High-strength steel hot-rolled steel battery lower shell

Abstract

This utility model relates to a high-strength steel hot-rolled steel battery lower casing, comprising: a lower casing welded assembly and a bottom protective plate. The lower casing welded assembly is made of high-strength steel and includes: two first frames, a second frame, and a third frame. The two first frames are arranged parallel to each other, and the second and third frames are respectively located at both ends of the first frames and connected to the first frames by welding to form a cuboid shell structure. A plurality of rivet nuts are respectively riveted to the first, second, and third frames, and the rivet nuts are coated with sealant. The lower casing welded assembly is mechanically connected to the bottom protective plate and the module liquid cooling plate by bolts, which are set on the rivet nuts and mechanically connected to them. This utility model has a reasonable structural design, high strength, good mechanical properties, and a simple rolling section, making it particularly suitable for the trial production of multiple products. It solves the problem of high-strength steel connection process and saves high mold manufacturing costs.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicle manufacturing technology, the application of power 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 power batteries. Due to the significant weight of power batteries, the existing power battery casing structure is increasingly unable to meet user requirements. The traditional steel lower casing used in current technology employs cold rolling to shape the cross-section. Due to the low strength of the material, complex cross-sectional shapes are required to achieve the ideal strength, resulting in a relatively heavy casing. As users' requirements for safety performance continue to rise, high-strength steel is being used more and more in power battery casings. Existing connection processes are no longer suitable, leading to continuous innovation and improvement in connection processes and the trial production of various specifications. To reduce the high mold costs during the trial production of multiple products, a new type of high-strength steel hot-rolled 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 hot-rolled steel battery lower casing, wherein the lower casing welded assembly is made of high-strength steel and manufactured by local heating and rolling, which has high strength, good mechanical properties, and simple rolling cross section, effectively meeting the specific needs of users.

[0004] To achieve the above objectives, embodiments of this utility model provide a high-strength steel hot-rolled steel battery lower casing, comprising: a lower casing welded assembly and a bottom protective plate. The lower casing welded assembly is made of high-strength steel and includes: two first frames, a second frame, and a third frame. The two first frames are arranged parallel to each other. The second frame and the third frame are respectively located at both ends of the first frames and connected to the first frames by welding to form a cuboid shell structure. A plurality of rivet nuts are respectively riveted to the first frame, the second frame, and the third frame. The rivet nuts are coated with sealant. The lower casing welded assembly is mechanically connected to the bottom protective plate and the module liquid cooling plate by bolts. The bolts are located on the rivet nuts and are mechanically connected to the rivet nuts.

[0005] Furthermore, it also includes a sealing gasket made of an elastic material, which is disposed between the lower housing welded assembly and the bottom protective plate to improve sealing performance.

[0006] Furthermore, the lower housing welding assembly also includes a fourth frame, the two ends of which are respectively connected to the two first frames by welding to strengthen the lower housing welding assembly; a plurality of rivet nuts coated with sealant are riveted to the fourth frame, and the fourth frame is mechanically connected to the bottom protective plate and the module liquid cooling plate by bolts.

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

[0008] Furthermore, the high-strength steel has a yield strength of 960 MPa to 1700 MPa and a tensile strength of 980 MPa to 1700 MPa.

[0009] This utility model relates to a high-strength steel hot-rolled steel battery lower casing, with the following advantages: The high-strength steel hot-rolled steel battery lower casing of this utility model has a reasonable structural design. The lower casing welded assembly is made of high-strength steel and is manufactured by local heating and rolling, resulting in high strength, good mechanical properties, and a simple rolling cross section, making it particularly suitable for the trial production of multiple products. By applying sealant to the rivet nuts and using a bolt connection structure, the connection reliability is improved, the sealing performance is good, the connection process of high-strength steel is solved, the high mold manufacturing cost is saved, and the specific needs of users are met. Attached Figure Description

[0010] 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.

[0011] Figure 1 A three-dimensional structural diagram of the lower casing of a high-strength steel hot-rolled steel battery provided for an embodiment of this utility model;

[0012] Figure 2 This is an exploded three-dimensional structural diagram of the lower casing of a high-strength steel hot-rolled steel battery provided in an embodiment of the present invention;

[0013] Figure 3 A schematic diagram of the three-dimensional structure of the lower shell welding assembly provided in this embodiment of the utility model;

[0014] Figure 4 This is a three-dimensional structural diagram of the lower housing welding assembly provided in an embodiment of the present utility model;

[0015] Figure 5 This is a schematic diagram of the three-dimensional assembly of the lower shell welding assembly and the module liquid cooling plate provided in the embodiment of this utility model.

