Chassis and vehicle

Abstract

The utility model provides a chassis and a vehicle. The chassis comprises a lower vehicle body and a battery cell. The lower vehicle body comprises a floor and a frame extending in the circumferential direction of the floor, the floor and the frame are integrally formed, and a containing cavity is defined by the frame and the floor. And the battery monomers are accommodated in the accommodating cavities. According to the technical scheme, the floor and the frame which form the accommodating cavity are integrally formed, so that when the chassis is assembled, a plurality of battery monomers can be directly arranged in the accommodating cavity formed by enclosing the floor and the frame, and a plurality of steps of welding, riveting and the like are not needed to form the battery box body, so that the production process can be simplified, and the production efficiency can be improved.

Description

Technical Field

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

[0002] Batteries are widely used in vehicles to provide them with electric power.

[0003] In existing technologies, when installing batteries in vehicles, individual battery cells need to be installed into a battery box to form a battery pack, and then the battery pack is installed into the lower body of the vehicle. This makes the vehicle manufacturing process very complicated and reduces production efficiency. Utility Model Content

[0004] In view of the above problems, this application provides a chassis and vehicle to improve production efficiency.

[0005] In a first aspect, this application provides a chassis including a lower body and battery cells. The lower body includes a floor and a frame extending circumferentially from the floor. The floor and the frame are integrally formed, and the frame and the floor enclose a receiving cavity. The battery cells are housed and placed within the receiving cavity.

[0006] In the technical solution of this application embodiment, the floor and frame forming the receiving cavity are integrally molded. In this way, when assembling the chassis, multiple battery cells can be directly installed into the receiving cavity formed by the floor and frame, without the need for multiple steps such as welding and riveting to form the battery box. Therefore, the production process can be simplified and the production efficiency can be improved.

[0007] In some embodiments, the floor and frame are integrally formed by die casting. In this embodiment, the chassis floor and frame are integrally formed by die casting, meaning that an integrated die casting process is used to manufacture the floor and frame as a single piece. This makes the lower body of this embodiment a single casting, which, compared to the prior art where various structures of the lower body need to be connected by welding, riveting, etc., reduces the number of welding or riveting points, thus improving the overall strength and rigidity of the lower body. The integral molding of the floor and frame, and the floor and frame forming a cavity, not only reduces the number of welding or riveting points but also eliminates the bonding areas of structural adhesives and sealants. This reduces safety issues such as water ingress, short circuits, and leaks caused by poor sealing after battery cell assembly, thereby improving the safety of the chassis.

[0008] In some embodiments, the frame includes two sill beams disposed opposite each other.

[0009] When a vehicle is subjected to a side impact, the impact load on the sill beam will be transferred along the sill beam to other integrally formed structures, thereby dispersing the load. In this embodiment, the sill beam and the floor are integrally die-cast, reducing the number of welding points and riveting points and other connection points inside the sill beam (which are easy to become weak points on the path of impact load transfer), thereby improving the impact energy absorption performance of the chassis.

[0010] In some embodiments, the threshold beam includes a first vertical plate and a second vertical plate disposed opposite to each other, and a first horizontal plate disposed between the first vertical plate and the second vertical plate. The first horizontal plate divides the space between the first vertical plate and the second vertical plate into two first cavities located on the upper and lower sides of the first horizontal plate, respectively.

[0011] The sill beam in this embodiment has two first cavities inside. When the sill beam is impacted, the two first cavities respectively form energy-absorbing cavities, thereby absorbing and dispersing the impact energy. Moreover, the sill beam in this embodiment includes a first vertical plate, a second vertical plate, and a first horizontal plate. Therefore, the various structures of the sill beam are generally planar plate structures, which makes it easier to form using an integral die-casting process.

[0012] In some embodiments, the sill beam further includes a plurality of first reinforcing plates disposed within a first cavity, wherein each of the plurality of first reinforcing plates has its two ends connected to a first vertical plate and a second vertical plate, respectively. The plurality of first reinforcing plates disposed within the first cavity thereby improve the strength of the sill beam and optimize the chassis's collision resistance performance.

[0013] In some embodiments, each first reinforcing plate is inclined relative to the first vertical plate, and the ends of two adjacent first reinforcing plates are connected at one point to form a triangle. In the first cavity, the multiple first reinforcing plates are interconnected to form multiple triangular sub-cavities within the first cavity, thus providing energy-absorbing cavities along the entire extension direction of the sill beam, thereby expanding the impact resistance range of the sill beam.

