Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment, and relates to the technical field of batteries. The battery device comprises a battery box body, a battery monomer assembly, a limiting assembly and at least one bandage, wherein the battery box body is provided with an accommodating space; the battery monomer assembly is positioned in the accommodating space; the limiting assembly comprises at least one pair of limiting beams, the limiting beams are fiber reinforced composite material beams, and the pair of limiting beams are connected to the two opposite ends of the battery monomer assembly one by one and are connected with the battery box body; the binding band surrounds and binds the battery monomer assembly, so that the battery monomer assembly and the limiting beam form an integral structure. When the battery device is assembled, all the battery monomer assemblies can be integrally assembled to the battery box body, so that the assembly efficiency can be improved; in addition, the fiber reinforced composite material beam has the advantages of light weight, high strength and the like, and is beneficial to improving the energy density and the overall reliability of the battery device.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the assembly efficiency of battery devices is a research direction. Utility Model Content

[0004] This application provides a battery device and an electrical appliance that can improve the assembly efficiency of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including a battery housing, a battery cell assembly, a limiting component, and at least one strap: the battery housing has a receiving space; the battery cell assembly is located within the receiving space; the limiting component includes at least a pair of limiting beams, the limiting beams being fiber-reinforced composite material beams, the pair of limiting beams being connected one-to-one to opposite ends of the battery cell assembly and connected to the battery housing; the strap surrounds and binds the battery cell assembly and the limiting beams, so that the battery cell assembly and the limiting beams form an integral structure.

[0006] By adopting the above technical solution, the battery cell assembly and the limiting beam are integrated using straps. During assembly, all battery cell assemblies can be assembled into the battery housing as a whole. Compared with related technologies that can only assemble battery cells into the housing in batches, this can improve assembly efficiency. In addition, the limiting beam is designed as a fiber-reinforced composite material beam, which has the advantages of being lightweight and having high strength, and helps to improve the energy density and overall reliability of the battery device.

[0007] In some embodiments of this application, the limiting beam includes an outer reinforcing layer and an inner reinforcing layer, the outer reinforcing layer covering the outside of the inner reinforcing layer, the outer reinforcing layer being made of at least one layer of multiaxial fiber fabric; and the inner reinforcing layer being made of at least one layer of unidirectional fiber fabric.

[0008] Using the above technical solution, the outer reinforcing layer of the multiaxial fiber fabric has good impact resistance, and the inner reinforcing layer of the unidirectional fiber fabric has high strength and high modulus in a specific direction. The combination of the two makes the limiting beam have better structural stiffness and resistance to extrusion deformation.

[0009] In some embodiments of this application, the multiaxial fiber fabric is a triaxial fabric or a tetraaxial fabric.

[0010] By adopting the above technical solution, triaxial or quadriaxial fiber fabrics are used as the outer reinforcing layer, which can better resist impact, shear and torsional loads from all directions, and further improve the overall structural stability and local resistance to damage of the limiting beam.

[0011] In some embodiments of this application, the battery housing includes a frame and a plate, the plate covering one side opening of the frame, the frame and the plate forming the receiving space, the limiting beam having a first side facing the battery cell assembly and a second side away from the battery cell assembly, the first side being connected to the battery cell assembly, and at least one of the opposite ends of the second side having a chamfer along the arrangement direction of the battery cell assembly to the plate.

[0012] By adopting the above technical solution, the chamfer can reduce the possibility of stress concentration between the second side and the strap, which could damage the strap.

[0013] In some embodiments of this application, the radius R of the chamfer is greater than or equal to 5 millimeters.

[0014] By adopting the above technical solution, the radius R of the chamfer is greater than or equal to 5 mm, which provides sufficient bending transition space for the strap and further reduces the possibility of strap damage.

[0015] In some embodiments of this application, the size of the limiting beam is equal to the size of the battery cell assembly along the arrangement direction from the battery cell assembly to the plate.

[0016] By adopting the above technical solution, the thickness of the limiting beam is designed to be equal to the thickness of the battery cell assembly, so that there will be no protrusion at the connection between the limiting beam and the battery cell assembly, thereby reducing the possibility of damage to the straps, and allowing the straps to fit more tightly to the battery cell assembly and the limiting beam.

[0017] In some embodiments of this application, the battery box is provided with a limiting part, which is connected to the limiting beam and is used to fix the limiting beam.

