Tray structure, battery box body, battery pack and vehicle

Abstract

The utility model discloses a tray structure, a battery box body, a battery pack and a vehicle, the bottom structure of the tray structure is provided with a composite structure body, the use strength is high, and the requirement for protecting parts such as battery cells in the tray structure can be met; the liquid cooling flow channel and an external pipeline can form a fluid circulation loop, heat exchange with the battery cell can be carried out, and the heat management control requirement of the battery cell is met, that is, the bottom structure of the tray structure integrates the protection plate and the liquid cooling plate, the assembling efficiency of the battery box body can be improved, the tray structure is more compact, and under the same size, the assembly efficiency of the battery box body is improved. The internal space of the tray structure can be larger, the capacity of accommodating the battery cells is improved, the battery energy density of the battery pack is further improved, the weight of the tray structure is lighter, the lightweight design requirement of the battery box body is met, and the manufacturing cost of the battery pack can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of control, in particular to a tray structure, a battery box, a battery pack and a vehicle. BACKGROUND

[0002] The battery pack is one of the important components of a new energy vehicle. The battery pack includes a battery box, and the battery box specifically includes a frame body. A bottom guard plate is mounted at the bottom of the frame body, and a support pad and a liquid cooling plate are mounted above the bottom guard plate. The support pad is located between the liquid cooling plates and mainly serves to buffer and absorb energy. The liquid cooling plate serves to provide thermal management for the battery cells. In the prior art, the liquid cooling plate and the frame body are usually connected together by welding or / and riveting, and the bottom guard plate is fixedly connected with the frame body by welding, riveting or bolt connection.

[0003] As can be seen from the above description, the structure of the battery box in the prior art includes a plurality of independent components, and the assembly is time-consuming and laborious, and the assembly efficiency is relatively low.

[0004] How to optimize the structure of the battery box and improve the assembly efficiency is a technical problem that needs to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a tray structure for a battery box, which integrates at least protection and liquid cooling functions, and can improve the assembly efficiency of the battery box. Another purpose of the present application is to provide a battery box, a battery pack and a vehicle comprising the above-mentioned tray structure.

[0006] The present application provides a tray structure of a battery box, which includes a bottom structure, and the bottom structure includes a composite structure body, the composite structure body includes a first plate, a sandwich structure and a second plate, the sandwich structure is located between the first plate and the second plate, and the first plate is formed with a liquid cooling flow channel.

[0007] In the embodiment of the present application, the bottom structure of the tray structure has a composite structure body, which has a relatively high strength and can meet the demand of protecting the internal components such as battery cells of the tray structure. The first plate of the tray structure integrates a liquid cooling flow channel, and the liquid cooling flow channel and the external pipeline can form a fluid circulation loop, which can exchange heat with the battery cells to meet the thermal management control demand of the battery cells. That is, the bottom structure of the tray structure of the present application integrates the guard plate and the liquid cooling plate, which can improve the assembly efficiency of the battery box. Moreover, the structure of the tray structure is more compact, the internal space of the tray structure can be larger under the same volume, the capacity of accommodating battery cells is improved, thereby the battery energy density of the battery pack is improved, and the weight of the tray structure is lighter, which meets the lightweight design demand of the battery box and can reduce the manufacturing cost of the battery pack.

[0008] In an example, the bottom structure further comprises a heat-conducting plate, the first plate has at least one recess and at least one convex portion on a side facing away from the sandwich structure, the heat-conducting plate is supported on the convex portion, and the liquid cooling flow channel is formed between the recess and the heat-conducting plate.

[0009] In an example, the tray structure further comprises an adhesive layer arranged between the heat-conducting plate and the convex portion, and the heat-conducting plate and the convex portion are connected by adhesive bonding.

[0010] In an example, the tray structure further comprises at least one mounting body connected to a surface of the heat-conducting plate facing the first plate, the mounting body passes through the convex portion and is at least partially embedded in an interior of the composite structure;

[0011] The tray structure further comprises a connecting piece connecting the mounting body from a side of the second plate to lock the heat-conducting plate and the composite structure.

[0012] In an example, an end of the mounting body away from the heat-conducting plate is located in the interior of the composite structure, and the mounting body abuts against the second plate, and the connecting piece connects the mounting body through the second plate.

