Winding drum, winding battery cell, battery, battery device and electric equipment

Abstract

The utility model discloses a winding drum, a winding cell, a battery, a battery device and electric equipment, the winding drum is used for winding a pole piece assembly and comprises a winding part, the winding part defines a cavity, a limiting part communicated with the cavity is formed on the winding part, and the limiting part is suitable for limiting one end of the pole piece assembly; and the supporting part is accommodated in the cavity and is suitable for supporting the winding part after the pole piece assembly is wound on the winding drum. According to the winding drum designed by the utility model, the problem of core pulling during winding of the pole piece assembly can be avoided, the production yield is improved, and the structural strength is better.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a reel, a wound battery core, a battery, a battery device and electrical equipment. Background Art

[0002] In the related art, the electrode core of a wound battery is mainly wound by winding needles of different sizes. After the winding is completed, the winding needle is pulled out, leaving a central hole in the center of the electrode core that is the same size as the winding needle. There is no support in the hole, and only part of the electrode sheet at the head end of the electrode core is filled. When the battery is in use, as the electrode sheet expands and contracts, there is a risk of collapse in the center hole of the electrode core, which leads to a decline in battery performance and even safety risks, causing the battery to fail prematurely.

[0003] In some existing technologies, the pole core is wound by a reel, and the reel is left inside the pole core to serve as a supporting structure inside the pole core. However, the structural strength of the reel itself is limited. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a reel. The reel designed according to the utility model can avoid the problem of core pulling during winding of the pole piece assembly, improve the production yield, and has better structural strength.

[0005] The utility model also provides a wound battery core having the winding drum.

[0006] The utility model also provides a battery with the wound battery core.

[0007] The utility model also provides a battery device having the battery.

[0008] The utility model also provides an electrical device having the battery device.

[0009] According to the utility model, the reel is used for winding the pole piece assembly and comprises: a winding portion, the winding portion enclosing a cavity, a limiting portion formed on the winding portion and connected to the cavity, the limiting portion being suitable for limiting one end of the pole piece assembly; a supporting portion, the supporting portion being accommodated in the cavity and being suitable for supporting the winding portion after the pole piece assembly is wound on the reel.

[0010] The reel according to the utility model can be used for winding the pole piece assembly, and its limiting part cooperates with one end of the pole piece assembly to prevent the pole piece assembly from moving when the winding part drives the pole piece assembly to perform the winding action, thereby avoiding the problem of core pulling of the pole piece assembly during winding, thereby improving the production yield, and the winding part of the reel supports the pole piece assembly on the inner side of the pole piece assembly, which can solve the problem of the inner collapse of the center of the pole piece assembly after winding, thereby improving the battery performance and reducing the battery safety risk, and at the same time, the supporting part inside the winding part can strengthen the strength of the winding part to ensure the battery yield and battery performance.

[0011] According to some embodiments of the present invention, the limiting portion is configured as an opening formed on an outer surface of the winding portion, and the opening extends along an axial direction of the winding portion.

[0012] According to some embodiments of the present invention, the support portion is formed with a plurality of support feet spaced apart in the winding direction, and at least one support foot is spaced apart from the inner surface of the winding portion facing the cavity to form a gap.

[0013] According to some embodiments of the utility model, 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 both sides of the first support plate in the radial direction and both sides of the second support plate in the radial direction are respectively constructed as the support feet; wherein one side of the first support plate in the radial direction is spaced apart from the inner surface, and one side of the second support plate in the radial direction is spaced apart from the inner surface.

[0014] According to some embodiments of the present invention, an 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°.

[0015] According to some embodiments of the present invention, before the pole piece assembly is wound, the opening spacing is 0.5 to 4 mm.

[0016] According to some embodiments of the present invention, the roughness of the inner surface of the winding portion is greater than the roughness of the outer surface of the winding portion.

[0017] According to some embodiments of the present invention, the winding portion is configured as a cylinder or a regular polygonal cylinder.

[0018] The following briefly describes a wound battery cell according to an embodiment of the second aspect of the utility model.

