CN110509998B - Integral pure aluminum electric vehicle frame - Google Patents

Abstract

The invention discloses an integral pure aluminum electric vehicle frame, which includes a sill beam arranged in a mirror image structure on both sides of a battery pack to carry the battery pack. One end of the sill beam is connected to the front longitudinal beam through a longitudinal beam fixing seat. The beam assembly is screwed, and the other end is screwed to the rear longitudinal beam assembly through the longitudinal beam fixed seat; the front longitudinal beam assembly is equipped with a shock absorber and an upper control arm that are riveted to it and arranged in a symmetrical structure. The rear longitudinal beam assembly is provided with a shock absorber bracket riveted to it and arranged in a symmetrical structure. The beneficial effects of the present invention are mainly reflected in: the production process is simple, and the assembly method of small-scale welding and large-scale assembly is used to ensure the accuracy of assembly and connection strength, ensuring safety while greatly improving production efficiency; in addition, it has strong Universal type with wide applicability.

Description

Integral pure aluminum electric vehicle frame

Technical field

The present invention relates to the field of automobile frames, specifically, to an integral pure aluminum electric automobile frame.

Background technique

Under the severe situation of energy and environmental issues, the development and application of electric vehicle technology has become an inevitable trend in the development of the industry. Under the current limitations of battery technology development, lightweighting the body of electric vehicles has become the best way to increase cruising range.

Competition in the modern automobile industry is fierce, and industry production capacity is far greater than market capacity. Fierce competition exists in every market segment. From economy cars to high-end commercial vehicles, various brands are competing for quality and price. Lower price for the same quality, or in other words, better quality for the same price, is the goal that OEMs are constantly pursuing.

At present, most of the all-aluminum electric vehicle body structures in the industry are load-bearing bodies, which are designed and manufactured using a combination of cast aluminum, stamped aluminum and extruded aluminum. However, this method has problems such as complex production process, difficulty in ensuring accuracy, and high production cost. At present, there are a small number of frame-type electric vehicle body structures using extruded aluminum profiles, but there are also problems such as poor versatility, poor body collision safety, poor mass production process, and insufficient connection strength with parts.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an integral pure aluminum electric vehicle frame.

The purpose of the present invention is achieved through the following technical solutions:

An integral pure aluminum electric vehicle frame includes a sill beam arranged in a mirror image structure on both sides of the battery pack to carry the battery pack. One end of the sill beam is screwed to the front longitudinal beam assembly through a longitudinal beam fixing seat. The other end is screwed to the rear longitudinal beam assembly through the longitudinal beam fixed seat, and the height of the sill beam is lower than the height of the front longitudinal beam assembly and the rear longitudinal beam assembly;

The front longitudinal beam assembly includes a first front beam and a first rear beam that are parallel to each other. The two ends of the first front beam and the first rear beam are respectively connected to the first left longitudinal beam and the first right beam that are integrated with them. Longitudinal beams are connected, one end of the first left longitudinal beam and the first right longitudinal beam is screwed to the longitudinal beam fixed seat, and the other end is screwed to the front anti-collision beam;

The rear longitudinal beam assembly includes a second front beam and a second rear beam that are parallel to each other. The two ends of the second front beam and the second rear beam are respectively connected with the second left longitudinal beam and the second right beam that are integrated with them. The longitudinal beams are connected, one end of the second left longitudinal beam and the second right longitudinal beam is screwed to the longitudinal beam fixed seat, and the other end is riveted to the rear anti-collision beam;

The first left longitudinal beam and the first right longitudinal beam are provided with a mounting bracket integrated with the shock absorber and the upper control arm which are riveted and arranged in a symmetrical structure; the second left longitudinal beam and the second right longitudinal beam are provided with an integral mounting bracket. A shock absorber bracket is riveted and arranged in a symmetrical structure.

Preferably, the first left longitudinal beam and the first right longitudinal beam are provided with concave arc-shaped structures along the length direction, and they are arranged in a mirror image; the second left longitudinal beam and the second right longitudinal beam are provided along the length direction. There is a concave arc-shaped structure, and the two are arranged in a mirror image.

