Battery device, energy storage device and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device, an energy storage device and a power utilization device. The battery device comprises a first box body and an expansion beam, the first box body comprises a supporting plate and a frame, and the supporting plate and the frame define a containing space; at least part of the expansion beam is located in the containing space, and the expansion beam is connected with the supporting plate and the frame. The expansion beam and the first box body are made of the same material and are integrally formed. According to the battery device, the energy storage device and the power utilization device provided by the invention, the failure risk of the joint of the expansion beam and the first box body can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery device, an energy storage device, and an electrical device. Background Art

[0002] At present, the expansion beam is generally prepared separately from the first box of the battery and then connected. Among them, the first box is generally made by a sheet metal stamping process, or a combination of multiple profiles. The expansion beam is made by extrusion, rolling and other processes. The expansion beam is connected to the support plate and frame in the first box by welding, bolting and other methods. Using the above method, the connection between the expansion beam and the first box is prone to failure and other problems. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device, an energy storage device and an electrical device, aiming to reduce the risk of failure at the connection between the expansion beam and the first box body.

[0004] In the first aspect, an embodiment of the present application provides a battery device, including a battery cell, a first box body and an expansion beam, the first box body includes a support plate and a frame, the frame is arranged on one of the plate surfaces of the support plate, and the frame and the support plate form a accommodating space; at least a portion of the battery cell is arranged in the accommodating space; at least a portion of the expansion beam is located in the accommodating space and is used to abut against the battery cell; the expansion beam is connected to the support plate and the frame respectively; the expansion beam and the frame are made of the same material and the two are integrally formed.

[0005] The battery device provided by this solution changes the processing and assembly process of the expansion beam and the first box body that were originally prepared separately, and uses an integrated molding process to integrally mold the expansion beam and the frame to obtain an integrated structure. Compared with the process of first preparing the first box body and the expansion beam separately and then connecting them, the integral molding of the first box body and the expansion beam eliminates the step of reconnecting the frame and the expansion beam, which simplifies the processing technology of the battery device to a certain extent. In addition, the expansion beam and the frame in the battery device provided by the embodiment of the present application are made of the same material, which is compared with the related art in which the two are made of different materials, so that the thermal expansion coefficients of the expansion beam and the frame are more matched and the mechanical properties are consistent, and the strength of the connection interface between the expansion beam and the frame is higher and the stress is lower, and it is not easy to form cracks or defects, which improves the reliability of the combined structure of the first box body and the expansion beam, thereby reducing the risk of failure of the battery device at the connection between the first box body and the expansion beam during use.

[0006] In some embodiments, the expansion beam, the frame, and the support plate are made of the same material, and the three are integrally formed.

[0007] The expansion beam, frame and support plate in the battery device provided in this embodiment are made of the same material. Compared with the related art in which the expansion beam, frame and support plate are made of different materials, the thermal expansion coefficients of the expansion beam, frame and support plate can be more matched and the mechanical properties can be consistent. The strength of the connection interface between the expansion beam, frame and support plate can be higher and the stress can be lower, and it is not easy to form cracks or defects, thereby improving the reliability of the combined structure of the frame, support plate and expansion beam, thereby reducing the risk of failure of the battery device at the connection between the frame, support plate and expansion beam during use.

[0008] In some embodiments, a cavity is provided in the expansion beam, so that the weight of the expansion beam can be reduced, making the overall weight of the battery device lighter.

[0009] In some embodiments, the expansion beam includes a first wall, a second wall and a connecting structure. The first wall is used to abut against the battery cell along a first direction. The first wall is connected to the support plate, and at least one end of the first wall along the second direction is connected to the frame. The second direction is set at an angle to the first direction. The second wall is arranged on a side of the first wall away from the battery cell, and is spaced apart from the first wall in the first direction. The connecting structure is connected between the first wall and the second wall, and the connecting structure, the first wall and the second wall are arranged to form a cavity. The expansion beam adopts the structure provided by this embodiment, which can make the structure of the expansion beam simple and easy to design and process.

[0010] In some embodiments, the connection structure includes a third wall. The third wall extends along the second direction and is connected to both the first wall and the second wall. The second direction may be the length direction of the first wall. When the connection structure is composed of a third wall, the length of the third wall may be equivalent to or slightly less than the length of the first wall, and the third wall may be arranged on the center line of the first wall in the second direction, or may be arranged at other positions. The center line in the second direction refers to the geometric center line of the first wall extending along the second direction. In this case, the structure of the connection structure is simple and easy to prepare.

[0011] When the connection structure includes a plurality of third walls, the plurality of third walls can be arranged at intervals along the height direction of the first wall, and the lengths of the plurality of third walls can be respectively equal to the length of the first wall. In this way, compared with only one third wall, the connection structure can provide a greater support strength for the first wall, so that the first wall can withstand a larger expansion force exerted by the battery cell, and the structure of the battery device can be more stable.

[0012] In some embodiments, the third wall, the first wall and the second wall at least enclose a groove structure with the opening facing the side where the support plate is located, so as to facilitate the integrated molding preparation of the third wall, the first wall and the second wall.

[0013] In some embodiments, the connecting structure further includes a fourth wall located within at least one space enclosed by the first wall, the second wall, and the third wall and connected to the first wall, the second wall, and the third wall; the fourth wall extends in a third direction that forms an angle with the second direction. The provision of the fourth wall can cooperate with the third wall to support different regions and at different angles of the first wall, enabling the first wall to withstand a large expansion force exerted by the battery cell and making the structure of the battery device more stable.

[0014] In some embodiments, the third wall is located in the middle of the spaced-apart space between the first wall and the second wall, and there are two sets of fourth walls. Each set of fourth walls includes a plurality of fourth walls. The two sets of fourth walls are respectively disposed on both sides of the third wall in the third direction and are connected to the two plate surfaces of the third wall respectively. With the solution provided in this embodiment, the fourth wall and the third wall can form structures similar to a cross shape, a feng character shape, etc. Compared with only providing one set of fourth walls, providing two sets of fourth walls can further improve the ability of the first wall to resist lateral forces, improve the structural stability of the expansion beam to a certain extent, and the cooperation of the third wall and the fourth wall can better distribute the load, contributing to improving the overall load-bearing capacity of the expansion beam.

