Battery device and electric equipment

Abstract

The utility model provides a battery device and electric equipment, and belongs to the technical field of batteries. The battery device comprises a plurality of single batteries and a battery box body, the battery box body forms a containing cavity used for containing the single batteries, the battery box body comprises a box body and a cover plate, and the cover plate is used for being matched with the box body to jointly define the containing cavity; the cover plate comprises a frame and a center plate, a center opening is formed in the frame, the frame is detachably connected with the box body, and the periphery of the center plate is fixedly connected with the frame to seal the center opening. According to the cover plate structure of the battery box body in the battery device, the mass of the cover plate can be effectively reduced, so that the mass of the battery device is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device and an electrical equipment. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] The battery device includes a plurality of battery cells and a battery box body. The plurality of battery cells are accommodated inside the battery box body. At present, the overall mass of the battery device is relatively large, increasing the mass of the entire electrical equipment, and thus also increasing the power consumption. Summary of the Utility Model

[0004] This application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of this application is to provide a battery device and an electrical equipment to reduce the mass of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device. The battery device includes a plurality of battery cells and a battery box body. The battery box body forms an accommodation cavity for accommodating the plurality of battery cells. The battery box body includes a box body main body and a cover plate. The cover plate is used to cooperate with the box body main body to jointly define the accommodation cavity; the cover plate includes a frame and a central plate. The frame is formed with a central opening and is detachably connected to the box body main body. The outer periphery of the central plate is fixedly connected to the frame to close the central opening.

[0006] In the technical solution of the embodiment of this application, by dividing the cover plate into two parts, namely the frame and the central plate, the two parts can be manufactured separately. For the separate manufacturing of the central plate, the process selection is more diversified. Compared with the integral injection molding of the entire cover plate, a thin-wall structure can be realized at the central part of the cover plate, reducing the usage amount of raw materials, thus reducing the mass of the central plate, and further reducing the mass of the entire cover plate; for the separate injection molding process of the frame, only the frame needs to be locked by the clamping force. Compared with the integral injection molding of the entire cover plate, it can also effectively reduce the requirement for the tonnage of the injection molding machine, reduce the manufacturing requirements, reduce the manufacturing difficulty and the manufacturing cost.

[0007] In some embodiments, the central plate includes a central portion and an annular portion surrounding the outer periphery of the central portion; the annular portion includes a first surface and a second surface oppositely arranged in the thickness direction of the central plate, and at least one of the first surface and the second surface overlaps at least partially with the frame and is lap-fixed. By dividing the central plate into two parts, namely the central portion and the annular portion, and providing the first surface and the second surface on the annular portion, it is possible to select lap-fixing with the first surface, or lap-fixing with the second surface, or lap-fixing with both the first surface and the second surface simultaneously according to the actual situation of the frame, and the selection of lap-fixing methods has high flexibility.

[0008] In some embodiments, the frame includes a side wall and a first mounting portion, the side wall defining a central opening; the first mounting portion is located on the side of the side wall close to the central opening, and at least part of the first mounting portion is stacked with the annular portion to achieve lap-fixing of the central plate and the frame. By dividing the frame into two parts, namely the side wall and the first mounting portion, using the first mounting portion as the part connected to the annular portion, and lap-fixing the first mounting portion and the annular portion in a stacked manner, the installation of the stacked structure is convenient, and the selection of the connection method has flexibility.

[0009] In some embodiments, the first mounting portion includes a first mounting plate and a second mounting plate spaced apart in the vertical direction, and at least part of the annular portion is clamped between the first mounting plate and the second mounting plate. By setting the structure of the first mounting portion as the first mounting plate and the second mounting plate spaced apart in the vertical direction and fixing the annular portion between the first mounting plate and the second mounting plate, the annular portion is limited in the vertical direction by the first mounting plate and the second mounting plate, effectively improving the stability of the connection between the central plate and the frame.

[0010] In some embodiments, the surface of the annular portion in contact with the first mounting portion has a first concave-convex structure, and the surface of the first mounting portion in contact with the annular portion has a second concave-convex structure, and the first concave-convex structure is used to engage with the second concave-convex structure. By respectively providing the first concave-convex structure and the second concave-convex structure on the surface of the annular portion and the surface of the first mounting portion, the contact area between the annular portion and the first mounting portion is effectively increased, and the first concave-convex structure and the second concave-convex structure are mutually limited to prevent movement, further improving the stability of the connection.

