High-voltage system for double high-voltage platforms of electric heavy truck

Abstract

The utility model provides a high-voltage system for double high-voltage platforms of an electric heavy truck, which relates to the technical field of new energy electric automobiles and comprises a power battery, a battery distribution box, a first high-voltage platform, a second high-voltage platform and a high-voltage direct-current converter. The battery distribution box is connected with the first high-voltage platform and the high-voltage direct-current converter, and the high-voltage direct-current converter is connected with the second high-voltage platform. According to the utility model, the reliability of the high-voltage system is improved, the compatibility of the voltage range of the system is improved, and the system is effectively suitable for a higher-voltage platform and adapts to more charging pile resources.

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 of a dual-high-voltage platform of an electric heavy-duty truck. Background Art

[0002] With the rapid improvement of global environmental protection awareness and the transformation of energy structure towards cleaner and lower-carbon energy, electric heavy trucks, as a shining star in the field of new energy vehicles, are gradually changing the dominant position of traditional fuel heavy trucks in the logistics and transportation industry and becoming the focus of attention inside and outside the industry. Electric heavy trucks have received widespread attention from the industry for their many advantages such as no exhaust emissions, low noise pollution and efficient energy utilization.

[0003] At present, the high-voltage system of new energy electric heavy-duty trucks generally chooses to adopt an 800V voltage platform in order to have higher energy density and faster charging speed. This puts forward higher requirements on the insulation performance, voltage resistance, heat dissipation efficiency and other aspects of high-voltage components. However, due to the immaturity and low reliability of some high-voltage components, the widespread application of the 800V voltage platform in electric heavy-duty trucks is limited to a certain extent, and it is difficult to adapt to the charging pile market with a higher voltage platform; on the existing 800V voltage platform of the whole vehicle, since some vehicle manufacturers may choose to use components of different voltage platforms on the same vehicle, some high-voltage components may still use the technology of the 600V voltage platform, and the components of these two different voltage platforms may differ in electrical performance, interface type and safety standards. It is impossible to guarantee that the high-voltage components of these two different voltage platforms can achieve seamless docking and efficient collaboration. Therefore, this mixed use method will bring about the problem of incompatibility of voltage ranges. Utility Model Content

[0004] In order to solve the problems in the above-mentioned prior art that some high-voltage components have low reliability, incompatible voltage ranges, and difficulty in adapting to higher voltage platforms, the utility model proposes a high-voltage system for an electric heavy-duty truck with a dual high-voltage platform, which improves the reliability of the high-voltage system, improves the compatibility of the system voltage range, effectively adapts to higher voltage platforms, and adapts to more charging pile resources.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0006] A high-voltage system for a dual high-voltage platform of an electric heavy-duty truck, the system comprising a power battery, a battery distribution box, a first high-voltage platform and a second high-voltage platform, and also comprising a high-voltage DC converter, the power battery being connected to the battery distribution box, the battery distribution box being respectively connected to the first high-voltage platform and the high-voltage DC converter, and the high-voltage DC converter being connected to the second high-voltage platform.

[0007] Here, the battery distribution box is connected through the power battery, the battery distribution box is respectively connected to the first high-voltage platform and the high-voltage DC converter, the high-voltage DC converter is connected to the second high-voltage platform, the first high-voltage platform is distributed through the battery distribution box, and the second high-voltage platform is powered by converting the electric energy of the battery distribution box into a voltage suitable for the second high-voltage platform by using the high-voltage DC converter, thereby realizing the power supply of dual high-voltage platforms, ensuring that the high-voltage system can effectively be compatible with the high-voltage components of the two high-voltage platforms, supporting the coexistence of components of the dual high-voltage platforms, improving the reliability of the high-voltage system, and improving the compatibility of the system voltage range, effectively applicable to higher voltage platforms, and adapting to more charging pile resources.

[0008] Preferably, it also includes a first charging seat, a second charging seat and a domain controller XCU, the first charging seat is connected to the battery distribution box, the second charging seat is connected to the second high-voltage platform, the domain controller XCU is respectively connected to the first high-voltage platform, the high-voltage DC converter, the second high-voltage platform and the battery management unit BMS, and the battery management unit BMS is arranged in the battery distribution box.

