Cross beam structure for battery pack, battery pack and vehicle

Abstract

The application discloses a beam structure for a battery pack, a battery pack with the same and a vehicle. The beam structure comprises a core plate and a beam body. The core plate is arranged to extend along a first direction and comprises a main core part, an upper edge part and a lower edge part. The plate surface of the main core part is arranged perpendicularly to a second direction. The upper edge part and the lower edge part are distributed at the upper and lower ends of the main core part along a third direction and extend backward along the second direction, respectively. The first direction, the second direction and the third direction are perpendicular to each other. The beam body is wrapped around the core plate. The beam body and the core plate are made of different metal materials, and the material strength of the core plate is greater than that of the beam body. By wrapping the beam body made of low material strength around the core plate made of high material strength, the beam structure meeting the requirements of structural strength and impact resistance can be made by using less material, so that the lightweight design requirement is met. Meanwhile, the overall structure is relatively simple and occupies less space, so that the installation freedom of the beam structure and other structures of the battery pack and the vehicle body can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery housing structure technology, specifically to a beam structure for a battery pack, a battery pack, and a vehicle. Background Technology

[0002] As the carrier and protection device for batteries, the battery pack not only needs to house all the battery cells and management system, but also needs to meet various requirements related to battery safety performance, such as vibration, compression, drop, water immersion, and fire. Therefore, the structural advantages of the battery pack directly affect the safety and lifespan of the battery. With the continuous increase in battery energy density, the volume and weight of battery packs are also constantly increasing. As the size of the battery pack increases, the overall strength, rigidity, and other performance requirements of the battery pack also increase. Balancing the weight, size, and strength performance requirements of the battery pack has become a major challenge in battery pack design and manufacturing.

[0003] Currently, electric vehicle battery packs generally use steel or aluminum structural boxes. Steel structural boxes are formed by sheet metal stamping, resulting in a relatively heavy weight and low corrosion resistance. Aluminum structural boxes are relatively lightweight, but have higher overall costs and weaker impact resistance. Furthermore, because vehicles travel in a forward-backward direction, the crossbeam structure of the battery pack is often susceptible to collisions or impacts when the vehicle moves forward or backward. To balance the performance requirements of the crossbeam structure, the common practice is to reinforce the structural design and material usage of the crossbeam. While this improves the battery pack's impact resistance and safety performance, the added reinforcement structures and materials increase the size and weight of the battery pack, affecting the overall vehicle lightweighting; moreover, it increases the structural complexity of the crossbeam, reducing installation flexibility. Utility Model Content

[0004] In view of the above problems, the present application provides a crossbeam structure for a battery pack, a battery pack and a vehicle, which can effectively improve the structural strength of the crossbeam structure while ensuring that the crossbeam is relatively small in size and relatively simple in structure.

[0005] According to one aspect of the embodiments of this application, a beam structure for a battery pack is provided, comprising: a core plate extending along a first direction, including a main core portion, an upper edge portion, and a lower edge portion, the surface of the main core portion being perpendicular to a second direction, the upper edge portion and the lower edge portion being distributed at the upper and lower ends of the main core portion along a third direction and extending rearward along the second direction respectively; the first direction, the second direction, and the third direction are perpendicular to each other; a beam body covering the core plate; wherein the beam body and the core plate are made of different metal materials, and the material strength of the core plate is greater than the material strength of the beam body.

[0006] In one exemplary embodiment of this application, the beam includes a main beam, an upper beam, and a lower beam. The plate surface of the main beam is arranged perpendicular to the second direction. The upper beam and the lower beam are distributed at the upper and lower ends of the main beam along the third direction and extend rearward along the second direction, respectively. The main beam covers the main core, the upper beam covers the upper edge, and the lower beam covers the lower edge.

[0007] In one exemplary embodiment of this application, a plurality of first weight-reducing holes are provided on the upper edge, and the plurality of first weight-reducing holes are spaced apart on the surface of the upper edge along a first direction; and / or a plurality of second weight-reducing holes are provided on the lower edge, and the plurality of second weight-reducing holes are spaced apart on the surface of the lower edge along a first direction.

[0008] In one exemplary embodiment of this application, the main core portion is provided with a plurality of third weight-reducing holes, which are spaced apart on the surface of the main core portion along a first direction; wherein, at least one third weight-reducing hole is configured as a mounting interface, which penetrates the surface of the main beam portion and the main core portion along a second direction.

