Battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The invention belongs to the technical field of battery production, and provides a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, the battery device comprises a battery monomer assembly, a box body and a first structural beam, the box body is provided with a containing space for containing the battery monomer assembly, the box body comprises a box frame part arranged in a surrounding mode, and the first structural beam is arranged on the box frame part; the box wall face, facing the containing space, of the box frame part is provided with two oppositely-arranged first riveting grooves. The first structural beam is provided with two first mortise joint parts, the two first mortise joint parts are formed at the two ends of the first structural beam in the length direction respectively, the first structural beam is located in the containing space, and the two first mortise joint parts are correspondingly matched with the two opposite first mortise joint grooves in an inserted mode respectively. The invention aims to improve the relative stability and reliability of the connection between the first structural beam and the box body.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a battery device, an energy storage device, an energy storage system, an electrical device and a charging network. Background Art

[0002] When the battery device generates heat during charging and discharging, the battery cell assembly will expand due to the heat. Therefore, a structural beam is usually provided in the box body. The structural beam can be deformed. When the battery cell assembly expands, the structural beam is squeezed to cope with the volume change of the battery cell assembly. It can be seen that the structural beam will be subjected to a large extrusion stress. The large extrusion force can easily cause the connection position between the structural beam and the box body to loosen, resulting in displacement of the structural beam relative to the box body, thereby affecting the reliability of the connection between the structural beam and the box body. Summary of the invention

[0003] The purpose of the present application is to provide a battery device, an energy storage device, an energy storage system, an electrical device and a charging network, aiming to solve the technical problem of poor connection reliability of the first structural beam on the box body.

[0004] In a first aspect, the present application provides a battery device, comprising: Battery cell assembly; The box body has a storage space for accommodating the battery monomer assembly, and the box body includes a surrounding box frame portion, and the box frame portion has two first mortise and tenon grooves arranged opposite to each other on the box wall surface facing the storage space; The first structural beam has two first mortise and tenon joints, which are respectively formed at two ends of the first structural beam along the length direction. The first structural beam is located in the accommodating space, and the two first mortise and tenon joints are respectively plugged and matched with two opposite first mortise and tenon grooves.

[0005] In the present embodiment, by forming first mortise and tenon portions at both ends of the first structural beam respectively, and correspondingly opening a first mortise and tenon groove on the box wall surface of the box body, when the first structural beam is assembled with the box body, the first mortise and tenon portion and the first mortise and tenon groove are connected by mortise and tenon insertion, and a certain cross limiting portion is formed between the end portions of the box frame portion and the first structural beam, and the box frame portion forms a limiting wrapping for the end portion of the first structural beam outside the end portion of the first structural beam (referring to the first mortise and tenon portion at the end portion), so that the first structural beam is not easy to move in the groove depth direction perpendicular to the first mortise and tenon groove, thereby improving the limiting stability and reliability of the box frame portion on the first structural beam.

[0006] In one of the embodiments, the battery device also includes a second structural beam accommodated in the accommodating space, the second structural beam has two second mortise and tenon joints, and the two second mortise and tenon joints are respectively formed at both ends of the second structural beam along the length direction; the box frame portion has two oppositely arranged second mortise and tenon grooves on the box wall surface facing the accommodating space, and the two second mortise and tenon joints are respectively plugged into and matched with the two opposite second mortise and tenon grooves; the second structural beam and the first structural beam are cross-engaged in a configuration.

[0007] In this embodiment, by adding a second structural beam and making the second structural beam cross-engaged with the first structural beam, and by connecting the second mortise and tenon joints at both ends of the second structural beam, the mortise and tenon joint limiting of the second structural beam and the box frame part is achieved, and the first structural beam, the second structural beam and the box frame part have a self-locking feature, which is beneficial to improving the connection reliability between the first structural beam, the second structural beam and the box frame part.

[0008] In one embodiment, the box body also includes a box bottom for supporting the battery cell assembly, the box bottom is connected to the box frame, a first biting groove is opened on the side of the first structural beam away from the box bottom, and a second biting groove is opened on the side of the second structural beam close to the box bottom corresponding to the first biting groove, and the first structural beam and the second structural beam are cross-biting at the positions of the first biting groove and the second biting groove.

[0009] In this embodiment, the first structural beam is cross-engaged with the second structural beam at a side position closer to the bottom of the box, which is beneficial to improving the anti-extrusion ability of the first structural beam and the anti-deformation ability of the first structural beam.

[0010] In one of the embodiments, protruding structural members are provided on two box wall surfaces of the box frame portion that are respectively opposite to the two ends of the second structural beam, and two second mortise and tenon joints are respectively opened on the two structural members and extend into the box wall surface 11141, and at least one second mortise and tenon joint penetrates to the top surface of the structural member along the height direction.

[0011] In this embodiment, the structural member can enhance the structural strength of the box frame. Opening the second mortise and tenon groove on the structural member can protect the box frame, reduce damage to the overall structural strength of the box frame, and help improve the overall rigidity and strength of the box body.

[0012] In one embodiment, the first tenon joint and the box frame are welded; and / or The second tenon joint portion is welded to the box frame portion.

[0013] In this embodiment, welding is performed at the positions where the first tenon joint and the second tenon joint are respectively connected to the box frame portion, which is beneficial to enhancing the structural strength between the first tenon joint, the second tenon joint and the box frame portion.

[0014] In one embodiment, the box frame includes a box wall body, which is a hollow structure. A first cavity is formed inside the box wall body, and a first mortise and tenon groove is opened on the box wall body and passes through the first cavity; the box body also includes a first supporting rib body, which is arranged in the first cavity and connected to the cavity wall of the first cavity, and the first supporting rib body abuts against the first mortise and tenon joint.

[0015] In this embodiment, a first supporting rib is added in the first cavity of the box wall so that the first supporting rib can abut against the first mortise and tenon joint. When the first structural beam is subjected to the squeezing force of the battery cell assembly, the deformation resistance of the box wall is improved, and the stability and reliability of the connection between the first mortise and tenon joint and the box wall are improved.

[0016] In one embodiment, the box wall body includes a first box wall and a second box wall that are arranged opposite to each other, the first box wall is arranged toward the accommodating space, and the notch of the first mortise and tenon groove is opened on the first box wall; the first supporting rib body includes a first supporting plate accommodated in the first cavity, and the first supporting plate is connected between the first box wall and the second box wall.

[0017] In this embodiment, the first supporting rib adopts a first supporting plate connected between the first box wall and the second box wall. The first supporting plate can improve the anti-deformation ability between the first box wall and the second box wall while abutting and supporting the first mortise and tenon joint, thereby improving the structural strength and rigidity of the box wall.

[0018] In one embodiment, the first supporting rib body further includes a second supporting plate accommodated in the first cavity and connected to the box wall body, and the second supporting plate is connected to the cavity wall of the first cavity and cross-connected with the first supporting plate.

[0019] In this embodiment, a second support plate is further provided and combined with the first support plate, thereby further improving the support strength of the first mortise and tenon joint and the first structural beam, and improving the strength, rigidity and deformation resistance of the box wall.

[0020] In one embodiment, the first structural beam includes a first beam body and a second beam body extending in the same direction. The first beam body and the second beam body are arranged side by side and connected in the height direction. The two extending ends of the first beam body are respectively connected to the first mortise and tenon joints, and the two extending ends of the second beam body are both in contact with the box wall.

[0021] In this embodiment, when the first structural beam is connected to the box body, the first tenon joint at the end of the first beam body is inserted into the first mortise and tenon groove, and the extended end face of the second beam body can abut against the wall surface of the first box wall, thereby increasing the connection area between the first structural beam and the first box wall, which is beneficial to improving the connection reliability between the first structural beam and the first box wall, and can provide more possibilities for setting more connection structures between the first structural beam and the first box wall.

[0022] In one embodiment, the first mortise and tenon portions protrude along the width direction of the first structural beam to form first step portions, and second step portions are formed on two opposite groove walls of the first mortise and tenon grooves corresponding to the two first step portions, and the first step portions are matched and plugged into the second step portions.

[0023] In this embodiment, by respectively providing first step portions on both side surfaces of the first tenon portion, and correspondingly providing second step portions on the two side walls of the first mortise groove, the first step portion and the second step portion are engaged and plugged together, thereby facilitating improving the positioning accuracy when the first tenon portion and the first mortise groove are plugged together, and improving the connection reliability between the first tenon portion and the first mortise groove.

[0024] In one embodiment, the first step portion extends from the first tenon portion to the first beam body.

[0025] In this embodiment, extending the first step portion to the first beam body can facilitate the integral preparation and molding of the first step portion, the first beam body and the first structural beam, thereby improving the convenience of preparing the first structural beam.

[0026] In one embodiment, the first beam body is detachably connected to the second beam body; or The first beam body is welded to the second beam body; or The first beam body and the second beam body are integrally formed.

[0027] In this embodiment, the first beam body and the second beam body can be connected in a variety of ways, which is beneficial to improving the flexibility of the overall structure of the first structural beam and improving the convenience during assembly and manufacturing.

[0028] In one embodiment, the first structural beam and the first mortise and tenon joint are both hollow structures, a first cavity is formed inside the first structural beam and passes through the first mortise and tenon joint, a first structural rib is arranged in the first cavity, and the first structural rib is connected to the cavity wall of the first cavity.

[0029] In this embodiment, the first structural beam and the first tenon joint adopt a hollow structure, which is beneficial to reducing weight and achieving lightweight battery device. Adding the first structural rib in the cavity is beneficial to enhancing the deformation resistance of the first structural beam and the first tenon joint.

[0030] In one embodiment, the box frame includes a box wall body, which is a hollow structure. A second cavity is formed inside the box wall body, and a second mortise and tenon groove is opened on the box wall body and passes through the second cavity; the box body also includes a second supporting rib body, which is arranged in the second cavity and connected to the cavity wall of the second cavity, and the second supporting rib body abuts against the second mortise and tenon portion.

[0031] In this embodiment, a second supporting rib is added in the second cavity of the box wall so that the second supporting rib can abut against the second mortise and tenon joint. When the second structural beam is subjected to force, the deformation resistance of the box wall is improved, and the stability and reliability of the connection between the second mortise and tenon joint and the box wall are improved.