[0018] By adopting the above technical solution, the limiting beam is fixed by the limiting part, which is more convenient to connect the limiting beam and the battery box than welding.

[0019] In some embodiments of this application, the two limiting portions are connected one by one to the two ends of the limiting beam along its length to fix the limiting beam.

[0020] By adopting the above technical solution, the two limiting parts limit and fix the two ends of the limiting beam, thereby improving the positional stability of the limiting beam after it is installed in the battery box.

[0021] In some embodiments of this application, the limiting part includes a limiting groove and a limiting block. The limiting groove has an opening for the end to be inserted into. The end is inserted into the limiting groove and forms a gap between it and the inner wall surface of the limiting groove. The limiting block is located within the gap and is used to fix the end.

[0022] By adopting the above technical solution, the two ends can be easily inserted into the two limiting slots respectively, and then the limiting blocks can be installed, which can improve the installation efficiency of the limiting beam.

[0023] In some embodiments of this application, the limiting beam is provided with at least one weight-reducing hole.

[0024] By adopting the above technical solution, the weight reduction hole can reduce the weight of the limiting beam, thereby reducing the weight of the entire battery device and improving the energy density of the battery device.

[0025] In some embodiments of this application, the weight-reducing hole is a strip-shaped hole, and the length direction of the weight-reducing hole is arranged along the length direction of the limiting beam.

[0026] By adopting the above technical solution, the length direction of the weight reduction hole is set along the length direction of the limiting beam, so that the weight reduction hole has a larger size and further improves the weight reduction effect.

[0027] In some embodiments of this application, the strap is a fiber-reinforced composite material strap.

[0028] Using the above technical solution, the fiber-reinforced composite material belt has the advantages of being lightweight, strong, and tough. While meeting the requirements of fixing the battery cell assembly, it can reduce the weight of the battery device and thus improve the energy density of the battery device.

[0029] In some embodiments of this application, the two ends of the strap overlap to form an overlap area, and the length of the overlap area is greater than or equal to 50 mm.

[0030] By adopting the above technical solution, the length of the overlap area is designed to be greater than or equal to 50 mm, so that the overlap area has a larger connection area, the force in the overlap area can be transmitted smoothly, and the possibility of stress concentration in the overlap area is reduced.

[0031] In some embodiments of this application, the strap is bonded to the battery cell assembly, and / or the limiting beam is bonded to the battery cell assembly.

[0032] By adopting the above technical solution, bonding not only facilitates processing, but also enables stable connection of battery cell components to the binding straps and limiting beams respectively.

[0033] In some embodiments of this application, the battery cell assembly includes a plurality of battery cells arranged in an array, the array having multiple rows and columns, and the straps are wrapped around and overlapped on two adjacent columns of battery cells.

[0034] By adopting the above technical solution, a single strap can simultaneously apply a binding force to two adjacent rows of battery cells, thereby improving the binding performance of the battery cell assembly.

[0035] In some embodiments of this application, the battery cell assembly is surrounded by the strap on the outermost side along the arrangement direction of the multiple columns.

[0036] The above technical solution also includes straps on the periphery of the battery cell assembly, which can better constrain the battery cell assembly.

[0037] Secondly, embodiments of this application provide an electrical device including a battery device as described in any of the above technical solutions, wherein the battery device is used to provide electrical energy or store electrical energy. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0039] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0040] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application from one perspective;

[0041] Figure 3 A schematic diagram of the structure of a battery device provided in some embodiments of this application from another perspective;

[0042] Figure 4 for Figure 3 Enlarged view of part A;

[0043] Figure 5 for Figure 3 BB cross-section;

[0044] Figure 6 This is a schematic diagram of the strap structure provided in some embodiments of this application;

[0045] Figure 7 for Figure 6 Enlarged view of part C;

[0046] Figure 8 Side view of the limiting beam provided in some embodiments of this application;

[0047] Figure 9 Cross-sectional views of the limiting beam provided in some embodiments of this application;

[0048] Figure 10 for Figure 9 Enlarged view of part d.

