Universal lower automobile body assembly, automobile and assembling method of lower automobile body assembly

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a universal lower automobile body assembly, an automobile and an assembling method of the lower automobile body assembly. The lower vehicle body assembly comprises a lower vehicle frame, an adapter bracket, a standard configuration power battery and at least one non-standard configuration power battery, wherein each threshold assembly of the lower vehicle frame is provided with a plurality of first battery fixing point positions; the standard configuration power battery is provided with a first battery mounting point position corresponding to each first battery fixing point position; the switching support is provided with a switching installation point position corresponding to each first battery fixing point position, the switching support is provided with a plurality of second battery fixing point positions, and the non-standard power battery is provided with a second battery installation point position corresponding to each second battery fixing point position. The lower vehicle body assembly can be compatible with the assembly of various power batteries, and meanwhile, the mass center of the whole vehicle cannot be greatly different after the various power batteries are assembled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to a universal lower vehicle body assembly, a vehicle and an assembly method of the lower vehicle body assembly. BACKGROUND

[0002] Most of the current hybrid vehicles use multiple batteries to cover different configurations of multiple vehicle models with different endurance requirements. At the same time, in order to improve the competitiveness of the product and adapt to various user needs, most of the main machine factories use different battery capacities to meet different endurance configurations. Different battery capacities will result in different sizes of battery module boundaries.

[0003] Because the sizes of battery packs with different capacities are usually different, if they are installed on the same lower vehicle body, the differences in the center of gravity of the battery packs will affect the mass center distribution of the vehicle. Therefore, the current hybrid vehicles usually equip a lower frame for different endurance configurations, resulting in waste and repeated development of resources and costs. Some manufacturers place battery modules of different sizes in the same size shell to enable battery packs with different capacities to be installed on the same lower frame. However, this design cannot guarantee that the centers of gravity of battery packs with different capacities coincide after installation, thereby affecting the mass center distribution of the vehicle. SUMMARY

[0004] The first object of the present application is to provide a universal lower vehicle body assembly to solve the technical problem that the existing lower vehicle body assembly cannot be compatible with the assembly of power batteries with different capacities.

[0005] In order to achieve the above-mentioned object, the present application adopts the following technical solutions: A universal lower vehicle body assembly, comprising a lower frame, a power battery and an adapter bracket, the power battery has multiple capacity specifications, and the multiple power batteries include a standard power battery and at least one non-standard power battery, wherein: The lower frame comprises two threshold assemblies which are spaced apart and symmetrically arranged along the Y direction, and each threshold assembly is provided with a plurality of first battery fixing points; The standard power battery is provided with a first battery mounting point corresponding to each first battery fixing point; The adapter bracket is provided with an adapter mounting point corresponding to each first battery fixing point, and the adapter bracket is provided with a plurality of second battery fixing points, and the non-standard power battery is provided with a second battery mounting point corresponding to each second battery fixing point.

[0006] In some embodiments, the adapter bracket comprises two first adapter components arranged symmetrically along the Y direction and a second adapter component and a third adapter component arranged along the X direction, the two first adapter components, the second adapter component and the third adapter component jointly form a mounting space, and the non-standard power battery is arranged in the mounting space.

[0007] In some embodiments, each first adapter component comprises a fixed plate, a sliding plate and a locking structure, the sliding plate is arranged on the fixed plate along the Y direction, and the locking structure is used for locking and releasing the relative position of the fixed plate and the sliding plate; each adapter mounting point is arranged on the fixed plate, and each second battery fixing point is arranged on the sliding plate.

[0008] In some embodiments, the standard power battery comprises a battery body and two connecting flanges, the two connecting flanges are symmetrically connected to the two sides of the battery body along the Y direction, and a plurality of first battery fixing points are arranged on each connecting flange.

[0009] In some embodiments, it further comprises a rear MCU power cable matched with the standard power battery and a power battery two-phase cable matched with the non-standard power battery; The lower frame further comprises two rear longitudinal beams arranged symmetrically along the Y direction, one of the rear longitudinal beams is provided with a rear power cable fixing point for fixing the rear MCU power cable and the power battery two-phase cable.

[0010] In some embodiments, it further comprises an electric air conditioner wire harness matched with the standard power battery, and one of the rocker assemblies on the same side and one of the rear longitudinal beams are respectively provided with an air conditioner wire harness fixing point for fixing the electric air conditioner wire harness.

