Battery apparatus and electric device

Abstract

A battery apparatus (100) and an electric device. The battery apparatus (100) comprises battery cells (10), a flexible circuit board (30) and a sleeve (40), wherein the flexible circuit board (30) is electrically connected to the battery cells (10); the flexible circuit board (30) comprises a body (31) and a stretchable / retractable portion (32) connected to the body (31); the stretchable / retractable portion (32) can be deformed by stretch / retraction in the length direction of the body (31); the stretchable / retractable portion (32) protrudes from the body (31) in the thickness direction of the body (31); and the sleeve (40) is sleeved over the stretchable / retractable portion (32).

Description

Battery devices and electrical equipment

[0001] Priority information

[0002] This application claims priority and benefits to patent application No. 202520284666.8, filed with the China National Intellectual Property Administration on February 21, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology

[0004] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars. Battery devices may include individual battery cells and flexible circuit boards, with the flexible circuit board positioned on one side of the battery cell. During use, the battery cell may expand, causing the flexible circuit board to shift position and rub against or scrape against other structural components, posing a significant risk of damage to the flexible circuit board. Summary of the Invention

[0005] In view of the above problems, this application provides a battery device and an electrical appliance that can reduce the risk of damage to flexible circuit boards.

[0006] In a first aspect, this application provides a battery device, which includes a battery cell, a flexible circuit board, and a sleeve. The flexible circuit board is electrically connected to the battery cell. The flexible circuit board includes a body and a telescopic part connected to the body. The telescopic part is capable of telescopic deformation along the length direction of the body and protrudes from the body along the thickness direction of the body. The sleeve is sleeved outside the telescopic part.

[0007] In the battery device described above, the telescopic part can absorb the stress in the length direction of the flexible circuit board, and the sleeve is fitted over the telescopic part, so that the telescopic part can come into contact with the battery device's housing and other components, reducing the risk of damage to the flexible circuit board.

[0008] In some embodiments, the sleeve includes a first tube and a second tube detachably connected to the first tube, the first tube and the second tube together forming a sleeve space, and the telescopic part is accommodated within the sleeve space.

[0009] In the above technical solution, the first pipe and the second pipe are detachably connected, which makes the sleeve easy to install and can improve the efficiency of the sleeve being installed outside the expansion joint.

[0010] In some embodiments, the first pipe and the second pipe are fastened together.

[0011] In the above technical solution, the first pipe and the second pipe are fastened together, which can improve the assembly efficiency of the first pipe and the second pipe.

[0012] In some embodiments, the first pipe includes a first enclosure wall and a first engaging wall connected to the first enclosure wall, and the second pipe includes a second enclosure wall and a second engaging wall connected to the second enclosure wall. The first engaging wall and the second engaging wall are engaged and connected, and the first enclosure wall, the first engaging wall, the second enclosure wall and the second engaging wall together form the sleeve space.

[0013] In the above technical solution, the first locking wall and the second locking wall are locked together, making the connection between the first pipe and the second pipe stable. In addition, the first enclosure wall, the first locking wall, the second enclosure wall and the second locking wall together form the sleeve space, so that the sleeve can be sleeved outside the telescopic part.

[0014] In some embodiments, the first locking wall includes a first connecting arm and a first hook, the first connecting arm being connected to the first enclosure wall, and the first hook being formed at the end of the first connecting arm away from the first enclosure wall. The second locking wall includes a second connecting arm and a second hook, the second connecting arm being connected to the second enclosure wall, and the second hook being formed at the end of the second connecting arm away from the second enclosure wall. The first hook engages with the second hook.

[0015] In the above technical solution, the first latch and the second latch engage, so that the first pipe and the second pipe can be engaged together.

[0016] In some embodiments, the first enclosure includes a first barrier portion and a first connecting portion connected to the first barrier portion, the first barrier portion arching outward from the first connecting portion in a direction away from the second enclosure; and / or,

[0017] The second enclosure includes a second enclosure portion and a second connecting portion connected to the second enclosure portion, the second enclosure portion arching out from the second connecting portion in a direction away from the first enclosure.

