Charging system, charging control method and vehicle

Abstract

To provide a charging system, a charging control method and a vehicle.SOLUTION: A charging system includes an on-vehicle charger, a wakeup auxiliary circuit, and a battery management system, and the wakeup auxiliary circuit includes a first diode and a second diode, wherein the positive electrode of the first diode is electrically connected to a charging output port of the on-vehicle charger, the positive electrode of the second diode is electrically connected to a DC charging vehicle connection part, and the negative electrode of the first diode and the negative electrode of the second diode are electrically connected to the same port of the battery management system.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on November 22, 2023, with the application number 202311572679.7, and the entire content of the above application is incorporated herein by reference. This application relates to the field of battery technology, specifically to a charging system, a charging control method, and a vehicle.

Background Art

[0002] In the charging process of electrical equipment (such as electric vehicles), it is necessary to activate and wake up the Battery Management System (BMS) to control the electrical equipment for DC charging or AC charging. Corresponding to the two charging methods of DC charging and AC charging, the activation wake-up methods of the battery management system include DC charging wake-up and AC charging wake-up.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In related technologies, when an electrical device performs AC charging, its Control Pilot (CP) signal is detected by a vehicle controller, and thereby DC charging wake-up and AC charging wake-up respectively use the I / O connection part of the battery management system, resulting in an excessive number of connection parts of the battery management system and high costs.

Means for Solving the Problems

[0004] In a first aspect, the present disclosure provides a charging system applicable to a vehicle. The charging system includes an in-vehicle charger, a wake-up assist circuit, and a battery management system. The in-vehicle charger is provided with a charging input port and a charging output port. The wake-up assist circuit includes a first diode and a second diode. The anode of the first diode is electrically connected to the charging output port, the anode of the second diode is electrically connected to the DC charging vehicle connection part, the cathodes of the first diode and the second diode are electrically connected to the same port of the battery management system. The first diode is configured to transmit an AC charging wake-up signal transmitted from an AC charging stand, and the AC charging wake-up signal is configured to wake up the battery management system during AC charging. The second diode is configured to transmit a DC charging wake-up signal transmitted from a DC charging stand, and the DC charging wake-up signal is configured to wake up the battery management system during DC charging.

[0005] In a second aspect, the present disclosure provides a charging control method applicable to a charging system. The charging control method includes obtaining a wake-up signal and a message signal, where the wake-up signal is a DC charging wake-up signal or an AC charging wake-up signal, and the message signal is a DC rapid charging mode message signal or an AC slow charging mode message signal; waking up the battery management system based on the wake-up signal; activating a target charging mode corresponding to the message signal based on the message signal; and charging the vehicle in the target charging mode.

[0006] In a third aspect, the present disclosure provides a vehicle. The vehicle includes the charging system provided in the first aspect or executes the charging control method provided in the second aspect.

Advantages of the Invention

[0007] The charging system provided in this application realizes the ability to transmit two charging wake-up signals using the same port of the battery management system by connecting the negative electrodes of the first diode and the second diode in parallel to the same port of the battery management system. Thereby, the number of connection parts of the battery management system occupied by charging wake-up is reduced, and the cost is reduced.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] In the description of this application, unless otherwise clearly defined and limited, the terms "associated", "connected", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, integrated, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements.

[0010] In this application, unless otherwise clearly specified and limited, for the first feature to be "above" or "below" the second feature may include that the first feature is in direct contact with the second feature, or may also include that the first feature and the second feature are not in direct contact but are in contact through another feature therebetween. And for the first feature to be "above", "above the top", "upper surface" of the second feature may include that the first feature is directly above and obliquely above the second feature, or may also include that the horizontal height of the first feature is higher than that of the second feature. For the first feature to be "below", "below the bottom", "lower surface" of the second feature may include that the first feature is directly below and obliquely below the second feature, or may also include that the horizontal height of the first feature is lower than that of the second feature.

