Battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery device and a power utilization device, the battery device comprises a box body, the main body of the box body is provided with an accommodating space, and at least two limiting beams are arranged in the accommodating space; a battery monomer assembly is arranged between every two adjacent limiting beams; the two ends of the first restraining assembly are connected to the two limiting beams respectively, and the first restraining assembly is arranged on at least one side of the battery monomer assembly in the second direction; the two ends of the second constraint component are respectively connected to the two limiting beams, and the second constraint component is arranged on at least one side of the single battery along the third direction; according to the battery device provided by the embodiment of the invention, the first constraint assembly and the second constraint assembly are arranged, so that the performance of the limiting beam for resisting the expansion deformation of the battery monomers is improved through the first constraint assembly and the second constraint assembly; the first constraining assembly and the second constraining assembly are located on different sides of the battery cell assembly, respectively, to reduce negative effects on the energy density of the battery device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The battery monomer is prone to swelling during the charging and discharging cycle, and the mutual extrusion caused by the swelling of the battery monomer is prone to cause the deformation of the internal structure of the battery monomer and negatively affect the stability of the battery monomer. At present, the constraint of the battery monomer mainly relies on the limiting beam, and with the increase of the use time of the battery device, the swelling force of the battery monomer will increase, and the constraint effect of the limiting beam on the battery monomer will be insufficient. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the application provides a battery device and a power utilization device, which can improve the problem of insufficient constraint performance of the limiting beam on the swelling deformation of the battery device.

[0005] In a first aspect, some embodiments of the application provide a battery device, comprising:

[0006] The box body comprises a box body main body, and the box body main body has a containing space, and at least two limiting beams are arranged in the containing space along a first direction; the battery monomer assembly is contained in the containing space, and the battery monomer assembly is arranged between the adjacent limiting beams, and the two ends of the battery monomer assembly are respectively abutted against the adjacent limiting beams; the first constraint assembly is connected to the two limiting beams at the two ends, and the first constraint assembly is arranged on at least one side of the battery monomer assembly along a second direction; the second constraint assembly is connected to the two limiting beams at the two ends, and the second constraint assembly is arranged on at least one side of the battery monomer along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0007] The technical scheme of the embodiment is characterized in that the first constraint assembly and the second constraint assembly are arranged to improve the performance of the limiting beam in resisting the expansion deformation of the battery monomer, improve the strength of the limiting beam, and improve the constraint performance of the limiting beam; the first constraint assembly and the second constraint assembly are arranged on different sides of the battery monomer assembly respectively, so as to be connected to the limiting beam from different positions and improve the constraint performance of the limiting beam, and the space at different positions in the battery device is utilized, thereby reducing the risk of excessive space occupation of the first constraint assembly and the second constraint assembly when the battery monomer assembly is arranged on one side of the battery monomer, and reducing the negative influence of the first constraint assembly and the second constraint assembly on the energy density of the battery device when the battery monomer assembly is arranged on one side of the battery monomer.

[0008] In some embodiments, the first constraint assembly is arranged to be spaced apart from the battery monomer assembly along a second direction; and / or, the second constraint assembly is arranged to be pressed on the battery monomer assembly along a third direction.

[0009] The technical scheme of the embodiment is characterized in that the first constraint assembly is arranged to be spaced apart from the battery monomer assembly, so as to reduce the risk of collision and damage of the battery monomer by the second constraint assembly.

[0010] In some embodiments, the first constraint assembly comprises a first body, two ends of the first body are connected to the two limiting beams respectively; the first constraint assembly further comprises a first cover arranged on the first body, and the first cover covers at least a portion of a surface of the first body corresponding to the battery monomer assembly.

[0011] The technical scheme of the embodiment provides a specific structure of the first constraint assembly, so that the first cover covers at least the surface of the first body facing the battery monomer assembly, so as to reduce the risk of collision and damage of the battery monomer by the first constraint assembly; at the same time, the risk of damage of the battery monomer by burrs, micro-protruding structures and the like on the first body can also be reduced.

[0012] In some embodiments, the first cover is an elastic structure.

[0013] In the technical scheme of the embodiment, the first cover is an elastic structure, so that in the case that the first constraint assembly collides with the battery monomer assembly, the first cover can absorb the collision energy, thereby better reducing the risk of damage of the battery monomer by the first constraint assembly.

[0014] In some embodiments, the first cover is sleeved on the first body.

[0015] In the technical scheme of the embodiment, the first cover is sleeved on the first main body to better cover the first main body, thereby reducing the risk that the first main body directly contacts the battery monomer and damages the battery monomer; in the case that the first main body is a metal structural member, the arrangement can also reduce the risk that the first main body is short-circuited with the battery monomer.

[0016] In some embodiments, the first constraint assembly further comprises a second cover connected to one side of the first main body facing the battery monomer assembly, the second cover being different in material from the first cover; the first cover is connected to the second cover to be indirectly connected to the first main body.

[0017] In the technical scheme of the embodiment, the second cover is arranged and is different in material from the first cover, so that the first cover and the second cover can respectively play different effects to meet different requirements and better protect the battery monomer.

[0018] In some embodiments, the second cover is sleeved on the first main body, and the second cover is a heat-shrinkable structural member.

[0019] In the technical scheme of the embodiment, the second cover is a heat-shrinkable structural member sleeved on the first main body, so that the second cover can better cover the first main body, thereby better reducing the risk that the first main body directly contacts the battery monomer and damages the battery monomer, and reducing the risk that the first main body is short-circuited with the battery monomer.

[0020] In some embodiments, a threaded structure is arranged on the limiting beam, and the first constraint assembly is connected to the limiting beam through a bolt matched with the threaded structure.

[0021] The technical scheme of the embodiment provides some specific structures of the first constraint assembly connected to the limiting beam, so that the first constraint assembly can be stably connected to the limiting beam.

[0022] In some embodiments, the surface of the bolt is coated with a locking agent; and / or a gasket is arranged between the bolt and the first constraint assembly, and the gasket is connected to the first constraint assembly.

[0023] In the technical scheme of the embodiment, the surface of the bolt is coated with a locking agent and / or a gasket is arranged to reduce the risk that the bolt is withdrawn from the threaded structure during use and improve the stability of the first constraint assembly connected to the limiting beam.

[0024] In some embodiments, the first constraint assembly is connected to one end of the limiting beam in the second direction; an avoiding slot is concavely arranged on one side of the box body facing the limiting beam in the second direction, and the avoiding slot is arranged corresponding to the limiting beam.

[0025] The technical scheme of the embodiment provides a space for the connecting part of the first constraint assembly and the limiting beam on the box body, so that the first constraint assembly is connected to the limiting beam.

[0026] In some embodiments, the battery cell assembly includes a battery cell and a first electrical connection structure connected to the battery cell, the first electrical connection structure being located on one side of the battery cell along the second direction; the first electrical connection structure is spaced apart from the first constraint assembly along the third direction.

[0027] In the technical scheme of the embodiment, the battery cell assembly includes the first electrical connection structure, and the first electrical connection structure is spaced apart from the first constraint assembly, so that the first electrical connection structure avoids the first constraint assembly, thereby reducing the risk of the first constraint assembly colliding with and damaging the first electrical connection structure, and also reducing the risk of short-circuiting between the first constraint assembly and the first electrical connection structure.

[0028] In some embodiments, the battery cell assembly includes a battery cell and a second electrical connection structure connected to the battery cell, the second electrical connection structure being located on one side of the battery cell along the third direction.

[0029] In the technical scheme of the embodiment, the battery cell assembly includes the second electrical connection structure, and the second electrical connection structure and the first constraint assembly are located on different sides of the battery cell assembly, thereby reducing the risk of the first constraint assembly colliding with and damaging the second electrical connection structure, and also reducing the risk of short-circuiting between the first constraint assembly and the second electrical connection structure.

[0030] In some embodiments, the box body includes a frame structure, a bottom plate, and a top cover, the accommodation space extends through the frame structure along the third direction, and the bottom plate and the top cover are respectively connected to two sides of the frame structure along the third direction; the limiting beam and the battery cell assembly are connected to one side of the bottom plate facing the accommodation space along the third direction, and the second constraint assembly is pressed on the side of the battery cell assembly away from the bottom plate.

[0031] The technical scheme of the embodiment provides specific structures of some box bodies, and the battery cell assembly is connected to the bottom plate, and the second constraint assembly is located on one side of the battery cell assembly along the third direction, so that the battery cell assembly is better fixed in the accommodation space by the second constraint assembly and the bottom plate.