[0018] In the above technical solution, the first enclosure portion arches from the first connecting portion toward the direction away from the second enclosure wall, and / or the second enclosure portion arches from the second connecting portion toward the direction away from the first enclosure wall, which makes it easier to form the sleeve space and is beneficial to surround the telescopic portion.

[0019] In some embodiments, the telescopic portion is corrugated along the length of the body.

[0020] In the above technical solution, the corrugated telescopic part can easily achieve the telescopic function.

[0021] In some embodiments, the sleeve is spaced apart from the battery cell.

[0022] In the above technical solution, the sleeve and the battery cell are spaced apart, which reduces the compression on the sleeve when the battery cell expands and deforms, thereby reducing the deformation of the sleeve and improving the protection of the expansion joint.

[0023] In some embodiments, the battery device includes electrical components, and the flexible circuit board includes an end connected to the telescopic portion, the end being located on the side of the telescopic portion opposite to the body, the end being provided with a connector that plugs into the electrical components.

[0024] In the above technical solution, the connector enables the flexible circuit board to be electrically connected to other electrical components.

[0025] Secondly, this application provides an electrical device including the battery device described in the above embodiments.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0029] Figure 2 is a perspective view of a battery device according to some embodiments of this application;

[0030] Figure 3 is a schematic diagram of the internal structure of a battery device according to some embodiments of this application;

[0031] Figure 4 is a partial perspective view of one of the battery devices according to some embodiments of this application;

[0032] Figure 5 is a second partial perspective view of a battery device according to some embodiments of this application;

[0033] Figure 6 is a partial plan view of a battery device according to some embodiments of this application;

[0034] Figure 7 is a cross-sectional schematic diagram of the sleeve according to some embodiments of this application;

[0035] Figure 8 is an exploded view of the sleeve in some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100-Battery device; 10-Battery cell; 20-Box; 30-Flexible circuit board; 31-Body; 32-Telescopic part; 33-End; 40-Sleeve; 41-First pipe; 411-First enclosure; 412-First locking wall; 413-First connecting arm; 414-First hook; 415-First enclosure; 416-First connecting part; 42-Second pipe; 421-Second enclosure; 422-Second locking wall; 423-Second connecting arm; 424-Second hook; 425-Second enclosure; 426-Second connecting part; 43-Sleeving space; 50-Connector; 60-Electrical component; 1000-Vehicle; 200-Controller; 300-Motor. Embodiments of the present invention

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0043] 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.

[0044] In this application, "multiple" means two or more (including two).

[0045] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0046] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0047] In related technologies, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars. Battery devices may include individual battery cells and flexible circuit boards, with the flexible circuit board positioned on one side of the battery cell. The flexible circuit board can transmit signals; for example, it can transmit sampling signals such as the current of the battery cell.

[0048] Generally, flexible circuit boards are elongated strips with both ends fixed along their length. In this case, if a battery cell deforms, it can easily pull on the flexible circuit board, causing it to break or be damaged. To address this, flexible circuit boards can be designed with a telescopic structure. When the flexible circuit board is stretched, the telescopic structure can absorb the tensile force, reducing the risk of the flexible circuit board being damaged.

[0049] However, the telescopic part generally protrudes from the surface of the flexible circuit board. During the expansion and deformation of the battery cell, the telescopic part moves in the thickness direction of the flexible circuit board, which can easily cause friction and scratches with other structural components such as the battery box, making the telescopic part prone to damage.

[0050] Therefore, this application provides a battery device, which includes a battery cell, a flexible circuit board, and a sleeve. The flexible circuit board is electrically connected to the battery cell. The flexible circuit board includes a body and a telescopic part connected to the body. The telescopic part is capable of telescopic deformation along the length direction of the body and protrudes from the body along the thickness direction of the body. The sleeve is sleeved outside the telescopic part.

[0051] In the battery device described above, the telescopic part can absorb the stress in the length direction of the flexible circuit board, and the sleeve is fitted over the telescopic part, so that the telescopic part can come into contact with the battery device's housing and other components, reducing the risk of damage to the flexible circuit board.

[0052] This application also provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, tablet computer, laptop computer, electric toy, power tool, electric vehicle, electric car, ship, etc. The electric toy can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.

[0053] In some implementations, the battery device can be used as an energy storage device.

