Roll core structure, battery and electric equipment

Abstract

The utility model discloses a roll core structure, a battery and electric equipment, the roll core structure comprises a negative electrode assembly, a positive electrode assembly and a diaphragm which are arranged in a winding manner, and the diaphragm is located between the negative electrode assembly and the positive electrode assembly to insulate and separate the negative electrode assembly from the positive electrode assembly; the winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting end of the first diaphragm and the winding starting end of the second diaphragm are flush with one another; the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, the winding ending end of the first diaphragm and the winding ending end of the second diaphragm are flush. According to the roll core structure, the battery and the electric equipment, the production is convenient, and the production efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a winding core structure, a battery and an electrical device. Background Art

[0002] The winding core of a cylindrical battery usually includes a positive electrode sheet, a negative electrode sheet and two separators. When winding the core, the existing winding equipment sandwiches the two separators in the middle of the winding needle, winds the separators on the winding needle to fix the separators on the winding needle, and then puts in the negative electrode sheet and the positive electrode sheet respectively, and then rotates the winding needle. After winding, the positive electrode sheet, the negative electrode sheet and the separator are cut off respectively and the ending tape is pasted to fix the winding core. Finally, the winding needle is pulled out from the middle of the winding core to form a winding core.

[0003] It should be noted that in the winding core formed in this way, the leading end of the diaphragm needs to exceed the leading end of the positive electrode sheet or the negative electrode sheet, that is, when the positive electrode sheet or the negative electrode sheet is put into the sheet, it also needs to be corrected, resulting in low production efficiency of the equipment and low product yield.

[0004] Therefore, improvements are needed to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to at least partially solve the above problems, according to a first aspect of the present invention, a winding core structure is provided, which includes:

[0007] A negative electrode assembly, a positive electrode assembly and a separator are wound together, wherein the separator is located between the negative electrode assembly and the positive electrode assembly to insulate and separate the negative electrode assembly from the positive electrode assembly, the negative electrode assembly includes a negative electrode sheet, and the positive electrode assembly includes a positive electrode sheet;

[0008] Wherein, the negative electrode assembly further includes a first insulating member coated on the winding starting side of the negative electrode sheet and a second insulating member coated on the winding ending side of the negative electrode sheet, the winding starting end of the negative electrode assembly is located at the first insulating member, and the winding ending end of the negative electrode assembly is located at the second insulating member, and / or, the positive electrode assembly further includes a third insulating member coated on the winding starting side of the positive electrode sheet and a fourth insulating member coated on the winding ending side of the positive electrode sheet, the winding starting end of the positive electrode assembly is located at the third insulating member, and the winding ending end of the positive electrode assembly is located at the fourth insulating member; or, the negative electrode assembly The positive electrode assembly further comprises a first insulating member coated on the winding start side end of the negative electrode sheet, the positive electrode assembly further comprises a fourth insulating member coated on the winding end side of the positive electrode sheet, the winding start end of the negative electrode assembly is located at the first insulating member, and the winding end end of the positive electrode assembly is located at the fourth insulating member; or, the negative electrode assembly further comprises a second insulating member coated on the winding end side of the negative electrode sheet, the positive electrode assembly further comprises a third insulating member coated on the winding start side of the positive electrode sheet, the winding end end of the negative electrode assembly is located at the second insulating member, and the winding start end of the positive electrode assembly is located at the third insulating member;

[0009] The winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, and the winding starting end of the separator are aligned, and the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, and the winding ending end of the separator are aligned.

[0010] Exemplarily, the negative electrode assembly further includes a first insulating member coated on the winding start side of the negative electrode sheet and a second insulating member coated on the winding end side of the negative electrode sheet, the winding start end of the negative electrode assembly is located at the first insulating member, and the winding end end of the negative electrode assembly is located at the second insulating member, the positive electrode assembly further includes a third insulating member coated on the winding start side of the positive electrode sheet and a fourth insulating member coated on the winding end side of the positive electrode sheet, the winding start end of the positive electrode assembly is located at the third insulating member, and the winding end end of the positive electrode assembly is located at the fourth insulating member; the first insulating member includes a first part and a second part connected to each other, the first part is connected to the winding start end of the negative electrode sheet, the winding start end of the negative electrode assembly is located at the first part, and the second part is coated on the outer surface of the negative electrode sheet close to the first part;

[0011] The second insulating member includes a third portion and a fourth portion connected to each other, the third portion is connected to the winding tail end of the negative electrode plate, the winding tail end of the negative electrode assembly is located at the third portion, and the fourth portion is coated on the outer surface of the negative electrode plate close to the third portion;

[0012] The third insulating member includes a fifth portion and a sixth portion connected to each other, the fifth portion is connected to the winding start end of the positive electrode plate, the winding start end of the positive electrode assembly is located at the fifth portion, and the sixth portion is coated on the outer surface of the positive electrode plate close to the fifth portion;

[0013] The fourth insulating member includes a seventh part and an eighth part which are connected to each other, so that the seventh part is connected to the winding tail end of the positive electrode plate, the winding tail end of the positive electrode assembly is located in the seventh part, and the eighth part is coated on the outer surface of the positive electrode plate close to the seventh part.

[0014] Exemplarily, the length of the second portion of the first insulating member along the winding direction is 1 mm-20 mm;

[0015] The length of the fourth portion of the second insulating member along the winding direction is 1 mm-20 mm;

[0016] The length of the sixth portion of the third insulating member along the winding direction is 1 mm-20 mm;

[0017] The length of the eighth portion of the fourth insulating member along the winding direction is 1 mm-20 mm.

[0018] Exemplarily, the length of the first part of the first insulating member along the winding direction is 20 mm-150 mm;

[0019] The length of the third portion of the second insulating member along the winding direction is greater than or equal to 3 mm.

[0020] Exemplarily, the negative electrode assembly further includes a first insulating member coated on a first side of the negative electrode plate and a second insulating member coated on a second side of the negative electrode plate, and the positive electrode assembly further includes a third insulating member coated on a first side of the positive electrode plate and a fourth insulating member coated on a second side of the positive electrode plate;

[0021] The length of the first portion of the first insulating member along the winding direction is a first length, the length of the fifth portion of the third insulating member along the winding direction is a second length, the second length is greater than the first length, and the difference between the second length and the first length is greater than or equal to 5 mm;

[0022] The length of the third portion of the second insulating member along the winding direction is a third length, the length of the seventh portion of the fourth insulating member along the winding direction is a fourth length, the fourth length is greater than the third length, and the difference between the fourth length and the third length is greater than or equal to 5 mm.

[0023] Exemplarily, the negative electrode plate includes a first current collector and a first active material layer and a second active material layer located on both sides of the first current collector, and the positive electrode plate includes a second current collector and a third active material layer and a fourth active material layer located on both sides of the second current collector;

[0024] The first insulating member has two layers, the first portions of the two layers of the first insulating member are butted against each other, the second portion of one layer of the first insulating member is coated on the outer surface of the first active material layer on the side close to the first portion, and the second portion of the other layer of the first insulating member is coated on the outer surface of the second active material layer on the side close to the first portion;

[0025] The second insulating member has two layers, the third portions of the two layers of the second insulating member are butted against each other, the fourth portion of one layer of the second insulating member is coated on the outer surface of the first active material layer close to the third portion, and the fourth portion of the other layer of the second insulating member is coated on the outer surface of the second active material layer close to the third portion;

[0026] The third insulating member has two layers, and the fifth portions of the two layers of the third insulating member are butted against each other, the sixth portion of one layer of the third insulating member is coated on the outer surface of the third active material layer close to the fifth portion, and the sixth portion of the other layer of the third insulating member is coated on the outer surface of the fourth active material layer close to the fifth portion;

[0027] The fourth insulating member has two layers, and the seventh portions of the two layers of the fourth insulating member are butted against each other. The eighth portion of one layer of the fourth insulating member is coated on the outer surface of the third active material layer close to the seventh portion, and the eighth portion of the other layer of the fourth insulating member is coated on the outer surface of the fourth active material layer close to the seventh portion.

[0028] Exemplarily, the thickness of each layer of the first insulating member, each layer of the second insulating member, each layer of the third insulating member, and each layer of the fourth insulating member is 7 μm-20 μm.

