A single cell and a battery pack

Abstract

The application provides a single battery and a battery pack, and belongs to the technical field of batteries. The single battery comprises a shell, an electrode assembly, a top cover, a first bending part, an insulating film and an insulating part; the electrode assembly is located in the shell; the top cover comprises a thinning part and the first bending part, the thinning part is connected with the shell; the first bending part is connected with one side of the thinning part close to the electrode assembly, the first bending part extends towards the direction close to the electrode assembly, and a first accommodation hole penetrating in a second direction is arranged on the first bending part; the insulating film is arranged outside the electrode assembly; the insulating part is located in the shell, and one side of the insulating part close to the electrode assembly is connected with the thinning part; the insulating part has a first protruding part, the first protruding part is arranged in the first accommodation hole, and one end of the insulating film close to the thinning part is fixedly connected with the first protruding part. The thickness of the thinning part is reduced, the weight of the top cover is reduced, the material consumption of the top cover is reduced, the energy density of the single battery is improved, and the stability and safety of the electrode assembly are ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] In the field of power batteries, ensuring the manufacturability and safety and reliability of batteries is of paramount importance to battery manufacturers, with battery stability being particularly crucial.

[0003] To improve energy density, existing power battery cells have a flanged edge on the top cover. Since the flanged edge surrounds the outer periphery of the lower plastic, it increases the difficulty of connecting the lower plastic and the insulating film, affecting the sealing and insulation quality. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] This application provides the following technical solution: a single-cell battery having a second orientation, comprising: case; The electrode assembly is located within the housing; The top cover includes a thinned portion and a first bent portion. The thinned portion is connected to the housing. The first bent portion is located inside the housing. The first bent portion is connected to the side of the thinned portion near the electrode assembly. The first bent portion extends in a direction close to the electrode assembly. The first bent portion is provided with a first clearance hole that passes through along the second direction. An insulating film is located inside the housing and covers the electrode assembly. An insulating element is located inside the housing and is connected to the side of the thinned portion facing the electrode assembly. The insulating element has a first protrusion that protrudes along the second direction. The first protrusion passes through the first clearance hole and is fixedly connected to one end of the insulating film near the thinned portion.

[0006] In some embodiments, the single cell further has a first direction and a third direction that are mutually perpendicular to the second direction; the top cover further includes a second bending portion, the second bending portion being located at the end of the thinned portion along the third direction, and the second bending portion having a second clearance hole penetrating along the third direction; The insulating member has a second protrusion that protrudes in the third direction, passes through the second clearance hole, and is fixedly connected to one end of the insulating film near the thinning portion.

[0007] In some embodiments, the first clearance hole extends through the end of the first bend near the electrode assembly along the first direction; And / or, the second clearance hole extends along the first direction through the end of the first bend near the electrode assembly.

[0008] In some embodiments, the first clearance hole extends along the third direction, the first protrusion extends along the third direction, and the sidewall of the first protrusion abuts against the inner wall of the first clearance hole. And / or, the second clearance hole extends along the second direction, the second protrusion extends along the second direction, and the sidewall of the second protrusion abuts against the inner wall of the second clearance hole.

[0009] In some embodiments, the end of the first protrusion facing the inner wall of the housing protrudes from the first clearance hole and is fixedly connected to the insulating film; And / or the end of the second protrusion facing the inner wall of the housing protrudes out of the second clearance hole and is fixedly connected to the insulating film.

[0010] In some embodiments, the second bend is provided with a plurality of second clearance holes, and the plurality of second clearance holes are arranged at intervals along the second direction; The insulating member has a plurality of second protrusions, one of which is correspondingly disposed in one of the second clearance holes.

[0011] In some embodiments, along the third direction, the side of the second bend away from the inner wall of the housing abuts against the side wall of the insulating member.

[0012] In some embodiments, the first bend is provided with a plurality of first clearance holes, and the plurality of first clearance holes are arranged at intervals along the third direction; The insulating member has a plurality of first protrusions, and one first protrusion is correspondingly disposed in one first clearance hole.

[0013] In some embodiments, along the second direction, the side of the first bend away from the inner wall of the housing abuts against the side wall of the insulating member.

