A bus with a battery compartment bottom collision protection structure

Abstract

This invention provides a bus with a battery compartment bottom collision protection structure. The bus includes a frame, a battery compartment mounted on the frame, and a collision protection structure installed at the bottom of the battery compartment. The collision protection structure includes a bottom protection structure fixed to the frame, a bottom protection plate, and a reinforcing protection structure located above the bottom protection structure. The reinforcing protection structure includes multiple reinforcing beams arranged at intervals, with the ends of the reinforcing beams fixed to the frame. Adjacent reinforcing beams form accommodating spaces for the corresponding portions of the bottom protection plate to deform upwards. The battery compartment bottom collision protection structure provided by this invention enters the corresponding accommodating spaces when deformed under stress, thus preventing compression of the battery compartment bottom. This effectively solves the technical problem in the prior art where the battery compartment bottom protection structure deforms under stress, causing battery damage.

Description

Technical Field

[0001] This invention relates to the field of protection technology for battery compartments in passenger vehicles, specifically to an anti-collision structure at the bottom of the battery compartment. Background Technology

[0002] Currently, the battery compartments of electric buses are mostly located at the bottom of the middle of the vehicle frame, which makes the batteries in the battery compartment relatively close to the ground. When the bottom of the bus is scratched, scraped, or even punctured, the bottom of the batteries in the battery compartment is at risk of being scratched or bumped. When the battery is severely bumped, it can cause a short circuit inside the battery, thereby increasing the risk of the battery catching fire due to thermal runaway.

[0003] To protect batteries, the current measures taken by the bus industry for bottom collision protection of battery compartments in new energy buses mainly focus on two approaches: First, increasing the rigidity and strength of the battery pack structure to ensure battery collision safety. However, this inevitably leads to a significant increase in weight and cost, and since battery compartment doors are mostly made of aluminum, the improvement in rigidity and strength is not significant. Second, changing the battery's placement position, placing the battery on the roof or upper rear of the vehicle. However, placing the battery at a higher position will inevitably raise the vehicle's center of gravity, increasing the risk of rollover.

[0004] Therefore, the industry has begun to add collision protection structures to the bottom of the battery compartment to ensure the collision safety of the battery. For example, Chinese utility model patent with authorization announcement number CN215070186U discloses a protective plate for a power battery pack. The protective plate includes a plate-shaped main body, with reinforcing beams and reinforcing ribs fixed at the bottom of the main body. The reinforcing beams are arranged in parallel intervals, and the reinforcing ribs are arranged in a grid pattern. The reinforcing beams are provided with threaded sleeves. In use, bolts pass through the threaded sleeves and the main body in sequence and are threadedly connected to the bottom of the battery compartment to fix the protective plate to the bottom of the battery compartment.

[0005] The aforementioned protective plates for power battery packs can provide some protection for the battery compartment, but some problems still exist during use. In existing protective plates, the main body and reinforcing beams, as well as the main body and reinforcing ribs, are directly attached and fixed. When the protective plate is bumped or subjected to large-area impact, the reinforcing ribs and beams of the protective plate are directly stressed. This force is transmitted to the main body through the reinforcing ribs and beams, causing the main body to tend to deform upwards. This deformation of the main body is directly transmitted to the battery compartment, causing the bottom of the battery compartment to deform simultaneously when the main body deforms. This can easily crush the batteries in the battery compartment, causing damage. In addition, since the protective plate is directly fixed to the battery compartment, when the protective plate is impacted, the impact force received by the protective plate is directly transmitted to the batteries in the battery compartment, which also increases the risk of battery damage. Summary of the Invention

[0006] The purpose of this invention is to provide a bus with a battery compartment bottom collision protection structure to solve the technical problem that the battery compartment bottom protection structure in the prior art will deform under stress, thereby causing battery damage.

