WO2025051132A1 - Battery pack housing and vehicle - Google Patents

Abstract

A battery pack housing and a vehicle. The battery pack housing comprises: first beam bodies (10), wherein there are a plurality of first beam bodies (10), and the plurality of first beam bodies (10) define a battery pack housing frame; and second beam bodies (20), wherein there are a plurality of second beam bodies (10), the plurality of second beam bodies (20) are arranged in parallel in the battery pack housing frame, and spaces between adjacent second beam bodies (20) and between the second beam bodies (20) and the first beam bodies (10) are used for accommodating battery cells or module units. The first beam bodies (10) are used for forming the battery pack housing frame, the plurality of second beam bodies (20) are arranged in the battery pack housing frame, thereby forming the spaces for accommodating battery cells or module units, so that batteries are completely covered by the housing, the safety of a battery pack can be improved while the lightweight requirement of a new energy vehicle on a power battery pack is met, and the technical problems of low rigidity and strength, poor modal, and heavy weight of the battery pack are solved.

Description

Battery pack housing and vehicle Technical Field

The present invention relates to the technical field of manufacturing battery pack shells for electric vehicles, in particular to a battery pack shell and a vehicle.

Background Art

Under the strategic background of my country's energy transformation, the market share of new energy electric vehicles is increasing year by year, and the safety of power battery packs is increasingly concerned by consumers. There are currently two main solutions for traditional battery pack shells:

The first method: using cold stamped steel plates. The thickness of the steel plates is usually greater than 1.0mm. Stamping has size limitations. For larger sizes, the stamping process requires a draft angle, and space must be reserved in the edge area for shell forming. In terms of space utilization, stamped shells usually have disadvantages. In addition, stamped sheet metal is a single-layer structure, and its stiffness, strength and whole package mode need to be improved through additional welding reinforcement beams. This makes the sheet metal shell usually heavier, and the applicable power range and size space are limited. Another steel shell process derived from sheet metal stamping shells is bending and welding shells, which solves the problem that large-size shells cannot be stamped, but the shell uses welding to achieve sealing. The disadvantage is that the welding process requirements are high. Once the welding fails, it will cause battery pack safety problems.

The second method is to use aluminum profiles to weld the shell. The welded shell components are usually formed by extrusion and die casting, and then welded into the shell by stir friction welding, arc welding and other welding methods. Profile extrusion can form complex cross-sections, so its strength and mode are better than sheet metal shells. Its dimensional adaptability is high and can meet the requirements of different ranges of shell sizes. The raw material source of aluminum has the disadvantage of high energy consumption, resulting in high cost.

Application Contents

The purpose of the present invention is to provide a battery pack shell and a vehicle to solve the problems of heavy shell, high raw material cost and high welding process requirements in the current manufacturing process of electric vehicle battery pack shells, so that the battery pack shell can ensure light weight while having good rigidity and strength.

In a first aspect, the present invention provides a battery pack housing, comprising:

A first beam body, wherein the first beam body comprises a plurality of first beam bodies, and the plurality of first beam bodies enclose a battery pack housing frame;

The second beam body includes a plurality of second beam bodies, and the plurality of second beam bodies are arranged in parallel in the frame of the battery pack shell, and the space between adjacent second beam bodies and between the second beam body and the first beam body is used to accommodate the battery cell or module unit.

In the battery pack shell as described above, preferably, the first beam body includes a frame body and a dividing surface, and the dividing surface divides the frame body into a first cavity and a second cavity.

A battery pack shell as described above, wherein preferably, the frame includes a first wall and a second wall arranged in parallel, and a third wall and a fourth wall arranged in parallel, and the first wall, the third wall, the second wall and the fourth wall are sequentially connected to form the frame, wherein:

The first wall surface is a straight wall surface, the second wall surface includes a first side surface and a second side surface, the first end of the first side surface is connected to one end of the third wall surface, the second end of the first side surface is integrally formed with the first end of the dividing surface, the second end of the dividing surface is fixedly connected to the first wall surface after being bent, the first end of the second side surface is connected to one end of the fourth wall surface, and the second end of the second side surface is fixedly connected to the dividing surface after being bent.

