Battery device and electric device

Abstract

The application belongs to the technical field of batteries, and provides a battery device and a power utilization device. The battery device comprises a box body with a containing space and a battery monomer installed in the containing space; the box body comprises a main body and a limiting beam; the main body comprises a main body plate and a protruding part, the battery monomer is supported on the main body plate, the protruding part is arranged to extend from the main body plate to the side of the main body plate along the height direction of the box body, the protruding part is formed with a containing space, and the limiting beam is installed in the containing space. By arranging the protruding part on the main body plate, the structural strength of the main body plate can be increased; by forming the containing space in the protruding part and installing the limiting beam in the containing space, the structural strength of the protruding part can be supported and strengthened through the limiting beam, then the limiting beam is fixedly connected with the main body plate, and the expansion deformation of the battery monomer is limited through the cooperation of the limiting beam and the protruding part, so that the anti-expansion performance of the box body is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more 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] A limiting beam is generally installed in the box body of the battery device to limit the expansion deformation of the battery monomer. In the case of different limiting beams and bottom plate materials, the limiting beam is currently directly fixed to the bottom plate of the box body. When subjected to the resisting force generated by the expansion of the battery monomer, the connection between the limiting beam and the bottom plate is prone to deformation or loosening, resulting in weak anti-expansion performance of the box body. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a battery device and a power utilization device to improve the problem of weak anti-expansion performance of the box body caused by the direct installation of the limiting beam on the bottom plate in the related art.

[0005] In a first aspect, the embodiments of the present application provide a battery device, comprising a box body having a containing space and a battery monomer installed in the containing space; the box body comprises a box main body and a limiting beam;

[0006] The box main body comprises a main plate and a protruding portion connected to the main plate, the battery monomer is supported on the main plate, the protruding portion is provided on the main plate and extends towards the side of the main plate along the height direction of the box body, the protruding portion forms a containing space, and the limiting beam is installed in the containing space.

[0007] In the technical solution of the embodiments of the present application, the structure strength of the main plate can be increased by providing the protruding portion on the main plate, the structure strength of the protruding portion can be supported and strengthened by forming the containing space in the protruding portion and installing the limiting beam in the containing space, the limiting beam and the main plate are fixedly connected, and the expansion deformation of the battery monomer is limited by the cooperation of the limiting beam and the protruding portion, so as to improve the anti-expansion performance of the box body.

[0008] In some embodiments, the protruding portion comprises a first plate body and a second plate body, the first plate body is provided on one side of the main plate along the height direction of the box body, the second plate body connects the first plate body and the main plate, and the first plate body is fixedly connected to the end face of the limiting beam away from the main plate.

[0009] Through the above technical solution, the first plate body is provided to facilitate the connection and fixation of the limiting beam, and the second plate body is provided to facilitate the connection of the first plate body and the main plate; the first plate body and the second plate body form the protruding portion, which is simple in structure and easy to manufacture.

[0010] In some embodiments, the first plate body is fixedly connected with the limiting beam through a fastener.

[0011] Through the above technical solution, the first plate body and the limiting beam can be firmly fixed, and the connection strength is improved.

[0012] In some embodiments, the limiting beam is provided with a second plate body at least on one side close to the battery monomer.

[0013] Through the above technical solution, the second plate body is provided on the side of the limiting beam close to the battery monomer, and the second plate body is supported by the limiting beam, so that the battery monomer is supported by the second plate body, and the expansion deformation force of the battery monomer does not directly act on the limiting beam, thereby reducing the risk of deformation or damage of the contact part of the limiting beam and the main plate, and improving the anti-expansion performance of the box body.

[0014] In some embodiments, the limiting beam is connected with the inner surface of the protruding part by bonding.

[0015] Through the above technical solution, the limiting beam is connected with the inner surface of the protruding part by bonding, so as to facilitate the installation and fixation of the limiting beam, and the limiting beam can more stably support the protruding part, thereby improving the structural strength of the protruding part and the anti-expansion performance.

[0016] In some embodiments, the battery monomer comprises a shell and an electrode assembly arranged in the shell; the size of the protruding part protruding from the main plate is H, and the size of the shell in the height direction is L, and H / L≥0.5.

[0017] Through the above technical solution, in the height direction, the size of the protruding part is set to be greater than half of the size of the shell of the battery monomer, so that the expansion deformation of the battery monomer can be well limited by the protruding part.

[0018] In some embodiments, H / L≥0.8.

[0019] Through the above technical solution, the protruding part can limit the expansion deformation of the battery monomer at more positions, thereby improving the anti-expansion performance of the box body.

[0020] In some embodiments, the shell comprises a shell body and an end cover covering the shell body, the end cover is located at one end of the shell body away from the main plate, H>L, or H≤L-3mm.

[0021] Through the above technical solution, the protruding part can avoid the connection part of the end cover and the shell body, thereby reducing the risk of cracking of the connection part of the end cover and the shell body due to the support of the protruding part.

[0022] In some embodiments, L-8mm≤H≤L-3mm.

[0023] By the technical scheme, the size of the protruding portion in the height direction can be set small, so as to facilitate manufacturing and reduce cost, and the expansion and deformation of the battery monomer can be well limited.

[0024] In some embodiments, an opening is formed on the main plate at a position corresponding to the protruding portion, and the limiting beam is inserted into the accommodating space through the opening.

[0025] By the technical scheme, the opening is provided, so as to facilitate insertion of the limiting beam into the accommodating space, so as to be connected and fixed with the protruding portion.

[0026] In some embodiments, the box body comprises a protective plate arranged on a side of the main plate away from the protruding portion, and the limiting beam is arranged on the protective plate.

[0027] By the technical scheme, the protective plate is provided, so as to well protect the main plate of the box body, reduce direct impact of external impact on the main plate, and affect the safety of the battery monomer. At the same time, the existence of the protective plate also provides additional support for the limiting beam, further enhances the overall structural stability of the box body, and improves the anti-expansion performance.

[0028] In some embodiments, the protective plate is connected with the limiting beam by bonding.

[0029] By the technical scheme, the protective plate is connected with the limiting beam by bonding, so as to better position and fix the limiting beam, improve the connection strength, and further improve the structural strength of the box body.

[0030] In some embodiments, the box body is an integrally formed structure.

[0031] By the technical scheme, the processing and manufacturing of the box body can be facilitated, and the overall strength of the box body can be improved, and the structural strength of the box body can be improved.

[0032] In some embodiments, the box body is in a basin-shaped structure.

[0033] By the technical scheme, the box body is provided in a basin-shaped structure, so as to facilitate manufacturing of the box body for accommodating the battery monomer, reduce the components for manufacturing the box body, and facilitate assembly of the box body.

[0034] In some embodiments, the box body is a composite material piece.

[0035] By the technical scheme, the box body uses a composite material piece, which is light in weight, high in structural strength, and good in durability.

[0036] In a second aspect, the embodiments of the present application provide a power utilization device, comprising the battery device as described in the above embodiments, and the battery device is used for storing or providing electric energy.

[0037] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0039] Figure 1 Structure diagram of a vehicle according to some embodiments of the present application;

[0040] Figure 2 Exploded structure diagram of a battery device according to some embodiments of the present application;

[0041] Figure 3 Exploded structure diagram of a battery cell according to some embodiments of the present application;

[0042] Figure 4 Perspective structure diagram of a box body according to some embodiments of the present application;

[0043] Figure 5 Structure diagram of a box body according to some embodiments of the present application; Figure 4 Structure diagram of a box body according to some embodiments of the present application;

[0044] Figure 6 Structure diagram of a box body according to some embodiments of the present application; Figure 5 Structure diagram of a box body according to some embodiments of the present application;

[0045] Figure 7 Structure diagram of a box body according to some embodiments of the present application; Figure 6 Structure diagram of a box body according to some embodiments of the present application;

[0046] Figure 8 Structure diagram of a box body according to some embodiments of the present application;

[0047] Figure 9 Structure diagram of a box body according to some embodiments of the present application;

[0048] Figure 10 Structure diagram of a box body according to some embodiments of the present application; Figure 9 Structure diagram of a box body according to some embodiments of the present application;

[0049] Figure 11 Structure diagram of a box body according to some embodiments of the present application; Figure 10 Structure diagram of a box body according to some embodiments of the present application;

[0050] Figure 12 Structure diagram of connection between frame beam and box body in some embodiments of the present application;

[0051] Figure 13 Structure diagram of connection between frame beam and box body in some embodiments of the present application;

[0052] Figure 14 Structure diagram of connection between frame beam and box body in some embodiments of the present application;

[0053] Figure 15 Structure diagram of connection between frame beam and box body in some embodiments of the present application;

[0054] Figure 16 Structure diagram of connection between frame beam and box body in some embodiments of the present application.

[0055] In the drawings, the main marks are as follows:

[0056] 11, vehicle; 111, controller; 112, motor;

[0057] 200, battery device; 20, box body; 201, first box body; 202, second box body; 2001, containing space;

[0058] 21, box body; 210, frame; 211, main body plate; 2110, opening; 2111, receiving groove; 212, protruding part; 2120, containing space; 2121, first plate body; 2122, second plate body; 213, side wall plate; 2130, containing groove; 214, first extension part; 215, second extension part; 216, folding part; 217, third extension part; 218, folded edge plate;

[0059] 22, limiting beam; 220, weight-reducing space; 23, fastener;

[0060] 24, frame beam; 2401, first receiving space; 2402, second receiving space; 2403, weight-reducing cavity; 241, outer beam; 2411, support part; 242, adaptive beam; 243, receiving part; 25, guard plate; 26, reinforcing beam; 27, thermal management component; 271, channel; 28, rivet;

[0061] 300, battery monomer; 31, electrode assembly; 311, main body part; 312, tab; 3121, positive electrode tab; 3122, negative electrode tab; 32, shell; 321, casing; 322, end cover; 3221, separator; 3201, liquid injection hole; 3202, pressure relief mechanism; 33, electrode terminal; 331, positive electrode terminal; 332, negative electrode terminal; 34, adapter sheet; 341, positive electrode adapter sheet; 342, negative electrode adapter sheet; 35, insulating film; 36, supporting plate;

[0062] X, first length direction; Y, first width direction; Z, height direction. DETAILED DESCRIPTION

[0063] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0064] 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 this application; the present specification and claims and the aforementioned description of the drawings, the terms "comprising" and "having" and any variations thereof are intended to cover not exclusively inclusive.