[0007] The bus with a battery compartment bottom collision protection structure in this invention adopts the following technical solution:

[0008] The bus with a battery compartment bottom collision protection structure includes a frame, on which a battery compartment is provided. A collision protection structure is installed at the bottom of the battery compartment. The collision protection structure includes a bottom protection structure fixed to the frame, and the bottom protection structure includes a bottom protection plate. The collision protection structure also includes a reinforcing protection structure located above the bottom protection structure. The reinforcing protection structure includes multiple reinforcing beams arranged at intervals. The ends of the reinforcing beams are fixed to the frame, and adjacent reinforcing beams form a space for the corresponding part of the bottom protection plate to deform upward.

[0009] Beneficial Effects: When the bus with a battery compartment bottom collision protection structure provided by this invention is subjected to scrapes, bottoming out, or even punctures at the bottom, the bottom protection plate on the lowest side of the bottom protection structure will directly bear the force. The reinforcing beams arranged on the upper side of the bottom protection plate will strengthen and support the bottom protection plate. When the bottoming out or puncture occurs between the two reinforcing beams, and the bottom protection plate deforms due to excessive force, compared to the arrangement of the bottom protection structure in the prior art that is close to the bottom of the battery compartment, the adjacent reinforcing beams in this invention form a receiving space. This allows the bottom protection plate to enter the corresponding receiving space when it deforms upward, thus preventing compression of the bottom of the battery compartment and protecting the battery in the battery compartment. In addition, since both the bottom protection structure and the reinforcing beams are fixed to the vehicle frame, when the bottom protection plate is impacted, part of the impact force on the bottom protection plate will be transferred to the vehicle frame, reducing the impact on the battery compartment and thus reducing the risk of battery damage due to impact.

[0010] Furthermore, the bottom protective structure includes an annular connecting bracket, or includes multiple connecting brackets arranged at an annular interval, the connecting brackets being welded to the vehicle frame, and the bottom protective plate being threaded onto the connecting brackets.

[0011] Beneficial effects: The bottom protective plate is threaded onto the connecting bracket, making it easier to disassemble and replace the bottom protective plate if it is damaged or deformed.

[0012] Furthermore, the connecting bracket is provided with a back-welded nut, and the bottom protective plate is provided with a bolt through hole. The bolt passes through the bolt through hole and is screwed into the corresponding back-welded nut so that the bottom protective plate and the connecting bracket are threaded together.

[0013] Beneficial effects: When assembling the bottom protective plate and the connecting bracket with threads, bolts are generally required to pass through the bottom protective plate and the connecting bracket respectively and be fixed with nuts. During the fixing process, tools are needed to fix the bolts and nuts at the same time. Since the bottom protective plate is installed at the bottom of the bus, the installation space at the bottom of the bus is generally quite tight, which makes the installation process very inconvenient. After the connecting bracket is equipped with back-welded nuts at the corresponding positions, it is not necessary to fix the nuts during the fixing process, which reduces the difficulty of installation.

[0014] Furthermore, the bolt hole is an elongated hole.

[0015] Beneficial effects: Since there are errors in the processing and assembly of the bottom protective plate and the connecting bracket, the bolt holes are designed as elongated holes, and the dimensional allowance of the elongated holes can be used to offset the errors during assembly.

[0016] Furthermore, the bottom protective plate includes a main body layer and a non-metallic protective layer located below the main body layer.

[0017] Beneficial effects: When the bottom of a bus is scratched or collided, the anti-rust electrophoretic coating on the bottom protective plate will be damaged, making the bottom protective plate prone to rust and thus reducing its own strength. The non-metallic protective layer can protect the anti-rust electrophoretic coating when scratched, and improve the corrosion resistance of the bottom protective plate.

[0018] Furthermore, the battery compartment includes separate bulkheads and a bottom, the bottom being formed of a plate with a strength lower than that of the bottom protective plate.

[0019] Beneficial effects: When the bus is scratched, scraped, or even punctured at the bottom, the bottom of the cabin will not be damaged by the impact under the protection of the bottom protective plate. The bottom of the cabin is made of a plate with a lower strength than the bottom protective plate. This is because the lower strength plate is cheaper than the higher strength plate and the lower strength plate is easier to process and shape.

[0020] Furthermore, the bottom of the compartment is provided with two upward-protruding, integrally formed convex ridges, which together with the bottom of the compartment form a battery guide groove.

