Battery case, battery and electrical device

Abstract

Provided in the present application are a battery case, a battery and an electrical device. The battery case is used for accommodating a battery. The battery comprises a plurality of battery cells and a connector for electrically connecting the battery cells. The battery case comprises a plurality of side beams which are connected end to end and enclose to form an accommodating cavity. At least one side beam has a recessed portion formed on the side surface facing the accommodating cavity by being recessed away from the side of the accommodating cavity. Thus, when the plurality of battery cells are electrically connected by means of the connector, the connector can at least partially pass through the inside of the recessed portion, such that, by means of the recessed portion, a rate of space utilization in the battery case is improved, the arrangement of the connector is achieved, and the impact of an increase in the size of the side beams on the internal structure of the battery is thereby reduced, improving the battery performance.

Description

Battery box, battery and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420614516.4, filed on March 28, 2024, entitled “Battery Case, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of battery technology, and in particular relates to a battery box, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] Currently, the main methods for processing side beams in battery boxes are punching, welding, and rolling. Due to the limitations of the manufacturing process, the processed side beams are relatively large. For the same envelope width, they occupy internal space in the battery and affect the internal structure of the battery. Therefore, how to improve the utilization of the internal space of the battery box has become an urgent problem to be solved.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery box, a battery and an electrical device, which can improve the internal space utilization of the battery box, reduce the impact of the increase in side beam size on the internal structure of the battery, and improve battery performance.

[0008] In a first aspect, the present application provides a battery case for accommodating a battery, wherein the battery includes a plurality of battery cells and connectors electrically connecting the battery cells. The battery case includes a plurality of side beams connected end to end and enclosing a accommodating cavity. A surface of at least one side beam facing the accommodating cavity is recessed toward the side away from the accommodating cavity to form a recess, and the recess is used to accommodate at least a portion of the connector.

[0009] In an embodiment of the present application, a recess is formed on the side of the side beam facing away from the accommodating cavity, and the recess can at least partially accommodate the battery connector, thereby improving the internal space utilization of the battery box and realizing the arrangement of multiple battery cells and connectors.

[0010] In some embodiments, the side beam has a first surface and a second surface disposed opposite each other along a first direction, and the battery case further includes a bottom plate, which overlaps at least partially with the second surface and closes a side opening of the accommodating cavity along the first direction, where the first direction intersects the concave direction of the recess. In other words, the bottom plate and the side beam are fixed as a single unit to define a mounting area for the battery cells.

[0011] In some embodiments, the recess is located between the first and second surfaces along the first direction and spaced apart from the first surface. Therefore, when a connector is inserted into the recess, the recess can surround the connector, improving the connector's reliability. Furthermore, the recess does not affect the first surface of the side beam, thereby preventing it from interfering with the connection between the side beam and other structures within the battery, thereby improving the battery case's usability.

[0012] In some embodiments, the side beam is a roll-formed integral structure, and the side beam includes a base body enclosing a hollow cavity, and the base body is partially recessed into the hollow cavity to form a recess.

[0013] In the embodiment of the present application, the side beam can be constructed as a rolled part. By bending the rolled part into the hollow cavity to form a recessed portion, the rolling process is simple, and the side beam is a hollow structure, which reduces weight.

[0014] In some embodiments, the side beam also includes a support portion integrally provided with the base, and the two ends of the base are connected on one side surface along the recessed direction. The support portion is connected to at least one end of the base and extends into the hollow cavity to abut against the other side surface of the base along the recessed direction to improve the structural strength of the side beam.

[0015] In some embodiments, the support portion separates the substrate into a first region and a second region arranged opposite to each other along the first direction, the second region is located on a side close to the bottom plate, and within the second region, the cross-sectional area of ​​the substrate in the first direction gradually increases along the direction close to the bottom plate.

[0016] In the embodiment of the present application, by gradually increasing the cross-sectional area of ​​the base in the first direction in the second region, on the one hand, the area of ​​the second surface of the base can be made larger than the area of ​​the first surface, thereby increasing the bottom width of the side beam and making it easier to connect the side beam with the bottom plate. On the other hand, the center of gravity of the side beam can be lowered to increase the anti-tilting ability of the side beam, and the stiffness of the side beam can also be increased, thereby improving the reliability of the battery box.

