A vehicle frame assembly, vehicle chassis and vehicle

Abstract

The application relates to the technical field of vehicles, in particular to a vehicle frame assembly, a vehicle chassis and a vehicle. The vehicle frame assembly comprises a front section, a middle section and a rear section arranged in sequence along a first direction; the middle section comprises side beams arranged at intervals along a second direction, front and rear cross beams arranged at intervals along the first direction, and the two ends of the side beams are connected to the front and rear sections, and the two ends of the front and rear cross beams are respectively connected to the two side beams to form a battery pack containing area. The height of the side beams along a third direction is less than the height of the longitudinal beams of the front and rear sections; the side beams comprise first and second longitudinal beams adjacent to each other, the second longitudinal beam is between the containing area and the first longitudinal beam, the third direction height of the first longitudinal beam is greater than that of the second longitudinal beam, the bottom surface of the second longitudinal beam is higher than that of the first longitudinal beam to form an inverted triangular area, and the bottom surfaces of the two longitudinal beams are both provided with battery pack connecting and fixing through holes. The structure guarantees the rigidity and side collision safety of the vehicle frame, expands the battery pack arrangement space, simultaneously improves the battery capacity and the oil tank volume, and optimizes the vehicle endurance performance.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a frame assembly, vehicle chassis, and vehicle. Background Technology

[0002] Users of hybrid off-road vehicles expect larger battery capacity and a larger fuel tank to achieve longer all-electric range and greater cruising range. The existing chassis has a frame under which the battery pack and fuel tank are mounted; the fuel tank is located behind the battery pack. The total length under the frame used to house the battery pack and fuel tank is fixed, and the spaces for the battery pack and fuel tank are mutually constrained.

[0003] In related technologies, considering side-impact safety, sufficient clearance needs to be reserved between the battery pack and the vehicle frame, further limiting the width and capacity of the battery pack. Limited by chassis space and safety considerations, it's difficult to simultaneously achieve a large battery capacity and a large fuel tank volume, thus restricting vehicle performance improvements. Furthermore, fast-charging and rear-drive interfaces are typically installed at the rear of the battery pack, connected to the fast-charging socket and rear-drive motor respectively via high-voltage cables. The large diameter and bending radius of the fast-charging and rear-drive cables mean they occupy significant layout and assembly space, further limiting the available space in the fuel tank. Approximately 20% of the space within the battery pack is used for the distribution box and electronic modules, limiting the placement space for the battery modules, which in turn limits the battery pack's capacity and the vehicle's pure electric range. Summary of the Invention

[0004] This application aims to provide a frame assembly, vehicle chassis, and vehicle to at least solve the technical problem in the related art that, due to limitations in chassis space and safety, it is difficult to simultaneously achieve a large capacity of the battery pack and a large capacity of the fuel tank, thus limiting the improvement of vehicle performance.

[0005] In a first aspect, this application provides a vehicle frame assembly, including a front section of the frame, a middle section of the frame, and a rear section of the frame arranged sequentially along a first direction; The vehicle frame includes side beams spaced apart along a second direction, and front and rear crossbeams spaced apart along a first direction. The two ends of the side beams are respectively connected to the front and rear sections of the vehicle frame. The two ends of the front and rear crossbeams are respectively connected to the two side beams to enclose and form a battery pack accommodating area. Wherein, the height of the side beam along the third direction is less than the height of the longitudinal beams of the front section and the rear section of the frame; the side beam includes a first longitudinal beam and a second longitudinal beam, the first longitudinal beam and the second longitudinal beam are arranged along the second direction, the second longitudinal beam is located between the placement area and the first longitudinal beam, and the height of the first longitudinal beam along the third direction is greater than that of the second longitudinal beam.

[0006] In some embodiments, the second longitudinal beam is in the same length direction as the first longitudinal beam, wherein the bottom surface of the second longitudinal beam is higher than the bottom surface of the first longitudinal beam in the third direction to form an inverted triangular region, and the bottom surfaces of the second longitudinal beam and the first longitudinal beam are respectively provided with a plurality of through holes, the through holes being used for connecting and fixing the battery pack.

[0007] Compared with the prior art, the technical solution provided in the first aspect of this application has at least the following beneficial effects or advantages: The frame assembly provided in this application is a three-section structure comprising a front section, a mid section, and a rear section. In the mid section, spaced-apart side beams, along with spaced-apart front and rear crossbeams, enclose a battery pack housing area, providing a stable mounting base for the battery pack. The side beams employ a double-beam structure with a first and second longitudinal beam arranged along a second direction. The second longitudinal beam is positioned between the housing area and the first longitudinal beam, while the height of the first longitudinal beam along the third direction is greater than that of the second longitudinal beam. The overall height of the side beams in the mid section along the third direction is less than the height of the longitudinal beams in the front and rear sections. This higher first longitudinal beam design can bear the main lateral loads and impact force transmission of the frame, ensuring the overall structural rigidity and side-impact protection capability of the frame, without requiring... By reserving a large safety clearance between the battery pack and the frame, the lateral usable width of the battery pack housing area is effectively widened, providing more space for battery pack arrangement. The overall height of the frame's mid-section side beam is lower than that of the front and rear longitudinal beams, and the second longitudinal beam has a lower vertical height, which lowers the mounting reference plane of the battery pack, freeing up vertical arrangement space under the frame. At the same time, the increased capacity brought by the expansion of the battery pack's lateral space, along with more longitudinal arrangement space allocated to the fuel tank behind the battery pack, increases the usable volume of the fuel tank and the vehicle's overall cruising range. Without changing the overall longitudinal installation dimensions of the frame, both the battery pack's capacity and the fuel tank's volume are simultaneously increased, adapting to the off-road vehicle's needs for long range and ability to handle complex road conditions, effectively improving the vehicle's overall performance.

[0008] Secondly, this application provides a vehicle chassis, comprising: The frame assembly as described in any of the first aspects above; The battery pack is installed in the middle section of the frame of the frame assembly; At least two base plates, each mounted on one of the two side beams, with their length extending along the first direction; and Mounting brackets are respectively disposed at the ends of the rear section of the vehicle frame near the two side beams, wherein the base plate and the mounting brackets are used for supporting and fixing the battery pack.

[0009] In some embodiments, the battery pack includes a housing, a battery module disposed within the housing, and electrical compartments respectively disposed on both end faces of the housing in the second direction, the electrical compartments being used to accommodate an electrical box and a battery pack control module; Wherein, the two ends of the electrical compartment extend along the first direction respectively, and the length of the electrical compartment along the first direction is less than the length of the box body and the side beam; at least one box body cross beam and one box body longitudinal beam are provided in the box body, the two ends of the box body cross beam extend toward the two electrical compartments respectively, and the box body longitudinal beam and the box body cross beam are arranged to intersect each other.

[0010] In some embodiments, the enclosure is provided with multiple side supports on both sides where the electrical compartment is located; the top surface of the electrical compartment is provided with multiple first mounts and second mounts, wherein the first mounts and the second mounts are staggered in the second direction, and the second mounts are provided on the side of the electrical compartment closer to the side supports; Wherein, after the battery pack is installed on the vehicle frame assembly, the first mount is fixedly connected to the bottom end face of the first longitudinal beam, and the side bracket and the second mount are fixedly connected to the bottom end face of the second longitudinal beam, so that the electrical compartment is at least partially located in the area below the side beam.

[0011] In some embodiments, a plurality of first mounting holes are provided on the outer side of the first longitudinal beam away from the second longitudinal beam; The base plate includes a connecting part and a support part integrally formed with the connecting part. The plane where the support part is located intersects the plane where the connecting part is located. At least a portion of the connecting part is fixedly connected to the outer end face of the first longitudinal beam through the first mounting hole. When the base plate is installed on the first longitudinal beam, a receiving cavity for accommodating the electrical compartment is formed between the support part and the bottom surface of the side beam, and the receiving cavity is set to open towards the accommodating area.

