A power battery for pure electric trucks

Abstract

The present invention provides a power battery for a pure electric truck, comprising a battery compartment; a battery module and a high-voltage distribution board are arranged in the battery compartment; the battery compartment is integrated into the chassis frame or the back battery frame of the pure electric truck; the positive electrode of the battery module is electrically connected to the positive input terminal of the high-voltage distribution module; the negative electrode of the battery module is electrically connected to the negative input terminal of the high-voltage distribution module; the signal terminal of the battery module is electrically connected to the BMS controller; the positive electrode of the DC charging seat is electrically connected to the DC positive output terminal of the high-voltage distribution module, and the negative electrode of the DC charging seat is electrically connected to the DC negative output terminal of the high-voltage distribution module; the main circuit high-voltage connector is arranged on the outer shell surface of the battery compartment, the main circuit positive output terminal of the high-voltage distribution module is electrically connected to the positive input terminal of the main circuit high-voltage connector; the main circuit negative output terminal of the high-voltage distribution module is electrically connected to the negative input terminal of the main circuit high-voltage connector. The present invention has high compatibility and reduced cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of power battery high voltage systems, and in particular relates to a power battery for a pure electric truck. Background Art

[0002] The high-voltage power distribution system is one of the important subsystems of the electric truck power battery system. Its main function is to realize the distribution of electric energy of the battery system according to the actual needs of the vehicle. The high-voltage power distribution system of electric trucks is generally sealed in a high-voltage distribution box, which mainly includes a high-voltage DC charging module, a vehicle drive power supply module, a battery thermal management system power supply module, a high-voltage monitoring module, a current detection module, and a battery management system main control module (BCU) is also integrated in some products; high-voltage connectors, low-voltage control connectors, manual maintenance switches (MSD), vent valves, etc. are set outside the box.

[0003] In recent years, as the development of electric trucks has put forward higher and higher requirements for improving the energy density of power battery systems and the space utilization of the entire vehicle, an integrated technology route that directly integrates battery modules into the truck chassis frame or rear battery frame has attracted the attention of the industry.

[0004] The above technical route requires a sealed battery compartment with structural bearing function to be provided on the chassis frame or the rear battery frame, and several or at most twenty battery modules are installed in the battery compartment. Compared with the battery box, the module eliminates some structural parts, has a smaller outer dimension, and is flexible in layout, so it can increase the energy density of the battery system and improve the utilization efficiency of the vehicle space to a certain extent.

[0005] However, the use of the common high-voltage distribution box in the industry to deal with the above-mentioned module integrated battery system technology route has the following objective disadvantages:

[0006] 1) Low compatibility. The traditional high-voltage distribution box solution requires the installation of a large number of high-voltage connectors, low-voltage connectors and MSDs outside the box. For battery systems with different numbers of branches, different design solutions must be adopted for each functional module within the limited space of the high-voltage distribution box, resulting in low compatibility of the high-voltage distribution box, long product development cycle and high development cost.

[0007] 2) The cost is relatively high. The traditional high-voltage distribution box solution requires high-voltage connectors and other components to be installed outside the box. Taking a battery system with three branches in parallel as an example, the modules in the sealed battery cabin are mainly connected with copper busbars, and the high-voltage connectors on the high-voltage distribution box are not compatible with the copper busbar connection. Therefore, when the high-voltage busbar is output from the battery cabin, 6 high-voltage connectors (3 for each positive and negative poles) must be installed on the outer wall of the cabin. When the high-voltage busbar is input into the high-voltage distribution box, 6 high-voltage connectors (3 for each positive and negative poles) must also be installed outside the box. In addition to the box sealing components and air valves, the cost of the distribution box increases by more than 1,000 yuan per piece. When the battery system is connected in parallel with more branches, the above cost increase is more obvious. Summary of the invention

[0008] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a power battery for a pure electric truck with high compatibility and reduced cost.

