Winding equipment and battery production system

Abstract

The utility model discloses winding equipment and a battery production system. The winding equipment comprises a bottom roller; the first pressing structure comprises first pressing rollers, the first pressing rollers are arranged on one side of the bottom roller at intervals in the radial direction of the bottom roller so as to press diaphragms on the two sides of the pole piece in a matched mode, and gaps are formed between the first pressing rollers and the bottom roller; the length of the first pressing roller is smaller than that of the bottom roller, so that the first pressing roller is used for pressing the part, exceeding the pole piece, of the diaphragm; according to the winding equipment, the first pressing roller and the bottom roller are arranged, the diaphragms on the two sides of the pole piece are pressed through the first pressing roller and the bottom roller, so that the diaphragms can better wrap the pole piece, and the situation that the pole piece is exposed is reduced; the length of the first pressing roller is smaller than that of the bottom roller, so that the first pressing roller can only press the part, exceeding the pole piece, of the diaphragm and is not easy to press the pole piece, and damage of the first pressing roller and the bottom roller to the pole piece is reduced; and the first pressing roller only presses the part, exceeding the pole piece, of the diaphragm and can better press the diaphragm, so that the bonding effect between the diaphragms is improved.

Description

Technical Field

[0001] The present application relates to the field of battery processing technology, and in particular to a winding device and a battery production system. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the battery production process, the wrapping of the electrode by the diaphragm is a very important process. If the electrode is exposed outside the diaphragm, it is easy to cause it to contact with the adjacent electrode and short-circuit, causing battery failure. Utility Model Content

[0004] In view of the above problems, the present application provides a winding device and a battery production system to alleviate the situation where the pole piece is exposed outside the diaphragm and causes failure.

[0005] In a first aspect, an embodiment of the present application provides a winding device, comprising:

[0006] Bottom roller;

[0007] A first pressing structure includes a first pressing roller, which is arranged at a side of the bottom roller at intervals along the radial direction of the bottom roller to cooperate with the diaphragms on both sides of the electrode piece to press together, and a gap is formed between the first pressing roller and the bottom roller for the diaphragms on both sides of the electrode piece to pass through;

[0008] The length of the first pressing roller is smaller than that of the bottom roller, so that the first pressing roller is used to press the portion of the diaphragm that extends beyond the pole piece.

[0009] In the technical solution of the present embodiment, a first pressing roller and a bottom roller are provided, and the diaphragms on both sides of the pole piece are pressed together by the first pressing roller and the bottom roller, so that the diaphragms can better wrap the pole piece, thereby reducing the exposure of the pole piece; the length of the first pressing roller is made smaller than the length of the bottom roller, so that the first pressing roller can only press the portion of the diaphragm extending beyond the pole piece without easily pressing and holding the pole piece, thereby reducing the damage to the pole piece by the first pressing roller and the bottom roller; because the pole piece has a certain thickness, pressing and holding the pole piece and the diaphragm at the same time can easily lead to insufficient pressing force on the portion of the diaphragm extending beyond the pole piece, and can easily lead to poor bonding effect on the portion of the diaphragm extending beyond the pole piece, so that the first pressing roller only presses the portion of the diaphragm extending beyond the pole piece, which can also better press the diaphragm, thereby improving the bonding effect between the diaphragms.

[0010] In some embodiments, the first pressing structure further includes a first driving assembly, and the first driving assembly is used to drive the first pressing roller to move so as to change the size of the gap in the radial direction of the bottom roller.

[0011] In the technical solution of this embodiment, the first pressure roller is driven to move by the first driving component so that the size of the gap between the first pressure roller and the bottom roller can be changed; because the pole piece includes a pole ear portion, and the pole ear portion needs to extend beyond the diaphragm, the first pressure roller is prone to press the pole ear portion and cause damage to the pole ear portion during the process of pressing the diaphragm. The size of the gap is changed by the first driving component so that the first driving component can increase the size of the gap when the first pressure roller is pressed near the pole ear portion, and enable the first pressure roller to avoid the pole ear portion, thereby reducing damage to the pole ear portion during the pressing process.

[0012] In some embodiments, the first pressure roller has at least a first position and a second position;

[0013] When the first pressing roller is located at the first position, a first gap is formed between the first pressing roller and the bottom roller;

[0014] When the first pressing roller is located at the second position, a second gap is formed between the first pressing roller and the bottom roller;

[0015] In the radial direction of the bottom roller, the difference between the size of the first gap and the size of the second gap ranges from 1 mm to 3 mm.

[0016] In the technical solution of this embodiment, the first pressure roller can move to different positions and form a first gap and a second gap, and the difference between the first gap and the second gap is in the range of 1mm to 3mm, so that the first pressure roller can better avoid the pole ear part, and the movement range of the first pressure roller is smaller, so that the first pressure roller can move between different positions faster.

[0017] In some embodiments, the first driving assembly includes a first driving shaft, to which a first pressure roller is connected, and the first driving shaft is used to drive the first pressure roller to rotate so as to change the size of the gap in the radial direction of the bottom roller.

[0018] The technical solution of this embodiment provides some structures in which the first driving component drives the first pressure roller to move. The first driving component drives the first pressure roller to rotate, and the rotation of the first pressure roller can change the size of the gap, that is, the first pressure roller can be pressed on the diaphragm after rotation, and can also be separated from the diaphragm after rotation, so that the first pressure roller can press the diaphragm and avoid the pole ear.

[0019] In some embodiments, the first pressing roller is eccentrically disposed relative to the axis of the first driving shaft, and the first driving shaft is used to drive the first pressing roller to rotate so as to change the size of the gap in the radial direction of the bottom roller.

[0020] The technical solution of this embodiment provides some specific structures for the first driving component to drive the first pressure roller to rotate, and the first pressure roller is eccentrically arranged on the first driving shaft so that the gap can change with the rotation of the first pressure roller, so that the first pressure roller can press the diaphragm and avoid the pole ear.

[0021] In some embodiments, in the radial direction of the bottom roller, the distance between the axis of the first pressure roller and the axis of the first driving shaft ranges from 3 mm to 5 mm.

[0022] The technical solution of this embodiment further provides a range of eccentricity of the first pressure roller to the first drive shaft, so that the first pressure roller can better avoid the pole ear part and also make the movement range of the first pressure roller smaller, so that the first pressure roller can move quickly between different positions.

[0023] In some embodiments, the first pressure roller is coaxially arranged with the first driving shaft, and a avoidance groove is provided on the side wall of the first pressure roller, and the length direction of the avoidance groove is parallel to the axial direction of the first pressure roller.

[0024] The technical solution of this embodiment provides other specific structures for the first driving component to drive the first pressure roller to rotate. A avoidance groove is arranged on the side wall of the first pressure roller, and the avoidance groove is enabled to be opposite to the pole ear portion during the rotation of the first pressure roller, thereby reducing the damage of the first pressure roller to the pole ear portion. At the same time, the side wall of the first pressure roller except the avoidance groove can also press and hold the diaphragm to press the diaphragm and improve the bonding effect between the diaphragms.

[0025] In some embodiments, along the axial direction of the first driving shaft, at least two first mounting positions are provided on the first driving shaft;

[0026] The first pressing roller is detachably sleeved on the first driving shaft, and the first pressing roller can be located at any first installation position.

[0027] In the technical solution of this embodiment, the first pressing roller can be detachably installed at different positions of the first driving shaft, so that the first pressing roller can press and hold diaphragms of various widths and sizes, thereby allowing the winding device to adapt to electrode assemblies of various specifications.

[0028] In some embodiments, the first driving assembly further includes a first driving member connected to the first driving shaft and configured to drive the first driving shaft to rotate.

[0029] In the technical solution of this embodiment, the first driving member drives the first driving shaft to rotate, so as to drive the first pressure roller to rotate and adjust the position of the first pressure roller through the first driving shaft, so that the first driving member can adjust the position of the first pressure roller to avoid the pole ear part or the part of the diaphragm that extends beyond the pole piece.

[0030] In some embodiments, a first heating element is disposed in the first pressing roller, and the first heating element is disposed in the first pressing roller around the axis of the first pressing roller.

[0031] In the technical solution of this embodiment, a first heating element is arranged in the first pressing roller, so that the first pressing roller can not only press the diaphragm beyond the pole piece, but also play a heating role, so as to better improve the bonding effect between the diaphragms.

[0032] In some embodiments, the heating temperature range of the first heating element is 60° C. to 90° C., and the temperature error range of the first heating element is ±3° C.

[0033] The technical solution of this embodiment provides the heating temperature and error range of the first heating element, so that the first heating element can not only improve the bonding effect, but also reduce the damage of the first heating element to the diaphragm and the adjacent electrode.

[0034] In some embodiments, the first pressing structure further includes a first adjusting component connected to the first pressing roller, and the first adjusting component is used to adjust the distance between the first pressing roller and the bottom roller.

[0035] In the technical solution of this embodiment, the distance between the first pressure roller and the bottom roller is adjusted by the first adjustment component, so that the first pressure roller and the bottom roller can press and hold electrode assemblies of various thicknesses, thereby allowing the winding equipment to adapt to electrode assemblies of various specifications.

[0036] In some embodiments, the winding device further comprises a second pressing structure, the second pressing structure comprising a second pressing roller, the length of the second pressing roller being shorter than the length of the first pressing roller;

[0037] Along the direction parallel to the axis of the bottom roller, the second pressing roller and the first pressing roller are arranged on the same side of the bottom roller and are arranged at intervals, so as to press the parts of the diaphragms on opposite sides of the pole piece that protrude from the pole piece.

[0038] In the technical solution of this embodiment, the first pressing structure and the second pressing structure respectively press the opposite sides of the electrode assembly, so that the winding equipment can simultaneously press the parts of the diaphragm on the opposite sides of the electrode assembly that extend beyond the pole pieces, thereby improving the efficiency of the winding equipment in pressing the diaphragm.

[0039] In some embodiments, the distance between the second pressing roller and the first pressing roller ranges from 50 mm to 250 mm.

[0040] The technical solution of this embodiment provides some spacing ranges between the first pressing roller and the second pressing roller, so that the first pressing roller and the second pressing roller are not easy to press the electrode sheet when the electrode sheet widths are different, thereby enabling the winding equipment to adapt to electrode assemblies with different widths.

[0041] In some embodiments, the second pressing structure includes a second driving shaft, which is connected to the second pressing roller and is used to drive the second pressing roller to rotate.

[0042] The technical solution of this embodiment provides some structures for the second driving component to drive the second pressing roller to move, and the second pressing roller is driven to rotate by the second driving component so that the second pressing roller can rotate during the feeding process of the electrode assembly, thereby reducing the friction between the second pressing roller and the diaphragm and reducing the damage of the second pressing roller to the diaphragm.

[0043] In some embodiments, along the axial direction of the second driving shaft, at least two second mounting positions are provided on the second driving shaft;

[0044] The second pressing roller is detachably sleeved on the second driving shaft, and the second pressing roller can be located at any second installation position.

