CN115285223A - Vehicle body framework, lower vehicle body structure design method and pure electric vehicle - Google Patents

Abstract

The invention belongs to the technical field of electric vehicle bodies, and in particular relates to a body structure, a design method for a lower body structure, and a pure electric vehicle, comprising: a platform universal module, wherein the platform universal module includes a lower body frame; a battery pack is installed in the lower body frame; The position adjustment unit is located above the battery pack on the inner side of the lower body frame, and the height of the position adjustment unit varies with the thickness of the battery pack, so as to make the relative position between the position adjustment unit and the top surface of the battery pack constant. The invention takes the lower boundary of the battery pack as the design basis, and the periphery of the body frame is designed as a lap/sealing surface, so that the lower floor of the body and the body frame can ensure the lap relationship in the Z direction. This scheme will increase the passenger space for thinner battery packs; for thicker battery packs, it will make full use of the ground clearance; for the extended CTB scheme, the lap edge of the body frame becomes the sealing surface with the battery pack. At the same time, the generalization of the lower body is also guaranteed to a large extent.

Description

A body structure, a design method for a lower body structure, and a pure electric vehicle

technical field

The invention belongs to the technical field of electric vehicle bodies, and in particular relates to a body structure, a design method for a lower body structure and a pure electric vehicle.

Background technique

The design of the traditional car body is mostly based on the floor surface of the car body. For battery packs of different thicknesses, there is a situation that the Z-direction space cannot be fully utilized. For pure electric cars, a lower vehicle height is required to meet the needs of sporty styling, and the battery pack thickness needs to be as low as possible; for pure electric SUVs, the battery pack thickness is increased to increase the power and ensure the cruising range . However, the existing platform body structure cannot be compatible with battery packs of different thicknesses. For battery packs of different thicknesses/types, the Z-direction space of the vehicle cannot be fully utilized, or a large change in the body structure is required.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a vehicle body structure that can improve the versatility of the lower body, a design method for the lower body structure, and a pure electric vehicle.

In order to achieve the above purpose and other related purposes, the present invention provides a vehicle body structure, comprising:

a platform common module, the platform common module includes a lower body frame;

The battery pack is installed in the lower body frame, and the relative position between the bottom surface of the battery pack and the lower body frame is a constant value;

The position adjustment unit is located above the battery pack inside the lower body frame, and the height of the position adjustment unit changes with the thickness of the battery pack, so that the position adjustment unit and the top of the battery pack The relative positions between faces remain the same.

In an optional embodiment of the invention, the lower body frame includes:

Threshold beams are placed on both sides in the width direction of the lower body frame;

a front crossbeam, located on the front side of the lower body frame, the front crossbeam is perpendicular to the threshold beam, and the two ends of the front crossbeam are respectively connected to the front ends of the two threshold beams;

The rear cross beam is located at the rear side of the lower body frame, the rear cross beam is parallel to the front cross beam, and the two ends of the rear cross beam are respectively connected to the rear ends of the two threshold beams.

In an optional embodiment of the invention, the position adjustment unit includes an overlapping surface provided on the inner wall of the lower body frame opposite to the side wall of the battery pack, and the overlapping surface extends from the inner wall to the side wall of the battery pack. The installation area of the battery pack is overhanging.

In an optional embodiment of the invention, the overlapping surface includes:

a side lap on the inside of said rocker beam, and/or

a front lap on the inside of said front cross member, and/or

The rear lap surface located on the inner side of the rear cross member.

In an optional embodiment of the invention, a lower floor is further included, and the lower floor is overlapped above the position adjustment unit.

In an optional embodiment of the invention, the overlapping surfaces are continuously distributed along the length direction of the sill beam, the front beam and the rear beam.

In an optional embodiment of the invention, the battery pack and the lower vehicle body frame are packaged using CTB technology, and a sealant is provided between the overlapping surface and the edge of the top surface of the battery pack.

In an optional embodiment of the invention, the edge of the bottom surface of the battery pack is provided with a flange cantilevered to the outside of the side wall of the battery pack, and the flange is connected to the bottom surface of the lower body frame through a connecting piece , the thickness of the flange is a constant value.

