High-voltage system suitable for double main drives of electric heavy truck

Abstract

The utility model provides a high voltage system suitable for electric heavy truck double main drive relates to new energy electric automobile technical field, including power battery, high voltage box, first main drive unit and second main drive unit, power battery connects the high voltage box, high voltage box connects first main drive unit and second main drive unit respectively. Power distribution control of the first main drive unit and the second main drive unit is moved to the high-voltage box, and the high-voltage box is not limited by spatial arrangement, so that the overall spatial arrangement of the high-voltage system is more reasonable and optimized, the development requirement of a double-main-drive power distribution whole vehicle can be met, and the performance of the whole vehicle is improved; the influence of space arrangement limitation on the all-in-one controller is effectively avoided, and stable operation of the whole vehicle is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy electric vehicles, and in particular to a high-voltage system suitable for dual-main drives of electric heavy trucks. Background Art

[0002] With the increasing global awareness of environmental protection and the continuous optimization of energy structure, electric heavy-duty trucks, as an important part of the new energy vehicle field, are gradually replacing traditional fuel heavy-duty trucks and becoming the new favorite in the logistics and transportation industry. Electric heavy-duty trucks have been widely used for their advantages such as zero emissions, low noise and high efficiency.

[0003] At present, new energy electric heavy-duty trucks are gradually adopting electric drive axle drive. Electric drive axle drive integrates components such as electric motors, reducers, differentials, etc. on the drive axle, and directly drives the wheels to rotate through the electric motor. However, when driving in harsh working conditions such as mountain roads, the vehicle has more stringent requirements on power performance. In order to meet these needs, the high-power version of the dual-motor system has become the development trend of electric heavy-duty trucks. The dual-motor system can provide greater torque output, allowing the vehicle to easily cope with steep slopes or heavy-load transportation, ensuring the smooth completion of the transportation task.

[0004] The existing dual-main drive high-voltage system uses an all-in-one controller to adjust the working state of the electric drive axle, which can adapt to harsh working conditions such as long-term climbing in mountainous areas. However, since the original intention of the existing high-voltage system to use an all-in-one controller is to integrate multiple functions into one controller, this design will bring about the problem of spatial compactness, making the all-in-one controller limited by space layout. In a dual-main drive power distribution vehicle, a larger space is required to accommodate key components such as high-power motor controllers and battery management systems. The all-in-one controller may not be able to provide enough space to place these key components due to space layout restrictions, resulting in the inability to meet the development needs of high-power dual-main drive power distribution vehicles, affecting the performance improvement of the vehicle. Utility Model Content

[0005] In order to solve the problem that the all-in-one controller in the prior art is limited by space layout, thus affecting the performance of the whole vehicle, the utility model proposes a high-voltage system suitable for the dual-main drive of electric heavy-duty trucks, which effectively avoids the influence of the all-in-one controller on space layout limitation and ensures the stable operation of the whole vehicle performance.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0007] A high-voltage system suitable for dual main drives of electric heavy trucks comprises: a power battery, a high-voltage box, a first main drive unit and a second main drive unit, wherein the power battery is connected to the high-voltage box, and the high-voltage box is respectively connected to the first main drive unit and the second main drive unit.

[0008] Here, the power battery, as the energy center of the high-voltage system, can stabilize the high-voltage power supply for the first main drive unit and the second main drive unit. The high-voltage box plays the role of central power distribution. The power energy of the power battery is directly input into the high-voltage box. The high-voltage box is responsible for distributing the power output of the power battery to the first main drive unit and the second main drive unit. The first main drive unit and the second main drive unit receive the power output from the high-voltage box, and then drive the main drive to complete the conversion of electrical energy into mechanical energy; the power distribution control of the first main drive unit and the second main drive unit is moved to the high-voltage box. The high-voltage box is not restricted by the spatial layout, which makes the overall spatial layout of the high-voltage system more reasonable and optimized, and can meet the development needs of dual-main drive power distribution vehicles and improve the performance of the vehicle.

[0009] Preferably, the high voltage box is provided with a first power distribution unit and a second power distribution unit connected in parallel, the first power distribution unit is connected to the first main drive unit, and the second power distribution unit is connected to the second main drive unit. By connecting the first power distribution unit and the second power distribution unit in parallel in the high voltage box, a redundant design of power distribution for the first main drive unit and the second main drive unit is realized, that is, the purpose of supporting dual main drive system redundancy is achieved.

