JP7411388B2 - Electric vehicle charging system, charging cable and electric vehicle power system - Google Patents

Description

The present invention relates to a charging system for an electric vehicle, a charging cable, and a power supply system for an electric vehicle.

Electric vehicles such as EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles) generally have a first battery that stores power for driving, and a second battery that outputs a voltage lower than the first battery (for example, 12V system). Equipped with. The second battery supplies power to various devices other than the travel motor, such as engine auxiliary equipment, various ECUs (Electronic Control Units), and relays. Some electric vehicles are equipped with an inlet to which a charging cable can be connected, and the first battery can be charged by introducing an external power source such as a commercial power source.

Since the electric vehicle uses the power of the second battery to start the system, depletion of the power of the second battery must be avoided. Generally, during system operation of an electric vehicle, the power of the first battery or the power generated by the generator based on the running energy is supplied to the power supply line, and the second battery is charged when the remaining charge is low.

Patent Document 1 discloses a charging system that has a function of avoiding depletion of the second battery while the vehicle is parked. This charging system periodically activates the vehicle system while the vehicle is parked, and the second battery is charged with the power from the first battery. Furthermore, when the first battery has a low charge remaining while the vehicle is parked, the second battery is charged only when the external power source is connected.

JP2014-212643A

Assume that the first battery is charged from an external power source using a charging cable. In this case, for example, after charging is completed or while waiting for timer charging, a situation may arise where the system of the electric vehicle is stopped and the charging cable is connected to the electric vehicle. Even when the system is stopped, some devices of the electric vehicle consume power from the second battery. Therefore, if the remaining charge of the second battery is low, there is a risk that the second battery will be exhausted even though the external power source is connected. When the second battery is depleted, not only the electric vehicle becomes unable to run, but also the charging cable may become unable to be unlocked depending on the electric vehicle. If it becomes impossible to release the lock, it becomes difficult to move the electric vehicle by towing, etc., and if the booster cable is not long enough, it becomes difficult to share electricity from other vehicles.

On the other hand, in the charging system of Patent Document 1, in order to avoid depletion of the second battery, the vehicle system is periodically activated while the external power source is connected, and power is sent from the external power source to the second battery. However, when the system starts up, the main relay is switched and the high voltage terminal of the first battery is connected to the system. Since the contacts of the main relay wear out due to opening and closing operations, it is desirable to switch the main relay less often.

The present invention provides a charging system for an electric vehicle, a charging cable, and a power supply system for an electric vehicle that can suppress depletion of a second battery when an external power source is connected without requiring activation of the system of the electric vehicle. The purpose is to provide

The invention according to claim 1 is
An on-vehicle charger that is mounted on an electric vehicle that has a first battery that stores electric power for running and a second battery that outputs a voltage lower than the first battery, and that charges the charging connector and the first battery. a power supply system having;
A charging cable connectable to the charging connector, comprising a cable through which charging power of the first battery is transmitted, and a control box located in the middle of the cable to switch between transmitting and stopping the charging power;
Equipped with
The control box includes a control unit that performs transmission control of the charging voltage of the second battery, and is capable of outputting the charging voltage via the cable,
The power supply system includes a transmission line that sends the charging voltage to the second battery from a terminal of the charging connector that is different from a terminal to which the charging power is input,
The charging system for an electric vehicle is characterized in that the control unit transmits the charging voltage when transmission of the charging power is stopped.

The invention according to claim 2 is mounted on an electric vehicle having a first battery that stores electric power for running and a second battery that outputs a voltage lower than the first battery, and a charging connector and the second battery that outputs a voltage lower than the first battery. a power supply system having an on-vehicle charger for charging one battery;
A charging cable connectable to the charging connector, comprising a cable through which charging power of the first battery is transmitted, and a control box located in the middle of the cable to switch between transmitting and stopping the charging power;
Equipped with
The control box is capable of outputting a charging voltage for the second battery via the cable,
The power supply system includes a transmission line that sends the charging voltage to the second battery from a terminal of the charging connector that is different from a terminal to which the charging power is input,
The cable includes a first signal line that transmits a communication signal between the control box and the on-board charger,
The control box outputs the charging voltage via the first signal line,
The power supply system includes:
a second signal line connecting the terminal of the first signal line and the on-vehicle charger;
The charging system for an electric vehicle is characterized in that the transmission line through which the charging voltage is sent is connected to the second signal line.