[0014] In some embodiments, the sill beam further includes a third vertical plate disposed opposite to the second vertical plate and disposed on the side of the second vertical plate away from the first vertical plate, and a second transverse plate disposed between the second vertical plate and the third vertical plate, the second transverse plate dividing the space between the second vertical plate and the third vertical plate into two second cavities.

[0015] In this embodiment, the sill beam forms a second cavity by setting a second vertical plate opposite to the second vertical plate on the outside of the second vertical plate. This makes the second cavity near the outer side of the lower vehicle body serve as an energy absorption cavity, and the first cavity closer to the interior of the vehicle body also serve as an energy absorption cavity. Therefore, after the chassis of this embodiment is subjected to a side collision, the collision load can be absorbed by the first cavity and the second cavity in sequence when passing through the sill beam during the inward transmission process, thus improving the collision energy absorption performance of the chassis.

[0016] In some embodiments, the height of the third vertical plate is less than the height of the second vertical plate.

[0017] The height of the third vertical plate in this embodiment is less than the height of the second vertical plate, which makes the space occupied by the third vertical plate smaller and facilitates the arrangement of other structures.

[0018] In some embodiments, the frame further includes two crossbeams disposed opposite each other in the length direction of the lower vehicle body, the crossbeams comprising a channel-shaped structure.

[0019] By incorporating crossbeams, the structural strength of the frame can be enhanced, and the crossbeams can create different load paths on the frame, thereby further reducing frame deformation and improving frame reliability. Furthermore, the crossbeams can plan the internal space of the frame, improving the rational layout of battery cells and increasing the space utilization of the chassis. Designing the crossbeams as a channel structure facilitates integrated die-casting. Moreover, the channel structure creates a cavity, which in turn forms an energy-absorbing chamber, particularly beneficial for absorbing collision loads when the chassis is subjected to front-to-back collisions.

[0020] In some embodiments, the crossbeam further includes a second reinforcing plate disposed within the cavity of the channel structure. The second reinforcing plate within the cavity of the channel structure enhances the strength of the crossbeam.

[0021] In some embodiments, the lower body also includes an expansion beam disposed within a receiving cavity, and the floor, frame, and expansion beam are integrally formed. In this embodiment, the floor, frame, and expansion beam of the lower body are all integrally formed, thus further improving the integration of the chassis. Furthermore, it reduces production steps and improves production efficiency.

[0022] In some embodiments, the chassis further includes a cover plate. The receiving cavity has an opening disposed opposite to the floor, and the cover plate closes onto the opening.

[0023] The cover plate is positioned opposite the floor, meaning it's located below the battery cells. It's detachably connected to the frame and used to cover openings. Since the battery cells are located in the chassis area, they are susceptible to scrapes or collisions from the undercarriage during driving, which could further compress them. External compression can cause mechanical bonding within the battery cells, leading to short circuits and other safety risks to the entire battery system. Therefore, a cover plate is installed at the bottom of the battery cells; this cover plate typically possesses sufficient strength to protect the battery cells.

[0024] In some embodiments, the chassis further includes a seat beam disposed on the side of the floor opposite to the receiving cavity, and the floor, frame, and seat beam are integrally formed. The integral forming of the floor, frame, and seat beam in this embodiment allows all structures of the lower vehicle body to be integrally formed, further improving the integration of the chassis in this embodiment. It also reduces production steps and improves production efficiency.

[0025] Secondly, this application provides a vehicle including the aforementioned chassis and an upper body, the upper body being detachably connected to the lower body. The upper body can be replaced as needed; in other words, the chassis can be adapted to various vehicle models. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of the chassis according to some embodiments of this application.

[0028] Figure 2 This is a three-dimensional structural schematic diagram of the chassis from another angle of some embodiments of this application.

[0029] Figure 3 This is a three-dimensional structural schematic diagram of the chassis from another angle of some embodiments of this application.

[0030] Figures 4 to 6 This is a schematic diagram illustrating the assembly steps of the chassis according to some embodiments of this application.

[0031] Figure 7 This is a top view of the chassis structure of some embodiments of this application.

[0032] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure along the CC direction.

[0033] Figure 9 yes Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0034] Figure 10 This is a schematic diagram of the chassis structure of some embodiments of this application.

[0035] Figure 11 yes Figure 10 The diagram shows a top view of the chassis structure.

[0036] Figure 12 This is a schematic diagram of the load transmission path when the chassis of this application is subjected to a longitudinal collision load.

[0037] Figure 13 This is a schematic diagram of the load transmission path when the chassis of this application is subjected to a lateral collision load.

[0038] The accompanying drawings are not drawn to scale.

[0039] Marker explanation:

[0040] 10. Get off the vehicle.

