A new energy vehicle multi-source system and control method thereof

Abstract

A new energy vehicle multi-source system and a control method thereof belong to the field of new energy vehicle technology. The new energy vehicle multi-source system adds an auxiliary power supply on the basis of the original vehicle's high-voltage architecture, and communicates with the BMS main control modules of the two battery systems through the vehicle control module to obtain the status of the two battery systems. When the comfort electrical accessories need to work, the vehicle control module obtains the SOC, voltage, current, temperature, alarm information and other status of the two battery systems, and gives priority to using the auxiliary power supply to power the comfort electrical accessories, without affecting the power supply of the main drive motor by the power battery. At the lowest cost, it ensures the normal opening of the comfort electrical accessories and the vehicle's cruising range. When the auxiliary power supply is insufficient or faulty, the vehicle control module can switch the power supply to the comfort electrical accessories by controlling the corresponding contactor, preventing the comfort electrical accessories from being unable to open normally in this state, thereby causing serious consequences such as high-temperature failure of the power battery.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and more specifically to a new energy vehicle multi-source system and a control method thereof. Background Art

[0002] When operating in hot summer weather, new energy vehicles require cooling of the passenger compartment and power battery. In cold winter weather, both require heating, and the windows require defrosting. The operation of the thermal management system significantly increases power consumption, reducing vehicle range. A common scenario involves long, long-distance highway traffic jams during holidays. Auxiliary systems, especially air conditioning, drain the power battery of new energy vehicles, forcing them to break down mid-trip. This deters holiday users from using highways or traveling long distances by electric vehicle.

[0003] To address the issue of insufficient driving range in new energy vehicles due to power consumption in auxiliary systems, the current approach is to replace the vehicle with a larger power battery. However, this is expensive and has limited selection, requiring multiple boxes of batteries to be of the same brand and type. To address this issue, we propose a multi-source system control method for new energy vehicles. Summary of the Invention

[0004] The present invention provides a new energy vehicle multi-source system and a control method thereof, aiming to solve the problem that existing new energy vehicles have reduced driving range due to power consumption of auxiliary systems.

[0005] The present invention adopts the following technical solutions:

[0006] A new energy vehicle multi-source system includes a power battery, an auxiliary power supply, a vehicle control module, a power BMS main control module, and an auxiliary source BMS main control module; the power battery circuit is connected in parallel with a DC charging circuit 1, a main drive system branch, a comfort electric accessory branch 1, and an auxiliary drive system branch; the power battery circuit is connected in series with a current detection module 1 and a contactor S1; the DC charging circuit 1 is provided with contactors S2 and S3; the main drive system branch is connected in series with a contactor S4; both ends of the contactor S4 are also connected in parallel with a pre-charge resistor R1 and a pre-charge contactor S5; the comfort electric accessory branch 1 is connected in series with contactors S6 and S7 located on both sides of the comfort electric accessories; and the auxiliary drive system branch is provided with a contactor S8; the auxiliary power supply circuit is connected in parallel with a comfort electric accessory branch 2 and a DC charging circuit 2; the comfort electric accessory branch 2 is connected in series with a contactor located at Contactors S9 and S10 are on both sides of the comfort electrical accessories, and the auxiliary power supply circuit is also connected in series with a current detection module 2 and a main negative contactor S12. The two ends of the main negative contactor S12 are connected in parallel with a pre-charge contactor S11 and a pre-charge resistor R2. Contactors S13 and S14 are provided on the DC charging circuit 2; the contactors S1, S2, S3, S6, and S7 are controlled by the power BMS main control module, and the contactors S9, S10, pre-charge contactor S11, main negative contactor S12, S13, and S14 are controlled by the auxiliary source BMS main control module. The contactor S4, pre-charge contactor S5, and contactor S8 are controlled by the vehicle control module. The power BMS main control module and the auxiliary source BMS main control module are respectively communicated with the vehicle control module.

