Winding needle and winding equipment

Abstract

The utility model provides a winding needle and winding equipment, and the winding needle comprises a winding needle main body which is provided with a containing groove; the fixing assembly is accommodated in the accommodating groove, and the fixing assembly is used for fixing part of the electrode assembly in the winding needle main body; the depth of the accommodating groove is smaller than the diameter of the winding needle main body in the radial direction of the winding needle main body; according to the winding needle provided by the invention, the accommodating groove is formed in the winding needle main body, so that the part of the electrode assembly is accommodated through the accommodating groove, and meanwhile, the fixing assembly is arranged in the accommodating groove, so that the part of the electrode assembly is fixed in the accommodating groove through the fixing assembly; therefore, when the winding needle rotates and winds the electrode assembly, the electrode assembly is not easy to slip to cause idle running of the winding needle; the depth of the containing groove is smaller than the diameter of the winding needle body, so that the electrode assembly is not prone to penetrating through the winding needle, the process that the winding needle clamps the electrode assembly can be simplified, the electrode assembly is not prone to extending out of the winding needle from the other end of the winding needle, and the structure of the wound electrode assembly can be more concise.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a winding needle and winding equipment. 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 production process of batteries, the winding of electrode assemblies is a very important process, and electrode assemblies usually need to be wound through winding needles. At present, when winding electrode assemblies, they usually need to pass through winding needles first, and then be clamped and wound by winding needles, which makes the process of clamping the electrode sheets by winding needles more cumbersome and inefficient. Utility Model Content

[0004] In view of the above problems, the present application provides a winding needle and a winding device, which can simplify the process of the winding needle clamping the electrode assembly.

[0005] In a first aspect, an embodiment of the present application provides a winding needle for winding an electrode assembly, the winding needle comprising:

[0006] A winding needle body, wherein a receiving groove is provided on the winding needle body;

[0007] A fixing assembly is contained in the containing groove, and is used to fix a part of the electrode assembly in the winding needle body;

[0008] In the radial direction of the winding needle body, the depth of the accommodating groove is smaller than the diameter of the winding needle body.

[0009] In the technical solution of this embodiment, a receiving groove is opened on the winding needle body to accommodate part of the electrode assembly through the receiving groove, and a fixing assembly is arranged in the receiving groove to fix part of the electrode assembly in the receiving groove through the fixing assembly, so that when the winding needle rotates and winds the electrode assembly, the electrode assembly is not easy to slip and cause the winding needle to rotate idle; at the same time, the depth of the receiving groove is made smaller than the diameter of the winding needle body, so that the electrode assembly is not easy to pass through the winding needle, thereby simplifying the process of the winding needle clamping the electrode assembly, and the electrode assembly is not easy to extend from the other end of the winding needle to the outside of the winding needle, so that the structure of the electrode assembly after winding can also be simpler.

[0010] In some embodiments, the fixing assembly includes a balloon for fixing a portion of the electrode assembly to the winding needle body after the balloon is filled with fluid.

[0011] In the technical solution of this embodiment, the fixing component includes an airbag, and the electrode assembly is fixed by filling the airbag with fluid. Compared with the mechanical structure, the airbag structure is simpler and the airbag has a lower demand on the internal space of the winding needle.

[0012] In some embodiments, the airbag is connected to the inner wall of the receiving tank, and the airbag is used to press a portion of the electrode assembly against the inner wall on the other side of the receiving tank after the fluid is filled.

[0013] The technical solution of this embodiment provides a specific method of fixing the electrode assembly with an airbag, so that after the airbag is filled with fluid, the electrode assembly can be pressed against the inner wall of the receiving groove, so as to clamp the electrode assembly between the airbag and the inner wall of the receiving groove; by using the airbag to press part of the electrode assembly against the rigid inner wall of the receiving groove, the electrode assembly can be fixed better and more stably.

[0014] In some embodiments, the number of the airbags is at least two, and the at least two airbags are arranged relative to each other with a spacing therebetween. The two relatively arranged airbags are used to cooperate with each other to clamp a portion of the electrode assembly after being filled with fluid.

[0015] The technical solution of this embodiment provides another specific method of fixing the electrode assembly with airbags, so that at least two airbags are arranged opposite to each other and the electrode assembly is clamped between the two airbags to fix part of the electrode assembly in the winding needle body, while also reducing damage to the electrode assembly.

[0016] In some embodiments, the needle winding body includes an inner needle and an outer needle sleeved on the inner needle, and the receiving groove is formed on the outer needle.

[0017] The technical solution of this embodiment provides a specific structure of the winding needle body, and the accommodating groove is set on the outer needle of the winding needle, so that the winding needle is not easy to pass through the inner needle and extend outside the winding needle body, thereby better making the structure of the electrode assembly after winding more concise.

[0018] In some embodiments, the outer needle includes two sub-needle bodies that are opposite to each other and spaced apart, the two sub-needle bodies are detachably connected to the inner needle, and the accommodating groove is formed between the two sub-needle bodies.

[0019] In the technical solution of this embodiment, the outer needle includes two sub-needle bodies that are relatively spaced apart, so as to facilitate the disassembly, installation and maintenance of the outer needle, and also facilitate the formation of the accommodating groove.

[0020] In some embodiments, a material discharge groove is also provided on the peripheral side of the winding needle body;

[0021] In the axial direction of the winding needle body, at least one end of the material discharge groove is communicated with the space outside the winding needle body.

[0022] In the technical solution of this embodiment, a material unloading groove is provided on the winding needle body, so as to facilitate the unloading device to enter the wound electrode assembly and remove the electrode assembly from the winding needle.

[0023] In a second aspect, some embodiments of the present application further provide a winding device, comprising:

[0024] A feeding assembly, used for providing an intermediate structure of the electrode assembly;

[0025] The winding assembly is arranged downstream of the feeding assembly and is used to wind the intermediate structure. The winding assembly includes a base and at least two winding needles provided in some embodiments of the first aspect and arranged on the base. The base is used to drive different winding needles to move alternately to one side of the feeding assembly in sequence.

[0026] In the technical solution of this embodiment, the winding equipment includes a feeding assembly and a winding assembly, and the base of the winding assembly can drive the winding needle to move alternately to one side of the feeding assembly in sequence, so that the feeding assembly can continuously provide electrode assemblies, and the winding needle can move alternately to one side of the feeding assembly and wind the electrode assembly, thereby improving the efficiency of the winding equipment.

[0027] In some embodiments, the winding assembly further includes a cutting structure and a blowing structure disposed on one side of the base, the cutting structure being used to cut off the intermediate structure, and the blowing structure being used to blow part of the intermediate structure into the containing groove.

[0028] In the technical solution of this embodiment, the winding assembly includes a cutting structure and a blowing structure. The electrode assembly is cut by the cutting structure, and the cut electrode assembly is blown into the installation groove by the blowing structure to facilitate the airbag to be fixed into the middle structure of the installation groove, thereby simplifying the process of the electrode assembly entering the winding needle and the winding needle clamping the electrode assembly.

[0029] In some embodiments, the winding assembly further comprises a first station and a second station located at different positions, and the first station is located on one side of the feeding assembly;

[0030] The base is used to drive the winding needle to move from the first station to the second station, and the cutting structure and the blowing structure are located between the first station and the second station.

[0031] In the technical solution of this embodiment, the winding assembly includes a first workstation and a second workstation, so that the winding needle located at the first workstation can play the role of winding the electrode assembly, and the winding needle located at the second workstation can play the role of finishing. The finishing process is set at a position other than the winding position, so that when one winding needle is in the finishing process, another winding needle can perform the winding process, thereby further improving the production efficiency of the winding equipment.

