Battery device and electric equipment

Abstract

The utility model relates to the related technical field of batteries, and discloses a battery device and electric equipment.The battery device comprises a box body, at least two layers of battery monomer assemblies, an expansion beam and a supporting plate, the box body comprises a top wall and a bottom wall which are opposite in the first direction, a containing space is formed in the box body, and the containing space is located between the top wall and the bottom wall; the at least two layers of battery monomer assemblies are arranged in the accommodating space, the at least two layers of battery monomer assemblies are stacked in the first direction, and each layer of battery monomer assembly comprises at least one battery monomer; the expansion beams are arranged in the accommodating space, the expansion beams are arranged at the two ends of the battery monomer assembly on any layer in the second direction, and the first direction intersects with the second direction; according to the battery device, the supporting plates are arranged between the battery monomer assemblies of the two adjacent layers, and the expansion beams corresponding to the battery monomer assemblies of the two adjacent layers are connected to the corresponding supporting plates, so that the expansion force resistance of the battery device is improved, and the weight and the production cost of the battery device are reduced.

Description

Technical Field

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

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] As the demand for clean energy increases, battery devices have been widely developed. Battery devices can store electrical energy and can be widely used in electronic devices such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools.

[0004] During the charge and discharge process of a battery device, the internal battery cells will expand to a certain extent. Excessive expansion of the battery cells will cause damage to the battery device. How to improve the ability of the battery device to resist the expansion force has always been a problem of continuous concern during the research and development of battery devices. Utility Model Content

[0005] In view of the above problems, the present application provides a battery device and an electrical device to improve the ability of the battery device to resist expansion force.

[0006] The first aspect of the present application proposes a battery device, comprising a box body, at least two layers of battery cell assemblies, an expansion beam and a support plate, the box body comprising a top wall and a bottom wall opposite to each other along a first direction, a accommodating space being arranged in the box body; at least two layers of battery cell assemblies are arranged in the accommodating space, and the at least two layers of battery cell assemblies are stacked along the first direction, and each layer of the battery cell assemblies comprises at least one battery cell; an expansion beam is arranged in the accommodating space, and the expansion beams are arranged at both ends of the battery cell assemblies of any layer along a second direction, and the first direction intersects with the second direction; the support plate is arranged between the battery cell assemblies of two adjacent layers, and the expansion beams corresponding to the battery cell assemblies of two adjacent layers are connected to the corresponding support plate.

[0007] In the technical solution of the embodiment of the present application, a support plate is arranged between two adjacent layers of battery cell assemblies, and the support plate can support the battery cell assemblies on the upper layer. The adjacent layer expansion beams corresponding to the two adjacent layers of battery cell assemblies are connected to the support plate. The expansion beams can be connected and fixed by the support plate. The expansion beams can rely on the rigidity of the support plate to resist the expansion force of the corresponding battery cell assembly along the second direction, thereby improving the ability of the battery device to resist the expansion force; at the same time, the expansion beams at both ends of the adjacent layers of battery cell assemblies are commonly connected to the support plate between the adjacent layers of battery cells. In this way, a connecting belt may not be arranged or may be reduced between the two expansion beams at both ends of the same battery cell assembly along the second direction, thereby reducing the connection structure of the expansion beams, reducing the weight and production cost of the battery device, and improving the energy density of the battery device.

[0008] In addition, the battery device according to the present application may also have the following additional technical features:

[0009] In some embodiments of the present application, the battery cell assembly closest to the top wall is a first battery cell assembly, and the battery cell assembly closest to the bottom wall is a second battery cell assembly. The expansion beam corresponding to the first battery cell assembly is a first expansion beam, and the expansion beam corresponding to the second battery cell assembly is a second expansion beam. The first expansion beam is connected to the top wall, and the second expansion beam is connected to the bottom wall. The first expansion beam is connected to the top wall, so that the first expansion beams located at both ends of the first battery cell assembly along the second direction can be connected through the top wall. The top wall can provide a binding effect between the two first expansion beams at both ends, limiting the movement of the first expansion beam along the second direction, so that the rigidity of the top wall can be used to resist the expansion force of the first battery cell assembly along the second direction, thereby improving the ability of the battery device to resist the expansion force. At the same time, the first expansion beam is connected to the top wall, which can increase the main frequency of the battery device (the main frequency of an object usually refers to the natural frequency of the object when it vibrates or oscillates, that is, the frequency corresponding to the lowest energy and most stable state when the object vibrates), thereby improving the support strength of the battery device. The second expansion beam is connected to the bottom wall, so that the second expansion beams at both ends of the second battery cell assembly along the second direction can be connected through the bottom wall, and the bottom wall can provide a binding effect between the two second expansion beams at both ends, limiting the movement of the second expansion beam along the second direction, so that the rigidity of the bottom wall can be used to resist the expansion force of the second battery cell assembly along the second direction, thereby improving the ability of the battery device to resist the expansion force. At the same time, the second expansion beam is connected to the bottom wall together, which can increase the main frequency of the battery device (the main frequency of an object usually refers to the natural frequency of the object when it vibrates or oscillates, that is, the frequency corresponding to the lowest energy and most stable state of the object when it vibrates), thereby improving the support strength of the battery device.

[0010] In some embodiments of the present application, the first expansion beam is detachably connected to the top wall. When the battery device needs maintenance or repair, the top wall can be separated from the first expansion beam, which improves the convenience of maintenance and repair of the battery device.

[0011] In some embodiments of the present application, the first expansion beam and the top wall are configured to be detachably connected via a first fastener. In the battery device of this embodiment, the first expansion beam and the top wall are connected via a first fastener, which has high assembly flexibility and is easy to operate.

[0012] In some embodiments of the present application, the second expansion beam and the bottom wall are configured as an integral structure, or the second expansion beam and the bottom wall are configured to be connected via a second fastener. The second expansion beam and the bottom wall are configured as an integral structure, which can improve the connection strength of the second expansion beam and improve the ability of the second expansion beam to resist the expansion force. The second expansion beam is connected to the bottom wall via a second fastener, so that when the box is assembled, the box and the expansion beam can be placed in place first, and then the second fastener can be used from the outside of the box to pass through the bottom wall and connect to the expansion beam, which makes assembly more convenient.

[0013] In some embodiments of the present application, the support plate is detachably connected to the expansion beams at both ends of at least one of the adjacent layers of the battery cell assemblies. The support plate is detachably connected to at least one of the layers of expansion beams. When assembling the battery cell assemblies, the support plate can be assembled with the corresponding battery cell assemblies first, and then the support plate can be assembled with the expansion beams, which improves the convenience of assembling the battery cell assemblies and the assembly efficiency of the battery device.