[0011] In the description of this embodiment, terms such as "above", "below", "left", "right", "front", "rear" for orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are for the purpose of facilitating the description and simplifying the operation, and do not indicate or imply that the indicated device or element must be configured and operated in a specific orientation by having a specific orientation. Therefore, it should not be construed as a limitation to this application. Also, the terms "first" and "second" are used for distinction in the description and have no special meaning.

[0012] Referring to FIG. 1, FIG. 1 is a block diagram of the charging system of this application. As shown in FIG. 1, the charging system is applied to vehicle 10. The charging system includes an on-board charger 101 (On-borad charger, OBC), a wake-up auxiliary circuit 102, and a battery management system 103.

[0013] Here, the in-vehicle charger 101 is provided with a charging input port and a charging output port. The wake-up auxiliary circuit 102 includes a first diode and a second diode. The anode of the first diode is electrically connected to the charging output port, the anode of the second diode is electrically connected to the DC charging vehicle connection part, and the cathodes of the first diode and the second diode are electrically connected to the same port of the battery management system 103. The first diode is configured to transmit an AC charging wake-up signal transmitted from an AC charging stand, and the AC charging wake-up signal is configured to wake up the battery management system 103 during AC charging. The second diode is configured to transmit a DC charging wake-up signal transmitted from a DC charging stand, and the DC charging wake-up signal is configured to wake up the battery management system 103 during DC charging.

[0014] By connecting the cathodes of the first diode and the second diode in parallel to the same port of the battery management system 103, it is realized that two charging wake-up signals can be transmitted using the same port of the battery management system, thereby reducing the number of connection parts of the battery management system occupied by charging wake-up and reducing the cost.

[0015] Referring to FIG. 2, FIG. 2 is a structural diagram of the charging system of the present application. As shown in FIG. 2, the vehicle further includes a vehicle connection part 104 and a battery pack 105. Both the battery management system 103 and the battery pack 105 belong to a part of the battery pack 100, and by electrically connecting the battery management system 103 to the battery pack 105, the battery pack 105 is managed and controlled.

[0016] Incidentally, the charging methods of electric vehicles can be divided into rapid charging and slow charging. Rapid charging is a method of charging an electric vehicle using a rapid charging station (i.e., a DC charging station), and slow charging is a method of charging an electric vehicle using a slow charging station (i.e., an AC charging station). An off-vehicle charger 101 may be installed in the DC charging station, and by converting an AC power supply into a DC power supply, the electric vehicle can be rapidly charged. An off-vehicle charger 101 may not be installed in the AC charging station. Corresponding to the AC charging station, an on-vehicle charger 101 is installed in the vehicle. The AC charging station is configured to provide a standard AC charging interface, and the on-vehicle charger 101 is configured to convert the received AC current into a DC power supply to charge the battery pack 105.

[0017] In the present application, although not shown in FIG. 2, the charging system may include a charging station, and the charging station is a DC charging station or an AC charging station. Correspondingly, the vehicle interface 104 includes a DC charging vehicle interface 1042 and an AC charging vehicle interface 1041. The DC charging vehicle interface 1042 is electrically connected to the DC charging station, and the AC charging vehicle interface 1041 is electrically connected to the AC charging station.

[0018] Optionally, the DC charging vehicle interface 1042 is electrically connected to the DC charging station via a charging gun conforming to the DC charging standard, and the AC charging vehicle interface 1041 is electrically connected to the AC charging station via a charging gun conforming to the AC charging standard. The positive electrode of the second diode is electrically connected to the DC charging vehicle interface 1042 to transmit a DC charging wake-up signal.

[0019] In one embodiment, as shown in FIG. 2, the charging system further includes a high-voltage distribution box 106, and the high-voltage distribution box 106 is electrically connected to a DC charging vehicle interface 1042 and an on-vehicle charger 101. When charging in DC mode, a DC signal may be sent to the high-voltage distribution box 106 via the DC charging vehicle interface 1042. When charging in AC mode, an AC signal first needs to be converted into a DC signal via the on-vehicle charger and then the converted DC signal is sent to the high-voltage distribution box 106. After processing the DC signal, the high-voltage distribution box 106 can use the processed DC signal to charge the battery pack 105.