Preferably, the first left longitudinal beam, the first right longitudinal beam, the second left longitudinal beam and the second right longitudinal beam are each provided with an accommodation cavity, and a reinforcing plate is provided in the accommodation cavity. The reinforcing plate The accommodating cavity is equidistantly divided into two accommodating channels.

Preferably, the mounting bracket integrating the shock absorber and the upper control arm includes a first upper cover plate and a first boss provided on the upper surface of the first upper cover plate, and the bottom of the first boss is provided with There is an installation space matching the upper mounting seat of the front shock absorber, and the first boss is also provided with a first threaded hole corresponding to the mounting seat; the lower surface of the first upper cover plate is fixed on There is a first front wall panel, a first inner wall panel, a first rear wall panel and a first outer wall panel connected in sequence. An upper control arm front liner is fixed on the outer surface of the first front wall panel. The front apron of the front accommodation cavity is provided with a first bolt hole, and the first front panel is provided with a second bolt hole corresponding to the first bolt hole; A rear apron is fixed on the outer surface of a rear apron to form a receiving cavity behind the rear bushing of the upper control arm. The rear apron is provided with a third bolt hole, and the first rear apron is provided with a The third bolt hole corresponds to a fourth bolt hole.

Preferably, a first rib extends from both the first front wall and the first rear wall, the bottom surface of the first rib is fixed to the upper surface of the first support plate, and the first support The inner side of the board is fixedly connected to the first inner wall panel, and the first support plate is provided with a set of first mounting holes connected to the first left longitudinal beam/first right longitudinal beam; the inner wall panel The bottom is also provided with a set of connecting holes connected to the first left longitudinal beam/first right longitudinal beam.

Preferably, the shock absorber bracket includes a second upper cover plate and a second front wall panel, a second inner wall panel, and a second rear wall panel that are connected in sequence on the lower surface of the second upper cover plate. plate and a second peripheral plate, the upper surface of the second upper cover plate is provided with a cylindrical second boss, the central axis of the second boss is coaxial with the central axis of the body; the third The bottom of the two bosses is provided with an installation space that matches the mounting seats on the shock absorber, and the second boss is provided with three threaded holes corresponding to the mounting seats.

Preferably, a second rib extends from both the second front wall and the second rear wall, the bottom surface of the second rib is fixed to the upper surface of the second support plate, and the second support The inner side of the board is fixedly connected to the second inner wall panel, and the second support plate is provided with a set of second mounting holes connected to the second left longitudinal beam/second right longitudinal beam; the second inner wall panel The bottom of the board is also provided with a set of second connection holes connected to the second left longitudinal beam/the second right longitudinal beam.

Preferably, a front link welding bracket and a rear link welding bracket are provided on the lower surfaces of the second left longitudinal beam and the second right longitudinal beam, and the front link welding bracket is close to the second front cross beam. , the rear link welding bracket is located directly below the shock absorber bracket; the second rear cross member is also provided with a rear subframe connecting column on the lower surface, and the rear subframe connecting column is welded on the lower surface There is a rear subframe connecting plate.

Preferably, a front subframe connecting column is also provided on the lower surface of the first front cross member, and a front subframe connecting plate is welded on the lower surface of the front subframe connecting column.

Preferably, the longitudinal beam fixing base at least includes a main body that is bent in space and is in the shape of an arm. The upper half of the main body is provided with a support for accommodating the first left longitudinal beam/first right longitudinal beam/second The first accommodating groove of the left longitudinal beam/the second right longitudinal beam is provided on both sides of the first accommodating groove on the main body to accommodate the first left longitudinal beam/first right longitudinal beam. /The first locking hole for locking the second left longitudinal beam/the second right longitudinal beam; the lower half of the main body is provided with a second accommodating groove for accommodating the sill beam. A second locking hole is provided on both sides of the slot for connecting to the sill beam and locking the main body.

