Battery device, energy storage device, power utilization device and box body

Abstract

The utility model discloses a battery device, an energy storage device, a power utilization device and a box body, and relates to the technical field of batteries, the battery device comprises the box body and one or more battery cells, the box body comprises a frame and a bottom plate, the frame is made of metal, a supporting part is arranged on the frame, and at least one part of the supporting part is arranged on the inner side of the frame; the bottom plate is arranged on the inner side of the frame, the bottom plate abuts against the supporting part and is connected with the supporting part, the frame and the bottom plate define a containing space used for containing the battery cell, the bottom plate comprises a first composite layer, a metal layer and a second composite layer, the first composite layer is arranged on the side, facing the containing space, of the metal layer, and the second composite layer is arranged on the side, facing the containing space, of the metal layer. The second composite material layer is arranged on the side, back to the containing space, of the metal layer. According to the scheme, the problem that the battery device is heavy can be solved, and the reliability of structural strength is considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, an energy storage device, an electric device and a box. BACKGROUND

[0002] The new energy battery device has the characteristics of storing energy or releasing energy according to the needs, and is more and more widely used in various electric devices and energy storage devices.

[0003] However, the weight of the battery device is too large, which limits the application of the battery device in occasions with high weight requirements.

[0004] The information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. Invention content

[0005] The purpose of the embodiments of the present application is to provide a battery device, an energy storage device, an electric device and a box, which can improve the problem of large weight of the battery device, the energy storage device, the electric device and the box, while considering the reliability of the structural strength.

[0006] The embodiments of the first aspect of the present application provide a battery device, comprising a box and one or more battery cells contained in the box, the box comprising: a frame, the material of the frame being metal, the frame being provided with a support portion, at least a part of the support portion being located on the inner side of the frame; a bottom plate located on the inner side of the frame, the bottom plate being supported on the support portion and connected with the support portion, the frame and the bottom plate enclosing a containing space for containing the battery cells, the bottom plate comprising a first composite layer, a metal layer and a second composite layer, the first composite layer being arranged on the side of the metal layer facing the containing space, and the second composite layer being arranged on the side of the metal layer facing away from the containing space.

[0007] In the embodiments of the present application, the composite layer has high structural strength, and is better insulated and lighter than metal. By arranging the bottom plate to comprise the first composite layer, the second composite layer and the metal layer located between the first composite layer and the second composite layer, the metal material of the bottom plate can be reduced under the premise of meeting the structural strength requirement of the bottom plate, so as to realize the thinning and weight reduction of the bottom plate, which is beneficial to improve the volume of the box and reduce the weight of the box and the battery device, and is beneficial to improve the insulation of the bottom plate and the battery cells in the containing space and reduce the risk of sparking.

[0008] In the embodiment, the support portion is arranged on the frame, at least a part of the support portion is located in the frame, the bottom plate is located in the frame, the bottom plate is arranged on the support portion and connected with the support portion. The bottom plate is supported by the support portion, so that the bottom plate is not easy to leak from the bottom of the frame, thereby reducing the risk of loosening between the bottom plate and the frame, and solving the problem that the bottom plate and the frame with different materials are difficult to be firmly connected. In addition, the support portion can further improve the bearing capacity of the bottom plate, thereby further promoting the thinning of the bottom plate and improving the problem of large weight of the box body and the battery device.

[0009] According to some embodiments of the present application, the part of the bottom plate arranged on the support portion is connected to the support portion by the first connecting member.

[0010] The first connecting member is used to connect the support portion and the part of the bottom plate arranged on the support portion, so as to further improve the structural strength and reliability of the box body.

[0011] According to some embodiments of the present application, the support portion is provided with a support surface for supporting the bottom plate, and the bottom plate is arranged on the support surface, wherein the first sealing layer is arranged between the support surface and the bottom plate.

[0012] The first sealing layer is used to reduce the risk of water leakage between the bottom plate and the support surface, thereby reducing the risk of water entering or soaking the battery cell.

[0013] According to some embodiments of the present application, a groove is arranged at the edge of the side of the bottom plate opposite to the accommodation space, and the support portion is located in the groove.

[0014] The groove is used in cooperation with the support portion, so as to improve the positioning effect between the bottom plate and the frame, improve the assembly efficiency between the bottom plate and the frame, facilitate the bottom surface of the support portion and the bottom surface of the bottom plate to be substantially kept at the same horizontal plane, thereby improving the regularity of the bottom surface of the box body, reducing the risk of scratching caused by the local convexity of the support portion, and facilitating the reduction of the overall height of the box body.

[0015] According to some embodiments of the present application, the bottom plate further comprises a heat exchange component layer arranged on the side of the metal layer close to the accommodation space, and the first composite layer is arranged on the side of the heat exchange component layer away from the metal layer.

[0016] The bottom plate of the embodiments of the present application further comprises a heat exchange component layer, so that the bottom plate has a heat management function, thereby reducing the occupation of the heat management component to the accommodation space, saving the volume of the box body, achieving weight reduction of the box body, the heat exchange component layer is arranged on the side of the metal layer close to the accommodation space, the metal layer can protect the heat exchange component layer and the battery cell in the accommodation space, the side of the heat exchange component layer away from the metal layer is provided with a first composite layer, and the side of the metal layer away from the heat exchange component layer is provided with a second composite layer, the composite layer has high structural strength, and is better insulated and lighter than the metal structure, the structural layout of the heat exchange component layer and the metal layer between the first composite layer and the second composite layer can improve the structural rigidity of the bottom plate and the insulation between the heat exchange component layer and the battery cell, and reduce the overall weight of the bottom plate, thereby promoting the lightweight of the battery device and improving the problem of large weight of the battery device.

[0017] According to some embodiments of the present application, at least a part of the heat exchange component layer is spaced apart from the metal layer; the bottom plate further comprises a buffer layer, and the buffer layer is filled in the space between the heat exchange component layer and the metal layer.

[0018] The buffer layer arranged between the heat exchange component layer and the metal layer can buffer and absorb energy, thereby improving the impact resistance and extrusion resistance of the bottom plate. In the impact working condition of the bottom of the box body, the buffer layer can provide a buffering and energy absorbing effect to protect the heat exchange component layer inside the bottom plate and the battery cell in the accommodation space.

[0019] According to some embodiments of the present application, the buffer layer comprises a combination of one or more of structural foam and structural rubber.

[0020] The structural foam has low density, light weight, good buffering and energy absorbing effect, thereby improving the impact resistance and extrusion resistance of the bottom plate, and facilitating the lightweight of the battery device. The structural foam itself has a very low thermal conductivity, and the structural foam can simultaneously insulate the heat exchange component layer, reduce the cold and heat loss of the heat exchange component layer, and improve the heat management efficiency of the bottom plate on the battery cell.

[0021] The structural rubber has elasticity and can well buffer and absorb energy, thereby improving the impact resistance and extrusion resistance of the bottom plate. The density of the structural rubber is lower than that of the metal, and the thermal conductivity of the structural rubber is lower than that of the metal, so that the lightweight and insulation effect of the heat exchange component layer of the battery device can be simultaneously considered.

[0022] According to some embodiments of the present application, the battery device further comprises a structural beam arranged in the accommodation space, a connecting hole penetrating through the bottom plate is arranged, a second connecting piece is arranged in the connecting hole, and the bottom plate is connected to the structural beam through the second connecting piece.

[0023] The second connecting piece is used to connect the bottom plate to the structural beam, which can further improve the structural rigidity of the box body.

[0024] According to some embodiments of the present application, the connecting hole comprises a first hole on the metal layer and a second hole on the heat exchange component layer; a portion of the metal layer is provided as a first recessed groove portion that is recessed towards the heat exchange component layer; the buffer layer is provided with a through-going avoiding through hole; the first recessed groove portion penetrates the avoiding through hole and is provided opposite to the heat exchange component layer; the first hole is arranged in the first recessed groove portion and is in position correspondence with the second hole.

[0025] Since the first recessed groove portion penetrates the avoiding through hole and is provided opposite to the heat exchange component layer, at the connecting position where the bottom plate and the structural beam are connected based on the second connecting member, there is no buffer layer between the metal layer and the heat exchange component layer, so that the torsion attenuation at this connecting position can be reduced, and the connection strength and reliability between the bottom plate and the structural beam can be further improved.

