Middle vehicle frame, vehicle frame assembly and pure electric commercial vehicle

Abstract

The application belongs to the technical field of commercial vehicles, and discloses a middle frame, a frame assembly and a pure electric commercial vehicle. The middle frame, the beam structure comprises two beam end plates which are opposite and spaced apart along a first direction, and the beam end plates are used for being connected with the frame longitudinal beam; the longitudinal beam structure comprises a longitudinal beam bottom plate and two longitudinal beam end plates which are opposite and spaced apart along a second direction, the two ends of the longitudinal beam bottom plate along the first direction are connected with the two beam end plates respectively, the two ends of the longitudinal beam end plate along the first direction are connected with the two beam end plates respectively, and the two ends of the longitudinal beam bottom plate along the second direction are connected with the two longitudinal beam end plates respectively; a containing space is formed between the longitudinal beam bottom plate, the two beam end plates and the two longitudinal beam end plates, and the containing space is used for containing a battery; and the first direction is perpendicular to the second direction. The structural strength of the middle frame is effectively improved, the structural strength and working performance of the frame assembly formed by the frame longitudinal beam and the middle frame are improved, and the endurance mileage of the pure electric commercial vehicle is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle technology, and more particularly to a mid-frame, a frame assembly, and a pure e-commerce vehicle. Background Technology

[0002] Electric vehicles, characterized by low noise, zero pollution, diverse energy sources, and high energy efficiency, are receiving increasing attention and support from the government and are gaining popularity, becoming an inevitable trend in vehicle development. The power battery pack, as the power source of electric vehicles and the energy storage device, directly affects the driving range of electric vehicles. This is especially true for pure electric heavy-duty commercial vehicles, which have even greater energy demands. Given a fixed battery energy density, the size of the battery pack determines the amount of energy it can store. Different arrangements of the power battery pack directly determine its size.

[0003] Currently, for commercial vehicle frame assemblies integrating longitudinal beams and battery packs, the battery pack is essentially the mid-frame. Most existing technologies use multiple beams spliced ​​together to form a battery pack with storage space, which serves as the mid-frame to house the battery. However, to ensure the structural strength of the commercial vehicle frame assembly formed by the longitudinal beams and mid-frame, additional beams are needed within the storage space to enhance the mid-frame's structural strength. This results in the storage space still needing to be divided into multiple sub-storage spaces, leading to a smaller battery pack volume. Summary of the Invention

[0004] The purpose of this invention is to provide a mid-frame, a frame assembly, and a pure electric commercial vehicle to solve the aforementioned problems existing in the prior art for commercial vehicle frame assemblies that integrate frame longitudinal beams and power battery boxes.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The center frame includes a center frame body, wherein the center frame body includes:

[0007] The crossbeam structure includes two crossbeam end plates that are opposite to each other and spaced apart along a first direction, the crossbeam end plates being used to connect to the longitudinal beams of the vehicle frame;

[0008] The longitudinal beam structure includes a longitudinal beam base plate and two longitudinal beam end plates that are opposite to each other and spaced apart along a second direction. The two ends of the longitudinal beam base plate along the first direction are respectively connected to the two transverse beam end plates, and the two ends of the longitudinal beam end plates along the first direction are respectively connected to the two transverse beam end plates. The two ends of the longitudinal beam base plate along the second direction are respectively connected to the two longitudinal beam end plates. An accommodating space is formed between the longitudinal beam base plate, the two transverse beam end plates, and the two longitudinal beam end plates, and the accommodating space is used to accommodate a battery. The first direction is perpendicular to the second direction.

[0009] As a preferred embodiment of the above-mentioned frame, there are multiple longitudinal beam structures, which are distributed sequentially along a third direction. The first direction is perpendicular to the second direction and both are perpendicular to the third direction.

[0010] Along the third direction, the top end of the longitudinal beam end plate of the top longitudinal beam structure is flush with the top end of the crossbeam end plate, and the bottom end of the longitudinal beam end plate of the bottom longitudinal beam structure is flush with the bottom end of the crossbeam end plate.

[0011] As a preferred embodiment of the above-mentioned frame, each of the two crossbeam end plates has a support boss on its adjacent end face. The two ends of the longitudinal beam bottom plate are respectively connected to the two support bosses along the first direction, and the two ends of the longitudinal beam bottom plate are respectively connected to the two support bosses along the first direction.

[0012] As a preferred embodiment of the above-mentioned CRRC frame, the bottom plate of the longitudinal beam is provided with multiple positioning holes, and the CRRC frame body also includes multiple positioning pins. The multiple positioning pins are arranged in a one-to-one correspondence with the multiple positioning holes, and the positioning pins are inserted into the support boss through the positioning holes.

[0013] As a preferred embodiment of the above-mentioned frame, the longitudinal beam bottom plate includes multiple sub-bottom plates. One of any two adjacent sub-bottom plates is provided with a wedge-shaped groove extending along the first direction, and the other is provided with a wedge-shaped post extending along the first direction. The wedge-shaped post is inserted into the wedge-shaped groove.

[0014] As a preferred embodiment of the aforementioned chassis, the sub-base plate is provided with a temperature regulating chamber and a weight reduction chamber. The temperature regulating chamber and the weight reduction chamber are distributed at intervals along the thickness direction of the sub-base plate, and the temperature regulating chamber is closer to the battery bearing surface of the sub-base plate than the weight reduction chamber.

[0015] As a preferred embodiment of the aforementioned mid-frame, the crossbeam end plate includes an inner end plate, an outer end plate, and a reinforcing frame fixedly disposed between the inner end plate and the outer end plate along the first direction; the longitudinal beam bottom plate is connected to the two inner end plates at both ends along the first direction, and the longitudinal beam end plate is connected to the two inner end plates at both ends along the first direction; the outer end plate is used to connect to the longitudinal beam of the frame.

[0016] The thickness of the inner end plate is less than the thickness of the outer end plate.

[0017] As a preferred embodiment of the aforementioned mid-frame, the thickness range of the inner end plate is: mm to mm; the thickness range of the outer end plate is: mm to mm.

[0018] The frame assembly includes the aforementioned midframe.

