Battery pack housing and vehicle

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

[0001] The present invention relates to the technical field of manufacturing battery pack shells for electric vehicles, and in particular to a battery pack shell and a vehicle. Background Art

[0002] 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 attracting consumers' attention. There are currently two main solutions for traditional battery pack shells:

[0003] The first method uses 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, the stamped sheet metal is a single-layer structure, and its stiffness, strength and overall package modality need to be improved through additional welded reinforcement beams. This makes the sheet metal shell usually heavier and the applicable power range and size space limited. Another steel shell process derived from sheet metal stamping shells is bending and welding shells, which solves the problem that large-sized 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.

[0004] The second method uses aluminum profiles for welded housings. These components are typically formed through extrusion and die-casting, then welded together using methods such as friction stir welding and arc welding. Extruded profiles can be formed into complex cross-sections, resulting in superior strength and modal properties compared to sheet metal housings. Their dimensional adaptability allows them to meet diverse housing size requirements. However, aluminum's raw material sourcing suffers from high energy consumption, resulting in higher costs.

[0005] Application Contents

[0006] 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 lightness while having good rigidity and strength.

[0007] In a first aspect, the present invention provides a battery pack housing, comprising:

[0008] A first beam body, comprising a plurality of first beam bodies, wherein the plurality of first beam bodies enclose a frame of a battery pack shell;

[0009] The second beam body includes a plurality of second beam bodies, and the plurality of second beam bodies are arranged in parallel within the frame of the battery pack shell. 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.

[0010] 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.

[0011] In the battery pack shell as described above, 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:

[0012] 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.

[0013] In the battery pack shell as described above, preferably, the dividing surface is an inclined surface.

[0014] A battery pack shell as described above, wherein preferably, the second beam body includes two symmetrically arranged connectors, the connectors include an opening section, a first stage and a second stage connected in sequence, and after the two connectors are fixedly connected, a third cavity is formed between the two opening sections.

[0015] In the battery pack housing as described above, preferably, the battery pack housing further includes a bottom plate, and the first beam body and the second beam body are both fixed on the bottom plate.

[0016] In the battery pack housing as described above, preferably, at least one third beam is provided on the frame of the battery pack housing, and the third beam is used to install the battery pack housing on a vehicle body.

[0017] 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.

[0018] In the battery pack shell as described above, preferably, the roll-formed steel has a thickness of 1.0-2.0 mm.

[0019] In a second aspect, the present invention provides a vehicle comprising the aforementioned battery pack housing.

[0020] Compared with the existing technology, the present invention utilizes a first beam to form the frame of the battery pack shell, and arranges multiple second beams within 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

[0021] FIG1 is a perspective view of a battery pack housing of the present invention;

[0022] FIG2 is a schematic structural diagram of a first beam body of the present invention;

[0023] FIG3 is a schematic structural diagram of the second beam body of the present invention.

[0024] Explanation of the accompanying drawings: 10-first beam, 11-frame, 111-first wall, 112-second wall, 1121-first side, 1122-second side, 113-third wall, 114-fourth wall, 12-dividing surface, 13-first cavity, 14-second cavity; 20-second beam, 21-connecting body, 211-opening section, 212-first stage, 213-second stage, 22-third cavity; 30-bottom plate; 40-third beam. Modes for Carrying Out the Invention

[0025] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0026] 1 , the present invention provides a battery pack housing, comprising a first beam body 10 and a second beam body 20, wherein:

[0027] The first beam body 10 includes a plurality of first beam bodies 10 , which enclose and form 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.

[0028] The second beams 20 include multiple, parallel sections arranged within the battery pack housing frame. The spaces between adjacent second beams 20 and between the second beams 20 and the first beam 10 are used to accommodate battery cells or module units. In the embodiment provided herein, the second beams 20 include four, parallel sections arranged within the battery pack housing frame. Both ends of each second beam 20 are fixedly connected to the inner sidewalls of the first beam 10. The spaces between two adjacent second beams 20 and between the second beams 20 on either side and the parallel first beams 10 are used to accommodate battery cells or module units. The multiple battery cells or module units are separated by the second beams 20, allowing the battery cells or module units to be stably fixed within the battery pack housing, thereby avoiding battery pack safety issues. The battery pack housing formed by the first and second beams 10, 20, utilizes a smaller volume to provide the same or even better protection to the battery pack, thereby improving the overall volume utilization of the battery pack.