[0026] According to some embodiments of the present application, the second composite layer is provided with a second recessed groove portion corresponding to the portion of the first recessed groove portion, the second recessed groove portion is located in the first recessed groove portion, the connecting hole further comprises a third hole on the second composite layer, the third hole is arranged in the second recessed groove portion, the third hole is in position correspondence with the first hole, and the second connecting member is provided with an end portion, the end portion is accommodated in the second recessed groove portion.

[0027] By accommodating the end portion of the second connecting member in the second recessed groove portion, the end portion of the second connecting member can be prevented from protruding out of the lower surface of the bottom plate or the protruding height of the end portion of the second connecting member relative to the lower surface of the bottom plate can be reduced, so that the risk of scratching caused by the local protrusion of the second connecting member can be reduced, and the overall height of the box body can be reduced.

[0028] According to some embodiments of the present application, the second recessed groove portion is further provided with a second sealing layer; the second sealing layer is filled in the second recessed groove portion and encapsulates the end portion in the second recessed groove portion; and / or a portion of the second sealing layer is filled between the end portion and the second recessed groove portion.

[0029] By using the second sealing layer, the risk of water leakage at the connecting position of the bottom plate and the structural beam can be reduced, so that the risk of water entering or soaking the battery cell can be reduced.

[0030] According to some embodiments of the present application, the heat exchange component layer comprises a first plate body and a second plate body provided opposite to each other, the second plate body is arranged on the side of the first plate body away from the first composite layer, the second plate body is provided with first recessed portions and second recessed portions arranged alternately, the first recessed portions are recessed away from the first plate body, and the first recessed portions and the first plate body enclose flow channels, and the second recessed portions abut against the first plate body to separate adjacent flow channels.

[0031] The flow channels enclosed by the first recessed portions and the first plate body can be used for the flow of water and other heat carrying media, so that the heat carrying media can be used to efficiently cool or heat the battery cell, improve the heat management efficiency of the battery cell, and reduce the risk of swelling failure of the battery cell.

[0032] According to some embodiments of the present application, the first recessed portion is recessed towards and extends into the second recessed portion, and the second hole includes a first sub-hole on the first plate body and a second sub-hole in the second recessed portion, both of which correspond to the first hole in position.

[0033] By recessing the first recessed portion towards and extending it into the second recessed portion, and by arranging the second sub-hole in the second recessed portion, the connection position of the bottom plate and the structural beam based on the second connecting piece can be avoided from the flow channel, which on the one hand reduces the influence on the laminar flow area of the heat exchange component, and on the other hand, due to the arrangement of the buffer layer avoiding hole at the connection position, by avoiding the connection position from the flow channel, the cold and heat loss of the heat exchange component layer is also reduced, and the connection reliability between the first plate body and the second plate body is further strengthened by the second connecting piece.

[0034] According to some embodiments of the present application, the first composite layer includes a first composite skin arranged on the side of the metal layer facing the accommodation space, and the first composite skin forms the surface of the bottom plate arranged towards the accommodation space; and the second composite layer includes a second composite skin arranged on the side of the metal layer away from the accommodation space, and the second composite skin forms the surface of the bottom plate arranged away from the accommodation space.

[0035] The first composite skin is used to form the surface of the bottom plate arranged towards the accommodation space, and / or the second composite skin is used to form the surface of the bottom plate arranged away from the accommodation space, wherein the composite skin can better meet the light and thin demand and high strength demand of the bottom plate by using its own characteristics of thin thickness, high strength and light weight, and the metal layer and other inner layer structures of the bottom plate are covered by the composite skin to form an integrated bottom plate, which helps to further improve the structural strength and stability of the bottom plate as a whole.

[0036] According to some embodiments of the present application, the first composite layer includes fibers and a matrix attached to the fibers; and / or the second composite layer includes fibers and a matrix attached to the fibers.

[0037] The first composite layer and / or the second composite layer include fibers and a matrix attached to the fibers, which improves the strength of the first composite layer and / or the second composite layer while making the density of the first composite layer and / or the second composite layer smaller, thereby improving the weight reduction effect on the battery device.

[0038] According to some embodiments of the present application, the edge of the first composite layer is arranged in a first edge wrapping structure, and the first edge wrapping structure extends to the edge of the second composite layer; or the edge of the second composite layer is arranged in a second edge wrapping structure, and the second edge wrapping structure extends to the edge of the first composite layer.

[0039] The first or second edge covering structure is used to cover the edge position of the bottom plate, so that the internal heat exchange component layer, metal layer and other structures can be more completely covered, and the overall structural stability, structural strength and insulation of the bottom plate are further improved.

[0040] The second aspect of the application provides a box, comprising: a frame, the material of the frame is metal, the frame is provided with a support part, at least a part of the support part is located on the inner side of the frame; a bottom plate is located on the inner side of the frame, the bottom plate is supported on the support part and connected with the support part, the frame and the bottom plate enclose a containing space for containing the battery cell, the bottom plate comprises a first composite layer, a metal layer and a second composite layer, the first composite layer is arranged on one side of the metal layer facing the containing space, and the second composite layer is arranged on the side of the metal layer away from the containing space.

[0041] The composite layer has high structural strength, better insulation and lighter weight than metal. By arranging the bottom plate to comprise the first composite layer, the second composite layer and the metal layer between the first composite layer and the second composite layer, the metal material of the bottom plate can be reduced under the premise of meeting the structural strength requirement of the bottom plate, thereby achieving the thinning and lightening of the bottom plate, improving the volume of the box and reducing the weight of the box, and improving the insulation of the bottom plate and the battery cell in the containing space and reducing the risk of sparking.

[0042] Since the bottom plate is a multi-layer structure and the metal layer of the bottom plate is embedded between the first composite layer and the second composite layer, in order to assemble the metal frame and the bottom plate with the embedded metal layer, a support part is arranged on the frame in this embodiment, at least a part of the support part is located in the frame, and the bottom plate is located in the frame. The bottom plate is supported on the support part and connected with the support part. The support part supports the bottom plate, so that the bottom plate is not easy to fall out from the bottom of the frame, thereby reducing the risk of loosening between the bottom plate and the frame, solving the problem that the bottom plate and the frame with different materials are difficult to be firmly connected, and further improving the carrying capacity of the bottom plate by supporting the bottom plate with the support part, thereby further promoting the thinness of the bottom plate and improving the problem of large weight of the box.

[0043] The third aspect of the application provides an energy storage device, comprising: the battery device of any one of the embodiments of the first aspect; or the box of any one of the embodiments of the second aspect.

[0044] Since the energy storage device comprises the above-mentioned battery device or box, the battery device or box has lighter weight and reliable structural strength, so the energy storage device has lighter weight and reliable structural strength.

[0045] The embodiment of the fourth aspect of the present application provides a power utilization device, comprising: the battery device in any one of the embodiments of the first aspect; or the box in any one of the embodiments of the second aspect.

[0046] Since the power utilization device comprises the battery device or the box as described above, the battery device or the box has a lighter weight and reliable structural strength, and thus the power utilization device has a lighter weight and reliable structural strength.

[0047] Additional aspects and advantages of the embodiments of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0048] The above and / or additional aspects and advantages of the embodiments of the present application will become apparent and be readily appreciated from the following description, from the drawings, and from the claims.

[0049] Figure 1 FIG. 1 is a structural schematic diagram of a vehicle of one or more embodiments.

[0050] Figure 2 FIG. 2 is a perspective exploded structural schematic diagram of a battery device of one or more embodiments.

[0051] Figure 3 FIG. 3 is a perspective structural schematic diagram of an electric core of one or more embodiments.

[0052] Figure 4 FIG. 4 is a perspective exploded structural schematic diagram of an electric core of one or more embodiments.

[0053] Figure 5 FIG. 5 is a cross-sectional structural schematic diagram of a box of one or more embodiments.

[0054] Figure 6 FIG. 6 is Figure 5 FIG. 7 is an enlarged structural schematic diagram of the A part shown in FIG. 6.