[0032] In some embodiments, the winding assembly further includes a first displacement structure, and the first displacement structure is used to drive the cutting structure and the blowing structure to move relative to the base to avoid the winding needle.

[0033] In the technical solution of this embodiment, the cutting structure and the blowing structure are enabled to move relative to the base through the first displacement structure. Since the base needs to drive different winding needles to move alternately to one side of the feeding assembly in turn, the movement of the cutting structure and the blowing structure relative to the base can reduce the interference of the two on the movement of the winding needles.

[0034] In some embodiments, the winding assembly further comprises a third station;

[0035] The winding assembly comprises at least three winding needles, and the base can drive the three winding needles to be located at a first station, a second station and a third station respectively.

[0036] In the technical solution of this embodiment, the winding assembly includes a third station, and the unloading device is capable of removing the electrode assembly from the winding needle at the third station. At the same time, when a winding needle is located at the third station, there are winding needles at both the first station and the second station to reduce the mutual influence of each process and further improve the production efficiency of the winding equipment.

[0037] In some embodiments, the winding assembly further includes a holding structure, which is located on one side of the feeding assembly and is used to hold the intermediate structure against the winding needle.

[0038] In the technical solution of this embodiment, the winding assembly also includes a pressing structure, which presses the electrode assembly onto the winding needle to reduce the gap between the electrode assembly and the winding needle, thereby reducing the gap between the electrode sheet and the diaphragm, and between the diaphragms in the wound electrode assembly.

[0039] In some embodiments, the winding assembly further includes a second displacement structure, and the second displacement structure is used to drive the holding structure to move relative to the base to avoid the winding needle.

[0040] In the technical solution of this embodiment, the holding structure is enabled to move relative to the base through the first displacement structure. Since the base needs to drive different winding needles to move alternately to one side of the feeding assembly in sequence, the movement of the holding structure relative to the base can reduce the interference of the two on the movement of the winding needles.

[0041] 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

[0042] 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 accompanying drawings;

[0043] Figure 1 It is a schematic diagram of the structure of the electrode assembly after the current needle winding;

[0044] Figure 2 A schematic diagram of the structure of an electrode assembly after needle winding provided in some embodiments of the present application;

[0045] Figure 3 A three-dimensional diagram of a winding needle provided in some embodiments of the present application Figure 1 ;

[0046] Figure 4 A three-dimensional diagram of a winding needle provided in some embodiments of the present application Figure 2 ;

[0047] Figure 5 A schematic front view of a winding needle provided in some embodiments of the present application;

[0048] Figure 6 A schematic side view of a winding needle provided in some embodiments of the present application;

[0049] Figure 7 A three-dimensional schematic diagram of an air bag in a rolling needle provided in some embodiments of the present application;

[0050] Figure 8 A schematic front view of an air bag in a winding needle provided in some embodiments of the present application;

[0051] Fig. 9 A schematic diagram of the structure of a winding device provided in some embodiments of the present application.

[0052] The meanings of the marks in the figure are:

[0053] 1000. Winding equipment;

[0054] 100. Feeding assembly;

[0055] 200, winding assembly; 2001, first station; 2002, second station; 2003, third station;

[0056] 10. winding needle; 11. winding needle body; 111. inner needle; 112. outer needle; 1121. receiving groove; 1122. feeding groove; 1123. sub-needle body; 12. air bag;

[0057] 20. Base;

[0058] 30. Cut off the structure;

[0059] 40. Air blowing structure;

[0060] 50. Pressing structure;

[0061] 300. Electrode assembly;

[0062] 60. Anode sheet;

[0063] 70. Diaphragm;

[0064] 80. Cathode sheet. DETAILED DESCRIPTION

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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).

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In the battery production process, winding of the electrode assembly is a very important process, and the electrode assembly usually includes an anode sheet, a separator, a cathode sheet and another separator wound by a winding device. In the current winding process, the feed assembly usually first passes the separator, the cathode sheet and another separator through the winding needle and then composites them, and then composites the anode sheet to obtain the intermediate structure of the electrode assembly.

[0075] The intermediate structure is cut off on the side of the winding needle away from the feeding assembly, and part of the intermediate structure is located on the side of the winding needle away from the feeding assembly; then, the winding needle clamps the intermediate structure and rotates to wind and form an electrode assembly, and finally obtains an electrode assembly.

[0076] Based on the above analysis, the current method of fixing the electrode assembly with the winding needle is relatively complicated; at the same time, because part of the intermediate structure passes through the winding needle when the winding needle is wound and is located at the end of the winding needle away from the feeding assembly, when the winding needle rotates, this part of the intermediate structure will be pressed by the intermediate structure on the side of the feeding assembly and cause the end of the electrode assembly to bend. Figure 1 The figure shows the electrode assembly formed after the current needle winding. Figure 1 It can be seen that two layers of adjacent anode sheets appear at the end of the wound electrode assembly. This structure causes the risk of opening of the electrode assembly, which can easily affect the stability and yield of the electrode assembly.

[0077] Based on the above considerations, in order to simplify the process of the winding needle clamping the electrode assembly, and at the same time to improve the stability and yield of the electrode assembly, an embodiment of the present application provides a winding needle, in which a receiving groove is opened on the winding needle body to accommodate part of the intermediate structure through the receiving groove, and a fixing component is arranged in the receiving groove to fix the part of the intermediate structure in the receiving groove through the fixing component; at the same time, the depth of the receiving groove is made smaller than the diameter of the winding needle body.

[0078] refer to Figure 2 In such a winding needle, the fixing component can fix part of the intermediate structure in the accommodating groove, so that when the winding needle rotates and winds the intermediate structure, the intermediate structure is not easy to slip and cause the winding needle to rotate idly; at the same time, the intermediate structure is not easy to pass through the winding needle, which can simplify the process of the winding needle clamping the intermediate structure; the intermediate structure is also not easy to extend from the other end of the winding needle to the outside of the winding needle, so that the structure of the electrode assembly after winding can also be simpler, and it is not easy to have two layers of adjacent anode sheets.

[0079] The winding device provided in the embodiment of the present application can be wound to form a cylindrical electrode assembly, or it can be wound to form a prismatic electrode assembly or an electrode assembly of other shapes. The electrode assembly formed by the winding device can be used as a component for electrochemical reaction in a battery cell, and the battery cell can be used in an electrical device that uses a battery as a power source or 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, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, spacecrafts, and the like.

[0080] For the convenience of explanation, the following embodiments are described by taking a winding device 1000 according to some embodiments of the present application for forming a square electrode assembly 300 as an example.

[0081] First, reference Figures 3 to 6An embodiment of the present application provides a winding needle 10, including a winding needle body 11 and a fixing component; wherein a receiving groove 1121 is opened on the winding needle body 11; the fixing component is accommodated in the receiving groove 1121, and the fixing component is used to fix part of the electrode assembly 300 in the winding needle body 11; in the radial direction of the winding needle body 11, the depth of the receiving groove 1121 is less than the diameter of the winding needle body 11.

[0082] Figures 3 to 5 In the figure, the direction where the X-axis is located is the axial direction of the winding needle body 11, and the direction where the Y-axis is located is the radial direction of the winding needle body 11.

[0083] The winding needle body 11 refers to the main structure of the winding needle 10, and the electrode assembly 300 can be wound on the winding needle body 11 during the winding process of the winding needle 10; the winding needle body 11 can be a split structure, for example, it can be divided into two or more parts, and the winding needle body 11 can also be an inseparable whole; the shape of the winding needle body 11 can be cylindrical, or it can be a polygonal column or other shapes; the material of the winding needle body 11 can include metal, plastic or other materials.