[0019] The wound battery cell according to the utility model comprises: a winding drum, the winding drum is configured as any one of the above embodiments; a pole piece assembly, the pole piece assembly is wound around the outer periphery of the winding portion, and one end of the pole piece assembly is connected to the limiting portion to be fixed to the winding portion. Since the wound battery cell according to the utility model is provided with the winding drum of the above embodiment, the wound battery cell has better performance and is safer to use.

[0020] According to some embodiments of the present invention, the axial dimension H1 of the drum and the axial dimension H2 of the pole piece assembly satisfy: H1<H2.

[0021] According to some embodiments of the present invention, 2mm≤H2-H1≤20mm.

[0022] The following briefly describes a battery according to an embodiment of the third aspect of the utility model.

[0023] The battery according to the utility model includes the wound battery core described in any one of the above embodiments. Since the battery according to the utility model is provided with the wound battery core described in the above embodiments, the battery has better performance.

[0024] The following briefly describes a battery device according to an embodiment of the fourth aspect of the utility model.

[0025] The battery device according to the utility model includes the battery described in the above embodiment. Since the battery device according to the utility model is provided with the battery described in the above embodiment, the battery device is safe to use.

[0026] The following briefly describes the electrical equipment according to the fifth embodiment of the utility model.

[0027] The electric device according to the utility model comprises the battery described in the above embodiment or comprises the battery device described in the above embodiment. Since the electric device according to the utility model is provided with the battery device described in the above embodiment, the electric device works more reliably.

[0028] To sum up, the reel according to the utility model can be used to wind the pole piece assembly. The winding portion of the reel supports the pole piece assembly on the inner side of the pole piece assembly, which can solve the problem of the inner collapse of the center of the pole piece assembly after winding, thereby improving battery performance and reducing battery safety risks. At the same time, the supporting portion inside the winding portion can strengthen the strength of the winding portion to ensure the battery yield and battery performance.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a schematic structural diagram of a reel of an unwound pole piece assembly according to an embodiment of the utility model.

[0032] Figure 2 yes Figure 1 Top view of the structure.

[0033] Figure 3 It is a schematic structural diagram of a reel wound with a pole piece assembly according to an embodiment of the utility model.

[0034] Figure 4 It is a schematic diagram of the dimensions of a pole piece assembly according to an embodiment of the utility model.

[0035] Reference numerals:

[0036] 1. wound battery cell; 2. reel; 21. support portion; 211. support foot; 212. first support plate; 213. second support plate; 22. opening; 23. gap; 24. winding portion; 24a. cavity; 3. pole piece assembly. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, 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" 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 invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the related art, the electrode core of a wound battery is mainly wound by winding needles of different sizes. After the winding is completed, the winding needle is pulled out, leaving a central hole in the center of the electrode core that is the same size as the winding needle. There is no support in the hole, and only part of the electrode sheet at the head end of the electrode core is filled. When the battery is in use, as the electrode sheet expands and contracts, there is a risk of collapse in the center hole of the electrode core, which leads to a decline in battery performance and even safety risks, causing the battery to fail prematurely.

[0043] In some existing technologies, the pole core is wound by a reel, and the reel is left inside the pole core to serve as a supporting structure inside the pole core. However, the structural strength of the reel itself is limited.

[0044] Reference below Figure 1-Figure 3 A reel 2 according to an embodiment of the present invention is described.