[0029] Exemplarily, the separator includes a first separator and a second separator, and the winding core structure includes the negative electrode assembly, the first separator, the positive electrode assembly and the second separator which are sequentially stacked and wound from the inside to the outside; or, the winding core structure includes the first separator, the negative electrode assembly, the second separator and the positive electrode assembly which are sequentially stacked and wound from the inside to the outside; or, the winding core structure includes the first separator, the positive electrode assembly, the second separator and the negative electrode assembly which are sequentially stacked and wound from the inside to the outside; or, the winding core structure includes the positive electrode assembly, the first separator, the negative electrode assembly and the second separator which are sequentially stacked and wound from the inside to the outside.

[0030] Exemplarily, the outermost circle of the winding core structure is the second diaphragm, or the outermost circle of the winding core structure is the fourth insulating member, or the outermost circle of the winding core structure includes the negative electrode sheet and the second insulating member connected to the negative electrode sheet.

[0031] Exemplarily, the plane where the winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting section of the first separator and the winding starting end of the second separator are located is a first plane, and the plane where the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, the winding ending end of the first separator and the winding ending end of the second separator are located is a second plane, and the first plane and the second plane do not overlap.

[0032] According to a second aspect of the present invention, a battery is provided, which includes the winding core structure as described above.

[0033] According to a third aspect of the utility model, there is provided an electrical device comprising the battery as described above.

[0034] According to the winding core structure, battery and electrical equipment of the utility model, the winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting end of the first diaphragm and the winding starting end of the second diaphragm are flush, and the winding tail end of the negative electrode assembly, the winding tail end of the positive electrode assembly, the winding tail end of the first diaphragm and the winding tail end of the second diaphragm are flush. Such a structural arrangement can ensure that the positive electrode assembly, the negative electrode assembly, the first diaphragm and the second diaphragm can be basically fed into the winding core at the same time during the winding process, and then cut off from the adhesive tape after the winding is completed, thereby simplifying the production process and improving production efficiency. At the same time, there is no need to correct the deviation every time the positive and negative electrode assemblies are fed into the core, which can improve the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following drawings of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the device and principle of the present application. In the drawings,

[0036] Figure 1 is a schematic diagram of a winding core structure according to a first embodiment of the present application;

[0037] Figure 2 for Figure 1 A schematic side view of a negative electrode assembly in FIG.

[0038] Figure 3 for Figure 2 A schematic top view of a negative electrode assembly in FIG.

[0039] Figure 4 for Figure 1 A schematic side view of a positive electrode assembly in FIG.

[0040] Figure 5 for Figure 4 A schematic top view of a positive electrode assembly in FIG.

[0041] Figure 6 is a schematic diagram of a winding core structure according to a second embodiment of the present application;

[0042] Figure 7 is a schematic diagram of a winding core structure according to a third embodiment of the present application;

[0043] Figure 8 is a schematic diagram of a winding core structure according to a fourth embodiment of the present application;

[0044] Fig. 9 is a schematic diagram of a winding core structure according to a fifth embodiment of the present application;

[0045] Fig.10 is a schematic diagram of a winding core structure according to a sixth embodiment of the present application;

[0046] Fig.11 is a schematic diagram of a winding core structure according to a seventh embodiment of the present application;

[0047] Fig.12 is a schematic diagram of a winding core structure according to a seventh embodiment of the present application;

[0048] Fig.13 is a schematic diagram of a winding core structure according to a ninth embodiment of the present application;

[0049] Fig.14 is a schematic diagram of a winding core structure according to a tenth embodiment of the present application;

[0050] Fig.15 Schematic diagram of a winding core structure according to the eleventh embodiment of the present application.

[0051] Description of reference numerals:

[0052] 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J - negative electrode assembly;

[0053] 110, 110A, 110B, 110C, 110D, 110E, 110F, 110G, 110H, 110I, 110J-negative electrode;

[0054] 120, 120A, 120B, 120C, 120D, 120E, 120F, 120G, 120H, 120I - first insulating member;

[0055] 130, 130A, 130B, 130C, 130D, 130E, 130F, 130G, 130H, 130I - second insulating member;

[0056] 200, 200A, 200B, 200C, 200D, 200E, 200F, 200G, 200H, 200I, 200J - positive electrode assembly;

[0057] 210, 210A, 210B, 210C, 210D, 210E, 210F, 210G, 210H, 210I, 210J-positive electrode;

[0058] 220, 220A, 220B, 220C, 220D, 220E, 220F, 220G, 220H, 220J - third insulating member;

[0059] 230, 230A, 230B, 230C, 230D, 230E, 230F, 230G, 230H, 230J - fourth insulating member;

[0060] 300, 300A, 300B, 300C, 300D, 300E, 300F, 300G, 300H, 300I, 300J - first diaphragm;

[0061] 400, 400A, 400B, 400C, 400D, 400E, 400F, 400G, 400H, 400I, 400J - second diaphragm;

[0062] 111 - first current collector, 112 - first active material layer, 113 - second active material layer;

[0063] 211 - second current collector, 212 - third active material layer, 213 - fourth active material layer. DETAILED DESCRIPTION

[0064] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0065] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0066] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0067] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation shown in the figures.

[0068] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0069] Embodiments of the utility model are described herein with reference to cross-sectional views as schematic diagrams of ideal embodiments (and intermediate structures) of the present application. In this way, variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, the embodiments of the present application should not be limited to the specific shapes shown herein, but include shape deviations due to, for example, manufacturing. Therefore, what is shown in the figures is schematic in nature, and their shapes are not intended to display the actual shape of the device and are not intended to limit the scope of the present application.

[0070] See attached Figure 1 An exemplary winding core structure according to the first embodiment of the present application includes a negative electrode assembly 100, a positive electrode assembly 200 and a separator that are wound together. The separator is located between the negative electrode assembly 100 and the positive electrode assembly 200 to insulate and separate the negative electrode assembly 100 and the positive electrode assembly 200.

[0071] In the embodiment of the present application, the negative electrode assembly 100 includes a negative electrode sheet 110, a first insulating member 120 and a second insulating member 130. The first insulating member 120 is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110. Figure 1 The second insulating member 130 is wrapped around the winding end side of the negative electrode sheet 110 (i.e. Figure 1 The winding start end of the negative electrode assembly 100 is located at the first insulating member 120, and the winding end end of the negative electrode assembly 100 is located at the second insulating member 130. The positive electrode assembly 200 includes a positive electrode sheet 210, a third insulating member 220 and a fourth insulating member 230. The third insulating member 220 is coated on the winding start side of the positive electrode sheet 210 (i.e. Figure 1 The fourth insulating member 230 is coated on the winding end side of the positive electrode sheet 210 (i.e. Figure 1 The winding start end of the positive electrode assembly 200 is located at the third insulating member 220, and the winding end end of the positive electrode assembly 200 is located at the fourth insulating member 230. The separator includes a first separator 200 and a second separator 300. Before the winding core structure is wound, the first separator 300 is located between the negative electrode assembly 100 and the positive electrode assembly 200, and the second separator 400 is located on the side of the positive electrode assembly 200 away from the first separator 300. It should be noted that the first and second here are only used for distinction, and the first separator can also be called the second separator, and the second separator can also be called the first separator. That is, the winding core structure of the embodiment of the present application is formed by stacking the negative electrode assembly 100, the first separator 300, the positive electrode assembly 200 and the second separator 400 in the order of stacking from inside to outside and then winding counterclockwise, that is, the winding core structure includes the negative electrode assembly 100, the first separator 300, the positive electrode assembly 200 and the second separator 400 stacked and wound in sequence from inside to outside. The winding start end of the negative electrode assembly 100, the winding start end of the positive electrode assembly 200, the winding start end of the first separator 300 and the winding start end of the second separator 400 are flush, and the winding end end of the negative electrode assembly 100, the winding end end of the positive electrode assembly 200, the winding end end of the first separator 300 and the winding end end of the second separator 400 are flush. It should be noted that the winding core structure is formed by winding counterclockwise from inside to outside, the winding start end is an end located inside the winding core structure, and the winding end end is an end located outside the winding core structure. It should also be noted that the "flush" described in the context of this specification includes the situation of complete alignment and the situation of slight misalignment, for example, a slight misalignment within the range of 1 mm.

