Battery device and electric appliance

Abstract

The application belongs to the technical field of batteries, and provides a battery device and an electric equipment. The battery device comprises a box body, a structural beam, a battery monomer assembly arranged in the box body, and a second limiting piece arranged on the structural beam and having a first surface. The battery device further comprises a first limiting piece having a second surface and a third surface arranged oppositely, the second surface is in abutment with a side surface of the battery monomer assembly, the first limiting piece is in abutment with the battery monomer assembly along a first direction, and the third surface cooperates with the first surface to absorb assembly tolerances of the box body and the battery monomer assembly. The first limiting piece has a limiting part, the limiting part is located on one side of the battery monomer assembly along a second direction, and is used for limiting the battery monomer assembly in the second direction. The first direction and the second direction are arranged intersectingly. The first limiting piece locks and fixes the battery monomer assembly in the first direction, the limiting part provides limiting in the second direction, the possibility of large displacement of the battery monomer in the box body is reduced, and the safety and reliability of the battery device are improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and more specifically, relates to a battery device and an electrical appliance. Background Technology

[0002] Battery devices are increasingly used in various fields such as energy storage power systems, electric vehicles, military equipment, and aerospace. The solution of directly integrating battery cells into the casing is widely used because it can effectively improve volume utilization.

[0003] During the operation of the battery device, external bumps and vibrations, as well as the charging and discharging of individual battery cells, can cause the individual battery cells to expand and contract, resulting in displacement of the individual battery cells within the casing. This can adversely affect the reliability and safety of the battery device. Utility Model Content

[0004] The purpose of this application is to provide a battery device and an electrical appliance to solve the technical problems of low reliability and safety of battery devices in the prior art.

[0005] In a first aspect, this application provides a battery device, including: a housing having structural beams; Battery cell assembly is disposed within the housing; A second limiting member is disposed on the structural beam, and the second limiting member has a first surface; The first limiting member has a second surface and a third surface disposed opposite to each other. The second surface abuts against the side of the battery cell assembly, so that the first limiting member presses against the battery cell assembly along a first direction. The third surface cooperates with the first surface to absorb the assembly tolerances of the housing and the battery cell assembly. The first limiting member has a limiting part located on one side of the battery cell assembly along a second direction, which is used to limit the battery cell assembly in the second direction. The first direction and the second direction are intersecting.

[0006] In the technical solution of this application embodiment, the first limiting member is located between the second limiting member and the battery cell assembly. The first surface abuts against the side of the battery cell assembly, causing the first limiting member to abut against the battery cell assembly along a first direction, thus locking and fixing the battery cell assembly in the first direction. The limiting part is located on one side of the battery cell assembly along a second direction. If the battery cell assembly moves along the second direction, the limiting part will constrain its movement. This locking, fixing, and limiting method does not rely on bottom adhesive, reducing the risk of reduced reliability and safety caused by expansion during battery device operation. Furthermore, the second and third surfaces cooperate to absorb assembly tolerances between the housing and the battery cell assembly, facilitating the assembly of the battery cell assembly and the housing, reducing interference, and lowering manufacturing costs.

[0007] In some embodiments, the battery cell assembly includes a plurality of battery cells arranged along a third direction, and the limiting portion extends along the third direction to limit the plurality of battery cells in a second direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar, thereby reducing the risk of the upper limit failure in the second direction due to loosening between some battery cells.

[0008] In some embodiments, the first surface and the third surface are parallel planes and are inclined relative to the second direction. The inclined planes of the first and third surfaces allow for relative sliding, thereby absorbing energy, reducing impact transmission, and enabling tolerance adaptation during assembly.

[0009] In some embodiments, with the direction pointing from the second direction to the limiting portion as the positive direction of the second direction, the first surface is inclined relative to the second direction towards the side away from the battery cell assembly along the positive direction of the second direction, and the thickness of the portion of the first limiting member between the second limiting member and the battery cell assembly gradually increases along the positive direction of the second direction. The inclined first surface creates a gradually changing space between the third surface and the battery cell assembly, which is larger at the top and smaller at the bottom, facilitating the installation of the first limiting member and the battery cell assembly into the housing.

[0010] In some embodiments, both the first surface and the third surface include alternating protrusions and recesses arranged in a horizontal direction. The protrusions and recesses extend along the second direction. The protrusions in the first surface are inserted into the recesses in the third surface, and the protrusions in the third surface are inserted into the recesses in the first surface. The protrusions and recesses can press against each other and generate elastic deformation to absorb assembly tolerances between the housing and the battery cell assembly.

[0011] In some embodiments, both the first surface and the third surface are wave-shaped surfaces. When subjected to impact or vibration, the wave-shaped surfaces can undergo elastic deformation, thereby absorbing energy, providing buffer protection, and reducing the impact load transmitted to the battery cell assembly.

[0012] In some embodiments, a sandwich layer is provided between the first limiting member and the side of the battery cell assembly and / or between the second limiting member and the structural beam. The sandwich layer includes at least one of a buffer layer, an insulating layer, a heat insulation layer, and a flame-retardant layer. By utilizing the existing fit gap, and without changing the main structure, one or more of the buffer layer, insulating layer, heat insulation layer, and flame-retardant layer can be selected to form the sandwich layer, flexibly expanding the functions and improving the safety protection function of the battery device.

[0013] In some embodiments, the second limiting member and the structural beam are an integral structure, which reduces the number of independent parts, simplifies the assembly process, reduces the risk of relative displacement or loosening at the connection between the second limiting member and the structural beam, and improves the reliability of the limiting member under long-term vibration conditions.

[0014] In some embodiments, the second limiting member is separately disposed from the structural beam, and the second limiting member is fixedly connected to the structural beam. The separate disposal of the second limiting member from the structural beam facilitates the processing and manufacturing of the structural beam, allows for flexible selection of the structural beam position for installing the second limiting member during assembly, and improves the versatility of the first and second limiting members. The fixed connection of the second limiting member to the structural beam ensures a fixed relative position between the second limiting member and the structural beam, reducing the risk of the second limiting member moving during the installation of the first limiting member.

[0015] In some embodiments, the battery device further includes a backstop mechanism for limiting the first limiting member in the second direction. By providing the backstop mechanism, the first limiting member is prevented from sliding outward under vibration conditions, thereby improving the long-term reliability of its limiting function.

[0016] In some embodiments, the anti-retraction mechanism includes a third limiting member, which is movably inserted into the structural beam along a second direction. When the third limiting member is in an extended state relative to the structural beam, a portion of the third limiting member is located on one side of the first limiting member along the second direction, serving to limit the first limiting member in the second direction. When the third limiting member is not pulled out, it can avoid the first limiting member, ensuring smooth installation of the first limiting member. After the first limiting member is installed in place, the third limiting member is pulled out and is in an extended state, restricting the first limiting member's degree of freedom of movement along the second direction and preventing the first limiting member from sliding outward, thereby improving the reliability of the first limiting member's limiting of the battery cell assembly in the second direction.

[0017] In some embodiments, the anti-reverse mechanism further includes a connector, and the third limiting member has a connecting hole. The connector passes through the connecting hole and connects to the first limiting member to limit the first limiting member in a first direction when it is in the extended state. By providing the connector, the third limiting member is constrained by both the structural beam and the connector, thereby providing a more secure limiting constraint for the first limiting member.

[0018] In some embodiments, one of the third limiting member and the first limiting member is provided with a limiting groove, and the other is provided with a limiting block. The limiting block is engaged in the limiting groove to limit the third limiting member in the extended state in the second direction. The limiting groove and the limiting block form a concave-convex fit, restricting the movement of the first limiting member relative to the third limiting member. The third limiting member is further limited by the structural beam, thereby improving the reliability of the first limiting member's limiting of the battery cell assembly in the second direction.

[0019] In some embodiments, the first limiting member has a supporting surface and a limiting surface, the supporting surface and the limiting surface being intersected, and a portion of the third limiting member rests on the supporting surface; the limiting surface is used to limit the maximum stroke of the third limiting member moving out of the structural beam. The intersecting supporting surface and limiting surface form a recess on the first limiting member, which can provide accommodating space for the third limiting member and can control the size of the first limiting member along the second direction.

