Battery cell assembly, battery, and electric device

Abstract

A battery cell assembly (10b), a battery (10) and an electric device. The battery cell assembly (10b) comprises a bare battery cell (200), a top cover (300) and an insulating film (400), wherein the top cover (300) is disposed at an end of the bare battery cell (200); the insulating film (400) covers the outer peripheral surface of the bare battery cell (200), with part of the top cover (300) covered within the insulating film (400); one of an inner wall of the insulating film (400) and an outer peripheral wall of the top cover (300) is provided with protrusions (410), and the other is provided with fastening recesses (322); and by means of the protrusions (410) and the fastening recesses (322), the insulating film (400) and the top cover (300) are fastened together to form a supporting frame. The battery cell assembly (10b) provides relatively high assembly efficiency and allows for easy insertion into a housing, whilst preventing the insulating film (400) from easily wrinkling during insertion into the housing.

Description

Battery cell components, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese utility model patent application filed with the China Patent Office on November 24, 2023, with application number 202323190689.2. The entire contents of the patent application are incorporated into this application by reference. Technical Field

[0003] The present application relates to the field of new energy technology, and in particular to a battery cell assembly, a battery, and an electrical device. Background Art

[0004] In the related art, a battery generally includes a shell and a cell assembly, and the cell assembly includes a bare cell, a top cover provided at the end of the bare cell, and an insulating film coated on the bare cell. When assembling the battery, the assembled cell assembly is loaded into the shell from the opening of the shell, and the top cover is made to close the opening of the shell, wherein the main function of the insulating film is to achieve insulation separation between the bare cell and the shell. In order to facilitate the loading of the cell assembly into the shell, the related art chooses to respectively set side strips on both sides of the direction of inserting the cell assembly into the shell, wherein the side strips and the insulating film are fixed by hot melting, and then the cell assembly is loaded into the shell from the opening of the shell. This method has the problem of many assembly steps, resulting in low assembly efficiency, and it is easy to have problems with the cell assembly being difficult to put into the shell and the insulating film being easy to wrinkle. In particular, when the battery is a long-core battery, the cell assembly is difficult to put into the shell, and the problem of the cell assembly being too long and easy to wrinkle when pushed into the shell from one side is more obvious.

[0005] Summary of the Invention

[0006] Based on this, it is necessary to provide a battery cell assembly, battery and electrical device that have high assembly efficiency, are easy to insert into the shell and are not prone to wrinkling of the insulating film during the shell insertion process to address the above problems.

[0007] A battery cell assembly, comprising:

[0008] Bare battery cells;

[0009] a top cover, provided at the end of the bare cell; and

[0010] An insulating film is coated on the outer peripheral surface of the bare battery cell, and part of the top cover is coated inside the insulating film. One of the inner wall of the insulating film and the outer peripheral wall of the top cover has a protruding position, and the other has a buckling recessed position. The insulating film and the top cover are buckled and connected by the protruding position and the buckling recessed position to form a support frame.

[0011] In some embodiments, the thickness of the insulating film is 0.2 mm to 0.8 mm; and / or

[0012] The insulating film is made of PC, PVC or PP; and / or

[0013] The insulating film has the protruding portion, and the outer peripheral wall of the insulating film has a recessed portion in a region corresponding to the protruding portion; and / or

[0014] There are multiple protrusions or multiple buckling recesses on the insulating film, and the multiple protrusions or multiple buckling recesses on the insulating film are arranged at intervals along the circumference of the bare battery cell; and / or

[0015] The top cover includes a top cover sheet and an insulating member provided on a side of the top cover sheet close to the bare battery cell. At least a portion of the insulating member is covered in the insulating film, and the insulating member has the protruding position or the buckling recessed position.

[0016] In some embodiments, the insulating member is a lower plastic member of the top cover.

[0017] In some embodiments, the bare battery cell has a large surface, and the insulating film and each large surface are provided with the protruding position or the buckling recessed position correspondingly.

[0018] In some embodiments, in the insulating film, the protruding portions or the engaging recessed portions corresponding to different large surfaces are arranged opposite to each other; and / or

[0019] In the insulating film, the sizes of the protruding portions or the buckling recessed portions corresponding to different large surfaces are different.

[0020] In some embodiments, the bare battery cell has two large surfaces, the inner wall of the insulating film has a protrusion, and in the inner wall of the insulating film, the length of the protrusion corresponding to one of the large surfaces of the insulating film is greater than the length of the protrusion corresponding to the other large surface of the insulating film.