[0019] Vehicles used purely for e-commerce purposes include the aforementioned chassis assembly.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a mid-frame, a frame assembly, and a pure electric vehicle. The mid-frame includes a mid-frame body, which includes a crossbeam structure and a longitudinal beam structure. The crossbeam structure includes two crossbeam end plates that are opposite to each other and spaced apart along a first direction, and the crossbeam end plates are used to connect to the longitudinal beams of the frame. The longitudinal beam structure includes a longitudinal beam base plate and two longitudinal beam end plates that are opposite to each other and spaced apart along a second direction. The two ends of the longitudinal beam base plate along the first direction are respectively connected to the two crossbeam end plates, and the two ends of the longitudinal beam end plates along the first direction are respectively connected to the two crossbeam end plates. The two ends of the longitudinal beam base plate, the two crossbeam end plates, and the two longitudinal beam end plates form an accommodating space for accommodating a battery. The first direction is perpendicular to the second direction.

[0022] By setting up a longitudinal beam structure including a longitudinal beam base plate and two longitudinal beam end plates, the longitudinal beam base plate is connected to two crossbeam end plates at both ends along a first direction, and the longitudinal beam end plates are connected to two crossbeam end plates at both ends along the first direction. The longitudinal beam base plate is also connected to two longitudinal beam end plates at both ends along a second direction. This means the longitudinal beam end plates both define the battery placement position and function as longitudinal beams, while the longitudinal beam base plate serves both as a battery support and a longitudinal beam. This effectively improves the structural strength of the mid-frame, eliminating the need for additional beams within the storage space and allowing for the placement of more batteries. Secondly, the crossbeam end plates are plate-shaped, which, compared to the multiple beam splicing used in existing technologies, improves the structural strength of the crossbeam end plates and effectively enhances the connection reliability with the frame longitudinal beams. This effectively improves the structural strength of the mid-frame, enhances the structural strength and performance of the frame assembly formed by the frame longitudinal beams and the mid-frame, and effectively increases the driving range of pure electric commercial vehicles. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of the vehicle frame assembly provided in a specific embodiment of the present invention;

[0024] Figure 2 This is a partial structural diagram of the chassis assembly provided in a specific embodiment of the present invention. Figure 1 ;

[0025] Figure 3 This is a cross-sectional view of the midframe provided in a specific embodiment of the present invention. Figure 1 ;

[0026] Figure 4 This is a cross-sectional view of the midframe provided in a specific embodiment of the present invention. Figure 2 ;

[0027] Figure 5 yes Figure 3 A partial view at point A;

[0028] Figure 6 This is a cross-sectional view of the crossbeam end plate of the mid-frame provided in a specific embodiment of the present invention;

[0029] Figure 7 This is a partial structural diagram of the chassis assembly provided in a specific embodiment of the present invention. Figure 2 ;

[0030] Figure 8 This is a structural schematic diagram of the integrated connecting frame of the CRRC frame provided in a specific embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the first reinforcing member of the frame provided in a specific embodiment of the present invention;

[0032] Figure 10 yes Figure 1 A partial view at point B;

[0033] Figure 11 Yes, yes Figure 3 A partial view at point C.

[0034] In the picture:

[0035] 100. Mid-frame; 200. Front frame; 300. Rear frame; 400. Cab floor assembly; 410. Second connecting hole;

[0036] 11. Crossbeam end plate; 111. Inner end plate; 1111. Support boss; 112. Outer end plate; 113. Reinforcing frame; 1131. First reinforcing beam; 1132. Second reinforcing beam; 1133. Third reinforcing beam; 1134. Fourth reinforcing beam; 1135. Fifth reinforcing beam;

[0037] 12. Longitudinal beam base plate; 121. Sub-base plate; 1211. Wedge groove; 1212. Wedge column; 1213. Temperature regulating chamber; 1214. Weight reduction channel;

[0038] 13. Longitudinal beam end plates;

[0039] 14. First angle iron;

[0040] 2. Top protective panel;

[0041] 3. Side guard plate; 31. Clearance hole; 32. Drainage hole;

[0042] 4. Frame longitudinal beams;

[0043] 5. Integrated connecting frame; 51. First integrated part; 52. Second integrated part; 53. Third integrated part; 54. First connecting part; 55. Second connecting part; 56. Third connecting part; 57. First reinforcing rib; 58. Second reinforcing rib;

[0044] 6. Elastic bushing;

[0045] 7. Reinforcing structure; 71. First reinforcing member; 711. First reinforcing part; 712. Second reinforcing part; 713. Third reinforcing rib; 714. Weight reduction groove; 72. Second reinforcing member;

[0046] 8. Second connector;

[0047] 91. First sealing strip; 92. Second sealing strip;

[0048] 10. Support structure; 101. First support plate; 102. Second support plate. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0053] Currently, for commercial vehicle frame assemblies integrating longitudinal beams and battery packs, the battery pack is essentially the mid-frame. Most existing technologies use multiple beams spliced ​​together to form a battery pack with storage space, which serves as the mid-frame to house the battery. However, to ensure the structural strength of the commercial vehicle frame assembly formed by the longitudinal beams and mid-frame, additional beams are needed within the storage space to enhance the mid-frame's structural strength. This results in the storage space still needing to be divided into multiple sub-storage spaces, leading to a smaller battery pack volume.

[0054] like Figure 1-4 As shown, the present invention provides a mid-frame 100, which includes a mid-frame body. The mid-frame body includes a crossbeam structure and a longitudinal beam structure. The crossbeam structure includes two crossbeam end plates 11 that are opposite to each other and spaced apart along a first direction. The crossbeam end plates 11 are used to connect with the longitudinal beams 4 of the frame. The longitudinal beam structure includes a longitudinal beam bottom plate 12 and two longitudinal beam end plates 13 that are opposite to each other and spaced apart along a second direction. The two ends of the longitudinal beam bottom plate 12 along the first direction are respectively connected to the two crossbeam end plates 11, and the two ends of the longitudinal beam end plates 13 along the first direction are respectively connected to the two crossbeam end plates 11. The two ends of the longitudinal beam bottom plate 12 along the second direction are respectively connected to the two longitudinal beam end plates 13. An accommodating space is formed between the longitudinal beam bottom plate 12, the two crossbeam end plates 11, and the two longitudinal beam end plates 13. The accommodating space is used to accommodate a battery. The first direction is perpendicular to the second direction.