[0032] In some embodiments, the limiting beam is connected to the frame structure at both ends along the second direction.

[0033] In the technical scheme of the embodiment, the limiting beam is connected to the frame structure, so that the strength of the limiting beam is further improved by the frame structure, and part of the expansion force of the battery cell applied to the limiting beam is borne by the frame structure, thereby better improving the constraint performance of the limiting beam on the battery cell.

[0034] In some embodiments, the limiting beam has a notch at its end along the second direction, and the notch extends through the limiting beam along the first direction; at least a portion of the first constraint component is located within the notch and connected to the limiting beam.

[0035] In the technical solution of this embodiment, a notch is provided on the limiting beam to provide space for the connection between the first constraint component and the limiting beam, thereby facilitating the connection of the first constraint component to the limiting beam; at the same time, it also allows other parts of the limiting beam to be connected to the frame structure, thereby improving the constraint performance of the limiting beam on the battery cell.

[0036] In some embodiments, the second constraint assembly includes a second body, with its two ends respectively connected to two limiting beams; the second constraint assembly also includes a third cover disposed on the second body, the third cover at least covering the surface of the second body facing the battery cell assembly.

[0037] The technical solution of this embodiment provides a structure for some second constraint components, and a third cover is provided on the second body to reduce the risk of the second body directly contacting and damaging the battery cells, and to reduce the risk of short circuit between the second body and the battery cells.

[0038] Secondly, embodiments of this application also provide an electrical device, including the battery device provided in some embodiments of the first aspect.

[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0042] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0043] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0044] Figure 4A top view schematic diagram of a battery device provided by some embodiments of the present application after removing the top cover;

[0045] Figure 5 For Figure 4 A partial enlarged schematic view at A in the middle;

[0046] Figure 6 A perspective schematic diagram of a first constraint assembly provided by some embodiments of the present application;

[0047] Figure 7 A front view schematic diagram of a first constraint assembly provided by some embodiments of the present application;

[0048] Figure 8 A side view schematic diagram of a first constraint assembly provided by some embodiments of the present application;

[0049] Figure 9 A perspective schematic diagram of a limiting beam provided by some embodiments of the present application;

[0050] Figure 10 A perspective schematic diagram of a second constraint assembly provided by some embodiments of the present application.

[0051] The meanings of the labels in the figures are as follows:

[0052] 1000, vehicle;

[0053] 100, battery device;

[0054] 10, box body; 11, box body main body; 111, frame structure; 1111, position avoiding groove; 112, bottom plate; 113, top cover; 114, containing space; 12, limiting beam; 121, threaded structure; 122, notch;

[0055] 20, battery monomer assembly; 21, battery monomer; 211, shell; 212, end cover; 213, electrode assembly; 214, electrode terminal;

[0056] 30, first constraint assembly; 31, first main body; 32, first cover; 33, second cover; 34, gasket;

[0057] 40, second constraint assembly; 41, second main body; 42, third cover;

[0058] 50, bolt;

[0059] 200, motor;

[0060] 300, controller. DETAILED DESCRIPTION

[0061] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0063] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0064] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] 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, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0066] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0067] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled 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.

[0069] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the market demand is also increasing.

[0070] The battery monomer is easy to expand and deform in the process of charging and discharging cycle, and the expansion of adjacent battery monomers is easy to cause mutual extrusion and cause the deformation of the internal structure of the battery monomer, thereby causing negative influence on the stability of the battery monomer.

[0071] In order to suppress and constrain the expansion of the battery monomer, a limiting beam is usually arranged in the box body of the battery device at present, and the limiting beam abuts against the battery monomer, so as to suppress the expansion and deformation of the battery monomer by the limiting beam. However, in the use process of the battery device, there are some working conditions with high expansion force of the battery monomer, for example, with the increase of the use time and the decrease of the life of the battery monomer, the expansion force of the battery monomer will also increase; in these working conditions, the restraining force provided by the limiting beam is difficult to suppress the expansion of the battery monomer, thereby possibly causing the deformation of the internal structure of the battery monomer, and further possibly causing the decrease of the stability of the battery monomer.

[0072] In view of the above, in order to improve the insufficient constraint performance of the limiting beam on the expansion deformation of the battery device, the battery device provided by the embodiments of the present application is provided with a first constraint assembly, so that the two ends of the first constraint assembly and the second constraint assembly are connected to the two limiting beams respectively, and a second constraint assembly is also provided, and the two ends of the second constraint assembly are also connected to the two limiting beams respectively; at the same time, the first constraint assembly and the second constraint assembly are located on different sides of the battery monomer assembly respectively.

[0073] In such a battery device, the first constraint assembly and the second constraint assembly share the expansion force borne by the limiting beam, and provide a pulling force opposite to the direction of the expansion force borne by the limiting beam, so as to improve the performance of the limiting beam resisting the expansion deformation of the battery monomer and improve the constraint performance of the limiting beam; the first constraint assembly and the second constraint assembly are located on different sides of the battery monomer assembly respectively, so as to be connected to the limiting beam from different positions and improve the constraint performance of the limiting beam, and the space at different positions inside the battery device is utilized, so as to reduce the risk of excessive space occupation caused by the simultaneous arrangement of the first constraint assembly and the second constraint assembly on one side of the battery monomer assembly, and reduce the negative impact of the simultaneous arrangement of the first constraint assembly and the second constraint assembly on one side of the battery monomer assembly on the energy density of the battery device.

[0074] The battery device disclosed by the embodiments of the present application can be used in a power consumption device using the battery device as a power source or a variety of energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric automobile toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] The following embodiments take a power consumption device of an embodiment of the present application as an example for illustration.

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

[0077] In some embodiments of the present application, the battery can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Reference Figure 2 , Figure 2 An exploded structural schematic diagram of the battery device 100 is provided for some embodiments of the present application. The battery device 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 can include a plurality of battery cells 21 connected in series, in parallel, or in a mixed connection through a busbar component.

[0079] In some embodiments, the battery cell assembly 20 is generally formed by arranging a plurality of battery cells 21.

[0080] As an example, the battery cell assembly 20 can be a battery module formed by arranging and fixing a plurality of battery cells 21 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 21 with a cable tie.

[0081] In some embodiments, the battery device 100 can be a battery pack including a box 10 and one or more battery cell assemblies 20 accommodated in the box 10.

[0082] As an example, the battery cell assembly 20 can be a battery module, and the battery cell assembly 20 can be accommodated in the box 10 by fixing the battery module in the box 10.

[0083] As an example, the battery cell assembly 20 can also be accommodated in the box 10 by directly fixing a plurality of battery cells 21 in the box 10.

[0084] As an example, the box 10 can include a first box and a second box. The first box and the second box are buckled so that a closed space is formed inside the box 10 to accommodate the battery cell assembly 20. Here, closed means covered or closed, which can be sealed or unsealed. The first box can be a top cover 113 or a bottom plate 112.

[0085] As an example, the box 10 can include a top cover 113, a frame, and a bottom plate 112. The top cover 113 and the bottom plate 112 are respectively connected with the frame so that a closed space is formed inside the box 10 to accommodate the battery cell assembly 20.

[0086] In some embodiments, the case 10 can be part of a chassis structure of the vehicle 1000. For example, portions of the case 10 can be part of a floor of the vehicle 1000, or portions of the case 10 can be part of cross members and longitudinal members of the vehicle 1000.

[0087] Reference Figure 3 , Figure 3 A schematic diagram of a disassembled structure of a battery cell 21 is provided for some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes a battery. As shown in the diagram, the battery cell 21 includes an end cover 212, a case 211, an electrode assembly 213, and other functional components.

[0088] The end cover 212 refers to a component that covers the opening of the case 211 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the case 211 to fit the case 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is less likely to deform when subjected to extrusion and collision, and the battery cell 21 can have higher structural strength and improved safety performance. The end cover 212 can be provided with functional components such as an electrode terminal 214. The electrode terminal 214 can be used to electrically connect with the electrode assembly 213 for outputting or inputting the electrical energy of the battery cell 21. In some embodiments, the end cover 212 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 21 when the internal pressure or temperature reaches a threshold value. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the case 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0089] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery monomer 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is made to cover the opening to form the internal environment of the battery monomer 21. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is made to cover the shell 211. The shell 211 can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto.