[0045] In the technical solution of this embodiment, the second pressing roller can be detachably installed at different positions of the second driving shaft, so that the distance between the second pressing roller and the first pressing roller is adjustable, thereby enabling the first pressing roller and the second pressing roller to press diaphragms of various widths and sizes, and enabling the winding equipment to adapt to electrode assemblies of various specifications.

[0046] In some embodiments, the winding device further comprises a main driving assembly, the main driving assembly being used for driving the bottom roller and the second driving shaft to rotate, and the bottom roller and the second driving shaft rotate in opposite directions.

[0047] In the technical solution of this embodiment, the main driving assembly drives the bottom roller and the second driving shaft to rotate, so that the bottom roller can drive the electrode assembly to feed, and the second driving shaft can drive the second pressure roller to rotate; the rotation direction of the second driving shaft is opposite to the rotation direction of the bottom roller, so as to reduce the friction between the second pressure roller and the diaphragm, thereby reducing the damage of the second pressure roller to the diaphragm.

[0048] In some embodiments, a second heating element is disposed in the second pressing roller, and the second heating element is disposed in the second pressing roller around the axis of the second pressing roller.

[0049] In the technical solution of this embodiment, a second heating element is arranged in the second pressing roller, so that the second pressing roller can not only press the diaphragm beyond the pole piece, but also play a heating role, so as to better improve the bonding effect between the diaphragms.

[0050] In some embodiments, the heating temperature range of the second heating element is 60° C. to 90° C., and the temperature error range of the second heating element is ±3° C.

[0051] The technical solution of this embodiment provides the heating temperature and error range of the second heating element, so that the second heating element can not only improve the bonding effect, but also reduce the damage of the second heating element to the diaphragm and the adjacent electrode.

[0052] In some embodiments, a first heating element is disposed in the first pressing roller, and a temperature difference between the second heating element and the first heating element is in the range of ±5°C.

[0053] The technical solution of this embodiment provides some temperature difference ranges between the first heating element and the second heating element in the first pressure roller, so that the first heating element and the second heating element can not only improve the bonding effect, but also reduce the temperature difference on the two sides of the pole piece to reduce the occurrence of negative situations such as deformation of the pole piece.

[0054] In some embodiments, the second pressing structure includes a second adjusting component connected to the second pressing roller, and the second adjusting component is used to adjust the distance between the pressing roller and the bottom roller.

[0055] In the technical solution of this embodiment, the distance between the second pressing roller and the bottom roller is adjusted by the second adjusting component, so that the second pressing roller and the bottom roller can press and hold electrode assemblies of various thicknesses, thereby allowing the winding equipment to adapt to electrode assemblies of various specifications.

[0056] In some embodiments, a bottom heating element is disposed in the bottom roller, and the bottom heating element is disposed in the bottom roller around the axis of the bottom roller.

[0057] In the technical solution of this embodiment, a bottom heating element is provided in the bottom roller to heat the electrode assembly through the bottom heating element to reduce the occurrence of negative conditions such as deformation that may be caused by excessive temperature differences on the electrode assembly; at the same time, heating the electrode assembly through the bottom heating element can also transport the electrode assembly with the temperature to the next process, so as to facilitate the processing of the electrode assembly in the next process.

[0058] In some embodiments, the heating temperature range of the bottom heating element is 30°C to 45°C, and the temperature error range of the bottom heating element is ±3°C.

[0059] The technical solution of this embodiment provides a heating temperature range for the bottom heating element, so that the bottom heating element can not only reduce the temperature difference on the electrode assembly and reduce the occurrence of negative effects such as deformation of the electrode assembly, but also reduce the power of the bottom heating element, thereby reducing energy consumption.

[0060] In a second aspect, some embodiments of the present application further provide a battery production system, comprising the winding device provided by some embodiments of the first aspect.

[0061] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0063] Figure 1 Schematic diagram of the structure of the electrode assembly provided in some embodiments of the present application Figure 1 ;

[0064] Figure 2 Schematic diagram of the structure of the electrode assembly provided in some embodiments of the present application Figure 2 ;

[0065] Figure 3 A schematic diagram of the structure of the intermediate structure of the electrode assembly provided in some embodiments of the present application;

[0066] Figure 4 A three-dimensional schematic diagram of a winding device provided in some embodiments of the present application;

[0067] Figure 5 A schematic diagram of a winding device provided in some embodiments of the present application Figure 1 ;

[0068] Figure 6 A schematic diagram of a winding device provided in some embodiments of the present application Figure 2 ;

[0069] Figure 7 A schematic structural diagram of a winding device provided in some embodiments of the present application when the first pressing roller is located at a first position;

[0070] Figure 8 A schematic diagram of the structure of a winding device provided in some embodiments of the present application when the first pressing roller is located at the second position;

[0071] Fig. 9 A schematic structural diagram of a winding device provided in some other embodiments of the present application when the first pressing roller is located at a first position;

[0072] Fig.10 A schematic structural diagram of a winding device provided in some other embodiments of the present application when the first pressure roller is located in the second position.

[0073] The meanings of the marks in the figure are:

[0074] 100. Winding equipment;

[0075] 10. Bottom roller;

[0076] 20. First pressing structure; 21. First pressing roller; 211. Avoidance groove; 22. First driving assembly; 221. First driving shaft; 2211. First mounting position; 222. First driving member; 23. First adjusting assembly;

[0077] 31. first gap; 32. second gap;

[0078] 40. second pressing structure; 41. second pressing roller; 42. second driving shaft; 421. second mounting position; 43. second adjusting assembly;

[0079] 50. Main drive assembly;

[0080] 200. Electrode assembly;

[0081] 60, pole piece; 61, pole ear portion; 62, main body portion;

[0082] 70. Diaphragm. DETAILED DESCRIPTION

[0083] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0085] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0086] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0087] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0088] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0089] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0090] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0091] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0092] In the structure of the battery, the electrode assembly is an important component, and the winding or lamination process of the electrode assembly is a crucial link. At present, during the winding or lamination process of the electrode assembly, the diaphragm is prone to abnormal conditions such as folding, and one of the functions of the diaphragm is to separate the adjacent positive and negative electrodes to reduce the occurrence of short circuits caused by contact between the positive and negative electrodes, thereby reducing electrode assembly failures and reducing the negative impact on the yield of the electrode assembly; that is, abnormal conditions such as diaphragm folding are likely to cause the electrode sheets to be exposed and easily lead to short circuits.

[0093] At present, in order to reduce the exposure of the pole piece and enhance the protection of the diaphragm to the pole piece, the pole piece is usually rolled and compounded between two diaphragms through a composite device to form an intermediate structure. In such a structure, there is a strong bonding force between the diaphragm and the large surface of the pole piece, but the diaphragm has a poor side protection effect on the pole piece. Specifically, when the diaphragm area is roughly the same as the pole piece area, the diaphragm is not easy to cover the side of the pole piece. At this time, the side of the pole piece is still easy to be exposed, which can easily lead to short circuits and other situations; when the diaphragm area is larger than the pole piece area, in the process of compounding the pole piece and the diaphragm, the thickness of the intermediate structure at the location of the pole piece is larger, while the overall thickness of the intermediate structure at the part where the diaphragm exceeds the pole piece is smaller, resulting in poor pressing effect of the composite device on the part of the two diaphragms exceeding the pole piece, and poor bonding effect between the parts of the two diaphragms exceeding the pole piece, and the part of the diaphragm exceeding the pole piece still has the risk of opening and folding.

[0094] Based on the above considerations, in order to alleviate the situation where the pole piece is exposed outside the diaphragm and causes failure, an embodiment of the present application provides a winding device, which is provided with a bottom roller and a first pressing structure, so that the first pressing structure includes a first pressing roller arranged on one side of the bottom roller; the first pressing roller is spaced apart from the bottom roller, and the length of the first pressing roller is smaller than the length of the bottom roller.

[0095] In such a winding device, the intermediate structure can pass through the gap between the first pressure roller and the bottom roller, so that the first pressure roller can press the diaphragm; because the length of the first pressure roller is smaller than that of the bottom roller, the first pressure roller can only press the portion of the diaphragm that extends beyond the pole piece without easily pressing the pole piece, thereby reducing the damage of the first pressure roller and the bottom roller to the pole piece, and at the same time reducing the interference of the pole piece on the pressing of the two diaphragms, so that the first pressure roller can better press the portion of the diaphragm that extends beyond the pole piece, thereby improving the bonding effect between the diaphragms, reducing the occurrence of diaphragm opening and folding, reducing the risk of pole piece exposure and short circuit, and improving the yield of the electrode assembly.

[0096] The structure disclosed in the embodiment of the present application can be used as a partial structure of a winding device, and can also be used as a partial structure of a battery processing system.

[0097] The electrode assembly formed by the winding device provided in the embodiment of the present application can form a wound electrode assembly or a laminated electrode assembly. The electrode assembly formed by the winding device can be used as a component in a battery cell where an electrochemical reaction occurs, and the battery cell can be used in an electrical device that uses a battery as a power source or in various energy storage systems that use a battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, spacecraft, and the like.

[0098] For the convenience of explanation, the following embodiments are described by taking the winding device 100 of some embodiments of the present application for forming a wound electrode assembly 200 as an example.

[0099] refer to Figure 1 , Figure 2 , Figure 1 is a schematic structural diagram of a wound electrode assembly 200, Figure 2 : is a schematic diagram of the structure of the laminated electrode assembly 200. The electrode assembly 200 is a component in the battery cell where electrochemical reactions occur. A battery cell may contain one or more electrode assemblies 200. The electrode assembly 200 is mainly formed by winding or stacking a pole sheet 60 and a separator 70. The pole sheet 60 generally includes a positive pole sheet and a negative pole sheet, and a separator 70 is provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the main body 62 of the pole sheet 60, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute the pole ear part 61 of the pole sheet 60. The pole ear part 61 of the positive pole sheet and the pole ear part 61 of the negative pole sheet can be located together at one end of the main body 62 or respectively at both ends of the main body 62. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ear part 61 generally extends outside the separator 70 and connects the electrode terminal to form a current loop.

[0100] During the formation of the electrode assembly 200, the diaphragm 70 is usually first covered on both sides of the electrode sheet 60 (such as the positive electrode sheet or the negative electrode sheet), and the relative positions of the diaphragm 70 and the electrode sheet 60 are fixed to obtain an intermediate structure. The diaphragm 70 and the electrode sheet 60 are usually fixed by rolling composite, but other methods can also be used; then another electrode sheet 60 with a different polarity (such as the negative electrode sheet or the positive electrode sheet) is fixed on the intermediate structure to obtain the electrode assembly 200.

[0101] refer to Figures 3 to 5In the first aspect, the present application provides a winding device 100, including a bottom roller 10 and a first pressing structure 20, the first pressing structure 20, including a first pressing roller 21, the first pressing roller 21 is arranged on one side of the bottom roller 10 along the radial direction of the bottom roller 10 to cooperate with the diaphragm 70 on both sides of the pole piece 60, and there is a gap between the first pressing roller 21 and the bottom roller 10 for the diaphragm 70 on both sides of the pole piece 60 to pass through; the length of the first pressing roller 21 is less than the length of the bottom roller 10, so that the first pressing roller 21 is used to press the part of the diaphragm 70 that exceeds the pole piece 60.