[0009] In one exemplary embodiment of this application, the beam further includes a reinforcing rib section, which connects the upper beam section and the lower beam section and is forwardly connected to the main beam section along a second direction; the reinforcing rib section includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, the plurality of first reinforcing ribs extending along a third direction and spaced apart along a first direction, the upper end of the first reinforcing ribs being connected to the upper beam section and the lower end being connected to the lower beam section; the plurality of second reinforcing ribs extending along the first direction and spaced apart along a third direction, and intersecting and connecting with the second reinforcing ribs.

[0010] In one exemplary embodiment of this application, the crossbeam structure further includes a support, the front end of which is provided with a mounting structure for external connection to the vehicle body, the rear end of which is connected to the beam body, and the support extends circumferentially along the plate surface of the main beam to form a plurality of third reinforcing ribs, the orthographic projection of the third reinforcing ribs in the second direction coincides with the plate surface of the main core.

[0011] In one exemplary embodiment of this application, the upper beam portion's orthographic projection in a third direction coincides with the lower beam portion; the lower edge portion's extension length in a second direction is less than that of the upper edge portion, so that a connection area suitable for external welding is formed between the end of the lower edge portion away from the main core portion and the end of the lower beam portion away from the main beam portion.

[0012] In one exemplary embodiment of this application, the beam body has end plates integrally formed with the beam body at both ends in a first direction. The surface of the end plates is perpendicular to the first direction, and the end plates cover the upper beam part upward and the lower beam part downward in a second direction; and cover the main beam part forward in a third direction, and cover the end of the upper beam part away from the main beam part and the end of the lower beam part away from the main beam part in a third direction.

[0013] According to a second aspect of the present application, a battery pack is provided, including an upper cover, a bottom plate, a front crossbeam, a rear crossbeam, and two side beams. The two ends of the front crossbeam are respectively fitted onto the two ends of the rear crossbeam through the side beams, forming a receiving cavity. The upper cover is disposed above the receiving cavity, and the four sides of the upper cover are fixedly connected to the front crossbeam, the rear crossbeam, and the two side beams respectively. The bottom plate is attached to the bottom of the receiving cavity, and the four sides of the bottom plate are fixedly connected to the front crossbeam, the rear crossbeam, and the two side beams respectively. Among them, at least one of the front crossbeam and the rear crossbeam is the aforementioned crossbeam structure.

[0014] According to a third aspect of the embodiments of this application, a vehicle is provided, including the battery pack described above.

[0015] The beam structure of this application uses a low-strength beam body to cover a high-strength core plate, which can produce a beam structure that meets the requirements of structural strength and impact resistance with less material, thus achieving the requirements of lightweight design. At the same time, the safety performance of the battery pack can be guaranteed without adding additional reinforcement structures to the outside of the beam body. The structure is relatively simple and occupies less space, which can effectively improve the installation freedom of the beam structure and other battery pack structures, as well as the battery pack and the vehicle body.

[0016] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the beam structure described in the embodiment of this application is shown;

[0019] Figure 2 A cross-sectional view of the beam structure described in an embodiment of this application is shown;

[0020] Figure 3 A schematic diagram of the core board structure described in an embodiment of this application is shown;

[0021] Figure 4 A schematic diagram of the beam structure described in the embodiment of this application is shown. Figure 1 ;

[0022] Figure 5 A schematic diagram of the beam structure described in the embodiment of this application is shown. Figure 2 ;

[0023] Figure 6 A schematic diagram of the connection between the support and the beam as described in an embodiment of this application is shown;

[0024] Figure 7 This illustration shows a schematic diagram of the connection between the beam structure, the top cover, and the bottom plate according to an embodiment of this application.

[0025] Figure 8 A schematic diagram showing the connection between the crossbeam structure and the side beam described in an embodiment of this application is shown;

[0026] Figure 9 A schematic diagram of the structure of the battery pack described in an embodiment of this application is shown.