[0014] Secondly, some embodiments of this application provide a battery pack including the aforementioned single battery cell.

[0015] The embodiments of this application have the following advantages: By reducing the thickness of the thinned portion of the top cover, this application can not only reduce the weight of the thinned portion, but also reduce the amount of material used in the thinned portion, thereby reducing the weight of the top cover. While improving the energy density of the single battery cell, it can also reduce the production cost of the top cover. By fixing the first protrusion to the insulating film, an insulating barrier structure is formed on the outer surface of the electrode assembly to prevent the electrode assembly from connecting to the housing or top cover, thus ensuring the stability of the electrode assembly and its safety within the housing.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 An exploded view of a first embodiment of a single-cell battery provided by some embodiments of this application is shown; Figure 2 This paper shows a schematic diagram of the structure of a first embodiment of a single-cell battery provided by some embodiments of this application; Figure 3 It shows Figure 2 Sectional view of section AA; Figure 4 This invention provides a schematic diagram of the structure of a single-cell battery in a first embodiment, showing the connection between the top cover and the insulating component from one perspective. Figure 5 It shows Figure 4 Sectional view of the middle BB section; Figure 6 This invention provides a schematic diagram of the top cover from one perspective in a first embodiment of a single-cell battery according to some embodiments of the present application. Figure 7 This invention provides a schematic structural diagram of the insulating member connection in a first embodiment of a single-cell battery according to some embodiments of the present application. Figure 8 This application shows another structural schematic diagram of the top cover in a first embodiment of a single-cell battery provided by some embodiments; Figure 9This application shows another structural schematic diagram of an insulating component in a first embodiment of a single-cell battery provided by some embodiments; Figure 10 An exploded view of a second embodiment of a single-cell battery provided by some embodiments of this application is shown; Figure 11 This illustration shows a schematic structural diagram from one perspective of a second embodiment of a single-cell battery provided by some embodiments of this application; Figure 12 It shows Figure 11 A sectional view of the central CC section; Figure 13 This invention provides a schematic diagram of the connection between the top cover and the insulating component in a second embodiment of a single-cell battery according to some embodiments of this application. Figure 14 It shows Figure 13 Sectional view of the middle DD section; Figure 15 This invention provides a schematic diagram of the top cover from one perspective in a second embodiment of a single-cell battery according to some embodiments of the present application. Figure 16 This invention provides a schematic structural diagram of the insulating connection in a second embodiment of a single-cell battery according to some embodiments of the present application. Figure 17 An exploded view of a third embodiment of a single-cell battery provided in some embodiments of this application is shown; Figure 18 This illustration shows a schematic structural diagram from one perspective of a third embodiment of a single-cell battery provided by some embodiments of this application; Figure 19 It shows Figure 18 Sectional view of the middle EE section; Figure 20 This illustration shows a structural schematic diagram from one perspective of the connection between the top cover and the insulating component in a third embodiment of a single-cell battery provided by some embodiments of this application; Figure 21 It shows Figure 20 Sectional view of the middle FF section; Figure 22 The diagram shows a structural schematic of the top cover in a third embodiment of a single-cell battery provided by some embodiments of this application from one perspective. Figure 23 This illustration shows a schematic diagram of the insulating connection in a third embodiment of a single-cell battery provided by some embodiments of this application; Figure 24 An exploded view of a fourth embodiment of a single-cell battery provided in some embodiments of this application is shown; Figure 25 A schematic diagram of a fourth embodiment of a single-cell battery provided by some embodiments of this application is shown from one perspective. Figure 26 It shows Figure 25 A sectional view of the middle GG section; Figure 27 This illustration shows a schematic diagram from one perspective of the connection between the top cover and the insulating component in a fourth embodiment of a single-cell battery provided by some embodiments of this application; Figure 28 It shows Figure 27 A cross-sectional view of the middle HH section; Figure 29 The diagram shows a structural schematic of the top cover in a fourth embodiment of a single-cell battery provided by some embodiments of this application from one perspective. Figure 30 The diagram shows a structural schematic from one perspective of the connection of insulating elements in a fourth embodiment of a single-cell battery provided by some embodiments of this application.

