Battery pack lower box, battery box, battery pack and vehicle

Abstract

The embodiment of the present utility model proposes a battery pack lower box, a battery box, a battery pack and a vehicle. Among them, the battery pack lower box includes a frame and a liquid cooling plate. The frame and the liquid cooling plate are connected by flow drilling, and a sealing layer is coated at the connection; the liquid cooling plate and the frame are provided with a fixing part away from the sealing layer, and the fixing part fixes the liquid cooling plate and the frame. The battery pack lower box of the embodiment of the utility model forms a sealing structure with the liquid cooling plate and the frame by the provided sealing layer, and the flow drilling connection fixes the liquid cooling plate and the frame, and then the liquid cooling plate and the frame are fixedly connected by the fixing part, which improves the connection strength between the liquid cooling plate and the frame and avoids the failure of the sealant due to mechanical working conditions. Therefore, the battery pack lower box of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

Description

Technical Field

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

[0002] At present, it has become a technological trend to integrate a liquid cooling plate into the lower box of the battery pack. In the related technology, the frame of the lower box of the battery pack is fixedly connected to the liquid cooling plate, and the joint between the frame and the liquid cooling plate is filled with sealant to seal and ensure air tightness. However, when the battery pack is subjected to harsh environments such as vibration and impact, the sealant will easily fail due to mechanical conditions, affecting its air tightness. For example, the frame of the lower box of the battery pack is connected to the liquid cooling plate by screws. When the battery pack collides, the frame and the liquid cooling plate shake, and the sealant at the interface between the frame and the liquid cooling plate is prone to cracking, affecting the sealing effect. Therefore, it is necessary to design a structure that can ensure reliable sealing of the connection interface. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a battery pack lower box. The battery pack lower box has the advantages of good sealing effect and high safety performance.

[0004] The embodiment of the utility model further provides a battery box.

[0005] An embodiment of the present invention further provides a battery pack.

[0006] An embodiment of the utility model further provides a vehicle.

[0007] The battery pack lower box of the embodiment of the utility model includes a frame and a liquid cooling plate.

[0008] The frame and the liquid cooling plate are connected by flow drilling, and a sealing layer is coated at the connection; a fixing part is arranged at the liquid cooling plate and the frame away from the sealing layer, and the fixing part fixes the liquid cooling plate and the frame.

[0009] It can be understood that the screws of the flow drill pass through the liquid cooling plate and the frame in sequence, the sealant layer seals the frame and the liquid cooling plate, and the fixing part fixes the liquid cooling plate and the frame.

[0010] The battery pack lower box of the embodiment of the utility model forms a sealing structure between the liquid cooling plate and the frame by setting a sealing glue layer, and fixes the frame and the liquid cooling plate by the flow drill connection, and then fixes the liquid cooling plate and the frame by the fixing part, thereby improving the connection strength between the liquid cooling plate and the frame, thereby preventing the screws of the flow drill connection from generating a pulling force along the radial direction of the battery pack lower box during vibration when the battery pack is in a harsh environment such as vibration, impact and collision, causing the glue layer between the liquid cooling plate and the frame to crack and cause the problem of poor sealing effect of the battery pack lower box. The fixing part between the liquid cooling plate and the frame fixes the two together, avoiding the problem of relative displacement of the liquid cooling plate and the frame caused by the pulling force generated by shaking.

[0011] Therefore, the battery pack lower box of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

[0012] In some embodiments, the fixing portion is a welding layer or a structural adhesive layer.

[0013] In some embodiments, the flow drill connection includes an FDS connection, and the frame and the liquid cooling plate are fixedly connected by FDS screws.

[0014] In some embodiments, the lower box of the battery pack further includes a bottom guard plate, which covers the side of the liquid cooling plate facing away from the frame, and the bottom guard plate is fixedly connected to the frame.

[0015] In some embodiments, the lower box of the battery pack also includes bolts, the frame is provided with rivet nuts, the bottom guard plate is provided with avoidance holes, and the liquid cooling plate is provided with avoidance portions in an area close to the edge, and the bolts pass through the avoidance holes and the avoidance portions and then cooperate with the rivet nuts.