[0020] In some embodiments, the third limiting member has a flange on the side away from the structural beam, and the flange abuts against the limiting surface. By providing the flange, the structural strength of the third limiting member is enhanced. The flange abuts against the limiting surface, forming an additional contact surface, which can both limit the rotation or tilt of the third limiting member relative to the first limiting member and enhance the constraint between the second surface and the side of the battery cell assembly, preventing the battery cell assembly from moving horizontally within the housing.

[0021] In some embodiments, the anti-retraction mechanism includes a fourth limiting member, which is a resilient locking structure disposed on the first limiting member. The structural beam has a limiting hole, and the fourth limiting member is engaged within the limiting hole. The fourth limiting member enables automatic connection and limiting between the first limiting member and the structural beam, which enhances the limiting stability of the battery cell assembly in the second direction and improves assembly efficiency.

[0022] In some embodiments, the fourth limiting member includes a base, an elastic member, and a pin. The base is fixed to the first limiting member, and the elastic member is disposed between the base and the pin. When the fourth limiting member limits the first limiting member, the pin is inserted into the limiting hole. The elastic member allows the pin to move closer to or further away from the base, enabling the pin to disengage from or engage with the limiting hole without requiring additional installation tools, simplifying operation and improving assembly efficiency.

[0023] In some embodiments, at least one of the second limiting member and the first limiting member has a hollow cavity inside, which can reduce the weight of the limiting member, achieve weight reduction and cost reduction, and help improve the energy density of the battery device; in addition, it can also provide a buffer space, which helps improve the reliability of the battery device.

[0024] In some embodiments, the hollow cavity is filled with a heat exchange medium. By filling the hollow cavity with a heat exchange medium, at least one of the functions of heat insulation, fire prevention, fire extinguishing, and phase change thermal management can be achieved, thereby improving the thermal safety of the battery device and reducing the risk of safety accidents caused by battery thermal runaway.

[0025] Secondly, this application provides an electrical device including the battery described in the above embodiments, the battery being used to provide electrical energy. By employing the battery device as described above, the battery device uses a second limiting member and a first limiting member to lock and fix the battery cell assembly in a first direction and limit it in a second direction, reducing the possibility of large displacement of the battery cell assembly due to expansion and improving the safety and reliability of the battery device.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a partial exploded structural diagram of the battery device provided in an embodiment of this application.

[0029] Figure 2 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application.

[0030] Figure 3 for Figure 2 The diagram shows the interaction of the second limiting member, the first limiting member, and the third limiting member.

[0031] Figure 4 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application.

[0032] Figure 5 for Figure 4 A partial cross-sectional schematic diagram of the battery device is shown.

[0033] Figure 6 for Figure 4 A partial enlarged view of the battery device shown.

[0034] Figure 7 This is a three-dimensional structural diagram of the third limiting member used in some embodiments of this application.

[0035] Figure 8 for Figure 7 The diagram shows a partial structural schematic of the third limiting member.

[0036] Figure 9 This is a three-dimensional structural diagram of the fourth limiting member provided in some embodiments of this application.

[0037] Figure 10 for Figure 9 The exploded structure diagram of the fourth limiting component is shown.

[0038] Figure 11 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application.

[0039] Figure 12 for Figure 11 The diagram shows a partial cross-sectional view of the battery device.

[0040] Figure 13 for Figure 11 The diagram shows a partial exploded structure of the battery device.

[0041] The following are the labeling elements in the figure: 10. Box frame; 11. Structural beam; 20. Battery cell assembly; 21. Battery cell; 30. Second limiting component; 31. First side; 40. First limiting component; 41. Limiting part; 42. Second surface; 43. Third surface; 431. Protrusion; 432. Recess; 44. Supporting surface; 45. Limiting surface; 46. Limiting block; 47. Hollowed-out cavity; 50. Anti-reverse mechanism; 51. Third limiting component; 511. Connecting hole; 52. Connecting component; 53. Fourth limiting component; 531. Base; 532. Elastic component; 533. Pin; 515. Limiting groove; 516. Flanged edge; 60. Interlayer. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In the description of the embodiments of this application, the technical terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] 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.

[0050] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing. The solution of directly integrating battery cells into the casing is widely used because it effectively improves volume utilization.

[0051] During battery device operation, external bumps, vibrations, and the charge-discharge cycles of individual battery cells can cause them to expand and contract, leading to displacement. If the battery cells are not effectively restrained after being fixed within the casing, they may move relative to the casing, resulting in damage to the thermal interface between the battery cell and the casing, fatigue fracture of the connection between the battery cell and the busbar, and even internal short circuits. Therefore, effective restraint and fixation of battery cells are necessary measures to ensure the reliability and safety of the battery device.

[0052] To achieve reliable positioning and fixation of the battery cell assembly, this application provides a battery device. By adding a first limiting member 40 between the battery cell assembly 20 and the housing 10, the battery cell assembly 20 is fixed along a first direction (perpendicular to the height direction of the battery cell assembly 20) by the first limiting member 40, and the limiting part 41 on the first limiting member 40 limits the battery cell assembly 20 in the height direction, thereby achieving fixation and limiting constraint of the battery cell assembly 20 within the housing 10.

[0053] This application provides a battery device, such as... Figure 1 As shown, the enclosure includes a housing 10, a battery cell assembly 20, a second limiting member 30, and a first limiting member 40. The battery cell assembly 20 is disposed within the housing 10. The housing 10 has structural beams 11. Figure 2 , Figure 7 and Figure 12As shown, the first limiting member 40 has a second surface 42 and a third surface 43 disposed opposite to each other, with the second surface 42 abutting against the side of the battery cell assembly 20. The second limiting member 30 has a first surface 31, with the third surface 43 cooperating with the first surface 31, so that the first limiting member 40 presses against the battery cell assembly 20 along the first direction and absorbs the assembly tolerances of the housing 10 and the battery cell assembly 20. The first limiting member 40 has a limiting portion 41, which is located on one side of the battery cell assembly 20 along the second direction, for limiting the battery cell assembly 20 in the second direction. The first direction and the second direction are intersecting.

[0054] The first surface 31 and the third surface 43 are matched in shape, allowing for positional compensation through relative movement or deformation. For example, relative sliding or deformation can occur between the first surface 31 and the third surface 43. In the first limiting member 40, the second surface 42 abuts against the side of the battery cell assembly 20, and the third surface 43 cooperates with the first surface 31 to achieve positional compensation, resulting in a pressing force between the first surface 31 and the third surface 43, and a tight fit between the second surface 42 and the battery cell assembly 20. Thus, the first limiting member 40 is engaged between the second limiting member 30 and the battery cell assembly 20, providing a locking force for the battery cell assembly 20 along the first direction.

[0055] The housing 10 includes a top cover, a structural beam 11, and a bottom plate. The top cover and bottom plate are respectively connected to the structural beam 11. The housing 10 has an internal cavity to house the battery cell assembly 20. In some embodiments, the bottom plate and the structural beam 11 are an integral structure. After the battery cell assembly 20 is installed, the top cover is closed. The top surface of the battery cell assembly 20 refers to the side of the battery cell assembly 20 that faces away from the bottom plate.

[0056] The structural beam 11 is a beam-type structural component constituting the housing 10. It can be a horizontal beam or a vertical beam, used to enclose and form a cavity for accommodating the battery cell assembly 20. It should be noted that the structural beam 11 can be a horizontal or vertical beam defining the position of the battery cell assembly 20 within the housing 10, such as an expansion beam. The structural beam 11 can be made of aluminum profiles, steel stampings, composite material extrusions, or castings. Optionally, the structural beam 11 can be a frame beam enclosing the housing 10, used to define the cavity for accommodating the battery cell assembly 20 and other components of the battery device, and to reduce the impact of the external environment on the battery cell assembly 20 and other components. Optionally, the structural beam 11 can also be a horizontal or vertical beam disposed inside the housing 10, used to divide the cavity into multiple sub-cavities, while improving the overall structural strength of the housing 10. For example, the structural beam 11 can be an expansion beam, which can abut against the large surface of the battery cell 21 in the battery cell assembly 20 to absorb the expansion force generated by the battery cell assembly 20 during operation.