The invention according to claim 3 provides a charging cable connectable to an electric vehicle, which includes a first battery that stores power for running, a second battery that outputs a voltage lower than the first battery, and a charging connector. And,
a cable through which charging power of the first battery is transmitted;
a control box located in the middle of the cable and switching between transmitting and stopping the charging power;
Equipped with
The control box includes a control unit that performs transmission control of the charging voltage of the second battery, and is capable of outputting the charging voltage via the cable,
The charging cable is characterized in that the control unit transmits the charging voltage when transmission of the charging power is stopped.

The invention according to claim 4 is:
A power supply system for an electric vehicle mounted on an electric vehicle having a first battery that stores power for running and a second battery that outputs a voltage lower than the first battery,
a charging connector into which charging power of the first battery is input;
an on-vehicle charger that receives the charging power and communication signal from the charging connector to charge the first battery;
a signal line that transmits the communication signal to the in-vehicle charger from a terminal of the charging connector that is different from a terminal to which the charging power is input;
a transmission line that is connected to the signal line and sends a voltage for charging the second battery to the second battery side;
It is characterized by including.

According to the present invention, the charging voltage of the second battery is transmitted from the control box of the charging cable to the electric vehicle. Further, a charging voltage is sent to the second battery from a terminal different from the terminal to which the charging power of the first battery is input. Therefore, when the external power source is connected via the charging cable, the second battery can be charged without starting the system of the electric vehicle, and depletion of power in the second battery can be suppressed.

1 is a block diagram showing an electric vehicle and a charging cable according to an embodiment of the present invention. It is a flowchart which shows the procedure of the charging control process which the control part of a charging cable performs.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an electric vehicle and a charging cable according to an embodiment of the present invention.

<Electric vehicle>
The electric vehicle 1 of the present embodiment is an EV, a PHEV (Plug-in Hybrid Electric Vehicle), or the like, and includes drive wheels 2, a travel motor 3 that generates power for the drive wheels 2, and a drive motor 3 that stores power for travel. 1 battery 11, an inverter 4 that drives the travel motor 3, a second battery 16 that outputs a device power supply voltage (for example, 12V system) lower than the power supply voltage for travel outputted by the first battery 11, a DC/DC converter 7 that converts power supply voltage for equipment into a power supply voltage for equipment; a generator 8 that generates power supply voltage for equipment using a portion of driving power; and a vehicle that controls electric vehicle 1. It includes a control unit 9, electrical equipment 6 other than the travel motor 3, a power supply system 10 that supplies power voltage to each part, and, if an internal combustion engine is included, auxiliary equipment for the internal combustion engine. Vehicle control section 9 includes a plurality of ECUs (Electronic Control Units). The first battery 11 is, for example, a lithium ion storage battery, and may also be called a high voltage battery. The second battery 16 is, for example, a lead storage battery or a lithium ion storage battery, and may also be called an equipment battery or an auxiliary equipment battery.

The power supply system 10 includes a first power line L1 to which the voltage of the first battery 11 is output, and a second power line L2 to which the power supply voltage for equipment is output. The output terminals of the inverter 4, the first battery 11, the on-vehicle charger 13, and the input terminal of the DC/DC converter 7 are connected to the first power supply line L1. A second battery 16, a vehicle control unit 9, an electric device 6, an auxiliary machine (not shown), an output terminal of a DC/DC converter 7, and an output terminal of a generator 8 are connected to the second power supply line L2. In the vehicle control unit 9, the ECU may be connected to the second power supply line L2 via a voltage step-down circuit.

