Battery device

Abstract

Battery device comprising the following: a housing (1) comprising a lower plate and a surrounding frame around the lower plate, wherein the lower plate and the surrounding frame form a cavity; at least one support structure (2) whose two ends are fixedly connected in a first direction to a surrounding frame of the housing (1) and which divides the housing (1) into at least two receiving spaces, wherein the receiving spaces are designed to receive a battery pack (3); wherein the support structure (2) has at least two supports which are stacked and fastened one above the other in a second direction, and a lifting hole is arranged on one side of a support which is located away from the lower plate in the second direction, wherein the support is one of the at least two supports which is located away from the lower plate in the second direction; wherein the lifting hole is designed to lift the housing (1); where the first direction is parallel to the lower plate and the second direction is perpendicular to the lower plate.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of battery devices and relates in particular to a battery device. BACKGROUND

[0002] A battery power supply is widely used in various electrical devices. A battery power supply typically consists of a housing and several battery cells arranged within the housing. A conductive busbar is usually required at one end, along the vertical axis of the battery cells, to connect them in series or parallel.

[0003] Typically, to improve the structural strength of the battery device, a support structure is incorporated into the battery housing, dividing the housing into separate compartments for each battery cell. However, a lifting point is usually provided on the support structure, and attaching this lifting point requires drilling a hole in the end of the support structure, thus reducing its structural strength. SUMMARY

[0004] In view of this, the present application provides a battery device to solve the problem that the structural strength of the support is reduced because drilling a hole at the end of the support is required during the attachment of a lifting point.

[0005] The present application provides a battery device comprising: a housing having a lower plate and a surrounding frame around the lower plate, wherein the lower plate and the surrounding frame form a cavity; at least one support structure, both ends of which are fixedly connected in a first direction to a side frame of the housing and which divides the housing into at least two receiving spaces, wherein the receiving space is configured to receive a battery pack; wherein the support structure has at least two supports which are stacked and fastened one above the other in a second direction, and a lifting hole is arranged on one side of a support which is located away from the lower plate in the second direction, wherein the support is one of the at least two supports which is located away from the lower plate in the second direction; wherein the lifting hole is configured for lifting the housing;where the first direction is parallel to the lower plate and the second direction is perpendicular to the lower plate.

[0006] Advantageous effects: The support structure comprises at least two beams stacked and fastened one above the other, and a lifting hole is provided only on one side of a beam located in the second direction away from the lower plate. This lifting hole is used to attach a lifting point for raising the housing, and the number of holes on the other beam can be reduced, thus ensuring the integrity of the other beam and the overall strength of the support structure, thereby improving the structural strength of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] To better illustrate the technical solution in the specific embodiment of the present application or in the prior art, the drawing necessary to describe the specific embodiment or the prior art is briefly presented below. The drawing described below is clearly a specific embodiment of the present invention. A person skilled in the art can derive another drawing from these drawings without any creative effort. Fig. Figure 1 is a partially enlarged schematic view of a local structure of a battery device according to an embodiment of the present application; Fig. Figure 2 is a schematic structural view of a battery device (with the top of the housing hidden) according to an embodiment of the present application; Fig. Figure 3 is a partially enlarged schematic view of another local structure of a battery device according to an embodiment of the present application; Fig. Figure 4 is a partially enlarged schematic view of yet another local structure of a battery device according to an embodiment of the present application; Fig. Figure 5 is a schematic view of a support structure from a perspective according to an embodiment of the present application; and Fig. Figure 6 is a schematic view of a support structure from a different perspective according to an embodiment of the present application. Reference symbol:

[0008] 1, Housing; 2, Support structure; 21, First support; 22, Second support; 23, Opening; 24, Reinforcing element; 3, Battery pack; 31, Battery cell; 4, Conductive busbar; 5, Cooling plate. DETAILED DESCRIPTION

[0009] To clarify the objective, the technical solution, and the advantage of the embodiment of the present application, the technical solution in the embodiment of the present application is described below in a clear and complete manner in conjunction with the drawing of the embodiment of the present application. Obviously, the described embodiment is part of the embodiment of the present application and not all embodiments. All other embodiments that the person skilled in the art can determine without creative effort based on the embodiment of the present application fall within the scope of protection of the present application.