[0017] In some embodiments, in the first direction, the size ratio a of the first area and the second area satisfies: 1≤a≤2, so as to further lower the center of gravity of the side beam, increase the anti-dumping ability of the side beam, and improve the reliability of the battery box.

[0018] In some embodiments, in the second region, a side surface of the base body facing the accommodating cavity is at least partially inclined, that is, a diagonal bracing structure is formed at the bottom of the side beam, so that the cross-sectional area of ​​the base body in the first direction gradually increases, thereby simplifying the structure of the base body and making it easier to roll-form the side beam.

[0019] In some embodiments, the angle α between the side surface of the base facing the accommodating cavity and the second surface satisfies: 80°≤α<90°, so that the bottom width of the side beam can be reasonably controlled to improve the stiffness and anti-tilting ability of the side beam while reducing the space occupied by the side beam in the battery box.

[0020] In some embodiments, the second surface includes a first sub-surface and a second sub-surface. Along the recessed direction, the first sub-surface is located on the side of the second sub-surface away from the accommodating cavity. The battery box also includes a mounting beam, at least part of which is connected to the first sub-surface, and the bottom plate is connected to the second sub-surface.

[0021] In the embodiment of the present application, since the cross-sectional area of ​​the base in the first direction in the second region gradually increases, the area of ​​the second surface of the side beam is increased. Therefore, in addition to connecting the bottom plate to the second surface of the side beam, the mounting beam can also be connected to the second surface of the side beam, thereby realizing the bottom support connection of the mounting beam and improving the fixing stiffness of the battery box.

[0022] In some embodiments, the battery box further includes a sealing portion, which fills the gap between the mounting beam and the bottom plate to improve the sealing of the battery box and enhance the waterproof and dustproof effects.

[0023] In some embodiments, in the first direction, the distance between the first sub-surface and the first surface is smaller than the distance between the second sub-surface and the first surface, that is, a step structure is formed between the first sub-surface and the second sub-surface, which makes it easier to connect and position the mounting beam and the base plate, and also makes it easier to coat the sealing part, reducing manufacturing difficulty.

[0024] In a second aspect, an embodiment of the present application provides a battery, comprising a battery case, battery cells and a connector according to the first aspect, wherein a plurality of battery cells are arranged in a receiving cavity, and at least a portion of the connector is received in a recess of the battery case and electrically connected to the plurality of battery cells.

[0025] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in a second direction, the battery being used to provide electrical energy.

[0026] According to the battery case, battery and electrical device of the embodiment of the present application, the battery case includes a plurality of side beams connected end to end and enclosing a accommodating cavity, the accommodating cavity is used to accommodate battery cells, and at least one side surface of the side beam facing the accommodating cavity is recessed toward the side away from the accommodating cavity to form a recess, so that when multiple battery cells are electrically connected through a connector, the connector can be at least partially inserted into the recess, so as to improve the internal space utilization of the battery case through the recess, thereby realizing the setting of the connector, thereby reducing the impact of the increase in the size of the side beam on the internal structure of the battery, and improving battery performance.

[0027] 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

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 creative work.

[0029] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0030] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0031] FIG3 is a schematic structural diagram of a battery cell housed in a battery box according to some embodiments of the present application;

[0032] FIG4 is a top view of a battery cell housed in a battery box according to some embodiments of the present application;

[0033] FIG5 is a cross-sectional view of FIG4 at AA;

[0034] FIG6 is an enlarged view of point B in FIG5.

[0035] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0036] Marking Description:

[0037] 100 batteries, 200 controllers, 300 motors;

[0038] 10 battery boxes, 20 battery cells, 30 connectors;

[0039] 1 side beam, 11 base, 12 support portion, 111 recess, 2 bottom plate, 3 mounting beam, 4 sealing portion;

[0040] S1 first surface, S2 second surface, S21 first sub-surface, S22 second sub-surface;

[0041] X first direction. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0044] 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. They 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0045] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0047] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] With the advancement of technology, power batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0049] The performance of power batteries can have a significant impact on the performance of electric vehicles, making their manufacturing process particularly important. Regarding the battery case, the side beams of the battery case are typically manufactured using methods such as punching and welding, tailored welding, and roll-forming. Roll-forming, in particular, allows for adjustable side beam dimensions simply by adjusting cutting and bending control parameters, effectively meeting the design requirements for power battery layout in different vehicle models.