[0045] like Figure 2As shown, according to the utility model, the reel 2 is used for winding the pole piece assembly 3 and comprises: a winding portion 24 and a supporting portion 21, the winding portion 24 encloses a cavity 24a, a limiting portion connected to the cavity 24a is formed on the winding portion 24, and the limiting portion is suitable for limiting one end of the pole piece assembly 3; the supporting portion 21 is accommodated in the cavity 24a and is suitable for supporting the winding portion 24 after the pole piece assembly 3 is wound on the reel 2. Specifically, when the pole piece assembly 3 is wound on the winding part 24, one end of the pole piece assembly 3 can cooperate with the limiting part, and the limiting part is suitable for limiting the one end of the pole piece assembly 3. After the pole piece assembly 3 is wound on the winding part 24, the other end of the pole piece assembly 3 is located on the outer side of the pole piece assembly 3 in the radial direction, and one end of the pole piece assembly 3 is located on the inner side of the pole piece assembly 3 in the radial direction and cooperates with the limiting part, so that one end of the pole piece assembly 3 can be accommodated in the cavity 24a of the winding part 24, avoiding wrinkles or misalignment at one end of the pole piece assembly 3 when winding. And when the pole piece assembly 3 is wound, since one end of the pole piece assembly 3 cooperates with the limiting part to fix one end of the pole piece assembly 3 on the winding part 24, by fixing one end of the pole piece assembly 3, the action of winding one end of the pole piece assembly 3 on the winding part 24 can be transmitted to other parts of the pole piece assembly 3 that are subsequently wound on the winding part 24.

[0046] Here, the pole piece assembly 3 may include a positive pole piece assembly, a separator, a negative pole piece assembly and a separator laminate stacked in sequence. The first end of the separator generally protrudes from the positive pole piece assembly and the negative pole piece assembly, and the first end of the separator of the pole piece assembly 3 may cooperate with the limiting part so that the limiting part limits the pole piece assembly 3 and facilitates the transmission of the winding action to the positive and negative pole piece assemblies wound subsequently.

[0047] More specifically, 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 will generate pressure on the reel 2 located on the inner side of the pole piece assembly 3 in the radial direction, causing the reel 2 to have a tendency to collapse toward the inside of the cavity 24a. Therefore, a support portion 21 is provided in the cavity 24a of the winding portion 24 to stop against the wall of the cavity 24a to support the winding portion 24 and prevent the winding portion 24 from collapsing toward the inside of the cavity 24a, thereby strengthening the structural strength of the reel 2 and ensuring the yield rate and performance of the wound battery cell 1.

[0048] The reel 2 according to the utility model can be used for winding the pole piece assembly 3, and its limiting part cooperates with one end of the pole piece assembly 3, so as 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 core pulling of the pole piece assembly 3 during winding, and further improving the production yield. In addition, the winding part 24 of the reel 2 supports the pole piece assembly 3 on the inner side of the pole piece assembly 3, which can solve the problem of the center collapse of the pole piece assembly 3 after winding, thereby improving the performance of the wound battery cell 1 and reducing the safety risk of the wound battery cell 1. At the same time, the supporting part 21 inside the winding part 24 can strengthen the strength of the winding part 24, and ensure the use yield and performance of the wound battery cell 1.

[0049] In some embodiments, after the pole piece assembly 3 is wound on the winding portion 24 , the cavity 24 a inside the winding portion 24 can be used to accommodate electrolyte.

[0050] In some embodiments, a via hole suitable for electrolyte to pass through is formed on the winding portion 24 , and the via hole can guide the electrolyte located in the inner cavity 24 a of the winding portion 24 to the pole piece assembly 3 located outside the winding portion 24 , so that the electrolyte can infiltrate the pole piece assembly 3 .

[0051] In some embodiments, after the pole piece assembly 3 is wound on the winding portion 24, the cavity 24a inside the winding portion 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 diffuse to the cavity 24a, avoiding excessive local heat in the pole piece assembly 3 and ensuring safe use.

[0052] In some embodiments, a heat dissipation structure is disposed in the cavity 24 a for exchanging heat with the medium in the cavity 24 a .

[0053] According to some embodiments of the present invention, Figure 2 As shown, the limiting portion is configured as an opening 22 formed on the outer surface of the winding portion 24, and the opening 22 extends along the axial direction of the winding portion 24. Specifically, the head end of the diaphragm extends from the opening 22 into the cavity 24a, and here, the opening 22 is arranged to penetrate the winding portion 24 in the radial direction to communicate the external space of the winding portion 24 with the cavity 24a inside the winding portion 24.

[0054] 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 so that the head end of the diaphragm can extend into the cavity 24a through the opening 22.

[0055] In some embodiments, the axial length of the pole piece assembly 3 is not less than the axial length of the winding portion 24. In order to allow the head end of the diaphragm to extend into the cavity 24a through the opening 22, 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.