[0011] In some embodiments, the first concave-convex structure includes a plurality of convex teeth arranged in a first direction perpendicular to the surface of the side wall, and the second concave-convex structure includes a plurality of grooves arranged in the first direction, and the cross-sectional shape of the groove is adapted to the cross-sectional shape of the convex tooth. By respectively providing convex teeth and grooves on the surface of the annular portion and the surface of the first mounting portion, the contact area between the annular portion and the first mounting portion is effectively increased, and the convex teeth and the grooves are mutually limited to prevent movement, further improving the stability of the connection.

[0012] In some embodiments, the cross-sectional shape of the convex teeth is triangular, rectangular, or trapezoidal. By providing various shapes for the cross-section of the convex teeth, the appropriate cross-sectional shape of the convex teeth can be selected according to requirements to improve the stability of the connection between the central plate and the frame.

[0013] In some embodiments, the convex teeth include an intersecting first tooth surface and a second tooth surface. The tooth root of the first tooth surface is located on the side of the tooth root of the second tooth surface away from the central opening, and the tooth tip at the junction of the first tooth surface and the second tooth surface biases towards the side where the first tooth root is located. Through the design that the tooth tip at the junction of the first tooth surface and the second tooth surface biases towards the side where the tooth root of the second tooth surface is located, the angle between the second tooth surface closer to the central opening and the vertical direction is smaller compared to the first tooth surface. The groove cooperates with the convex teeth, and the plane in the groove that contacts the second tooth surface also has a smaller angle with the vertical direction accordingly. Then, the angle between the plane in the groove that contacts the second tooth surface and the acting force direction is larger, and the force-bearing plane is close to perpendicular to the acting force direction, enabling the groove to more effectively restrict the convex teeth and prevent the movement of the central plate.

[0014] In some embodiments, the frame further includes a second mounting portion located on the side of the sidewall away from the central opening, and the second mounting portion is used to connect to the box body. By separately providing the second mounting portion on the frame, and the second mounting portion is far from the first mounting portion, it is convenient for the second mounting portion to connect to the box body, thereby realizing the connection between the cover plate and the box body.

[0015] In some embodiments, an adhesive layer is further clamped between the outer periphery of the central plate and the frame. By providing an adhesive layer between the outer periphery of the central plate and the frame, the connection strength between the central plate and the frame is improved.

[0016] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0017] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as a limitation on the scope of the present application.

[0019] Figure 1 It is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0020] Figure 2 Schematic exploded view of a battery device according to some embodiments of the present application;

[0021] Figure 3 Schematic exploded view of a battery cell according to some embodiments of the present application;

[0022] Figure 4 Schematic view of a cover plate structure according to some embodiments of the present application;

[0023] Figure 5 Top view of a cover plate according to some embodiments of the present application;

[0024] Figure 6 is Figure 5 Cross-sectional view of part A-A in

[0025] Figure 7 Schematic view of the connection structure between a center plate and a frame according to some embodiments of the present application;

[0026] Figure 8 Another schematic view of the connection structure between a center plate and a frame according to some embodiments of the present application;

[0027] Figure 9 Another schematic view of the connection structure between a center plate and a frame according to some embodiments of the present application;

[0028] Figure 10 is Figure 9 Partially enlarged schematic view of part B in

[0029] Explanation of reference numerals:

[0030] 1, vehicle; 10, battery device; 20, controller; 30, motor; 100, battery box; 110, cover plate; 111, frame; 1111, central opening; 1112, side wall; 1113, first mounting portion; 11131, first mounting plate; 11132, second mounting plate; 11133, groove; 1114, second mounting portion; 112, center plate; 1121, central portion; 1122, annular portion; 1123, first surface; 1124, second surface; 1125, convex teeth; 11251, first tooth surface; 11252, second tooth surface; 120, box body; 130, accommodation cavity; 200, battery cell; 210, end cap; 211, electrode terminal; 220, housing; 230, electrode assembly; 231, tab. Detailed Description of the Embodiments

[0031] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0036] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0039] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0040] The battery device includes a plurality of battery cells and a battery box body. The battery box body includes a box body main body and a cover plate. In the related art, the cover plate can be prepared by an integral injection molding method. However, as the size of the battery device increases, the size of the cover plate also increases correspondingly, which requires higher requirements for the injection molding equipment. For example, it is necessary to significantly increase the clamping force, resulting in a significant increase in the manufacturing cost.

[0041] To solve the above problems, the frame and the center plate of the cover plate are manufactured separately, and then the frame and the center plate are assembled to form the cover plate. The center plate is manufactured separately, and its process selection is more diverse, and a thin-walled structure can be realized, reducing the usage amount of raw materials, thereby reducing the quality of the center plate, and further reducing the quality of the entire cover plate; the frame is separately injection molded, which can significantly reduce the requirement for the injection molding clamping force, thereby reducing the manufacturing difficulty and the manufacturing cost.