[0012] In some embodiments, the support portion is provided with a second mounting hole for connecting to the housing, a third mounting hole for connecting to the first mount, and at least one sleeve for connecting to the first longitudinal beam; a connecting plate for connecting the connecting portion is fixedly provided on the sleeve.

[0013] In some embodiments, the length of the receiving cavity along the first direction is greater than the length of the electrical compartment.

[0014] In some embodiments, the end face of the housing near the rear section of the frame is respectively provided with a third mount and a fourth mount connected to the two brackets, and the end of the two mounting brackets opposite to the third mount and the fourth mount extends from the bottom of the rear crossbeam to be fixedly connected to the longitudinal beam of the rear section of the frame.

[0015] Compared with the prior art, the technical solution provided in the first aspect of this application has at least the following beneficial effects or advantages: The vehicle chassis provided in this application forms a multi-point stable support system through the base plate and the mounting bracket set at the rear of the frame. This system securely positions and installs the battery pack in the middle of the frame, ensuring the battery pack's installation stability and vibration and impact resistance under complex off-road conditions, thus adapting to the all-scenario usage needs of off-road vehicles. The battery pack utilizes electrical compartments on both sides of the housing, centrally housing the electrical box and battery pack control module within these compartments. This allows for the complete transfer of power distribution and control components that previously occupied internal space to the external lateral space, freeing up internal space previously occupied by electrical modules. This increases the available volume for battery module placement within the housing, enabling more battery modules to be installed within the same housing dimensions, effectively improving the battery pack's energy reserves and the vehicle's pure electric range. The longitudinal ends of the electrical compartment are staggered with the longitudinal ends of the housing, providing ample operating space for the installation of the fast charging interface and rear drive interface at the longitudinal ends of the battery pack, as well as for the laying of large-diameter high-voltage cables. This eliminates the need to occupy additional longitudinal space behind the battery pack, avoiding the compression of the fuel tank's usable volume caused by the bending radius requirements of the high-voltage cables. Within the fixed longitudinal length of the vehicle frame, more space is reserved for the fuel tank, achieving a simultaneous increase in fuel tank volume. Without sacrificing vehicle collision safety and off-road performance, a longer pure electric driving range is simultaneously achieved, improving the vehicle's overall performance.

[0016] Thirdly, this application also provides a vehicle comprising a vehicle chassis as described in any of the second aspects above.

[0017] It should be noted that the technical effects achievable by the technical solution provided in the third aspect of this application are described in the relevant description of the first aspect above, and will not be repeated here.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial cross-sectional view of an existing vehicle frame provided according to an embodiment of this application; Figure 2 This is a structural schematic diagram of an existing vehicle frame assembly provided according to an embodiment of this application; Figure 3 This is yet another structural schematic diagram of an existing vehicle frame assembly provided according to an embodiment of this application; Figure 4 This is a structural schematic diagram of the frame assembly provided according to an embodiment of this application; Figure 5 This is a partial structural diagram of the middle section of the vehicle frame provided according to an embodiment of this application; Figure 6 It is based on Figure 5 A cross-sectional view along the AA direction; Figure 7 This is a partial sectional view of the side beam of the vehicle frame in accordance with an embodiment of this application; Figure 8 This is a structural schematic diagram of a vehicle chassis provided according to an embodiment of this application; Figure 9 This is a first-view structural schematic diagram of a battery pack according to an embodiment of this application; Figure 10 This is a schematic diagram of the battery pack with the cover removed according to an embodiment of this application; Figure 11 This is a second-view structural schematic diagram of the battery pack according to an embodiment of this application; Figure 12 This is a structural schematic diagram of the middle section of a vehicle chassis provided according to an embodiment of this application; Figure 13 It is based on Figure 12 A cross-sectional view along the BB direction; Figure 14 This is a schematic diagram of the structure of the base plate provided according to an embodiment of this application; Figure 15 This is a schematic diagram of the electrical compartment after installation according to an embodiment of this application; Figure 16 This is a partial structural schematic diagram of an automobile chassis provided according to an embodiment of this application.

[0021] Figure label: 100. Chassis; 110. First frame; 101. Fuel tank; 131. Battery pack; 120. Tray; 121. Tray bracket; 122. Fastener; 130. Battery module; 140. Electronic module; 150. Power distribution box; 160. Fast charging connector; 170. Rear drive connector; 180. Front drive connector; 161. Fast charging cable; 171. Rear drive cable; 1000 Vehicle chassis; 200 Frame assembly; 201 Accommodation area; 202 Inverted triangular area; 203 Through hole; 204 First mounting hole; 210 Front section of frame; 220 Middle section of frame; 221 Side beam; 2211 First longitudinal beam; 2212 Second longitudinal beam; 230 Rear section of frame; 300. Battery pack; 301. Front drive interface; 302. Communication interface; 303. Fast charging interface; 304. Rear drive interface; 305. Electrical box; 306. Front drive wiring harness; 307. Fast charging wiring harness; 310. Housing; 311. Housing cover; 312. Housing crossbeam; 313. Housing longitudinal beam; 314. Battery module; 315. Side bracket; 316. Rear bracket; 317. Third mount; 318. Fourth mounting; 320, Electrical compartment; 321, First electrical compartment; 3211, First mounting; 3212, Second mounting; 322, Second electrical compartment; 400, Base plate; 401, First base plate 401; 402, Second base plate 402; 410, Connecting part; 420, Support part; 421, Second mounting hole; 422, Third mounting hole; 423, Sleeve; 424, Connecting plate; 430, Receiving cavity; 500. Mounting bracket; 510. First bracket; 520. Second bracket; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0022] The embodiments of this application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. "Multiple" means at least two, that is, two or more; "multiple" means at least two, that is, two or more.

[0024] In this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist; for example, a and / or b can represent three cases: a alone, a and b simultaneously, and b alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0027] Please see Figures 1 to 3In the related technology, the chassis 100 has a first frame 110, on which an existing battery module 130 and a fuel tank 101 are mounted. The existing chassis 100 is typically used in hybrid off-road vehicles, and users expect to provide a larger battery capacity and a larger fuel tank 101 to achieve a longer pure electric range and a greater cruising range. The existing battery pack 131 has a tray 120, a battery module 130, an electronic module 140, a power distribution box 150, a fast charging connector 160, a rear-drive connector 170, a front-drive connector 180, and a top cover. Tray brackets 121 on both sides of the tray 120 are connected to the first frame 110, and the battery pack 131 is fixed to the first frame 110 by multiple fasteners 122. The front-drive connector 180 is installed at the front end of the battery pack 131, and the fast charging connector 160 and the rear-drive connector 170 are installed at the rear end of the battery pack 131. The fast-charging connector 160 and the rear-drive connector 170 can only be arranged inside the tray 120, meaning they are relatively far from the first frame 110. As shown in the figure, the fast-charging connector 160 connects to the charging socket via the fast-charging cable 161, and the rear-drive connector 170 connects to the rear-drive motor via the rear-drive cable 171. The fast-charging cable 161 and the rear-drive cable 171 are used to conduct / carry large currents. Their large wire diameter and bending radius mean they occupy a significant amount of space, limiting the width of the fuel tank 101. Since the fast-charging connector 160 and the rear-drive connector 170 cannot be close to the first frame 110, the fuel tank 101 needs to accommodate the assembly space of the fast-charging cable 161 and the rear-drive cable 171, resulting in a smaller fuel tank volume. The fast charging cable 161 and the rear-drive cable 171 occupy space in the fuel tank 101, thereby reducing the volume of the fuel tank 101 and adversely affecting the vehicle's driving range. As shown in the figure, the rear space of the tray 120 is used to accommodate / arrange the electronic module 140 and the power distribution box 150. The front / rear of the tray 120 also requires spare space for assembling the fast charging connector 160, the rear-drive connector 170, and the front-drive connector 180. Therefore, the length of the battery module 130 is limited. Part of the space in the tray 120 is used to arrange accessories, which limits the power capacity of the battery pack 131 and adversely affects the vehicle's pure electric driving range.

