Tray, battery pack and electric equipment

Abstract

The embodiment of the invention provides a tray, a battery pack and electric equipment, and relates to the technical field of battery packs, the tray comprises a tray body and lifting lug modules, first edge beams are arranged on the two opposite sides of the tray body, and a plurality of lifting lug modules are integrally formed on the sides, away from each other, of the two first edge beams; the lifting lug modules are arranged in the extending direction of the first edge beam at intervals, the first edge beam and the same lifting lug modules are integrally formed, the development cost of a mold can be effectively reduced, meanwhile, the machining steps of the tray can be simplified, and therefore 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 packs, and in particular to a tray, a battery pack and an electrical device. Background Art

[0002] The power battery pack is a key component used to store and provide electrical energy in electric vehicles, hybrid vehicles, power tools and other electric devices. The power battery pack generally includes a battery module, a tray and a cover plate. The cover plate is sealed and connected to the tray to form a space for accommodating the battery module.

[0003] The connection between the tray and the equipment using the power battery pack is a relatively important component of the power battery pack. Specifically, the two side beams of the tray are connected to the ear beams by welding or riveting, and the ear beams are provided with multiple ears, which are connected to the equipment using the power battery pack through the ears.

[0004] In the above method, it is necessary to set a lifting lug beam and a lifting lug on the pallet, which makes the pallet processing process complicated and the production cost high. Summary of the invention

[0005] The embodiments of the present application provide a pallet, a battery pack, and an electrical device to simplify the pallet processing technology and reduce the production cost of the pallet.

[0006] In a first aspect, an embodiment of the present application provides a pallet, comprising a pallet body and a lifting ear module, wherein first side beams are provided on opposite sides of the pallet body, a plurality of the lifting ear modules are integrally formed on two sides of the first side beams facing away from each other, and the plurality of the lifting ear modules are arranged at intervals along the extension direction of the first side beams.

[0007] In some possible implementations, the lifting eye module includes a lifting eye portion and at least one connecting portion provided on the lifting eye portion, and both the lifting eye portion and the connecting portion are connected to the first side beam.

[0008] In some possible embodiments, the lifting ear portion includes a lifting ear sleeve and at least two lifting ear reinforcement ribs, the lifting ear sleeve is connected to the first side beam, the lifting ear sleeve is provided with a connecting hole for inserting a bolt, one end of the lifting ear reinforcement rib is connected to the lifting ear sleeve, and the other end is connected to the connecting portion.

[0009] In some possible implementations, the connecting portion is a first connecting plate, and two connecting portions are provided and are respectively arranged on both sides of the hanging ear portion.

[0010] In some possible embodiments, the first side beam includes a side beam main body and a first connecting member arranged on the side beam main body, the extension direction of the first connecting member is the same as the extension direction of the side beam main body, the first connecting member is provided with a through hole matching the connecting hole, the lifting ear sleeve, the lifting ear reinforcement rib and the connecting part are all connected to the first connecting member, and the connecting part is also connected to the side beam main body.

[0011] In some possible implementations, a slope is provided on a side of the connecting portion facing away from the first connecting member, and the slope is located at an end of the connecting portion facing away from the side beam body.

[0012] In some possible implementations, an angle between the connecting portion and the first connecting member is 45°-90°.

[0013] In some possible embodiments, a second connecting member and at least one third connecting member are provided on the side beam body, the extension direction of the second connecting member is the same as the extension direction of the side beam body, the third connecting member is respectively connected to the second connecting member and the first connecting member, and the ear module is located on the side of the first connecting member away from the second connecting member.

[0014] In some possible implementations, the third connecting member is disposed in one-to-one correspondence with the lifting ear portion, and the third connecting member includes two first ribs disposed opposite to each other, one end of the first rib is connected to the first connecting member, and the other end is connected to the second connecting member.

[0015] In some possible implementations, an angle between the first rib and the first connecting member is 30°-90°.

[0016] In some possible implementations, at least one weight-reducing groove is provided on a side of the first rib facing away from the side beam body.

[0017] In some possible embodiments, a plurality of avoidance grooves are arranged at intervals on the side of the first connecting member facing away from the side beam body, a mounting portion is formed between adjacent avoidance grooves, a projection of the second connecting member on the first connecting member is located within the mounting portion, and the ear sleeve and the connecting portion are both connected to the mounting portion.

[0018] In some possible embodiments, the tray body also includes a liquid cooling plate and two second side beams, the two second side beams are correspondingly connected to the two ends of the first side beam, and the first side beam and the second side beam are arranged around the periphery of the liquid cooling plate to enclose a receiving portion on the liquid cooling plate.

[0019] In some possible implementations, a boss for connecting to the liquid cooling plate is provided on a side of the first side beam facing the accommodating portion.

[0020] In some possible implementations, the pallet body further includes at least one middle cross beam, two ends of the middle cross beam are correspondingly connected to the two first side beams, and at least one cross beam ear is integrally formed on the top of the middle cross beam.

