Electric vehicle and electric vehicle charging system and method based on European standard charging pile

Abstract

The present invention discloses an electric vehicle charging system based on a European standard charging pile, including a charging seat interface, an electric vehicle communication controller, an on-board charger and a power battery assembly; the charging seat interface includes a DC charging port and an AC charging port, and the AC charging port includes an AC input terminal and a control terminal; the power battery assembly includes a battery management system and a power battery pack; the power battery pack is connected to the DC charging port; the electric vehicle communication controller includes a first control terminal, a second control terminal and a third control terminal, the first control terminal is connected to the control terminal; the second control terminal is connected to the on-board charger; the third control terminal is connected to the battery management system via a fast charging CAN; the on-board charger includes a power input terminal and a power output terminal, the power input terminal is connected to the AC input terminal, and the power output terminal is connected to the battery management system. The above charging system reduces the difficulty of function changes and simplifies the control strategy while being compatible with European standard charging piles.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to an electric vehicle and an electric vehicle charging system and method based on a European standard charging pile. Background Art

[0002] With the rapid development of my country's new energy vehicle industry, more and more electric vehicles are exported overseas. Due to the differences between charging standards in other regions and national standards, vehicles need to be modified according to local standards. For example, the communication method for DC charging in the European charging standard adopts Power Line Carrier (PLC) communication, which is quite different from the Controller Area Network (CAN) communication standard required by my country's standards. Therefore, my country's existing charging system architecture cannot meet the charging needs of vehicles in Europe. To meet the European standard charging, it is necessary to add an Electric Vehicle Communication Controller (EVCC) to the existing electric vehicle charging system; at the same time, in addition to transmitting electricity from the charging pile to the battery, the on-board charger also needs to detect the connection status of the charging interface and determine the voltage and current transmitted to the battery.

[0003] For example, a certain prior art discloses an electric vehicle charging system and method based on a European standard charging pile. The charging system involves an electric vehicle communication controller (EVCC), a European standard charging interface, an on-board charger (OBC) and a vehicle control unit (VCU). However, it has the following disadvantages: 1) Multiple controllers such as VCU, EVCC, OBC, and power battery control system are required to participate in the charging process; 2) The original vehicle's fast charging CAN network hardware system needs to be changed, and the control logic of the OBC software, VCU software, and BMS software needs to be changed at the same time. Therefore, there are problems such as complex function changes and complex implementation strategies, resulting in high development costs and long cycles, which is not conducive to the rapid upgrade of vehicle models to European standard charging. Summary of the invention

[0004] The present invention provides an electric vehicle and an electric vehicle charging system and method based on a European standard charging pile, so as to solve or partially solve the technical problems of complex function changes, high change cycle and high cost when the current domestic electric vehicles adapt to the European standard charging piles.

[0005] In order to solve the above technical problems, in the first aspect, according to an embodiment of the present invention, there is provided an electric vehicle charging system based on a European standard charging pile, the charging system comprising a charging seat interface, an electric vehicle communication controller, an on-board charger and a power battery assembly; the charging seat interface comprises a DC charging port and an AC charging port, the AC charging port comprises an AC input terminal and a control terminal; the power battery assembly comprises a battery management system and a power battery pack;

[0006] The power battery pack is connected to the DC charging port;

[0007] The electric vehicle communication controller includes a first control end, a second control end and a third control end, the first control end is connected to the control terminal; the second control end is connected to the on-board charger; the third control end is connected to the battery management system via a fast charging CAN;

[0008] The on-board charger includes a power input end and a power output end, the power input end is connected to the AC input terminal, and the power output end is connected to the battery management system.

[0009] Optionally, the first control end is connected to a CP terminal, a PE terminal and a PP terminal among the control terminals.

[0010] Optionally, the second control end is connected to the vehicle charger via a CC line, a PE line and a CP OUT line.

[0011] Optionally, the third control terminal is also connected to the battery management system via an A+ line and a CC2 line.

[0012] Optionally, the charging seat interface also includes a first temperature detection mechanism; the first temperature detection mechanism is used to detect the temperature of the AC input terminal.