[0021] Beneficial effects: The battery guide groove can help the battery be positioned faster during installation, improving battery assembly efficiency.

[0022] Furthermore, the reinforcing beam includes a U-shaped bracket with the opening facing downwards. The U-shaped bracket includes two support arms forming the opening and a connecting arm connecting the two support arms. The connecting arm is provided with bolt mounting holes. The bolts pass through the U-shaped bracket and the bottom of the battery compartment and fix the battery pack to the bottom of the battery compartment.

[0023] Beneficial effects: Using U-shaped brackets as reinforcing beams ensures protective strength while facilitating bolt drilling and fixing.

[0024] Furthermore, the bottom of the battery compartment is provided with spot welding holes, and the reinforcing beam is spot welded to the bottom of the battery compartment.

[0025] Beneficial effects: Strengthening the connection between the beam and the bottom of the battery compartment can improve the support effect of the reinforced beam on the bottom of the battery compartment. The bottom of the compartment is connected to the reinforced beam by spot welding through spot welding holes, which has the advantages of fast connection speed and high connection strength.

[0026] Furthermore, the reinforcing beam comprises rectangular steel with a rectangular cross-section.

[0027] Beneficial effects: Rectangular steel structures have greater strength and better support. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a bus with a battery compartment bottom collision protection structure provided by the present invention;

[0029] Figure 2 This is a schematic diagram of the collision protection structure arranged at the bottom of the battery compartment;

[0030] Figure 3 This is a schematic diagram of the collision protection structure and its fixation to the vehicle frame;

[0031] Figure 4 This is a schematic diagram of the structure for fixing the connecting bracket to the vehicle frame;

[0032] Figure 5 yes Figure 3 Top view of the bottom protective plate;

[0033] Figure 6 yes Figure 3 Schematic diagram of the bottom protective plate;

[0034] Figure 7 yes Figure 4 Schematic diagram of the middle connecting bracket;

[0035] Figure 8 yes Figure 7 A partial structural diagram of the connecting bracket;

[0036] Figure 9 This is a structural diagram of the bottom of the battery compartment;

[0037] Figure 10 yes Figure 9 A schematic diagram of the protruding ridges on the bottom of the middle compartment.

[0038] The names of the components corresponding to the corresponding reference numerals in the figure are:

[0039] 1. Frame; 11. Battery compartment; 12. Compartment bottom; 13. Compartment bottom perforation; 14. Raised ridge; 15. Spot weld hole; 2. U-shaped bracket; 21. Connecting arm; 22. Support arm; 23. Weight reduction hole; 24. Bolt mounting hole; 25. Rectangular steel; 3. Connecting bracket; 31. Bracket perforation; 32. Back weld nut; 33. Bottom protective plate; 34. Bolt perforation; 35. Main body layer; 36. Protective layer; 4. Battery pack. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0045] The present invention will be further described in detail below with reference to the embodiments.

[0046] Embodiment 1 of the bus with a battery compartment bottom collision protection structure in this invention:

[0047] like Figure 1 and Figure 2 As shown, the bus with a battery compartment bottom collision protection structure provided in this embodiment includes a frame 1, a battery compartment 11 on the frame 1, and a battery pack 4 installed in the battery compartment 11. The battery compartment 11 includes a compartment wall and a compartment floor 12. A collision protection structure is installed at the bottom of the battery compartment 11. The collision protection structure includes a bottom protection structure and a reinforced protection structure. The reinforced protection structure is located above the bottom protection structure, and both the reinforced protection structure and the bottom protection structure are fixed to the frame 1.

