Battery device

Abstract

The present invention relates to the technical field of battery devices, and discloses a battery device, including a box; at least one crossbeam structure is fixedly connected in a cavity of the box, dividing the cavity into at least two accommodating cavities; a battery pack is arranged in the accommodating cavity, the battery pack includes at least two single cells arranged in sequence along a first direction, and the pole of the single cell is arranged at one end of the single cell along a second direction; the extended end surface of the pole of the single cell is arranged perpendicular to the bottom plate; a conductive bar is arranged between the battery pack and the crossbeam structure, and is arranged opposite to the crossbeam structure, and the poles of two adjacent single cells are connected through the conductive bar; wherein the first direction is perpendicular to the second direction; the ratio A of the width L1 of the crossbeam structure in the second direction to the length L2 of the single cell in the second direction satisfies 0.15≤A≤0.4. The battery device provided by the present invention avoids insufficient space utilization caused by an excessively large ratio A, and avoids insufficient support strength for the single cell when the ratio A is too small.

Description

Technical Field

[0001] The present invention relates to the technical field of battery devices, and in particular to a battery device. Background Art

[0002] Battery devices are widely used in various electrical devices to provide power. Battery devices usually include a box and multiple single cells arranged inside the box. At one end of the height direction of the single cell, a conductive bar is usually required to connect the single cells in series or in parallel. Usually, the height direction of the box of the battery device is consistent with the height direction of the single cell, and the height direction of the single cell is the lead-out direction of the battery pole.

[0003] Since the poles are led out from one end of the single cell in the height direction, and the poles of adjacent single cells are connected by conductive bars, the single cell has a high requirement for support strength in its height direction. However, when the single cell is placed horizontally in the box, that is, when the height direction of the single cell is perpendicular to the height direction of the box, the support strength of the ordinary box for the single cell in the height direction of the single cell is low. Summary of the invention

[0004] In view of this, the present invention provides a battery device to solve the problem that when the single battery is horizontally arranged in the box, the box has low supporting strength for the single battery in the height direction of the single battery.

[0005] The present invention provides a battery device, comprising:

[0006] 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;

[0007] At least one crossbeam structure is fixedly connected in the cavity of the box body and divides the cavity into at least two accommodating cavities;

[0008] A battery pack is arranged in the accommodating cavity, the battery pack comprises at least two single cells arranged in sequence along a first direction, a pole of the single cell is arranged at one end of the single cell along a second direction; and an extended end surface of the pole of the single cell is arranged perpendicular to the bottom plate;

[0009] A conductive bar, disposed between the battery pack and the crossbeam structure and arranged opposite to the crossbeam structure, the length extension direction of the conductive bar and the length extension direction of the crossbeam structure are both the first direction, and the poles of two adjacent single batteries are connected through the conductive bar;

[0010] The first direction is perpendicular to the second direction, and the first direction and the bottom plate are arranged in parallel, and a ratio A of a width L1 of the beam structure in the second direction to a length L2 of the single cell in the second direction satisfies 0.15≤A≤0.4.

[0011] Beneficial effects: the extended end surface of the pole of the single cell is arranged perpendicularly to the bottom plate, and the single cell is arranged horizontally in the cavity of the box body. The support strength requirement of the single cell in the second direction is high, which cannot be met by the ordinary box body, and the cross beam structure is fixedly connected in the cavity of the box body to increase the strength of the box body itself, and the length extension direction of the cross beam structure is the first direction, which can support at least two single cells arranged in sequence in the first direction in the second direction, improve the support strength of the single cell in the second direction, avoid the collision between the battery pack and the side of the box body, avoid the battery short circuit caused by the weak support strength in the second direction, and avoid the danger caused by the battery short circuit; in addition, because the ratio A of the width L1 of the cross beam structure in the second direction to the length L2 of the single cell in the second direction satisfies 0.15≤A≤0.4, the ratio A of the width L1 of the cross beam structure in the second direction to the length L2 of the single cell in the second direction is controlled, which can avoid the insufficient space utilization caused by the excessively large ratio A, and avoid the insufficient support strength of the single cell in the second direction when the ratio A is too small. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A partially enlarged schematic diagram of a local structure of a battery device according to an embodiment of the present invention;

[0014] Figure 2 A schematic diagram of the structure of a battery device (hidden on the top of the box) according to an embodiment of the present invention;

[0015] Figure 3 It is a partial enlarged schematic diagram of another partial structure of a battery device according to an embodiment of the present invention;