[0019] Explanation of key component symbols: 100-Housing shell; 200-Top cover; 210-Thinning portion; 220-First bending portion; 221-First clearance hole; 230-Second bending portion; 231-Second clearance hole; 300-Insulating film; 400-Insulating component; 410-First protrusion; 420-Second protrusion; 500-Electrode assembly.

[0020] X - First direction; Z - Second direction; Y - Third direction. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] 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 belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figures 1 to 9 As shown, this application provides a single-cell battery with a second direction Z. The energy density of the single-cell battery is improved by increasing the effective utilization space inside the casing 100 through the thinning design of the top cover 200.

[0027] The single cell includes a casing 100, an electrode assembly 500, a thinning portion 210, a first bending portion 220, an insulating film 300, and an insulating component 400.

[0028] The electrode assembly 500 is located inside the housing 100, so that the housing 100 can limit and protect the electrode assembly 500, and ensure the stability of the electrode assembly 500 within the housing 100.

[0029] The thinned part 210 is connected to the housing 100. The connection method between the two includes at least one of snap-fit, adhesive, hot-melt connection, interference fit, and tenon and mortise connection, which can be specifically set according to the actual situation.

[0030] In this embodiment, the top cover 200 includes a thinned portion 210 and a first bending portion 220. The first bending portion 220 is disposed on the side of the thinned portion 210 facing the electrode assembly 500, and is disposed along the edge of the thinned portion 210, connecting the thinned portion 210 to the housing 100. Optionally, the connection method between the first bending portion 220 and the thinned portion 210 includes any one of snap-fit, bonding, heat fusion connection, or integral molding, which can be specifically set according to the actual situation.

[0031] In this embodiment, the thinning portion 210 is thinner than the thickness of the top cover in the prior art. Thinning means that the thickness of the top cover 200 is reduced in the first direction X, that is, the thickness of the top cover 200 is reduced. It should be noted that the reduction of the thickness of the top cover 200 mentioned here includes reducing the thickness of the thinning portion 210 locally along the first direction X or reducing the overall thickness of the thinning portion 210 along the first direction X.

[0032] The first bending portion 220 is located inside the housing 100. The first bending portion 220 is connected to the side of the thinning portion 210 near the electrode assembly 500. The first bending portion 220 is located at the edge of the thinning portion 210. The first bending portion 220 extends in the direction close to the electrode assembly 500. The first bending portion 220 is provided with a first clearance hole 221 that passes through along the second direction Z. The number of first clearance holes 221 can be one, two or more, and can be specifically set according to the actual situation.

[0033] It should be noted that the first bending portion 220 and the thinning portion 210 can be integrally formed.

[0034] The insulating film 300 is located inside the housing 100 and covers the electrode assembly 500 to insulate and separate the electrode assembly 500 from the inner wall of the housing 100, so as to prevent the electrode assembly 500 from directly contacting the housing 100 and causing a short circuit.

[0035] The insulating member 400 is located inside the housing 100, and the insulating member 400 is connected to the side of the thinning portion 210 facing the electrode assembly 500. It can be understood that the insulating member 400 is located between the thinning portion 210 and the electrode assembly 500.

[0036] In this embodiment, the insulating member 400 has a first protrusion 410, which protrudes along the second direction Z. The first protrusion 410 passes through the first clearance hole 221 and is fixedly connected to one end of the insulating film 300 near the thinning portion 210. The insulating member 400 and the insulating film 300 are connected to form an insulating barrier structure on the outer surface of the electrode assembly 500 to prevent the electrode assembly 500 from connecting with the housing 100 or the thinning portion 210, thereby ensuring the stability of the electrode assembly 500 and its safety within the housing 100.

[0037] It should be noted that the connection between the first protrusion 410 and the insulating film 300 includes at least adhesive bonding or thermal fusion bonding.

[0038] It is understood that the number of first protrusions 410 is equal to the number of first clearance holes 221, and one first protrusion 410 is correspondingly inserted into one first clearance hole 221. The sidewall of the first protrusion 410 is connected to the inner wall of the first clearance hole 221 to form a limiting connection structure to ensure the stability of the connection between the first protrusion 410 and the hole wall of the first clearance hole 221.