[0007] Furthermore, the above-mentioned new energy vehicle multi-source system also includes a main high-voltage control box, an auxiliary source high-voltage control box and an all-in-one controller; the main high-voltage control box includes contactor S1, contactor S2, contactor S3, current detection module 1 and high-voltage detection module 1, and the current detection module 1 and the high-voltage detection module 1 are respectively communicated with the power BMS main control module; the auxiliary source high-voltage control box includes contactor S9, contactor S10, pre-charge contactor S11, main negative contactor S12, contactor S13, contactor S14, current detection module 2 and high-voltage detection module 2, and the current detection module 2 and the high-voltage detection module 2 are respectively communicated with the auxiliary source BMS main control module; the all-in-one controller includes contactor S4, pre-charge contactor S5, contactor S6, contactor S7 and contactor S8.

[0008] In a preferred embodiment, the power BMS main control module and the auxiliary source BMS main control module communicate with the vehicle control module on two different CAN communication circuits, CAN1 and CAN2.

[0009] The present invention also provides a control method for a multi-source system of a new energy vehicle, including power source selection and power supply switching of comfort electrical accessories.

[0010] The specific steps for selecting the power supply for comfort electrical accessories are as follows:

[0011] 1.1 The vehicle is in high-voltage power-on state.

[0012] 1.2 The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems.

[0013] 1.3 The power BMS main control module and the auxiliary source BMS main control module send their respective battery system status information to the vehicle control module.

[0014] 1.4 The vehicle control module obtains the status of two battery systems. It first determines whether the auxiliary power supply can meet the power demand of the comfort electrical accessories. If so, it locks the auxiliary power supply, disables the power battery from supplying power to the comfort electrical accessories, and sends the locking information to the power BMS main control module and the auxiliary source BMS main control module. If not, it determines whether the power battery can meet the power demand of the comfort electrical accessories. If so, it locks the power battery from supplying power to the comfort electrical accessories, disables the auxiliary power supply, and sends the locking information to the power BMS main control module and the auxiliary source BMS main control module. If not, it sends a corresponding alarm message to the vehicle instrument.

[0015] 1.5 If the auxiliary power supply is locked in step 1.4, the vehicle control module sends a high-voltage command to the auxiliary power source BMS main control module.

[0016] 1.6 After receiving the high-voltage command from the vehicle control module, the auxiliary source BMS main control module drives the pre-charge contactor S11 to close. After the pre-charge is completed, the main negative contactor S12 is closed and then the pre-charge contactor S11 is opened.

[0017] 1.7 If the auxiliary power supply is locked in step 1.4, the vehicle control module sends a closing instruction for contactors S9 and S10 of the comfort electrical accessories to the auxiliary source BMS main control module; if the power battery is locked in step 1.4, the vehicle control module sends a closing instruction for contactors S6 and S7 of the comfort electrical accessories to the power BMS main control module.

[0018] 1.8 After receiving the closing instructions for contactors S9 and S10 from the vehicle control module, the auxiliary source BMS main control module drives the closing of the corresponding contactors S9 and S10; after receiving the closing instructions for contactors S6 and S7 from the vehicle control module, the power BMS main control module drives the closing of the corresponding contactors S6 and S7.

[0019] When the auxiliary power supply cannot meet the power demand of the comfort electrical accessories, the power supply is switched to the power battery. The specific steps are as follows:

[0020] 2.1 The vehicle is in high voltage power-on state;

[0021] 2.2 The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems;

[0022] 2.3 The power BMS main control module and the auxiliary BMS main control module send their respective battery system status information to the vehicle control module;

[0023] 2.4 The vehicle control module determines whether the auxiliary power supply meets the power requirements of the comfort accessories. If so, the auxiliary power supply continues to supply power to the comfort accessories, and the vehicle control module continues to make this determination. If not, the vehicle control module continues to determine whether the power battery meets the power requirements of the comfort accessories.

