rear floor assembly, rear floor assembly component, lower body assembly, body assembly, and vehicle

Abstract

This invention discloses a rear floor assembly, a rear floor assembly component, a lower body assembly, a body assembly, and a vehicle. The rear floor assembly includes a rear floor body, which is constructed as a single die-cast part and contains a front connecting area, a rear passenger floor area, a rear suspension mounting area, and a rear wheel arch area connected sequentially from front to rear. A first mounting part and a second mounting part are provided in the rear passenger floor area. The first mounting part is used to mount the seat support frame for the rear seats, and the second mounting part is located inside the first mounting part and is used to mount a battery. This single die-cast rear floor assembly integrates the seat support frame and the dedicated battery mounting position in the rear passenger floor area, placing the battery under the second-row seats. This eliminates the need for a separate battery bracket, simplifies assembly, and does not occupy trunk space. Simultaneously, its central placement within the vehicle enhances collision protection capabilities and ensures a stable low-voltage power supply for the intelligent driving system.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a rear floor assembly, a rear floor assembly component, a lower body assembly, a body assembly, and a vehicle. Background Technology

[0002] With the rapid development of pure electric vehicles and advanced intelligent driving technology, batteries, specifically 12V rechargeable batteries, provide regulated power and emergency power for the vehicle's low-voltage electrical appliances, intelligent driving sensors, and domain controllers, making them a core component for ensuring driving safety. As rear-wheel-drive models become more common, engine compartment space is occupied by motors and storage structures, leading to the widespread rear-mounted placement of batteries. This places higher demands on rear floor integration, space utilization, and collision protection.

[0003] Most current mass-produced vehicles place the battery on the side of the trunk, using an independent metal bracket mounted on a segmented welded rear floor. This arrangement takes up trunk storage space, and the battery is easily compressed in rear-end collisions or side impacts. Furthermore, the segmented floor does not have pre-reserved battery mounting points, requiring additional adapter brackets, resulting in a large number of parts and a cumbersome assembly process.

[0004] Therefore, it is necessary to design a rear floor assembly, a rear floor assembly component, a lower body assembly, a body assembly, and a vehicle to enable the battery to avoid rear-end collisions and free up trunk space. Summary of the Invention

[0005] To address some or all of the aforementioned technical problems in the prior art, this invention proposes a rear floor assembly, a rear floor assembly component, a lower body assembly, a body assembly, and a vehicle. This one-piece die-cast rear floor assembly integrates a seat support frame and a dedicated battery mounting location in the rear passenger floor area, placing the battery under the second-row seats. This eliminates the need for a separate battery bracket, simplifies assembly, and does not occupy trunk space. Simultaneously, its centrally located position enhances collision protection capabilities and ensures a stable low-voltage power supply for the intelligent driving system.

[0006] According to a first aspect of the present invention, a rear floor assembly is provided, comprising a rear floor body, the rear floor body being constructed as an integral die-cast part, and including a front end connection area, a rear passenger floor area, a rear suspension mounting area and a rear wheel arch area connected sequentially from front to rear, wherein a first mounting portion and a second mounting portion are provided in the rear passenger floor area, the first mounting portion being used to mount a seat support frame for a rear seat, and the second mounting portion being located inside the first mounting portion and used to mount a battery.

[0007] In one embodiment, the first mounting part is configured as a plurality of mounting recesses, and a first detachable connector is provided in each of the mounting recesses.

[0008] In one embodiment, the second mounting part is configured as a mounting boss, and a second detachable connector is provided on the mounting boss.

[0009] According to a second aspect of the present invention, a rear floor assembly is provided, comprising: the aforementioned rear floor assembly, The rear seats include a seat support frame and a seat cushion laid on the seat support frame. The seat support frame is connected to the first mounting part, and the seat support frame, the rear floor assembly, and the seat cushion form an installation space. A storage battery, which is connected to the second mounting part and located within the mounting space.

[0010] In one embodiment, the seat support frame includes a support frame and a support beam disposed on the support frame. The support frame is spaced apart from the rear passenger floor area to store the battery, and the support beam and the support frame support the seat cushion.

[0011] In one embodiment, the rear end of the seat cushion is hinged to the support frame.

[0012] In one embodiment, the front end of the seat cushion is snapped onto the support frame.

[0013] In one embodiment, a snap-fit ​​element is provided on the bottom side of the front end of the seat cushion, the snap-fit ​​element is provided with snap-fit ​​teeth, and a snap-fit ​​ring is provided on the support frame. The snap-fit ​​element drives the snap-fit ​​teeth to insert into the snap-fit ​​ring so that the snap-fit ​​teeth and the snap-fit ​​ring are snapped together.

