Battery device

Abstract

This invention relates to the field of battery device technology and discloses a battery device including a housing comprising a base plate and a frame surrounding the base plate, the base plate and frame forming a cavity. At least one crossbeam structure is fixedly connected to the frame of the housing at both ends in a first direction, dividing the housing into at least two receiving cavities for accommodating a battery pack. The crossbeam structure includes at least two crossbeams stacked and fixed in sequence along a second direction. A lifting hole is provided on the side of the crossbeam away from the base plate in the second direction, for lifting the housing. The first direction is parallel to the base plate, and the second direction is perpendicular to the base plate. The battery device provided by this invention provides a lifting hole only on one crossbeam located on one side, for installing a lifting point. This reduces the number of holes on the remaining crossbeams, ensuring the integrity of the remaining crossbeams and the overall strength of the crossbeam structure, thereby improving the structural strength of the battery device.

Description

[0001] This application is a divisional application of the invention patent application with publication number CN202411413621.2. The original application was filed on October 11, 2024; the application number is CN202411413621.2; and the invention title is "Battery Device". Technical Field

[0002] This invention relates to the field of battery device technology, and more specifically to battery devices. Background Technology

[0003] Battery devices are widely used in various electrical devices to provide power. A battery device typically consists of a housing and multiple individual cells housed inside the housing. At one end of the individual cells along their height, a busbar is usually required to connect the individual cells in series or parallel.

[0004] Typically, to improve the structural strength of a battery pack, crossbeams are installed inside the packing housing to divide the housing into different spaces for accommodating individual battery cells. Generally, to reduce the weight of the crossbeams and increase energy density, cavities are incorporated within them; however, these cavities reduce the structural strength of the crossbeams. Summary of the Invention

[0005] In view of this, the present invention provides a battery device to solve the problem that setting a cavity in the crossbeam reduces the structural strength of the crossbeam.

[0006] This invention provides a battery device, comprising:

[0007] The enclosure includes a base plate and a frame surrounding the base plate, the base plate and the frame forming a cavity;

[0008] The beam structure has two ends fixedly connected to the frame of the housing in the first direction, and divides the housing into at least two accommodating cavities for accommodating the battery pack; the beam structure includes two beams stacked and fixed in sequence along the second direction, namely a first beam and a second beam, the second beam having a cavity inside, and a reinforcing member installed in the cavity;

[0009] Wherein, the first direction is a direction parallel to the base plate, and the second direction is a direction perpendicular to the base plate.

[0010] Beneficial effects: The cavity design reduces the weight of the crossbeam structure and battery pack, increasing energy density; the reinforcement further strengthens the second crossbeam, improving the overall strength of the crossbeam structure. The cavity and reinforcement design both reduce the weight of the crossbeam structure and battery pack, and increase their overall strength. Specifically, the reinforcement may also have openings. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a partially enlarged schematic diagram of a partial structure of a battery device according to an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of a battery device (hidden at the top of the housing) according to an embodiment of the present invention;

[0014] Figure 3 This is a partially enlarged schematic diagram of another partial structure of a battery device according to an embodiment of the present invention;

[0015] Figure 4 This is a partially enlarged schematic diagram of another partial structure of a battery device according to an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of a beam structure according to an embodiment of the present invention;

[0017] Figure 6 This is a schematic diagram of another perspective of a beam structure according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Housing; 2. Crossbeam structure; 21. First crossbeam; 22. Second crossbeam; 23. Opening; 24. Reinforcing member; 3. Battery pack; 31. Individual cell; 4. Conductive busbar; 5. Cold plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0022] According to an embodiment of the present invention, a battery device is provided, including a housing 1 and at least one crossbeam structure 2; the housing 1 includes a bottom plate and a frame surrounding the bottom plate, the bottom plate and the frame forming a cavity; at least one crossbeam structure 2 is fixedly connected to the frame of the housing 1 at both ends in a first direction, and divides the housing 1 into at least two receiving cavities, the receiving cavities being used to accommodate a battery pack 3; the crossbeam structure 2 includes at least two crossbeams stacked and fixed in sequence along a second direction, and a lifting hole is provided on the side of the crossbeam away from the bottom plate in the second direction, the lifting hole being used to lift the housing 1; wherein, the first direction is a direction parallel to the bottom plate, and the second direction is a direction perpendicular to the bottom plate.

