Control device for external quick charging of electric automobile

Abstract

The utility model discloses an external fast charging control device for an electric automobile, which comprises an MCU (Microprogrammed Control Unit) control module, a sensor module electrically connected with the MCU control module, an AC (Alternating Current) slow charging protocol control module, a first CAN (Controller Area Network) transceiver, a second CAN transceiver, a first relay group electrically connected between the first CAN transceiver and a vehicle-mounted OBC (On Board Controller), and a second relay group electrically connected between the second CAN transceiver and the vehicle-mounted OBC, the second relay set is electrically connected between a vehicle-mounted OBC and the alternating current slow charging protocol control module, the third relay set is electrically connected between an OBC terminal of the vehicle-mounted OBC and the second CAN transceiver, and the large-voltage cable is electrically connected between a charging gun and a motor controller. The AC / DC quick charging controller is arranged between the vehicle-mounted OBC and the quick charging adapter, so that the quick charging problem of only configuring a slow charging vehicle is solved, the vehicle charging process information is controlled through the AC / DC controller, the charging information is displayed on the vehicle display screen, an original vehicle-mounted charging display interface can be simulated, and the user experience is better.

Description

Technical Field

[0001] This utility model relates to the technical field of electric vehicle charging devices, and in particular to a control device for external fast charging of electric vehicles. Background Technology

[0002] In today's society, automobiles have become a common means of transportation. How to resolve the contradiction between the increasing number of cars and the energy crisis and environmental protection has become one of the major issues. New energy vehicles (mainly referring to pure electric vehicles and hybrid electric vehicles) are an important direction for development in the coming years due to their energy efficiency, environmental friendliness, and relatively mature technology. Electric vehicles need to be charged when the battery charge drops to a certain level. Cars are equipped with charging ports, requiring external charging connection equipment to connect the car's charging port to an external power source. This external charging connection equipment mainly consists of a charging gun and its accompanying wiring harness. Connecting the charging gun to the car's charging port and the power cord to an external power source allows charging to be achieved.

[0003] However, electric vehicles are only equipped with slow charging ports, requiring the use of adapters and control units to achieve external fast charging. Existing external fast charging solutions only adapt and control the fast charging station to the original vehicle's charging gun, and cannot display the charging status and information in real time on the vehicle's infotainment screen, creating a misleading impression and resulting in a poor user experience. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a control device for external fast charging of electric vehicles, so as to solve the technical problem that the existing external fast charging solutions cannot display charging information in real time and have a poor user experience.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a control device for external fast charging of an electric vehicle, comprising: an MCU control module, a sensor module electrically connected to the MCU control module, an AC slow charging protocol control module, a first CAN transceiver, a second CAN transceiver, a first relay group electrically connected between the first CAN transceiver and the vehicle OBC, a second relay group electrically connected between the vehicle OBC and the AC slow charging protocol control module, a third relay group electrically connected between the OBC terminal of the vehicle OBC and the second CAN transceiver, and a high-voltage cable electrically connected between the charging gun and the motor controller; the sensor module is used to detect the signal that the vehicle's charging gun is plugged into a fast charging pile, and a contactor is connected in series on the high-voltage cable; when the sensor module detects a fast charging signal, the MCU control module controls the first relay group to connect the path between the first CAN transceiver and the vehicle OBC, the second relay group to connect the path between the AC slow charging protocol control module and the vehicle OBC, the third relay group to connect the path between the second CAN transceiver and the OBC terminal of the vehicle OBC, and closes the contactor.

[0007] The MCU control module includes: a sensor access detection module, a relay control module, a contactor control module, and a CAN communication control module.

[0008] One end of the first relay group is electrically connected to the CC and CP terminals of the electric vehicle's slow charging port, and the other end of the first relay group is electrically connected to the CC and CP terminals of the on-board OBC.

[0009] The first relay group is a single-pole double-throw relay, and the other end of the single-pole double-throw relay is electrically connected to the first CAN transceiver. The first CAN transceiver is also electrically connected to the CAN communication control module.

[0010] One end of the second relay group is electrically connected to the AC slow charging protocol control module, and the other end is electrically connected to the CC and CP terminals of the vehicle OBC. The AC slow charging protocol control module is also electrically connected to the MCU control module.

