Charging and discharging device and charging and discharging system

Abstract

The application relates to the technical field of electric vehicle charging, in particular to a charging and discharging device and a charging and discharging system. The charging and discharging device comprises a charging gun, an alternating current power board, an inverter and a first charging and discharging controller. The two-in-one structure characteristics of the combination charging system of Europe and America are utilized, an alternating current charging interface is introduced on the basis of the existing CCS charging system, the alternating current loop and the direct current loop are integrated, the charging and discharging device can utilize the alternating current power board to supply power to the on-board charger of the electric vehicle to realize the alternating current charging function, the inverter is utilized to convert the direct current of the power battery of the electric vehicle into alternating current to realize the external discharging function, so that the cost of the two-way charging and discharging system between the vehicle and the pile is more optimal, and the inverter can support the mutual switching of the off-grid mode and the grid-connected mode.

Description

Technical Field

[0001] This application relates to the field of electric vehicle charging technology, specifically to a charging and discharging device and a charging and discharging system. Background Technology

[0002] With the rapid growth of electric vehicles in the future, and the continuous increase in the load on the power grid, the role of electric vehicles as mobile energy storage devices in providing auxiliary services or regulating the power grid is becoming increasingly apparent.

[0003] Currently, common bidirectional charging and discharging solutions include two approaches: one uses the DC circuit of a US standard combined charging system (CCS Com 1) or a European standard combined charging system (CCS Combo 2) for charging / discharging control, and the other uses the AC circuit of a US standard AC charging system (IEC AC Type 1) or a European standard AC charging system (IEC AC Type 2) and an on-board charger for charging / discharging control. The former uses an off-board bidirectional DC charger to charge or discharge the vehicle battery, supporting both V2H (off-grid mode) and V2G (grid-connected mode) scenarios. However, to accommodate charging functionality, the power system design is complex, resulting in larger equipment size and higher cost. The latter uses an AC charging pile in conjunction with an on-board bidirectional charger to charge or discharge the vehicle battery. The bidirectional on-board charger increases vehicle development costs and only meets V2H requirements, failing to support the grid communication requirements and grid connection conditions of V2G. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a charging and discharging device and a charging and discharging system to solve the technical problems that the on-board charger and AC charging pile in the existing bidirectional charging and discharging scheme cannot meet the grid connection technical requirements and the cost of off-board bidirectional DC charging piles is too high.

[0005] To achieve the above and other related objectives, this application provides a charging and discharging device comprising:

[0006] A charging gun is used to connect to the CCS charging socket of an electric vehicle. The interface of the charging gun includes an AC charging interface, a DC interface, and a communication interface.

[0007] An AC power board has a power connection terminal and an interface connection terminal. The power connection terminal is used to connect to an upstream AC power source, and the interface connection terminal is connected to the AC charging interface of the charging gun.

[0008] An inverter, wherein the AC side of the inverter is connected to the power supply connection terminal or the interface connection terminal, and the DC side of the inverter is connected to the DC interface of the charging gun;

[0009] A first charge-discharge controller is communicatively connected to the communication interfaces of the AC power board, the inverter, and the charging gun.

[0010] The first charge and discharge controller is used to control the AC power board to use the AC power from the upstream AC power supply to power the on-board charger of the electric vehicle, thereby charging the power battery.

[0011] The first charge / discharge controller is used to control the inverter to convert the DC power from the electric vehicle's power battery into AC power and discharge it in reverse to the upstream AC power source.

[0012] In an optional embodiment of this application, the charging and discharging device further includes a switching switch configured to switch between a first state and a second state according to a control signal from the first charging and discharging controller. The first state is that the AC side of the inverter is connected to the power supply connection terminal, and the second state is that the AC side of the inverter is connected to the interface connection terminal.

[0013] In an optional embodiment of this application, the charging and discharging device further includes a discharge switch, which is connected between the DC side of the inverter and the DC interface, and the control terminal of the first switch is communicatively connected to the first charging and discharging controller.

[0014] In an optional embodiment of this application, the first charge-discharge controller is further configured to control the AC power board to reverse discharge to the upstream AC power source using the AC power input from the AC charging interface;

[0015] The AC power input to the AC charging interface is obtained by converting the DC power from the electric vehicle's power battery into DC power through an on-board charger.

