Winding cylinder, wound cell, battery, battery device and electric apparatus

Abstract

A winding cylinder, a wound cell, a battery, a battery device and an electric apparatus. The winding cylinder is used for winding an electrode sheet assembly and comprises a winding portion and a support portion, wherein the winding portion encloses a cavity, a limiting portion in communication with the cavity is formed on the winding portion, and the limiting portion is suitable for limiting one end of the electrode sheet assembly; and the support portion is accommodated in the cavity and is suitable for supporting the winding portion after the electrode sheet assembly is wound around the winding cylinder.

Description

Winding drum, wound cell, battery, battery device and electric device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 2024213975047, filed on June 18, 2024, and entitled “Winding drum, wound cell, battery, battery device and electric device”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of batteries, in particular to a winding drum, a wound cell, a battery, a battery device and an electric device. BACKGROUND

[0004] In the related art, the pole core of the wound battery is mainly wound by winding needles of different sizes. After winding is completed, the winding needle is extracted, leaving a center hole in the center of the pole core, which is comparable in size to the winding needle. There is no support in the hole, only part of the pole piece at the first end of the pole core is filled. When the battery is used, there is a risk of collapse in the center hole of the pole core due to the expansion and contraction of the pole piece, which leads to a decrease in battery performance and even causes a safety risk, resulting in premature failure of the battery.

[0005] In some existing technologies, a winding drum is used to wind the pole core, and the winding drum remains inside the pole core to serve as a support structure. However, the structural strength of the winding drum is limited. SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a winding drum that can avoid the problem of winding and extracting the pole piece assembly, improve production yield, and have better structural strength.

[0007] The present application also provides a wound cell having the above-mentioned winding drum.

[0008] The present application also provides a battery having the above-mentioned wound cell.

[0009] The present application also provides a battery device having the above-mentioned battery.

[0010] The present application also provides an electric device having the above-mentioned battery device.

[0011] The winding drum according to the present application is used to wind a pole piece assembly and comprises a winding portion surrounding a cavity, a limiting portion formed on the winding portion and communicating with the cavity, the limiting portion being adapted to limit one end of the pole piece assembly, and a support portion accommodated in the cavity and adapted to support the winding portion after the pole piece assembly is wound on the winding drum.

[0012] The winding drum according to the present application can be used for winding the pole piece assembly, the limiting portion of which cooperates with one end of the pole piece assembly, and can avoid movement of the pole piece assembly when the winding portion drives the pole piece assembly to perform a winding action, thereby avoiding the problem of core extraction of the pole piece assembly during winding, and further improving the production yield. The winding portion of the winding drum supports the pole piece assembly from the inside of the pole piece assembly, which can solve the problem of center collapse of the pole piece assembly after winding, thereby improving the performance of the battery and reducing the safety risk of the battery. At the same time, the support portion inside the winding portion can strengthen the strength of the winding portion, and ensure the use yield and performance of the battery.

[0013] In some examples of the present application, the limiting portion is configured as an opening formed on the outer surface of the winding portion, and the opening extends along the axial direction of the winding portion.

[0014] In some examples of the present application, the support portion is formed with a plurality of support feet arranged at intervals in the winding direction, and at least one support foot is arranged at an interval with the inner surface of the cavity toward the winding portion to form a gap.

[0015] In some examples of the present application, the support portion includes a first support plate and a second support plate, the first support plate and the second support plate intersect at the central axis of the winding portion, and the two sides of the first support plate in the radial direction and the two sides of the second support plate in the radial direction are respectively configured as the support feet; wherein one side of the first support plate in the radial direction is arranged at an interval with the inner surface, and one side of the second support plate in the radial direction is arranged at an interval with the inner surface.

[0016] In some examples of the present application, the included angle between the first support plate and the second support plate in the circumferential direction of the winding portion is α, and satisfies: 30°≤α≤90°.

[0017] In some examples of the present application, the opening interval before the pole piece assembly is wound is 0.5-4mm.

[0018] In some examples of the present application, the roughness of the inner surface of the winding portion is greater than the roughness of the outer surface of the winding portion.

[0019] In some examples of the present application, the winding portion is configured as a cylinder or a regular polygonal cylinder.

[0020] In some examples of the present application, the width of the tab protection sheet is 8-12mm.