[0011] The sensor is either a Hall sensor or a magnetic switch. The Hall sensor or the magnetic switch is located at the slow charging port of the electric vehicle and is electrically connected to the sensor access detection module.

[0012] The OBC terminal is also provided with male and female wiring harness terminals A and B. The third relay group is a single-pole double-throw relay. The single-pole double-throw relay controls the connection between the second CAN transceiver and the wiring harness terminal A during fast charging and the connection between the wiring harness terminal A and the wiring harness terminal B during slow charging.

[0013] The OBC terminal is also electrically connected to the MCU control module via an OBC signal control module.

[0014] A fuse is also connected in series with the high-voltage cable.

[0015] The MCU control module is also electrically connected to a radio frequency unit.

[0016] This utility model discloses an external fast charging control device for electric vehicles. It sets up an AC / DC fast charging controller between the vehicle's OBC and the fast charging adapter. This not only solves the fast charging problem for vehicles equipped only with slow charging, but also controls the vehicle charging process information through the AC / DC controller and displays the charging information on the vehicle's display screen. It can also simulate the original vehicle charging display interface, resulting in a better user experience.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fast charging adapter controller, the car slow charging interface, and the external charging pile of the control device for external fast charging of electric vehicles according to an embodiment of this utility model.

[0019] Figure 2 This is a schematic diagram of the AC / DC fast charging controller and the original functional units of the vehicle in the control device for external fast charging of electric vehicles according to an embodiment of this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] For electric vehicles, which are only equipped with slow charging interfaces, an adapter charging port and control unit are needed to achieve external fast charging. Existing external fast charging solutions only adapt and control the fast charging station to the original vehicle charging gun, but cannot display the charging status and information in real time on the vehicle's display screen, causing confusion for the user and resulting in a poor experience. To solve the above problems, this embodiment discloses a control device for external fast charging of electric vehicles, which enables fast charging and provides a good user experience.

[0028] Please see Figures 1 to 2 In this embodiment, a control device for external fast charging of an electric vehicle is disclosed. This control device includes: a DC fast charging gun, a fast charging adapter controller connected to the DC fast charging gun, and an AC / DC fast charging controller connected to the fast charging adapter controller. The DC fast charging gun is adapted to connect to a fast charging station. The fast charging adapter controller is used to be compatible with both the fast charging current input from the DC charging gun and the existing AC slow charging current on the vehicle, i.e., as shown... Figure 1 The slow charging current input to the AC slow charging gun is shown.

[0029] As shown in the figure, the vehicle is equipped with an electric vehicle slow charging port and a corresponding on-board computer (OBC). A charging and distribution assembly is electrically connected to the OBC, and a battery pack and motor controller are electrically connected to the charging and distribution assembly. The AC / DC fast charging controller not only enables the fast charging current input from the DC charging gun to charge and store energy for the battery pack, but also displays the charging interface and charging information on the original vehicle infotainment display screen.

[0030] The AC / DC fast charging controller includes: an MCU control module, a sensor module electrically connected to the MCU control module, an AC slow charging protocol control module, a first CAN transceiver, a second CAN transceiver, a first relay group electrically connected between the first CAN transceiver and the vehicle OBC, a second relay group electrically connected between the vehicle OBC and the AC slow charging protocol control module, a third relay group electrically connected between the OBC terminal of the vehicle OBC and the second CAN transceiver, and a high-voltage cable electrically connected between the charging gun and the motor controller; the sensor module is used to detect the signal of the vehicle's charging gun being plugged into the fast charging pile, and a contactor is connected in series on the high-voltage cable; when the sensor module detects a fast charging signal, the MCU control module controls the first relay group to connect the path between the first CAN transceiver and the vehicle OBC, the second relay group to connect the path between the AC slow charging protocol control module and the vehicle OBC, the third relay group to connect the path between the second CAN transceiver and the OBC terminal of the vehicle OBC, and closes the contactor.

[0031] The AC / DC fast charging controller is installed inside the vehicle, such as in the trunk or engine compartment, while the sensor module is installed on the electric vehicle's slow charging port to sense the plug-in signal of the fast charging adapter.