[0042] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in electrical equipment such as vehicles, ships, or aircraft. The power system of the electrical equipment can be composed of the battery device disclosed in the present application. In this way, it is beneficial to reduce the quality of the entire electrical equipment.

[0043] The embodiments of the present application provide an electrical equipment using a battery device as a power source. The electrical equipment can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0044] For the convenience of description, in the following embodiments, a power-consuming device in an embodiment of the present application is taken as an example of a vehicle 1 for illustration.

[0045] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle in some embodiments of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 can be arranged at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0046] In some embodiments of the present application, the battery device 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0047] Please refer to Figure 2 , Figure 2 which is an exploded structural diagram of the battery device in some embodiments of the present application. The battery device 10 includes a battery box body 100 and battery cells 200, and the battery cells 200 are accommodated in the battery box body 100. Among them, the battery box body 100 is used to provide an accommodation space for the battery cells 200, and the battery box body 100 can adopt various structures. In some embodiments, the battery box body 100 can include a cover plate 110 and a box body main body 120. The cover plate 110 and the box body main body 120 are covered with each other, and the cover plate 110 and the box body main body 120 jointly define an accommodation space for accommodating the battery cells 200. The box body main body 120 can be a hollow structure with one end open, and the cover plate 110 can be a plate-like structure. The cover plate 110 is covered on the open side of the box body main body 120 so that the cover plate 110 and the box body main body 120 jointly define an accommodation space; the cover plate 110 and the box body main body 120 can also be hollow structures with one side open, and the open side of the cover plate 110 is covered on the open side of the box body main body 120. Of course, the battery box body 100 formed by the cover plate 110 and the box body main body 120 can be in various shapes, such as a cylinder, a cuboid, etc.

[0048] In the battery device 10, there may be multiple battery cells 200. The multiple battery cells 200 can be connected in series, parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 200. The multiple battery cells 200 can be directly connected in series, parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 200 is accommodated in the battery box 100. Of course, in the battery device 10, multiple battery cells 200 can also be first connected in series, parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, parallel, or in a combined series-parallel connection to form a whole and are accommodated in the battery box 100. The battery device 10 can also include other structures. For example, the battery device 10 can also include a busbar component for realizing the electrical connection among the multiple battery cells 200.

[0049] Among them, each battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 200 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0050] Please refer to Figure 3 , Figure 3 which is a schematic exploded view of a battery cell according to some embodiments of the present application. The battery cell 200 refers to the smallest unit that makes up the battery device. As Figure 3 , the battery cell 200 includes an end cap 210, a housing 220, an electrode assembly 230, and other functional components.

[0051] The end cap 210 refers to a component that covers the opening of the housing 220 to isolate the internal environment of the battery cell 200 from the external environment. Without limitation, the shape of the end cap 210 can be adapted to the shape of the housing 220 to cooperate with the housing 220. Optionally, the end cap 210 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 210 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 200 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on the end cap 210. The electrode terminals 211 can be used for electrically connecting with the electrode assembly 230 to output or input the electrical energy of the battery cell 200. In some embodiments, a pressure relief mechanism for discharging the internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold can also be provided on the end cap 210. The material of the end cap 210 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can be provided on the inner side of the end cap 210. The insulating member can be used to isolate the electrical connection components in the housing 220 from the end cap 210 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0052] The housing 220 is a component for cooperating with the end cap 210 to form the internal environment of the battery cell 200. Among them, the formed internal environment can be used to accommodate the electrode assembly 230, the electrolyte, and other components. The housing 220 and the end cap 210 can be independent components. An opening can be provided on the housing 220, and the end cap 210 is covered at the opening to form the internal environment of the battery cell 200. Without limitation, the end cap 210 and the housing 220 can also be integrated. Specifically, the end cap 210 and the housing 220 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 220, the end cap 210 is then covered on the housing 220. The housing 220 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 220 can be determined according to the specific shape and size of the electrode assembly 230. The material of the housing 220 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0053] The electrode assembly 230 is a component in the battery cell 200 where an electrochemical reaction occurs. The housing 220 can contain one or more electrode assemblies 230. The electrode assembly 230 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the electrode tabs 231. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the electrode tabs 231 are connected to the electrode terminals to form a current loop.

[0054] Embodiments of the present application provide a battery device 10. Please refer to Figures 4 to 6 , Figure 4 which is a schematic diagram of the cover plate structure of some embodiments of the present application, Figure 5 which is a top view of the cover plate of some embodiments of the present application, Figure 6 and Figure 5 is a cross-sectional view of part A-A in

[0055] The battery box body 100 includes a cover plate 110 and a box body main body 120. The cover plate 110 is detachably connected to the box body main body 120. The cover plate 110 and the box body main body 120 cooperate to jointly define a receiving cavity 130 for receiving the battery cells 200. The structure of the receiving cavity 130 can be in the shape of a hollow cylinder, a hollow cuboid, etc.