[0055] like Figure 1-4As shown, by setting the longitudinal beam structure including a longitudinal beam base plate 12 and two longitudinal beam end plates 13, the two ends of the longitudinal beam base plate 12 along the first direction are respectively connected to two crossbeam end plates 11, the two ends of the longitudinal beam end plates 13 along the first direction are respectively connected to two crossbeam end plates 11, and the two ends of the longitudinal beam base plate 12 along the second direction are respectively connected to two longitudinal beam end plates 13. It can be understood that the longitudinal beam end plates 13 can both define the battery placement position and be used as longitudinal beams, and the longitudinal beam base plate 12 can both support the battery and be used as longitudinal beams. This can effectively improve the structural strength of the mid-frame 100, so that no additional beams are needed in the accommodating space, and more batteries can be accommodated in the accommodating space. Secondly, the crossbeam end plates 11 are plate-shaped crossbeams, which can improve the structural strength of the crossbeam end plates 11 compared with the use of multiple beam splicing in the prior art, and can improve the connection reliability with the frame longitudinal beams 4. This effectively improves the structural strength of the mid-frame 100, enhances the structural strength and performance of the frame assembly formed by the frame longitudinal beam 4 and the mid-frame 100, and effectively improves the driving range of pure electric vehicles.

[0056] Understandably, the resulting accommodating space is roughly rectangular.

[0057] Among them, such as Figure 3 and Figure 4 As shown, there are multiple longitudinal beam structures, which are distributed sequentially along a third direction. The first direction is perpendicular to the second direction and also perpendicular to the third direction. Along the third direction, the top end plate 13 of the top longitudinal beam structure is flush with the top end plate 11 of the crossbeam end plate, and the bottom end of the bottom longitudinal beam end plate 13 of the bottom longitudinal beam structure is flush with the bottom end of the crossbeam end plate 11. This arrangement allows for the accommodation of more batteries, further improving the driving range of pure electric vehicles, and also further enhancing the structural strength of the two crossbeam end plates 11. It can be understood that, along the third direction, except for the one space at the top, the remaining spaces are all enclosed spaces, which can protect the batteries within the spaces.

[0058] Among them, such as Figure 2 , Figure 3 and Figure 6As shown in the figure, support bosses 1111 are provided on the end faces of the two crossbeam end plates 11 that are close to each other. The two ends of the longitudinal beam bottom plate 12 in the first direction are respectively lapped on the two support bosses 1111, and the two ends of the longitudinal beam bottom plate 12 in the first direction are respectively connected to the two support bosses 1111. The provision of the support bosses 1111 facilitates positioning the installation position of the longitudinal beam bottom plate 12 and also facilitates connecting the longitudinal beam bottom plate 12 and the two crossbeam end plates 11 into an integral structure. Among them, in this embodiment, bolts pass through the longitudinal beam bottom plate 12 and the support bosses 1111 and are threadedly connected to nuts to achieve detachably fixing the two ends of the longitudinal beam bottom plate 12 in the first direction to the two support bosses 1111 respectively.

[0059] Specifically, each crossbeam end plate 11 is provided with a plurality of support bosses 1111, and the plurality of support bosses 1111 are arranged corresponding to the plurality of longitudinal beam structures one by one.

[0060] Specifically, in this embodiment, as Figure 3 shown in the figure, the longitudinal beam end plate 13 is in a "C" shape, and the longitudinal beam end plate 13 is lapped on the longitudinal beam bottom plate 12 and fixedly connected to the longitudinal beam bottom plate 12. Among them, screws pass through the bottom of the longitudinal beam end plate 13 and are threadedly connected to the longitudinal beam bottom plate 12 to achieve detachably fixing the longitudinal beam end plate 13 to the longitudinal beam bottom plate 12. The longitudinal beam end plate 13 is fixedly connected to the crossbeam end plate 11 through the first angle iron 14.

[0061] Optionally, for any longitudinal beam bottom plate 12, the longitudinal beam bottom plate 12 is provided with a plurality of positioning holes, and the middle vehicle frame body further includes a plurality of positioning pins, and the plurality of positioning pins are arranged corresponding to the plurality of positioning holes one by one. The positioning pins pass through the positioning holes and are inserted into the corresponding support bosses 1111. To achieve positioning the installation position of the longitudinal beam bottom plate 12 on the crossbeam end plate 11.

[0062] It can be understood that for any longitudinal beam bottom plate 12, the plurality of positioning holes are all distributed in the area where one of the corresponding two support bosses 1111 is located. Or, a part of the plurality of positioning holes is distributed in the area where one of the corresponding two support bosses 1111 is located, and the remaining part is distributed in the area where the other of the corresponding two support bosses 1111 is located.

[0063] Among them, as Figure 3-5As shown, the longitudinal beam base plate 12 includes multiple sub-base plates 121. One of any two adjacent sub-base plates 121 is provided with a wedge-shaped groove 1211 extending along a first direction, and the other is provided with a wedge-shaped post 1212 extending along the first direction. The wedge-shaped post 1212 is inserted into the wedge-shaped groove 1211. The wedge-shaped groove 1211 and the wedge-shaped post 1212 act as guides during the assembly of the multiple sub-base plates 121, facilitating the assembly of the multiple sub-base plates 121 into the longitudinal beam base plate 12, and improving the deformation resistance of the assembled longitudinal beam base plate 12. Specifically, the wedge-shaped groove 1211 and the wedge-shaped post 1212 are inserted into each other along the first direction and / or the second direction.

[0064] Preferably, such as Figure 3 and Figure 5 As shown, when the wedge groove 1211 of one of any two adjacent sub-base plates 121 is inserted into the wedge post 1212 of the other, the top surfaces of the two sub-base plates 121 are coplanar, and the bottom surfaces of the two sub-base plates 121 are coplanar.

[0065] In other embodiments, the wedge groove 1211 may be adjusted to a rectangular groove, and the wedge post 1212 may be adjusted to a rectangular post, etc.

[0066] Preferably, the battery bearing surface is coated with thermally conductive structural adhesive. The battery is connected to the sub-base plate 121 by bolts and nuts.

[0067] Among them, such as Figure 3-5 As shown, the sub-base plate 121 contains a temperature regulating chamber 1213 and a weight reduction chamber. The temperature regulating chamber 1213 and the weight reduction chamber are distributed at intervals along the thickness direction of the sub-base plate 121, and the temperature regulating chamber 1213 is closer to the battery bearing surface of the sub-base plate 121 than the weight reduction chamber. By setting the temperature regulating chamber 1213, and placing it closer to the battery bearing surface of the sub-base plate 121 than the weight reduction chamber, the temperature of the batteries distributed on the battery bearing surface can be effectively improved, thereby effectively improving the battery's working performance and service life. Secondly, by setting the weight reduction chamber, and placing the temperature regulating chamber 1213 closer to the battery bearing surface of the sub-base plate 121 than the weight reduction chamber, the structural strength of the sub-base plate 121 can be improved while its weight can be reduced. In this embodiment, the thickness direction of the sub-base plate 121 is parallel to a third direction.