[0021] In some examples of the present application, the welding point is arranged in the welding point area of the tab, the welding point area includes an ultrasonic welding area and a laser welding area, and the laser welding area is located in the ultrasonic welding area.

[0022] In some examples of the present application, the width of the ultrasonic welding region in the extension direction of the tab is 4-8 mm.

[0023] The wound battery cell according to the present application comprises: a winding drum configured as any one of the winding drums described in the above embodiments; and a tab assembly wound around the outer periphery of the winding portion, one end of the tab assembly being connected to the limiting portion to be fixed to the winding portion.

[0024] The wound battery cell according to the present application is provided with the winding drum of the above embodiments, and thus has better performance and is safer to use.

[0025] In some examples of the present application, the size H1 of the winding drum in the axial direction and the size H2 of the tab assembly in the axial direction satisfy: H1 < H2.

[0026] In some examples of the present application, 2 mm ≤ H2-H1 ≤ 20 mm.

[0027] The battery according to the present application comprises the wound battery cell described above.

[0028] The battery according to the present application is provided with the wound battery cell of the above embodiments, and thus has better performance.

[0029] The battery device according to the present application comprises the battery described above.

[0030] The battery device according to the present application is provided with the battery of the above embodiments, and thus is safe to use.

[0031] The power consuming device according to the present application comprises the battery or battery device described above.

[0032] The power consuming device according to the present application is provided with the battery device of the above embodiments, and thus works more reliably.

[0033] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a structural schematic view of a winding drum without a tab assembly wound thereon according to an embodiment of the present application.

[0035] FIG. 2 is a top view of the structure in FIG. 1.

[0036] FIG. 3 is a structural schematic view of a winding drum with a tab assembly wound thereon according to an embodiment of the present application.

[0037] FIG. 4 is a size schematic view of a tab assembly according to an embodiment of the present application.

[0038] Reference numerals: 1. Winded cell; 2. Drum; 21. Support part; 211. Support foot; 212. First support plate; 213. Second support plate; 22. Opening; 23. Gap; 24. Winding part; 24a. Cavity; 3. Electrode assembly. Detailed Implementation

[0039] 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.

[0040] The roll 2 according to an embodiment of the present application is described below with reference to Figures 1-3.

[0041] As shown in Figure 2, the roll 2 according to this application is used to wind the electrode assembly 3 and includes: a winding portion 24 and a support portion 21. The winding portion 24 surrounds a cavity 24a. A limiting portion communicating with the cavity 24a is formed on the winding portion 24. The limiting portion is adapted to limit one end of the electrode assembly 3. The support portion 21 is housed in the cavity 24a and is adapted to support the winding portion 24 after the electrode assembly 3 is wound on the roll 2. In some embodiments, when the electrode assembly 3 is wound in the winding portion 24, one end of the electrode assembly 3 can cooperate with the limiting portion, which is adapted to limit one end of the electrode assembly 3. The other end of the electrode assembly 3 is located on the outer side of the electrode assembly 3 in the radial direction after the electrode assembly 3 is wound in the winding portion 24, and one end of the electrode assembly 3 is located on the inner side of the electrode assembly 3 in the radial direction and cooperates with the limiting portion, so that one end of the electrode assembly 3 can be received in the cavity 24a of the winding portion 24, avoiding wrinkles or misalignment of one end of the electrode assembly 3 during winding. Furthermore, when the electrode assembly 3 is wound, since one end of the electrode assembly 3 cooperates with the limiting portion to fix one end of the electrode assembly 3 to the winding portion 24, by fixing one end of the electrode assembly 3, the action of winding one end of the electrode assembly 3 in the winding portion 24 can be transmitted to the other parts of the electrode assembly 3 subsequently wound in the winding portion 24.

[0042] Here, the electrode assembly 3 may include a positive electrode assembly, a separator, a negative electrode assembly, and a separator laminate stacked sequentially. The first end of the separator generally protrudes from the positive electrode assembly and the negative electrode assembly. The first end of the separator of the electrode assembly 3 may cooperate with the limiting part so that the limiting part limits the electrode assembly 3 and facilitates the transmission of the winding action to the subsequently wound positive and negative electrode assemblies.

