Power battery assembly of pure electric tractor, chassis of pure electric tractor and vehicle

Abstract

The invention relates to a power battery assembly of a pure electric tractor, a chassis of the pure electric tractor and a vehicle. The middle battery module assembly is mounted in the cavity of the frame body; each side battery module assembly is mounted in the cavity of the frame body, the at least two side battery module assemblies are arranged on the two opposite sides of the middle battery module assembly, and the top surface of each side battery module assembly is higher than the top surface of the middle battery module assembly; and the upper cover is arranged on the middle battery module assembly and the at least two groups of side battery module assemblies in a covering manner, the upper cover is fixed on the frame body in a sealing manner, and the upper cover forms a frame placing cavity between the at least two groups of side battery module assemblies. By placing the middle battery module assembly and the at least two groups of side battery module assemblies in the frame body, the arrangement space of the power battery assembly can be saved.

Description

Technical Field

[0001] The present application relates to the field of vehicle traction chassis, and specifically to a power battery assembly of a pure electric traction vehicle, a pure electric traction vehicle chassis and a vehicle. Background Art

[0002] See also Figure 1 As shown in the figure, in the related art, the layout of pure electric tractors is usually arranged behind the cab through a power battery frame. Due to the limited layout space behind the cab, in order to meet the demand for long-range driving of pure electric tractors, the power battery frame is usually set at a certain height along the height direction of the vehicle to accommodate more power batteries. However, both the power battery and the power battery frame have a certain weight. When the height of the power battery frame is higher, the center of gravity is also higher, which affects the operational stability of the whole vehicle. Summary of the invention

[0003] The present application provides a power battery assembly, a pure electric tractor chassis and a vehicle for a pure electric tractor, which can solve the technical problem in the related art that both the power battery and the power battery frame have a certain weight, and when the height of the power battery frame is high, the center of gravity is also high, which affects the operational stability of the entire vehicle.

[0004] In a first aspect, an embodiment of the present application provides a power battery assembly for a pure electric tractor, comprising: a frame; a central battery module assembly, the central battery module assembly being installed in a cavity of the frame; at least two groups of side battery module assemblies, each group of the side battery module assemblies being installed in the cavity of the frame, and at least two groups of side battery module assemblies being arranged on opposite sides of the central battery module assembly, and a top surface of each group of the side battery module assemblies being higher than a top surface of the central battery module assembly; an upper cover, the upper cover being arranged on the central battery module assembly and at least two groups of the side battery module assemblies, and the upper cover being sealed and fixed to the frame, and the upper cover forming a frame placement cavity between the at least two groups of the side battery module assemblies.

[0005] In combination with the first aspect, in one embodiment, a plurality of groups of module support assemblies arranged at intervals are fixed to the inner side wall of the frame; the middle battery module assembly and at least two groups of side battery module assemblies each include a plurality of battery modules, and each of the battery modules in the middle battery module assembly and at least two groups of side battery module assemblies are arranged at intervals along the height direction of the frame, each of the battery modules is supported by a group of module support assemblies, and a plurality of the battery modules are connected by copper busbars.

[0006] In combination with the first aspect, in one embodiment, the frame has a threading plate, the threading plate is provided with a plurality of threading holes, and at least some of the threading holes are installed with plug-in seals; each of the battery modules is arranged at intervals from the threading plate, and a wiring port is installed on the front end face of each of the battery modules, and the front end face faces the threading plate.

[0007] In combination with the first aspect, in one embodiment, the frame further has a back plate, the back plate and the threading plate are arranged on opposite sides of the frame, the back plate and the threading plate are both provided with a through groove, and the through groove extends along the extension direction of the back plate; the back plate and the threading plate are both provided with a plurality of fixing holes on the side close to the opening of the frame, the fixing holes in the back plate and the threading plate are both connected with the corresponding through grooves, and the plurality of fixing holes are arranged at intervals along the extension direction of the threading plate; the through grooves of the back plate and the threading plate are both provided with a reinforcing plate, the reinforcing plate is provided with a threaded hole corresponding to the fixing hole, the reinforcing plate is fixed by a screw penetrated through part of the fixing holes and part of the threaded holes, and part of the fixing holes and part of the threaded holes corresponding to the above fixing holes are penetrated with long bolts, and the long bolts respectively pass through the back plate and the threading plate.

[0008] In combination with the first aspect, in one embodiment, each group of the module support components includes two fixing brackets, the two fixing brackets are arranged at an interval, and the fixing brackets are provided with wire passing holes.