[0056] According to some embodiments of the present invention, Figure 2As shown, the support portion 21 is formed with a plurality of support legs 211 spaced apart in the winding direction, and at least one support leg 211 is spaced apart from the inner surface of the winding portion 24 facing the cavity 24a to form a gap 23. Specifically, before the pole piece assembly 3 is wound, an opening 22 extending in the axial direction is formed on the winding portion 24, and the opening 22 is arranged to penetrate 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 opening 22 to close to clamp the head end of the diaphragm located in the cavity 24a. Here, if the support legs 211 are all connected to the inner surface of the cavity 24a, then the opening 22 formed on the winding portion 24 cannot be opened, and the head end of the diaphragm cannot be extended from the opening 22 into the cavity 24a.

[0057] In some embodiments, after the front end of the diaphragm is placed into the cavity 24a through the opening 22, in order to facilitate fixing the front end of the diaphragm on the winding portion 24, the front end of the diaphragm is extended into the gap 23. At this time, the support foot 211 can stop against the front end of the diaphragm to enhance the limiting ability of the winding drum 2 on the pole piece assembly 3, thereby preventing the pole piece assembly 3 from moving during use or winding.

[0058] In addition, the multiple supporting feet 211 of the supporting portion 21 are arranged at intervals to provide multi-point support for the winding portion 24 in the winding direction of the pole piece assembly 3, thereby preventing the winding portion 24 from collapsing toward the inside of the cavity 24a during the winding process of the pole piece assembly 3 or during the use of the pole piece assembly 3, thereby enhancing the structural strength of the reel 2.

[0059] According to some embodiments of the present invention, Figure 2 As shown, the support portion 21 includes a first support plate 212 and a second support plate 213, the first support plate 212 intersects with the second support plate 213, and both sides of the first support plate 212 and both sides of the second support plate 213 in the radial direction are respectively constructed as 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.

[0060] Here, one end of the first support plate 212, 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 spaced apart in the circumferential direction. In some embodiments, the opening 22 is directly opposite to the space defined between the other end of the second support plate 213 and one end of the first support plate 212. Before the pole piece assembly 3 is wound, one end of the first support plate 212 and one end of the second support plate 213 are spaced apart from the surface of the winding portion 24 facing the cavity 24a to form a gap 23, so that 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 toward the support portion 21, so as to reduce the gap 23 between the winding portion 24 and one end of the first support plate 212 and one end of the second support plate 213, so that one end of the first support plate 212 and one end of the second support plate 213 and the surface of the winding portion 24 facing the cavity 24a can stop against the head end of the diaphragm in the radial direction, thereby fixing the head end of the diaphragm on the winding portion 24, so as to enhance the limiting ability of the winding portion 24 on the pole piece assembly 3 and prevent the pole piece assembly 3 from moving during use or winding.

[0061] In some embodiments, the first support plate 212 and the second support plate 213 of the support portion 21 are intersected to form a "cross" support structure. This "cross" support structure is set in the cavity 24a and stops against the surface of the winding portion 24 facing the cavity 24a to increase the pressure-bearing capacity of the winding portion 24, thereby strengthening the structural strength of the reel 2.

[0062] In some embodiments, the first support plate 212 and the second support plate 213 have the same thickness.

[0063] In some embodiments, if the thickness of the first support plate 212 and the second support plate 213 is too thick, it is easy to cause the roll 2 to be too heavy, and if it is too thin, it is easy to cause the support effect of the support part 21 on the winding part 24 to be poor. Figure 3 As shown, the thickness X1 of the first support plate 212 and the second support plate 213 is between 0.5 mm and 3 mm.

[0064] According to some embodiments of the present invention, Figure 2As shown, 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 α, and satisfies: 30°≤α≤90°. It can be understood that if the angle α 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 will not be able to support the winding portion 24 between two adjacent support legs 211, so that the supporting effect of the support portion 21 on the winding portion 24 is limited, and the winding portion 24 may still collapse inward; if the angle α 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 supporting legs 211 will be arranged too densely and in too large a number, affecting the overall weight of the reel 2. Therefore, the value of the angle α between the first support plate 212 and the second support plate 213 in the circumferential direction of the winding portion 24 satisfies 30°≤α≤90°, so as to reduce the overall weight of the reel 2 while ensuring the supporting effect on the winding portion 24.

