A vehicle dual battery system and a pure electric vehicle

Abstract

The utility model relates to a kind of vehicle double battery system and pure electric vehicle, the vehicle double battery system includes: DC-DC converter, main battery, auxiliary battery and main circuit, one end of the main circuit is connected with the DC-DC converter, its other end is as whole car power supply mouth;The main battery is connected with the main circuit by main line, normally closed contactor is installed on the main line;The auxiliary battery is connected with the main circuit by auxiliary line, normally open contactor is installed on the auxiliary line.The utility model has the beneficial effect to provide a kind of double battery system, the circuit therein is reasonable in design, the problem that the danger warning light cannot be opened or the door cannot be opened due to collision can be effectively solved, and the circuit applicability is strong, and it can be applicable to conventional energy and new energy passenger car or commercial vehicle.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, specifically to a dual-battery system for vehicles and a pure electric vehicle. Background Technology

[0002] In pure electric passenger vehicles, in addition to the high-voltage power battery that drives the vehicle, a 12-volt low-voltage battery is also provided. This low-voltage system plays a crucial role, supplying power to a series of core electrical devices related to vehicle handling and safety, including the vehicle's controllers (such as VCU, BMS, MCU), power steering system, brake assist system, vehicle stability system, lighting system, airbag controller, and in-vehicle entertainment and navigation system. It can be considered that the stability of the 12-volt low-voltage system directly determines whether the vehicle can operate safely and reliably.

[0003] However, the currently widely adopted low-voltage power supply scheme with a single path and a single battery has the following inherent defects and systemic risks.

[0004] 1. In the event of a collision, the 12-volt low-voltage battery may be damaged, making it impossible to turn on the hazard lights or even open the doors. 2. When the 12-volt low-voltage battery ages or is in extremely cold conditions, the vehicle may fail to start due to insufficient power supply.

[0005] 3. Limitations of existing redundancy schemes: (1) Supercapacitor solution: Supercapacitors are used as instantaneous power supplements. Their advantages are long cycle life and high power density, but their energy density is low and they cannot maintain power supply for a long time. It is difficult to support the vehicle to safely glide from high speed to stop and complete a series of necessary operations such as turning on the hazard lights and turning on the headlights.

[0006] (2) Dual battery solution: Two independent systems, which are difficult to control and costly. Utility Model Content

[0007] This utility model addresses the technical problems existing in the prior art by providing a dual-battery system for vehicles and a pure electric vehicle.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A vehicle dual-battery system includes: a DC-DC converter, a main battery, an auxiliary battery, and a main circuit, wherein one end of the main circuit is connected to the DC-DC converter, and the other end serves as a power supply port for the entire vehicle; The main battery is connected to the main circuit via a main line, and a normally closed contactor is installed on the main line; the auxiliary battery is connected to the main circuit via an auxiliary line, and a normally open contactor is installed on the auxiliary line.

[0009] The beneficial effects of this utility model are as follows: The working principle and triggering logic are as follows: 1. Normal vehicle operation: The normally closed contactor does not work, the contacts are normally closed, the main battery supplies power to the outside through the normally closed contacts, and the DC-DC converter can also replenish the main battery through the normally closed contacts. The normally open contactor is also not working, and the DC-DC converter cannot replenish the auxiliary battery.

[0010] 2. Auxiliary battery charging: After the vehicle starts normally, when the energy management controller detects that the auxiliary battery is low on energy and the main battery is high on energy, the energy management controller first controls the normally closed contactor to open, and then controls the normally open contactor to close. The DC-DC converter supplies power to the vehicle and charges the auxiliary battery at the same time. When the vehicle has a high current request, the auxiliary battery can also discharge to the vehicle through the normally open contactor contacts; after charging is completed, the vehicle returns to normal operating status.

[0011] 3. Assisted start: When the main battery is aging or in extremely cold conditions, the main battery is insufficient to support the vehicle to start. At this time, the auxiliary battery will simultaneously supply power to the whole vehicle through the unidirectional step-down component. Once the vehicle has started, the DC-DC converter begins to operate, the voltage rises, and the auxiliary battery no longer supplies power.

