Vehicle power distribution device, power supply system and vehicle

Abstract

The utility model provides a vehicle power distribution device, a power supply system and a vehicle, and relates to the technical field of vehicle power distribution, the vehicle power distribution device comprises a first power distribution circuit and a second power distribution circuit which are arranged in parallel, and at least one of the first power distribution circuit and the second power distribution circuit is provided with a voltage conversion unit. The input ends of the first power distribution circuit and the second power distribution circuit are used for being connected with a power supply device, the output end of the first power distribution circuit is used for being connected with a first load, and the output end of the second power distribution circuit is used for being connected with a second load. The power distribution device for the vehicle can meet the electrical requirements of the vehicle, is convenient for supplying power to loads with different voltage requirements of the vehicle, does not need to be equipped with two sets of independent power supply systems, does not need to be equipped with independent voltage conversion modules for electrical parts with different voltage requirements, is beneficial to reducing the space requirements in the vehicle, and is convenient to use. The cost and the weight of the vehicle are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle power distribution technology field, especially relate to a vehicle power distribution device, simultaneously, the utility model relates to a vehicle power supply system and vehicle with the vehicle power distribution system. BACKGROUND

[0002] With the rapid advancement of automobile electrification, modern vehicles integrate multiple types of loads, from low-power ECUs (Engine Control unit, engine controller) to high-power drive motors, which have different voltage and power requirements.

[0003] However, the existing voltage platform is increasingly difficult to meet the complex and diverse electrical requirements of modern vehicles, in order to take into account the needs of low-power components and support high-power loads, the usual solution is to equip the vehicle with two independent power supply systems, two independent power supply systems for different voltage requirements of the load power supply.

[0004] The use of two independent power supply systems, each power supply system is usually equipped with an independent battery and charging equipment, this method can meet the needs of different voltages, but two independent power supply systems significantly increase the layout space requirements of the vehicle interior, at the same time, the additional battery and charging equipment will not only increase the overall cost of the vehicle, but also increase the overall weight of the vehicle.

[0005] Another solution is to use existing power distribution devices, while each electrical component that requires higher voltage is equipped with a voltage conversion unit, although this method can reduce the demand for additional power supply systems, but adding voltage conversion modules to multiple electrical components will also significantly increase the overall cost of the vehicle. SUMMARY

[0006] Therefore, the utility model aims at providing a vehicle power distribution device to provide two different voltages for the vehicle.

[0007] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0008] A vehicle power distribution device for distributing power from a power supply device to a first load and a second load, the vehicle power distribution device comprising a first power distribution circuit and a second power distribution circuit arranged in parallel;

[0009] Two voltage conversion units are provided in at least one of the first power distribution circuit and the second power distribution circuit, and the two voltage conversion units (103) are arranged in parallel.

[0010] The input ends of the first power distribution circuit and the second power distribution circuit are used for being connected with the power supply device, the output end of the first power distribution circuit is used for being connected with the first load, and the output end of the second power distribution circuit is used for being connected with the second load.

[0011] Further, the vehicle power distribution device further comprises a first controller; each voltage conversion unit comprises a DC-DC converter, and each DC-DC converter is connected with the first controller.

[0012] Further, the first load and the second load are both multiple; at least one of the first power distribution circuit and the second power distribution circuit comprises a main distribution circuit provided with the DC-DC converter and multiple branch distribution circuits connected in parallel at one end of the main distribution circuit; the other end of each main distribution circuit is used for being connected with the power supply device; the branch distribution circuits in the first power distribution circuit correspond to the first loads one by one and are connected correspondingly; the branch distribution circuits in the second power distribution circuit correspond to the second loads one by one and are connected correspondingly.

[0013] Further, the vehicle power distribution device further comprises multiple second controllers connected with the first controller, the second controllers correspond to the branch distribution circuits one by one; each branch distribution circuit is provided with a control switch, and each control switch is connected with the corresponding second controller.