[0049] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0050] 1000, vehicles;

[0051] 100. Battery device;

[0052] 10. Battery housing; 11. Frame; 12. Panel; 13. Accommodation space; 14. Limiting part; 141. Limiting groove; 142. Limiting block;

[0053] 20. Battery cell assembly; 21. Battery cell;

[0054] 30. Limiting component; 31. Limiting beam; 311. First side; 312. Second side; 313. Outer reinforcing layer; 314. Inner reinforcing layer; 315. Chamfer; 316. Weight reduction hole;

[0055] 40. Straps; 41. Overlap area;

[0056] 200. Controller;

[0057] 300. Motor;

[0058] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0061] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] 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, H and / or B can represent: H existing alone, H and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0065] In this application, "multiple" means two or more (including two).

[0066] A battery device typically includes a battery housing and individual battery cells housed within it. To improve structural stability and address potential expansion during charging and discharging, the battery housing is equipped with limiting beams that restrict and constrain the individual battery cells.

[0067] Currently, in the assembly process of battery devices, individual battery cells need to be installed into the battery housing in batches, and limiting beams need to be welded inside the housing. This method is inefficient and has high manufacturing costs.

[0068] Therefore, improving the assembly efficiency of battery devices is an important issue in the research and development of battery devices and related components.

[0069] In view of this, this application provides a technical solution that integrates all the battery cells and limiting beams of the battery cell assembly into one unit by means of strapping, and then directly assembles them into the box to solve the above-mentioned technical problems.

[0070] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0071] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0072] Combined with appendix Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0073] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] Combined with appendix Figure 2-6As shown, this application provides a battery device 100, including a battery housing 10, a battery cell assembly 20, a limiting component 30, and at least one strap 40: the battery housing 10 has a receiving space 13; the battery cell assembly 20 is located in the receiving space 13; the limiting component 30 includes at least a pair of limiting beams 31, the limiting beams 31 are fiber-reinforced composite material beams, the pair of limiting beams 31 are connected one to one at opposite ends of the battery cell assembly 20, and are connected to the battery housing 10; the strap 40 surrounds and binds the battery cell assembly 20 and the limiting beams 31, so that the battery cell assembly 20 and the limiting beams 31 form an integral structure.

[0076] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include a plurality of battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0077] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21; as an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 21 into an independent module. As an example, a battery module can be formed by binding a plurality of battery cells 21 together with cable ties.

[0078] In some embodiments, the battery cell assembly 20 may be a battery module, and the battery cell assembly 20 may be housed in the battery housing 10 by fixing the battery module in the battery housing 10.

[0079] In some embodiments, the battery cell assembly 20 may also be housed in the battery housing 10 by directly fixing a plurality of battery cells 21 to the battery housing 10.

[0080] In some embodiments, the battery housing 10 may include a cover (not shown), a frame 11, and a plate 12. The cover and the plate 12 are respectively connected to the frame 11, so that the interior of the battery housing 10 forms a closed space to accommodate the battery cells 21.

[0081] As an example, the battery housing 10 can be part of the chassis structure of the vehicle 1000. For example, the cover of the battery housing 10 can be at least part of the floor of the vehicle 1000, or the frame 11 of the battery housing 10 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0082] The battery cell 21 in this embodiment can be a lithium-ion secondary battery cell 21, a lithium-ion primary battery cell 21, a lithium-sulfur battery cell 21, a sodium-lithium-ion battery cell 21, a sodium-ion battery cell 21, or a magnesium-ion battery cell 21, etc., and this application embodiment is not limited in this respect. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited in this respect either.

[0083] The battery cell assembly 20, the limiting assembly 30, and the strap 40 are all located within the accommodating space 13. The battery cell assembly 20 includes multiple battery cells 21 arranged in a matrix, and adjacent battery cells 21 can be connected by bonding or other connection methods.

[0084] When there is only one battery cell assembly 20, the battery cell assembly 20 is a collection of all battery cells 21 in the battery device 100. A pair of limiting beams 31 are located at both ends of the battery cell assembly 20 and are connected to the battery cell assembly 20.

[0085] At this time, the strap 40 binds the battery cell assembly 20 and the limiting beam 31, so that all the battery cells 21 and the limiting beam 31 of the battery device 100 form an integrated structure.

[0086] When there are multiple battery cell modules 20, the multiple battery cell modules 20 are interconnected to form an overall module, and a pair of limiting beams 31 are located at both ends of the battery cell module 20 and connected to both ends of the overall module.

[0087] At this point, the straps 40 bind all the battery cell assembly 20 and the limiting beam 31, so that all the battery cells 21 and the limiting beam 31 of the battery device 100 form an integrated structure.