[0016] Figure 4 A partially enlarged schematic diagram of another partial structure of a battery device according to an embodiment of the present invention;

[0017] Figure 5A schematic diagram of a beam structure of an embodiment of the present invention from a viewing angle;

[0018] Figure 6 A schematic diagram of a beam structure of an embodiment of the present invention from another perspective;

[0019] Figure 7 FIG. 4 is a schematic diagram of another crossbeam structure according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Box body; 2. Beam structure; 21. First beam; 22. Second beam; 23. Opening; 24. Reinforcement; 3. Battery pack; 31. Single cell; 4. Conductive bar; 5. Cold plate. DETAILED DESCRIPTION

[0022] 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.

[0023] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0024] According to an embodiment of the present invention, a battery device is provided, comprising a box body 1, at least one crossbeam structure 2, a battery pack 3 and a conductive bar 4, wherein 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; at least one crossbeam structure 2 is fixedly connected to the cavity of the box body 1 and divides the cavity into at least two accommodating cavities; the battery pack 3 is arranged in the accommodating cavity, wherein the battery pack 3 comprises at least two single cells 31 arranged in sequence along a first direction, wherein the poles of the single cells 31 are arranged at one end of the single cells 31 along a second direction; and the extended end surface of the poles of the single cells 31 is connected to the conductive bar 4. The bottom plate is arranged vertically; the conductive bar 4 is arranged between the battery pack 3 and the beam structure 2, and is arranged opposite to the beam structure 2, the length extension direction of the conductive bar 4 and the length extension direction of the beam structure 2 are both the first direction, and the poles of two adjacent single batteries 31 are connected through the conductive bar 4; wherein, the first direction is perpendicular to the second direction, and the first direction and the bottom plate are arranged parallel, and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction satisfies, 0.15≤A≤0.4.

[0025] The extended end surface of the pole of the single battery 31 is arranged perpendicularly to the bottom plate, and the single battery 31 is arranged horizontally in the cavity of the box body 1. The support strength requirement of the single battery 31 in the second direction is relatively high, which cannot be met by an ordinary box body, and the crossbeam structure 2 is fixedly connected in the cavity of 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, which can support at least two single batteries 31 arranged in sequence in the first direction in the second direction, thereby improving the support strength of the single battery 31 in the second direction, avoiding collision between the battery pack 3 and the side of the box body 1, and avoiding the second direction. The battery short circuit caused by weak upward supporting strength can be avoided, thereby avoiding the danger caused by battery short circuit; in addition, since the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction satisfies 0.15≤A≤0.4, the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction is controlled, which can avoid insufficient space utilization caused by excessively large ratio A, and can also avoid insufficient supporting strength for the single battery 31 in the second direction when the ratio A is too small.

[0026] In a specific embodiment, the conductive row 4 and the beam structure 2 are spaced apart, and the space is smaller than the thickness of the conductive row 4 in the second direction.

[0027] Specifically, the second 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 second direction is the width extension direction of the beam structure 2.

[0028] In a specific embodiment, a ratio A of a width L1 of the beam structure 2 in the second direction to a length L2 of the single battery 31 in the second direction is 0.15.

[0029] In another specific embodiment, a ratio A of a width L1 of the beam structure 2 in the second direction to a length L2 of the single battery 31 in the second direction is 0.4.

[0030] In one embodiment, the width L1 of the beam structure 2 in the second direction is between 20 mm and 55 mm. Specifically, the width L1 can be 20 mm or 55 mm.

[0031] In one embodiment, the length L2 of the single battery 31 in the second direction is between 100 mm and 150 mm. Specifically, the length L2 can be 100 mm or 150 mm.

[0032] 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 second direction to a thickness L3 of the cross beam structure 2 satisfies 10≤B≤41.6.

[0033] When the ratio B of the width L1 of the beam structure 2 in the second 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 second 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 second 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 second 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 second direction is relatively large.

[0034] 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 second direction to a thickness L3 of the cross beam structure 2 is 10.

[0035] 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 second direction to a thickness L3 of the cross beam structure 2 is 41.6.

[0036] In one embodiment, a ratio C of a height H of the beam structure 2 in the third direction to a width L1 of the beam structure 2 in the second direction satisfies 0.86≤C≤3.8; wherein the first direction, the second direction and the third direction are perpendicular to each other; and the third direction is perpendicular to the bottom plate.