[0023] The crossbeam structure 2 includes at least two crossbeams that are stacked and fixed in sequence. Only one crossbeam away from the bottom plate has a lifting hole on the side away from the bottom plate. The lifting hole is used to install lifting points for lifting the housing 1. The number of holes on the other crossbeams can be reduced to ensure the integrity of the other crossbeams and the overall strength of the crossbeam structure 2, thereby improving the structural strength of the battery device.

[0024] Specifically, each beam of the beam structure 2 is provided with openings 23 for weight reduction and connection. The number of openings 23 for weight reduction and connection on one beam is greater than that on the other beams. This facilitates connection and weight reduction, while ensuring the integrity of the beam with fewer openings 23, thereby enhancing the overall strength and support strength of the beam structure 2.

[0025] In one embodiment, the beam structure 2 includes two beams stacked and fixed in sequence along a second direction, namely a first beam 21 and a second beam 22. The first beam 21 is provided with the hoisting hole, and the second beam 22 has a cavity inside, in which a reinforcing member 24 is installed.

[0026] The cavity reduces the weight of the crossbeam structure 2 and the battery pack, increasing energy density; the reinforcing member 24 further strengthens the second crossbeam 22, improving the overall strength of the crossbeam structure 2. The cavity and reinforcing member 24 both reduce the weight of the crossbeam structure 2 and the battery pack, while simultaneously increasing their strength. Specifically, the reinforcing member 24 may also have openings 23.

[0027] In one embodiment, the reinforcing member 24 is a plate-shaped structure, the reinforcing member 24 extends along the first direction, and the reinforcing member 24 is fixedly connected to the two side cavity walls of the second crossbeam 22 on both sides in the third direction; wherein, the first direction, the second direction and the third direction are perpendicular to each other.

[0028] The reinforcing member 24 extends along the first direction, and its two sides in the third direction are fixedly connected to the two side cavity walls of the second crossbeam 22, respectively. It can provide support in both the first and third directions, and enhance the strength of the second crossbeam 22 in both directions. Moreover, the reinforcing member 24 has a plate-like structure, which is simple in structure, occupies little space, does not increase the overall weight of the second crossbeam 22 excessively, and is also easy to connect.

[0029] In one embodiment, the reinforcing member 24 is a tubular structure, the reinforcing member 24 extends along the first direction, and the reinforcing member 24 is fixedly connected to the two side walls of the second crossbeam 22 on both sides in the third direction; wherein, the first direction, the second direction and the third direction are perpendicular to each other.

[0030] The reinforcing member 24 extends along the first direction, and its two sides in the third direction are fixedly connected to the two side cavity walls of the second crossbeam 22, respectively. It can provide support in both the first and third directions, and enhance the strength of the second crossbeam 22 in both directions. Furthermore, the reinforcing member 24 is a tubular structure, forming a nested tubular structure with the second crossbeam 22. This increases the fixed connection area between the reinforcing member 24 and the two side cavity walls of the second crossbeam 22, resulting in better strength enhancement of the second crossbeam 22 in both the first and third directions. Since the reinforcing member 24 is a tubular structure, it does not excessively increase the overall weight of the second crossbeam 22, and it also facilitates the connection of the reinforcing member 24.

[0031] In a preferred embodiment, the extension length of the reinforcing member 24 in the first direction is consistent with the extension length of the second crossbeam 22 in the first direction, and both ends of the reinforcing member 24 in the first direction are fixedly connected to the frame of the box body 1.

[0032] In one embodiment, the reinforcing member 24 is welded and fixed to the second crossbeam 22.

[0033] The reinforcing member 24 is welded and fixed to the second crossbeam 22, which can ensure good connection strength.

[0034] In another embodiment, the reinforcing member 24 is fixedly connected to the second crossbeam 22 by fasteners.

[0035] The reinforcing member 24 is fixedly connected to the second crossbeam 22 by fasteners, which facilitates the disassembly and replacement of the reinforcing member 24. The fasteners can be screws, bolts, clips, or other fastening structures.

[0036] In one embodiment, the height of the first crossbeam 21 in the second direction is less than the height of the second crossbeam 22 in the second direction.

[0037] In a specific embodiment, the height of the first crossbeam 21 in the second direction does not exceed 7mm.

