Battery device and power utilization device with same

Abstract

The utility model discloses a battery device and a power utilization device with the battery device, and the battery device comprises a main box which defines a containing cavity; the battery monomers are arranged in the accommodating cavity; the mounting beam is mounted on the bottom wall of the main box, and an avoiding channel is formed between the mounting beam and the bottom wall; the first expansion beams are detachably mounted on the mounting beams and are matched with the battery monomers; and the heat management piece is arranged in the accommodating cavity, is matched with the battery monomers in a heat exchange manner, and is provided with an inlet part and an outlet part, and at least one of the inlet part and the outlet part is arranged in the avoiding channel in a penetrating manner. According to the technical scheme, the heat management part can be installed prior to the first expansion beam, the mutual influence between the installation of the first expansion beam and the installation of the heat management part can be reduced, the installation efficiency is higher, meanwhile, the first expansion beam and the installation beam can be subjected to respective needed surface treatment, the flexibility of surface treatment can be improved, the treatment cost is saved, and the installation efficiency is improved. The production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device and an electrical device having the same. Background Art

[0002] In a battery device, the contact areas between the box body and the cold plate and the module need to be insulated and sprayed. In addition, for a sheet metal box body, in order to ensure that it does not rust during long-term use, the entire box body also needs to be subjected to surface electrophoresis treatment. For the solution of a heat exchanger with a U-shaped heat exchange tube built in the sheet metal box body, a structural adhesive needs to be applied to the contact interface between the bottom of the heat exchanger and the box body to ensure good fitting between the heat exchanger and the box body without deformation or warping; and the water inlet and outlet of the U-shaped heat exchange tube need to be arranged outside the expansion beam, and the expansion beam on the side of the water inlet and outlet of the heat exchange tube needs to avoid the water inlet and outlet of the U-shaped heat exchange tube; therefore, during assembly, the heat exchanger needs to be first installed on the bottom plate of the box body and then the expansion beam is welded.

[0003] In the related art, the box body is manufactured in the following manner.

[0004] Solution 1: Neither the heat exchanger nor the surface of the box body is treated. After applying glue to the interface between the heat exchanger and the box body, the heat exchanger is adhered to the box body, the expansion beam is welded, and then the entire box body is placed in an electrophoresis tank for electrophoresis. After electrophoresis is completed, the contact area between the box body and the module is subjected to insulation spraying.

[0005] However, in this solution: the electrophoresis liquid cannot penetrate into the contact interface between the box body and the heat exchanger, and there is a long-term corrosion risk; after applying glue to the interface between the heat exchanger and the box body and then performing electrophoresis, the electrophoresis liquid will wash away the glue, resulting in poor adhesion between the heat exchanger and the box body; after electrophoresis is completed and then insulation spraying is carried out, since the insulation spraying must be carried out at a high temperature, the high temperature will melt the structural adhesive and also result in poor connection between the box body and the heat exchanger.

[0006] Solution 2: First, the surface of the heat exchanger is subjected to insulation spraying, the expansion beam and the box body main body of the box body are pre-completed electrophoresis, the contact area between the box body and the battery cell is pre-completed insulation spraying, and after applying glue to the interface between the heat exchanger and the box body, the heat exchanger is adhered to the box body, and then the expansion beam is welded at this time.

[0007] However, in this solution, since both the expansion beam and the box body bottom plate are attached with electrophoresis paint, the expansion beam and the box body cannot be welded, affecting the connection reliability between the expansion beam and the box body. Utility Model Content

[0008] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device including this battery device. The thermal management component of the battery device can be installed prior to the first expansion beam, which can reduce the mutual influence between the installation of the first expansion beam and the installation of the thermal management component, and the installation efficiency is higher. At the same time, the first expansion beam and the installation beam can be respectively subjected to the surface treatments required for each of them, which can improve the flexibility of the surface treatment, save the treatment cost, and improve the production efficiency.

[0009] In a first aspect, an embodiment of the present application provides a battery device, including: a main case that defines a receiving cavity; battery cells disposed in the receiving cavity; an installation beam installed on the bottom wall of the main case and jointly forming an avoidance channel with the bottom wall; a first expansion beam detachably installed on the installation beam and cooperating with the battery cells; a thermal management component disposed in the receiving cavity and in heat exchange cooperation with the battery cells, the thermal management component having an inlet portion and an outlet portion, and at least one of the inlet portion and the outlet portion penetrates through the avoidance channel.

[0010] In the above technical solution, on the one hand, the battery device is provided with an installation beam, the first expansion beam is installed on the main case through the installation beam, and the inlet portion and the outlet portion of the thermal management component pass through the avoidance channel formed by the installation beam, which enables the thermal management component to be installed prior to the first expansion beam, reduces the mutual influence between the installation of the first expansion beam and the installation of the thermal management component, and the installation efficiency is higher; on the other hand, since the first expansion beam and the installation beam are detachably coupled, the first expansion beam and the installation beam can be respectively subjected to the surface treatments required for each of them. For example, the first expansion beam can be subjected to anti-corrosion treatment, and the installation beam can be subjected to insulation treatment, etc., which can improve the flexibility of the surface treatment, save the treatment cost, and improve the production efficiency.

[0011] In some embodiments, the first expansion beam includes a plurality of plate bodies, all of the plurality of plate bodies are sheet metal parts, and the plurality of plate bodies are welded together to form the first expansion beam.

[0012] In the above technical solution, since the plurality of plate bodies are welded to each other to form an integral first expansion beam, the structure of the first expansion beam can be simplified, which is convenient for the processing and forming of the first expansion beam and reduces the cost; at the same time, the plate body is provided as a sheet metal part, which can improve the structural strength of the plate body and the structural strength of the first expansion beam.

[0013] In some embodiments, the plurality of plate bodies include: a first plate and a second plate, the first plate and the second plate extend along a first direction and are arranged in a second direction, and in a third direction, both ends of the first plate are respectively connected to both ends of the second plate and cooperate to define a cavity of the first expansion beam, and the third direction, the first direction, and the second direction intersect pairwise.

[0014] In the above technical solution, since the multiple first plates include the first plate and the second plate, and the first plate is connected to the second plate and defines the cavity of the first expansion beam, the composition structure of the first expansion beam can be simplified, the processing is convenient, and the cost is reduced.

[0015] In some embodiments, in the third direction, the two ends of the first plate have a first flange and a second flange extending toward the second plate, and the two ends of the second plate have a third flange and a fourth flange extending toward the first plate, the first flange is overlapped and connected to the third flange, and the second flange is overlapped and connected to the fourth flange.

[0016] In the above technical solution, since the first flange and the second flange of the first plate are respectively overlapped and connected with the third flange and the fourth flange of the second plate, the structure is simple, which can facilitate the welding connection between the first plate and the second plate, improve the structural strength of the welding position, and improve the structural strength of the first expansion beam.

[0017] In some embodiments, the second plate includes: a main board and a support plate that are separately arranged, the main board is arranged on the side of the support plate that is away from the bottom wall in the third direction, the main board is provided with a first folded edge extending away from the second plate along the second direction, the support plate is provided with a second folded edge extending away from the second plate along the second direction, the first folded edge and the second folded edge are stacked and connected.

[0018] In the above technical solution, by making the second plate include a separately arranged main plate and a support plate, the production difficulty of the second plate can be reduced and the processing efficiency can be improved; at the same time, by making the main plate and the support plate connected by lap welding through the first folded edge and the second folded edge respectively, the structural strength of the second plate can be improved, and the welding connection of the main plate and the support plate is facilitated.

[0019] In some embodiments, the first fold is formed with a plurality of first fixing holes penetrating the first fold along the third direction, the plurality of first fixing holes are arranged at intervals along the first direction, and the first expansion beam is connected to the mounting beam through the first fixing holes by fasteners.

[0020] In the above technical solution, the first folded edge is provided with a plurality of first fixing holes for fastening to the mounting beam, thereby facilitating the first expansion beam and the mounting beam to be connected via fasteners, and the plurality of first fixing holes can improve the reliability of the connection between the first expansion beam and the mounting beam and the uniformity of force.

[0021] In some embodiments, the first hem includes a plurality of connecting portions and a plurality of concave portions. The plurality of concave portions and the plurality of connecting portions are alternately arranged and connected along a first direction. The concave portions are recessed from the first hem toward the support plate, and at least one first fixing hole is formed in each concave portion. The second hem includes a plurality of first lugs extending away from the first plate along a second direction. The plurality of first lugs are arranged at intervals along the first direction, and an avoidance notch is defined between two adjacent first lugs. Among them, the concave portions are located within the avoidance notches, and the plurality of connecting portions and the plurality of first lugs correspond to each other one by one and are connected.

[0022] In the above technical solution, since a plurality of concave portions are formed on the first hem, the plurality of concave portions can improve the structural strength of the first hem and the reliability when the first hem is connected to the main box. At the same time, the plurality of concave portions and the plurality of connecting portions can cooperate to define a plurality of recessed grooves for accommodating the first lugs. Thus, the first lugs can be flush with the lower surface of the concave portions, or the concave portions can protrude from the lower surface of the first lugs, so that the concave portions can abut against the connected components when connected to the mounting beam, improving the reliability of the fastening connection.

[0023] In some embodiments, on one side edge of the support plate facing away from the main board in a third direction, an avoidance groove recessed toward the main board is formed, and the avoidance groove is used to avoid the inlet portion and the outlet portion.

[0024] In the above technical solution, by providing the avoidance groove on the support plate for avoiding the inlet portion and the outlet portion of the heat exchange tube, the mutual interference between the support plate and the inlet portion and the outlet portion can be reduced, making the layout more compact and reasonable.

[0025] In some embodiments, the plurality of plate bodies further include: a reinforcing plate. The reinforcing plate extends along the first direction, and the reinforcing plate is disposed between the first plate and the second plate and is connected to the first plate and the second plate.

[0026] In the above technical solution, since the reinforcing plate is provided between the first plate and the second plate, the reinforcing plate can strengthen the overall structural strength of the first expansion beam and improve the anti-expansion effect on the battery cell.

[0027] In some embodiments, the reinforcing plate includes: a flat plate portion and a bent portion. The flat plate portion is attached to and connected to the surface of the first plate, and the bent portion is connected to the flat plate portion and is formed into a U-shaped structure extending along the first direction and opening toward the first plate in the second direction.

[0028] In the above technical solution, by making the reinforcing plate include the flat plate portion connected to the first plate and the bent portion protruding and bent toward the second plate, it is not only convenient to weld the reinforcing plate to the first plate and the second plate, but also can improve the structural strength of the reinforcing plate and enhance the overall strength of the first expansion beam.

[0029] In some embodiments, there are multiple bending portions, the multiple bending portions are arranged at intervals along the first direction, and the flat plate portion is connected between two adjacent bending portions and connected to both sides of the multiple bending portions in the first direction.

[0030] In the above technical solution, by setting a plurality of bending portions on the reinforcing plate, the structural strength of the reinforcing plate can be further enhanced, the structural strength of the first expansion beam can be enhanced, and the uniformity of the structural reinforcement of the first plate and the second plate by the reinforcing plate in the height direction of the first expansion beam can be improved, thereby reducing the weak strength area of the first expansion beam.

[0031] In some embodiments, the reinforcing plate also includes: a third folded edge, the third folded edge is connected to the flat plate portion, the third folded edge has a plurality of second protrusions extending away from the first plate along the second direction, the plurality of second protrusions are arranged at intervals along the first direction, the plurality of second protrusions are clamped between the first folded edge and the second folded edge, and are welded to the first folded edge and the second folded edge.

[0032] In the above technical solution, since the reinforcing plate is also provided with a third folded edge, and the third folded edge is connected between the first folded edge and the second folded edge, the third folded edge can enhance the connection strength at the connection position between the first folded edge and the second folded edge, and improve the reliability of the fastening connection between the first folded edge and the main box. At the same time, a plurality of second lugs arranged at intervals can define an avoidance hole for avoiding the recessed portion of the first folded edge, thereby reducing the probability of interference between the third folded edge and the fastener passing through the first fixing hole.

[0033] In some embodiments, the battery device also includes: a first connecting plate, which is fixed to the side wall of the main box by fasteners, and the first plate has first connecting holes at both ends in the first direction that pass through the first plate along the second direction, and the first plate is fastened to the first connecting plate by fasteners passing through the first connecting holes; a second connecting plate, which is fixed to the side wall of the main box by fasteners, and the second plate has second connecting holes at both ends in the first direction that pass through the second plate along the second direction, and the second plate is fastened to the second connecting plate by fasteners passing through the second connecting holes.