[0010] The embodiments of the present application are described below in conjunction with Fig. 1 to Fig. 6 described.

[0011] According to one embodiment of the present application, a battery device is provided comprising a housing 1 and at least one support structure 2; wherein the housing 1 has a lower plate and a surrounding frame around the lower plate, the lower plate and the surrounding frame forming a cavity; wherein two ends of the at least one support structure 2 are fixedly connected in a first direction to the surrounding frame of the housing 1 and the housing 1 is divided into at least two receiving spaces, the receiving space being configured to receive a battery pack 3;wherein the support structure 2 comprises at least two supports stacked and fastened one above the other in a second direction, and a lever hole is arranged on one side of a support which is located away from the lower plate in the second direction, wherein the support is one of the at least two supports which is located away from the lower plate in the second direction; wherein the lever hole is designed for lifting the housing 1; wherein the first direction is a direction parallel to the lower plate and the second direction is a direction perpendicular to the lower plate.

[0012] The support structure 2 has at least two supports stacked and fastened one above the other, with a lever hole located on only one side of one support, facing away from the lower plate. The lever hole is used to attach a lifting point for lifting the housing 1, and the number of holes on the other support can be reduced, thus ensuring the integrity of the other support and the overall strength of the support structure 2, thereby improving the structural strength of the battery device.

[0013] In particular, an opening 23 for weight reduction and connection is arranged on each beam of the support structure 2, wherein the number of openings 23 for weight reduction and connection on one beam is greater on one side than on the other beam, thereby enabling connection and weight reduction while ensuring the integrity of the beam with a smaller number of openings 23, thereby improving the overall strength and support force of the support structure 2.

[0014] In one embodiment, the support structure 2 has two supports stacked and fastened one above the other in the second direction, namely a first support 21 and a second support 22. The lever hole is arranged on the first support 21, the second support 22 has a cavity inside, and a reinforcing element 24 is fastened in the cavity.

[0015] By providing the cavity, the weight of the support structure 2 and the weight of the battery device can be reduced, thereby improving the energy density; by providing the reinforcing element 24, the second support 22 can be further reinforced, thereby improving the overall strength of the support structure 2. The provision of the cavity and the reinforcing element 24 reduces both the weight of the support structure 2 and the weight of the battery device, while also improving the strength of the support structure 2 and the entire battery pack. In particular, an opening 23 can also be arranged on the reinforcing element 24.

[0016] In one embodiment, the reinforcing element 24 has a plate structure, the reinforcing element 24 extends in the first direction, and two sides of the reinforcing element 24 are each firmly connected in a third direction to two side walls of the cavity of the second support 22; and the first direction, the second direction, and the third direction are perpendicular to each other.

[0017] The reinforcing element 24 extends in the first direction, and two sides of the reinforcing element 24 are each firmly connected in the third direction to the two side walls of the cavity of the second beam 22, thus providing support in both the first and third directions and thereby improving the strength of the second beam 22 in both directions. Furthermore, the reinforcing element 24 has a plate structure, and thus the reinforcing element has a simple structure, occupies little space, does not significantly increase the overall weight of the second beam 22, and facilitates the connection.

[0018] In one embodiment, the reinforcing element 24 has a tubular structure, the reinforcing element 24 extends in the first direction, and two sides of the reinforcing element 24 are each firmly connected in a third direction to two side walls of the cavity of the second support 22; and the first direction, the second direction, and the third direction are perpendicular to each other.

[0019] The reinforcing element 24 extends in the first direction, and its two sides are each firmly connected in the third direction to the two side walls of the cavity of the second beam 22, thus providing support in both the first and third directions and improving the strength of the second beam 22 in both directions. Furthermore, the reinforcing element 24 has a tubular structure and thus forms an interlocking tubular structure with the second beam 22, thereby increasing the connection area between the reinforcing element 24 and the side walls of the cavity of the second beam 22, thus providing a further improvement in the strength of the second beam 22 in both the first and third directions.Furthermore, since the reinforcing element 24 is a tubular structure, the reinforcing element 24 does not significantly increase the overall weight of the second support 22 and also facilitates the connection of the reinforcing element 24.

