Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a battery monomer assembly, a limiting assembly and at least two beam structures, the two beam structures are spaced in the first direction to form an installation space, each beam structure comprises a fixing hole and a cavity, and the fixing holes and the cavities are isolated from each other. The battery cell assembly includes a battery cell, at least a portion of the battery cell is located within the mounting space, and the beam structure is in contact with the battery cell assembly in a first direction. One end of the limiting assembly in the first direction is fixed in the fixing hole of one beam structure, and the other end of the limiting assembly is fixed in the fixing hole of the other beam structure on the other side in the first direction. According to the battery device in the embodiment of the invention, the structural strength of the area, used for being fixed with the limiting assembly, of the beam structure is higher than that of the area, provided with the cavity, of the beam structure, so that the probability that the connecting position of the beam structure and the limiting assembly is damaged and the beam structure is separated from the limiting assembly under the influence of the expansion acting force of the single battery is reduced.

Description

A battery device and an electrical device Technical Field

[0001] This application relates to battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0002] A battery device includes individual battery cells. During the charging and discharging process of a battery cell, the outer contour of the battery cell will expand and deform, which will have an adverse effect on other components around the battery cell.

[0003] In related technologies, the battery device includes a limiting component and at least two beam structures. The limiting component connects the two beam structures, and the battery cell is located between the two beam structures and can constrain the expansion of the battery cell. The limiting component further constrains the position of the battery cell.

[0004] However, the force generated by the expansion of the battery cells causes deformation at the connection between the limiting component and the beam structure, and may even cause them to separate, thus making it impossible for the beam structure and the limiting component to meet the requirements for the constraint of the battery cells. Summary of the Invention

[0005] This application provides a battery device and an electrical device that can reduce the probability of the beam structure and limiting components in the battery device separating or being damaged under the expansion force of the battery cells.

[0006] The technical solution of this application embodiment is implemented as follows:

[0007] This application provides a battery device, including:

[0008] At least two beam structures are provided, the two beam structures are spaced apart from each other along a first direction to form an installation space, the beam structures include fixing holes and cavities, the fixing holes and the cavities are isolated from each other;

[0009] A battery cell assembly includes battery cells, at least a portion of which is located within the mounting space, and the beam structure contacts the battery cell assembly along the first direction;

[0010] The limiting component has one end fixed in the fixing hole of one beam structure along the first direction and the other end fixed in the fixing hole of another beam structure along the other side of the first direction.

[0011] In the battery device of this application embodiment, the fixing holes of the beam structure used to fix the limiting component are isolated from the cavity, so that the structural strength of the area of ​​the beam structure used to fix the limiting component is higher than that of the area of ​​the beam structure with the cavity. This reduces the probability of damage to the connection position between the beam structure and the limiting component and the probability of the beam structure separating from the limiting component under the influence of the expansion force of the battery cell. This helps to keep the position of the battery cell stable and helps to extend the service life of the battery device.

[0012] In some embodiments, the extending direction of the fixing hole intersects with the first direction. Thus, the inner wall of the fixing hole can act as a stop along the first direction for the portion of the limiting component inserted into the fixing hole, reducing the probability that the limiting component will dislodge from the fixing hole due to the force generated by the expansion of the battery cell.

[0013] In some embodiments, in a projection plane perpendicular to the first direction, the projection of the fixing hole along the first direction is located outside the projection range of the cavity along the first direction. This further improves the structural strength of the structure surrounding the fixing hole, reduces the risk of deformation or damage to the fixing hole, and enhances the connection stability of the limiting component and the beam structure.

[0014] In some embodiments, the battery device includes a housing assembly with a receiving cavity within it. The beam structure, the battery cell assembly, and the limiting assembly are all located within the receiving cavity. At least one inner wall of the receiving cavity along a second direction is fixed to the beam structure, where the first direction intersects the second direction. Thus, the beam structure can suppress deformation of the housing assembly, improving the overall structural strength of the battery device; and the inner wall of the receiving cavity can constrain the position of the battery cells in the second direction.

[0015] In some embodiments, the inner wall of the receiving cavity includes a first wall and a second wall, the first wall and the second wall being spaced apart from each other along the second direction, the beam structure being fixed to the first wall and spaced apart from the second wall along the second direction, and at least a portion of the fixing holes being located on the side of the cavity closer to the second wall. Thus, the limiting component can suppress deformation of the beam structure on the side of the cavity closer to the second wall along the second direction in the first direction.