[0011] In some embodiments, it further comprises a DC charging wire harness assembly, the DC charging wire harness assembly has multiple specifications, and each of the multiple DC charging wire harness assemblies corresponds to one of the multiple power batteries and is matched with the same. The lower frame further comprises a rear floor assembly arranged between the two rocker assemblies, and the rear floor assembly is provided with a charging wire harness fixing point for fixing various DC charging wire harness assemblies.

[0012] In some embodiments, it comprises a front muffler assembly, and the lower frame further comprises two rocker inner panels arranged symmetrically along the Y direction, and one of the rocker inner panels is provided with a fixing hook for fixing the front muffler assembly. And / or, further comprising a fuel tank and oil pump assembly, the lower vehicle frame further comprising a rear seat front cross beam and a rear floor cross beam arranged between the two rocker assemblies, the rear seat front cross beam and the rear floor cross beam are respectively provided with a plurality of fuel tank fixing points for fixing the fuel tank and oil pump assembly; And / or, further comprising a DCDC transformer, the lower vehicle frame further comprising two rear longitudinal beams arranged symmetrically along the Y direction, each of the rear longitudinal beams is provided with a transformer fixing point for fixing the DCDC transformer.

[0013] The second object of the present application is to provide an automobile comprising the universal lower vehicle body assembly of any one of the above.

[0014] The third object of the present application is to provide an assembly method of the lower vehicle body assembly of any one of the above. When the power battery is a standard power battery, the assembly method comprises: connecting the first battery mounting point on the standard power battery and the first battery fixing point on the lower vehicle frame one by one through fasteners. When the power battery is a non-standard power battery, the assembly method comprises: connecting the adapter mounting point on the adapter bracket and the first battery fixing point on the lower vehicle frame one by one through fasteners; marking a gravity reference point on the lower vehicle frame, and marking the gravity center of the non-standard power battery; adjusting the relative position of the second battery fixing point on the adapter bracket and the gravity reference point according to the size relationship between the gravity center of the non-standard power battery and the second battery mounting point; connecting the second battery fixing point on the adapter bracket and the second battery mounting point on the non-standard power battery one by one through fasteners.

[0015] The beneficial effects of the present application are: The present application provides a universal lower vehicle body assembly, an automobile with the lower vehicle body assembly and an assembly method of the lower vehicle body assembly. The universal lower vehicle body assembly comprises a lower vehicle frame, a power battery and an adapter bracket. The power battery has multiple capacity specifications, and the multiple power batteries include a standard power battery and at least one non-standard power battery. The lower vehicle frame comprises two rocker assemblies arranged symmetrically along the Y direction, and each rocker assembly is provided with a plurality of first battery fixing points. The standard power battery is provided with a first battery mounting point corresponding to each first battery fixing point. The adapter bracket is provided with an adapter mounting point corresponding to each first battery fixing point, and the adapter bracket is provided with a plurality of second battery fixing points. The non-standard power battery is provided with a second battery mounting point corresponding to each second battery fixing point.

