Low voltage power supply system, power management strategy and vehicle

Abstract

The application discloses a low-voltage power supply system, a power management strategy and a vehicle, and relates to the technical field of power supply systems. The low-voltage power supply system comprises a power battery, a voltage converter, a main storage battery, a secondary storage battery, a vehicle body controller, a vehicle electrical equipment and an on-off control component; the power battery is electrically connected to the main storage battery and the secondary storage battery through the voltage converter; the main storage battery is electrically connected to the vehicle body controller and the vehicle electrical equipment; the secondary storage battery is electrically connected to the vehicle body controller; and the vehicle body controller can change the working state of the on-off control component. The power supply mode of the application is flexible, the power supply of the main storage battery to the vehicle electrical equipment and the vehicle body controller can be stopped when there is a dormant abnormal controller node, the power supply of the secondary storage battery to the vehicle body controller can be maintained, and the vehicle body controller can normally receive a remote key signal after the vehicle is powered off due to the power loss caused by the vehicle dormant abnormality.

Description

TECHNICAL FIELD

[0001] The present application relates to a vehicle power supply system, in particular to a low-voltage power supply system, a power supply management strategy and a vehicle. BACKGROUND

[0002] The power system of a new energy vehicle is composed of two core components: a high-voltage power battery and a low-voltage storage battery. The low-voltage storage battery system functions to receive charging from the power battery when the vehicle is normally operating, and then converts this energy into low-voltage power suitable for use by various electrical devices in the vehicle, providing stable power supply for devices such as door locks, vehicle networking, lighting, etc. When the vehicle has completed its driving task, the vehicle is powered off and the entire vehicle network is in hibernation, if the vehicle electrical equipment is abnormally working, it may cause the storage battery to consume power at an accelerated rate, and when the remaining power of the vehicle storage battery falls below a preset threshold, the vehicle starts the power battery according to the preset power compensation strategy to control the power battery to compensate the storage battery, but frequent power compensation may cause the vehicle power battery to run out of power, and in severe cases, it may even cause the vehicle to be unable to start, and the door lock to be unable to be unlocked or locked by receiving the remote key signal. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a low-voltage power supply system, a power supply management strategy and a vehicle, which has flexible power supply mode, can stop the main storage battery from supplying power to the vehicle electrical equipment and the vehicle body controller when there is a hibernating abnormal controller node, can prevent the main and auxiliary storage batteries from running out of power due to high static power consumption of the vehicle, causing the vehicle to be unable to be normally unlocked, and can keep the auxiliary storage battery supplying power to the vehicle body controller, ensuring that the vehicle body controller can normally receive the remote key signal and the vehicle can realize remote unlocking and locking functions when the vehicle hibernates abnormally and the vehicle electrical equipment is powered off.

[0004] The low-voltage power supply system of the present application comprises a power battery, a voltage converter, a main storage battery, an auxiliary storage battery, a vehicle body controller, vehicle electrical equipment and a on-off control component; the power battery is electrically connected to the main storage battery and the auxiliary storage battery through the voltage converter, the main storage battery is electrically connected to the vehicle body controller and the vehicle electrical equipment, and the auxiliary storage battery is electrically connected to the vehicle body controller.

[0005] The vehicle body controller can change the working state of the on-off control component to change the on-off state between the voltage converter and the auxiliary storage battery, the on-off state between the main storage battery and the vehicle body controller, and the on-off state between the main storage battery and the vehicle electrical equipment.

[0006] Further, the on-off control assembly comprises a first relay and a second relay, the vehicle body controller being capable of controlling on-off states of the first relay and the second relay; the low-voltage power supply system further comprises a first power supply wire harness and a second power supply wire harness; the auxiliary storage battery, the first relay, the main storage battery and the second relay are connected in series through the low-voltage power supply wire harness in sequence, a head end of the first power supply wire harness being connected to the low-voltage power supply wire harness between the first relay and the auxiliary storage battery, a head end of the second power supply wire harness being connected to the low-voltage power supply wire harness between the second relay and the vehicle electrical equipment, and tail ends of the first power supply wire harness and the second power supply wire harness being connected to the vehicle body controller.