[0043] In some embodiments, during the winding process of the pole piece assembly 3 or during the use of the pole piece assembly 3, the pole piece assembly 3 can generate pressure on the inner side of the winding drum 2 located in the radial direction of the pole piece assembly 3, so that the winding drum 2 has a tendency to collapse towards the inner side of the cavity 24a. Therefore, the support part 21 is arranged in the cavity 24a of the winding part 24 to abut against the wall surface of the cavity 24a to support the winding part 24 and prevent the winding part 24 from collapsing towards the inner side of the cavity 24a, thereby strengthening the structure of the winding drum 2 and ensuring the use yield and performance of the wound battery cell 1.

[0044] The winding drum 2 according to the present application can be used to wind the pole piece assembly 3. The limiting part cooperates with one end of the pole piece assembly 3 to prevent the pole piece assembly 3 from moving when the winding part 24 drives the pole piece assembly 3 to perform the winding action, thereby avoiding the problem of winding core extraction of the pole piece assembly 3 and improving the production yield. In addition, the winding part 24 of the winding drum 2 supports the pole piece assembly 3 from the inner side of the pole piece assembly 3, which can solve the problem of core collapse of the pole piece assembly 3 after winding, thereby improving the performance of the wound battery cell 1, reducing the safety risk of the wound battery cell 1, and strengthening the strength of the winding part 24 by the support part 21 inside the winding part 24, thereby ensuring the use yield and performance of the wound battery cell 1.

[0045] In some embodiments, after the pole piece assembly 3 is wound on the winding part 24, the cavity 24a inside the winding part 24 can be used to accommodate electrolyte.

[0046] In some embodiments, the winding part 24 is formed with a via suitable for the electrolyte to pass through. The via can guide the electrolyte located in the cavity 24a inside the winding part 24 to the pole piece assembly 3 located outside the winding part 24, so that the electrolyte can soak the pole piece assembly 3.

[0047] In some embodiments, after the pole piece assembly 3 is wound on the winding part 24, the cavity 24a inside the winding part 24 can be used as a heat dissipation channel. When the pole piece assembly 3 is working, the heat generated inside the pole piece assembly 3 can be diffused to the cavity 24a, thereby avoiding excessive local heat of the pole piece assembly 3 and ensuring the use safety.

[0048] In some embodiments, a heat dissipation structure is arranged in the cavity 24a to exchange heat with the medium in the cavity 24a.

[0049] According to some embodiments of the present application, as shown in FIG. 2, the limiting part is configured as an opening 22 formed on the outer surface of the winding part 24. The opening 22 extends along the axial direction of the winding part 24. In some embodiments, the first end of the diaphragm extends into the cavity 24a through the opening 22. Here, the opening 22 penetrates the winding part 24 in the radial direction to communicate the space outside the winding part 24 with the cavity 24a inside the winding part 24.

[0050] In some embodiments, the pole piece assembly 3 is wound around the outer periphery of the winding portion 24, the axial direction of the pole piece assembly 3 is consistent with the axial direction of the winding portion 24, and the opening 22 extends along the axial direction of the winding portion 24 to enable the membrane leading end to extend into the cavity 24a through the opening 22.

[0051] In some embodiments, the length of the pole piece assembly 3 in the axial direction is not less than the length of the winding portion 24 in the axial direction, and the opening 22 extends along the axial direction of the winding portion 24 and penetrates the winding portion 24 in the axial direction of the winding portion 24 to enable the membrane leading end to extend into the cavity 24a through the opening 22.

[0052] According to some embodiments of the present application, as shown in FIG. 2, the support portion 21 is formed with a plurality of support feet 211 spaced apart in the winding direction, and at least one support foot 211 is spaced apart from the inner surface of the winding portion 24 facing the cavity 24a to form the gap 23. In some embodiments, before the pole piece assembly 3 is wound, the opening 22 extending in the axial direction is formed on the winding portion 24, the opening 22 is arranged to penetrate the winding portion 24 in the axial direction, and when the pole piece assembly 3 is wound on the winding portion 24, the pressure of the pole piece assembly 3 on the winding portion 24 causes the opening 22 to close to clamp the membrane leading end located in the cavity 24a. Here, if all the support feet 211 are connected to the inner surface of the cavity 24a, the opening 22 formed on the winding portion 24 cannot be opened, and the membrane leading end cannot be extended into the cavity 24a through the opening 22.