[0068] Specifically, both the inlet and outlet of the temperature-regulating chamber 1213 are connected to a temperature-regulating liquid source via a connecting connector. This enables effective temperature regulation of the batteries distributed on the battery support surface.

[0069] Specifically, the inlet and outlet of the temperature-regulating chamber 1213 are distributed along the first direction on one side of the sub-base plate 121. Alternatively, the inlet and outlet of the temperature-regulating chamber 1213 are distributed along the first direction on both sides of the sub-base plate 121. It is understood that the connecting joints at the inlet and outlet of the temperature-regulating chamber 1213 partially extend from the crossbeam end plate 11 to allow communication with the temperature-regulating liquid source.

[0070] In this embodiment, the temperature-regulating liquid source is exemplarily set as a water source. The temperature-regulating chamber 1213 is exemplarily set as a serpentine temperature-regulating channel, with its inlet and outlet connected to the water source via connecting joints. In other embodiments, the shape of the temperature-regulating chamber 1213 can be adaptively adjusted according to actual operating conditions.

[0071] In this embodiment, the exemplary weight-reduction chamber includes a plurality of weight-reduction channels 1214 spaced apart along a second direction, each weight-reduction channel 1214 penetrating the sub-base plate 121 along a first direction. It is understood that a partition rib is formed between any two adjacent weight-reduction channels 1214. This allows for both increased structural strength of the sub-base plate 121 and reduced weight of the sub-base plate 121. In other embodiments, the shape of the weight-reduction chamber can be adaptively adjusted according to actual working conditions.

[0072] Among them, such as Figure 1-4 and Figure 6 As shown, the crossbeam end plate 11 includes an inner end plate 111, an outer end plate 112, and a reinforcing frame 113 fixedly disposed between the inner end plate 111 and the outer end plate 112 along a first direction; the longitudinal beam bottom plate 12 is connected to the two inner end plates 111 at both ends along the first direction, and the longitudinal beam end plate 13 is connected to the two inner end plates 111 at both ends along the first direction; the outer end plate 112 is used to connect with the frame longitudinal beam 4; the thickness of the inner end plate 111 is less than the thickness of the outer end plate 112. Specifically, the two inner end plates 111 are provided with supporting bosses 1111 at their adjacent sections, and the two ends of the longitudinal beam bottom plate 12 along the first direction are correspondingly overlapped with the two supporting bosses 1111, and the two ends of the longitudinal beam bottom plate 12 along the first direction are correspondingly connected to the two supporting bosses 1111.

[0073] Specifically, compared to the solid crossbeam end plate 11, the reinforced frame 113 can further improve the structural strength of the crossbeam end plate 11 and reduce its weight. Secondly, since the outer end plate 112 is used to connect with the frame longitudinal beam 4, the outer end plate 112 is made thicker, which can effectively improve the connection reliability between the crossbeam end plate 11 and the frame longitudinal beam 4, and effectively reduce the risk of deformation of the crossbeam end plate 11. Thirdly, since the inner end plate 111 is used to support the longitudinal beam bottom plate 12 and the battery set on the longitudinal beam bottom plate 12, the load-bearing weight is relatively light, so the inner end plate 111 is made thinner, which can further reduce the weight of the crossbeam end plate 11 while ensuring connection reliability.

[0074] In this embodiment, as Figure 6 As shown, the exemplary reinforced frame 113 includes a first reinforcing beam 1131, a second reinforcing beam 1132, and a third reinforcing beam 1133. One end of the first reinforcing beam 1131, one end of the second reinforcing beam 1132, and one end of the third reinforcing beam 1133 are fixedly connected, and the fixed connection points of the first reinforcing beam 1131, the second reinforcing beam 1132, and the third reinforcing beam 1133 are fixedly connected to the inner end plate 111. The other ends of the first reinforcing beam 1131, the second reinforcing beam 1132, and the third reinforcing beam 1133 are respectively fixedly connected to the outer end plate 112. The first reinforcing beam 1131 and the third reinforcing beam 1133 are symmetrically distributed on both sides of the second reinforcing beam 1132, and both are distributed at an acute angle to the second reinforcing beam 1132. Optionally, the reinforcing frame 113 further includes a fourth reinforcing beam 1134 and a fifth reinforcing beam 1135. One end of the fourth reinforcing beam 1134 and one end of the fifth reinforcing beam 1135 are fixedly connected, and the fixed connection between the fourth reinforcing beam 1134 and the fifth reinforcing beam 1135 is fixedly connected to the inner end plate 111. The other ends of the fourth reinforcing beam 1134 and the fifth reinforcing beam 1135 are respectively fixedly connected to the outer end plate 112. The fourth reinforcing beam 1134 is distributed parallel to the second reinforcing beam 1132, and the fifth reinforcing beam 1135 is distributed parallel to the third reinforcing beam 1133. Further, the fixed connection is achieved by welding.

[0075] Specifically, the thickness of the inner end plate 111 ranges from 2mm to 5mm. The thickness of the outer end plate 112 ranges from 15mm to 25mm. It can be understood that the thickness of the inner end plate 111 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc. The thickness of the outer end plate 112 can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 23.5mm, 24mm, 24.5mm, or 25mm, etc.

[0076] Among them, such as Figure 1-4and Figure 7 As shown, the mid-frame 100 includes a top guard plate 2, which covers the top of the mid-frame body and is connected to two crossbeam end plates 11 and two longitudinal beam end plates 13 distributed along a third direction at the top. This is to protect the battery distributed along a third direction at the top layer, making the top layer's accommodating space also a closed space; secondly, the top guard plate 2 can further improve the structural strength of the mid-frame 100. In this embodiment, the top guard plate 2 is connected to the two crossbeam end plates 11 and the two longitudinal beam end plates 13 distributed along a third direction at the top by screws.