[0021] In some possible embodiments, the middle crossbeam includes a crossbeam body and a supporting portion, the crossbeam body and the supporting portion have the same extension direction, a supporting portion is provided on both sides of the extension direction of the crossbeam body, one supporting portion is connected to the liquid cooling plate, and the other supporting portion is provided with the crossbeam ear on the side away from the crossbeam body.

[0022] In some possible implementations, the middle cross beam further includes a cross beam reinforcement rib, two ends of the cross beam reinforcement rib are correspondingly connected to the two support portions, and a side wall of the cross beam reinforcement rib is connected to the cross beam body.

[0023] In some possible embodiments, the beam reinforcement ribs include a plurality of first reinforcement ribs and a plurality of second reinforcement ribs, the extension direction of the first reinforcement ribs is perpendicular to the extension direction of the beam body, the plurality of first reinforcement ribs are arranged side by side between the two support portions to divide the side wall of the beam body into a plurality of reinforcement intervals, each of the reinforcement intervals is provided with a second reinforcement rib, and the two ends of the second reinforcement ribs extend to two diagonal corners of the reinforcement interval respectively, and the inclination directions of adjacent second reinforcement ribs are opposite.

[0024] In some possible embodiments, an avoidance gap is provided on the side of the beam body facing away from the liquid cooling plate, and at least one avoidance gap is provided in the middle and at both ends of the beam body, and the shape of the support portion located on the side of the beam body facing away from the liquid cooling plate is adapted to the shape of the beam body.

[0025] In some possible embodiments, a first sealing groove, a second sealing groove and a bolt hole are provided on the support portion located on the side of the beam body away from the liquid cooling plate, the first sealing groove is provided on both sides of the extension direction of the support portion, the second sealing groove is provided on both sides of the bolt hole, both ends of the second sealing groove are correspondingly connected to the first sealing groove, the first sealing groove and the second sealing groove are used for installing sealing strips, and the bolt hole is used to connect with the cover plate of the battery pack.

[0026] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery pack body and a tray as described in any one of the first aspects above, wherein the battery pack body is connected to the tray.

[0027] In a third aspect, an embodiment of the present application provides an electrical device, comprising a device body and the battery pack described in the second aspect above, wherein the battery pack is fixed on the device body.

[0028] In the pallet, battery pack and electrical equipment provided in the embodiments of the present application, the pallet includes a pallet body and a lifting ear module, and first side beams are arranged on opposite sides of the pallet body. A plurality of lifting ear modules are integrally formed on the first side beam, and the plurality of lifting ear modules are arranged at intervals along the extension direction of the first side beam. The two first side beams are symmetrical structures, and the lifting ear modules are of the same structure. When performing the integral molding process, the development cost of the mold can be effectively reduced, thereby reducing the production cost of the pallet. At the same time, the integral molding of the lifting ear module and the first side beam can also effectively reduce the overall processing difficulty of the pallet, thereby reducing the production cost of the pallet during mass production from multiple aspects. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 A schematic diagram of the overall structure of a tray provided in an embodiment of the present application;

[0031] Figure 2 A three-dimensional diagram of a first side beam in a pallet provided in an embodiment of the present application;

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

[0033] Figure 4 A bottom view of a first side beam in a pallet provided in an embodiment of the present application;

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

[0035] Figure 6 A front view of a first side beam in a pallet provided in an embodiment of the present application;

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

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

[0038] Fig. 9 for Figure 8 The cross-sectional view of AA in ;

[0039] Fig.10 for Fig. 9 An enlarged schematic diagram of the structure within circle D in FIG.

[0040] Fig.11 A schematic diagram of the structure of the middle crossbeam in the pallet provided in an embodiment of the present application;

[0041] Fig.12 for Fig.11 The cross-section of BB in ;

[0042] Fig.13 A top view of a middle crossbeam in a pallet provided in an embodiment of the present application;

[0043] Fig.14 for Fig.13 An enlarged schematic diagram of the structure within circle E in FIG.

[0044] Reference numerals:

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

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

[0047] 300-second side beam;

[0048] 400-middle crossbeam; 410-crossbeam body; 411-avoidance gap; 420-supporting part; 430-crossbeam hanging ear; 440-crossbeam reinforcement rib; 441-first reinforcement rib; 442-second reinforcement rib; 450-bolt hole; 461-first sealing groove; 462-second sealing groove;

[0049] 500-Liquid Cooling Plate.

[0050] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0051] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices 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, management system (BMS, Battery Management System), cooling system, tray and cover.

[0053] At present, the pallets of power battery packs are mostly welded together from extruded profiles, stampings, etc. However, the pallets have many components and the welding process is complicated, making it difficult to control product quality. The cost is also high when mass production is carried out.

[0054] At the same time, in order to ensure the strength of the pallet, it is generally necessary to add many additional reinforcing beams and reinforcing plate structures by welding or riveting, which leads to redundant design of the pallet and poor lightweight effect of the pallet.