[0009] In combination with the first aspect, in one embodiment, the upper cover includes a middle cover and end covers installed on opposite sides of the middle cover, the end cover sealing cover is arranged on the frame body near the side battery module assembly, and the middle cover sealing cover is arranged on the frame body near the middle battery module assembly, and the middle cover and the end covers on both sides of the middle cover together form the frame placement cavity.

[0010] In a second aspect, an embodiment of the present application provides a pure electric tractor chassis, which includes the above-mentioned power battery assembly, and the pure electric tractor chassis also includes: a frame, the power battery assembly is fixed to the frame, and part of the frame is accommodated in the frame placement cavity, and at least two groups of side battery module assemblies are arranged on opposite sides of the frame.

[0011] In combination with the second aspect, in one implementation, the pure electric traction vehicle chassis further includes a motor controller, the motor controller is mounted on the frame, and the motor controller is accommodated in the frame placement cavity.

[0012] In combination with the second aspect, in one embodiment, the pure electric traction vehicle chassis further includes: an all-in-one controller, which is mounted on the frame, and the all-in-one controller and the power battery assembly are spaced apart along the length direction of the frame, and the all-in-one controller is signal-connected to the power battery assembly; an electric drive axle, which is signal-connected to the all-in-one controller.

[0013] In a third aspect, an embodiment of the present application provides a vehicle, characterized in that it includes the above-mentioned power battery assembly.

[0014] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0015] By placing the middle battery module assembly and at least two groups of side battery module assemblies in the frame, the layout space of the power battery assembly can be saved, and the upper cover is formed between the at least two groups of side battery module assemblies to form a frame placement cavity, so that the frame can be arranged on the bottom surface of the frame, and part of the frame extends into the frame placement cavity. The power battery assembly can also install a part of the middle battery module assembly through the frame below the frame without affecting the placement of other objects above the frame to increase the power of the power battery assembly, thereby solving the technical problem in the related art that both the power battery and the power battery frame have a certain weight, and when the height of the power battery frame is high, the center of gravity is also high, which affects the operating stability of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of a three-dimensional structure in which a power battery frame is arranged behind a cab in the related art;

[0018] Figure 2 A schematic diagram of a three-dimensional structure of a power battery assembly provided in an embodiment of the present application installed on a vehicle frame;

[0019] Figure 3 A schematic diagram of a top view of a power battery assembly provided in an embodiment of the present application installed on a vehicle frame;

[0020] Figure 4 A schematic diagram of a three-dimensional structure in which a thermal management unit provided in an embodiment of the present application is installed in an accessory integrated module;

[0021] Figure 5 A schematic diagram of the three-dimensional structure of a frame provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a middle battery module assembly connected to a side battery module assembly provided in an embodiment of the present application.

[0023] In the figure:

[0024] 1. Power battery assembly; 11. Frame; 111. Module support assembly; 1111. Fixed bracket; 112. Threading plate; 1121. Threading hole; 1122. Waterway interface; 113. Back plate; 114. Threading groove; 115. Fixed hole; 12. Middle battery module assembly; 13. Side battery module assembly; 14. Frame placement cavity; 151. Middle cover; 152. End cover; 16. Battery module; 161. Copper busbar; 162. Water pipe; 18. Exhaust valve; 19. Battery fixing plate;

[0025] 21. Frame; 211. Front axle; 212. First longitudinal beam; 213. Second longitudinal beam; 23. Expansion water tank; 24. Electric drive axle; 241. Middle axle; 242. Rear axle; 25. Motor controller; 26. Battery management system; 27. Cooling system radiator;

[0026] 3. Cab;

[0027] 4. Accessory integration module; 41. Two-in-one steering air compressor; 42. Air reservoir; 43. Battery; 44. Bracket; 45. All-in-one controller; 46. Thermal management unit. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The embodiment of the present application provides a power battery assembly for a pure electric tractor, which can solve the technical problem in the related art that both the power battery and the power battery frame have a certain weight, and when the height of the power battery frame is high, the center of gravity is also high, which affects the operational stability of the entire vehicle.