[0034] In the above technical solution, since the battery device also includes a first connecting plate and a second connecting plate, and the first expansion beam is fixed to the inner wall of the main box on both sides in the thickness direction by the first connecting plate and the second connecting plate respectively, it is not only convenient to realize the fastening connection between the first expansion beam and the main box, but also can improve the connection reliability between the first expansion beam and the main box.

[0035] In some embodiments, the mounting beam extends along the first direction and is arranged on a side of the first expansion beam away from the battery cell in the second direction, and the first expansion beam is connected to the mounting beam by fasteners and / or adhesive connection, and the first direction intersects the second direction.

[0036] In the above technical solution, since the first expansion beam and the mounting beam are connected by fasteners and / or adhesively bonded through an adhesive layer, it is not only convenient for the assembly between the first expansion beam and the mounting beam, improving the assembly efficiency, but also convenient for the first expansion beam and the mounting beam to perform the respective surface pretreatment required, so as to improve the corrosion resistance and insulation performance of the first expansion beam and the mounting beam, thereby improving the flexibility of surface treatment, saving the treatment cost, and improving the production efficiency. In addition, the first expansion beam and the mounting beam are fixedly connected through fasteners and an adhesive layer, which can further improve the connection reliability and stability between the first expansion beam and the mounting beam.

[0037] In some embodiments, the first expansion beam has a first flange extending towards the mounting beam, the first flange is supported on the top of the mounting beam, and the first flange and the mounting beam are connected by fasteners.

[0038] In the above technical solution, since the mounting beam is arranged on one side in the thickness direction of the first expansion beam, and the first expansion beam is fixedly connected to the top of the mounting beam through the first flange, thus, the first flange can play a positioning role, facilitating the fixing of the first expansion beam on the mounting beam and improving the assembly efficiency.

[0039] In some embodiments, the mounting beam includes two first beams, both of the two first beams extend along the first direction and are arranged at intervals in the first direction, both of the two first beams are fixed to the bottom wall, and an avoidance channel is formed between the two first beams.

[0040] In the above technical solution, since the mounting beam includes two first beams arranged at intervals, and the avoidance channel is formed between the two first beams, it is thus convenient to form the avoidance channel, facilitating the inlet part and the outlet part of the heat exchange tube to pass through the mounting beam and be connected to the current collector, simplifying the structure and reducing the forming difficulty of the avoidance channel.

[0041] In some embodiments, the first beam includes a beam body, a first support edge and a second support edge. The beam body extends along the first direction and has a U-shaped cross-section. The first support edge and the second support edge are respectively connected to the two side edges of the opening of the beam body and extend away from each other. Both the first support edge and the second support edge are connected to the bottom wall. The first support edge is located on the side of the beam body facing the first expansion beam, and the bottom surface of the first expansion beam in the third direction is supported on the first support edge.

[0042] In the above technical solution, by making the first beam include a U-shaped beam body and the first support edge and the second support edge connected to the two side edges of the opening of the beam body, the structural strength of the first beam can be improved, and the support stability between the first beam and the bottom wall of the accommodating cavity can also be increased, facilitating the first beam to be fixedly connected to the main box through the first support edge and / or the second support edge.

[0043] In some embodiments, the first support edge and the bottom surface of the first expansion beam are adhesively connected through an adhesive layer, and / or the side surface of the beam body facing the first support edge in the second direction is adhesively connected to the first expansion beam through an adhesive layer.

[0044] In the above technical solution, by providing an adhesive layer on the surface of the first support edge and / or the side surface of the beam body, the adhesive connection between the first expansion beam and the first beam of the mounting beam can be achieved, and further the adhesive connection between the first expansion beam and the mounting beam can be realized, which can further improve the connection reliability between the first expansion beam and the mounting beam, reduce the assembly difficulty, and improve the assembly efficiency.

[0045] In some embodiments, the mounting beam further includes: a connecting beam, the connecting beam extends along the first direction and is connected between the two first beams, the connecting beam is spaced apart from the inner wall of the accommodating cavity, and the connecting beam, the two first beams and the bottom wall enclose an avoidance channel.

[0046] In the above technical solution, since the mounting beam further includes a connecting beam, and the connecting beam is connected between the two mounting beams, in this way, the mounting beam can be a continuous beam structure in the first direction, and the first expansion beam can be continuously supported in the first direction. Therefore, the support stability of the mounting beam for the first expansion beam can be improved, and in addition, it is also convenient to define an avoidance channel.

[0047] In some embodiments, the mounting beam further includes a bracket, the bracket is fixed to the bottom wall and is arranged between the two first beams, and the connecting beam is supported on the bracket.

[0048] In the above technical solution, by providing a bracket between the two first beams to support the connecting beam, the support effect on the connecting beam can be improved, the structural strength of the connecting beam can be enhanced, and further the structural strength of the first expansion beam can be enhanced.

[0049] In some embodiments, the bracket includes: a support plate and a plurality of support legs, the plurality of support legs are arranged circumferentially along the support plate, the support legs include a support section and an extension section arranged in an L shape, the support section is connected to the bottom wall, the extension section extends away from the support section along the third direction, the support plate is connected to one end of the extension sections of the plurality of support legs away from the support section, and the connecting beam is supported on the support plate and fixed to the support plate through a fastener.

[0050] In the above technical solution, since the bracket includes a support plate and a plurality of support legs for supporting the support plate, the structure of the bracket can be simplified, the support stability of the bracket for the connecting beam can be improved, and it is convenient to fixedly connect the connecting beam to the bracket.

[0051] In some embodiments, the battery device further includes: a second expansion beam, the second expansion beam extends along the first direction and is arranged at an interval from the first expansion beam in the second direction, the battery cells are arranged between the first expansion beam and the second expansion beam, and the structure of the second expansion beam is the same as or different from the structure of the first expansion beam.

[0052] In the above technical solution, since the battery device further includes a second expansion beam, the second expansion beam can cooperate with the first expansion beam to jointly suppress the expansion of the battery cell in the second direction.

[0053] In some embodiments, the thermal management member includes a heat exchange tube. An installation groove is formed on the bottom wall. The heat exchange tube is disposed in the installation groove and extends along the extending direction of the installation groove.

[0054] In the above technical solution, since the installation groove is formed on the bottom wall of the main box and the heat exchange tube is disposed in the installation groove, it is convenient to arrange the heat exchange tube, reduce the space occupied by the heat exchange tube in the accommodation cavity, make the structure compact, and improve the energy density of the battery device.

[0055] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device according to the first aspect of the present application.

[0056] In the above embodiment, by providing the battery device of the first aspect, and since the battery device is provided with an installation beam, the first expansion beam is installed on the main box through the installation beam, and the inlet part and the outlet part of the thermal management member pass through the avoidance channel formed by the installation beam. This enables the thermal management member to be installed prior to the first expansion beam, which can reduce the mutual influence between the installation of the expansion beam and the installation of the thermal management member, and improve the installation efficiency; on the other hand, since the first expansion beam and the installation beam are detachably engaged, the first expansion beam and the installation beam can be respectively subjected to the required surface treatments. For example, the first expansion beam can be subjected to anti-corrosion treatment, and the installation beam can be subjected to insulation treatment, etc., which can improve the flexibility of surface treatment, save treatment costs, and improve production efficiency.

[0057] The additional aspects and advantages of the present application will be partly given in the following description, partly will become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0058] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0059] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0060] Figure 3 is a schematic diagram of the battery device according to an embodiment of the present application without battery cells;

[0061] Figure 4 is Figure 3 a schematic diagram of another angle of the battery device shown in

[0062] Figure 5 is Figure 3Schematic diagram of the first expansion beam shown in

[0063] Figure 6 is Figure 3 Exploded view of the first expansion beam shown in

[0064] Figure 7 is Figure 3 Partial enlarged view of the battery device shown in

[0065] Figure 8 is Figure 4 Partial enlarged view of the battery device shown in

[0066] Figure 9 Schematic diagram of the main box, mounting beam and second expansion beam of the battery device according to an embodiment of the present application;

[0067] Figure 10 is Figure 9 Schematic diagram of the battery device shown in excluding the connecting beam;

[0068] Figure 11 is Figure 10 Enlarged view of the circled position C in

[0069] Reference numerals:

[0070] 1A, electrical device;

[0071] 1000, battery device; 2000, controller; 3000, motor;

[0072] 100, first expansion beam;

[0073] 10, first plate; 11, first flanging; 12, second flanging; 13, first connecting hole;

[0074] 20, second plate; 213, second connecting hole;

[0075] 21, main board; 211, third flanging; 212, first folding edge; 2121, first fixing hole; 2122, recess; 2123, connecting portion;

[0076] 22, support plate; 221, fourth flanging;

[0077] 222, second folding edge; 2221, first lug; 2222, avoidance notch; 223, avoidance groove;

[0078] 30, reinforcement plate; 31, flat plate portion; 32, bending portion; 33, third flanging; 331, second lug;

[0079] 200, main box; 201, accommodation cavity; 202, bottom wall; 203, avoidance channel; 204, mounting groove;

[0080] 300, Battery cell;

[0081] 400, Thermal management component; 410, Heat exchange tube; 411, Inlet part; 412, Outlet part; 420, Current collector;

[0082] 510, First connecting plate; 520, Second connecting plate;

[0083] 600, Installation beam; 610, First beam; 611, Beam body; 612, First support edge; 613, Second support edge;

[0084] 620, Connecting beam; 630, Bracket; 631, Support plate; 632, Support leg; 6321, Support section; 6322, Extension section;

[0085] 700, Second expansion beam; 800, Adhesive layer; X, First direction; Y, Second direction; Z, Third direction. Detailed implementation manners

[0086] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0088] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality" means more than two unless otherwise specifically defined.

[0089] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0090] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0091] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0092] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0093] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0094] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0095] In a battery, a plurality of battery cells are arranged in a box. When the battery cells are operating, the battery cells will expand internally. To limit the position of the battery cells and reduce the expansion amount of the battery cells, expansion beams are provided at both ends of the box in the direction where the plurality of battery cells are stacked. The two expansion beams are respectively abutted against both sides of the plurality of battery cells to fix the positions of the plurality of battery cells and improve the stability of the battery cells.

[0096] Meanwhile, in the battery, in order to enable the battery cells to operate under suitable temperature conditions, a thermal management component is provided inside the box body. The thermal management component includes a heat exchange component and a current collector. When the thermal management component is directly built into the box body, the heat exchange component and the current collector are usually arranged on both sides of the expansion beam. For example, when the heat exchange component is arranged between the bottom wall of the box body and the battery cell, the current collector is located on the side of the expansion beam away from the battery cell.

[0097] Among them, during battery assembly, glue needs to be applied above the heat exchange tube to contact the bottom of the battery cell. During the glue application process, due to bubbles or insufficient glue application area, etc., the bottom of the battery cell may directly contact the heat exchange component, thereby causing the insulation withstand voltage of the battery system to fail. Therefore, it is necessary to perform insulation spraying on the contact area between the box body and the cold plate and the module. In addition, for a sheet metal box body, in order to ensure that it does not rust during long-term use, it is also necessary to perform surface electrophoresis treatment on the entire box body.

[0098] For the solution of a heat exchange component with a U-shaped heat exchange tube built into a sheet metal box body, structural glue needs to be applied to the contact interface between the bottom of the heat exchange component and the box body to ensure good fitting between the heat exchange component and the box body without deformation or warping. The inlet and outlet of the U-shaped heat exchange tube need to be arranged outside the expansion beam, and the expansion beam on the side of the inlet and outlet of the heat exchange tube needs to avoid the inlet and outlet of the U-shaped heat exchange tube. Therefore, during assembly, the heat exchange component must be installed on the bottom plate of the box body first and then the expansion beam is welded.

[0099] In the related art, the box body is manufactured in the following manner.

[0100] Solution 1: Neither the heat exchange component nor the surface of the box body is treated. After applying glue to the interface between the heat exchange component and the box body, the heat exchange component is adhered to the box body, the expansion beam is welded, and then the entire box body is placed in the electrophoresis tank for electrophoresis. After electrophoresis is completed, insulation spraying is performed on the contact area between the box body and the module.

[0101] However, in this solution: The electrophoresis liquid cannot penetrate into the contact interface between the box body and the heat exchange component, and there is a long-term corrosion risk; after applying glue to the interface between the heat exchange component and the box body and then performing electrophoresis, the electrophoresis liquid will wash away the glue, resulting in weak adhesion between the heat exchange component and the box body; after electrophoresis is completed and then insulation spraying is performed, since insulation spraying must be carried out at high temperature, the high temperature will melt the structural glue and also cause weak connection between the box body and the heat exchange component.

