Battery devices and electrical equipment

Abstract

This application discloses a battery device and an electrical appliance. The battery device includes a housing, a strapping assembly, and individual battery cells. The housing has a receiving portion. The strapping assembly includes multiple straps that are wrapped around the outer periphery of the housing and arranged around the housing. The individual battery cells are disposed in the receiving portion. The battery device provided in this application can improve pressure resistance and reliability.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] The development of battery technology must take into account multiple design factors. For example, how to further improve the reliability of individual battery cells is an important research direction in the battery field. Utility Model Content

[0004] This application provides a battery device and a battery processing equipment for electrical appliances, which can improve the pressure resistance and reliability.

[0005] In a first aspect, this application provides a battery device, including a housing, a strapping assembly, and a battery cell. The housing includes a first housing portion and a second housing portion that are detachably connected. The first housing portion and the second housing portion are interlocked and enclosed along a first direction to form a receiving portion. The strapping assembly includes a plurality of straps that are wrapped around the outer periphery of the housing and arranged around the housing. The battery cell is disposed in the receiving portion.

[0006] In the technical solution of this application embodiment, the battery device includes a housing, battery cells disposed in the housing, and a binding assembly wrapped around the housing. The binding assembly includes multiple binding straps, which are arranged around the housing and can provide binding and tightening forces to the housing. Thus, the binding assembly can effectively improve the pressure resistance of the housing, suppress buckling and rupture of the housing due to internal high pressure under extreme conditions such as thermal runaway, and improve the reliability of the battery device.

[0007] According to some embodiments of this application, the strapping is looped, and multiple strappings include a first strapping and a second strapping. The circumferential axis of the first strapping is parallel to a second direction, and the circumferential axis of the second strapping is parallel to a third direction. The first direction, the second direction, and the third direction intersect each other in pairs. At least some of the first and second strappings intersect each other and are partially stacked along the first direction. This ensures that the strapping assembly includes at least two types of strapping that intersect axially, and each strapping simultaneously wraps around two parts of the box, further improving the reinforcement effect on the box.

[0008] According to some embodiments of this application, multiple first straps are arranged along a second direction, and the spacing between adjacent first straps first decreases and then increases along the second direction; and / or, multiple second straps are arranged along a third direction, and the spacing between adjacent second straps first decreases and then increases along the third direction. The number of straps is specifically increased in the central region with larger deformation to further improve pressure resistance.

[0009] According to some embodiments of this application, the strapping band satisfies at least one of the following conditions: (1) the strapping band includes multiple stacked sub-layers, and the thickness of the strapping band is 2mm-8mm; (2) the tensile strength of the strapping band is greater than or equal to 3500MPa; (3) the elastic modulus of the strapping band is greater than or equal to 230GPa. This gives the strapping band high structural strength, meeting the reinforcement requirements of the box.

[0010] According to some embodiments of this application, the housing includes a top wall and a bottom wall disposed opposite to each other along a first direction, with a transition side wall connecting the top wall and the bottom wall; the transition side wall is arc-shaped and protrudes in a direction away from the battery cell. Setting the housing in an eggshell shape improves the housing's pressure resistance and further enhances the overall reliability of the battery device.

[0011] According to some embodiments of this application, the transition sidewall includes a first sub-wall and a second sub-wall arranged along a first direction, the first housing portion includes a connected top wall and a first sub-wall, and the second housing portion includes a connected bottom wall and a second sub-wall. This facilitates the connection of the housing and the maintenance of the internal battery cells.

[0012] According to some embodiments of this application, the thickness of the enclosure is 1.5mm-4mm, and the thickness of at least a portion of the top and bottom walls is greater than the thickness of the transition sidewalls. By adopting an eggshell structure, the enclosure thickness can be reduced, and targeted thickening can further improve the reliability of the enclosure.

[0013] According to some embodiments of this application, the ratio of the dimension of the housing in the second direction to the dimension of the housing in the third direction is 1.3-2, and the first direction, second direction, and third direction intersect each other; along the second direction, the ratio of the dimension of the transition sidewall located on one side of the bottom wall to the dimension of the bottom wall is 0.4-0.6. This improves the proportions of the housing structure and further enhances its pressure resistance.

[0014] According to some embodiments of this application, the transition sidewall is an arc surface, the central angle corresponding to the transition sidewall is 150°-210°, and the radius of curvature of the transition sidewall is 50mm-300mm. Limiting the shape of the enclosure further improves its pressure resistance.

[0015] According to some embodiments of this application, the thickness of the strapping tape is 5mm-8mm. For thinner egg-shaped boxes, a multi-layer winding method is used to form a strapping tape with greater thickness, ensuring the overall reliability of the battery device.

[0016] According to some embodiments of this application, the enclosure includes an inner support layer, an outer support layer, and a support frame connected between the inner and outer support layers, all spaced apart along its thickness. The support frame has multiple perforations. By providing a perforated frame structure in the middle layer, the weight of the enclosure is reduced, and the heat conduction efficiency of the enclosure is decreased.

[0017] According to some embodiments of this application, the enclosure is equipped with a pressure relief component, which is located in an area of ​​the enclosure not covered by the strapping components. This reduces the possibility that the strapping components may interfere with the operation of the pressure relief component.

[0018] According to some embodiments of this application, the strapping includes a fiber braided layer and a covering layer, with the fiber braided layer embedded within the covering layer. The strapping is processed using a casting molding process, making it easy to shape and giving it good conformability and structural strength.

[0019] According to some embodiments of this application, at least one of the surfaces of the housing facing the battery cell and the surface facing away from the battery cell is provided with a heat insulation layer. This blocks heat transfer and further improves the reliability of the housing.

[0020] According to some embodiments of this application, the thickness of the insulation layer is 5mm-15mm. This balances the insulation performance with the volume and weight of the enclosure.

