Battery pack case for vehicle
The vehicle battery pack case design with steel or aluminum frame portions and friction stir welding addresses thermal deformation issues, reducing costs and improving durability through stable connections.
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- HWASHIN CO LTD
- Filing Date
- 2024-09-27
- Publication Date
- 2026-07-21
AI Technical Summary
The existing vehicle battery pack cases face issues of thermal deformation during welding, which affects durability and increases manufacturing costs due to the need for costly and complex assembly processes.
A vehicle battery pack case design featuring a first, second, third, and fourth frame portions made of steel or aluminum, with hollow structures and reinforcement materials, connected through friction stir welding to minimize thermal deformation and maintain a stable connection state.
Prevents thermal deformation during welding, reduces manufacturing costs, and enhances durability by minimizing correction needs, while maintaining a solid and watertight connection.
Smart Images
Figure R1020240132079_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a vehicle battery pack case, and more specifically, to a vehicle battery pack case capable of preventing thermal deformation during welding. Background Technology
[0003] Recently, due to environmental issues, the development of hybrid and electric vehicles is increasing.
[0004] In particular, regarding the technological development for the lightweighting of electric vehicle components, there is a need to change the materials of battery cases that support electric vehicle batteries, and to modify the connection structure between components to improve productivity and durability.
[0005] The battery case features a detachable outer frame. Consequently, the assembly process is implemented using methods such as welding between components. This results in issues regarding cost and durability. Therefore, there is a need to improve this.
[0006] The background technology of the present invention is disclosed in Korean Registered Patent Publication No. 10-2027124 (Registered September 25, 2019, Title of Invention: Mounting Structure for Battery Pack for Electric Vehicle). The problem to be solved
[0008] The present invention was created to solve the above-mentioned problems, and the objective of the present invention is to provide a vehicle battery pack case capable of preventing thermal deformation during welding. means of solving the problem
[0010] A vehicle battery pack case according to the present invention may include: a first frame portion consisting of a spaced-apart pair; a pair of second frame portions each connected to the pair of first frame portions at a step; a third frame portion connecting the spaced-apart pair of first frame portions; and a fourth frame portion connecting the spaced-apart pair of second frame portions and protruding outward from the opposite side of the third frame portion.
[0011] The above-mentioned fourth frame section may include a pair of fourth main frame sections each connected to a pair of second frame sections; a fourth protruding frame section spaced apart from the fourth main frame section and protruding to the opposite side of the third frame section; and a pair of fourth connecting frame sections connecting the fourth main frame section and the fourth protruding frame section.
[0012] The above-mentioned fourth connecting frame part can be connected to the above-mentioned fourth main frame part and the above-mentioned fourth protruding frame part at an obtuse angle to each other.
[0013] The fourth frame portion may further include a bead portion of a set thickness formed by welding the fourth connecting frame portion and the fourth main frame portion, and the fourth connecting frame portion and the fourth protruding frame portion, respectively.
[0014] The above bead portion may be formed on the side facing the third frame portion and on the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth main frame portion.
[0015] The above bead portion may be formed on the side facing the third frame portion and on the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth protruding frame portion.
[0016] The first frame part and the second frame part, the second frame part and the fourth frame part, and the first frame part and the third frame part can each be welded together. Effects of the invention
[0018] According to the vehicle battery pack case of the present invention, thermal deformation can be prevented during welding in the first to fourth frame portions.
[0019] In addition, according to the present invention, quality control can be facilitated by reducing the amount of correction due to the reduction of thermal deformation. Brief explanation of the drawing
[0021] FIG. 1 is a schematic perspective view showing a vehicle battery pack case according to one embodiment of the present invention. FIG. 2 is a partially enlarged perspective view schematically showing "A" of FIG. 1. Figure 3 is a partially enlarged perspective view schematically showing "A" of Figure 1 from the opposite direction. Figure 4 is a cross-sectional view schematically showing the BB of Figure 1. FIG. 5 is a schematic plan view showing a vehicle battery pack case according to one embodiment of the present invention. Specific details for implementing the invention
[0022] A vehicle battery pack case according to the present invention will be described below with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation.