[0010] Preferably, the high voltage box is further provided with a fifth contactor K10, at least one main positive contactor, and at least one main negative contactor;

[0011] The positive terminal of the power battery is respectively connected to one end of the main positive contactor, and the other end of the main positive contactor is respectively connected to one end of the first distribution unit and the second distribution unit through the maintenance switch unit. The other end of the first distribution unit is connected to the input end of the first main drive unit, and the other end of the second distribution unit is connected to the input end of the second main drive unit. The output end of the first main drive unit and the output end of the second main drive unit are connected to the main negative contactor, and the main negative contactor is connected to one end of the fifth contactor K10, and the other end of the fifth contactor K10 is connected to the negative terminal of the power battery.

[0012] Here, the switching states of the main positive contactor, the fifth contactor K10 and the main negative contactor are used to implement the power distribution strategy inside the high-voltage box, providing protection for the high-voltage box to control the first main drive unit and the second main drive unit; the maintenance switch unit can be used to conveniently disconnect the high-voltage circuit, which is an important safety protection unit in the high-voltage box.

[0013] Preferably, the high voltage box is further provided with at least one heating contactor, a heating control switch K5, at least one positive charging contactor, a fourteenth contactor K19 and at least one negative charging contactor;

[0014] The main positive contactor is respectively connected to one end of the heating contactor, the other end of the heating contactor is connected to the positive end of the heating element, the negative end of the heating element is connected to one end of the heating control switch K5, and the other end of the heating control switch K5 is connected to the fifth contactor K10; one end of the charging positive contactor is connected to the positive end of the charger, the other end of the charging positive contactor is connected to the main positive contactor, one end of the fourteenth contactor K19 is connected to the positive end of the water cooling unit, and the negative end of the water cooling unit is connected to the fifth contactor K10; one end of the charging negative contactor is connected to the negative end of the charger, and the other end of the charging negative contactor is commonly connected to the fifth contactor K10.

[0015] Here, the switching states of the heating contactor and the heating control switch K5 are used to control the heating element of the high-voltage box; the switching states of the positive contact of the charger and the negative contact of the charger are used to connect the charger to the high-voltage box, so that the charger converts external electrical energy into a device suitable for charging the power battery, providing stable charging for the power battery; the switching states of the fourteenth contactor K19 and the fifth contactor K10 are used to control the water cooling unit of the high-voltage box, so as to facilitate driving the water cooling unit to provide efficient cooling and heat dissipation, and ensure that the high-voltage system can operate stably even in a high-temperature environment;

[0016] Preferably, the first power distribution unit includes a first buffer resistor R1, a first pre-filling contactor K11 and a first main contactor K12, the maintenance switch unit is connected to one end of the first buffer resistor R1 and the first main contactor K12 respectively, the other end of the first buffer resistor R1 is connected to one end of the first pre-filling contactor K11, and the other end of the first pre-filling contactor K11 and the other end of the first main contactor K12 are connected to the first main drive unit. Through the cooperation of the first buffer resistor R1, the first pre-filling contactor K11 and the first main contactor K12, sufficient protection is provided for the high-voltage box to supply power to the first power distribution unit.

[0017] Preferably, the second power distribution unit includes a second buffer resistor R2, a second pre-filling contactor K13 and a second main contactor K14, the maintenance switch unit is respectively connected to one end of the second buffer resistor R2 and the second main contactor K14, the other end of the second buffer resistor R2 is connected to one end of the second pre-filling contactor K13, and the other end of the second pre-filling contactor K13 and the other end of the second main contactor K14 are jointly connected to the second main drive unit. Through the cooperation of the second buffer resistor R2, the second pre-filling contactor K13 and the second main contactor K14, sufficient protection is provided for the high-voltage box to supply power to the first power distribution unit.

[0018] Preferably, the first main drive unit includes a first motor M1 and a first single-chip microcomputer MCU1 for controlling the driving of the first motor M1, the first power distribution unit is connected to the positive terminal of the first single-chip microcomputer MCU1 through the input terminal of the first main drive unit, and the negative terminal of the first single-chip microcomputer MCU1 is connected to the sixth contactor K15 through the output terminal of the first main drive unit. By using the first power distribution unit to supply power to the first single-chip microcomputer MCU1, it is convenient to control the first single-chip microcomputer MCU1 to drive the first motor M1.

