Charging / discharging device

Abstract

The utility model discloses a charging and discharging device, belongs to the technical field of charging and discharging, and comprises a charging and discharging connector, one end of which is connected with an energy storage module; the switch module is connected with the other end of the charging and discharging connector; one end of the first interface is connected with a power grid, and the other end of the first interface is connected with the switch module; and one end of the second interface is connected with the load, and the other end of the second interface is connected with the switch module. The charging and discharging device provided by the embodiment of the utility model is provided with the two output interfaces, and the two output interfaces can be switched according to the resistance value change of the resistance value adjusting module, so that the switching of V2G and V2L functions is realized.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of charging and discharging, and in particular to a charging and discharging device. BACKGROUND

[0002] With the increasing market size of electric vehicles, the application scenarios of charging piles are gradually increasing. Although the on-board chargers of many vehicle models on the market support V2G (Vehicle-to-Grid) and V2L (Vehicle-to-Lord), the on-board chargers are connected to the interfaces of the vehicles through separate charging gun lines or discharging gun lines when charging and discharging, and the output end of the on-board charger has only one output interface, which cannot realize the switching of the V2G and V2L interfaces. SUMMARY

[0003] Embodiments of the present application aim to provide a charging and discharging device to solve the technical problem that the output end of the on-board charger in the prior art has only one output interface, which cannot realize the switching of the V2G and V2L interfaces.

[0004] To solve the above technical problem, embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, a charging and discharging device is provided, comprising:

[0006] a charging and discharging connector, one end of the charging and discharging connector being connected to an energy storage module;

[0007] a switch module, the other end of the charging and discharging connector being connected to the switch module;

[0008] a first interface, one end of the first interface being connected to a power grid, and the other end of the first interface being connected to the switch module;

[0009] a second interface, one end of the second interface being connected to a load, and the other end of the second interface being connected to the switch module.

[0010] In combination with the first aspect, the switch module comprises a first switch module, the first switch module comprising a first switch and a second switch, the first switch being connected between the first interface and the charging and discharging connector, and the second switch being connected between the second interface and the charging and discharging connector.

[0011] In combination with the first aspect, the switch module further comprises a second switch module, and the charging and discharging connector further comprises a resistance adjustment module; the charging and discharging device further comprises:

[0012] A charge-discharge controller is connected to the first switcher and the second switcher respectively, and is further connected to the resistance adjusting module through the second switch module.

[0013] In combination with the first aspect, the charge-discharge joint includes a first terminal and a second terminal, and the resistance adjusting module is connected between the first terminal and the second terminal.

[0014] In combination with the first aspect, the resistance adjusting module includes a first resistor, and two ends of the first resistor are connected to the first terminal and the second terminal respectively.

[0015] In combination with the first aspect, the resistance adjusting module includes a first resistor and a second resistor, and two ends of the first resistor and the second resistor in parallel are connected to the first terminal and the second terminal respectively.

[0016] In combination with the first aspect, the second switch module has a first connection end and a second connection end, one end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is connected to the first connection end, and the other end of the second resistor is connected to the second connection end.

[0017] In combination with the first aspect, the charge-discharge controller has a first signal end and a second signal end, the first signal end is connected to the first switcher, and the second signal end is connected to the second switcher.

[0018] In combination with the first aspect, the charge-discharge controller has an output end, and the second switch module has a first receiving end, the first receiving end is connected to the output end.

[0019] In combination with the first aspect, the charge-discharge controller has a first enable end and a second enable end, the first enable end is connected to the first interface, and the second enable end is connected to the second interface.

[0020] The second aspect provides a charging pile including the charge-discharge device according to any one of the first aspect.