[0055] In order to avoid the above problems, the embodiments of the present application provide a pallet, a battery pack and an electrical device, wherein the first side beam and the ear module of the pallet are formed in one piece, and the two first side beams are symmetrical, and the ear modules are the same. During production, multiple identical molds for the ear modules can be made, and then spliced, and die-casting can be performed in one piece, which can not only save multiple complex processes such as welding and riveting, improve the convenience of pallet processing, but also effectively reduce the development cost of the mold, thereby jointly reducing the processing cost of the pallet from the aspects of the assembly of the mold and the pallet itself. At the same time, the embodiments of the present application directly form the first side beam and the ear module in one piece, which not only has obvious cost advantages in mass production, but also has high product consistency, which helps to control product quality. In addition, the embodiments of the present application also carry out special design on the force transmission path in a targeted manner, so as to achieve a lightweight design of the pallet while ensuring the mechanical properties of the pallet.

[0056] It can be understood that the tray and battery pack provided in the embodiments of the present application can be used not only in electric vehicles and hybrid vehicles, but also in other equipment that requires the use of battery packs, and the embodiments of the present application are not limited thereto.

[0057] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0058] In some embodiments, see Figure 1 As shown, the tray includes a tray body, and first side beams 100 are arranged on opposite sides of the tray body. The first side beams 100 are connected to other structures on the tray body to form a receiving portion for receiving the battery module.

[0059] For example, Figure 1 As shown, the tray body also includes a second side beam 300 and a liquid cooling plate 500. Two second side beams 300 are provided and are respectively arranged at the two ends of the first side beam 100. One end of the second side beam 300 is connected to the end of one first side beam 100, and the other end is connected to the end of another first side beam 100. At the same time, the bottom of the first side beam 100 and the second side beam 300 are also connected to the upper surface of the liquid cooling plate 500, so that a receiving portion is formed between the liquid cooling plate 500, the first side beam 100 and the second side beam 300, and the receiving portion is used to receive the battery module. At the same time, the tray is also used to connect the cover plate, and the receiving portion is sealed by the cover plate to protect the internal battery module.

[0060] It is understandable that the above is only an example of the structure of the pallet body, and the pallet body may also be other structures as long as it can cooperate with the first side beam 100 to form a receiving portion, and this embodiment does not limit it here.

[0061] In some embodiments, a plurality of lifting ear modules 200 are integrally formed on the sides of the two first side beams 100 facing away from each other, and the plurality of lifting ear modules 200 are arranged at intervals along the extension direction of the first side beams 100 . The lifting ear modules 200 are used to connect to electrical equipment, such as a vehicle frame.

[0062] Among them, for currently commonly used pallets, the spacing between adjacent ear modules 200 can be designed to be 100-500mm. Of course, it is understandable that the distance between adjacent ear modules 200 may not be the above value, but can be adaptively adjusted according to the installation conditions of the pallet and the electrical equipment, and this embodiment does not limit it here.

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

[0064] The first side beam 100 and the lifting ear module 200 can be produced by die casting. Die casting is a metal forming process, which uses high pressure to inject molten metal into a mold cavity, and then demolds it after cooling to obtain the required parts.

[0065] Specifically, when producing the first side beam 100 and the ear module 200, the number and position of the ear modules 200 can be determined according to the design requirements of the current pallet, and then the number and position of the molds corresponding to the ear modules 200 can be adjusted accordingly, so that they can be spliced ​​with the mold of the first side beam 100 at a suitable position and then die-cast as one piece. That is, when adjusting the design of the pallet, it is only necessary to change the number and position of the molds corresponding to the ear modules 200 without redesigning the mold of the ear module 200, which can greatly reduce the development cost of the mold and also improve the consistency of the structural strength of different positions of the first side beam 100, thereby improving the overall performance of the pallet.

[0066] It is understandable that the first side beam 100, the second side beam 300, and the liquid cooling plate 500 can be integrally die-casted, or they can be die-casted separately and then welded together. When welding together, the bottoms of the first side beam 100 and the second side beam 300 can be stir-friction welded to the liquid cooling plate 500 to improve the connection strength. Stir-friction welding uses a rotating tool to generate friction heat between the welding materials, partially plasticizes the materials, and forms a weld under pressure, which has good connection strength and sealing.

[0067] At the same time, the first side beam 100, the second side beam 300 and the liquid cooling plate 500 can be die-casted with aluminum alloy, such as AlSi10MnMg, so as to reduce the weight of the pallet while ensuring that the strength of the pallet meets the requirements. Of course, the pallet can also be made of other materials that meet the use requirements. This embodiment is only an example and not a limitation.

[0068] In addition, integrally forming the first side beam 100 and the lifting ear module 200 can save multiple complex processes such as welding and riveting, improve the convenience of pallet processing, and thus reduce the processing cost of the pallet from the aspects of mold development and pallet assembly itself, which has a great advantage in mass production of pallets.

[0069] In some embodiments, see Figure 2 and Figure 3 As shown, the eye module 200 includes an eye portion 220 and at least one connecting portion 210 disposed on the eye portion 220 , and both the eye portion 220 and the connecting portion 210 are connected to the first side beam 100 .

