Steel-aluminum hybrid heavy truck frame and new energy truck

Abstract

A steel-aluminum hybrid heavy truck frame and a new energy truck belong to the technical field of vehicle engineering, the steel-aluminum hybrid heavy truck frame comprises a front longitudinal beam, a battery frame and a rear longitudinal beam which are connected in sequence, the front side face and the rear side face of the battery frame are respectively and fixedly connected with two oppositely-arranged first connecting pieces, and the front longitudinal beam and the rear longitudinal beam correspond to the adjacent first connecting pieces one to one. The inner sides and the outer sides of the front longitudinal beams and the rear longitudinal beams are fixedly connected with the corresponding first connecting pieces through second connecting pieces; two built-in longitudinal frames are fixedly arranged in the battery frame, and the built-in longitudinal frames, the front longitudinal beam and the rear longitudinal beam are located in the same vertical plane. The two built-in longitudinal frames are matched with the coaxial alignment arrangement of the front longitudinal beam and the rear longitudinal beam, the deformation resistance of the battery frame is greatly improved, meanwhile, the front longitudinal beam and the rear longitudinal beam are fixed in a multi-dimensional mode through the second connecting pieces and the first connecting pieces on the inner side and the outer side, the longitudinal force transmission path is more direct and balanced, the bearing strength of the connecting part is remarkably improved, and the service life of the battery frame is prolonged. And the mounting stability of the battery pack assembly and the driving safety of the whole vehicle are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle engineering, in particular to a steel-aluminum hybrid heavy truck frame and a new energy truck. BACKGROUND

[0002] The new energy truck follows the fuel truck frame to hang the battery frame and the battery to the two sides of the frame. Because the battery is heavy, the stress on the new energy truck is completely different from that on the traditional fuel truck. The front side hanging battery frame of the new energy truck is prone to problems such as large deformation of the side hanging position frame longitudinal beam, heavy battery frame, limited battery arrangement space, etc.

[0003] To solve the above problems, an integrated frame (such as CN118907231B) has appeared, which adopts a three-section structure in the longitudinal direction, including a front longitudinal beam, a middle longitudinal beam, a battery frame, and a rear longitudinal beam. The battery frame is placed in the middle section of the longitudinal beam, and the battery frame is used to install battery pack assemblies. The three-section structure effectively enhances the structural support of the battery frame and improves the structural strength of the entire frame, providing stronger support for the vehicle and improving the stability and balance of the overall vehicle structure.

[0004] The existing integrated frame has only one longitudinal beam at the middle position of the middle battery frame, and no cross beam structure. When the battery frame is long, the battery frame is prone to torsional deformation under torsional working conditions, which can damage the battery. In addition, the longitudinal beam transmits force to the battery frame through the side plate of the battery frame. The insufficient strength of the side plate can cause serious deformation, which can further cause damage to the battery connection position, poor installation stability, and poor safety. SUMMARY

[0005] To solve the technical problem of the existing integrated frame in the background art, in which the middle battery frame has only one longitudinal beam at the middle position and no cross beam structure, and when the battery frame is long, the battery frame is prone to torsional deformation under torsional working conditions, which can damage the battery, the present application provides a steel-aluminum hybrid heavy truck frame and a new energy truck.

[0006] The technical scheme of the present application is as follows: The application provides a steel-aluminum mixed heavy truck frame, which comprises a front longitudinal beam, a battery frame and a rear longitudinal beam connected in sequence, two oppositely arranged first connecting pieces are fixedly connected to the front and rear sides of the battery frame, the front longitudinal beam and the rear longitudinal beam correspond to the adjacent first connecting pieces one by one, and the inner and outer sides of the front longitudinal beam and the rear longitudinal beam are fixedly connected to the corresponding first connecting pieces through second connecting pieces; two built-in longitudinal frames are fixedly arranged in the battery frame, and the built-in longitudinal frames are in the same vertical plane as the front longitudinal beam and the rear longitudinal beam. The two built-in longitudinal frames can form a double longitudinal support structure in the length direction of the battery frame, cooperate with the coaxial alignment arrangement of the front longitudinal beam and the rear longitudinal beam, greatly improve the anti-deformation capacity of the battery frame under a torsion working condition, ensure the structural integrity of the battery pack assembly under a complex stress scenario, and realize multi-dimensional fixing of the front longitudinal beam and the rear longitudinal beam through the second connecting pieces and the first connecting pieces on the inner and outer sides, so that the longitudinal force transmission path is more direct and balanced, the force is prevented from being concentrated on a single side plate structure during force transmission, the bearing strength of the connecting part is significantly improved, and the installation stability of the battery pack assembly and the driving safety of the whole vehicle are improved.

