Battery device

Abstract

Battery device, comprising: 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) which is firmly connected in the cavity of the housing (1) and divides the cavity into at least two receiving cavities; a battery pack (3) arranged in a receiving cavity, wherein the battery pack (3) comprises at least two battery cells (31) arranged one after the other in a first direction, a terminal of the battery cell (31) arranged in a second direction at one end of the battery cell (31); wherein a protruding end face of the terminal of the battery cell (31) is arranged perpendicular to the lower plate; a conductive busbar (4) which is arranged between the battery pack (3) and the support structure (2) and is arranged opposite the support structure (2), wherein a longitudinal direction of the support structure (2) is the first direction and the terminals of two adjacent battery cells (31) are connected by the conductive busbar (4); where the first direction is perpendicular to the second direction, the first direction is parallel to the lower plate and for a ratio A of a width L1 of the support structure (2) in the second direction to a length L2 of the battery cell (31) in the second direction is 0.15≤A≤0.4.

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 or accumulator device is widely used in various power-consuming devices to provide power. A battery device typically includes a housing and several battery cells arranged within the housing. A conductive busbar is usually required at one end of the battery cells, in the vertical direction, to connect them in series or parallel. The vertical direction of the battery device housing usually coincides with the vertical direction of the battery cells, and the vertical direction of the battery cells is the direction in which a terminal protrudes.

[0003] Because a terminal protrudes from one end of the battery cell in the vertical direction, and the terminals of adjacent battery cells are connected via the conductive busbar, the battery cell requires a relatively high supporting force in its vertical direction. However, if the battery cell is arranged flat in the housing, that is, if the vertical direction of the battery cell is perpendicular to the vertical direction of the housing, a conventional housing exhibits a relatively low supporting force for the battery cell in its vertical direction. SUMMARY

[0004] In view of this, the present application provides a battery device to solve the problem of the low support force of a housing for a battery cell in a vertical direction of the battery cell when the battery cell is arranged lying flat in the housing.

[0005] The present application provides a battery device comprising the following: a housing comprising a bottom plate and a surrounding frame around the bottom plate, wherein the bottom plate and the surrounding frame form a cavity; at least one support structure that is firmly connected in the cavity of the housing and divides the cavity into at least two receiving cavities; a battery pack arranged in a receiving cavity or one of the receiving cavities, wherein the battery pack comprises at least two battery cells arranged one after the other in a first direction, a terminal of the battery cell arranged in a second direction at one end of the battery cell; a protruding end face of the terminal of the battery cell arranged perpendicular to the lower plate; a conductive busbar arranged between the battery pack and the support structure and opposite the support structure, wherein both a longitudinal direction of the conductive busbar and a longitudinal direction of the support structure represent the first direction and terminals of two adjacent battery cells are connected through the conductive busbar; where the first direction is perpendicular to the second direction, the first direction is parallel to the lower plate, and for a ratio A of a width L1 of the support structure in the second direction to a length L2 of the battery cell in the second direction 0.15≤A≤0.4 applies.

[0006] Advantageous effects: A protruding end face of the battery cell terminal is arranged perpendicular to the lower plate, and the battery cell is positioned flat within the housing cavity. This arrangement requires a high degree of support for the battery cell in the second direction, which is not met by a conventional housing. In contrast, the present application provides a support structure that is rigidly connected within the housing cavity. This support structure increases the strength of the housing itself. The support structure extends in the first direction, enabling it to support at least two battery cells arranged sequentially in the first direction in the second direction. This improves the support for the battery cell.This improvement prevents a collision between the battery pack and the side of the housing, avoids a short circuit caused by insufficient support in the second direction, and mitigates the hazards posed by such a short circuit. Furthermore, the ratio A of the width L1 of the support structure in the second direction to the length L2 of the battery cell in the second direction is 0.15 ≤ A ≤ 0.4. By controlling the ratio A of the width L1 of the support structure in the second direction to the length L2 of the battery cell in the second direction, both insufficient space utilization when the ratio A is too large and insufficient support force for the battery cell in the second direction when the ratio A is too small can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] To better illustrate the technical solutions in the particular embodiments of the present application or related technology, the drawings used in the description of the particular embodiments or related technology are briefly described below. It is understood that the drawings described below represent some embodiments of the present application, and that a person skilled in the art can create other drawings based on these drawings without any creative effort. Fig. Figure 1 is a partially enlarged schematic view of a partial 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 substructure of a battery device according to an embodiment of the present application; Fig. Figure 4 is a partially enlarged schematic view of another substructure of a battery device according to an embodiment of the present application; Fig. Figure 5 is a schematic view of a support structure according to an embodiment of the present application in perspective view; Fig. Figure 6 is a schematic view of a support structure according to an embodiment of the present application in a different perspective view; and Fig. Figure 7 is a schematic view of another support structure according to an embodiment of the present application. Reference figures:

[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 tasks, technical solutions, and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application are described below in a clear and complete manner in conjunction with the drawings of the embodiments of the present application. The described embodiments are, of course, only a part of the embodiments of the present application and not all embodiments. Based on the embodiments of the present application, all other embodiments that a person skilled in the art could obtain without any creative effort fall within the scope of protection of the present application.

[0010] The embodiments of the present application are described below in conjunction with the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 described.

[0011] According to one embodiment of the present application, a battery device is provided comprising a housing 1, at least one support structure 2, a battery pack 3, and a conductive busbar 4. The housing 1 includes a bottom plate and a surrounding frame around the bottom plate, and the bottom plate and the surrounding frame form a cavity. The at least one support structure 2 is rigidly connected within the cavity of the housing 1 and divides the cavity into at least two receiving cavities; the battery pack 3 is arranged in one receiving cavity.The battery pack 3 comprises at least two battery cells 31 arranged sequentially in a first direction; a terminal of the battery cell 31 is arranged at one end of the battery cell 31 in a second direction; a protruding end face of the terminal of the battery cell 31 is arranged perpendicular to the lower plate; the conductive busbar 4 is arranged between the battery pack 3 and the support structure 2 and opposite the support structure 2. Both a longitudinal direction of the conductive busbar 4 and a longitudinal direction of the support structure 2 constitute the first direction, and terminals of two adjacent battery cells 31 are connected by the conductive busbar 4. The first direction is perpendicular to the second direction, and the first direction is parallel to the lower plate.For a ratio A of the width L1 of the support structure 2 in the second direction to a length L2 of the battery cell 31 in the second direction, 0.15≤A≤0.4 applies.

[0012] The protruding end face of the battery cell 31's terminal is arranged perpendicular to the lower plate, and the battery cell 31 lies flat within the cavity of the housing 1. The battery cell 31 has a relatively high requirement for support force in the second direction, which a conventional housing cannot meet. The support structure 2 is rigidly connected within the cavity of the housing 1, thereby increasing the strength of the housing 1 itself.Furthermore, one longitudinal direction of the support structure 2 corresponds to the first direction, such that the support structure can provide support in the second direction for at least two battery cells 31 arranged sequentially in the first direction. This improves the support force for the battery cells 31 in the second direction, prevents a collision between the battery pack 3 and a side of the housing 1, avoids a battery short circuit caused by a weak support force in the second direction, and prevents a hazard caused by a battery short circuit. Additionally, the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15 ≤ A ≤ 0.4.By controlling the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction, both insufficient space utilization with too large a ratio A and insufficient support force for the battery cell 31 in the second direction with too small a ratio A can be avoided.

[0013] In a particular embodiment, the conductive busbar 4 and the support structure 2 are arranged with a distance, and this distance is smaller than the thickness of the conductive busbar 4 in the second direction.

[0014] In particular, the second direction is a longitudinal direction of the battery cell 31 and is also a projection direction of the connection of the battery cell 31. The first direction is a longitudinal direction of the support structure 2, and the third direction is a lateral direction of the support structure 2. In a special embodiment, the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15.

