High-strength steel battery lower shell with flange structure

Abstract

The utility model relates to a high -strength steel battery lower shell with flanging structure, include: frame welding assembly, at least one first crossbeam, at least one second crossbeam, frame welding assembly, first crossbeam, second crossbeam material are all high -strength steel, and the both ends of first crossbeam, second crossbeam all are provided with flanging structure symmetrically and are through the mechanical connection of welding mode with frame welding assembly through flanging structure and carry out welding and be used for improving its connecting strength, the utility model discloses reasonable in structure design, high strength, good mechanical property, through the structure and the connecting process design improvement of crossbeam and bottom plate, improved the connection reliability, good economy, solved high -strength steel connecting process problem, satisfied the user specific demand.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicle manufacturing technology and relates to a high-strength steel battery lower shell with a flanged structure. Background Technology

[0002] With the rapid development of new energy vehicle manufacturing technology, the application of batteries in new energy vehicles is becoming increasingly widespread. The requirements for the driving range of new energy vehicles are also constantly increasing, as are the demands for the number and energy density of batteries. Due to the significant weight of batteries, existing battery casing structures are increasingly unable to meet user requirements. Current technologies utilize traditional steel or aluminum alloy lower casings. Traditional steel lower casings often employ cold rolling to shape the cross-section, which requires complex cross-sectional designs to achieve ideal strength due to the low strength of the material, resulting in a relatively heavy casing. Aluminum alloy battery lower casings are also quite expensive. As user demands for safety performance continue to rise, high-strength steel is increasingly used in battery casings. To improve safety and reliability, existing connection processes and structures are no longer suitable, leading to continuous innovation and improvement in connection processes. Therefore, a new type of high-strength steel battery lower casing with a novel connection structure is needed to solve the aforementioned problems. Utility Model Content

[0003] The purpose of this utility model is to provide a high-strength steel battery lower casing with a flanged structure. The frame welding assembly is made of high-strength steel, which has high strength and good mechanical properties. Through the improvement of the structure and connection process design of the crossbeam and the bottom plate, the problem of high-strength steel connection process is solved, and the specific needs of users are met.

[0004] To achieve the above objectives, embodiments of this utility model provide a high-strength steel battery lower casing with a flanged structure, comprising: a frame welding assembly, at least one first crossbeam, and at least one second crossbeam. The frame welding assembly, the first crossbeam, and the second crossbeam are all made of high-strength steel. Both ends of the first crossbeam and the second crossbeam are symmetrically provided with several flanged structures, which are mechanically connected to the frame welding assembly by welding to improve their connection strength.

[0005] Furthermore, the first crossbeam is symmetrically provided with a first flange, a second flange, and a third flange at both ends. The first flange and the third flange are symmetrically provided on both sides of any one end of the first crossbeam, and the second flange is located on the upper side of any one end of the first crossbeam. The first flange, the second flange, and the third flange are all connected to the frame welded assembly by welding to improve the strength and rigidity of the frame welded assembly. The second crossbeam is symmetrically provided with a fourth flange, a fifth flange, and a sixth flange at both ends. The fourth flange and the sixth flange are symmetrically provided on both sides of any one end of the second crossbeam, and the fifth flange is located on the upper side of any one end of the second crossbeam. The fourth flange, the fifth flange, and the sixth flange are all connected to the frame welded assembly by welding to improve the strength and rigidity of the frame welded assembly.

[0006] Furthermore, the frame welding assembly includes: two first frames, two second frames, a third frame, and a fourth frame. The two first frames are arranged in parallel relative to each other, the third frame and the fourth frame are arranged in parallel relative to each other, and the two second frames are symmetrically arranged along the center line of the frame welding assembly. The first frame, the second frame, the third frame, and the fourth frame are all connected by welding to form a closed polygonal frame structure. The first flange, the second flange, and the third flange are all mechanically connected to the first frame by welding, and the fourth flange, the fifth flange, and the sixth flange are all connected to the second frame by welding.

[0007] Furthermore, the first frame, the second frame, the third frame, the fourth frame, the first crossbeam, and the second crossbeam are all hollow structures used to achieve weight reduction.