[0032] In one embodiment, the second supporting rib includes a third supporting plate accommodated in the second cavity, and the third supporting plate is connected to the cavity wall of the second cavity.

[0033] In this embodiment, the second supporting rib adopts a third supporting plate connected between the first box wall and the second box wall. The third supporting plate can improve the anti-deformation ability between the first box wall and the second box wall while abutting and supporting the second mortise and tenon joint, thereby improving the structural strength and rigidity of the box wall.

[0034] In one embodiment, the second supporting rib body further includes a fourth supporting plate accommodated in the second cavity and connected to the box wall body, and the fourth supporting plate is connected to the cavity wall of the second cavity and cross-connected with the third supporting plate.

[0035] In this embodiment, a fourth support plate is further provided and combined with the third support plate, thereby further improving the support strength of the second mortise and tenon joint and the second structural beam, and improving the strength, rigidity and deformation resistance of the box wall.

[0036] In one embodiment, the second structural beam and the second mortise and tenon joint are both hollow structures, a second cavity is formed inside the second structural beam and passes through the second mortise and tenon joint, a second structural rib is arranged in the second cavity, and the second structural rib is connected to the cavity wall of the second cavity.

[0037] In this embodiment, the second structural beam and the second tenon joint adopt a hollow structure, which is beneficial to reducing weight and achieving lightweight battery device. Adding a second structural rib in the cavity is beneficial to enhancing the deformation resistance of the second structural beam and the second tenon joint.

[0038] In a second aspect, the present application provides an energy storage device, comprising a plurality of battery devices as described above, the battery devices being used to store or provide electrical energy.

[0039] In a third aspect, the present application provides an energy storage system, including a power conversion device and the above-mentioned energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0040] In a fourth aspect, the present application provides an electrical device, comprising any of the above-mentioned battery devices, the above-mentioned energy storage devices or the above-mentioned energy storage systems, wherein the battery device is used to store or provide electrical energy.

[0041] In a fifth aspect, the present application provides a charging network, including a charging pile and the above-mentioned energy storage device or the above-mentioned energy storage system, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application; Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application; Figure 3 Schematic diagram of the structure of the battery device provided in some embodiments of the present application Figure 1 ; Figure 4 for Figure 3 Schematic diagram of the decomposition structure; Figure 5 for Figure 4 A partial enlarged view of position A in the middle; Figure 6 for Figure 4 A partial enlarged view of position B in the middle; Figure 7 Schematic diagram of the structure of the battery device provided in some embodiments of the present application Figure 2 ; Figure 8 for Figure 7 axonometric drawing; Fig. 9 for Figure 8 Schematic diagram of the decomposition structure; Fig.10 for Fig. 9 A partial enlarged view of the E position in the middle; Fig.11 for Fig. 9 A partial enlarged view of the F position in the middle; Fig.12 for Fig. 9 A partial magnified view of the middle D position; Fig.13 for Fig. 9 A partial enlarged view of the middle C position; Fig.14 A schematic structural diagram of the connection between a first tenon joint and a box wall in a battery device is provided for some embodiments of the present application.

[0045] Description of reference numerals: 1000, vehicle; 1100, battery device; 1110, box body; 1111, first part; 1112, second part; 1113, accommodating space; 1114, box frame; 11141, box wall; 11142, box wall; 11143, first cavity; 11144, second cavity; 11145, first mortise groove; 11146, second step; 11147, second mortise groove; 11148, first box wall; 11149, second box wall; 11150, structural member; 1115, first supporting rib; 11151, first supporting plate; 11152, second supporting plate; 1116, second supporting rib; 11161, third supporting plate; 111 62. Fourth support plate; 1117. Box bottom; 1120. Battery cell assembly; 1130. First structural beam; 1131. First mortise and tenon joint; 11311. First step portion; 1132. First cavity; 1133. First beam body; 1134. Second beam body; 11341. Abutment surface; 1135. First structural rib body; 1136. First bite groove; 1140. Second structural beam; 1141. Second mortise and tenon joint; 1142. Second cavity; 1143. Second structural rib body; 1144. Second bite groove; 1200. Controller; 1300. Motor; 1500. First welding position; 1600. Second welding position; L1. First gap; L2. Second gap. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] A battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, in parallel, or in mixed connection through a busbar.

[0055] The battery device may be a battery pack, which generally includes a box and one or more battery cell assemblies, which are contained in the box. When the battery device generates heat during charging and discharging, the battery cell assemblies will expand due to the heat, and the expanded battery cell assemblies will cause stress or damage to the box, causing the box to deform; therefore, in the related art, a structural beam is usually set inside the box, and the structural beam can be understood as an expansion beam. The structural beam can deform or deform itself, and the battery cell assembly expands and squeezes the structural beam. The structural beam absorbs and disperses the stress caused by thermal expansion through deformation to cope with the volume change and stress damage of the battery cell assembly. It can be seen that the structural beam will be subjected to a large extrusion stress.

[0056] Generally, the expansion beam has a certain extension length and is subjected to extrusion force throughout the entire extension length of the expansion beam. Therefore, the expansion beam is very prone to bending, which affects the stability of the expansion beam on the box. For example, the expansion beam bends in the direction of the extension length. The bent expansion beam is prone to stress and interference problems on the box, causing deformation of the box and affecting the appearance and use of the battery device.

[0057] Usually, the end of the structural beam directly abuts against the inner wall surface of the box body, and the end of the structural beam is connected to the box wall of the box body by bolts and other fasteners. When the structural beam is subjected to a large extrusion force for a long time, the bolts and other fasteners are prone to loosening, which in turn causes the connection position between the structural beam and the box body to loosen, resulting in the displacement of the structural beam relative to the box body, thereby affecting the reliability of the connection between the structural beam and the box body.

[0058] Therefore, the present application provides a battery device, in which first mortise and tenon portions are respectively arranged at the ends of the structural beam, and first mortise and tenon grooves are correspondingly opened on a box body connected to the structural beam, so that the first mortise and tenon portions are inserted into the first mortise and tenon grooves, and the first mortise and tenon portions are connected to the first mortise and tenon grooves by mortise and tenon insertion, and the structural beam is limited by the first mortise and tenon grooves, so that the structural beam is not easily displaced relative to the box body in a groove depth direction perpendicular to the first mortise and tenon grooves, thereby improving the relative stability and reliability of the connection between the structural beam and the box body.

[0059] Specifically, refer to Figure 2As shown, an embodiment of the present application provides a battery device 1100, which includes one or more battery cell assemblies 1120. The battery device 1100 disclosed in the embodiment of the present application can be used for an electrical device that uses the battery device 1100 as a power source or various energy storage devices and energy storage systems that use the battery device 1100 as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle 1000, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0060] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0061] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1100 is provided inside the vehicle 1000, and the battery device 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 1100 may be used to power the vehicle 1000, for example, the battery device 1100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery device 1100 to power the motor 1300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0062] In some embodiments of the present application, the battery device 1100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0063] Please refer to Figure 2 As shown, Figure 2A schematic diagram of the exploded structure of a battery device 1100 provided for some embodiments of the present application. The battery device 1100 includes a housing 1110 and a battery cell assembly 1120. A housing space 1113 is formed in the housing 1110. The battery cell assembly 1120 is accommodated in the housing space 1113. The battery cell assembly 1120 is often formed by arranging a plurality of battery cells, or the battery cell assembly 1120 can also be a battery module (Battery Module), which is an independent module formed by arranging and fixing a plurality of battery cells. As an example, a battery module can be formed by bundling a plurality of battery cells by cable ties. Among them, the housing 1110 is used to provide an accommodating space 1113 for the battery cell assembly 1120, and the housing 1110 can adopt a variety of structures.

[0064] A battery cell refers to the smallest unit constituting the battery device 1100. Each battery cell may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, but is not limited thereto. The battery cell may be cylindrical, flat, rectangular or in other shapes.

[0065] According to some embodiments of the present application, referring to Figure 2-6 As shown, an embodiment of the present application provides a battery device 1100, which includes a battery cell assembly 1120, a box body 1110 and a first structural beam 1130, wherein the box body 1110 has a accommodating space 1113 for accommodating the battery cell assembly 1120, the box body 1110 includes a surrounding box frame portion 1114, and a box wall surface 11141 of the box frame portion 1114 facing the accommodating space 1113 has two oppositely arranged first mortise and tenon grooves 11145; the first structural beam 1130 has two first mortise and tenon joints 1131, which are respectively formed at both ends of the first structural beam 1130 along the length direction, and the first structural beam 1130 is located in the accommodating space 1113, and the two first mortise and tenon joints 1131 are respectively corresponding to and plugged into the two opposite first mortise and tenon grooves 11145.

[0066] For the box body 1110, the box body 1110 usually adopts a hollow shell plate structure, and the hollow space inside the box body 1110 is the accommodation space 1113, and the battery cell assembly 1120 is accommodated in the accommodation space 1113. Since the battery cell assembly 1120 needs to enter and exit the box body 1110 during assembly and maintenance of the battery device 1100, the box body 1110 needs to be able to be opened. Therefore, the box body 1110 usually includes a first part 1111 and a second part 1112, the first part 1111 and the second part 1112 cover each other, and the first part 1111 and the second part 1112 jointly define the accommodation space 1113 for accommodating the battery cell assembly 1120. The second part 1112 may be a hollow structure with one end open, the first part 1111 may be a plate-like structure, and the first part 1111 covers the open side of the second part 1112, so that the first part 1111 and the second part 1112 jointly define the accommodating space 1113; the first part 1111 and the second part 1112 may also both be hollow structures with one side open, and the open side of the first part 1111 covers the open side of the second part 1112. Of course, the box body 1110 formed by the first part 1111 and the second part 1112 may be in various shapes, such as a cylinder, a cuboid, etc.

[0067] Among them, no matter which structural form the box body 1110 adopts, the box body 1110 needs to include a box frame portion 1114, and the box frame portion 1114 is a surrounding portion or an enclosed portion that forms the circumferential height of the box body 1110. For example, the box frame portion 1114 is placed horizontally, and the box frame portion 1114 refers to the annular frame portion surrounded by the vertical axis of the box body 1110. The upper and lower portions of the box frame portion 1114 can form an open opening. The box body 1110 can also include a box bottom 1117 and a box top (or a box cover portion) that are relatively arranged. The box bottom 1117 and the box top can be respectively covered on the two open openings of the box frame portion 1114, and the box bottom 1117 can be detachably or fixedly connected to the box frame portion 1114, and the box bottom 1117 can also be integrally prepared with the box frame portion 1114, and the box top can be detachably connected to the box frame portion 1114.

