Power supply device for new energy automobile and electric automobile

Abstract

The utility model discloses a power supply device for a new energy automobile and an electric automobile, the power supply device is integrated with a high-voltage input port, a low-voltage output port, a direct current converter and a low-voltage storage battery, and the connection between a high-voltage power battery and a low-voltage load in the new energy automobile is simplified. Wherein the power supply device receives high-voltage direct-current electric energy through the high-voltage input port and is connected with the low-voltage storage battery through the direct-current converter, and the low-voltage storage battery is connected with the low-voltage load through the low-voltage output port and outputs the direct-current electric energy, so that the high-voltage power battery supplies power to the low-voltage load. According to the power supply device, the direct-current converter and the low-voltage storage battery are integrally arranged, so that a connecting wire harness between the direct-current converter and the low-voltage storage battery is shortened, internal wiring of an automobile is clarified, and space is saved. Power is supplied to the low-voltage load through the low-voltage storage battery, a connecting wire harness between the low-voltage load and the direct-current converter is omitted, electric connecting materials are saved, and the wiring space in an automobile is optimized.

Description

Technical Field

[0001] The present application belongs to the technical field of electric vehicle power devices, and in particular, relates to a power supply device for new energy vehicles and an electric vehicle. Background Art

[0002] With the iteration and update of traditional cars and the continuous development of new energy vehicles, cars are usually equipped with a variety of auxiliary function systems, such as audio and video, entertainment, lighting and other systems. These systems are generally powered by a low-voltage power supply of 12 to 24V. The output voltage of the power battery equipped in new energy vehicles is much higher than 24V and cannot directly supply power to the auxiliary function system.

[0003] New energy vehicles are equipped with a DC to DC converter (DCDC), which can convert the high-voltage output power of the power battery into a low-voltage output power. The DC converter is connected to the auxiliary function system to solve the power supply problem of the auxiliary function system. Some models are also equipped with a low-voltage battery, which can be used as a backup power supply for the auxiliary function system. The connection between the DC converter, the low-voltage battery and the auxiliary function system increases the difficulty of the vehicle's internal layout and increases the vehicle's development and design costs. Summary of the invention

[0004] The embodiments of the present application provide a power supply device for a new energy vehicle and an electric vehicle, which solve the problem that the internal layout of existing new energy vehicles is chaotic and prone to interference.

[0005] In the first aspect, an embodiment of the present application provides a power supply device for a new energy vehicle, wherein the power supply device integrates a high-voltage input port, a low-voltage output port, a DC converter and a low-voltage battery. The power supply device receives high-voltage DC power through the high-voltage input port and is connected to the low-voltage battery through the DC converter; the power supply device is connected to a low-voltage load through the low-voltage output port and outputs low-voltage DC power.

[0006] In some embodiments, the power supply device further includes a shell, the DC converter and the low-voltage battery are integrated inside the shell, and the high-voltage input port and the low-voltage output port are integrated in the shell.

[0007] In some embodiments, the power supply device further comprises a support foot fixedly connected to the shell, and the shell is fixedly connected to the new energy vehicle via the support foot.

[0008] In some embodiments, the power supply device further includes a cover plate, which is disposed on an opening side of the shell, and the cover plate is detachably connected to the shell.

[0009] In some embodiments, the power supply device is also integrated with a low-voltage communication interface, and the power supply device is communicatively connected to the low-voltage load of the vehicle through the low-voltage communication interface. The power supply device has a first wall and a second wall separated along a first direction, and the low-voltage communication interface is arranged on the first wall.

[0010] In some embodiments, the power supply device also includes a control module, the control module is connected to the low-voltage battery, the control module is connected to the low-voltage communication interface, and the control module is arranged between the low-voltage battery and the low-voltage communication interface in a first direction.

[0011] In some embodiments, the power supply device has a third wall and a fourth wall arranged along the second direction, the third wall is connected to the first wall, and the low-voltage output port includes an output positive pole and an output negative pole, and the output positive pole and the output negative pole are arranged on the third wall.

[0012] In some embodiments, the power supply device also includes a cooling component, the cooling component includes a cooling medium inlet and a cooling medium outlet, the power supply device has a fifth wall and a sixth wall arranged along a third direction, the cooling medium inlet and the cooling medium outlet are arranged on the fifth wall, or the cooling medium inlet and the cooling medium outlet are arranged on the fifth wall and the sixth wall respectively.