[0015] In some embodiments, at least one fourth wall is arranged offset in the third direction from the fourth walls in the other set. With this arrangement, compared with the two sets of fourth walls being symmetrically arranged, the fourth walls can support the first wall in more regions, making the structure of the expansion beam more stable and having a stronger load-bearing capacity.

[0016] In some embodiments, the two sets of fourth walls are arranged staggered in the second direction. With the solution provided in this embodiment, the support strengths of different regions of the first wall can be made comparable, making the structure of the expansion beam more stable and having a stronger load-bearing capacity.

[0017] In some embodiments, both the fourth wall and the third wall are plate-shaped, and their plate surfaces are both flat. In this way, compared with the plate surfaces of the fourth wall or the third wall being curved or other shapes, it is more convenient for the design and processing of the fourth wall and the third wall.

[0018] In some embodiments, the fourth wall is perpendicular to the third wall. With the solution provided in this embodiment, the fourth wall and the third wall can form structures similar to an "L" shape, a "T" shape, a cross shape, etc. Compared with only providing the third wall, the provision of the fourth wall can improve the ability of the first wall to resist lateral forces to a certain extent, improve the structural stability of the expansion beam to a certain extent, and the cooperation of the third wall and the fourth wall can better distribute the load, contributing to improving the overall load-bearing capacity of the expansion beam.

[0019] In some embodiments, the expansion beam includes a first wall having a first surface, and the first surface is the surface of the first wall for contacting the battery cell and is perpendicular to the support plate.

[0020] The expansion beam and the first box body are integrally formed, and there is more than one integral forming process. Regardless of the process used to make the expansion beam and the first box body, it is necessary to make the surface (first surface) of the expansion beam that is used to contact the battery cell perpendicular to the support plate. In this way, after the battery cell is installed in the accommodating space of the battery device, the battery cell can fit with the first wall, so that the force on the battery cell is stable, and it can also maintain good contact with the first wall in the expanded state, so that the performance of the battery device is stable.

[0021] In some embodiments, the expansion beam is provided with a mounting structure, and the mounting structure is used to connect with an external device. The solution provided by this embodiment is adopted to facilitate the installation of the battery device during use.

[0022] In some embodiments, the mounting structure includes a boss and a through structure, wherein the boss is provided on the expansion beam; the through structure is provided on the boss and penetrates the boss along the height direction of the expansion beam. The mounting structure adopts the structure provided in this embodiment, which facilitates the battery device to be connected to the external device through bolts, screws, etc.

[0023] In some embodiments, two groups of mounting structures are provided, and the two groups of mounting structures are respectively provided at both ends of the expansion beam in the second direction. With the structure provided in this embodiment, both ends of the battery device can be connected to the external device by bolts, screws, etc., which is conducive to the stable installation of the battery device.

[0024] In some embodiments, the connection structure further includes a support portion, the support portion is located in the cavity and between the third wall and the frame, the support portion is connected to the first wall, the second wall, the third wall and the frame; the mounting structure is provided on the support portion. The provision of the support portion can increase the structural stability of the connection between the expansion beam and the frame.

[0025] In some embodiments, the connection structure further includes an edge portion, the edge portion is located in the cavity, and the edge portion connects the third wall and the support portion. The arrangement of the edge portion can make the arrangement of the third wall and the support portion unaffected by the connection relationship between each other, making the design and preparation of the third wall and the support portion easier.

[0026] In some embodiments, the assembly of the first box body and the expansion beam is a die-casting. The assembly of the first box body and the expansion beam is made by a die-casting process, which has at least the following advantages compared to other one-piece molding processes: first, high production efficiency, suitable for mass production; second, high dimensional accuracy, no or only very little subsequent processing is required after the assembly of the first box body and the expansion beam is made by the die-casting process to meet the final use requirements; third, good surface quality, a smooth surface can be obtained directly, reducing subsequent grinding or polishing work; fourth, high mechanical properties, such as strength and hardness, especially under the condition of correct design and material selection, die-casting can meet most mechanical performance requirements.

[0027] In a second aspect, an embodiment of the present application provides an energy storage device, comprising a plurality of battery devices provided by any of the above schemes, the battery device being used to store or provide electrical energy.

[0028] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery device or an energy storage device provided by any of the above schemes, and the battery device or the energy storage device is used to store or provide electrical energy.

[0029] The effects of the second to third aspects are the same as those of the first aspect and will not be repeated here.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0034] Figure 3 A schematic diagram of the three-dimensional structure of a first box in a battery device provided in some embodiments of the present application;

[0035] Figure 4 for Figure 3A schematic diagram of the main structure of the first box in the battery device shown;

[0036] Figure 5 For along Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0037] Figure 6 The expansion beam edge of the battery device provided in some embodiments of the present application Figure 4 Schematic diagram of the cross-sectional structure in the BB direction;

[0038] Figure 7 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0039] Figure 8 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application.

[0040] The reference numerals in the specific implementation manner are as follows:

[0041] 1000. Vehicles;

[0042] 100, battery device; 200, controller; 300, motor; 400, energy storage device;

[0043] 10. Box; 11. Second box; 12. First box; 20. Battery cell; 30. Mounting structure; 31. Boss; 32. Through structure; 41. Cabinet; 42. Battery cluster; 43. Thermal management module; 44. Main control module; 45. Master control module; 46. Power distribution module; 47. Fire protection module;

[0044] 121, support plate; 122, frame; 123, accommodating space; 50, expansion beam; 50a, first surface;

[0045] 51. first wall; 52. second wall; 53. connecting structure;

[0046] 531, third wall; 532, fourth wall; 533, support portion; 534, side portion;

[0047] a. Groove structure. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of 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 the specific circumstances.

[0056] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0057] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0058] The capacity or power of a single battery cell is limited, and often cannot meet the use requirements of some equipment or devices. For this reason, many devices are equipped with multiple battery cells, and the capacity or power of the battery is expanded by connecting multiple battery cells in series, in parallel or in a mixed manner. Multiple battery cells are contained in a box. The box generally includes a first box and a second box that are interlocked. Among them, the first box has a accommodating space for supporting the battery cell, and the second box is covered on the first box. During the charging and discharging process, the battery cell will expand due to the embedding or extraction of ions by the positive and negative active materials, the accumulation thickness of the side reactions of the battery cell system, and the peeling of the graphite sheets, which can easily cause the first box supporting the battery cell to deform, thereby affecting the sealing performance of the box. For this reason, in the related art, an expansion beam is generally provided in the first box to limit the expansion of the battery cell.

