Battery device

Abstract

The present invention provides a battery device, including a battery compartment, the battery compartment including a bottom plate and a surrounding frame arranged at the edge of the bottom plate, the bottom plate and the surrounding 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, the battery device also includes a reinforcing beam, the reinforcing beam is fixedly connected to the bottom plate, the reinforcing beam is used to connect the battery compartment with a vehicle frame, and the reinforcing beam is located above the vehicle frame, and the bottom plate is located above the vehicle frame. By providing the reinforcing beam, the vehicle frame can support the battery compartment from below, preventing the bottom plate from collapsing downward due to the excessive weight of the batteries in the battery compartment.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and specifically to a battery device. Background Technology

[0002] With technological advancements, more types of vehicles are adopting new energy technologies, such as commercial trucks and vans. In these long-wheelbase vehicles, a long, strip-shaped battery pack is installed at the bottom of the frame. In existing technology, lifting lugs are typically used to suspend the battery pack between the crossbeams and longitudinal beams at the bottom of the frame. However, for long, strip-shaped battery packs, which house multiple battery cells and form lever arms along their length, the middle section is prone to collapsing downwards after hoisting, potentially leading to breakage of the battery pack's base plate. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the long strip battery pack in the prior art is prone to collapse in the middle after hoisting, thereby providing a battery device.

[0004] To address the aforementioned problems, the present invention provides a battery device including a battery compartment. The battery compartment includes a base plate and a surrounding frame disposed along the edge of the base plate. The base plate and the surrounding frame form a receiving space for accommodating a battery. The base plate supports the battery. The battery compartment has an elongated structure and has length and width directions. The ratio of the length to the width of the battery compartment is in the range of 2.1 to 3.5. The battery device also includes a reinforcing beam, which is fixedly connected to the base plate. The reinforcing beam is used to connect the battery compartment to the vehicle frame, and the reinforcing beam is located above the vehicle frame, as is the base plate.

[0005] Optionally, the length-to-width ratio of the battery compartment is in the range of 2.1 to 3.5.

[0006] Optionally, the relationship between the thickness of the base plate, the length of the battery compartment, and the width of the battery compartment satisfies that B / A is in the range of 2.8 to 8; where B is the thickness of the base plate and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0007] Optionally, the relationship between the width of the reinforcing beam, the length of the battery compartment, and the width of the battery compartment satisfies the following: D / A is in the range of 4.2 to 14.2; where D is the width of the reinforcing beam, and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0008] Optionally, the reinforcing beam is a crossbeam, which is set on the surface of the base plate facing the interior space of the battery compartment, and the crossbeam is fixedly connected to the vehicle frame.

[0009] Optionally, the base plate is provided with fixing holes, the crossbeam is provided with fixing columns, the end face of the fixing columns is provided with connecting holes, the fixing columns pass through the connecting holes, and the crossbeam is fixedly connected to the vehicle frame through the connecting holes.

[0010] Optionally, the width-to-thickness ratio of the beam is in the range of 1.0 to 3.7.

[0011] Optionally, the thickness of the crossbeam is in the range of 13.3 mm to 23.3 mm.

[0012] Optionally, multiple reinforcing beams are provided, and the multiple reinforcing beams are spaced apart along the length of the battery compartment. The relationship between the spacing between adjacent reinforcing beams, the length of the battery compartment, and the width of the battery compartment satisfies: E / A is in the range of 282 to 480; where E is the spacing between adjacent reinforcing beams, and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0013] Optionally, multiple reinforcing beams are provided, and the multiple reinforcing beams are spaced apart along the length of the battery compartment. The relationship between the number of reinforcing beams, the length of the battery compartment, and the width of the battery compartment satisfies the following: F / A is in the range of 0.85 to 1.4; where F is the number of reinforcing beams and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0014] Optionally, a heat exchange medium channel is provided inside the base plate.

[0015] Optionally, the relationship between the thickness of the base plate, the length of the battery compartment, and the width of the battery compartment satisfies the following: B / A is in the range of 2.85 to 8; where B is the thickness of the base plate, and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0016] Optionally, at least one side of the base plate is provided with an extension that extends in a direction perpendicular to the plane of the base plate.

[0017] Optionally, the extension includes a first extension that extends along the long side of the base plate.

[0018] Optionally, the ratio of the thickness of the first extension to the length of the battery compartment is in the range of 0.06% to 0.15%.

[0019] Optionally, the ratio of the height of the first extension to the length of the battery compartment is in the range of 0.35% to 1.0%.

[0020] Optionally, the extension includes a second extension extending along the short side of the base plate, the second extension forming an end plate.

[0021] Optionally, end plates are provided on both short sides of the base plate.

[0022] Optionally, the battery device also includes a top cover that is fastened to the bottom plate. A third extension is provided on the side of the top cover corresponding to the bottom plate. The upper end of the end plate cooperates with the lower end of the third extension, and the height of the end plate is greater than the height of the third extension.

[0023] Optionally, the ratio of the height of the end plate to the height of the third extension is in the range of 13.5 to 14.5.

[0024] Optionally, a connecting flange is provided at the edge of the end plate, and the connecting flange is perpendicular to the end plate.

[0025] Optionally, the ratio of the width of the connecting flange to the thickness of the end plate is in the range of 5 to 8.

[0026] Optionally, the distance from the outer edge of the connecting flange to the outer surface of the end plate is in the range of 17mm to 22mm.

[0027] Optionally, the distance from the inner edge of the connecting flange to the inner surface of the end plate is in the range of 3 mm to 14 mm.

[0028] Optionally, the battery device also includes a top cover, the ratio of the thickness of the top cover to the thickness of the base plate being in the range of 0.04 to 0.1.

[0029] Optionally, the top cover includes a top wall and a side wall disposed on the side of the top wall, the side wall being used to mate with the long side of the bottom plate, and the height of the side wall being greater than the height of the first extension.

[0030] Optionally, the ratio of the height of the sidewall to the height of the first extension is in the range of 8 to 30.

[0031] Optionally, when the top cover is fastened to the base plate, the side wall and the first extension have overlapping portions.

[0032] Optionally, the battery assembly further includes a first fastener adapted to connect the base plate and the top cover, the first fastener being connected to the overlapping portion.

[0033] Optionally, the first fastener includes a first bolt.

[0034] Optionally, the distance from the first fastener to the lower edge of the sidewall is in the range of 1 mm to 3 mm.

[0035] Optionally, the distance from the first fastener to the upper edge of the first extension is in the range of 12mm to 22mm.

[0036] Optionally, the ratio of the diameter of the first bolt to the height of the first extension is in the range of 0.25 to 0.6.

[0037] Optionally, the battery device further includes a first sealing ring sandwiched between the sidewall and the first extension, and the first sealing ring surrounds the first bolt.

[0038] Optionally, 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 sidewall is in the range of 1.6 to 2.6.

[0039] Optionally, a connecting flange is provided at the edge of the end plate, the connecting flange is perpendicular to the end plate, and the end of the top cover is fixed to the connecting flange.