[0090] The electrode assembly 213 is a component where electrochemical reactions occur in the battery monomer 21. One or more electrode assemblies 213 can be contained in the shell 211. The electrode assembly 213 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting the main body of the electrode assembly 213, and a portion without active material constituting the tab of the positive electrode sheet and the negative electrode sheet, respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab connects the electrode terminal 214 to form a current loop.

[0091] In a first aspect, with reference to Figures 4 to 6 The embodiments of the present application provide a battery device 100, which comprises a box body 10, a battery monomer assembly 20, a first constraint assembly 30 and a second constraint assembly 40. The box body 10 comprises a box body main body 11, and the box body main body 11 has a containing space 114, wherein at least two limiting beams 12 are arranged in the containing space 114 and are spaced apart along a first direction; the battery monomer assembly 20 is contained in the containing space 114, and the battery monomer assembly 20 is arranged between the two limiting beams 12, and the two ends of the battery monomer assembly 20 abut against the adjacent limiting beams 12, respectively; the two ends of the first constraint assembly 30 are connected to the two limiting beams 12, respectively, and the first constraint assembly 30 is arranged on at least one side of the battery monomer assembly 20 along a second direction; the two ends of the second constraint assembly 40 are connected to the two limiting beams 12, respectively, and the second constraint assembly 40 is arranged on at least one side of the battery monomer 21 along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0092] In the figure, the direction of the X-axis is the length direction of the battery device 100, the direction of the Y-axis is the width direction of the battery device 100, and the direction of the Z-axis is the height direction of the battery device 100.

[0093] The box body 10 refers to a structure in the battery device 100 that provides a containing space 114 for the battery monomer 21 and other structures. The battery monomer 21 is contained in the box body 10. The shape of the box body 10 can be prismatic, cylindrical, or other shapes. The material of the box body 10 can include metal, plastic, or other materials.

[0094] The box body 11 refers to a main body mechanism in the box body 10 that is mainly used to carry the battery monomer 21 and other structures. In the case where the box body 10 includes a first box body and a second box body, the first box body and the second box body can constitute the main structure of the box body 10. The shape of the box body 11 can be prismatic, cylindrical, or other shapes. The material of the box body 10 can include metal, plastic, or other materials.

[0095] The containing space 114 refers to a space structure in the box body 11 that is used to contain the battery monomer 21 and other structures. The containing space 114 is formed in the box body 11. The containing space 114 can be a prismatic space structure, a cylindrical space structure, or other shapes of space muscles. The shape of the containing space 114 can also be set according to the shape of the box body 11.

[0096] The box body 10 also includes a limiting beam 12, which refers to a beam structure in the box body 10 that is used to suppress the expansion of the battery monomer 21. The limiting beam 12 can be a box beam, an I-beam, or other shapes of beam structures. The limiting beam 12 is arranged in the containing space 114. The limiting beam 12 can be directly connected to the box body 11 or indirectly connected to the box body 11 through an intermediate structure. The limiting beam 12 can be connected to the box body 11 by welding, bonding, screwing, or other means. The material of the limiting beam 12 can include metal, plastic, or other materials.

[0097] The number of limiting beams 12 is at least two, that is, the number of limiting beams 12 can be two, or three or more. The at least two limiting beams 12 are arranged at intervals, so that the battery monomer assembly 20 is installed between the two limiting beams 12, and the limiting beam 12 can suppress the expansion deformation of the battery monomer 21 along the first direction from both sides of the battery monomer assembly 20.

[0098] The at least two limiting beams 12 are arranged along the first direction. The first direction can be the length direction X of the battery device 100, the first direction can also be the width direction Y of the battery device 100, or the first direction can be other directions. For example, the first direction is the length direction X of the battery device 100.

[0099] The battery cell assembly 20 refers to a structure composed of battery cells 21, the battery cell 21 refers to the smallest unit that constitutes the battery device 100, and the number of battery cells 21 can be one, two or more; the battery cell assembly 20 can include one battery cell 21, or two or more battery cells 21; in the case where the battery cell assembly 20 includes two or more battery cells 21, the battery cells 21 in the battery cell assembly 20 can be connected in series, parallel or mixed connection; the battery cells 21 in the battery cell assembly 20 can be arranged in one direction, or arrayed in two different directions; the battery cells 21 in the battery cell assembly 20 can be fixed and constrained by a binding belt, a plate body or other structures, or the battery cells 21 in the battery cell assembly 20 can be directly arranged in the accommodating space 114 of the first box body.

[0100] The number of battery cell assemblies 20 can be one, two or more; in the case where the number of battery cell assemblies 20 is two or more, each battery cell assembly 20 can be located between the same two limiting beams 12; in the case where the number of limiting beams 12 is three or more, any two adjacent limiting beams 12 can be provided with a battery cell assembly 20.

[0101] The two ends of the battery cell assembly 20 abut against the adjacent limiting beams 12, so that the limiting beams 12 can inhibit the swelling deformation of each battery cell 21 in the battery cell assembly 20.

[0102] The first constraint assembly 30 refers to a structure in the battery device 100 for improving the constraint performance of the limiting beam 12; the first constraint assembly 30 can be a strip-shaped or belt-shaped structure, or other shaped structures; the first constraint assembly 30 is connected to the limiting beam 12, and the first constraint assembly 30 can be connected to the limiting beam 12 by welding, bonding, screwing or other means; the number of first constraint assemblies 30 can be one, two or more.

[0103] The two ends of the first constraint assembly 30 are respectively connected to two limiting beams 12, in the case where the number of limiting beams 12 is two, the two ends of the first constraint assembly 30 are respectively connected to the two limiting beams 12; in the case where the number of limiting beams 12 is three or more, the two ends of the first constraint assembly 30 can be respectively connected to two adjacent limiting beams 12, or the first constraint assembly 30 can be connected to the two limiting beams 12 at the end of the first direction by passing through one or more limiting beams 12.

[0104] Because the limiting beams 12 are located on both sides of the battery monomer 21 along the first direction, the expansion force borne by the limiting beams 12 is directed from the battery monomer assembly 20 to the limiting beams 12; because the first constraint assembly 30 is connected to the two limiting beams 12, the first constraint assembly 30 provides a pulling force to the limiting beams 12, which is directed from the limiting beams 12 to the battery monomer assembly 20 between the two limiting beams 12, that is, the pulling force provided by the first constraint assembly 30 is opposite to the direction of the expansion force borne by the limiting beams 12, thereby improving the ability of the limiting beams 12 to suppress the expansion deformation of the battery monomer 21 and improving the constraint performance of the limiting beams 12 on the battery monomer 21.

[0105] The first constraint assembly 30 is arranged on at least one side of the battery monomer assembly 20 along the second direction; in the case of two or more first constraint assemblies 30, each first constraint assembly 30 can be located on both sides of the battery monomer assembly 20 along the second direction.

[0106] The second direction is perpendicular to the first direction, and the second direction can be the width direction Y of the battery device 100, or the height direction Z of the battery device 100 or other directions; for example, the second direction is the width direction Y of the battery device 100.

[0107] The second constraint assembly 40 refers to a structure in the battery device 100 for improving the constraint performance of the limiting beams 12; the second constraint assembly 40 can be a strip-shaped or belt-shaped structure, or other shaped structures; the second constraint assembly 40 is connected to the limiting beams 12, and the second constraint assembly 40 can be connected to the limiting beams 12 by welding, bonding, screwing or other means; the number of the second constraint assembly 40 can be one, two or more.

[0108] The two ends of the second constraint assembly 40 are respectively connected to the two limiting beams 12; in the case of two limiting beams 12, the two ends of the second constraint assembly 40 are respectively connected to the two limiting beams 12; in the case of three or more limiting beams 12, the two ends of the second constraint assembly 40 can be respectively connected to the two adjacent limiting beams 12, or the second constraint assembly 40 can be connected to the two limiting beams 12 at the most end in the second direction by bypassing one or more limiting beams 12.

[0109] Because the limiting beams 12 are located on both sides of the battery monomer 21 along the second direction, the expansion force borne by the limiting beams 12 is directed from the battery monomer assembly 20 to the limiting beams 12; because the second constraint assembly 40 is connected to the two limiting beams 12, the second constraint assembly 40 provides a pulling force to the limiting beams 12, which is directed from the limiting beams 12 to the battery monomer assembly 20 between the two limiting beams 12, that is, the pulling force provided by the second constraint assembly 40 is opposite to the direction of the expansion force borne by the limiting beams 12, thereby improving the ability of the limiting beams 12 to suppress the expansion deformation of the battery monomer 21 and improving the constraint performance of the limiting beams 12 on the battery monomer 21.

