An electric vehicle battery pack mounting assembly and a battery pack middle mounting point structure

Abstract

The present application relates to an electric vehicle battery pack installation component and a battery pack middle installation point structure, wherein the battery pack installation component comprises: a battery pack installation reinforcement member, which is used to be fixed on the side of the front floor away from the seat cross beam; a battery pack installation fixing component, which comprises a mounting nut box and a movable nut, wherein the movable nut is movably installed in the mounting nut box, and the mounting nut box is used to be fixed on the side of the front floor close to the seat cross beam. The present application has the effect of reducing the cost of a single vehicle, reducing the man-hours of manual operation, and reducing the difficulty of installing the battery pack by setting the battery pack installation reinforcement member on the side of the front floor away from the seat cross beam, and setting the movable nut and the mounting nut box on the other side of the front floor for fixing the battery pack shell during installation.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle battery pack installation, and in particular to an electric vehicle battery pack installation assembly and a battery pack middle installation point structure. Background Art

[0002] At present, the battery of electric vehicles tends to be a flat large battery pack structure, the main purpose of which is to meet the layout requirements of the whole vehicle, improve the cruising range of the whole vehicle, and realize the modularization and platform application of the battery box. For the large battery pack structure, in addition to evenly arranging the installation points around the outside of the battery pack box, the installation points also need to be arranged in the middle area of ​​the entire battery pack box. The selection of the location of the middle installation point of the battery is limited by the battery box structure, the layout of the module, the position of the seat crossbeam, etc. In the early stage of vehicle design, it is necessary to comprehensively consider the batteries planned on the entire architecture platform, and then determine the location of the middle installation point of the battery. Therefore, the location of the middle installation point of the battery has a great impact on the early architecture layout. However, it is difficult to meet the optimal requirements of the above factors at the same time. The usual practice is to develop the body based on the battery layout adaptation. As a result, on the same architecture platform, the body usually needs to develop different front floor structures to meet the installation requirements of batteries with different power and different configurations. This leads to a complicated body structure, and the development cost and vehicle cost increase.

[0003] In the related technology, the invention patent with publication number CN112757885A provides a method for improving the universality of the middle mounting point of the battery pack and the vehicle body connection structure. When designing the front floor assembly of the vehicle body, the mounting holes of the middle mounting points involved in all battery pack configurations are reserved, so that the front floor assembly has a flexible installation function, improves compatibility with different battery packs, and thus improves the universality of the middle mounting point of the battery pack and the vehicle body connection structure.

[0004] However, in order to achieve universality, the battery pack mounting point structure in the above-mentioned related technology needs to reserve the required battery pack mounting reinforcement plates and mounting vias for all battery pack configurations. This is because without the battery pack mounting assembly, there will be a gap between the seat crossbeam and the front floor, which does not meet the welding requirements. When installing one of the battery pack configurations, this structure will make the battery pack mounting reinforcement plates, welding points and mounting vias reserved for other battery pack configurations redundant. The extra battery pack mounting reinforcement plates reserved need to be welded, and the extra holes need to be covered with hot melt adhesive for sealing reasons, which will invisibly increase the cost of each vehicle and manual operation hours. Summary of the invention

[0005] The embodiments of the present application provide an electric vehicle battery pack mounting assembly and a battery pack middle mounting point structure to solve the problem in the related art that the battery pack mounting point structure will cause an increase in the cost of a single vehicle and the man-hours for manual operation.

[0006] On the one hand, the present application provides an electric vehicle battery pack mounting assembly, which adopts the following technical solution:

[0007] An electric vehicle battery pack mounting assembly, comprising:

[0008] A battery pack mounting reinforcement member, which is used to be fixed on a side of the front floor away from the seat crossbeam;

[0009] A battery pack installation and fixing assembly comprises a mounting nut box and a movable nut, wherein the movable nut is movably mounted in the mounting nut box, and the mounting nut box is used to be fixed on a surface of the front floor close to the seat crossbeam.

[0010] In some embodiments, the battery pack installation reinforcement is a battery pack installation reinforcement plate or a battery pack installation reinforcement strip.

[0011] In some embodiments, the battery pack installation reinforcement is a battery pack installation reinforcement plate, which is used to fit and fix with the front floor.

[0012] In some embodiments, the battery pack mounting assembly further includes a fixing bolt, which is used to pass through the battery pack housing, the battery pack mounting reinforcement plate and the front floor and to be connected to the movable nut.

