JP2024008701A - Inter-electric vehicle charging/discharging device - Google Patents

Abstract

To provide an inter-electric vehicle charging/discharging device which requires no distinction between a cable of a device and a vehicle (charging side and power supply side) during charging/discharging between electric vehicles.SOLUTION: An inter-electric vehicle charging/discharging device 301 according to the present invention comprises: an insulated bidirectional converter 10; a first connection circuit 11 that connects a first electric vehicle 21 with one end of the bidirectional converter 10; a second connection circuit 12 that connects a second electric vehicle 22 with the other end of the bidirectional converter 10; and a main control circuit 13 that compares pieces of information fetched from the vehicles (21 and 22), and makes the bidirectional converter 10, the first connection circuit 11 and the second connection circuit 12 operate so that a running battery of either one of the vehicles (22 or 21) is charged with DC power from a running battery of the other vehicle (21 or 22) on the basis of a result of comparison of the information.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a device that performs charging and discharging between electric vehicles.

BACKGROUND ART A device that performs charging and discharging between electric vehicles is known (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2014-165940 Patent No. 5552149

The charging device described in Patent Document 1 has a fixed power feeding side and a charging side, and if the power feeding side cable and the charging side cable are connected to a car by mistake, the vehicle that needs charging cannot be charged. . As described above, the charging device described in Patent Document 1 requires the work of identifying the cable of the device and the vehicle (charging side and power supply side) when charging and discharging between electric vehicles, and the charging work The problem was that it became complicated.

Therefore, in order to solve the above problem, the present invention provides an inter-electric vehicle charging/discharging device that does not require distinguishing between the cable of the device and the vehicle (charging side and power supply side) when charging and discharging between electric vehicles. The purpose is to

In order to achieve the above object, the electric vehicle inter-charging and discharging device according to the present invention includes a bidirectional converter.

Specifically, the electric vehicle charging/discharging device according to the present invention includes:
A first operation of converting the DC power at one end to arbitrary DC power and outputting it to the other end, or a second operation of converting the DC power at the other end to arbitrary DC power and outputting it to the one end. An isolated bidirectional converter that performs
a first connection circuit that connects a first vehicle equipped with a driving battery and the one end of the bidirectional converter;
a second connection circuit that connects a second vehicle equipped with a driving battery and the other end of the bidirectional converter;
Compare information retrieved from both vehicles, and charge the battery of the other vehicle with DC power from the battery of one of the vehicles based on the comparison result of the information. a main control circuit that operates the bidirectional converter, the first connection circuit, and the second connection circuit;
Equipped with.

Bidirectional converters can move DC power in either direction, from one side to the other and from the other side. Therefore, after connecting two electric vehicles to this inter-electric vehicle charging/discharging device, the charging side and the power feeding side can be set based on instructions from the main control circuit.

Therefore, the present invention can provide an inter-electric vehicle charging and discharging device that does not require distinguishing between the cable of the device and the vehicle (charging side and power feeding side) when charging and discharging between electric vehicles.

Note that the main control circuit may compare information retrieved from both of the vehicles, and determine the charging direction between the vehicles based on the comparison result of the information. The main control circuit acquires information such as the remaining charge of the driving battery from the two electric vehicles, determines that the charging direction is from the one with the highest remaining charge to the one with the lowest remaining charge, and drives the bidirectional converter. This electric vehicle charging/discharging device automatically distinguishes between the charging side vehicle and the power feeding side vehicle, and automatically sets the charging direction, so the operator needs to identify the charging side vehicle and the power feeding side vehicle. disappears.

The present invention can provide an inter-electric vehicle charging/discharging device that does not require distinguishing between the cable of the device and the vehicle (charging side and power supply side) during charging and discharging between electric vehicles.

FIG. 1 is a functional block diagram illustrating an electric vehicle inter-charging/discharging device according to the present invention. It is a flowchart explaining the operation of the electric vehicle charging/discharging device according to the present invention.

Embodiments of the invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. Note that components with the same reference numerals in this specification and the drawings indicate the same components.

FIG. 1 is a diagram illustrating an electric vehicle inter-charging/discharging device 301 of this embodiment. The inter-electric vehicle charging/discharging device 301 is a device that, when an electric vehicle cannot move due to a power shortage, temporarily charges the electric vehicle to the extent that it can be rushed to the nearest charging facility with another electric vehicle. Further, the inter-electric vehicle charging and discharging device 301 is a device that charges and discharges both electric vehicles when it is necessary to equalize the battery capacity between the electric vehicles.