[0013] Optionally, the charging seat interface also includes a second temperature detection mechanism; the second temperature detection mechanism is used to detect the temperature of the DC charging port.

[0014] Optionally, the charging system further includes an electronic lock connected to the vehicle-mounted charger.

[0015] Optionally, the on-board charger is connected to the battery management system via a CAN network.

[0016] Based on the same inventive concept, in a second aspect, an embodiment of the present invention provides an electric vehicle charging method based on a European standard charging pile, which is applied to any of the charging systems provided in the first aspect, and the charging method includes:

[0017] After the charging gun of the European standard charging pile is inserted into the charging seat interface, the electric vehicle communication controller obtains the charging signal sent by the European standard charging pile;

[0018] The electric vehicle communication controller determines the charging type according to the charging signal;

[0019] If the charging type is AC charging, the electric vehicle communication controller wakes up the on-board charger, and the on-board charger interacts with the battery management system via messages, so that the European standard charging pile performs AC slow charging;

[0020] If the charging type is DC charging, the electric vehicle communication controller wakes up the battery management system and enables the battery management system to enter CAN fast charging mode; the electric vehicle communication controller performs PLC communication with the European standard charging pile to enable the European standard charging pile to perform DC fast charging.

[0021] Based on the same inventive concept, in a third aspect, an embodiment of the present invention provides an electric vehicle, the electric vehicle comprising any one of the charging systems provided in the first aspect.

[0022] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0023] The present invention provides an electric vehicle charging system. By directly connecting an electric vehicle communication controller (EVCC) to a battery management system (BMS) and an on-board charger (OBC), when charging using a European standard fast charging pile, a fast charging CAN network only requires the participation of the EVCC and the BMS, and does not require the intervention of a vehicle control unit (VCU), thereby simplifying the control interaction during the charging process; after the European standard charging pile is inserted into a charging seat interface, the signals received by the BMS and the on-board charger are made consistent with those required by the national standard charging standard through conversion by the EVCC, so there is no need to change the hardware and software of the BMS and OBC currently based on the national standard charging, thereby reducing the difficulty of function change, simplifying the control strategy, reducing the development cost and shortening the development cycle, and being conducive to the rapid upgrade of vehicle models to the European standard charging.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0026] In the attached picture:

[0027] Figure 1 A block diagram of an electric vehicle charging system according to an embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of a charging dock interface according to an embodiment of the present invention is shown;

[0029] Figure 3 A detailed block diagram of an electric vehicle charging system according to an embodiment of the present invention is shown;

[0030] Figure 4 A schematic diagram showing a flow chart of an electric vehicle charging method according to an embodiment of the present invention is shown;

[0031] Figure 5 A logic control schematic diagram of a charging method according to an embodiment of the present invention is shown;

[0032] Description of reference numerals:

[0033] 1. Charging seat interface; 11. DC charging port; 12. AC input terminal; 13. Control terminal; 2. Electric vehicle communication controller; 3. On-board charger; 4. Power battery assembly; 41. Battery management system; 42. Power battery pack; 5. Electronic lock. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Throughout the specification, unless otherwise specified, the terms used herein should be understood as meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. If there is a conflict, this specification takes precedence. Unless otherwise specified, the various devices used in the present invention, etc., can be purchased from the market or can be prepared by existing methods.

[0036] Explanations of some English terms involved in this embodiment:

[0037] EVCC: Electric Vehicle Communication Controller, electric vehicle communication controller;

[0038] OBC: On Board Charger, on-board charger;

[0039] BMS: Battery Management System, battery management system;

[0040] CAN: Controller Area Network, controller area network;

[0041] PLC: Power Line Carrier.