[0102] Figure 5 In the figure, the direction of the X-axis is the radial direction of the bottom roller 10, and the direction of the Y-axis is the axial direction of the bottom roller 10.

[0103] The bottom roller 10 refers to a structure in the winding device 100 for supporting and conveying the intermediate structure. When the winding device 100 is in use, the intermediate structure is placed on the bottom roller 10. The rotation of the bottom roller 10 can drive the intermediate structure to move so as to drive the intermediate structure through the winding device 100. The bottom roller 10 can be a cylindrical structure, or a truncated cone structure or other shapes. The material of the bottom roller 10 can include metal, plastic or other materials.

[0104] The first pressing structure 20 refers to a structure in the winding device 100 for pressing the intermediate structure, and the first pressing roller 21 refers to a structure in the first pressing structure 20 for pressing the intermediate structure.

[0105] The first pressure roller 21 can rotate relative to the middle structure to roll and hold the middle structure, and at this time, there is rolling friction between the first pressure roller 21 and the middle structure; the first pressure roller 21 can also be a fixed structure and press the middle structure, and at this time, there is static friction between the first pressure roller 21 and the middle structure; the first pressure roller 21 can be a cylindrical structure, or a truncated cone structure or a structure of other shapes; the material of the first pressure roller 21 can include metal, plastic or other materials.

[0106] The first pressure roller 21 is arranged on one side of the bottom roller 10 along the radial direction Y of the bottom roller 10, and a gap is formed between the first pressure roller 21 and the bottom roller 10, and the gap refers to the space between the side wall of the first pressure roller 21 and the side wall of the bottom roller 10; the intermediate structure can pass through the gap and be transported by the bottom roller 10 to the subsequent process of the winding device 100; in the process of the intermediate structure passing through the gap, the first pressure roller 21 can be pressed on the diaphragm 70.

[0107] The length of the bottom roller 10 refers to the size of the bottom roller 10 in the axial direction X, and the length of the first pressure roller 21 refers to the size of the first pressure roller 21 in the axial direction X of the bottom roller 10; because the bottom roller 10 is used to support and convey the intermediate structure, the length of the first pressure roller 21 is smaller than the length of the bottom roller 10, so that the first pressure roller 21 can only press the part of the diaphragm 70 that exceeds the pole piece 60 in the width direction of the diaphragm 70.

[0108] refer to Figure 3 The portion shown by W in the figure is the portion of the diaphragm 70 that extends beyond the pole piece 60, that is, the first pressing roller 21 only presses the area shown by W in the figure, and the dimension pressed by the first pressing roller 21 in the width direction of the diaphragm 70 can be equal to the width of the portion of the diaphragm 70 that extends beyond the pole piece 60, or can be smaller than the width of the portion of the diaphragm 70 that extends beyond the pole piece 60.

[0109] At this time, the first pressing roller 21 is not easy to press and hold the pole piece 60, so as to reduce the damage of the first pressing roller 21 to the pole piece 60; because the pole piece 60 has a certain thickness, pressing and holding the pole piece 60 and the diaphragm 70 at the same time may easily lead to insufficient pressing force on the part of the diaphragm 70 extending beyond the pole piece 60, and may easily lead to poor bonding effect on the part of the diaphragm 70 extending beyond the pole piece 60. Therefore, the first pressing roller 21 only presses and holds the part of the diaphragm 70 extending beyond the pole piece 60, and can also better press the parts of the two diaphragms 70 extending beyond the pole piece 60, so as to improve the bonding effect of the two diaphragms 70.

[0110] The winding device 100 may include one first pressing structure 20 or two first pressing structures 20. When the winding device 100 includes one first pressing structure 20, after the first pressing structure 20 finishes pressing one side of the intermediate structure, the intermediate structure may be turned over or changed sides and pressed again, so that both sides of the intermediate structure along the width direction are pressed together; when the winding device 100 includes two first pressing structures 20, the two first pressing structures 20 may press the opposite sides of the intermediate structure at the same time, so as to more efficiently press the two diaphragms 70 of the intermediate structure together.

[0111] It can be understood that after the two opposite sides of the intermediate structure are pressed together, the position of the pole piece 60 relative to the diaphragm 70 can also be relatively fixed, and at this time, there is no need to connect the diaphragm 70 to the pole piece 60.

[0112] In this embodiment, a first pressing roller 21 and a bottom roller 10 are provided, and the diaphragm 70 on both sides of the pole piece 60 is pressed by the first pressing roller 21 and the bottom roller 10, so that the diaphragm 70 can better wrap the pole piece 60, thereby reducing the exposure of the pole piece 60; the length of the first pressing roller 21 is made smaller than the length of the bottom roller 10, so that the first pressing roller 21 can only press the portion of the diaphragm 70 that exceeds the pole piece 60 without easily pressing the pole piece 60, so as to reduce the damage of the first pressing roller 21 and the bottom roller 10 to the pole piece 60; because the pole piece 60 has a certain thickness, pressing the pole piece 60 and the diaphragm 70 at the same time can easily lead to insufficient pressing force of the portion of the diaphragm 70 that exceeds the pole piece 60, and can easily lead to poor bonding effect of the portion of the diaphragm 70 that exceeds the pole piece 60, so that the first pressing roller 21 only presses the portion of the diaphragm 70 that exceeds the pole piece 60, and can also better press the diaphragm 70, so as to improve the bonding effect between the diaphragms 70.

[0113] refer to Figure 4 , Figure 5 In some embodiments, the first pressing structure 20 further includes a first driving assembly 22, and the first driving assembly 22 is used to drive the first pressing roller 21 to move so as to change the size of the gap in the radial direction of the bottom roller 10.

[0114] The first drive component 22 refers to a structure in the first pressing structure 20 for driving the first pressure roller 21 to move. After the first drive component 22 drives the first pressure roller 21, the size of the gap in the radial direction Y of the bottom roller 10 will change; for example, the first drive component 22 can drive the first pressure roller 21 to move to reduce the gap, so that the first pressure roller 21 can be pressed on the diaphragm 70, thereby pressing the two diaphragms 70 together; for another example, the first drive component 22 can drive the first pressure roller 21 to move to increase the gap, so that the first pressure roller 21 can move away from the bottom roller 10 to avoid the pole ear portion 61 of the intermediate structure, thereby reducing damage to the pole ear portion 61.

[0115] Accordingly, the first drive component 22 may include a linear feed mechanism. For example, the first drive component 22 may include devices such as a cylinder and a hydraulic cylinder, or may include mechanisms such as a rack and pinion with a motor and a screw nut with a motor. At this time, the first drive component 22 may drive the first pressure roller 21 to approach or move away from the bottom roller 10 along the radial direction Y of the bottom roller 10 to increase or decrease the size of the gap.

[0116] The first driving assembly 22 may further include a rotating mechanism. For example, the first driving assembly 22 may further include a cam-cooperating motor, an eccentric wheel-cooperating motor and other mechanisms. In this case, the first driving assembly 22 drives the first pressure roller 21 to rotate and can also change the size of the gap.

[0117] Since the pole piece 60 includes a pole ear portion 61 and the pole ear portion 61 needs to extend outside the diaphragm 70 , the first pressing roller 21 is likely to press the pole ear portion 61 and cause damage to the pole ear portion 61 during the process of pressing the diaphragm 70 .

[0118] Accordingly, in this embodiment, the first driving component 22 drives the first pressure roller 21 to move so that the size of the gap between the first pressure roller 21 and the bottom roller 10 can change; the size of the gap is changed by the first driving component 22, so that the first driving component 22 can increase the size of the gap when the first pressure roller 21 is pressed near the pole ear 61, and enable the first pressure roller 21 to avoid the pole ear 61, thereby reducing damage to the pole ear 61 during the pressing process.

[0119] refer to Figure 4 , Figure 5 , Figure 7 , Figure 8In some embodiments, the first pressure roller 21 has at least a first position and a second position; when the first pressure roller 21 is in the first position, a first gap 31 is formed between the first pressure roller 21 and the bottom roller 10; when the first pressure roller 21 is in the second position, a second gap 32 is formed between the first pressure roller 21 and the bottom roller 10; in the radial direction of the bottom roller 10, the difference between the size of the first gap 31 and the size of the second gap 32 ranges from 1 mm to 3 mm.

[0120] The first position and the second position are both positions to which the first pressure roller 21 can move; according to the movement trajectory of the first pressure roller 21, the first position and the second position can be on the same straight line or on the same circular trajectory; in addition to the first position and the second position, the first pressure roller 21 can also move to other positions.

[0121] When the first pressure roller 21 is located at the first position, a first gap 31 is formed between the first pressure roller 21 and the bottom roller 10. The first gap 31 refers to the space between the side wall of the first pressure roller 21 and the side wall of the bottom roller 10 when the first pressure roller 21 is located at the first position. The first gap 31 is used for the intermediate structure to pass through.

[0122] When the first pressure roller 21 is located in the second position, a second gap 32 is formed between the first pressure roller 21 and the bottom roller 10. The second gap 32 refers to the space between the side wall of the first pressure roller 21 and the side wall of the bottom roller 10 when the first pressure roller 21 is located in the second position. The second gap 32 is used for the intermediate structure to pass through.

[0123] The first gap 31 may be larger than the second gap 32, that is, when the first pressure roller 21 is located at the first position, the first pressure roller 21 does not contact the diaphragm 70 to avoid the pole ear portion 61, and when the first pressure roller 21 is located at the second position, the first pressure roller 21 presses on the diaphragm 70 to press the parts of the two diaphragms 70 that extend beyond the pole piece 60.

[0124] For example, the first drive component 22 can drive the first pressure roller 21 to move along the radial direction Y of the bottom roller 10. At this time, the first drive component 22 can drive the first pressure roller 21 to move in the direction away from the bottom roller 10 and move to the first position to avoid the pole ear portion 61; the first drive component 22 can also drive the first pressure roller 21 to move in the direction close to the bottom roller 10 and move to the second position to press the diaphragm 70.

[0125] For example, the first driving assembly 22 can also drive the first pressure roller 21 to rotate. At this time, the first driving assembly 22 can drive the first pressure roller 21 to rotate to the first position to avoid the pole ear portion 61; the first driving assembly 22 can also drive the first pressure roller 21 to rotate to the second position to press the diaphragm 70.

[0126] It can be understood that the first gap 31 can also be smaller than the second gap 32, that is, when the first pressure roller 21 is located in the first position, the first pressure roller 21 presses on the diaphragm 70 to press the two diaphragms 70 that extend beyond the pole piece 60, and when the first pressure roller 21 is located in the second position, the first pressure roller 21 does not contact the diaphragm 70 to avoid the pole ear portion 61.

[0127] The difference between the first gap 31 and the second gap 32 ranges from 1mm to 3mm. For example, the difference can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm or other values. Because a plurality of pole ears 61 are usually spaced apart on the intermediate structure, the first pressure roller 21 needs to frequently move between the first position and the second position, so that the difference between the first gap 31 and the second gap 32 ranges from 1mm to 3mm, so that the first pressure roller 21 can move relatively quickly to avoid the pole ears 61 or press the diaphragm 70.