[0028] like Figure 1As shown, the side beam section of the first frame 110 has a height of H and a width of L, where L is typically smaller than H, resulting in poor lateral stiffness of the side beam. During a side collision, the side beam of the first frame 110 will bend and compress the battery pack 131. For safety reasons, a large gap is maintained between the battery module 130 and the first frame 110. The width of the first frame 110 and its safety boundaries limit the usable width of the battery module 130, thus limiting the increase in the battery pack's capacity. Other embodiments extend the tray 120 to lengthen the battery module 130, thereby increasing its capacity; however, this also results in a reduction in the length and volume of the fuel tank 101. Limited by the chassis 100 space, achieving a large capacity for the battery pack 131 and a large volume for the fuel tank 101 usually requires trade-offs, and existing technologies limit vehicle performance improvements.

[0029] Based on this, the inventors propose a frame assembly, a vehicle chassis, and a vehicle to at least solve the technical problem in related technologies where the large capacity of the battery pack and the large volume of the fuel tank are difficult to achieve simultaneously due to limitations in chassis space and safety, thus restricting the improvement of vehicle performance.

[0030] Please refer to Figures 4 to 7. This embodiment provides a frame assembly 200, which includes a front frame section 210, a middle frame section 220, and a rear frame section 230. For ease of description, the length direction of the frame assembly 200 is defined as the first direction X, the width of the frame assembly 200 is defined as the second direction Y, and the thickness direction of the frame assembly 200 is defined as the third direction Z. The front frame section 210, the middle frame section 220, and the rear frame section 230 are arranged sequentially along the first direction X. The middle frame section 220 includes side beams 221 spaced apart along the second direction Y, and a front crossbeam and a rear crossbeam spaced apart along the first direction X. The two side beams 221 are fixedly connected at both ends along the first direction X to the rear end of the front frame section 210 and the front end of the rear frame section 230, respectively, forming the longitudinal load-bearing body of the middle frame section 220. The middle section 220 of the frame is also provided with a front crossbeam and a rear crossbeam arranged at intervals along the first direction X. The two ends of the front crossbeam and the rear crossbeam are fixedly connected to the inner side walls of the two side beams 221 respectively. The front crossbeam, the rear crossbeam and the side beams 221 on both sides together form a closed battery enclosure area 201.

[0031] Furthermore, the overall cross-sectional height H2 of the side beam 221 along the vehicle's vertical direction, i.e., the third direction Z, is less than the vertical cross-sectional height H1 of the corresponding longitudinal beams of the front section 210 and the rear section 230 of the frame. A single side beam 221 is composed of a first longitudinal beam 2211 and a second longitudinal beam 2212. The first longitudinal beam 2211 and the second longitudinal beam 2212 can adopt a rectangular tube cross-section structure to adapt to different load-bearing and installation requirements. The first longitudinal beam 2211 and the second longitudinal beam 2212 are arranged side by side along the second direction Y. The second longitudinal beam 2212 is located between the battery enclosure area 201 and the first longitudinal beam 2211. The vertical cross-sectional height of the first longitudinal beam 2211 is greater than the vertical cross-sectional height of the second longitudinal beam 2212. During vehicle operation, the longitudinal load and lateral collision load of the overall frame are mainly borne by the first longitudinal beam 2211, while the second longitudinal beam 2212 serves as an auxiliary load-bearing structure and provides lateral installation limit and protection for the battery pack 300.

[0032] The frame assembly 200 provided in this embodiment is configured as a three-section structure including a front frame section 210, a mid-frame section 220, and a rear frame section 230. In the mid-frame section 220, spaced-apart side beams 221, along with spaced-apart front and rear crossbeams, enclose a battery pack 300 housing area 201, providing a stable mounting base for the battery pack 300. The side beams 221 employ a double-beam structure of a first longitudinal beam 2211 and a second longitudinal beam 2212 arranged along the second direction Y. The second longitudinal beam 2212 is positioned between the housing area 201 and the first longitudinal beam 2211. Simultaneously, the height of the first longitudinal beam 2211 along the third direction Z is greater than that of the second longitudinal beam 2212. The overall height of the side beams 221 in the mid-frame section 220 along the third direction Z is less than that of the front frame section 210 and the rear frame section 230. The higher longitudinal beam height of the first longitudinal beam 2211 allows it to bear the main lateral loads and impact forces of the frame, ensuring the overall structural rigidity and side-impact protection of the frame. This eliminates the need for an excessively large safety clearance between the battery pack 300 and the frame, effectively widening the lateral usable width of the battery pack 300's housing area 201 and providing more space for its arrangement. The overall lower height of the side beams 221 in the middle section of the frame compared to the front and rear longitudinal beams, combined with the lower vertical height of the second longitudinal beam 2212, lowers the mounting reference plane of the battery pack 300, freeing up vertical space under the frame. Simultaneously, the increased lateral space of the battery pack 300 leads to a higher energy capacity, and more longitudinal space is allocated to the fuel tank behind the battery pack 300, increasing the usable volume of the fuel tank and the vehicle's overall cruising range. This allows for the simultaneous realization of the battery pack 300's functionality without altering the overall longitudinal mounting dimensions of the frame. The dual improvements in battery capacity and fuel tank size cater to the needs of off-road vehicles for long range and ability to handle complex road conditions, effectively enhancing the overall performance of the vehicle.

[0033] In some embodiments, referring to Figures 4 to 7, the second longitudinal beam 2212 and the first longitudinal beam 2211 are aligned in the same longitudinal direction, both extending along the first direction X. The longitudinal ends of the second longitudinal beam 2212 are flush with the longitudinal ends of the first longitudinal beam 2211. The bottom surface of the second longitudinal beam 2212 is higher than the bottom surface of the first longitudinal beam 2211 in the third direction Z, forming an inverted triangular cross-sectional area 202 that extends continuously along the first direction X between the bottom wall of the second longitudinal beam 2212 and the inner wall of the first longitudinal beam 2211. The bottom surface of the first longitudinal beam 2211 has multiple through holes 203 spaced apart along the first direction X, and the bottom surface of the second longitudinal beam 2212 also has multiple through holes 203 spaced apart along the first direction X. All through holes 203 are through-hole structures, and the mounting points of the battery pack 300 can be fixedly connected to the bottom surface of the side beam 221 using matching bolts and fasteners. During assembly, the mounting structure of the battery pack 300 can be attached to the bottom surfaces of the first longitudinal beam 2211 and the second longitudinal beam 2212, and locked in place by bolts inserted through the through holes 203. The inverted triangular area 202 can provide sufficient clearance for the installation of the electrical compartment 320.

