A tray, a battery pack and an electric device

Abstract

The embodiment of the application provides a tray, a battery pack and an electric equipment, relates to the technical field of the battery pack, and the tray comprises a tray body and a lifting lug module, opposite two sides of the tray body are provided with first side beams, a plurality of lifting lug modules are integrally formed on the side of the two first side beams which is away from each other, and the plurality of lifting lug modules are arranged at intervals along the extension direction of the first side beam.Through integrally forming the first side beam and the plurality of same lifting lug modules, the development cost of the mold can be effectively reduced, the processing steps of the tray can be simplified, and the cost of mass production of the tray is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a tray, a battery pack and an electric equipment. BACKGROUND

[0002] The power battery pack is a key component for storing and providing electric energy in electric vehicles, hybrid vehicles, electric tools and other electric devices. The power battery pack generally includes a battery module, a tray and a cover plate, and the cover plate is sealingly connected with the tray to accommodate the space of the battery module.

[0003] Among them, the tray is connected with the device using the power battery pack, which is a relatively important component in the power battery pack. Specifically, the lug beams are connected on the two side beams of the tray in a welding or riveting manner, and a plurality of lugs are arranged on the lug beams, and the lugs are connected with the device using the power battery pack.

[0004] In the above-mentioned manner, the lug beams and lugs need to be arranged on the tray, which makes the processing process of the tray complex and the production cost of the tray high. SUMMARY

[0005] The embodiments of the present application provide a tray, a battery pack and an electric equipment to achieve the effect of simplifying the processing process of the tray and reducing the production cost of the tray.

[0006] In a first aspect, the embodiments of the present application provide a tray, comprising a tray body and a lug module, the opposite two sides of the tray body are provided with first side beams, the two first side beams are integrally formed with a plurality of lug modules on the side away from each other, and the plurality of lug modules are arranged in intervals along the extension direction of the first side beam.

[0007] In some possible implementation manners, the lug module comprises a lug portion and at least one connecting portion arranged on the lug portion, and the lug portion and the connecting portion are connected with the first side beam.

[0008] In some possible implementation manners, the lug portion comprises a lug sleeve and at least two lug reinforcing ribs, the lug sleeve is connected with the first side beam, the lug sleeve is provided with a connecting hole for inserting a bolt, one end of the lug reinforcing rib is connected with the lug sleeve, and the other end is connected with the connecting portion.

[0009] In some possible implementation manners, the connecting portion is a first connecting plate, and two connecting portions are arranged on the two sides of the lug portion.

[0010] In some possible embodiments, the first side beam comprises a side beam body and a first connecting piece arranged on the side beam body, the first connecting piece has the same extending direction as the side beam body, the first connecting piece is provided with a through hole matched with the connecting hole, the lug sleeve, the lug reinforcing rib and the connecting part are connected with the first connecting piece, and the connecting part is further connected with the side beam body.

[0011] In some possible embodiments, the connecting part is provided with an inclined surface on the side away from the first connecting piece, and the inclined surface is located at the end of the connecting part away from the side beam body.

[0012] In some possible embodiments, the included angle between the connecting part and the first connecting piece is 45°-90°.

[0013] In some possible embodiments, the side beam body is provided with a second connecting piece and at least one third connecting piece, the second connecting piece has the same extending direction as the side beam body, the third connecting piece is connected with the second connecting piece and the first connecting piece respectively, and the lug module is located on the side of the first connecting piece away from the second connecting piece.

[0014] In some possible embodiments, the third connecting piece is arranged in one-to-one correspondence with the lug part, the third connecting piece comprises two oppositely arranged first rib plates, one end of the first rib plate is connected with the first connecting piece, and the other end is connected with the second connecting piece.

[0015] In some possible embodiments, the included angle between the first rib plate and the first connecting piece is 30°-90°.

[0016] In some possible embodiments, the first rib plate is provided with at least one lightening groove on the side away from the side beam body.

[0017] In some possible embodiments, the first connecting piece is provided with a plurality of avoiding grooves arranged at intervals on the side away from the side beam body, a mounting part is formed between adjacent avoiding grooves, a projection of the second connecting piece on the first connecting piece is located in the mounting part, and the lug sleeve and the connecting part are connected with the mounting part.

[0018] In some possible embodiments, the tray body further comprises a liquid cooling plate and two second side beams, the two second side beams are connected with two ends of the first side beam respectively, and the first side beam and the second side beam are arranged around the circumferential side of the liquid cooling plate to form an accommodating part around the liquid cooling plate.

[0019] In some possible embodiments, the first side beam is provided with a boss for connecting with the liquid cooling plate on the side facing the accommodating part.

[0020] In some possible embodiments, the tray body further comprises at least one intermediate cross beam, two ends of the intermediate cross beam correspondingly connected with the two first side beams, and a top of the intermediate cross beam integrally formed with at least one cross beam lug.

[0021] In some possible embodiments, the intermediate cross beam comprises a cross beam body and a support portion, the cross beam body and the support portion have the same extension direction, and each side of the extension direction of the cross beam body is provided with one support portion, one support portion is connected with the liquid cooling plate, and the other support portion is provided with the cross beam lug away from the cross beam body.

[0022] In some possible embodiments, the intermediate cross beam further comprises a cross beam reinforcing rib, two ends of the cross beam reinforcing rib correspondingly connected with the two support portions, and one side wall of the cross beam reinforcing rib is connected with the cross beam body.