[0024] 2.5 If the power battery does not meet the power demand in step 2.4, a corresponding warning message is sent to the vehicle instrument cluster; if the power battery meets the power demand in step 2.4, the power battery is locked to supply power to the comfort electrical accessories, and the lock information is sent to the power BMS main control module and the auxiliary power BMS main control module;

[0025] 2.6 The vehicle control module sends a disconnect instruction for contactors S9 and S10 to the auxiliary BMS main control module;

[0026] 2.7 After receiving the disconnection instruction of contactor S9 and contactor S10 from the vehicle control module, the auxiliary source BMS main control module drives the disconnection of the corresponding contactor S9 and contactor S10;

[0027] 2.8 The vehicle control module sends a disconnect command for the main negative contactor S12 to the auxiliary source BMS main control module;

[0028] 2.9 After receiving the main negative contactor S12 disconnection instruction from the vehicle control module, the auxiliary source BMS main control module drives the disconnection of the main negative contactor S12;

[0029] 2.10 The auxiliary source BMS main control module obtains the sampling information of the high-voltage sampling module and feeds back the status of the main negative contactor S12 to the vehicle control module;

[0030] 2.11 If the vehicle controller receives the disconnect status of the main negative contactor S12, it will send the closing instruction of contactors S6 and S7 to the power BMS main control module;

[0031] 2.12 After receiving the closing instruction of contactor S6 and contactor S7 from the vehicle control module, the power BMS main control module drives the corresponding contactors S6 and S7 to close.

[0032] The above-mentioned power battery and auxiliary power supply can be charged at the same time. There are three charging modes:

[0033] (1) The power battery is charged but the auxiliary power supply is not charged: the vehicle control module issues a command to close contactors S1, S2, and S3 of the power battery circuit. If the comfort electrical accessories need to work, the vehicle control module issues a command to close contactors S6 and S7, and prohibits contactors S9, S10, and the main negative contactor S12 from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery;

[0034] (2) The auxiliary power supply is charged but the power battery is not charged: the vehicle control module sends a command to close the main negative contactor S12, contactor S13, and contactor S14 of the auxiliary power supply circuit, and at the same time controls the awakening of the power battery BMS main control module but does not give the power battery A+ signal, completes the high-voltage power-on of the power battery, closes the contactor S1 and closes the auxiliary drive system contactor S8, the power battery supplies power to the low-voltage battery through DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. If the comfort electrical accessories need to work, the vehicle control module sends a command to close contactors S9 and S10, and contactors S6 and S7 are prohibited from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the auxiliary power supply high-voltage charging circuit;

[0035] (3) Charging the power battery and the auxiliary power supply at the same time: the vehicle control module issues a command to close contactors S1, S2, S3, main negative contactor S12, S13 and S14. If the comfort electric accessories need to work, the vehicle control module issues a command to close contactors S9 and S10 of the auxiliary power supply circuit, while contactors S6 and S7 of the power battery circuit are prohibited from closing. During the charging process, the power supply for the comfort electric accessories is provided by the DC charging circuit 2 of the auxiliary power supply. When the auxiliary power supply is charging and the power battery is out of charging, the power battery does not reduce the high voltage, and the power battery is turned on. The low-voltage battery is powered by DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. After the auxiliary power supply is charged, it exits. If the comfort electrical accessories need to work, the DC charging circuit 2 of the auxiliary power supply continues to provide power; when the power battery is charging and the auxiliary power supply exits charging, the vehicle control module sends an instruction to disconnect contactor S9, contactor S10, main negative contactor S12, contactor S13, and contactor S14. If the comfort electrical accessories need to work, the contactors S6 and S7 of the power battery circuit are closed, and the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery.

[0036] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0037] 1. The multi-source system for new energy vehicles of the present invention adds an auxiliary power supply on the basis of the original vehicle's high-voltage architecture. It communicates with the BMS main control modules of the two sets of batteries through the vehicle control module to obtain the status of the two sets of batteries. The auxiliary power supply is used to power the comfort electrical accessories first. When the auxiliary power supply is insufficient, it switches to power supply with the power battery. It is used to solve the problem of reduced vehicle range caused by power consumption of comfort electrical accessories such as air conditioning.

[0038] 2. The control method of the multi-source system of a new energy vehicle of the present invention is as follows: when the comfort electrical accessories need to work, the vehicle control module obtains the SOC, voltage, current, temperature, alarm information and other status of the two battery systems, and gives priority to using the auxiliary power supply to supply power to the comfort electrical accessories, without affecting the power supply of the main drive motor by the power battery. At the lowest cost, it ensures the normal opening of the comfort electrical accessories and the unchanged vehicle range. When the auxiliary power supply is insufficient or faulty, the vehicle control module can switch the power battery to supply power to the comfort electrical accessories by controlling the corresponding contactor, to prevent the comfort electrical accessories from being unable to start normally in this state, thereby causing serious consequences such as high temperature failure of the power battery.