[0077] Among them, such as Figure 1-4 and Figure 7 As shown, the center frame 100 also includes two side guard plates 3, which are distributed along the second direction on both sides of the crossbeam structure and the longitudinal beam structure. Each side guard plate 3 is connected to one of the top and one of the bottom longitudinal beam end plates 13 on the corresponding side. This is to protect the center frame body on both sides along the second direction; secondly, the two side guard plates 3 can also further improve the structural strength of the center frame 100. In this embodiment, the side guard plates 3 are connected to one of the top and one of the bottom longitudinal beam end plates 13 on the corresponding side by screws.

[0078] Preferably, the crossbeam structure, longitudinal beam structure, top guard plate 2, and two side guard plates 3 of the center frame 100 are all made of aluminum alloy. Aluminum alloy is lightweight, and the formed center frame 100 has good structural strength.

[0079] The present invention also provides a frame assembly, including the aforementioned midframe 100. For example... Figure 1 , Figure 2 and Figure 7 As shown, the frame assembly also includes a front frame 200 and a rear frame 300, which are sequentially distributed along the length of the vehicle. Both the front frame 200 and the rear frame 300 include two longitudinal beams 4 spaced apart along the width of the vehicle. The two longitudinal beams 4 of the front frame 200 are connected to a crossbeam end plate 11 located at the front along the length of the vehicle, and the two longitudinal beams 4 of the rear frame 300 are connected to a crossbeam end plate 11 located at the rear along the length of the vehicle. The width of the middle frame 100 along a second direction is greater than the distance between the two longitudinal beams 4 of the front frame 200 and less than or equal to the maximum width of the cab. It can be understood that the first direction is parallel to the length of the vehicle, the second direction is parallel to the width of the vehicle, and the third direction is parallel to the height of the vehicle.

[0080] The frame assembly has a front frame 200, a middle frame 100 and a rear frame 300 that are independently distributed, which makes the size and weight of the frame longitudinal beams 4 small, thus facilitating the processing of the front frame 200, the middle frame 100 and the rear frame 300, facilitating the assembly of the battery into the middle frame 100, and facilitating the assembly of the front frame 200, the middle frame 100 and the rear frame 300, effectively improving the processing and assembly efficiency.

[0081] Understandably, the mid-frame 100 serves both to house the battery and as part of the longitudinal beams and crossbeams connecting the front frame 200 and the rear frame 300. This allows the mid-frame 100 to extend along the length, width, and height of the vehicle while ensuring the structural strength of the frame assembly, maximizing its volume. This effectively improves the utilization of chassis space compared to existing technologies, enabling the housing of more batteries, enhancing the integration of the frame assembly, and reducing its weight.

[0082] Among them, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the frame assembly also includes two integrated connecting frame assemblies, which are respectively configured one-to-one with the front frame 200 and the rear frame 300. In one integrated connecting frame assembly, the two integrated connecting frames 5 are symmetrically distributed on both sides of the front frame 200 and are configured one-to-one with the two longitudinal beams 4 of the front frame 200. In the other integrated connecting frame assembly, the two integrated connecting frames 5 are symmetrically distributed on both sides of the rear frame 300 and are configured one-to-one with the two longitudinal beams 4 of the rear frame 300. Each integrated connecting frame 5 includes a connecting body for connecting the longitudinal beams 4 of the frame and the middle frame 100; the integrated connecting frame 5 also includes a first integrated part 51, a second integrated part 52, and a third integrated part 53 integrated into the connecting body. The first integrated part 51 is used for connecting with a mudguard, the second integrated part 52 is used for connecting with a leaf spring, and the third integrated part 53 is used for connecting with the cab floor assembly 400.

[0083] By setting up a connecting body, it is possible to easily and quickly connect the two longitudinal beams 4 of the front frame 200 to a crossbeam end plate 11 distributed at the front along the length direction of the vehicle, and to easily and quickly connect the two longitudinal beams 4 of the rear frame 300 to a crossbeam end plate 11 distributed at the rear along the length direction of the vehicle, thereby enabling the front frame 200, the middle frame 100 and the rear frame 300 to be assembled in a convenient and quick manner. By symmetrically distributing two integrated connecting frames 5 of one integrated connecting frame group on both sides of the front frame 200, and symmetrically distributing two integrated connecting frames 5 of the other integrated connecting frame group on both sides of the rear frame 300, the two integrated connecting frames 5 corresponding to the front frame 200 are distributed close to the two ends in the vehicle width direction, and the two integrated connecting frames 5 corresponding to the rear frame 300 are also distributed close to the two ends in the vehicle width direction. This allows the first connecting part 54 integrated on the connecting body to effectively correspond to the mudguard's setting position, the second connecting part 55 integrated on the connecting body to effectively correspond to the leaf spring's setting position, and the third connecting part 56 integrated on the connecting body to effectively correspond to the cab floor assembly 400's setting position, facilitating the integration of the mudguard, leaf spring, and cab floor assembly 400 on the frame assembly. Secondly, by integrating the first integration part 51, the second integration part 52, and the third integration part 53 into the connecting body, compared with the prior art, it is not necessary to separately set up a bracket for connecting the mudguard on the frame assembly, nor is it necessary to separately set up a bracket for connecting the leaf spring on the frame assembly, nor is it necessary to separately set up a bracket for connecting the cab floor assembly 400 on the frame assembly. This can effectively improve the integration of the frame assembly, simplify the structure of the frame assembly, reduce the number of parts, make the frame assembly lightweight, reduce production and processing costs, and improve assembly and disassembly efficiency.

[0084] Among them, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the connecting body includes a first connecting part 54 and a second connecting part 55 that are vertically distributed and connected to each other. The first connecting part 54 is used to connect with the longitudinal beam 4 of the frame, and the second connecting part 55 is used to connect with the middle frame 100. Specifically, the second connecting part 55 is used to connect with the crossbeam end plate 11 of the middle frame 100, so as to enable the front frame 200, the middle frame 100 and the rear frame 300 to be assembled.

[0085] In this embodiment, the bolt passes through the first connecting part 54 and the longitudinal beam 4 of the frame and is threaded to the nut to achieve a detachable and fixed connection between the first connecting part 54 and the longitudinal beam 4 of the frame. The bolt passes through the second connecting part 55 and the crossbeam end plate 11 and is threaded to the nut to achieve a detachable and fixed connection between the second connecting part 55 and the crossbeam end plate 11.

[0086] Preferably, such as Figure 8As shown, the integrated connecting frame 5 also includes a first reinforcing rib 57, the two connecting ends of which are respectively connected to the first connecting part 54 and the second connecting part 55. This improves the reliability of connecting the frame longitudinal beam 4 and the center frame 100 through the connecting body.