[0009] The technical solution adopted by the present invention is: a power battery for a pure electric truck, comprising a battery compartment; a battery module and a high-voltage distribution board are arranged in the battery compartment; a high-voltage distribution module and a BMS controller are integrated on the high-voltage distribution board; the battery compartment is integrated into a chassis frame or a back battery frame of a pure electric truck; the positive electrode of the battery module is electrically connected to the positive input terminal of the high-voltage distribution module; the negative electrode of the battery module is electrically connected to the negative input terminal of the high-voltage distribution module; the signal end of the battery module is electrically connected to the BMS controller;

[0010] The DC charging seat is arranged on the outer shell surface of the battery compartment, the positive pole of the DC charging seat is electrically connected to the DC positive output terminal of the high-voltage power distribution module, and the negative pole of the DC charging seat is electrically connected to the DC negative output terminal of the high-voltage power distribution module;

[0011] The main circuit high-voltage connector is arranged on the outer shell surface of the battery compartment, and the main circuit positive output end of the high-voltage distribution module is electrically connected to the positive input end of the main circuit high-voltage connector; the main circuit negative output end of the high-voltage distribution module is electrically connected to the negative input end of the main circuit high-voltage connector.

[0012] In the above technical solution, the positive input terminal, negative input terminal, DC positive output terminal, DC negative output terminal, main circuit positive output terminal and main circuit negative output terminal of the high-voltage distribution module are all arranged on the high-voltage distribution board in the form of insulated terminals.

[0013] In the above technical solution, the battery compartment provides at least IP67 protection level.

[0014] In the above technical scheme, the high-voltage distribution module includes a DC charging positive contactor, a DC charging negative contactor, and a main negative contactor; one end of the DC charging negative contactor is connected to the negative input terminal of the high-voltage distribution module through a copper busbar via the main circuit contactor, and is also connected to the main circuit negative output terminal of the high-voltage distribution module through the copper busbar; the other end of the DC charging negative contactor is connected to the DC negative output terminal of the high-voltage distribution module through a copper busbar; one end of the DC charging positive contactor is connected to the main circuit positive output terminal of the high-voltage distribution module and the positive input terminal of the high-voltage distribution module through a copper busbar; the other end of the DC charging positive contactor is connected to the DC positive output terminal of the high-voltage distribution module through a copper busbar.

[0015] The above technical solution also includes a current sensor; the main circuit contactor is connected to the negative input terminal of the high-voltage distribution module via the current sensor.

[0016] The above technical solution also includes a TMS high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive electrode of the TMS high-voltage connector is connected to the main circuit positive output terminal, the DC positive output terminal and the positive input terminal of the high-voltage distribution module; the negative electrode of the TMS high-voltage connector is connected to the main circuit negative output terminal, the DC negative output terminal and the negative input terminal of the high-voltage distribution module;

[0017] It also includes a TMS contactor and a fuse, which are arranged on the high-voltage distribution board; one end of the TMS contactor is connected to the DC positive output terminal of the high-voltage distribution module through a copper busbar via a DC charging positive contactor, and the other end is connected to the positive pole of the TMS high-voltage connector via a fuse.

[0018] The above technical solution also includes a PTC high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive pole of the PTC high-voltage connector is connected to the positive pole of the TMS high-voltage connector; the negative pole of the TMS high-voltage connector is connected to the negative pole of the PTC high-voltage connector; the positive pole of the PTC high-voltage connector is connected to the DC positive output terminal of the high-voltage distribution module via a fuse and a TMS contactor.

[0019] The above technical solution also includes a low-voltage connector, which is arranged on the surface of the battery compartment shell; the low-voltage connector includes a debugging and diagnostic port and a vehicle low-voltage interface, which is connected to the output end of the BMS controller.

[0020] In the above technical solution, the main circuit high-voltage connector is connected to the current output insulating terminal of the high-voltage distribution board with a copper busbar; the TMS high-voltage connector, the PTC high-voltage connector, the DC charging socket and the output insulating terminal of the high-voltage distribution board are connected with a high-voltage wiring harness; the low-voltage connector is connected to the BMS controller with a low-voltage communication wiring harness.

[0021] The above technical solution also includes a manual maintenance switch, which is arranged on the surface of the battery compartment shell; and is arranged in the middle of each parallel branch of the battery module.