[0034] In this embodiment, the through holes 203 on the bottom surface of the first longitudinal beam 2211 and the through holes 203 on the bottom surface of the second longitudinal beam 2212 can be arranged in a staggered manner along the first direction X, or they can be arranged in the same row to adapt to different installation point layouts of the battery pack 300. The through holes 203 can be made of smooth material, or internal threads can be machined on the inner wall of the through holes 203 to be used directly as threaded connection holes. Through the height difference design between the bottom surfaces of the second longitudinal beam 2212 and the first longitudinal beam 2211, a continuous inverted triangular avoidance area 202 is formed, which can reduce the operational difficulty when installing the battery pack 300 and the bottom of the side beam 221. The design of setting the connecting through holes 203 on the bottom surfaces of both longitudinal beams can realize multi-point surface contact fixation between the battery pack 300 and the side beam 221, improve the installation stability of the battery pack 300, and avoid the problem of loosening of the installation under off-road bumpy conditions. Meanwhile, the inverted triangular area 202 formed by the height difference can create a buffer energy absorption space during side collisions, further improving the side collision protection performance of the frame and enhancing the safety of the battery pack 300.

[0035] In one example, continuing to refer to Figures 4 through 7, the side beam 221 may include a first side beam and a second side beam (not shown in the figures) on the left and right sides of the frame mid-section 220; the frame mid-section 220 has a front crossbeam and a rear crossbeam. The left and right ends of the front and rear crossbeams are connected to the first and second side beams, which enhance the strength and structural stability of the frame mid-section 220. The first and second side beams have a symmetrical structure; the height of the longitudinal beams on both sides of the frame front section 210 and frame rear section 230 is H1, and the height of the first side beam is H2, where H2 < H1, meaning the height of the first side beam is significantly less than the height of the longitudinal beams on both sides of the frame front section 210 and frame rear section 230. The first side beam has a first longitudinal beam 2211 and a second longitudinal beam 2212, which can be welded together; wherein, the height of the second longitudinal beam 2212 is less than the height of the first longitudinal beam 2211; and the width of the first longitudinal beam 2211 is less than the total width of the first side beam.

[0036] It should be noted that, thanks to the addition of a second longitudinal beam 2212 inside the first longitudinal beam 2211, the width of the first side beam is significantly greater than the width of the longitudinal beams on both sides of the front section 210 and the rear section 230 of the frame. The height of the first side beam and the middle section 220 of the frame is reduced, but thanks to the combination of the first longitudinal beam 2211 and the second longitudinal beam 2212, the lateral stiffness of the first side beam is significantly improved. The reduced height of the middle section 220 allows the remaining space below it to potentially expand the volume of the battery pack 300, thereby increasing its capacity. The increased stiffness / strength of the middle section 220 helps reduce side-impact deformation / intrusion, thus providing a wider safety boundary for the battery pack 300 and further increasing its capacity. Multiple through holes 203 are provided below the first longitudinal beam 2211, and each through hole 203 is correspondingly equipped with a nut above it, which can be used to secure the battery pack 300. The outer side of the first longitudinal beam 2211 is provided with multiple mounting holes, and the inner side of each mounting hole is provided with a nut, which can be used to connect with the base plate 400. The lower part of the second longitudinal beam 2212 is provided with multiple through holes 203, and the upper part of each through hole 203 is provided with a nut, which can be used to fix the battery pack 300.

[0037] Please refer to Figures 8 to 16. This application provides a vehicle chassis 1000, which includes a frame assembly 200 as described in any of the above embodiments, a battery pack 300, at least two floor plates 400, and a mounting bracket 500. The battery pack 300 is mounted on the middle section 220 of the frame assembly 200, and the battery pack 300 is entirely housed within the receiving area 201 formed by the side beam 221 and the crossbeam. The vehicle chassis 1000 is also provided with at least two base plates 400, which are respectively installed on the two side beams 221 of the middle section 220 of the frame. The length direction of the base plates 400 extends along the first direction X. The vehicle chassis 1000 is also provided with mounting brackets 500. Two mounting brackets 500 can be provided. The two mounting brackets 500 are respectively installed on the rear section 230 of the frame near the ends of the two side beams 221. The front end of the mounting bracket 500 extends to the rear crossbeam of the middle section 220 of the frame, and the rear end is fixedly connected to the longitudinal beam of the rear section 230 of the frame. The base plate 400 and the mounting bracket 500 together form the support and fixing system of the battery pack 300. The base plate 400 provides longitudinal main support on both sides of the battery pack 300, and the mounting bracket 500 provides auxiliary support and limit at the rear end of the battery pack 300, firmly fixing the battery pack 300 to the preset installation position in the middle section 220 of the frame.

[0038] It should be noted that the base plate 400 can adopt an L-shaped bending structure, and the connection between the mounting bracket 500 and the rear longitudinal beam and rear cross beam of the frame section 230 can be fixed by splicing with high-strength bolts. The connection between the base plate 400 and the side beam 221 can be fixed by bolt locking, or a composite fixing method combining welding and bolt connection can be used to ensure the connection strength.

[0039] The vehicle chassis 1000 provided in this embodiment forms a multi-point stable support system through the base plate 400 and the mounting bracket 500 set at the rear section 230 of the frame, which firmly limits the installation of the battery pack 300 in the middle section 220 of the frame, ensuring the installation stability and vibration and impact resistance of the battery pack 300 under complex off-road conditions, and adapting to the full-scenario use needs of off-road vehicles. The battery pack 300 incorporates electrical compartments 320 on both sides of the housing 310. These compartments house the electrical box 305 and the battery pack 300 control module. This allows the power distribution and control components that would otherwise occupy the interior space of the housing 310 to be moved to the lateral space outside the housing 310. This frees up the space originally occupied by the electrical modules inside the housing 310, increasing the available volume of the battery modules 314 within the housing 310. As a result, more battery modules can be installed within the same housing 310 dimensions, effectively improving the battery pack 300's energy reserves and the vehicle's pure electric range. The longitudinal ends of the electrical compartment 320 and the longitudinal ends of the housing 310 are staggered, providing ample operating space for the installation of the fast charging interface 303 and the rear drive interface 304 at the longitudinal ends of the battery pack 300, as well as for the laying of the corresponding large-diameter high-voltage cables. This eliminates the need to occupy additional longitudinal space behind the battery pack 300, avoiding the compression of the fuel tank's usable volume caused by the bending radius requirements of the high-voltage cables. Within the fixed longitudinal length of the vehicle frame, more space is reserved for the fuel tank, achieving a simultaneous increase in fuel tank volume. Without sacrificing vehicle collision safety performance and off-road capability, a longer pure electric driving range is simultaneously achieved, improving the overall performance of the vehicle.

[0040] In some embodiments, referring to Figures 9 to 11, the battery pack 300 includes a housing 310, which houses multiple battery modules 314 connected in series or parallel. The housing 310 has independent electrical compartments 320 on its left and right end faces in the second direction Y. The two electrical compartments 320 are symmetrically distributed on the lateral sides of the housing 310, forming a closed storage space for the centralized placement of structural components such as the electrical box 305 and the battery pack 300 control module. The longitudinal ends of the electrical compartments 320 extend forward and backward along the first direction X, respectively. The total length of the electrical compartments 320 along the first direction X is less than the total longitudinal length of the housing 310 and also less than the total longitudinal length of the side beam 221, creating a predetermined misalignment between the longitudinal ends of the electrical compartments 320 and the longitudinal front and rear end faces of the housing 310. The enclosure 310 is also provided with at least one crossbeam 312 and at least one longitudinal beam 313. The crossbeam 312 extends along the second direction Y and extends towards the electrical compartments 320 on both sides of the enclosure 310. The longitudinal beam 313 extends along the first direction X. The longitudinal beam 313 and the crossbeam 312 are intersected and fixedly connected to each other to form a reinforcing frame inside the enclosure 310.