[0007] Further, the power battery and the voltage converter are connected through a high-voltage power supply wire harness, the voltage converter being connected to the low-voltage power supply wire harness between the first relay and the main storage battery through a low-voltage power supply wire harness; the vehicle body controller is connected to the first relay and the second relay through a hard wire.

[0008] Further, the capacity of the auxiliary storage battery is less than that of the main storage battery.

[0009] Further, the vehicle further comprises a vehicle controller, a gateway and a TBOX, the vehicle controller being communicatively connected to the power battery and the gateway, the voltage converter and the vehicle body controller being communicatively connected to the gateway, the gateway being communicatively connected to the TBOX, and the TBOX being capable of sending signals to a user end through a cloud.

[0010] Further, the vehicle body controller is configured to:

[0011] when the vehicle is powered on and the vehicle network is woken up, control the on-off control assembly to keep the voltage converter and the auxiliary storage battery in a conductive state, the main storage battery and the vehicle body controller in a conductive state, and the main storage battery and the vehicle electrical equipment in a conductive state;

[0012] when the vehicle is powered off and the vehicle network is in a sleep state, and the main storage battery or / and the auxiliary storage battery meets a power compensation condition, compensate power of the main storage battery or / and the auxiliary storage battery through the power battery and the voltage converter, and record a number of times of power compensation in a preset time period, if the number of times of power compensation exceeds a preset number of times, analyze whether there is a sleep abnormal controller node in the vehicle network;

[0013] When the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether the reset success condition is met; if the reset success condition is met, the on-off control component is controlled to keep the voltage converter and the auxiliary battery connected, the main battery and the vehicle body controller connected, and the main battery and the whole vehicle electrical equipment connected; if the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary battery, the circuit between the main battery and the vehicle body controller, and the circuit between the main battery and the whole vehicle electrical equipment; at this time, the vehicle body controller is powered by the auxiliary battery.

[0014] Further, when the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether the reset success condition is met, including:

[0015] Obtaining information of the sleep abnormal controller node that causes the whole vehicle network to be abnormal when the whole vehicle network is in a sleep state;

[0016] Generating a reset request signal according to the information of the sleep abnormal controller node, and sending the reset request signal to the sleep abnormal controller node;

[0017] Receiving a reset state signal fed back by the sleep abnormal controller node;

[0018] Collecting the state of the whole vehicle network again, if the sleep abnormal controller node no longer exists, it is determined that the reset success condition is met; if the sleep abnormal controller node is still identified to exist, it is determined that the reset success condition is not met, at this time, the TBOX is awakened, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0019] A power management strategy in the application, comprising:

[0020] When the vehicle is powered on and the whole vehicle network is awakened, the power battery and the voltage converter provide power supply for the main battery or / and the auxiliary battery, and the main battery provides power supply for the vehicle body controller and the whole vehicle electrical equipment;

[0021] When the vehicle is powered off and the whole vehicle network is in a sleep state, and the main battery or / and the auxiliary battery meets the power compensation condition, the power battery and the voltage converter compensate power for the main battery or / and the auxiliary battery, and the number of power compensation times in a preset time period is recorded, if the number of power compensation times exceeds a preset number, it is analyzed whether there is a sleep abnormal controller node in the whole vehicle network;

[0022] When the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether a reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power supply for the main storage battery or / and the auxiliary storage battery, the main storage battery provides power supply for the vehicle body controller and the whole vehicle electrical equipment; if the reset success condition is not met, the main storage battery does not provide power supply for the vehicle body controller and the whole vehicle electrical equipment, the vehicle body controller is provided with power supply by the auxiliary storage battery, and the power battery and the voltage converter do not provide power supply for the auxiliary storage battery.

[0023] Further, the control of the sleep abnormal controller node to reset when the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, and the judgment of whether a reset success condition is met include:

[0024] The vehicle body controller acquires information of the sleep abnormal controller node which causes the whole vehicle network to be abnormal when the whole vehicle network is in a sleep state;

[0025] A reset request signal is generated according to the information of the sleep abnormal controller node, and the reset request signal is sent to the sleep abnormal controller node;

[0026] The vehicle body controller receives a reset state signal fed back by the sleep abnormal controller node;

[0027] The vehicle body controller collects and judges the whole vehicle network state again, if the sleep abnormal controller node does not exist, it is determined that the reset success condition is met; if the sleep abnormal controller node is still identified to exist, it is determined that the reset success condition is not met, at this time, the TBOX is woken up, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0028] A vehicle in the application includes the above low-voltage power supply system or uses the above power management strategy.