[0014] In some embodiments of the present application, the support plate is detachably connected to at least the expansion beams at both ends of the battery cell assembly of the adjacent lower layer. The support plate is detachably connected to the expansion beams at both ends of the corresponding lower layer. In this way, when the battery device needs maintenance or repair, the support plate, the expansion beam connected to the upper layer of the support plate, and the battery cell assembly located on the support plate can be disassembled together, and the battery cell assembly of the lower layer can be maintained and repaired, which is convenient to operate. At the same time, the support plate is assembled and fixed with the two expansion beams of the upper layer, which can better support and fix the battery cell assembly of the upper layer. During the assembly process of the battery device, the support plate can be assembled and fixed with the two expansion beams of the upper layer first, and then the battery cell assembly can be placed on the support plate and located between the two expansion beams to carry and assemble the battery cell assembly, which improves the convenience of assembly.

[0015] In some embodiments of the present application, the support plate is detachably connected to the expansion beams at both ends of the battery cell assembly of the adjacent lower layer, and the support plate is connected to the expansion beams at both ends of the battery cell assembly of the adjacent upper layer as a whole. The support plate is connected to the two expansion beams of the corresponding upper layer as a whole, and the structural strength is high. In the process of assembling the battery device, the battery cell assembly can be placed on the support plate and located between the two expansion beams to carry and assemble the battery cell assembly, thereby improving the convenience of assembly.

[0016] In some embodiments of the present application, in two adjacent layers of expansion beams, along the second direction, two adjacent expansion beams located at the same end of the battery cell assembly are connected to each other. In this embodiment, by connecting adjacent expansion beams at corresponding ends, the expansion beams of two adjacent layers can be bound to each other, thereby improving the ability of the expansion beams to resist the expansion force of the battery cell assembly.

[0017] In some embodiments of the present application, in two adjacent layers of battery cell assemblies, the support plate is connected to the expansion beam corresponding to one layer of the battery cell assemblies, and the support plate is connected to the expansion beam corresponding to another layer of the battery cell assemblies through the expansion beam corresponding to the battery cell assemblies of the layer. In this embodiment, the expansion beams of one layer are connected and fixed to the corresponding support plate through the expansion beams of another layer. The support plate only needs to be connected to the expansion beams of one layer. The structural layout is simple and flexible, and the assembly operation is convenient. It can reduce the space occupied by components and reduce the possibility of interference between components.

[0018] In some embodiments of the present application, in the expansion beams of two adjacent layers, one of the expansion beams is provided with a first plug-in structure, and the other of the expansion beams is provided with a second plug-in structure, and the first plug-in structure and the second plug-in structure are plugged in cooperation. The expansion beams at the corresponding ends of the two adjacent layers are connected by the first plug-in structure and the second plug-in structure, and the first plug-in structure and the second plug-in structure can also be mutually positioned and assembled, so the connection operation is relatively convenient.

[0019] In some embodiments of the present application, the expansion beams of two adjacent layers are fastened and connected by a third fastener. The expansion beams at corresponding ends of two adjacent layers are connected by the third fastener, which has high connection reliability and improves the connection strength between the expansion beams.

[0020] In some embodiments of the present application, the expansion beams of two adjacent layers are provided with protruding structures on the sides close to each other, and the protruding structures are arranged to protrude away from the battery cell assembly, and the third fasteners fasten and connect the corresponding protruding structures of the expansion beams of two adjacent layers. The expansion beams are provided with protruding structures, which facilitates the assembly or disassembly of the third fasteners.

[0021] A second aspect of the present application provides an electrical device, comprising a battery device provided in the present application or any embodiment of the present application, wherein the battery device is used to store or provide electrical energy.

[0022] The electrical equipment provided in the present application has the beneficial effects of the battery device proposed in the present application or any embodiment of the present application.

[0023] 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

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0026] Figure 2 A schematic diagram of a battery device according to some embodiments of the present application;

[0027] Figure 3 A schematic diagram of a battery cell proposed in some embodiments of the present application;

[0028] Figure 4 A schematic cross-sectional view of a battery device according to some embodiments of the present application;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of part A;

[0030] Figure 6 for Figure 4 An enlarged schematic diagram of part B.

[0031] The reference numerals in the specific implementation manner are as follows:

[0032] 1000. Vehicles;

[0033] 100, battery device; 200, controller; 300, motor;

[0034] 110, box body; 111, first box body; 112, second box body; 113, top wall; 114, bottom wall;

[0035] 120, battery cell assembly; 121, battery cell; 1211, shell; 1212, shell; 1213, end cover; 1214, electrode assembly; 1215, pole ear; 1216, electrode terminal; 122, first battery cell assembly; 123, second battery cell assembly; 124, first fastener; 1241, screwing portion; 1242, screw rod; 1443, first connecting hole; 1444, second connecting hole; 125, first plug-in structure; 1251, positioning column; 126, second plug-in structure; 1261, positioning hole; 127, third fastener; 128, protruding structure; 1281, bolt hole; 129, second fastener; 1291, rivet nut;

[0036] 130, expansion beam; 131, first expansion beam; 132, second expansion beam;

[0037] 140. Support plate;

[0038] X, second direction; Y, third direction; Z, first direction. DETAILED DESCRIPTION

[0039] 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 used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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).

[0045] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the 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.

[0046] 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.

[0047] Battery devices can store electrical energy and supply power to electrical equipment. With the development of new energy, the use of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0048] The battery device may include a housing and a battery cell assembly, wherein the housing is used to accommodate the battery cell assembly. During the use of the battery device, the battery cell assembly may expand due to charging and discharging or other factors. The expansion of the battery cell assembly may cause the housing to deform, affecting the structural strength and reliability of the housing. The deformation of the housing may also affect the normal use of the battery device, thereby affecting the performance of the battery device.

[0049] An expansion beam may be provided in the box to alleviate the problem of deformation of the box caused by the battery cell assembly. The expansion beam is provided inside the box and is used to abut against the battery cell assembly to resist the expansion force of the battery cell assembly.