[0068] As for the box frame 1114, the box frame 1114 can be formed by surrounding a plate structure with a preset thickness, and the plate structure can be prepared by surrounding a hollow beam structure, so that the box frame 1114 can have a certain thickness. The side of the box frame 1114 facing the accommodating space 1113 forms a box wall surface 11141, which can be considered as the inner wall surface of the box body 1110 or the space side wall surface of the accommodating space 1113. The box wall surface 11141 is arranged opposite to the side surface of the battery cell assembly 1120 accommodated in the accommodating space 1113.

[0069] A first mortise and tenon groove 11145 is provided on the box wall surface 11141 of the box frame portion 1114. There are at least two first mortise and tenon grooves 11145. The two first mortise and tenon grooves 11145 must be arranged opposite to each other. For example, the cross-sectional outer contour of the box frame portion 1114 is rectangular, and it can be known that the box wall surface 11141 has four wall surface parts, and two of the four wall surface parts are parallel and opposite to each other. Among them, the first mortise and tenon grooves 11145 are respectively provided on two parallel and opposite wall surface parts, so that the first mortise and tenon grooves 11145 are arranged opposite to each other. The two wall surface parts are the wall surfaces opposite to the ends of the first structural beam 1130. When the box body 1110 is placed horizontally, the groove depth direction of the first mortise and tenon groove 11145 is the horizontal direction. It should be noted that the first mortise and tenon groove 11145 can be a groove structure, or a plurality of groove structures formed by combining and integrating a plurality of grooves.

[0070] The first structural beam 1130 can be understood as an expansion beam. The first structural beam 1130 has a preset length. The first structural beam 1130 has two ends along the length direction. For the convenience of description, the two ends can be defined as a first end and a second end, respectively. The first structural beam 1130 forms first tenon joints 1131 on the two ends, respectively, that is, the first end is formed with a first tenon joint 1131, and the second end is also formed with a first tenon joint 1131. The first tenon joint 1131 can be connected to the two ends of the first structural beam 1130 in a fixed or detachable manner, or the first tenon joint 1131 and the first structural beam 1130 are an integral structure formed in one piece.

[0071] When the first structural beam 1130 is assembled with the box frame portion 1114, the first structural beam 1130 is accommodated in the accommodating space 1113, and the two first tenon joints 1131 of the first structural beam 1130 are plugged into and matched with the corresponding two first mortise grooves 11145. Since the first mortise grooves 11145 are used to limit and position the first tenon joints 1131, it can be seen that the gap between the surface of the first tenon joint 1131 and the groove wall of the first mortise groove 11145 should be as small as possible. Fig.14 As shown, the gap between the surface of the first tenon joint 1131 and the groove wall of the first mortise groove 11145 is the first gap L1. Ideally, the first gap L1 should be 0 mm. In the actual manufacturing process, the first gap L1 can be between 0 mm and 3 mm. There is also a gap between the end face of the insertion end of the first tenon joint 1131 and the groove bottom of the first mortise groove 11145. The gap between the end face of the insertion end of the first tenon joint 1131 and the groove bottom of the first mortise groove 11145 is defined as the second gap L2, which can be 0 mm to 10 mm.

[0072] It should be pointed out that, in this example, the extrusion direction of the battery cell assembly 1120 on the first structural beam 1130 should be perpendicular to the length direction of the first structural beam 1130, that is, perpendicular to the groove depth direction of the first mortise and tenon groove 11145, so that the first mortise and tenon joint 1131 and the first structural beam 1130 are limited and positioned in the groove depth direction perpendicular to the first mortise and tenon groove 11145 through the first mortise and tenon groove 11145.

[0073] In this embodiment, by forming first mortise and tenon portions 1131 at both ends of the first structural beam 1130 respectively, and opening a first mortise and tenon groove 11145 on the box wall surface 11141 of the box body 1110 accordingly, when the first structural beam 1130 and the box body 1110 are assembled, the first mortise and tenon portion 1131 and the first mortise and tenon groove 11145 are connected by mortise and tenon insertion to limit the position, and then the box frame portion 1114 forms a certain cross-limiting portion between the ends of the first structural beam 1130, and the box frame portion 1114 forms a limiting wrapping for the end of the first structural beam 1130 outside the end of the first structural beam 1130 (referring to the first mortise and tenon portion 1131 at the end), so that the first structural beam 1130 is not easy to move in the groove depth direction perpendicular to the first mortise and tenon groove 11145, thereby improving the limiting stability and reliability of the box frame portion 1114 on the first structural beam 1130.

[0074] In some embodiments, reference Figure 7-11 As shown, the battery device 1100 also includes a second structural beam 1140 accommodated in the accommodating space 1113, and the second structural beam 1140 has two second mortise and tenon joints 1141, and the two second mortise and tenon joints 1141 are respectively formed at both ends of the second structural beam 1140 along the length direction; the box frame portion 1114 has two oppositely arranged second mortise and tenon grooves 11147 on the box wall surface 11141 facing the accommodating space 1113, and the two second mortise and tenon joints 1141 are respectively plugged and matched with the two opposite second mortise and tenon grooves 11147; the second structural beam 1140 and the first structural beam 1130 are cross-engaged.

[0075] Specifically, a second mortise and tenon groove 11147 is opened on the box wall surface 11141 of the box frame portion 1114, and two second mortise and tenon grooves 11147 are provided, and the two second mortise and tenon grooves 11147 must be arranged opposite to each other. For example, the outer contour of the cross section of the box frame portion 1114 is rectangular, then it can be known that the box wall surface 11141 has four wall portions, and the four wall portions are parallel and opposite to each other, wherein first mortise and tenon grooves 11145 are respectively opened on two parallel and opposite wall portions, so that the first mortise and tenon grooves 11145 are arranged opposite to each other, and second mortise and tenon grooves 11147 are respectively opened on the other two parallel and opposite wall portions. When the box body 1110 is placed horizontally, the groove depth direction of the first mortise groove 11145 and the second mortise groove 11147 is in the horizontal direction, and the groove depth direction of the first mortise groove 11145 and the groove depth direction of the second mortise groove 11147 form an angle greater than 0° and less than or equal to 90°. For example, if the angle is 90°, it can be known that the first structural beam 1130 and the second structural beam 1140 are arranged perpendicularly. It should be noted that the second mortise groove 11147 can be a groove structure, or a plurality of groove structures formed by combining and integrating a plurality of grooves.

[0076] The second structural beam 1140 can be an expansion beam or a non-expansion beam. The second structural beam 1140 has a preset length. The second structural beam 1140 has two ends along the length direction. For the convenience of description, the two ends can be defined as a third end and a fourth end, respectively. The second structural beam 1140 forms a second tenon joint 1141 on the two ends, respectively, that is, the third end is formed with a second tenon joint 1141, and the fourth end is also formed with a second tenon joint 1141. The second tenon joint 1141 can be connected to the two ends of the second structural beam 1140 in a fixed or detachable manner, or the second tenon joint 1141 and the second structural beam 1140 are an integral structure formed in one piece.

[0077] When the second structural beam 1140 is assembled with the box frame portion 1114, the second structural beam 1140 is accommodated in the accommodating space 1113, and the two second tenon joints 1141 of the second structural beam 1140 are plugged into and matched with the corresponding two second mortise grooves 11147. At the same time, the first structural beam 1130 and the second structural beam 1140 are cross-connected, and the first structural beam 1130 and the second structural beam 1140 are arranged to interlock with each other at the intersection position, so that the first structural beam 1130 and the second structural beam 1140 can be at the same height as much as possible in the vertical direction, and the height occupied in the vertical direction is as small as possible.

[0078] Since the first mortise and tenon groove 11145 limits and positions the first tenon portion 1131, and at the same time, the second mortise and tenon groove 11147 limits and positions the second tenon portion 1141, a mutually interlocking mortise and tenon connection structure is formed between the first structural beam 1130, the second structural beam 1140 and the box frame portion 1114, and the first structural beam 1130, the second structural beam 1140 and the box frame portion 1114 have a self-locking feature, which is beneficial to improving the connection reliability between the first structural beam 1130, the second structural beam 1140 and the box frame portion 1114.

[0079] Among them, the second tenon joint 1141 is inserted into the second mortise groove 11147, and the gap between the surface of the second tenon joint 1141 and the groove wall of the second mortise groove 11147 should be as small as possible. The gap between the surface of the second tenon joint 1141 and the groove wall of the second mortise groove 11147 is defined as the third gap. In an ideal state, the third gap should be 0mm. In the actual manufacturing process, the third gap can be between 0mm-3mm. There will also be a gap between the end face of the insertion end of the second tenon joint 1141 and the groove bottom of the second mortise groove 11147. The gap between the end face of the insertion end of the second tenon joint 1141 and the groove bottom of the second mortise groove 11147 is defined as the fourth gap, and the fourth gap can be 0mm-10mm.

[0080] In this embodiment, by adding a second structural beam 1140 and making the second structural beam 1140 cross-engaged with the first structural beam 1130, and by connecting the second mortise and tenon joints 1141 at both ends of the second structural beam 1140, the mortise and tenon joint limiting of the second structural beam 1140 and the box frame portion 1114 is achieved, and the first structural beam 1130, the second structural beam 1140 and the box frame portion 1114 have a self-locking feature, which is beneficial to improving the connection reliability between the first structural beam 1130, the second structural beam 1140 and the box frame portion 1114.

[0081] In some embodiments, reference Fig. 9 , Fig.12 and Fig.13 As shown, the box body 1110 also includes a box bottom 1117 for supporting the battery cell assembly 1120, and the box bottom 1117 is connected to the box frame 1114. A first bite groove 1136 is provided on the side of the first structural beam 1130 away from the box bottom 1117. Corresponding to the first bite groove 1136, a second bite groove 1144 is provided on the side of the second structural beam 1140 close to the box bottom 1117. The first structural beam 1130 and the second structural beam 1140 are cross-engaged at the positions of the first bite groove 1136 and the second bite groove 1144.