[0030] See also Figure 2As shown, a power battery assembly 1 of a pure electric tractor provided in an embodiment of the present application may include: a frame 11; a middle battery module assembly 12, wherein the middle battery module assembly 12 is installed in the cavity of the frame 11; at least two groups of side battery module assemblies 13, each group of the side battery module assemblies 13 is installed in the cavity of the frame 11, and at least two groups of side battery module assemblies 13 are arranged on opposite sides of the middle battery module assembly 12, and the top surface of each group of the side battery module assemblies 13 is higher than the top surface of the middle battery module assembly 12; an upper cover, wherein the upper cover is arranged on the middle battery module assembly 12 and the at least two groups of the side battery module assemblies 13, and the upper cover is sealed and fixed to the frame 11, and a frame placement cavity 14 is formed between the upper cover and the at least two groups of the side battery module assemblies 13, and the power battery assembly 1 can be integrated by the middle battery module assembly 12 and the at least two groups of the side battery module assemblies 13, and a part of the frame 21 can extend into the frame placement cavity 14.

[0031] In the embodiment of the present application, the middle battery module assembly 12 and at least two groups of side battery module assemblies 13 are placed in the frame 11, so that the layout space of the power battery assembly 1 can be saved. After the power battery assembly 1 is integrated with the frame 11, the middle battery module assembly 12 and the side battery module assembly, the power battery assembly 1 can be placed under the frame 21 to lower the center of gravity of the power battery assembly 1 and enhance the driving stability of the commercial vehicle. The upper cover is formed between the at least two groups of side battery module assemblies 13 to form a frame placement cavity 14. When the battery assembly 1 is arranged on the bottom surface of the frame 21 through the frame 11, at least part of the frame 21 extends into the frame placement cavity 14. The power battery assembly 1 can also install a part of the middle battery module assembly 12 under the frame 21 through the frame 11 without affecting the placement of other objects on the frame 21, so as to increase the power of the power battery assembly 1, and thus increase the overall endurance of the commercial vehicle. In other words, even if the power battery assembly 1 is integrated in the frame 11 and placed on the bottom surface of the frame 21, the required endurance power can be achieved. Furthermore, after the middle battery module assembly 12 and at least two groups of side battery module assemblies are integrated, safety components such as BMS and exhaust valve 18 can be designed on the outside of the integrated battery to play a safety protection role, thus solving the technical problem in the related art that both the power battery and the power battery frame have a certain weight, and when the height of the power battery frame is high, the center of gravity is also high, which affects the operational stability of the whole vehicle.

[0032] In some optional embodiments, see Figure 6As shown, the inner side wall of the frame 11 is fixed with multiple groups of module support assemblies 111 arranged at intervals; the middle battery module assembly 12 and at least two groups of side battery module assemblies 13 each include a plurality of battery modules 16, and each of the battery modules 16 in the middle battery module assembly 12 and at least two groups of side battery module assemblies 13 is arranged at intervals along the height direction of the frame 11, and each of the battery modules 16 is supported by a group of module support assemblies 111. In the embodiment of the present application, before each battery module 16 is placed in the frame 11, multiple groups of module support assemblies are first fixed in the frame 11, so that each battery module 16 can be arranged at intervals from each other after being placed in the module support assemblies to meet the requirements of each battery module The deformation safety gap between the groups 16 can therefore set the distance between each group of module support assemblies before installing the module support assembly, and multiple battery modules 16 are connected by copper bars 161. It should be understood that when each battery module 16 is installed in the frame, the positive and negative electrodes of each battery module 16 should also be connected in series to enable each battery module 16 to be integrated. In the embodiment of the present application, the high voltage between each battery module 16 is connected by copper bars, which can save costs and save the layout space of the battery module 16 compared to the high-voltage line connection, and the weight can also be reduced accordingly. Preferably, the outer side of each copper bar 161 can be waterproofed, and the low voltage between each battery module 16 can still be connected through the line. In some other embodiments, each group of module support assemblies 111 can be first fixed on the battery module 16, and then assembled with the battery module 16 into the frame 11. At this time, a battery fixing plate 19 can be fixed in the frame 11, and each module support assembly 111 is bolted to the battery fixing plate 19, which can enhance the convenience of connection.