[0014] Further, the control switch comprises at least one of a metal semiconductor field effect transistor, a relay, a high-side driver chip and an electronic fuse switch arranged in the branch distribution circuit.

[0015] Further, each second controller is integrated with a voltage detection unit, and the voltage detection unit is used for detecting the voltage in the corresponding branch distribution circuit.

[0016] Further, each second controller is integrated with a current detection unit, and the current detection unit is used for detecting the current in the corresponding branch distribution circuit; and / or each second controller is integrated with a temperature sensor, and the temperature sensor is used for detecting the temperature of the corresponding first load or second load.

[0017] Compared with the prior art, the vehicle power distribution device has the following advantages:

[0018] The utility model discloses a vehicle power distribution device, through adopting the first power distribution circuit and second power distribution circuit of parallelly connected setting, and setting two voltage conversion units in at least one power distribution circuit, make vehicle power distribution device realize providing two different voltage, compared with equipping two completely independent power supply system, help to reduce the space requirement in vehicle, reduce the cost and weight of vehicle, and compared with equipping voltage conversion module for each electrical component needing different voltage alone, can satisfy the demand of multiple load with lower cost, and can reduce the cost of whole vehicle.

[0019] Among them, voltage conversion unit is two, and two voltage conversion units are parallelly connected, so that two voltage conversion units can transform voltage simultaneously, which helps to avoid single voltage conversion unit overload, prolong its service life, in addition, if one of voltage conversion units fails, another voltage conversion unit can still work, thereby improving the reliability and fault tolerance of the whole vehicle power distribution device, and ensuring the stable operation of vehicle electrical system.

[0020] Moreover, the vehicle power distribution device further includes a first controller, and each voltage conversion unit includes a DC-DC converter, and each DC-DC converter is connected with the first controller. The first controller is used for centralized management and control of the whole power distribution system, and dynamically adjusts the working mode, output voltage and current and other parameters of each DC-DC converter according to the vehicle running state and the demand of different loads, so as to realize optimal power distribution.

[0021] Moreover, the main distribution circuit is provided with a DC-DC converter, and a plurality of branch power distribution circuits are connected in parallel on the main distribution circuit to correspond to different loads respectively. Since each load has a corresponding branch power distribution circuit, the failure of a single branch power distribution circuit will not affect the work of other branch power distribution circuits, thereby improving the reliability of the vehicle power distribution device.

[0022] In addition, each branch power distribution circuit has an independent second controller and a control switch, so that the second controller can flexibly turn on or off the corresponding load according to the specific demand, thereby optimizing power distribution, reducing the burden of the first controller, and improving the stability and efficiency of the vehicle power distribution device.

[0023] Furthermore, the control switch includes a metal semiconductor field effect transistor arranged in the branch power distribution circuit. The control switch has high reliability and service life, and can realize fast response, thereby reducing power loss, allowing more accurate control of power distribution. In addition, the second controller is integrated with a current detection unit and a temperature sensor, which helps to discover abnormal conditions such as overload and short circuit in the branch power distribution circuit in time, improves the safety of the whole electrical system, reduces the risk of fire and other safety hazards, and selects this integrated second controller, which is also conducive to saving layout space.

[0024] Another purpose of the utility model lies in providing a power supply system for vehicle, including power supply device, and with the power supply device connects the power distribution device for vehicle as described above.

[0025] The power supply system for vehicle and the power distribution device for vehicle described above have the same beneficial effects compared with the traditional technology, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings that form a part of the utility model are used to provide further understanding of the utility model, the illustrative embodiment of the utility model and its description are used to explain the utility model, and do not constitute undue limitation on the utility model.In the drawings,

[0027] Figure 1 The structural schematic diagram of the power distribution device for vehicle of the utility model embodiment one is described;

[0028] Figure 2 The structural schematic diagram of the power distribution device for vehicle including the first controller of the utility model embodiment one is described.