[0012] This utility model provides a dual-battery system with a reasonable circuit design that can effectively solve the problem of hazard warning lights not turning on or doors not opening due to collisions. The circuit has strong applicability and can be used in conventional energy and new energy passenger or commercial vehicles.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the auxiliary circuit is connected to the main circuit via a step-down circuit, which is distributed in parallel with the normally open contactor; a unidirectional step-down component is installed on the step-down circuit.

[0015] The beneficial effects of adopting the above-mentioned further solution are as follows: The working principle and triggering logic are as follows: 1. Normal vehicle operation: The normally closed contactor does not work, the contacts are normally closed, the main battery supplies power to the outside through the normally closed contacts, and the DC-DC converter can also replenish the main battery through the normally closed contacts. The normally open contactor is also not working, so the DC-DC converter cannot replenish the auxiliary battery. Simultaneously, due to the action of the unidirectional step-down converter, the auxiliary battery cannot supply power externally. No current flows through the unidirectional step-down converter throughout the entire process.

[0016] 2. Auxiliary battery charging: After the vehicle starts normally, when the energy management controller detects that the auxiliary battery is low on energy and the main battery is high on energy, the energy management controller first controls the normally closed contactor to open, and then controls the normally open contactor to close. The DC-DC converter supplies power to the vehicle and charges the auxiliary battery at the same time. When the vehicle requests a large current, the auxiliary battery can also discharge to the vehicle through the normally open contactor contacts; after charging is completed, the vehicle returns to its normal operating state. No current flows through the unidirectional step-down component throughout the entire process.

[0017] 3. Assisted start: When the main battery is aging or in extremely cold conditions, the main battery is insufficient to support the vehicle to start. At this time, the auxiliary battery will simultaneously supply power to the whole vehicle through the unidirectional step-down component. Once the vehicle has started, the DC-DC converter begins to operate, and the voltage rises. At this point, the auxiliary battery no longer supplies power. The unidirectional buck converter only has current flowing through it during startup.

[0018] 4. Emergency Power Supply: In the event of a serious collision and damage to the main battery or power supply circuit, the auxiliary battery can supply power to the vehicle seamlessly and without delay through a one-way step-down component.

[0019] Furthermore, the unidirectional step-down component is a diode.

[0020] The advantage of adopting the above-mentioned further solution is that it is more reasonable to use diodes in the unidirectional step-down component. Diodes have unidirectional conductivity. When forward conduction is on, the current flows from the anode to the cathode, and when reverse cutoff is off, almost no current flows, which is equivalent to the on and off of a switch.

[0021] Furthermore, the unidirectional step-down component is a transistor.

[0022] The advantage of adopting the above-mentioned further scheme is that the transistor can be used as an electronic switch, with its on and off states controlled by the base current. In digital circuits, it is cut off (switch open) when the base current is zero and saturates (switch closed) when the current is sufficient. It is commonly used in logic circuits and power supply control. Furthermore, it also includes a vehicle energy management controller, wherein the normally closed contactor and / or the normally open contactor are respectively connected to the vehicle energy management controller via control lines.

[0023] The advantages of adopting the above-mentioned further solution are its simple structure. The use of a vehicle energy management controller is more reasonable. By using the vehicle energy management controller to control the closing and opening of the normally closed contactor and the normally open contactor, energy efficiency is effectively improved, power distribution is optimized, safety is enhanced, and intelligent coordination is achieved. It is a key component for the efficient operation of new energy vehicles.

[0024] Furthermore, the main battery and / or the auxiliary battery and / or the DC-DC converter are respectively connected to the vehicle energy management controller via a communication bus.