[0014] In one embodiment, the seat support frame is connected to the first mounting portion via legs, each leg being constructed as a U-shaped groove, and a reinforcing plate is provided at the bottom end of the leg, filling the groove of the leg, and the reinforcing plate is flatly embedded into the first mounting portion.

[0015] In one embodiment, there are multiple support legs, which are spaced apart in the circumferential direction of the support frame, and guardrails with both ends connected to the corresponding support legs are provided between adjacent support legs.

[0016] In one embodiment, the battery is placed on the second mounting portion, and a battery holder is provided on the outer wall of the battery, the battery holder being connected to the second mounting portion.

[0017] In one embodiment, there are two batteries, spaced apart laterally on the rear floor body.

[0018] According to a third aspect of the present invention, a lower vehicle assembly is provided, including the aforementioned rear floor assembly component.

[0019] According to a fourth aspect of the present invention, a vehicle body assembly is provided, including the lower vehicle body assembly described above.

[0020] According to a fifth aspect of the present invention, a vehicle is provided, comprising the aforementioned body assembly.

[0021] Compared with existing technologies, the advantages of this invention are as follows: It adopts a one-piece die-cast rear floor body, integrating the front-end connection area, rear passenger floor area, rear suspension mounting area, and rear wheel arch area from front to rear. The rear passenger floor area has a first mounting section and a second mounting section inside and outside, unlike the traditional segmented welded floor structure with an independent battery bracket. During operation, the one-piece casting can evenly distribute bumps and collision loads across the entire area, with four zones providing progressively buffered impacts. The battery is centrally located away from rear-end and side-impact risk areas, and the seat support frame and floor form a double-layer protection, ensuring the battery can continuously power the intelligent driving system even in a collision. The one-piece die-casting eliminates multiple stamping and welding processes, increasing production speed, reducing component costs, and reducing overall vehicle weight. The battery is stored under the seat, increasing the trunk capacity. The rigidity of the mid-section of the vehicle body is improved, and collision safety and NVH performance are optimized simultaneously. Battery maintenance only requires lifting the seat cushion, shortening repair time. This effectively solves the shortcomings of traditional solutions, such as occupying storage space, having many components, being prone to battery damage in collisions, and being cumbersome to assemble and maintain. Attached Figure Description

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein: Figure 1 A perspective view of a rear floor assembly according to an embodiment of the present invention is shown, wherein the seat cushion is in an open state; Figure 2 A partial side view of a rear floor assembly according to an embodiment of the present invention is shown, wherein the seat cushion is in a closed state.

[0023] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, the directions such as up, down, left, right, front, and rear are defined with reference to the normal horizontal driving state of the vehicle. They are only used to clearly define the relative layout of the structure and do not constitute a limitation on the specific structure, installation posture, and protection range of the product. This is a common way of defining the orientation of automotive chassis structure patents in this field.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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 invention according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] This invention provides a rear floor assembly. The rear floor assembly includes a rear floor body 101, which is manufactured using a one-piece die-casting process, forming a single, integrated die-cast structure. This rear floor body 101 completely eliminates the segmented steel plate stamping and spot-welding combination structure used in traditional automotive rear floor systems. The entire component has no seams or gaps between parts, and the integrated base structure provides the rear floor assembly with higher overall structural strength. Along the longitudinal axis of the vehicle, the rear floor body 101 is integrally formed using a continuous, uninterrupted die-casting process, comprising four functional sections: a front connection area 102, a rear passenger floor area 103, a rear suspension mounting area 104, and a rear wheel arch area 105. All four functional sections are extended from the same casting body, forming a single integrated structure, completely avoiding the seams and weak points caused by traditional segmented assembly structures.

[0031] The rear passenger floor area 103, located directly beneath the second-row seats, is the core functional area for seat installation and battery placement. During the die-casting process, the rear passenger floor area 103 is integrally cast with two sets of functionally differentiated mounting points: the first mounting part 106 and the second mounting part 107. The second mounting part 107 is positioned inside the first mounting part 106 in the vehicle's transverse layout. The two mounting structures are synchronously die-cast and integrally formed, eliminating the need for subsequent secondary welding reinforcement and manual machining for hole positioning, resulting in high structural precision. The two mounting structures have clearly defined and independent functions, without interference: the first mounting part 106 is specifically used for the assembly, positioning, and load-bearing fixation of the rear seat support frame, while the second mounting part 107 is specifically used for the load-bearing placement and locking fixation of the vehicle's 12V low-voltage battery.