[0072] The manufacturing process of the winding core structure according to the present embodiment is as follows: First, the prepared positive electrode sheet 210, the first diaphragm 300, the negative electrode sheet 110 and the second diaphragm 400 are placed on their respective unwinding rollers for feeding. During the movement, the positive electrode sheet 210 will be moved to a specific length according to actual needs, and then the positive electrode sheet 210 will be cut, and then the positive electrode sheet 210 will be moved to a specific length and then an insulating member will be pasted to connect the two sections of the positive electrode sheet 210 to ensure the continuity of the positive electrode sheet 210 during the subsequent movement. The negative electrode sheet 110 can be implemented in the same way as the positive electrode sheet 210. Then the positive electrode sheet 210 after the insulating member is pasted, the first diaphragm 300, the negative electrode sheet 110 after the insulating member is pasted, and the second diaphragm 400 are respectively put into the winding needle for winding. It should be noted that the insulating part at the starting end of the positive electrode sheet 210, the insulating part at the starting end of the negative electrode sheet 110, the starting end of the first diaphragm 300, and the starting end of the second diaphragm 400 are flush. After winding to a specific size, the positive electrode sheet 210, the first diaphragm 300, the negative electrode sheet 110, and the second diaphragm 400 after the insulating part is pasted are cut off at the same time by a cutting device, and then the tail insulating part is pasted at the tail end of the winding core for fixing. It should be noted that the position where the cutting device cuts the electrode sheet is the position where the insulating part is pasted, that is, the cutting device will not cut the area with active material on the electrode sheet. In the winding core prepared in this way, the terminal end of the insulating part is flush with the terminal end of the diaphragm, and for the next winding core, the starting end of the insulating part at the front end of the electrode sheet is flush with the starting end of the diaphragm. That is, in the obtained winding core structure, the first insulating member 120 is away from one end of the negative electrode sheet 110, the third insulating member 220 is away from one end of the positive electrode sheet 210, the first end of the first diaphragm 300 is flush with the first end of the second diaphragm 400, and the second insulating member 130 is away from one end of the negative electrode sheet 110, the fourth insulating member 230 is away from one end of the positive electrode sheet 210, the second end of the first diaphragm 300 is flush with the second end of the second diaphragm 400. According to the winding core structure of the present application, it can be ensured that the positive electrode assembly 200, the negative electrode assembly 100, the first diaphragm 300 and the second diaphragm 400 can be fed into the winding core at the same time during the winding process, and then cut off from the insulating member after the winding is completed. This one-time cutting method can simplify the production process and improve production efficiency. At the same time, there is no need to correct the deviation every time the positive and negative electrode assemblies 100 are fed, which can improve the product yield.

[0073] See attached Figure 2-5In the embodiment of the present application, the first insulating member 120 includes a first part and a second part that are connected to each other, the first part is connected to the winding starting end of the negative electrode sheet 110, the winding starting end of the negative electrode assembly 100 is located in the first part, and the second part is coated on the outer surface of the negative electrode sheet 110 close to the first part. The second insulating member 130 includes a third part and a fourth part that are connected to each other, the third part is connected to the winding ending end of the negative electrode sheet 110, the winding ending end of the negative electrode assembly 100 is located in the third part, and the fourth part is coated on the outer surface of the negative electrode sheet 110 close to the third part.

[0074] Specifically, the negative electrode plate 110 includes a first current collector 111 and a first active material layer 112 and a second active material layer 113 located on both sides of the first current collector 111. The first current collector 111 may be a copper foil, which is used to collect and output the current generated by the first active material layer 112 and the second active material layer 113, and input the electrode current to the first active material layer 112 and the second active material layer 113. The first insulating member 120 has two layers, and the first portions of the two layers of the first insulating member 120 are butted against each other, and the second portion of one layer of the first insulating member 120 is coated on the outer surface of the first active material layer 112 on the side close to the first portion, and the second portion of the other layer of the first insulating member 120 is coated on the outer surface of the second active material layer 113 on the side close to the first portion. The second insulating member 130 has two layers, and the third portions of the two layers of the second insulating member 130 are butted against each other. The fourth portion of one layer of the second insulating member 130 is coated on the outer surface of the first active material layer 112 close to the third portion, and the fourth portion of the other layer of the second insulating member 130 is coated on the outer surface of the second active material layer 114 close to the third portion.

[0075] The positive electrode sheet 210 includes a second current collector 211 and a third active material layer 212 and a fourth active material layer 213 located on both sides of the second current collector 211. The second current collector 211 may be an aluminum foil, which is used to collect and output the current generated by the third active material layer 212 and the fourth active material layer 213, and input the electrode current to the third active material layer 212 and the fourth active material layer 213. The third insulating member 220 has two layers, and the fifth portions of the two layers of the third insulating member 220 are butted against each other, and the sixth portion of one layer of the third insulating member 220 is coated on the outer surface of the third active material layer 212 on the side close to the fifth portion, and the sixth portion of the other layer of the third insulating member 220 is coated on the outer surface of the fourth active material layer 213 on the side close to the fifth portion. The fourth insulating member 230 has two layers, and the seventh portions of the two layers of the fourth insulating member 230 are butted against each other. The eighth portion of one layer of the fourth insulating member 230 is coated on the outer surface of the third active material layer 212 close to the seventh portion, and the eighth portion of the other layer of the fourth insulating member 230 is coated on the outer surface of the fourth active material layer 213 close to the seventh portion.

[0076] The thickness H of each layer of the first insulating member 120, each layer of the second insulating member 130, each layer of the third insulating member 220 and each layer of the fourth insulating member 230 is 7μm-20μm, that is, 7μm≤H≤20μm. If the thickness H of the insulating member is too small, the mechanical strength of the insulating member is insufficient, and the band may be broken during the movement of the pole piece; if H is too large, the step height formed between the insulating member and the pole piece surface is too large, which is not conducive to the contact between the pole piece and the diaphragm. It should be noted that the thickness of the first insulating member 120, the second insulating member 130, the third insulating member 220 and the fourth insulating member 230 can be the same or different, and is not limited here. The first insulating member 120, the second insulating member 130, the third insulating member 220 and the fourth insulating member 230 can be adhesive tape, and its specific material can be a mixture of one or more of polyamide, polyurethane, polyethylene, polypropylene, polyacrylic acid, polyvinyl alcohol, epoxy resin, organic silicone, and polyphenylene sulfide.

[0077] See attached Figure 3 , 5In the embodiment of the present application, the length of the second part of the first insulating member 120 along the winding direction is W1, that is, the length of the overlapping area of ​​the first insulating member 120 and the first active material layer 112 and the second active material layer 113 is W1, that is, the length of the second part of the first insulating member 120 in the first layer and the length of the second part of the first insulating member 120 in the second layer are equal and both are W1. The length of the fourth part of the second insulating member 130 along the winding direction is W3, that is, the length of the overlapping area of ​​the second insulating member 130 and the first active material layer 112 and the second active material layer 113 is W3, that is, the length of the fourth part of the first insulating member 130 in the winding direction and the length of the second part of the second insulating member 130 in the second layer are equal and both are W3. W1 and W3 are both 1mm-20mm, that is, 1mm≤W1≤20mm, 1mm≤W3≤20mm. If W1 and W3 are too small, the first insulating member 120 and the second insulating member 130 will not be firmly attached to the negative electrode sheet 110, and the negative electrode sheet 110 may be easily broken during the movement of the negative electrode sheet 110; if W1 and W3 are too large, the loss of active materials will increase, reducing the utilization rate of the active material layer of the negative electrode sheet 110 and the energy density of the battery. Similarly, the length of the sixth part of the third insulating member 220 along the winding direction is W2, and the length of the eighth part of the fourth insulating member 230 along the winding direction is W4. Both W2 and W4 are 1mm-20mm, which will not be described in detail here. In some other embodiments, the length of the second part of the first-layer first insulating member 120 along the winding direction and the length of the second part of the second-layer first insulating member 120 along the winding direction may be configured to be unequal, or the length of the fourth part of the first-layer second insulating member 130 along the winding direction and the length of the fourth part of the second-layer second insulating member 130 along the winding direction may be configured to be unequal, or the length of the sixth part of the first-layer third insulating member 220 along the winding direction and the length of the sixth part of the second-layer third insulating member 220 along the winding direction may be configured to be unequal, or the length of the eighth part of the first-layer fourth insulating member 230 along the winding direction and the length of the eighth part of the second-layer fourth insulating member 230 along the winding direction may be configured to be unequal.