[0016] In some embodiments, the plurality of fixing holes includes a first hole, and the end face of the beam structure away from the first wall along the second direction is a first face, with the first hole located on the first face. Thus, the first hole is located at the position of the beam structure furthest from the first wall along the second direction, thereby enabling the limiting component to better constrain the deformation of the portion of the beam structure away from the first wall along the first direction; simultaneously, the limiting component and the first wall together constrain the position of the battery cell assembly along the second direction.

[0017] In some embodiments, there are multiple cavities, each located between the fixing hole and the first wall. This has two advantages: firstly, it helps to better suppress deformation of the beam structure along the second direction on the side of the cavity away from the first wall along the first direction; secondly, it allows for a more compact arrangement of the fixing hole and cavities on the beam structure, resulting in a more compact beam structure.

[0018] In some embodiments, the end face of the beam structure along a third direction is a second face, the first direction, the second direction, and the third direction intersect each other, the second face is spaced apart from the inner wall of the receiving cavity, and the plurality of fixing holes include a second hole, which is located on the second face. Thus, by providing the second hole, the limiting component fixed to the second hole can constrain the battery cell assembly along a third direction.

[0019] In some embodiments, the multiple beam structures include a first beam, which is a one-piece molded structure. This helps reduce the number of components in the battery device, simplifies the assembly steps of the beam structures during battery device assembly, and improves manufacturing efficiency.

[0020] In some embodiments, multiple beam structures include a second beam, which comprises a beam body and a mounting base. The cavity is located within the beam body, and the beam body has a mounting groove. The mounting base is embedded in the mounting groove and fixed to the beam body, and a fixing hole is provided in the mounting base. This allows for a wider variety of arrangements of the cavity and fixing hole, and also facilitates adjusting the relative position of the mounting base and the beam body during installation to achieve the purpose of the tensioning and limiting assembly.

[0021] In some embodiments, a limiting wall is provided on one side of the mounting groove along the first direction, and the limiting wall is located between the battery cell assembly and the mounting base along the first direction. Thus, the limiting wall inhibits movement of the mounting base along the first direction toward the battery cell assembly, which helps to keep the position of the fixing hole stable.

[0022] In some embodiments, at least a portion of the beam structure is a foamed structure, which helps to reduce the weight of the beam structure and facilitates the lightweighting of the battery device.

[0023] And / or, the battery device further includes a filler located within the cavity. The filler is a foamed structure, which supports the inner wall of the cavity, thus reducing the probability of deformation of the beam structure under the expansion force of the battery cells. The foamed structure of the filler also helps to reduce its weight, contributing to the lightweight design of the battery device.

[0024] This application also provides an electrical device, which includes a battery device as described in any of the foregoing embodiments, the battery device being used as a power source for the electrical device.

[0025] Thus, by employing the battery device in the aforementioned embodiments, the lifespan of the battery device is extended by stably constraining the position of the individual battery cells in the battery device, thereby extending the lifespan of the electrical device. Attached Figure Description

[0026] Figure 1 is a schematic diagram of the electrical device provided in an embodiment of this application;

[0027] Figure 2 is an exploded schematic diagram of the battery device provided in an embodiment of this application;

[0028] Figure 3 is a schematic diagram of the battery device provided in the embodiment of this application without the second housing;

[0029] Figure 4 is a magnified view of a portion of position A in Figure 3;

[0030] Figure 5 is a schematic diagram of the embodiment in Figure 3 without the limiting component and the battery cell assembly;

[0031] Figure 6 is a magnified view of a portion of position C in Figure 5;

[0032] Figure 7 is a partial cross-sectional view of the battery cell assembly at the BB position in the embodiment of Figure 3 with the individual battery cells removed;

[0033] Figure 8 is a magnified view of a portion of position D in Figure 7;

[0034] Figure 9 is a magnified view of a portion of position E in Figure 7;

[0035] Figure 10 is a schematic diagram of a beam structure in one embodiment of this application;

[0036] Figure 11 is a schematic diagram of the beam structure in another embodiment of this application.

[0037] Explanation of reference numerals in the attached figures

[0038] 1000, Vehicle; 100, Battery Unit; 100a, Installation Space; 200, Controller; 300, Motor; 10, Battery Cell Assembly; 11, Battery Cell; 20, Limiting Assembly; 21, Connecting Belt; 22, Connector; 30, Beam Structure; 30a, Cavity; 30b, Fixing Hole; 30ba, First Hole; 30bb, Second Hole; 30c, First Surface; 30d, Second Surface; 31, First Beam; 32, Second Beam; 321, Beam Body; 321a, Mounting Groove; 3211, Limiting Wall; 322, Mounting Seat; 40, Housing Assembly; 40a, Receiving Cavity; 41, First Housing; 411, First Wall; 42, Second Housing; 421, Second Wall; 50, Filler. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., 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.