[0065] 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. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0066] 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 present application. The appearance 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 other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined in any suitable manner with other embodiments.

[0067] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0068] If not specifically stated, all technical features and optional technical features of the present application can be combined to form new technical solutions.

[0069] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between 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 " / " herein generally represents an "or" relationship between the associated objects.

[0070] 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). The meaning of "several" is one or more, unless otherwise explicitly specified and limited.

[0071] In the description of the embodiments of the present application, 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 indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] 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 broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0074] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical term "adjacent" means close in position. For example, A1, A2 and B three components, the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, and B is also adjacent to A2. For example, when there are a plurality of C components, the plurality of C components are C1, C2……C N , and B is adjacent to C2, and C2 is also adjacent to B.

[0075] With more and more applications of battery devices, the requirement for lightweight battery devices is also higher and higher, especially for mobile devices such as electric vehicles, ships, aircraft and other equipment, which need lightweight battery devices to reduce their load. Lightweight battery devices not only can improve the endurance of the equipment, but also can reduce energy consumption, and are more in line with the environmental protection trend.

[0076] When the battery device is manufactured, the battery cell needs to be installed in the box body to support and protect the battery cell. However, the battery cell may swell and deform during charging and discharging. In order to inhibit the swelling and deformation of the battery cell, a limiting beam is usually arranged in the box body to resist the battery cell to limit its swelling and deformation.

[0077] Currently, the limiting beam is directly fixed on the bottom plate of the box body, such as the limiting beam is bonded or directly fixed on the bottom plate by fasteners when the box body is made of non-metallic materials. When the limiting beam and the bottom plate are made of different materials, the limiting beam is also directly fixed on the bottom plate by fasteners. However, since the limiting beam resists the swelling and deformation of the battery cell, it will be subjected to the resisting force of the battery cell, and the moment of the resisting force on the limiting beam is greater when it is close to the bottom plate. This will make the connection between the limiting beam and the bottom plate deform or loosen, resulting in poor anti-swelling performance of the box body.

[0078] Based on the above considerations, in order to improve the problem that the limiting beam is directly installed on the bottom plate in the related art, resulting in poor anti-swelling performance of the box body, the embodiments of the present application provide a battery device. By arranging a protruding portion on the main plate, the structural strength of the main plate can be increased. A receiving space is formed in the protruding portion, and the limiting beam is installed in the receiving space. The structural strength of the protruding portion can be supported and strengthened by the limiting beam. Then the limiting beam is fixedly connected with the main plate, and the swelling and deformation of the battery cell is limited by the cooperation of the limiting beam and the protruding portion. The moment of the force of the battery cell on the limiting beam is dispersed by the protruding portion, which reduces the influence of the moment on the contact between the limiting beam and the main plate. The overall structure formed by the protruding portion and the limiting beam can better resist the battery cell to inhibit the swelling and deformation of the battery cell, thereby improving the anti-swelling performance of the box body.

[0079] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0080] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0081] The battery cell in the embodiments of the present application comprises an electrode assembly. The electrode assembly, also known as bare cell, is a component for storing and releasing electric energy. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly mainly works by moving metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the part of the positive electrode current collector which is not coated with the positive electrode active material layer protrudes from the part which is coated with the positive electrode active material layer, the part which is not coated with the positive electrode active material layer serves as a positive electrode tab, or a metal conductor is welded on the positive electrode current collector and led out as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the part of the negative electrode current collector which is not coated with the negative electrode active material layer protrudes from the part which is coated with the negative electrode active material layer, the part which is not coated with the negative electrode active material layer serves as a negative electrode tab, or a metal conductor is welded on the negative electrode current collector and led out as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that the melting does not occur to a certain extent when passing through a large current, the number of positive electrode tabs is multiple and they are stacked together, and the number of negative electrode tabs is multiple and they are stacked together. Understandably, in the electrode assembly, the number of positive electrode tabs can be one, and the number of negative electrode tabs can also be one. That is to say, two groups of tabs are provided on the electrode assembly, each group comprises at least one tab, and one group of tabs is a positive electrode tab and the other group of tabs is a negative electrode tab.

[0082] The electrode assembly can be a winding type structure or a stacking type structure. The embodiments of the present application are not limited thereto. In the winding type structure, the tabs are welded to the current collectors, and then arranged in the order of positive electrode sheet-separator-negative electrode sheet-separator, and then wound to form a cylindrical or square cell. In the stacking type structure, the tabs are led out from the current collectors, and then the positive electrode sheet, the negative electrode sheet and the separator are arranged in the order of positive electrode sheet-separator-negative electrode sheet-separator, and then stacked together to form a stacked cell. The separator can be cut and directly stacked with the separator sheet, or the separator is not cut but folded in Z shape for stacking. The material of the separator can be PP (Polypropylene) or PE (Polyethylene), etc. The separator is an insulating film arranged between the positive electrode sheet and the negative electrode sheet, and its main function is to isolate the positive electrode and the negative electrode and prevent the electrons in the battery from freely passing through to prevent short circuit, while allowing the ions in the electrolyte to freely pass between the positive electrode and the negative electrode to form a loop. The positive electrode sheet and the negative electrode sheet are collectively referred to as electrode sheets. The positive electrode tab and the negative electrode tab are collectively referred to as tabs.

[0083] The battery cell usually contains a certain amount of gas inside. When the battery cell is charged or discharged, the solution in the electrolyte will undergo a gas generation or absorption reaction. The generation of these gases will cause the internal gas pressure of the battery cell to rise, causing the battery cell to swell and deform. During the charging or discharging process of the battery cell, the positive and negative electrode materials will undergo chemical reactions to form new compounds. These chemical reactions are accompanied by volume changes, which cause the volume of the materials inside the battery cell to change, causing the battery to swell and deform. When the battery cell is overcharged or over-discharged, it will cause the chemical reaction inside the battery cell to get out of control, generating too much gas or causing the structure of the electrode material to be destroyed, which in turn causes the battery cell to swell and deform. Charging or discharging the battery cell in a high-temperature environment will accelerate the internal chemical reaction, increase the generation of gas and the change in volume. High temperature will also cause the internal substances of the battery cell to swell, which will also cause the battery cell to swell and deform.

[0084] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0085] For convenience of description, an electric device is provided in an embodiment of the present application, which is taken as an example of a vehicle.

[0086] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 11 is provided for some embodiments of the present application. The vehicle 11 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle 11 is internally provided with a battery device 200, which can be arranged at the bottom, head or tail of the vehicle 11. The battery device 200 can be used for power supply of the vehicle 11, for example, the battery device 200 can be used as the operating power supply of the vehicle 11. The vehicle 11 can also include a controller 111 and a motor 112, and the controller 111 is used to control the battery device 200 to supply power to the motor 112, for example, for the working power demand of the vehicle 11 during starting, navigation and driving.

[0087] In some embodiments, the battery device 200 can not only be used as the operating power supply of the vehicle 11, but also be used as the driving power supply of the vehicle 11, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 11.

[0088] Please refer to Figure 2The embodiments of the present application provide a battery apparatus 200. The battery apparatus 200 can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 300 connected in series, in parallel, or in a mixed connection through a busbar.

[0089] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 300.

[0090] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells 300 into a single module. As an example, the battery module can be formed by bundling a plurality of battery cells 300 with a cable tie.

[0091] In some embodiments, the battery apparatus 200 can be a battery pack including a box 20 and one or more battery cell assemblies housed in the box 20.

[0092] As an example, the battery cell assembly can be a battery module, which can be housed in the box 20 by fixing the battery module in the box 20.

[0093] As an example, the battery cell assembly can also be housed in the box 20 by directly fixing a plurality of battery cells 300 in the box 20.

[0094] In some embodiments, the box 20 can include a first box 201 and a second box 202, which are fastened to each other so that an enclosed space is formed inside the box 20 to house the battery cells 300. Here, the enclosed space means covered or closed, which can be sealed or unsealed. The second box 202 can be a hollow structure with one end open, and the first box 201 can be a plate structure, which is fitted to the open side of the second box 202, and can be a top cover or a bottom plate of the box 20. The first box 201 can be a hollow structure with one end open, and the second box 202 can be a plate structure, which is fitted to the open side of the first box 201, and can be a top cover or a bottom plate of the box 20. The first box 201 and the second box 202 can also be hollow structures with one side open, and the open side of the first box 201 is fitted to the open side of the second box 202.

[0095] In some embodiments, the case 20 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to opposite sides of the frame, so that an enclosed space is formed inside the case 20 to accommodate the battery cell 300. The frame refers to a partial structure forming the peripheral side wall of the case 20, the top cover refers to a plate-shaped structure forming the top of the case 20, and the bottom plate refers to a plate-shaped structure forming the bottom of the case 20.

[0096] In some embodiments, the case 20 can be part of the chassis structure of the vehicle. For example, part of the case 20 can become at least part of the floor of the vehicle, or part of the case 20 can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0097] Referring to Figure 2 , the case 20 has a length direction, a width direction, and a height direction, as Figure 2 indicated by reference numeral X, the first length direction, indicated by reference numeral Y, the first width direction, and indicated by reference numeral Z, the height direction. The first length direction X is the length direction of the case 20, the first width direction is the width direction of the case 20, and the height direction Z is the height direction of the case 20.

[0098] Referring to Figure 3 , the battery cell 300 includes one or more electrode assemblies 31, which are also referred to as bare cells, which are components that store and release electrical energy. In the case of multiple electrode assemblies 31, the multiple electrode assemblies 31 are connected in parallel.