[0007] Preferably, the two first connecting pieces on the same side are fixedly connected through a first cross beam, the inner sides of the front longitudinal beam and the rear longitudinal beam are fixedly connected to the first cross beam through the second connecting pieces, the first cross beam can form a rigid connection whole of the two first connecting pieces on the same side, further optimizes the force transmission path between the front longitudinal beam, the rear longitudinal beam and the battery frame, makes the longitudinal force and the transverse force can be dispersed and transmitted through the first cross beam, improves the structural synergy of the whole frame, provides additional support fixing points for the inner sides of the front longitudinal beam and the rear longitudinal beam, enhances the shear resistance and structural stability of the connecting part, and further guarantees the structural rigidity of the battery frame under complex working conditions.

[0008] Preferably, the battery frame comprises two oppositely arranged first side frames, the two first side frames are fixedly connected through a second side frame between the two ends of the two first side frames, two built-in longitudinal frames are fixedly arranged between the two first side frames, the built-in longitudinal frames are parallel to the second side frame, a plurality of battery connecting supports are fixedly connected to the side surfaces of the second side frame and the built-in longitudinal frames, the battery connecting supports are vertically spaced and arranged, and the battery connecting supports extend along the length direction of the frame. The vertically spaced and arranged battery connecting supports extending along the length direction of the frame can provide a multi-point and large-area support fixing structure for the battery pack assembly, ensure the firmness of the connection between the battery pack assembly and the battery frame, and meanwhile, the parallel arrangement of the second side frame and the built-in longitudinal frames forms a regular support grid in the battery frame, further improves the structural stability and anti-deformation capacity of the battery frame, and provides a more stable installation environment for the battery pack assembly.

[0009] Preferably, the first side frame comprises a plurality of first horizontal pipe beams arranged vertically, the first horizontal pipe beams are fixedly connected through first vertical pipe beams, a plurality of first inclined pipe beams are fixedly arranged between adjacent first horizontal pipe beams, and a plurality of second connecting holes are symmetrically arranged on both sides of the middle position of the first horizontal pipe beam. The truss structure formed by the first horizontal pipe beam, the first vertical pipe beam and the first inclined pipe beam can optimize the material distribution while ensuring the structural strength of the first side frame, and can improve the bending resistance and torsion resistance of the first side frame. The symmetrically arranged second connecting holes can make the connection between the first side frame and the first connecting piece more balanced, avoid deformation or damage of the connection part caused by local stress concentration, and further enhance the reliability of the connection between the battery frame and the front and rear longitudinal beams.

[0010] Preferably, the first connecting piece comprises a plurality of connecting surfaces arranged vertically, the connecting surfaces are vertical surfaces, a supporting plate part is fixedly arranged below each connecting surface, the plate surface of the supporting plate part is perpendicular to the connecting surface, a plurality of first connecting holes are arranged on the connecting surface, and the first connecting holes are connected with the second connecting holes through bolts. The vertically arranged connecting surfaces can be precisely connected with the multi-layer structure of the first side frame, the bolt connection mode ensures the detachability and firmness of the connection part, the supporting plate part can provide vertical support for the first side frame and share the stress load of the connecting surface, thereby avoiding the connection part from bearing all the weight and external force only through the bolts, and improving the carrying capacity and service life of the connection structure.