[0078] See attached Figure 3 , 5In the embodiment of the present application, the length of the first part of the first insulating member 120 along the winding direction is the first length L1, that is, the length of the part of the first insulating member 120 that does not overlap with the first active material layer 112 and the second active material layer 113 is L1, that is, the length of the first part of the first insulating member 120 of the first layer along the winding direction and the length of the first part of the second insulating member 120 along the winding direction are both L1. L1 is 20mm-150mm, that is, 20mm≤L1≤150mm. In this way, when cutting the insulating member and the separator, sufficient size space can be reserved for operation. At the same time, the first insulating member 120 can also increase the compressive strength of the center hole of the winding core to prevent the battery from collapsing at the center hole during the cycle. The length of the third portion of the second insulating member 130 along the winding direction is the third length L3, that is, the length of the portion of the second insulating member 130 that does not overlap with the first active material layer 112 and the second active material layer 113 is L3, that is, the length of the third portion of the first layer of the second insulating member 130 along the winding direction and the length of the third portion of the second layer of the second insulating member 130 along the winding direction are both L3. L3 is greater than or equal to 3 mm. With such a setting, when cutting the insulating member and the separator, sufficient size space can be reserved for cutting operations.

[0079] In the embodiment of the present application, the length of the fifth portion of the third insulating member 220 along the winding direction is the second length L2, that is, the length of the portion of the third insulating member 220 that does not overlap with the third active material layer 212 and the fourth active material layer 213 is L2, that is, the length of the fifth portion of the first layer of the third insulating member 220 along the winding direction and the length of the fifth portion of the second layer of the third insulating member 220 along the winding direction are both L2. L2 is greater than L1, and the difference between L2 and L1 is greater than or equal to 5mm. The length of the seventh portion of the fourth insulating member 230 along the winding direction is the fourth length L4, that is, the length of the portion of the fourth insulating member 230 that does not overlap with the third active material layer 212 and the fourth active material layer 213 is L4, that is, the length of the seventh portion of the first layer of the fourth insulating member 230 along the winding direction and the length of the seventh portion of the second layer of the fourth insulating member 230 along the winding direction are both L4. L4 is greater than L3, and the difference between L4 and L3 is greater than or equal to 5mm. Through such an arrangement, the projection of the positive electrode active material layer (i.e., the third active material layer 212 and the fourth active material layer 213) on the negative electrode plate 110 can be within the negative electrode active material layer (i.e., the first active material layer 112 and the second active material layer 113), that is, the active material layer on the negative electrode plate 110 can completely cover the positive electrode active material layer, thereby avoiding lithium plating during the charge and discharge cycle of the battery.

[0080] See attached Figure 1In the embodiment of the present application, the plane where the winding start end of the negative electrode assembly 100, the winding start end of the positive electrode assembly 200, the first end of the first separator 300 and the first end of the second separator 400 are located is the first plane (i.e. Figure 1 The plane along the horizontal direction in the middle), the plane where the winding tail end of the negative electrode assembly 100, the winding tail end of the positive electrode assembly 200, the second end of the first separator 300 and the second end of the second separator 400 are located is the second plane (that is, Figure 1 The first plane and the second plane do not overlap. This arrangement can prevent the winding start end and the winding end of the winding core structure from being on the same plane, thereby improving the roundness of the winding core.

[0081] See attached Figure 1 In the embodiment of the present application, the outermost circle of the core structure is the second diaphragm 400. When the shell of the battery with the core structure is charged, the positive electrode sheet 210 or the negative electrode sheet 110 can be prevented from contacting the battery shell, thereby avoiding a short circuit in the battery.

[0082] Refer to the attached Figure 6 The winding core structure according to the second embodiment of the present application is exemplified. The winding core structure includes a negative electrode assembly 100A, a positive electrode assembly 200A and a separator that are wound. The separator is located between the negative electrode assembly 100A and the positive electrode assembly 200A to insulate and separate the negative electrode assembly 100A and the positive electrode assembly 200A. The negative electrode assembly 100A includes a negative electrode sheet 110A, a first insulating member 120A and a second insulating member 130A. The first insulating member 120A is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110A. Figure 1 The second insulating member 130A is wrapped around the winding end side of the negative electrode sheet 110A (i.e. Figure 1 The winding start end of the negative electrode assembly 100A is located at the first insulating member 120A, and the winding end end of the negative electrode assembly 100A is located at the second insulating member 130A. The positive electrode assembly 200A includes a positive electrode sheet 210A, a third insulating member 220A, and a fourth insulating member 230A. The third insulating member 220A is coated on the winding start side of the positive electrode sheet 210A (i.e. Figure 1 The fourth insulating member 230A is coated on the winding end side of the positive electrode sheet 210A (i.e. Figure 1The winding start end of the positive electrode assembly 200A is located at the third insulating member 220A, and the winding end end of the positive electrode assembly 200A is located at the fourth insulating member 230A. The separator includes a first separator 200A and a second separator 300A. Before the winding of the core structure, the first separator 300A is located between the negative electrode assembly 100A and the positive electrode assembly 200A, and the second separator 400A is located on the side of the negative electrode assembly 100A away from the first separator 300A. That is, the core structure of the embodiment of the present application is formed by stacking the positive electrode assembly 200A, the first separator 300A, the negative electrode assembly 100A and the second separator 400A from inside to outside in sequence and then winding counterclockwise, that is, the core structure includes the positive electrode assembly 200A, the first separator 300A, the negative electrode assembly 100A and the second separator 400A, which are stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100A, the winding start end of the positive electrode assembly 200A, the winding start end of the first separator 300A and the winding start end of the second separator 400A are flush, and the winding end end of the negative electrode assembly 100A, the winding end end of the positive electrode assembly 200A, the winding end end of the first separator 300A and the winding end end of the second separator 400A are flush. Among them, the outermost circle of the winding core structure is the second separator 400A. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210A or the negative electrode sheet 110A from contacting the battery shell, avoiding a short circuit in the battery.

[0083] See attached Figure 7 The winding core structure according to the third embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100A, a positive electrode assembly 200A and a separator that are wound. The separator is located between the negative electrode assembly 100A and the positive electrode assembly 200A to insulate and separate the negative electrode assembly 100A and the positive electrode assembly 200A. The negative electrode assembly 100B includes a negative electrode sheet 110B, a first insulating member 120B and a second insulating member 130B. The first insulating member 120B is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110B. Figure 1 The second insulating member 130B is coated on the winding end side of the negative electrode sheet 110B (i.e. Figure 1 The winding start end of the negative electrode assembly 100B is located at the first insulating member 120B, and the winding end end of the negative electrode assembly 100B is located at the second insulating member 130B. The positive electrode assembly 200B includes a positive electrode sheet 210B, a third insulating member 220B and a fourth insulating member 230B. The third insulating member 220B is coated on the winding start side of the positive electrode sheet 210B (i.e. Figure 1 The fourth insulating member 230B is coated on the winding end side of the positive electrode sheet 210B (i.e. Figure 1The first separator 300B is located between the negative electrode assembly 100B and the positive electrode assembly 200B, and the second separator 400B is located on the side of the positive electrode assembly 200B away from the first separator 300B. That is, the winding core structure of the embodiment of the present application is formed by stacking the second separator 400B, the positive electrode assembly 200B, the first separator 300B and the negative electrode assembly 100B in sequence from inside to outside and then winding counterclockwise, that is, the winding core structure includes the second separator 400B, the positive electrode assembly 200B, the first separator 300B and the negative electrode assembly 100B stacked and wound in sequence from inside to outside. The winding start end of the negative electrode assembly 100B, the winding start end of the positive electrode assembly 200B, the winding start end of the first separator 300B and the winding start end of the second separator 400B are flush, and the winding end end of the negative electrode assembly 100B, the winding end end of the positive electrode assembly 200B, the winding end end of the first separator 300B and the winding end end of the second separator 400B are flush. Among them, the outermost circle of the core structure includes a negative electrode sheet 110B and a second insulating member 130B connected to the negative electrode sheet 110B, and the length of the negative electrode sheet 110B in the outermost circle is greater than three quarters or four fifths or other suitable proportions. The core structure of this embodiment can be applied to cylindrical batteries in which part of the shell is not charged or the shell is negatively charged.