[0009] Here, the first charging seat is connected to the battery distribution box to provide one of the charging interfaces, thereby ensuring the charging efficiency and safety of the power battery; the second charging seat is connected to the second high-voltage platform to provide another charging interface, which increases the flexibility of the high-voltage system when the second high-voltage platform needs to be charged independently or quickly; the domain controller XCU, as a vehicle-level software function integration platform, realizes centralized management and control of the entire high-voltage system by connecting the first high-voltage platform, the high-voltage DC converter, the second high-voltage platform and the battery management unit BMS. The domain controller XCU enables the high-voltage system to perform energy distribution, fault diagnosis, safety protection and other operations 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 implement more accurate battery management strategies, such as charging control, thermal management, fault diagnosis, etc., thereby extending the service life of the power battery and improving system reliability.

[0010] Preferably, the battery distribution box is provided with a first distribution unit, a second distribution unit and at least one positive contactor; the positive terminal of the power battery is connected to one end of the positive contactor, the other end of the positive contactor is respectively connected to the positive terminals of the first charging seat, the first high-voltage platform and the high-voltage DC converter through a maintenance switch unit, the negative terminal of the first charging seat is connected to the negative terminal of the power battery, the negative terminal of the first high-voltage platform is connected to the negative terminal of the power battery through the first distribution unit, and the negative terminal of the high-voltage DC converter is connected to the negative terminal of the power battery through the second distribution unit.

[0011] Here, the on-off control of at least one positive contactor, the first power distribution unit and the second power distribution unit is utilized to ensure a reasonable power distribution strategy of the battery distribution box to the first high-voltage platform and the second high-voltage platform.

[0012] Preferably, the first power distribution unit includes a first buffer resistor R1, a sixth contactor K12 and a seventh contactor K17;

[0013] The negative terminal of the first high-voltage platform is respectively connected to one end of the first buffer resistor R1 and the sixth contactor K12, the other end of the first buffer resistor R1 is connected to one end of the seventh contactor K17, and the other ends of the seventh contactor K17 and the sixth contactor K12 are commonly connected to the negative terminal of the power battery.

[0014] Here, the first buffer resistor R1, the sixth contactor K12 and the seventh contactor K17 work in coordination to provide sufficient guarantee for the first power distribution unit to distribute power to the first high-voltage platform.

[0015] Preferably, the second power distribution unit comprises a second buffer resistor R2, an eighth contactor K19 and a ninth contactor K18;

[0016] The high-voltage DC converter is respectively connected to the second buffer resistor R2 and one end of the eighth contactor K19, the other end of the second buffer resistor R2 is connected to one end of the ninth contactor K18, and the other ends of the ninth contactor K18 and the eighth contactor K19 are commonly connected to the negative terminal of the power battery.

[0017] Here, through the cooperation of the second buffer resistor R2, the eighth contactor K19 and the ninth contactor K18, the second power distribution unit provides electric energy to the high-voltage DC converter, so that the high-voltage DC converter converts the electric energy of the battery distribution box into a voltage suitable for the requirements of the second high-voltage platform for power supply.

[0018] Preferably, the first high-voltage platform includes a first single-chip microcomputer MCU1 for controlling the first motor M1 and a second single-chip microcomputer MCU2 for controlling the second motor M2, the positive terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are commonly connected to the maintenance switch unit of the battery distribution box, and the negative terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are commonly connected to the first distribution unit of the battery distribution box.

[0019] Here, the first power distribution unit of the battery distribution box is used to supply power to the first microcontroller MCU1 and the second microcontroller MCU2, respectively, so that the first microcontroller MCU1 drives the first motor M1 and the second microcontroller MCU2 drives the second motor M2.

[0020] Preferably, the second high-voltage platform is provided with a third power distribution unit for controlling the driving of the auxiliary drive, a fourth power distribution unit for controlling the driving of the electric auxiliary components, and a charging switch K13 for controlling the power distribution of the second charging station;

[0021] The positive terminal of the high-voltage DC converter is respectively connected to one end of the charging switch K13, the third power distribution unit and the fourth power distribution unit, the other end of the charging switch K13 is connected to the positive terminal of the second charging socket, the other end of the third power distribution unit is connected to the positive terminal of the auxiliary drive component, the other end of the fourth power distribution unit is connected to the positive terminal of the electrical auxiliary component, and the negative terminals of the auxiliary drive component, the electrical auxiliary component and the second charging socket are commonly connected to the negative terminal of the high-voltage DC converter.

[0022] Here, a high-voltage DC converter is used to convert the electric energy of the battery distribution box into electric energy suitable for the third distribution unit, the fourth distribution unit and the charging switch K13, so as to facilitate the third distribution unit to drive the auxiliary drive components, the fourth distribution unit to drive the electrical accessories and control the power distribution of the second charging station.

[0023] Preferably, the auxiliary drive components include an electric heater PTC, an electric air conditioner and at least one water cooling unit, and the electric auxiliary components include a battery, an oil pump motor M3 and an air compressor M4.

