Integrated high-strength steel rolling battery pack shell

Abstract

The embodiment of the invention provides an integrated high-strength steel rolling battery pack shell, and relates to the field of batteries. The integrated high-strength steel rolling battery pack shell comprises a bottom protection plate, B-shaped beams are welded to the long edges of the two sides of the bottom protection plate, square-shaped beams are welded to the short edges of the two sides of the bottom protection plate, and the two B-shaped beams and the two square-shaped beams are welded to the bottom protection plate. The first steel plate and the second steel plate are rolled and welded at the same time, the left and right B-shaped beams are manufactured, the left and right B-shaped beams are put on the second rolling line again, the front and rear square-shaped beams are formed, the B-shaped beams and the square-shaped beams are welded to the bottom protection plate after the tool is clamped, the integrated battery pack shell is obtained, and the integrated battery pack shell is manufactured through the rolling and welding process. A plurality of independent parts are integrated into an integral frame, so that the production process is simplified, the number of the parts is reduced, the whole device has few parts, the structure is simple, the cost is reduced, and compared with a traditional battery pack shell, welding seams are reduced, the airtight reliability is high, and the integration completeness is high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an integrated high-strength steel roll-pressed battery pack casing. Background Art

[0002] With the rapid development of new energy vehicles, the performance and reliability of battery packs, as the core components of electric vehicles, directly affect the safety and endurance of the entire vehicle.

[0003] According to the Chinese patent announcement number: CN219892285U, a battery pack shell and a battery pack are disclosed. The battery pack shell includes a frame, and the frame includes an annular frame; a bottom guard plate, which is arranged at one axial end of the annular frame and connected to the annular frame; a support plate, which is arranged between the bottom guard plate and the frame, and the outer contour of the support plate is the same as the outer contour of the annular frame; an inner shell, which is arranged in the annular frame and connected to the annular frame, and the side of the inner shell away from the bottom guard plate is open; a heat insulation layer, which is arranged on the side wall of the inner shell. According to the battery pack shell of the application, a multi-layer composite structure is formed, which not only makes the battery pack shell have good thermal insulation effect, but also makes the battery pack shell have high structural strength, low cost, high safety, and small space occupation.

[0004] Traditional battery pack frames are usually made of bent parts and stamped parts through welding processes. Although this manufacturing method meets the basic structural requirements to a certain extent, it has the following problems:

[0005] The traditional battery pack frame is composed of multiple independent parts, which need to be processed separately and then assembled and welded, making the production process complicated and time-consuming. Since it involves the assembly and welding of multiple parts, errors may be introduced in each link, resulting in poor consistency in the size and performance of the final product.

[0006] Secondly, the connection between multiple parts requires a large number of welding points, which increases the number of welds. This not only increases the time and cost of the welding process, but may also lead to weld quality problems, such as pores and cracks. A large number of welds makes it difficult to ensure the airtightness of the battery pack, which is prone to leakage problems, affecting the safety and service life of the battery.

[0007] Furthermore, the rigidity and strength of traditional welded structures are affected by the quality of the welds, and they may be deformed or damaged, especially when subjected to torsional forces;

[0008] The structural design of multi-part combinations is more complicated, which increases the difficulty of design and manufacturing, and also increases the cost of maintenance and repair. Summary of the invention

[0009] The present application aims to at least solve the technical problems existing in the prior art that the traditional battery pack shell is made by welding processes of bending parts and stamping parts, with numerous parts, poor consistency, a large number of welds, poor airtight reliability, poor torsional rigidity, complex structure, and high parts cost. To this end, the present application proposes an integrated high-strength steel rolled battery pack shell.

[0010] According to the embodiment of the present application, the integrated high-strength steel rolled battery pack shell includes a bottom guard plate, which is used to provide structural support and protection. The long sides of the bottom guard plate are welded with S-shaped beams, and the short sides of the bottom guard plate are welded with O-shaped beams. By welding two groups of S-shaped beams and two groups of O-shaped beams to the bottom guard plate, an integrated battery pack shell closed on all sides is formed. The S-shaped beams are formed by rolling steel plates one and two into a curved shape by rolling equipment and then welding them, and the welding is carried out by laser welding.

[0011] According to some embodiments of the present application, in order to ensure the dimensional consistency and accuracy of the "H" beam, the rolled left and right "H" beams are cut to a fixed length so that the length of the "H" beam is consistent with the length of the bottom guard plate.