In the battery pack shell as described above, preferably, the dividing surface is an inclined surface.

A battery pack shell as described above, wherein preferably, the second beam body includes two symmetrically arranged connecting bodies, the connecting body includes an opening section, a first stage and a second stage connected in sequence, and after the two connecting bodies are fixedly connected, a third cavity is formed between the two opening sections.

In the battery pack shell as described above, preferably, the battery pack shell further includes a bottom plate, and the first beam body and the second beam body are both fixed on the bottom plate.

In the battery pack shell as described above, preferably, at least one third beam is provided on the frame of the battery pack shell, and the third beam is used to install the battery pack shell on the vehicle body.

In the battery pack shell as described above, preferably, both the first beam body and the second beam body are made of roll-formed steel.

A battery pack shell as described above, wherein preferably, the roll-formed steel has a thickness of 1.0-2.0 mm.

In a second aspect, the present invention provides a vehicle comprising the aforementioned battery pack housing.

Compared with the prior art, the present invention utilizes a first beam body to form the frame of the battery pack shell, and arranges multiple second beam bodies in the battery pack shell frame to form a space that can accommodate battery cells or module units, so that the battery is completely wrapped and covered by the shell, which can improve the safety of the battery pack while meeting the lightweight requirements of new energy vehicles for power battery packs. Compared with traditional stamped steel battery shells, it solves the shortcomings of weak stiffness and strength, poor modality, and heavy weight.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of a battery pack housing of the present invention;

FIG2 is a schematic structural diagram of a first beam body of the present invention;

FIG. 3 is a schematic structural diagram of a second beam body of the present invention.

Description of reference numerals:
10-first beam body, 11-frame body, 111-first wall surface, 112-second wall surface, 1121-first side surface, 1122-second side surface, 113-third wall surface, 114-fourth wall surface, 12-dividing surface, 13-first cavity, 14-second cavity;
20-second beam, 21-connector, 211-opening section, 212-first stage, 213-second stage, 22-
The third cavity;
30- bottom plate;
40-The third beam.

Embodiments of the present invention

The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

1, the present invention provides a battery pack housing, including a first beam body 10 and a second beam body 20, wherein:

The first beam body 10 includes a plurality of first beam bodies 10 , which enclose a battery pack shell frame. In the embodiment provided in the present application, the first beam body 10 includes four first beam bodies 10 , which are sequentially connected at the ends to form a rectangular frame.

The second beam body 20 includes multiple second beam bodies 20, which are arranged in parallel in the frame of the battery pack shell. The space between adjacent second beam bodies 20 and between the second beam body 20 and the first beam body 10 is used to accommodate the battery cell or module unit. In the embodiment provided in the present application, the second beam body 20 includes four second beam bodies 20, which are arranged in parallel in the frame of the battery pack shell. Both ends of each second beam body 20 are fixedly connected to the inner side wall of the first beam body 10. The space between two adjacent second beam bodies 20 and between the second beam bodies 20 on both sides and the first beam body 10 parallel thereto is used to accommodate the battery cell or module unit. Multiple battery cells or module units are separated by the second beam body 20, so that the battery cell or module unit can be stably fixed in the battery pack shell, avoiding the occurrence of battery pack safety problems. The battery pack shell composed of the first beam body 10 and the second beam body 20 uses a smaller volume space to give the battery pack the same or even better protection, thereby improving the overall volume utilization of the battery pack.

In other embodiments, the number of the second beams 20 can be set according to the size of the battery pack and installation requirements, and is not limited to four, and is not limited here.