[0022] The beneficial effects of the present invention are as follows: the present invention simplifies the overall structure through the reasonable partitioning arrangement of each electrical component, and minimizes the types and quantities of copper bars; the high-voltage monitoring harness and the low-voltage communication harness are arranged separately, reducing the mutual interference between the two; the length and width of the distribution board are fully utilized, while the spatial distance between the positive and negative input interfaces of the busbar is enlarged, the possibility of misinstallation of the copper bar is reduced, and the high-voltage electrical safety risk is eliminated to the greatest extent; the modularity of the design is improved, and the use requirements of various different battery high-voltage distribution system configurations can be met. The present invention can be widely used in the design field of high-voltage distribution systems in the integrated technology route of directly integrating battery modules into truck chassis frames or back battery frames, integrating high-voltage distribution boards into battery compartments, and its modular design characteristics can greatly reduce the design, development, and manufacturing costs, and have important application value, solving the technical problems that the traditional high-voltage distribution box must be provided with different numbers of high-voltage connectors outside the box body, MSD, etc., resulting in large differences in internal electrical connection schemes and the need to make different deformations of the high-voltage distribution box, thereby improving the compatibility of the high-voltage distribution module.

[0023] Furthermore, in the present invention, the DC charging station, high-voltage power distribution system, etc. are arranged inside or on the surface of the battery compartment, which reduces the physical distance between components and the number of high-voltage connectors, and further improves the integration of the battery system.

[0024] Furthermore, the battery compartment of the present invention has provided at least IP67 protection level, and the high-voltage distribution module installed in the compartment does not need to be sealed and ventilated. The high-voltage distribution board makes full use of the X-direction (vehicle length direction) and Y-direction (vehicle width direction) dimensions of the battery compartment. At this time, the maximum height of the distribution board depends only on the height of the electrical components installed on it, without the influence of other additional heights, achieving the purpose of minimizing its height (Z-direction) dimension.

[0025] Furthermore, the charging positive contactor and the charging negative contactor of the present invention are respectively arranged in the positive / negative circuit of each charging seat, and are physically located as close to the charging seat as possible, thereby reducing the wiring distance while achieving the function of controlling the on and off of the corresponding charging circuit.

[0026] Furthermore, the present invention takes into account that the heating and cooling requirements of the battery system cannot occur at the same time, so the TMS water cooling and PTC heating circuits can share a TMS contactor and fuse, effectively saving cost and space.

[0027] Furthermore, the external current input / output interfaces on the high-voltage distribution board of the present invention are all arranged in the form of insulated terminals, which meets the input and output of the busbar current between modules in the form of copper busbar connection and bolt fastening. Therefore, the high-voltage connector from the high-voltage busbar from the outer wall of the battery compartment to the outside of the high-voltage distribution box can be eliminated, which is convenient for unifying the layout and fixation of electrical components on the high-voltage distribution board, thereby ensuring the simplicity of the system, improving the compatibility of the designed products, and reducing costs.

[0028] Furthermore, the manual maintenance switch (MSD) of the present invention is arranged in the middle of each parallel branch of the system. When the MSD is manually unplugged in the maintenance state, the bus output voltage is ensured to be reduced by 1 / 2, thereby reducing the maintenance safety risk. The physical installation position of the MSD is on the battery compartment shell, which is convenient for manual plugging and unplugging from the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of electrical connection of the present invention;

[0030] Figure 2 A is a schematic structural diagram of a high-voltage distribution board in a specific embodiment;

[0031] Figure 3 FIG. b is a structural schematic diagram of a high-voltage distribution board according to a specific embodiment.