[0033] Preferably, the reason for the formation of the frame placement cavity 14 in the embodiment of the present application may be that more layers of battery modules 16 are arranged at the side battery module assembly 13 than at the middle battery module assembly 12. When the installation bottom surfaces of the side battery module assembly 13 and the middle battery module assembly 12 are on the same horizontal plane, the top surface of the middle battery module assembly 12 and the top surfaces of the side battery module assemblies 13 located on both sides thereof jointly form a groove. Then, when the upper cover is set at the top surfaces at different heights, the frame placement cavity 14 is formed. In some other embodiments, a battery module 16 may also be integrated in a non-frame placement area of ​​the frame placement cavity 14, and the battery module 16 in this area may also be integrated in the frame 11. Specifically, the middle battery module assembly 12 may be provided with multiple columns of battery modules 16 along the transverse direction of the vehicle, and each column of battery modules 16 includes at least two battery modules 16. For example, three columns of battery modules 16 are provided in the middle battery module assembly 12. At this time, two columns of battery modules 16 are provided with two battery modules 16 along the height direction of the vehicle, and the other column is provided with three or more battery modules 16. A column of modules with three or more battery modules 16 may be located between two columns of modules with two battery modules 16, so that a column of modules with three or more battery modules 16 and the side battery module assembly 13 form a frame placement cavity 14. At this time, the area of ​​the frame placement cavity 14 may be smaller, with only the longitudinal beam of the frame placed therein, but the overall power of the power battery assembly may be increased, thereby increasing the vehicle's endurance. In some optional embodiments, see Figure 5 As shown, the frame 11 has a threading plate 112, and the threading plate 112 is provided with a plurality of threading holes 1121, and at least some of the threading holes 1121 are installed with plug-in seals; each of the battery modules 16 is arranged at intervals from the threading plate 112, and the front end face of each of the battery modules 16 is installed with a wiring port, and the front end face faces the threading plate 112, and the wiring port of the front end face of each battery module 16 can be connected to a low-voltage wiring harness and a copper busbar. In addition, at the front end A water pipe 162 can also be fixed on the surface, and the high-voltage inlet and outlet of each battery module 16 can be connected through each copper bus 161; the low-voltage inlet and outlet between each battery module 16 can be connected through each low-voltage wiring harness, and the low-voltage inlet and outlet of each battery module 16 can be integrated through the low-voltage wiring harness to form a total low-voltage wiring harness, and the low-voltage wiring harness can be used to transmit the cell voltage, temperature data, etc. in the module sampling board; the cooling water inlets between each battery module 16 can be connected through each water pipe 162.

[0034] Preferably, the threading holes 1121 of the threading plate 112 may include a fixed water channel interface 1122, a fixed high-voltage connector interface and a fixed low-voltage connector interface, wherein the fixed water channel interface 1122 is connected to the water pipe 162 in the package, the fixed high-voltage connector interface is connected to the high-voltage copper bus, and the low-voltage connector interface is connected to the total low-voltage wiring harness. By arranging the threading holes 1121 on the threading plate 112, it is convenient to connect the power battery assembly 1 with other structures of the commercial vehicle. Furthermore, in order to enhance the sealing performance of the frame 11, plug-in seals are arranged at some of the threading holes 1121, and the side of the plug-in seal close to the cavity of the frame 11 can be connected to part of the lines of each battery module 16. When other structures of the commercial vehicle need to be connected to the power battery assembly 1, the lines of the power battery assembly 1 can be indirectly connected through the plug-in seals. Then, the battery module 16 and the threading plate 112 are arranged at intervals to facilitate the routing of the front face.

[0035] In some optional embodiments, the frame 11 further has a back plate 113, the back plate 113 and the threading plate 112 are arranged on opposite sides of the frame 11, and the back plate 113 and the threading plate 112 are both provided with a through slot 114, and the through slot 114 extends along the extension direction of the back plate 113; the back plate 113 and the threading plate 112 are both provided with a plurality of fixing holes 115 on one side close to the opening of the frame 11, and the fixing holes 115 in the back plate 113 and the threading plate 112 are connected with the corresponding through slots 114, and the plurality of fixing holes 115 are arranged at intervals along the extension direction of the threading plate 112; the through slots 114 of the back plate 113 and the threading plate 112 are both provided with a reinforcing plate, and the reinforcing plate is provided with threaded holes corresponding to the fixing holes 115, and the reinforcing plate is fixed by screws penetrated through some of the fixing holes 115 and some of the threaded holes. And some of the fixing holes 115 and some of the threaded holes corresponding to the above-mentioned fixing holes 115 are penetrated by long bolts, and the long bolts pass through the back plate 113 and the threading plate 112 respectively. It should be understood that the structures of the through grooves 114, the fixing holes 115 and the reinforcing plates can be set the same on the back plate 113 and the threading plate 112. Therefore, the through grooves 114 of the back plate 113 are taken as an example here. The through grooves 114 can penetrate from one end of the back plate 113 to the other end. In the embodiment of the present application, two through grooves 114 spaced apart from each other are opened on two sides of the back plate 113, so that the back plate 113 can have stronger strength at the places where the through grooves 114 are not opened. By opening the fixing holes 115, the power battery assembly 1 can be fixed to the frame 21 by long bolts. By inserting the reinforcing plates in the through grooves 114, the local stress at each long bolt can be reduced, so that after the power battery assembly 1 is back-hoisted to the frame 21, the overall force is more uniform. The nut of the long bolt can be arranged on the side of the reinforcing plate away from the fixing hole 115. If the frame 11 is stripped, only the reinforcing plate needs to be replaced, which enhances the convenience of maintenance. Furthermore, the reinforcing plate can be made of high-strength steel to enhance the connection strength between the power battery assembly 1 and the frame 21.

