Battery device, box and power-consuming device

Abstract

The present application relates to a battery device, a box and an electrical device, including a battery cell, a box and a fixing member; the box includes a box body, at least one limiting beam and at least one sealing plate; the battery cell and each limiting beam are arranged in the box body, each limiting beam extends along a first direction, and the box body and the limiting beam are integrally cast and connected; along the second direction of the box body, the top surface of each limiting beam is formed with a plurality of first cavities that are recessed downward; the sealing plate is arranged on the top surface and covers the first cavity; the fixing member extends along the third direction of the box body and is connected to the sealing plate at least at one end, wherein the first direction, the second direction and the third direction are perpendicular to each other. A battery device, a box and an electrical device according to an embodiment of the present application have the advantage of high energy density.

Description

Technical Field

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

[0002] With the development of new energy, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of battery devices, its market demand is also constantly expanding.

[0003] Current battery devices generally have heavy casings, resulting in low energy density. Utility Model Content

[0004] Based on this, it is necessary to provide a battery device, a box and an electrical device to address the problem of low energy density.

[0005] A first aspect of an embodiment of the present application provides a battery device, comprising a battery cell, a box body and a fixing member; the box body comprises a box body, at least one limiting beam and at least one sealing plate; the battery cell and each limiting beam are arranged in the box body, each limiting beam extends along a first direction, and the box body and the limiting beam are integrally cast and connected; along the second direction of the box body, the top surface of each limiting beam is formed with a plurality of first cavities recessed downward; the sealing plate is arranged on the top surface and covers the first cavities; the fixing member extends along a third direction of the box body and is connected to the sealing plate at least at one end, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0006] The embodiment of the present application sets a box body and a limiting beam as an integral casting connection, and the structure is formed in one step, and no welding is required. Therefore, the airtight reliability is higher than that of the box body processed by profiles in the related technology, and the preparation process is shorter; under the same size conditions, the structural weight of the box body and the limiting beam using the die-casting process is lighter than that of the box body using profiles, thereby effectively saving weight, and the sealing plate is fixed to the fixing part, so that the fixing part is fixed to the box body, and then the fixing part can provide tension to the limiting beam along the third direction of the box to limit it, so as to prevent the limiting beam from tipping over, thereby avoiding the separation of the battery cell and the box body, so that the battery device has light weight, high energy density and stable structure.

[0007] In one embodiment, along the second direction, the bottom surface of each of the limiting beams is formed with a plurality of second cavities isolated from the first cavities. In this way, the second cavities serve as demoulding cavities for the limiting beams during casting, which can lighten the limiting beams on one hand and facilitate separation of the mold from the limiting beams on the other hand.

[0008] In one embodiment, the battery device includes a filler; wherein the filler is filled in the first chamber; and / or the filler is filled in the second chamber. By filling the filler in the first chamber and / or the second chamber, the overall structural strength of the limit beam is improved, thereby effectively resisting the expansion and deformation of the battery cell.

[0009] In one embodiment, the filler is foam, plastic or sponge.

[0010] In one embodiment, the limiting beam includes a first beam side surface, a second beam side surface and a support plate, and the first beam side surface, the top surface, the second beam side surface and the bottom surface are sequentially connected end to end;

[0011] The first beam side surface and the second beam side surface are arranged opposite to each other along the third direction; the support plate is supported between the first beam side surface and the second beam side surface, and the first cavity and the second cavity are located on both sides of the support plate along the second direction. In this way, the upper and lower molds of the mold can be pushed up and down along the second direction for die casting, thereby effectively reducing the die casting depth of the mold on one side and effectively reducing the difficulty of the die casting process.

[0012] In one embodiment, the first chamber and the second chamber are staggered when projected along the second direction of the box body. Thus, on the one hand, the first chamber and the second chamber are effectively saved in weight, and on the other hand, a three-dimensional support structure can be formed inside the limiting beam, thereby improving the structural rigidity.

[0013] In one embodiment, along the second direction of the box body, the depths of the first chamber and the second chamber are both half of the thickness of the box body.

[0014] In one embodiment, the cross-sectional dimension of the second cavity along the third direction gradually decreases along the second direction, and the cavity wall of the second cavity has a second demolding slope E and satisfies 0.5°≤E≤10°.