[0050] In some technologies, the box of the battery device can accommodate two layers of battery cell assemblies, and expansion beams are respectively provided at both ends of the two layers of battery cell assemblies corresponding to the direction of the largest expansion force. The expansion beams at both ends of the upper layer of battery cell assemblies are connected by connecting belts to resist the expansion force of the upper layer of battery cell assemblies, and the expansion beams at both ends of the lower layer of battery cell assemblies are connected by connecting belts to resist the expansion force of the lower layer of battery cell assemblies. The connecting belt can be a steel belt, and the connecting belt corresponding to the upper layer of battery cell assemblies and the connecting belt corresponding to the lower layer of battery cell assemblies are usually relatively independently arranged. This battery device has a poor effect in resisting expansion force, and the connecting belt will occupy the space of the battery device, reduce the energy density of the battery, and increase the cost of the battery device.

[0051] Based on this, in order to improve the ability of a battery device with multiple layers of battery cell assemblies to resist expansion force, increase battery density, and reduce the cost of the battery device, the present application provides a battery device, wherein a support plate is arranged between two adjacent layers of battery cell assemblies, and the expansion beams corresponding to the two adjacent layers of battery cell assemblies are both connected to the corresponding support plates.

[0052] In the battery device of the present application, the support plate between two adjacent layers of battery cell assemblies can support the battery cell assemblies on the upper layer. The expansion beams of the adjacent layers corresponding to the battery cell assemblies of the two adjacent layers are connected to the support plate. The expansion beams can be connected and fixed by the support plate. The expansion beams can rely on the rigidity of the support plate to resist the expansion force of the corresponding battery cell assemblies, thereby improving the ability of the battery device to resist the expansion force. At the same time, the expansion beams at both ends of the adjacent layers of battery cell assemblies are commonly connected to the support plate between the adjacent layers of battery cells. The connection belt between the two expansion beams at both ends of the same battery cell assembly may not be set or may be reduced, thereby reducing the structure of the connection belt of the expansion beam, reducing the weight and production cost of the battery device, and improving the energy density of the battery device.

[0053] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0055] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0056] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0057] It is understandable that the battery device 100 can not only serve as an operating power source for the vehicle 1000 , but also serve as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0058] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0059] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0060] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0061] like Figure 2 As shown, Figure 2 This is a schematic diagram of a battery device proposed in some embodiments of the present application. In some embodiments, the battery device 100 may be a battery pack, which includes a case and one or more battery cell assemblies 120 , and the battery cell assemblies 120 are accommodated in the case 110 .

[0062] As an example, the battery cell assembly 120 may be accommodated in the case 110 by fixing the battery module in the case 110 .

[0063] As an example, the battery cell assembly 120 may also be accommodated in the case 110 by directly fixing the plurality of battery cells 121 to the case 110 .

[0064] As an example, Figure 2 As shown, the box 110 may include a first box 111 and a second box 112. The first box 111 and the second box 112 are buckled together to form a closed space inside the box 110 to accommodate the battery cell assembly 120. The closed space here means covered or closed, which may be sealed or unsealed. The first box 111 may be a top cover or a bottom plate.

[0065] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly 120.

[0066] In some embodiments, the box 110 may be a part of the chassis structure of the vehicle 1000. For example, a portion of the box 110 may become at least a portion of the floor of the vehicle 1000, or a portion of the box 110 may become at least a portion of the cross beam and longitudinal beam of the vehicle 1000.

[0067] In some embodiments, the battery device 100 refers to an energy storage device, which includes a cabinet, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0068] like Figure 3 As shown, Figure 3 This is a schematic diagram of a battery cell proposed in some embodiments of the present application. In the embodiments of the present application, the battery cell 121 may be a secondary battery, which refers to a battery cell 121 that can be continuously used by activating active materials by charging after the battery cell 121 is discharged.

[0069] The battery cell 121 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0070] The battery cell 121 generally includes a housing 1211, an electrode assembly 1214 and an electrode terminal 1216, wherein the electrode terminal 1216 is disposed on the housing 1211, the electrode assembly 1214 is disposed in the housing 1211, and the electrode terminal 1216 is electrically connected to the pole ear 1215 of the electrode assembly 1214. The electrode assembly 1214 includes a positive electrode, a negative electrode and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 121, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0071] Exemplarily, the outer shell 1211 of the battery cell 121 includes a shell 1212 and an end cover 1213, the shell is provided with an opening, the end cover 1213 is covered on the shell 1212, the end cover 1213 and the shell 1212 cooperate to form an accommodating space, the electrode assembly 1214 is arranged in the accommodating space, and the electrode terminal 1216 is arranged on the end cover 1213.

[0072] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells or battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0073] Reference Figure 2 , and combined with Figures 4 to 6 As shown, Figure 4 is a cross-sectional schematic diagram of a battery device proposed in some embodiments of the present application, Figure 5 for Figure 4 A magnified schematic diagram of part A, Figure 6 for Figure 4 , the present application provides a battery device 100, including a box body 110, at least two layers of battery cell assemblies 120, an expansion beam 130 and a support plate 140, the box body 110 includes a top wall 113 and a bottom wall 114 opposite to each other along a first direction Z, and a accommodating space is arranged in the box body 110; at least two layers of battery cell assemblies 120 are arranged in the accommodating space, and at least two layers of battery cell assemblies 120 are stacked along the first direction Z, and each layer of battery cell assemblies 120 includes at least one battery cell 121; the expansion beam 130 is arranged in the accommodating space, and expansion beams 130 are arranged at both ends of any layer of battery cell assemblies 120 along a second direction X, and the second direction X intersects with the first direction Z; a support plate 140 is arranged between two adjacent layers of battery cell assemblies 120, and the expansion beams 130 corresponding to the battery cell assemblies 120 of the two adjacent layers are connected to the corresponding support plate 140.

[0074] The top wall 113 and the bottom wall 114 of the box body 110 can be understood as two walls of the box body 110 that are opposite to each other and spaced apart. Specifically, the top wall 113 and the bottom wall 114 of the box body 110 can be understood as two walls of the box body 110 that are opposite to each other along the stacking direction of the multi-layer battery monomer assembly 120. Optionally, the stacking direction of the multi-layer battery monomer assembly 120 can be the height direction of the box body 110, and the direction from the top wall 113 to the bottom wall 114 of the box body 110 is also the height direction of the box body 110. The top wall 113 of the box body 110 is arranged on the top side of the accommodation space, and the bottom wall 114 of the box body 110 is arranged on the bottom side of the accommodation space. It should be noted that when the battery device 100 is in different placement states, the top wall 113 and the bottom wall 114 may also be on the side of the current placement state of the box body 110.