[0059] However, the current expansion beam is generally set separately from the first box body (including at least the support plate and the frame). Among them, the first box body can be made by a sheet metal stamping process, or it can be composed of a plurality of profiles. The expansion beam is made by extrusion, rolling and other processes, and can be made of one material or a plurality of materials. The expansion beam is connected to the support plate and the frame in the first box body by welding, bolting and other methods. With the above method, the connection between the expansion beam and the first box body is prone to failure.

[0060] For example, the first box body is a sheet metal part, and the expansion beam is a rolled part. The two are formed separately. The two ends of the formed expansion beam are connected to the two side walls of the frame of the first box body by bolts, etc., and the bottom of the expansion beam is connected to the support plate of the first box body by welding. The processing technology is relatively complicated. In addition, since the materials of the first box body and the expansion beam are generally different, the connection between the two is a connection of dissimilar materials, stress concentration is prone to occur at the connection, and the material protection ability of the connection is relatively weak, so it is easy to fail at the connection between the first box body and the expansion beam.

[0061] In order to improve the above problems, an embodiment of the present application provides a battery device. The battery device changes the processing and assembly process of the expansion beam and the first box body, which were originally prepared separately, and uses an integrated molding process to integrally mold the expansion beam and the frame, thereby obtaining an integrated structure. Compared with the process of first preparing the first box body and the expansion beam separately and then connecting them, the integral molding of the frame and the expansion beam eliminates the step of reconnecting the frame and the expansion beam, thereby simplifying the processing of the battery device to a certain extent. In addition, the expansion beam and the frame in the battery device provided by the embodiment of the present application are made of the same material, which is compared with the related art in which the two are made of different materials, so that the thermal expansion coefficients of the expansion beam and the frame are more matched and the mechanical properties are consistent, and the strength of the connection interface between the expansion beam and the frame is higher and the stress is lower, and it is not easy to form cracks or defects, thereby improving the reliability of the combined structure of the first box body and the expansion beam, thereby reducing the risk of failure of the battery device at the connection between the first box body and the expansion beam during use.

[0062] The battery device disclosed in the embodiments of the present application can be used in electrical devices that use the battery device as a power source or various energy storage devices, energy storage systems, and charging networks that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0064] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device (Battery Apparatus) 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for the working power requirements of the vehicle 1000 during startup, navigation and driving.

[0065] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 The schematic diagram of the exploded structure of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the box body 10 .

[0067] There may be multiple battery cells 20, and the multiple battery cells 20 are connected in series, in parallel, or in mixed series through a busbar. As an example, the multiple battery cells 20 may form a battery module, and the battery module is formed by arranging and fixing multiple battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells 20 with a cable tie.

[0068] Each battery cell 20 may be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell 20 is discharged. The battery cell 20 may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the present embodiment of the application. The battery cell may be cylindrical, flat, rectangular, or in other shapes.

[0069] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0070] The box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first box 12 and a second box 11. Among them, the first box 12 has a storage space for accommodating the battery cell 20, and the second box 11 covers the first box. The first box 12 can be a hollow structure with one end open, and the second box 11 can be a plate-like structure. The second box 11 covers the open side of the first box 12, so that the second box 11 and the first box 12 jointly define a storage space; the second box 11 and the first box 12 can also be hollow structures with one side open, and the open side of the second box 11 covers the open side of the first box 12. Of course, the box 10 formed by the second box 11 and the first box 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc. The first box 12 is an important structural bearing component in the new energy vehicle battery system, which is used to store and protect battery cells. It also has an important impact on the collision safety of the entire vehicle and the torsional and bending stiffness of the entire vehicle body.

[0071] Please refer to Figure 3 , Figure 3 The present invention provides a three-dimensional structural diagram of the first box in the battery device provided in some embodiments of the present application. The present application provides a battery device. The battery device includes a battery cell, a first box 12 and an expansion beam 50. The first box 12 includes a support plate 121 and a frame 122. The frame 122 is arranged on one of the plate surfaces of the support plate 121, and the frame 122 and the support plate 121 enclose a receiving space 123. The battery cell is arranged in the receiving space 123.

[0072] At least part of the expansion beam 50 is located in the accommodation space 123 and is used to abut against the battery cell. The expansion beam 50 is connected to the support plate 121 and the frame 122 respectively. The expansion beam 50 and the support plate 121 are made of the same material and are integrally formed. Integrally formed means that the expansion beam 50 and the support plate 121 can be prepared by casting, forging, die casting or other similar integral forming processes.

[0073] Among them, the support plate 121 is a support member for supporting the battery cell 20, and generally adopts a plate-type structure, which can be determined according to the needs of use. The frame 122 is a frame-type structure that is open at both ends of the thickness direction of the support plate 121, is arranged around the support plate 121, and is integrally formed with the support plate 121. The accommodating space 123 with one end open refers to the accommodating space 123 surrounded by the frame 122 and the support plate 121, and the end away from the above-mentioned bearing surface is an open structure to facilitate the placement of the battery cell. The above-mentioned bearing surface refers to the side of the support plate 121 that contacts the battery cell 20.

[0074] One or more expansion beams 50 may be provided, which are generally placed perpendicular to the arrangement direction of the battery cells 20 and in contact with the first side surface of the battery cells 20. The first side surface refers to the side surface with a larger area in the battery cells 20. Since the battery cells 20 are generally rectangular or similar to rectangular structures, the side surface with a larger area refers to the surface formed by the length and width of the battery cells 20.

[0075] The battery device provided in the embodiment of the present application changes the processing and assembly process of the expansion beam 50 and the first box body 12, which were originally prepared separately, and uses an integrated molding process to integrally mold the expansion beam 50 and the frame 122, thereby obtaining an integrated structure. Compared with the process of first separately preparing the frame 122 and the expansion beam 50 and then connecting them, the integral molding of the frame 122 and the expansion beam eliminates the step of reconnecting the frame 122 and the expansion beam 50, thereby simplifying the processing of the battery device to a certain extent. In addition, the expansion beam 50 and the frame 122 in the battery device provided in the embodiment of the present application are made of the same material, which is compared with the related art that the two are made of different materials, so that the thermal expansion coefficients of the expansion beam 50 and the frame 122 are more matched and the mechanical properties are consistent, and the strength of the connection interface between the expansion beam 50 and the frame 122 is higher and the stress is lower, and it is not easy to form cracks or defects, thereby improving the reliability of the combined structure of the first box body 12 and the expansion beam, thereby reducing the risk of failure of the battery device at the connection between the first box body 12 and the expansion beam during use.