[0039] 3. The present invention only needs to cover the cost of the newly added auxiliary power supply to ensure the normal operation of the comfort electrical accessories while ensuring that the vehicle's cruising range is not reduced, which greatly reduces costs. Because the two sets of batteries in the present invention operate independently, the two sets of batteries can be selected from any different brands and materials. The auxiliary power supply is not used for driving, but only powers components such as air conditioners and water cooling units. The operating conditions are relatively good, and the cycle life requirements are not high. Therefore, cost factors can be given priority when selecting solutions. Compared with the high cost of large-capacity power batteries in the original solution, this can play a role in reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is the electrical architecture diagram of the multi-source system for new energy vehicles of the present invention.

[0041] Figure 2 Flowchart for selecting power source for the comfort electrical accessories of the present invention.

[0042] Figure 3 This is a flow chart of power supply switching of the present invention. DETAILED DESCRIPTION

[0043] Refer to the following Figure 1 The following describes specific embodiments of the present invention. Numerous details are provided below to provide a comprehensive understanding of the present invention, but those skilled in the art will appreciate that the present invention can be implemented without these details. Well-known components, methods, and processes are not described in detail below.

[0044] Reference Figure 1This embodiment provides a new energy vehicle multi-source system, including a power battery, an auxiliary power supply, a vehicle control module, a main high-voltage control box, a power BMS main control module, an auxiliary source BMS main control module, an auxiliary source high-voltage control box, and an all-in-one controller. Among them, the power battery circuit is connected in parallel with a DC charging circuit 1, a main drive system branch, a comfort electric accessory branch 1, and an auxiliary drive system branch. The power battery circuit is connected in series with a current detection module 1 and a contactor S1, the DC charging circuit 1 is provided with contactors S2 and S3, the main drive system branch is connected in series with a contactor S4, and the two ends of the contactor S4 are also connected in parallel with a pre-charge resistor R1 and a pre-charge contactor S5; the comfort electric accessory branch 1 is connected in series with contactors S6 and S7 located on both sides of the comfort electric accessories, and the auxiliary drive system branch is provided with a contactor S8.

[0045] The auxiliary power supply circuit is connected in parallel with the comfort electrical accessory branch 2 and the DC charging circuit 2, wherein the comfort electrical accessory branch 2 is connected in series with contactor S9 and contactor S10 located on both sides of the comfort electrical accessory. The auxiliary power supply circuit is also connected in series with current detection module 2 and main negative contactor S12. Pre-charging contactor S11 and pre-charging resistor R2 are connected in parallel at both ends of the main negative contactor S12. Contactors S13 and contactor S14 are provided on the DC charging circuit 2.

[0046] The main high-voltage control box includes the above-mentioned contactor S1, contactor S2, contactor S3, current detection module 1 and high-voltage detection module 2; the all-in-one controller includes contactor S4, pre-charge contactor S5, contactor S6, contactor S7 and contactor S8; the auxiliary source high-voltage control box includes contactor S9, contactor S10, pre-charge contactor S11, main negative contactor S12, contactor S13, contactor S14, current detection module 2 and high-voltage detection module 2.

[0047] Contactors S1, S2, and S3 in the main high-voltage control box and contactors S6 and S7 in the all-in-one controller are controlled by the power BMS main control module. Contactors S9, S10, pre-charge contactor S11, main negative contactor S12, S13, and S14 in the auxiliary high-voltage control box are controlled by the auxiliary BMS main control module. Contactors S4, pre-charge contactor S5, and S8 in the all-in-one controller are controlled by the vehicle control module. The power BMS main control module and the auxiliary BMS main control module communicate with the vehicle control module on two different CAN communication circuits, CAN1 and CAN2.

[0048] The above-mentioned comfort electrical accessories include but are not limited to electric air conditioners, water cooling units, electric heaters, electric defrosts, PTC heaters, etc.; and the auxiliary drive system includes but is not limited to electric air pumps, electric steering pumps, low-voltage batteries, etc.

