Battery device

Abstract

The invention provides a battery device which comprises a battery bin, the battery bin comprises a bottom plate and an enclosure frame arranged on the edge of the bottom plate, the bottom plate and the enclosure frame define a containing space used for containing a battery, the bottom plate is used for bearing the battery, and the battery bin is of a long-strip-shaped structure and has the length direction and the width direction; the ratio of the length to the width of the battery compartment is within the range of 2.1-3.5, an extension part is arranged on at least one side edge of the bottom plate, the extension part extends in the direction perpendicular to the plane where the bottom plate is located, the extension part comprises a first extension part extending along the long edge of the bottom plate and a second extension part extending along the short edge of the bottom plate, and the second extension part forms an end plate; the battery device further comprises an upper cover, the upper cover comprises a top wall and a side wall arranged on the side portion of the top wall, the side wall is used for being matched with the long edge of the bottom plate, the height of the side wall is larger than that of the first extending portion, when the upper cover is buckled on the bottom plate, the side wall and the first extending portion have an overlapping portion, and the battery device further comprises a first fastener.

Description

[0001] This application is a divisional application of the invention patent application with publication number CN118899611A. The application date of the original application is: 2024.10.09; the application number is: 202411398936.4; the name of the invention is: "Battery Device". Technical Field

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

[0003] With the development of technology, more types of vehicles have adopted new energy technologies, such as commercial trucks, vans, etc. In these long-wheelbase vehicles, a battery pack with a long strip structure is installed at the bottom of the frame. In the prior art, the battery pack includes a box body and a top cover. The box body includes a side beam. After the top cover is installed on the box body, the top surface of the side beam is connected to the top cover. Considering the size and energy density of the battery pack, the profile size of the side beam cannot be too large, resulting in a small connection area between the side beam and the top cover in the long strip battery pack (a narrow strip structure). After installation, the connection points (bolts or welding points) are subject to large external forces, and the connections are easily damaged. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art that the connection strength between the box body and the top cover of the long strip battery pack is poor after installation, thereby providing a battery device.

[0005] In order to solve the above problems, the present invention provides a battery device, including a battery compartment, the battery compartment including a bottom plate and a frame arranged at the edge of the bottom plate, the bottom plate and the frame enclose a storage space for accommodating batteries, the bottom plate is used to support the batteries, the battery compartment is a long strip structure, and has a length direction and a width direction, the ratio of the length and width of the battery compartment is in the range of 2.1 to 3.5, at least one side of the bottom plate is provided with an extension portion, the extension portion extends in a direction perpendicular to the plane where the bottom plate is located, the extension portion includes a first extension portion extending along the long side of the bottom plate, and a second extension portion extending along the short side of the bottom plate, the second extension portion forms an end plate, the battery device also includes an upper cover, the upper cover includes a top wall and a side wall arranged on the side of the top wall, the side wall is used to cooperate with the long side of the bottom plate, the height of the side wall is greater than the height of the first extension portion, when the upper cover is buckled on the bottom plate, the side wall and the first extension portion have an overlapping portion, the battery device also includes a first fastener, the first fastener is suitable for connecting the bottom plate and the upper cover, and the first fastener is connected to the overlapping portion.

[0006] The present invention has the following advantages:

[0007] By utilizing the technical solution of the present invention, the long side of the bottom plate of the battery compartment and the upper cover are connected through the overlapping area between the side wall and the first extension portion, and the connection plane is changed from a horizontal plane to a vertical plane. On the one hand, the overlapping portion occupies the horizontal space of the battery device, and the energy density of the battery device is higher. On the other hand, the overlapping portion can be set to a larger width, which increases the connection area between the side wall and the first extension portion, making the connection strength between the battery compartment and the upper cover higher. Therefore, the technical solution of the present invention solves the defect of the prior art that the connection strength between the box body and the top cover of the long strip battery pack is poor after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 A schematic diagram showing the structure of the battery device of the present invention is shown;

[0010] Figure 2 Shows Figure 1 A schematic diagram of the connection between the side wall and the floor of the middle battery device;

[0011] Figure 3 Shows Figure 1 Schematic diagram of the connection between the upper cover and the end plate of the middle battery device;

[0012] Figure 4 Shows Figure 1 A schematic diagram of the structure of the middle battery device after removing the upper cover;

[0013] Figure 5 Shows Figure 1 A schematic diagram of the structure of the bottom plate and the end plate of the middle battery device;

[0014] Figure 6 Shows Figure 1 A schematic structural diagram of the first extension portion of the middle battery device;

[0015] Figure 7 Shows Figure 1 Schematic diagram of the structure after the reinforcement beam is removed from the bottom plate of the middle battery device;

[0016] Figure 8 Shows Figure 1 A schematic diagram of the structure of the reinforcement beam of the middle battery device;

[0017] Fig. 9 Shows Figure 1A schematic diagram of the structure of the end plate of the middle battery device;

[0018] Fig.10 Shows Figure 1 A schematic diagram of the structure of adjacent batteries in a battery pack of a medium battery device;

[0019] Fig.11 Shows Figure 1 Schematic diagram of the structure of the conductive bar of the battery device.

[0020] Description of reference numerals:

[0021] 10. Battery compartment; 20. Bottom plate; 21. Fixing hole; 22. Protruding section; 30. Reinforcing beam; 31. Fixing column; 311. Connecting hole; 40. Heat exchange medium channel; 50. Extension portion; 51. First extension portion; 52. Second extension portion; 60. End plate; 61. Connecting flange; 70. Upper cover; 71. Top wall; 72. Side wall; 80. First fastener; 90. Second fastener; 100. Battery pack; 101. Battery; 1011. First surface; 1012. Second surface; 200. Conductive bar; 201. First connecting plate; 202. Second connecting plate; 203. Elastic section; 204. Arc portion; 400. Electrical compartment; 500. Output stage structure; 600. Water inlet connector; 700. Water outlet connector. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figures 1 to 9 As shown, the embodiment of the battery device according to the present application includes a battery compartment 10, which is a long strip structure and has a length direction and a width direction, and the ratio of the length to the width of the battery compartment 10 is in the range of 2.1 to 3.5. And the larger the ratio of the length to the width of the battery compartment 10, the narrower the shape of the battery compartment 10 is, and vice versa, the length of the battery compartment 10 is relatively short.

[0027] For example, the ratio of the length to the width of the battery compartment 10 may be 2.1, 2.3, 2.5, 2.7, 3 or 3.5, etc.

[0028] Furthermore, the battery compartment 10 includes a bottom plate 20, which is used to support the battery. A frame is provided at the edge of the bottom plate 20, and the bottom plate 20 and the frame together enclose a storage space for accommodating the battery. The battery device also includes a reinforcing beam 30, which is fixedly connected to the bottom plate 20, and the reinforcing beam 30 is used to connect the battery compartment 10 to the vehicle frame, and the reinforcing beam 30 is located above the vehicle frame. And the bottom plate 20 is also located above the vehicle frame.