[0054] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0055] Referring to Figure 1, vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Further, vehicle 1000 can be a commercial vehicle. A battery device 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000; for example, battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. Controller 200 controls the battery device 100 to supply power to motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0056] 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.

[0057] Referring to Figures 2-3, in the embodiments of this application, the battery device 100 may include one or more battery assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple battery cells 10; a battery assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, a battery module may be formed by bundling multiple battery cells 10 together with cable ties.

[0058] In the embodiments of this application, the battery device 100 includes a housing 20, which may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 20 for housing the battery assembly. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing 20 for housing the battery assembly.

[0059] In embodiments of this application, the housing 20 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0060] In this embodiment, the battery cell 10 can be a rechargeable battery, which refers to a battery cell 10 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 10 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 this embodiment is not limited to this. The battery cell 10 can be flat, cuboid, or other shapes, and this embodiment is not limited to this either.

[0061] Please refer to Figures 3-6. In the battery device 100 of this application embodiment, the battery device 100 includes a battery cell 10, a flexible circuit board 30, and a sleeve 40. The flexible circuit board 30 is electrically connected to the battery cell 10. The flexible circuit board 30 includes a body 31 and a telescopic part 32 connected to the body 31. The telescopic part 32 can be telescopically deformed along the length direction of the body 31 and protrudes from the body 31 along the thickness direction of the body 31. The sleeve 40 is sleeved on the telescopic part 32.

[0062] Specifically, the battery cell 10 may include a casing and an electrode assembly. The casing protects the internal structure of the battery cell 10 and improves its lifespan. The electrode assembly of the battery cell 10 may be a wound electrode assembly or a stacked electrode assembly. The electrode assembly may include electrode sheets and tabs. The electrode assembly may be formed by winding electrode sheets or by stacking electrode sheets.

[0063] The flexible printed circuit board (FPC) 30 is a component that can electrically connect two parts. The body 31 of the FPC 30 is the largest part of the FPC 30. The body 31 is elongated and flat. The telescopic part 32 is an integral structure with the body 31. The telescopic part 32 can be wavy, or in other words, the telescopic part 32 can be formed by folding a portion of the flexible printed circuit board 30, thereby allowing the telescopic part 32 to stretch and deform along the length of the body 31. Because the telescopic part 32 is formed by folding, its dimension along the thickness direction of the body 31 is larger than the thickness of the body 31.

[0064] The sleeve 40 has a hollow structure, allowing the flexible circuit board 30 to pass through it and the telescopic part 32 to be housed within it. It should be noted that even when the sleeve 40 is fitted over the telescopic part 32, the telescopic part 32 can still expand and contract along the length of the body 31.

[0065] Therefore, in the battery device 100 of the above embodiment, the telescopic part 32 can absorb the stress in the length direction of the flexible circuit board 30, and the sleeve 40 is sleeved on the outside of the telescopic part 32, so that the telescopic part 32 can come into contact with the casing 20 and other components of the battery device 100, thereby reducing the risk of damage to the flexible circuit board 30.

[0066] Please refer to Figures 5-8. In some embodiments, the sleeve 40 includes a first tube 41 and a second tube 42 detachably connected to the first tube 41. The first tube 41 and the second tube 42 together form a sleeve space 43, and the telescopic part 32 is accommodated in the sleeve space 43.

[0067] Specifically, the first tube 41 and the second tube 42 are two detachable parts of the sleeve 40, and the first tube 41 and the second tube 42 can protect both sides of the telescopic part 32 along the thickness direction of the body 31. The first tube 41 and the second tube 42 can be made of wear-resistant materials. For example, at least one of the first tube 41 and the second tube 42 can be made of materials such as Teflon or rubber.

[0068] In the above technical solution, the first pipe 41 and the second pipe 42 are detachably connected, which makes the sleeve 40 easy to install and can improve the efficiency of the sleeve 40 being fitted outside the telescopic part 32.

[0069] In some embodiments, the first pipe 41 and the second pipe 42 are snap-fitted together. For example, the first pipe 41 and the second pipe 42 have a snap-fit ​​structure, and the first pipe 41 and the second pipe 42 can be snap-fitted together through the snap-fit ​​structure.