[0084] It can be understood that the electrode assembly 300 can be formed after the winding needle body 11 is wound, and before the winding needle body 11 is wound, the structure wound on the winding needle body 11 is an intermediate structure of the electrode assembly 300. The intermediate structure may include a pole piece and a diaphragm 70. The pole piece and the diaphragm 70 may be compounded, and the intermediate structure is the structure after the pole piece and the diaphragm 70 are compounded. The pole piece and the diaphragm 70 may not be compounded, and the intermediate structure includes the pole piece and the diaphragm 70.

[0085] The receiving groove 1121 refers to a groove structure provided on the winding needle body 11, and the receiving groove 1121 is used to accommodate part of the intermediate structure, for example, the receiving groove 1121 is used to accommodate the end part of the intermediate structure after it is cut off; the receiving groove 1121 has an opening facing the outside so that part of the intermediate structure can enter therein; the length direction of the receiving groove 1121 is parallel to the axial direction (X) of the winding needle body 11, and can also be inclined relative to the axial direction (X) of the winding needle body 11; along the width direction of the receiving groove 1121, the cross-sectional shape of the receiving groove 1121 can be square, semicircular, trapezoidal or other shapes.

[0086] The fixing component refers to a structure in the winding needle 10 for fixing the intermediate structure. The fixing component is accommodated in the accommodating groove 1121 to fix the portion of the intermediate structure entering the accommodating groove 1121 in the accommodating groove 1121, thereby reducing the slippage of the intermediate structure relative to the winding needle body 11 during the rotation of the winding needle body 11; at the same time, the fixing component is accommodated in the accommodating groove 1121, which can also reduce the contact between the fixing component and the intermediate structure, thereby reducing damage to the electrode or diaphragm 70.

[0087] The fixing component may also include a variety of structures; in some embodiments, the fixing component may include a telescopic cylinder that can extend and press part of the intermediate structure against the inner wall of the accommodating groove 1121; in other embodiments, the fixing component may also be an electric clamp that can clamp the intermediate structure that enters the accommodating groove 1121 to fix the intermediate structure; the fixing component may also include other structures, not limited to the above two.

[0088] The depth of the receiving groove 1121 refers to the depth of the receiving groove 1121 in the radial direction (Y) of the winding needle body 11. The depth of the receiving groove 1121 is positively correlated with the length of the intermediate structure that can enter the receiving groove 1121. The greater the depth of the receiving groove 1121, the longer the length of the intermediate structure that can enter the receiving groove 1121, and the easier it is for the fixing component to fix the intermediate structure in the receiving groove 1121.

[0089] The diameter of the winding needle body 11 refers to the size of the winding needle body 11 perpendicular to its axial direction (X), that is, the size of the winding needle body 11 in its radial direction (Y). Figure 6 The dimension H shown in the figure is the depth of the accommodating groove 1121, and the dimension R shown in the figure is the diameter of the winding needle body 11; the depth of the accommodating groove 1121 is smaller than the diameter of the winding needle body 11, that is, the accommodating groove 1121 is not easy to penetrate the winding needle body 11. This setting makes it difficult for the intermediate structure to pass through the winding needle body 11, and makes it difficult for the intermediate structure to extend to the other side of the winding needle 10, so that the winding needle 10 is not easy to have a bending part during the winding process, thereby reducing the occurrence of the double-layer anode sheet 60.

[0090] If a method of using a split outer needle and inner needle to clamp the intermediate structure is adopted, a corresponding driving structure needs to be set up to drive the split outer needles to approach each other to clamp the intermediate structure. The clamping structure and the action process are relatively complicated, and it is also easy to cause the diameter of the winding needle 10 to change. In this embodiment, the setting of the fixing component makes it possible for the winding needle 10 to not rely on the split outer needle and inner needle to clamp the intermediate structure, thereby simplifying the process of clamping and fixing the intermediate structure of the winding needle 10.

[0091] Furthermore, since the intermediate structure passes through the winding needle body 11, it is easy to cause the part passing through the winding needle body 11 to be bent, and it is easy to cause the same-pole pieces to be adjacent to each other, which can easily lead to a low yield of the electrode assembly 300; if a winding needle with a split outer needle and inner needle structure is used, it is necessary to process the part of the intermediate structure passing through the winding needle body 11 (for example, cut off the part of the intermediate structure passing through the winding needle body 11) to improve the yield, and the process is relatively cumbersome; in this embodiment, the intermediate structure is not easy to pass through the winding needle body 11, so there is no need to process the intermediate structure, thereby further simplifying the process of clamping and fixing the intermediate structure of the winding needle 10.

[0092] In this embodiment, a receiving groove 1121 is opened on the winding needle body 11 to accommodate part of the intermediate structure through the receiving groove 1121, and a fixing component is arranged in the receiving groove 1121 to fix part of the intermediate structure in the receiving groove 1121 through the fixing component, so that when the winding needle 10 rotates and winds the intermediate structure, the intermediate structure is not easy to slip and cause the winding needle 10 to rotate idly; at the same time, the depth of the receiving groove 1121 is made smaller than the diameter of the winding needle 10 body, so that the intermediate structure is not easy to pass through the winding needle 10, thereby simplifying the process of the winding needle 10 clamping the intermediate structure; the intermediate structure is also not easy to extend from the other end of the winding needle 10 to the outside of the winding needle 10, refer to Figure 2 , so that the structure of the wound electrode assembly 300 can be more concise, and it is less likely to have two layers of adjacent anode sheets 60.

[0093] refer to Figures 3 to 8 In some embodiments, the fixing assembly includes an air bag 12, and the air bag 12 is used to fix a portion of the electrode assembly 300 to the winding needle body 11 after being filled with fluid.

[0094] The airbag 12 refers to a structure that can change its volume after being filled with fluid. The airbag 12 can be filled with gas or liquid. The volume of the airbag 12 can increase after being filled with fluid, and the volume of the airbag 12 can also decrease after the fluid is discharged. The shape of the airbag 12 after being filled with fluid can be cylindrical, prismatic or other shapes. The number of airbags 12 can be one, two or more. Since the fixing component is arranged in the receiving groove 1121, the specific number of airbags 12 can be set according to parameters such as the volume of the airbag 12 after being filled with fluid and the capacity of the receiving groove 1121. The material of the airbag 12 may include rubber, metal or other materials.

[0095] For example, the airbag 12 is a columnar structure and there are a plurality of them, and the plurality of airbags 12 are spaced and evenly arranged along the axial direction (X) of the winding needle body 11 .

[0096] The airbag 12 can fix part of the intermediate structure to the winding needle body 11 after being filled with fluid. The airbag 12 specifically fixes the part of the intermediate structure that enters the receiving groove 1121. The airbag 12 can fix the intermediate structure in a variety of different ways. For example, the airbag 12 can press the intermediate structure against the inner wall of the receiving groove 1121 after being filled with fluid. For another example, an airbag 12 of a special shape can be provided or a different arrangement of the airbag 12 can be provided so that the airbag 12 can clamp the intermediate structure after being filled with fluid.

[0097] Because the volume of the airbag 12 will decrease after the fluid is discharged, and the structure of the airbag 12 is relatively simple, the fixing component including the airbag 12 can reduce the space requirement of the fixing component; because the airbag 12 is filled with fluid, the airbag 12 can also have a certain elasticity after being filled with fluid, so the fixing component including the airbag 12 can also reduce the damage to the electrode plate and the diaphragm 70 that may be caused when the fixing component fixes the intermediate structure, thereby protecting the electrode assembly 300.

[0098] In this embodiment, the fixing component includes an airbag 12, and the airbag 12 is filled with fluid to fix the intermediate structure of the electrode assembly 300. Compared with the mechanical structure, the airbag 12 has a simpler structure, which can reduce space occupancy and reduce damage to the electrode plate and the diaphragm 70.