[0055] Figure 7 FIG. 8 is a partial enlarged schematic diagram of a cross-sectional structure of the box of one or more embodiments.

[0056] Figure 8 FIG. 9 is a perspective exploded structural schematic diagram of a bottom plate of one or more embodiments.

[0057] Figure 9 FIG. 10 is a perspective exploded structural schematic diagram of a box and a structural beam of one or more embodiments.

[0058] Figure 10 FIG. 11 is a cross-sectional structural schematic diagram of a box of one or more embodiments.

[0059] Figure 11 FIG. 12 isFigure 10 An enlarged structural schematic view of part B in FIG. 1.

[0060] Figure 12 An enlarged schematic view of a partial cross-sectional structure of a box of one or more embodiments.

[0061] Figure 13 An enlarged schematic view of a partial cross-sectional structure of a box of one or more embodiments.

[0062] Reference Signs:

[0063] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, battery cell; 11, shell; 111, end cover; 112, housing; 12, electrode assembly; 121, tab; 13, electrode terminal; 14, pressure relief structure; 20, battery box; 21, first part; 22, second part; 23, first connecting piece; 24, second connecting piece; 241, end portion; 25, structural beam; 30, containing space; 31, frame; 311, support portion; 312, support surface; 313, first sealing layer; 32, bottom plate; 41, first composite layer; 411, avoiding opening; 42, heat exchange component layer; 421, first plate body; 422, second plate body; 423, first recessed portion; 424, second recessed portion; 425, flow channel; 426, water inlet / outlet; 43, metal layer; 431, first recessed portion; 44, second composite layer; 441, second recessed portion; 442, second edge covering structure; 443, second sealing layer; 45, buffer layer; 451, avoiding through hole; 46, connecting hole; 47, recess. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0065] The terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the data so distinguished can occur in any order. The terms "first", "second", and the like are used an identically for convenience, and thus, do not imply a particular order or chronology. The objects identified as "first", "second", and the like are not limited to only two objects, but can comprise more than two objects. Furthermore, the terms "and / or" and "or" as used herein are used to associate one or more objects together, and are not limited to meanings of "exclusive or" unless expressly stated otherwise.

[0066] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely used for convenience and simplification of the description of the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0067] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0068] The following is a summary of the embodiments of the present application.

[0069] New energy battery devices are widely used in various power consuming devices and energy storage devices due to their characteristics of storing and releasing energy as needed. For example, battery devices can be used in energy storage devices of water power, thermal power, wind power and solar power plants, and can also be used in various power consuming devices, such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. And with the continuous expansion of the application field of battery devices, the market demand is also increasing.

[0070] In the related art, a battery device has a battery box and a plurality of battery cells. The battery box generally includes a box body and a cover body. The plurality of battery cells are accommodated in the box body, and the cover body is combined with the box body to encapsulate the battery cells in the battery box. The box body serves to accommodate the battery cells and protect the battery cells. Based on this, the present inventors have found that the structural strength of the box body can be improved to some extent by increasing the material strength and thickness of the box body, thereby improving the protection effect of the box body on the battery cells. Meanwhile, the present inventors have also found that increasing the material strength and thickness of the box body will cause the weight of the box body to increase, thereby causing the weight of the battery device to increase. However, if the weight of the battery device is too large, it will limit the application of the battery device in occasions with high weight requirements.

[0071] To alleviate the above problems, embodiments of the present application provide a battery device. The box body of the battery device includes a frame and a bottom plate connected with the frame. The bottom plate is a multi-layer structure and specifically includes a first composite layer, a metal layer, and a second composite layer arranged in sequence. The composite layer has high structural strength and better insulation and lighter weight than metal. Therefore, under the premise of meeting the structural strength requirement of the bottom plate, the embodiments can reduce the metal material of the bottom plate, thereby achieving the thinning and weight reduction of the bottom plate, which is conducive to improving the volume of the box body and reducing the weight of the box body and the battery device, and is conducive to improving the insulation of the bottom plate and the battery cells in the accommodation space and reducing the risk of sparking.

[0072] In the related art, to meet the connection strength requirement between the bottom plate and the frame, the same material is generally required for the bottom plate and the frame. In the embodiments, the bottom plate is a multi-layer structure, and the metal layer of the bottom plate is built-in between the first composite layer and the second composite layer. To assemble the frame made of metal material and the bottom plate with the built-in metal layer, a support portion is provided on the frame in the embodiments. At least a part of the support portion is located in the frame, and the bottom plate is located in the frame and is connected with the support portion by being rested on the support portion. The support portion supports the bottom plate, so that the bottom plate is less likely to leak out from the bottom of the frame, thereby reducing the risk of loosening between the bottom plate and the frame, solving the problem that the bottom plate and the frame made of different materials are difficult to be firmly connected, and further improving the bearing capacity of the bottom plate by using the support portion to support the bottom plate, thereby further promoting the thinness of the bottom plate and improving the problem of large weight of the box body and the battery device.

[0073] The battery device disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship, or an aircraft, but is not limited thereto. The battery device disclosed in the present application can be used to form a power supply system of the electric device, which is conducive to reducing the weight of the electric device.

[0074] The embodiments of the present application provide a power consumption device using a battery device as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0075] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for example for convenience of description.

[0076] Please refer to Figure 1 , Figure 1 A structural schematic diagram of the vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100. The battery device 100 can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0077] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Please refer to Figure 2 , Figure 2 A perspective exploded structural schematic diagram of the battery device 100 is provided for some embodiments of the present application. The battery device 100 includes a battery box 20 and a battery cell 10. The battery cell 10 is accommodated in the battery box 20. The battery box 20 can accommodate the battery cell 10 and can be used for protection of the battery cell 10. The structural form of the battery box 20 can be various.

[0079] In some embodiments, the battery box 20 can include a first part 21 and a second part 22 which are covered with each other. The first part 21 can be a hollow structure with one end open, so that an accommodation space 30 for accommodating the battery cell 10 is formed in the first part 21. The second part 22 can also be a hollow structure with one end open. The open end of the first part 21 is covered with the open end of the second part 22.

[0080] In other embodiments, the first part 21 can be a hollow structure with one open end, and the second part 22 can be a plate-shaped structure covering the open end of the first part 21.

[0081] Of course, the battery case 20 formed by the second part 22 and the first part 21 can have various shapes, such as a cylinder, a cuboid, etc.

[0082] In the battery device 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. Specifically, the battery cell 10 can be a battery monomer or a battery module. The battery module means a module component formed by assembling multiple battery monomers.

[0083] In a specific embodiment, the multiple battery monomers can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery monomers can be accommodated in the case. Of course, the battery device 100 can also be in a form that the multiple battery monomers are connected in series, in parallel, or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the case. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery monomers.

[0084] Each battery monomer can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery monomer can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0085] The following embodiments are described by taking a battery monomer as an example for convenience of description.

[0086] Please refer to Figure 3 and Figure 4 , Figure 3 the three-dimensional structure schematic diagram of the battery monomer 10 provided by some embodiments of the present application; Figure 4 the exploded structure schematic diagram of the battery monomer 10 provided by some embodiments of the present application.

[0087] The battery monomer means the smallest unit of the battery device 100. As shown in Figure 3 and Figure 4 , the battery monomer includes a shell 11, an electrode assembly 12, and other functional components.

[0088] The shell 11 includes an end cover 111 and a shell body 112.

[0089] The end cover 111 refers to a component that covers the opening of the shell 112 to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cover 111 can be adapted to the shape of the shell 112 to fit the shell 112. Optionally, the end cover 111 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 111 is less likely to deform when subjected to extrusion collision, allowing the battery cell to have higher structural strength and improved safety performance. The end cover 111 can be provided with functional components such as the electrode terminal 13. The electrode terminal 13 can be used to electrically connect with the electrode assembly 12 for outputting or inputting the electrical energy of the battery cell. In some embodiments, the end cover 111 can also be provided with a pressure relief structure 14 for relieving the internal pressure of the battery cell when the internal pressure or temperature reaches a threshold value. The material of the end cover 111 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specifically limited in the embodiments of the present application. In some embodiments, an insulating member can also be provided on the inner side of the end cover 111, which can be used to isolate the electrical connection components in the shell 11 from the end cover 111 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0090] The shell 112 is a component for fitting the end cover 111 to form the internal environment of the battery cell, wherein the formed internal environment can be used to accommodate the electrode assembly 12, electrolyte and other components. The shell 112 and the end cover 111 can be independent components, and an opening can be provided on the shell 112, and the end cover 111 is covered on the opening to form the internal environment of the battery cell. Without limitation, the end cover 111 and the shell 112 can also be integrated, specifically, the end cover 111 and the shell 112 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 112, the end cover 111 is covered on the shell 112. The shell 112 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 112 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specifically limited in the embodiments of the present application.