[0099] In some embodiments, the electrode assembly 31 includes a main body portion 311 having a tab 312 provided thereon. The main body portion 311 is the main part of the electrode assembly 31. The tab 312 is a current flow path for connecting an external circuit to allow the main body portion 311 to charge and discharge. The tab 312 includes a positive tab 3121 and a negative tab 3122, which are respectively connected to the positive and negative terminals of the external circuit. The positive tab 3121 and the negative tab 3122 can be located on the same side of the main body portion 311, or can be located on different sides of the main body portion 311, such as on opposite sides of the main body portion 311.

[0100] In some embodiments, the battery cell 300 includes a housing 32, which is a structure for providing a space to accommodate the electrode assembly 31 and serving to support and protect the electrode assembly 31.

[0101] In some embodiments, the housing 32 includes a case 321 and an end cover 322, and the electrode assembly 31 is mounted in the case 321, and the end cover 322 is provided on the case 321.

[0102] The end cover 322 refers to a component that covers the opening of the shell 321 to isolate the internal environment of the battery monomer 300 from the external environment. The shape of the end cover 322 can be adapted to the shape of the shell 321 to fit on the shell 321. Optionally, the end cover 322 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 322 is not easily deformed when subjected to extrusion collision, so that the battery monomer 300 can have higher structural strength, and the reliability can also be improved. The material of the end cover 322 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in the present application.

[0103] The shell 321 is a component for fitting the end cover 322 to form the internal environment of the battery monomer 300, wherein the formed internal environment can be used to accommodate the electrode assembly 31, electrolyte and other components. The shell 321 can be various shapes and various sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell 321 can be determined according to the specific shape and size of the battery monomer 300. The material of the shell 321 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in the present application.

[0104] In some embodiments, the end cover 322 is provided with a separator 3221, which can be used to isolate the electrical connection components in the shell 321 from the end cover 322 to reduce the risk of short circuit. For example, the separator 3221 can be plastic, rubber, etc.

[0105] In some embodiments, the outer shell 32 is provided with a liquid injection hole 3201. The liquid injection hole 3201 refers to a hole structure for injecting electrolyte into the outer shell 32. After the electrode assembly 31 is made, the electrode assembly 31 needs to be installed in the shell 321 and the electrolyte is injected to make the electrode assembly 31 immersed in the electrolyte, so that the electrode assembly 31 can fully absorb the electrolyte. The electrolyte can provide part of the active ions, which are used as conductive ions in the charging and discharging process; in addition, the electrolyte also provides an ion channel, or called carrier, so that the ions can move freely in it to realize the electrical conduction between the electrode sheets. The outer shell 32 is provided with the liquid injection hole 3201 to add electrolyte to the outer shell 32.

[0106] As an example, the liquid injection hole 3201 can be provided on the shell 321. Of course, the liquid injection hole 3201 can also be provided on the end cover 322.

[0107] In some embodiments, the outer shell 32 is provided with a pressure relief mechanism 3202, which is used to release the internal pressure when the internal pressure or temperature of the battery monomer 300 reaches a threshold value. The pressure relief mechanism 3202 can be a structure such as an explosion-proof valve or an explosion-proof sheet provided on the outer shell 32.

[0108] In some embodiments, the battery cell 300 comprises electrode terminals 33 provided on the shell 32, the electrode terminals 33 being connected with the tab 312 of the electrode assembly 31. The electrode terminal 33 refers to a conductive member provided on the shell 32, the electrode terminal 33 being connected with the tab 312 of the electrode assembly 31 to output the electric energy of the battery cell 300 or charge the battery cell 300. The electrode terminal 33 of the battery cell 300 is generally two, the two electrode terminals 33 being a positive electrode terminal 331 and a negative electrode terminal 332 respectively, the positive electrode terminal 331 being connected with the positive electrode tab 3121 of the electrode assembly 31, and the negative electrode terminal 332 being connected with the negative electrode tab 3122 of the electrode assembly 31.

[0109] In some embodiments, the battery cell 300 further comprises adapter tabs 34, the adapter tabs 34 being generally two corresponding to the two electrode terminals 33 respectively, each tab 312 being connected with the corresponding electrode terminal 33 through the adapter tab 34 to facilitate the connection of the tab 312 and the electrode terminal 33, and the connection being more stable. The two adapter tabs 34 are a positive electrode adapter tab 341 and a negative electrode adapter tab 342 respectively, the positive electrode adapter tab 341 connecting the positive electrode tab 3121 and the positive electrode terminal 331, and the negative electrode adapter tab 342 connecting the negative electrode tab 3122 and the negative electrode terminal 332.

[0110] In some embodiments, the battery cell 300 comprises an insulating film 35, the insulating film 35 being provided around the electrode assembly 31 to bind the electrode assembly 31, thereby facilitating the assembly of the electrode assembly 31 into the shell 32. Moreover, the insulating film 35 can also protect the electrode assembly 31. The insulating film 35 can be made of polypropylene, polyethylene or other insulating materials to well insulate and isolate the electrode assembly 31 from the shell 32, thereby reducing the risk of internal short circuit of the battery cell 300.

[0111] In some embodiments, the battery cell 300 further comprises a support plate 36 installed in the shell 32 to support the electrode assembly 31. The provision of the support plate 36 can better support the electrode assembly 31 and reduce the deformation of the edge of the electrode assembly 31 due to the round corners of the edge of the shell 32. The support plate 36 can be made of ceramic, plastic, silica gel or other materials.

[0112] Please refer to Figures 3 to 8According to some embodiments of the present application, the battery device 200 is provided, which comprises a box 20 having a containing space 2001 and a battery cell 300 installed in the containing space 2001; the box 20 comprises a box body 21 and a limiting beam 22; the box body 21 comprises a body plate 211 and a protruding part 212 connected to the body plate 211, the battery cell 300 is supported on the body plate 211, the protruding part 212 is arranged to extend from the body plate 211 to the side of the body plate 211 along the height direction Z of the box 20, and the protruding part 212 is formed with a containing space 2120, and the limiting beam 22 is installed in the containing space 2120.

[0113] The box 20 refers to a container structure for containing the battery cell 300. The containing space 2001 refers to the space inside the box 20 for installing the battery cell 300.

[0114] The battery cell 300 refers to the smallest unit for storing and releasing electric energy in the battery device 200. The battery cell 300 is installed in the containing space 2001 of the box 20 and can be supported and protected by the box 20.

[0115] The box body 21 refers to a structure for forming part of the structure of the box 20. The box body 21 can be made of non-metallic materials, and of course the box body 21 can also be made of metal materials such as steel and aluminum. The box body 21 is made of non-metallic materials, which is light in weight and strong in corrosion resistance, and can effectively improve the structural safety and durability of the box body 21. The non-metallic materials can be made of plastics, composite materials, etc. The composite material refers to a material composed of two or more different materials, and the composite material is usually a material formed by combining resin and reinforcing material. The resin material is usually used as the base material, such as epoxy resin, polyester resin or vinyl ester resin, etc., to improve the adhesion and protection. The reinforcing material can use fiber materials, particle materials or sheet materials, etc. to improve the strength and stiffness. The fiber material can be carbon fiber, glass fiber or aramid fiber, etc. The particle material can use silicon carbide particles and other materials. The sheet material can use mica sheet and other materials. Carbon fiber composite material, glass fiber composite material or aramid fiber composite material, etc. can be referred to as fiber composite material, which is usually wrapped with resin on the fiber, then woven into cloth or strips, and then hot-pressed into a corresponding shape of structural part. The box body 21 is made of composite material, which is light in weight and strong in corrosion resistance. The box body 21 is made of fiber composite material, which is light in weight, high in structural strength and strong in corrosion resistance.

[0116] The limiting beam 22 refers to a beam or column structure in the box body 20 used to hold the battery monomer 300 to limit the expansion and deformation of the battery monomer 300. The length and shape of the limiting beam 22 can be designed according to actual needs to adapt to the needs of battery devices 200 of different sizes. The limiting beam 22 can be made of metal materials such as steel and aluminum alloy. Of course, in some embodiments, the limiting beam 22 can also be made of composite materials such as carbon fiber and glass fiber to further reduce weight and improve strength. As an example, the length direction of the limiting beam 22 can be consistent with the first length direction X. As an example, the length direction of the limiting beam 22 can be perpendicular to the first length direction X. As an example, the length direction of the limiting beam 22 can also be inclined to the first length direction X. It can be set according to the installation position and use demand of the limiting beam 22.

[0117] The main plate 211 is the main part structure of the box body 21, and the main plate 211 is the structure of the main plate part constituting the top or bottom of the box body 20 in the height direction Z.

[0118] The protruding part 212 refers to the part structure protruding along the height direction Z on the main plate 211. The protruding part 212 is provided on the main plate 211 to increase the structural strength. As an example, the protruding part 212 as a whole can be provided in a strip shape, and the length direction thereof can be set to be consistent with the length direction of the limiting beam 22, so as to be well connected with the limiting beam 22.

[0119] As an example, the protruding part 212 can be provided in a rectangular shape, an L shape, a right trapezoidal shape, a right triangular shape, etc. in the cross section perpendicular to the length direction thereof. The right trapezoidal shape refers to a trapezoidal shape with a right angle between one waist and the bottom side. The right triangular shape refers to a triangular shape with a right angle.

[0120] The accommodation space 2120 refers to the space formed by the protruding part 212. As an example, in the case that the cross section of the protruding part 212 is a polygon, the accommodation space 2120 can be the space defined inside the protruding part 212. As an example, in the case that the cross section of the protruding part 212 is an L shape, the accommodation space 2120 is the internal space of the groove structure formed by the protruding part 212 and the main plate 211.

[0121] The battery monomer 300 supported on the main plate 211 refers to that the battery monomer 300 can be directly installed on the main plate 211 and supported by the main plate 211; or the battery monomer 300 is indirectly installed on the main plate 211 and indirectly supported by the main plate 211, such as that a cold plate or the like can be provided between the main plate 211 and the battery monomer 300.