Preferably, the inner surface of the sill beam is protruding along its axis with a lower load-bearing plate that is integrated with the lower load-bearing plate. The lower load-bearing plate is fixedly connected to the upper load-bearing plate of the battery pack, and the lower load-bearing plate and The upper load-bearing plates are in surface contact with each other; the cross-section of the lower load-bearing plate is fan-shaped, with a hollow cavity inside, and its cross-section is a straight line segment and an arc segment, and the straight segment is used to contact the upper load-bearing plate. The plate is fixedly connected; the sill beam is provided with a receiving cavity, and the receiving cavity is provided with a reinforcing plate integrated with the sill beam. The arc section is at the contact point with the inner side of the sill beam. The pressure generated passes completely vertically through the reinforcing plate.

The beneficial effects of the present invention are mainly reflected in:

1. The production process of this frame is simple, using small-scale welding and large-scale assembly to ensure assembly accuracy and connection strength, ensuring safety while greatly improving production efficiency;

2. In the present invention, the door sill beam, longitudinal beam fixed seat, front longitudinal beam assembly, front anti-collision beam and rear anti-collision beam and other components are all made of aluminum profiles. The density of aluminum alloy is smaller than that of steel. Therefore, the present invention The weight of the provided sill beam is less than that of the existing technology, achieving lightweighting of the vehicle;

3. In the present invention, the center sill beam, longitudinal beam fixed seat, front longitudinal beam assembly, front anti-collision beam, rear anti-collision beam and other components are all connected by bolts. The connection structure is convenient and easy to replace and repair. At the same time, the connection strength is high Relatively high, the torsional stiffness increases;

4. The longitudinal beam fixing seat of the present invention can be used to connect multiple components in the frame, and is highly versatile and has wide applicability.

Description of drawings

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings:

Figure 1: perspective view of the present invention;

Figure 2: A perspective view of the front longitudinal beam assembly in the present invention;

Figure 3: A perspective view of the rear longitudinal beam assembly in the present invention;

Figure 4: A cross-sectional view of any one of the first left longitudinal beam, the first right longitudinal beam, the second left longitudinal beam and the second right longitudinal beam in the present invention;

Figure 5: A perspective view of the sill beam in the present invention;

Figure 6: Partial cross-sectional view of the sill beam and battery pack in the present invention.

Detailed ways

The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention. Structural, method, or functional changes made by those of ordinary skill in the art based on these embodiments are all included in the protection scope of the present invention.

This invention is not limited to the present invention. Any structural, method, or functional changes made by those of ordinary skill in the art based on these embodiments are included in the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and The simplified description is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 to 6, the present invention discloses an integral pure aluminum electric vehicle frame, including a sill beam 1 arranged in a mirror image structure on both sides of a battery pack to carry the battery pack. The sill beam The structure of 1 is an existing technology, and its structure will not be described in detail here. One end of the sill beam 1 is screwed to the front longitudinal beam assembly 3 through the longitudinal beam fixing seat 2, and the other end is screwed to the rear longitudinal beam assembly 4 through the longitudinal beam fixing seat 2. The height of the sill beam 1 Lower than the height of the front longitudinal beam assembly 3 and the rear longitudinal beam assembly 4. The threaded connection in the present invention refers to a threaded connection, for example, using bolts, screws, etc.

The specific structures of the rear longitudinal beam assembly 4 and the front longitudinal beam assembly 3 are briefly described below:

The front longitudinal beam assembly 3 includes a first front beam 31 and a first rear beam 32 that are parallel to each other. The two ends of the first front beam 31 and the first rear beam 32 are respectively connected to the first left longitudinal beam that is integrated with them. The beam 33 is connected to the first right longitudinal beam 34. One end of the first left longitudinal beam 33 and the first right longitudinal beam 34 is screwed to the longitudinal beam fixing seat 2, and the other end is screwed to the front anti-collision beam 5. The structure of the front anti-collision beam 5 is an existing technology and is not the key point of protection of the present invention, and its structure will not be described in detail here. Furthermore, a front subframe connecting column 35 is provided on the lower surface of the first front cross member 31 , and a front subframe connecting plate 36 is welded on the lower surface of the front subframe connecting column 35 .

