied to the battery unit 110b will be described as an example.

  In step 502, the power feeding control unit 120a acquires a power feeding request from the vehicle 100b. At this time, the power supply control unit 120a may acquire a power supply request by receiving a power supply request signal from the power supply control unit 120b. In addition, the power supply control unit 120a determines whether or not the inter-vehicle charging cable 184 is connected to the output connector 152a, and determines that the inter-vehicle charging cable 184 is connected to the output connector 152a as a request for power supply. It can be considered.

  In step 504, the charging information acquisition unit 230 acquires the amount of power stored in the battery unit 110a. The charging information acquisition unit 230 may acquire the storage amount of the battery unit 110a by acquiring a voltage value (for example, a release voltage value) between the output terminals of the battery unit 110a.

  In step 506, it is determined whether or not the difference storage amount obtained by subtracting the minimum storage amount from the storage amount of the battery unit 110a is larger than the required power amount. Here, the required electric energy is the electric energy requested from the vehicle 100b, and can be exemplified by the electric energy required to charge the battery unit 110b. The charging information acquisition unit 230 may acquire the required power amount from the power supply control unit 120b.

  If the determination in step 506 is YES, in step 508, the power supply control unit 120 notifies the power supply control unit 120b that power can be supplied. The power supply control unit 120b starts charging control for the battery unit 110b on condition that the notification is received.

  In step 510, the output circuit 124 is connected to the second power supply path 122 a by the second switch unit 212, and the output of the battery unit 110 a is connected to the second power supply path 122. Then, when power is supplied from the battery unit 110a to the battery unit 110b in step 512 and an amount of electric power corresponding to the required electric power is supplied, the process ends.

  If the determination in step 506 is NO, in step 514, the power supply control unit 120 notifies the power supply control unit 120b that power supply cannot be performed, and the process ends. When the power supply control unit 120b receives the notification, the power supply control unit 120b does not start charging control for the battery unit 110b.

  Electric power can be exchanged between the vehicles 100 under the control of the power supply control unit 120 described above. Even when the amount of power stored in the battery unit 110 is insufficient and the vehicle 100 stops, the vehicle 100 moves to the power supply stand 180 by receiving from the other vehicle 100 the amount of power required to move to a nearby power supply stand. be able to.

  FIG. 6 shows an example of the internal configuration of the battery unit 110. The battery unit 110 includes a battery module assembly 610, a charge control unit 670, a division determination unit 660, a battery information acquisition unit 620, a discharge battery selection unit 630, a charge / discharge control unit 650, an output control unit 652, a power storage device 612, and an output terminal. 690.

  In relation to FIGS. 1 to 5, the vehicle 100 has the input connector 151, the power receiving path 123, the AC / DC converter 130, and the first power feeding path 121, but the input connector 151, A plurality of sets of the power receiving path 123, the AC / DC converter 130, and the first power feeding path 121 may be provided. In this configuration, a plurality of stand charging cables 182 can be simultaneously connected to the plurality of input connectors 151. And the electric power feeding control part 120 can control each set separately, and can charge the battery unit 110 using the received electric power received from the several input connector 151. FIG. The charge control in this configuration will be described with reference to FIGS.

  The battery module assembly 610 includes a plurality of battery modules 600. The battery module 600 has positive and negative terminals 602. In the following description, the left side is the positive terminal and the right side is the negative terminal in the drawing. Each of the battery modules 600 has a plurality of battery cells. Within the battery module 600, the plurality of battery cells may be connected in series. At least some of the plurality of battery cells may be connected in parallel. In the present embodiment, the battery unit 110 is an example of the battery pack according to the present invention. However, in other forms, the battery module assembly 610 or the battery module 600 can function as a battery pack. In the present embodiment, the battery cell is a lithium ion battery. The battery cell may be another type of secondary battery such as a nickel metal hydride battery.

  Output terminals at both ends of the plurality of battery modules 600 connected in series are electrically connected to the two output terminals 690 through the output electric circuit 604 as the output of the battery module assembly 610. Note that at least some of the plurality of battery modules 600 may be connected in parallel. For example, a plurality of battery module groups including a plurality of battery modules 600 connected in series may be connected in parallel, and the output of the parallel connection may be electrically connected to the output terminal 690. The two output terminals 690 are electrically connected to the output electric circuit 124.

