Battery box, battery and electric device

Abstract

The invention provides a battery box, a battery and an electric device. The battery box comprises a box body and an expansion beam arranged in the box body. The expansion beam comprises a bearing cavity. The bearing cavity comprises an outer bent plate arranged on the outer side in the circumferential direction and an inner bent plate connected with the outer bent plate to separate an inner cavity of the bearing cavity. The outer bent plates comprise the first outer bent plate and the second outer bent plate. And the first outer bent plate and the second outer bent plate are spliced to form the outer contour of the bearing cavity. The distance between the first outer bent plate and the second outer bent plate is adjustable. According to the embodiment of the invention, the bearing cavity of the expansion beam of the battery box body is formed by splicing the outer bent plate and the inner bent plate, so that the bending structure of the outer bent plate and the bending structure of the inner bent plate can be adjusted to adjust the section structure of the bearing cavity; for example, the height of the cross section of the bearing cavity is changed to adapt to different module heights, so that the applicability of the expansion beam is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly to a battery box, a battery and an electrical device. Background Art

[0002] In the related art, in order to resist the expansion force of the battery module in the power battery pack, an expansion beam needs to be arranged in the battery box. How to improve the applicability of the expansion beam is an urgent problem to be solved. Summary of the invention

[0003] In view of the above problems, the present application provides a battery box, a battery and an electrical device to improve the applicability of the expansion beam.

[0004] In a first aspect, the present application provides a battery box including a box body and an expansion beam disposed in the box body. The expansion beam includes a load-bearing cavity. The load-bearing cavity includes an outer bending plate disposed on the circumferential outer side and an inner bending plate connected to the outer bending plate to separate the inner cavity of the load-bearing cavity. The outer bending plate includes a first outer bending plate and a second outer bending plate. The first outer bending plate and the second outer bending plate are spliced ​​to form the outer contour of the load-bearing cavity. The distance between the first outer bending plate and the second outer bending plate can be adjusted.

[0005] The bearing cavity of the expansion beam of the battery box of the embodiment of the present application is formed by splicing an outer bending plate and an inner bending plate. Therefore, the cross-sectional structure of the bearing cavity can be adjusted by adjusting the bending structure of the outer bending plate and the bending structure of the inner bending plate to adapt to different battery modules. For example, the cross-sectional height of the bearing cavity can be changed to adapt to different module heights, thereby improving the applicability of the expansion beam. In addition, the expansion beam of the embodiment of the present application includes a first outer bending plate and a second outer bending plate that form the outer contour of the bearing cavity. The distance between the first outer bending plate and the second outer bending plate can be adjusted, and the distance between the first outer bending plate and the second outer bending plate can be adjusted according to different battery modules, thereby further improving the applicability of the battery box.

[0006] In some embodiments, the first outer bending plate includes a first splicing section spliced ​​with the second outer bending plate. The second outer bending plate includes a second splicing section spliced ​​with the first outer bending plate. The first splicing section and the second splicing section overlap. And the overlapping length of the first splicing section and the second splicing section can be adjusted.

[0007] The overlapping lengths of the first splicing section and the second splicing section can be adjusted, so that the overlapping lengths can be adjusted according to different battery modules to make the expansion beam suitable for different battery modules, the adjustment is simple, and the application range is wider.

[0008] In some embodiments, the first outer bending plate further includes a first main section extending in the height direction and a first segment arranged opposite to the first splicing section. The first segment and the first splicing section are respectively arranged at two ends of the first main section, the first segment is connected to the box body, and a gap is formed between the first segment and the second outer bending plate.

[0009] A gap is provided between the first segment and the inner bending plate to avoid positional interference between the first outer bending plate and the inner bending plate.

[0010] In some embodiments, the first outer bending plate is disposed close to the battery module, the second outer bending plate is disposed away from the battery module, and the second outer bending plate is disposed obliquely.

[0011] The second outer bending plate is tilted to mean that the second outer bending plate is tilted relative to the height direction. Specifically, the middle of the second outer bending plate is closer to the first outer bending plate than the bottom of the second outer bending plate. Such a setting can prevent the expansion beam from tipping over under the action of the expansion force.

[0012] In some embodiments, the first outer bending plate is arranged close to the battery module, the second outer bending plate is arranged away from the battery module, and the inner bending plate is arranged between the first outer bending plate and the second outer bending plate and is respectively connected to the first outer bending plate and the second outer bending plate.