[0016] In one optional embodiment of this application, the AC power board includes a surge protection module, a residual current detection module, a power relay, and a current and voltage detection module connected in series.

[0017] The end of the surge protection module that is not connected to the residual current detection module serves as the power connection end, and the end of the current and voltage detection module that is not connected to the power relay is connected to the AC charging interface.

[0018] In an optional embodiment of this application, the AC power board further includes a temperature detection module, which is used to detect the temperature of the power relay and send the temperature detection result to the first charge-discharge controller.

[0019] In an optional embodiment of this application, the charging and discharging device further includes an auxiliary power supply, which is used to power the first charging and discharging controller.

[0020] In one optional embodiment of this application, the auxiliary power supply is powered by the upstream AC power supply.

[0021] In one optional embodiment of this application, the AC power board is a single-phase AC power board or a three-phase AC power board, and the inverter is a single-phase inverter or a three-phase inverter.

[0022] In one alternative embodiment of this application, the inverter includes an isolated inverter or a non-isolated inverter.

[0023] In one optional embodiment of this application, the CCS charging socket includes a US standard CCS Combo 1 charging socket or a European standard CCS Combo 2 charging socket.

[0024] In an optional embodiment of this application, the communication interface includes a control guidance interface, and the first charge / discharge controller is used to multiplex the control guidance interface to communicate with the electric vehicle during AC charging and DC discharging.

[0025] To achieve the above and other related objectives, this application also provides a charging and discharging system, comprising:

[0026] The aforementioned charging and discharging device;

[0027] Electric vehicles include power batteries, on-board chargers, battery management systems, and second charge / discharge controllers;

[0028] One end of the on-board charger is connected to the AC charging interface, and the other end is connected to the power battery and the DC interface respectively.

[0029] The battery management system is connected to the power battery and is used to monitor the status of the power battery;

[0030] The second charge / discharge controller is communicatively connected to the on-board charger, the communication interface, and the battery management system.

[0031] The charging and discharging device and system of this application utilize the combined AC / DC charging interface of the American and European standard composite charging system (CCS charging system). By introducing AC charging pins on the basis of the DC charging gun of the existing CCS charging system and integrating the AC charging circuit and the DC discharging circuit, the entire system can use the AC charging interface of the electric vehicle's CCS charging socket to power the on-board charger of the electric vehicle to achieve AC charging function, and use the DC charging interface of the CCS charging socket to invert the DC power of the electric vehicle's power battery into AC power to achieve external discharge function. This makes the bidirectional charging and discharging system between the vehicle and the charging pile more cost-effective, and the inverter can support switching between V2H (off-grid mode) and V2G (grid-connected mode).

[0032] The charging and discharging device and charging and discharging system of this application simplify the design of the entire power system because the inverter does not need to perform charging functions.

[0033] The charging and discharging device and charging and discharging system of this application can adopt a series or parallel topology for the AC charging circuit and the DC discharging circuit, which is more flexible and usable in technical applications.

[0034] The charging and discharging device and charging and discharging system of this application utilize the characteristics of the CP signal line in CCS vehicle-to-pile communication. The first charging and discharging controller is set to a control guide interface that can reuse the communication interface during AC charging and AC / DC discharging to realize the vehicle-to-pile communication function, which simplifies the design of the control system and further reduces hardware costs. Attached Figure Description

[0035] Figure 1 An electrical topology diagram of a charging system according to a specific embodiment of this application is shown.

[0036] Figure 2 It shows Figure 1 A schematic diagram of the charging and discharging process between the charging and discharging device and the electric vehicle in the charging system.

[0037] Figure 3 An electrical topology diagram of a charging system according to another specific embodiment of this application is shown.

[0038] Figure 4 An electrical topology diagram of the AC power board in the charging and discharging device of this application is shown.

[0039] Figure 5 An example of the electrical topology of the charging system of this application, which uses a power frequency isolated inverter for discharging, is shown.

[0040] Figure 6 An example of the electrical topology of the charging system of this application, which uses a high-frequency isolated inverter for discharging, is shown.