[0029] EXPLANATION OF REFERENCE NUMERALS

[0030] 1, power distribution device for vehicle;101, first power distribution circuit;1011, first load;102, second power distribution circuit;1021, second load;103, voltage conversion unit;104, first controller;1041, second controller;1042, control switch;

[0031] 2, power supply device;201, battery;202, charging module. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0033] In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "back" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connection", "connecting", "connecting piece" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0035] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0036] Embodiment one

[0037] The embodiment relates to a vehicle power distribution device 1, which can supply power to a first load 1011 and a second load 1021 with different voltage requirements of a vehicle by improving the structure thereof.

[0038] In modern vehicles, there are many different electrical loads inside the vehicle body, and their working voltage ranges are different, such as low-voltage loads such as lighting systems, instrument panels, electronic control units (ECU), and high-voltage loads such as air conditioning compressors and regenerative braking systems. Therefore, in the face of different voltage requirements of different electrical loads, there are usually two main solutions.

[0039] One solution is to use two independent power supply systems, which has the advantage of providing appropriate voltages for low-voltage (such as 12 V) and high-voltage (such as 48 V or higher) loads, respectively, ensuring that all electrical equipment can work normally without the need for additional voltage conversion steps, simplifying the design of power distribution. However, two independent power supply systems require more physical space to install their respective batteries 201 and charging devices, increasing the overall weight of the vehicle, thereby affecting fuel efficiency or the range of electric vehicles, and two independent power supply systems also increase the initial purchase cost of the vehicle and may also result in higher maintenance costs.

[0040] Another solution is to use a vehicle power distribution device 1 combined with a voltage conversion unit. In this solution, the vehicle only uses one main power supply system, and each electrical component that requires higher voltage is equipped with a separate voltage conversion unit through the vehicle power distribution device 1, reducing the dependence on multiple independent power supply systems. However, although the number of additional power supply systems is reduced, the addition of voltage conversion modules for multiple high-voltage loads also leads to an increase in cost.

[0041] Considering the advantages and disadvantages of the two schemes in the background art, designing a power distribution device that can meet different voltage requirements and effectively reduce the size and cost has become an important research direction. Based on this idea, the embodiment provides a vehicle power distribution device 1, which can supply power to the first load 1011 and the second load 1021 with different voltage requirements by improving its structure.

[0042] As shown in the overall structure, Figure 1 The vehicle power distribution device 1 of the embodiment is used to distribute the power of the power supply device 2 to the first load 1011 and the second load 1021, and the vehicle power distribution device 1 includes a first power distribution circuit 101 and a second power distribution circuit 102 arranged in parallel.

[0043] Specifically, in the embodiment, as a preferred implementation form, two voltage conversion units 103 are arranged in at least one of the first power distribution circuit 101 and the second power distribution circuit 102, and the two voltage conversion units 103 are arranged in parallel. The input end of the first power distribution circuit 101 and the input end of the second power distribution circuit 102 are used to be connected with the power supply device 2, the output end of the first power distribution circuit 101 is used to be connected with the first load 1011, and the output end of the second power distribution circuit 102 is used to be connected with the second load 1021.

[0044] By adopting the first power distribution circuit 101 and the second power distribution circuit 102 arranged in parallel, and arranging two voltage conversion units 103 in at least one of the power distribution circuits, the vehicle power distribution device 1 can provide two different voltages. Compared with equipping two completely independent power supply systems, it helps to reduce the space requirement inside the vehicle, reduce the cost and weight of the vehicle, and compared with equipping each electrical component requiring different voltage with a voltage conversion module, it can meet the needs of multiple loads at a lower cost, and reduce the cost of the whole vehicle.