[0128] In this embodiment, the first pressure roller 21 is able to move to different positions and form a first gap 31 and a second gap 32, and the difference between the first gap 31 and the second gap 32 is in the range of 1 mm to 3 mm, so that the first pressure roller 21 can better avoid the pole ear 61, and the movement range of the first pressure roller 21 is smaller, so that the first pressure roller 21 can move between different positions faster.

[0129] refer to Figures 5 to 10 In some embodiments, the first driving assembly 22 includes a first driving shaft 221, to which the first pressure roller 21 is connected. The first driving shaft 221 is used to drive the first pressure roller 21 to rotate to change the size of the gap in the radial direction of the bottom roller 10.

[0130] The first drive shaft 221 refers to a structure in the first drive assembly 22 for driving the first pressure roller 21 to rotate. The first drive shaft 221 is connected to the first pressure roller 21 and is used to drive the first pressure roller 21 to rotate. The first drive shaft 221 can be a cylindrical structure, a prismatic structure, or a structure of other shapes. The material of the first drive shaft 221 can include metal, plastic, or other materials.

[0131] The first driving shaft 221 is connected to the first pressure roller 21. The first pressure roller 21 can be connected to one end of the first driving shaft 221, or can be sleeved outside the first driving shaft 221. The first pressure roller 21 can be fixedly connected to the first driving shaft 221 by gluing, welding, etc., or can be detachably connected to the first driving shaft 221 by screwing, clamping, etc.

[0132] The first pressing roller 21 rotates with the first driving shaft 221 to change the size of the gap in the radial direction Y of the bottom roller 10. In some embodiments, the first pressing roller 21 can be a cylindrical structure and eccentrically connected to the first driving shaft 221. At this time, the size of the gap can change with the rotation of the first pressing roller 21. The first pressing roller 21 can rotate to a position with a larger gap size (such as the first position) to avoid the pole ear portion 61, and the first pressing roller 21 can also rotate to a position with a smaller gap size (such as the second position) to press the diaphragm 70; in other embodiments, the first pressing roller 21 can be a cam structure. At this time, the size of the gap can change with the rotation of the first pressing roller 21. The first pressing roller 21 can rotate to a position with a larger gap size (such as the first position) to avoid the pole ear portion 61, and the first pressing roller 21 can also rotate to a position with a smaller gap size (such as the second position) to press the diaphragm 70; it can be understood that in addition to the above two methods, the first pressing roller 21 can also include other structures to change the size of the gap by rotation.

[0133] The first driving shaft 221 can drive the first pressing roller 21 to rotate in the same direction; the first driving shaft 221 can also drive the first pressing roller 21 to rotate in different directions. For example, the first driving shaft 221 can drive the first pressing roller 21 to swing back and forth between the first position and the second position.

[0134] The present embodiment provides some structures in which the first driving component 22 drives the first pressure roller 21 to move. The first driving component 22 drives the first pressure roller 21 to rotate, and the rotation of the first pressure roller 21 can change the size of the gap, that is, the first pressure roller 21 can be pressed on the diaphragm 70 after rotation, and can also be separated from the diaphragm 70 after rotation, so that the first pressure roller 21 can press the diaphragm 70 and avoid the pole ear part 61.

[0135] refer to Figures 5 to 8 In some embodiments, the first pressure roller 21 is eccentrically arranged relative to the axis of the first driving shaft 221, and the first driving shaft 221 is used to drive the first pressure roller 21 to rotate to change the size of the gap in the radial direction of the bottom roller 10.

[0136] refer to Figure 7 , Figure 8 , the dimension h in the figure is the distance between the axis of the first pressing roller 21 and the axis of the first driving shaft 221; Figure 7 Schematic diagram of the first pressing roller 21 moving to a position with a larger gap size (eg, the first position), where the size H1 is the size of the gap; Figure 8 It is a schematic diagram of the first pressing roller 21 moving to a position with a smaller gap size (such as the second position), and the size shown by H2 in the figure is the size of the gap.

[0137] The eccentric setting of the axis of the first pressure roller 21 relative to the first driving shaft 221 means that the axis of the first pressure roller 21 does not coincide with the axis of the first driving shaft 221 and there is a gap between them; the first pressure roller 21 rotates with the first driving shaft 221 to change the size of the gap.

[0138] The first pressure roller 21 can always move in the same direction between a position with a larger gap size (such as the first position) and a position with a smaller gap size (such as the second position). At this time, the rotation directions of the first pressure roller 21 and the bottom roller 10 can be the same or different; the first pressure roller 21 can also reciprocate between a position with a larger gap size (such as the first position) and a position with a smaller gap size (such as the second position) in different directions.

[0139] For example, when the bottom roller 10 rotates in the counterclockwise direction, the rotation direction of the first pressure roller 21 can always be clockwise; that is, the first pressure roller 21 can move in the clockwise direction from a position with a larger gap size (e.g., the first position) to a position with a smaller gap size (e.g., the second position) to press the diaphragm 70; the first pressure roller 21 can also move in the clockwise direction from a position with a smaller gap size (e.g., the second position) to a position with a larger gap size (e.g., the first position) to avoid the pole ear 61.

[0140] For example, when the bottom roller 10 rotates in the counterclockwise direction, the first pressure roller 21 can move in the counterclockwise direction from a position with a larger gap size (e.g., the first position) to a position with a smaller gap size (e.g., the second position) to press the diaphragm 70; the first pressure roller 21 can also move in the clockwise direction from a position with a smaller gap size (e.g., the second position) to a position with a larger gap size (e.g., the first position) to avoid the pole ear 61.

[0141] This embodiment provides some specific structures for the first driving component 22 to drive the first pressure roller 21 to rotate, and the first pressure roller 21 is eccentrically arranged on the first driving shaft 221 so that the gap can change with the rotation of the first pressure roller 21, so that the first pressure roller 21 can press the diaphragm 70 and avoid the pole ear part 61.

[0142] refer to Figure 7 , Figure 8 In some embodiments, in the radial direction of the bottom roller 10, the distance between the axis of the first pressure roller 21 and the axis of the first driving shaft 221 ranges from 3 mm to 5 mm.

[0143] The distance between the axis of the first pressure roller 21 and the axis of the first drive shaft 221 is the eccentricity between the first pressure roller 21 and the first drive shaft 221, and the eccentricity is the distance shown as h in the figure; the eccentricity can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm or other values.

[0144] The larger the eccentricity, the smaller the gap size when the first pressure roller 21 is located at a position with a smaller gap size (for example, the second position); the larger the eccentricity, the longer it takes for the first pressure roller 21 to move to a position where the gap size is greater than the thickness of the intermediate structure during the process of the first pressure roller 21 moving from a position with a smaller gap size (for example, the second position) to a position with a larger gap size (for example, the first position).

[0145] Accordingly, the eccentricity is within the range of 3 mm to 5 mm, so that the first pressing roller 21 can not only better press the parts of the two diaphragms 70 that extend beyond the pole piece 60 , but also reduce damage to the diaphragm 70 , and also enable the first pressing roller 21 to quickly avoid the pole ear 61 to reduce damage to the pole ear 61 .

[0146] This embodiment enables the first pressure roller 21 to avoid the pole lug portion 61 better and also reduces the movement range of the first pressure roller 21 so that the first pressure roller 21 can move between different positions faster.

[0147] refer to Figure 4 , Figure 5 , Fig. 9 , Fig.10 In some embodiments, the first pressure roller 21 is coaxially arranged with the first driving shaft 221 , and a avoidance groove 211 is provided on the side wall of the first pressure roller 21 , and the length direction of the avoidance groove 211 is parallel to the axial direction of the first pressure roller 21 .

[0148] The first pressing roller 21 is coaxially arranged with the first driving shaft 221 , that is, the axial direction of the first pressing roller 21 coincides with the axis of the first driving shaft 221 .

[0149] A avoidance groove 211 is provided on the side wall of the first pressure roller 21, and the length direction of the avoidance groove 211 is parallel to the axial direction of the first pressure roller 21, so that when the first pressure roller 21 moves to the position where the avoidance groove 211 is opposite to the pole ear part 61, the first pressure roller 21 is not easy to press the pole ear part 61, thereby reducing the damage to the pole ear part 61; along the radial direction of the first pressure roller 21, the cross-sectional shape of the avoidance groove 211 can be square, trapezoidal, semicircular or other shapes.

[0150] In the process of the first driving member 222 driving the first pressure roller 21 to rotate, the gap can change; in the process of the avoidance groove 211 gradually moving toward the bottom roller 10 with the movement of the first pressure roller 21, the size of the gap is the size between the side wall of the bottom roller 10 and the inner wall or bottom wall of the avoidance groove 211 in the radial direction Y of the bottom roller 10; in the process of the avoidance groove 211 gradually moving toward the bottom roller 10 with the movement of the first pressure roller 21, the size of the gap gradually increases to avoid the pole ear portion 61; when the avoidance groove 211 is staggered with the bottom roller 10 with the movement of the first pressure roller 21, the gap between the first pressure roller 21 and the bottom roller 10 is smaller, and at this time the first pressure roller 21 can press the diaphragm 70 to press the two diaphragms 70 that extend beyond the pole piece 60 together.

[0151] Example, reference Fig. 9 When the first pressure roller 21 is located at a position with a larger gap size (such as the first position), the avoidance groove 211 is opposite to the bottom roller 10, and the avoidance groove 211 is also opposite to the pole ear portion 61, thereby reducing the damage of the first pressure roller 21 to the pole ear portion 61.

[0152] Example, reference Fig.10 When the first pressure roller 21 is located at a position with a smaller gap size (for example, the second position), the avoidance groove 211 is staggered with the bottom roller 10. At this time, the first pressure roller 21 can press on the diaphragm 70 to press the parts of the two diaphragms 70 that extend beyond the pole piece 60 together. It can be understood that after the avoidance groove 211 is completely staggered with the bottom roller 10, the gap size is always small to facilitate the pressing of the diaphragm 70.

[0153] The first driving member 222 can drive the first pressure roller 21 to rotate in the same direction all the time, and the first driving member 222 can drive the first pressure roller 21 to rotate synchronously with the bottom roller 10. For example, when the bottom roller 10 rotates counterclockwise, the first driving member 222 can drive the first pressure roller 21 to rotate continuously in the clockwise direction; when the pole ear portion 61 does not move between the first pressure roller 21 and the bottom roller 10, the avoidance groove 211 is staggered with the bottom roller 10 and the size of the gap is always small. At this time, the side wall of the first pressure roller 21 can be pressed against the diaphragm 70; when the pole ear portion 61 gradually approaches the bottom roller 10, the avoidance groove 211 rotates with the first pressure roller 21. And gradually approaches the bottom roller 10; when the pole ear 61 moves to between the first pressure roller 21 and the bottom roller 10, the avoidance groove 211 is also opposite to the bottom roller 10 and the pole ear 61, so that the first pressure roller 21 avoids the pole ear 61 and reduces the damage to the pole ear 61; after the pole ear 61 passes through the gap, the avoidance groove 211 gradually moves away from the bottom roller 10 with the rotation of the first pressure roller 21, and is staggered with the bottom roller 10, so that the side wall of the first pressure roller 21 can press the diaphragm 70.