The rear longitudinal beam assembly 4 includes a second front beam 41 and a second rear beam 42 that are parallel to each other. The two ends of the second front beam 41 and the second rear beam 42 are respectively connected to the second left longitudinal beam that is integrated with them. The beam 43 is connected to the second right longitudinal beam 44. One end of the second left longitudinal beam 43 and the second right longitudinal beam 44 is screwed to the longitudinal beam fixed seat 2, and the other end is riveted to the rear anti-collision beam 6, so The structure of the rear anti-collision beam 6 is an existing technology and is not the key point of protection of the present invention, and its structure will not be described in detail here. Further, a front link welding bracket 45 and a rear link welding bracket 46 are provided on the lower surfaces of the second left longitudinal beam 43 and the second right longitudinal beam 44. The front link welding bracket 45 and the The second front cross member 41 is close to the rear link welding bracket 46 and is located directly below the shock absorber bracket 8 . A rear subframe connecting column 47 is also provided on the lower surface of the second rear cross member 42 , and a rear subframe connecting plate 48 is welded on the lower surface of the rear subframe connecting column 47 . The front link welding bracket 45 is close to the second front cross member 41, and the second left longitudinal beam 43, the second right longitudinal beam 44 and the second front cross beam 41 can integrally bear the upper part of the front link welding bracket 45. gravity to avoid distortion and deformation under long-term work and extend its service life.

The key point of the design of the present invention is that the first left longitudinal beam 33 and the first right longitudinal beam 34 are provided with concave arc-shaped structures along the length direction, and the two are arranged in a mirror image. The second left longitudinal beam 43 and the second right longitudinal beam 44 are provided with concave arc-shaped structures along the length direction, and they are arranged in a mirror image. When a vehicle collides, the concave design of the first left longitudinal beam 33 and the first right longitudinal beam 34, the second left longitudinal beam 43 and the second right longitudinal beam 44 makes the left longitudinal beam and the right longitudinal beam have greater resistance. Elastic deformation can relieve part of the impact force, thereby enhancing the compression resistance of the subframe. In addition, the first left longitudinal beam 33, the first right longitudinal beam 34, the second left longitudinal beam 43 and the second right longitudinal beam 44 are each provided with an accommodation cavity 39, and the accommodation cavity 39 is provided with an accommodation cavity 39. Reinforcement plate 38 divides the accommodation cavity 39 into two accommodation channels 37 equidistantly. The arrangement of the reinforcing plate 38 can strengthen and support the first left longitudinal beam 33 , the first right longitudinal beam 34 , the second left longitudinal beam 43 and the second right longitudinal beam 44 , preventing the first left longitudinal beam from collapsing. The longitudinal beam 33, the first right longitudinal beam 34, the second left longitudinal beam 43 and the second right longitudinal beam 44 are deformed under the gravity of long-term components, and the first left longitudinal beam 33 and the first right longitudinal beam are lengthened. 34. The service life of the second left longitudinal beam 43 and the second right longitudinal beam 44.

In the present invention, the first left longitudinal beam 33 and the first right longitudinal beam 34 are provided with an integral mounting bracket 7 with a shock absorber and an upper control arm that are riveted and arranged in a symmetrical structure. The mounting bracket 7 integrating the shock absorber and the upper control arm includes a first upper cover plate 71 and a first boss 72 provided on the upper surface of the first upper cover plate 71 . The bottom is provided with an installation space that matches the upper mounting seat of the front shock absorber, and the first boss 72 is also provided with a first threaded hole 73 corresponding to the mounting seat. Installing the shock absorber inside the first boss 72 can reduce the peripheral size of the mounting bracket to the greatest extent, thereby reducing weight and releasing space for arranging other components.