[0019] Preferably, the second main drive unit includes a second motor M2 and a second single-chip microcomputer MCU2 for controlling the driving of the second motor M2, the second power distribution unit is connected to the positive terminal of the second single-chip microcomputer MCU2 through the input terminal of the second main drive unit, and the negative terminal of the second single-chip microcomputer MCU2 is connected to the sixth contactor K15 through the output terminal of the second main drive unit. By using the second power distribution unit to supply power to the second single-chip microcomputer MCU2, it is convenient to control the second single-chip microcomputer MCU2 to drive the first motor M2.

[0020] Preferably, it also includes an integrated controller for controlling several auxiliary electrical components, the positive terminal of the integrated controller is connected to the maintenance switch unit in the high-voltage box, the negative terminal of the integrated controller is connected to the seventh contactor K16 in the high-voltage box, and the integrated controller is provided with several distribution branches, one end of each distribution branch is connected to the maintenance switch unit in the high-voltage box, the other end of each distribution branch is connected to the positive terminal of an auxiliary electrical component, and the negative terminal of each auxiliary electrical component is connected to the seventh contactor K16 in the high-voltage box. The high-voltage box is used to supply high voltage to the integrated controller so that the integrated controller is powered on and works. The integrated controller drives the auxiliary electrical components by controlling the on and off states of the internally set distribution branches. When the integrated controller fails, the maintenance switch unit is used to disconnect the power supply provided to the integrated controller by the high-voltage box to achieve maintenance of the integrated controller.

[0021] Preferably, it also includes a domain controller, which is respectively connected to the first main drive unit, the second main drive unit, the integrated controller and the battery management unit BMS arranged in the high-voltage box through a CAN bus.

[0022] Here, the domain controller XCU realizes centralized management and control of the entire high-voltage system by connecting the first main drive unit, the second main drive unit, the integrated controller and the battery management unit BMS arranged in the high-voltage box. The domain controller XCU enables the high-voltage system to distribute electric energy more efficiently, thereby improving the intelligence level of the system; the battery management unit BMS is arranged in the battery distribution box, and can monitor the status of the power battery in real time to ensure that the power battery works under safe and efficient conditions. The battery management unit BMS works in coordination with the domain controller XCU to realize a more accurate battery management strategy.

[0023] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0024] The utility model proposes a high-voltage system suitable for electric heavy-duty trucks with dual main drives. First, a power battery is connected to a high-voltage box, and the high-voltage box is respectively connected to a first main drive unit and a second main drive unit. The purpose is to move the power distribution of the dual main drive units to the high-voltage box for control, so as to solve the problem that the power distribution of the dual main drive units is controlled by a multi-in-one controller with tight internal space arrangement, which leads to the inability to meet the development requirements of high-power dual main drive power distribution vehicles and affects the performance improvement of the whole vehicle. As the energy center of the high-voltage system, the power battery can stabilize the high-voltage power supply for the first main drive unit and the second main drive unit. The high-voltage box plays a central power distribution role. The power energy of the power battery is directly input into the high-voltage box, and the high-voltage box is responsible for distributing the power output of the power battery to the first main drive unit and the second main drive unit. The first main drive unit and the second main drive unit receive the power output from the high-voltage box, and then drive the main drive to complete the conversion of power energy into mechanical energy. The power distribution control of the first main drive unit and the second main drive unit is moved to the high-voltage box, and the high-voltage box is not restricted by the space arrangement, so that the overall space layout of the high-voltage system is more reasonable and optimized, which can meet the development requirements of the dual main drive power distribution vehicle and improve the performance of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A first block diagram showing a high voltage system suitable for dual main drive of an electric heavy truck proposed in an embodiment of the utility model;

[0026] Figure 2 A second block diagram showing a high voltage system suitable for dual main drive of an electric heavy truck proposed in an embodiment of the utility model;

[0027] Figure 3 A third block diagram showing a high voltage system suitable for dual main drive of an electric heavy truck proposed in an embodiment of the utility model.

[0028] 1. Power battery; 2. High-voltage box; 21. First power distribution unit; 22. Second power distribution unit; 23. Maintenance switch unit; 3. First main drive unit; 4. Second main drive unit; 5. Integrated controller; 6. Domain controller. DETAILED DESCRIPTION

[0029] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0030] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent actual sizes. The description of the directions of parts such as "upper" and "lower" does not limit the present patent;

[0031] It is understandable to those skilled in the art that some well-known contents may be omitted in the drawings;

[0032] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0033] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment proposes a high-voltage system suitable for dual main drives of electric heavy trucks, including: a power battery 1, a high-voltage box 2, a first main drive unit 3 and a second main drive unit 4, the power battery 1 is connected to the high-voltage box 2, and the high-voltage box 2 is respectively connected to the first main drive unit 3 and the second main drive unit 4.