[0154] The present embodiment provides other specific structures for the first driving component 22 to drive the first pressure roller 21 to rotate. A avoidance groove 211 is provided on the side wall of the first pressure roller 21, and the avoidance groove 211 can be opposite to the pole ear portion 61 during the rotation of the first pressure roller 21, thereby reducing the damage of the first pressure roller 21 to the pole ear portion 61. At the same time, the side wall of the first pressure roller 21 except the avoidance groove 211 can also press and hold the diaphragm 70 to press the diaphragm 70 and improve the bonding effect between the diaphragms 70.

[0155] refer to Figures 4 to 6 In some embodiments, at least two first mounting positions 2211 are provided on the first driving shaft 221 along the axial direction of the first driving shaft 221 ; the first pressure roller 21 is detachably mounted on the first driving shaft 221 , and the first pressure roller 21 can be located on any first mounting position 2211 .

[0156] The first mounting position 2211 refers to a position on the first drive shaft 221, and the first mounting position 2211 is used to accommodate the first pressure roller 21, that is, the first pressure roller 21 is located in the first mounting position 2211 and installed on the first drive shaft 221; the first mounting position 2211 can be a position set on the first drive shaft 221, or a structural member can be set on the first drive shaft 221 to enclose the first mounting position 2211.

[0157] There are at least two first installation positions 2211 , that is, the number of the first installation positions 2211 can be two, or three or more.

[0158] The first pressure roller 21 is sleeved on the first driving shaft 221, that is, the first driving shaft 221 can pass through the first pressure roller 21, so that the first driving shaft 221 drives the first pressure roller 21 to rotate; for example, the first pressure roller 21 can be provided with a through hole along its axial direction, and the first driving shaft 221 can pass through the through hole.

[0159] The first pressure roller 21 is detachably connected to the first drive shaft 221. The first pressure roller 21 can be detachably connected to the first drive shaft 221 by bolts, and can also be detachably connected to the first drive shaft 221 by snaps or other structures; the first pressure roller 21 is detachably connected to the first drive shaft 221, so that the first pressure roller 21 can be located at different first installation positions 2211, so that the first pressure roller 21 can be located at different positions along the axial direction of the bottom roller 10; because the widths of the intermediate structures corresponding to electrode assemblies 200 of different specifications and sizes are also different, the first pressure roller 21 can be located at different positions along the axial direction of the bottom roller 10, so that the first pressure roller 21 can adapt to intermediate structures of different specifications, so that the first pressure roller 21 can press the diaphragm 70 of intermediate structures of various widths and sizes that protrude beyond the electrode piece 60.

[0160] In the example, the first pressure roller 21 is detachably connected to the first driving shaft 221 by bolts, and a threaded hole is provided on the first driving shaft 221; a plurality of first mounting positions 2211 are provided on the first driving shaft 221 along its axial direction, and a threaded hole is provided in each first mounting position 2211 to facilitate fixing the first pressure roller 21 in the corresponding first mounting position 2211; this arrangement enables the first pressure roller 21 to be located at a plurality of different positions to accommodate intermediate structures of different width sizes.

[0161] In this embodiment, the first pressing roller 21 can be detachably installed at different positions of the first driving shaft 221, so that the first pressing roller 21 can press and hold diaphragms 70 of various widths and sizes, thereby allowing the winding device 100 to adapt to electrode assemblies 200 of various specifications.

[0162] refer to Figure 4 , Figure 5 In some embodiments, the first driving assembly 22 further includes a first driving member 222 , which is connected to the first driving shaft 221 and is used to drive the first driving shaft 221 to rotate.

[0163] The first driving member 222 refers to the structure in the first driving assembly 22 for driving the first driving shaft 221 to rotate. The first driving member 222 can be a servo motor, a rotary pump or other rotary power device. The first driving member 222 can also include a rack and pinion with a cylinder, a worm gear with an electric telescopic cylinder or other linear power devices with a steering structure.

[0164] For example, the first driving member 222 is a servo motor, which can drive the first driving shaft 221 to rotate in a clockwise direction or a counterclockwise direction, and can drive the first driving shaft 221 to change the rotation direction.

[0165] The output end of the first driving member 222 can be directly connected to the first driving shaft 221 coaxially to drive the first driving shaft 221 to rotate; the first driving member 222 can also be indirectly connected to the first driving shaft 221 through a coupling or other structure to drive the first driving shaft 221 to rotate.

[0166] In this embodiment, the first driving member 222 drives the first driving shaft 221 to rotate, so as to drive the first pressure roller 21 to rotate and adjust the position of the first pressure roller 21 through the first driving shaft 221, so that the first driving member 222 can adjust the position of the first pressure roller 21 to avoid the pole ear portion 61 or the portion of the pressing diaphragm 70 that extends beyond the pole piece 60.

[0167] In some embodiments, a first heating element is disposed in the first pressing roller 21 , and the first heating element is disposed in the first pressing roller 21 around the axis of the first pressing roller 21 .

[0168] The first heating element refers to a structure in the first pressure roller 21 that can heat the diaphragm 70 ; the first heating element may include a heating wire, a heating plate, a ceramic heating plate or other structures that can generate heat.

[0169] The first heating element is arranged around the axis of the first pressure roller 21, so that any position on the circumferential direction of the side wall of the first pressure roller 21 has heating capability, so as to heat the diaphragm 70 better and more evenly; the first heating element is arranged inside the first pressure roller 21 to reduce the direct contact between the first heating element and the diaphragm 70, thereby reducing the damage to the diaphragm 70 caused by excessive temperature, and at the same time, it can also make the side wall of the first pressure roller 21 smoother, thereby reducing the situation where the first heating element protrudes from the first pressure roller 21 and causes abnormal deformation of the diaphragm 70.

[0170] While the first pressure roller 21 presses the parts of the two diaphragms 70 that extend beyond the pole piece 60, the first heating element can heat the parts of the two diaphragms 70 that extend beyond the pole piece 60 and allow the parts of the two diaphragms 70 that extend beyond the pole piece 60 to deform and fuse with each other, thereby further improving the bonding effect between the parts of the two diaphragms 70 that extend beyond the pole piece 60 and reducing the occurrence of openings and the like.

[0171] In this embodiment, a first heating element is disposed in the first pressing roller 21 , so that the first pressing roller 21 can heat the portion of the diaphragm 70 extending beyond the pole piece 60 while pressing the diaphragm 70 , thereby better improving the bonding effect between the diaphragms 70 .

[0172] In some embodiments, the heating temperature range of the first heating element is 60°C to 90°C; for example, the temperature of the first heating element can be 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C or other values.

[0173] The heating temperature range of the first heating element is 60° C. to 90° C., so that the first heating element can not only deform the diaphragm 70 to improve the bonding effect between the diaphragms 70 , but also reduce damage to the diaphragm 70 and the adjacent pole piece 60 .

[0174] The temperature error range of the first heating element is ±3° C.; for example, the temperature error of the first heating element may be ±1° C., ±2° C., ±3° C. or other values.

[0175] Affected by factors such as the structure of the first heating element, power supply or other energy supply equipment, and ambient temperature, the heating temperature of the first heating element is not easy to maintain constant. The temperature error range on the first heating element is the temperature fluctuation range allowed by the first heating element. Within this error range, the heating and bonding effects of the first heating element on the diaphragm 70 are similar.

[0176] For example, the temperature of the first heating element can be 60°C. At this time, during the process of the first pressure roller 21 pressing the diaphragm 70, the error range of the first heating element can be ±1°C, that is, the actual temperature range of the first heating element can be 59°C to 61°C. Within this temperature range, the heating effect of the first heating element on the diaphragm 70 is similar; the first heating element can better reduce damage to the diaphragm 70 and the adjacent pole piece 60 at this temperature.

[0177] For example, the temperature of the first heating element can be 75°C. At this time, during the process of the first pressure roller 21 pressing the diaphragm 70, the error range of the first heating element can be ±2°C, that is, the actual temperature range of the first heating element can be 73°C~77°C. Within this temperature range, the heating effect of the first heating element on the diaphragm 70 is similar; at this temperature, the first heating element can not only improve the bonding effect between the diaphragms 70, but also reduce damage to the diaphragm 70 and the adjacent pole piece 60.

[0178] For example, the temperature of the first heating element can be 90°C. At this time, during the process of the first pressure roller 21 pressing the diaphragm 70, the error range of the first heating element can be ±3°C, that is, the actual temperature range of the first heating element can be 87°C to 93°C. Within this temperature range, the heating effect of the first heating element on the diaphragm 70 is similar; the first heating element can better improve the bonding effect between the diaphragms 70 at this temperature.

[0179] This embodiment provides the heating temperature and error range of the first heating element, so that the first heating element can not only improve the bonding effect, but also reduce the damage of the first heating element to the diaphragm 70 and the adjacent electrode piece 60.

[0180] refer to Figures 4 to 6 In some embodiments, the first pressing structure 20 further includes a first adjusting component 23 connected to the first pressing roller 21 , and the first adjusting component 23 is used to adjust the distance between the first pressing roller 21 and the bottom roller 10 .

[0181] The first adjustment component 23 refers to a structure in the first pressing structure 20 for adjusting the height of the first pressing roller 21. The first adjustment component 23 can increase or decrease the distance between the first pressing roller 21 and the bottom roller 10 to adapt to the intermediate structure of the electrode assembly 200 of various different thicknesses.

[0182] It can be understood that the function of the first adjustment component 23 is to drive the first pressure roller 21 to adapt to the intermediate structure of different thicknesses; the first driving component 22 is used to change the size of the gap on the bottom roller 10 to avoid the pole ear 61 and press the diaphragm 70.

[0183] The first adjustment component 23 may include a cylinder, a hydraulic cylinder or other linear feed components, and may also include a gear rack and a motor and other structures; the first adjustment member can directly adjust the height of the first pressure roller 21, and can also indirectly adjust the height of the first pressure roller 21 by adjusting the height of the first drive shaft 221.

[0184] In the example, the first adjusting component 23 is a cylinder, the telescopic end of the cylinder is connected to a bearing seat, and a bearing is provided in the bearing seat, the first drive shaft 221 is connected to the bearing, and the first drive shaft 221 is provided with a first pressure roller 21; the telescopic end of the cylinder can adjust the height of the bearing seat, thereby adjusting the height of the first drive shaft 221 and the first pressure roller 21, and at the same time it is not easy to interfere with the rotation of the first drive shaft 221.

[0185] In this embodiment, the distance between the first pressing roller 21 and the bottom roller 10 is adjusted by the first adjusting component 23 so that the first pressing roller 21 and the bottom roller 10 can press and hold electrode assemblies 200 of various thicknesses, thereby enabling the winding device 100 to adapt to electrode assemblies 200 of various specifications.

[0186] refer to Figures 4 to 6 In some embodiments, the winding device 100 also includes a second pressing structure 40, which includes a second pressing roller 41, and the length of the second pressing roller 41 is less than the length of the first pressing roller 21; along the direction parallel to the axis of the bottom roller 10, the second pressing roller 41 and the first pressing roller 21 are arranged on the same side of the bottom roller 10 and are spaced apart to be used for pressing the diaphragm 70 on opposite sides of the pole piece 60 that protrudes beyond the pole piece 60.