As shown in Figure 2, the first beam body 10 includes a frame body 11 and a dividing surface 12, and the dividing surface 12 divides the frame body 11 into a first cavity 13 and a second cavity 14. In the embodiment provided in the present application, the first cavity 13 and the second cavity 14 are both closed cavities. The frame body 11 structure with the first cavity 13 and the second cavity 14 has good strength while ensuring the lightweight of the first beam body 10.

Specifically, the frame 11 includes a first wall 111 and a second wall 112 arranged in parallel, and a third wall 113 and a fourth wall 114 arranged in parallel. The first wall 111, the third wall 113, the second wall 112 and the fourth wall 114 are sequentially connected to form the frame 11, wherein:

The first wall 111 is a straight wall, and the second wall 112 includes a first side surface 1121 and a second side surface 1122. The first end of the first side surface 1121 is connected to one end of the third wall 113, and the second end of the first side surface 1121 is integrally formed with the first end of the dividing surface 12. The second end of the dividing surface 12 is fixedly connected to the first wall 111 after being bent, and the first end of the second side surface 1122 is connected to one end of the fourth wall 114, and the second end of the second side surface 1122 is fixedly connected to the dividing surface 12 after being bent.

The first wall surface 111 is a vertical wall surface extending in the direction of gravity, the second wall surface 112 is arranged parallel to the first wall surface 111, the third wall surface 113 and the fourth wall surface 114 are both vertically connected to the first wall surface 111 and the second wall surface 112, and the second end of the first side surface 1121 and the first end of the dividing surface 12 are integrally formed at a connection with a bending angle. When a car collides, the connection structure with the bending angle can buffer the impact and help avoid fracture at the connection. Similarly, the second end of the dividing surface 12 is bent and fixedly connected to the first wall surface 111, and the second end of the second side surface 1122 is bent and fixedly connected to the dividing surface 12, which is also to avoid fracture at the connection when the car collides, thereby improving the strength of the first beam body 10.

In other embodiments, a connection hole may be opened on the third wall surface 113 or the fourth wall surface 114 as needed, so that the first beam body 10 can be easily connected to a required position.

In order to further improve the strength of the first beam body 10 , the dividing surface 12 is set as an inclined surface. The inclined dividing surface 12 is beneficial to improving the strength of the frame body 11 , thereby improving the strength of the first beam body 10 .

3, the second beam body 20 includes two symmetrically arranged connecting bodies 21, the connecting body 21 includes an opening section 211, a first stage 212 and a second stage 213 connected in sequence. After the two connecting bodies 21 are fixedly connected, A third cavity 22 is formed between the two opening sections 211. In the embodiment provided in the present application, the cross-section of the second beam body 20 formed by connecting the two connecting bodies 21 is a convex structure. The third cavity 22 formed by connecting the two opening sections 211 is beneficial to improving the strength and rigidity of the second beam body 20. A first stage 212 and a second stage 213 are respectively distributed on both sides of the third cavity 22. The first stage 212 and the second stage 213 are used to carry battery cells or module units. In order to enable the battery to stably carry the first stage 212 and the second stage 213, the distance between two adjacent second beam bodies 20 can be set according to the size of the battery.

In order to further enhance the firmness and safety of the battery pack after being installed in the battery pack shell, as shown in FIG. 1 , the battery pack shell also includes a bottom plate 30, and the first beam body 10 and the second beam body 20 are both fixed on the bottom plate 30. In the embodiment provided in the present application, the fourth wall surface 114 of each first beam body 10 is welded to the bottom plate 30, and the second stage 213 of each second beam body 20 is welded to the bottom plate 30, so that the entire battery pack shell is fixed on the bottom plate 30. When the battery cell or module unit is installed in the battery pack shell, the bottom plate 30 can provide support for the battery cell or module unit, so that the battery pack can be more stably installed in the battery pack shell.