[0070] The lifting ear portion 220 is used to connect to the electrical equipment, and it is at least partially connected to the first side beam 100, and the connecting portion 210 can increase the connection area between the lifting ear module 200 and the first side beam 100, thereby reinforcing the connection strength between the lifting ear module 200 and the first side beam 100 through the connecting portion 210.

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

[0072] Among them, the lifting ear sleeve 221, the lifting ear reinforcement rib 222, and the connecting part 210 are all connected to the first side beam 100, and the lifting ear reinforcement rib 222 also connects the lifting ear sleeve 221 and the connecting part 210, so that the load on the lifting ear sleeve 221 can be dispersedly transmitted to the first side beam 100 from multiple positions.

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

[0074] Specifically, if Figure 3 As shown, two first connecting plates are arranged on both sides of the lifting ear portion 220, and at least one side wall of the first connecting plate is connected to the first side beam 100, and at least one side wall of the multiple lifting ear reinforcement ribs 222 is connected to the first side beam 100, and of the other two opposite side walls, one is connected to the lifting ear sleeve 221, and the other is connected to the first connecting member 120, thereby assisting in force transmission.

[0075] It is understandable that the number of the lifting eye reinforcement ribs 222 can be two or more, as long as the load can be effectively transferred and the strength of the lifting eye module 200 can be improved.

[0076] Exemplarily, four lifting ear reinforcement ribs 222 can be provided, and the four lifting ear reinforcement ribs 222 are evenly arranged on the outside of the lifting ear sleeve 221, and two lifting ear reinforcement ribs 222 are correspondingly connected to a first connecting plate, so that the connection and reinforcement are performed through the lifting ear reinforcement ribs 222.

[0077] In some embodiments, see Figure 6 and Figure 7As shown, in order to facilitate the connection between the ear module 200 and the first side beam 100, the first side beam 100 includes a side beam body 110 and a first connecting member 120 arranged on the side beam body 110, and the extension direction of the first connecting member 120 is the same as the extension direction of the side beam body 110. A plurality of through holes are arranged on the first connecting member 120, and each through hole is connected to a corresponding connecting hole 223, and the two are opposite to each other for bolts to pass through.

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

[0079] In some embodiments, see Figure 7 As shown, a second connecting member 130 and at least one third connecting member 140 are provided on the side beam body 110, the extension direction of the second connecting member 130 is the same as the extension direction of the side beam body 110, and the third connecting member 140 is connected to the second connecting member 130 and the first connecting member 120 respectively.

[0080] During design, the first connection and the second connection member 130 can be made parallel to each other, and both are connected to the side of the side beam body 110 away from the accommodating portion, the ear sleeve 221, the connecting portion 210, and the ear reinforcement rib 222 are all connected to the bottom of the first connection member 120, and the third connection member 140 is located between the first connection member 120 and the second connection member 130, with its top connected to the second connection member 130 and its bottom connected to the first connection member 120. The third connection member 140 is used as a force transmission path during Z-direction vibration to assist in improving the Z-direction modal frequency of the battery pack.

[0081] Furthermore, the third connecting member 140 is arranged in a one-to-one correspondence with the lifting ear portion 220, that is, the third connecting member 140 is located above the lifting ear portion 220, and its projection on the first connecting member 120 at least partially overlaps with the projection of the lifting ear module 200 on the first connecting member 120. The third connecting member 140 includes two first ribs arranged opposite to each other, one end of the third connecting member 140 is connected to the first connecting member 120, and the other end is connected to the second connecting member 130, and a side wall facing the side beam body 110 is connected to the side beam body 110, so as to further increase the Z-direction modal frequency of the battery pack.

[0082] It is understandable that the first connecting member 120 and the second connecting member 130 can be of any shape as long as they extend along the extension direction of the first side beam 100 and can be effectively connected to the above-mentioned components, and this embodiment does not limit them.

[0083] Among them, in order to further achieve the lightweight of the pallet, this embodiment makes the first connecting member 120 the second rib, the side beam body 110 the first main rib, the second connecting member 130 the third rib, the second rib and the third rib are parallel to each other, and the second rib and the third rib are perpendicular to the first main rib.

[0084] Among them, the existence of the first connecting member 120 and the second connecting member 130, in addition to helping to increase the Z-direction modal frequency of the battery pack, can also improve the bending stiffness of the side of the tray, making the side of the battery pack more resistant to extrusion. Under conditions such as side column collision, the first side beam 100 provides better protection for the internal battery cells.

[0085] In addition, the thickness of the first connecting member 120, the second connecting member 130, the third connecting member 140, the connecting portion 210, and the ear reinforcement rib 222 can all be set to 1.5-4 mm. When using aluminum alloy one-piece die-casting, the thickness of each component is within this range, which can meet most usage requirements. Although thicker thickness can further improve strength, it will also increase weight accordingly.