[0021] In some embodiments, the insulating film surrounds the bare cell in the circumferential direction of the outer wall of the bare cell, and the head and tail ends of the insulating film are connected.

[0022] In some embodiments, one end of the insulating film has a groove, and the other end has a bump. The end surfaces of the insulating film face each other, and the bump is stuck in the groove.

[0023] In some embodiments, the end portions of the insulating film are connected to the large surface of the bare cell; and / or

[0024] There are multiple grooves and multiple bumps, and the multiple grooves and the multiple bumps are arranged at intervals along the length direction of the bare battery cell; and / or

[0025] The inner wall of the groove has a first inner side wall, a groove bottom and a second inner side wall connected in sequence, the angle between the first inner side wall and the groove bottom is 15°-75°, and the angle between the second inner side wall and the groove bottom is 15°-75°.

[0026] In some embodiments, the angle formed between the first inner sidewall and the groove bottom is the same as the angle formed between the second inner sidewall and the groove bottom.

[0027] A battery comprising:

[0028] The shell is a hollow structure with an opening;

[0029] In the battery cell assembly as described in any one of the above embodiments, the battery cell assembly is arranged in the shell, and the top cover closes the opening of the shell.

[0030] In some embodiments, both ends of the shell have openings, and the battery cell assembly has two top covers, which are respectively provided at the two ends of the bare battery cell and respectively close the two openings of the shell;

[0031] Wherein, the two ends of the insulating film respectively cover parts of the two top covers, and the two ends of the insulating film are buckled and connected with the two top covers through the protruding positions and the buckling recessed positions.

[0032] An electrical device includes the battery described in the above embodiment.

[0033] In the above-mentioned battery cell assembly, battery, and electrical device, since part of the top cover is enclosed within the insulating film, one of the inner wall of the insulating film and the outer peripheral wall of the top cover has a raised portion, and the other has a snap-fitting recessed portion. The insulating film and the top cover are snap-fitted together via the raised portion and the snap-fitting recessed portion to form a support frame, thereby facilitating the installation of the above-mentioned battery cell assembly into the housing. Furthermore, the problem of the insulating film wrinkling is less likely to occur during the installation of the above-mentioned battery cell assembly into the housing. Furthermore, the insulating film and the top cover are snap-fitted together via the raised portion and the snap-fitting recessed portion. Compared to the traditional method of hot-melt-fixing side strips on both sides of the insulating film, the hot-melt fixing step can be omitted, resulting in relatively fewer transfer steps and thus improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] FIG1 is a schematic structural diagram of a battery in one embodiment of the present invention;

[0036] FIG2 is an exploded view of the battery cell assembly in FIG1 ;

[0037] FIG3 is a schematic structural diagram of the battery cell assembly in FIG1 from one perspective;

[0038] FIG4 is a schematic structural diagram of the battery cell assembly in FIG1 from another perspective;

[0039] FIG5 is an exploded view of the insulating film and the top cover of the battery cell assembly in FIG1 ;

[0040] FIG6 is a cross-sectional view of the insulation film and the top cover of the battery cell assembly in FIG1 ;

[0041] FIG7 is a schematic structural diagram of the insulating film of the battery cell assembly in FIG1 ;

[0042] FIG8 is a partial enlarged view of point A in FIG7 . DETAILED DESCRIPTION

[0043] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0046] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0047] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0049] As shown in FIG1 , a battery 10 in a preferred embodiment of the present invention includes a housing 10a and a cell assembly 10b. The housing 10a has an opening. The cell assembly 10b is assembled into the housing 10a through the opening.

[0050] In this embodiment, as shown in Figures 2 to 6, the battery cell assembly 10b includes a bare battery cell 200, a top cover 300 and an insulating film 400. The top cover 300 is provided at the end of the bare battery cell 200. When the battery cell assembly 10b is provided in the shell 10a, the top cover 300 closes the opening of the shell 10a. The insulating film 400 is coated on the outer peripheral surface of the bare battery cell 200, and part of the top cover 300 is coated in the insulating film 400. One of the inner wall of the insulating film 400 and the outer peripheral wall of the top cover 300 has a protruding position 410, and the other has a buckling recessed position 322. The insulating film 400 and the top cover 300 are buckled together by the protruding position 410 and the buckling recessed position 322 to form a support frame.