[0020] In one embodiment, the on-vehicle charger 101 is provided with a charging input port and a charging output port. The charging input port is electrically connected to an AC charging vehicle interface 1041, and the charging output port is electrically connected to the high-voltage distribution box 106.

[0021] Referring to FIG. 2, the charging system further includes a vehicle controller 107, and the vehicle controller 107 is electrically connected to the high-voltage distribution box 106 to control the high-voltage distribution box 106 to process a DC signal.

[0022] Referring to FIG. 3, FIG. 3 is a diagram of the wake-up auxiliary circuit of the present application. As shown in FIG. 3, the wake-up auxiliary circuit 102 includes a first diode D1 and a second diode D2. The anode of the first diode D1 is electrically connected to the charging output port to transmit an AC charging wake-up, and the AC charging wake-up is configured to wake up the battery management system 103 during AC charging. The anode of the second diode D2 is electrically connected to the DC charging vehicle interface 1042 to transmit a DC charging wake-up signal, and the DC charging wake-up signal is configured to wake up the battery management system 103 during DC charging.

[0023] In one embodiment, the battery management system 103 is provided with a charging wake-up port, and the negative electrodes of the first diode D1 and the second diode D2 are electrically connected to the same charging wake-up port A+ of the battery management system 103.

[0024] By connecting the negative electrodes of the first diode and the second diode in parallel to the same charging wake-up port of the battery management system 103, it is realized that two charging wake-up signals can be transmitted using the same port of the battery management system, thereby reducing the number of connection parts of the battery management system 103 occupied by charging wake-up and reducing costs. Also, since the diode has unidirectional conductivity, it does not affect AC charging when the DC charging wake-up signal is operating, and does not affect DC charging when the AC charging wake-up signal is operating. That is, DC charging wake-up and AC charging wake-up are independent of each other, and neither affects the other, enhancing the safety of the charging wake-up process.

[0025] Referring to FIG. 4, FIG. 4 is an application diagram of the charging system of the present application. As shown in FIG. 4, the charging system is divided into a charging stand side and a vehicle side. A vehicle plug is installed on the charging stand, a vehicle socket is installed on the vehicle, and the vehicle plug and the vehicle socket can achieve electrical connection through a charging gun. In some embodiments, the vehicle socket and the vehicle interface 104 may be the same component. It should be noted that FIG. 4 mainly illustrates the AC charging method, and the charging stand in FIG. 4 may be an AC charging stand.

[0026] In one embodiment, the vehicle connection portion 104 includes a control guide pin, and the control guide pin is configured to transmit a control guide (CP) signal transmitted from the DC charging stand or the AC charging stand. The control guide signal can be configured for monitoring and controlling the charging state. The vehicle further includes a third diode D3. The positive electrode of the third diode D3 is electrically connected to the control guide pin, and the negative electrode of the third diode D3 is electrically connected to the battery management system 103. The negative electrode of the third diode D3 is the first detection point, that is, detection point 1.

[0027] In one embodiment, the vehicle interface 104 further includes a ground pin PE, the ground pin PE is grounded, and the vehicle further includes a first resistor R1, a second resistor R2, and a first switch S1. The first end of the first resistor R1 is electrically connected to the negative electrode of the third diode D3, the second end of the first resistor R1 is electrically connected to the ground pin PE, the first end of the second resistor R2 is electrically connected to the negative electrode of the third diode D3, the second end of the second resistor R2 is electrically connected to the first end of the first switch S1, the second end of the first switch S1 is electrically connected to the ground pin PE, and the third end of the first switch S1 is electrically connected to the battery management system 103. The first switch S1 is configured to control whether the second resistor R2 is connected to the ground, and the battery management system 103 controls the switch state of the first switch S1.