[0016] The universal lower body assembly provided in this application adds an adapter bracket for non-standard power batteries. The adapter bracket is used to make up for the difference in boundary dimensions between non-standard and standard power batteries. As a result, after power batteries with different boundary dimensions are assembled on the same type of lower frame, the centers of gravity of different types of power batteries are close to coincide. This can keep the center of gravity of the whole vehicle from changing significantly and reduce the impact of replacing different types of power batteries on chassis tuning components. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the lower vehicle assembly equipped with a standard power battery provided in an embodiment of the present invention; Figure 2 A schematic diagram of the lower vehicle assembly equipped with a non-standard power battery provided in an embodiment of the present invention; Figure 3 A bottom view of the lower frame in the lower body assembly provided in an embodiment of the present invention; Figure 4 This is a front view of the lower frame in the lower body assembly provided in an embodiment of the present invention; Figure 5 This is a three-dimensional schematic diagram of the lower frame in the lower body assembly provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the standard power battery structure in the lower body assembly provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a non-standard power battery in the lower body assembly provided in an embodiment of the present invention; Figure 8 A top view of the transfer bracket in the lower body assembly provided in an embodiment of the present invention; Figure 9 A bottom view of the adapter bracket in the lower body assembly provided in an embodiment of the present invention; Figure 10 A three-dimensional schematic diagram of the transfer bracket in the lower body assembly provided in an embodiment of the present invention; Figure 11 for Figure 10 A sectional view drawn in AA; Figure 12 for Figure 10 Enlarged view at point B; Figure 13 A schematic diagram of the front muffler assembly in the lower body assembly provided in an embodiment of the present invention; Figure 14 A schematic diagram of the rear muffler assembly in the lower body assembly provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the fuel tank and fuel pump assembly in the lower body assembly provided in an embodiment of the present invention; Figure 16 A schematic diagram of the DC-DC transformer in the lower body assembly provided in this embodiment of the invention. Figure 1 ; Figure 17 for Figure 16 A diagram from another angle; Figure 18 This is a schematic diagram of the rear MCU power cable in the lower body assembly provided in an embodiment of the present invention; Figure 19 A schematic diagram of the DC charging harness assembly in the lower body assembly provided in an embodiment of the present invention; Figure 20 This is a schematic diagram of the electric air conditioning wiring harness in the lower body assembly provided in an embodiment of the present invention; Figure 21 This is a schematic diagram showing the positions of the center of gravity reference point and the second battery fixing point in the assembly method of the lower body assembly provided in this embodiment of the invention. Figure 22 This is a schematic diagram showing the position of the center of gravity of the non-standard power battery and the second battery mounting point in the assembly method of the lower body assembly provided in this embodiment of the invention.

[0019] icon: 1-Lower frame; 11-Sill assembly; 12-First battery mounting point; 13-Front floor body; 14-Rear seat front crossbeam; 15-Third battery mounting point; 16-Sill inner panel; 17-Fixing hook; 18-Rear floor crossbeam; 19-Fuel tank mounting point; 120-Rear longitudinal beam; 121-Transformer mounting point; 122-Rear power cable mounting point; 123-Air conditioning wiring harness mounting point; 124-Rear floor assembly; 125-Charging wiring harness mounting point; 126-Fuel pipe mounting point; 2-Power battery; 2a-Standard power battery; 21a-First battery mounting point; 22a-Third battery mounting point; 23a-Battery body; 24a-Connecting flange; 2b-Non-standard power battery; 21b-Second battery mounting point; 3-Adapter bracket; 31-Adapter mounting point; 32-Second battery fixing point; 33-First adapter component; 331-Fixing plate; 332-Sliding plate; 333-Slide groove; 334-Slider; 34-Second adapter component; 35-Third adapter component; 41-Front muffler assembly; 411-Hook; 42-Rear muffler assembly; 421-Flat tube; 422-Round tube; 5-Fuel tank and fuel pump assembly; 51-Angled groove; 52-Fuel tank mounting hole; 6-DC-CDC transformer; 61-On-board charging CDU assembly; 62-CDU main frame bracket; 63-DC-CDC transformer heat insulation plate; 64-First transformer mounting hole; 65-Second transformer mounting hole; 66-Transformer socket; 7a - Rear MCU power cable; 71a - Cable harness clip; 7b - Two-phase cable for power battery; 8-DC charging harness assembly; 81-First charging harness mounting hole; 82-Second charging harness mounting hole; 9a - Electric air conditioner wiring harness; 91a - Air conditioner wiring harness mounting hole; 92a - Wiring harness cable tie; 10 - Front MCU power cable. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] It should be noted that in the description of this invention, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] To address the technical problem of existing lower body assemblies being incompatible with the assembly of power batteries of different capacities, a first aspect of the present invention provides a universal lower body assembly, referring to... Figure 1 andFigure 2 The universal lower body assembly includes a lower frame 1, a power battery 2, and an adapter bracket 3. The power battery 2 has various capacity specifications, including a standard power battery 2a and at least one non-standard power battery 2b, wherein: The lower frame 1 includes two sill assemblies 11 that are spaced apart and symmetrically arranged along the Y direction, and each sill assembly 11 is provided with a number of first battery fixing points 12. The standard power battery 2a is provided with a first battery mounting point 21a corresponding to the position of each first battery fixing point 12; The adapter bracket 3 has an adapter mounting point 31 corresponding to each first battery fixing point 12. The adapter bracket 3 has several second battery fixing points 32. The non-standard power battery 2b has a second battery mounting point 21b corresponding to each second battery fixing point 32.