[0020] In a preferred embodiment, the extension length of the reinforcing element 24 in the first direction corresponds to the extension length of the second support 22 in the first direction, and both ends of the reinforcing element 24 are firmly connected to the surrounding frame of the housing 1 in the first direction.

[0021] In one embodiment, the reinforcing element 24 is welded to and attached to the second support 22.

[0022] Since the reinforcement element 24 is welded to and attached to the second support 22, good connection strength is ensured.

[0023] In another embodiment, the reinforcing element 24 is firmly connected to the second support 22 via a fastening means.

[0024] Because the reinforcement element 24 is firmly connected to the second support 22 via a fastening element, disassembly and replacement of the reinforcement element 24 are facilitated. The fastening element can be a fastening structure such as a screw, a bolt, or a snap fastener.

[0025] In one embodiment, the height (i.e., the dimension in the second direction, the same below) of the first support 21 in the second direction is less than the height of the second support 22 in the second direction.

[0026] In a specific embodiment, the height of the first support 21 in the second direction is no more than 7 mm.

[0027] In one embodiment, the ratio X of the height of the first support 21 in the second direction to the height of the second support 22 in the second direction is in a range of 0.25 to 0.4.

[0028] The second support 22 primarily serves to improve the structural strength of the battery assembly, while the first support 21 must withstand the weight of the complete battery assembly during lifting. Therefore, if the ratio of the height of the first support 21 to the height of the second support 22 were too small in the second direction, the structural strength of the first support 21 would be insufficient, potentially creating a safety hazard during lifting. Since a bolt must be attached to the first support 21, a small height of the first support 21 would not provide enough space for a bolt lock. If the ratio of the height of the first support 21 to the height of the second support 22 in the second direction were too large, the height of the first support 21 would be too great, which would affect the cable arrangement on the side of the first support 21 facing away from the second support 22.In this embodiment, the ratio X of the height of the first support 21 to the height of the second support 22 in the second direction lies within a range of 0.25 to 0.4, thereby ensuring that the heights of the first support 21 and the second support 22 are within an acceptable range, thus guaranteeing the structural strength of the first support 21, avoiding a safety risk during lifting, ensuring that the first support 21 can provide sufficient locking space, and also preventing any disruptive influence on a cable arrangement on the side of the first support 21 facing away from the second support 22.

[0029] In a specific embodiment, the ratio X of the height of the first support 21 in the second direction to the height of the second support 22 in the second direction is 0.25.

[0030] In another specific embodiment, the ratio X of the height of the first support 21 in the second direction to the height of the second support 22 in the second direction is 0.4.

[0031] In one embodiment, the first support 21 and the second support 22 are bonded together. Bonding the first support 21 and the second support 22 ensures good bond strength.

[0032] In one embodiment, when the first support 21 and the second support 22 are bonded together, the ratio X of the height of the first support 21 to the height of the second support 22 in the second direction is in a range of 0.25 to 0.4.

[0033] The first support 21 and the second support 22 can be bonded using a structural adhesive. The structural adhesive has a minimal impact on the structure of the support structure 2. Consequently, by ensuring that the ratio X of the height of the first support 21 to the height of the second support 22 in the second direction is between 0.25 and 0.4, it is ensured that the heights of the first support 21 and the second support 22 are within an acceptable range, thereby guaranteeing the structural strength of the first support 21, avoiding a safety risk during lifting, ensuring that the first support 21 provides sufficient locking space, and also preventing any interference with a cable arrangement on the side of the first support 21 facing away from the second support 22.

[0034] In one embodiment, the first support 21 and the second support 22 are welded together. This welding of the first support 21 and the second support 22 ensures good connection strength, thus preventing the battery from being easily damaged or failing.

[0035] In one embodiment, when the first support 21 and the second support 22 are welded together, the ratio X of the height of the first support 21 to the height of the second support 22 in the second direction is in a range of 0.3 to 0.4.