[0102] Solution 2: First, perform insulation spraying on the surface of the heat exchange component. The expansion beam and the main body of the box body of the box body are pre-completed electrophoresis, and the contact area between the box body and the battery cell is pre-completed insulation spraying. After applying glue to the interface between the heat exchange component and the box body, the heat exchange component is adhered to the box body, and then the expansion beam is welded at this time.

[0103] However, in this solution, since both the expansion beam and the bottom plate of the box body are attached with electrophoresis paint, the expansion beam and the box body cannot be welded, affecting the connection reliability between the expansion beam and the box body.

[0104] Based on the above considerations, in order to achieve a reliable connection between the expansion beam and the main box while completing the surface treatment of the expansion beam and the main box, the present application designs a battery device. An installation beam is arranged in the main box, and an avoidance channel is formed between the installation beam and the bottom wall of the main box. The inlet part and the outlet part of the thermal management component pass through the avoidance channel. The first expansion beam is detachably installed on the installation beam. When assembling the battery device, the main box, the first expansion beam and / or the installation beam can be pre-completed electrophoresis and / or insulation spraying first, then the thermal management component is embedded on the bottom wall of the main box, then the installation beam is installed, and finally the first expansion beam is fixed on the installation beam. Thus, on the one hand, the battery device is provided with an installation beam, the first expansion beam is installed on the main box through the installation beam, and the inlet part and the outlet part of the thermal management component pass through the avoidance channel formed by the installation beam, which enables the thermal management component to be installed prior to the first expansion beam, can reduce the mutual influence between the installation of the expansion beam and the installation of the thermal management component, and improve the installation efficiency; on the other hand, since the first expansion beam and the installation beam are detachably matched, the first expansion beam and the installation beam can be respectively subjected to the surface treatment required by each of them. For example, the first expansion beam can be subjected to anti-corrosion treatment, and the installation beam can be subjected to insulation treatment, etc., which can improve the flexibility of surface treatment, save treatment costs, and improve production efficiency.

[0105] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0106] In some embodiments, the battery cell assembly is usually formed by arranging multiple battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0107] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0108] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0109] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0110] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are buckled so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0111] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0112] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0113] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body with a door provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0114] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles and spaceships, etc.

[0115] For the convenience of description in the following embodiments, taking the electrical device 1A as a vehicle as an example, the structures of the electrical device 1A and the battery device of the present application are introduced in detail.

[0116] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the electrical device 1A as a vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 1000, and the battery device 1000 can be arranged at the bottom, the head or the tail of the vehicle. The battery 1000 device can be used for power supply of the vehicle. For example, the battery 1000 device can be used as the operating power source of the vehicle. The vehicle may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle. In some embodiments of the present application, the battery device 1000 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0117] Next, refer to Figures 2 - 8 to describe the battery device 1000 according to the embodiment of the first aspect of the present application. Please refer toFigure 2 , Figure 2 is a schematic structural diagram of a battery device 1000 provided for some embodiments of the present application. Figure 3 is a schematic diagram of the battery device 1000 according to an embodiment of the present application without battery cells 300; Figure 4 is Figure 3 a schematic diagram of another angle of the battery device 1000 shown in Figure 5 is Figure 3 a schematic diagram of the first expansion beam 100 shown in Figure 6 is Figure 5 an exploded view of the first expansion beam 100 shown in Figure 7 is a partial enlarged view of the battery device 1000 according to an embodiment of the present application; Figure 8 is Figure 4 a partial enlarged view of the battery device 1000 shown in Figure 9 is a schematic diagram of the main box 200, the mounting beam 600, and the second expansion beam 700 of the battery device 1000 according to an embodiment of the present application; Figure 10 is Figure 9 a schematic diagram of the battery device 1000 shown in without the connecting beam 620; Figure 11 is Figure 10 an enlarged view of the circled C in

[0118] Wherein, for convenience of description, the length direction of the first expansion beam 100 (the width direction of the main box 200) is set as the first direction X, the thickness direction of the first expansion beam 100 (the length direction of the main box 200) is set as the second direction Y, and the height direction of the first expansion beam 100 (the height direction of the main box 200) is set as the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. In a specific example, the first direction X is the left-right direction, the second direction Y is the front-back direction, and the third direction Z is the up-down direction.

[0119] An embodiment of the present application provides a battery device 1000. The battery device 1000 includes: a main box 200, battery cells 300, a thermal management member 400, a mounting beam 600, and a first expansion beam 100.

[0120] As Figure 3 and Figure 4As shown, the main box 200 defines a receiving cavity 201; the battery cells 300 are disposed in the receiving cavity 201, the mounting beam 600 is mounted on the bottom wall 202 of the main box 200, and together with the bottom wall 202 forms an avoidance channel 203. The first expansion beam 100 is detachably mounted on the mounting beam 600 and cooperates with the battery cells 300. The thermal management member 400 is disposed in the receiving cavity 201, and the thermal management member 400 is in heat exchange cooperation with the battery cells 300. The thermal management member 400 has an inlet portion 411 and an outlet portion 412, and at least one of the inlet portion 411 and the outlet portion 412 penetrates through the avoidance channel 203.

[0121] For example, the main box 200 can be a hollow structure that is open on one side in the third direction Z. The inner space of the main box 200 is the receiving cavity 201, and the receiving cavity 201 can be used to arrange a plurality of battery cells 300, thermal management members 400, and other electrical components for the battery device 1000. In some examples, before assembling the battery device 1000, the main box 200 can be pre-electrophoresed to form an electrophoretic coating on the surface of the main box 200, which can improve the corrosion resistance of the main box 200.

[0122] The number of battery cells 300 can be multiple. The multiple battery cells 300 can form a plurality of battery cell assemblies. The plurality of battery cell assemblies are arranged in sequence along the first direction. Each battery cell assembly can include a plurality of battery cells 300 stacked in the second direction. The first expansion beam 100 and the mounting beam 600 can be arranged on one side of the plurality of battery cells 300 in the second direction.

[0123] The mounting beam 600 is disposed in the receiving cavity 201. The mounting beam 600 extends along the first direction X. The mounting beam 600 is fixed to the bottom wall 202 and cooperates with the bottom wall 202 to define the avoidance channel 203.

[0124] Among them, the mounting beam 600 is fixed to the bottom wall 202. For example, the mounting beam 600 can be connected to the bottom wall 202 of the receiving cavity 201 through fasteners. The two ends of the mounting beam 600 in the first direction X can be fixedly connected to the side walls of the receiving cavity 201. For example, the two ends of the mounting beam 600 in the first direction X can be connected to the side walls of the receiving cavity 201 through fasteners or can be welded.

[0125] The first expansion beam 100 extends along the first direction. The first expansion beam 100 is detachably mounted on the mounting beam 600. For example, the first expansion beam 100 can be connected to the mounting beam 600 by fasteners, or can be snap-connected and / or adhesively connected to the mounting beam 600. In this way, the first expansion beam 100 is fixed and supported on the mounting beam 600. On the one hand, it can be more convenient for the first expansion beam 100 to be connected to the main case 200, making the installation of the first expansion beam 100 convenient and improving the installation efficiency. On the other hand, the mounting beam 600 can enhance the structural strength of the first expansion beam 100 and enhance the anti-expansion effect on the battery cells 300.

[0126] Since the first expansion beam 100 is detachably connected to the mounting beam 600, at least one of the first expansion beam 100 and the mounting beam 600 can be pre-treated separately. For example, at least one of the first expansion beam 100 and the mounting beam 600 can be electrophoretically treated and / or insulated sprayed. Among them, the surface treatment of the first expansion beam 100 and / or the mounting beam 600 can be electrophoretic and / or insulated spraying on a part of the surface of the first expansion beam 100 and the mounting beam 600, or can be electrophoretic and / or insulated spraying on the entire surface of the first expansion beam 100 and / or the mounting beam 600. Thereby, the corrosion resistance and insulation performance of the first expansion beam 100 and / or the mounting beam 600 can be improved.

[0127] In one example, the first expansion beam 100 and the mounting beam 600 can be respectively subjected to the required surface treatments. For example, the first expansion beam 100 is subjected to anti-corrosion treatment (such as electrophoresis), and the mounting beam 600 is subjected to insulation treatment (such as insulation spraying), etc. Thereby, the flexibility of surface treatment of the first expansion beam 100 and the mounting beam 600 can be improved, the treatment cost of the first expansion beam 100 and the mounting beam 600 can be saved, and the production efficiency can be improved.

[0128] The thermal management component 400 is arranged in the accommodation cavity 201. For example, the thermal management component 400 is arranged at the position of the bottom wall 202. The thermal management component 400 includes one or more heat exchange tubes 410. The heat exchange tubes 410 can be flat tubes. When the battery cells 300 are arranged in the accommodation cavity 201, the thermal management component 400 can be used for heat exchange cooperation with the battery cells 300 to enable the battery cells 300 to operate within a suitable temperature range. When the battery device 1000 is working, the external heat exchange fluid can enter the heat exchange tubes 410 from the inlet part 411, complete heat exchange with the battery cells 300, and then flow out from the outlet part 412.

[0129] Among them, at least one of the inlet part 411 and the outlet part 412 penetrates through the avoidance channel 203. That is to say, only the inlet part 411 can penetrate through the avoidance channel 203, only the outlet part 412 can penetrate through the avoidance channel 203, or both the inlet part 411 and the outlet part 412 can penetrate through the avoidance channel 203, so as to facilitate the connection between the inlet part 411 and the outlet part 412 of the heat management part 400 and the external pipeline. In addition, the inlet part 411 and the outlet part 412 can penetrate through the same avoidance channel 203, or the inlet part 411 and the outlet part 412 can penetrate through different avoidance channels 203 respectively.

[0130] The heat management part 400 may further include a current collector 420. The current collector 420 and the heat exchange tube 410 are respectively arranged on both sides of the first expansion beam 100 in the second direction. To connect the inlet part 411 and the outlet part 412 of the heat exchange tube 410 to the current collector 420, in this embodiment, the first expansion beam 100 is arranged on the mounting beam 600. In this way, the mounting beam 600 can lift the first expansion beam 100, so that the first expansion beam 100 is spaced apart from the bottom wall 202 of the main box 200. At the same time, an avoidance channel 203 is defined by the cooperation between the mounting beam 600 and the bottom wall 202 of the main box 200. The avoidance channel 203 communicates the spaces on both sides of the mounting beam 600 in the second direction Y. The inlet part 411 and the outlet part 412 of the heat exchange tube 410 can pass through the avoidance channel 203 from one side of the mounting beam 600 and extend to the other side of the mounting beam 600 to be connected to the current collector 420 located on the other side of the mounting beam 600.

[0131] During the assembly process of the battery device 1000, the surface treatment (such as insulation spraying and electrophoresis) of the main box 200, the first expansion beam 100 and / or the mounting beam 600 can be completed first. Then, at least part of the mounting beam 600 can be installed on the main box 200 first, so that the main box 200 and the mounting beam 600 cooperate to define the avoidance channel 203. Then, the heat management part 400 is arranged in the main box 200, and the inlet part 411 and the outlet part 412 of the heat management part 400 are passed out from the position of the avoidance channel 203. Then, the first expansion beam 100 is installed on the mounting beam 600. In this way, during the assembly of the battery device 1000 in this embodiment, the heat management part 400 can be installed in the main box 200 prior to the first expansion beam 100, so as to reduce the mutual influence between the installation of the first expansion beam 100 and the installation of the heat management part 400 and improve the installation efficiency.

[0132] In another example, when the battery device 100 is assembled, after the surface treatment of the main box 200, the first expansion beam 100, and / or the mounting beam 600 is completed, the thermal management component 400 can also be first installed into the main box 200, so that the inlet portion 411 and the outlet portion 412 of the thermal management component 400 are located at the position of the avoidance channel 203 of the preset mounting beam 600, and then the mounting beam 600 is installed, and finally the first expansion beam 100 is installed. Thus, the thermal management component 400 can be preferably installed in the main box 200 prior to the mounting beam 600 and the first expansion beam 100, thereby reducing the influence of the installation of the first expansion beam 100 on the installation of the thermal management component 400 and improving the installation efficiency.