[0024] Here, the water-cooling unit provides efficient cooling and heat dissipation to ensure that the high-voltage system can operate stably even in high-temperature environments; the electric heater PTC has high heat exchange efficiency and can heat up quickly. In cold environments, it can quickly increase the system temperature to ensure the normal operation of the high-voltage system; the electric air conditioner realizes intelligent temperature control to provide a comfortable driving environment for the cab and ensure that the cab always maintains a suitable temperature; the battery, as one of the auxiliary drive components, provides a stable power supply for the entire vehicle; the oil pump motor M3 is responsible for providing a stable fuel supply for the engine, ensuring that the engine can obtain sufficient fuel under any operating conditions to ensure the power and economy of the entire vehicle; the air compressor M4 provides stable air pressure for the entire vehicle.

[0025] Preferably, the third power distribution unit includes at least one water cooling unit contactor, a twelfth contactor K22, a thirteenth contactor K23, a fourteenth contactor K24 and a third buffer resistor R3;

[0026] One end of the water cooling unit contactor, the twelfth contactor K22, the thirteenth contactor K23, the fourteenth contactor K24 and the charging switch K13 are connected to the positive terminal of the high-voltage DC converter, the other end of the water cooling unit contactor is connected to the positive terminal of the water cooling unit, the other end of the twelfth contactor K22 is connected to the positive terminal of the electric heater PTC, the other end of the thirteenth contactor K23 is connected to one end of the third buffer resistor R3, the other ends of the third buffer resistor R3 and the fourteenth contactor K24 are connected to the positive terminal of the electric air conditioner, and the negative terminals of the water cooling unit, the electric heater PTC and the electric air conditioner are connected to the negative terminal of the high-voltage DC converter.

[0027] Here, the cooperation of the water cooling unit contactor, the twelfth contactor K22, the thirteenth contactor K23, the fourteenth contactor K24 and the third buffer resistor R3 is utilized to provide protection for the third power distribution unit to drive the auxiliary drive components.

[0028] Preferably, the fourth power distribution unit includes a fifteenth contactor K25, a sixteenth contactor K26, a fourth buffer resistor R4, a low-voltage DC converter for controlling battery charging, an oil pump controller OPC for controlling the drive of the oil pump motor M3, and an air pump controller APC for controlling the drive of the air compressor M4;

[0029] The positive terminal of the high-voltage DC converter is connected to one end of the fifteenth contactor K25 and the sixteenth contactor K26, the other end of the sixteenth contactor K26 is connected to one end of the fourth buffer resistor R4, the other end of the fourth buffer resistor R4 is connected to the other end of the fifteenth contactor K25, and the other end of the fifteenth contactor K25 is respectively connected to the positive terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC, and the negative terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC are commonly connected to the negative terminal of the high-voltage DC converter.

[0030] Here, the cooperation of the fifteenth contactor K25, the sixteenth contactor K26 and the fourth buffer resistor R4 is utilized to provide important power distribution strategy guarantee for the fourth power distribution unit to drive the low voltage DC converter, the oil pump controller OPC and the air pump controller APC.

[0031] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0032] The utility model proposes a high-voltage system for an electric heavy-duty truck with dual high-voltage platforms, which is connected to a battery distribution box through a power battery, the battery distribution box is respectively connected to a first high-voltage platform and a high-voltage DC converter, the high-voltage DC converter is connected to the second high-voltage platform, the first high-voltage platform is powered by the battery distribution box, and the second high-voltage platform is powered by converting the electric energy of the battery distribution box into a voltage suitable for the demand of the second high-voltage platform, thereby realizing the power supply of the dual high-voltage platforms and ensuring that the high-voltage system can effectively be compatible with the high-voltage components of the two high-voltage platforms, supporting the coexistence of components of the dual high-voltage platforms, improving the reliability of the high-voltage system, and improving the compatibility of the system voltage range, making it effectively suitable for higher voltage platforms and adapting to more charging pile resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A first block diagram showing a high voltage system of a dual high voltage platform for an electric heavy truck proposed in an embodiment of the utility model;

[0034] Figure 2 A second block diagram showing a high voltage system of a dual high voltage platform for an electric heavy truck proposed in an embodiment of the utility model;

[0035] Figure 3 A third block diagram showing a high voltage system of a dual high voltage platform for an electric heavy truck proposed in an embodiment of the utility model.