[0029] The application has the following beneficial effects:

[0030] (1) The low-voltage power supply system of the present application is provided with a main storage battery, a secondary storage battery and a on-off control assembly, so that the power supply mode of the low-voltage power supply system is more flexible. In the case that the vehicle is powered off, the whole vehicle network is in a sleep state, the body controller identifies that there is a sleep abnormal controller node, and the sleep abnormal controller node reset is unsuccessful, the power supply of the main storage battery to the whole vehicle electrical equipment and the body controller is stopped. At this time, after the vehicle door is unlocked / locked, other functions such as automobile OTA, vehicle networking, lighting, etc. cannot be realized, so that the main and secondary storage batteries can be prevented from being discharged due to large static power consumption of the vehicle, and the vehicle cannot be normally unlocked, and the service life of the storage battery can be prevented from being reduced due to deep discharge of the storage battery. Since the power supply of the secondary storage battery to the body controller is retained, it is ensured that the body controller can normally receive the remote key signal and realize the remote unlocking and locking functions after the vehicle sleep abnormality causes the discharge and the power supply of the whole vehicle electrical equipment is cut off. The user can open the door with the remote key without external equipment.

[0031] (2) The low-voltage power supply system of the present application is provided with a first power supply harness, a second power supply harness, a main storage battery and a secondary storage battery, so that the low-voltage power supply system is a dual power supply system, and two power supplies in total supply power to the body controller. In the case of abnormal vehicle conditions, such as collision causing a power supply to be cut off, the other power supply can still supply power, thereby ensuring that the vehicle door can be normally unlocked and avoiding that the passenger is locked in the vehicle.

[0032] (3) The low-voltage power supply system of the present application can control the reset of the sleep abnormal controller node when the vehicle is powered off, the whole vehicle network is in a sleep state, and the body controller identifies that there is a sleep abnormal controller node.

[0033] (4) The low-voltage power supply system of the present application can realize the interaction between the vehicle and the user terminal, and can wake up the TBOX and send information to the user terminal through the cloud to prompt the vehicle abnormality when the reset of the sleep abnormal controller node is unsuccessful. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to make the purpose, technical scheme and beneficial effects of the present application clearer, the present application is described below with reference to the following drawings:

[0035] Figure 1 The figure is a schematic diagram of the architecture of the low-voltage power supply system of the present application.

[0036] Figure 2 The figure is a flowchart of the power management strategy of the present application. DETAILED DESCRIPTION

[0037] The technical scheme of the present application will be described in detail below with reference to the drawings and examples.

[0038] As Figure 1The low-voltage power supply system in the embodiment includes a power battery, a voltage converter, a main storage battery, a secondary storage battery, a vehicle body controller, a vehicle electrical device, and an on-off control assembly; the power battery is electrically connected to the main storage battery and the secondary storage battery through the voltage converter; the main storage battery is electrically connected to the vehicle body controller and the vehicle electrical device; and the secondary storage battery is electrically connected to the vehicle body controller.

[0039] The vehicle body controller can change the working state of the on-off control assembly to change the on-off state between the voltage converter and the secondary storage battery, the on-off state between the main storage battery and the vehicle body controller, and the on-off state between the main storage battery and the vehicle electrical device.

[0040] The vehicle body controller is a BCM, the voltage converter is a DCDC, the power battery is integrated with a battery management system (BMS), the main storage battery is integrated with a main low-voltage battery management system (main LBMS), the secondary storage battery is integrated with a secondary low-voltage battery management system (secondary LBMS), the vehicle electrical device does not include the vehicle body controller, and the vehicle electrical device includes an automobile OTA (Over The Air technology), a vehicle networking, and lighting functional devices.