[0036] When the first beam 21 and the second beam 22 are welded together, the heat generated during welding causes some deformation of both beams. To ensure the strength of the first beam, its height must be increased accordingly. Therefore, the ratio X of the height of the first beam 21 to the height of the second beam 22 in the second direction is between 0.3 and 0.4. This ensures that the heights of the first beam 21 and the second beam 22 are within an acceptable range, guaranteeing the structural strength of the first beam 21, avoiding safety risks during lifting, ensuring that the first beam 21 provides sufficient locking space, and preventing any interference with a cable arrangement on the side of the first beam 21 facing away from the second beam 22.

[0037] In one embodiment, when the first support 21 and the second support 22 are bonded and welded together, the ratio X of the height of the first support 21 to the height of the second support 22 in the second direction is in a range of 0.2 to 0.4.

[0038] When the first support 21 and the second support 22 are welded together, the heat generated during welding causes a certain deformation of the first support 21 and the second support 22. At the same time, the adhesive layer can provide support for the first support 21 and the second support 22, thus allowing a corresponding reduction in the height of the first support 21.Accordingly, the ratio X of the height of the first beam 21 to the height of the second beam 22 in the second direction is within 0.2 to 0.4, which ensures that the heights of the first beam 21 and the second beam 22 are within an acceptable range, thereby guaranteeing the structural strength of the first beam 21, avoiding a safety risk during lifting, ensuring that the first beam 21 provides sufficient locking space, and also preventing any disruptive influence on a cable arrangement on the side of the first beam 21 facing away from the second beam 22.

[0039] In one embodiment, the first support 21 and the second support 22 are firmly connected via a fastening means.

[0040] The fact that the first support 21 and the second support 22 are firmly connected by a fastener facilitates the disassembly and replacement of the first support 21 and the second support 22. The fastener can be a fastening structure such as a screw, a bolt, or a snap fastener.

[0041] In one embodiment, the first support 21 is welded to the top of the housing 1, thereby providing a firm connection and improving the overall strength of the housing 1.

[0042] In one embodiment, the second support 22 is welded to the underside of the housing 1, thereby providing a firm connection and improving the overall strength of the housing 1.

[0043] If the space occupied by the reinforcing element 24 in the cavity of the second support 22 is small, the reinforcing effect of the reinforcing element 24 is poor; if the space occupied by the reinforcing element 24 in the cavity of the second support 22 is large, the weight of the support structure 2 and the weight of the entire battery device are higher, which affects the energy density of the entire battery device. Therefore, the reinforcing element 24 must have a corresponding thickness.

[0044] In one embodiment, the support with the lever hole is the first support 21 and the other support is a second support 22. The first support 21 is made of aluminum, and the second support 22 is made of aluminum or steel.

[0045] In a specific embodiment, the first support 21 is made of aluminium and the second support 22 is made of aluminium.

[0046] In another specific embodiment, the first support 21 is made of aluminium and the second support 22 is made of steel.

[0047] In one embodiment, the battery pack 3 comprises at least two battery cells 31 arranged sequentially in the first direction, and a terminal of the battery cell 31 is arranged at one end of the battery cell 31 in the third direction; a conductive busbar 4 is arranged between the battery pack 3 and the support structure 2 and is positioned opposite the support structure 2, wherein the longitudinal direction of the conductive busbar 4 and the longitudinal direction of the support structure 2 each correspond to the first direction, and the terminals of two adjacent battery cells 31 are connected via the conductive busbar 4; the ratio A of the width L1 of the support structure 2 in the third direction to the length L2 of the battery cell 31 in the third direction satisfies 0.15 ≤ A ≤ 0.4. The projecting end face of the battery cell 31 terminal is arranged perpendicular to the lower plate; and the third direction is parallel to the lower plate.

[0048] The support structure 2 is rigidly connected to the housing 1, thereby increasing the inherent strength of the housing 1. Furthermore, the longitudinal direction of the support structure 2 corresponds to the first direction, thus providing support in the third direction for at least two battery cells 31 arranged sequentially in the first direction. This improves the support strength for the battery cells 31 in the third direction, prevents collisions between the battery pack 3 and the side of the housing 1, and avoids battery short circuits caused by weak support in the third direction, thereby preventing the hazards associated with such short circuits. Additionally, the ratio A of the width L1 of the support structure 2 in the third direction to the length L2 of the battery cell 31 in the third direction is 0.15 ≤ A ≤ 0.4.By influencing the ratio A of the width L1 of the support structure 2 in the third direction to the length L2 of the battery cell 31 in the third direction, both inadequate space utilization, if the ratio A is too large, and inadequate support strength for the battery cell 31 in the third direction, if the ratio A is too small, can be avoided.