[0076] In some embodiments, the expansion beam 50, the frame 122, and the support plate 121 are made of the same material and are integrally formed.

[0077] The expansion beam 50, the frame 122 and the support plate 121 in the battery device provided in this embodiment are made of the same material. Compared with the related art in which the two are made of different materials, the thermal expansion coefficients of the expansion beam 50, the frame 122 and the support plate 121 can be more matched and the mechanical properties can be consistent. The strength of the connection interface between the expansion beam 50 and the frame 122 and the support plate 121 can be higher and the stress can be lower, and it is not easy to form cracks or defects, thereby improving the reliability of the combined structure of the frame 122, the support plate 121 and the expansion beam 50, thereby reducing the risk of failure of the battery device at the connection between the frame 122, the support plate 121 and the expansion beam 50 during use.

[0078] See also Figure 4 and Figure 5 , Figure 4 for Figure 3 A schematic diagram of the front structure of the first box 12 in the battery device shown; Figure 5 For along Figure 4Schematic diagram of the cross-sectional structure along the AA direction. In some embodiments, a cavity is provided inside the expansion beam 50. This can reduce the weight of the expansion beam 50, making the overall weight of the battery device lighter.

[0079] In some embodiments, the expansion beam 50 includes a first wall 51, a second wall 52, and a connecting structure 53. The first wall 51 is used to abut against the battery cell 20 along the first direction X. The first wall 51 is connected to the support plate 121, and at least one end of the first wall 51 along the second direction Y is connected to the frame 122. The second direction Y is set at an angle to the first direction X. The second wall 52 is set on the side of the first wall 51 away from the battery cell 20, and is spaced apart from the first wall 51 in the first direction. The connecting structure 53 is connected between the first wall 51 and the second wall 52, and the connecting structure 53, the first wall 51, and the second wall 52 are surrounded to form a cavity.

[0080] The first direction X is the arrangement direction of the battery cells 20 , and the second direction Y is generally a direction perpendicular to the first direction X, and may also be a direction forming other angles (such as 60°, 85°, etc.) with the first direction X.

[0081] The first wall 51 and the second wall 52 are generally both flat plate structures, but can also be curved plate structures. The above flat plate structure means that both surfaces of the plate body are flat. The above curved plate structure means that at least one surface of the plate body is a curved surface. It should be noted that the above first wall 51 is a curved plate structure, which means that the surface of the first wall 51 other than the first surface 50a can be a curved surface. The above second wall 52 is a curved plate structure, which means that any surface of the second wall 52 can be a curved surface structure. Figure 5 As shown, in some embodiments, the first wall 51 is a rectangular plate, the first direction is perpendicular to the plate surface, and is also the arrangement direction of the battery cells, and the second direction is perpendicular to the first direction. In other embodiments, the second direction can also be set at other angles with the first direction, which can be determined according to the use requirements.

[0082] The first wall 51 and the second wall 52 can be respectively equal thickness structures, that is, plates with the same thickness in different regions; or they can be respectively non-equal thickness structures, that is, plates with different thickness in different regions. For example, when the expansion beam 50 is made by a molding process such as die casting, due to the existence of the draft angle, the plate surface of the first wall 51 and the second wall 52 has a certain slope, so that the thickness of the first wall 51 and the second wall 52 in the height direction of the expansion beam 50 gradually increases from the side away from the support plate 121 to the side close to the support plate 121. Among them, the draft angle is an important design parameter in molding processes such as casting and die casting. It refers to an inclined angle deliberately set on the side of the mold in the mold design in order to allow the molded parts to be smoothly removed from the mold. The design of the draft angle is to prevent the parts from getting stuck in the mold during the demolding process, causing damage to the parts or the mold.

[0083] The connecting structure 53 is a structure connecting the first wall 51 and the second wall 52, and can be a continuous structure or a discontinuous structure, and can include one component or multiple components, which can be determined according to the use requirements. For example, the connecting structure 53 can include one or more flat plate structures connected to the first wall 51 and the second wall 52 approximately perpendicularly, and can also include a curved plate connecting the first wall 51 and the second wall 52, and can also include a convex edge connecting the first wall 51 and the second wall 52, etc., which can be determined according to the use requirements. The above-mentioned approximately perpendicular means that the flat plate structure can be perpendicular to the plate surface of the first wall 51 or the second wall 52, or at an angle within 90°±10°.

[0084] The expansion beam 50 adopts the structure provided by this embodiment, which can make the structure of the expansion beam 50 simple and easy to design and process.

[0085] In some embodiments, the connection structure 53 includes a third wall 531 . The third wall 531 extends along the second direction Y and is connected to both the first wall 51 and the second wall 52 .

[0086] The third wall 531 can be a flat plate structure or a curved plate structure. The third wall 531 can be a uniform thickness structure or a non-uniform thickness structure, which can be determined according to the use requirements.

[0087] It should be noted that, when the connection structure 53 includes a plurality of third walls 531 , the parameters such as structure and size of each third wall 531 may be the same or different.

[0088] When the connection structure 53 is composed of a third wall 531, the length of the third wall 531 can be equal to or slightly less than the length of the first wall 51, and the third wall 531 can be arranged on the center line in the second direction or at other positions. The center line in the second direction refers to the geometric center line extending along the second direction in the first wall 51. In this case, the connection structure 53 has a simple structure and is easy to prepare.

[0089] When the connection structure 53 includes a plurality of third walls 531, the plurality of third walls 531 may be arranged at intervals along the height direction Y of the first wall 51, and the lengths of the plurality of third walls 531 may be respectively equal to the length of the first wall 51. In this way, compared with only one third wall 531, the connection structure 53 may provide a greater support strength for the first wall 51, so that the first wall 51 can withstand a larger expansion force applied by the battery cell 20, and the structure of the battery device 100 may be more stable.

[0090] Figure 6 The expansion beam edge of the battery device provided in some embodiments of the present application Figure 4 Schematic diagram of the cross-sectional structure in the BB direction. Figure 6 As shown, in some embodiments, the third wall 531, the first wall 51, and the second wall 52 at least enclose a groove structure a with an opening toward the side where the support plate 121 is located. The third wall 531 in this embodiment is located on the side of the support plate 121 facing the battery cell 20, and there is a certain gap between the third wall 531 and the support plate 121 in the height direction of the first wall 51.