[0023] Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these may vary depending on the intent or practice of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.
[0025] FIG. 1 is a perspective view schematically showing a vehicle battery pack case according to one embodiment of the present invention, FIG. 2 is a partially enlarged perspective view schematically showing "A" of FIG. 1, FIG. 3 is a partially enlarged perspective view schematically showing "A" of FIG. 1 from the opposite direction, FIG. 4 is a cross-sectional view schematically showing BB of FIG. 1, and FIG. 5 is a plan view schematically showing a vehicle battery pack case according to one embodiment of the present invention.
[0026] Referring to FIGS. 1 to 5, a vehicle battery pack case according to one embodiment of the present invention may include a first frame portion (100), a second frame portion (200), a third frame portion (300), and a fourth frame portion (400).
[0027] Each of the first frame section (100), second frame section (200), third frame section (300), and fourth frame section (400) may be made of steel. Each of the first frame section (100), second frame section (200), third frame section (300), and fourth frame section (400) is made of steel, thereby reducing manufacturing costs and maintaining a certain strength.
[0028] Alternatively, each of the first frame section (100), second frame section (200), third frame section (300), and fourth frame section (400) may be made of aluminum material. Each of the first frame section (100), second frame section (200), third frame section (300), and fourth frame section (400) may be made of aluminum material, thereby reducing the weight of the vehicle and improving fuel efficiency.
[0029] The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) can each be formed as hollow. The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) can each be formed as hollow to reduce the weight of the vehicle. Reinforcement materials can be installed inside the hollow first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400).
[0030] The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) can each be joined by welding a connecting part. The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) can be connected by spot welding. The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) can be manufactured by friction stir welding during spot welding.
[0031] Friction Stir Welding (FSW) is a solid-state joining process in which the first frame part (100), the second frame part (200), the third frame part (300), and the fourth frame part (400) are welded using frictional heat. Compared to fusion welding such as arc welding, laser welding, and electron beam welding, cracking does not occur and thermal deformation due to welding can occur less.
[0032] The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) are spot welded so that thermal deformation can be minimized. The first frame section (100), the second frame section (200), the third frame section (300), and the fourth frame section (400) are formed in a rectangular shape, and a battery (not shown) of an electric vehicle or a hybrid vehicle can be placed in the internal space.
[0033] The first frame section (100) may consist of a spaced-apart pair. The first frame section (100) may include a first main frame section (110) and a first reinforcing section (120). The first main frame section (110) may consist of a spaced-apart pair.
[0034] The first main frame section (110) may be formed as a hollow type. A reinforcing material may be installed inside the hollow first main frame section (110).
[0035] The first reinforcing member (120) can be mounted on each first main frame member (110). The first reinforcing member (120) can be mounted on the opposite side of the space where the battery is placed. The first reinforcing member (120) is mounted on the outer surface of the first main frame member (110) to reinforce the strength of the first main frame member (110) and to protect the battery in the internal space from external impact.
[0036] The second frame section (200) may consist of a pair of first frame sections (100) each connected at a step. The second frame section (200) may be connected inwardly at a step from each first frame section (100).
[0037] The second frame section (200) may include a second main frame section (210) and a second reinforcing section (220). The second main frame section (210) may consist of a spaced-apart pair. The second main frame section (210) may be connected inwardly in a stepped manner from each of the first main frame sections (110).
[0038] The second main frame section (210) may be formed in a hollow shape. A reinforcing material may be installed inside the hollow second main frame section (210).
[0039] The second reinforcing member (220) can be mounted on each second main frame member (210). The second reinforcing member (220) can be mounted on the inner side of the second main frame member (210). The second reinforcing member (220) can be mounted on the inner side of the second main frame member (210) to reinforce the strength of the second main frame member (210).