[0133] In the above technical solution, on the one hand, the battery device 1000 is provided with a mounting beam 600, the first expansion beam 100 is installed on the main box 200 through the mounting beam 600, and the inlet portion 411 and the outlet portion 412 of the thermal management component 400 pass through the avoidance channel 203 formed by the mounting beam 600, which enables the thermal management component 400 to be installed prior to the first expansion beam 100, reduces the mutual influence between the installation of the first expansion beam 100 and the installation of the thermal management component 400, and has a higher installation efficiency; on the other hand, since the first expansion beam 100 and the mounting beam 600 are detachably engaged, the first expansion beam 100 and the mounting beam 600 can respectively perform the surface treatments required for each of them. For example, the first expansion beam 100 can be subjected to anti-corrosion treatment, and the mounting beam 600 can be subjected to insulation treatment, etc., which can improve the flexibility of the surface treatment, save the treatment cost, and improve the production efficiency.

[0134] In some embodiments of the present application, the first expansion beam 100 includes a plurality of plate bodies (such as the first plate 10, the second plate 20, and the reinforcing plate 30 described below), the plurality of plate bodies are all sheet metal parts, and the plurality of plate bodies are welded together to form the first expansion beam 100.

[0135] For example Figure 5 and Figure 6 As shown, the first expansion beam 100 may include two, three, four, five, six or more plate bodies. The plate body is a sheet metal part, that is, the plate body is a metal plate. For example, the plate body can be a steel plate. Further, the plate body can be a steel plate with a yield strength greater than or equal to 340 MPa and a tensile strength greater than or equal to 590 MPa.

[0136] When manufacturing the first expansion beam 100, a plurality of plate bodies of the first expansion beam 100 can be first processed from a sheet metal base material, then the plurality of plate bodies are welded together, and finally, the welded first expansion beam 100 is placed in an electrophoresis bath for electrophoresis.

[0137] In the above technical solution, since multiple plate bodies are welded to each other to form an integral first expansion beam 100, the structure of the first expansion beam 100 can be simplified, facilitating the processing and forming of the first expansion beam 100 and reducing costs. At the same time, the plate bodies are set as sheet metal parts, which can improve the structural strength of the plate bodies and the structural strength of the first expansion beam 100.

[0138] In some embodiments of the present application, the multiple plate bodies include: a first plate 10 and a second plate 20. The first plate 10 and the second plate 20 extend along a first direction X and are arranged in a second direction Y. In a third direction Z, the two ends of the first plate 10 are respectively connected to the two ends of the second plate 20, and cooperate to define a cavity of the first expansion beam 100. The third direction Z intersects the first direction X and the second direction Y pairwise.

[0139] Specifically, as Figure 5 and Figure 6 shown, the first plate 10 and the second plate 20 are plate-shaped and extend along the length direction and the height direction of the first expansion beam 100. The first plate 10 and the second plate 20 are arranged in the thickness direction of the first expansion beam 100. The two ends of the first plate 10 in the height direction of the first expansion beam 100 are respectively connected to the two ends of the second plate 20 in the height direction of the first expansion beam 100, and form the first expansion beam 100 with a cavity, that is, the first expansion beam 100 is a hollow beam. Thus, compared with the expansion beam formed by extrusion molding, the structure of the first expansion beam 100 in this embodiment is simpler, more convenient to process, and has a lower cost.

[0140] It should be noted that the pairwise intersection of the third direction Z with the first direction X and the second direction Y means that: the first direction X and the second direction Y are arranged at an angle, and the angle between the first direction X and the second direction Y is greater than 0° and less than 180°. For example, the first direction X and the second direction Y can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°. The third direction Z is arranged at an angle with the first direction X, and the angle between the third direction Z and the first direction X is greater than 0° and less than 180°. For example, the third direction Z and the first direction X can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°. The third direction Z is arranged at an angle with the second direction Y, and the angle between the third direction Z and the second direction Y is greater than 0° and less than 180°. For example, the third direction Z and the second direction Y can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°.

[0141] In the above technical solution, since the multiple first plate bodies include the first plate 10 and the second plate 20, and the first plate 10 and the second plate 20 are connected to define the cavity of the first expansion beam 100, the composition structure of the first expansion beam 100 can be simplified, facilitating processing and reducing costs.

[0142] In some embodiments of the present application, in the third direction Z, at both ends of the first plate 10, there are a first flanging 11 and a second flanging 12 extending towards the second plate 20, and at both ends of the second plate 20, there are a third flanging 211 and a fourth flanging 221 extending towards the first plate 10. The first flanging 11 is lap-connected to the third flanging 211, and the second flanging 12 is lap-connected to the fourth flanging 221.

[0143] As Figure 5 and Figure 6 shown, at both ends of the first plate 10 in the height direction of the first expansion beam 100, a first flanging 11 and a second flanging 12 are respectively formed. Both the first flanging 11 and the second flanging 12 extend towards the second plate 20 along the thickness direction of the first expansion beam 100. Among them, the first flanging 11 and the second flanging 12 can be respectively formed by bending both ends of the first plate 10 towards the second plate 20. At this time, the cross-section of the first plate 10 perpendicular to the length direction is a U shape opening towards the second plate 20.

[0144] At both ends of the second plate 20 in the height direction of the first expansion beam 100, a third flanging 211 and a fourth flanging 221 are respectively formed. Both the third flanging 211 and the fourth flanging 221 extend towards the first plate 10 along the thickness direction of the first expansion beam 100. Among them, the third flanging 211 and the fourth flanging 221 can be respectively formed by bending both ends of the second plate 20 towards the first plate 10. At this time, the cross-section of the second plate 20 perpendicular to the length direction is a U shape opening towards the first plate 10.

[0145] When the first plate 10 and the second plate 20 are assembled, the first flanging 11 and the third flanging 211 are stacked and welded in the height direction of the first expansion beam 100, and the second flanging 12 and the fourth flanging 221 are stacked and welded in the height direction of the first expansion beam 100. Thus, it is convenient to weld and connect the first plate 10 and the second plate 20, and it is convenient to form the first expansion beam 100 into a beam with a cavity. In addition, the first flanging 11 and the third flanging 211 are lap-welded, and the second flanging 12 and the fourth flanging 221 are lap-welded, which can also improve the connection strength between the first plate 10 and the second plate 20 and enhance the overall strength of the first expansion beam 100.

[0146] In the above technical solution, since the first flanging 11 and the second flanging 12 of the first plate 10 are respectively lap-connected to the third flanging 211 and the fourth flanging 221 of the second plate 20, the structure is simple, it is convenient to weld and connect the first plate 10 and the second plate 20, the structural strength of the welding position can be improved, and the structural strength of the first expansion beam 100 is improved.

[0147] In some embodiments of the present application, the second plate 20 includes: a main board 21 and a support board 22 that are separately arranged. The main board 21 is disposed on a side of the support board 22 facing away from the bottom wall 202 in the third direction Z. The main board 21 is provided with a first folded edge 212 extending away from the second plate 20 in the second direction Y, and the support board 22 is provided with a second folded edge 222 extending away from the second plate 20 in the second direction Y. The first folded edge 212 and the second folded edge 222 are stacked and connected.

[0148] As Figure 5 and Figure 6 shown, the main board 21 and the support board 22 are arranged in the height direction of the first expansion beam 100, and the main board 21 is in a plate shape extending in the length direction and the height direction of the first expansion beam 100. The support board 22 is connected to a side of the main board 21 facing the heat exchange tube 410. Both the main board 21 and the support board 22 are independent components, and the main board 21 and the support board 22 can be connected by welding. The separately arranged main board 21 and support board 22 can reduce the processing difficulty of the second plate 20 and improve production efficiency.

[0149] Further, a first folded edge 212 is provided at an edge of the main board 21 facing the support board 22, and a second folded edge 222 is provided at an edge of the support board 22 facing the main board 21. The first folded edge 212 and the second folded edge 222 are overlapped and connected. For example, the first folded edge 212 and the second folded edge 222 are stacked and welded in the height direction of the first expansion beam 100. Thus, not only can the connection reliability between the main board 21 and the support board 22 be improved, but also the structural strength of the second plate 20 can be enhanced, and the structural strength of the first expansion beam 100 can be promoted.

[0150] Further, both the first folded edge 212 and the second folded edge 222 extend away from the cavity in the thickness direction of the first expansion beam 100. Thus, the first folded edge 212 and the second folded edge 222 can be located outside the cavity, facilitating the welding operation between the first folded edge 212 and the second folded edge 222.

[0151] In addition, a third flanging 211 is formed at an edge of the main board 21 facing away from the support board 22, and a fourth flanging 221 is formed at an edge of the support board 22 facing away from the main board 21.

[0152] In the above technical solution, by making the second plate 20 include the separately arranged main board 21 and support board 22, the production difficulty of the second plate 20 can be reduced and the processing efficiency can be improved; at the same time, by making the main board 21 and the support board 22 be overlapped and welded through the first folded edge 212 and the second folded edge 222 respectively, the structural strength of the second plate 20 can be enhanced, and it is convenient for the main board 21 and the support board 22 to be welded together.

[0153] In some embodiments of the present application, the first hem 212 is formed with a plurality of first fixing holes 2121 penetrating the first hem 212 along the third direction Z. The plurality of first fixing holes 2121 are arranged at intervals along the first direction X. The first expansion beam 100 is connected to the mounting beam 600 through fasteners passing through the first fixing holes 2121.

[0154] As Figure 5 and Figure 6 shown, the first hem 212 extends along the length direction and the thickness direction of the first expansion beam 100. A plurality of first fixing holes 2121 are provided on the first hem 212. For example, two, four, six, eight, ten, twelve, fourteen or more first fixing holes 2121 can be provided on the first hem 212. The plurality of first fixing holes 2121 are arranged at intervals along the length direction of the first expansion beam 100. During assembly, the first expansion beam 100 that is welded into one body and after electrophoresis is placed into the main box 200. Then, a plurality of fasteners respectively pass through the corresponding first fixing holes 2121 and are connected to the mounting beam 600.

[0155] Among them, the fasteners can be bolts or rivet nuts, etc. The first fixing holes 2121 can be circular holes or other polygonal holes.

[0156] In the above technical solution, a plurality of first fixing holes 2121 for tightly connecting with the mounting beam 600 are provided on the first hem 212. Thus, it is convenient for the first expansion beam 100 to be connected to the mounting beam 600 through fasteners, and the plurality of first fixing holes 2121 can improve the reliability of the connection between the first expansion beam 100 and the mounting beam 600 and the uniformity of force bearing.

[0157] In some embodiments of the present application, the first hem 212 includes a plurality of connecting portions 2123 and a plurality of concave portions 2122. The plurality of concave portions 2122 and the plurality of connecting portions 2123 are alternately arranged and connected along the first direction X. The concave portions 2122 are formed by the first hem 212 recessing towards the support plate 22. Each concave portion 2122 is formed with at least one first fixing hole 2121. The second hem 222 includes a plurality of first lugs 2221 extending away from the first plate 10 along the second direction Y. The plurality of first lugs 2221 are arranged at intervals along the first direction X. An avoidance notch 2222 is defined between two adjacent first lugs 2221. Among them, the concave portions 2122 are located in the avoidance notch 2222, and the plurality of connecting portions 2123 and the plurality of first lugs 2221 correspond to each other and are connected.

[0158] As Figure 5 and Figure 6As shown, the first hem 212 may include a plurality of recesses 2122 and a plurality of connecting portions 2123. The plurality of recesses 2122 and the plurality of connecting portions 2123 are alternately arranged in the length direction of the first hem 212, and both ends in the length direction of the first hem 212 are connecting portions 2123. Among them, the recesses 2122 are recessed and formed in the direction towards the support plate 22 relative to the connecting portions 2123. For example, the recesses 2122 may be stamped and formed on the first hem 212 in the direction towards the support plate 22. Among them, two adjacent recesses 2122 and the connecting portion 2123 cooperate to define a recessed groove opening towards the second hem 222, and the recessed groove penetrates both side edges of the first hem 212 in the width direction of the first hem 212.

[0159] At the same time, the first fixing holes 2121 are formed on the recesses 2122 and penetrate the recesses 2122 in the thickness direction of the first hem 212, and at least one first fixing hole 2121 may be formed on each recess 2122. For example, one first fixing hole 2121 may be formed on a part of the plurality of recesses 2122, and two or three first fixing holes 2121 may be formed on another part of the plurality of recesses 2122.