[0042] In order to solve the problem that when the national standard electric vehicle is adapted to the European standard charging pile, the charging process requires the participation of multiple controllers such as VCU, EVCC, OBC, power battery control system, etc., and the original vehicle's fast charging CAN network hardware system needs to be changed, and the control logic of OBC software, VCU software and BMS software needs to be changed, resulting in complex function changes, complex implementation strategies, high development costs and long cycles. In an optional embodiment, as Figure 1 As shown, an electric vehicle charging system based on a European standard charging pile is provided, as follows:

[0043] The charging system includes a charging seat interface 1, an electric vehicle communication controller 2, an on-board charger 3 and a power battery assembly 4; the charging seat interface 1 includes a DC charging port 11 and an AC charging port, and the AC charging port includes an AC input terminal 12 and a control terminal 13; the power battery assembly 4 includes a battery management system 41 and a power battery pack 42;

[0044] The power battery pack 42 is connected to the DC charging port 11; the electric vehicle communication controller 2 includes a first control end, a second control end and a third control end, the first control end is connected to the control terminal 13; the second control end is connected to the on-board charger 3; the third control end is connected to the battery management system 41 via the fast charging CAN; the on-board charger 3 includes an input end and an output end, the input end is connected to the AC input terminal 12, and the output end is connected to the battery management system 41.

[0045] Specifically, the charging seat interface 1 is a socket mechanism provided on the electric vehicle for inserting the charging gun. The optional types of the charging seat interface 1 include CCS1 type female port and CCS2 type female port. Unless otherwise specified, the charging seat interface 1 in this embodiment is a CCS1 type female port. Figure 2 An example of a CCS1 female connector is shown. Figure 2 The meaning of each identifier is:

[0046] L1: AC charging phase line terminal;

[0047] N: AC charging neutral terminal;

[0048] CP: Control Pilot terminal, used to transmit analog PWM signals, or ISO 15118 or DIN SPEC 70121 digital signals modulated onto analog signals based on power line carrier (PLC);

[0049] PP: Proxmity Pilot terminal, used to transmit signals so that the electric vehicle can detect that the charging gun plug has been connected to the vehicle;

[0050] PE: Productive Earth, grounding protection lead terminal;

[0051] DC+ / DC-: DC charging terminal.

[0052] Correspondingly, the first control terminal of the EVCC is connected to the CP terminal, the PE terminal and the PP terminal of the control terminal 13 .

[0053] Optionally, the second control terminal of the EVCC is connected to the on-board charger 3 via the CC line, the PE line and the CP OUT line; the third control terminal is also connected to the battery management system 41 via the A+ line and the CC2 line.

[0054] Optionally, EVCC, OBC and BMS are all connected to the vehicle CAN network, and the transmission and interaction of various signals are realized through the CAN network.

[0055] The electric vehicle charging system provided in this embodiment directly connects the electric vehicle communication controller 2 (EVCC) to the battery management system 41 (BMS) and the on-board charger 3 (OBC). When charging with a European standard fast charging pile, the fast charging CAN network only requires the participation of the EVCC and the BMS, and does not require the intervention of the vehicle controller (VCU), thereby simplifying the control interaction during the charging process. The fast charging CAN network and the vehicle CAN network are two CAN networks standardly configured for the BMS of the national standard electric vehicle. Therefore, this embodiment connects the EVCC to the BMS via the fast charging CAN and does not change the network architecture of the original vehicle. ; If you choose another method, introduce the fast charging CAN network into the vehicle CAN network, and connect the EVCC to the vehicle CAN network of the BMS, then you need to change the CAN network architecture of the original vehicle; after the European standard charging pile is inserted into the charging seat interface 1, through the conversion of the EVCC, the signals received by the BMS and the on-board charger 3 are consistent with the requirements of the national standard charging standard. Therefore, there is no need to change the hardware and software of the BMS and OBC currently based on the national standard charging, thereby reducing the difficulty of function changes, simplifying the control strategy, reducing development costs and shortening the development cycle, which is conducive to the rapid upgrade of vehicle models to European standard charging.

[0056] In some optional embodiments, the charging seat interface 1 also includes a first temperature detection mechanism and a second temperature detection mechanism; the first temperature detection mechanism is used to detect the temperature of the AC input terminal 12, and the second temperature detection mechanism is used to detect the temperature of the DC charging port 11.