[0041] Figure 7 An example of the electrical topology of the charging system of this application, which uses a non-isolated inverter for discharging, is shown. Detailed Implementation

[0042] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.

[0043] To address the issues of existing bidirectional charging and discharging schemes where on-board chargers and AC charging piles cannot meet grid connection requirements, and the excessively high cost of off-board bidirectional DC charging piles, this application discloses a method such as... Figure 1 and 3 The diagram shows a charging and discharging device for AC charging piles, and a charging and discharging system incorporating such a device. Utilizing the combined AC / DC charging interface of the American and European Standard Combined Charging System (CCS), the system introduces AC charging interfaces for both live and neutral wires based on the existing DC charging gun of the CCS charging system. The AC charging circuit and DC discharging circuit are integrated, enabling the entire charging and discharging system to power the on-board charger of the electric vehicle using the AC charging interface of the CCS socket, and to convert the DC power from the vehicle battery into AC power using the DC charging interface of the CCS socket for external discharge. The inverter supports switching between V2H (off-grid mode) and V2G (grid-connected mode). Furthermore, since the inverter does not need to handle charging functions, the overall power system design is simplified.

[0044] The charging and discharging device 20 and the charging and discharging system of this application will be described in detail below with reference to the accompanying drawings.

[0045] Figure 1 An electrical topology diagram of a charging system according to a specific embodiment of this application is shown, including a charging and discharging device 20 located on the left side of the interface between the charging gun and the vehicle socket (vertical dotted line in the figure) and charging and discharging components disposed on the electric vehicle located on the right side of the interface between the charging gun and the vehicle socket. The charging and discharging device 20 may be, for example, a charging pile.

[0046] Please see Figure 1 The AC charging circuit and DC discharging circuit of the charging and discharging device 20 adopt a parallel topology. The charging and discharging device 20 includes a charging gun, an AC power board 21, an inverter 22, and a first charging and discharging controller 23. It should be noted that... Figure 1To meet the topology of the charging and discharging device 20 of the American standard CCS Combo 1, this topology can of course also be applied to the European standard CCS Combo 2.

[0047] like Figure 1 As shown, the charging gun's interface includes an AC charging interface, a DC interface, and a communication interface. The charging gun is a specially designed US standard CCS Combo 1 or European standard CCS Combo 2 charging gun. It is based on an existing US standard or European standard CCS Combo 1 / 2 DC charging gun, with the addition of live and neutral wire interfaces as AC charging interfaces. That is, the charging gun's interface includes not only the DC interface and communication interface of a conventional US standard or European standard CCS Combo 1 / 2 DC charging gun, but also an AC charging interface. The charging gun is compatible with the CCS charging socket of the electric vehicle 30. The charging and discharging device 20 can be connected to the CCS charging socket of the electric vehicle 30 through the charging gun to realize charging and discharging functions. Corresponding to the specially designed charging gun, the CCS charging socket can be a US standard CCS Combo 1 charging socket or a European standard CCS Combo 2 charging socket.

[0048] Taking the improved US standard CCS Combo 1 charging and discharging device 20 as an example, the AC charging interface includes an L1 interface and an L2 / N interface; the DC interface may include a DC+ interface and a DC- interface; and the communication interfaces are CS / CP interface and CP interface, wherein the CP interface serves as a control guidance interface. In the improved European standard CCS Combo 2 charging and discharging device 20, the AC charging interface includes an L1 interface, an L2 interface, an L3 interface, and an N interface; the DC interface includes a DC+ interface and a DC- interface; and the communication interfaces are CS interface and CP interface, wherein the CP interface serves as a control guidance interface.

[0049] The AC power board 21 has an AC charging function. The AC power board 21 is provided with a power connection terminal and an interface connection terminal. The power connection terminal is used to connect to the upper-level AC power supply 10, and the interface connection terminal is connected to the AC charging interface of the charging gun. The AC power board 21 is used to supply power to the on-board charger 31 using the upper-level AC power supply 10 according to the instructions of the first charge and discharge controller 23, thereby charging the on-board power battery 32 of the electric vehicle 30. The AC power board 21 is also used to discharge in reverse to the upper-level AC power supply 10 using the AC power input through the AC charging interface according to the instructions of the first charge and discharge controller 23. The AC power input through the AC charging interface is obtained by converting the DC power of the power battery 32 of the electric vehicle 30 through the on-board charger 31.