[0091] In this embodiment, the third wall 531 can be flush with the end of the first wall 51 and the second wall 52 away from the support plate 121 in the height direction, or can be located between the two ends of the first wall 51 and the second wall 52 in the height direction. It can be understood that when the third wall 531 is flush with the end of the first wall 51 and the second wall 52 away from the support plate 121 in the height direction, the third wall 531 and the first wall 51 and the second wall 52 only enclose a groove-shaped structure a with an opening toward the side where the support plate 121 is located; when the third wall 531 is located between the two ends of the first wall 51 and the second wall 52 in the height direction, the third wall 531 and the first wall 51 and the second wall 52 not only enclose a groove-shaped structure a with an opening toward the side where the support plate 121 is located, but also can enclose a groove-shaped structure with an opening toward the side away from the support plate 121.

[0092] By adopting the solution provided in this embodiment, the third wall 531, the first wall 51, and the second wall 52 at least enclose a groove structure with an opening toward the side where the support plate 121 is located, so that the third wall 531 can be made by a process such as die casting, which is convenient for the integrated molding preparation of the third wall 531, the first wall 51, and the second wall 52. In some embodiments, the connecting structure 53 also includes a fourth wall 532. The fourth wall 532 is located in at least one space enclosed by the first wall 51, the second wall 52, and the third wall 531, and is connected to the first wall 51, the second wall 52, and the third wall 531. The fourth wall 532 extends along the third direction Z, and the third direction Z forms an angle with the second direction Y.

[0093] The third wall 531 can be connected to the ends of the first wall 51 and / or the second wall 52 in the height direction, or can be connected to the middle of the first wall 51 and / or the second wall 52 in the height direction, depending on the use requirements. The third wall 531 is connected to the first wall 51 and / or the second wall 52 at different positions to enclose different numbers and shapes of spaces with the first wall 51 and the second wall 52.

[0094] It can be understood that when the two ends of the third wall 531 are respectively connected to the same end of the first wall 51 and the second wall 52 in the height direction, the third wall 531 and the first wall 51 and the second wall 52 form a groove structure with a U-shaped cross-section, and the three of them now form a space with a U-shaped cross-section; when the two ends of the third wall 531 are respectively connected to different ends of the first wall 51 and the second wall 52 in the height direction, the third wall 531 and the first wall 51 and the second wall 52 form a structure with a Z-shaped cross-section, and the three of them now form two spaces with V-shaped cross-sections; when the two ends of the third wall 531 are respectively connected to the middle of the first wall 51 and the second wall 52 in the height direction, the third wall 531 and the first wall 51 and the second wall 52 form a structure with an H-shaped cross-section, and the three of them now form two spaces with C-shaped cross-sections.

[0095] The fourth wall 532 can be a flat plate structure or a curved plate structure. The fourth wall 532 can be a uniform thickness structure or a non-uniform thickness structure, which can be determined according to the use requirements. The fourth wall 532 and the third wall 531 are arranged at an angle, which means that the plate surfaces of the two are arranged at a non-zero angle.

[0096] It should be noted that, when the connection structure 53 includes a plurality of fourth walls 532 , the parameters such as structures and dimensions of the fourth walls 532 may be the same or different.

[0097] The fourth wall 532 can cooperate with the third wall 531 to support different areas and angles of the first wall 51, so that the first wall 51 can withstand the larger expansion force applied by the battery cell 20 and make the structure of the battery device 100 more stable.

[0098] In some embodiments, the third wall 531 is located in the middle of the spaced - apart space between the first wall 51 and the second wall 52. There are two sets of the fourth walls 532. Each set of the fourth walls 532 includes a plurality of the fourth walls 532. The two sets of the fourth walls 532 are respectively disposed on both sides of the third wall 531 in the thickness direction and are respectively connected to the two plate surfaces of the third wall 531.

[0099] The number of the fourth walls 532 in the two sets of the fourth walls 532 may be the same or different, and the structures of the fourth walls 532 in the two sets of the fourth walls 532 may be the same or different. For example, one set of the fourth walls 532 may adopt a flat - plate structure, and the other set of the fourth walls 532 may adopt a curved - plate structure; or both sets of the fourth walls 532 adopt a flat - plate structure, but the included angle between one set of the fourth walls 532 and the third wall 531 is 45°, and the included angle between the other set of the fourth walls 532 and the third wall 531 is 90°. In addition, the two sets of the fourth walls 532 may be symmetrically arranged or asymmetrically arranged.

[0100] Adopting the solution provided in this embodiment, the fourth wall 532 and the third wall 531 can form structures similar to a cross - shape, a feng - character shape, etc. Compared with setting only one set of the fourth walls 532, setting two sets of the fourth walls 532 can further improve the ability of the first wall 51 to resist lateral forces, improve the structural stability of the expansion beam 50 to a certain extent, and the cooperation of the third wall 531 and the fourth wall 532 can better distribute the load, which helps to improve the overall load - bearing capacity of the expansion beam 50.

[0101] In some embodiments, at least one of the fourth walls 532 is stagger - arranged with the fourth walls 532 in the other set in the thickness direction Y of the third wall 531.

[0102] That at least one of the fourth walls 532 is stagger - arranged with the fourth walls 532 in the other set in the thickness direction Y of the third wall 531 means that the connection points of at least one of the fourth walls 532 in the two sets with the third wall 531 and the connection points of any one of the fourth walls 532 in the other set with the third wall 531 are not on the same straight line; it also means that the projections of at least one of the fourth walls 532 in the two sets on one of the plate surfaces of the third wall 531 along the height direction of the expansion beam 50 are stagger - arranged with the projections of any one of the fourth walls 532 in the other set on the above - mentioned plate surface along the height direction of the expansion beam, that is, they are not overlapped. The above - mentioned straight line extends along the thickness direction Y of the third wall 531. Not being overlapped means that the projections of at least one of the fourth walls 532 in the two sets on one of the plate surfaces of the third wall 531 along the height direction of the expansion beam 50 and the projections of any one of the fourth walls 532 in the other set on the above - mentioned plate surface along the height direction of the expansion beam may partially overlap and the other part does not overlap, or may not overlap at all, that is, they are spaced apart.