[0013] In some embodiments, the power supply device further includes an input control element, and the high-voltage input port is connected to the DC converter through the input control element to control the on / off of the circuit.

[0014] In the second aspect, an embodiment of the present application also provides an electric vehicle, comprising a high-voltage power battery, a low-voltage load and the aforementioned power supply device for new energy vehicles; the high-voltage power battery is connected to the power supply device through the high-voltage input port, and the power supply device is connected to the low-voltage load through the low-voltage output port.

[0015] The power supply device for new energy vehicles in the embodiment of the present application integrates the DC converter and the low-voltage battery, shortens the connection harness between the DC converter and the low-voltage battery, and is conducive to clarifying the internal wiring of the new energy vehicle and saving space. The power supply device supplies power to the low-voltage load through the low-voltage battery, eliminating the connection harness between the low-voltage load and the DC converter, saving electrical connection materials, and optimizing the internal wiring space of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A connection diagram of a power supply device according to some embodiments of the present application;

[0018] Figure 2 A schematic diagram of the structure of a power supply device in some embodiments of the present application;

[0019] Figure 3 Another schematic diagram of the structure of the power supply device in some embodiments of the present application;

[0020] Figure 4 for Figure 3 Schematic diagram of the external structure of the power supply device shown.

[0021] The reference numerals in the specific implementation manner are as follows:

[0022] Power supply device 10;

[0023] Cover plate 110; housing 120; first wall 121; third wall 123; fifth wall 125; support leg 130;

[0024] High voltage input port 210; input control element 220; DC converter 230;

[0025] Low voltage battery 310; output positive electrode 321; output negative electrode 322; low voltage communication interface 330; control module 340;

[0026] Cooling medium inlet 410; Cooling medium outlet 420;

[0027] Breathing valve 510;

[0028] The first direction is Y; the second direction is Z; the third direction is X. DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0031] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0032] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0033] With the iteration and update of traditional cars and the continuous development of new energy vehicles, the auxiliary function systems configured in cars are becoming more and more abundant, such as wipers, lighting, audio and video, entertainment, navigation and other systems, which are generally powered by a low-voltage power supply of 12 to 24V. Taking new energy vehicles as an example, the output voltage of the power battery configured inside new energy vehicles is much higher than 24V, and it is impossible to directly transmit power to the auxiliary function systems inside the car. In response to this, new energy vehicles are equipped with a DC to DC converter (DCDC) in the car. The DC converter can convert the high-voltage output power supply into a low-voltage output power supply. The power battery is connected to the auxiliary function system through the DC converter to realize the power supply of the auxiliary function system in the car.

[0034] For hybrid vehicles, low-voltage batteries are also installed in the vehicle. When the power battery is used as a power source, the power battery can supply power to the low-voltage battery and the auxiliary function system through the DC converter at the same time, so as to realize the charging of the low-voltage battery and the operation of the auxiliary function system; when the power battery is not used as a power source, the low-voltage battery can release its stored electric energy to supply power to the auxiliary function system. In this way, the DC converter needs to be connected to the power battery, the low-voltage battery and the auxiliary function system at the same time, and the auxiliary function system needs to be connected to the DC converter and the low-voltage battery at the same time, and the connection form is cumbersome.

[0035] In the related art, hybrid vehicles arrange the DC converter and the low-voltage battery separately to clarify the direction of the wiring harness. However, on the one hand, the DC converter and the low-voltage battery are two independent devices that occupy the layout space inside the vehicle, increase the difficulty of body layout design and thermal management system design, and increase the cost of vehicle development and design; on the other hand, a large amount of electrical connection materials are consumed between the DC converter, the low-voltage battery and the auxiliary function system, occupying a large amount of wiring space inside the vehicle, increasing the difficulty and confusion of wiring inside the vehicle.

[0036] Based on this, the embodiments of the present application provide a power supply device for new energy vehicles and an electric vehicle, which can solve the problems of low internal space utilization and chaotic layout of existing new energy vehicles.