  The functional block formed by the battery information acquisition unit 620, the discharge battery selection unit 630, the connection control unit 640, the charge / discharge control unit 650, the output control unit 652, and the power storage device 612 is added to the battery module 600 with a reduced power storage amount. It functions as a power storage control unit that can effectively use the stored power storage energy. In addition, the division determination unit 660 and the charge control unit 670 which are other components included in the battery module assembly 610 will be described with reference to FIGS. 9 and 10.

  Due to the function of the functional block functioning as the power storage control unit, the power storage energy stored in the battery module 600 whose power storage amount has decreased is collected in the power storage device 612. The energy collected in the power storage device 612 is used at a timing when a large current flows, for example, when the motor 140 is started.

  Specifically, the discharge battery selection unit 630 selects one or more battery modules 600 having a power storage amount smaller than a predetermined value from the plurality of battery modules 600 as discharge target batteries. The charge / discharge control unit 650 charges the power storage device 612 using energy stored in one or more discharge target batteries. The power storage device 612 preferably has an internal resistance smaller than that of the battery module 600. It is preferable that the charge / discharge control unit 650 charges the power storage device 612 having an internal resistance smaller than that of the one or more discharge target batteries, using energy stored in the one or more discharge target batteries.

  The charge / discharge control unit 650 receives the output from the discharge target battery via the discharge circuit 654. The power storage device 612 is stored using the power from the discharge target battery received via the discharge circuit 654. When the output voltage between the discharge circuit 654 is lower than a predetermined voltage value (for example, the charge voltage when the power storage device 612 is fully charged), the voltage input via the discharge circuit 654 is boosted. The power storage device 612 may be charged. For example, the charge / discharge control unit 650 can boost the voltage with a charge pump.

  The discharge battery selection unit 630 may select a plurality of discharge target batteries. Then, the charge / discharge control unit 650 may charge the power storage device 612 using energy stored in a plurality of discharge target batteries. When the discharge battery selection unit 630 selects a plurality of discharge target batteries, the connection control unit 640 connects the plurality of discharge target batteries in series. Then, the charge / discharge control unit 650 connects the plurality of discharge target batteries connected in series to the power storage device 612 to charge the power storage device 612. Although the voltage value between the outputs of the battery module 600 decreases as the storage amount decreases, the connection control unit 640 can increase the voltage of the discharge circuit 654 by connecting a plurality of discharge target batteries in series. For this reason, there is a case where power can be stored in the power storage device 612 without boosting.

  The battery information acquisition unit 620 acquires each internal resistance value of the plurality of battery modules 600 as a value indicating the amount of electricity stored in each of the plurality of battery modules 600. Then, the discharge battery selection unit 630 selects one or more battery modules 600 having an internal resistance value larger than a predetermined value from the plurality of battery modules 600 as a discharge target battery.

  The output control unit 652 supplies at least energy stored in the power storage device 612 to the power load when the power to be supplied from the plurality of batteries to the power load exceeds a predetermined value. Specifically, the output control unit 652 supplies the energy stored in the power storage device 612 to the power load by switching the connection switch 614 from open to closed. Specifically, the output control unit 652 supplies the energy stored in the power storage device 612 to the power load by closing the connection switch 614 and electrically connecting the connection circuit 616 to the output terminal 690.

  In addition, as an electric power load, the other electric equipment mounted in the vehicle 100 other than the motor 140 can be illustrated. For example, the output control unit 652 may supply at least energy stored in the power storage device 612 to the electric device so as to supply inrush power when the other electric device is powered on.

  As described above, the plurality of battery modules 600 are mounted on the vehicle 100 and supply the stored energy to the motor 140 mounted on the vehicle 100, but the output control unit 652 is configured to start the motor 140. At least energy stored in power storage device 612 may be supplied to motor 140. When the output control unit 652 detects load information such as a start signal for starting the motor 140 and a power-on signal for instructing power-on to other electric devices, the output control unit 652 converts the energy stored in the power storage device 612 into a power load. May be supplied.