[0013] The inner bending plate is respectively connected to the first outer bending plate and the second outer bending plate, so that the expansion force of the battery module is transmitted to the second outer bending plate through the first outer bending plate, the inner bending plate and the sub-cavity formed by the separation of the inner bending plate. In this way, the shape of the inner bending plate can change the internal structure of the bearing cavity by improving the structure of the inner bending plate, and then the force transmission path of the expansion force can be optimized by optimizing the structure of the inner bending plate, thereby improving the performance of the expansion beam in resisting the expansion force.

[0014] In some embodiments, the inner bending plate includes at least one connecting section extending from the first outer bending plate to the second outer bending plate. Both ends of the connecting section are respectively connected to the first outer bending plate and the second outer bending plate to separate the inner cavity of the bearing cavity.

[0015] The inner bending plate includes at least one connecting section, so that the expansion force can pass through the at least one connecting section and the separated inner cavity, and the transmission path is more distributed, thereby improving the reliability of the expansion beam.

[0016] In some embodiments, the connecting section is inclined relative to the first outer bending plate and the second outer bending plate. This arrangement divides the inner cavity of the bearing cavity 11 into multiple sub-cavities, further optimizes the transmission path of the expansion force, and improves the reliability of the expansion beam.

[0017] In some embodiments, the second outer bending plate includes a connecting portion connected to the inner bending plate, and the connecting portion is configured to be recessed toward one side of the inner cavity of the bearing cavity.

[0018] The connecting portion of the second outer bending plate is set to be concave inward, so that the expansion force is first transmitted to the connecting portion and then to other positions of the second outer bending plate, thereby optimizing the force transmission path. In addition, the connecting portion is set to be concave inward, so that the parts of the second outer bending plate located on the upper and lower sides of the connecting portion can be set to be convex outward, thereby improving the strength of the second outer bending plate.

[0019] In some embodiments, the second outer bending plate includes reinforcing ribs. The provision of the reinforcing ribs can improve the rigidity and compressive strength of the expansion beam.

[0020] In some embodiments, the reinforcing ribs include vertical reinforcing ribs extending in the height direction. After reaching the second outer bending plate, the expansion force extends downward to the box along the vertical reinforcing ribs extending in the height direction, thereby achieving effective transmission of the expansion force.

[0021] In some embodiments, the reinforcing rib is recessed toward the inner cavity of the bearing cavity. The reinforcing rib is formed as a recessed portion, which can further improve the compressive strength of the expansion beam.

[0022] In some embodiments, the second outer bending plate includes a plurality of reinforcing ribs arranged in the length direction of the expansion beam and a connecting portion connected to the inner bending plate. The connecting portion is connected to the inner bending plate by spot welding. In the length direction of the expansion beam, the spacing area of ​​the second outer bending plate between two adjacent reinforcing ribs is configured to be staggered with the welding point of the connecting portion and the inner bending plate.

[0023] The connecting portion is connected to the inner bending plate by spot welding. The second outer bending plate includes a plurality of reinforcing ribs that are recessed toward the inner cavity side of the bearing cavity. Such recessed reinforcing ribs may form a connecting portion spot-welded with the inner bending plate. The spacing area between two adjacent reinforcing ribs is relatively not recessed toward the inside, so the spacing area needs to be staggered with the welding point to avoid affecting the connection quality between the inner bending plate and the second outer bending plate.

[0024] In some embodiments, the second outer bending plate includes a plurality of reinforcing ribs arranged in the length direction of the expansion beam, and the plurality of reinforcing ribs are arranged symmetrically with respect to the center plane of the expansion beam, and the center plane is perpendicular to the length direction of the expansion beam. Such an arrangement makes the compressive strength of the expansion beam in the entire length direction more consistent and uniform, effectively improving reliability.

[0025] In some embodiments, a connecting fold is further included. The connecting fold is disposed on a side of the bearing cavity close to the battery module. By providing the connecting fold, the connecting fold is connected to the side wall of the box body, so that the expansion force is not only transmitted to the bottom wall of the box body through the bearing cavity, but also partially transmitted through the side wall, thereby dispersing the force on the box body and improving reliability.

[0026] In a second aspect, the present application provides a battery, including a battery box, a battery module and the above-mentioned expansion beam, wherein the expansion beam is connected to the box.

[0027] In a third aspect, the present application provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy.

