Battery device

Abstract

The invention relates to the technical field of battery devices, and discloses a battery device, which comprises a box body, the box body comprises a bottom plate and a surrounding frame surrounding the periphery of the bottom plate, the surrounding frame of the bottom plate defines a cavity, two ends of at least one cross beam structure in a first direction are fixedly connected with a frame of the box body, the box body is divided into at least two accommodating cavities, and the accommodating cavities are used for accommodating battery packs; the cross beam structure comprises at least two cross beams which are sequentially stacked and fixed in the second direction, hoisting holes are formed in the faces, away from the bottom plate, of the cross beams away from the bottom plate in the second direction, and the hoisting holes are used for hoisting the box body; wherein the first direction is parallel to the bottom plate, and the second direction is perpendicular to the bottom plate. According to the battery device provided by the invention, the hoisting hole is only formed in one cross beam on one side, the hoisting hole is used for installing a hoisting point, the number of holes punched in other cross beams can be reduced, the integrity of the other cross beams is ensured, the overall strength of the cross beam structure is ensured, and the structural strength of the battery device is improved.

Description

[0001] This application is a divisional application of the invention patent application with publication number CN202411413621.2. The application date of the original application is: 2024.10.11; the application number is: CN202411413621.2; the name of the invention is: "Battery Device". Technical Field

[0002] The present invention relates to the technical field of battery devices, and in particular to a battery device. Background Art

[0003] Battery devices are widely used in various electrical devices to provide power. The battery device usually includes a box and a plurality of single cells arranged inside the box. At one end of the single cell in the height direction, a conductive bar is usually required to connect the single cells in series or in parallel.

[0004] Generally, in order to improve the structural strength of the battery device, a crossbeam is provided in the box of the battery device to divide the box into different accommodating spaces for accommodating single cells. Generally, in order to reduce the weight of the crossbeam and increase the energy density, a cavity is provided in the crossbeam; however, providing a cavity will reduce the structural strength of the crossbeam. Summary of the invention

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

[0006] The present invention provides a battery device, comprising:

[0007] The box body comprises a bottom plate and a surrounding frame arranged around the bottom plate, wherein the bottom plate and the surrounding frame form a cavity;

[0008] The crossbeam structure has two ends in the first direction fixedly connected to the frame of the box body, and divides the box body into at least two accommodating cavities, and the accommodating cavities are used to accommodate the battery pack; the crossbeam structure includes two crossbeams stacked and fixed in sequence along the second direction, which are the first crossbeam and the second crossbeam, respectively, the second crossbeam has a cavity inside, and a reinforcement member is installed in the cavity;

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

[0010] Beneficial effects: The cavity can reduce the weight of the beam structure and the battery device and improve the energy density; the reinforcement can further reinforce the second beam and improve the overall strength of the beam structure. The cavity and reinforcement can reduce the weight of the beam structure and the battery device and improve the strength of the beam structure and the entire battery device. Specifically, the reinforcement can also be provided with an opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

[0016] Figure 5 A schematic diagram of a beam structure from one viewing angle according to an embodiment of the present invention;

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

[0018] Description of reference numerals:

[0019] 1. Box body; 2. Beam structure; 21. First beam; 22. Second beam; 23. Opening; 24. Reinforcement; 3. Battery pack; 31. Single battery; 4. Conductive bar; 5. Cold plate. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0022] According to an embodiment of the present invention, a battery device is provided, comprising a box body 1 and at least one beam structure 2; the box body 1 comprises a bottom plate and a frame arranged around the bottom plate, the bottom plate and the frame enclose a cavity; both ends of the at least one beam structure 2 in a first direction are fixedly connected to the frame of the box body 1, and divide the box body 1 into at least two accommodating cavities, the accommodating cavities are used to accommodate battery packs 3; the beam structure 2 comprises at least two beams stacked and fixed in sequence along a second direction, and a lifting hole is provided on a side of the beam away from the bottom plate in the second direction, and the lifting hole is used to lift the box body 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 beam structure 2 includes at least two beams stacked and fixed in sequence. A lifting hole is set only on one side of the beam away from the bottom plate. The lifting hole is used to install the lifting point to lift the box 1. The number of holes on the remaining beams can be reduced to ensure the integrity of the remaining beams and the overall strength of the beam 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 a beam on one side is greater than that of the other beams, which can facilitate connection and weight reduction while ensuring the integrity of the beams with a small number of 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 the second direction, namely a first beam 21 and a second beam 22. The first beam 21 is provided with the lifting hole, and the second beam 22 is provided with a cavity inside, and a reinforcement 24 is installed in the cavity.