[0088] In this embodiment, when assembling the battery device 100, the battery cell assembly 20 and the limiting beam 31 are first connected by the straps 40 to form an integral module. Then, the integral module is directly assembled into the housing, and the limiting beam 31 and the battery housing 10 are connected.

[0089] The entire process is convenient and quick, enabling all battery cells 21 to be quickly assembled into the housing. Compared with related technologies that can only assemble some battery cells 21 into the housing in batches, this method can improve assembly efficiency and meet the requirements of large-scale and efficient manufacturing of the battery device 100.

[0090] In addition, the limiting beam 31 in this embodiment is a fiber-reinforced composite beam. The fiber-reinforced composite beam is a structural load-bearing component made by using high-performance fibers (such as carbon fiber, glass fiber or aramid fiber) as reinforcing materials and resin matrix (such as epoxy resin) through processes such as pultrusion, winding or molding.

[0091] Fiber-reinforced composite beams have advantages such as lightweight and high strength, which help improve the energy density and overall reliability of battery devices.

[0092] Combined with appendix Figure 8-10 As shown, in some examples, optionally, the limiting beam 31 includes an outer reinforcing layer 313 and an inner reinforcing layer 314, the outer reinforcing layer 313 covering the outside of the inner reinforcing layer 314, the outer reinforcing layer 313 being made of at least one layer of multiaxial fiber fabric; the inner reinforcing layer 314 being made of at least one layer of unidirectional fiber fabric.

[0093] Among them, the "multiaxial" in the multiaxial fiber fabric of the outer reinforcing layer 313 refers to the limiter being interwoven and laid in a preset direction (such as 0°, ±45°, 90°), so that it can simultaneously bear complex loads from different directions (such as impacts, vibrations and torsion from various directions), providing the beam with better impact resistance and tear resistance.

[0094] The "unidirectional" in the unidirectional fiber fabric of the inner reinforcing layer 314 refers to the fact that the fibers in this layer are mainly arranged in a single direction (such as the length direction of a beam). The unidirectional fiber fabric can provide axial tensile strength and stiffness to resist the main tensile loads generated by battery expansion, etc.

[0095] In some embodiments, the fiber direction of the multiaxial fiber fabric includes at least three different directions, and the fiber direction of the unidirectional fiber fabric is arranged along the length direction of the limiting beam 31.

[0096] In the aforementioned limiting beam 31 structure, the outer reinforcing layer 313 of the multiaxial fiber fabric has good impact resistance, and the inner reinforcing layer 314 of the unidirectional fiber fabric has high strength and high modulus in a specific direction. The combination of the two makes the limiting beam 31 have better structural stiffness and resistance to extrusion deformation.

[0097] In some examples, the multiaxial fiber fabric may optionally be a triaxial or tetraaxial fabric.

[0098] Among them, triaxial fabric refers to fibers laid out in three directions: 0°, +45°, and -45°: it can provide strength support in the length direction (0°) and two oblique directions (±45°) of the limiting beam 31.

[0099] Triaxial fabrics improve torsional and shear resistance while ensuring axial load-bearing capacity, effectively coping with complex torsional loads.

[0100] Tetraaxial fabric refers to fabrics with an additional 90° direction fiber on top of 0° and ±45°. The additional 90° fiber (transverse direction) in tetraaxial fabric can significantly improve the transverse stiffness and resistance to lateral impact of the structure, reducing the possibility of cracking or deformation of the limiting beam 31.

[0101] In this embodiment, triaxial or quadriaxial fiber fabric is used as the outer reinforcing layer 313, which can better resist impact, shear and torsional loads from all directions, and further improve the overall structural stability and local resistance to damage of the limiting beam 31.

[0102] In some examples, the battery housing 10 may optionally include a frame 11 and a plate 12, the plate 12 covering one side opening of the frame 11, the frame 11 and the plate 12 enclosing an accommodating space 13, the limiting beam 31 having a first side 311 facing the battery cell assembly 20 and a second side 312 facing away from the battery cell assembly 20, the first side 311 being connected to the battery cell assembly 20, and at least one of the opposite ends of the second side 312 having a chamfer 315 along the arrangement direction of the battery cell assembly 20 to the plate 12.

[0103] At least one of the opposite ends of the second side 312 is provided with a chamfer 315, which may be along the arrangement direction of the battery cell assembly 20 to the plate 12 (the second direction Y in the figure), and one or both ends of the second side 312 are provided with a chamfer 315.