[0028] 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

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0031] Figure 1 is a schematic diagram of the structure of a vehicle in some embodiments of the present application;

[0032] Figure 2 is a schematic diagram of the exploded structure of batteries in some embodiments of the present application;

[0033] Figure 3 It is a partial structural diagram of the battery box of some embodiments of the present application

[0034] Figure 4 is a schematic diagram of the three-dimensional structure of an expansion beam in some embodiments of the present application;

[0035] Figure 5 is a schematic side view of the expansion beam of some embodiments of the present application;

[0036] Figure 6 is a schematic structural diagram of a second outer bending plate of an expansion beam in some embodiments of the present application;

[0037] Figure 7 is a schematic diagram of topological optimization results of the second outer bending plate of the expansion beam in some embodiments of the present application;

[0038] In the drawings, the drawings are not drawn to scale.

[0039] Marking Description:

[0040] Vehicles 1000;

[0041] Battery 100;

[0042] Controller 200;

[0043] Motor 300;

[0044] Box body 2; first part 21; second part 22;

[0045] Battery module 3;

[0046] Expansion beam 1;

[0047] The bearing cavity 11, the first outer bending plate 111, the first main body section 1111, the first splicing section 1112, the first segment 1113, the second outer bending plate 112, the second main body section 1121, the second splicing section 1122, the second segment 1123, the reinforcing rib 1124, the vertical reinforcing rib 1124a, the connecting portion 112a, the inner bending plate 113, the first connecting segment 1131, the second connecting segment 1132; the third connecting segment 1133;

[0048] Connecting folded edge 12;

[0049] Expansion force F;

[0050] Gap Q;

[0051] First direction X; second direction Y; height direction Z. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. 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.

[0056] 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).

[0057] 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.

[0058] 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.

[0059] In order to resist the expansion force of the battery module, a strong force transmission structure needs to be provided in the battery box to withstand the expansion force and avoid deformation of the battery.

[0060] In the related art, a profile expansion beam is generally used to form a force transmission mechanism. The profile expansion beam is made of a profile, and the structure, shape and size of the profile are fixed. Therefore, the cross-sectional shape and size of the profile expansion beam made of the profile are fixed, and it is not easy to be applied to different battery modules. Therefore, the profile expansion beam in the related art has the problem of low applicability.

[0061] Secondly, the cost of the profile expansion beam is high. In addition, the profile expansion beam cannot be connected to the battery box by welding methods such as spot welding and arc welding, but needs to be set on the box and connected to the sheet metal beam by riveting, which further causes high costs.

[0062] In response to the above problems, an embodiment of the present application provides a battery box, which includes an expansion beam, and the bearing cavity of the expansion beam is formed by splicing bending plates. In this way, the cross-sectional structure of the bearing cavity can be adjusted by adjusting the bending structure of the bending plate, so that the expansion beam is suitable for different battery modules, thereby improving the applicability of the battery box. Moreover, the expansion beam of the embodiment of the present application includes a first outer bending plate and a second outer bending plate that form the outer contour of the bearing cavity, and the distance between the first outer bending plate and the second outer bending plate can be adjusted, so that the distance between the first outer bending plate and the second outer bending plate can be adjusted according to different battery modules, thereby further improving the applicability of the battery box.

[0063] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device.

[0064] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] 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.

[0066] Please refer to Figure 1 , Figure 1 A 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating or driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery 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.

[0068] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a case 2 and a battery module 3. The battery module 3 is accommodated in the case 2. Among them, the case 2 is used to provide a storage space for the battery module 3, and the case 2 can adopt a variety of structures. In some embodiments, the case 2 may include a first part 21 and a second part 22, the first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a storage space for accommodating the battery module 3. The second part 22 may be a hollow structure with one end open, the first part 21 may be a plate-like structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a storage space. The first part 21 and the second part 22 may also be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22. Of course, the case 2 formed by the first part 21 and the second part 22 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0069] In the battery 100, the battery module 3 includes a plurality of battery cells arranged side by side. The plurality of battery cells can be connected in series, in parallel or in mixed connection. Mixed connection means that the plurality of battery cells are connected in series and in parallel. The plurality of battery cells can be directly connected in series, in parallel or in mixed connection to form a battery module 3. The battery module 3 is then accommodated in the box 2. The battery module 3 may also include other structures. For example, the battery module 3 may also include a busbar component for realizing electrical connection between the plurality of battery cells.

[0070] Each battery cell may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell may be flat, rectangular, or in other shapes.

[0071] The battery box provided in the embodiment of the present application includes a box body 2 and an expansion beam 1, and the expansion beam 1 is arranged in the box body 2 to resist the expansion force of the battery module 3. In some embodiments, the battery box includes a box body 2 and at least two expansion beams 1 arranged at intervals in the box body 2. A receiving cavity for accommodating the battery module 3 is formed between two adjacent expansion beams 1. In this way, when the battery module 3 expands, the expansion force acts on the expansion beam 1 and is transmitted to the box body 2, thereby effectively improving the battery's ability to resist deformation.