[0041] 11. Frame; 111. Threshold beam; 1111. First vertical plate; 1112. Second vertical plate; 1113. First horizontal plate; 1114. First reinforcing plate; 1115. Third vertical plate; 1116. Second horizontal plate; 1116. 112. Horizontal beam; 1121. Channel structure; 1122. Second reinforcing plate.

[0042] 13. Seat beam.

[0043] 14. Expansion beam.

[0044] 15. Floor.

[0045] 20. Battery cell.

[0046] 30. Cover plate. Detailed Implementation

[0047] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate 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.

[0050] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0052] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0054] Currently, new energy vehicles include batteries, which provide electrical energy to the vehicle. A battery consists of a cover, a battery housing, and multiple individual battery cells housed within the housing. In the battery production process, the battery housing is first assembled by welding and riveting sheet metal or profile parts. These smaller assemblies are then welded together to form the battery housing. Multiple individual battery cells are then placed inside the housing and assembled with the cover to form the battery. Finally, the battery is installed on the chassis of the new energy vehicle.

[0055] It is evident that this makes the manufacturing process of new energy vehicles more complex, leading to low production efficiency. To solve this problem, a separate vehicle manufacturing method based on CTC (Cell To Chassis) technology can be used, where the battery cells are directly installed in the energy compartment of the lower body. The energy compartment gradually evolves from a traditional battery box into a part of the lower body. In other words, the separate battery box is eliminated, and instead, a part of the lower body structure forms the battery box.

[0056] During the research process, the inventors discovered that using a portion of the lower body structure to form the battery box involved many production steps, resulting in low production efficiency, because the various structures of the lower body needed to be connected to each other through welding, riveting, and other methods to form the battery box.

[0057] To address this issue, some embodiments of this application provide a chassis including a lower body 10 and a battery cell 20. The lower body 10 includes a floor 15 and a frame 11 extending in the circumferential direction of the floor 15. The floor 15 and the frame 11 are integrally formed. The frame 11 and the floor 15 enclose a receiving cavity. The battery cell 20 is received and placed within the receiving cavity. Thus, the floor 15 and the frame 11 for forming the receiving cavity in the chassis provided by the embodiments of this application are integrally formed. Through this integration, the production process chain is shortened and production efficiency is improved.

[0058] The following is based on Figures 1 to 13 The structure of the chassis of some embodiments of this application will be described in detail.

[0059] like Figures 1 to 5 As shown, the chassis of some embodiments of this application includes a lower body 10 and a battery cell 20. The lower body 10 includes a floor 15 and a frame 11 extending circumferentially from the floor 15. The floor 15 and the frame 11 are integrally formed. The frame 11 and the floor 15 enclose a receiving cavity. The battery cell 20 is housed within the receiving cavity.

[0060] like Figure 1As shown, the chassis of this application embodiment includes a lower body 10. The lower body 10 includes a floor 15 and a frame 11 extending in the circumferential direction of the floor 15. In a specific embodiment, the floor 15 is a rectangular structure, and the frame 11 is also a rectangular structure extending in the circumferential direction of the floor 15 and enclosing it. Specifically, the frame 11 includes two opposing sill beams 111 and two opposing crossbeams 112. The sill beams 111 extend along the length direction X of the lower body 10, and the crossbeams 112 extend along the width direction Y of the lower body 10. On the lower side of the floor 15, the frame 11 and the floor 15 form a receiving cavity. Therefore, the frame 11 forms the sidewall of the receiving cavity, the floor 15 forms the top wall of the receiving cavity, and the opposite ends of the floor 15 form openings. In some embodiments of this application, such as... Figure 6 As shown, a cover plate 30 is installed at the opening to close the receiving cavity.

[0061] like Figures 4 to 6 As shown, in the chassis of this embodiment, during assembly, an integrally formed upper body 10 is first provided. The upper body 10 has a receiving cavity. Multiple battery cells 20 are installed into the receiving cavity from bottom to top. Finally, the lower cover 30 is assembled with the receiving cavity to complete the assembly. It can be seen that the chassis of this embodiment simplifies the production process and improves production efficiency by integrally molding the floor 15 forming the receiving cavity and the frame 11. Furthermore, since multiple battery cells 20 are installed into the receiving cavity from bottom to top, installation and disassembly are performed from the lower side of the lower body, thereby reducing the impact on other parts on the upper side of the lower body and improving the ease of battery cell installation and maintenance.