[0049] The above-mentioned multi-source system control method for new energy vehicles includes power supply selection and power supply switching for comfort electrical accessories.

[0050] 1. Power supply selection for comfort electrical accessories, refer to Figure 2 , the specific steps are as follows:

[0051] Step 1: The vehicle is in high voltage power-on state.

[0052] Step 2: The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems, including SOC, voltage, current, temperature, alarm information, etc.

[0053] Step 3: The power BMS main control module and the auxiliary source BMS main control module send their respective battery system status information to the vehicle control module.

[0054] Step 4: The vehicle control module obtains the status of the two battery systems. First, it determines whether the auxiliary power supply meets the power demand of the comfort electric accessories. If so, it locks the auxiliary power supply, disables the power battery from supplying power to the comfort electric accessories, and sends the locking information to the power BMS main control module and the auxiliary source BMS main control module. If not, it determines whether the power battery meets the power demand of the comfort electric accessories. If so, it locks the power battery from supplying power to the comfort electric accessories, disables the auxiliary power supply, and sends the locking information to the power BMS main control module and the auxiliary source BMS main control module. If not, it sends the corresponding alarm information to the vehicle instrument ( Figure 2 (taking the low SOC alarm as an example).

[0055] Step 5: If the auxiliary power supply is locked in step 4, the vehicle control module sends a high-voltage command to the auxiliary power source BMS main control module.

[0056] Step 6: After receiving the high-voltage instruction from the vehicle control module, the auxiliary source BMS main control module drives the closing of the pre-charge contactor S11. After the pre-charge is completed, the main negative contactor S12 is closed and then the pre-charge contactor S11 is opened.

[0057] Step 7: If the auxiliary power supply is locked in step 4, the vehicle control module sends a closing instruction for contactors S9 and S10 of the comfort electrical accessories to the auxiliary source BMS main control module; if the power battery is locked in step 4, the vehicle control module sends a closing instruction for contactors S6 and S7 of the comfort electrical accessories to the power BMS main control module.

[0058] Step 8: After receiving the closing instructions for contactors S9 and S10 from the vehicle control module, the auxiliary source BMS main control module drives the corresponding contactors S9 and S10 to close; after receiving the closing instructions for contactors S6 and S7 from the vehicle control module, the power BMS main control module drives the corresponding contactors S6 and S7 to close.

[0059] 2. When the auxiliary power supply is insufficient or there are other situations that cannot meet the power demand, refer to Figure 3 The specific steps for switching the power supply to the power battery are as follows:

[0060] Step 1: The vehicle is in high voltage power-on state.

[0061] Step 2: The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems, including SOC, voltage, current, temperature, alarm information, etc.

[0062] Step 3: The power BMS main control module and the auxiliary source BMS main control module send their respective battery system status information to the vehicle control module.

[0063] Step 4: The vehicle control module determines whether the auxiliary power supply meets the power demand of the comfort electrical accessories. If so, the auxiliary power supply continues to supply power to the comfort electrical accessories, and the vehicle control module continues to make judgments; if not, it continues to determine whether the power battery meets the power demand of the comfort electrical accessories.

[0064] Step 5: If the power battery in step 4 does not meet the power demand, a corresponding warning message is sent to the vehicle instrument ( Figure 3 Taking the SOC low alarm as an example); if the power battery meets the power demand in step 4, the power battery is locked to supply power to the comfort electrical accessories, and the locking information is sent to the power BMS main control module and the auxiliary source BMS main control module.

[0065] Step 6: The vehicle control module sends a disconnect instruction for contactors S9 and S10 to the auxiliary source BMS main control module.

[0066] Step 7: After receiving the disconnection instruction of contactor S9 and contactor S10 from the vehicle control module, the auxiliary source BMS main control module drives to disconnect the corresponding contactor S9 and contactor S10.

[0067] Step 8: The vehicle control module sends a disconnect command for the main negative contactor S12 to the auxiliary source BMS main control module.

[0068] Step 9: After receiving the main negative contactor S12 disconnection instruction issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect the main negative contactor S12.

[0069] Step 10: The auxiliary source BMS main control module obtains the sampling information of the high-voltage sampling module and feeds back the status of the main negative contactor S12 to the vehicle control module.