[0027] Explanation of icon numbers:

[0028] 1-Core board, 11-Main core, 111-Third weight-reduction hole, 112-Mounting interface, 1121-Electrical interface structure, 1122-Explosion-proof valve interface structure, 1123-Thermal management liquid pipeline interface structure, 1124-Column, 12-Upper edge, 121-First weight-reduction hole, 13-Lower edge, 131-Second weight-reduction hole

[0029] 2-Beam body, 21-Main beam section, 22-Upper beam section, 23-Lower beam section, 231-Connection area, 24-Reinforcing rib section, 241-First reinforcing rib, 242-Second reinforcing rib, 2421-Support, 25-End plate, 251-Rounded corner,

[0030] 3-Support, 31-Load-bearing structure, 32-Third reinforcing rib,

[0031] 100 - Crossbeam structure, 200 - Top cover, 201 - Sealant, 202 - FDS screw, 300 - Base plate, 400 - Side beam, 500 - Front crossbeam.

[0032] x - first direction, y - second direction, z - third direction.

[0033] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0035] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0036] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0037] It should also be noted that in the description of this application, the first direction, the second direction, and the third direction are three mutually perpendicular directions in a three-dimensional coordinate system, while the terms "front," "back," "left," "right," "up," and "down," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. In the accompanying drawings, the x-direction is the first direction, where the direction pointed by the arrow is "left," and vice versa; the y-direction is the second direction, where the direction pointed by the arrow is "front," and vice versa; the z-direction is the third direction, where the direction pointed by the arrow is "up," and vice versa. The terms "inner" and "outer" mentioned in the embodiments of this application are defined based on the outline of the corresponding component. It is understood that the above-mentioned terms indicating orientation or positional relationship are only for the convenience of describing this application and 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 on the application.

[0038] like Figure 1 and Figure 2As shown, this embodiment provides a beam structure for a battery pack, including a core plate 1 and a beam 2. The core plate 1 extends along a first direction x and includes a main core 11, an upper edge 12, and a lower edge 13. The surface of the main core 11 is perpendicular to the second direction y. The upper edge 12 and the lower edge 13 are distributed at the upper and lower ends of the main core 11 along a third direction z and extend backward along the second direction y, respectively. The first direction x, the second direction y, and the third direction z are perpendicular to each other. The beam 2 also extends along the first direction x and covers the core plate 1. Meanwhile, the beam 2 and the core plate 1 are made of different metal materials, and the material strength of the core plate 1 is greater than that of the beam 2. In this way, by using a low-strength beam 2 to cover a high-strength core plate 1, a beam structure that meets the requirements of structural strength and impact resistance can be made with less material, thus achieving the requirements of lightweight design. At the same time, the safety performance of the battery pack can be guaranteed without adding additional reinforcement structures to the outside of the beam 2. The structure is relatively simple and occupies less space, which can effectively improve the installation freedom of the beam structure and other structures of the battery pack, as well as the installation freedom of the battery pack and the vehicle body.

[0039] For example, in this embodiment, the core plate 1 is made of high-strength steel plate, while the beam 2 is made of aluminum alloy, and the beam 2 can be encased in the core plate 1 by die casting. Specifically, after the core plate 1 is placed and fixed in the die casting mold, molten aluminum alloy is injected into the die casting mold for die casting, so that the molten aluminum alloy fully fills and encapsulates the core material. After the die casting solidifies, the beam structure with the beam 2 encasing the core plate 1 is obtained. At this time, the beam 2 is a one-piece molded part. At the same time, the core plate 1 can improve the transverse structural strength and impact resistance of the beam 2 by using the main core part 11, and improve the structural strength and connection strength of the upper and lower sides of the beam 2 by using the upper edge part 12 and the lower edge part 13, respectively, so that it can meet the harsh working conditions such as collision, impact and extrusion, and achieve weight reduction to a certain extent.

[0040] It is understood that in other embodiments, the core plate 1 and the beam 2 can also be made of other metal materials, as long as the material strength of the core plate 1 is greater than that of the beam 2. Furthermore, the beam 2 can also enclose the core plate 1 by designing the beam 2 as a separate component sandwiched between the two sides of the core plate 1, and then using welding composite forming (such as explosive welding, friction welding, etc.), cold rolling cladding, or CMT (cold metal transfer welding) connection processes to achieve the configuration where the core plate 1 is enclosed inside the beam 2. Specific connection methods are existing technologies and will not be elaborated here.

