Battery boxes, battery packs and vehicles

Abstract

The utility model discloses a battery box, a battery pack and a vehicle, wherein the battery box comprises a bottom guard plate, a bottom cold plate and a support beam, wherein the bottom guard plate is a sheet metal plate, the support beam is arranged between the bottom guard plate and the bottom cold plate, and the support beam is connected to each of the bottom guard plate and the bottom cold plate. The battery box provided by the utility model has the advantages that the bottom guard plate is not easily deformed when impacted by foreign objects, the probability of the bottom cold plate being touched by the bottom guard plate is low, the risk of deformation or even failure of the battery cells in the battery pack due to stress is low, and less space in the Z direction of the battery pack is occupied.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a battery box, a battery pack and a vehicle. Background Art

[0002] The battery pack is one of the core components of electric vehicles. The bottom safety of the battery pack is a key mechanical performance indicator of the battery pack, and its reliability is directly related to the safety performance of the battery pack. The battery pack is inevitably impacted by foreign objects during the driving process of the vehicle. In mild cases, it may cause the bottom of the battery pack to deform. In severe cases, it may cause the bottom guard plate to rupture, the battery pack to fail to be airtight, the battery cell to deform due to stress, and even cause fire and explosion, which threatens personal safety.

[0003] The bottom structure of the battery pack in the related art usually includes a bottom cold plate and a bottom guard plate, both of which are connected to the frame of the battery box and arranged at intervals in the height direction. In order to avoid the above defects, the sheet metal bottom guard plate is usually replaced with a profile bottom guard plate to improve the strength and rigidity of the bottom guard plate. However, the profile bottom guard plate is formed by an extrusion process, and a cavity is formed inside, resulting in the minimum thickness of the profile bottom guard plate being much greater than the thickness of the sheet metal bottom guard plate, which in turn causes the profile bottom guard plate to occupy more space in the Z direction (height direction) and the battery pack space utilization rate is low. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the utility model proposes a battery box, which has the advantages that the bottom guard plate is not easily deformed when impacted by foreign objects, the probability of the bottom cold plate being touched by the bottom guard plate is low, the risk of the battery cells in the battery pack being deformed or even failing due to force is low, and less space in the Z direction of the battery pack is occupied.

[0006] The embodiments of the present invention also provide a battery pack and a vehicle.

[0007] The battery box of the embodiment of the utility model includes a bottom guard plate, a bottom cold plate and a support beam, the bottom guard plate is a sheet metal plate, the support beam is arranged between the bottom guard plate and the bottom cold plate, and the support beam is connected to each of the bottom guard plate and the bottom cold plate.

[0008] According to the battery box of the embodiment of the utility model, the bottom guard plate is connected to the support beam, and the support beam is connected to the bottom cold plate, so that the bottom cold plate, the support beam and the bottom guard plate are connected as a whole. When the bottom guard plate is impacted by foreign objects, the support beam can effectively offset part of the impact force from the bottom guard plate, and the bottom cold plate can effectively offset part of the impact force transmitted to the support beam. Then, under the joint support of the bottom cold plate and the support beam, the bottom guard plate can withstand greater impact force without deformation, thereby effectively reducing the probability of the bottom guard plate deforming and touching the bottom cold plate, and effectively reducing the probability of the bottom cold plate being deformed by the bottom guard plate, thereby effectively reducing the risk of the battery cells in contact with the bottom cold plate being deformed or even failing, and the battery pack has high safety in use.

[0009] Moreover, compared with the profile bottom guard plate in the related art, the bottom guard plate made of sheet metal in this embodiment has a smaller thickness, occupies less Z-direction space of the battery pack, and has a higher space utilization rate of the battery pack.

[0010] In some embodiments, the support beams are bonded to the bottom cold plate.

[0011] In some embodiments, the battery case also includes a support member, which is connected to the support beam, at least part of the support member protrudes from the upper surface of the support beam and is bonded to the bottom cold plate, the support beam is spaced apart from the bottom cold plate, and the bonding area between the support member and the bottom cold plate is smaller than the area of ​​the upper surface of the support beam.