[0051] In the battery cell assembly 10b, since part of the top cover 300 is enclosed within the insulating film 400, one of the inner wall of the insulating film 400 and the outer wall of the top cover 300 has a protrusion 410 and the other has a snap-fitting recess 322. The insulating film 400 and the top cover 300 are snap-fitted together by the protrusion 410 and the snap-fitting recess 322 to form a support frame, making it easy to install the battery cell assembly 10b into the housing 10a. Furthermore, the problem of the insulating film 400 wrinkling is less likely to occur during the installation of the battery cell assembly 10b into the housing 10a. Furthermore, the insulating film 400 and the top cover 300 are snap-fitted together by the protrusion 410 and the snap-fitting recess 322. Compared to the conventional method of hot-melt-fixing the side strips on both sides of the insulating film 400, the hot-melt fixing step can be omitted, resulting in relatively fewer assembly steps and improved assembly efficiency.

[0052] In the present embodiment, the top cover 300 includes a top cover sheet 310 and an insulating member 320 provided on the side of the top cover sheet 310 close to the bare cell 200. At least a portion of the insulating member 320 is enclosed in the insulating film 400. The outer peripheral wall of the insulating member 320 has a protruding position 410 or a snap-fitting recessed position 322. In this way, it is very convenient to set the protruding position 410 or the snap-fitting recessed position 322 on the outer peripheral wall of the top cover 300. Specifically, in the present embodiment, the insulating member 320 is the lower plastic part of the top cover 300. It can be understood that in other embodiments, the insulating film 400 can also be connected to other elements of the top cover 300 that can be enclosed in the insulating film 400.

[0053] In this embodiment, the inner wall of the insulating film 400 has multiple raised portions 410 or multiple snap-fitting recesses 322, and these are arranged at intervals along the circumference of the bare cell 200. This facilitates a secure connection between the insulating film 400 and the top cover 300. Specifically, in this embodiment, the inner wall of the insulating film 400 has four raised portions 410 or four snap-fitting recesses 322.

[0054] In the present embodiment, the raised position 410 or the snap-fit ​​recessed position 322 on the inner wall of the insulating film 400 is provided corresponding to the large surface 200a of the bare cell 200. In this way, it is very convenient to provide the raised position 410 or the snap-fit ​​recessed position 322 on the inner wall of the insulating film 400. It should be noted that the outer peripheral wall of the bare cell 200 has multiple side surfaces, among which the surface with the largest area is the large surface, and the other surfaces are small surfaces. Specifically, in the present embodiment, the bare cell 200 is square, and the bare cell 200 has two large surfaces and two small surfaces. It can be understood that in other embodiments, the raised position 410 or the snap-fit ​​recessed position 322 on the inner wall of the insulating film 400 can also be provided corresponding to the small surface of the bare cell 200.

[0055] In this embodiment, the inner wall of the insulating film 400 and each large surface 200a are provided with a protrusion 410 or a buckling recess 322. Thus, the inner wall of the insulating film 400 has at least two protrusions 410 or two buckling recesses 322, thereby facilitating a secure connection between the insulating film 400 and the top cover 300.

[0056] Specifically, in this embodiment, the protrusions 410 or the engaging recesses 322 corresponding to the different large surfaces 200a are arranged on the inner wall of the insulating film 400. This facilitates a more secure connection between the insulating film 400 and the top cover 300.

[0057] Specifically, in this embodiment, the sizes of the protrusions 410 or the engaging recesses 322 corresponding to the different large surfaces 200a on the inner wall of the insulating film 400 are different, which is conducive to a more secure connection between the insulating film 400 and the top cover 300.

[0058] Specifically, the bare cell 200 has two large surfaces 200a, and the inner wall of the insulating film 400 has a protrusion 410. In the inner wall of the insulating film 400, the length of the protrusion 410 corresponding to the insulating film 400 and one of the large surfaces 200a is greater than the length of the protrusion 410 corresponding to the insulating film 400 and the other large surface 200a.

[0059] More specifically, in this embodiment, as shown in Figure 5, the inner wall of the insulating film 400 has a protrusion 410, and the outer peripheral wall of the top cover 300 has a snap-fit ​​recess 322. In the inner wall of the insulating film 300, the length of the protrusion 410 corresponding to the large surface 200a on the front side is greater than the length of the protrusion 410 corresponding to the large surface 200a on the rear side.