[0015] In a special embodiment, the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.4.

[0016] In one embodiment, the width L1 of the support structure 2 in the second direction is in the range of 20 mm to 55 mm. In particular, the width L1 can be 20 mm or can be 55 mm.

[0017] In one embodiment, the length L2 of the battery cell 31 in the second direction is in the range of 100 mm to 150 mm. In particular, the length L2 can be 100 mm and can also be 150 mm.

[0018] In one embodiment, the support structure 2 has a hollow tubular structure and the following applies for a ratio B of the width L1 of the support structure 2 in the second direction to a thickness L3 of the support structure 2 10≤B≤41.6.

[0019] If the ratio B of the width L1 of the support structure 2 in the second direction to the thickness L3 of the support structure 2 is too large, the support structure 2 would be too thin. Consequently, the support structure 2 would exhibit low strength and poor stability. If the ratio B of the width L1 of the support structure 2 in the second direction to the thickness L3 of the support structure 2 is too small, the support structure 2 would be too thick. This results in an insufficient buffer space within the hollow interior. As a result, the support force in the second direction is poor, and an adequate buffer space is not provided.In this embodiment, since the ratio B of the width L1 of the support structure 2 in the second direction to the thickness L3 of the support structure 2 is 10≤B≤41.6, the thickness of the support structure 2 is appropriate, which ensures both that the support structure 2 itself has relatively high strength and good stability, and that the buffer space provided by the hollow interior of the support structure 2 is sufficient and that the supporting force of the support structure 2 in the second direction is relatively large.

[0020] In a particular 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 second direction to the thickness L3 of the support structure 2 is 10.

[0021] In another special 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 second direction to the thickness L3 of the support structure 2 is 41.6.

[0022] In one embodiment, the ratio C of the height H of the support structure 2 in a third direction to the width L1 of the support structure 2 in the second direction is 0.86≤C≤3.8; and the first direction, the second direction and the third direction are perpendicular to each other; and the third direction is perpendicular to the lower plate.

[0023] The ratio C of the height H of the support structure 2 in the third direction to the width L1 of the support structure 2 in the second direction can determine the supporting force of the support structure 2. If the height H of the support structure 2 in the third direction is relatively large, then the width L1 of the support structure 2 in the second direction is correspondingly increased; if the height H of the support structure 2 in the third direction is relatively small, then the width L1 of the support structure 2 in the second direction is correspondingly decreased.

[0024] In a particular embodiment, the ratio C of the height H of the support structure 2 in the third direction to the width L1 of the support structure 2 in the second direction is 0.86.

[0025] In a further particular embodiment, the ratio C of the height H of the support structure 2 in the third direction to the width L1 of the support structure 2 in the second direction is 3.8. In particular, the second direction is a longitudinal direction of the battery cell 31 and is also the projection direction of the battery cell 31 connection. The first direction is a longitudinal direction of the support structure 2, and the second direction is a lateral direction of the support structure 2. The third direction is a vertical direction of the support structure 2, and the third direction is also a vertical direction of the housing 1.

[0026] In one embodiment, the height H (that is, the dimension in the third direction, hereinafter also referred to as such) of the support structure 2 in the third direction is 43 mm≤H≤76.5 mm; and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] The height H of the support structure 2 in the third direction should not be too great, as an excessive height H of the support structure 2 would occupy too much space within the enclosure 1, which is detrimental to improved space utilization within the enclosure 1. Conversely, the height H of the support structure 2 in the third direction should not be too small, as an insufficient height H of the support structure 2 would prevent it from fulfilling its function of supporting the enclosure 1.

[0028] In a particular embodiment, the height H of the support structure 2 in the third direction is 43 mm.

[0029] In another special embodiment, the height H of the support structure 2 in the third direction is 76.5 mm.

[0030] In one embodiment, the support structure 2 comprises at least two supports that are connected successively in the third direction; and the first direction, the second direction and the third direction are perpendicular to each other.