The power supply system 10 further includes a system main relay Rs that can open and close the first power line L1, an inlet 12 that can input external power, and an on-vehicle charger 13 that receives the external power and charges the first battery 11. It includes a transmission line L3 that sends the charging voltage of the second battery 16 inputted through the inlet 12 to the second battery 16 side.

System main relay Rs is driven to open and close by vehicle control unit 9 using power from second battery 16 . System main relay Rs is arranged between first battery 11 and inverter 4 and between first battery 11 and DC/DC converter 7, and is arranged between first battery 11 and inverter 4 and DC/DC converter 7. Connect or disconnect. Even if the system main relay Rs is opened or closed, the on-vehicle charger 13 and the first battery 11 are not disconnected.

The inlet 12 is a charging connector to which the connector portion 51 of the charging cable 50 can be connected, and is connected to the terminals of the power lines L11 and L12 through which charging power of the first battery 11 is transmitted, and the signal line L13 through which communication signals are transmitted. including terminals. The signal line L13 corresponds to an example of a first signal line according to the present invention.

The on-vehicle charger 13 is connected to power lines L11 and L12 of the inlet 12 and a signal line L13. The on-vehicle charger 13 receives external power from the inlet 12 via power lines L11 and L12, and outputs charging current to the first battery 11 via the first power line L1. The on-vehicle charger 13 communicates with the control box 60 of the charging cable 50 via the signal line L13, and charges the first battery 11 in cooperation with the operation of the control box 60.

The on-vehicle charger 13 includes a charging control unit that communicates with the control box 60 of the charging cable 50, a prohibition flag that prohibits charging the first battery 11, and a timer that measures the reserved charging time. Note that the timer is included in the vehicle control unit 9, and during reserved charging, the vehicle control unit 9 measures the reserved time, and when the reservation start time is reached, the timer is transmitted from the vehicle control unit 9 to the on-board charger 13. A configuration may also be adopted in which a command to start charging is sent.

The second battery 16 is provided with a battery management unit 16a that monitors voltage, temperature, charging/discharging current, and state of charge (SOC). Information on the charging rate of the second battery 16 is sent from the battery management unit 16a to the on-vehicle charger 13. Note that the information on the charging rate may be sent to the control box 60 of the charging cable 50 via another route without going through the on-vehicle charger 13.

The transmission line L3 connects the signal line L13 of the inlet 12 and the second power line L2, and can send the voltage for charging the second battery 16 from the signal line L13 to the second power line L2. The transmission line L3 is provided with a switch that can disconnect the second power supply line L2 and the signal line L13. As the switch, a diode D1 for preventing reverse current can be used. In this case, the diode D1 can automatically open and close the transmission line L3 according to the voltage of the signal line L13 and the voltage of the second power supply line L2.

<Charging cable>
A charging system for an electric vehicle 1 according to an embodiment of the present invention includes the power supply system 10 for the electric vehicle 1 described above and a charging cable 50 connectable to the electric vehicle 1. The charging cable 50 is located between a connector portion 51 connected to the inlet 12, cables 52a and 52b that transmit charging power for the first battery 11 from an external power source such as a commercial power source, and the cables 52a and 52b. and a control box 60 that switches between transmission and stop of the transmission. The connector portion 51 is also called a charging plug. The control box 60 is also called a CCID (Charge Circuit Interrupt Device). The charging cable 50 may be connected to an external power source via the power plug 53, or may be fixedly connected to the external power source.

The cable 52b between the control box 60 and the external power supply includes power lines L21 and L22 through which charging power (external power supply voltage) of the first battery 11 is transmitted. The cable 52a between the control box 60 and the connector section 51 includes power lines L21 and L22 through which charging power of the first battery 11 is transmitted, and a signal line L23 through which communication signals are transmitted. The signal line L23 corresponds to an example of a second signal line according to the present invention.