[0050] Please see Figure 4The AC power board 21 can adopt a circuit design similar to that of European standard AC charging piles (IEC AC Type 2) and American standard AC charging piles (IEC AC Type 1), including a surge protection module 221, a residual current detection module 222, a power relay 223, and a current and voltage detection module connected in series. The end of the surge protection module 221 that is not connected to the residual current detection module 222 serves as the power connection end, and the end of the current and voltage detection module that is not connected to the power relay 223 is connected to the AC charging interface. The current and voltage detection module includes a voltage detection module 225 and a current detection module 224 disposed between the voltage detection module 225 and the power relay.

[0051] It should be noted that the AC power board 21 also includes a temperature detection module (not shown). The temperature detection module is used to detect the temperature of the power relay 223 and send the temperature detection result to the first charge and discharge controller 23. The first charge and discharge controller 23 can understand the working status of the power relay 223 based on the temperature detection result and implement control when the power relay 223 is in an abnormal state.

[0052] like Figure 1 As shown, the AC side of the inverter 22 is connected to the power supply terminal of the AC power board 21, and the DC side of the inverter 22 is connected to the DC interface of the charging gun. The inverter 22 is used to reverse discharge the DC power from the power battery 32 of the electric vehicle 30 to the upstream AC power supply 10 according to the instructions of the first charge and discharge controller 23. This design integrates the AC charging circuit and the DC discharging circuit, making the bidirectional charging and discharging system between the vehicle and the charging station more cost-effective.

[0053] In the charging and discharging device 20, since the inverter 22 does not need to take on the charging function, the overall power supply design can be simplified. The inverter 22 can be a common type of inverter 22.

[0054] As an example, the inverter 22 may employ, for example, Figure 5 and Figure 6 The isolated inverter shown or such Figure 7 The non-isolated inverter shown is an example of an isolated inverter, where the isolated inverter can be as follows: Figure 5 The power frequency isolated inverter shown can also be as follows: Figure 6 The high-frequency isolated inverter shown can be a single-stage power supply design or a two-stage power supply design.

[0055] like Figure 1As shown, the first charge / discharge controller 23 is connected to the communication interfaces of the AC power board 21, the inverter 22 and the charging gun, respectively. The first charge / discharge controller 23 is used to communicate with the vehicle-mounted second charge / discharge controller 34 through the communication interface to control the AC power board 21 and the inverter 22 to realize the charge / discharge function. Specifically, the first charge / discharge controller 23 can be connected to the AC power board 21 and the inverter 22 via a CAN bus or other bus technologies or local communication technologies. The first charge / discharge controller 23 is connected to the communication interface via CP signal lines and CS / PP signal lines. The first charge / discharge controller 23 can be used to control the AC power board 21 to charge the power battery 32 of the electric vehicle 30 using the AC power from the upstream AC power supply 10. The first charge / discharge controller 23 is also used to control the inverter 22 to discharge in reverse to the upstream AC power supply 10 using the DC power from the power battery 32 of the electric vehicle 30. The first charge / discharge controller 23 is also used to control the AC power board 21 to discharge in reverse to the upstream AC power supply 10 using the AC power input from the AC charging interface, wherein the AC power input from the AC charging interface is obtained by converting the DC power from the power battery 32 of the electric vehicle 30 through the on-board charger 31.

[0056] like Figure 1 The first charge / discharge controller 23 can also utilize the characteristics of the CP signal line to reuse the CP interface in the communication interface to communicate with the electric vehicle 30 in AC charging and DC discharging, thereby simplifying the control system design and further reducing hardware costs.

[0057] like Figure 1 As shown, the AC power board 21 can be a single-phase AC design or a three-phase AC design, and the inverter 22 can be a single-phase AC design or a three-phase AC design. Depending on the upstream AC power supply 10, the AC power board 21 and inverter 22 can have up to four different combinations, as shown in Table 1.