[0082] Specifically, since the first structural beam 1130 is designed as an expansion beam, the extrusion force of the battery cell assembly 1120 is perpendicular to the first structural beam 1130, so the first structural beam 1130 is arranged closer to the box bottom 1117, and the side of the first structural beam 1130 close to the box bottom 1117 can be connected to the surface of the box bottom 1117, and the first structural beam 1130 and the box bottom 1117 can be further reinforced by bonding, welding, fastening assembly connection, etc. Therefore, a first bite groove 1136 is opened on the side of the first structural beam 1130 away from the box bottom 1117, so that the second structural beam 1140 is plugged and matched with the first structural beam 1130 from the upper part, so it can be known that the first bite groove 1136 is a through groove that penetrates along the length direction of the second structural beam 1140.

[0083] Therefore, it can be known that the second structural beam 1140 has a second bite groove 1144 on the side facing or close to the box bottom 1117, and the first bite groove 1136 and the second bite groove 1144 are arranged correspondingly, so that the first structural beam 1130 and the second structural beam 1140 can be bite-connected at the positions of the first bite groove 1136 and the second bite groove 1144. Therefore, it can be known that the second bite groove 1144 is a through groove that penetrates along the length direction of the first structural beam 1130; the side of the second structural beam 1140 close to or facing the box bottom 1117 can also be in contact with or fixedly connected to the box bottom 1117. Among them, the second structural beam 1140 can also be an expansion beam that can withstand the effect of extrusion force.

[0084] At the position where the first structural beam 1130 and the second structural beam 1140 intersect and engage, the first structural beam 1130 and the second structural beam 1140 can be fixed by bonding, welding, etc., or a fastening component can be added at this position to further reinforce the first structural beam 1130 and the second structural beam 1140 by the fastening component.

[0085] In this embodiment, the first structural beam 1130 is cross-engaged with the second structural beam 1140 at a side position closer to the box bottom 1117, which is beneficial to improving the anti-extrusion ability of the first structural beam 1130 and the anti-deformation ability of the first structural beam 1130.

[0086] In one embodiment, referring to Figure 8 , Fig. 9 and Fig.11As shown, protruding structural members 11150 are provided on two box wall surfaces 11141 of the box frame portion 1114 which are respectively opposite to the two ends of the second structural beam 1140, and two second mortise and tenon joints 11147 are respectively opened on the two structural members 11150 and extend into the box wall surfaces 11141, and at least one second mortise and tenon joint 11147 penetrates to the top surface of the structural member 11150 along the height direction.

[0087] Specifically, the structural member 11150 is a structure protruding from the box wall 11141. The structural member 11150 can be integrally formed with the box frame 1114, or the structural member 11150 can be connected to the box frame 1114 in a fixed or detachable manner. The structural member 11150 is protruding toward the accommodating space 1113. On the one hand, the structural member 11150 is used to enhance the structural strength of the box frame 1114. On the other hand, the structural member 11150 is also used to support the protruding structures on the outer surface of the battery cell assembly 1120, such as protruding electronic components, electrical plug components, wire bodies and other components. The height of the structural member 11150 can be less than the height of the top surface of the box frame 1114, so that a accommodating space is formed above the structural member 11150 to accommodate components such as wire bodies.

[0088] The two second mortise and tenon grooves 11147 are respectively opened on the two structural members 11150. The second mortise and tenon grooves 11147 can extend to the box wall surface 11141 and extend to the inside of the box wall body 11142 in the box frame portion 1114 in the groove depth direction (that is, extend to the second cavity 11144 described below). The top surface of the structural member 11150 refers to the surface of the side of the structural member 11150 away from the box bottom 1117. The height direction can refer to the direction perpendicular to the box bottom 1117 or the second direction described below. The second mortise and tenon grooves 11147 penetrate to the top surface of the structural member 11150 in the height direction to form a through opening. Among the two second mortise and tenon grooves 11147, one of the second mortise and tenon grooves 11147 penetrates to the top surface of the structural member 11150, or both of the second mortise and tenon grooves 11147 penetrate to the top surface of the structural member 11150.

[0089] In this embodiment, the structural member 11150 can enhance the structural strength of the box frame portion 1114. Opening the second mortise and tenon groove 11147 on the structural member 11150 can protect the box frame portion 1114, reduce damage to the overall structural strength of the box frame portion 1114, and help to improve the overall rigidity and strength of the box body 1110.

[0090] In some embodiments, reference Figure 8 As shown, the first tenon portion 1131 and the box frame portion 1114 are welded.

[0091] Specifically, the contact position between the first tenon joint 1131 and the box frame 1114 can be welded and fixed, for example, the edge position and the gap position of the first tenon joint 1131 that are plugged into the first mortise groove 11145 are welded, and the welding position is defined as the first welding position 1500. The position where the first structural beam 1130 is connected to the box frame 1114 and the box bottom 1117 can also be welded and fixed.

[0092] In some embodiments, reference Figure 8 As shown, the second tenon portion 1141 and the box frame portion 1114 are welded.

[0093] Specifically, the contact position between the second tenon joint 1141 and the box frame 1114 can be welded and fixed, for example, the edge position and the gap position of the second tenon joint 1141 that are plugged into the second mortise groove 11147 are welded, and the welding position is defined as the second welding position 1600. The position where the second structural beam 1140 is connected to the box frame 1114 and the box bottom 1117 can also be welded and fixed.

[0094] In this embodiment, welding is performed at the positions where the first tenon joint 1131 and the second tenon joint 1141 are respectively connected to the box frame portion 1114 , which is beneficial to enhancing the structural strength between the first tenon joint 1131 , the second tenon joint 1141 and the box frame portion 1114 .

[0095] In some embodiments, reference Figure 4-6 and Fig.14 As shown, the box frame portion 1114 includes a box wall body 11142, and the box wall body 11142 is a hollow structure. A first cavity 11143 is formed inside the box wall body 11142, and a first mortise and tenon joint 11145 is opened on the box wall body 11142 and passes through the first cavity 11143; the box body 1110 also includes a first support rib 1115, and the first support rib 1115 is arranged in the first cavity 11143 and connected to the cavity wall of the first cavity 11143, and the first support rib 1115 is abutted against the first mortise and tenon joint 1131.

[0096] Specifically, the box frame portion 1114 may include a box wall body 11142 or a plurality of box wall bodies 11142 that are connected in sequence and arranged in a circle around the central axis of the box body 1110. For example, the box frame portion 1114 includes a box wall body 11142, then the outer contour shape of the box frame portion 1114 may be circular or elliptical; for another example, the box frame portion 1114 includes four box wall bodies 11142 that are connected in sequence and arranged in a circle around the central axis of the box body 1110, then the outer contour shape of the box frame portion 1114 is a rectangle.

[0097] The box wall 11142 is a hollow structure, for example, the box wall 11142 is a hollow beam structure, a hollow shell plate structure or a cylinder structure, etc. The box wall 11142 can be formed by surrounding a plate structure, or by stretching a stretching process. The hollow portion inside the box wall 11142 forms a first cavity 11143, and the first cavity 11143 can extend through the entire extension length of the box wall 11142, or the first cavity 11143 can be a part of the area inside the box wall 11142, and the extension length of the first cavity 11143 is less than or equal to the entire extension length of the box wall 11142, and the first cavity 11143 can extend linearly in the box wall 11142.

[0098] For the first mortise and tenon groove 11145, the first mortise and tenon groove 11145 is opened on the box wall body 11142, and the groove opening of the first mortise and tenon groove 11145 is located on the box wall surface 11141 of the box wall body 11142 facing the accommodating space 1113. The first mortise and tenon groove 11145 is connected with the first cavity 11143 inside the box wall body 11142, and the groove depth direction of the first mortise and tenon groove 11145 can be perpendicular to the extension length direction of the first cavity 11143 in the box wall body 11142.

[0099] The box body 1110 further includes a first support rib 1115, which may be a plate-shaped structure. The first support rib 1115 is connected to the box wall 11142 to increase the rigidity and strength of the box wall 11142. The first support rib 1115 is located in the first cavity 11143 of the box wall 11142, and the first support rib 1115 is connected to the cavity wall of the first cavity 11143. The first support rib 1115 and the cavity wall may be fixed by welding, or the first support rib 1115 and the box wall 11142 may be integrally formed. After the first tenon joint 1131 is inserted into the first mortise groove 11145, the first support rib 1115 will abut against the surface of the first tenon joint 1131 to limit and support the first tenon joint 1131. According to the relative positions of the first mortise and tenon groove 11145 and the first cavity 11143, it can be understood that the first support rib 1115 supports and limits the first tenon joint 1131 in the direction of the groove depth perpendicular to the first mortise and tenon groove 11145, that is, the direction of the supporting force of the first support rib 1115 on the first tenon joint 1131 is parallel to the direction of the extrusion force of the battery cell assembly 1120 exerted on the first structural beam 1130, so that when the battery cell assembly 1120 expands thermally, the first support rib 1115 can further support the first tenon joint 1131 and the first structural beam 1130, thereby enhancing the deformation resistance of the box wall 11142 and improving the stability and reliability of the connection between the first tenon joint 1131 and the box wall 11142.

[0100] In this embodiment, a first supporting rib 1115 is added to the first cavity 11143 of the box wall 11142 so that the first supporting rib 1115 can abut against the first mortise and tenon joint 1131. When the first structural beam 1130 is subjected to the squeezing force of the battery cell assembly 1120, the deformation resistance of the box wall 11142 is improved, and the stability and reliability of the connection between the first mortise and tenon joint 1131 and the box wall 11142 are improved.

[0101] In some embodiments, reference Figure 4-6 and Fig.14 As shown, the box wall body 11142 includes a first box wall 11148 and a second box wall 11149 that are arranged opposite to each other, the first box wall 11148 is arranged toward the accommodating space 1113, and the notch of the first mortise and tenon 11145 is opened on the first box wall 11148; the first support rib body 1115 includes a first support plate 11151 accommodated in the first cavity 11143, and the first support plate 11151 is connected between the first box wall 11148 and the second box wall 11149.