[0072] In some embodiments, Figure 3 As shown, the expansion beam 1 is connected to the second portion 22 (lower box) of the box 2. The expansion force F can be transmitted to the box 2 through the expansion beam 1.

[0073] refer to Figures 3 to 5The present application proposes a battery box including a box 2 and an expansion beam 1, wherein the expansion beam 1 includes a bearing cavity 11. The bearing cavity 11 includes an outer bending plate arranged on the circumferential outer side and an inner bending plate 113 connected to the outer bending plate to separate the inner cavity of the bearing cavity 11. The outer bending plate includes a first outer bending plate 111 and a second outer bending plate 112, the first outer bending plate 111 and the second outer bending plate 112 are spliced ​​to form the outer contour of the bearing cavity 11, and the distance between the first outer bending plate 111 and the second outer bending plate 112 can be adjusted.

[0074] like Figure 4 and Figure 5 As shown, the outer bending plate forms the outer contour of the bearing cavity 11. The inner bending plate 113 is disposed in the inner cavity of the bearing cavity 11 and separates the inner cavity of the bearing cavity 11. The outer bending plate and / or the inner bending plate include sheet metal parts.

[0075] The bearing cavity 11 of the expansion beam 1 of the battery box of the embodiment of the present application is formed by splicing an outer bending plate and an inner bending plate 113. Therefore, the cross-sectional structure of the bearing cavity 11 can be adjusted by adjusting the bending structure of the outer bending plate and the bending structure of the inner bending plate 113 to adapt to different battery modules. For example, the cross-sectional height of the bearing cavity 11 can be changed to adapt to different module heights, thereby improving the applicability of the expansion beam. In addition, the expansion beam 1 of the embodiment of the present application includes a first outer bending plate 111 and a second outer bending plate 112 that form the outer contour of the bearing cavity. The distance between the first outer bending plate 111 and the second outer bending plate 112 can be adjusted, and the distance between the first outer bending plate 111 and the second outer bending plate 112 can be adjusted according to different battery modules, thereby further improving the applicability of the battery box.

[0076] refer to Figure 5 In some embodiments, the outer bending plate includes a first outer bending plate 111 and a second outer bending plate 112. The first outer bending plate 111 and the second outer bending plate 112 are spliced ​​to form the outer contour of the bearing cavity. The first outer bending plate 111 and the second outer bending plate 112 are spliced ​​to form the outer contour of the bearing cavity 11. In this way, the cross-sectional shape and size of the bearing cavity 1 can be adjusted by adjusting the shape or size of at least one of the first outer bending plate 111 and the second outer bending plate 112, thereby improving the applicability flexibility of the expansion beam. Moreover, the bearing cavity 1 is spliced ​​by the first outer bending plate 111 and the second outer bending plate 112, so that the structure can be adaptively changed and processed according to the different positions of the first outer bending plate 111 and the second outer bending plate 112, further improving the performance of the bearing cavity 11. For example, the second outer bending plate 112 is located on the side away from the battery module 3. In order to prevent the expansion beam 1 from tipping over, the second outer bending plate 112 includes an inclined section. The inclined section is inclined relative to the height direction Z.

[0077] Moreover, the inner cavity of the bearing cavity 11 of the expansion beam in the embodiment of the present application is separated by the inner bending plate 113. Therefore, the internal structure of the bearing cavity 11 can be changed by improving the structure of the inner bending plate 113, thereby optimizing the force transmission path of the expansion force and improving the performance of the expansion beam 1 in resisting the expansion force.

[0078] In some embodiments, the first outer bending plate 111 includes a first splicing section 1112 spliced ​​with the second outer bending plate 112. The second outer bending plate 112 includes a second splicing section 1122 spliced ​​with the first outer bending plate 111. The first splicing section 1112 and the second splicing section 1122 overlap, and the overlapping length of the first splicing section 1112 and the second splicing section 1122 can be adjusted.

[0079] refer to Figure 5 The first splicing section 1112 and the second splicing section 1122 are overlapped, that is, the first splicing section 1112 and the second splicing section 1122 have overlapping sections, and at least parts of the first splicing section 1112 and the second splicing section 1122 are overlapped in the thickness direction. The overlapping length of the first splicing section 1112 and the second splicing section 1122 is adjustable, so that the overlapping length can be adjusted according to different battery modules to make the expansion beam suitable for different battery modules, the adjustment is simple, and the application range is wider.