[0023] In some possible embodiments, the cross beam reinforcing rib comprises a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, the first reinforcing ribs have a vertical extension direction with respect to the extension direction of the cross beam body, the first reinforcing ribs are arranged side by side between the two support portions to divide the side wall of the cross beam body into a plurality of reinforcing intervals, each reinforcing interval is provided with one second reinforcing rib, two ends of the second reinforcing rib correspondingly extend to two diagonal opposite positions of the reinforcing interval, and the inclination directions of adjacent second reinforcing ribs are opposite.

[0024] In some possible embodiments, the cross beam body is provided with a relief gap away from the liquid cooling plate, the relief gap is arranged at least at the middle and two ends of the cross beam body, and the shape of the support portion away from the liquid cooling plate is adapted to the shape of the cross beam body.

[0025] In some possible embodiments, the support portion away from the liquid cooling plate is provided with a first sealing groove, a second sealing groove and a bolt hole, each side of the extension direction of the support portion is provided with the first sealing groove, each side of the bolt hole is provided with the second sealing groove, two ends of the second sealing groove correspondingly communicate with the first sealing grooves, the first sealing groove and the second sealing groove are used for mounting a sealing strip, and the bolt hole is used for connecting with a cover plate of a battery pack.

[0026] In the second aspect, the embodiments of the present application provide a battery pack, comprising a battery pack body and the tray according to any one of the first aspect.

[0027] Thirdly, embodiments of this application provide an electrical device, including a device body and a battery pack as described in the second aspect above, wherein the battery pack is fixed to the device body.

[0028] In the tray, battery pack, and electrical equipment provided in this application embodiment, the tray includes a tray body and lifting lug modules. First side beams are provided on opposite sides of the tray body. Multiple lifting lug modules are integrally formed on the first side beams, and the multiple lifting lug modules are arranged at intervals along the extension direction of the first side beams. The two first side beams have a symmetrical structure, while the lifting lug modules have the same structure. When performing integral forming processing, the development cost of the mold can be effectively reduced, thereby reducing the production cost of the tray. At the same time, the integral forming of the lifting lug modules and the first side beams can also effectively reduce the overall processing difficulty of the tray, thereby reducing the production cost of the tray in mass production from multiple aspects. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 This is a schematic diagram of the overall structure of the tray provided in an embodiment of this application;

[0031] Figure 2 A perspective view of the first side beam in the tray provided in an embodiment of this application;

[0032] Figure 3 for Figure 2 An enlarged schematic diagram of the structure within circle A;

[0033] Figure 4 A bottom view of the first side beam in the tray provided in an embodiment of this application;

[0034] Figure 5 for Figure 4 An enlarged schematic diagram of the structure within circle B in the diagram;

[0035] Figure 6 A front view of the first side beam in the tray provided in an embodiment of this application;

[0036] Figure 7 for Figure 6 An enlarged schematic diagram of the structure within circle C;

[0037] Figure 8 for Figure 1 A structural diagram of the tray from another perspective;

[0038] Figure 9 for Figure 8 A cross-sectional view of AA in the diagram;

[0039] Figure 10 is an enlarged schematic view of the structure within circle D in Figure 9 is an enlarged schematic view of the structure within circle D in

[0040] Figure 11 is a schematic view of the structure of the middle cross beam in the tray provided by the embodiment of the present application;

[0041] Figure 12 is a sectional view of B-B in Figure 11

[0042] Figure 13 is a top view of the middle cross beam in the tray provided by the embodiment of the present application;

[0043] Figure 14 is an enlarged schematic view of the structure within circle E in Figure 13

[0044] Reference signs:

[0045] 100 - first side beam; 110 - side beam body; 111 - second mounting hole; 1112 - boss; 120 - first connecting piece; 121 - avoiding slot; 130 - second connecting piece; 131 - first mounting hole; 132 - side beam sealing slot; 140 - third connecting piece; 141 - weight-reducing slot;

[0046] 200 - lifting lug module; 210 - connecting part; 211 - inclined surface; 220 - lifting lug part; 221 - lifting lug sleeve; 222 - lifting lug reinforcing rib; 223 - connecting hole;

[0047] 300 - second side beam;

[0048] 400 - middle cross beam; 410 - cross beam body; 411 - avoiding notch; 420 - support part; 430 - cross beam lifting lug; 440 - cross beam reinforcing rib; 441 - first reinforcing rib; 442 - second reinforcing rib; 450 - bolt hole; 461 - first sealing slot; 462 - second sealing slot;

[0049] 500 - liquid cooling plate.

[0050] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] ​​The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals designate identical or similar elements in the several figures. The implementations described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0052] The power battery pack is one of the core components commonly used in electric vehicles, hybrid vehicles and other electric devices. It is mainly composed of battery modules, a management system (BMS), a cooling system, a tray and a cover plate, etc.

[0053] At present, the tray of the power battery pack is mostly made by splicing extruded profiles, stamped parts, etc. The tray has many components and the welding process is complex, making it difficult to control product quality. When mass production is carried out, the cost is also relatively high.

[0054] At the same time, in order to ensure the strength of the tray, many additional reinforcing beams and reinforcing plates are generally added by welding or riveting, which leads to redundant design of the tray, resulting in poor lightweight effect of the tray.

[0055] In order to avoid the above problems, the embodiments of the present application provide a tray, a battery pack and an electric device. The first side beam and the lifting lug module of the tray are integrally formed, and the two first side beams are symmetrical, and the lifting lug modules are the same. During production, multiple molds for the lifting lug modules can be made, then spliced, and integrally die-cast, which can not only save multiple complex processes such as welding and riveting, improve the convenience of tray processing, but also effectively reduce the development cost of the mold, thereby reducing the processing cost of the tray from the mold and the assembly of the tray itself. At the same time, the embodiments of the present application directly integrally form the first side beam and the lifting lug module, which not only has obvious cost advantage in mass production, but also has high product consistency, which helps to control product quality. In addition, the embodiments of the present application are also specially designed on the force transmission path, which realizes the lightweight design of the tray while ensuring the mechanical properties of the tray.