[0091] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell. One or more electrode assemblies 12 can be contained within the case 11. The electrode assembly 12 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 12, and portions without active materials that each constitute a tab 121. The tab 121 of the positive electrode and the tab 121 of the negative electrode can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs 121 connect to the electrode terminal 13 to form a current loop.

[0092] In a first aspect, embodiments of the present application provide a battery device 100, comprising a case and one or more battery cells 10 contained in the case. Referring to Figure 5 The case comprises a frame 31 and a bottom plate 32.

[0093] The frame 31 is made of metal, which is combined Figure 6 It can be understood that the frame 31 is provided with a support portion 311, at least a part of the support portion 311 is located on the inner side of the frame 31.

[0094] The bottom plate 32 is located on the inner side of the frame 31, the bottom plate 32 is abutted on the support portion 311 and connected with the support portion 311, the frame 31 and the bottom plate 32 enclose a containing space 30 for containing the battery cell 10. The bottom plate 32 comprises a first composite layer 41, a metal layer 43 and a second composite layer 44, the first composite layer 41 is arranged on the side of the metal layer 43 facing the containing space 30, and the second composite layer 44 is arranged on the side of the metal layer 43 facing away from the containing space 30.

[0095] The case is a component for containing the battery cell 10. Specifically, the case can be the first part 21 described above, and can be used in combination with the second part 22 of the battery case 20. Alternatively, the case can also be used alone, and the specific use mode thereof can be reasonably selected according to actual needs, which is not limited herein.

[0096] The battery cell 10 refers to a unit capable of storing and releasing electric energy; one or more battery cells 10 can be contained in the case, and the specific number thereof can be selected according to actual needs, which is not limited herein. Optionally, the battery cell 10 can be a battery cell or a battery module, wherein the battery module refers to a module component formed by assembling a plurality of battery cells.

[0097] The frame 31 refers to an annular frame component for surrounding the outer circumferential side of the battery cell 10. For example, the frame 31 can be a closed annular structure formed by sequentially connecting a plurality of frame strips made of metal or composite material. The frame strips can be connected by welding, clamping, screwing, or the like. The number of frame strips can be three, four, or more than five, and the specific number can be determined according to the shape of the frame 31, which is not limited herein. Alternatively, the frame 31 can be an integrated structure formed in one piece.

[0098] The bottom plate 32 is a plate-shaped component located at the bottom of the box. It can be used to support the battery cell 10 and also to resist the impact of the bottom of the box to provide protection for the battery cell 10. Specifically, the bottom plate 32 can be a square plate, a triangular plate, a circular plate, or the like. The specific shape of the bottom plate 32 can be selected according to actual design needs, which is not limited herein.

[0099] The support part 311 refers to a component connected to the frame 31 and capable of supporting the bottom plate 32.

[0100] The bottom plate 32 is a multi-layer structure including a first composite layer 41, a metal layer 43, and a second composite layer 44.

[0101] The first composite layer 41 and the second composite layer 44 both refer to structural layers formed of composite material. The material of the first composite layer 41 and the material of the second composite layer 44 can be the same or different. The wall thickness of the first composite layer 41 and the wall thickness of the second composite layer 44 can be the same or different. It can be understood that the composite material forms the first composite layer 41 and the second composite layer 44, which has high structural strength and higher insulation and lighter weight compared to metal materials.

[0102] The metal layer 43 can be a structural layer formed of metal material and can resist the impact of the bottom of the box.

[0103] The battery device 100 of the present application has high structural strength, better insulation, and lighter weight compared to metal. By providing the bottom plate 32 including the first composite layer 41 and the second composite layer 44 and the metal layer 43 between the first composite layer 41 and the second composite layer 44, the metal material of the bottom plate 32 can be reduced under the premise of meeting the structural strength requirement of the bottom plate 32, thereby achieving the thinning and lightening of the bottom plate 32. This is conducive to improving the volume of the box and reducing the weight of the box and the battery device 100, and is conducive to improving the insulation of the bottom plate 32 and the battery cell 10 in the accommodation space 30 and reducing the risk of sparking.

[0104] In this embodiment, since the base plate 32 has a multi-layer structure and the metal layer 43 of the base plate 32 is built between the first composite layer 41 and the second composite layer 44, in order to achieve the assembly between the metal frame 31 and the base plate 32 with the metal layer 43 built in, a support portion 311 is provided on the frame 31. At least a part of the support portion 311 is located inside the frame 31, and the base plate 32 is located inside the frame 31, resting on and connected to the support portion 311. By supporting the base plate 32 with the support portion 311, the base plate 32 is less likely to leak out from the bottom of the frame 31, thereby reducing the risk of the base plate 32 and the frame 31 becoming loose. This solves the problem that the base plate 32 and the frame 31, which are made of different materials, are difficult to connect firmly. Furthermore, by using the support portion to support the base plate 32, the load-bearing capacity of the base plate 32 can be further improved, thereby further promoting the thinning of the base plate 32 and improving the problem of the large weight of the box and battery device 100.

[0105] In another embodiment of this application, combined with Figure 6 As shown, optionally, the support portion 311 extends toward the interior of the frame 31. When the base plate 32 is placed inside the frame 31, the edge of the base plate 32 rests on the support portion 311, so that the base plate 32 is supported by the support portion 311.

[0106] In another embodiment of this application, optionally, the support 311 and the frame 31 can be an integral structure made by integral casting, integral extrusion molding or 3D printing, or they can be separate parts connected together by welding, snap-fit ​​or other connection methods.

[0107] Optionally, the support portion 311 can be configured as follows: Figure 6 The plate shape shown makes the wall thickness of the support portion 311 smaller than its width and length, thus saving on the height of the housing and increasing the energy storage density of the battery device 100. Of course, in other embodiments, the support portion 311 can also be configured as a block structure, etc.

[0108] Optionally, the support 311 is located at the bottom of the frame 31, which can help reduce the height of the enclosure.

[0109] In another embodiment of this application, optionally, the portion of the base plate 32 that rests against the support portion 311 is fixedly connected to the support portion 311.

[0110] For example, such as Figure 6 As shown, the portion of the base plate 32 that rests against the support portion 311 is connected to the support portion 311 via the first connector 23. This improves the overall structural strength and reliability of the enclosure.

[0111] Specifically, the first connecting member 23 penetrates the support portion 311 and the bottom plate 32 along the thickness direction of the bottom plate 32, and connects and fixes the support portion 311 and the bottom plate 32 together. Optionally, the first connecting member 23 can be a cored rivet or a pull rivet nut.

[0112] Optionally, a plurality of first connecting members 23 are arranged at intervals on the support portion 311, so as to connect and fix the support portion 311 and the edge of the bottom plate 32 through the plurality of first connecting members 23 arranged at intervals. In this way, the structural strength of the box body can be further improved.

[0113] Of course, the present application is not limited thereto, and in other embodiments, the support portion 311 and the bottom plate 32 can also be bonded and / or clamped.

[0114] In another embodiment of the present application, as shown in Figure 7 , the support portion 311 is provided with a support surface 312 for supporting the bottom plate 32, and the edge of the bottom plate 32 is lapped on the support surface 312, wherein a first sealing layer 313 is arranged between the support surface 312 and the bottom plate 32. The gap between the bottom plate 32 and the support portion 311 can be sealed by the first sealing layer 313, thereby reducing the risk of water leakage at the position between the bottom plate 32 and the support portion 311, and thus reducing the risk of water entering or soaking the battery cell 10.