[0103] Compared with the symmetrical arrangement of two groups of fourth walls 532, this arrangement allows the fourth walls 532 to provide increased support to the first wall 51 in more areas, making the structure of the expansion beam 50 more stable and having a stronger bearing capacity.

[0104] In some embodiments, the two groups of fourth walls 532 are staggered in the length direction X of the third wall 531 .

[0105] The staggered arrangement means that in this embodiment, the projections of the two sets of fourth walls 532 on one of the plate surfaces of the third wall 531 are arranged at intervals along the height direction of the expansion beam 50. Figure 5 As shown, the fourth wall 532 in one group of fourth walls 532 is recorded as the first fourth wall 532a, and the fourth wall 532 in the other group of fourth walls 532 is recorded as the second fourth wall 532b, then the two groups of fourth walls 532 are arranged along the length direction of the third wall 531 in the following order: the first fourth wall 532a, the second fourth wall 532b, the first fourth wall 532a, the second fourth wall 532b, ..., the first fourth wall 532a, the second fourth wall 532b; or, the second fourth wall 532b, the first fourth wall 532a, the second fourth wall 532b, the first fourth wall 532a, ..., the first fourth wall 532a, the second fourth wall 532b.

[0106] By adopting the solution provided in this embodiment, the support strengths of different regions of the first wall 51 can be made equivalent, so that the structure of the expansion beam 50 is more stable and the bearing capacity is stronger.

[0107] In some embodiments, the plate surfaces of the fourth wall 532 and the third wall 531 are both flat.

[0108] Compared with the fourth wall 532 or the third wall 531 having a curved surface or other shapes, this makes it easier to design and process the fourth wall 532 and the third wall 531 .

[0109] In some embodiments, the fourth wall 532 is disposed perpendicular to the third wall 531 .

[0110] The fourth wall 532 and the third wall 531 are arranged perpendicularly, which means that the angle between the plate surface of the fourth wall 532 and the length direction X of the third wall 531 is 90°±5°.

[0111] By adopting the solution provided in this embodiment, the fourth wall 532 and the third wall 531 can form a structure similar to an "L" shape, a "T" shape, a cross shape, etc. Compared with only setting the third wall 531, the setting of the fourth wall 532 can improve the ability of the first wall 51 to resist lateral forces to a certain extent, and improve the structural stability of the expansion beam 50 to a certain extent. The cooperation between the third wall 531 and the fourth wall 532 can better distribute the load, which helps to improve the overall bearing capacity of the expansion beam 50.

[0112] In some embodiments, one third wall 531 is provided, and the third wall 531 is located on a center line of the cavity extending along the second direction Y.

[0113] The center line extending along the second direction refers to a line connecting center points of end surfaces at both ends of the cavity in the second direction.

[0114] By adopting the solution provided in this embodiment, the size of the space above the third wall 531 can be made equivalent to the size of the space below the third wall 531 , and the third wall 531 can provide stable support for the middle part of the first wall 51 .

[0115] In some embodiments, the expansion beam 50 includes a first wall 51. The first wall 51 has a first surface 50a. The first surface 50a is a surface of the first wall 51 for contacting the battery cell 20. The first surface 50a is perpendicular to the support plate 121.

[0116] As mentioned above, the expansion beam 50 is integrally formed with the first box body 12, and there is more than one integral forming process. Regardless of the process used to make the expansion beam 50 and the first box body 12, it is necessary to make the surface (first surface 50a) of the expansion beam 50 that is used to contact the battery cell 20 perpendicular to the support plate 121. In this way, after the battery cell 20 is installed in the accommodating space 123 of the first box body 12, the battery cell 20 can fit with the first wall 51, so that the force on the battery cell 20 is stable, and it can also maintain good contact with the first wall 51 in the expanded state, so that the performance of the battery device 100 is stable.

[0117] See also Figure 5 and Figure 7 , Figure 7 for Figure 5 In the enlarged structural diagram at A, in some embodiments, the expansion beam is provided with a mounting structure 30. The mounting structure 30 is used to connect with an external device.

[0118] The external device refers to a device connected to the first box body 12 in the power-consuming device, energy storage device 400, etc., such as a vehicle frame, a machine frame, etc. The mounting structure 30 refers to a structure capable of mounting the first box body 12 on the above-mentioned external device, and may include a mounting hole, a clamping structure, etc., which may be determined according to the use requirements.

[0119] The solution provided in this embodiment is adopted to facilitate the installation of the first box body 12 during use.

[0120] like Figure 7 As shown, in some embodiments, the mounting structure 30 includes a boss 31 and a through structure 32. The boss 31 is provided on the expansion beam 50. The through structure 32 is provided on the boss 31 and penetrates the boss 31 along the height direction of the expansion beam 50.

[0121] The boss 31 is a protruding structure protruding from the inner wall or outer wall of the expansion beam 50. The through structure 32 can be a through hole, a notch, etc., and can be determined according to the installation requirements of the first box body 12.

[0122] The mounting structure 30 adopts the structure provided in this embodiment, which facilitates the first box body 12 to be connected to an external device through bolts, screws, etc.

[0123] In some embodiments, two groups of mounting structures 30 are provided. The two groups of mounting structures 30 are respectively provided at two ends of the expansion beam 50 in the second direction.

[0124] By adopting the structure provided in this embodiment, both ends of the first box body 12 can be connected to the external device by bolts, screws, etc., which is conducive to the stable installation of the first box body 12.

[0125] like Figure 5 and Figure 7 As shown, in some embodiments, the connection structure 53 also includes a support portion 533. The support portion 533 is located in the cavity and between the third wall 531 and the frame 122. The support portion 533 is connected to the first wall 51, the second wall 52 and the frame 122. The mounting structure 30 is arranged on the support portion 533. The support portion 533 refers to a structure that connects the first wall 51, the second wall 52, the third wall 531 and the frame 122 and plays a certain supporting role. The support portion 533 can be a plate type or a block type, which can be determined according to the use needs. The mounting structure 30 can be arranged in the space surrounded by the first wall 51, the second wall 52, the frame 122 and the support portion 533.

[0126] In this embodiment, the support portion 533 may be connected to the third wall 531 or may not be connected to the third wall 531 , depending on the usage requirements.

[0127] The provision of the support portion 533 can increase the structural stability of the connection between the expansion beam 50 and the frame 122 .