[0036] Preferably, the power battery assembly 1 can use the MTB solution and adopt mass-produced standard modules. At this time, the connection port and the water outlet of the battery module 16 are both set toward the threading plate 112 of the frame 11, and each battery module 16 fits the back plate 113 of the frame 11 as much as possible, so that the battery module 16 is kept at a certain distance from the threading plate 112, leaving space for disassembly and assembly operations.

[0037] In some optional embodiments, each group of the module support assembly 111 includes two fixed brackets 1111, the two fixed brackets 1111 are arranged at intervals, and the fixed brackets 1111 are provided with wire holes, that is, the two fixed brackets 1111 of each group of module support assembly 111 can be arranged at intervals in a direction perpendicular to the surface of the threading plate 112, one of the fixed brackets 1111 of each group of module support assembly 111 is fixed to the threading plate 112, and the other fixed bracket 1111 is fixed to the back plate 113. This arrangement can save the material use of the module support assembly 111 and reduce the weight of the power battery assembly 1. Further, the wire holes can be opened only on the fixed brackets 1111 fixed on the threading plate 112 to save operation steps. At this time, the lines of each battery module 16 are passed through the wire holes to increase the overall neatness and reduce the number of bending times of the copper busbar. Preferably, wire holes can be opened on all the fixed brackets 1111 to further reduce the weight of the power battery assembly 1.

[0038] In some optional embodiments, the upper cover includes a middle cover 151 and end covers 152 installed on opposite sides of the middle cover 151. The middle cover 151 and the end covers 152 can be an integrally formed structure. The sealing cover of the end cover 152 is arranged on the frame 11 near the side battery module assembly 13, and the sealing cover of the middle cover 151 is arranged on the frame 11 near the middle battery module assembly 12. The middle cover 151 and the end covers 152 on both sides of the middle cover 151 jointly form the frame placement cavity 14. Sealing gaskets can be installed between the middle cover 151 and the frame 11 and between the end covers 152 and the frame 11. The sealing gaskets can enhance the sealing of the connection between the middle cover 151 and the end covers 152 and the frame 11. In the embodiment of the present application, two groups of side battery module assemblies 13 are provided, and the two groups of side battery module assemblies 13 are provided on opposite sides of the middle battery module assembly 12. At this time, the module support assembly 111 at the side battery module assembly 13 installed in the frame 11 is provided with three layers, and the module support assembly 111 at the middle battery module assembly 12 is provided with two layers. In order to reduce the volume of the power battery assembly 1 and reduce the weight of the power battery assembly 1 as much as possible, the third layer, that is, the top layer, of the module support assembly 111 at the side battery module assembly 13 is provided at the frame 11 near its opening, and the battery module 16 installed on this layer protrudes out of the frame 11. Then, this place can be sealed by the end cover 152, which can reduce the manufacturing difficulty of the frame 11. At this time, the top surface of the end cover 152 is higher than the top surface of the middle cover 151, and the frame 21 can also be located on the top surface of the middle cover 151.

[0039] The present application also provides a pure electric tractor chassis, which may include the above-mentioned power battery assembly 1, and the pure electric tractor chassis further includes: a frame 21, the power battery assembly 1 is fixed to the frame 21, and a portion of the frame 21 is accommodated in the frame placement cavity 14, and at least two groups of the side battery module assemblies 13 are arranged on opposite sides of the frame 21, see Figure 3 As shown, the vehicle frame 21 may include a first longitudinal beam 212 and a second longitudinal beam 213 arranged in parallel with the first longitudinal beam 212, and a plurality of supporting cross beams may be fixed between the two longitudinal beams. Preferably, the power battery assembly 1 may be connected to the first longitudinal beam 212 and the second longitudinal beam 213 through a bracket, and the top surfaces of the first longitudinal beam 212 and the second longitudinal beam 213 are both higher than the top surface of the power battery assembly 1, so as to reduce the interference of the power battery assembly 1 with objects placed on the first longitudinal beam 212 and the second longitudinal beam 213.