[0080] refer to Figure 5 In some embodiments, the first outer bending plate 111 further includes a first main section 1111 extending in the height direction and a first segment 1113 arranged opposite to the first splicing section 1112. The first segment 1113 and the first splicing section 1112 are respectively arranged at two ends of the first main section 1111. The first segment 1113 is connected to the box body 2, and a gap Q is formed between the first segment 1113 and the second outer bending plate 112.

[0081] When installing the expansion beam, first connect the first outer bending plate 111 to the box body 2, and then connect the second outer bending plate 112 to the first outer bending plate 111. Setting a gap Q between the first segment 1113 and the second outer bending plate 112 can avoid interference between the first outer bending plate 111 and the second outer bending plate 112.

[0082] exist Figure 5 In the illustrated embodiment, the inner bending plate 113 extends downward to the position where the first segment 113 is disposed. Figure 5 In the illustrated embodiment, a gap Q is provided between the first segment 113 and the inner bending plate 113 to avoid positional interference between the first outer bending plate 111 and the inner bending plate 113 .

[0083] In some embodiments, the first outer bending plate 111 is arranged close to the battery module 3, the second outer bending plate 112 is arranged away from the battery module 3, and the second outer bending plate 112 is configured to be inclined. The inclined arrangement of the second outer bending plate 112 refers to the second outer bending plate 112 being inclined relative to the height direction Z. Specifically, the middle portion of the second outer bending plate 112 is closer to the first outer bending plate 111 than the bottom portion of the second outer bending plate 112. Such an arrangement can prevent the expansion beam 1 from tipping over under the action of the expansion force.

[0084] like Figure 5 As shown, in a specific embodiment, the cross-sectional shape of the first outer bending plate 111 is a groove-shaped structure, that is, the first outer bending plate 111 includes a first main body section 1111 arranged close to the battery module and a first splicing section 1112 and a first segment 1113 arranged at both ends of the first main body section 1111. Among them, the first splicing section 1112 and the first segment 1113 are both perpendicular to the first main body section 1111 and arranged on the same side of the first main body section 1111, and the same side mentioned here refers to the side of the first main body section 1111 away from the battery module. The first splicing section 1112 is connected to the second outer bending plate 112. The first main body section 1111, the first splicing section 1112 and the first segment 1113 are all planar sections.

[0085] like Figure 5 As shown, the second outer bending plate 112 includes a second main body section 1121 arranged opposite to the first main body section 1111 of the first outer bending plate 111, and a second splicing section 1122 and a second segment 1123 arranged at both ends of the second main body section 1121. The second splicing section 1122 and the second segment 1123 are respectively arranged on different sides of the second main body section 1121. Figure 5 As shown, the second splicing section 1122 is arranged on the left side of the second main section 1121, and the second segment 1123 is arranged on the right side of the second main section 1121. The second splicing section 1122 is connected to the first outer bending plate 111. The second segment 1123 extends in a direction away from the first outer bending plate 111. When the expansion beam 1 is installed on the box body 2 of the battery, the second segment 1123 and the box body 2 can be connected to the box body 2 by welding, which reduces the cost compared with riveting in the related art.

[0086] Moreover, the second segment 1123 is not connected to the first segment 1113, and there is a gap Q between the first segment 1113 and the second segment 1123, thereby avoiding position interference during installation.

[0087] In some embodiments, the second splicing section 1122 and the second section 1123 of the second outer bending plate 112 are both planar sections. The second main section 1121 is a non-planar section.

[0088] refer to Figure 3 and Figure 5 , the first outer bending plate 111 is arranged close to the battery module 3. The second outer bending plate 112 is arranged away from the battery module 3. The inner bending plate 113 is arranged between the first outer bending plate 111 and the second outer bending plate 112 and is respectively connected to the first outer bending plate 111 and the second outer bending plate 112. The inner bending plate 113 is respectively connected to the first outer bending plate 111 and the second outer bending plate 112, so that the expansion force of the battery module is transmitted to the second outer bending plate 112 through the first outer bending plate 111, the inner bending plate 113 and the sub-cavity formed by the separation of the inner bending plate, so that the shape of the inner bending plate 113 can change the internal structure of the bearing cavity 11 by improving the structure of the inner bending plate 113, and then the force transmission path of the expansion force can be optimized by optimizing the structure of the inner bending plate 113, thereby improving the performance of the expansion beam 1 in resisting the expansion force.