[0013] In some embodiments, at least two positioning bosses are provided on one side surface of the battery pack mounting reinforcement plate, and positioning holes are formed on the positioning bosses.

[0014] On the other hand, the present application also provides a central mounting point structure of an electric vehicle battery pack, comprising:

[0015] The seat crossbeam, the front floor and the battery pack housing, the front floor is located between the seat crossbeam and the battery pack housing, and the seat crossbeam is fitted and fixed to the front floor;

[0016] A battery pack mounting reinforcement, which is fixed to a side of the front floor away from the seat cross member;

[0017] A battery pack installation and fixing assembly includes a mounting nut box, a movable nut and a fixing bolt. The movable nut is movably installed in the mounting nut box. The mounting nut box is fixed to a surface of the front floor close to the seat cross beam. The fixing bolt passes through the battery pack housing, the battery pack installation reinforcement and the front floor and is connected to the movable nut.

[0018] In some embodiments, the battery pack installation reinforcement is a battery pack installation reinforcement plate or a battery pack installation reinforcement strip.

[0019] In some embodiments, the front floor is recessed at the battery pack mounting reinforcement in a direction away from the battery pack housing to form a mounting groove, and the battery pack mounting reinforcement is disposed in the mounting groove.

[0020] In some embodiments, a mounting hole for the fixing bolt to pass through is opened on the front floor, and the movable radius of the movable nut in the mounting nut box along the direction parallel to the front floor with the mounting hole as the center is 3 mm.

[0021] In some embodiments, a mounting hole for the fixing bolt to pass through is opened on the front floor, and the front floor and the battery pack mounting reinforcement plate are sealed around the mounting hole by a sealant.

[0022] The beneficial effects of the technical solution provided by this application include:

[0023] 1. The present application arranges a battery pack installation reinforcement on a side of the front floor away from the seat crossbeam, and arranges a movable nut and a mounting nut box on the other side of the front floor for fixing the battery pack shell during installation. That is, the battery pack installation components only come into contact with the front floor but not directly with the seat crossbeam. Therefore, the seat crossbeam can be directly welded to the front floor without reserving a gap to assemble the battery pack components. It can also ensure the universality of the installation of battery packs with different configurations. That is, when a battery pack of a certain configuration requires a middle installation point, the installation requirement can be met by adding a battery pack installation component. When a battery pack of a certain configuration does not require a middle installation point, the battery pack installation component can be directly cancelled, thereby reducing the cost of a single vehicle and reducing manual operation hours.

[0024] 2. The present application adopts the arrangement of the installation nut box and the movable nut. On the one hand, the movable nut box can limit and position the movable nut, so that the battery pack shell can be connected with the movable nut through bolts to fix the battery pack shell; on the other hand, the movable nut has a certain amount of mobility in the installation nut box, which can offset the misalignment caused by the manufacturing error of the vehicle body welding, thereby reducing the difficulty of installing the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic top view of the electric vehicle battery pack mounting assembly and the front floor assembly provided in an embodiment of the present application;

[0027] Figure 2 A bottom view schematic diagram of the electric vehicle battery pack mounting assembly and the front floor assembly provided in an embodiment of the present application;

[0028] Figure 3A schematic diagram of the structure of a battery pack mounting reinforcement plate in an electric vehicle battery pack mounting assembly provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of the structure of installing a nut box and a movable nut in an electric vehicle battery pack installation assembly provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the middle installation point structure of an electric vehicle battery pack provided in an embodiment of the present application.

[0031] In the figure: 1. Battery pack installation reinforcement plate; 101. Positioning boss; 102. Positioning hole; 2. Installation nut box; 201. Box bottom plate; 202. Box wall; 203. Box cover; 204. Limit plate; 205. Connecting plate; 206. Baffle; 3. Movable nut; 4. Fixing bolt; 5. Seat cross beam; 6. Front floor; 601. Installation slot; 7. Battery pack shell. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] Reference Figure 1-5 As shown, the present application provides an electric vehicle battery pack mounting assembly, which includes a battery pack mounting reinforcement and a battery pack mounting fixing assembly, wherein the battery pack mounting reinforcement is used to be fixed on the side of the front floor 6 away from the seat cross beam 5, and the battery pack mounting fixing assembly includes a mounting nut box 2 and a movable nut 3, wherein the movable nut 3 is movably mounted in the mounting nut box 2, and the mounting nut box 2 is used to be fixed on the side of the front floor 6 close to the seat cross beam 5. The battery pack mounting reinforcement plays a role in strengthening the structural strength of the battery pack mounting point, and the mounting nut box 2 and the movable nut 3 are used to fix the battery pack housing 7 when it is installed.