[0028] Optionally, the first switch S1 may be a low-voltage relay. The resistance value of the second resistor R2 is equal to the resistance value of the first resistor R1.

[0029] In one embodiment, the charging stand includes a power supply control device, a second switch S2, and a third resistor R3. The power supply control device is provided with a power supply output terminal, a power supply ground terminal, a detection terminal, and a control signal output terminal. The power supply output terminal is electrically connected to the battery management system 103, the power supply ground terminal is grounded, the first terminal of the second switch S2 is electrically connected to the control signal output terminal (PWM) or the power supply output terminal (+12V), the second terminal of the second switch S2 is electrically connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is electrically connected to the control guide pin and the detection terminal. The second terminal of the third resistor R3 is the second detection point, that is, detection point 2.

[0030] Optionally, the resistance value of the third resistor R3 is half of the resistance value of the first resistor R1.

[0031] In one embodiment, the vehicle connection part 104 further includes a charging connection confirmation pin. The charging connection confirmation pin is configured to transmit a charging connection confirmation (CC) signal, and the charging connection confirmation signal may be configured to confirm whether the vehicle plug and the vehicle socket are completely connected in the low-speed charging mode. The charging stand further includes a fourth resistor. The first terminal of the fourth resistor is electrically connected to the charging connection confirmation pin and is connected to the battery management system 103 through the charging connection confirmation pin, and the second terminal of the fourth resistor R4 is grounded. Here, the vehicle plug can be an external charging interface of the charging stand, and the fourth resistor R4 may be installed in the vehicle plug.

[0032] In one embodiment, the vehicle interface 104 further includes three-phase alternating current pins, for example, L and N in FIG. 4. A third switch K1 and a fourth switch K2 may be respectively installed between the L line and the N line between the three-phase alternating current pins and the charging stand side, and are configured to control whether to output the three-phase alternating current on the charging stand side to the vehicle interface 104. DC+ represents the positive DC charging voltage when charging the vehicle with DC, and DC- represents the negative DC charging voltage when charging the vehicle with DC.

[0033] This application further includes a vehicle, and the vehicle includes executing the charging system provided by this application or the charging control method provided by this application. In addition to the charging system, other systems or components may be installed in the vehicle, and it is understood that this application is not limited to other systems or components of the vehicle.

[0034] Referring to FIG. 5, FIG. 5 is a flowchart of the charging control method of this application. In this application, the charging control method is applied to the charging system. Here, the execution entity of the charging control method may be the battery management system 103, and a processor is installed in the battery management system 103, and the processor is configured to execute the charging control method.

[0035] As shown in FIG. 5, the charging control method includes step S1, step S2, step S3, and step S4.

[0036] Step S1: Obtain a wake-up signal and a message signal, where the wake-up signal is a DC charging wake-up signal or an AC charging wake-up signal, and the message signal is a DC rapid charging mode message signal or an AC slow charging mode message signal.

[0037] In one embodiment, when the DC charging vehicle interface 1042 of the vehicle is connected to the charging plug of the DC charging stand, the DC charging wake-up signal is transmitted from the DC charging device in the DC charging stand and sent to the charging wake-up port A+ of the battery management system 103 through the DC charging vehicle interface 1042 to activate the battery management system 103. A communication bus such as a CAN bus may be arranged in the vehicle, and the communication bus can identify a specific charging mode. After the DC charging vehicle interface 1042 of the vehicle is connected to the charging plug of the DC charging stand, the communication bus automatically generates a DC rapid charging mode message signal and transmits the DC rapid charging mode message signal to the battery management system 103.