[0021] Secondly, according to the embodiments of this application, an electrical device is provided, including the battery device in any embodiment of the first aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of this application;

[0024] Figure 2 This is a partial explosion diagram of a battery device provided in some embodiments of this application;

[0025] Figure 3This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a battery device provided in some other embodiments of this application.

[0027] Figure label:

[0028] 1000 - Vehicles;

[0029] 100 - Battery device; 200 - Controller; 300 - Motor;

[0030] 10 - Box housing; 20 - Bundling assembly; 30 - Individual battery cell;

[0031] 11-First box section; 12-Second box section; 13-Receiving section; 14-Top wall; 15-Bottom wall; 16-Transition side wall; 21-Binding strap;

[0032] 161 - First sub-wall; 162 - Second sub-wall; 211 - First binding strap; 212 - Second binding strap;

[0033] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0043] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0044] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0045] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0046] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0047] As an example, the positive current collector can be a metal foil or a composite current collector.

[0048] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0049] As an example, the negative electrode current collector can be made of metal foil, foam metal, or composite current collector.

[0050] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0051] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0052] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0053] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0054] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0055] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0056] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0057] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0058] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0059] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0060] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0061] In some embodiments, the housing may be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy into the battery cell.

[0062] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0063] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0064] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0066] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0067] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0068] With the rapid development of new energy vehicles and the energy storage industry, the energy density of battery devices is constantly increasing, and users and the market are also placing higher demands on the safety performance of battery devices. Battery devices typically consist of a housing and multiple individual battery cells housed within it. When a battery cell experiences extreme conditions such as thermal runaway, a large amount of high-temperature, high-pressure gas is generated inside, causing a sharp increase in pressure within the housing. If the housing cannot withstand this pressure, it will buckle, deform, or even rupture, causing high-temperature gas and electrolyte to be ejected, potentially leading to serious safety accidents such as fires and explosions, threatening personal safety and property.

[0069] Based on this, the applicant discovered that existing technologies for improving the pressure resistance of the enclosure mainly employ methods such as adding a layer of heat-insulating material to the enclosure wall, increasing the wall thickness, setting reinforcing ribs inside the enclosure, or using high-strength materials. However, increasing the wall thickness significantly increases the weight of the battery device and reduces energy density; internal reinforcing ribs occupy the internal space of the enclosure, affecting the arrangement and heat dissipation of battery cells; and relying solely on improving material strength faces problems such as high cost and difficult processing. In addition, traditional reinforcement methods often suffer from uneven stress distribution, and there is still a risk of failure in areas of localized stress concentration.

[0070] In view of this, the present application provides a technical solution that strengthens the battery housing by setting straps on the outside of the housing, which can effectively improve the pressure resistance of the housing without significantly increasing the weight and volume, suppress buckling and cracking of the housing under thermal runaway conditions, and improve the reliability of the battery device.

[0071] The technical solutions described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment includes, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0072] The battery cells and battery devices described in this application are not limited to the electrical equipment described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0073] Please see Figure 1 , Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of this application.

[0074] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside vehicle 1000, specifically, for example, at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200, for example, controls the battery's power supply to the motor 300. The battery device 100 can be used for starting, navigation, etc., of vehicle 1000. Of course, the battery can also be used to drive vehicle 1000, replacing or partially replacing gasoline or natural gas as the driving force for vehicle 1000.

[0075] Figure 2 This is an exploded schematic diagram of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 100 includes a housing 10 and a battery cell 30, with the battery cell 30 housed within the housing 10.

[0076] The housing 10 is used to accommodate the battery cell 30, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing portion 11 and a second housing portion 12, which overlap each other, and together define a receiving portion 13 for accommodating the battery cell 30. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with the receiving portion 13; alternatively, both the first housing portion 11 and the second housing portion 12 may be hollow structures with one side open, with the open side of the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with the receiving portion 13. Of course, the first housing portion 11 and the second housing portion 12 can have various shapes, such as cylinders, cuboids, etc.

[0077] In a battery, there can be one or more individual battery cells 30. If there are multiple individual battery cells 30, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple individual battery cells 30 are connected in both series and parallel configurations. Multiple individual battery cells 30 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple individual battery cells 30 is housed within the housing 10. Alternatively, multiple individual battery cells 30 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0078] In some embodiments, there are multiple battery cells 30, which are first connected in series, parallel, or mixed to form a battery module. The multiple battery modules are then connected in series, parallel, or mixed to form a whole and housed in the housing 10.

[0079] Next, we will combine the appendix Figure 3 Appendix Figure 4 Describe the structure of the battery device and the electrical equipment.

[0080] Please refer to the following: Figure 2 and Figure 3 , Figure 2 This is a partial explosion diagram of a battery device provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0081] In a first aspect, this application provides a battery device 100, including a housing 10, a strapping assembly 20, and a battery cell 30. The housing 10 includes a first housing portion 11 and a second housing portion 12 that are detachably connected. The first housing portion 11 and the second housing portion 12 are interlocked and enclosed along a first direction X to form a receiving portion 13. The strapping assembly 20 includes a plurality of strapping straps 21 that are wrapped around the outer periphery of the housing 10 and arranged around the housing 10. The battery cell 30 is disposed in the receiving portion 13.

[0082] This application provides a battery device 100, which includes a housing 10 for providing containment and protection, battery cells 30 disposed within the housing 10 for providing electrical functions, and a strapping assembly 20 wound around the housing 10 for reinforcing the housing 10. The housing 10 may include a first housing portion 11 and a second housing portion 12, which are detachably connected along a first direction X, optionally via a snap-fit ​​connection or a fastener connection, to facilitate the installation and maintenance of the battery cells 30. Multiple battery cells 30 are disposed within a receiving portion 13 enclosed by the housing 10, and the battery cells 30 may be connected in series, parallel, or a combination thereof.