[0032] Among them, 1-high-voltage distribution board, 2.1-DC charging positive contactor; 2.2-DC charging negative contactor; 3-main negative contactor; 4-current sensor; 5-BMS controller; 6-TMS contactor; 7-fuse; 8-low-voltage communication harness; 9-high-voltage monitoring harness; 10-TMS high-voltage harness; 11-insulating terminal, 12-insulating terminal; 13-current sensor fixing bracket; 14-main positive circuit copper busbar; 15-main negative circuit copper busbar; 16-charging contactor, 17-main negative contactor copper busbar; 18-current sensor copper busbar, 19-DC charging positive output terminal, 20-DC charging negative output terminal, 21-main circuit positive output terminal, 22-main circuit negative output terminal, 23-positive input terminal, 24-negative input terminal. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0034] like Figure 1As shown, the present invention provides a power battery for a pure electric truck, including a battery compartment; a battery module and a high-voltage distribution board 1 are arranged in the battery compartment; a high-voltage distribution module and a BMS controller 5 are integrated on the high-voltage distribution board 1; the battery compartment is integrated in the chassis frame or the back battery frame of the pure electric truck; the positive electrode of the battery module is electrically connected to the positive input terminal 23 of the high-voltage distribution module; the negative electrode of the battery module is electrically connected to the negative input terminal 24 of the high-voltage distribution module; the signal end of the battery module is electrically connected to the BMS controller 5;

[0035] The DC charging seat is arranged on the outer shell surface of the battery compartment, the positive pole of the DC charging seat is electrically connected to the DC charging positive output terminal 19 of the high-voltage power distribution module, and the negative pole of the DC charging seat is electrically connected to the DC charging negative output terminal 20 of the high-voltage power distribution module;

[0036] The main circuit high-voltage connector is arranged on the outer shell surface of the battery compartment, and the main circuit positive output terminal 21 of the high-voltage distribution module is electrically connected to the positive input terminal 23 of the main circuit high-voltage connector; the main circuit negative output terminal 22 of the high-voltage distribution module is electrically connected to the negative input terminal 24 of the main circuit high-voltage connector.

[0037] In a specific embodiment, the battery module includes three parallel battery branches to input the high voltage distribution board 1, such as Figure 1 The battery total positive 1 / 2 / 3 (i.e., the positive input terminal 23 of the high-voltage distribution module), the battery total negative 1 / 2 / 3 (i.e., the negative input terminal 24 of the high-voltage distribution module). The high-voltage distribution board 1 forms a dual-branch data output, such as Figure 1 The positive 1 / 2 of the main circuit (the positive output terminal 21 of the main circuit of the high-voltage distribution module), and the negative 1 / 2 of the main circuit (the negative output terminal 22 of the main circuit of the high-voltage distribution module). The DC charging seat and the high-voltage distribution system are arranged in the battery compartment, which reduces the physical distance between components and the number of high-voltage connectors, and further improves the integration of the battery system. For the battery single / dual branch input, single / three branch output, single gun DC charging and other system variations, according to the attached Figure 1 Corresponding adjustments of increasing or decreasing branches are sufficient, thereby improving the compatibility of the present invention.

[0038] Specifically, Figure 2 and Figure 3 As shown, this embodiment can meet various configurations of the battery system such as single / dual / triple branch current input, single / dual branch current output, single / dual gun DC charging, etc., realizes the modular design function of the high-voltage power distribution system, and greatly enhances the versatility of the module.

[0039] For system variations such as four or more branches of current input, three or more branches of current output, three or more guns of DC charging, there is no obvious difference in the high-voltage electrical principle. The requirements can be met by appropriately adjusting the size of this embodiment and increasing the settings of related electrical branches.

[0040] The positive input terminal 23, negative input terminal 24, DC charging positive output terminal 19, DC charging negative output terminal 20, main circuit positive output terminal 21 and main circuit negative output terminal 22 of the high-voltage distribution module are all arranged on the high-voltage distribution board 1 in the form of insulating terminals 11, which meets the input and output of the bus current between battery modules in the form of copper busbar connection and bolt fastening. Therefore, the high-voltage bus from the outer wall of the battery compartment to the high-voltage connector outside the high-voltage distribution box can be eliminated, which is convenient for unifying the layout and fixing of electrical components on the high-voltage distribution board 1, thereby ensuring the simplicity of the system, improving the compatibility of the designed products, and reducing costs.