[0062] refer to Figure 5 and Figure 6 In this embodiment, a plurality of battery cells 20 are housed within the accommodating cavity of the chassis. The plurality of battery cells 20 are arranged sequentially to form an array. The battery cells 20 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc. This embodiment is not limited to these types. The plurality of battery cells 20 are electrically connected via connecting tabs. The plurality of battery cells 20 can be connected in series, parallel, or a combination thereof. Each battery cell 20 includes a casing, end caps, electrode assemblies, and other functional components. The casing is a component used to fit the end caps to form the internal environment of the battery cell, wherein the formed internal environment can accommodate the electrode assemblies, electrolyte, and other components. The electrode assembly is the component in the battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the terminals to form a current loop. The electrode assembly can be a wound structure or a stacked structure, and the embodiments of this application are not limited thereto.

[0063] In the technical solution of this application embodiment, the floor 15 and frame 11 forming the receiving cavity are integrally formed. In this way, when assembling the chassis, multiple battery cells can be directly installed into the receiving cavity formed by the floor 15 and frame 11 without the need for multiple steps such as welding and riveting to form the battery box. Therefore, the production process can be simplified and the production efficiency can be improved.

[0064] In some embodiments, the floor 15 and frame 11 are integrally formed by die casting. In this embodiment, the chassis floor 15 and frame 11 are integrally formed by die casting, meaning that an integrated die casting process is used to manufacture the integrally formed floor 15 and frame 11. This makes the lower body 10 of this embodiment a single casting, which, compared to the prior art where the various structures of the lower body need to be connected by welding, riveting, etc., reduces the number of welding or riveting points, thus improving the overall strength and rigidity of the lower body. The integral forming of the floor 15 and frame 11, and their enclosure to form a receiving cavity, not only reduces the number of welding or riveting points but also eliminates the bonding areas of structural adhesive and sealant. This reduces safety issues such as water ingress, short circuits, and leaks caused by poor sealing after battery cell assembly, thereby improving the chassis's operational safety.

[0065] In some embodiments, the frame 11 includes two sill beams 111 disposed opposite to each other.

[0066] like Figure 1 and Figure 2 As shown, in this embodiment, the frame 11 includes two sill beams 111 arranged opposite each other. When the vehicle is subjected to a side collision, the collision load on the sill beam 111 will be transferred along the sill beam 111 to other integrally formed structures, thereby dispersing the load. In this embodiment, the sill beam 111 and the floor 15 are integrally die-cast, reducing the number of welding points and riveting points and other connection points inside the sill beam 111 (which are prone to become weak points on the path of collision load transfer), thereby improving the collision energy absorption performance of the chassis.

[0067] like Figure 3 , Figure 7 and Figure 8 As shown, in some embodiments, the sill beam 111 includes a first vertical plate 1111 and a second vertical plate 1112 disposed opposite to each other, and a first horizontal plate 1113 disposed between the first vertical plate 1111 and the second vertical plate 1112. The first horizontal plate 1113 divides the space between the first vertical plate 1111 and the second vertical plate 1113 into two first cavities located on the upper and lower sides of the first horizontal plate 1113, respectively.

[0068] like Figure 8As shown, in some embodiments, the sill beam 111 includes a first vertical plate 1111 and a second vertical plate 1112 disposed opposite to each other, and a first horizontal plate 1113 disposed between the first vertical plate 1111 and the second vertical plate 1112. The first vertical plate 111 and the second vertical plate 1112 are spaced apart and are approximately parallel to the height direction Z. Here, "approximately parallel" means that they are not required to be absolutely parallel to the height direction Z, and the first vertical plate 1111 and the second vertical plate 1112 are approximately planar plates. The first horizontal plate 1113 is approximately perpendicular to the height direction Z. Therefore, the first horizontal plate 1113 is disposed between the oppositely disposed first vertical plate 1111 and the second vertical plate 1112, making the cross-sectional shape of the sill beam 111 approximately H-shaped. That is, the inner cavity of the sill beam 111 is approximately divided into two first cavities by the first horizontal plate 1113.

[0069] The sill beam 111 in this embodiment has two first cavities inside. When the sill beam is impacted, the two first cavities respectively form energy-absorbing cavities, thereby absorbing and dispersing the impact energy. Moreover, the sill beam 111 in this embodiment includes a first vertical plate 1111, a second vertical plate 1112, and a first horizontal plate 1113. Therefore, the various structures of the sill beam 111 are generally planar plate structures, which makes it easier to form using an integral die-casting process.

[0070] In some embodiments, the sill beam 111 further includes a plurality of first reinforcing plates 1114 disposed within the first cavity. Each of the plurality of first reinforcing plates 1114 is connected at both ends to a first vertical plate 1111 and a second vertical plate 1112, respectively.