[0040] In some optional embodiments, the pure electric traction vehicle chassis also includes a motor controller 25, which is installed on the frame 21, and the motor controller 25 is accommodated in the frame placement cavity 14, that is, at least part of the first longitudinal beam 212 and the second longitudinal beam 213 can be accommodated in the frame placement cavity 14, and is spaced apart from the middle cover 151, then there is a certain gap between the top surface of the middle cover 151 and the bottom surface of the first longitudinal beam 212 and the second longitudinal beam 213, and the motor controller 25 can be installed in the gap, so as to more reasonably utilize the space between the first longitudinal beam 212 and the second longitudinal beam 213. It should be understood that the motor controller 25 is also spaced apart from the middle cover 151.

[0041] In some optional embodiments, the pure electric tractor chassis further includes: an all-in-one controller 45, the all-in-one controller 45 is installed on the frame 21, and the all-in-one controller 45 and the power battery assembly 1 are spaced apart along the length direction of the frame 21, the all-in-one controller 45 is signal-connected to the power battery assembly 1, the all-in-one controller 45 can be installed between the cab 3 and the frame 21, and the high-voltage line of the power battery can be connected to the all-in-one controller 45 through a line between the all-in-one controller 45 and the power battery, and the all-in-one controller 45 is then connected to the motor controller 25. Preferably, a BMS battery management system 26 can also be installed at the location of the frame 21 near the all-in-one controller 45, and the battery management system 26 is connected to the low-voltage line of the power battery assembly 1 through a line. In the embodiment of the present application, two power battery assemblies 1 are provided, and the two power battery assemblies 1 are fixed to the vehicle frame 21 at intervals, so that each power battery assembly 1 is signal-connected to the all-in-one controller 45 and to the battery management system 26. In order to facilitate shorter connection lines between each power battery assembly 1 and the all-in-one controller 45 and the battery management system 26, the threading plates 112 of the two power battery assemblies 1 are both arranged on the opposite side of the two power battery assemblies 1. The electric drive axle 24 is connected to the all-in-one controller 45 by signal. The electric drive axle 24 in the embodiment of the present application may include a middle axle 241 and a rear axle 242. Both the middle axle 241 and the rear axle 242 may be located behind the power battery assembly 1 and below the frame 21. The middle axle 241 and the rear axle 242 are connected to the frame 21 through a suspension. Both the middle axle 241 and the rear axle 242 are connected to the all-in-one controller 45 by signal. The motor controller 25 is arranged near the middle axle 241 and the rear axle 242. The adoption of the electric drive axle 24 in the embodiment of the present application shortens the power transmission path, improves economy, and can reduce the space occupied by the powertrain on the frame 21. That is, the electric drive axle 24 can be used to replace the original powertrain, powertrain suspension, transmission shaft and drive axle, reduce the number of assembly materials, and improve the efficiency of the general assembly line.

[0042] Preferably, see Figure 4As shown, a cooling system radiator 27 and an accessory integrated module 4 may be arranged below the cab 3 and above the frame 21. The accessory integrated module 4 may include a bracket 44 and a plurality of high-voltage accessories mounted on the bracket 44. The high-voltage accessories may include a thermal management unit 46, an all-in-one controller 45, a low-voltage lithium battery, a steering air compressor two-in-one 41, and an air storage cylinder 42. The cooling system may be used for cooling the entire vehicle, that is, it may be an integrated cooling system, specifically, it may be used for cooling a motor, a battery, or an all-in-one. The cooling system can be divided into multiple different water channels, which can exchange heat with the inside of the unit and achieve energy saving, such as using the heat of the motor to heat the cab. The thermal management unit 46, the all-in-one controller 45, and the low-voltage lithium battery are arranged in sequence above the frame 21 along the front and rear direction of the frame 21. Since the low-voltage lithium battery is relatively small, it is arranged against a side longitudinal beam of the frame 21; the two-in-one steering air compressor 41 is located directly below the thermal management unit 46, that is, between the first longitudinal beam 212 and the second longitudinal beam 213; the air storage cylinder 42 is located directly below the all-in-one controller 45, and behind the two-in-one steering air compressor 41, and between the first longitudinal beam 212 and the second longitudinal beam 213.

