Vehicle power supply system and vehicle

Abstract

The utility model discloses a vehicle power supply system and a vehicle. The vehicle power supply system comprises a main battery module, a redundant battery module, a power supply management module, a brake-by-wire system and an electronic parking brake system, the anode of the main battery module is connected with the first input end of the power supply management module, and the cathode is grounded; a first output end of the power supply management module is connected with the brake-by-wire system, and a second output end is connected with the electronic parking brake system; the positive electrode of the redundant battery module is connected with the third output end of the power supply management module, the negative electrode of the redundant battery module is grounded, the first output end of the redundant battery module is connected with the brake-by-wire system, the second output end of the redundant battery module is connected with the electronic parking brake system, and the third output end of the redundant battery module is connected with the first input end of the power supply management module. According to the technical scheme, the power supply requirement of the chassis system or the requirement that a user enters and starts the vehicle when the main battery module is insufficient in power can be met, and the problem that the user cannot use the vehicle when the main battery module is insufficient in power is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially, relate to a vehicle power supply system and vehicle. BACKGROUND

[0002] With the development of new energy vehicles, the driving safety of vehicles is more and more concerned by consumers. In order to improve the driving safety of vehicles, the existing vehicle power supply system generally adopts a dual power grid power supply scheme, that is, a main storage battery and a redundant battery are used to supply power to different vehicle electronic systems through two mutually isolated power supply circuits respectively, so as to ensure that the other power supply circuit can still support the braking of vehicle deceleration under the condition that one of the power supply circuits fails to supply power, and ensure that the electronic parking brake system can work normally after the vehicle is parked on the side. However, when the main storage battery fails, the redundant battery cannot supply power to the entire vehicle system, resulting in that the user cannot enter and start the vehicle. SUMMARY

[0003] The utility model embodiment provides a vehicle power supply system and vehicle to solve the problem that the existing vehicle power supply system cannot enter and start the vehicle when the main storage battery fails.

[0004] A vehicle power supply system, comprising a main battery module, a redundant battery module, a power supply management module, a line control braking system and an electronic parking brake system.

[0005] The positive electrode of the main battery module is connected with the first input end of the power supply management module, and the negative electrode of the main battery module is grounded.

[0006] The first output end of the power supply management module is connected with the line control braking system, and the second output end of the power supply management module is connected with the electronic parking brake system.

[0007] The positive electrode of the redundant battery module is connected with the third output end of the power supply management module, and the negative electrode of the redundant battery module is grounded. The first output end of the redundant battery module is connected with the line control braking system, the second output end of the redundant battery module is connected with the electronic parking brake system, and the third output end of the redundant battery module is connected with the first input end of the power supply management module.

[0008] Further, the power supply management module comprises a front cabin electrical box.

[0009] Further, the redundant battery module comprises a battery pack, a charging circuit, a first output circuit, a second output circuit, a third output circuit and a battery management module.

[0010] The charging circuit is connected with the battery pack and a third output end of the power supply management module, and is used for charging the battery pack.

[0011] The first output circuit is connected with the battery pack and a first input end of the power supply management module, and is used for supplying power to the power supply management module.

[0012] The second output circuit is connected with the battery pack and the line control brake system, and is used for supplying power to the line control brake system.

[0013] The third output circuit is connected with the battery pack and the electronic parking brake system, and is used for supplying power to the electronic parking brake system.

[0014] The battery management module is connected with the charging circuit, the first output circuit, the second output circuit and the third output circuit, and is used for controlling the first output circuit, the second output circuit and / or the third output circuit to be turned on when a preset power supply condition is met.

[0015] Further, the vehicle power supply system further comprises a trigger switch.

[0016] The battery management module is connected with the trigger switch, and is used for controlling the second output circuit and / or the third output circuit to be turned on when the main battery module is abnormal; and when the main battery module is abnormal and a trigger signal of the trigger switch is received, the battery management module is used for controlling the first output circuit to be turned on, or controlling the first output circuit, the second output circuit and / or the third output circuit to be turned on.