[0041] The main storage battery, the secondary storage battery, and the on-off control assembly are provided to make the power supply mode of the low-voltage power supply system more flexible. When the vehicle is powered on and the vehicle network is woken up, the power battery and the voltage converter provide power for the main storage battery or / and the secondary storage battery, and the main storage battery provides power for the vehicle body controller and the vehicle electrical device. In the case that the vehicle is powered off, the vehicle network is in a sleep state, the vehicle body controller identifies that there is a sleep abnormal controller node, and the sleep abnormal controller node is not successfully reset, the power supply of the main storage battery to the vehicle electrical device and the vehicle body controller is stopped. At this time, after the vehicle door is unlocked / locked, other functions such as automobile OTA, vehicle networking, and lighting cannot be realized, thereby preventing the main and secondary storage batteries from being discharged due to large static power consumption of the vehicle, and further preventing the service life of the storage battery from being reduced due to deep discharge of the storage battery. Since the power supply of the secondary storage battery to the vehicle body controller is retained, the vehicle body controller can normally receive a remote key signal and realize remote unlocking and locking functions after the vehicle is powered off due to sleep abnormality and the vehicle electrical device is powered off, so that the user can open the door with the remote key without external equipment.

[0042] In the embodiment, the on-off control assembly includes a first relay and a second relay, and the vehicle body controller can control on-off states of the first relay and the second relay; the low-voltage power supply system further includes a first power supply wire harness and a second power supply wire harness; the auxiliary storage battery, the first relay, the main storage battery and the second relay are connected in series through the low-voltage power supply wire harness in sequence, a first end of the first power supply wire harness is connected to the low-voltage power supply wire harness between the first relay and the auxiliary storage battery, a first end of the second power supply wire harness is connected to the low-voltage power supply wire harness between the second relay and the vehicle electrical equipment, and a second end of the first power supply wire harness and a second end of the second power supply wire harness are both connected to the vehicle body controller.

[0043] By arranging the first power supply wire harness, the second power supply wire harness, the main storage battery and the auxiliary storage battery, the low-voltage power supply system is a dual power supply system, and two power supplies in total supply power to the vehicle body controller, so that in the case of vehicle abnormality, such as collision, causing a power supply to be cut off, the other power supply can still supply power, thereby ensuring that the vehicle door can be normally unlocked, and avoiding that the passenger is locked in the vehicle.

[0044] The first relay is used to cut off or connect the circuit between the voltage converter and the auxiliary storage battery, and is also used to cut off or connect the circuit between the main storage battery and the first power supply wire harness. The second relay is used to cut off or connect the circuit between the main storage battery and the second power supply wire harness, and is also used to cut off or connect the circuit between the main storage battery and the vehicle electrical equipment.

[0045] In the embodiment, the power battery and the voltage converter are connected through a high-voltage power supply wire harness, the voltage converter is connected to the low-voltage power supply wire harness between the first relay and the main storage battery through a low-voltage power supply wire harness, and the vehicle body controller is connected to the first relay and the second relay through a hard wire.

[0046] In the embodiment, the capacity of the auxiliary storage battery is less than that of the main storage battery. For example, the capacity of the main storage battery is 45 Ah, and the capacity of the auxiliary storage battery is 10 Ah. By cutting off the power supply of the main storage battery in some abnormal working conditions, the power supply of the auxiliary storage battery to the vehicle body controller is retained, so the influence on the auxiliary storage battery is greater than that on the main storage battery, the capacity of the auxiliary storage battery is small, the price of the auxiliary storage battery is less than that of the main storage battery, and when the storage battery needs to be replaced, the user spends less money to replace the auxiliary storage battery.

[0047] In the embodiment, a vehicle controller, a gateway, and a TBOX are further included. The vehicle controller is in communication connection with the power battery and the gateway. The voltage converter and the vehicle body controller are in communication connection with the gateway. The gateway is in communication connection with the TBOX. The TBOX can send a signal to a user terminal through the cloud. The user terminal can be a mobile terminal bound to a user. The gateway is referred to as GW (Gateway), and the vehicle controller is referred to as VCU. The communication connection can be through a CAN wire harness.

[0048] The TBOX is used to realize vehicle network functions, realize vehicle power supplement information uploading to the cloud, realize interaction between the vehicle and the user terminal, and wake up the TBOX when the reset of the sleep abnormal controller node is unsuccessful, and send information to the user terminal through the cloud to prompt the vehicle abnormality.