[0083] The strapping assembly 20 includes multiple straps 21, which are wrapped around the outer periphery of the housing 10. Each strap 21 can wrap around the housing 10 one or more times and is used to apply a radially tightening binding force to the housing 10 to reinforce the housing 10 and effectively suppress buckling and rupture of the housing under high pressure. Optionally, the multiple straps 21 can all extend parallel to each other, or at least some of the straps 21 can extend in different directions and intersect with each other, so that the intersecting straps 21 form a cross region stacked along the first direction X.

[0084] Optionally, the strapping 21 in this embodiment has a certain structural strength, and it can be wrapped around the box 10 and at least partially conform to the shape of the outer peripheral surface of the box 10. The strapping 21 is tensioned in the circumferential direction of the box 10 so that it can continuously apply a binding force to the box 10.

[0085] Optionally, in this embodiment, the strapping 21 can be wrapped around the box 10 one or more times, that is, the strapping 21 can be wrapped around one time and connected end to end to form a loop. In this case, the length of the inner surface of the strapping 21 can be the same as or similar to the circumference of the outer circumference of the box 10 at that location. Alternatively, the strapping 21 can be spirally wound around the box 10, wound multiple times along a spring-shaped trajectory. In this case, the strapping 21 can still be fixed by connecting end to end. Alternatively, the two ends of the strapping 21 can be connected to a fixing structure on the box 10. This application does not make specific limitations on this, as long as the strapping 21 can be tensioned and the force can be stable.

[0086] The strapping 21 in this embodiment can be made of materials such as metal strapping, fiber-reinforced composite material strapping, or high-strength polymer strapping. For example, in an embodiment where the box 10 is rectangular, the strapping 21 can be wound along its width or length to facilitate fastening and positioning.

[0087] By wrapping the strapping assembly 20 around the outer periphery of the housing 10, a continuous radial tightening force can be applied to the housing 10, forming a reliable radial restraint effect. When the internal pressure of the housing 10 increases, the tension of the strapping 21 can effectively resist the tendency of the housing 10 to expand outward, inhibit the buckling deformation of the housing 10, delay or prevent the housing 10 from rupturing, thereby improving the structural integrity and reliability of the battery device 100 under extreme conditions such as thermal runaway.

[0088] Furthermore, by wrapping the outer perimeter of the housing 10 with strapping 21, the extra weight generated by installing explosion-proof plates on the walls of the housing 10 or using thicker and heavier explosion-proof plates to manufacture the housing 10 can be eliminated, thereby providing effective reinforcement without significantly increasing the weight of the housing 10 itself, which is conducive to maintaining the high energy density characteristics of the battery device 100.

[0089] Meanwhile, the bundling assembly 20 can flexibly adjust the number, arrangement and winding angle of the bundling straps 21 according to the specific shape and size of the box 10, so as to adapt to battery devices 100 of different specifications and shapes, and has good versatility and scalability.

[0090] In some optional embodiments, the strapping 21 is looped, and the multiple strapping 21 includes a first strapping 211 and a second strapping 212. The circumferential axis of the first strapping 211 is parallel to the second direction Y, and the circumferential axis of the second strapping is parallel to the third direction Z. The first direction X, the second direction Y, and the third direction Z are arranged to intersect each other. At least a portion of the first strapping 211 and the second strapping 212 intersect each other and are partially stacked on top of each other along the first direction X.

[0091] Optionally, the strapping 21 in this embodiment can be in the form of a loop, that is, its ends are connected to each other. It can also be in the form of a single loop formed by wrapping around once, so as to facilitate installation and make the binding force more stable and reliable.

[0092] Based on this, the multiple straps 21 can be divided into two categories, namely, the first strap 211 and the second strap 212, which extend in different directions. Specifically, the axial direction of the first strap 211 is parallel to the second direction Y, and the axial direction of the second strap 212 is parallel to the third direction Z. The first direction X and the second direction Y are intersected by the third direction Z in pairs, and can be further selected to be perpendicular to each other in pairs.

[0093] For example, in embodiments where the box 10 is cuboid or nearly cuboid in shape, one of the second direction Y and the third direction Z can be the length direction and the other is the width direction, and the first direction X can be the height direction. Alternatively, the second direction Y and the third direction Z can both have a certain angle with the length direction and the width direction, so that they are tied at an angle.

[0094] Thus, the first and second strapping straps intersect each other, reinforcing the housing 10 from different directions. Simultaneously, both types of intersecting strapping straps 21 can simultaneously encircle both the first housing section 11 and the second housing section 12, thereby improving the overall pressure resistance of the housing 10 while reinforcing the connection between the two parts of the housing 10, further enhancing the reliability of the battery device 100.

[0095] By configuring the binding assembly 20 to include two types of intersecting binding straps, a spatially intersecting constraint network can be formed. This intersecting arrangement allows the constraint force to be evenly distributed in multiple directions, reducing the possibility of stress concentration due to binding reinforcement. Furthermore, each binding strap 21 is a closed loop structure, which can effectively improve structural stability and reinforcement reliability. At the same time, the intersecting binding straps reinforce each other, reducing the possibility of the binding assembly 20 loosening or shifting under long-term use or vibration conditions.

[0096] In some optional embodiments, a plurality of first straps 211 are arranged along a second direction Y, and the spacing between adjacent first straps 211 tends to increase first and then decrease along the second direction Y; and / or, a plurality of second straps 212 are arranged along a third direction Z, and the spacing between adjacent second straps 212 tends to increase first and then decrease along the third direction Z.

[0097] Optionally, in embodiments where the strapping assembly 20 includes two types of intersecting strapping bands 21, a plurality of first strapping bands 211 are arranged at intervals along their own axial direction, i.e., the second direction Y, and a plurality of second strapping bands 212 are arranged at intervals along their own axial direction, i.e., the third direction Z. Based on this, along the arrangement direction of the two types of strapping bands 21, the spacing between adjacent first strapping bands 211 and the spacing between adjacent second strapping bands 212 can both exhibit a trend of first decreasing and then increasing, that is, both types of strapping bands 21 are arranged with a higher distribution density in the middle and a lower distribution density at the edges.