The first front panel 74, the first inner panel 75, the first rear panel 76, and the first peripheral panel 77 are fixed on the lower surface of the first upper cover 71 and are connected in sequence. A front apron 78 is fixed on the outer surface of a front apron 74 to form a front receiving cavity 781 for the upper control arm front bushing. The front apron 78 is provided with a first bolt hole 782. The first front apron 78 is provided with a first bolt hole 782. The plate 74 is provided with a second bolt hole 741 corresponding to the first bolt hole 782 . A rear apron 79 is fixed on the outer surface of the first rear apron 76 to form a rear accommodating cavity 791 of the upper control arm rear bushing. The rear apron 79 is provided with a third bolt hole 792. A rear panel 76 is provided with a fourth bolt hole 761 corresponding to the third bolt hole 792 . Of course, other locking structures can also be used, which all fall within the scope of the present invention and are not specifically limited.

A first rib 80 extends from both the first front wall 74 and the first rear wall 76. Compared with the prior art, placing the first rib outside the mounting bracket can greatly simplify the installation process. Processing and molding process. The bottom surface of the first rib 80 is fixed to the upper surface of the first support plate 801 , and the inner side of the first support plate 801 is fixed to the first inner wall panel 75 . The first support plate 801 There is a set of first mounting holes 802 connected to the first left longitudinal beam 33/first right longitudinal beam 34. The arrangement of the first mounting holes 802 can reduce the force exerted by the shock absorber when the suspension is subjected to vertical impact force. torque of the mounting bracket. The bottom of the inner wall panel 4 is also provided with a set of connection holes 803 connected to the first left longitudinal beam 33 / the first right longitudinal beam 34 .

In the present invention, the second left longitudinal beam 43 and the second right longitudinal beam 44 are provided with shock absorber brackets 8 riveted thereto and arranged in a symmetrical structure. The shock absorber bracket 8 includes a second upper cover 81 and a second front wall panel 82, a second inner wall panel 83, and a second front wall panel 82, a second inner wall panel 83, and a second front wall panel 82, a second inner wall panel 83, and a second front wall panel 82, a second inner wall panel 83, and a second upper cover panel 81. The rear panel 84 and the second peripheral panel 85 are provided with a cylindrical second boss 86 on the upper surface of the second upper cover 81. The central axis of the second boss 86 is aligned with the central axis of the body. The axes are coaxial. The bottom of the second boss 86 is provided with an installation space that matches the mounting seat on the shock absorber. The second boss is provided with three threaded holes 87 corresponding to the mounting seat. Installing the shock absorber inside the second boss can reduce the peripheral size of the mounting bracket to the greatest extent, thereby reducing weight and releasing space for arranging other components.

A second rib 88 extends from both the second front wall 82 and the second rear wall 84. Compared with the prior art, placing the second rib outside the mounting bracket can greatly simplify the installation process. Processing and molding process. The bottom surface of the second rib 88 is fixed to the upper surface of the second support plate 89 , and the inner side of the second support plate 89 is fixed to the second inner wall plate 83 . The second support plate 89 There is a set of second mounting holes 891 connected to the second left longitudinal beam 43/second right longitudinal beam 44. The arrangement of the first mounting holes 802 can reduce the shock absorber exerted when the suspension is subjected to vertical impact force. torque on the mounting bracket. The bottom of the second inner wall panel 83 is also provided with a set of second connection holes 892 connected to the second left longitudinal beam 43 / the second right longitudinal beam 44 .

The longitudinal beam fixing seat 2 at least includes a main body 21 that is shaped like an arm in space. The upper half of the main body 21 is provided with a structure for accommodating the first left longitudinal beam 33/first right longitudinal beam 34/ The first receiving groove 22 of the second left longitudinal beam 43 / the second right longitudinal beam 44 is provided on both sides of the first receiving groove 22 and is opened on the main body 21 to store the first left longitudinal beam. The first locking hole 23 is used to lock the beam 33/first right longitudinal beam 34/second left longitudinal beam 43/second right longitudinal beam 44. The lower half of the main body 21 is provided with a second accommodating groove 24 for accommodating the sill beam 1. There are two accommodating grooves 24 on both sides of the second accommodating groove 24, which are opened on the main body 21 for connection. The sill beam 1 is locked with a second locking hole 25 . The longitudinal beam fixing seat realizes the screw connection between the sill beam and the longitudinal beam. The connection method is simple and convenient, which is convenient for replacement and maintenance. At the same time, the connection strength is relatively high and the torsional rigidity is large.