[0038] In one embodiment, when the AC charging vehicle interface 1041 of the vehicle is connected to the charging plug of the AC charging stand, the AC charging wake-up signal is transmitted from the on-board charger 101 and sent to the charging wake-up port A+ of the battery management system 103 to activate the battery management system 103. A communication bus such as a CAN bus may be arranged in the vehicle, and the communication bus can identify a specific charging mode. After the AC charging vehicle interface 1041 of the vehicle is connected to the charging plug of the AC charging stand, the communication bus automatically generates an AC low-speed charging mode message signal and transmits the AC low-speed charging mode message signal to the battery management system 103.

[0039] Step S2: Wake up the battery management system based on the wake-up signal.

[0040] In one embodiment, the wake-up signal may be a DC charging wake-up signal or an AC charging wake-up signal. The DC charging wake-up signal can wake up the battery management system 103 in a DC charging scenario so that the battery management system operates normally in the DC charging scenario. The AC charging wake-up signal can wake up the battery management system 103 in an AC charging scenario so that the battery management system operates normally in the AC charging scenario.

[0041] Step S3: Activate the target charging mode corresponding to the message signal based on the message signal.

[0042] In one embodiment, after the battery management system 103 is woken up by the wake-up signal, based on the message signal, the target charging mode corresponding to the message signal is activated, and the target charging information corresponding to the target charging mode is generated.

[0043] In one embodiment, the target charging mode may be a DC fast charging mode or an AC slow charging mode. The battery management system 103 may be woken up by a DC charging wake-up signal or an AC charging wake-up signal. After the battery management system 103 is woken up by the DC charging wake-up signal, it can start the DC fast charging mode based on the received DC charging mode message signal and generate target charging information corresponding to the target charging mode in the DC charging mode. At this time, the target charging information may be DC charging current and DC charging voltage information.

[0044] In one embodiment, after the battery management system 103 is woken up by the AC charging wake-up signal, it can start the AC fast charging mode based on the received AC charging mode message signal and generate target charging information corresponding to the target charging mode in the AC charging mode. At this time, the target charging information may be AC charging current and AC charging voltage information.

[0045] Step S4: Charge the vehicle in the target charging mode.

[0046] Referring to FIG. 6, FIG. 6 is a diagram of the charging control method of the present application. As shown in FIG. 6, after connecting the vehicle plug and the vehicle interface 104, first, the power supply is turned on using the power supply control device on the charging stand side, and the power supply control device may be a low-voltage auxiliary power supply. After the power supply control device operates normally, a 12V power supply is output and supplied to the battery management system 103, the vehicle controller 107, the on-vehicle charger 101, etc. on the vehicle side. If the power-on process fails, the charging process can be directly terminated.

[0047] When the power-on is successful, the startup of the battery management system 103 is started using a DC wake-up signal or an AC wake-up signal. When the battery management system 103 receives a wake-up signal, it can further receive a charging mode message corresponding to the wake-up signal from the communication bus, and after receiving the charging mode message, it can generate target charging information to start the corresponding charging mode. If the battery management system 103 does not receive a wake-up signal or a charging mode message, the charging process can be directly terminated.

[0048] When the battery management system 103 starts in the AC slow charging mode, the battery management system 103 further determines whether the CC signal and the CP signal meet the requirements, and on the premise of meeting the requirements, it is necessary to enter the AC charging process. When the battery management system 103 starts in the DC fast charging mode, the battery management system 103 further determines whether the CC2 signal meets the requirements, and on the premise of meeting the requirements, it is necessary to enter the DC charging process. Whether it is the fast charging mode or the slow charging mode, the charging process can be directly terminated without meeting the above requirements.

[0049] Referring to FIG. 7, FIG. 7 is a diagram of the AC slow charging mode of the present application. Hereinafter, the specific operation process of the charging control method in combination with the AC slow charging mode will be described.

[0050] In one embodiment, the target charging mode includes an AC slow charging mode and a DC fast charging mode. Charging the vehicle in the target charging mode includes step S31, step S32, and step S33.

[0051] Step S31: When the target charging mode is the AC slow charging mode, obtain the voltage signal at the first detection point.