[0086] For further information, see Figure 5 As shown, a plurality of avoidance grooves 121 can also be provided on the first connecting member 120. The avoidance grooves 121 are located on the side of the first connecting member 120 away from the side beam body 110. The height of the avoidance grooves 121 in the Z direction is the same as the height of the first connecting member 120 in the Z direction. The avoidance grooves 121 are arranged at intervals along the extension direction of the first connecting member 120. A mounting portion is formed between adjacent avoidance grooves 121, and the ear module 200 and the third connecting member 140 are both connected to the mounting portion.

[0087] The projection of the second connector 130 in the Z direction is located in the mounting portion, that is, the width of the second connector 130 in the X direction is smaller than the width of the first connector 120 in the X direction where the mounting portion is provided, and the minimum width of the position where the avoidance groove 121 is provided in the first connector 120 in the X direction is close to the width of the second connector 130 in the X direction. This arrangement keeps the stiffness of the upper and lower parts of the first side beam 100 consistent, and in the side column collision condition, the extrusion force is evenly transmitted to the upper and lower directions of the tray, respectively, to avoid overturning and extrusion of one side due to the protrusion of one side, and to intrude into the battery cell. At the same time, the existence of the avoidance groove 121 also helps to achieve the goal of lightweighting the tray.

[0088] It is understandable that the avoidance groove 121 can be configured as a structure similar to an isosceles trapezoid, or can be configured as an arc or other structures, which is not limited in this embodiment.

[0089] In some embodiments, to achieve lightweight goals, see Figure 8 , Fig. 9and Fig.10 As shown, at least one weight-reducing groove 141 is provided on the side of the third connecting member 140 away from the side beam body 110 . The weight-reducing groove 141 has little effect on the structural strength and can effectively reduce the weight of the first side beam 100 .

[0090] Exemplarily, the weight-reducing groove 141 is configured as a structure similar to an isosceles trapezoid, wherein the shorter bottom side serves as the bottom of the weight-reducing groove 141 , and the angles between the two sides and the horizontal plane are 30°-60°.

[0091] Exemplarily, the weight-reducing groove 141 is an inwardly concave arc, or is formed by splicing a plurality of inwardly concave arc structures, with a smooth transition between adjacent arcs.

[0092] It is understandable that the structure of the above-mentioned weight-reducing groove 141 is only used as an example and is not intended to limit the structure. Other adaptable shapes may be used herein.

[0093] In some embodiments, see Fig.10 As shown, a slope 211 is provided on the side of the connecting portion 210 away from the first connecting member 120. The slope 211 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 direction of the first connecting member 120, which not only facilitates demolding, but also helps to reduce the weight of the ear module 200.

[0094] In some embodiments, see Figure 5 and Fig.10 As shown, the second connecting member 130 can be located at the top of the side beam body 110, and the first connecting member 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 in the same plane as the bottom of the side beam body 110.

[0095] A first mounting hole 131 for mounting the cover of the battery pack and a side beam sealing groove 132 are provided at the top of the second connecting member 130. The extending direction of the side beam sealing groove 132 is the same as that of the second connecting member 130. A sealing strip can be placed in the side beam sealing groove 132 when the cover is installed to seal the cover with the first side beam 100. A second mounting hole 111 is provided at the bottom of the side beam body 110. The second mounting hole 111 is used to mount the bottom guard plate of the battery pack. With this arrangement, there is no need to drill holes and open the side beam sealing groove 132 separately. Instead, the mold can be directly designed and integrally formed, thereby reducing the number of processes and the losses caused by errors in the processing process. This can effectively reduce the processing cost of the pallet in mass production and improve the consistency of the first side beam 100.

[0096] In addition, the first side beam 100 is processed by a combination of multiple molds. When processing the first side beam 100, demoulding can be performed from three directions. The ear sleeve 221, the ear reinforcement rib 222 and the second mounting hole 111 can be demoulded by moving the corresponding mold downward (negative direction of the Z axis). The first connecting member 120, the second connecting member 130, the third connecting member 140 and the connecting portion 210 can be demoulded by moving the mold in the Y direction. The first mounting hole 131 and the side beam sealing groove 132 can be demoulded by moving the mold upward (positive direction of the Z axis). At the same time, in order to facilitate demoulding, corresponding draft angles can be set on the first connecting member 120, the second connecting member 130, the third connecting member 140 and the connecting portion 210.

[0097] In some embodiments, see Figure 7 As shown, the angle between the first rib and the first connecting member 120 can be 30°-90°, and the two first ribs are symmetrically arranged on both sides of the central axis of the ear sleeve 221, so that the angle between the first connecting plate and the first connecting member 120 is 45°-90°, and the two first connecting plates are also symmetrically arranged on both sides of the central axis of the ear sleeve 221. This arrangement can effectively increase the Z-direction modal frequency of the battery pack, so that the battery pack can avoid the influence of the low-frequency area, reduce the risk of fatigue damage, and increase the life of the battery pack.