[0048] Specifically, such as Figure 2 and Figure 3 As shown, the bottom protective structure includes a bottom protective plate 33 and a connecting bracket 3. The connecting bracket 3 is a ring-shaped bracket, and it is welded and fixed to the frame 1. Figure 5 As shown, the bottom protective plate 33 is a rectangular plate, and the bottom protective plate 33 is threaded onto the connecting bracket 3. Multiple bolt holes 34 are arranged at intervals along the circumferential upward edge of the bottom protective plate 33. Correspondingly, as... Figure 7 and Figure 8As shown, the connecting bracket 3 has a bracket through hole 31, and a back-welded nut 32 is welded to the upper end face of the connecting bracket 3. Each back-welded nut 32 is aligned with each bracket through hole 31. The bolt passes through the bolt through hole 34 on the bottom protective plate 33 and is screwed into the back-welded nut 32 to complete the threaded assembly between the bottom protective plate 33 and the connecting bracket 3. It should be noted that when the bolt is screwed into the back-welded nut 32, the threaded section of the bolt can protrude through the bracket through hole 31, which can accommodate bolts of different lengths. Since there are errors in the processing and assembly of the connecting bracket 3 and the bottom protective plate 33, in order to avoid the situation where the bolt through hole 34 and the back-welded nut 32 cannot be aligned, the bolt through hole 34 is an elongated hole, and the allowance of the elongated hole can be used to compensate for the corresponding errors during assembly.

[0049] In this embodiment, the collision protection structure includes multiple reinforcing beams, which are spaced apart above the bottom protection structure and parallel to each other. The two ends of each reinforcing beam are welded and fixed to corresponding parts of the vehicle frame 1. Generally, the reinforcing beams extend laterally and are spaced apart in the front-rear direction. In the horizontal direction, there is a gap between adjacent reinforcing beams, forming a receiving space. When the portion of the bottom protection plate 33 located between adjacent reinforcing beams deforms upwards due to an impact, the deformed portion of the bottom protection plate 33 enters the corresponding receiving space, preventing the deformed portion of the bottom protection plate 33 from squeezing the bottom 12 of the battery compartment 11. In this embodiment, the upper side of the reinforcing beam is in support contact with the bottom 12 of the battery compartment 11, and the lower side of the reinforcing beam is in support contact with the bottom protection plate 33. Figure 2 and Figure 4 As shown, the reinforcing beam includes U-shaped brackets 2 and rectangular steel 25. Each U-shaped bracket 2 and each rectangular steel 25 is arranged alternately. The opening of the U-shaped bracket 2 faces downwards. Each U-shaped bracket 2 includes two support arms 22 forming an opening and a connecting arm 21 connecting the two support arms 22. The connecting arm 21 has bolt mounting holes 24. The battery pack 4 in the battery compartment 11 is fixed to the U-shaped bracket 2 with bolts. The bottom 12 of the battery compartment 11 has bottom through holes 13 corresponding to the bolt mounting holes 24. The bottom of the battery pack 4 has threaded holes. Bolts pass through the bolt mounting holes 24 and the bottom through holes 13 in sequence and are screwed into the threaded holes at the bottom of the battery pack 4 to complete the fixation of the battery pack 4 to the U-shaped bracket 2. The rectangular steel 25 has a rectangular cross-section. Compared to the U-shaped bracket 2, the rectangular steel 25 has higher structural strength. The rectangular steel 25 is ultra-high strength steel, specifically hot-formed steel. The rectangular steel 25 bears the main supporting role during support. In this embodiment, to achieve a lightweight design, the U-shaped bracket 2 is provided with weight reduction holes 23.

[0050] In this embodiment, the battery compartment 11 includes separately arranged bulkheads and a bottom 12, such as... Figure 9As shown, the bottom 12 is a plate-like structure, fixed to the bulkhead. In addition to the bottom perforation 13, the bottom 12 also has protruding ridges 14 and spot welding holes 15. Figure 10 As shown, the protruding rib 14 is integrally stamped on the bottom of the compartment 12. The protruding rib 14 is upwardly protruding and arranged parallel to both sides of the bottom of the compartment 12. The protruding ribs 14 on both sides cooperate with the bottom of the compartment 12 to form a battery guide groove. When the battery pack 4 is placed on the bottom of the compartment 12, the battery guide groove plays a guiding role in the extension direction of the battery guide groove, which improves the alignment efficiency between the bolt holes on the battery pack 4 and the bottom through holes 13 on the bottom of the compartment 12, and facilitates the fixing of the battery pack 4 to the U-shaped bracket 2. Figure 9 As shown, spot welding holes 15 are arranged on the bottom of the compartment 12, and the bottom of the compartment 12 is welded and fixed to the reinforcing beam located on the lower side of the bottom of the compartment 12 through the spot welding holes 15. In this embodiment, sealant is applied to the joint between the bottom of the compartment 12 and the compartment wall, so that the battery compartment 11 forms a sealed compartment to play a role in dust and water protection.