[0040] Optionally, a second fastener, including a second bolt, is provided between the top cover and the connecting flange.

[0041] Optionally, there may be multiple second bolts spaced apart, with the distance between adjacent second bolts ranging from 70mm to 120mm.

[0042] Optionally, 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.

[0043] Optionally, the battery device further includes a second sealing ring sandwiched between the top cover and the connecting flange, and the second sealing ring surrounds the second bolt. The diameter of the second bolt, the distance between adjacent second bolts, and the width of the second sealing ring satisfy the following: G / H is in the range of 328 to 575; where 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.

[0044] Optionally, the distance between the second bolt and the outer edge of the connecting flange is in the range of 7mm to 10mm.

[0045] Optionally, the distance between the second bolt and the inner edge of the connecting flange is in the range of 11 mm to 18 mm.

[0046] Optionally, the base plate material includes aluminum alloy 6061-T6 and 6063-T6.

[0047] Alternatively, the cover may be made of cold-rolled steel or composite materials.

[0048] Optionally, the strength of the top cover is greater than the strength of the bottom plate.

[0049] Optionally, a battery pack is provided inside the battery compartment, the battery pack including multiple batteries, and adjacent batteries are connected by conductive busbars, wherein the ratio of the width of the conductive busbars to the length of the battery compartment is in the range of 4.4% to 5.3%.

[0050] Optionally, the ratio of the thickness of the conductive busbar to the length of the battery compartment is in the range of 0.08% to 0.1%.

[0051] Optionally, the conductive bus includes a first connecting piece, a second connecting piece, and an elastic segment. The first connecting piece and the second connecting piece are respectively used to connect to the terminals of adjacent batteries. The elastic segment is connected between the first connecting piece and the second connecting piece. The elastic segment includes an arc-shaped portion. When the conductive bus vibrates, the first connecting piece and the second connecting piece can deflect around the arc-shaped portion.

[0052] Optionally, the ratio of the surface area of ​​the elastic segment to the length of the battery compartment is in the range of 2.6% to 5.3%.

[0053] Optionally, the heat exchange medium channels are in multiple sets, and the multiple sets of heat exchange medium channels are distributed at intervals along the width direction of the battery compartment. The relationship between the wall thickness of the heat exchange medium channels in adjacent sets, the length of the battery compartment, and the width of the battery compartment satisfies that I / A is in the range of 0.57 to 0.95; where I is the wall thickness between adjacent sets of heat exchange medium channels, and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0054] Optionally, the reinforcing beam is connected to the base plate by a third fastener, which includes a third bolt. The connection position of the third bolt on the base plate is located in the portion between the heat exchange medium channels of adjacent groups.

[0055] Optionally, the relationship between the fastening area of ​​the third bolt, the length of the battery compartment, and the width of the battery compartment satisfies the following condition: J / A is in the range of 129 to 215; where J is the fastening area of ​​the third bolt, and A is the ratio of the length of the battery compartment to the width of the battery compartment.

[0056] Optionally, the battery device also includes an electrical compartment for housing electrical components, located on one side of the wide side of the battery compartment.

[0057] Optionally, the ratio of the length of the electrical compartment to the length of the battery compartment is in the range of 2.6% to 5.3%.

[0058] Optionally, an output stage structure is provided on the outer side of the end plate. The output stage structure is connected to the electrical components in the electrical compartment. The battery device also includes a water inlet connector and a water outlet connector. Both the water inlet connector and the water outlet connector are connected to the heat exchange medium channel. The output stage structure, the water inlet connector, and the water outlet connector are located on the same side of the electrical compartment.

[0059] Optionally, the wide edge of the base plate protrudes beyond the end plate, and the portion of the base plate protruding beyond the end plate forms a protruding section, with the inlet and outlet connectors located on the protruding section.

[0060] Optionally, the ratio of the length of the protruding section to the sum of the lengths of the battery compartment and the electrical compartment is in the range of 2% to 3%.

[0061] Optionally, a battery pack is placed inside the battery compartment, and the ratio of the projected length of the battery pack to the length of the battery compartment is in the range of 13.5 to 22.6.

[0062] Optionally, the battery pack includes a battery, and the battery includes two first surfaces disposed opposite each other along the length of the battery compartment, the distance between the inner walls of the two first surfaces being in the range of 0 to 0.06% of the length of the battery compartment.

[0063] Optionally, the battery pack includes multiple batteries, which are spaced apart along the length of the battery compartment. Each battery contains a cell. In a battery pack, the distance between the cells of two batteries located at the ends is in the range of 2.57% to 2.6% of the length of the battery compartment.

[0064] Optionally, the battery pack includes a battery, and the battery includes two second surfaces disposed opposite each other along the width direction of the battery compartment, the distance between the inner walls of the two second surfaces being in the range of 0.155% to 0.157% of the width of the battery compartment.

[0065] Optionally, the battery is a square battery, the battery pack includes multiple square batteries, the multiple square batteries are arranged along the length of the battery compartment, and there are multiple battery packs, the multiple battery packs are arranged along the width of the battery compartment.

[0066] Optionally, the battery extends along the width direction of the battery compartment, and there are multiple batteries arranged along the length direction of the battery compartment. The surface of the battery includes two opposing first surfaces and four second surfaces arranged around the first surfaces. The area of ​​the first surfaces is larger than the area of ​​the second surfaces. The first surfaces are provided with terminal post assemblies, and the length direction of the second surfaces extends along the width direction of the battery compartment.

[0067] The present invention has the following advantages:

[0068] The present invention provides a reinforcing beam on the bottom plate of the battery compartment, located above the vehicle frame, connecting the battery compartment to the vehicle frame. By providing the reinforcing beam, the vehicle frame can support the battery compartment from below, preventing the bottom plate from collapsing due to the excessive weight of the batteries inside. Therefore, the present invention solves the problem of long, strip-shaped battery packs in the prior art easily collapsing in the middle after hoisting. Attached Figure Description

[0069] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0070] Figure 1 A schematic diagram of the battery device of the present invention is shown;

[0071] Figure 2 It shows Figure 1 A schematic diagram of the connection between the side wall of the battery unit and the floor;

[0072] Figure 3 It shows Figure 1 A schematic diagram showing the connection between the top cover and the end plate of the battery device;

[0073] Figure 4 It shows Figure 1 A schematic diagram of the battery unit after the top cover has been removed;

[0074] Figure 5 It shows Figure 1 A schematic diagram of the structure of the base plate and end plate of the battery device;

[0075] Figure 6 It shows Figure 1 A schematic diagram of the structure at the first extension of the battery device;

[0076] Figure 7 It shows Figure 1 A schematic diagram of the structure after the reinforcement beams have been removed from the base plate of the battery unit;

[0077] Figure 8 It shows Figure 1 A schematic diagram of the reinforcing beam of the battery device;

[0078] Figure 9 It shows Figure 1 A schematic diagram of the structure at the end plate of the battery device;

[0079] Figure 10 It shows Figure 1 A schematic diagram of the structure of adjacent cells in the battery pack of the battery device;

[0080] Figure 11 It shows Figure 1 A schematic diagram of the conductive busbar in the battery device.