[0036] 1. Power battery; 2. Battery distribution box; 21. First distribution unit; 22. Second distribution unit; 23. Maintenance switch unit; 3. First high-voltage platform; 4. High-voltage DC converter; 5. Second high-voltage platform; 51. Third distribution unit; 52. Fourth distribution unit; 6. First charging station; 7. Second charging station. DETAILED DESCRIPTION

[0037] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0038] 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;

[0039] It is understandable to those skilled in the art that some well-known contents may be omitted in the drawings;

[0040] 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;

[0041] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment proposes a high-voltage system for an electric heavy-duty truck with dual high-voltage platforms, the system comprising a power battery 1, a battery distribution box 2, a first high-voltage platform 3 and a second high-voltage platform 5, and is characterized in that it also comprises a high-voltage DC converter 4, the power battery 1 is connected to the battery distribution box 2, the battery distribution box 2 is respectively connected to the first high-voltage platform 3 and the high-voltage DC converter 4, and the high-voltage DC converter 4 is connected to the second high-voltage platform 5.

[0044] In this embodiment, a high-voltage system of a dual high-voltage platform of an electric heavy-duty truck is proposed, which realizes efficient power supply and compatibility of two different voltage platforms. The high-voltage system is connected to a battery distribution box 2 through a power battery 1. The battery distribution box 2 plays a vital role as the center of power distribution. First, the battery distribution box 2 is directly connected to the first high-voltage platform 3 to provide stable and reliable power for the first high-voltage platform 3. This direct power supply method ensures that the first high-voltage platform 3 can operate efficiently and safely; secondly, in order to support the operation of the second high-voltage platform 5, a high-voltage DC converter 4 is introduced. The high-voltage DC converter 4 can convert the power provided by the battery distribution box 2 into a voltage suitable for the requirements of the second high-voltage platform 5, which not only ensures that the second high-voltage platform can obtain the required power, but also further improves the performance of the entire system by optimizing the power conversion efficiency. The high-voltage system proposed in this embodiment successfully realizes the power supply to dual high-voltage platforms, that is, it simultaneously meets the power requirements of the first high-voltage platform and the second high-voltage platform, so that the high-voltage system can effectively be compatible with high-voltage components of two different voltage platforms, support the coexistence and use of components of dual high-voltage platforms, improve the reliability of the high-voltage system, and improve the compatibility of the system voltage range, effectively applicable to higher voltage platforms, and adapt to more charging pile resources.

[0045] Example 2

[0046] See also Figure 2The high-voltage system also includes a first charging seat 6, a second charging seat 7 and a domain controller XCU. The first charging seat 6 is connected to the battery distribution box 2, and the second charging seat 7 is connected to the second high-voltage platform 5. The domain controller XCU is connected to the first high-voltage platform 3, the high-voltage DC converter 4, the second high-voltage platform 5 and the battery management unit BMS through a CAN bus. The battery management unit BMS is arranged in the battery distribution box 2. The first high-voltage platform 3 is a motor control unit, and the second high-voltage platform 5 is an all-in-one controller; the first charging seat is connected to the battery distribution box to provide one of the charging interfaces, thereby ensuring the charging efficiency and safety of the power battery; the second charging seat is connected to the second high-voltage platform to provide another charging interface, which increases the flexibility of the high-voltage system when the second high-voltage platform needs to be charged independently or quickly; the domain controller XCU, as a vehicle-level software function integration platform, realizes centralized management and control of the entire high-voltage system by connecting the first high-voltage platform, the high-voltage DC converter, the second high-voltage platform and the battery management unit BMS. The domain controller XCU enables the high-voltage system to perform energy distribution, fault diagnosis, safety protection and other operations more efficiently, thereby improving the intelligence level of the system, and is also used to control the output voltage and maximum output current of the high-voltage DC converter 4; 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 conjunction with the domain controller XCU to achieve more accurate battery management strategies, such as charging control, thermal management, fault diagnosis, etc., thereby extending the service life of the power battery and improving system reliability. The CAN bus includes a low-level data bus CANL and a high-level data bus CANH. The mode of transmitting data through the low-level data bus CANL and the high-level data bus CANH is differential signal transmission. This differential signal transmission mode can effectively resist external electromagnetic interference and improve the reliability of data transmission.