[0015] In one embodiment, the cross-sectional dimension of the first cavity along the third direction gradually decreases along the second direction, and the cavity wall of the first cavity has a first demolding slope D, and satisfies 0.5°≤D≤10°.

[0016] In one embodiment, the box body includes two limit beams and two sealing plates; the two limit beams are arranged in the box body at intervals along the third direction; the two sealing plates are respectively arranged on the top surfaces of the two limit beams; and the two ends of the fixing member are respectively connected to the two sealing plates. In this way, the embodiment of the present application uses an integral casting connection between the box body and the limit beam to obtain a lighter weight, and the sealing plate is fixed to the fixing member, so that the fixing member is fixed to the box body, and then the fixing member can provide a pulling force to limit the limit beam along the third direction of the box body, thereby preventing the limit beam from tipping over, and thereby avoiding the separation of the battery cell from the box body, so that the battery device has a light weight, a high energy density, and a stable structure.

[0017] A second aspect of an embodiment of the present application provides a box body for use in a battery device, the box body comprising a box body, at least one limiting beam and at least one sealing plate; the box body and the limiting beam are integrally cast and connected; the limiting beam extends along a first direction and is arranged in the box body; along a second direction, a plurality of first cavities recessed downward are formed on the top surface of the limiting beam; the sealing plate is arranged on the top surface and covers the first cavity.

[0018] A third aspect of the embodiments of the present application provides an electrical device, comprising the above-mentioned battery device.

[0019] 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

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0021] Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0022] Figure 3 A schematic diagram of the structure of a battery module provided in some embodiments of the present application.

[0023] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0024] Figure 5 Schematic diagram of the assembly of a box and a battery cell provided in some embodiments of the present application.

[0025] Figure 6 for Figure 5 FF cross-sectional view of the structure shown.

[0026] Figure 7 for Figure 6 Magnified view of region G of the structure shown.

[0027] Figure 8 for Figure 7 HH cross-sectional view of the structure shown.

[0028] Fig. 9 A schematic diagram of the structure of the box body provided in some embodiments of the present application.

[0029] Description of reference numerals:

[0030] Vehicles - 1000;

[0031] Battery 100, box 110, box cover 111, box body 112, battery module 120, battery cell 121, end cap 122, housing 123, electrode assembly 124, electrode terminal 125, controller 200, motor 300;

[0032] Fixing member 400, filler 500, limiting beam 10, first chamber 11, second chamber 12, bottom surface 13, first beam side surface 14, second beam side surface 15, top surface 16, supporting plate 17, sealing plate 20, first direction X, third direction Y, second direction Z. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0034] 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.

[0035] In the description of the embodiments of the present application, if the technical terms "first", "second", etc. appear, these terms are only used for descriptive purposes 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.

[0036] 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.

[0037] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] In the description of the embodiments of the present application, if the term "multiple" appears, "multiple" means at least two (including two), such as two, three, etc., unless otherwise clearly and specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" refers to more than two groups (including two groups), and if the term "multiple sheets" appears, "multiple sheets" refers to more than two sheets (including two sheets).

[0039] In the description of the embodiments of the present application, if the 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does 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 cannot be understood as a limitation on the embodiments of the present application.

[0040] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if the technical terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it 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. Moreover, the first feature being "above", "above" and "above" the 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 higher in level than the second feature. The first feature being "below", "below" and "below" the 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 lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0044] In the related art, the box of the battery device is usually formed by a frame combination, and the battery cell is contained in the box, which can provide protection for the battery cell when it is hit by an external impact. The current box often adopts a profile box and sets a limit beam to collide with the battery cell. The steel belt is fixed on the limit beam to provide tension to the two limit beams to prevent tipping, and the top of the battery cell is pressed by the steel belt to prevent the battery cell from moving up and down. Since the limit beam and the box are connected by welding, there will inevitably be weak connection points, which will affect the overall structural strength and rigidity of the beam structure. In addition, the box made of profiles is heavy. If the box and the limit beam are changed to die-casting, although the weight can be reduced to a certain extent, there will be a mold removal cavity on the surface of the limit beam, which makes it impossible to set the fixed steel belt on the limit beam.

[0045] In order to alleviate the problem of heavy battery box and low energy density, the box and the limiting beam can be cast and connected as one body to reduce the weight of the box, and a sealing plate can be separately provided on the limiting beam to cover the film removal cavity, thereby providing a fixed position and ensuring that the fixed steel belt can be connected to the limiting beam.