[0160] The second hem 222 is formed with a plurality of first lugs 2221 arranged at intervals. The plurality of first lugs 2221 are formed into rectangular plate shapes extending in the length direction and the width direction of the second hem 222. The plurality of first lugs 2221 correspond to the plurality of connecting portions 2123 one by one and are located in the recessed grooves defined by the corresponding first lugs 2221. An avoidance notch 2222 is defined between two adjacent first lugs 2221. The plurality of recesses 2122 correspond to the plurality of avoidance notches 2222 one by one and extend into the corresponding avoidance notches 2222.

[0161] When the first hem 212 is connected to the second hem 222, the first lugs 2221 of the second hem 222 are fitted into the recessed grooves at the positions of the corresponding connecting portions 2123 and are welded to the corresponding connecting portions 2123. The recesses 2122 correspond to the avoidance notches 2222 one by one and are fitted into the corresponding avoidance notches 2222, so that the first fixing holes 2121 are exposed at the positions of the avoidance notches 2222, thereby facilitating the fasteners passing through the first fixing holes 2121 to pass through the avoidance notches 2222 and be connected to the main box 200.

[0162] In the above technical solution, since a plurality of recesses 2122 are formed on the first hem 212, the plurality of recesses 2122 can improve the structural strength of the first hem 212 and the reliability when the first hem 212 is connected to the main case 200. At the same time, the plurality of recesses 2122 and the plurality of connecting portions 2123 can cooperate to define a plurality of recessed grooves for accommodating the first lug 2221. Thus, the first lug 2221 can be flush with the lower surface of the recess 2122, or the recess 2122 can protrude from the lower surface of the first lug 2221, so that the recess 2122 can abut against the connected components when connected to the mounting beam 600, improving the reliability of the fastening connection.

[0163] In some embodiments of the present application, on one side edge of the support plate 22 facing away from the main board 21 in the third direction Z, a relief groove 223 recessed toward the main board 21 is formed, and the relief groove 223 is used to avoid the inlet portion 411 and the outlet portion 412.

[0164] As Figure 6 shown, the relief groove 223 can be formed at the middle position of the support portion. In the direction from the support plate 22 to the main board 21, the width of the relief groove 223 can gradually decrease. Thus, it is beneficial to the processing and forming of the relief groove 223 and reduces stress concentration.

[0165] In the above technical solution, by providing the relief groove 223 on the support plate 22 to avoid the inlet portion 411 and the outlet portion 412 of the heat exchange tube 410, the mutual interference between the support plate 22 and the inlet portion 411 and the outlet portion 412 can be reduced, making the layout more compact and reasonable.

[0166] In some embodiments of the present application, the plurality of plate bodies further include: a reinforcing plate 30, the reinforcing plate 30 extends along the first direction X, the reinforcing plate 30 is disposed between the first plate 10 and the second plate 20, and is connected to the first plate 10 and the second plate 20.

[0167] Among them, the number of the reinforcing plates 30 can be one or more. The reinforcing plate 30 can be a flat plate connected between the first plate 10 and the second plate 20, or a bent plate, and the present application does not make specific limitations thereto.

[0168] In the above technical solution, since the reinforcing plate 30 is disposed between the first plate 10 and the second plate 20, the reinforcing plate 30 can enhance the overall structural strength of the first expansion beam 100 and improve the anti-expansion effect on the battery cell 300.

[0169] In some embodiments of the present application, the reinforcing plate 30 includes: a flat plate portion 31 and a bent portion 32. The flat plate portion 31 is attached to and connected to the surface of the first plate 10. The bent portion 32 is connected to the flat plate portion 31 and forms a U-shaped structure extending along the first direction X and opening toward the first plate 10 in the second direction Y.

[0170] As Figure 5 and Figure 6 shown, the reinforcing plate 30 may include a plurality of flat plate portions 31 and at least one bending portion 32. The plurality of flat plate portions 31 may be arranged at intervals along the length direction or the height direction of the first expansion beam 100. The surface of the flat plate portion 31 may be attached to the surface of the first plate 10 facing the second plate 20. The bending portion 32 is connected between two adjacent flat plate portions 31. Specifically, both ends of the bending portion 32 are respectively connected to the two flat plate portions 31, and the middle portion of the bending portion 32 protrudes toward the second plate 20 and is welded to the second plate 20.

[0171] Furthermore, the bending portion 32 includes two side plates and a bottom plate. The bottom plate is a flat plate extending along the length direction and the height direction of the first expansion beam 100, and the surface of the bottom plate is attached to the surface of the second plate 20 facing the first plate 10. The two side plates are respectively connected to the two side edges in the width direction of the bottom plate and extend toward the first plate 10 along the thickness direction of the first expansion beam 100 to be connected to the flat plate portion 31. Among them, the side plates and the bottom plate may be vertically arranged, and the connection position between the side plates and the bottom plate may be arc-connected to reduce stress concentration.

[0172] In the above technical solution, by making the reinforcing plate 30 include the flat plate portion 31 connected to the first plate 10 and the bending portion 32 that protrudes and bends toward the second plate 20, it is not only convenient to weld the reinforcing plate 30 to the first plate 10 and the second plate 20, but also can improve the structural strength of the reinforcing plate 30 and enhance the overall strength of the first expansion beam 100.

[0173] In some embodiments of the present application, the number of the bending portions 32 is multiple, and the multiple bending portions 32 are arranged at intervals along the first direction X. The flat plate portion 31 is connected between two adjacent bending portions 32 and is connected to both sides of the multiple bending portions 32 in the first direction X.

[0174] That is to say, the number of the bending portions 32 may be two, three, four or more, etc. In this way, in the height direction of the first expansion beam 100, the reinforcing plate 30 can be connected to the first plate 10 and the second plate 20 respectively through the multiple flat plate portions 31 and the multiple bending portions 32. In this way, the uniformity of the structural reinforcement of the first plate 10 and the second plate 20 by the reinforcing plate 30 in the height direction of the first expansion beam 100 can be improved. The overall structural strength of the first expansion beam 100 is enhanced.

[0175] For example, the reinforcing plate 30 may include three flat plate portions 31 and two bending portions 32. The two bending portions 32 are arranged at intervals up and down and are connected between two adjacent flat plate portions 31.

[0176] Furthermore, a plurality of weight-reducing holes are formed on the bottom plate and / or side plate of the bending portion 32, and the plurality of weight-reducing holes are arranged at intervals along the length direction of the reinforcing plate 30. Thus, the amount of material used can be reduced, the weight of the reinforcing plate 30 can be reduced, the weight of the first expansion beam 100 can be reduced, and the energy density of the battery device 1000 can be improved.

[0177] In the above technical solution, by arranging a plurality of bending portions 32 on the reinforcing plate 30, the structural strength of the reinforcing plate 30 can be further enhanced, the structural strength of the first expansion beam 100 can be enhanced, and the uniformity of the structural reinforcement of the first plate 10 and the second plate 20 by the reinforcing plate 30 in the height direction of the first expansion beam 100 can also be improved, thereby reducing the weak strength area of the first expansion beam 100.

[0178] In some embodiments of the present application, the reinforcing plate 30 also includes: a third folded edge 33, the third folded edge 33 is connected to the flat plate portion 31, the third folded edge 33 has a plurality of second lugs 331 extending away from the first plate 10 along the second direction Y, the plurality of second lugs 331 are arranged at intervals along the first direction X, the plurality of second lugs 331 are clamped between the first folded edge 212 and the second folded edge 222, and are welded to the first folded edge 212 and the second folded edge 222.

[0179] like Figure 6 As shown, the third folding edge 33 includes a folding edge body and a plurality of second lugs 331. The flat plate portion 31 closest to the support plate 22 among the plurality of flat plate portions 31 is the first flat plate portion 31. The folding edge body is connected to an edge of one side of the first flat plate portion 31 close to the support plate 22, and the folding edge body is in the shape of a long strip extending from one end to the other end along the length direction of the first expansion beam 100. The plurality of second lugs 331 are connected to an edge of one side of the folding edge body away from the first flat plate portion 31, and extend into a rectangular plate shape along the thickness direction and the length direction of the first expansion beam 100. An avoidance hole for avoiding the recessed portion 2122 on the first folding edge 212 is defined between two adjacent second lugs 331.

[0180] When welding the first expansion beam 100 , the connection portion 2123 on the first folded edge 212 , the second lug 331 on the third folded edge 33 , and the first lug 2221 on the second folded edge 222 are stacked in sequence, and then the three layers are welded together.

[0181] In the above technical solution, since the reinforcing plate 30 is further provided with a third folded edge 33, and the third folded edge 33 is connected between the first folded edge 212 and the second folded edge 222, the third folded edge 33 can enhance the connection strength at the connection position of the first folded edge 212 and the second folded edge 222, improve the reliability of the fastening connection between the first folded edge 212 and the main box 200. At the same time, a plurality of second lugs 331 arranged at intervals can define a relief hole for relieving the recess 2122 of the first folded edge 212, reducing the probability of interference between the third folded edge 33 and the fastener passing through the first fixing hole 2121.

[0182] In some embodiments of the present application, the battery device 1000 further includes: a first connecting plate 510 and a second connecting plate 520. The first connecting plate 510 is fixed to the side wall of the main box 200 by a fastener. Both ends of the first plate 10 in the first direction X are provided with first connecting holes 13 penetrating the first plate 10 in the second direction Y. The first plate 10 is fixedly connected to the first connecting plate 510 by a fastener passing through the first connecting holes 13. The second connecting plate 520 is fixed to the side wall of the main box 200 by a fastener. Both ends of the second plate 20 in the first direction X are provided with second connecting holes 213 penetrating the second plate 20 in the second direction Y. The second plate 20 is fixedly connected to the second connecting plate 520 by a fastener passing through the second connecting holes 213.

[0183] As Figure 7 and Figure 8 shown, the first connecting plate 510 is provided with a first hole and a second hole penetrating the first connecting plate 510 in the thickness direction. One end of the first connecting plate 510 is fixed to the side wall of the main box 200 by a fastener passing through the first hole and the first fastening hole on the side wall of the main box 200. At the same time, the other end of the first connecting plate 510 is fixedly connected to the first plate 10 by a fastener passing through the second hole and the first connecting hole 13 on the first plate 10. That is to say, on the side where the first plate 10 is located, both ends in the length direction of the first expansion beam 100 are fixedly connected to the main box 200 through the first connecting plate 510.

[0184] The second connecting plate 520 is provided with a third hole and a fourth hole penetrating the second connecting plate 520 in the thickness direction. One end of the second connecting plate 520 is fixed to the side wall of the main box 200 by a fastener passing through the third hole and the second fastening hole on the side wall of the main box 200. At the same time, the other end of the second connecting plate 520 is fixedly connected to the second plate 20 by a fastener passing through the fourth hole and the second connecting hole 213 on the second plate 20. That is to say, on the side where the second plate 20 is located, both ends in the length direction of the first expansion beam 100 are fixedly connected to the main box 200 through the second connecting plate 520.

[0185] Among them, the number of the first connecting plates 510 is two. The two first connecting plates 510 respectively fix the two ends of the first plate 10 in the length direction to two opposite inner side walls of the main box 200 in the first direction X. The number of the second connecting plates 520 is two. The two second connecting plates 520 respectively fix the two ends of the second plate 20 in the length direction to two opposite inner side walls of the main box 200 in the first direction X.

[0186] In this way, both sides of the first expansion beam 100 in the thickness direction are fixed to the inner wall of the main box 200 through the first connecting plate 510 and the second connecting plate 520 respectively. Thereby, not only can the fastening connection between the first expansion beam 100 and the main box 200 be conveniently realized, but also the connection reliability between the first expansion beam 100 and the main box 200 can be improved.

[0187] Furthermore, both the first connecting plate 510 and the second connecting plate 520 are connected to the first expansion beam 100 through rivet nuts. Among them, the first expansion beam 100 includes a reinforcing plate 30. A hollow hole is formed on the flat plate portion 31 of the reinforcing plate 30. The hollow hole is directly opposite to the first connection hole 13 on the first plate 10 in the thickness direction of the first expansion beam 100. In this way, on the premise that the reinforcing plate 30 extends to the edges at both ends of the first plate 10 in the length direction, the interference between the reinforcing plate 30 and the rivet nut passing through the first connection hole 13 can be reduced.

[0188] In one example, the first connecting plate 510 includes two sub-plate portions arranged in an L shape. The two sub-plate portions are respectively attached to the surface of the first plate 10 and the inner wall surface of the main box 200. Further, the two sub-plate portions are arc-connected. Further, a first rib is formed at the connection position of the two sub-plate portions.