[0041] It should be noted that the enclosure 310 may include a detachable cover 311. The electrical compartment 320 and the enclosure 310 may be of a separate structure, fixed to the transverse side wall of the enclosure 310 by bolts and seals. The transverse beams 312 and longitudinal beams 313 inside the enclosure 310 may be configured as a cross-shaped intersecting structure or a grid-shaped multi-beam and multi-longitudinal beam intersecting structure, the number of which may be adjusted according to the size of the enclosure 310 and the load-bearing requirements.

[0042] In this embodiment, by setting the electrical compartment 320 on the end faces of the two lateral sides of the housing 310, the power distribution and control components that originally occupied the internal space of the housing 310 can be completely transferred to the lateral space outside the housing 310. This frees up the arrangement space inside the housing 310 that was originally occupied by the electrical modules, increases the arrangeable volume of the battery module 314 inside the housing 310, and allows more battery modules to be installed within the same housing 310 external dimensions, effectively improving the energy storage of the battery pack 300 and the pure electric range of the vehicle.

[0043] Meanwhile, the design that the length of the electrical compartment 320 is less than the length of the housing 310 and the side beam 221 allows the longitudinal ends of the electrical compartment 320 to be staggered with the longitudinal ends of the housing 310. This provides sufficient operating space for the installation of the fast charging interface 303 and the rear drive interface 304 at the longitudinal ends of the battery pack 300, as well as for the laying and bending of the corresponding large-diameter high-voltage cables. It does not require additional longitudinal arrangement space behind the battery pack 300, and avoids the compression of the available fuel tank volume caused by the bending radius requirements of the high-voltage cables. Within the fixed longitudinal length of the vehicle frame, more arrangement space is reserved for the fuel tank, achieving a synchronous increase in fuel tank volume. The crossbeams and longitudinal beams inside the housing 310 improve the structural rigidity and impact resistance of the battery pack 300 housing 310 itself. Combined with the double longitudinal beam structure of the mid-section of the frame 220, the side collision protection performance of the battery pack 300 is further enhanced. There is no need to reserve an excessively large safety gap between the battery pack 300 and the frame, which further widens the lateral usable width of the battery pack 300 and realizes the increase of the battery pack 300's capacity.

[0044] In one example, referring to Figures 9 to 11, the electrical compartment 320 includes a first electrical compartment 321 and a second electrical compartment 322 respectively disposed on both sides of the housing 310. The first electrical compartment 321 and the second electrical compartment 322 can accommodate the electrical box 305 and the control module. The first electrical compartment 321 is sealed by a first cover plate, and the second electrical compartment 322 is sealed by a second cover plate. Multiple battery modules 314 are installed inside the housing 310. The housing crossbeam 312 abuts against the first electrical compartment 321 and the second electrical compartment 322 on both sides. The housing crossbeam 312 can limit the inward displacement of the first electrical compartment 321 and the second electrical compartment 322 under side impact / squeezing conditions, thereby preventing mechanical damage to the battery modules 314. The housing crossbeam 312 can improve side impact safety and provide a wider arrangement boundary for the battery modules 314, thereby improving the power capacity and safety of the battery pack 300.

[0045] In some embodiments, please refer to Figures 9 to 11. The housing 310 has multiple side supports 315 fixed to the left and right end faces of the electrical compartment 320, respectively. The multiple side supports 315 are arranged at intervals along the first direction X. The top surface of the electrical compartment 320 is fixed with multiple first mounts 3211 and multiple second mounts 3212. The first mounts 3211 and second mounts 3212 are arranged staggered left and right along the second direction Y. The second mounts 3212 are located on the side of the electrical compartment 320 closest to the side supports 315, and the first mounts 3211 are located on the side of the electrical compartment 320 furthest from the side supports 315. After the battery pack 300 is assembled with the frame assembly 200, the top contact surface of the first mount 3211 is tightly fitted with the bottom end face of the first longitudinal beam 2211 and fixedly connected by fasteners; the top contact surfaces of the side bracket 315 and the second mount 3212 are also tightly fitted with the bottom end face of the second longitudinal beam 2212 and fixedly connected by fasteners. After assembly, at least a portion of the electrical compartment 320 is located directly below the side beam 221, embedded in the mounting space at the bottom of the side beam 221.

[0046] It should be noted that the number of the first mounting bracket 3211, the second mounting bracket 3212, and the side bracket 315 can be adjusted according to the weight of the battery pack 300 and the installation requirements. The three can be arranged in a staggered manner along the first direction X, or they can be arranged in the same row. This embodiment, through the staggered arrangement of the first mounting bracket 3211, the second mounting bracket 3212, and the side bracket 315, achieves multi-point staggered fixing of the battery pack 300 to the first longitudinal beam 2211 and the second longitudinal beam 2212, improving the structural stability of the connection between the battery pack 300 and the vehicle frame, dispersing the concentrated load at the connection points, and avoiding the problem of overload breakage at a single mounting point. The design of the electrical compartment 320, which is at least partially embedded in the area below the side beam 221, makes full use of the unused vertical space at the bottom of the side beam 221. This eliminates the need to occupy the lateral width of the battery pack 300 housing area 201, further expanding the usable lateral space inside the housing 310. Simultaneously, it reduces the overall vertical installation height of the battery pack 300, improving the vehicle's chassis passability and adapting to the complex road conditions required for off-road vehicles. The staggered dual-mount structure evenly distributes the load of the battery pack 300 to the first longitudinal beam 2211 and the second longitudinal beam 2212, leveraging the structural advantages of the dual longitudinal beams' graded load-bearing capacity. This avoids the problem of concentrated load deformation on a single longitudinal beam, further improving the load-bearing stability and service life of the frame assembly 200.

[0047] In some embodiments, referring to Figures 3, 12 to 16, the outer wall of the first longitudinal beam 2211, facing away from the second longitudinal beam 2212, has a plurality of through-holes 204 spaced apart along the first direction X. The base plate 400 is divided into two parts: a connecting part 410 and a supporting part 420. The connecting part 410 and the supporting part 420 are integrally formed continuous structures. The plane where the supporting part 420 is located intersects the plane where the connecting part 410 is located at a predetermined angle, forming an L-shaped main structure. At least a portion of the structure of the connecting part 410 is attached to the outer end face of the first longitudinal beam 2211. The connecting part 410 is locked and fixed to the outer wall of the first longitudinal beam 2211 by fasteners inserted into the first mounting holes 204. After the base plate 400 is assembled with the first longitudinal beam 2211, the support part 420 is located below the bottom surface of the side beam 221. A closed receiving cavity 430 is formed between the upper surface of the support part 420 and the bottom surface of the side beam 221. The receiving cavity 430 is used to accommodate part of the structure of the electrical compartment 320. The side of the receiving cavity 430 facing the battery pack 300 receiving area 201 is open. The electrical compartment 320 can be embedded into the receiving cavity 430 through this opening.

[0048] It should be noted that the included angle between the connecting part 410 and the supporting part 420 can be set to 90°, or it can be set to any angle between 75° and 105° depending on the shape of the electrical compartment 320, to adapt to different installation requirements; the first mounting hole 204 can be a smooth hole structure, or internal threads can be machined on the hole wall to be used directly as a threaded connection hole; the base plate 400 can be made of high-strength steel plate by integral stamping and bending, or it can be made of aluminum alloy profile by integral extrusion, so as to achieve lightweight design while ensuring structural strength.

