Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device, the battery device comprising: a box body having a containing cavity; a battery cell assembly arranged in the containing cavity; a structural beam extending along a second direction and fixed to the box body, and arranged on at least one side of the battery cell assembly in a first direction; and a fixing plate arranged on one side of the battery cell assembly in a third direction, the length of the fixing plate being smaller than the length of the battery cell assembly in the first direction, and the two ends of the fixing plate in the first direction being fixed to the structural beam and the battery cell assembly respectively. In the above technical manner, the anti-expansion effect of the battery cell can be guaranteed, the length of the fixing plate can be shortened, the material consumption and weight can be reduced, the cost can be reduced, the occupied space of the fixing plate in the box body can be reduced, the energy density of the battery device can be improved, the contact area of the fixing plate and the battery cell assembly can be reduced, and the risk of insulation failure of the battery cell can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] In battery devices, to address the volume expansion of individual battery cells during charging and discharging, structural beams and clamping strips are typically used to mechanically constrain the battery cell assembly, preventing short circuits between cells or deformation of the assembly due to expansion. Among these, the clamping strip structure commonly employs a through-type clamping strip, extending from one end of the battery cell assembly to the other, with both ends connected to structural beams. This structure carries a short-circuit risk, requires a large amount of material, is heavy, and is costly, making maintenance of the battery cell assembly difficult. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device incorporating the battery device, which can shorten the length of the fixing plate, reduce material usage and weight, reduce cost, reduce space occupation, and reduce the risk of insulation failure of individual battery cells.

[0004] In a first aspect, embodiments of this application provide a battery device, comprising: a housing having a receiving cavity; a battery cell assembly disposed within the receiving cavity and comprising a plurality of battery cells stacked along a first direction; a structural beam extending along a second direction and fixed to the housing, and disposed on at least one side of the battery cell assembly in the first direction; and a fixing plate disposed on one side of the battery cell assembly in a third direction, wherein the first direction, the second direction, and the third direction intersect each other but are not coplanar, and along the first direction, the length of the fixing plate is smaller than the length of the battery cell assembly, and both ends of the fixing plate in the first direction are fixed to the structural beam and the battery cells, respectively.

[0005] In the above-mentioned technical method, by setting a fixing plate with a length along the first direction that is less than the length of the battery cell assembly, and fixing both ends of the fixing plate to the structural beam and the battery cell respectively, the anti-expansion effect of the battery cell can be guaranteed. It can also shorten the length of the fixing plate, reduce the amount of material used and weight, reduce costs, reduce the space occupied by the fixing plate in the box, and improve the energy density of the battery device. It can also reduce the contact area between the fixing plate and the battery cell assembly, and reduce the risk of insulation failure of the battery cell.

[0006] In some embodiments, along the first direction, the overlap length between the fixing plate and the battery cell assembly is less than half the length of the battery cell assembly; and / or, along the first direction, the fixing plate is fixedly connected to at least two of the battery cells in the battery cell assembly.

[0007] In the above-mentioned technical method, by making the overlap length between the fixing plate and the battery cell assembly along the first direction less than or equal to half the length of the battery cell assembly, the length of the fixing plate can be further shortened while ensuring the anti-expansion effect on the battery cell, thereby reducing the amount of material used and the material cost. The contact area between the fixing plate and the battery cell assembly can be further reduced, thereby reducing the risk of insulation failure of the battery cell. By fixing the fixing plate to at least two battery cells in the battery cell assembly, sufficient connection area between the fixing plate and the battery cell assembly can be ensured, thereby improving the connection strength and reliability between the fixing plate and the battery cell assembly and ensuring the anti-expansion effect of the fixing plate on the battery cell.

[0008] In some embodiments, the fixing plate is bonded to the housing of the battery cell by an adhesive.

[0009] In the above-mentioned technical method, since the fixing plate and the battery cell housing are bonded together by adhesive, the number of parts can be reduced, the assembly process of the fixing plate and the battery cell can be simplified, and the assembly efficiency can be improved while ensuring the reliability of the connection between the fixing plate and the battery cell.

[0010] In some embodiments, the shear strength of the adhesive is greater than the allowable tensile stress of the fixing plate.

[0011] In the above-mentioned technical method, by making the shear strength of the adhesive component greater than the allowable tensile stress of the fixing plate, when the connection position between the fixing plate and the battery cell is under large stress or extreme stress conditions, the fixing plate can reach the stress limit and yield or fail before the adhesive component. Thus, the probability of fixing plate failure due to cracking or delamination of the adhesive interface can be reduced, effectively ensuring the connection reliability between the battery cell and the fixing plate.

[0012] In some embodiments, the adhesive is a structural adhesive or a foam adhesive.

[0013] In the above technical methods, by setting the adhesive as structural adhesive, the bonding strength between the fixing plate and the battery cell can be further guaranteed, and the connection reliability can be improved. By setting the adhesive as foam, the foam can play a buffering and energy-absorbing role between the fixing plate and the battery cell, absorb the expansion stress of the battery cell, reduce the rigid impact on the connection position, and improve the service life of the connection position.

[0014] In some embodiments, the battery device further includes a buffer member disposed between the fixing plate and the battery cell.

[0015] In the above-mentioned technical method, by placing the buffer between the fixing plate and the battery cell, the buffer can absorb and disperse the expansion stress generated by the battery cell in the battery cell assembly, reduce the risk of local overload of the adhesive, and thus extend the service life of the adhesive.

[0016] In some embodiments, the buffer and the adhesive are stacked on top of each other in the third direction, or the buffer and the battery cell cooperate to form a glue-filling groove, and the adhesive fills the glue-filling groove.

[0017] In the above-mentioned technical approach, by stacking the buffer component and the adhesive component, the absorption and dispersion effect of the buffer component on the expansion stress of the battery cell can be improved, thereby extending the service life of the battery device. By defining the adhesive reservoir by the buffer component and filling the adhesive reservoir with structural adhesive, the amount and thickness of structural adhesive can be accurately controlled, reducing the amount of structural adhesive overflow and lowering the risk of overflow. Thus, the buffer component can not only buffer and disperse stress, but also improve the bonding efficiency and bonding quality between the fixing plate and the battery cell.

[0018] In some embodiments, the fixing plate is provided with a first positioning part, and the battery cell assembly is provided with a second positioning part. The first positioning part and the second positioning part are positioned and cooperated to position the relative position of the fixing plate and the battery cell assembly.

[0019] In the above-mentioned technical method, the first positioning part and the second positioning part are used to position the relative position of the fixing plate and the battery cell assembly. This can achieve rapid and accurate positioning of the fixing plate and the battery cell assembly during the assembly process, improve assembly efficiency and assembly accuracy, and reduce the risk of uneven clamping caused by misalignment between the fixing plate and the battery cell assembly.

[0020] In some embodiments, the second positioning portion is formed as a positioning hole or positioning groove; and / or, the second positioning portion is formed on the housing of the battery cell, or, two adjacent battery cells cooperate to define the second positioning portion.

[0021] In the above-mentioned technical approach, by forming the second positioning part as a positioning hole or positioning groove, the structure of the second positioning part can be simplified, making it easier to process and manufacture. By setting the second positioning part on the housing of the battery cell, the positioning accuracy of the fixing plate can be further improved, and the assembly accuracy can be improved. By defining the second positioning part by the cooperation of two adjacent battery cells, the fixing plate can be effectively positioned without processing the housing of the battery cell, thereby improving positioning efficiency and simplifying the structure.

[0022] In some embodiments, the fixing plate is bolted, riveted, welded, or snap-fitted to the structural beam.

[0023] In the above-mentioned technical methods, by connecting the fixing plate to the structural beam with bolts, rivets, or welding, the structural strength of the connection between the fixing plate and the structural beam can be improved, and the reliability of the connection can be enhanced. By snapping the fixing plate to the structural beam, the quick installation and disassembly between the fixing plate and the structural beam can be facilitated, thereby improving the efficiency of assembly and production, and facilitating the maintenance and replacement of the fixing plate.

[0024] In some embodiments, a portion of the fixing plate is formed as a connecting area, the connecting area having a first connecting hole, and the structural beam having a second connecting hole. The connecting area is fixedly connected to the structural beam by a connector passing through the first connecting hole and the second connecting hole, wherein the structural strength of the connecting area is greater than the structural strength of the rest of the fixing plate.

[0025] In the above-mentioned technical method, by setting the structural strength of the connection area forming the first connection hole to be greater than the structural strength of the rest of the fixing plate, the risk of breakage at the connection area can be reduced when the battery cell assembly expands and deforms, thereby improving the service life of the fixing plate.

[0026] In some embodiments, the connection area is provided with a reinforcing structure.