  In the above description, the energy stored in the discharge target battery is used to charge the power storage device 612 provided separately from the battery module assembly 610. However, in other examples, the battery other than the discharge target battery is used. The battery module 600 may be charged using energy stored in the discharge target battery. Specifically, the discharge battery selection unit 630 may select one or more battery modules 600 having a smaller amount of stored electricity than other batteries among a plurality of batteries as a discharge target battery. The charge / discharge control unit 650 may charge another battery module 600 using energy stored in one or more discharge target batteries.

  FIG. 7 shows an example of the connection state of the battery module 600. In order to simplify the description, a case where the connection control unit 640 switches the connection of the six battery modules 600 will be described as an example. It is assumed that a plurality of battery modules 600 are connected in series when the storage amount of all the battery modules 600 is equal to or greater than a predetermined reference value.

  Here, the discharge battery selection unit 630 is configured such that the battery module 600-3, the battery module 600-5, and the battery module 600-5 in which the storage amount is smaller than a predetermined reference value based on the storage amount acquired by the battery information acquisition unit 620. Assume that the battery module 600-6 is selected as a discharge target battery. The connection control unit 640 disconnects the connection between the battery module 600-2 and the battery module 600-3, and electrically connects the positive terminal of the battery module 600-3 and the discharge electric circuit 654 with the bypass electric circuit 710. Connecting.

  The connection control unit 640 disconnects the connection between the battery module 600-3 and the battery module 600-4, and disconnects the connection between the battery module 600-4 and the battery module 600-5. The negative electrode terminal of the battery module 600-3 and the positive electrode terminal of the battery module 600-5 are electrically connected by a bypass electric circuit 711. Then, the negative electrode terminal of the battery module 600-6 is connected to the discharge electric circuit 654 by the bypass electric circuit 712. Thereby, battery module 600-3, battery module 600-5, and battery module 600-6 are connected in series, and outputs at both ends of the series connection are connected to discharge electric circuit 654. Then, the energy stored in battery module 600-3, battery module 600-5, and battery module 600-6 is transferred to power storage device 612 under the control of charge / discharge control unit 650.

  Further, the connection control unit 640 electrically connects the negative terminal of the battery module 600-2 and the positive terminal of the battery module 600-4 through the bypass electric circuit 700. The connection control unit 640 electrically connects the negative terminal of the battery module 600-4 to the output electric circuit 604 through the bypass electric circuit 701. With this connection control, both output terminals of the series connection of the battery module 600-1, the battery module 600-2, and the battery module 600-4 are electrically connected to the output electric circuit 604.

  FIG. 8 schematically shows how energy is transferred to the power storage device 612. A predetermined amount of the energy remaining in the battery module 600-3, the battery module 600-5, and the battery module 600-6 is transferred to the power storage device 612 as electric power, and is stored as, for example, electric charge in the power storage device 612. . Charging / discharging control unit 650 leaves the battery module 600-3, battery module 600-5, and battery module 600-6 with a predetermined amount of energy, and ends the discharge to power storage device 612. Thereby, it is possible to prevent the battery module 600 to be discharged from being completely discharged.

  FIG. 9 shows an example of a connection state when a plurality of battery groups formed by the battery module 600 are charged in parallel. In FIG. 10 and FIG. 10, functions and operations of the battery information acquisition unit 620, the connection control unit 640, the division determination unit 660, and the charge control unit 670 will be described. The functional blocks formed by the battery information acquisition unit 620, the connection control unit 640, the division determination unit 660, and the charge control unit 670 function as a charge control unit that charges a plurality of battery groups in parallel.

  Below, the function and operation | movement of each component which functions as the said charge control part are demonstrated. The connection control unit 640 switches the connection between the plurality of battery modules 600 according to the amount of received current that can be received from the external power source, and divides the connection into a plurality of battery groups. Specifically, the connection control unit 640 divides the plurality of battery modules 600 into a larger number of battery groups as the received current amount is larger. Charging control unit 670 charges a plurality of divided battery groups in parallel with the power received from the external power source. Specifically, the charging control unit 670 divides the power received from the external power supply by the number of battery groups, and charges the divided battery groups in parallel using the divided power. .