[0026] The provision of the cavity can reduce the weight of the beam structure 2 and the battery device and improve the energy density; the provision of the reinforcement 24 can further reinforce the second beam 22 and improve the overall strength of the beam structure 2. The provision of the cavity and the reinforcement 24 can both reduce the weight of the beam structure 2 and the battery device and improve the strength of the beam structure 2 and the entire battery device. Specifically, the reinforcement 24 can also be provided with an opening 23.

[0027] In one embodiment, the reinforcement 24 is a plate-like structure, the reinforcement 24 extends along the first direction, and the reinforcement 24 is fixedly connected to the two side cavity walls of the second beam 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 reinforcement member 24 extends along the first direction, and the two sides in the third direction are respectively fixedly connected to the two side walls of the second cross beam 22, so that it can play a supporting role in both the first direction and the third direction, and enhance the strength of the second cross beam 22 in both the first direction and the third direction. The reinforcement member 24 is a plate-like structure, which has a simple structure and occupies a small space, does not increase the overall weight of the second cross beam 22 too much, and can also be easily connected.

[0029] In one embodiment, the reinforcement 24 is a tubular structure, the reinforcement 24 extends along the first direction, and the reinforcement 24 is fixedly connected to the two side cavity walls of the second beam 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 reinforcement member 24 extends along the first direction, and the two sides in the third direction are respectively fixedly connected to the two side walls of the second beam 22, which can play a supporting role in both the first direction and the third direction, and enhance the strength of the second beam 22 in both the first direction and the third direction. The reinforcement member 24 is a tubular structure, and forms a sleeve-like structure with the second beam 22. The fixed connection area between the reinforcement member 24 and the two side walls of the second beam 22 is increased, and the effect of enhancing the strength of the second beam 22 in the first direction and the third direction is better. Since the reinforcement member 24 is a tubular structure, it will not increase the overall weight of the second beam 22 too much, and it is also convenient to connect the reinforcement member 24.

[0031] In a preferred embodiment, the extension length of the reinforcement 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 reinforcement member 24 in the first direction are fixedly connected to the frame of the box body 1.

[0032] In one embodiment, the reinforcement member 24 is fixed to the second cross beam 22 by welding.

[0033] The reinforcement member 24 is welded and fixed to the second cross beam 22 to ensure good connection strength.

[0034] In another embodiment, the reinforcement member 24 is fixedly connected to the second cross beam 22 via fasteners.

[0035] The reinforcement member 24 is fixedly connected to the second cross beam 22 by a fastener, which can facilitate the removal and replacement of the reinforcement member 24. The fastener can be a fastening structure such as a screw, a bolt, and a buckle.

[0036] In one embodiment, a height of the first cross beam 21 in the second direction is smaller than a height of the second cross beam 22 in the second direction.

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

[0038] In one embodiment, a ratio X of the heights of the first beam 21 and the second beam 22 in the second direction is in a 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 be able to withstand the weight of the entire battery device during lifting; therefore, if the ratio of the heights of the first crossbeam 21 and the second crossbeam 22 in the second direction is too small, the structural strength of the first crossbeam 21 will be insufficient, and there may be safety hazards during lifting. In addition, since the first crossbeam 21 also needs to be installed with bolts, a too low height of the first crossbeam 21 will result in too little space for bolt locking; if the ratio of the heights of the first crossbeam 21 and 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 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, ensuring that the heights of the first beam 21 and the second beam 22 are in a relatively reasonable range, which can not only ensure the structural strength of the first beam 21 and avoid safety hazards during lifting, but also ensure that the first beam 21 has a relatively suitable locking space and avoid affecting the wiring layout on the side of the first beam 21 facing away from the second beam 22.

[0040] In a specific embodiment, a 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, a 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 cross beam 21 and the second cross beam 22 are bonded.

[0043] The first cross beam 21 and the second cross beam 22 are bonded to each other, thereby ensuring good connection strength.

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

[0045] The first beam 21 and the second beam 22 can be bonded by structural adhesive, and the structural adhesive has little effect on the structure of the beam structure 2. Therefore, the ratio X of the height of the first beam 21 and the second beam 22 in the second direction is in the range of 0.25 to 0.4, ensuring that the height of the first beam 21 and the second beam 22 is in a more reasonable range, which can not only ensure the structural strength of the first beam 21 and avoid safety hazards during lifting, but also ensure that the first beam 21 has a more suitable locking space, and can also avoid affecting the wiring layout on the side of the first beam 21 facing away from the second beam 22.