[0070] Step 11: If the vehicle controller receives the disconnect status of the main negative contactor S12, it sends a closing instruction for contactors S6 and S7 to the power BMS main control module.

[0071] Step 12: After receiving the closing instruction of contactor S6 and contactor S7 from the vehicle control module, the power BMS main control module drives the corresponding contactor S6 and contactor S7 to close.

[0072] The above power batteries and auxiliary power supplies can be charged at the same time. There are three charging modes:

[0073] (1) The power battery is charged but the auxiliary power supply is not charged: the vehicle control module sends a command to close contactors S1, S2 and S3 of the power battery circuit. If the comfort electrical accessories need to work, the vehicle control module sends a command to close contactors S6 and S7, and prohibits contactors S9, S10 and the main negative contactor S12 from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery.

[0074] (2) The auxiliary power supply is charged but the power battery is not charged: the vehicle control module sends a command to close the main negative contactor S12, contactor S13, and contactor S14 of the auxiliary power supply circuit, and at the same time controls the awakening of the power battery BMS main control module (but does not give the power battery A+ signal), completes the high-voltage power-on of the power battery, closes contactor S1 and closes the auxiliary drive system contactor S8, and the power battery supplies power to the low-voltage battery through DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. If the comfort electrical accessories need to work, the vehicle control module sends a command to close contactors S9 and S10, and contactors S6 and S7 are prohibited from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the auxiliary power supply high-voltage charging circuit.

[0075] (3) Charging the power battery and the auxiliary power supply at the same time: The vehicle control module issues a command to close contactors S1, S2, S3, main negative contactor S12, S13, and S14. If the comfort electrical accessories need to work, the vehicle control module issues a command to close contactors S9 and S10 of the auxiliary power supply circuit, while contactors S6 and S7 of the power battery circuit are prohibited from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the DC charging circuit 2 of the auxiliary power supply; when the auxiliary power supply is charging and the power battery is out of charging, the power battery does not reduce high voltage (except for faults that require high voltage reduction). The power battery supplies power to the low-voltage battery through DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. After the auxiliary power supply is charged, it exits. If the comfort electrical accessories need to work, the DC charging circuit 2 of the auxiliary power supply continues to provide power; when the power battery is charging and the auxiliary power supply exits charging, the vehicle control module sends an instruction to disconnect contactor S9, contactor S10, main negative contactor S12, contactor S13, and contactor S14. If the comfort electrical accessories need to work, the contactors S6 and S7 of the power battery circuit are closed, and the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery.

[0076] The above auxiliary power supply is only used to power comfort electrical accessories, but in actual applications it can also power the auxiliary drive system as needed.

[0077] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A new energy vehicle multi-source system, characterized by: It includes a power battery, an auxiliary power supply, a vehicle control module, a power BMS main control module, and an auxiliary source BMS main control module; the power battery circuit is connected in parallel with a DC charging circuit 1, a main drive system branch, a comfort electric accessory branch 1, and an auxiliary drive system branch; the power battery circuit is connected in series with a current detection module 1 and a contactor S1; the DC charging circuit 1 is provided with contactors S2 and S3; the main drive system branch is connected in series with a contactor S4; the two ends of the contactor S4 are also connected in parallel with a pre-charge resistor R1 and a pre-charge contactor S5; the comfort electric accessory branch is connected in series with a Contactors S6 and S7 are located on both sides of the comfort electrical accessories, and contactor S8 is provided on the auxiliary drive system branch; the auxiliary power supply circuit is connected in parallel with the comfort electrical accessory branch 2 and the DC charging circuit 2, and the comfort electrical accessory branch 2 is connected in series with contactors S9 and S10 located on both sides of the comfort electrical accessories. The auxiliary power supply circuit is also connected in series with current detection module 2 and main negative contactor S12, and pre-charge contactor S11 and pre-charge resistor R2 are connected in parallel at both ends of the main negative contactor S12. Contactors S13 and S14 are provided on the DC charging circuit 2; The contactors S1, S2, S3, S6 and S7 are controlled by the power BMS main control module; the contactors S9, S10, pre-charge contactor S11, main negative contactor S12, S13 and S14 are controlled by the auxiliary BMS main control module; the contactors S4, S5 and S8 are controlled by the vehicle control module; the power BMS main control module and the auxiliary BMS main control module are respectively connected to the vehicle control module; the vehicle control module obtains the two sets of battery system System status, first determine whether the auxiliary power supply meets the power demand of comfort electric accessories. If yes, lock the auxiliary power supply, disable the power battery to supply power to comfort electric accessories, and send the locking information to the power BMS main control module and the auxiliary source BMS main control module; if not, determine whether the power battery meets the power demand of comfort electric accessories. If yes, lock the power battery to supply power to comfort electric accessories, disable the auxiliary power supply, and send the locking information to the power BMS main control module and the auxiliary source BMS main control module; if not, send the corresponding alarm information to the vehicle instrument.