[0049] In the embodiment, the vehicle body controller is configured to:

[0050] When the vehicle is powered on and the vehicle network is woken up, the on-off control component is controlled to keep the voltage converter and the auxiliary battery in a pass-through state, the main battery and the vehicle body controller in a pass-through state, and the main battery and the vehicle electrical equipment in a pass-through state.

[0051] When the vehicle is powered off and the vehicle network is in a sleep state, and the main battery or / and the auxiliary battery meets the power supplement condition, the power battery and the voltage converter are used to supplement power to the main battery or / and the auxiliary battery, and the number of power supplement times in a preset time period is recorded. If the number of power supplement times exceeds a preset number, it is analyzed whether the vehicle network has a sleep abnormal controller node.

[0052] When the vehicle is powered off and the vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether a reset success condition is met. If the reset success condition is met, the on-off control component is controlled to keep the voltage converter and the auxiliary battery in a pass-through state, the main battery and the vehicle body controller in a pass-through state, and the main battery and the vehicle electrical equipment in a pass-through state. If the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary battery, the circuit between the main battery and the vehicle body controller, and the circuit between the main battery and the vehicle electrical equipment. At this time, the vehicle body controller is powered by the auxiliary battery.

[0053] Whether the main battery and / or the auxiliary battery meet the conditions for recharging is a matter of existing technology. For example, a certain car has a main battery capacity of 45Ah, an auxiliary battery capacity of 10Ah, and a dark current of 50mA in the normal dormant state of the vehicle. The recharging thresholds set for both the main and auxiliary batteries are 50%. When the vehicle is powered off and the entire vehicle network is in dormant state, if the main low-voltage battery management system detects that the current remaining charge value (SOC) of the main battery is less than 50%, or / and the auxiliary low-voltage battery management system detects that the current remaining charge value (SOC) of the auxiliary battery is less than 50%, then the recharging conditions are considered met. The preset time period can be 12 hours, and the preset number of times can be 10 times. That is, if the number of charging times exceeds 10 within 12 hours, the entire vehicle network is analyzed to see if there are any abnormally dormant controller nodes. The vehicle body controller collects and determines the reasons why the controllers of various electrical equipment do not go into sleep mode. When it is identified that the reason why a certain electrical equipment controller does not go into sleep mode is abnormal, it identifies the existence of an abnormally dormant controller node and resets the abnormally dormant controller node under the premise that the vehicle allows the controller to be reset.

[0054] In this embodiment, when the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the presence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes:

[0055] Acquire information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state;

[0056] generating a reset request signal according to the information of the sleep-abnormal controller node, and sending the reset request signal to the sleep-abnormal controller node;

[0057] receiving a reset state signal fed back by the sleep abnormality controller node;

[0058] The vehicle's network status is collected again and determined. If the dormant abnormal controller node no longer exists, the reset success conditions are determined to be met. If the dormant abnormal controller node is still identified, the reset success conditions are determined to be unsatisfactory. The TBOX is then awakened and a message is sent to the user via the cloud to alert the user of the vehicle abnormality. Only after this message is sent does the on / off control component control the circuit between the main battery and the body controller, as well as the circuit between the main battery and the vehicle's electrical equipment.

[0059] like Figure 2 As shown, a power management strategy in this embodiment includes:

[0060] When the vehicle is powered on and the whole vehicle network is woken up, the power battery and the voltage converter provide power for the main storage battery and / or the auxiliary storage battery, the main storage battery provides power for the body controller and the whole vehicle electrical equipment;

[0061] When the vehicle is powered off and the whole vehicle network is in a sleep state, and the main storage battery and / or the auxiliary storage battery meets the power compensation condition, the power battery and the voltage converter compensate power for the main storage battery and / or the auxiliary storage battery, and the number of times of power compensation in a preset time period is recorded, if the number of times of power compensation exceeds a preset number of times, it is analyzed whether there is a sleep abnormal controller node in the whole vehicle network;

[0062] When the vehicle is powered off and the whole vehicle network is in a sleep state, and the body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether a reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power for the main storage battery and / or the auxiliary storage battery, and the main storage battery provides power for the body controller and the whole vehicle electrical equipment; if the reset success condition is not met, the main storage battery does not provide power for the body controller and the whole vehicle electrical equipment, the body controller is powered by the auxiliary storage battery, and the power battery and the voltage converter do not provide power for the auxiliary storage battery.