[0071] Multiple first reinforcing plates 1114 are set in the first cavity to improve the strength of the door sill beam 111 and optimize the chassis's anti-collision performance.

[0072] refer to Figure 3 In some embodiments, each first reinforcing plate 1114 is inclined relative to the first vertical plate 1111, and the ends of two adjacent first reinforcing plates 1114 are connected at one point to form a triangle.

[0073] like Figure 3 As shown, in the first cavity, multiple first reinforcing plates 114 are interconnected to form multiple triangular sub-cavities within the first cavity. This results in energy-absorbing cavities being provided along the entire extension direction of the sill beam 111, thereby expanding the impact resistance range of the sill beam 111.

[0074] refer to Figure 3 , Figure 4 , Figure 7 and Figure 8To further improve collision resistance, in some embodiments, the sill beam 111 further includes a third vertical plate 1115 disposed opposite to the second vertical plate 1112 and on the side of the second vertical plate 1112 away from the first vertical plate 1111, and a second transverse plate 1116 disposed between the second vertical plate 1112 and the third vertical plate 1115. The second transverse plate 1116 divides the space between the second vertical plate 1112 and the third vertical plate 1115 into two second cavities.

[0075] like Figure 3 As shown, the sill beam 111 includes a main beam and a secondary beam sequentially arranged in the width direction Y of the lower vehicle body 10, with the secondary beam located laterally outside the main beam. Both the main beam and the secondary beam extend along the length direction X, and their cross-sectional shapes are essentially the same, both being H-shaped. The second vertical plate 1112 forms part of both the main beam and the secondary beam. This design simplifies the structure of the sill beam 111 while still absorbing collision energy, thereby reducing the weight of the chassis.

[0076] In this embodiment, the sill beam 111 forms a second cavity by providing a second vertical plate 1113 opposite to the second vertical plate 1112 on the outside of the second vertical plate 1112. This results in both a second cavity near the outer side of the lower vehicle body 10 and a first cavity closer to the interior of the vehicle body serving as an energy-absorbing cavity in the lateral direction. Therefore, after the chassis of this embodiment is subjected to a side collision, the collision load can be absorbed by the first cavity and the second cavity in sequence as it passes through the sill beam during the inward transmission process, thus improving the collision energy absorption performance of the chassis.

[0077] In some embodiments, the height of the third vertical plate 1116 is less than the height of the second vertical plate 1112.

[0078] like Figures 1 to 3 As shown, the height of the third vertical plate 1116 is less than the height of the second vertical plate 1112, and the third vertical plate 1116 is located in the middle of the second vertical plate 1112 in the height direction. That is to say, in the height direction, the secondary beam of the sill beam 111 is located in the middle of the main beam.

[0079] The height of the third vertical plate 1116 in this embodiment is less than the height of the second vertical plate 1112, which makes the third vertical plate 1116 occupy less space and facilitates the arrangement of other structures.

[0080] refer to Figure 9 In some embodiments, the frame 11 further includes two crossbeams 112 disposed opposite each other in the longitudinal direction X of the lower vehicle body 10. The crossbeams 112 include a channel structure 1121.

[0081] By setting up the crossbeam 112, the structural strength of the frame 11 can be enhanced, and the crossbeam 112 can form different load paths on the frame 11, thereby further reducing the deformation of the frame 11 and improving its reliability. In addition, the crossbeam 112 can plan the internal space of the frame 11, improve the rational layout of the battery cells 20, and improve the space utilization of the chassis 100. Setting the crossbeam 112 as a channel structure is beneficial for integral die casting. Moreover, setting it as a channel structure forms a cavity structure, which in turn forms an energy absorption cavity, especially when the chassis is subjected to front-to-back collisions, it is beneficial for absorbing collision loads.

[0082] like Figure 2 As shown, in some embodiments, the crossbeam 112 further includes a second reinforcing plate 1122 disposed within the cavity of the groove structure 1121.

[0083] A second reinforcing plate 1122 is provided within the cavity of the channel structure 1121 to improve the strength of the crossbeam. Furthermore, the second reinforcing plate 1122 is also arranged in multiple triangles within the cavity of the channel structure 1121, thereby forming energy-absorbing cavities at different positions along the extension direction of the crossbeam 112, and providing second reinforcing plates at different positions, thus ensuring uniform strength at each position and reducing the problem of uneven stress caused by weak points.

[0084] In some embodiments, the lower vehicle body 10 further includes an expansion beam 14 disposed within a receiving cavity. The floor 15, frame 11, and expansion beam 14 are integrally formed.