2. A new energy vehicle multi-source system according to claim 1, characterized in that: It also includes a main high-voltage control box, an auxiliary high-voltage control box and an all-in-one controller; the main high-voltage control box includes contactor S1, contactor S2, contactor S3, current detection module 1 and high-voltage detection module 1, and the current detection module 1 and the high-voltage detection module 1 are respectively communicated with the power BMS main control module; The auxiliary source high-voltage control box includes contactor S9, contactor S10, pre-charge contactor S11, main negative contactor S12, contactor S13, contactor S14, current detection module 2 and high-voltage detection module 2. The current detection module 2 and the high-voltage detection module 2 are respectively communicated with the auxiliary source BMS main control module; the all-in-one controller includes contactor S4, pre-charge contactor S5, contactor S6, contactor S7 and contactor S8.

3. A new energy vehicle multi-source system according to claim 1 or 2, characterized in that: The power BMS main control module and the auxiliary source BMS main control module communicate with the vehicle control module on two different CAN communication loops, CAN1 and CAN2.

4. A control method for a multi-source system of a new energy vehicle as claimed in claim 2, comprising power source selection for comfort electrical accessories, characterized in that: The specific steps are as follows: 1.1 The vehicle is in high voltage power-on state; 1.2 The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems; 1.3 The power BMS main control module and the auxiliary BMS main control module send their respective battery system status information to the vehicle control module; 1.4 The vehicle control module obtains the status of the two battery systems and first determines whether the auxiliary power supply can meet the power requirements of the comfort electrical accessories. If so, it locks the auxiliary power supply, disables the power battery from supplying power to the comfort electrical accessories, and sends the lock information to the power BMS main control module and the auxiliary BMS main control module. If not, it determines whether the power battery can meet the power requirements of the comfort electrical accessories. If so, it locks the power battery from supplying power to the comfort electrical accessories, disables the auxiliary power supply, and sends the lock information to the power BMS main control module and the auxiliary BMS main control module. If not, it sends a corresponding alarm message to the vehicle instrument cluster. 1.5 If the auxiliary power supply is locked in step 1.4, the vehicle control module sends a high-voltage command to the auxiliary power source BMS main control module; 1.6 After receiving the high-voltage command from the vehicle control module, the auxiliary source BMS main control module drives the closing of the pre-charge contactor S11. After the pre-charge is completed, the main negative contactor S12 is closed and the pre-charge contactor S11 is opened. 1.7 If the auxiliary power supply is locked in step 1.4, the vehicle control module sends a closing instruction to the auxiliary power source BMS main control module for comfort electrical accessories contactors S9 and S10; if the power battery is locked in step 1.4, the vehicle control module sends a closing instruction to the power BMS main control module for comfort electrical accessories contactors S6 and S7; 1.8 After receiving the closing instructions for contactors S9 and S10 from the vehicle control module, the auxiliary source BMS main control module drives the closing of the corresponding contactors S9 and S10; after receiving the closing instructions for contactors S6 and S7 from the vehicle control module, the power BMS main control module drives the closing of the corresponding contactors S6 and S7.