[0057] The battery device mentioned in this application embodiment may include one or more battery cell assemblies 20 for providing voltage and capacity. Each battery cell assembly 20 may include multiple rows of battery cells arranged along a first direction, and each row may include multiple battery cells 21 stacked along a third direction. Optionally, two rows of battery cells at their ends along the first direction of the battery cell assembly 20 may each be provided with a first limiting member 40, each first limiting member 40 abutting against the battery cell row. Furthermore, adjacent rows of battery cells are fixedly connected along the first direction. Specifically, adjacent rows of battery cells can be connected by a connecting strip extending along a third direction, the connecting strip connecting the shoulders of the battery cells in the adjacent rows. Multiple battery cells 21 in the same row are connected together in series, parallel, or mixed connection via a busbar. Mixed connection of multiple battery cells 21 means that some of the multiple battery cells 21 are connected in series and others in parallel. When there are multiple battery cell assemblies 20, at least one battery cell assembly 20 is limited in the height direction by a limiting portion 41 on the first limiting member 40.

[0058] Each battery cell 21 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 21 can be flat, cuboid, or other shapes.

[0059] The first direction (Y direction) is parallel to the bottom surface of the housing 10, and it can be aligned with either the length direction or the width direction of the battery cell 21. For example, as shown... Figure 1 and Figure 2 As shown, the first limiting member 40 abuts against the side of the battery cell 21 extending along the width direction, and the first direction is consistent with the length direction of the battery cell 21. For example, the first limiting member 40 abuts against the side of the battery cell 21 extending along the length direction, and the first direction is consistent with the width direction of the battery cell 21.

[0060] Understandably, the abutment between the second surface 42 and the battery cell assembly 20 can be direct or indirect, as long as the first limiting member 40 presses against the battery cell assembly 20, forming a tight fit with the outer surface of the battery cell 21. By abutting against the battery cell assembly 20, the translational freedom of the battery cell 21 in the first direction (i.e., the Y direction) can be restricted, thus locking and fixing the battery cell assembly 20 within the housing 10. "Pressing" can refer to the first limiting member 40 tightly abutting against the corresponding side wall of the battery cell assembly 20, and applying a continuous pre-tightening force along the first direction to maintain a gapless, constrained fit. This pressure action can, on the one hand, limit the lateral displacement of the battery cell assembly 20 along the first direction, and on the other hand, provide a positive pressure basis for the first limiting member 40 to limit the battery cell assembly 20 in the second and third directions, thereby reducing the risk of positional displacement of the battery cell assembly 20 under vibration, impact and expansion of the battery cell 21, and improving the overall structural reliability.

[0061] The first direction, the second direction, and the third direction intersect each other and are not coplanar. Two of the first direction, the second direction, and the third direction can be perpendicular, form an obtuse angle, or an acute angle. For example, the first direction (Y direction), the second direction (Z direction), and the third direction (X direction) are perpendicular to each other.

[0062] The second direction (Z direction) can be perpendicular to the bottom surface of the housing 10 and consistent with the height direction of the battery cell 21.

[0063] The limiting part 41 is located on one side of the battery cell assembly 20 in the second direction, which can further limit the battery cell assembly 20 in the second direction, while allowing the battery cell assembly 20 to generate a small adaptive displacement in the second direction (Z direction) due to charging and discharging expansion, thereby reducing the risk of damage to the battery cell assembly 20 caused by rigid constraints.

[0064] The second limiting member 30 is disposed on the inner side of the structural beam 11 and is used to cooperate with the first limiting member 40. It should be noted that the fact that the second limiting member 30 is disposed on the structural beam 11 does not necessarily mean that the two can only be independent parts; it can also include the case that the two are an integral structure.

[0065] The second limiting member 30 has a first surface 31 on the side facing the battery cell assembly 20. A receiving space is formed between the first surface 31 and the side of the battery cell assembly 20, which is used to accommodate at least a portion of the first limiting member 40. Thus, by means of the cooperation between the first surface 31 and the third surface 43, the machining tolerances of the housing 10 and the assembly tolerances of the battery cell assembly 20 can be absorbed during assembly, reducing assembly difficulties or stress concentrations caused by dimensional deviations; at the same time, by means of the cooperation between the first surface 31 and the third surface 43, the first limiting member 40 is indirectly mounted on the structural beam 11 through the second limiting member 30.

[0066] For example, during assembly, multiple battery cells 21 are first fixed into a whole by binding, bonding, or other means to form a battery cell assembly 20; then, the second limiting member 30 is assembled with the structural beam 11. Next, the battery cell assembly 20 is clamped in, thereby forming an accommodating space between the battery cell assembly 20 and the second limiting member 30. Then, the first limiting member 40 is inserted into the accommodating space, filling the accommodating space to lock the battery cell assembly 20 in the first direction. Simultaneously, the limiting part 41 is located above the battery cell assembly 20 along the second direction, reducing the possibility of the battery cell assembly 20 shifting along the second direction.

[0067] In related technologies, interference fit is often used to install battery cells into the housing. When inserting the battery cells, the working space of the clamping fixture is limited, requiring precise positioning and insertion within this confined space. This process makes it difficult to match the clamping force of the fixture with the pre-deformation of the battery cells, easily leading to compression of the battery cells during actual assembly, causing structural damage or performance degradation. However, the battery device provided in this application allows for the formation of an accommodating space between the side of the battery cell 20 and the second limiting member 30 during assembly. This accommodating space provides ample room for the clamping fixture during the insertion of the battery cell 20 into the housing, facilitating smooth operation of the clamping fixture.

[0068] For example, during assembly, the battery cell assembly 20 and the first limiting member 40 can be assembled as a whole and then simultaneously clamped into the housing 10 where the second limiting member 30 is installed. Alternatively, the battery cell assembly 20 and the first limiting member 40 can be assembled as a whole and then simultaneously clamped into the housing 10, and finally the second limiting member 30 can be inserted and installed.

[0069] Optionally, the second limiting member 30 and the first limiting member 40 are provided as a set, and multiple sets are provided. For example, the battery device is a square battery, and structural beams 11 are distributed around the perimeter of the housing 10. A set of second limiting members 30 and first limiting members 40 is provided on the inner side of at least one structural beam 11. For example, a set of second limiting members 30 and first limiting members 40 is provided on the inner side of one of the structural beams 11. For example, a set of second limiting members 30 and first limiting members 40 is provided on the inner side of two opposite structural beams 11 respectively. For example, a set of second limiting members 30 and first limiting members 40 is provided on the inner side of two adjacent structural beams 11 respectively. For example, a set of second limiting members 30 and first limiting members 40 is provided on the inner side of all four structural beams 11, etc.

[0070] The battery device provided in this application embodiment has a first limiting member 40 connected to the structural beam 11. By abutting against the side of the battery cell assembly 20 through the second surface 42 of the first limiting member 40, the first limiting member 40 locks and fixes the battery cell assembly 20 in a first direction. The limiting portion 41 on the first limiting member 40 is located above the battery cell assembly 20 in a second direction, which reduces the possibility of the battery cell assembly 20 shifting in the second direction, improving the reliability and safety of the battery device. The first surface 31 and the third surface 43 cooperate to absorb the assembly tolerances of the housing 10 and the battery cell assembly 20, facilitating the assembly of the battery cell assembly 20 and the housing 10, and reducing the tolerance requirements for the housing 10 and the battery cell assembly 20, thus helping to reduce manufacturing costs.

[0071] In some embodiments, a plurality of battery cells 21 in the battery cell assembly 20 are arranged along a third direction ( Figure 1 Arranged in the X direction, the limiting part 41 is along the third direction ( Figure 1 Extending in the X direction, the limiting part 41 simultaneously restricts multiple battery cells 21 in the second direction ( Figure 1 The height direction is limited by a limit in the Z-direction to reduce the risk of limit failure due to loosening between individual battery cells 21. The first, second, and third directions intersect each other but are not coplanar.

[0072] In some embodiments, the limiting portion 41 is a protruding structure provided on the side of the first limiting member 40 facing the battery cell assembly 20. Exemplarily, the first limiting member 40 has a side extending in a third direction, and the limiting portion 41 extends from one end of the side in the third direction to the other end, such that the extension length of the limiting portion 41 is substantially the same as the length of the first limiting member 40 in the third direction. Alternatively, there may be multiple limiting portions 41, which are spaced apart on the first limiting member 40 in the third direction.

[0073] For example, the third direction is orthogonal to the second direction, and the second direction is orthogonal to the first direction.