[0098] For example, if the housing 10 is divided along the second direction Y into a first central region and two first edge regions located on opposite sides of the first central region, then the distribution density of the first strapping straps in the first central region is greater than the distribution density in the first edge regions. Here, distribution density can refer to the ratio of the sum of the widths of the first strapping straps 211 in a certain region along the second direction Y to the width of that region. In embodiments where the widths of the first strapping straps are the same, the distribution density can also be the ratio of the number of first strapping straps 211 in a certain region to the dimension of that region along the second direction Y. Thus, in the central region of the housing 10, the number of first strapping straps 211 is greater and the spacing is smaller; while in the regions near the two ends, the number of first strapping straps 211 is less and the spacing is larger.

[0099] The distribution of the second strapping 212 is similar to that of the first strapping 211, and will not be described again here.

[0100] When extreme situations such as thermal runaway occur in the internal battery cell 30, causing the housing 10 to be subjected to internal pressure, the central area of ​​the housing 10 often experiences greater deflection and deformation due to its distance from the edges and constraints, making it a weak area prone to buckling failure.

[0101] Therefore, by performing the aforementioned non-uniform optimization on the distribution density of the strapping 21, targeted reinforcement of weak areas can be achieved. Appropriately reducing the number of strapping 21 in edge areas with smaller deformation reduces cost and energy consumption. Simultaneously, matching the deformation capacity of the box 10 in different areas with the constraint capacity of the strapping 21 facilitates a smooth stress transition on the box 10 and reduces the possibility of new stress concentrations caused by abrupt constraint changes.

[0102] In some alternative embodiments, the strapping 21 satisfies at least one of the following conditions: (1) the thickness of the strapping 21 is 2 mm to 8 mm; (2) the tensile strength of the strapping 21 is greater than or equal to 3500 MPa; (3) the elastic modulus of the strapping 21 is greater than or equal to 230 GPa.

[0103] Optionally, for the strapping tape in this embodiment, the thickness of the same strapping tape can be the same at all points to ensure uniform strength. The specific thickness of the strapping tape can be 2mm-8mm, for example, any one of 2mm, 4mm, 6mm, and 8mm or somewhere in between. By limiting the thickness of the strapping tape 21, the structural strength and space occupied by the strapping tape 21 can be balanced, reducing the possibility that the strapping assembly 20 will cause the overall volume / weight of the battery device 100 to be too large while ensuring good reliability.

[0104] It is understood that the aforementioned thickness range refers to the complete thickness of the strapping itself, which can be satisfied by a single-layer structure. Alternatively, the strapping may include multiple stacked sub-layers, with the sum of the thicknesses of each sub-layer satisfying the aforementioned range. Further options include the strapping comprising multiple sequentially stacked sub-layers, which can be connected end-to-end in a loop, or these sub-layers can be formed by wrapping the same strip-shaped strapping substrate multiple times around the housing 10.

[0105] The connectivity between adjacent sublayers can be enhanced through interface enhancement processes, such as using nano-coatings, microporous structure pretreatment, and chemical coupling agent treatment, to improve the interfacial bonding strength between each sublayer and reduce the possibility of interlayer delamination during the expansion of the housing 10.

[0106] Optionally, the tensile strength of the strapping 21 is greater than or equal to 3500 MPa, meaning that the strapping 21 can withstand high tensile loads without breaking. When the pressure inside the housing 10 increases, each strapping 21 needs to withstand a large circumferential tensile force. By limiting the tensile strength of the strapping 21, the possibility of the strapping 21 failing under extreme working conditions can be reduced.

[0107] Optionally, the elastic modulus of the strapping 21 is greater than or equal to 230 GPa, that is, the strapping 21 has high stiffness and is not easily stretched under pressure, which can effectively limit the expansion and deformation of the box 10, thereby ensuring the immediacy and effectiveness of the restraint effect.

[0108] Therefore, by ensuring that the strapping 21 meets the above-mentioned parameter conditions, the strapping 21 can have good structural integrity and strapping performance, thereby improving the overall reliability of the battery device 100.

[0109] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a battery device provided in some other embodiments of this application.

[0110] In some alternative embodiments, the housing 10 includes a top wall 14 and a bottom wall 15 disposed opposite each other along a first direction X, and a transition side wall 16 is connected between the top wall 14 and the bottom wall 15; the transition side wall 16 is arc-shaped and protrudes in a direction away from the battery cell 30.

[0111] Optionally, embodiments of this application can further improve the pressure resistance of the housing 10 by optimizing its geometry. Specifically, the housing 10 may include a top wall 14 and a bottom wall 15 disposed opposite to each other along a first direction X, with a transition sidewall 16 connecting them. The transition sidewall 16 protrudes away from the battery elevator to form an arc-shaped convex surface. This convex surface can effectively disperse the pressure inside the housing 10, reducing the possibility of stress concentration in the corner areas leading to cracking.

[0112] Furthermore, the top wall 14 and bottom wall 15 in the housing 10 can be flat, or the top wall 14 and bottom wall 15 can be convex in the same direction away from the battery cell 30, so that the housing 10 has an eggshell structure. This allows the radial and circumferential stress of the pressure to be dispersed through its geometric curvature, and the local impact or internal air pressure is evenly distributed throughout the housing, significantly improving the pressure resistance.

[0113] Optionally, the top wall 14 and the bottom wall 15 may have the same or different shapes and areas. The connection between the two and the transition side wall 16 can be smoothly connected by rounded corners. Alternatively, in an embodiment where the transition side wall 16 extends along an arc surface, the top wall 14 and the bottom wall 15 may be tangent to the arc surface to achieve a smooth and natural connection transition.