[0032] The core function of the front connection area 102 is to achieve precise alignment and locking with the vehicle's floor assembly, enabling seamless assembly of the front and rear floors of the lower vehicle and ensuring the integrity of the lower vehicle's mid-section structure. The rear suspension mounting area 104 is used to achieve precise assembly and positioning of the vehicle's rear suspension system. The rear wheel arch area 105 is integrally die-cast, directly replacing the traditional independent wheel arch sheet metal structure. This invention, through the integrated design of four functional zones, achieves a three-in-one integrated arrangement of the passenger compartment load-bearing structure, chassis suspension assembly structure, and wheel arch protection structure, significantly improving the structural integration of the rear floor assembly.

[0033] The rear floor main body 101 is located in the middle and rear section of the vehicle, laterally centered in the middle area between the left and right door sills. The rear passenger floor area 103 maintains the lateral centering of the vehicle. The first mounting part 106 is evenly distributed on the outer side of the rear passenger floor area 103, while the second mounting part 107 is clustered in the lateral center area of ​​the vehicle. By optimizing the spatial layout, the battery mounting position is effectively kept away from high-risk collision areas such as the wheel arches on both sides of the vehicle and the side of the trunk. The casting body of the rear floor main body 101 is covered with a crisscrossing reinforcing rib structure. The front connecting area 102, the rear passenger floor area 103, the rear suspension mounting area 104, and the rear wheel arch area 105 are smoothly transitioned by gradually thickened ribs, which can effectively distribute various driving loads and completely eliminate the problem of local stress concentration in the structure.

[0034] In this invention, the rear floor body 101 is a seamless, one-piece die-cast part. Various loads generated by vehicle bumps and collisions can be uniformly conducted and diffused throughout the entire casting. Utilizing the layered distribution structure of the front connection area 102, rear passenger floor area 103, rear suspension mounting area 104, and rear wheel arch area 105, impact energy can be buffered step by step, effectively reducing the peak impact on the battery mounting points. The first mounting part 106 and the inner second mounting part 107 are arranged in a laterally staggered manner. After the seat support frame is assembled, it can, together with the rear floor assembly and seat cushion, form a closed interlayer space, completely enclosing the internal battery. The seat support frame and the one-piece die-cast floor together constitute a double-layer rigid protective structure.

[0035] Because the second mounting section 107 is located in a safe area at the lateral center of the vehicle body, away from high-risk rear-end collision locations, in the event of a rear-end or side collision, the impact energy can be gradually attenuated through the rear wheel arch area 105 and the rear suspension mounting area 104. The battery is secure and reliable, preventing displacement, loosening, or open circuits, and can continuously and stably output 12V low-voltage power to the vehicle's advanced intelligent driving system, ensuring its continuous and stable operation. Simultaneously, the integrated die-cast component highly integrates multiple assembly reference structures, enabling modular, rapid, and precise assembly of the rear seats and battery, effectively improving the overall vehicle assembly efficiency and precision.

[0036] In summary, the integrated die-cast rear floor body 101 adopted in this invention completely replaces the traditional multi-piece steel plate welded assembly, eliminating multiple processing steps such as sheet metal stamping, component welding, and weld seam anti-rust spraying in traditional production processes, significantly improving the overall vehicle manufacturing efficiency. Simultaneously, this structure completely eliminates auxiliary components such as battery adapter brackets, effectively reducing the overall vehicle material cost. Furthermore, the integrated die-cast structure enables vehicle lightweighting, reducing vehicle energy consumption and effectively improving the driving range of new energy vehicles. The battery is concealed within the interlayer under the seat, not occupying trunk storage space or passenger seating space, effectively improving the overall vehicle space utilization and product market competitiveness. The integrated die-cast structure completely eliminates the risk of weld seam fracture inherent in traditional welded structures. The battery is located in a safe area in the middle of the vehicle body and has a double-layer protective structure, significantly reducing the safety hazards of battery damage, short circuit, and fire in collision conditions. During the vehicle's after-sales maintenance phase, staff only need to lift the seat cushion to complete the battery inspection, maintenance, and replacement work, without having to disassemble a large number of vehicle interior components, which greatly reduces repair time and lowers the overall life cycle usage and maintenance costs of the vehicle.

[0037] This invention cleverly conceals the battery within a layer beneath the seat, completely resolving the issue of traditional battery placement structures encroaching on trunk storage space. This effectively increases usable trunk volume without compromising second-row passenger space, ensuring unaffected driving comfort. The integrated die-cast structure eliminates the risk of weld seam fracture, and the battery's placement in a safe central area with a double-layered protective structure significantly reduces the risk of battery damage, electrolyte leakage, and short-circuit fire in collision scenarios. For after-sales maintenance and battery replacement, the process can be performed simply by lifting the seat cushion, eliminating the need for extensive interior disassembly. This drastically reduces repair time and lowers overall vehicle lifecycle maintenance costs.