[0052] In one embodiment, when the target charging mode is the AC slow charging mode, the battery management system 103 can detect the voltage signal at the first detection point immediately after the start of the AC slow charging mode.

[0053] Step S32: Determine whether the voltage signal at the first detection point is a pulse width modulation signal with a predetermined first amplitude.

[0054] In one embodiment, optionally, the first amplitude is 9V. The first end of the second switch may be connected to the control signal output terminal (PWM) or may be connected to the power supply output terminal (+12V). Before the vehicle plug is inserted into the vehicle interface 104, the second switch is connected to the power supply output terminal. The power supply control device identifies the charging connection state by detecting the voltage signal at detection point 2. After the vehicle plug is connected to the vehicle interface 104, when the battery management system 103 detects that the voltage at the first detection point is 9V and the power supply control device detects that the voltage at detection point 2 is 9V, it is determined that the charging connection is complete. At this time, the power supply control device switches and connects the first end of the second switch to the control signal output terminal. The power supply control device emits a PWM signal.

[0055] Step S33: Charge the vehicle when the voltage signal at the first detection point is a pulse width modulation signal with a predetermined first amplitude.

[0056] Here, charging the vehicle when the voltage signal at the first detection point is a pulse width modulation signal with a predetermined first amplitude includes step S331 and step S332.

[0057] Step S331: Close the first switch when the voltage signal at the first detection point is a pulse width modulation signal with a predetermined first amplitude.

[0058] The battery management system 103 detects a PWM signal with a voltage of 9V at the first detection point, and when the power supply control device detects a PWM signal with a voltage of 9V at the second detection point, it indicates that the charging state at this time is a state where the charging facility is ready. At this time, the battery management system 103 controls to close the first switch, so that both the first detection point and the second detection point become PWM signals of 6V, and the AC charging stand enters the AC low-speed charging state to charge the vehicle.

[0059] Step S332: Detect whether the voltage signal at the first detection point is a pulse width modulation signal with a predetermined second amplitude. When the voltage signal at the first detection point is a pulse width modulation signal with a predetermined second amplitude, charge the vehicle.

[0060] Optionally, the second amplitude is 6V.

[0061] Here, when the voltage signal at the first detection point is a pulse width modulation signal with a predetermined second amplitude, charging the vehicle includes step A1, step A2, step A3, step A4, and step A5.

[0062] Step A1: Obtain the cable rated power capacity of the charging stand corresponding to the resistance value of the fourth resistor.

[0063] Step A2: Determine the first maximum charging current of the charging stand based on the cable rated power capacity.

[0064] In one embodiment, the battery management system 103 detects the resistance value of the fourth resistor, and based on the resistance value of the fourth resistor, obtains the cable rated power capacity of the charging stand, thereby obtaining the first maximum charging current supported by the charging stand. Here, the resistance value of the fourth resistor has a one-to-one relationship with the cable rated power capacity. Different resistance values of the fourth resistor correspond to different cable rated power capacities.

[0065] Step A3: Obtain the duty ratio information of the pulse width modulation signal with a predetermined second amplitude.

[0066] Step A4: Determine the second maximum charging current of the charging stand based on the duty ratio information.

[0067] In one embodiment, the battery management system 103 detects the duty ratio information of the PWM signal, identifies the second maximum charging current of the charging stand based on the duty ratio information, and obtains a relatively small charging current.

[0068] Step A5: Determine a target charging current based on the first maximum charging current and the second maximum charging current, and charge the vehicle with the target charging current.

[0069] Here, determining a target charging current based on the first maximum charging current and the second maximum charging current, and charging the vehicle with the target charging current includes Step A51 and Step A52.

[0070] Step A51: Compare the first maximum charging current and the second maximum charging current.

[0071] Step A52: When the first maximum charging current is greater than the second maximum charging current, charge the vehicle with the second maximum charging current as the target charging current; when the first maximum charging current is less than or equal to the second maximum charging current, charge the vehicle with the first maximum charging current as the target charging current.