[0115] Optionally, the first sealing layer can be a sealant layer. For example, the bottom plate 32 is placed on the support portion 311, sealant is applied on the surface of the edge of the bottom plate 32, and / or sealant is applied on the support surface 312 of the support portion 311. After the bottom plate 32 is placed on the support surface 312 of the support portion 311, the sealant is located between the bottom plate 32 and the support surface 312, and after the sealant solidifies, the first sealing layer located between the bottom plate 32 and the support surface 312 is formed.

[0116] In another embodiment of the present application, as shown in Figure 6 , the edge of the side of the bottom plate 32 opposite to the accommodation space 30 is provided with a groove 47, and the support portion 311 is located in the groove 47. By cooperating the groove 47 and the support portion 311, the positioning effect between the bottom plate 32 and the frame 31 can be improved, the assembly efficiency between the bottom plate 32 and the frame 31 can be improved, and at the same time, the bottom surface of the support portion 311 and the bottom surface of the bottom plate 32 can be kept at substantially the same horizontal plane, thereby improving the regularity of the bottom surface of the box body, reducing the risk of scratching caused by the local outward protrusion of the support portion 311, and facilitating the reduction of the overall height of the box body.

[0117] In another embodiment of the present application, referring to Figure 6 , the bottom plate 32 further comprises a heat exchange component layer 42.

[0118] The heat exchange component layer 42 is arranged on the side of the metal layer 43 close to the accommodation space 30, the first composite material layer 41 is arranged on the side of the heat exchange component layer 42 away from the metal layer 43, and the second composite material layer 44 is arranged on the side of the metal layer 43 away from the heat exchange component layer 42.

[0119] The heat exchange component layer 42 can be a structural layer formed by a heat exchange component having a heat exchange function, wherein the heat exchange component having the heat exchange function can be understood as a component capable of dissipating or heating the battery cell 10 through a heat exchange mode.

[0120] In the embodiment of the present application, the bottom plate 32 comprises the heat exchange component layer 42, so that the bottom plate 32 has a heat management function, thereby reducing the occupation of the heat management component to the accommodation space 30, saving the volume of the box, and achieving the weight reduction of the box. The heat exchange component layer 42 is arranged on the side of the metal layer 43 close to the accommodation space 30, and the metal layer 43 can be used to protect the heat exchange component layer 42 and the battery cell 10 in the accommodation space 30, thereby reducing the risk of the heat exchange component layer 42 and the battery cell 10 being pierced by external sharp objects. The side of the heat exchange component layer 42 away from the metal layer 43 is provided with the first composite material layer 41, and the side of the metal layer 43 away from the heat exchange component layer 42 is provided with the second composite material layer 44. The first composite material layer 41 and the second composite material layer 44 of the composite material have high structural strength, and are better insulated and lighter than the metal structure. By using the structural layout that the heat exchange component layer 42 and the metal layer 43 are located between the first composite material layer 41 and the second composite material layer 44, the insulation between the heat exchange component layer 42 and the battery cell 10 can be improved, and the risk of the battery cell 10 sparking can be reduced. In addition, the overall structural rigidity of the bottom plate 32 is improved, and the overall weight of the bottom plate 32 is reduced, thereby promoting the lightweight of the battery device 100, improving the problem of the heavy weight of the battery device 100, so that the battery device 100 can be applied to occasions with high weight requirements, and the weight of the power utilization device or energy storage device using the battery device 100 is also improved.

[0121] In another embodiment of the present application, optionally, at least a part of the heat exchange component layer 42 is arranged apart from the metal layer 43; and the bottom plate 32 further comprises a buffer layer 45, and the buffer layer 45 is arranged between the heat exchange component layer 42 and the metal layer 43. Figure 6 By arranging the buffer layer 45 between the heat exchange component layer 42 and the metal layer 43, the buffer layer 45 can simultaneously buffer and protect the heat exchange component layer 42.

[0122] In another embodiment of the present application, the buffer layer 45 comprises a combination of one or more of structural foam and structural rubber.

[0123] The structural foam refers to a structure with a large number of micropores inside. The structural foam has low density, light weight, good buffering and energy absorption effects, and is conducive to the lightweight of the battery device 100. Moreover, the structural foam itself has a very low thermal conductivity coefficient, and the structural foam can simultaneously insulate the heat exchange component layer 42, reduce the cold and heat loss of the heat exchange component layer 42, and improve the thermal management efficiency of the bottom plate 32 on the battery cell 10.

[0124] Optionally, the structural foam can specifically use polyurethane, epoxy, and other thermosetting foams. Alternatively, PA (Polyamide), PPE (Polyphenylene ether), and other thermoplastic foams can also be used.

[0125] The structural rubber is a component of rubber material, and the material itself has elasticity. The structural rubber can be provided in a solid structure, or can also be provided in a hollow structure or a structural foam with holes inside. The structural rubber can well play the buffering and energy absorption effects, thereby improving the impact resistance and extrusion resistance of the bottom plate. Moreover, the density of the structural rubber is lower than that of metal, and the thermal conductivity coefficient is lower than that of metal, so that the lightweight of the battery device and the insulation effect of the heat exchange component layer can be simultaneously considered.

[0126] In another embodiment of the present application, referring to Figure 9 , the battery device 100 further comprises a structural beam 25. In combination with Figure 10 and Figure 11 It can be understood that the structural beam 25 is arranged in the accommodation space 30, and the bottom plate 32 is provided with a through connecting hole 46, and the second connecting piece 24 is arranged in the connecting hole 46, and the bottom plate 32 is connected to the structural beam 25 through the second connecting piece 24. By using the second connecting piece 24 to connect the bottom plate 32 to the structural beam 25, the structural rigidity of the box body can be further improved.

[0127] The structural beam 25 refers to a component for strengthening the structural strength and rigidity of the box body. The structural beam 25 is arranged in the accommodation space 30, thereby also being used to separate the accommodation space 30 in the box body.

[0128] Optionally, the second connecting piece 24 can specifically use a sealing rivet screw.

[0129] In another embodiment of the present application, the connecting hole 46 comprises a first hole on the metal layer 43, a second hole on the heat exchange component layer 42, a third hole on the second composite layer 44, and a fourth hole on the first composite layer 41, the first hole, the second hole, the third hole, and the fourth hole are axially arranged and communicated, so that the second connecting member 24 passes through the first hole, the second hole, the third hole, and the fourth hole, thereby penetrating through the entire bottom plate 32 along the thickness direction of the bottom plate 32.

[0130] Optionally, the first hole, the second hole, the third hole, and the fourth hole can be a one-time forming structure, for example, after the bottom plate 32 is formed into a multi-layer structure comprising the first composite layer 41, the second composite layer 44, the heat exchange component layer 42, and the metal layer 43, the connecting hole 46 can be formed by one-time stamping, so that the first hole, the second hole, the third hole, and the fourth hole are one-time stamped. Alternatively, the first hole, the second hole, the third hole, and the fourth hole can be a multi-time forming structure, the metal layer 43 with the first hole, the heat exchange component layer 42 with the second hole, the second composite layer 44 with the third hole, and the first composite layer 41 with the fourth hole are stacked together, and the first hole, the second hole, the third hole, and the fourth hole are axially corresponding, so that the first hole, the second hole, the third hole, and the fourth hole are axially corresponding to jointly form the connecting hole 46.

[0131] In the above embodiment, the metal layer 43 is partially arranged as a first recessed groove portion 431 which is recessed towards the heat exchange component layer 42, the buffer layer 45 is provided with a through avoiding through hole 451, the first recessed groove portion 431 passes through the avoiding through hole 451 and is arranged opposite to the heat exchange component layer 42, the first hole is arranged in the first recessed groove portion 431, and the first hole is positionally corresponding to the second hole. Since the first hole is arranged in the first recessed groove portion 431, and the first recessed groove portion 431 passes through the avoiding through hole 451 and is arranged opposite to the heat exchange component layer 42, the first recessed groove portion 431 is avoided through the avoiding through hole 451, so that there is no buffer layer 45 between the metal layer 43 and the heat exchange component layer 42 at the connecting position of the bottom plate 32 and the structural beam 25 based on the second connecting member 24, which can reduce the torsional force attenuation at the connecting position, and further improve the connecting strength and reliability between the bottom plate 32 and the structural beam 25.