[0057] Optionally, the first temperature detection mechanism specifically includes an L1 temperature sensor and an N temperature sensor, and the L1 temperature sensor and the N temperature sensor establish a communication connection with the on-board charger 3 to transmit the temperature detection signal of the AC charging terminal to the on-board charger 3.

[0058] Optionally, the second temperature detection mechanism specifically includes a DC+ temperature sensor and a DC- temperature sensor, and the DC+ temperature sensor and the DC- temperature sensor establish a communication connection with the battery management system 41 to transmit the temperature detection signal of the DC charging terminal to the battery management system 41.

[0059] In some optional embodiments, the charging system further includes an electronic lock 5 , which is connected to the vehicle-mounted charger 3 .

[0060] Based on the charging system provided in the above embodiment, in another optional embodiment, a corresponding charging method is provided, such as Figure 4 The method comprises the following steps:

[0061] S401: After the charging gun of the European standard charging pile is inserted into the charging seat interface 1, the electric vehicle communication controller 2 obtains the charging signal sent by the European standard charging pile;

[0062] S402: The electric vehicle communication controller 2 determines the charging type according to the charging signal;

[0063] S403: If the charging type is AC charging, the electric vehicle communication controller 2 wakes up the on-board charger 3, and the on-board charger 3 interacts with the battery management system 41 via messages, so that the European standard charging pile performs AC slow charging;

[0064] S404: If the charging type is DC charging, the electric vehicle communication controller 2 wakes up the battery management system 41 and enables the battery management system 41 to enter the CAN fast charging mode; the electric vehicle communication controller 2 performs PLC communication with the European standard charging pile to enable the European standard charging pile to perform DC fast charging.

[0065] When charging with a plug, if it is a national standard charging pile, the interaction and charging are directly carried out according to the standard GB / T27930. For the European standard charging pile, a complete logic control diagram of the charging method is as follows Figure 5 As shown, the specific steps include:

[0066] S1: The European standard charging pile is plugged into the charging socket interface 1. Before plugging in the charging pile, the EVCC, BMS, and OBC are all in a dormant state.

[0067] S2: The CP signal output by the European standard charging pile wakes up the EVCC;

[0068] S3: EVCC wakes up the BMS; specifically, outputs A+ signal (12V) and CC2 signal to wake up the BMS;

[0069] S4: BMS sends CC (charging connection confirmation) status signal to EVCC;

[0070] S5: EVCC receives the PWM (pulse width modulation) signal of the CP sent by the European standard charging pile and detects the duty cycle of the PWM signal, and determines the charging type according to the value of the duty cycle: if the duty cycle is 3% to 7%, enter the DC charging control logic S61 to S66; if the duty cycle is 9% to 90%, enter the AC charging control logic S71 to S74; if the PWM signal is invalid, execute S81 to S83;

[0071] Among them, the DC charging control logic includes:

[0072] S61: EVCC message notifies BMS to enter DC charging;

[0073] S62: BMS enters the CAN fast charging process of GB / T27930;

[0074] S63: EVCC starts PLC communication with the European standard charging pile and enters fast charging mode;

[0075] S64: EVCC closes the S2 switch according to the process of GB / T27930;

[0076] S65: The European standard charging pile starts to perform DC charging on the power battery pack 42;

[0077] S66: After charging is completed, EVCC sends a message to notify BMS that charging is completed, and EVCC enters sleep mode after the gun is removed.

[0078] AC charging control logic includes:

[0079] S71: EVCC informs BMS to enter AC charging, and BMS requests EVCC to close S2 switch;

[0080] S72: EVCC outputs PWM signal and CC resistance signal (220Ω) through hard line (PE) to wake up OBC;

[0081] S73: OBC exchanges messages with BMS through the CAN network and starts AC slow charging;

[0082] S74: After charging is completed, EVCC detects the S2 disconnection state of OBC and requests to disconnect its own S2 switch. After the charging pile detects that the S2 switch of EVCC is disconnected, it stops PWM output, BMS enters sleep mode, and EVCC waits for the next PWM input. During this process, EVCC determines the S2 state of OBC by collecting the CP OUT voltage, and thus operates the S2 switch of EVCC.