[0058] Table 1

[0059]

[0060] like Figure 1 As shown, in this embodiment, the charging and discharging device 20 further includes a discharge switch K1. The discharge switch K1 is connected between the DC side of the inverter 22 and the DC interface. The control terminal of the discharge switch K1 is communicatively connected to the first charging and discharging controller 23 through a control signal line. The first charging and discharging controller 23 can control the connection state between the inverter 22 and the DC interface through the discharge switch K1.

[0061] like Figure 1As shown, in this embodiment, the charging and discharging device 20 further includes an auxiliary power supply 24. The auxiliary power supply 24 is used to supply power to the control system of the first charging and discharging controller 23, the AC power board 21 and the inverter 22. The input terminal of the auxiliary power supply 24 is connected to the power connection terminal of the AC power board 21, so that the auxiliary power supply 24 can be powered by the upstream AC power supply 10 during the charging process, and powered by the AC power output from the AC side of the inverter 22 or the AC power output from the power connection terminal of the AC power board 21 during the discharging process.

[0062] like Figure 1 As shown, in this embodiment, the electric vehicle 30 is an electric vehicle that supports AC charging and is equipped with a US standard CCS Combo 1 charging socket or a European standard CCS Combo 2 charging socket. The charging and discharging components of the electric vehicle 30 can adopt existing designs, mainly including a power battery 32, an on-board charger 31, a battery management system 33, and a second charge and discharge controller 34. One end of the on-board charger 31 is connected to the AC charging interface, and the other end is connected to the power battery 32 and the DC interface respectively. The battery management system 33 is connected to the power battery 32 and is used to monitor the status of the power battery 32. The second charge and discharge controller 34 is connected to the on-board charger 31, the communication interface, and the battery management system 33 via a CAN bus. The second charge and discharge controller 34, the on-board charger 31, the communication interface, and the first charge and discharge controller 23 control the charging and discharging process through information interaction.

[0063] like Figure 1 and 2 As shown, when charging the electric vehicle 30, the upstream AC power supply 10 charges the power battery 32 through the AC power board 21 and the on-board charger 31. When the electric vehicle 30 discharges, there are two optional modes: one is that the power battery 32 discharges in reverse to the upstream AC power supply 10 through the on-board charger 31 and the AC power board 21; the other is that the power battery 32 discharges in reverse to the upstream AC power supply 10 through the inverter 22. During the charging and discharging process, the first charge / discharge controller 23 communicates with the second charge / discharge controller 34 of the electric vehicle 30. During AC charging, charging control is performed by controlling the duty cycle of the PWM signal according to the technical requirements of Appendix A of IEC 61851-1. During reverse discharging, an Ethernet communication connection is established through the carrier communication method of the Home Plug Green PHY specification according to the technical requirements of ISO 15118-20 to conduct communication interaction and thus accurately control the discharge power.

[0064] It should be noted that the embodiments of this application also disclose another method, such as... Figure 3The diagram shows the electrical topology of the charging and discharging system. This system also includes a charging and discharging device 20 located to the left of the charging gun and vehicle socket interface (vertical dashed line in the diagram), and on-board charging and discharging components located to the right of the charging gun and vehicle socket interface. Figure 1 Compared to the charging and discharging system, the only difference is the connection method of the DC and AC circuits in the charging and discharging device 20. The other parts are the same, so they will not be described in detail.

[0065] like Figure 3 As shown, the AC charging circuit and DC discharging circuit of the charging and discharging device 20 adopt a series topology. The main components of the charging and discharging device 20 include a charging gun, an AC power board 21, an inverter 22, and a first charging and discharging controller 23.

[0066] like Figure 3 As shown, the charging gun includes an AC charging interface, a DC interface, and a communication interface, as described above.

[0067] like Figure 3 As shown, the AC power board 21 has a power connection terminal and an interface connection terminal. The power connection terminal is used to connect to the upper-level AC power supply 10 (e.g., the power grid), and the interface connection terminal is connected to the AC charging interface. The AC power board 21 is used to supply power to the on-board charger 31 using the upper-level AC power supply 10 according to the instructions of the first charge and discharge controller 23, thereby charging the on-board power battery 32 of the electric vehicle 30. The AC power board 21 is also used to discharge in reverse to the upper-level AC power supply 10 using the AC power input from the AC charging interface according to the instructions of the first charge and discharge controller 23. The AC power input from the AC charging interface is obtained by converting the DC power of the power battery 32 of the electric vehicle 30 through the on-board charger 31.