[0104] The chamfer 315 transforms the right-angled edge of the original second side 312 into a curved or arc-shaped surface. In this way, when the strap 40 is connected to the limiting beam 31, the chamfer 315 transforms the sharp corner into a smooth transition, which can significantly disperse stress and reduce the possibility of stress concentration between the second side 312 and the strap 40, resulting in wear or tear of the strap 40.

[0105] In some examples, optionally, the radius R of the chamfer 315 is greater than or equal to 5 mm.

[0106] The radius R of chamfer 315 refers to the radius of the arc when the right angle at the end of the second side 312 of the limiting beam 31 is cut into a circular arc transition.

[0107] The larger the R value, the smoother the arc transition and the better the effect of eliminating stress concentration. Therefore, in this embodiment, the radius R of the chamfer 315 is greater than or equal to 5 mm, providing sufficient bending transition space for the strap 40 and further reducing the possibility of damage to the strap 40.

[0108] In some embodiments, the radius R may be less than or equal to 20 millimeters.

[0109] In some examples, the dimensions of the limiting beam 31 are equal to the dimensions of the battery cell assembly 20 along the arrangement direction of the battery cell assembly 20 to the plate 12.

[0110] The dimension of the limiting beam 31 along the arrangement direction of the battery cell assembly 20 to the plate 12 is its thickness direction or height direction, and the dimension of the battery cell assembly 20 along the arrangement direction of the battery cell assembly 20 to the plate 12 is its thickness direction. Both are the second direction Y in the figure.

[0111] In this structure, the limiting beam 31 and the upper and lower end faces of the battery cell assembly 20 can be flush, and their edges can be close to each other or even on the same plane. There will be no protrusion at the connection between the two, thereby reducing the possibility of the strap 40 being damaged by the edges.

[0112] Furthermore, the absence of protruding edges between the limiting beam 31 and the battery cell assembly 20 allows the strap 40 to be completely attached to the battery cell assembly 20 and the limiting beam 31.

[0113] Combined with appendix Figure 3 and 4 As shown, in some embodiments of this application, the battery box 10 is provided with a limiting part 14, which is connected to the limiting beam 31 and is used to fix the limiting beam 31.

[0114] The limiting part 14 refers to a structure that can limit the displacement of the limiting beam 31 by being opened or installed on the battery box 10.

[0115] The connection between the limiting part 14 and the limiting beam 31 can be a snap-fit, interference fit, plug-in, or other separate connection methods.

[0116] Compared to integrated connection methods such as welding, using the limiting part 14 to fix the limiting beam 31 makes it easier to connect the limiting beam 31 to the battery box 10 compared to welding.

[0117] In some examples, optionally, the two limiting parts 14 are connected one by one to the two ends of the limiting beam 31 along its length to fix the limiting beam 31.

[0118] By connecting the two limiting parts 14 to the two ends of the limiting beam 31 one by one, the limiting beam 31 can be better limited and fixed, thereby improving the positional stability of the limiting beam 31 after it is installed in the battery box 10.

[0119] Of course, there can be only one limiting part 14. A single limiting part 14 located on the base plate can also serve as a limiting part.

[0120] In some examples, the limiting part 14 may optionally include a limiting groove 141 and a limiting block 142. The limiting groove 141 has an opening for the insertion of the limiting beam 31. The end is inserted into the limiting groove 141 through the opening and forms a gap between the end and the inner wall surface of the limiting groove 141. The limiting block 142 is located within the gap and is used to fix the end.

[0121] Taking the limiting groove 141 provided on the frame 11 as an example, the limiting groove 141 has through openings on the side away from the bottom plate 12 and on the side facing the limiting beam 31. Specifically, the openings include a first opening of the limiting groove 141 facing the end side along the first direction X, and an opening of the limiting groove 141 on the side away from the plate 12 along the second direction Y.

[0122] Since the size of the limiting groove 141 is larger than the end of the limiting beam 31, the two ends of the limiting beam 31 can be easily inserted directly into the two limiting grooves 141.

[0123] Then, the limiting block 142 is inserted into the gap between the inner wall of the limiting groove 141 and the limiting beam 31 to fix the limiting beam 31.

[0124] This method can improve the installation efficiency of the limiting beam 31, and the interference fit between the limiting block 142 and the limiting groove 141 and the limiting beam 31 when the limiting block 142 is inserted into the limiting groove 141 can better constrain the limiting beam 31.

