Vehicle-mounted power supply device, vehicle and vehicle power shortage starting system and method

Abstract

The invention relates to a vehicle-mounted power supply device, a vehicle and a vehicle power shortage starting system and method. The vehicle controller is electrically connected with the storage battery and used for detecting the voltage value of the storage battery and judging whether the storage battery is in a power-lack state or not according to the detected voltage value; the vehicle interface is arranged on a vehicle so as to realize electrical connection between the vehicle-mounted charger and external charging equipment; the input end of the vehicle-mounted charger is connected with the vehicle interface; the input end of the direct-current converter is connected with the output end of the vehicle-mounted charger, and the output end of the direct-current converter is connected with the storage battery; when the vehicle controller detects that the external charging device is connected with the vehicle and the storage battery is in a power-lack state, the external charging device is allowed to charge the storage battery through the vehicle-mounted charger and the direct-current converter. The problem that the vehicle cannot be started due to the fact that the storage battery is lack of electricity is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile battery management, and in particular to an on-board power supply device, a vehicle, and a vehicle power-loss starting system and method. Background Art

[0002] With the rapid development of the automotive industry, especially the continuous breakthroughs in electric vehicle technology, the level of vehicle intelligence has been significantly improved. This progress is inseparable from the application of a large number of low-voltage sensors and controllers, which work together to achieve intelligent management and control of vehicles. However, the normal operation of these low-voltage components is highly dependent on a stable power supply, usually provided by lead-acid batteries.

[0003] During the normal operation of electric vehicles, lead-acid batteries not only provide power for the entire vehicle when it is started, but also ensure that all system components can work normally before the vehicle completes high-voltage power-up. However, in actual use, due to various reasons, such as low-voltage electrical appliances not being turned off, controllers not entering sleep mode, or vehicles being parked for a long time, the power of lead-acid batteries may be gradually consumed. When the lead-acid battery voltage is too low, it will not be able to provide enough power for the entire vehicle system, resulting in the vehicle being unable to start normally, causing great inconvenience to the owner.

[0004] The industry has proposed some solutions to this problem. For example, one solution provides a method of using the auxiliary power supply of a DC charging pile to power the vehicle controller. However, this method is limited by the installation location of the DC charging pile and the parking time of the vehicle, because it is relatively rare for the lead-acid battery to be depleted when the vehicle is parked at the DC charging pile.

[0005] Another solution proposes a method of providing AC power to the vehicle by closing a switch through a specific signal when the vehicle detects that the lead-acid battery is low on power. However, this method relies on the lead-acid battery low-power detection and controller operation on the vehicle side. If the lead-acid battery voltage has dropped below the operating voltage of the vehicle controller, the function will not be activated, thus limiting its practical application effect.

[0006] In addition, there is a solution that proposes an electric vehicle power shortage rescue system based on an AC charging pile. The system wakes up the integrated power battery unit through the voltage of the AC charging gun, and then obtains power from the AC charging pile. However, this solution also has limitations, that is, when the lead-acid battery voltage is too low to support the normal operation of the controller, voltage detection and switch control cannot be achieved, which may cause the vehicle to fail to start.

[0007] In summary, the existing technology still has obvious shortcomings in solving the problem of electric vehicles being unable to start due to low power in the lead-acid battery. On the one hand, although DC charging can provide external power, it is limited by the site and vehicle parking time, and the actual application scenarios are limited; on the other hand, the working voltage of the vehicle controller is around 9-16V. When the lead-acid battery is exhausted or even the voltage is close to 0V, the vehicle controller cannot work normally, and the vehicle-side lead-acid battery low power detection and S2 switch closing control cannot be realized, and the AC charging pile cannot provide power.

[0008] Therefore, it is necessary to develop a new vehicle-mounted power supply device, vehicle, vehicle power-loss starting system and method. Summary of the invention

[0009] The object of the present invention is to provide a vehicle-mounted power supply device, a vehicle, a vehicle low-power starting system and a method, which can solve the problem that the vehicle cannot be started due to low battery power.