5. A new energy vehicle multi-source system control method as claimed in claim 4, characterized in that: It also includes switching the power supply to the power battery when the auxiliary power supply cannot meet the power demand of the comfort electrical accessories. The specific steps are as follows: 2.1 The vehicle is in high voltage power-on state; 2.2 The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems; 2.3 The power BMS main control module and the auxiliary BMS main control module send their respective battery system status information to the vehicle control module; 2.4 The vehicle control module determines whether the auxiliary power supply meets the power requirements of the comfort accessories. If so, the auxiliary power supply continues to supply power to the comfort accessories, and the vehicle control module continues to make this determination. If not, the vehicle control module continues to determine whether the power battery meets the power requirements of the comfort accessories. 2.5 If the power battery does not meet the power demand in step 2.4, a corresponding warning message is sent to the vehicle instrument cluster; if the power battery meets the power demand in step 2.4, the power battery is locked to supply power to the comfort electrical accessories, and the lock information is sent to the power BMS main control module and the auxiliary power BMS main control module; 2.6 The vehicle control module sends a disconnect instruction for contactors S9 and S10 to the auxiliary BMS main control module; 2.7 After receiving the disconnection instruction of contactor S9 and contactor S10 from the vehicle control module, the auxiliary source BMS main control module drives the disconnection of the corresponding contactor S9 and contactor S10; 2.8 The vehicle control module sends a disconnect command for the main negative contactor S12 to the auxiliary source BMS main control module; 2.9 After receiving the main negative contactor S12 disconnection instruction from the vehicle control module, the auxiliary source BMS main control module drives the disconnection of the main negative contactor S12; 2.10 The auxiliary source BMS main control module obtains the sampling information of the high-voltage sampling module and feeds back the status of the main negative contactor S12 to the vehicle control module; 2.11 If the vehicle controller receives the disconnect status of the main negative contactor S12, it will send the closing instruction of contactors S6 and S7 to the power BMS main control module; 2.12 After receiving the closing instruction of contactor S6 and contactor S7 from the vehicle control module, the power BMS main control module drives the corresponding contactors S6 and S7 to close.

6. A new energy vehicle multi-source system control method as claimed in claim 4, characterized in that: The power battery and auxiliary power supply can be charged simultaneously, and there are three charging modes: (1) The power battery is charged but the auxiliary power supply is not charged: the vehicle control module issues a command to close contactors S1, S2, and S3 of the power battery circuit. If the comfort electrical accessories need to work, the vehicle control module issues a command to close contactors S6 and S7, and prohibits contactors S9, S10, and the main negative contactor S12 from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery; (2) The auxiliary power supply is charged but the power battery is not charged: the vehicle control module sends a command to close the main negative contactor S12, contactor S13, and contactor S14 of the auxiliary power supply circuit, and at the same time controls the awakening of the power battery BMS main control module but does not give the power battery A+ signal, completes the high-voltage power-on of the power battery, closes the contactor S1 and closes the auxiliary drive system contactor S8, the power battery supplies power to the low-voltage battery through DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. If the comfort electrical accessories need to work, the vehicle control module sends a command to close contactors S9 and S10, and contactors S6 and S7 are prohibited from closing. During the charging process, the power supply for the comfort electrical accessories is provided by the auxiliary power supply high-voltage charging circuit; (3) Charging the power battery and the auxiliary power supply at the same time: the vehicle control module issues a command to close contactors S1, S2, S3, main negative contactor S12, S13 and S14. If the comfort electric accessories need to work, the vehicle control module issues a command to close contactors S9 and S10 of the auxiliary power supply circuit, while contactors S6 and S7 of the power battery circuit are prohibited from closing. During the charging process, the power supply for the comfort electric accessories is provided by the DC charging circuit 2 of the auxiliary power supply. When the auxiliary power supply is charging and the power battery is out of charging, the power battery does not reduce the high voltage, and the power battery is turned on. The low-voltage battery is powered by DC / DC, and then the low-voltage battery supplies low-voltage power to the auxiliary power supply. After the auxiliary power supply is charged, it exits. If the comfort electrical accessories need to work, the DC charging circuit 2 of the auxiliary power supply continues to provide power; when the power battery is charging and the auxiliary power supply exits charging, the vehicle control module sends an instruction to disconnect contactor S9, contactor S10, main negative contactor S12, contactor S13, and contactor S14. If the comfort electrical accessories need to work, the contactors S6 and S7 of the power battery circuit are closed, and the power supply for the comfort electrical accessories is provided by the DC charging circuit 1 of the power battery.

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