[0043] Furthermore, in the embodiment of the present application, the accessory integrated module 4 is arranged below the cab 3, and the electric drive axle 24 is fixed below the rear of the frame 21, so that the bottom of the frame 21 has enough space to place the power battery. In addition, the motor gearbox plus transmission shaft in the related art is modified into an electric drive axle in the embodiment of the present application, and the air reservoir 42, the thermal management unit 46, the all-in-one controller 45, the battery 43, the steering air compressor two-in-one 41, and the steering pump are installed below the cab using an integrated module, freeing up the layout space of the power battery assembly behind the cab, thereby improving the space utilization of the entire vehicle. The frame 21 can also include a front axle 211, which is connected to the first longitudinal beam 212 and the second longitudinal beam 213 respectively, and the accessory integrated module 4 can be installed at the top of the front axle 211.

[0044] It should be understood that compared with the new energy electric vehicle battery in the related art, due to the limited layout space, it is installed behind the cab in the form of a power battery frame. The center of gravity and layout center of the battery are both higher, and the battery's own weight accounts for a large proportion of the weight of the whole vehicle. The overall power is small and the battery life is low. The embodiment of the present application provides a method for realizing a large power of an MTB battery pack. By integrating the power battery assembly, the overall volume and weight of the power battery assembly can be greatly reduced compared to the new energy electric vehicle battery in the related art. At this time, the middle part of the frame is placed in the frame placement cavity 14. The fixed bracket, frame, crossbeam and power battery assembly adopt an integrated design to match the frame with the power battery assembly, which can not only lower the layout center of gravity of the power battery assembly, but also make the maximum use of the layout space of the commercial vehicle. That is, the power battery assembly 1 in the embodiment of the present application adopts the MTB three-layer form and the whole package bottom-mounted form. Compared with the traditional side-mounted two-layer structure, it can accommodate more electricity, increase the overall power of the power battery assembly as much as possible, meet the full-load long-range traction power requirements, improve the endurance, and make better use of the space on both sides, middle and bottom of the frame.

[0045] The embodiment of the present application also provides a vehicle, which may include a power battery assembly 1 as described above. In the embodiment of the present application, the integrated MTB power battery assembly 1 is fixed to the frame 21 by a bracket, which can improve the mass energy density and volume energy density compared with the traditional battery frame form. The battery module 16 and the power battery assembly 1 are designed in an integrated manner, and can support each other in structure. And through the all-in-one controller 45, the PDU (high-voltage distribution unit) and the BDU (battery pack disconnecting unit) can be integrated, and the MSD (manual maintenance switch) can be integrated into the power battery assembly 1, which can save the layout space of the vehicle and save costs. In the embodiment of the present application, the power battery assembly 1 is fixed to the bottom of the frame 21, there is no back battery frame, and there is no high-altitude operation during the installation stage. The height of the expansion water tank 23 can be guaranteed to be below 1.4 meters, and the coolant filling is convenient; the cooling pipeline is greatly shortened and occupies less space; and after the power battery assembly 1 is placed under the frame 21, the center of the whole vehicle is lowered by more than 0.5m, the operational stability of the whole vehicle is greatly improved, the average vehicle speed is increased, and the transportation efficiency is improved. Furthermore, the chassis of the pure electric tractor can be common to almost all models, and adopts a modular design. When different models use different wheelbases and different power configurations, it is sufficient to replace the power battery assembly 1, and the rest of the parts can be completely common. In addition, the upper loading space of the vehicle is larger, and without the rear battery frame, it can accommodate a larger cargo box, transport more goods at a time, and bring more economic benefits to customers.

[0046] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0047] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0048] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A power battery assembly for a pure electric traction vehicle, characterized in that: It includes: Frame (11); A middle battery module assembly (12), wherein the middle battery module assembly (12) is installed in the cavity of the frame (11); At least two groups of side battery module assemblies (13), each group of the side battery module assemblies (13) is installed in the cavity of the frame (11), and at least two groups of the side battery module assemblies (13) are arranged on opposite sides of the middle battery module assembly (12), and the top surface of each group of the side battery module assemblies (13) is higher than the top surface of the middle battery module assembly (12); An upper cover is provided on the middle battery module assembly (12) and at least two groups of the side battery module assemblies (13), and the upper cover is sealed and fixed to the frame (11), and the upper cover forms a vehicle frame placement cavity (14) between the at least two groups of the side battery module assemblies (13).