[0010] In a first aspect, a vehicle-mounted power supply device according to the present invention comprises: Batteries; The vehicle controller is electrically connected to the battery and is used to detect the voltage value of the battery and determine whether the battery is in a low-power state according to the detected voltage value; The vehicle interface is used to match the charging gun of the external charging device to achieve the electrical connection between the vehicle charger and the external charging device; An on-board charger, whose input terminal is connected to the vehicle interface and is used to convert the AC power provided by the external charging device into DC power; A DC converter, whose input end is connected to the output end of the on-board charger, and whose output end is connected to the battery, is used to convert the DC power output by the on-board charger into a voltage and current suitable for charging the battery; The vehicle controller detects that the external charging device is connected to the vehicle interface and the battery is in a low-power state, and allows the external charging device to charge the battery through the on-board charger and the DC converter.

[0011] Optionally, the vehicle controller is further provided with a PWM wave generating unit. When the battery is detected to be low-power, the PWM wave generating unit sends a preset PWM signal to an external charging device through a CC line to indicate the low-power state of the battery. When the vehicle controller detects that the battery is low-power, the PWM wave generating unit can send a preset PWM signal to an external charging device through a CC line. This signal transmission method is efficient and stable, and can quickly and accurately convey the low-power state of the battery to the external charging device, thereby triggering a response mechanism for the external charging device to power or charge the vehicle.

[0012] Optionally, the vehicle controller is connected to the CP line through a switch K3. When it is detected that the external charging device is connected to the vehicle interface and the switch K3 is in a closed state, the external charging device is allowed to directly power the vehicle controller through the CP line. By setting the switch K3 in the CP line, the vehicle controller can more flexibly control the on and off of the CP line. When the switching power supply of the external charging device is required to power the vehicle controller, the switch K3 is controlled to be closed. When the switching power supply of the external charging device is not required to power the vehicle, the switch K3 can be disconnected.

[0013] In a second aspect, a vehicle comprises: Vehicle body; The vehicle-mounted power supply device of the present invention is arranged on the vehicle body.

[0014] In a third aspect, a vehicle low-power starting system according to the present invention comprises: A vehicle according to the present invention; An external charging device, comprising a charging gun and a device controller, wherein the charging gun matches the vehicle interface of the vehicle for connection, and the device controller is connected to the CC terminal of the charging gun; Among them, after the vehicle is connected to the external charging device, the vehicle's on-board power supply device is used to send a low-power status signal to the external charging device through the CC line when it is determined that the battery is in a low-power state. After the device controller detects the low-power status signal, it supplies power to the vehicle through the external charging device and charges the battery.

[0015] Optionally, the external charging device further includes a switching power supply, which is connected to the CP end of the charging gun through a switch K2, and is used for supplying power to the vehicle controller in the vehicle-mounted power supply device through the CP line after the charging gun is connected to the vehicle interface and started. After the charging gun is connected to the vehicle interface of the vehicle and the charging process is started, the switching power supply of the external charging device can provide the necessary power supply to the vehicle controller through the CP line. This design effectively solves the problem that when the battery power is completely consumed or even the voltage is close to 0V, the vehicle controller cannot work due to failure to supply power normally. In this case, the traditional battery power-loss detection mechanism and the closing control of the switch S2 (see GB / T 18487.1-2023) will not be realized, resulting in the AC charging pile being unable to provide the required power to the vehicle. By introducing a switching power supply and supplying power to the vehicle controller through the CP line, the present invention ensures that the vehicle controller can work normally even when the battery is completely exhausted, thereby smoothly realizing battery power-loss detection, switch control, and power supply of the AC charging pile.

[0016] Optionally, the external charging device is an AC charging pile, which is suitable for application scenarios where the parking space ratio of AC charging piles for electric vehicles is high and the battery voltage is low when the vehicle is parked for a long time.