[0041] In some embodiments, such as Figure 2As shown, the beam 2 includes a main beam section 21, an upper beam section 22, and a lower beam section 23. The surface of the main beam section 21 is perpendicular to the second direction y. The upper beam section 22 and the lower beam section 23 are distributed at the upper and lower ends of the main beam section 21 along the third direction z, and extend backward along the second direction y respectively. The main beam section 21 covers the main core section 11, the upper beam section 22 covers the upper edge section 12, and the lower beam section 23 covers the lower edge section 13. In this way, the shape of the beam 2 can be further defined, so that the overall stress structure of the beam 2 is the same as or consistent with the overall stress structure of the core plate 1, thereby allowing the load / force on the beam 2 to be transferred and distributed between the core plate 1 and the beam 2 through an effective and continuous transmission path.

[0042] In some embodiments, such as Figure 2 and Figure 3 As shown, the upper edge 12 has a plurality of first weight-reducing holes 121, which are spaced apart along the first direction x on the surface of the upper edge 12; and / or the lower edge 13 has a plurality of second weight-reducing holes 131, which are spaced apart along the first direction x on the surface of the lower edge 13. In this way, the weight of the core plate 1 can be further reduced, ensuring the lightweight of the beam structure.

[0043] It is understood that the first weight-reducing hole 121 and / or the second weight-reducing hole 131 can be blind holes arranged along the third direction z, or through holes arranged through the third direction z, preferably through holes. In this way, the beam parts constituting the upper beam part 22 on the upper and lower sides of the upper edge 12 can be connected together through the first weight-reducing hole 121, and the beam parts constituting the lower beam part 23 on the upper and lower sides of the lower edge 13 can be connected together through the second weight-reducing hole 131, thereby further improving the connection stability between the core plate 1 and the beam 2. At the same time, when the beam 2 is covered by the core plate 1 by die casting, the through design of the first weight-reducing hole 121 and / or the second weight-reducing hole 131 can act as flow channels, allowing molten aluminum alloy liquid to pass through, thereby guiding the flow of molten liquid during the die casting process, improving the filling uniformity of the thicker parts and the far end parts, effectively reducing the generation of defects such as porosity and shrinkage cavities, and ensuring the structural strength and rigidity performance of the beam 2.

[0044] In some embodiments, such as Figure 4 and Figure 5As shown, the main core 11 has a plurality of third weight-reduction holes 111, which are distributed at intervals along the first direction x on the surface of the main core 11. This further reduces the weight of the core plate 1 and ensures the lightweight of the beam structure 100. At least one of the third weight-reduction holes 111 is configured as an installation interface 112, which penetrates the surface of the main beam 21 and the main core 11 along the second direction y, and is configured as a corresponding interface structure according to specific functions. For example, the electrical interface structure 1121 provided on the left side of the main beam 21 can meet the installation of the charging terminal; the explosion-proof valve interface structure 1122 provided in the middle of the main beam 21 can meet the installation of the explosion-proof valve; and the thermal management liquid pipeline interface structure 1123 provided on the right side of the main beam 21 can meet the installation and sealing of the coolant pipeline joint. In this way, by setting the installation interface 112, the corresponding functional devices can be installed. The number and structure of the installation interface 112 can be selected and set according to the specific functional requirements. There are no restrictions here, and it will not be elaborated further.

[0045] It is understandable that the third weight-reducing hole 111 can be a blind hole arranged along the second direction y, or a through hole arranged through the second direction y, preferably a through hole. In this way, the beam parts constituting the main beam part 21 on the front and rear sides of the main core part 11 can be connected together through the third weight-reducing hole 111, thereby further improving the connection stability between the core plate 1 and the beam 2. At the same time, when the beam 2 is covered by the core plate 1 by die casting, the through design of the third weight-reducing hole 111 can also serve as a flow channel, which is the same as the function of the first weight-reducing hole 121 or the second weight-reducing hole 131 mentioned above, and will not be described again here.

