WO2020143194A1

WO2020143194A1 - Battery pack bottom plate structure, battery pack, and electric vehicle

Info

Publication number: WO2020143194A1
Application number: PCT/CN2019/093470
Authority: WO
Inventors: 徐博豪; 汤超龙; 刘安龙
Original assignee: 广州小鹏汽车科技有限公司
Priority date: 2019-01-08
Filing date: 2019-06-28
Publication date: 2020-07-16
Also published as: CN209534724U

Abstract

A battery pack bottom plate structure, a battery pack, and an electric vehicle. The battery pack bottom plate structure comprises a top seal plate (1), a bottom seal plate (2), and a load-bearing frame (3); the top seal plate (1) and/or the bottom seal plate (2) are provided with welding grooves (4); the top seal plate (1) is welded to the bottom seal plate (2) at the welding grooves (4); the load-bearing frame (3) is welded to the top seal plate (1) and/or the bottom seal plate (2) at the welding grooves (4); several closed spaces (5) are formed between the top seal plate (1) and the bottom seal plate (2).

Description

Battery box floor structure, battery box and electric vehicle The

Technical field

The invention is used in the field of electric vehicles, in particular to a battery box bottom plate structure, a battery box and an electric vehicle.

Background technique

At present, the weight of the battery box is the development trend of the entire electric vehicle battery. However, as the weight of the battery continues to increase, the load-bearing requirements of the battery box are also increasing. At the same time, the battery box also needs to meet the bottom stone strike, bottom scraping, etc. Basic safety performance, which poses a major challenge to the battery box and the bottom plate of the battery box. At the same time, as the battery box becomes larger and larger, the welding deformation caused by the common extruded profile structure becomes more and more serious.

Summary of the invention

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a battery box bottom plate structure, a battery box and an electric vehicle, which can simultaneously achieve the simultaneous improvement of the strength of the box body and the performance of the battery box. Further improve the safety and volume energy density of the entire battery system.

The technical solution adopted by the present invention to solve its technical problems is: a battery box bottom plate structure, including a top seal plate, a bottom seal plate and a load-bearing frame, the top seal plate and/or the bottom seal plate is provided with a welding groove Position, the top seal plate and the bottom seal plate are welded at the welding slot, the load-bearing frame is welded to the top seal plate and/or the bottom seal plate at the welding slot, so Several closed spaces are formed between the top-layer sealing plate and the bottom-layer sealing plate.

Preferably, the bottom sealing plate is flat, the top sealing plate is provided with a welding slot, and the top sealing plate and the bottom sealing plate are connected by friction stir welding at the welding slot.

Preferably, the supporting frame is provided with a supporting edge, and the supporting edge is connected with the top sealing plate and/or the bottom sealing plate by friction stir welding.

Preferably, the plurality of enclosed spaces are arranged in a number of horizontal or vertical rows along a straight line or a curve.

Preferably, the bottom sealing plate is provided with a number of reinforcing rib structures on the inner side of the enclosed space.

Preferably, a filler is provided in all or part of the enclosed space.

Preferably, all or part of the top space of the enclosed space is provided with through holes.

Preferably, the filler includes one or more of polyurethane material, silica gel, and butane rubber.

A battery box includes the battery box bottom plate structure described in any of the above technical solutions.

An electric vehicle includes the battery box described in any one of the above technical solutions.

One of the above technical solutions has at least one of the following advantages or beneficial effects: through the innovation of this technical solution, the performance of both the strength of the cabinet and the capacity of the battery box can be simultaneously improved to further improve the safety of the entire battery system Sex and volumetric energy density. At the same time, the unique layered structure design solves the problems of severe welding deformation and relatively fixed cavity distance caused by common extruded profile structures. Through actively reserved welding slots and flexible top and bottom sealing plates The distance adjustment provides the possibility to actively control the amount of deformation and the thickness distance of the bottom plate of the box.