[0013] In an example, the tray structure further comprises at least one reinforcing plate, and the second plate is provided with the reinforcing plate at a partial position of a side facing the sandwich structure.

[0014] Alternatively, the tray structure further comprises at least one reinforcing plate, and the second plate is provided with the reinforcing plate at a partial position of a side facing the sandwich structure, and the mounting body abuts against the reinforcing plate.

[0015] In an example, the composite structure comprises a connected intermediate portion and a peripheral portion, and the peripheral portion protrudes toward an opening direction of the battery box relative to the intermediate portion to form a support platform.

[0016] In an example, the tray structure further comprises a circumferential side plate, the circumferential side plate is a single plate structure, the circumferential side plate is circumferentially connected with the bottom structure to enclose a receiving cavity, and an opening is formed on a side away from the bottom structure.

[0017] The circumferential side plate is formed by extension of one of the first plate or the second plate; or the circumferential side plate and the composite structure are separate structures, and the circumferential side plate is connected to the peripheral portion.

[0018] In an example, an end of the circumferential side plate away from the peripheral portion has a turned-up portion, and the turned-up portion is used to abut against a frame assembly of the battery box.

[0019] The application also provides a battery box, comprising:

[0020] The tray structure of the battery box according to any one of the above;

[0021] The frame assembly comprises a plurality of side beams, each of which surrounds the periphery of the tray structure, and the tray structure is connected with the side beams.

[0022] In an example, the bottom end of the side beam has an extension bent towards the position of the tray structure, and the peripheral part of the composite structure is at least partially supported on the extension;

[0023] Alternatively / and, the side beam and the periphery of the tray structure have an adhesive layer therebetween, and the side beam is connected with the periphery of the tray structure through the adhesive layer;

[0024] Alternatively / and, the opening position of the tray structure has a flange part, and the flange part is fixedly connected with the top of the side beam;

[0025] Alternatively / and, further comprising a support beam connected to the inside of the tray structure, and an adhesive layer is arranged between the support beam and the tray structure.

[0026] The application also provides a battery pack, comprising at least one battery cell and the battery box described above, and the battery cell is located in the inside of the tray structure.

[0027] In addition, the application also provides a vehicle, comprising a vehicle body and the battery pack described above, and the battery pack is mounted on the vehicle body.

[0028] The battery box, the battery pack and the vehicle in the embodiments of the application have the tray structure described above, so the battery box, the battery pack and the vehicle also have the technical effects of the tray structure. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the battery box in an embodiment of the application;

[0030] Figure 2 It is a structural schematic diagram of the battery box in an embodiment of the application; Figure 1 It is an exploded schematic diagram of the battery box shown in the figure;

[0031] Figure 3 It is a structural schematic diagram of the battery box in an embodiment of the application; Figure 1 It is a local position schematic diagram of the tray structure and the side beam in the embodiment;

[0032] Figure 4 It is a local position schematic diagram of the tray structure and the side beam in the embodiment; Figure 1 It is a local schematic diagram of the heat-conducting plate and the bottom structure connection position in the embodiment;

[0033] Figure 5 It is a local schematic diagram of the heat-conducting plate and the bottom structure connection position in the embodiment;Figure 1 Partial view of the middle position of the middle support beam and the bottom structure;

[0034] Figure 6 For Figure 1 Partial enlarged view of the two end portions of the middle support beam, the circumferential side plate, and the support platform position.

[0035] Among them, Figures 1 to 6 The middle figure mark is explained as follows:

[0036] 100 tray structure; 10 bottom structure; 11 composite structure, 111 first plate; 111A liquid cooling channel; 1111 recess; 1112 convex part; 112 interlayer structure; 113 second plate; 114 heat conduction plate; 115 mounting body; 116 connecting piece; 117 reinforcing plate; 11-1 middle part; 11-2 peripheral part; 118 support platform; 12 circumferential side plate; 13 flange part; 100A adhesive layer;

[0037] 200 frame assembly; 20 edge beam; 21 extension;

[0038] 300 support beam; 310 corner connecting block. DETAILED DESCRIPTION

[0039] Please refer to Figures 1 to 6 , Figure 1 Structure schematic diagram of the battery box in an embodiment of the present application; Figure 2 For Figure 1 Exploded schematic diagram of the battery box shown; Figure 3 For Figure 1 Partial position schematic diagram of the tray structure and the edge beam; Figure 4 For Figure 1 Partial schematic diagram of the connecting position of the heat conduction plate and the bottom structure; Figure 5 For Figure 1 Partial schematic diagram of the middle position of the middle support beam and the bottom structure; Figure 6 For Figure 1 Partial enlarged view of the two end portions of the middle support beam, the circumferential side plate, and the support platform position.