[0037] The ratio C of the height H of the beam structure 2 in the third direction to the width L1 of the beam structure 2 in the second direction can determine the supporting strength of the beam structure 2; when the height H of the beam structure 2 in the third direction is larger, the width L1 of the beam structure 2 in the second direction is correspondingly thickened; when the height H of the beam structure 2 in the third direction is smaller, the width L1 of the beam structure 2 in the second direction is correspondingly thinned.

[0038] In a specific embodiment, a ratio C of a height H of the beam structure 2 in the third direction to a width L1 of the beam structure 2 in the second direction is 0.86.

[0039] In another specific embodiment, a ratio C of a height H of the beam structure 2 in the third direction to a width L1 of the beam structure 2 in the second direction is 3.8.

[0040] Specifically, the second 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 crossbeam structure 2, and the second direction is the width extension direction of the crossbeam structure 2. The third direction is the height extension direction of the crossbeam structure 2, and is also the height extension direction of the box body 1.

[0041] In one embodiment, a height H of the beam structure 2 in the third direction satisfies 43 mm ≤ H ≤ 76.5 mm; wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0042] The height H of the beam structure 2 in the third direction should not be too large. If the height H of the beam structure 2 in the third 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 third direction should not be too small. If the height H of the beam structure 2 in the third direction is too small, the beam structure 2 cannot play a role in supporting the box body 1.

[0043] In a specific embodiment, the height H of the beam structure 2 in the third direction is 43 mm.

[0044] In another specific embodiment, the height H of the beam structure 2 in the third direction is 76.5 mm.

[0045] In one embodiment, the crossbeam structure 2 includes at least two crossbeams connected in sequence along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0046] At least two cross beams that are separately arranged and sequentially connected along the third direction can further enhance the self-strength and supporting strength of the cross beam structure 2.

[0047] Specifically, each cross beam is a tubular structure with a hollow interior.

[0048] In one embodiment, the beam structure 2 includes two beams connected in sequence along a third direction, the two beams are a first beam 21 and a second beam 22, each of the first beam 21 and the second beam 22 is provided with a plurality of openings 23, the number of openings 23 on the first beam 21 is greater than the number of openings 23 on the second beam 22, and the second beam 22 is connected to the bottom of the box body 1.

[0049] The openings 23 on the first beam 21 may include both openings 23 for connection and openings 23 for weight reduction. The number of openings 23 on the first beam 21 is greater than the number of openings 23 on the second beam 22, which can facilitate connection and weight reduction, ensure the integrity of the second beam 22, and enhance the overall strength and support strength of the beam structure 2.

[0050] Specifically, the openings 23 for connection on the first cross beam 21 include support connection holes for connecting support rings, and the support rings are used to support pipelines and / or lines. The openings 23 for connection on the first cross beam 21 also include hoisting holes for connecting hoisting structures.

[0051] In a preferred embodiment, the first cross beam 21 has openings 23 on the top and bottom in the third direction. The second cross beam 22 has openings 23 on the top and bottom in the third direction, and may also have openings 23 on the sidewall in the second direction.

[0052] Preferably, the height of the first cross beam 21 in the third direction is smaller than the height of the second cross beam 22 in the third direction.

[0053] In one embodiment, the single battery 31 is a cylindrical battery, and a ratio A of a width L1 of the beam structure 2 in the second direction to a length L2 of the single battery 31 in the second direction satisfies 0.15≤A≤0.38.

[0054] In a specific embodiment, a ratio A of a width L1 of the beam structure 2 in the second direction to a length L2 of the single battery 31 in the second direction may be 0.15.

[0055] Specifically, in another embodiment, a ratio A of a width L1 of the beam structure 2 in the second direction to a length L2 of the single battery 31 in the second direction may be 0.38.

[0056] In one embodiment, the thickness L3 of the beam structure 2 satisfies 0.8 mm ≤ L3 ≤ 2 mm; and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction satisfies 0.15 ≤ A ≤ 0.38.

[0057] In a specific embodiment, the thickness L3 of the beam structure 2 is 0.8 mm, and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction is 0.15.

[0058] Specifically, in another embodiment, the thickness L3 of the beam structure 2 is 0.8 mm, and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction is 0.38.

[0059] Specifically, in another embodiment, the thickness L3 of the beam structure 2 is 2 mm, and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction is 0.15.