[0042] 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.

[0043] 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 are in an "or" relationship.

[0044] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "top", "bottom", "inner", "outer", "circumferential", etc., 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0047] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. Specifically, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0048] In the description of the embodiments of this application, for ease of explanation, as shown in the accompanying drawings, the direction of arrow X is referred to as the "first direction", the direction of arrow Y as the "second direction", and the direction of arrow Z as the "third direction".

[0049] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0050] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0051] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0052] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0053] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0054] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0055] In some implementations, the electrode assembly is a stacked structure.

[0056] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0057] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0058] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0059] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0060] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0061] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0062] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0063] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0064] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0065] In some embodiments, a pressure relief mechanism is provided on the casing of the battery cell. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0066] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of a battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0067] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0068] As an example, the pressure relief mechanism can also be separately installed and connected to the outer casing.

[0069] 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 multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] As an example, the battery cell assembly can be part of a battery module, which is formed by arranging and fixing multiple battery cells together to create an independent module. As another example, the battery module can be formed by bundling multiple battery cells together with cable ties.

[0072] In some embodiments, the battery device may be a battery pack, which includes a housing assembly and one or more individual battery cells housed within the housing assembly.

[0073] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing assembly by fixing the battery module in the housing assembly.

[0074] As an example, the battery cell assembly can also be housed in the housing assembly by directly fixing multiple battery cells to the housing assembly.

[0075] As an example, the housing assembly may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing assembly to house the individual battery cells. Here, "closed" refers to covering or shutting down, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0076] As an example, the housing assembly may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing assembly forms a closed space to accommodate individual battery cells.

[0077] In some embodiments, the housing assembly may be part of the vehicle's chassis structure. For example, a portion of the housing assembly may be at least a portion of the vehicle's floor, or a portion of the housing assembly may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0078] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0079] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0080] Vehicle 1000 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. As shown in Figure 1, a battery device 100 is installed inside vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0081] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] The embodiments of this application will now be described in detail.

[0083] In related technologies, battery devices include individual battery cells. During charging and discharging, the material changes caused by electrochemical reactions result in the expansion of the overall outer contour of the battery cell. This change in the outer contour dimensions of the battery cell affects other components around it, impacting the normal operation of the battery device. Therefore, battery devices also include beam structures and limiting components. The beam structure enhances the overall structural strength of the battery device and can directly or indirectly contact the battery cells to suppress their expansion and deformation. Simultaneously, the limiting components connect the beam structure to other beam structures or other structural components within the battery device along the expansion direction of the battery cells, further constraining the position of the battery cells.

[0084] During the expansion of a single battery cell, it exerts a force on the beam structure, which in turn exerts a tensile force on the restraining components connected to the beam structure. The load is mainly concentrated at the connection point between the restraining components and the beam structure. Therefore, the connection point between the restraining components and the beam structure is prone to deformation or damage, potentially causing the restraining components and the beam structure to separate from each other. Consequently, the restraining effect of the restraining components and the beam structure on the battery cell may not meet the requirements.

[0085] Based on the above-mentioned technical problems, this application provides a battery device in which a portion of the limiting component is fixed in a fixing hole in a beam structure, and the fixing hole is isolated from the cavity of the beam structure. This makes the fixing position of the limiting component and the beam structure located in a region with high structural strength of the beam structure, reducing the probability of damage to the fixing position between the limiting component and the beam structure and separation of the two under the influence of the expansion force of the battery cell.

[0086] Specifically, referring to Figures 2 to 4 and Figures 8 to 10, the battery device 100 includes a battery cell assembly 10, a limiting assembly 20, and at least two beam structures 30.

[0087] Two beam structures 30 are spaced apart from each other along a first direction to form an installation space 100a. Each beam structure 30 includes a fixing hole 30b and a cavity 30a, with the fixing hole 30b and the cavity 30a being isolated from each other.

[0088] The battery cell assembly 10 includes a battery cell 11, at least a portion of which is located within the installation space 100a, and the beam structure 30 contacts the battery cell assembly 10 along a first direction.

[0089] One end of the limiting component 20 along the first direction is fixed in a fixing hole 30b of a beam structure 30, and the other end is fixed in a fixing hole 30b of another beam structure 30 along the other side of the first direction.

[0090] The beam structure 30 can form a force transmission path with the battery cell 11 along the first direction, and the two beam structures 30 spaced apart along the first direction together suppress the expansion of the battery cell 11 in the battery cell assembly 10 along the first direction.