[0065] According to some embodiments of the present invention, Figure 2-Figure 3 As shown, the spacing of the openings 22 is 0.5 to 4 mm. In some embodiments, before the pole piece assembly 3 is wound, an opening 22 extending in the axial direction is formed on the winding portion 24, and the opening 22 is arranged to penetrate 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 opening 22 to close, so as to clamp the head end of the diaphragm located in the cavity 24a.

[0066] It is understandable that if both ends of the first support plate 212 and the second support plate 213 are connected to the side walls, the opening 22 formed on the winding portion 24 cannot be opened, and the first end of the diaphragm cannot be extended from the opening 22 into the cavity 24a.

[0067] In some embodiments, the distance between one end of the first support plate 212 and one end of the second support plate 213 and the surface of the winding portion 24 facing the cavity 24a is between 0.5 mm and 2 mm, so that the pole piece assembly 3 extends from the opening 22 into the cavity 24a.

[0068] In some embodiments, before the pole piece assembly 3 is wound, the spacing between the openings 22 formed on the winding portion 24 is between 0.5 mm and 4 mm, so as to fix the head end of the diaphragm.

[0069] In some embodiments, a surface of the winding portion 24 facing the cavity 24a and / or a surface of the winding portion 24 away from the cavity 24a is provided with an adhesive layer, and the adhesive layer is used to adhere the head end of the diaphragm to the winding portion 24 to limit the head end of the diaphragm.

[0070] According to some embodiments of the present invention, 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. Here, the roughness of the inner surface of the winding portion 24 is greater, which can prevent the first end of the diaphragm from sliding during winding and affecting the winding operation of the pole piece assembly 3, while the roughness of the outer surface of the winding portion 24 is smaller, which can prevent the pole piece assembly 3 from being damaged due to friction.

[0071] According to some embodiments of the present invention, the winding portion 24 is configured as a cylinder or a regular polygonal cylinder, and the interior of the winding portion 24 is hollow. Figure 3 As shown, the winding portion 24 is in a hollow column shape as a whole, with an inner circle diameter d of 2 to 18 mm and an outer circle diameter D of 4 to 20 mm.

[0072] In some embodiments, the material used for the reel 2 is one of a polyvinylidene fluoride core, a polypropylene core, an EPDM rubber core and a fluororubber core.

[0073] The wound battery cell 1 according to the present invention is briefly described below.

[0074] like Figure 3 As shown, the wound battery cell 1 according to the utility model includes: a reel 2 and a pole piece assembly 3, the reel 2 is constructed as the reel 2 described in any one of the above embodiments; the pole piece assembly 3 is wound and arranged on the outer periphery of the winding portion 24, and the head end of the diaphragm is connected to the limiting portion to be fixed to the winding portion 24 to avoid wrinkles or misalignment at one end of the pole piece assembly 3 when winding, and when the pole piece assembly 3 is wound, the head end of the diaphragm cooperates with the limiting portion to fix the head end of the diaphragm to the winding portion 24, thereby transmitting the action of the head end of the diaphragm being wound on the winding portion 24 to other parts of the pole piece assembly 3 subsequently wound on the winding portion 24.

[0075] Since the wound battery core 1 according to the present invention is provided with the winding drum 2 of the above embodiment, the wound battery core 1 has better performance and is safer to use.

[0076] According to some embodiments of the present invention, Figure 1 , Figure 4 As shown, the axial dimension H1 of the reel 2 and the axial dimension H2 of the pole piece assembly 3 satisfy: H1<H2. It can be understood that the axial dimension of the reel 2 is sufficient to support the dressing area on the pole piece assembly 3, because the pole ear areas on both sides of the pole piece assembly 3 in the axial direction will not collapse in the process of use, and the extension of the reel 2 to the pole ear area in the axial direction is a waste of material. Therefore, the axial dimension H1 of the reel 2 is smaller than the axial dimension H2 of the pole piece assembly 3.