[0047] The battery distribution box 2 comprises a first distribution unit 21, a second distribution unit 22 and five positive contactors, wherein the five positive contactors are respectively a first contactor K7, a second contactor K8, a third contactor K9, a fourth contactor K10 and a fifth contactor K11;

[0048] The positive terminal of the power battery 1 is respectively connected to one end of the first contactor K7, the second contactor K8, the third contactor K9, the fourth contactor K10 and the fifth contactor K11, and the other ends of the first contactor K7, the second contactor K8, the third contactor K9, the fourth contactor K10 and the fifth contactor K11 are respectively connected to the positive terminals of the first charging seat 6, the first high-voltage platform 3 and the high-voltage DC converter 4 through the maintenance switch unit 23, the negative terminal of the first charging seat 6 is connected to the negative terminal of the power battery 1, and the negative terminal of the first high-voltage platform 3 is connected to the negative terminal of the power battery 1 through the first power distribution unit 21. The negative terminal of the high-voltage DC converter 4 is connected to the negative terminal of the power battery 1 through the second power distribution unit 22; wherein the maintenance switch unit 23 includes a first maintenance switch K16, a second maintenance switch MSD1, a third maintenance switch MSD2 and a protection switch Q1 connected in parallel, the first maintenance switch K16 is connected to the positive terminal of the first charging seat, the second maintenance switch MSD1 and the third maintenance switch MSD2 are connected to the positive terminal of the first high-voltage platform 3, and the protection switch Q1 is connected to the positive terminal of the high-voltage DC converter 4; by using at least one positive contactor, the on-off control of the first power distribution unit and the second power distribution unit, the reasonable power distribution strategy of the battery distribution box to the first high-voltage platform and the second high-voltage platform is ensured.

[0049] The first power distribution unit 21 includes a first buffer resistor R1, a sixth contactor K12 and a seventh contactor K17;

[0050] The negative terminal of the first high-voltage platform 3 is respectively connected to the first buffer resistor R1 and one end of the sixth contactor K12, the other end of the first buffer resistor R1 is connected to one end of the seventh contactor K17, and the other ends of the seventh contactor K17 and the sixth contactor K12 are commonly connected to the negative terminal of the power battery 1. The first buffer resistor R1, the sixth contactor K12 and the seventh contactor K17 work in coordination, providing sufficient guarantee for the first power distribution unit to distribute power to the first high-voltage platform.

[0051] The second power distribution unit 22 includes a second buffer resistor R2, an eighth contactor K19 and a ninth contactor K18;

[0052] The high-voltage DC converter 4 is respectively connected to the second buffer resistor R2 and one end of the eighth contactor K19, the other end of the second buffer resistor R2 is connected to one end of the ninth contactor K18, and the other ends of the ninth contactor K18 and the eighth contactor K19 are commonly connected to the negative terminal of the power battery 1. Through the cooperation of the second buffer resistor R2, the eighth contactor K19 and the ninth contactor K18, the second power distribution unit provides electric energy to the high-voltage DC converter, so that the high-voltage DC converter converts the electric energy of the battery distribution box into a voltage suitable for the requirements of the second high-voltage platform for power supply.

[0053] The first high-voltage platform 3 includes a first single-chip microcomputer MCU1 for controlling the first motor M1 and a second single-chip microcomputer MCU2 for controlling the second motor M2. The positive terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are connected to the maintenance switch unit 23 of the battery distribution box 2, and the negative terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are connected to the first power distribution unit 21 of the battery distribution box 2. The first power distribution unit of the battery distribution box is used to supply power to the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2, respectively, so that the first single-chip microcomputer MCU1 drives the first motor M1 and the second single-chip microcomputer MCU2 drives the second motor M2.

[0054] The working principle of the high-voltage system is as follows:

[0055] The first contactor K7, the second contactor K8, the third contactor K9, the fourth contactor K10, the fifth contactor K11 and the seventh contactor K17 are closed, so that the power battery 1 and the first high-voltage platform 3 are connected in the circuit. At this time, the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 in the first high-voltage platform 3 start pre-charging. When the pre-charging voltage reaches 98% of the system voltage threshold, the sixth contactor K12 is closed, and after a delay of 200ms, the seventh contactor K17 is disconnected. At this time, the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are powered on;

[0056] The ninth contactor K18 is closed. At this time, the power battery 1 pre-charges the high-voltage DC converter 4 through the battery distribution box 2. When the pre-charge voltage reaches 98% of the system voltage threshold, the eighth contactor K19 is closed. After a delay of 200ms, the ninth contactor K18 is disconnected. At this time, the high-voltage DC converter 4 is powered on.