[0056] It can be understood that the tray and the battery pack provided by the embodiments of the present application can not only be applied to electric vehicles and hybrid vehicles, but also can be applied to other devices that need to use battery packs, and the embodiments of the present application do not limit them.

[0057] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes can not be described again in some examples. The embodiments of the present application will be described below with reference to the drawings.

[0058] In some embodiments, as shown in Figure 1 The tray includes a tray body, and opposite sides of the tray body are each provided with a first side beam 100, which is connected with other structures on the tray body to form a containing portion for containing the battery module.

[0059] For example, as shown in Figure 1 The tray body further includes two second side beams 300 and a liquid cooling plate 500. The two second side beams 300 are arranged at two ends of the first side beams 100, and one end of each second side beam 300 is connected with an end of one first side beam 100, and the other end is connected with an end of the other first side beam 100. Meanwhile, the bottom of each of the first side beams 100 and the second side beams 300 is connected with the upper surface of the liquid cooling plate 500, so that the liquid cooling plate 500, the first side beams 100 and the second side beams 300 form a containing portion for containing the battery module. Meanwhile, the tray is also used for connecting a cover plate to seal the containing portion and protect the battery module inside.

[0060] It can be understood that the above is only an example of the structure of the tray body, and the tray body can also have other structures as long as it can cooperate with the first side beams 100 to form a containing portion, which is not limited in the present embodiment.

[0061] In some embodiments, each of the two first side beams 100 is integrally formed with a plurality of lug modules 200 on one side thereof away from the other first side beam 100, and the plurality of lug modules 200 are arranged at intervals along the extension direction of the first side beam 100. The lug modules 200 are used for connecting with the electric equipment, such as a vehicle frame.

[0062] For the commonly used tray, the distance between the adjacent lug modules 200 can be designed to be 100-500 mm. Of course, it can be understood that the distance between the adjacent lug modules 200 can also be different from the above value, and can be adjusted according to the installation of the tray and the electric equipment, which is not limited in the present embodiment.

[0063] Of course, the number of the lug modules 200 can also be adjusted according to the actual situation, and the number can be two, three or more, which is not limited in the present embodiment.

[0064] The first side beam 100 and the lug module 200 can be produced by die casting, which is a metal forming process that uses high pressure to inject molten metal into a mold cavity, and the desired part is obtained after demolding after cooling.

[0065] Specifically, when producing the first side beam 100 and the lug module 200, the number and position of the lug module 200 can be determined according to the design requirements of the current tray, and then the number and position of the mold corresponding to the lug module 200 are adjusted accordingly, so that the mold corresponding to the lug module 200 is spliced with the mold of the first side beam 100 at the appropriate position, and then integrally die casting, that is, when adjusting the design of the tray, only the number and position of the mold corresponding to the lug module 200 need to be changed, and the mold of the lug module 200 does not need to be redesigned, which can greatly reduce the development cost of the mold, and at the same time, the consistency of the structural strength of the first side beam 100 at different positions can be improved, and the overall performance of the tray can be improved.

[0066] It can be understood that the first side beam 100, the second side beam 300, and the liquid cooling plate 500 can be integrally die cast, or the first side beam 100, the second side beam 300, and the liquid cooling plate 500 can be separately die cast and then connected by welding, and when connected by welding, the bottom of the first side beam 100 and the second side beam 300 can be connected to the liquid cooling plate 500 by friction stir welding to improve the connection strength. The friction stir welding uses a rotating tool to generate friction heat between the welding materials, which makes the materials locally plasticized and forms a weld under pressure, and has good connection strength and sealing performance.

[0067] At the same time, the first side beam 100, the second side beam 300, and the liquid cooling plate 500 can be made of aluminum alloy, such as AlSi10MnMg, to reduce the weight of the tray while meeting the strength requirements of the tray. Of course, the tray can also be made of other materials that meet the use requirements, and the present embodiment is only illustrative and not limiting.

[0068] In addition, the first side beam 100 and the lug module 200 are integrally formed, which can save multiple complex processes such as welding and riveting, improve the convenience of tray processing, and thus reduce the processing cost of the tray from the aspects of mold development and tray assembly, which has great advantages in mass production of trays.

[0069] In some embodiments, as shown in Figure 2 and Figure 3 The lug module 200 includes a lug portion 220 and at least one connecting portion 210 disposed on the lug portion 220, and the lug portion 220 and the connecting portion 210 are connected to the first side beam 100.

[0070] The lug portion 220 is used to connect with the electrical equipment, and is at least partially connected with the first edge beam 100, and the connecting portion 210 can increase the connection area of the lug module 200 and the first edge beam 100, so that the connection strength of the lug module 200 and the first edge beam 100 is improved by the connecting portion 210.

[0071] In some embodiments, as shown in Figure 3 , Figure 4 and Figure 5 , the lug portion 220 includes a lug sleeve 221 and at least two lug reinforcing ribs 222, the lug sleeve 221 and the lug reinforcing ribs 222 are both connected with the first edge beam 100, the lug sleeve 221 is provided with a connecting hole 223 for inserting a bolt, so that the lug sleeve 221 can be installed on the electrical equipment by the bolt, and the lug reinforcing ribs 222 are also used to connect the lug sleeve 221 and the connecting portion 210, that is, the connecting portion 210 is not directly connected with the lug sleeve 221, but is connected through the lug reinforcing ribs 222.