[0038] In one embodiment, the ratio X of the heights of the first beam 21 and the second beam 22 in the second direction is in the range of 0.25 to 0.4.

[0039] The second crossbeam 22 mainly serves to enhance the structural strength of the battery device, while the first crossbeam 21 needs to withstand the weight of the entire battery device during hoisting. Therefore, if the height ratio of the first crossbeam 21 to the second crossbeam 22 in the second direction is too small, the structural strength of the first crossbeam 21 will be insufficient, which may pose a safety hazard during hoisting. Furthermore, since bolts need to be installed on the first crossbeam 21, a low height of the first crossbeam 21 will result in insufficient space for bolt fastening. If the height ratio of the first crossbeam 21 to the second crossbeam 22 in the second direction is too large, the height of the first crossbeam 21 will be too high, which will affect the wiring arrangement on the side of the first crossbeam 21 facing away from the second crossbeam 22. In this embodiment, the ratio X of the height of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.25 to 0.4, ensuring that the height of the first crossbeam 21 and the second crossbeam 22 is within a reasonable range. This ensures the structural strength of the first crossbeam 21, avoids safety hazards during lifting, provides a suitable locking space for the first crossbeam 21, and avoids affecting the wiring arrangement on the side of the first crossbeam 21 facing away from the second crossbeam 22.

[0040] In one specific embodiment, the ratio X of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is 0.25.

[0041] In another specific embodiment, the ratio X of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is 0.4.

[0042] In one embodiment, the first crossbeam 21 and the second crossbeam 22 are bonded together.

[0043] The first crossbeam 21 and the second crossbeam 22 are bonded together, which can ensure good connection strength.

[0044] In one embodiment, when the first crossbeam 21 and the second crossbeam 22 are bonded together, the ratio X of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.25 to 0.4.

[0045] The first crossbeam 21 and the second crossbeam 22 can be bonded together with structural adhesive. The structural adhesive has little impact on the structure of the crossbeam structure 2. Therefore, the ratio X of the height of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.25 to 0.4, which ensures that the height of the first crossbeam 21 and the second crossbeam 22 is within a reasonable range. This can ensure the structural strength of the first crossbeam 21, avoid safety hazards during lifting, ensure that the first crossbeam 21 has a suitable locking space, and avoid affecting the wiring arrangement on the side of the first crossbeam 21 facing away from the second crossbeam 22.

[0046] In one embodiment, the first crossbeam 21 and the second crossbeam 22 are welded together.

[0047] The welding of the first crossbeam 21 and the second crossbeam 22 ensures good connection strength, making it less prone to damage and preventing failure.

[0048] In one embodiment, when the first crossbeam 21 and the second crossbeam 22 are welded, the ratio X of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.3 to 0.4.

[0049] When the first crossbeam 21 and the second crossbeam 22 are welded, the heat generated during welding will cause certain deformation of the first crossbeam 21 and the second crossbeam 22. In order to ensure the strength of the first crossbeam, the height of the first crossbeam needs to be appropriately increased. Therefore, the ratio X of the height of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.3 to 0.4. This ensures that the height of the first crossbeam 21 and the second crossbeam 22 is within a reasonable range, which can not only ensure the structural strength of the first crossbeam 21 and avoid safety hazards during lifting, but also ensure that the first crossbeam 21 has a suitable locking space, and also avoid affecting the wiring arrangement on the side of the first crossbeam 21 facing away from the second crossbeam 22.

[0050] In one embodiment, when the first crossbeam 21 and the second crossbeam 22 are bonded and welded, the ratio X of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.2 to 0.4.

[0051] When the first crossbeam 21 and the second crossbeam 22 are welded, the heat generated during welding will cause certain deformation of the first crossbeam 21 and the second crossbeam 22. At the same time, the adhesive layer can provide support for the first crossbeam 21 and the second crossbeam 22, so that the height of the first crossbeam 21 can be appropriately reduced. Therefore, the ratio X of the height of the first crossbeam 21 and the second crossbeam 22 in the second direction is in the range of 0.2 to 0.4, which ensures that the height of the first crossbeam 21 and the second crossbeam 22 is within a reasonable range. This can ensure the structural strength of the first crossbeam 21, avoid safety hazards during lifting, ensure that the first crossbeam 21 has a suitable locking space, and avoid affecting the wiring arrangement on the side of the first crossbeam 21 facing away from the second crossbeam 22.