[0102] Specifically, the first box wall 11148 and the second box wall 11149 are two box walls that are opposite and spaced apart. The two box bodies 1110 can both be flat. For example, the outer contour of the cross section of the box wall body 11142 is rectangular. When the box body 1110 is placed horizontally, the first box wall 11148 and the second box wall 11149 are two opposite side walls of the box wall body 11142. Among them, the first box wall 11148 is the box wall close to the side of the accommodating space 1113, so it can be It is known that the slot of the first mortise and tenon groove 11145 is located on the first box wall 11148, and the first tenon and tenon portion 1131 is inserted into the first mortise and tenon groove 11145 through the slot, and the end face of the insertion end of the first tenon and tenon portion 1131 and the bottom of the first mortise and tenon groove 11145 can be abutted against each other or there is a second gap L2, and the bottom of the first mortise and tenon groove 11145 is the wall surface of the second box wall 11149, and the second gap L2 can be any value between 0mm-10mm.

[0103] The first support rib 1115 at least includes a first support plate 11151, which is respectively connected to the first box wall 11148 and the second box wall 11149 in the first cavity 11143. The first support plate 11151 can be welded to the first box wall 11148 and the second box wall 11149, or the first support plate 11151 can be integrally formed with the first box wall 11148 and the second box wall 11149. When the plate surfaces of the first box wall 11148 and the second box wall 11149 are both arranged in the vertical direction, the first support plate 11151 can be arranged at an angle to the first box wall 11148 and the second box wall 11149 respectively. For example, the first support plate 11151 is respectively perpendicular to the first box wall 11148 and the second box wall 11149. It can be seen that the first support plate 11151 is horizontally arranged, and the battery cell assembly 1120 is placed vertically. The extrusion pressure of the battery cell assembly 1120 on the first tenon joint 1131 is in the horizontal direction. When the first tenon joint 1131 is subjected to the extrusion pressure in the horizontal direction, the first support plate 11151 supports the first tenon joint 1131 in the horizontal direction.

[0104] It should be noted that the first support plate 11151 may include multiple supporting parts. For example, the first support plate 11151 includes a first plate body and a second plate body. The first plate body and the second plate body are respectively located on both sides of the first mortise and tenon groove 11145 or the first tenon joint 1131, so as to simultaneously abut and support the opposite side surfaces of the first tenon joint 1131.

[0105] In this embodiment, the first supporting rib 1115 adopts a first supporting plate 11151 connected between the first box wall 11148 and the second box wall 11149. The first supporting plate 11151 can abut and support the first mortise and tenon joint 1131 while improving the anti-deformation ability between the first box wall 11148 and the second box wall 11149, thereby improving the structural strength and rigidity of the box wall body 11142.

[0106] In some embodiments, reference Figure 4-6 and Fig.14 As shown, the first support rib 1115 also includes a second support plate 11152 accommodated in the first cavity 11143 and connected to the box wall 11142. The second support plate 11152 is connected to the cavity wall of the first cavity 11143 and cross-connected with the first support plate 11151.

[0107] Specifically, the second support plate 11152 is also accommodated in the first cavity 11143 and cross-connected with the first support plate 11151. The first support plate 11151 and the second support plate 11152 are arranged at an angle, and the range of the angle is greater than 0° and less than or equal to 90°. For example, if the angle is 90°, it can be seen that the first support plate 11151 and the second support plate 11152 are arranged vertically, that is, the first support plate 11151 and the second support plate 11152 are arranged cross-wise, and the second support plate 11152 is also connected to the box wall 1 1142, for example, the outer contour of the cross section of the box wall 11142 is rectangular, then the box wall 11142 also includes a third box wall and a fourth box wall that are relatively and spaced apart, and the third box wall and the fourth box wall are both perpendicular to the first box wall 11148 and the second box wall 11149. The second support plate 11152 is parallel to the first box wall 11148 and the second box wall 11149 and perpendicularly crosses the first support plate 11151, thereby improving the structural strength and rigidity of the first support rib 1115, and improving the deformation resistance of itself and the box wall 11142. Of course, the angle between the first support plate 11151 and the second support plate 11152 can also be 15°, 30°, 45°, 60°, 75°, etc., and the angle can be any value between 0°-90° (excluding 0°).

[0108] In this embodiment, by further adding a second support plate 11152 and combining it with the first support plate 11151, the support strength of the first mortise and tenon joint 1131 and the first structural beam 1130 is further improved, and the strength, rigidity and deformation resistance of the box wall 11142 are improved.

[0109] In some embodiments, reference Figure 4-6 As shown, the first structural beam 1130 includes a first beam body 1133 and a second beam body 1134 extending in the same direction. The first beam body 1133 and the second beam body 1134 are arranged side by side and connected in the height direction. The two extending ends of the first beam body 1133 are respectively connected to the first mortise and tenon joints 1131, and the two extending ends of the second beam body 1134 are both in contact with the wall surface of the first box wall 11148.

[0110] For the first structural beam 1130, the first structural beam 1130 includes two parts, namely, a first beam body 1133 and a second beam body 1134. The first beam body 1133 and the second beam body 1134 extend in the same direction and are arranged side by side and connected in the height direction. For example, the first beam body 1133 and the second beam body 1134 are both extended along the first direction, and the first beam body 1133 and the second beam body 1134 are arranged in the second direction, the second direction is perpendicular to the first direction, the first direction is the length direction of the first beam body 1133 and the second beam body 1134, and the second direction can be considered as the height direction of the first beam body 1133 and the second beam body 1134. It can be seen that the first beam body 1133 and the second beam body 1134 are arranged side by side. The height direction can also be understood as the above-mentioned direction perpendicular to the bottom 1117 of the box.

[0111] As for the connection position of the first tenon joint 1131, the two first tenon joints 1131 are respectively connected to the two extension ends of the first beam body 1133, so that the first tenon joint 1131 protrudes outside the extension end of the second beam body 1134, forming a protruding plug-in portion. When the first structural beam 1130 is assembled with the box body 1110, the two first tenon joints 1131 are respectively plugged into two opposite first mortise grooves 11145, and the end faces of the two extension ends of the second beam body 1134 abut against the wall surface of the first box wall 11148 at the outer periphery of the notch of the first mortise groove 11145. It can be seen that the end faces of the two extension ends of the second beam body 1134 are the abutting surfaces 11341 that contact the wall surface of the first box wall 11148.

[0112] For example, the box body 1110 is placed horizontally, and the box body 1110 also has a bottom wall. The first beam body 1133 is located above the second beam body 1134, and the second beam body 1134 can be connected to the bottom wall of the box. The lower surface of the second beam body 1134 can be flush with the bottom wall of the box. There is a preset spacing distance between the side groove wall of the first mortise and tenon groove 11145 close to the bottom wall of the box and the upper surface of the bottom wall of the box. The height of the first beam body 1133 in the vertical direction is vertically equal to the preset spacing distance, so that after the first mortise and tenon portion 1131 is inserted into the first mortise and tenon groove 11145, the second beam body 1134 can be in contact with the bottom wall of the box. It can be seen that the first structural beam 1130 is divided into two upper and lower beam parts, wherein the upper first beam body 1133 is used to connect the first mortise and tenon portion 1131, and the end face of the lower second beam body 1134 can abut against the first box wall 11148. The first mortise and tenon portion 1131 forms a step shape at both ends of the first structural beam 1130, and the protruding step portion is the first mortise and tenon portion 1131.

[0113] When the first tenon joint 1131 is inserted into the first mortise groove 11145, the end face of the second beam body 1134 contacts and abuts against the wall surface of the first box wall 11148, and the first box wall 11148 plays a role in abutting, supporting and limiting the second beam body 1134 and the first structural beam 1130.

[0114] It can be seen that the first mortise and tenon groove 11145 is opened in the middle area of ​​the first box wall 11148, and the first mortise and tenon groove 11145 does not penetrate to the edge of the first box wall 11148, so it is not easy to destroy the overall structural strength and rigidity of the first structural beam 1130, so that the first structural beam 1130 can maintain the original structural strength and rigidity as much as possible, which is beneficial to improve the stability and reliability of the connection between the first box wall 11148 and the first mortise and tenon joint 1131 and the first structural beam 1130.

[0115] In this embodiment, when the first structural beam 1130 is connected to the box body 1110, the first tenon joint 1131 at the end of the first beam body 1133 is inserted into the first mortise and tenon groove 11145, and the extended end face of the second beam body 1134 can abut against the wall surface of the first box wall 11148, thereby increasing the connection area between the first structural beam 1130 and the first box wall 11148, which is beneficial to improving the connection reliability between the first structural beam 1130 and the first box wall 11148, and can provide more possibilities for setting more connection structures (such as welding structures) between the first structural beam 1130 and the first box wall 11148.

[0116] In some embodiments, reference Figure 4-6 As shown, the first mortise and tenon portions 1131 protrude along the width direction of the first structural beam 1130 to form first step portions 11311, and corresponding to the two first step portions 11311, second step portions 11146 are formed on the two opposite groove walls of the first mortise and tenon groove 11145, and the first step portions 11311 are matched and plugged in with the second step portions 11146.

[0117] Specifically, the two first step portions 11311 are respectively protruding portions of the first tenon portion 1131 protruding on both sides of the first structural beam 1130. For example, the extension direction of the first structural beam 1130 is the first direction, the first beam body 1133 and the second beam body 1134 are arranged in the second direction, the second direction is perpendicular to the first direction, and the second direction can be understood as the height direction. Then the first step portion 11311 protrudes outside the first beam body 1133 along a third direction, the third direction is perpendicular to the first direction and the second direction, and the third direction can be understood as the width direction. For example, the battery device is placed horizontally, the first direction is the horizontal direction, the second direction is the vertical direction, and the third direction is also the horizontal direction and perpendicular to the first direction.

[0118] The third direction can be considered as the width direction of the first beam body 1133 or the second beam body 1134 or the first structural beam 1130. Therefore, the first mortise and tenon joint 1131 forms a first step portion 11311 protruding from the surface of the first beam body 1133 and the second beam body 1134 along the width direction of the first structural beam 1130, and the cross-sectional outer contour shape of the first step portion 11311 can be arc-shaped or polygonal, for example, rectangular.