[0051] In this embodiment, due to the protection of the bottom protective plate 33, the bottom of the cabin 12 will not be directly impacted by external objects. The bottom of the cabin 12 is formed by a plate with a lower strength than the bottom protective plate 33. In actual engineering, the cost of a plate with lower strength is less than that of a plate with higher strength, which can save costs. Moreover, the plate with lower strength is easier to process and form.

[0052] In this embodiment, as Figure 6 As shown, the bottom protective plate 33 includes a main body layer 35 and a protective layer 36 located below the main body layer 35. The main body layer 35 is specifically made of quenched ductile steel with a tensile strength of 1180MPa. The main body layer 35 is plated with a zinc-iron alloy coating to prevent the main body layer 35 from being corroded. The protective layer 36 is a polymer coating to prevent the zinc-iron alloy coating on the main body layer 35 from falling off due to impact.

[0053] In use, the bottom protective plate 33 is designed to prevent scratches and punctures, while the bottom protective plate 33 and the reinforcing beam together are designed to prevent large-area bottom support.

[0054] Embodiment 2 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0055] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the bottom protective structure and the reinforced protective structure are welded and fixed to the vehicle frame. In this embodiment, the bottom protective structure and the reinforced protective structure are provided with threaded holes, and the vehicle frame corresponding to the bottom protective structure and the reinforced protective structure is provided with bolt fixing holes. Bolts pass through the corresponding threaded holes and bolt fixing holes, so that the bottom protective structure and the reinforced protective structure are fixed to the vehicle frame by bolts.

[0056] Embodiment 3 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0057] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the upper side of the reinforcing beam contacts the bottom support of the hull. In this embodiment, however, the upper side of the reinforcing beam does not contact the bottom of the hull, and the battery pack installed in the battery compartment is only fixed to the bottom of the hull by bolts.

[0058] Embodiment 4 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0059] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the connecting bracket is a ring-shaped bracket. In this embodiment, the connecting bracket includes multiple separately arranged connecting plates, each of which is welded to the frame. Each connecting plate has threaded holes, and the bottom protective plate is threadedly connected to each connecting plate by bolts.

[0060] Embodiment 5 of the present invention: a passenger vehicle with a battery compartment bottom collision protection structure.

[0061] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the connecting bracket is provided with a back-welded nut, and the connecting bracket is also provided with a bracket through hole corresponding to the back-welded nut, so that the bolt can be screwed into the back-welded nut and protrude through the corresponding bracket through hole. In this embodiment, the connecting bracket is not provided with a bracket through hole, but is provided with a back-welded threaded sleeve. The back-welded threaded sleeve has an internal thread of a set length to ensure the distance that various bolts can be screwed into the back-welded threaded sleeve.

[0062] Embodiment 6 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0063] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the reinforcing beam includes a U-shaped bracket and rectangular steel. In this embodiment, the reinforcing beam only includes the U-shaped bracket, which is made of ultra-high-strength steel to improve the structural strength. In other embodiments, the U-shaped bracket consists only of rectangular steel, and the battery pack installed in the battery compartment is fixed to the bottom of the compartment only by bolts.

[0064] Embodiment 7 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0065] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the hull bottom has spot welding holes, and the reinforcing beam is connected to the hull bottom by spot welding. In this embodiment, studs are welded to the upper side of the reinforcing beam, and the hull bottom has threaded holes corresponding to the studs. The studs pass through the threaded holes and are fixed by nuts to make the reinforcing beam and the hull bottom threadedly connected.

[0066] Embodiment 8 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0067] The difference between this embodiment and embodiment 1 is that in embodiment 1, the bottom of the cabin is integrally formed with protruding ridges, while in this embodiment, the bottom of the cabin is not provided with protruding ridges.