[0031] Furthermore, at least two beams arranged separately in the third direction and connected one after the other can further increase the intrinsic strength and support force of the beam structure 2.

[0032] In particular, each support has a hollow, tubular structure.

[0033] In one embodiment, the support structure 2 comprises two supports connected sequentially in the third direction, wherein the two supports are a first support 21 and a second support 22, respectively. Both the first support 21 and the second support 22 have multiple openings 23; the number of openings 23 on the first support 21 is greater than the number of openings 23 on the second support 22, and the second support 22 is connected to the underside of the housing 1.

[0034] The openings 23 on the first beam 21 can include both openings 23 for connection and openings 23 for weight reduction. A greater number of openings 23 on the first beam 21 than the number of openings 23 on the second beam 22 can facilitate both the connection and weight reduction, as well as ensure the completeness of the second beam 22, thereby increasing the overall strength and support capacity of the beam structure 2.

[0035] In particular, the openings 23 for connection on the first support 21 have support connection openings for connecting support rings, and the support rings are used to support pipes and / or wiring. The openings 23 for connection on the first support 21 also include lifting openings for connecting lifting structures.

[0036] In a preferred embodiment, the openings 23 are provided in the third direction on both the top and bottom of the first support 21. The openings 23 are provided in the third direction on both the top and bottom of the second support 22, and the openings 23 can also be provided in the second direction on a side wall of the first support 21 and the second support 22.

[0037] Preferably, the height (i.e., the dimension in the third direction, hereinafter also) of the first support 21 in the third direction is less than the height of the second support 22 in the third direction.

[0038] In a particular embodiment, the battery cell 31 is a cylindrical battery, and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15 ≤ A ≤ 0.38. In a particular embodiment, the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction can be 0.15.

[0039] In a particular embodiment, the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction can be 0.38.

[0040] In one embodiment, the thickness L3 of the support structure 2 is 0.8 mm ≤ L3 ≤ 2 mm; and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15 ≤ A ≤ 0.38.

[0041] In a particular embodiment, the thickness L3 of the support structure 2 is 0.8 mm, and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15.

[0042] In another special embodiment, the thickness L3 of the support structure 2 is 0.8 mm, and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.38.

[0043] In another special embodiment, the thickness L3 of the support structure 2 is 2 mm, and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.15.

[0044] In yet another special embodiment, the thickness L3 of the support structure 2 is 2 mm, and the ratio A of the width L1 of the support structure 2 in the second direction to the length L2 of the battery cell 31 in the second direction is 0.38.

[0045] In one embodiment, two adjacent supports are bonded together using a structural adhesive. The joining method is therefore simple, requires little space, and the bond is strong.

[0046] In one embodiment, two adjacent supports are connected by a screw connector. This facilitates disassembly and assembly, and the connection is secure.

[0047] In one embodiment, the first support 21 is welded to the top of the housing 1, and thus the connection is relatively strong, and the overall strength of the housing 1 can be improved.

[0048] In one embodiment, the second support 22 is welded to the underside of the housing 1, and thus the connection is relatively strong, and the overall strength of the housing 1 can be improved.

[0049] In one embodiment, a cavity is provided within the second support 22, a reinforcing member 24 is provided in the cavity, and the ratio X of the thickness of the reinforcing member 24 in the third direction to the width of the second support 22 in the second direction is in the range of 1 / 25 to 1 / 14.

[0050] Providing the cavity in the second support 22 can reduce the weight of the support structure 2 and the battery device and improve the energy density; providing the reinforcing element 24 can further reinforce the second support 22, exert a supporting effect on the battery cell, and improve the overall strength of the support structure 2, thereby preventing the support structure from being subjected to excessive compression. The thickness of the reinforcing element 24 must not be too small, otherwise the supporting effect will be poor, and the thickness of the reinforcing element 24 must not be too large, otherwise the energy density of the housing would be reduced.If the ratio X of the thickness of the reinforcing element 24 in the third direction to the width of the second support 22 in the second direction is in the range of 1 / 25 to 1 / 14, the reinforcing element 24 can have a comparatively suitable thickness that can maintain a certain supporting force and does not cause the energy density of the battery to be reduced by taking up excessive space.