[0034] The battery pack installation reinforcement can be a battery pack installation reinforcement plate 1 or a battery pack installation reinforcement strip, and the design criterion is to be able to strengthen the structural strength at the battery pack installation point. In the present embodiment, it is the battery pack installation reinforcement plate 1, and in other embodiments, reinforcements of other shapes can also be selected. The battery pack installation reinforcement plate 1 is attached to the front floor 6 and welded to the front floor 6; the battery pack installation reinforcement plate 1 is a metal stamping part, which has the advantages of simple structure, fewer stamping processing steps, light weight, and low unit cost.

[0035] To facilitate the installation and fixation of the battery pack shell 7 on the front floor 6, the battery pack installation assembly also includes a fixing bolt 4. During installation, the fixing bolt 4 passes through the battery pack shell 7, the battery pack installation reinforcement plate 1 and the front floor 6 and is connected to the movable nut 3. Accordingly, the battery pack installation reinforcement plate 1 and the front floor 6 are provided with installation holes for the fixing bolt 4 to pass through.

[0036] At least two positioning bosses 101 are provided on one side of the battery pack installation reinforcement plate 1, and positioning holes 102 are opened on the positioning bosses 101; specifically, the positioning bosses 101 are provided on the side of the battery pack installation reinforcement plate 1 away from the front floor 6. By providing the bosses and providing the positioning holes 102 on the bosses, a certain distance is maintained between the positioning surface of the positioning holes 102 and the front floor 6, so that when the battery pack installation reinforcement plate 1 is welded on the front floor 6, the battery pack installation reinforcement plate 1 can be positioned without opening positioning holes on the front floor 6.

[0037] In this embodiment, the mounting nut box 2 is a metal stamping part, which includes a box bottom plate 201, and the opposite sides of the box bottom plate 201 are bent toward a side direction of the box bottom plate 201 to form two side box walls 202, and the two side box walls 202 are bent in a direction close to each other to form a box cover 203 parallel to the box bottom plate 201; in order to achieve the limiting effect of the movable nut 3, arc-shaped notches are opened on the two side box covers 203, and the two notches are spliced ​​to form a through hole for the movable nut 3 to pass through, and the distance between the two side box covers 203 is smaller than the diameter of the movable nut 3, the movable nut 3 passes through the through hole and is connected to a limiting plate 204 arranged in the box, and the central axis of the movable nut 3 is perpendicular to the plane of the limiting plate 204.

[0038] When installing the nut box 2, the box bottom plate 201 is fitted to the front floor 6 and welded to fix. Correspondingly, mounting holes connected to the screw holes of the movable nut 3 are provided on the box bottom plate 201 and the limiting plate 204. When welding the nut box 2, the mounting holes on the box bottom plate 201 are welded to the mounting holes on the front floor 6 corresponding to each other.

[0039] During the design, the movable radius of the movable nut 3 in the mounting nut box 2 along the direction parallel to the box bottom plate 201 is 3 mm with the mounting hole on the box bottom plate 201 as the center, which can meet the 3mm manufacturing allowable error requirement of the battery pack mounting assembly in the structural design.

[0040] Connecting plates 205 are provided on both sides of the box bottom 201 where the box wall 202 is not formed. The two connecting plates 205 are both in the same plane as the box bottom 201 and are integrally formed with the box bottom 201. One side of the connecting plate 205 is bent toward the box cover 203 to form a baffle 206 perpendicular to the box bottom 201.

[0041] The present embodiment also provides a middle installation point structure of an electric vehicle battery pack, which is installed using the above-mentioned electric vehicle battery pack installation assembly, including a seat beam 5, a front floor 6, a battery pack shell 7, a battery pack installation reinforcement and a battery pack installation fixing assembly, the front floor 6 is located between the seat beam 5 and the battery pack shell 7, the seat beam 5 and the front floor 6 are bonded and welded and fixed, the battery pack installation reinforcement is fixed to the side of the front floor 6 away from the seat beam 5, which is a battery pack installation reinforcement plate 1 in this embodiment; the battery pack installation fixing assembly includes a mounting nut box 2, a movable nut 3 and a fixing bolt 4, the movable nut 3 is movably installed in the mounting nut box 2, the mounting nut box 2 is fixed to the side of the front floor 6 close to the seat beam 5, and the fixing bolt 4 passes through the battery pack shell 7, the battery pack installation reinforcement and the front floor 6 and is connected to the movable nut 3.