[0041] Figure 2 The interface positions of the total positive input 1 / 2 / 3 of the battery, the positive output 1 / 2 of the main circuit, the total negative input 1 / 2 / 3, the negative output 1 / 2 of the main circuit, the positive 1 / 2 of the DC charging (i.e., the positive output terminal 19 of the DC charging of the high-voltage distribution module), and the negative 1 / 2 of the DC charging (the negative output terminal 20 of the DC charging of the high-voltage distribution module) are given. The total positive input 1 / 2 / 3 and the total negative input 1 / 2 / 3 are arranged on both sides of the distribution board respectively, increasing the space distance to avoid safety risks caused by accidental contact of the positive and negative poles during the installation of the copper busbar. The above interfaces are all connected with copper busbars and fastened with bolts. The positive output 1 / 2 of the main circuit and the negative output 1 / 2 of the main circuit are arranged opposite to the positive 1 / 2 of the DC charging and the negative 1 / 2 of the DC charging to facilitate wiring.

[0042] Figure 3 The names, positions and interconnection relationships of the components on the high-voltage distribution board 1 are given.

[0043] The base plate assembly of the high-voltage switchboard 1 can be made of stamped steel plate or aluminum alloy plate, and the surface is treated with powder spraying or electrophoretic paint. The two sides of the base plate are bent into flange surfaces, and the flange surfaces are provided with mounting holes for the installation and fixation of the entire switchboard. The bottom surface of the base plate assembly is provided with welding nuts and projection welding studs for fixing the electrical components on the switchboard.

[0044] Specifically, the battery compartment provides at least an IP67 protection level. Since the battery compartment already provides at least an IP67 protection level, the high-voltage distribution module installed in the compartment no longer needs to be sealed and breathable. The specific physical location of the high-voltage distribution board 1 can be at the bottom layer of the rear battery compartment or in the middle of the bottom battery compartment (between the two longitudinal beams of the frame). The high-voltage distribution board 1 makes full use of the X-direction (vehicle length direction) and Y-direction (vehicle width direction) dimensions of the battery compartment. At this time, the maximum height of the distribution board depends only on the height of the electrical components installed thereon, without the influence of other additional heights, thereby achieving the purpose of minimizing its height (Z-direction) dimension.

[0045] Specifically, the high-voltage power distribution module includes a DC charging positive contactor 2.1, a DC charging negative contactor 2.2, and a main negative contactor 3; one end of the DC charging negative contactor 2.2 is connected to the negative input terminal 24 of the high-voltage power distribution module through a copper busbar via the main circuit contactor, and is also connected to the main circuit negative output terminal 22 of the high-voltage power distribution module through a copper busbar; the other end of the DC charging negative contactor 2.2 is connected to the DC charging negative output terminal 20 of the high-voltage power distribution module through a copper busbar; one end of the DC charging positive contactor 2.1 is connected to the main circuit positive output terminal 21 of the high-voltage power distribution module and the positive input terminal 23 of the high-voltage power distribution module through a copper busbar; the other end of the DC charging positive contactor 2.1 is connected to the DC charging positive output terminal 19 of the high-voltage power distribution module through a copper busbar. The charging positive contactor and the charging negative contactor are respectively arranged in the positive / negative circuit of each charging seat, and the physical position should be as close to the charging seat as possible, so as to reduce the wiring distance while realizing the function of controlling the on / off of the corresponding charging circuit.

[0046] Preferably, a current sensor 4 is also included; the main circuit contactor is connected to the negative input terminal 24 of the high-voltage power distribution module via the current sensor 4. The current sensor 4 and the main negative contactor 3 are both arranged at the negative pole of the battery parallel branch, and one is arranged on the negative side of each branch. By adopting the above scheme, the on-off control of the branch current can be achieved by controlling the on-off of the main negative contactor 3 of a single branch.

[0047] Specifically, it also includes a TMS high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive electrode of the TMS high-voltage connector is connected to the main circuit positive output terminal 21, the DC charging positive output terminal 19 and the positive input terminal 23 of the high-voltage distribution module; the negative electrode of the TMS high-voltage connector is connected to the main circuit negative output terminal 22, the DC charging negative output terminal 20 and the negative input terminal 24 of the high-voltage distribution module;

[0048] It also includes a TMS contactor 6 and a fuse 7, which are arranged on the high-voltage distribution board 1; one end of the TMS contactor 6 is connected to the DC charging positive output terminal 19 of the high-voltage distribution module through a copper busbar via the DC charging positive contactor 2.1, and the other end is connected to the positive pole of the TMS high-voltage connector via the fuse 7.