[0032] The MCU control module includes a sensor access detection module, a relay control module, a contactor control module, and a CAN communication control module, all of which are controlled by the MCU.

[0033] One end of the first relay group is electrically connected to the CC and CP terminals of the electric vehicle's slow charging port, and the other end of the first relay group is electrically connected to the CC and CP terminals of the on-board computer (OBC). Specifically, the first relay group includes relay 1 and relay 2. One end of relay 1 is connected to the CC-IN terminal, and one end of relay 2 is connected to the CP-IN terminal. When the AC fast charging controller is in the original slow charging state, the other end of relay 1 is connected to the CC-OUT terminal, which is connected to the CC terminal of the on-board computer (OBC) via a wire. Similarly, the other end of relay 2 is connected to the CP-OUT terminal in the slow charging state, which is connected to the CP terminal of the on-board computer (OBC) via a conductor.

[0034] The first relay group consists of single-pole double-throw (SPDT) relays, with one end electrically connected to the first CAN transceiver. The first CAN transceiver is also electrically connected to the CAN communication control module. Specifically, when the AC / DC fast-charging controller is in fast-charging mode, the other ends of relays 1 and 2 in the first relay group switch to the CAN-L and CAN-H terminals, respectively. Both the CAN-L and CAN-H terminals are electrically connected to the first CAN transceiver, which is electrically connected to the MCU control module.

[0035] One end of the second relay group is electrically connected to the AC slow charging protocol control module, and the other end is electrically connected to the CC and CP terminals of the vehicle OBC. The AC slow charging protocol control module is also electrically connected to the MCU control module. Specifically, the second relay group includes relay 3 and relay 4, one end of which is electrically connected to the AC slow charging protocol control module, and the other end of which is electrically connected to the CP and CC terminals of the vehicle OBC, respectively.

[0036] In this embodiment, the sensor is a Hall sensor or a magnetic switch, which is disposed at the slow charging port of the electric vehicle and electrically connected to the sensor access detection module. It is understood that in other embodiments, the sensor can also be any other detection unit capable of detecting the signal indicating that the DC charging gun and fast charging pile are in a plugged-in state.

[0037] To enable communication between the vehicle's OBC and external fast charging stations, the OBC terminal is also equipped with male and female auxiliary wiring harness terminals A and B, which replace the vehicle's original wiring harness terminals. The C and D signal terminals of auxiliary wiring harness terminals A and B are respectively connected and electrically connected to the corresponding terminals of the OBC terminal.

[0038] The third relay group is a single-pole double-throw relay. This relay controls the connection between the second CAN transceiver and terminal A of the added wiring harness during fast charging, and connects the connection between terminal A and terminal B of the added wiring harness during slow charging. Specifically, the third relay group includes relays 5 and 6. When the AC / DC fast charging controller is in slow charging mode, relays 5 and 6 connect the corresponding CAN-L and CAN-H ports of terminal A and terminal B of the added wiring harness, respectively. When the AC / DC fast charging controller is in fast charging mode, relays 5 and 6 switch to the second CAN transceiver, which is also electrically connected to the MCU control module.

[0039] The first relay group, the second relay group, and the third relay group are all controlled by the relay control module within the MCU control module.

[0040] The OBC terminal is electrically connected to the MCU control module via an OBC signal control module. Specifically, the input terminal of the OBC signal control module is electrically connected to the C and D signal terminals of the wiring harness terminals A and B.

[0041] A fuse is also connected in series on the high-voltage cable. The high-voltage, high-current fuse can be located at the positions F1, F2, F3, or F4 in the diagram. Specifically, the vehicle's own electric vehicle slow-charging port has reserved interfaces L2 and L3. During slow charging, interfaces L2 and L3 are idle. In this embodiment's external fast-charging scheme, after connecting an external fast-charging adapter controller using interfaces L2 and L3, it is electrically connected to the DC+ and DC- interfaces of the DC charging gun to achieve electrical connection with the fast-charging pile. The contactors connected in series on the high-voltage cable are high-voltage contactors, specifically high-voltage contactors S1 and S2. High-voltage contactors S1 and S2 are connected in parallel to the DC+ and DC- ports of the electrical controller. This motor controller is used to charge the battery pack in reverse when the user presses the brake pedal, using this reverse charging circuit to achieve DC fast charging. The high-voltage contactors S1 and S2 are controlled by the contactor control module of the MCU control module.