[0085] like Figure 2 As shown, the receiving cavity is formed by the bottom surface of the floor 15 and the circumferentially enclosing frame 11. That is, when assembling the battery cell 20, the battery cell 20 is positioned below the floor 15. Each battery cell expands during charging and discharging; the expansion beam 14 extends parallel to the large surface of the battery cell and connects to the frame 11. Figure 2 In the specific embodiment shown, the expansion beam 14 extends along the width direction Y. However, in other embodiments, the extension direction of the expansion beam 14 is adaptively changed according to the arrangement direction of the battery cells.

[0086] In this embodiment, the floor 15, frame 11, and expansion beam 14 of the lower vehicle body are all integrally formed, which further improves the integration of the chassis in this embodiment. It also reduces production steps and improves production efficiency.

[0087] In some embodiments, the chassis further includes a cover plate 30. The receiving cavity has an opening disposed opposite to the floor 15. The cover plate 30 closes onto the opening.

[0088] The cover plate 30 is positioned opposite the floor 15, meaning it is located below the battery cell 20. It is detachably connected to the frame 11 and used to cover the opening. The battery cell 20 is located in the chassis area and is susceptible to scraping or collisions from the bottom during driving, which may further compress it. External compression of the battery cell 20 may cause mechanical bonding within its internal structure, leading to short circuits and potentially posing a safety risk to the entire battery. Therefore, a cover plate 30 is installed at the bottom of the battery cell 20. The cover plate 30 typically possesses a certain strength to protect the battery cell 20.

[0089] In some embodiments, the chassis also includes a seat beam 13 disposed on the side of the floor 15 opposite to the receiving cavity. The floor 15, frame 11, and seat beam 13 are integrally formed.

[0090] like Figure 2 As shown, the receiving cavity is formed by the bottom surface of the floor 15 and the circumferentially enclosing frame 11, meaning that when assembling the battery cell 20, the battery cell 20 is positioned below the floor 15. Figure 1 As shown, the seat beam 13 is located on the side of the floor 15 opposite to the receiving cavity, that is, on the upper side of the floor 15. Figure 1 and Figure 2 In the specific embodiment shown, the floor 15, frame 11 and seat beam 13 are formed by integral die casting.

[0091] In this embodiment, the floor 15, frame 11, and seat beam 13 are integrally formed, thus making all structures of the lower vehicle body integrally formed, further improving the integration of the chassis in this embodiment. It also reduces production steps and improves production efficiency.

[0092] This application provides a vehicle including the aforementioned chassis and upper body. The upper body is detachably connected to the lower body. The upper body can be replaced as needed; in other words, the chassis can be adapted to various vehicle models.

[0093] The chassis of this application embodiment can be applied to vehicles, which can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. This application embodiment does not impose any special limitations on the above-mentioned vehicles.

[0094] The following is based on Figures 1 to 13 The structure of the chassis and vehicle according to a specific embodiment of this application will be described in detail.

[0095] like Figures 1 to 6As shown, the chassis of this embodiment includes a lower body 10, a battery cell 20, and a cover plate 30. The lower body 10 includes a floor 15, a frame 11, a seat beam 13, and an expansion beam 14. The frame 11 includes two sill beams 111 arranged opposite each other in the width direction Y of the lower body and two crossbeams 112 arranged opposite each other in the length direction X of the lower body. The floor 15, frame 11, seat beam 13, and expansion beam 14 are integrally formed, and the frame 11 and floor 15 enclose a receiving cavity. The battery cell 20 is housed and placed in the receiving cavity.

[0096] The chassis in this embodiment integrates the various components of the lower body into a single design. It utilizes a one-piece die-casting structure to integrate the parts to be assembled, improving the overall strength of the chassis, enhancing the overall sealing performance of the cavities, reducing leakage points, shortening the assembly process chain, and increasing vehicle manufacturing efficiency. Simultaneously, it can further increase the energy density of the battery. This chassis embodiment reduces the number of parts and production steps, improving production efficiency and ensuring efficient chassis assembly. The one-piece die-casting process reduces the bonding area of ​​structural adhesives and sealants, lowering the risk of water ingress, short circuits, and leaks due to poor sealing after battery cell assembly.

[0097] Furthermore, the lower body of this embodiment adopts an integral casting process, reducing intermediate welding, riveting and other processes, thereby improving the overall strength and rigidity of the components.

[0098] like Figure 1 As shown, in the circumferential direction of the floor 15, the sill beam 111 and the crossbeam 112 are arranged adjacently to enclose the floor 15 and form a receiving cavity. The opening of the receiving cavity is disposed opposite to the floor 15. A cover plate 30 closes the opening to seal the receiving cavity.