[0056] The cover plate 110 includes a frame 111. The frame 111 is an outer peripheral ring structure of the cover plate 110, which is used for connecting and fixing to the box body main body 120 and for sealing. The frame 111 can be a flat plate structure, and the flat plate structure covers the box body main body 120 for connection; the frame 111 can also be a folding structure, and the side wall of the folding structure is connected to the side wall of the box body main body 120. The frame 111 has a central opening 1111. The structure of the central opening 1111 can be in the shape of a circle, a rectangle, a square, etc.; the structure of the outer contour of the frame 111 is related to the structure of the battery box body 100. For example, if the box body main body 120 is a cylindrical box body, the structure of the outer contour of the frame 111 is a circle; for example, if the box body main body 120 is a cubic box body, the structure of the outer contour of the frame 111 is a square or a rectangle.

[0057] The cover plate 110 further includes a central plate 112. The central plate 112 is a middle structure of the cover plate 110, which cooperates with the frame 111 to form a complete cover plate 110, thereby improving the sealing performance of the battery box body 100. The structural shape of the central plate 112 matches the shape of the central opening 1111 of the frame 111. For example, if the structure of the central opening 1111 is a circle, the structure of the central plate 112 is a circle; for example, if the structure of the central opening 1111 is a square, the structure of the central plate 112 is a square. The central plate 112 does not bear the load requirement, and the thickness dimension is not limited. In order to reduce the mass of the cover plate 110, the thickness of the central plate 112 can be reduced. For example, the thickness of the central plate 112 is 2 mm, 3 mm, etc.

[0058] The outer periphery of the central plate 112 is fixedly connected to the frame 111. The purpose of this connection is to improve the sealing performance of the battery box body 100. The good sealing performance of the battery box body 100 can prevent electrolyte leakage, avoid damage to the environment and the human body, and ensure the long-term stable operation of the battery. At the same time, the battery box body 100 can prevent the erosion and damage of internal components of the battery box body 100 by external moisture, dust, chemical substances, etc., and improve the service life and stability of the battery cells 200. The specific connection method can be determined according to the actual situation. For example, the outer periphery of the central plate 112 is bonded to the frame 111 with chemical glue; for example, a connection structure is provided on the outer periphery of the central plate 112, and a corresponding connection structure is also provided on the frame 111, and the connection structures are used in cooperation to perform snap connection. By fixedly connecting the outer periphery of the central plate 112 to the frame 111, the central plate 112 closes the central opening 1111 of the frame 111.

[0059] By dividing the cover plate 110 into two parts, namely the frame 111 and the central plate 112, the two parts can be manufactured separately. For the separate manufacturing of the central plate 112, the process selection is more diverse. Compared with the integral injection molding of the entire cover plate 110, a thin-walled structure can be achieved at the central part of the cover plate 110, reducing the usage of raw materials, thus reducing the mass of the central plate, and further reducing the mass of the entire cover plate. For the separate injection molding process of the frame 111, only the frame 111 needs to be clamped by the clamping force. Compared with the integral injection molding of the entire cover plate 110, it can also effectively reduce the requirement for the tonnage of the injection molding machine, reducing the manufacturing difficulty and manufacturing cost.

[0060] According to some embodiments of the present application, as Figure 7 shown, Figure 7 is a schematic diagram of the connection structure between the central plate and the frame in some embodiments of the present application. The central plate 112 includes a central portion 1121 and an annular portion 1122 surrounding the outer periphery of the central portion 1121. The annular portion 1122 includes a first surface 1123 and a second surface 1124 oppositely arranged in the thickness direction of the central plate 112. At least one of the first surface 1123 and the second surface 1124 overlaps at least partially with the frame 111 and is lap-fixed.

[0061] The central plate 112 includes a central portion 1121 and an annular portion 1122, and the two can be two parts or two regions of an integral body. As Figure 6 shown, the central portion 1121 is located in the central region of the central plate 112. The annular portion 1122 is located in the edge region surrounding the outer periphery of the central portion 1121. The annular portion 1122 overlaps at least partially with the frame 111 and is lap-fixed. Here, the lap-fixing can be fixed by any feasible connection method, including fixing by using a connection structure and adhesive fixing, etc.

[0062] The annular portion 1122 includes a first surface 1123 and a second surface 1124, and the first surface 1123 and the second surface 1124 are oppositely arranged in the thickness direction of the central plate 112. For example, when the central plate 112 is in a horizontal placement state, the upward-facing surface of the annular portion 1122 is the first surface 1123, and the downward-facing surface of the annular portion 1122 is the second surface 1124.