[0063] In the embodiment, when the vehicle is powered off and the whole vehicle network is in a sleep state, and the body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is judged whether a reset success condition is met, comprising:

[0064] The body controller acquires information of the sleep abnormal controller node that causes the whole vehicle network to be abnormal when the whole vehicle network is in a sleep state;

[0065] A reset request signal is generated according to the information of the sleep abnormal controller node, and the reset request signal is sent to the sleep abnormal controller node;

[0066] The body controller receives a reset state signal fed back by the sleep abnormal controller node;

[0067] The body controller collects and judges the state of the whole vehicle network again, if the sleep abnormal controller node no longer exists, it is determined that the reset success condition is met; if the sleep abnormal controller node is still identified to exist, it is determined that the reset success condition is not met, at this time, the TBOX is woken up, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

[0068] The vehicle in the embodiment comprises the low-voltage power supply system or uses the power management strategy.

[0069] Finally, it is to be explained that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the purpose and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A low voltage power supply system characterized by: The low-voltage power supply system comprises a power battery, a voltage converter, a main storage battery, a secondary storage battery, a vehicle body controller, a vehicle electrical equipment and an on-off control assembly; the power battery is electrically connected with the main storage battery and the secondary storage battery through the voltage converter; the main storage battery is electrically connected with the vehicle body controller and the vehicle electrical equipment; the secondary storage battery is electrically connected with the vehicle body controller; The vehicle body controller can change the working state of the on-off control assembly to change the on-off state between the voltage converter and the secondary storage battery, the on-off state between the main storage battery and the vehicle body controller and the on-off state between the main storage battery and the vehicle electrical equipment. The on-off control assembly comprises a first relay and a second relay, and the vehicle body controller can control the on-off state of the first relay and the second relay; the low-voltage power supply system further comprises a first power supply wire harness and a second power supply wire harness. The secondary storage battery, the first relay, the main storage battery and the second relay are connected in series through low-voltage power supply wire harnesses; the first end of the first power supply wire harness is connected to the low-voltage power supply wire harness between the first relay and the secondary storage battery; the first end of the second power supply wire harness is connected to the low-voltage power supply wire harness between the second relay and the vehicle electrical equipment; the tail end of the first power supply wire harness and the tail end of the second power supply wire harness are both connected to the vehicle body controller; in the case of vehicle abnormality, the main storage battery power supply is cut off, but the secondary storage battery can still supply power to the vehicle body controller, ensuring that the vehicle door can be normally unlocked.

2. The low voltage power supply system of claim 1, wherein: The power battery and the voltage converter are connected through a high-voltage power supply wire harness; the voltage converter is connected to the low-voltage power supply wire harness between the first relay and the main storage battery through a low-voltage power supply wire harness. The vehicle body controller is connected to the first relay and the second relay through a hard wire.

3. The low voltage power supply system of claim 1, wherein: The capacity of the secondary storage battery is smaller than that of the main storage battery.

4. The low voltage power supply system according to any of claims 1-3, characterized in that: The low-voltage power supply system further comprises a vehicle controller, a gateway and a TBOX; the vehicle controller is communicatively connected with the power battery and the gateway; the voltage converter and the vehicle body controller are both communicatively connected with the gateway; the gateway is communicatively connected with the TBOX; the TBOX can send signals to the user end through the cloud.