[0087] More preferably, there are multiple first reinforcing ribs 57, and the multiple first reinforcing ribs 57 are distributed at intervals along the height direction of the vehicle. In this embodiment, as... Figure 8 As shown, preferably, there are two first reinforcing ribs 57, which are located at both ends of the first connecting part 54 along the height direction of the vehicle. This arrangement not only further improves the reliability of connecting the frame longitudinal beam 4 and the middle frame 100 through the connecting body, but also leaves enough space to connect the first connecting part 54 and the frame longitudinal beam 4 with bolts and lock nuts, and also leaves enough space to connect the second connecting part 55 and the crossbeam end plate 11 with bolts and lock nuts, facilitating assembly and disassembly operations.

[0088] Specifically, such as Figure 8 As shown, the connecting body also includes a third connecting part 56, which is connected at the corner of the first connecting part 54 and the second connecting part 55, and is located below the first connecting part 54 and the second connecting part 55 along the height direction of the vehicle. The third connecting part 56 is also used to connect with the center frame 100, and the third connecting part 56 and the second connecting part 55 form a "U"-shaped connection structure. Specifically, the third connecting part 56 is used to connect with the crossbeam end plate 11 of the center frame 100. By setting the third connecting part 56, the connection area between the connecting body and the crossbeam end plate 11 can be effectively increased, thereby further improving the reliability of connecting the frame longitudinal beam 4 and the center frame 100 through the crossbeam end plate 11. Secondly, the third connecting part 56 is connected at the corner of the first connecting part 54 and the second connecting part 55, and forms a "U"-shaped connection structure with the second connecting part 55, which can improve the support performance of the frame longitudinal beam 4, thereby further improving the structural strength and reliability of the frame assembly. In this embodiment, the bolt passes through the third connecting part 56 and the crossbeam end plate 11 and is threaded to the nut to achieve a detachable and fixed connection between the third connecting part 56 and the crossbeam end plate 11.

[0089] Specifically, such as Figure 8 As shown, along the height direction of the vehicle, the lower end of the second connecting portion 55 and / or the lower end of the third connecting portion 56 are both integrated with the first integrating portion 51. It can be understood that the wheels are distributed near the two ends in the width direction of the vehicle, so the first integrating portion 51 is provided at the lower end of the second connecting portion 55 and / or the lower end of the third connecting portion 56 to effectively correspond to the distribution position of the wheels.

[0090] In this embodiment, as Figure 8As shown, preferably, the lower ends of the second connecting portion 55 and the third connecting portion 56 are both provided with a first integrating portion 51. This arrangement can improve the connection reliability of the mudguard to the integrated connecting frame 5 and effectively alleviate the mudguard vibration phenomenon when the vehicle is idling. The specific structure of the mudguard is prior art and will not be described in detail here.

[0091] In this embodiment, the mudguard and the lower end of the second connecting portion 55 are connected by bolts and nuts, and the mudguard and the lower end of the third connecting portion 56 are also connected by bolts and nuts. This integrates the mudguard into the second connecting portion 55 and the third connecting portion 56. It is understood that the reliability of the integration into the second connecting portion 55 and the third connecting portion 56 can be further improved by increasing the number of bolts and nuts.

[0092] Specifically, such as Figure 8 As shown, along the height direction of the vehicle, the second integration part 52 is integrated at the lower end of the first connecting part 54. It can be understood that the leaf springs are distributed below the frame assembly, so the second integration part 52 is integrated at the lower end of the first connecting part 54 to effectively correspond to the distribution position of the leaf springs.

[0093] In this embodiment, as Figure 8 As shown, the integrated connecting frame 5 also includes a second reinforcing rib 58, whose three connecting ends are respectively connected to the first connecting portion 54 and two first reinforcing ribs 57. Along the height direction of the vehicle, the second integrated portion 52 is connected to the connection point between the second reinforcing rib 58 and one of the lower first reinforcing ribs 57. This arrangement integrates the second integrated portion 52 into the lower end of the first connecting portion 54 and improves the reliability of connecting the leaf spring via the second integrated portion 52. The specific structure of the leaf spring is prior art and will not be described in detail here.

[0094] Specifically, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the third integration unit 53 is integrated into the upper end of the connecting body along the height direction of the vehicle. It can be understood that the vehicle cab is located above the frame assembly, so the third integration unit 53 is integrated into the upper end of the connecting body to effectively correspond to the distribution position of the cab floor assembly 400.

[0095] In this embodiment, along the height direction of the vehicle, such as Figure 8As shown, the third integration part 53 is integrated onto a first reinforcing rib 57 located above. This integrates the third integration part 53 onto the upper end of the connecting body. This arrangement further improves the integration of the chassis assembly, effectively reduces the number of parts, further lightens the chassis assembly, and further improves assembly and disassembly efficiency. The specific structure of the cab floor assembly 400 is prior art and will not be described in detail here.

[0096] More specifically, such as Figure 2 , Figure 7 and Figure 8 As shown, the third integrated part 53 is provided with a first connecting hole, and the cab floor assembly 400 is provided with a second connecting hole 410; an elastic bushing 6 is fixedly provided on one of the inner peripheral walls of the first connecting hole and the second connecting hole 410; a first connecting member passes through the elastic bushing 6 and the other of the first and second connecting holes 410, and is connected to a first locking member. This achieves the connection between the third integrated part 53 and the cab floor assembly 400; wherein, by providing the elastic bushing 6, the elastic bushing 6 can buffer and dampen vibration when the vehicle is traveling on bumpy roads.

[0097] In this embodiment, the elastic bushing 6 is made of rubber. In other embodiments, the elastic bushing 6 may also be made of other elastic materials.

[0098] In this embodiment, the elastic bushing 6 is fixedly disposed within the first connecting hole. As an alternative, the elastic bushing 6 may also be disposed within the second connecting hole 410.

[0099] In this embodiment, the first connecting member is exemplarily set as a bolt, the first locking member is a nut, and the number of second connecting holes 410 is two. The bolt passes through one of its second connecting holes 410, the elastic bushing 6 and the other second connecting hole 410 in sequence and is threadedly connected to the nut to realize the detachable fixed connection between the third integrated part 53 and the cab floor assembly 400.