[0021] One of the above technical solutions has the following advantages or beneficial effects:

[0022] The embodiment of the present application provides a charging and discharging device, which comprises: a charging and discharging connector, one end of the charging and discharging connector being connected with an energy storage module; a switch module, the other end of the charging and discharging connector being connected with the switch module; a first interface, one end of the first interface being connected with a power grid, the other end of the first interface being connected with the switch module; and a second interface, one end of the second interface being connected with a load, the other end of the second interface being connected with the switch module. The charging and discharging device provided by the embodiment of the present application has two output interfaces, the two output interfaces can realize switching according to the resistance value change of the resistance value adjusting module, so that the switching of V2G and V2L functions is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] The technical scheme and other beneficial effects of the present application will be apparent from the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0024] Figure 1 A module connection schematic diagram of the charging and discharging device provided by the embodiment of the present application is shown in the figure.

[0025] Figure 2 A connection schematic diagram of the charging and discharging device provided by the embodiment of the present application and a vehicle is shown in the figure.

[0026] The reference signs are as follows:

[0027] 100-charging and discharging controller, 200-vehicle-mounted battery, 300-second switch module, 400-charging and discharging connector, 500-charging and discharging socket, 600-vehicle controller, 700-vehicle-mounted charger, 800-electricity meter. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] The specific embodiments of the present application are illustrated by the following examples:

[0030] As shown in Figure 1 and Figure 2 , the embodiment of the present application provides a charging and discharging device, comprising: a charging and discharging connector 400, one end of the charging and discharging connector 400 is connected to an energy storage module; a switch module, the other end of the charging and discharging connector is connected to the switch module; a first interface, one end of the first interface is connected to a power grid, and the other end of the first interface is connected to the switch module; a second interface, one end of the second interface is connected to a load, and the other end of the second interface is connected to the switch module. Specifically, the charging and discharging device is used to connect the electrical equipment equipped with the energy storage module, such as new energy vehicles, airplanes, ships, etc.

[0031] In some embodiments, the charging and discharging device can be a charging pile. The embodiment of the present application takes a new energy vehicle as an example, and the energy storage module therein is a vehicle-mounted battery 200. It is worth noting that the first interface is used to connect with the power grid, and the second interface is used to connect with the load, and both the first interface and the second interface can be in the form of a plug, a socket or a port. The charging and discharging connector 400 in the charging and discharging device is provided with a resistance adjusting module, and the flow direction of the current on the charging and discharging device can be controlled by adjusting the resistance of the resistance adjusting module. In the case that the resistance of the resistance adjusting module is a first resistance, the charging and discharging device is in a charging mode, and the power grid charges the vehicle-mounted battery 200 through the first interface and the charging and discharging connector 400; in the case that the resistance of the resistance adjusting module is a second resistance, the charging and discharging device is in a discharging mode, and the vehicle-mounted battery 200 supplies power to the load through the charging and discharging connector 400 and the first interface, that is, discharges the vehicle-mounted battery 200.

[0032] It can be understood that by adjusting the resistance of the resistance adjusting module, the mode of the charging and discharging device can be converted, so as to supply the power of the power grid to the vehicle-mounted battery 200 through the first interface, and the electrical equipment can be charged and store energy; in addition, the power of the vehicle-mounted battery 200 is supplied to the load through the second interface, so as to use the vehicle-mounted battery 200 as an emergency power supply to provide power for the load equipment.

[0033] As shown in Figure 2As shown in this embodiment, the switch module includes a first switch module, which includes a second switch KM2. The second switch KM2 is connected between the second interface and the charging / discharging connector 400. The second switch KM2 is configured to connect the second interface and the charging / discharging connector 400 when closed. Specifically, the second switch KM2 is used to control the connection state between the second interface and the charging / discharging connector 400. When the second switch KM2 is closed, the second interface is connected to the charging / discharging connector 400, and the charging / discharging connector 400 is connected to the load; when the second switch KM2 is open, the second interface is disconnected from the charging / discharging connector 400, and the charging / discharging connector 400 is disconnected from the load. It is conceivable that if the load requires power from the vehicle battery 200, the second switch KM2 can be controlled to be closed; and if the load does not require power from the vehicle battery 200, the second switch KM2 can be controlled to be open.