2. The power battery assembly of a pure electric tractor as claimed in claim 1, characterized in that: A plurality of groups of module support components (111) arranged at intervals are fixed to the inner side wall of the frame (11); The central battery module assembly (12) and at least two groups of side battery module assemblies (13) each comprise a plurality of battery modules (16); each of the battery modules (16) in the central battery module assembly (12) and at least two groups of side battery module assemblies (13) are arranged at intervals along the height direction of the frame (11); each of the battery modules (16) is supported by a group of module support assemblies (111), and the plurality of battery modules (16) are connected via a copper busbar (161).

3. The power battery assembly of a pure electric tractor as claimed in claim 2, characterized in that: The frame (11) has a threading plate (112), the threading plate (112) is provided with a plurality of threading holes (1121), and at least some of the threading holes (1121) are installed with plug-in seals; Each of the battery modules (16) is arranged at intervals from the threading plate (112), and a wiring port is installed on the front end surface of each of the battery modules (16), and the front end surface faces the threading plate (112).

4. The power battery assembly of a pure electric tractor as claimed in claim 3, characterized in that: The frame (11) further comprises a back plate (113), wherein the back plate (113) and the threading plate (112) are arranged on opposite sides of the frame (11), and the back plate (113) and the threading plate (112) are both provided with a through groove (114), and the through groove (114) extends along the extension direction of the back plate (113); The back plate (113) and the threading plate (112) are both provided with a plurality of fixing holes (115) on one side close to the open side of the frame (11); the fixing holes (115) in the back plate (113) and the threading plate (112) are both connected to the corresponding threading grooves (114); and the plurality of fixing holes (115) are arranged at intervals along the extension direction of the threading plate (112); The through grooves (114) of the back plate (113) and the threading plate (112) are both provided with reinforcing plates, the reinforcing plates are provided with threaded holes corresponding to the fixing holes (115), the reinforcing plates are fixed by screws that are provided through part of the fixing holes (115) and part of the threaded holes, and long bolts are provided through part of the fixing holes (115) and part of the threaded holes corresponding to the fixing holes (115), and the long bolts are respectively passed through the back plate (113) and the threading plate (112).

5. The power battery assembly of a pure electric tractor as claimed in claim 2, characterized in that: Each group of the module support components (111) comprises two fixing brackets (1111), the two fixing brackets (1111) are arranged at an interval, and the fixing brackets (1111) are provided with wire holes.

6. The power battery assembly of a pure electric tractor as claimed in claim 1, characterized in that: The upper cover comprises a middle cover (151) and end covers (152) installed on opposite sides of the middle cover (151); the sealing cover of the end cover (152) is arranged on the frame (11) close to the side battery module assembly (13); and the sealing cover of the middle cover (151) is arranged on the frame (11) close to the middle battery module assembly (12); the middle cover (151) and the end covers (152) on both sides of the middle cover (151) together enclose the vehicle frame placement cavity (14).

7. A pure electric traction vehicle chassis, characterized in that: It comprises the power battery assembly according to any one of claims 1 to 6, and the pure electric tractor chassis further comprises: A vehicle frame (21), the power battery assembly is fixed to the vehicle frame (21), a portion of the vehicle frame (21) is accommodated in the vehicle frame placement cavity (14), and at least two groups of side battery module assemblies (13) are arranged on opposite sides of the vehicle frame (21).

8. The pure electric tractor chassis according to claim 7, characterized in that: The pure electric traction vehicle chassis further comprises a motor controller (25), wherein the motor controller (25) is mounted on the vehicle frame (21), and the motor controller (25) is accommodated in the vehicle frame placement cavity (14).

9. The pure electric tractor chassis according to claim 7, characterized in that: The pure electric tractor chassis also includes: an all-in-one controller (45), the all-in-one controller (45) being mounted on the vehicle frame (21), the all-in-one controller (45) and the power battery assembly (1) being spaced apart along the length direction of the vehicle frame (21), the all-in-one controller (45) being signal-connected to the power battery assembly (1); An electric drive bridge (24), wherein the electric drive bridge (24) is signal-connected to the all-in-one controller (45).

10. A vehicle, characterized in that: It comprises the power battery assembly as claimed in any one of claims 1 to 6.

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