[0017] Further, the trigger switch is a tail door switch or a door handle switch of the vehicle.

[0018] Further, the battery management module comprises a controller and a first timer.

[0019] The first timer is connected with the controller, and is used for timing a trigger time of the trigger signal and outputting a first timing time.

[0020] The controller is connected with the charging circuit, the first output circuit and the second output circuit, and is used for controlling the first output circuit to be turned on, or controlling the first output circuit and the second output circuit to be turned on when the main battery module is abnormal and the first timing time meets a first preset time.

[0021] Further, the battery management module further comprises a second timer.

[0022] The second timer is used for timing a turn-on time of the first output circuit and outputting a second timing time.

[0023] The controller is further connected with the second timer, and is configured to control the first output circuit to be disconnected when the second timing time meets a second preset time.

[0024] Further, the vehicle power supply system further comprises a vehicle body electronic stability system connected with the power supply management module.

[0025] A vehicle comprises the vehicle power supply system.

[0026] The utility model embodiment provides vehicle power supply system and vehicle, vehicle power supply system includes main battery module, redundancy battery module, power supply management module, line control brake system and electronic parking brake system, the positive pole of main battery module is connected with the first input of power supply management module, the negative pole of main battery module is grounded, the first output of power supply management module is connected with line control brake system, the second output of power supply management module is connected with electronic parking brake system, the positive pole of redundancy battery module is connected with the third output of power supply management module, the negative pole of redundancy battery module is grounded, the first output of redundancy battery module is connected with line control brake system, the second output of redundancy battery module is connected with electronic parking brake system, the third output of redundancy battery module is connected with the first input of power supply management module, thereby when main battery module is short of electricity, supplies power to power supply management module, line control brake system and / or electronic parking brake system through redundancy battery module, to meet chassis system power supply demand when main battery module is short of electricity, or the demand of user entering vehicle and starting vehicle, thereby solve the problem that user cannot use vehicle when main battery module is short of electricity. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced the drawings needed to be used in the description of the utility model embodiment, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to these drawings.

[0028] Fig. 1 It is a schematic diagram of the power supply system in an embodiment of the utility model;

[0029] Fig. 2 It is another schematic diagram of the power supply system in an embodiment of the utility model;

[0030] Fig. 3 It is another schematic diagram of the power supply system in an embodiment of the utility model.

[0031] In the figure: 1, main battery module; 2, redundant battery module; 21, battery pack; 22, charging loop; 23, first output loop; 24, second output loop; 25, third output loop; 26, battery management module; 3, power supply management module; 41, line control brake system; 42, electronic parking brake system; 43, vehicle body electronic stability system; 5, trigger switch. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] It should be understood that the present application can be implemented in different forms and should not be interpreted as being limited to the embodiments presented herein. On the contrary, these embodiments are presented so that the disclosure will be complete and full and will fully convey the scope of the present application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions can be exaggerated for clarity throughout the drawings the same reference numbers represent the same elements.

[0034] It should be understood that when an element or layer is referred to as being "on", "adjacent", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to", or "directly coupled to" another element or layer, then there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0035] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0037] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0038] This embodiment provides a vehicle power supply system, applied in a vehicle, such as... Fig. 1 As shown, the system includes a main battery module 1, a redundant battery module 2, a power management module 3, a brake-by-wire system 41, and an electronic parking brake system 42. The positive terminal of the main battery module 1 is connected to the first input terminal of the power management module 3, and the negative terminal of the main battery module 1 is grounded. The first output terminal of the power management module 3 is connected to the brake-by-wire system 41, and the second output terminal of the power management module 3 is connected to the electronic parking brake system 42. The positive terminal of the redundant battery module 2 is connected to the third output terminal of the power management module 3, and the negative terminal of the redundant battery module 2 is grounded. The first output terminal of the redundant battery module 2 is connected to the brake-by-wire system 41, the second output terminal of the redundant battery module 2 is connected to the electronic parking brake system 42, and the third output terminal of the redundant battery module 2 is connected to the first input terminal of the power management module 3.