[0034] Understandably, by controlling the state of the second switch KM2 to control the discharge mode of the vehicle battery 200, the discharge process of the vehicle battery 200 can be controlled. In the event of a fault in the discharge circuit, the vehicle battery 200 can be disconnected from the load in a timely manner to avoid damage to the vehicle battery 200 or the load, thereby improving the safety of the vehicle battery 200.

[0035] like Figure 2 As shown in this embodiment, the first switch module includes a first switch KM1, which is connected between the first interface and the charging / discharging connector 400. The first switch KM1 is configured to connect the first interface and the charging / discharging connector 400 when closed. Specifically, the first switch KM1 controls the connection state between the first interface and the charging / discharging connector 400. When the first switch KM1 is closed, the first interface is connected to the charging / discharging connector 400, and the charging / discharging connector 400 is connected to the load; when the first switch KM1 is open, the first interface is disconnected from the charging / discharging connector 400, and the charging / discharging connector 400 is disconnected from the load. It is conceivable that if the vehicle battery 200 needs to be charged by the power grid, the first switch KM1 can be closed; if the vehicle battery 200 does not need to be charged by the power grid, the first switch KM1 can be opened. Alternatively, if the vehicle battery 200 needs to discharge to the power grid, the first switch KM1 can be closed; if the vehicle battery 200 does not need to discharge to the power grid, the first switch KM1 can be opened.

[0036] It can be understood that by controlling the state of the first switch KM1, whether the power grid charges the vehicle-mounted battery 200 or whether the vehicle-mounted battery 200 discharges the power grid can be controlled, the charging and discharging process between the power grid and the vehicle-mounted battery 200 is controlled, in the case of failure of the charging and discharging circuit, the vehicle-mounted battery 200 and the power grid can be cut off in time by controlling the first switch KM1, so as to avoid damage to the vehicle-mounted battery 200 or the power grid, and the safety of the vehicle-mounted battery 200 is improved.

[0037] As shown in Figure 1 and Figure 2 In the embodiment of the present application, the switch module further includes a second switch module 300, and the charging and discharging joint further includes a resistance adjusting module; the charging and discharging device further includes: a charging and discharging controller; the second switch module 300 is connected between the charging and discharging controller 100 and the resistance adjusting module, the charging and discharging controller 100 controls the closing and opening of the second switch module 300, in the case of opening of the second switch module 300, the resistance of the resistance adjusting module is the first resistance; in the case of closing of the second switch module 300, the resistance of the resistance adjusting module is the second resistance. Specifically, the second switch module 300 can be a transistor, a relay or a switched capacitor; the transistor is a commonly used switching device, which can realize the closing and opening of the switch by controlling the base voltage or current. Common types of transistors include field effect transistors and bipolar transistors. The relay is an electromagnetic switch, which can realize the closing and opening of the switch by controlling the on-off of its electromagnetic coil. The relay has high current and voltage carrying capacity, and is suitable for charging and discharging control requiring large power. The switched capacitor is a special capacitor, which can change its equivalent capacitance value by controlling the closing and opening of the switch. By adjusting the state of the switch, the resistance of the resistance adjusting module can be switched between the first resistance and the second resistance.

[0038] In the embodiment of the present application, the charging and discharging controller 100 can control the closing and opening of the second switch module 300 in the following ways: such as by outputting specific control signals to control the closing and opening of the second switch module 300. These control signals can be voltage, current or digital signals, which are matched according to the type and interface of the second switch module 300. The charging and discharging controller 100 can also use pulse width modulation (PWM, Pulse Width Modulation) technology to control the closing and opening of the second switch module 300. By adjusting the duty cycle of the PWM signal, the opening time and closing time of the second switch module 300 can be controlled, so as to realize the switching of the resistance of the resistance adjusting module between the first resistance and the second resistance.