[0187] The second pressing structure 40 refers to a structure in the winding device 100 for pressing the intermediate structure, and the second pressing roller 41 refers to a structure in the second pressing structure 40 for pressing the intermediate structure.

[0188] The second pressure roller 41 can rotate relative to the middle structure to roll and hold the middle structure, and at this time, there is rolling friction between the second pressure roller 41 and the middle structure; the second pressure roller 41 can also be a fixed structure and press the middle structure, and at this time, there is static friction between the second pressure roller 41 and the middle structure; the second pressure roller 41 can be a cylindrical structure, or a truncated cone structure or a structure of other shapes; the material of the second pressure roller 41 can include metal, plastic or other materials.

[0189] The second pressure roller 41 is arranged on one side of the bottom roller 10 along the radial direction Y of the bottom roller 10, and the intermediate structure can pass through the space between the second pressure roller 41 and the bottom roller 10, and be transported by the bottom roller 10 to the process after the winding device 100; in the process of the intermediate structure passing through the space between the second pressure roller 41 and the bottom roller 10, the second pressure roller 41 can be pressed on the diaphragm 70.

[0190] The length of the bottom roller 10 refers to the size of the bottom roller 10 in the axial direction X, and the length of the second pressure roller 41 refers to the size of the second pressure roller 41 in the axial direction X of the bottom roller 10; because the bottom roller 10 is used to support and convey the intermediate structure, the length of the second pressure roller 41 is smaller than the length of the bottom roller 10, so that the second pressure roller 41 can only press the part of the diaphragm 70 that exceeds the pole piece 60 in the width direction of the diaphragm 70.

[0191] At this time, the second pressing roller 41 is not easy to press the pole piece 60, so as to reduce the damage of the second pressing roller 41 to the pole piece 60; because the pole piece 60 has a certain thickness, pressing the pole piece 60 and the diaphragm 70 at the same time may easily lead to insufficient pressing force of the part of the diaphragm 70 extending beyond the pole piece 60, and may easily lead to poor bonding effect of the part of the diaphragm 70 extending beyond the pole piece 60. Therefore, the second pressing roller 41 only presses the part of the diaphragm 70 extending beyond the pole piece 60, and can also better press the parts of the two diaphragms 70 extending beyond the pole piece 60, so as to improve the bonding effect of the two diaphragms 70.

[0192] The second pressing roller 41 and the first pressing roller 21 are arranged on the same side of the bottom roller 10, and the second pressing roller 41 and the first pressing roller 21 are arranged at an axial distance from each other along the bottom roller 10, so that the second pressing roller 41 and the first pressing roller 21 can respectively press the opposite sides of the middle structure; at this time, the middle structure only needs to pass through the winding device 100 once to complete the pressing operation of the opposite sides of the middle structure.

[0193] In this embodiment, the first pressing structure 20 and the second pressing structure 40 respectively press the opposite sides of the electrode assembly 200, so that the winding device 100 can simultaneously press the portion of the diaphragm 70 on the opposite sides of the electrode assembly 200 that protrudes beyond the pole piece 60, thereby improving the efficiency of the winding device 100 in pressing the diaphragm 70.

[0194] refer to Figures 4 to 6 In some embodiments, the distance between the second pressing roller 41 and the first pressing roller 21 ranges from 50 mm to 250 mm; for example, the distance can be 50 mm, 100 mm, 50 mm, 150 mm, 200 mm, 250 mm or other values.

[0195] The distance between the second pressure roller 41 and the first pressure roller 21 refers to the distance between the end surface of the first pressure roller 21 facing the second pressure roller 41 and the end surface of the second pressure roller 41 facing the first pressure roller 21, that is, the dimension of the intermediate structure that is not easily pressed by the first pressure roller 21 and the second pressure roller 41 in the width direction of the intermediate structure; the spacing between the first pressure roller 21 and the second pressure roller 41 is in the range of 50mm to 250mm, so that the first pressure roller 21 and the second pressure roller 41 can press the part of the diaphragm 70 that protrudes from the pole piece 60 in the intermediate structure of different widths, so that the winding device 100 can adapt to electrode assemblies 200 of various sizes and specifications.

[0196] This embodiment provides some spacing ranges between the first pressing roller 21 and the second pressing roller 41, so that the first pressing roller 21 and the second pressing roller 41 are not easy to press the electrode sheet 60 when the width of the electrode sheet 60 is different, so that the winding device 100 can adapt to electrode assemblies 200 with different width sizes.

[0197] refer to Figures 4 to 6 In some embodiments, the second pressing structure 40 includes a second driving shaft 42 , which is connected to the second pressing roller 41 and is used to drive the second pressing roller 41 to rotate.

[0198] The second drive shaft 42 refers to a structure in the second drive assembly used to drive the second pressure roller 41 to rotate. The second drive shaft 42 is connected to the second pressure roller 41 and is used to drive the second pressure roller 41 to rotate. The second drive shaft 42 can be a cylindrical structure, a prismatic structure or a structure of other shapes. The material of the second drive shaft 42 can include metal, plastic or other materials.

[0199] The second driving shaft 42 is connected to the second pressure roller 41. The second pressure roller 41 can be connected to one end of the second driving shaft 42, or can be sleeved outside the second driving shaft 42. The second pressure roller 41 can be fixedly connected to the second driving shaft 42 by gluing, welding, etc., or can be detachably connected to the second driving shaft 42 by screwing, clamping, etc.

[0200] The second drive shaft 42 can drive the second pressure roller 41 to rotate in the same direction, the second drive shaft 42 can also drive the second pressure roller 41 to rotate in different directions, and the second drive shaft 42 can also make the second pressure roller 41 relatively fixed and form static friction with the intermediate structure; for example, the second drive shaft 42 can drive the second pressure roller 41 to rotate.

[0201] This embodiment provides some structures for the second driving component to drive the second pressing roller 41 to move. The second driving component drives the second pressing roller 41 to rotate, so that the second pressing roller 41 can rotate during the feeding process of the electrode assembly 200, thereby reducing the friction between the second pressing roller 41 and the diaphragm 70 and reducing the damage of the second pressing roller 41 to the diaphragm 70.

[0202] refer to Figures 4 to 6 In some embodiments, at least two second mounting positions 421 are provided on the second driving shaft 42 along the axial direction of the second driving shaft 42 ; the second pressure roller 41 is detachably mounted on the second driving shaft 42 , and the second pressure roller 41 can be located on any second mounting position 421 .

[0203] The second mounting position 421 refers to a position on the second drive shaft 42, and the second mounting position 421 is used to accommodate the second pressure roller 41, that is, the second pressure roller 41 is located in the second mounting position 421 and is installed on the second drive shaft 42; the second mounting position 421 can be a position set on the second drive shaft 42, or a structural member can be arranged on the second drive shaft 42 to enclose the second mounting position 421.

[0204] There are at least two second installation positions 421 , that is, the number of the second installation positions 421 can be two, or three or more.

[0205] The second pressure roller 41 is sleeved on the second drive shaft 42, that is, the second drive shaft 42 can pass through the second pressure roller 41, so that the second drive shaft 42 drives the second pressure roller 41 to rotate; for example, the second pressure roller 41 can be provided with a through hole along its axial direction, and the second drive shaft 42 can pass through the through hole.

[0206] The second pressure roller 41 is detachably connected to the second drive shaft 42. The second pressure roller 41 can be detachably connected to the second drive shaft 42 by bolts, and can also be detachably connected to the second drive shaft 42 by snaps or other structures; the second pressure roller 41 is detachably connected to the second drive shaft 42 so that the second pressure roller 41 can be located at different second installation positions 421, so that the second pressure roller 41 can be located at different positions along the axial direction of the bottom roller 10; because the widths of the intermediate structures corresponding to electrode assemblies 200 of different specifications and sizes are also different, the second pressure roller 41 can be located at different positions along the axial direction of the bottom roller 10, so that the second pressure roller 41 can adapt to intermediate structures of different specifications and sizes, so that the second pressure roller 41 can press the diaphragm 70 of intermediate structures of various widths and sizes that protrude beyond the electrode piece 60.

[0207] In the example, the second pressure roller 41 is detachably connected to the second driving shaft 42 by bolts, and a threaded hole is provided on the second driving shaft 42; a plurality of second mounting positions 421 are provided on the second driving shaft 42 along its axial direction, and a threaded hole is provided in each second mounting position 421 to facilitate fixing the second pressure roller 41 in the corresponding second mounting position 421; this arrangement enables the second pressure roller 41 to be located at a plurality of different positions to accommodate intermediate structures of different width sizes.

[0208] It can be understood that only one of the first pressure roller 21 and the second pressure roller 41 can be capable of adjusting the relative position. For example, the first pressure roller 21 can be fixedly connected to the first drive shaft 221, and the second pressure roller 41 is located in a different second mounting position 421 of the second drive shaft 42. At this time, it can also play a role in adjusting the distance between the first pressure roller 21 and the second pressure roller 41; the first pressure roller 21 and the second pressure roller 41 can also both be capable of adjusting the relative position.

[0209] In this embodiment, the second pressing roller 41 can be detachably installed at different positions of the second driving shaft 42, so that the distance between the second pressing roller 41 and the first pressing roller 21 can be adjusted, thereby enabling the first pressing roller 21 and the second pressing roller 41 to press and hold diaphragms 70 of various widths and sizes, and enabling the winding device 100 to adapt to electrode assemblies 200 of various specifications.

[0210] refer to Figures 4 to 6 In some embodiments, the winding device 100 further includes a main driving assembly 50, and the main driving assembly 50 is used to drive the bottom roller 10 and the second driving shaft 42 to rotate, and the rotation directions of the bottom roller 10 and the second driving shaft 42 are opposite.

[0211] The main drive component 50 refers to the structure in the winding device 100 for driving the bottom roller 10 and the second drive shaft 42 to rotate. The main drive component 50 can be a servo motor, a rotary pump or other rotary power device. The main drive component 50 can also include a rack and pinion with a cylinder, a worm gear with an electric telescopic cylinder or other linear power devices with a steering structure; for example, the main drive component 50 is a servo motor.

[0212] The main drive assembly 50 can directly drive the bottom roller 10 to rotate, and drive the second drive shaft 42 to rotate through the transmission structure; the main drive assembly 50 can also directly drive the second drive shaft 42 to rotate, and drive the bottom roller 10 to rotate through the transmission structure; the transmission structure can be a combination structure of a gear set, a gear sprocket or other transmission structure.

[0213] The output end of the main drive assembly 50 can be directly connected to the bottom roller 10 or the second drive shaft 42 coaxially to drive the second drive shaft 42 to rotate; the main drive assembly 50 can also be indirectly connected to the bottom roller 10 or the second drive shaft 42 through a coupling or other structure to drive the second drive shaft 42 to rotate.