[0063] In some embodiments, the annular portion 1122 of the central plate 112 may be lap-fixed to the frame 111 by hot pressing. Exemplarily, the annular portion 1122 may be lapped and connected to the frame 111 through the first surface 1123, that is, the upper surface of the annular portion 1122 contacts and is lap-fixed to the frame 111; Exemplarily, the annular portion 1122 may be connected to the frame 111 through the second surface 1124, that is, the lower surface of the annular portion 1122 contacts and is lap-fixed to the frame 111; Exemplarily, the annular portion 1122 may be connected to the frame 111 through both the first surface 1123 and the second surface 1124. For example, the frame 111 is formed with a recess, and at least part of the annular portion 1122 is snapped into the recess of the frame 111 and lap-fixed to the surface of the recess.

[0064] By dividing the central plate 112 into two parts, the central portion 1121 and the annular portion 1122, and providing the first surface 1123 and the second surface 1124 on the annular portion 1122, according to the actual situation of the frame 111, it is possible to select lap-fixing with the first surface 1123, or lap-fixing with the second surface 1124, or lap-fixing with both the first surface 1123 and the second surface 1124 at the same time, and the flexibility of the lap-fixing method selection is high.

[0065] According to some embodiments of the present application, as Figure 7 shown, the frame 111 includes a side wall 1112 and a first mounting portion 1113. The side wall 1112 defines a central opening 1111; The first mounting portion 1113 is located on the side of the side wall 1112 close to the central opening 1111, and at least part of the first mounting portion 1113 is stacked with the annular portion 1122 to achieve lap-fixing of the central plate 112 and the frame 111.

[0066] The frame 111 has a folding structure, specifically including a side wall 1112 and a first mounting portion 1113. The side wall 1112 is a structure for connecting to the box body 120, and the side wall 1112 encloses a cavity, and the central opening 1111 of the frame 111 communicates with the cavity. The first mounting portion 1113 is a structure for connecting to the annular portion 1122 of the central plate 112. The first mounting portion 1113 is located on the side of the side wall 1112 close to the central opening 1111, and the structure of the first mounting portion 1113 is related to the structure of the central opening 1111. For example, if the structure of the central opening 1111 is circular, the structure of the first mounting portion 1113 is a circular ring; For example, if the structure of the central opening 1111 is square, the structure of the first mounting portion 1113 is a square ring. Lap-fixing of the central plate 112 and the frame 111 is achieved by at least part of the first mounting portion 1113 being stacked with the annular portion 1122. The lamination here includes connection forms in which the annular portion 1122 is located above the first mounting portion 1113, or connection forms in which the annular portion 1122 is located below the first mounting portion 1113, and so on.

[0067] By dividing the frame 111 into two parts, namely the side wall 1112 and the first mounting portion 1113, taking the first mounting portion 1113 as the portion connected to the annular portion 1122, and overlapping and fixing the first mounting portion 1113 and the annular portion 1122 in a stacked manner, the stacked structure is convenient for installation and the choice of connection method has flexibility.

[0068] According to some embodiments of the present application, as Figure 7 shown, the first mounting portion 1113 includes a first mounting plate 11131 and a second mounting plate 11132 that are spaced apart in the vertical direction, and at least a part of the annular portion 1122 is clamped between the first mounting plate 11131 and the second mounting plate 11132.

[0069] The frame 111 and the central plate 112 are connected in a stacked manner. In order to improve the connection stability, the first mounting portion 1113 includes a first mounting plate 11131 and a second mounting plate 11132. The first mounting plate 11131 and the second mounting plate 11132 are spaced apart in the vertical direction and there is a cavity between them. The annular portion 1122 is fixed in the cavity and is vertically limited by the first mounting plate 11131 and the second mounting plate 11132. In some embodiments, the first mounting plate 11131 and the second mounting plate 11132 can be two opposite protruding parts that form a recess.

[0070] It should be noted that the first mounting plate 11131 and the second mounting plate 11132 are part of the frame 111 and are of an integrally formed structure. During the installation of the central plate 112, the central plate 112 is a thin-walled structure and its material has a certain toughness. The central plate 112 is bent and the annular portion 1122 is inserted into the cavity between the first mounting plate 11131 and the second mounting plate 11132. The central plate 112 and the first mounting portion 1113 can be connected by a hot pressing method. Considering the sealing performance, a sealing glue is added at the contact positions between the annular portion 1122 and the first mounting plate 11131 and the second mounting plate 11132 for bonding.