[0046] The embodiments of the present application provide a battery device and an electric device, which may be, but not limited to, a mobile phone, a tablet, a laptop computer, 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, a spacecraft, etc.

[0047] It should be understood that the technical solutions generally described in the embodiments of the present application are not limited to the battery devices and power-consuming devices described above, but can also be applied to all battery devices including a box and power-consuming devices using the battery devices. However, for the sake of simplicity of description, an power-consuming device in an embodiment of the present application is taken as an example of vehicle 1000.

[0048] 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 device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may 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 device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0049] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0050] Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of the battery module provided in some embodiments of the present application. Figure 2 and Figure 3 In order to meet different power requirements, the battery device 100 may include a plurality of battery cells 121 and a housing 110. The battery cell 121 refers to the smallest unit constituting the battery module 120 or the battery pack. The plurality of battery cells 121 may be connected in series and / or in parallel via electrode terminals for various applications.

[0051] The box body 110 can adopt a variety of structures. In some embodiments, the box body 110 can include a box cover 111 and a box body 112, the box cover 111 and the box body 112 cover each other, and the box cover 111 and the box body 112 jointly define a storage space for accommodating the battery cell 121. The box body 112 can be a hollow structure with one end open, and the box cover 111 can be a plate-like structure. The box cover 111 covers the open side of the box body 112, so that the box cover 111 and the box body 112 jointly define a storage space; the box cover 111 and the box body 112 can also be hollow structures with one side open, and the open side of the box cover 111 covers the open side of the box body 112. Of course, the box body 110 formed by the box cover 111 and the box body 112 can be in a variety of shapes, such as a simple three-dimensional structure such as a single cuboid or a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as a cuboid or a cylinder or a sphere, which is not limited in the embodiments of the present application. The material of the box body 110 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, etc., or a composite material such as glass fiber and epoxy resin, and the implementation mode of the present application is not limited to this.

[0052] In the embodiment of the present application, multiple battery cells 121 can directly form a battery pack, or they can first form a battery module 120, and then the battery module 120 can form a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel or mixed together to form a whole, and then the whole formed by multiple battery cells 121 is accommodated in the box 110. Alternatively, multiple battery cells 121 can first be connected in series, parallel or mixed together to form a battery module 120, and then multiple battery modules 120 can be connected in series, parallel or mixed together to form a whole, and then accommodated in the box 110.

[0053] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing electrical connection between the plurality of battery cells 121 .

[0054] Each battery cell 121 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery device, a sodium-ion battery device or a magnesium-ion battery device, but it is not limited to this. The battery cell 121 can be cylindrical, flat, rectangular or other shapes. The battery cell 121 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the implementation method of the present application is not limited to this. However, for the sake of simplicity, the following embodiments are all described by taking the square lithium-ion battery cell 121 as an example.

[0055] Please refer to Figure 4 , Figure 4The schematic diagram of the exploded structure of the battery cell 121 provided in some embodiments of the present application. The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124 and other functional components.

[0056] The end cap 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cap 122 can be adapted to the shape of the shell 123 to match the shell 123. Optionally, the end cap 122 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 122 is not easily deformed when it is squeezed and collided, so that the battery cell 121 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 125 can be provided on the end cap 122. The electrode terminal 125 can be used to electrically connect to the electrode assembly 124 for outputting or inputting electrical energy of the battery cell 121. In some embodiments, the end cap 122 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold. The material of the end cap 122 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 122 to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0057] The shell 123 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 121, wherein the formed internal environment can be used to accommodate the electrode assembly 124, the electrolyte and other components. The shell 123 and the end cap 122 can be independent components, and an opening can be set on the shell 123, and the internal environment of the battery cell 121 is formed by covering the opening with the end cap 122 at the opening. Without limitation, the end cap 122 and the shell 123 can also be integrated. Specifically, the end cap 122 and the shell 123 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 123, the end cap 122 covers the shell 123. The shell 123 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The shell 123 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0058] The electrode assembly 124 is a component in the battery cell 121 where an electrochemical reaction occurs. One or more electrode assemblies 124 may be contained in the housing 123. The electrode assembly 124 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 124, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device, the positive active material and the negative active material react with the electrolyte, and the pole ear connects the electrode terminal 125 to form a current loop.