[0072] In one embodiment, the vehicle interface 104 may further include a CC2 pin, and the CC2 pin is configured as a charging connection confirmation in the DC rapid charging mode. The operation process in the DC rapid charging mode is similar to the operation process in the AC slow charging mode, and will not be described repeatedly here.

[0073] As described above, when the CP signal in the related art is detected by the vehicle controller 107, after the vehicle controller 107 is detected, the related information is transmitted to the battery management system 103. The battery management system 103 further issues voltage and current information for charging based on the duty ratio information. The vehicle controller 107 executes the charging process again based on the billing information, so the charging process becomes complicated, there are many charging procedures, and the error occurrence rate is high. In contrast, in this application, by receiving the wake-up signal and the message signal, after the battery management system 103 is woken up by the wake-up signal, it starts in the target charging mode corresponding to the message signal based on the message signal. Then, the process of detecting the CP signal and the duty ratio using the battery management system 103 and converting the received data is deleted. The battery management system 103 can directly issue a request for charging current information based on the CP signal and the duty ratio information detected by itself, solving the complex problem of the charging signal identification process, simplifying the detection and identification process of the charging signal, reducing the operation procedures, increasing the charging identification efficiency, reducing the error occurrence rate, and enhancing the reliability and safety.

Description of Reference Numerals

[0074] 101: On-vehicle charger, 102: Wake-up auxiliary circuit, 103: Battery management system, 104: Vehicle connection part, 105: Battery pack, 1041: AC charging vehicle connection part, 1042: DC charging vehicle connection part, 106: High-voltage distribution box, 107: Vehicle controller, 10: Vehicle.

Claims

1. A charging system for use in a vehicle (10), comprising: The present invention includes an in-vehicle charger (101), a wake-up auxiliary circuit (102), and a battery management system (103), The vehicle-mounted charger (101) is provided with a charging input port and a charging output port, the wake-up auxiliary circuit (102) includes a first diode (D1) and a second diode (D2), the positive terminal of the first diode (D1) is electrically connected to the charging output port, the positive terminal of the second diode (D2) is electrically connected to a DC charging vehicle connection (1042), and the negative terminal of the first diode (D1) and the negative terminal of the second diode (D2) are electrically connected to the same port of the battery management system (103); the first diode (D1) is configured to transmit an AC charging wake-up signal transmitted from an AC charging station, and the AC charging wake-up signal is configured to wake up the battery management system (103) during AC charging; the second diode (D2) is configured to transmit a DC charging wake-up signal transmitted from a DC charging station, and the DC charging wake-up signal is configured to wake up the battery management system (103) during DC charging; A charging system characterized by:

2. the vehicle (10) further includes a vehicle connection portion (104) and a third diode (D3), the vehicle connection portion (104) includes a control guide pin, the control guide pin is configured to transmit a control guide signal transmitted from the DC charging station or the AC charging station, the positive electrode of the third diode (D3) is electrically connected to the control guide pin, and the negative electrode of the third diode (D3) is electrically connected to the battery management system (103).

2. The charging system according to claim 1 .

3. the vehicle connection portion (104) further includes a ground pin (PE), the ground pin (PE) is grounded, the vehicle (10) further includes a first resistor (R1), a second resistor (R2) and a first switch (S1); A first end of the first resistor (R1) is electrically connected to the negative terminal of the third diode (D3), and a second end of the first resistor (R1) is electrically connected to the ground pin (PE); A first end of the second resistor (R2) is electrically connected to the negative electrode of the third diode (D3), and a second end of the second resistor (R2) is electrically connected to a first end of a first switch (S1); a second end of the first switch (S1) electrically connected to the ground pin (PE), and a third end of the first switch (S1) electrically connected to the battery management system (103); 3. The charging system according to claim 2.