[0114] Optionally, the transition sidewalls 16 may be symmetrically arranged along at least one of the second direction Y and the third direction Z, so as to make the force distribution of the housing 10 more uniform. Furthermore, the transition sidewalls 16 may also be symmetrically arranged in the first direction X.

[0115] Optionally, the transition sidewall 16 may protrude in an arc shape, and the arc surface may be a circular arc surface, an elliptical arc surface, or other quadratic curve arc surface. The transition sidewall 16 may be an arc surface with a single curvature, or it may be a composite arc surface formed by splicing multiple arc surfaces with different curvatures. This application does not impose any specific limitations on this.

[0116] By designing the sidewalls of the housing 10 as outwardly convex arc-shaped walls, the pressure can be converted into compressive stress along the tangential direction of the curved surface, rather than bending stress perpendicular to the wall surface, thanks to the excellent mechanical properties of the arc-shaped structure. Therefore, compared to planar structures, arc-shaped structures can withstand higher internal pressure and are less prone to buckling failure, thus effectively improving the pressure resistance of the housing 10 itself.

[0117] Furthermore, by optimizing the pressure resistance through structural design, the housing 10 in this embodiment can have thinner walls compared to the planar structure housing 10, while maintaining the same required pressure threshold. This means that the weight of the housing 10 can be reduced while maintaining good structural strength. The synergistic effect of the curved structure of the shell and the strapping assembly 20 enables a higher pressure resistance level with a lighter overall weight.

[0118] In some alternative embodiments, the transition sidewall 16 includes a first sub-wall 161 and a second sub-wall 162 arranged along a first direction X, the first housing portion 11 includes a connected top wall 14 and a first sub-wall 161, and the second housing portion 12 includes a connected bottom wall 15 and a second sub-wall 162.

[0119] The housing 10 in this embodiment includes a first housing portion 11 and a second housing portion 12 that are interlocked along the first direction X. Based on this, when the aforementioned three walls are provided, the top wall 14 and a portion of the transition side wall 16 can be located in the first housing portion 11, and the bottom wall 15 and another portion of the transition side wall 16 can be located in the second housing portion 12.

[0120] Specifically, the transition sidewall 16 includes a first sub-wall 161 and a second sub-wall 162 arranged along the first direction X. The first sub-wall 161 is connected to the top wall 14 and together forms the first housing portion 11, and the second sub-wall 162 is connected to the bottom wall 15 and together forms the second housing portion 12. The connection between the first sub-wall 161 and the top wall 14, and the connection between the second sub-wall 162 and the bottom wall 15, can be achieved by welding, integral installation, or other fixed connection methods to improve the connection strength.

[0121] Optionally, the ends of the first sub-wall 161 and the second sub-wall 162 near each other may be provided with connecting flanges. The connecting flanges may protrude in a direction away from the battery cell 30. The first housing part 11 and the second housing part 12 may be detachably connected by the cooperation of the connecting holes on the flanges and the fastening components.

[0122] By setting the transition sidewall 16 as two sub-walls connected along the first direction X, it is convenient to maintain the internal battery cells 30.

[0123] In some alternative embodiments, the thickness of the housing 10 is 1.5mm-4mm, and the thickness of at least a portion of the top wall 14 and bottom wall 15 is greater than the thickness of the transition sidewall 16.

[0124] Optionally, the thickness of the housing 10 can be 1.5mm-4mm. For example, it can be any one of 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or somewhere in between. Furthermore, the thickness of the housing 10 can be uniform throughout to facilitate processing; alternatively, the top wall 14 and bottom wall 15 of the housing 10 can be selectively thickened to improve the resistance to deformation in those areas.

[0125] Optionally, in embodiments where at least one of the top wall 14 and bottom wall 15 is thickened, the wall surface can be configured such that its thickness gradually decreases along the direction from the center to the edge, until it decreases to the same thickness as the transition sidewall 16 at the edge. This allows the thickness of the housing 10 to be adapted to its deformation pressure, improving the overall bending resistance and reliability of the housing 10. Alternatively, the thickness of the top wall 14 and bottom wall 15 can be kept consistent at each location to facilitate the processing of the housing 10.

[0126] By limiting the thickness of the enclosure 10 and optimizing its thickness distribution, the reliability of the enclosure 10 can be further improved, achieving a balance between its pressure resistance, volume, and weight.

[0127] In some optional embodiments, the ratio between the dimension of the housing 10 in the second direction Y and the dimension of the housing 10 in the third direction Z is 1.3-2, and the first direction X, the second direction Y and the third direction Z are arranged to intersect each other; along the second direction Y, the ratio between the dimension of the transition sidewall 16 located on one side of the top wall 14 and the dimension of the top wall 14 is 0.4-0.6.

[0128] Optionally, the dimension of the box 10 in the second direction Y is denoted as L1, and the dimension of the box 10 in the third direction Z is denoted as L2. Then 1.3≤L1 / L2≤2, that is, the ratio of the length to the width of the box 10 can be between 1.3 and 2, for example, it can be any one of 1.3, 1.5, 1.7, 1.9, 2 or between any two of them.

[0129] Meanwhile, the dimension of the transition sidewall 16 located on one side of the top wall 14 in the second direction Y is denoted as L3. That is, when the housing 10 is projected orthographically along the first direction X, the orthographic projection of the top wall 14 in the second direction Y has orthographic projections of the transition sidewall 16 on both sides respectively. The dimension of one side of the orthographic projection in the second direction Y is denoted as L3, and the dimension of the top wall 14 along the second direction Y is denoted as L4. Then, 0.4≤L3 / L4≤0.6. That is, in the length direction of the housing 10, the ratio between the extension dimension of the single-sided transition sidewall 16, that is, the dimension of the transition sidewall 16 protruding away from the battery cell 30 relative to the top wall 14, and the dimension of the top wall 14 is 0.4-0.6, specifically any one of 0.4, 0.45, 0.5, 0.55, 0.6, or any two of them.