[0089] In some embodiments, the inner bending plate 113 includes at least one connecting section extending from the first outer bending plate 111 to the second outer bending plate 112. Both ends of the connecting section are respectively connected to the first outer bending plate 111 and the second outer bending plate 112 to separate the inner cavity of the bearing cavity 11. The inner bending plate 113 includes at least one connecting section, so that the expansion force can be transmitted through at least one connecting section and the separated inner cavity, and the transmission path is more distributed, thereby improving the reliability of the expansion beam.

[0090] refer to Figure 5 In some embodiments, the connecting section is inclined relative to the first outer bending plate 111 and the second outer bending plate 112. Figure 5 As shown, at least one connecting section includes a first connecting section 1131, a second connecting section 1132 and a third connecting section 1133. The first connecting section 1131, the second connecting section 1132 and the third connecting section 1133 are all arranged obliquely. In this way, the inner cavity of the bearing cavity 11 is divided into a plurality of sub-cavities, which further optimizes the transmission path of the expansion force and improves the reliability of the expansion beam.

[0091] In some embodiments, the second outer bending plate 112 includes a connecting portion 112a connected to the inner bending plate 113. The connecting portion 112a is configured to be recessed toward one side of the inner cavity of the bearing cavity 11. The connecting portion 112a of the second outer bending plate 112 is set to be recessed inwardly, so that the expansion force is first transmitted to the connecting portion 112a, and then transmitted to other positions of the second outer bending plate 112, thereby optimizing the force transmission path. Moreover, the connecting portion 112a is set to be recessed inwardly, so that the parts of the second outer bending plate 112 located on the upper and lower sides of the connecting portion 112a can be set to convex outwardly, thereby improving the strength of the second outer bending plate 112.

[0092] In some embodiments, in order to improve the rigidity and compressive strength of the expansion beam 1 , the second outer bending plate 112 includes a reinforcing rib 1124 .

[0093] In some embodiments, the second outer bending plate 112 includes a vertical reinforcing rib 1124a extending in the height direction Z. After reaching the second outer bending plate 112, the expansion force extends downward to the box body 2 along the vertical reinforcing rib 1124a extending in the height direction, thereby achieving effective transmission of the expansion force.

[0094] In some embodiments, Figure 6 and Figure 7 As shown, the reinforcement rib 1124 is configured to be obtained according to topological optimization. Figure 7 The figure shows the force result of the topological optimization of the second outer bending plate 112. The black area is the part of the second outer bending plate 112 that is subjected to greater force. Figure 6 As shown, reinforcing ribs are provided in the corresponding black areas of the second outer bending plate 112 to improve the rigidity of the second outer bending plate 112 .

[0095] In some embodiments, the reinforcing rib 1124 is recessed toward one side of the inner cavity of the bearing cavity 11. The reinforcing rib 1124 is formed as a recessed portion, which can further improve the compressive strength of the expansion beam.

[0096] In some embodiments, the second outer bending plate 112 includes a plurality of reinforcing ribs 1124 arranged in the length direction of the expansion beam 1 and a connecting portion 112a connected to the inner bending plate 113. The connecting portion 112a is connected to the inner bending plate 113 by spot welding. In the length direction of the expansion beam 1, the interval area of ​​the second outer bending plate 112 between two adjacent reinforcing ribs 1124 is configured to be staggered with the welding point between the connecting portion 112 and the inner bending plate 113.

[0097] The connecting portion 112a is connected to the inner bending plate 113 by spot welding. The second outer bending plate 112 includes a plurality of reinforcing ribs 1124 that are recessed toward the inner cavity side of the bearing cavity 11. Such recessed reinforcing ribs 1124 may form a connection portion that is spot welded with the inner bending plate 113. The spacing area between two adjacent reinforcing ribs 1124 is relatively not recessed toward the inside, so the spacing area needs to be staggered with the welding point to avoid affecting the connection quality between the inner bending plate 113 and the second outer bending plate 112.

[0098] The second outer bending plate 112 includes a plurality of reinforcing ribs 1124 arranged in the length direction of the expansion beam 1. The plurality of reinforcing ribs 1124 are arranged symmetrically with respect to the center plane of the expansion beam 1, and the center plane is perpendicular to the length direction X of the expansion beam 1. Such an arrangement makes the compressive strength of the expansion beam in the entire length direction more consistent and uniform, and effectively improves reliability.