[0057] It should be specially stated that the power battery system composed of the power battery 1 and the battery distribution box 2 supplies power to the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2. The voltage range of the power battery system is 768V to 876V. The battery distribution box 2 outputs 800V voltage and passes through the high-voltage DC converter 4 to convert 800V into 600V DC to supply power to the second high-voltage platform 5. The high-voltage DC converter 4 is a bidirectional DC converter. Among them, adding a high-voltage DC converter to the branch output of the power battery 1 can convert 800V into 600V for use by the high-voltage electrical devices of the 600V platform of the whole vehicle. Other high-voltage devices are directly distributed by the battery distribution box. A first charging seat with a high voltage of 1000V is provided behind the battery distribution box, and a second charging seat with a high voltage of 750V is provided at the rear end of the high-voltage DC converter, and enters the power battery 1 through the high-voltage DC converter loop, which can meet the charging requirements of the two voltage platforms.

[0058] Example 3

[0059] See also Figure 3 The second high-voltage platform 5 is provided with a third power distribution unit 51 for controlling the driving of the auxiliary drive, a fourth power distribution unit 52 for controlling the driving of the electric auxiliary components, and a charging switch K13 for controlling the power distribution of the second charging station;

[0060] The positive terminal of the high-voltage DC converter 4 is respectively connected to one end of the charging switch K13, the third power distribution unit 51 and the fourth power distribution unit 52, the other end of the charging switch K13 is connected to the positive terminal of the second charging seat, the other end of the third power distribution unit 51 is connected to the positive terminal of the auxiliary drive, the other end of the fourth power distribution unit 52 is connected to the positive terminal of the electric auxiliary, and the negative terminals of the auxiliary drive, the electric auxiliary and the second charging seat are connected to the negative terminal of the high-voltage DC converter 4. The high-voltage DC converter is used to convert the electric energy of the battery distribution box into electric energy suitable for the third power distribution unit, the fourth power distribution unit and the charging switch K13, so as to facilitate the third power distribution unit to drive the auxiliary drive, the fourth power distribution unit to drive the electric auxiliary and control the power distribution of the second charging seat.

[0061] The auxiliary drive components include an electric heater PTC, an electric air conditioner and two water cooling units, and the electric auxiliary components include a battery, an oil pump motor M3 and an air compressor M4. The two water cooling units are respectively the first water cooling unit and the second water cooling unit, wherein the first water cooling unit and the second water cooling unit provide efficient cooling and heat dissipation to ensure that the high-voltage system can operate stably even in a high-temperature environment; the electric heater PTC has high heat exchange efficiency and can heat up quickly. In a cold environment, it can quickly increase the system temperature to ensure the normal operation of the high-voltage system; the electric air conditioner realizes intelligent temperature control to provide a comfortable driving environment for the cab and ensure that the cab always maintains a suitable temperature; the battery, as one of the auxiliary drive components, provides a stable power supply for the entire vehicle; the oil pump motor M3 is responsible for providing a stable fuel supply for the engine, which can ensure that the engine can obtain sufficient fuel under any working conditions to ensure the power and economy of the entire vehicle; the air compressor M4 provides a stable air pressure for the entire vehicle

[0062] The third power distribution unit 51 includes two water-cooling unit contactors, a twelfth contactor K22, a thirteenth contactor K23, a fourteenth contactor K24 and a third buffer resistor R3; wherein the two water-cooling unit contactors are the tenth contactor K20 and the eleventh contactor K21, respectively, and one end of the tenth contactor K20, the eleventh contactor K21, the twelfth contactor K22, the thirteenth contactor K23, the fourteenth contactor K24 and the charging switch K13 is connected to the positive terminal of the high-voltage DC converter 4, and the tenth contactor K20 is connected to the positive terminal of the high-voltage DC converter 4. The other end is connected to the positive terminal of the first water cooling unit, the other end of the eleventh contactor K21 is connected to the positive terminal of the second water cooling unit, the other end of the twelfth contactor K22 is connected to the positive terminal of the electric heater PTC, the other end of the thirteenth contactor K23 is connected to one end of the third buffer resistor R3, the other ends of the third buffer resistor R3 and the fourteenth contactor K24 are connected to the positive terminal of the electric air conditioner, and the negative terminals of the first water cooling unit, the second water cooling unit, the electric heater PTC and the electric air conditioner are connected to the negative terminal of the high-voltage DC converter 4. The tenth contactor K20, the eleventh contactor K21, the twelfth contactor K22, the thirteenth contactor K23, the fourteenth contactor K24 and the third buffer resistor R3 are used to cooperate to provide protection for the third power distribution unit to drive the auxiliary drive components.