[0012] According to some embodiments of the present application, the U-shaped beam is made by rolling and welding steel plate three and steel plate four by a second rolling line, and the U-shaped beam is cut to a fixed length by punching and sawing processes, and the U-shaped beam and the R-shaped beam have hollow structures inside.

[0013] According to some embodiments of the present application, during welding, a jig is used to fix the spherical beam and the square beam to the surface of the bottom guard plate to form an integrated battery pack shell that is closed on all sides.

[0014] According to some embodiments of the present application, the surfaces of the bottom guard plate, the spherical beam and the square beam are coated with an insulating layer, and the upper side of the insulating layer is coated with a wear-resistant layer.

[0015] According to some embodiments of the present application, the material of the insulating layer is a silicone material, and the material of the wear-resistant layer is a ceramic coating.

[0016] According to some embodiments of the present application, internal reinforcement sleeves are welded at both ends of the inner part of the U-shaped beam, which help to evenly distribute the external load and reduce local stress concentration. The outer sides of the U-shaped beam and the R-shaped beam are hooped with steel sleeves, and several steel sleeves are respectively provided and distributed at equal intervals. The steel sleeves can evenly distribute the external load and reduce local stress concentration.

[0017] According to some embodiments of the present application, the wall thickness of the steel sleeve is between 2 mm and 5 mm, which can control the overall weight and avoid excessive weight affecting the overall performance and cruising range of the vehicle.

[0018] According to some embodiments of the present application, a through groove is opened inside the steel sleeve, and a plurality of reinforcing plates are arranged inside the through groove to prevent the through groove from being deformed due to impact and vibration.

[0019] According to some embodiments of the present application, an opening is provided at the bottom of the steel sleeve, and a plurality of grooves are provided on the side wall of the steel sleeve. The grooves remove part of the material of the steel sleeve to reduce the overall weight of the steel sleeve.

[0020] The beneficial effects of the present application are as follows: the steel plates one and two are rolled and welded at the same time to form left and right shaped beams; the rolled left and right shaped beams are cut to fixed lengths through punching and sawing processes; the front and rear shaped beams are formed by being put on the second rolling line again; then the shaped beams and the shaped beams are welded to the bottom guard plate after being clamped by the welding workstation; finally, an integrated battery pack shell is obtained; multiple independent parts are integrated into an overall frame through rolling and welding processes, which simplifies the production process and reduces the number of parts; the entire device has fewer parts, a simple structure, and lower costs; compared with traditional battery pack shells, the welds are reduced, the airtight reliability is strong, the integration integrity is high, the box structure strength is high, the entire frame structure is more complete, and the overall stiffness and torsional stiffness are improved; secondly, the rolling process is highly efficient, suitable for mass production, and improves production capacity.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of the overall three-dimensional structure of an integrated high-strength steel roll-pressed battery pack housing according to an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of the overall structure disassembly according to an embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of the disassembly of the Japanese-shaped beam structure according to an embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of the structure of the square beam according to an embodiment of the present application;

[0027] Figure 5is a schematic diagram of the steel sleeve structure installation state according to an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of the structure of a steel sleeve, etc. according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of the installation of the internal reinforcement sleeve structure according to an embodiment of the present application;

[0030] Figure 8 is a schematic diagram of a steel sleeve structure according to an embodiment of the present application;

[0031] Fig. 9 It is a schematic plan view of a steel sleeve structure according to an embodiment of the present application.

[0032] Figure numerals: 1. bottom guard plate; 2. S-shaped beam; 3. U-shaped beam; 4. steel plate one; 5. steel plate two; 6. steel plate three; 7. steel plate four; 8. steel sleeve; 9. internal reinforcement sleeve; 10. through groove; 11. reinforcement plate; 12. groove. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0034] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] The following describes an integrated high-strength steel roll-pressed battery pack casing according to an embodiment of the present application with reference to the accompanying drawings.