[0040] The embodiment of the present application provides a tray structure 100 for a battery box. The battery box can be applied to an electric device, such as a vehicle, an electric vehicle, an electric toy, an electric tool, an electric vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an aircraft, a rocket, a space shuttle, and a spacecraft, etc. The battery pack mainly provides electric energy for the electric device such as a vehicle. The present application takes the battery pack applied to a vehicle as an example to continue to introduce the technical scheme and technical effect. Although the drawings of the present application do not show the vehicle body, the electric core and other parts, but it does not hinder the understanding and implementation of the above-mentioned content by those skilled in the art.

[0041] In the embodiments of the present application, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle includes a vehicle body, and the battery pack is installed on the vehicle body. The battery pack can be arranged at the bottom, the head or the tail of the vehicle. The battery pack can be used for power supply of the vehicle, for example, the battery pack can be used as the operating power supply of the vehicle. In some embodiments of the present application, the battery pack can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0042] In the embodiments of the present application, the battery pack includes a battery box body, and the battery box body includes a tray structure 100 and a frame assembly 200. The tray structure 100 has an opening on one side, and the frame assembly 200 includes a plurality of side beams 20. Each side beam 20 is arranged around the circumference of the tray structure 100, and the side beams 20 and the tray structure 100 are connected by a plurality of connecting rods 30. Figure 1 And Figure 2 It can be seen that all the side beams 20 form a ring structure, and the ring structure is arranged around the periphery of the tray structure 100. The side beams 20 and the tray structure 100 can be connected by screws or rivets, and a glue layer 100A can also be arranged at a local position. The side beams 20 and the tray structure 100 are connected by the glue layer 100A.

[0043] Generally, a plurality of battery cells are installed inside the tray structure 100. The battery cell refers to the smallest unit of a battery pack or a battery group. The battery cells are stacked in a first direction to form a column of battery cell groups. The number of battery cells in a column of battery cell groups is generally several, for example, two or more. The specific number of battery cells depends on the specific product. Of course, it is also not excluded that in some embodiments, a column of battery cell groups includes one battery cell. The first direction is the direction of the stacking of the battery cells in the battery cell group. The battery box body can have a column of battery cell groups, and of course, at least two columns of battery cell groups can be arranged in a second direction. The battery cells can be assembled to form a battery cell group first, and the battery cell group is installed in the battery box body as a whole. Each battery cell group forms a battery pack. Of course, the battery cells can also be installed one by one in the battery box body to directly form a battery pack. Although the above installation mode of the battery cells is not shown, it does not hinder the understanding of the above description by those skilled in the art.

[0044] In order to meet the installation requirements of the battery cells and other parts, the battery pack further includes a support beam 300. The number, shape and installation position of the support beam 300 can be reasonably selected according to the specific structure of the battery pack. The support beam 300 is fixed inside the tray structure 100, and can provide an installation basis for the battery cells and other parts. The support beam can be a profile member formed by pultrusion of a composite material, which has high strength and light weight. The support beam 300 in the present application can be fixed in the tray by the adhesive layer 100A. The adhesive structure is simple and light in weight.

[0045] In the embodiments of the present application, the battery pack usually further comprises a cover plate, which covers the opening position of the tray structure 100 to realize the closure of the internal space of the tray structure 100. The cover plate is not shown in the drawings, but does not hinder the understanding of those skilled in the art.