[0040] The third frame section (300) can connect a pair of spaced-apart first frame sections (100). The third frame section (300) can connect the end (left end based on FIG. 1) of the first main frame section (110) of the pair of spaced-apart first frame sections (100).
[0041] The third frame part (300) may be formed as a hollow type. A reinforcing material may be installed inside the hollow third frame part (300).
[0042] The fourth frame section (400) can connect a pair of spaced-apart second frame sections (200). The fourth frame section (400) can connect the end (right end in Fig. 1) of the second main frame section (210) of the pair of spaced-apart second frame sections (200). The fourth frame section (400) can be formed to protrude to the opposite side of the third frame section (300).
[0043] The fourth frame section (400) may include a fourth main frame section (410), a fourth protruding frame section (420), and a fourth connecting frame section (430). The fourth main frame section (410) may be composed of a pair of parts each connected to a pair of second frame sections (200).
[0044] The fourth protruding frame part (420) is spaced apart from the fourth main frame part (410) and can protrude to the opposite side of the third frame part (300) (right side in Fig. 1). The fourth protruding frame part (420) protrudes to the opposite side of the third frame part (300) (right side in Fig. 1) to extend the impact time transmitted to the battery from external impact and protect against impact.
[0045] The fourth connecting frame section (430) may be formed as a pair connecting the fourth main frame section (410) and the fourth protruding frame section (420). Based on FIG. 1, the fourth connecting frame section (430) may be formed as a pair connecting the fourth main frame section (410) and the fourth protruding frame section (420) on the left and connecting the fourth main frame section (410) and the fourth protruding frame section (420) on the right.
[0046] The fourth connecting frame section (430) can be connected to the fourth main frame section (410) and the fourth protruding frame section (420) at an obtuse angle, respectively. Referring to FIG. 2, the angle (θ1) between the fourth connecting frame section (430) and the fourth main frame section (410), and the angle (θ2) between the fourth connecting frame section (430) and the fourth protruding frame section (420) can each be obtuse angles. The fourth connecting frame section (430) is connected to the fourth main frame section (410) and the fourth protruding frame section (420) at an obtuse angle, thereby mitigating damage caused by external impact. The angle (θ1) between the fourth connecting frame part (430) and the fourth main frame part (410), and the angle (θ2) between the fourth connecting frame part (430) and the fourth protruding frame part (420) are formed as the same angle, but are not limited thereto and can be set as different angles.
[0047] The first main frame section (110), the fourth protruding frame section (420), and the fourth connecting frame section (430) may be formed as hollow. Reinforcement materials may be installed inside the hollow first main frame section (110), the fourth protruding frame section (420), and the fourth connecting frame section (430).
[0048] The fourth frame section (400) may further include a bead section (440). The bead section (440) may be formed with a set thickness by welding the fourth connecting frame section (430) and the fourth main frame section (410), and the fourth connecting frame section (430) and the fourth protruding frame section (420), respectively. The bead section (440) may be welded to the fourth connecting frame section (430) and the fourth main frame section (410), and the fourth connecting frame section (430) and the fourth protruding frame section (420), respectively, with a set length. The bead section (440) may be formed by spot welding. The bead section (440) may be formed in a wave shape.
[0049] The bead portion (440) can be formed by welding to the ends of the fourth connecting frame portion (430) and the fourth main frame portion (410), and the fourth connecting frame portion (430) and the fourth protruding frame portion (420), respectively, with a thickness of 10 mm. The welding length of the bead portion (440) can be formed according to the length of the connection portion between the fourth connecting frame portion (430) and the fourth main frame portion (410), and between the fourth connecting frame portion (430) and the fourth protruding frame portion (420). The bead portion (440) can be formed with a length of 20 mm.
[0050] Referring to FIG. 3, the bead portion (440) can be formed on the side facing the third frame portion (300) and on the opposite side of the third frame portion (300) at the connection portion between the fourth connecting frame portion (430) and the fourth main frame portion (410).
[0051] That is, in the present invention, the bead portion (440) can be formed over the entire connection portion between the fourth connecting frame portion (430) and the fourth main frame portion (410), and between the fourth connecting frame portion (430) and the fourth protruding frame portion (420).