The inter-electric vehicle charging/discharging device 301 is
A first operation of converting the DC power at one end to arbitrary DC power and outputting it to the other end, or a second operation of converting the DC power at the other end to arbitrary DC power and outputting it to the one end. an isolated bidirectional converter 10 that performs
a first connection circuit 11 that connects a first vehicle 21 equipped with a driving battery and the one end of the bidirectional converter 10;
a second connection circuit 12 that connects a second automobile 22 equipped with a driving battery and the other end of the bidirectional converter 10;
The information retrieved from both cars (21 and 22) is compared, and based on the comparison result of the information, the DC power from the driving battery of either car (21 or 22) is used to power the other car (22). or 21) a main control circuit 13 that operates the bidirectional converter 10, the first connection circuit 11, and the second connection circuit 12 so as to charge the driving battery;
Equipped with.

The inter-electric vehicle charging/discharging device 301 realizes charging/discharging between electric vehicles (21 and 22) safely and inexpensively. The reason is as follows.
The driving batteries of two electric vehicles (21 and 22) are connected via a bidirectional converter 10. The bidirectional converter 10 is, for example, a high frequency isolated DC/DC converter including a transformer, as disclosed in Patent Document 2. High frequency refers to the frequency of alternating current flowing through the transformer, and is approximately 20 kHz to 500 kHz. By using a high frequency type, the transformer can be made smaller and lighter, and the portability of the inter-electric vehicle charging/discharging device 301 can be improved.

Since the bidirectional converter 10 is of high frequency insulation type, it is possible to electrically disconnect between the electric vehicles (21 and 22), and when an abnormality occurs in the bidirectional converter 10 itself or in one of the vehicles, the electrical It is possible to avoid having an adverse effect on the other vehicle (in the case of an abnormality in the bidirectional converter 10 itself, on both vehicles). In other words, the vehicle can be protected and is safe.

The inter-electric vehicle charging/discharging device 301 also includes a main control circuit 13.
The main control circuit 13 constantly monitors the status of communication (for example, CHAdeMO protocol) with the electric vehicles (21 and 22). This communication means is not limited to CAN (Controller Area Network), RS232, wired, wireless, etc. By monitoring communication, the main control circuit 13 acquires information such as vehicle status (ground fault, temperature, voltage abnormality of running battery), vehicle connection status, vehicle connection circuit status, charging/discharging status, etc. can. Therefore, the main control circuit 13 can instantly detect an abnormality in the electric vehicle (21 and 22) (failure in the driving battery or charging/discharging control circuit), and can stop the electric vehicle (discharging or charging from the electric vehicle) after an abnormality occurs. (stopping).

Furthermore, the main control circuit 13 also monitors the state of the bidirectional converter 10. By monitoring the bidirectional converter 10, the main control circuit 13 can acquire, for example, the converter state and various internal states as information. Therefore, even when the bidirectional converter 10 is abnormal, the main control circuit 13 can similarly shorten the time from the occurrence of the abnormality to the stop (stopping discharging or charging from the electric vehicle). In other words, the vehicle can be protected and is safe.

The biggest feature of the electric vehicle inter-charging/discharging device 301 is that it is equipped with a bidirectional converter 10, which connects two electric vehicles (21, 22) without distinguishing between charging and discharging vehicles. The point is that you can. After connecting the two electric vehicles (21, 22) and the inter-electric vehicle charging/discharging device 301, the main control circuit 13 acquires remaining battery information of each vehicle through communication with the two vehicles, The direction of charging and discharging is determined by setting a vehicle with a small remaining battery level as a charging vehicle and a vehicle with a large remaining battery level as a discharging vehicle.

FIG. 2 is a flowchart illustrating the specific operation of the electric vehicle inter-charging/discharging device 301. First, the first connection circuit 11 and the electric vehicle 21, and the second connection circuit 12 and the electric vehicle 22 are connected (step S01). Next, the main control circuit 13 extracts vehicle information from each electric vehicle (21, 22) (step S02). The vehicle information includes, for example, the type (performance) of the driving battery, the remaining amount of power stored, the allowable output current, the storage battery capacity, and the lower limit voltage. Next, the main control circuit 13 checks compatibility/chargability based on the vehicle information (step S03). "Compatibility/Chargeability" refers to the charging direction (charging from electric vehicle 21 to electric vehicle 22 or vice versa), charging voltage, charging current, charging time, etc. based on the remaining amount and performance of the battery. The next step is to determine charging parameters.

The main control circuit 13 then instructs the main connection and charging operation (step S04). The main connection is to turn on the mechanical switch of the running battery system inside the electric vehicle (21, 22) and the mechanical switch inside the connection circuit (11, 12). The charging operation is an instruction to start the switching operation of the bidirectional converter 10. Specifically, based on the vehicle information obtained in step S02, the main control circuit 13 determines in step S03 that each electric vehicle is in a state where it can be charged and discharged, and that the voltage of the running battery of the electric vehicle on the discharging side is , confirms that the voltage range is within which the bidirectional converter 10 can operate, and if there is no problem, instructs the main connection and charging operation. For example, the main control circuit 13 determines charging parameters for an electric vehicle on the charging side with a small remaining battery level based on the vehicle information of the electric vehicle on the discharging side with a large remaining battery level and the device characteristics of the bidirectional converter 10 .