[0130] By quantitatively defining the geometric proportions of the housing 10, the mechanical properties of the housing 10 can be further optimized, reducing the possibility that an imbalance in the length-to-width ratio of the housing 10 will lead to a decrease in its bending resistance in a specific direction. At the same time, while allowing the curved structure to fully utilize its pressure-bearing advantages, sufficient planar areas can be reserved for the top wall 14 and bottom wall 15 to facilitate the arrangement and heat dissipation of the battery cells 30.

[0131] In some optional embodiments, the transition sidewall 16 is an arc surface, with a central angle of 150°-210° and a radius of curvature of 50mm-300mm. The pressure resistance of the housing 10 is further improved by defining its shape.

[0132] Optionally, in the embodiment where the housing 10 adopts the aforementioned eggshell structure, the transition sidewall 16 can be an arc surface as a whole, that is, on at least one cross section parallel to the first direction X and the extension direction of the transition sidewall 16, the cross-sectional shape formed by the transition sidewall 16 is arc-shaped.

[0133] Based on this, the radius of curvature of the arc can be 50mm-300mm, and can be further selected as 100mm-200mm, for example, it can be any one of 100mm, 125mm, 150mm, 175mm, 200mm or in between. By limiting the radius of curvature of the transition sidewall 16, the degree of bending of the transition sidewall 16 can be limited accordingly, that is, the degree to which the transition sidewall 16 protrudes away from the battery cell 30 can be limited, so that it is adapted to the arrangement of the internal components of the housing 10 and the required pressure resistance.

[0134] Meanwhile, the central angle of the arc-shaped cross-section formed by the transition sidewall 16 can be between 150° and 210°, for example, it can be any one of 150°, 170°, 190°, and 210° or between any two of them. By limiting the central angle and radius of curvature of the transition sidewall 16, the length of the arc-shaped cross-section formed by the multi-degree sidewall can be limited accordingly, thereby limiting the shape and size of the transition sidewall 16.

[0135] It is understood that the cross-sectional shape formed by the transition sidewall 16 in the embodiments of this application can also be a non-circular arc curve, such as an elliptical arc, a parabolic arc, etc., in which case the equivalent radius of curvature can be used for parameterization.

[0136] By quantitatively defining the central angle and radius of curvature of the transition sidewall 16, the stress distribution in the transition sidewall 16 and its adjacent top wall 14 and bottom wall 15 can be further optimized, giving the arc-shaped sidewall a reasonable arch height and effectively converting internal pressure into compressive stress along the curved surface. If the central angle is too small, the arc effect is not obvious, and the improvement in bearing capacity is limited; if the central angle is too large, the arc surface is too full, which may lead to local stress concentration. At the same time, the transition sidewall 16 of this size is easy to adapt to the required box size 10, and can form a smooth arc transition.

[0137] In some alternative embodiments, the strapping 21 includes multiple stacked sub-layers, and the thickness of the strapping 21 is 5mm-8mm.

[0138] As mentioned above, the thickness of the strapping 21 in this embodiment can be 2mm-8mm. In embodiments where the housing 10 includes a top wall 14, a bottom wall 15, and a transition side wall 16, the thickness of the strapping 21 can be specifically set to 5mm-8mm, for example, any one of 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, and 8mm, or between any two of them. By optimizing the structural shape of the housing 10, the required thickness of the housing 10 can be reduced. In embodiments where the housing 10 is relatively thin, the strapping 21 can be specifically set to have a larger thickness to ensure the overall reliability of the battery device 100.

[0139] It is understandable that the specific thickness of the strapping 21 can be selected based on parameters such as the thickness of the box 10 itself and the capacity of the internal battery cell 30. On the basis that the thickness of the strapping 21 and the thickness of the box 10 both meet the aforementioned numerical range, a thinner box 10 can be fitted with a thicker strapping 21, thereby maintaining the overall strength.

[0140] By further limiting the thickness of the strapping 21 on the eggshell-shaped enclosure 10, the cross-sectional area and load-bearing capacity of the strapping 21 can be significantly increased, thereby strengthening the external constraint provided by the strapping 21. The stronger constraint force provided by the external strapping 21 compensates for the reduction in the thickness of the enclosure 10 itself. At the same time, since the strapping 21 itself is very lightweight, this structure of thinning the enclosure 10 and thickening the strapping 21 can reduce weight while maintaining good reliability and still adapting to high-pressure operating conditions.

[0141] In some optional embodiments, the housing 10 includes an inner support layer, an outer support layer, and a support frame connected between the inner and outer support layers, all spaced apart along its thickness. The support frame has multiple perforations. By providing a perforated frame structure in the middle layer, the weight of the housing 10 is reduced, and the heat conduction efficiency of the housing 10 is decreased.

[0142] Optionally, the box 10 in this embodiment can adopt a hollow sandwich panel structure, that is, a three-dimensional grid-like skeleton is set between two continuously extending layer structures to reduce the weight of the box 10 while maintaining a certain rigidity and strength.

[0143] Specifically, the enclosure 10 includes an inner support layer and an outer support layer spaced apart along its thickness. A support frame is provided in the gap between the two layers. The support frame is connected and fixed to the two support layers on both sides, forming a sandwich structure with hollow holes and cavities inside. The inner support layer, outer support layer, and support frame can be made of the same material, such as aluminum alloy. The enclosure 10 can be manufactured in one piece by hot pressing or molding to improve processing efficiency. Alternatively, the inner support layer and outer support layer can be made of different materials, such as high-strength steel for the outer layer and lightweight aluminum alloy for the inner layer, to balance weight and protective performance.