[0060] In this embodiment, as shown in FIG6 , the inner wall of the insulating film 400 has a raised portion 410, while the outer wall of the top cover 300 has a snap-fitting recessed portion 322. The outer wall of the insulating film 400 has a recessed portion 410a in the area corresponding to the raised portion 410. This makes it very convenient to provide the raised portion 410 on the inner wall of the insulating film 400. For example, the outer wall of the insulating film 400 can be punched to form the recessed portion 410a on the outer wall of the insulating film 400 while forming the raised portion 410 on the inner wall of the insulating film 400.

[0061] In this embodiment, the thickness of the insulating film 400 is 0.2 mm to 0.8 mm. Using a relatively thick insulating film 400 to connect with the top cover 300 and form a support frame can provide the support frame with greater support strength, making it easier to install the battery cell assembly 10 b into the housing 10 a. Furthermore, during the installation process, the insulating film 400 is less likely to wrinkle.

[0062] In this embodiment, the insulating film 400 is made of PC (Polycarbonate), PVC (Polyvinyl chloride) or PP (Polypropylene).

[0063] In this embodiment, as shown in Figures 7 and 8, the insulating film 400 surrounds the bare cell 200 in the circumferential direction of the outer wall of the bare cell 200, and the head and tail ends of the insulating film 400 are connected. In this way, it is very convenient to set the insulating film 400 on the bare cell 200 to effectively insulate and separate the bare cell 200 from the shell 10a. Specifically, the head end of the flat insulating film 400 can be positioned at a certain position on the outer wall of the bare cell 200, and then the insulating film 400 can be bent along the circumference of the bare cell 200 to cover the bare cell 200, and finally the head and tail ends of the insulating film 400 are connected.

[0064] In this embodiment, the ends of the insulating film 400 are connected at the large surface 200a of the bare cell 200. This makes it very easy to connect the ends of the insulating film 400. It is understood that in other embodiments, the ends of the insulating film 400 can also be connected at the small surface of the bare cell 200.

[0065] In this embodiment, one end of the insulating film 400 has a groove 420, and the other end has a protrusion 430. The end surfaces of the insulating film 400 face each other, and the protrusion 430 is retained within the groove 420. This facilitates the connection of the ends of the insulating film 400. Furthermore, the facing end surfaces of the insulating film 400 make it easier to install the battery cell assembly 10b into the housing 10a than when the insulating film 400 is stacked end to end. It is understood that in other embodiments, the end surfaces of the insulating film 400 can also be bonded together using an adhesive.

[0066] In this embodiment, there are multiple grooves 420 and multiple bumps 430, and the multiple grooves 420 and multiple bumps 430 are arranged at intervals along the length direction of the bare cell 200. In this way, the end and end of the insulating film 400 can be firmly connected.

[0067] In this embodiment, the inner wall of the groove 420 includes a first inner sidewall 422, a groove bottom 424, and a second inner sidewall 426, which are connected in sequence. The angle between the first inner sidewall 422 and the groove bottom 424 is 15°-75°, and the angle between the second inner sidewall 426 and the groove bottom 424 is 15°-75°. This ensures that the ends of the insulating film 400 are securely connected. Specifically, in this embodiment, the angle between the first inner sidewall 422 and the groove bottom 424 and the angle between the second inner sidewall 426 and the groove bottom 424 are the same. It will be appreciated that in other embodiments, the angle between the first inner sidewall 422 and the groove bottom 424 and the angle between the second inner sidewall 426 and the groove bottom 424 may also be different.

[0068] In this embodiment, as shown in Figures 1 and 2, the battery 10 is a long-cell battery. The shell 10a is a hollow structure with openings at both ends, that is, both ends of the shell 10a have openings. The battery cell assembly 10b has two top covers 300, which are respectively arranged at the two ends of the bare battery cell 200, and the two top covers 300 respectively close the two openings of the shell 10a. In this way, when assembling the above-mentioned battery 10, the bare battery cell 200, the insulating film 400 and a top cover 300 of the battery cell assembly 10b are first assembled, and then the end of the bare battery cell 200 away from the top cover 300 is inserted into the shell 10a from one opening of the shell 10a, and finally the other top cover 300 of the battery cell assembly 10b is assembled at the other opening of the shell 10a. It can be understood that in other embodiments, the shell 10a can also be a hollow structure with one end open and the other end closed, that is, the shell 10a has only one opening, and the corresponding battery cell assembly 10b also has only one top cover 300.