[0128] In some embodiments, the connection structure 53 further includes an edge portion 534 . The edge portion 534 is located in the cavity, and the edge portion 534 connects the third wall 531 and the support portion 533 .

[0129] In this embodiment, the third wall 531 and the support portion 533 may be arranged in parallel, and the edge portion 534 may be a structure such as an inclined plate or a curved plate, which may be determined according to usage requirements.

[0130] The arrangement of the edge portion 534 can prevent the arrangement of the third wall 531 and the support portion 533 from being affected by their connection relationship, making the design and preparation of the third wall 531 and the support portion 533 easier.

[0131] In some embodiments, the assembly of the first box body 12 and the expansion beam 50 is a die casting.

[0132] Die castings are parts made by die casting. Die casting is a molding process in which molten metal is injected into a mold under high pressure.

[0133] It should be noted that after the first box body 12 is made by the die casting process, the surface of the expansion beam 50 generally has a certain slope (usually referred to as "draft slope" or "mold release slope"). This slope is designed to facilitate the removal of the casting from the mold and is essential for the die casting process. Usually, the above slope can range from about 0.5 degrees to about 5 degrees, and the specific value depends on factors such as the shrinkage rate of the material, the height of the die casting, the complexity of the mold, and the wall thickness of the die casting.

[0134] The existence of the above-mentioned inclination has no effect on the other surfaces of the expansion beam 50 except the first surface 50a, but the existence of the above-mentioned inclination on the first surface 50a will make it impossible for the battery cell 20 to fit with the expansion beam 50. In order to fit the first surface 50a with the battery cell 20, generally after the expansion beam 50 is manufactured by the die-casting process, the first surface 50a can be made perpendicular to the support plate 121 by cutting, attaching triangular blocks, wedge blocks, etc. on the first surface 50a.

[0135] The assembly of the first box body 12 and the expansion beam 50 is manufactured by a die-casting process, which has at least the following advantages compared to other one-piece molding processes: First, the production efficiency is high and it is suitable for mass production; second, the dimensional accuracy is high, and after the assembly of the first box body 12 and the expansion beam 50 is manufactured by a die-casting process, no or only very little subsequent processing is required to meet the final use requirements; third, the surface quality is good, a smooth surface can be obtained directly, reducing subsequent grinding or polishing work; fourth, it has higher mechanical properties, such as strength and hardness, and especially with correct design and material selection, die-castings can meet most mechanical performance requirements.

[0136] According to some embodiments of the present application, there is provided an energy storage device, comprising a plurality of battery devices provided by any of the above schemes, wherein the battery devices are used to store or provide electrical energy.

[0137] The energy storage device provided in the embodiment of the present application includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0138] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. Energy storage devices can store electrical energy as needed and output electrical energy at the appropriate time. For example, energy storage devices can store electrical energy during low power consumption periods and provide electrical energy to relevant users or electrical equipment during peak power consumption periods. Energy storage devices can be energy storage containers, energy storage cabinets and other devices used for energy storage.

[0139] For ease of understanding, the structure of the energy storage device is described below by taking the energy storage device as an energy storage cabinet as an example.

[0140] See also Figure 8 , Figure 8 The schematic diagram of the structure of the energy storage device provided in some embodiments of the present application is as follows: The energy storage device 400 includes a cabinet 41 and one or more battery clusters 42 , wherein the battery clusters 42 are accommodated in the cabinet 41 .

[0141] In addition, the energy storage device 400 may also include modules such as a thermal management module 43 , a main control module 44 , a general control module 45 , a power distribution module 46 and a fire protection module 47 .

[0142] As an example, the thermal management module 43 may include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery cells 20 to each battery device 100 through a pipeline.

[0143] As an example, the main control module 44 can be used as a battery management unit of the battery cluster 42 to monitor and manage the battery cluster 42. The main control module 44 can monitor information such as the current, voltage, power or temperature of the battery cluster 42. For example, the charging and discharging current and voltage of the battery cluster 42 can be controlled. The main control module 44 includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0144] As an example, the master control module 45 can be used as a battery management unit of the energy storage device 400 to monitor and manage the energy storage device 400. The master control module 45 can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device 400. For example, the charging and discharging current, voltage, etc. of the energy storage device 400 can be controlled. As an example, the master control module 45 includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (Ethernet, ETH) and a fiber optic conversion module and other modules.

[0145] As an example, the fire protection module 47 includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish the energy storage device 400.

[0146] As an example, the power distribution module 46 may be used to distribute power to modules in the energy storage device 400 that require power.

[0147] The energy storage device provided in the embodiment of the present application, including the battery device provided by any of the above schemes, can achieve the same effect as above, which will not be described in detail here.

[0148] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery device or an energy storage device provided by any of the above solutions. The battery device or the energy storage device is used to store or provide electrical energy.

[0149] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0150] The electrical device provided in the embodiment of the present application, including the above-mentioned battery device or energy storage device, can achieve the same effect as above, which will not be repeated here.

[0151] like Figures 3 to 7 As shown, an embodiment of the present application provides a battery device, which relates to the fields of power batteries, energy storage batteries, mechanical devices, and more particularly to a first box body 12 and an expansion beam 50 structure applied to power batteries. The first box body 12 and the expansion beam 50 in the battery device are integrated and processed as one. Specifically, the above-mentioned first box body 12 and the expansion beam 50 are integrally cast and formed by using an integrated die-casting technology to obtain an integrated cast expansion beam 50 structure. This solution can not only greatly simplify the processing technology of the first box body 12 and the expansion beam 50, but also avoid the connection between the split first box body 12 and the expansion beam 50, improve its reliability, and avoid the risk of failure that may exist at the connection between the first box body 12 and the expansion beam 50 in the later stage.

[0152] Among them, the expansion beam 50 in the battery device 100 plays the role of preventing the battery cell 20 from expanding and deforming during use. In order to better achieve this function, the expansion beam 50 needs to have sufficient anti-expansion force. By designing an excellent reinforcement structure (i.e., the above-mentioned connection structure 53) inside the integrally cast expansion beam 50 and utilizing the high processing freedom of die-casting to achieve the molding of a complex reinforcement structure, the expansion capacity of the expansion beam 50 to resist the battery cell 20 can be well solved, and the above-mentioned reinforcement structure can be optimized according to different anti-expansion force requirements. That is, the battery device provided in this embodiment can further improve the anti-expansion force through the optimized design of the internal reinforcement structure of the expansion beam 50.