[0072] Among them, the lug sleeve 221, the lug reinforcing ribs 222 and the connecting portion 210 are all connected with the first edge beam 100, and the lug reinforcing ribs 222 also connect the lug sleeve 221 and the connecting portion 210, so that the load received by the lug sleeve 221 can be dispersed and transmitted to the first edge beam 100 from multiple positions.

[0073] Further, the connecting portion 210 is a first connecting plate, and two connecting portions 210 are provided and are arranged on both sides of the lug portion 220.

[0074] Specifically, as shown in Figure 3 , the two first connecting plates are arranged on both sides of the lug portion 220, and at least one side wall of the first connecting plate is connected with the first edge beam 100, and at least one side wall of the lug reinforcing rib 222 is connected with the first edge beam 100, and among the other two opposite side walls, one is connected with the lug sleeve 221, and the other is connected with the first connecting piece 120, so as to assist in force transmission.

[0075] It can be understood that the lug reinforcing rib 222 can be provided as two or more, as long as it can effectively transmit the load and improve the strength of the lug module 200.

[0076] Exemplarily, the lug reinforcing rib 222 can be provided as four, and the four lug reinforcing ribs 222 are uniformly arranged outside the lug sleeve 221, and two lug reinforcing ribs 222 correspond to one first connecting plate, so as to be connected and reinforced by the lug reinforcing rib 222.

[0077] In some embodiments, as shown in Figure 6 and Figure 7As shown, in order to facilitate the connection of the lifting lug module 200 and the first side beam 100, the first side beam 100 comprises a side beam body 110 and a first connecting piece 120 arranged on the side beam body 110, the extending direction of the first connecting piece 120 is the same as that of the side beam body 110, and the first connecting piece 120 is provided with a plurality of through holes, each of which is in communication with a connecting hole 223 and faces each other to allow the bolt to pass through.

[0078] Among them, the lug sleeve 221 and the top of the connecting part 210 are connected with the first connecting piece 120, and one side wall of the connecting part 210 is also connected with the side beam body 110, so that the connecting part 210 and the lug sleeve 221 can be used as the main force transmission path from the mounting point to other parts in the Z-direction vibration process, thereby improving the Z-direction modal frequency of the battery pack.

[0079] In some embodiments, please refer to Figure 7 As shown, the side beam body 110 is provided with a second connecting piece 130 and at least one third connecting piece 140, the extending direction of the second connecting piece 130 is the same as that of the side beam body 110, and the third connecting piece 140 is connected with the second connecting piece 130 and the first connecting piece 120 respectively.

[0080] In the design, the first connecting piece and the second connecting piece 130 can be parallel to each other, and both are connected with the side beam body 110 away from the accommodating part side, the lug sleeve 221, the connecting part 210 and the lug reinforcing rib 222 are connected with the bottom of the first connecting piece 120, and the third connecting piece 140 is located between the first connecting piece 120 and the second connecting piece 130, the top of which is connected with the second connecting piece 130, and the bottom is connected with the first connecting piece 120, which uses the third connecting piece 140 as a force transmission path in the Z-direction vibration process to assist in improving the Z-direction modal frequency of the battery pack.

[0081] Further, the third connecting piece 140 is arranged one by one with the lug part 220, that is, the third connecting piece 140 is located above the lug part 220, and its projection on the first connecting piece 120 at least partially coincides with the projection of the lug module 200 on the first connecting piece 120, the third connecting piece 140 comprises two first rib plates arranged oppositely, one end of the third connecting piece 140 is connected with the first connecting piece 120, the other end is connected with the second connecting piece 130, and the side wall facing the side beam body 110 is connected with the side beam body 110, so as to further improve the Z-direction modal frequency of the battery pack.

[0082] It can be understood that the first connecting piece 120 and the second connecting piece 130 can be of any shape, as long as they extend along the extending direction of the first side beam 100 and can be effectively connected with the above-mentioned components, which are not limited in this embodiment.

[0083] In order to further realize the lightweight of the tray, the first connecting piece 120 is a second rib plate, the edge beam body 110 is a first main rib plate, the second connecting piece 130 is a third rib plate, the second rib plate and the third rib plate are parallel to each other, and the second rib plate and the third rib plate are perpendicular to the first main rib plate.

[0084] In addition to helping to improve the Z-direction modal frequency of the battery pack, the presence of the first connecting piece 120 and the second connecting piece 130 can also improve the bending stiffness of the side of the tray, so that the battery pack has stronger anti-extrusion ability on the side, and the internal battery cells are better protected in the side column collision and other working conditions.

[0085] In addition, the thickness of the first connecting piece 120, the second connecting piece 130, the third connecting piece 140, the connecting part 210, and the lug reinforcing rib 222 can also be set to 1.5-4mm, and when using aluminum alloy integrated die casting, the thickness of each part in this range can meet most of the use requirements. Although a thicker part can further improve the strength, it will also increase the weight.

[0086] Further, please refer to Figure 5 In addition, a plurality of avoidance grooves 121 can be provided on the first connecting piece 120, the avoidance grooves 121 are located on the side of the first connecting piece 120 away from the edge beam body 110, the height of the avoidance grooves 121 in the Z direction is the same as the height of the first connecting piece 120 in the Z direction, the avoidance grooves 121 are arranged in intervals along the extension direction of the first connecting piece 120, and the lug module 200 and the third connecting piece 140 are connected with the mounting part.