[0039] As an example, the main battery module 1 comprises a storage battery. The storage battery can be charged by an external power source outside the vehicle, or by the power battery of the vehicle.

[0040] As an example, the positive pole of the main battery module 1 is connected to the first input terminal of the power supply management module 3, and the negative pole of the main battery module 1 is grounded, for providing a first power supply signal to the power supply management module 3; the power supply management module 3 is connected to the main battery module 1, and is used for connecting vehicle loads, for outputting a second power supply signal to the vehicle loads according to the first power supply signal. As an example, the vehicle loads are electronic systems in the vehicle, including a brake-by-wire system 41, an electronic parking brake system 42, or a vehicle body electronic stability system 43. The first output terminal of the power supply management module 3 is connected to the brake-by-wire system 41, the second output terminal of the power supply management module 3 is connected to the electronic parking brake system 42, and the fourth output terminal of the power supply management module 3 is connected to the vehicle body electronic stability system 43. In this example, the power supply management module 3 manages the power supply provided by the main battery module 1 according to the first power supply signal, and outputs the power supply to the brake-by-wire system 41, the electronic parking brake system 42, and the vehicle body electronic stability system 43, for powering the brake-by-wire system 41, the electronic parking brake system 42, and the vehicle body electronic stability system 43. It can be understood that other electronic systems in the vehicle can be connected to the power supply management module 3 according to actual needs, which is not limited herein.

[0041] As an example, the positive pole of the redundant battery module 2 is connected with the third output end of the power supply management module 3, the negative pole of the redundant battery module 2 is grounded, the first output end of the redundant battery module 2 is connected with the line control brake system 41, the second output end of the redundant battery module 2 is connected with the electronic parking brake system 42, and the third output end of the redundant battery module 2 is connected with the first input end of the power supply management module 3, so as to supply power to the power supply management module 3, the line control brake system 41 and / or the electronic parking brake system 42 when the preset power supply condition is met. The preset power supply condition is the condition for the redundant battery module 2 to start supplying power. As an example, the preset power supply condition includes that the main battery module 1 is in a power shortage. As an example, the redundant battery module 2 obtains the first voltage of the main battery module 1 according to the electrical signal output by the power supply management module 3, and determines whether the main battery module 1 is in a power shortage according to the first voltage of the main battery module 1. As an example, if the first voltage of the main battery module 1 is less than 9 volts and the duration is greater than 1 minute, it is determined that the main battery module 1 is in a power shortage. When it is determined that the main battery module 1 is in a power shortage, the redundant battery module 2 starts to supply power to the line control brake system 41 and the electronic parking brake system 42 to meet the power supply demand of the chassis system. As an example, the preset power supply condition further includes that the main battery module 1 is in a power shortage and the user's demand to start the vehicle is detected. As an example, when the redundant battery module 2 determines that the main battery module 1 is in a power shortage according to the first voltage of the main battery module 1 and detects the user's demand to start the vehicle, power is supplied to the power supply management module 3 to make the power supply management module 3 supply power to the electronic system of the whole vehicle, so as to meet the user's demand to enter and start the vehicle, thereby solving the problem that the user cannot use the vehicle when the main battery module 1 is in a power shortage. It can be understood that when the main battery module 1 is in a power shortage and the user's demand to start the vehicle is detected, the redundant battery module 2 can supply power to the power supply management module 3 alone or supply power to the power supply management module 3, the line control brake system 41 and the electronic parking brake system 42 at the same time.

[0042] Further, the preset power supply condition further includes that the main battery module 1 is in a power shortage, the user's demand to start the vehicle is detected, and the amount of electricity stored in the redundant battery module 2 is greater than a first preset amount of electricity. As an example, the first preset amount of electricity is 20%.