[0012] In some embodiments, the support beam includes a top plate adjacent to the bottom cold plate and a bottom plate adjacent to the bottom guard plate, and a first mounting hole is provided on the top plate;

[0013] The support member includes a support column, which is loosely fitted in the first mounting hole and abuts against a surface of the bottom plate facing the top plate, and at least a portion of the support column protrudes from an upper surface of the top plate.

[0014] In some embodiments, the surface of the support column facing the bottom cold plate is provided with a glue coating groove;

[0015] And / or, the support member includes at least two support columns, and all the support columns are arranged at intervals along the extension direction of the support beam.

[0016] In some embodiments, a threaded hole is provided on the lower surface of the support column, a second mounting hole is provided on the base plate, a third mounting hole is provided on the bottom guard plate, and a threaded member passes through the third mounting hole and the second mounting hole and is threadedly matched with the threaded hole.

[0017] In some embodiments, a liquid cooling channel and a positioning hole are provided on the bottom cold plate, the liquid cooling channel and the positioning hole are spaced apart in the extension direction of the bottom cold plate, and a positioning pin is provided on the support member, and the positioning pin is fitted in the positioning hole.

[0018] In some embodiments, the bottom guard plate is provided with reinforcing ribs, and the extending direction of the reinforcing ribs is at an angle to the extending direction of the supporting beam; wherein,

[0019] There are at least two reinforcing ribs, and all of the reinforcing ribs are arranged at intervals along the extension direction of the support beam, and / or there are at least two support beams, and all of the support beams are arranged at intervals along the extension direction of the reinforcing ribs.

[0020] The battery pack according to an embodiment of the present invention includes a battery box as described in any of the above embodiments.

[0021] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the battery box of the above-mentioned embodiment, which will not be repeated here.

[0022] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0023] The technical advantages of the vehicle according to the present new embodiment are the same as the technical advantages of the battery pack of the above-mentioned embodiment, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded view of a battery box according to an embodiment of the utility model.

[0025] Figure 2 It is a partial cross-sectional view of a battery box at a support column according to an embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of the bottom guard plate of the battery box according to an embodiment of the utility model.

[0027] Figure 4 It is a bottom view of the bottom cold plate of the battery box according to the embodiment of the utility model.

[0028] Figure 5 It is a cross-sectional view of a bottom cold plate in a battery box according to an embodiment of the utility model.

[0029] Figure 6 It is a schematic diagram of a support beam in a battery box according to an embodiment of the utility model.

[0030] Figure 7 It is another schematic diagram of the support beam in the battery box according to an embodiment of the utility model.

[0031] Figure 8 It is a schematic diagram of a support column in a battery box according to an embodiment of the utility model.

[0032] Fig. 9 It is another schematic diagram of the support column in the battery box according to an embodiment of the utility model.

[0033] Fig.10 It is a cross-sectional view of a support column in a battery box according to an embodiment of the utility model.

[0034] Reference numerals:

[0035] 1. Bottom guard plate; 11. Reinforcement ribs; 12. Third mounting hole; 2. Bottom cold plate; 21. Positioning hole; 22. Liquid cooling channel; 3. Support beam; 31. Top plate; 311. First mounting hole; 32. Bottom plate; 321. Second mounting hole; 4. Support column; 41. Positioning pin; 42. Glue groove; 43. Threaded hole; 5. Threaded part; 6. Frame. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0037] Combine the following Figure 1-Figure 10 A battery box according to an embodiment of the utility model is described.

[0038] The battery box of the embodiment of the utility model comprises a bottom guard plate 1, a bottom cold plate 2 and a support beam 3, wherein the bottom guard plate 1 is a sheet metal plate, the support beam 3 is arranged between the bottom guard plate 1 and the bottom cold plate 2, and the support beam 3 is connected to each of the bottom guard plate 1 and the bottom cold plate 2. The bottom guard plate 1 and the bottom cold plate 2 are both threadedly connected to the frame 6 of the battery box by bolts, and the bottom guard plate 1 is located below the bottom cold plate 2 and is spaced apart from the bottom cold plate 2.