[0037] The power supply device for new energy vehicles and the electric vehicle provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0038] See also Figure 1 The present application provides a power supply device 10 for a new energy vehicle. The power supply device 10 integrates a high-voltage input port 210, a low-voltage output port, a DC converter 230 and a low-voltage battery 310, which simplifies the connection between the high-voltage power battery and the low-voltage load in the new energy vehicle. The power supply device 10 receives high-voltage DC power through the high-voltage input port 210, and is connected to the low-voltage battery 310 through the DC converter 230. The low-voltage battery 310 is connected to the low-voltage load through the low-voltage output port and outputs DC power, thereby realizing the power supply from the high-voltage power battery to the low-voltage load.

[0039] Among them, the high-voltage input port 210 is used to connect the high-voltage wiring harness and receive the high-voltage DC power transmitted from the high-voltage power battery to the power supply device 10. The high-voltage input port 210 is connected to the DC converter 230 through the high-voltage wiring harness to transmit the high-voltage DC power to the DC converter 230. The DC converter 230 converts the received high-voltage DC power into low-voltage DC power and transmits it to the low-voltage battery 310 to charge the low-voltage battery 310, or supplies power to the low-voltage load through the low-voltage battery 310 and the low-voltage output port. The low-voltage output port is connected to the low-voltage load through the low-voltage wiring harness to realize the output of the low-voltage working voltage.

[0040] The DC converter 230 and the low-voltage battery 310 are integrated, which shortens the spatial distance between the DC converter 230 and the low-voltage battery 310, thereby reducing the use of electrical connection consumables. On the one hand, it optimizes the wiring space inside the new energy vehicle and reduces the degree of wiring harness confusion; on the other hand, it simplifies the design difficulty of the vehicle body and thermal management system, which is conducive to the control of the development and design costs of new energy vehicles.

[0041] The power supply device 10 provides a connection method between a DC converter 230, a low-voltage battery 310 and a low-voltage load. The DC converter 230 provides a low-voltage working voltage to the low-voltage load through the low-voltage battery 310, solves the power supply of the low-voltage load when the DC converter 230 is not directly connected to the low-voltage load, eliminates the connection harness between the low-voltage load and the DC converter 230, optimizes the wiring space inside the car and saves electrical connection consumables. The power supply device 10 can realize quick connection with the high-voltage power battery and the low-voltage load through the high-voltage input port 210 and the low-voltage output port, respectively, reducing the difficulty of assembling the battery system of the new energy vehicle.

[0042] See also Figure 2 According to certain embodiments of the present application, the power supply device 10 also includes a shell 120, a housing space is formed inside the shell 120, the DC converter 230 and the low-voltage battery 310 are integrated in the housing space, and the high-voltage input port 210 and the low-voltage output port are integrated in the shell 120.

[0043] Specifically, the housing 120 is made of insulating material to prevent unexpected electrical conduction between the power supply device 10 and other electrical components in the new energy vehicle.

[0044] Optionally, the housing 120 is detachably connected to the new energy vehicle to enable rapid disassembly and assembly of the power supply device 10 .

[0045] Optionally, the connecting harness is fixed to the housing 120 by means of a cable tie or a buckle.

[0046] Thus, the DC converter 230, the low-voltage battery 310 and the connecting harness are integrated into the housing 120, which improves the integration of the power supply device 10, is conducive to the miniaturization of the structure of the power supply device 10, and saves the internal space of the new energy vehicle.

[0047] See also Figure 3 to Figure 4 According to certain embodiments of the present application, the power supply device 10 further includes a support foot 130 fixedly connected to the shell 120, and the support foot 130 is fixedly connected to the new energy vehicle to achieve fixed installation of the shell 120 and the new energy vehicle.

[0048] Optionally, the support leg 130 can support the power supply device 10 and fix it at a distance from the new energy vehicle, which helps to dissipate heat of the power supply device 10.

[0049] Optionally, the support leg 130 is detachably connected to the new energy vehicle via screws, bolts or other connecting parts.

[0050] Thus, the power supply device 10 is fixedly connected to the new energy vehicle, the stability of the power supply device 10 is improved, and the power supply device 10 is easily assembled to the new energy vehicle.

[0051] According to some embodiments of the present application, the power supply device 10 further includes a cover plate 110 , which is disposed on an open side of the housing 120 .