4. Further including a charging station; the charging stand includes a power supply control device, a second switch, and a third resistor; The power supply control device is provided with a power supply output terminal, a power supply ground terminal, a detection terminal, and a control signal output terminal, the power supply output terminal is electrically connected to the battery management system (103), and the power supply ground terminal is grounded; a first end of the second switch is electrically connected to the control signal output end or the power supply output end, and a second end of the second switch is electrically connected to a first end of a third resistor; a second end of the third resistor is electrically connected to the control guide pin and the detection end; 4. The charging system according to claim 3.

5. the vehicle connection portion (104) further includes a charging connection confirmation pin, the charging connection confirmation pin is configured to transmit a charging connection confirmation signal, the charging stand further includes a fourth resistor, a first end of the fourth resistor is electrically connected to the charging connection confirmation pin, and a second end of the fourth resistor is grounded.

5. The charging system according to claim 1, wherein the charging device is a power source.

6. Further including a charging station; the charging stand includes a DC charging stand and an AC charging stand, the vehicle connection unit (104) includes a DC charging vehicle connection unit (1042) and an AC charging vehicle connection unit (1041), the DC charging vehicle connection unit (1042) is electrically connected to the DC charging stand, the AC charging vehicle connection unit (1041) is electrically connected to the AC charging stand, and the charging input port is electrically connected to the AC charging vehicle connection unit (1041); 5. The charging system according to claim 1, wherein the charging device is a power source.

7. A charging control method applied to the charging system according to claim 1, Obtaining a wake-up signal and a message signal, the wake-up signal being a DC charging wake-up signal or an AC charging wake-up signal, and the message signal being a DC fast charging mode message signal or an AC slow charging mode message signal; waking up a battery management system based on the wake-up signal; Initiating a target charging mode corresponding to the message signal based on the message signal; charging the vehicle in the target charge mode. A charging control method comprising:

8. the target charging mode includes an AC slow charging mode; Charging the vehicle in the target charge mode includes: When the target charging mode is an AC slow charging mode, acquiring a voltage signal at a first detection point; determining whether the voltage signal at the first detection point is a pulse width modulated signal having a first predetermined amplitude; charging the vehicle when the voltage signal at the first detection point is a pulse width modulated signal of a first predetermined amplitude.

8. The charge control method according to claim 7.

9. charging the vehicle when the voltage signal at the first detection point is a pulse width modulated signal having a first predetermined amplitude; closing a first switch when the voltage signal at the first detection point is a pulse width modulated signal of a first predetermined amplitude; detecting whether the voltage signal at the first detection point is a pulse width modulated signal having a second predetermined amplitude, and charging the vehicle when the voltage signal at the first detection point is a pulse width modulated signal having a second predetermined amplitude.

9. The charge control method according to claim 8.

10. charging the vehicle when the voltage signal at the first detection point is a pulse width modulated signal having a second predetermined amplitude; Obtaining a cable rated power capacity of the charging station corresponding to a resistance value of the fourth resistor; determining a first maximum charging current for the charging station based on the cable rated power capacity; Obtaining duty ratio information of a pulse width modulated signal having a second predetermined amplitude; determining a second maximum charging current of the charging station based on the duty ratio information; determining a target charging current based on the first maximum charging current and the second maximum charging current, and charging the vehicle with the target charging current.

10. The charge control method according to claim 9.

11. determining a target charging current based on the first maximum charging current and the second maximum charging current, and charging the vehicle at the target charging current, comparing the first maximum charging current to the second maximum charging current; charging the vehicle using the second maximum charging current as a target charging current when the first maximum charging current is greater than the second maximum charging current, and charging the vehicle using the first maximum charging current as a target charging current when the first maximum charging current is equal to or less than the second maximum charging current. The charge control method according to claim 10 .

12. A vehicle, The charging system according to claim 1, A vehicle characterized by:

13. A vehicle, 8. A charging control method according to claim 7, A vehicle characterized by:

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