[0011] Preferably, the number of the connecting surfaces and the supporting plate parts is the same as and corresponds to the number of the first horizontal pipe beams, the supporting plate parts are used to support the first horizontal pipe beams, and the one-to-one correspondence between the connecting surfaces and the supporting plate parts can realize the full and close connection between the first connecting piece and the first side frame, so that each first horizontal pipe beam can obtain independent vertical support and lateral fixation, ensure the uniformity of force transmission, avoid deformation of local structure caused by uneven stress, and further improve the stability and structural rigidity of the connection between the battery frame and the first connecting piece.

[0012] Preferably, the first side frame is a steel frame structure, the second side frame and the built-in longitudinal frame are aluminum alloy frame structures, and an aluminum connecting pad plate is arranged between the first side frame and the second side frame and the built-in longitudinal frame. The aluminum connecting pad plate is vertically arranged. The first side frame of the steel frame structure can provide excellent structural strength and anti-deformation capability, meet the carrying requirements of the key stress part of the battery frame, the second side frame and the built-in longitudinal frame of the aluminum alloy frame structure can effectively reduce the overall weight of the vehicle frame and realize lightweight design, and the aluminum connecting pad plate can optimize the connection compatibility between the steel and aluminum materials, reduce the risk of electrochemical corrosion caused by contact between different materials, and ensure the structural stability and force transmission efficiency of the connection part.

[0013] Preferably, the overall thickness of the battery frame is greater than that of the front longitudinal beam and the rear longitudinal beam, which is convenient for installation of a large-capacity battery, realizes lightweight design of the frame, and improves the power at the same time.

[0014] Preferably, the front and rear longitudinal beams are made of aluminum alloy, which can reduce the overall weight of the frame while ensuring the structural strength of the front and rear longitudinal beams, thereby improving the vehicle's power performance and range. At the same time, aluminum alloy has excellent corrosion resistance, which can extend the service life of the front and rear longitudinal beams and reduce the maintenance cost of the frame. Combined with the steel-aluminum hybrid battery frame structure, an optimized balance between vehicle lightweighting and structural strength is achieved.

[0015] A new energy truck includes the aforementioned steel-aluminum hybrid heavy truck frame. Through an integrated design and the selection of aluminum alloy materials in multiple locations, the weight of the frame is significantly reduced. The first connector provides both support and fixation for the battery frame, reducing the stress on the connection points of the battery frame.

[0016] As can be seen from the above technical solutions, the advantages of the present invention are: 1. The two built-in longitudinal frames can form a double longitudinal support structure along the length of the battery frame. Combined with the coaxial alignment of the front and rear longitudinal beams, this significantly improves the battery frame's resistance to deformation under torsional conditions, ensuring the structural integrity of the battery pack assembly under complex stress scenarios. At the same time, the front and rear longitudinal beams are fixed in multiple dimensions to the first connecting piece through the second connecting piece on the inner and outer sides, making the longitudinal force transmission path more direct and balanced. This avoids the force being concentrated on a single side panel structure during transmission, significantly enhancing the load-bearing strength of the connection parts and improving the installation stability of the battery pack assembly and the overall vehicle driving safety.