[0039] According to the battery box of the embodiment of the utility model, the bottom guard plate 1 is connected to the support beam 3, and the support beam 3 is connected to the bottom cold plate 2, so that the bottom cold plate 2, the support beam 3 and the bottom guard plate 1 are connected as a whole. When the bottom guard plate 1 is impacted by a foreign object, the support beam 3 can effectively offset part of the impact force from the bottom guard plate 1, and the bottom cold plate 2 can effectively offset part of the impact force transmitted to the support beam 3. Then, under the joint support of the bottom cold plate 2 and the support beam 3, the bottom guard plate 1 can withstand a greater impact force without deformation, thereby effectively reducing the probability of the bottom guard plate 1 deforming and touching the bottom cold plate 2, and effectively reducing the probability of the bottom cold plate 2 being deformed by the bottom guard plate 1, thereby effectively reducing the risk of the battery cells in contact with the bottom cold plate 2 being deformed or even failing, and the battery pack has high safety in use.

[0040] Moreover, compared with the profile bottom guard plate in the related art, the bottom guard plate 1 made of sheet metal in this embodiment has a smaller thickness, occupies less Z-direction space of the battery pack, and has a higher space utilization rate of the battery pack.

[0041] It should be noted that the extension direction of the support beam 3 can be the width direction, length direction and other horizontal directions of the bottom guard plate 1. The number of support beams 3 can be at least two, and all support beams 3 are arranged at intervals in a direction perpendicular to their extension direction, thereby effectively suppressing deformation of more positions of the bottom guard plate 1. For example, Figure 1 As shown, the support beam 3 is a cross beam, and there are two support beams 3 . The two ends of each support beam 3 are respectively adjacent to the two edges in the width direction of the bottom guard plate 1 , and the two support beams 3 are distributed in the central area of ​​the bottom guard plate 1 along the length direction of the bottom guard plate 1 .

[0042] In some embodiments, the support beam 3 is bonded to the bottom cold plate 2 .

[0043] At this time, compared with welding, the bonding of the support beam 3 and the bottom cold plate 2 eliminates welding deformation, welding stress, and the risk of welding penetration and welding leakage. Compared with screwing, it also saves the process of processing mounting holes on the bottom cold plate 2. The design of not processing mounting holes also effectively ensures the strength and rigidity of the bottom cold plate 2.

[0044] Specifically, the support beam 3 can be bonded to the bottom cold plate 2 by structural adhesive or by double-sided adhesive. The connection between the support beam 3 and the bottom cold plate 2 is convenient and has low connection cost.

[0045] In some embodiments, Figure 2 As shown, the battery box also includes a support member, which is connected to the support beam 3, at least part of the support member protrudes from the upper surface of the support beam 3 and is bonded to the bottom cold plate 2, the support beam 3 is separated from the bottom cold plate 2, and the bonding area between the support member and the bottom cold plate 2 is smaller than the area of ​​the upper surface of the support beam 3.

[0046] The support beam 3 is spaced apart from the bottom cold plate 2, that is, the maximum dimension of the support beam 3 in the height direction is smaller than the distance between the lower surface of the bottom cold plate 2 and the upper surface of the bottom guard plate 1, thereby effectively preventing over-constraint. Moreover, the bonding area between the support member and the bottom cold plate 2 is smaller than the area of ​​the upper surface of the support beam 3, that is, the heat exchange area between the support beam 3 and the bottom cold plate 2 is smaller, thereby effectively improving the cooling efficiency of the bottom cold plate 2 on the battery cell.

[0047] Specifically, the distance between the upper surface of the support beam 3 and the lower surface of the bottom cold plate 2 is 0.2mm-0.5mm. The above setting ensures that the upper surface of the support beam 3 does not fit in contact with the lower surface of the bottom cold plate 2, and also ensures that the thickness of the support beam 3 is not too small to affect its strength and rigidity.

[0048] Exemplarily, the distances between the upper surface of the support beam 3 and the lower surface of the bottom cold plate 2 are 0.2 mm, 0.3 mm and 0.5 mm.

[0049] In some embodiments, Figure 2 and Figure 6 As shown, the support beam 3 includes a top plate 31 adjacent to the bottom cold plate 2 and a bottom plate 32 adjacent to the bottom guard plate 1, and a first mounting hole 311 is provided on the top plate 31. The support member includes a support column 4, which is loosely fitted in the first mounting hole 311 and abuts against the surface of the bottom plate 32 facing the top plate 31, and at least a portion of the support column 4 protrudes from the upper surface of the top plate 31.