BRIEF DESCRIPTION

The present invention will be further described below with reference to the drawings:

FIG. 1 is a schematic structural view of an embodiment of the present invention;

2 is a partial cross-sectional view of an embodiment shown in FIG. 1;

FIG. 3 is a partially enlarged view at A in FIG. 2;

4 is a partial cross-sectional view of another embodiment of the present invention;

FIG. 5 is a partially enlarged view of B in FIG. 4;

6 is a schematic structural view of another embodiment of the present invention;

7 is a partial cross-sectional view of an embodiment shown in FIG. 6;

FIG. 8 is a partially enlarged view at C in FIG. 7.

detailed description

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the description with graphics, so that people can intuitively and visually understand this. Each technical feature and overall technical solution of the invention, but it cannot be understood as a limitation to the protection scope of the present invention.

In the present invention, if there is a description to the direction (up, down, left, right, front and back) At this time, it is only for the convenience of describing the technical solutions of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention.

In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, "greater than", "less than", "exceeded", etc. are understood as not including this number; "above", "below" ", "within" Etc. are understood to include this number. In the description of the present invention, if it is described that "first" and "second" are only used to distinguish technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features Or implicitly indicate the sequence of the indicated technical features.

In the present invention, unless otherwise clearly defined, the words "setup", "installation", "connection" and other terms should be understood in a broad sense. For example, they may be directly connected or indirectly connected through an intermediate medium; they may be fixedly connected, or It can be a detachable connection, or it can be integrally formed; it can be a mechanical connection, it can be an electrical connection or can communicate with each other; it can be a connection between two components or an interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in conjunction with the specific content of the technical solution.

Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8, an embodiment of the present invention provides a battery box bottom plate structure, including a top sealing plate 1, a bottom sealing plate 2 and The load-bearing frame 3 includes a peripheral frame and/or a middle frame. The top-layer sealing plate 1 and/or the bottom-layer sealing plate 2 are provided with welding slots 4. The top-layer sealing plate 1 and the bottom layer sealing The plate 2 is welded at the welding slot 4, the load-bearing frame 3 and the top sealing plate 1 and/or the bottom sealing plate 2 are welded at the welding slot 4, the top sealing plate 1 is Several closed spaces 5 are formed between the bottom sealing plates 2. The welding slot 4 is used to align the top sealing plate 1 and the bottom sealing plate 2 and the load-bearing frame 3 to the top sealing plate 1 and/or the bottom sealing plate 2 on the one hand, and can also pass through Adjust the parameters such as the position of the welding seam and the welding width to improve the deformation problem during the welding of the box. The volume of the enclosed space 5 can be adjusted according to the welding slot 4 of the bottom sealing plate 2 and/or the top sealing plate 1, the plate thickness and the size of the plate.

Through the innovation of this technical solution, the performance of both the strength of the cabinet and the capacity of the battery box can be simultaneously improved, and the safety and volume energy density of the entire battery system can be further improved. At the same time, the unique layered structure design solves the problems of severe welding deformation and relatively fixed cavity distance caused by common extruded profile structures. Through actively reserved welding slots 4 and flexible top and bottom sealing plates 1, the bottom layer The distance adjustment between the sealing plates 2 provides the possibility to actively control the amount of deformation and the thickness distance of the bottom plate of the box.

In some embodiments, referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, the top seal plate 1 and/or the bottom seal plate 2 are provided with Welding slot 4, top sealing plate 1, bottom sealing plate 2 and load-bearing frame 3 can be welded by resistance welding, friction stir welding, etc. Preferably, the bottom sealing plate 2 is flat and the top sealing plate 1 is provided There is a welding slot 4, and the top sealing plate 1 and the bottom sealing plate 2 are connected by friction stir welding at the welding slot 4. Welding characteristics of the heat-affected zone of the friction stir welding joint are small, and the residual stress is relatively low. By replacing the conventional welding form with the above structure, the deformation problem during the box welding process can be improved.

In some embodiments, referring to FIG. 2, FIG. 3, FIG. 4, and FIG. 5, in order to facilitate the welding of the load-bearing frame 3 and the top-layer sealing plate 1 and/or the bottom-layer sealing plate 2, the load-bearing frame 3 is provided with There is a supporting edge 6 which is connected to the top sealing plate 1 and/or the bottom sealing plate 2 by friction stir welding. That is, the supporting edge 6 is used for positioning with the bottom sealing plate 2 and the top sealing plate 1 when welding and to provide a molten base material during welding, which is convenient for improving the overall welding strength and controlling welding deformation.