In order to achieve the above purpose and other related purposes, the present invention also provides a method for designing the lower body structure, which includes the following steps:

providing a platform common module, said platform common module including a lower body frame;

Acquiring battery pack assembly parameters, the battery pack assembly parameters at least including the thickness of the battery pack, and the relative position between the bottom surface of the battery pack and the lower body frame after the battery pack is assembled with the lower body frame;

determining the height of the overlapping surface according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the lower body frame;

Depending on the height of the landing surface, the landing surface is provided on the inner side of the lower body frame.

In an optional embodiment of the invention, the step of determining the height of the overlapping surface according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the lower body frame includes:

determining the height of the top surface of the battery pack according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the lower body frame;

The height of the overlapping surface is determined according to the height of the top surface of the battery pack, so that the distance between the overlapping surface and the top surface of the battery pack is within a preset threshold.

In an optional embodiment of the invention, the following steps are also included:

A subfloor is provided with its edge overlapping the upper end of the overlapping surface.

In an optional embodiment of the invention, the following steps are also included:

The battery pack and the lower body frame are packaged using CTB technology, and a sealant is provided between the edge of the top surface of the battery pack and the overlapping surface.

To achieve the above purpose and other related purposes, the present invention also provides a pure electric vehicle, including the above-mentioned body structure.

The technical effect of the present invention is that: the present invention is based on the design of the lower boundary of the battery pack, and the periphery of the body frame is designed as an overlapping/sealing surface, so that the lower floor of the vehicle body and the body frame can ensure the overlapping relationship in the Z direction. Through the up and down movement of the overlapping surface, the body frame is matched with the lower floor surface/battery pack. This solution will increase the occupant space for thinner battery packs; for thicker battery packs, it will make full use of the ground clearance; for the expanded CTB solution, the overlapping edge of the body frame will become the sealing surface with the battery pack, Simultaneously, the generalization of the lower body is guaranteed to a large extent.

Description of drawings

Fig. 1 is the top view of the lower body frame provided by the embodiment of the present invention;

Fig. 2 is the exploded view of the lower vehicle body provided by the embodiment of the present invention;

Fig. 3 is the assembly diagram of the lower vehicle body provided by the embodiment of the present invention;

Fig. 4 is a sectional view of the threshold beam provided by the embodiment of the present invention;

Fig. 5 is a sectional view of the front beam provided by the embodiment of the present invention;

Fig. 6 is a sectional view of the rear beam provided by the embodiment of the present invention;

Fig. 7 is a perspective view of a battery pack in a CTB packaging solution provided by an embodiment of the present invention;

Fig. 8 is a cross-sectional view of the threshold beam in the CTB packaging solution provided by the embodiment of the present invention;

Fig. 9 is a flow chart of the lower body design method provided by the embodiment of the present invention;

Fig. 10 is a flowchart of a method for determining the height of an overlapping surface provided by an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and number of components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Please refer to Fig. 1-8, which is a lower body structure realized based on the body structure of the present invention. For a specific vehicle body structure, in some specific embodiments, the lower vehicle body structure can be appropriately modified within the boundaries defined by the vehicle body structure of the present invention, for example, the thickness of the battery pack can be increased or decreased. Under certain circumstances, the height of the position adjustment unit of the present invention should also be changed accordingly.

Please refer to Figures 1-8, the body structure includes a platform general module, a battery pack 20 and a position adjustment unit, specifically:

Please refer to Figs. 1-3, the common module of the platform includes the lower body frame 10; it can be understood that the common module of the platform can be used universally on various models of the same platform, thereby greatly reducing design and manufacturing costs , the common platform module includes but not limited to the lower body frame 10, for example, the common platform module may also include other common structures such as lower floor, front floor assembly, rear frame assembly and the like.

Please refer to Figures 2, 4-8, the battery pack 20 is installed in the lower body frame 10, and the relative position between the bottom surface of the battery pack 20 and the lower body frame 10 is a fixed value; It is understood that the bottom surface of a battery pack 20 in the present invention is used as the design basis, and in the body design process of different models, it can avoid making too many changes to the overall structure of the lower body. When facing different models, only the top surface of the battery pack 20 The height of the surface will change. At this time, as long as the position of the lower floor is changed appropriately, the compatibility of the lower body on various models can be realized. It should be noted that, the specific packaging method of the battery pack 20 of the present invention is not particularly limited, for example, CTP, CTC or CTB technology can be used for packaging, which further improves the compactness and versatility of the lower body structure.