[0046] In some embodiments, such as Figure 2 and Figure 4As shown, the beam 2 also includes a reinforcing rib section 24, which connects the upper beam section 22 and the lower beam section 23, and is connected to the main beam section 21 along the second direction y. The reinforcing rib section 24 includes a plurality of first reinforcing ribs 241 and a plurality of second reinforcing ribs 242. The plurality of first reinforcing ribs 241 extend along the third direction z and are spaced apart along the first direction x. The upper end of the first reinforcing ribs 241 is connected to the upper beam section 22, and the lower end of the first reinforcing ribs 241 is connected to the lower beam section 23. In this way, the first reinforcing ribs 241 can provide support between the upper beam section 22 and the lower beam section 23, thereby achieving... The upper beam 22 and lower beam 23 transmit forces in the third direction z, improving the load-bearing capacity of the beam structure 100 in the third direction z. On the other hand, the upper beam 22 and lower beam 23 can be connected to the main beam 21 at the rear end in the second direction y, improving the structural strength of the main beam 21 in the second direction y. At the same time, a number of second reinforcing ribs 242 extend along the first direction x and are spaced apart along the third direction z, and are intersected and connected with the second reinforcing ribs 242. The second reinforcing ribs 242 can connect multiple first reinforcing ribs 241 into one unit, thereby improving the structural strength of the reinforcing rib part 24.

[0047] It is understood that the interface structure corresponding to the aforementioned installation interface 112 can be designed on the rear side of the main beam 21 to accommodate the installation of threaded fasteners. The column extends rearward along the second direction y and provides a threaded installation point after being machined and tapped. At the same time, the column can be set against the reinforcing rib 24 to improve its bending and shear resistance, and can transmit torque with the reinforcing rib 24 to ensure the structural strength and connection stability of the column.

[0048] Optionally, such as Figure 3 As shown, the second reinforcing rib 242, which is set downwards towards the third side, can be integrated with a bracket 2421 to fix the battery cable copper busbar and liquid cooling plate and other functional components inside the battery pack.

[0049] In some embodiments, such as Figure 5 and Figure 6 As shown, the crossbeam structure 100 also includes a support 3. The front end of the support 3 is provided with a mounting structure 31 for external connection to the vehicle body. The rear end of the support 3 is connected to the beam body 2. The rear end of the support 3 extends circumferentially along the plate surface of the main beam 21 to form a plurality of third reinforcing ribs 32. The orthographic projection of the third reinforcing ribs 32 in the second direction y coincides with the plate surface of the main core 11. In this way, the force of the support 3 can be transferred to the core plate 1, further improving the connection stability between the support 3 and the beam body 2, and the force-bearing effect is better.

[0050] It is understood that the aforementioned mounting structure 31 may have mounting holes provided at the front end of the support 3, and a corresponding steel press-fit bushing sleeve may be installed to serve as a mounting point for connecting the battery pack to the vehicle body. This is a common connection structure in related technologies and will not be elaborated here.

[0051] In some embodiments, such as Figure 7 As shown, the upper beam portion 22 of the beam body 2 coincides with the lower beam portion 23 in the third direction z, that is, the upper beam portion 22 and the lower beam portion 23 of the beam body 2 are of equal length in the second direction y, or the extension length of the upper beam portion 22 in the second direction y is less than that of the lower beam portion 23; while the extension length of the lower edge portion 13 of the core plate 1 in the second direction y is less than that of the upper edge portion 12. In this way, a connection area 231 suitable for external welding can be formed between the end of the lower edge portion 13 away from the main core portion 11 and the end of the lower beam portion 23 away from the main beam portion 21. This connection area 231 can provide sufficient operating space when connecting the bottom plate 300 of the battery pack to the outside. In particular, when the connection is made by welding (such as the FSW friction stir welding process), the bonding strength between the lower beam portion 23 and the bottom plate 300 can be higher.

[0052] In some embodiments, such as Figure 4 and Figure 8 As shown, the beam 2 has end plates 25 integrally formed with the beam 2 at both ends in the first direction x. The surface of the end plates 25 is perpendicular to the first direction x, and the end plates 25 cover the upper beam 22 upward and the lower beam 23 downward in the second direction y; and in the third direction z, they cover the main beam 21 forward and the end of the upper beam 22 away from the main beam 21 and the end of the lower beam 23 away from the main beam 21, respectively. By setting the end plates 25, on the one hand, the ends of the beam 2 can be closed at both ends in the first direction x, improving the structural strength of the beam 2 ends. On the other hand, it can provide an operating surface for external connection at the ends of the beam 2. This operating surface can provide sufficient operating space when connecting the side beam 400 of the battery pack, especially when the connection is made by welding (such as CMT cold metal transfer welding process), which can make the joint strength between the beam 2 and the side beam 400 higher.