[0100] Preferably, the first connecting portion 54, the second connecting portion 55, the third connecting portion 56, the first reinforcing rib 57, the second reinforcing rib 58, the first integrating portion 51, the second integrating portion 52, and the third integrating portion 53 of the integrated connecting frame 5 are all integrally formed. This arrangement can further improve the structural strength of the integrated connecting frame 5, reduce the number of parts, and facilitate assembly and disassembly.

[0101] Among them, such as Figure 1 , Figure 2 and Figure 7As shown, the vehicle frame assembly also includes two reinforcing structure groups, with each reinforcing structure 7 corresponding to the front frame 200 and the rear frame 300 respectively. In one reinforcing structure group, the two reinforcing structures 7 are located between the two longitudinal beams 4 of the front frame 200 and correspond to each other; in the other reinforcing structure group, the two reinforcing structures 7 are located between the two longitudinal beams 4 of the rear frame 300 and correspond to each other.

[0102] Specifically, such as Figure 1 , Figure 2 , Figure 7 and Figure 9 As shown, the reinforcing structure 7 includes a first reinforcing member 71, which comprises a first reinforcing portion 711 and a second reinforcing portion 712 that are vertically distributed and connected. The first reinforcing portion 711 is used to connect with the frame longitudinal beam 4, and the second reinforcing portion 712 is used to fixably connect with the crossbeam end plate 11. This further improves the reliability of the connection between the frame longitudinal beam 4 and the center frame 100. In this embodiment, bolts pass through the first reinforcing portion 711, the frame longitudinal beam 4, and the first connecting portion 54 and are threadedly connected to nuts. This allows for the detachable fixing of both the first connecting portion 54 and the first reinforcing portion 711 to the frame longitudinal beam 4, while reducing the number of bolts and nuts. Bolts pass through the second reinforcing portion 712 and the crossbeam end plate 11 and are threadedly connected to nuts, thereby achieving a detachable fixing of the second reinforcing portion 712 and the crossbeam end plate 11.

[0103] Optionally, such as Figure 9 As shown, the first reinforcing part 711 and / or the second reinforcing part 712 are provided with weight-reducing grooves 714. This reduces the weight of the first reinforcing member 71, thereby making the frame assembly lighter. In this embodiment, both the first reinforcing part 711 and the second reinforcing part 712 are provided with weight-reducing grooves 714.

[0104] Preferably, such as Figure 9 As shown, a third reinforcing rib 713 is provided between the first reinforcing part 711 and the second reinforcing part 712. This can improve the structural strength of the first reinforcing member 71. Optionally, there are multiple third reinforcing ribs 713, which are spaced apart along the height direction of the vehicle to further improve the structural strength of the first reinforcing member 71. In this embodiment, as... Figure 9 As shown, the exemplary configuration includes two third reinforcing ribs 713, which are located at both ends of the first reinforcing part 711 along the height direction of the vehicle.

[0105] Preferably, the first reinforcing part 711, the second reinforcing part 712, and the third reinforcing rib 713 of the first reinforcing member 71 are integrally formed to further improve the structural strength of the first reinforcing member 71.

[0106] Specifically, in this embodiment, as Figure 1 , Figure 2 and Figure 7 show, the longitudinal beam 4 of the vehicle frame is in a "C" shape. The reinforcement structure 7 further includes two second reinforcement members 72 in an "L" shape, and the two second reinforcement members 72 are respectively fixedly connected to two corners of the longitudinal beam 4 of the vehicle frame to further enhance the structural strength of the longitudinal beam 4 of the vehicle frame. Among them, in this embodiment, the second reinforcement member 72 is exemplarily set as a second angle iron extending along the length direction of the longitudinal beam 4 of the vehicle frame. Bolts pass through the second angle iron and the longitudinal beam 4 of the vehicle frame and are threadedly connected with nuts to detachably fix and connect the second angle iron and the longitudinal beam 4 of the vehicle frame. As an alternative solution, the thickness of the two corners of the longitudinal beam 4 of the vehicle frame can also be increased.

[0107] Among them, the vehicle frame assembly further includes a boarding ladder, which is integrated into the middle vehicle frame 100 and distributed outside the middle vehicle frame 100 along the width direction of the vehicle, facilitating the driver to climb onto the middle vehicle frame 100.

[0108] Specifically, as Figure 1-3 and Figure 10-11 show, at least one of the tops of the two longitudinal beam end plates 13 distributed along the third direction is connected with a second connecting member 8, and the boarding ladder is connected to the second connecting member 8 and distributed outside the middle vehicle frame 100 along the width direction of the vehicle to integrate the boarding ladder into the middle vehicle frame 100; among them, since one end of the second connecting member 8 is connected to the top of the longitudinal beam end plate 13 distributed at the top, the reliability of connecting the boarding ladder to the middle vehicle frame 100 can be effectively improved.

[0109] In this embodiment, as Figure 10-11 show, an avoidance hole 31 is formed between the splicing parts of the top protection plate 2 and the side protection plate 3. One end of the second connecting member 8 passes through the avoidance hole 31 and is connected to the top of the longitudinal beam end plate 13 distributed at the top, and the other end is detachably connected to the boarding ladder. Among them, the second connecting member 8 is detachably connected to the top of the longitudinal beam end plate 13 distributed at the top through screws and is detachably connected to the boarding ladder through screws.

[0110] In this embodiment, as Figure 10-11 show, the second connecting member 8 is a casting roughly in an arc shape, which can be adapted to the installation position of the second connecting member 8.

[0111] Optionally, as Figure 1-3 show, the number of the second connecting members 8 is multiple, and the multiple second connecting members 8 are distributed at intervals along the length direction of the vehicle on the middle vehicle frame 100, enabling the setting number and position of the boarding ladder to be adjusted adaptively according to the actual working conditions; secondly, it is also convenient to integrate other structures into the middle vehicle frame 100.

[0112] Furthermore, to prevent rainwater and / or debris from entering the containment space.

[0113] like Figure 11 As shown, the top guard plate 2 is provided with a first sealing strip 91 along the circumference. The first sealing strip 91 is used to seal the gap between the top guard plate 2 and the two longitudinal beam end plates 13 distributed on the top, and to seal the gap between the top guard plate 2 and the two transverse beam end plates 11.

[0114] like Figure 11 As shown, the side guard plate 3 is provided with two second sealing strips 92. One second sealing strip 92 is used to seal the gap between the side guard plate 3 and a longitudinal beam end plate 13 located at the top, and the other second sealing strip 92 is used to seal the gap between the side guard plate 3 and a longitudinal beam end plate 13 located at the bottom. This is to further prevent rainwater and / or debris from entering the accommodating space.