[0110] The second constraint assembly 40 is arranged on at least one side of the battery monomer assembly 20 along a third direction, the third direction being perpendicular to the first direction and the second direction, and the third direction can be the width direction Y of the battery device 100, or the height direction Z of the battery device 100 or other directions; for example, the third direction is the height direction Z of the battery device 100.

[0111] Since the limiting beams 12 are arranged in the first direction, the length direction of the first constraint assembly 30 and the second constraint assembly 40 is parallel to the first direction, and the two ends of the first constraint assembly 30 and the second constraint assembly 40 along the first direction are connected to the two limiting beams 12 respectively.

[0112] Since the electrode terminals 214 of the battery monomers 21, the sampling wire harness, the electrical connection structure and the like are located on one side of the battery monomer assembly 20 along the third direction, the space of the battery monomer assembly 20 on this side is limited, and the number of constraint assemblies that can be arranged on this side is also limited; accordingly, the first constraint assembly 30 and the second constraint assembly 40 are arranged on different sides of the battery monomer assembly 20 respectively, which facilitates the arrangement of the first constraint assembly 30 and the second constraint assembly 40 according to the space inside the box body 11, so as to make full use of the space inside the box body 11, which can not only improve the constraint performance of the limiting beams 12 through the first constraint assembly 30 and the second constraint assembly 40, but also reduce the negative impact of the first constraint assembly 30 and the second constraint assembly 40 on the energy density of the battery device 100.

[0113] For example, the first direction, the second direction and the third direction are the length direction X, the width direction Y and the height direction Z of the battery device 100 respectively. The electrode terminals 214 of the battery monomers 21, the sampling wire harness, the electrical connection structure and the like are located above the battery monomer assembly 20 along the height direction Z of the battery device 100, which results in that the second constraint assembly 40 can only be arranged at the gap of the electrode terminals 214, the sampling wire harness and the electrical connection structure, and the number of the second constraint assembly 40 is limited, and the insufficient number of the second constraint assembly 40 can easily result in that the constraint performance of the limiting beams 12 cannot meet the requirements. Accordingly, the first constraint assembly 30 is arranged, and the first constraint assembly 30 is arranged on both sides of the battery monomer assembly 20 along the width direction Y of the battery device 100, which not only increases the number of constraint assemblies to improve the constraint performance of the limiting beams 12, but also makes full use of the gap between the battery monomer assembly 20 and the box body 11 in the width direction Y.

[0114] In the embodiment, the first constraint assembly 30 and the second constraint assembly 40 are arranged to improve the performance of the limiting beam 12 against the expansion deformation of the battery monomer 21 through the first constraint assembly 30 and the second constraint assembly 40, improve the strength of the limiting beam 12, and improve the constraint performance of the limiting beam 12; the first constraint assembly 30 and the second constraint assembly 40 are arranged on different sides of the battery monomer assembly 20 respectively, so as to be connected with the limiting beam 12 from different positions and improve the constraint performance of the limiting beam 12, and the space at different positions inside the battery device 100 is utilized, so as to reduce the risk of excessive space occupation caused by the simultaneous arrangement of the first constraint assembly 30 and the second constraint assembly 40 on one side of the battery monomer assembly 20, and reduce the negative influence of the simultaneous arrangement of the first constraint assembly 30 and the second constraint assembly 40 on one side of the battery monomer assembly 20 on the energy density of the battery device 100.

[0115] Reference Figure 4 、 Figure 5 In some embodiments, the first constraint assembly 30 is arranged to be spaced apart from the battery monomer assembly 20 along the second direction; and / or, the second constraint assembly 40 is arranged to be pressed on the battery monomer assembly 20 along the third direction.

[0116] The first constraint assembly 30 is arranged to be spaced apart from the battery monomer assembly 20 along the second direction, that is, there is a gap between the first constraint assembly 30 and the battery monomer assembly 20, so that the first constraint assembly 30 is not easy to directly contact the battery monomer assembly 20, thereby reducing the risk of collision and damage of the battery monomer 21 by the first constraint assembly 30, and reducing the risk of short circuit of the first constraint assembly 30 and the battery monomer 21.

[0117] The second constraint assembly 40 is arranged to be pressed on the battery monomer assembly 20 along the third direction, so as to better fix the battery monomer assembly 20 in the accommodating space 114.

[0118] In the embodiment, the first constraint assembly 30 is arranged to be spaced apart from the battery monomer assembly 20, so as to reduce the risk of collision and damage of the battery monomer 21 by the second constraint assembly 40.

[0119] Reference Figures 6 to 8 In some embodiments, the first constraint assembly 30 comprises a first body 31, both ends of the first body 31 are connected to the two limiting beams 12 respectively; the first constraint assembly 30 further comprises a first cover 32 arranged on the first body 31, the first cover 32 covers at least a part of the surface of the first body 31 corresponding to the battery monomer assembly 20.

[0120] The first main body 31 refers to a structure connected to the limiting beam 12 by the first constraint assembly 30, and is a main structure for the first constraint assembly 30 to provide a pulling force to the limiting beam 12 and share part of the expansion force on the limiting beam 12. The first main body 31 can be a strip-shaped structure, a belt-shaped structure, or a structure of other shapes. The two ends of the first main body 31 are respectively connected to two limiting beams 12, and the first main body 31 can be connected to the corresponding limiting beam 12 by welding, bonding, screwing, or other means. The material of the first main body 31 can include metal, plastic, or other materials.

[0121] The first cover 32 refers to a structure connected to the outer surface of the first main body 31. The first cover 32 can be connected to the first main body 31 by bonding, screwing, clamping, or other means. The first cover 32 can be directly connected to the first main body 31, or indirectly connected to the first main body 31 through an intermediate structure. The material of the first cover 32 can include plastic, rubber, or other materials.

[0122] The first cover 32 can at least cover the surface of the first main body 31 facing the battery monomer assembly 20, that is, the first cover 32 can only cover the surface of the first main body 31 facing the battery monomer assembly 20, or can cover one or more other surfaces of the first main body 31. The first cover 32 at least covers part of the surface of the first main body 31 facing the battery monomer assembly 20 corresponding to the battery monomer assembly 20, that is, the first cover 32 can only cover the part of the first main body 31 opposite to the battery monomer assembly 20, without covering the part of the first main body 31 connected to the limiting beam 12. In this way, the first cover 32 can not only reduce the risk of short circuit between the first main body 31 and the battery monomer 21, but also reduce the interference of the first cover 32 on the connection of the first main body 31 to the limiting beam 12.

[0123] The arrangement of the first cover 32 can make it difficult for the first main body 31 to directly contact the battery monomer 21, thereby reducing the risk of collision and damage of the first main body 31 to the battery monomer 21, and reducing the risk of short circuit between the first main body 31 and the battery monomer 21.

[0124] For example, in the case of a metal structure of the first main body 31, the surface of the first main body 31 can have burrs and other structures due to the processing process, which can easily damage the battery monomer 21. In addition, the metal first main body 31 directly contacting the battery monomer 21 can also easily cause short circuit with the battery monomer 21. Accordingly, the first cover 32 is arranged to reduce the risk of damage and short circuit of the first main body 31 to the battery monomer 21.

[0125] The embodiment provides specific structures of the first constraint assembly 30, so that the first cover 32 covers at least the surface of the first main body 31 facing the battery monomer assembly 20, so as to reduce the risk of the first constraint assembly 30 colliding with the battery monomer 21 and damaging the battery monomer 21; meanwhile, the risk of the burrs, micro-protruding structures and the like on the first main body 31 damaging the battery monomer 21 can also be reduced.

[0126] In some embodiments, the first cover 32 is an elastic structure.

[0127] The first cover 32 is an elastic structure, that is, the material of the first cover 32 includes an elastic material, which can include rubber, foam or other materials. For example, the material of the first cover 32 includes foam.

[0128] The first cover 32 is an elastic structure, in the case that the battery device 100 vibrates and causes the first constraint assembly 30 to collide with the battery monomer 21, the setting can make the first cover 32 contact the battery monomer 21 and absorb the collision energy through the first cover 32, so as to reduce the damage caused by the collision of the first constraint assembly 30 with the battery monomer assembly 20.

[0129] In the embodiment, the first cover 32 is an elastic structure, in the case that the first constraint assembly 30 collides with the battery monomer assembly 20, the first cover 32 can absorb the collision energy, so as to better reduce the risk of the first constraint assembly 30 damaging the battery monomer 21.