In the present invention, a lower load-bearing plate 11 integrated with the sill beam 1 is protruding from the inner surface along its axis. The lower load-bearing plate 11 and the sill beam 1 adopt an integral design. Therefore, the sill beam and the lower sill beam 1 are integrally designed. The load-bearing plate can bear the gravity of the battery pack as a whole, the structural performance is greatly enhanced, the torsional stiffness is enhanced, and it can effectively resist positive and negative torque. The lower load-bearing plate 11 is fixedly connected to the upper load-bearing plate 9 of the battery pack, and the lower load-bearing plate 11 and the upper load-bearing plate 9 are in surface contact. By using the surface contact, they can operate under the same gravity of the battery pack. , reduce the pressure to the greatest extent and extend the service life of the sill beam. The cross-section of the lower load-bearing plate 11 is fan-shaped, with a hollow cavity 12 inside. Its cross-section is a straight line segment 13 and an arcuate segment 14. The straight line segment 13 is used to be fixedly connected to the upper load-bearing plate 9. , a set of internal threaded holes 18 are provided on it. The sill beam 1 is provided with an accommodating cavity 15. The accommodating cavity 15 is provided with a reinforcing plate 15 integrated with the sill beam 1. The arc section 14 is on the inner side of the sill beam 1. The pressure generated at the contact point 16 passes completely vertically through the reinforcing plate 13 . This arrangement can make the supporting force of the arc segment relatively strong, prevent the sill beam 1 from deforming under the action of the gravity of the long-term battery pack, and extend the service life of the sill beam 1 .

In addition, in this embodiment, the door sill beam 1, longitudinal beam fixing seat 2, front longitudinal beam assembly 3, front anti-collision beam 5 and rear anti-collision beam 6 are all made of aluminum profiles. This is because the density of aluminum alloy is smaller than that of steel. The density of the door sill beam provided by the present invention is smaller than that of the prior art, thus achieving a lightweight vehicle. At the same time, the sill beam 1, longitudinal beam fixing seat 2, front longitudinal beam assembly 3, front anti-collision beam 5 and rear anti-collision beam 6 are all connected by bolts. The connection structure is convenient and easy to replace and repair. At the same time, the connection strength is relatively high and the torsional stiffness increases.

It should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity. Persons skilled in the art should take the specification as a whole and understand each individual solution. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of feasible implementations of the present invention. They are not intended to limit the protection scope of the present invention. Any equivalent implementations or implementations that do not deviate from the technical spirit of the present invention are not intended to limit the protection scope of the present invention. All changes should be included in the protection scope of the present invention.

Claims (9)

1. Integral pure aluminum electric automobile frame, its characterized in that: the battery pack comprises threshold beams (1) which are arranged on two sides of the battery pack in a mirror image structure and used for bearing the battery pack, one ends of the threshold beams (1) are in threaded connection with a front longitudinal beam assembly (3) through longitudinal beam fixing seats (2), the other ends of the threshold beams are in threaded connection with a rear longitudinal beam assembly (4) through the longitudinal beam fixing seats (2), and the heights of the threshold beams (1) are lower than those of the front longitudinal beam assembly (3) and the rear longitudinal beam assembly (4);

the front longitudinal beam assembly (3) comprises a first front transverse beam (31) and a first rear transverse beam (32) which are parallel to each other, two ends of the first front transverse beam (31) and the first rear transverse beam (32) are respectively connected with a first left longitudinal beam (33) and a first right longitudinal beam (34) which are integrated with the first front transverse beam and the first rear transverse beam, one ends of the first left longitudinal beam (33) and the first right longitudinal beam (34) are in threaded connection with the longitudinal beam fixing seat (2), and the other ends of the first left longitudinal beam and the first right longitudinal beam are in threaded connection with the front anti-collision beam (5);