[0029] Using the technical solution of this embodiment, a reinforcing beam 30 is provided on the bottom plate 20 of the battery compartment 10, and the reinforcing beam 30 is located above the vehicle frame, and the reinforcing beam 30 connects the battery compartment 10 to the vehicle frame. By providing the reinforcing beam 30, the vehicle frame can support the battery compartment 10 from below, preventing the bottom plate 20 from collapsing downward due to the excessive weight of the batteries in the battery compartment 10. Therefore, the technical solution of this embodiment solves the defect in the prior art that the long strip battery pack is prone to collapse in the middle after hoisting.

[0030] like Figure 5 As shown, the bottom plate 20 in this embodiment is a rectangular structure. Figure 4 For explanation in the direction shown, in the length direction of the battery compartment 10, the side of the bottom plate 20 is the long side, and in the width direction of the battery compartment 10, the side of the bottom plate 20 is the short side.

[0031] Further preferably, the ratio of the length to the width of the battery compartment 10 is in the range of 2.1 to 3.5.

[0032] In the technical solution of this embodiment, the relationship between the thickness of the bottom plate 20, the length of the battery compartment 10 and the width of the battery compartment 10 satisfies:

[0033] B / A ranges from 2.8 to 8;

[0034] Wherein, B is the thickness of the bottom plate 20 , and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0035] Specifically, the thickness of the bottom plate 20 refers to the thickness of the material of the bottom plate 20 .

[0036] The larger the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the longer the battery compartment 10 is, and therefore the heavier the battery in the battery compartment 10 is. The thickness of the bottom plate 20 needs to be appropriately increased to increase the strength and load-bearing capacity of the bottom plate 20 .

[0037] The smaller the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the smaller the battery compartment 10 is. Therefore, the weight of the battery in the battery compartment 10 is relatively light. The thickness of the bottom plate 20 can be appropriately reduced to prevent the bottom plate 20 from being too thick and occupying more space.

[0038] Optionally, the value of B / A may be 2.8, 3, 4, 5 or 8, etc.

[0039] In the technical solution of this embodiment, the relationship between the width of the reinforcing beam 30, the length of the battery compartment 10 and the width of the battery compartment 10 satisfies:

[0040] D / A ranges from 4.2 to 14.2;

[0041] Wherein, D is the width of the reinforcing beam 30 , and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0042] Specifically, the width of the reinforcement beam 30 refers to the dimension of the reinforcement beam 30 along the length direction.

[0043] The larger the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the longer the battery compartment 10 is, and therefore the heavier the battery in the battery compartment 10 is. It is necessary to appropriately increase the width of the reinforcing beam 30 to increase the strength and load-bearing capacity of the reinforcing beam 30 .

[0044] The smaller the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the smaller the battery compartment 10 is. Therefore, the weight of the battery in the battery compartment 10 is relatively light. The width of the reinforcing beam 30 can be appropriately reduced to prevent the reinforcing beam 30 from taking up too much space due to its excessive width.

[0045] Optionally, the value of D / A may be 4.2, 5, 8, 10, 14 or 14.2, etc.

[0046] like Figure 5 and Figure 6 As shown, in the technical solution of this embodiment, the reinforcing beam 30 is a cross beam, which is arranged on the surface of the bottom plate 20 facing the internal space of the battery compartment 10, and the cross beam is fixedly connected to the vehicle frame.

[0047] from Figure 5 and Figure 6 It can be seen that the reinforcing beam 30 is a long cross beam structure, which is arranged inside the battery compartment 10 and connected to the bottom plate 20 , and the cross beam extends along the width direction of the battery compartment 10 .

[0048] Optionally, since the middle of the bottom plate 20 is the location where deformation and collapse are most serious, the crossbeam is disposed in the middle of the bottom plate 20 in this embodiment.

[0049] like Figure 7 and Figure 8 As shown, in the technical solution of this embodiment, a fixing hole 21 is provided on the base plate 20, a fixing column 31 is provided on the cross beam, a connecting hole 311 is provided on the end face of the fixing column 31, the fixing column 31 passes through the connecting hole 311, and the cross beam is fixedly connected to the vehicle frame through the connecting hole 311.

[0050] Specifically, during assembly, the fixing column 31 is passed through the fixing hole 21 to fix the relative position of the crossbeam on the bottom plate 20. The crossbeam of the vehicle frame is provided with a hole, and the fixing hole is aligned with the hole on the crossbeam of the vehicle frame, and then the fastener is passed through the two to achieve the battery compartment 10 being fixed on the vehicle frame.

[0051] Optionally, a plurality of fixing holes 21 are provided, and the plurality of fixing holes 21 are arranged along the width direction of the battery compartment 10. A plurality of fixing holes are also provided on the crossbeam accordingly.

[0052] Optionally, a ratio of the width to the thickness of the beam is in the range of 1.0 to 3.7.

[0053] If the width and thickness of the crossbeam are too large, it will occupy too much space in the battery compartment 10. If the width and thickness of the crossbeam are too small, the strength of the crossbeam cannot meet the requirements. Therefore, the ratio of the width and thickness of the crossbeam should be reasonably determined while ensuring the supporting strength of the battery compartment 10.

[0054] Optionally, the ratio of the width to the thickness of the beam can be selected as 1, 1.5, 2, 2.5, 3 or 3.7, etc.

[0055] Optionally, the thickness of the beam is in the range of 13.3 mm to 23.3 mm.

[0056] For example, the thickness value of the beam can be selected as 13.3mm, 14mm, 18mm, 20mm, 23mm, or 23.3mm, etc.

[0057] like Figure 5 As shown, in the technical solution of this embodiment, a plurality of reinforcing beams 30 are provided, and the plurality of reinforcing beams 30 are arranged along the length direction of the battery compartment 10. In this embodiment, three reinforcing beams 30 are provided, and spaces for placing batteries are formed between adjacent reinforcing beams 30.

[0058] Of course, the reinforcement beams 30 may also be provided in other numbers.

[0059] Furthermore, the relationship between the spacing between adjacent reinforcing beams 30, the length of the battery compartment 10, and the width of the battery compartment 10 satisfies:

[0060] E / A ranges from 282 to 480;

[0061] Wherein, E is the distance between adjacent reinforcing beams 30 , and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0062] The larger the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the longer the battery compartment 10 is, and therefore the heavier the weight of the battery in the battery compartment 10 is. The spacing between adjacent reinforcing beams 30 is appropriately reduced to prevent the length of the bottom plate 20 between adjacent reinforcing beams 30 from being too long, which makes it impossible to guarantee the supporting effect of the battery compartment 10.