[0027] In the above-mentioned technical approach, by setting a reinforcing structure in the connection area, the structural stiffness and tensile and shear resistance of the connection area can be improved, the risk of stress concentration, cracking and deformation around the first connection hole can be reduced, and the stability, reliability and service life of the connection position can be improved.

[0028] In some embodiments, the fixing plate includes: a first plate portion and a second plate portion, the first plate portion extending along the second direction as an elongated plate body and fixed to the structural beam, the second plate portion being connected to at least one side of the first plate portion in the first direction and extending along the first direction, and the second plate portion being fixed to the battery cell.

[0029] In the above-mentioned technical method, by extending the first plate into a long strip-shaped plate along the second direction, the connection area between the first plate and the structural beam can be increased, and the connection reliability between the fixed beam and the first plate can be enhanced. By setting the second plate, it is convenient to overlap and connect with the battery cell assembly, which facilitates the assembly between the fixed plate and the battery cell assembly and improves the assembly efficiency.

[0030] In some embodiments, along the second direction, the end edges of both ends of the first plate portion are flush with the end edges of both ends of the second plate portion; or, the length dimension of the first plate portion along the second direction is greater than the width dimension of the second plate portion along the second direction.

[0031] In the above-mentioned technical method, by aligning the end edges of the first plate and the second plate with each other in the second direction, the structure of the fixing plate can be simplified, the processing of the fixing plate can be facilitated, and the production efficiency can be improved. By making the length of the first plate in the second direction greater than the dimension of the second plate in the second direction, the connection contact area between the first plate and the structural beam can be increased, thereby improving the connection reliability between the fixing beam and the first plate.

[0032] In some embodiments, the first plate portion is connected to a second plate portion on one side of the first direction, the second plate portion is connected at the middle position of the first plate portion in the second direction, or the second plate portion is connected to the end of one end of the first plate portion in the second direction; or, the first plate portion is connected to a plurality of second plate portions on one side of the first direction, and the plurality of second plate portions are spaced apart along the second direction.

[0033] In the above-mentioned technical method, by connecting the second plate to the middle position of the first plate, the uniformity of force on the fixing plate along the second direction can be improved; by connecting the second plate to the end of one end of the first plate, the fixing plate can be conveniently arranged at the corner position where the structural beam and the box side wall are connected, reducing the risk of interference between the fixing plate and the box; by setting multiple second plates on one side of the first plate, the number of parts can be reduced, and the assembly efficiency and anti-expansion effect can be improved.

[0034] In some embodiments, the fixing plate further includes a connecting portion, wherein the first plate portion and the second plate portion are connected by the connecting portion, and the connecting portion is configured to allow relative displacement between the first plate portion and the second plate portion.

[0035] In the above-mentioned technical method, since the first plate and the second plate are connected by a connecting part, and the connecting part allows the first plate and the second plate to move relative to each other, when the battery cell expands, the connecting part can not only allow the first plate and the second plate to move relative to each other to adapt to the different expansion displacement of the battery cell in different life cycles and to adapt to the expansion requirements of different types of battery cells, but also buffer and absorb the expansion force of the battery cell, improve the fatigue life of the fixed plate, and improve the service life of the battery device.

[0036] In some embodiments, the connecting part is a spring or a hinge.

[0037] In the above-mentioned technical approach, by setting the connecting part as a spring and a hinge, the structure of the connecting part can be simplified, the cost can be reduced, and the assembly can be facilitated, while effectively controlling the relative displacement requirements between the first plate and the second plate along the first direction.

[0038] In some embodiments, the fixing plate is an integrally molded part, and / or the fixing plate is a metal part or a composite fiber material part.

[0039] In the above-mentioned technical approach, the fixing plate is a one-piece molded part, which can reduce the number of parts, simplify the structure of the fixing plate, and facilitate the assembly of the fixing plate with the battery cell assembly and structural beam. The fixing plate is made of metal or composite fiber material, which can ensure the structural strength of the fixing plate, improve the service life of the fixing plate, and ensure the reliability of the connection between the fixing plate and the battery cell assembly and structural beam.

[0040] In some embodiments, the surface of the fixing plate is provided with an insulating layer.

[0041] In the above-mentioned technical method, the surface of the fixing plate is provided with an insulating layer, which can improve the insulation performance between the fixing plate and the battery cell and reduce the risk of short circuit between the fixing plate and the battery cell.

[0042] In some embodiments, there are multiple battery cell assemblies arranged sequentially along the second direction, and there are multiple fixing plates, with at least one fixing plate connected to at least two adjacent battery cell assemblies in the second direction.

[0043] In the above-mentioned technical method, by connecting at least one fixing plate to at least two adjacent battery cell modules in the second direction, one fixing plate can be simultaneously connected between two side-by-side battery cell modules and structural beams. This reduces the number of fixing plates, improves assembly efficiency, and increases the width of a single fixing plate along the second direction, thereby improving the structural strength of the fixing plate and further ensuring the anti-expansion effect on the battery cells.

[0044] In some embodiments, at least one of the structural beams is formed as an intermediate beam, and there are multiple battery cell assemblies arranged on both sides of the intermediate beam in the first direction. The fixing plate connected to the intermediate beam is an intermediate fixing plate, and the two ends of the intermediate fixing plate in the first direction are respectively connected to the battery cell assemblies located on both sides of the intermediate beam.

[0045] In the above-mentioned technical method, by connecting the two ends of the intermediate fixing plate in the first direction to the battery cell assembly located on both sides of the intermediate beam, one fixing plate can connect at least two battery cell assemblies at the same time, thereby fixing multiple battery cell assemblies to the intermediate beam at the same time, which can reduce the number of fixing plates and improve assembly efficiency.

[0046] Secondly, embodiments of this application provide an electrical device, including a battery device according to the first aspect of this application.

[0047] In the above-described technical approach, by incorporating the battery device described in the first aspect, the overall performance of the power-consuming device is improved.

[0048] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of this application; Figure 2 This is an exploded view of a battery device according to an embodiment of this application; Figure 3 yes Figure 2 A top view of the battery device shown; Figure 4 yes Figure 3 A magnified view of point A circled in the image; Figure 5 yes Figure 3 A magnified view of point B circled in the image; Figure 6 yes Figure 3 A magnified view of point C circled in the image; Figure 7 yes Figure 3 A magnified view of point D circled in the image; Figure 8 yes Figure 3 A magnified view of point E circled in the image; Figure 9 yes Figure 3 A magnified view of point F circled in the image; Figure 10 yes Figure 3 A magnified view of point G circled in the image; Figure 11 This is a partial structural schematic diagram of a battery device according to some embodiments of this application; Figure 12 It is along Figure 11 A cross-sectional view of the middle HH line; Figure 13This is a partial structural schematic diagram of a battery device according to other embodiments of this application; Figure 14 It is along Figure 13 Sectional view of line II in the middle.

[0050] Figure label: 1. Electrical appliances; 100. Battery assembly; 200. Controller; 300. Motor; 10. Box body; 101. Receiving cavity; 20. Battery cell assembly; 21. Battery cell; 22. Second positioning part; 30. Structural beam; 30a. Intermediate beam; 31. Second connecting hole; 40. Fixing plate; 40a. First fixing plate; 40b. Second fixing plate; 40c. Third fixing plate; 40d. Fourth fixing plate; 40e. Fifth fixing plate; 40f. Sixth fixing plate; 40g. Seventh fixing plate; 41. First plate portion; 412. First connecting hole; 42. Second plate section; 421. First positioning section; 43. Connecting section; 50. Adhesive components; 60. Connecting components. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0057] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0060] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0061] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0062] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0063] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0064] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0065] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0066] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0067] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0068] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0069] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0070] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0071] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0072] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0073] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0074] In battery device design, structural beams are typically used to mechanically constrain battery cell assemblies to address the volume expansion of individual cells during charging and discharging, preventing short circuits between cells or deformation of the battery cell assembly due to expansion. In existing technologies, a through-type pressure strip (or pressure plate) structure is commonly used. This involves a metal pressure strip extending from one end of the battery cell assembly to the other, with both ends connected to structural beams and the middle fixed to the shoulder of the battery cell using adhesive. This structure has the following problems: First, high safety risks: The long, straight metal strip may puncture the battery cell or its insulation layer, posing a risk of short circuit with the battery cell casing, especially under conditions of battery cell expansion or collision, which can easily lead to insulation failure. Second, high material and cost: The use of a long metal pressure strip (such as aluminum alloy or stainless steel) results in a large amount of material used, leading to high manufacturing and assembly costs. Third, difficult maintenance: If a pressure strip fails or needs replacement, the entire pressure strip assembly, or even the entire battery cell assembly, must be disassembled, resulting in high maintenance costs. Fourth, poor layout flexibility: The long pressure strip structure occupies a large amount of internal space in the battery device, limiting the arrangement of battery cells and thermal management design. Fifth, poor weight reduction effect: The long, straight metal pressure strip is heavy, which is detrimental to the overall vehicle lightweighting.