[0122] The limiting beam 22 is installed in the accommodating space 2120, that is, the limiting beam 22 is entirely or mostly arranged in the accommodating space 2120, so as to fix the limiting beam 22 in the accommodating space 2120. The limiting beam 22 is installed in the accommodating space 2120, so as to be fixedly connected with the convex portion 212, and the convex portion 212 is connected with the main plate 211, and then the limiting beam 22 is indirectly connected with the main plate 211.

[0123] Since the limiting beam 22 is installed in the accommodating space 2120 formed by the convex portion 212, when the battery monomer 300 is supported on the main plate 211, the limiting beam 22 and the convex portion 212 jointly resist the battery monomer 300, so as to limit the swelling deformation of the battery monomer 300. The moment of force formed by the swelling deformation of the battery monomer 300 on the limiting beam 22 and the convex portion 212 is dispersed by the convex portion 212, so as to reduce the influence of the moment of force on the contact position of the limiting beam 22 and the main plate 211. Therefore, the overall structure formed by the convex portion 212 and the limiting beam 22 can better resist the battery monomer 300, so as to inhibit the swelling deformation of the battery monomer 300, and improve the swelling resistance of the box body 20.

[0124] In the technical scheme of the embodiment, the structure strength of the main plate 211 is increased by arranging the convex portion 212 on the main plate 211. The structure strength of the convex portion 212 is strengthened by arranging the limiting beam 22 in the accommodating space 2120 formed by the convex portion 212, and installing the limiting beam 22 in the accommodating space 2120. Then, the limiting beam 22 is fixedly connected with the main plate 211, and the swelling deformation of the battery monomer 300 is limited by the cooperation of the limiting beam 22 and the convex portion 212, so as to improve the swelling resistance of the box body 20.

[0125] In some embodiments, referring to Figures 4 to 8 The convex portion 212 includes a first plate body 2121 and a second plate body 2122. The first plate body 2121 is arranged on one side of the main plate 211 along the height direction Z of the box body 20. The second plate body 2122 is connected between the first plate body 2121 and the main plate 211. The first plate body 2121 is fixedly connected with the end face of the limiting beam 22 away from the main plate 211.

[0126] The first plate body 2121 refers to a part of the structure of the convex portion 212 arranged on the end of the limiting beam 22 away from the main plate 211. The second plate body 2122 refers to a part of the structure of the convex portion 212 connected between the first plate body 2121 and the main plate 211.

[0127] The first plate body 2121 is fixedly connected with the end face of the limiting beam 22 away from the main plate 211, that is, the first plate body 2121 is fixedly connected with the limiting beam 22, so as to facilitate the installation and fixation of the limiting beam 22, and also to make the limiting beam 22 well support the first plate body 2121 and the second plate body 2122.

[0128] By the above technical solution, the first plate body 2121 is arranged to be connected and fixed with the limiting beam 22, the second plate body 2122 is arranged, the first plate body 2121 can be conveniently connected with the main plate 211, the first plate body 2121 and the second plate body 2122 form the protruding part 212, the structure is simple and convenient for manufacturing, and in addition, the second plate body 2122 can directly abut against the battery monomer 300, so that the anti-expansion performance is improved.

[0129] In some embodiments, referring to Figure 8 , the first plate body 2121 is fixedly connected with the limiting beam 22 through the fastener 23.

[0130] The fastener 23 refers to a structural part for fixedly connecting two or more objects. As an example, the fastener 23 can be a bolt, a rivet, a screw, a pin, etc. The limiting beam 22 and the first plate body 2121 are fixedly connected through the fastener 23, and the connection is stable.

[0131] Through the above technical solution, the first plate body 2121 and the limiting beam 22 can be firmly fixed, and the connection strength is improved.

[0132] In some embodiments, the first plate body 2121 and the limiting beam 22 can also be connected by adhesion. In some embodiments, a clasp can be arranged on one of the first plate body 2121 and the limiting beam 22, and a buckle can be arranged on the other one of the first plate body 2121 and the limiting beam 22, the first plate body 2121 and the limiting beam 22 are fixedly connected through the cooperation of the clasp and the buckle.

[0133] In some embodiments, referring to Figures 4 to 8 , the limiting beam 22 is provided with the second plate body 2122 at least on one side close to the battery monomer 300.

[0134] The side of the limiting beam 22 close to the battery monomer 300 refers to the side with the smallest distance between the limiting beam 22 and the battery monomer 300 when the battery monomer 300 is installed on the main plate 211.

[0135] Through the above technical solution, the second plate body 2122 is arranged on the side of the limiting beam 22 close to the battery monomer 300, the second plate body 2122 is abutted by the limiting beam 22, and the battery monomer 300 is abutted by the second plate body 2122, so that the expansion deformation force of the battery monomer 300 does not directly act on the limiting beam 22, the risk of deformation or damage of the contact part of the limiting beam 22 and the main plate 211 is reduced, and the anti-expansion performance of the box body 20 is improved.

[0136] In some embodiments, referring to Figures 4 to 8 , the first plate body 2121 is provided with the second plate body 2122 on opposite sides.

[0137] The second plate body 2122 is arranged on the opposite side of the first plate body 2121, that is, the second plate body 2122 is arranged on the opposite side of the first plate body 2121 along the thickness direction of the limiting beam 22. In other words, the opposite side of the first plate body 2121 is connected to the main plate 211 through the second plate body 2122, which can better support the first plate body 2121 and improve the structural strength of the box body 21. Moreover, the second plate body 2122 is arranged on the opposite side of the first plate body 2121, which can better connect the two second plate bodies 2122 with the limiting beam 22 and cooperate to resist the battery monomer 300, so as to better inhibit the swelling deformation of the battery monomer 300 and improve the anti-swelling performance.

[0138] According to the above technical solution, the second plate body 2122 is arranged on the opposite side of the first plate body 2121, so that after the limiting beam 22 is installed, the second plate body 2122 on the two sides of the first plate body 2121 is respectively arranged on the opposite side of the limiting beam 22, which can stably support the limiting beam 22 and improve the connection strength between the limiting beam 22 and the box body 21, thereby improving the connection strength between the limiting beam 22 and the box body 21. Moreover, the second plate bodies 2122 on the two sides of the limiting beam 22 can cooperate to bear the swelling force of the battery monomer 300, thereby improving the anti-swelling performance of the box body 20.

[0139] In some embodiments, referring to Figure 10 The second plate body 2122 can also be arranged on only one side of the first plate body 2121, that is, the second plate body 2122 is arranged on one side of the first plate body 2121 and connected to the main plate 211. For example, the second plate body 2122 can be arranged on the side of the first plate body 2121 close to the battery monomer 300. For example, the second plate body 2122 can be arranged on the side of the first plate body 2121 away from the battery monomer 300.

[0140] In some embodiments, referring to Figures 7 to 8 The limiting beam 22 is connected to the inner surface of the protruding portion 212 by bonding.

[0141] The inner surface of the protruding portion 212 refers to the surface of the side wall of the protruding portion 212 close to the accommodation space 2120, that is, the surface of the protruding portion 212 close to the accommodation space 2120.

[0142] The limiting beam 22 is connected to the inner surface of the protruding portion 212 by bonding, that is, the limiting beam 22 is connected to the inner surface of the protruding portion 212 by a bonding agent such as double-sided tape, structural adhesive, curing adhesive, etc. The limiting beam 22 is connected to the inner surface of the protruding portion 212 by bonding to achieve the connection between the limiting beam 22 and the protruding portion 212.

[0143] The limiting beam 22 is connected to the inner surface of the protruding portion 212 by bonding, so as to facilitate the installation and fixation of the limiting beam 22, and the limiting beam 22 can more stably support the protruding portion 212, the structural strength of the protruding portion 212 is improved, and the anti-expansion performance is improved.

[0144] In some embodiments, referring to Figures 7 to 8 , the limiting beam 22 is connected to the first plate body 2121 by bonding.

[0145] The limiting beam 22 is connected to the first plate body 2121 by bonding, that is, one end surface of the limiting beam 22 close to the first plate body 2121 is connected to the corresponding side surface of the first plate body 2121 by an adhesive, so as to improve the connection strength of the limiting beam 22 and the first plate body 2121, and the limiting beam 22 can be positioned during assembly, facilitating the assembly of the limiting beam 22.

[0146] The limiting beam 22 can be connected to the first plate body 2121 by an adhesive such as double-sided tape, structural adhesive, or curing adhesive.

[0147] The limiting beam 22 is connected to the first plate body 2121 by bonding, so as to facilitate the installation and fixation of the limiting beam 22 and the connection of the limiting beam 22.

[0148] In some embodiments, referring to Figures 7 to 8 , the limiting beam 22 is connected to the second plate body 2122 by bonding.

[0149] The limiting beam 22 is connected to the second plate body 2122 by bonding, that is, the side surface of the limiting beam 22 close to the second plate body 2122 is connected to the corresponding side surface of the second plate body 2122 by an adhesive, so as to improve the connection strength of the limiting beam 22 and the second plate body 2122, and the limiting beam 22 can be positioned during assembly, facilitating the assembly of the limiting beam 22.

[0150] The limiting beam 22 can be connected to the second plate body 2122 by an adhesive such as double-sided tape, structural adhesive, or curing adhesive.

[0151] The limiting beam 22 is connected to the second plate body 2122 by bonding, so as to facilitate the installation and fixation of the limiting beam 22, improve the connection strength of the limiting beam 22 and the second plate body 2122, improve the connection strength of the limiting beam 22 and the box body 21, and further improve the connection strength of the limiting beam 22 and the box body 21, and improve the anti-expansion performance.

[0152] In some embodiments, the limiting beam 22 can be connected to the first plate body 2121 by bonding. In an embodiment, the limiting beam 22 can be connected to the second plate body 2122 by bonding. In some embodiments, the limiting beam 22 can be connected to both the first plate body 2121 and the second plate body 2122 by bonding.