[0099] refer to Figures 3 to 8 In some embodiments, the airbag 12 is connected to the inner wall of the receiving groove 1121, and the airbag 12 is used to press a portion of the electrode assembly 300 against the inner wall on the other side of the receiving groove 1121 after the fluid is filled.

[0100] The accommodating groove 1121 is opened on the winding needle body 11, and the accommodating groove 1121 has multiple inner walls facing the interior, such as oppositely arranged side walls, a bottom wall opposite to the opening, etc.; the airbag 12 is connected to the inner wall of the accommodating groove 1121, and the airbag 12 can be connected to the oppositely arranged side walls of the accommodating groove 1121, and can also be connected to the bottom wall of the accommodating groove 1121 opposite to the opening.

[0101] After the airbag 12 is filled with fluid, the volume of the airbag 12 increases and can press the intermediate structure in the receiving groove 1121 against the inner wall on the other side of the receiving groove 1121. At this time, the intermediate structure is clamped between the inner wall of the receiving groove 1121 and the airbag 12, thereby achieving a fixing effect.

[0102] For example, when the airbag 12 is connected to the bottom wall of the receiving groove 1121 , the airbag 12 can be filled with fluid to press the intermediate structure against any side wall of the receiving groove 1121 .

[0103] For example, when the airbag 12 is connected to the side wall of the receiving groove 1121, the airbag 12 is filled with fluid to press the intermediate structure against the other opposite side wall.

[0104] Since the inner wall of the receiving groove 1121 is a rigid structure, the airbag 12 can press the intermediate structure against the inner wall of the receiving groove 1121 to relatively stably fix the intermediate structure in the receiving groove 1121, so that the intermediate structure is not easy to slip during the rotation and winding of the winding needle body 11, causing the winding needle body 11 to idle.

[0105] The present embodiment provides a specific method for the airbag 12 to fix the intermediate structure of the electrode assembly 300, so that after the airbag 12 is filled with fluid, the intermediate structure can be pressed against the inner wall of the receiving groove 1121, so as to clamp the intermediate structure between the airbag 12 and the inner wall of the receiving groove 1121; by pressing part of the intermediate structure against the rigid inner wall of the receiving groove 1121 through the airbag 12, the intermediate structure can be fixed better and more stably.

[0106] In some embodiments, there are at least two airbags 12 , and the at least two airbags 12 are arranged opposite to each other with a spacing therebetween. The two oppositely arranged airbags 12 are used to press a portion of the electrode assembly 300 therebetween after being filled with fluid.

[0107] There are at least two airbags 12, that is, the number of airbags 12 can be two, or three or more; at least two airbags 12 are arranged relatively spaced apart, that is, only two airbags 12 can be arranged relatively spaced apart, or four airbags 12 can be arranged relatively spaced apart in pairs; multiple airbags 12 can be arranged relatively spaced apart in pairs, or only some of the airbags 12 can be arranged relatively spaced apart.

[0108] When entering the receiving groove 1121, the middle structure of the electrode assembly 300 can enter between two relatively spaced airbags 12. When the airbags 12 are filled with fluid, the two relatively spaced airbags 12 can clamp the middle structure therebetween to fix the middle structure.

[0109] Since the airbag 12 is filled with fluid, the airbag 12 can also have a certain elasticity after being filled with fluid. The relatively spaced airbags 12 fixing the intermediate structure can further reduce the damage to the pole piece and the diaphragm 70 that may be caused in the process of fixing the intermediate structure.

[0110] This embodiment provides another specific method of fixing the intermediate structure of the electrode assembly 300 with the airbag 12, so that at least two airbags 12 are arranged opposite to each other, and the intermediate structure is clamped between the two airbags 12 to fix part of the intermediate structure in the winding needle body 11, while also reducing damage to the electrode and the diaphragm 70.

[0111] refer to Figures 3 to 6 In some embodiments, the needle winding body 11 includes an inner needle 111 and an outer needle 112 sleeved on the inner needle 111 , and the accommodating groove 1121 is formed on the outer needle 112 .

[0112] The inner needle 111 refers to a structure located inside the winding needle body 11. The inner needle 111 can be connected to an external driving structure, that is, the external driving structure can drive the winding needle body 11 to rotate by driving the inner needle 111; the shape of the inner needle 111 can be cylindrical, prismatic or other shapes; the material of the inner needle 111 can include plastic, metal or other materials.

[0113] The outer needle 112 refers to the structure in which the winding needle body 11 is in direct contact with the intermediate structure. During the winding process of the winding needle body 11, the intermediate structure is wound on the outer needle 112; the outer needle 112 can be an integral structure, or it can be formed by piecing together multiple structural parts; because the outer needle 112 is sleeved on the inner needle 111, the shape of the outer needle 112 can be a cylindrical tube, or it can be a prismatic tube or other shapes; the material of the outer needle 112 can include plastic, metal or other materials, and the material of the outer needle 112 and the inner needle 111 can be the same or different.

[0114] The outer needle 112 is arranged outside the inner needle 111, that is, the outer needle 112 covers at least part of the inner needle 111 along the circumference of the inner needle 111, so that the intermediate structure can be wrapped around the outer needle 112; the outer needle 112 can be detachably connected to the inner needle 111 by screwing, snapping or other means, and can also be fixedly connected to the inner needle 111 by bonding, welding or other means.

[0115] Because the accommodating groove 1121 is opened on the outer needle 112, and because of the setting of the inner needle 111, the intermediate structure is not easy to pass through the inner needle 111 and penetrate the winding needle body 11, that is, the intermediate structure is not easy to extend to the other side of the winding needle body 11, so that the winding needle 10 is not easy to have bending parts during the winding process, thereby reducing the occurrence of double-layer anode sheets 60.

[0116] This embodiment provides a specific structure of the winding needle body 11, and sets the accommodating groove 1121 on the outer needle 112 of the winding needle 10, so that the winding needle 10 is not easy to pass through the inner needle 111 and extend outside the winding needle 10 body, thereby better making the structure of the wound electrode assembly 300 more concise.

[0117] refer to Figures 3 to 6 In some embodiments, the outer needle 112 includes two sub-needle bodies 1123 that are opposite to each other and spaced apart. The two sub-needle bodies 1123 can be detachably connected to the inner needle 111 , and the accommodating groove 1121 is formed between the two sub-needle bodies 1123 .

[0118] The sub-needle body 1123 refers to a structure that can be assembled to form the outer needle 112. Since the outer needle 112 is sleeved on the inner needle 111, the sub-needle body 1123 is arranged outside the inner needle 111; according to the shape of the outer needle 112, the shape of the sub-needle body 1123 can be an arc-shaped sheet or other shapes; the material of the sub-needle body 1123 can include metal, plastic or other materials.

[0119] The sub-needle body 1123 is detachably connected to the inner needle 111 , and the sub-needle body 1123 can be detachably connected to the inner needle 111 by screwing, snapping or other means; making the sub-needle body 1123 detachably connected to the inner needle 111 can facilitate the installation, replacement and maintenance of the outer needle 112 .

[0120] The two sub-needle bodies 1123 are arranged opposite to each other, that is, the two sub-needle bodies 1123 are symmetrical relative to the axis of the winding needle body 11; and because the outer needle 112 is sleeved on the inner needle 111, the two sub-needle bodies 1123 are also arranged on the peripheral side of the inner needle 111 along the circumference of the winding needle body 11.