[0016] In the picture:

[0017] 1. First frame; 2. Second frame; 3. Third frame; 4. Fourth frame; 5. Rivet nuts; 6. Bottom guard plate; 7. Sealing gasket; 8. Module liquid cooling plate. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] The following is a detailed description of a high-strength steel hot-rolled steel battery lower casing according to an embodiment of the present invention, with reference to the accompanying drawings.

[0022] Example

[0023] Figure 1 This diagram shows a three-dimensional structure of the lower casing of a high-strength steel hot-rolled steel battery provided in an embodiment of the present invention. Figure 2 This diagram shows an exploded three-dimensional structural diagram of the lower casing of a high-strength steel hot-rolled steel battery provided in an embodiment of the present invention; Figure 3This diagram shows a three-dimensional structural diagram of the lower shell welding assembly provided in an embodiment of the present invention; Figure 4 This diagram shows a three-dimensional structural schematic of the lower housing welding assembly provided in an embodiment of the present invention. Figure 5 This diagram illustrates a three-dimensional assembly of the lower housing welding assembly and the module liquid cooling plate according to an embodiment of the present invention. Figures 1 to 5 As shown in the figure, this utility model provides a high-strength steel hot-rolled steel battery lower casing. The lower casing welded assembly is made of high-strength steel and is manufactured by local heating and rolling. It has 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 hot-rolled steel battery lower casing provided in this utility model includes: a lower casing welded assembly and a bottom protective plate 6. The lower casing welded assembly is made of high-strength steel, where the yield strength of the high-strength steel is 960 MPa to 1700 MPa. With a tensile strength of 980 MPa to 1700 MPa, its mechanical properties are significantly superior to traditional ordinary steel, greatly improving the strength, safety, and reliability of the battery casing. The lower casing welding assembly includes two first frames 1, a second frame 2, and a third frame 3. The two first frames 1 are arranged parallel to each other. The second frames 2 and third frames 3 are respectively located at both ends of the first frames 1 and connected to them by welding to form a cuboid shell structure, creating a box-like structure. The shapes of the second frames 2 and third frames 3 can be the same or different, depending on the user's actual needs. The welding method for the first frames 1 and the second and third frames 3 can be laser welding, argon arc welding, etc., including but not limited to the above welding methods. Several rivet nuts 5 are riveted to the first frames 1, second frames 2, and third frames 3 respectively. Sealant is applied to the rivet nuts 5 to improve the sealing of the riveting positions and enhance the sealing protection level. The lower casing welding assembly is mechanically connected to the bottom protective plate 6 and the module liquid cooling plate 8 by bolts. The bolts are located on the rivet nuts 5 and connected to them. For mechanical connection, the rivet nut 5 is provided with threaded holes. Bolts can be connected and fixed to the rivet nut 5 through the threaded holes and tightened. This facilitates the connection of the bottom guard plate 6 and the module liquid cooling plate 8 using bolts. The bottom guard plate 6 is located below the lower housing welding assembly to provide necessary protection for the lower housing welding assembly. The module liquid cooling plate 8 is placed in the lower housing welding assembly to provide cooling and support functions for the power battery. Of course, if the user does not have liquid cooling requirements, the module liquid cooling plate 8 can be omitted. The corresponding lower housing welding assembly only needs to be connected to other corresponding components.

[0024] The high-strength steel hot-rolled steel battery lower casing provided in this embodiment of the utility model includes a sealing gasket 7 as a further design improvement. The sealing gasket 7 is made of an elastic material, such as rubber or polytetrafluoroethylene, including but not limited to the above materials. The sealing gasket 7 is located between the lower casing welded assembly and the bottom protective plate 6 to improve the sealing performance, thereby ensuring the sealing of the connection between the lower casing welded assembly and the bottom protective plate 6.