[0045] Among them, the power supply device 2 provides low voltage, and one of the first power distribution circuit 101 or the second power distribution circuit 102 is provided with a voltage conversion unit 103. In the case of the power distribution circuit provided with the voltage conversion unit 103, the power distribution circuit provided with the voltage conversion unit 103 will convert the low voltage into high voltage under the action of the voltage conversion unit 103, and then output the high voltage to the corresponding load. The power distribution circuit without the voltage conversion unit 103 will directly output the low voltage to the corresponding load, so that the vehicle power distribution device 1 outputs two different voltages through the first power distribution circuit 101 or the second power distribution circuit 102.

[0046] In contrast, the power supply device 2 provides high voltage, and in the case that one of the first power distribution circuit 101 or the second power distribution circuit 102 is provided with a voltage conversion unit 103, the power distribution circuit provided with the voltage conversion unit 103 will convert the high voltage into low voltage under the action of the voltage conversion unit 103, and then output low voltage to the corresponding load, and the power distribution circuit without the voltage conversion unit 103 will directly output high voltage to the corresponding load, so that the vehicle power distribution device 1 outputs two different voltages through the first power distribution circuit 101 or the second power distribution circuit 102.

[0047] In addition, when the first power distribution circuit 101 and the second power distribution circuit 102 are both provided with a voltage conversion unit 103, the voltage provided by the power supply device 2 will be converted under the action of the voltage conversion unit 103, and the two voltage conversion units 103 will output two same or different voltages to the corresponding load after converting the voltage, providing greater flexibility, and the voltage demand of various loads can be accurately matched according to actual needs. It is worth mentioning that, in order to facilitate the distinction of the path of the power supply signal of the power distribution circuit, the embodiment shows the power supply signal in the form of a thick solid line segment. Figure 1

[0048] Specifically, the power supply device 2 can provide one of 12 V, 24 V or 48 V, and of course other voltage values can also be provided, which will not be described in detail here. Among them, the first power distribution circuit 101 can provide low voltage circuit for the first load 1011, and the first load 1011 usually includes one of the low voltage electrical components of the lighting system, instrument panel, electronic control unit (ECU) of the vehicle, etc. The second power distribution circuit 102 can provide high voltage circuit for the second load 1021, and the second load 1021 usually includes one of the high voltage electrical components of the air conditioning compressor, regenerative braking system, etc. of the vehicle.

[0049] The first power distribution circuit 101 preferably uses 0.35 mm² to 2.5 mm² copper wires, and a bellows or other protective material can also be used to protect the first power distribution circuit 101 from mechanical damage and environmental effects. The second power distribution circuit 102 preferably uses 6.0 mm² to 25.0 mm² copper wires, and additional protective measures such as metal sheath or special protective tube can also be used on the second power distribution circuit 102 to enhance mechanical strength and anti-interference ability.

[0050] ​Moreover, the voltage conversion units 103 are two, and the two voltage conversion units 103 are arranged in parallel. The advantage of such an arrangement is that the two voltage conversion units 103 can simultaneously convert voltage and balance the load current, which helps to avoid overloading of a single voltage conversion unit 103, prolong its service life, in addition, if one of the voltage conversion units 103 fails, the other voltage conversion unit 103 can still work, thereby improving the reliability and fault tolerance of the entire vehicle power distribution device 1, ensuring the stable operation of the vehicle electrical system, and manufacturers can flexibly adjust the design scheme according to specific application scenarios, increasing the flexibility of the design.

[0051] Furthermore, in the present embodiment, as a preferred implementation form, as shown in Figure 2 The vehicle power distribution device 1 further comprises a first controller 104, and each voltage conversion unit 103 comprises a DC / DC converter. For example, in the present embodiment, the first controller 104 adopts a high-performance microprocessor or embedded computer, and is equipped with rich interfaces and communication protocols to interact with various sensors, actuators and other electronic control units (ECU) of the vehicle.

