New energy automobile multi-source system and control method thereof

Abstract

The invention discloses a new energy automobile multi-source system and a control method thereof, and belongs to the technical field of new energy automobiles. According to the multi-source system of the new energy automobile, a set of auxiliary power supply is added on the basis of an original automobile high-voltage framework, and the whole automobile control module communicates with the BMS main control modules of the two sets of batteries to obtain the states of the two sets of batteries. When the comfortable electric accessory needs to work, the whole vehicle control module obtains the states of SOC, voltage, current, temperature, alarm information and the like of the two sets of battery systems, an auxiliary power supply is preferentially used for supplying power to the comfortable electric accessory, power supply of a power battery to a main drive motor is not affected, normal starting of the comfortable electric accessory is guaranteed with the lowest cost, and the comfortable electric accessory can work normally. The endurance mileage of the vehicle is not reduced; when the electric quantity of the auxiliary power supply is insufficient or a fault occurs, the whole vehicle control module can switch the power battery to supply power to the comfortable electric accessory by controlling the corresponding contactor, so that serious consequences such as a high-temperature fault of the power battery caused by the fact that the comfortable electric accessory cannot be normally started in the state are prevented.

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 new energy vehicles are driving in hot summer weather, the passenger compartment and power battery need to be cooled; when driving in cold winter weather, the passenger compartment and power battery need to be heated, and the windows need to be defrosted. The operation of the thermal management system will greatly increase power consumption and reduce the vehicle's range. A common scenario is that there will be long-term and long-distance traffic jams on highways during holidays. The power of the power battery of new energy vehicles is exhausted by the auxiliary systems, especially the air conditioner, and the vehicle breaks down halfway, causing users to be afraid to go on the highway during holidays and dare not take electric vehicles to travel long distances.

[0003] To solve the problem of insufficient driving range of new energy vehicles due to power consumption of auxiliary systems, the current main approach is to replace the vehicle with a set of power batteries with larger capacity. However, replacing a large-capacity power battery is costly and has limited selection. Multiple boxes of batteries must be of the same brand and type of battery cells. To this end, we provide a new energy vehicle multi-source system control method. 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 the existing new energy vehicles have reduced driving range due to power consumption of auxiliary systems.

[0005] The present invention adopts the following technical solution: A new energy vehicle multi-source system comprises 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; a DC charging circuit 1, a main drive system branch, a comfort electric accessory branch 1, and an auxiliary drive system branch are connected in parallel on the power battery circuit, a current detection module 1 and a contactor S1 are connected in series on the power battery circuit, a contactor S2 and a contactor S3 are provided on the DC charging circuit 1, a contactor S4 is connected in series on the main drive system branch, and a pre-charging resistor R1 and a pre-charging contactor S5 are also connected in parallel at both ends of the contactor S4, a contactor S6 and a contactor S7 located on both sides of the comfort electric accessories are connected in series on the comfort electric accessory branch 1, and a contactor S8 is provided on the auxiliary drive system branch; a comfort electric accessory branch 2 and a DC charging circuit 2 are connected in parallel on the auxiliary power supply circuit, and a contactor S9 is provided on the comfort electric accessory branch 2. Contactor S9 and contactor S10 on both sides of the comfort electrical accessories, 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-charging contactor S11 and a pre-charging resistor R2, and contactors S13 and S14 are provided on the DC charging circuit 2; the contactor S1, contactor S2, contactor S3, contactor S6, and contactor S7 are controlled by the power BMS main control module, the contactor S9, contactor S10, pre-charging contactor S11, main negative contactor S12, contactor S13, and contactor S14 are controlled by the auxiliary source BMS main control module, the contactor S4, pre-charging contactor S5, and contactor S8 are controlled by the vehicle control module, and the power BMS main control module and the auxiliary source BMS main control module are respectively communicated with the vehicle control module.