[0024] like Figure 1 and Figure 2 As shown, among the various power batteries 2, the capacity and boundary dimensions of the standard power battery 2a are larger than those of each non-standard power battery 2b. The battery mounting points on the lower frame 1 correspond one-to-one with the battery mounting points on the standard power battery 2a. The number of types of non-standard power batteries 2b is adjusted according to the vehicle configuration requirements. Typically, there are one or two types of non-standard power batteries 2b. When there is only one type of non-standard power battery 2b, the lower body assembly is suitable for both long-range and short-range models. When there are two types of non-standard power batteries 2b, the lower body assembly is suitable for long-range, medium-range, and short-range models.

[0025] The universal lower body assembly provided in this application adds an adapter bracket 3 for the non-standard power battery 2b. The adapter bracket 3 compensates for the difference in boundary dimensions between the non-standard power battery 2b and the standard power battery 2a. As a result, after the power batteries 2 with different boundary dimensions are assembled on the same type of lower frame 1, the centers of gravity of the different types of power batteries 2 are close to coincide, thereby maintaining that the center of gravity of the whole vehicle will not have a large difference and reducing the impact of replacing different types of power batteries 2 on the chassis tuning components.

[0026] Reference Figure 6 In some embodiments, the standard power battery 2a includes a battery body 23a, and L-shaped connecting flanges 24a are respectively connected to both sides of the battery body 23a along the Y direction. The connecting flanges 24a are provided with first battery mounting points 21a.

[0027] Reference Figure 3In this embodiment, the battery body 23a is generally rectangular, with a connecting flange 24a connected to its left and right sides respectively. The connecting flange 24a is formed by an L-shaped connection of a long side and a short side. The long side of the connecting flange 24a is perpendicular to the Y-direction and connects to the left and right sides of the battery body 23a, with five first battery mounting points 21a sequentially arranged along the X-direction on this long side. The short side of the connecting flange 24a is parallel to the Y-direction and connects to the front side of the battery body 23a, with two first battery mounting points 21a sequentially arranged along the Y-direction on this short side. Corresponding to the above structure, each of the left and right sill assemblies 11 has seven first battery fixing points 12. In this structure, the long side of the connecting flange 24a strengthens the overall structural strength in the Y-direction, improving the battery power module's resistance to Y-direction impacts from pillar collisions; the short side of the connecting flange 24a strengthens the overall structural strength in the X-direction, improving the battery power module's resistance to X-direction impacts from frontal and offset collisions.

[0028] Reference Figure 3 and Figure 6 In some embodiments, the lower frame 1 further includes a front floor body 13 and a rear seat front crossbeam 14 disposed between the two sill assemblies 11. The front floor body 13 and the rear seat front crossbeam 14 are each provided with a plurality of third battery mounting points 15. The standard power battery 2a is provided with a third battery mounting point 22a corresponding to each of the third battery mounting points 15. In this embodiment, the front floor body 13 has two third battery mounting points 15 in the middle, and the rear seat front crossbeam 14 has one third battery mounting point 15 at each of its left and right ends. Correspondingly, the standard power battery 2a has two third battery mounting points 22a in the middle and two third battery mounting points 22a at its rear end.

[0029] Reference Figures 7 to 10 The adapter bracket 3 includes two first adapter components 33 spaced apart and symmetrically arranged along the Y direction, and a second adapter component 34 and a third adapter component 35 spaced apart along the X direction. The two first adapter components 33, the second adapter component 34 and the third adapter component 35 together form an installation space, and the non-standard power battery 2b is installed in the installation space.

[0030] In this embodiment, each first adapter component 33 is provided with 7 adapter mounting points 31 and 5 second battery fixing points 32. Correspondingly, the non-standard power battery 2b is provided with 5 second battery mounting points 21b on both sides along the Y direction.

[0031] In this embodiment, the various (specifically two) non-standard power batteries 2b have different boundary dimensions in the Y direction but the same boundary dimension in the X direction. Based on this, referring to... Figures 10 to 12Each first adapter component 33 includes a fixed plate 331, a sliding plate 332, and a locking structure. The sliding plate 332 is slidably disposed on the fixed plate 331 along the Y direction, and the locking structure is used to lock and release the relative positions of the fixed plate 331 and the sliding plate 332. Each adapter mounting point 31 is disposed on the fixed plate 331, and each second battery fixing point 32 is disposed on the sliding plate 332.