[0099] In some embodiments, the expansion beam 1 further includes a connecting fold 12. The connecting fold 12 is disposed on a side of the bearing cavity 11 close to the battery module. The connecting fold 12 is configured to be connected to the side wall of the box body 2. By providing the connecting fold 12, the connecting fold 12 is connected to the side wall of the box body 2, so that the expansion force is not only transmitted to the bottom wall of the box body 2 through the bearing cavity 11, but also partially transmitted through the side wall, thereby dispersing the force on the box body 2 and improving reliability.

[0100] like Figure 3 As shown, an embodiment of the present application provides a battery, including a battery box, a battery module and an expansion beam 1, wherein the expansion beam 1 is connected to a box body 2.

[0101] In some embodiments, the expansion beam 1 is welded to the box body 2 .

[0102] The embodiment of the present application further provides an electrical device, including a battery. The battery is used to provide electrical energy.

[0103] According to the following Figures 3 to 7 The structure of a battery box and a battery in a specific embodiment of the present application is described in detail.

[0104] like Figures 3 to 5 As shown, the battery box of this embodiment includes a box body 2 and an expansion beam 1. The expansion beam 1 includes a bearing cavity 11 and a connecting fold 12. The expansion beam 1 extends along a first direction X. That is, the length direction of the expansion beam 1 is the first direction X. The connecting fold 12 is arranged on one side of the second direction Y of the bearing cavity 11. The second direction Y is perpendicular to the first direction X. And the second direction Y is perpendicular to the large surface of the battery cell of the battery module. Figure 3 As shown, the bearing cavity 11 of the expansion beam 1 is welded to the bottom wall of the box body 2. The connecting folded edge 12 is welded to the side wall of the box body 2.

[0105] like Figure 5 As shown, the bearing cavity 11 includes a first outer bending plate 111, a second outer bending plate 112 and an inner bending plate 113. The first outer bending plate 111 and the second outer bending plate 112 are connected to form the outer contour of the bearing cavity 11. The inner bending plate 113 is arranged on the inner side of the bearing cavity 11 to divide the inner cavity of the bearing cavity 11 into a plurality of sub-cavities. The bottom of the first outer bending plate 111 and the bottom of the second outer bending plate 112 are connected to the bottom wall of the box body 2. In this way, the expansion force F is transmitted to the second outer bending plate 112 and to the bottom wall of the box body 2 through the first outer bending plate 111, the inner bending plate 113 and the plurality of sub-cavities.

[0106] like Figure 5 As shown, the inner bending plate 113 includes a first connecting section 1131, a second connecting section 1132 and a third connecting section 1133. The inner bending plate 113 divides the inner cavity of the bearing cavity 11 into a plurality of sub-cavities.

[0107] Iru Figure 5 As shown, the inner bending plate 113 also includes a first intermediate connecting section arranged between the first connecting section 1131 and the second connecting section 1132, and a second intermediate connecting section arranged between the second connecting section 1132 and the third connecting section 1133. The first intermediate connecting section is connected to the second outer bending plate 112. The second intermediate connecting section is connected to the first outer bending plate 111. The first end of the third connecting section 1133 is connected to the first outer bending plate 111 through the second intermediate connecting section, and the second end of the third connecting section 1133 is connected to the second segment 1123 of the second outer bending plate 112.

[0108] The second outer bending plate 112 includes a connecting portion 112a connected to the inner bending plate 113. The connecting portion 112a is recessed toward one side of the first outer bending plate 111.

[0109] In order to optimize the force of the second outer bending plate 112, as Figure 6 and Figure 7 As shown, the second outer bending plate 112 is provided with reinforcing ribs 112A. The distribution of the reinforcing ribs 112A is based on Figure 7 Shown are the results obtained from the topology optimization.

[0110] In this embodiment, the outer bending plate and / or the inner bending plate comprises sheet metal parts. The sheet metal parts are spliced ​​to form the bearing cavity, thereby reducing the cost of the expansion beam.

[0111] The installation process of the expansion beam of this embodiment is as follows: first connect (for example, weld) the first outer bending plate 111 to the box body 2, specifically, connect the first segment 1113 of the first outer bending plate 111 to the box body 2, connect (for example, weld) the inner bending plate 113 and the second outer bending plate 112 to form an integrated structure, then connect the first splicing segment 1112 of the first outer bending plate 111 to the second splicing segment 1122 of the second outer bending plate 112, and weld the second segment 1123 of the second outer bending plate 112 to the box body. It can be seen from the above process that setting a gap Q between the first segment 1113 and the inner bending plate 113 can avoid interference during the installation process.

[0112] like Figure 3 As shown, the expansion force of the battery module is first transmitted to the first outer bending plate 111 , and then passes through the inner bending plate 113 and a plurality of sub-cavities to transmit the expansion force to the bottom of the box body 2 .