[0189] In one example, the second connecting plate 520 includes a first section, a second section, and an inclined section connected between the first section and the second section. The first section is a plate body and is attached to the side wall of the main box 200. The third hole is formed on the first section. The second section is a plate shape and is attached to the surface of the second plate 20. The fourth hole is formed on the second section. The inclined section is a plate body inclined with respect to both the first section and the second section, and both ends of the inclined section are arc-connected to both the first section and the second section respectively.

[0190] Furthermore, a second rib is formed on the second connecting plate 520. The second rib extends from one end of the second connecting plate 520 in the first direction X to the other end to improve the structural strength of the second connecting plate 520. The number of the third holes is multiple, and the multiple third holes are respectively arranged on both sides of the second rib in the third direction Z. The number of the fourth holes is multiple, and the multiple fourth holes are respectively arranged on both sides of the second rib.

[0191] In the above technical solution, since the battery device 1000 also includes a first connecting plate 510 and a second connecting plate 520, and the first expansion beam 100 is fixed to the inner wall of the main box 200 on both sides in the thickness direction by the first connecting plate 510 and the second connecting plate 520 respectively, it is not only convenient to realize the fastening connection between the first expansion beam 100 and the main box 200, but also can improve the connection reliability between the first expansion beam 100 and the main box 200.

[0192] In some embodiments of the present application, the mounting beam 600 extends along a first direction and is arranged on a side of the first expansion beam 100 that is away from the battery cell 300 in a second direction, and the first expansion beam 100 is connected to the mounting beam 600 by fasteners and / or is adhesively connected by an adhesive layer 800, and the first direction intersects the second direction.

[0193] like Figure 9 and Figure 10 As shown, the mounting beam 600 and the first expansion beam 100 both extend along the first direction, and the mounting beam 600 is arranged on the side of the first expansion beam 100 away from the battery cell 300 . In other words, the first expansion beam 100 is arranged on the side of the mounting beam 600 facing the battery cell 300 .

[0194] In one example, at least part of the surface of the first expansion beam 100 has an electrophoretic coating. Specifically, the first expansion beam 100 can be an integral part independent of the main box 200. After the first expansion beam 100 is formed, it can be placed in an electrophoresis tank for electrophoresis to form an electrophoretic coating on the surface of the first expansion beam 100. The electrophoretic coating can reduce the probability of the first expansion beam 100 being corroded during the long-term use of the battery device 1000, thereby increasing the service life of the first expansion beam 100.

[0195] The first expansion beam 100 and the mounting beam 600 may be connected only by fasteners, or only by adhesive layer 800, or by both fasteners and adhesive layer 800.

[0196] The first expansion beam 100 can be directly bonded to the mounting beam 600 through the bonding layer 800. Furthermore, the bonding layer 800 can be a structural adhesive. Similarly, the first expansion beam 100 can be directly bonded to the mounting beam 600 through a fastener, or can be indirectly fastened to the mounting beam 600 through a fastener. The fasteners connected between the first expansion beam 100 and the mounting beam 600 include but are not limited to bolts, studs, rivet nuts, etc.

[0197] During the assembly process of the battery device 1000, the main box 200, the first expansion beam 100, and / or the mounting beam 600 can be surface-treated first (such as insulation spraying and electrophoresis), then the heat management component 400 is fixed to the bottom wall 202 of the main box 200, and then the mounting beam 600 is fixed to the bottom wall 202 of the main box 200 through fasteners. Finally, the first expansion beam 100 is fixed to the mounting beam 600 through fasteners and the adhesive layer 800, and both ends of the first expansion beam 100 are fixed to the side wall of the main box 200 through the first connecting plate 510 and the second connecting plate 520.

[0198] In this way, not only can the heat exchange tube 410 of the heat management component 400 be embedded between the main box 200 and the first expansion beam 100, but it is also convenient to surface-treat the main box 200, the mounting beam 600, and the first expansion beam 100 respectively before assembling the battery device, improving the corrosion resistance and insulation performance of the main box 200, the first expansion beam 100, and the mounting beam 600.

[0199] Moreover, after electrophoresis, the first expansion beam 100 is not welded to the main box 200 and the mounting beam 600, but is directly bonded to the mounting beam 600 through the adhesive layer 800 and connected through fasteners, and is connected to the main box 200 through fasteners. Thus, the connection and fixation between the first expansion beam 100 and the mounting beam 600 are not affected by the electrophoresis coating, and the mounting beam 600 and the first expansion beam 100 are doubly connected through fasteners and the adhesive layer 800, which can further improve the connection reliability and stability between the mounting beam 600 and the first expansion beam 100, reduce the probability of loosening and failure of the fasteners due to the long-term force on the first expansion beam 100, and thus achieve the reliable connection between the first expansion beam 100 and the mounting beam 600 under the condition of surface treatment. In addition, it is also convenient for the assembly between the first expansion beam 100 and the mounting beam 600, improving the assembly efficiency.

[0200] In the above technical solution, since the first expansion beam 100 and the mounting beam 600 are connected through fasteners and / or bonded through the adhesive layer 800, it is not only convenient for the assembly between the first expansion beam 100 and the mounting beam 600, improving the assembly efficiency, but also convenient for the first expansion beam 100 and the mounting beam 600 to carry out their respective required surface pre-treatments to improve the corrosion resistance and insulation performance of the first expansion beam 100 and the mounting beam 600, thereby improving the flexibility of surface treatment, saving treatment costs, and improving production efficiency. In addition, the first expansion beam 100 and the mounting beam 600 are fixedly connected through fasteners and the adhesive layer 800, which can further improve the connection reliability and stability between the first expansion beam 100 and the mounting beam 600.

[0201] In some embodiments of the present application, the first expansion beam 100 has a first flange 212 extending towards the mounting beam 600. The first flange 212 is supported on the top of the mounting beam 600, and the first flange 212 and the mounting beam 600 are connected by fasteners.

[0202] Combined Figure 5 As shown, the first expansion beam 100 includes a first plate 10, a second plate 20 and a reinforcing plate 30. The second plate 20 includes a support plate 22 and a main plate 21. The lower side edge of the main plate 21 is provided with a first flange 212, the upper side edge of the support plate 22 is provided with a second flange 222, and the lower side edge of the reinforcing plate 30 is provided with a third flange 33. The first flange 212, the third flange 33 and the second flange 222 are stacked and welded in sequence from top to bottom, and constitute the support edge of the first expansion beam 100. When assembling the battery device 1000, the support edge is supported on the top of the mounting beam 600 and fixedly connected to the top of the mounting beam 600 through a plurality of fasteners. Thus, the first expansion beam 100 can be conveniently and fixedly connected to the mounting beam 600, improving the assembly efficiency.

[0203] In the above technical solution, since the mounting beam 600 is arranged on one side in the thickness direction of the first expansion beam 100, and the first expansion beam 100 is tightly connected to the top of the mounting beam 600 through the first flange 212, the first flange 212 can play a positioning role, facilitating the fixing of the first expansion beam 100 on the mounting beam 600 and improving the assembly efficiency.

[0204] In some embodiments of the present application, as Figure 9 and Figure 10 shown, the mounting beam 600 includes two first beams 610. Both of the two first beams 610 extend along the first direction X and are arranged at intervals in the first direction X. The two first beams 610 are fixed to the bottom wall 202 of the main box 200, and an avoidance channel 203 is formed between the two first beams 610.

[0205] In the above technical solution, since the mounting beam 600 includes two first beams 610 arranged at intervals, and the avoidance channel 203 is formed between the two first beams 610, it is convenient to form the avoidance channel 203, facilitating the inlet part 411 and the outlet part 412 of the heat exchange tube 410 to pass through the mounting beam 600 and be connected to the current collector 420, simplifying the structure, reducing the forming difficulty of the avoidance channel 203, and reducing the processing difficulty of the mounting beam 600.

[0206] In some embodiments of the present application, the first beam 610 includes a beam body 611, a first support edge 612, and a second support edge 613. The beam body 611 extends along the first direction X and has a U-shaped cross-section. The first support edge 612 and the second support edge 613 are respectively connected to the two side edges of the opening of the beam body 611 and extend away from each other. Both the first support edge 612 and the second support edge 613 are connected to the bottom wall 202 of the main box 200. The first support edge 612 is located on the side of the beam body 611 facing the first expansion beam 100, and the bottom surface of the first expansion beam 100 in the third direction Z is supported on the first support edge 612.

[0207] For example, as Figures 9 - 11 shown, the cross-section of the first beam 610 is in a "ji" shape, and the opening of the first beam 610 faces the bottom wall 202 of the main box 200. The U-shaped beam body 611 can enhance the structural strength of the first beam 610 and reduce the weight of the first beam 610. The first support edge 612 and the second support edge 613 are respectively arranged on both sides of the beam body 611, which can not only increase the contact area between the first beam 610 and the bottom wall 202 of the main box 200 and enhance the support stability between the first beam 610 and the bottom wall 202 of the main box 200, but also facilitate the fastening connection between the first beam 610 and the bottom wall 202 of the main box 200 through the first support edge 612 and / or the second support edge 613.

[0208] In the above technical solution, by making the first beam 610 include a U-shaped beam body 611 and the first support edge 612 and the second support edge 613 connected to the two side edges of the opening of the beam body 611, the structural strength of the first beam 610 can be improved, the support stability between the first beam 610 and the bottom wall 202 of the main box 200 can be increased, and it is convenient for the first beam 610 to be fixedly connected to the main box 200 through the first support edge 612 and / or the second support edge 613.

[0209] In some embodiments of the present application, the bottom surface of the first support edge 612 and the first expansion beam 100 are adhesively connected through an adhesive layer, and / or, the side surface of the beam body 611 facing the first support edge 612 in the second direction Y and the first expansion beam 100 are adhesively connected through an adhesive layer 800.

[0210] That is to say, an adhesive layer 800 can be provided only on the surface of the first support edge 612 facing the first expansion beam 100 in the third direction Z for adhesive connection with the first expansion beam 100, or an adhesive layer 800 can be provided only on the side surface of the beam body 611 facing the first support edge 612 in the second direction Y for adhesive connection with the first expansion beam 100, or an adhesive layer 800 can be provided on both the surface of the first support edge 612 facing the first expansion beam 100 in the third direction Z and the side surface of the beam body 611 facing the first support edge 612 in the second direction Y to adhesively connect the first expansion beam 100.

[0211] In the above technical solution, by providing an adhesive layer 800 on the surface of the first support edge 612 and / or the side surface of the beam body 611, the adhesive connection between the first expansion beam 100 and the first beam 610 of the mounting beam 600 can be achieved, thereby realizing the adhesive connection between the first expansion beam 100 and the mounting beam 600, further improving the connection reliability between the first expansion beam 100 and the mounting beam 600, reducing the assembly difficulty, and improving the assembly efficiency.

[0212] In some embodiments of the present application, the mounting beam 600 further includes: a connecting beam 620, the connecting beam 620 extends along the first direction X and is connected between the two first beams 610, the connecting beam 620 is spaced apart from the inner wall of the accommodating cavity 201, and the connecting beam 620, the two first beams 610 and the bottom wall 202 of the main box 200 enclose an avoidance channel 203.

[0213] For example Figures 9 - 11 As shown, the connecting beam 620 can be a U-shaped beam opening towards the bottom wall 202 of the main box 200, and the two ends of the connecting beam 620 can be respectively lap-connected to the two first beams 610. Specifically, one end of the first beam 610 facing the connecting beam 620 is a lap end, and the dimensions of the beam body 611 of the lap end in the second direction Y and the third direction Z are both smaller than the dimensions of the beam body 611 of the rest of the first beam 610. Both ends of the connecting beam 620 cover the lap end, and the beam body 611 of the connecting beam 620 and the lap end can be connected by fasteners. Among them, a first through hole is formed on the side wall of the beam body 611 of the lap end, a second through hole is formed on the side wall of the connecting beam 620, and the fastener can pass through the first through hole and the second through hole to achieve the fastening connection between the connecting beam 620 and the lap end.

[0214] Wherein, the edge of one end of the connecting beam 620 facing the bottom wall 202 of the main box 200 is spaced apart from the bottom wall 202 of the main box 200. For example, the distance between the connecting beam 620 and the bottom wall 202 of the main box 200 can be greater than or equal to 8 mm. In this way, an avoidance channel 203 with a sufficient height can be formed between the connecting beam 620 and the bottom wall 202 of the main box 200, so that the inlet portion 411 and the outlet portion 412 of the heat exchange tube 410 can pass through the avoidance channel 203.