[0017] In a fourth aspect, a method for starting a vehicle with low battery power according to the present invention adopts the vehicle starting system with low battery power according to the present invention, and the method comprises the following steps: The external charging device is connected to the vehicle via a charging gun; The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power; If the voltage value of the battery is less than or equal to the first preset threshold value, it indicates that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device; After receiving the low-power status signal, the external charging device provides power to the vehicle; The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

[0018] In a fifth aspect, a method for starting a vehicle with low battery power according to the present invention adopts the vehicle starting system with low battery power according to the present invention, and the method comprises the following steps: After the external charging device is connected to the vehicle through the charging gun, the switching power supply of the external charging device supplies power to the vehicle controller in the on-board power supply device through the CP line; The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power; If the voltage value of the battery is less than or equal to the first preset threshold value, it indicates that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device; After receiving the low-power status signal, the external charging device provides power to the vehicle; The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

[0019] Optionally, it also includes: When the vehicle controller detects that the voltage value of the battery is greater than the second preset threshold, the vehicle controller wakes up the low-voltage system of the vehicle and sends a battery charging mode signal to determine whether the high-voltage power-on condition is met. If so, the high-voltage power-on is completed; after the high-voltage power-on is completed, the circuit between the control switch power supply and the vehicle controller is disconnected; Determine whether the power battery needs to be charged; If the power battery has no charging demand and the battery charging mode sent by the vehicle controller is valid, the vehicle maintains the high-voltage power-on state, and the duration of the high-voltage power-on state is obtained according to the experimental calibration of the battery power-deficient voltage value. This step helps to wake up the low-voltage system of the vehicle in time and start the battery charging mode when the battery voltage recovers to a certain level. This not only ensures that the low-voltage system of the vehicle can operate normally when the power supply is sufficient, but also flexibly adjusts the charging strategy according to the degree of battery power deficiency to improve charging efficiency and battery life. In the battery charging mode, it is determined whether the power battery has a charging demand and the charging strategy can be flexibly adjusted according to the actual situation. If the power battery has no charging demand, the vehicle can maintain the high-voltage power-on state to supply power to the low-voltage system of the vehicle; if the power battery has a charging demand, the power battery can be charged first. This flexible charging strategy helps to improve charging efficiency and energy utilization.

[0020] Beneficial effects of the present invention: The vehicle-mounted power supply device, vehicle low-power starting system and method described in the present invention, wherein the vehicle-mounted power supply device contains a battery, a vehicle controller, an on-board charger, a DC converter and a vehicle interface. The vehicle controller intelligently detects the battery voltage, determines the low-power state, and is connected to the external charging device through the on-board charger and the DC converter to realize the conversion of AC power to DC power suitable for battery charging. When the battery is low-power and meets the charging conditions, the vehicle controller allows the external charging device to charge the battery, which effectively solves the problem that the vehicle cannot be started due to low-power battery. In addition, a switching power supply is provided in the external charging device. After the charging gun is connected to the vehicle, the vehicle controller can be powered directly through the switching power supply, thereby solving the problem that when the battery power is completely consumed or even the voltage is close to 0V, the vehicle controller cannot work due to failure to power supply normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a functional block diagram of the vehicle low-power starting system described in the embodiment of the present application; Figure 2 This is a flow chart of the vehicle power-down starting method described in Example 1 of the present application; Figure 3 This is a flow chart of the vehicle power-down starting method described in Embodiment 2 of the present application; Figure 4 This is a detailed flow chart of the vehicle low-power starting method described in the embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] Embodiment 1 like Figure 1 As shown, a vehicle-mounted power supply device includes a battery, a vehicle controller, an on-board charger, a DC converter and a vehicle interface. The vehicle controller is electrically connected to the battery, and is used to detect the voltage value of the battery, and judge whether the battery is in a low-power state according to the detected voltage value. The vehicle interface is used to match the charging gun of an external charging device to realize the electrical connection between the on-board charger and the external charging device. The input end of the on-board charger is connected to the vehicle interface, and is used to convert the AC power provided by the external charging device into DC power. The input end of the DC converter is connected to the output end of the on-board charger, and the output end of the DC converter is connected to the battery, and is used to convert the DC power output by the on-board charger into a voltage and current suitable for charging the battery. Among them, the vehicle controller detects that the external charging device is connected to the vehicle interface and the battery is in a low-power state, and allows the external charging device to charge the battery through the on-board charger and the DC converter.