[0039] It can be understood that by controlling the closing and opening of the second switch module 300, the charge and discharge controller 100 can realize accurate control of the resistance value of the resistance adjusting module to meet specific charge and discharge requirements. Thus, the flexibility and adjustability of the resistance adjusting module are improved, so that the resistance value of the resistance adjusting module can be dynamically adjusted as needed to adapt to different charge and discharge requirements of the vehicle-mounted battery 200.

[0040] As shown in Figure 2 In the embodiment of the present application, the charge and discharge connector 400 includes a first terminal PE1 and a second terminal CC1, the first terminal PE1 and the second terminal CC1 are connected to the vehicle controller 600, the vehicle controller 600 is connected to the vehicle-mounted battery 200, and the resistance adjusting module is connected between the first terminal PE1 and the second terminal CC1. The vehicle controller 600 is configured to switch the charge and discharge state of the vehicle-mounted battery 200 based on the resistance value of the resistance adjusting module. Specifically, the vehicle controller 600 is connected to the first terminal PE1 and the second terminal CC1, respectively, for identifying the resistance value of the resistance adjusting module; when the vehicle controller 600 identifies that the resistance value of the resistance adjusting module is a first resistance value, the vehicle controller 600 identifies the charge and discharge device as a charging device, the vehicle starts the charging mode, and the power grid supplies power to the vehicle-mounted battery 200 through the charge and discharge device; when the vehicle controller 600 identifies that the resistance value of the resistance adjusting module is a second resistance value, the vehicle controller 600 identifies the charge and discharge device as a discharging device, the vehicle starts the discharging mode, and the power grid discharges to the load or the power grid through the charge and discharge device.

[0041] It can be understood that by adjusting the resistance value of the resistance adjusting module, the vehicle controller 600 controls the vehicle-mounted battery 200 to charge or discharge after identifying the change in resistance value, thereby realizing control of different modes of the vehicle-mounted battery 200.

[0042] As shown in Figure 1 and Figure 2As shown in this embodiment, the charge / discharge controller 100 is connected to the resistance adjustment module, and the charge / discharge controller 100 is configured to control the resistance adjustment module to switch between a first resistance value and a second resistance value. Specifically, the charge / discharge controller 100 can control the charging and discharging of the battery through the voltage, current, resistance, power, and SOC in the battery circuit. The charge / discharge controller 100 may include a microcontroller, a digital signal processor, an analog-to-digital converter, a digital-to-analog converter, a power switch, and sensors, etc. The microcontroller can be used to control the charging and discharging process, execute algorithms and logic operations, and communicate with other components. The digital signal processor can be used to control and optimize the charging and discharging process in real time, and perform complex signal processing and algorithm calculations. The analog-to-digital converter can be used to read analog signals such as battery voltage, current, and temperature to monitor and control the battery state. The digital-to-analog converter can be used to generate control signals to adjust the resistance value of the resistance adjustment module, thereby controlling the charging and discharging rate. The power switch is used to control the connection and disconnection of the charging and discharging circuit, and can open or close the circuit according to the control signal to realize the control and switching of charging and discharging. The sensor is used to monitor the battery's state parameters, such as voltage, resistance, current, and temperature.

[0043] Understandably, by setting the charge / discharge controller 100, the resistance value of the resistance adjustment module can be dynamically adjusted according to actual needs and application scenarios, thereby enabling the vehicle battery 200 to serve as an emergency power source to provide power to the load equipment. This balances the energy interaction between the vehicle battery 200 and the power grid, improves the energy management optimization of the vehicle battery 200, and enhances the flexibility of the vehicle battery 200 in use.

[0044] like Figure 2 As shown in the embodiment of this application, the resistance adjustment module includes a first resistor R1 and a second resistor R2. The second switch module 300 has a first connection terminal and a second connection terminal. One end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the first resistor R1 is connected to the first connection terminal, and the other end of the second resistor R2 is connected to the second connection terminal.