[0063] The smaller the ratio of the length of the battery compartment 10 to the width of the battery compartment 10, the smaller the battery compartment 10 is. Therefore, the weight of the battery in the battery compartment 10 is relatively light. The spacing between adjacent reinforcing beams 30 is appropriately increased to prevent too many reinforcing beams 30 from being set in the battery compartment 10 to occupy too much space and increase the weight of the battery device.

[0064] Optionally, the value of E / A can be 282, 300, 320, 350, 400, 450 or 48, etc.

[0065] Furthermore, the relationship between the number of reinforcing beams 30, the length of the battery compartment 10 and the width of the battery compartment 10 satisfies: F / A is in the range of 0.85 to 1.4; wherein F is the number of reinforcing beams 30, and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10.

[0066] The larger the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the longer the battery compartment 10 is. Therefore, the heavier the weight of the battery in the battery compartment 10 is, and more reinforcing beams 30 are needed to ensure the supporting effect of the battery compartment 10.

[0067] The smaller the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the smaller the battery compartment 10 is. Therefore, the weight of the battery in the battery compartment 10 is relatively light. In this case, a smaller number of reinforcing beams 30 are sufficient.

[0068] Optionally, the value of F / A may be 0.85, 0.9, 1, 1.1 or 1.4, etc.

[0069] like Fig. 9 As shown, in the technical solution of this embodiment, a heat exchange medium channel 40 is provided in the bottom plate 20. The heat exchange medium can flow in the heat exchange medium channel 40 and exchange heat for the battery. That is, the bottom plate 20 of this embodiment also serves as a cold plate, thereby simplifying the structure and occupied space of the battery device.

[0070] Of course, in some embodiments not shown, a cold plate may be provided separately, that is, the bottom plate 20 does not serve as a cold plate.

[0071] Furthermore, when the bottom plate 20 also serves as a cold plate, the relationship between the thickness of the bottom plate 20, the length of the battery compartment 10, and the width of the battery compartment 10 satisfies:

[0072] B / A ranges from 2.85 to 8;

[0073] Wherein, B is the thickness of the bottom plate 20 , and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0074] Specifically, when the bottom plate 40 is also used as a cold plate, a heat exchange medium channel 40 is also provided in the bottom plate 40, so the thickness of the bottom plate 40 needs to be appropriately increased to ensure the heat exchange effect on the battery 101 and the structural strength of the bottom plate 40. Correspondingly, the value of B / A can be appropriately increased.

[0075] Optionally, when the base plate 20 also serves as a cold plate, B / A may take values ​​of 2.85, 3, 3.5, 4 or 8, etc.

[0076] like Figure 3 and Figure 6 As shown, in the technical solution of this embodiment, an extension portion 50 is provided on at least one side of the bottom plate 20, and the extension portion 50 extends in a direction perpendicular to the plane where the bottom plate 20 is located. The extension portion 50 is used to connect with the upper cover 70 of the battery device.

[0077] Those skilled in the art will appreciate that the extension portion 50 forms the aforementioned surrounding frame.

[0078] like Figure 6 As shown, in the technical solution of this embodiment, the extension portion 50 includes a first extension portion 51 extending along the long side of the bottom plate 20 .

[0079] Specifically, the first extension portion 51 extends along the length direction of the battery compartment 10. The first extension portion is disposed on both long sides of the bottom plate 20.

[0080] In the technical solution of this embodiment, the ratio of the thickness of the first extension portion 51 to the length of the battery compartment 10 is in the range of 0.06% to 0.15%.

[0081] It should be noted that the thickness of the first extending portion 51 refers to the thickness of the profile of the first extending portion 51 .

[0082] Furthermore, the thickness of the first extension portion 51 should not be too large. If the thickness of the first extension portion 51 is too large, the weight of the battery device will increase, and the space in the battery compartment 10 will be occupied. Furthermore, the thickness of the first extension portion 51 should not be too small. If the thickness of the first extension portion 51 is too small, the strength of the first extension portion 51 is too small, and the connection strength between the bottom plate 20 and the upper cover 70 cannot be met.

[0083] Optionally, the ratio of the thickness of the first extension portion 51 to the length of the battery compartment 10 may be 0.06%, 0.07%, 0.08%, 0.1%, 0.12% or 0.15%, etc.

[0084] In the technical solution of this embodiment, the ratio of the height of the first extension portion 51 to the length of the battery compartment 10 is in the range of 0.35% to 1.0%.

[0085] It should be noted that the height of the first extension portion 51 refers to the height of the first extension portion 51. Figure 4 The size of the first extension portion 51 in the up-down direction (perpendicular to the length and width directions of the battery compartment 10 ).

[0086] Furthermore, the height of the first extension portion 51 should not be too large, because if the thickness of the first extension portion 51 is too large, the weight of the battery device will increase. Furthermore, the thickness of the first extension portion 51 should not be too small, because if the height of the first extension portion 51 is too small, the strength of the first extension portion 51 is too small, and the connection strength between the bottom plate 20 and the upper cover 70 cannot be met.

[0087] Optionally, the ratio of the height of the first extension portion 51 to the length of the battery compartment 10 may be 0.35%, 0.4%, 0.5%, 0.7% or 1.0%.

[0088] like Figure 3 , Figure 4 , Figure 5 and Fig. 9 As shown, in the technical solution of this embodiment, the extension portion 50 includes a second extension portion 52 extending along the short side of the bottom plate 20 , and the second extension portion 52 forms an end plate 60 .

[0089] Specifically, the two short sides of the bottom plate 20 are each provided with an end plate 60. The end plate 60 forms the front and rear surfaces of the battery device and is used to connect with the upper cover 70.

[0090] In this embodiment, the upper cover 70 is directly connected to the end plate 60. In some embodiments not shown, a third extension portion may be provided on the side (i.e., the short side) of the upper cover 70 corresponding to the bottom plate 20, and the upper end of the end plate 60 is matched with the lower end of the third extension portion. In this embodiment, the height of the end plate 60 is greater than the height of the third extension portion.

[0091] Optionally, a ratio of the height of the end plate 60 to the height of the third extension portion is in a range of 13.5 to 14.5.

[0092] For example, the ratio of the height of the end plate 60 to the height of the third extension portion may be selected as 13.5, 13.7, 13.9, 14, 14.2 or 14.5, etc.

[0093] like Fig. 9 As shown, in the technical solution of this embodiment, a connecting flange 61 is provided at the edge of the end plate 60 , and the connecting flange 61 is vertically arranged with the end plate 60 .

[0094] Specifically, connecting flanges 61 are provided on the top edge and two side edges of the end plate 60. When the upper cover 70 is placed on the base plate 20, the edge of the upper cover 70 fits with the connecting flanges 61, so the upper cover 70 can be connected to the connecting flanges 61 through fasteners.