[0059] Figure 5 Schematic diagram of the assembly of a box and a battery cell provided in some embodiments of the present application. Figure 6 for Figure 5 FF cross-sectional view of the structure shown. Figure 7 for Figure 6 Magnified view of region G of the structure shown. Figure 8 for Figure 7 HH cross-sectional view of the structure shown. Fig. 9 A schematic diagram of the structure of the box body provided in some embodiments of the present application.

[0060] A first aspect of the present application provides a battery device 100. Figures 5 to 9 As shown, the battery device 100 includes a battery cell 121 , a box body 110 and a fixing member 400 .

[0061] The box body 110 includes a box body 112, at least one limiting beam 10 and at least one sealing plate 20; the battery cell 121 and each limiting beam 10 are arranged in the box body 112, each limiting beam 10 extends along the first direction X, and the box body 112 and the limiting beam 10 are integrally cast and connected. Each limiting beam 10 extends along the first direction X of the box body 110 and is arranged in the box body 112; along the second direction Z of the box body 110, the top surface 16 of each limiting beam 10 is formed with a plurality of first cavities 11 that are recessed downward; the sealing plate 20 is arranged on the top surface 16 and covers the first cavities 11; the fixing member 400 extends along the third direction Y of the box body 110 and is connected to the sealing plate 20 at least at one end. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0062] The battery cell 121 is contained in the box body 110. Specifically, the battery cell 121 is contained in a containing space defined by the box cover 111 and the box body 112. The limiting beam 10 is used to be placed in the box body 110 as a side wall of the containing space, and the containing space can contain multiple battery cells 121 or battery modules 120 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 121.

[0063] By setting the box body 112 and the limiting beam 10 to be integrally cast and connected, the structure is formed in one step and does not require welding. Therefore, the airtight reliability is higher than that of the box body processed by profiles in the related art, and the preparation process is shorter; under the same size conditions, the box body 112 and the limiting beam 10 are made of die-casting technology, which is lighter than the box body made of profiles, thereby effectively saving weight and effectively improving the energy density of the battery device 100.

[0064] The top surface 16 of the limiting beam 10 is formed with a plurality of downwardly recessed first cavities 11; specifically, all the first cavities 11 can be arranged on the top surface 16 of the limiting beam 10 along the first direction X of the box body 110; the first cavity 11 serves as a demolding cavity for the limiting beam 10 during casting, which can lighten the limiting beam 10 on the one hand and facilitate separation of the mold from the limiting beam 10 on the other hand.

[0065] The cross-sectional dimension of the first cavity 11 along the third direction Y gradually decreases along the second direction Z. Specifically, the first cavity 11 is a tapered cavity with a large mouth and a small belly, and the cavity wall of the first cavity 11 has a first demoulding slope D, and satisfies 0.5°≤D≤10°.

[0066] The sealing plate 20 can be a long strip of metal plate. The sealing plate 20 extends along the first direction X of the box body 110 and is fixedly arranged on the top surface 16 of the limiting beam 10. Since the limiting beam 10 is formed by die-casting, there are fewer internal reinforcing ribs, and the sealing plate 20 is fixed to the opening of the first chamber 11 to improve the overall structural strength of the limiting beam 10. The sealing plate 20 can be used to provide an installation position for the fixing member 400; the fixing member 400 extends along the third direction Y of the box body 110 and is connected to the sealing plate 20 at least at one end, and the fixing member 400 is fixed to the limiting beam 10 through the sealing plate 20.

[0067] In this way, the embodiment of the present application adopts an integral casting connection between the box body 112 and the limit beam 10 to obtain a lighter weight. At the same time, the sealing plate 20 is fixed to the fixing member 400, so that the fixing member 400 is fixed to the box body 112, and the fixing member 400 can provide a pulling force to limit the limit beam 10 along the third direction Y of the box body 110 to prevent the limit beam 10 from tipping over, thereby avoiding the battery cell 121 from separating from the box body 110, so that the battery device 100 has a light weight, a high energy density and a stable structure.

[0068] It is understandable that, combined with Figures 5 to 7 The first direction X of each embodiment of the present application may be the width direction of the box 110 shown in the drawings, the second direction Z may be the thickness direction of the box 110 shown in the drawings, and the third direction Y may be the length direction of the box 110 shown in the drawings.