[0016] In some embodiments, the avoidance portion is an avoidance gap opened in an area close to an edge of the liquid cooling plate.

[0017] In some embodiments, the structural adhesive layer includes a plurality of structural adhesive dots arranged in a breakpoint array.

[0018] In some embodiments, the width of the structural adhesive layer along the inner and outer directions of the battery pack is not less than 6 mm.

[0019] In some embodiments, the width of the sealant layer along the inner and outer directions of the battery pack is not less than 8 mm.

[0020] The battery box of the embodiment of the utility model comprises a box cover and a lower box body of the battery pack according to any one of the above, and the box cover is arranged on the frame.

[0021] The battery pack of the embodiment of the utility model may include a battery module and a battery box as described above, wherein the battery module is arranged in the battery box.

[0022] The vehicle of the embodiment of the utility model comprises a vehicle body and the battery pack described above, wherein the battery pack is arranged on the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded view of the lower box of the battery pack of an embodiment of the present utility model.

[0024] Figure 2 It is a partial cross-sectional view of the lower box of the battery pack of an embodiment of the utility model, and bolts are provided in this part.

[0025] Figure 3 yes Figure 2 A partial view of the .

[0026] Figure 4 It is a schematic diagram of the layout of the sealing adhesive layer and the structural adhesive layer of an embodiment of the utility model.

[0027] Figure 5 This is another partial cross-sectional view of the lower box of the battery pack of an embodiment of the utility model, in which FDS screws are provided and the bottom guard plate is omitted.

[0028] Figure 6 yes Figure 5 A partial view of the .

[0029] Reference numerals:

[0030] Battery pack lower box 100;

[0031] Frame 1; buffer energy absorbing portion 11; ear hanging portion 12; first reinforcing rib 13; energy absorbing cavity 14;

[0032] Liquid cooling plate 2; avoidance gap 21;

[0033] Bottom guard plate 3;

[0034] Pull rivet nut 41; rivet body 411; flange 412; bolt 42;

[0035] Structural adhesive layer 43; FDS screws 44; sealing adhesive layer 45. 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] Reference below Figure 1-Figure 6The battery pack lower case 100, the battery box, the battery pack and the vehicle according to the embodiments of the present invention are described.

[0038] The battery pack lower box 100 of the embodiment of the utility model includes a frame 1 and a liquid cooling plate 22, the frame 1 and the liquid cooling plate 2 are connected by flow drilling, and a sealing layer 45 is coated at the connection; a fixing part is provided at a position of the liquid cooling plate 2 and the frame 1 away from the sealing layer 45, and the fixing part fixes the liquid cooling plate 2 and the frame 1. Specifically, the sealing layer 45 is coated between the frame 1 and the liquid cooling plate 2 to seal the gap between the frame 1 and the liquid cooling plate 2.

[0039] The battery pack lower box 100 of the utility model embodiment forms a sealing structure between the liquid cooling plate 2 and the frame 1 by setting a sealing layer 45, and on the basis of fixing the frame 1 and the liquid cooling plate 2 by flow drill connection, the liquid cooling plate 2 and the frame 1 are fixedly connected by a fixing part, thereby improving the connection strength between the liquid cooling plate 2 and the frame 1, thereby preventing the screws of the flow drill connection from generating a pulling force in the radial direction of the battery pack lower box 100 during vibration when the battery pack is in a harsh environment such as vibration, impact and collision, causing the sealing layer 45 between the liquid cooling plate 2 and the frame 1 to crack and cause the problem of poor sealing effect of the battery pack lower box 100. The fixing part of the liquid cooling plate 2 and the frame 1 fixes the two together, avoiding the problem of relative displacement of the liquid cooling plate and the frame caused by the pulling force generated by shaking. As a result, the sealing of the battery pack lower box 100 is improved.

[0040] Therefore, the battery pack lower box 100 of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

[0041] It should be noted that, generally speaking, the sealant layer 45 mainly plays a sealing role, and its bonding strength is relatively low.

[0042] The fixing portion may be a welding layer or a structural adhesive layer 43. It is understandable that the liquid cooling plate 2 and the frame 1 may be fixed by welding or by setting a structural adhesive bonding method. Thus, the welding or bonding connection method helps to improve the convenience of assembling the frame 1 and the liquid cooling plate 2.