[0038] In one embodiment, the rear passenger floor area 103 of the rear floor body 101 is provided with a first mounting part 106. The first mounting part 106 is constructed as a plurality of mounting recesses 1061. The plurality of mounting recesses 1061 are arranged at intervals along the lateral and longitudinal directions of the rear passenger floor area 103 to form a multi-point mounting reference for the seat support frame 2011. Each mounting recess 1061 is a recessed groove structure integrally die-cast from the rear floor body 101. The bottom of the mounting recess 1061 is lower than the reference surface of the rear passenger floor area 103. The mounting recess 1061 is provided with an annular limiting stop 1063 around its perimeter. The annular limiting stop 1063 and the mounting recess 1061 together form a positioning and receiving structure for the support leg 2013. Each mounting recess 1061 is provided with a first detachable connector 1062. The first detachable connector 1062 is preferably a pre-embedded cast steel threaded bushing. The first detachable connector 1062 is integrated with the rear floor body 101 during the die casting process and is used to detachably connect the seat support frame 2011.

[0039] During operation, the seat support frame 2011 is placed at the first mounting part 106 via the outriggers 2013. The bottom end of the outrigger 2013 enters the corresponding mounting recess 1061 and is laterally and longitudinally limited by the annular limiting stop 1063, allowing the outrigger 2013 to quickly align with the first detachable connector 1062. The outrigger 2013 has a U-shaped groove structure, and a reinforcing plate 2014 is provided at the bottom end of the outrigger 2013. The reinforcing plate 2014 is flatly embedded in the mounting recess 1061, which increases the contact area between the outrigger 2013 and the mounting recess 1061 and distributes the load borne by the seat support frame 2011 to the rear floor body 101. The first bolt 1064 passes through the reinforcing plate 2014 and connects to the first detachable connector 1062, thereby stably locking the seat support frame 2011 above the rear passenger floor area 103. When disassembly or maintenance is required, simply disconnect the first bolt 1064 from the first detachable connector 1062 to separate the seat support frame 2011 from the rear floor body 101 without damaging the rear floor body 101.

[0040] In this application, the first mounting section 106 employs a structure with multiple mounting recesses 1061, providing multi-point positioning and multi-point load-bearing for the seat support frame 2011, thereby improving the seat installation accuracy and connection stability. The mounting recesses 1061 and the annular limiting stop 1063 can quickly limit the movement of the support leg 2013, reducing assembly alignment difficulty and improving overall assembly efficiency. The first detachable connector 1062 is pre-embedded within the mounting recesses 1061, providing high connection strength and good vibration resistance, reducing the risk of thread stripping and loosening after long-term use. The reinforcing plate 2014 is embedded within the mounting recesses 1061, further enhancing the bottom support rigidity of the support leg 2013, allowing the seat load to be more evenly distributed to the rear floor body 101. Simultaneously, this structure facilitates the disassembly and maintenance of the seat support frame 2011 and also helps to create a stable installation space 203 below the seat support frame 2011, providing space for the battery 202.

[0041] This embodiment refines the structure of the rear floor assembly. A second mounting part 107 is provided inside the rear passenger floor area 103 of the rear floor body 101. The second mounting part 107 is composed of an integrally die-cast mounting boss 1071. The mounting boss 1071 protrudes upward from the reference surface of the rear passenger floor area 103, and its overall thickness is thicker than the base plate surface of the rear floor body 101. Multiple sets of second detachable connectors 1072 are pre-embedded inside the mounting boss 1071. The second detachable connectors 1072 are cast steel threaded bushings, which are metallurgically bonded to the rear floor body 101 during the die-casting stage. They are evenly distributed at the four corners of the mounting boss 1071 and are used to fix the battery holder 2021 on the outer wall of the battery 202. The seat support frame 2011 is fixed to the mounting recess 1061 of the first mounting part 106 by the support legs 2013 and the reinforcing plate 2014. The seat support frame 2011, the rear floor body 101, and the seat cushion 2012 together form the mounting space 203, and the mounting boss 1071 is entirely inside the mounting space 203.