[0075] Based on the above considerations, in order to reduce material usage, lower costs, and increase the energy density of the battery device, this application designs a battery device in which a fixing plate is arranged on one side of the battery cell assembly in the third direction. Along the first direction, the length of the fixing plate is smaller than the length of the battery cell assembly. The two ends of the fixing plate in the first direction are fixed to the structural beam and the battery cell, respectively. This can ensure the anti-expansion effect of the battery cell, shorten the length of the fixing plate, reduce material usage and weight, lower costs, reduce the space occupied by the fixing plate in the housing, and increase the energy density of the battery device; it can also reduce the contact area between the fixing plate and the battery cell assembly, reducing the risk of insulation failure of the battery cell.

[0076] This application provides an electrical device that uses the battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1 and the battery device 100 of this application in detail.

[0078] Please refer to Figure 1 , Figure 1 The electrical device 1 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0079] The following is for reference. Figures 2-14 A battery device 100 according to an embodiment of the first aspect of this application is described.

[0080] Please refer to Figure 2 and Figure 3 This application provides a battery device 100, which includes: a housing 10, a battery cell assembly 20, a structural beam 30, and a fixing plate 40. The housing 10 has a receiving cavity 101; the battery cell assembly 20 is disposed within the receiving cavity 101 and includes a first direction (e.g., along a first direction). Figure 3 Multiple battery cells 21 stacked in the X direction (as shown); structural beam 30 along the second direction (e.g., in the X direction); Figure 3 The mounting plate 40 extends and is fixed to the housing 10 in the Y direction shown, and is arranged on at least one side of the battery cell assembly 20 in the first direction; the mounting plate 40 is arranged on the battery cell assembly 20 in a third direction (e.g., in the Y direction shown). Figure 2 On one side of the Z direction (as shown), the first direction, the second direction and the third direction intersect each other but are not coplanar. Along the first direction, the length of the fixing plate 40 is smaller than the length of the battery cell assembly 20. The two ends of the fixing plate 40 in the first direction are fixed to the structural beam 30 and the battery cell 21, respectively.

[0081] In this context, the first direction, the second direction, and the third direction intersect each other and are not coplanar, meaning that any two of the first, second, and third directions are not parallel, and any two of the first, second, and third directions are arranged at an angle. For example, the angle between any two of the first, second, and third directions can be 30°, 45°, 60°, 80°, or 90°, etc. In some specific examples, the first, second, and third directions are perpendicular to each other. In one specific example, the first direction is the length direction of the battery device 100, the second direction is the width direction of the battery device 100, and the third direction is the height direction of the battery device 100.

[0082] In some examples, the housing 10 provides assembly space for battery cells 21, which are housed within the housing 10. The housing 10 may include a main body and a cover (not shown), the main body defining a top-open receiving cavity 101, the cover sealing the top of the main body, the main body including a frame beam and a bottom plate, the frame beam being rectangular in shape, the bottom plate sealing the bottom of the frame beam, and the cover sealing the top of the frame beam.

[0083] In some examples, the number of battery cell assemblies 20 can be one or more. For example, the battery device 100 may include one, two, three, four, six, eight or more battery cell assemblies 20, each battery cell assembly 20 including two, three, five, eight, ten, fifteen, twenty or more battery cells 21, and the multiple battery cells 21 in the battery cell assembly 20 are stacked in a direction perpendicular to the large surface of the battery cell 21.

[0084] In some examples, the structural beam 30 is fixed inside the housing 10. The two ends of the structural beam 30 in the second direction are fixed to the housing body, and the side of the structural beam 30 facing away from the housing cover in the third direction is fixed to the housing body. In some examples, the structural beam 30 may be arranged only on one side of the battery cell assembly 20 in the first direction, or it may be arranged on both sides of the battery cell assembly 20 in the first direction. For example, there may be one structural beam 30, in which case the battery cell assembly 20 is located between the structural beam 30 and the inner wall of the receiving cavity 101; there may also be two structural beams 30, which may be arranged on both sides of the battery cell assembly 20 in the first direction; there may also be three or more structural beams 30, where two structural beams 30 are arranged on both sides of multiple battery cell assemblies 20 in the first direction, and the remaining structural beams 30 are intermediate beams 30a arranged between multiple battery cell assemblies 20.

[0085] In some examples, a fixing plate 40 is arranged on the side of the battery cell assembly 20 facing the cover in the third-order direction. The fixing plate 40 can be plate-shaped or strip-shaped. For example, the fixing plate 40 can be a solid thin plate or a thick plate with a cavity. The fixing plate 40 is used to fix the structural beam 30 and the battery cell assembly 20, thereby fixing their positions. By setting the fixing plate 40 and fixing both ends of the fixing plate 40 to the structural beam 30 and the battery cell 21 respectively, when the battery cell 21 in the battery cell assembly 20 expands, the fixing plate 40 can increase the stiffness of the structural beam 30, limit the deformation of the structural beam 30, and thus limit the expansion of the battery cell 21 in the battery cell assembly 20, improving the anti-expansion effect.

[0086] In some examples, such as Figure 3 As shown, the length L1 of the fixing plate 40 along the first direction is smaller than the length L2 of the battery cell assembly 20 along the first direction. For example, the length L1 of the fixing plate 40 along the first direction can be 20%, 40%, 60%, or 80% of the length L2 of the battery cell assembly 20 along the first direction. Compared to the prior art where the pressure strip extends from one end of the battery cell assembly 20 to the other, with both ends of the pressure strip connected to two expansion beams located on both sides of the battery cell assembly 20, resulting in a longer pressure strip and more material usage. In this embodiment, the length of the fixing plate 40 is less than the length of the battery cell assembly 20. The fixing plate 40 does not need to span the entire length of the battery cell assembly 20, nor does it need to simultaneously connect the two expansion beams on both sides of the battery cell assembly 20. Therefore, while ensuring the anti-expansion effect on the battery cell 21, the length of the fixing plate 40 can be shortened, reducing the amount of material used, lowering material costs, reducing the weight of the fixing plate 40, and reducing the space occupied by the fixing plate 40 within the housing 10, thereby increasing the energy density of the battery device 100. Simultaneously, because the fixing plate 40 is shorter, the contact area between the fixing plate 40 and the battery cell assembly 20 can be reduced, decreasing the probability of the fixing plate 40 piercing the insulation layer of the battery cell 21, reducing the risk of insulation failure of the battery cell 21, and reducing the risk of a short circuit between the fixing plate 40 and the housing of the battery cell 21. Furthermore, because the fixing plate 40 occupies less space within the housing 10, its impact on the layout of the thermal management module within the housing 10 can be reduced, improving the layout flexibility of the thermal management module.

[0087] In the above technical solution, by setting a fixing plate 40 such that the length of the fixing plate 40 along the first direction is less than the length of the battery cell assembly 20, and fixing both ends of the fixing plate 40 to the structural beam 30 and the battery cell 21 respectively, the anti-expansion effect of the battery cell 21 can be guaranteed. It can also shorten the length of the fixing plate 40, reduce the amount of material used and weight, reduce costs, reduce the space occupied by the fixing plate 40 in the housing 10, and improve the energy density of the battery device 100. It can also reduce the contact area between the fixing plate 40 and the battery cell assembly 20, and reduce the risk of insulation failure of the battery cell 21.

[0088] In some embodiments of this application, such as Figure 3 As shown, along the first direction, the overlap length between the fixing plate 40 and the battery cell assembly 20 is less than or equal to half the length of the battery cell assembly 20; and / or, along the first direction, the fixing plate 40 is fixedly connected to at least two battery cells 21 in the battery cell assembly 20.

[0089] In other words, along the first direction, the length of the fixing plate 40 extending on the surface of the battery cell assembly 20 in the third direction does not exceed half the total length of the battery cell assembly 20. For example, the ratio of the overlap length between the fixing plate 40 and the battery cell assembly 20 along the first direction to the length of the battery cell assembly 20 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5. Therefore, while ensuring the anti-expansion effect on the battery cell 21, the length of the fixing plate 40 can be further shortened, reducing material usage, lowering material costs, reducing weight, reducing the space occupied by the fixing plate 40 within the housing 10, and increasing the energy density of the battery device 100. Furthermore, the contact area between the fixing plate 40 and the battery cell assembly 20 can be further reduced, further reducing the probability of the fixing plate 40 piercing the insulation layer of the battery cell 21, and further reducing the risk of insulation failure of the battery cell 21.