[0050] However, the edge R angle of the side beam manufactured by the rolling process is relatively large. In order to ensure the overall sealing and tightness of the side beam, the width of the side beam is relatively wide, resulting in more internal space of the battery being occupied under the same envelope width, affecting the arrangement of the battery cells and their connectors inside the battery.

[0051] Based on the above considerations, the present embodiment provides a recessed portion on the side beam. When the battery cells are connected via a connector, the connector can be at least partially embedded in the recessed portion, thereby achieving the configuration of the connector. The recessed portion can improve the internal space utilization of the battery box, thereby reducing the impact of the increased side beam width on the internal structure of the battery and improving battery performance.

[0052] To facilitate the description of the technical solution of the present application, the battery box, battery and electrical device in the embodiment of the present application are described in detail below with reference to Figures 1 to 6.

[0053] The present invention provides an electrical device including a battery, which can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, and the like. The battery is used to provide power to the electrical device, which can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like.

[0054] It should be understood that the technical solutions described in the embodiments of the present application are applicable to all electrical devices including batteries and using batteries, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0055] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle, and the battery 100 can be provided at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle. For example, the battery 100 can be used as an operating power source for the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0056] Please refer to FIG. 2 , which is an exploded view of a battery 100 provided in some embodiments of the present application.

[0057] The battery 100 in the embodiment of the present application includes a battery case 10 and a plurality of battery cells 20 accommodated in the battery case 10 .

[0058] The multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration via connectors 30. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery 100 is housed within the battery housing 10. Alternatively, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration to form a battery module 100. The multiple battery modules can then be connected in series, in parallel, or in a hybrid configuration via connectors 30 to form a single unit housed within the battery housing 10.

[0059] The connecting member 30 can be configured as a copper bar, an aluminum bar or a conductive member made of other materials.

[0060] Optionally, each battery cell 20 may be a secondary battery or a primary battery. A secondary battery refers to a battery cell 20 that can be continuously used by activating active materials by charging after the battery cell 20 is discharged.

[0061] The battery cells 20 include but are not limited to lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0062] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, but is not limited thereto. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries, such as hexagonal prismatic batteries.

[0063] The battery case 10 is used to provide a storage space for the battery cells 20 , and the battery case 10 can adopt various structures.

[0064] In some embodiments, the battery box 10 can serve as part of the chassis structure of the vehicle. For example, a portion of the battery box 10 can become at least a portion of the vehicle's floor, or a portion of the battery box 10 can become at least a portion of the vehicle's crossbeams and longitudinal beams.

[0065] In some embodiments, the battery case 10 may include an upper case and a lower case, which cover each other and together define a storage space for accommodating the battery cells 20. The lower case may be a hollow structure with one end open, and the upper case may be a plate-like structure, with the upper case covering the open side of the lower case, so that the upper and lower cases together define the storage space. The upper and lower cases may also be hollow structures with one end open, with the open side of the upper case covering the open side of the lower case. Of course, the battery case 10 formed by the upper and lower cases can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0066] Please refer to Figures 3 to 6 together. Figure 3 is a structural schematic diagram of the battery cell 20 provided in some embodiments of the present application accommodated in the battery case 10. Figure 4 is a top view of the battery cell 20 provided in some embodiments of the present application accommodated in the battery case 10. Figure 5 is a cross-sectional view at AA in Figure 4. Figure 6 is an enlarged view of B in Figure 5.

[0067] The battery box 10 in the embodiment of the present application includes a plurality of side beams 1 connected end to end and enclosing a accommodating cavity. A surface of at least one side beam 1 facing the accommodating cavity is recessed toward the side away from the accommodating cavity to form a recess 111, and the recess 111 is used to accommodate at least a portion of the connector 30.