After the battery pack is installed in the battery pack shell, it needs to be assembled to the vehicle body. Directly connecting the battery pack shell to the vehicle body is prone to cause safety accidents due to loose assembly. Therefore, as shown in FIG. 1 , at least one third beam 40 is provided on the frame of the battery pack shell. The third beam 40 is a mounting beam used to firmly assemble the battery pack shell to the vehicle body. In the embodiment provided in the present application, the third beam 40 includes two beams, which are symmetrically arranged on both sides of the battery pack shell frame and fixedly connected to the first beam 10 on the corresponding side. In other embodiments, the number of the third beams 40 can be set according to the assembly environment and assembly requirements.

In order to ensure that the battery pack shell is lightweight while improving strength and rigidity, the first beam body 10 and the second beam body 20 are both made of roll-formed steel. In the embodiment provided in the present application, the first beam body 10 and the second beam body 20 are made of roll-formed steel. The strength of the battery pack shell made of roll-formed steel can reach 800MPa-1500MPa. In addition, the complex cross-sectional characteristics of the first beam body 10 and the second beam body 20 greatly improve the rigidity and strength of the battery pack shell. In a feasible implementation, the thickness of the roll-formed steel is 1.0-2.0mm, and the preferred thickness is 1.2mm, 1.5mm and 1.8mm.

The present invention provides a vehicle, including the aforementioned battery pack housing, after which the battery pack is installed in the battery pack housing and assembled in the vehicle body, and since the battery pack housing is lightweight, it is beneficial to improve the lightweight of the vehicle. When the vehicle collides, due to the complex profile cross-section and material strength improvement of the first beam body 10 and the second beam body 20, the strength of the battery pack housing in the direction perpendicular to the first beam body 10 is improved, which is beneficial to reduce the deformation of the battery pack during the collision, providing good safety protection for the battery pack, and thus protecting the safety of the vehicle.

The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims (8)

A battery pack housing, characterized by comprising: A first beam body, wherein the first beam body comprises a plurality of first beam bodies, and the plurality of first beam bodies enclose a battery pack housing frame; A second beam body, wherein the second beam body comprises a plurality of second beam bodies, the plurality of second beam bodies are arranged in parallel in the frame of the battery pack shell, and the space between adjacent second beam bodies and between the second beam body and the first beam body is used to accommodate a battery cell or module unit; The first beam body includes a frame body and a dividing surface, and the dividing surface divides the frame body into a first cavity and a second cavity; The frame includes a first wall and a second wall arranged in parallel, and a third wall and a fourth wall arranged in parallel, wherein the first wall, the third wall, the second wall and the fourth wall are sequentially connected to form the frame, wherein: The first wall surface is a straight wall surface, the second wall surface includes a first side surface and a second side surface, the first end of the first side surface is connected to one end of the third wall surface, the second end of the first side surface is integrally formed with the first end of the dividing surface, the second end of the dividing surface is fixedly connected to the first wall surface after being bent, the first end of the second side surface is connected to one end of the fourth wall surface, and the second end of the second side surface is fixedly connected to the dividing surface after being bent. The battery pack shell according to claim 1 is characterized in that the dividing surface is an inclined surface. The battery pack shell according to claim 1 is characterized in that the second beam body includes two symmetrically arranged connecting bodies, the connecting body includes an opening section, a first stage and a second stage connected in sequence, and after the two connecting bodies are fixedly connected, a third cavity is formed between the two opening sections. The battery pack shell according to claim 1 is characterized in that the battery pack shell also includes a bottom plate, and the first beam body and the second beam body are both fixed to the bottom plate. The battery pack shell according to claim 1 is characterized in that at least one third beam is provided on the frame of the battery pack shell, and the third beam is used to install the battery pack shell on the vehicle body. The battery pack shell according to claim 1 is characterized in that the first beam body and the second beam body are both made of roll-formed steel. The battery pack shell according to claim 6 is characterized in that the roll-formed steel has a thickness of 1.0-2.0 mm. A vehicle, characterized by comprising a battery pack casing as described in any one of claims 1-7.