[0132] Correspondingly, at least a portion of the heat exchange component layer 42 is spaced apart from the metal layer 43 and filled with the buffer layer 45 at the spacing position, and the at least a portion of the heat exchange component layer 42 can be understood as the portion of the heat exchange component layer 42 which is arranged opposite to the avoiding through hole 451.

[0133] In another embodiment of the present application, in combination with Figure 10 and Figure 11It can be understood that the second composite layer 44 is provided with a second groove portion 441 corresponding to the first groove portion 431, the second groove portion 441 is located in the first groove portion 431, and the connecting hole 46 further comprises a third hole in the second composite layer 44, the third hole is arranged in the second groove portion 441, the third hole is in position correspondence with the first hole, and the second connecting piece 24 is provided with an end portion 241, the end portion 241 is accommodated in the second groove portion 441.

[0134] By accommodating the end portion 241 of the second connecting piece 24 in the second groove portion 441, the end portion 241 of the second connecting piece 24 can be avoided to protrude from the lower surface of the bottom plate 32 or the protruding height of the end portion 241 of the second connecting piece 24 relative to the lower surface of the bottom plate 32 is reduced, which is beneficial to reduce the risk of scratching caused by the local protrusion of the second connecting piece 24 and reduce the overall height of the box body, thereby improving the energy storage density of the battery device 100.

[0135] In another embodiment of the present application, a second sealing layer 443 is further arranged in the second groove portion 441. Figure 12 As shown in the drawings, the second sealing layer 443 can be filled in the second groove portion 441, and the second sealing layer 443 encapsulates the end portion 241 in the second groove portion 441. In this way, the risk of water leakage at the connecting position of the bottom plate 32 and the structural beam 25 can be reduced, thereby reducing the risk of water entering or soaking the battery cell 10.

[0136] Optionally, the second sealing layer 443 can be a sealing glue layer. For example, after the second connecting piece 24 is arranged in the connecting hole 46, sealing glue is applied to the second groove portion 441, and the second sealing layer 443 is formed in the second groove portion 441 after the sealing glue solidifies, and the second sealing layer 443 encapsulates the end portion 241 in the second groove portion 441.

[0137] Alternatively, in other embodiments, for example Figure 13 As shown in the drawings, the second sealing layer can also be arranged on the surface of the second groove portion 441, and a part of the second sealing layer 443 is filled between the end portion 241 and the second groove portion 441. In this way, the second sealing layer 443 is used to fill the gap between the end portion 241 and the second groove portion 441, so as to reduce the risk of water leakage at the connecting position of the bottom plate 32 and the structural beam 25, thereby reducing the risk of water entering or soaking the battery cell 10. Optionally, the second sealing layer 443 can be a sealing glue layer. For example, before the second connecting piece 24 is arranged in the connecting hole 46, sealing glue is applied to the surface of the second groove portion 441. In this way, after the second connecting piece 24 is arranged in the connecting hole 46, a part of the second sealing layer 443 will be filled between the end portion 241 and the second groove portion 441, so as to seal the gap between the end portion 241 and the second groove portion 441.

[0138] In another embodiment of the present application, the heat exchange component layer 42 can adopt a water-cooled plate. Specifically, as shown in Figure 11 The heat exchange component layer 42 includes a first plate body 421 and a second plate body 422 arranged oppositely, the second plate body 422 is arranged on the side of the first plate body 421 away from the first composite layer 41, the second plate body 422 is provided with first recesses 423 and second recesses 424 arranged alternately, the first recesses 423 are recessed away from the first plate body 421, and the first recesses 423 and the first plate body 421 enclose flow channels 425, and the second recesses 424 abut the first plate body 421 to separate adjacent flow channels 425. Among them, the flow channels 425 enclosed by the first recesses 423 and the first plate body 421 can be used for water and other heat carrying media to flow through, so as to efficiently cool or heat the battery cell 10 by using the heat carrying medium, improve the thermal management efficiency of the battery cell 10, and reduce the risk of swelling failure of the battery cell 10.

[0139] In another embodiment of the present application, as shown in Figure 11 The first recessed part 431 is recessed towards the second recessed part 424 and extends into the second recessed part 424, and the second hole includes a first sub-hole on the first plate body 421 and a second sub-hole in the second recessed part 424, and the first sub-hole and the second sub-hole are in position corresponding to the first hole. By recessing the first recessed part 431 towards the second recessed part 424 and extending into the second recessed part 424, and setting the second sub-hole in the second recessed part 424, the connection position of the bottom plate 32 and the structural beam 25 based on the second connecting piece 24 can avoid the flow channel 425, which on the one hand reduces the influence on the flow area of the heat exchange component layer 42, and on the other hand, the connection position is provided with the avoiding hole 451 of the buffer layer 45, by avoiding the flow channel 425 at the connection position, it also reduces the heat loss of the heat exchange component layer 42, and at the same time, it also utilizes the second connecting piece 24 to further strengthen the connection reliability between the first plate body 421 and the second plate body 422.

[0140] Optionally, the first plate body 421 and the second plate body 422 can be formed by integral brazing process. Alternatively, an aluminum plastic film can be used as the second plate body 422, and the second plate body 422 is formed by hot pressing adhesion with the first plate body 421.

[0141] Optionally, as shown in Figure 8 Two water inlet and outlet ports 426 are arranged on the first plate body 421 and communicate with the flow channels 425, and two avoiding ports 411 are arranged on the first composite layer 41, and the two avoiding ports 411 and the two water inlet and outlet ports 426 are arranged one by one.

[0142] In another embodiment of the present application, the first composite layer 41 comprises fibers and a matrix attached to the fibers; and / or the second composite layer 44 comprises fibers and a matrix attached to the fibers. The first composite layer 41 and / or the second composite layer 44 comprises fibers and a matrix attached to the fibers, which improves the strength of the first composite layer 41 and / or the second composite layer 44 while making the density of the first composite layer 41 and / or the second composite layer 44 smaller, thereby improving the weight reduction effect on the battery device 100.

[0143] Optionally, the fibers contained in the first composite layer 41 and / or the second composite layer 44 can be continuous fibers, and the fibers can specifically be one or more of a combination of glass fibers, carbon fibers, and basalt fibers. The matrix contained in the first composite layer 41 and / or the second composite layer 44 can be resin, and the matrix can specifically be one or more of a thermosetting resin such as polyurethane or epoxy resin, or one or more of a thermoplastic resin such as nylon or polypropylene.

[0144] In another embodiment of the present application, the first composite layer 41 comprises a first composite skin, the first composite skin is arranged on the side of the metal layer 43 facing the accommodation space 30, and the first composite skin forms the surface of the bottom plate 32 arranged towards the accommodation space 30. That is, the first composite skin is used as the surface of the bottom plate 32 arranged towards the accommodation space 30.

[0145] And / or, the second composite layer 44 comprises a second composite skin, the second composite skin is arranged on the side of the metal layer 43 facing away from the accommodation space 30, and the second composite skin forms the surface of the bottom plate 32 arranged away from the accommodation space 30. That is, the second composite skin is used as the surface of the bottom plate 32 arranged away from the accommodation space 30.

[0146] The skin in the first composite skin and / or the second composite skin refers to a component for covering the surface of the core material to strengthen the strength and rigidity of the whole core material by using the rigidity and strength of the skin itself.

[0147] The composite skin in the first composite skin and / or the second composite skin refers to a skin of a composite material.

[0148] The first composite skin is used to form the surface of the bottom plate 32 arranged towards the accommodation space 30, and / or the second composite skin is used to form the surface of the bottom plate 32 arranged away from the accommodation space 30. The composite skin has the characteristics of thin thickness, high strength, and light weight, which can better meet the light and thin requirements and high strength requirements of the bottom plate 32. The inner layer structure of the bottom plate 32, such as the heat exchange component layer 42 and the metal layer 43, is used as the core material, and the inner layer structure of the bottom plate 32, such as the heat exchange component layer 42 and the metal layer 43, is covered by the composite skin to form an integrated bottom plate 32, which helps to further improve the structural strength and stability of the whole bottom plate 32.