[0006] 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 one and high-voltage detection module one, and the current detection module one and the high-voltage detection module one 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 two and high-voltage detection module two, and the current detection module two and the high-voltage detection module two 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.

[0007] 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 loops, CAN1 and CAN2.

[0008] 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.

[0009] The specific steps for selecting the power supply for comfort electrical accessories are as follows: 1.1 The vehicle is in high voltage power-on state.

[0010] 1.2 The power BMS main control module and the auxiliary source BMS main control module monitor the status of their respective battery systems.

[0011] 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.

[0012] 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, the auxiliary power supply is locked, the power battery is disabled from supplying 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; if not, it determines whether the power battery can meet the power demand of the comfort electrical accessories. If so, the power battery is locked from supplying power to the comfort electrical accessories, the auxiliary power supply is disabled, and the locking information is sent to the power BMS main control module and the auxiliary source BMS main control module; if not, the corresponding alarm information is sent to the vehicle instrument.

[0013] 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 source BMS main control module.

[0014] 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-charging contactor S11. After the pre-charging is completed, the main negative contactor S12 is closed and then the pre-charging contactor S11 is disconnected.

[0015] 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.

[0016] 1.8 After receiving the closing instruction of contactor S9 and contactor S10 issued by 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 instruction of contactor S6 and contactor S7 issued by the vehicle control module, the power BMS main control module drives the closing of the corresponding contactors S6 and S7.

[0017] When the auxiliary power supply cannot meet the power demand of the comfort electric accessories, the power supply is switched to the power battery. 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 source 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 demand of the comfort electric accessories. If so, the auxiliary power supply continues to supply power to the comfort electric 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 electric accessories; 2.5 If the power battery does not meet the power demand in step 2.4, send a corresponding warning message to the vehicle instrument; if the power battery meets the power demand in step 2.4, lock the power battery to supply power to the comfort electrical accessories, and send the locking information to the power BMS main control module and the auxiliary source BMS main control module; 2.6 The vehicle control module sends a disconnect instruction of contactor S9 and contactor S10 to the auxiliary source BMS main control module; 2.7 After receiving the disconnection instruction of contactor S9 and contactor S10 issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect 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 issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect 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 disconnection status of the main negative contactor S12, it sends the closing instruction of contactor S6 and contactor 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 contactor S6 and contactor S7 to close.

[0018] The above power battery and auxiliary power supply can be charged at the same time. 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 contactors S9, S10 and main negative contactor S12 are prohibited 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 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; (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 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. The auxiliary power supply will exit after charging is completed. If the comfort electrical accessories need to work, the DC charging circuit 2 of the auxiliary power supply will continue to provide power; when the power battery is charging and the auxiliary power supply exits charging, the vehicle control module will issue a command to disconnect contactor S9, contactor S10, main negative contactor S12, contactor S13, and contactor S14. If the comfort electrical accessories need to work, contactors S6 and S7 of the power battery circuit will be closed, and the comfort electrical accessories will be powered by the DC charging circuit 1 of the power battery.

[0019] 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: 1. The multi-source system for new energy vehicles of the present invention adds a set of auxiliary power supply on the basis of the original vehicle high-voltage architecture, communicates with the BMS main control modules of the two sets of batteries respectively through the vehicle control module, obtains the status of the two sets of batteries, and gives priority to using the auxiliary power supply to power comfort electrical accessories. When the auxiliary power supply is insufficient, it switches to power supply with a power battery, so as to solve the problem of reduced vehicle range caused by power consumption of comfort electrical accessories such as air conditioners.

[0020] 2. The control method of the multi-source system of a new energy vehicle of the present invention is that when the comfort electrical accessories need to work, the vehicle control module obtains the SOC, voltage, current, temperature, alarm information and other states of the two battery systems, and gives priority to using the auxiliary power supply to supply power to the comfort electrical accessories, which does not affect the power supply of the main drive motor by the power battery, thereby ensuring the normal opening of the comfort electrical accessories and the unchanged vehicle range at the lowest cost; when the auxiliary power supply is insufficient or fails, the vehicle control module can control the corresponding contactor to switch the power battery to supply power to the comfort electrical accessories, thereby preventing 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.