[0090] In some examples, such as Figures 4-10 As shown, along the first direction, the fixing plate 40 can be connected to two, three, four, five, six, or seven battery cells 21 in the battery cell assembly 20. The fixing plate 40 and the battery cells 21 can be bonded together. By connecting the fixing plate 40 to at least two battery cells 21, sufficient connection area between the fixing plate 40 and the battery cell assembly 20 can be ensured, improving the connection strength and reliability between the fixing plate 40 and the battery cell assembly 20, and guaranteeing the anti-expansion effect of the fixing plate 40 on the battery cells 21.

[0091] In the above technical solution, by making the overlap length between the fixing plate 40 and the battery cell assembly 20 along the first direction less than or equal to half the length of the battery cell assembly 20, the length of the fixing plate 40 can be further shortened while ensuring the anti-expansion effect on the battery cell 21. This reduces material usage and material costs, further reduces the contact area between the fixing plate 40 and the battery cell assembly 20, and lowers the risk of insulation failure of the battery cell 21. By fixing the fixing plate 40 to at least two battery cells 21 in the battery cell assembly 20, sufficient connection area can be ensured between the fixing plate 40 and the battery cell assembly 20, improving the connection strength and reliability between the fixing plate 40 and the battery cell assembly 20, and ensuring the anti-expansion effect of the fixing plate 40 on the battery cell 21.

[0092] In some embodiments of this application, such as Figure 11 and Figure 12 As shown, the fixing plate 40 is bonded to the housing of the battery cell 21 by the adhesive 50.

[0093] It should be noted that one end of the fixing plate 40 is fixed to the structural beam 30, and the other end of the fixing plate 40 is bonded to the shell of the battery cell 21 via the adhesive member 50. When the battery cell 21 expands, the fixing plate 40 generates a tensile force along the first direction between the battery cell 21 and the structural beam 30 to resist the expansion force of the battery cell 21. Since the fixing plate 40 is bonded to the shell of the battery cell 21, the maximum tensile force that the bonding point between the fixing plate 40 and the battery cell 21 can withstand along the first direction is equal to the shear strength of the adhesive member 50 multiplied by the bonding area. In other words, this application uses the adhesive tensile force of the adhesive member 50 to resist the expansion force of the battery cell 21 borne by the structural beam 30.

[0094] In some examples, the fixing plate 40 can be bonded to the shoulder position of the housing of the battery cell 21, wherein the shoulder position of the housing refers to the portion of the housing wall of the battery cell 21 facing the fixing plate 40 in the third direction at both ends in the second direction. For example, the housing has two poles arranged at intervals in the second direction on the side wall of the housing facing the fixing plate 40 in the third direction, and the shoulder position of the housing is located on the two poles opposite to each other in the second direction.

[0095] In the above technical solution, since the fixing plate 40 and the housing of the battery cell 21 are bonded together by the adhesive 50, the number of parts can be reduced, the assembly process of the fixing plate 40 and the battery cell 21 can be simplified, and the assembly efficiency can be improved while ensuring the reliability of the connection between the fixing plate 40 and the battery cell 21.

[0096] In some embodiments of this application, such as Figure 12As shown, the shear strength of the adhesive 50 is greater than the allowable tensile stress of the fixing plate 40.

[0097] In some examples, the shear strength of the adhesive 50 can be greater than or equal to 6 MPa. Alternatively, a two-component polyurethane structural adhesive with a shear strength greater than or equal to 9 MPa can be used.

[0098] In the above technical solution, by making the shear strength of the adhesive 50 greater than the allowable tensile stress of the fixing plate 40, when the connection position between the fixing plate 40 and the battery cell 21 is under large stress or extreme stress conditions, the fixing plate 40 can reach the stress limit and yield or fail before the adhesive 50. Thus, the probability of the fixing plate 40 failing due to the bonding interface cracking and delamination first can be reduced, effectively ensuring the connection reliability between the battery cell 21 and the fixing plate 40.

[0099] It should be noted that increasing the bonding area between the battery cell 21 and the fixing plate 40 can improve the shear strength between the fixing plate 40 and the battery cell 21. Thus, while ensuring that the connection strength between the fixing plate 40 and the battery cell 21 meets the normal anti-expansion requirements, by increasing the number of battery cells 21 bonded to the fixing plate 40, the shear strength between the fixing plate 40 and the battery cell assembly 20 can be further improved. This achieves a safe redundancy design for the bonding connection between the fixing plate 40 and the battery cell assembly 20, further reducing the risk of structural collapse caused by the failure of the bonding component 50.

[0100] In some embodiments of this application, such as Figure 12 As shown, the adhesive component 50 is a structural adhesive or a foam adhesive.

[0101] In other words, the fixing plate 40 can be bonded to the casing of the battery cell 21 by structural adhesive, or the fixing plate 40 can be bonded to the casing of the battery cell 21 by foam adhesive.

[0102] In some examples, refer to Figure 12 Adhesive 50 in a third party (e.g.) Figure 12 The thickness in the Z direction (as shown) is 1mm-3mm. For example, the thickness of the adhesive 50 in the third direction can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm or 3mm.

[0103] In the above technical solution, by setting the adhesive 50 as structural adhesive, the bonding strength between the fixing plate 40 and the battery cell 21 can be further guaranteed, and the connection reliability can be improved. By setting the adhesive 50 as foam adhesive, the foam adhesive can play a buffering and energy-absorbing role between the fixing plate 40 and the battery cell 21, absorbing the expansion stress of the battery cell 21, reducing the rigid impact on the connection position, and improving the service life of the connection position.

[0104] It should be noted that when the anti-expansion requirement of the battery cell assembly 20 is relatively high, for example, when the design expansion stress of the battery cell assembly 20 is greater than the preset stress threshold, the fixing plate 40 and the battery cell assembly 20 are bonded together by structural adhesive. When the anti-expansion requirement of the battery cell assembly 20 is relatively low, for example, when the design expansion stress of the battery cell assembly 20 is less than the preset stress threshold, the fixing plate 40 and the battery cell assembly 20 are bonded together by foam adhesive.

[0105] In some embodiments of this application, reference is made to Figure 12 The battery device 100 also includes a buffer (not shown), which is disposed between the fixing plate 40 and the battery cell 21.

[0106] In some examples, the buffer is a structural component with certain buffering performance. The buffer can be an elastic buffer pad, for example, a silicone or polyurethane material component. The fixing plate 40, the buffer and the battery cell 21 are arranged sequentially along the third direction.

[0107] In the above technical solution, by placing the buffer between the fixing plate 40 and the battery cell 21, the buffer can absorb and disperse the expansion stress generated by the battery cell 21 in the battery cell assembly 20, reduce the risk of local overload of the adhesive 50, and thus extend the service life of the adhesive 50.

[0108] In some embodiments of this application, the buffer and the adhesive 50 are stacked in the third direction, or the buffer and the battery cell 21 cooperate to form a glue-filling groove, and the adhesive 50 fills the glue-filling groove.

[0109] In some examples, the fixing plate 40, the buffer, the adhesive 50, and the housing of the battery cell 21 are arranged and connected in sequence along a third direction, or the fixing plate 40, the adhesive 50, the buffer, and the housing of the battery cell 21 are arranged and connected in sequence along a third direction.

[0110] In some examples, the buffer may include multiple adhesive strips connected end-to-end in a ring, defining adhesive-receiving grooves on their inner sides. In some examples, the buffer may be formed in a grid shape, defining multiple spaced adhesive-receiving grooves.

[0111] During the bonding process between the fixing plate 40 and the battery cell assembly 20, a buffer can be placed on the housing of the battery cell 21, and then a fluid adhesive 50 is injected into the adhesive reservoir. The fixing plate 40, the buffer, and the adhesive 50 are then pressed together and held until the structural adhesive cures, thus completing the bonding connection between the fixing plate 40 and the battery cell 21.

[0112] In the above technical solution, by stacking the buffer and the adhesive 50, the absorption and dispersion effect of the buffer on the expansion stress of the battery cell 21 can be improved, thereby increasing the service life of the battery device 100. By defining the adhesive groove by the buffer and filling the adhesive 50 in the adhesive groove, the amount and thickness of the adhesive 50 can be accurately controlled, reducing the amount of adhesive overflow and lowering the risk of adhesive overflow. Thus, the buffer can not only buffer and disperse stress, but also improve the bonding efficiency and bonding quality between the fixing plate 40 and the battery cell 21.

[0113] In some embodiments of this application, such as Figure 13 and Figure 14 As shown, the fixing plate 40 is provided with a first positioning part 421, and the battery cell assembly 20 is provided with a second positioning part 22. The first positioning part 421 and the second positioning part 22 are positioned and cooperated to position the relative positions of the fixing plate 40 and the battery cell assembly 20.