[0046] In the embodiments of the present application, the tray structure 100 comprises the bottom structure 10 and the circumferential side plate 12 connected to each other, which enclose a structure with one end closed and one end open. The bottom structure 10 and the circumferential side plate 12 enclose a receiving cavity, and the above-mentioned battery cells and support beams and the like components are located in the receiving cavity. The bottom structure 10 in the embodiments of the present application comprises a composite structure 11, which comprises a first plate 111, a sandwich structure 112 and a second plate 113, and the sandwich structure 112 is located between the first plate 111 and the second plate 113. The first plate 111 and the second plate 113 can form a closed space, and the sandwich structure 112 is completely wrapped in the closed space, and the first plate 111, the second plate 113 and the sandwich structure 112 are formed together by die molding. The composite structure 11 can be a sandwich structure with a three-layer structure, and of course it can also be a structure with more than three layers, such as a structure composed of more than four layers. In this paper, the sandwich structure 11 is taken as an example to introduce the technical scheme and technical effect.

[0047] Generally, the density of the first plate 111 and the second plate 113 can be greater than that of the sandwich structure 112, the thickness of the first plate 111 and the thickness of the second plate 113 are less than that of the sandwich structure 112, and the sandwich structure 112 can be a foam structure (such as aerogel-based composite foam aluminum plate) or a honeycomb structure (such as honeycomb aluminum). Of course, the sandwich structure 112 can also be formed by intersecting structural members. The first plate 111 and the second plate 113 can be single-plate structures, and the first plate 111 and the second plate 113 can be metal plates, such as aluminum plates, aluminum alloy plates, steel plates and the like. Of course, the first plate 111 and the second plate 113 can be non-metal members, such as reinforced plastic plates.

[0048] In the embodiments of the present application, the first plate 111 is provided with a liquid cooling flow channel 111A on the side facing the battery cell, and the liquid cooling flow channel 111A can be uniformly arranged on the first plate 111. The liquid cooling flow channel 111A can be one flow channel with one inlet and one outlet, and of course the liquid cooling flow channel 111A can also be multiple independent flow channels. As for the arrangement of the liquid cooling flow channel 111A, this paper does not make too much description, as long as it can meet the heat management requirements of each battery cell in the receiving cavity of the tray structure 100.

[0049] In the embodiment of the present application, the bottom structure 10 of the tray structure 100 has a composite structure 11, which has relatively high strength and can meet the requirement of protecting the internal components such as the battery cells of the tray structure 100. The first plate 111 of the tray structure 100 is integrated with a liquid cooling channel 111A. The liquid cooling channel 111A and the external pipeline can form a fluid circulation loop, which can exchange heat with the battery cells to meet the thermal management control requirement of the battery cells. That is, the bottom structure 10 of the tray structure 100 of the present application integrates the protective plate and the liquid cooling plate, which can improve the assembly efficiency of the battery box, and the structure of the tray structure 100 is more compact. Under the same volume, the internal space of the tray structure 100 can be larger, which improves the capacity of accommodating battery cells, thereby improving the battery energy density of the battery pack. Moreover, the weight of the tray structure 100 is lighter, which meets the lightweight design requirement of the battery box and can reduce the manufacturing cost of the battery pack.

[0050] In the embodiment of the present application, the bottom structure 10 further includes a heat conduction plate 114. The first plate 111 has at least one recess 1111 and at least one convex portion 1112 on the side away from the sandwich structure 112. The heat conduction plate 114 is supported on the convex portion 1112. The convex portion 1112 can be a planar structure, and the convex portion 1112 can be in contact with the heat conduction plate 114. The liquid cooling channel 111A is formed between the recess 1111 and the heat conduction plate 114. The first plate 111 can form the recess 1111 and the convex portion 1112 by stamping or the like. All or several recesses 1111 can be connected to form a continuous flow channel. Of course, each recess 1111 can also be independent to form a separate flow channel.

[0051] The heat conduction plate 114 can be made of a heat conductive material to transfer the heat of the fluid in the liquid cooling channel 111A to the battery cells. The heat conduction plate 114 can be a metal plate. The heat conduction plate 114 can play a role in uniform temperature. In this embodiment, the first plate 111 and the heat conduction plate 114 cooperate to form a closed liquid cooling channel 111A, which has a simple forming process and low processing difficulty.

[0052] The heat conduction plate 114 can be connected to the convex portion 1112 through the adhesive layer 100A. This connection method is relatively simple and is conducive to reducing the weight of the tray structure 100.