[0025] like Figure 1 As shown, in a possible embodiment, a vehicle-mounted power supply device further includes a switch S2, a resistor R2 and a resistor R3, wherein one end of the switch S2 is connected to the PE line, the other end of the switch S2 is connected to the CP end of the vehicle interface via the resistor R2 and the diode D1, one end of the resistor R3 is connected to the PE line, and the other end of the resistor R3 is connected to the connection point of the resistor R2 and the negative electrode of the diode D1.

[0026] like Figure 1 As shown, in a possible embodiment, the vehicle controller is connected to the CC end of the vehicle interface, and the connection point between the vehicle controller and the CC end of the vehicle interface is set as detection point three.

[0027] like Figure 1As shown, in a possible embodiment, the vehicle controller is connected to the CP line through a switch K3. When it is detected that the external charging device is connected to the vehicle and the switch K3 is in a closed state, the external charging device is allowed to directly power the vehicle controller through the CP line. By setting the switch K3 in the CP line, the vehicle controller can more flexibly control the on and off of the CP line. When the switching power supply of the external charging device is required to power the vehicle controller, the switch K3 is controlled to be closed. When the switching power supply of the external charging device is not required to power the vehicle, the switch K3 can be disconnected. The connection point of the switch K3 and the diode D1 is set as the detection point 2.

[0028] like Figure 1 As shown, in a possible embodiment, the vehicle controller is further provided with a PWM wave generating unit. When the battery is detected to be low-power, the PWM wave generating unit sends a preset PWM signal to the external charging device through the CC line to indicate the low-power state of the battery. When the vehicle controller detects that the battery is low-power, the PWM wave generating unit can send a preset PWM signal to the external charging device through the CC line. This signal transmission method is efficient and stable, and can quickly and accurately convey the low-power state of the battery to the external charging device, thereby triggering the response mechanism of the external charging device to power or charge the vehicle.

[0029] like Figure 1 As shown, in a possible embodiment, the vehicle interface further includes a resistor R4, a resistor RC and a switch S3, and one end of the resistor R4 connected in parallel with the switch S3 is connected to the PE line, and the other end is connected to the CC line.

[0030] like Figure 1 As shown, in a possible embodiment, a fuse F1 is further provided on the line connecting the vehicle controller and the battery.

[0031] In an embodiment of the present application, a vehicle includes a vehicle body and a vehicle-mounted power supply device as in the first embodiment, which is arranged on the vehicle body.

[0032] like Figure 1 As shown, a vehicle low-power starting system includes a vehicle and an external charging device as in the first embodiment. The external charging device includes a charging gun and a device controller, the charging gun matches the vehicle interface of the vehicle for connection, and the device controller is connected to the CC end of the charging gun. The connection point between the device controller and the CC end of the charging gun is set as detection point four. Among them, after the vehicle is connected to the external charging device, the on-board power supply device is used to send a low-power status signal to the external charging device through the CC line when it is determined that the battery is low-power. After the device controller detects the low-power status signal, it supplies power to the vehicle through the external charging device and charges the battery.

[0033] like Figure 1 As shown, in a possible embodiment, the external charging device is an AC charging pile. It meets the application scenarios where the parking space ratio of AC charging piles for electric vehicles is high and the battery voltage is low when the vehicle is parked for a long time. Among them, the device controller is connected to the CP end of the charging gun through switch K1 and resistor R1 in sequence. The connection point between resistor R1 and the CP end of the charging gun is set to detection point 1. The device controller is also directly connected to detection point 1.

[0034] like Figure 2 As shown, a method for starting a vehicle with low battery power adopts the vehicle starting system with low battery power as in the first embodiment, and the method comprises the following steps: The external charging device is connected to the vehicle via a charging gun.

[0035] The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power.