[0153] In this embodiment, the expansion beam 50 has a first surface 50 a. The first surface 50 a is a surface of the expansion beam 50 for contacting the battery cell 20. The first surface 50 a is perpendicular to the support plate 121.

[0154] The expansion beam 50 includes a first wall 51, a second wall 52 and a connecting structure 53. The first wall 51 has a first surface 50a. The second wall 52 is located on the side of the first wall 51 away from the battery cell, and the second wall 52 is spaced apart from the first wall 51, forming a cavity therebetween. The connecting structure 53 is located in the cavity, that is, between the first wall 51 and the second wall 52, and connects the first wall 51 and the second wall 52. Both the first wall 51 and the second wall 52 are flat plate structures.

[0155] The connecting structure 53 includes a third wall 531. The length direction of the third wall 531 is parallel to the length direction of the first wall 51. The third wall 531 is located on the center line of the cavity extending along the second direction Y.

[0156] The connecting structure 53 further includes at least one fourth wall 532. The fourth wall 532 is connected to the third wall 531. The plate surfaces of the fourth wall 532 and the third wall 531 are both planes. The plate surface of the fourth wall 532 is perpendicular to the length direction X of the third wall 531.

[0157] There are two groups of fourth walls 532. Each group of fourth walls 532 includes a plurality of fourth walls 532. The two groups of fourth walls 532 are disposed on both sides of the third wall 531 in the thickness direction and are respectively connected to the two plate surfaces of the third wall 531. The two groups of fourth walls 532 are staggered in the length direction X of the third wall 531.

[0158] The bottom of the expansion beam is provided with a mounting structure 30. The mounting structure 30 is used to connect with an external device. The mounting structure 30 includes a boss 31 and a through structure 32. The boss 31 is provided at the bottom of the expansion beam 50. The through structure 32 is provided at the boss 31 and penetrates the boss 31 along the height direction of the expansion beam 50.

[0159] There are two mounting structures 30. The two mounting structures 30 are respectively disposed at two ends of the expansion beam 50 in the length direction.

[0160] The connection structure 53 further includes a support portion 533 and an edge portion 534. The support portion 533 is located at the bottom of the cavity and between the third wall 531 and the frame 122. The support portion 533 is connected to the first wall 51, the second wall 52, the third wall 531 and the frame 122. The mounting structure 30 is disposed on the support portion 533. The edge portion 534 is connected to the end of the third wall 531 in the length direction, and connects the third wall 531 and the support portion 533.

[0161] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; A first box body, comprising a support plate and a frame, wherein the frame is arranged on one of the plate surfaces of the support plate, and the frame and the support plate enclose a containing space; At least part of the battery cell is disposed in the accommodation space; as well as an expansion beam, at least partially located in the accommodating space and used to abut against the battery cell; the expansion beam is connected to the support plate and the frame respectively; The expansion beam and the frame are made of the same material and are integrally formed.

2. The battery device according to claim 1, characterized in that The expansion beam, the frame and the support plate are made of the same material and are integrally formed.

3. The battery device according to claim 1, characterized in that: A cavity is arranged inside the expansion beam.

4. The battery device according to claim 3, characterized in that: The expansion beam comprises: A first wall, used to abut against the battery cell along a first direction; the first wall is connected to the support plate, and at least one end of the first wall along a second direction is connected to the frame; the second direction is arranged at an angle to the first direction; a second wall, disposed on a side of the first wall away from the battery cell and spaced apart from the first wall in the first direction; and A connecting structure is connected between the first wall and the second wall, and the connecting structure, the first wall and the second wall surround and form the cavity.

5. The battery device according to claim 4, characterized in that: The connection structure comprises: The third wall extends along the second direction and is connected to both the first wall and the second wall.

6. The battery device according to claim 5, characterized in that The third wall, the first wall and the second wall at least enclose a groove structure with an opening toward the side where the support plate is located.

7. The battery device according to claim 5, characterized in that: The connection structure also includes: The fourth wall is located in at least one space enclosed by the first wall, the second wall and the third wall, and is connected to the first wall, the second wall and the third wall; the fourth wall extends along a third direction, and the third direction forms an angle with the second direction.

8. The battery device according to claim 7, characterized in that: The third wall is located in the middle of the interval between the first wall and the second wall. The fourth wall is provided in two groups, each group of the fourth walls includes a plurality of the fourth walls, and the two groups of the fourth walls are provided on both sides of the third wall in the third direction.

9. The battery device according to claim 8, characterized in that: At least one of the fourth walls is staggered with respect to the fourth wall in another group in the third direction.

10. The battery device according to claim 8, characterized in that The two groups of fourth walls are staggered in the second direction.

11. The battery device according to claim 7, characterized in that: The fourth wall and the third wall are both in plate shape, and the plate surfaces are both flat.

12. The battery device according to claim 7, characterized in that: The fourth wall is arranged perpendicular to the third wall.

13. The battery device according to any one of claims 1 to 12, characterized in that: The expansion beam includes a first wall, the first wall has a first surface, the first surface is a surface of the first wall for contacting with a battery cell, and the first surface is perpendicular to the support plate.

14. The battery device according to any one of claims 5 to 12, characterized in that: The expansion beam is provided with a mounting structure, and the mounting structure is used to be connected to an external device.

15. The battery device according to claim 14, wherein: The mounting structure comprises: a boss, provided on the expansion beam; and The through structure is arranged on the boss and penetrates the boss along the height direction of the expansion beam.

16. The battery device according to claim 14, characterized in that: The installation structure is provided with two groups, and the two groups of the installation structure are respectively arranged at two ends of the expansion beam in the second direction.

17. The battery device according to claim 14, characterized in that: The connection structure also includes: A support portion, located in the cavity and between the third wall and the frame, the support portion being connected to the first wall, the second wall and the frame; The mounting structure is arranged on the supporting portion.

18. The battery device according to claim 17, characterized in that: The connection structure also includes: An edge portion is located in the cavity, and the edge portion connects the third wall and the support portion.

19. The battery device according to any one of claims 5 to 12, characterized in that: The assembly of the first box body and the expansion beam is a die-casting part.

20. An energy storage device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 19, wherein the battery devices are used to store or provide electrical energy.

21. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 19 or the energy storage device according to claim 20, wherein the battery device or the energy storage device is used to store or provide electrical energy.

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