[0052] Optionally, a folded edge is provided on the opening side of the shell 120 , and the cover plate 110 is fixedly connected to the folded edge of the shell 120 .

[0053] Optionally, the cover plate 110 is detachably connected to the housing 120 .

[0054] Thus, the electrical components of the power supply device 10 are separated from other electrical components in the new energy vehicle by the cover plate 110 and the housing 120, thereby reducing the exposed connection harnesses inside the new energy vehicle and reducing the degree of confusion in the internal layout of the new energy vehicle.

[0055] See also Figure 3 to Figure 4 According to some embodiments of the present application, optionally, the power supply device 10 is further integrated with a low-voltage communication interface 330, and the power supply device 10 is connected to the low-voltage load through the low-voltage communication interface 330. The low-voltage communication interface 330 is provided in the housing 120 and connected to the low-voltage battery 310.

[0056] Alternatively, the low-voltage communication interface 330 is disposed on the cover plate 110 and connected to the low-voltage battery 310 .

[0057] The low voltage communication interface 330 is used for signal transmission between the power supply device 10 and external devices. For example, the low voltage communication interface 330 is connected to the vehicle control unit for communication. The low voltage communication interface 330 can be a serial communication interface, a CAN network interface, a LAN network interface, a USB interface, or other types of communication interfaces.

[0058] Therefore, the power supply device 10 leads out the communication wiring harness through the low-voltage communication interface 330 and communicates with the low-voltage load, reducing the difficulty of communication connection between the low-voltage load and the low-voltage battery 310 and the DC converter 230, and speeding up the communication connection between the power supply device 10 and the low-voltage load.

[0059] In some of the embodiments, the power supply device 10 has a first wall 121 and a second wall arranged along a first direction (e.g., the Y direction in the figure), the low-voltage communication interface 330 is arranged on the first wall 121, and the low-voltage communication interface 330 is arranged through the first wall 121. One end of the low-voltage communication interface 330 located in the accommodating space is connected to the low-voltage battery 310 for communication, and one end of the low-voltage communication interface 330 located outside the accommodating space is connected to the low-voltage load for communication. Figure 4 In some embodiments, the first wall 121 is located in the housing 120 , and the second wall is the cover plate 110 .

[0060] Optionally, the high-voltage input port 210 is arranged on the first wall 121, and the first wall 121 faces the direction of the lines from the power battery and the vehicle control unit. The high-voltage input port 210 and the low-voltage communication interface 330 are arranged on the first wall 121 at the same time to shorten the wiring distance and optimize the wiring space inside the new energy vehicle.

[0061] See also Figure 3 According to some embodiments of the present application, optionally, the power supply device 10 also includes a control module 340, which is used for use status control, thermal management, communication control, etc. of the low-voltage battery 310. The control module 340 is connected to the low-voltage battery 310 through a communication harness, and the control module 340 is connected to the low-voltage communication interface 330 through a communication harness. The control module 340 is arranged between the low-voltage battery 310 and the low-voltage communication interface 330 in a first direction.

[0062] The control module 340 may be a battery energy distribution unit (BDU), which is used to perform control operations such as power distribution, circuit closure, and circuit breaking on the power supply device 10 and electrical components connected to the power supply device 10 .

[0063] Therefore, the control module 340 is used to control the use status and thermal management of the low-voltage battery 310, thereby improving the power safety of the power supply device 10 itself and the new energy vehicle. The control module 340 is arranged between the low-voltage battery 310 and the low-voltage communication interface 330 to shorten the spatial distance between the control module 340 and the low-voltage battery 310, and between the control module 340 and the low-voltage communication interface 330, thereby reducing the connection length of the communication harness, saving wire materials and reducing costs.

[0064] See also Figure 4 According to some embodiments of the present application, optionally, the power supply device 10 has a third wall 123 and a fourth wall arranged along a second direction (for example, the Z direction in the figure), the third wall 123 is connected to the first wall 121, and the low-voltage output port is arranged on the third wall 123.

[0065] Therefore, the low-voltage output port and the low-voltage communication interface 330 are respectively arranged on the connected third wall 123, which, on the one hand, facilitates the electrical connection and communication connection between the power supply device 10 and the low-voltage load, and on the other hand, can distinguish the connection wiring harness from the communication wiring harness, which helps to quickly connect the power supply device 10 with the low-voltage load and between the power supply device 10 and the vehicle control unit.