[0045] The resistance adjusting module includes two working conditions: in the case that the second switch module 300 is closed, the first connection end and the second connection end are conducted, and the first resistor R1 and the second resistor R2 are connected in parallel; in the case that the second switch module 300 is disconnected, the first connection end and the second connection end are disconnected, and the first resistor R1 and the second resistor R2 are disconnected. Specifically, the second switch module 300 includes a field effect transistor or a triode, wherein the first receiving end of the second switch module 300 is the gate of the field effect transistor or the base of the triode, the first connection end is the source of the field effect transistor or the emitter of the triode, and the second connection end is the drain of the field effect transistor or the collector of the triode. Taking an N-type triode as an example, in the case that the base of the N-type triode receives a high-level control signal, the collector and the emitter of the N-type triode are conducted, the first resistor R1 and the second resistor R2 form a parallel connection, and the resistance of the resistance adjusting module is the resistance after the first resistor R1 and the second resistor R2 are connected in parallel; and in the case that the base of the N-type triode receives a low-level control signal, the collector and the emitter of the N-type triode are disconnected, the second resistor R2 is disconnected from the first resistor R1, and the resistance of the resistance adjusting module is the resistance of the first resistor R1.

[0046] It can be understood that by controlling the second switch module 300 to be closed or disconnected through the charge-discharge controller 100, the parallel or disconnected relationship between the second resistor R2 and the first resistor R1 is controlled, so that the resistance output by the first resistor R1 and the second resistor R2 is controlled, and the purpose of controlling the vehicle-mounted battery 200 to switch between the charging mode and the discharging mode is achieved.

[0047] As shown in FIG. 1, Figure 2 In the embodiment of the present application, the charge-discharge controller 100 has a first signal end KM3 and a second signal end KM4, the first signal end KM3 is connected with the first switch KM1 and is configured to control the first switch KM1 to be closed or disconnected, and the second signal end KM4 is connected with the second switch KM2 and is configured to control the second switch KM2 to be closed or disconnected. Specifically, the first switch KM1 and the second switch KM2 can be any one of a relay, a transistor, a switch tube, an optical coupler, and a field effect tube. The charge-discharge controller 100 sends a switch control signal through the first signal end KM3 to control the first switch KM1 to be closed or disconnected, and sends a switch control signal through the second signal end KM4 to control the second switch KM2 to be closed or disconnected.

[0048] It can be understood that by setting the first switch KM1 and the second switch KM2 on the charge-discharge controller 100 to control the connection state of the first interface and the second interface with the charge-discharge joint 400, the charging mode and the discharging mode of the vehicle-mounted battery 200 are switched.

[0049] As Figure 2 shown in the embodiment of the present application, the charge-discharge controller 100 has an output terminal DO, the second switch module 300 has a first receiving terminal, the first receiving terminal is connected with the output terminal DO, in the case that the output terminal DO outputs a first level to the first receiving terminal, the second switch module 300 is closed; in the case that the output terminal DO outputs a second level to the first receiving terminal, the second switch module 300 is disconnected; wherein the first level is higher than the second level. Specifically, the charge-discharge controller 100 outputs a control signal to the first receiving terminal through the output terminal DO, the control signal has the first level or the second level, and the closing and disconnecting of the second switch module 300 are realized by controlling the high and low levels of the control signal. Therefore, the second switch module 300 used in the embodiment of the present application can be a field effect transistor, which is turned on in the case that the first level is a high level, and is closed in the case that the second level is a low level.

[0050] It can be understood that the closing and disconnecting of the second switch module 300 are controlled by the charge-discharge controller 100 outputting control signals of different levels, so that the second switch module 300 can respond quickly, the accurate control of the state of the second switch module 300 is realized, and the reliability and stability of the second switch module 300 are improved.