[0052] The first controller 104 centrally manages and controls the entire power distribution system, dynamically adjusts the working mode, output voltage and current of each DC / DC converter according to the vehicle operating state and the needs of different loads, to achieve the optimal power distribution. The first controller 104 can also adjust the working state of the DC / DC converter in real time, avoid unnecessary energy conversion loss, and improve the energy utilization efficiency of the entire system. In order to distinguish the path of the monitoring signal of the first controller 104 to each DC / DC converter, the present embodiment shows the monitoring signal in the form of a solid line segment. Figure 2

[0053] As a preferred implementation, the first load 1011 and the second load 1021 are both multiple, and at least one of the first power distribution circuit 101 and the second power distribution circuit 102 comprises a main distribution circuit provided with a DC / DC converter, and a plurality of branch distribution circuits connected in parallel at one end of the main distribution circuit. The other end of each main distribution circuit is used to connect with the power supply device 2; the branch distribution circuits in the first power distribution circuit 101 correspond one-to-one to the first load 1011 and are connected respectively, and the branch distribution circuits in the second power distribution circuit 102 correspond one-to-one to the second load 1021 and are connected respectively.

[0054] Specifically, for example, in the present embodiment, with reference to Figure 2 ​As shown in the structure, the first power distribution circuit 101 includes one main distribution circuit and multiple branch distribution circuits connected in parallel to one end of the main distribution circuit. That is, one end of the main distribution circuit is connected to the power supply device 2, and the other end is connected to the multiple branch distribution circuits. The branch distribution circuits in the first power distribution circuit 101 correspond to the first loads one by one, and each branch distribution circuit has one end connected to the main distribution circuit and the other end used for connecting to the first load 1011.

[0055] The second power distribution circuit 102 includes two main distribution circuits and multiple branch distribution circuits. The two main distribution circuits are connected in parallel, and one end of the parallel connection is connected to the power supply device 2, and the other end of the parallel connection is connected to the multiple branch distribution circuits. The two voltage conversion units 103 are respectively arranged on the two main distribution circuits. That is, one end of each branch distribution circuit is connected to one end of the parallel connection of the main distribution circuits, and the other end of each branch distribution circuit is used for connecting to the second load 1021. In this embodiment, as another preferred implementation form, the first load 1011 and the second load 1021 are both multiple, and the first power distribution circuit 101 and the second power distribution circuit 102 both include main distribution circuits provided with DC / DC converters and multiple branch distribution circuits connected in parallel to one end of the main distribution circuits. The other end of each main distribution circuit is used for connecting to the power supply device 2. The branch distribution circuits in the first power distribution circuit 101 correspond to the first loads 1011 one by one and are connected correspondingly. The branch distribution circuits in the second power distribution circuit 102 correspond to the second loads 1021 one by one and are connected correspondingly.

[0056] It can be understood that in the case of failure of a single branch distribution circuit, the working of other branch distribution circuits will not be affected, improving the reliability of the vehicle power distribution device 1. Moreover, since each branch distribution circuit works independently, if the demand of a certain load changes or needs to be upgraded, the second controller 1041 in the branch distribution circuit can be used to adjust the power supply parameters in the branch distribution circuit, without the need to make large-scale changes to the entire vehicle power distribution device 1, improving the flexibility of the system.

[0057] In addition, in this embodiment, as a preferred implementation form, as shown in the structure, Figure 2 The vehicle power distribution device 1 further includes multiple second controllers 1041 connected to the first controller 104, the second controllers 1041 correspond to the branch distribution circuits one by one, and each branch distribution circuit is provided with a control switch 1042, and each control switch 1042 is connected to the corresponding second controller 1041.