[0081] Explanation of reference numerals in the attached figures:

[0082] 10. Battery compartment; 20. Base plate; 21. Fixing hole; 22. Protruding section; 30. Reinforcing beam; 31. Fixing column; 311. Connecting hole; 40. Heat exchange medium channel; 50. Extension; 51. First extension; 52. Second extension; 60. End plate; 61. Connecting flange; 70. Top 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 busbar; 201. First connecting piece; 202. Second connecting piece; 203. Elastic section; 204. Arc-shaped part; 400. Electrical compartment; 500. Output stage structure; 600. Water inlet connector; 700. Water outlet connector. Detailed Implementation

[0083] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0084] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0085] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] Furthermore, 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.

[0087] like Figures 1 to 9As shown, an embodiment of the battery device according to this application includes a battery compartment 10, which is a long strip structure and has a length direction and a width direction. The ratio of the length to the width of the battery compartment 10 is in the range of 2.1 to 3.5. A larger ratio of the length to the width of the battery compartment 10 indicates a more elongated shape, and vice versa, a smaller ratio indicates a relatively shorter length.

[0088] For example, the ratio of the length to the width of the battery compartment 10 can be 2.1, 2.3, 2.5, 2.7, 3, or 3.5, etc.

[0089] Furthermore, the battery compartment 10 includes a base plate 20 for supporting the battery. A frame is provided along the edge of the base plate 20, and the base plate 20 and the frame together form a receiving space for accommodating the battery. The battery assembly also includes a reinforcing beam 30, which is fixedly connected to the base plate 20. The reinforcing beam 30 connects the battery compartment 10 to the vehicle frame and is located above the vehicle frame. The base plate 20 is also located above the vehicle frame.

[0090] 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, connecting 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 due to the excessive weight of the batteries inside the battery compartment 10. Therefore, the technical solution of this embodiment solves the defect in the prior art where long strip battery packs are prone to collapse in the middle after hoisting.

[0091] like Figure 5 As shown, the base plate 20 in this embodiment has a rectangular structure, with... Figure 4 To illustrate, in the direction shown, the side of the base plate 20 is the long side in the length of the battery compartment 10, and the side of the base plate 20 is the short side in the width direction of the battery compartment 10.

[0092] More preferably, the ratio of the length to the width of the battery compartment 10 is in the range of 2.1 to 3.5.

[0093] In the technical solution of this embodiment, the relationship between the thickness of the base plate 20, the length of the battery compartment 10, and the width of the battery compartment 10 satisfies:

[0094] B / A is in the range of 2.8 to 8;

[0095] Where B is the thickness of the base plate 20, and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10.

[0096] Specifically, the thickness of the base plate 20 refers to the thickness of the material of the base plate 20.

[0097] The larger the ratio of the length to the width of the battery compartment 10, the longer the battery compartment 10 is, and therefore the heavier the battery inside the battery compartment 10. It is necessary to appropriately increase the thickness of the base plate 20 to increase the strength and load-bearing capacity of the base plate 20.

[0098] The smaller the ratio of the length to the width of the battery compartment 10, the smaller the battery compartment 10 is. Therefore, the weight of the battery inside the battery compartment 10 is relatively light, and the thickness of the base plate 20 can be appropriately reduced to avoid the base plate 20 being too thick and taking up too much space.

[0099] Optionally, the value of B / A can be 2.8, 3, 4, 5, or 8, etc.

[0100] 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:

[0101] D / A is in the range of 4.2 to 14.2;

[0102] Where 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.

[0103] Specifically, the width of the reinforcing beam 30 refers to the dimension of the reinforcing beam 30 along its length.

[0104] The larger the ratio of the length to the width of the battery compartment 10, the longer the battery compartment 10 is, and therefore the heavier the battery inside the battery compartment 10. 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.

[0105] The smaller the ratio of the length to the width of the battery compartment 10, the smaller the battery compartment 10 is. Therefore, the weight of the battery inside the battery compartment 10 is relatively light, and the width of the reinforcing beam 30 can be appropriately reduced to avoid the reinforcing beam 30 using too much space due to its excessive width.

[0106] Optionally, the value of D / A can be 4.2, 5, 8, 10, 14, or 14.2, etc.

[0107] like Figure 5 and Figure 6 As shown, in the technical solution of this embodiment, the reinforcing beam 30 is a crossbeam, which is set on the surface of the bottom plate 20 facing the internal space of the battery compartment 10, and the crossbeam is fixedly connected to the vehicle frame.

[0108] from Figure 5 and Figure 6As can be seen, the reinforcing beam 30 is a long strip-shaped crossbeam structure, which is set inside the battery compartment 10 and connected to the bottom plate 20. The crossbeam extends along the width direction of the battery compartment 10.

[0109] Optionally, since the middle part of the base plate 20 is the location of the most severe deformation and collapse, the crossbeam is set in the middle part of the base plate 20 in this embodiment.

[0110] 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 crossbeam, 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 crossbeam is fixedly connected to the vehicle frame through the connecting hole 311.

[0111] Specifically, during assembly, the fixing post 31 is passed through the fixing hole 21 to fix the relative position of the crossbeam on the base plate 20. The crossbeam of the vehicle frame has holes. By aligning the fixing holes with the holes on the crossbeam of the vehicle frame, and then inserting fasteners into both, the battery compartment 10 can be fixed to the vehicle frame.

[0112] Optionally, multiple fixing holes 21 are provided, and the multiple fixing holes 21 are arranged along the width direction of the battery compartment 10. Multiple fixing holes are also provided on the crossbeam accordingly.

[0113] Optionally, the width-to-thickness ratio of the beam is in the range of 1.0 to 3.7.

[0114] If the width and thickness of the crossbeam are too large, it will occupy too much space within the battery compartment 10. If the width and thickness of the crossbeam are too small, the strength of the crossbeam will not meet the requirements. Therefore, the ratio of the width to the thickness of the crossbeam should be reasonably selected while ensuring the supporting strength of the battery compartment 10.

[0115] 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.

[0116] Optionally, the thickness of the crossbeam is in the range of 13.3 mm to 23.3 mm.

[0117] For example, the thickness of the crossbeam can be selected as 13.3mm, 14mm, 18mm, 20mm, 23mm, or 23.3mm, etc.

[0118] like Figure 5 As shown, in this embodiment, multiple reinforcing beams 30 are arranged along the length of the battery compartment 10. In this embodiment, three reinforcing beams 30 are used, and adjacent reinforcing beams 30 form a space for placing batteries.

[0119] Of course, the number of reinforcing beams 30 can also be set to other quantities.

[0120] 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:

[0121] E / A ranges from 282 to 480;

[0122] Where E is the spacing between adjacent reinforcing beams 30, and A is the ratio of the length of battery compartment 10 to the width of battery compartment 10.