[0121] The two sub-needle bodies 1123 are arranged at intervals to form a receiving groove 1121 between the two sub-needle bodies 1123. At this time, the side wall of the receiving groove 1121 is the outer wall surface of the sub-needle body 1123, and the bottom wall of the receiving groove 1121 is the outer wall surface of the inner needle 111; accordingly, the intermediate structure is not easy to pass through the inner needle 111 and extend to the other side of the winding needle body 11, so that the winding needle 10 is not easy to have bending parts during the winding process, thereby reducing the occurrence of double-layer anode sheets 60.

[0122] In this embodiment, the outer needle 112 includes two sub-needle bodies 1123 that are relatively spaced apart from each other, so as to facilitate the disassembly, installation and maintenance of the outer needle 112 and also facilitate the formation of the accommodating groove 1121 .

[0123] refer to Figures 3 to 6 In some embodiments, a material discharge groove 1122 is further provided on the peripheral side surface of the winding needle body 11 ; in the axial direction of the winding needle body 11 , at least one end of the material discharge groove 1122 is connected to the space outside the winding needle body 11 .

[0124] The material discharge groove 1122 refers to a groove structure on the winding needle 10 for accommodating a material picking device. The material discharge groove 1122 is opened on the peripheral side surface of the winding needle body 11, that is, the opening of the material discharge groove 1122 faces the outside of the winding needle body 11. After the intermediate structure is wound around the winding needle body 11, the intermediate structure can close the opening of the material discharge groove 1122; the length direction of the material discharge groove 1122 can be parallel to the axial direction (X) of the winding needle body 11, or it can be set at an angle to the axial direction (X) of the winding needle body 11; at least one end of the material discharge groove 1122 along the axial direction (X) of the winding needle body 11 is connected to the space outside the winding needle body 11, so as to facilitate the material picking device to enter the material discharge groove 1122; along the depth direction of the material discharge groove 1122, the cross-sectional shape of the material discharge groove 1122 can be square, semicircular, trapezoidal or other shapes.

[0125] In such a winding needle 10, the material picking device can enter the discharge groove 1122 along the axial direction (X) of the winding needle body 11, and can also move in the direction away from the axis of the winding needle body 11, and can move from the opening of the discharge groove 1122 to the outside of the winding needle body 11 to contact the electrode assembly 300; after contacting the electrode assembly 300, the material picking device can continue to move in the direction away from the axis of the winding needle body 11 and separate the electrode assembly 300 from the winding needle body 11, so as to facilitate the removal of the electrode assembly 300 from the winding needle body 11.

[0126] When the outer needle 112 is formed by splicing a plurality of sub-needle bodies 1123 , the feed groove 1122 may be provided on one or more sub-needle bodies 1123 ; for example, the outer needle 112 is formed by splicing two sub-needle bodies 1123 , and the two sub-needle bodies 1123 are both provided with a feed groove 1122 .

[0127] In the case where the winding needle body 11 includes only one main structure, one or more material discharge grooves 1122 may be provided on the main structure.

[0128] In this embodiment, a material unloading groove 1122 is provided on the winding needle body 11 , so that the unloading equipment can extend into the wound electrode assembly 300 and remove the electrode assembly 300 from the winding needle 10 .

[0129] In some embodiments, the winding needle 10 includes a winding needle body 11 and a fixing assembly, the winding needle body 11 includes an inner needle 111 and an outer needle 112 sleeved on the inner needle 111, the outer needle 112 includes two opposite and spaced sub-needle bodies 1123, the two sub-needle bodies 1123 are spaced along the circumference of the inner needle 111, and a receiving groove 1121 is formed between the two sub-needle bodies 1123; the side walls of the receiving groove 1121 are respectively the outer wall surfaces of the two sub-needle bodies 1123, and the bottom wall of the receiving groove 1121 is the outer wall surface of the inner needle 111.

[0130] The sub-needle body 1123 is provided with a material discharge slot 1122 to facilitate the material discharge device to remove the wound electrode assembly 300 from the winding needle body 11 .

[0131] The fixing assembly includes three air bags 12 disposed in the receiving groove 1121 . The three air bags 12 are disposed on the same side wall of the receiving groove 1121 , and the three air bags 12 are evenly spaced.

[0132] When the winding needle 10 winds the intermediate structure, the three airbags 12 can expand after being filled with fluid and press the intermediate structure in the accommodating groove 1121 against the side wall of the accommodating groove 1121 to fix the intermediate structure to the winding needle body 11; after the winding is completed, the airbags 12 are deflated and detached from the electrode assembly 300, so that the wound electrode assembly 300 can be removed from the winding needle body 11.

[0133] refer to Fig. 9 In a second aspect, some embodiments of the present application provide a winding device 1000, comprising a winding needle 10 provided by some embodiments of the first aspect.

[0134] The winding device 1000 also includes a feeding assembly 100 and a winding assembly 200; wherein the feeding assembly 100 is used to provide an intermediate structure of the electrode assembly 300; the winding assembly 200 is arranged downstream of the feeding assembly 100 and is used to wind the intermediate structure, and the winding assembly 200 includes a base 20 and at least two winding needles 10 arranged on the base 20, and the base 20 is used to drive different winding needles 10 to move alternately to one side of the feeding assembly 100 in sequence.

[0135] The feeding assembly 100 refers to a structure in the winding device 1000 for providing an intermediate structure of the electrode assembly 300. The intermediate structure is a structural component before the electrode assembly 300 is processed. The intermediate structure may include a pole piece and a diaphragm 70. The pole piece and the diaphragm 70 may be compounded, in which case the intermediate structure is a structure after the pole piece and the diaphragm 70 are compounded. The pole piece and the diaphragm 70 may not be compounded, in which case the intermediate structure includes the pole piece and the diaphragm 70. The feeding assembly 100 provides an intermediate structure. The feeding assembly 100 may include an unwinding structure, a compound structure or other structures.

[0136] The winding assembly 200 refers to a structure used for winding the intermediate structure in the winding device 1000. The composite structure formed by the electrode sheet and the diaphragm 70 can form a wound electrode assembly 300 after winding. The electrode sheet and the diaphragm 70 can also be compounded and wound at the winding assembly 200 to form a wound electrode assembly 300. The winding assembly 200 may include a winding needle 10 for winding the electrode sheet and the diaphragm 70. The winding assembly 200 may also include a pressing structure, a gluing structure, a material unloading structure, etc.

[0137] The base 20 refers to a structure in the winding assembly 200 that provides a fixed foundation for the winding needle 10 or other structures. The shape of the base 20 can be circular, square or other shapes; the material of the base 20 can include metal, plastic or other shapes.

[0138] The winding needle 10 is disposed on the base 20 and can rotate relative to the base 20 to facilitate winding of the intermediate structure; at least two winding needles 10 are provided, and for example, there can be two winding needles 10, or there can be three or more winding needles 10.

[0139] The base 20 can drive the winding needle 10 to move, and drive different winding needles 10 to move alternately in sequence on one side of the feeding component 100, so that when one winding needle 10 is located on one side of the feeding component 100, the other winding needle 10 can be located at other positions to facilitate finishing or other processing procedures. This arrangement enables other processes such as finishing of the intermediate structure to be performed at other positions different from the feeding component 100 without occupying the space on one side of the feeding component 100, thereby freeing up the space on the other side of the feeding component 100 so that another vacant winding needle 10 can move to one side of the feeding component 100 and wind the intermediate structure.

[0140] It can be understood that, under the premise that the winding assembly 200 is located downstream of the feeding assembly 100, the base 20 can drive the winding needle 10 to be located on either side of the feeding assembly 100. For example, refer to Fig. 9 ,by Fig. 9 From top to bottom in the figure is the direction from upstream to downstream, and the winding needle 10 can be located at the lower right side of the composite component, or at the upper left side, right side or other positions of the composite component.