[0025] The advantages of adopting the above-mentioned further solution are that it has a simple structure and reasonable design. By using the vehicle energy management controller to monitor the energy of the main battery, auxiliary battery and DC-DC converter, it can effectively improve energy efficiency, optimize power distribution, enhance safety and intelligent coordination, and is a key component for the efficient operation of new energy vehicles.

[0026] Furthermore, the main battery is a 12V main battery.

[0027] The advantages of adopting the above-mentioned further solution are that the structure is simple, and it is more reasonable to use a 12V main battery, which ensures the normal operation of the vehicle under special circumstances.

[0028] Furthermore, the auxiliary battery is a 12V auxiliary battery.

[0029] The advantages of adopting the above-mentioned further solution are that the structure is simple, and it is more reasonable to use a 12V auxiliary battery, which ensures the normal operation of the vehicle under special circumstances.

[0030] Furthermore, it also includes a vehicle grounding wire, one end of which is connected to the DC-DC converter, and the other end is used for grounding; the main battery, the auxiliary battery, the normally closed contactor, and the normally open contactor are respectively connected to the vehicle grounding wire through lines.

[0031] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. Each component is grounded using the vehicle's grounding wire, which ensures electrical safety, prevents leakage and electric shock, protects the equipment from electromagnetic interference, and provides a discharge path when the current is abnormal.

[0032] This utility model also relates to a pure electric vehicle, including the vehicle dual-battery system described above.

[0033] The beneficial effect of adopting the above-mentioned further solutions is that this utility model also relates to a pure electric vehicle, in which the circuit design is reasonable and can effectively solve the problem that the hazard warning lights cannot be turned on or the doors cannot be opened due to a collision. The circuit has strong applicability and can be applied to conventional energy and new energy passenger vehicles or commercial vehicles. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the present invention.

[0035] The attached diagram lists the components represented by each number as follows: 1. DC-DC converter; 2. Main battery; 3. Auxiliary battery; 4. Main circuit; 5. Normally closed contactor; 6. Normally open contactor; 7. Unidirectional step-down component; 8. Vehicle energy management controller; 9. Vehicle grounding wire. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0039] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0040] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0041] Example 1 like Figure 1 As shown, this embodiment provides a vehicle dual-battery system, including: a DC-DC converter 1, a main battery 2, an auxiliary battery 3, and a main circuit 4. One end of the main circuit 4 is connected to the DC-DC converter 1, and the other end serves as the vehicle power supply port. The main battery 2 is connected to the main circuit 4 via a main line, and a normally closed contactor 5 is installed on the main line; the auxiliary battery 3 is connected to the main circuit 4 via an auxiliary line, and a normally open contactor 6 is installed on the auxiliary line.

[0042] The working principle and triggering logic are as follows: 1. Normal vehicle operation: Normally closed contactor 5 does not work, the contacts are normally closed, the main battery 2 supplies power to the outside through the normally closed contacts, and at the same time the DC-DC converter 1 can also replenish the main battery through the normally closed contacts. Normally open contactor 6 is also not working, and DC-DC converter 1 cannot replenish power to auxiliary battery 3.

[0043] 2. Auxiliary battery 3 charging: After the vehicle starts normally, when the energy management controller detects that the auxiliary battery 3 has insufficient energy and the main battery has sufficient energy, the energy management controller first controls the normally closed contactor 5 to open, and then controls the normally open contactor 6 to close. At the same time, the DC-DC converter 1 supplies power to the whole vehicle and charges the auxiliary battery 3. When the vehicle has a high current request, the auxiliary battery 3 can also discharge to the vehicle through the normally open contactor 6; after charging is completed, it returns to the normal operating state of the vehicle.

[0044] 3. Assisted start: When the main battery 2 is old or in extremely cold conditions, the main battery 2 is insufficient to support the vehicle to start. At this time, the auxiliary battery 3 will simultaneously supply power to the whole vehicle through the unidirectional step-down component. Once the vehicle has started, DC-DC converter 1 begins to operate, and the voltage rises. At this point, auxiliary battery 3 no longer supplies power to the outside.