[0036] In this embodiment, the power battery 1 serves as the energy center of the high-voltage system and can stabilize the high-voltage power supply for the first main drive unit 3 and the second main drive unit 4. The high-voltage box 2 plays the role of central power distribution. The electric energy of the power battery 1 is directly input into the high-voltage box 2. The high-voltage box 2 is responsible for distributing the electric energy output by the power battery to the first main drive unit 3 and the second main drive unit 4. The first main drive unit 3 and the second main drive unit 4 receive the electric energy output from the high-voltage box 2, and then drive the main drive to complete the conversion of electric energy into mechanical energy. The power distribution control of the first main drive unit 3 and the second main drive unit 4 is moved to the high-voltage box 2. The high-voltage box 2 is not restricted by the spatial layout, which makes the overall spatial layout of the high-voltage system more reasonable and optimized, and can meet the development needs of dual-main drive power distribution vehicles and improve the performance of the vehicle.

[0037] Example 2

[0038] See also Figure 2 The high voltage box 2 is provided with a first power distribution unit 21 and a second power distribution unit 22 connected in parallel, wherein the first power distribution unit 21 is connected to the first main drive unit 3 , and the second power distribution unit 22 is connected to the second main drive unit 4 .

[0039] Since the existing dual-main drive high-voltage system generally uses an all-in-one controller to drive the dual main drives, when one of the main drives fails, the system cannot respond effectively, resulting in the vehicle being unable to continue driving. In order to avoid the above problem, the first power distribution unit and the second power distribution unit are connected in parallel in the high-voltage box to achieve redundant power distribution for the first main drive unit and the second main drive unit, that is, the redundancy of the dual main drive power distribution is taken into account, achieving the purpose of supporting the redundancy of the dual main drive system and ensuring the stable operation of the vehicle performance.

[0040] The high voltage box 2 is also provided with a fifth contactor K10, four main positive contactors, and two main negative contactors; wherein the four main positive contactors include a first contactor K6, a second contactor K7, a third contactor K8 and a fourth contactor K9, and the two main negative contactors are a sixth contactor K15 and a seventh contactor K16;

[0041] The positive terminal of the power battery 1 is respectively connected to one end of the first contactor K6, the second contactor K7, the third contactor K8 and the fourth contactor K9, and the other ends of the first contactor K6, the second contactor K7, the third contactor K8 and the fourth contactor K9 are respectively connected to one end of the first distribution unit 21 and the second distribution unit 22 through the maintenance switch unit 23. The other end of the first distribution unit 21 is connected to the input end of the first main drive unit 3, and the other end of the second distribution unit 22 is connected to the input end of the second main drive unit 4. The output end of the first main drive unit 3 and the output end of the second main drive unit 4 are connected to the sixth contactor K15. The sixth contactor K15 and the seventh contactor K16 are connected in parallel and connected to one end of the fifth contactor K10. The other end of the fifth contactor K10 is connected to the negative terminal of the power battery 1. The switch states of the first contactor K6, the second contactor K7, the third contactor K8, the fourth contactor K9, the fifth contactor K10, the sixth contactor K15 and the seventh contactor K16 are used to implement the power distribution strategy inside the high-voltage box, and provide protection for the high-voltage box to control the first main drive unit and the second main drive unit; the maintenance switch unit can conveniently disconnect the high-voltage circuit and is an important safety protection unit. The maintenance switch unit 23 is composed of two parallel manual maintenance switches MSD. When the vehicle is overhauled, the manual maintenance switch MSD is opened to disconnect the high-voltage system power supply;

[0042] The first power distribution unit 21 includes a first buffer resistor R1, a first pre-filling contactor K11 and a first main contactor K12, the maintenance switch unit 23 is respectively connected to one end of the first buffer resistor R1 and the first main contactor K12, the other end of the first buffer resistor R1 is connected to one end of the first pre-filling contactor K11, and the other end of the first pre-filling contactor K11 and the other end of the first main contactor K12 are commonly connected to the first main drive unit 3. Through the cooperation of the first buffer resistor R1, the first pre-filling contactor K11 and the first main contactor K12, sufficient protection is provided for the high-voltage box to supply power to the first power distribution unit.