[0075] For example, Figure 2 As shown, the box body 110 includes a first box body 111 and a second box body 112. The first box body 111 and the second box body 112 are buckled together to form a closed accommodating space inside the box body 110 to accommodate the battery cell assembly 120. The top wall 113 can be the wall of the first box body 111, and the bottom wall 114 can be the wall of the second box body 112.

[0076] Exemplarily, the box body 110 includes a top cover, a frame and a bottom plate, and the top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body 110 to accommodate the battery cell assembly 120. The top cover can be set as a top wall 113 and the bottom plate can be set as a bottom wall 114.

[0077] The battery cell assembly 120 can be arranged in two layers, three layers or more layers. The multi-layer battery cell assembly 120 is arranged in the accommodating space of the box body 110 and is stacked in sequence. Each battery cell assembly 120 may include a plurality of battery cells 121, and the plurality of battery cells 121 may be arranged in a row along the second direction X, or in multiple rows along the third direction Y, and the plurality of battery cells 121 in each row may be arranged along the second direction X. The second direction X and the third direction Y intersect with the stacking direction of the multi-layer battery cell assembly 120, respectively, and the second direction X intersects with the third direction Y. Exemplarily, the second direction X may be the length direction of the battery box body 110, and the third direction Y may be the width direction of the battery box body 110.

[0078] The expansion beam 130 is disposed in the accommodation space, and may be a strip-shaped block or plate-shaped structure. The expansion beam 130 may be processed by a variety of processes, and may specifically be an expansion beam of a profile, a rolled expansion beam, a sheet metal expansion beam, a die-cast expansion beam, etc. During the charging and discharging process of the battery cell 121, the expansion beam 130 is used to abut against the battery cell assembly 120 to provide support for the battery cell assembly 120, resist the expansion force of the battery cell assembly 120, and reduce the possibility of failure of the battery device 100.

[0079] Expansion beams 130 are provided at both ends of the battery cell assembly 120 along the second direction X. The second direction X may be the direction in which the expansion force of the battery cell assembly 120 is the largest. In a square battery cell 121, the second direction X may be the direction in which the large surface of the battery cell 121 faces, that is, the arrangement direction of the two large surfaces of the battery cell 121.

[0080] Each expansion beam 130 may extend substantially along the third direction Y. The expansion beams 130 located at both ends of the multi-layer battery cell assembly 120 (both ends along the second direction X) are respectively arranged in a stacked arrangement, that is, a plurality of expansion beams 130 at the same end are stacked along the first direction Z, and the layers of the battery cell assembly 120 and the layers of the expansion beams 130 may be arranged in a one-to-one correspondence.

[0081] For example, Figure 2 As shown, the dimension of the expansion beam 130 along the third direction Y is not less than the dimension of the battery cell assembly 120 along the third direction Y. Along the third direction Y, the battery cell assembly 120 is located within the dimension range of the expansion beam 130 .

[0082] Exemplarily, the two ends of the expansion beam 130 along the third direction Y can be connected to the side walls of the box body 110 at the corresponding ends to improve the connection stability of the expansion beam 130. At the same time, the connection between the expansion beam 130 and the side walls of the box body 110 can improve the stiffness of the expansion beam 130 and improve the ability of the expansion beam 130 to resist the expansion force of the battery cell assembly 120.

[0083] Exemplarily, along the first direction Z, the height of each layer of battery cell assemblies 120 does not exceed the size range of the expansion beam 130, that is, the top surface of each layer of battery cell assemblies 120 is flush with or lower than the top surface of the corresponding expansion beam 130, and the bottom surface of each layer of battery cell assemblies 120 is flush with or lower than the bottom surface of the corresponding expansion beam 130.

[0084] The expansion beams 130 corresponding to the battery cell assembly 120 can be understood as the expansion beams 130 located at both ends of the battery cell assembly 120 . Accordingly, the battery cell assembly 120 corresponding to the expansion beams 130 can also be understood with reference to the above relationship.

[0085] The support plate 140 is disposed in the accommodation space of the box body 110 and between adjacent battery cell assemblies 120 . The support plate 140 is used to support the battery cell assemblies 120 on the upper layer thereof.

[0086] Exemplarily, the support plate 140 is disposed substantially perpendicular to the first direction Z.

[0087] The support plate 140 can be connected to the side wall of the box 110, and divide the box 110 into relatively independent upper and lower battery compartments, and each battery cell assembly 120 can be arranged in each battery compartment. Exemplarily, the two ends of the support plate 140 along the third direction Y can be fixedly connected to the side wall of the battery box 110, and the two ends of the support plate 140 along the second direction X are fixedly connected to at least one expansion beam 130 in two adjacent layers, and the support plate 140, the expansion beam 130 and the box 110 cooperate to form a battery compartment.

[0088] The battery cell assemblies 120 of two adjacent layers refer to two battery cell assemblies 120 that are adjacent along the first direction Z (the stacking direction of the battery cell assemblies 120). The support plates 140 corresponding to the battery cell assemblies 120 of two adjacent layers can be understood as the support plates 140 located between the battery cell assemblies 120 of the adjacent layers; the battery cell assemblies 120 corresponding to the support plates 140 are understood with reference to the above relationship.

[0089] The expansion beams 130 corresponding to the battery cell assemblies 120 of two adjacent layers are all connected to the corresponding support plates 140. It can be understood that all the expansion beams 130 at both ends of the battery cell assemblies 120 of two adjacent layers along the second direction X are bounded by the support plates 140 and are restricted from moving along the second direction X. That is, the two expansion beams 130 located on the top side of the support plate 140 and the two expansion beams 130 located on the bottom side of the support plate 140 are bounded by the support plate 140, and the support plate 140 can restrict the movement of the expansion beams 130 along the second direction X. Among them, each expansion beam 130 can be directly connected to the corresponding support plate 140 or indirectly connected, so as to be bound by the support plate 140.

[0090] For ease of description, the two ends of the support plate 140 along the second direction X are defined as the first end and the second end respectively. Unless otherwise specified, the first end of other components is the same end as the first end of the support plate 140, and the second end of other components is the same end as the second end of the support plate 140.

[0091] Exemplarily, the first end of the support plate 140 can be directly connected to both the expansion beam 130 on the top side of the first end and the expansion beam 130 on the bottom side of the first end, and the second end of the support plate 140 can be directly connected to both the expansion beam 130 on the top side of the second end and the expansion beam 130 on the bottom side of the second end. Optionally, in this manner, the expansion beams 130 of two adjacent layers can also be fixedly connected.