[0141] For example, two winding needles 10 are provided on the base 20. When one winding needle 10 is located beside the feeding component 100, the winding needle 10 can wind the intermediate structure. At this time, the other winding needle 10 is located at other positions to facilitate the finishing treatment or other processing procedures of the intermediate structure on the winding needle 10; when the winding needle 10 beside the feeding component 100 is completed, the intermediate structure on the winding needle 10 located at other positions is also processed and unloaded, that is, the winding needle 10 located at other positions is empty at this time; thereafter, the base 20 is moved to move the empty winding needle 10 to the side of the feeding component 100 and wind the intermediate structure, and the winding needle 10 that has finished winding moves to other positions to facilitate the finishing treatment or other processing procedures; that is, the winding needle 10 is present beside the feeding component 100 most of the time, and the winding needle 10 is absent only when the winding needle 10 moves alternately.

[0142] Since there is a distance between the feeding component 100 and the winding needle 10, continuous feeding of the feeding component 100 can be achieved by controlling the distance; that is, after a winding needle 10 finishes winding, the feeding component 100 feeds and causes the intermediate structure to move in the distance between the feeding component 100 and the winding needle 10, and before the intermediate structure moves to the position of the winding needle 10, the idle winding needle 10 can move to one side of the feeding component 100 and take over the intermediate structure.

[0143] In this embodiment, the winding device 1000 includes a feeding component 100 and a winding component 200, and the base 20 of the winding component 200 can drive the winding needle 10 to move alternately to one side of the feeding component 100 in sequence, so that the feeding component 100 can continuously provide the intermediate structure, and the winding needle 10 can move alternately to one side of the feeding component 100 and wind the intermediate structure, thereby improving the efficiency of the winding device 1000.

[0144] refer to Fig. 9 In some embodiments, the winding assembly 200 further includes a cutting structure 30 and a blowing structure 40 disposed on one side of the base 20 , the cutting structure 30 is used to cut the intermediate structure, and the blowing structure 40 is used to blow part of the intermediate structure into the receiving groove 1121 .

[0145] The cutting structure 30 refers to a structure in the winding device 1000 for cutting the intermediate structure. The cutting structure 30 may include a variety of cutting structures, such as a linear cutter that reciprocates along a straight line, a cam cutter that rotates around an axis, etc.; the cutting structure 30 may only include a cutting structure for cutting the cathode sheet 80 or the anode sheet 60, or only include a cutting structure for cutting the diaphragm 70, or may simultaneously include a cutting structure 30 for cutting the electrode sheet and a cutting structure for cutting the diaphragm 70.

[0146] The blowing structure 40 refers to a structure in the winding device 1000 used to blow part of the cut intermediate structure into the receiving groove 1121. After the intermediate structure is cut off by the cutting structure 30, the blowing structure 40 can blow one end of the intermediate structure into the receiving groove 1121 through airflow to facilitate the fixation of the fixed component; the blowing structure 40 can include a variety of structures, for example, the blowing structure 40 can include a blower, a fan, an air compressor or other structures that can generate airflow.

[0147] The cutting structure 30 and the blowing structure 40 are both located on one side of the base 20 to facilitate the winding of the intermediate structure by the winding needle 10 on the base 20. For example, after a winding needle 10 is wound, the base 20 drives the winding needle 10 to move and moves an empty winding needle 10 to the side of the feeding component 100, while the feeding component 100 continues to feed, and at the same time, the wound winding needle 10 pulls the intermediate structure to a position away from the feeding component 100; at this time, the cutting structure 30 cuts off the intermediate structure between the feeding component 100 and the wound winding needle 10, and one end of the cut intermediate structure is the tail end of the wound electrode assembly 300 and is processed by the subsequent finishing process, and the other end of the cut intermediate structure can be blown into the receiving groove 1121 of the empty winding needle 10 by the blowing structure 40, so as to facilitate the fixing of the fixing component, thereby facilitating the control of the winding needle 10 to wind the intermediate structure provided by the feeding component 100.

[0148] In this embodiment, the winding assembly 200 includes a cutting structure 30 and a blowing structure 40. The electrode assembly 300 is cut by the cutting structure 30, and the cut electrode assembly 300 is blown into the mounting groove by the blowing structure 40, so that the airbag 12 is fixed into the middle structure of the mounting groove, which simplifies the process of the middle structure entering the winding needle 10 and the winding needle 10 clamping the middle structure.

[0149] refer to Fig. 9 In some embodiments, the winding assembly 200 also includes a first station 2001 and a second station 2002 located at different positions, and the first station 2001 is located on one side of the feeding assembly 100; the base 20 is used to drive the winding needle 10 to move from the first station 2001 to the second station 2002, and the cutting structure 30 and the blowing structure 40 are located between the first station 2001 and the second station 2002.

[0150] The first station 2001 and the second station 2002 are both spatial positions to which the winding needle 10 can move. When a winding needle 10 is located at the first station 2001, there can also be a winding needle 10 located at the second station 2002. The first station 2001 and the second station 2002 can be defined as positions in space, or can be surrounded by structural parts. It can be understood that in addition to the first station 2001 and the second station 2002, the winding assembly 200 can also include other stations for the winding needle 10 to move.

[0151] The first station 2001 is located on one side of the feeding assembly 100. When the winding needle 10 is located at the first station 2001, it can rotate and wind the intermediate structure; when the winding needle 10 is located at the second station 2002, the intermediate structure wound on the winding needle 10 can be finished, or other processing steps can be performed on the intermediate structure wound on the winding needle 10.

[0152] The cutting structure 30 and the blowing structure 40 are located between the first station 2001 and the second station 2002; the cutting structure 30 can cut the intermediate structure between the first station 2001 and the second station 2002, so that part of the intermediate structure can be wound on the winding needle 10 located on the second station 2002 as the tail end, and the other part of the intermediate structure can enter the receiving groove 1121 of the winding needle 10 located at the first station 2001 as the first section and be fixed in the receiving groove 1121 by the fixing component; the blowing structure 40 can blow part of the intermediate structure into the receiving groove 1121 of the winding needle 10 located at the first station 2001 after the cutting structure 30 cuts off the intermediate structure.

[0153] The base 20 can drive the winding needle 10 to move from the first station 2001 to the second station 2002, the base 20 can also drive the winding needle 10 to move from the second station 2002 to the first station 2001, and the base 20 can also drive the winding needle 10 to move to other positions.

[0154] When the winding of the winding needle 10 in the first station 2001 is completed, the base 20 can drive the winding needle 10 to move from the first station 2001 to the second station 2002. During this process, the feeding component 100 continues to provide the intermediate structure, and some of the intermediate structures that are not wound on the winding needle 10 will pass through the cutting structure 30 and the blowing structure 40; after the winding needle 10 moves to the second station 2002, there is another empty winding needle 10 in the first station 2001. At this time, the cutting structure 30 cuts off the intermediate structure next to it, and the blowing structure 40 blows part of the intermediate structure into the accommodating groove 1121 of the empty winding needle 10 in the first station 2001, so that the empty winding needle 10 can fix the part of the intermediate structure and start winding.

[0155] In this embodiment, the winding assembly 200 includes a first station 2001 and a second station 2002, so that the winding needle 10 located at the first station 2001 can play the role of winding the electrode assembly 300, and the winding needle 10 located at the second station 2002 can play the role of finishing. The finishing process is set at a position different from the winding position, so that when one winding needle 10 is in the finishing process, another winding needle 10 can perform the winding process, thereby further improving the production efficiency of the winding equipment 1000.

[0156] refer to Fig. 9 In some embodiments, the winding assembly 200 further includes a first displacement structure (not shown in the figure), which is used to drive the cutting structure 30 and the blowing structure 40 to move relative to the base 20 to avoid the winding needle 10.