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

[0047] The first cross beam 21 and the second cross beam 22 are welded to ensure good connection strength, and are not easily damaged or failed.

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

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

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

[0051] When the first beam 21 and the second beam 22 are welded, the heat generated by welding will cause the first beam 21 and the second beam 22 to deform to a certain extent. At the same time, the adhesive layer can support the first beam 21 and the second beam 22, so that the height of the first beam 21 can be appropriately reduced; therefore, the ratio X of the height of the first beam 21 and the second beam 22 in the second direction is in the range of 0.2 to 0.4, ensuring that the height of the first beam 21 and the second beam 22 is in a more reasonable range, which can not only ensure the structural strength of the first beam 21 and avoid safety hazards during lifting, but also ensure that the first beam 21 has a more suitable locking space, and can also avoid affecting the wiring layout on the side of the first beam 21 facing away from the second beam 22.

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

[0053] The first cross beam 21 and the second cross beam 22 are fixedly connected by fasteners, which can facilitate the disassembly and replacement of the first cross beam 21 and the second cross beam 22. The fasteners can be fastening structures such as screws, bolts and buckles.

[0054] In one embodiment, the first cross beam 21 is welded to the top of the box body 1 , which provides a firm connection and can enhance the overall strength of the box body 1 .

[0055] In one embodiment, the second cross beam 22 is welded to the bottom of the box body 1 , which provides a relatively firm connection and can enhance the overall strength of the box body 1 .

[0056] If the space occupied by the reinforcement member 24 in the cavity of the second cross beam 22 is small, the reinforcement effect of the reinforcement member 24 is poor; if the space occupied by the reinforcement member 24 in the cavity of the second cross beam 22 is large, the weight of the cross beam structure 2 and the entire battery device will be increased, affecting the energy density of the entire battery device. Therefore, the reinforcement member 24 needs to have an appropriate thickness.

[0057] In one embodiment, the crossbeam provided with the hoisting holes is the first crossbeam 21 , and the remaining crossbeams are the second crossbeams 22 . The first crossbeam 21 is made of aluminum, and the second crossbeam 22 is made of aluminum or steel.

[0058] In a specific embodiment, the first cross beam 21 is made of aluminum, and the second cross beam 22 is made of aluminum.

[0059] Specifically, in another embodiment, the first cross beam 21 is made of aluminum, and the second cross beam 22 is made of steel.

[0060] In one embodiment, the battery pack 3 includes at least two single cells 31 arranged in sequence along the first direction, and the poles of the single cells 31 are arranged at one end of the single cells 31 along the third direction; the conductive bar 4 is arranged between the battery pack 3 and the cross beam structure 2, and is arranged opposite to the cross beam structure 2, the length extension direction of the conductive bar 4 and the length extension direction of the cross beam structure 2 are both the first direction, and the poles of two adjacent single cells 31 are connected through the conductive bar 4; the ratio A of the width L1 of the cross beam 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. The extended end surface of the pole of the single cell 31 is arranged perpendicular to the bottom plate; and the third direction is arranged parallel to the bottom plate.

[0061] The crossbeam structure 2 is fixedly connected in the box body 1 to increase the strength of the box body 1 itself, and the length extension direction of the crossbeam structure 2 is the first direction, so that at least two single cells 31 arranged in sequence in the first direction can be supported in the third direction, thereby improving the support strength of the single cells 31 in the third direction, avoiding the collision between the battery pack 3 and the side of the box body 1, avoiding the battery short circuit caused by the weak support strength in the third direction, and avoiding the danger caused by the battery short circuit; in addition, since 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, 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 is controlled, which can avoid insufficient space utilization caused by too large a ratio A, and can avoid insufficient support strength of the single cell 31 in the third direction when the ratio A is too small.

[0062] In a specific embodiment, the conductive bar 4 is spaced apart from the beam structure 2 , and the space is smaller than the thickness of the conductive bar 4 in the third direction.

[0063] Specifically, the third direction is the length direction of the single battery 31, and is also the pole lead-out direction of the single battery 31. 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 a specific embodiment, a ratio A of a width L1 of the beam structure 2 in the third direction to a length L2 of the single battery 31 in the third direction is 0.15.

[0065] In another specific embodiment, a ratio A of a width L1 of the beam structure 2 in the third direction to a length L2 of the single battery 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 20 mm and 55 mm. Specifically, the width L1 can be 20 mm or 55 mm.