  Here, simply, the amount of received current can be based on the number of input connectors 151 to which the charging cable for stand 182 or the inter-vehicle charging cable 184 (collectively referred to as charging cable) is connected. For example, when charging is performed using a charging cable capable of supplying power of 100 V 15 A, the amount of received current naturally increases as more charging cables are connected.

  When the plurality of input connectors 151 are collectively referred to as a connector portion, a plurality of charging cables for supplying power from the external power source to the vehicle 100 are respectively attached to and detached from the connector portion. The connection control unit 640 divides the plurality of battery modules 600 into more battery groups when more charging cables are attached to the connector unit. Actually, the connection control unit 640 divides the plurality of battery modules 600 into the number of battery groups attached to the connector unit.

  Each charging cable is supplied with power from an independent external power source. Therefore, the connection control unit 640 divides the plurality of battery modules 600 into a larger number of battery groups when the number of power supplies that can receive power is larger. In practice, the connection control unit 640 divides the plurality of battery modules 600 into battery groups of the number of external power sources.

  The division determination unit 660 determines whether to divide the plurality of battery modules 600 into a plurality of battery groups. For example, the division determination unit 660 may determine to divide the plurality of battery modules 600 into a plurality of battery groups when a plurality of charging cables are connected to the connector unit. The division determination unit 660 may determine whether to divide a plurality of batteries into a plurality of battery groups based on the received current amount.

  The connection control unit 640 divides the plurality of batteries into a plurality of battery groups when the division determination unit 660 determines that the division should be performed. And charge control part 670 charges a plurality of divided battery groups in parallel with electric power received from an external power supply, when division judgment part 660 judges that it should divide.

  It is assumed that N input connectors 151 are provided. It is assumed that the received power from the charging cable connected to the input connector 151 is supplied through the received power paths 123-1 to 123 -N, respectively. The charging control unit 670 includes a plurality of chargers 672-1 to 672 -N. In the following description, the plurality of power receiving paths 123-1 to 123 -N are collectively referred to as a power receiving power path 123 or a plurality of power receiving power paths 123. The plurality of chargers 672-1 to 672 -N are collectively referred to as a charger 672 or a plurality of chargers 672. The plurality of chargers 672 are provided corresponding to the plurality of power receiving paths 123. Each of the plurality of chargers 672 receives the received power from the corresponding one power receiving path 123. Each of the plurality of chargers 672 charges the corresponding battery group using the received power received from the corresponding one power receiving path 123.

  Referring to FIG. 9, an example of a battery group divided by the connection control unit 640 is shown. In order to simplify the description, a case where the connection control unit 640 switches the connection of the six battery modules 600 will be described as an example. Assume that the description is divided into the same groups as in FIG. 7 so that the description is not redundant. That is, the battery module 600 includes the first battery group of the battery module 600-1, the battery module 600-2, and the battery module 600-4, the battery module 600-3, the battery module 600-5, and the battery module 600. It is assumed that the battery is divided into -6 second battery groups.

  The bypass circuit 900 is a bypass circuit similar to the bypass circuit 700, and the bypass circuit 911 is a bypass circuit similar to the bypass circuit 711. In the following description, connection destinations of the bypass electric circuit 901, the bypass electric circuit 910, and the bypass electric circuit 912 different from the bypass electric circuit described in FIG. 7 will be described.

  The positive terminal of the battery module 600-1 is connected not to the output electric circuit 604 but to the individual charging electric circuit 674-1. The negative terminal of the battery module 600-4 is electrically connected to the individual charging circuit 674 through the bypass circuit 901. The positive terminal of the battery module 600-3 is electrically connected to the individual charging circuit 674-2 by the bypass circuit 910. The negative terminal of the battery module 600-6 is connected to the individual charging circuit 674-2 by the bypass circuit 912.

  The first battery group is charged by the control of the charger 672-1 through the individual charging electric path 674-1. The second battery group is charged under the control of the charger 672-2 via the individual charging electric path 674-2. Compared to the case of receiving power with one charging cable, the number of battery modules 600 to be charged per charging cable can be reduced in the case of charging with two charging cables. For this reason, it may be possible to charge the battery module 600 in a shorter time than when receiving power with a single charging cable.