[0069] In this embodiment, the ends of the insulating film 400 respectively cover portions of the two top covers 300. Both ends of the insulating film 400 and the two top covers 300 are fastened together via raised portions 410 and recessed fastening portions 322. In this way, the insulating film 400 and the two top covers 300 form a more stable support frame. It is understood that in other embodiments, one top cover 300 may be connected to the insulating film 400, while the other top cover 300 is not.

[0070] This embodiment further provides an electrical device, which includes the battery mentioned above and can provide electrical energy for the electrical device.

[0071] Among them, the above-mentioned electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell assembly, characterized in that: include: Bare battery cells; A top cover, arranged at the end of the bare battery cell; as well as An insulating film is coated on the outer peripheral surface of the bare battery cell, and part of the top cover is coated in the insulating film. One of the inner wall of the insulating film and the outer peripheral wall of the top cover has a protruding position, and the other has a buckling recessed position. The insulating film and the top cover are buckled and connected through the protruding position and the buckling recessed position to form a support frame.

2. The battery cell assembly according to claim 1, characterized in that: The thickness of the insulating film is 0.2 mm to 0.8 mm; and / or The insulating film is made of PC, PVC or PP; and / or The insulating film has the protruding portion, and the peripheral wall of the insulating film has a recessed portion in a region corresponding to the protruding portion; and / or There are multiple protrusions or multiple buckling recesses on the insulating film, and the multiple protrusions or multiple buckling recesses on the insulating film are arranged at intervals along the circumference of the bare battery cell; and / or The top cover comprises a top cover sheet and an insulating member arranged on a side of the top cover sheet close to the bare battery cell, at least a portion of the insulating member is wrapped in the insulating film, and the insulating member has the protruding position or the buckling recessed position.

3. The battery cell assembly according to claim 2, characterized in that: The insulating member is a lower plastic member of the top cover.

4. The battery cell assembly according to claim 1, characterized in that: The bare battery cell has a large surface, and the insulating film and each large surface are provided with the protruding position or the buckling recessed position correspondingly.

5. The battery cell assembly according to claim 4, characterized in that: In the insulating film, the protruding positions or the buckling recessed positions corresponding to different large surfaces are arranged opposite to each other; and / or In the insulating film, the sizes of the protruding positions or the buckling recessed positions arranged corresponding to different large surfaces are different.

6. The battery cell assembly according to claim 5, characterized in that: The bare battery cell has two large surfaces, and the inner wall of the insulating film has a protrusion. In the inner wall of the insulating film, the length of the protrusion corresponding to one of the large surfaces of the insulating film is greater than the length of the protrusion corresponding to the other large surface of the insulating film.

7. The battery cell assembly according to claim 1, characterized in that: In the circumferential direction of the outer peripheral wall of the bare battery core, the insulating film surrounds the bare battery core, and the head and tail ends of the insulating film are connected.

8. The battery cell assembly according to claim 7, characterized in that: One end of the insulating film has a groove, and the other end has a convex block. The end surfaces of the insulating film at the two ends face each other, and the convex block is stuck in the groove.

9. The battery cell assembly according to claim 8, characterized in that: The ends of the insulating film are connected to the large surface of the bare battery core; and / or There are multiple grooves and multiple protrusions, and the multiple grooves and multiple protrusions are arranged at intervals along the length direction of the bare battery cell; and / or The inner wall of the groove comprises a first inner side wall, a groove bottom and a second inner side wall connected in sequence, wherein the angle between the first inner side wall and the groove bottom is 15°-75°, and the angle between the second inner side wall and the groove bottom is 15°-75°.

10. The battery cell assembly according to claim 9, characterized in that: The angle between the first inner side wall and the groove bottom is the same as the angle between the second inner side wall and the groove bottom.

11. A battery, characterized in that: include: The shell is a hollow structure with an opening; The battery cell assembly according to any one of claims 1 to 10, wherein the battery cell assembly is arranged in the housing The top cover closes the opening of the shell.

12. The battery according to claim 11, characterized in that Both ends of the shell have openings, and the battery cell assembly has two top covers, which are respectively arranged at the two ends of the bare battery cell and respectively close the two openings of the shell; Wherein, the two ends of the insulating film respectively cover parts of the two top covers, and the two ends of the insulating film are buckled and connected with the two top covers through the protruding positions and the buckling recessed positions.

13. An electrical device, characterized in that: Comprising a battery as claimed in claim 11 or 12.

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