[0084] Refer to the attached Figure 8 The winding core structure according to the fourth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100C, a positive electrode assembly 200C and a separator that are wound. The separator is located between the negative electrode assembly 100C and the positive electrode assembly 200C to insulate and separate the negative electrode assembly 100C and the positive electrode assembly 200C. The negative electrode assembly 100C includes a negative electrode sheet 110C, a first insulating member 120C and a second insulating member 130C. The first insulating member 120C is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110C. Figure 1 The second insulating member 130C is wrapped around the winding end side of the negative electrode sheet 110C (i.e. Figure 1 The winding start end of the negative electrode assembly 100C is located at the first insulating member 120C, and the winding end end of the negative electrode assembly 100C is located at the second insulating member 130C. The positive electrode assembly 200C includes a positive electrode sheet 210C, a third insulating member 220C, and a fourth insulating member 230C. The third insulating member 220C is coated on the winding start side of the positive electrode sheet 210C (i.e., Figure 1 The fourth insulating member 230C is coated on the winding end side of the positive electrode sheet 210C (i.e. Figure 1The winding start end of the positive electrode assembly 200C is located at the third insulating member 220C, and the winding end end of the positive electrode assembly 200C is located at the fourth insulating member 230C. The separator includes a first separator 200C and a second separator 300C. Before the winding of the core structure, the first separator 300C is located between the negative electrode assembly 100C and the positive electrode assembly 200C, and the second separator 400C is located on the side of the negative electrode assembly 100C away from the first separator 300C. That is, the core structure of the embodiment of the present application is formed by stacking the second separator 400C, the negative electrode assembly 100C, the first separator 300C and the positive electrode assembly 200C in the order from inside to outside and then winding counterclockwise, that is, the core structure includes the second separator 400C, the negative electrode assembly 100C, the first separator 300C and the positive electrode assembly 200C stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100C, the winding start end of the positive electrode assembly 200C, the winding start end of the first separator 300C and the winding start end of the second separator 400C are flush, and the winding end end of the negative electrode assembly 100C, the winding end end of the positive electrode assembly 200C, the winding end end of the first separator 300C and the winding end end of the second separator 400C are flush. Among them, the outermost circle of the winding core structure is the fourth insulating member 230C. In this way, when the shell of the battery with the winding core structure is charged, the positive electrode sheet 210C or the negative electrode sheet 110C can be prevented from contacting the battery shell, avoiding a short circuit in the battery. It should be noted that the length L4 of the seventh part of the fourth insulating member 230C along the winding direction can be at least one circle larger than the length L3 of the third part of the second insulating member 130C along the winding direction.

[0085] Refer to the attached Fig. 9 The winding core structure according to the fifth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100D, a positive electrode assembly 200D and a separator that are wound. The separator is located between the negative electrode assembly 100D and the positive electrode assembly 200D to insulate and separate the negative electrode assembly 100D and the positive electrode assembly 200D. In the embodiment of the present application, the negative electrode assembly 100D includes a negative electrode sheet 110D, a first insulating member 120D and a second insulating member 130D. The first insulating member 120D is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110D. Figure 1 The second insulating member 130D is wrapped around the winding end side of the negative electrode sheet 110D (i.e. Figure 1 The winding start end of the negative electrode assembly 100D is located at the first insulating member 120D, and the winding end end of the negative electrode assembly 100D is located at the second insulating member 130D. The positive electrode assembly 200D includes a positive electrode sheet 210D, a third insulating member 220D, and a fourth insulating member 230D. The third insulating member 220D is coated on the winding start side of the positive electrode sheet 210D (i.e. Figure 1 The fourth insulating member 230D is coated on the winding end side of the positive electrode sheet 210D (i.e. Figure 1 The winding start end of the positive electrode assembly 200D is located at the third insulating member 220D, and the winding end end of the positive electrode assembly 200D is located at the fourth insulating member 230D. The diaphragm includes a first diaphragm 200D and a second diaphragm 300D. Before the winding of the core structure, the first diaphragm 300D is located between the negative electrode assembly 100D and the positive electrode assembly 200D, and the second diaphragm 400D is located on the side of the positive electrode assembly 200D away from the first diaphragm 300D. In other words, the core structure of the embodiment of the present application is formed by stacking the negative electrode assembly 100D, the first diaphragm 300D, the positive electrode assembly 200D and the second diaphragm 400D in the order from inside to outside and then winding clockwise, that is, the core structure includes the negative electrode assembly 100D, the first diaphragm 300D, the positive electrode assembly 200D and the second diaphragm 400D stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100D, the winding start end of the positive electrode assembly 200D, the winding start end of the first separator 300D, and the winding start end of the second separator 400D are flush, and the winding end end of the negative electrode assembly 100D, the winding end end of the positive electrode assembly 200D, the winding end end of the first separator 300D, and the winding end end of the second separator 400D are flush. Among them, the outermost circle of the winding core structure is the second separator 400D. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210D or the negative electrode sheet 110D from contacting the battery shell, avoiding a short circuit in the battery.

[0086] Refer to the attached Fig.10 The winding core structure according to the sixth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100E, a positive electrode assembly 200E and a separator that are wound. The separator is located between the negative electrode assembly 100E and the positive electrode assembly 200E to insulate and separate the negative electrode assembly 100E and the positive electrode assembly 200E. The negative electrode assembly 100E includes a negative electrode sheet 110E, a first insulating member 120E and a second insulating member 130E. The first insulating member 120E is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110E. Figure 1 The second insulating member 130E is wrapped around the winding end side of the negative electrode sheet 110E (i.e. Figure 1 The winding start end of the negative electrode assembly 100E is located at the first insulating member 120E, and the winding end end of the negative electrode assembly 100E is located at the second insulating member 130E. The positive electrode assembly 200E includes a positive electrode sheet 210E, a third insulating member 220E, and a fourth insulating member 230E. The third insulating member 220E is coated on the winding start side of the positive electrode sheet 210E (i.e. Figure 1The fourth insulating member 230E is coated on the winding end side of the positive electrode sheet 210E (i.e. Figure 1 The winding start end of the positive electrode assembly 200E is located at the third insulating member 220E, and the winding end end of the positive electrode assembly 200E is located at the fourth insulating member 230E. The separator includes a first separator 200E and a second separator 300E. Before the winding of the core structure, the first separator 300E is located between the negative electrode assembly 100E and the positive electrode assembly 200E, and the second separator 400E is located on the side of the negative electrode assembly 100E away from the first separator 300E. That is, the core structure of the embodiment of the present application is formed by stacking the positive electrode assembly 200E, the first separator 300E, the negative electrode assembly 100E and the second separator 400E from inside to outside in sequence and then winding clockwise, that is, the core structure includes the positive electrode assembly 200E, the first separator 300E, the negative electrode assembly 100E and the second separator 400E stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100E, the winding start end of the positive electrode assembly 200E, the winding start end of the first separator 300E and the winding start end of the second separator 400E are flush, and the winding end end of the negative electrode assembly 100E, the winding end end of the positive electrode assembly 200E, the winding end end of the first separator 300E and the winding end end of the second separator 400E are flush. Among them, the outermost circle of the winding core structure is the second separator 400E. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210E or the negative electrode sheet 110E from contacting the battery shell, avoiding a short circuit in the battery.