[0060] Specifically, in another embodiment, the thickness L3 of the beam structure 2 is 2 mm, and the ratio A of the width L1 of the beam structure 2 in the second direction to the length L2 of the single battery 31 in the second direction is 0.38.

[0061] In one embodiment, two adjacent beams are bonded together by structural adhesive, which has a simple connection method, occupies a small space and has a firm connection.

[0062] In one embodiment, two adjacent cross beams are threadedly connected by fasteners, which is convenient for disassembly and installation and has a firm connection.

[0063] In one implementation, the first cross beam 21 is welded to the top of the box body 1 , which provides a relatively firm connection and can enhance the overall strength of the box body 1 .

[0064] 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 .

[0065] In one embodiment, a cavity is provided inside the second cross beam 22, a reinforcement member 24 is provided in the cavity, and a ratio X of a thickness of the reinforcement member 24 in the third direction to a width of the second cross beam 22 in the second direction is between 1 / 25 and 1 / 14.

[0066] The setting of the cavity of the second crossbeam 22 can reduce the weight of the crossbeam structure 2 and the battery device, and improve the energy density; the setting of the reinforcement 24 can further reinforce the second crossbeam 22, support the single battery, improve the overall strength of the crossbeam structure 2, and prevent the crossbeam structure from being squeezed too much. The thickness of the reinforcement 24 should not be too thin, otherwise the supporting effect will be poor; the thickness of the reinforcement 24 should not be too thick, otherwise the energy density of the box will be reduced. The ratio X of the thickness of the reinforcement 24 in the third direction to the width of the second crossbeam 22 in the second direction is between 1 / 25 and 1 / 14, which can make the reinforcement 24 have a more moderate thickness, maintain a certain support strength, and will not take up too much space to reduce the energy density of the battery.

[0067] In a specific embodiment, a ratio X of a thickness of the reinforcement member 24 in the third direction to a width of the second beam 22 in the second direction is 1 / 25.

[0068] In another specific embodiment, a ratio X of the thickness of the reinforcement member 24 in the third direction to the width of the second beam 22 in the second direction is 1 / 14.

[0069] In one embodiment, the battery pack 3 includes two columns arranged in sequence along the second 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 second 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.

[0070] 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 second direction.

[0071] In one embodiment, a ratio Y of the thickness of the cold plate 5 in the second direction to the width of the beam structure 2 in the second direction is between 1 / 20 and 1 / 14.

[0072] The cold plate should not be too thick, otherwise the energy density of the box will be reduced; nor should it be too thin, otherwise the heat exchange efficiency of the cold plate will be affected. Therefore, in this embodiment, the ratio Y of the thickness of the cold plate 5 in the second direction to the width of the beam structure 2 in the second direction is between 1 / 20 and 1 / 14, so that a cold plate with moderate thickness can be obtained, which will not reduce the energy density of the box and ensure the heat exchange efficiency of the cold plate.

[0073] In a specific embodiment, a ratio Y of the thickness of the cold plate 5 in the second direction to the width of the beam structure 2 in the second direction is 1 / 20.

[0074] In another specific embodiment, a ratio Y of the thickness of the cold plate 5 in the second direction to the width of the beam structure 2 in the second direction is 1 / 14.

[0075] In a specific embodiment, Figure 7 As shown, the cross beam structure 2 is a tubular structure with a hollow interior and is an integrally formed structure. Specifically, the cross beam structure 2 is roll-formed. The height H of the cross beam structure 2 in the third direction and the thickness L3 of the cross beam structure 2 are as shown in FIG. Figure 7 shown.

[0076] In another specific embodiment, Figure 5 and Figure 6 As shown, the beam structure 2 includes two beams connected in sequence along the third 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 third 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.

[0077] The height H of the beam structure 2 in the third direction satisfies: H= H1+ H2.

[0078] The second cross beam 22 is a hollow tubular structure, which can reduce the weight of the battery device and improve the energy density. A reinforcing member 24 is arranged in the hollow cavity, and the reinforcing member 24 can reinforce the second cross beam 22 and improve the strength of the battery device.

[0079] In the third direction, the ratio D of the first height H1 of the first beam 21 and the second height H2 of the second beam 22 satisfies 0.25≤D≤0.4. The second beam 22 mainly plays a role in enhancing the structural strength of the battery device, and the first beam 21 needs to be able to withstand the weight of the entire battery device during hoisting. Therefore, if the ratio D is too small, the structural strength of the first beam 21 is insufficient, and there may be safety hazards during hoisting. Bolts need to be installed on the first beam 21, and the first height of the first beam 21 is too low, which will leave too little space for bolts to be locked; if the ratio D is too large, the height of the first beam 21 is too high, which will affect the wiring layout above the first beam 21.