[0051] As Figure 2 shown in the embodiment of the present application, the charge-discharge controller 100 has a first enable terminal PWR1 and a second enable terminal PWR2, the first enable terminal is connected with the first interface, the first enable terminal PWR1 is configured to obtain a working voltage from the connected first interface, the second enable terminal PWR2 is connected with the second interface, and the second enable terminal PWR2 is configured to obtain a working voltage from the connected charge-discharge joint 400. Specifically, the charge-discharge controller 100 not only needs to output a control signal to control the disconnecting and closing of the second switch module 300, but also needs to output a conversion signal according to the mode of the vehicle-mounted battery 200 to convert the connection relationship between the first interface, the second interface and the charge-discharge joint 400. Therefore, before the charge-discharge device works, the charge-discharge controller 100 needs to be powered on first to be able to output the control signal and the conversion signal. In the charging mode, the power grid charges the vehicle-mounted battery 200 through the first interface and the charge-discharge joint 400, therefore, the charge-discharge controller 100 can obtain a working voltage from the power grid connected with the first interface through the first enable terminal PWR1, so as to realize the disconnecting of the second switch module 300; in the discharging mode, the vehicle-mounted battery 200 supplies power to the load through the charge-discharge joint 400 and the first interface, therefore, the charge-discharge controller 100 can obtain a working voltage from the vehicle-mounted battery 200 connected with the charge-discharge joint 400 through the second enable terminal PWR2, so as to realize the closing of the second switch module 300.

[0052] It can be understood that by setting the first enable end PWR1 on the charge-discharge controller 100, the charge-discharge controller 100 can obtain the working voltage from the connected power grid in the charging mode of the vehicle-mounted battery 200, and by setting the second enable end PWR2 on the charge-discharge controller 100, the charge-discharge controller 100 obtains the working voltage from the vehicle-mounted battery 200 in the discharging mode of the vehicle-mounted battery 200, so as to realize that the charge-discharge controller 100 can also release the electric energy of the vehicle-mounted battery 200 to the load in the off-grid (not connected to the power grid) case.

[0053] As shown in Figure 2 In the embodiment of the present application, the charge-discharge device further comprises an electric energy meter 800, a first relay QF1 and a second relay QF2; the electric energy meter 800 is connected with the charge-discharge joint 400 and is located between the charge-discharge joint 400 and the first switch KM1 and the second switch KM2, and the electric energy meter 800 is used to measure the amount of electric energy when the vehicle-mounted battery 200 is charged or discharged. The first relay QF1 is connected between the first interface and the first switch KM1, and the second relay QF2 is connected between the second interface and the second switch KM2, and the first relay QF1 and the second relay QF2 are in a normally closed state;

[0054] As shown in Figure 2 The charge-discharge joint 400 further comprises a first controlled switch S1, a fourth resistor R4, a first terminal PE1, a second terminal CC1, a third terminal CP1, a fourth terminal L3 and a fifth terminal N3; the two ends of the first controlled switch S1 and the fourth resistor R4 in parallel are respectively connected with the first terminal PE1 and the first connection end, and one end of the first resistor R1 and the second resistor R2 in parallel is connected with the second terminal CC1;

[0055] As shown in Figure 2As shown, the vehicle includes a charge-discharge socket 500, an on-board charger 700, a vehicle controller 600, a second controlled switch S2, a third resistor R3, a fifth resistor R5 and a diode D1; the charge-discharge socket 500 includes a sixth terminal PE2, a seventh terminal CC2, an eighth terminal CP2, a ninth terminal L4 and a tenth terminal N4. The charge-discharge connector 400 is connected with the charge-discharge socket 500, and in the case where the charge-discharge connector 400 is connected with the charge-discharge socket 500, the first terminal PE1 is connected in pairs with the sixth terminal PE2, the second terminal CC1 is connected in pairs with the seventh terminal CC2, the third terminal CP1 is connected in pairs with the eighth terminal CP2, the fourth terminal L3 is connected in pairs with the ninth terminal L4, and the fifth terminal N3 is connected in pairs with the tenth terminal N4, and the ninth terminal L4 and the tenth terminal N4 are connected with the on-board battery 200 through the on-board charger 700; wherein the other end of the electric energy meter 800 is connected with the fourth terminal L3 and the fifth terminal N3; the second controlled switch S2 is connected in series with the fifth resistor R5, and then connected in parallel with the third resistor R3, one end of the third resistor R3 and the fifth resistor R5 after being connected in parallel is connected with the cathode of the diode D1, the other end of the third resistor R3 and the second controlled switch S2 is connected with the sixth terminal PE2, and the anode of the diode D1 is connected with the eighth terminal CP2, wherein the sixth terminal PE2 is grounded;