[0051] In a particular embodiment, the ratio X of the thickness of the reinforcing member 24 in the third direction to the width of the second support 22 in the second direction is 1 / 25.

[0052] In another special embodiment, the ratio X of the thickness of the reinforcing member 24 in the third direction to the width of the second support 22 in the second direction is 1 / 14.

[0053] In one embodiment, the battery pack 3 comprises two columns arranged sequentially in the second direction, each column comprising at least two battery cells 31 arranged sequentially in the first direction. An end of the battery cell 31 located away from the terminal in the second direction is a cooling end, with the cooling ends of the two columns of battery cells 31 being arranged opposite each other. The battery device further comprises a cooling plate 5, and the cooling plate 5 is connected between the cooling ends of the two columns of battery cells 31.

[0054] The cooling plate 5 arranged between the cooling ends of the two columns of battery cells 31 can both perform heat exchange for the battery cells 31 and provide a support function for the battery cells 31 in the second direction.

[0055] In one embodiment, the ratio Y of the thickness of the cooling plate 5 in the second direction to the width of the support structure 2 in the second direction is in the range of 1 / 20 to 1 / 14.

[0056] The cooling plate must not be too thick, otherwise the energy density of the housing would be reduced, and the cooling plate must also not be too thin, otherwise its heat exchange efficiency would be impaired. In this embodiment, therefore, a cooling plate of suitable thickness can be obtained with a ratio Y of the thickness of the cooling plate 5 in the second direction to the width of the support structure 2 in the second direction in the range of 1 / 20 to 1 / 14, which neither reduces the energy density of the housing nor impairs the heat exchange efficiency of the cooling plate.

[0057] In a particular embodiment, the ratio Y of the thickness of the cooling plate 5 in the second direction to the width of the support structure 2 in the second direction is 1 / 20.

[0058] In a particular embodiment, the ratio Y of the thickness of the cooling plate 5 in the second direction to the width of the support structure 2 in the second direction is 1 / 14.

[0059] In a particular embodiment, the support structure 2, as shown in Fig. Figure 7 shows a hollow, tubular structure and is a single structure. In particular, the support structure 2 is rolled or formed by rolling. The height H of the support structure 2 in the third direction and the thickness L3 of the support structure 2 are as shown in Figure 7. Fig. 7 shown.

[0060] In a particular embodiment, the support structure 2 comprises, as shown in Fig. 5 and Fig. 6 Two beams connected successively in the third direction, wherein the beams are a first beam 21 and a second beam 22. The thickness L3 of the beam structure 2 includes a first thickness L3 of the first beam 21 and a second thickness L3 of the second beam 22; 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, as shown in Fig. 6 is shown.

[0061] For the height H of the support structure 2 in the third direction, H = H1 + H2 applies.

[0062] The second support 22 has a hollow, tubular structure that can reduce the weight of the battery device and improve its energy density. A reinforcing element 24 is provided in the cavity, and the reinforcing element 24 can strengthen the second support 22 and increase the strength of the battery device.

[0063] In the third direction, the ratio D of the first height H1 of the first support 21 to the second height H2 of the second support 22 is 0.25 ≤ D ≤ 0.4. The second support 22 primarily serves to increase the structural strength of the battery assembly, while the first support 21 must be able to withstand the weight of the entire battery assembly during lifting. If the ratio D is too small, the structural strength of the first support 21 is insufficient, and safety risks may arise during lifting. Furthermore, since bolts must also be attached to the first support 21, an insufficient first height of the first support 21 would result in inadequate space for securing the bolts; conversely, if the ratio D is too large, the height of the first support 21 is too great, which would adversely affect the wiring routing above the first support 21.