[0063] The fourth power distribution unit 52 includes a fifteenth contactor K25, a sixteenth contactor K26, a fourth buffer resistor R4, a low-voltage DC converter for controlling battery charging, an oil pump controller OPC for controlling the drive of the oil pump motor M3, and an air pump controller APC for controlling the drive of the air compressor M4;

[0064] The positive terminal of the high-voltage DC converter 4 is connected to one end of the fifteenth contactor K25 and the sixteenth contactor K26, the other end of the sixteenth contactor K26 is connected to one end of the fourth buffer resistor R4, the other end of the fourth buffer resistor R4 is connected to the other end of the fifteenth contactor K25, the other end of the fifteenth contactor K25 is respectively connected to the positive terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC, and the negative terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC are commonly connected to the negative terminal of the high-voltage DC converter 4. The cooperation of the fifteenth contactor K25, the sixteenth contactor K26 and the fourth buffer resistor R4 is utilized to provide important power distribution strategy guarantee for the fourth power distribution unit to drive the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC, and the power-on principle of the second high-voltage platform 5 is as follows:

[0065] The sixteenth contactor K26 is closed, and the auxiliary drive components consisting of the battery, the oil pump motor M3 and the air compressor M4 begin to be pre-charged. When the pre-charge voltage reaches 98% of the system voltage threshold, the fifteenth contactor K25 is closed. After a delay of 200ms, the sixteenth contactor K26 is disconnected to complete the power-on of the auxiliary drive components;

[0066] The thirteenth contactor K23 is closed, and the electric drive component starts precharging. When the precharging voltage reaches 98% of the system voltage threshold, the fourteenth contactor K24 is closed. After a delay of 200ms, the thirteenth contactor K23 is disconnected to complete the power-on of the electric air conditioner;

[0067] The tenth contactor K20, the eleventh contactor K21 and the twelfth contactor K22 are closed to complete the power-on of the first water cooling unit, the second water cooling unit and the electric heater PTC;

[0068] In this embodiment, a battery distribution box is used to connect the first charging seat, and a seventeenth contactor 16 is provided on the circuit connecting the battery distribution box and the first charging seat, and a high-voltage DC converter is connected to the second charging seat, wherein the first charging seat forms a loop including the seventeenth contactor 16, the first contactor K7, the second contactor K8, the third contactor K9, the fourth contactor K10 and the fifth contactor K11. First, the battery system composed of the power battery 1 and the battery distribution box 2 performs a power-on process, and then closes the seventeenth contactor 16, so that the first charging seat forms a loop and is energized, and the charging process of the first charging seat begins; the second charging seat forms a loop charging switch K13, the battery distribution box 2, the first contactor K7, the second contactor K8, the third contactor K9, the fourth contactor K10, the fifth contactor K11, the eighth contactor K19 and the ninth contactor K18. First, the battery distribution box performs a power-on process, and then closes the charging switch K13 so that the second charging seat forms a loop and is energized, and the charging process of the second charging seat begins.

[0069] 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 for a dual high voltage platform of an electric heavy truck, the system comprising a power battery (1), a battery distribution box (2), a first high voltage platform (3) and a second high voltage platform (5), characterized in that: It also includes a high-voltage direct current converter (4), the power battery (1) is connected to a battery distribution box (2), the battery distribution box (2) is respectively connected to the first high-voltage platform (3) and the high-voltage direct current converter (4), and the high-voltage direct current converter (4) is connected to the second high-voltage platform (5); It also comprises a first charging seat (6), a second charging seat (7) and a domain controller XCU, wherein the first charging seat (6) is connected to the battery distribution box (2), the second charging seat (7) is connected to the second high-voltage platform (5), and the domain controller XCU is respectively connected to the first high-voltage platform (3), the high-voltage direct current converter (4), the second high-voltage platform (5) and a battery management unit BMS, and the battery management unit BMS is arranged in the battery distribution box (2); The battery distribution box (2) is provided with a first distribution unit (21), a second distribution unit (22) and at least one positive contactor; the positive terminal of the power battery (1) is connected to one end of the positive contactor, the other end of the positive contactor is respectively connected to the positive terminals of the first charging seat (6), the first high-voltage platform (3) and the high-voltage direct current converter (4) through a maintenance switch unit (23), the negative terminal of the first charging seat (6) is connected to the negative terminal of the power battery (1), the negative terminal of the first high-voltage platform (3) is connected to the negative terminal of the power battery (1) through the first distribution unit (21), and the negative terminal of the high-voltage direct current converter (4) is connected to the negative terminal of the power battery (1) through the second distribution unit (22).