5. The low voltage power supply system of claim 4, wherein, The vehicle body controller is configured to: When the vehicle is powered on and the vehicle network is woken up, control the on-off control assembly to keep the voltage converter and the secondary storage battery in an on state, the main storage battery and the vehicle body controller in an on state and the main storage battery and the vehicle electrical equipment in an on state; When the vehicle is powered off and the vehicle network is in a dormant state, and the main storage battery or / and the secondary storage battery meets the power supplement condition, supplement power to the main storage battery or / and the secondary storage battery through the power battery and the voltage converter, and record the number of power supplement times within a preset time period; if the number of power supplement times exceeds a preset number, analyze whether there is a dormant abnormal controller node in the vehicle network. When the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node, the sleep abnormal controller node is controlled to reset, and it is determined whether a reset success condition is met; if the reset success condition is met, the on-off control component is controlled to keep the voltage converter and the auxiliary storage battery in a path, the main storage battery and the vehicle body controller in a path, and the main storage battery and the whole vehicle electrical equipment in a path; if the reset success condition is not met, the on-off control component is controlled to cut off the circuit between the voltage converter and the auxiliary storage battery, the circuit between the main storage battery and the vehicle body controller, and the circuit between the main storage battery and the whole vehicle electrical equipment; at this time, the vehicle body controller is powered by the auxiliary storage battery.

6. The low voltage power supply system of claim 5, wherein, The control of the sleep abnormal controller node to reset when the vehicle is powered off and the whole vehicle network is in a sleep state, and the vehicle body controller identifies that there is a sleep abnormal controller node includes: Obtaining information of a sleep abnormal controller node that causes the whole vehicle network to be abnormal when the whole vehicle network is in a sleep state; Generating a reset request signal according to the information of the sleep abnormal controller node, and sending the reset request signal to the sleep abnormal controller node; Receiving a reset state signal fed back by the sleep abnormal controller node; Collecting and determining the state of the whole vehicle network again, if the sleep abnormal controller node no longer exists, it is determined that the reset success condition is met; if the sleep abnormal controller node is still identified to exist, it is determined that the reset success condition is not met, at this time, the TBOX is awakened, and information is sent to the user end through the cloud to prompt the vehicle abnormality.

7. A power management strategy, characterized by, The power management strategy for the low-voltage power supply system according to any one of claims 1-6 comprises: When the vehicle is powered on and the whole vehicle network is awakened, the power battery and the voltage converter provide power supply for the main storage battery or / and the auxiliary storage battery, and the main storage battery provides power supply for the vehicle body controller and the whole vehicle electrical equipment; When the vehicle is powered off and the whole vehicle network is in a sleep state, and the main storage battery or / and the auxiliary storage battery meets the power compensation condition, the power battery and the voltage converter compensate power for the main storage battery or / and the auxiliary storage battery, and the number of power compensation times in a preset time period is recorded, if the number of power compensation times exceeds a preset number, it is analyzed whether there is a sleep abnormal controller node in the whole vehicle network; When the vehicle is powered off and the entire vehicle network is in a dormant state, and the body controller identifies the existence of a dormant abnormal controller node, it controls the dormant abnormal controller node to be reset, and determines whether the reset success condition is met; if the reset success condition is met, the power battery and the voltage converter provide power to the main battery and / or the auxiliary battery, and the main battery provides power to the body controller and the entire vehicle electrical equipment; if the reset success condition is not met, the main battery does not provide power to the body controller and the entire vehicle electrical equipment, the body controller is powered by the auxiliary battery, and the power battery and the voltage converter do not provide power to the auxiliary battery.

8. The power management strategy of claim 7, wherein: When the vehicle is powered off and the vehicle network is in a dormant state, and the body controller identifies the presence of a dormant abnormal controller node, controlling the dormant abnormal controller node to reset, and determining whether a reset success condition is met includes: The vehicle body controller obtains information of a dormant abnormal controller node that causes the entire vehicle network to be abnormal when the entire vehicle network is in a dormant state; generating a reset request signal according to the information of the sleep-abnormal controller node, and sending the reset request signal to the sleep-abnormal controller node; The vehicle body controller receives a reset state signal fed back by the sleep abnormality controller node; The vehicle body controller collects and determines the vehicle network status again. If the dormant abnormal controller node no longer exists, it is determined that the reset success condition is met; if the dormant abnormal controller node is still identified, it is determined that the reset success condition is not met. At this time, the TBOX is awakened and a message is sent to the user end through the cloud to prompt the vehicle abnormality.

9. A vehicle characterized by: The low-voltage power supply system comprises the low-voltage power supply system according to any one of claims 1 to 6 or uses the power management strategy according to claim 8.

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