[0130] Reference Figures 6 to 8 In some embodiments, the first cover 32 is sleeved on the first main body 31.

[0131] The first cover 32 is sleeved on the first main body 31, that is, the first cover 32 surrounds the circumferential side of the first main body 31 along the direction perpendicular to the length direction of the first main body 31, so as to cover the circumferential surface of the first main body 31; since the limiting beams 12 are arranged in the first direction, the length direction of the first main body 31 is also parallel to the first direction, at this time, the first cover 32 surrounds and covers the circumferential side of the first main body 31 with the first direction as the axis.

[0132] In the case that the first cover 32 is sleeved on the first main body 31, the first cover 32 and the first main body 31 can be connected by adhesion, can be connected by interference fit, or an intermediate structure can be arranged between the first cover 32 and the first main body 31 and indirectly connected through the intermediate structure.

[0133] The arrangement enables the first cover 32 to cover multiple surfaces of the first body 31, so as to further reduce the risk of the first body 31 directly contacting the battery monomer 21, thereby better reducing the risk of the first body 31 colliding with and damaging the battery monomer 21 and better reducing the risk of the first body 31 short-circuiting with the battery monomer 21.

[0134] In the embodiment, the first cover 32 is arranged on the first body 31 to better cover the first body 31 and reduce the risk of the first body 31 directly contacting and damaging the battery monomer 21. In the case where the first body 31 is a metal structural member, the arrangement can also reduce the risk of the first body 31 short-circuiting with the battery monomer 21.

[0135] Reference Figures 6 to 8 In some embodiments, the first constraint assembly 30 further comprises a second cover 33 connected to one side of the first body 31 facing the battery monomer assembly 20, and the second cover 33 is made of a material different from that of the first cover 32. The first cover 32 is connected to the second cover 33 to indirectly connect to the first body 31.

[0136] The second cover 33 refers to a structure connected to the outer surface of the first body 31. The second cover 33 can be connected to the first body 31 by adhesion, screwing, clamping or other means. The second cover 33 can be directly connected to the first body 31 or indirectly connected to the first body 31 through an intermediate structure. The second cover 33 can at least cover the surface of the first body 31 facing the battery monomer assembly 20, i.e., the second cover 33 can only cover the surface of the first body 31 facing the battery monomer assembly 20 or can cover one or more other surfaces of the first body 31. The material of the second cover 33 can include plastic, rubber or other materials.

[0137] In the case where the second cover 33 at least covers the surface of the first body 31 facing the battery monomer assembly 20, the first cover 32 is connected to the second cover 33 to indirectly connect to the first body 31. At this time, both the first cover 32 and the second cover 33 at least cover the surface of the first body 31 facing the battery monomer assembly 20.

[0138] The arrangement of the second cover 33 can make it difficult for the first body 31 to directly contact the battery monomer 21, thereby reducing the risk of the first body 31 colliding with and damaging the battery monomer 21 and reducing the risk of the first body 31 short-circuiting with the battery monomer 21.

[0139] The first cover 32 and the second cover 33 are arranged on the side of the first body 31 facing the battery cell assembly 20, so as to further reduce the risk of the first body 31 directly contacting the battery cell 21, thereby better reducing the risk of the first body 31 colliding with and damaging the battery cell 21, and better reducing the risk of the first body 31 short-circuiting with the battery cell 21.

[0140] The first cover 32 and the second cover 33 are made of different materials, so as to meet different performance requirements of the first constraint assembly 30. For example, the first cover 32 can be an elastic structural member, and the second cover 33 can be an insulating structural member, which can reduce the damage to the battery cell 21 caused by the collision of the first constraint assembly 30 and reduce the risk of short-circuiting between the first body 31 and the battery cell 21; for example, the first cover 32 can be an elastic structural member, and the second cover 33 can be a hard structural member with low surface roughness, which can reduce the damage to the battery cell 21 caused by the collision of the first constraint assembly 30, reduce the risk of structural damage to the battery cell 21 on the first body 31, and improve the overall strength of the first constraint assembly 30.

[0141] In the embodiment, the second cover 33 is arranged, and the material of the second cover 33 is different from that of the first cover 32, so that the first cover 32 and the second cover 33 can respectively have different effects, so as to meet different requirements and better protect the battery cell 21.

[0142] Reference Figures 6 to 8 In some embodiments, the second cover 33 is sleeved on the first body 31, and the second cover 33 is a heat-shrinkable structural member.

[0143] The second cover 33 is sleeved on the first body 31, that is, the second cover 33 surrounds the circumferential side of the first body 31 along a direction perpendicular to the length direction of the first body 31, so as to cover the circumferential side surface of the first body 31; since the limiting beams 12 are arranged in the first direction, the length direction of the first body 31 is also parallel to the first direction, and at this time, the second cover 33 surrounds and covers the circumferential side of the first body 31 with the first direction as the axis.

[0144] The second cover 33 is a heat-shrinkable structural member, which can be deformed and shrunk by heating after being sleeved on the first body 31, so as to be connected to the first body 31; the material of the second cover 33 can include polyethylene, polytetrafluoroethylene, silicone rubber, or other materials.

[0145] In the case that the second cover 33 is sleeved on the first body 31, the first cover 32 can be sleeved on the second cover 33, or the first cover 32 can only cover part of the surface of the second cover 33 to indirectly connect to the first body 31.

[0146] This arrangement enables the second cover 33 to cover multiple surfaces of the first body 31, further reducing the risk of the first body 31 directly contacting the battery monomer 21, thereby better reducing the risk of the first body 31 colliding with and damaging the battery monomer 21, and better reducing the risk of the first body 31 short-circuiting with the battery monomer 21.

[0147] In this embodiment, the second cover 33 is a heat-shrinkable structure sleeved on the first body 31, so that the second cover 33 can better cover the first body 31, thereby better reducing the risk of the first body 31 directly contacting and damaging the battery monomer 21, and reducing the risk of the first body 31 short-circuiting with the battery monomer 21.

[0148] Reference Figure 4 、 Figure 5 、 Figure 10 In some embodiments, the limiting beam 12 is provided with a threaded structure 121, and the first constraint assembly 30 is connected to the limiting beam 12 through a bolt 50 cooperating with the threaded structure 121.

[0149] The threaded structure 121 refers to a mechanical connection structure provided on the limiting beam 12. The threaded structure 121 is provided on the side of the limiting beam 12 facing the first constraint assembly 30. The threaded structure 121 can include a nut connected to the limiting beam 12, or a threaded hole provided on the limiting beam 12. The number of threaded structures 121 can be one or two, and the number of threaded structures 121 can be set according to the number of first constraint assemblies 30.

[0150] The bolt 50 refers to a fastener with external threads that can cooperate with the threaded structure 121. The first constraint assembly 30 is connected to the limiting beam 12 through the cooperation of the bolt 50 and the threaded structure 121, that is, one end of the bolt 50 can pass through the first constraint assembly 30 and threadedly cooperate with the threaded structure 121 to press and fix the first constraint assembly 30 on the limiting beam 12.

[0151] For example, in the case that the first constraint assembly 30 includes the first body 31, a through hole is provided on the first body 31, and one end of the bolt 50 passes through the through hole and threadedly cooperates with the threaded structure 121 to press and fix the first body 31 on the limiting beam 12 through the other end of the bolt 50.

[0152] The embodiment provides specific structures of connecting the first constraint assembly 30 to the limiting beam 12, so that the first constraint assembly 30 can be stably connected to the limiting beam 12.

[0153] Reference Figures 4 to 8 In some embodiments, the bolt 50 is coated with a locking agent on the surface; and / or a gasket 34 is arranged between the bolt 50 and the first constraint assembly 30, and the gasket 34 is connected to the first constraint assembly 30.

[0154] The locking agent refers to an adhesive that can be coated on the thread surface of the bolt 50, and the locking agent can include polyamide, acrylate, polyvinyl acetate or other materials; after the bolt 50 is matched with the threaded structure 121, the locking agent can absorb the relative vibration between the thread and the threaded structure 121, thereby reducing the risk of the bolt 50 exiting the threaded structure 121 and improving the connection stability between the bolt 50 and the threaded structure 121.