[0032] Based on the above structure, in order to limit the movement trajectory of the sliding plate 332 relative to the fixed plate 331, the fixed plate 331 is provided with a plurality of sliding grooves 333 arranged sequentially along the X direction, and each sliding groove 333 extends along the Y direction. Correspondingly, the sliding plate 332 is provided with a slider 334 corresponding to each sliding groove 333, and each slider 334 is slidably disposed in the corresponding sliding groove 333. Multiple threaded holes are arranged sequentially along the Y direction at the bottom of each sliding groove 333, and each slider 334 has two connecting elongated holes for the passing of a fixing bolt, which can communicate with two of the threaded holes respectively. The threaded holes, connecting elongated holes, and fixing bolts constitute a locking structure.

[0033] Through the above configuration, on the one hand, the same adapter bracket 3 can be adapted to various non-standard power batteries 2b of different sizes; on the other hand, by pushing the sliding plate 332 to slide relative to the fixed plate 331, the position of the second battery fixing point 32 on the lower frame 1 can be changed, so that the center of gravity of the non-standard power battery 2b after installation roughly coincides with the center of gravity reference point on the lower frame 1. The aforementioned center of gravity reference point is: the orthographic projection of the center of gravity of the standard power battery 2a on the lower frame 1 along the vertical direction after the standard power battery 2a is installed on the lower frame 1.

[0034] As mentioned above, the underframe 1 provided in this application is compatible with the assembly of various power batteries 2 with different capacity specifications, and can ensure that the centers of gravity of various power batteries 2 are roughly coincident after assembly.

[0035] For the assembly of various power batteries 2 with different capacity specifications, most components of the lower body assembly can be assembled in a compatible manner, while some components can only be used with one type of power battery 2.

[0036] The following describes the mounting structure of various components that can be compatible with the assembly of multiple power batteries 2.

[0037] Reference Figures 1 to 5 The universal lower body assembly also includes a front muffler assembly 41, and the lower frame 1 also includes two sill inner plates 16 spaced apart and symmetrically arranged along the Y direction. One of the sill inner plates 16 (specifically the left sill inner plate 16) is provided with a fixing hook 17 for fixing the front muffler assembly 41. The fixing hook 17 is used to fix the middle section of the front muffler assembly 41.

[0038] The universal lower body assembly also includes a fuel tank and fuel pump assembly 5, and the lower frame 1 also includes a rear seat front crossbeam 14 and a rear floor crossbeam 18 disposed between the two sill assemblies 11. The rear seat front crossbeam 14 and the rear floor crossbeam 18 are respectively provided with a number (specifically two) fuel tank fixing points 19 for fixing the fuel tank and fuel pump assembly 5.

[0039] The universal lower body assembly also includes a DC-DC transformer 6, and the lower frame 1 also includes two rear longitudinal beams 120 that are spaced apart and symmetrically arranged along the Y direction. Each rear longitudinal beam 120 is provided with a transformer fixing point 121 for fixing the DC-DC transformer 6. Specifically, each of the left and right rear longitudinal beams 120 is provided with two transformer fixing points 121.

[0040] The universal lower body assembly also includes a DC charging harness assembly 8, which has various specifications and is used in conjunction with various power batteries 2. The lower frame 1 also includes a rear floor assembly 124 located between the two sill assemblies 11, and the rear floor assembly 124 is provided with charging harness fixing points 125 for fixing various DC charging harness assemblies 8.

[0041] Reference Figure 5 The front floor body 13 and the rear floor assembly 124 of the lower frame 1 are respectively provided with a number of fuel pipe fixing points 126 for fixing the fuel pipe assembly.

[0042] The following describes the installation structure of the components that are only used with the standard power battery 2a.

[0043] Reference Figure 1 and Figure 3 The universal lower body assembly also includes a rear MCU power cable 7a used in conjunction with the standard power battery 2a; one of the rear longitudinal beams 120 of the lower frame 1 (specifically the right rear longitudinal beam 120) is provided with a rear power cable fixing point 122 for fixing the rear MCU power cable 7a.

[0044] The general-purpose lower body assembly also includes an electric air conditioning wiring harness 9a that is used in conjunction with the standard power battery 2a. On one of the door sill assemblies 11 and one of the rear longitudinal beams 120 on the same side (specifically the right side), there are air conditioning wiring harness fixing points 123 for fixing the electric air conditioning wiring harness 9a.

[0045] The following describes the installation structure of components that are only used with the non-standard power battery 2b.