[0066] In some of the embodiments, optionally, the low-voltage output port includes an output positive electrode 321 and an output negative electrode 322, and the output positive electrode 321 and the output negative electrode 322 are arranged on the third wall 123, and the output positive electrode 321 and the output negative electrode 322 are arranged adjacent to each other, and the output positive electrode 321 and the output negative electrode 322 are simultaneously connected to the low-voltage load to form an electrical path, so that the power supply device 10 supplies power to the low-voltage load.

[0067] As a result, the distance between the output positive electrode 321 and the output negative electrode 322 is shortened, the connection difficulty and wiring harness confusion between the low-voltage output port and the low-voltage battery 310 are reduced, the length of the connection harness is reduced, electrical connection consumables are saved, and costs are reduced.

[0068] According to some embodiments of the present application, optionally, the power supply device 10 further includes a cooling assembly, the cooling assembly is used to connect the accommodating space with the cooling system of the automobile, and the cooling assembly includes a cooling medium inlet 410 and a cooling medium outlet 420 that are connected to each other. The power supply device 10 has a fifth wall 125 and a sixth wall that are arranged along a third direction (for example, the X direction in the figure), and the cooling medium inlet 410 and the cooling medium outlet 420 are arranged on the fifth wall 125 and / or the sixth wall.

[0069] See also Figure 4In some embodiments, the cooling assembly is connected to the liquid cooling system. The cooling medium inlet 410 is connected to the cooling medium outlet 420 through a cooling pipeline, and the cooling pipeline is built into the accommodating space. The liquid cooling medium flows through the cooling medium inlet 410, the cooling pipeline and the cooling medium outlet 420 in sequence and exchanges heat with the DC converter 230, the low-voltage battery 310, etc. to reduce the internal temperature of the power supply device 10. The cooling medium inlet 410 and the cooling medium outlet 420 are arranged on the fifth wall 125. In other optional embodiments, the cooling medium inlet 410 and the cooling medium outlet 420 are arranged on the sixth wall.

[0070] Therefore, the cooling medium inlet 410 and the cooling medium outlet 420 are arranged on the same side to facilitate the connection between the power supply device 10 and the liquid cooling system, shorten the length of the connecting pipeline between the power supply device 10 and the liquid cooling system, and save space inside the car.

[0071] In other embodiments, the cooling assembly is connected to the air cooling system, and the cooling airflow enters the accommodating space through the cooling medium inlet 410 to exchange heat with the power supply device 10, and then flows out through the cooling medium outlet 420. The cooling medium inlet 410 and the cooling medium outlet 420 are respectively arranged on the fifth wall 125 and the sixth wall.

[0072] As a result, the flow path of the cooling airflow in the accommodating space is extended, and the cooling effect of the cooling assembly on the accommodating space and the internal electrical components is improved.

[0073] According to some embodiments of the present application, optionally, the power supply device 10 also includes an input control element 220, and the high-voltage input port 210 is connected to the DC converter 230 through the input control element 220. The input control element 220 controls the on-off of the circuit between the high-voltage input port 210 and the DC converter 230 to control whether the high-voltage power battery supplies power to the power supply device 10.

[0074] In some of the embodiments, optionally, the input control element 220 is a switch tube, which may be a metal-oxide-semiconductor field-effect transistor (MOSFET, also known as MOS tube), and the power supply from the high-voltage power battery to the DC converter 230 is controlled by controlling the on and off of the MOS tube.

[0075] Therefore, the circuit between the high-voltage input port 210 and the DC converter 230 is switched on and off by the input control element 220, thereby controlling whether the high-voltage power battery supplies power to the power supply device 10, thereby realizing the switching of power supply from the high-voltage power battery or the low-voltage battery 310 to the low-voltage load.

[0076] See also Figure 3In some of the embodiments, optionally, in the third direction, the input control element 220 is arranged between the high-voltage input port 210 and the DC converter 230 to shorten the wiring distance between the high-voltage input port 210 and the input control element 220 and between the input control element 220 and the low-voltage battery 310, save electrical connection consumables, and reduce power loss.