[0008] Furthermore, it also includes: a base plate, which is located below the frame welding assembly, the first crossbeam, and the second crossbeam and is mechanically connected to the first crossbeam and the second crossbeam respectively, and the base plate is mechanically connected to the frame welding assembly by riveting and applying sealant.

[0009] Furthermore, the base plate and the frame welding assembly are riveted together by a number of rivets, which are pull rivets.

[0010] Preferably, the high-strength steel has a yield strength of 960 MPa to 1700 MPa and a tensile strength of 980 MPa to 1700 MPa.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This utility model relates to a high-strength steel battery lower shell structure with a flanged structure. The structure is reasonably designed, and the frame welding assembly and crossbeam are made of high-strength steel, which has high strength and good mechanical properties. Through the improvement of the structure and connection process design of the crossbeam and the bottom plate, the connection reliability is improved, the economy is good, the connection process problem of high-strength steel is solved, and the specific needs of users are met. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0014] Figure 1 A three-dimensional structural diagram of the lower casing of a high-strength steel battery with a flanged structure provided in an embodiment of this utility model;

[0015] Figure 2 A top view of the lower casing of a high-strength steel battery with a flanged structure provided in an embodiment of this utility model;

[0016] Figure 3 A three-dimensional structural diagram of the lower casing of a high-strength steel battery with a flanged structure provided in an embodiment of this utility model;

[0017] Figure 4 A three-dimensional structural diagram of the first crossbeam provided in an embodiment of this utility model;

[0018] Figure 5 A three-dimensional structural diagram of the second crossbeam provided for an embodiment of this utility model.

[0019] In the picture:

[0020] 1. Frame welding assembly; 101. First frame; 102. Second frame; 103. Third frame; 104. Fourth frame; 2. Base plate; 3. First crossbeam; 301. First flange; 302. Second flange; 303. Third flange; 4. Second crossbeam; 401. Fourth flange; 402. Fifth flange; 403. Sixth flange; 5. Rivets. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. It should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The following is a detailed description of a high-strength steel battery lower casing with a flanged structure according to an embodiment of the present invention, with reference to the accompanying drawings.

[0025] Example:

[0026] Figure 1 This diagram shows a three-dimensional structure of the lower casing of a high-strength steel battery with a flanged structure provided in an embodiment of the present invention. Figure 2 This shows a top view of the lower casing of a high-strength steel battery with a flanged structure provided in an embodiment of the present invention; Figure 3 This invention provides a three-dimensional structural diagram of the lower casing of a high-strength steel battery with a flanged structure according to an embodiment of the present invention. Figure 4 A schematic diagram of the three-dimensional structure of the first crossbeam provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the three-dimensional structure of the second crossbeam provided in an embodiment of this utility model is shown. Figures 1 to 5As shown in the figure, the high-strength steel battery lower casing with a flanged structure provided by this utility model embodiment is made of high-strength steel and manufactured by local heating and rolling, resulting in high strength, good mechanical properties, and a simple rolling cross section. The local heating method for the high-strength steel can be laser-assisted heating or other local heating methods. The high-strength steel battery lower casing with a flanged structure provided by this utility model embodiment includes: a frame welded assembly 1, at least one first crossbeam 3, and at least one second crossbeam 4. Both beam 3 and the second crossbeam 4 are made of high-strength steel. The yield strength of this high-strength steel is 960 MPa to 1700 MPa, and its tensile strength is 980 MPa to 1700 MPa. Its mechanical properties are significantly superior to traditional ordinary steel, greatly improving the strength of the battery's lower casing and enhancing safety and reliability. Compared to aluminum alloy, it also offers higher strength and better economic efficiency. Both ends of the first crossbeam 3 and the second crossbeam 4 are symmetrically equipped with several flanged structures, which are mechanically connected to the frame welding assembly 1 by welding to improve connection strength. It is worth noting that this embodiment uses three first crossbeams 3 and one second crossbeam 4. Of course, users can add or remove beams according to specific needs and the specific structure of the battery's lower casing. There is no specific limitation on the number of first crossbeams 3 and second crossbeams 4 used here.