[0214] Driven by the main drive assembly 50, the rotation directions of the bottom roller 10 and the second drive shaft 42 are opposite, that is, the rotation directions of the bottom roller 10 and the second pressure roller 41 are opposite; because the intermediate structure passes between the second pressure roller 41 and the bottom roller 10, that is, the second pressure roller 41 and the bottom roller 10 are respectively located on opposite sides of the intermediate structure, and because the bottom roller 10 is used to convey the intermediate structure, the rotation direction of the second pressure roller 41 is opposite to that of the bottom roller 10, so that there can be rolling friction between the second pressure roller 41 and the intermediate structure, thereby reducing the damage of the second pressure roller 41 to the diaphragm 70.

[0215] In this embodiment, the main drive assembly 50 is used to drive the bottom roller 10 and the second drive shaft 42 to rotate, so that the bottom roller 10 can drive the electrode assembly 200 to feed, and the second drive shaft 42 can drive the second pressure roller 41 to rotate; the rotation direction of the second drive shaft 42 is opposite to the rotation direction of the bottom roller 10, so as to reduce the friction between the second pressure roller 41 and the diaphragm 70, thereby reducing the damage of the second pressure roller 41 to the diaphragm 70.

[0216] In some embodiments, a second heating element is disposed in the second pressing roller 41 , and the second heating element is disposed in the second pressing roller 41 around the axis of the second pressing roller 41 .

[0217] The second heating element refers to a structure in the second pressure roller 41 that can heat the diaphragm 70 ; the second heating element may include a heating wire, a heating plate, a ceramic heating plate or other structures that can generate heat.

[0218] The second heating element is arranged around the axis of the second pressure roller 41, so that any position on the circumferential direction of the side wall of the second pressure roller 41 has heating capability, so as to better and more evenly heat the diaphragm 70; the second heating element is arranged inside the second pressure roller 41 to reduce the direct contact between the second heating element and the diaphragm 70, thereby reducing the damage to the diaphragm 70 caused by excessive temperature, and at the same time, it can also make the side wall of the second pressure roller 41 smoother, thereby reducing the situation where the second heating element protrudes from the second pressure roller 41 and causes abnormal deformation of the diaphragm 70.

[0219] While the second pressure roller 41 presses the parts of the two diaphragms 70 that extend beyond the pole piece 60, the second heating element can heat the parts of the two diaphragms 70 that extend beyond the pole piece 60 and allow the parts of the two diaphragms 70 that extend beyond the pole piece 60 to deform and fuse with each other, thereby further improving the bonding effect between the parts of the two diaphragms 70 that extend beyond the pole piece 60 and reducing the occurrence of openings and the like.

[0220] In this embodiment, a second heating element is disposed in the second pressing roller 41 , so that the second pressing roller 41 can heat the portion of the diaphragm 70 extending beyond the pole piece 60 while pressing the diaphragm 70 , thereby better improving the bonding effect between the diaphragms 70 .

[0221] In some embodiments, similar to the first heating element, the heating temperature range of the second heating element is 60℃~90℃; for example, the temperature of the second heating element can be 60℃, 65℃, 70℃, 75℃, 80℃, 85℃, 90℃ or other values.

[0222] The heating temperature range of the second heating element is 60° C. to 90° C., so that the second heating element can not only deform the diaphragm 70 to improve the bonding effect between the diaphragms 70 , but also reduce damage to the diaphragm 70 and the adjacent pole piece 60 .

[0223] Similar to the first heating element, the temperature error range of the second heating element is ±3°C; for example, the temperature error of the second heating element may be ±1°C, ±2°C, ±3°C or other values.

[0224] Affected by factors such as the structure of the second heating element, power supply or other energy supply equipment, and ambient temperature, the heating temperature of the second heating element is not easy to maintain constant. The temperature error range on the second heating element is the temperature fluctuation range allowed by the second heating element. Within this error range, the heating and bonding effects of the second heating element on the diaphragm 70 are similar.

[0225] For example, the temperature of the second heating element can be 60°C. At this time, during the process of the second pressing roller 41 pressing the diaphragm 70, the error range of the second heating element can be ±1°C, that is, the actual temperature range of the second heating element can be 59°C to 61°C. Within this temperature range, the heating effect of the second heating element on the diaphragm 70 is similar; the second heating element can better reduce the damage to the diaphragm 70 and the adjacent pole piece 60 at this temperature.

[0226] For example, the temperature of the second heating element can be 75°C. At this time, during the process of the second pressing roller 41 pressing the diaphragm 70, the error range of the second heating element can be ±2°C, that is, the actual temperature range of the second heating element can be 73°C~77°C. Within this temperature range, the heating effect of the second heating element on the diaphragm 70 is similar; at this temperature, the second heating element can not only improve the bonding effect between the diaphragms 70, but also reduce damage to the diaphragm 70 and the adjacent pole piece 60.

[0227] For example, the temperature of the second heating element can be 90°C. At this time, during the process of the second pressure roller 41 pressing the diaphragm 70, the error range of the second heating element can be ±3°C, that is, the actual temperature range of the second heating element can be 87°C to 93°C. Within this temperature range, the heating effect of the second heating element on the diaphragm 70 is similar; the second heating element can better improve the bonding effect between the diaphragms 70 at this temperature.

[0228] This embodiment provides the heating temperature and error range of the second heating element, so that the second heating element can not only improve the bonding effect, but also reduce the damage of the second heating element to the diaphragm 70 and the adjacent electrode piece 60.

[0229] In some embodiments, a first heating element is provided in the first pressure roller 21, and the temperature difference between the second heating element and the first heating element is in the range of ±5°C; by way of example, the temperature difference between the first heating element and the second heating element can be ±1°C, ±2°C, ±3°C, ±4°C, ±5°C or other values.

[0230] Affected by factors such as the structure of the first heating element and the second heating element, power supply or other energy supply equipment, ambient temperature, etc., the heating temperatures of the first heating element and the second heating element are not easy to maintain constant. The temperature difference between the first heating element and the second heating element is the allowable temperature fluctuation range between the two. Within this temperature difference range, the first heating element and the second heating element have similar heating and bonding effects on the diaphragm 70, and their effects on the pole piece 60 are also similar, thereby reducing the occurrence of deformation and the like caused by uneven heating on both sides of the intermediate structure.

[0231] For example, the temperature difference between the first heating element and the second heating element is ±1°C; at this time, when the heating temperature of the first heating element is 60°C, the temperature range of the second heating element can be 59°C to 61°C; when the heating temperature of the second heating element is 59°C, the temperature range of the second heating element can be 58°C to 60°C.

[0232] For example, the temperature difference between the first heating element and the second heating element is ±3°C; at this time, when the heating temperature of the first heating element is 70°C, the temperature range of the second heating element can be 67°C to 73°C; when the heating temperature of the second heating element is 71°C, the temperature range of the second heating element can be 68°C to 74°C.

[0233] For example, the temperature difference between the first heating element and the second heating element is ±5°C; at this time, when the heating temperature of the first heating element is 80°C, the temperature range of the second heating element can be 75°C to 85°C; when the heating temperature of the second heating element is 85°C, the temperature range of the second heating element can be 80°C to 95°C.

[0234] This embodiment enables the first heating element and the second heating element to not only improve the bonding effect, but also reduce the temperature difference between the two opposite sides of the pole piece 60 to reduce the occurrence of negative situations such as deformation of the pole piece 60.

[0235] refer to Figures 4 to 6 In some embodiments, the second holding structure 40 includes a second adjusting component 43 connected to the second pressing roller 41 , and the second adjusting component 43 is used to adjust the distance between the pressing roller and the bottom roller 10 .

[0236] The second adjustment component 43 refers to a structure in the second pressing structure 40 for adjusting the height of the second pressing roller 41. The second adjustment component 43 can increase or decrease the distance between the second pressing roller 41 and the bottom roller 10 to adapt to the intermediate structure of the electrode assembly 200 of various different thicknesses.

[0237] The second adjustment component 43 may include a cylinder, a hydraulic cylinder or other linear feed components, and may also include a gear rack and a motor and other structures; the second adjustment member can directly adjust the height of the second pressure roller 41, and can also indirectly adjust the height of the second pressure roller 41 by adjusting the height of the second drive shaft 42.

[0238] In the example, the second adjustment component 43 is a cylinder, the telescopic end of the cylinder is connected to a bearing seat, and a bearing is provided in the bearing seat, the second drive shaft 42 is connected to the bearing, and the second drive shaft 42 is outerly provided with a second pressure roller 41; the telescopic end of the cylinder can adjust the height of the bearing seat, thereby adjusting the height of the second drive shaft 42 and the second pressure roller 41, and at the same time it is not easy to interfere with the rotation of the second drive shaft 42.

[0239] In this embodiment, the distance between the second pressing roller 41 and the bottom roller 10 is adjusted by the second adjusting component 43 so that the second pressing roller 41 and the bottom roller 10 can press and hold electrode assemblies 200 of various thicknesses, thereby enabling the winding device 100 to adapt to electrode assemblies 200 of various specifications.

[0240] In some embodiments, a bottom heating element is disposed in the bottom roller 10 , and the bottom heating element is disposed in the bottom roller 10 around the axis of the bottom roller 10 .

[0241] The bottom heating element refers to a structure in the bottom roller 10 that can heat the diaphragm 70 ; the bottom heating element may include a heating wire, a heating plate, a ceramic heating plate or other structures that can generate heat.

[0242] The bottom heating element is arranged around the axis of the bottom roller 10 so that any position on the circumferential direction of the side wall of the bottom roller 10 has heating capability, so as to heat the diaphragm 70 better and more evenly; the bottom heating element is arranged inside the bottom roller 10 to reduce the direct contact between the bottom heating element and the diaphragm 70, thereby reducing the damage to the diaphragm 70 caused by excessive temperature, and at the same time, it can also make the side wall of the bottom roller 10 smoother, reducing the bottom heating element protruding from the bottom roller 10 and causing abnormal deformation of the diaphragm 70.

[0243] While the bottom roller 10 presses the parts of the two diaphragms 70 that extend beyond the pole piece 60, the bottom heating element can heat the parts of the two diaphragms 70 that extend beyond the pole piece 60 and enable the parts of the two diaphragms 70 that extend beyond the pole piece 60 to deform and fuse with each other, thereby further improving the bonding effect between the parts of the two diaphragms 70 that extend beyond the pole piece 60 and reducing the occurrence of openings and the like.

[0244] Because the bottom roller 10 supports the entire intermediate structure, the bottom heating element can also heat the pole piece 60 and the portion of the diaphragm 70 opposite to the pole piece 60, so that the intermediate structure can carry a certain temperature into the next process, thereby facilitating the processing of the next process.

[0245] In this embodiment, a bottom heating element is provided in the bottom roller 10 to heat the electrode assembly 200 through the bottom heating element to reduce the occurrence of negative conditions such as deformation that may be caused by excessive temperature differences on the electrode assembly 200; at the same time, heating the electrode assembly 200 through the bottom heating element can also transport the electrode assembly 200 with the temperature to the next process, so as to facilitate the processing of the electrode assembly 200 in the next process.

[0246] In some embodiments, the heating temperature of the bottom heating element ranges from 30°C to 45°C; for example, the temperature of the bottom heating element can be 30°C, 35°C, 40°C, 45°C or other values.