The control box 60 includes a switch Rc that opens and closes the power lines L21 and L22, an SW control section 62 that controls the opening and closing of the switch Rc, a communication section 63 that communicates with the on-vehicle charger 13, and a switch Rc that controls the charging voltage of the second battery 16. A control unit 64 that performs transmission control, a display unit 65 that displays operating status, etc., an AC/DC converter 66 that generates power supply voltage for each part in the control box 60 from an external power supply voltage, and a charger for charging the second battery 16. It includes a DC/DC converter 67 that generates a voltage (for example, 15V) and a switch SW1 that connects or disconnects the output terminal of the DC/DC converter 67 and the signal line L23. When the external power source is an AC power source, the DC/DC converter 67 may be configured to generate the charging voltage from the output of the AC/DC converter 66.

The SW control unit 62 has a charging prohibition flag that prohibits the transmission of charging power to the first battery 11, and when the charging prohibition flag is an invalid value and there is a power transmission request from the on-board charger 13, the SW control unit 62 turns off the switch Rc. Close to transmit charging power.

The communication unit 63 exchanges communication signals with the on-vehicle charger 13. The communication signals include a power transmission request sent from the on-board charger 13 to the control box 60, charging rate information of the second battery 16 sent from the on-board charger 13 to the control box 60, and from the control box 60 to the on-board charger 13. This includes a charging prohibition setting command, a charging prohibition setting cancellation command, etc. that are sent.

The control unit 64 executes a charge control process for the second battery 16, which will be described later, operates the DC/DC converter 67 according to conditions, and opens and closes the switch SW1.

<Charging process of the first battery>
To charge the first battery 11 using an external power source, the connector section 51 of the charging cable 50 is connected to the inlet 12, and the user operates the operation section (operation panel, etc.) of the electric vehicle 1 to charge the on-vehicle charger 13. The charging process is started by inputting a charging start command to. Alternatively, the user operates the operation unit to set a charging start time, and when that time is reached, a charging start command is input to the on-vehicle charger 13, thereby starting the charging process. At the start of the charging process, the on-vehicle charger 13 checks whether the charging prohibition flag in the on-vehicle charger 13 is an invalid value, and if it is an invalid value, transmits a power transmission request to the control box 60 of the charging cable 50. On the other hand, if the charging prohibition flag is a valid value, the on-vehicle charger 13 suspends operation until the charging prohibition flag switches to an invalid value, and when the charging prohibition flag switches to an invalid value, transmits a power transmission request to the control box 60 of the charging cable 50. do.

When the SW control unit 62 in the control box 60 receives a power transmission request via the communication unit 63, the SW control unit 62 checks whether the charging prohibition flag in the SW control unit 62 is an invalid value. , close switch Rc. Thereby, charging power is transmitted via power lines L21 and L22. On the other hand, if the charging prohibition flag is a valid value, the SW control unit 62 rejects the power transmission request from the on-vehicle charger 13. Then, the power transmission request and rejection response are repeated until the charging prohibition flag is switched to an invalid value.

When control is performed to close the switch Rc and charging power is transmitted, the on-vehicle charger 13 generates a charging current for the first battery 11 from the charging power and outputs it to the first battery 11. Then, the first battery 11 is charged. If charging continues and there is a trigger for charging completion, such as when the first battery 11 becomes fully charged or the charging end time is reached, the on-vehicle charger 13 stops outputting the charging current and sends a message to the control box 60 to stop power transmission. Send a request. When the SW control unit 62 receives a power transmission stop request via the communication unit 63, it opens the switch Rc to stop the transmission of charging power. Then, the charging process for the first battery 11 ends.

During the charging process, a communication signal is transmitted to the signal lines L23 and L13, but since the communication signal is lower than the voltage of the second power line L2, the signal line L13 and the second power line L2 are separated by the diode D1. Therefore, no current flows through the transmission line L3.