[0091] The battery cell 11 in the battery cell assembly 10 may be in direct contact with the beam structure 30, or other components in the battery cell assembly 10 may be sandwiched between the battery cell 11 and the beam structure 30. For example, the battery cell assembly 10 may also include an insulating pad sandwiched between the battery cell 11 and the beam structure 30 along a first direction.

[0092] The beam structure 30 has a cavity 30a, which helps to reduce the weight of the beam structure 30 and the battery device 100.

[0093] A portion of the limiting component 20 is located on the side of the battery cell assembly 10 perpendicular to the first direction, thereby constraining the position of the battery cell 11 in the perpendicular direction by means of the limiting component 20.

[0094] It is understandable that a portion of the limiting component 20 is located within the fixing hole 30b and is fixedly engaged with the inner wall of the fixing hole 30b.

[0095] The fixing hole 30b and the cavity 30a are isolated from each other, meaning that the fixing hole 30b and the cavity 30a are not connected to each other. Therefore, a part of the limiting component 20 will not enter the cavity 30a through the fixing hole 30b.

[0096] Understandably, due to the presence of cavity 30a, the structural strength of the area of ​​beam structure 30 forming cavity 30a is lower than that of other parts of beam structure 30. Furthermore, the fact that fixing hole 30b is not connected to cavity 30a helps to keep the connection point between limiting component 20 and beam structure 30 away from the area of ​​beam structure 30 forming cavity 30a. In other words, the structural strength of the portion of beam structure 30 that is fixed to limiting component 20 is higher.

[0097] In the battery device 100 of this application embodiment, the fixing hole 30b of the beam structure 30 used for fixing with the limiting component 20 is isolated from the cavity 30a, so that the structural strength of the area of ​​the beam structure 30 used for fixing with the limiting component 20 is higher than that of the area of ​​the beam structure 30 with the cavity 30a. This reduces the probability of damage to the connection position between the beam structure 30 and the limiting component 20 and the probability of the beam structure 30 and the limiting component 20 separating under the influence of the expansion force of the battery cell 11. This is beneficial to keeping the position of the battery cell 11 stable and to extending the service life of the battery device 100.

[0098] It is understandable that the limiting component 20, by connecting the two beam structures 30 spaced apart along the first direction, can suppress the deformation of the beam structure 30 in the first direction.

[0099] The number of battery cells 11 in the battery cell assembly 10 is unlimited; it can be one or more, such as two, three, four, five, six, seven, eight, etc.

[0100] In some embodiments where the number of battery cells 11 in the battery cell assembly 10 is multiple, the multiple battery cells 11 are arranged along a first direction. That is, during the charging and discharging process of the battery cells 11, the expansion size change of the battery cell assembly 10 along the first direction is the largest. By setting the beam structure 30 along the first direction, the deformation of the battery cell assembly 10 along the first direction can be better suppressed.

[0101] In some embodiments, the volume of the fixing hole 30b is smaller than the volume of the cavity 30a, which helps to reduce the adverse effects of the fixing hole 30b itself on the structural strength of the beam structure 30.

[0102] The number of cavities 30a set in a single beam structure 30 is unlimited; it can be one or more, such as two, three, four, five, six, etc.

[0103] The number of fixing holes 30b set in a single beam structure 30 is unlimited; it can be one or more, such as two, three, four, five, six, etc.

[0104] In some embodiments, the limiting component 20 extends along a first direction, which helps to reduce the shear force perpendicular to the first direction exerted on the limiting component 20 by the expansion of the battery cell 11, thereby improving the service life of the limiting component 20.

[0105] The specific number of limit components 20 is not limited; it can be one or more, such as two, three, four, five, six, seven, eight, etc.

[0106] It is understandable that the limiting component 20 can be fixed with only one fixing hole 30b on a beam structure 30, or it can be fixed with multiple fixing holes 30b on a beam structure 30.

[0107] In some embodiments, referring to Figures 3 and 4, the extending direction of the fixing hole 30b intersects with the first direction.

[0108] Thus, the inner wall of the fixing hole 30b can stop the portion of the limiting component 20 inserted into the fixing hole 30b along the first direction, reducing the probability that the limiting component 20 will be dislodged from the fixing hole 30b due to the force generated by the expansion of the battery cell 11.

[0109] In some embodiments, the extension direction of the fixing hole 30b is perpendicular to the first direction.

[0110] This further reduces the probability that the limiting component 20 will detach from the fixing hole 30b due to the force generated by the expansion of the battery cell 11.