[0114] In some examples, the first positioning part 421 may be a positioning protrusion, a positioning groove, a positioning hole and / or a positioning post, and the second positioning part 22 may be a positioning groove, a positioning protrusion, a positioning hole and / or a positioning post that is adapted to the shape of the first positioning part 421.

[0115] In the above technical solution, the first positioning part 421 and the second positioning part 22 are positioned and cooperated to position the relative position of the fixing plate 40 and the battery cell assembly 20. During the assembly process, the fixing plate 40 and the battery cell assembly 20 can be positioned quickly and accurately, thereby improving assembly efficiency and assembly accuracy and reducing the risk of uneven clamping caused by misalignment of the fixing plate 40 and the battery cell assembly 20.

[0116] In some embodiments of this application, such as Figure 14 As shown, the second positioning part 22 is formed as a positioning hole or positioning groove; and / or, the second positioning part 22 is formed on the housing of the battery cell 21, or, two adjacent battery cells 21 cooperate to define the second positioning part 22.

[0117] In some examples, the second positioning part 22 is formed as a positioning hole or positioning groove, and the first positioning part 421 is formed as a positioning post or positioning protrusion, which fits into the positioning hole or positioning groove.

[0118] In some examples, the second positioning part 22 can be directly formed on the housing of the battery cell 21. For example, the housing of the battery cell 21 can be recessed to form a positioning groove. Or, the housing of the battery cell 21 is provided with a boss, and a positioning groove is formed on the boss. Or, the housing of the battery cell 21 is provided with two positioning ribs arranged at intervals, and the two positioning ribs cooperate to define the positioning groove.

[0119] In some examples, along the first direction, the housings of two adjacent battery cells 21 are arranged at intervals along the first direction, and a gap is formed between the two housings. This gap is formed as a second positioning part 22, and the first positioning part 421 on the fixing plate 40 can extend into the gap.

[0120] In the above technical solution, by forming the second positioning part 22 as a positioning hole or positioning groove, the structure of the second positioning part 22 can be simplified, and it is convenient to process and manufacture. By setting the second positioning part 22 on the housing of the battery cell 21, the positioning accuracy of the fixing plate 40 can be further improved, and the assembly accuracy can be improved. By defining the second positioning part 22 by the cooperation of two adjacent battery cells 21, the fixing plate 40 can be effectively positioned without processing the housing of the battery cell 21, thereby improving the positioning efficiency and simplifying the structure.

[0121] In some embodiments of this application, such as Figures 11-14 As shown, the fixing plate 40 is connected to the structural beam 30 by bolts, rivets, welding, or clips.

[0122] In some examples, such as Figure 2 and Figure 12 As shown, the fixing plate 40 may be provided with a first connecting hole 412, and the structural beam 30 may be provided with a second connecting hole 31. The battery device 100 also includes a connector 60, which can be a bolt. A rivet nut is embedded in the structural beam 30. The connecting bolt passes through the first connecting hole 412 and the second connecting hole 31 and is fastened to the rivet nut. Alternatively, the connector 60 can be a rivet. After the rivet passes through the first connecting hole 412 and the second connecting hole 31, it rivets the fixing plate 40 to the structural beam 30.

[0123] In some examples, the fixing plate 40 is provided with a buckle, and the structural beam 30 is provided with a slot. The buckle fits into the slot to realize the snap-fit ​​connection between the fixing plate 40 and the structural beam 30.

[0124] In the above technical solution, by bolting, riveting or welding the fixing plate 40 to the structural beam 30, the connection strength between the fixing plate 40 and the structural beam 30 can be improved, and the connection reliability can be improved. By snapping the fixing plate 40 to the structural beam 30, the quick installation and disassembly between the fixing plate 40 and the structural beam 30 can be facilitated, thereby improving the assembly efficiency, production efficiency, and facilitating the maintenance and replacement of the fixing plate 40.

[0125] In some embodiments of this application, such as Figure 2 , Figure 12 and Figure 14 As shown, a portion of the fixing plate 40 is formed as a connecting area, and the connecting area has a first connecting hole 412. The structural beam 30 is provided with a second connecting hole 31. The connecting area is fixedly connected to the structural beam 30 through the first connecting hole 412 and the second connecting hole 31 via a connector 60. The structural strength of the connecting area is greater than the structural strength of the rest of the fixing plate 40.

[0126] For example, the fixing plate 40 includes a first plate portion 41 and a second plate portion 42. The first plate portion 41 is connected to the structural beam 30, and the second plate portion 42 is connected to the battery cell assembly 20. At least a portion of the first plate portion 41 is formed as a connection area; that is, the first plate portion 41 can be formed as a connection area in only a part or in its entirety. When only a portion of the first plate portion 41 is formed as a connection area, there can be one or more connection areas, arranged at intervals. Each connection area has at least one first connection hole 412. The structural strength of the connection area can be greater than the structural strength of the remaining portion of the first plate portion 41, and the structural strength of the connection area is greater than the structural strength of the second plate portion 42.

[0127] In some examples, the thickness of the connection area can be set to be greater than the thickness of the rest of the fixed plate 40. Reinforcing structures can also be set in the connection area to enhance its structural strength. Alternatively, the material of the connection area can be selected to have higher structural strength than the rest of the area.

[0128] In the above technical solution, by setting the structural strength of the connection area forming the first connection hole 412 to be greater than the structural strength of the rest of the fixing plate 40, the risk of breakage at the connection area can be reduced when the battery cell assembly 20 expands and deforms, thereby improving the service life of the fixing plate 40.

[0129] In some embodiments of this application, reference is made to Figure 12 and Figure 14 As shown, the connecting area is equipped with a reinforcing structure.

[0130] In some examples, the reinforcing structure can be a reinforcing rib, a reinforcing plate, or a reinforcing boss, etc.

[0131] In some examples, the connecting area may be provided with a reinforcing boss, and the first connecting hole 412 passes through the reinforcing boss; the connecting area may also be provided with a reinforcing pad, which extends in a ring shape along the circumference of the first connecting hole 412.

[0132] In some examples, the connection area can be a carbon fiber reinforced resin composite part or a glass fiber reinforced polymer composite part.

[0133] In the above technical solution, by setting a reinforcing structure in the connection area, the structural stiffness and tensile and shear resistance of the connection area can be improved, the risk of stress concentration, cracking and deformation around the first connection hole 412 can be reduced, and the stability, reliability and service life of the connection position can be improved.

[0134] In some embodiments of this application, such as Figures 11-14 As shown, the fixing plate 40 includes: a first plate portion 41 and a second plate portion 42. The first plate portion 41 extends along the second direction into a long strip plate and is fixed to the structural beam 30. The second plate portion 42 is connected to at least one side of the first plate portion 41 in the first direction and extends along the first direction. The second plate portion 42 is fixed to the battery cell 21.

[0135] In some examples, the first plate portion 41 can be a solid plate extending along the second direction, or it can be a hollow plate with a cavity. The two side edges of the first plate portion 41 in the first direction are substantially flush with the two side edges of the structural beam 30 in the first direction, respectively. In some examples, the first plate portion 41 and the structural beam 30 can be detachably or non-detachably connected. When the first plate portion 41 and the structural beam 30 are non-detachably connected, they can be welded or bonded with structural adhesive. When the first plate portion 41 and the structural beam 30 are detachably connected, they can be bolted or snap-fitted together.

[0136] In some examples, the second plate portion 42 is a plate shape extending along the first and second directions. The second plate portion 42 can be a solid plate or a hollow plate with a cavity.

[0137] In some examples, the fixing plate 40 includes a first plate portion 41 and at least one second plate portion 42. When there are multiple second plate portions 42, the multiple second plate portions 42 can be connected to the same side of the first plate portion 41 in a first direction, or the multiple second plate portions 42 can be connected to opposite sides of the first plate portion 41 in the first direction. The second plate portions 42 can be fixed to multiple battery cells 21 in a battery cell assembly 20.

[0138] In the above technical solution, by extending the first plate portion 41 into a long strip plate along the second direction, the connection area between the first plate portion 41 and the structural beam 30 can be increased, and the connection reliability between the fixed beam and the first plate portion 41 can be enhanced. By setting the second plate portion 42, it is convenient to overlap and connect with the battery cell assembly 20, which facilitates the assembly between the fixed plate 40 and the battery cell assembly 20 and improves the assembly efficiency. In addition, the length of the second plate portion 42 can be adjusted according to the connection strength requirements between the second plate portion 42 and the battery cell assembly 20 to improve the applicability of the fixed plate 40.

[0139] In some embodiments of this application, such as Figure 5 and Figure 8 As shown, along the second direction, the end edges of both ends of the first plate portion 41 are flush with the end edges of both ends of the second plate portion 42; or, as... Figure 4 , Figure 6 , Figure 7 and Figure 9 As shown, the length dimension of the first plate portion 41 along the second direction is greater than the width dimension of the second plate portion 42 along the second direction.