[0043] As an example, when the main battery module 1 does not appear to be in a power shortage, the main battery module 1 can charge the redundant battery module 2 through the power supply management module 3. It should be noted that, in order to avoid the case of reverse output, the redundant battery module 2 adopts a one-way charging design, that is, it is only charged by the main battery module 1 and will not be discharged to the main battery module 1.

[0044] Further, in order to prevent the stored power of the redundant battery module 2 from decreasing too much, when the redundant battery module 2 meets a first power-off condition, the power supply to the power supply management module 3 is stopped, and only the power supply to the line control braking system 41 and the electronic parking brake system 42 is maintained. The first power-off condition includes that the power supply time to the power supply management module 3 is greater than a second preset time, the first voltage of the main battery module 1 is greater than 13 volts and the duration is greater than 5 seconds, and / or the stored power of the redundant battery module 2 is less than a second preset power. Exemplarily, the second preset power is 15%.

[0045] In the embodiment, the vehicle power supply system includes the main battery module 1, the redundant battery module 2, the power supply management module 3, the line control braking system 41 and the electronic parking brake system 42; the positive electrode of the main battery module 1 is connected to the first input end of the power supply management module 3, and the negative electrode of the main battery module 1 is grounded; the first output end of the power supply management module 3 is connected to the line control braking system 41, and the second output end of the power supply management module 3 is connected to the electronic parking brake system 42; the positive electrode of the redundant battery module 2 is connected to the third output end of the power supply management module 3, the negative electrode of the redundant battery module 2 is grounded, the first output end of the redundant battery module 2 is connected to the line control braking system 41, the second output end of the redundant battery module 2 is connected to the electronic parking brake system 42, and the third output end of the redundant battery module 2 is connected to the first input end of the power supply management module 3, so that when the main battery module 1 is in power loss, the power supply management module 3, the line control braking system 41 and / or the electronic parking brake system 42 are powered by the redundant battery module 2 to meet the chassis system power supply demand or the user's demand to enter and start the vehicle when the main battery module 1 is in power loss, thereby solving the problem that the user cannot use the vehicle when the main battery module 1 is in power loss.

[0046] In an embodiment, the power supply management module 3 includes a front compartment electrical box. In the embodiment, the main battery module 1 and the target load 4 are connected through the front compartment electrical box to distribute power to the target load 4 and protect the target load 4, ensuring the normal operation and safety of the vehicle electrical system.

[0047] In an embodiment, as Fig. 2As shown, the redundant battery module 2 comprises a battery pack 21, a charging circuit 22, a first output circuit 23, a second output circuit 24, a third output circuit 25 and a battery management module 26; the charging circuit 22 is connected with the battery pack 21 and the power supply management module 3, and is used for charging the battery pack 21; the first output circuit 23 is connected with the battery pack 21 and the power supply management module 3, and is used for supplying power to the power supply management module 3; the second output circuit 24 is connected with the battery pack 21 and the line control brake system 41, and is used for supplying power to the line control brake system 41; the third output circuit 25 is connected with the battery pack 21 and the electronic parking brake system 42, and is used for supplying power to the electronic parking brake system 42; the battery management module 26 is connected with the charging circuit 22, the first output circuit 23, the second output circuit 24 and the third output circuit 25, and is used for controlling the first output circuit 23, the second output circuit 24 and / or the third output circuit 25 to be turned on when a preset power supply condition is met.

[0048] Exemplarily, the charging circuit 22, the first output circuit 23, the second output circuit 24 and the third output circuit 25 each comprise a voltage conversion circuit and a circuit control switch. The voltage conversion circuit is used for converting a charging voltage or an output voltage. The circuit control switch is used for controlling the corresponding charging circuit 22, the first output circuit 23, the second output circuit 24 and the third output circuit 25 to be turned on or turned off.