[0215] In the above technical solution, since the mounting beam 600 further includes a connecting beam 620, and the connecting beam 620 is connected between the two mounting beams 600, in this way, the mounting beam 600 can be a continuous beam structure in the first direction X, and can continuously support the first expansion beam 100 in the first direction X. Therefore, the support stability of the mounting beam 600 for the first expansion beam 100 can be improved. In addition, it is also convenient to define the avoidance channel 203.

[0216] In some embodiments of the present application, the mounting beam 600 further includes a bracket 630. The bracket 630 is fixed to the inner wall of the accommodation cavity 201 and is arranged between two first beams 610. The connecting beam 620 is supported on the bracket 630.

[0217] Wherein, the number of the brackets 630 can be one, or can be multiple. For example, one, two, three, five or seven or more brackets 630 can be arranged between two first beams 610. Thus, the number of the brackets 630 can be set according to actual support requirements, as long as the inlet portion 411 and the outlet portion 412 of the heat exchange tube 410 are not blocked from passing through the mounting beam 600.

[0218] In the above technical solution, by arranging the bracket 630 between two first beams 610 to support the connecting beam 620, the support effect on the connecting beam 620 can be improved, the structural strength of the connecting beam 620 can be enhanced, and further the structural strength of the first expansion beam 100 can be enhanced.

[0219] In some embodiments of the present application, the bracket 630 includes: a support plate 631 and a plurality of support legs 632. The plurality of support legs 632 are arranged along the circumferential direction of the support plate 631. The support leg 632 includes a support section 6321 arranged in an L shape and an extension section 6322. The support section 6321 is connected to the bottom wall 202 of the main box 200. The extension section 6322 extends away from the support section 6321 along the third direction Z. The support plate 631 is connected to one end of the extension sections 6322 of the plurality of support legs 632 away from the support section 6321. The connecting beam 620 is supported on the support plate 631 and is fixed to the support plate 631 through fasteners.

[0220] For example, the number of the support legs 632 can be two, three, four, five or more. By arranging a plurality of support legs 632, the structural strength of the bracket 630 can be improved, and the force uniformity of the support plate 631 in the circumferential direction of the support plate 631 can be enhanced.

[0221] Further, the bracket 630 is an integrally formed part. The support plate 631 and the support legs 632 can be connected by an arc, and the support section 6321 and the extension section 6322 can also be connected by an arc. Thus, the stress concentration on the bracket 630 can be reduced.

[0222] For example Figure 10 and Figure 11As shown, the bracket 630 includes a support plate 631 and four support legs 632. Two of the four support legs 632 are symmetrically arranged with respect to the first direction X, and the other two support legs 632 are symmetrically arranged with respect to the second direction Y. The support plate 631 is arranged between the four support legs 632 and is connected to the extension segments 6322 of the four support legs 632. The support segments 6321 are connected to one end of the extension segments 6322 facing away from the support plate 631 in the third direction Z and are on the side of the extension segments 6322 facing away from the support plate 631 in the thickness direction. Thus, it is convenient to support the bracket 630 on the bottom wall 202 of the main box 200, and the mutual interference between the support segments 6321 of the multiple support legs 632 can be reduced.

[0223] Furthermore, a third through hole penetrating the support plate 631 in the up-down direction can be formed on the support plate 631. The connecting beam 620 can be disposed on the upper side of the bracket 630 and supported on the support plate 631, and then fixedly connected to the support plate 631 through fasteners passing through the third through hole.

[0224] In the above technical solution, since the bracket 630 includes a support plate 631 and multiple support legs 632 supporting the support plate 631, the structure of the bracket 630 can be simplified, the support stability of the bracket 630 for the connecting beam 620 can be improved, and it is convenient to fixedly connect the connecting beam 620 and the bracket 630.

[0225] In some embodiments of the present application, the battery device 1000 may further include: a second expansion beam 700, the second expansion beam 700 extends along the first direction X and is spaced from the first expansion beam 100 in the second direction Y. The battery cells 300 are arranged between the first expansion beam 100 and the second expansion beam 700, and the structure of the second expansion beam 700 may be the same as or different from the structure of the first expansion beam 100.

[0226] The battery device 1000 includes multiple columns of battery cells 300 arranged in sequence along the first direction X. Each column of battery cells 300 includes multiple battery cells 300 arranged in layers in sequence along the second direction Y. The first expansion beam 100 and the second expansion beam 700 are respectively arranged on both sides of the multiple battery cells 300 in the second direction Y to limit the expansion of the multiple battery cells 300 in the second direction Y.

[0227] Furthermore, a first fixing point may be provided at the top of the first expansion beam 100, a second fixing point may be provided at the top of the second expansion beam 700, and the first fixing point and the second fixing point may be connected by a pull rod. In this way, the anti-expansion force of the first expansion beam 100 and the second expansion beam 700 on the battery cells 300 can be enhanced, and the expansion of the battery cells 300 can be effectively inhibited.

[0228] Among them, the number of the first fixed points can be multiple, the number of the second fixed points can be multiple, and the number of the tie rods is multiple. The multiple first fixed points, the multiple second fixed points and the multiple tie rods correspond to each other one by one.

[0229] In a specific example, the second expansion beam 700 may include a first plate 10, a second plate 20 and a reinforcing plate 30. The reinforcing plate 30 is disposed between the first plate 10 and the second plate 20. The first plate 10, the second plate 20 and the reinforcing plate 30 may all be integrally formed independent components, and the first plate 10, the second plate 20 and the reinforcing plate 30 may be connected by welding.

[0230] In the above technical solution, since the battery device 1000 further includes a second expansion beam 700, the second expansion beam 700 can cooperate with the first expansion beam 100 to jointly inhibit the expansion of the battery cell 300 in the second direction Y.

[0231] In some embodiments of the present application, the heat management member 400 includes a heat exchange tube 410. An installation groove 204 is formed on the bottom wall 202 of the main box 200. The heat exchange tube 410 is disposed in the installation groove 204 and extends along the extension direction of the installation groove 204.

[0232] The installation groove 204 may extend along the extension direction of the heat exchange tube 410. The heat exchange tube 410 is disposed in the installation groove 204, and the upper surface of the heat exchange tube 410 may be flush with the bottom wall 202 of the main box 200 or protrude upward beyond the bottom wall 202 of the main box 200 to facilitate fitting with the bottom surface of the battery cell 300.

[0233] Furthermore, an adhesive layer may be provided on the inner wall of the installation groove 204, and the heat exchange tube 410 may be adhesively connected to the inner wall of the installation groove 204 through the adhesive layer.

[0234] The number of the heat exchange tubes 410 of the heat management member 400 can be multiple. The multiple heat exchange tubes 410 can be arranged at intervals. For example, the number of the heat exchange tubes 410 can be two. The two heat exchange tubes 410 are symmetrically arranged in the first direction X. Each heat exchange tube 410 includes a first heat exchange section and a second heat exchange section. The first heat exchange section is bent into a U shape, and the openings of the first heat exchange sections of the two heat exchange tubes 410 face each other. The second heat exchange section is disposed inside the first heat exchange section and connected to the first heat exchange section. The second heat exchange section includes a plurality of straight pipe portions extending along the second direction Y. The plurality of straight pipe portions are arranged at intervals in the first direction X and are sequentially connected. Adjacent two straight pipe portions are connected by a bent pipe portion. The shape of the installation groove is adapted to the bent shape of the heat exchange tube 410.

[0235] In the above technical solution, since the mounting groove 204 is formed on the bottom wall 202 of the main case 200 and the heat exchange tube 410 is arranged in the mounting groove 204, it is convenient to arrange the heat exchange tube 410, reduce the space occupied by the heat exchange tube 410 in the accommodation cavity 201, make the structure compact, and improve the energy density of the battery device 1000.

[0236] In a second aspect, the embodiment of the present application further provides an electrical device 1A, including the battery device 1000 of any of the above embodiments.

[0237] In the above technical solution, since the electrical device 1A is provided with the battery device 1000, on the one hand, the battery device 1000 is provided with the mounting beam 600, the first expansion beam 100 is mounted on the main case 200 through the mounting beam 600, and the inlet portion 411 and the outlet portion 412 of the heat management member 400 pass through the avoidance channel 203 formed by the mounting beam 600. This enables the heat management member 400 to be installed prior to the first expansion beam 100, reducing the mutual influence between the installation of the first expansion beam 100 and the heat management member 400 and improving the installation efficiency. On the other hand, since the first expansion beam 100 and the mounting beam 600 are detachably engaged, the first expansion beam 100 and the mounting beam 600 can be respectively subjected to the surface treatments required for each of them. For example, the first expansion beam 100 can be subjected to anti-corrosion treatment, and the mounting beam 600 can be subjected to insulation treatment, etc., improving the flexibility of the surface treatment, saving the treatment cost, and improving the production efficiency.

[0238] Next, reference will be made to Figures 2 - 11 describe the battery device 1000 according to a specific embodiment of the present application.

[0239] As Figure 2 、 Figure 3 and Figure 4 shown, the battery device 1000 includes a plurality of battery cells 300, a main case 200, a heat management member 400, a first expansion beam 100, a second expansion beam 700, a first connection plate 510, a second connection plate 520, a mounting beam 600 and two tie rods. The plurality of battery cells 300 are arranged in the main case 200.

[0240] Specifically, the main case 200 defines an accommodation cavity 201 with a rectangular cross-section that is open at the top. The first expansion beam 100 and the second expansion beam 700 are both arranged in the accommodation cavity 201. The first expansion beam 100 and the second expansion beam 700 both extend along the width direction of the main case 200 and are arranged at intervals in the length direction of the main case 200. The plurality of battery cells 300 are arranged between the first expansion beam 100 and the second expansion beam 700.

[0241] As Figure 5 and Figure 6As shown in the figure, the first expansion beam 100 includes: a first plate 10, a second plate 20, and a reinforcing plate 30. The first plate 10 is a vertically arranged and horizontally extending plate. The upper side edge of the first plate 10 is provided with a first flanging 11, and the lower side edge is provided with a second flanging 12. The left and right ends of the first plate 10 are respectively provided with first connection holes 13 that penetrate the first plate 10 in the front-rear direction.

[0242] The second plate 20 includes: a main board 21 and a support board 22. The main board 21 is arranged on the upper side of the support board 22. The main board 21 is a vertically arranged and horizontally extending plate. The upper side edge of the main board 21 is provided with a third flanging 211, and the lower side edge is provided with a first folding edge 212. The left and right ends of the main board 21 are respectively formed with second connection holes 213 that penetrate the main board 21 in the front-rear direction. The first folding edge 212 includes connecting parts 2123 and concave parts 2122 arranged alternately in the left-right direction. The left and right ends of the concave part 2122 are respectively connected to the connecting part 2123 and the middle part is recessed downward. Each concave part 2122 is formed with a first fixing hole 2121 that penetrates up and down. Two adjacent concave parts 2122 and the connecting part 2123 cooperate to define a recessed groove.

[0243] The support board 22 is a vertically arranged and horizontally extending plate. The upper side edge of the support board 22 is provided with a third folding edge 33, and the lower side edge is provided with a fourth flanging 221. The third folding edge 33 has a plurality of first lug ears 2221 arranged at intervals in the left-right direction. An avoidance notch 2222 is defined between two adjacent first lug ears 2221. The lower side edge of the support board 22 is formed with an upwardly recessed avoidance groove 223, and the avoidance groove 223 is located at the middle position of the support board 22 in the left-right direction.

[0244] The reinforcing plate 30 includes three flat plate parts 31, two bending parts 32, and a third folding edge 33. The flat plate parts 31 are flat plates that extend horizontally and are vertically arranged. The bending parts 32 are connected between two adjacent upper and lower flat plate parts 31, and the cross-section of the bending part 32 is U-shaped and opens towards the first plate 10. The third folding edge 33 is horizontally arranged and connected to the lower side edge of the lowermost flat plate part 31. The third folding edge 33 has a plurality of second lug ears 331 arranged at intervals left and right. The plurality of second lug ears 331, the plurality of first lug ears 2221, and the plurality of connecting parts 2123 correspond one by one, and each second lug ear 331 is clamped between the corresponding connecting part 2123 and the first lug ear 2221.

[0245] Further, a plurality of welding holes are formed on the main board 21. The welding holes are long strip holes extending in the left-right direction. The plurality of welding holes correspond to the bending parts 32 of the reinforcing plate 30, and the main board 21 can be welded to the bending parts 32 of the reinforcing plate 30 at the positions of the plurality of welding holes.