[0071] By setting the structure of the first mounting portion 1113 as the first mounting plate 11131 and the second mounting plate 11132 that are spaced apart in the vertical direction, fixing the annular portion 1122 between the first mounting plate 11131 and the second mounting plate 11132, and using the first mounting plate 11131 and the second mounting plate 11132 to vertically limit the annular portion 1122, the connection stability between the central plate 112 and the frame 111 is effectively improved.

[0072] According to some embodiments of the present application, as Figure 8 shown, Figure 8This is a schematic diagram of another connection structure between the center plate and the frame of some embodiments of the present application. The surface where the annular portion 1122 contacts the first mounting portion 1113 has a first concave-convex structure, and the surface where the first mounting portion 1113 contacts the annular portion 1122 has a second concave-convex structure, and the first concave-convex structure is used to engage with the second concave-convex structure.

[0073] The frame 111 and the center plate 112 are connected in a stacked manner. In order to improve the stability of the connection, a first concave-convex structure is provided on the surface of the annular portion 1122, and a second concave-convex structure is provided on the surface of the first mounting portion 1113. The first concave-convex structure and the second concave-convex structure can be understood as the surface of the annular portion 1122 and the surface of the first mounting portion 1113 are not smooth planes, but are uneven structures. The first concave-convex structure and the second concave-convex structure are meshed with each other, thereby increasing the contact area between the annular portion 1122 and the first mounting portion 1113, and the two can restrict each other to prevent movement. For example, if the first concave-convex structure is a convex structure, the second concave-convex structure is a corresponding groove structure; for example, if the first concave-convex structure is a groove structure, the second concave-convex structure is a corresponding convex structure.

[0074] The first concave-convex structure and the second concave-convex structure are respectively arranged on the surface of the annular portion 1122 and the surface of the first mounting portion 1113, which effectively increases the contact area between the annular portion 1122 and the first mounting portion 1113, and the first concave-convex structure and the second concave-convex structure are mutually limited to prevent movement, further improving the stability of the connection.

[0075] According to some embodiments of the present application, such as Figure 8 As shown in FIG. 1 , the first concave-convex structure includes a plurality of convex teeth 1125 arranged along a first direction perpendicular to the surface of the side wall 1112, and the second concave-convex structure includes a plurality of grooves 11133 arranged along the first direction, and the cross-sectional shape of the grooves 11133 matches the cross-sectional shape of the convex teeth 1125.

[0076] The frame 111 and the center plate 112 are connected in a stacked manner. The first concave-convex structure includes a convex tooth 1125, and the second concave-convex structure includes a groove 11133. For the sake of explanation, exemplarily, the second surface 1124 of the annular portion 1122 of the center plate 112 fits with the first mounting portion 1113. The convex tooth 1125 is a structure in which the second surface 1124 extends downward in the vertical direction. It is arranged at intervals along the second surface 1124 of the annular portion 1122. The plane where the second surface 1124 is located is parallel to the first direction. The groove 11133 is a structure in which the surface of the first mounting portion 1113 is concave and extends downward in the vertical direction. The cross-sectional shape of the groove 11133 is adapted to the cross-sectional shape of the convex tooth 1125, and the convex tooth 1125 and the groove 11133 can correspond one to one.

[0077] ​​By providing convex teeth 1125 and grooves 11133 on the surfaces of the annular portion 1122 and the first mounting portion 1113 respectively, the contact area between the annular portion 1122 and the first mounting portion 1113 is effectively increased, and the convex teeth 1125 and the grooves 11133 are limited to each other to prevent movement, further enhancing the connection stability.

[0078] According to some embodiments of the present application, the cross-sectional shape of the convex teeth 1125 is triangular, rectangular or trapezoidal.

[0079] The convex teeth 1125 of the first concave-convex structure are adapted to the grooves 11133 of the second concave-convex structure. If the cross-sectional shape of the convex teeth 1125 is triangular, rectangular or trapezoidal, the cross-sectional shape of the grooves 11133 is also triangular, rectangular or trapezoidal.

[0080] By providing various shapes for the cross-section of the convex teeth 1125, the appropriate cross-sectional shape of the convex teeth 1125 can be selected according to the requirements to enhance the connection stability between the central plate 112 and the frame 111.

[0081] According to some embodiments of the present application, such as Figure 9 and Figure 10 shown, Figure 9 FIG. is a schematic diagram of another connection structure between the central plate and the frame according to some embodiments of the present application, Figure 10 is Figure 9 a partial enlarged schematic diagram of part B in FIG.. The convex teeth 1125 include an intersecting first tooth surface 11251 and a second tooth surface 11252. The tooth root of the first tooth surface 11251 is located on the side away from the central opening 1111 of the tooth root of the second tooth surface 11252, and the tooth tip at the junction of the first tooth surface 11251 and the second tooth surface 11252 is biased towards the side where the tooth root of the second tooth surface 11252 is located.