[0111] In some embodiments, referring to Figures 8 to 11, in a projection plane perpendicular to the first direction, the projection of the fixing hole 30b along the first direction is located outside the projection range of the cavity 30a along the first direction.

[0112] In other words, the cavity 30a will not be located on both sides of the fixing hole 30b along the first direction, and both sides of the fixing hole 30b along the first direction are solid structures of the beam structure 30.

[0113] This further improves the structural strength of the structure surrounding the fixing hole 30b, reduces the risk of deformation or damage to the fixing hole 30b, and improves the connection stability between the limiting component 20 and the beam structure 30.

[0114] In some embodiments, referring to FIG2, the battery device 100 includes a housing assembly 40, which has a receiving cavity 40a. The beam structure 30, the battery cell assembly 10 and the limiting assembly 20 are all located in the receiving cavity 40a.

[0115] In this way, the housing assembly 40 protects the beam structure 30, the battery cell assembly 10, and the limiting assembly 20.

[0116] In some embodiments, referring to FIG7, the inner wall of at least one side of the receiving cavity 40a along the second direction is fixed to the beam structure 30, and the first direction intersects the second direction.

[0117] Thus, the beam structure 30 can suppress the deformation of the box assembly 40 and improve the overall structural strength of the battery device 100; the inner wall of the receiving cavity 40a can constrain the position of the battery cell 11 in the second direction.

[0118] The inner walls of the cavity 40a along the second direction can be fixed to the beam structure 30 on only one side, or both inner walls can be fixed to at least one beam structure 30.

[0119] In some embodiments, the housing assembly 40 includes a first housing 41 and a second housing 42, which are closed along a second direction to jointly enclose a receiving cavity 40a, and at least one of the first housing 41 and the second housing 42 is fixed to the beam structure 30.

[0120] The first housing 41 and the second housing 42 are detachably connected.

[0121] In some embodiments, the first direction is perpendicular to the second direction.

[0122] In some embodiments, referring to Figures 2 and 7, the inner wall of the receiving cavity 40a includes a first wall 411 and a second wall 421, the first wall 411 and the second wall 421 being spaced apart from each other along a second direction, and the beam structure 30 being fixed to the first wall 411 and spaced apart from the second wall 421 along the second direction.

[0123] Thus, during the assembly of the battery device 100, the first wall 411 can be fixedly connected to the beam structure 30 before the battery cell assembly 10 and the limiting assembly 20 are installed, and finally the second wall 421 is installed.

[0124] It is understandable that the beam structure 30 is fixed to the first wall 411 on one side along the second direction, so that the first wall 411 can constrain the deformation of the part of the beam structure 30 near the first wall 411 along the first direction. However, the part of the beam structure 30 near the second wall 421 along the second direction is not constrained by the inner wall of the receiving cavity 40a, and is prone to deformation along the first direction.

[0125] In some embodiments, at least a portion of the fixing hole 30b is located on the side of the beam structure 30 near the second wall 421.

[0126] That is, the beam structure 30 is divided into two parts arranged along the second direction and having the same size along the second direction, one part being located between the other part and the first wall 411, and at least part of the fixing hole 30b being located on a part of the beam structure 30 along the second direction near the second wall 421.

[0127] In this way, the limiting component 20 can be fixed to the side of the beam structure 30 near the second wall 421, thereby using the limiting component 20 to constrain the deformation of the side of the beam structure 30 near the second wall 421 along the first direction.

[0128] In some embodiments, referring to Figures 8 and 9, at least a portion of the fixing hole 30b is located on the side of the cavity 30a near the second wall 421.

[0129] Under the expansion force of the battery cell 11, the structure of the beam structure 30 located on the side of the cavity 30a closer to the second wall 421 along the second direction is more likely to deform along the first direction than the structure of the cavity 30a closer to the first wall 411.

[0130] Thus, the limiting component 20 can suppress the deformation of the beam structure 30 on the side of the cavity 30a near the second wall 421 in the first direction.

[0131] In some embodiments where there are multiple cavities 30a, a portion of the cavities 30a may have a fixing hole 30b on the side near the second wall 421, or each cavity 30a may have a fixing hole 30b on the side near the second wall 421.

[0132] In some embodiments, a portion of the first housing 41 forms a first wall 411, and a portion of the second housing 42 forms a second wall 421.

[0133] In some embodiments, referring to Figures 5, 6, 8 and 9, the plurality of fixing holes 30b include a first hole 30ba, and the end face of the beam structure 30 away from the first wall 411 along the second direction is a first surface 30c, and the first hole 30ba is provided on the first surface 30c.