[0049] Specifically, it also includes a PTC high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive pole of the PTC high-voltage connector is connected to the positive pole of the TMS high-voltage connector; the negative pole of the TMS high-voltage connector is connected to the negative pole of the PTC high-voltage connector; the positive pole of the PTC high-voltage connector is connected to the DC charging positive output terminal 19 of the high-voltage distribution module via the fuse 7 and the TMS contactor 6. Considering that the heating and cooling requirements of the battery system cannot occur at the same time, the TMS water cooling and PTC heating circuits can share a TMS contactor 6 and fuse 7, and the specific selection is checked according to the maximum voltage / current of both TMS water cooling and PTC heating.

[0050] Specifically, it also includes a low-voltage connector, which is arranged on the surface of the battery compartment shell; the low-voltage connector includes a debugging and diagnostic port and a vehicle low-voltage interface, which is connected to the output end of the BMS controller 5.

[0051] Specifically, the main circuit high-voltage connector is connected to the current output insulation terminal 11 of the high-voltage distribution board 1 with a copper busbar; the TMS high-voltage connector, the PTC high-voltage connector, and the DC charging seat are connected to the output insulation terminal 11 of the high-voltage distribution board 1 with a high-voltage harness; the low-voltage connector is connected to the BMS controller 5 with a low-voltage communication harness 8. The battery system main circuit positive / main circuit negative high-voltage connector, TMS water cooling and PTC heating high-voltage connector, DC charging seat, and low-voltage connector are all arranged on the battery compartment shell. Among them, the main circuit positive / main circuit negative high-voltage connector is connected to the current output insulation terminal 11 of the high-voltage distribution board 1 with a copper busbar; the TMS water cooling, PTC heating high-voltage connector, the DC charging seat are connected to the current output insulation terminal 11 of the high-voltage distribution board 1 with a high-voltage harness; the low-voltage connector is connected to the battery management system main control module (BCU) with a low-voltage communication harness 8.

[0052] Specifically, it also includes a manual maintenance switch, which is set on the surface of the battery compartment shell; set in the middle of each parallel branch of the battery module. The manual maintenance switch (MSD) is set in the middle of each parallel branch of the system. When the MSD is manually unplugged in the maintenance state, it ensures that the bus output voltage is reduced by 1 / 2, reducing the maintenance safety risk. Among them, the physical installation position of the MSD is on the battery compartment shell, which is convenient for manual plugging and unplugging from the outside.

[0053] Specifically, the high-voltage distribution board 1 is connected to the mounting bracket in the battery compartment at the same potential to ensure electrical safety.

[0054] In the present technical solution, the power battery system involved is all variations of the above-mentioned high-voltage power distribution system integration solution.

[0055] In this embodiment, the overall structure is simplified through the reasonable zoning and arrangement of various electrical components, and the types and quantities of copper busbars are minimized to the greatest extent; the high-voltage monitoring harness 9 and the low-voltage communication harness 8 are arranged separately to reduce mutual interference between the two; the length and width of the distribution board are fully utilized, while increasing the spatial distance between the positive and negative input interfaces of the busbar, the possibility of misinstallation of the copper busbar is reduced, and the high-voltage electrical safety risks are eliminated to the greatest extent; the modularity of the design is improved to meet the use requirements of a variety of different battery high-voltage distribution system configurations.

[0056] This technical solution can be widely used in the design of medium and high voltage distribution systems in integrated technology routes where battery modules are directly integrated into truck chassis frames or rear battery frames. Its modular design features can greatly reduce design, development and manufacturing costs, and has important application value.