[0043] For example, when the fixing portion is a structural adhesive layer 43, the structural adhesive layer 43 is connected and fixed between the frame 1 and the liquid cooling plate 2. Optionally, the structural adhesive layer 43 is arranged near the inner side of the battery pack lower box 100 relative to the sealant layer 45. It is understandable that the structural adhesive layer 43 is arranged on the inner side of the sealant layer 45.

[0044] The battery pack lower box 100 of the embodiment of the utility model cooperates with the structural adhesive layer 43 and the sealing adhesive layer 45. Even if the sealing adhesive layer 45 located on the outside fails, the structural adhesive layer 43 can still play a certain sealing role. Therefore, the possibility of a gap between the liquid cooling plate 2 and the frame 1 is greatly reduced. Therefore, water vapor, dust and other media are completely isolated from entering the frame 1, and the battery pack lower box 100 of the embodiment of the utility model further improves the sealing effect and safety performance.

[0045] The flow drill connection includes an FDS connection, and the frame 1 and the liquid cooling plate 2 can be fixedly connected by FDS screws 44.

[0046] like Figure 2 and Figure 3 As shown, the battery pack lower box 100 of the embodiment of the utility model further includes a bottom guard plate 3, which covers the side of the liquid cooling plate 2 away from the frame 1, and the bottom guard plate 3 is fixedly connected to the frame 1. Specifically, as Figure 3 As shown, the liquid cooling plate 2 is clamped between the bottom guard plate 3 and the frame 1 .

[0047] The battery pack lower box 100 of the embodiment of the utility model can protect the liquid cooling plate 2 through the bottom guard plate 3 to prevent the liquid cooling plate 2 from being damaged in a collision. Therefore, the battery pack lower box 100 has the advantage of improving the structural strength of the lower box.

[0048] Specifically, the main function of the bottom guard plate 3 is to provide protection for the bottom of the battery pack to prevent the bottom of the battery pack from being hit and damaged during driving. The liquid cooling plate 2 not only performs heat exchange on the battery module to control the temperature of the battery, but also seals the bottom of the frame 1 of the lower box to prevent the battery module from contacting with water and other media outside.

[0049] like Figure 2 and Figure 3 As shown, the battery pack lower box 100 of the utility model embodiment also includes a bolt 42, a rivet nut 41 is provided on the frame 1, an avoidance hole is opened on the bottom guard plate 3, and an avoidance portion is opened in the area near the edge of the liquid cooling plate 2. The bolt 42 passes through the avoidance hole and the avoidance portion and cooperates with the rivet nut 41.

[0050] The battery pack lower box 100 of the embodiment of the utility model fixes the bottom guard plate 3 and the frame 1 by further providing bolts 42, and the bottom guard plate 3 and the frame 1 exert a holding force on the liquid cooling plate 2 to tighten the liquid cooling plate 2, so that the liquid cooling plate 2 can be more firmly sandwiched between the bottom guard plate 3 and the frame 1. In addition, the sealing performance between the liquid cooling plate 2 and the frame 1 is improved.

[0051] Furthermore, the avoidance portion may be opened in a region close to the edge of the liquid cooling plate 2 so as to form an avoidance gap 21 in the region.

[0052] When the battery pack is in a harsh environment such as vibration, impact and collision, the bolt 42 is gapped through the avoidance gap 21. The inclined bolt 42 after the impact and collision will not directly pull the liquid cooling plate 2, that is, the bolt 42 will not generate a pulling force on the liquid cooling plate 2 along the radial direction of the lower box 100 of the battery pack, thereby making the liquid cooling plate 2 less susceptible to the force along the width and / or length direction of the lower box, resulting in severe cracking and sealing failure. Therefore, the battery pack lower box 100 of the embodiment of the utility model greatly improves the safety performance of the battery pack. In addition, the bolt 42 is gapped through the avoidance gap 21. It can be understood that there is a gap between the avoidance gap 21 and the bolt 42, which can avoid the part of the bolt 42 located between the bottom guard plate 3 and the frame 1 from having structural interference with the liquid cooling plate 2. The gap can absorb the manufacturing tolerances of each structure and improve the overall assembly yield of the battery box.