[0153] In some embodiments, referring to Figure 3 、 Figures 7 to 8 , the battery cell 300 includes a shell 32 and an electrode assembly 31 disposed in the shell 32; the protruding part 212 protrudes from the main plate 211 by a dimension H, and the shell 32 has a dimension L in the height direction Z, and H / L≥0.5.

[0154] The shell 32 refers to a structure for providing a containing space to contain the electrode assembly 31, and plays a supporting and protecting role for the electrode assembly 31. The electrode assembly 31, also known as a bare cell, is a component for storing and releasing electric energy.

[0155] The dimension H of the protruding part 212 protruding from the main plate 211 refers to the dimension H of the protruding part 212 in the height direction Z. H / L≥0.5 means that the dimension H of the protruding part 212 is greater than or equal to half of the dimension of the shell 32 of the battery cell 300, that is, the dimension H of the protruding part 212 is more than half of the height of the battery cell 300.

[0156] Through the above technical solution, in the height direction Z, the dimension H of the protruding part 212 is set to be greater than half of the dimension of the shell 32 of the battery cell 300, so that the expansion deformation of the battery cell 300 can be well limited by the protruding part 212.

[0157] In some embodiments, referring to Figure 3 、 Figures 7 to 8 , H / L≥0.8.

[0158] H / L≥0.8 means that the dimension H of the protruding part 212 is greater than or equal to 80% of the dimension of the shell 32 of the battery cell 300.

[0159] Through the above technical solution, the protruding part 212 can limit the expansion deformation of the battery cell 300 in more positions, so as to improve the anti-expansion performance of the box body 20.

[0160] In some embodiments, referring to Figure 3 、 Figures 7 to 8 , the shell 32 includes a shell body 321 and an end cover 322 covering the shell body 321, the end cover 322 is located at one end of the shell body 321 away from the main plate 211, and H>L or H≤L-3mm.

[0161] The shell 321 refers to a component for fitting the end cover 322 to form an internal environment of the battery cell 300, wherein the formed internal environment can be used to accommodate the electrode assembly 31, the electrolyte and other components.

[0162] The end cover 322 refers to a component covering the opening of the shell 321 to isolate the internal environment of the battery cell 300 from the external environment.

[0163] The end cover 322 located at the end of the shell 321 away from the main plate 211 refers to the end cover 322 located at the end of the protruding part 212 away from the main plate 211. When the end cover 322 is located at the end of the shell 321 away from the main plate 211, the connection between the end cover 322 and the shell 321 is close to the end of the protruding part 212 away from the main plate 211.

[0164] Since the protruding part 212 cooperates with the limiting beam 22 to limit the expansion deformation of the battery cell 300, H > L, that is, the dimension H of the protruding part 212 along the height direction Z is set to be greater than the dimension L of the shell 32 of the battery cell 300 along the height direction Z, so that the protruding part 212 and the limiting beam 22 form a whole to resist the entire side surface of the battery cell 300, thereby reducing the risk of cracking at the connection between the end cover 322 and the shell 321. H≤L-3mm, that is, the dimension H of the protruding part 212 along the height direction Z is set to be less than the dimension L of the shell 32 along the height direction Z by more than 3mm, such as the dimension H of the protruding part 212 along the height direction Z is less than the dimension L of the shell 32 along the height direction Z by 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, etc., so that the end of the protruding part 212 away from the main plate 211 is located at the side close to the main plate 211 at the connection between the end cover 322 and the shell 321, so that the protruding part 212 and the limiting beam 22 as a whole resist the position of the expansion deformation of the battery cell 300 away from the connection between the end cover 322 and the shell 321, thereby reducing the risk of cracking at the connection between the end cover 322 and the shell 321.

[0165] Through the above technical solution, the protruding part 212 can be avoided from the connection between the end cover 322 and the shell 321, so as to reduce the risk of cracking at the connection between the end cover 322 and the shell 321 due to the resistance of the protruding part 212.

[0166] In some embodiments, please refer to Figures 7 to 8 、 Figures 7 to 8 L-8mm≤H≤L-3mm, that is, the distance from the end of the protruding part 212 away from the main plate 211 to the end of the shell 32 where the end cover 322 is located is greater than or equal to 8mm and less than or equal to 3mm.

[0167] By the technical solution, the size H of the protruding portion 212 in the height direction Z can be set small to facilitate manufacturing and reduce cost, and the battery cell 300 can be well resisted to limit swelling and deformation of the battery cell 300.

[0168] In some embodiments, referring to Figure 8 An opening 2110 is formed on the main plate 211 at a position corresponding to the protruding portion 212 to allow the limiting beam 22 to be inserted into the accommodation space 2120.

[0169] The opening 2110 refers to a through structure formed on the main plate 211. The opening 2110 is formed on the main plate 211 at a position corresponding to the protruding portion 212, which means that the opening 2110 is located on the main plate 211 and in the area covered by the protruding portion 212. The shape and size of the opening 2110 can be set according to the size and shape of the limiting beam 22.

[0170] The opening 2110 is provided to allow the limiting beam 22 to be inserted into the accommodation space 2120 through the opening 2110 to facilitate installation and fixation of the limiting beam 22. In addition, the opening 2110 is also provided to facilitate processing and manufacturing of the protruding portion 212.

[0171] By the technical solution, the opening 2110 is provided to facilitate insertion of the limiting beam 22 into the accommodation space 2120 to facilitate connection and fixation of the limiting beam 22 with the protruding portion 212.

[0172] In some embodiments, referring to Figure 8 The size of the opening 2110 in the thickness direction of the limiting beam 22 is adapted to the size of the limiting beam 22.

[0173] The size of the opening 2110 in the thickness direction of the limiting beam 22 refers to the width of the opening 2110.

[0174] The size of the limiting beam 22 in the thickness direction of the limiting beam 22 refers to the thickness of the limiting beam 22.

[0175] By the technical solution, the limiting beam 22 can be inserted from the opening 2110 in the direction of the protruding portion 212 to facilitate assembly of the limiting beam 22, and the limiting beam 22 can be positioned in the thickness direction of the limiting beam 22 by the side wall of the opening 2110.

[0176] In some embodiments, the opening 2110 can not be provided on the main plate 211, and the limiting beam 22 can be directly supported on the main plate 211. For example, when the box main body 21 is manufactured, the limiting beam 22 can be directly embedded into the accommodation space 2120 formed in the protruding portion 212.

[0177] In some embodiments, referring to Figure 8The box body 20 comprises a protective plate 25 arranged on the main plate 211 away from the protruding portion 212, and the limiting beam 22 is arranged on the protective plate 25.

[0178] The protective plate 25 refers to a plate member for protecting the side of the main plate 211 away from the protruding portion 212. The protective plate 25 can be made of metal materials such as steel and aluminum alloy, or can be made of composite materials such as carbon fiber and glass fiber.

[0179] The limiting beam 22 is arranged on the protective plate 25, that is, the end of the limiting beam 22 away from the limiting beam 22 is in contact or abuts against the protective plate 25.

[0180] Through the above technical solution, the protective plate 25 is arranged to protect the main plate 211 of the box body 20, reduce the direct impact of external impact on the main plate 211, and affect the safety of the battery monomer 300. At the same time, the existence of the protective plate 25 also provides additional support for the limiting beam 22, further enhances the overall structural stability of the box body 20, and improves the anti-expansion performance.

[0181] In some embodiments, referring to Figure 2 The protective plate 25 is arranged in a spaced manner with the main plate 211, and in the case that the box body 20 is subjected to external impact, the protective plate 25 can have a larger deformation amount to reduce the impact on the main plate 211, thereby effectively buffering the external force and protecting the safety of the main plate 211 and the battery monomer 300.

[0182] In some embodiments, the protective plate 25 is connected to the limiting beam 22 by adhesion.

[0183] The protective plate 25 is connected to the limiting beam 22 by adhesion, that is, the protective plate 25 and the end face of the end of the limiting beam 22 away from the limiting beam 22 are connected by an adhesive to improve the connection strength between the limiting beam 22 and the protective plate 25.

[0184] The limiting beam 22 can be connected to the protective plate 25 by adhesion of double-sided adhesive, structural adhesive, curing adhesive, etc.

[0185] Through the above technical solution, the protective plate 25 is connected to the limiting beam 22 by adhesion, which can better position and fix the limiting beam 22, improve the connection strength, and further improve the structural strength of the box body 20.

[0186] In some embodiments, referring to Figure 3 The limiting beam 22 is provided with a weight-reducing space 220, and the weight-reducing space 220 extends along the length direction of the limiting beam 22.

[0187] The weight-reducing space 220 refers to a cavity structure arranged on the limiting beam 22 to reduce the weight of the limiting beam 22. As an example, the weight-reducing space 220 can be a hole structure arranged on the limiting beam 22, or a slot structure arranged on the limiting beam 22.

[0188] The weight-reducing space 220 is arranged along the length direction of the limiting beam 22, and the volume of the weight-reducing space 220 can be made larger to better reduce the weight of the limiting beam 22.

[0189] In some embodiments, the limiting beam 22 can adopt a profile structure to facilitate processing and manufacturing, and to facilitate the formation of the weight-reducing space 220 in the limiting beam 22.

[0190] By the above technical solutions, the weight of the limiting beam 22 can be reduced, and the weight of the box body 20 can be reduced. The weight-reducing space 220 is arranged along the length direction of the limiting beam 22, which facilitates the processing and manufacturing of the limiting beam 22 and the weight-reducing space 220 thereon.

[0191] In some embodiments, the limiting beam 22 can be cast in a structure, and the weight-reducing space 220 can be processed and manufactured thereon. In some embodiments, the limiting beam 22 can also be made of a rolled structure to form the weight-reducing space 220 therein. In some embodiments, the limiting beam 22 can also be made of a forged structure.

[0192] In some embodiments, the box body 20 can be provided with one or more limiting beams 22. In the case of multiple limiting beams 22, the multiple limiting beams 22 can be arranged in parallel. Of course, the two adjacent limiting beams 22 can also be arranged obliquely, and the specific arrangement can be arranged as needed. Multiple refers to two or more.