[0123] The larger the ratio of the length to the width of the battery compartment 10, the longer the battery compartment 10 is, and therefore the heavier the battery inside the battery compartment 10. The spacing between adjacent reinforcing beams 30 should be appropriately reduced to prevent the base plate 20 between adjacent reinforcing beams 30 from being too long and failing to guarantee the support effect for the battery compartment 10.

[0124] The smaller the ratio of the length to the width of the battery compartment 10, the smaller the battery compartment 10 is, and therefore the lighter the weight of the battery inside the battery compartment 10. The spacing between adjacent reinforcing beams 30 is appropriately increased to prevent too many reinforcing beams 30 from occupying too much space and increasing the weight of the battery device.

[0125] Optionally, the value of E / A can be 282, 300, 320, 350, 400, 450 or 48, etc.

[0126] Furthermore, the relationship between the number of reinforcing beams 30, the length of battery compartment 10, and the width of battery compartment 10 satisfies the following condition: F / A is in the range of 0.85 to 1.4; where F is the number of reinforcing beams 30, and A is the ratio of the length of battery compartment 10 to the width of battery compartment 10.

[0127] The larger the ratio of the length to the width of the battery compartment 10, the longer the battery compartment 10 is, and therefore the heavier the battery inside the battery compartment 10 is. This requires a greater number of reinforcing beams 30 to ensure the support effect of the battery compartment 10.

[0128] The smaller the ratio of the length to the width of the battery compartment 10, the smaller the battery compartment 10 is, and therefore the lighter the weight of the battery inside the battery compartment 10. In this case, a smaller number of reinforcing beams 30 are sufficient.

[0129] Optionally, the value of F / A can be 0.85, 0.9, 1, 1.1 or 1.4, etc.

[0130] like Figure 9As shown, in this embodiment, a heat exchange medium channel 40 is provided within the base plate 20. The heat exchange medium can flow within the heat exchange medium channel 40 and exchange heat with the battery. That is, the base plate 20 in this embodiment also serves as a cold plate, thereby simplifying the structure and space occupied by the battery device.

[0131] Of course, in some embodiments not shown, a cold plate may be provided separately, that is, the base plate 20 is not used as a cold plate.

[0132] Furthermore, when the base plate 20 also serves as a cold plate, the relationship between the thickness of the base plate 20, the length of the battery compartment 10, and the width of the battery compartment 10 satisfies:

[0133] B / A is in the range of 2.85 to 8;

[0134] Where B is the thickness of the base plate 20, and A is the ratio of the length of the battery compartment 10 to the width of the battery compartment 10.

[0135] Specifically, when the base plate 20 also functions as a cold plate, a heat exchange medium channel 40 is also provided within the base plate 20. Therefore, the thickness of the base plate 20 needs to be appropriately increased to ensure the heat exchange effect on the battery 101 and to ensure the structural strength of the base plate 20. Correspondingly, the value of B / A can be appropriately increased.

[0136] Optionally, when the base plate 20 is also used as a cold plate, B / A can be 2.85, 3, 3.5, 4 or 8, etc.

[0137] like Figure 3 and Figure 6 As shown, in this embodiment, at least one side of the base plate 20 is provided with an extension 50, which extends in a direction perpendicular to the plane of the base plate 20. The extension 50 is used to connect with the upper cover 70 of the battery device.

[0138] Those skilled in the art will understand that the extension 50 forms the aforementioned enclosure.

[0139] like Figure 6 As shown, in the technical solution of this embodiment, the extension 50 includes a first extension 51 extending along the long side of the base plate 20.

[0140] Specifically, the first extension 51 extends along the length of the battery compartment 10. The first extension is provided on both long sides of the base plate 20.

[0141] In the technical solution of this embodiment, the ratio of the thickness of the first extension 51 to the length of the battery compartment 10 is in the range of 0.06% to 0.15%.

[0142] It should be noted that the thickness of the first extension 51 refers to the thickness of the profile of the first extension 51.

[0143] Furthermore, the thickness of the first extension 51 should not be too large. If the thickness of the first extension 51 is too large, it will increase the weight of the battery device and occupy space in the battery compartment 10. Furthermore, the thickness of the first extension 51 should not be too small. If the thickness of the first extension 51 is too small, the strength of the first extension 51 will be too small and will not meet the connection strength between the base plate 20 and the top cover 70.

[0144] Optionally, the ratio of the thickness of the first extension 51 to the length of the battery compartment 10 can be 0.06%, 0.07%, 0.08%, 0.1%, 0.12%, or 0.15%, etc.

[0145] In the technical solution of this embodiment, the ratio of the height of the first extension 51 to the length of the battery compartment 10 is in the range of 0.35% to 1.0%.

[0146] It should be noted that the height of the first extension 51 refers to the height along the... Figure 4 The dimensions of the first extension 51 in the vertical direction (perpendicular to the length and width directions of the battery compartment 10).

[0147] Furthermore, the height of the first extension 51 should not be too large. If the thickness of the first extension 51 is too large, it will increase the weight of the battery device. Furthermore, the thickness of the first extension 51 should not be too small. If the height of the first extension 51 is too small, the strength of the first extension 51 will be too weak, and it will not be able to meet the connection strength between the base plate 20 and the top cover 70.

[0148] Optionally, the ratio of the height of the first extension 51 to the length of the battery compartment 10 can be 0.35%, 0.4%, 0.5%, 0.7%, or 1.0%.

[0149] like Figure 3 , Figure 4 , Figure 5 and Figure 9 As shown, in the technical solution of this embodiment, the extension 50 includes a second extension 52 extending along the short side of the base plate 20, and the second extension 52 forms an end plate 60.

[0150] Specifically, end plates 60 are provided on both short sides of the base plate 20. The end plates 60 form the front and rear surfaces of the battery device and are used to connect with the top cover 70.

[0151] In this embodiment, the upper cover 70 is directly connected to the end plate 60. In some embodiments not shown, the upper cover 70 may also have a third extension on the side (i.e., the short side) corresponding to the bottom plate 20, and the upper end of the end plate 60 engages with the lower end of the third extension. In this embodiment, the height of the end plate 60 is greater than the height of the third extension.

[0152] Optionally, the ratio of the height of the end plate 60 to the height of the third extension is in the range of 13.5 to 14.5.

[0153] For example, the ratio of the height of the end plate 60 to the height of the third extension can be selected as 13.5, 13.7, 13.9, 14, 14.2 or 14.5, etc.

[0154] like Figure 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 perpendicular to the end plate 60.

[0155] Specifically, the top edge and two sides of the end plate 60 are provided with connecting flanges 61. When the top cover 70 is placed on the bottom plate 20, the edge of the top cover 70 fits against the connecting flanges 61, so the top cover 70 can be connected to the connecting flanges 61 by fasteners.