[0042] Embodiment 1

[0043] like Figure 1-Figure 4It is shown that the one-piece high-strength steel rolled battery pack shell according to the embodiment of the present application includes a bottom guard plate 1. The bottom guard plate 1 is an important component for the battery pack shell, which is intended to provide structural support and protection. The long sides of the bottom guard plate 1 are welded with a Japanese-shaped beam 2, and the short sides of the bottom guard plate 1 are welded with a mouth-shaped beam 3. By welding two groups of Japanese-shaped beams 2 and two groups of mouth-shaped beams 3 to the bottom guard plate 1, an one-piece battery pack shell closed on all sides is formed. Compared with the traditional battery pack shell, the one-piece structure not only simplifies the manufacturing process and reduces the number of welds, but also improves the air tightness and waterproof performance of the entire battery pack shell. At the same time, the one-piece design also enhances the overall stiffness and torsional stiffness of the battery pack, and improves its stability and reliability under various working conditions.

[0044] First, steel plate 1 4 and steel plate 2 5 are simultaneously fed into a rolling device, which gradually bends the two steel plates into a desired shape through a series of forming rollers. After the rolling is completed, steel plate 1 4 and steel plate 2 5 are welded together to form left and right sun-shaped beams 2. Welding can be carried out using high-efficiency welding technologies such as laser welding or resistance welding to ensure the quality and strength of the weld.

[0045] In order to ensure the size consistency and accuracy of the Japanese-shaped beam 2, the rolled Japanese-shaped beam 2 is cut to a fixed length using a punching process and a sawing process. The punching process is mainly used to remove excess material, while the sawing process is used to accurately cut to the required length. The combination of these two processes can ensure that the size of each Japanese-shaped beam 2 is completely consistent, improving the consistency and stability of the overall frame.

[0046] The steel plates 3 6 and 4 7 are then fed into a second rolling line, and are made into front and rear shaped beams 3 through similar rolling and welding processes. The shaped beams 3 are also cut to length through punching and sawing processes to ensure dimensional consistency and accuracy.

[0047] At the welding workstation, use a fixture to fix the sun-shaped beam 2 and the mouth-shaped beam 3 to the bottom guard plate 1, and use automated welding equipment to weld the sun-shaped beam 2 and the mouth-shaped beam 3 to the corresponding positions of the bottom guard plate 1. After the welding is completed, an integrated battery pack shell (such as Figure 1 This design reduces the number of welds and improves air tightness and structural integrity.

[0048] In addition, an insulating layer, such as a silicone coating, is coated on the surface of the bottom guard plate 1, the S-shaped beam 2 and the U-shaped beam 3 to prevent electrical short circuits and improve the safety of the battery pack. A wear-resistant layer, such as a ceramic coating, is coated on the upper side of the insulating layer to improve the wear resistance of the beam, especially during frequent loading and unloading and transportation.

[0049] Embodiment 2

[0050] like Figures 5 to 9As shown, when the battery pack shell is installed in the vehicle, it is subjected to various complex loads during the driving of the vehicle. Since the interior of the U-shaped beam 3 and the Japanese-shaped beam 2 are hollow structures, in order to improve the stability of the overall frame of the battery pack shell, the U-shaped beam 3 is first locally reinforced, and the internal reinforcement sleeves 9 are located at both ends of the U-shaped beam 3. These parts are usually stress concentration areas. By adding reinforcement sleeves at these key positions, the bearing capacity of these areas can be significantly improved. The reinforcement sleeve helps to evenly distribute the external load and reduce local stress concentration, thereby extending the service life of the U-shaped beam 3. At the same time, the internal reinforcement sleeve 9 increases the cross-sectional moment of inertia of the U-shaped beam 3 and improves its ability to resist torsion. When subjected to torsional force, the reinforcement sleeve can effectively prevent the U-shaped beam 3 from twisting or deformation, thereby ensuring the overall stability and safety of the battery pack.

[0051] Secondly, the steel sleeve 8 is wrapped around the outside of the U-shaped beam 3 and the R-shaped beam 2, increasing the cross-sectional area of ​​these beams, thereby improving their stiffness and bending resistance. The steel sleeve 8 can evenly distribute the external load, reduce local stress concentration, and improve the stability of the overall structure. When impacted, the steel sleeve 8 can effectively prevent the U-shaped beam 3 and the R-shaped beam 2 from bending or deformation, thereby maintaining the geometric shape and integrity of the battery pack.

[0052] Several steel sleeves 8 are arranged at equal intervals. This design can evenly enhance the stiffness and impact resistance of the entire beam. The wall thickness of the steel sleeve 8 is between 2mm and 5mm, which can effectively control the overall weight and avoid excessive weight affecting the overall performance and cruising range of the vehicle.