[0053] In order to improve the fixing reliability of the heat-conducting plate 114, the surface of the heat-conducting plate 114 towards the first plate 111 is connected with a mounting body 115, and the heat-conducting plate 114 can be provided with at least one mounting body 115, of course, more than two mounting bodies 115 can also be provided, and the mounting bodies 115 are dispersed on the surface of the heat-conducting plate 114. The mounting body 115 is opposite to the convex part 1112 of the first plate 111, and the composite structure 11 can have a through hole penetrating through the convex part 1112, the mounting body 115 penetrates through the through hole on the convex part 1112 and is at least partially embedded in the inside of the composite structure 11. The mounting body 115 can be a metal body, of course, it can also be a non-metal body. The tray structure 100 further comprises a connecting piece 116, which connects the mounting body 115 from the side of the second plate 113 to lock the heat-conducting plate 114 and the composite structure 11.

[0054] In this embodiment, the mounting body 115 and the connecting piece 116 cooperate to realize the mechanical locking of the heat-conducting plate 114 and the composite structure 11, further fix the heat-conducting plate 114, improve the sealing between the heat-conducting plate 114 and the first plate 111, and further avoid the leakage of the liquid cooling flow channel 111A, thereby improving the safety of the battery pack.

[0055] The mounting body 115 can be provided with an internally threaded hole, for example, the mounting body 115 can be a threaded sleeve, the connecting piece 116 can have an external thread matched with the internally threaded hole, and the connecting piece 116 can be a bolt. The threaded connection is fast and convenient to connect. The bolt is generally selected as M5 / M6 specifications, and the bolt fixing point spacing is between 40mm-100mm.

[0056] In an example, the end of the mounting body 115 away from the heat-conducting plate 114 is located inside the composite structure 11, so that the installation of the mounting body 115 does not occupy the external space of the battery box, the battery box occupies a smaller space, and a larger installation space is provided for the external components of the battery box. In the embodiment of the application, the mounting body 115 abuts against the second plate 113, and the connecting piece 116 penetrates through the second plate 113 to connect the mounting body 115, so that the mounting body 115 abuts against the second plate 113, thereby reducing the risk of deformation of the composite structure 11 caused by the locking of the mounting body 115 and the connecting piece 116.

[0057] Figure 4As shown in the figure, a reinforcing plate 117 is arranged at a partial position of the inner side of the second plate 113, and the reinforcing plate 117 is located at the side of the second plate 113 facing the base structure. The reinforcing plate 117 is also a single plate structure, and the mounting body 115 is indirectly abutted to the second plate 113 through the reinforcing plate 117. Of course, the mounting body 115 can also be directly abutted to the second plate 113. The reinforcing plate 117 improves the strength of the composite structure 11 to a certain extent, and the reinforcing plate 117 is arranged at the position where the composite structure 11 is provided with the through hole, so that the influence of the through hole of the composite structure 11 on the overall strength of the composite structure 11 can be reduced. The reinforcing plate 117 can be an integral structure with the second plate 113, and of course the reinforcing plate 117 can also be previously fixed to the second plate 113 by means of adhesion or welding.

[0058] In the embodiment of the present application, the composite structure 11 can be an equal-thickness structure, and of course can also be a non-equal-thickness structure. The composite structure 11 includes the connected intermediate part 11-1 and the peripheral part 11-2, and the surface of the first plate 111 in the peripheral part 11-2 is higher than the surface of the first plate 111 in the intermediate part 11-1. In this way, the peripheral part 11-2 protrudes to the side away from the second plate 113 relative to the intermediate part 11-1, that is, the peripheral part 11-2 protrudes to the opening direction of the battery box relative to the intermediate part 11-1, and can be used as a support table 118. The surface of the support table 118 facing the opening of the tray structure 100 can be a plane, and of course can also be a non-plane. The support table 118 can assist in supporting the end of the support beam 300, and the end of the support beam 300 can be supported on the support table 118. The support beam 300 and the support table 118 can also be adhesively fixed through the adhesive layer 100A.

[0059] Of course, the support beam and the intermediate part 11-1 can also be provided with the adhesive layer 100A to further fix the support beam 300. The thickness of the adhesive layer 100A is about 0.2mm to 1.5mm, and the width of the adhesive layer 100A is not less than 80% of the overlapping area of the two regions.