[0155] The gasket 34 refers to a sheet-shaped structural member arranged between the bolt 50 and the limiting beam 12, and the arrangement of the gasket 34 can disperse the force applied by the bolt 50 to the corresponding surface of the first constraint assembly 30, so as to protect the corresponding part of the first constraint assembly 30, and can also supplement the gap and tolerance between the corresponding part of the bolt 50 and the first constraint assembly 30. In the case that the bolt 50 is pressed on the gasket 34, the gasket 34 can be slightly deformed and apply a reverse force to the bolt 50, and the reverse force can form a pre-tightening force between the bolt 50 and the threaded structure 121, increase the friction between the bolt 50 and the threaded structure 121, reduce the risk of the bolt 50 exiting the threaded structure 121, and improve the connection stability between the bolt 50 and the threaded structure 121.

[0156] The locking agent can be coated on the surface of the bolt 50 only or the gasket 34 can be arranged only, or the gasket 34 can be arranged while the locking agent is coated on the surface of the bolt 50, so as to further reduce the risk of the bolt 50 exiting the threaded structure 121.

[0157] In the embodiment, the bolt 50 is coated with the locking agent on the surface and / or the gasket 34 is arranged, so as to reduce the risk of the bolt 50 exiting the threaded structure 121 in the use process and improve the stability of connecting the first constraint assembly 30 to the limiting beam 12.

[0158] Reference Figure 4 , Figure 5 In some embodiments, the first constraint assembly 30 is connected to one end of the limiting beam 12 along the second direction; the box body 11 is recessed with a position-avoiding groove 1111 on the side of the box body 11 facing the limiting beam 12 along the second direction, and the position-avoiding groove 1111 is arranged correspondingly to the limiting beam 12.

[0159] The first constraint assembly 30 is located on one side of the battery cell assembly 20 along the second direction, and is connected to one end of the limiting beam 12 along the second direction. The first constraint assembly 30 is located in the box body 11 and on one side of the box body 11 along the second direction.

[0160] The avoidance slot 1111 is a groove structure provided on the box body 11. The avoidance slot 1111 can be a semicircular groove, a square groove, or other groove structures. The avoidance slot 1111 is provided on the side of the box body 11 along the second direction facing the limiting beam 12, i.e., the avoidance slot 1111 corresponds to the position where the first constraint assembly 30 is connected to the limiting beam 12.

[0161] In the case where the first constraint assembly 30 is connected to the limiting beam 12 by the bolt 50 or other connecting structures, part of the connecting structure can be located in the avoidance slot 1111.

[0162] In the case where the length direction of the limiting beam 12 is parallel to the second direction, the distance between one end of the limiting beam 12 along the second direction and the adjacent part of the box body 11 is small. In this case, it is difficult to connect the first constraint assembly 30 to the limiting beam 12. Accordingly, the avoidance slot 1111 is provided on the side of the box body 11 along the second direction facing the limiting beam 12 to provide space for the connection of the first constraint assembly 30 and the limiting beam 12, thereby facilitating the connection of the first constraint assembly 30 to the limiting beam 12 and reducing the difficulty of connecting the first constraint assembly 30 to the side of the limiting beam 12 along the second direction.

[0163] In the embodiment, the avoidance slot 1111 is provided on the box body 11 to provide space for the connection of the first constraint assembly 30 and the limiting beam 12, thereby facilitating the connection of the first constraint assembly 30 to the limiting beam 12.

[0164] In some embodiments, the battery cell assembly 20 includes the battery cell 21 and a first electrical connection structure connected to the battery cell 21. The first electrical connection structure is located on one side of the battery cell 21 along the second direction. In the third direction, the first electrical connection structure is spaced apart from the first constraint assembly 30.

[0165] The battery monomer 21 refers to the smallest unit constituting the battery device 100, and the number of battery monomers 21 can be one, two or more; the battery monomer assembly 20 can include one battery monomer 21, or two or more battery monomers 21; in the case of the battery monomer assembly 20 including two or more battery monomers 21, each battery monomer 21 in the battery monomer assembly 20 can be connected in series, parallel or mixed connection; each battery monomer 21 in the battery monomer assembly 20 can be arranged in one direction, or arrayed in two different directions; each battery monomer 21 in the battery monomer assembly 20 can be fixed and constrained by a binding belt, a plate body or other structures, and each battery monomer 21 in the battery monomer assembly 20 can also be directly arranged in the accommodating space 114 of the first box body.

[0166] The first electric connection structure refers to a structure in the battery monomer assembly 20 for electrically connecting adjacent battery monomers 21 or for electrically connecting with other structures in the battery device 100, and the material of the first electric connection structure can include aluminum, aluminum alloy, copper or other materials.

[0167] For example, the first electric connection structure is a long strip-shaped tab in the battery monomer assembly 20, the first electric connection structure is used to connect the battery monomer assembly 20 and the low-voltage device in the battery device 100, the tab is located on one side or both sides of the battery monomer assembly 20 along the second direction, and the tab extends from one end of the battery monomer assembly 20 to the other end of the battery monomer assembly 20 along the first direction and is connected with the low-voltage device; further, the first electric connection structure is an aluminum tab.

[0168] The first electric connection structure is located on one side of the battery monomer assembly 20 along the second direction, and the first constraint assembly 30 is also located on one side of the battery monomer assembly 20 along the second direction; accordingly, the first electric connection structure and the first constraint assembly 30 are spaced apart to reduce the risk of mutual interference between the first electric connection structure and the first constraint assembly 30.

[0169] The first electric connection structure and the first constraint assembly 30 are spaced apart along the third direction, which can reduce the space occupation of the first electric connection structure and the first constraint assembly 30 in the second direction, so that the arrangement of the first electric connection structure and the first constraint assembly 30 is more reasonable, thereby reducing the negative impact of the first electric connection structure and the first constraint assembly 30 on the energy density of the battery device 100.

[0170] In this embodiment, the battery monomer assembly 20 includes the first electric connection structure, and the first electric connection structure is spaced apart from the first constraint assembly 30, so that the first electric connection structure avoids the first constraint assembly 30, thereby reducing the risk of collision and damage of the first electric connection structure by the first constraint assembly 30, and also reducing the risk of short circuit between the first constraint assembly 30 and the first electric connection structure.

[0171] In some embodiments, the battery cell assembly 20 includes the battery cell 21 and a second electrical connection structure connected to the battery cell 21, the second electrical connection structure being located at one side of the battery cell 21 along the third direction.

[0172] The second electrical connection structure refers to other electrical connection structures in the battery cell assembly 20 different from the first electrical connection structure, and the second electrical connection structure can include a sampling harness or other electrical connection structures. For example, the second electrical connection structure refers to a low-voltage harness in the battery cell assembly 20.

[0173] The second electrical connection structure is arranged at one side of the battery cell assembly 20 along the third direction, and the first constraint assembly 30 is arranged at one side of the battery cell assembly 20 along the second direction. Therefore, the arrangement can make the second electrical connection structure difficult to interfere with the first constraint assembly 30, thereby reducing the risk of mutual interference between the second electrical connection structure and the first constraint assembly 30.

[0174] In the embodiment, the battery cell assembly 20 includes the second electrical connection structure, and the second electrical connection structure and the first constraint assembly 30 are arranged at different sides of the battery cell assembly 20, thereby reducing the risk of collision and damage of the second electrical connection structure by the first constraint assembly 30, and also reducing the risk of short circuit between the first constraint assembly 30 and the second electrical connection structure.

[0175] Reference Figure 2 , Figure 4 , Figure 5 In some embodiments, the box body 11 includes a frame structure 111, a bottom plate 112, and a top cover 113, the accommodation space 114 extends through the frame structure 111 along the third direction, and the bottom plate 112 and the top cover 113 are connected to two sides of the frame structure 111 along the third direction, respectively. The limiting beam 12 and the battery cell assembly 20 are connected to one side of the bottom plate 112 along the third direction facing the accommodation space 114, and the second constraint assembly 40 is pressed to one side of the battery cell assembly 20 away from the bottom plate 112.

[0176] The frame structure 111 refers to a structure in the box body 11 for providing side protection for the battery cell assembly 20. The frame structure 111 can include a plurality of edge beams connected in sequence, and the frame structure 111 can be a quadrilateral square frame structure, or a pentagonal, hexagonal, or other shape frame structure. The beam body in the frame structure 111 can be a box beam, or an I-beam or other shape beam structure. The material of the frame structure 111 can include plastic or other materials.

[0177] The accommodating space 114 is through the frame structure 111 along the third direction, the accommodating space 114 can be a prismatic space structure, also can be a cylindrical space structure or other shape space structure, the shape of the accommodating space 114 can also be set according to the shape of the frame structure 111;The accommodating space 114 is through the frame structure 111, that is, the frame structure 111 can be a ring structure surrounding the accommodating space 114.