[0068] The battery case 10 in the embodiment of the present application forms a recess 111 on the side surface of the side beam 1 facing the accommodating cavity, so that the internal space utilization rate of the battery case 10 can be improved through the recess 111. When a plurality of battery cells 20 are electrically connected through the connector 30, the connector 30 can be at least partially passed through the recess 111 to realize the setting of the connector 30, thereby reducing the impact of the increase in the size of the side beam 1 on the internal structure of the battery 100 and improving the performance of the battery 100.

[0069] It is understood that, depending on the specific structure of the battery 100, it may also include other components. Therefore, in addition to accommodating the connector 30, the recess 111 may also accommodate other components of the battery 100. Furthermore, the specific shape and size of the recess 111 can be adjusted according to the structure of the component to be accommodated, as long as it meets the accommodation requirements of the component to be accommodated. For ease of description, the following description will still use the accommodating connector 30 as an example.

[0070] Please refer to Figure 6. In some optional embodiments, the side beam 1 has a first surface S1 and a second surface S2 arranged opposite to each other along a first direction X. The battery box 10 also includes a bottom plate 2, which is overlapped with at least part of the second surface S2 and closes the opening of one side of the accommodating cavity along the first direction X. The first direction X intersects with the concave direction of the recess 111.

[0071] The bottom plate 2 is connected to the second surface S2 of the side beam 1 and closes the opening of the accommodating cavity along the first direction X, thereby defining a mounting area for the battery cells 20. The battery cells 20 are accommodated within the mounting area. The bottom plate 2 and the side beam 1 can be fixed together as a whole using resistance welding, gas shielded welding, or structural adhesive bonding, thereby improving the connection strength of the battery case 10.

[0072] Optionally, the battery box 10 further includes a water-cooling plate, which is arranged between the bottom plate 2 and the second surface S2 of the side beam 1 along the first direction X, thereby further improving the connection strength of the battery box 10.

[0073] It should be noted that the direction of the recess 111 is related to the location of the side beam 1. For example, the battery case 10 is a rectangular parallelepiped, and the battery case 10 includes first side beams disposed oppositely along the second direction and second side beams disposed oppositely along the third direction. When the recess 111 is disposed on the first side beam and / or the second side beam, the recess 111 of the first side beam is in the second direction, and the recess 111 of the second side beam is in the third direction. The first direction X, the second direction, and the third direction are perpendicular to each other.

[0074] With respect to the battery case 10 in the above embodiment, in some optional embodiments, the recess 111 is located between the first surface S1 and the second surface S2 along the first direction X and is spaced apart from the first surface S1 .

[0075] The recess 111 is spaced apart from the first surface S1, meaning that the recess 111 is provided only on the surface of the base 11 facing the accommodating cavity and does not extend onto the first surface S1. Therefore, when the connector 30 is inserted into the recess 111, the recess 111 can surround the connector 30, thereby improving the reliability of the connector 30. Furthermore, the recess 111 does not affect the first surface S1 of the side beam 1, thereby not affecting the connection between the side beam 1 and other structures within the battery 100, thereby improving the applicability of the battery case 10.

[0076] Please refer to FIG. 6 . In some embodiments of the present application, the side beam 1 is a roll-formed integral structure. The side beam 1 includes a base 11 enclosing a hollow cavity. The base 11 is partially recessed into the hollow cavity to form a recess 111 .

[0077] It is understood that the side beam 1 can be constructed as a rolled component, which can be configured as a plate-like structure. By adjusting the bending control parameters, the rolled component can be rolled to form a base body 11 having a hollow cavity. Furthermore, during the rolling process, the rolled component can be bent into the hollow cavity, so that the side of the base body 11 facing the accommodating cavity is partially recessed into the hollow cavity to form a recessed portion 111. The bending control parameters and other parameters can be adjusted according to the size of the connector 30 to meet the requirements of the recessed portion 111 for accommodating the connector 30.

[0078] In some optional embodiments, the side beam 1 also includes a support portion 12 integrally provided with the base 11, and the two ends of the base 11 are connected on one side surface along the recessed direction. The support portion 12 is connected to at least one end of the base 11 and extends into the hollow cavity to abut against the other side surface of the base 11 along the recessed direction.