[0140] In some examples, when the end edges of the first plate portion 41 and the second plate portion 42 are flush with each other in the second direction, if the first plate portion 41 and the second plate portion 42 are integrally formed or directly connected as one piece, the fixing plate 40 is generally rectangular, which simplifies the structure of the fixing plate 40, facilitates the processing and manufacturing of the fixing plate 40, and improves production efficiency.

[0141] In some examples, the length of the first plate portion 41 along the second direction is greater than the width of the second plate portion 42 along the second direction. One edge of the first plate portion 41 in the second direction may be flush with one edge of the second plate portion 42 in the second direction. In this case, the first plate portion 41 and the second plate portion 42 can be connected in an L-shape, such as... Figure 4 As shown; furthermore, the two side edges of the first plate portion 41 in the second direction may not be flush with the two side edges of the second plate portion 42, and the second plate portion 42 is located between the two side edges of the first plate portion 41. In this case, the fixing plate 40 formed by connecting the first plate portion 41 and the second plate portion 42 can be T-shaped, such as... Figure 6 As shown; when a second plate portion 42 is connected to both sides of the first plate portion 41, the fixing plate 40 formed by the first plate portion 41 and the two second plate portions 42 can be cross-shaped, as shown. Figure 9 As shown.

[0142] In the above technical solution, by aligning the end edges of the first plate portion 41 and the second plate portion 42 at both ends in the second direction, the structure of the fixing plate 40 can be simplified, the processing of the fixing plate 40 can be facilitated, and the production efficiency can be improved. By making the length of the first plate portion 41 in the second direction greater than the dimension of the second plate portion 42 in the second direction, the connection contact area between the first plate portion 41 and the structural beam 30 can be increased, thereby improving the connection reliability between the fixing beam and the first plate portion 41.

[0143] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, a second plate portion 42 is connected to one side of the first plate portion 41 in the first direction, and the second plate portion 42 is connected to the middle position of the first plate portion 41 in the second direction, or, as... Figure 4 As shown, the second plate portion 42 is connected to one end of the first plate portion 41 in the second direction; or, as... Figure 10 As shown, a plurality of second plate portions 42 are connected to one side of the first plate portion 41 in the first direction, and the plurality of second plate portions 42 are arranged at intervals along the second direction.

[0144] In some examples, such as Figure 6 As shown, a second plate portion 42 can be connected to the middle position of one side of the first plate portion 41 in the first direction. In this case, the fixing plate 40 is T-shaped; as Figure 9 As shown, the first plate portion 41 can also be connected to a second plate portion 42 at the middle position on each side in the first direction, in which case the fixing plate 40 is cross-shaped. By connecting the second plate portion 42 to the middle position of the first plate portion 41, the fixing plate 40 can be arranged approximately symmetrically about the center line along the first direction, thereby improving the uniformity of force on the fixing plate 40 along the second direction and reducing the risk of stress concentration.

[0145] In some examples, the second plate portion 42 is connected to one end of the first plate portion 41, which can make the fixing plate 40 L-shaped. In this case, the fixing plate 40 can be conveniently arranged at the corner position where the structural beam 30 is connected to the side wall of the box 10. While achieving the effect of improving the anti-expansion function of the battery cell assembly 20, the risk of interference between the fixing plate 40 and the box 10 or other components inside the box 10 is reduced.

[0146] In some examples, two, three, four, or more second plates 42 can be connected to one side of the first plate portion 41 in the first direction. The multiple second plates 42 are spaced apart along the second direction, and two of the second plates 42 are flush with the end edges of the first plate portion 41 at both ends in the second direction. Two adjacent second plates 42 can be respectively arranged at both ends of the battery cell assembly 20 in the second direction and fixedly connected to both ends of the battery cell assembly 20. Further, at least one second plate portion 42 is simultaneously connected to two adjacent battery cell assemblies 20 arranged in the second direction. This embodiment, by connecting multiple second plates 42 to the first plate portion 41, can reduce the number of parts, improve assembly efficiency, and further enhance the structural strength of the expansion beam, thereby improving the anti-expansion effect on the battery cell assembly 20.

[0147] In the above technical solution, by connecting the second plate portion 42 to the middle position of the first plate portion 41, the uniformity of force on the fixing plate 40 along the second direction can be improved; by connecting the second plate portion 42 to the end of one end of the first plate portion 41, the fixing plate 40 can be conveniently arranged at the corner position where the structural beam 30 connects to the side wall of the box body 10, reducing the risk of interference between the fixing plate 40 and the box body 10; by providing multiple second plate portions 42 on one side of the first plate portion 41, the number of parts can be reduced, and the assembly efficiency and anti-expansion effect can be improved.

[0148] In some embodiments of this application, such as Figure 13 and Figure 14 As shown, the fixing plate 40 also includes a connecting part 43, through which the first plate part 41 and the second plate part 42 are connected, and the connecting part 43 is configured to allow relative displacement between the first plate part and the second plate part.

[0149] In some examples, the connecting part 43 can be a flexible component, that is, the connecting part 43 is a structure that can undergo flexible deformation. In other examples, the connecting part 43 can be an elastic structure that can be elastically deformed, and the connecting part 43 can also be a hinged structure that can be rotatably connected or a corrugated structure that can be stretched.

[0150] In the above technical solution, since the first plate 41 and the second plate 42 are connected by the connecting part 43, the connecting part allows the first plate 41 and the second plate 42 to undergo relative displacement. When the battery cell 21 expands, the connecting part 43 can not only allow the first plate 41 and the second plate 42 to undergo a certain degree of relative position to adapt to the different expansion displacement of the battery cell 21 in different life cycles and adapt to the expansion requirements of different models of battery cells 21, but also buffer and absorb the expansion force of the battery cell 21, improve the fatigue life of the fixing plate 40, and improve the service life of the battery device 100.

[0151] In some embodiments of this application, such as Figure 14 As shown, the connecting part 43 is a spring or a hinge.

[0152] In some examples, the connecting part 43 is a spring that can elastically deform along a first direction. The first plate part 41 and the second plate part 42 are connected by one or more springs. When there are multiple springs, they can be arranged sequentially along a second direction. The deformation range of the springs can be specifically set according to the expansion design requirements of the battery cell assembly 20.

[0153] In some examples, the connecting part 43 is a hinge. For example, the first plate part 41 and the second plate part 42 are connected by a hinge. In this case, the first plate part 41 and the second plate part 42 can rotate relative to each other within a preset range through the hinge, so that the first plate part 41 and the second plate part 42 can move relative to each other within a preset range along the first direction, so as to adapt to the different expansion displacement requirements of the battery cell 21 in different life cycles and to adapt to the expansion requirements of different models of battery cells 21.

[0154] In the above technical solution, by setting the connecting part 43 as a spring and a hinge, the structure of the connecting part 43 can be simplified, the cost can be reduced, and the assembly can be facilitated, while effectively controlling the relative displacement requirements between the first plate part 41 and the second plate body along the first direction.

[0155] In some embodiments of this application, such as Figures 4-10 As shown, the fixing plate 40 is a one-piece molded part, and / or the fixing plate 40 is a metal part or a composite fiber material part.

[0156] In some examples, the fixing plate 40 can be made of steel or aluminum, or it can be made of carbon fiber reinforced resin composite or glass fiber reinforced polymer composite.

[0157] In the above technical solution, the fixing plate 40 is an integrally molded part, which can reduce the number of parts, simplify the structure of the fixing plate 40, and facilitate the assembly of the fixing plate 40 with the battery cell assembly 20 and the structural beam 30. By making the fixing plate 40 a metal part or a composite fiber material part, the structural strength of the fixing plate 40 can be guaranteed, the service life of the fixing plate 40 can be improved, and the connection reliability of the fixing plate 40 between the battery cell assembly 20 and the structural beam 30 can be guaranteed.

[0158] In some embodiments of this application, the surface of the fixing plate 40 is provided with an insulating layer.

[0159] For example, the fixing plate 40 is a metal part, and the surface of the fixing plate 40 is provided with an insulating layer, wherein the insulating layer can be an insulating coating or an insulating film. In some examples, the fixing plate 40 may only have an insulating layer on the side of the surface facing the battery cell 21, or the fixing plate 40 may have an insulating layer on all surfaces.

[0160] In the above technical solution, the surface of the fixing plate 40 is provided with an insulating layer, which can improve the insulation performance between the fixing plate 40 and the battery cell 21 and reduce the risk of short circuit between the fixing plate 40 and the battery cell 21.

[0161] In some embodiments of this application, such as Figure 3 As shown, there are multiple battery cell assemblies 20 arranged sequentially along the second direction, and multiple fixing plates 40, with at least one fixing plate 40 connected to at least two adjacent battery cell assemblies 20 in the second direction.