[0053] In some embodiments, after the membrane leading end is placed into the cavity 24a through the opening 22, in order to facilitate the fixation of the membrane leading end to the winding portion 24, the membrane leading end is extended into the gap 23, and at this time the support feet 211 can abut against the membrane leading end to improve the limiting ability of the winding drum 2 to the pole piece assembly 3, and avoid the pole piece assembly 3 from moving during use or winding.

[0054] In addition, the plurality of support feet 211 of the support portion 21 are spaced apart to achieve multi-point support of the winding portion 24 in the winding direction of the pole piece assembly 3, avoid the winding portion 24 from collapsing inward toward the cavity 24a during winding of the pole piece assembly 3 or during use of the pole piece assembly 3, and strengthen the structural strength of the winding drum 2.

[0055] According to some embodiments of the present application, as shown in FIG. 2, the support portion 21 includes a first support plate 212 and a second support plate 213, the first support plate 212 intersects the second support plate 213, and the two sides of the first support plate 212 in the radial direction and the two sides of the second support plate 213 in the radial direction are respectively configured as the support feet 211; wherein one side of the first support plate 212 in the radial direction is spaced apart from the inner surface, and one side of the second support plate 213 in the radial direction is spaced apart from the inner surface.

[0056] Here, the one end of the first support plate 212, the one end of the second support plate 213, the other end of the first support plate 212 and the other end of the second support plate 213 are arranged at intervals in the circumferential direction, and in some embodiments, the opening 22 is opposite the space defined between the other end of the second support plate 213 and the one end of the first support plate 212. Before the pole piece assembly 3 is wound, the one end of the first support plate 212 and the one end of the second support plate 213 are both spaced from the surface of the winding portion 24 facing the cavity 24a to form a gap 23. When the pole piece assembly 3 is wound on the winding portion 24, the pressure of the pole piece assembly 3 on the winding portion 24 can cause the winding portion 24 to move towards the support portion 21, thereby reducing the gap 23 between the winding portion 24 and the one end of the first support plate 212 and the one end of the second support plate 213. The one end of the first support plate 212 and the one end of the second support plate 213 and the surface of the winding portion 24 facing the cavity 24a can be radially stopped by the leading end of the diaphragm, thereby fixing the leading end of the diaphragm on the winding portion 24. This improves the ability of the winding portion 24 to limit the pole piece assembly 3 and prevents the pole piece assembly 3 from moving during use or winding.

[0057] In some embodiments, the first support plate 212 and the second support plate 213 of the support portion 21 intersect to form a "cross" support structure. This "cross" support structure is arranged in the cavity 24a and stops against the surface of the winding portion 24 facing the cavity 24a, thereby improving the pressure resistance of the winding portion 24 and enhancing the structural strength of the winding drum 2.

[0058] In some embodiments, the first support plate 212 and the second support plate 213 have the same thickness.

[0059] In some embodiments, if the first support plate 212 and the second support plate 213 are too thick, the weight of the winding drum 2 will be too large, and if they are too thin, the support effect of the support portion 21 on the winding portion 24 will be poor. Therefore, as shown in FIG. 3, the thickness X1 of the first support plate 212 and the second support plate 213 is between 0.5 mm and 3 mm.

[0060] According to some embodiments of the present application, as shown in FIG. 2, the included angle between the first support plate 212 and the second support plate 213 in the circumferential direction of the winding portion 24 is a, and satisfies: 30°≤a≤90°. It can be understood that if the included angle a between the first support plate 212 and the second support plate 213 in the circumferential direction of the winding portion 24 is too large, the first support plate 212 and the second support plate 213 cannot support the winding portion 24 between the two adjacent support feet 211, so that the support effect of the support portion 21 on the winding portion 24 is limited, and the winding portion 24 still has the possibility of collapsing inwardly. If the included angle a between the first support plate 212 and the second support plate 213 in the circumferential direction of the winding portion 24 is too small, the support feet 211 are arranged too densely and too many, which affects the overall weight of the winding drum 2. Therefore, the included angle a between the first support plate 212 and the second support plate 213 in the circumferential direction of the winding portion 24 satisfies: 30°≤a≤90°, so as to ensure the support effect on the winding portion 24 while reducing the overall weight of the winding drum 2.