[0178] The third direction can be the height direction Z of the battery device 100, can also be other direction;The third direction is the height direction Z of the battery device 100 for example.

[0179] The bottom plate 112 refers to the structure in the box body 11 for carrying the battery monomer assembly 20 or other structure, the bottom plate 112 can be a circular plate structure, a square plate structure or other shape plate structure;The bottom plate 112 is connected to the frame structure 111, the bottom plate 112 can be connected to the frame structure 111 by welding, bonding, screwing or other ways, the bottom plate 112 can also be integrally formed with the frame structure 111;The material of the bottom plate 112 can include metal, plastic or other materials, the material of the bottom plate 112 can be the same as the material of the frame structure 111, also can be different.

[0180] The top cover 113 refers to the structure in the box body 11 for closing the accommodating space 114, the top cover 113 can be a circular plate structure, a square plate structure or other shape plate structure, the top cover 113 can also be a box type structure with one end opening or other shape structure;The top cover 113 is connected to the frame structure 111, the top cover 113 can be connected to the frame structure 111 by welding, bonding, screwing or other ways, the top cover 113 can also be integrally formed with the frame structure 111;The material of the top cover 113 can include metal, plastic or other materials, the material of the top cover 113 can be the same as the material of the frame structure 111, also can be different.

[0181] The bottom plate 112 and the top cover 113 are respectively connected to both sides of the frame structure 111 along the first direction, at this time, the bottom plate 112 and the top cover 113 can close the accommodating space 114, so that the accommodating space 114 becomes a closed space structure;In the case that the box 10 includes a first box and a second box, the bottom plate 112 can be connected to the frame structure 111 and serve as the first box, and the top cover 113 can serve as the second box;In the case that the battery device 100 is arranged on the vehicle 1000, the top cover 113 can also serve as the floor structure of the vehicle 1000.

[0182] The limiting beam 12 can be connected to the bottom plate 112 on the side facing the accommodating space 114 in the third direction, so that the limiting beam 12 can be connected to the bottom plate 112 and located in the accommodating space 114; the limiting beam 12 can be connected to the bottom plate 112 by bonding, welding, screwing or other means; the limiting beam 12 can be connected to the bottom plate 112 only, and the limiting beam 12 can also be connected to the frame structure 111 and / or the top cover 113.

[0183] The battery cell assembly 20 is connected to the bottom plate 112 on the side facing the accommodating space 114 in the third direction, so that the battery cell assembly 20 can be connected to the bottom plate 112 and located in the accommodating space 114; the battery cell assembly 20 can be connected to the bottom plate 112 by bonding, screwing or other means.

[0184] In the case where the second electrical connection structure is located on the side of the battery cell assembly 20 in the third direction, the second electrical connection structure is located on the side of the battery cell assembly 20 away from the bottom plate 112, that is, the second electrical connection structure is located between the battery cell assembly 20 and the top cover 113.

[0185] Because the second constraint assembly 40 is located on the side of the battery cell assembly 20 in the third direction, that is, the second constraint assembly 40 is located on the side of the battery cell assembly 20 away from the bottom plate 112, that is, the second constraint assembly 40 is located between the battery cell assembly 20 and the top cover 113; the second constraint assembly 40 is pressed on the battery cell assembly 20 on the side of the battery cell assembly 20 away from the bottom plate 112, so as to press the battery cell assembly 20 on the bottom plate 112, thereby playing an auxiliary fixing effect on the battery cell assembly 20.

[0186] For example, the second constraint assembly 40 is pressed on the shoulder of the battery cell 21 in the battery cell assembly 20; in the width direction Y of the battery device 100, the second constraint assembly 40 is pressed on two adjacent battery cells 21 at the same time.

[0187] The embodiment provides some specific structures of the box body 11, so that the battery cell assembly 20 is connected to the bottom plate 112, and the second constraint assembly 40 is also located on the side of the battery cell assembly 20 in the third direction, so as to better fix the battery cell assembly 20 in the accommodating space 114 by the second constraint assembly 40 and the bottom plate 112.

[0188] Reference Figure 4 In some embodiments, the limiting beam 12 is connected to the frame structure 111 at both ends in the second direction.

[0189] The two ends of the limiting beam 12 along the second direction are connected to the frame structure 111, and the limiting beam 12 can be connected to the frame structure 111 by welding, bonding, screwing or other means; under this arrangement, the frame structure 111 can also share part of the expansion force borne by the limiting beam 12, thereby improving the strength of the limiting beam 12 and improving the restraining performance of the limiting beam 12.

[0190] The end of the limiting beam 12 along the second direction can be completely connected to the frame structure 111 or only partially connected to the frame structure 111. In the case where the end of the limiting beam 12 along the second direction is completely connected to the frame structure 111, the first restraining assembly 30 can be connected to the side of the limiting beam 12 facing the battery monomer assembly 20, or can pass through the limiting beam 12 to be connected to the side of the limiting beam 12 away from the battery monomer assembly 20, or can be indirectly connected to the limiting beam 12 through an intermediate structure; in the case where the end of the limiting beam 12 along the second direction is only partially connected to the frame structure 111, the first restraining assembly 30 can be connected to the part of the end of the limiting beam 12 along the second direction that is not connected to the frame structure 111.

[0191] In the embodiment, the limiting beam 12 is connected to the frame structure 111 to further improve the strength of the limiting beam 12 through the frame structure 111 and bear part of the expansion force of the battery monomer 21 applied to the limiting beam 12, thereby better improving the restraining performance of the limiting beam 12 to the battery monomer 21.

[0192] Reference Figure 9 In some embodiments, a notch 122 is provided on the end of the limiting beam 12 along the second direction, and the notch 122 penetrates the limiting beam 12 along the first direction; at least part of the first restraining assembly 30 is located in the notch 122 and connected to the limiting beam 12.

[0193] The notch 122 refers to a recess structure provided on the end of the limiting beam 12 along the second direction, which can be a prismatic space structure, a semicircular space structure or other space structure; the notch 122 is recessed towards the inside of the limiting beam 12 along the length direction of the limiting beam 12, that is, the notch 122 is recessed towards the inside of the limiting beam 12 along the second direction, and at the same time, the notch 122 penetrates the limiting beam 12 along the first direction.

[0194] In the case where the notch 122 is provided on the end of the limiting beam 12 along the second direction, only part of the end of the limiting beam 12 can be connected to the frame structure 111, and the part corresponding to the notch 122 is not connected to the frame structure 111; at this time, the notch 122 forms a mounting space between the end of the limiting beam 12 and the frame structure 111, so that the first restraining assembly 30 is connected to the end of the limiting beam 12 along the second direction.

[0195] In this embodiment, the notch 122 is arranged on the limiting beam 12 to provide space for the connecting part of the first constraint assembly 30 and the limiting beam 12, thereby facilitating the connection of the first constraint assembly 30 to the limiting beam 12, and meanwhile enabling other parts of the limiting beam 12 to be connected to the frame structure 111, thereby better improving the constraint performance of the limiting beam 12 on the battery monomer 21.

[0196] Reference Figure 10 In some embodiments, the second constraint assembly 40 comprises a second body 41, both ends of the second body 41 being connected to two limiting beams 12 respectively; the second constraint assembly 40 further comprises a third cover 42 arranged on the second body 41, the third cover 42 covering at least the surface of the second body 41 facing the battery monomer assembly 20.

[0197] The second body 41 refers to the structure connecting the second constraint assembly 40 to the limiting beam 12, and is also the main structure of the second constraint assembly 40 for providing tension to the limiting beam 12 and sharing part of the expansion force on the limiting beam 12; the second body 41 can be a strip-shaped structure, a belt-shaped structure or other shaped structures; both ends of the second body 41 are connected to two limiting beams 12 respectively, and the second body 41 can be connected to the corresponding limiting beam 12 by welding, bonding, screwing or other means; the material of the second body 41 can include metal, plastic or other materials.

[0198] The third cover 42 refers to the structure connected to the outer surface of the second body 41, and the third cover 42 can be connected to the second body 41 by bonding, screwing, clamping or other means; the third cover 42 can be directly connected to the second body 41 or indirectly connected to the second body 41 through an intermediate structure; the third cover 42 can cover at least the surface of the second body 41 facing the battery monomer assembly 20, i.e. the third cover 42 can only cover the surface of the second body 41 facing the battery monomer assembly 20, or can cover one or more other surfaces of the second body 41 simultaneously; the material of the third cover 42 can include plastic, rubber or other materials.