[0049] In this embodiment, through the integrated structural design of the base plate 400, and in conjunction with the first mounting hole 204 on the outer wall of the first longitudinal beam 2211, the base plate 400 can be firmly fixed to the outer side of the first longitudinal beam 2211. At the same time, a dedicated electrical compartment 320 receiving cavity 430 is formed at the bottom of the side beam 221. The idle space on the outer side of the first longitudinal beam 2211 and the bottom of the side beam 221 is fully utilized, and the electrical compartment 320 is completely embedded in the receiving cavity 430. There is no need to occupy the lateral space of the battery pack 300 receiving area 201. This further expands the lateral arrangement space of the battery module 314 inside the housing 310 and improves the power reserve of the battery pack 300. The design of the cavity 430 opening towards the receiving area 201 allows for the embedded installation of the electrical compartment 320, providing all-round protection for the electrical compartment 320 and preventing impact or corrosion from stones and mud splashed during vehicle operation, thereby improving the safety and service life of the electrical compartment 320.

[0050] In some embodiments, referring to Figures 13 and 14, the support portion 420 of the base plate 400 is provided with a plurality of second mounting holes 421, a plurality of third mounting holes 422, and at least one sleeve 423 offset along the first direction X. The second mounting holes 421 are through-hole structures, used to fix the side wall of the housing 310 to the support portion 420 by fasteners; the third mounting holes 422 are through-hole structures, and their positions correspond to the mounting points of the first mount 3211, used to fix the first mount 3211 to the support portion 420 by fasteners; the sleeve 423 extends vertically, the top end of the sleeve 423 is fitted and fixed to the bottom surface of the first longitudinal beam 2211, and the bottom end of the sleeve 423 is fixedly connected to the upper surface of the support portion 420. A connecting plate 424 is fixedly installed on the outer wall of the sleeve 423. The other end of the connecting plate 424 is fixedly connected to the connecting part 410 of the base plate 400, forming a continuous reinforced structure of sleeve 423, connecting plate 424, connecting part 410 and support part 420.

[0051] It should be noted that the second mounting hole 421 and the third mounting hole 422 can be arranged in a staggered manner along the first direction X, or they can be arranged in multiple parallel rows to adapt to different mounting point layouts. The connection between the sleeve 423 and the support part 420 and the connecting plate 424 can be fixed by welding; the connecting plate 424 can be set as a triangular reinforcing rib structure to further strengthen the structural rigidity between the connecting part 410 and the support part 420. In this embodiment, through the staggered second mounting hole 421 and the third mounting hole 422 on the support part 420, multiple fixed connections can be simultaneously realized between the base plate 400 and the box 310 and the first mount 3211, forming a continuous fixed whole between the box 310 and the electrical compartment 320 mount structure of the battery pack 300 and the base plate 400, improving the structural integrity and vibration resistance of the battery pack 300 installation, and avoiding relative displacement of different mounting points under bumpy conditions. The reinforced structural design of the sleeve 423 and the connecting plate 424 can form a rigid support between the support part 420 and the first longitudinal beam 2211, improve the load-bearing capacity of the base plate 400, and prevent the support part 420 from bending and deforming under the load of the battery pack 300. At the same time, the connecting plate 424 can further strengthen the structural strength between the connecting part 410 and the support part 420, improve the impact resistance of the base plate 400, and ensure the installation stability and safety of the battery pack 300 under complex off-road conditions.

[0052] In some embodiments, referring to Figure 15, the receiving cavity 430 formed between the bottom plate 400 and the bottom surface of the side beam 221 has a total length along the first direction X greater than the total length of the electrical compartment 320 along the first direction X. The longitudinal front and rear ends of the receiving cavity 430 extend beyond the longitudinal front and rear ends of the electrical compartment 320, forming a reserved space of a predetermined length. After the electrical compartment 320 is fully embedded inside the receiving cavity 430, corresponding clearance gaps are maintained between the longitudinal front and rear ends of the electrical compartment 320 and the longitudinal front and rear inner walls of the receiving cavity 430.

[0053] Specifically, the longitudinal length of the receiving cavity 430 can be adjusted according to the length of the electrical compartment 320. The reserved length of the receiving cavity 430 beyond both ends of the electrical compartment 320 can be set according to specific circumstances to adapt to different installation and wiring harness layout requirements. The front and rear ends of the receiving cavity 430 can remain open to provide a routing channel for the high-voltage wiring harness. In this embodiment, by designing the length of the receiving cavity 430 to be greater than the length of the electrical compartment 320, sufficient clearance space can be reserved at both ends of the electrical compartment 320, providing ample operating space for the layout and bending of the high-voltage and low-voltage wiring harnesses led out of the electrical compartment 320, avoiding interference between the wiring harness and the inner wall of the receiving cavity 430 during bending, and meeting the minimum bending radius requirement of large-diameter high-voltage cables. It does not require additional longitudinal arrangement space at the front and rear ends of the battery pack 300, further freeing up usable longitudinal space in the vehicle frame and providing a basis for increasing the fuel tank volume.

[0054] In some embodiments, referring to Figures 9 and 16, the housing 310 is located near the rear end face of the rear section 230 of the frame, with a third mount 317 and a fourth mount 318 fixedly installed on its left and right sides, respectively. The positions of the third mount 317 and the fourth mount 318 correspond one-to-one with the two mounting brackets 500 of the rear section 230 of the frame. The front ends of the two mounting brackets 500 are fixedly connected to the third mount 317 and the fourth mount 318, respectively. The mounting brackets 500 extend backward along the first direction X away from the rear end of the corresponding mount, pass through the bottom of the rear crossbeam, and are fixedly connected to the bottom end face of the longitudinal beam of the rear section 230 of the frame, so that the mounting brackets 500 form a continuous longitudinal force transmission structure, directly transferring the load at the rear end of the battery pack 300 to the longitudinal beam of the rear section 230 of the frame.

[0055] In this embodiment, through the corresponding connection between the third and fourth mounting brackets on the rear end face of the housing 310 and the mounting bracket 500, and in conjunction with the force transmission structure of the mounting bracket 500 extending to the longitudinal beam of the rear section 230 of the frame, the load at the rear end of the battery pack 300 can be directly transferred to the longitudinal beam of the rear section 230 of the frame. This avoids the load at the rear end of the battery pack 300 being concentrated entirely on the rear crossbeam, thus improving the load-bearing capacity and structural stability of the middle section 220 of the frame. Simultaneously, the design of the mounting bracket 500 extending from the bottom of the rear crossbeam fully utilizes the unused vertical space at the bottom of the rear crossbeam, without requiring additional longitudinal space behind the battery pack 300, thus avoiding encroachment on the fuel tank's placement space and ensuring room for increasing fuel tank volume. This structure strengthens the installation limit at the rear end of the battery pack 300, improving the installation stability and operational safety of the battery pack 300.

[0056] In one example, referring to Figures 9 through 16, the front end of the housing 310 is provided with multiple front-end supports, and multiple side supports 315 are provided on both sides of the housing 310; the first electrical compartment 321 and the second electrical compartment 322 are provided with multiple first mounts 3211 and second mounts 3212; the rear end of the housing 310 may be provided with multiple rear end supports 316, and the rear end of the housing 310 is provided with a third mount 317 and a fourth mount 318, each of which has multiple threaded holes. Multiple bottom plate supports are provided on both sides of the housing 310. The first electrical compartment 321 protrudes from the left side of the housing 310, and the second electrical compartment 322 protrudes from the right side of the housing 310. The first electrical compartment 321 has a communication interface 302 installed at its front end and a rear drive interface 304 installed at its rear end. The second electrical compartment 322 has a front drive interface 301 installed at its front end and a fast charging interface 303 installed at its rear end. The space inside the housing 310 is typically used to house the battery module 314, the electrical box 305, and necessary wiring and control modules. With less space occupied by the electrical box 305 and control modules, the battery module 314 can occupy more space, thus accommodating / arranging a larger amount of power. The housing 310 has a first electrical compartment 321 and a second electrical compartment 322 protruding from the main structure on both sides. The electrical box 305 and the control module are arranged in the first electrical compartment 321 and the second electrical compartment 322. The front drive interface 301, the communication interface 302, the fast charging interface 303, and the rear drive interface 304 are distributed on the front and rear end faces of the first electrical compartment 321 and the second electrical compartment 322. The advantage of this is that the space inside the housing 310 is used to accommodate the battery module 314 in the largest proportion.