[0021] 3. The present invention only needs to bear the cost of the newly added auxiliary power supply to ensure the normal opening of the comfort electrical accessories and to ensure that the vehicle's cruising range is not reduced, which greatly reduces the cost. Since the two sets of batteries in the present invention work independently, the two sets of batteries can be selected from any different brands and different material cells. The auxiliary power supply is not used for driving, but only supplies power to components such as air conditioners and water cooling units. The use conditions are relatively good, and the number of cycle life requirements is not high. The cost factor can be given priority when selecting the solution. Compared with the high cost of the large-capacity power battery in the original solution, it can play a role in reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the electrical architecture diagram of the new energy vehicle multi-source system of the present invention.

[0023] Figure 2 A flow chart for selecting a power source for the comfort electrical accessories of the present invention.

[0024] Figure 3 This is a flow chart of power supply switching of the present invention. DETAILED DESCRIPTION

[0025] Refer to the following Figure 1 The specific implementation of the present invention is described. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0026] Reference Figure 1, this 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, a DC charging circuit 1, a main drive system branch, a comfort electric accessory branch 1 and an auxiliary drive system branch are connected in parallel on the power battery circuit. A current detection module 1 and a contactor S1 are connected in series on the power battery circuit, contactors S2 and S3 are provided on the DC charging circuit 1, a contactor S4 is connected in series on the main drive system branch, and pre-charging resistor R1 and pre-charging contactor S5 are also connected in parallel at both ends of contactor S4; a comfort electric accessory branch 1 is connected in series with contactors S6 and S7 located on both sides of the comfort electric accessories, and a contactor S8 is provided on the auxiliary drive system branch.

[0027] The auxiliary power supply circuit is connected in parallel with a comfort electrical accessory branch two and a DC charging circuit two, wherein the comfort electrical accessory branch two is connected in series with contactors S9 and S10 located on both sides of the comfort electrical accessories, and the auxiliary power supply circuit is also connected in series with a current detection module two and a main negative contactor S12, and pre-charging contactor S11 and a pre-charging resistor R2 are connected in parallel at both ends of the main negative contactor S12, and contactors S13 and S14 are provided on the DC charging circuit two.

[0028] The main high-voltage control box includes the above-mentioned contactor S1, contactor S2, contactor S3, current detection module one and high-voltage detection module two; 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 two and high-voltage detection module two.

[0029] The contactors S1, S2, S3 in the main high-voltage control box and S6 and S7 in the all-in-one controller are controlled by the power BMS main control module, the contactors S9, S10, pre-charge contactor S11, main negative contactor S12, S13 and S14 in the auxiliary source high-voltage control box are controlled by the auxiliary source BMS main control module, and the 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 source BMS main control module communicate with the vehicle control module on two different CAN communication circuits, CAN1 and CAN2.

[0030] 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.

[0031] The above-mentioned multi-source system control method of new energy vehicles includes power source selection and power supply switching of comfort electrical accessories.

[0032] 1. Power supply selection for comfort electrical accessories, refer to Figure 2 , the specific steps are as follows: Step 1: The vehicle is in high voltage power-on state.

[0033] 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.

[0034] 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.

[0035] 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 Take the low SOC alarm as an example).

[0036] Step 5: If the auxiliary power supply is locked in step 4, the vehicle control module sends a high-voltage command to the auxiliary source BMS main control module.

[0037] Step 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-charging contactor S11. After the pre-charging is completed, the main negative contactor S12 is closed and then the pre-charging contactor S11 is opened.

[0038] 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.

[0039] Step 8: After receiving the closing instruction of contactor S9 and contactor S10 issued by 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 instruction of contactor S6 and contactor S7 issued by the vehicle control module, the power BMS main control module drives the closing of the corresponding contactors S6 and S7.