[0149] Further optionally, the skin of the composite material can be selected from fiber-reinforced composite material, such as continuous fiber-reinforced composite material, etc. The fiber-reinforced composite material can include fibers and a matrix attached to the fibers. The fibers of the fiber-reinforced composite material can be continuous fibers, and the fibers of the fiber-reinforced composite material can be selected from one or more of glass fibers, carbon fibers, basalt fibers, etc. The matrix of the fiber-reinforced composite material can be a resin, and the matrix can be selected from one or more of thermosetting resins, such as polyurethane, epoxy resin, etc., or one or more of thermoplastic resins, such as nylon, polypropylene, etc.

[0150] In another embodiment of the present application, referring to Figure 6 , the edge of the second composite layer 44 is arranged as a second edge wrapping structure 442, and the second edge wrapping structure 442 extends to the edge of the first composite layer 41. By arranging the edge of the bottom plate 32 as the second edge wrapping structure 442, the edge of the bottom plate 32 can be covered by the second composite layer 44, and the structural strength and insulation of the entire bottom plate 32 can be further improved.

[0151] Of course, in other embodiments, the edge of the first composite layer 41 can be arranged as a first edge wrapping structure, and the first edge wrapping structure extends to the edge of the second composite layer 44. By arranging the edge of the bottom plate 32 as the first edge wrapping structure of the first composite layer 41, the edge of the bottom plate 32 can be covered by the first composite layer 41, and the structural strength and insulation of the entire bottom plate 32 can be further improved.

[0152] In another embodiment of the present application, the buffer layer 45 can be foamed and formed between the metal layer 43 and the heat exchange component layer 42, so that the metal layer 43, the heat exchange component layer 42, and the buffer layer 45 are connected as a first whole, the first whole is located between the first composite layer 41 and the second composite layer 44, and the first whole is integrally molded with the first composite layer 41 and the second composite layer 44, or the first whole is molded with the first composite layer 41 and the second composite layer 44, respectively.

[0153] In another embodiment of the present application, the heat exchange component layer 42 and the first composite layer 41 are bonded or integrally molded as a second whole, the metal layer 43 and the second composite layer 44 are bonded or integrally molded as a third whole, and the buffer layer 45 is foamed and formed between the second whole and the third whole.

[0154] In another embodiment of the present application, the metal layer 43 can be selected from one or more of a combination of a steel layer and an aluminum layer.

[0155] In a specific embodiment of the present application, referring to Figure 5 , the battery device 100 includes a bottom plate 32 and a frame 31, and the bottom plate 32 and the frame 31 enclose a receiving space 30 for receiving the battery cell 10.

[0156] Referring to Figure 6 The accommodation space 30 is located above a bottom plate 32, and the bottom plate 32 is a multi-layer composite structure, which sequentially comprises, from top to bottom, a first composite layer 41, a heat exchange component layer 42, a buffer layer 45, a metal layer 43, and a second composite layer 44. The first composite layer 41 can be a first composite skin, and the second composite layer 44 can be a second composite skin. The heat exchange component layer 42 can be a water-cooled plate. The bottom plate 32 with the multi-layer composite structure can achieve protection of the bottom of the box body, while integrating different functional requirements such as heat management and insulation, thereby saving the space of the bottom of the box body and improving the overall structural rigidity of the bottom plate 32.

[0157] The first composite skin and the second composite skin are both continuous fiber reinforced composite materials. The resin of the fiber reinforced composite material can be a thermosetting resin such as polyurethane or epoxy resin, or a thermoplastic resin such as nylon or polypropylene. The fiber can be selected from glass fiber, carbon fiber, or basalt fiber, etc. By covering the first composite skin and the second composite skin, the multi-layer structure of the bottom plate 32 is combined into a whole, thereby improving the overall structural strength of the bottom plate 32.

[0158] The water-cooled plate comprises a first plate body 421 and a second plate body 422 located below the first plate body 421. The first plate body 421 and the second plate body 422 can be formed by an integral brazing process. Alternatively, in other embodiments, the second plate body 422 can be replaced by an aluminum plastic film, which is formed by being combined with the first plate body 421 through hot pressing adhesion.

[0159] The buffer layer 45 is a structural foam, which can be selected from a thermosetting foam such as polyurethane or epoxy. The buffer layer 45 can also be formed by foaming a thermoplastic material such as PA or PPE. Under the impact working condition of the bottom of the box body, the buffer layer 45 can provide a buffering and energy-absorbing effect to protect the internal water-cooled plate and the battery cell 10 in the accommodation space 30.

[0160] The metal layer 43 is made of steel or aluminum and is located below the buffer layer 45, which can reduce the risk of external sharp objects piercing the water-cooled plate or the battery cell 10 and improve the protection effect.

[0161] By the first composite skin and the second composite skin, the internal water-cooled plate, the buffer layer 45, and the metal layer 43 are combined into a whole bottom plate 32 with a sandwich structure, thereby improving the overall structural rigidity of the bottom plate 32. By being built-inly covered between the first composite skin and the second composite skin, the water-cooled plate solves the insulation problem between the water-cooled plate and the battery cell 10. Meanwhile, the buffer layer 45 at the bottom of the water-cooled plate can better protect the internal water-cooled plate under the external impact working condition, and the foaming material of the buffer layer 45 itself has a very low thermal conductivity, which can achieve a good heat preservation effect.

[0162] A support portion 311 is provided at the bottom of the frame 31, and the edge of the base plate 32 is located on the support portion 311. Utilizing the support portion 311 of the frame 31 as a bottom support structure provides excellent support for the base plate 32, improving the overall structural reliability of the enclosure. The edge of the base plate 32 is fixedly connected to the support portion 311 by a first connector 23 (such as a pop rivet or a sealing rivet screw). This further enhances the structural rigidity of the enclosure.

[0163] Optionally, the edge of the base plate 32 is fixedly connected to the support portion 311 by a plurality of spaced-apart first connectors 23. By setting the fixing area between the base plate 32 and the frame 31 on the support portion 311, and fixing the support portion 311 to the edge of the base plate 32 by a plurality of spaced-apart first connectors 23, the structural strength and reliability of the enclosure can be further improved.

[0164] Optionally, a first sealing layer is provided between the contact surfaces of the support 311 and the base plate 32. The first sealing layer may be a sealant layer to improve the sealing reliability of the enclosure.

[0165] like Figure 9 and Figure 10 As shown, the battery device 100 also includes a structural beam 25, which is located inside the housing. The structural beam 25 is connected to the bottom plate 32 by a second connector 24 (such as a sealing rivet nut), which further improves the structural rigidity of the housing.

[0166] like Figure 11 As shown, the connection area where the structural beam 25 and the base plate 32 are connected by the second connector 24 eliminates the buffer layer 45 of the base plate 32. Specifically, a clearance through hole 451 is provided on the buffer layer 45, and the position of the clearance through hole 451 corresponds to the connection position where the structural beam 25 and the base plate 32 are connected by the second connector 24. The first groove portion 431 of the metal layer 43 passes through the clearance through hole 451 and is recessed towards the heat exchange component layer 42, so that the buffer layer 45 at this connection area is eliminated, which can avoid the problem of torque attenuation and improve the connection firmness of the second connector 24 to the structural beam 25 and the base plate 32. At the same time, a second groove portion 441 is formed on the second composite layer 44. The second groove portion 441 corresponds to the first groove portion 431. The end portion 241 of the second connector 24 is located in the second groove portion 441. In this way, the end portion 241 of the second connector 24 will not protrude from the lower surface of the base plate 32, which can reduce the risk of scratching the bottom of the box and reduce the height dimension of the box. A second sealing layer can be formed in the second groove 441 by applying adhesive, which can improve the sealing reliability at the connection point between the base plate 32 and the structural beam 25.

[0167] An embodiment of the second aspect of this application provides a housing, which can be referred to Figure 5and Figure 6 The box includes a frame 31 and a bottom plate 32.

[0168] The frame 31 is made of metal, and the frame 31 is combined with the bottom plate 32. Figure 6 It can be understood that the frame 31 is provided with a support portion 311, and at least a part of the support portion 311 is arranged on the inner side of the frame 31.