[0068] like Figure 3 As shown, the AC side of the inverter 22 is connected to the interface of the AC power board 21, and the DC side of the inverter 22 is connected to the DC interface, thus forming a series topology of AC charging circuit and DC discharging circuit. The inverter 22 is used to reverse discharge the DC power of the power battery 32 of the electric vehicle 30 to the upstream AC power supply 10 according to the instructions of the first charge and discharge controller 23. This design integrates the AC charging circuit and the DC discharging circuit, making the bidirectional charging and discharging system between the vehicle and the charging pile more cost-effective. Specifically, when the inverter 22 reverse discharges the DC power of the power battery 32 of the electric vehicle 30 to the upstream AC power supply 10, the inverter 22 first converts the DC power of the power battery 32 of the electric vehicle 30 input through the DC interface into AC power, and then discharges it to the upstream AC power supply 10 through the AC power board 21.

[0069] like Figure 3 As shown, in the charging and discharging device 20, since the inverter 22 does not need to perform charging functions, the overall power supply design is simplified. The inverter 22 can be a common type. For example, the inverter 22 can be such as... Figure 5 and Figure 6 The isolated inverter 22 shown or such Figure 7 The non-isolated inverter 22 shown can be, in contrast, an isolated inverter 22, which can be as follows: Figure 5 The power frequency isolated inverter 22 shown can also be as follows: Figure 6 The high-frequency isolated inverter 22 shown can be a single-stage power supply design or a two-stage power supply design.

[0070] like Figure 3 As shown, the first charge-discharge controller 23 serves as the central controller and is connected to the AC power board 21, the inverter 22, and the communication interface. The first charge-discharge controller 23 is used to communicate with the second charge-discharge controller 34 through the communication interface to control the AC power board 21 and the inverter 22 to achieve the charge-discharge function.

[0071] Specifically, the first charge / discharge controller 23 can be connected to the AC power board 21 and the inverter 22 via a CAN bus or other bus technologies. The first charge / discharge controller 23 is connected to the communication interface via CP signal lines and CS / PP signal lines. The first charge / discharge controller 23 can be used to control the AC power board 21 to charge the power battery 32 of the electric vehicle 30 using the AC power from the upstream AC power supply 10. The first charge / discharge controller 23 is also used to control the inverter 22 to discharge in reverse to the upstream AC power supply 10 using the DC power from the power battery 32 of the electric vehicle 30. The first charge / discharge controller 23 is also used to control the AC power board 21 to discharge in reverse to the upstream AC power supply 10 using the AC power input from the AC charging interface, wherein the AC power input from the AC charging interface is obtained by converting the DC power from the power battery 32 of the electric vehicle 30 through the on-board charger 31.

[0072] like Figure 3 As shown, the first charge and discharge controller 23 can also utilize the characteristics of the CP signal line to reuse the CP interface in the communication interface to communicate with the electric vehicle 30 in AC charging and DC discharging, thereby simplifying the control system design and further reducing hardware costs.

[0073] like Figure 3As shown, the AC power board 21 can be a single-phase AC design or a three-phase AC design, and the inverter 22 can be a single-phase AC design or a three-phase AC design. Depending on the upstream AC power supply 10, the AC power board 21 and inverter 22 can have up to four different combinations, as shown in Table 2.

[0074] Table 2

[0075]

[0076] like Figure 3 As shown, in this embodiment, the charging and discharging device 20 further includes a discharge switch K1. The discharge switch K1 is connected between the DC side of the inverter 22 and the DC interface. The control terminal of the discharge switch K1 is communicatively connected to the first charging and discharging controller 23 through a control signal line. The first charging and discharging controller 23 can control the connection state between the inverter 22 and the DC interface through the discharge switch K1.

[0077] like Figure 3 As shown, in this embodiment, the charging and discharging device 20 further includes an auxiliary power supply 24, which is used to supply power to the first charging and discharging controller 23. The input terminal of the auxiliary power supply 24 is connected to the power connection terminal of the AC power board 21, so that the auxiliary power supply 24 can be powered by the upstream AC power supply 10 during the charging process and by the AC power output from the power connection terminal of the AC power board 21 during the discharging process.