[0080] 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, It is 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; At least one crossbeam structure (2) fixedly connected in the cavity of the box body (1) and dividing the cavity into at least two accommodating cavities; A battery pack (3) is arranged in the accommodating cavity, the battery pack (3) comprising at least two single cells (31) arranged in sequence along a first direction, the poles of the single cells (31) being arranged at one end of the single cells (31) along a second direction; and the extended end surface of the pole of the single cell (31) being arranged perpendicular to the bottom plate; A conductive bar (4) is arranged between the battery pack (3) and the crossbeam structure (2), and is arranged opposite to the crossbeam structure (2); the length of the crossbeam structure (2) extends in the first direction; and the poles of two adjacent single batteries (31) are connected via the conductive bar (4); The first direction is perpendicular to the second direction, and the first direction is arranged parallel to the bottom plate. The width L of the crossbeam structure (2) in the second direction is 1 The length L of the single battery (31) in the second direction 2 The ratio A satisfies 0.15≤A≤0.

4.

2. The battery device according to claim 1, It is characterized in that The crossbeam structure (2) is a tubular structure with a hollow interior, and the width L of the crossbeam structure (2) in the second direction is 1 and the thickness L of the beam structure (2) 3 The ratio B satisfies 10≤B≤41.

6.

3. The battery device according to claim 1, It is characterized in that The height H of the crossbeam structure (2) in the third direction and the width L of the crossbeam structure (2) in the second direction are 1 The ratio C satisfies 0.86≤C≤3.8; The first direction, the second direction and the third direction are perpendicular to each other, and the third direction is perpendicular to the bottom plate.

4. The battery device according to claim 1, It is characterized in that The height H of the crossbeam structure (2) in the third direction satisfies 43 mm ≤ H ≤ 76.5 mm; The first direction, the second direction and the third direction are perpendicular to each other.

5. The battery device according to any one of claims 1 to 4, It is characterized in that The crossbeam structure (2) comprises at least two crossbeams connected in sequence along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery device according to claim 5, It is characterized in that The crossbeam structure (2) comprises two crossbeams connected in sequence along a third direction, the two crossbeams being a first crossbeam (21) and a second crossbeam (22), the first crossbeam (21) and the second crossbeam (22) being provided with a plurality of openings (23), the number of the openings (23) on the first crossbeam (21) being greater than the number of the openings (23) on the second crossbeam (22), the first crossbeam (21) being connected to the top of the box body (1), and the second crossbeam (22) being connected to the bottom of the box body (1).

7. The battery device according to any one of claims 1 to 4 or 6, It is characterized in that The single battery (31) is a cylindrical battery, and the width L of the crossbeam structure (2) in the second direction is 1 The length L of the single battery (31) in the second direction 2 The ratio A satisfies 0.15≤A≤0.38; and / or, the thickness L of the crossbeam structure (2) 3 Satisfies: 0.8 mm ≤ L3 ≤ 2 mm; the width L of the beam structure (2) in the second direction 1 The length L of the single battery (31) in the second direction 2 The ratio A satisfies 0.15≤A≤0.

38.

8. The battery device according to claim 6, It is characterized in that The first crossbeam (21) is welded to the top of the box body (1); and / or, the second cross beam (22) is welded to the bottom of the box body (1); And / or, a cavity is provided inside the second crossbeam (22), a reinforcement member (24) is provided in the cavity, and a ratio X of a thickness of the reinforcement member (24) in the third direction to a width of the second crossbeam (22) in the second direction is between 1 / 25 and 1 / 14.

9. The battery device according to any one of claims 1 to 4 or 6 or 8, It is characterized in that The battery pack (3) comprises two columns arranged in sequence along the second direction, each column comprising at least two single cells (31) arranged in sequence along the first direction; an end of the single cell (31) away from the pole in the second 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 further comprises a cold plate (5), and the cold plate (5) is connected between the cooling ends of the two columns of single cells (31).

10. The battery device according to claim 9, It is characterized in that A ratio Y of the thickness of the cold plate (5) in the second direction to the width of the crossbeam structure (2) in the second direction is between 1 / 20 and 1 / 14.

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