[0053] Optional, such as Figure 8 As shown, the circumferential edge of the end plate 25 can be rounded to form a rounded corner 251. This can make the end corners of the beam 2 transition continuously and smoothly. On the other hand, when the beam 2 is matched with the side beam 400, the rounded corner 251 of the end plate 25 and the inner surface of the side beam 400 can form a groove. This provides sufficient welding space to facilitate welding when using welding methods, especially CMT connection technology, and makes the joint strength higher.

[0054] In another embodiment, such as Figure 9 As shown, a battery pack is also provided, including a top cover 200, a bottom plate 300, a front crossbeam 500, a rear crossbeam (not shown), and two side beams 400. The two ends of the front crossbeam 500 are respectively fitted onto the two ends of the rear crossbeam through the side beams 400, forming a receiving cavity. The top cover 200 is disposed above the receiving cavity, and the four sides of the top cover 200 are respectively fixedly connected to the front crossbeam 500, the rear crossbeam, and the two side beams 400. The bottom plate 300 is attached to the bottom of the receiving cavity, and the four sides of the bottom plate 300 are respectively fixedly connected to the front crossbeam 500, the rear crossbeam, and the two side beams 400. At least one of the front crossbeam 500 and the rear crossbeam is the crossbeam structure 100 in any of the above embodiments. It is understood that, for the other structures and working principles of the beam structure 100 in the above-mentioned battery pack, please refer to the above description of the embodiment of the beam structure 100. Since the beam structure 100 has the above-mentioned technical effects, the battery pack with the beam structure 100 should also have the corresponding technical effects, which will not be repeated here.

[0055] Specifically, in this embodiment, the top cover 200 of the battery pack can be made of steel plate stamping, aluminum alloy plate stamping, or SMC composite material molded plate, depending on the configuration. The bottom plate 300 of the battery pack can be made of wide aluminum alloy profile welded plate, and the side beam 400 can be made of aluminum profile. The front crossbeam 500 and rear crossbeam of the battery pack are both crossbeam structures 100 as described in the above embodiment. Taking the connection at the front crossbeam 500 of the battery pack as an example, such as... Figure 9As shown, the two ends of the front crossbeam 500, i.e., the crossbeam structure 100, are respectively attached to the opposite inner sides of the two side beams 400, and are welded and fixed to the side beams 400 by CMT (cold metal transfer welding) connection process when end plates 25 are provided; the upper beam part 22 of the front crossbeam 500, i.e., the crossbeam structure 100, is attached to the lower end face of the upper cover 200 by sealant 201, and is connected and fixed to the upper cover 200 by FDS (hot melt self-tapping screw) connection process. At this time, FDS screws 202 are respectively inserted through the upper cover 200, the upper beam part 22 and the upper edge part 12, so that the connection is tight and stable; the lower beam part 23 of the crossbeam structure 100 is attached to the upper end face of the base plate 300, and is fixed by CMT (cold metal transfer welding) connection process when end plates 25 are provided. The FSW (Friction Stir Welding) connection process is used to weld and fix the bottom plate 300. The welding area is located in the connection area 231 of the lower beam 23. Since the beam 2 and the bottom plate 300 are made of the same material, the mechanical friction and plastic flow of the FSW connection process achieve the bonding of the beam 2 and the bottom plate 300, resulting in a continuous weld and better connection quality. The connection method between the side beam 400 and the top cover 200 can refer to the connection method between the front crossbeam 500 and the top cover 200, that is, it is connected using the FDS (Friction Stir Welding) connection process. The connection method between the side beam 400 and the bottom plate 300 can also refer to the connection method between the front crossbeam 500 and the bottom plate 300, that is, it is connected using the FSW connection process. By selecting materials and connecting in the above manner, the mechanical and safety performance of the battery pack can be effectively improved, meeting the strength and rigidity requirements. It can also reduce the weight of the battery pack, thereby increasing the number of cells and improving the overall energy density of the pack.

[0056] It is understood that the connection at the rear crossbeam of the battery pack is the same as the connection at the front crossbeam 500 mentioned above, and will not be repeated here. In other embodiments, when the battery pack is larger, a central crossbeam is also provided in the middle region of the battery pack to improve structural strength and provide a mounting point for connection with the vehicle body. In this case, the central crossbeam can be made of aluminum profile, and its connection with the upper cover 200, the bottom plate 300, and the two side beams 400 can refer to the prior art, and will not be repeated here.