[0057] In one example, such as Figure 8As shown in Figure 14, the first base plate 401 is approximately L-shaped. The first base plate 401 has a vertical surface, a bottom surface, a front wing surface, and a rear wing surface, with the vertical surface and bottom surface being approximately perpendicular. The first base plate 401 has multiple sleeves 423 perpendicular to the bottom surface. The sleeves 423 are connected to the vertical surface via connecting plates 424, and the sleeves 423 and connecting plates 424 reinforce the first base plate 401. The sleeves 423 have mounting holes, with a sixth mounting hole communicating with the bottom surface. The bottom surface and vertical surface have multiple mounting holes; the front wing surface of the first base plate 401 has multiple mounting holes, and the rear wing surface of the first base plate 401 has multiple mounting holes. Preferably, the vertical surface and bottom surface each have multiple reinforcing ribs. The structure of the second base plate 402 is symmetrical to that of the first base plate 401, and the shapes of the first base plate 401 and the second base plate 402 match the vehicle frame and battery pack 300. The upper surface is fitted to the side of the middle section 220 of the frame, and the mounting holes are matched with nuts for connection; the front wing is fitted to the front section 210 of the frame, and the corresponding mounting holes are matched with the first mounting part for connection; the rear wing is fitted to the rear section 230 of the frame, and the corresponding mounting holes are matched with the second mounting part for connection; the bottom surface is fitted to the housing 310, and the corresponding mounting holes are matched with the first mount 3211 for connection; the sleeve 423 is fitted to the first longitudinal beam 2211 of the middle section 220 of the frame, and the corresponding mounting holes are matched with nuts for connection. The connection method of the second base plate 402 to the frame and the battery pack 300 is similar to that of the first base plate 401.

[0058] Specifically, please refer to Figures 8 to 16. During the assembly process, the battery pack 300 is assembled onto the mid-section 220 of the frame; the front bracket is fitted against the front crossbeam and connected to the front crossbeam by multiple bolts. The first mount 3211 is fitted against the lower surface of the first longitudinal beam 2211, but the connection between the first mount 3211 and the first longitudinal beam 2211 is not yet secure. The side bracket 315 is fitted against the lower surface of the second longitudinal beam 2212 and connected to the second longitudinal beam 2212 by multiple bolts and nuts. The second mount 3212 is fitted against the lower surface of the second longitudinal beam 2212 and connected to the second longitudinal beam 2212 by multiple bolts and nuts. The rear bracket 316 is fitted against the rear crossbeam and connected to the rear crossbeam by multiple bolts. The battery pack 300 has been secured to the mid-section 220 of the frame.

[0059] Furthermore, a bracket 500 is installed at the rear of the battery pack 300; a first bracket 510 connects the third mount 317 to the rear section 230 of the frame, and a second bracket 520 connects the fourth mount 318 to the rear section 230 of the frame. The first bracket 510 is connected to the third mount 317 by multiple bolts, and the second bracket 520 is connected to the fourth mount 318 by multiple bolts, and the second bracket 520 is connected to the rear section 230 of the frame. Install the front drive harness 306 and connect it to the front drive interface 301 of the battery pack 300. The other end of the front drive harness 306 can be connected to the front drive motor. Install the fast charging harness 307 and connect it to the fast charging interface 303 of the battery pack 300. The other end of the fast charging harness 307 can be connected to the fast charging socket. Install the rear drive harness and connect it to the rear drive interface 304 of the battery pack 300. The other end of the rear drive harness can be connected to the rear drive motor. Furthermore, the communication interface 302 of the low-voltage wiring harness of the vehicle and the battery pack 300 is connected. The fast charging wiring harness 307 extends beyond the rear end of the battery pack 300, and can be arranged close to / close to the rear section 230 of the frame; the rear-drive wiring harness extends beyond the rear end of the battery pack 300, and can also be arranged close to / close to the rear section 230 of the frame. The fast charging wiring harness 307 and the rear-drive wiring harness are arranged close to the longitudinal beams on both sides of the rear section 230 of the frame, and the fuel tank is arranged behind the rear crossbeam. The fast charging wiring harness 307 and the rear-drive wiring harness can reduce the space occupied by the fuel tank, thereby increasing the volume of the fuel tank. The fast charging port 303 is located on the rear end face of the second electrical compartment 322, and the rear drive port 304 is located on the rear end face of the first electrical compartment 321. Compared with the scheme where the fast charging port 303 and the rear drive port 304 are located at the rear end of the housing 310, this arrangement can reduce the encroachment of the fast charging harness 307 and the rear drive harness on the fuel tank layout space. In other words, the fuel tank can be placed closer to the rear end of the housing 310, and the shape of the fuel tank can be more regular, thereby increasing the volume of the fuel tank and increasing the vehicle's fuel driving range.

[0060] Furthermore, the first base plate 401 and the second base plate 402 are installed; the bottom surface is fitted with the housing 310, the second mounting hole 421 is matched and connected with the first mount 3211, the fifth bolt passes through the second mounting hole 421, the first mount 3211 engages with the nut, and the bottom surface, housing 310 and first longitudinal beam 2211 are connected by multiple bolts. The sleeve 423 is fitted with the first longitudinal beam 2211 of the frame middle section 220, and the sixth mounting hole is matched and connected with the nut. The first base plate 401 and the first longitudinal beam 2211 are connected by multiple bolts passing through the sleeve 423. The first mounting hole 204 is matched and connected with the base plate bracket; the bottom surface is connected with the housing 310 by multiple sixth bolts. The vertical surface of the base plate 400 is fitted with the side surface of the frame middle section 220, the mounting hole is matched and connected with the nut; the vertical surface is connected with the first longitudinal beam 2211 by multiple bolts. The front wing surface is fitted to the front section 210 of the frame, and the mounting holes are matched and connected to the first mounting part; the front wing surface is connected to the front section 210 of the frame by multiple bolts. The rear wing surface is fitted to the rear section 230 of the frame, and the mounting holes are matched and connected to the second mounting part; the rear wing surface is connected to the rear section 230 of the frame by multiple bolts. The connection method of the second base plate 402 to the frame and the battery pack 300 is similar to that of the first base plate 401. After assembly, the bottom surface of the first base plate 401 is flush with the bottom of the housing 310, and the vertical surface is fitted to the outer side of the first longitudinal beam 2211, extending to the front section 210 and the rear section 230 of the frame. The base plate 400 is mechanically connected to the housing 310 and the frame. The first base plate 401 and the second electrical compartment 322 together form part of the frame mid-section 220b, while the second base plate 402 and the first electrical compartment 321 together form part of the frame mid-section 220. The first base plate 401 raises and reinforces the frame mid-section 220, improving its load-bearing capacity. The control board or BMS component is arranged in the first electrical compartment 321, and the electrical box 305 is arranged in the second electrical compartment 322. The battery pack 300 is integrally embedded inside the frame. The first electrical compartment 321 and the second electrical compartment 322 make full use of the space under the first and second side beams, reducing the space occupied by the control board or BMS component and the electrical box 305 on the battery module 314a.On the other hand, the widened first and second side beams are integrated with the first electrical compartment 321 and the second electrical compartment 322 below them and the bottom plate 400, which greatly improves the strength of the middle section 220b of the frame and reduces the bending deformation of the first and second side beams under side collision conditions. Furthermore, the two ends of the box crossbeam 312 abut against the first electrical compartment 321 and the second electrical compartment 322 respectively. The box crossbeam 312 can limit the first electrical compartment 321 and the second electrical compartment 322 from shifting inward under side collision conditions, thereby preventing mechanical damage to the battery module 314. The battery pack 300 is connected to the first longitudinal beam 2211 and the second longitudinal beam 2212 respectively by two rows of staggered bolts. That is, the area near the battery module 314a is connected to the second longitudinal beam 2212 by second bolts, and the area away from the battery module 314a is connected to the first longitudinal beam 2211 by fifth bolts. Multiple second bolts form a row of fixing points on the second longitudinal beam 2212, and multiple fifth bolts form a row of fixing points on the first longitudinal beam 2211. The two rows of bolts improve the connection rigidity between the housing 310 and the first and second side beams. Under collision conditions, the connection of the two rows of fixing points can better disperse the collision force on the first or second side beam, better resist collision deformation, reduce the deformation of the housing 310, and protect the battery module 314a.