[0125] Of course, the structure of the limiting part 14 in this embodiment is not limited to this. For example, the limiting part 14 can be a slot directly opened on the frame 11, or a limiting member installed on the frame 11.

[0126] Combined again with the appendix Figure 8 and 9 As shown, in some examples, the limiting beam 31 is optionally provided with at least one weight-reducing hole 316.

[0127] The weight reduction hole 316 can penetrate through the limiting beam 31, or it can be hidden inside the limiting beam 31.

[0128] By opening the weight reduction hole 316, the weight of the limiting beam 31 can be reduced, thereby reducing the weight of the entire battery device 100 and increasing the energy density of the battery device 100.

[0129] In some examples, the length direction of the weight reduction hole 316 is optionally set along the length direction of the limiting beam 31.

[0130] The weight reduction hole 316 is set along the length of the limiting beam 31, so that the weight reduction hole 316 has a larger size and improves the weight reduction effect.

[0131] In some embodiments, the number of weight-reducing holes 316 is multiple, and all the multiple weight-reducing holes 316 penetrate the end faces of both ends of the limiting beam 31 along its length. This not only facilitates processing but also further enhances the weight-reduction effect.

[0132] In some examples, the strap 40 is optionally a fiber-reinforced composite strip.

[0133] Fiber-reinforced composite tape refers to a strip-shaped component made by using high-strength continuous fibers (such as carbon fiber, aramid fiber, glass fiber, and ultra-high molecular weight polyethylene fiber) as reinforcing fibers and polymer resins (such as epoxy resin, polyurethane, unsaturated resin, phenolic resin, and rubber) as the matrix, through processes such as pultrusion, weaving, impregnation, or prepreg curing.

[0134] The reinforcing fiber can be a continuous unidirectional fiber (along the length direction), a long fiber, a short fiber, or a plain weave, twill weave, or satin weave fabric woven from the fiber, or an axial fabric.

[0135] Fiber-reinforced composite material belts have the advantages of being lightweight, strong, and tough. While fixing the battery cell assembly 20, they can reduce the weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0136] like Figure 6 and 7 As shown, in some examples, optionally, the two ends of the strap 40 overlap to form an overlap area 41, the length of which is greater than or equal to 50 mm.

[0137] The strap 40 can be a single strip of strap, and the two ends of the strap 40 can be glued together or connected by other mechanical connection methods (such as buckles).

[0138] The strap 40 can be wrapped around the battery cell assembly 20 to secure the battery cell assembly 20 and the limiting beam 31.

[0139] The length of the overlap area 41 is designed to be greater than or equal to 50 mm, so that the overlap area 41 has a larger connection area, the force of the overlap area 41 can be transmitted smoothly, and the possibility of stress concentration in the overlap area 41 is reduced.

[0140] Of course, in some embodiments, the strap 40 can also be wrapped around the battery cell assembly more than 20 times (this embodiment is not shown in the figure). Multiple wraps of strap 40 improve the stability and safety of the overall constraint.

[0141] In some embodiments, the strap 40 may not be a single strip, but rather composed of at least two sub-strips joined end to end, with the ends of adjacent sub-strips overlapping and fitting together in the winding direction (this embodiment is not shown in the figure).

[0142] In some examples, optionally, the strap 40 is bonded to the battery cell assembly 20, and / or the limiting beam 31 is bonded to the battery cell assembly 20.

[0143] The strap 40 is bonded to the battery cell assembly 20. Taking the strap 40 as the fiber-reinforced composite material tape mentioned above as an example, an adhesive layer (such as pressure-sensitive adhesive) can be applied to the strap 40. In this case, the strap 40 is a fiber tape.

[0144] During the process of wrapping the strap 40 to the battery cell assembly 20, the adhesive layer directly connects the strap 40 to the battery cell assembly 20, making installation convenient.

[0145] Similarly, an adhesive layer can also be applied to the limiting beam 31, which can be used to achieve a stable connection between the battery cell assembly 20 and the limiting beam 31.

[0146] Combined again with the appendix Figure 2 and 3 As shown, in some examples, optionally, the battery cell assembly 20 includes a plurality of battery cells 21 arranged in an array, the array having multiple rows and columns, with straps 40 wrapped around and overlapping adjacent rows of battery cells 21.