[0074] In related technologies, battery cells and housings are typically connected by bottom-applied adhesive bonding. The uniformity of the adhesive layer thickness is limited by the positioning accuracy of the adhesive application equipment and the stability of process parameters, making precise control difficult. This, in turn, affects the consistency of the height of each battery cell and the heat transfer efficiency between the battery cell and the housing. The battery device provided in this application embodiment has a limiting part 41 extending in the same direction as the battery cell 21. The limiting part 41 can simultaneously limit multiple battery cells 21 in a second direction, eliminating the need for structural adhesive at the bottom and reducing the impact of inconsistent structural adhesive thickness on the height consistency of the battery cells 21.

[0075] Furthermore, in the method of bottom-applying adhesive to fix the battery cells and the housing, the curing cycle of conventional structural adhesives typically requires 2 to 8 hours, slowing down the production line and increasing the cost of work-in-process inventory. Secondly, structural adhesives are expensive, and excessive overflow or positioning deviations during the application process can lead to material waste. Additionally, adhesive bonding is irreversible; if battery cells need repair or replacement, destructive disassembly is required, severely limiting the maintainability of the battery device. The battery device provided in this application embodiment achieves locking and fixing in the first direction by pressing the battery cell assembly 20 against the first limiting member 40, eliminating the need for structural adhesive bonding and eliminating the need to wait for curing during assembly, resulting in high production efficiency and helping to reduce costs. Moreover, the first limiting member 40 and the battery cell assembly 20 are separate; after releasing the limiting member, the battery cell assembly 20 can be removed from the housing 10, facilitating repair or replacement of the battery cells 21 and improving maintainability.

[0076] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first surface 31 and the third surface 43 are parallel planes. The first surface 31 and the third surface 43 are inclined relative to the second direction (Z direction).

[0077] For example, both are wedge-shaped inclined surfaces. Under vibration conditions, the wedge-shaped inclined surfaces allow for slight sliding, absorb energy, reduce impact transmission, and produce an adaptive clamping effect. When the first limiting member 40 is inserted into the accommodating space, the wedge-shaped inclined surfaces guide the first limiting member 40 to gradually press against the second limiting member 30. The deeper the first limiting member 40 is inserted, the tighter the second limiting member 30 and the first limiting member 40 are pressed together. Thus, the insertion depth and clamping force of the first limiting member 40 can be automatically adjusted within a certain tolerance range to achieve tolerance self-adaptation. When the size of the battery cell assembly 20 is too large, resulting in a smaller accommodating space after being installed in the housing 10, the insertion depth of the first limiting member 40 is shallower; when the size of the battery cell assembly 20 is too small, resulting in a larger accommodating space after being installed in the housing 10, the insertion depth of the first limiting member 40 is deeper. Therefore, even if there are deviations in the manufacturing dimensions of the housing 10 or the battery cell assembly 20, the limiting part 41 can still restrict the height direction of the battery cell assembly 20.

[0078] The direction pointing towards the limiting portion 41 in the second direction is defined as the positive direction of the second direction. In some embodiments, the positive direction along the Z direction ( Figure 2 In the Z-direction (upward), the first surface 31 and the third surface 43 are inclined towards the side closer to the battery cell relative to the second direction. Therefore, along the positive Z-direction, the thickness of the second limiting member 30 gradually increases along the Y-direction, while the thickness of the first limiting member 40 gradually decreases along the Y-direction. During assembly, the first limiting member 40 is first assembled with the battery cell assembly 20, then clamped into the housing 10, and finally the second limiting member 30 is inserted.

[0079] In some embodiments, along the positive direction of the second direction, the first surface 31 is inclined away from the side of the battery cell assembly 20 relative to the second direction. The thickness of the first limiting member 40 in the portion between the second limiting member 30 and the battery cell assembly 20 gradually increases along the positive direction of the second direction. During assembly, the second limiting member 30 is first connected to the structural beam 11, and then the battery cell assembly 20 and the first limiting member 40 are sequentially installed. Alternatively, after connecting the second limiting member 30 to the structural beam 11, the assembly formed by the battery cell assembly 20 and the first limiting member 40 is simultaneously clamped in.

[0080] For example, both the second limiting member 30 and the first limiting member 40 are wedge-shaped. After assembly, the second surface 42 abuts against the side of the battery cell assembly 20, and the first surface 31 and the third surface 43 are in contact with each other and can slide relative to each other, thereby locking the battery cell assembly 20 along the first direction and absorbing assembly tolerances.

[0081] The first surface 31 and the third surface 43 cooperate with each other and are in contact. The first surface 31 is inclined and the thickness of the first limiting member 40 gradually increases along the second direction. During assembly, the small end of the first limiting member 40 enters the box first and is guided by the cooperation of the first surface 31 and the third surface 43 to facilitate assembly.

[0082] As the first limiting member 40 is inserted deeper into the accommodating space, the first surface 31 and the third surface 43 guide the first limiting member 40 to gradually press against the second limiting member 30. The deeper the first limiting member 40 is inserted, the tighter the second limiting member 30 and the first limiting member 40 are pressed together. Thus, the insertion depth and pressing force of the first limiting member 40 can be automatically adjusted within a certain tolerance range to achieve tolerance self-adaptation.

[0083] Figure 12 This is a cross-sectional view of a partial structure of a battery device provided in some embodiments of this application, wherein only a portion of the limiting portion 41 is shown, so as to show the cross-section of the second limiting member 30 and the first limiting member 40. Figure 12 This is a partial enlarged view of a battery device provided in some embodiments of this application, wherein only one battery cell 21 is shown as an example in the battery cell assembly 20. See also Figure 12 and Figure 13 Both the first surface 31 and the third surface 43 include a protrusion 431 and a recess 432. The protrusion 431 and the recess 432 extend along a second direction and are spaced apart along a direction perpendicular to the second direction. The protrusion 431 in the first surface 31 is inserted into the recess 432 of the third surface 43, and the protrusion 431 in the third surface 43 is inserted into the recess 432 of the first surface 31. The first surface 31 and the third surface 43 can press against each other and generate elastic deformation to absorb assembly tolerances between the housing 10 and the battery cell assembly 20. During assembly, the protrusion 431 and the corresponding recess 432 can provide guidance for the assembly of the first limiting member 40.

[0084] The first surface 31 and the third surface 43 are composed of a series of alternating protrusions 431 and recesses 432, forming a periodically undulating contour surface. If the protrusions 431 and recesses 432 are spaced apart along the second direction of the battery cell assembly 20, the protrusions 431 will hinder the downward insertion of the first limiting member 40 during insertion into the receiving space. The protrusions 431 and recesses 432 are alternately arranged along a direction perpendicular to the second direction, making the insertion of the first limiting member 40 into the receiving space smoother and facilitating assembly. When the first surface 31 and the third surface 43 mate, the protrusions 431 and recesses 432 on the two mating surfaces interlock, forming multi-point contact.

[0085] When subjected to horizontal impact or vibration, the protrusion 431 is compressed, and the recess 432 provides deformation space for the deformation of the protrusion 431. Thus, the first surface 31 and the third surface 43 absorb energy through the elastic deformation between the protrusion 431 and the recess 432, providing buffer protection and reducing the impact load transmitted to the battery cell assembly 20.

[0086] See Figure 12 and Figure 13 Both the first surface 31 and the third surface 43 are wavy surfaces, which absorb tolerances through compression deformation and provide buffering.

[0087] The cross-section of the waveform surface is in the form of a sine wave, triangular wave, circular arc wave, or trapezoidal wave. The periodic structure of the waveform surface automatically guides alignment during relative sliding, making the assembly process smoother. At the same time, the elastic deformation of the waveform surface absorbs the dimensional deviations of the housing 10 and the battery cell assembly 20, reducing the possibility of jamming or excessive assembly stress caused by dimensional deviations.

[0088] In some embodiments, both the second limiting member 30 and the first limiting member 40 are corrugated plates. For example... Figure 12 and Figure 13 As shown, the second surface 42 includes a plurality of spaced planar segments to abut against the side of the battery cell assembly 20.

[0089] In some embodiments of this application, please refer to Figures 11 to 13 A sandwich 60 is provided between the first limiting member 40 and the side of the battery cell assembly 20 and / or between the second limiting member 30 and the structural beam 11.