[0039] This application reduces the thickness of the top cover 200 at the thinning portion 210, thereby reducing the weight of the thinning portion 210 and the amount of material used, thus reducing the weight of the top cover 200. This increases the energy density of the single battery cell while also reducing the production cost of the top cover 200. By fixing the first protrusion 410 to the insulating film 300, an insulating barrier structure is formed on the outer surface of the electrode assembly 500 to prevent the electrode assembly 500 from connecting to the housing 100 or the thinning portion 210, ensuring the stability of the electrode assembly 500 and its safety within the housing 100.

[0040] like Figure 2 As shown, in some embodiments of this application, the single cell also has a first direction X and a third direction Y that are mutually perpendicular to the second direction Z.

[0041] The top cover 200 further includes a second bending portion 230, which is located at the end of the thinning portion 210 along the third direction Y. That is, the thinning portion 210 has a second bending portion 230 at both ends along the third direction Y. It should be noted that the second bending portion 230 and the thinning portion 210 can be integrally formed.

[0042] In addition, the second bending portion 230 is provided with a second clearance hole 231 that passes through the third direction Y. The number of the first clearance holes 221 can be one, two or more, and can be specifically set according to the actual situation.

[0043] In addition, the insulating member 400 has a second protrusion 420, which protrudes along the third direction Y. The second protrusion 420 passes through the second clearance hole 231 and is fixedly connected to one end of the insulating film 300 near the thinning portion 210, so as to further improve the stability of the connection between the insulating member 400 and the insulating film 300, and at the same time ensure the stability of the connection between the insulating member 400 and the thinning portion 210.

[0044] In some embodiments, the sidewall of the second protrusion 420 is connected to the inner wall of the second relief hole 231 to prevent the second protrusion 420 from shaking in the second relief hole 231, thereby ensuring the stability of the connection between the insulating member 400 and the top cover 200.

[0045] It should be noted that the connection between the second protrusion 420 and the insulating film 300 includes at least adhesive bonding or thermal fusion bonding.

[0046] like Figures 10 to 23 As shown, in some embodiments of this application, the first clearance hole 221 penetrates the end of the first bend 220 near the electrode assembly 500 along the first direction X, so as to form a first notch on the side of the first bend 220 near the electrode assembly 500. By setting the first notch, the convenience and efficiency of assembly between the first protrusion 410 and the first clearance hole 221 are further improved.

[0047] In some embodiments, the second clearance hole 231 penetrates the end of the first bend 220 near the electrode assembly 500 along the first direction X to form a second notch on the side of the first bend 220 near the electrode assembly 500. By setting the second notch, the convenience and efficiency of assembling the second protrusion 420 and the second clearance hole 231 are further improved, thereby improving the convenience and efficiency of assembling the insulating member 400 and the top cover 200.

[0048] like Figures 24 to 30 As shown, in some embodiments of this application, the first clearance hole 221 extends along the third direction Y, and the first protrusion 410 extends along the third direction Y, that is, the length of the first protrusion 410 along the third direction Y is increased.

[0049] The sidewall of the first protrusion 410 abuts against the inner wall of the first clearance hole 221 to form a limiting connection structure, thereby ensuring the stability of the first protrusion 410 within the first clearance hole 221. It is understood that the length of the first clearance hole 221 along the third direction Y is equal to the length of the first protrusion 410 along the third direction Y, to ensure the compactness and stability of the assembly between the first protrusion 410 and the inner wall of the first clearance hole 221.

[0050] In some embodiments, the second clearance hole 231 extends along the second direction Z, that is, it increases the length of the second protrusion 420 along the second direction Z.

[0051] Furthermore, the second protrusion 420 extends along the second direction Z, and its sidewall abuts against the inner wall of the second clearance hole 231 to form a limiting connection structure, thereby ensuring the stability of the second protrusion 420 within the second clearance hole 231. It is understood that the length of the second clearance hole 231 along the second direction Z is equal to the length of the second protrusion 420 along the second direction Z, ensuring the compactness and stability of the assembly between the second protrusion 420 and the inner wall of the second clearance hole 231. This ensures the stability and compactness of the connection between the insulating member 400 and the top cover 200, and the stability of the connection between the insulating member 400, the top cover 200, and the insulating film 300, thereby improving the insulation between the electrode assembly 500 and the housing 100 and ensuring the stability of the electrode assembly 500 within the housing 100.