[0099] like Figures 7 to 9 As shown, the threshold beam 111 of this embodiment includes a first vertical plate 1111, a second vertical plate 1112, and a third vertical plate 1115 arranged sequentially, a first horizontal plate 1113 disposed between the first vertical plate 1111 and the second vertical plate 1112, and a second horizontal plate 1116 disposed between the second vertical plate 1112 and the third vertical plate 1115. The first horizontal plate 1113 divides the space between the first vertical plate 1111 and the second vertical plate 1113 into two first cavities located on the upper and lower sides of the first horizontal plate 1113, respectively. The second horizontal plate 1116 divides the space between the second vertical plate 1112 and the third vertical plate 1115 into two second cavities on the upper and lower sides. That is, the threshold beam 111 of this embodiment has an H-shaped cross-section.

[0100] Furthermore, such as Figure 7 and Figure 3As shown, multiple first reinforcing plates 1114 are sequentially arranged within the first and second cavities. These first reinforcing plates are inclined relative to the cavity walls on both sides, and the ends of adjacent first reinforcing plates 1114 are connected at the same position, thus forming multiple sub-cavities with triangular cross-sections within the first and second cavities. This embodiment improves the chassis strength by incorporating reinforcing plates within the cavities. Furthermore, this embodiment uses an integrated die-casting method to form the lower body, allowing the stress to be transferred along the lower body to the entire lower body during a collision, avoiding localized stress. The sill beams on both sides use an H-shaped cross-section combined with cross-reinforcing plates to form energy-absorbing and structurally reinforced areas, ensuring sill strength while maximizing the dispersion of collision energy during a collision.

[0101] like Figure 2 , Figure 7 and Figure 9 As shown, the crossbeam 112 includes a channel-shaped structure 1121 and multiple second reinforcing plates 1122 disposed within the channel cavity of the channel-shaped structure 1121. Multiple second reinforcing plates 1122 are disposed within the channel cavity of the channel-shaped structure 1121 to improve the strength of the crossbeam. Furthermore, the multiple second reinforcing plates 1122 are also arranged in multiple triangular configurations within the channel cavity of the channel-shaped structure 1121, thereby forming energy-absorbing cavities at different positions along the extension direction of the crossbeam 112, and providing second reinforcing plates at different positions, thus ensuring uniform strength at each position and reducing the problem of uneven stress caused by weak points.

[0102] like Figures 1 to 3 As shown, the seat beam 13 and expansion beam 14 in this embodiment are also channel-shaped structures with internal reinforcing plates. After the seat beam and expansion beam are integrated into a single design, the crossbeam structure is reinforced by combining a U-shaped cross section with corrugated reinforcing plates. This maximizes the utilization of the structural performance while ensuring strength and reducing the weight of the parts, all while meeting the functional requirements.

[0103] The lower body of this embodiment adopts a highly integrated strategy, maximizing the structural strength and reducing overlapping and redundant connections such as welding / riveting. This reduces the number of aluminum alloy and sheet metal parts used in the assembly, significantly reducing the weight of the lower body. Tests have shown that this can reduce weight by 20%-25%. Furthermore, the floor 15, frame 11, expansion beam 14, and seat beam 13 of the lower body in this embodiment are basically plate-like structures, making the lower body of this embodiment suitable for forming using an integrated die-cast structure.

[0104] like Figures 4 to 6As shown, the chassis assembly process in this embodiment is simplified. After the lower body is die-cast using an integrated die-casting process, it can directly enter the assembly line, reducing redundant assembly steps for small parts. After entering the assembly line, the battery cells are installed into the receiving cavity from bottom to top. Finally, the lower cover 30 is assembled with the receiving cavity to complete the assembly. The integrated die-casting process for the lower body eliminates unavoidable assembly errors caused by welding and riveting, ensuring the dimensional accuracy of the machining and assembly and the consistency of dimensions at each mounting point. This facilitates standardized production in the factory and improves the manufacturing efficiency of the chassis.

[0105] In this embodiment, the lower vehicle body 10 serves the dual functions of a battery box and a lower vehicle floor. For example... Figure 10 and Figure 11 As shown, the chassis also includes a front engine compartment 40 and a rear floor 50. The front engine compartment 40 is detachably connected to the front end of the lower body 10, and the rear floor 50 is detachably connected to the rear end of the lower body 10. Specifically, mounting points matching the front engine compartment 40 and the rear floor 50 need to be provided at both ends of the two sill beams 111. In a specific embodiment, the sill beams 111 can be connected to the front engine compartment 40 and the rear floor 50 by bolts.