[0049] In a specific embodiment, the conductive busbar 4 and the support structure 2 are arranged with a gap between them, and this gap is smaller than the thickness of the conductive busbar 4 in the third direction.

[0050] In particular, the third direction is the longitudinal direction of the battery cell 31 and also the protruding direction of the connection of the battery cell 31. The first direction is the longitudinal direction of the support structure 2, and the third direction is the lateral direction of the support structure 2.

[0051] In a specific embodiment, the ratio A of the width L1 of the support structure 2 in the third direction to the length L2 of the battery cell 31 in the third direction is 0.15.

[0052] In another specific embodiment, the ratio A of the width L1 of the support structure 2 in the third direction to the length L2 of the battery cell 31 in the third direction is 0.4.

[0053] In one embodiment, the width L1 of the support structure 2 in the third direction is between 20 mm and 55 mm. In particular, the width L1 can be 20 mm or 55 mm.

[0054] In one embodiment, the length L2 of the battery cell 31 in the third direction is between 100 mm and 150 mm. In particular, the length L2 can be 100 mm or can be 150 mm.

[0055] In one embodiment, the support structure 2 has a hollow tubular structure and satisfies the ratio B of the width L1 of the support structure 2 in the third direction to the thickness (i.e., the thickness of the wall of the support structure 2) L3 of the support structure 2 10≤B≤41.6.

[0056] If the ratio B of the width L1 of the support structure 2 in the third direction to the thickness L3 of the support structure 2 is too large, the thickness of the support structure 2 is too small, the intrinsic strength of the support structure 2 is low, and the stability is poor; if the ratio B of the width L1 of the support structure 2 in the third direction to the thickness L3 of the support structure 2 is too small, the thickness of the support structure 2 is too large, the buffer space provided by the hollow interior of the support structure 2 is too small, the support strength of the support structure 2 in the third direction is poor, and insufficient buffer space is provided.In this embodiment, the ratio B of the width L1 of the support structure 2 in the third direction to the thickness L3 of the support structure 2 is 10≤B≤41.6, and thus the thickness of the support structure 2 is moderate, ensuring that the support structure 2 itself has high strength and good stability, and also ensuring that the buffer space provided by the hollow interior of the support structure 2 is sufficient, and the support strength of the support structure 2 in the third direction is large.

[0057] In a specific embodiment, the support structure 2 has a hollow tubular structure and the ratio B of the width L1 of the support structure 2 in the third direction to the thickness L3 of the support structure 2 is 10.

[0058] In another specific embodiment, the support structure 2 has a hollow tubular structure and the ratio B of the width L1 of the support structure 2 in the third direction to the thickness L3 of the support structure 2 is 41.6.

[0059] In one embodiment, the ratio C of the height H of the support structure 2 in the second direction to the width L1 of the support structure 2 in the third direction satisfies 0.86≤C≤3.8; and the first direction, the third direction and the second direction are perpendicular to each other.

[0060] The ratio C of the height H of the support structure 2 in the second direction to the width L1 of the support structure 2 in the third direction can determine the support strength of the support structure 2; if the height H of the support structure 2 in the second direction is greater, the width L1 of the support structure 2 in the third direction is correspondingly thicker; if the height H of the support structure 2 in the second direction is smaller, the width L1 of the support structure 2 in the third direction is correspondingly thinner.

[0061] In a specific embodiment, the ratio C of the height H of the support structure 2 in the second direction to the width L1 of the support structure 2 in the third direction is 0.86.

[0062] In another specific embodiment, the ratio C of the height H of the support structure 2 in the second direction to the width L1 of the support structure 2 in the third direction is 3.8.

[0063] In particular, the third direction is the longitudinal direction of the battery cell 31 and also the protruding direction of the battery cell 31 connection. The first direction is the longitudinal direction of the support structure 2, and the third direction is the lateral direction of the support structure 2. The second direction is the vertical direction of the support structure 2, and the second direction is also the vertical direction of the housing 1.