[0092] Exemplarily, the first end of the support plate 140 can be directly connected to the expansion beam 130 on the top side of the first end, the expansion beam 130 on the bottom side of the first end is connected to the expansion beam 130 on the top side of the first end, and the expansion beam 130 on the bottom side of the first end is connected to the support plate 140 through the expansion beam 130 on the top side of the first end so as to be constrained by the support plate 140; the second end of the support plate 140 can be directly connected to the expansion beam 130 on the top side of the second end, the expansion beam 130 on the bottom side of the second end is connected to the expansion beam 130 on the top side of the second end, and the expansion beam 130 on the bottom side of the second end is connected to the support plate 140 through the expansion beam 130 on the top side of the second end so as to be constrained by the support plate 140.

[0093] Exemplarily, the first end of the support plate 140 may also be directly connected to the expansion beam 130 on the bottom side of the first end, the expansion beam 130 on the top side of the first end is connected to the expansion beam 130 on the bottom side of the first end, and the expansion beam 130 on the top side of the first end is connected to the support plate 140 through the expansion beam 130 on the bottom side of the first end so as to be constrained by the support plate 140; the second end of the support plate 140 may also be directly connected to the expansion beam 130 on the bottom side of the second end, the expansion beam 130 on the top side of the second end is connected to the expansion beam 130 on the bottom side of the second end, and the expansion beam 130 on the top side of the second end is connected to the support plate 140 through the expansion beam 130 on the bottom side of the second end so as to be constrained by the support plate 140.

[0094] For example,

[0095] In the battery device 100 of the present embodiment, the expansion beams 130 corresponding to the battery cell assemblies 120 of two adjacent layers are connected by a support member supporting the battery cell assemblies 120. The expansion beams 130 can be connected and fixed by the support plate 140, so that the expansion beams 130 can rely on the rigidity of the support plate 140 to resist the expansion force of the corresponding battery cell assemblies 120 along the second direction X, thereby improving the ability of the battery device 100 to resist the expansion force; at the same time, the expansion beams 130 at both ends of the battery cell assemblies 120 of adjacent layers are commonly connected to the support plate 140 between the battery cells 121 of adjacent layers, and the connection belt may not be set or the setting may be reduced between the two expansion beams 130 at both ends of the same battery cell assembly 120 along the second direction X, thereby reducing the connection structure of the expansion beam 130, reducing the weight and production cost of the battery device 100, and improving the energy density of the battery device 100.

[0096] According to some embodiments of the present application, optionally, Figures 4 to 6As shown, the battery cell assembly 120 closest to the top wall 113 is the first battery cell assembly 122, and the battery cell assembly 120 closest to the bottom wall 114 is the second battery cell assembly 123. The expansion beam 130 corresponding to the first battery cell assembly 122 is the first expansion beam 131, and the expansion beam 130 corresponding to the second battery cell assembly 123 is the second expansion beam 132. The first expansion beam 131 is connected to the top wall 113, and the second expansion beam 132 is connected to the bottom wall 114.

[0097] The first battery cell assembly 122 is a layer of battery cell assemblies 120 closest to the top wall 113, and the second battery cell assembly 123 is a layer of battery cell assemblies 120 closest to the bottom wall 114. When there are only two layers of battery cell assemblies 120, the upper layer of the two layers of battery cell assemblies 120 is the first battery cell assembly 122, and the lower layer is the second battery cell assembly 123. When there are three layers or three layers of battery cell assemblies 120, the first battery cell assembly 122 and the second battery cell assembly 123 are the two battery cell assemblies 120 that are farthest apart in the multi-layer battery cell assembly 120.

[0098] The two expansion beams 130 located at both ends of the first battery cell assembly 122 along the second direction X are both first expansion beams 131, and the first expansion beams 131 at both ends can be respectively connected to the top wall 113. The two expansion beams 130 located at both ends of the first battery cell assembly 122 along the second direction X are both second expansion beams 132, and the second expansion beams 132 at both ends can be connected to the bottom wall 114.

[0099] For example, Figure 4 and Figure 5 As shown, the top side of the first expansion beam 131 is connected to the top wall 113 , and the bottom side of the first expansion beam 131 is connected to the corresponding support plate 140 .

[0100] Exemplarily, the first expansion beam 131 and the top wall 113 may be fixedly connected by welding, integral molding, riveting, screwing, clamping, or the like.

[0101] For example, Figure 4 and Figure 6 As shown, the bottom side of the second expansion beam 132 is connected to the bottom wall 114 , and the top side of the second expansion beam 132 is connected to the corresponding support plate 140 .

[0102] Exemplarily, the second expansion beam 132 and the bottom wall 114 may be fixedly connected by welding, integral molding, riveting, screwing, clamping, or the like.

[0103] The first expansion beam 131 is connected to the top wall 113, so that the first expansion beams 131 located at both ends of the first battery cell assembly 122 along the second direction X can be connected through the top wall 113, and the top wall 113 can provide a binding effect between the two first expansion beams 131 at both ends, limiting the movement of the first expansion beam 131 along the second direction X, so that the rigidity of the top wall 113 can be used to resist the expansion force of the first battery cell assembly 122 along the second direction X, thereby improving the ability of the battery device 100 to resist the expansion force. At the same time, the first expansion beam 131 is connected to the top wall 113, which can increase the main frequency of the battery device 100 (the main frequency of an object usually refers to the natural frequency of the object when it vibrates or oscillates, that is, the frequency corresponding to the lowest energy and most stable state when the object vibrates), thereby improving the support strength of the battery device 100.

[0104] The second expansion beam 132 is connected to the bottom wall 114, so that the second expansion beams 132 at both ends of the second battery cell assembly 123 along the second direction X can be connected through the bottom wall 114, and the bottom wall 114 can provide a binding effect between the two second expansion beams 132 at both ends, limiting the movement of the second expansion beam 132 along the second direction X, so that the rigidity of the bottom wall 114 can be used to resist the expansion force of the second battery cell assembly 123 along the second direction X, thereby improving the ability of the battery device 100 to resist the expansion force. At the same time, the second expansion beam 132 is connected to the bottom wall 114, which can increase the main frequency of the battery device 100 (the main frequency of an object usually refers to the natural frequency of the object when it vibrates or oscillates, that is, the frequency corresponding to the lowest energy and most stable state when the object vibrates), thereby improving the support strength of the battery device 100.

[0105] According to some embodiments of the present application, optionally, the first expansion beam 131 is detachably connected to the top wall 113 .

[0106] Exemplarily, the first expansion beam 131 and the top wall 113 may be detachably connected by means of a snap connection, a bolt assembly, a screw, or the like.