[0052] In one embodiment, the first beam 21 and the second beam 22 are fixedly connected by fasteners.

[0053] The first crossbeam 21 and the second crossbeam 22 are fixedly connected by fasteners, which facilitates the disassembly and replacement of the first crossbeam 21 and the second crossbeam 22. The fasteners can be screws, bolts, clips, or other fastening structures.

[0054] In one embodiment, the first crossbeam 21 is welded to the top of the box 1, which provides a more secure connection and enhances the overall strength of the box 1.

[0055] In one embodiment, the second crossbeam 22 is welded to the bottom of the box 1, which provides a more secure connection and enhances the overall strength of the box 1.

[0056] If the reinforcing member 24 occupies a small space within the cavity of the second crossbeam 22, its reinforcing effect will be poor; if the reinforcing member 24 occupies a large space within the cavity of the second crossbeam 22, it will increase the weight of the crossbeam structure 2 and the entire battery device, affecting the energy density of the entire battery device. Therefore, the reinforcing member 24 needs to have an appropriate thickness.

[0057] In one embodiment, the beam with the lifting hole is a first beam 21, and the remaining beams are second beams 22. The first beam 21 is made of aluminum, and the second beam 22 is made of aluminum or steel.

[0058] In one specific embodiment, the first crossbeam 21 is made of aluminum, and the second crossbeam 22 is made of aluminum.

[0059] In another specific embodiment, the first crossbeam 21 is made of aluminum and the second crossbeam 22 is made of steel.

[0060] In one embodiment, the battery pack 3 includes at least two individual cells 31 arranged sequentially along a first direction. The terminals of the individual cells 31 are disposed at one end along a third direction. A conductive bus 4 is disposed between the battery pack 3 and the crossbeam structure 2, and is disposed opposite to the crossbeam structure 2. The length extension direction of the conductive bus 4 and the length extension direction of the crossbeam structure 2 are both the first direction. The terminals of two adjacent individual cells 31 are connected through the conductive bus 4. The ratio A of the width L1 of the crossbeam structure 2 in the third direction to the length L2 of the individual cell 31 in the third direction satisfies 0.15 ≤ A ≤ 0.4. The protruding end face of the terminal of the individual cell 31 is perpendicular to the base plate; the third direction is parallel to the base plate.

[0061] The crossbeam structure 2 is fixedly connected inside the housing 1, increasing the strength of the housing 1 itself. The length extension direction of the crossbeam structure 2 is the first direction, which can support at least two individual batteries 31 arranged sequentially in the first direction in a third direction. This improves the support strength for the individual batteries 31 in the third direction, preventing collisions between the battery pack 3 and the side of the housing 1, avoiding battery short circuits caused by weak support strength in the third direction, and preventing the dangers caused by battery short circuits. Furthermore, since the ratio A of the width L1 of the crossbeam structure 2 in the third direction to the length L2 of the individual battery 31 in the third direction satisfies 0.15≤A≤0.4, controlling the ratio A of the width L1 of the crossbeam structure 2 in the third direction to the length L2 of the individual battery 31 in the third direction can avoid both insufficient space utilization due to an excessively large ratio A and insufficient support strength for the individual batteries 31 in the third direction due to an excessively small ratio A.

[0062] In a specific implementation, the conductive busbar 4 is spaced apart from the crossbeam structure 2, and the interval is less than the thickness of the conductive busbar 4 in the third direction.

[0063] Specifically, the third direction is the length direction of the single cell 31, and also the direction in which the terminal leads of the single cell 31 are led out. The first direction is the length extension direction of the beam structure 2, and the third direction is the width extension direction of the beam structure 2.

[0064] In one specific embodiment, the ratio A of the width L1 of the beam structure 2 in the third direction to the length L2 of the single cell 31 in the third direction is 0.15.

[0065] In another specific embodiment, the ratio A of the width L1 of the beam structure 2 in the third direction to the length L2 of the single cell 31 in the third direction is 0.4.

[0066] In one embodiment, the width L1 of the beam structure 2 in the third direction is between 20mm and 55mm. Specifically, the width L1 can be either 20mm or 55mm.

[0067] In one embodiment, the length L2 of the single battery cell 31 in the third direction is between 100mm and 150mm. Specifically, the length L2 can be 100mm or 150mm.