[0144] Optionally, the supporting frame has a three-dimensional mesh structure, which can be a honeycomb structure, a corrugated plate structure, or a cubic scaffolding structure, etc., with perforations and / or cavities inside, forming a lightweight three-dimensional perforated supporting structure. Depending on the shape of the frame structure, the perforations can be circular, hexagonal, rhomboid, etc.

[0145] Optionally, the space between the inner support layer and the outer support layer of the enclosure 10 can also be filled with thermal insulation material. For example, lightweight thermal insulation materials such as aerogel and ceramic fiber can be filled into the hollow holes / hollow bars of the support frame to further improve the thermal insulation performance of the enclosure 10.

[0146] By employing a composite structure of double-walled enclosure 10 and a hollowed-out frame, lightweight enclosure 10 can be achieved, reducing material usage while maintaining rigidity and strength. Simultaneously, the air gap and hollowed-out structure between the inner and outer support layers form an effective thermal barrier, blocking heat conduction and delaying heat dissipation, thus buying time for personnel evacuation and safe handling in extreme conditions such as thermal runaway.

[0147] In some alternative embodiments, the housing 10 is provided with a pressure relief assembly located in an area not covered by the strapping assembly 20.

[0148] Optionally, to ensure the reliability of the battery device 100 under extreme conditions such as thermal runaway, the housing 10 may be equipped with a pressure relief component, including an explosion-proof valve. Furthermore, the orthographic projection of the strapping component 20 on the housing 10 is offset from the pressure relief component, meaning that the strapping strap 21 does not cover or obstruct the area directly above the pressure relief component.

[0149] Specifically, in embodiments where the strapping 21 is narrow and can be easily offset from the pressure relief component, in embodiments where the strapping 21 has a large area or cannot be completely offset due to structural limitations, clearance holes or clearance openings can be made on the strapping 21 at the position corresponding to the pressure relief component, thereby reducing the impact of the strapping 21 on the operation of the pressure relief component.

[0150] By staggering the strapping assembly 20 and the pressure relief assembly, the pressure relief assembly can be activated promptly and smoothly release pressure when the internal pressure of the housing 10 exceeds the safety threshold, while simultaneously reinforcing the housing 10. Furthermore, the pressure relief assembly is typically located in areas of the housing 10 where pressure is concentrated or prone to rupture; these areas are often also areas requiring reinforcement by the strapping 21. Staggering their arrangement makes the pressure relief assembly easily accessible and inspected, facilitating routine maintenance and replacement.

[0151] In some alternative embodiments, the strapping 21 includes a fiber braided layer and a covering layer, with the fiber braided layer embedded within the covering layer.

[0152] The strapping 21 in this embodiment is used to provide a binding and securing force to the box 10 from the outside. Optionally, the strapping 21 can be made by injection molding process, including a fiber braided layer and a covering layer covering the fiber braided layer. That is, the strapping 21 is made of fiber reinforced composite material, with the fiber braided layer as the reinforcement and the covering layer as the matrix.

[0153] Specifically, the fiber braided layer can be unidirectional fiber cloth, bidirectional braided cloth, or multiaxial braided cloth, and the fiber type can be carbon fiber, glass fiber, aramid fiber, or basalt fiber; the infusion material can be a resin material, such as thermosetting resin, such as epoxy resin, polyester resin, etc., or thermoplastic resin, such as polypropylene, nylon, etc.

[0154] When manufacturing the strapping 21, a fiber braided layer can be laid first according to the shape of the box 10 to be strapped, and then a filling material can be injected to impregnate the fiber braided layer. After the filling material is cured and molded, the strapping 21 can be obtained. Alternatively, the strapping 21 can also be made by directly laying prepreg and then curing it.

[0155] In the embodiment where the strapping 21 is in the shape of a ring, its opposite two ends are connected to each other. At the joint, the fiber braided layer can reserve a 20-30mm braided transition section at the end. Then, the biaxial braiding-hot pressing fusion technology is used to make the fiber material form a burr-like anchoring structure at the end, which is cross-connected and fixed and embedded in the covering layer to achieve a mechanical interlocking connection, thereby improving the structural strength of the strapping 21.

[0156] By employing a casting molding process to process the strapping 21, it achieves high specific strength and high specific modulus, providing strength comparable to metal while significantly reducing weight. Furthermore, the fiber braided layer is flexible, allowing it to easily conform to various complex curved surfaces of the housing 10, giving the strapping 21 excellent shape conformability. Simultaneously, the composite material exhibits good chemical corrosion resistance, making it suitable for battery applications that may come into contact with electrolytes or humid environments.

[0157] In some alternative embodiments, at least one of the side surface of the housing 10 facing the battery cell 30 and the side surface facing away from the battery cell 30 is provided with a heat insulation layer.

[0158] In some alternative embodiments, the thickness of the insulation layer is 5mm-15mm.

[0159] In addition to the binding assembly 20, a heat insulation layer can be further added to at least one of the inner or outer walls of the enclosure 10 to further improve the heat insulation and pressure resistance of the enclosure 10. This heat insulation layer can be a single-layer structure made of heat insulation material, such as aerogel felt, ceramic fiber felt, VIP board (Vacuum Insulation Panel), aluminum silicate fiberboard, polyurethane foam, or other high-temperature resistant heat insulation materials; alternatively, the heat insulation layer can be a composite structure composed of multiple sub-layers, for example, it can simultaneously include a reflective layer and a heat insulation layer to enhance the heat insulation effect. The heat insulation layer can be conformally arranged to the wall of the enclosure 10 to which it is connected and can be stacked and connected to each other. The connection between the heat insulation layer and the enclosure 10 can be adhesive, compression, heat fusion, or fastener connection, etc.