[0090] When the second limiting member 30 and the structural beam 11 are separately configured, a sandwich 60 can be provided only between the second limiting member 30 and the structural beam 11 or between the first limiting member 40 and the battery cell assembly 20. Alternatively, sandwich 60s can be provided between the first limiting member 40 and the side of the battery cell assembly 20, and between the second limiting member 30 and the structural beam 11. For example, a sandwich 60 is provided between the first limiting member 40 and the side of the battery cell assembly 20. Or, a sandwich 60 is provided between the second limiting member 30 and the structural beam 11. Another example is that a sandwich 60 is provided on the side of only one of the second limiting member 30 and the first limiting member 40. Optionally, such as... Figure 8 , Figure 12 and Figure 13 As shown, sandwich layers 60 are provided between the second limiting member 30 and the side of the battery cell assembly 20, and between the second limiting member 30 and the structural beam 11. The sandwich layers 60 between the second limiting member 30 and the side of the battery cell assembly 20 and between the second limiting member 30 and the structural beam 11 can be made of the same or different materials.

[0091] When the second limiting member 30 and the structural beam 11 are an integral structure, the interlayer 60 is disposed between the first limiting member 40 and the side of the battery cell assembly 20.

[0092] By setting a sandwich 60 between the first limiting member 40 and the battery cell assembly 20 and / or the structural beam 11 and the second limiting member 30, the existing fitting gap is utilized to flexibly expand the function without changing the main structure and improve the safety protection function of the battery device.

[0093] In some optional embodiments of this application, the interlayer 60 includes at least one of a buffer layer, an insulating layer, a heat insulation layer, and a flame retardant layer.

[0094] The buffer layer includes, but is not limited to, foam and rubber. It absorbs vibration and impact energy, reducing the mechanical stress on the battery cell.

[0095] The insulating layer includes, but is not limited to, insulating film and insulating paper, to prevent electrical conduction between the outer casing of the battery cell 21 and the housing 10, thereby reducing the risk of short circuit.

[0096] The heat insulation layer includes, but is not limited to, aerogel and ceramic fiber, which blocks heat transfer between the battery cell assembly 20 and the housing 10 and delays thermal runaway.

[0097] Flame-retardant layers include, but are not limited to, flame-retardant plastics and mica, which can suppress the spread of flames or self-extinguish when exposed to fire, thereby improving the fire resistance rating of the battery device.

[0098] The interlayer 60 may be a single functional layer or include multiple functional layers. For example, interlayer 60 may be a cushioning layer made of foam. For example, interlayer 60 may be an organosilicon foam layer, which can provide both heat insulation and insulating cushioning. For example, interlayer 60 may include a silicone foam layer and a rigid rubber layer, which can meet the requirements of insulation and flame retardancy while providing cushioning.

[0099] In some embodiments, the interlayer 60 includes one of a buffer layer, an insulating layer, a heat insulation layer, and a flame-retardant layer, forming a single functional layer. Exemplarily, a buffer layer is provided as an interlayer 60 between the first limiting member 40 and the side of the battery cell assembly 20, and between the second limiting member 30 and the structural beam 11. Optionally, the interlayer 60 between the first limiting member 40 and the side of the battery cell assembly 20, and the interlayer 60 between the second limiting member 30 and the structural beam 11, are made of the same material. For example, both interlayers 60 are buffer layers made of silicone foam. Exemplarily, interlayers 60 are provided between the first limiting member 40 and the side of the battery cell assembly 20, and between the second limiting member 30 and the structural beam 11, with the two interlayers 60 employing different functional layers. For example, a heat insulation layer is provided between the first limiting member 40 and the side of the battery cell assembly 20, and a buffer layer is provided between the second limiting member 30 and the structural beam 11.

[0100] In some embodiments, the interlayer 60 includes multiples of a buffer layer, an insulating layer, a heat insulation layer, and a flame-retardant layer to form a composite functional layer. For example, a silicone foam layer and a rigid rubber layer are disposed between the first limiting member 40 and the side of the battery cell assembly 20, wherein the silicone foam layer forms a heat insulation layer and the rigid rubber layer forms a heat insulation layer, thereby forming a composite functional layer between the first limiting member 40 and the side of the battery cell assembly 20.

[0101] The battery device provided in this application embodiment can be selected from one or more of the buffer layer, insulating layer, heat insulation layer and flame retardant layer to form the interlayer 60 according to the actual application scenario and safety level requirements of the battery device, so as to achieve targeted optimization.

[0102] In some embodiments of this application, the second limiting member 30 and the structural beam 11 are integrally formed. For example, the second limiting member 30 and the structural beam 11 are integrally formed by extrusion, casting or injection molding.

[0103] For example, the inner side of the structural beam 11 has a wedge-shaped portion, and the wedge-shaped inclined surface on the wedge-shaped portion forms the first surface 31 of the second limiting member 30; the third surface 43 is parallel to the first surface 31 and can slide with the first surface 31 to absorb tolerances. Alternatively, the structural beam 11 has a wavy inner wall, which serves as the first surface 31 of the second limiting member 30 and, when engaged with the third surface 43, can produce elastic deformation to absorb tolerances.

[0104] By setting the second limiting member 30 and the structural beam 11 as an integrated structure, the number of independent parts can be reduced, the assembly process can be simplified, the risk of relative displacement or loosening at the connection between the second limiting member 30 and the structural beam 11 can be reduced, and the reliability of the limiting member under long-term vibration conditions can be improved.

[0105] In some embodiments of this application, the second limiting member 30 and the structural beam 11 are separately configured.

[0106] For example, the second limiting member 30 and the structural beam 11 are connected together by fasteners or adhesives.

[0107] For example, the second limiting member 30 and the structural beam 11 are detachably connected by screws or other intermediate parts. Alternatively, the second limiting member 30 and the structural beam 11 are connected by a snap-fit ​​or positioning connection. For instance, the second limiting member 30 has a positioning hole, and the structural beam 11 has a positioning post, which is inserted into the positioning hole. Or, the structural beam 11 has a slot, and the second limiting member 30 is inserted into the slot. After the first limiting member 40 is inserted into the accommodating space, the second limiting member 30 is compressed, thus fixing the relative position between the second limiting member 30 and the structural beam 11.

[0108] By separating the second limiting member 30 and the structural beam 11, the processing and manufacturing of the structural beam 11 is facilitated, and the structural beam 11 on which the second limiting member 30 is installed can be flexibly selected during assembly, making the structural beam 11 and the second limiting member 30 more versatile.

[0109] In some embodiments, such as Figure 3 and Figure 6 As shown, the battery device also includes a backstop mechanism 50, which is used to limit the first limiting member 40 in the second direction to prevent the first limiting member 40 from sliding out of the accommodating space.

[0110] The anti-reverse mechanism 50 includes, but is not limited to, mechanical methods such as rotating buckles, elastic pins, and connecting bolts. For example, the anti-reverse mechanism 50 includes a rotating buckle, which is installed on the structural beam 11. When the first limiting member 40 and the second limiting member 30 are assembled in place, the buckling part of the rotating buckle is unscrewed and inserted into the pre-reserved limiting hole on the first limiting member 40 to achieve self-locking and reduce the possibility of the first limiting member 40 loosening under vibration conditions.

[0111] Without the anti-slip mechanism 50, the first limiting member 40 relies solely on friction or interference fit with the second limiting member 30, and long-term vibration may cause it to gradually slip outward. Once the first limiting member 40 slips outward, the limiting effect of the limiting part 41 on the battery cell assembly 20 along the second direction will weaken or even disappear. Therefore, this embodiment of the application sets up an anti-slip mechanism 50 to fix the relative position of the first limiting member 40 and the structural beam 11, preventing the first limiting member 40 from slipping outward under vibration conditions and ensuring the long-term reliability of its limiting function.

[0112] In some embodiments, such as Figure 2 and Figure 3 As shown, the anti-reverse mechanism 50 includes a third limiting member 51, which is movably inserted into the structural beam 11 along a first direction. When the third limiting member 51 is in an extended state relative to the structural beam 11, a portion of the third limiting member 51 is located on one side of the first limiting member 40 along a second direction, and is used to limit the first limiting member 40 in the second direction.

[0113] The third limiting member 51 can be a strip plate that can be movably inserted into the structural beam 11. Optionally, the structural beam 11 is provided with a mounting hole, and the third limiting member 51 is inserted into the mounting hole and can move along the axis of the mounting hole.