[0115] Preferably, such as Figure 10-11 As shown, the side guard plate 3 is provided with drainage holes 32, which are located between the first sealing strip 91 and a second sealing strip 92 distributed along the height direction of the vehicle at the top of the side guard plate 3. It can be understood that the drainage holes 32 are relatively far from the first sealing strip 91 relative to the clearance holes 31. By providing the drainage holes 32, water accumulation in the gap between the first sealing strip 91 and the second sealing strip 92 distributed along the height direction of the vehicle at the top of the side guard plate 3 is prevented from causing sealing failure of the first sealing strip 91 and / or the second sealing strip 92.

[0116] Among them, such as Figure 2 As shown, the frame assembly also includes a support structure 10, which is integrated into the top of the mid-frame 100 and extends at least partially beyond the top guard plate 2 of the mid-frame 100. When the driver climbs onto the mid-frame 100, he stands on the support structure 10, preventing him from stepping on the top guard plate 2 or even damaging the battery.

[0117] In this embodiment, as Figure 1 , Figure 2 and Figure 10 As shown, the exemplary support structure 10 includes two first support plates 101 and a plurality of second support plates 102 connected between the two first support plates 101. The plurality of second support plates 102 are spaced apart along the length direction of the first support plates 101. The two ends of the first support plates 101 along the length direction are detachably connected to two longitudinal beam end plates 13 distributed at the top. The length direction of the first support plates 101 is parallel to the width direction of the vehicle. When the driver climbs onto the mid-frame 100, he stands on the second support plates 102 to avoid damaging the mid-frame 100 or even the battery. The two ends of the first support plates 101 along the length direction are detachably connected to the two longitudinal beam end plates 13 distributed at the top by screws.

[0118] In this embodiment, as Figure 1 , Figure 2 and Figure 10 As shown, the second support plate 102 is located above the top guard plate 2. The first support plate 101 is located below the top guard plate 2, that is, the first support plate 101 is located within an accommodating space at the top. When the driver climbs onto the center frame 100, he stands on the second support plate 102. As an alternative, the second support plate 102 is located above the top guard plate 2, and the first support plate 101 extends partially or completely beyond the top guard plate 2.

[0119] In other embodiments, the thickness of the top guard plate 2 can also be increased to prevent the driver from stepping on the middle frame 100 or even damaging the battery.

[0120] The present invention also provides a pure e-commerce vehicle, including the aforementioned vehicle frame assembly.

[0121] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mid-frame, characterized in that, Includes a center frame body, the center frame body comprising: The crossbeam structure includes two crossbeam end plates (11) that are opposite to each other and spaced apart along a first direction, the crossbeam end plates (11) being used to connect with the frame longitudinal beams (4); The longitudinal beam structure includes a longitudinal beam base plate (12) and two longitudinal beam end plates (13) that are opposite to each other and spaced apart along a second direction. The longitudinal beam base plate (12) is connected to two crossbeam end plates (11) at both ends along the first direction, and the longitudinal beam end plates (13) are connected to two crossbeam end plates (11) at both ends along the first direction. The longitudinal beam base plate (12) is connected to two longitudinal beam end plates (13) at both ends along the second direction. An accommodating space is formed between the longitudinal beam base plate (12), the two crossbeam end plates (11), and the two longitudinal beam end plates (13), and the accommodating space is used to accommodate a battery. The first direction is perpendicular to the second direction. The longitudinal beam bottom plate (12) includes multiple sub-bottom plates (121). One of any two adjacent sub-bottom plates (121) is provided with a wedge-shaped groove (1211) extending along the first direction, and the other is provided with a wedge-shaped column (1212) extending along the first direction. The wedge-shaped column (1212) is inserted into the wedge-shaped groove (1211). The sub-base plate (121) is provided with a temperature regulating chamber (1213) and a weight reduction chamber. The temperature regulating chamber (1213) and the weight reduction chamber are distributed at intervals along the thickness direction of the sub-base plate (121), and the temperature regulating chamber (1213) is closer to the battery bearing surface of the sub-base plate (121) relative to the weight reduction chamber. The crossbeam end plate (11) includes an inner end plate (111), an outer end plate (112), and a reinforcing frame (113) fixedly disposed between the inner end plate (111) and the outer end plate (112) along the first direction; the longitudinal beam bottom plate (12) is connected to the two inner end plates (111) at both ends along the first direction, and the longitudinal beam end plate (13) is connected to the two inner end plates (111) at both ends along the first direction; the outer end plate (112) is used to connect to the frame longitudinal beam (4); The thickness of the inner end plate (111) is less than the thickness of the outer end plate (112).

2. The mid-frame according to claim 1, characterized in that, The number of longitudinal beam structures is multiple, and the multiple longitudinal beam structures are distributed sequentially along a third direction. The first direction is perpendicular to the second direction and both are perpendicular to the third direction. Along the third direction, the top end of the longitudinal beam end plate (13) of the longitudinal beam structure distributed at the top is flush with the top end of the transverse beam end plate (11), and the bottom end of the longitudinal beam end plate (13) of the longitudinal beam structure distributed at the bottom is flush with the bottom end of the transverse beam end plate (11).

3. The mid-frame according to claim 1, characterized in that, Each of the two crossbeam end plates (11) has a support boss (1111) on its close end face. The two ends of the longitudinal beam bottom plate (12) are connected to the two support bosses (1111) in a corresponding manner along the first direction. The two ends of the longitudinal beam bottom plate (12) are connected to the two support bosses (1111) in a corresponding manner along the first direction.

4. The mid-frame according to claim 3, characterized in that, The longitudinal beam bottom plate (12) is provided with multiple positioning holes, and the trolley frame body also includes multiple positioning pins. The multiple positioning pins are arranged in a one-to-one correspondence with the multiple positioning holes, and the positioning pins are inserted into the support boss (1111) through the positioning holes.

5. The mid-frame according to claim 1, characterized in that, The thickness of the inner end plate (111) ranges from 2mm to 5mm; the thickness of the outer end plate (112) ranges from 15mm to 25mm.

6. A frame assembly, characterized in that, Includes the midframe as described in any one of claims 1-5.

7. Pure e-commerce vehicle, characterized in that, Includes the frame assembly as described in claim 6.

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