[0087] In addition, the projection of the second connecting piece 130 in the Z direction is located in the mounting part, that is, the width of the second connecting piece 130 in the X direction is less than the width of the position of the first connecting piece 120 provided with the mounting part in the X direction, and the minimum width of the first connecting piece 120 provided with the avoidance grooves 121 in the X direction is close to the width of the second connecting piece 130 in the X direction. Such a setting mode keeps the stiffness of the upper and lower parts of the first edge beam 100 consistent, and in the side column collision working condition, the extrusion force is uniformly transmitted to the upper and lower directions of the tray, so that the single-sided extrusion and overturning extrusion into the battery cell due to the protrusion of one side are avoided, and the presence of the avoidance grooves 121 also helps to realize the lightweight goal of the tray.

[0088] It can be understood that the avoidance grooves 121 can be provided with a structure similar to an isosceles trapezoid, or can be provided with an arc shape or other structures, which are not limited in the present embodiment.

[0089] In some embodiments, in order to realize the lightweight goal, please refer to Figure 8 , Figure 9and Figure 10 As shown, the third connecting piece 140 is provided with at least one lightening groove 141 on the side away from the side beam body 110, which has little effect on the structural strength and can effectively reduce the weight of the first side beam 100.

[0090] Exemplarily, the lightening groove 141 is provided with a structure similar to an isosceles trapezoid, the shorter base thereof serving as the bottom of the lightening groove 141, and the two waists thereof having an included angle of 30°-60° with the horizontal plane.

[0091] Exemplarily, the lightening groove 141 is one concave arc or is formed by splicing a plurality of concave arcs, and the adjacent arcs are smoothly connected.

[0092] It can be understood that the structure of the lightening groove 141 is only illustrative and not limited thereto, and other applicable shapes can also be applied herein.

[0093] In some embodiments, referring to Figure 10 As shown, the connecting portion 210 is provided with an inclined surface 211 on the side away from the first connecting piece 120, which is located at the end of the connecting portion 210 away from the side beam body 110 and is inclined from the bottom of the connecting portion 210 toward the first connecting piece 120, which not only facilitates demolding but also helps reduce the weight of the lug module 200.

[0094] In some embodiments, referring to Figure 5 and Figure 10 As shown, the second connecting piece 130 can be located on the top of the side beam body 110, and the first connecting piece 120 can be located at any position of the side wall of the side beam body 110, as long as the bottom of the connecting portion 210 is on the same plane as the bottom of the side beam body 110.

[0095] The first connecting piece 130 is provided with a first mounting hole 131 for mounting a cover plate of a battery pack and a side beam sealing groove 132, the extension direction of the side beam sealing groove 132 being the same as that of the second connecting piece 130, and the side beam sealing groove 132 can be provided with a sealing strip when the cover plate is mounted, so as to seal and connect the cover plate and the first side beam 100. The second mounting hole 111 is provided on the bottom of the side beam body 110 and is used for mounting a bottom guard plate of the battery pack. Such a mounting mode does not need to separately drill holes and open the side beam sealing groove 132, but directly designs the mold to be integrally formed, thereby reducing the process and the loss caused by the error in the machining process, effectively reducing the processing cost of the tray in mass production and improving the consistency of the first side beam 100.

[0096] In addition, the first side beam 100 is processed by combining multiple molds, and when the first side beam 100 is processed, it can be demolded from three directions. The lug sleeve 221, the lug reinforcing rib 222 and the second mounting hole 111 can be demolded by moving the corresponding mold downward (negative direction of the Z axis), the first connecting piece 120, the second connecting piece 130, the third connecting piece 140 and the connecting part 210 can be demolded by moving the mold in the Y direction, and the first mounting hole 131 and the side beam sealing groove 132 can be demolded by moving the mold upward (positive direction of the Z axis). In order to facilitate demolding, the first connecting piece 120, the second connecting piece 130, the third connecting piece 140 and the connecting part 210 can be provided with corresponding draft angles.

[0097] In some embodiments, referring to Figure 7 As shown, the included angle between the first rib plate and the first connecting piece 120 is 30°-90°, and the two first rib plates are symmetrically arranged on both sides of the central axis of the lug sleeve 221, so that the included angle between the first connecting plate and the first connecting piece 120 is 45°-90°, and the two first connecting plates are also symmetrically arranged on both sides of the central axis of the lug sleeve 221. Such arrangement can effectively improve the Z modal frequency of the battery pack, so that the battery pack can avoid the influence of the low frequency region, reduce the risk of fatigue damage, and improve the service life of the battery pack.

[0098] In some embodiments, referring to Figure 10 As shown, the first side beam 100 is provided with a boss 1112 on the side facing the accommodating part for connecting with the liquid cooling plate 500. The boss 1112 protrudes outward from the side beam body 110 and extends into the accommodating part. Of course, the boss 1112 is located at the lower part of the side beam body 110, and the bottom thereof can be in the same horizontal plane as the bottom of the side beam body 110. The length of the boss 1112 in the Y direction is basically the same as the length of the side beam body 110 in the Y direction. When the first side beam 100 is connected with the liquid cooling plate 500 by welding, the boss 1112 can be continuously friction stir welded with the upper surface of the liquid cooling plate 500, so that the connection has good sealing performance.

[0099] In some embodiments, referring to Figure 11 As shown, the tray body further comprises at least one intermediate cross beam 400, and the two ends of the intermediate cross beam 400 correspond to the two first side beams 100. The top of the intermediate cross beam 400 is integrally formed with at least one cross beam lug 430.