[0043] The second power distribution unit 22 includes a second buffer resistor R2, a second pre-filling contactor K13 and a second main contactor K14, the maintenance switch unit 23 is respectively connected to one end of the second buffer resistor R2 and the second main contactor K14, the other end of the second buffer resistor R2 is connected to one end of the second pre-filling contactor K13, and the other end of the second pre-filling contactor K13 and the other end of the second main contactor K14 are commonly connected to the second main drive unit 4. Through the cooperation of the second buffer resistor R2, the second pre-filling contactor K13 and the second main contactor K14, sufficient protection is provided for the high-voltage box to supply power to the first power distribution unit.

[0044] The first main drive unit 3 includes a first motor M1 and a first single-chip microcomputer MCU1 for controlling the driving of the first motor M1. The first power distribution unit 21 is connected to the positive terminal of the first single-chip microcomputer MCU1 through the input terminal of the first main drive unit 3, and the negative terminal of the first single-chip microcomputer MCU1 is connected to the sixth contactor K15 through the output terminal of the first main drive unit 3. By using the first power distribution unit to supply power to the first single-chip microcomputer MCU1, it is convenient to control the first single-chip microcomputer MCU1 to drive the first motor M1.

[0045] The second main drive unit 4 includes a second motor M2 and a second single-chip microcomputer MCU2 for controlling the driving of the second motor M2. The second power distribution unit 22 is connected to the positive terminal of the second single-chip microcomputer MCU2 through the input terminal of the second main drive unit 4, and the negative terminal of the second single-chip microcomputer MCU2 is connected to the sixth contactor K15 through the output terminal of the second main drive unit 4. By using the second power distribution unit to supply power to the second single-chip microcomputer MCU2, it is convenient to control the second single-chip microcomputer MCU2 to drive the first motor M2. Figure 2 , the working principle of the high-voltage system is as follows:

[0046] The first contactor K6, the second contactor K7, the third contactor K8 and the fourth contactor K9 are closed to connect the positive circuit of the power battery 1, and the fifth contactor K10, the sixth contactor K15 and the seventh contactor K16 are closed to connect the negative circuit of the power battery 1. At this time, the battery system composed of the power battery 1 and the high-voltage box 2 is powered on at high voltage;

[0047] The first pre-charge contactor K11 is closed, and the high-voltage box 2 pre-charges the first single-chip microcomputer MCU1. When the pre-charge voltage reaches 98% of the system voltage threshold, the first main contactor K12 is closed, and after a delay of 200ms, the first pre-charge contactor K11 is disconnected. At this time, the first single-chip microcomputer MCU1 completes high-voltage power-up; the first buffer resistor R1 is used to prevent excessive current flowing through the first single-chip microcomputer MCU1, which may damage the first single-chip microcomputer MCU1;

[0048] The second pre-charge contactor K13 is closed, and the high-voltage box 2 pre-charges the second single-chip microcomputer MCU2. When the pre-charge voltage reaches 98% of the system voltage threshold, the second main contactor K14 is closed, and after a delay of 200ms, the second pre-charge contactor K13 is disconnected. At this time, the second single-chip microcomputer MCU2 completes the high-voltage power-on; the second buffer resistor R2 is used to prevent excessive current flowing through the second single-chip microcomputer MCU2, which may damage the second single-chip microcomputer MCU2;

[0049] It should be noted that the high-voltage box has a redundant power distribution design for dual main drives. The two main drive MCU1 and MCU2 are independently pre-charged and switched on and off. If one of the main drive MCU1 fails, the first main contactor K12 of the circuit is disconnected to avoid affecting the other circuit. If the other main drive MCU2 fails, the domain controller 6 diagnoses the main drive MCU2 failure and disconnects the K14 contactor of the circuit;

[0050] In this embodiment, first, the power battery is connected to the high-voltage box, and the first power distribution unit and the second power distribution unit connected in parallel are provided in the high-voltage box. The first power distribution unit is connected to the first main drive unit, and the second power distribution unit is connected to the second main drive unit. The purpose is to move the power distribution of the dual main drive units from the all-in-one controller to the high-voltage box, so as to solve the problems of tight internal space layout of the all-in-one controller and limited layout of the main drive power distribution contactor and copper busbar, and play a role in supporting the use of high-power dual main drive systems; then, through the first power distribution unit and the second power distribution unit connected in parallel in the high-voltage box, the redundant design of power distribution of the first main drive unit and the second main drive unit is realized, that is, the purpose of supporting the redundancy of the dual main drive system is achieved.