[0056] As shown in Figure 2 , the first interface includes an eleventh terminal L1 and a twelfth terminal N1, the eleventh terminal L1 is connected with the fourth terminal L3 through the electric energy meter 800, and the twelfth terminal N1 is connected with the fifth terminal N3 through the electric energy meter 800; the second interface includes a thirteenth terminal L2 and a fourteenth terminal N2, the thirteenth terminal L2 is connected with the fourth terminal L3 through the electric energy meter 800, and the fourteenth terminal N2 is connected with the fifth terminal N3 through the electric energy meter 800;

[0057] As shown in ​ , the eleventh terminal L1 and the twelfth terminal N1 are connected with the first relay QF1 and the second switch KM2 in two paths in turn, and the first relay QF1 and the second switch KM2 are both used for controlling the connection state of the eleventh terminal L1 and the twelfth terminal N1 with the fourth terminal L3 and the fifth terminal N3; the thirteenth terminal L2 and the fourteenth terminal N2 are connected with the second relay QF2 and the first switch KM1 in two paths in turn, and the second relay QF2 and the first switch KM1 are used for controlling the connection state of the thirteenth terminal L2 and the fourteenth terminal N2 with the fourth terminal L3 and the fifth terminal N3.

[0058] The working principle and process of the charge-discharge device provided by the embodiment of the application include:

[0059] The user connects the charging and discharging device to the charging and discharging socket 500 provided on the vehicle through the charging and discharging connector 400 and selects the charging and discharging mode of the vehicle; after the connection is completed, if the first interface is connected to the power grid, the first enable end PWR1 of the charging and discharging controller 100 takes power from the power grid; if the first interface is not connected to the power grid, the second enable end PWR2 of the charging and discharging controller 100 takes power from the vehicle-mounted battery 200. After the charging and discharging controller 100 starts to work, the charging and discharging mode selected by the user is received, in the case of the user selecting the charging mode, the charging and discharging controller 100 controls the first switch KM1 to be closed through the first signal end KM3 and controls the second switch KM2 to be opened through the second signal end KM3, and the power grid and the vehicle-mounted battery 200 form a charging circuit through the thirteenth terminal L2 and the fourteenth terminal N2. Among them, the current on the power grid sequentially passes through the thirteenth terminal L2 and the fourteenth terminal N2, the first relay QF1, the first switch KM1, the electric energy meter 800, the fourth terminal L3 and the fifth terminal N3, the ninth terminal L4 and the tenth terminal N4, and the vehicle-mounted charger 700 to charge the vehicle-mounted battery 200;

[0060] In the case of the user selecting the discharging mode and discharging to the power grid, the charging and discharging controller 100 controls the first switch KM1 to be closed through the first signal end KM3 and controls the second switch KM2 to be opened through the second signal end KM3, and sends a control signal through the output end DO to control the first connection end and the second connection end of the second switch module 300 to be conductive, so that the first resistor R1 and the second resistor R2 are connected in parallel, the vehicle controller 600 sets the vehicle to the discharging mode after reading the resistance value change of the first resistor R1 and the second resistor R2, and the vehicle-mounted battery 200 and the power grid form a discharging circuit through the vehicle-mounted charger 700. Among them, the current on the vehicle-mounted battery 200 sequentially passes through the vehicle-mounted charger 700, the ninth terminal L4 and the tenth terminal N4, the fourth terminal L3 and the fifth terminal N3, the electric energy meter 800, the first switch KM1, the first relay QF1, and the thirteenth terminal L2 and the fourteenth terminal N2, and finally reaches the power grid;