[0147] A row of battery cells 21 refers to multiple battery cells 21 arranged sequentially along the third direction Z in the figure, and a line of battery cells 21 refers to multiple battery cells 21 arranged sequentially along the first direction X in the figure.

[0148] The third direction Z intersects the first direction X and the second direction Y mentioned above. The third direction Z is the thickness direction of the battery cell 21. In some embodiments, the third direction Z is also the length direction of the battery housing 10.

[0149] The strap 40 in the figure is wrapped around and overlapped on the two adjacent rows of battery cells 21. Of course, the strap 40 can also be wrapped around and overlapped on the two adjacent rows of battery cells 21 (this embodiment is not shown in the figure).

[0150] Alternatively, the strap 40 can be designed to wrap around and overlap with two adjacent rows of battery cells 21, and also wrap around and overlap with two adjacent columns of battery cells 21, forming a cross-shaped binding (this implementation is not shown in the figure).

[0151] This structure allows a strap 40 to apply a binding force to two adjacent rows or columns of battery cells 21 simultaneously, improving the binding performance of the battery cell assembly 20.

[0152] In some examples, optionally, the outermost edge of the battery cell assembly 20 along the multi-column arrangement direction is surrounded by a strap 40.

[0153] Taking the four rows of battery cells 21 in the figure as an example, in addition to the straps 40 wrapped between adjacent rows of battery cells 21, the outer edges of the two outermost rows of battery cells 21 are also wrapped with straps 40. At this time, the number of straps 40 is five, that is, the number of straps 40 is the number of rows of battery cells 21 plus one.

[0154] The battery cell module 20 is also equipped with straps 40 on its outer periphery, which can better constrain the battery cell module 20.

[0155] Secondly, embodiments of this application provide an electrical device including a battery device 100 according to any of the above technical solutions, wherein the battery device 100 is used to provide electrical energy.

[0156] Combined again with the appendix Figure 1 As shown, based on the battery device 100 described above, this application embodiment also provides an electrical device, including the battery device 100 described above. The battery device 100 is used to provide electrical energy to the electrical device or store electrical energy. The electrical device may be a vehicle 1000.

[0157] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below.

[0158] Finally, please see the appendix. Figure 2-10As shown, this application embodiment provides a battery device 100, including a battery housing 10, a battery cell assembly 20, a limiting component 30, and at least one strap 40. The battery housing 10 has a receiving space 13; the battery cell assembly 20 is located within the receiving space 13; the limiting component 30 includes at least a pair of limiting beams 31, the limiting beams 31 being fiber-reinforced composite material beams, the pair of limiting beams 31 being connected one-to-one to opposite ends of the battery cell assembly 20 and connected to the battery housing 10; the strap 40 surrounds and binds the battery cell assembly 20 and the limiting beams 31, so that the battery cell assembly 20 and the limiting beams 31 form an integral structure. The limiting beam 31 includes an outer reinforcing layer 313 and an inner reinforcing layer 314, the outer reinforcing layer 313 covering the outside of the inner reinforcing layer 314, the outer reinforcing layer 313 being made of at least one layer of multiaxial fiber fabric; the inner reinforcing layer 314 being made of at least one layer of uniaxial fiber fabric. The multiaxial fiber fabric is a triaxial fabric or a tetraaxial fabric. The battery housing 10 includes a frame 11 and a plate 12. The plate 12 covers one opening of the frame 11, and the frame 11 and the plate 12 enclose an accommodating space 13. The limiting beam 31 has a first side 311 facing the battery cell assembly 20 and a second side 312 facing away from the battery cell assembly 20. The first side 311 is connected to the battery cell assembly 20. Along the arrangement direction of the battery cell assembly 20 to the plate 12, at least one end of the opposite ends of the second side 312 is provided with a chamfer 315. The radius R of the chamfer 315 is greater than or equal to 5 mm. Along the arrangement direction of the battery cell assembly 20 to the plate 12, the size of the limiting beam 31 is equal to the size of the battery cell assembly 20. The battery housing 10 is provided with a limiting part 14, which is connected to the limiting beam 31 and is used to fix the limiting beam 31. The battery housing 10 includes a frame 11 and a plate 12. The plate 12 covers one opening of the frame 11, and the frame 11 and the plate 12 enclose a receiving space 13. Two limiting parts 14 are connected to the two ends of the limiting beam 31 to fix the limiting beam 31. The limiting part 14 includes a limiting groove 141 and a limiting block 142. The limiting groove 141 has an opening for the insertion of the limiting beam 31. The end is inserted into the limiting groove 141 through the opening and forms a gap between it and the inner wall of the limiting groove 141. The limiting block 142 is located within the gap and is used to fix the end. The limiting beam 31 is provided with at least one weight-reducing hole 316. The weight-reducing hole 316 is a strip-shaped hole, and its length direction is along the length direction of the limiting beam 31. The strap 40 is a fiber-reinforced composite material strap. The two ends of the strap 40 overlap to form an overlap area 41, and the length of the overlap area 41 is greater than or equal to 50 mm. The strap 40 is bonded to the battery cell assembly 20, and / or the limiting beam 31 is bonded to the battery cell assembly 20. The battery cell assembly 20 includes a plurality of battery cells 21 arranged in an array, the array having multiple rows and columns, and the strap 40 is wrapped around and overlapped on adjacent rows of battery cells 21. The strap 40 is wrapped around the outermost part of the battery cell assembly 20 along the arrangement direction of the multiple columns.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for the intermediate technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery device, characterized in that, include: The battery housing has storage space; The battery cell assembly is located within the accommodating space; A limiting component, disposed in the receiving space, includes at least one pair of limiting beams, the limiting beams being fiber-reinforced composite material beams, the pair of limiting beams being connected one to each of the opposite ends of the battery cell assembly and connected to the battery housing; and At least one strap surrounds and binds the battery cell assembly and the limiting beam to form an integral structure.