[0134] The end face of the beam structure 30 away from the first wall 411 along the second direction, that is, the surface of the outer surface of the beam structure 30 that is opposite to the second wall 421 along the second direction.

[0135] Thus, the first hole 30ba is located at the position of the beam structure 30 furthest from the first wall 411 along the second direction, thereby enabling the limiting component 20 to better constrain the deformation of the portion of the beam structure 30 furthest from the first wall 411 along the first direction; at the same time, the limiting component 20 and the first wall 411 together constrain the position of the battery cell assembly 10 along the second direction.

[0136] In some embodiments, in the projection plane perpendicular to the second direction, at least a portion of the projection of the limiting component 20 fixed to the first hole 30ba along the second direction is located within the projection range of the battery cell 11 along the second direction, so that the limiting component 20 fixed to the first hole 30ba can limit the battery cell 11 along the second direction.

[0137] The number of first holes 30ba set in a single beam structure 30 is unlimited; it can be one or more, such as two, three, four, five, six, etc.

[0138] In some embodiments, referring to FIG6, there are multiple cavities 30a, each cavity 30a being located between the fixing hole 30b and the first wall 411.

[0139] In other words, the cavity 30a is not provided on the side of the fixing hole 30b that is away from the first wall 411 along the second direction.

[0140] In this way, on the one hand, it is beneficial to better suppress the deformation of the beam structure 30 along the second direction on the side of the cavity 30a away from the first wall 411 along the first direction; on the other hand, it is beneficial to make the setting of the fixing hole 30b and the cavity 30a on the beam structure 30 more compact, and to make the size of the beam structure 30 more compact.

[0141] In some embodiments, referring to Figures 6 and 11, the end face of the beam structure 30 along the third direction is the second face 30d. The first direction, the second direction and the third direction intersect each other. The second face 30d is spaced apart from the inner wall of the receiving cavity 40a. The plurality of fixing holes 30b include the second hole 30bb, which is located on the second face 30d.

[0142] Thus, by setting the second hole 30bb, the limiting component 20 fixed to the second hole 30bb can constrain the battery cell assembly 10 in a third direction.

[0143] In some embodiments, in a projection plane perpendicular to a third direction, at least a portion of the projection of the limiting component 20 fixed to the second hole 30bb along the third direction is located within the projection range of the battery cell 11 along the third direction, so that the limiting component 20 fixed to the second hole 30bb can limit the battery cell 11 along the third direction.

[0144] It is understandable that the beam structure 30 may have only one surface spaced from the inner wall of the receiving cavity 40a along the third direction, while the other surface is in contact with the inner wall of the receiving cavity 40a. In other words, the beam structure 30 has only one second surface 30d. Alternatively, the two surfaces of the beam structure 30 along the third direction may be spaced from the inner wall of the receiving cavity 40a. In other words, the beam structure 30 has two second surfaces 30d.

[0145] The number of second holes 30bb set in a single beam structure 30 is unlimited; it can be one or more, such as two, three, four, five, six, etc.

[0146] In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0147] In some embodiments, referring to FIG8, the plurality of beam structures 30 include a first beam 31, which is an integrally formed structure.

[0148] In other words, the first beam 31 is a single part, and the structure forming the fixing hole 30b and the structure forming the cavity 30a are different parts of the same part.

[0149] This helps reduce the number of parts in the battery device 100, simplifies the assembly steps of the beam structure 30 during the assembly of the battery device 100, and improves manufacturing efficiency.

[0150] The method of forming the fixing hole 30b and the cavity 30a in the first beam 31 is not limited. For example, the cavity 30a is formed by pultrusion molding, and the fixing hole 30b is formed by machining on the blank of the pultruded cavity 30a.

[0151] In some embodiments, referring to Figures 6 and 9, the multiple beam structures 30 include a second beam 32, the second beam 32 includes a beam body 321 and a mounting base 322, a cavity 30a is located in the beam body 321, the beam body 321 is provided with a mounting groove 321a, the mounting base 322 is embedded in the mounting groove 321a and fixed to the beam body 321, and a fixing hole 30b is provided in the mounting base 322.

[0152] In other words, the second beam 32 includes two different parts: the beam body 321 and the mounting base 322. After the beam body 321 and the mounting base 322 have their mounting cavities and fixing holes 30b manufactured respectively, they are assembled to form the second beam 32.

[0153] This facilitates the further enrichment of the arrangement of the cavity 30a and the fixing hole 30b, and also makes it easier to achieve the purpose of the tensioning and limiting component 20 by adjusting the relative position of the mounting base 322 and the beam body 321 during the installation of the beam body 321 and the mounting base 322.