[0042] During operation, the battery 202 is placed on the top surface of the mounting boss 1071, and the battery base 2021 at the bottom of the battery 202 is attached to the mounting boss 1071 and locked in place by the second bolt 1073 and the second detachable connector 1072. Loads generated by vehicle bumps and steering are distributed and transmitted to the rear floor body 101 through the thickened mounting boss 1071. Water accumulated in the interlayer can drain from the surface of the boss, preventing corrosion of the bottom of the battery 202. In the event of a collision, the mounting boss 1071 absorbs the impact energy with its thickened base, preventing the battery 202 from being directly crushed and damaged. During disassembly, the battery 202 can be removed individually simply by loosening the connection between the second bolt 1073 and the second detachable connector 1072.

[0043] As can be seen, the mounting boss 1071 is integrally formed with the rear floor body 101, eliminating the need for a separate battery bracket and reducing the number of parts and assembly steps; the second detachable connector 1072 has a pre-embedded structure that resists vibration and fatigue, and will not slip or loosen during long-term driving; the battery 202 is hidden under the seat and does not occupy the trunk space, providing stronger collision protection and simplifying the disassembly and maintenance process.

[0044] This application also relates to a rear floor assembly, which includes a rear floor assembly, a rear seat 201, and a battery 202. The rear seat 201 consists of a seat support frame 2011 and a seat cushion 2012. The seat support frame 2011 is mounted on the mounting recess 1061 of the first mounting part 106, and is positioned above the rear passenger floor area 103. The seat cushion 2012 is laid and fixed on the top surface of the seat support frame 2011. The seat support frame 2011, the rear floor body 101, and the seat cushion 2012 together form a sandwich structure, creating an installation space 203. The battery 202 is placed against the mounting protrusion 1071 of the second mounting part 107 and locked in place by a second detachable connector 1072. The battery 202 is completely housed inside the installation space 203, and the highest point of the battery 202 is lower than the upper surface of the seat support frame 2011, so it will not interfere with the seat cushion 2012.

[0045] During assembly, the rear floor assembly is first assembled to the lower body, then the battery 202 is placed on the mounting boss 1071, the seat support frame 2011 is fixed, and finally the seat cushion 2012 is installed, sealing the installation space 203. During vehicle operation, the seat support frame 2011 provides upper buffer protection for the battery 202, while the integrated rear floor body 101 provides rigid bottom support. Bumps and collision loads are distributed and transmitted throughout the rear floor body 101, and the installation space 203 isolates the battery 202 from direct impact by external mud, sand, and gravel. The battery 202 is stably locked in the middle of the vehicle body, continuously providing stable power to the vehicle's low-voltage electrical appliances and advanced intelligent driving system. During after-sales maintenance, the battery 202 inside the installation space 203 can be directly exposed by lifting the seat cushion 2012, without disassembling the vehicle's interior components.

[0046] This embodiment optimizes the structure of the seat support frame 2011 based on the aforementioned rear floor assembly. The seat support frame 2011 includes a generally rectangular closed-loop support frame 2015 and multiple parallel support beams 2016. The support beams 2016 are fixed inside the support frame 2015, and the two together support the seat cushion 2012. U-shaped groove-shaped legs 2013 extend downward around the support frame 2015. The bottom end of the legs 2013 is fitted with a reinforcing plate 2014 and embedded in the mounting recess 1061 of the first mounting part 106 of the rear floor assembly. It is locked by the first detachable connector 1062, so that the support frame 2015 and the rear passenger floor area 103 maintain a fixed distance, forming a sandwich space for placing the battery 202. The battery 202 is fixed on the mounting boss 1071 of the second mounting part 107 and stored in the sandwich space. Meanwhile, a U-shaped groove support leg 2013 is provided in the middle section of the support beam 2016. The bottom end of the support leg 2013 is fitted with a reinforcing plate 2014 and embedded in the mounting recess 1061 of the first mounting part 106 of the rear floor assembly. It is locked by the first detachable connector 1062 so that the support beam 2016 and the rear passenger floor area 103 maintain a fixed distance.

[0047] After assembly, the support beam 2016 and the support frame 2015 form a complete load-bearing surface, distributing the vertical load of the seat cushion and occupants. The load is transferred to the rear floor body 101 via the outriggers 2013, preventing direct pressure on the battery 202 below. During bumpy driving or collisions, the support frame 2015 and support beam 2016 form an upper protective skeleton, isolating the seat cushion 2012 from sinking and impacting the battery 202. The openwork gaps between the support beams 2016 also allow for direct observation and disassembly of the battery 202. This structure eliminates the need for additional raised parts to form a battery storage compartment, simplifying component configuration. The support beams distribute the load, improving seat rigidity, eliminating slumping noises, and physically isolating the occupant load area from the battery, preventing damage from heavy pressure. The openwork frame facilitates battery heat dissipation, combining lightweight design, collision protection, and ease of future maintenance, ensuring a stable power supply from the battery to the advanced intelligent driving system.