[0058] The advantage of such an arrangement is that the second controller 1041 can flexibly turn on or off the corresponding load according to specific needs, reducing the burden of the first controller 104, thereby improving the stability and efficiency of the vehicle power distribution device 1, and in the case of a problem with a certain branch power distribution circuit, the corresponding second controller 1041 can immediately take measures to disconnect the control switch 1042 and isolate the branch power distribution circuit, without affecting the operation of other branch power distribution circuits, not only protecting the rest of the vehicle power distribution device 1 from potential damage, but also further enhancing the safety performance of the entire automobile electrical system. In addition, in order to facilitate the distinction between the control signal paths of the first controller 104-second controller 1041-control switch 1042, the control signal is shown in the form of a dashed line segment in the embodiment. Figure 2

[0059] Furthermore, in the embodiment, as a preferred implementation form, the control switch 1042 includes at least one of a metal semiconductor field effect transistor, a relay, a high-side drive chip, a high-power drive chip, and an electronic fuse switch arranged in the branch power distribution circuit. Among them, the metal semiconductor field effect transistor has high reliability and service life, so that the control switch 1042 can realize fast response, which helps to reduce power loss and can allow more accurate control of power distribution.

[0060] In addition, in the embodiment, as a preferred implementation form, as shown in Figure 1 Each second controller 1041 is integrated with a voltage detection part, which is used to detect the voltage in the corresponding branch power distribution circuit. The voltage detection part can be at least one of a resistor divider, a Hall effect sensor, and a voltage monitor. By real-time monitoring of the voltage state of the branch power distribution circuit through the voltage detection part, it can be ensured that the voltage is kept within a safe range. Once an abnormality (such as overvoltage or undervoltage) occurs, measures can be taken immediately to prevent damage to the first load 1011 or the second load 1021 and cause a safety accident.

[0061] In the embodiment, as a preferred implementation form, as shown in Figure 1 The second controller 1041 is integrated with a current detection part, which is used to detect the current in the corresponding branch power distribution circuit. Through the current detection part, the current condition in each branch power distribution circuit can be monitored in real time, which helps to discover abnormal conditions such as overload and short circuit in the branch power distribution circuit in a timely manner to prevent damage to equipment or cause a safety accident.

[0062] ​In a preferred embodiment, the second controller 1041 is integrated with a temperature sensor for detecting the temperature of the corresponding first load 1011 or second load 1021. By continuously monitoring the temperature of the corresponding first load 1011 or second load 1021, when the temperature of a certain load rises due to abnormal conditions (such as overload, short circuit, poor contact, etc.), the temperature sensor can quickly detect such changes, and once the temperature of the load exceeds the set safety range, the temperature sensor will send a signal to the system, and then immediately issue an alarm, so that potential problems can be warned before they become serious faults, thereby increasing the reliability and safety of the entire electrical system, reducing the risk of fire and other safety hazards. The selection of this integrated second controller also helps to save space.

[0063] Embodiment Two

[0064] The present embodiment relates to a vehicle power supply system, which comprises a power supply device 2 and a vehicle power distribution device 1 of embodiment one connected with the power supply device 2.

[0065] In addition, in the present embodiment, as a preferred embodiment, as shown in Figure 1 the power supply device 2 comprises a battery 201 and a charging module 202 for charging the battery 201, and the battery 201 and the charging module 202 are connected in parallel and are both connected with the vehicle power distribution device 1.

[0066] The charging module 202 can not only provide power to the vehicle power distribution device 1, but also charge the battery 201. In the case that the charging module 202 fails to supply power to the vehicle power distribution device 1, the battery 201 can supply power to the vehicle power distribution device 1 due to the parallel working of the charging module 202 and the battery 201. The switching process is smooth and uninterrupted, and users will not feel any service interruption or performance fluctuations caused by the switching of power sources, thereby enhancing the flexibility and reliability of the vehicle power supply system.