[0053] Furthermore, a through groove 10 is opened inside the steel sleeve 8, and a plurality of reinforcing plates 11 are arranged inside the through groove 10. The reinforcing plates 11 also enhance the structural integrity of the steel sleeve 8 to prevent deformation caused by external impact or vibration.

[0054] An opening is provided at the bottom of the steel sleeve 8, so that the steel sleeve 8 does not contact the bottom guard plate 1, and will not affect the welding of the S-beam 2 and the O-beam 3, and it is also convenient for the assembly of the steel sleeve 8 with the O-beam 3 and the S-beam 2, simplifying the installation process. A plurality of grooves 12 are provided on the side wall of the steel sleeve 8. The grooves 12 remove part of the material, thereby reducing the overall weight of the steel sleeve 8 and improving the vehicle's cruising range and overall performance.

[0055] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0056] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. One-piece high-strength steel roll-pressed battery pack housing, characterized in that: The invention comprises a bottom guard plate (1), wherein the bottom guard plate (1) is used to provide structural support and protection, wherein the long sides of the bottom guard plate (1) are both welded with a spherical beam (2), and the short sides of the bottom guard plate (1) are both welded with a square beam (3), and by welding two groups of spherical beams (2) and two groups of square beams (3) to the bottom guard plate (1), an integrated battery pack shell with four sides closed is formed, wherein the spherical beam (2) is formed by rolling a first steel plate (4) and a second steel plate (5) into a curved shape by a rolling device and then welding them, and the welding is performed by laser welding.

2. The integrated high-strength steel roll-pressed battery pack shell according to claim 1, characterized in that: In order to ensure the dimensional consistency and accuracy of the Japanese-shaped beam (2), the Japanese-shaped beams (2) on the left and right sides that have been rolled are cut to a fixed length so that the length of the Japanese-shaped beam (2) is consistent with the length of the bottom guard plate (1).

3. The integrated high-strength steel roll-pressed battery pack shell according to claim 2 is characterized in that: The square beam (3) is manufactured by rolling and welding the third steel plate (6) and the fourth steel plate (7) by a second rolling line. The square beam (3) is cut to a fixed length by punching and sawing processes. The square beam (3) and the sun beam (2) are hollow structures inside.

4. The integrated high-strength steel roll-pressed battery pack shell according to claim 3 is characterized in that: During welding, a fixture is used to fix the sun-shaped beam (2) and the mouth-shaped beam (3) to the surface of the bottom guard plate (1) to form an integrated battery pack shell.

5. The integrated high-strength steel roll-pressed battery pack shell according to claim 4, characterized in that: The surfaces of the bottom guard plate (1), the spherical beam (2) and the square beam (3) are coated with an insulating layer, and the upper side of the insulating layer is coated with a wear-resistant layer.

6. The integrated high-strength steel roll-pressed battery pack shell according to claim 5, characterized in that: The material of the insulating layer is silicone material, and the material of the wear-resistant layer is ceramic coating.

7. The integrated high-strength steel roll-pressed battery pack shell according to claim 6, characterized in that: Internal reinforcement sleeves (9) are welded at both ends of the inner part of the U-shaped beam (3), and the internal reinforcement sleeves (9) help to evenly distribute the external load and reduce local stress concentration. The outer sides of the U-shaped beam (3) and the R-shaped beam (2) are hooped with steel sleeves (8), and a plurality of steel sleeves (8) are respectively provided and distributed at equal intervals. The steel sleeves (8) can evenly distribute the external load and reduce local stress concentration.

8. The integrated high-strength steel roll-pressed battery pack shell according to claim 7, characterized in that: The wall thickness of the steel sleeve (8) is between 2 mm and 5 mm, which can control the overall weight and avoid excessive weight affecting the overall performance and cruising range of the vehicle.

9. The integrated high-strength steel roll-pressed battery pack shell according to claim 8, characterized in that: A through slot (10) is provided inside the steel sleeve (8), and a plurality of reinforcing plates (11) are provided inside the through slot (10) to prevent the through slot (10) from being deformed due to impact and vibration.

10. The integrated high-strength steel roll-pressed battery pack shell according to claim 9, characterized in that: The bottom of the steel sleeve (8) is provided with an opening, and the side wall of the steel sleeve (8) is provided with a plurality of grooves (12). The grooves (12) remove part of the material of the steel sleeve (8) to reduce the overall weight of the steel sleeve (8).

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