[0095] Those skilled in the art will appreciate that the cross-sections of the end plate 60 and the connecting flange 61 may be formed in a “T”-shaped structure or in an inverted “L”-shaped structure.

[0096] In the technical solution of this embodiment, the ratio of the width of the connecting flange 61 to the thickness of the end plate 60 is in the range of 5 to 8.

[0097] It should be noted that the width of the connecting flange 61 refers to the dimension of the connecting flange 61 along the length direction of the battery compartment 10 .

[0098] Specifically, the ratio of the width of the connecting flange 61 to the thickness of the end plate 60 should not be too large. If the ratio is too large, the overall strength of the battery device will be affected.

[0099] Optionally, the ratio of the width of the connecting flange 61 to the thickness of the end plate 60 may be selected as 5, 6, 7 or 8, etc.

[0100] In the technical solution of this embodiment, the distance from the outer edge of the connecting flange 61 to the outer surface of the end plate 60 is in the range of 17 mm to 22 mm.

[0101] Specifically, the distance from the outer edge of the connecting flange 61 to the outer surface of the end plate 60 should not be too large or too small. If the distance is too large, the space occupied by the connecting flange 61 will be increased, and if the distance is too small, the strength of the connecting flange 61 will be reduced, and the fastener will be easily crushed when subjected to external force.

[0102] Optionally, the distance from the outer edge of the connecting flange 61 to the outer surface of the end plate 60 can be selected as 17 mm, 18 mm, 19 mm, 20 mm, 21 mm or 22 mm, etc.

[0103] In the technical solution of this embodiment, the distance from the inner edge of the connecting flange 61 to the inner surface of the end plate 60 is in the range of 3 mm to 14 mm.

[0104] Specifically, the distance from the inner edge of the connecting flange 61 to the inner surface of the end plate 60 should not be too large or too small. If the distance is too large, the space occupied by the connecting flange 61 will increase, and if the distance is too small, the strength of the connecting flange 61 will be reduced, and the connecting flange 61 will be easily crushed when the fastener is subjected to external force.

[0105] Optionally, the distance from the inner edge of the connecting flange 61 to the inner surface of the end plate 60 can be selected to be 3 mm, 5 mm, 7 mm, 9 mm, 11 mm or 14 mm, etc.

[0106] like Figures 1 to 3 As shown, in the technical solution of this embodiment, the battery device further includes an upper cover 70, and the ratio of the thickness of the upper cover 70 to the thickness of the bottom plate 20 is in the range of 0.04 to 0.1.

[0107] It should be noted that the thickness of the upper cover 70 refers to the thickness of the profile of the upper cover 70 .

[0108] Specifically, in order to ensure the stability of the battery device, the thickness of the upper cover 70 should be smaller than the thickness of the bottom plate 20 .

[0109] Optionally, the ratio of the thickness of the upper cover 70 to the thickness of the bottom plate 20 may be 0.04, 0.05, 0.06, 0.08 or 1, etc.

[0110] like Figure 1 As shown, in the technical solution of this embodiment, the upper cover 70 includes a top wall 71 and a side wall 72 arranged on the side of the top wall 71, and the side wall 72 is used to cooperate with the long side of the bottom plate 20, and the height of the side wall 72 is greater than the height of the first extension portion 51.

[0111] Specifically, the cross section of the upper cover 70 is formed into a generally "U"-shaped structure. The lower end of the side wall 72 cooperates with the first extension portion 51 and is connected by fasteners. The front and rear edges of the upper cover 70 cooperate with the above-mentioned connecting flange 61 and are connected by fasteners.

[0112] By making the height of the side wall 72 greater than the height of the first extension portion 51 , the overall weight of the bottom plate 20 can be reduced.

[0113] In the technical solution of this embodiment, the ratio of the height of the side wall 72 to the height of the first extension portion 51 is in the range of 8 to 30.

[0114] Specifically, the height of the first extension portion 51 should be moderate, and the weight of the bottom plate 20 should be reduced as much as possible while ensuring the structural strength of the bottom plate 20 .

[0115] Optionally, the ratio of the height of the side wall 72 to the height of the first extension portion 51 may be 8, 10, 12, 15, 20, 30, or the like.

[0116] like Figure 1 and Figure 6 As shown, in the technical solution of this embodiment, when the upper cover 70 is buckled onto the bottom plate 20 , the side wall 72 and the first extension portion 51 have an overlapping portion.

[0117] Specifically, when the upper cover 70 is buckled onto the bottom plate 20, the lower end of the side wall 72 covers at least a portion of the first extension portion 51, so that the side wall 72 and the first extension portion 51 form an overlapping portion. The overlapping portion is convenient for setting fasteners connecting the upper cover 70 and the bottom plate 20.

[0118] In the technical solution of this embodiment, the battery device further includes a first fastener 80, which is suitable for connecting the bottom plate 20 and the upper cover 70, and the first fastener 80 is connected to the overlapping portion.

[0119] Specifically, a connecting hole is provided at the lower end of the side wall 72, and a connecting hole is also provided on the first extension portion 51. During assembly, the connecting hole on the side wall 72 is aligned with the connecting hole on the first extension portion 51, and the first fastener 80 passes through the two connecting holes to realize the connection between the upper cover 70 and the bottom plate 20 on the long side.

[0120] Optionally, the first fastener 80 includes a first bolt.

[0121] In the technical solution of this embodiment, the distance from the first fastener 80 to the lower edge of the side wall 72 is in the range of 1 mm to 3 mm.

[0122] Specifically, the distance from the first fastener 80 to the lower edge of the side wall 72 should not be too small. If the distance is too small, the first fastener 80 will easily crush the lower edge of the side wall 72 when subjected to external force.

[0123] Optionally, the distance from the first fastener 80 to the lower edge of the side wall 72 may be 1 mm, 2 mm, 3 mm, or the like.

[0124] In the technical solution of this embodiment, the distance from the first fastener 80 to the upper edge of the first extending portion 51 is in the range of 12 mm to 22 mm.

[0125] Specifically, the distance from the first fastener 80 to the upper edge of the first extension portion 51 should not be too small. If the distance is too small, the first fastener 80 may easily crush the upper edge of the first extension portion 51 when subjected to external force.

[0126] Optionally, the distance from the first fastener 80 to the upper edge of the first extending portion 51 may be selected to be 12 mm, 14 mm, 16 mm, 19 mm, or 22 mm, etc.

[0127] In the technical solution of this embodiment, the ratio of the diameter of the first bolt to the height of the first extending portion 51 is in the range of 0.25 to 0.6.