[0100] The intermediate cross beam 400 and the cross beam lug 430 are integrally pressure cast, so that the intermediate cross beam 400 does not need to be additionally welded with a lug structure, simplifying the processing process, and making the strength near the cross beam lug 430 higher and the strength consistency of the intermediate cross beam 400 higher.

[0101] In some embodiments, referring to Figs. 4 and 5, the intermediate cross beam 400 comprises a cross beam body 410 and a support portion 420, the extension directions of the cross beam body 410 and the support portion 420 are the same, and one support portion 420 is arranged on each side of the extension direction of the cross beam body 410, i.e., the support portions 420 are separately arranged at the top and bottom of the cross beam body 410. The support portion 420 at the bottom is connected with the liquid cooling plate 500, and the support portion 420 at the top is provided with a cross beam lug 430 away from one side of the cross beam body 410. Figure 11 and Figure 12 As shown in Figs. 4 and 5, the intermediate cross beam 400 comprises a cross beam body 410 and a support portion 420, the extension directions of the cross beam body 410 and the support portion 420 are the same, and one support portion 420 is arranged on each side of the extension direction of the cross beam body 410, i.e., the support portions 420 are separately arranged at the top and bottom of the cross beam body 410. The support portion 420 at the bottom is connected with the liquid cooling plate 500, and the support portion 420 at the top is provided with a cross beam lug 430 away from one side of the cross beam body 410.

[0102] By cooperation of the support portion 420 and the cross beam body 410, lightweight is facilitated. Specifically, the cross beam body 410 can be provided as a second main rib plate, and the support portion 420 is provided as a secondary rib plate. The second main rib plate is perpendicular to the secondary rib plate. The secondary rib plate can provide a suitable width for installation of the cross beam lug 430 and connection with the liquid cooling plate 500, and the second main rib plate does not become too thick while connecting the two secondary rib plates.

[0103] In some embodiments, referring to Figs. 4 and 5, the intermediate cross beam 400 comprises a cross beam body 410 and a support portion 420, the extension directions of the cross beam body 410 and the support portion 420 are the same, and one support portion 420 is arranged on each side of the extension direction of the cross beam body 410, i.e., the support portions 420 are separately arranged at the top and bottom of the cross beam body 410. The support portion 420 at the bottom is connected with the liquid cooling plate 500, and the support portion 420 at the top is provided with a cross beam lug 430 away from one side of the cross beam body 410. Figure 11 As shown in Figs. 4 and 5, the intermediate cross beam 400 further comprises a cross beam reinforcing rib 440, the two ends of the cross beam reinforcing rib 440 are connected with the two support portions 420, and one side wall of the cross beam reinforcing rib 440 is connected with the cross beam body 410, so that the cross beam reinforcing rib 440 is reinforced to improve the overall rigidity of the intermediate cross beam 400.

[0104] Specifically, the cross beam reinforcing rib 440 comprises a plurality of first reinforcing ribs 441 and a plurality of second reinforcing ribs 442. The extension direction of the first reinforcing rib 441 is perpendicular to the extension direction of the cross beam body 410. The plurality of first reinforcing ribs 441 are arranged side by side between the two support portions 420 to divide the side wall of the cross beam body 410 into a plurality of reinforcing intervals. Each reinforcing interval is provided with a second reinforcing rib 442, and the two ends of the second reinforcing rib 442 extend to the two diagonal corners of the reinforcing interval. The inclination directions of adjacent second reinforcing ribs 442 are opposite. By the structure of the truss, the overall rigidity of the intermediate cross beam 400 is further improved, and the structure is simple, and the lightweight effect is also relatively obvious.

[0105] It can be understood that the arrangement position of the first reinforcing rib 441 can be arranged according to the stress point of the intermediate cross beam 400. For example, the stress point is mainly at the position of the cross beam lug 430, so the first reinforcing rib 441 can be arranged directly below the cross beam lug 430. The connection position of the support portion 420 at the top of the cross beam body 410 with the first reinforcing rib 441 and the second reinforcing rib 442 is extremely close, so that the first reinforcing rib 441 and the second reinforcing rib 442 support this position to improve the overall rigidity of the intermediate cross beam 400.

[0106] In addition, the cross beam reinforcing rib 440 can be arranged on one side of the cross beam body 410, or can be symmetrically arranged on both sides of the cross beam body 410. If the cross beam reinforcing rib 440 is arranged on both sides of the cross beam body 410, the middle part of the support part 420 can be connected to both ends of the cross beam body 410.

[0107] In some embodiments, referring to Figure 11 As shown, the cross beam body 410 is provided with a relief gap 411 on the side away from the liquid cooling plate 500. The relief gap 411 is arranged at least on the middle part and both ends of the cross beam body 410. The shape of the support part 420 located on the side of the cross beam body 410 away from the liquid cooling plate 500 is adapted to the shape of the cross beam body 410.

[0108] The relief gap 411 can be used to provide space for electrical lines in the battery pack, facilitating wiring inside the battery pack. At the same time, the positions of the relief gaps 411 correspond to the positions of the support parts 420 and the cross beam reinforcing ribs 440 for reinforcement, and will not affect the strength of the intermediate cross beam 400.

[0109] In addition, for the intermediate cross beam 400, it is found through multiple production experiments that the thicknesses of the cross beam body 410, the support part 420 and the cross beam reinforcing rib 440 can be set to 2-4 mm to meet the use requirements in most cases.