Please refer to FIGS. 1-6 , the position adjustment unit is located above the battery pack 20 inside the lower body frame 10 , and the height of the position adjustment unit varies with the thickness of the battery pack 20 . In order to keep the relative position between the position adjustment unit and the top surface of the battery pack 20 unchanged. First of all, it needs to be explained that the relative position between the position adjustment unit of the present invention and the top surface of the battery pack 20 remains unchanged, and certain errors should be allowed, rather than remain absolutely unchanged in a mathematical sense; it is understandable Yes, when the lower body is applied to different models, since the overall structure of the lower body is designed based on the bottom surface of the battery pack 20, most of the bottom-up structure of the lower body does not need to be changed, but only needs to be changed according to the battery pack. The thickness of 20 can change the height of the position adjustment unit.

The position adjustment unit is mainly used to control the height of the floor of the passenger compartment, and flexibly adjusts the height of the floor according to the thickness of the battery pack 20, so that the space of the vehicle body can be fully utilized; in different packaging methods, the specific usage of the position adjustment unit is also different. Similarly, for example, when adopting CTP or CTC packaging, there is a separate lower floor structure, at this time, the position adjustment unit is used to support and fix the lower floor, while when adopting CTB packaging, the top surface of the battery pack 20 directly serves as The lower floor, at this time, the position adjustment unit is mainly used to seal the edge of the battery pack 20 .

The present invention can carry battery packs 20 of different thicknesses through minor modifications, improve the generalization rate of the vehicle body, maximize the use of Z-direction space, and take into account the expansion of subsequent CTB technology.

Please refer to FIGS. 1-6, in a specific embodiment, the lower body frame 10 includes a door sill beam 11, a front cross member 12 and a rear cross member 13; direction; the front cross beam 12 is located at the front side of the lower body frame 10, the front cross beam 12 is perpendicular to the threshold beam 11, and the two ends of the front cross beam 12 are respectively connected to the two threshold beams The front end of 11 is connected; the rear cross beam 13 is located at the rear side of the lower body frame 10, the rear cross beam 13 is parallel to the front cross beam 12, and the two ends of the rear cross beam 13 are respectively connected to the two threshold beams 11 backend connections.

It can be understood that there are no special restrictions on the molding methods of the threshold beam 11, the front beam 12 and the rear beam 13, for example, they can be formed by extruding aluminum profiles in one piece, or welded by a plurality of steel stamping parts. The threshold beam 11, the front beam 12 and the rear beam 13 are hollow structures, and necessary reinforcing ribs 112, 122, 132 are provided in their respective cavities. When the threshold beam 11, the front beam 12 and the rear beam 13 are made of extruded aluminum When the profile is made, the reinforcing ribs 112, 122, 132 can be integrally extruded with the threshold beam 11, the front beam 12 and the rear beam 13 respectively, when the threshold beam 11, the front beam 12 and the rear beam 13 have steel When the stamping parts are welded, the reinforcing ribs 112, 122, 132 can be stamped and formed separately, and then welded and fixed with the threshold beam 11, the front beam 12 and the rear beam 13 respectively.

Please refer to FIGS. 1-6 , in a specific embodiment, the position adjustment unit includes an overlapping surface provided on the inner wall of the lower body frame 10 opposite to the side wall of the battery pack 20 , the The overlapping surface is suspended from the inner wall to above the installation area of the battery pack 20; in a specific embodiment, the overlapping surface includes: a side overlapping surface 111 located inside the door sill beam 11, The front overlapping surface 121 located inside the front beam 12 and the rear overlapping surface 131 located inside the rear beam 13 . It can be understood that, for example, the overlapping surface can also be distributed only in some areas of the lower body frame 10, for example, it is only arranged on the door sill beam 11 or only on the front cross member 12 and the longitudinal beam. For overall support strength, it is preferable to continuously distribute the lap joint over the entire edge of the lower body frame 10 .