[0057] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A power battery system for a pure electric truck, characterized in that: It comprises a battery compartment; a battery module and a high-voltage distribution board are arranged in the battery compartment; a high-voltage distribution module and a BMS controller are integrated on the high-voltage distribution board; the battery compartment is integrated in the chassis frame or the back battery frame of the pure electric truck; the positive electrode of the battery module is electrically connected to the positive input terminal of the high-voltage distribution module; the negative electrode of the battery module is electrically connected to the negative input terminal of the high-voltage distribution module; the signal terminal of the battery module is electrically connected to the BMS controller; the negative input terminal and the positive input terminal of the high-voltage distribution module are located on both sides of the high-voltage distribution board; The DC charging seat is arranged on the outer shell surface of the battery compartment, the positive pole of the DC charging seat is electrically connected to the DC positive output terminal of the high-voltage power distribution module, and the negative pole of the DC charging seat is electrically connected to the DC negative output terminal of the high-voltage power distribution module; The main circuit high-voltage connector is arranged on the outer shell surface of the battery compartment, and the main circuit positive output terminal of the high-voltage distribution module is electrically connected to the positive input terminal of the main circuit high-voltage connector; the main circuit negative output terminal of the high-voltage distribution module is electrically connected to the negative input terminal of the main circuit high-voltage connector; The high-voltage distribution module includes a DC charging positive contactor, a DC charging negative contactor, and a main negative contactor; one end of the DC charging negative contactor is connected to the negative input terminal of the high-voltage distribution module through a copper busbar via the main circuit contactor, and is also connected to the main circuit negative output terminal of the high-voltage distribution module through a copper busbar; the other end of the DC charging negative contactor is connected to the DC negative output terminal of the high-voltage distribution module through a copper busbar; one end of the DC charging positive contactor is connected to the main circuit positive output terminal of the high-voltage distribution module and the positive input terminal of the high-voltage distribution module through a copper busbar; the other end of the DC charging positive contactor is connected to the DC positive output terminal of the high-voltage distribution module through a copper busbar.

2. A power battery system for a pure electric truck according to claim 1, characterized in that: The positive input terminal, negative input terminal, DC positive output terminal, DC negative output terminal, main circuit positive output terminal and main circuit negative output terminal of the high-voltage distribution module are all arranged on the high-voltage distribution board in the form of insulated terminals.

3. The power battery system for a pure electric truck according to claim 1, characterized in that: The battery compartment provides at least IP67 protection level.

4. The power battery system for a pure electric truck according to claim 1, characterized in that: It also includes a current sensor; the main circuit contactor is connected to the negative input terminal of the high-voltage power distribution module via the current sensor.

5. The power battery system for a pure electric truck according to claim 1, characterized in that: It also includes a TMS high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive pole of the TMS high-voltage connector is connected to the main circuit positive output terminal, the DC positive output terminal and the positive input terminal of the high-voltage distribution module; the negative pole of the TMS high-voltage connector is connected to the main circuit negative output terminal, the DC negative output terminal and the negative input terminal of the high-voltage distribution module; It also includes a TMS contactor and a fuse, which are arranged on the high-voltage distribution board; one end of the TMS contactor is connected to the DC positive output terminal of the high-voltage distribution module through a copper busbar via a DC charging positive contactor, and the other end is connected to the positive pole of the TMS high-voltage connector via a fuse.

6. A power battery system for a pure electric truck according to claim 5, characterized in that: It also includes a PTC high-voltage connector, which is arranged on the surface of the battery compartment shell; the positive pole of the PTC high-voltage connector is connected to the positive pole of the TMS high-voltage connector; the negative pole of the TMS high-voltage connector is connected to the negative pole of the PTC high-voltage connector; the positive pole of the PTC high-voltage connector is connected to the DC positive output terminal of the high-voltage distribution module via a fuse and a TMS contactor.

7. A power battery system for a pure electric truck according to claim 6, characterized in that: It also includes a low-voltage connector, which is arranged on the surface of the battery compartment shell; the low-voltage connector includes a debugging and diagnostic port and a vehicle low-voltage interface, which is connected to the output end of the BMS controller.

8. The power battery system for a pure electric truck according to claim 7, characterized in that: The main circuit high-voltage connector is connected to the current output insulation terminal of the high-voltage distribution board with a copper busbar; the TMS high-voltage connector, PTC high-voltage connector, DC charging socket and the output insulation terminal of the high-voltage distribution board are connected with a high-voltage wiring harness; the low-voltage connector is connected to the BMS controller with a low-voltage communication wiring harness.

9. A power battery system for a pure electric truck according to claim 7, characterized in that: It also includes a manual maintenance switch, which is arranged on the surface of the battery compartment shell and in the middle of each parallel branch of the battery module.

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