2. The high voltage system of the electric heavy truck dual high voltage platform according to claim 1 is characterized in that: The first power distribution unit (21) comprises a first buffer resistor R1, a sixth contactor K12 and a seventh contactor K17; The negative terminal of the first high-voltage platform (3) is respectively connected to one end of the first buffer resistor R1 and the sixth contactor K12, the other end of the first buffer resistor R1 is connected to one end of the seventh contactor K17, and the other ends of the seventh contactor K17 and the sixth contactor K12 are commonly connected to the negative terminal of the power battery (1).

3. The high voltage system of the electric heavy truck dual high voltage platform according to claim 1 is characterized in that: The second power distribution unit (22) comprises a second buffer resistor R2, an eighth contactor K19 and a ninth contactor K18; The high-voltage direct current converter (4) is respectively connected to the second buffer resistor R2 and one end of the eighth contactor K19, the other end of the second buffer resistor R2 is connected to one end of the ninth contactor K18, and the other ends of the ninth contactor K18 and the eighth contactor K19 are commonly connected to the negative terminal of the power battery (1).

4. The high voltage system of the electric heavy truck dual high voltage platform according to claim 1 is characterized in that: The first high-voltage platform (3) comprises a first single-chip microcomputer MCU1 for controlling a first motor M1 and a second single-chip microcomputer MCU2 for controlling a second motor M2, wherein the positive terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are connected to a maintenance switch unit (23) of the battery distribution box (2), and the negative terminals of the first single-chip microcomputer MCU1 and the second single-chip microcomputer MCU2 are connected to a first distribution unit (21) of the battery distribution box (2).

5. The high voltage system of the electric heavy truck dual high voltage platform according to claim 1 is characterized in that: The second high-voltage platform (5) is provided with a third power distribution unit (51) for controlling the driving of the auxiliary drive component, a fourth power distribution unit (52) for controlling the driving of the electric auxiliary component, and a charging switch K13 for controlling the power distribution of the second charging seat; The positive terminal of the high-voltage DC converter (4) is respectively connected to one end of the charging switch K13, the third power distribution unit (51) and the fourth power distribution unit (52); the other end of the charging switch K13 is connected to the positive terminal of the second charging seat; the other end of the third power distribution unit (51) is connected to the positive terminal of the auxiliary drive component; the other end of the fourth power distribution unit (52) is connected to the positive terminal of the electrical auxiliary component; and the negative terminals of the auxiliary drive component, the electrical auxiliary component and the second charging seat are commonly connected to the negative terminal of the high-voltage DC converter (4).

6. The high voltage system of the electric heavy truck dual high voltage platform according to claim 5 is characterized in that: The auxiliary drive components include an electric heater PTC, an electric air conditioner and at least one water cooling unit, and the electric auxiliary components include a battery, an oil pump motor M3 and an air compressor M4.

7. The high voltage system of the electric heavy truck dual high voltage platform according to claim 5 is characterized in that: The third power distribution unit (51) comprises at least one water cooling unit contactor, a twelfth contactor K22, a thirteenth contactor K23, a fourteenth contactor K24 and a third buffer resistor R3; One end of the water cooling unit contactor, the twelfth contactor K22, the thirteenth contactor K23, the fourteenth contactor K24 and the charging switch K13 is connected to the positive terminal of the high-voltage DC converter (4), the other end of the water cooling unit contactor is connected to the positive terminal of the water cooling unit, the other end of the twelfth contactor K22 is connected to the positive terminal of the electric heater PTC, the other end of the thirteenth contactor K23 is connected to one end of the third buffer resistor R3, the other ends of the third buffer resistor R3 and the fourteenth contactor K24 are connected to the positive terminal of the electric air conditioner, and the negative terminals of the water cooling unit, the electric heater PTC and the electric air conditioner are connected to the negative terminal of the high-voltage DC converter (4).

8. The high voltage system of the electric heavy truck dual high voltage platform according to claim 6 is characterized in that: The fourth power distribution unit (52) comprises a fifteenth contactor K25, a sixteenth contactor K26, a fourth buffer resistor R4, a low voltage DC converter for controlling battery charging, an oil pump controller OPC for controlling the driving of the oil pump motor M3, and an air pump controller APC for controlling the driving of the air compressor M4; The positive terminal of the high-voltage DC converter (4) is connected to one end of the fifteenth contactor K25 and the sixteenth contactor K26, the other end of the sixteenth contactor K26 is connected to one end of the fourth buffer resistor R4, the other end of the fourth buffer resistor R4 is connected to the other end of the fifteenth contactor K25, the other end of the fifteenth contactor K25 is respectively connected to the positive terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC, and the negative terminals of the low-voltage DC converter, the oil pump controller OPC and the air pump controller APC are commonly connected to the negative terminal of the high-voltage DC converter (4).

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