[0053] Therefore, the battery pack lower box 100 of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

[0054] Optionally, there is a gap between the avoidance notch 21 and the bolt 42, and the width of the gap may be 0.5 mm-1.5 mm, thereby further improving the overall assembly yield of the battery box.

[0055] like Figure 2 and Figure 3 As shown, the flange 412 of the rivet nut 41 is clamped between the frame 1 and the bottom guard plate 3, and the bolt 42 is passed through the bottom guard plate 3, the avoidance notch 21 and the rivet body of the rivet nut 41 in sequence. It can be understood that the bottom guard plate 3 is detachably connected to the frame 1 through the bolt 42.

[0056] The battery pack lower box 100 of the embodiment of the utility model is detachably connected to the liquid cooling plate 2 by bolts 42, and the bottom guard plate 3 can be independently disassembled and assembled, thereby improving the maintainability of the battery pack and reducing the after-sales maintenance cost of the battery pack lower box 100.

[0057] Going a step further, Figure 2 and Figure 3 As shown, the rivet nut 41 includes a connected rivet body 411 and a flange 412 extending outward along the outer peripheral wall of the rivet body 411, the flange 412 is clamped between the frame 1 and the bottom guard plate 3, the rivet body 411 is passed through the frame 1, and a threaded hole is provided on the rivet body 411, and the fixing bolt 42 is threadedly matched with the inner wall surface of the threaded hole.

[0058] The battery pack lower box 100 of the embodiment of the utility model is divided into a connected rivet body 411 and a flange 412 extending outward along the outer peripheral wall of the rivet body 411 through a rivet nut 41. The flange 412 can abut against the avoidance gap 21 to fill the gap between the bottom guard plate 3 and the frame 1 in the avoidance gap 21. The shaking between the frame 1 and the bottom guard plate 3 can be reduced (because the shaking easily causes the bolt 42 to loosen). Therefore, the battery pack lower box 100 has the advantages of simple structure and good stability.

[0059] Optionally, anti-slip teeth are provided on the lower surface of the flange portion 412, and an anti-rotation outer pattern is provided on the outer periphery of the rivet body, thereby achieving a good anti-rotation effect, effectively avoiding the occurrence of loosening, and significantly improving the riveting tightness.

[0060] The structural adhesive layer 43 includes a plurality of structural adhesive dots arranged in a breakpoint array.

[0061] The battery pack lower box 100 of the present utility model embodiment can avoid the problem of air holes and glue shortage caused by the exhaust space being blocked during the glue pressing process, resulting in the glue bonding area of ​​the structural glue points, by dividing the structural glue layer 43 into a plurality of structural glue points arranged in a breakpoint array. The setting of the structural glue points arranged in a breakpoint array can not only keep the exhaust space open, but also improve the connection strength and bonding uniformity of the assembly interface. Therefore, the battery pack lower box 100 has the advantage of helping to improve the sealing performance.

[0062] The width of the structural adhesive layer 43 along the inner and outer directions of the battery pack is not less than 6 mm.

[0063] The battery pack lower box 100 of the embodiment of the utility model has a width of the structural adhesive layer 43 along the inner and outer directions of the battery pack of not less than 6mm. If the width of the structural adhesive layer 43 is too small, it is easy to crack when the battery pack is hit or vibrated. The battery pack lower box 100 has the advantage of good structural stability and can be used in harsh environments such as vibration and impact.

[0064] like Figure 3 As shown, the width of the sealant layer 45 along the inner and outer directions of the battery pack is greater than or equal to 8 mm.

[0065] The battery pack lower box 100 of the utility model embodiment has a width w of the sealant layer 45 along the inner and outer directions of the battery pack that is greater than or equal to 8 mm. If the width of the sealant layer 45 is too small, it is easy to crack when the battery pack is hit or vibrated. Setting the width of the sealant layer 45 to be greater than or equal to 8 mm has the advantage of good sealing stability for most glues (whose elongation at break is greater than 300%). Therefore, the battery pack lower box 100 has the advantage of good structural stability, and it can be used in harsh environments such as vibration and impact.