[0017] 2. The first connector includes several connecting surfaces spaced vertically. Each connecting surface is fixedly provided with a support plate below it. The one-to-one correspondence between the connecting surfaces and the support plate enables the full fit and docking between the first connector and the first side frame, so that each first horizontal tube beam can obtain independent vertical support and lateral fixation, ensuring the uniformity of force transmission, avoiding deformation of local structures due to uneven force, and further improving the stability and structural rigidity of the connection between the battery frame and the first connector. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a steel-aluminum hybrid heavy truck frame according to one or more embodiments of the present invention. Figure 2 This is a schematic diagram of the structure of the first connector according to one or more embodiments of the present invention; Figure 3 This is a schematic diagram of the battery frame according to one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of the first side frame according to one or more embodiments of the present invention; Figure 5 This is a schematic diagram of the structure of the second side frame according to one or more embodiments of the present invention; The components represented by the various reference numerals in the diagram are: 1. Front longitudinal beam; 2. First crossbeam; 3. First connector; 31. First connecting surface; 32. First support plate; 33. Second connecting surface; 34. Second support plate; 35. Third connecting surface; 36. Third support plate; 37. First connecting hole; 4. Second connector; 5. Rear longitudinal beam; 6. Second crossbeam; 7. Battery frame; 71. First side frame; 711. First horizontal tube beam; 712. First vertical tube beam; 713. First diagonal tube beam; 72. Second side frame; 721. Second horizontal tube beam; 722. Second vertical tube beam; 723. Second diagonal tube beam; 73. Internal longitudinal frame; 8. Connecting pad; 9. Battery connecting bracket; 10. Second connecting hole. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Example 1 In a typical embodiment of the present invention, such as Figures 1-5As shown, a steel-aluminum hybrid heavy truck frame is proposed, including: a front longitudinal beam 1, a first crossbeam 2, a first connecting member 3, a second connecting member 4, a rear longitudinal beam 5, and a battery frame 7. The battery frame 7 is located between the front longitudinal beam 1 and the rear longitudinal beam 5. Both the front and rear sides of the battery frame 7 are fixedly connected to the adjacent front longitudinal beam 1 and rear longitudinal beam 5 through the first crossbeam 2, the first connecting member 3, and the second connecting member 4. Specifically, the front side of the battery frame 7 is fixedly connected to two first connecting members 3 by bolts. The two first connecting members 3 are fixedly connected to each other by the first crossbeam 2. There are two front longitudinal beams 1, and the two front longitudinal beams 1 correspond one-to-one with the two first connecting members 3 on the front side of the battery frame 7. The outer side of the front longitudinal beam 1 is connected by the first crossbeam 2. The second connecting piece 4 is directly fixedly connected to the first connecting piece 3. The inner side of the front longitudinal beam 1 is fixedly connected to the first connecting piece 3 and the first cross beam 2 through the second connecting piece 4. Similarly, the rear side of the battery frame 7 is fixedly connected to the two first connecting pieces 3 by bolts. The two first connecting pieces 3 are fixedly connected to each other through the first cross beam 2. There are two rear longitudinal beams 5, and the two rear longitudinal beams 5 correspond one-to-one with the two first connecting pieces 3 on the rear side of the battery frame 7. The outer side of the rear longitudinal beam 5 is directly fixedly connected to the first connecting piece 3 through the second connecting piece 4. The inner side of the rear longitudinal beam 5 is fixedly connected to the first connecting piece 3 and the first cross beam 2 through the second connecting piece 4. In order to achieve lightweighting, both the front longitudinal beam 1 and the rear longitudinal beam 5 are made of aluminum alloy.

[0022] In this embodiment, two built-in longitudinal frames 73 are fixedly provided inside the battery frame 7. The built-in longitudinal frames 73 are in the same vertical plane as the two front longitudinal beams 1 and the two rear longitudinal beams 5. Through the combined action of the first crossbeam 2, the first connecting member 3 and the second connecting member 4, the force transmission effect can be improved, local stress concentration of the battery frame 7 can be avoided, the torsional resistance of the battery frame 7 can be increased, and the torsional deformation stress of the battery can be reduced.

[0023] The two built-in longitudinal frames 73 can form a double longitudinal support structure along the length of the battery frame 7. Combined with the coaxial alignment of the front longitudinal beam 1 and the rear longitudinal beam 5, the deformation resistance of the battery frame 7 under torsional conditions is greatly improved, ensuring the structural integrity of the battery pack assembly under complex stress scenarios. At the same time, the front longitudinal beam 1 and the rear longitudinal beam 5 are fixed in multiple dimensions with the first connecting piece 3 through the second connecting piece 4 on the inner and outer sides, making the longitudinal force transmission path more direct and balanced, avoiding the force from being concentrated on a single side panel structure during the transmission process, significantly enhancing the load-bearing strength of the connection parts, and improving the installation stability of the battery pack assembly and the driving safety of the whole vehicle.