[0162] In some examples, the number of battery cell modules 20 can be two, four, six, eight, ten, or more. Multiple battery cell modules 20 can be arranged sequentially along a first direction and / or a second direction, for example... Figure 3 As shown, there are eight battery cell modules 20, which are arranged in two rows spaced apart along a first direction, with each row including four battery cell modules 20 arranged in a second reverse direction.

[0163] In some examples, among the multiple fixing plates 40, only one or a portion of the fixing plates 40 may be connected to at least two adjacent battery cell assemblies 20 in the second direction, or all fixing plates 40 may be connected to at least two adjacent battery cell assemblies 20 in the second direction; a fixing plate 40 may be simultaneously connected to two, three, or four or more adjacent battery cell assemblies 20 in the second direction.

[0164] like Figure 3 As shown, the first fixing plate 40a is connected to only one battery cell assembly 20, the second fixing plate 40b and the third fixing plate 40c are both connected to two battery cell assemblies 20 arranged side by side in the second direction, and the seventh fixing plate 40g is connected to four battery cell assemblies 20 arranged adjacent to each other in the second direction.

[0165] In the above technical solution, by connecting at least one fixing plate 40 to at least two adjacent battery cell assemblies 20 in the second direction, one fixing plate 40 can be simultaneously connected between two parallel battery cell assemblies 20 and the structural beam 30. This reduces the number of fixing plates 40, improves assembly efficiency, and increases the width of a single fixing plate 40 along the second direction, thereby improving the structural strength of the fixing plate 40 and further ensuring the anti-expansion effect on the battery cell 21.

[0166] In some embodiments of this application, such as Figure 3As shown, at least one structural beam 30 is formed as an intermediate beam 30a, and there are multiple battery cell modules 20 arranged on both sides of the intermediate beam 30a in a first direction. The fixing plate 40 connected to the intermediate beam 30a is an intermediate fixing plate 40 (e.g., Figure 3 The fourth fixing plate 40d, the fifth fixing plate 40e, and the sixth fixing plate 40f shown in the figure are respectively connected to the battery cell assembly 20 located on both sides of the intermediate beam 30a at both ends of the intermediate fixing plate 40 in the first direction.

[0167] In some examples, there are multiple structural beams 30, which extend along a second direction and are spaced apart in a first direction. The two outermost structural beams 30 located at both ends of the housing 10 in the first direction are called outer beams, and the structural beam 30 located between the two outer beams is called an intermediate beam 30a. Multiple battery cell modules 20 are arranged between two adjacent structural beams 30. Alternatively, only one battery cell module 20 may be placed between two adjacent structural beams 30, or multiple battery cell modules 20 may be arranged sequentially along the second direction.

[0168] like Figure 3 As shown, the fourth fixing plate 40d, the fifth fixing plate 40e, and the sixth fixing plate 40f each include a first plate portion 41 and two second plate portions 42. The first plate portion 41 is fixedly connected to the intermediate beam 30a. The two second plate portions 42 are symmetrically arranged on both sides of the first plate portion 41 in the first direction and are respectively connected to the battery cell assembly 20 located on both sides of the intermediate beam 30a. Specifically, the two second plate portions 42 of the fourth fixing plate 40d are each connected to one battery cell assembly 20, and the second plate portions 42 of the fifth fixing plate 40e and the sixth fixing plate 40f are each connected to two battery cell assemblies 20 arranged side by side in the second direction. That is, the fifth fixing plate 40e and the sixth fixing plate 40f are both fixedly connected to four battery cell assemblies 20.

[0169] In the above technical solution, by connecting the two ends of the intermediate fixing plate 40 in the first direction to the battery cell assembly 20 located on both sides of the intermediate beam 30a, one fixing plate 40 can connect at least two battery cell assemblies 20 at the same time, thereby fixing multiple battery cell assemblies 20 to the intermediate beam 30a at the same time, thereby reducing the number of fixing plates 40 and improving assembly efficiency.

[0170] Secondly, embodiments of this application also provide an electrical device 1, including the battery device 100 of any of the above embodiments.

[0171] In the above technical solution, since the power-consuming device 1 is equipped with the battery device 100, the battery device 100 is equipped with a fixing plate 40, the length of the fixing plate 40 along the first direction is less than the length of the battery cell assembly 20, and the two ends of the fixing plate 40 are fixed to the structural beam 30 and the battery cell 21 respectively. This can ensure the anti-expansion effect of the battery cell 21, shorten the length of the fixing plate 40, reduce the amount of material used and weight, reduce the cost, reduce the space occupied by the fixing plate 40 in the housing 10, and improve the energy density of the battery device 100; it can also reduce the contact area between the fixing plate 40 and the battery cell assembly 20, reduce the risk of insulation failure of the battery cell 21, thereby improving the overall performance of the power-consuming device 1.

[0172] The following will refer to Figures 1-14 This application describes a battery device 100 according to two specific embodiments.

[0173] Example 1, refer to Figure 2 and Figure 3 The battery device 100 includes: a housing 10, multiple structural beams 30, multiple battery cell assemblies 20, and multiple fixing plates 40.

[0174] like Figure 2 and Figure 3 As shown, the housing 10 has a cuboid structure and includes a main body and a lid. The main body defines an open-top receiving cavity 101, and the lid covers the top of the main body. There are three structural beams 30, extending along the width of the housing 10 and arranged along its length. The structural beam 30 located at the middle of the length of the housing 10 is the intermediate beam 30a. The three structural beams 30, in conjunction with the housing 10, define two arrangement cavities and one electrical cavity. There are eight battery cell assemblies 20, symmetrically arranged in the two arrangement cavities. Four battery cell assemblies 20 are arranged sequentially along the width of the housing 10 in each arrangement cavity. The battery cells 21 are square, with dimensions of 303mm × 100mm × 43mm. The length of the battery cell assembly 20 along the first direction is 600mm, and the height along the third direction is 110mm.

[0175] The fixing plate 40 is made of high-strength aluminum alloy (6061-T6). The fixing plate 40 is a one-piece molded plate with a thickness of not less than 1mm in the third direction. The multiple fixing plates 40 include a first fixing plate 40a, a second fixing plate 40b, a third fixing plate 40c, a fourth fixing plate 40d, a fifth fixing plate 40e, a sixth fixing plate 40f, and a seventh fixing plate 40g. Each fixing plate 40 includes a first plate portion 41 and at least one second plate portion 42. The first plate portion 41 extends along a second direction as an elongated plate body, and the second plate portion 42 is a rectangular flat plate shape and is connected to the first plate portion 41.

[0176] The first plate portion 41 of the fixing plate 40 is provided with one or more first connecting holes 412, which are arranged at intervals along the second direction. The structural beam 30 is provided with second connecting holes 31 corresponding to the first connecting holes 412. The connector 60 (bolt) passes through the first connecting holes 412 and the second connecting holes to fix the first plate portion 41 to the structural beam 30. When tightening the connector 60, the bolt preload can be set to 15 N·m. Each second plate portion 42 is bonded to at least two battery cells 21 in the connected battery cell assembly 20 by structural adhesive. The length of each second plate portion 42 in the first direction is not greater than half of the total length of the battery cell assembly 20. The structural adhesive can be a two-component polyurethane structural adhesive with a thickness of 1 mm to 3 mm and a shear strength greater than or equal to 9 MPa.

[0177] The first fixing plate 40a, the second fixing plate 40b and the third fixing plate 40c each include only one second plate part 42. The first plate part 41 and the second plate part 42 of the first fixing plate 40a are connected in an L-shape. The first fixing plate 40a is arranged at the end of the structural beam 30 (non-intermediate beam 30a) and the box body 10.

[0178] The first plate portion 41 and the second plate portion 42 of the second fixing plate 40b are flush at both ends in the second direction. The second fixing plate 40b is a rectangular plate in general. The second fixing plate 40b is arranged between the two ends of the structural beam 30 (non-intermediate beam 30a), between two adjacent battery cell assemblies 20 in the second direction, and connects the two battery cell assemblies 20 arranged side by side in the second direction.

[0179] The first plate portion 41 and the second plate portion 42 of the third fixing plate 40c are connected in a T-shape. The length of the first plate portion 41 of the third fixing plate 40c in the second direction is greater than the width of the second plate portion 42 in the second direction. The third fixing plate 40c is located between two adjacent battery cell assemblies 20 in the second direction and connects the two battery cell assemblies 20 arranged side by side in the second direction.

[0180] The fourth fixing plate 40d, the fifth fixing plate 40e, and the sixth fixing plate 40f each include two second plate portions 42, which are symmetrically arranged on both sides of the first plate portion 41 in the first direction. Specifically, the first plate portion 41 of the fourth fixing plate 40d is connected to the two second plate portions 42 in a T-shape. The fourth fixing plate 40d is located at the connection point between the end of the intermediate beam 30a and the housing 10. Each of the two second plate portions 42 is connected to a battery cell assembly 20.