[0098] In some embodiments, see Fig.10 As shown, the first side beam 100 is provided with a boss 1112 for connecting with the liquid cooling plate 500 on the side facing the receiving portion. The boss 1112 protrudes from the side beam body 110 and extends toward the receiving portion. Of course, the boss 1112 is located at the lower part of the side beam body 110, and its bottom can be in the same horizontal plane as the bottom of the side beam body 110, and the length of the boss 1112 in the Y direction is substantially consistent with the length of the side beam body 110 in the Y direction. When the first side beam 100 is connected to the liquid cooling plate 500 by welding, continuous friction stir welding can be performed between the boss 1112 and the upper surface of the liquid cooling plate 500 to ensure good sealing at the connection.

[0099] In some embodiments, see Fig.11 As shown, the pallet body further includes at least one middle cross beam 400 , two ends of the middle cross beam 400 are connected to the two first side beams 100 , and at least one cross beam ear 430 is integrally formed on the top of the middle cross beam 400 .

[0100] The middle cross beam 400 and the cross beam hanging ear 430 are integrally die-casted, so that the middle cross beam 400 does not need to be additionally welded with a hanging ear structure, which simplifies the processing technology, and makes the vicinity of the cross beam hanging ear 430 have higher strength and high strength consistency of the middle cross beam 400.

[0101] In some embodiments, see Fig.11 and Fig.12 As shown, the middle crossbeam 400 includes a crossbeam body 410 and a support portion 420. The crossbeam body 410 and the support portion 420 have the same extension direction. A support portion 420 is provided on both sides of the extension direction of the crossbeam body 410, that is, the support portion 420 is provided at the top and the bottom of the crossbeam body 410, the support portion 420 at the bottom is connected to the liquid cooling plate 500, and the support portion 420 at the top is provided with a crossbeam ear 430 on the side away from the crossbeam body 410.

[0102] The cooperation between the support portion 420 and the beam body 410 helps to achieve lightweight. Specifically, the beam body 410 can be set as a second main rib, and the support portion 420 can be set as a secondary rib. The second main rib is perpendicular to the secondary rib. The secondary rib can provide a suitable width for the installation of the beam ear 430 and the connection with the liquid cooling plate 500, and the second main rib will not be too thick while connecting the two secondary ribs.

[0103] In some embodiments, see Fig.11 As shown, the middle cross beam 400 also includes a cross beam reinforcement rib 440, the two ends of which are connected to the two support parts 420 respectively, and a side wall of the cross beam reinforcement rib 440 is connected to the cross beam body 410, so as to improve the overall rigidity of the middle cross beam 400 by reinforcing it through the cross beam reinforcement rib 440.

[0104] Specifically, the beam reinforcement 440 includes a plurality of first reinforcement ribs 441 and a plurality of second reinforcement ribs 442. The extension direction of the first reinforcement ribs 441 is perpendicular to the extension direction of the beam body 410. The plurality of first reinforcement ribs 441 are arranged side by side between the two support portions 420 to divide the side wall of the beam body 410 into a plurality of reinforcement intervals. A second reinforcement rib 442 is arranged in each reinforcement interval, and both ends of the second reinforcement rib 442 extend to two diagonal corners of the reinforcement interval respectively. The inclination directions of adjacent second reinforcement ribs 442 are opposite. The overall stiffness of the middle beam 400 is further improved through the truss-like structure. The structure is simple and the lightweight effect is also more obvious.

[0105] It can be understood that the setting position of the first reinforcing rib 441 can be set according to the stress point of the middle crossbeam 400. For example, the stress point is mainly at the position of the crossbeam ear 430. Therefore, the first reinforcing rib 441 can be set directly below the crossbeam ear 430. The support part 420 located at the top of the crossbeam body 410 is extremely close to the connection position of the first reinforcing rib 441 and the second reinforcing rib 442, so that the position is supported by the first reinforcing rib 441 and the second reinforcing rib 442, thereby improving the overall rigidity of the middle crossbeam 400.

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

[0107] In some embodiments, see Fig.11 As shown, an avoidance gap 411 is provided on the side of the beam body 410 away from the liquid cooling plate 500, and at least one avoidance gap 411 is provided in the middle and at both ends of the beam body 410. The shape of the support portion 420 located on the side of the beam body 410 away from the liquid cooling plate 500 is adapted to the shape of the beam body 410.

[0108] The avoidance gap 411 can be used to provide space for the electrical circuits in the battery pack, which is convenient for wiring inside the battery pack. At the same time, the positions of the avoidance gaps 411 are correspondingly provided with support parts 420 and beam reinforcement ribs 440 for reinforcement, and will not affect the strength of the middle beam 400.

[0109] In addition, for the middle crossbeam 400, after many production experiments, it was found that the thickness of the crossbeam body 410, the support part 420 and the crossbeam reinforcement rib 440 are all set to 2-4 mm to meet the usage requirements in most cases.