[0106] like Figure 12 As shown in the figure, the transmission path of the longitudinal collision load Fx along the length direction of the chassis in this embodiment is indicated by the arrows. The solid line represents the main path of load transmission, and the dashed line represents the auxiliary force transmission and energy absorption path. After the longitudinal collision load Fx enters the chassis 10, it is transmitted inward along the direction of the arrows. Part of the energy is absorbed by the integrated lower body, while the unabsorbed portion continues to be transmitted and dispersed along the left and right sill beams 111, the front and rear crossbeams 112, the seat beams 13, and the reinforcing plates, achieving a collision energy absorption effect. It can be seen that since the lower body of this embodiment is an integrated structure, the collision load can be continuously transmitted along the lower body. Since there are no riveting points or welding points, localized force concentration can be avoided during the transmission process.

[0107] like Figure 13 As shown in the figure, the transmission path of the lateral collision load Fy on the chassis 10 in this embodiment is illustrated. The solid line represents the main load transmission path, and the dashed line represents the auxiliary force transmission and energy absorption path direction. Most of the load is converted and dispersed by the left and right sill beams of the integrated lower body to the internal crossbeams. The unabsorbed portion on the left and right sides continues to be transmitted along the left and right sill beams to the front engine compartment 40 and rear floor 50 of the chassis, and is finally absorbed and dispersed by the entire lower body, achieving the collision energy absorption effect.

[0108] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A chassis, characterized in that, include: The lower body (10) includes a floor (15) and a frame (11) extending in the circumferential direction of the floor (15), the floor (15) and the frame (11) being integrally formed, and the frame (11) and the floor (15) enclosing a receiving cavity; and The battery cell (20) is housed within the housing cavity.

2. The chassis according to claim 1, characterized in that, The floor (15) and the frame (11) are integrally formed by die casting.

3. The chassis according to claim 1, characterized in that, The frame (11) includes two sill beams (111) arranged opposite to each other.

4. The chassis according to claim 3, characterized in that, The threshold beam (111) includes a first vertical plate (1111) and a second vertical plate (1112) disposed opposite to each other, and a first horizontal plate (1113) disposed between the first vertical plate (1111) and the second vertical plate (1112). The first horizontal plate (1113) divides the space between the first vertical plate (1111) and the second vertical plate (1112) into two first cavities located on the upper and lower sides of the first horizontal plate (1113) respectively.

5. The chassis according to claim 4, characterized in that, The threshold beam (111) also includes a plurality of first reinforcing plates (1114) disposed in the first cavity, wherein the two ends of each of the plurality of first reinforcing plates (1114) are respectively connected to the first vertical plate (1111) and the second vertical plate (1112).

6. The chassis according to claim 5, characterized in that, Each of the first reinforcing plates (1114) is inclined relative to the first vertical plate (1111), and the ends of two adjacent first reinforcing plates (1114) are connected at one point to form a triangle.

7. The chassis according to any one of claims 4 to 6, characterized in that, The threshold beam (111) further includes a third vertical plate (1115) disposed opposite to the second vertical plate (1112) and disposed on the side of the second vertical plate (1112) away from the first vertical plate (1111), and a second transverse plate (1116) disposed between the second vertical plate (1112) and the third vertical plate (1115). The second transverse plate (1116) divides the space between the second vertical plate (1112) and the third vertical plate (1115) into two second cavities.

8. The chassis according to claim 7, characterized in that, The height of the third vertical plate (1115) is less than the height of the second vertical plate (1112).

9. The chassis according to claim 1, characterized in that, The frame (11) also includes two crossbeams (112) arranged opposite each other in the length direction (X) of the lower body (10), the crossbeams (112) having a channel structure.

10. The chassis according to claim 9, characterized in that, The crossbeam (112) also includes a second reinforcing plate disposed within the cavity of the groove structure.

11. The chassis according to claim 1, characterized in that, The lower body (10) also includes an expansion beam (14) disposed in the receiving cavity, and the floor (15), the frame (11) and the expansion beam (14) are integrally formed.

12. The chassis according to claim 1, characterized in that, The chassis also includes a cover plate (30), the receiving cavity having an opening opposite to the floor (15), the cover plate (30) covering the opening.

13. The chassis according to claim 1, characterized in that, The chassis also includes a seat beam (13) disposed on the side of the floor (15) opposite to the receiving cavity, the floor (15), the frame (11) and the seat beam (13) being integrally formed.

14. A vehicle, characterized in that, It includes a chassis and an upper body as described in any one of claims 1 to 13, wherein the upper body is detachably connected to the lower body.

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