[0077] According to some embodiments of the present invention, 2mm≤H2-H1≤20mm, so as to ensure that the reel 2 can support the dressing area of ​​the pole piece assembly 3 in the axial direction while avoiding material waste caused by the reel 2 being too long.

[0078] The battery according to the utility model is briefly described below.

[0079] The battery according to the utility model includes the wound battery cell 1 described in any one of the above embodiments. Here, the battery can be a cylindrical battery, a prismatic battery, or a soft-pack battery, etc. Since the battery according to the utility model is provided with the wound battery cell 1 described in the above embodiment, the battery has better performance.

[0080] The battery device according to the present utility model is briefly described below.

[0081] The battery device according to the utility model includes the battery described in the above embodiment. Here, the battery device can be a battery pack, a battery cluster, etc. Since the battery device according to the utility model is provided with the battery of the above embodiment, the battery device is safe to use.

[0082] The electrical equipment according to the utility model is briefly described below.

[0083] The electric device according to the utility model includes the battery described in the above embodiment or includes the battery device described in the above embodiment. Here, the electric device can be a car, an aircraft, a computer, etc. Since the electric device according to the utility model is provided with the battery device of the above embodiment, the electric device works more reliably.

[0084] To sum up, according to the utility model, the reel 2 can be used for winding the pole piece assembly 3. The winding portion 24 of the reel 2 supports the pole piece assembly 3 on the inner side of the pole piece assembly 3, which can solve the problem of the central collapse of the pole piece assembly 3 after winding, thereby improving the performance of the wound battery cell 1 and reducing the safety risk of the wound battery cell 1. At the same time, the support portion 21 inside the winding portion 24 can strengthen the strength of the winding portion 24, thereby ensuring the yield rate and performance of the wound battery cell 1.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0086] Although embodiments of the present invention have been shown and described above, changes, modifications, substitutions and variations may be made to the embodiments described above.

Claims

1. A reel (2), characterized in that: The winding drum (2) is used for winding the pole piece assembly (3), and the winding drum (2) comprises: A winding portion (24), the winding portion (24) enclosing a cavity (24a), a limiting portion in communication with the cavity (24a) being formed on the winding portion (24), the limiting portion being suitable for limiting one end of the pole piece assembly (3); A support portion (21), the support portion (21) being received in the cavity (24a) and being suitable for supporting the winding portion (24) after the pole piece assembly (3) is wound on the winding drum (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), and the opening (22) extends along the axial direction of the winding portion (24).

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

4. The reel (2) according to claim 3, characterized in that The support portion (21) comprises: A first support plate (212) and a second support plate (213), wherein the first support plate (212) intersects with the second support plate (213), and both sides of the first support plate (212) in the radial direction and both sides of the second support plate (213) in the radial direction are respectively configured as the support feet (211); 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 reel (2) according to claim 4, characterized in that An included angle between the first support plate (212) and the second support plate (213) in the circumferential direction of the winding portion (24) is α, and satisfies: 30°≤α≤90°.

6. The reel (2) according to claim 2, characterized in that The size of the opening (22) in the circumferential direction is 0.5-4 mm.

7. The reel (2) according to any one of claims 1 to 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 reel (2) according to any one of claims 1 to 6, characterized in that The winding portion (24) is configured as a cylinder or a regular polygonal cylinder.

9. A wound battery cell (1), characterized in that: include: A reel (2), wherein the reel (2) is configured as a reel (2) according to any one of claims 1 to 8; A pole piece assembly (3), wherein the pole piece assembly (3) is wound around the outer periphery of the winding portion (24), and one end of the pole piece 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 dimension H1 of the winding drum (2) in the axial direction and the dimension H2 of the pole piece assembly (3) in the axial direction 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: It comprises a wound battery cell (1) according to any one of claims 9 to 11.

13. A battery device, characterized in that: Comprising a battery according to claim 12.

14. An electrical device, characterized in that: Comprising a battery according to claim 12 or comprising a battery device according to claim 13.

Images