[0050] The support column 4 is fitted into the first mounting hole 311 and abutted against the surface of the bottom plate 32 facing the top plate 31, that is, the upper surface, so that the support column 4 is positioned on the support beam 3, which facilitates the subsequent connection between the support column 4 and the support beam 3. At the same time, the upper surface of the bottom plate 32 can be used as a reference surface to ensure that after the upper surface of the support column 4 is bonded to the lower surface of the bottom cold plate 2, the support beam 3 and the bottom cold plate 2 remain in a non-contact state.

[0051] Specifically, the support column 4 includes a first shaft section and a second shaft section connected in sequence from bottom to top, the first shaft section is located between the bottom plate 32 and the top plate 31, the lower end surface of the first shaft section abuts against the upper surface of the bottom plate 32, and the second shaft section is loosely fitted in the first mounting hole 311. The diameter of the first shaft section is smaller than the diameter of the second shaft section to reduce the weight and cost of the support column 4. The aperture of the first mounting hole 311 is larger than the diameter of the second shaft section and can be 30mm, 34mm and 36mm. The support beam 3 is made of aluminum extruded profile or rolled steel profile, and is a "mouth" beam, and the surface of the bottom plate 32 facing the top plate 31 is its inner surface.

[0052] In some embodiments, a glue coating groove 42 is provided on a surface of the support column 4 facing the bottom cold plate 2 .

[0053] The glue coating groove 42 is used to accommodate the structural glue. The design of the glue coating groove 42 effectively increases the bonding area between the support column 4 and the bottom cold plate 2, thereby effectively ensuring the connection strength between the support column 4 and the bottom cold plate 2.

[0054] like Figure 8 and Fig.10 As shown, the glue coating groove 42 is an annular groove, and there are three annular grooves arranged coaxially, and the three annular grooves are arranged at intervals along the radial direction of the support column 4.

[0055] The support member includes at least two support columns 4, and all the support columns 4 are arranged at intervals along the extension direction of the support beam 3. That is, each support beam 3 is bonded to the bottom cold plate 2 through at least two support columns 4, which effectively ensures the connection strength between the support beam 3 and the bottom cold plate 2, and also effectively avoids the bottom cold plate 2 being deformed and damaged by excessive pressure from the support columns 4 due to the small contact area between the support beam 3 and the bottom cold plate 2.

[0056] Specifically, Figure 1 As shown, each support beam 3 corresponds to four support columns 4 , and the four support columns 4 are arranged at equal intervals along the extension direction of the support beam 3 .

[0057] In some embodiments, Figure 2 , Figure 3 and Figure 7 As shown, a threaded hole 43 is provided on the lower surface of the support column 4, a second mounting hole 321 is provided on the bottom plate 32, a third mounting hole 12 is provided on the bottom guard plate 1, and the threaded member 5 passes through the third mounting hole 12, the second mounting hole 321 and is threadedly matched with the threaded hole 43.

[0058] That is, the support column 4 , the support beam 3 and the bottom guard plate 1 are connected by the same screw member 5 , which effectively improves the assembly efficiency between each of the support column 4 and the bottom guard plate 1 and the support beam 3 .

[0059] Specifically, the diameter of the second mounting hole 321 is smaller than the diameter of the first shaft section in the support column 4, and the diameter of the second mounting hole 321 and the diameter of the third mounting hole 12 are both larger than the diameter of the threaded hole 43. The diameter of the second mounting hole 321 can be 7.5 mm, 8 mm, and 8.5 mm, and the diameter of the third mounting hole 12 can be 6.5 mm, 7 mm, and 7.5 mm. The threaded member 5 is a bolt, which passes through the third mounting hole 12 and the second mounting hole 321 in sequence and is threadedly matched with the threaded hole 43.

[0060] In some embodiments, Figure 2 , Figure 4 and Figure 8 As shown, one of the support member and the bottom cold plate 2 is provided with a positioning pin 41 , and the other of the support member and the bottom cold plate 2 is provided with a positioning hole 21 , and the positioning pin 41 is fitted in the positioning hole 21 .

[0061] The cooperation between the positioning pin 41 and the positioning hole 21 facilitates the rapid alignment of the support column 4 on the bottom cold plate 2, effectively ensures the installation accuracy of the support column 4 on the bottom cold plate 2, and effectively improves the subsequent assembly efficiency between the support column 4 and the support beam 3 and the bottom guard plate 1.