[0070] In the above technical solution, the first pipe 41 and the second pipe 42 are fastened together, which can improve the assembly efficiency of the first pipe 41 and the second pipe 42.

[0071] Please refer to Figures 7-8. In some embodiments, the first pipe 41 includes a first enclosure 411 and a first locking wall 412 connected to the first enclosure 411, and the second pipe 42 includes a second enclosure 421 and a second locking wall 422 connected to the second enclosure 421. The first locking wall 412 and the second locking wall 422 are engaged and connected. The first enclosure 411, the first locking wall 412, the second enclosure 421 and the second locking wall 422 together form a housing space 43.

[0072] Specifically, both the first enclosure wall 411 and the second enclosure wall 421 are sheet-like structures. The first locking wall 412 and the second locking wall 422 are also generally sheet-like structures. The first enclosure wall 411 and the second wall are located on opposite sides of the telescopic portion 32 along the thickness direction of the body 31. The first locking wall 412 and the first enclosure wall 411 can be an integral structure. There are two first locking walls 412, located on opposite sides of the first enclosure wall 411.

[0073] The second locking wall 422 and the second enclosure wall 421 can be an integral structure. There are two second locking walls 422, which are located on opposite sides of the second enclosure wall 421.

[0074] In the above technical solution, the first locking wall 412 and the second locking wall 422 are locked together, so that the first pipe 41 and the second pipe 42 are stably connected. In addition, the first enclosure wall 411, the first locking wall 412, the second enclosure wall 421 and the second locking wall 422 together form a sleeve space 43, so that the sleeve 40 can be sleeved outside the telescopic part 32.

[0075] Please refer to Figures 7-8. In some embodiments, the first locking wall 412 includes a first connecting arm 413 and a first hook 414. The first connecting arm 413 is connected to the first enclosure wall 411, and the first hook 414 is formed at the end of the first connecting arm 413 away from the first enclosure wall 411. The second locking wall 422 includes a second connecting arm 423 and a second hook 424. The second connecting arm 423 is connected to the second enclosure wall 421, and the second hook 424 is formed at the end of the second connecting arm 423 away from the second enclosure wall 421. The first hook 414 and the second hook 424 engage.

[0076] Specifically, the first connecting arm 413 and the second connecting arm 423 can be sheet-like structures. Both the first connecting arm 413 and the second connecting arm 423 are cantilever beam structures, or in other words, one end of the first connecting arm 413 and the second connecting arm 423 is a fixed end, and the other end is a free end. In order to make the engagement efficiency of the first engaging wall 412 and the second engaging wall 422 higher, the first connecting arm 413 and the second connecting arm 423 can be elastic, or in other words, the first connecting arm 413 and the second connecting arm 423 can elastically deform, making it easier for the first engaging wall 412 and the second engaging wall 422 to engage together.

[0077] The first hook 414 is protruding, and the first hook 414 and the first connecting arm 413 are an integral structure. Similarly, the second hook 424 is also protruding, and the second hook 424 and the second connecting arm 423 are an integral structure.

[0078] In the above technical solution, the first latch and the second latch 424 engage, so that the first pipe 41 and the second pipe 42 can be engaged together.

[0079] Please refer to Figures 7-8. In some embodiments, the first enclosure 411 includes a first enclosure portion 415 and a first connecting portion 416 connected to the first enclosure portion 415. The first enclosure portion 415 arches from the first connecting portion 416 in a direction away from the second enclosure 421.

[0080] Specifically, the first connecting portion 416 forms one side edge of the first enclosure 411, and the first connecting portion 416 and the first enclosure portion 415 are an integral structure. Therefore, the first enclosure portion 415 arches from the first connecting portion 416 in a direction away from the second enclosure 421, which makes it easier to form the sleeve space 43 and facilitates the first pipe 41 and the second pipe 42 to surround the telescopic portion 32.

[0081] Please refer to Figures 7-8. In some embodiments, the second enclosure 421 includes a second enclosure portion 425 and a second connecting portion 426 connected to the second enclosure portion 425. The second enclosure portion 425 arches from the second connecting portion 426 in a direction away from the first enclosure 411.