[0051] Example 3

[0052] See also Figure 3 , the high voltage box 2 is also provided with 4 heating contactors, a heating control switch K5, 2 charging positive contactors, a 14th contactor K19 and 2 charging negative contactors; wherein the 4 heating contactors are the 8th contactor K1, the 9th contactor K2, the 10th contactor K3 and the 11th contactor K4, the 2 charging positive contactors are the 12th contactor K17 and the 13th contactor K18, and the 2 charging negative contactors are the 15th contactor K20 and the 16th contactor K21;

[0053] The main positive contactor (any one of K6-K9) is respectively connected to one end of the eighth contactor K1, the ninth contactor K2, the tenth contactor K3 and the eleventh contactor K4, and the other ends of the eighth contactor K1, the ninth contactor K2, the tenth contactor K3 and the eleventh contactor K4 are connected to the heating element, wherein four heating elements are provided, namely the first heating element, the second heating element, the third heating element and the fourth heating element, the other end of the eighth contactor K1 is connected to the positive end of the first heating element, the negative end of the first heating element is connected to one end of the heating control switch K5, the other end of the heating control switch K5 is connected to the fifth contactor K10, the other end of the ninth contactor K2 is connected to the positive end of the second heating element, the negative end of the second heating element is connected to one end of the heating control switch K5, the other end of the tenth contactor K3 is connected to the positive end of the third heating element, the negative end of the third heating element is connected to one end of the heating control switch K5, the eleventh contactor K4 is connected to the positive end of the third heating element, the negative end of the third heating element is connected to one end of the heating control switch K5, The other end of the contactor K4 is connected to the positive end of the fourth heating element, the negative end of the fourth heating element is connected to one end of the heating control switch K5, and the other end of the heating control switch K5 is connected to the fifth contactor K10; one end of the twelfth contactor K17 and the thirteenth contactor K18 is connected to the positive end of the charger, the other end of the twelfth contactor K17 is respectively connected to the first contactor K6, the second contactor K7, the third contactor K8 and the fourth contactor K9, and the other end of the thirteenth contactor K18 is respectively connected to the first contactor K6, the second contactor K7, the third contactor K8 and the fourth contactor K9; one end of the fourteenth contactor K19 is connected to the positive end of the water cooling unit, and the negative end of the water cooling unit is connected to the fifth contactor K10; one end of the fifteenth contactor K20 and the sixteenth contactor K21 is connected to the negative end of the charger, and the other end of the fifteenth contactor K20 and the other end of the sixteenth contactor K21 are commonly connected to the fifth contactor K10.

[0054] Example 4

[0055] See also Figure 3 A high-voltage system suitable for dual-main drive of electric heavy trucks also includes an integrated controller 5 for controlling five auxiliary electrical components, the positive terminal of the integrated controller 5 is connected to the maintenance switch unit 23 in the high-voltage box 2, and the negative terminal of the integrated controller 5 is connected to the seventh contactor K16 in the high-voltage box 2.

[0056] The integrated controller 5 is provided with a plurality of distribution branches, one end of each distribution branch is connected to the maintenance switch unit 23 in the high-voltage box 2, the other end of each distribution branch is connected to the positive terminal of an auxiliary electrical component, and the negative terminal of each auxiliary electrical component is connected to the seventh contactor K16 in the high-voltage box 2. Among them, the five auxiliary electrical components include auxiliary drive components and electrical auxiliary components, the auxiliary drive components include air compressors, oil pump motors and batteries, the electrical auxiliary components include air conditioners and heating devices PTC, and the five distribution branches include air compressor distribution branch, oil pump motor distribution branch, battery distribution branch, air conditioner distribution branch and heating device PTC distribution branch;

[0057] The air compressor power distribution branch includes an air compressor power distribution switch K26 and an air pump controller APC for controlling the air compressor drive. One end of the air compressor power distribution switch K26 is connected to the maintenance switch unit 23 in the high-voltage box 2, and the other end of the air compressor power distribution switch K26 is connected to the positive terminal of the air pump controller APC. The negative terminal of the air pump controller APC is connected to the seventh contactor K16 in the high-voltage box 2.

[0058] The oil pump motor power distribution branch includes an oil pump motor power distribution switch K25, an oil pump buffer resistor and an oil pump controller OPC. One end of the oil pump motor power distribution switch K25 is connected to the maintenance switch unit 23 in the high-voltage box 2, and the other end of the oil pump motor power distribution switch K25 is connected to one end of the oil pump buffer resistor. The other end of the oil pump buffer resistor is connected to the positive terminal of the oil pump controller OPC, and the negative terminal of the oil pump controller OPC is connected to the seventh contactor K16 in the high-voltage box 2.