[0027] In the high-strength steel battery lower casing with flanged structure provided in this embodiment of the utility model, more specifically, a first flange 301, a second flange 302, and a third flange 303 are symmetrically arranged at both ends of the first crossbeam 3. The first flange 301, the second flange 302, and the third flange 303 form a variety of flanged structures on the first crossbeam 3. The first flange 301 and the third flange 303 are symmetrically arranged on both sides of any end of the first crossbeam 3, and the second flange 301 is located on the upper side of any end of the first crossbeam 3. The first flange 301, the second flange 302, and the third flange 303 are all connected to the frame welding assembly 1 by welding. To improve the strength and rigidity of the frame welded assembly 1, a fourth flange 401, a fifth flange 402, and a sixth flange 403 are symmetrically arranged at both ends of the second crossbeam 4. These flanges form a variety of flange structures on the second crossbeam 4. The fourth flange 401 and the sixth flange 403 are symmetrically arranged on both sides of any one end of the second crossbeam 4, and the fifth flange 401 is located on the upper side of any one end of the second crossbeam 4. All four flanges (401, 402, and 403) are connected to the frame welded assembly 1 by welding to improve its strength and rigidity. The welding method in this embodiment can be laser welding, argon arc welding, or other methods, including but not limited to the aforementioned welding methods. It is worth noting that the angles between the first flange 301, the second flange 302, the third flange 303, the fourth flange 401, the fifth flange 402, and the sixth flange 403 and the corresponding crossbeam length direction (that is, the opening angle of the flanges) can be set to any angle between 0 degrees and 90 degrees according to user requirements. Compared with the traditional method of direct welding without flanges, this greatly improves the welding strength, has good welding processability, and makes it easier to ensure the quality of the weld. It also improves the stress buffering effect on the lower battery casing during use. The flanges can be formed by local heating methods such as laser-assisted heating and roll forming, or by other methods.

[0028] In the high-strength steel battery lower casing with flange structure provided in this embodiment of the utility model, more specifically, the frame welding assembly 1 includes: two first frames 101, two second frames 102, a third frame 103, and a fourth frame 104. The two first frames 101 are arranged relatively parallel, the third frame 103 and the fourth frame 104 are arranged relatively parallel, and the two second frames 102 are symmetrically arranged along the center line of symmetry along the length direction of the frame welding assembly 1. The first frames 101, second frames 102, third frames 103, and fourth frames 104 are all connected by welding to form a closed polygonal frame structure. The first flange 301, second flange 302, and third flange 303 are all mechanically connected to the first frame 101 by welding, and the fourth flange 401, fifth flange 402, and sixth flange 403 are all connected to the second frame 102 by welding. Thus, a reliable connection between the first crossbeam 3, the second crossbeam 4 and the frame welding assembly 1 is achieved, with high connection strength.

[0029] In the high-strength steel battery lower casing with a flanged structure provided in this embodiment of the invention, more specifically, the first frame 101, the second frame 102, the third frame 103, the fourth frame 104, the first crossbeam 3, and the second crossbeam 4 are all hollow structures to achieve weight reduction, while saving materials and achieving good economic efficiency. This hollow structure can be formed by hot rolling, or other forming methods can also be used. This hollow structure ensures the required strength for the frame welded assembly 1 to bear the load while saving materials.

[0030] The high-strength steel battery lower casing with a flanged structure provided in this embodiment of the invention further includes, as a design improvement, a base plate 2. The base plate 2 is located below the frame welding assembly 1, the first crossbeam 3, and the second crossbeam 4, and is mechanically connected to the first crossbeam 3 and the second crossbeam 4 respectively. The base plate 2 is mechanically connected to the frame welding assembly 1 by riveting and applying sealant. The sealant is applied at the contact points between the base plate 2 and the frame welding assembly 1, and is also applied around the bottom perimeter of the frame welding assembly 1. This combination of riveting and sealant connection improves the sealing performance of the battery lower casing and further enhances safety.

[0031] In the high-strength steel battery lower casing with a flanged structure provided in this embodiment of the utility model, as a further design improvement, the base plate 2 and the frame welding assembly 1 are riveted together by a number of rivets 5. The rivets 5 are pull rivets, and the material of the rivets 5 is preferably carbon steel, which improves the connection strength and corrosion resistance. This avoids the limitation that the high-strength steel frame welding assembly 1 cannot use the traditional FDS (full name FDS-Flow Drill Screw) riveting process due to its high strength, and solves the connection process problem of the high-strength steel battery lower casing with a flanged structure.