[0246] There are two first connecting plates 510, which are respectively arranged at both ends of the first plate 10 in the left - right direction. One end of the first connecting plate 510 is connected to the first plate 10 through fasteners, and the other end is also connected to the side wall of the main box 200 in the left - right direction through fasteners. There are two second connecting plates 520, which are respectively arranged at both ends of the main board 21 in the left - right direction. One end of the second connecting plate 520 is fixedly connected to the second plate 20 through fasteners, and the other end is also connected to the side wall of the main box 200 in the left - right direction through fasteners.

[0247] The mounting beam 600 includes two first beams 610, a connecting beam 620 and a bracket 630. The two first beams 610 are arranged at intervals in the left - right direction. The cross - section of the first beam 610 is in a "ji" shape and is fixed on the bottom wall 202 of the main box 200. The bracket 630 is a four - claw bracket 630, which is arranged between the two first beams 610. The two ends of the connecting beam 620 are lapped with the two first beams 610, and the middle part of the connecting beam 620 is supported on the bracket 630.

[0248] The assembly process of the battery device 1000 of this embodiment is described below.

[0249] Step 1: Assemble the first expansion beam 100. Specifically, weld four sheet metal parts, namely the first plate 10, the main board 21, the support plate 22 and the reinforcement plate 30, into one body to form the first expansion beam 100. Then, pre - perform electrophoresis on the first expansion beam 100 to form an electrophoretic coating on the surface of the first expansion beam 100. When welding the first expansion beam 100, the first flange 11 is lap - welded with the third flange 211, the second flange 12 is lap - welded with the fourth flange 221, the first folded edge 212, the second folded edge 222 and the third folded edge 33 are welded in three - layer, the first plate 10 is spot - welded to the flat part 31 of the reinforcement plate 30, and the main board 21 is welded to the bent part 32 of the reinforcement plate 30.

[0250] Step 2: Assemble the main box 200, the cold plate and the mounting beam 600. Specifically, weld the two first beams 610 and the bracket 630 of the mounting beam 600 to the main box 200. Then, perform electrophoresis on the main box 200 (which has been welded with the first beams 610 and the bracket 630), and perform insulation spraying on the part of the bottom wall 202 of the main box 200 corresponding to the battery cell 300. Then, bond the heat management part 400 to the bottom wall 202 of the main box 200. Then, fix the connecting beam 620 of the mounting beam 600 to the two first beams 610 and the bracket 630 through fasteners.

[0251] Step 3: Fix the first expansion beam 100 to the main box 200. Specifically, support the first expansion beam 100 in Step 1 on the mounting beam 600, such that the side wall of the beam body 611 of the first beam 610 and the upper surface of the first support edge 612 are adhesively connected to the first expansion beam 100, and rivet-connect the first expansion beam 100 to the mounting beam 600. Then, fasten the two ends of the first connection plate 510 to the left and right side walls of the first plate 10 of the first expansion beam 100 and the main box 200 respectively, and fasten the second connection plate 520 to the left and right side walls of the second plate 20 of the first expansion beam 100 and the main box 200 respectively.

[0252] For the battery device 1000 according to this embodiment, the first expansion beam 100 is an independent integral part. After the surface treatment (electrophoresis and insulation spraying) of the first expansion beam 100, the mounting beam 600, and the main box 200 can be completed separately, the first expansion beam 100 can be reliably connected to the main box 200 through fasteners and the adhesive layer 800.

[0253] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A main box (200), wherein the main box (200) defines a receiving chamber (201); A battery cell (300) is arranged in the accommodation cavity (201); A mounting beam (600) is mounted on the bottom wall (202) of the main box (200) and forms an avoidance passage (203) with the bottom wall (202); A first expansion beam (100) is detachably mounted on the mounting beam (600) and cooperates with the battery cell (300); A heat management component (400) is disposed in the accommodating cavity (201) and cooperates with the battery cell (300) in heat exchange. The heat management component (400) has an inlet portion (411) and an outlet portion (412). At least one of the inlet portion (411) and the outlet portion (412) is disposed in the avoidance channel (203).

2. The battery device according to claim 1, characterized in that, The first expansion beam (100) comprises a plurality of plates, each of which is a sheet metal part, and the plurality of plates are welded together to form the first expansion beam (100).

3. The battery device according to claim 2, wherein The plurality of plate bodies include: a first plate (10) and a second plate (20), wherein the first plate (10) and the second plate (20) extend along a first direction (X) and are arranged in a second direction (Y), and in a third direction (Z), two ends of the first plate (10) are respectively connected to two ends of the second plate (20) and cooperate to define a cavity of the first expansion beam (100), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other.

4. The battery device according to claim 3, characterized in that, In the third direction (Z), the two ends of the first plate (10) have a first flange (11) and a second flange (12) extending toward the second plate (20), and the two ends of the second plate (20) have a third flange (211) and a fourth flange (221) extending toward the first plate (10), the first flange (11) is overlapped and connected with the third flange (211), and the second flange (12) is overlapped and connected with the fourth flange (221).

5. The battery device according to claim 3, characterized in that, The second plate (20) comprises: a main plate (21) and a support plate (22) which are separately arranged, the main plate (21) being arranged on a side of the support plate (22) away from the bottom wall (202) in the third direction (Z), the main plate (21) being provided with a first folded edge (212) extending away from the second plate (20) along the second direction (Y), the support plate (22) being provided with a second folded edge (222) extending away from the second plate (20) along the second direction (Y), the first folded edge (212) and the second folded edge (222) being arranged in a stacked manner and connected.

6. The battery device according to claim 5, characterized in that, The first folded edge (212) is formed with a plurality of first fixing holes (2121) penetrating the first folded edge (212) along the third direction (Z), the plurality of first fixing holes (2121) are arranged at intervals along the first direction (X), and the first expansion beam (100) is connected to the mounting beam (600) by fasteners passing through the first fixing holes (2121).

7. The battery device according to claim 6, characterized in that, The first hem (212) includes a plurality of connecting portions (2123) and a plurality of concave portions (2122). The plurality of concave portions (2122) and the plurality of connecting portions (2123) are alternately arranged and connected along the first direction. The concave portions (2122) are recessed from the first hem (212) toward the support plate (22). At least one first fixing hole (2121) is formed in each concave portion (2122). The second hem (222) includes a plurality of first lugs (2221) extending away from the first plate (10) in the second direction (Y). The plurality of first lugs (2221) are spaced apart along the first direction (X). A clearance notch (2222) is defined between two adjacent first lugs (2221). Wherein, the concave portions (2122) are located within the clearance notches (2222), and the plurality of connecting portions (2123) and the plurality of first lugs (2221) are in one-to-one correspondence and connected to each other.

8. The battery device according to claim 5, characterized in that, On one side edge of the support plate (22) facing away from the main board (21) in the third direction (Z), a relief groove (223) recessed toward the main board (21) is formed. The relief groove (223) is used to avoid the inlet portion (411) and the outlet portion (412).

9. The battery device according to claim 5, characterized in that, The plurality of plate bodies further include: a reinforcing plate (30). The reinforcing plate (30) extends along the first direction (X). The reinforcing plate (30) is disposed between the first plate (10) and the second plate (20) and is connected to the first plate (10) and the second plate (20).

10. The battery device according to claim 9, characterized in that, The reinforcing plate (30) includes: a flat plate portion (31) and a bent portion (32). The flat plate portion (31) is attached to and connected to the surface of the first plate (10). The bent portion (32) is connected to the flat plate portion (31) and is formed into a U-shaped structure extending along the first direction (X) and opening toward the first plate (10) in the second direction (Y).

11. The battery device according to claim 10, characterized in that, The number of the bent portions (32) is plural. The plurality of bent portions (32) are spaced apart along the first direction (X). The flat plate portion (31) is connected between two adjacent bent portions (32) and on both sides of the plurality of bent portions (32) in the first direction (X).

12. The battery device according to claim 10, wherein, The reinforcing plate (30) further includes: a third hem (33). The third hem (33) is connected to the flat plate portion (31). The third hem (33) has a plurality of second lugs (331) extending away from the first plate (10) in the second direction (Y). The plurality of second lugs (331) are spaced apart along the first direction (X). The plurality of second lugs (331) are clamped between the first hem (212) and the second hem (222) and are welded to the first hem (212) and the second hem (222).

13. The battery device according to claim 3, characterized in that, Further included: a first connecting plate (510), the first connecting plate (510) being fixed to the side wall of the main box (200) by means of fasteners, the first plate (10) being provided with first connecting holes (13) penetrating the first plate (10) along the second direction (Y) at both ends in the first direction (X), the first plate (10) being fastened and connected to the first connecting plate (510) by means of fasteners passing through the first connecting holes (13); A second connecting plate (520), the second connecting plate (520) is fixed to the side wall of the main box (200) by fasteners, and the second plate (20) is provided with second connecting holes (213) passing through the second plate (20) along the second direction (Y) at both ends in the first direction (X), and the second plate (20) is fastened and connected to the second connecting plate (520) by fasteners passing through the second connecting holes (213).

14. The battery device according to any one of claims 1-13, characterized in that, The mounting beam (600) extends along a first direction and is arranged on a side of the first expansion beam (100) that is away from the battery cell (300) in a second direction, and the first expansion beam is connected to the mounting beam via a fastener and / or is bonded via an adhesive layer (800), and the first direction intersects with the second direction.

15. The battery device according to claim 14, characterized in that, The first expansion beam (100) has a first folded edge (212) extending toward the mounting beam (600), the first folded edge (212) is supported on the top of the mounting beam (600), and the first folded edge (212) is connected to the mounting beam (600) via a fastener.

16. The battery device according to claim 15, characterized in that, The mounting beam (600) comprises two first beams (610), the two first beams (610) both extend along a first direction and are arranged at intervals in the first direction (X), the two first beams (610) are both fixed to the bottom wall (202), and the avoidance channel is formed between the two first beams (610).

17. The battery device according to claim 16, wherein The first beam (610) comprises a beam body (611), a first supporting edge (612) and a second supporting edge (613); the beam body (611) extends along a first direction (X) and has a U-shaped cross section; the first supporting edge (612) and the second supporting edge (613) are respectively connected to two side edges of an opening of the beam body (611) and extend away from each other; the first supporting edge (612) and the second supporting edge (613) are both connected to the bottom wall (202); The first supporting edge (612) is located on a side of the beam body (611) facing the first expansion beam (100), and the bottom surface of the first expansion beam (100) in the third direction (Z) is supported on the first supporting edge (612).

18. The battery device according to claim 17, wherein, The first supporting edge (612) is adhesively connected to the bottom surface of the first expansion beam via the adhesive layer (800), and / or the side surface of the beam body (611) facing the first supporting edge (612) in the second direction (Y) is adhesively connected to the first expansion beam (100) via the adhesive layer (800).

19. The battery device according to claim 16, wherein, The mounting beam (600) further includes: a connecting beam (620) that extends along the first direction (X) and is connected between the two first beams (610). The connecting beam (620) is spaced apart from the inner wall of the accommodating cavity. The connecting beam (620), the two first beams (610), and the bottom wall (202) enclose the avoidance channel.

20. The battery device according to claim 19, characterized in that, The mounting beam (600) further includes a bracket (630). The bracket (630) is fixed to the bottom wall (202) and is arranged between the two first beams (610). The connecting beam (620) is supported on the bracket (630).

21. The battery device according to claim 20, wherein The bracket (630) includes: a support plate (631) and a plurality of legs (632). The plurality of legs (632) are arranged circumferentially along the support plate (631). Each leg (632) includes a support section (6321) and an extension section (6322) arranged in an L shape. The support section (6321) is connected to the bottom wall (202). The extension section (6322) extends away from the support section (6321) along the third direction (Z). The support plate (631) is connected to one end of the extension sections (6322) of the plurality of legs (632) that is away from the support section (6321). The connecting beam (620) is supported on the support plate (631) and is fixed to the support plate (631) by fasteners.

22. The battery device according to any one of claims 1-13, characterized in that, Further included is: A second expansion beam (700) that extends along the first direction (X) and is arranged at an interval from the first expansion beam (100) in the second direction (Y). The battery cell (300) is arranged between the first expansion beam and the second expansion beam. The structure of the second expansion beam (700) is the same as or different from the structure of the first expansion beam (100).

23. The battery device according to any one of claims 1-13, characterized in that, The heat management member (400) includes a heat exchange tube (410). An installation groove (204) is formed on the bottom wall (202). The heat exchange tube (410) is arranged in the installation groove (204) and extends along the extension direction of the installation groove (204).

24. An electrical device, characterized in that, Including the battery device (1000) according to any one of claims 1 - 23.

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