[0247] The heating temperature range of the bottom heating element is 30°C to 45°C, so that the bottom heating element can not only deform the diaphragm 70 to improve the bonding effect between the diaphragms 70, but also reduce the damage to the diaphragm 70 and the pole piece 60; at the same time, this temperature range can also make the temperature carried by the intermediate structure meet the requirements of the next process and reduce energy consumption.

[0248] The temperature error range of the bottom heating element is ±3°C; for example, the temperature error of the bottom heating element may be ±1°C, ±2°C, ±3°C or other values.

[0249] Affected by factors such as the structure of the bottom heating element, power supply or other energy supply equipment, and ambient temperature, the heating temperature of the bottom heating element is not easy to maintain constant. The temperature error range on the bottom heating element is the temperature fluctuation range allowed by the bottom heating element. Within this error range, the heating and bonding effects of the bottom heating element on the diaphragm 70 are similar.

[0250] For example, the temperature of the bottom heating element can be 30°C, and the error range of the bottom heating element can be ±1°C, that is, the actual temperature range of the bottom heating element can be 29°C to 31°C. Within this temperature range, the heating effect of the bottom heating element on the diaphragm 70 is similar; the bottom heating element can better reduce damage to the diaphragm 70 and the adjacent pole piece 60 at this temperature.

[0251] For example, the temperature of the bottom heating element can be 37.5°C, and the error range of the bottom heating element can be ±2°C, that is, the actual temperature range of the bottom heating element can be 35.5°C to 39.5°C. Within this temperature range, the heating effect of the bottom heating element on the diaphragm 70 is similar; at this temperature, the bottom heating element can not only improve the bonding effect between the diaphragms 70, but also reduce damage to the diaphragm 70 and the pole piece 60.

[0252] For example, the temperature of the bottom heating element can be 45°C, and the error range of the bottom heating element can be ±3°C, that is, the actual temperature range of the bottom heating element can be 42°C to 48°C. Within this temperature range, the heating effect of the bottom heating element on the diaphragm 70 is similar; the bottom heating element can better improve the bonding effect between the diaphragms 70 at this temperature.

[0253] This embodiment enables the bottom heating element to reduce the temperature difference on the electrode assembly 200 and reduce the occurrence of negative effects such as deformation of the electrode assembly 200, and also reduce the power of the bottom heating element, thereby reducing energy consumption.

[0254] In some embodiments, the winding device 100 includes a bottom roller 10, a first pressing structure 20 and a second pressing structure 40, the first pressing structure 20 includes a first pressing roller 21, the second pressing structure 40 includes a second pressing roller 41, the first pressing roller 21 and the second pressing roller 41 are arranged on the same side of the bottom roller 10, and the first pressing roller 21 and the second pressing roller 41 are arranged at intervals along the axial direction of the bottom roller 10.

[0255] The first pressing structure 20 also includes a first drive shaft 221 and a first drive member 222. The first pressing roller 21 is eccentrically sleeved on the first drive shaft 221. The first drive member 222 is coaxially connected to the first drive shaft 221 and can drive the first drive shaft 221 to rotate, so as to drive the first pressing roller 21 to rotate eccentrically. The first drive shaft 221 can drive the first pressing roller 21 to swing back and forth between the first position and the second position, wherein when the first pressing roller 21 is in the first position, the first pressing roller 21 is separated from the middle structure to avoid the pole ear portion 61, and when the first pressing roller 21 is in the second position, the first pressing roller 21 is pressed on the middle structure to press the portion of the diaphragm 70 that protrudes beyond the pole piece 60.

[0256] The first pressing structure 20 further includes a first adjusting assembly 23 . The first adjusting assembly 23 includes a cylinder connected to the first driving shaft 221 . The cylinder can drive the first driving shaft 221 to move closer to or away from the bottom roller 10 to adjust the height of the first pressing roller 21 .

[0257] The first pressing roller 21 is provided with a first heating element to heat the diaphragm 70 .

[0258] The second pressing structure 40 also includes a second driving shaft 42 and a second driving member. The second pressure roller 41 is coaxially sleeved on the second driving shaft 42. The rotation of the second driving shaft 42 can drive the second pressure roller 41 to rotate. At least two second mounting positions 421 are provided on the second driving shaft 42. The second pressure roller 41 can be located in any second mounting position 421, and the distance between the second pressure roller 41 and the first pressure roller 21 in different second mounting positions is different.

[0259] The second pressing structure 40 further includes a second adjusting assembly 43 . The second adjusting assembly 43 includes a cylinder connected to the second driving shaft 42 . The cylinder can drive the second driving shaft 42 to move closer to or away from the bottom roller 10 to adjust the height of the second pressing roller 41 .

[0260] The second pressing roller 41 is provided with a second heating element to heat the diaphragm 70 .

[0261] The winding device 100 also includes a main drive assembly 50, which is directly connected to the bottom roller 10 and can drive the bottom roller 10 to rotate. The main drive assembly 50 is also connected to the second drive shaft 42 through a transmission structure and can drive the second drive shaft 42 to rotate, so that the rotation direction of the second drive shaft 42 is opposite to the rotation direction of the bottom roller 10.

[0262] The bottom roller 10 is provided with a bottom heating element to heat the intermediate structure.

[0263] In the second aspect, the embodiments of the present application also provide a battery production system, including the winding device 100 provided by some embodiments of the first aspect; for example, before the intermediate structure is wound or compounded with another pole piece 60, the winding device 100 can press the diaphragm 70 on the opposite sides of the intermediate structure to prevent the folding defect of the diaphragm 70, and at the same time can also achieve relative fixation of the diaphragm 70 and the pole piece 60.

[0264] During the pressing process of the winding device 100 , the pole lug portion 61 can be avoided to reduce damage to the pole lug portion 61 .

[0265] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A winding device, characterized in that: include: Bottom roller; A first pressing structure, comprising a first pressing roller, the first pressing roller being arranged at a radial interval on one side of the bottom roller to cooperate with the diaphragms on both sides of the pole piece for pressing, and a gap for the diaphragms on both sides of the pole piece to pass through is formed between the first pressing roller and the bottom roller; The length of the first pressing roller is smaller than that of the bottom roller, so that the first pressing roller is used to press the portion of the diaphragm that extends beyond the pole piece.

2. The winding device according to claim 1, characterized in that The first pressing structure further includes a first driving assembly, and the first driving assembly is used to drive the first pressing roller to move so as to change the size of the gap in the radial direction of the bottom roller.

3. The winding device according to claim 2, characterized in that The first pressing roller has at least a first position and a second position; When the first pressing roller is located at the first position, a first gap is formed between the first pressing roller and the bottom roller; When the first pressing roller is located at the second position, a second gap is formed between the first pressing roller and the bottom roller; In the radial direction of the bottom roller, the difference between the size of the first gap and the size of the second gap ranges from 1 mm to 3 mm.

4. The winding device according to claim 2, characterized in that The first driving assembly includes a first driving shaft, the first driving shaft is connected to the first pressing roller, and the first driving shaft is used to drive the first pressing roller to rotate so as to change the size of the gap in the radial direction of the bottom roller.

5. The winding device according to claim 4, characterized in that The first pressing roller is eccentrically arranged relative to the axis of the first driving shaft, and the first driving shaft is used to drive the first pressing roller to rotate so as to change the size of the gap in the radial direction of the bottom roller.

6. The winding device according to claim 5, characterized in that In the radial direction of the bottom roller, the distance between the axis of the first pressure roller and the axis of the first driving shaft ranges from 3 mm to 5 mm.

7. The winding device according to claim 4, characterized in that The first pressing roller is coaxially arranged with the first driving shaft, and a avoidance groove is arranged on the side wall of the first pressing roller, and the length direction of the avoidance groove is parallel to the axial direction of the first pressing roller.

8. The winding device according to claim 4, characterized in that At least two first installation positions are provided on the first driving shaft along the axial direction of the first driving shaft; The first pressing roller is detachably sleeved on the first driving shaft, and the first pressing roller can be located at any of the first installation positions.

9. The winding device according to claim 4, characterized in that The first driving assembly further includes a first driving member, which is connected to the first driving shaft and is used to drive the first driving shaft to rotate.

10. The winding device according to any one of claims 1 to 9, characterized in that A first heating element is disposed in the first pressing roller, and the first heating element is disposed in the first pressing roller around the axis of the first pressing roller.

11. The winding device according to claim 10, characterized in that The heating temperature range of the first heating element is 60° C. to 90° C., and the temperature error range of the first heating element is ±3° C.

12. The winding device according to any one of claims 1 to 9, characterized in that The first pressing structure further includes a first adjusting component connected to the first pressing roller, and the first adjusting component is used to adjust the distance between the first pressing roller and the bottom roller.

13. The winding device according to any one of claims 1 to 9, characterized in that The winding device further comprises a second pressing structure, wherein the second pressing structure comprises a second pressing roller, and the length of the second pressing roller is less than the length of the first pressing roller; Along a direction parallel to the axis of the bottom roller, the second pressing roller and the first pressing roller are arranged on the same side of the bottom roller and are spaced apart so as to press the portions of the diaphragms on opposite sides of the pole piece that extend beyond the pole piece.

14. The winding device according to claim 13, characterized in that The distance between the second pressing roller and the first pressing roller ranges from 50 mm to 250 mm.

15. The winding device according to claim 13, characterized in that The second pressing structure includes a second driving shaft, and the second driving shaft is connected to the second pressing roller and is used for driving the second pressing roller to rotate.

16. The winding device according to claim 15, characterized in that At least two second mounting positions are provided on the second driving shaft along the axial direction of the second driving shaft; The second pressing roller is detachably sleeved on the second driving shaft, and the second pressing roller can be located at any of the second installation positions.

17. The winding device according to claim 15, characterized in that The winding device further comprises a main driving assembly, wherein the main driving assembly is used for driving the bottom roller and the second driving shaft to rotate, and the bottom roller and the second driving shaft rotate in opposite directions.

18. The winding device according to claim 13, characterized in that A second heating element is disposed in the second pressing roller, and the second heating element is disposed in the second pressing roller around the axis of the second pressing roller.

19. The winding device according to claim 18, characterized in that The heating temperature range of the second heating element is 60° C. to 90° C., and the temperature error range of the second heating element is ±3° C.

20. The winding device according to claim 19, characterized in that A first heating element is disposed in the first pressing roller, and a temperature difference between the second heating element and the first heating element is within a range of ±5°C.

21. The winding device according to claim 13, characterized in that The second pressing structure includes a second adjusting component connected to the second pressing roller, and the second adjusting component is used to adjust the distance between the pressing roller and the bottom roller.

22. The winding device according to any one of claims 1 to 9, characterized in that A bottom heating element is arranged inside the bottom roller, and the bottom heating element is arranged inside the bottom roller around the axis of the bottom roller.

23. The winding device according to claim 22, characterized in that The heating temperature range of the bottom heating element is 30°C to 45°C, and the temperature error range of the bottom heating element is ±3°C.

24. A battery production system, characterized in that: Comprising a winding device as claimed in any one of claims 1-23.

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