[0128] Specifically, when the height of the first extending portion 51 is relatively small, the diameter of the first bolt may be appropriately reduced, and when the height of the first extending portion 51 is relatively large, the diameter of the first bolt may be appropriately increased.

[0129] Optionally, the ratio of the diameter of the first bolt to the height of the first extension portion 51 may be selected as 0.25, 0.3, 0.35, 0.4, 0.5 or 0.6.

[0130] In the technical solution of this embodiment, the battery device further includes a first sealing ring, which is sandwiched between the side wall 72 and the first extension portion 51 and surrounds the first bolt. The first sealing ring can ensure the sealing performance between the side wall 72 and the first extension portion 51.

[0131] In the technical solution of this embodiment, the ratio of the distance between the first bolt and the first sealing ring to the distance between the first bolt and the lower edge of the side wall 72 is in the range of 1.6 to 2.6.

[0132] Specifically, "the distance between the first bolt and the first sealing ring" refers to the distance between the outer surface of the first bolt and the outer surface of the first sealing ring after the first sealing ring is compressed after assembly, that is, the radial width of the first sealing ring after compression.

[0133] Optionally, the distance between the first bolt and the first sealing ring, and the distance between the first bolt and the lower edge of the side wall 72 can be selected as 1.6, 1.8, 2, 2.2, 2.4 or 2.6.

[0134] like Figure 1 and Figure 3 As shown, in the technical solution of this embodiment, a second fastener 90 is provided between the upper cover 70 and the connecting flange 61 , and the second fastener 90 includes a second bolt.

[0135] Specifically, the edge of the upper cover 70 is provided with connection holes, and the connecting flange 61 is also provided with connection holes. During assembly, the connection holes on the edge of the upper cover 70 are aligned with the connection holes of the connecting flange 61, and the second fastener 90 passes through the two connection holes to achieve the connection between the upper cover 70 and the end plate.

[0136] Optionally, a plurality of second bolts are arranged at intervals, and the plurality of second bolts are arranged at intervals along the contour of the connection between the upper cover 70 and the end plate 60 , thereby ensuring the connection strength between the upper cover 70 and the end plate 60 .

[0137] Optionally, the distance between adjacent second bolts is in the range of 70 mm to 120 mm.

[0138] For example, the distance between adjacent second bolts may be selected as 70 mm, 80 mm, 90 mm, 100 mm, 110 mm or 120 mm, etc.

[0139] In the technical solution of this embodiment, the ratio of the diameter of the second bolt to the distance between adjacent second bolts is in the range of 0.04 to 0.07.

[0140] Specifically, in this embodiment, the larger the diameter of the second bolt is, the smaller the distance between adjacent second bolts is. The smaller the diameter of the second bolt is, the larger the distance between adjacent second bolts is.

[0141] Optionally, the ratio of the diameter of the second bolt to the distance between adjacent second bolts can be selected as 0.04, 0.05, 0.06 or 0.07, etc.

[0142] In the technical solution of this embodiment, the battery device further includes a second sealing ring, which is sandwiched between the upper cover 70 and the connecting flange 61 and surrounds the second bolt. Specifically, the second sealing ring can ensure the sealing performance between the upper cover 70 and the connecting flange 61.

[0143] Furthermore, the diameter of the second bolt, the distance between adjacent second bolts and the width of the second sealing ring satisfy:

[0144] G / H ranges from 328 to 575;

[0145] Wherein, G is the ratio of the diameter of the second bolt to the distance between adjacent second bolts, and H is the width of the second sealing ring.

[0146] It should be noted that the width of the second sealing ring refers to the distance from the inner surface to the outer surface of the compressed second sealing ring.

[0147] Furthermore, when the ratio of the diameter of the second bolt to the distance between adjacent second bolts is larger, the width of the second sealing ring is required to be larger, thereby ensuring the sealing performance. Conversely, when the ratio of the diameter of the second bolt to the distance between adjacent second bolts is smaller, the width of the second sealing ring can be appropriately reduced.

[0148] Optionally, the value of G / H can be 328, 350, 370, 390, 450, 475, 500 or 575, etc.

[0149] In the technical solution of this embodiment, the distance between the second bolt and the outer edge of the connecting flange 61 is in the range of 7 mm to 10 mm.

[0150] Specifically, the distance from the second bolt to the outer edge of the connecting flange 61 should not be too small. If the distance is too small, the outer edge of the connecting flange 61 may be easily crushed when the second bolt is subjected to external force.

[0151] Optionally, the distance between the second bolt and the outer edge of the connecting flange 61 may be 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0152] In the technical solution of this embodiment, the distance between the second bolt and the inner edge of the connecting flange 61 is in the range of 11 mm to 18 mm.

[0153] Specifically, the distance from the second bolt to the inner edge of the connecting flange 61 should not be too small. If the distance is too small, the inner edge of the connecting flange 61 may be easily crushed when the second bolt is subjected to external force.

[0154] Optionally, the distance between the second bolt and the inner edge of the connecting flange 61 may be 11 mm, 13 mm, 15 mm, 17 mm, 18 mm, etc.

[0155] Optionally, the material of the base plate 20 includes aluminum alloy 6061-T6\6063-T6.

[0156] Optionally, the material of the upper cover 70 includes cold-rolled steel plate or composite material.

[0157] Furthermore, since the upper cover 70 has a larger area, the strength of the upper cover 70 is greater than the strength of the bottom plate 20 .

[0158] Optionally, the tensile strength of the upper cover 70 is greater than or equal to 230 MPa. The tensile strength of the bottom plate 20 is greater than or equal to 240 MPa.

[0159] like Figure 4 , Fig.10 and Fig.11 As shown, in the technical solution of this embodiment, a battery pack 100 is arranged in the battery compartment, and the battery pack 100 includes a plurality of batteries 101, and adjacent batteries 101 are connected by a conductive bar 200, wherein the ratio of the width of the conductive bar 200 to the length of the battery compartment 10 is in the range of 4.4% to 5.3%.

[0160] It should be noted that the width of the conductive bar 200 refers to the dimension of the conductive bar 200 along the width direction of the battery compartment 10 .

[0161] Specifically, the conductive bar 200 is used to connect the poles of adjacent batteries 101. The longer the battery compartment 10 is, the more batteries 101 there are in the battery compartment 10, and the greater the current during operation, so the conductive bar 200 needs to have a larger width so that the conductive bar 200 has a higher current capacity.

[0162] Optionally, the ratio of the width of the conductive bar 200 to the length of the battery compartment 10 may be selected as 4.4%, 4.6%, 4.8%, 5% or 5.3%, etc.

[0163] In the technical solution of this embodiment, the ratio of the thickness of the conductive bar 200 to the length of the battery compartment 10 is in the range of 0.08% to 0.1%.