[0049] In the embodiment, the redundant battery module 2 charges the battery pack 21 through the main battery module 1, the power supply management module 3 and the charging circuit 22, judges that the main battery module 1 is in power shortage when a preset power supply condition is met through the battery management module 26, supplies power to the power supply management module 3 through the first output circuit 23, supplies power to the line control brake system 41 through the second output circuit 24, and supplies power to the electronic parking brake system 42 through the third output circuit 25, so as to supply power to the power supply management module 3, the line control brake system 41 and the electronic parking brake system 42 by using the energy stored in the battery pack 21, and realize redundant power supply.

[0050] In an embodiment, as shown, Fig. 3 The vehicle power supply system further comprises a trigger switch. The battery management module 26 is connected with the trigger switch 5, controls the second output circuit 24 to be turned on when the main battery module 1 is abnormal, controls the first output circuit 23 to be turned on or controls the first output circuit 23 and the second output circuit 24 to be turned on when the main battery module 1 is abnormal and a trigger signal of the trigger switch 5 is received.

[0051] As an example, when the main battery module 1 is out of power and cannot start the vehicle, the user can generate a trigger signal to the battery management module 26 of the redundant battery module 2 by triggering the trigger switch 5, so that the battery management module 26 controls the first output circuit 23 to be turned on, or controls the first output circuit 23 and the second output circuit 24 to be turned on when the main battery module 1 is abnormal and the trigger signal of the trigger switch 5 is received, so that the user can quickly start the vehicle by triggering the trigger switch 5, and improve the user experience.

[0052] In an embodiment, the trigger switch 5 is a tailgate switch or a door handle switch of the vehicle, which is convenient for the user to trigger and improves the user experience.

[0053] In an embodiment, the battery management module 26 includes a controller and a first timer; the first timer is connected to the controller and is used to time the trigger time of the trigger signal and output a first timing time; the controller is connected to the charging circuit 22, the first output circuit 23 and the second output circuit 24, and is used to control the first output circuit 23 to be turned on, or control the first output circuit 23 and the second output circuit 24 to be turned on when the main battery module 1 is abnormal and the first timing time meets a first preset time.

[0054] The first preset time can be a time range or a time threshold. In this example, the first preset time is a time range of 5 seconds to 30 seconds.

[0055] As an example, the first timer times the trigger time of the trigger signal after the user triggers the trigger switch 5 and outputs a first timing time. The controller controls the first output circuit 23 to be turned on, or controls the first output circuit 23 and the second output circuit 24 to be turned on according to the first voltage of the main battery module 1 output by the charging circuit 22 after the first voltage is used to judge that the main battery module 1 is out of power, and the first timing time is 5 seconds to 30 seconds. In this example, the first preset time is set to prevent the trigger switch 5 from being triggered by mistake or the trigger switch 5 from being stuck.

[0056] In an embodiment, the battery management module 26 further includes a second timer; the second timer is used to time the on time of the first output circuit 23 and output a second timing time; the controller is further connected to the second timer and is used to control the first output circuit 23 to be turned off when the second timing time meets a second preset time.

[0057] Exemplarily, the second preset time is 30 seconds. It can be understood that the second preset time can be set according to actual needs, which is not limited herein.

[0058] In the embodiment, when the main battery module 1 is in power shortage and the user needs to start the vehicle, the controller controls the first output circuit 23 to be turned on to supply power to the power supply management module 3 to ensure that the vehicle can be started normally, and at the same time, in order to prevent the redundant battery module 2 from being powered off too much, the second timer counts the on time of the first output circuit 23 and outputs a second counting time, and the controller is also connected with the second timer, and is used to control the first output circuit 23 to be turned off when the second counting time meets a second preset time, so as to prevent the redundant battery module 2 from being powered off too much while meeting the user's demand of entering and starting the vehicle.

[0059] In an embodiment, the vehicle power supply system further comprises a vehicle body electronic stability system 43 connected with the power supply management module 3. In the embodiment, when the main battery module 1 fails, the power supply management module 3 can be supplied with power by the redundant battery module 2, and then the vehicle body electronic stability system 43 can be supplied with power by the power supply management module 3, so that the vehicle body electronic stability system 43 can cooperate with the line control braking system 41 and the electronic parking brake system 42 to realize that the redundant battery module 2 can still support the vehicle to brake at a 3-time 0.3g deceleration and ensure that the electronic parking brake system 42 can work normally after the vehicle is parked on the side, thereby ensuring the safety during driving.