[0193] In some embodiments, referring to Figure 2 and Figure 4 , the box body 20 includes a reinforcing beam 26, which is installed inside the box body 20 to enhance the structural stability. The reinforcing beam 26 refers to a beam column structure arranged inside the box body 20 to increase the structural strength. The reinforcing beam 26 can be made of various materials, such as metal or composite material, which can be selected according to actual needs.

[0194] In some embodiments, the length direction of the reinforcing beam 26 can be consistent with the first length direction X. In some embodiments, the length direction of the reinforcing beam 26 can be perpendicular to the first length direction X. In some embodiments, the length direction of the reinforcing beam 26 can also be inclined to the first length direction X.

[0195] In some embodiments, referring to Figure 9 , Figures 9 to 12 and Figures 9 to 12 , the box body 21 can serve as the first box body 201 of the box body 20. Of course, the box body 21 can also serve as the second box body 202 of the box body 20.

[0196] In some embodiments, referring to Figures 4 to 8The battery device 200 comprises a heat management component 27 which is installed in the box body 20.

[0197] The heat management component 27 refers to a component which can exchange heat with the external environment to control the temperature inside the box body 20. The heat management component 27 can be a structure such as a semiconductor refrigeration device, a heating device, a cold plate, a heat pipe, etc.

[0198] By means of the above technical solution, the heat management component 27 is provided, which can well manage the heat of the battery monomer 300, so as to provide a suitable working temperature for the battery monomer 300.

[0199] In some embodiments, referring to Figure 4 The heat management component 27 is installed on the side of the main plate 211 close to the protruding part 212, and the heat management component 27 is provided with a channel 271 for the flow of heat exchange liquid.

[0200] The heat management component 27 is installed on the side of the main plate 211 close to the protruding part 212, that is, the heat management component 27 is installed on the inner surface of the main plate 211, and the inner surface of the main plate 211 refers to the surface of the main plate 211 close to the accommodation space 2001 inside the box body 20 which accommodates the battery monomer 300.

[0201] The channel 271 refers to a cavity structure provided in the heat management component 27 and can be used for the flow of liquid. The heat management component 27 is provided with the channel 271 for the flow of heat exchange liquid, which can flow in the channel 271 to exchange heat with the inside of the box body 20 through the heat exchange liquid, thereby improving the heat exchange efficiency. As an example, the heat management component 27 can be a structure such as a coil, a cold plate provided with the channel 271, etc.

[0202] By means of the above technical solution, the heat management component 27 can be supported by the main plate 211, and the channel 271 is provided in the heat management component 27 to flow the heat exchange liquid, so as to realize liquid heat exchange, improve the heat exchange efficiency, and better provide a good working temperature environment for the battery monomer 300.

[0203] In some embodiments, referring to Figures 4 to 8 The box main body 21 is an integrally formed structure.

[0204] The box main body 21 is an integrally formed structure, that is, the components of the box main body 21 are integrally formed, such as the main plate 211 and the protruding part 212 are an integrally formed structure, so as to fix the connection between the main plate 211 and the protruding part 212, improve the connection strength, and facilitate processing and manufacturing.

[0205] As an example, when the protruding part 212 comprises a first plate body 2121 and a second plate body 2122, the main plate 211, the first plate body 2121 and the second plate body 2122 are an integrally formed structure.

[0206] Through the technical scheme, the processing of the box body 21 is facilitated, the overall strength of the box body 21 is improved, and the structural strength of the box body 20 is improved.

[0207] In some embodiments, the main body plate 211 and the protruding part 212 can also be respectively manufactured, and then the main body plate 211 and the protruding part 212 are fixedly connected by bonding, welding, using fasteners or other structures.

[0208] In some embodiments, the first plate body 2121 and the second plate body 2122 can also be respectively manufactured, and then the first plate body 2121 and the second plate body 2122 are fixedly connected by bonding, welding, using fasteners or other structures.

[0209] In some embodiments, referring to Figure 2 The box body 21 further comprises a frame 210, the frame 210 is arranged around the main body plate 211, and the frame 210 is connected with the edge of the main body plate 211. The frame 210 can be arranged as at least part of the side wall structure of the box body 20.

[0210] In some embodiments, the box body 21 can also only comprise the main body plate 211 and the protruding part 212, and does not comprise the frame 210.

[0211] In some embodiments, referring to Figure 4 The box body 21 is in a basin-shaped structure.

[0212] The basin-shaped structure refers to a shape structure similar to a basin. The box body 21 is arranged in a basin-shaped structure, so that the main body plate 211 of the box body 21 can be arranged as the bottom of the basin-shaped structure to form the main part structure of the box body 20, and the side wall of the basin-shaped structure can be arranged as at least part of the frame 210 of the box body 21.

[0213] Through the technical scheme, the box body 21 is arranged in a basin-shaped structure, so that the box body 20 for accommodating the battery monomer 300 can be conveniently manufactured, the components of the box body 20 are reduced, and the assembly of the box body 20 is facilitated.

[0214] In some embodiments, the box body 21 is a composite part.

[0215] The composite part refers to a box structure manufactured by using a composite structure.

[0216] Through the technical scheme, the box body 21 uses a composite part, so that the weight is light, the structural strength is high, and the durability is good.

[0217] In some embodiments, the box body 21 is manufactured by using a fiber composite material, so that the weight is light, the structural strength is high, and the corrosion resistance is strong.

[0218] In some embodiments, referring toFigures 9 to 16 、 Figure 10 、 Figure 15 The box body 20 includes a frame beam 24, the box main body 21 includes a side wall plate 213 and a first extension 214, the side wall plate 213 is extended and arranged by the edge of the main body plate 211 towards the side where the protruding part 212 is located, the first extension 214 is extended and arranged by the outer surface of the side wall plate 213 towards the direction away from the accommodation space 2001, the frame beam 24 is provided with a first accommodation space 2401 which is adapted to accommodate the first extension 214.

[0219] The frame beam 24 refers to the beam column structure which is located at the outer edge of the box body 20 and can be part of the frame of the box body 20. The setting of the frame beam 24 can improve the structural strength of the edge of the box body 20 and improve the anti-deformation ability of the edge of the box body 20. As an example, the frame beam 24 can be arranged on one side of the box body 20. As an example, the frame beam 24 can also be arranged on opposite sides of the box body 20 respectively. As an example, the frame beam 24 can also be arranged on each side of the box body 20. As an example, the frame beam 24 can also be arranged on adjacent sides of the box body 20. The frame beam 24 can be made of metal materials such as steel, aluminum alloy, etc. Of course, in some embodiments, the frame beam 24 can also be made of composite materials such as carbon fiber, glass fiber, etc. to further reduce the weight and improve the strength.

[0220] The side wall plate 213 refers to the part plate structure in the box main body 21 which is connected with the edge of the main body plate 211 and is arranged protruding from the edge of the main body plate 211 towards the side where the protruding part 212 is located. The side wall plate 213 can be part of the side wall structure of the box body 20.

[0221] In some embodiments, the main body plate 211 and the side wall plate 213 can be an integrally formed structure so as to firmly connect the main body plate 211 and the side wall plate 213 and facilitate processing and manufacturing. In some embodiments, the main body plate 211 and the side wall plate 213 can be separately manufactured and then fixedly connected by means of bonding, welding, using fasteners 23, etc.

[0222] The outer surface of the side wall plate 213 refers to the surface of the side wall plate 213 which is away from the inner accommodation space 2001 of the box body 20.

[0223] The first extension 214 refers to the structure which is arranged extending on the outer surface of the side wall plate 213 towards the side away from the accommodation space 2001. The arrangement of the first extension 214 on the outer surface of the side wall plate 213 can stabilize the side wall plate 213 and increase the structural strength. As an example, please refer to Figure 11 The first extension 214 can be a plate-shaped structure. As an example, please refer to Figure 12The first extension 214 can also be a groove-shaped structure. For example, the first extension 214 can be a structure formed by outwardly recessing a portion of the side wall plate 213. The first extension 214 is provided in a groove-shaped structure, which facilitates processing and manufacturing.

[0224] In some embodiments, the first extension 214 and the side wall plate 213 can be an integrally formed structure, so that the first extension 214 is firmly connected to the side wall plate 213 and facilitates processing and manufacturing. In some embodiments, the first extension 214 and the side wall plate 213 can be separately manufactured and then fixedly connected by bonding, welding, using fasteners 23, or the like.

[0225] The first receiving space 2401 refers to a space provided on the frame beam 24. During assembly, the first extension 214 can be placed in the first receiving space 2401. The provision of the first receiving space 2401 to accommodate the first extension 214 can increase the connection area of the frame beam 24 and the box body 21 and improve the connection strength of the frame beam 24 and the box body 21.

[0226] With the above technical solutions, the first extension 214 is provided on the outer surface of the side wall plate 213, and the first receiving space 2401 is provided on the frame beam 24 to accommodate the first extension 214. This can increase the connection area of the frame beam 24 and the first extension 214, improve the stability of the connection, and thus improve the connection strength of the frame beam 24 and the box body 21. Moreover, the frame beam 24 can well support the first extension 214, and thus well support the box body 21, and improve the stability of the overall structure of the box body 20.

[0227] In some embodiments, when the box body 21 includes the side wall plate 213, the side wall plate 213 can serve as a part of the frame 210.

[0228] In some embodiments, when the side edge of the box body 20 is provided with the frame beam 24, the frame beam 24 can also serve as a mounting beam of the box body 20. The mounting beam refers to a beam structure used to connect an external device using the battery device 200 to support the battery device 200 on the device.

[0229] In some embodiments, the frame beam 24 is provided with a weight-reducing cavity 2403. The weight-reducing cavity 2403 refers to a cavity structure provided on the frame beam 24 to reduce the weight of the frame beam 24. For example, the weight-reducing cavity 2403 can be a hole structure provided on the frame beam 24, or a groove structure provided on the frame beam 24.

[0230] In some embodiments, the weight-reducing cavity 2403 extends along the length direction of the frame beam 24.