[0060] In order to improve the reliability of the fixation of the support beam 300, the tray structure 100 can further include a corner connecting block 310 installed at the corner position of the support beam 300 and the circumferential side plate 12. The corner connecting block 310 has a first connecting wall and a second connecting wall, and the first connecting wall and the second connecting wall are arranged at an angle, for example, the included angle between the first connecting wall and the second connecting wall can be greater than ninety degrees. The first connecting wall is fixed to the side wall of the support beam 300, and the second connecting wall is fixed to the circumferential side plate 12. The first connecting wall and the corner connecting block 310, and the second connecting wall and the corner connecting block 310 can be fixed by adhesion.

[0061] The lower end of the corner connecting block 310 can be supported on the support table, so that the installation position of the corner connecting block 310 is relatively stable, and the tray structure 100 is beneficial to form a stable force bearing structure.

[0062] In this embodiment, the thickness of the adhesive layer 100A is about 0.2mm to 1.5mm, and the width of the adhesive layer 100A is not less than 70% of the overlapping area, so as to improve the connection reliability.

[0063] In the embodiment of the present application, the bottom structure 10 of the tray structure 100 bears a relatively large weight, and a composite structure 11 can be used, while the force borne by the circumferential side wall is relatively small, and a single plate structure can be used. The tray structure 100 further comprises a circumferential side plate 12, which is a single plate structure. The circumferential side plate 12 can be a metal plate, and the circumferential side plate 12 is circumferentially connected to the bottom structure 10 and forms an opening on the side away from the bottom structure 10. The circumferential side plate 12 can be formed by extending one of the first plate 111 or the second plate 113; or the circumferential side plate 12 and the composite structure 11 are separate structures, and the circumferential side plate 12 is connected to the peripheral part 11-2.

[0064] In the embodiment of the present application, the circumferential side plate 12 has a flange part 13 at the end away from the peripheral part 11-2, and the flange part 13 is in abutment with the frame assembly 200 of the battery box. The flange part 13 and the frame assembly 200 can be connected by riveting screws or bolts, and an adhesive layer 100A can be further arranged between the flange part 13 and the frame assembly 200, which plays a buffering role.

[0065] In the embodiment of the present application, the bottom end of the edge beam 20 of the frame assembly 200 has an inward extension 21, and the peripheral part 11-2 of the composite structure 11 is at least partially supported on the extension 21. This is beneficial to form an integral whole of the tray structure 100 and the frame assembly 200, and the force bearing performance of the two is good.

[0066] In the embodiment of the present application, the abutment part of the tray structure 100 is bonded to the edge beam 20, the circumferential side plate 12 of the tray structure 100 is bonded to the edge beam 20, and the bottom structure 10 of the tray structure 100 is bonded to the edge beam 20. Through the bonding of the upper, middle and lower positions, the tray structure 100 and the frame assembly 200 form a stable structure, and the width of the adhesive layer 100A in each area is at least 20mm.

[0067] In the embodiment of the present application, the tray structure 100 can form a containing cavity for containing components such as battery cells, and the sealing requirement of the tray structure 100 and the frame assembly 200 can be eliminated, thereby reducing the assembly difficulty.

[0068] As can be known from the above description, the battery pack in the embodiment of the present application comprises at least one battery cell and the battery box of any one of the above embodiments, and the battery cell is located inside the tray structure 100.

[0069] The battery box, the battery pack and the vehicle in the embodiments of the present application have the tray structure 100 described above, so the battery box, the battery pack and the vehicle also have the technical effects of the tray structure 100 described above.

[0070] For other structures of the battery pack and the vehicle, please refer to the current technology, and the present application will not be described here.

[0071] In the description of the embodiments of the present application, the terms "comprising", "containing" or any other variants thereof are intended to cover non-exclusive containing, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0072] In the embodiments of the present application, "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0073] The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A tray structure for a battery box, characterized in that, Includes a bottom structure (10), the bottom structure (10) includes a composite structure (11), the composite structure (11) includes a first plate (111), a sandwich structure (112) and a second plate (113), the sandwich structure (112) is located between the first plate (111) and the second plate (113), and the first plate (111) has a liquid cooling channel (111A).