[0068] Embodiment 9 of the present invention: a bus with a battery compartment bottom collision protection structure.

[0069] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the hull is made of plates with lower strength than the bottom protective plate. In this embodiment, the hull and the bottom protective plate are made of plates of the same strength. In other embodiments, the hull may also be made of plates with higher strength than the bottom protective plate.

[0070] Embodiment 10 of the present invention: a passenger vehicle with a battery compartment bottom collision protection structure.

[0071] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the bottom protective plate includes a main body layer and a non-metallic protective layer. In this embodiment, the bottom protective plate only includes a main body layer, and the anti-rust electrophoretic coating on the main body layer is thickened to prevent the main body layer from being exposed when scratched, thus affecting the corrosion resistance of the bottom protective plate.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A passenger vehicle with a battery compartment bottom collision protection structure, comprising a frame (1), wherein a battery compartment (11) is provided on the frame (1), and a collision protection structure is installed at the bottom of the battery compartment (11), characterized in that, The collision protection structure includes a bottom protection structure fixed on the vehicle frame (1), the bottom protection structure includes a bottom protection plate (33), the collision protection structure also includes a reinforcing protection structure located above the bottom protection structure, the reinforcing protection structure includes multiple reinforcing beams arranged at intervals, the ends of the reinforcing beams are fixed on the vehicle frame (1), the reinforcing beams are located between the bottom of the battery compartment (11) and the bottom protection plate (33) and their upper side contacts the bottom support of the battery compartment (11), and adjacent reinforcing beams form a space for the corresponding part of the bottom protection plate (33) to deform upward; the bottom protection structure includes an annular connecting bracket (3), or includes multiple connecting brackets (3) arranged at intervals along the annular shape, the connecting brackets are welded to the vehicle frame, and the bottom protection plate is threaded onto the connecting brackets; the reinforcing beams include a U-shaped bracket (2) with the opening facing downward, the U-shaped bracket includes two support arms (22) forming an opening and a connecting arm (21) connecting the two support arms.

2. The bus with a battery compartment bottom collision protection structure according to claim 1, characterized in that, The connecting bracket (3) is provided with a back-welded nut (32), and the bottom protective plate (33) is provided with a bolt through hole (34). The bolt passes through the bolt through hole (34) and is screwed into the corresponding back-welded nut (32) so that the bottom protective plate (33) and the connecting bracket (3) are threaded together.

3. The bus with a battery compartment bottom collision protection structure according to claim 2, characterized in that, The bolt hole (34) is an elongated hole.

4. The bus with a battery compartment bottom collision protection structure according to any one of claims 1-3, characterized in that, The bottom protective plate (33) includes a main body layer (35) and a non-metallic protective layer (36) located on the underside of the main body layer (35).

5. The bus with a battery compartment bottom collision protection structure according to any one of claims 1-3, characterized in that, The battery compartment (11) includes separate compartment walls and a compartment bottom (12), the compartment bottom (12) being formed of a plate with a strength lower than that of the bottom protective plate (33).

6. The bus with a battery compartment bottom collision protection structure according to claim 5, characterized in that, The bottom of the compartment (12) is provided with two parallel protruding ridges (14) that protrude upwards and are integrally formed. The two protruding ridges (14) and the bottom of the compartment (12) cooperate to form a battery guide groove.

7. The bus with a battery compartment bottom collision protection structure according to any one of claims 1-3, characterized in that, The connecting arm (21) is provided with bolt mounting holes (24), and the bolts pass through the U-shaped bracket (2) and the bottom (12) of the battery compartment (11) and fix the battery pack (4) to the bottom (12) of the battery compartment (11).

8. The bus with a battery compartment bottom collision protection structure according to any one of claims 1-3, characterized in that, The bottom (12) of the battery compartment (11) is provided with spot welding holes (15), and the reinforcing beam is spot welded to the bottom (12) of the battery compartment (11).

9. The bus with a battery compartment bottom collision protection structure according to any one of claims 1-3, characterized in that, The reinforced beam consists of rectangular steel (25) with a rectangular cross-section.

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