[0048] In one specific embodiment, during assembly, the U-shaped groove opening of the outrigger 2013 faces the vehicle's forward direction, and a reinforcing plate 2014 is mounted at the bottom of the outrigger 2013. The reinforcing plate 2014 is embedded in the U-shaped groove. The U-shaped groove is arranged facing forward, and the two side uprights of the groove are arranged along the vehicle's front-rear direction. During vehicle movement, the front-rear impact load is borne by the two side walls of the U-shaped groove, and the load is evenly distributed and transferred to the rear floor body 101 through the reinforcing plate 2014. At the same time, the forward-facing opening provides operating space, allowing disassembly and assembly tools to be directly inserted through the groove to tighten the first bolt 1064. It can be seen that the U-shaped groove of the outrigger 2013 faces the front of the vehicle, which enhances its ability to withstand the front-rear impact force generated during vehicle acceleration and deceleration, reducing the risk of bending and deformation of the outrigger 2013; the groove structure reduces the weight of the outrigger 2013, achieving lightweighting; and with the limiting of the mounting recess 1061, assembly alignment is more convenient, and it is less prone to loosening during long-term use, significantly improving the overall installation stability of the seat.

[0049] In one specific embodiment, along the vertical direction from top to bottom, the height of the U-shaped groove sidewall of the outrigger 2013 gradually increases from top to bottom. The thinner upper sidewall achieves a lightweight design, while the increased height of the lower sidewall improves the structural rigidity at the bottom. When the seat is subjected to occupant pressure and vehicle bump loads, the lower sidewall can distribute the stress, reducing the probability of cracking at the base of the outrigger and improving the structural reliability of the outrigger during long-term use.

[0050] This embodiment further defines the assembly structure of the seat cushion 2012. The rear end of the seat cushion 2012 is hinged to the rear side frame of the support frame 2015 via a hinge. For example, the hinge can be constructed as a metal hinge structure, wherein one hinged hinge is fixed to the seat cushion 2012, and the other hinge is fixed to the support frame 2015. Two sets of hinges are arranged laterally at intervals along the support frame 2015, enabling the rear end of the seat cushion 2012 to be rotatably connected to the support frame 2015, and the front end of the seat cushion 2012 has no rigid locking structure and can be flipped upwards around the rear hinge point.

[0051] After assembly, the seat cushion 2012 lies flat on top of the support beam 2016, completely covering the space between the support frame 2015 and the rear passenger floor area 103 where the battery 202 is stored. When inspecting the battery 202, only the front end of the seat cushion 2012 is lifted upwards. The seat cushion 2012 flips upwards around the hinge point, completely exposing the mounting boss 1071 and the battery 202 in the open area between the support beams 2016, without the need to disassemble any connecting parts. This hinged structure eliminates the need for rear seat cushion clips, locking bolts, and other accessories, simplifying the number of parts and making the flipping operation convenient and effortless. Battery inspection and power-off maintenance can be carried out without completely disassembling the seat cushion, significantly reducing maintenance time. Under normal conditions, the seat cushion lies flat, sealing the space and preventing dust and sewage from entering the battery installation area, improving battery protection. At the same time, it does not affect the upper buffer protection of the battery 202 provided by the support frame 2015, balancing aesthetics for daily use with convenience for after-sales maintenance.

[0052] In one embodiment, the front end of the cushion 2012 is provided with a snap-fit ​​structure, and the rear end of the cushion 2012 is hinged to the rear side of the support frame 2015 by means of a metal hinge. The bottom side of the front end of the cushion 2012 is fixedly installed with a snap-fit ​​component 2017. The snap-fit ​​component 2017 extends downward and is integrally formed with multiple sets of barbed snap-fit ​​teeth. The front edge of the support frame 2015 is welded and fixed with an annular snap-fit ​​ring 2018 at the corresponding position. The snap-fit ​​ring 2018 has a hollow channel reserved inside for the snap-fit ​​teeth to be inserted.

[0053] When assembling the seat cushion 2012, the seat cushion 2012 is lowered and flattened with the rear hinge as the pivot point. The front locking piece 2017 falls with the seat cushion. The locking piece 2017 has wedge-shaped hook-shaped locking teeth, which are inserted into the locking ring 2018. The hook structure of the locking teeth and the inner wall of the locking ring 2018 are mutually hooked and tightened, thus locking and fixing the front end of the seat cushion 2012. This makes the seat cushion 2012 stably fit against the support beam 2016, completely sealing the interlayer installation space 203 where the battery 202 is stored below. When the battery 202 needs to be inspected, the front end of the seat cushion 2012 is pulled upward. The locking teeth are disengaged from the locking ring 2018, and the seat cushion 2012 can be flipped up around the rear hinge, directly exposing the mounting boss 1071 and the battery 202.