[0036] If the voltage value of the battery is less than or equal to the first preset threshold value, it means that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device.

[0037] After receiving the low-power status signal, the external charging device provides power to the vehicle.

[0038] The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

[0039] Embodiment 2 like Figure 1 As shown, a vehicle power-down starting system, wherein the external charging device also includes a switching power supply, which is connected to the CP end of the charging gun through a switch K2, and is used to supply power to the vehicle controller in the vehicle power supply device through the CP line after the charging gun is connected to the vehicle interface and started. After the charging gun is connected to the vehicle interface of the vehicle and the charging process is started, the switching power supply of the external charging device can provide the necessary power supply to the vehicle controller through the CP line. This design effectively solves the problem that when the battery power is completely consumed or even the voltage is close to 0V, the vehicle controller cannot work due to failure to supply power normally. In this case, the traditional battery power-down detection mechanism and the closing control of the switch S2 (see GB / T 18487.1-2023) will not be realized, resulting in the AC charging pile being unable to provide the required power for the vehicle. By introducing a switching power supply and supplying power through the CP line, the present invention ensures that the vehicle controller can work normally even when the battery is completely exhausted, thereby smoothly realizing battery power-down detection, switch control and power supply of the AC charging pile.

[0040] The rest is the same as that of the first embodiment.

[0041] like Figure 3 As shown, a method for starting a vehicle with low battery power adopts the vehicle starting system with low battery power as in the second embodiment, and the method comprises the following steps: After the external charging device is connected to the vehicle through the charging gun, the switching power supply of the external charging device supplies power to the vehicle controller in the on-board power supply device through the CP line.

[0042] The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power.

[0043] If the voltage value of the battery is less than or equal to the first preset threshold value, it means that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device.

[0044] After receiving the low-power status signal, the external charging device provides power to the vehicle.

[0045] The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

[0046] In a possible embodiment, a method for starting a vehicle with low power also includes: When the vehicle controller detects that the voltage value of the battery is greater than the second preset threshold, the vehicle controller wakes up the low-voltage system of the vehicle and sends a battery charging mode signal to determine whether the high-voltage power-on condition is met. If it is met, the high-voltage power-on is completed; after the high-voltage power-on is completed, the circuit between the control switch power supply and the vehicle controller is disconnected. It is determined whether the power battery has a charging demand. If the power battery has no charging demand and the battery charging mode sent by the vehicle controller is valid, the vehicle maintains the high-voltage power-on state, and the duration of the high-voltage power-on state is obtained according to the experimental calibration of the battery power-loss voltage value. This step helps to wake up the low-voltage system of the vehicle in time and start the battery charging mode when the battery voltage recovers to a certain level. This can not only ensure that the vehicle can operate normally when the low-voltage system is fully powered, but also flexibly adjust the charging strategy according to the degree of battery power loss to improve charging efficiency and battery life. In the battery charging mode, it is determined whether the power battery has a charging demand and the charging strategy can be flexibly adjusted according to the actual situation. If the power battery has no charging demand, the vehicle can maintain the high-voltage power-on state to supply power to the low-voltage system of the vehicle; if the power battery has a charging demand, the power battery can be charged first. This flexible charging strategy helps improve charging efficiency and energy utilization.

[0047] like Figure 4 As shown, the following takes the vehicle controller as a battery management controller (BMS), the battery as a lead-acid battery, and the external charging device as an AC charging pile as an example to explain the vehicle low-power starting system: The vehicle power-down starting system provides a 12V power supply to the battery management controller through the CP line of the AC charging pile. At this time, the battery management controller can detect the voltage value of the lead-acid battery. If the voltage value of the lead-acid battery is less than or equal to the first preset threshold value (for example: 11.5V, which is determined according to the lead-acid battery selection), the battery management controller outputs a preset PWM signal (for example: a PWM signal with a voltage of V2 and a duty cycle of 10%) through the PWM wave generating unit, and sends a power-down status signal to the AC charging pile through the CC line. The device controller in the AC charging pile detects the power-down status signal and determines to provide 220V AC power to the on-board charger. The on-board charger starts to output DC voltage to the DC converter. The DC converter starts to output 14.5V DC voltage to power the vehicle's low-voltage system. After the vehicle is started, the battery management controller determines whether to enter the charging mode or the lead-acid battery charging mode according to the power of the power battery. The system and method solve the problem that the vehicle cannot be started due to power loss of the lead-acid battery.