[0154] The method of forming the fixing hole 30b and the cavity 30a in the second beam 32 is not limited. For example, the cavity 30a is formed by pultrusion molding of the beam body 321, the mounting groove 321a is formed by machining through holes in the beam body 321, the fixing hole 30b is formed by machining on the mounting seat 322, and then the mounting seat 322 is installed into the mounting groove 321a.

[0155] The specific method of fixing the beam body 321 to the mounting base 322 is not limited. For example, the beam body 321 and the mounting base 322 can be fixed by welding.

[0156] In some embodiments, referring to FIG9, a limiting wall 3211 is provided on one side of the mounting groove 321a along the first direction, and the limiting wall 3211 is located between the battery cell assembly 10 and the mounting base 322 along the first direction.

[0157] Thus, the limiting wall 3211 inhibits the movement of the mounting base 322 in the first direction toward the battery cell assembly 10, which helps to keep the position of the fixing hole 30b stable.

[0158] In some embodiments, as shown in FIG. 9, at least a portion of the beam structure 30 is a foamed structure. That is, the portion of the beam structure 30 outside the fixing hole 30b and the cavity 30a has multiple pores.

[0159] This helps reduce the weight of the beam structure 30 and makes the battery device 100 lighter.

[0160] It is understandable that the pore size in the foamed structure of beam structure 30 is smaller than that of fixed hole 30b and cavity 30a.

[0161] The type of foam structure of beam structure 30 is not limited; for example, the foam structure of beam structure 30 is foamed aluminum.

[0162] In some embodiments, referring to FIG11, the battery device 100 further includes a filler 50 located within the cavity 30a, and the filler 50 is a foamed structure.

[0163] Thus, the filler 50 supports the inner wall of the cavity 30a, which helps to suppress the probability of deformation of the beam structure 30 under the expansion force of the battery cell 11; the filler 50 is a foamed structure, which helps to reduce the weight of the filler 50 and contributes to the lightweighting of the battery device 100.

[0164] It is understandable that at least some of the pores in the foamed structure are closed structures and are not connected to the fixed hole 30b and the cavity 30a.

[0165] The specific structural form of the limit component 20 is not limited.

[0166] For example, referring to Figures 8 and 9, the limiting component 20 includes a connecting strip 21 and a connector 22. The connecting strip 21 extends along a first direction and has mounting through holes at both ends along the first direction. The mounting through holes penetrate the connecting strip 21. The connector 22 passes through the mounting through holes and is fixedly engaged with the connecting strip 21. A portion of the connector 22 is embedded in the fixing hole 30b to be fixedly connected with the beam structure 30.

[0167] The specific method of fixing the connector 22 to the beam structure 30 is not limited.

[0168] For example, the connector 22 is a screw, and the fixing hole 30b is a threaded hole. The connector 22 is threadedly connected to the beam structure 30 for disassembly; or the connector 22 is bonded to the beam structure 30 for fixation.

[0169] The battery device 100 in a specific embodiment of this application is as follows:

[0170] The battery assembly 100 includes at least two beam structures 30, a battery cell assembly 10, a limiting assembly 20, and a housing assembly 40. The two beam structures 30 are spaced apart from each other along a first direction to form an installation space 100a. Each beam structure 30 includes a fixing hole 30b and a cavity 30a, with the fixing hole 30b and the cavity 30a isolated from each other. The battery cell assembly 10 includes a battery cell 11, at least a portion of which is located within the installation space 100a. The beam structures 30 are in contact with the battery cell assembly 10 along the first direction. One end of the limiting assembly 20 along the first direction is fixed within the fixing hole 30b of one beam structure 30, and the other end is fixed within the fixing hole 30b of the other beam structure 30 along the opposite side of the first direction. The extending direction of the fixing hole 30b intersects the first direction. In a projection plane perpendicular to the first direction, the projection of the fixing hole 30b along the first direction is outside the projection range of the cavity 30a along the first direction. The housing assembly 40 has a receiving cavity 40a. The beam structure 30, the battery cell assembly 10, and the limiting assembly 20 are all located within the receiving cavity 40a. At least one inner wall of the receiving cavity 40a along a second direction is fixed to the beam structure 30. The first direction intersects the second direction. The inner wall of the receiving cavity 40a includes a first wall 411 and a second wall 421, which are spaced apart from each other along the second direction. The beam structure 30 is fixed to the first wall 411 and spaced apart from the second wall 421 along the second direction. At least some fixing holes 30b are located on the side of the cavity 30a closest to the second wall 421. Multiple fixing holes 30b include a first hole 30ba. The end face of the beam structure 30 away from the first wall 411 along the second direction is a first surface 30c, and the first hole 30ba is located on the first surface 30c. There are multiple cavities 30a, each located between the fixing holes 30b and the first wall 411. The beam structure 30 has a second face 30d along a third direction. The first, second, and third directions intersect each other. The second face 30d is spaced apart from the inner wall of the receiving cavity 40a. Multiple fixing holes 30b include a second hole 30bb, which is located on the second face 30d. The multiple beam structures 30 include a first beam 31, which is an integrally formed structure. The multiple beam structures 30 also include a second beam 32, which includes a beam body 321 and a mounting base 322. The cavity 30a is located within the beam body 321. The beam body 321 has a mounting groove 321a, and the mounting base 322 is embedded in the mounting groove 321a and fixed to the beam body 321. Fixing holes 30b are located on the mounting base 322. A limiting wall 3211 is provided on one side of the mounting groove 321a along the first direction, located between the battery cell assembly 10 and the mounting base 322 along the first direction. At least a portion of the beam structure 30 is a foamed structure; and / or, the battery device 100 also includes a filler 50 located within the cavity 30a, the filler 50 being a foamed structure.