[0087] Refer to the attached Fig.11 The winding core structure according to the seventh embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100F, a positive electrode assembly 200F and a separator that are wound. The separator is located between the negative electrode assembly 100F and the positive electrode assembly 200F to insulate and separate the negative electrode assembly 100F and the positive electrode assembly 200F. The negative electrode assembly 100F includes a negative electrode sheet 110F, a first insulating member 120F and a second insulating member 130F. The first insulating member 120F is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110F. Figure 1 The second insulating member 130F is wrapped around the winding end side of the negative electrode sheet 110F (i.e. Figure 1 The winding start end of the negative electrode assembly 100F is located at the first insulating member 120F, and the winding end end of the negative electrode assembly 100F is located at the second insulating member 130F. The positive electrode assembly 200F includes a positive electrode sheet 210F, a third insulating member 220F, and a fourth insulating member 230F. The third insulating member 220F is coated on the winding start side of the positive electrode sheet 210F (i.e. Figure 1The fourth insulating member 230F is coated on the winding end side of the positive electrode sheet 210F (i.e. Figure 1 The winding start end of the positive electrode assembly 200F is located at the third insulating member 220F, and the winding end end of the positive electrode assembly 200F is located at the fourth insulating member 230F. The separator includes a first separator 200F and a second separator 300F. Before the winding of the core structure, the first separator 300F is located between the negative electrode assembly 100F and the positive electrode assembly 200F, and the second separator 400F is located on the side of the positive electrode assembly 200F away from the first separator 300F. That is, the core structure of the embodiment of the present application is formed by stacking the second separator 400F, the positive electrode assembly 200F, the first separator 300F and the negative electrode assembly 100F in the order from inside to outside and then winding clockwise, that is, the core structure includes the second separator 400F, the positive electrode assembly 200F, the first separator 300F and the negative electrode assembly 100F, which are stacked and wound in sequence from inside to outside. The winding start end of the negative electrode assembly 100F, the winding start end of the positive electrode assembly 200F, the winding start end of the first separator 300F and the winding start end of the second separator 400F are flush, and the winding end end of the negative electrode assembly 100F, the winding end end of the positive electrode assembly 200F, the winding end end of the first separator 300F and the winding end end of the second separator 400F are flush. Among them, the outermost circle of the core structure is the negative electrode sheet 110F. It should be noted that the outermost circle mentioned here includes the negative electrode sheet 110F and the second insulating member 130F connected to the negative electrode sheet 110F. The length of the negative electrode sheet 110F in the outermost circle is greater than three quarters or four fifths or other suitable proportions. The core structure of this embodiment can be applied to batteries in which part of the shell is not charged or the shell is negatively charged.

[0088] See attached Fig.12 The winding core structure according to the eighth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100G, a positive electrode assembly 200G and a separator that are wound. The separator is located between the negative electrode assembly 100G and the positive electrode assembly 200G to insulate and separate the negative electrode assembly 100G and the positive electrode assembly 200G. The negative electrode assembly 100G includes a negative electrode sheet 110G, a first insulating member 120G and a second insulating member 130G. The first insulating member 120G is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110G. Figure 1 The second insulating member 130G is coated on the winding end side of the negative electrode sheet 110G (i.e. Figure 1The winding start end of the negative electrode assembly 100G is located at the first insulating member 120G, and the winding end end of the negative electrode assembly 100G is located at the second insulating member 130G. The positive electrode assembly 200G includes a positive electrode sheet 210G, a third insulating member 220G, and a fourth insulating member 230G. The third insulating member 220G is coated on the winding start side of the positive electrode sheet 210G (that is, Figure 1 The fourth insulating member 230G is coated on the winding end side of the positive electrode sheet 210G (i.e. Figure 1 The winding start end of the positive electrode assembly 200G is located at the third insulating member 220G, and the winding end end of the positive electrode assembly 200G is located at the fourth insulating member 230G. The separator includes a first separator 200G and a second separator 300G. Before the winding of the core structure, the first separator 300G is located between the negative electrode assembly 100G and the positive electrode assembly 200G, and the second separator 400G is located on the side of the negative electrode assembly 100G away from the first separator 300G. That is, the core structure of the embodiment of the present application is formed by stacking the second separator 400G, the negative electrode assembly 100G, the first separator 300G and the positive electrode assembly 200G in the order from inside to outside and then winding clockwise, that is, the core structure includes the second separator 400G, the negative electrode assembly 100G, the first separator 300G and the positive electrode assembly 200G, which are stacked and wound in sequence from inside to outside. The winding start end of the negative electrode assembly 100G, the winding start end of the positive electrode assembly 200G, the winding start end of the first separator 300G and the winding start end of the second separator 400G are flush, and the winding end end of the negative electrode assembly 100G, the winding end end of the positive electrode assembly 200G, the winding end end of the first separator 300G and the winding end end of the second separator 400G are flush. Among them, the outermost circle of the core structure is the fourth insulating member 230G. When it is arranged in this way, when the shell of the battery with the core structure is charged, it can prevent the positive electrode sheet 210G or the negative electrode sheet 110G from contacting the battery shell, avoiding a short circuit in the battery. It should be noted that the length L4 of the seventh part of the fourth insulating member 230G along the winding direction can be at least one circle larger than the length L3 of the third part of the second insulating member 130G along the winding direction.

[0089] See attached Fig.13 The winding core structure according to the ninth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100H, a positive electrode assembly 200H and a separator that are wound. The separator is located between the negative electrode assembly 100H and the positive electrode assembly 200H to insulate and separate the negative electrode assembly 100H and the positive electrode assembly 200H. The negative electrode assembly 100H includes a negative electrode sheet 110H, a first insulating member 120H and a second insulating member 130H. The first insulating member 120H is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110H. Figure 1The second insulating member 130H is coated on the winding end side of the negative electrode sheet 110H (i.e. Figure 1 The winding start end of the negative electrode assembly 100H is located at the first insulating member 120H, and the winding end end of the negative electrode assembly 100H is located at the second insulating member 130H. The positive electrode assembly 200H includes a positive electrode sheet 210H, a third insulating member 220H, and a fourth insulating member 230H. The third insulating member 220H is coated on the winding start side of the positive electrode sheet 210H (i.e. Figure 1 The fourth insulating member 230H is coated on the winding end side of the positive electrode sheet 210H (i.e. Figure 1 The winding start end of the positive electrode assembly 200H is located at the third insulating member 220H, and the winding end end of the positive electrode assembly 200H is located at the fourth insulating member 230H. The separator includes a first separator 200H and a second separator 300H. Before the winding of the core structure, the first separator 300H is located between the negative electrode assembly 100H and the positive electrode assembly 200H, and the second separator 400H is located on the side of the positive electrode assembly 200H away from the first separator 300H. That is, the core structure of the embodiment of the present application is formed by stacking the negative electrode assembly 100H, the first separator 300H, the positive electrode assembly 200H and the second separator 400H from inside to outside in sequence and then winding counterclockwise, that is, the core structure includes the negative electrode assembly 100H, the first separator 300H, the positive electrode assembly 200H and the second separator 400H, which are stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100H, the winding start end of the positive electrode assembly 200H, the winding start end of the first separator 300H, and the winding start end of the second separator 400H are flush, and the winding end end of the negative electrode assembly 100H, the winding end end of the positive electrode assembly 200H, the winding end end of the first separator 300H, and the winding end end of the second separator 400H are flush. Among them, the outermost circle of the winding core structure is the second separator 400H. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210H or the negative electrode sheet 110H from contacting the battery shell, avoiding a short circuit in the battery.

[0090] See attached Fig.14 The winding core structure according to the tenth embodiment of the present application is exemplarily described. The winding core structure includes a negative electrode assembly 100I, a positive electrode assembly 200I and a separator that are wound. The separator is located between the negative electrode assembly 100I and the positive electrode assembly 200I to insulate and separate the negative electrode assembly 100I and the positive electrode assembly 200I. The negative electrode assembly 100I includes a negative electrode sheet 110I, a first insulating member 120I and a second insulating member 130I. The first insulating member 120I is coated on the winding start side (i.e., the winding start side) of the negative electrode sheet 110I. Figure 1The second insulating member 130I is coated on the winding end side of the negative electrode sheet 110I (i.e. Figure 1 The winding start end of the negative electrode assembly 100I is located at the first insulating member 120I, and the winding end end of the negative electrode assembly 100I is located at the second insulating member 130I. The positive electrode assembly 200I includes a positive electrode sheet 210I, the winding start end of the positive electrode assembly 200I is the winding start end of the positive electrode sheet 210I, and the winding end end of the positive electrode assembly 200I is the winding end end of the positive electrode sheet 210I. The diaphragm includes a first diaphragm 200I and a second diaphragm 300I. Before the core structure is wound, the first diaphragm 300I is located between the negative electrode assembly 100I and the positive electrode assembly 200I, and the second diaphragm 400I is located on the side of the positive electrode assembly 200I away from the first diaphragm 300I. That is, the core structure of the embodiment of the present application is formed by stacking the negative electrode assembly 100I, the first diaphragm 300I, the positive electrode assembly 200I and the second diaphragm 400I in sequence from the inside to the outside and then winding counterclockwise. That is, the core structure includes the negative electrode assembly 100I, the first diaphragm 300I, the positive electrode assembly 200I and the second diaphragm 400I which are stacked and wound in sequence from the inside to the outside. The winding start end of the negative electrode assembly 100I, the winding start end of the first separator 300I, and the winding start end of the second separator 400I are substantially flush, and the winding end end of the negative electrode assembly 100I, the winding end end of the first separator 300I, and the winding end end of the second separator 400I are flush. Among them, the outermost circle of the winding core structure is the second separator 400I. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210I or the negative electrode sheet 110I from contacting the battery shell, avoiding a short circuit in the battery.