[0042] The battery pack installation reinforcement plate 1 is adhered and welded to the side of the front floor 6 away from the seat cross beam 5, and the front floor 6 is recessed at the battery pack installation reinforcement plate 1 away from the battery pack shell 7 to form an installation groove 601, and the battery pack installation reinforcement plate 1 is arranged in the installation groove 601; thereby, the battery pack installation reinforcement plate 1 can still be arranged between the front floor 6 and the battery pack shell 7 without reducing the minimum gap between the upper cover of the battery pack shell 7 and the front floor 6.

[0043] When the battery pack mounting nut box 2 is installed, the movable radius of the movable nut 3 in the mounting nut box 2 along the direction parallel to the box bottom plate 201 with the mounting hole on the box bottom plate 201 as the center is 3mm, that is, the movable radius of the movable nut 3 in the mounting nut box 2 along the direction parallel to the front floor 6 with the mounting hole on the front floor 6 as the center is 3mm; this can meet the manufacturing allowable error of 3mm to ensure that the fixing bolt 4 can be connected to the movable nut 3.

[0044] In order to prevent water from penetrating into the vehicle cabin through the battery pack mounting hole on the front floor 6 , a sealant is used around the mounting hole between the front floor 6 and the battery pack mounting reinforcement plate 1 .

[0045] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0046] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0047] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An electric vehicle battery pack mounting assembly, characterized in that: include: A battery pack mounting reinforcement member, which is used to be fixed on a side of the front floor (6) away from the seat crossbeam (5); A battery pack installation and fixing assembly, comprising a mounting nut box (2) and a movable nut (3), wherein the movable nut (3) is movably mounted in the mounting nut box (2), and the mounting nut box (2) is used to be fixed on a surface of a front floor (6) close to a seat crossbeam (5); The battery pack installation reinforcement member is a battery pack installation reinforcement plate (1), which is used to fit and fix with the front floor (6); The battery pack installation assembly further comprises a fixing bolt (4), wherein the fixing bolt (4) is used to pass through the battery pack housing (7), the battery pack installation reinforcement plate (1) and the front floor (6) and to be connected to the movable nut (3); At least two positioning bosses (101) are provided on one side surface of the battery pack installation reinforcement plate (1), and positioning holes (102) are provided on the positioning bosses (101); The front floor (6) is recessed at the battery pack installation reinforcement plate (1) in a direction away from the battery pack housing (7) to form an installation groove (601), and the battery pack installation reinforcement plate (1) is arranged in the installation groove (601).

2. A mid-mounting point structure of an electric vehicle battery pack, which is installed using the electric vehicle battery pack mounting assembly as claimed in claim 1, characterized in that: include: A seat crossbeam (5), a front floor (6) and a battery pack housing (7), wherein the front floor (6) is located between the seat crossbeam (5) and the battery pack housing (7), and the seat crossbeam (5) and the front floor (6) are fitted and fixed; A battery pack mounting reinforcement member fixed to a side of the front floor (6) away from the seat crossbeam (5); A battery pack installation and fixing assembly comprises a mounting nut box (2), a movable nut (3) and a fixing bolt (4); the movable nut (3) is movably mounted in the mounting nut box (2); the mounting nut box (2) is fixed on a surface of a front floor (6) close to a seat crossbeam (5); and the fixing bolt (4) passes through a battery pack housing (7), a battery pack installation reinforcement and the front floor (6) and is connected to the movable nut (3).

3. The electric vehicle battery pack middle mounting point structure according to claim 2, characterized in that: The front floor (6) is provided with a mounting hole for the fixing bolt (4) to pass through, and the movable nut (3) has a movable radius of 3 mm in the mounting nut box (2) along a direction parallel to the front floor (6) with the mounting hole as the center.

4. The electric vehicle battery pack middle mounting point structure according to claim 3, characterized in that: The front floor (6) and the battery pack mounting reinforcement plate (1) are sealed around the mounting hole by means of a sealant.

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