[0064] Although the embodiments of the present application have been described in conjunction with the drawings, the person skilled in the art may make various modifications and variations without deviating from the essence 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: 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) which is firmly connected in the cavity of the housing (1) and divides the cavity into at least two receiving cavities; a battery pack (3) arranged in a receiving cavity, wherein the battery pack (3) comprises at least two battery cells (31) arranged one after the other in a first direction, a terminal of the battery cell (31) arranged in a second direction at one end of the battery cell (31); wherein a protruding end face of the terminal of the battery cell (31) is arranged perpendicular to the lower plate; a conductive busbar (4) which is arranged between the battery pack (3) and the support structure (2) and is arranged opposite the support structure (2), wherein a longitudinal direction of the support structure (2) is the first direction and the terminals of two adjacent battery cells (31) are connected by the conductive busbar (4); where the first direction is perpendicular to the second direction, the first direction is parallel to the lower plate and for a ratio A of a width L1 of the support structure (2) in the second direction to a length L2 of the battery cell (31) in the second direction is 0.15≤A≤0.

4. [2] Battery device according to claim 1, wherein the support structure (2) has a hollow tubular structure and the ratio B of the width L1 of the support structure (2) in the second direction to a thickness L3 of the support structure (2) is 10≤B≤41.

6. [3] Battery device according to claim 1 or 2, wherein the ratio C of the height H of the support structure (2) in a third direction to the width L1 of the support structure (2) in the second direction is 0.86≤C≤3.8; and wherein the first direction, the second direction and the third direction are perpendicular to each other and the third direction is perpendicular to the lower plate. [4] Battery device according to one of the preceding claims, wherein the height H of the support structure (2) in a third direction is 43 mm≤H≤76.5 mm; and wherein the first direction, the second direction and the third direction are perpendicular to each other. [5] Battery device according to any one of claims 1 to 4, wherein the support structure (2) comprises at least two supports which are successively connected in a third direction, and wherein the first direction, the second direction and the third direction are perpendicular to each other. [6] Battery device according to claim 5, wherein the support structure (2) comprises two supports which are connected successively in the third direction, the two supports being a first support (21) and a second support (22), several openings (23) are provided on both the first support (21) and the second support (22), a number of openings (23) on the first support (21) is greater than a number of openings (23) on the second support (22), the first support (21) is connected to a top of the housing (1) and the second support (22) is connected to a bottom of the housing (1). [7] Battery device according to one of the preceding claims, wherein the battery cell (31) is a cylindrical battery and the ratio A of the width L1 of the support structure (2) in the second direction to the length L2 of the battery cell (31) in the second direction is 0.15≤A≤0.

38. [8] Battery device according to one of the preceding claims, wherein for a thickness L3 of the support structure (2) 0.8 mm≤L3≤2 mm applies; for the ratio A of the width L1 of the support structure (2) in the second direction to the length L2 of the battery cell (31) in the second direction 0.15≤A≤0.38 applies. [9] Battery device according to one of the preceding claims, wherein the first support (21) is welded to the top of the housing (1). [10] Battery device according to one of the preceding claims, wherein the second support (22) is welded to the underside of the housing (1). [11] Battery device according to one of the preceding claims, wherein the second support (22) has a cavity provided therein, a reinforcing member (24) is provided in the cavity and a ratio X of a thickness of the reinforcing member (24) in the third direction to the width of the second support (22) in the second direction is in the range of 1 / 25 to 1 / 14. [12] Battery device according to one of the preceding claims, wherein the battery pack (3) comprises two columns arranged one after the other in the second direction, each column comprising at least two battery cells (31) arranged one after the other in the first direction; an end of the battery cell (31) located away from the terminal in the second direction is a cooling end, the cooling ends of the two columns of battery cells (31) are arranged opposite each other; the battery device further comprises a cooling plate (5) and the cooling plate (5) is connected between the cooling ends of the two columns of battery cells (31). [13] Battery device according to claim 12, wherein a ratio Y of a thickness of the cooling plate (5) in the second direction to the width of the support structure (2) in the second direction is in the range of 1 / 20 to 1 / 14. [14] Battery device according to one of the preceding claims, wherein the support structure (2) is rolled.

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