[0029] 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.

[0030] As shown in Figure 2, the first beam body 10 includes a frame body 11 and a dividing surface 12. 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.

[0031] 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:

[0032] 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 bent and fixedly connected to the first wall 111. 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 bent and fixedly connected to the dividing surface 12.

[0033] The first wall 111 is a vertical wall extending in the direction of gravity. The second wall 112 is arranged parallel to the first wall 111. The third wall 113 and the fourth wall 114 are both perpendicularly connected to the first wall 111 and the second wall 112. 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 cushion the impact and help prevent the connection from breaking. Similarly, the second end of the dividing surface 12 is bent and fixedly connected to the first wall 111, and the second end of the second side surface 1122 is bent and fixedly connected to the dividing surface 12, also to prevent the connection from breaking in the event of a car collision, thereby improving the strength of the first beam body 10.

[0034] 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.

[0035] 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 and further improving the strength of the first beam body 10 .

[0036] As shown in Figure 3, the second beam body 20 includes two symmetrically arranged connectors 21, and the connector 21 includes an opening section 211, a first stage 212 and a second stage 213 connected in sequence. After the two connectors 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 after the two connectors 21 are connected is a convex structure. The third cavity 22 formed by 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 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 the two adjacent second beam bodies 20 can be set according to the size of the battery.

[0037] In order to further enhance the firmness and safety of the battery pack after it is installed in the battery pack shell, as shown in Figure 1, the battery pack shell also includes a base plate 30, and the first beam body 10 and the second beam body 20 are both fixed on the base plate 30. In the embodiment provided in the present application, the fourth wall 114 of each first beam body 10 is welded to the base plate 30, and the second stage 213 of each second beam body 20 is welded to the base plate 30, so that the entire battery pack shell is fixed on the base plate 30. When the battery cell or module unit is installed in the battery pack shell, the base 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.

[0038] After the battery pack is installed in the battery pack housing, it needs to be assembled to the vehicle body. Directly connecting the battery pack housing to the vehicle body can easily lead to safety accidents due to loose assembly. Therefore, as shown in Figure 1, at least one third beam 40 is provided on the battery pack housing frame. The third beam 40 is a mounting beam used to securely assemble the battery pack housing to the vehicle body. In the embodiment provided in this application, the third beam 40 includes two, symmetrically arranged on both sides of the battery pack housing frame, and fixedly connected to the first beam 10 on the corresponding side. In other embodiments, the number of third beams 40 can be set according to the assembly environment and assembly requirements.

[0039] To ensure the battery pack shell is lightweight while improving its strength and rigidity, the first beam 10 and the second beam 20 are both made of roll-formed steel. In the embodiment provided in this application, the first beam 10 and the second beam 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 10 and the second beam 20 greatly improve the rigidity and strength of the battery pack shell. In one feasible embodiment, the thickness of the roll-formed steel is 1.0-2.0mm, with preferred thicknesses of 1.2mm, 1.5mm, and 1.8mm.

[0040] The present invention provides a vehicle comprising the aforementioned battery pack housing. After the battery pack is installed in the battery pack housing, it is assembled within the vehicle body. The lightweight battery pack housing further contributes to the vehicle's lightweight design. In the event of a collision, the complex cross-sections and increased material strength of the first and second beams 10 and 20 increase the strength of the battery pack housing in a direction perpendicular to the first beam 10. This helps reduce the deformation of the battery pack during a collision, providing excellent safety protection for the battery pack and, in turn, protecting the vehicle.

[0041] 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 scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A battery pack housing, characterized in that: include: 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.

2. The battery pack housing according to claim 1, characterized in that: The dividing surface is an inclined surface.

3. The battery pack housing according to claim 1, characterized in that: The second beam body includes two symmetrically arranged connecting bodies, and the connecting body includes an opening section, a first stage and a second stage connected in sequence. After the two connecting bodies are fixedly connected, a third cavity is formed between the two opening sections.

4. The battery pack housing according to claim 1, 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 on the bottom plate.

5. The battery pack housing according to claim 1, 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.

6. The battery pack housing according to claim 1, characterized in that: The first beam body and the second beam body are both made of roll-formed steel.

7. The battery pack casing according to claim 6, characterized in that: The roll-formed steel has a thickness of 1.0-2.0 mm.

8. A vehicle, characterized in that: A battery pack casing comprising any one of claims 1-7.

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