[0046] Reference Figure 2 and Figure 3The universal lower body assembly also includes a power battery two-phase cable 7b used in conjunction with the non-standard power battery 2b; when the universal lower body assembly is equipped with the non-standard power battery 2b, the rear power cable fixing point 122 on the rear longitudinal beam 120 is used to fix the power battery two-phase cable 7b.

[0047] The various fixed points mentioned above are fixed holes, which can be threaded holes or through holes for bolts to pass through.

[0048] The following is a detailed description of each component of the general-purpose lower body assembly in this embodiment.

[0049] Reference Figure 13 The front end of the front muffler assembly 41 is connected to the pre-catalytic converter assembly, and its rear end is connected to the rear muffler assembly 42. A hook 411 is provided in the middle, and the hook 411 is connected to the fixed hook 17 on the lower frame 1 through a fixed lifting block.

[0050] Reference Figure 14 The rear muffler assembly 42 has an elliptical aluminum alloy flat barrel structure. A flat tube 421 is welded to its front end to connect and fix it to the front muffler assembly 41. A round tube 422 facing the ground is welded to its left end for engine gas exhaust. A hook is welded to each of its left and right end faces. The hooks on the rear muffler assembly 42 are connected to the hooks on the DCDC transformer 6 through fixed hanging blocks.

[0051] Reference Figure 15 In the fuel tank and fuel pump assembly 5, the fuel tank is an irregular rectangular body with a slanted groove 51 on the left side to avoid the front muffler assembly 41. The fuel tank and fuel pump assembly 5 is provided with 4 fuel tank mounting holes 52, which correspond one-to-one with the 4 fuel tank fixing points 19 on the lower frame 1 and are connected by bolts and other fasteners.

[0052] Reference Figure 16 and Figure 17The DC-DC transformer 6 is composed of an on-board charging CDU assembly 61, a CDU main frame bracket 62, and a DC-DC transformer heat insulation plate 63, all fixedly connected by bolts. The CDU main frame bracket 62 has two first transformer mounting holes 64 on each of its left and right sides, corresponding one-to-one with the transformer fixing points 121 on the lower frame 1 and connected by bolts or other fasteners. The front end of the CDU main frame bracket 62 has two second transformer mounting holes 65, corresponding one-to-one with the two fixing holes at the front end of the lower frame 1. The left and right sides of the CDU main frame bracket 62 each have two hooks for connecting one-to-one with the two hooks on the rear muffler assembly 42. The on-board charging CDU assembly 61 includes three transformer sockets 66 on its left and right sides, which are used to connect to various types of DC charging harness assemblies 8, rear MCU power cable 7a (suitable for long-range models), electric air conditioning harness 9a (suitable for long-range models), and power battery two-phase cable 7b (suitable for medium and short-range models).

[0053] Reference Figure 18 The rear MCU power cable 7a consists of two high-voltage wire harnesses, two high-voltage plugs, and seven wire harness clips 71a. Each wire harness clip 71a has a power cable mounting hole, which corresponds one-to-one with the seven rear power cable fixing points 122 on the lower frame 1 and is fixed with bolts. The two high-voltage plugs are respectively plugged into one of the transformer sockets 66 of the on-board charging CDU assembly 61 and the socket at the rear of the standard power battery 2a.

[0054] The two-phase power battery cable 7b has a similar structure to the rear MCU power cable 7a, so it will not be described in detail here.

[0055] Reference Figure 19 Different types of DC charging harness assemblies 8 have similar structures. Taking the DC charging harness assembly 8 adapted to the standard power battery 2a as an example, the DC charging harness assembly 8 consists of a charging port socket, a fast charging socket, a slow charging socket, 3 high-voltage harnesses, 2 high-voltage plugs, 5 harness clips, and a cable protection box. The 5 clips have 9 first charging harness mounting holes 81, which correspond one-to-one with the charging harness fixing points 125 on the lower frame 1 and are connected by bolts. The 2 second charging harness mounting holes 82 of the cable protection box are fixed to the fixing holes on the DC-DC transformer 6. The 2 high-voltage plugs are respectively plugged into the socket at the rear of the power battery 2 and one of the transformer sockets 66 of the on-board charging CDU assembly 61.