[0156] Those skilled in the art will understand that the cross-sections of the end plate 60 and the connecting flange 61 can be formed in a similar "T" shape or in a similar inverted "L" shape.

[0157] 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.

[0158] 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.

[0159] Specifically, the ratio of the width of the connecting flange 61 to the thickness of the end plate 60 should not be too large, otherwise it will affect the overall strength of the battery device.

[0160] Optionally, the ratio of the width of the connecting flange 61 to the thickness of the end plate 60 can be selected as 5, 6, 7 or 8, etc.

[0161] 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 17mm to 22mm.

[0162] 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, it will increase the space occupied by the connecting flange 61; if the distance is too small, it will reduce the strength of the connecting flange 61, and the fasteners will easily crush the connecting flange 61 when subjected to external force.

[0163] 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 17mm, 18mm, 19mm, 20mm, 21mm or 22mm, etc.

[0164] 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 3mm to 14mm.

[0165] 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, it will increase the space occupied by the connecting flange 61; if the distance is too small, it will reduce the strength of the connecting flange 61, and the fasteners will easily crush the connecting flange 61 when subjected to external force.

[0166] Optionally, the distance from the inner edge of the connecting flange 61 to the inner surface of the end plate 60 can be selected as 3mm, 5mm, 7mm, 9mm, 11mm or 14mm, etc.

[0167] 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 base plate 20 is in the range of 0.04 to 0.1.

[0168] It should be noted that the thickness of the top cover 70 refers to the thickness of the top cover 70 profile.

[0169] Specifically, in order to ensure the stability of the battery device, the thickness of the top cover 70 should be less than the thickness of the bottom plate 20.

[0170] Optionally, the ratio of the thickness of the top cover 70 to the thickness of the bottom plate 20 can be 0.04, 0.05, 0.06, 0.08, or 1, etc.

[0171] 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 disposed on the side of the top wall 71. 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 51.

[0172] Specifically, the top cover 70 has a roughly U-shaped cross-section. The lower end of the side wall 72 mates with the first extension 51 and is connected by fasteners. The front and rear edges of the top cover 70 mate with the aforementioned connecting flange 61 and are connected by fasteners.

[0173] By making the height of the sidewall 72 greater than the height of the first extension 51, the overall weight of the base plate 20 can be reduced.

[0174] In the technical solution of this embodiment, the ratio of the height of the sidewall 72 to the height of the first extension 51 is in the range of 8 to 30.

[0175] Specifically, the height of the first extension 51 should be moderate, and the weight of the base plate 20 should be reduced as much as possible while ensuring the structural strength of the base plate 20.

[0176] Optionally, the ratio of the height of the sidewall 72 to the height of the first extension 51 can be 8, 10, 12, 15, 20, or 30, etc.

[0177] like Figure 1 and Figure 6 As shown, in the technical solution of this embodiment, when the upper cover 70 is fastened to the bottom plate 20, the side wall 72 and the first extension 51 have overlapping portions.

[0178] Specifically, when the top cover 70 is fastened onto the base plate 20, the lower end of the side wall 72 covers at least a portion of the first extension 51, thus creating an overlapping portion between the side wall 72 and the first extension 51. This overlapping portion facilitates the installation of fasteners connecting the top cover 70 and the base plate 20.

[0179] In the technical solution of this embodiment, the battery device further includes a first fastener 80, which is adapted to connect the base plate 20 and the top cover 70, and the first fastener 80 is connected to the overlapping part.

[0180] 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 51. During assembly, the connecting hole on the side wall 72 and the connecting hole on the first extension 51 are aligned, and the first fastener 80 passes through the two connecting holes to realize the connection between the top cover 70 and the bottom plate 20 on the long side.

[0181] Optionally, the first fastener 80 includes a first bolt.

[0182] 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 1mm to 3mm.

[0183] Specifically, the distance between the first fastener 80 and the lower edge of the side wall 72 should not be too small. If the distance is too small, the lower edge of the side wall 72 is easily crushed when the first fastener 80 is subjected to external force.

[0184] Optionally, the distance from the first fastener 80 to the lower edge of the sidewall 72 can be selected as 1mm, 2mm or 3mm, etc.

[0185] In the technical solution of this embodiment, the distance from the first fastener 80 to the upper edge of the first extension 51 is in the range of 12mm to 22mm.

[0186] Specifically, the distance between the first fastener 80 and the upper edge of the first extension 51 should not be too small. If the distance is too small, the upper edge of the first extension 51 will be easily crushed when the first fastener 80 is subjected to external force.

[0187] Optionally, the distance from the first fastener 80 to the upper edge of the first extension 51 can be selected as 12mm, 14mm, 16mm, 19mm or 22mm, etc.

[0188] In the technical solution of this embodiment, the ratio of the diameter of the first bolt to the height of the first extension 51 is in the range of 0.25 to 0.6.

[0189] Specifically, when the height of the first extension 51 is small, the diameter of the first bolt can be appropriately reduced; when the height of the first extension 51 is large, the diameter of the first bolt can be appropriately increased.

[0190] Optionally, the ratio of the diameter of the first bolt to the height of the first extension 51 can be selected as 0.25, 0.3, 0.35, 0.4, 0.5 or 0.6.

[0191] In this embodiment, the battery device further includes a first sealing ring, which is sandwiched between the side wall 72 and the first extension 51, and surrounds the first bolt. The first sealing ring ensures the sealing performance between the side wall 72 and the first extension 51.

[0192] 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 sidewall 72 is in the range of 1.6 to 2.6.

[0193] 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, which is also the radial width of the first sealing ring after compression.

[0194] 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 sidewall 72, can be selected as 1.6, 1.8, 2, 2.2, 2.4 or 2.6.

[0195] 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.

[0196] Specifically, the upper cover 70 has connecting holes along its edge, and the connecting flange 61 also has connecting holes. During assembly, the connecting holes along the edge of the upper cover 70 and the connecting holes of the connecting flange 61 are aligned, and the second fastener 90 passes through the two connecting holes to achieve the connection between the upper cover 70 and the end plate.

[0197] Optionally, there are multiple second bolts spaced apart, with the multiple second bolts spaced apart 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.

[0198] Optionally, the distance between adjacent second bolts is in the range of 70mm to 120mm.

[0199] For example, the distance between adjacent second bolts can be selected as 70mm, 80mm, 90mm, 100mm, 110mm or 120mm, etc.

[0200] 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.

[0201] Specifically, in this embodiment, the larger the straightness of the second bolt, the smaller the distance between adjacent second bolts. Conversely, the smaller the straightness of the second bolt, the larger the distance between adjacent second bolts.

[0202] Optionally, the ratio of the diameter of the two bolts to the distance between adjacent second bolts can be selected as 0.04, 0.05, 0.06, or 0.07, etc.

[0203] In 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 ensures the sealing performance between the upper cover 70 and the connecting flange 61.

[0204] Furthermore, the diameter of the second bolt, the distance between adjacent second bolts, and the width of the second sealing ring satisfy the following conditions:

[0205] G / H is in the range of 328 to 575;

[0206] Where 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.