[0059] The battery power distribution branch includes a DC / DC controller, the positive terminal of the DC / DC controller is commonly connected to the positive terminal of the air pump controller APC and the positive terminal of the oil pump controller OPC, and the negative terminal of the DC / DC controller is connected to the seventh contactor K16 in the high-voltage box 2;

[0060] The air conditioning power distribution branch includes an air conditioning main contactor K23, an air conditioning pre-charging contactor K24 and an air conditioning buffer resistor. The air conditioning pre-charging contactor K24 and the air conditioning buffer resistor are connected in series and then connected in parallel with the air conditioning main contactor K23 to form an air conditioning switch parallel circuit. One end of the air conditioning switch parallel circuit is connected to the maintenance switch unit 23 in the high-voltage box 2, and the other end of the air conditioning switch parallel circuit is respectively connected to the positive ends of the two air conditioners, and the negative ends of the two air conditioners are connected to the seventh contactor K16 in the high-voltage box 2.

[0061] The heating device PTC power distribution branch includes a heating device switch K22, one end of the heating device switch K22 is connected to the maintenance switch unit 23 in the high-voltage box 2, the other end of the heating device switch K22 is the positive end of the heating device PTC, and the negative end of the heating device PTC is connected to the seventh contactor K16 of the high-voltage box 2;

[0062] Among them, the power-on principle of the auxiliary electrical components is as follows:

[0063] The oil pump motor power distribution switch K25 is closed to pre-charge the auxiliary drive circuit consisting of the air compressor, oil pump motor and battery. When the pre-charge voltage reaches 98% of the system voltage threshold, the air compressor power distribution switch K26 is closed. After a delay of 200ms, the oil pump motor power distribution switch K25 is disconnected to complete the power-on of the auxiliary drive.

[0064] The air conditioner pre-charging contactor K24 is closed, and the two air conditioners start pre-charging. When the pre-charging voltage reaches 98% of the system voltage threshold, the air conditioner main contactor K23 is closed. After a delay of 200ms, the air conditioner pre-charging contactor K24 is disconnected, and the two air conditioners are powered on.

[0065] The heating device switch K22 is closed, and the heating device PTC is powered on.

[0066] See also Figure 3 A high voltage system for electric heavy truck dual main drive also includes a domain controller 6, which is connected to a battery management unit BMS disposed in a high voltage box 2, the first main drive unit 3, the second main drive unit 4 and the integrated controller 5 through a CAN bus. The battery management unit BMS is also connected to a power battery through a CAN bus, and the CAN bus includes a low level data bus CANL and a high level data bus CANH.

[0067] During system operation, if one of the main drive MCU1 fails, the domain controller 6 will diagnose the main drive MCU1 failure and disconnect the first main contactor K12 of the circuit to avoid affecting another circuit; or if another main drive MCU2 fails, the domain controller 6 will diagnose the main drive MCU2 failure and disconnect the contactor K14 of the circuit.

[0068] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A high voltage system suitable for dual main drive of electric heavy trucks, characterized in that: include: A power battery (1), a high-voltage box (2), a first main drive unit (3) and a second main drive unit (4), wherein the power battery (1) is connected to the high-voltage box (2), and the high-voltage box (2) is respectively connected to the first main drive unit (3) and the second main drive unit (4).

2. The high voltage system suitable for dual main drive of electric heavy truck according to claim 1 is characterized in that: The high-voltage box (2) is provided with a first power distribution unit (21) and a second power distribution unit (22) connected in parallel, the first power distribution unit (21) being connected to the first main drive unit (3), and the second power distribution unit (22) being connected to the second main drive unit (4).

3. The high voltage system suitable for dual main drive of electric heavy truck according to claim 2 is characterized in that: The high voltage box (2) is also provided with a fifth contactor K10, at least one main positive contactor, and two main negative contactors, the two main negative contactors being a sixth contactor K15 and a seventh contactor K16 respectively; The positive terminal of the power battery (1) is respectively connected to one end of the main positive contactor, and the other end of the main positive contactor is respectively connected to one end of the first power distribution unit (21) and one end of the second power distribution unit (22) through the maintenance switch unit (23). The other end of the first power distribution unit (21) is connected to the input end of the first main drive unit (3), and the other end of the second power distribution unit (22) is connected to the input end of the second main drive unit (4). The output end of the first main drive unit (3) and the output end of the second main drive unit (4) are connected to the main negative contactor, and the main negative contactor is connected to one end of the fifth contactor K10, and the other end of the fifth contactor K10 is connected to the negative terminal of the power battery (1).