[0048] like Figure 4 As shown, the working process of the vehicle's low-power starting system is described in detail below: (1) The vehicle controller is awakened After the AC charging gun is connected to the vehicle and the AC charging pile is started, the AC charging pile provides 12V power to the battery management controller through the CP line. At this time, the switch K2 of the AC charging pile and the switch K3 of the vehicle are both in the closed state.

[0049] (2) The vehicle is started without running out of power After the battery management controller is initialized, the voltage of the lead-acid battery is detected. If the voltage of the lead-acid battery is greater than the first preset threshold, the battery management controller controls the voltage at detection point three to be the continuous voltage of V1, and then disconnects the vehicle's switch K3; the equipment controller of the AC charging pile detects the continuous voltage of V1 through monitoring point four, controls switch K2 to disconnect and switch K1 to close, and the system enters the conventional AC charging judgment mode.

[0050] (3) Vehicle starting process with low battery After the battery management controller is initialized, if the voltage of the lead-acid battery is detected to be ≤11.5V, the battery management controller controls the PWM generating unit to output a PWM signal (for example, a PWM signal with a voltage of V2 and a duty cycle of 10%), that is, the detection point 3 is a PWM signal; at this time, the device controller of the AC charging pile detects the PWM signal through the detection point 4, that is, it recognizes that the lead-acid battery of the vehicle is low on power. At this time, the switch K2 is kept closed, the switch K1 is opened, and the switch C1 (the switch that controls the closing and opening of the live line) and the switch C2 (the switch that controls the closing and opening of the neutral line) are closed to provide 220V power for the vehicle. The on-board charger receives the 220V power supply, completes the initialization, and outputs the voltage according to the current voltage value of the power battery sent by the battery management controller as the DC voltage output target value. The DC converter converts the DC power output by the on-board charger into a low-voltage DC power of 14.5V to power the low-voltage system of the vehicle and charge the lead-acid battery at the same time.

[0051] When the voltage of the lead-acid battery is greater than the second preset threshold (for example: 12.5V, the second preset threshold is determined according to the selection of the lead-acid battery), the battery management controller wakes up the low-voltage system of the vehicle through the CAN management message, and sends the lead-acid battery charging mode signal to the vehicle controller. If the high-voltage power-on condition is met, the battery management controller closes the main positive and negative relays of the power battery pack to complete the high-voltage power-on; at this time, the battery management controller controls the voltage of detection point three to remain at V1, and disconnects switch K3. At the same time, the device controller of the AC charging pile closes switch K1 and disconnects switch K2. At the same time, switches C1 and C2 are controlled to be closed or disconnected according to the state of switch S2, specifically: If the switch S2 is closed, it means that the power battery needs to be charged, and then the AC charging mode is entered.

[0052] If the state of switch S2 is disconnected, indicating that the power battery has no need to charge, the switches C1 and C2 of the AC charging pile are controlled to be disconnected. If the low-voltage charging mode of the lead-acid battery sent by the battery management controller is valid, the vehicle maintains the high-voltage power-on state (the power battery supplies power to the lead-acid battery at this time), and the duration is obtained by referring to the experimental calibration of the lead-acid battery voltage value. After the battery is charged, the battery management controller sends a charging completion signal to the external charging device and / or other control systems of the vehicle through the CC line.