[0068] In one embodiment, the beam structure 2 is a hollow tubular structure, and the ratio B of the width L1 of the beam structure 2 in the third direction to the thickness L3 of the beam structure 2 satisfies 10≤B≤41.6.

[0069] When the ratio B of the width L1 and thickness L3 of the beam structure 2 in the third direction is too large, the beam structure 2 is too thin, resulting in low strength and poor stability. Conversely, when the ratio B is too small, the beam structure 2 is too thick, leading to insufficient internal hollow buffer space and poor support strength in the third direction. In this embodiment, the ratio B of the width L1 and thickness L3 of the beam structure 2 in the third direction satisfies 10 ≤ B ≤ 41.6. The thickness of the beam structure 2 is moderate, ensuring both high strength and good stability while providing sufficient internal hollow buffer space and high support strength in the third direction.

[0070] In one specific embodiment, the beam structure 2 is a hollow tubular structure, and the ratio B of the width L1 of the beam structure 2 in the third direction to the thickness L3 of the beam structure 2 is 10.

[0071] In another specific embodiment, the beam structure 2 is a hollow tubular structure, and the ratio B of the width L1 of the beam structure 2 in the third direction to the thickness L3 of the beam structure 2 is 41.6.

[0072] In one embodiment, the ratio C of the height H of the beam structure 2 in the second direction to the width L1 of the beam structure 2 in the third direction satisfies 0.86≤C≤3.8; wherein the first direction, the third direction, and the second direction are all perpendicular to each other.

[0073] The ratio C of the height H of the crossbeam structure 2 in the second direction to the width L1 of the crossbeam structure 2 in the third direction determines the supporting strength of the crossbeam structure 2. When the height H of the crossbeam structure 2 in the second direction is large, the width L1 of the crossbeam structure 2 in the third direction is correspondingly thickened; when the height H of the crossbeam structure 2 in the second direction is small, the width L1 of the crossbeam structure 2 in the third direction is correspondingly thinned.

[0074] In one specific embodiment, the ratio C of the height H of the beam structure 2 in the second direction to the width L1 of the beam structure 2 in the third direction is 0.86.

[0075] In another specific embodiment, the ratio C of the height H of the beam structure 2 in the second direction to the width L1 of the beam structure 2 in the third direction is 3.8.

[0076] Specifically, the third direction is the length direction of the individual battery 31, and also the direction in which the terminal leads of the individual battery 31 are led out. The first direction is the length extension direction of the crossbeam structure 2, and the third direction is the width extension direction of the crossbeam structure 2. The second direction is the height extension direction of the crossbeam structure 2, and the second direction is also the height extension direction of the housing 1.

[0077] In one embodiment, the height H of the beam structure 2 in the second direction satisfies 43mm≤H≤76.5mm; wherein the first direction, the third direction, and the second direction are mutually perpendicular.

[0078] The height H of the crossbeam structure 2 in the second direction should not be too large. If the height H of the crossbeam structure 2 in the second direction is too large, it will occupy too much space inside the box 1, which is not conducive to improving the space utilization rate inside the box 1. The height H of the crossbeam structure 2 in the second direction should not be too small. If the height H of the crossbeam structure 2 in the second direction is too small, the crossbeam structure 2 will not be able to support the box 1.

[0079] In one specific embodiment, the height H of the beam structure 2 in the second direction is 43 mm.

[0080] In another specific embodiment, the height H of the beam structure 2 in the second direction is 76.5 mm.

[0081] In one embodiment, the beam structure 2 includes at least two beams connected sequentially along a second direction, wherein the first direction, the third direction, and the second direction are mutually perpendicular.

[0082] The separate arrangement of at least two crossbeams connected sequentially along the second direction can further enhance the strength of the crossbeam structure 2 itself and its supporting strength.

[0083] Specifically, each beam is a hollow tubular structure.

[0084] In one embodiment, the battery pack 3 includes two columns arranged sequentially along the third direction, each column including at least two individual cells 31 arranged sequentially along the first direction; the end of the individual cell 31 away from the terminal post in the third direction is a cooling end, and the cooling ends of the two columns of individual cells 31 are arranged opposite to each other; the battery device also includes a cold plate 5, which is connected between the cooling ends of the two columns of individual cells 31.