[0107] The first expansion beam 131 is detachably connected to the top wall 113 . When the battery device 100 needs maintenance or repair, the top wall 113 can be separated from the first expansion beam 131 , thereby improving the convenience of maintenance and repair of the battery device 100 .

[0108] According to some embodiments of the present application, optionally, the first expansion beam 131 and the top wall 113 are configured to be detachably connected via a first fastener 124 .

[0109] The first fastener 124 may be a screw or bolt assembly.

[0110] Exemplarily, along the third direction Y, a plurality of first fasteners 124 may be arranged at intervals corresponding to each first expansion beam 131 .

[0111] Exemplarily, the first fastener 124 includes a screwing portion 1241 and a screw rod 1242, the screwing portion 1241 is fixedly connected to the screw rod 1242, the top wall 113 is provided with a first connection hole 1443, the first expansion beam 131 is provided with a second connection hole 1444, the screwing portion 1241 is provided on the side of the top wall 113 away from the bottom wall 114 (i.e., on the top surface of the top wall 113, the outside of the top wall 113 facing outward), and the screw rod 1242 passes through the first connection hole 1443 and is threadedly connected to the second connection hole 1444. The side of the top wall 113 away from the bottom wall 114 is also the top surface of the top wall 113, which is the surface of the top wall 113 facing the outside of the box body 110. The screwing portion 1241 is screwed in, driving the screw rod 1242 to be screwed in and threadedly connected to the second connection hole 1444. After the screwing portion 1241 abuts against the top surface of the top wall 113, the top wall 113 can be fixedly connected to the first expansion beam 131 under the abutment of the screwing portion 1241 and the fixing effect of the screw rod 1242 being threadedly connected to the second connection hole 1444; the screwing portion 1241 is screwed back, driving the screw rod 1242 to be screwed back and exit the second connection hole 1444, and at this time, the top wall 113 is disconnected from the expansion beam 130. By screwing the screwing portion 1241 on the outside of the top wall 113, the top wall 113 can be easily disassembled, which is easy to operate.

[0112] For example, the first fastener 124 may be configured as a bolt assembly or a screw.

[0113] In the battery device 100 of this embodiment, the first expansion beam 131 and the top wall 113 are connected by the first fastener 124 . The first fastener 124 has high assembly flexibility and is easy to operate.

[0114] According to some embodiments of the present application, optionally, the second expansion beam 132 and the bottom wall 114 are configured as an integral structure, or the second expansion beam 132 and the bottom wall 114 are configured to be connected via a second fastener 129 .

[0115] The second expansion beam 132 and the bottom wall 114 may be connected in a detachable manner or in a non-detachable manner.

[0116] Exemplarily, the second expansion beam 132 and the bottom wall 114 can be an integrally formed structure or a structure welded together. The second expansion beam 132 and the bottom wall 114 are set as one body, which can improve the connection strength of the second expansion beam 132 and improve the ability of the second expansion beam 132 to resist the expansion force. It should be noted that in the integrally formed structure of the second expansion beam 132 and the bottom wall 114, when the box body 110 is assembled, the second expansion beam 132 and the bottom wall 114 can be first formed into one body, and then the other side walls of the box body 110 can be assembled to the bottom wall 114 to improve the assembly convenience of the box body 110.

[0117] Exemplarily, the second expansion beam 132 and the bottom wall 114 may be connected by a second fastener 129. The second fastener 129 may be a screw, a rivet, a bolt assembly, etc. It is understandable that the second expansion beam 132 and the bottom wall 114 are connected by the second fastener 129. In this way, when the box body 110 is assembled, the box body 110 and the expansion beam 130 may be placed in place first, and then the second fastener 129 may be used from the outside of the box body 110 to pass through the bottom wall 114 and connect with the expansion beam 130, so that the assembly is more convenient.

[0118] Exemplarily, the second fastener 129 may be a rivet nut 1291 , that is, the second expansion beam 132 and the bottom wall 114 are riveted and fixed by the rivet nut 1291 .

[0119] For example, the second fastener 129 can be configured as a self-tapping screw, and the self-tapping screw can be assembled from the outer side of the bottom wall 114 to the second expansion beam 132 using the FDS process. The FDS process is called Flow Drill Screw, which is a process technology for connecting metal plates.

[0120] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, the support plate 140 is detachably connected to the expansion beams 130 at both ends of at least one adjacent layer of battery cell assemblies 120 .

[0121] Exemplarily, the support plate 140 can be detachably connected to the expansion beams 130 at both ends of the corresponding upper layer, that is, the support plate 140 can be separated from the two expansion beams 130 of the corresponding upper layer.

[0122] For example, Figure 2 , Figures 4 to 6 As shown, the support plate 140 can be detachably connected to the expansion beams 130 at both ends of the corresponding lower layer, that is, the support plate 140 can be separated from the two expansion beams 130 of the corresponding lower layer.

[0123] The support plate 140 is detachably connected to at least one layer of the expansion beam 130. When assembling the battery cell assembly 120, the support plate 140 can be assembled with the corresponding battery cell assembly 120 first, and then the support plate 140 can be assembled with the expansion beam 130, which improves the assembly convenience of the battery cell assembly 120 and improves the assembly efficiency of the battery device 100.

[0124] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, the support plate 140 is detachably connected to at least the expansion beams 130 at both ends of the battery cell assembly 120 of the adjacent lower layer.

[0125] The support plate 140 is detachably connected to the expansion beams 130 at both ends of the corresponding lower layer. In this way, when the battery device 100 needs maintenance or repair, the support plate 140, the expansion beams 130 of the upper layer connected to the support plate 140, and the battery cell assembly 120 located on the support plate 140 can be disassembled together, and the battery cell assembly 120 of the lower layer can be maintained and repaired, which is convenient to operate. At the same time, the support plate 140 is assembled and fixed with the two expansion beams 130 of the upper layer, which can better support and fix the battery cell assembly 120 of the upper layer. During the assembly process of the battery device 100, the support plate 140 can be assembled and fixed with the two expansion beams 130 of the upper layer first, and then the battery cell assembly 120 can be placed on the support plate 140 and located between the two expansion beams 130, and the battery cell assembly 120 can be carried and assembled, which improves the convenience of assembly.

[0126] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, the support plate 140 is detachably connected to the expansion beams 130 at both ends of the battery cell assembly 120 of the adjacent lower layer, and the support plate 140 is connected to the expansion beams 130 at both ends of the battery cell assembly 120 of the adjacent upper layer as a whole.