[0053] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A vehicle-mounted power supply device, characterized in that: include: Batteries; The vehicle controller is electrically connected to the battery and is used to detect the voltage value of the battery and determine whether the battery is in a low-power state according to the detected voltage value; The vehicle interface is used to match the charging gun of the external charging device to achieve the electrical connection between the vehicle charger and the external charging device; An on-board charger, whose input terminal is connected to the vehicle interface and is used to convert the AC power provided by the external charging device into DC power; A DC converter, whose input end is connected to the output end of the on-board charger, and whose output end is connected to the battery, is used to convert the DC power output by the on-board charger into a voltage and current suitable for charging the battery; The vehicle controller detects that the external charging device is connected to the vehicle interface and the battery is in a low-power state, and allows the external charging device to charge the battery through the on-board charger and the DC converter.

2. The vehicle-mounted power supply device according to claim 1, characterized in that: The vehicle controller is also provided with a PWM wave generating unit. When it is detected that the battery is low on power, the PWM wave generating unit sends a preset PWM signal to an external charging device through a CC line to indicate the low-power state of the battery.

3. The vehicle-mounted power supply device according to claim 1, characterized in that: The vehicle controller is connected to the CP line through the switch K3. When it is detected that the external charging device is connected to the vehicle interface and the switch K3 is in a closed state, the external charging device is allowed to directly power the vehicle controller through the CP line.

4. A vehicle, characterized in that: include: Vehicle body; The vehicle-mounted power supply device as described in any one of claims 1 to 3 is arranged on the vehicle body.

5. A vehicle power-loss starting system, characterized in that: include: The vehicle as claimed in claim 4; An external charging device, comprising a charging gun and a device controller, wherein the charging gun matches the vehicle interface of the vehicle for connection, and the device controller is connected to the CC terminal of the charging gun; Among them, after the vehicle is connected to the external charging device, the vehicle's on-board power supply device is used to send a low-power status signal to the external charging device through the CC line when it is determined that the battery is in a low-power state. After the device controller detects the low-power status signal, it supplies power to the vehicle through the external charging device and charges the battery.

6. The vehicle power failure starting system according to claim 5, characterized in that: The external charging device also includes a switching power supply, which is connected to the CP end of the charging gun through a switch K2, and is used to supply power to the vehicle controller in the on-board power supply device through the CP line after the charging gun is connected to the vehicle interface and started.

7. The vehicle power failure starting system according to claim 5, characterized in that: The external charging device is an AC charging pile.

8. A method for starting a vehicle with low power, characterized in that: The vehicle low-power starting system as claimed in claim 5 or 7 is used, and the method comprises the following steps: The external charging device is connected to the vehicle via a charging gun; The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power; If the voltage value of the battery is less than or equal to the first preset threshold value, it indicates that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device; After receiving the low-power status signal, the external charging device provides power to the vehicle; The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

9. A method for starting a vehicle with low power, characterized in that: The vehicle low-power starting system as claimed in claim 6 or 7 is used, and the method comprises the following steps: After the external charging device is connected to the vehicle through the charging gun, the switching power supply of the external charging device supplies power to the vehicle controller in the on-board power supply device through the CP line; The vehicle controller detects the voltage value of the battery to determine whether the battery is low on power; If the voltage value of the battery is less than or equal to the first preset threshold value, it indicates that the battery is low on power, and the vehicle controller sends a low-power status signal to the external charging device; After receiving the low-power status signal, the external charging device provides power to the vehicle; The on-board charger and DC converter convert the electricity output by the external charging device into low-voltage DC power to power the vehicle's low-voltage system and charge the battery at the same time.

10. The vehicle power failure starting method according to claim 9, characterized in that: Also includes: When the vehicle controller detects that the voltage value of the battery is greater than the second preset threshold, the vehicle controller wakes up the low-voltage system of the vehicle and sends a battery charging mode signal to determine whether the high-voltage power-on condition is met. If so, the high-voltage power-on is completed; after the high-voltage power-on is completed, the circuit between the control switch power supply and the vehicle controller is disconnected; Determine whether the power battery needs to be charged; If the power battery has no charging demand and the battery charging mode sent by the vehicle controller is valid, the vehicle maintains a high-voltage power-on state, and the duration of the high-voltage power-on state is obtained according to the experimental calibration of the battery low-power voltage value.

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