[0057] In another embodiment, a vehicle is provided, including the battery pack described in the above embodiments. For other structures and working principles of the battery pack, please refer to the above description of the embodiments of the battery pack. Since the battery pack has the above-mentioned technical effects, the vehicle with the battery pack should also have the corresponding technical effects, which will not be repeated here.

[0058] It is understood that, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., in this application should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified. The terms "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application.

[0060] The illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples, without contradiction.

[0061] Although embodiments of this application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can modify, substitute, and vary the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A beam structure for a battery pack, characterized in that, include: A core board extending along a first direction includes a main core, an upper edge, and a lower edge. The surface of the main core is perpendicular to a second direction. The upper edge and lower edge are distributed at the upper and lower ends of the main core along a third direction and extend rearward along the second direction, respectively. The first direction, the second direction, and the third direction are perpendicular to each other. A beam body covering a core plate; wherein the beam body and the core plate are made of different metal materials, and the material strength of the core plate is greater than that of the beam body.

2. The beam structure according to claim 1, characterized in that, The beam body includes a main beam, an upper beam, and a lower beam. The main beam is arranged perpendicular to the second direction. The upper beam and the lower beam are distributed at the upper and lower ends of the main beam along the third direction and extend backward along the second direction, respectively. The main beam covers the main core, the upper beam covers the upper edge, and the lower beam covers the lower edge.

3. The beam structure according to claim 2, characterized in that, The upper edge is provided with a plurality of first weight-reducing holes, which are spaced apart on the surface of the upper edge along the first direction; and / or the lower edge is provided with a plurality of second weight-reducing holes, which are spaced apart on the surface of the lower edge along the first direction.

4. The beam structure according to claim 2, characterized in that, The main core is provided with a plurality of third weight-reducing holes, which are spaced apart on the surface of the main core along the first direction; wherein, at least one of the third weight-reducing holes is configured as an installation interface, which penetrates the surface of the main beam and the main core along the second direction.

5. The beam structure according to claim 2, characterized in that, The beam body also includes a reinforcing rib section, which connects the upper beam section and the lower beam section, and is connected forward along the second direction to the main beam section; the reinforcing rib section includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, the plurality of first reinforcing ribs extending along the third direction and spaced apart along the first direction, the upper end of the first reinforcing ribs being connected to the upper beam section and the lower end being connected to the lower beam section; the plurality of second reinforcing ribs extending along the first direction and spaced apart along the third direction, and intersecting and connecting with the second reinforcing ribs.

6. The beam structure according to claim 2, characterized in that, The crossbeam structure also includes a support, the front end of which is provided with a mounting structure for external connection to the vehicle body, the rear end of which is connected to the beam body, and the support extends circumferentially along the plate surface of the main beam to form a plurality of third reinforcing ribs, the orthographic projection of the third reinforcing ribs in the second direction coincides with the plate surface of the main core.

7. The beam structure according to any one of claims 2-6, characterized in that, The upper beam portion's orthographic projection in the third direction coincides with the lower beam portion; the lower edge portion's extension length in the second direction is less than that of the upper edge portion, so that a connection area suitable for external welding is formed between the end of the lower edge portion away from the main core portion and the end of the lower beam portion away from the main beam portion.

8. The beam structure according to claim 7, characterized in that, The beam has end plates integrally formed with the beam at both ends in the first direction. The surface of the end plate is perpendicular to the first direction. The end plate covers the upper beam portion upward and the lower beam portion downward in the second direction. In the third direction, it covers the main beam portion forward and the upper beam portion and the lower beam portion backward, respectively covering the end of the upper beam portion away from the main beam portion and the end of the lower beam portion away from the main beam portion.

9. A battery pack, characterized in that, The device includes a top cover, a bottom plate, a front crossbeam, a rear crossbeam, and two side beams. The two ends of the front crossbeam are respectively connected to the two ends of the rear crossbeam via the side beams, forming a receiving cavity. The top cover is disposed above the receiving cavity, and the four sides of the top cover are fixedly connected to the front crossbeam, the rear crossbeam, and the two side beams, respectively. The bottom plate is attached to the bottom of the receiving cavity, and the four sides of the bottom plate are fixedly connected to the front crossbeam, the rear crossbeam, and the two side beams, respectively. At least one of the front crossbeam and the rear crossbeam is a crossbeam structure as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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