[0079] That is, when the side beam 1 is roll-formed, the side beam 1 may include an integrally arranged base 11 and a support portion 12, wherein the support portion 12 extends from one side surface of the base 11 along the recessed direction into the hollow cavity and abuts against the other side surface of the base 11 along the recessed direction, so as to improve the structural strength of the side beam 1.

[0080] Optionally, the support portion 12 may be provided at both ends of the base 11, or only at one end. For example, if the support portion 12 is provided at only one end of the base 11, a first extension section may be provided at the other end of the base 11. By connecting the first extension section to the support portion 12, the structural strength of the side beam 1 is further enhanced. Alternatively, a second extension section may be provided at the end of the support portion 12 facing away from the base 11. By connecting the second extension section to the other side surface of the base along the recessed direction, the structural strength of the side beam 1 is further enhanced.

[0081] Furthermore, the support portion 12 separates the base 11 into a first area and a second area arranged opposite to each other along the first direction X, the second area is located on the side close to the bottom plate 2, and within the second area, along the direction close to the bottom plate 2, the cross-sectional area of ​​the base 11 in the first direction X gradually increases.

[0082] By gradually increasing the cross-sectional area of ​​the base 11 in the second region in the first direction X, on the one hand, the area of ​​the second surface S2 of the base 11 can be made larger than the area of ​​the first surface S1, thereby increasing the bottom width of the side beam 1 and making it easier to connect the side beam 1 to the bottom plate 2. On the other hand, the center of gravity of the side beam 1 can be lowered to increase the anti-tilting ability of the side beam 1, and the stiffness of the side beam 1 can also be increased, thereby improving the reliability of the battery box 10.

[0083] In some embodiments, in the second region, the base 11 is inclined toward one side surface of the accommodating cavity, that is, a diagonal bracing structure is formed at the bottom of the side beam 1, so that the cross-sectional area of ​​the base 11 in the first direction X gradually increases, thereby simplifying the structure of the base 11 and making it easier to roll-form the side beam 1.

[0084] Optionally, the recess 111 may be provided in the first region, and in the second region, the entire surface of the base 11 facing the accommodating cavity may be tilted to further simplify the structure of the base 11 .

[0085] In the battery case 10 of the embodiment of the present application, the range of the first area and the second area can be adjusted according to the position of the recess 111. For example, in the first direction X, the size ratio a of the first area and the size ratio of the second area satisfies: 1≤a≤2, so that the bottom width of the side beam 1 can be reasonably controlled to improve the stiffness and anti-dumping ability of the side beam 1 while reducing the occupation of the internal space of the battery case 10 by the side beam 1.

[0086] In addition, in addition to adjusting the range of the first area and the second area, the inclination angle of the diagonal support of the base 11 can also be adjusted. For example, in the second area, the angle α between the side surface of the base 11 facing the accommodating cavity and the second surface S2 satisfies: 80°≤α<90°, that is, when the side surface of the base 11 is inclined toward the accommodating cavity, the bottom width of the side beam 1 can be adjusted by adjusting the angle between the surface of the base 11 and the second surface S2.

[0087] Optionally, a=1 and α=85° can be set to achieve the structural design of the side beam 1 .

[0088] Please refer to Figure 6. In some optional embodiments, the second surface S2 includes a first sub-surface S21 and a second sub-surface S22. Along the recessed direction, the first sub-surface S21 is located on the side of the second sub-surface S22 away from the accommodating cavity. The battery box 10 also includes a mounting beam 3, which is at least partially connected to the first sub-surface S21, and the bottom plate 2 is connected to the second sub-surface S22.

[0089] Because the cross-sectional area of ​​the base 11 in the second region gradually increases in the first direction X, the area of ​​the second surface S2 of the side beam 1 is increased. Therefore, in addition to connecting the bottom plate 2 to the second surface S2 of the side beam 1, the mounting beam 3 can also be connected to the second surface S2 of the side beam 1, thereby achieving a bottom-supporting connection for the mounting beam 3 and improving the fixing rigidity of the battery box 10. Optionally, the mounting beam 3 can be welded to the first sub-surface S21 of the side beam 1.