2. The battery device according to claim 1, characterized in that, The limiting beam includes an outer reinforcing layer and an inner reinforcing layer. The outer reinforcing layer covers the outside of the inner reinforcing layer. The outer reinforcing layer is made of at least one layer of multiaxial fiber fabric. The inner reinforcing layer is made of at least one layer of unidirectional fiber fabric.

3. The battery device according to claim 2, characterized in that, The multiaxial fiber fabric is a triaxial fabric or a tetraaxial fabric.

4. The battery device according to claim 1, characterized in that, The battery housing includes a frame and a plate. The plate covers one side opening of the frame. The frame and the plate enclose the receiving space. The limiting beam has a first side facing the battery cell assembly and a second side away from the battery cell assembly. The first side is connected to the battery cell assembly. Along the arrangement direction of the battery cell assembly to the plate, at least one of the opposite ends of the second side is provided with a chamfer.

5. The battery device according to claim 4, characterized in that, The radius R of the chamfer is greater than or equal to 5 mm.

6. The battery device according to claim 4, characterized in that, Along the arrangement direction of the battery cell assembly to the plate, the size of the limiting beam is equal to the size of the battery cell assembly.

7. The battery device according to claim 1, characterized in that, The battery box is provided with a limiting part, which is used to fix the limiting beam.

8. The battery device according to claim 7, characterized in that, The two limiting parts are connected to the two ends of the limiting beam along its length to fix the limiting beam.

9. The battery device according to claim 8, characterized in that, The limiting part includes a limiting groove and a limiting block. The limiting groove has an opening for the end to be inserted. The end is inserted into the limiting groove and forms a gap between it and the inner wall surface of the limiting groove. The limiting block is located within the gap and is used to fix the end.

10. The battery device according to claim 1, characterized in that, The limiting beam is provided with at least one weight-reducing hole.

11. The battery device according to claim 10, characterized in that, The weight-reducing hole is a strip-shaped hole, and its length direction is set along the length direction of the limiting beam.

12. The battery device according to any one of claims 1-11, characterized in that, The strap is a fiber-reinforced composite material strap.

13. The battery device according to any one of claims 1-11, characterized in that, The two ends of the strap overlap to form an overlap area, and the length of the overlap area is greater than or equal to 50 mm.

14. The battery device according to any one of claims 1-11, characterized in that, The strap is bonded to the battery cell assembly, and / or the limiting beam is bonded to the battery cell assembly.

15. The battery device according to any one of claims 1-11, characterized in that, The battery cell assembly includes multiple battery cells arranged in an array, the array having multiple rows and columns, and the straps are wrapped around and overlapped on two adjacent columns of battery cells.

16. The battery device according to claim 15, characterized in that, The battery cell assembly is surrounded by the straps on the outermost side along the arrangement direction of the multiple columns.

17. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-16, the battery device being used to provide electrical energy or store electrical energy.

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