[0119] Second step portions 11146 are respectively formed on two opposite groove walls of the first mortise and tenon groove 11145 corresponding to the two first step portions 11311. The two groove walls are respectively two groove walls of the first mortise and tenon groove 11145 in the third direction. When the first mortise and tenon joint 1131 is inserted into the first mortise and tenon groove 11145, the first step portion 11311 and the second step portion 11146 are complementarily engaged and connected. For example, the first step portion 11311 forms a first step surface on the lower surface, and the second step portion 11146 forms a second step surface on the upper surface. Both the first step surface and the second step surface are horizontal surfaces. When the first mortise and tenon joint 1131 is inserted into the first mortise and tenon groove 11145, the first step surface and the second step surface are fitted and abutted against each other.

[0120] In this embodiment, by respectively providing the first step portions 11311 on both side surfaces of the first tenon portion 1131, and correspondingly providing the second step portions 11146 on the two side walls of the first mortise groove 11145, the first step portion 11311 and the second step portion 11146 are engaged and plugged together, thereby facilitating improving the positioning accuracy when the first tenon portion 1131 and the first mortise groove 11145 are plugged together, and improving the connection reliability between the first tenon portion 1131 and the first mortise groove 11145.

[0121] In some embodiments, reference Figure 4 and Figure 5 As shown, the first step portion 11311 extends from the first tenon portion 1131 to the first beam body 1133 .

[0122] Specifically, the first step portion 11311 extends from the first tenon portion 1131 to the first beam body 1133, and the first step portions 11311 are respectively formed on the two sides of the first tenon portion 1131, and the first step portions 11311 are also formed on the two sides of the first beam body 1133, and the two first step portions 11311 are an integrated structure. The first step portion 11311 can extend from the first tenon portion 1131 to the first beam body 1133 and cover the entire extension length of the first beam body 1133.

[0123] In this embodiment, extending the first step portion 11311 onto the first beam body 1133 can facilitate the integral preparation and molding of the first step portion 11311, the first beam body 1133 and the first structural beam 1130, thereby improving the convenience of preparing the first structural beam 1130.

[0124] In some embodiments, the first beam body 1133 and the second beam body 1134 are detachably connected.

[0125] For example, the first beam body 1133 and the second beam body 1134 can be connected and fixed by fasteners, for example, the fasteners can be bolt assemblies, etc. The use of a detachable connection method is beneficial to improving the convenience of installation and disassembly between the first beam body 1133 and the second beam body 1134, making the assembly and disassembly of the first structural beam 1130 more flexible.

[0126] In some embodiments, the first beam body 1133 is welded to the second beam body 1134. The welding method is conducive to improving the reliability of the connection between the first beam body 1133 and the second beam body 1134.

[0127] In some embodiments, the first beam body 1133 and the second beam body 1134 are integrally formed. The integrally formed structure is easier to manufacture, reduces the assembly process between the first beam body 1133 and the second beam body 1134, and is conducive to reducing the manufacturing cost of the first structural beam 1130.

[0128] In this embodiment, the first beam body 1133 and the second beam body 1134 can be connected in a variety of ways, which is beneficial to improving the flexibility of the overall structure of the first structural beam 1130 and improving the convenience during assembly and manufacturing.

[0129] In some embodiments, reference Figure 4-6 As shown, the first structural beam 1130 and the first mortise and tenon joint 1131 are both hollow structures. A first cavity 1132 is formed inside the first structural beam 1130 and passes through the first mortise and tenon joint 1131. A first structural rib 1135 is arranged in the first cavity 1132 and is connected to the cavity wall of the first cavity 1132.

[0130] Specifically, the first structural beam 1130 and the first tenon joint 1131 are both hollow structures, and the cross-sectional outer contour of the first structural beam 1130 may be circular, elliptical or polygonal. The first structural beam 1130 may be a hollow beam structure, a hollow shell plate structure or a cylindrical structure, etc. The first structural beam 1130 may be formed by surrounding a plate structure, or by stretching by a stretching process, and the first tenon joint 1131 may be integrally formed with the first structural beam 1130. The hollow portion inside the first structural beam 1130 forms a first cavity 1132, which extends to the first mortise and tenon portion 1131. The first cavity 1132 may extend through the entire extension length of the first structural beam 1130, or the first cavity 1132 may be a portion of the interior of the first structural beam 1130. The extension length of the first cavity 1132 is less than or equal to the entire extension length of the first structural beam 1130. The first cavity 1132 may extend linearly in the first structural beam 1130, and the hollow portion in the middle of the first mortise and tenon portion 1131 is also the first cavity 1132.

[0131] The box body 1110 also includes a first structural rib 1135, which can be a plate-like structure. The first structural rib 1135 is connected to the beam wall of the first structural beam 1130 and the wall of the first tenon joint 1131 to increase the rigidity and strength of the first structural beam 1130 and the first tenon joint 1131. The first structural rib 1135 is located in the cavity of the first structural beam 1130 and the first tenon joint 1131, and the first structural rib 1135 is connected to the cavity wall of the cavity. The first structural rib 1135 and the cavity wall can be fixed by welding, or the first structural rib 1135, the first structural beam 1130 and the first tenon joint 1131 are integrally formed, and the first structural rib 1135 can be flush with the end face of the plug-in end of the first tenon joint 1131.

[0132] Since the first structural beam 1130 and the first tenon joint 1131 are both hollow structures, in order to enhance the rigidity, strength and deformation resistance of the first structural beam 1130 and the first tenon joint 1131, a first structural reinforcement 1135 is added in the first cavity 1132. The first structural reinforcement 1135 plays a supporting role in the first cavity 1132. When the outer surfaces of the first structural beam 1130 and the first tenon joint 1131 are subjected to the extrusion force of the battery cell assembly 1120, the first structural reinforcement 1135 can provide support, thereby reducing the deformation of the first structural beam 1130 and the first tenon joint 1131 and improving their deformation resistance.

[0133] In this embodiment, the first structural beam 1130 and the first tenon joint 1131 adopt a hollow structure, which is beneficial to reducing weight and achieving lightweight battery device 1100. Adding the first structural rib 1135 in the cavity is beneficial to enhancing the deformation resistance of the first structural beam 1130 and the first tenon joint 1131.

[0134] In some embodiments, reference Figure 8-11 As shown, the box frame portion 1114 includes a box wall body 11142, and the box wall body 11142 is a hollow structure. A second cavity 11144 is formed inside the box wall body 11142, and a second mortise and tenon groove 11147 is opened on the box wall body 11142 and passes through the second cavity 11144; the box body 1110 also includes a second support rib 1116, and the second support rib 1116 is arranged in the second cavity 11144 and connected to the cavity wall of the second cavity 11144, and the second support rib 1116 is abutted against the second mortise and tenon portion 1141.

[0135] Specifically, for the structural form of the box frame 1114 and the box wall 11142, reference can be made to the above embodiments, which will not be repeated here. The hollow portion inside the box wall 11142 forms a second cavity 11144, which can be arranged to be interlinked with the first cavity 11143, or the second cavity 11144 and the first cavity 11143 are two independent cavities, and the second cavity 11144 can be a part of the area inside the box wall 11142, the extension length of the first cavity 11143 is less than the entire extension length of the box wall 11142, and the second cavity 11144 can extend linearly in the box wall 11142.

[0136] For the second mortise and tenon groove 11147, the second mortise and tenon groove 11147 is opened on the box wall body 11142, and the groove opening of the second mortise and tenon groove 11147 is located on the box wall surface 11141 of the box wall body 11142 facing the accommodating space 1113. The second mortise and tenon groove 11147 is connected with the second cavity 11144 inside the box wall body 11142, and the groove depth direction of the second mortise and tenon groove 11147 can be perpendicular to the extension length direction of the second cavity 11144 in the box wall body 11142.

[0137] The box body 1110 further includes a second support rib 1116, which may be a plate-shaped structure. The second support rib 1116 is connected to the box wall 11142 to increase the rigidity and strength of the box wall 11142. The second support rib 1116 is located in the second cavity 11144 of the box wall 11142, and the second support rib 1116 is connected to the cavity wall of the second cavity 11144. The second support rib 1116 and the cavity wall may be fixed by welding, or the second support rib 1116 and the box wall 11142 may be integrally formed. After the second tenon joint 1141 is inserted into the second mortise groove 11147, the second support rib 1116 will abut against the surface of the second tenon joint 1141 to limit and support the second tenon joint 1141. According to the relative positions of the second mortise and tenon groove 11147 and the second cavity 11144, it can be understood that the second supporting rib 1116 supports and limits the second tenon joint 1141 in the groove depth direction perpendicular to the second mortise and tenon groove 11147, thereby improving the stability and reliability of the connection between the first tenon joint 1131 and the box wall 11142.

[0138] In this embodiment, a second supporting rib 1116 is added to the second cavity 11144 of the box wall 11142 so that the second supporting rib 1116 can abut against the second mortise and tenon joint 1141. When the second structural beam 1140 is subjected to a force, the deformation resistance of the box wall 11142 is improved, and the stability and reliability of the connection between the second mortise and tenon joint 1141 and the box wall 11142 are improved.

[0139] In some embodiments, reference Figure 8-11 As shown, the second supporting rib 1116 includes a third supporting plate 11161 accommodated in the second cavity 11144 , and the third supporting plate 11161 is connected to the cavity wall of the second cavity 11144 .

[0140] As for the structure of the box wall body 11142, the box wall body 11142 includes a first box wall 11148 and a second box wall 11149 which are arranged opposite to each other. The first box wall 11148 is arranged toward the accommodating space 1113, and the notch of the second mortise groove 11147 is opened on the first box wall 11148. The structural form of the first box wall 11148 and the second box wall 11149 can refer to the above embodiment, which will not be repeated here. The notch of the second mortise groove 11147 is located on the first box wall 11148, and the second tenon joint 1141 is inserted into the second mortise groove 11147 through the notch. The insertion end surface of the second tenon joint 1141 and the bottom of the second mortise groove 11147 can be arranged in contact with each other or there is a fourth gap, and the fourth gap can be any value between 0mm and 10mm.