  For example, it is assumed that the battery module 600 cannot be quickly charged when the power of 100V15A can be received by one charging cable. When receiving power of 100V15A can be received by each of the receiving power path 123-1 and the receiving power path 123-2, each of the battery modules 600 is charged at a higher voltage than when receiving power with one charging cable. be able to. If the voltage can be increased to such an extent that it can be rapidly charged, each battery group can be rapidly charged, and the battery unit 110 can be charged extremely quickly.

  FIG. 10 shows an example of a processing flow when a plurality of battery groups are charged in parallel. In step 1002, the division determination unit 660 counts the number of input connectors 151 to which charging cables are connected. For example, the input connector 151 is provided with a switch that is opened / closed in accordance with whether or not the charging cable is connected, and the division determination unit 660 obtains an output corresponding to the opening / closing of the switch so that the charging cable is connected. The number of input connectors 151 connected may be counted.

  In step 1004, the battery information acquisition unit 620 acquires information indicating the degree of deterioration of each battery module 600. The degree of deterioration of each battery module 600 may be determined based on the measured value of the internal resistance of each battery module 600. The measured value of the internal resistance of each of the battery modules 600 can be used as the degree of deterioration of each of the battery modules 600.

  In addition, the battery module 600 is provided with a memory that stores the deterioration level information, and the battery information acquisition unit 620 acquires the deterioration level information stored in the memory, whereby each deterioration level of the battery module 600 is acquired. You may acquire the information which shows. The deterioration degree may be calculated based on a charge curve when the battery module 600 is charged or a discharge curve when the battery module 600 is discharged, and may be stored in the memory. Note that an average value (for example, an average value, an intermediate value, etc.) of the deterioration levels of the plurality of battery cells in the battery module 600 may be used as an index of the deterioration level of the battery module 600. In addition, the maximum deterioration degree among the respective deterioration degrees of the plurality of battery cells can be used as an index of the deterioration degree of the battery module 600.

  In step 1006, the connection control unit 640 divides the battery group into the number of connected charging cables based on the degree of deterioration of the battery module 600. Specifically, the connection control unit 640 may divide a battery having a closer deterioration level into the same battery group with higher priority. For example, when dividing the battery module 600 into two battery groups, the connection control unit 640 selects a predetermined number of battery modules 600 in descending order of deterioration and connects them in series. You may select and connect in series. In step 1008, each of the plurality of chargers 672 charges one corresponding battery group. By dividing into battery groups according to the degree of deterioration, appropriate charge control according to the degree of deterioration can be performed.

  In step 1006, the connection control unit 640 may divide into a plurality of battery groups based on the internal resistance value. For example, the connection control unit 640 may divide the battery module 600 having a closer internal resistance value into the same battery group with higher priority. The internal resistance value may be acquired by the battery information acquisition unit 620 in step 1004. By dividing the battery group according to the internal resistance value, appropriate charge control according to the magnitude of the internal resistance can be performed.

  In addition, the connection control unit 640 may be divided into a plurality of battery groups based on the storage amount. The connection control unit 640 may divide the battery module 600 having a closer storage amount into the same battery group with higher priority. The storage amount may be acquired by the battery information acquisition unit 620 in step 1004. Note that the connection control unit 640 may divide the battery module 600 into a plurality of battery groups in such a combination that the total amount of power stored in the battery group is substantially the same. Thereby, the charge required time of each battery group may be able to be averaged.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Electric power supply system, 100 Vehicle, 110 Battery unit, 120 Power supply control part, 123 Power receiving circuit, 124 Output electric circuit, 130 AC / DC converter, 132 Orthogonal converter, 140 Motor, 151 input connector, 152 output connector, 160 Wheel, 180 Power supply stand, 182 charging cable, 184 inter-vehicle charging cable, 121 first power supply path, 122 second power supply path, 211 first switch unit, 221 first switching control unit, 212 second switch unit, 222 second switching control unit , 230 charging information acquisition unit, 410 time development, 600 battery module, 602 terminal, 604 output electric circuit, 610 battery module assembly, 612 power storage device, 614 connection switch, 616 connection electric circuit, 620 battery information acquisition unit, 630 discharge battery selection Part, 640 connection control , 650 Charge control unit, 652 Output control unit, 654 Discharge circuit, 660 Division determination unit, 670 Charge control unit, 672 Charger, 674 Individual charging circuit, 690 Output terminal, 700 Bypass circuit, 701 Bypass circuit, 710 Bypass circuit , 711 Bypass circuit, 712 Bypass circuit, 900 Bypass circuit, 901 Bypass circuit, 910 Bypass circuit, 911 Bypass circuit, 912 Bypass circuit