[0110] In some embodiments, referring to Figure 13 and Figure 14 As shown, the support part 420 located on the side of the cross beam body 410 away from the liquid cooling plate 500, i.e., the support part 420 located on the top of the cross beam body 410, is provided with a first sealing groove 461, a second sealing groove 462 and a bolt hole 450. The first sealing groove 461 is arranged on both sides of the extension direction of the support part 420. The second sealing groove 462 is arranged on both sides of the bolt hole 450. The two ends of the second sealing groove 462 correspond to the first sealing groove 461. The first sealing groove 461 and the second sealing groove 462 are used to install a sealing strip. The bolt hole 450 is used to connect with the cover plate of the battery pack.

[0111] After the bolt hole 450 is connected with the battery pack, the sealing strip can seal the gap between the cover plate and the support part 420, so that the intermediate cross beam 400 and the cover plate can be sealingly connected, so that the containing part becomes a sealed cavity, effectively protecting the battery module.

[0112] The first sealing groove 461, the second sealing groove 462 and the bolt hole 450 can be directly formed when the intermediate cross beam 400 is pressure cast, without the need for additional processing, thereby simplifying the production process of the intermediate cross beam 400 and reducing the cost of mass production of the intermediate cross beam 400.

[0113] It can be understood that the intermediate cross beam 400 and the liquid cooling plate 500 can be connected in a bonding or welding manner. When connected by welding, the middle region of the support part 420 located at the bottom of the cross beam body 410 can be thickened. The middle region is the connection part 210 of the support part 420 and the cross beam body 410. For example, the thickness of this region in the Z direction is set to 4-6 mm, so as to avoid the case that welding penetration occurs when this position is used as a welding platform.

[0114] The structure of the tray in the embodiment of the application is verified by a calculation method of topological optimization, and it is found that the tray can meet the use requirements of the tray under various working conditions. In the optimization process, the main method is to control the addition and deletion of units by changing the material density of each unit, and gradually realize the best distribution of materials in space. The simulation can be performed according to the following steps:

[0115] 1. Establish a simulation model: first, divide the battery pack model into grids, establish a connection relationship, define material parameters, etc., and then envelope structures such as the lug sleeve of the tray side beam, the second connecting piece, and the side beam body are defined as non-design domains, and the remaining other regions within the outer envelope of the side beam are defined as design domains.

[0116] 2. Define design variables: define design variables based on the design domain of the side beam, set the ejection direction to the direction of the two sides of the side beam in the horizontal plane; and define the minimum, maximum thickness size, minimum interval, etc. of the design variable to control the generation effect of the rib plate; and the design domains of the left and right side beams are symmetrically constrained.

[0117] 3. Define load steps: respectively establish load analysis steps for calculating the modal, extrusion, and torsion of the battery pack.

[0118] 4. Define response: establish the response parameters of the modal frequency of the first-order main vibration mode of the battery pack, the deformation amount of the extrusion condition, the deformation amount of the torsion condition, and the volume fraction (or mass) of the tray design domain; and according to the response parameters and importance of a single working condition, define the weighting coefficients, and establish the weighted response parameters of these working conditions.

[0119] 5. Define constraints: the volume fraction (or mass) response of the tray design domain is defined as the constraint condition in the optimization process, and the upper limit value of the remaining volume fraction (or mass) after optimization of the design domain is defined.

[0120] 6. Define optimization target: the weighted response parameters of multiple working conditions are used as the optimization target, so that the modal frequency, extrusion deformation, and torsion stiffness meet the preset conditions.

[0121] 7. Submit calculation, and output the topological optimization result after the optimization target reaches the convergence condition.

[0122] In general, the tray provided by the embodiments of the present application is designed in combination with the topology optimization result, and the mechanical performance under multiple working conditions such as vibration and pressurization is considered, so that the tray has a reasonable force transmission path under different working conditions, the battery pack has a high modal frequency and a small extrusion deformation, and the safety of the battery pack is improved.

[0123] The embodiments of the present application also provide a battery pack, which includes a battery pack body and the tray in the above embodiments, and the battery pack body can include a cover plate, a battery module, a cooling system and corresponding components, wherein the tray can be connected with the cover plate of the battery pack to seal the accommodation part, and the battery module is located in the accommodation part and is protected by the cover plate and the tray.

[0124] It can be understood that the structure of each component in the battery pack, the working principle of the battery pack, and the connection mode of each component are well known to those skilled in the art, and the embodiments will not be described here.

[0125] The embodiments of the present application also provide a power consumption device, which includes a device body and a battery pack, and the battery pack is connected with the device body through the lug module 200 and the cross beam lug 430 and the like.

[0126] It can be understood that the power consumption device in the embodiments includes but is not limited to electric vehicles, hybrid electric vehicles, energy storage systems, consumer electronics, medical devices, unmanned aerial vehicles, electric tools and the like which need to use the battery pack.

[0127] Finally, it should be noted that: other embodiments of the present application will be easily conceived by those skilled in the art after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present application, which follow the general principles of the present application and include common knowledge or conventional technical means in the technical field of the present application which are not disclosed in the present application, and are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A tray, characterized in that, The pallet includes a pallet body and a lifting lug module (200). The pallet body has a first side beam (100) on each of its opposite sides. Each of the two first side beams (100) is integrally formed with a plurality of lifting lug modules (200) on one side away from each other. The plurality of lifting lug modules (200) are arranged at intervals along the extension direction of the first side beam (100). The lug module (200) includes a lug portion (220) and at least one connecting portion (210) disposed on the lug portion (220), both the lug portion (220) and the connecting portion (210) being connected to the first side beam (100); The lifting lug (220) includes a lifting lug sleeve (221) and at least two lifting lug reinforcing ribs (222). The lifting lug sleeve (221) is connected to the first side beam (100). The lifting lug sleeve (221) is provided with a connecting hole (223) for bolt insertion. One end of the lifting lug reinforcing rib (222) is connected to the lifting lug sleeve (221), and the other end is connected to the connecting part (210). The connecting part (210) is a first connecting plate, and there are two connecting parts (210), which are respectively located on both sides of the lifting lug (220); The first side beam (100) includes a side beam body (110) and a first connector (120) disposed on the side beam body (110). The extension direction of the first connector (120) is the same as the extension direction of the side beam body (110). The first connector (120) is provided with a through hole that mates with the connecting hole (223). The lifting lug sleeve (221) and the connecting part (210) are both connected to the first connector (120). The connecting part (210) is also connected to the side beam body (110).