[0032] Compared with the prior art, the high-strength steel battery lower shell structure with flange structure involved in this utility model has a reasonable design. The frame welding assembly 1 and the crossbeam are made of high-strength steel, which has high strength and good mechanical properties. Through the improvement of the structure and connection process design of the crossbeam and the bottom plate 2, the connection reliability is improved, the economy is good, the connection process problem of high-strength steel is solved, and the specific needs of users are met.

[0033] The following points need to be explained:

[0034] (1) Unless otherwise defined, the same reference numerals in the embodiments of this utility model and the accompanying drawings have the same meaning.

[0035] (2) The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment. Other structures can refer to the general design.

[0036] (3) For clarity, some structures in the drawings used to describe embodiments of the present invention may be enlarged or reduced, that is, these drawings are not drawn to actual scale.

[0037] (4) Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A high-strength steel battery lower casing with a flanged structure, characterized in that, include: The frame welding assembly (1), at least one first crossbeam (3), and at least one second crossbeam (4) are all made of high-strength steel. Both ends of the first crossbeam (3) and the second crossbeam (4) are symmetrically provided with several flange structures, which are mechanically connected to the frame welding assembly (1) by welding through the flange structures to improve their connection strength.

2. The high-strength steel battery lower casing with a flanged structure according to claim 1, characterized in that, The first crossbeam (3) is symmetrically provided with a first flange (301), a second flange (302), and a third flange (303) at both ends. The first flange (301) and the third flange (303) are symmetrically provided on both sides of any end of the first crossbeam (3). The second flange (302) is located on the upper side of any end of the first crossbeam (3). The first flange (301), the second flange (302), and the third flange (303) are all connected to the frame welding assembly (1) by welding to improve the strength and rigidity of the frame welding assembly (1). The second crossbeam (4) is symmetrically provided with a fourth flange (401), a fifth flange (402), and a sixth flange (403) at both ends. The fourth flange (401) and the sixth flange (403) are symmetrically provided on both sides of any end of the second crossbeam (4). The fifth flange (402) is located on the upper side of any end of the second crossbeam (4). The fourth flange (401), the fifth flange (402), and the sixth flange (403) are all connected to the frame welding assembly (1) by welding to improve the strength and rigidity of the frame welding assembly (1).

3. The high-strength steel battery lower casing with a flanged structure according to claim 2, characterized in that, The frame welding assembly (1) includes: two first frames (101), two second frames (102), a third frame (103), and a fourth frame (104). The two first frames (101) are arranged in parallel relative to each other, and the third frame (103) and the fourth frame (104) are arranged in parallel relative to each other. The two second frames (102) are symmetrically arranged along the center line of the frame welding assembly (1). The first frame (101), the second frame (102), the third frame (103), and the fourth frame (104) are all connected by welding to form a closed polygonal frame structure. The first flange (301), the second flange (302), and the third flange (303) are all mechanically connected to the first frame (101) by welding. The fourth flange (401), the fifth flange (402), and the sixth flange (403) are all connected to the second frame (102) by welding.

4. The high-strength steel battery lower casing with a flanged structure according to claim 3, characterized in that, The first frame (101), the second frame (102), the third frame (103), the fourth frame (104), the first crossbeam (3), and the second crossbeam (4) are all hollow structures used to achieve weight reduction.

5. The high-strength steel battery lower casing with a flanged structure according to claim 1, characterized in that, Also includes: The base plate (2) is located below the frame welding assembly (1), the first crossbeam (3), and the second crossbeam (4) and is mechanically connected to the first crossbeam (3) and the second crossbeam (4) respectively. The base plate (2) is mechanically connected to the frame welding assembly (1) by riveting and applying sealant.

6. The high-strength steel battery lower casing with a flanged structure according to claim 5, characterized in that, The base plate (2) and the frame welding assembly (1) are riveted together by a number of rivets (5), the rivets (5) being pull rivets.

7. The high-strength steel battery lower casing with a flanged structure according to any one of claims 1-6, characterized in that, The high-strength steel has a yield strength of 960 MPa to 1700 MPa and a tensile strength of 980 MPa to 1700 MPa.

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