[0114] In order to prevent the third limiting member 51 from falling out of the structural beam 11, the end of the third limiting member 51 located inside the structural beam 11 has a stop portion.

[0115] When the third limiting member 51 is in the extended state, the other end of the third limiting member 51 extends above the first limiting member 40.

[0116] When installing the first limiting member 40, the third limiting member 51 is inserted deeply into the structural beam 11 to avoid obstructing the insertion of the first limiting member 40 into the receiving space. After the first limiting member 40 is installed in place, the third limiting member 51 is pulled along the first direction, so that a part of the third limiting member 51 is positioned on the first limiting member 40, thereby constraining the first limiting member 40 in the second direction and preventing it from sliding outward. When it is necessary to disassemble the battery cell 21, the third limiting member 51 is pushed into the structural beam 11, releasing the third limiting member 51 from restricting the first limiting member 40.

[0117] The battery device provided in this application embodiment has a third limiting member 51 that is movably inserted into the structural beam 11. When the third limiting member 51 is not pulled out, it can avoid the first limiting member 40, ensuring that the first limiting member 40 is installed smoothly. After the first limiting member 40 is installed in place, the third limiting member 51 is pulled out to restrict the degree of freedom of movement of the first limiting member 40 in the second direction, preventing the first limiting member 40 from sliding outward, thereby improving the reliability of the first limiting member 40 in limiting the battery cell assembly 20 in the second direction.

[0118] In some embodiments, such as Figure 2 and Figure 3 As shown, the anti-reverse mechanism 50 also includes a connector 52. The third limiting member 51 is provided with a connecting hole 511. The connector 52 passes through the connecting hole 511 and is connected to the first limiting member 40 to limit the third limiting member 51 in the first direction when it is in the extended state.

[0119] For example, the connector 52 is a connecting bolt, which passes through the connecting hole 511 and is threadedly connected to the first limiting member 40. When it is necessary to disassemble the battery cell 21, the connector 52 is removed, and then the third limiting member 51 is pushed into the structural beam 11. For example, the connector 52 is an elastic clip, which is fixedly installed on the first limiting member 40. After the third limiting member 51 is pulled out, the elastic clip is engaged in the connecting hole 511. When it is necessary to disassemble the battery cell 21, an external force pushes the third limiting member 51, causing the elastic clip to disengage from the connecting hole 511 and pushing the third limiting member 51 into the structural beam 11.

[0120] By setting the connector 52, the stability of the connection between the third limiting member 51 and the structural beam 11 is improved, so that the third limiting member 51 is jointly constrained by the structural beam 11 and the connector 52, thereby providing a more reliable limiting constraint for the first limiting member 40.

[0121] like Figure 4 , Figure 5 and Figure 6As shown, one of the third limiting member 51 and the first limiting member 40 is provided with a limiting groove 515, and the other is provided with a limiting block 46. The limiting block 46 is fitted into the limiting groove 515 to limit the third limiting member 51 in the first direction when it is in the extended state.

[0122] For example, the third limiting member 51 is provided with a limiting groove 515, and the first limiting member 40 is provided with a limiting block 46.

[0123] For example, a limiting block 46 is provided on the third limiting member 51, and a limiting groove 515 is provided on the first limiting member 40.

[0124] For example, the third limiting member 51 is provided with both a limiting groove 515 and a limiting block 46, and the first limiting member 40 is provided with both a limiting block 46 and a limiting groove 515, with the limiting block 46 and the limiting groove 515 being provided accordingly.

[0125] For example, there are multiple limiting grooves 515, which are spaced apart along a third direction on the third limiting member 51, so that the clamping connection force between the third limiting member 51 and the first limiting member 40 is more evenly distributed. For example, the third limiting member 51 is a plate with multiple limiting grooves 515 on one side edge.

[0126] The limiting groove 515 and the limiting block 46 are adapted to achieve snap-fit ​​fixation. For example, the limiting groove 515 is a square groove, and the limiting block 46 is a square block. For example, the limiting groove 515 is an arc-shaped groove, and the limiting block 46 is an arc-shaped protrusion with the same curvature as the arc-shaped groove.

[0127] The limiting groove 515 and the limiting block 46 form a concave-convex fit, which provides a constraint for the movement of the first limiting member 40 relative to the third limiting member 51. The third limiting member 51 is limited by the structural beam 11, thereby providing a more stable constraint for the limiting of the first limiting member 40 along the second direction.

[0128] In some embodiments, the first limiting member 40 has a supporting surface 44 and a limiting surface 45, which are arranged intersectingly. A portion of the third limiting member 51 rests on the supporting surface 44, and the limiting surface 45 is used to limit the maximum stroke of the third limiting member 51 as it moves out of the structural beam 11.

[0129] For example, the support surface 44 is perpendicular to the limiting surface 45. For instance, the first limiting member 40 has an L-shaped stepped surface that includes the vertically connected support surface 44 and limiting surface 45. The limiting surface 45 is opposite to the structural beam 11 and can limit the maximum travel of the third limiting member 51 as it moves out of the structural beam 11. That is, as the third limiting member 51 moves out of the structural beam 11, it gradually approaches the limiting surface 45 and abuts against it. Optionally, the support surface 44 is positioned lower than the limiting portion 41. Compared to a configuration where the support surface 44 is higher than the limiting portion 41, this reduces the dimension of the first limiting member 40 in the second direction, thereby helping to control the dimension in the height direction of the battery device.

[0130] In the case where the anti-reverse mechanism 50 includes a connector 52, for example, as follows: Figure 2 and Figure 3 As shown, the connector 52 is mounted on the support surface 44, and the axis of the connecting hole 511 extends along the height direction of the battery cell assembly 20. Exemplarily, the connector 52 is disposed on the limiting surface 45, and the axis of the connecting hole 511 is perpendicular to the second direction.

[0131] When the third limiting member 51 is provided with a limiting groove 515 and the first limiting member 40 is provided with a limiting block 46, for example, as follows: Figure 4 and Figure 5 As shown, a portion of the third limiting member 51 is located above the support surface 44, and the limiting block 46 protrudes from the limiting surface 45 and is inserted into the limiting groove 515, thereby restricting the degree of freedom of movement of the third limiting member 51 along the first direction. For example, the limiting block 46 protrudes from the support surface 44, which can also restrict the degree of freedom of movement of the third limiting member 51 along the first direction.

[0132] The support surface 44 is located below the third limiting member 51, and the limiting surface 45 can limit the maximum stroke of the third limiting member 51 from the structural beam 11. The limiting surface 45 and the support surface 44 provide accommodating space for the third limiting member 51.

[0133] In some embodiments, the end face of the third limiting member 51 away from the structural beam 11 has a flange 516, and the flange 516 abuts against the limiting surface 45.

[0134] The flange 516 can be either L-shaped or flat.

[0135] For example, the flange 516 extends from one end to the other along the edge of the third stopper 51. For instance, as... Figure 7 and Figure 8As shown, the limiting groove 515 is notched and disposed on the edge of the third limiting member 51. The flange 516 is disposed along the groove wall of the limiting groove 515, so that the limiting groove 515 has a certain depth along the height direction of the battery cell assembly 20, making the fit between the limiting block 46 and the limiting groove 515 more stable. For example, the flange 516 is arranged in segments on the edge of the third limiting member 51, and there is a gap between two adjacent flange segments 516.

[0136] By setting the flange 516, the cross-sectional area of ​​the edge of the third limiting member 51 is increased, the bending stiffness is improved, and the possibility of the third limiting member 51 bending and deforming under force is reduced. With the flange 516 abutting against the limiting surface 45, an additional contact surface is formed, which can not only restrict the rotation or deflection of the third limiting member 51 relative to the first limiting member 40, but also enhance the constraint between the second surface 42 and the side of the battery cell assembly 20, reducing the possibility of the battery cell assembly 20 moving in the first direction within the housing 10.

[0137] In some embodiments of this application, the anti-reverse mechanism 50 includes a fourth limiting member 53, which is a resilient locking head structure disposed on the first limiting member 40. The structural beam 11 is provided with a limiting hole, and the fourth limiting member 53 is engaged in the limiting hole.