[0199] The arrangement of the third cover 42 can make it difficult for the second body 41 to directly contact the battery monomer 21, thereby reducing the risk of the second body 41 colliding with and damaging the battery monomer 21, and also reducing the risk of short circuit between the second body 41 and the battery monomer 21.

[0200] In the example, in the case that the second body 41 is a metal structural member, burrs or other structures may exist on the surface of the second body 41 due to the machining process, which are easy to damage the battery monomer 21, and the direct contact of the metal second body 41 with the battery monomer 21 is also easy to short-circuit the battery monomer 21. Accordingly, the third cover 42 is arranged to reduce the risk of damage and short-circuit of the second body 41 to the battery monomer 21.

[0201] The embodiment provides some structures of the second constraint assembly 40, and the third cover 42 is arranged on the second body 41 to reduce the risk of direct contact of the second body 41 with the battery monomer 21 and damage to the battery monomer 21, and the risk of short-circuit of the second body 41 to the battery monomer 21 can be reduced.

[0202] In some embodiments, the battery device 100 includes a box body 10, a battery monomer assembly 20, a first constraint assembly 30, and a second constraint assembly 40.

[0203] The box body 10 includes a box body 11, and the box body 11 includes a frame structure 111, a bottom plate 112, and a top cover 113. The frame structure 111 has an accommodation space 114 arranged through in the height direction Z of the battery device 100. The bottom plate 112 and the top cover 113 are connected to the lower side and the upper side of the frame structure 111 in the height direction Z of the battery device 100, respectively, to form a closed accommodation space 114.

[0204] The box body 10 further includes two limiting beams 12, and the two limiting beams 12 are connected to the bottom plate 112. The two limiting beams 12 are arranged at intervals in the length direction X of the battery device 100, and the length directions of the two limiting beams 12 are parallel to the width direction Y of the battery device 100. Threaded structures 121 are arranged on both ends of the limiting beam 12 in the width direction Y of the battery device 100.

[0205] The frame structure 111 is provided with an avoiding groove 1111 on the side facing the limiting beam 12, and the avoiding groove 1111 is arranged corresponding to one end of the limiting beam 12 in the width direction Y of the battery device 100.

[0206] The battery monomer assembly 20 has a plurality of battery monomer assemblies 20 arranged in the width direction Y of the battery device 100. Each battery monomer assembly 20 is arranged between the two limiting beams 12, and the two ends of the battery monomer assembly 20 in the length direction X of the battery device 100 abut against the two limiting beams 12, respectively.

[0207] The first constraint assembly 30 has two first constraint assemblies 30 arranged on both sides of the battery monomer assembly 20 in the width direction Y of the battery device 100, and the first constraint assembly 30 is arranged at intervals with the battery monomer assembly 20.

[0208] The first constraint assembly 30 comprises a first main body 31, the length direction of the first main body 31 is parallel to the length direction X of the battery device 100, two ends of the first main body 31 along the length direction are connected to one end of the two limiting beams 12 along the width direction Y of the battery device 100 respectively, and the end of the first main body 31 connected with the limiting beam 12 corresponds to the avoiding groove 1111; the first main body 31 is connected to the limiting beam 12 through the bolt 50 connected to the threaded structure 121.

[0209] The first constraint assembly 30 further comprises a first cover 32 and a second cover 33, the first cover 32 is a foam structure, and the second cover 33 is a heat-shrink structure; the second cover 33 covers the first main body 31 along the length direction of the first main body 31, and the first cover 32 covers the second cover 33 along the length direction of the first main body 31, so as to form a double-layer covering structure outside the first main body 31.

[0210] The second constraint assembly 40 is provided above the battery monomer assembly 20 along the height direction Z of the battery device 100, and the number of the second constraint assemblies 40 is less than the number of the battery monomer assemblies 20 by one, and one second constraint assembly 40 is pressed and held between two battery monomer assemblies 20.

[0211] The second constraint assembly 40 comprises a second main body 41, the length direction of the second main body 41 is parallel to the length direction X of the battery device 100, and two ends of the second main body 41 along the length direction are connected to one side of the two limiting beams 12 along the height direction Z of the battery device 100 respectively.

[0212] The second constraint assembly 40 further comprises a third cover 42, the third cover 42 is a heat-shrink structure, and the third cover 42 covers the second main body 41 along the length direction of the second main body 41.

[0213] In the second aspect, the embodiments of the present application further provide a power consumption device comprising the battery device 100 provided by some embodiments of the first aspect.

[0214] The power consumption device can be a vehicle 1000, or a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft or other power consumption device using the battery device 100 as a power source or an energy storage element.

[0215] In the power consumption device, each battery monomer 21 in the battery device 100 is constrained by the limiting beam 12, the first constraint assembly 30 and the second constraint assembly 40, the battery monomer 21 is less likely to be damaged due to expansion caused by charging and discharging cycles, the stability of the battery device 100 is better, and the service life is longer.

[0216] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box includes a box body, the box body having an accommodating space, and the accommodating space having at least two limiting beams arranged at intervals along a first direction; A battery cell assembly is housed within the housing space, with the battery cell assembly positioned between two adjacent limiting beams, and both ends of the battery cell assembly abutting against the adjacent limiting beams respectively. A first constraint component is provided on at least one side of the battery cell assembly along the second direction, and the first constraint component is connected to one end of the limiting beam along the second direction. The second constraint component is connected to the two limiting beams at both ends, and the battery cell is provided with the second constraint component on at least one side along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other; The main body of the box is recessed in one side of the box facing the limiting beam along the second direction, and the recess is correspondingly provided with the limiting beam to accommodate at least a portion of the first constraint component; and / or the limiting beam is provided with a notch at its end along the second direction to accommodate at least a portion of the first constraint component.

2. The battery device according to claim 1, characterized in that, The first constraint component is spaced apart from the battery cell assembly along the second direction; and / or The second constraint component presses against the battery cell assembly along the third direction.

3. The battery device according to claim 1 or 2, characterized in that, The first constraint component includes a first body, with both ends of the first body connected to the two limiting beams respectively; The first constraint component further includes a first cover disposed on the first body, the first cover covering at least the portion of the surface of the first body facing the battery cell assembly that corresponds to the battery cell assembly.

4. The battery device according to claim 3, characterized in that, The first cover is an elastic structural component.

5. The battery device according to claim 3, characterized in that, The first cover is fitted onto the first body.

6. The battery device according to claim 3, characterized in that, The first constraint component further includes a second cover, which is connected to the side of the first body facing the battery cell assembly, and the second cover is made of a different material than the first cover. The first cover is connected to the second cover to indirectly connect to the first body.

7. The battery device according to claim 6, characterized in that, The second cover is fitted onto the first body, and the second cover is a heat-shrinkable structural component.

8. The battery device according to claim 1 or 2, characterized in that, The limiting beam is provided with a threaded structure, and the first constraint component is connected to the limiting beam by bolts that mate with the threaded structure.

9. The battery device according to claim 8, characterized in that, The bolt surface is coated with a locking agent; and / or A gasket is provided between the bolt and the first constraint component, and the gasket is connected to the first constraint component.

10. The battery device according to claim 1 or 2, characterized in that, The battery cell assembly includes a battery cell and a first electrical connection structure connected to the battery cell, wherein the first electrical connection structure is located on one side of the battery cell along the second direction; In the third direction, the first electrical connection structure is spaced apart from the first constraint component.

11. The battery device according to claim 1 or 2, characterized in that, The battery cell assembly includes a battery cell and a second electrical connection structure connected to the battery cell, the second electrical connection structure being located on one side of the battery cell along the third direction.

12. The battery device according to claim 1 or 2, characterized in that, The main body of the box includes a frame structure, a bottom plate and a top cover. The accommodating space extends through the frame structure along the third direction. The bottom plate and the top cover are respectively connected to both sides of the frame structure along the third direction. The limiting beam and the battery cell assembly are both connected to the base plate on the side facing the receiving space along the third direction, and the second constraint assembly presses against the side of the battery cell assembly away from the base plate.

13. The battery device according to claim 12, characterized in that, The limiting beam is connected to the frame structure at both ends along the second direction.

14. The battery device according to claim 1 or 2, characterized in that, The second constraint component includes a second body, the two ends of which are respectively connected to the two limiting beams; The second constraint component further includes a third cover disposed on the second body, the third cover covering at least the surface of the second body facing the battery cell assembly.

15. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-14.

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