[0078] like Figure 3 As shown, when the electric vehicle 30 is being charged, the upstream AC power supply 10 charges the power battery 32 through the AC power board 21 and the on-board charger 31. When the vehicle is discharging, there are two optional modes: one is that the power battery 32 discharges in reverse to the upstream AC power supply 10 through the on-board charger 31 and the AC power board 21; the other is that the power battery 32 discharges in reverse to the upstream AC power supply 10 through the inverter 22 and the AC power board 21. During the charging and discharging process, the first charge / discharge controller 23 communicates with the second charge / discharge controller 34 of the electric vehicle 30. During AC charging, charging control is performed according to the technical requirements of Appendix A of IEC 61851-1, using PWM signal duty cycle control. During reverse discharging, an Ethernet communication connection is established according to the technical requirements of ISO 15118-20, using the carrier communication method of the Home Plug Green PHY specification, to perform communication interaction and thus accurately control the discharge power.

[0079] It should be noted that, Figure 3When the power battery 32 discharges in reverse to the upstream AC power supply 10 through the inverter 22 and AC power board 21, the charging and discharging device 20 shown can reuse the protection function in the AC power board 21, so there is no need to set up other discharge protection measures, which simplifies the structure of the charging and discharging device 20.

[0080] This embodiment also discloses a third charging and discharging device 20, which will... Figure 1 and Figure 3 The functions of the two charging and discharging devices 20 are integrated into one device via a switch, which can be switched according to the actual application. Figure 1 or Figure 3 The charging and discharging device 20 in the middle increases flexibility and availability.

[0081] Specifically, the AC side of the inverter 22 can be coupled to the power connection terminal and the interface connection terminal respectively through the switching switch. The switching switch is configured to switch between a first state and a second state according to the control signal of the first charge and discharge controller 23. The first state is that the AC side of the inverter 22 is connected to the power connection terminal, and the second state is that the AC side of the inverter 22 is connected to the interface connection terminal.

[0082] The switching switch can be a two-to-one switch or a multi-to-one switch. Alternatively, two separate switches can be used. One switch is set on the connection line between the AC side of the inverter 22 and the power supply connection terminal, and the other is set on the connection line between the AC side of the inverter 22 and the interface connection terminal. The two switches are used to control the on / off of the corresponding connection lines according to the control signal of the first charge / discharge controller 23.

[0083] As can be seen from the above, the charging and discharging device 20 and charging and discharging system of this application utilize the combined AC / DC charging interface structure of the American and European standard composite charging system (also known as a combined charging system, abbreviated as CCS). By introducing AC charging pins on the basis of the DC charging gun of the existing CCS charging system, the AC charging circuit and the DC discharging circuit are integrated. This allows the entire system to use the AC charging interface of the CCS charging socket of the electric vehicle 30 to power the on-board charger 31 of the electric vehicle 30 to achieve AC charging function, and use the DC charging interface of the CCS charging socket to invert the DC power of the power battery 32 of the electric vehicle 30 into AC power to achieve external discharge function. This makes the bidirectional charging and discharging system between the vehicle and the charging pile more cost-effective, and the inverter 22 can support V2H (off-grid mode) and V2G (grid-connected mode) switching. Since the inverter 22 of the charging and discharging device 20 and charging and discharging system of this application does not need to take on the charging function, the design of the entire power system can be simplified. The charging and discharging device 20 and charging and discharging system of this application can adopt a series or parallel topology for the AC charging circuit and the DC discharging circuit, which is more flexible and usable in technical applications. Utilizing the characteristics of the CP signal line used in CCS vehicle-to-pile communication, the first charging and discharging controller 23 is configured to use a CP interface that can reuse the communication interface during AC charging and AC / DC discharging to realize vehicle-to-pile communication function, thus simplifying the control system design and further reducing hardware costs.

[0084] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of this application. However, those skilled in the art will recognize that embodiments of this application may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc.