[0091] It should be noted that, according to the winding core structure of this embodiment, when winding, the positive electrode sheet 210I is not put into the sheet together with the first separator 300I, the second separator 400I and the negative electrode assembly 100I, and the positive electrode sheet 210I needs to be put into the sheet after the negative electrode assembly 100I is put into the sheet, so as to ensure that the projection of the positive electrode active material layer on the negative electrode sheet 110I is within the negative electrode active material layer, that is, the active material layer on the negative electrode sheet 110I can completely cover the positive electrode active material layer, so as to avoid lithium deposition during the charge and discharge cycle of the battery with the winding core structure. Accordingly, the positive electrode sheet 210I needs to be cut off in advance at the end of winding, and then the negative electrode assembly 100I, the first separator 300I and the second separator 400I are cut at the same time.

[0092] Refer to the attached Fig.15An exemplary description is given of the winding core structure according to the eleventh embodiment of the present application, which includes a negative electrode assembly 100J, a positive electrode assembly 200J and a separator that are wound together. The separator is located between the negative electrode assembly 100J and the positive electrode assembly 200J to insulate and separate the negative electrode assembly 100J and the positive electrode assembly 200J. The negative electrode assembly 100J includes a negative electrode sheet 110J. The winding starting end of the negative electrode assembly 100A is the winding starting end of the negative electrode sheet 110J, and the winding ending end of the negative electrode assembly 100A is the winding ending end of the negative electrode sheet 110J. The positive electrode assembly 200J includes a positive electrode sheet 210J, a third insulating member 220J and a fourth insulating member 230J. The third insulating member 220J is coated on the winding starting side (i.e., the winding ending side) of the positive electrode sheet 210J. Figure 1 The fourth insulating member 230J is coated on the winding end side of the positive electrode sheet 210J (i.e. Figure 1 The winding start end of the positive electrode assembly 200J is located at the third insulating member 220J, and the winding end end of the positive electrode assembly 200J is located at the fourth insulating member 230J. The separator includes a first separator 200J and a second separator 300J. Before the winding of the core structure, the first separator 300J is located between the negative electrode assembly 100J and the positive electrode assembly 200J, and the second separator 400J is located on the side of the positive electrode assembly 200J away from the first separator 300J. That is, the core structure of the embodiment of the present application is formed by stacking the second separator 400J, the positive electrode assembly 200J, the first separator 300J and the negative electrode assembly 100J in sequence from inside to outside and then winding counterclockwise, that is, the core structure includes the second separator 400J, the positive electrode assembly 200J, and the first separator 300J stacked and wound from inside to outside. The winding start end of the negative electrode assembly 100J, the winding start end of the positive electrode assembly 200J, the winding start end of the first separator 300J and the winding start end of the second separator 400J are flush, and the winding end end of the negative electrode assembly 100J, the winding end end of the positive electrode assembly 200J, the winding end end of the first separator 300J and the winding end end of the second separator 400J are flush. Among them, the outermost circle of the winding core structure is the second separator 400J. In this way, when the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet 210J or the negative electrode sheet 110J from contacting the battery shell, avoiding a short circuit in the battery.

[0093] It should be noted that, according to the winding core structure of this embodiment, when winding, the negative electrode sheet 110J needs to be inserted before the positive electrode active material layer is wound, to ensure that the projection of the positive electrode active material layer on the negative electrode sheet 110J is within the negative electrode active material layer, that is, the active material layer on the negative electrode sheet 110J can completely cover the positive electrode active material layer, to avoid lithium deposition during the charge and discharge cycle of the battery with the winding core structure. Accordingly, the positive electrode active material layer needs to be cut off in advance at the end of winding, and then the positive electrode assembly 200J, the first diaphragm 300J and the second diaphragm 400J are cut simultaneously.

[0094] The following is an exemplary description of the winding core structure according to the twelfth embodiment of the present application, which includes a wound negative electrode assembly, a positive electrode assembly and a separator, and the separator is located between the negative electrode assembly and the positive electrode assembly to insulate and separate the negative electrode assembly from the positive electrode assembly. The negative electrode assembly includes a negative electrode sheet and a first insulating member, the first insulating member is coated on the winding start side of the negative electrode sheet (that is, the side located inside the winding core structure), the winding start end of the negative electrode assembly is located at the first insulating member, and the winding end end of the negative electrode assembly is the winding end end of the negative electrode sheet. The positive electrode assembly includes a positive electrode sheet and a fourth insulating member, the fourth insulating member is coated on the winding end side of the positive electrode sheet (that is, the side located outside the winding core structure), the winding start end of the positive electrode assembly is the winding start end of the positive electrode sheet, and the winding end end of the positive electrode assembly is located at the fourth insulating member. The diaphragm includes a first diaphragm and a second diaphragm. Before the winding core structure is wound, the first diaphragm is located between the negative electrode assembly and the positive electrode assembly, and the second diaphragm is located on the side of the positive electrode assembly away from the first diaphragm. That is, the winding core structure of the embodiment of the present application is formed by stacking the second diaphragm, the positive electrode assembly, the first diaphragm and the negative electrode assembly in the order of the second diaphragm, the positive electrode assembly, and the first diaphragm in the order of stacking and winding from the inside to the outside. The winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting end of the first diaphragm and the winding starting end of the second diaphragm are flush, and the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, the winding ending end of the first diaphragm and the winding ending end of the second diaphragm are flush. Among them, the outermost circle of the winding core structure is the second diaphragm. When the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet or the negative electrode sheet from contacting the battery shell, thereby avoiding a short circuit in the battery.

[0095] The following is an exemplary description of the winding core structure according to the thirteenth embodiment of the present application, which includes a wound negative electrode assembly, a positive electrode assembly and a separator, and the separator is located between the negative electrode assembly and the positive electrode assembly to insulate and separate the negative electrode assembly from the positive electrode assembly. The negative electrode assembly includes a negative electrode plate and a second insulating member, the second insulating member is coated on the winding end side of the negative electrode plate (that is, the side located outside the winding core structure), the winding start end of the negative electrode assembly is the winding start end of the negative electrode plate, and the winding end end of the negative electrode assembly is located at the second insulating member. The positive electrode assembly includes a positive electrode plate and a third insulating member, the third insulating member is coated on the winding start side of the positive electrode plate (that is, the side located inside the winding core structure), the winding start end of the positive electrode assembly is located at the third insulating member, and the winding end end of the positive electrode assembly is the winding end end of the positive electrode plate. The diaphragm includes a first diaphragm and a second diaphragm. Before the winding core structure is wound, the first diaphragm is located between the negative electrode assembly and the positive electrode assembly, and the second diaphragm is located on the side of the positive electrode assembly away from the first diaphragm. That is, the winding core structure of the embodiment of the present application is formed by stacking the second diaphragm, the positive electrode assembly, the first diaphragm and the negative electrode assembly in the order of the second diaphragm, the positive electrode assembly, and the first diaphragm in the order of stacking and winding from the inside to the outside. The winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting end of the first diaphragm and the winding starting end of the second diaphragm are flush, and the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, the winding ending end of the first diaphragm and the winding ending end of the second diaphragm are flush. Among them, the outermost circle of the winding core structure is the second diaphragm. When the shell of the battery with the winding core structure is charged, it can prevent the positive electrode sheet or the negative electrode sheet from contacting the battery shell, thereby avoiding a short circuit in the battery.