[0141] The second support rib 1116 at least includes a third support plate 11161, and the third support plate 11161 is connected to the first box wall 11148 and the second box wall 11149 in the second cavity 11144. The third support plate 11161 can be welded to the first box wall 11148 and the second box wall 11149, or the third support plate 11161 can be integrally formed with the first box wall 11148 and the second box wall 11149. When the plate surfaces of the first box wall 11148 and the second box wall 11149 are both arranged in the vertical direction, the third support plate 11161 can be arranged at an angle with the first box wall 11148 and the second box wall 11149, for example, the third support plate 11161 is arranged perpendicular to the first box wall 11148 and the second box wall 11149, and the third support plate 11161 supports the second mortise and tenon joint 1141 in the horizontal direction.

[0142] It should be noted that the third support plate 11161 may include multiple supporting parts. For example, the third support plate 11161 includes a third plate body and a fourth plate body. The third plate body and the fourth plate body are respectively located on both sides of the second mortise groove 11147 or the second tenon joint 1141, so as to simultaneously abut and support the opposite side surfaces of the second tenon joint 1141.

[0143] In this embodiment, the second supporting rib 1116 adopts a third supporting plate 11161 connected between the first box wall 11148 and the second box wall 11149. The third supporting plate 11161 can abut and support the second mortise and tenon joint 1141 while improving the anti-deformation ability between the first box wall 11148 and the second box wall 11149, thereby improving the structural strength and rigidity of the box wall body 11142.

[0144] In some embodiments, reference Figure 8-11 As shown, the second support rib 1116 also includes a fourth support plate 11162 accommodated in the second cavity 11144 and connected to the box wall 11142 . The fourth support plate 11162 is connected to the cavity wall of the second cavity 11144 and cross-connected with the third support plate 11161 .

[0145] Specifically, the fourth support plate 11162 is also accommodated in the second cavity 11144 and cross-connected with the third support plate 11161. The fourth support plate 11162 and the third support plate 11161 are arranged at an angle, and the range of the angle is greater than 0° and less than or equal to 90°. For example, if the angle is 90°, it can be seen that the third support plate 11161 and the fourth support plate 11162 are arranged vertically, that is, the third support plate 11161 and the fourth support plate 11162 are arranged cross-wise, and the fourth support plate 11162 is also connected to the box wall. On the body 11142, for example, the cross-sectional outer contour of the box wall body 11142 is rectangular, then the box wall body 11142 also includes a third box wall and a fourth box wall that are relatively and spaced apart, and the third box wall and the fourth box wall are both perpendicular to the first box wall 11148 and the second box wall 11149. The fourth support plate 11162 is parallel to the first box wall 11148 and the second box wall 11149 and perpendicularly crosses the third support plate 11161, thereby improving the structural strength and rigidity of the third support rib body, and improving the deformation resistance of itself and the box wall body 11142. Of course, the angle between the third support plate 11161 and the fourth support plate 11162 can also be 15°, 30°, 45°, 60°, 75°, etc., and the angle can be any value between 0°-90° (excluding 0°).

[0146] In this embodiment, by further adding a fourth support plate 11162 and combining it with the third support plate 11161, the support strength of the second mortise and tenon joint 1141 and the second structural beam 1140 is further improved, and the strength, rigidity and deformation resistance of the box wall 11142 are improved.

[0147] In some embodiments, reference Figure 8-11 As shown, the second structural beam 1140 and the second mortise and tenon joint 1141 are both hollow structures. A second cavity 1142 is formed inside the second structural beam 1140 and passes through the second mortise and tenon joint 1141. A second structural rib 1143 is arranged in the second cavity 1142 and is connected to the cavity wall of the second cavity 1142.

[0148] Specifically, the second structural beam 1140 and the second tenon joint 1141 are both hollow structures, and the cross-sectional outer contour of the second structural beam 1140 may be circular, elliptical or polygonal. The second structural beam 1140 may be a hollow beam structure, a hollow shell plate structure or a cylindrical structure, etc. The second structural beam 1140 may be formed by surrounding a plate structure, or by stretching by a stretching process, and the second tenon joint 1141 may be integrally formed with the second structural beam 1140. The hollow portion inside the second structural beam 1140 forms a second cavity 1142, and the second cavity 1142 extends to the second tenon joint 1141. The second cavity 1142 may be a portion of the interior of the second structural beam 1140. The extension length of the second cavity 1142 is less than or equal to the entire extension length of the second structural beam 1140. The second cavity 1142 may extend linearly in the second structural beam 1140, and the hollow portion in the middle of the second tenon joint 1141 is also the second cavity 1142.

[0149] The box body 1110 also includes a second structural reinforcement body 1143, which can adopt a plate-like structure. The second structural reinforcement body 1143 is connected to the beam wall of the second structural beam 1140 and the wall of the second tenon joint 1141 to increase the rigidity and strength of the second structural beam 1140 and the second tenon joint 1141. The second structural reinforcement body 1143 is located in the mold cavity of the second structural beam 1140 and the second tenon joint 1141, and the second structural reinforcement body 1143 is connected to the cavity wall of the second cavity. The second structural reinforcement body 1143 and the cavity wall can be fixed by welding, or the second structural reinforcement body 1143, the second structural beam 1140 and the second tenon joint 1141 are integrally prepared and formed, and the second structural reinforcement body 1143 can be flush with the end face of the plug-in end of the second tenon joint 1141.

[0150] Since the second structural beam 1140 and the second mortise and tenon joint 1141 are both hollow structures, in order to enhance the rigidity, strength and deformation resistance of the second structural beam 1140 and the second mortise and tenon joint 1141, a second structural reinforcement 1143 is added in the second cavity 1142. The second structural reinforcement 1143 plays a supporting role in the second cavity 1142, thereby enhancing the deformation resistance of both.

[0151] In this embodiment, the second structural beam 1140 and the second tenon joint 1141 adopt a hollow structure, which is beneficial to reducing weight and achieving lightweight battery device 1100. Adding a second structural rib 1143 in the cavity is beneficial to enhancing the deformation resistance of the second structural beam 1140 and the second tenon joint 1141.

[0152] In some embodiments, for the first structural beam 1130, the function of the first cavity 1132 is that the first structural beam 1130 deforms when subjected to the extrusion force so as to absorb and disperse the stress, and absorb the expansion deformation of the battery cell assembly 1120. It can be seen that the first structural beam 1130 is an expansion beam. The second structural beam 1140 can also withstand the extrusion force of the battery cell assembly 1120. When the extrusion force is perpendicular to the first structural beam 1130 and the second structural beam 1140 is perpendicular to the first structural beam 1130, the extrusion force is parallel to the second structural beam 1140, and the second structural beam 1140 may not withstand the extrusion force. The first structural beam 1130 can be made of metal material or composite material. The composite material may include fiber material, resin material, etc. The resin material matrix is ​​responsible for transmitting stress and providing environmental adaptability and durability; the fiber material can be made of unidirectional continuous fiber, and the resin material can be made of polyurethane, epoxy, vinyl, etc. The fiber material is mainly responsible for increasing the strength and rigidity of the material, and can also withstand a certain load. In addition, the composite material may also include fillers, such as glass powder, talcum powder, carbon black, etc., which can improve the performance of the composite material, such as reducing costs, improving wear resistance or improving electromagnetic properties, etc. The composite material may also include functional additives, such as curing agents, catalysts, flame retardants, ultraviolet stabilizers, etc., and chemical substances used to improve material properties, etc. The second structural beam 1140 may also be prepared using the above materials.

[0153] In some specific embodiments, reference Figure 1-14As shown, the battery device 1100 includes a battery cell assembly 1120, a box body 1110 and a first structural beam 1130, wherein the box body 1110 has an accommodating space 1113 for accommodating the battery cell assembly 1120, the box body 1110 includes a surrounding box frame portion 1114, and a box wall surface 11141 of the box frame portion 1114 facing the accommodating space 1113 has two first mortise grooves 11145 arranged opposite to each other; the first structural beam 1130 has two first mortise portions 1131, and the two first mortise portions 1131 are respectively formed at two ends of the first structural beam 1130 along the length direction, and the first structural beam 1130 is located in the accommodating space 1113, and the two first mortise portions 1131 correspond to the two opposite first mortises 11145 respectively. The battery device 1100 further comprises a second structural beam 1140 accommodated in the accommodation space 1113, the second structural beam 1140 having two second tenon joints 1141, the two second tenon joints 1141 being respectively formed at both ends of the second structural beam 1140 along the length direction; the box frame portion 1114 has two second tenon joints 11147 arranged opposite to each other on the box wall surface 11141 facing the accommodation space 1113, the two second tenon joints 1141 being respectively corresponding to the two opposite second tenon joints 11147 and being plugged and matched; the second structural beam 1140 and the first structural beam 1130 are arranged in a cross-engagement manner; the box body 1110 further comprises a box bottom 1117 for supporting the battery monomer assembly 1120, The box bottom 1117 is connected to the box frame 1114, and a first bite groove 1136 is provided on a side of the first structural beam 1130 away from the box bottom 1117. Corresponding to the first bite groove 1136, a second bite groove 1144 is provided on a side of the second structural beam 1140 close to the box bottom 1117. The first structural beam 1130 and the second structural beam 1140 are intersectingly engaged at the positions of the first bite groove 1136 and the second bite groove 1144; the box frame 1114 includes a box wall 11142, the box wall 11142 is a hollow structure, and a first cavity 11143 is formed inside the box wall 11142, and a first mortise and tenon groove 11145 is provided on the box wall 11142 and passes through the first cavity 11143; the box 1110 also includes The first support rib 1115 is provided in the first cavity 11143 and connected to the cavity wall of the first cavity 11143, and the first support rib 1115 is in contact with the first tenon joint 1131; the first structural beam 1130 and the first tenon joint 1131 are both hollow structures, a first cavity 1132 is formed inside the first structural beam 1130 and passes through the first tenon joint 1131, a first structural rib 1135 is provided in the first cavity 1132, and the first structural rib 1135 is connected to the cavity wall of the first cavity 1132; a second cavity 11144 is formed inside the box wall 11142, and a second mortise groove 11147 is provided on the box wall 11142 and passes through the second cavity 11144;The box body 1110 further includes a second support rib 1116, which is disposed in the second cavity 11144 and connected to the cavity wall of the second cavity 11144, and the second support rib 1116 abuts against the second tenon joint 1141; the second structural beam 1140 and the second tenon joint 1141 are both hollow structures, a second cavity 1142 is formed inside the second structural beam 1140 and penetrates into the second tenon joint 1141, a second structural rib 1143 is disposed in the second cavity 1142, and the second structural rib 1143 is connected to the cavity wall of the second cavity 1142. ;

[0154] According to some embodiments of the present application, the present application further provides an energy storage device, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0155] Specifically, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices 1100, and the multiple battery devices 1100 are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0156] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0157] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0158] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are housed in the cabinet.