[0164] As described above, the longer the battery compartment 10 is, the more batteries 101 there are in the battery compartment 10 , and the greater the current during operation. Therefore, the conductive bar 200 needs to have a greater thickness so that the conductive bar 200 has a higher current carrying capacity.

[0165] Optionally, the ratio of the thickness of the conductive bar 200 to the length of the battery compartment 10 may be selected as 0.08%, 0.09% or 0.1%.

[0166] like Fig.11 As shown, in the technical solution of this embodiment, the conductive bar 200 includes a first connecting piece 201, a second connecting piece 202 and an elastic section 203. The first connecting piece 201 and the second connecting piece 202 are respectively used to connect to the poles of the adjacent battery 101, the elastic section 203 is connected between the first connecting piece 201 and the second connecting piece 202, and the elastic section 203 includes an arc portion 204. When the conductive bar 200 vibrates, the first connecting piece 201 and the second connecting piece 202 can deflect around the arc portion.

[0167] Specifically, the first connecting piece 201 and the second connecting piece 202 are both square pieces, and are used to connect to the poles of the adjacent batteries 101 .

[0168] from Fig.11It can be seen that the cross section of the arc portion 204 of the elastic segment 203 is an arc-shaped structure, and the first connecting piece 201 and the second connecting piece 202 can deflect around the arc portion. Therefore, when the battery device vibrates, the first connecting piece 201 and the second connecting piece 202 can be buffered to prevent the first connecting piece 201 and the second connecting piece 202 from being damaged and falling off from the pole.

[0169] In the technical solution of this embodiment, the ratio of the surface area of ​​the elastic segment 203 to the length of the battery compartment 10 is in the range of 2.6% to 5.3%.

[0170] Specifically, the longer the battery compartment 10 is, the greater the vibration amplitude of the battery device will be. Therefore, the surface area of ​​the elastic section 203 should be appropriately increased to increase the buffering effect on the first connecting piece 201 and the second connecting piece 202 .

[0171] Optionally, the ratio of the surface area of ​​the elastic segment 203 to the length of the battery compartment 10 can be selected as 2.6%, 2.8%, 3%, 4%, 5%, 5.3%, etc.

[0172] like Fig. 9 As shown, in the technical solution of this embodiment, there are multiple groups of heat exchange medium channels 40, and the multiple groups of heat exchange medium channels 40 are spaced apart along the width direction of the battery compartment 10.

[0173] The relationship between the wall thickness of the heat exchange medium channels 40 of adjacent groups, the length of the battery compartment 10 and the width of the battery compartment 10 satisfies:

[0174] I / A ranged from 0.57 to 0.95;

[0175] Wherein, I is the wall thickness between adjacent groups of heat exchange medium channels 40 , and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0176] from Fig. 9 It can be seen that the wall thickness of the bottom plate 20 between adjacent heat exchange medium channels 40 is relatively thick, and this portion is used to cooperate with the fasteners connecting the reinforcing beam 30, so as to ensure the connection strength between the reinforcing beam 30 and the bottom plate.

[0177] The larger the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 is, the longer the battery compartment 10 is, and therefore the heavier the weight of the battery in the battery compartment 10 is. It is necessary to appropriately increase the wall thickness between adjacent groups of heat exchange medium channels 40 to increase the supporting strength of the base plate 20 and the connection strength between the strengthening beam 30 and the base plate 20.

[0178] The smaller the ratio of the length of the battery compartment 10 to the width of the battery compartment 10, the smaller the battery compartment 10 is. Therefore, the weight of the battery in the battery compartment 10 is relatively light. The wall thickness between adjacent groups of heat exchange medium channels 40 can be appropriately reduced, thereby reducing the size of the bottom plate 20.

[0179] Optional, the value of I / A can be 0.57, 0.6, 0.7, 0.8, 0.9 or 0.95, etc.

[0180] In the technical solution of this embodiment, the reinforcing beam 30 is connected to the base plate 20 via a third fastener, the third fastener comprises a third bolt, and the connection position of the third bolt on the base plate 20 is located between adjacent groups of heat exchange medium channels 40 .

[0181] Specifically, the third bolt passes through the connection hole of the crossbeam of the vehicle frame and is tightened into the connection hole 311. That is, the fixing hole 21 is provided on the bottom plate 20 between adjacent groups of heat exchange medium channels 40, thereby ensuring the connection strength between the third bolt and the bottom plate 20.

[0182] In the technical solution of this embodiment, the relationship between the fastening area of ​​the third bolt, the length of the battery compartment 10 and the width of the battery compartment 10 satisfies:

[0183] J / A ranges from 129 to 215;

[0184] Wherein, J is the fastening area of ​​the third bolt, and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10 .

[0185] Specifically, the ratio should not be too large, otherwise it will be detrimental to the sealing of the bottom plate 20, the reinforcing beam 30 and the vehicle frame. The ratio should not be too small, otherwise the locking pressure of the third bolt will be too large, which may easily cause component damage.

[0186] Optionally, J / A can take the value of 129, 130, 150, 180, 200, 210 or 215, etc.

[0187] like Figure 4 As shown, in the technical solution of this embodiment, the battery device also includes an electrical compartment 400, which is used to place electrical components. The electrical compartment 400 is located on one side of the wide side of the battery compartment 10.

[0188] Such an arrangement can improve the overall utilization rate of the internal space of the battery device.

[0189] In the technical solution of this embodiment, the ratio of the length of the electrical compartment 400 to the length of the battery compartment 10 is in the range of 2.6% to 5.3%.

[0190] Specifically, in order to ensure the reasonable use of the space inside the battery device, the ratio of the length of the electrical compartment 400 to the length of the battery compartment 10 should not be too large. If the ratio is too large, the overall weight of the battery device will be unbalanced. The ratio of the length of the electrical compartment 400 to the length of the battery compartment 10 should not be too small. If the ratio is too small, the space in the electrical compartment 400 will be too small, and the electrical components cannot be reasonably arranged, and the electrical components will be too crowded. The risk of heating of the electrical components and even safety accidents during use is increased.

[0191] Optionally, the ratio of the length of the electrical compartment 400 to the length of the battery compartment 10 can be selected as 2.6%, 3%, 3.5%, 4%, 4.5%, 5% or 5.3%, etc.

[0192] like Figure 1 , Figure 3 and Fig. 9 As shown, in the technical solution of this embodiment, an output stage structure 500 is arranged on the outer side of the end plate 60, and the output stage structure 500 is connected to the electrical components in the electrical compartment 400. And the output stage structure 500 is arranged in two opposite positions, one of which is a positive output pole and the other is a negative output pole.