[0064] In one embodiment, the height H of the support structure 2 in the second direction satisfies 43mm≤H≤76.5mm; and the first direction, the third direction and the second direction are perpendicular to each other.

[0065] The height H of the support structure 2 in the second direction should not be too great. If the height H of the support structure 2 in the second direction is too great, the support structure 2 will occupy too much space in the enclosure 1, which will not contribute to improving the space utilization in the enclosure 1. The height H of the support structure 2 in the second direction should not be too small. If the height H of the support structure 2 in the second direction is too small, the support structure 2 will not be able to fulfill its function of supporting the enclosure 1.

[0066] In a specific embodiment, the height H of the support structure 2 in the second direction is 43 mm.

[0067] In another specific embodiment, the height H of the support structure 2 in the second direction is 76.5 mm.

[0068] In one embodiment, the support structure 2 has at least two supports which are connected one above the other in the second direction; and the first direction, the third direction and the second direction are perpendicular to each other.

[0069] By separately providing that at least two beams are connected one above the other in the second direction, both the intrinsic strength and the support strength of the beam structure 2 can be improved.

[0070] In particular, each support has a hollow, tubular structure.

[0071] In one embodiment, the battery pack 3 has two rows arranged one after the other in the third direction, each row having at least two battery cells 31 arranged one after the other in the first direction; the end of the battery cell 31 that is located away from the terminal in the third direction is a cooling end and the cooling ends of the two rows of battery cells 31 are arranged opposite each other; and the battery device further has a cooling plate 5 which is connected between the cooling ends of the two rows of battery cells 31.

[0072] By arranging the cooling plate 5 between the cooling ends of the two rows of battery cells 31, heat exchange for the battery cells 31 is permitted, and support for the battery cell 31 in the third direction is provided.

[0073] In a specific embodiment as shown in Fig. 5 and Fig. Figure 6 shows that the support structure 2 has two beams connected one above the other in the second direction, the two beams being a first beam 21 and a second beam 22. The thickness L3 of the support structure 2 has the first thickness L3, of the first beam 21 and the second thickness L 32 of the second support 22; the height H of the support structure 2 in the second direction has the first height H1 of the first support 21 and the second height H2 of the second support 22, as in Fig. 6 is shown.

[0074] The height H of the support structure 2 in the second direction satisfies H = H1 + H2.

[0075] Although the embodiment of the present application has been described in conjunction with the drawings, the person skilled in the art can make various modifications and variations without deviating from the basic idea and scope of protection of the present application, and such modifications and variations fall within the scope of protection defined by this application.

Claims

[1] Battery device comprising the following: a housing (1) comprising a lower plate and a surrounding frame around the lower plate, wherein the lower plate and the surrounding frame form a cavity; at least one support structure (2) whose two ends are fixedly connected in a first direction to a surrounding frame of the housing (1) and which divides the housing (1) into at least two receiving spaces, wherein the receiving spaces are designed to receive a battery pack (3); wherein the support structure (2) has at least two supports which are stacked and fastened one above the other in a second direction, and a lifting hole is arranged on one side of a support which is located away from the lower plate in the second direction, wherein the support is one of the at least two supports which is located away from the lower plate in the second direction; wherein the lifting hole is designed to lift the housing (1); where the first direction is parallel to the lower plate and the second direction is perpendicular to the lower plate. [2] Battery device according to claim 1, wherein the support structure (2) comprises two supports stacked and fastened one above the other in the second direction, the first support being a first support (21) and the second support being a second support (22), the lever hole being arranged on the first support (21), the second support (22) having a cavity inside and a reinforcing element (24) being fastened in the cavity. [3] Battery device according to claim 2, wherein the reinforcing element (24) has a plate structure, the reinforcing element (24) extends in the first direction and two sides of the reinforcing element (24) are each firmly connected in a third direction to two side walls of the cavity of the second support (22); and the first direction, the second direction and the third direction are perpendicular to each other. [4] Battery device according to claim 2, wherein the reinforcing element (24) has a tubular structure, the reinforcing element (24) extends in the first direction and two sides of the reinforcing element (24) are each firmly connected in a third direction to two side walls of the cavity of the second support (22); and the first direction, the second direction and the third direction are perpendicular to each other. [5] Battery device according to claim 3 or 4, wherein the reinforcing element (24) is welded to and attached to the second support (22); or the reinforcing element (24) is firmly connected to the second support (22) via a fastening means. [6] Battery device according to one of claims 2 to 4, wherein the height of the first support (21) in the second direction is less than the height of the second support (22) in the second direction. [7] Battery device according to claim 6, wherein the ratio X of the height of the first support (21) to the height of the second support (22) in the second direction is in a range of 0.25 to 0.