In this way, the electric vehicle charging/discharging device 301 can confirm that there are no abnormalities in each vehicle and that it is compatible by performing two steps: "pre-confirmation" and "main connection" before the actual connection. Ensure safety.

Main control circuit 13 continues to monitor each electric vehicle and bidirectional converter 10 during charging operations. For example, in the following case, the main control circuit 13 stops the charging operation (step S05).
(1) When the information from the vehicle to be charged includes that the amount of electricity stored in the driving battery exceeds a threshold, the main control circuit 13 controls the bidirectional converter 10 and the connection circuit. (11, 12) is stopped.
(2) If the information from the vehicle supplying DC power includes that the amount of electricity stored in the driving battery has fallen below a threshold, the main control circuit 13 controls the bidirectional converter 10 and Stop the connection circuits (11, 12).
(3) The main control circuit 13 knows the states of the bidirectional converter 10 and the connection circuits (11, 12), and if the vehicle information includes an abnormality or the state is abnormal, both directional converter 10 and connection circuits (11, 12) are stopped.

Note that the inter-electric vehicle charging/discharging device 301 may include an instruction input unit 14 through which the main control circuit 13 receives instructions from the outside. The drive batteries installed in electric vehicles vary in capacity and performance depending on the vehicle model. Therefore, as described above, the charging direction determined by the main control circuit 13 based on the acquired vehicle information may be opposite to the desired direction. In such a case, the operator inputs the correct charging direction into the instruction input section 14. When the main control circuit 13 receives an instruction from the instruction input unit 14 to charge the driving battery of the other vehicle with DC power from the driving battery of the desired vehicle, the main control circuit 13 outputs a comparison result of the information. Regardless, the bidirectional converter 10 and the connection circuits (11, 12) are operated according to the instructions.

As described above, the present invention can provide an inter-electric vehicle charging and discharging device 301 that does not require distinguishing between the cable of the device and the vehicle (charging side and power supply side) when charging and discharging between electric vehicles. .

10: Bidirectional converter 11: First connection circuit 12: Second connection circuit 13: Main control circuit 14: Instruction input section 21, 22: Electric vehicle 301: Electric vehicle inter-charging/discharging device

Claims (6)

A first operation of converting the DC power at one end to arbitrary DC power and outputting it to the other end, or a second operation of converting the DC power at the other end to arbitrary DC power and outputting it to the one end. An isolated bidirectional converter that performs
a first connection circuit that connects a first vehicle equipped with a driving battery and the one end of the bidirectional converter;
a second connection circuit that connects a second vehicle equipped with a driving battery and the other end of the bidirectional converter;
The bidirectional converter, the first connection circuit, and the second connection circuit are configured to charge the running battery of the other vehicle with DC power from the running battery of one of the vehicles. a main control circuit that operates the
An electric vehicle charging/discharging device comprising: When the information retrieved from the vehicle to be charged with DC power includes that the amount of electricity stored in the driving battery exceeds a threshold, the main control circuit controls the bidirectional converter, the first The inter-electric vehicle charging/discharging device according to claim 1, characterized in that the connection circuit and the second connection circuit are stopped. When the information retrieved from the vehicle supplying DC power includes that the amount of electricity stored in the driving battery is below a threshold, the main control circuit controls the bidirectional converter, the first The inter-electric vehicle charging/discharging device according to claim 1, characterized in that the connection circuit and the second connection circuit are stopped. The main control circuit grasps the information retrieved from both the vehicles as well as the states of the bidirectional converter, the first connection circuit, and the second connection circuit, and the information includes an abnormality. The electric vehicle intercharging system according to claim 1, further comprising: stopping the bidirectional converter, the first connection circuit, and the second connection circuit when the state is abnormal or when the state is abnormal. Discharge device. The main control circuit compares information retrieved from both the vehicles, determines a charging direction between the vehicles based on the comparison result of the information, and connects the bidirectional converter, the first connection circuit, and The inter-electric vehicle charging/discharging device according to claim 1, wherein the second connection circuit is operated. When the main control circuit is instructed from the outside to charge the running battery of the other vehicle with DC power from the running battery of the desired vehicle, regardless of the comparison result of the information. , operating the bidirectional converter, the first connection circuit, and the second connection circuit according to the instruction, the inter-electric vehicle charging/discharging device according to claim 5.

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