[0193] Furthermore, the battery device also includes a water inlet connector 600 and a water outlet connector 700, both of which are connected to the heat exchange medium channel 40, and the heat exchange medium (coolant) can enter the heat exchange medium channel 40 from the water inlet connector 600, and the heat exchange medium can be discharged from the water outlet connector 700.

[0194] In this embodiment, the output stage structure 500, the water inlet connector 600 and the water outlet connector 700 are located on the same side of the electrical compartment 400, which optimizes the arrangement of the three and improves space utilization.

[0195] like Figure 1 and Fig. 9 As shown, in the technical solution of this embodiment, the wide edge of the bottom plate 20 protrudes from the end plate 60, and the part of the bottom plate 20 protruding from the end plate 60 forms a protruding section 22, and the water inlet joint 600 and the water outlet joint 700 are arranged on the protruding section 22.

[0196] In this embodiment, by providing the protruding section 22 , the output stage structure 500 , the water inlet connector 600 and the water outlet connector 700 can be prevented from protruding from the side of the battery device, thereby optimizing the arrangement positions of the three.

[0197] In the technical solution of this embodiment, the ratio of the length of the protruding section 22 to the sum of the lengths of the battery compartment 10 and the electrical compartment 400 is in the range of 2% to 3%.

[0198] Specifically, the ratio of the length of the protruding section 22 to the sum of the lengths of the battery compartment 10 and the electrical compartment 400 should not be too small. If the ratio is too small, the sealing performance of the water inlet connector 600 and the water outlet connector 700 cannot be guaranteed. The ratio of the length of the protruding section 22 to the sum of the lengths of the battery compartment 10 and the electrical compartment 400 should not be too large. If the ratio is too large, too much space in the battery compartment 10 is occupied, reducing the capacity of the battery device.

[0199] Optionally, the ratio of the length of the protruding section 22 to the sum of the lengths of the battery compartment 10 and the electrical compartment 400 may be selected as 2%, 2.5% or 3%.

[0200] like Figure 4 and Fig.10 As shown, in the technical solution of this embodiment, a battery pack 100 is placed in the battery compartment 10, and the ratio of the projected length of the battery pack 100 to the length of the battery compartment 10 is in the range of 13.5 to 22.6.

[0201] Specifically, the ratio of the projected length of the battery pack 100 to the length of the battery compartment 10 should not be too small. If the ratio is too small, the space utilization and energy density of the battery compartment 10 will be too low. The ratio of the projected length of the battery pack 100 to the length of the battery compartment 10 should not be too large. If the ratio is too large, the installation space and exhaust space of the battery pack 100 cannot be met.

[0202] Optionally, the ratio of the projected length of the battery pack 100 to the length of the battery compartment 10 can be selected as 13.5, 14, 16, 18, 20 or 22.6, etc.

[0203] like Figure 4 and Fig.10 As shown, in the technical solution of this embodiment, the battery pack 100 includes a battery 101, and the battery 101 includes two first surfaces 1011 arranged opposite to each other along the length direction of the battery compartment 10, and the ratio of the distance between the inner walls of the two first surfaces 1011 to the length of the battery compartment 10 is in the range of 0 to 0.06% (the ratio is greater than 0).

[0204] Specifically, the first surface 1011 is a large surface of the battery 101 , and the distance between the inner walls of the two first surfaces 1011 is the distance between the two large surfaces in the inner cavity of the shell of the battery 101 .

[0205] Furthermore, the ratio of the distance between the inner walls of the two first surfaces 1011 to the length of the battery compartment 10 needs to take into account the energy density of the battery 101 and the expansion during use.

[0206] Optionally, the ratio of the distance between the inner walls of the two first surfaces 1011 to the length of the battery compartment 10 can be selected as 0.01%, 0.02%, 0.03%, 0.04%, 0.05% or 0.06%.

[0207] like Figure 4 and Fig.10 As shown, in the technical solution of this embodiment, the battery pack 100 includes a plurality of batteries 101, and the plurality of batteries 101 are arranged at intervals along the length direction of the battery compartment 10, and battery cells are arranged in the battery 101. In a battery pack 100, the ratio of the distance between the battery cells of two batteries 101 located at the end to the length of the battery compartment 10 is in the range of 2.57% to 2.6%.

[0208] Furthermore, the ratio of the distance between the cells of two batteries 101 located at the ends of a battery pack 100 to the length of the battery compartment 10 needs to take into account the energy density of the battery 101 and the expansion during use.

[0209] Optionally, in each battery pack 100, the ratio of the distance between the cells of two batteries 101 located at the end to the length of the battery compartment 10 can be selected as 2.57%, 2.58%, 2.59% or 2.6%, etc.

[0210] like Figure 4 and Fig.10 As shown, in the technical solution of this embodiment, the battery pack 100 includes a battery 101, and the battery 101 includes two second surfaces 1012 arranged opposite to each other along the width direction of the battery compartment 10, and the ratio of the distance between the inner walls of the two second surfaces 1012 to the width of the battery compartment 10 is in the range of 0.155% to 0.157%.

[0211] Specifically, the second surface 1012 is a small surface of the battery 101 , and the distance between the inner walls of the two second surfaces 1012 is the distance between the two large surfaces in the inner cavity of the shell of the battery 101 .

[0212] Furthermore, the ratio of the distance between the inner walls of the two second surfaces 1012 to the length of the battery compartment 10 needs to take into account the energy density of the battery 101 and the expansion during use.

[0213] Optionally, the ratio of the distance between the inner walls of the two second surfaces 1012 to the width of the battery compartment 10 can be selected as 0.155%, 0.156% or 0.157%, etc.

[0214] Furthermore, the battery 101 may adopt different battery structures.

[0215] In this embodiment, the battery 101 is a square battery, the battery pack 100 includes a plurality of square batteries, and the plurality of square batteries are arranged along the length direction of the battery compartment 10 . There are a plurality of battery packs 100 , and the plurality of battery packs 100 are arranged along the width direction of the battery compartment 10 .

[0216] In some embodiments not shown, the battery 101 may also be a long strip structure.

[0217] Specifically, the battery 101 extends along the width direction of the battery compartment 10, and there are multiple batteries 101, and the multiple batteries 101 are arranged along the length direction of the battery compartment 10, wherein the surface of the battery 101 includes two opposite first surfaces and four second surfaces arranged around the first surface, the area of ​​the first surface is larger than the area of ​​the second surface, a pole assembly is arranged on the first surface, and the length direction of the second surface extends along the width direction of the battery compartment 10.