[0054] This snap-fit ​​structure requires no bolts or other fasteners, has fewer parts, and a simpler assembly process. The snap-fit ​​teeth and snap-fit ​​ring 2018 fit tightly, preventing the front of the seat cushion 2012 from warping or making abnormal noises during vehicle travel. It also continuously protects the battery 202 from dust and moisture. The snap-fit ​​mechanism requires no tools for installation and removal, allowing a single person to quickly open and close the seat cushion, significantly reducing battery maintenance and power-off operation time. Simultaneously, it does not damage the overall protective structure of the support frame 2015, balancing passenger comfort, battery protection, and ease of maintenance.

[0055] In the horizontal direction, multiple sets of snap-fit ​​structures are configured, for example, four sets. Two sets of snap-fit ​​components are located at the left end of the seat cushion 2012, and two sets are located at the right end. The two sets of snap-fit ​​components at the left end of the seat cushion are arranged at intervals along the front-to-back direction of the vehicle, and the two sets of snap-fit ​​components at the right end of the seat cushion are arranged at intervals along the lateral direction of the vehicle body. During assembly, the snap-fit ​​teeth below the snap-fit ​​components engage with the snap-fit ​​rings 2018 of the support frame 2011. In this way, the multi-point snap-fit ​​on both sides provides multi-point constraint for the seat cushion 2012. It can be seen that the four sets of snap-fit ​​structures arranged separately on the left and right sides have a balanced force distribution, preventing the seat cushion 2012 from tilting up on one side; the staggered arrangement in the front-to-back and lateral directions can suppress the left-to-right swaying and front-to-back movement of the seat cushion 2012; it can be unlocked by a single person, making disassembly and assembly convenient; under long-term bumpy driving conditions, the seat cushion 2012 is less likely to produce abnormal noises, and the sealing effect is better.

[0056] In this embodiment, the support frame 2015 is circumferentially arranged with multiple U-shaped groove legs 2013, for example, six legs. Guardrails 2019 are installed between adjacent legs 2013, with both ends of the guardrails 2019 fixed to the sidewalls of the corresponding legs 2013, forming a surrounding enclosure around the support frame 2015. Depending on the height of the legs 2013, multiple guardrails 2019 can be installed, for example, two, spaced vertically.

[0057] During operation, the guardrail 2019 and the outrigger 2013 form an integrated frame, reinforcing the overall rigidity of the seat support frame 2011. Simultaneously, it encloses the interlayer space from the side, preventing the battery 202 from sliding laterally and avoiding direct impact between the battery and the outrigger in the event of a collision. The guardrail can be welded, glued, bolted, or riveted to the outrigger 2013 to protect the battery 202, balancing structural strength and safety protection.

[0058] In one embodiment, two batteries 202 are arranged laterally and spaced apart along the rear floor body 101, and are placed together on the mounting boss 1071 of the second mounting part 107 inside the rear passenger floor area 103. Specifically, one battery 202 is placed at the middle of the approximate lateral position of the rear floor body 101, while the other battery 202 is placed at the left side of the rear floor body 101. A battery holder 2021 is integrally fitted to the bottom of the outer wall of each battery 202. The battery holder 2021 fits against the top surface of the mounting boss 1071. Multiple sets of second detachable connectors 1072 are pre-embedded on the mounting boss 1071. Second bolts 1073, fasteners, pass through the battery holder 2021 and lock with the second detachable connectors 1072, thus reliably fixing the battery 202 to the second mounting part 107. The two batteries 202 are spaced apart to allow for heat dissipation.

[0059] After assembly, the two batteries 202 are housed within the installation space 203 formed by the support frame 2015 and the rear passenger floor area 103, and are covered by the seat cushion 2012. The dual batteries are located away from the rear collision area, and the battery holder 2021 distributes the load during driving bumps, preventing localized pressure on the casing. The dual-power redundant layout provides stable power to the advanced intelligent driving system, and in the event of a single battery failure, the other can continuously output low-voltage electricity. The one-piece molded battery holder eliminates the need for additional fixing brackets, simplifies the assembly process, provides heat insulation and protection, and allows for separate inspection and replacement of the two batteries by simply lifting the seat cushion, balancing collision safety, power redundancy, and ease of future maintenance.