2. The tray structure of the battery box according to claim 1, characterized in that, The bottom structure (10) further includes a heat-conducting plate (114), the first plate (111) having at least one recess (1111) and at least one protrusion (1112) on the side opposite to the sandwich structure (112), the heat-conducting plate (114) being supported on the protrusion (1112), and the liquid cooling channel (111A) being formed between the recess (1111) and the heat-conducting plate (114).

3. The tray structure of the battery box according to claim 2, characterized in that, The tray structure also includes an adhesive layer (100A), which is disposed between the heat-conducting plate (114) and the protrusion (1112). The heat-conducting plate (114) and the protrusion (1112) are bonded together by the adhesive layer (100A).

4. The tray structure of the battery box according to claim 2, characterized in that, The tray structure further includes at least one mounting body (115) connected to the surface of the heat-conducting plate (114) facing the first plate (111), the mounting body (115) passing through the protrusion (1112) and at least partially embedded in the interior of the composite structure (11); The tray structure also includes a connector (116) that connects the mounting body (115) from one side of the second plate (113) to lock the heat-conducting plate (114) and the composite structure (11).

5. The tray structure of the battery box according to claim 4, characterized in that, The end of the mounting body (115) away from the heat-conducting plate (114) is located inside the composite structure (11), and the mounting body (115) abuts against the second plate (113), and the connector (116) passes through the second plate (113) to connect the mounting body (115).

6. The tray structure of the battery box according to claim 5, characterized in that, The tray structure further includes at least one reinforcing plate (117), and the second plate (113) is provided with the reinforcing plate (117) on a portion of its side facing the sandwich structure (112). Alternatively, the tray structure may further include at least one reinforcing plate (117), wherein the second plate (113) is provided with the reinforcing plate (117) at a portion of its side facing the sandwich structure (112), and the mounting body (115) abuts against the reinforcing plate (117).

7. The tray structure of the battery box according to any one of claims 1 to 6, characterized in that, The composite structure (11) includes a connected intermediate portion (11-1) and a peripheral portion (11-2), wherein the surface of the first plate (111) in the peripheral portion (11-2) is higher than the surface of the first plate (111) in the intermediate portion (11-1).

8. The tray structure of the battery box according to claim 7, characterized in that, The pallet structure also includes a circumferential side plate (12), which is a single-plate structure. The circumferential side plate (12) is circumferentially connected to the bottom structure (10) to form a receiving cavity and forms an opening on the side away from the bottom structure (10). The circumferential side plate (12) is formed by extending one of the first plate (111) or the second plate (113); or the circumferential side plate (12) and the composite structure (11) are separate structures, and the circumferential side plate (12) is connected to the peripheral part (11-2).

9. The tray structure of the battery box according to claim 8, characterized in that, The circumferential side plate (12) has a flange (13) at the end away from the peripheral portion (11-2), and the flange (13) is used to abut against the frame assembly (200) of the battery box.

10. A battery housing, characterized in that, include: The tray structure of the battery box according to any one of claims 1 to 9; A border assembly (200) includes a plurality of side beams (20), each of the side beams (20) surrounding the circumference of the pallet structure, and the pallet structure is connected to the side beams (20).

11. The battery housing according to claim 10, characterized in that, The bottom end of the side beam (20) has an extension (21) that bends toward the location of the pallet structure, and the periphery (11-2) of the composite structure (11) is at least partially supported by the extension (21). Alternatively / and, the side beam (20) has an adhesive layer (100A) between it and the pallet structure, and the side beam (20) is circumferentially bonded to the pallet structure through the adhesive layer (100A); Alternatively / and, the opening of the pallet structure has a flange (13), which is bonded and fixed to the top of the side beam (20); Alternatively and / or, it also includes a support beam (300) connected to the interior of the pallet structure, and an adhesive layer (100A) is provided between the support beam (300) and the pallet structure.

12. A battery pack, characterized in that, It includes at least one battery cell and a battery housing as described in claim 10 or 11, wherein the battery cell is located inside the tray structure.

13. A vehicle, characterized in that, It includes a vehicle body and the battery pack of claim 12, wherein the battery pack is mounted on the vehicle body.

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