4. [8] Battery device according to any one of claims 2 to 4, wherein the first support (21) and the second support (22) are bonded together; and / or the first support (21) and the second support (22) are firmly connected by a fastening means; and / or the first support (21) and the second support (22) are welded together. [9] Battery device according to claim 8, wherein, when the first support (21) and the second support (22) are bonded together, the ratio X of the height of the first support (21) to the height of the second support (22) in the second direction is in a range of 0.25 to 0.4; and / or, if the first beam (21) and the second beam (22) are welded together, the ratio X of the height of the first beam (21) to the height of the second beam (22) in the second direction is in a range of 0.3 to 0.4; and / or, if the first support (21) and the second support (22) are bonded and welded together, the ratio X of the height of the first support (21) to the height of the second support (22) in the second direction is in a range of 0.2 to 0.

4. [10] Battery device according to any one of claims 1 to 4, wherein the support provided with the lever hole is a first support (21), each other support is a second support (22), the first support (21) is made of aluminium and the second support (22) is made of aluminium or steel. [11] Battery device according to one of the preceding claims, wherein the battery pack (3) comprises: at least two battery cells (31) arranged one after the other in the first direction, and a terminal of the battery cell (31) at one end of the battery cell (31) arranged in the third direction; a conductive busbar (4) arranged between the battery pack (3) and the support structure (2) and opposite the support structure 2, wherein the longitudinal direction of the conductive busbar (4) and the longitudinal direction of the support structure (2) each correspond to the first direction and the terminals of two adjacent battery cells (31) are connected via the conductive busbar (4). [12] Battery device according to claim 11, wherein the ratio A of the width L1 of the support structure (2) in the third direction to the length L2 of the battery cell (31) in the third direction satisfies 0.15≤A≤0.4, and wherein the projecting end face of the connection of the battery cell (31) is arranged perpendicular to the lower plate and the third direction is parallel to the lower plate. [13] Battery device according to claim 10 or 11, wherein the ratio A of the width L1 of the support structure (2) in the third direction to the length L2 of the battery cell (31) in the third direction is 0.15, preferably 0.

4. [14] Battery device according to one of claims 10 to 13, wherein the width L1 of the support structure (2) in the third direction is between 20 mm and 55 mm, preferably the width L1 is 20 mm or 55 mm. [15] Battery device according to any one of claims 10 to 14, wherein the width L2 of the support structure (2) in the third direction is between 100 mm and 150 mm, preferably the width L2 is 100 mm or 150 mm. [16] Battery device according to any one of claims 10 to 15, the support structure (2) having a hollow tubular structure and the ratio B of the width L1 of the support structure (2) in the third direction to the thickness L3 of the support structure (2) is 10≤B≤41.

6. [17] Battery device according to claim 16, wherein the ratio B is 10 or 41.

6. [18] Battery device according to one of claims 10 to 17, wherein the ratio C of the height H of the support structure (2) in the second direction to the width L1 of the support structure (2) in the third direction is 0.86≤C≤3.8, wherein the first direction, the third direction and the second direction are perpendicular to each other. [19] Battery device according to claim 18, wherein the ratio C is 0.86 or 3.

8. [20] Battery device according to one of the preceding claims, wherein the battery pack (3) has two rows arranged one after the other in the third direction, wherein each column has at least two battery cells (31) arranged one after the other in the first direction, wherein the end of the battery cell (31) which is located in the third direction away from the terminal is a cooling end, and the cooling ends of the two rows of battery cells (31) are arranged opposite each other, and the battery device further comprises a cooling plate (5) which is connected between the cooling ends of the two rows of battery cells (31).

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