[0061] With this configuration, the battery module 314 can be positioned closer to the first and second side beams of the mid-section 220 of the vehicle frame. On the one hand, while meeting assembly clearance requirements, the housing 310 can be widened as much as possible between the first and second side beams; on the other hand, the space within the housing 310 can be used to accommodate the battery module 314 in the largest proportion. It is known that the volume of the battery module 314 is proportional to its capacity, thus maximizing the capacity of the battery pack 300, i.e., maximizing the vehicle's pure electric range. The front end of the base plate 400 is connected to the front section 210 of the frame, the middle section of the base plate 400 is connected to the middle section 220 of the frame, and the rear end of the base plate 400 is connected to the rear section 230 of the frame. The base plate 400 plays a role in dispersing stress in the transition area between the front section 210 and the middle section 220 of the frame, and in the transition area between the middle section 220 and the rear section 230 of the frame. The base plate 400 can enhance the rigidity and load-bearing capacity of the frame. The base plate 400 also serves as a bottom protection plate for the battery pack 300. The first base plate 401 and the second base plate 402 respectively cover the front drive wiring harness 306, the fast charging wiring harness 307, the rear drive wiring harness, and the vehicle low-voltage wiring harness from the bottom, preventing the above wiring harnesses / battery from being scratched or damaged by road obstacles.

[0062] Optionally, the first base plate 401 can be removed from the frame assembly 200 to perform maintenance work on the second electrical compartment 322, the front drive wiring harness 306, and the fast charging wiring harness 307. When the fuse inside the electrical box 305 is damaged, the second cover sealing the second electrical compartment 322 needs to be removed to expose the electrical box 305 for maintenance. The second electrical compartment 322 is located below the second side beam, and the removal of the second cover and the electrical box 305 is not obstructed by the second side beam. Therefore, the battery pack 300 does not need to be removed from the frame to complete the maintenance operation, making maintenance more convenient. Reducing the disassembly and assembly scope can reduce maintenance time and costs. After removing the first base plate 401, the second electrical compartment 322 is still connected to the second longitudinal beam 2212 by multiple bolts, and the connection between the battery pack 300 and the frame remains firm, so there is no risk of the battery pack 300 loosening or falling off.

[0063] In some embodiments, a vehicle is also provided, the vehicle comprising a vehicle chassis as described in any of the preceding embodiments.

[0064] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0066] Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The reference to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily indicate the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0067] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle frame assembly, characterized in that, It includes a front section of the frame, a middle section of the frame, and a rear section of the frame arranged sequentially along the first direction; The vehicle frame includes side beams spaced apart along a second direction, and front and rear crossbeams spaced apart along a first direction. The two ends of the side beams are respectively connected to the front and rear sections of the vehicle frame. The two ends of the front and rear crossbeams are respectively connected to the two side beams to enclose and form a battery pack accommodating area. Wherein, the height of the side beam along the third direction is less than the height of the longitudinal beams of the front section and the rear section of the frame; the side beam includes a first longitudinal beam and a second longitudinal beam, the first longitudinal beam and the second longitudinal beam are arranged along the second direction, the second longitudinal beam is located between the placement area and the first longitudinal beam, and the height of the first longitudinal beam along the third direction is greater than that of the second longitudinal beam.

2. The frame assembly according to claim 1, characterized in that, The second longitudinal beam is in the same length direction as the first longitudinal beam. The bottom surface of the second longitudinal beam is higher than the bottom surface of the first longitudinal beam in the third direction to form an inverted triangular area. Several through holes are opened on the bottom surfaces of the second longitudinal beam and the first longitudinal beam, respectively. The through holes are used for connecting and fixing the battery pack.

3. A vehicle chassis, characterized in that, include: The frame assembly as described in any one of claims 1-2; The battery pack is installed in the middle section of the frame of the frame assembly; At least two base plates are installed on the two side beams respectively, and their length extends along the first direction; as well as Mounting brackets are respectively disposed at the ends of the rear section of the vehicle frame near the two side beams, wherein the base plate and the mounting brackets are used for supporting and fixing the battery pack.

4. The vehicle chassis according to claim 3, characterized in that, The battery pack includes a housing, a battery module disposed within the housing, and electrical compartments disposed on both ends of the housing in the second direction. The electrical compartments are used to accommodate an electrical box and a battery pack control module. Wherein, the two ends of the electrical compartment extend along the first direction respectively, and the length of the electrical compartment along the first direction is less than the length of the box body and the side beam; at least one box body cross beam and one box body longitudinal beam are provided in the box body, the two ends of the box body cross beam extend toward the two electrical compartments respectively, and the box body longitudinal beam and the box body cross beam are arranged to intersect each other.

5. The vehicle chassis according to claim 4, characterized in that, The enclosure has multiple side supports on both sides where the electrical compartment is located; the top surface of the electrical compartment has multiple first and second mounts, wherein the first mounts and the second mounts are staggered in the second direction, and the second mounts are located on the side of the electrical compartment closer to the side supports; Wherein, after the battery pack is installed on the vehicle frame assembly, the first mount is fixedly connected to the bottom end face of the first longitudinal beam, and the side bracket and the second mount are fixedly connected to the bottom end face of the second longitudinal beam, so that the electrical compartment is at least partially located in the area below the side beam.

6. The vehicle chassis according to claim 5, characterized in that, A number of first mounting holes are opened on the outer side of the first longitudinal beam away from the second longitudinal beam; The base plate includes a connecting part and a support part integrally formed with the connecting part. The plane where the support part is located intersects the plane where the connecting part is located. At least a portion of the connecting part is fixedly connected to the outer end face of the first longitudinal beam through the first mounting hole. When the base plate is installed on the first longitudinal beam, a receiving cavity for accommodating the electrical compartment is formed between the support part and the bottom surface of the side beam, and the receiving cavity is set to open towards the accommodating area.

7. The vehicle chassis according to claim 6, characterized in that, The support portion is provided with a second mounting hole for connecting to the box body, a third mounting hole for connecting to the first mount, and at least one sleeve for connecting to the first longitudinal beam; a connecting plate for connecting the connecting portion is fixedly provided on the sleeve.

8. The vehicle chassis according to claim 6, characterized in that, The length of the receiving cavity along the first direction is greater than the length of the electrical compartment.

9. The vehicle chassis according to claim 3, characterized in that, The end face of the housing near the rear section of the frame is respectively provided with a third mount and a fourth mount connected to the two brackets. The end of the two mounting brackets opposite to the third mount and the fourth mount extends from the bottom of the rear crossbeam to be fixedly connected to the longitudinal beam of the rear section of the frame.

10. A vehicle, characterized in that, The vehicle includes a vehicle chassis as described in any one of claims 1-7.

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