[0138] The fourth limiting member 53 is disposed on the first limiting member 40. After the first limiting member 40 is installed in place, the fourth limiting member 53 is snapped into the limiting hole to realize the connection between the first limiting member 40 and the structural beam 11, thereby providing a more stable limiting for the battery cell assembly 20 in the second direction.

[0139] Optionally, multiple fourth limiting members 53 are provided. For example, the fourth limiting members 53 are arranged at intervals along the length direction of the first limiting member 40, and the structural beam 11 is provided with a limiting hole for each fourth limiting member 53.

[0140] Because the fourth limiting member 53 is a flexible locking structure, it accumulates elastic force during assembly. When aligned with the limiting hole, the elastic force is released, causing the fourth limiting member 53 to engage within the limiting hole. This enables automatic connection between the first limiting member 40 and the structural beam 11 during assembly, resulting in more efficient assembly.

[0141] The limiting hole can be directly set on the structural beam 11 or on the second limiting member 30, as long as the first limiting member 40 and the structural beam 11 can be connected by the cooperation of the fourth limiting member 53 and the limiting hole.

[0142] like Figure 9 and Figure 10As shown, the fourth limiting member 53 includes a base 531, an elastic member 532, and a pin 533. The base 531 is fixed to the first limiting member 40, and the elastic member 532 is disposed between the base 531 and the pin 533. When the fourth limiting member 53 limits the first limiting member 40 in the second direction, the pin 533 is inserted into the limiting hole.

[0143] For example, the first limiting member 40 is provided with an insertion hole, and the base 531 is fixedly inserted into the insertion hole. The base 531 is provided with a blind hole, the elastic member 532 is accommodated at the bottom of the blind hole, and the pin 533 is inserted into the blind hole to press the elastic member 532.

[0144] During the process of the first limiting member 40 being installed into the housing 10, the elastic member 532 retracts, and the pin 533 retracts inward to avoid obstructing the installation of the first limiting member 40. When the limiting hole is aligned with the pin 533, the elastic member 532 releases its elastic force to automatically push the pin 533 into the limiting hole, thus constraining the relative position of the first limiting member 40 and the structural beam 11.

[0145] In this embodiment, the fourth limiting member 53 includes a base 531, an elastic member 532, and a pin 533. The elastic member 532 allows the pin 533 to move closer to or further away from the base 531, so that the pin 533 can be dislodged from the limiting hole or inserted into the limiting hole. No additional installation tools are required, the operation is simple, and it helps to improve assembly efficiency.

[0146] Please refer to Figure 5 At least one of the second limiting member 30 and the first limiting member 40 has a hollow cavity 47 inside.

[0147] In some embodiments, only the second limiting member 30 has a hollow cavity 47 inside. In some embodiments, only the first limiting member 40 has a hollow cavity 47 inside. In some embodiments, both the second limiting member 30 and the first limiting member 40 have hollow cavities 47 inside. Figure 5 As shown, both the interior of the second limiting member 30 and the interior of the first limiting member 40 have multiple hollow cavities 47. The multiple hollow cavities 47 are arranged in a grid or honeycomb pattern to reduce the weight of the limiting member while ensuring the structural strength and rigidity of the limiting member.

[0148] By providing a hollow cavity 47 inside at least one of the second limiting member 30 and the first limiting member 40, the weight of the limiting member can be reduced, thereby reducing weight and cost, and improving the energy density of the battery device.

[0149] In some embodiments of this application, the hollow cavity 47 is filled with a heat exchange medium, which is used to achieve at least one function among heat insulation, fire prevention, fire extinguishing and phase change heat management.

[0150] Optionally, the heat exchange medium includes, but is not limited to, mica powder, ceramic fiber, aerogel, flame-retardant foam, hydrogel, paraffin wax, fatty acids, hydrated salts, and composite phase change materials. For example, the heat exchange medium includes aerogel, which can form a thermal barrier to block the heat diffusion from the battery cell assembly 20 to the housing 10, delaying heat spread, and can also form a protective layer under high temperature or open flame conditions to suppress flame combustion. For example, the heat exchange medium includes hydrogel, which releases a fire extinguishing medium under thermal triggering conditions to achieve active fire extinguishing. For example, the heat exchange medium includes perfluorohexanone microcapsules, which rupture and release perfluorohexanone when the temperature inside the housing 10 reaches a preset threshold, achieving automatic fire extinguishing through a combination of vaporization heat absorption, chemical inhibition, and oxygen isolation. For example, the heat exchange medium includes fatty acids, which absorb latent heat through solid-liquid phase change, allowing the battery cell assembly 20 to operate within a suitable temperature range and extending cycle life.

[0151] When there are multiple hollow cavities 47, only some of the hollow cavities 47 may be filled with heat exchange medium, while the others may be left empty; alternatively, all hollow cavities 47 may be filled with heat exchange medium. The heat exchange medium filled in the multiple hollow cavities 47 may be the same or different. For example, the second limiting member 30 has multiple hollow cavities 47, some of which are filled with mica powder, while the others are filled with paraffin wax.

[0152] In some embodiments, both the second limiting member 30 and the first limiting member 40 are provided with hollow cavities 47. Optionally, the heat exchange medium filled in the hollow cavity 47 of the second limiting member 30 and the hollow cavity 47 of the first limiting member 40 are different. For example, the hollow cavity 47 on the second limiting member 30 is filled with ceramic fibers; the hollow cavity 47 on the first limiting member 40 is filled with aerogel. This allows the second limiting member 30 and the first limiting member 40 to form two different thermal management functional barriers between the battery cell assembly 20 and the housing 10, improving the thermal safety of the battery device.

[0153] The battery device provided in this application embodiment improves the thermal safety of the battery device and reduces the risk of safety accidents caused by battery thermal runaway by filling the hollow cavity 47 with a heat exchange medium. The heat exchange medium is used to achieve at least one function among heat insulation, fire prevention, fire extinguishing and phase change thermal management.

[0154] This application provides a battery device, such as... Figures 1 to 3As shown, the device includes a housing 10, a battery cell assembly 20, a second limiting member 30, a first limiting member 40, and a backstop mechanism 50. The housing 10 has a structural beam 11, and the battery cell assembly 20 is installed inside the housing 10. The second limiting member 30 is fixedly connected to the structural beam 11. The first limiting member 40 is located between the second limiting member 30 and the side of the battery cell assembly 20. The second limiting member 30 has a first surface 31, and the first limiting member 40 has a second surface 42 and a third surface 43 that are oppositely arranged. The first surface 31 and the third surface 43 are wedge-shaped inclined surfaces that cooperate with each other. The second surface 42 abuts against the side of the battery cell assembly 20, constraining the displacement of the battery cell assembly 20 along a first direction. The first limiting member 40 has a limiting part 41 located on one side of the first limiting member 40 along a second direction, constraining the displacement of the battery cell assembly 20 in the second direction. The battery cell assembly 20 includes multiple battery cells 21 arranged along a third direction. A limiting portion 41 extends along the third direction to simultaneously limit the multiple battery cells 21 in a second direction. The anti-reverse mechanism 50 includes a third limiting member 51 and a connecting member 52. The third limiting member 51 is movably inserted into the structural beam 11. When the third limiting member 51 is in the extended state, a portion of the third limiting member 51 is located on one side of the first limiting member 40 along the second direction, preventing the first limiting member 40 from sliding outward relative to the second limiting member 30. The connecting member 52 is disposed on the first limiting member 40, and the third limiting member 51 has a connecting hole 511. The connecting member 52 is engaged within the connecting hole 511 to enhance the constraint on the relative position between the structural beam 11 and the first limiting member 40.

[0155] This application provides a battery device, such as... Figures 4 to 6As shown, the device includes a housing 10, a battery cell assembly 20, a second limiting member 30, a first limiting member 40, and a third limiting member 51. The housing 10 has a structural beam 11, and the battery cell assembly 20 is installed inside the housing 10. The second limiting member 30 is fixedly connected to the structural beam 11. The first limiting member 40 is located between the second limiting member 30 and the side of the battery cell assembly 20. The second limiting member 30 has a first surface 31, and the first limiting member 40 has a third surface 43, which are wedge-shaped surfaces that cooperate with each other. Both the second limiting member 30 and the first limiting member 40 have internal cavities 47, which can be filled with a heat exchange medium. The first limiting member 40 also has a second surface 42, which abuts against the side of the battery cell assembly 20, constraining the displacement of the battery cell assembly 20 along a first direction. The first limiting member 40 has a limiting part 41, which is located on one side of the first limiting member 40 along the second direction, constraining the displacement of the battery cell assembly 20 in the second direction. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a third direction, and the limiting part 41 extends along the third direction. The third limiting member 51 is movably inserted into the structural beam 11. When the third limiting member 51 is in the extended state, a portion of the third limiting member 51 is located on one side of the first limiting member 40 along the second direction, preventing the first limiting member 40 from sliding outward. The third limiting member 51 has a limiting groove 515, and the first limiting member 40 has a limiting block 46, which is engaged in the limiting groove 515, improving the stability of the connection between the first limiting member 40 and the structural beam 11.