[0061] According to some embodiments of the present application, as shown in FIGS. 2-3, the distance between the openings 22 is 0.5-4 mm. In some embodiments, before the pole piece assembly 3 is wound, the openings 22 extending in the axial direction are formed on the winding portion 24. The openings 22 are arranged through the winding portion 24 in the axial direction. When the pole piece assembly 3 is wound on the winding portion 24, the pressure of the pole piece assembly 3 on the winding portion 24 causes the openings 22 to close, so as to clamp the membrane leading end in the cavity 24a.

[0062] It can be understood that if the two ends of the first support plate 212 and the two ends of the second support plate 213 are connected with the side wall, the openings 22 formed on the winding portion 24 cannot be opened, and the membrane leading end cannot be inserted into the cavity 24a from the openings 22.

[0063] In some embodiments, the distance between the one end of the first support plate 212 and the one end of the second support plate 213 and the surface of the winding portion 24 facing the cavity 24a is 0.5-2 mm, so that the pole piece assembly 3 can be inserted into the cavity 24a from the openings 22.

[0064] In some embodiments, before the pole piece assembly 3 is wound, the distance between the openings 22 formed on the winding portion 24 is 0.5-4 mm, so as to fix the membrane leading end.

[0065] In some embodiments, the surface of the winding portion 24 facing the cavity 24a and / or the surface of the winding portion 24 away from the cavity 24a is provided with an adhesive layer, and the adhesive layer is used to bond the membrane leading end to the winding portion 24, so as to limit the membrane leading end.

[0066] According to some embodiments of the present application, the roughness of the inner surface of the winding part 24 is greater than the roughness of the outer surface of the winding part 24. Here, the greater roughness of the inner surface of the winding part 24 can avoid the sliding of the membrane head end during winding, thereby avoiding the influence of the winding operation of the pole piece assembly 3, and the smaller roughness of the outer surface of the winding part 24 can avoid the damage of the pole piece assembly 3 caused by friction.

[0067] According to some embodiments of the present application, the winding part 24 is configured as a cylinder or a regular polygonal cylinder, and the inside of the winding part 24 is hollow. In some embodiments, as shown in FIG. 3, the winding part 24 is a hollow column as a whole, the inner diameter d is 2-18 mm, and the outer diameter D is 4-20 mm.

[0068] In some embodiments, the material of the winding drum 2 is one of polyvinylidene fluoride winding core, polypropylene winding core, ethylene-propylene-diene rubber winding core, and fluororubber winding core.

[0069] The winding battery cell 1 according to the present application is briefly described below.

[0070] As shown in FIG. 3, the winding battery cell 1 according to the present application comprises: the winding drum 2 configured as the winding drum 2 of any one of the above embodiments; and the pole piece assembly 3 wound around the outer periphery of the winding part 24, and the membrane head end is connected with the limiting part to be fixed to the winding part 24, thereby avoiding the folding or misplacement of one end of the pole piece assembly 3 during winding, and when the pole piece assembly 3 is wound, the membrane head end is fixed to the winding part 24 by cooperation of the membrane head end and the limiting part, so that the action of winding the membrane head end on the winding part 24 is transmitted to other parts of the pole piece assembly 3 wound subsequently on the winding part 24.

[0071] Since the winding battery cell 1 according to the present application is provided with the winding drum 2 of the above embodiments, the performance of the winding battery cell 1 is better, and the use is safer.

[0072] According to some embodiments of the present application, as shown in FIG. 1 and FIG. 4, the size H1 of the winding drum 2 in the axial direction and the size H2 of the pole piece assembly 3 in the axial direction satisfy: H1 < H2. It can be understood that the size of the winding drum 2 in the axial direction only needs to satisfy that it can support the coating area of the pole piece assembly 3, because the tab area on both sides of the pole piece assembly 3 in the axial direction will not be internally collapsed during use, and the extension of the winding drum 2 in the axial direction to the tab area is material waste. Therefore, the size H1 of the winding drum 2 in the axial direction is smaller than the size H2 of the pole piece assembly 3 in the axial direction.

[0073] According to some embodiments of the present application, 2 mm ≤ H2-H1 ≤ 20 mm, so as to ensure that the winding drum 2 can support the coating area of the pole piece assembly 3 in the axial direction while avoiding the material waste caused by the excessive length of the winding drum 2.

[0074] The battery according to the present application is briefly described below.

[0075] The battery according to the present application includes the wound battery cell 1 according to any one of the above embodiments. Here, the battery can be a cylindrical battery, a prismatic battery, or a pouch battery, etc. Since the battery according to the present application is provided with the wound battery cell 1 according to the above embodiments, the battery has better performance.