[0181] The first plate portion 41 and the two second plate portions 42 of the fifth fixing plate 40e are flush at both ends in the second direction. The fifth fixing plate 40e is a rectangular plate (in a straight line). The fifth fixing plate 40e is arranged between the two ends of the structural beam 30 (non-intermediate beam 30a). The two second plate portions 42 are located between two adjacent battery cell assemblies 20 in the second direction and are connected to the two battery cell assemblies 20 arranged side by side in the second direction.

[0182] The first plate portion 41 of the sixth fixing plate 40f and the two second plate portions 42 are connected in a cross shape. The length of the first plate portion 41 of the sixth fixing plate 40f in the second direction is greater than the width of the second plate portion 42 in the second direction. The sixth fixing plate 40f is arranged between the two ends of the intermediate beam 30a. The two second plate portions 42 are located between two adjacent battery cell assemblies 20 in the second direction and are connected to the two battery cell assemblies 20 arranged side by side in the second direction.

[0183] The seventh fixing plate 40g includes three second plate portions 42, all of which are arranged on the same side of the first plate portion 41 in a first direction and spaced apart in a second direction. Two of the second plate portions 42 located at both ends of the first plate portion 41 are flush with the end edges of both ends of the first plate portion 41, and the third second plate portion 42 is located at the middle of the first plate portion 41 along the second direction. The seventh fixing plate 40g is arranged between the two ends of the structural beam 30 (not the intermediate beam 30a). Each of the three second plate portions 42 is located between two adjacent battery cell assemblies 20 in the second direction and is connected to two battery cell assemblies 20 arranged side-by-side in the second direction.

[0184] It should be noted that the position of the fixing plate 40 can be flexibly arranged according to the size, position and stress analysis of the battery cell assembly 20.

[0185] In the battery device 100 of the above embodiment, the length of the fixing plate 40 along the first direction is shorter than the length of the battery cell assembly 20. This reduces the probability that the fixing plate 40 penetrates the insulating film layer of the battery cell 21, thereby reducing insulation risk and short-circuit hazards. Compared with a long strip of pressure strip, the fixing plate 40 is shorter, requires less material, and can save more than 30% of material costs. The assembly process is simplified, and the overall cost is reduced by 25%-40%. The fixing plate 40 is only glued to the battery cell 21 by the adhesive component 50. The adhesive component 50 has a buffering and energy-absorbing function, which can absorb the stress generated by the expansion of the battery cell 21. The structure is designed to reduce rigid impact and improve structural reliability. Multiple fixing plates 40 can be arranged according to the layout requirements of the battery cell module 20 (such as symmetrical, staggered, or zoned arrangement). The shape of the fixing plates 40 can be customized without affecting the arrangement of the battery cells 21 and the design of the thermal management channels, thus improving design flexibility. Each fixing plate 40 can be disassembled and installed independently, which facilitates fault diagnosis and replacement and makes maintenance more convenient. In addition, the shear strength of the structural adhesive is designed to be higher than the allowable tensile strength of the fixing plates 40, which can ensure that the adhesive connection is a "safety redundancy" design under normal working conditions, preventing structural collapse caused by adhesive failure.

[0186] Example 2, as Figure 13 and Figure 14 As shown, the structure of this embodiment is largely the same as that of Embodiment 1, with identical components using the same reference numerals. The only difference is that in Embodiment 1, the fixing plate 40 only includes a first plate portion 41 and a second plate portion 42, which are integrally formed, while in this Embodiment 2, the fixing plate 40 also includes a connecting portion 43. The first plate portion 41 and the second plate portion 42 are spaced apart along a first direction and connected by the connecting portion 43. The connecting portion 43 is a hinge or a spring.

[0187] Furthermore, the second plate portion 42 is provided with a first positioning portion 421 extending toward the battery cell 21 in a third direction at one end away from the first plate portion 41 in a first direction. The first positioning portion 421 is used to position and cooperate with the assembly gap (second positioning portion 22) between two adjacent battery cells 21.

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: The housing has a receiving cavity; A battery cell assembly, wherein the battery cell assembly is disposed within the receiving cavity and includes a plurality of battery cells stacked along a first direction; A structural beam, which extends along a second direction and is fixed to the housing, and is arranged on at least one side of the battery cell assembly in the first direction; A fixing plate is arranged on one side of the battery cell assembly in the third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. Along the first direction, the length of the fixing plate is smaller than the length of the battery cell assembly. The two ends of the fixing plate in the first direction are fixed to the structural beam and the battery cell, respectively.

2. The battery device according to claim 1, characterized by Along the first direction, the overlap length between the fixing plate and the battery cell assembly is less than half the length of the battery cell assembly; and / or, Along the first direction, the fixing plate is fixedly connected to at least two of the battery cells in the battery cell assembly.

3. The battery device of claim 1, wherein The fixing plate is bonded to the housing of the battery cell using adhesive.

4. The battery device of claim 3, wherein The shear strength of the adhesive component is greater than the allowable tensile stress of the fixing plate.

5. The battery device of claim 3, wherein The adhesive is a structural adhesive or a foam adhesive.

6. The battery device of claim 3, wherein The battery device further includes a buffer element disposed between the fixing plate and the battery cell.

7. The battery device of claim 6, wherein The buffer and the adhesive are stacked on the third side, or the buffer and the battery cell cooperate to form a glue-filled groove, and the adhesive is filled in the glue-filled groove.

8. The battery device of claim 1, wherein The fixing plate is provided with a first positioning part, and the battery cell assembly is provided with a second positioning part. The first positioning part and the second positioning part are positioned and cooperated to position the relative position of the fixing plate and the battery cell assembly.

9. The battery device of claim 8, wherein, The second positioning part is formed as a positioning hole or a positioning groove; and / or, The second positioning part is formed on the housing of the battery cell, or two adjacent battery cells cooperate to define the second positioning part.

10. The battery device of claim 1, wherein, The fixing plate is connected to the structural beam by bolts, riveting, welding, or snap-fit.

11. The battery device of claim 1, wherein A portion of the fixing plate is formed as a connecting area, the connecting area having a first connecting hole, and the structural beam having a second connecting hole. The connecting area is fixedly connected to the structural beam by a connector passing through the first connecting hole and the second connecting hole, wherein the structural strength of the connecting area is greater than the structural strength of the rest of the fixing plate.

12. The battery device of claim 11, wherein, The connection area is equipped with a reinforcing structure.

13. The battery device of any one of claims 1-12, wherein, The fixing plate includes a first plate portion and a second plate portion. The first plate portion extends along the second direction into an elongated plate body and is fixed to the structural beam. The second plate portion is connected to at least one side of the first plate portion in the first direction and extends along the first direction. The second plate portion is fixed to the battery cell.

14. The battery device of claim 13, wherein, Along the second direction, the end edges of both ends of the first plate portion are flush with the end edges of both ends of the second plate portion; or, The length dimension of the first plate portion along the second direction is greater than the width dimension of the second plate portion along the second direction.

15. The battery device of claim 13, wherein, The first plate portion is connected to a second plate portion on one side in the first direction, the second plate portion is connected at the middle position of the first plate portion in the second direction, or the second plate portion is connected to the end of one end of the first plate portion in the second direction; or, The first plate portion is connected to a plurality of second plate portions on one side of the first direction, and the plurality of second plate portions are arranged at intervals along the second direction.

16. The battery device of claim 13, wherein, The fixing plate further includes a connecting portion, wherein the first plate portion and the second plate portion are connected by the connecting portion, and the connecting portion is configured to allow relative displacement between the first plate portion and the second plate portion.

17. The battery device of claim 16, wherein, The connecting part is a spring or a hinge.

18. The battery device of claim 1, wherein, The fixing plate is an integrally molded part, and / or the fixing plate is a metal part or a composite fiber material part.

19. The battery device of claim 1, wherein, The surface of the fixing plate is provided with an insulating layer.

20. The battery device of claim 1, wherein, The number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged sequentially along the second direction. The number of fixing plates is multiple, and at least one fixing plate is connected to at least two battery cell assemblies adjacent to each other in the second direction.

21. The battery device of claim 1, wherein, At least one of the structural beams is formed as an intermediate beam, and there are multiple battery cell assemblies arranged on both sides of the intermediate beam in the first direction. The fixing plate connected to the intermediate beam is an intermediate fixing plate, and the two ends of the intermediate fixing plate in the first direction are respectively connected to the battery cell assemblies located on both sides of the intermediate beam.

22. An electrical device, comprising: The battery device includes any one of claims 1-21.

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