[0045] Based on the above scheme, the DC-DC converter 1, main battery 2, auxiliary battery 3, main circuit 4, normally closed contactor 5 and normally open contactor 6 adopt existing technologies, and their specific structures and principles will not be described in detail here.

[0046] In addition, the DC-DC converter in a pure electric vehicle is a core power electronic device responsible for converting the high-voltage DC power (such as 400V) from the power battery into low-voltage DC power (such as 12V / 48V) to power the vehicle's low-voltage systems (such as lights, air conditioning, and vehicle electronics) and to charge the low-voltage battery.

[0047] This embodiment provides a dual-battery system with a reasonable circuit design that can effectively solve the problem of hazard warning lights not turning on or doors not opening due to collisions. The circuit has strong applicability and can be used in conventional energy and new energy passenger vehicles or commercial vehicles.

[0048] Example 2 Based on Embodiment 1, in this embodiment, the auxiliary circuit is connected to the main circuit 4 through a step-down circuit, and the step-down circuit is distributed in parallel with the normally open contactor 6; a unidirectional step-down component 7 is installed on the step-down circuit.

[0049] The working principle and triggering logic are as follows: 1. Normal vehicle operation: Normally closed contactor 5 does not work, the contacts are normally closed, the main battery 2 supplies power to the outside through the normally closed contacts, and at the same time the DC-DC converter 1 can also replenish the main battery 2 through the normally closed contacts. Normally open contactor 6 is also not working, DC-DC converter 1 cannot replenish power to auxiliary battery 3, and at the same time, due to the action of unidirectional step-down component 7, auxiliary battery 3 cannot supply power to the outside. No current flows through unidirectional step-down component 7 throughout the entire process.

[0050] 2. Auxiliary battery 3 charging: After the vehicle starts normally, when the energy management controller detects that the auxiliary battery 3 is low on energy and the main battery 2 is high on energy, the energy management controller first controls the normally closed contactor 5 to open, and then controls the normally open contactor 6 to close. At the same time, the DC-DC converter 1 supplies power to the whole vehicle and charges the auxiliary battery 3. When the vehicle requests a large current, the auxiliary battery 3 can also discharge to the vehicle through the normally open contactor 6; after charging is completed, it returns to the normal operating state of the vehicle. No current flows through the unidirectional step-down component 7 throughout the entire process.

[0051] 3. Assisted start: When the main battery 2 is old or in extremely cold conditions, the main battery 2 is insufficient to support the vehicle to start. At this time, the auxiliary battery 3 will simultaneously supply power to the whole vehicle through the one-way step-down component 7. Once the vehicle has started, the DC-DC converter 1 begins to operate, and the voltage rises. At this point, the auxiliary battery 3 no longer supplies power. The unidirectional buck converter 7 only has current flowing through it during startup.

[0052] 4. Emergency power supply: In the event of a serious collision, if the main battery 2 or the power supply circuit is damaged, the auxiliary battery 3 will supply power to the vehicle seamlessly and without delay through the unidirectional step-down component 7.

[0053] Preferably, in this embodiment, the introduction of a unidirectional step-down component (which may be a diode, a diode sequence, or other power device) can effectively control the discharge timing of the auxiliary battery.

[0054] Example 3 Based on Embodiment 2, in this embodiment, the unidirectional step-down component 7 is a diode.

[0055] Using a diode is more reasonable for the unidirectional step-down component 7. Diodes have unidirectional conductivity. When forward conducting, the current flows from the anode to the cathode, and when reverse cut off, almost no current flows, which is equivalent to the on and off of a switch.

[0056] Based on the above scheme, the diodes used are based on existing technology, and their specific structure and principle will not be described in detail here.

[0057] Example 4 Based on Example 2, in this example, the unidirectional step-down component 7 is a transistor.

[0058] Transistors can be used as electronic switches, controlling their on / off state through base current. In digital circuits, they are cut off (switch open) when the base current is zero and saturated (switch closed) when the current is sufficient. They are commonly used in logic circuits and power supply control. Based on the above scheme, the transistors used are based on existing technology, and their specific structure and principle will not be described in detail here.