[0082] The surface of the annular portion 1122 has convex teeth 1125 extending downward in the vertical direction. A single convex tooth 1125 has a first tooth surface 11251 and a second tooth surface 11252. The tooth root of the first tooth surface 11251 is located on the side away from the central opening 1111 of the tooth root of the second tooth surface 11252. It can be understood that for the same convex tooth 1125, the side close to the central opening 1111 is the second tooth surface 11252, and the side away from the central opening 1111 is the first tooth surface 11251.

[0083] The tooth tip at the junction of the first tooth surface 11251 and the second tooth surface 11252 is biased towards the side where the tooth root of the second tooth surface 11252 is located. It can be understood that the distance between the tooth tip and the tooth root of the second tooth surface 11252 is less than the distance between the tooth tip and the tooth root of the first tooth surface 11251. The angle between the first tooth surface 11251 and the bottom surface of the convex tooth 1125 is the first angle α1, and the angle between the second tooth surface 11252 and the bottom surface of the convex tooth 1125 is the second angle α2. The first angle α1 is less than the second angle α2. The first angle α1 and the second angle α2 can be determined according to the actual situation. Exemplarily, if the second angle α2 is 90°, then the second tooth surface 11252 is perpendicular to the bottom surface of the convex tooth 1125.

[0084] The surface of the first mounting portion 1113 in contact with the annular portion 1122 has a second concavo-convex structure, and the second concavo-convex structure is a groove 11133 that can cooperate with the convex tooth 1125 of the annular portion 1122.

[0085] Considering that when the central plate 112 is stressed in the vertical direction, the annular portion 1122 on the outer periphery of the central plate 112 will generate a force towards the central opening 1111, and the direction of the force is close to the horizontal direction, as Figure 9 shown by the arrow direction in, through the design of biasing the tooth tip at the junction of the first tooth surface 11251 and the second tooth surface 11252 towards the side where the tooth root of the second tooth surface 11252 is located, the angle between the second tooth surface 11252 on the side close to the central opening 1111 and the vertical direction is smaller than that of the first tooth surface 11251. The groove 11133 cooperates with the convex tooth 1125, and the plane in the groove 11133 in contact with the second tooth surface 11252 also has a smaller angle with the vertical direction accordingly. Then, the angle between the plane in the groove 11133 in contact with the second tooth surface 11252 and the force direction is larger, and the force-bearing plane is close to perpendicular to the force direction, so that the groove 11133 can more effectively restrict the convex tooth 1125 and prevent the movement of the central plate 112.

[0086] According to some embodiments of the present application, the frame 111 further includes a second mounting portion 1114. The second mounting portion 1114 is located on the side of the side wall 1112 away from the central opening 1111, and the second mounting portion 1114 is used to connect with the box body 120.

[0087] The frame 111 includes a side wall 1112, a first mounting portion 1113, and a second mounting portion 1114. The first mounting portion 1113 is located on the side of the side wall 1112 close to the central opening 1111, and the second mounting portion 1114 is located on the side of the side wall 1112 away from the central opening 1111. The first mounting portion 1113 is connected to the central plate 112, and the second mounting portion 1114 is connected to the box body 120, so that the cover plate 110 and the box body 120 form a sealed structure. The second mounting portion 1114 is any structure capable of being connected to the box body 120. For example, the second mounting portion 1114 has a flange surface and is connected to the box body 120 through the flange surface.

[0088] By separately providing the second mounting portion 1114 on the frame 111, and the second mounting portion 1114 is far from the first mounting portion 1113, it is convenient for the second mounting portion 1114 to be connected to the box body 120, thereby realizing the connection between the cover plate 110 and the box body 120.

[0089] According to some embodiments of the present application, an adhesive layer is further interposed between the outer periphery of the central plate 112 and the frame 111.

[0090] The central plate 112 includes a central portion 1121 and a ring portion 1122 surrounding the outer periphery of the central portion 1121. The ring portion 1122 is connected to the frame 111, and an adhesive layer is provided between the ring portion 1122 and the frame 111 to enhance the connection strength between the central plate 112 and the frame 111.

[0091] An adhesive layer is provided between the outer periphery of the central plate 112 and the frame 111 to enhance the connection strength between the central plate 112 and the frame 111.

[0092] The embodiment of the present application provides an electrical device, which includes the battery device 10 in any one of the above embodiments.