[0056] Reference Figure 20The electric air conditioning wiring harness 9a (suitable for long-range models) consists of two high-voltage wiring harnesses, three high-voltage plugs, several wiring harness ties, and wiring harness sheaths. It is fixed to the air conditioning wiring harness fixing points 123 on the lower frame 1 through multiple air conditioning wiring harness mounting holes 91a and multiple wiring harness ties 92a. The two high-voltage plugs at its front end are respectively plugged into the electric compressor assembly socket and the high-voltage electric heater assembly socket, and the one high-voltage plug at its rear end is plugged into one of the transformer sockets 66 of the on-board charging CDU assembly 61.

[0057] Continue to refer to Figure 1 and Figure 2 The lower body assembly also includes a front MCU power cable 10 mounted on the lower frame 1. The front MCU power cable 10 is also fixed on the lower frame 1 through matching mounting holes and fixing holes, and its structure is similar to the cable described above.

[0058] A second aspect of this application provides an automobile that includes the universal lower body assembly described in any of the foregoing embodiments. This automobile possesses at least all the technical effects of the aforementioned universal lower body assembly, which will not be elaborated upon here.

[0059] A third aspect of this application provides a method for assembling the lower body assembly of the above embodiments.

[0060] When the power battery 2 is the standard power battery 2a, the assembly method includes: matching the first battery mounting point 21a on the standard power battery 2a with the first battery fixing point 12 on the lower frame 1 and connecting them with fasteners.

[0061] When the power battery 2 is a non-standard power battery 2b, the assembly method includes: The adapter mounting point 31 on the adapter bracket 3 is matched one-to-one with the first battery fixing point 12 on the lower frame 1 and connected by bolts and other fasteners. Reference Figure 21 and Figure 22 Mark the center of gravity reference point O1 on the lower frame 1, and mark the center of gravity O2 on the non-standard power battery 2b; the center of gravity reference point O1 is: the orthographic projection of the center of gravity of the standard power battery 2a on the lower frame 1 in the vertical direction after the standard power battery 2a is installed on the lower frame 1; the power battery 2 is roughly rectangular in shape, and the center of gravity of the power battery 2 can be estimated based on its geometric dimensions, or the center of gravity of the power battery 2 can be calculated using multiple weighing sensors; Based on the dimensional relationship between the center of gravity O2 of the non-standard power battery 2b and the mounting point 21b of the second battery, the sliding plate 332 is pushed along the Y direction to move on the fixed plate 331 to adjust the relative position of the second battery fixing point 32 on the adapter bracket 3 and the center of gravity reference point O1; after the adjustment is completed, the sliding plate 332 is fixed on the fixed plate 331 by bolts. The second battery fixing point 32 on the adapter bracket 3 is matched one-to-one with the second battery mounting point 21b on the non-standard power battery 2b and connected by bolts or other fasteners.

[0062] Using the above assembly method, after power batteries 2 with different boundary dimensions are assembled on the same type of lower frame 1, the centers of gravity of different types of power batteries 2 are close to coincide, thus maintaining that the center of gravity of the whole vehicle will not have a large difference and reducing the impact of replacing different types of power batteries 2 on chassis tuning components.

[0063] In the specification of this application, directional terms such as X-direction, Y-direction, front end, and rear end are used. Specifically, X-direction and Y-direction represent the length and width directions of the vehicle in the O-XYZ coordinate system, respectively. The front end of each component refers to the end closest to the front of the vehicle, and the rear end refers to the end closest to the rear of the vehicle. It is understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A universal lower body assembly, characterized in that, The system includes a lower frame (1), a power battery (2), and an adapter bracket (3). The power battery (2) has various capacity specifications, including a standard power battery (2a) and at least one non-standard power battery (2b), wherein: The lower frame (1) includes two door sill assemblies (11) spaced apart and symmetrically arranged along the Y direction, and each door sill assembly (11) is provided with a plurality of first battery fixing points (12). The standard power battery (2a) is provided with a first battery mounting point (21a) corresponding to each first battery fixed point (12). The adapter bracket (3) is provided with an adapter mounting point (31) corresponding to each of the first battery fixing points (12). The adapter bracket (3) is provided with a number of second battery fixing points (32). The non-standard power battery (2b) is provided with a second battery mounting point (21b) corresponding to each of the second battery fixing points (32).