[0066] Specifically, the sealant layer 45 can be a single-component modified silane or hybrid system glue layer. Such glue generally has a low bonding strength of only 2-3 MPa and a breaking elongation greater than 300%, and can meet sealing requirements in harsh environments such as vibration and impact.

[0067] Optionally, the sealant layer 45 is arranged in a ring shape along the circumference of the frame 1, so that the liquid cooling plate 2 forms a complete seal on the frame 1 through the sealant layer 45, completely isolating media such as water vapor and dust from entering the frame 1, and thus the battery pack lower box 100 of the embodiment of the utility model further improves the sealing effect and safety performance.

[0068] like Figure 2 and Figure 5 As shown, the frame 11 includes a buffering energy absorbing portion 11 and a hanging ear portion 12, and the hanging ear portion 12 is arranged on the outside of the buffering energy absorbing portion 11. This improves the anti-collision performance of the lower box 100 of the battery pack, thereby reducing the risk of thermal runaway of the battery pack.

[0069] Alternatively, if Figure 2 and Figure 5 As shown, the buffering energy absorbing part 11 has an energy absorbing cavity 14, the energy absorbing cavity 14 is provided with a first reinforcing rib 13, and the rivet nut 41 is inserted into the energy absorbing cavity 14. Therefore, the battery pack lower box 100 has the advantages of good energy absorption effect and high structural stability. The embodiment of the utility model is not limited to this, and the buffering energy absorbing part 11 can also be attached to the buffering energy absorbing layer on the frame 11.

[0070] The battery box of the embodiment of the utility model comprises a box cover and a battery pack lower box body 100 according to any one of the above items, and the box cover is arranged on the frame 1.

[0071] Therefore, the battery box of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

[0072] The battery pack of the embodiment of the utility model may include a battery module and a battery box according to the above, and the battery module is arranged in the battery box.

[0073] Therefore, the battery pack of the embodiment of the utility model has the advantages of good sealing effect and high safety performance.

[0074] The vehicle of the embodiment of the utility model comprises a vehicle body and the battery pack described above, wherein the battery pack is arranged on the vehicle body. Therefore, the vehicle of the embodiment of the utility model has the advantage of good sealing effect.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery pack lower box, characterized in that: include: A frame and a liquid cooling plate, wherein the frame and the liquid cooling plate are connected by flow drilling, and a sealing adhesive layer is coated at the connection; The liquid cooling plate and the frame are provided with fixing parts away from the sealing adhesive layer, and the fixing parts fix the liquid cooling plate and the frame.

2. The battery pack lower box according to claim 1, characterized in that: The fixing portion is a welding layer or a structural adhesive layer.

3. The battery pack lower box according to claim 1, characterized in that: The flow drill connection includes an FDS connection, and the frame and the liquid cooling plate are fixedly connected by FDS screws.

4. The battery pack lower box according to claim 1, characterized in that: It also includes a bottom guard plate, which covers the side of the liquid cooling plate away from the frame, and the bottom guard plate is fixedly connected to the frame.

5. The battery pack lower box according to claim 4, characterized in that: It also includes a bolt, the frame is provided with a rivet nut, the bottom guard plate is provided with an avoidance hole, the liquid cooling plate is provided with an avoidance portion, and the bolt passes through the avoidance hole and the avoidance portion and then cooperates with the rivet nut; The avoidance portion is an avoidance gap opened in an area close to the edge of the liquid cooling plate.

6. The battery pack lower box according to claim 2, characterized in that: The structural adhesive layer includes a plurality of structural adhesive points arranged in a breakpoint array, and / or the width of the structural adhesive layer along the inner and outer directions of the battery pack is not less than 6 mm.

7. The battery pack lower box according to any one of claims 1 to 6, characterized in that: The width of the sealant layer along the inner and outer directions of the battery pack is not less than 8 mm.

8. A battery box, characterized in that: It comprises a box cover and a lower box body of a battery pack according to any one of claims 1 to 7, wherein the box cover is arranged on the frame.

9. A battery pack, characterized in that: The invention comprises a battery module and a battery box according to claim 8, wherein the battery module is arranged in the battery box.

10. A vehicle, characterized in that: The invention comprises a vehicle body and a battery pack according to claim 9, wherein the battery pack is arranged on the vehicle body.

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