[0062] Specifically, Figure 2 As shown, a liquid cooling channel 22 and a positioning hole 21 are provided on the bottom cold plate 2 , and the liquid cooling channel 22 and the positioning hole 21 are spaced apart in the extension direction of the bottom cold plate 2 .

[0063] In some embodiments, Figure 1 and Figure 3 As shown, a reinforcing rib 11 is provided on the bottom guard plate 1 , and the extending direction of the reinforcing rib 11 forms an angle with the extending direction of the supporting beam 3 .

[0064] The design of the reinforcing ribs 11 further improves the strength of the bottom guard plate 1 , and combined with the support beams 3 intersecting therewith, further improves the overall stiffness of the bottom guard plate 1 and the support beams 3 , further enhancing the bottom ball impact protection capability.

[0065] Specifically, the reinforcing ribs 11 extend along the length direction of the bottom guard plate 1, and the extending direction of the reinforcing ribs 11 is perpendicular to the extending direction of the supporting beam 3, that is, the reinforcing ribs 11 and the supporting beam 3 form a "cross" structure. There are four reinforcing ribs 11 and they are arranged at intervals along the width direction of the bottom guard plate 1.

[0066] The battery pack according to an embodiment of the present invention includes a battery box as described in any of the above embodiments.

[0067] The technical advantages of the battery pack according to the embodiment of the utility model are the same as the technical advantages of the battery box of the above-mentioned embodiment, which will not be repeated here.

[0068] A vehicle according to an embodiment of the present invention includes a battery pack as described in the above embodiment.

[0069] The technical advantages of the vehicle according to the present new embodiment are the same as the technical advantages of the battery pack of the above-mentioned embodiment, and will not be repeated here.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery box, characterized in that: The invention comprises a bottom guard plate, a bottom cold plate and a support beam, wherein the bottom guard plate is a sheet metal plate, the support beam is arranged between the bottom guard plate and the bottom cold plate, and the support beam is connected to each of the bottom guard plate and the bottom cold plate.

2. The battery box according to claim 1, characterized in that: The support beam is bonded to the bottom cold plate.

3. The battery box according to claim 2, characterized in that: The battery box also includes a support member, which is connected to the support beam, at least part of the support member protrudes from the upper surface of the support beam and is bonded to the bottom cold plate, the support beam is spaced apart from the bottom cold plate, and the bonding area between the support member and the bottom cold plate is smaller than the area of ​​the upper surface of the support beam.

4. The battery box according to claim 3, characterized in that: The support beam comprises a top plate adjacent to the bottom cold plate and a bottom plate adjacent to the bottom guard plate, wherein a first mounting hole is provided on the top plate; The support member includes a support column, which is loosely fitted in the first mounting hole and abuts against a surface of the bottom plate facing the top plate, and at least a portion of the support column protrudes from an upper surface of the top plate.

5. The battery box according to claim 4, characterized in that: The surface of the support column facing the bottom cold plate is provided with a glue coating groove; And / or, the support member includes at least two support columns, and all the support columns are arranged at intervals along the extension direction of the support beam.

6. The battery box according to claim 4, characterized in that: A threaded hole is provided on the lower surface of the support column, a second mounting hole is provided on the bottom plate, a third mounting hole is provided on the bottom guard plate, and a threaded member passes through the third mounting hole and the second mounting hole and is threadedly matched with the threaded hole.

7. The battery box according to claim 3, characterized in that: The bottom cold plate is provided with a liquid cooling channel and a positioning hole, the liquid cooling channel and the positioning hole are spaced apart in the extension direction of the bottom cold plate, the support member is provided with a positioning pin, and the positioning pin is fitted in the positioning hole.

8. The battery case according to any one of claims 1 to 7, characterized in that: The bottom guard plate is provided with reinforcing ribs, and the extending direction of the reinforcing ribs is at an angle to the extending direction of the supporting beam; wherein, There are at least two reinforcing ribs, and all of the reinforcing ribs are arranged at intervals along the extension direction of the support beam, and / or there are at least two support beams, and all of the support beams are arranged at intervals along the extension direction of the reinforcing ribs.

9. A battery pack, characterized in that: Comprising a battery case according to any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the battery pack according to claim 9.

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