[0042] Furthermore, the MCU control module is also electrically connected to a radio frequency (RF) unit. This RF unit is used for wireless communication with external mobile terminals such as mobile phones and tablets, and outputs charging information to the terminal device display or the backend cloud server for storage.

[0043] Please refer to it again. Figure 2 The AC / DC fast charging controller draws power from the fuse box or the vehicle's OBC (On-Board Circuit Breaker) via a 9-16V supply. After passing through the TVS surge protection circuit, reverse connection protection circuit, DC-DC power module, and LDO power module within the controller, a stable 12V output is provided to power the Hall sensor and the secondary power supply within the controller. The fast charging adapter controller has a magnet as a sensing source. When the fast charging adapter is inserted, the Hall sensor detects the change in magnetic force and outputs a signal to the AC / DC fast charging controller, activating the 12V input power to other modules in the control system. The entire control system then begins operation, awaiting the charging gun and QR code scanning. When the adapter is not inserted, only the Hall sensor requires 12V power; the other modules are unpowered and inactive, thus minimizing controller power consumption and protecting the vehicle's battery from depletion.

[0044] When the AC / DC fast charging controller does not detect the insertion of a fast charging adapter, relays 1 and 2 are connected to the CC-OUT and CP-OUT terminals, respectively. This means that the CC and CP terminals of the original vehicle's slow charging interface are connected to the CC and CP terminals of the vehicle's OBC by default. Relays 3 and 4 are connected to the NC terminal by default, i.e., in a floating, disconnected state. At the same time, relays 5 and 6 connect the corresponding CAN-H and CAN-L terminals of the added wiring harness A and added wiring harness B by default, without performing any action on the CC, CP, CAN-H, and CAN-L terminals of the original vehicle's OBC. When an AC slow charging gun is inserted, the L1, PE, CC, and CP terminals of the AC slow charging gun are connected to the corresponding lines of the vehicle's OBC.

[0045] When DC fast charging is required, the fast charging adapter needs to be inserted. The Hall sensor detects the change in magnetic force and outputs a signal to the AC / DC fast charging controller, turning on the 12V input power of other modules in the control device. At the same time, the power LDO module circuit works, outputting the required 5V / 3.3V to power other power-consuming modules. The control device starts working, and the MCU control module controls the switching of relay 1 and relay 2. The CC_IN and CP_IN terminals are connected to the CAN_L and CAN_H terminals of the first CAN transceiver in the AC / DC fast charging controller, respectively. The CC and CP terminals of the adapter are connected to the charging gun's S+ (i.e., CAN_H) and S- (i.e., CAN_L). The switching control of relay 1 and relay 2 enables the CAN transceiver CAN_H and CAN_L network in the controller to connect to the S+ and S- terminals in the charging pile. The MCU control module can establish CAN communication with the charging pile through this physical link.

[0046] When the user inserts the DC charging gun and scans the code to start charging, the DC charging pile sends a handshake protocol via S+ and S- to the MCU control module of the AC / DC fast charging controller. The MCU control module controls relays 3 and 4 to close, opening the hardware path between the original vehicle's AC slow charging protocol module and the CC and CP terminals of the on-board computer (OBC). Simultaneously, the MCU control module simulates sending a slow charging protocol through the AC slow charging protocol control module to activate the battery. At the same time, the MCU control module controls relays 5 and 6 to switch at the required logical moments, disconnecting the original vehicle's wiring harness terminals CAN_H and CAN_L from the on-board computer's CAN network, and connecting them to the CAN transceiver modules CAN_H and CAN_L of the MCU control module. CAN_H and CAN_L are differential networks; disconnecting only one signal network, such as CAN_H or CAN_L, is sufficient to disconnect the CAN communication between the on-board computer and the original vehicle. The MCU control module sends the original vehicle's charging message and the original vehicle's CAN gateway through the second CAN transceiver to put the vehicle into charging mode, and can also lock the vehicle and turn off the engine. The MCU control module communicates with the original vehicle's CAN gateway via a second CAN transceiver, allowing it to obtain information from the original vehicle's BMS system, such as battery pack charge, current voltage, SOC percentage, individual cell voltage, and individual cell temperature. The AC / DC fast charging controller integrates a radio frequency unit (Bluetooth / Wi-Fi module) that enables wireless data transmission and interaction with mobile devices such as smartphones and tablets. This allows the obtained information, including the original vehicle's current voltage, OC percentage, individual cell voltage, and individual cell temperature, to be displayed on mobile apps / apps, improving user experience and awareness.