[0052] like Figure 5 , Figure 14 , Figure 21 and Figure 28 As shown, in some embodiments of this application, the end of the first protrusion 410 facing the inner wall of the housing 100 protrudes from the first clearance hole 221, and the portion of the first protrusion 410 protruding from the first clearance hole 221 is fixedly connected to the insulating film 300 to ensure the convenience and stability of the connection between the first protrusion 410 and the insulating film 300.

[0053] In some embodiments, the end of the second protrusion 420 facing the inner wall of the housing 100 protrudes from the second clearance hole 231, and the portion of the second protrusion 420 protruding from the second clearance hole 231 is fixedly connected to the insulating film 300 to ensure the convenience and stability of the connection between the second protrusion 420 and the insulating film 300.

[0054] It is understandable that by having the first protrusion 410 protrude from the first clearance hole 221 and the second protrusion 420 protrude from the second clearance hole 231, a gap is formed between the insulating film 300 and the insulating component 400. This ensures the stability of the connection between the insulating film 300 and the insulating component 400 while avoiding direct contact between them. This reduces the difficulty of direct heat-fusion connection between the surfaces of the insulating film 300 and the insulating component 400, simplifies the connection method between them, and improves the efficiency of single-cell assembly and production.

[0055] like Figures 6 to 9 As shown, in some embodiments of this application, the second bending portion 230 is provided with a plurality of second clearance holes 231, and the plurality of second clearance holes 231 are arranged at intervals along the second direction Z. The distance between two adjacent second clearance holes 231 can be specifically set according to the actual situation.

[0056] The insulating member 400 has a plurality of second protrusions 420, and each second protrusion 420 is correspondingly disposed in a second clearance hole 231, that is, the number of second protrusions 420 is equal to the number of second clearance holes 231.

[0057] It should be noted that the shape of the second clearance hole 231 can be at least one of the following: circular, elliptical, polygonal, and cross-shaped. The shape of the second protrusion 420 is adapted to the second clearance hole 231, that is, the side wall of the second protrusion 420 fits against the inner wall of the second clearance hole 231 to ensure the stability of the connection between the insulating member 400 and the top cover 200.

[0058] like Figure 12 , Figure 14 and Figure 21 As shown, in some embodiments of this application, along the third direction Y, the side of the second bend 230 away from the inner wall of the housing 100 abuts against the side wall of the insulating member 400, so that the second bend 230 provided at the two ends of the top cover 200 along the third direction Y forms a limiting effect on the insulating member 400 along the third direction Y, so as to ensure the stability of the connection between the insulating member 400 and the top cover 200.

[0059] like Figure 8 , Figure 9 , Figure 22 and Figure 23 As shown, in some embodiments of this application, the first bending portion 220 is provided with a plurality of first clearance holes 221, and the plurality of first clearance holes 221 are arranged at intervals along the third direction Y. The distance between two adjacent first clearance holes 221 can be specifically set according to the actual situation.

[0060] The insulating member 400 has a plurality of first protrusions 410, and each first protrusion 410 is correspondingly disposed in a first clearance hole 221, that is, the number of first protrusions 410 is equal to the number of first clearance holes 221.

[0061] It should be noted that the shape of the first clearance hole 221 can be at least one of the following: circular, elliptical, polygonal, and cross-shaped. The shape of the first protrusion 410 is adapted to the first clearance hole 221, that is, the side wall of the first protrusion 410 fits against the inner wall of the first clearance hole 221, so as to ensure the stability of the connection between the insulating member 400 and the top cover 200.

[0062] like Figure 4 , Figure 13 , Figure 20 As shown, in some embodiments of this application, along the second direction Z, the side of the first bending portion 220 away from the inner wall of the housing 100 abuts against the side wall of the insulating member 400, so that the two first bending portions 220 provided on the thinning portion 210 form a limiting effect on the insulating member 400 along the second direction Z, so as to ensure the stability of the insulating member 400 inside the housing 100.