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

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

[0069] When 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 too large, the thickness of the beam structure 2 is too thin, the strength of the beam structure 2 itself is low, and the stability is poor; when 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 too small, the thickness of the beam structure 2 is too thick, the internal hollow buffer space of the beam structure 2 is too small, the support strength of the beam structure 2 in the third direction is poor, and sufficient buffer space is not provided. In this embodiment, 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, and the thickness of the beam structure 2 is moderate, which can ensure that the beam structure 2 itself has high strength and good stability; and can also ensure that the internal hollow buffer space of the beam structure 2 is sufficient, and the support strength of the beam structure 2 in the third direction is relatively large.

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

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

[0072] In one embodiment, a ratio C of a height H of the beam structure 2 in the second direction to a 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 perpendicular to each other.

[0073] 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 can determine the supporting strength of the beam structure 2; when the height H of the beam structure 2 in the second direction is larger, the width L1 of the beam structure 2 in the third direction is correspondingly thickened; when the height H of the beam structure 2 in the second direction is smaller, the width L1 of the beam structure 2 in the third direction is correspondingly thinned.

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

[0075] In another specific embodiment, a ratio C of a height H of the beam structure 2 in the second direction to a 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 single cell 31, and is also the pole lead-out direction of the single cell 31. 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 is also the height extension direction of the box body 1.

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

[0078] The height H of the beam structure 2 in the second direction should not be too large. If the height H of the beam structure 2 in the second direction is too large, it will occupy too much space in the box body 1, which is not conducive to improving the space utilization rate in the box body 1. The height H of the beam structure 2 in the second direction should not be too small. If the height H of the beam structure 2 in the second direction is too small, the beam structure 2 cannot play a role in supporting the box body 1.

[0079] In a 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 in sequence along the second direction, wherein the first direction, the third direction and the second direction are perpendicular to each other.

[0082] At least two beams that are separately arranged and sequentially connected along the second direction can further enhance the self-strength and supporting strength of the beam structure 2.

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

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

[0085] The cold plate 5 is disposed between the cooling ends of the two rows of single cells 31 , and can perform heat exchange on the single cells 31 , and also support the single cells 31 in the third direction.

[0086] In a specific embodiment, Figure 5 and Figure 6 As shown, the beam structure 2 includes two beams connected in sequence along the second direction, the two beams are a first beam 21 and a second beam 22, and the thickness L3 of the beam structure 2 includes a first thickness L of the first beam 21 and a second thickness L2 of the first beam 22. 31 and a second thickness L of the second beam 22 32 The height H of the beam structure 2 in the second direction includes a first height H1 of the first beam 21 and a second height H2 of the second beam 22, such as Figure 6 shown.

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

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

Claims

1. A battery device, characterized in that: include: The box body (1) comprises a bottom plate and a surrounding frame arranged around the bottom plate, wherein the bottom plate and the surrounding frame form a cavity; The crossbeam structure (2) has two ends in a first direction fixedly connected to the frame of the box body (1), and divides the box body (1) into at least two accommodating cavities, wherein the accommodating cavities are used to accommodate the battery pack (3); the crossbeam structure (2) comprises two crossbeams stacked and fixed in sequence along a second direction, namely a first crossbeam (21) and a second crossbeam (22); a cavity is provided inside the second crossbeam (22), and a reinforcing member (24) is installed in the cavity; The first direction is a direction parallel to the bottom plate, and the second direction is a direction perpendicular to the bottom plate.

2. The battery device according to claim 1, characterized in that: The reinforcement member (24) is a plate-like structure, the reinforcement member (24) extends along the first direction, and the reinforcement member (24) is fixedly connected to the two side walls of the second cross beam (22) on both sides in the third direction; wherein the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery device according to claim 1, characterized in that: The reinforcement member (24) is a tubular structure, the reinforcement member (24) extends along the first direction, and the reinforcement member (24) is fixedly connected to the two side walls of the second cross beam (22) on both sides in the third direction; wherein 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 reinforcement member (24) is fixed to the second cross beam (22) by welding.

5. The battery device according to claim 2 or 3, characterized in that: The reinforcement member (24) is fixedly connected to the second cross beam (22) via a fastener.

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 smaller than the height of the second crossbeam (22) in the second direction.

7. The battery device according to claim 6, characterized in that: A 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; And / or, the first crossbeam (21) and the second crossbeam (22) are fixedly connected by a fastener; And / or, the first crossbeam (21) and the second crossbeam (22) are welded.

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

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

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