[0052] The bead portion (440) is formed over the entire connection portion between the fourth connecting frame portion (430) and the fourth main frame portion (410), and between the fourth connecting frame portion (430) and the fourth protruding frame portion (420), so that a stable and solid connection state can be maintained overall.
[0053] In the present invention, the first frame part (100) and the second frame part (200), the second frame part (200) and the fourth frame part (400), and the first frame part (100) and the third frame part (300) can each be welded together.
[0054] The end of the first main frame section (110) of the first frame section (100) and the end of the second main frame section (210) of the second frame section (200) can be welded together.
[0055] The end of the second main frame section (210) of the second frame section (200) and the end of the fourth main frame section (410) of the fourth frame section (400) can be welded together.
[0056] The end of the first main frame section (110) of the first frame section (100) and the end of the third frame section (300) can be welded together.
[0057] That is, the bent portions in the first frame portion (100), the second frame portion (200), the third frame portion (300), and the fourth frame portion (400), respectively, can be welded together. The bent portions in the first frame portion (100), the second frame portion (200), the third frame portion (300), and the fourth frame portion (400), respectively, are welded together to maintain a solid bonded state and also improve watertightness. In FIG. 5, each welded portion is shown as a welded portion (W).
[0058] In the present invention, the connecting portions of the bent parts in the first frame part (100), the second frame part (200), the third frame part (300), and the fourth frame part (400) are welded together to maintain a stable connection state, and spot welding is performed so that thermal deformation can be minimized.
[0059] According to the vehicle battery pack case of the present invention, thermal deformation can be prevented during welding in the first to fourth frame portions.
[0060] In addition, according to the present invention, quality control can be facilitated by reducing the amount of correction due to the reduction of thermal deformation.
[0062] Although specific embodiments of the present invention have been described above, the spirit and scope of the present invention are not limited to these specific embodiments, and various modifications and variations are possible within the scope of the essence of the present invention as described in the claims by those skilled in the art without altering the essence of the present invention. Explanation of the symbols
[0064] 100: 1st Frame Section 110: 1st Main Frame Section 120: 1st reinforcement section 200: 2nd frame section 210: 2nd Main Frame Section 220: 2nd Reinforcement Section 300: 3rd frame section 400: 4th frame section 410: 4th Main Frame Section 420: 4th Protruding Frame Section 430: 4th connecting frame section 440: Bead section
Claims
Claim 1 A first frame section comprising a spaced-apart pair; a pair of second frame sections each connected to the pair of first frame sections in a stepped manner; a third frame section connecting the spaced-apart pair of first frame sections; and a fourth frame section connecting the spaced-apart pair of second frame sections and formed to protrude to the opposite side of the third frame section, wherein the fourth frame section comprises: a pair of fourth main frame sections each connected to the pair of second frame sections; a fourth protruding frame section spaced apart from the fourth main frame section and protruding to the opposite side of the third frame section; and a pair of fourth connecting frame sections connecting the fourth main frame section and the fourth protruding frame section. A vehicle battery pack case comprising a fourth connecting frame portion and a fourth main frame portion, and a bead portion of a set thickness formed by welding the fourth connecting frame portion and the fourth protruding frame portion, wherein the fourth connecting frame portion is connected to the fourth main frame portion and the fourth protruding frame portion at an obtuse angle, and the bead portion is formed on the side facing the third frame portion and the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth main frame portion, and is formed on the side facing the third frame portion and the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth protruding frame portion, and is formed on the side facing the third frame portion and the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth protruding frame portion, and is formed on the side facing the third frame portion and the opposite side of the third frame portion at the connection portion between the fourth connecting frame portion and the fourth protruding frame portion, so as to suppress thermal deformation occurring during welding. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 A vehicle battery pack case according to claim 1, characterized in that the first frame part and the second frame part, the second frame part and the fourth frame part, and the first frame part and the third frame part are each welded together.