[0127] The support plate 140 and the two expansion beams 130 corresponding to the upper layer may be an integrally formed structure, or may be a structure connected into one by welding or the like.

[0128] The support plate 140 is connected to the two expansion beams 130 of the corresponding upper layer as a whole, and the structural strength is relatively high. During the assembly process of the battery device 100, the battery cell assembly 120 can be placed on the support plate 140 and located between the two expansion beams 130 to carry and assemble the battery cell assembly 120, thereby improving the convenience of assembly.

[0129] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, in two adjacent layers of expansion beams 130 , along the second direction X, two adjacent expansion beams 130 located at the same end of the battery cell assembly 120 are connected to each other.

[0130] The two adjacent layers of expansion beams 130 refer to two adjacent layers of expansion beams 130 in the first direction Z.

[0131] Along the second direction X, two adjacent expansion beams 130 located at the same end of the battery cell assembly 120 are connected to each other. It can be understood that the two adjacent expansion beams 130 at the first end are connected to each other, and the two adjacent expansion beams 130 at the second end are connected to each other.

[0132] Exemplarily, two adjacent expansion beams 130 at the first end may be detachably connected.

[0133] Exemplarily, two adjacent expansion beams 130 at the second end may be detachably connected.

[0134] In this embodiment, the expansion beams 130 at the corresponding ends are connected so that the expansion beams 130 of two adjacent layers can be bound to each other, thereby improving the ability of the expansion beams 130 to resist the expansion force of the battery cell assembly 120 .

[0135] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, in two adjacent layers of battery cell assemblies 120 , the support plate 140 is connected to the expansion beams 130 corresponding to one layer of the battery cell assemblies 120 , and the support plate 140 is connected to the expansion beams 130 corresponding to the other layer of the battery cell assemblies 120 through the expansion beams 130 corresponding to the layer of the battery cell assemblies 120 .

[0136] Exemplarily, the support plate 140 is fixedly connected to the two expansion beams 130 on the top side, the expansion beam 130 at the first end of the top side is connected and fixed to the expansion beam 130 at the first end of the bottom side, and the expansion beam 130 at the second end of the top side is connected and fixed to the expansion beam 130 at the second end of the bottom side, so that the two expansion beams 130 on the bottom side are respectively connected to the support plate 140 through the two expansion beams 130 on the top side. Optionally, the two expansion beams 130 at both ends of the top side can be fixedly connected to the ends of the two ends of the support plate 140.

[0137] Exemplarily, the support plate 140 is fixedly connected to the two expansion beams 130 on the bottom side, the expansion beam 130 at the first end of the top side is fixedly connected to the expansion beam 130 at the first end of the bottom side, and the expansion beam 130 at the second end of the top side is fixedly connected to the expansion beam 130 at the second end of the bottom side, so that the two expansion beams 130 on the top side are respectively connected to the support plate 140 through the two expansion beams 130 on the bottom side. Optionally, the two expansion beams 130 at both ends of the bottom side can be fixedly connected to the ends of the two ends of the support plate 140.

[0138] In this embodiment, one layer of expansion beams 130 is connected and fixed to the corresponding support plate 140 through another layer of expansion beams 130. The support plate 140 only needs to be connected to one layer of expansion beams 130. The structural layout is simple and flexible, and the assembly operation is convenient. It can reduce the space occupied by components and reduce the possibility of mutual interference between components.

[0139] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6As shown, in two adjacent layers of expansion beams 130 , one layer of expansion beams 130 is provided with a first plug-in structure 125 , and the other layer of expansion beams 130 is provided with a second plug-in structure 126 , and the first plug-in structure 125 and the second plug-in structure 126 are plugged in cooperation.

[0140] The first plug-in structure 125 and the second plug-in structure 126 may be mutually cooperating positioning columns 1251 and positioning holes 1261 , or may be mutually cooperating snap-fit ​​structures.

[0141] Exemplarily, a positioning column 1251 extending upward is provided at the top end of the lower expansion beam 130, and a positioning hole 1261 is provided at the bottom end of the upper expansion beam 130. The positioning column 1251 is plugged into the positioning hole 1261 to relatively fix the two adjacent expansion beams 130 at the corresponding ends.

[0142] The expansion beams 130 at the corresponding ends of two adjacent layers are connected through the first plug-in structure 125 and the second plug-in structure 126. The first plug-in structure 125 and the second plug-in structure 126 can also be positioned and assembled with each other, so the connection operation is relatively convenient.

[0143] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, two adjacent layers of expansion beams 130 are fastened and connected by a third fastener 127 .

[0144] The third fastener 127 can be a bolt assembly, a screw, a positioning shaft assembly, a rivet, etc.

[0145] The expansion beams 130 at corresponding ends of two adjacent layers are connected by the third fasteners 127 , so the connection reliability is high and the connection strength between the expansion beams 130 is improved.

[0146] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 6 As shown, the two adjacent layers of expansion beams 130 are respectively provided with protruding structures 128 on the sides close to each other. The protruding structures 128 are arranged to protrude away from the battery cell assembly 120 , and the third fasteners 127 fasten the protruding structures 128 corresponding to the two adjacent layers of expansion beams 130 together.

[0147] Specifically, a protruding structure 128 is provided on the lower side of the upper expansion beam 130, and a protruding structure 128 is provided on the upper side of the upper expansion beam 130. The protruding structure 128 at the first end protrudes toward the side of the first end away from the second end, and the protruding structure 128 at the second end protrudes toward the side of the second end away from one end.

[0148] Exemplarily, a bolt hole 1281 is provided on the protruding structure 128 , and the third fastener 127 is a bolt assembly. The third fastener 127 is passed through the bolt hole 1281 to lock and fix two adjacent expansion beams 130 at corresponding ends.

[0149] The expansion beam 130 facilitates the assembly or disassembly of the third fastener 127 by providing the protruding structure 128 .