[0025] In the high-strength steel hot-rolled steel battery lower casing provided in this embodiment of the utility model, as a further design improvement, the lower casing welding assembly also includes a fourth frame 4. One or more fourth frames 4 can be provided. The two ends of the fourth frame 4 are respectively connected to two first frames 1 by welding to enhance the strength and rigidity of the lower casing welding assembly. Several rivet nuts 5 coated with sealant are riveted to the fourth frame 4. The fourth frame 4 is mechanically connected to the bottom protective plate 6 and the module liquid cooling plate 8 by bolts. It is worth noting that by providing several rivet nuts 5, the lower casing welding assembly avoids the limitation that high-strength steel cannot be riveted using the traditional FDS (FDS-Flow Drill Screw) riveting process, thus solving the connection process problem of the high-strength steel hot-rolled steel battery lower casing. The first frame 1, second frame 2, third frame 3, and fourth frame 4 in the lower casing welding assembly are all made of high-strength steel, greatly improving the structural strength of the lower casing welding assembly.

[0026] In the high-strength steel hot-rolled steel battery lower casing provided in this embodiment of the utility model, as a further design improvement, the first frame 1, the second frame 2, the third frame 3, and the fourth frame 4 are all provided with hollow structures to achieve weight reduction. The aforementioned hollow structures can be referred to... Figure 4 The hollow structure shown can be formed by hot rolling, or other methods. This hollow structure ensures the required strength of the load-bearing parts in the lower shell welded assembly while saving materials. The non-load-bearing parts of the first frame 1, the second frame 2, and the third frame 3, namely the sides of the lower shell welded assembly, are made of steel plates, which also improves the weight reduction effect.

[0027] Compared with the prior art, the high-strength steel hot-rolled steel battery lower shell structure of this utility model has a reasonable design. The lower shell welded assembly is made of high-strength steel and manufactured by local heating and rolling, which has high strength, good mechanical properties, and simple rolling cross section, making it particularly suitable for multi-type product trial production. By applying sealant to the rivet nut 5 and using a bolt connection structure, the connection reliability is improved and the sealing performance is good. This solves the connection process problem of high-strength steel, saves high mold manufacturing costs, and meets the specific needs of users.

[0028] The following points need to be explained:

[0029] (1) Unless otherwise defined, the same reference numerals in the embodiments of this utility model and the accompanying drawings have the same meaning.

[0030] (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.

[0031] (3) For clarity, some structures in the drawings used to describe embodiments of the present invention may be enlarged or reduced, i.e., these drawings are not drawn to actual scale.

[0032] (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.

[0033] 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 hot-rolled steel battery lower casing, characterized in that, include: The lower housing welding assembly and the bottom protective plate (6) are made of high-strength steel. The lower housing welding assembly includes two first frames (1), a second frame (2), and a third frame (3). The two first frames (1) are arranged in parallel relative to each other. The second frame (2) and the third frame (3) are respectively arranged at both ends of the first frame (1) and connected to the first frame (1) by welding to form a cuboid shell structure. Several rivet nuts (5) are respectively riveted to the first frame (1), the second frame (2), and the third frame (3). The rivet nuts (5) are coated with sealant. The lower housing welding assembly is mechanically connected to the bottom protective plate (6) and the module liquid cooling plate (8) by bolts. The bolts are arranged on the rivet nuts (5) and are mechanically connected to the rivet nuts (5).

2. The high-strength steel hot-rolled steel battery lower casing according to claim 1, characterized in that, It also includes a sealing gasket (7), which is made of an elastic material and is disposed between the lower housing welded assembly and the bottom protective plate (6) to improve sealing performance.

3. The high-strength steel hot-rolled steel battery lower casing according to claim 2, characterized in that, The lower housing welding assembly also includes a fourth frame (4), the two ends of which are respectively connected to two first frames (1) by welding to strengthen the lower housing welding assembly; a plurality of rivet nuts (5) coated with sealant are riveted to the fourth frame (4), and the fourth frame (4) is mechanically connected to the bottom guard plate (6) and the module liquid cooling plate (8) by bolts.

4. The high-strength steel hot-rolled steel battery lower casing according to claim 3, characterized in that, The first frame (1), the second frame (2), the third frame (3), and the fourth frame (4) are all provided with hollow structures to achieve weight reduction.

5. The high-strength steel hot-rolled steel battery lower casing according to any one of claims 1-4, 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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