[0060] This application also relates to a lower body assembly, a body assembly, and a vehicle. The lower body assembly integrates the aforementioned rear floor assembly components, modularly assembling the rear floor assembly, rear seats, and dual batteries into a core mid-section structure of the lower body, which is then docked and fixed to the front floor, etc. The body assembly completely includes this lower body assembly, forming a complete load-bearing body frame together with body panels such as the side panels, roof, and front fascia. The vehicle is equipped with the aforementioned body assembly, and the entire vehicle relies on the dual battery layout located under the second-row seats to continuously and stably provide 12V low-voltage power to the vehicle's low-voltage electrical equipment and advanced intelligent driving system. The two batteries are located in the middle of the rear floor assembly, away from high-risk collision areas such as the trunk and rear wheel arches, forming a double-layer protective structure with the help of the seat support frame and the integrated die-cast rear floor. The entire layered integrated structure has a high degree of modularity, and the rear floor assembly components can be pre-assembled as a whole before docking with the lower body during the final vehicle assembly stage, making the assembly process simple and convenient. The battery is stored in a compartment under the seat, without taking up trunk storage space or passenger space, effectively improving the overall space utilization of the vehicle. In the event of a rear-end collision or side impact, the rear floor structure can gradually attenuate the impact energy, reducing the risk of battery damage and short circuits. Furthermore, the dual batteries employ a redundant power supply mode, so if one battery fails, the other can still provide power normally, preventing the advanced intelligent driving system from suddenly losing power and failing. This significantly improves the vehicle's collision protection capabilities, space utilization, and the reliability of the intelligent driving system.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A rear floor assembly, characterized in that, Includes a rear floor body, which is constructed as a single die-cast part and contains a front connecting area, a rear passenger floor area, a rear suspension mounting area and a rear wheel arch area connected sequentially from front to rear. The rear passenger floor area is provided with a first mounting part and a second mounting part. The first mounting part is used to install the seat support frame of the rear seat, and the second mounting part is located inside the first mounting part and is used to install the battery.

2. The rear floor assembly according to claim 1, characterized in that, The first mounting part is constructed as multiple mounting recesses, and a first detachable connector is provided in each of the mounting recesses.

3. The rear floor assembly according to claim 1, characterized in that, The second mounting part is constructed as a mounting boss, and a second detachable connector is provided on the mounting boss.

4. A rear floor assembly component, characterized in that, include: The rear floor assembly according to any one of claims 1 to 3, The rear seats include a seat support frame and a seat cushion laid on the seat support frame. The seat support frame is connected to the first mounting part, and the seat support frame, the rear floor assembly, and the seat cushion form an installation space. A storage battery, which is connected to the second mounting part and located within the mounting space.

5. The rear floor assembly according to claim 4, characterized in that, The seat support frame includes a support frame and a support beam disposed on the support frame. The support frame is spaced apart from the rear passenger floor area to store the battery. The support beam and the support frame support the seat cushion.

6. The rear floor assembly according to claim 5, characterized in that, The rear end of the seat cushion is hinged to the support frame.

7. The rear floor assembly according to claim 5, characterized in that, The front end of the seat cushion is snapped onto the support frame.

8. The rear floor assembly according to claim 7, characterized in that, A snap-fit ​​element is provided on the bottom side of the front end of the seat cushion. The snap-fit ​​element is provided with snap-fit ​​teeth. A snap-fit ​​ring is provided on the support frame. The snap-fit ​​element drives the snap-fit ​​teeth to insert into the snap-fit ​​ring so that the snap-fit ​​teeth and the snap-fit ​​ring are snapped together.

9. The rear floor assembly according to any one of claims 5 to 8, characterized in that, The seat support frame is connected to the first mounting part via support legs. Each support leg is constructed in the shape of a U-shaped groove. A reinforcing plate is provided at the bottom end of the support leg and fills the groove of the support leg. The reinforcing plate is flatly embedded into the first mounting part.

10. The rear floor assembly according to claim 9, characterized in that, The support legs are multiple and are spaced apart around the circumference of the support frame. Guardrails with both ends connected to the corresponding support legs are provided between adjacent support legs.

11. The rear floor assembly according to any one of claims 4 to 8, characterized in that, The battery is placed on the second mounting part, and a battery holder is provided on the outer wall of the battery. The battery holder is connected to the second mounting part.

12. The rear floor assembly according to claim 11, characterized in that, There are two batteries, which are spaced apart laterally on the rear floor body.

13. A lower vehicle body assembly, characterized in that, Includes the rear floor assembly as described in any one of claims 4 to 12.

14. A vehicle body assembly, characterized in that, Includes the lower body assembly as described in claim 13.

15. A vehicle, characterized in that, Includes the vehicle body assembly as described in claim 14.

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