4. The high voltage system suitable for dual main drive of electric heavy truck according to claim 3 is characterized in that: The high voltage box (2) is also provided with at least one heating contactor, a heating control switch K5, at least one positive charging contactor, a fourteenth contactor K19 and at least one negative charging contactor; The main positive contactor is respectively connected to one end of the heating contactor, the other end of the heating contactor is connected to the positive end of the heating element, the negative end of the heating element is connected to one end of the heating control switch K5, and the other end of the heating control switch K5 is connected to the fifth contactor K10; one end of the charging positive contactor is connected to the positive end of the charger, the other end of the charging positive contactor is connected to the main positive contactor, one end of the fourteenth contactor K19 is connected to the positive end of the water cooling unit, and the negative end of the water cooling unit is connected to the fifth contactor K10; one end of the charging negative contactor is connected to the negative end of the charger, and the other end of the charging negative contactor is commonly connected to the fifth contactor K10.

5. The high voltage system suitable for dual main drive of electric heavy truck according to claim 3 is characterized in that: The first power distribution unit (21) comprises a first buffer resistor R1, a first pre-charging contactor K11 and a first main contactor K12; the maintenance switch unit (23) is connected to one end of the first buffer resistor R1 and the first main contactor K12 respectively; the other end of the first buffer resistor R1 is connected to one end of the first pre-charging contactor K11; the other end of the first pre-charging contactor K11 and the other end of the first main contactor K12 are connected to the first main drive unit (3).

6. The high voltage system suitable for dual main drive of electric heavy truck according to claim 3 is characterized in that: The second power distribution unit (22) comprises a second buffer resistor R2, a second pre-charging contactor K13 and a second main contactor K14; the maintenance switch unit (23) is respectively connected to one end of the second buffer resistor R2 and the second main contactor K14; the other end of the second buffer resistor R2 is connected to one end of the second pre-charging contactor K13; the other end of the second pre-charging contactor K13 and the other end of the second main contactor K14 are commonly connected to the second main drive unit (4).

7. The high voltage system suitable for dual main drive of electric heavy truck according to claim 3 is characterized in that: The first main drive unit (3) comprises a first motor M1 and a first single-chip microcomputer MCU1 for controlling the driving of the first motor M1; the first power distribution unit (21) is connected to the positive terminal of the first single-chip microcomputer MCU1 via the input terminal of the first main drive unit (3); and the negative terminal of the first single-chip microcomputer MCU1 is connected to the sixth contactor K15 via the output terminal of the first main drive unit (3).

8. The high voltage system suitable for dual main drive of electric heavy truck according to claim 3 is characterized in that: The second main drive unit (4) comprises a second motor M2 and a second single-chip microcomputer MCU2 for controlling the driving of the second motor M2; the second power distribution unit (22) is connected to the positive terminal of the second single-chip microcomputer MCU2 via the input terminal of the second main drive unit (4); and the negative terminal of the second single-chip microcomputer MCU2 is connected to the sixth contactor K15 via the output terminal of the second main drive unit (4).

9. The high voltage system suitable for dual main drive of electric heavy truck according to any one of claims 3 to 7, characterized in that: It also includes an integrated controller (5) for controlling a plurality of auxiliary electrical components, wherein the positive terminal of the integrated controller (5) is connected to the maintenance switch unit (23) in the high-voltage box (2), and the negative terminal of the integrated controller (5) is connected to the seventh contactor K16 in the high-voltage box (2); the integrated controller (5) is provided with a plurality of power distribution branches, one end of each power distribution branch is connected to the maintenance switch unit (23) in the high-voltage box (2), the other end of each power distribution branch is connected to the positive terminal of an auxiliary electrical component, and the negative terminal of each auxiliary electrical component is connected to the seventh contactor K16 in the high-voltage box (2).

10. The high voltage system suitable for dual main drive of electric heavy truck according to claim 9, characterized in that: It also includes a domain controller (6), which is respectively connected to the first main drive unit (3), the second main drive unit (4), the integrated controller (5) and a battery management unit BMS arranged in the high-voltage box (2) via a CAN bus.

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