[0157] The first displacement structure can drive the cutting structure 30 and the blowing structure 40 to move radially along the base 20, and can also drive the cutting structure 30 and the blowing structure 40 to move axially along the base 20; the first displacement structure can drive the cutting structure 30 and the blowing structure 40 to move at the same time, and can also drive the cutting structure 30 and the blowing structure 40 to move separately.

[0158] The first displacement structure can drive the cutting structure 30 and the blowing structure 40 to move relative to the base 20 in the same direction and in the same manner. The first displacement structure can also drive the cutting structure 30 and the blowing structure 40 to move relative to the base 20 in different directions and / or in different manners.

[0159] For example, the cutting structure 30 and the blowing structure 40 can be driven by a linear feeding structure to synchronously move along the radial direction of the base 20 to approach or move away from the base 20. The linear feeding mechanism can be a screw nut structure, a gear rack structure or other linear feeding structures.

[0160] For example, the cutting structure 30 and the blowing structure 40 can be driven to synchronously extend and retract along the axial direction of the base 20 by structures such as an air cylinder, a hydraulic cylinder, and an electric cylinder.

[0161] The cutting structure 30 and the blowing structure 40 can move toward or away from the base 20 in the radial direction of the base 20, that is, when the winding needle 10 moves from the first station 2001 to the second station 2002, the cutting structure 30 and the blowing structure 40 can move away from the base 20 in the radial direction of the base 20 to avoid the winding needle 10, and after the winding needle 10 moves to the second station 2002, the cutting structure 30 and the blowing structure 40 can also return to the original position to cut and blow the intermediate structure; the cutting structure 30 and the blowing structure 40 It can also be extended and retracted along the axial direction of the base 20, that is, in the process of the winding needle 10 moving from the first station 2001 to the second station 2002, the cutting structure 30 and the blowing structure 40 can be contracted along the axial direction of the base 20 to avoid the winding needle 10, and after the winding needle 10 moves to the second station 2002, the cutting structure 30 and the blowing structure 40 can also return to their original positions to cut and blow the intermediate structure; it can be understood that the cutting structure 30 and the blowing structure 40 can also have other movement methods to avoid the winding needle 10.

[0162] Because the cutting structure 30 and the blowing structure 40 are located between the first station 2001 and the second station 2002, and the winding needle 10 may pass over the cutting structure 30 and the blowing structure 40 when moving from the first station 2001 to the second station 2002, the cutting structure 30 and the blowing structure 40 may easily interfere with the movement of the winding needle 10, such as causing collision between the structures; enabling the cutting structure 30 and the blowing structure 40 to move relative to the base 20 can enable the cutting structure 30 and the blowing structure 40 to avoid the winding needle 10 when the winding needle 10 moves from the first station 2001 to the second station 2002, thereby reducing the interference of the cutting structure 30 and the blowing structure 40 on the movement of the winding needle 10.

[0163] refer to Fig. 9 In some embodiments, the winding assembly 200 further includes a third station 2003; the winding assembly 200 includes at least three winding needles 10, and the base 20 can drive the three winding needles 10 to be located at the first station 2001, the second station 2002 and the third station 2003 respectively.

[0164] Similar to the first station 2001, the third station 2003 is also a spatial position to which the winding needle 10 can move. When a winding needle 10 is located at the first station 2001, there can also be a winding needle 10 located at the second station 2002, and there can also be a winding needle 10 located at the third station 2003; the third station 2003 can be defined as a position in space, or it can be surrounded by structural parts; it can be understood that in addition to the first station 2001, the second station 2002 and the third station 2003, the winding assembly 200 can also include other stations for the winding needle 10 to move.

[0165] When the winding needle 10 is located at the third station 2003, the intermediate structure wound on the winding needle 10 can be unloaded or subjected to other processing steps; the winding needle 10 in the third station 2003 can move from the third station 2003 to the first station 2001.

[0166] For example, a material unloading device is provided beside the third workstation 2003. When the winding needle 10 is located at the third workstation 2003, the electrode assembly 300 wound on the winding needle 10 has been wound, and the material unloading device can remove the electrode assembly 300 on the winding needle 10 and leave the winding needle 10 empty.

[0167] For example, the base 20 can drive the winding needle 10 to move along a circular trajectory, that is, the first station 2001, the second station 2002 and the third station 2003 are all arranged along the circular trajectory. The base 20 can drive the winding needle 10 to move to the first station 2001, the second station 2002 and the third station 2003 in sequence. At the same time, the base 20 can also drive the winding needle 10 to move from the third station 2003 to the first station 2001.

[0168] In this embodiment, the winding assembly 200 includes a third station 2003, and the unloading device is capable of removing the electrode assembly 300 from the winding needle 10 at the third station 2003. At the same time, when a winding needle 10 is located at the third station 2003, there are winding needles 10 at both the first station 2001 and the second station 2002, so as to reduce the mutual influence of each process and further improve the production efficiency of the winding equipment 1000.

[0169] refer to Fig. 9 In some embodiments, the winding assembly 200 further includes a holding structure 50 , which is located on one side of the feeding assembly 100 , and is used to hold the intermediate structure against the winding needle 10 .

[0170] The pressing structure 50 refers to the structure in the winding assembly 200 used to press the intermediate structure on the winding needle 10. The pressing structure 50 can be a pressing roller, or a pressing block or other structures; the shape of the pressing structure 50 can be a flat plate, or a cylindrical shape or other shapes; the pressing structure 50 can move synchronously with the movement of the intermediate structure, and the pressing structure 50 can also be a fixed structure.

[0171] For example, the pressing structure 50 is a pressing roller, and the pressing roller is an active roller. The pressing roller can move synchronously with the movement of the intermediate structure to reduce the friction between the pressing roller and the intermediate structure, thereby reducing damage to the intermediate structure.

[0172] The holding structure 50 is arranged on one side of the feeding component 100 to hold the intermediate structure on the winding needle 10 on one side of the feeding component 100. The holding structure 50 can make the intermediate structure fit better on the adjacent winding needle 10. After the cutting structure 30 cuts off the intermediate structure, there is a lack of force to tension the intermediate structure on the intermediate structure on one side of the feeding component 100, which can easily cause the intermediate structure to separate from the winding needle 10. The holding structure 50 can provide tensioning force for the intermediate structure on one side of the feeding component 100, thereby reducing the separation of the intermediate structure from the winding needle 10.

[0173] At the same time, in the process of the winding needle 10 winding the intermediate structure, the holding structure 50 can also make the intermediate structure fit better with the winding needle 10, thereby reducing the gap between the pole piece and the diaphragm 70, and between the diaphragms 70 in the intermediate structure.

[0174] In this embodiment, the winding assembly 200 also includes a pressing structure 50, so as to press the electrode assembly 300 onto the winding needle 10 through the pressing structure 50 to reduce the gap between the electrode assembly 300 and the winding needle 10, thereby reducing the gap between the electrode sheet and the diaphragm 70, and between the diaphragms 70 in the wound electrode assembly 300.

[0175] refer to Fig. 9 In some embodiments, the winding assembly 200 further includes a second displacement structure (not shown in the figure), which is used to drive the holding structure 50 to move relative to the base 20 to avoid the winding needle 10.

[0176] The second displacement structure can drive the pressing structure 50 to move along the radial direction of the base 20 , and can also drive the pressing structure 50 to move along the axial direction of the base 20 .

[0177] For example, the holding structure 50 can be driven by a linear feed structure to move radially along the base 20 to approach or move away from the base 20 . The linear feed mechanism can be a screw nut structure, a gear rack structure or other linear feed structures.