[0150] like Figures 2 to 5As shown, this embodiment provides a battery device 100, including a box body 110, a first expansion beam 131, a second expansion beam 132, a support plate 140, a first battery cell assembly 122, and a second battery cell assembly 123. The box body 110 includes a first box body 111 and a second box body 112. The first box body 111 and the second box body 112 are buckled to form a receiving space. The first box body 111 is a top cover, which is set as the top wall 113 of the box body 110, and the bottom plate of the second box body 112 is set as the bottom wall 114 of the box body 110. The first battery cell assembly 122 and the second battery cell assembly 123 are provided with a pre-accommodation space. The first battery cell assembly 122 and the second battery cell assembly 123 respectively include a plurality of rows of battery cells 121 arranged along the third direction Y, and each row is provided with a plurality of battery cells 121 along the second direction X. Along the first direction Z, the first battery cell assembly 122 and the second battery cell assembly 123 are stacked. The first expansion beam 131 and the second expansion beam 132 are arranged in the accommodation space, the first expansion beam 131 is respectively arranged at both ends of the first battery cell assembly 122 along the second direction X, and the second expansion beam 132 is respectively arranged at both ends of the second battery cell assembly 123 along the second direction X, the first expansion beam 131 at the first end and the second expansion beam 132 at the first end are stacked, and the first expansion beam 131 at the second end and the second expansion beam 132 at the second end are stacked. The support plate 140 is arranged in the accommodation space and is located between the first battery cell assembly 122 and the second battery cell assembly 123, the second battery cell assembly 123 is supported on the bottom wall 114 of the box body 110, and the first battery cell assembly 122 is supported on the support plate 140. The top side of the first expansion beam 131 at the first end and the top side of the first expansion beam 131 at the second end are respectively locked and fixed with the first box body 111 (i.e., the top wall 113) by bolt assemblies (refer to the first fastener 124), the bottom side of the first expansion beam 131 at the first end is connected as a whole with the first end of the support plate 140, and the bottom side of the first expansion beam 131 at the second end is connected as a whole with the second end of the support plate 140. The bottom side of the second expansion beam 132 at the first end and the bottom side of the second expansion beam 132 at the second end are respectively fixedly connected with the bottom (i.e., the bottom wall 114) of the second box body 112 by rivet nuts 1291. The top side of the second expansion beam 132 at the first end and the top side of the second expansion beam 132 at the second end are respectively provided with positioning columns 1251, and the bottom side of the first expansion beam 131 at the first end and the bottom side of the first expansion beam 131 at the second end are respectively provided with positioning holes 1261, and the positioning columns 1251 at the corresponding ends are plugged into and matched with the positioning holes 1261, so that the expansion beams 130 at both ends of the second battery cell assembly 123 are respectively connected to the support plate 140 through the expansion beams 130 at both ends of the first battery cell assembly 122.At the same time, protruding structures 128 are respectively provided on the top side outer end of the second expansion beam 132 at the first end, the top side outer end of the second expansion beam 132 at the second end, the bottom side outer end of the first expansion beam 131 at the first end and the bottom side outer end of the first expansion beam 131 at the second end, each protruding structure 128 is provided with a bolt hole 1281, and a bolt assembly (refer to the third fastener 127) is provided in the bolt hole 1281 at the corresponding end, and the bolt assembly is locked (refer to the third fastener 127) to fix the first expansion beam 131 and the second expansion beam 132 at the corresponding end.

[0151] This embodiment further provides an electrical device, including the battery device 100 provided in this application or any embodiment of this application, and the battery device 100 can be used to store or provide electrical energy.

[0152] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0153] The electric device of this embodiment has the same beneficial effects as the battery device 100 proposed in this application or any embodiment of this application.

[0154] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, comprising a top wall and a bottom wall opposite to each other along a first direction, wherein a receiving space is provided in the box body, and the receiving space is located between the top wall and the bottom wall; At least two layers of battery monomer assemblies are disposed in the accommodation space, and along the first direction, the at least two layers of battery monomer assemblies are stacked and arranged, and each layer of the battery monomer assembly includes at least one battery monomer; An expansion beam is arranged in the accommodation space, and both ends of the battery monomer assembly of any layer along the second direction are provided with the expansion beam, and the first direction intersects with the second direction; A support plate is provided between the battery monomer assemblies of two adjacent layers, and the expansion beams corresponding to the battery monomer assemblies of two adjacent layers are all connected to the corresponding support plate.

2. The battery device according to claim 1, characterized in that: The battery cell assembly closest to the top wall is the first battery cell assembly, and the battery cell assembly closest to the bottom wall is the second battery cell assembly. The expansion beam corresponding to the first battery cell assembly is the first expansion beam, and the expansion beam corresponding to the second battery cell assembly is the second expansion beam. The first expansion beam is connected to the top wall, and the second expansion beam is connected to the bottom wall.

3. The battery device according to claim 2, characterized in that: The first expansion beam is detachably connected to the top wall.

4. The battery device according to claim 3, characterized in that: The first expansion beam and the top wall are configured to be detachably connected via a first fastener.

5. The battery device according to claim 2, characterized in that: The second expansion beam and the bottom wall are configured as an integral structure, or the second expansion beam and the bottom wall are configured to be connected via a second fastener.

6. The battery device according to any one of claims 1 to 5, characterized in that: The support plate is detachably connected to the expansion beams at both ends of at least one adjacent layer of the battery cell assemblies.

7. The battery device according to claim 6, characterized in that: The support plate is detachably connected to at least the expansion beams at both ends of the battery cell assembly in an adjacent lower layer.

8. The battery device according to any one of claims 1 to 5, characterized in that: The support plate is detachably connected to the expansion beams at both ends of the battery monomer assembly at an adjacent lower layer, and the support plate is integrally connected to the expansion beams at both ends of the battery monomer assembly at an adjacent upper layer.

9. The battery device according to any one of claims 1 to 5, characterized in that: In the expansion beams of two adjacent layers, two adjacent expansion beams located at the same end of the battery cell assembly are connected to each other along the second direction.

10. The battery device according to claim 9, characterized in that: In two adjacent layers of the battery cell assemblies, the support plate is connected to the expansion beams corresponding to one layer of the battery cell assemblies, and the support plate is connected to the expansion beams corresponding to the other layer of the battery cell assemblies through the expansion beams corresponding to the battery cell assemblies in that layer.

11. The battery device according to claim 9, characterized in that: In the expansion beams of two adjacent layers, one layer of the expansion beams is provided with a first plug-in structure, and the other layer of the expansion beams is provided with a second plug-in structure, and the first plug-in structure is plugged in cooperation with the second plug-in structure.

12. The battery device according to claim 9, characterized in that: The expansion beams of two adjacent layers are fastened and connected by a third fastener.

13. The battery device according to claim 12, characterized in that: The expansion beams of two adjacent layers are provided with protruding structures on their respective sides close to each other. The protruding structures are arranged to protrude away from the battery monomer assembly. The third fasteners fasten the two protruding structures together.

14. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 13, wherein the battery device is used to store or provide electrical energy.

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