[0169] The bottom plate 32 is arranged on the inner side of the frame 31, and the edge of the bottom plate 32 is abutted on and connected with the support portion 311, and the frame 31 and the bottom plate 32 enclose a containing space 30 for containing the battery cell 10. The bottom plate 32 includes a first composite layer 41, a metal layer 43 and a second composite layer 44, the first composite layer 41 is arranged on the side of the metal layer 43 facing the containing space 30, and the second composite layer 44 is arranged on the side of the metal layer 43 facing away from the containing space 30.

[0170] The box is a component for containing the battery cell 10. Specifically, the box can be the first part 21 described above, and can be used in combination with the second part 22 of the battery box 20. Alternatively, the box can be used alone, and the specific use mode can be reasonably selected according to actual needs, which is not limited here.

[0171] The frame 31 and the associated structure between the frame 31 and the bottom plate 32 at this point can be understood with reference to the frame 31 and the associated structure between the frame 31 and the bottom plate 32 in the embodiment of the battery device 100 without conflict, which is not repeated here.

[0172] The box of the embodiment has a high structural strength, better insulation and lighter weight compared to metal. By arranging the bottom plate 32 to include the first composite layer 41 and the second composite layer 44 and the metal layer 43 between the first composite layer 41 and the second composite layer 44, the metal material of the bottom plate 32 can be reduced under the premise of meeting the structural strength requirement of the bottom plate 32, thereby achieving the thinning and weight reduction of the bottom plate 32, which is beneficial to improving the volume of the box and reducing the weight of the box, and is beneficial to improving the insulation of the bottom plate 32 and the battery cell 10 in the containing space 30 and reducing the risk of sparking.

[0173] In the embodiment, the support portion 311 is arranged on the frame 31, at least a part of the support portion 311 is located in the frame 31, the bottom plate 32 is located in the frame 31, the bottom plate 32 is clamped on the support portion 311 and connected with the support portion 311. The bottom plate 32 is supported by the support portion 311, so that the bottom plate 32 is not easy to leak from the bottom of the frame 31, thereby reducing the risk of loosening between the bottom plate 32 and the frame 31, solving the problem that the bottom plate 32 and the frame 31 with different materials are difficult to be firmly connected, and supporting the bottom plate 32 by the support portion can further improve the bearing capacity of the bottom plate 32, thereby further promoting the lightness and thinness of the bottom plate 32 and improving the problem of large weight of the box body.

[0174] The energy storage device provided by the embodiment of the third aspect of the present application comprises the battery device 100 in any one of the embodiments of the first aspect or the box body in any one of the embodiments of the second aspect.

[0175] Since the energy storage device comprises the battery device 100 or the box body, the battery device 100 or the box body has lighter weight and reliable structural strength, so that the energy storage device has lighter weight and reliable structural strength.

[0176] The power consumption device provided by the embodiment of the fourth aspect of the present application comprises the battery device 100 in any one of the embodiments of the first aspect or the box body in any one of the embodiments of the second aspect.

[0177] Since the power consumption device comprises the battery device 100 or the box body, the battery device 100 or the box body has lighter weight and reliable structural strength, so that the power consumption device has lighter weight and reliable structural strength.

[0178] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0179] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized by, The battery device includes a case and one or more battery cells accommodated in the case, and the case includes: a frame, the frame being made of metal, the frame being provided with a support portion, at least a portion of the support portion being provided on an inner side of the frame; a bottom plate provided on the inner side of the frame, the bottom plate being abutted on the support portion and connected with the support portion, the frame and the bottom plate enclosing an accommodation space for accommodating the battery cells, the bottom plate including a first composite layer, a metal layer, and a second composite layer, the first composite layer being provided on a side of the metal layer facing the accommodation space, and the second composite layer being provided on a side of the metal layer facing away from the accommodation space.

2. The battery device according to claim 1, wherein the portion of the bottom plate abutted on the support portion is connected to the support portion by a first connecting member.

3. The battery device according to claim 1 or 2, wherein the support portion is provided with a support surface for supporting the bottom plate, and the bottom plate is abutted on the support surface, and a first sealing layer is provided between the support surface and the bottom plate.

4. The battery device according to claim 1 or 2, wherein a groove is provided at an edge of the side of the bottom plate facing away from the accommodation space, and the support portion is located in the groove.

5. The battery device according to claim 1 or 2, characterized by The bottom plate further includes: a heat exchange component layer provided on a side of the metal layer close to the accommodation space, and the first composite layer is provided on a side of the heat exchange component layer facing away from the metal layer.

6. The battery device according to claim 5, wherein at least a portion of the heat exchange component layer is spaced apart from the metal layer; the bottom plate further includes a buffer layer, and the heat exchange component layer and the metal layer are spaced apart by the buffer layer.

7. The battery device according to claim 6, wherein the buffer layer includes a combination of one or more of structural foam and structural rubber.

8. The battery device of claim 6, wherein, The battery device further includes: a structural beam provided in the accommodation space, a connecting hole is provided through the bottom plate, a second connecting member is provided in the connecting hole, and the bottom plate is connected to the structural beam by the second connecting member.

9. The battery device according to claim 8, wherein the connecting hole includes a first hole in the metal layer and a second hole in the heat exchange component layer; a portion of the metal layer is provided as a first recessed groove portion recessed toward the heat exchange component layer, an avoiding through hole is provided through the buffer layer, the first recessed groove portion is provided opposite to the heat exchange component layer through the avoiding through hole, the first hole is provided in the first recessed groove portion, and the first hole is positionally corresponding to the second hole.

10. The battery device according to claim 9, wherein a portion of the second composite layer corresponding to the first recessed groove portion is provided as a second recessed groove portion, the second recessed groove portion is located in the first recessed groove portion, the connecting hole further includes a third hole in the second composite layer, the third hole is provided in the second recessed groove portion, the third hole is positionally corresponding to the first hole, and the second connecting member is provided with an end portion, and the end portion is accommodated in the second recessed groove portion.

11. The battery device of claim 10, wherein the second groove portion further comprises a second sealing layer; the second sealing layer is filled in the second groove portion and encapsulates the end portion in the second groove portion; and / or a portion of the second sealing layer is filled between the end portion and the second groove portion.

12. The battery device of claim 9, wherein the heat exchange component layer comprises a first plate body and a second plate body arranged oppositely, the second plate body is arranged on a side of the first plate body away from the first composite layer, the second plate body comprises first recesses and second recesses arranged alternately, the first recesses are recessed away from the first plate body, and the first recesses and the first plate body enclose flow channels, the second recesses abut the first plate body to separate adjacent flow channels.

13. The battery device of claim 12, wherein the first groove portion is recessed towards the second recess and extends into the second recess, the second hole comprises a first sub-hole on the first plate body and a second sub-hole in the second recess, and the first sub-hole and the second sub-hole are in position corresponding to the first hole.

14. The battery device of claim 1 or 2, wherein the first composite layer comprises a first composite skin arranged on a side of the metal layer facing the accommodation space, and the first composite skin forms a surface of the bottom plate arranged towards the accommodation space; and the second composite layer comprises a second composite skin arranged on a side of the metal layer away from the accommodation space, and the second composite skin forms a surface of the bottom plate arranged away from the accommodation space.

15. The battery device of claim 1 or 2, wherein an edge of the first composite layer is arranged in a first wrapping structure, and the first wrapping structure extends to an edge of the second composite layer; or an edge of the second composite layer is arranged in a second wrapping structure, and the second wrapping structure extends to an edge of the first composite layer.

16. A case characterized by, comprising: a frame, a material of the frame is metal, and the frame is provided with a support portion, at least a portion of the support portion is arranged on an inner side of the frame; a bottom plate arranged on the inner side of the frame, the bottom plate is arranged on the support portion and connected with the support portion, the frame and the bottom plate enclose an accommodation space for accommodating a battery cell, and the bottom plate comprises a first composite layer, a metal layer, and a second composite layer, the first composite layer is arranged on a side of the metal layer facing the accommodation space, and the second composite layer is arranged on a side of the metal layer away from the accommodation space.

17. An energy storage device, characterized by comprising: the battery device of any one of claims 1 to 15; or the box of claim 16. comprising:

18. An electrical device, comprising: the battery device of any one of claims 1 to 15; or the box of claim 16. ​ ​

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