[0082] Specifically, the second connecting portion 426 forms one side edge of the second enclosure 421, and the second connecting portion 426 and the second enclosure portion 425 are integral structures. Therefore, the second enclosure portion 425 arches from the second connecting portion 426 in a direction away from the first enclosure 411, which makes it easier to form the sleeve space 43 and facilitates the first pipe 41 and the second pipe 42 surrounding the telescopic portion 32.

[0083] Referring to Figure 5, in some embodiments, the telescopic portion 32 is corrugated along the length of the body 31. Specifically, the telescopic portion 32 has multiple folded portions, which make the telescopic portion 32 corrugated. When the telescopic portion 32 is subjected to tension, the telescopic portion 32 extends; after the tension is removed, the telescopic portion 32 retracts. Thus, in the above technical solution, the corrugated telescopic portion 32 easily achieves the telescopic function.

[0084] Referring to Figure 3, in some embodiments, the sleeve 40 is spaced apart from the battery cell 10. Alternatively, there is a gap between the sleeve 40 and the battery cell 10. In the above technical solution, the sleeve 40 is spaced apart from the battery cell 10, which reduces the compression on the sleeve 40 when the battery cell 10 expands and deforms, thereby reducing the deformation of the sleeve 40 and improving the protection of the telescopic part 32.

[0085] Referring to Figures 3 and 5, in some embodiments, the battery device 100 includes an electrical component 60, and the flexible circuit board 30 includes an end 33 connected to the telescopic portion 32. The end 33 is located on the side of the telescopic portion 32 opposite to the body 31, and the end 33 is provided with a connector 50, which is plugged into the electrical component 60. Specifically, the connector 50 can be connected to the electrical component 60 of the battery device 100, such as a control motherboard or a battery monitoring unit. This allows the battery cell 10 to be connected to the circuit board via the flexible circuit board 30 and the connector 50. In the above technical solution, the connector 50 enables the flexible circuit board 30 to be electrically connected to the electrical component 60.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0087] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, wherein, The battery device includes: Battery cell; A flexible circuit board, electrically connected to the battery cell, comprising a body and a telescopic portion connected to the body, the telescopic portion being capable of stretching and deforming along the length direction of the body, and protruding from the body along the thickness direction of the body; and A sleeve, which is fitted over the telescopic part.

2. The battery device according to claim 1, wherein, The sleeve includes a first pipe and a second pipe detachably connected to the first pipe. The first pipe and the second pipe together form a sleeve space, and the telescopic part is accommodated within the sleeve space.

3. The battery device according to claim 2, wherein, The first pipe and the second pipe are fastened together.

4. The battery device according to claim 3, wherein, The first pipe includes a first enclosure wall and a first locking wall connected to the first enclosure wall. The second pipe includes a second enclosure wall and a second locking wall connected to the second enclosure wall. The first locking wall and the second locking wall are locked together. The first enclosure wall, the first locking wall, the second enclosure wall and the second locking wall together form the sleeve space.

5. The battery device according to claim 4, wherein, The first locking wall includes a first connecting arm and a first hook. The first connecting arm is connected to the first enclosure wall, and the first hook is formed at the end of the first connecting arm away from the first enclosure wall. The second locking wall includes a second connecting arm and a second hook. The second connecting arm is connected to the second enclosure wall, and the second hook is formed at the end of the second connecting arm away from the second enclosure wall. The first hook and the second hook engage.

6. The battery device according to claim 4 or 5, wherein, The first enclosure includes a first barrier portion and a first connecting portion connected to the first barrier portion, the first barrier portion arching outward from the first connecting portion in a direction away from the second enclosure; and / or, The second enclosure includes a second enclosure portion and a second connecting portion connected to the second enclosure portion, the second enclosure portion arching out from the second connecting portion in a direction away from the first enclosure.

7. The battery device according to any one of claims 1-6, wherein, The telescopic part is corrugated along the length of the body.

8. The battery device according to any one of claims 1-7, wherein, The sleeve abuts against the battery cell.

9. The battery device according to any one of claims 1-8, wherein, The battery device includes electrical components, and the flexible circuit board includes an end connected to the telescopic part. The end is located on the side of the telescopic part away from the main body, and the end is provided with a connector that is plugged into the electrical components.

10. An electrical appliance, wherein, The electrical equipment includes the battery device according to any one of claims 1-9.

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