[0040] 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: Step 1: The vehicle is in high voltage power-on state.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 panel ( 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.

[0045] Step 6: The vehicle control module sends a disconnect instruction of contactor S9 and contactor S10 to the auxiliary source BMS main control module.

[0046] Step 7: After receiving the disconnection instruction of contactor S9 and contactor S10 issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect the corresponding contactor S9 and contactor S10.

[0047] Step 8: The vehicle control module sends a disconnect command of the main negative contactor S12 to the auxiliary source BMS main control module.

[0048] 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.

[0049] 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.

[0050] Step 11: If the vehicle controller receives the disconnection status of the main negative contactor S12, it sends a closing instruction of contactor S6 and contactor S7 to the power BMS main control module.

[0051] 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.

[0052] The above power batteries and auxiliary power supplies can be charged at the same time. 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. Contactors S9, S10 and main negative contactor S12 are prohibited 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.

[0053] (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.

[0054] (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 lower the high voltage (except for faults that require lowering the high voltage). 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 a command 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.

[0055] 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.

[0056] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. 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 in that: 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; both ends of the contactor S4 are also connected in parallel with a pre-charging resistor R1 and a pre-charging contactor S5; the comfort electric accessory branch is connected in series with a Contactor S6 and contactor 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, and the auxiliary power supply circuit is also connected in series with current detection module 2 and main negative contactor S12, and both ends of the main negative contactor S12 are connected in parallel with pre-charging contactor S11 and pre-charging resistor R2, and contactors S13 and contactor 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 source BMS main control module; the contactors S4, pre-charge contactor S5 and 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.

2. A new energy vehicle multi-source system as claimed in 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 a contactor S1, a contactor S2, a contactor S3, a current detection module 1 and a high-voltage detection module 1, and the current detection module 1 and the high-voltage detection module 1 are respectively connected to the power BMS main control module for communication; 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 as claimed in 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 new energy vehicle multi-source system 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 source 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 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; 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-charging contactor S11. After the pre-charging is completed, the main negative contactor S12 is closed and then the pre-charging contactor S11 is disconnected; 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 electric 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 electric accessories to the power BMS main control module; 1.8 After receiving the closing instruction of contactor S9 and contactor S10 issued by 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 instruction of contactor S6 and contactor S7 issued by 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 electric 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 source 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 demand of the comfort electric accessories. If so, the auxiliary power supply continues to supply power to the comfort electric 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 electric accessories; 2.5 If the power battery does not meet the power demand in step 2.4, send a corresponding warning message to the vehicle instrument; if the power battery meets the power demand in step 2.4, lock the power battery to supply power to the comfort electrical accessories, and send the locking information to the power BMS main control module and the auxiliary source BMS main control module; 2.6 The vehicle control module sends a disconnect instruction of contactor S9 and contactor S10 to the auxiliary source BMS main control module; 2.7 After receiving the disconnection instruction of contactor S9 and contactor S10 issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect 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 issued by the vehicle control module, the auxiliary source BMS main control module drives to disconnect 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 disconnection status of the main negative contactor S12, it sends the closing instruction of contactor S6 and contactor 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 contactor S6 and contactor 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 at the same time, 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 contactors S9, S10 and main negative contactor S12 are prohibited 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 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; (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 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. The auxiliary power supply will exit after charging is completed. If the comfort electrical accessories need to work, the DC charging circuit 2 of the auxiliary power supply will continue to provide power; when the power battery is charging and the auxiliary power supply exits charging, the vehicle control module will issue a command to disconnect contactor S9, contactor S10, main negative contactor S12, contactor S13, and contactor S14. If the comfort electrical accessories need to work, contactors S6 and S7 of the power battery circuit will be closed, and the comfort electrical accessories will be powered by the DC charging circuit 1 of the power battery.

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