[0090] Furthermore, the battery case 10 also includes a sealing portion 4, which fills the gap between the mounting beam 3 and the bottom plate 2. The sealing portion 4 can be configured as a sealant. When the battery 100 is installed in the vehicle, the sealant can be squeezed to flow and fill the gap between the battery case 10 and the vehicle, thereby improving the waterproof and dustproof effect.

[0091] In some optional embodiments, in the first direction X, the distance between the first sub-surface S21 and the first surface S1 is smaller than the distance between the second sub-surface S22 and the first surface S1.

[0092] That is, a stepped structure is formed between the first sub-surface S21 and the second sub-surface S22, making it easier to connect and position the mounting beam 3 and the bottom plate 2, and also easier to apply the sealing portion 4, reducing manufacturing difficulties. Furthermore, by making the distance between the first sub-surface S21 and the first surface S1 smaller than the distance between the second sub-surface S22 and the first surface S1, the bottom plate 2 can be connected to the vehicle when the battery 100 is installed in the vehicle. Therefore, sealing can be achieved by simply placing the sealing portion 4 between the mounting beam 3 and the bottom plate 2, making it easier to install the sealing portion 4 and reducing the overall height of the battery 100 and the vehicle after installation, meeting the requirements of various vehicle models.

[0093] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 box for a battery, the battery comprising a plurality of battery cells and connectors electrically connecting the battery cells, wherein: The battery box includes a plurality of side beams connected end to end and enclosing a accommodating cavity. At least one of the side beams has a surface facing the accommodating cavity that is recessed toward the side away from the accommodating cavity to form a recess, and the recess is used to accommodate at least part of the connecting piece.

2. The battery case according to claim 1, wherein: The side beam has a first surface and a second surface arranged opposite to each other along a first direction. The battery box also includes a bottom plate, which is arranged to overlap with at least part of the second surface and closes the side opening of the accommodating cavity along the first direction, and the first direction intersects with the concave direction of the recess.

3. The battery case according to claim 2, wherein: The recessed portion is located between the first surface and the second surface along the first direction and is spaced apart from the first surface.

4. The battery case according to claim 2, wherein: The side beam is a roll-formed integral structure, and the side beam includes a base body enclosing a hollow cavity, and the base body is partially recessed into the hollow cavity to form the recess.

5. The battery case according to claim 4, wherein: The side beam also includes a support portion integrally provided with the base, the two ends of the base being connected on one side surface thereof along the recessed direction, the support portion being connected to at least one end of the base and extending into the hollow cavity and abutting against the other side surface of the base along the recessed direction.

6. The battery case according to claim 5, wherein: The support portion divides the base into a first area and a second area that are opposite to each other along the first direction; The second region is located on a side close to the bottom plate, and within the second region, a cross-sectional area of ​​the substrate in the first direction gradually increases along a direction close to the bottom plate.

7. The battery case according to claim 6, wherein: In the first direction, a ratio a of a size of the first region to a size of the second region satisfies: 1≤a≤2.

8. The battery case according to claim 6, wherein: In the second region, a side surface of the base body facing the accommodating cavity is at least partially inclined.

9. The battery case according to claim 8, wherein: An included angle α between a side surface of the base body facing the accommodating cavity and the second surface satisfies the following: 80°≤α<90°.

10. The battery case according to any one of claims 2 to 9, wherein: The second surface includes a first sub-surface and a second sub-surface, and along the recessed direction, the first sub-surface is located on a side of the second sub-surface facing away from the accommodating cavity; The battery box further includes a mounting beam, at least a portion of which is connected to the first sub-surface, and the bottom plate is connected to the second sub-surface.

11. The battery case according to claim 10, wherein: The battery box further includes a sealing portion, which fills a gap between the mounting beam and the bottom plate.

12. The battery case according to claim 10, wherein: In the first direction, a distance between the first sub-surface and the first surface is smaller than a distance between the second sub-surface and the first surface.

13. A battery comprising a battery case, a battery cell and a connector according to any one of claims 1 to 12, wherein a plurality of the battery cells are arranged in the accommodating cavity, and at least a portion of the connector is accommodated in the recess of the battery case and electrically connected to the plurality of the battery cells.

14. An electrical device comprising the battery according to claim 13, wherein the battery is used to provide electrical energy.

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