[0113] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery box, comprising a box body (2) and an expansion beam (1) arranged in the box body (2), the expansion beam (1) comprising a bearing cavity (11), the bearing cavity (11) comprising an outer bending plate (111, 112) arranged on the circumferential outer side and an inner bending plate (113) connected to the outer bending plate (111, 112) to separate the inner cavity of the bearing cavity (11), the outer bending plate comprising a first outer bending plate (111) and a second outer bending plate (112), the first outer bending plate (111) and the second outer bending plate (112) being spliced ​​to form the outer contour of the bearing cavity (11), and the distance between the first outer bending plate (111) and the second outer bending plate (112) being adjustable.

2. The battery box according to claim 1, wherein: The first outer bending plate (111) includes a first splicing section (1112) spliced ​​with the second outer bending plate (112), and the second outer bending plate (112) includes a second splicing section (1122) spliced ​​with the first outer bending plate (111), the first splicing section (1112) and the second splicing section (1122) are overlapped, and the overlap length of the first splicing section (1112) and the second splicing section (1122) can be adjusted.

3. The battery box according to claim 2, wherein: The first outer bending plate (111) further comprises a first main section (1111) extending in the height direction and a first segment (1113) arranged opposite to the first splicing section (1112); the first segment (1113) and the first splicing section (1112) are respectively arranged at two ends of the first main section (1111); the first segment (113) is connected to the box body (2); and a gap (Q) is formed between the first segment (1113) and the second outer bending plate (112).

4. The battery box according to claim 1, wherein: The first outer bending plate (111) is arranged close to the battery module (3), the second outer bending plate (112) is arranged away from the battery module (3), and the second outer bending plate (112) is arranged obliquely.

5. The battery box according to claim 1, wherein: The first outer bending plate (111) is arranged close to the battery module, the second outer bending plate (112) is arranged away from the battery module, and the inner bending plate (113) is arranged between the first outer bending plate (111) and the second outer bending plate (112) and is respectively connected to the first outer bending plate (111) and the second outer bending plate (112).

6. The battery box according to claim 5, wherein: The inner bending plate (113) comprises at least one connecting section extending from the first outer bending plate (111) to the second outer bending plate (112), and two ends of the connecting section are respectively connected to the first outer bending plate (111) and the second outer bending plate (112) to separate the inner cavity of the bearing cavity (11).

7. The battery box according to claim 6, wherein: The connecting section is arranged obliquely relative to both the first outer bending plate (111) and the second outer bending plate (112).

8. The battery box according to any one of claims 5 to 7, wherein: The second outer bending plate (112) comprises a connecting portion (112a) connected to the inner bending plate (113), and the connecting portion (112a) is configured to be recessed toward one side of the inner cavity of the bearing cavity (11).

9. The battery box according to any one of claims 1 to 8, wherein: The second outer bent plate (112) includes a reinforcing rib (1124).

10. The battery box according to claim 9, wherein: The reinforcing ribs (1124) include vertical reinforcing ribs (1124a) extending in the height direction.

11. The battery box according to claim 10, wherein: The reinforcing rib (1124) is recessed toward one side of the inner cavity of the bearing cavity (11).

12. The battery box according to claim 11, wherein: The second outer bending plate (112) comprises a plurality of reinforcing ribs (1124) arranged in the length direction of the expansion beam (1) and a connecting portion (112a) connected to the inner bending plate (113); the connecting portion (112a) and the inner bending plate (113) are connected by spot welding; in the length direction of the expansion beam (1), the spacing area of ​​the second outer bending plate (112) between two adjacent reinforcing ribs (1124) is configured to be staggered with the welding point between the connecting portion (112a) and the inner bending plate (113).

13. The battery box according to claim 9, wherein: The second outer bending plate (112) includes a plurality of reinforcing ribs (1124) arranged in the length direction of the expansion beam (1), and the plurality of reinforcing ribs (1124) are symmetrically arranged relative to the center plane of the expansion beam (1), and the center plane is perpendicular to the length direction of the expansion beam (1).

14. The battery box according to any one of claims 1 to 13, further comprising a connecting folded edge (12), wherein the connecting folded edge (12) is arranged on a side of the carrying cavity (11) close to the battery module.

15. A battery, comprising a battery box, a battery module and an expansion beam (1) according to any one of claims 1 to 14, wherein the expansion beam (1) is connected to the box body (2).

16. An electrical device comprising the battery according to claim 15, wherein the battery is used to provide electrical energy.

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