[0231] The weight-reducing cavity 2403 is arranged along the length direction of the frame beam 24, and the volume of the weight-reducing cavity 2403 can be made larger to better reduce the weight of the frame beam 24.

[0232] In some embodiments, the frame beam 24 can adopt a profile structure to facilitate processing and manufacturing, and to facilitate forming the weight-reducing cavity 2403 in the frame beam 24.

[0233] Through the above technical solutions, the weight of the frame beam 24 can be reduced, and thus the weight of the cabinet 20 can be reduced; and the weight-reducing cavity 2403 is arranged along the length direction of the frame beam 24, which facilitates the processing and manufacturing of the frame beam 24 and the weight-reducing cavity 2403 thereon.

[0234] In some embodiments, the frame beam 24 can adopt a cast structure, and the weight-reducing cavity 2403 can be processed and manufactured thereon. In some embodiments, the frame beam 24 can also be made of a roll-pressed structure to form the weight-reducing cavity 2403 therein. In some embodiments, the frame beam 24 can also be made of a forged structure.

[0235] In some embodiments, referring to Figures 11 to 14 and Figures 11 to 14 , the cabinet body 21 includes a second extending portion 215 extending from the first extending portion 214 away from one side of the side wall plate 213 toward a side away from the accommodating space 2001, and an inner surface of the second extending portion 215 cooperates with the first extending portion 214 to form a receiving groove 2130; the frame beam 24 includes an outer side beam 241 and an adapter beam 242, and the adapter beam 242 is arranged in the receiving groove 2130; the side wall plate 213 cooperates with the first extending portion 214 and the second extending portion 215 to form a stepped portion near the side of the first extending portion 214 close to the main body plate 211; the outer side beam 241 has a stepped surface matching the outer surface of the stepped portion, and the stepped surface is adhesively connected to the stepped portion.

[0236] The second extending portion 215 refers to a plate-shaped component structure arranged on the first extending portion 214 and extending in a direction away from the main body plate 211. The second extending portion 215 arranged on the first extending portion 214 can stabilize the first extending portion 214, increase the structural strength, and form a stepped structure.

[0237] In some embodiments, the first extending portion 214 and the second extending portion 215 can be integrally formed to firmly connect the first extending portion 214 and the second extending portion 215 and facilitate processing and manufacturing. In some embodiments, the first extending portion 214 and the second extending portion 215 can be separately manufactured and then fixedly connected by adhesion, welding, use of fasteners 23, or the like.

[0238] The inner surface of the second extending portion 215 refers to the surface of the second extending portion 215 close to the side wall plate 213.

[0239] The inner surface of the second extension part 215 cooperates with the first extension part 214 to form the accommodation groove 2130, which means that the second extension part 215 can form a stepped structure in combination with the first extension part 214, so that the inner surface of the second extension part 215 and the side of the first extension part 214 away from the main body plate 211 form the accommodation groove 2130.

[0240] The outer side beam 241 refers to the part of the frame beam 24 located on the side of the outer surface of the side wall plate 213 and the outer surface of the second extension part 215. The outer surface of the second extension part 215 refers to the surface of the second extension part 215 opposite to the inner surface of the second extension part 215.

[0241] The adaptive beam 242 refers to the part of the frame beam 24 that is adapted to the accommodation groove 2130 so as to be installed in the accommodation groove 2130.

[0242] The frame beam 24 includes the outer side beam 241 and the adaptive beam 242, that is, the outer side beam 241 and the adaptive beam 242 combine to form the frame beam 24. The first receiving space 2401 is formed between the outer side beam 241 and the adaptive beam 242.

[0243] The side wall plate 213 on the side of the first extension part 214 close to the main body plate 211 forms a stepped part in combination with the first extension part 214 and the second extension part 215, that is, the part of the structure of the side wall plate 213 on the side of the first extension part 214 close to the main body plate 211 and the structure formed by the combination of the first extension part 214 and the second extension part 215 are stepped.

[0244] The step surface refers to the surface provided on the outer side beam 241, and the surface is the surface of the outer side beam 241 close to the box main body 21.

[0245] The outer side beam 241 has a step surface that is adapted to the outer surface of the stepped part, which means that the shape of the step surface on the outer side beam 241 is adapted to the shape of the stepped part. The step surface and the stepped part are connected by adhesion, which can increase the adhesion area of the outer side beam 241 and the box main body 21, and further improve the connection strength of the outer side beam 241 and the box main body 21.

[0246] The step surface can be connected to the stepped part by adhesives such as double-sided tape, structural adhesive, and curing adhesive.

[0247] Through the above technical solutions, the accommodation groove 2130 can be formed between the adaptive beam 242 and the outer side beam 241 to accommodate the first extension part 214. In addition, the setting of the adaptive beam 242 can improve the strength of the position between the second extension part 215 and the side wall plate 213. The adhesion design of the step surface of the outer side beam 241 and the stepped part can increase the adhesion area of the outer side beam 241 and the box main body 21, and further improve the connection strength of the outer side beam 241 and the box main body 21.

[0248] In some embodiments, the outer side beam 241 can adopt a profile structure for machining production. In some embodiments, the outer side beam 241 can adopt a cast structure. In some embodiments, the outer side beam 241 can also be produced using a rolling structure. In some embodiments, the outer side beam 241 can also be produced using a forging structure.

[0249] In some embodiments, the adapter beam 242 can adopt a profile structure for machining production. In some embodiments, the adapter beam 242 can adopt a cast structure. In some embodiments, the adapter beam 242 can also be produced using a rolling structure. In some embodiments, the adapter beam 242 can also be produced using a forging structure.

[0250] In some embodiments, referring to Figure 11 , the box body 21 comprises a folding portion 216, which is provided outwardly away from one side of the second extension portion 215, and the outer side beam 241 is provided with a support portion 2411 adapted to be connected to the folding portion 216.

[0251] The folding portion 216 refers to a plate-shaped component structure extending away from the side wall plate 213 on the second extension portion 215. The folding portion 216 is provided on the second extension portion 215 to stabilize the second extension portion 215 and increase the structural strength, and can form a stepped structure.

[0252] In some embodiments, the folding portion 216 and the second extension portion 215 can be integrally formed to firmly connect the folding portion 216 and the second extension portion 215 and facilitate machining production. In some embodiments, the folding portion 216 and the second extension portion 215 can be separately produced and then fixedly connected by means of adhesion, welding, use of fasteners 23, etc.

[0253] The support portion 2411 refers to a portion of the outer side beam 241 provided to correspondingly contact the folding portion 216. The support portion 2411 is provided on the outer side beam 241 to connect with the folding portion 216, which can increase the connection area and improve the structural strength of the connection.

[0254] Through the above technical solution, the provision of the folding portion 216 can facilitate the connection of the box body 21 and the cover 62 of the box body 20, and can improve the strength of the box body 21. Moreover, the outer side beam 241 is correspondingly provided with the support portion 2411 to connect with the folding portion 216, which can increase the connection area of the outer side beam 241 and the box body 21, thereby improving the connection strength of the frame beam 24 and the box body 21.

[0255] In some embodiments, the folding portion 216 can be adhesively connected to the support portion 2411 by means of double-sided adhesive, structural adhesive, curing adhesive, etc., which is convenient for connection.

[0256] In some embodiments, the folding portion 216 can also be connected with the support portion 2411 by a fastener 23 such as a bolt, a rivet, etc.

[0257] In some embodiments, referring to Figure 12 , the second extending portion 215 is riveted to the outer side beam 241.

[0258] The second extending portion 215 is riveted to the outer side beam 241 means that the second extending portion 215 is fixedly connected to the side wall of the outer side beam 241 adjacent to the second extending portion 215 by a rivet 28.

[0259] By the above technical solution, the connection strength and stability of the second extending portion 215 and the outer side beam 241 can be improved, the anti-vibration performance can be improved, and the risk of loose connection between the second extending portion 215 and the outer side beam 241 can be well reduced.

[0260] In some embodiments, the second extending portion 215 and the outer side beam 241 can also be connected by a fastener such as a bolt, a lock, etc.

[0261] In some embodiments, referring to Figure 11 and Figure 13 , the adaptive beam 242 is adhesively connected to the inner surface of the accommodating groove 2130.

[0262] The adaptive beam 242 is adhesively connected to the inner surface of the accommodating groove 2130 means that the adaptive beam 242 is fixedly connected to the inner surface of the accommodating groove 2130 by an adhesive such as double-sided tape, structural adhesive, curing adhesive, etc.

[0263] By the above technical solution, the assembly and fixation of the adaptive beam 242 can be facilitated, thereby improving the connection strength of the frame beam 24 and the box main body 21 and improving the overall structural strength of the box body 20.

[0264] In some embodiments, the adaptive beam 242 can be fixedly connected to the first extending portion 214 by a fastener 23.

[0265] In some embodiments, the adaptive beam 242 can be fixedly connected to the second extending portion 215 by a fastener 23.

[0266] In some embodiments, referring to Figure 13 and Figure 14 , the first extending portion 214 is located in a middle region of the side wall plate 213 along the height direction Z.

[0267] The middle region of the side wall plate 213 along the height direction Z means a partial region of the side wall plate 213 after removing both ends along the height direction Z, or means a partial region of the side wall plate 213 between both end portions along the height direction Z.

[0268] The first extension 214 is located in the middle region of the side wall plate 213 along the height direction Z, that is, the part of the side wall plate 213 protrudes the first extension 214 away from one side of the main body plate 211 along the height direction Z.

[0269] The first extension 214 is located in the middle region of the side wall plate 213 along the height direction Z, which can better improve the structural strength of the side wall plate 213 through the first extension 214.

[0270] Through the above technical solution, the first extension 214 is arranged in the middle region, the structural strength of the side wall plate 213 is enhanced, the first extension 214 is better supported by the side wall plate 213, and the height of the side wall plate 213 can also be set higher, so that the space formed in the box body 21 can have a greater depth to accommodate the battery monomer 300, facilitating the assembly of the battery monomer 300, and the side wall plate 213 can also better support the side of the battery monomer 300, improving the anti-expansion performance of the box body 20.