<Second battery charging control process>
FIG. 2 is a flowchart showing the procedure of charging control processing executed by the control unit of the charging cable. The control unit 64 of the control box 60 executes the charging control process shown in FIG. 2 while the connector unit 51 is connected to the inlet 12.

In the charging control process, the control unit 64 determines from the state of the SW control unit 62 and the charging rate information of the second battery 16 from the on-vehicle charger 13 that the transmission of the charging power of the first battery 11 is being stopped, and It is determined whether the charging rate of the second battery 16 is less than a threshold value (steps S1 and S2). The situation in which transmission of charging power of the first battery 11 is stopped includes after charging of the first battery 11 is completed, while waiting for timer charging of the first battery 11, and the like. The threshold value in step S2 is set to a value when the charging rate of the second battery 16 is low. As a result of the determination, if the transmission of the charging power of the first battery 11 is stopped and the charging rate of the second battery 16 is less than the threshold value, the control unit 64 transmits the charging voltage of the second battery 16. Proceed to the next step. On the other hand, if the charging power of the first battery 11 is being transmitted or if the charging rate of the second battery 16 is equal to or higher than the threshold value, the control unit 64 returns the process to step S1.

When the process proceeds to the next step, the control unit 64 performs a setting process on both the electric vehicle 1 and the control box 60 to prohibit charging of the first battery 11 (step S3). Specifically, the control unit 64 changes the charging prohibition flag of the SW control unit 62 to a valid value. If the charging prohibition flag is a valid value, the SW control unit 62 rejects the charging request from the on-vehicle charger 13 and does not close the switch Rc. Furthermore, the control unit 64 outputs a setting command to change the charging prohibition flag of the on-vehicle charger 13 to a valid value via the communication unit 63. When the charging prohibition flag is a valid value, the on-vehicle charger 13 does not transmit a charging request even when the set time for timer charging is reached, and waits until the charging prohibition flag changes to an invalid value.

Next, the control unit 64 drives the DC/DC converter 67 and turns on the switch SW1 to start transmitting the voltage for charging the second battery 16 (step S4). Thereby, the charging voltage is sent to the electric vehicle 1 via the signal line L23. Furthermore, the charging voltage is sent to the second power supply line L2 via the signal line L13, transmission line L3, and diode D1 of the electric vehicle 1, and the second battery 16 is charged. Note that a switch may be provided that disconnects the communication unit 63 from the signal line L23 during a period when the charging voltage is output to the signal line L23. Similarly, a switch may be provided that disconnects the on-vehicle charger 13 from the signal line L13 during a period when the charging voltage is output to the signal line L13.

The control unit 64 continues the charging state for a first time (step S5). During the charging control process, the system of the electric vehicle 1 is at rest and the power consumption of the second battery 16 is small, so the first time may be a short time, such as from several seconds to several minutes. After the first time has elapsed, the control unit 64 turns off the switch SW1 and stops driving the DC/DC converter 67, thereby ending the transmission of the voltage for charging the second battery 16 (step S6).

After the charging is finished, the control unit 64 performs a process of setting permission for charging the first battery 11 in both the electric vehicle 1 and the control box 60 (step S7). Specifically, the control unit 64 changes the charging prohibition flag of the SW control unit 62 to an invalid value. Further, the control unit 64 outputs a setting cancellation command to change the charging prohibition flag of the on-vehicle charger 13 to an invalid value via the communication unit 63. These charging permission settings enable charging processing of the first battery 11.

Next, the control unit 64 waits for the second time to elapse (step S8), and returns the process to step S1 after waiting. During the second time, the charging rate of the second battery 16 decreases due to the amount of power consumed from the second power supply line L2 during the system suspension of the electric vehicle 1 and the amount of power charged during the first time in step S5. It would be best to set it to a time when the event is not scheduled. Since the dark current is small while the system is inactive, the second time can be set to a relatively long time.