[0063] Secondly, this application provides a battery pack that includes the individual battery cells in any of the above embodiments.

[0064] It is understood that the battery pack has the beneficial effects of the individual cells in any of the above embodiments, which will not be elaborated here.

[0065] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0066] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A single-cell battery having a second orientation (Z), characterized in that, include: Casing (100); An electrode assembly (500) is located within the housing (100); The top cover (200) includes a thinning portion (210) and a first bending portion (220). The thinning portion (210) is connected to the housing (100). The first bending portion (220) is located inside the housing (100). The first bending portion (220) is connected to the side of the thinning portion (210) near the electrode assembly (500). The first bending portion (220) extends in a direction close to the electrode assembly (500). The first bending portion (220) is provided with a first clearance hole (221) that passes through along the second direction (Z). An insulating film (300) is located inside the housing (100) and covers the electrode assembly (500); An insulating member (400) is located inside the housing (100) and is connected to the side of the thinning portion (210) facing the electrode assembly (500). The insulating member (400) has a first protrusion (410) that protrudes along the second direction (Z). The first protrusion (410) passes through the first clearance hole (221) and is fixedly connected to the end of the insulating film (300) near the thinning portion (210).

2. The single-cell battery according to claim 1, characterized in that, The single cell also has a first direction (X) and a third direction (Y) that are mutually perpendicular to the second direction (Z); the top cover (200) also includes a second bending portion (230), the second bending portion (230) is located at the end of the thinned portion (210) along the third direction (Y), and the second bending portion (230) is provided with a second clearance hole (231) that passes through along the third direction (Y). The insulating member (400) has a second protrusion (420) that protrudes along the third direction (Y), the second protrusion (420) passes through the second clearance hole (231), and the second protrusion (420) is fixedly connected to one end of the insulating film (300) near the thinning portion (210).

3. The single-cell battery according to claim 2, characterized in that, The first clearance hole (221) passes through the first bend (220) near the end of the electrode assembly (500) along the first direction (X); And / or, the second clearance hole (231) extends along the first direction (X) through the first bend (220) near the end of the electrode assembly (500).

4. The single-cell battery according to claim 2, characterized in that, The first clearance hole (221) extends along the third direction (Y), the first protrusion (410) extends along the third direction (Y), and the sidewall of the first protrusion (410) abuts against the inner wall of the first clearance hole (221); And / or, the second clearance hole (231) extends along the second direction (Z), the second protrusion (420) extends along the second direction (Z), and the sidewall of the second protrusion (420) abuts against the inner wall of the second clearance hole (231).

5. The single-cell battery according to claim 2, characterized in that, The end of the first protrusion (410) facing the inner wall of the housing (100) protrudes out of the first clearance hole (221) and is fixedly connected to the insulating film (300); And / or, the end of the second protrusion (420) facing the inner wall of the housing (100) protrudes out of the second clearance hole (231) and is fixedly connected to the insulating film (300).

6. The single-cell battery according to claim 2, characterized in that, The second bending portion (230) is provided with a plurality of second clearance holes (231), and the plurality of second clearance holes (231) are arranged at intervals along the second direction (Z); The insulating member (400) has a plurality of second protrusions (420), one of the second protrusions (420) being respectively disposed in one of the second clearance holes (231).

7. The single-cell battery according to claim 2, characterized in that, Along the third direction (Y), the second bend (230) abuts against the side wall of the insulating member (400) on the side away from the inner wall of the housing (100).

8. The single-cell battery according to claim 2, characterized in that, The first bend (220) is provided with a plurality of first clearance holes (221), and the plurality of first clearance holes (221) are arranged at intervals along the third direction (Y); The insulating member (400) has a plurality of first protrusions (410), each first protrusion (410) corresponding to a first clearance hole (221).

9. The single-cell battery according to any one of claims 1 to 7, characterized in that, Along the second direction (Z), the side of the first bend (220) away from the inner wall of the housing (100) abuts against the side wall of the insulating member (400).

10. A battery pack, characterized in that, The single cell battery includes any one of claims 1 to 9.

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