[0059] The above embodiments 3 and 4 are parallel schemes.

[0060] Example 5 Based on the above embodiments, this embodiment also includes a vehicle energy management controller 8, wherein the normally closed contactor 5 and / or the normally open contactor 6 are respectively connected to the vehicle energy management controller 8 through control lines.

[0061] The solution has a simple structure, and it is more reasonable to use the vehicle energy management controller 8 here. The vehicle energy management controller 8 controls the closing and opening of the normally closed contactor 5 and the normally open contactor 6, which effectively improves energy efficiency, optimizes power distribution, enhances safety and intelligent coordination, and is a key component for the efficient operation of new energy vehicles.

[0062] Based on the above scheme, the vehicle energy management controller 8 adopts existing technology, and its specific structure and principle will not be described in detail here.

[0063] Furthermore, the vehicle energy management controller 8 rationally allocates the activation timing of the two contactors, achieving seamless operation. The auxiliary battery discharge occurs infrequently; most of the time, the vehicle is in normal operating condition. The contactors operate for short periods, resulting in a long lifespan.

[0064] Example 6 Based on Example 5, in this example, the main battery 2 and / or the auxiliary battery 3 and / or the DC-DC converter 1 are respectively connected to the vehicle energy management controller 8 via a communication bus.

[0065] This solution has a simple structure and reasonable design. It uses the vehicle energy management controller 8 to monitor the energy of the main battery 2, auxiliary battery 3 and DC-DC converter 1, which effectively improves energy efficiency, optimizes power distribution, enhances safety and intelligent collaboration, and is a key component for the efficient operation of new energy vehicles.

[0066] Example 7 Based on the above embodiments, in this embodiment, the main battery 2 is a 12V main battery.

[0067] The solution has a simple structure, and it is reasonable to use a 12V main battery for the second main battery, as this voltage ensures the normal operation of the vehicle under special circumstances.

[0068] Example 8 Based on the above embodiments, in this embodiment, the auxiliary battery 3 is a 12V auxiliary battery.

[0069] The solution has a simple structure, and it is reasonable to use a 12V auxiliary battery, which ensures the normal operation of the vehicle under special circumstances.

[0070] Example 9 Based on the above embodiments, this embodiment also includes a vehicle grounding wire 9, one end of which is connected to the DC-DC converter 1, and the other end is used for grounding; the main battery 2, the auxiliary battery 3, the normally closed contactor 5 and the normally open contactor 6 are respectively connected to the vehicle grounding wire 9 through lines.

[0071] The solution has a simple structure and reasonable design. Each component is grounded using the vehicle's grounding wire to ensure electrical safety, prevent leakage and electric shock, protect the equipment from electromagnetic interference, and provide a discharge path in case of abnormal current.

[0072] Example 10 Based on the above embodiments, this embodiment also provides a pure electric vehicle, including the vehicle dual-battery system described above.

[0073] This embodiment also relates to a pure electric vehicle, in which the circuit design is reasonable and can effectively solve the problem of hazard warning lights not turning on or doors not opening due to collision. The circuit has strong applicability and can be applied to conventional energy and new energy passenger vehicles or commercial vehicles.

[0074] This utility model provides a dual-battery system for vehicles and a pure electric vehicle, the working principle and triggering logic of which are as follows: 1. Normal vehicle operation: Normally closed contactor 5 does not work, the contacts are normally closed, the main battery 2 supplies power to the outside through the normally closed contacts, and at the same time the DC-DC converter 1 can also replenish the main battery 2 through the normally closed contacts. Normally open contactor 6 is also not working, DC-DC converter 1 cannot replenish power to auxiliary battery 3, and at the same time, due to the action of unidirectional step-down component 7, auxiliary battery 3 cannot supply power to the outside. No current flows through unidirectional step-down component 7 throughout the entire process.