[0076] The battery device according to the present application is briefly described as follows.

[0077] The battery device according to the present application includes the battery according to the above embodiments. Here, the battery device can be a battery pack, a battery cluster, etc. Since the battery device according to the present application is provided with the battery according to the above embodiments, the battery device is safe to use.

[0078] The power consuming device according to the present application is briefly described as follows.

[0079] The power consuming device according to the present application includes the battery according to the above embodiments or the battery device according to the above embodiments. Here, the power consuming device can be a car, an aircraft, a computer, etc. Since the power consuming device according to the present application is provided with the battery device according to the above embodiments, the power consuming device works more reliably.

[0080] In summary, the winding drum 2 according to the present application can be used to wind the electrode tab assembly 3, the winding part 24 of the winding drum 2 supports the electrode tab assembly 3 from the inside of the electrode tab assembly 3, which can solve the problem of the center collapse of the wound electrode tab assembly 3, thereby improving the performance of the wound battery cell 1, reducing the safety risk of the wound battery cell 1, and at the same time, the support part 21 inside the winding part 24 can strengthen the strength of the winding part 24, ensuring the use yield and performance of the wound battery cell 1.

[0081] In the description of the present specification, the description referring to the terms “one embodiment”, “some embodiments”, “exemplary embodiment”, “example”, “specific example”, or “some examples” etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A roll (2), characterized in that, The spool (2) is used to wind the electrode assembly (3), and the spool (2) includes: A winding portion (24) surrounds a cavity (24a), and a limiting portion communicating with the cavity (24a) is formed on the winding portion (24), the limiting portion being adapted to limit one end of the electrode assembly (3); A support portion (21) is housed within the cavity (24a) and is adapted to support the winding portion (24) after the electrode assembly (3) is wound around the spool (2).

2. The reel (2) according to claim 1, characterized in that, The limiting portion is configured as an opening (22) formed on the outer surface of the winding portion (24), the opening (22) extending along the axial direction of the winding portion (24).

3. The reel (2) according to claim 1 or 2, characterized in that, The support portion (21) is provided with a plurality of support feet (211) spaced apart in the winding direction, and at least one support foot (211) is spaced apart from the inner surface of the winding portion (24) toward the cavity (24a) to form a gap (23).

4. The roll (2) according to claim 3, characterized in that, The support portion (21) includes: A first support plate (212) and a second support plate (213) intersect, wherein the first support plate (212) and the second support plate (213) are respectively configured as support feet (211) on both sides of the first support plate (212) in the radial direction and on both sides of the second support plate (213) in the radial direction; wherein The first support plate (212) is spaced apart from the inner surface on one side in the radial direction, and the second support plate (213) is spaced apart from the inner surface on one side in the radial direction.

5. The roll (2) according to claim 4, characterized in that, The angle between the first support plate (212) and the second support plate (213) in the circumferential direction of the winding part (24) is α, and satisfies: 30°≤α≤90°.

6. The roll (2) according to claim 2, characterized in that, The opening (22) has a circumferential dimension of 0.5 to 4 mm.

7. The roll (2) according to any one of claims 1-6, characterized in that, The roughness of the inner surface of the winding portion (24) is greater than the roughness of the outer surface of the winding portion (24).

8. The roll (2) according to any one of claims 1-6, characterized in that, The winding portion (24) is constructed as a cylinder or a regular polygonal cylinder.

9. A wound battery cell (1), characterized in that, include: A reel (2), the reel (2) being constructed as claimed in any one of claims 1-8; An electrode assembly (3) is wound around the outer periphery of the winding portion (24), and one end of the electrode assembly (3) is connected to the limiting portion to be fixed to the winding portion (24).

10. The wound battery cell (1) according to claim 9, characterized in that, The axial dimension H1 of the roller (2) and the axial dimension H2 of the electrode assembly (3) satisfy: H1 < H2.

11. The wound battery cell (1) according to claim 10, characterized in that, 2mm≤H2-H1≤20mm.

12. A battery, characterized in that, Includes the wound battery cell (1) according to any one of claims 9-11.

13. A battery device, characterized in that, Includes the battery according to claim 12.

14. An electrical appliance, characterized in that, Includes the battery according to claim 12 or the battery device according to claim 13.

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