[0024] like Figure 3As shown, the battery frame 7 includes a first side frame 71, a second side frame 72, and an internal vertical frame 73. There are two of each of the first side frame 71, the second side frame 72, and the internal vertical frame 73. The two first side frames 71 are arranged opposite each other to form the front and rear sides of the battery frame 7. The two second side frames 72 are arranged opposite each other and fixedly arranged between the two first side frames 71 to form the left and right sides of the battery frame 7. They are used in conjunction with the two first side frames 71 to enclose and form the main body of the battery frame 7. The two internal vertical frames 73 are arranged opposite each other and parallel to the second side frames 72. The two ends of the internal vertical frames 73 are fixedly connected to the adjacent first side frames 71.

[0025] In this embodiment, the first side frame 71 is a steel frame structure, while the second side frame 72 and the inner longitudinal frame 73 are both aluminum alloy frame structures. The first side frame 71 is fixedly connected to the second side frame 72 and the inner longitudinal frame 73 by bolts. An aluminum connecting plate 8 is also installed between the first side frame 71, the second side frame 72, and the inner longitudinal frame 73. The connecting plate 8 is vertically arranged and is fixedly connected to the first side frame 71 by bolts. The second side frame 72 and the inner longitudinal frame 73 are fixedly connected to the connecting plate 8 by welding to achieve a steel-aluminum connection. The connecting plate 8 can fix all the first horizontal tube beams 711 of the first side frame 71 to the corresponding inner longitudinal frame 73, thereby improving the connection reliability between the first side frame 71, the second side frame 72, and the inner longitudinal frame 73.

[0026] Several battery connection brackets 9 are bolted to the sides of the second side frame 72 and the inner longitudinal frame 73. The battery connection brackets 9 are L-shaped and are arranged at vertical intervals. The battery connection brackets 9 extend along the length of the vehicle frame for the purpose of fixing and installing the battery.

[0027] To improve battery placement space, the battery frame 7 is designed with a square structure, which is conducive to the assembly of battery packs. At the same time, the entire vehicle battery frame 7 is divided into three double-layer battery pack placement areas: left, middle, and right. This ensures that the entire vehicle frame uses one type of battery pack and has sufficient power capacity, making the assembly tooling on the production line simpler and more uniform.

[0028] like Figure 4 As shown, the first side frame 71 includes several welded and fixed first horizontal tube beams 711, first vertical tube beams 712, and first inclined tube beams 713. In this embodiment, there are three first horizontal tube beams 711. The three first horizontal tube beams 711 are arranged horizontally and spaced apart vertically. The two ends and the middle position of the first horizontal tube beam 711 are fixedly connected to the adjacent first horizontal tube beam 711 through the first vertical tube beam 712, and the adjacent first horizontal tube beams 711 are fixedly connected to each other through the first inclined tube beam 713. The two adjacent first inclined tube beams 713 are arranged in a V-shape.

[0029] Several second connecting holes 10 are symmetrically provided on both sides of the middle position of the first horizontal tube beam 711. The second connecting holes 10 are used for the fixed connection between the first horizontal tube beam 711 and the built-in longitudinal frame 73 and the first connecting member 3.

[0030] like Figure 5 As shown, the second side frame 72 includes several welded and fixed second horizontal tube beams 721, second vertical tube beams 722, and second inclined tube beams 723. In this embodiment, there are three second horizontal tube beams 721. The three second horizontal tube beams 721 are arranged horizontally and spaced apart vertically. The two ends and the middle position of the second horizontal tube beam 721 are fixedly connected to the adjacent second horizontal tube beams 721 through the second vertical tube beams 722. Adjacent second horizontal tube beams 721 are fixedly connected to each other through the second inclined tube beams 723. The two adjacent second inclined tube beams 723 are arranged in a V-shape.