Claims (12)

A charge control device for controlling charging of a battery mounted on a vehicle,
A first power supply path for supplying the battery with received power received from an external power source outside the vehicle;
A second power supply path for supplying the received power to the outside of the vehicle;
A power supply control unit that controls the amount of the received power supplied to each of the first power supply path and the second power supply path ;
The amount of charge current to the battery is reduced when the storage amount of the battery reaches a predetermined value,
The power feeding control unit is configured such that a differential current amount obtained by subtracting a charging current amount to the battery from a maximum current amount that can be supplied by the external power source is a minimum to be supplied to another vehicle connected to the second feeding path. When a current amount is exceeded, a part of the received power is supplied to the second power supply path, and the battery mounted on the other vehicle is charged while charging the battery. Charge control apparatus. The power supply control unit
A first switch unit that switches a supply destination of the received power to either the first feeding path or the second feeding path;
The charging control device according to claim 1, further comprising: a first switching control unit that controls switching of a supply destination of the received power by the first switch unit. The first switch control unit, when the charged amount of the battery has reached a predetermined value, according to claim 2 for connecting the supply destination of the received power by the first switch unit to the second feed line The charging control device according to 1.   The received power is supplied via a power receiving circuit,
  The first switch unit connects the power receiving path to either the first power feeding path or the second power feeding path,
  The first switch control unit is configured so that a battery with a storage amount close to full charge among the batteries mounted on a plurality of vehicles including the vehicle and the other vehicle is charged with higher priority. The power receiving path is connected to either the first feeding path or the second feeding path by controlling the power supply section
The charge control device according to claim 2. The charge control device according to any one of claims 1 to 4 , wherein the power supply control unit further controls a supply amount of electric power from the battery to the outside of the vehicle through the second power supply path. The power supply control unit
A second switch unit that switches connection to the second power supply path of the supply destination of the stored power by the battery;
The charge control device according to claim 5 , further comprising: a second switching control unit that controls connection of a supply destination of the stored power by the second switch unit. The second switch control unit, when requested power from the other vehicles, the charging control according the destination of the stored power by the second switch section to claim 6 which is connected to the second feed line apparatus. The second switching control unit connects the supply destination of the stored power to the second power supply path by the second switch unit on the condition that the storage amount of the battery exceeds a predetermined value. Item 8. The charge control device according to Item 6 or 7 .   The power supply control unit
  A first switch unit for connecting a power receiving path for receiving the received power to either the first power feeding path or the second power feeding path;
  A first switching control unit that controls the first switch unit to connect the power receiving path to either the first power feeding path or the second power feeding path;
  An orthogonal converter that is connected to an AC motor driven by AC power, converts DC power obtained from stored power by the battery into AC power, and outputs the AC power to the AC motor and an output circuit;
  A second switch section for switching the connection of the second power feeding path to the output electric circuit;
  A second switching control unit for connecting the second power feeding path to the output power path when charging the battery mounted on the other vehicle with the stored power of the battery mounted on the vehicle;
The charge control device according to claim 1, comprising: The charge control device according to any one of claims 1 to 8 ,
A vehicle comprising: a motor driven by energy stored in the battery. A charging cable for supplying power from an external power source to the vehicle;
The first power supply path supplies the battery with the received power, which is power from the external power source received by the input connector,
The vehicle according to claim 10 , wherein the second power supply path supplies the received power received by the input connector to the outside of the vehicle. The electric power supplied to the second feed path, the vehicle according to claim 10 or 11 further comprising a detachable output connector charging cable supplied to the other vehicle from the outside.

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