2. The pallet according to claim 1, characterized in that, The connecting part (210) has an inclined surface (231) on the side away from the first connecting member (120), and the inclined surface (231) is located at the end of the connecting part (210) away from the side beam body (110).

3. The tray according to claim 1, characterized in that, The included angle between the connecting part (210) and the first connecting member (120) is 45°-90°.

4. The tray according to claim 1, characterized in that, The side beam body (110) is provided with a second connector (130) and at least one third connector (140). The extension direction of the second connector (130) is the same as the extension direction of the side beam body (110). The third connector (140) is connected to the second connector (130) and the first connector (120) respectively. The lifting lug module (200) is located on the side of the first connector away from the second connector (130).

5. The tray according to claim 4, characterized in that, The third connector (140) is provided in a one-to-one correspondence with the lug (220). The third connector (140) includes two first ribs arranged opposite to each other. One end of the first rib is connected to the first connector (120), and the other end is connected to the second connector (130).

6. The pallet according to claim 5, characterized in that, The included angle between the first rib and the first connector (120) is 30°-90°.

7. The tray according to claim 5, characterized in that, The first rib is provided with at least one weight-reducing groove (141) on the side away from the main body of the side beam (110).

8. The tray according to claim 4, characterized in that, The first connector (120) has a plurality of clearance grooves (111) spaced apart on the side away from the side beam body (110), and an installation part (112) is formed between adjacent clearance grooves (111). The projection of the second connector (130) on the first connector (120) is located in the installation part (112). The lifting lug sleeve (221) and the connecting part (210) are both connected to the installation part (112).

9. The tray according to any one of claims 1-8, characterized in that, The tray body also includes a liquid cooling plate (500) and two second side beams (300). The two second side beams (300) are connected to the two ends of the first side beam (100). The first side beam (100) and the second side beams (300) are arranged around the periphery of the liquid cooling plate (500) to form a receiving portion on the liquid cooling plate (500).

10. The tray according to claim 9, characterized in that, The first side beam (100) is provided with a boss (132) for connecting with the liquid cooling plate (500) on the side facing the receiving part.

11. The tray according to claim 9, characterized in that, The pallet body also includes at least one intermediate crossbeam (400), the two ends of which are connected to the two first side beams (100), and the top of the intermediate crossbeam (400) is integrally formed with at least one crossbeam lug (430).

12. The pallet according to claim 11, characterized in that, The intermediate crossbeam (400) includes a crossbeam body (410) and a support part (420). The crossbeam body (410) and the support part (420) extend in the same direction. A support part (420) is provided on both sides of the extension direction of the crossbeam body (410). One support part (420) is connected to the liquid cooling plate (500), and the other support part (420) is provided with a crossbeam lug (430) on the side away from the crossbeam body (410).

13. The pallet according to claim 12, characterized in that, The intermediate crossbeam (400) also includes a crossbeam reinforcing rib (440), the two ends of which are connected to the two support parts (420), and one side wall of the crossbeam reinforcing rib (440) is connected to the crossbeam body (410).

14. The tray according to claim 13, characterized in that, The crossbeam reinforcing rib (440) includes a plurality of first reinforcing ribs (441) and a plurality of second reinforcing ribs (442). The extension direction of the first reinforcing ribs (441) is perpendicular to the extension direction of the crossbeam body (410). The plurality of first reinforcing ribs (441) are arranged side by side between the two support portions (420) to divide the side wall of the crossbeam body (410) into a plurality of reinforcing intervals. Each reinforcing interval is provided with a second reinforcing rib (442), and the two ends of the second reinforcing rib (442) extend to the two diagonal corners of the reinforcing interval. The inclination directions of adjacent second reinforcing ribs (442) are opposite.

15. The pallet according to claim 12, characterized in that, The crossbeam body (410) is provided with a clearance notch (411) on the side away from the liquid cooling plate (500). The clearance notch (411) is provided at least once in the middle and once at both ends of the crossbeam body (410). The shape of the support part (420) located on the side of the crossbeam body (410) away from the liquid cooling plate (500) is adapted to the shape of the crossbeam body (410).

16. The pallet according to claim 12, characterized in that, The support portion (420) located on the side of the main body (410) away from the liquid cooling plate (500) is provided with a first sealing groove (461), a second sealing groove (462) and a bolt hole (450). The first sealing groove (461) is provided on both sides of the extension direction of the support portion (420), and the second sealing groove (462) is provided on both sides of the bolt hole (450). The two ends of the second sealing groove (462) are connected to the first sealing groove (461). The first sealing groove (461) and the second sealing groove (462) are used to install sealing strips, and the bolt hole (450) is used to connect with the cover plate of the battery pack.

17. A battery pack, characterized in that, It includes a battery pack body and a tray as described in any one of claims 1-16, wherein the battery pack body and the tray are connected.

18. An electrical appliance, characterized in that, It includes a device body and a battery pack as described in claim 17, wherein the battery pack is fixed to the device body.

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