[0075] 2. Auxiliary battery 3 charging: After the vehicle starts normally, when the energy management controller detects that the auxiliary battery 3 is low on energy and the main battery 2 is high on energy, the energy management controller first controls the normally closed contactor 5 to open, and then controls the normally open contactor 6 to close. At the same time, the DC-DC converter 1 supplies power to the whole vehicle and charges the auxiliary battery 3. When the vehicle requests a large current, the auxiliary battery 3 can also discharge to the vehicle through the normally open contactor 6; after charging is completed, it returns to the normal operating state of the vehicle. No current flows through the unidirectional step-down component 7 throughout the entire process.

[0076] 3. Assisted start: When the main battery 2 is old or in extremely cold conditions, the main battery 2 is insufficient to support the vehicle to start. At this time, the auxiliary battery 3 will simultaneously supply power to the whole vehicle through the one-way step-down component 7. Once the vehicle has started, the DC-DC converter 1 begins to operate, and the voltage rises. At this point, the auxiliary battery 3 no longer supplies power. The unidirectional buck converter 7 only has current flowing through it during startup.

[0077] 4. Emergency power supply: In the event of a serious collision, if the main battery 2 or the power supply circuit is damaged, the auxiliary battery 3 will supply power to the vehicle seamlessly and without delay through the unidirectional step-down component 7.

[0078] This utility model provides a dual-battery system for vehicles and a pure electric vehicle, which has the following advantages: 1. The parts are highly versatile, and all selected parts are standard components; 2. The circuit has strong applicability and can be used in conventional energy and new energy passenger or commercial vehicles; 3. It can effectively solve the problem of hazard warning lights not turning on or doors not opening due to collisions.

[0079] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of this utility model is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A dual-battery system for vehicles, characterized in that, include: The system comprises a DC-DC converter (1), a main battery (2), an auxiliary battery (3), and a main circuit (4), one end of which is connected to the DC-DC converter (1), and the other end of which serves as the power supply port for the vehicle. The main battery (2) is connected to the main circuit (4) via the main line, and a normally closed contactor (5) is installed on the main line; the auxiliary battery (3) is connected to the main circuit (4) via the auxiliary line, and a normally open contactor (6) is installed on the auxiliary line.

2. The vehicle dual-battery system according to claim 1, characterized in that, The auxiliary circuit is connected to the main circuit (4) via a step-down circuit, and the step-down circuit is distributed in parallel with the normally open contactor (6); a unidirectional step-down component (7) is installed on the step-down circuit.

3. The vehicle dual-battery system according to claim 2, characterized in that, The unidirectional step-down component (7) is a diode.

4. The vehicle dual-battery system according to claim 2, characterized in that, The unidirectional step-down component (7) is a transistor.

5. The vehicle dual-battery system according to any one of claims 1-4, characterized in that, It also includes a vehicle energy management controller (8), wherein the normally closed contactor (5) and / or the normally open contactor (6) are respectively connected to the vehicle energy management controller (8) through control lines.

6. The vehicle dual-battery system according to claim 5, characterized in that, The main battery (2) and / or the auxiliary battery (3) and / or the DC-DC converter (1) are respectively connected to the vehicle energy management controller (8) via a communication bus.

7. The vehicle dual-battery system according to any one of claims 1-4, characterized in that, The main battery (2) is a 12V main battery.

8. The vehicle dual-battery system according to any one of claims 1-4, characterized in that, The auxiliary battery (3) is a 12V auxiliary battery.

9. The vehicle dual-battery system according to any one of claims 1-4, characterized in that, It also includes a vehicle grounding wire (9), one end of which is connected to the DC-DC converter (1), and the other end is used for grounding; the main battery (2), the auxiliary battery (3), the normally closed contactor (5) and the normally open contactor (6) are respectively connected to the vehicle grounding wire (9) through lines.

10. A pure electric vehicle, characterized in that, Including the vehicle dual-battery system as described in any one of claims 1-9.

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