[0207] 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.

[0208] Furthermore, the larger the ratio of the diameter of the second bolt to the distance between adjacent second bolts, the wider the second sealing ring needs to be to ensure sealing performance. Conversely, the smaller the ratio of the diameter of the second bolt to the distance between adjacent second bolts, the wider the second sealing ring can be appropriately reduced.

[0209] Optionally, the value of G / H can be 328, 350, 370, 390, 450, 475, 500, or 575, etc.

[0210] 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 7mm to 10mm.

[0211] 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 second bolt may crush the outer edge of the connecting flange 61 when subjected to external force.

[0212] Optionally, the distance between the second bolt and the outer edge of the connecting flange 61 can be 7mm, 8mm, 9mm or 10mm, etc.

[0213] 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 11mm to 18mm.

[0214] 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 is easily crushed when the second bolt is subjected to external force.

[0215] Optionally, the distance between the second bolt and the inner edge of the connecting flange 61 can be 11mm, 13mm, 15mm, 17mm or 18mm, etc.

[0216] Optionally, the base plate 20 may be made of aluminum alloy 6061-T6 or 6063-T6.

[0217] Alternatively, the material of the cover 70 may include cold-rolled steel sheet or composite materials.

[0218] Furthermore, since the area of ​​the upper cover 70 is larger, the strength of the upper cover 70 is greater than that of the base plate 20.

[0219] Optionally, the tensile strength of the top 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.

[0220] like Figure 4 , Figure 10 and Figure 11As shown, in the technical solution of this embodiment, a battery pack 100 is provided in the battery compartment. The battery pack 100 includes a plurality of batteries 101. Adjacent batteries 101 are connected by a conductive busbar 200. The ratio of the width of the conductive busbar 200 to the length of the battery compartment 10 is in the range of 4.4% to 5.3%.

[0221] It should be noted that the width of the conductive bus 200 refers to the dimension of the conductive bus 200 along the width direction of the battery compartment 10.

[0222] Specifically, the conductive bus 200 is used to connect the terminals of adjacent batteries 101. The longer the battery compartment 10 is, the more batteries 101 are inside the battery compartment 10, and the greater the current during operation. Therefore, the conductive bus 200 needs to have a larger width to give it a higher current carrying capacity.

[0223] Optionally, the ratio of the width of the conductive busbar 200 to the length of the battery compartment 10 can be selected as 4.4%, 4.6%, 4.8%, 5%, or 5.3%, etc.

[0224] In the technical solution of this embodiment, the ratio of the thickness of the conductive busbar 200 to the length of the battery compartment 10 is in the range of 0.08% to 0.1%.

[0225] As mentioned above, the longer the battery compartment 10 is, the more batteries 101 are inside the battery compartment 10, and the greater the current during operation. Therefore, the conductive bus 200 needs to have a larger thickness so that the conductive bus 200 has a higher current carrying capacity.

[0226] Optionally, the ratio of the thickness of the conductive busbar 200 to the length of the battery compartment 10 can be selected as 0.08%, 0.09%, or 0.1%.

[0227] like Figure 11 As shown, in this embodiment, the conductive busbar 200 includes a first connecting piece 201, a second connecting piece 202, and an elastic segment 203. The first connecting piece 201 and the second connecting piece 202 are respectively used to connect to the terminals of adjacent batteries 101. The elastic segment 203 is connected between the first connecting piece 201 and the second connecting piece 202. The elastic segment 203 includes an arc-shaped portion 204. When the conductive busbar 200 vibrates, the first connecting piece 201 and the second connecting piece 202 can deflect around the arc-shaped portion.

[0228] Specifically, both the first connecting piece 201 and the second connecting piece 202 are square pieces, which are used to connect to the terminals of the adjacent battery 101.

[0229] from Figure 11As can be seen, the cross-section of the arc-shaped portion 204 of the elastic segment 203 has an arc-shaped structure, and the first connecting piece 201 and the second connecting piece 202 can deflect around the arc-shaped portion. Therefore, when the battery device vibrates, the first connecting piece 201 and the second connecting piece 202 can be buffered, preventing damage to the first connecting piece 201 and the second connecting piece 202 and preventing them from falling off the terminal post.

[0230] 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%.

[0231] 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 segment 203 should be appropriately increased to increase the buffering effect on the first connecting piece 201 and the second connecting piece 202.

[0232] 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.

[0233] like Figure 9 As shown, in the technical solution of this embodiment, there are multiple sets of heat exchange medium channels 40, and the multiple sets of heat exchange medium channels 40 are distributed at intervals along the width direction of the battery compartment 10.

[0234] The relationship between the wall thickness of the heat exchange medium channels 40 in adjacent groups, the length of the battery compartment 10, and the width of the battery compartment 10 satisfies:

[0235] I / A is in the range of 0.57 to 0.95;

[0236] Where I is the wall thickness between adjacent heat exchange medium channels 40, and A is the ratio of the length of battery compartment 10 to the width of battery compartment 10.

[0237] from Figure 9 As can be seen, the bottom plate 20 between adjacent heat exchange medium channels 40 has a thicker wall. This part is used to cooperate with the fasteners of the connecting reinforcing beam 30, thereby ensuring the connection strength between the reinforcing beam 30 and the bottom plate.

[0238] The larger the ratio of the length to the width of the battery compartment 10, the longer the battery compartment 10 is, and therefore the heavier the battery inside the battery compartment 10. It is necessary to appropriately increase the wall thickness between the heat exchange medium channels 40 of the adjacent groups to increase the support strength of the base plate 20 and strengthen the connection strength between the beam 30 and the base plate 20.

[0239] The smaller the ratio of the length 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, and the wall thickness between the heat exchange medium channels 40 of the adjacent groups can be appropriately reduced, thereby reducing the size of the base plate 20.

[0240] Optionally, the I / A value can be 0.57, 0.6, 0.7, 0.8, 0.9, or 0.95, etc.

[0241] In the technical solution of this embodiment, the reinforcing beam 30 and the base plate 20 are connected by a third fastener, which includes a third bolt. The connection position of the third bolt on the base plate 20 is located in the part between the heat exchange medium channels 40 of adjacent groups.

[0242] Specifically, after the third bolt passes through the connecting hole in the crossbeam of the vehicle frame, it is tightened into the aforementioned connecting hole 311. That is, the aforementioned fixing hole 21 is located on the base plate 20 between the heat exchange medium channels 40 of adjacent groups, thereby ensuring the connection strength between the third bolt and the base plate 20.

[0243] 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:

[0244] J / A is in the range of 129 to 215;

[0245] Where 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.

[0246] Specifically, this ratio should not be too large, as an excessively large ratio would hinder the sealing between the base plate 20, the reinforcing beam 30, and the vehicle frame. Conversely, this ratio should not be too small, as an excessively small ratio would result in excessive tightening pressure on the third bolt, potentially causing damage to components.