[0083] The control flow of PWM signal invalid:

[0084] S81: After waiting for a period of time (e.g., 5 minutes), determine whether the PWM signal is valid and whether the fault is restored;

[0085] S82: If the fault is not recovered, the EVCC enters sleep mode;

[0086] S83: If the fault is recovered, the EVCC restarts the function.

[0087] Based on the same inventive concept as the aforementioned embodiment, in yet another optional embodiment, an electric vehicle is provided, which is charged using the charging system in the aforementioned embodiment.

[0088] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0089] The present invention provides an electric vehicle and an electric vehicle charging system and method based on a European standard charging pile, wherein the charging system directly connects an electric vehicle communication controller (EVCC) to a battery management system (BMS) and an on-board charger (OBC). When charging using a European standard fast charging pile, a fast charging CAN network only requires the participation of the EVCC and the BMS, and does not require the intervention of a vehicle control unit (VCU), thereby simplifying control interaction during the charging process; after the European standard charging pile is inserted into a charging seat interface, the signals received by the BMS and the on-board charger are made consistent with those required by the national standard charging standard through conversion by the EVCC, so that there is no need to change the hardware and software of the BMS and OBC currently based on the national standard charging, thereby reducing the difficulty of function change, simplifying the control strategy, reducing the development cost and shortening the development cycle, and facilitating the rapid upgrade of vehicle models to European standard charging.

[0090] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0091] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0092] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An electric vehicle charging system based on a European standard charging pile, characterized in that: The charging system includes a charging seat interface, an electric vehicle communication controller, an on-board charger and a power battery assembly; the charging seat interface includes a DC charging port and an AC charging port, and the AC charging port includes an AC input terminal and a control terminal; the power battery assembly includes a battery management system and a power battery pack; The power battery pack is connected to the DC charging port; The electric vehicle communication controller includes a first control end, a second control end and a third control end, the first control end is connected to the control terminal; the second control end is connected to the on-board charger; the third control end is connected to the battery management system via a fast charging CAN; The on-board charger comprises a power input end and a power output end, the power input end is connected to the AC input terminal, and the power output end is connected to the battery management system; The second control end is connected to the on-board charger via the CC line, the PE line and the CP OUT line, and the electric vehicle communication controller outputs a PWM signal and a CC resistance signal via the PE line to wake up the on-board charger.

2. The charging system according to claim 1, characterized in that: The first control end is connected to a CP terminal, a PE terminal, and a PP terminal among the control terminals.

3. The charging system according to claim 1, characterized in that: The third control terminal is also connected to the battery management system via an A+ line and a CC2 line.

4. The charging system according to claim 1, characterized in that: The charging seat interface also includes a first temperature detection mechanism; the first temperature detection mechanism is used to detect the temperature of the AC input terminal.

5. The charging system according to claim 1, characterized in that: The charging seat interface also includes a second temperature detection mechanism; the second temperature detection mechanism is used to detect the temperature of the DC charging port.

6. The charging system according to claim 1, characterized in that: The charging system also includes an electronic lock connected to the on-board charger.

7. The charging system according to claim 1, characterized in that: The on-board charger is connected to the battery management system via a CAN network.

8. A method for charging an electric vehicle based on a European standard charging pile, characterized in that: Applied to the charging system according to any one of claims 1 to 7, the charging method comprises: After the charging gun of the European standard charging pile is inserted into the charging seat interface, the electric vehicle communication controller obtains the charging signal sent by the European standard charging pile; The electric vehicle communication controller determines the charging type according to the charging signal; If the charging type is AC charging, the electric vehicle communication controller wakes up the on-board charger, and the on-board charger interacts with the battery management system via messages, so that the European standard charging pile performs AC slow charging; If the charging type is DC charging, the electric vehicle communication controller wakes up the battery management system and enables the battery management system to enter CAN fast charging mode; the electric vehicle communication controller performs PLC communication with the European standard charging pile to enable the European standard charging pile to perform DC fast charging.

9. An electric vehicle, characterized in that: The electric vehicle comprises the charging system according to any one of claims 1 to 7.

Images