[0110] In some embodiments, see Fig.13 and Fig.14 As shown, a first sealing groove 461, a second sealing groove 462 and a bolt hole 450 are provided on the support portion 420 located on the side of the beam body 410 away from the liquid cooling plate 500, that is, on the support portion 420 located at the top of the beam body 410, and 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, and both ends of the second sealing groove 462 are correspondingly connected to the first sealing groove 461, the first sealing groove 461 and the second sealing groove 462 are used for installing the sealing strip, and the bolt hole 450 is used for connecting with the cover plate of the battery pack.

[0111] After the bolt hole 450 is connected to the battery pack, the sealing strip can seal the gap between the cover plate and the support portion 420, so that the middle cross beam 400 and the cover plate can be sealed and connected, thereby making the accommodating portion a sealed cavity, thereby effectively protecting the battery module.

[0112] The first sealing groove 461 , the second sealing groove 462 , and the bolt hole 450 can all be directly formed during the die-casting of the middle cross beam 400 without the need for additional processing, thereby simplifying the production process of the middle cross beam 400 and reducing the cost of mass production of the middle cross beam 400 .

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

[0114] The structures of the pallets in the embodiments of the present application have been verified by the calculation method of topological optimization, and it is found that the pallets can meet the use requirements 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 achieve the optimal distribution of materials in space. The simulation can be carried out according to the following steps:

[0115] 1. Establish a simulation model: First, divide the battery pack model into grids, establish connection relationships, define material parameters, etc. Then, the envelope structures such as the ear sleeves, second connecting parts, and side beam body of the pallet side beam are taken as non-design domains, and the remaining areas within the outer envelope of the side beam are defined as design domains.

[0116] 2. Define design variables: Define design variables based on the side beam design domain, set the demolding direction to be in the horizontal plane and in the direction of both sides of the side beam; define the minimum and maximum thickness dimensions, minimum spacing, etc. of the design variables to control the generation effect of the ribs; and set the design domains of the left and right side beams to symmetrical constraints.

[0117] 3. Define load steps: Establish load analysis steps for calculating battery pack modal, extrusion, torsion and other working conditions.

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

[0119] 5. Define constraints: Use the volume fraction (or mass) response of the tray design domain as a constraint in the optimization process and define the upper limit of the remaining volume fraction (or mass) after the design domain is optimized.

[0120] 6. Define optimization objectives: Use the weighted response parameters of multiple working conditions as optimization objectives to ensure that the modal frequency, extrusion deformation, and torsional stiffness meet preset conditions.

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

[0122] In general, the tray provided in the embodiment of the present application is designed in combination with the results of topological optimization, and it takes into account the mechanical properties under multiple working conditions such as vibration and pressurization, so that the tray has a reasonable force transmission path under different working conditions, so that the battery pack has a high modal frequency and small extrusion deformation, thereby improving the safety of the battery pack.

[0123] An embodiment of the present application also provides a battery pack, which includes a battery pack body and the tray in the above embodiment. The battery pack body may include corresponding components such as a cover plate, a battery module, and a cooling system, wherein the tray can be connected to the cover plate of the battery pack to seal the accommodating part, and the battery module is located in the accommodating part and protected by the cover plate and the tray.

[0124] It is understandable that the structure of each component in the battery pack, the working principle of the battery pack, and the connection method of each component are all well known to technicians in this field, and will not be described in detail in this embodiment.

[0125] The embodiment of the present application also provides an electrical device, which includes a device body and a battery pack, and the battery pack is connected to the device body through components such as a lifting ear module 200 and a beam lifting ear 430.

[0126] It can be understood that the electrical equipment in this embodiment includes but is not limited to electric vehicles, hybrid vehicles, energy storage systems, consumer electronic products, medical equipment, drones, power tools and other equipment that require the use of battery packs.

[0127] Finally, it should be noted that those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application content disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application, is not limited to the precise structure described above and shown in the drawings, and can be modified and changed in various ways without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A pallet, characterized in that: It comprises a tray body and a lug module (200), wherein first side beams (100) are arranged on opposite sides of the tray body, and a plurality of the lug modules (200) are integrally formed on the sides of two first side beams (100) facing away from each other, and the plurality of lug modules (200) are arranged at intervals along the extension direction of the first side beams (100).

2. The pallet according to claim 1, characterized in that: The lifting eye module (200) comprises a lifting eye portion (220) and at least one connecting portion (210) arranged on the lifting eye portion (220), and both the lifting eye portion (220) and the connecting portion (210) are connected to the first side beam (100).

3. The pallet according to claim 2, characterized in that: The lifting ear portion (220) comprises a lifting ear sleeve (221) and at least two lifting ear reinforcement ribs (222); the lifting ear sleeve (221) is connected to the first side beam (100); a connecting hole (223) for inserting a bolt is provided on the lifting ear sleeve (221); one end of the lifting ear reinforcement rib (222) is connected to the lifting ear sleeve (221), and the other end is connected to the connecting portion (210).

4. The pallet according to claim 3, characterized in that: The connecting portion (210) is a first connecting plate, and two connecting portions (210) are provided, and are respectively arranged on both sides of the hanging ear portion (220).