[0069] Optionally, the sealing plate 20 may be made of, but is not limited to, an aluminum alloy plate, a steel plate or a copper plate.

[0070] Optionally, the limiting beam 10 may be made of, but not limited to, aluminum alloy, stainless steel or carbon steel.

[0071] Optionally, the sealing plate 20 and the limiting beam 10 may be connected by bolts or welding, but is not limited to the connection.

[0072] Optionally, the sealing plate 20 and the fixing member 400 may be connected by bolts or welding, but is not limited to the connection.

[0073] In some possible embodiments, see Figures 5 to 9 As shown, along the second direction Z of the box body 112, the bottom surface 13 of each limiting beam 10 is formed with a plurality of second chambers 12 isolated from the first chamber 11.

[0074] In this way, the second cavity 12 serves as a demoulding cavity during casting of the limiting beam 10 , which can lighten the limiting beam 10 on the one hand and facilitate separation of the mold from the limiting beam 10 on the other hand.

[0075] The cross-sectional dimension of the second cavity 12 along the third direction Y gradually decreases along the second direction Z; specifically, the second cavity 12 is a conical cavity with a large mouth and a small belly, and the cavity wall of the second cavity 12 has a second demolding slope E and satisfies 0.5°≤E≤10°.

[0076] The second chambers 12 are disposed on the bottom surface 13 of the limiting beam 10 . Specifically, all the second chambers 12 are arranged on the bottom surface 13 of the limiting beam 10 along the first direction X of the box body 110 .

[0077] The first cavity 11 is arranged on the top surface 16 of the limiting beam 10 , and the first cavity 11 and the second cavity 12 correspond to each other and extend toward each other along the second direction Z to ensure that the limiting beam 10 has a lighter mass as a whole and has better structural strength.

[0078] In some possible embodiments, see Figures 5 to 9 As shown, the battery device includes a filler 500 , wherein the filler 500 is filled in the first chamber 11 ; and / or the filler 500 is filled in the second chamber 12 .

[0079] The limiting beam 10 is integrally formed by die casting, so there are fewer internal reinforcing ribs. The filler 500 is filled in the first cavity 11 and / or the second cavity 12 to improve the overall structural strength of the limiting beam 10, thereby effectively resisting the expansion and deformation of the battery cell 121.

[0080] Optionally, the filler 500 is foam, plastic or sponge, wherein the foam can be polyurethane foam, and the plastic can be polyethylene, polytetrafluoroethylene, etc.

[0081] In some embodiments of the present application, the sealing plate 20 is fixed on the opening of the first chamber 11, so as to prevent the filler 500 from falling out of the first chamber 11. The opening of the second chamber 12 faces downward and can be closed by a cold plate (not shown) in the battery device 100 to prevent the filler 500 in the second chamber 12 from falling out.

[0082] In some possible embodiments, see Figures 5 to 9 As shown, the limiting beam 10 includes a support plate 17 , which is supported inside the limiting beam 10 , and the first cavity 11 and the second cavity 12 are respectively located on both sides of the support plate 17 along the second direction Z of the box body 110 .

[0083] Among them, the limiting beam 10 includes a first beam side surface 14, a second beam side surface 15 and a support plate 17, the first beam side surface 14, the top surface 16, the second beam side surface 15 and the bottom surface 13 are connected end to end in sequence; the first beam side surface 14 and the second beam side surface 15 are relatively arranged along the third direction Y; the support plate 17 is supported between the first beam side surface 14 and the second beam side surface 15, and the first cavity 11 and the second cavity 12 are located on both sides of the support plate 17 along the second direction Z.

[0084] The first beam side surface 14 , the second beam side surface 15 and the support plate 17 may be integrally connected. The limiting beam 10 may be made of aluminum alloy and formed by a die-casting process, and has good structural strength and light weight.

[0085] The first beam side surface 14 and the second beam side surface 15 are arranged relatively along the third direction Y of the box body 110. The second beam side surface 15 can abut against the large surface of the battery cell 121 along the third direction Y, thereby preventing the battery cell 121 from deforming freely. The first beam side surface 14 can be inclined toward the second beam side surface 15. In various embodiments of the present application, the large surface refers to the side with the largest surface area in the battery cell 121.