2. The universal lower body assembly according to claim 1, characterized in that, The adapter bracket (3) includes two first adapter components (33) spaced apart and symmetrically arranged along the Y direction, and a second adapter component (34) and a third adapter component (35) spaced apart along the X direction. The two first adapter components (33), the second adapter component (34) and the third adapter component (35) together form an installation space, and the non-standard power battery (2b) is installed in the installation space.

3. The universal lower body assembly according to claim 2, characterized in that, Each of the first adapter components (33) includes a fixed plate (331), a sliding plate (332), and a locking structure, wherein the sliding plate (332) is slidably disposed on the fixed plate (331) along the Y direction, and the locking structure is used to lock and release the relative positions of the fixed plate (331) and the sliding plate (332); each adapter mounting point (31) is disposed on the fixed plate (331), and each second battery fixing point (32) is disposed on the sliding plate (332).

4. The universal lower body assembly according to claim 1, characterized in that, The standard power battery (2a) includes a battery body (23a) and two connecting flanges (24a). The two connecting flanges (24a) are symmetrically connected to both sides of the battery body (23a) along the Y direction. Each connecting flange (24a) is provided with a plurality of first battery mounting points (21a).

5. The universal lower body assembly according to claim 1, characterized in that, It also includes a rear MCU power cable (7a) used in conjunction with the standard power battery (2a) and a power battery two-phase cable (7b) used in conjunction with the non-standard power battery (2b). The lower frame (1) also includes two rear longitudinal beams (120) spaced apart and symmetrically arranged along the Y direction, one of which has a rear power cable fixing point (122) for fixing the rear MCU power cable (7a) and the power battery two-phase cable (7b).

6. The universal lower body assembly according to claim 5, characterized in that, It also includes an electric air conditioning harness (9a) used in conjunction with the standard power battery (2a), and air conditioning harness fixing points (123) for fixing the electric air conditioning harness (9a) are respectively provided on one of the sill assemblies (11) and one of the rear longitudinal beams (120) on the same side.

7. The universal lower body assembly according to claim 1, characterized in that, It also includes a DC charging harness assembly (9), which has various specifications, and the various DC charging harness assemblies (9) correspond one-to-one with the various power batteries (2) and are used in conjunction with each other; The lower frame (1) also includes a rear floor assembly (124) disposed between the two sill assemblies (11), and the rear floor assembly (124) is provided with charging harness fixing points (125) for fixing various DC charging harness assemblies (9).

8. The universal lower body assembly according to any one of claims 1 to 7, characterized in that, The lower frame (1) includes a front muffler assembly (41) and two sill inner plates (16) spaced apart and symmetrically arranged along the Y direction, one of which is provided with a fixing hook (17) for fixing the front muffler assembly (41). And / or, also includes a fuel tank and fuel pump assembly (5), the lower frame (1) also includes a rear seat front crossbeam (14) and a rear floor crossbeam (18) disposed between the two sill assemblies (11), the rear seat front crossbeam (14) and the rear floor crossbeam (18) are respectively provided with a plurality of fuel tank fixing points (19) for fixing the fuel tank and fuel pump assembly (5). And / or, also includes a DC-DC transformer (6), the lower frame (1) also includes two rear longitudinal beams (120) spaced apart and symmetrically arranged along the Y direction, each of the rear longitudinal beams (120) is provided with a transformer fixing point (121) for fixing the DC-DC transformer (6).

9. A car, characterized in that, Includes the universal lower body assembly as described in any one of claims 1 to 8.

10. A method for assembling a lower body assembly, applied to the general-purpose lower body assembly according to any one of claims 1 to 8, characterized in that, When the power battery (2) is a standard power battery (2a), the assembly method includes: matching the first battery mounting point (21a) on the standard power battery (2a) with the first battery fixing point (12) on the lower frame (1) and connecting them with fasteners. When the power battery (2) is a non-standard power battery (2b), the assembly method includes: corresponding the adapter mounting point (31) on the adapter bracket (3) with the first battery fixing point (12) on the lower frame (1) and connecting them with fasteners; marking the center of gravity reference point on the lower frame (1) and marking the center of gravity of the non-standard power battery (2b); adjusting the relative position of the second battery fixing point (32) on the adapter bracket (3) and the center of gravity reference point according to the size relationship between the center of gravity of the non-standard power battery (2b) and the second battery mounting point (21b); corresponding the second battery fixing point (32) on the adapter bracket (3) with the second battery mounting point (21b) on the non-standard power battery (2b) and connecting them with fasteners.

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