the rear longitudinal beam assembly (4) comprises a second front transverse beam (41) and a second rear transverse beam (42) which are parallel to each other, two ends of the second front transverse beam (41) and the second rear transverse beam (42) are respectively connected with a second left longitudinal beam (43) and a second right longitudinal beam (44) which are integrated with the second front transverse beam and the second rear transverse beam, one ends of the second left longitudinal beam (43) and the second right longitudinal beam (44) are in threaded connection with the longitudinal beam fixing seat (2), and the other ends of the second left longitudinal beam and the second right longitudinal beam are riveted with the rear anti-collision beam (6);

the first left longitudinal beam (33) and the first right longitudinal beam (34) are provided with a shock absorber and an upper control arm integrated mounting bracket (7) which are riveted with the first left longitudinal beam and the first right longitudinal beam and are symmetrically arranged; the second left longitudinal beam (43) and the second right longitudinal beam (44) are provided with shock absorber brackets (8) which are riveted with the second left longitudinal beam and the second right longitudinal beam and are symmetrically arranged; the longitudinal beam fixing seat (2) at least comprises a main body (21) which is bent in an arm shape in space, a first accommodating groove (22) for accommodating the first left longitudinal beam (33) or the first right longitudinal beam (34) or the second left longitudinal beam (43) or the second right longitudinal beam (44) is formed in the upper half part of the main body (21), and first locking holes (23) which are formed in the main body (21) and used for locking the first left longitudinal beam (33) or the first right longitudinal beam (34) or the second left longitudinal beam (43) or the second right longitudinal beam (44) are formed in two sides of the first accommodating groove (22); a second accommodating groove (24) for accommodating the threshold beam (1) is formed in the lower half part of the main body (21), and second locking holes (25) which are formed in the main body (21) and used for connecting the threshold beam (1) for locking are formed in two sides of the second accommodating groove (24); the inner side surface of the threshold beam (1) is convexly provided with a lower bearing plate (11) which is integrated with the threshold beam along the axis of the threshold beam, the lower bearing plate (11) is fixedly connected with an upper bearing plate (9) of the battery pack, and the lower bearing plate (11) and the upper bearing plate (9) are in surface contact; the cross section of the lower bearing plate (11) is fan-shaped, a hollow cavity (12) is arranged in the lower bearing plate, the cross section of the lower bearing plate is a straight line section (13) and an arc section (14), and the straight line section (13) is fixedly connected with the upper bearing plate (9); the door sill beam (1) is internally provided with a containing cavity, a reinforcing plate integrated with the door sill beam (1) is arranged in the containing cavity, and the pressure generated by the arc-shaped section (14) at the contact point (16) with the inner side surface of the door sill beam (1) completely and vertically passes through the reinforcing plate.

2. The monolithic pure aluminum electric vehicle frame of claim 1, wherein: the first left longitudinal beam (33) and the first right longitudinal beam (34) are provided with concave arc structures along the length direction and are arranged in a mirror image mode; the second left longitudinal beam (43) and the second right longitudinal beam (44) are provided with concave arc structures along the length direction and are arranged in a mirror image mode.

3. The monolithic pure aluminum electric vehicle frame of claim 2, wherein: the novel structure is characterized in that a containing cavity (39) is formed in each of the first left longitudinal beam (33), the first right longitudinal beam (34), the second left longitudinal beam (43) and the second right longitudinal beam (44), a reinforcing plate (38) is arranged in the containing cavity (39), and the reinforcing plate (38) is used for equally dividing the containing cavity (39) into two containing channels (37).