[0247] Optionally, J / A can take values ​​such as 129, 130, 150, 180, 200, 210, or 215.

[0248] like Figure 4 As shown, in the technical solution of this embodiment, the battery device further includes an electrical compartment 400, which is used to place electrical components and is located on one side of the wide side of the battery compartment 10.

[0249] This arrangement can improve the overall utilization rate of the internal space of the battery device.

[0250] 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%.

[0251] Specifically, to ensure efficient use of the internal space of the battery pack, the ratio of the length of the electrical compartment 400 to the length of the battery compartment 10 should not be too large. An excessively large ratio will result in an unbalanced overall weight of the battery pack. Conversely, the ratio should not be too small. An excessively small ratio will lead to insufficient space in the electrical compartment 400, making it impossible to properly arrange electrical components, and resulting in overcrowding of the components. This increases the risk of overheating of electrical components and even potential safety accidents during use.

[0252] 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.

[0253] like Figure 1 , Figure 3 and Figure 9 As shown, in this embodiment, an output stage structure 500 is provided 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. Furthermore, the output stage structure 500 is configured in two opposite positions, one being a positive output terminal and the other a negative output stage.

[0254] 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. The heat exchange medium (coolant) can enter the heat exchange medium channel 40 from the water inlet connector 600 and can be discharged from the water outlet connector 700.

[0255] 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.

[0256] like Figure 1 and Figure 9 As shown, in the technical solution of this embodiment, the wide edge of the base plate 20 protrudes beyond the end plate 60, and the portion of the base plate 20 protruding beyond the end plate 60 forms a protruding section 22. The water inlet connector 600 and the water outlet connector 700 are disposed on the protruding section 22.

[0257] 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 of the three components.

[0258] In the technical solution of this embodiment, the ratio of the length of the protruding segment 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%.

[0259] 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, it will occupy too much space in the battery compartment 10, reducing the capacity of the battery device.

[0260] 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 can be selected as 2%, 2.5% or 3%.

[0261] like Figure 4 and Figure 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.

[0262] 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 ventilation space of the battery pack 100 cannot be met.

[0263] 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.

[0264] like Figure 4 and Figure 10 As shown, in the technical solution of this embodiment, the battery pack 100 includes a battery 101. The battery 101 includes two first surfaces 1011 arranged opposite to each other along the length direction of the battery compartment 10. 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).

[0265] Specifically, the first surface 1011 is the 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 inside the housing cavity of the battery 101.

[0266] 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 its expansion during use.

[0267] 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%.

[0268] like Figure 4 and Figure 10 As shown, in the technical solution of this embodiment, the battery pack 100 includes a plurality of batteries 101, which are spaced apart along the length of the battery compartment 10. Each battery 101 contains a cell. In a battery pack 100, the ratio of the distance between the cells of two batteries 101 located at the ends to the length of the battery compartment 10 is in the range of 2.57% to 2.6%.

[0269] 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 its expansion during use.

[0270] Optionally, in a battery pack 100, the ratio of the distance between the cells of two batteries 101 located at the ends to the length of the battery compartment 10 can be selected as 2.57%, 2.58%, 2.59%, or 2.6%, etc.

[0271] like Figure 4 and Figure 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 disposed opposite to each other along the width direction of the battery compartment 10. 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%.

[0272] Specifically, the second surface 1012 is the small surface of the battery 101, and the distance between the inner walls of the two second surfaces 1012 is also the distance between the two large surfaces inside the housing cavity of the battery 101.

[0273] 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 its expansion during use.

[0274] 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.

[0275] Furthermore, battery 101 can adopt different battery structures.

[0276] In this embodiment, battery 101 is a square battery, battery pack 100 includes multiple square batteries, the multiple square batteries are arranged along the length direction of battery compartment 10, and there are multiple battery packs 100, the multiple battery packs 100 are arranged along the width direction of battery compartment 10.

[0277] In some embodiments not shown, the battery 101 may also be a long strip structure.

[0278] Specifically, the battery 101 extends along the width direction of the battery compartment 10, and there are multiple batteries 101 arranged along the length direction of the battery compartment 10. The surface of the battery 101 includes two opposing first surfaces and four second surfaces arranged around the first surfaces. The area of ​​the first surface is larger than the area of ​​the second surface. The first surface is provided with a terminal post assembly, and the length direction of the second surface extends along the width direction of the battery compartment 10.

[0279] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present 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, The battery device further comprises a reinforcing beam (30), the reinforcing beam (30) being fixedly connected to the bottom plate (20), the reinforcing beam (30) being used to connect the battery compartment (10) to a vehicle frame, and the reinforcing beam (30) being located above the vehicle frame, and the bottom plate (20) being located above the vehicle frame. A battery pack (100) is arranged in the battery compartment, the battery pack (100) comprising a plurality of batteries (101), adjacent batteries (101) being connected via a conductive bar (200), wherein a ratio of a width of the conductive bar (200) to a length of the battery compartment (10) is in a range of 4.4% to 5.3%, The conductive bar (200) comprises 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 poles of adjacent batteries (101); the elastic section (203) is connected between the first connecting piece (201) and the second connecting piece (202); the elastic section (203) comprises 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 (204).

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 claim 1, characterized in that: 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: D / A ranges from 4.2 to 14.2; 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).

5. The battery device according to any one of claims 1 to 4, characterized in that: The reinforcing beam (30) is a cross beam, the cross beam is arranged on a 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.

6. The battery device according to claim 5, characterized in that: The bottom plate (20) is provided with a fixing hole (21), the cross beam is provided with a fixing column (31), an end surface of the fixing column (31) is provided with a connecting hole (311), 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).

7. The battery device according to claim 5, characterized in that: The ratio of the width to the thickness of the beam is in the range of 1.0 to 3.

7.

8. The battery device according to claim 5, characterized in that: The thickness of the beam is in the range of 13.3 mm to 23.3 mm.

9. The battery device according to any one of claims 1 to 4, wherein a plurality of the reinforcing beams (30) are provided, and the plurality of the reinforcing beams (30) are arranged at intervals along the length direction of the battery compartment (10), and the relationship among the spacing between adjacent reinforcing beams (30), the length of the battery compartment (10), and the width of the battery compartment (10) satisfies: E / A ranges from 282 to 480; in, The E is the distance between adjacent reinforcing beams (30), and is characterized in that the A is the ratio of the length of the battery compartment (10) to the width of the battery compartment (10).

10. The battery device according to any one of claims 1 to 4, characterized in that: The reinforcing beam (30) is provided in plurality, and the plurality of reinforcing beams (30) are arranged at intervals along the length direction of the battery compartment (10), and the relationship between the number of the reinforcing beams (30), the length of the battery compartment (10), and the width of the battery compartment (10) satisfies: F / A ranges from 0.85 to 1.4; Wherein, F is the number of the reinforcing beams (30), and A is the ratio of the length of the battery compartment (10) to the width of the battery compartment (10).