[0077] According to some embodiments of the present application, optionally, the first direction, the second direction and the third direction are perpendicular to each other, and the first wall 121, the second wall, the third wall 123, the fourth wall, the fifth wall 125, and the sixth wall together form a rectangular structure, which is convenient for the installation and fixation of the power supply device 10 inside the car.

[0078] In some of these embodiments, optionally, see Figure 4 The fourth wall is used for installing and fixing the power supply device 10 and the new energy vehicle. The side of the fourth wall that is in contact with the new energy vehicle can be set to a flat surface or other surface that can be in contact with the new energy vehicle.

[0079] Optionally, the power supply device 10 further includes a breathable valve 510 , which is arranged on the third wall 123 and opens upwards, so as to help discharge high-temperature gas in the power supply device 10 .

[0080] Based on the same inventive concept, in a second aspect, the embodiments of the present application also provide an electric vehicle, including the power supply device 10 for new energy vehicles provided by any of the aforementioned embodiments, so that the electric vehicle has all the beneficial effects of the above-mentioned power supply device 10.

[0081] The electric vehicle includes a high-voltage power battery and a low-voltage load, and the high-voltage power battery and the low-voltage load are connected through a power supply device 10. The high-voltage power battery is connected to a high-voltage input port 210 of the power supply device 10, and the low-voltage load is connected to a low-voltage output port of the power supply device 10. Thus, the connection harness between the high-voltage power battery and the low-voltage load is simplified, and the wiring space inside the electric vehicle is optimized.

[0082] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0083] It should be understood that in the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0084] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power supply device for new energy vehicles, characterized in that: The power supply device integrates a high-voltage input port, a low-voltage output port, a DC converter and a low-voltage battery. The power supply device receives high-voltage DC power through the high-voltage input port and is connected to the low-voltage battery through the DC converter; the power supply device is connected to a low-voltage load through the low-voltage output port and outputs low-voltage DC power.

2. The power supply device for new energy vehicles according to claim 1, characterized in that: The power supply device further comprises a shell, the DC converter and the low-voltage battery are integrated inside the shell, and the high-voltage input port and the low-voltage output port are integrated in the shell.

3. The power supply device for new energy vehicles according to claim 2, characterized in that: The power supply device also includes a support foot fixedly connected to the shell, and the shell is fixedly connected to the new energy vehicle through the support foot.

4. The power supply device for new energy vehicles according to claim 2, characterized in that: The power supply device further includes a cover plate, which is disposed on the opening side of the shell and is detachably connected to the shell.

5. The power supply device for new energy vehicles according to claim 1, characterized in that: The power supply device is also integrated with a low-voltage communication interface, and the power supply device is communicatively connected to the low-voltage load of the vehicle through the low-voltage communication interface. The power supply device has a first wall and a second wall arranged along a first direction, and the low-voltage communication interface is arranged on the first wall.

6. The power supply device for new energy vehicles according to claim 5, characterized in that: The power supply device also includes a control module, which is connected to the low-voltage battery, and the control module is connected to the low-voltage communication interface. The control module is arranged between the low-voltage battery and the low-voltage communication interface in a first direction.

7. The power supply device for new energy vehicles according to claim 5, characterized in that: The power supply device has a third wall and a fourth wall arranged along the second direction, the third wall is connected to the first wall, and the low-voltage output port includes an output positive electrode and an output negative electrode, and the output positive electrode and the output negative electrode are arranged on the third wall.

8. The power supply device for new energy vehicles according to claim 1, characterized in that: The power supply device also includes a cooling component, which includes a cooling medium inlet and a cooling medium outlet. The power supply device has a fifth wall and a sixth wall arranged along a third direction, and the cooling medium inlet and the cooling medium outlet are arranged on the fifth wall, or the cooling medium inlet and the cooling medium outlet are arranged on the fifth wall and the sixth wall respectively.

9. The power supply device for new energy vehicles according to claim 1, characterized in that: The power supply device further comprises an input control element, through which the high voltage input port is connected to the DC converter and controls the on / off of the circuit.

10. An electric vehicle, characterized in that: include: A power supply device for a new energy vehicle as claimed in any one of claims 1 to 9; a high-voltage power battery, wherein the high-voltage power battery is connected to the power supply device via the high-voltage input port; A low-voltage load, wherein the power supply device is connected to the low-voltage load via the low-voltage output port.

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