[0178] For example, the holding structure 50 can be driven to extend and retract along the axial direction of the base 20 by a cylinder, a hydraulic cylinder, an electric cylinder or the like.

[0179] The pressing structure 50 can move closer to or away from the base 20 along the radial direction of the base 20, that is, in the process of the winding needle 10 moving from the first station 2001 to the second station 2002, the pressing structure 50 can move away from the base 20 along the radial direction of the base 20 to avoid the winding needle 10, and after the winding needle 10 moves to the second station 2002, the pressing structure 50 can also return to its original position to press the intermediate structure on the winding needle 10; the pressing structure 50 can also retract along the axial direction of the base 20, that is, in the process of the winding needle 10 moving from the first station 2001 to the second station 2002, the pressing structure 50 can shrink along the axial direction of the base 20 to avoid the winding needle 10, and after the winding needle 10 moves to the second station 2002, the pressing structure 50 can also return to its original position; it can be understood that the pressing structure 50 can also have other movement methods to avoid the winding needle 10.

[0180] Because the holding structure 50 is located on one side of the feeding assembly 100 and is used to hold the intermediate structure against the winding needle 10 in the first station 2001, the winding needle 10 may pass over the holding structure 50 during the process of moving from the first station 2001 to the second station 2002. At this time, the holding structure 50 is likely to interfere with the movement of the winding needle 10, such as causing collisions between structures. Enabling the holding structure 50 to move relative to the base 20 can enable the holding structure 50 to avoid the winding needle 10 during the process of the winding needle 10 moving from the first station 2001 to the second station 2002, thereby reducing the interference of the holding structure 50 with the movement of the winding needle 10.

[0181] In some embodiments, the winding device 1000 includes a supply assembly 100 and a winding assembly 200, wherein the supply assembly 100 is used to provide the intermediate structure of the electrode assembly 300 to the winding assembly 200, and the intermediate structure includes an anode sheet 60, a separator 70, a cathode sheet 80 and another separator 70 arranged in sequence.

[0182] The winding assembly 200 includes a base 20, on which three winding needles 10 are provided along a circular trajectory. The winding assembly 200 also includes a first station 2001, a second station 2002 and a third station 2003 which are arranged in sequence along the circular trajectory, wherein the first station 2001 is located on one side of the feeding assembly 100. When one winding needle 10 is located in the first station 2001, the other two winding needles 10 can be located in the second station 2002 and the third station 2003 respectively.

[0183] The winding assembly 200 further includes a holding structure 50 disposed on one side of the first station 2001 . The winding assembly 200 further includes a cutting structure 30 and a blowing structure 40 disposed between the first station 2001 and the second station 2002 .

[0184] When a winding needle 10 is located in the first station 2001, the blowing structure 40 blows one end of the intermediate structure provided by the feeding component 100 into the receiving groove 1121 of the winding needle 10, and fixes one end of the intermediate structure to the winding needle 10 through the fixing component, and then the winding needle 10 rotates and winds the intermediate structure on the winding needle 10; after the winding is completed, the pressing structure 50, the cutting structure 30, and the blowing structure 40 move to avoid the winding needle 10, and the base 20 drives the wound winding needle 10 to move from the first station 2001 to the second station 2002, and at the same time, the base 20 also drives an empty winding needle 10 to move to the first station 2001; when the wound winding needle 10 moves to the second station 2002, the pressing structure 50, the cutting structure 30, and the blowing structure 40 return to their positions, and the pressing structure 50 presses the intermediate structure at the feeding component 100 in the first station 2001. The winding needle 10, the cutting structure 30 cuts off the intermediate structure beside it, one end of the cut intermediate structure is wound onto the winding needle 10 in the second station 2002, and the other end of the cut intermediate structure is blown into the receiving groove 1121 of the winding needle 10 in the first station 2001 by the blowing structure 40, so that the winding in the first station 2001 continues to wind the intermediate structure, and the intermediate structure in the second station 2002 is finished; after the winding of the winding needle 10 in the first station 2001 is completed, the finishing work of the second station 2002 is also completed. At this time, the holding structure 50, the cutting structure 30, and the blowing structure 40 move to avoid the winding needle 10, and the base 20 drives the wound winding needle 10 to move from the second station 2002 to the third station 2003; thereafter, the electrode assembly 300 wound on the winding needle 10 in the third station 2003 is removed and an empty winding needle 10 is obtained.

[0185] 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 needle for winding an electrode assembly, characterized in that: The winding needle comprises: A winding needle body, wherein a receiving groove is provided on the winding needle body; A fixing assembly, contained in the containing groove, and used to fix a part of the electrode assembly in the winding needle body; In the radial direction of the winding needle body, the depth of the accommodating groove is smaller than the diameter of the winding needle body.

2. The winding needle according to claim 1, characterized in that: The fixing assembly includes an air bag, which is used to fix part of the electrode assembly to the winding needle body after being filled with fluid.

3. The winding needle according to claim 2, characterized in that: The airbag is connected to the inner wall of the containing tank, and the airbag is used to press a portion of the electrode assembly against the inner wall on the other side of the containing tank after the fluid is filled into the airbag.

4. The winding needle according to claim 2, characterized in that: The number of the airbags is at least two, and at least two of the airbags are arranged relatively and spaced apart from each other. The two relatively arranged airbags are used to cooperate and clamp a portion of the electrode assembly after being filled with fluid.

5. The winding needle according to any one of claims 1 to 4, characterized in that: The needle winding body comprises an inner needle and an outer needle sleeved on the inner needle, and the accommodating groove is formed on the outer needle.

6. The winding needle according to claim 5, characterized in that: The outer needle comprises two sub-needle bodies which are opposite to each other and spaced apart from each other. Both of the sub-needle bodies are detachably connected to the inner needle, and the accommodating groove is formed between the two sub-needle bodies.

7. The winding needle according to any one of claims 1 to 6, characterized in that: A material discharge groove is also provided on the peripheral side of the winding needle body; In the axial direction of the winding needle body, at least one end of the material discharge groove is communicated with the space outside the winding needle body.

8. A winding device, characterized in that: The winding device comprises: A feeding assembly, used for providing an intermediate structure of the electrode assembly; A winding assembly is arranged downstream of the feeding assembly and is used to wind the intermediate structure. The winding assembly includes a base and at least two winding needles as described in any one of claims 1 to 7 arranged on the base. The base is used to drive different winding needles to move alternately to one side of the feeding assembly in sequence.

9. The winding device according to claim 8, characterized in that The winding assembly further comprises a cutting structure and an air blowing structure arranged on one side of the base, wherein the cutting structure is used to cut off the intermediate structure, and the air blowing structure is used to blow part of the intermediate structure into the containing groove.

10. The winding device according to claim 9, characterized in that The winding assembly further comprises a first station and a second station located at different positions, and the first station is located at one side of the feeding assembly; The base is used to drive the winding needle to move from the first station to the second station, and the cutting structure and the blowing structure are located between the first station and the second station.

11. The winding device according to claim 10, characterized in that The winding assembly further comprises a first displacement structure, and the first displacement structure is used to drive the cutting structure and the blowing structure to move relative to the base to avoid the winding needle.

12. The winding device according to claim 10, characterized in that The winding assembly also includes a third station; The winding assembly includes at least three winding needles, and the base can drive the three winding needles to be located at the first station, the second station and the third station respectively.

13. The winding device according to claim 8, characterized in that The winding assembly further comprises a pressing structure, which is located at one side of the feeding assembly and is used to press the intermediate structure against the winding needle.

14. The winding device according to claim 13, characterized in that The winding assembly also includes a second displacement structure, which is used to drive the holding structure to move relative to the base to avoid the winding needle.

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