Then, after the second time period has elapsed, the control unit 64 returns the process to step S1 and repeats the process from step S1. Through such charging control processing, it is possible to prevent the second battery 16 from running out of power even though the external power source is connected while the system of the electric vehicle 1 is inactive, thereby preventing the electric vehicle 1 from falling into a state where it cannot run. .

As described above, according to the charging system of the electric vehicle 1, the charging cable 50, and the power supply system 10 of the electric vehicle 1 of the present embodiment, the charging voltage of the second battery 16 is transmitted from the control box 60 of the charging cable 50 to the cable 52b. It is transmitted to the electric vehicle 1 via. Note that the charging voltage of the second battery 16 may be lower than the voltage of the charging power of the first battery 11. Furthermore, in the power supply system 10 of the electric vehicle 1, the charging voltage is sent to the second battery 16 from a terminal different from the terminal to which the charging power of the first battery 11 is input. Therefore, when an external power source is connected via the charging cable 50, the second battery 16 can be charged without starting the system of the electric vehicle 1 (switching the system main relay Rs to the closed state). Depletion of the power of the second battery 16 can be suppressed.

Furthermore, according to the charging system for the electric vehicle 1, the charging cable 50, and the power supply system 10 for the electric vehicle 1 of the present embodiment, the control box 60 of the charging cable 50 includes the control unit 64 that controls charging of the second battery 16. included. Therefore, the second battery 16 of the electric vehicle 1 can be charged without increasing the power consumption of the second battery 16 of the electric vehicle 1 while the system of the electric vehicle 1 remains in a paused state.

Furthermore, according to the charging system for the electric vehicle 1, the charging cable 50, and the power supply system 10 for the electric vehicle 1 of the present embodiment, the control unit 64 of the control box 60 is not charging the first battery 11; When the charging rate of the second battery 16 is less than the threshold value, the voltage for charging the second battery 16 is output. By selecting a period during which the first battery 11 is not being charged, the charging voltage can be transmitted using the transmission line used when charging the first battery 11. In addition, by limiting the charging rate of the second battery 16 to less than the threshold value, it is possible to minimize the delay in charging the first battery 11 or the decrease in the amount of charge due to the charging of the second battery 16. can be suppressed to

Furthermore, according to the charging system for the electric vehicle 1, the charging cable 50, and the power supply system 10 for the electric vehicle 1 of this embodiment, the second A voltage for charging the battery 16 is transmitted. Furthermore, in the power supply system 10, a charging voltage transmission line L3 is connected between the signal line L13 and the second power supply line L2. Therefore, without increasing the number of terminals of the inlet 12 and the connector section 51, the second battery 16 using the external power source can be easily installed by simply adding the components in the control box 60 and the transmission line L3 of the power supply system 10. charging function can be realized.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. For example, in the above embodiment, the charging voltage of the second battery 16 is transmitted via the signal lines L23 and L13, but another transmission line is provided between the cable 52b and the inlet 12, and this transmission A configuration may also be adopted in which the charging voltage is transmitted via a line. This transmission line may be a transmission line dedicated to the voltage for charging the second battery 16. Further, in the above embodiment, a configuration is shown in which the charging voltage of the second battery 16 is transmitted during a period when the first battery 11 is not being charged, but the charging voltage is transmitted while the first battery 11 is being charged. You can. Further, the charging process for the first battery 11 may be temporarily interrupted, and the charging voltage for the second battery 16 may be transmitted during the interruption. Further, in the above embodiment, the charging voltage is transmitted when the charging rate of the second battery 16 is less than the threshold value, but the charging voltage is transmitted regardless of the charging rate of the second battery 16. It may also be a configuration. In this case, the configuration for sending the charging rate information of the second battery 16 to the control box 60 can be omitted. Further, in the embodiment described above, a configuration is shown in which the charging voltage of the second battery 16 is directly output to the second battery 16. However, the charging voltage may be a low voltage, such as 5V, for example, a booster circuit may be provided before the second battery 16, and the charging voltage may be sent to the second battery 16 via the booster circuit. In this case, the power supply voltage of the control unit 64 (output of the AC/DC converter 66) may be used as the voltage for charging the second battery 16, and in this case, the DC/DC converter 67 of the control box 60 can be omitted. Other details shown in the embodiments can be changed as appropriate without departing from the spirit of the invention.