[0171] This application embodiment also provides an electrical device, which includes any of the battery devices 100 in the foregoing embodiments, and the battery devices 100 are used as the power source for the electrical device.

[0172] Thus, by employing the battery device 100 in the aforementioned embodiments, and by stably constraining the position of the battery cells 11 in the battery device 100, the service life of the battery device 100 is extended, thereby extending the service life of the electrical device.

[0173] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, include: At least two beam structures, the two beam structures being spaced apart from each other along a first direction to form an installation space, each beam structure including a fixing hole and a cavity, the fixing hole and the cavity being isolated from each other; a battery cell assembly including a battery cell, at least a portion of the battery cell being located within the installation space, the beam structures contacting the battery cell assembly along the first direction; a limiting component, one end of which is fixed in the fixing hole of one of the beam structures along the first direction and the other end of which is fixed in the fixing hole of another beam structure on the other side of the first direction.

2. The battery device according to claim 1, characterized in that, The extension direction of the fixing hole intersects with the first direction.

3. The battery device according to claim 1, characterized in that, In a projection plane perpendicular to the first direction, the projection of the fixing hole along the first direction is outside the projection range of the cavity along the first direction.

4. The battery device according to claim 1, characterized in that, The battery device includes a housing assembly with a receiving cavity inside. The beam structure, the battery cell assembly, and the limiting assembly are all located within the receiving cavity. The inner wall of the receiving cavity along at least one side of a second direction is fixed to the beam structure. The first direction intersects the second direction.

5. The battery device according to claim 4, characterized in that, The inner wall of the cavity includes a first wall and a second wall, the first wall and the second wall being spaced apart from each other along the second direction, the beam structure being fixed to the first wall and spaced apart from the second wall along the second direction, and at least part of the fixing holes being located on the side of the cavity closer to the second wall.

6. The battery device according to claim 5, characterized in that, The plurality of fixing holes include a first hole, and the end face of the beam structure away from the first wall along the second direction is the first face, and the first hole is located on the first face.

7. The battery device according to claim 5, characterized in that, There are multiple cavities, and each cavity is located between the fixing hole and the first wall.

8. The battery device according to claim 4, characterized in that, The end face of the beam structure along the third direction is the second face. The first direction, the second direction and the third direction intersect each other. The second face is spaced apart from the inner wall of the receiving cavity. The plurality of fixing holes include the second hole, which is located on the second face.

9. The battery device according to claim 1, characterized in that, The plurality of beam structures include a first beam, which is a one-piece molded structure.

10. The battery device according to claim 1, characterized in that, The plurality of beam structures include a second beam, the second beam including a beam body and a mounting base, the cavity being located in the beam body, the beam body having a mounting groove, the mounting base being embedded in the mounting groove and fixed to the beam body, and the fixing hole being provided in the mounting base.

11. The battery device according to claim 10, characterized in that, The mounting groove is provided with a limiting wall on one side along the first direction, and the limiting wall is located between the battery cell assembly and the mounting base along the first direction.

12. The battery device according to any one of claims 1 to 11, characterized in that, At least a portion of the beam structure is a foamed structure; and / or, the battery device further includes a filler located within the cavity, the filler being a foamed structure.

13. An electrical appliance, characterized in that, The electrical device includes a battery device as described in any one of claims 1 to 12, the battery device being used as a power source for the electrical device.

Images