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

12. The battery device according to claim 11, 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).

13. The battery device according to any one of claims 1 to 4, characterized in that: An extension portion (50) is provided on at least one side edge of the bottom plate (20), and the extension portion (50) extends in a direction perpendicular to the plane on which the bottom plate (20) is located.

14. The battery device according to claim 13, characterized in that: The extension portion (50) comprises a first extension portion (51) extending along a long side of the bottom plate (20).

15. The battery device according to claim 14, 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%.

16. The battery device according to claim 14, 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%.

17. The battery device according to claim 13, characterized in that: The extension portion (50) comprises 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).

18. The battery device according to claim 17, characterized in that: The end plates (60) are arranged on both short sides of the bottom plate (20).

19. The battery device according to claim 17, characterized in that: The battery device further comprises an upper cover (70), the upper cover (70) being buckled onto the bottom plate (20), a third extension portion being arranged on a side of the upper cover (70) corresponding to the bottom plate (20), the upper end of the end plate (60) being matched with the lower end of the third extension portion, and the height of the end plate (60) being greater than the height of the third extension portion.

20. The battery device according to claim 19, characterized in that The ratio of the height of the end plate (60) to the height of the third extension portion is in the range of 13.5 to 14.

5.

21. The battery device according to claim 17, characterized in that: A connecting flange (61) is provided at the edge of the end plate (60), and the connecting flange (61) is arranged perpendicular to the end plate (60).

22. The battery device according to claim 21, 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.

23. The battery device according to claim 22, 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.

24. The battery device according to claim 22, 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.

25. The battery device according to claim 14, characterized in that The battery device also 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.

26. The battery device according to claim 25, characterized in that The upper cover (70) comprises 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), and the height of the side wall (72) being greater than the height of the first extension portion (51).

27. The battery device according to claim 26, 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.

28. The battery device according to claim 26, characterized in that 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.

29. The battery device according to claim 28, characterized in that The battery device further comprises a first fastener (80), wherein the first fastener (80) is suitable for connecting the bottom plate (20) and the upper cover (70), and the first fastener (80) is connected to the overlapping portion.

30. The battery device according to claim 29, characterized in that The first fastener (80) comprises a first bolt.

31. The battery device according to claim 29, 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.

32. The battery device according to claim 29, 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.

33. The battery device according to claim 30, characterized in that The 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.

34. The battery device according to claim 30, 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.

35. The battery device according to claim 34, 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.

36. The battery device according to claim 25, characterized in that A connecting flange (61) is provided at the edge of the end plate (60), the connecting flange (61) is arranged perpendicular to the end plate (60), and an end of the upper cover (70) is fixed to the connecting flange (61).

37. The battery device according to claim 36, 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.

38. The battery device according to claim 37, 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.

39. The battery device according to claim 38, 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.

40. The battery device according to claim 39, characterized in that The battery device further comprises a second sealing ring, the second sealing ring being sandwiched between the upper cover (70) and the connecting flange (61), and the second sealing ring surrounding the second bolt, the diameter of the second bolt, the distance between adjacent second bolts and the width of the second sealing ring satisfying: 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.

41. The battery device according to claim 39, 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.

42. The battery device according to claim 39, 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.

43. The battery device according to claim 25, characterized in that The material of the bottom plate (20) includes aluminum alloy 6061-T6\6063-T6.

44. The battery device according to claim 25, characterized in that The material of the upper cover (70) includes a cold-rolled steel plate or a composite material.

45. The battery device according to claim 25, characterized in that The strength of the upper cover (70) is greater than the strength of the bottom plate (20).

46. ​​The battery device according to claim 1, characterized in that 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%.

47. The battery device according to claim 1, characterized in that The ratio of the surface area of ​​the elastic section (203) to the length of the battery compartment (10) is in the range of 2.6% to 5.3%.

48. The battery device according to claim 11, characterized in that The heat exchange medium channels (40) are multiple groups, and the multiple groups of heat exchange medium channels (40) are spaced apart along the width direction of the battery compartment (10), and 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: I / A ranged from 0.57 to 0.95; Wherein, I is the wall thickness between adjacent groups of the 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).

49. The battery device according to claim 48, characterized in that The reinforcing beam (30) is connected to the bottom plate (20) via a third fastener, the third fastener comprising a third bolt, the connection position of the third bolt on the bottom plate (20) being located between adjacent groups of the heat exchange medium channels (40).

50. The battery device according to claim 49, characterized in that 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: J / A ranges from 129 to 215; 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).

51. The battery device according to claim 17, characterized in that The battery device further comprises an electrical compartment (400), wherein the electrical compartment (400) is used to place electrical components, and the electrical compartment (400) is located on one side of the wide side of the battery compartment (10).

52. The battery device according to claim 51, characterized in that 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%.

53. The battery device according to claim 52, characterized in that 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). The battery device also includes a water inlet joint (600) and a water outlet joint (700), and the water inlet joint (600) and the water outlet joint (700) are both in communication with the heat exchange medium channel (40). The output stage structure (500), the water inlet joint (600) and the water outlet joint (700) are located on the same side of the electrical compartment (400).

54. The battery device according to claim 53, characterized in that The wide edge of the bottom plate (20) protrudes from the end plate (60), the portion 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).

55. The battery device according to claim 54, characterized in that 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%.

56. The battery device according to claim 1, characterized in that A battery pack (100) is placed in the battery compartment (10), and a ratio of a projected length of the battery pack (100) to a length of the battery compartment (10) is in a range of 13.5 to 22.

6.

57. The battery device according to claim 56, characterized in that The battery pack (100) comprises a battery (101), wherein the battery (101) comprises 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%.

58. The battery device according to claim 56, characterized in that The battery pack (100) comprises a plurality of batteries (101), wherein the plurality of batteries (101) are arranged at intervals along the length direction of the battery compartment (10), wherein the batteries (101) are provided with battery cells, and wherein the ratio of the distance between the battery cells of two batteries (101) located at the ends of one of the battery packs (100) to the length of the battery compartment (10) is in a range of 2.57% to 2.6%.

59. The battery device according to claim 56, characterized in that The battery pack (100) comprises a battery (101), wherein the battery (101) comprises 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 a range of 0.155% to 0.157%.

60. The battery device according to claim 59, characterized in that The battery (101) is a square battery, the battery pack (100) comprises a plurality of square batteries, the plurality of square batteries are arranged along the length direction of the battery compartment (10), and there are a plurality of battery packs (100), the plurality of battery packs (100) are arranged along the width direction of the battery compartment (10).

61. The battery device according to claim 59, characterized in that The battery (101) extends along the width direction of the battery compartment (10), and there are a plurality of batteries (101), and the plurality of batteries (101) are arranged along the length direction of the battery compartment (10). The surface of the battery (101) comprises two opposite first surfaces and four second surfaces arranged around the first surfaces, the area of ​​the first surfaces is larger than the area of ​​the second surfaces, a pole assembly is arranged on the first surfaces, and the length direction of the second surfaces extends along the width direction of the battery compartment (10).

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