[0218] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery device, characterized in that: The battery compartment (10) comprises a bottom plate (20) and a surrounding frame arranged at the edge of the bottom plate (20), the bottom plate (20) and the surrounding frame enclosing a storage space for storing a battery (101), the bottom plate (20) being used to support the battery (101), the battery compartment (10) being a long strip structure and having a length direction and a width direction, the ratio of the length to the width of the battery compartment (10) being in the range of 2.1 to 3.5, An extension portion (50) is provided on at least one side of the bottom plate (20), the extension portion (50) extending in a direction perpendicular to a plane on which the bottom plate (20) is located, the extension portion (50) comprising a first extension portion (51) extending along a long side of the bottom plate (20), and a second extension portion (52) extending along a short side of the bottom plate (20), the second extension portion (52) forming an end plate (60), The battery device further comprises an upper cover (70), the upper cover (70) comprising a top wall (71) and a side wall (72) arranged on the side of the top wall (71), the side wall (72) being used to cooperate with the long side of the bottom plate (20), the height of the side wall (72) being greater than the height of the first extension portion (51), When the upper cover (70) is buckled onto the bottom plate (20), the side wall (72) and the first extension portion (51) have an overlapping portion. The battery device further comprises a first fastener (80), wherein the first fastener (80) is adapted to connect the bottom plate (20) and the upper cover (70), and the first fastener (80) is connected to the overlapping portion.

2. The battery device according to claim 1, characterized in that: The ratio of the length to the width of the battery compartment (10) is in the range of 2.1 to 3.

5.

3. The battery device according to claim 1, characterized in that: The relationship between the thickness of the bottom plate (20), the length of the battery compartment (10) and the width of the battery compartment (10) satisfies: B / A ranges from 2.8 to 8; Wherein, B is the thickness of the bottom plate (20), and A is the ratio of the length of the battery compartment (10) to the width of the battery compartment (10).

4. The battery device according to any one of claims 1 to 3, characterized in that: A heat exchange medium channel (40) is provided in the bottom plate (20).

5. The battery device according to claim 4, characterized in that: The relationship between the thickness of the bottom plate (20), the length of the battery compartment (10) and the width of the battery compartment (10) satisfies: B / A ranges from 2.85 to 8; Wherein, B is the thickness of the bottom plate (20), and A is the ratio of the length of the battery compartment (10) to the width of the battery compartment (10).

6. The battery device according to claim 1, characterized in that: The ratio of the thickness of the first extension portion (51) to the length of the battery compartment (10) is in the range of 0.06% to 0.15%.

7. The battery device according to claim 1, characterized in that: The ratio of the height of the first extension portion (51) to the length of the battery compartment (10) is in the range of 0.35% to 1.0%.

8. The battery device according to claim 1, characterized in that: The end plates (60) are arranged on both short sides of the bottom plate (20).

9. The battery device according to claim 1, characterized in that: The battery device also includes an upper cover (70), which is buckled onto the base plate (20), and a third extension portion is provided on the side of the upper cover (70) corresponding to the base plate (20), the upper end of the end plate (60) cooperates with the lower end of the third extension portion, and the height of the end plate (60) is greater than the height of the third extension portion.

10. The battery device according to claim 9, characterized in that: A ratio of a height of the end plate (60) to a height of the third extension portion is in a range of 13.5 to 14.

5.

11. The battery device according to claim 1, characterized in that: A connecting flange (61) is arranged at the edge of the end plate (60), and the connecting flange (61) is arranged perpendicular to the end plate (60).

12. The battery device according to claim 11, characterized in that: The ratio of the width of the connecting flange (61) to the thickness of the end plate (60) is in the range of 5 to 8.

13. The battery device according to claim 12, characterized in that: The distance from the outer edge of the connecting flange (61) to the outer surface of the end plate (60) is in the range of 17 mm to 22 mm.

14. The battery device according to claim 12, characterized in that: The distance from the inner edge of the connecting flange (61) to the inner surface of the end plate (60) is in the range of 3 mm to 14 mm.

15. The battery device according to claim 1, characterized in that: The ratio of the thickness of the upper cover (70) to the thickness of the bottom plate (20) is in the range of 0.04 to 0.

1.

16. The battery device according to claim 1, characterized in that: The ratio of the height of the side wall (72) to the height of the first extension portion (51) is in the range of 8 to 30.

17. The battery device according to claim 1, characterized in that: The first fastener (80) includes a first bolt.

18. The battery device according to claim 1, characterized in that The distance between the first fastener (80) and the lower edge of the side wall (72) is in the range of 1 mm to 3 mm.

19. The battery device according to claim 1, characterized in that: The distance from the first fastener (80) to the upper edge of the first extension portion (51) is in the range of 12 mm to 22 mm.

20. The battery device according to claim 17, characterized in that A ratio of the diameter of the first bolt to the height of the first extension portion (51) is in the range of 0.25 to 0.

6.

21. The battery device according to claim 17, characterized in that: The battery device also includes a first sealing ring, which is sandwiched between the side wall (72) and the first extension portion (51), and surrounds the first bolt.

22. The battery device according to claim 21, characterized in that The ratio of the distance between the first bolt and the first sealing ring to the distance between the first bolt and the lower edge of the side wall (72) is in the range of 1.6 to 2.

6.

23. The battery device according to claim 1, characterized in that A connecting flange (61) is arranged at the edge of the end plate (60), the connecting flange (61) is arranged perpendicular to the end plate (60), and the end of the upper cover (70) is fixed on the connecting flange (61).

24. The battery device according to claim 23, characterized in that A second fastener (90) is provided between the upper cover (70) and the connecting flange (61), and the second fastener (90) comprises a second bolt.

25. The battery device according to claim 24, characterized in that There are a plurality of second bolts arranged at intervals, and a distance between adjacent second bolts is in a range of 70 mm to 120 mm.

26. The battery device according to claim 25, characterized in that A ratio of a diameter of the second bolt to a distance between adjacent second bolts is in a range of 0.04 to 0.

07.

27. The battery device according to claim 26, characterized in that The battery device further comprises a second sealing ring, which is sandwiched between the upper cover (70) and the connecting flange (61), and surrounds the second bolt, and the diameter of the second bolt, the distance between adjacent second bolts and the width of the second sealing ring satisfy: G / H ranges from 328 to 575; Wherein, G is the ratio of the diameter of the second bolt to the distance between adjacent second bolts, and H is the width of the second sealing ring.

28. The battery device according to claim 26, characterized in that The distance between the second bolt and the outer edge of the connecting flange (61) is in the range of 7 mm to 10 mm.

29. The battery device according to claim 26, characterized in that The distance between the second bolt and the inner edge of the connecting flange (61) is in the range of 11 mm to 18 mm.

30. The battery device according to claim 1, characterized in that The material of the bottom plate (20) includes aluminum alloy 6061-T6\6063-T6.

31. The battery device according to claim 1, characterized in that The material of the upper cover (70) includes a cold-rolled steel plate or a composite material.

32. The battery device according to claim 1, characterized in that The strength of the upper cover (70) is greater than the strength of the bottom plate (20).

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