[0271] In some embodiments, when the first extension 214 is located in the middle region of the side wall plate 213 along the height direction Z, and the second extension 215 is arranged on the first extension 214, the part of the side wall plate 213 away from the main body plate 211 of the first extension 214 can be used as one side wall of the accommodating groove 2130 to better position the adapter beam 242.

[0272] In some embodiments, referring to Figure 14 and Figure 16 , the first extension 214 is located in the middle region of the side wall plate 213 along the height direction Z, and the side of the side wall plate 213 away from the main body plate 211 extends outwardly with a folded edge plate 218. Correspondingly, the side of the frame beam 24 away from the main body plate 211 is connected with the folded edge plate 218, so that the frame beam 24 only needs to be provided with a first receiving space 2401 on the side close to the side wall plate 213, which can simplify the structure.

[0273] In some embodiments, referring to Figure 14 and Figure 16 , the box body 21 comprises a third extension 217, the third extension 217 is arranged outwardly from the outer surface of the side wall plate 213, the third extension 217 is located on the side of the first extension 214 close to the main body plate 211, and the frame beam 24 is provided with a second receiving space 2402 adapted to accommodate the third extension 217.

[0274] The third extension 217 refers to a structure extending from the outer surface of the side wall plate 213 in a direction away from the accommodating space 2001. The outer surface of the side wall plate 213 is provided with the third extension 217, which can stabilize the side wall plate 213 and increase the structural strength. As an example, referring to Figure 11The third extension 217 can be a plate structure. As an example, refer to Figure 12 The third extension 217 can also be a groove structure. For example, the third extension 217 can be a structure formed by outwardly recessing part of the side wall plate 213. The third extension 217 is provided in a groove structure, which facilitates processing and manufacturing.

[0275] In some embodiments, the third extension 217 and the side wall plate 213 can be an integrally formed structure, so that the third extension 217 is firmly connected to the side wall plate 213 and facilitates processing and manufacturing. In some embodiments, the third extension 217 and the side wall plate 213 can be separately manufactured and then fixedly connected by bonding, welding, using fasteners 23, or the like.

[0276] The third extension 217 is located on the side of the first extension 214 close to the main body plate 211, that is, the side wall plate 213 protrudes from the side of the third extension 217 away from the main body plate 211.

[0277] The second accommodation space 2402 refers to a space provided on the frame beam 24. In assembly, the third extension 217 can be placed in the second accommodation space 2402. By providing the second accommodation space 2402 to accommodate the third extension 217, the connection area of the frame beam 24 and the box main body 21 can be increased, and the connection strength of the frame beam 24 and the box main body 21 can be improved.

[0278] Through the above technical solutions, the provision of the third extension 217 can not only improve the structural strength of the part where the side wall plate 213 is located and better support the side wall plate 213, but also the provision of the second accommodation space 2402 on the frame beam 24 can further increase the connection area of the box main body 21 and the frame beam 24 and enhance the connection strength of the frame beam 24 and the box main body 21.

[0279] In some embodiments, the third extension 217 can be provided as one to facilitate processing and manufacturing. In some embodiments, the third extension 217 can also be provided as a plurality, and the plurality of third extensions 217 are spaced apart in the height direction Z to increase the connection area of the box main body 21 and the frame beam 24 and enhance the connection strength of the frame beam 24 and the box main body 21. The plurality refers to two or more.

[0280] In some embodiments, the third extension 217 can be fixedly connected to the inner surface of the second accommodation space 2402 by an adhesive such as double-sided tape, structural adhesive, curing adhesive, or the like, so as to be connected and fixed and improve the connection strength of the frame beam 24 and the box main body 21.

[0281] In some embodiments, refer to Figure 14 , Figure 11 and Figure 12The receiving portion 243 is provided on the frame beam 24 and extends towards the main plate 211.

[0282] The receiving portion 243 refers to a part of the frame beam 24 that extends towards the main plate 211.

[0283] The side of the main plate 211 away from the protruding portion 212 refers to the side of the main plate 211 away from the space in the box body 20 for accommodating the battery monomer 300.

[0284] The receiving portion 243 is connected to the side of the main plate 211 away from the protruding portion 212, which means that the receiving portion 243 and the side of the main plate 211 away from the protruding portion 212 can be fixedly connected by means of adhesion, welding, clamping, or using fasteners 23.

[0285] By the above technical solution, the receiving portion 243 is provided and connected to the main plate 211, which increases the connection area of the frame beam 24 and the box main body 21, improves the connection strength of the frame beam 24 and the box main body 21, and better supports the main plate 211.

[0286] In some embodiments, the receiving portion 243 can be connected to the main plate 211 by adhesives such as double-sided tape, structural adhesive, curing adhesive, etc.

[0287] In some embodiments, the main plate 211 can also be connected to the main plate 211 by fasteners 23 such as bolts or rivets.

[0288] In some embodiments, please refer to Figure 14 , ​ and ​ The main plate 211 is recessed with a receiving groove 2111 on the side corresponding to the position of the receiving portion 243 towards the protruding portion 212, and the receiving portion 243 is placed in the receiving groove 2111.

[0289] The receiving groove 2111 refers to a groove structure provided on the main plate 211.

[0290] The main plate 211 is recessed with a receiving groove 2111 on the side corresponding to the position of the receiving portion 243 towards the protruding portion 212, which means that the receiving groove 2111 on the main plate 211 is located at the position corresponding to the receiving portion 243, that is, the receiving groove 2111 is located on the side of the main portion close to the frame beam 24, and is a groove structure formed by recessing the main portion towards the inside of the box body 20.

[0291] By the technical scheme, the accommodating groove 2111 is arranged on the main plate 211 to accommodate the receiving part 243, so that the receiving part 243 can be conveniently installed and fixed, and the accommodating groove 2111 arranged on the main plate 211 can also improve the structural strength of the main plate 211.

[0292] According to some embodiments of the present application, the battery device 200 is provided, which comprises a box 20 having an accommodating space 2001 and a battery cell 300 installed in the accommodating space 2001; the box 20 comprises a box main body 21 and a limiting beam 22; the box main body 21 is made of a composite material, and the box main body 21 comprises a main plate 211 and a protruding part 212 connected with the main plate 211, the battery cell 300 is supported on the main plate 211, the protruding part 212 is arranged on the side of the main plate 211 along the height direction Z of the box 20, the protruding part 212 is formed with an accommodating space 2120, and the limiting beam 22 is installed in the accommodating space 2120. The protruding part 212 comprises a first plate body 2121 and a second plate body 2122, the first plate body 2121 is arranged on one side of the main plate 211 along the height direction Z of the box 20, the second plate body 2122 connects the first plate body 2121 and the main plate 211, and the first plate body 2121 is fixedly connected with the end face of the limiting beam 22 away from the main plate 211.

[0293] According to the technical scheme, the limiting beam 22 is installed in the accommodating space 2120 formed in the protruding part 212, the structure strength of the protruding part 212 can be supported and strengthened by the limiting beam 22, the limiting beam 22 is fixedly connected with the main plate 211, and the expansion deformation of the battery cell 300 is limited by the cooperation of the limiting beam 22 and the protruding part 212, so that the anti-expansion performance of the box 20 is improved.

[0294] According to some embodiments of the present application, the present application also provides a power utilization device, which comprises the battery device 200 as described in the above embodiments, and the battery device 200 is used for storing or providing electric energy.

[0295] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises a box body having a containing space and a battery cell installed in the containing space; the box body comprises a box main body and a limiting beam; The box main body comprises a main body plate and a protruding part connected with the main body plate, the battery cell is supported on the main body plate, the protruding part is arranged to extend from the main body plate to the side of the main body plate along the height direction of the box body, an accommodating space is formed in the protruding part, the limiting beam is installed in the accommodating space, the limiting beam is connected with the inner surface of the protruding part by adhesion, an opening is formed in the main body plate corresponding to the position of the protruding part, the opening is used for inserting the limiting beam into the accommodating space, the end of the limiting beam close to the opening is flush with the main body plate, or the end of the limiting beam close to the opening protrudes from the main body plate, the limiting beam and the protruding part cooperate to resist the battery cell.

2. The battery device of claim 1, wherein The protruding part comprises a first plate body and a second plate body, the first plate body is arranged on one side of the main body plate along the height direction of the box body, and the second plate body connects the first plate body and the main body plate, and the first plate body is fixedly connected with the end face of the limiting beam away from the main body plate.

3. The battery device of claim 2, wherein The first plate body and the limiting beam are fixedly connected by a fastener.

4. The battery device of claim 2, wherein The second plate body is arranged at least close to one side of the battery cell.

5. The battery device according to any one of claims 1 to 4, wherein The battery cell comprises a shell and an electrode assembly arranged in the shell, the size of the protruding part protruding from the main body plate is H, the size of the shell along the height direction is L, and H / L≥0.

5.

6. The battery device of claim 5, wherein H / L≥0.

8.

7. The battery device of claim 5, wherein The shell comprises a shell body and an end cover covering the shell body, the end cover is located at the end of the shell body away from the main body plate, H>L, or H≤L-3mm.

8. The battery device of claim 7, wherein, L-8mm≤H≤L-3mm.

9. The battery device of any one of claims 1-4, 6-8, wherein, The box body comprises a guard plate arranged on the side of the main body plate away from the protruding part, and the limiting beam is arranged on the guard plate.

10. The battery device of claim 9, wherein, The guard plate and the limiting beam are connected by adhesion.

11. The battery device of any one of claims 1-4, 6-8, 10, wherein, The box main body is an integral molding structure.

12. The battery device of any one of claims 1-4, 6-8, 10, wherein, The box main body has a basin-shaped structure.

13. The battery device of any one of claims 1-4, 6-8, 10, wherein, The box main body is a composite part.

14. An electrical device, characterized by The battery device comprises a box body having a containing space and a battery cell installed in the containing space; the box body comprises a box main body and a limiting beam;

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