[0093] The embodiment of the present application provides a battery device 10, as Figure 4 and Figure 9 shown, the battery device 10 includes a battery box body 100 and a plurality of battery cells 200. The battery box body 100 includes a cover plate 110 and a box body 120. The cover plate 110 is used to cooperate with the box body 120 to jointly define an accommodation cavity 130; the cover plate 110 includes a frame 111 and a central plate 112. The frame 111 is formed with a central opening 1111 and is detachably connected to the box body 120. The outer periphery of the central plate 112 is fixedly connected to the frame 111 to close the central opening 1111.

[0094] The central plate 112 includes a central portion 1121 and a ring portion 1122 surrounding the outer periphery of the central portion 1121. The surface of the ring portion 1122 has a first concave-convex structure.

[0095] The frame 111 includes a side wall 1112, a first mounting portion 1113 and a second mounting portion 1114. The first mounting portion 1113 is located on the side of the side wall 1112 close to the central opening 1111, and the surface of the first mounting portion 1113 has a second concavo-convex structure. The second mounting portion 1114 is located on the side of the side wall 1112 away from the central opening 1111, and the second mounting portion 1114 is connected to the box body 120.

[0096] The first concavo-convex structure is used to engage with the second concavo-convex structure.

[0097] Wherein, the first concavo-convex structure includes a plurality of convex teeth 1125 arranged in a first direction perpendicular to the surface of the side wall 1112, the second concavo-convex structure includes a plurality of grooves 11133 arranged in the first direction, the convex teeth 1125 include an intersecting first tooth surface 11251 and a second tooth surface 11252, the tooth root of the first tooth surface 11251 is located on the side of the tooth root of the second tooth surface 11252 away from the central opening 1111, and the tooth tip at the junction of the first tooth surface 11251 and the second tooth surface 11252 is biased towards the side where the tooth root of the second tooth surface 11252 is located. The cross-sectional shape of the groove 11133 is adapted to the cross-sectional shape of the convex tooth 1125.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A plurality of battery cells, and A battery box body is formed to form a receiving cavity for receiving the plurality of battery cells, and the battery box body comprises: The box body, and A cover plate is used to cooperate with the box body to jointly define the accommodating cavity; the cover plate includes a frame and a center plate that are manufactured and formed separately, the frame is injection molded, and the frame is formed with a center opening and is detachably connected to the box body, and the periphery of the center plate is fixedly connected to the frame to close the center opening.

2. The battery device according to claim 1, characterized in that: The center plate includes a center portion and an annular portion surrounding the outer periphery of the center portion; The annular portion includes a first surface and a second surface that are arranged opposite to each other along the thickness direction of the central plate, and at least one of the first surface and the second surface at least partially overlaps with the frame and is overlapped and fixed.

3. The battery device according to claim 2, characterized in that: The frame includes: a side wall defining the central opening; and A first mounting portion, wherein the first mounting portion is located on a side of the side wall close to the central opening, and the first mounting portion is at least partially stacked with the annular portion to achieve overlapping and fixing of the central plate and the frame.

4. The battery device according to claim 3, characterized in that: The first mounting portion includes a first mounting plate and a second mounting plate spaced apart in a vertical direction, and the annular portion is at least partially sandwiched between the first mounting plate and the second mounting plate.

5. The battery device according to claim 3 or 4, characterized in that: The surface of the annular portion contacting the first mounting portion has a first concavo-convex structure, and the surface of the first mounting portion contacting the annular portion has a second concavo-convex structure, wherein the first concavo-convex structure is used to mesh with the second concavo-convex structure.

6. The battery device according to claim 5, characterized in that: The first concavo-convex structure includes a plurality of convex teeth arranged along a first direction perpendicular to the side wall surface, and the second concavo-convex structure includes a plurality of grooves arranged along the first direction, and the cross-sectional shape of the grooves is adapted to the cross-sectional shape of the convex teeth.

7. The battery device according to claim 6, characterized in that: The cross-sectional shape of the protruding teeth is triangular, rectangular or trapezoidal.

8. The battery device according to claim 6, characterized in that: The convex tooth includes a first tooth surface and a second tooth surface intersecting each other, the tooth root of the first tooth surface is located on the side of the tooth root of the second tooth surface away from the central opening, and the tooth tip at the junction of the first tooth surface and the second tooth surface is biased toward the side where the tooth root of the second tooth surface is located.

9. The battery device according to claim 3 or 4, characterized in that: The frame also includes: A second mounting portion, wherein the second mounting portion is located at a side of the side wall away from the central opening, and the second mounting portion is used to be connected to the box body.

10. The battery device according to any one of claims 1 to 4, characterized in that: An adhesive layer is also sandwiched between the outer periphery of the central plate and the frame.

11. An electrical device, characterized in that: The electrical equipment comprises a battery device as claimed in any one of claims 1 to 10, wherein the battery device is used to provide electrical energy.

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