[0160] Furthermore, the thickness of the heat insulation layer can be 5mm-15mm, for example, any one of 5mm, 7mm, 9mm, 11mm, 13mm, and 15mm, or between any two of them. Optionally, in an embodiment where the battery device 100 includes a single-layer heat insulation layer, the thickness of the heat insulation layer can be 5mm-15mm. In an embodiment where the battery device 100 includes multiple heat insulation layers and the orthographic projections of these heat insulation layers on the housing 10 overlap each other, the sum of the thicknesses of the multiple heat insulation layers can be 5mm-15mm.

[0161] By further adding a heat insulation layer to the housing 10, heat can be effectively blocked from being transferred to the outside of the housing 10 under extreme conditions such as thermal runaway, reducing the possibility of high temperature causing damage to surrounding equipment or personnel. At the same time, it can also block external heat from being transferred to the inside, maintaining the stability of the battery's operating environment. By limiting the thickness of the heat insulation layer to the aforementioned range, it is possible to provide effective heat insulation without excessively occupying internal space of the battery device 100 or adding too much weight.

[0162] Secondly, according to the embodiments of this application, an electrical device is provided, including the battery device 100 in any embodiment of the first aspect, the battery device 100 being used to provide electrical energy.

[0163] The electrical device in this embodiment has all the beneficial effects of the battery device 100 in the first aspect. For details, please refer to the specific description of the battery device 100 in the above embodiments. This embodiment will not repeat the description here.

[0164] This application provides a battery device 100, including a housing 10, a strapping assembly 20, and a battery cell 30. The housing 10 includes a first housing portion 11 and a second housing portion 12 that are detachably connected. The first housing portion 11 and the second housing portion 12 are interlocked and enclosed along a first direction X to form a receiving portion 13. The strapping assembly 20 includes a plurality of straps 21 that are wrapped around the outer periphery of the housing 10 and arranged around the housing 10. The battery cell 30 is disposed in the receiving portion 13.

[0165] The strapping 21 is ring-shaped, and multiple strapping 21 include a first strapping 211 and a second strapping 212. The circumferential axis of the first strapping 211 is parallel to the second direction Y, and the circumferential axis of the second strapping is parallel to the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other in pairs. At least some of the first strapping 211 and the second strapping 212 intersect each other and are partially stacked along the first direction X. The housing 10 includes a top wall 14 and a bottom wall 15 arranged opposite each other along the first direction X. A transition sidewall 16 connects the top wall 14 and the bottom wall 15. The transition sidewall 16 is arc-shaped and protrudes away from the battery cell 30.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: The housing includes a first housing portion and a second housing portion that are detachably connected, wherein the first housing portion and the second housing portion are interlocked and enclosed along a first direction to form a receiving portion; The strapping assembly includes multiple straps wrapped around the outer periphery of the box and arranged around the box, at least a portion of the circumferential axis of the straps intersecting the first direction, and the straps include multiple stacked sub-layers; A single battery cell is disposed in the receiving portion.

2. The battery device according to claim 1, characterized by The strapping is looped, and the multiple strappings include a first strapping and a second strapping. The circumferential axis of the first strapping is parallel to a second direction, and the circumferential axis of the second strapping is parallel to a third direction. The first direction, the second direction, and the third direction intersect each other, and at least a portion of the first strapping and the second strapping intersect each other and are partially stacked along the first direction.

3. The battery device of claim 2, wherein, Multiple first straps are arranged along the second direction, and the spacing between adjacent first straps first decreases and then increases along the second direction; And / or, a plurality of second strapping bands are arranged along the third direction, and the spacing between adjacent second strapping bands first decreases and then increases along the third direction.

4. The battery device of claim 1, wherein The strapping band satisfies at least one of the following conditions: (1) The thickness of the strapping is 2mm-8mm; (2) The tensile strength of the strapping is greater than or equal to 3500 MPa; (3) The elastic modulus of the strapping is greater than or equal to 230 GPa.

5. The battery device according to any one of claims 1 to 4, characterized by, The enclosure includes a top wall and a bottom wall disposed opposite to each other along the first direction, and a transition side wall connects the top wall and the bottom wall. The transition sidewall is arc-shaped and protrudes away from the battery cell.

6. The battery device of claim 5, wherein The transition sidewall includes a first sub-wall and a second sub-wall arranged along the first direction; The first housing portion includes the connected top wall and the first sub-wall, and the second housing portion includes the connected bottom wall and the second sub-wall.

7. The battery device of claim 5, wherein The thickness of the enclosure is 1.5mm-4mm, and the thickness of at least a portion of the top wall and the bottom wall is greater than the thickness of the transition sidewall.

8. The battery device of claim 5, wherein, The ratio between the dimension of the box in the second direction and the dimension of the box in the third direction is 1.3-2, and the first direction, the second direction and the third direction are arranged to intersect each other; Along the second direction, the ratio between the dimension of the transition sidewall located on one side of the bottom wall and the dimension of the bottom wall is 0.4-0.

6.

9. The battery device of claim 5, wherein, The transition sidewall is an arc surface, the central angle of the transition sidewall is 150°-210°, and the radius of curvature of the transition sidewall is 50mm-300mm.

10. The battery device of claim 5, wherein, The thickness of the strapping is 5mm-8mm.

11. The battery device of claim 5, wherein, The housing includes an inner support layer, an outer support layer, and a support frame connected between the inner support layer and the outer support layer, which are spaced apart along their thickness. The support frame has multiple perforated holes.

12. The battery device of claim 1, wherein, The enclosure is equipped with a pressure relief component, which is located in the area of ​​the enclosure not covered by the binding component.

13. The battery device according to claim 1, characterized in that, The strapping includes a fiber braided layer and a covering layer, with the fiber braided layer embedded within the covering layer.

14. The battery device according to claim 1, characterized in that, At least one of the surfaces of the housing facing the battery cell and the surface facing away from the battery cell is provided with a heat insulation layer.

15. The battery device according to claim 14, characterized in that, The thickness of the insulation layer is 5mm-15mm.

16. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-15, the battery device being used to provide electrical energy.

Images