[0085] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0086] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0087] The above description of the embodiments shown in this application (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit this application to the precise forms disclosed herein. Although specific embodiments and examples of this application have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of this application, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to this application in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of this application.

[0088] This document has generally described the systems and methods in detail to aid in understanding the present application. Furthermore, various specific details have been provided to offer a general understanding of the embodiments of this application. However, those skilled in the art will recognize that embodiments of this application can be practiced without one or more specific details, or using other means, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring various aspects of the embodiments of this application.

[0089] Therefore, although this application has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of this application may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of this application. This application is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out this application, but this application will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of this application will be determined only by the appended claims.

Claims

1. A charging and discharging device, characterized in that, include: A charging gun is used to connect to the CCS charging socket of an electric vehicle. The interface of the charging gun includes an AC charging interface, a DC interface, and a communication interface. An AC power board has a power connection terminal and an interface connection terminal. The power connection terminal is used to connect to an upstream AC power source, and the interface connection terminal is connected to the AC charging interface of the charging gun. An inverter, wherein the AC side of the inverter is connected to the power supply connection terminal or the interface connection terminal, and the DC side of the inverter is connected to the DC interface of the charging gun; A first charge-discharge controller is communicatively connected to the communication interfaces of the AC power board, the inverter, and the charging gun. The first charge and discharge controller is used to control the AC power board to use the AC power from the upstream AC power supply to power the on-board charger of the electric vehicle, thereby charging the power battery. The first charge-discharge controller is used to control the inverter to convert the DC power from the electric vehicle's power battery into AC power and discharge it in reverse to the upstream AC power source. The communication interface includes a control guidance interface, and the first charge / discharge controller is used to reuse the control guidance interface to communicate with the electric vehicle during AC charging and DC discharging.

2. The charging and discharging device according to claim 1, characterized in that, The charging and discharging device further includes a switching switch configured to switch between a first state and a second state according to a control signal from the first charging and discharging controller. The first state is that the AC side of the inverter is connected to the power supply connection terminal, and the second state is that the AC side of the inverter is connected to the interface connection terminal.

3. The charging and discharging device according to claim 1, characterized in that, The charging and discharging device further includes a discharge switch, which is connected between the DC side of the inverter and the DC interface, and the control terminal of the discharge switch is communicatively connected to the first charging and discharging controller.

4. The charging and discharging device according to claim 1, characterized in that, The first charge-discharge controller is also used to control the AC power board to discharge in reverse to the upstream AC power source using the AC power input from the AC charging interface; The AC power input to the AC charging interface is obtained by converting the DC power from the electric vehicle's power battery into DC power through an on-board charger.

5. The charging and discharging device according to claim 1, characterized in that, The AC power board includes a surge protection module, a residual current detection module, a power relay, and a current and voltage detection module connected in series. The end of the surge protection module that is not connected to the residual current detection module serves as the power connection end, and the end of the current and voltage detection module that is not connected to the power relay is connected to the AC charging interface.

6. The charging and discharging device according to claim 5, characterized in that, The AC power board also includes a temperature detection module, which is used to detect the temperature of the power relay and send the temperature detection result to the first charge and discharge controller.

7. The charging and discharging device according to claim 1, characterized in that, The charging and discharging device also includes an auxiliary power supply, which is used to supply power to the control systems of the first charging and discharging controller, the AC power board, and the inverter.

8. The charging and discharging device according to claim 7, characterized in that, The input terminal of the auxiliary power supply is connected to the power connection terminal of the AC power board.

9. The charging and discharging device according to claim 1, characterized in that, The inverter includes isolated inverters or non-isolated inverters.

10. The charging and discharging device according to claim 1, characterized in that, The CCS charging socket includes the American standard CCS Combo 1 charging socket or the European standard CCS Combo 2 charging socket.

11. A charging and discharging system, comprising: The charging and discharging device as described in any one of claims 1-10; Electric vehicles include power batteries, on-board chargers, battery management systems, and second charge / discharge controllers; One end of the on-board charger is connected to the AC charging interface, and the other end is connected to the power battery and the DC interface respectively. The battery management system is connected to the power battery and is used to monitor the status of the power battery; The second charge / discharge controller is communicatively connected to the on-board charger, the communication interface, and the battery management system.

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