[0086] The first cavity 11 can be formed by the first beam side surface 14, the second beam side surface 15 and the support plate 17, and an opening is formed on the top surface 16; the second cavity 12 can be formed by the first beam side surface 14, the second beam side surface 15 and the support plate 17, and an opening is formed on the bottom surface 13.

[0087] The first cavity 11 and the second cavity 12 are distributed on both sides of the support plate 17 along the second direction Z of the box body 110. In this way, the upper and lower dies of the mold can be pushed up and down along the second direction Z respectively for die casting, thereby effectively reducing the die casting depth of the mold on one side and effectively reducing the difficulty of the die casting process.

[0088] Specifically, along the second direction Z of the box body 110 , the depths of the first chamber 11 and the second chamber 12 are both half of the thickness of the box body 112 .

[0089] In some other possible embodiments, along the second direction Z of the box body 110, the depth of the first chamber 11 may be 0.2 times, 0.3 times, 0.4 times, or 0.6 times the thickness of the box body 112; at the same time, along the second direction Z of the box body 110, the depth of the second chamber 12 may be 0.2 times, 0.3 times, 0.4 times, or 0.6 times the thickness of the box body 112, which is subject to the design and is not limited in this application.

[0090] In some possible embodiments, see Figures 5 to 9 As shown, along the second direction Z projection of the box body 110, the first chamber 11 and the second chamber 12 are staggered. In this way, on the one hand, by setting the first chamber 11 and the second chamber 12, weight is effectively saved, and on the other hand, a three-dimensional support structure can be formed inside the limiting beam 10, thereby improving the structural rigidity.

[0091] In some possible embodiments, see Figures 5 to 9 As shown, the box body 110 includes two limit beams 10 and two closing plates 20 .

[0092] The two limiting beams 10 are spaced apart in the box body 112 along the third direction Y of the box body 110 to define a containing space, thereby preventing liquid or other foreign matter from affecting the charging or discharging of the battery cells 121 .

[0093] The two sealing plates 20 are respectively arranged on the top surfaces 16 of the two limiting beams 10; the two ends of the fixing member 400 are respectively connected to the two sealing plates 20. In this way, the embodiment of the present application uses an integral casting connection between the box body 112 and the limiting beam 10 to obtain a lighter weight. The sealing plates 20 are fixed to the fixing member 400, so that the fixing member 400 is fixed to the box body 112, and the fixing member 400 can provide a pulling force to limit the limiting beam 10 along the third direction Y of the box body 110, thereby preventing the limiting beam 10 from tipping over, and thereby preventing the battery cell 121 from separating from the box body 110, so that the battery device 100 has a light weight, a high energy density and a stable structure.

[0094] Optionally, the fixing member 400 may be, but is not limited to, a steel belt structure, and the steel belt is extended along the third direction Y. Taking two limiting beams 10 as an example, the opposite ends of the steel belt in the third direction Y are connected to the two limiting beams 10 respectively, so as to provide tension to the two limiting beams 10 along the third direction Y.

[0095] In this way, when the battery cell 121 expands and deforms, the fixing member 400 can tighten the limiting beams 10 at both ends through tension, reducing the probability of the limiting beams 10 tipping over due to the expansion force of the battery cell 121, thereby making the support and restraint of the battery cell 121 by the limiting beams 10 more stable.

[0096] It is understandable that when only one limiting beam 10 is provided, one end of the fixing member 400 is fixed to the limiting beam 10 via the sealing plate 20 , and the other end of the fixing member 400 can be fixed to the box body 112 , thereby preventing the limiting beam 10 from tipping over.

[0097] Optionally, in each embodiment of the present application, refer to Figures 5 to 9 As shown, there may be a plurality of fixing members 400 , and the plurality of fixing members 400 are arranged at intervals along the first direction X and extend along the third direction Y.

[0098] A second aspect of the present application provides a box body, which is applied to the above-mentioned battery device 100 .

[0099] The box body includes a box body 112, at least one limiting beam 10 and at least one closing plate 20; the box body 112 and the limiting beam 10 are integrally cast and connected; the limiting beam 10 extends along a first direction X and is arranged in the box body 112; along a second direction Z, a top surface 16 of the limiting beam 10 is formed with a plurality of first cavities 11 that are recessed downward; the closing plate 20 is arranged on the top surface 16 and covers the first cavities 11.