[0085] The cold plate 5 is set between the cooling ends of the two rows of individual cells 31, which can both exchange heat between the individual cells 31 and provide support for the individual cells 31 in the third direction.

[0086] In one specific embodiment, such as Figure 5 and Figure 6 As shown, the beam structure 2 includes two beams connected sequentially along the second direction, namely a first beam 21 and a second beam 22. The thickness L3 of the beam structure 2 includes the first thickness L of the first beam 21. 31 The second thickness L of the second crossbeam 22 32 The height H of the beam structure 2 in the second direction includes the first height H1 of the first beam 21 and the second height H2 of the second beam 22, as shown below. Figure 6 As shown.

[0087] The height H of the beam structure 2 in the second direction satisfies H = H1 + H2.

[0088] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery device, characterized in that, include: The box body (1) includes a bottom plate and a surrounding frame around the bottom plate, the bottom plate and the surrounding frame forming a cavity; The beam structure (2) is fixedly connected to the frame of the housing (1) at both ends in the first direction, and divides the housing (1) into at least two accommodating cavities for accommodating the battery pack (3); the beam structure (2) includes two beams stacked and fixed in sequence along the second direction, namely a first beam (21) and a second beam (22), the second beam (22) has a cavity inside, and a reinforcing member (24) is installed in the cavity; the battery pack (3) includes at least two single cells (31) arranged in sequence along the first direction, and the terminals of the single cells (31) are arranged along the third direction. The direction is set at one end of the single cell (31); the conductive bus (4) is set between the battery pack (3) and the crossbeam structure (2) and is set opposite to the crossbeam structure (2). The length extension direction of the conductive bus (4) and the length extension direction of the crossbeam structure (2) are both the first direction. The poles of two adjacent single cells (31) are connected through the conductive bus (4); the ratio A of the width L1 of the crossbeam structure (2) in the third direction to the length L2 of the single cell (31) in the third direction satisfies 0.15≤A≤0.4; Wherein, the first direction is a direction parallel to the base plate, and the second direction is a direction perpendicular to the base plate; the first direction, the second direction, and the third direction are all perpendicular to each other.

2. The battery device according to claim 1, characterized in that, The reinforcing member (24) is a plate-shaped structure. The reinforcing member (24) extends along the first direction, and the reinforcing member (24) is fixedly connected to the two side cavity walls of the second crossbeam (22) on both sides in the third direction.

3. The battery device according to claim 1, characterized in that, The reinforcing member (24) is a tubular structure. The reinforcing member (24) extends along the first direction and is fixedly connected to the two side walls of the second crossbeam (22) on both sides of the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

4. The battery device according to claim 2 or 3, characterized in that, The reinforcing member (24) is welded and fixed to the second crossbeam (22).

5. The battery device according to claim 2 or 3, characterized in that, The reinforcing member (24) is fixedly connected to the second crossbeam (22) by fasteners.

6. The battery device according to claim 2 or 3, characterized in that, The height of the first crossbeam (21) in the second direction is less than the height of the second crossbeam (22) in the second direction.

7. The battery device according to claim 6, characterized in that, The ratio X of the heights of the first crossbeam (21) and the second crossbeam (22) in the second direction is in the range of 0.25 to 0.

4.

8. The battery device according to claim 2 or 3, characterized in that, The first crossbeam (21) and the second crossbeam (22) are bonded together; And / or, the first crossbeam (21) and the second crossbeam (22) are fixedly connected by fasteners; And / or, the first crossbeam (21) and the second crossbeam (22) are welded together.

9. The battery device according to claim 8, characterized in that, When the first crossbeam (21) and the second crossbeam (22) are bonded together, the ratio X of the height of the first crossbeam (21) and the second crossbeam (22) in the second direction is in the range of 0.25 to 0.4; And / or, when the first crossbeam (21) and the second crossbeam (22) are welded, the ratio X of the height of the first crossbeam (21) and the second crossbeam (22) in the second direction is in the range of 0.3 to 0.4; And / or, when the first crossbeam (21) and the second crossbeam (22) are bonded and welded, the ratio X of the height of the first crossbeam (21) and the second crossbeam (22) in the second direction is in the range of 0.2 to 0.

4.

10. The battery device according to any one of claims 1 to 3, characterized in that, The first crossbeam (21) is made of aluminum, and the second crossbeam (22) is made of aluminum or steel.

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