5. The pallet according to claim 3, characterized in that: The first side beam (100) comprises a side beam body (110) and a first connecting member (120) arranged on the side beam body (110); the extension direction of the first connecting member (120) is the same as the extension direction of the side beam body (110); the first connecting member (120) is provided with a through hole that cooperates with the connecting hole (223); the hanging ear sleeve (221) and the connecting portion (210) are both connected to the first connecting member (120); and the connecting portion (210) is also connected to the side beam body (110).

6. The pallet according to claim 5, characterized in that: A slope (231) is provided on the side of the connecting portion (210) facing away from the first connecting member (120), and the slope (231) is located at the end of the connecting portion (210) facing away from the side beam body (110).

7. The pallet according to claim 5, characterized in that: The angle between the connecting portion (210) and the first connecting member (120) is 45°-90°.

8. The pallet according to claim 5, characterized in that: The side beam body (110) is provided with a second connecting member (130) and at least one third connecting member (140); the extension direction of the second connecting member (130) is the same as the extension direction of the side beam body (110); the third connecting member (140) is respectively connected to the second connecting member (130) and the first connecting member (120); and the ear module (200) is located on a side of the first connecting member away from the second connecting member (130).

9. The pallet according to claim 8, characterized in that: The third connecting member (140) is arranged in a one-to-one correspondence with the lifting ear portion (220), and the third connecting member (140) includes two first ribs arranged opposite to each other, one end of the first rib is connected to the first connecting member (120), and the other end is connected to the second connecting member (130).

10. The pallet according to claim 9, characterized in that The included angle between the first rib and the first connecting member (120) is 30°-90°.

11. The pallet according to claim 9, characterized in that At least one weight-reducing groove (141) is provided on a side of the first rib facing away from the side beam body (110).

12. The pallet according to claim 8, characterized in that A plurality of avoidance grooves (111) are arranged at intervals on a side of the first connecting member (120) facing away from the side beam body (110), and a mounting portion (112) is formed between adjacent avoidance grooves (111); a projection of the second connecting member (130) on the first connecting member (120) is located within the mounting portion (112), and the hanging ear sleeve (221) and the connecting portion (210) are both connected to the mounting portion (112).

13. The pallet according to any one of claims 1 to 12, characterized in that: The tray body also includes a liquid cooling plate (500) and two second side beams (300), wherein the two second side beams (300) are connected to two ends of the first side beam (100) respectively, and the first side beam (100) and the second side beam (300) are arranged around the liquid cooling plate (500) to enclose a receiving portion on the liquid cooling plate (500).

14. The pallet according to claim 13, characterized in that A boss (132) for connecting to the liquid cooling plate (500) is provided on one side of the first side beam (100) facing the accommodating portion.

15. The pallet according to claim 13, characterized in that The pallet body further comprises at least one middle crossbeam (400), the two ends of the middle crossbeam (400) being connected to the two first side beams (100) respectively, and at least one crossbeam hanging ear (430) being integrally formed on the top of the middle crossbeam (400).

16. The pallet according to claim 15, characterized in that The intermediate crossbeam (400) comprises a crossbeam body (410) and a support portion (420), the crossbeam body (410) and the support portion (420) extending in the same direction, a support portion (420) being arranged on both sides of the extending direction of the crossbeam body (410), one support portion (420) being connected to the liquid cooling plate (500), and the other support portion (420) being arranged on a side away from the crossbeam body (410) with the crossbeam hanging ear (430).

17. The pallet according to claim 16, characterized in that The intermediate crossbeam (400) further comprises a crossbeam reinforcement rib (440), two ends of the crossbeam reinforcement rib (440) are connected to the two support portions (420) respectively, and a side wall of the crossbeam reinforcement rib (440) is connected to the crossbeam body (410).

18. The pallet according to claim 17, characterized in that The crossbeam reinforcement ribs (440) include a plurality of first reinforcement ribs (441) and a plurality of second reinforcement ribs (442), wherein the extension direction of the first reinforcement ribs (441) is perpendicular to the extension direction of the crossbeam body (410), and the plurality of first reinforcement ribs (441) are arranged side by side between the two support portions (420) to separate the side wall of the crossbeam body (410) into a plurality of reinforcement sections, wherein a second reinforcement rib (442) is arranged in each reinforcement section, and the two ends of the second reinforcement rib (442) extend to two diagonally opposite corners of the reinforcement section, and the inclination directions of adjacent second reinforcement ribs (442) are opposite.

19. The pallet according to claim 16, characterized in that An avoidance notch (411) is provided on the side of the beam body (410) facing away from the liquid cooling plate (500), and at least one avoidance notch (411) is provided in the middle and at both ends of the beam body (410)(410). The shape of the support portion (420) located on the side of the beam body (410) facing away from the liquid cooling plate (500) is adapted to the shape of the beam body (410).

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

21. A battery pack, characterized in that: It comprises a battery pack body and the tray according to any one of claims 1 to 20, wherein the battery pack body and the tray are connected.

22. An electrical equipment, characterized in that: It comprises a device body and the battery pack according to claim 21, wherein the battery pack is fixed on the device body.

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