1 Electric vehicle 2 Drive wheel 3 Travel motor 4 Inverter 6 Electrical equipment 7 DC/DC converter 8 Generator 9 Vehicle control section 10 Power supply system 11 First battery 12 Inlet (charging connector)
13 On-vehicle charger 16 Second battery 16a Battery management section D1 Diode Rs System main relay L1 First power line L2 Second power line L3 Transmission line L11, L12, L21, L22 Power line L13, L23 Signal line 50 Charging cable 51 Connector section 52a, 52b cable 60 control box Rc, SW1 switch 62 SW control section 63 communication section 64 control section 66 AC/DC converter 67 DC/DC converter

Claims (4)

An on-vehicle charger that is mounted on an electric vehicle that has a first battery that stores electric power for running and a second battery that outputs a voltage lower than the first battery, and that charges the charging connector and the first battery. a power supply system having;
A charging cable connectable to the charging connector, comprising a cable through which charging power of the first battery is transmitted, and a control box located in the middle of the cable to switch between transmitting and stopping the charging power;
Equipped with
The control box includes a control unit that performs transmission control of the charging voltage of the second battery, and is capable of outputting the charging voltage via the cable,
The power supply system includes a transmission line that sends the charging voltage to the second battery from a terminal of the charging connector that is different from a terminal to which the charging power is input,
A charging system for an electric vehicle, wherein the control unit transmits the charging voltage when transmission of the charging power is stopped. An on-vehicle charger that is mounted on an electric vehicle that has a first battery that stores electric power for running and a second battery that outputs a voltage lower than the first battery, and that charges the charging connector and the first battery. a power supply system having;
A charging cable connectable to the charging connector, comprising a cable through which charging power of the first battery is transmitted, and a control box located in the middle of the cable to switch between transmitting and stopping the charging power;
Equipped with
The control box is capable of outputting a charging voltage for the second battery via the cable,
The power supply system includes a transmission line that sends the charging voltage to the second battery from a terminal of the charging connector that is different from a terminal to which the charging power is input,
The cable includes a first signal line that transmits a communication signal between the control box and the on-board charger,
The control box outputs the charging voltage via the first signal line,
The power supply system includes:
a second signal line connecting the terminal of the first signal line and the on-vehicle charger;
A charging system for an electric vehicle, wherein the transmission line through which the charging voltage is sent is connected to the second signal line. A charging cable connectable to an electric vehicle, comprising a first battery that stores power for running, a second battery that outputs a voltage lower than the first battery, and a charging connector,
a cable through which charging power of the first battery is transmitted;
a control box located in the middle of the cable and switching between transmitting and stopping the charging power;
Equipped with
The control box includes a control unit that performs transmission control of the charging voltage of the second battery, and is capable of outputting the charging voltage via the cable,
The charging cable, wherein the control unit transmits the charging voltage when transmission of the charging power is stopped. A power supply system for an electric vehicle mounted on an electric vehicle having a first battery that stores power for running and a second battery that outputs a voltage lower than the first battery,
a charging connector into which charging power of the first battery is input;
an on-vehicle charger that receives the charging power and communication signal from the charging connector to charge the first battery;
a signal line that transmits the communication signal to the in-vehicle charger from a terminal of the charging connector that is different from a terminal to which the charging power is input;
a transmission line that is connected to the signal line and sends a voltage for charging the second battery to the second battery side;
A power supply system for an electric vehicle, comprising:

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