Wherein, the arrangement of the enclosed space 5 is correspondingly set according to the battery modules, high-voltage distribution boxes and other components contained in the battery box, such as but not limited to the following forms, the plurality of enclosed spaces 5 are arranged along a straight line or a curve in a number of horizontal For rows or longitudinal rows, refer to FIG. 1, the plurality of enclosed spaces 5 are arranged in two horizontal rows along a straight line, and referring to FIG. 6, the plurality of enclosed spaces 5 are arranged in four horizontal rows along a straight line.

In some embodiments, referring to FIG. 5, a plurality of reinforcing rib structures 7 are provided on the inner side of the enclosed space 5 on the bottom sealing plate 2 to improve the strength of the bottom sealing plate 2.

In some embodiments, the rib structure 7 can be combined with the top sealing plate 1 by changing the depth and shape to isolate a plurality of enclosed spaces 5, so as to selectively enhance the bottom load bearing according to the load bearing situation of the entire box The role.

In some embodiments, the enclosed space 5 is hollow.

In some embodiments, all or part of the enclosed space 5 is provided with a filler.

In some embodiments, referring to FIG. 5, the filler is made of polyurethane material, which can be filled into the enclosed space 5 during the welding process, and used to strengthen the strength of the entire bottom plate under harsh working conditions such as bottom scraping and rock strikes.

In some embodiments, referring to FIG. 1, FIG. 2, FIG. 3, FIG. 6, FIG. 7, and FIG. 8, all or part of the top space sealing plate 1 of the enclosed space 5 is provided with a through hole 8. The filler is selected from one or more of polyurethane material, silica gel, butane rubber, and can be filled into the enclosed space 5 through a plurality of through holes 8, compared with other embodiments, this embodiment is more convenient to control the filling of the filler Location, distribution and filling volume.

Of course, the above embodiments can be used together, and can be adjusted according to different load-bearing, wheelbase, and structure of different boxes, to improve the versatility of the structure, flexibility and convenience of process operation.

An embodiment of the present invention further provides a battery box, including the battery box bottom structure described in any of the above embodiments.

An embodiment of the present invention also provides an electric vehicle, including the battery box described in any of the above embodiments.

Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without violating the spirit of the invention. These equivalent modifications or replacements are included in the claims of this application. Within the limits.

Claims

A battery box bottom plate structure is characterized by comprising a top seal plate, a bottom seal plate and a load-bearing frame, the top seal plate and/or the bottom seal plate are provided with welding slots, the top seal plate and the bottom The bottom sealing plate is welded at the welding slot, the load-bearing frame is welded to the top sealing plate and/or the bottom sealing plate is welded at the welding slot, the top sealing plate and the bottom sealing Several closed spaces are formed between the plates.
The bottom plate structure of the battery box according to claim 1, wherein the bottom sealing plate is flat, the top sealing plate is provided with a welding slot, and the top sealing plate and the bottom sealing plate are welded The slots are connected by friction stir welding. The
The bottom plate structure of the battery box according to claim 2, wherein the supporting frame is provided with a supporting edge, and the supporting edge is connected to the top sealing plate and/or the bottom sealing plate by friction stir welding. The
The bottom plate structure of a battery box according to claim 3, wherein a plurality of the enclosed spaces are arranged in a number of horizontal or vertical rows along a straight line or a curve. The
The bottom plate structure of the battery box according to claim 2, wherein the bottom sealing plate is provided with a plurality of rib structures on the inner side of the enclosed space. The
The battery box bottom plate structure according to any one of claims 1 to 5, wherein a filler is provided in all or part of the enclosed space. The
The bottom plate structure of the battery box according to claim 6, wherein all or a part of the top sealing plate of the enclosed space is provided with a through hole.
The bottom plate structure of the battery box according to claim 7, wherein the filler includes one or more of polyurethane material, silica gel, and butane rubber. The
A battery box, characterized by comprising the battery box bottom plate structure according to any one of claims 1 to 8.
An electric vehicle, characterized by comprising the battery box according to claim 9.