[0060] The embodiment provides a vehicle comprising the vehicle power supply system as shown in the embodiment. Figs. 1 to 3 The embodiment provides a vehicle comprising the vehicle power supply system as shown in the embodiment.

[0061] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A power supply system for a vehicle, characterized by comprising: The vehicle power supply system comprises a main battery module, a redundant battery module, a power supply management module, a line control braking system and an electronic parking brake system; a positive electrode of the main battery module is connected with a first input end of the power supply management module, and a negative electrode of the main battery module is grounded; a first output end of the power supply management module is connected with the line control braking system, and a second output end of the power supply management module is connected with the electronic parking brake system; a positive electrode of the redundant battery module is connected with a third output end of the power supply management module, a negative electrode of the redundant battery module is grounded, a first output end of the redundant battery module is connected with the line control braking system, a second output end of the redundant battery module is connected with the electronic parking brake system, and a third output end of the redundant battery module is connected with the first input end of the power supply management module.

2. The vehicle power supply system of claim 1, wherein, The power supply management module comprises a front compartment electrical box.

3. The vehicle power supply system of claim 1, wherein, The redundant battery module comprises a battery pack, a charging circuit, a first output circuit, a second output circuit, a third output circuit and a battery management module; the charging circuit is connected with the battery pack and the third output end of the power supply management module, and is used for charging the battery pack; the first output circuit is connected with the battery pack and the first input end of the power supply management module, and is used for supplying power to the power supply management module; the second output circuit is connected with the battery pack and the line control braking system, and is used for supplying power to the line control braking system; the third output circuit is connected with the battery pack and the electronic parking brake system, and is used for supplying power to the electronic parking brake system; the battery management module is connected with the charging circuit, the first output circuit, the second output circuit and the third output circuit, and is used for controlling the first output circuit, the second output circuit and / or the third output circuit to be turned on when a preset power supply condition is met.

4. The vehicle power supply system of claim 3, wherein The vehicle power supply system further comprises a trigger switch; the battery management module is connected with the trigger switch, and is used for controlling the second output circuit and / or the third output circuit to be turned on when the main battery module is abnormal; when the main battery module is abnormal and a trigger signal of the trigger switch is received, the battery management module is used for controlling the first output circuit to be turned on, or controlling the first output circuit, the second output circuit and / or the third output circuit to be turned on.

5. The vehicle power supply system of claim 4, wherein The trigger switch is a tail door switch or a door handle switch of the vehicle.

6. The vehicle power supply system of claim 4, wherein The battery management module comprises a controller and a first timer; the first timer is connected with the controller, and is used for timing a trigger time of the trigger signal and outputting a first timing time; the controller is connected with the charging circuit, the first output circuit and the second output circuit, and is used for controlling the first output circuit to be turned on, or controlling the first output circuit and the second output circuit to be turned on when the main battery module is abnormal and the first timing time meets a first preset time.

7. The vehicle power supply system of claim 6, wherein The battery management module further comprises a second timer; the second timer is used for timing a turn-on time of the first output circuit and outputting a second timing time; and the controller is connected with the charging circuit, the first output circuit and the second output circuit, and is used for controlling the first output circuit to be turned on, or controlling the first output circuit and the second output circuit to be turned on when the main battery module is abnormal and the first timing time meets a first preset time. The controller is further connected with the second timer, and is configured to control the first output circuit to be disconnected when the second timing time meets a second preset time.

8. The vehicle power supply system of claim 1, wherein, The vehicle power supply system further comprises a vehicle body electronic stability system connected with the power supply management module.

9. A vehicle characterized by comprising: The vehicle power supply system comprises the vehicle power supply system according to any one of claims 1 to 7.

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