[0031] In this embodiment, the structure of the built-in vertical frame 73 is the same as that of the second side frame 72, and the specific details will not be elaborated here.

[0032] like Figure 2 As shown, the first connector 3 includes a first connecting surface 31, a first support plate portion 32, a second connecting surface 33, a second support plate portion 34, a third connecting surface 35, and a third support plate portion 36. The first connecting surface 31, the second connecting surface 33, and the third connecting surface 35 are arranged vertically at intervals, with the first connecting surface 31 located at the top and the third connecting surface 35 located at the bottom. The first support plate portion 32 is fixedly disposed between the first connecting surface 31 and the second connecting surface 33, the second support plate portion 34 is fixedly disposed between the second connecting surface 33 and the third connecting surface 35, and the third support plate portion 36 is fixedly disposed below the third connecting surface 35. The first connecting surface 31, the second connecting surface 33, and the third connecting surface 35 are all vertical surfaces, and the plate surfaces of the first support plate portion 32, the second support plate portion 34, and the third support plate portion 36 are all perpendicular to the first connecting surface 31, the second connecting surface 33, and the third connecting surface 35.

[0033] A plurality of first connecting holes 37 are provided on the first connecting surface 31, the second connecting surface 33 and the third connecting surface 35. The first connecting holes 37 penetrate the first connecting member 3 laterally for bolt installation, and are then fixedly connected to the first crossbeam 2, the second connecting member 4 and the first cross tube beam 711 by bolts.

[0034] In this embodiment, in order to improve the support stability, reinforcing ribs are also welded and fixed between the first support plate 32, the second support plate 34 and the third support plate 36 and the first connecting member 3.

[0035] like Figure 3As shown, the first side frame 71 contains three first horizontal tube beams 711, one above, one in the middle and one below. The uppermost first horizontal tube beam 711 is bolted to the first connecting surface 31 of the first connector 3, and is supported by the first support plate 32. Similarly, the middle first horizontal tube beam 711 is bolted to the second connecting surface 33 and is supported and limited by the second support plate 34. The lowermost first horizontal tube beam 711 is bolted to the third connecting surface 35 and is supported and limited by the third support plate 36.

[0036] In this embodiment, the overall thickness of the battery frame 7 is greater than that of the front longitudinal beam 1 and the rear longitudinal beam 5. That is, the height of the upper surface of the battery frame 7 is higher than that of the front longitudinal beam 1 and the rear longitudinal beam 5, and the height of the lower surface of the battery frame 7 is lower than that of the front longitudinal beam 1 and the rear longitudinal beam 5. This facilitates the installation of large-capacity batteries, achieving both lightweighting of the frame and increased power capacity. At the same time, the first connector 3 enables effective connection between the front and rear sides of the battery frame 7 and the front and rear longitudinal beams, improving the connection strength and deformation resistance of the battery frame 7.

[0037] It is understood that in other embodiments, an outer panel may be installed on the outside of the battery frame 7 for aesthetic purposes. The specific choice can be made according to actual needs, and no further restrictions are imposed here.

[0038] The second connecting member 4 has two perpendicular sides. One side of the second connecting member 4 is fixedly connected to the side of the corresponding front longitudinal beam 1 or rear longitudinal beam 5 by bolts, and the other side of the second connecting member 4 is fixedly connected to the corresponding first connecting member 3 by bolts. The first crossbeam 2 has an internal hollow structure and an opening on one side. One end of the second connecting member 4, located inside the front longitudinal beam 1 or rear longitudinal beam 5, is inserted into the first crossbeam 2 and fixedly connected to the first crossbeam 2 by bolts to improve the overall strength and robustness of the frame.

[0039] like Figure 1 As shown, a second crossbeam 6 is fixedly installed between the two front longitudinal beams 1 and between the two rear longitudinal beams 5 to improve the torsional resistance of the front longitudinal beams 1 and the rear longitudinal beams 5. The second crossbeam 6 is a steel crossbeam.