[0159] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0160] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device 1100 through a pipeline.

[0161] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (SBMU), a fusion switch and other modules.

[0162] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current and voltage of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0163] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system. As an example, the power distribution module can be used to distribute power to modules in the energy storage device that require power.

[0164] According to some embodiments of the present application, the present application also provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0165] In some embodiments, the energy storage system may include one or more energy storage devices and a power converter system (PCS), and the power converter is used to connect between the power generation equipment and the energy storage device. The power generation equipment is used to generate electrical energy, and the electrical energy generated by the power generation equipment can be stored in the energy storage device through the power conversion device. As an example, the power generation equipment may specifically be a solar panel, a hydropower generation equipment, a thermal power generation equipment, a wind power generation equipment, etc. Among them, the specific type of the power generation equipment is not limited in this application.

[0166] According to some embodiments of the present application, referring to Figure 1 As shown, the present application further provides an electrical device, which includes the battery device 1100 in the above embodiment, the energy storage device in the above embodiment, or the energy storage system in the above embodiment, and the battery device 1100 is used to store or provide electrical energy.

[0167] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0168] The example of the electrical device in the present application is based on the example of the battery device 1100 described above. The example of the electrical device includes all the technical effects of the example of the battery device 1100 described above, which will not be described in detail.

[0169] According to some embodiments of the present application, the present application further provides a charging network, which includes charging piles and the energy storage device in the above embodiment or the energy storage system in the above embodiment, and the energy storage device is used to provide electrical energy for the charging piles.

[0170] For example, the charging network includes a charging pile and an energy storage device, the charging pile is electrically connected to the energy storage device, and the energy storage device is used to provide electrical energy to the charging pile. The charging pile is electrically connected to the battery device 1100 in the energy storage device through a cable, and the battery device 1100 can provide its stored electrical energy to the charging pile. The charging pile has one or more connectors, which are used to connect to an electrical device (such as a vehicle 1000) so that energy can be replenished to the electrical device.

[0171] The energy storage device can be located inside the charging pile (such as an integrated storage and charging machine) or outside the charging pile.

[0172] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A battery device (1100), characterized in that: include: Battery cell assembly (1120); A box body (1110) having an accommodation space (1113) for accommodating a battery cell assembly (1120), the box body (1110) comprising a surrounding box frame portion (1114), the box frame portion (1114) having two first mortise and tenon grooves (11145) arranged opposite to each other on a box wall surface (11141) facing the accommodation space (1113); The first structural beam (1130) has two first tenon joints (1131), the two first tenon joints (1131) are respectively formed at two ends of the first structural beam (1130) along the length direction, the first structural beam (1130) is located in the accommodating space (1113), and the two first tenon joints (1131) are respectively plugged and matched with two opposite first mortise grooves (11145); The second structural beam (1140) is accommodated in the accommodating space (1113), and the second structural beam (1140) has two second mortise and tenon joints (1141), and the two second mortise and tenon joints (1141) are respectively formed at the two ends of the second structural beam (1140) along the length direction; the box wall surface (11141) of the box frame part (1114) facing the accommodating space (1113) has two second mortise and tenon grooves (11147) arranged opposite to each other, and the two second mortise and tenon joints (1141) are respectively plugged and matched with the two opposite second mortise and tenon grooves (11147); the second structural beam (1140) and the first structural beam (1130) are cross-engaged.

2. The battery device (1100) according to claim 1, characterized in that: The box body (1110) further comprises a box bottom (1117) for supporting the battery cell assembly (1120); the box bottom (1117) is connected to the box frame (1114); a first bite groove (1136) is provided on a side of the first structural beam (1130) away from the box bottom (1117); corresponding to the first bite groove (1136), a second bite groove (1144) is provided on a side of the second structural beam (1140) close to the box bottom (1117); the first structural beam (1130) and the second structural beam (1140) are cross-engaged at the positions of the first bite groove (1136) and the second bite groove (1144).

3. The battery device (1100) according to claim 2, characterized in that: The box frame portion (1114) has two box wall surfaces (11141) respectively opposite to the two ends of the second structural beam (1140) provided with protruding structural members (11150), and two second mortise and tenon joints (11147) are respectively opened on the two structural members (11150) and extend into the box wall surfaces (11141), and at least one of the second mortise and tenon joints (11147) passes through to the top surface of the structural member (11150) along the height direction.

4. The battery device (1100) according to claim 1, characterized in that: The first tenon joint (1131) and the box frame portion (1114) are welded; and / or The second mortise and tenon joint (1141) and the box frame portion (1114) are welded.

5. The battery device (1100) according to any one of claims 1 to 4, characterized in that: The box frame portion (1114) includes a box wall body (11142), the box wall body (11142) is a hollow structure, a first cavity (11143) is formed inside the box wall body (11142), and the first mortise and tenon groove (11145) is opened on the box wall body (11142) and passes through the first cavity (11143); the box body (1110) also includes a first supporting rib (1115), the first supporting rib (1115) is arranged in the first cavity (11143) and connected to the cavity wall of the first cavity (11143), and the first supporting rib (1115) is in contact with the first mortise and tenon portion (1131).

6. The battery device (1100) according to claim 5, characterized in that: The box wall body (11142) includes a first box wall (11148) and a second box wall (11149) that are arranged opposite to each other, the first box wall (11148) is arranged toward the accommodating space (1113), and the notch of the first mortise and tenon groove (11145) is opened on the first box wall (11148); the first supporting rib body (1115) includes a first supporting plate (11151) accommodated in the first cavity (11143), and the first supporting plate (11151) is connected between the first box wall (11148) and the second box wall (11149).

7. The battery device (1100) according to claim 6, characterized in that: The first supporting rib (1115) further comprises a second supporting plate (11152) accommodated in the first cavity (11143) and connected to the box wall (11142); the second supporting plate (11152) is connected to the cavity wall of the first cavity (11143) and cross-connected to the first supporting plate (11151).

8. The battery device (1100) according to any one of claims 1 to 4, characterized in that: The first structural beam (1130) comprises a first beam body (1133) and a second beam body (1134) extending in the same direction; the first beam body (1133) and the second beam body (1134) are arranged side by side and connected in the height direction; the two extending ends of the first beam body (1133) are respectively connected to the first mortise and tenon joints (1131); and the two extending ends of the second beam body (1134) are both in contact with the box wall surface (11141).

9. The battery device (1100) according to claim 8, characterized in that: The first mortise and tenon portions (1131) protrude along the width direction of the first structural beam (1130) to form first step portions (11311), and second step portions (11146) are respectively formed on two opposite groove walls of the first mortise and tenon groove (11145) corresponding to the two first step portions (11311), and the first step portions (11311) are matched and plugged with the second step portions (11146).

10. The battery device (1100) according to claim 9, characterized in that: The first step portion (11311) extends from the first tenon joint (1131) to the first beam body (1133).

11. The battery device (1100) according to claim 8, characterized in that The first beam body (1133) and the second beam body (1134) are detachably connected; or The first beam body (1133) and the second beam body (1134) are welded; or The first beam body (1133) and the second beam body (1134) are integrally formed.

12. The battery device (1100) according to any one of claims 1 to 4, characterized in that: The first structural beam (1130) and the first mortise and tenon joint (1131) are both hollow structures. A first cavity (1132) is formed inside the first structural beam (1130) and passes through the first mortise and tenon joint (1131). A first structural rib (1135) is arranged in the first cavity (1132). The first structural rib (1135) is connected to the cavity wall of the first cavity (1132).

13. The battery device (1100) according to any one of claims 1 to 4, characterized in that: The box frame portion (1114) includes a box wall body (11142), the box wall body (11142) is a hollow structure, a second cavity (11144) is formed inside the box wall body (11142), and the second mortise and tenon groove (11147) is opened on the box wall body (11142) and passes through the second cavity (11144); the box body (1110) also includes a second supporting rib (1116), the second supporting rib (1116) is arranged in the second cavity (11144) and connected to the cavity wall of the second cavity (11144), and the second supporting rib (1116) is in contact with the second mortise and tenon portion (1141).

14. The battery device (1100) according to claim 13, characterized in that: The second supporting rib (1116) comprises a third supporting plate (11161) accommodated in the second cavity (11144), and the third supporting plate (11161) is connected to the cavity wall of the second cavity (11144).

15. The battery device (1100) according to claim 14, characterized in that: The second supporting rib (1116) further comprises a fourth supporting plate (11162) accommodated in the second cavity (11144) and connected to the box wall (11142); the fourth supporting plate (11162) is connected to the cavity wall of the second cavity (11144) and cross-connected to the third supporting plate (11161).

16. The battery device (1100) according to any one of claims 1 to 4, characterized in that: The second structural beam (1140) and the second mortise and tenon joint (1141) are both hollow structures. A second cavity (1142) is formed inside the second structural beam (1140) and passes through the second mortise and tenon joint (1141). A second structural rib (1143) is arranged in the second cavity (1142). The second structural rib (1143) is connected to the cavity wall of the second cavity (1142).

17. An energy storage device, characterized in that: Comprising a plurality of battery devices (1100) according to any one of claims 1 to 16, wherein the battery devices (1100) are used to store or provide electrical energy.

18. An energy storage system, characterized in that: It comprises a power conversion device and an energy storage device as claimed in claim 17, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

19. An electrical device, characterized in that: It comprises the battery device (1100) according to any one of claims 1 to 16, the energy storage device according to claim 17, or the energy storage system according to claim 18, wherein the battery device (1100) is used to store or provide electrical energy.

20. A charging network, characterized in that: It comprises a charging pile and the energy storage device according to claim 17 or the energy storage system according to claim 18, wherein the energy storage device is used to provide electrical energy for the charging pile.

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