[0156] This application provides a battery device, such as... Figures 11 to 13 As shown, the device includes a housing 10, a battery cell assembly 20, a second limiting member 30, and a first limiting member 40. The housing 10 has a structural beam 11, and the battery cell assembly 20 is installed inside the housing 10. The second limiting member 30 is fixedly connected to the structural beam 11. The first limiting member 40 is located between the second limiting member 30 and the side of the battery cell assembly 20. The second limiting member 30 has a first surface 31, and the first limiting member 40 has a third surface 43. The first surface 31 and the third surface 43 are corrugated surfaces that cooperate with each other, allowing for elastic deformation to absorb tolerances upon impact. The first limiting member 40 also has a second surface 42, with interlayers 60 provided between the second surface 42 and the side of the battery cell assembly 20, and between the second limiting member 30 and the structural beam 11. The first limiting member 40 has a limiting portion 41 located on one side of the first limiting member 40 along a second direction, constraining the displacement of the battery cell assembly 20 in the second direction. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a third direction, and a limiting part 41 extends along the third direction to simultaneously limit the plurality of battery cells 21.

[0157] This application also provides an electrical device, including a battery device as described in the above embodiments, the battery device being used to provide electrical energy.

[0158] The technical solutions described in this application are applicable to various electrical devices that use battery devices. These electrical devices include, but are not limited to, mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0159] Taking a vehicle as an example, the housing 10 can be part of the vehicle's chassis structure. For instance, a portion of the housing 10 can be at least part of the vehicle's floor, or a portion of the housing 10 can be at least part of the vehicle's crossbeams and longitudinal beams.

[0160] Electrical equipment is subjected to harsh conditions such as long-term vibration, temperature changes, and impacts during use, which places high demands on the reliability and safety of battery devices.

[0161] The electrical equipment provided in this application embodiment uses the battery device as described above. The battery device limits the battery cell assembly 20 in the second direction and locks it in the first direction through the first limiting member 40, without the need for adhesive bonding, which facilitates maintenance.

[0162] 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 in that, include: Box (10) has structural beams (11); A battery cell assembly (20) is disposed within the housing (10); The second limiting member (30) is disposed on the structural beam (11), and the second limiting member (30) has a first surface (31); The first limiting member (40) has a second surface (42) and a third surface (43) disposed opposite to each other. The second surface (42) abuts against the side of the battery cell assembly (20), so that the first limiting member (40) presses against the battery cell assembly (20) along the first direction. The third surface (43) cooperates with the first surface (31) to absorb the assembly tolerance of the housing (10) and the battery cell assembly (20). The first limiting member (40) has a limiting part (41) located on one side of the battery cell assembly (20) along the second direction, for limiting the battery cell assembly (20) in the second direction. The first direction and the second direction are intersecting.

2. The battery device as claimed in claim 1, characterized in that, The battery cell assembly (20) includes a plurality of battery cells (21), which are arranged along a third direction. The limiting part (41) extends along the third direction to limit the plurality of battery cells (21) in a second direction. The first direction, the second direction and the third direction intersect each other and are not coplanar.

3. The battery device as claimed in claim 1, characterized in that, The first surface (31) and the third surface (43) are parallel planes and are inclined relative to the second direction.

4. The battery device as claimed in claim 3, characterized in that, With the direction pointing to the limiting part (41) in the second direction as the positive direction of the second direction, the first surface (31) is inclined to the side away from the battery cell assembly (20) relative to the second direction along the positive direction of the second direction, and the thickness of the portion of the first limiting member (40) between the second limiting member (30) and the battery cell assembly (20) gradually increases along the positive direction of the second direction.

5. The battery device as claimed in claim 1, characterized in that, Both the first surface (31) and the third surface (43) include a protrusion (431) and a recess (432). The protrusion (431) and the recess (432) extend along the second direction and are spaced apart along a direction perpendicular to the second direction. The protrusion (431) in the first surface (31) is inserted into the recess (432) of the third surface (43), and the protrusion (431) in the third surface (43) is inserted into the recess (432) of the first surface (31). The protrusion (431) and the corresponding recess (432) can press against each other and generate elastic deformation to absorb the assembly tolerance between the housing (10) and the battery cell assembly (20).

6. The battery device as claimed in claim 5, characterized in that, Both the first surface (31) and the third surface (43) are wavy surfaces.

7. The battery device as claimed in claim 1, characterized in that, An interlayer (60) is provided between the first limiting member (40) and the side of the battery cell assembly (20) and / or between the second limiting member (30) and the structural beam (11), the interlayer (60) including at least one of a buffer layer, an insulating layer, a heat insulation layer and a flame retardant layer.

8. The battery device according to any one of claims 1 to 7, characterized in that, The second limiting member (30) and the structural beam (11) are an integral structure.

9. The battery device according to any one of claims 1 to 7, characterized in that, The second limiting member (30) is separately disposed from the structural beam (11), and the second limiting member (30) is fixedly connected to the structural beam (11).

10. The battery device as claimed in claim 1, characterized in that, The battery device further includes a backstop mechanism (50) for limiting the first limiting member (40) in the second direction.

11. The battery device as claimed in claim 10, characterized in that, The anti-reverse mechanism (50) includes a third limiting member (51), which is movably inserted into the structural beam (11) along the first direction. When the third limiting member (51) is in an extended state relative to the structural beam (11), a portion of the third limiting member (51) is located on one side of the first limiting member (40) along the second direction, for limiting the first limiting member (40) in the second direction.

12. The battery device as claimed in claim 11, characterized in that, The anti-reverse mechanism (50) further includes a connector (52), and the third limiting member (51) is provided with a connecting hole (511). The connector (52) passes through the connecting hole (511) and is connected to the first limiting member (40) to limit the third limiting member (51) in the first direction when it is in the extended state.

13. The battery device as claimed in claim 11, characterized in that, One of the third limiting member (51) and the first limiting member (40) is provided with a limiting groove (515), and the other is provided with a limiting block (46). The limiting block (46) is fitted into the limiting groove (515) to limit the third limiting member (51) in the first direction when it is in the extended state.

14. The battery device according to any one of claims 11 to 13, characterized in that, The first limiting member (40) is provided with a supporting surface (44) and a limiting surface (45). The supporting surface (44) and the limiting surface (45) are arranged intersectingly. A part of the third limiting member (51) is placed on the supporting surface (44). The limiting surface (45) is used to limit the maximum stroke of the third limiting member (51) from moving out of the structural beam (11).

15. The battery device as claimed in claim 14, characterized in that, The third limiting member (51) has a flange (516) on the side away from the structural beam (11), and the flange (516) abuts against the limiting surface (45).

16. The battery device as claimed in claim 10, characterized in that, The anti-reverse mechanism (50) includes a fourth limiting member (53), which is an elastic clamping head structure and is disposed on the first limiting member (40). The structural beam (11) is provided with a limiting hole, and the fourth limiting member (53) is clamped in the limiting hole.

17. The battery device as claimed in claim 16, characterized in that, The fourth limiting member (53) includes a base (531), an elastic member (532), and a pin (533). The base (531) is fixed to the first limiting member (40). The elastic member (532) is disposed between the base (531) and the pin (533). When the fourth limiting member (53) limits the first limiting member (40) in the second direction, the pin (533) is inserted into the limiting hole.

18. The battery device according to any one of claims 1 to 7, characterized in that, At least one of the second limiting member (30) and the first limiting member (40) has a hollow cavity (47) inside.

19. The battery device as claimed in claim 18, characterized in that, The hollow cavity (47) is filled with a heat exchange medium.

20. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1 to 19, the battery device being used to provide electrical energy.

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