[0096] The present application also provides a battery, which includes the winding core structure as described above, and the battery may be a cylindrical battery.

[0097] The present application also provides an electrical device, which includes the battery as described above.

[0098] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

Claims

1. A winding core structure, characterized in that: include: A negative electrode assembly, a positive electrode assembly and a separator are wound together, wherein the separator is located between the negative electrode assembly and the positive electrode assembly to insulate and separate the negative electrode assembly from the positive electrode assembly, the negative electrode assembly includes a negative electrode sheet, and the positive electrode assembly includes a positive electrode sheet; Wherein, the negative electrode assembly further includes a first insulating member coated on the winding starting side of the negative electrode sheet and a second insulating member coated on the winding ending side of the negative electrode sheet, the winding starting end of the negative electrode assembly is located at the first insulating member, and the winding ending end of the negative electrode assembly is located at the second insulating member; and / or, the positive electrode assembly further includes a third insulating member coated on the winding starting side of the positive electrode sheet and a fourth insulating member coated on the winding ending side of the positive electrode sheet, the winding starting end of the positive electrode assembly is located at the third insulating member, and the winding ending end of the positive electrode assembly is located at the fourth insulating member; or, the negative electrode assembly The positive electrode assembly further comprises a first insulating member coated on the winding start side end of the negative electrode sheet, the positive electrode assembly further comprises a fourth insulating member coated on the winding end side of the positive electrode sheet, the winding start end of the negative electrode assembly is located at the first insulating member, and the winding end end of the positive electrode assembly is located at the fourth insulating member; or, the negative electrode assembly further comprises a second insulating member coated on the winding end side of the negative electrode sheet, the positive electrode assembly further comprises a third insulating member coated on the winding start side of the positive electrode sheet, the winding end end of the negative electrode assembly is located at the second insulating member, and the winding start end of the positive electrode assembly is located at the third insulating member; The winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, and the winding starting end of the separator are aligned, and the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, and the winding ending end of the separator are aligned.

2. The winding core structure according to claim 1, characterized in that: The negative electrode assembly further comprises a first insulating member coated on the winding start side of the negative electrode sheet and a second insulating member coated on the winding end side of the negative electrode sheet, the winding start end of the negative electrode assembly is located at the first insulating member, and the winding end end of the negative electrode assembly is located at the second insulating member, and the positive electrode assembly further comprises a third insulating member coated on the winding start side of the positive electrode sheet and a fourth insulating member coated on the winding end side of the positive electrode sheet, the winding start end of the positive electrode assembly is located at the third insulating member, and the winding end end of the positive electrode assembly is located at the fourth insulating member; The first insulating member includes a first part and a second part connected to each other, the first part is connected to the winding start end of the negative electrode plate, the winding start end of the negative electrode assembly is located at the first part, and the second part is coated on the outer surface of the negative electrode plate close to the first part; The second insulating member includes a third portion and a fourth portion connected to each other, the third portion is connected to the winding tail end of the negative electrode plate, the winding tail end of the negative electrode assembly is located at the third portion, and the fourth portion is coated on the outer surface of the negative electrode plate close to the third portion; The third insulating member includes a fifth portion and a sixth portion connected to each other, the fifth portion is connected to the winding start end of the positive electrode plate, the winding start end of the positive electrode assembly is located at the fifth portion, and the sixth portion is coated on the outer surface of the positive electrode plate close to the fifth portion; The fourth insulating member includes a seventh part and an eighth part which are connected to each other, so that the seventh part is connected to the winding tail end of the positive electrode plate, the winding tail end of the positive electrode assembly is located in the seventh part, and the eighth part is coated on the outer surface of the positive electrode plate close to the seventh part.

3. The winding core structure according to claim 2, characterized in that: The length of the second part of the first insulating member along the winding direction is 1 mm-20 mm; The length of the fourth portion of the second insulating member along the winding direction is 1 mm-20 mm; The length of the sixth portion of the third insulating member along the winding direction is 1 mm-20 mm; The length of the eighth portion of the fourth insulating member along the winding direction is 1 mm-20 mm.

4. The winding core structure according to claim 2, characterized in that: The length of the first part of the first insulating member along the winding direction is 20 mm-150 mm; The length of the third portion of the second insulating member along the winding direction is greater than or equal to 3 mm.

5. The winding core structure according to claim 2, characterized in that: The negative electrode assembly further includes a first insulating member coated on a first side of the negative electrode plate and a second insulating member coated on a second side of the negative electrode plate, and the positive electrode assembly further includes a third insulating member coated on a first side of the positive electrode plate and a fourth insulating member coated on a second side of the positive electrode plate; The length of the first portion of the first insulating member along the winding direction is a first length, the length of the fifth portion of the third insulating member along the winding direction is a second length, the second length is greater than the first length, and the difference between the second length and the first length is greater than or equal to 5 mm; The length of the third portion of the second insulating member along the winding direction is a third length, the length of the seventh portion of the fourth insulating member along the winding direction is a fourth length, the fourth length is greater than the third length, and the difference between the fourth length and the third length is greater than or equal to 5 mm.

6. The winding core structure according to any one of claims 2 to 5, characterized in that: The negative electrode plate comprises a first current collector and a first active material layer and a second active material layer located on both sides of the first current collector, and the positive electrode plate comprises a second current collector and a third active material layer and a fourth active material layer located on both sides of the second current collector; The first insulating member has two layers, the first portions of the two layers of the first insulating member are butted against each other, the second portion of one layer of the first insulating member is coated on the outer surface of the first active material layer on the side close to the first portion, and the second portion of the other layer of the first insulating member is coated on the outer surface of the second active material layer on the side close to the first portion; The second insulating member has two layers, the third portions of the two layers of the second insulating member are butted against each other, the fourth portion of one layer of the second insulating member is coated on the outer surface of the first active material layer close to the third portion, and the fourth portion of the other layer of the second insulating member is coated on the outer surface of the second active material layer close to the third portion; The third insulating member has two layers, and the fifth portions of the two layers of the third insulating member are butted against each other, the sixth portion of one layer of the third insulating member is coated on the outer surface of the third active material layer close to the fifth portion, and the sixth portion of the other layer of the third insulating member is coated on the outer surface of the fourth active material layer close to the fifth portion; The fourth insulating member has two layers, and the seventh portions of the two layers of the fourth insulating member are butted against each other. The eighth portion of one layer of the fourth insulating member is coated on the outer surface of the third active material layer close to the seventh portion, and the eighth portion of the other layer of the fourth insulating member is coated on the outer surface of the fourth active material layer close to the seventh portion.

7. The winding core structure according to claim 6, characterized in that: The thickness of each layer of the first insulating member, each layer of the second insulating member, each layer of the third insulating member and each layer of the fourth insulating member is 7 μm-20 μm.

8. The winding core structure according to any one of claims 1 to 5, characterized in that: The separator includes a first separator and a second separator, and the core structure includes the negative electrode assembly, the first separator, the positive electrode assembly and the second separator which are sequentially stacked and wound from the inside to the outside; or, the core structure includes the first separator, the negative electrode assembly, the second separator and the positive electrode assembly which are sequentially stacked and wound from the inside to the outside; or, the core structure includes the first separator, the positive electrode assembly, the second separator and the negative electrode assembly which are sequentially stacked and wound from the inside to the outside; or, the core structure includes the positive electrode assembly, the first separator, the negative electrode assembly and the second separator which are sequentially stacked and wound from the inside to the outside.

9. The winding core structure according to claim 8, characterized in that: The outermost circle of the winding core structure is the second separator, or the outermost circle of the winding core structure is the fourth insulating member, or the outermost circle of the winding core structure includes the negative electrode sheet and the second insulating member connected to the negative electrode sheet.

10. The winding core structure according to claim 8, characterized in that: The plane where the winding starting end of the negative electrode assembly, the winding starting end of the positive electrode assembly, the winding starting section of the first separator and the winding starting end of the second separator are located is the first plane, and the plane where the winding ending end of the negative electrode assembly, the winding ending end of the positive electrode assembly, the winding ending end of the first separator and the winding ending end of the second separator are located is the second plane, and the first plane and the second plane do not overlap.

11. A battery, characterized in that: It comprises the winding core structure as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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