[0061] In the case that the user selects the discharging mode and discharges to the load, the charge-discharge controller 100 controls the first switch KM1 to be open through the first signal terminal KM3, controls the second switch KM2 to be closed through the second signal terminal KM3, and sends a control signal through the output terminal DO to control the first connection terminal and the second connection terminal of the second switch module 300 to be conductive, so that the first resistor R1 and the second resistor R2 are connected in parallel, the vehicle controller 600 sets the vehicle to the discharging mode after reading the resistance value change of the first resistor R1 and the second resistor R2, and the vehicle battery 200 forms a discharging circuit with the load through the vehicle charger 700. Among them, the current on the vehicle battery 200 passes through the vehicle charger 700, the ninth terminal L4 and the tenth terminal N4, the fourth terminal L3 and the fifth terminal N3, the electric energy meter 800, the first switch KM1, the first relay QF1 and the eleventh terminal L1 and the twelfth terminal N1 in turn, and finally reaches the load.

[0062] In summary, the charge-discharge device provided by the embodiments of the present application has two output interfaces, which are connected to the load and the power grid respectively, and the resistance value change of the resistance value adjustment module can be adjusted by the charge-discharge controller 100, so that the vehicle is adjusted to the charging mode or the discharging mode. In the charging mode, the vehicle battery 200 is charged through the power grid, and in the discharging mode, the vehicle battery 200 discharges to the power grid or the load. The resistance value adjustment of the resistance value adjustment module realizes the switching of the V2G and V2L functions of the vehicle, and improves the flexibility of the vehicle charge-discharge mode switching.

[0063] The above describes in detail the charge-discharge device provided by the embodiments of the present application, and the principles and implementation modes of the present application are described by applying specific examples. The above embodiment description is only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A charge and discharge device characterized by comprising: The application relates to a charging and discharging device. The charging and discharging device comprises a charging and discharging joint, a switch module, a first interface and a second interface. The switch module comprises a first switch module, the first switch module comprises a first switch and a second switch, the first switch is connected between the first interface and the charging and discharging joint, and the second switch is connected between the second interface and the charging and discharging joint. The charging and discharging device further comprises a second switch module and a resistance adjusting module. The charging and discharging device further comprises a charging and discharging controller, the charging and discharging controller is connected with the first switch and the second switch, and the charging and discharging controller is connected with the resistance adjusting module through the second switch module.

2. The charge and discharge device according to claim 1, wherein The charging and discharging joint comprises a first terminal and a second terminal, and the resistance adjusting module is connected between the first terminal and the second terminal.

3. The charge and discharge device according to claim 2, wherein The resistance adjusting module comprises a first resistor, and the first resistor is connected with the first terminal and the second terminal. The resistance adjusting module comprises a first resistor and a second resistor, and the first resistor and the second resistor are connected in parallel and connected with the first terminal and the second terminal.

4. The charge and discharge device according to claim 3, wherein The second switch module comprises a first connecting terminal and a second connecting terminal, one end of the first resistor is connected with one end of the second resistor, the other end of the first resistor is connected with the first connecting terminal, and the other end of the second resistor is connected with the second connecting terminal.

5. The charge and discharge device according to claim 4, wherein The charging and discharging controller comprises a first signal terminal and a second signal terminal, the first signal terminal is connected with the first switch, and the second signal terminal is connected with the second switch.

6. The charge and discharge device according to claim 4, wherein The charging and discharging controller comprises an output terminal, the second switch module comprises a first receiving terminal, and the first receiving terminal is connected with the output terminal.

7. The charge and discharge device according to Claim 6, wherein The charging and discharging controller comprises a first enable terminal and a second enable terminal, the first enable terminal is connected with the first interface, and the second enable terminal is connected with the second interface.

8. The charge and discharge device according to claim 3, wherein ​ 9. The charge and discharge device according to claim 3, wherein ​ 10. The charge and discharge device according to claim 3, wherein ​

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