[0067] Specifically, in a traditional fuel vehicle, the charging module 202 can be composed of an alternator. When the fuel vehicle is running, the engine drives to generate alternating current, which is then converted into direct current by a rectifier to provide voltage to the vehicle power distribution device 1 and charge the battery 201. In an electric vehicle or a hybrid vehicle, the charging module 202 can be integrated in an inverter or other power electronic equipment. When the electric vehicle or hybrid vehicle is running, the electric motor / generator works in reverse mode (i.e. regenerative braking) to generate electric energy to charge the high-voltage battery. In addition, the battery 201 of the power supply device 2 can be an economical lead-acid battery in a traditional fuel vehicle, and a lithium-ion battery with high energy density and light weight in an electric vehicle.

[0068] Embodiment Three

[0069] The embodiment relates to a vehicle provided with the vehicle power supply system of the second embodiment, and the power supply system can ensure smooth power supply at the moment of engine starting or during driving, does not affect the normal operation of the vehicle electronic equipment due to power switching, and brings a more smooth driving experience to users.

[0070] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A vehicle power distribution device for distributing electrical energy from a power supply device (2) to a first load (1011) and a second load (1021), characterized in that: The vehicle power distribution device (1) includes a first power distribution circuit (101) and a second power distribution circuit (102) connected in parallel. At least one of the first power distribution circuit (101) and the second power distribution circuit (102) is provided with two voltage conversion units (103), and the two voltage conversion units (103) are arranged in parallel; The input terminals of the first power distribution circuit (101) and the second power distribution circuit (102) are both used to connect to the power supply device (2). The output terminal of the first power distribution circuit (101) is used to connect to the first load (1011), and the output terminal of the second power distribution circuit (102) is used to connect to the second load (1021).

2. The vehicle power distribution device according to claim 1, characterized in that: It also includes the first controller (104); Each of the voltage conversion units (103) includes a DC-DC converter, and each DC-DC converter is connected to the first controller (104).

3. The vehicle power distribution device according to claim 2, characterized in that: Both the first load (1011) and the second load (1021) are multiple; At least one of the first power distribution circuit (101) and the second power distribution circuit (102) includes a main distribution circuit equipped with the DC-DC converter, and a plurality of branch power distribution circuits connected in parallel to one end of the main distribution circuit. The other end of each of the main distribution circuits is used to connect to the power supply device (2); the branch distribution circuits in the first power distribution circuit (101) correspond one-to-one with the first load (1011) and are connected accordingly; the branch distribution circuits in the second power distribution circuit (102) correspond one-to-one with the second load (1021) and are connected accordingly.

4. The vehicle power distribution device according to claim 3, characterized in that: It also includes a plurality of second controllers (1041) connected to the first controller (104), and each of the second controllers (1041) corresponds to one of the distributed power supply circuits; Each of the sub-distribution power circuits is provided with a control switch (1042), and each of the control switches (1042) is connected to the corresponding second controller (1041).

5. The vehicle power distribution device according to claim 4, characterized in that: The control switch (1042) includes at least one of a metal-semiconductor field-effect transistor, a relay, a high-side drive chip, and an electronic fuse switch.

6. The vehicle power distribution device according to claim 4, characterized in that: Each of the second controllers (1041) integrates a voltage detection unit, which is used to detect the voltage in the corresponding sub-distribution power circuit.

7. The vehicle power distribution device according to claim 4, characterized in that: Each of the second controllers (1041) integrates a current detection unit, which is used to detect the current in the corresponding sub-controller circuit; and / or, Each of the second controllers (1041) integrates a temperature sensor, which is used to detect the temperature of the corresponding first load (1011) or second load (1021).

8. A vehicle power supply system, characterized in that: It includes a power supply device (2) and a vehicle power distribution device (1) connected to the power supply device (2) as described in any one of claims 1-7.

9. The vehicle power supply system according to claim 8, characterized in that: The power supply device (2) includes a storage battery (201) and a charging module (202) for charging the storage battery (201). The storage battery (201) and the charging module (202) are connected in parallel and are both connected to the vehicle power distribution device (1).

10. A vehicle, characterized in that: The vehicle is equipped with a vehicle power supply system as described in claim 8 or 9.

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