Please refer to FIGS. 1-6 , in the CTP or CTC package solution, a lower floor 30 is also included, and the lower floor 30 is overlapped above the position adjustment unit. In a specific embodiment, for example, the lower floor 30 can be integrated with the seat beam 31 , and the seat beam 31 can be used as a reinforcing rib of the lower floor 30 to improve the overall structural strength of the lower floor 30 .

Please refer to FIGS. 7 and 8. In the CTB packaging solution, there is no independent lower floor 30 structure, and the top surface of the battery pack 20 is used as the lower floor 30. At this time, the edge of the top surface of the battery pack 20 needs to be sealed. Here, the overlapping surface is continuously distributed along the length direction of the sill beam 11 , the front beam 12 and the rear beam 13 , and a Sealant23.

Please refer to FIGS. 4-8 , in a specific embodiment, the edge of the bottom surface of the battery pack 20 is provided with a flange 21 cantilevered to the outside of the side wall of the battery pack 20, and the flange 21 is connected to A member 22 is connected to the bottom surface of the lower body frame 10, the thickness of the flange 21 is constant, and the connecting member 22 may be, for example, a bolt.

Based on the above-mentioned body structure, the present invention also provides a method for designing a lower body structure, comprising the following steps:

S10: Provide a common platform module, where the common platform module includes the lower body frame 10 .

S20: Obtain assembly parameters of the battery pack 20, the assembly parameters of the battery pack 20 at least include the thickness of the battery pack 20, and the bottom surface of the battery pack 20 and the lower body frame after the assembly of the battery pack 20 and the lower body frame 10 Relative position between 10.

S30: Determine the height of the overlapping surface according to the thickness of the battery pack 20 and the relative position between the bottom surface of the battery pack 20 and the lower body frame 10 .

Specifically, the step S30 includes:

S31: Determine the height of the top surface of the battery pack 20 according to the thickness of the battery pack 20 and the relative position between the bottom surface of the battery pack 20 and the lower body frame 10 .

S32: Determine the height of the overlapping surface according to the height of the top surface of the battery pack 20, so that the distance between the overlapping surface and the top surface of the battery pack 20 is within a preset threshold.

S40: Provide the overlapping surface on the inner side of the lower body frame 10 according to the height of the overlapping surface.

In the CTP or CTC packaging scheme, it also includes:

Step S50: providing the lower floor 30, and making its edge overlap the upper end of the overlapping surface.

In the CTB packaging scheme, it also includes:

Step S60: providing a sealant 23 between the edge of the top surface of the battery pack 20 and the overlapping surface.

The present invention also provides a pure electric vehicle based on the above-mentioned vehicle body structure design.

To sum up, the present invention takes the lower boundary of the battery pack 20 as the design basis, and the periphery of the vehicle body frame is designed as an overlapping/sealing surface, so that the lower floor 30 of the vehicle body and the vehicle body frame can ensure the overlapping relationship in the Z direction. Through the up and down movement of the overlapping surface, the vehicle body frame is matched with the lower floor 30 /battery pack 20 . This solution will increase the occupant space for the thinner battery pack 20; for the thicker battery pack 20, it will make full use of the ground clearance; The sealing surface also ensures the generalization of the lower body to a greater extent.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the invention. However, one skilled in the art will recognize that embodiments of the invention may be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and the like. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention and does not Certainly in all examples. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a particular embodiment" in various places throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics of any particular embodiment of the invention may be combined in any suitable manner with one or more other embodiments. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the invention.

It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or integrated manner, or even removed as inoperable in certain circumstances or as may be useful depending on a particular application. Provided.

In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only, and not limiting. In addition, as used herein, the term "or" is generally intended to mean "and/or" unless stated otherwise. Combinations of parts or steps are also considered to be indicated where terms are foreseen because it is unclear to provide the ability to separate or combine.

As used in the description herein and throughout the claims below, "a," and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise specified.

The above description of illustrated embodiments of the invention, including what is described in the Abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of the invention, and examples for the invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the invention, as those skilled in the art will recognize and appreciate. of. As noted, these modifications can be made to the invention in light of the above description of described embodiments of the invention and will be within the spirit and scope of the invention.

Systems and methods have generally been described herein in detail to facilitate an understanding of the invention. Additionally, various specific details have been given to provide a general understanding of embodiments of the invention. However, one skilled in the relevant art will recognize that the embodiments of the invention may be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, sections, etc. practice. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the invention.

Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, alterations and substitutions are intended to be within the foregoing disclosure, and it should be understood that in some cases, these can be achieved without departing from the scope and scope of the invention as presented. Some features of the invention will be employed without a corresponding use of other features within the spirit of the invention. Accordingly, many modifications may be made to adapt a particular situation or material to the true scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out the invention, but the invention will include those falling within the scope of the appended claims Any and all examples and equivalents within . Accordingly, the scope of the invention is to be determined only by the appended claims.

Claims (13)

1. A vehicle body structure, characterized in that, comprising: a platform common module, the platform common module includes a lower body frame; The battery pack is installed in the lower body frame, and the relative position between the bottom surface of the battery pack and the lower body frame is a constant value; The position adjustment unit is located above the battery pack inside the lower body frame, and the height of the position adjustment unit changes with the thickness of the battery pack, so that the position adjustment unit and the top of the battery pack The relative positions between faces remain the same. 2. The body structure of claim 1, wherein the lower body frame comprises: Threshold beams are placed on both sides in the width direction of the lower body frame; a front crossbeam, located on the front side of the lower body frame, the front crossbeam is perpendicular to the threshold beam, and the two ends of the front crossbeam are respectively connected to the front ends of the two threshold beams; The rear cross beam is located at the rear side of the lower body frame, the rear cross beam is parallel to the front cross beam, and the two ends of the rear cross beam are respectively connected to the rear ends of the two threshold beams. 3. The vehicle body structure according to claim 2, wherein the position adjustment unit comprises an overlapping surface provided on the inner wall of the lower body frame opposite to the side wall of the battery pack, the overlapping surface The surface is overhanging from the inner wall to the installation area of the battery pack. 4. The vehicle body structure according to claim 3, wherein the overlapping surfaces comprise: a side lap on the inside of said rocker beam, and/or a front lap on the inside of said front cross member, and/or The rear lap surface located on the inner side of the rear cross member. 5 . The vehicle body structure according to any one of claims 1 to 4 , further comprising a lower floor, the lower floor overlapping the position adjustment unit. 6 . The vehicle body structure according to claim 3 , wherein the overlapping surface is continuously distributed along the length direction of the rocker beam, the front cross beam and the rear cross beam. 7 . 7. The vehicle body structure according to claim 6, wherein the battery pack and the lower body frame are packaged using CTB technology, and a seal is provided between the overlapping surface and the edge of the top surface of the battery pack glue. 8. The vehicle body structure according to claim 1, wherein the edge of the bottom surface of the battery pack is provided with a flange protruding outward from the side wall of the battery pack, and the flange is connected to the battery pack through a connecting piece. The bottom surface of the lower body frame is connected, and the thickness of the flange is a constant value. 9. A method for designing a lower body structure, comprising the steps of: providing a platform common module, said platform common module including a lower body frame; Acquiring battery pack assembly parameters, the battery pack assembly parameters at least including the thickness of the battery pack, and the relative position between the bottom surface of the battery pack and the lower body frame after the battery pack is assembled with the lower body frame; determining the height of the overlapping surface according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the lower body frame; Depending on the height of the landing surface, the landing surface is provided on the inner side of the lower body frame. 10. The method for designing the lower vehicle body structure according to claim 9, wherein, according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the frame of the lower vehicle body, the value of the overlapping surface is determined. High steps include: determining the height of the top surface of the battery pack according to the thickness of the battery pack and the relative position between the bottom surface of the battery pack and the lower body frame; The height of the overlapping surface is determined according to the height of the top surface of the battery pack, so that the distance between the overlapping surface and the top surface of the battery pack is within a preset threshold. 11. The lower body structure design method according to claim 10, further comprising the steps of: A subfloor is provided with its edge overlapping the upper end of the overlapping surface. 12. The lower body structure design method according to claim 10, further comprising the steps of: The battery pack and the lower body frame are packaged using CTB technology, and a sealant is provided between the edge of the top surface of the battery pack and the overlapping surface. 13. A pure electric vehicle, characterized in that it comprises the vehicle body structure according to any one of claims 1 to 8.

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