4. The monolithic pure aluminum electric vehicle frame of claim 3, wherein: the mounting bracket (7) integrating the shock absorber and the upper control arm comprises a first upper cover plate (71) and a first boss (72) arranged on the upper surface of the first upper cover plate (71), wherein a mounting space matched with a mounting seat on the front shock absorber is arranged at the bottom of the first boss (72), and a first threaded hole (73) corresponding to the mounting seat is further formed in the first boss (72); the lower surface of the first upper cover plate (71) is fixedly provided with a first front coaming (74), a first inner coaming (75), a first rear coaming (76) and a first outer coaming (77) which are sequentially connected in pairs, the outer side surface of the first front coaming (74) is fixedly provided with a front coaming (78) which forms a front bushing accommodating cavity (781) of the upper control arm, the front coaming (78) is provided with a first bolt hole (782), and the first front coaming (74) is provided with a second bolt hole (741) corresponding to the first bolt hole (782); a rear apron (79) forming an upper control arm rear bushing rear accommodating cavity (791) is fixedly arranged on the outer side face of the first rear coaming (76), a third bolt hole (792) is formed in the rear apron (79), and a fourth bolt hole (761) corresponding to the third bolt hole (792) is formed in the first rear coaming (76).

5. The monolithic pure aluminum electric vehicle frame of claim 4, wherein: a first rib plate (80) extends from each of the first front coaming (74) and the first rear coaming (76), the bottom surface of the first rib plate (80) is fixedly connected with the upper surface of a first supporting plate (801), the inner side surface of the first supporting plate (801) is fixedly connected with the first inner coaming (75), and a group of first mounting holes (802) connected with a first left longitudinal beam (33) or a first right longitudinal beam (34) are formed in the first supporting plate (801); the bottom of the first inner coaming (75) is also provided with a group of connecting holes (803) connected with the first left longitudinal beam (33) or the first right longitudinal beam (34).

6. The monolithic pure aluminum electric vehicle frame of claim 3, wherein: the shock absorber support (8) comprises a second upper cover plate (81) and a second front coaming (82), a second inner coaming (83), a second rear coaming (84) and a second outer coaming (85) which are arranged on the lower surface of the second upper cover plate (81) and are sequentially connected in pairs, a cylindrical second boss (86) is arranged on the upper surface of the second upper cover plate (81), and the central axis of the second boss (86) is coaxial with the central axis of the body; the bottom of second boss (86) is equipped with mount pad assorted installation space on the bumper shock absorber, be equipped with three on the second boss with screw hole (87) corresponding to the mount pad.

7. The monolithic pure aluminum electric vehicle frame of claim 6, wherein: a second rib plate (88) extends from the second front coaming (82) and the second back coaming (84), the bottom surface of the second rib plate (88) is fixedly connected with the upper surface of a second supporting plate (89), the inner side surface of the second supporting plate (89) is fixedly connected with the second inner coaming (83), and a group of second mounting holes (891) connected with a second left longitudinal beam (43) or a second right longitudinal beam (44) are formed in the second supporting plate (89); the bottom of the second inner coaming (83) is also provided with a group of second connecting holes (892) connected with the second left longitudinal beam (43) or the second right longitudinal beam (44).

8. The monolithic pure aluminum electric vehicle frame of any one of claims 5 or 7, wherein: a front connecting rod welding bracket (45) and a rear connecting rod welding bracket (46) are arranged on the lower surfaces of the second left longitudinal beam (43) and the second right longitudinal beam (44), the front connecting rod welding bracket (45) is close to the second front cross beam (41), and the rear connecting rod welding bracket (46) is positioned under the shock absorber bracket (8); and a rear auxiliary frame connecting column (47) is further arranged on the lower surface of the second rear cross beam (42), and a rear auxiliary frame connecting plate (48) is welded on the lower surface of the rear auxiliary frame connecting column (47).

9. The monolithic pure aluminum electric vehicle frame of claim 8, wherein: the front auxiliary frame connecting column (35) is further arranged on the lower surface of the first front cross beam (31), and a front auxiliary frame connecting plate (36) is welded on the lower surface of the front auxiliary frame connecting column (35).