[0100] In this way, the box body 110 is connected by an integral casting through the box body 112 and the limiting beam 10, which can obtain a lighter weight, thereby improving the energy density of the battery device 100 using the box body 110; in addition, the sealing plate 20 is fixed to the fixing member 400, so that the fixing member 400 is fixed to the box body 112, and then the fixing member 400 can provide a pulling force to limit the limiting beam 10 along the third direction Y of the box body 110, thereby preventing the limiting beam 10 from tipping over, thereby avoiding the battery cell 121 from separating from the box body 110, so that the battery device 100 has a light weight, high energy density and a stable structure.

[0101] According to a third aspect of the embodiments of the present application, there is provided an electric device 1000. The electric device 1000 includes the battery device 100 described above, and the battery device 100 is used to provide electric energy to the electric device 1000 or store electric energy.

[0102] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery device, characterized in that: It comprises a battery cell (121), a box body (110) and a fixing member (400); The box body (110) comprises a box body (112), at least one limiting beam (10) and at least one sealing plate (20); The battery cell (121) and each of the limiting beams (10) are arranged in the box body (112), each of the limiting beams (10) extends along a first direction (X), and the box body (112) and the limiting beams (10) are integrally cast and connected; Along the second direction (Z) of the box body (110), a plurality of first chambers (11) recessed downwards are formed on the top surface (16) of each of the limiting beams (10); The sealing plate (20) is arranged on the top surface and covers the first chamber (11); The fixing member (400) extends along a third direction (Y) of the box body (110) and is connected to the sealing plate (20) at least at one end, wherein the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery device according to claim 1, characterized in that: Along the second direction (Z), a plurality of second chambers (12) isolated from the first chamber (11) are formed on the bottom surface (13) of each of the limiting beams (10).

3. The battery device according to claim 2, characterized in that: The battery device comprises a filler (500); Wherein, the filler (500) is filled in the first chamber (11); and / or, the filler (500) is filled in the second chamber (12).

4. The battery device according to claim 3, characterized in that: The filler (500) is foamed cotton, plastic or sponge.

5. The battery device according to claim 2, characterized in that: The limiting beam (10) comprises a first beam side surface (14), a second beam side surface (15) and a support plate (17), wherein the first beam side surface (14), the top surface (16), the second beam side surface (15) and the bottom surface (13) are connected end to end in sequence; The first beam side surface (14) and the second beam side surface (15) are arranged opposite to each other along the third direction (Y); the support plate (17) is supported between the first beam side surface (14) and the second beam side surface (15); and the first cavity (11) and the second cavity (12) are located on both sides of the support plate (17) along the second direction (Z).

6. The battery device according to claim 2, characterized in that: Projected along the second direction (Z) of the box body (110), the first chamber (11) and the second chamber (12) are arranged in a staggered manner.

7. The battery device according to claim 2, characterized in that: Along the second direction (Z) of the box body (110), the depths of the first chamber (11) and the second chamber (12) are both half the thickness of the box body (112).

8. The battery device according to claim 2, characterized in that: The cross-sectional dimension of the second cavity (12) along the third direction (Y) gradually decreases along the second direction (Z), and the cavity wall of the second cavity (12) has a second demoulding slope E and satisfies 0.5°≤E≤10°.

9. The battery device according to any one of claims 1 to 8, characterized in that: The cross-sectional dimension of the first cavity (11) along the third direction (Y) gradually decreases along the second direction (Z), and the cavity wall of the first cavity (11) has a first demoulding slope D and satisfies 0.5°≤D≤10°.

10. The battery device according to any one of claims 1 to 8, characterized in that: The box body (110) comprises two limit beams (10) and two sealing plates (20); The two limiting beams (10) are arranged in the box body (112) at intervals along the third direction (Y); the two sealing plates (20) are respectively arranged on the top surfaces (16) of the two limiting beams (10); and the two ends of the fixing member (400) are respectively connected to the two sealing plates (20).

11. A box used in a battery device, characterized in that: The box body comprises a box body (112), at least one limiting beam (10) and at least one sealing plate (20); The box body (112) and the limiting beam (10) are integrally cast and connected; The limiting beam (10) extends along a first direction (X) and is arranged in the box body (112); Along the second direction (Z), a top surface (16) of the limiting beam (10) is formed with a plurality of first chambers (11) recessed downwards; The sealing plate (20) is arranged on the top surface (16) and covers the first chamber (11).

12. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 10.

Images