[0047] Both the first CAN transceiver and the second CAN transceiver are controlled by the CAN communication control module within the MCU control module.

[0048] This utility model discloses an external fast charging control device for electric vehicles. It sets up an AC / DC fast charging controller between the vehicle's OBC and the fast charging adapter. This not only solves the fast charging problem for vehicles equipped only with slow charging, but also controls the vehicle charging process information through the AC / DC controller and displays the charging information on the vehicle's display screen. It can also simulate the original vehicle charging display interface, resulting in a better user experience.

[0049] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A control device for external fast charging of an electric vehicle, characterized by, The application relates to an electric vehicle charging system, which comprises an MCU control module, a sensor module electrically connected to the MCU control module, an AC slow charging protocol control module, a first CAN transceiver, a second CAN transceiver, a first relay group electrically connected between the first CAN transceiver and an on-board OBC, a second relay group electrically connected between the on-board OBC and the AC slow charging protocol control module, a third relay group electrically connected between an OBC terminal of the on-board OBC and the second CAN transceiver, and a high-voltage cable electrically connected between a charging gun and a motor controller; the sensor module is used for detecting that a charging gun of a vehicle is plugged into a fast charging pile; when the sensor module detects a fast charging signal, the MCU control module controls the first relay group to connect a path between the first CAN transceiver and the on-board OBC, controls the second relay group to connect a path between the AC slow charging protocol control module and the on-board OBC, controls the third relay group to connect a path between the second CAN transceiver and the OBC terminal of the on-board OBC, and closes a contactor. The MCU control module comprises a sensor access detection module, a relay control module, a contactor control module and a CAN communication control module.

2. The control device of the external fast charging of the electric vehicle according to claim 1, characterized in that, One end of the first relay group is electrically connected to CC and CP ends of an electric vehicle slow charging port, and the other end of the first relay group is electrically connected to CC and CP ends of the on-board OBC.

3. The control device of the external fast charging of the electric vehicle according to claim 2, characterized in that, The first relay group is a single-pole double-throw relay, one end of the single-pole double-throw relay is electrically connected to the first CAN transceiver, and the first CAN transceiver is further electrically connected to the CAN communication control module.

4. The control device of the external fast charging of the electric vehicle according to claim 3, characterized in that, One end of the second relay group is electrically connected to the AC slow charging protocol control module, and the other end is electrically connected to CC and CP ends of the on-board OBC; the AC slow charging protocol control module is further electrically connected to the MCU control module.

5. The control device of the external fast charging for the electric vehicle according to claim 2, characterized in that, The sensor is a Hall sensor or a magnetic switch, the Hall sensor or the magnetic switch is arranged in the electric vehicle slow charging port, and the Hall sensor or the magnetic switch is electrically connected to the sensor access detection module.

6. The control device of the external fast charging of the electric vehicle according to claim 2, wherein The OBC terminal is further provided with male and female combined additional wiring harness terminals A and B; the third relay group is a single-pole double-throw relay, the single-pole double-throw relay controls to connect a path between the second CAN transceiver and the additional wiring harness terminal A during fast charging, and controls to connect a path between the additional wiring harness terminal A and the additional wiring harness terminal B during slow charging.

7. The control device of the external fast charging for the electric vehicle according to claim 2, characterized in that, The OBC terminal and the MCU control module are further electrically connected to an OBC signal control module.

8. The control device of the external fast charging of the electric vehicle according to claim 7, characterized in that, A fuse is further connected in series on the high-voltage cable.

9. The control device of the external fast charging for the electric vehicle according to claim 2, characterized in that, A radio frequency unit is further electrically connected to the MCU control module.

10. The control device of the external fast charging of the electric vehicle according to any one of claims 1 to 9, characterized in that, ​

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