[0040] Example 2 In another typical embodiment of the present invention, a new energy truck is proposed, including the steel-aluminum hybrid heavy truck frame mentioned in Example 1. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel-aluminum hybrid heavy truck frame, comprising: The front longitudinal beam (1), the battery frame (7) and the rear longitudinal beam (5) are sequentially connected, characterized in that the front and rear sides of the battery frame (7) are fixedly connected with two oppositely arranged first connecting pieces (3) respectively, the front longitudinal beam (1) and the rear longitudinal beam (5) correspond to the adjacent first connecting pieces (3) one by one, and the inner and outer sides of the front longitudinal beam (1) and the rear longitudinal beam (5) are fixedly connected with the corresponding first connecting pieces (3) through the second connecting pieces (4); the inside of the battery frame (7) is fixedly provided with two built-in longitudinal frames (73), and the built-in longitudinal frames (73) are in the same vertical plane as the front longitudinal beam (1) and the rear longitudinal beam (5).

2. The steel-aluminum hybrid heavy truck frame of claim 1, wherein, The two first connecting pieces (3) on the same side are fixedly connected through the first cross beam (2), and the inner sides of the front longitudinal beam (1) and the rear longitudinal beam (5) are fixedly connected with the first cross beam (2) through the second connecting pieces (4).

3. The steel-aluminum hybrid heavy truck frame of claim 1, wherein, The battery frame (7) comprises two oppositely arranged first side frames (71), the two ends of the two first side frames (71) are fixedly connected through the second side frame (72), two built-in longitudinal frames (73) are fixedly arranged between the two first side frames (71), the built-in longitudinal frames (73) are parallel to the second side frame (72), a plurality of battery connecting supports (9) are fixedly connected to the side surfaces of the second side frame (72) and the built-in longitudinal frames (73), the battery connecting supports (9) are vertically spaced, and the battery connecting supports (9) extend along the length direction of the frame.

4. The steel-aluminum hybrid heavy truck frame of claim 3, wherein, The first side frame (71) comprises a plurality of first horizontal pipe beams (711) vertically spaced, the first horizontal pipe beams (711) are fixedly connected through the first vertical pipe beams (712), a plurality of first inclined pipe beams (713) are fixedly arranged between adjacent first horizontal pipe beams (711), and a plurality of second connecting holes (10) are symmetrically arranged on both sides of the middle position of the first horizontal pipe beams (711).

5. The steel-aluminum hybrid heavy truck frame of claim 4, wherein, The first connecting piece (3) comprises a plurality of connecting surfaces vertically spaced, the connecting surface is a vertical surface, a supporting plate part is fixedly arranged below each connecting surface, the plate surface of the supporting plate part is perpendicular to the connecting surface, a plurality of first connecting holes (37) are formed in the connecting surface, and the first connecting holes (37) are connected with the second connecting holes (10) through bolts.

6. The steel-aluminum hybrid heavy truck frame of claim 5, wherein, The number of the connecting surfaces and the supporting plate parts is the same as and corresponds to the number of the first horizontal pipe beams (711), and the supporting plate parts are used for supporting the first horizontal pipe beams (711).

7. The steel-aluminum hybrid heavy truck frame of claim 3, wherein, The first side frame (71) is a steel frame structure, the second side frame (72) and the built-in longitudinal frame (73) are aluminum alloy frame structures, and an aluminum connecting backing plate (8) is arranged between the first side frame (71) and the second side frame (72) and the built-in longitudinal frame (73), and the connecting backing plate (8) is vertically arranged.

8. The steel-aluminum hybrid heavy truck frame of claim 1, wherein, The overall thickness of the battery frame (7) is greater than that of the front longitudinal beam (1) and the rear longitudinal beam (5).

9. The steel-aluminum hybrid heavy truck frame of claim 1, wherein, The front longitudinal beam (1) and the rear longitudinal beam (5) are made of aluminum alloy.

10. A new energy truck, characterized in that, A steel-aluminum hybrid heavy truck frame is provided.

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